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Openwrt/target/linux/generic-2.6/patches-2.6.23/300-add-mmc-spi-driver.patch
Gabor Juhos 5d67fbe1b7 generic-2.6/2.6.23: refresh patches 
SVN-Revision: 14448
2009-02-08 19:11:53 +00:00

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This is a port of the MMC-SPI driver from 2.6.24.3
--mb
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -100,3 +100,16 @@ config MMC_TIFM_SD
To compile this driver as a module, choose M here: the
module will be called tifm_sd.
+config MMC_SPI
+ tristate "MMC/SD over SPI (EXPERIMENTAL)"
+ depends on MMC && SPI_MASTER && !HIGHMEM && EXPERIMENTAL
+ select CRC7
+ select CRC_ITU_T
+ help
+ Some systems accss MMC/SD cards using a SPI controller instead of
+ using a "native" MMC/SD controller. This has a disadvantage of
+ being relatively high overhead, but a compensating advantage of
+ working on many systems without dedicated MMC/SD controllers.
+
+ If unsure, or if your system has no SPI master driver, say N.
+
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -15,4 +15,5 @@ obj-$(CONFIG_MMC_AU1X) += au1xmmc.o
obj-$(CONFIG_MMC_OMAP) += omap.o
obj-$(CONFIG_MMC_AT91) += at91_mci.o
obj-$(CONFIG_MMC_TIFM_SD) += tifm_sd.o
+obj-$(CONFIG_MMC_SPI) += mmc_spi.o
--- /dev/null
+++ b/drivers/mmc/host/mmc_spi.c
@@ -0,0 +1,1419 @@
+/*
+ * mmc_spi.c - Access SD/MMC cards through SPI master controllers
+ *
+ * (C) Copyright 2005, Intec Automation,
+ * Mike Lavender (mike@steroidmicros)
+ * (C) Copyright 2006-2007, David Brownell
+ * (C) Copyright 2007, Axis Communications,
+ * Hans-Peter Nilsson (hp@axis.com)
+ * (C) Copyright 2007, ATRON electronic GmbH,
+ * Jan Nikitenko <jan.nikitenko@gmail.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/hrtimer.h>
+#include <linux/delay.h>
+#include <linux/bio.h>
+#include <linux/dma-mapping.h>
+#include <linux/crc7.h>
+#include <linux/crc-itu-t.h>
+#include <linux/scatterlist.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/mmc.h> /* for R1_SPI_* bit values */
+
+#include <linux/spi/spi.h>
+#include <linux/spi/mmc_spi.h>
+
+#include <asm/unaligned.h>
+
+
+#define sg_page(sg) (sg)->page
+
+
+/* NOTES:
+ *
+ * - For now, we won't try to interoperate with a real mmc/sd/sdio
+ * controller, although some of them do have hardware support for
+ * SPI protocol. The main reason for such configs would be mmc-ish
+ * cards like DataFlash, which don't support that "native" protocol.
+ *
+ * We don't have a "DataFlash/MMC/SD/SDIO card slot" abstraction to
+ * switch between driver stacks, and in any case if "native" mode
+ * is available, it will be faster and hence preferable.
+ *
+ * - MMC depends on a different chipselect management policy than the
+ * SPI interface currently supports for shared bus segments: it needs
+ * to issue multiple spi_message requests with the chipselect active,
+ * using the results of one message to decide the next one to issue.
+ *
+ * Pending updates to the programming interface, this driver expects
+ * that it not share the bus with other drivers (precluding conflicts).
+ *
+ * - We tell the controller to keep the chipselect active from the
+ * beginning of an mmc_host_ops.request until the end. So beware
+ * of SPI controller drivers that mis-handle the cs_change flag!
+ *
+ * However, many cards seem OK with chipselect flapping up/down
+ * during that time ... at least on unshared bus segments.
+ */
+
+
+/*
+ * Local protocol constants, internal to data block protocols.
+ */
+
+/* Response tokens used to ack each block written: */
+#define SPI_MMC_RESPONSE_CODE(x) ((x) & 0x1f)
+#define SPI_RESPONSE_ACCEPTED ((2 << 1)|1)
+#define SPI_RESPONSE_CRC_ERR ((5 << 1)|1)
+#define SPI_RESPONSE_WRITE_ERR ((6 << 1)|1)
+
+/* Read and write blocks start with these tokens and end with crc;
+ * on error, read tokens act like a subset of R2_SPI_* values.
+ */
+#define SPI_TOKEN_SINGLE 0xfe /* single block r/w, multiblock read */
+#define SPI_TOKEN_MULTI_WRITE 0xfc /* multiblock write */
+#define SPI_TOKEN_STOP_TRAN 0xfd /* terminate multiblock write */
+
+#define MMC_SPI_BLOCKSIZE 512
+
+
+/* These fixed timeouts come from the latest SD specs, which say to ignore
+ * the CSD values. The R1B value is for card erase (e.g. the "I forgot the
+ * card's password" scenario); it's mostly applied to STOP_TRANSMISSION after
+ * reads which takes nowhere near that long. Older cards may be able to use
+ * shorter timeouts ... but why bother?
+ */
+#define readblock_timeout ktime_set(0, 100 * 1000 * 1000)
+#define writeblock_timeout ktime_set(0, 250 * 1000 * 1000)
+#define r1b_timeout ktime_set(3, 0)
+
+
+/****************************************************************************/
+
+/*
+ * Local Data Structures
+ */
+
+/* "scratch" is per-{command,block} data exchanged with the card */
+struct scratch {
+ u8 status[29];
+ u8 data_token;
+ __be16 crc_val;
+};
+
+struct mmc_spi_host {
+ struct mmc_host *mmc;
+ struct spi_device *spi;
+
+ unsigned char power_mode;
+ u16 powerup_msecs;
+
+ struct mmc_spi_platform_data *pdata;
+
+ /* for bulk data transfers */
+ struct spi_transfer token, t, crc, early_status;
+ struct spi_message m;
+
+ /* for status readback */
+ struct spi_transfer status;
+ struct spi_message readback;
+
+ /* underlying DMA-aware controller, or null */
+ struct device *dma_dev;
+
+ /* buffer used for commands and for message "overhead" */
+ struct scratch *data;
+ dma_addr_t data_dma;
+
+ /* Specs say to write ones most of the time, even when the card
+ * has no need to read its input data; and many cards won't care.
+ * This is our source of those ones.
+ */
+ void *ones;
+ dma_addr_t ones_dma;
+};
+
+
+/****************************************************************************/
+
+/*
+ * MMC-over-SPI protocol glue, used by the MMC stack interface
+ */
+
+static inline int mmc_cs_off(struct mmc_spi_host *host)
+{
+ /* chipselect will always be inactive after setup() */
+ return spi_setup(host->spi);
+}
+
+static int
+mmc_spi_readbytes(struct mmc_spi_host *host, unsigned len)
+{
+ int status;
+
+ if (len > sizeof(*host->data)) {
+ WARN_ON(1);
+ return -EIO;
+ }
+
+ host->status.len = len;
+
+ if (host->dma_dev)
+ dma_sync_single_for_device(host->dma_dev,
+ host->data_dma, sizeof(*host->data),
+ DMA_FROM_DEVICE);
+
+ status = spi_sync(host->spi, &host->readback);
+
+ if (host->dma_dev)
+ dma_sync_single_for_cpu(host->dma_dev,
+ host->data_dma, sizeof(*host->data),
+ DMA_FROM_DEVICE);
+
+ return status;
+}
+
+static int
+mmc_spi_skip(struct mmc_spi_host *host, ktime_t timeout, unsigned n, u8 byte)
+{
+ u8 *cp = host->data->status;
+
+ timeout = ktime_add(timeout, ktime_get());
+
+ while (1) {
+ int status;
+ unsigned i;
+
+ status = mmc_spi_readbytes(host, n);
+ if (status < 0)
+ return status;
+
+ for (i = 0; i < n; i++) {
+ if (cp[i] != byte)
+ return cp[i];
+ }
+
+ /* REVISIT investigate msleep() to avoid busy-wait I/O
+ * in at least some cases.
+ */
+ if (ktime_to_ns(ktime_sub(ktime_get(), timeout)) > 0)
+ break;
+ }
+ return -ETIMEDOUT;
+}
+
+static inline int
+mmc_spi_wait_unbusy(struct mmc_spi_host *host, ktime_t timeout)
+{
+ return mmc_spi_skip(host, timeout, sizeof(host->data->status), 0);
+}
+
+static int mmc_spi_readtoken(struct mmc_spi_host *host)
+{
+ return mmc_spi_skip(host, readblock_timeout, 1, 0xff);
+}
+
+
+/*
+ * Note that for SPI, cmd->resp[0] is not the same data as "native" protocol
+ * hosts return! The low byte holds R1_SPI bits. The next byte may hold
+ * R2_SPI bits ... for SEND_STATUS, or after data read errors.
+ *
+ * cmd->resp[1] holds any four-byte response, for R3 (READ_OCR) and on
+ * newer cards R7 (IF_COND).
+ */
+
+static char *maptype(struct mmc_command *cmd)
+{
+ switch (mmc_spi_resp_type(cmd)) {
+ case MMC_RSP_SPI_R1: return "R1";
+ case MMC_RSP_SPI_R1B: return "R1B";
+ case MMC_RSP_SPI_R2: return "R2/R5";
+ case MMC_RSP_SPI_R3: return "R3/R4/R7";
+ default: return "?";
+ }
+}
+
+/* return zero, else negative errno after setting cmd->error */
+static int mmc_spi_response_get(struct mmc_spi_host *host,
+ struct mmc_command *cmd, int cs_on)
+{
+ u8 *cp = host->data->status;
+ u8 *end = cp + host->t.len;
+ int value = 0;
+ char tag[32];
+
+ snprintf(tag, sizeof(tag), " ... CMD%d response SPI_%s",
+ cmd->opcode, maptype(cmd));
+
+ /* Except for data block reads, the whole response will already
+ * be stored in the scratch buffer. It's somewhere after the
+ * command and the first byte we read after it. We ignore that
+ * first byte. After STOP_TRANSMISSION command it may include
+ * two data bits, but otherwise it's all ones.
+ */
+ cp += 8;
+ while (cp < end && *cp == 0xff)
+ cp++;
+
+ /* Data block reads (R1 response types) may need more data... */
+ if (cp == end) {
+ unsigned i;
+
+ cp = host->data->status;
+
+ /* Card sends N(CR) (== 1..8) bytes of all-ones then one
+ * status byte ... and we already scanned 2 bytes.
+ *
+ * REVISIT block read paths use nasty byte-at-a-time I/O
+ * so it can always DMA directly into the target buffer.
+ * It'd probably be better to memcpy() the first chunk and
+ * avoid extra i/o calls...
+ */
+ for (i = 2; i < 9; i++) {
+ value = mmc_spi_readbytes(host, 1);
+ if (value < 0)
+ goto done;
+ if (*cp != 0xff)
+ goto checkstatus;
+ }
+ value = -ETIMEDOUT;
+ goto done;
+ }
+
+checkstatus:
+ if (*cp & 0x80) {
+ dev_dbg(&host->spi->dev, "%s: INVALID RESPONSE, %02x\n",
+ tag, *cp);
+ value = -EBADR;
+ goto done;
+ }
+
+ cmd->resp[0] = *cp++;
+ cmd->error = 0;
+
+ /* Status byte: the entire seven-bit R1 response. */
+ if (cmd->resp[0] != 0) {
+ if ((R1_SPI_PARAMETER | R1_SPI_ADDRESS
+ | R1_SPI_ILLEGAL_COMMAND)
+ & cmd->resp[0])
+ value = -EINVAL;
+ else if (R1_SPI_COM_CRC & cmd->resp[0])
+ value = -EILSEQ;
+ else if ((R1_SPI_ERASE_SEQ | R1_SPI_ERASE_RESET)
+ & cmd->resp[0])
+ value = -EIO;
+ /* else R1_SPI_IDLE, "it's resetting" */
+ }
+
+ switch (mmc_spi_resp_type(cmd)) {
+
+ /* SPI R1B == R1 + busy; STOP_TRANSMISSION (for multiblock reads)
+ * and less-common stuff like various erase operations.
+ */
+ case MMC_RSP_SPI_R1B:
+ /* maybe we read all the busy tokens already */
+ while (cp < end && *cp == 0)
+ cp++;
+ if (cp == end)
+ mmc_spi_wait_unbusy(host, r1b_timeout);
+ break;
+
+ /* SPI R2 == R1 + second status byte; SEND_STATUS
+ * SPI R5 == R1 + data byte; IO_RW_DIRECT
+ */
+ case MMC_RSP_SPI_R2:
+ cmd->resp[0] |= *cp << 8;
+ break;
+
+ /* SPI R3, R4, or R7 == R1 + 4 bytes */
+ case MMC_RSP_SPI_R3:
+ cmd->resp[1] = be32_to_cpu(get_unaligned((u32 *)cp));
+ break;
+
+ /* SPI R1 == just one status byte */
+ case MMC_RSP_SPI_R1:
+ break;
+
+ default:
+ dev_dbg(&host->spi->dev, "bad response type %04x\n",
+ mmc_spi_resp_type(cmd));
+ if (value >= 0)
+ value = -EINVAL;
+ goto done;
+ }
+
+ if (value < 0)
+ dev_dbg(&host->spi->dev, "%s: resp %04x %08x\n",
+ tag, cmd->resp[0], cmd->resp[1]);
+
+ /* disable chipselect on errors and some success cases */
+ if (value >= 0 && cs_on)
+ return value;
+done:
+ if (value < 0)
+ cmd->error = value;
+ mmc_cs_off(host);
+ return value;
+}
+
+/* Issue command and read its response.
+ * Returns zero on success, negative for error.
+ *
+ * On error, caller must cope with mmc core retry mechanism. That
+ * means immediate low-level resubmit, which affects the bus lock...
+ */
+static int
+mmc_spi_command_send(struct mmc_spi_host *host,
+ struct mmc_request *mrq,
+ struct mmc_command *cmd, int cs_on)
+{
+ struct scratch *data = host->data;
+ u8 *cp = data->status;
+ u32 arg = cmd->arg;
+ int status;
+ struct spi_transfer *t;
+
+ /* We can handle most commands (except block reads) in one full
+ * duplex I/O operation before either starting the next transfer
+ * (data block or command) or else deselecting the card.
+ *
+ * First, write 7 bytes:
+ * - an all-ones byte to ensure the card is ready
+ * - opcode byte (plus start and transmission bits)
+ * - four bytes of big-endian argument
+ * - crc7 (plus end bit) ... always computed, it's cheap
+ *
+ * We init the whole buffer to all-ones, which is what we need
+ * to write while we're reading (later) response data.
+ */
+ memset(cp++, 0xff, sizeof(data->status));
+
+ *cp++ = 0x40 | cmd->opcode;
+ *cp++ = (u8)(arg >> 24);
+ *cp++ = (u8)(arg >> 16);
+ *cp++ = (u8)(arg >> 8);
+ *cp++ = (u8)arg;
+ *cp++ = (crc7(0, &data->status[1], 5) << 1) | 0x01;
+
+ /* Then, read up to 13 bytes (while writing all-ones):
+ * - N(CR) (== 1..8) bytes of all-ones
+ * - status byte (for all response types)
+ * - the rest of the response, either:
+ * + nothing, for R1 or R1B responses
+ * + second status byte, for R2 responses
+ * + four data bytes, for R3 and R7 responses
+ *
+ * Finally, read some more bytes ... in the nice cases we know in
+ * advance how many, and reading 1 more is always OK:
+ * - N(EC) (== 0..N) bytes of all-ones, before deselect/finish
+ * - N(RC) (== 1..N) bytes of all-ones, before next command
+ * - N(WR) (== 1..N) bytes of all-ones, before data write
+ *
+ * So in those cases one full duplex I/O of at most 21 bytes will
+ * handle the whole command, leaving the card ready to receive a
+ * data block or new command. We do that whenever we can, shaving
+ * CPU and IRQ costs (especially when using DMA or FIFOs).
+ *
+ * There are two other cases, where it's not generally practical
+ * to rely on a single I/O:
+ *
+ * - R1B responses need at least N(EC) bytes of all-zeroes.
+ *
+ * In this case we can *try* to fit it into one I/O, then
+ * maybe read more data later.
+ *
+ * - Data block reads are more troublesome, since a variable
+ * number of padding bytes precede the token and data.
+ * + N(CX) (== 0..8) bytes of all-ones, before CSD or CID
+ * + N(AC) (== 1..many) bytes of all-ones
+ *
+ * In this case we currently only have minimal speedups here:
+ * when N(CR) == 1 we can avoid I/O in response_get().
+ */
+ if (cs_on && (mrq->data->flags & MMC_DATA_READ)) {
+ cp += 2; /* min(N(CR)) + status */
+ /* R1 */
+ } else {
+ cp += 10; /* max(N(CR)) + status + min(N(RC),N(WR)) */
+ if (cmd->flags & MMC_RSP_SPI_S2) /* R2/R5 */
+ cp++;
+ else if (cmd->flags & MMC_RSP_SPI_B4) /* R3/R4/R7 */
+ cp += 4;
+ else if (cmd->flags & MMC_RSP_BUSY) /* R1B */
+ cp = data->status + sizeof(data->status);
+ /* else: R1 (most commands) */
+ }
+
+ dev_dbg(&host->spi->dev, " mmc_spi: CMD%d, resp %s\n",
+ cmd->opcode, maptype(cmd));
+
+ /* send command, leaving chipselect active */
+ spi_message_init(&host->m);
+
+ t = &host->t;
+ memset(t, 0, sizeof(*t));
+ t->tx_buf = t->rx_buf = data->status;
+ t->tx_dma = t->rx_dma = host->data_dma;
+ t->len = cp - data->status;
+ t->cs_change = 1;
+ spi_message_add_tail(t, &host->m);
+
+ if (host->dma_dev) {
+ host->m.is_dma_mapped = 1;
+ dma_sync_single_for_device(host->dma_dev,
+ host->data_dma, sizeof(*host->data),
+ DMA_BIDIRECTIONAL);
+ }
+ status = spi_sync(host->spi, &host->m);
+
+ if (host->dma_dev)
+ dma_sync_single_for_cpu(host->dma_dev,
+ host->data_dma, sizeof(*host->data),
+ DMA_BIDIRECTIONAL);
+ if (status < 0) {
+ dev_dbg(&host->spi->dev, " ... write returned %d\n", status);
+ cmd->error = status;
+ return status;
+ }
+
+ /* after no-data commands and STOP_TRANSMISSION, chipselect off */
+ return mmc_spi_response_get(host, cmd, cs_on);
+}
+
+/* Build data message with up to four separate transfers. For TX, we
+ * start by writing the data token. And in most cases, we finish with
+ * a status transfer.
+ *
+ * We always provide TX data for data and CRC. The MMC/SD protocol
+ * requires us to write ones; but Linux defaults to writing zeroes;
+ * so we explicitly initialize it to all ones on RX paths.
+ *
+ * We also handle DMA mapping, so the underlying SPI controller does
+ * not need to (re)do it for each message.
+ */
+static void
+mmc_spi_setup_data_message(
+ struct mmc_spi_host *host,
+ int multiple,
+ enum dma_data_direction direction)
+{
+ struct spi_transfer *t;
+ struct scratch *scratch = host->data;
+ dma_addr_t dma = host->data_dma;
+
+ spi_message_init(&host->m);
+ if (dma)
+ host->m.is_dma_mapped = 1;
+
+ /* for reads, readblock() skips 0xff bytes before finding
+ * the token; for writes, this transfer issues that token.
+ */
+ if (direction == DMA_TO_DEVICE) {
+ t = &host->token;
+ memset(t, 0, sizeof(*t));
+ t->len = 1;
+ if (multiple)
+ scratch->data_token = SPI_TOKEN_MULTI_WRITE;
+ else
+ scratch->data_token = SPI_TOKEN_SINGLE;
+ t->tx_buf = &scratch->data_token;
+ if (dma)
+ t->tx_dma = dma + offsetof(struct scratch, data_token);
+ spi_message_add_tail(t, &host->m);
+ }
+
+ /* Body of transfer is buffer, then CRC ...
+ * either TX-only, or RX with TX-ones.
+ */
+ t = &host->t;
+ memset(t, 0, sizeof(*t));
+ t->tx_buf = host->ones;
+ t->tx_dma = host->ones_dma;
+ /* length and actual buffer info are written later */
+ spi_message_add_tail(t, &host->m);
+
+ t = &host->crc;
+ memset(t, 0, sizeof(*t));
+ t->len = 2;
+ if (direction == DMA_TO_DEVICE) {
+ /* the actual CRC may get written later */
+ t->tx_buf = &scratch->crc_val;
+ if (dma)
+ t->tx_dma = dma + offsetof(struct scratch, crc_val);
+ } else {
+ t->tx_buf = host->ones;
+ t->tx_dma = host->ones_dma;
+ t->rx_buf = &scratch->crc_val;
+ if (dma)
+ t->rx_dma = dma + offsetof(struct scratch, crc_val);
+ }
+ spi_message_add_tail(t, &host->m);
+
+ /*
+ * A single block read is followed by N(EC) [0+] all-ones bytes
+ * before deselect ... don't bother.
+ *
+ * Multiblock reads are followed by N(AC) [1+] all-ones bytes before
+ * the next block is read, or a STOP_TRANSMISSION is issued. We'll
+ * collect that single byte, so readblock() doesn't need to.
+ *
+ * For a write, the one-byte data response follows immediately, then
+ * come zero or more busy bytes, then N(WR) [1+] all-ones bytes.
+ * Then single block reads may deselect, and multiblock ones issue
+ * the next token (next data block, or STOP_TRAN). We can try to
+ * minimize I/O ops by using a single read to collect end-of-busy.
+ */
+ if (multiple || direction == DMA_TO_DEVICE) {
+ t = &host->early_status;
+ memset(t, 0, sizeof(*t));
+ t->len = (direction == DMA_TO_DEVICE)
+ ? sizeof(scratch->status)
+ : 1;
+ t->tx_buf = host->ones;
+ t->tx_dma = host->ones_dma;
+ t->rx_buf = scratch->status;
+ if (dma)
+ t->rx_dma = dma + offsetof(struct scratch, status);
+ t->cs_change = 1;
+ spi_message_add_tail(t, &host->m);
+ }
+}
+
+/*
+ * Write one block:
+ * - caller handled preceding N(WR) [1+] all-ones bytes
+ * - data block
+ * + token
+ * + data bytes
+ * + crc16
+ * - an all-ones byte ... card writes a data-response byte
+ * - followed by N(EC) [0+] all-ones bytes, card writes zero/'busy'
+ *
+ * Return negative errno, else success.
+ */
+static int
+mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t)
+{
+ struct spi_device *spi = host->spi;
+ int status, i;
+ struct scratch *scratch = host->data;
+
+ if (host->mmc->use_spi_crc)
+ scratch->crc_val = cpu_to_be16(
+ crc_itu_t(0, t->tx_buf, t->len));
+ if (host->dma_dev)
+ dma_sync_single_for_device(host->dma_dev,
+ host->data_dma, sizeof(*scratch),
+ DMA_BIDIRECTIONAL);
+
+ status = spi_sync(spi, &host->m);
+
+ if (status != 0) {
+ dev_dbg(&spi->dev, "write error (%d)\n", status);
+ return status;
+ }
+
+ if (host->dma_dev)
+ dma_sync_single_for_cpu(host->dma_dev,
+ host->data_dma, sizeof(*scratch),
+ DMA_BIDIRECTIONAL);
+
+ /*
+ * Get the transmission data-response reply. It must follow
+ * immediately after the data block we transferred. This reply
+ * doesn't necessarily tell whether the write operation succeeded;
+ * it just says if the transmission was ok and whether *earlier*
+ * writes succeeded; see the standard.
+ */
+ switch (SPI_MMC_RESPONSE_CODE(scratch->status[0])) {
+ case SPI_RESPONSE_ACCEPTED:
+ status = 0;
+ break;
+ case SPI_RESPONSE_CRC_ERR:
+ /* host shall then issue MMC_STOP_TRANSMISSION */
+ status = -EILSEQ;
+ break;
+ case SPI_RESPONSE_WRITE_ERR:
+ /* host shall then issue MMC_STOP_TRANSMISSION,
+ * and should MMC_SEND_STATUS to sort it out
+ */
+ status = -EIO;
+ break;
+ default:
+ status = -EPROTO;
+ break;
+ }
+ if (status != 0) {
+ dev_dbg(&spi->dev, "write error %02x (%d)\n",
+ scratch->status[0], status);
+ return status;
+ }
+
+ t->tx_buf += t->len;
+ if (host->dma_dev)
+ t->tx_dma += t->len;
+
+ /* Return when not busy. If we didn't collect that status yet,
+ * we'll need some more I/O.
+ */
+ for (i = 1; i < sizeof(scratch->status); i++) {
+ if (scratch->status[i] != 0)
+ return 0;
+ }
+ return mmc_spi_wait_unbusy(host, writeblock_timeout);
+}
+
+/*
+ * Read one block:
+ * - skip leading all-ones bytes ... either
+ * + N(AC) [1..f(clock,CSD)] usually, else
+ * + N(CX) [0..8] when reading CSD or CID
+ * - data block
+ * + token ... if error token, no data or crc
+ * + data bytes
+ * + crc16
+ *
+ * After single block reads, we're done; N(EC) [0+] all-ones bytes follow
+ * before dropping chipselect.
+ *
+ * For multiblock reads, caller either reads the next block or issues a
+ * STOP_TRANSMISSION command.
+ */
+static int
+mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t)
+{
+ struct spi_device *spi = host->spi;
+ int status;
+ struct scratch *scratch = host->data;
+
+ /* At least one SD card sends an all-zeroes byte when N(CX)
+ * applies, before the all-ones bytes ... just cope with that.
+ */
+ status = mmc_spi_readbytes(host, 1);
+ if (status < 0)
+ return status;
+ status = scratch->status[0];
+ if (status == 0xff || status == 0)
+ status = mmc_spi_readtoken(host);
+
+ if (status == SPI_TOKEN_SINGLE) {
+ if (host->dma_dev) {
+ dma_sync_single_for_device(host->dma_dev,
+ host->data_dma, sizeof(*scratch),
+ DMA_BIDIRECTIONAL);
+ dma_sync_single_for_device(host->dma_dev,
+ t->rx_dma, t->len,
+ DMA_FROM_DEVICE);
+ }
+
+ status = spi_sync(spi, &host->m);
+
+ if (host->dma_dev) {
+ dma_sync_single_for_cpu(host->dma_dev,
+ host->data_dma, sizeof(*scratch),
+ DMA_BIDIRECTIONAL);
+ dma_sync_single_for_cpu(host->dma_dev,
+ t->rx_dma, t->len,
+ DMA_FROM_DEVICE);
+ }
+
+ } else {
+ dev_dbg(&spi->dev, "read error %02x (%d)\n", status, status);
+
+ /* we've read extra garbage, timed out, etc */
+ if (status < 0)
+ return status;
+
+ /* low four bits are an R2 subset, fifth seems to be
+ * vendor specific ... map them all to generic error..
+ */
+ return -EIO;
+ }
+
+ if (host->mmc->use_spi_crc) {
+ u16 crc = crc_itu_t(0, t->rx_buf, t->len);
+
+ be16_to_cpus(&scratch->crc_val);
+ if (scratch->crc_val != crc) {
+ dev_dbg(&spi->dev, "read - crc error: crc_val=0x%04x, "
+ "computed=0x%04x len=%d\n",
+ scratch->crc_val, crc, t->len);
+ return -EILSEQ;
+ }
+ }
+
+ t->rx_buf += t->len;
+ if (host->dma_dev)
+ t->rx_dma += t->len;
+
+ return 0;
+}
+
+/*
+ * An MMC/SD data stage includes one or more blocks, optional CRCs,
+ * and inline handshaking. That handhaking makes it unlike most
+ * other SPI protocol stacks.
+ */
+static void
+mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
+ struct mmc_data *data, u32 blk_size)
+{
+ struct spi_device *spi = host->spi;
+ struct device *dma_dev = host->dma_dev;
+ struct spi_transfer *t;
+ enum dma_data_direction direction;
+ struct scatterlist *sg;
+ unsigned n_sg;
+ int multiple = (data->blocks > 1);
+
+ if (data->flags & MMC_DATA_READ)
+ direction = DMA_FROM_DEVICE;
+ else
+ direction = DMA_TO_DEVICE;
+ mmc_spi_setup_data_message(host, multiple, direction);
+ t = &host->t;
+
+ /* Handle scatterlist segments one at a time, with synch for
+ * each 512-byte block
+ */
+ for (sg = data->sg, n_sg = data->sg_len; n_sg; n_sg--, sg++) {
+ int status = 0;
+ dma_addr_t dma_addr = 0;
+ void *kmap_addr;
+ unsigned length = sg->length;
+ enum dma_data_direction dir = direction;
+
+ /* set up dma mapping for controller drivers that might
+ * use DMA ... though they may fall back to PIO
+ */
+ if (dma_dev) {
+ /* never invalidate whole *shared* pages ... */
+ if ((sg->offset != 0 || length != PAGE_SIZE)
+ && dir == DMA_FROM_DEVICE)
+ dir = DMA_BIDIRECTIONAL;
+
+ dma_addr = dma_map_page(dma_dev, sg_page(sg), 0,
+ PAGE_SIZE, dir);
+ if (direction == DMA_TO_DEVICE)
+ t->tx_dma = dma_addr + sg->offset;
+ else
+ t->rx_dma = dma_addr + sg->offset;
+ }
+
+ /* allow pio too; we don't allow highmem */
+ kmap_addr = kmap(sg_page(sg));
+ if (direction == DMA_TO_DEVICE)
+ t->tx_buf = kmap_addr + sg->offset;
+ else
+ t->rx_buf = kmap_addr + sg->offset;
+
+ /* transfer each block, and update request status */
+ while (length) {
+ t->len = min(length, blk_size);
+
+ dev_dbg(&host->spi->dev,
+ " mmc_spi: %s block, %d bytes\n",
+ (direction == DMA_TO_DEVICE)
+ ? "write"
+ : "read",
+ t->len);
+
+ if (direction == DMA_TO_DEVICE)
+ status = mmc_spi_writeblock(host, t);
+ else
+ status = mmc_spi_readblock(host, t);
+ if (status < 0)
+ break;
+
+ data->bytes_xfered += t->len;
+ length -= t->len;
+
+ if (!multiple)
+ break;
+ }
+
+ /* discard mappings */
+ if (direction == DMA_FROM_DEVICE)
+ flush_kernel_dcache_page(sg_page(sg));
+ kunmap(sg_page(sg));
+ if (dma_dev)
+ dma_unmap_page(dma_dev, dma_addr, PAGE_SIZE, dir);
+
+ if (status < 0) {
+ data->error = status;
+ dev_dbg(&spi->dev, "%s status %d\n",
+ (direction == DMA_TO_DEVICE)
+ ? "write" : "read",
+ status);
+ break;
+ }
+ }
+
+ /* NOTE some docs describe an MMC-only SET_BLOCK_COUNT (CMD23) that
+ * can be issued before multiblock writes. Unlike its more widely
+ * documented analogue for SD cards (SET_WR_BLK_ERASE_COUNT, ACMD23),
+ * that can affect the STOP_TRAN logic. Complete (and current)
+ * MMC specs should sort that out before Linux starts using CMD23.
+ */
+ if (direction == DMA_TO_DEVICE && multiple) {
+ struct scratch *scratch = host->data;
+ int tmp;
+ const unsigned statlen = sizeof(scratch->status);
+
+ dev_dbg(&spi->dev, " mmc_spi: STOP_TRAN\n");
+
+ /* Tweak the per-block message we set up earlier by morphing
+ * it to hold single buffer with the token followed by some
+ * all-ones bytes ... skip N(BR) (0..1), scan the rest for
+ * "not busy any longer" status, and leave chip selected.
+ */
+ INIT_LIST_HEAD(&host->m.transfers);
+ list_add(&host->early_status.transfer_list,
+ &host->m.transfers);
+
+ memset(scratch->status, 0xff, statlen);
+ scratch->status[0] = SPI_TOKEN_STOP_TRAN;
+
+ host->early_status.tx_buf = host->early_status.rx_buf;
+ host->early_status.tx_dma = host->early_status.rx_dma;
+ host->early_status.len = statlen;
+
+ if (host->dma_dev)
+ dma_sync_single_for_device(host->dma_dev,
+ host->data_dma, sizeof(*scratch),
+ DMA_BIDIRECTIONAL);
+
+ tmp = spi_sync(spi, &host->m);
+
+ if (host->dma_dev)
+ dma_sync_single_for_cpu(host->dma_dev,
+ host->data_dma, sizeof(*scratch),
+ DMA_BIDIRECTIONAL);
+
+ if (tmp < 0) {
+ if (!data->error)
+ data->error = tmp;
+ return;
+ }
+
+ /* Ideally we collected "not busy" status with one I/O,
+ * avoiding wasteful byte-at-a-time scanning... but more
+ * I/O is often needed.
+ */
+ for (tmp = 2; tmp < statlen; tmp++) {
+ if (scratch->status[tmp] != 0)
+ return;
+ }
+ tmp = mmc_spi_wait_unbusy(host, writeblock_timeout);
+ if (tmp < 0 && !data->error)
+ data->error = tmp;
+ }
+}
+
+/****************************************************************************/
+
+/*
+ * MMC driver implementation -- the interface to the MMC stack
+ */
+
+static void mmc_spi_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+ struct mmc_spi_host *host = mmc_priv(mmc);
+ int status = -EINVAL;
+
+#ifdef DEBUG
+ /* MMC core and layered drivers *MUST* issue SPI-aware commands */
+ {
+ struct mmc_command *cmd;
+ int invalid = 0;
+
+ cmd = mrq->cmd;
+ if (!mmc_spi_resp_type(cmd)) {
+ dev_dbg(&host->spi->dev, "bogus command\n");
+ cmd->error = -EINVAL;
+ invalid = 1;
+ }
+
+ cmd = mrq->stop;
+ if (cmd && !mmc_spi_resp_type(cmd)) {
+ dev_dbg(&host->spi->dev, "bogus STOP command\n");
+ cmd->error = -EINVAL;
+ invalid = 1;
+ }
+
+ if (invalid) {
+ dump_stack();
+ mmc_request_done(host->mmc, mrq);
+ return;
+ }
+ }
+#endif
+
+ /* issue command; then optionally data and stop */
+ status = mmc_spi_command_send(host, mrq, mrq->cmd, mrq->data != NULL);
+ if (status == 0 && mrq->data) {
+ mmc_spi_data_do(host, mrq->cmd, mrq->data, mrq->data->blksz);
+ if (mrq->stop)
+ status = mmc_spi_command_send(host, mrq, mrq->stop, 0);
+ else
+ mmc_cs_off(host);
+ }
+
+ mmc_request_done(host->mmc, mrq);
+}
+
+/* See Section 6.4.1, in SD "Simplified Physical Layer Specification 2.0"
+ *
+ * NOTE that here we can't know that the card has just been powered up;
+ * not all MMC/SD sockets support power switching.
+ *
+ * FIXME when the card is still in SPI mode, e.g. from a previous kernel,
+ * this doesn't seem to do the right thing at all...
+ */
+static void mmc_spi_initsequence(struct mmc_spi_host *host)
+{
+ /* Try to be very sure any previous command has completed;
+ * wait till not-busy, skip debris from any old commands.
+ */
+ mmc_spi_wait_unbusy(host, r1b_timeout);
+ mmc_spi_readbytes(host, 10);
+
+ /*
+ * Do a burst with chipselect active-high. We need to do this to
+ * meet the requirement of 74 clock cycles with both chipselect
+ * and CMD (MOSI) high before CMD0 ... after the card has been
+ * powered up to Vdd(min), and so is ready to take commands.
+ *
+ * Some cards are particularly needy of this (e.g. Viking "SD256")
+ * while most others don't seem to care.
+ *
+ * Note that this is one of the places MMC/SD plays games with the
+ * SPI protocol. Another is that when chipselect is released while
+ * the card returns BUSY status, the clock must issue several cycles
+ * with chipselect high before the card will stop driving its output.
+ */
+ host->spi->mode |= SPI_CS_HIGH;
+ if (spi_setup(host->spi) != 0) {
+ /* Just warn; most cards work without it. */
+ dev_warn(&host->spi->dev,
+ "can't change chip-select polarity\n");
+ host->spi->mode &= ~SPI_CS_HIGH;
+ } else {
+ mmc_spi_readbytes(host, 18);
+
+ host->spi->mode &= ~SPI_CS_HIGH;
+ if (spi_setup(host->spi) != 0) {
+ /* Wot, we can't get the same setup we had before? */
+ dev_err(&host->spi->dev,
+ "can't restore chip-select polarity\n");
+ }
+ }
+}
+
+static char *mmc_powerstring(u8 power_mode)
+{
+ switch (power_mode) {
+ case MMC_POWER_OFF: return "off";
+ case MMC_POWER_UP: return "up";
+ case MMC_POWER_ON: return "on";
+ }
+ return "?";
+}
+
+static void mmc_spi_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct mmc_spi_host *host = mmc_priv(mmc);
+
+ if (host->power_mode != ios->power_mode) {
+ int canpower;
+
+ canpower = host->pdata && host->pdata->setpower;
+
+ dev_dbg(&host->spi->dev, "mmc_spi: power %s (%d)%s\n",
+ mmc_powerstring(ios->power_mode),
+ ios->vdd,
+ canpower ? ", can switch" : "");
+
+ /* switch power on/off if possible, accounting for
+ * max 250msec powerup time if needed.
+ */
+ if (canpower) {
+ switch (ios->power_mode) {
+ case MMC_POWER_OFF:
+ case MMC_POWER_UP:
+ host->pdata->setpower(&host->spi->dev,
+ ios->vdd);
+ if (ios->power_mode == MMC_POWER_UP)
+ msleep(host->powerup_msecs);
+ }
+ }
+
+ /* See 6.4.1 in the simplified SD card physical spec 2.0 */
+ if (ios->power_mode == MMC_POWER_ON)
+ mmc_spi_initsequence(host);
+
+ /* If powering down, ground all card inputs to avoid power
+ * delivery from data lines! On a shared SPI bus, this
+ * will probably be temporary; 6.4.2 of the simplified SD
+ * spec says this must last at least 1msec.
+ *
+ * - Clock low means CPOL 0, e.g. mode 0
+ * - MOSI low comes from writing zero
+ * - Chipselect is usually active low...
+ */
+ if (canpower && ios->power_mode == MMC_POWER_OFF) {
+ int mres;
+
+ host->spi->mode &= ~(SPI_CPOL|SPI_CPHA);
+ mres = spi_setup(host->spi);
+ if (mres < 0)
+ dev_dbg(&host->spi->dev,
+ "switch to SPI mode 0 failed\n");
+
+ if (spi_w8r8(host->spi, 0x00) < 0)
+ dev_dbg(&host->spi->dev,
+ "put spi signals to low failed\n");
+
+ /*
+ * Now clock should be low due to spi mode 0;
+ * MOSI should be low because of written 0x00;
+ * chipselect should be low (it is active low)
+ * power supply is off, so now MMC is off too!
+ *
+ * FIXME no, chipselect can be high since the
+ * device is inactive and SPI_CS_HIGH is clear...
+ */
+ msleep(10);
+ if (mres == 0) {
+ host->spi->mode |= (SPI_CPOL|SPI_CPHA);
+ mres = spi_setup(host->spi);
+ if (mres < 0)
+ dev_dbg(&host->spi->dev,
+ "switch back to SPI mode 3"
+ " failed\n");
+ }
+ }
+
+ host->power_mode = ios->power_mode;
+ }
+
+ if (host->spi->max_speed_hz != ios->clock && ios->clock != 0) {
+ int status;
+
+ host->spi->max_speed_hz = ios->clock;
+ status = spi_setup(host->spi);
+ dev_dbg(&host->spi->dev,
+ "mmc_spi: clock to %d Hz, %d\n",
+ host->spi->max_speed_hz, status);
+ }
+}
+
+static int mmc_spi_get_ro(struct mmc_host *mmc)
+{
+ struct mmc_spi_host *host = mmc_priv(mmc);
+
+ if (host->pdata && host->pdata->get_ro)
+ return host->pdata->get_ro(mmc->parent);
+ /* board doesn't support read only detection; assume writeable */
+ return 0;
+}
+
+
+static const struct mmc_host_ops mmc_spi_ops = {
+ .request = mmc_spi_request,
+ .set_ios = mmc_spi_set_ios,
+ .get_ro = mmc_spi_get_ro,
+};
+
+
+/****************************************************************************/
+
+/*
+ * SPI driver implementation
+ */
+
+static irqreturn_t
+mmc_spi_detect_irq(int irq, void *mmc)
+{
+ struct mmc_spi_host *host = mmc_priv(mmc);
+ u16 delay_msec = max(host->pdata->detect_delay, (u16)100);
+
+ mmc_detect_change(mmc, msecs_to_jiffies(delay_msec));
+ return IRQ_HANDLED;
+}
+
+struct count_children {
+ unsigned n;
+ struct bus_type *bus;
+};
+
+static int maybe_count_child(struct device *dev, void *c)
+{
+ struct count_children *ccp = c;
+
+ if (dev->bus == ccp->bus) {
+ if (ccp->n)
+ return -EBUSY;
+ ccp->n++;
+ }
+ return 0;
+}
+
+static int mmc_spi_probe(struct spi_device *spi)
+{
+ void *ones;
+ struct mmc_host *mmc;
+ struct mmc_spi_host *host;
+ int status;
+
+ /* MMC and SD specs only seem to care that sampling is on the
+ * rising edge ... meaning SPI modes 0 or 3. So either SPI mode
+ * should be legit. We'll use mode 0 since it seems to be a
+ * bit less troublesome on some hardware ... unclear why.
+ */
+ spi->mode = SPI_MODE_0;
+ spi->bits_per_word = 8;
+
+ status = spi_setup(spi);
+ if (status < 0) {
+ dev_dbg(&spi->dev, "needs SPI mode %02x, %d KHz; %d\n",
+ spi->mode, spi->max_speed_hz / 1000,
+ status);
+ return status;
+ }
+
+ /* We can use the bus safely iff nobody else will interfere with us.
+ * Most commands consist of one SPI message to issue a command, then
+ * several more to collect its response, then possibly more for data
+ * transfer. Clocking access to other devices during that period will
+ * corrupt the command execution.
+ *
+ * Until we have software primitives which guarantee non-interference,
+ * we'll aim for a hardware-level guarantee.
+ *
+ * REVISIT we can't guarantee another device won't be added later...
+ */
+ if (spi->master->num_chipselect > 1) {
+ struct count_children cc;
+
+ cc.n = 0;
+ cc.bus = spi->dev.bus;
+ status = device_for_each_child(spi->dev.parent, &cc,
+ maybe_count_child);
+ if (status < 0) {
+ dev_err(&spi->dev, "can't share SPI bus\n");
+ return status;
+ }
+
+ dev_warn(&spi->dev, "ASSUMING SPI bus stays unshared!\n");
+ }
+
+ /* We need a supply of ones to transmit. This is the only time
+ * the CPU touches these, so cache coherency isn't a concern.
+ *
+ * NOTE if many systems use more than one MMC-over-SPI connector
+ * it'd save some memory to share this. That's evidently rare.
+ */
+ status = -ENOMEM;
+ ones = kmalloc(MMC_SPI_BLOCKSIZE, GFP_KERNEL);
+ if (!ones)
+ goto nomem;
+ memset(ones, 0xff, MMC_SPI_BLOCKSIZE);
+
+ mmc = mmc_alloc_host(sizeof(*host), &spi->dev);
+ if (!mmc)
+ goto nomem;
+
+ mmc->ops = &mmc_spi_ops;
+ mmc->max_blk_size = MMC_SPI_BLOCKSIZE;
+
+ /* As long as we keep track of the number of successfully
+ * transmitted blocks, we're good for multiwrite.
+ */
+ mmc->caps = MMC_CAP_SPI | MMC_CAP_MULTIWRITE;
+
+ /* SPI doesn't need the lowspeed device identification thing for
+ * MMC or SD cards, since it never comes up in open drain mode.
+ * That's good; some SPI masters can't handle very low speeds!
+ *
+ * However, low speed SDIO cards need not handle over 400 KHz;
+ * that's the only reason not to use a few MHz for f_min (until
+ * the upper layer reads the target frequency from the CSD).
+ */
+ mmc->f_min = 400000;
+ mmc->f_max = spi->max_speed_hz;
+
+ host = mmc_priv(mmc);
+ host->mmc = mmc;
+ host->spi = spi;
+
+ host->ones = ones;
+
+ /* Platform data is used to hook up things like card sensing
+ * and power switching gpios.
+ */
+ host->pdata = spi->dev.platform_data;
+ if (host->pdata)
+ mmc->ocr_avail = host->pdata->ocr_mask;
+ if (!mmc->ocr_avail) {
+ dev_warn(&spi->dev, "ASSUMING 3.2-3.4 V slot power\n");
+ mmc->ocr_avail = MMC_VDD_32_33|MMC_VDD_33_34;
+ }
+ if (host->pdata && host->pdata->setpower) {
+ host->powerup_msecs = host->pdata->powerup_msecs;
+ if (!host->powerup_msecs || host->powerup_msecs > 250)
+ host->powerup_msecs = 250;
+ }
+
+ dev_set_drvdata(&spi->dev, mmc);
+
+ /* preallocate dma buffers */
+ host->data = kmalloc(sizeof(*host->data), GFP_KERNEL);
+ if (!host->data)
+ goto fail_nobuf1;
+
+//FIXME
+#if 0
+ if (spi->master->dev.parent->dma_mask) {
+ struct device *dev = spi->master->dev.parent;
+
+ host->dma_dev = dev;
+ host->ones_dma = dma_map_single(dev, ones,
+ MMC_SPI_BLOCKSIZE, DMA_TO_DEVICE);
+ host->data_dma = dma_map_single(dev, host->data,
+ sizeof(*host->data), DMA_BIDIRECTIONAL);
+
+ /* REVISIT in theory those map operations can fail... */
+
+ dma_sync_single_for_cpu(host->dma_dev,
+ host->data_dma, sizeof(*host->data),
+ DMA_BIDIRECTIONAL);
+ }
+#endif
+
+ /* setup message for status/busy readback */
+ spi_message_init(&host->readback);
+ host->readback.is_dma_mapped = (host->dma_dev != NULL);
+
+ spi_message_add_tail(&host->status, &host->readback);
+ host->status.tx_buf = host->ones;
+ host->status.tx_dma = host->ones_dma;
+ host->status.rx_buf = &host->data->status;
+ host->status.rx_dma = host->data_dma + offsetof(struct scratch, status);
+ host->status.cs_change = 1;
+
+ /* register card detect irq */
+ if (host->pdata && host->pdata->init) {
+ status = host->pdata->init(&spi->dev, mmc_spi_detect_irq, mmc);
+ if (status != 0)
+ goto fail_glue_init;
+ }
+
+ status = mmc_add_host(mmc);
+ if (status != 0)
+ goto fail_add_host;
+
+ dev_info(&spi->dev, "SD/MMC host %s%s%s%s\n",
+ mmc->class_dev.bus_id,
+ host->dma_dev ? "" : ", no DMA",
+ (host->pdata && host->pdata->get_ro)
+ ? "" : ", no WP",
+ (host->pdata && host->pdata->setpower)
+ ? "" : ", no poweroff");
+ return 0;
+
+fail_add_host:
+ mmc_remove_host (mmc);
+fail_glue_init:
+ if (host->dma_dev)
+ dma_unmap_single(host->dma_dev, host->data_dma,
+ sizeof(*host->data), DMA_BIDIRECTIONAL);
+ kfree(host->data);
+
+fail_nobuf1:
+ mmc_free_host(mmc);
+ dev_set_drvdata(&spi->dev, NULL);
+
+nomem:
+ kfree(ones);
+ return status;
+}
+
+
+static int __devexit mmc_spi_remove(struct spi_device *spi)
+{
+ struct mmc_host *mmc = dev_get_drvdata(&spi->dev);
+ struct mmc_spi_host *host;
+
+ if (mmc) {
+ host = mmc_priv(mmc);
+
+ /* prevent new mmc_detect_change() calls */
+ if (host->pdata && host->pdata->exit)
+ host->pdata->exit(&spi->dev, mmc);
+
+ mmc_remove_host(mmc);
+
+ if (host->dma_dev) {
+ dma_unmap_single(host->dma_dev, host->ones_dma,
+ MMC_SPI_BLOCKSIZE, DMA_TO_DEVICE);
+ dma_unmap_single(host->dma_dev, host->data_dma,
+ sizeof(*host->data), DMA_BIDIRECTIONAL);
+ }
+
+ kfree(host->data);
+ kfree(host->ones);
+
+ spi->max_speed_hz = mmc->f_max;
+ mmc_free_host(mmc);
+ dev_set_drvdata(&spi->dev, NULL);
+ }
+ return 0;
+}
+
+
+static struct spi_driver mmc_spi_driver = {
+ .driver = {
+ .name = "mmc_spi",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = mmc_spi_probe,
+ .remove = __devexit_p(mmc_spi_remove),
+};
+
+
+static int __init mmc_spi_init(void)
+{
+ return spi_register_driver(&mmc_spi_driver);
+}
+module_init(mmc_spi_init);
+
+
+static void __exit mmc_spi_exit(void)
+{
+ spi_unregister_driver(&mmc_spi_driver);
+}
+module_exit(mmc_spi_exit);
+
+
+MODULE_AUTHOR("Mike Lavender, David Brownell, "
+ "Hans-Peter Nilsson, Jan Nikitenko");
+MODULE_DESCRIPTION("SPI SD/MMC host driver");
+MODULE_LICENSE("GPL");
--- /dev/null
+++ b/include/linux/spi/mmc_spi.h
@@ -0,0 +1,33 @@
+#ifndef __LINUX_SPI_MMC_SPI_H
+#define __LINUX_SPI_MMC_SPI_H
+
+struct device;
+struct mmc_host;
+
+/* Put this in platform_data of a device being used to manage an MMC/SD
+ * card slot. (Modeled after PXA mmc glue; see that for usage examples.)
+ *
+ * REVISIT This is not a spi-specific notion. Any card slot should be
+ * able to handle it. If the MMC core doesn't adopt this kind of notion,
+ * switch the "struct device *" parameters over to "struct spi_device *".
+ */
+struct mmc_spi_platform_data {
+ /* driver activation and (optional) card detect irq hookup */
+ int (*init)(struct device *,
+ irqreturn_t (*)(int, void *),
+ void *);
+ void (*exit)(struct device *, void *);
+
+ /* sense switch on sd cards */
+ int (*get_ro)(struct device *);
+
+ /* how long to debounce card detect, in msecs */
+ u16 detect_delay;
+
+ /* power management */
+ u16 powerup_msecs; /* delay of up to 250 msec */
+ u32 ocr_mask; /* available voltages */
+ void (*setpower)(struct device *, unsigned int maskval);
+};
+
+#endif /* __LINUX_SPI_MMC_SPI_H */
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -19,6 +19,7 @@
#include "sysfs.h"
#include "core.h"
+#include "sdio_cis.h"
#include "bus.h"
#define dev_to_mmc_card(d) container_of(d, struct mmc_card, dev)
@@ -34,6 +35,8 @@ static ssize_t mmc_type_show(struct devi
return sprintf(buf, "MMC\n");
case MMC_TYPE_SD:
return sprintf(buf, "SD\n");
+ case MMC_TYPE_SDIO:
+ return sprintf(buf, "SDIO\n");
default:
return -EFAULT;
}
@@ -55,36 +58,37 @@ static int mmc_bus_match(struct device *
}
static int
-mmc_bus_uevent(struct device *dev, char **envp, int num_envp, char *buf,
- int buf_size)
+mmc_bus_uevent(struct device *dev, char **envp,
+ int num_envp, char *buffer, int buffer_size)
{
struct mmc_card *card = dev_to_mmc_card(dev);
- int retval = 0, i = 0, length = 0;
-
-#define add_env(fmt,val) do { \
- retval = add_uevent_var(envp, num_envp, &i, \
- buf, buf_size, &length, \
- fmt, val); \
- if (retval) \
- return retval; \
-} while (0);
+ const char *type;
+ int retval = 0;
+ int i = 0, len = 0;
switch (card->type) {
case MMC_TYPE_MMC:
- add_env("MMC_TYPE=%s", "MMC");
+ type = "MMC";
break;
case MMC_TYPE_SD:
- add_env("MMC_TYPE=%s", "SD");
+ type = "SD";
break;
+ case MMC_TYPE_SDIO:
+ type = "SDIO";
+ break;
+ default:
+ type = NULL;
}
- add_env("MMC_NAME=%s", mmc_card_name(card));
-
-#undef add_env
+ if (type) {
+ retval = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, "MMC_TYPE=%s", type);
+ if (retval)
+ return retval;
+ }
- envp[i] = NULL;
+ retval = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, "MMC_NAME=%s", mmc_card_name(card));
- return 0;
+ return retval;
}
static int mmc_bus_probe(struct device *dev)
@@ -176,6 +180,11 @@ static void mmc_release_card(struct devi
{
struct mmc_card *card = dev_to_mmc_card(dev);
+ sdio_free_common_cis(card);
+
+ if (card->info)
+ kfree(card->info);
+
kfree(card);
}
@@ -221,15 +230,25 @@ int mmc_add_card(struct mmc_card *card)
if (mmc_card_blockaddr(card))
type = "SDHC";
break;
+ case MMC_TYPE_SDIO:
+ type = "SDIO";
+ break;
default:
type = "?";
break;
}
- printk(KERN_INFO "%s: new %s%s card at address %04x\n",
- mmc_hostname(card->host),
- mmc_card_highspeed(card) ? "high speed " : "",
- type, card->rca);
+ if (mmc_host_is_spi(card->host)) {
+ printk(KERN_INFO "%s: new %s%s card on SPI\n",
+ mmc_hostname(card->host),
+ mmc_card_highspeed(card) ? "high speed " : "",
+ type);
+ } else {
+ printk(KERN_INFO "%s: new %s%s card at address %04x\n",
+ mmc_hostname(card->host),
+ mmc_card_highspeed(card) ? "high speed " : "",
+ type, card->rca);
+ }
card->dev.uevent_suppress = 1;
@@ -261,8 +280,13 @@ int mmc_add_card(struct mmc_card *card)
void mmc_remove_card(struct mmc_card *card)
{
if (mmc_card_present(card)) {
- printk(KERN_INFO "%s: card %04x removed\n",
- mmc_hostname(card->host), card->rca);
+ if (mmc_host_is_spi(card->host)) {
+ printk(KERN_INFO "%s: SPI card removed\n",
+ mmc_hostname(card->host));
+ } else {
+ printk(KERN_INFO "%s: card %04x removed\n",
+ mmc_hostname(card->host), card->rca);
+ }
if (card->host->bus_ops->sysfs_remove)
card->host->bus_ops->sysfs_remove(card->host, card);
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -18,7 +18,7 @@
#include <linux/delay.h>
#include <linux/pagemap.h>
#include <linux/err.h>
-#include <asm/scatterlist.h>
+#include <linux/leds.h>
#include <linux/scatterlist.h>
#include <linux/mmc/card.h>
@@ -29,16 +29,27 @@
#include "core.h"
#include "bus.h"
#include "host.h"
+#include "sdio_bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"
+#include "sdio_ops.h"
extern int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
extern int mmc_attach_sd(struct mmc_host *host, u32 ocr);
+extern int mmc_attach_sdio(struct mmc_host *host, u32 ocr);
static struct workqueue_struct *workqueue;
/*
+ * Enabling software CRCs on the data blocks can be a significant (30%)
+ * performance cost, and for other reasons may not always be desired.
+ * So we allow it it to be disabled.
+ */
+int use_spi_crc = 1;
+module_param(use_spi_crc, bool, 0);
+
+/*
* Internal function. Schedule delayed work in the MMC work queue.
*/
static int mmc_schedule_delayed_work(struct delayed_work *work,
@@ -68,6 +79,11 @@ void mmc_request_done(struct mmc_host *h
struct mmc_command *cmd = mrq->cmd;
int err = cmd->error;
+ if (err && cmd->retries && mmc_host_is_spi(host)) {
+ if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
+ cmd->retries = 0;
+ }
+
if (err && cmd->retries) {
pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
mmc_hostname(host), cmd->opcode, err);
@@ -76,6 +92,8 @@ void mmc_request_done(struct mmc_host *h
cmd->error = 0;
host->ops->request(host, mrq);
} else {
+ led_trigger_event(host->led, LED_OFF);
+
pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
mmc_hostname(host), cmd->opcode, err,
cmd->resp[0], cmd->resp[1],
@@ -118,7 +136,7 @@ mmc_start_request(struct mmc_host *host,
"tsac %d ms nsac %d\n",
mmc_hostname(host), mrq->data->blksz,
mrq->data->blocks, mrq->data->flags,
- mrq->data->timeout_ns / 10000000,
+ mrq->data->timeout_ns / 1000000,
mrq->data->timeout_clks);
}
@@ -130,6 +148,8 @@ mmc_start_request(struct mmc_host *host,
WARN_ON(!host->claimed);
+ led_trigger_event(host->led, LED_FULL);
+
mrq->cmd->error = 0;
mrq->cmd->mrq = mrq;
if (mrq->data) {
@@ -199,7 +219,7 @@ int mmc_wait_for_cmd(struct mmc_host *ho
{
struct mmc_request mrq;
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
memset(&mrq, 0, sizeof(struct mmc_request));
@@ -220,17 +240,24 @@ EXPORT_SYMBOL(mmc_wait_for_cmd);
* mmc_set_data_timeout - set the timeout for a data command
* @data: data phase for command
* @card: the MMC card associated with the data transfer
- * @write: flag to differentiate reads from writes
*
* Computes the data timeout parameters according to the
* correct algorithm given the card type.
*/
-void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card,
- int write)
+void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
{
unsigned int mult;
/*
+ * SDIO cards only define an upper 1 s limit on access.
+ */
+ if (mmc_card_sdio(card)) {
+ data->timeout_ns = 1000000000;
+ data->timeout_clks = 0;
+ return;
+ }
+
+ /*
* SD cards use a 100 multiplier rather than 10
*/
mult = mmc_card_sd(card) ? 100 : 10;
@@ -239,7 +266,7 @@ void mmc_set_data_timeout(struct mmc_dat
* Scale up the multiplier (and therefore the timeout) by
* the r2w factor for writes.
*/
- if (write)
+ if (data->flags & MMC_DATA_WRITE)
mult <<= card->csd.r2w_factor;
data->timeout_ns = card->csd.tacc_ns * mult;
@@ -255,7 +282,7 @@ void mmc_set_data_timeout(struct mmc_dat
timeout_us += data->timeout_clks * 1000 /
(card->host->ios.clock / 1000);
- if (write)
+ if (data->flags & MMC_DATA_WRITE)
limit_us = 250000;
else
limit_us = 100000;
@@ -272,15 +299,20 @@ void mmc_set_data_timeout(struct mmc_dat
EXPORT_SYMBOL(mmc_set_data_timeout);
/**
- * mmc_claim_host - exclusively claim a host
+ * __mmc_claim_host - exclusively claim a host
* @host: mmc host to claim
+ * @abort: whether or not the operation should be aborted
*
- * Claim a host for a set of operations.
+ * Claim a host for a set of operations. If @abort is non null and
+ * dereference a non-zero value then this will return prematurely with
+ * that non-zero value without acquiring the lock. Returns zero
+ * with the lock held otherwise.
*/
-void mmc_claim_host(struct mmc_host *host)
+int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
{
DECLARE_WAITQUEUE(wait, current);
unsigned long flags;
+ int stop;
might_sleep();
@@ -288,19 +320,24 @@ void mmc_claim_host(struct mmc_host *hos
spin_lock_irqsave(&host->lock, flags);
while (1) {
set_current_state(TASK_UNINTERRUPTIBLE);
- if (!host->claimed)
+ stop = abort ? atomic_read(abort) : 0;
+ if (stop || !host->claimed)
break;
spin_unlock_irqrestore(&host->lock, flags);
schedule();
spin_lock_irqsave(&host->lock, flags);
}
set_current_state(TASK_RUNNING);
- host->claimed = 1;
+ if (!stop)
+ host->claimed = 1;
+ else
+ wake_up(&host->wq);
spin_unlock_irqrestore(&host->lock, flags);
remove_wait_queue(&host->wq, &wait);
+ return stop;
}
-EXPORT_SYMBOL(mmc_claim_host);
+EXPORT_SYMBOL(__mmc_claim_host);
/**
* mmc_release_host - release a host
@@ -313,7 +350,7 @@ void mmc_release_host(struct mmc_host *h
{
unsigned long flags;
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
spin_lock_irqsave(&host->lock, flags);
host->claimed = 0;
@@ -433,19 +470,32 @@ static void mmc_power_up(struct mmc_host
int bit = fls(host->ocr_avail) - 1;
host->ios.vdd = bit;
- host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
- host->ios.chip_select = MMC_CS_DONTCARE;
+ if (mmc_host_is_spi(host)) {
+ host->ios.chip_select = MMC_CS_HIGH;
+ host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
+ } else {
+ host->ios.chip_select = MMC_CS_DONTCARE;
+ host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+ }
host->ios.power_mode = MMC_POWER_UP;
host->ios.bus_width = MMC_BUS_WIDTH_1;
host->ios.timing = MMC_TIMING_LEGACY;
mmc_set_ios(host);
- mmc_delay(1);
+ /*
+ * This delay should be sufficient to allow the power supply
+ * to reach the minimum voltage.
+ */
+ mmc_delay(2);
host->ios.clock = host->f_min;
host->ios.power_mode = MMC_POWER_ON;
mmc_set_ios(host);
+ /*
+ * This delay must be at least 74 clock sizes, or 1 ms, or the
+ * time required to reach a stable voltage.
+ */
mmc_delay(2);
}
@@ -453,8 +503,10 @@ static void mmc_power_off(struct mmc_hos
{
host->ios.clock = 0;
host->ios.vdd = 0;
- host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
- host->ios.chip_select = MMC_CS_DONTCARE;
+ if (!mmc_host_is_spi(host)) {
+ host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
+ host->ios.chip_select = MMC_CS_DONTCARE;
+ }
host->ios.power_mode = MMC_POWER_OFF;
host->ios.bus_width = MMC_BUS_WIDTH_1;
host->ios.timing = MMC_TIMING_LEGACY;
@@ -511,7 +563,7 @@ void mmc_attach_bus(struct mmc_host *hos
BUG_ON(!host);
BUG_ON(!ops);
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
spin_lock_irqsave(&host->lock, flags);
@@ -535,8 +587,8 @@ void mmc_detach_bus(struct mmc_host *hos
BUG_ON(!host);
- BUG_ON(!host->claimed);
- BUG_ON(!host->bus_ops);
+ WARN_ON(!host->claimed);
+ WARN_ON(!host->bus_ops);
spin_lock_irqsave(&host->lock, flags);
@@ -564,7 +616,7 @@ void mmc_detect_change(struct mmc_host *
#ifdef CONFIG_MMC_DEBUG
unsigned long flags;
spin_lock_irqsave(&host->lock, flags);
- BUG_ON(host->removed);
+ WARN_ON(host->removed);
spin_unlock_irqrestore(&host->lock, flags);
#endif
@@ -597,24 +649,38 @@ void mmc_rescan(struct work_struct *work
mmc_send_if_cond(host, host->ocr_avail);
+ /*
+ * First we search for SDIO...
+ */
+ err = mmc_send_io_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_sdio(host, ocr))
+ mmc_power_off(host);
+ return;
+ }
+
+ /*
+ * ...then normal SD...
+ */
err = mmc_send_app_op_cond(host, 0, &ocr);
- if (err == MMC_ERR_NONE) {
+ if (!err) {
if (mmc_attach_sd(host, ocr))
mmc_power_off(host);
- } else {
- /*
- * If we fail to detect any SD cards then try
- * searching for MMC cards.
- */
- err = mmc_send_op_cond(host, 0, &ocr);
- if (err == MMC_ERR_NONE) {
- if (mmc_attach_mmc(host, ocr))
- mmc_power_off(host);
- } else {
+ return;
+ }
+
+ /*
+ * ...and finally MMC.
+ */
+ err = mmc_send_op_cond(host, 0, &ocr);
+ if (!err) {
+ if (mmc_attach_mmc(host, ocr))
mmc_power_off(host);
- mmc_release_host(host);
- }
+ return;
}
+
+ mmc_release_host(host);
+ mmc_power_off(host);
} else {
if (host->bus_ops->detect && !host->bus_dead)
host->bus_ops->detect(host);
@@ -725,22 +791,38 @@ static int __init mmc_init(void)
return -ENOMEM;
ret = mmc_register_bus();
- if (ret == 0) {
- ret = mmc_register_host_class();
- if (ret)
- mmc_unregister_bus();
- }
+ if (ret)
+ goto destroy_workqueue;
+
+ ret = mmc_register_host_class();
+ if (ret)
+ goto unregister_bus;
+
+ ret = sdio_register_bus();
+ if (ret)
+ goto unregister_host_class;
+
+ return 0;
+
+unregister_host_class:
+ mmc_unregister_host_class();
+unregister_bus:
+ mmc_unregister_bus();
+destroy_workqueue:
+ destroy_workqueue(workqueue);
+
return ret;
}
static void __exit mmc_exit(void)
{
+ sdio_unregister_bus();
mmc_unregister_host_class();
mmc_unregister_bus();
destroy_workqueue(workqueue);
}
-module_init(mmc_init);
+subsys_initcall(mmc_init);
module_exit(mmc_exit);
MODULE_LICENSE("GPL");
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -48,5 +48,7 @@ void mmc_rescan(struct work_struct *work
void mmc_start_host(struct mmc_host *host);
void mmc_stop_host(struct mmc_host *host);
+extern int use_spi_crc;
+
#endif
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -15,6 +15,7 @@
#include <linux/err.h>
#include <linux/idr.h>
#include <linux/pagemap.h>
+#include <linux/leds.h>
#include <linux/mmc/host.h>
@@ -100,6 +101,9 @@ int mmc_add_host(struct mmc_host *host)
{
int err;
+ WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
+ !host->ops->enable_sdio_irq);
+
if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
return -ENOMEM;
@@ -112,6 +116,8 @@ int mmc_add_host(struct mmc_host *host)
snprintf(host->class_dev.bus_id, BUS_ID_SIZE,
"mmc%d", host->index);
+ led_trigger_register_simple(host->class_dev.bus_id, &host->led);
+
err = device_add(&host->class_dev);
if (err)
return err;
@@ -137,6 +143,8 @@ void mmc_remove_host(struct mmc_host *ho
device_del(&host->class_dev);
+ led_trigger_unregister_simple(host->led);
+
spin_lock(&mmc_host_lock);
idr_remove(&mmc_host_idr, host->index);
spin_unlock(&mmc_host_lock);
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -161,13 +161,12 @@ static int mmc_read_ext_csd(struct mmc_c
{
int err;
u8 *ext_csd;
+ unsigned int ext_csd_struct;
BUG_ON(!card);
- err = MMC_ERR_FAILED;
-
if (card->csd.mmca_vsn < CSD_SPEC_VER_4)
- return MMC_ERR_NONE;
+ return 0;
/*
* As the ext_csd is so large and mostly unused, we don't store the
@@ -176,13 +175,19 @@ static int mmc_read_ext_csd(struct mmc_c
ext_csd = kmalloc(512, GFP_KERNEL);
if (!ext_csd) {
printk(KERN_ERR "%s: could not allocate a buffer to "
- "receive the ext_csd. mmc v4 cards will be "
- "treated as v3.\n", mmc_hostname(card->host));
- return MMC_ERR_FAILED;
+ "receive the ext_csd.\n", mmc_hostname(card->host));
+ return -ENOMEM;
}
err = mmc_send_ext_csd(card, ext_csd);
- if (err != MMC_ERR_NONE) {
+ if (err) {
+ /*
+ * We all hosts that cannot perform the command
+ * to fail more gracefully
+ */
+ if (err != -EINVAL)
+ goto out;
+
/*
* High capacity cards should have this "magic" size
* stored in their CSD.
@@ -197,18 +202,30 @@ static int mmc_read_ext_csd(struct mmc_c
"EXT_CSD, performance might "
"suffer.\n",
mmc_hostname(card->host));
- err = MMC_ERR_NONE;
+ err = 0;
}
+
goto out;
}
- card->ext_csd.sectors =
- ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
- ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
- ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
- ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
- if (card->ext_csd.sectors)
- mmc_card_set_blockaddr(card);
+ ext_csd_struct = ext_csd[EXT_CSD_REV];
+ if (ext_csd_struct > 2) {
+ printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
+ "version %d\n", mmc_hostname(card->host),
+ ext_csd_struct);
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (ext_csd_struct >= 2) {
+ card->ext_csd.sectors =
+ ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
+ ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
+ ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
+ ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
+ if (card->ext_csd.sectors)
+ mmc_card_set_blockaddr(card);
+ }
switch (ext_csd[EXT_CSD_CARD_TYPE]) {
case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
@@ -246,7 +263,7 @@ static int mmc_init_card(struct mmc_host
unsigned int max_dtr;
BUG_ON(!host);
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
/*
* Since we're changing the OCR value, we seem to
@@ -258,19 +275,33 @@ static int mmc_init_card(struct mmc_host
/* The extra bit indicates that we support high capacity */
err = mmc_send_op_cond(host, ocr | (1 << 30), NULL);
- if (err != MMC_ERR_NONE)
+ if (err)
goto err;
/*
+ * For SPI, enable CRC as appropriate.
+ */
+ if (mmc_host_is_spi(host)) {
+ err = mmc_spi_set_crc(host, use_spi_crc);
+ if (err)
+ goto err;
+ }
+
+ /*
* Fetch CID from card.
*/
- err = mmc_all_send_cid(host, cid);
- if (err != MMC_ERR_NONE)
+ if (mmc_host_is_spi(host))
+ err = mmc_send_cid(host, cid);
+ else
+ err = mmc_all_send_cid(host, cid);
+ if (err)
goto err;
if (oldcard) {
- if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
+ if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
+ err = -ENOENT;
goto err;
+ }
card = oldcard;
} else {
@@ -278,8 +309,10 @@ static int mmc_init_card(struct mmc_host
* Allocate card structure.
*/
card = mmc_alloc_card(host);
- if (IS_ERR(card))
+ if (IS_ERR(card)) {
+ err = PTR_ERR(card);
goto err;
+ }
card->type = MMC_TYPE_MMC;
card->rca = 1;
@@ -287,43 +320,47 @@ static int mmc_init_card(struct mmc_host
}
/*
- * Set card RCA.
+ * For native busses: set card RCA and quit open drain mode.
*/
- err = mmc_set_relative_addr(card);
- if (err != MMC_ERR_NONE)
- goto free_card;
+ if (!mmc_host_is_spi(host)) {
+ err = mmc_set_relative_addr(card);
+ if (err)
+ goto free_card;
- mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+ mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+ }
if (!oldcard) {
/*
* Fetch CSD from card.
*/
err = mmc_send_csd(card, card->raw_csd);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
err = mmc_decode_csd(card);
- if (err < 0)
+ if (err)
goto free_card;
err = mmc_decode_cid(card);
- if (err < 0)
+ if (err)
goto free_card;
}
/*
* Select card, as all following commands rely on that.
*/
- err = mmc_select_card(card);
- if (err != MMC_ERR_NONE)
- goto free_card;
+ if (!mmc_host_is_spi(host)) {
+ err = mmc_select_card(card);
+ if (err)
+ goto free_card;
+ }
if (!oldcard) {
/*
- * Fetch and process extened CSD.
+ * Fetch and process extended CSD.
*/
err = mmc_read_ext_csd(card);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
}
@@ -334,7 +371,7 @@ static int mmc_init_card(struct mmc_host
(host->caps & MMC_CAP_MMC_HIGHSPEED)) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, 1);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
mmc_card_set_highspeed(card);
@@ -363,7 +400,7 @@ static int mmc_init_card(struct mmc_host
(host->caps & MMC_CAP_4_BIT_DATA)) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH, EXT_CSD_BUS_WIDTH_4);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
@@ -372,14 +409,14 @@ static int mmc_init_card(struct mmc_host
if (!oldcard)
host->card = card;
- return MMC_ERR_NONE;
+ return 0;
free_card:
if (!oldcard)
mmc_remove_card(card);
err:
- return MMC_ERR_FAILED;
+ return err;
}
/*
@@ -413,7 +450,7 @@ static void mmc_detect(struct mmc_host *
mmc_release_host(host);
- if (err != MMC_ERR_NONE) {
+ if (err) {
mmc_remove(host);
mmc_claim_host(host);
@@ -480,7 +517,8 @@ static void mmc_suspend(struct mmc_host
BUG_ON(!host->card);
mmc_claim_host(host);
- mmc_deselect_cards(host);
+ if (!mmc_host_is_spi(host))
+ mmc_deselect_cards(host);
host->card->state &= ~MMC_STATE_HIGHSPEED;
mmc_release_host(host);
}
@@ -502,7 +540,7 @@ static void mmc_resume(struct mmc_host *
err = mmc_init_card(host, host->ocr, host->card);
mmc_release_host(host);
- if (err != MMC_ERR_NONE) {
+ if (err) {
mmc_remove(host);
mmc_claim_host(host);
@@ -536,11 +574,20 @@ int mmc_attach_mmc(struct mmc_host *host
int err;
BUG_ON(!host);
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
mmc_attach_bus(host, &mmc_ops);
/*
+ * We need to get OCR a different way for SPI.
+ */
+ if (mmc_host_is_spi(host)) {
+ err = mmc_spi_read_ocr(host, 1, &ocr);
+ if (err)
+ goto err;
+ }
+
+ /*
* Sanity check the voltages that the card claims to
* support.
*/
@@ -565,7 +612,7 @@ int mmc_attach_mmc(struct mmc_host *host
* Detect and init the card.
*/
err = mmc_init_card(host, host->ocr, NULL);
- if (err != MMC_ERR_NONE)
+ if (err)
goto err;
mmc_release_host(host);
@@ -587,6 +634,6 @@ err:
printk(KERN_ERR "%s: error %d whilst initialising MMC card\n",
mmc_hostname(host), err);
- return 0;
+ return err;
}
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -10,7 +10,6 @@
*/
#include <linux/types.h>
-#include <asm/scatterlist.h>
#include <linux/scatterlist.h>
#include <linux/mmc/host.h>
@@ -40,10 +39,10 @@ static int _mmc_select_card(struct mmc_h
}
err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
- return MMC_ERR_NONE;
+ return 0;
}
int mmc_select_card(struct mmc_card *card)
@@ -63,23 +62,36 @@ int mmc_go_idle(struct mmc_host *host)
int err;
struct mmc_command cmd;
- mmc_set_chip_select(host, MMC_CS_HIGH);
-
- mmc_delay(1);
+ /*
+ * Non-SPI hosts need to prevent chipselect going active during
+ * GO_IDLE; that would put chips into SPI mode. Remind them of
+ * that in case of hardware that won't pull up DAT3/nCS otherwise.
+ *
+ * SPI hosts ignore ios.chip_select; it's managed according to
+ * rules that must accomodate non-MMC slaves which this layer
+ * won't even know about.
+ */
+ if (!mmc_host_is_spi(host)) {
+ mmc_set_chip_select(host, MMC_CS_HIGH);
+ mmc_delay(1);
+ }
memset(&cmd, 0, sizeof(struct mmc_command));
cmd.opcode = MMC_GO_IDLE_STATE;
cmd.arg = 0;
- cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
err = mmc_wait_for_cmd(host, &cmd, 0);
mmc_delay(1);
- mmc_set_chip_select(host, MMC_CS_DONTCARE);
+ if (!mmc_host_is_spi(host)) {
+ mmc_set_chip_select(host, MMC_CS_DONTCARE);
+ mmc_delay(1);
+ }
- mmc_delay(1);
+ host->use_spi_crc = 0;
return err;
}
@@ -94,23 +106,33 @@ int mmc_send_op_cond(struct mmc_host *ho
memset(&cmd, 0, sizeof(struct mmc_command));
cmd.opcode = MMC_SEND_OP_COND;
- cmd.arg = ocr;
- cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
+ cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
for (i = 100; i; i--) {
err = mmc_wait_for_cmd(host, &cmd, 0);
- if (err != MMC_ERR_NONE)
+ if (err)
break;
- if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
+ /* if we're just probing, do a single pass */
+ if (ocr == 0)
break;
- err = MMC_ERR_TIMEOUT;
+ /* otherwise wait until reset completes */
+ if (mmc_host_is_spi(host)) {
+ if (!(cmd.resp[0] & R1_SPI_IDLE))
+ break;
+ } else {
+ if (cmd.resp[0] & MMC_CARD_BUSY)
+ break;
+ }
+
+ err = -ETIMEDOUT;
mmc_delay(10);
}
- if (rocr)
+ if (rocr && !mmc_host_is_spi(host))
*rocr = cmd.resp[0];
return err;
@@ -131,12 +153,12 @@ int mmc_all_send_cid(struct mmc_host *ho
cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
memcpy(cid, cmd.resp, sizeof(u32) * 4);
- return MMC_ERR_NONE;
+ return 0;
}
int mmc_set_relative_addr(struct mmc_card *card)
@@ -154,46 +176,52 @@ int mmc_set_relative_addr(struct mmc_car
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
- return MMC_ERR_NONE;
+ return 0;
}
-int mmc_send_csd(struct mmc_card *card, u32 *csd)
+static int
+mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
{
int err;
struct mmc_command cmd;
- BUG_ON(!card);
- BUG_ON(!card->host);
- BUG_ON(!csd);
+ BUG_ON(!host);
+ BUG_ON(!cxd);
memset(&cmd, 0, sizeof(struct mmc_command));
- cmd.opcode = MMC_SEND_CSD;
- cmd.arg = card->rca << 16;
+ cmd.opcode = opcode;
+ cmd.arg = arg;
cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
- err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
- if (err != MMC_ERR_NONE)
+ err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+ if (err)
return err;
- memcpy(csd, cmd.resp, sizeof(u32) * 4);
+ memcpy(cxd, cmd.resp, sizeof(u32) * 4);
- return MMC_ERR_NONE;
+ return 0;
}
-int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
+static int
+mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
+ u32 opcode, void *buf, unsigned len)
{
struct mmc_request mrq;
struct mmc_command cmd;
struct mmc_data data;
struct scatterlist sg;
+ void *data_buf;
- BUG_ON(!card);
- BUG_ON(!card->host);
- BUG_ON(!ext_csd);
+ /* dma onto stack is unsafe/nonportable, but callers to this
+ * routine normally provide temporary on-stack buffers ...
+ */
+ data_buf = kmalloc(len, GFP_KERNEL);
+ if (data_buf == NULL)
+ return -ENOMEM;
memset(&mrq, 0, sizeof(struct mmc_request));
memset(&cmd, 0, sizeof(struct mmc_command));
@@ -202,28 +230,117 @@ int mmc_send_ext_csd(struct mmc_card *ca
mrq.cmd = &cmd;
mrq.data = &data;
- cmd.opcode = MMC_SEND_EXT_CSD;
+ cmd.opcode = opcode;
cmd.arg = 0;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
- data.blksz = 512;
+ /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
+ * rely on callers to never use this with "native" calls for reading
+ * CSD or CID. Native versions of those commands use the R2 type,
+ * not R1 plus a data block.
+ */
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+
+ data.blksz = len;
data.blocks = 1;
data.flags = MMC_DATA_READ;
data.sg = &sg;
data.sg_len = 1;
- sg_init_one(&sg, ext_csd, 512);
+ sg_init_one(&sg, data_buf, len);
+
+ if (card)
+ mmc_set_data_timeout(&data, card);
- mmc_set_data_timeout(&data, card, 0);
+ mmc_wait_for_req(host, &mrq);
- mmc_wait_for_req(card->host, &mrq);
+ memcpy(buf, data_buf, len);
+ kfree(data_buf);
- if (cmd.error != MMC_ERR_NONE)
+ if (cmd.error)
return cmd.error;
- if (data.error != MMC_ERR_NONE)
+ if (data.error)
return data.error;
- return MMC_ERR_NONE;
+ return 0;
+}
+
+int mmc_send_csd(struct mmc_card *card, u32 *csd)
+{
+ int ret, i;
+
+ if (!mmc_host_is_spi(card->host))
+ return mmc_send_cxd_native(card->host, card->rca << 16,
+ csd, MMC_SEND_CSD);
+
+ ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
+ if (ret)
+ return ret;
+
+ for (i = 0;i < 4;i++)
+ csd[i] = be32_to_cpu(csd[i]);
+
+ return 0;
+}
+
+int mmc_send_cid(struct mmc_host *host, u32 *cid)
+{
+ int ret, i;
+
+ if (!mmc_host_is_spi(host)) {
+ if (!host->card)
+ return -EINVAL;
+ return mmc_send_cxd_native(host, host->card->rca << 16,
+ cid, MMC_SEND_CID);
+ }
+
+ ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
+ if (ret)
+ return ret;
+
+ for (i = 0;i < 4;i++)
+ cid[i] = be32_to_cpu(cid[i]);
+
+ return 0;
+}
+
+int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
+{
+ return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
+ ext_csd, 512);
+}
+
+int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
+{
+ struct mmc_command cmd;
+ int err;
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = MMC_SPI_READ_OCR;
+ cmd.arg = highcap ? (1 << 30) : 0;
+ cmd.flags = MMC_RSP_SPI_R3;
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+
+ *ocrp = cmd.resp[1];
+ return err;
+}
+
+int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
+{
+ struct mmc_command cmd;
+ int err;
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = MMC_SPI_CRC_ON_OFF;
+ cmd.flags = MMC_RSP_SPI_R1;
+ cmd.arg = use_crc;
+
+ err = mmc_wait_for_cmd(host, &cmd, 0);
+ if (!err)
+ host->use_spi_crc = use_crc;
+ return err;
}
int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value)
@@ -241,13 +358,13 @@ int mmc_switch(struct mmc_card *card, u8
(index << 16) |
(value << 8) |
set;
- cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
+ cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
- return MMC_ERR_NONE;
+ return 0;
}
int mmc_send_status(struct mmc_card *card, u32 *status)
@@ -261,16 +378,20 @@ int mmc_send_status(struct mmc_card *car
memset(&cmd, 0, sizeof(struct mmc_command));
cmd.opcode = MMC_SEND_STATUS;
- cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+ if (!mmc_host_is_spi(card->host))
+ cmd.arg = card->rca << 16;
+ cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
+ /* NOTE: callers are required to understand the difference
+ * between "native" and SPI format status words!
+ */
if (status)
*status = cmd.resp[0];
- return MMC_ERR_NONE;
+ return 0;
}
--- a/drivers/mmc/core/mmc_ops.h
+++ b/drivers/mmc/core/mmc_ops.h
@@ -22,6 +22,9 @@ int mmc_send_csd(struct mmc_card *card,
int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd);
int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value);
int mmc_send_status(struct mmc_card *card, u32 *status);
+int mmc_send_cid(struct mmc_host *host, u32 *cid);
+int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp);
+int mmc_spi_set_crc(struct mmc_host *host, int use_crc);
#endif
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -166,8 +166,6 @@ static int mmc_decode_scr(struct mmc_car
unsigned int scr_struct;
u32 resp[4];
- BUG_ON(!mmc_card_sd(card));
-
resp[3] = card->raw_scr[1];
resp[2] = card->raw_scr[0];
@@ -193,30 +191,38 @@ static int mmc_read_switch(struct mmc_ca
u8 *status;
if (card->scr.sda_vsn < SCR_SPEC_VER_1)
- return MMC_ERR_NONE;
+ return 0;
if (!(card->csd.cmdclass & CCC_SWITCH)) {
printk(KERN_WARNING "%s: card lacks mandatory switch "
"function, performance might suffer.\n",
mmc_hostname(card->host));
- return MMC_ERR_NONE;
+ return 0;
}
- err = MMC_ERR_FAILED;
+ err = -EIO;
status = kmalloc(64, GFP_KERNEL);
if (!status) {
printk(KERN_ERR "%s: could not allocate a buffer for "
"switch capabilities.\n", mmc_hostname(card->host));
- return err;
+ return -ENOMEM;
}
err = mmc_sd_switch(card, 0, 0, 1, status);
- if (err != MMC_ERR_NONE) {
+ if (err) {
+ /*
+ * We all hosts that cannot perform the command
+ * to fail more gracefully
+ */
+ if (err != -EINVAL)
+ goto out;
+
printk(KERN_WARNING "%s: problem reading switch "
"capabilities, performance might suffer.\n",
mmc_hostname(card->host));
- err = MMC_ERR_NONE;
+ err = 0;
+
goto out;
}
@@ -238,28 +244,28 @@ static int mmc_switch_hs(struct mmc_card
u8 *status;
if (card->scr.sda_vsn < SCR_SPEC_VER_1)
- return MMC_ERR_NONE;
+ return 0;
if (!(card->csd.cmdclass & CCC_SWITCH))
- return MMC_ERR_NONE;
+ return 0;
if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
- return MMC_ERR_NONE;
+ return 0;
if (card->sw_caps.hs_max_dtr == 0)
- return MMC_ERR_NONE;
+ return 0;
- err = MMC_ERR_FAILED;
+ err = -EIO;
status = kmalloc(64, GFP_KERNEL);
if (!status) {
printk(KERN_ERR "%s: could not allocate a buffer for "
"switch capabilities.\n", mmc_hostname(card->host));
- return err;
+ return -ENOMEM;
}
err = mmc_sd_switch(card, 1, 0, 1, status);
- if (err != MMC_ERR_NONE)
+ if (err)
goto out;
if ((status[16] & 0xF) != 1) {
@@ -292,7 +298,7 @@ static int mmc_sd_init_card(struct mmc_h
unsigned int max_dtr;
BUG_ON(!host);
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
/*
* Since we're changing the OCR value, we seem to
@@ -309,23 +315,37 @@ static int mmc_sd_init_card(struct mmc_h
* block-addressed SDHC cards.
*/
err = mmc_send_if_cond(host, ocr);
- if (err == MMC_ERR_NONE)
+ if (!err)
ocr |= 1 << 30;
err = mmc_send_app_op_cond(host, ocr, NULL);
- if (err != MMC_ERR_NONE)
+ if (err)
goto err;
/*
+ * For SPI, enable CRC as appropriate.
+ */
+ if (mmc_host_is_spi(host)) {
+ err = mmc_spi_set_crc(host, use_spi_crc);
+ if (err)
+ goto err;
+ }
+
+ /*
* Fetch CID from card.
*/
- err = mmc_all_send_cid(host, cid);
- if (err != MMC_ERR_NONE)
+ if (mmc_host_is_spi(host))
+ err = mmc_send_cid(host, cid);
+ else
+ err = mmc_all_send_cid(host, cid);
+ if (err)
goto err;
if (oldcard) {
- if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0)
+ if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
+ err = -ENOENT;
goto err;
+ }
card = oldcard;
} else {
@@ -333,32 +353,36 @@ static int mmc_sd_init_card(struct mmc_h
* Allocate card structure.
*/
card = mmc_alloc_card(host);
- if (IS_ERR(card))
+ if (IS_ERR(card)) {
+ err = PTR_ERR(card);
goto err;
+ }
card->type = MMC_TYPE_SD;
memcpy(card->raw_cid, cid, sizeof(card->raw_cid));
}
/*
- * Set card RCA.
+ * For native busses: get card RCA and quit open drain mode.
*/
- err = mmc_send_relative_addr(host, &card->rca);
- if (err != MMC_ERR_NONE)
- goto free_card;
+ if (!mmc_host_is_spi(host)) {
+ err = mmc_send_relative_addr(host, &card->rca);
+ if (err)
+ goto free_card;
- mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+ mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+ }
if (!oldcard) {
/*
* Fetch CSD from card.
*/
err = mmc_send_csd(card, card->raw_csd);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
err = mmc_decode_csd(card);
- if (err < 0)
+ if (err)
goto free_card;
mmc_decode_cid(card);
@@ -367,16 +391,18 @@ static int mmc_sd_init_card(struct mmc_h
/*
* Select card, as all following commands rely on that.
*/
- err = mmc_select_card(card);
- if (err != MMC_ERR_NONE)
- goto free_card;
+ if (!mmc_host_is_spi(host)) {
+ err = mmc_select_card(card);
+ if (err)
+ goto free_card;
+ }
if (!oldcard) {
/*
* Fetch SCR from card.
*/
err = mmc_app_send_scr(card, card->raw_scr);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
err = mmc_decode_scr(card);
@@ -387,7 +413,7 @@ static int mmc_sd_init_card(struct mmc_h
* Fetch switch information from card.
*/
err = mmc_read_switch(card);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
}
@@ -395,7 +421,7 @@ static int mmc_sd_init_card(struct mmc_h
* Attempt to change to high-speed (if supported)
*/
err = mmc_switch_hs(card);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
/*
@@ -418,7 +444,7 @@ static int mmc_sd_init_card(struct mmc_h
if ((host->caps & MMC_CAP_4_BIT_DATA) &&
(card->scr.bus_widths & SD_SCR_BUS_WIDTH_4)) {
err = mmc_app_set_bus_width(card, MMC_BUS_WIDTH_4);
- if (err != MMC_ERR_NONE)
+ if (err)
goto free_card;
mmc_set_bus_width(host, MMC_BUS_WIDTH_4);
@@ -442,14 +468,14 @@ static int mmc_sd_init_card(struct mmc_h
if (!oldcard)
host->card = card;
- return MMC_ERR_NONE;
+ return 0;
free_card:
if (!oldcard)
mmc_remove_card(card);
err:
- return MMC_ERR_FAILED;
+ return err;
}
/*
@@ -483,7 +509,7 @@ static void mmc_sd_detect(struct mmc_hos
mmc_release_host(host);
- if (err != MMC_ERR_NONE) {
+ if (err) {
mmc_sd_remove(host);
mmc_claim_host(host);
@@ -552,7 +578,8 @@ static void mmc_sd_suspend(struct mmc_ho
BUG_ON(!host->card);
mmc_claim_host(host);
- mmc_deselect_cards(host);
+ if (!mmc_host_is_spi(host))
+ mmc_deselect_cards(host);
host->card->state &= ~MMC_STATE_HIGHSPEED;
mmc_release_host(host);
}
@@ -574,7 +601,7 @@ static void mmc_sd_resume(struct mmc_hos
err = mmc_sd_init_card(host, host->ocr, host->card);
mmc_release_host(host);
- if (err != MMC_ERR_NONE) {
+ if (err) {
mmc_sd_remove(host);
mmc_claim_host(host);
@@ -608,11 +635,22 @@ int mmc_attach_sd(struct mmc_host *host,
int err;
BUG_ON(!host);
- BUG_ON(!host->claimed);
+ WARN_ON(!host->claimed);
mmc_attach_bus(host, &mmc_sd_ops);
/*
+ * We need to get OCR a different way for SPI.
+ */
+ if (mmc_host_is_spi(host)) {
+ mmc_go_idle(host);
+
+ err = mmc_spi_read_ocr(host, 0, &ocr);
+ if (err)
+ goto err;
+ }
+
+ /*
* Sanity check the voltages that the card claims to
* support.
*/
@@ -644,7 +682,7 @@ int mmc_attach_sd(struct mmc_host *host,
* Detect and init the card.
*/
err = mmc_sd_init_card(host, host->ocr, NULL);
- if (err != MMC_ERR_NONE)
+ if (err)
goto err;
mmc_release_host(host);
@@ -666,6 +704,6 @@ err:
printk(KERN_ERR "%s: error %d whilst initialising SD card\n",
mmc_hostname(host), err);
- return 0;
+ return err;
}
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -10,7 +10,6 @@
*/
#include <linux/types.h>
-#include <asm/scatterlist.h>
#include <linux/scatterlist.h>
#include <linux/mmc/host.h>
@@ -33,21 +32,21 @@ static int mmc_app_cmd(struct mmc_host *
if (card) {
cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
} else {
cmd.arg = 0;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_BCR;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
}
err = mmc_wait_for_cmd(host, &cmd, 0);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
/* Check that card supported application commands */
- if (!(cmd.resp[0] & R1_APP_CMD))
- return MMC_ERR_FAILED;
+ if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
+ return -EOPNOTSUPP;
- return MMC_ERR_NONE;
+ return 0;
}
/**
@@ -73,7 +72,7 @@ int mmc_wait_for_app_cmd(struct mmc_host
BUG_ON(!cmd);
BUG_ON(retries < 0);
- err = MMC_ERR_INVALID;
+ err = -EIO;
/*
* We have to resend MMC_APP_CMD for each attempt so
@@ -83,8 +82,14 @@ int mmc_wait_for_app_cmd(struct mmc_host
memset(&mrq, 0, sizeof(struct mmc_request));
err = mmc_app_cmd(host, card);
- if (err != MMC_ERR_NONE)
+ if (err) {
+ /* no point in retrying; no APP commands allowed */
+ if (mmc_host_is_spi(host)) {
+ if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
+ break;
+ }
continue;
+ }
memset(&mrq, 0, sizeof(struct mmc_request));
@@ -97,8 +102,14 @@ int mmc_wait_for_app_cmd(struct mmc_host
mmc_wait_for_req(host, &mrq);
err = cmd->error;
- if (cmd->error == MMC_ERR_NONE)
+ if (!cmd->error)
break;
+
+ /* no point in retrying illegal APP commands */
+ if (mmc_host_is_spi(host)) {
+ if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
+ break;
+ }
}
return err;
@@ -127,14 +138,14 @@ int mmc_app_set_bus_width(struct mmc_car
cmd.arg = SD_BUS_WIDTH_4;
break;
default:
- return MMC_ERR_INVALID;
+ return -EINVAL;
}
err = mmc_wait_for_app_cmd(card->host, card, &cmd, MMC_CMD_RETRIES);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
- return MMC_ERR_NONE;
+ return 0;
}
int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
@@ -147,23 +158,36 @@ int mmc_send_app_op_cond(struct mmc_host
memset(&cmd, 0, sizeof(struct mmc_command));
cmd.opcode = SD_APP_OP_COND;
- cmd.arg = ocr;
- cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
+ if (mmc_host_is_spi(host))
+ cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
+ else
+ cmd.arg = ocr;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
for (i = 100; i; i--) {
err = mmc_wait_for_app_cmd(host, NULL, &cmd, MMC_CMD_RETRIES);
- if (err != MMC_ERR_NONE)
+ if (err)
break;
- if (cmd.resp[0] & MMC_CARD_BUSY || ocr == 0)
+ /* if we're just probing, do a single pass */
+ if (ocr == 0)
break;
- err = MMC_ERR_TIMEOUT;
+ /* otherwise wait until reset completes */
+ if (mmc_host_is_spi(host)) {
+ if (!(cmd.resp[0] & R1_SPI_IDLE))
+ break;
+ } else {
+ if (cmd.resp[0] & MMC_CARD_BUSY)
+ break;
+ }
+
+ err = -ETIMEDOUT;
mmc_delay(10);
}
- if (rocr)
+ if (rocr && !mmc_host_is_spi(host))
*rocr = cmd.resp[0];
return err;
@@ -174,6 +198,7 @@ int mmc_send_if_cond(struct mmc_host *ho
struct mmc_command cmd;
int err;
static const u8 test_pattern = 0xAA;
+ u8 result_pattern;
/*
* To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
@@ -182,16 +207,21 @@ int mmc_send_if_cond(struct mmc_host *ho
*/
cmd.opcode = SD_SEND_IF_COND;
cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
- cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
+ cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
err = mmc_wait_for_cmd(host, &cmd, 0);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
- if ((cmd.resp[0] & 0xFF) != test_pattern)
- return MMC_ERR_FAILED;
+ if (mmc_host_is_spi(host))
+ result_pattern = cmd.resp[1] & 0xFF;
+ else
+ result_pattern = cmd.resp[0] & 0xFF;
+
+ if (result_pattern != test_pattern)
+ return -EIO;
- return MMC_ERR_NONE;
+ return 0;
}
int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
@@ -209,12 +239,12 @@ int mmc_send_relative_addr(struct mmc_ho
cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
*rca = cmd.resp[0] >> 16;
- return MMC_ERR_NONE;
+ return 0;
}
int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
@@ -229,8 +259,10 @@ int mmc_app_send_scr(struct mmc_card *ca
BUG_ON(!card->host);
BUG_ON(!scr);
+ /* NOTE: caller guarantees scr is heap-allocated */
+
err = mmc_app_cmd(card->host, card);
- if (err != MMC_ERR_NONE)
+ if (err)
return err;
memset(&mrq, 0, sizeof(struct mmc_request));
@@ -242,7 +274,7 @@ int mmc_app_send_scr(struct mmc_card *ca
cmd.opcode = SD_APP_SEND_SCR;
cmd.arg = 0;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
data.blksz = 8;
data.blocks = 1;
@@ -252,19 +284,19 @@ int mmc_app_send_scr(struct mmc_card *ca
sg_init_one(&sg, scr, 8);
- mmc_set_data_timeout(&data, card, 0);
+ mmc_set_data_timeout(&data, card);
mmc_wait_for_req(card->host, &mrq);
- if (cmd.error != MMC_ERR_NONE)
+ if (cmd.error)
return cmd.error;
- if (data.error != MMC_ERR_NONE)
+ if (data.error)
return data.error;
- scr[0] = ntohl(scr[0]);
- scr[1] = ntohl(scr[1]);
+ scr[0] = be32_to_cpu(scr[0]);
+ scr[1] = be32_to_cpu(scr[1]);
- return MMC_ERR_NONE;
+ return 0;
}
int mmc_sd_switch(struct mmc_card *card, int mode, int group,
@@ -278,6 +310,8 @@ int mmc_sd_switch(struct mmc_card *card,
BUG_ON(!card);
BUG_ON(!card->host);
+ /* NOTE: caller guarantees resp is heap-allocated */
+
mode = !!mode;
value &= 0xF;
@@ -292,7 +326,7 @@ int mmc_sd_switch(struct mmc_card *card,
cmd.arg = mode << 31 | 0x00FFFFFF;
cmd.arg &= ~(0xF << (group * 4));
cmd.arg |= value << (group * 4);
- cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
data.blksz = 64;
data.blocks = 1;
@@ -302,15 +336,15 @@ int mmc_sd_switch(struct mmc_card *card,
sg_init_one(&sg, resp, 64);
- mmc_set_data_timeout(&data, card, 0);
+ mmc_set_data_timeout(&data, card);
mmc_wait_for_req(card->host, &mrq);
- if (cmd.error != MMC_ERR_NONE)
+ if (cmd.error)
return cmd.error;
- if (data.error != MMC_ERR_NONE)
+ if (data.error)
return data.error;
- return MMC_ERR_NONE;
+ return 0;
}
--- /dev/null
+++ b/drivers/mmc/core/sdio.c
@@ -0,0 +1,395 @@
+/*
+ * linux/drivers/mmc/sdio.c
+ *
+ * Copyright 2006-2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#include <linux/err.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "core.h"
+#include "bus.h"
+#include "sdio_bus.h"
+#include "mmc_ops.h"
+#include "sd_ops.h"
+#include "sdio_ops.h"
+#include "sdio_cis.h"
+
+static int sdio_read_fbr(struct sdio_func *func)
+{
+ int ret;
+ unsigned char data;
+
+ ret = mmc_io_rw_direct(func->card, 0, 0,
+ SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF, 0, &data);
+ if (ret)
+ goto out;
+
+ data &= 0x0f;
+
+ if (data == 0x0f) {
+ ret = mmc_io_rw_direct(func->card, 0, 0,
+ SDIO_FBR_BASE(func->num) + SDIO_FBR_STD_IF_EXT, 0, &data);
+ if (ret)
+ goto out;
+ }
+
+ func->class = data;
+
+out:
+ return ret;
+}
+
+static int sdio_init_func(struct mmc_card *card, unsigned int fn)
+{
+ int ret;
+ struct sdio_func *func;
+
+ BUG_ON(fn > SDIO_MAX_FUNCS);
+
+ func = sdio_alloc_func(card);
+ if (IS_ERR(func))
+ return PTR_ERR(func);
+
+ func->num = fn;
+
+ ret = sdio_read_fbr(func);
+ if (ret)
+ goto fail;
+
+ ret = sdio_read_func_cis(func);
+ if (ret)
+ goto fail;
+
+ card->sdio_func[fn - 1] = func;
+
+ return 0;
+
+fail:
+ /*
+ * It is okay to remove the function here even though we hold
+ * the host lock as we haven't registered the device yet.
+ */
+ sdio_remove_func(func);
+ return ret;
+}
+
+static int sdio_read_cccr(struct mmc_card *card)
+{
+ int ret;
+ int cccr_vsn;
+ unsigned char data;
+
+ memset(&card->cccr, 0, sizeof(struct sdio_cccr));
+
+ ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CCCR, 0, &data);
+ if (ret)
+ goto out;
+
+ cccr_vsn = data & 0x0f;
+
+ if (cccr_vsn > SDIO_CCCR_REV_1_20) {
+ printk(KERN_ERR "%s: unrecognised CCCR structure version %d\n",
+ mmc_hostname(card->host), cccr_vsn);
+ return -EINVAL;
+ }
+
+ card->cccr.sdio_vsn = (data & 0xf0) >> 4;
+
+ ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_CAPS, 0, &data);
+ if (ret)
+ goto out;
+
+ if (data & SDIO_CCCR_CAP_SMB)
+ card->cccr.multi_block = 1;
+ if (data & SDIO_CCCR_CAP_LSC)
+ card->cccr.low_speed = 1;
+ if (data & SDIO_CCCR_CAP_4BLS)
+ card->cccr.wide_bus = 1;
+
+ if (cccr_vsn >= SDIO_CCCR_REV_1_10) {
+ ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_POWER, 0, &data);
+ if (ret)
+ goto out;
+
+ if (data & SDIO_POWER_SMPC)
+ card->cccr.high_power = 1;
+ }
+
+ if (cccr_vsn >= SDIO_CCCR_REV_1_20) {
+ ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &data);
+ if (ret)
+ goto out;
+
+ if (data & SDIO_SPEED_SHS)
+ card->cccr.high_speed = 1;
+ }
+
+out:
+ return ret;
+}
+
+static int sdio_enable_wide(struct mmc_card *card)
+{
+ int ret;
+ u8 ctrl;
+
+ if (!(card->host->caps & MMC_CAP_4_BIT_DATA))
+ return 0;
+
+ if (card->cccr.low_speed && !card->cccr.wide_bus)
+ return 0;
+
+ ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_IF, 0, &ctrl);
+ if (ret)
+ return ret;
+
+ ctrl |= SDIO_BUS_WIDTH_4BIT;
+
+ ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
+ if (ret)
+ return ret;
+
+ mmc_set_bus_width(card->host, MMC_BUS_WIDTH_4);
+
+ return 0;
+}
+
+/*
+ * Host is being removed. Free up the current card.
+ */
+static void mmc_sdio_remove(struct mmc_host *host)
+{
+ int i;
+
+ BUG_ON(!host);
+ BUG_ON(!host->card);
+
+ for (i = 0;i < host->card->sdio_funcs;i++) {
+ if (host->card->sdio_func[i]) {
+ sdio_remove_func(host->card->sdio_func[i]);
+ host->card->sdio_func[i] = NULL;
+ }
+ }
+
+ mmc_remove_card(host->card);
+ host->card = NULL;
+}
+
+/*
+ * Card detection callback from host.
+ */
+static void mmc_sdio_detect(struct mmc_host *host)
+{
+ int err;
+
+ BUG_ON(!host);
+ BUG_ON(!host->card);
+
+ mmc_claim_host(host);
+
+ /*
+ * Just check if our card has been removed.
+ */
+ err = mmc_select_card(host->card);
+
+ mmc_release_host(host);
+
+ if (err) {
+ mmc_sdio_remove(host);
+
+ mmc_claim_host(host);
+ mmc_detach_bus(host);
+ mmc_release_host(host);
+ }
+}
+
+
+static const struct mmc_bus_ops mmc_sdio_ops = {
+ .remove = mmc_sdio_remove,
+ .detect = mmc_sdio_detect,
+};
+
+
+/*
+ * Starting point for SDIO card init.
+ */
+int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
+{
+ int err;
+ int i, funcs;
+ struct mmc_card *card;
+
+ BUG_ON(!host);
+ WARN_ON(!host->claimed);
+
+ mmc_attach_bus(host, &mmc_sdio_ops);
+
+ /*
+ * Sanity check the voltages that the card claims to
+ * support.
+ */
+ if (ocr & 0x7F) {
+ printk(KERN_WARNING "%s: card claims to support voltages "
+ "below the defined range. These will be ignored.\n",
+ mmc_hostname(host));
+ ocr &= ~0x7F;
+ }
+
+ if (ocr & MMC_VDD_165_195) {
+ printk(KERN_WARNING "%s: SDIO card claims to support the "
+ "incompletely defined 'low voltage range'. This "
+ "will be ignored.\n", mmc_hostname(host));
+ ocr &= ~MMC_VDD_165_195;
+ }
+
+ host->ocr = mmc_select_voltage(host, ocr);
+
+ /*
+ * Can we support the voltage(s) of the card(s)?
+ */
+ if (!host->ocr) {
+ err = -EINVAL;
+ goto err;
+ }
+
+ /*
+ * Inform the card of the voltage
+ */
+ err = mmc_send_io_op_cond(host, host->ocr, &ocr);
+ if (err)
+ goto err;
+
+ /*
+ * For SPI, enable CRC as appropriate.
+ */
+ if (mmc_host_is_spi(host)) {
+ err = mmc_spi_set_crc(host, use_spi_crc);
+ if (err)
+ goto err;
+ }
+
+ /*
+ * The number of functions on the card is encoded inside
+ * the ocr.
+ */
+ funcs = (ocr & 0x70000000) >> 28;
+
+ /*
+ * Allocate card structure.
+ */
+ card = mmc_alloc_card(host);
+ if (IS_ERR(card)) {
+ err = PTR_ERR(card);
+ goto err;
+ }
+
+ card->type = MMC_TYPE_SDIO;
+ card->sdio_funcs = funcs;
+
+ host->card = card;
+
+ /*
+ * For native busses: set card RCA and quit open drain mode.
+ */
+ if (!mmc_host_is_spi(host)) {
+ err = mmc_send_relative_addr(host, &card->rca);
+ if (err)
+ goto remove;
+
+ mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
+ }
+
+ /*
+ * Select card, as all following commands rely on that.
+ */
+ if (!mmc_host_is_spi(host)) {
+ err = mmc_select_card(card);
+ if (err)
+ goto remove;
+ }
+
+ /*
+ * Read the common registers.
+ */
+ err = sdio_read_cccr(card);
+ if (err)
+ goto remove;
+
+ /*
+ * Read the common CIS tuples.
+ */
+ err = sdio_read_common_cis(card);
+ if (err)
+ goto remove;
+
+ /*
+ * No support for high-speed yet, so just set
+ * the card's maximum speed.
+ */
+ mmc_set_clock(host, card->cis.max_dtr);
+
+ /*
+ * Switch to wider bus (if supported).
+ */
+ err = sdio_enable_wide(card);
+ if (err)
+ goto remove;
+
+ /*
+ * Initialize (but don't add) all present functions.
+ */
+ for (i = 0;i < funcs;i++) {
+ err = sdio_init_func(host->card, i + 1);
+ if (err)
+ goto remove;
+ }
+
+ mmc_release_host(host);
+
+ /*
+ * First add the card to the driver model...
+ */
+ err = mmc_add_card(host->card);
+ if (err)
+ goto remove_added;
+
+ /*
+ * ...then the SDIO functions.
+ */
+ for (i = 0;i < funcs;i++) {
+ err = sdio_add_func(host->card->sdio_func[i]);
+ if (err)
+ goto remove_added;
+ }
+
+ return 0;
+
+
+remove_added:
+ /* Remove without lock if the device has been added. */
+ mmc_sdio_remove(host);
+ mmc_claim_host(host);
+remove:
+ /* And with lock if it hasn't been added. */
+ if (host->card)
+ mmc_sdio_remove(host);
+err:
+ mmc_detach_bus(host);
+ mmc_release_host(host);
+
+ printk(KERN_ERR "%s: error %d whilst initialising SDIO card\n",
+ mmc_hostname(host), err);
+
+ return err;
+}
+
--- /dev/null
+++ b/drivers/mmc/core/sdio_bus.c
@@ -0,0 +1,265 @@
+/*
+ * linux/drivers/mmc/core/sdio_bus.c
+ *
+ * Copyright 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * SDIO function driver model
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "sdio_cis.h"
+#include "sdio_bus.h"
+
+#define dev_to_sdio_func(d) container_of(d, struct sdio_func, dev)
+#define to_sdio_driver(d) container_of(d, struct sdio_driver, drv)
+
+/* show configuration fields */
+#define sdio_config_attr(field, format_string) \
+static ssize_t \
+field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+ struct sdio_func *func; \
+ \
+ func = dev_to_sdio_func (dev); \
+ return sprintf (buf, format_string, func->field); \
+}
+
+sdio_config_attr(class, "0x%02x\n");
+sdio_config_attr(vendor, "0x%04x\n");
+sdio_config_attr(device, "0x%04x\n");
+
+static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct sdio_func *func = dev_to_sdio_func (dev);
+
+ return sprintf(buf, "sdio:c%02Xv%04Xd%04X\n",
+ func->class, func->vendor, func->device);
+}
+
+static struct device_attribute sdio_dev_attrs[] = {
+ __ATTR_RO(class),
+ __ATTR_RO(vendor),
+ __ATTR_RO(device),
+ __ATTR_RO(modalias),
+ __ATTR_NULL,
+};
+
+static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
+ const struct sdio_device_id *id)
+{
+ if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
+ return NULL;
+ if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
+ return NULL;
+ if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
+ return NULL;
+ return id;
+}
+
+static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
+ struct sdio_driver *sdrv)
+{
+ const struct sdio_device_id *ids;
+
+ ids = sdrv->id_table;
+
+ if (ids) {
+ while (ids->class || ids->vendor || ids->device) {
+ if (sdio_match_one(func, ids))
+ return ids;
+ ids++;
+ }
+ }
+
+ return NULL;
+}
+
+static int sdio_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct sdio_func *func = dev_to_sdio_func(dev);
+ struct sdio_driver *sdrv = to_sdio_driver(drv);
+
+ if (sdio_match_device(func, sdrv))
+ return 1;
+
+ return 0;
+}
+
+static int
+sdio_bus_uevent(struct device *dev, char **envp,
+ int num_envp, char *buffer, int buffer_size)
+{
+ struct sdio_func *func = dev_to_sdio_func(dev);
+ int i = 0, len = 0;
+
+ if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
+ "SDIO_CLASS=%02X", func->class))
+ return -ENOMEM;
+
+ if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
+ "SDIO_ID=%04X:%04X", func->vendor, func->device))
+ return -ENOMEM;
+
+ if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
+ "MODALIAS=sdio:c%02Xv%04Xd%04X",
+ func->class, func->vendor, func->device))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int sdio_bus_probe(struct device *dev)
+{
+ struct sdio_driver *drv = to_sdio_driver(dev->driver);
+ struct sdio_func *func = dev_to_sdio_func(dev);
+ const struct sdio_device_id *id;
+ int ret;
+
+ id = sdio_match_device(func, drv);
+ if (!id)
+ return -ENODEV;
+
+ /* Set the default block size so the driver is sure it's something
+ * sensible. */
+ sdio_claim_host(func);
+ ret = sdio_set_block_size(func, 0);
+ sdio_release_host(func);
+ if (ret)
+ return ret;
+
+ return drv->probe(func, id);
+}
+
+static int sdio_bus_remove(struct device *dev)
+{
+ struct sdio_driver *drv = to_sdio_driver(dev->driver);
+ struct sdio_func *func = dev_to_sdio_func(dev);
+
+ drv->remove(func);
+
+ if (func->irq_handler) {
+ printk(KERN_WARNING "WARNING: driver %s did not remove "
+ "its interrupt handler!\n", drv->name);
+ sdio_claim_host(func);
+ sdio_release_irq(func);
+ sdio_release_host(func);
+ }
+
+ return 0;
+}
+
+static struct bus_type sdio_bus_type = {
+ .name = "sdio",
+ .dev_attrs = sdio_dev_attrs,
+ .match = sdio_bus_match,
+ .uevent = sdio_bus_uevent,
+ .probe = sdio_bus_probe,
+ .remove = sdio_bus_remove,
+};
+
+int sdio_register_bus(void)
+{
+ return bus_register(&sdio_bus_type);
+}
+
+void sdio_unregister_bus(void)
+{
+ bus_unregister(&sdio_bus_type);
+}
+
+/**
+ * sdio_register_driver - register a function driver
+ * @drv: SDIO function driver
+ */
+int sdio_register_driver(struct sdio_driver *drv)
+{
+ drv->drv.name = drv->name;
+ drv->drv.bus = &sdio_bus_type;
+ return driver_register(&drv->drv);
+}
+EXPORT_SYMBOL_GPL(sdio_register_driver);
+
+/**
+ * sdio_unregister_driver - unregister a function driver
+ * @drv: SDIO function driver
+ */
+void sdio_unregister_driver(struct sdio_driver *drv)
+{
+ drv->drv.bus = &sdio_bus_type;
+ driver_unregister(&drv->drv);
+}
+EXPORT_SYMBOL_GPL(sdio_unregister_driver);
+
+static void sdio_release_func(struct device *dev)
+{
+ struct sdio_func *func = dev_to_sdio_func(dev);
+
+ sdio_free_func_cis(func);
+
+ if (func->info)
+ kfree(func->info);
+
+ kfree(func);
+}
+
+/*
+ * Allocate and initialise a new SDIO function structure.
+ */
+struct sdio_func *sdio_alloc_func(struct mmc_card *card)
+{
+ struct sdio_func *func;
+
+ func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
+ if (!func)
+ return ERR_PTR(-ENOMEM);
+
+ func->card = card;
+
+ device_initialize(&func->dev);
+
+ func->dev.parent = &card->dev;
+ func->dev.bus = &sdio_bus_type;
+ func->dev.release = sdio_release_func;
+
+ return func;
+}
+
+/*
+ * Register a new SDIO function with the driver model.
+ */
+int sdio_add_func(struct sdio_func *func)
+{
+ int ret;
+
+ snprintf(func->dev.bus_id, sizeof(func->dev.bus_id),
+ "%s:%d", mmc_card_id(func->card), func->num);
+
+ ret = device_add(&func->dev);
+ if (ret == 0)
+ sdio_func_set_present(func);
+
+ return ret;
+}
+
+/*
+ * Unregister a SDIO function with the driver model, and
+ * (eventually) free it.
+ */
+void sdio_remove_func(struct sdio_func *func)
+{
+ if (sdio_func_present(func))
+ device_del(&func->dev);
+
+ put_device(&func->dev);
+}
+
--- /dev/null
+++ b/drivers/mmc/core/sdio_bus.h
@@ -0,0 +1,22 @@
+/*
+ * linux/drivers/mmc/core/sdio_bus.h
+ *
+ * Copyright 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+#ifndef _MMC_CORE_SDIO_BUS_H
+#define _MMC_CORE_SDIO_BUS_H
+
+struct sdio_func *sdio_alloc_func(struct mmc_card *card);
+int sdio_add_func(struct sdio_func *func);
+void sdio_remove_func(struct sdio_func *func);
+
+int sdio_register_bus(void);
+void sdio_unregister_bus(void);
+
+#endif
+
--- /dev/null
+++ b/drivers/mmc/core/sdio_cis.c
@@ -0,0 +1,346 @@
+/*
+ * linux/drivers/mmc/core/sdio_cis.c
+ *
+ * Author: Nicolas Pitre
+ * Created: June 11, 2007
+ * Copyright: MontaVista Software Inc.
+ *
+ * Copyright 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#include <linux/kernel.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "sdio_cis.h"
+#include "sdio_ops.h"
+
+static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
+ const unsigned char *buf, unsigned size)
+{
+ unsigned i, nr_strings;
+ char **buffer, *string;
+
+ buf += 2;
+ size -= 2;
+
+ nr_strings = 0;
+ for (i = 0; i < size; i++) {
+ if (buf[i] == 0xff)
+ break;
+ if (buf[i] == 0)
+ nr_strings++;
+ }
+
+ if (buf[i-1] != '\0') {
+ printk(KERN_WARNING "SDIO: ignoring broken CISTPL_VERS_1\n");
+ return 0;
+ }
+
+ size = i;
+
+ buffer = kzalloc(sizeof(char*) * nr_strings + size, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ string = (char*)(buffer + nr_strings);
+
+ for (i = 0; i < nr_strings; i++) {
+ buffer[i] = string;
+ strcpy(string, buf);
+ string += strlen(string) + 1;
+ buf += strlen(buf) + 1;
+ }
+
+ if (func) {
+ func->num_info = nr_strings;
+ func->info = (const char**)buffer;
+ } else {
+ card->num_info = nr_strings;
+ card->info = (const char**)buffer;
+ }
+
+ return 0;
+}
+
+static int cistpl_manfid(struct mmc_card *card, struct sdio_func *func,
+ const unsigned char *buf, unsigned size)
+{
+ unsigned int vendor, device;
+
+ /* TPLMID_MANF */
+ vendor = buf[0] | (buf[1] << 8);
+
+ /* TPLMID_CARD */
+ device = buf[2] | (buf[3] << 8);
+
+ if (func) {
+ func->vendor = vendor;
+ func->device = device;
+ } else {
+ card->cis.vendor = vendor;
+ card->cis.device = device;
+ }
+
+ return 0;
+}
+
+static const unsigned char speed_val[16] =
+ { 0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80 };
+static const unsigned int speed_unit[8] =
+ { 10000, 100000, 1000000, 10000000, 0, 0, 0, 0 };
+
+static int cistpl_funce_common(struct mmc_card *card,
+ const unsigned char *buf, unsigned size)
+{
+ if (size < 0x04 || buf[0] != 0)
+ return -EINVAL;
+
+ /* TPLFE_FN0_BLK_SIZE */
+ card->cis.blksize = buf[1] | (buf[2] << 8);
+
+ /* TPLFE_MAX_TRAN_SPEED */
+ card->cis.max_dtr = speed_val[(buf[3] >> 3) & 15] *
+ speed_unit[buf[3] & 7];
+
+ return 0;
+}
+
+static int cistpl_funce_func(struct sdio_func *func,
+ const unsigned char *buf, unsigned size)
+{
+ unsigned vsn;
+ unsigned min_size;
+
+ vsn = func->card->cccr.sdio_vsn;
+ min_size = (vsn == SDIO_SDIO_REV_1_00) ? 28 : 42;
+
+ if (size < min_size || buf[0] != 1)
+ return -EINVAL;
+
+ /* TPLFE_MAX_BLK_SIZE */
+ func->max_blksize = buf[12] | (buf[13] << 8);
+
+ return 0;
+}
+
+static int cistpl_funce(struct mmc_card *card, struct sdio_func *func,
+ const unsigned char *buf, unsigned size)
+{
+ int ret;
+
+ /*
+ * There should be two versions of the CISTPL_FUNCE tuple,
+ * one for the common CIS (function 0) and a version used by
+ * the individual function's CIS (1-7). Yet, the later has a
+ * different length depending on the SDIO spec version.
+ */
+ if (func)
+ ret = cistpl_funce_func(func, buf, size);
+ else
+ ret = cistpl_funce_common(card, buf, size);
+
+ if (ret) {
+ printk(KERN_ERR "%s: bad CISTPL_FUNCE size %u "
+ "type %u\n", mmc_hostname(card->host), size, buf[0]);
+ return ret;
+ }
+
+ return 0;
+}
+
+typedef int (tpl_parse_t)(struct mmc_card *, struct sdio_func *,
+ const unsigned char *, unsigned);
+
+struct cis_tpl {
+ unsigned char code;
+ unsigned char min_size;
+ tpl_parse_t *parse;
+};
+
+static const struct cis_tpl cis_tpl_list[] = {
+ { 0x15, 3, cistpl_vers_1 },
+ { 0x20, 4, cistpl_manfid },
+ { 0x21, 2, /* cistpl_funcid */ },
+ { 0x22, 0, cistpl_funce },
+};
+
+static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
+{
+ int ret;
+ struct sdio_func_tuple *this, **prev;
+ unsigned i, ptr = 0;
+
+ /*
+ * Note that this works for the common CIS (function number 0) as
+ * well as a function's CIS * since SDIO_CCCR_CIS and SDIO_FBR_CIS
+ * have the same offset.
+ */
+ for (i = 0; i < 3; i++) {
+ unsigned char x, fn;
+
+ if (func)
+ fn = func->num;
+ else
+ fn = 0;
+
+ ret = mmc_io_rw_direct(card, 0, 0,
+ SDIO_FBR_BASE(fn) + SDIO_FBR_CIS + i, 0, &x);
+ if (ret)
+ return ret;
+ ptr |= x << (i * 8);
+ }
+
+ if (func)
+ prev = &func->tuples;
+ else
+ prev = &card->tuples;
+
+ BUG_ON(*prev);
+
+ do {
+ unsigned char tpl_code, tpl_link;
+
+ ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code);
+ if (ret)
+ break;
+
+ /* 0xff means we're done */
+ if (tpl_code == 0xff)
+ break;
+
+ ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_link);
+ if (ret)
+ break;
+
+ this = kmalloc(sizeof(*this) + tpl_link, GFP_KERNEL);
+ if (!this)
+ return -ENOMEM;
+
+ for (i = 0; i < tpl_link; i++) {
+ ret = mmc_io_rw_direct(card, 0, 0,
+ ptr + i, 0, &this->data[i]);
+ if (ret)
+ break;
+ }
+ if (ret) {
+ kfree(this);
+ break;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(cis_tpl_list); i++)
+ if (cis_tpl_list[i].code == tpl_code)
+ break;
+ if (i >= ARRAY_SIZE(cis_tpl_list)) {
+ /* this tuple is unknown to the core */
+ this->next = NULL;
+ this->code = tpl_code;
+ this->size = tpl_link;
+ *prev = this;
+ prev = &this->next;
+ printk(KERN_DEBUG
+ "%s: queuing CIS tuple 0x%02x length %u\n",
+ mmc_hostname(card->host), tpl_code, tpl_link);
+ } else {
+ const struct cis_tpl *tpl = cis_tpl_list + i;
+ if (tpl_link < tpl->min_size) {
+ printk(KERN_ERR
+ "%s: bad CIS tuple 0x%02x (length = %u, expected >= %u)\n",
+ mmc_hostname(card->host),
+ tpl_code, tpl_link, tpl->min_size);
+ ret = -EINVAL;
+ } else if (tpl->parse) {
+ ret = tpl->parse(card, func,
+ this->data, tpl_link);
+ }
+ kfree(this);
+ }
+
+ ptr += tpl_link;
+ } while (!ret);
+
+ /*
+ * Link in all unknown tuples found in the common CIS so that
+ * drivers don't have to go digging in two places.
+ */
+ if (func)
+ *prev = card->tuples;
+
+ return ret;
+}
+
+int sdio_read_common_cis(struct mmc_card *card)
+{
+ return sdio_read_cis(card, NULL);
+}
+
+void sdio_free_common_cis(struct mmc_card *card)
+{
+ struct sdio_func_tuple *tuple, *victim;
+
+ tuple = card->tuples;
+
+ while (tuple) {
+ victim = tuple;
+ tuple = tuple->next;
+ kfree(victim);
+ }
+
+ card->tuples = NULL;
+}
+
+int sdio_read_func_cis(struct sdio_func *func)
+{
+ int ret;
+
+ ret = sdio_read_cis(func->card, func);
+ if (ret)
+ return ret;
+
+ /*
+ * Since we've linked to tuples in the card structure,
+ * we must make sure we have a reference to it.
+ */
+ get_device(&func->card->dev);
+
+ /*
+ * Vendor/device id is optional for function CIS, so
+ * copy it from the card structure as needed.
+ */
+ if (func->vendor == 0) {
+ func->vendor = func->card->cis.vendor;
+ func->device = func->card->cis.device;
+ }
+
+ return 0;
+}
+
+void sdio_free_func_cis(struct sdio_func *func)
+{
+ struct sdio_func_tuple *tuple, *victim;
+
+ tuple = func->tuples;
+
+ while (tuple && tuple != func->card->tuples) {
+ victim = tuple;
+ tuple = tuple->next;
+ kfree(victim);
+ }
+
+ func->tuples = NULL;
+
+ /*
+ * We have now removed the link to the tuples in the
+ * card structure, so remove the reference.
+ */
+ put_device(&func->card->dev);
+}
+
--- /dev/null
+++ b/drivers/mmc/core/sdio_cis.h
@@ -0,0 +1,23 @@
+/*
+ * linux/drivers/mmc/core/sdio_cis.h
+ *
+ * Author: Nicolas Pitre
+ * Created: June 11, 2007
+ * Copyright: MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#ifndef _MMC_SDIO_CIS_H
+#define _MMC_SDIO_CIS_H
+
+int sdio_read_common_cis(struct mmc_card *card);
+void sdio_free_common_cis(struct mmc_card *card);
+
+int sdio_read_func_cis(struct sdio_func *func);
+void sdio_free_func_cis(struct sdio_func *func);
+
+#endif
--- /dev/null
+++ b/drivers/mmc/core/sdio_io.c
@@ -0,0 +1,548 @@
+/*
+ * linux/drivers/mmc/core/sdio_io.c
+ *
+ * Copyright 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "sdio_ops.h"
+
+/**
+ * sdio_claim_host - exclusively claim a bus for a certain SDIO function
+ * @func: SDIO function that will be accessed
+ *
+ * Claim a bus for a set of operations. The SDIO function given
+ * is used to figure out which bus is relevant.
+ */
+void sdio_claim_host(struct sdio_func *func)
+{
+ BUG_ON(!func);
+ BUG_ON(!func->card);
+
+ mmc_claim_host(func->card->host);
+}
+EXPORT_SYMBOL_GPL(sdio_claim_host);
+
+/**
+ * sdio_release_host - release a bus for a certain SDIO function
+ * @func: SDIO function that was accessed
+ *
+ * Release a bus, allowing others to claim the bus for their
+ * operations.
+ */
+void sdio_release_host(struct sdio_func *func)
+{
+ BUG_ON(!func);
+ BUG_ON(!func->card);
+
+ mmc_release_host(func->card->host);
+}
+EXPORT_SYMBOL_GPL(sdio_release_host);
+
+/**
+ * sdio_enable_func - enables a SDIO function for usage
+ * @func: SDIO function to enable
+ *
+ * Powers up and activates a SDIO function so that register
+ * access is possible.
+ */
+int sdio_enable_func(struct sdio_func *func)
+{
+ int ret;
+ unsigned char reg;
+ unsigned long timeout;
+
+ BUG_ON(!func);
+ BUG_ON(!func->card);
+
+ pr_debug("SDIO: Enabling device %s...\n", sdio_func_id(func));
+
+ ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, &reg);
+ if (ret)
+ goto err;
+
+ reg |= 1 << func->num;
+
+ ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
+ if (ret)
+ goto err;
+
+ /*
+ * FIXME: This should timeout based on information in the CIS,
+ * but we don't have card to parse that yet.
+ */
+ timeout = jiffies + HZ;
+
+ while (1) {
+ ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IORx, 0, &reg);
+ if (ret)
+ goto err;
+ if (reg & (1 << func->num))
+ break;
+ ret = -ETIME;
+ if (time_after(jiffies, timeout))
+ goto err;
+ }
+
+ pr_debug("SDIO: Enabled device %s\n", sdio_func_id(func));
+
+ return 0;
+
+err:
+ pr_debug("SDIO: Failed to enable device %s\n", sdio_func_id(func));
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sdio_enable_func);
+
+/**
+ * sdio_disable_func - disable a SDIO function
+ * @func: SDIO function to disable
+ *
+ * Powers down and deactivates a SDIO function. Register access
+ * to this function will fail until the function is reenabled.
+ */
+int sdio_disable_func(struct sdio_func *func)
+{
+ int ret;
+ unsigned char reg;
+
+ BUG_ON(!func);
+ BUG_ON(!func->card);
+
+ pr_debug("SDIO: Disabling device %s...\n", sdio_func_id(func));
+
+ ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IOEx, 0, &reg);
+ if (ret)
+ goto err;
+
+ reg &= ~(1 << func->num);
+
+ ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IOEx, reg, NULL);
+ if (ret)
+ goto err;
+
+ pr_debug("SDIO: Disabled device %s\n", sdio_func_id(func));
+
+ return 0;
+
+err:
+ pr_debug("SDIO: Failed to disable device %s\n", sdio_func_id(func));
+ return -EIO;
+}
+EXPORT_SYMBOL_GPL(sdio_disable_func);
+
+/**
+ * sdio_set_block_size - set the block size of an SDIO function
+ * @func: SDIO function to change
+ * @blksz: new block size or 0 to use the default.
+ *
+ * The default block size is the largest supported by both the function
+ * and the host, with a maximum of 512 to ensure that arbitrarily sized
+ * data transfer use the optimal (least) number of commands.
+ *
+ * A driver may call this to override the default block size set by the
+ * core. This can be used to set a block size greater than the maximum
+ * that reported by the card; it is the driver's responsibility to ensure
+ * it uses a value that the card supports.
+ *
+ * Returns 0 on success, -EINVAL if the host does not support the
+ * requested block size, or -EIO (etc.) if one of the resultant FBR block
+ * size register writes failed.
+ *
+ */
+int sdio_set_block_size(struct sdio_func *func, unsigned blksz)
+{
+ int ret;
+
+ if (blksz > func->card->host->max_blk_size)
+ return -EINVAL;
+
+ if (blksz == 0) {
+ blksz = min(min(
+ func->max_blksize,
+ func->card->host->max_blk_size),
+ 512u);
+ }
+
+ ret = mmc_io_rw_direct(func->card, 1, 0,
+ SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE,
+ blksz & 0xff, NULL);
+ if (ret)
+ return ret;
+ ret = mmc_io_rw_direct(func->card, 1, 0,
+ SDIO_FBR_BASE(func->num) + SDIO_FBR_BLKSIZE + 1,
+ (blksz >> 8) & 0xff, NULL);
+ if (ret)
+ return ret;
+ func->cur_blksize = blksz;
+ return 0;
+}
+
+EXPORT_SYMBOL_GPL(sdio_set_block_size);
+
+/* Split an arbitrarily sized data transfer into several
+ * IO_RW_EXTENDED commands. */
+static int sdio_io_rw_ext_helper(struct sdio_func *func, int write,
+ unsigned addr, int incr_addr, u8 *buf, unsigned size)
+{
+ unsigned remainder = size;
+ unsigned max_blocks;
+ int ret;
+
+ /* Do the bulk of the transfer using block mode (if supported). */
+ if (func->card->cccr.multi_block) {
+ /* Blocks per command is limited by host count, host transfer
+ * size (we only use a single sg entry) and the maximum for
+ * IO_RW_EXTENDED of 511 blocks. */
+ max_blocks = min(min(
+ func->card->host->max_blk_count,
+ func->card->host->max_seg_size / func->cur_blksize),
+ 511u);
+
+ while (remainder > func->cur_blksize) {
+ unsigned blocks;
+
+ blocks = remainder / func->cur_blksize;
+ if (blocks > max_blocks)
+ blocks = max_blocks;
+ size = blocks * func->cur_blksize;
+
+ ret = mmc_io_rw_extended(func->card, write,
+ func->num, addr, incr_addr, buf,
+ blocks, func->cur_blksize);
+ if (ret)
+ return ret;
+
+ remainder -= size;
+ buf += size;
+ if (incr_addr)
+ addr += size;
+ }
+ }
+
+ /* Write the remainder using byte mode. */
+ while (remainder > 0) {
+ size = remainder;
+ if (size > func->cur_blksize)
+ size = func->cur_blksize;
+ if (size > 512)
+ size = 512; /* maximum size for byte mode */
+
+ ret = mmc_io_rw_extended(func->card, write, func->num, addr,
+ incr_addr, buf, 1, size);
+ if (ret)
+ return ret;
+
+ remainder -= size;
+ buf += size;
+ if (incr_addr)
+ addr += size;
+ }
+ return 0;
+}
+
+/**
+ * sdio_readb - read a single byte from a SDIO function
+ * @func: SDIO function to access
+ * @addr: address to read
+ * @err_ret: optional status value from transfer
+ *
+ * Reads a single byte from the address space of a given SDIO
+ * function. If there is a problem reading the address, 0xff
+ * is returned and @err_ret will contain the error code.
+ */
+unsigned char sdio_readb(struct sdio_func *func, unsigned int addr,
+ int *err_ret)
+{
+ int ret;
+ unsigned char val;
+
+ BUG_ON(!func);
+
+ if (err_ret)
+ *err_ret = 0;
+
+ ret = mmc_io_rw_direct(func->card, 0, func->num, addr, 0, &val);
+ if (ret) {
+ if (err_ret)
+ *err_ret = ret;
+ return 0xFF;
+ }
+
+ return val;
+}
+EXPORT_SYMBOL_GPL(sdio_readb);
+
+/**
+ * sdio_writeb - write a single byte to a SDIO function
+ * @func: SDIO function to access
+ * @b: byte to write
+ * @addr: address to write to
+ * @err_ret: optional status value from transfer
+ *
+ * Writes a single byte to the address space of a given SDIO
+ * function. @err_ret will contain the status of the actual
+ * transfer.
+ */
+void sdio_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
+ int *err_ret)
+{
+ int ret;
+
+ BUG_ON(!func);
+
+ ret = mmc_io_rw_direct(func->card, 1, func->num, addr, b, NULL);
+ if (err_ret)
+ *err_ret = ret;
+}
+EXPORT_SYMBOL_GPL(sdio_writeb);
+
+/**
+ * sdio_memcpy_fromio - read a chunk of memory from a SDIO function
+ * @func: SDIO function to access
+ * @dst: buffer to store the data
+ * @addr: address to begin reading from
+ * @count: number of bytes to read
+ *
+ * Reads from the address space of a given SDIO function. Return
+ * value indicates if the transfer succeeded or not.
+ */
+int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
+ unsigned int addr, int count)
+{
+ return sdio_io_rw_ext_helper(func, 0, addr, 1, dst, count);
+}
+EXPORT_SYMBOL_GPL(sdio_memcpy_fromio);
+
+/**
+ * sdio_memcpy_toio - write a chunk of memory to a SDIO function
+ * @func: SDIO function to access
+ * @addr: address to start writing to
+ * @src: buffer that contains the data to write
+ * @count: number of bytes to write
+ *
+ * Writes to the address space of a given SDIO function. Return
+ * value indicates if the transfer succeeded or not.
+ */
+int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
+ void *src, int count)
+{
+ return sdio_io_rw_ext_helper(func, 1, addr, 1, src, count);
+}
+EXPORT_SYMBOL_GPL(sdio_memcpy_toio);
+
+/**
+ * sdio_readsb - read from a FIFO on a SDIO function
+ * @func: SDIO function to access
+ * @dst: buffer to store the data
+ * @addr: address of (single byte) FIFO
+ * @count: number of bytes to read
+ *
+ * Reads from the specified FIFO of a given SDIO function. Return
+ * value indicates if the transfer succeeded or not.
+ */
+int sdio_readsb(struct sdio_func *func, void *dst, unsigned int addr,
+ int count)
+{
+ return sdio_io_rw_ext_helper(func, 0, addr, 0, dst, count);
+}
+
+EXPORT_SYMBOL_GPL(sdio_readsb);
+
+/**
+ * sdio_writesb - write to a FIFO of a SDIO function
+ * @func: SDIO function to access
+ * @addr: address of (single byte) FIFO
+ * @src: buffer that contains the data to write
+ * @count: number of bytes to write
+ *
+ * Writes to the specified FIFO of a given SDIO function. Return
+ * value indicates if the transfer succeeded or not.
+ */
+int sdio_writesb(struct sdio_func *func, unsigned int addr, void *src,
+ int count)
+{
+ return sdio_io_rw_ext_helper(func, 1, addr, 0, src, count);
+}
+EXPORT_SYMBOL_GPL(sdio_writesb);
+
+/**
+ * sdio_readw - read a 16 bit integer from a SDIO function
+ * @func: SDIO function to access
+ * @addr: address to read
+ * @err_ret: optional status value from transfer
+ *
+ * Reads a 16 bit integer from the address space of a given SDIO
+ * function. If there is a problem reading the address, 0xffff
+ * is returned and @err_ret will contain the error code.
+ */
+unsigned short sdio_readw(struct sdio_func *func, unsigned int addr,
+ int *err_ret)
+{
+ int ret;
+
+ if (err_ret)
+ *err_ret = 0;
+
+ ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 2);
+ if (ret) {
+ if (err_ret)
+ *err_ret = ret;
+ return 0xFFFF;
+ }
+
+ return le16_to_cpu(*(u16*)func->tmpbuf);
+}
+EXPORT_SYMBOL_GPL(sdio_readw);
+
+/**
+ * sdio_writew - write a 16 bit integer to a SDIO function
+ * @func: SDIO function to access
+ * @b: integer to write
+ * @addr: address to write to
+ * @err_ret: optional status value from transfer
+ *
+ * Writes a 16 bit integer to the address space of a given SDIO
+ * function. @err_ret will contain the status of the actual
+ * transfer.
+ */
+void sdio_writew(struct sdio_func *func, unsigned short b, unsigned int addr,
+ int *err_ret)
+{
+ int ret;
+
+ *(u16*)func->tmpbuf = cpu_to_le16(b);
+
+ ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 2);
+ if (err_ret)
+ *err_ret = ret;
+}
+EXPORT_SYMBOL_GPL(sdio_writew);
+
+/**
+ * sdio_readl - read a 32 bit integer from a SDIO function
+ * @func: SDIO function to access
+ * @addr: address to read
+ * @err_ret: optional status value from transfer
+ *
+ * Reads a 32 bit integer from the address space of a given SDIO
+ * function. If there is a problem reading the address,
+ * 0xffffffff is returned and @err_ret will contain the error
+ * code.
+ */
+unsigned long sdio_readl(struct sdio_func *func, unsigned int addr,
+ int *err_ret)
+{
+ int ret;
+
+ if (err_ret)
+ *err_ret = 0;
+
+ ret = sdio_memcpy_fromio(func, func->tmpbuf, addr, 4);
+ if (ret) {
+ if (err_ret)
+ *err_ret = ret;
+ return 0xFFFFFFFF;
+ }
+
+ return le32_to_cpu(*(u32*)func->tmpbuf);
+}
+EXPORT_SYMBOL_GPL(sdio_readl);
+
+/**
+ * sdio_writel - write a 32 bit integer to a SDIO function
+ * @func: SDIO function to access
+ * @b: integer to write
+ * @addr: address to write to
+ * @err_ret: optional status value from transfer
+ *
+ * Writes a 32 bit integer to the address space of a given SDIO
+ * function. @err_ret will contain the status of the actual
+ * transfer.
+ */
+void sdio_writel(struct sdio_func *func, unsigned long b, unsigned int addr,
+ int *err_ret)
+{
+ int ret;
+
+ *(u32*)func->tmpbuf = cpu_to_le32(b);
+
+ ret = sdio_memcpy_toio(func, addr, func->tmpbuf, 4);
+ if (err_ret)
+ *err_ret = ret;
+}
+EXPORT_SYMBOL_GPL(sdio_writel);
+
+/**
+ * sdio_f0_readb - read a single byte from SDIO function 0
+ * @func: an SDIO function of the card
+ * @addr: address to read
+ * @err_ret: optional status value from transfer
+ *
+ * Reads a single byte from the address space of SDIO function 0.
+ * If there is a problem reading the address, 0xff is returned
+ * and @err_ret will contain the error code.
+ */
+unsigned char sdio_f0_readb(struct sdio_func *func, unsigned int addr,
+ int *err_ret)
+{
+ int ret;
+ unsigned char val;
+
+ BUG_ON(!func);
+
+ if (err_ret)
+ *err_ret = 0;
+
+ ret = mmc_io_rw_direct(func->card, 0, 0, addr, 0, &val);
+ if (ret) {
+ if (err_ret)
+ *err_ret = ret;
+ return 0xFF;
+ }
+
+ return val;
+}
+EXPORT_SYMBOL_GPL(sdio_f0_readb);
+
+/**
+ * sdio_f0_writeb - write a single byte to SDIO function 0
+ * @func: an SDIO function of the card
+ * @b: byte to write
+ * @addr: address to write to
+ * @err_ret: optional status value from transfer
+ *
+ * Writes a single byte to the address space of SDIO function 0.
+ * @err_ret will contain the status of the actual transfer.
+ *
+ * Only writes to the vendor specific CCCR registers (0xF0 -
+ * 0xFF) are permiited; @err_ret will be set to -EINVAL for *
+ * writes outside this range.
+ */
+void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
+ int *err_ret)
+{
+ int ret;
+
+ BUG_ON(!func);
+
+ if (addr < 0xF0 || addr > 0xFF) {
+ if (err_ret)
+ *err_ret = -EINVAL;
+ return;
+ }
+
+ ret = mmc_io_rw_direct(func->card, 1, 0, addr, b, NULL);
+ if (err_ret)
+ *err_ret = ret;
+}
+EXPORT_SYMBOL_GPL(sdio_f0_writeb);
--- /dev/null
+++ b/drivers/mmc/core/sdio_irq.c
@@ -0,0 +1,267 @@
+/*
+ * linux/drivers/mmc/core/sdio_irq.c
+ *
+ * Author: Nicolas Pitre
+ * Created: June 18, 2007
+ * Copyright: MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kthread.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+
+#include <linux/mmc/core.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio.h>
+#include <linux/mmc/sdio_func.h>
+
+#include "sdio_ops.h"
+
+static int process_sdio_pending_irqs(struct mmc_card *card)
+{
+ int i, ret, count;
+ unsigned char pending;
+
+ ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending);
+ if (ret) {
+ printk(KERN_DEBUG "%s: error %d reading SDIO_CCCR_INTx\n",
+ mmc_card_id(card), ret);
+ return ret;
+ }
+
+ count = 0;
+ for (i = 1; i <= 7; i++) {
+ if (pending & (1 << i)) {
+ struct sdio_func *func = card->sdio_func[i - 1];
+ if (!func) {
+ printk(KERN_WARNING "%s: pending IRQ for "
+ "non-existant function\n",
+ mmc_card_id(card));
+ ret = -EINVAL;
+ } else if (func->irq_handler) {
+ func->irq_handler(func);
+ count++;
+ } else {
+ printk(KERN_WARNING "%s: pending IRQ with no handler\n",
+ sdio_func_id(func));
+ ret = -EINVAL;
+ }
+ }
+ }
+
+ if (count)
+ return count;
+
+ return ret;
+}
+
+static int sdio_irq_thread(void *_host)
+{
+ struct mmc_host *host = _host;
+ struct sched_param param = { .sched_priority = 1 };
+ unsigned long period, idle_period;
+ int ret;
+
+ sched_setscheduler(current, SCHED_FIFO, &param);
+
+ /*
+ * We want to allow for SDIO cards to work even on non SDIO
+ * aware hosts. One thing that non SDIO host cannot do is
+ * asynchronous notification of pending SDIO card interrupts
+ * hence we poll for them in that case.
+ */
+ idle_period = msecs_to_jiffies(10);
+ period = (host->caps & MMC_CAP_SDIO_IRQ) ?
+ MAX_SCHEDULE_TIMEOUT : idle_period;
+
+ pr_debug("%s: IRQ thread started (poll period = %lu jiffies)\n",
+ mmc_hostname(host), period);
+
+ do {
+ /*
+ * We claim the host here on drivers behalf for a couple
+ * reasons:
+ *
+ * 1) it is already needed to retrieve the CCCR_INTx;
+ * 2) we want the driver(s) to clear the IRQ condition ASAP;
+ * 3) we need to control the abort condition locally.
+ *
+ * Just like traditional hard IRQ handlers, we expect SDIO
+ * IRQ handlers to be quick and to the point, so that the
+ * holding of the host lock does not cover too much work
+ * that doesn't require that lock to be held.
+ */
+ ret = __mmc_claim_host(host, &host->sdio_irq_thread_abort);
+ if (ret)
+ break;
+ ret = process_sdio_pending_irqs(host->card);
+ mmc_release_host(host);
+
+ /*
+ * Give other threads a chance to run in the presence of
+ * errors. FIXME: determine if due to card removal and
+ * possibly exit this thread if so.
+ */
+ if (ret < 0)
+ ssleep(1);
+
+ /*
+ * Adaptive polling frequency based on the assumption
+ * that an interrupt will be closely followed by more.
+ * This has a substantial benefit for network devices.
+ */
+ if (!(host->caps & MMC_CAP_SDIO_IRQ)) {
+ if (ret > 0)
+ period /= 2;
+ else {
+ period++;
+ if (period > idle_period)
+ period = idle_period;
+ }
+ }
+
+ set_task_state(current, TASK_INTERRUPTIBLE);
+ if (host->caps & MMC_CAP_SDIO_IRQ)
+ host->ops->enable_sdio_irq(host, 1);
+ if (!kthread_should_stop())
+ schedule_timeout(period);
+ set_task_state(current, TASK_RUNNING);
+ } while (!kthread_should_stop());
+
+ if (host->caps & MMC_CAP_SDIO_IRQ)
+ host->ops->enable_sdio_irq(host, 0);
+
+ pr_debug("%s: IRQ thread exiting with code %d\n",
+ mmc_hostname(host), ret);
+
+ return ret;
+}
+
+static int sdio_card_irq_get(struct mmc_card *card)
+{
+ struct mmc_host *host = card->host;
+
+ WARN_ON(!host->claimed);
+
+ if (!host->sdio_irqs++) {
+ atomic_set(&host->sdio_irq_thread_abort, 0);
+ host->sdio_irq_thread =
+ kthread_run(sdio_irq_thread, host, "ksdiorqd");
+ if (IS_ERR(host->sdio_irq_thread)) {
+ int err = PTR_ERR(host->sdio_irq_thread);
+ host->sdio_irqs--;
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int sdio_card_irq_put(struct mmc_card *card)
+{
+ struct mmc_host *host = card->host;
+
+ WARN_ON(!host->claimed);
+ BUG_ON(host->sdio_irqs < 1);
+
+ if (!--host->sdio_irqs) {
+ atomic_set(&host->sdio_irq_thread_abort, 1);
+ kthread_stop(host->sdio_irq_thread);
+ }
+
+ return 0;
+}
+
+/**
+ * sdio_claim_irq - claim the IRQ for a SDIO function
+ * @func: SDIO function
+ * @handler: IRQ handler callback
+ *
+ * Claim and activate the IRQ for the given SDIO function. The provided
+ * handler will be called when that IRQ is asserted. The host is always
+ * claimed already when the handler is called so the handler must not
+ * call sdio_claim_host() nor sdio_release_host().
+ */
+int sdio_claim_irq(struct sdio_func *func, sdio_irq_handler_t *handler)
+{
+ int ret;
+ unsigned char reg;
+
+ BUG_ON(!func);
+ BUG_ON(!func->card);
+
+ pr_debug("SDIO: Enabling IRQ for %s...\n", sdio_func_id(func));
+
+ if (func->irq_handler) {
+ pr_debug("SDIO: IRQ for %s already in use.\n", sdio_func_id(func));
+ return -EBUSY;
+ }
+
+ ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
+ if (ret)
+ return ret;
+
+ reg |= 1 << func->num;
+
+ reg |= 1; /* Master interrupt enable */
+
+ ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL);
+ if (ret)
+ return ret;
+
+ func->irq_handler = handler;
+ ret = sdio_card_irq_get(func->card);
+ if (ret)
+ func->irq_handler = NULL;
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sdio_claim_irq);
+
+/**
+ * sdio_release_irq - release the IRQ for a SDIO function
+ * @func: SDIO function
+ *
+ * Disable and release the IRQ for the given SDIO function.
+ */
+int sdio_release_irq(struct sdio_func *func)
+{
+ int ret;
+ unsigned char reg;
+
+ BUG_ON(!func);
+ BUG_ON(!func->card);
+
+ pr_debug("SDIO: Disabling IRQ for %s...\n", sdio_func_id(func));
+
+ if (func->irq_handler) {
+ func->irq_handler = NULL;
+ sdio_card_irq_put(func->card);
+ }
+
+ ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, &reg);
+ if (ret)
+ return ret;
+
+ reg &= ~(1 << func->num);
+
+ /* Disable master interrupt with the last function interrupt */
+ if (!(reg & 0xFE))
+ reg = 0;
+
+ ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(sdio_release_irq);
+
--- /dev/null
+++ b/drivers/mmc/core/sdio_ops.c
@@ -0,0 +1,175 @@
+/*
+ * linux/drivers/mmc/sdio_ops.c
+ *
+ * Copyright 2006-2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#include <linux/scatterlist.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/mmc.h>
+#include <linux/mmc/sdio.h>
+
+#include "core.h"
+
+int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
+{
+ struct mmc_command cmd;
+ int i, err = 0;
+
+ BUG_ON(!host);
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = SD_IO_SEND_OP_COND;
+ cmd.arg = ocr;
+ cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
+
+ for (i = 100; i; i--) {
+ err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
+ if (err)
+ break;
+
+ /* if we're just probing, do a single pass */
+ if (ocr == 0)
+ break;
+
+ /* otherwise wait until reset completes */
+ if (mmc_host_is_spi(host)) {
+ /*
+ * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
+ * an initialized card under SPI, but some cards
+ * (Marvell's) only behave when looking at this
+ * one.
+ */
+ if (cmd.resp[1] & MMC_CARD_BUSY)
+ break;
+ } else {
+ if (cmd.resp[0] & MMC_CARD_BUSY)
+ break;
+ }
+
+ err = -ETIMEDOUT;
+
+ mmc_delay(10);
+ }
+
+ if (rocr)
+ *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
+
+ return err;
+}
+
+int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
+ unsigned addr, u8 in, u8* out)
+{
+ struct mmc_command cmd;
+ int err;
+
+ BUG_ON(!card);
+ BUG_ON(fn > 7);
+
+ memset(&cmd, 0, sizeof(struct mmc_command));
+
+ cmd.opcode = SD_IO_RW_DIRECT;
+ cmd.arg = write ? 0x80000000 : 0x00000000;
+ cmd.arg |= fn << 28;
+ cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
+ cmd.arg |= addr << 9;
+ cmd.arg |= in;
+ cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
+
+ err = mmc_wait_for_cmd(card->host, &cmd, 0);
+ if (err)
+ return err;
+
+ if (mmc_host_is_spi(card->host)) {
+ /* host driver already reported errors */
+ } else {
+ if (cmd.resp[0] & R5_ERROR)
+ return -EIO;
+ if (cmd.resp[0] & R5_FUNCTION_NUMBER)
+ return -EINVAL;
+ if (cmd.resp[0] & R5_OUT_OF_RANGE)
+ return -ERANGE;
+ }
+
+ if (out) {
+ if (mmc_host_is_spi(card->host))
+ *out = (cmd.resp[0] >> 8) & 0xFF;
+ else
+ *out = cmd.resp[0] & 0xFF;
+ }
+
+ return 0;
+}
+
+int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
+ unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
+{
+ struct mmc_request mrq;
+ struct mmc_command cmd;
+ struct mmc_data data;
+ struct scatterlist sg;
+
+ BUG_ON(!card);
+ BUG_ON(fn > 7);
+ BUG_ON(blocks == 1 && blksz > 512);
+ WARN_ON(blocks == 0);
+ WARN_ON(blksz == 0);
+
+ memset(&mrq, 0, sizeof(struct mmc_request));
+ memset(&cmd, 0, sizeof(struct mmc_command));
+ memset(&data, 0, sizeof(struct mmc_data));
+
+ mrq.cmd = &cmd;
+ mrq.data = &data;
+
+ cmd.opcode = SD_IO_RW_EXTENDED;
+ cmd.arg = write ? 0x80000000 : 0x00000000;
+ cmd.arg |= fn << 28;
+ cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
+ cmd.arg |= addr << 9;
+ if (blocks == 1 && blksz <= 512)
+ cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */
+ else
+ cmd.arg |= 0x08000000 | blocks; /* block mode */
+ cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
+
+ data.blksz = blksz;
+ data.blocks = blocks;
+ data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
+ data.sg = &sg;
+ data.sg_len = 1;
+
+ sg_init_one(&sg, buf, blksz * blocks);
+
+ mmc_set_data_timeout(&data, card);
+
+ mmc_wait_for_req(card->host, &mrq);
+
+ if (cmd.error)
+ return cmd.error;
+ if (data.error)
+ return data.error;
+
+ if (mmc_host_is_spi(card->host)) {
+ /* host driver already reported errors */
+ } else {
+ if (cmd.resp[0] & R5_ERROR)
+ return -EIO;
+ if (cmd.resp[0] & R5_FUNCTION_NUMBER)
+ return -EINVAL;
+ if (cmd.resp[0] & R5_OUT_OF_RANGE)
+ return -ERANGE;
+ }
+
+ return 0;
+}
+
--- /dev/null
+++ b/drivers/mmc/core/sdio_ops.h
@@ -0,0 +1,22 @@
+/*
+ * linux/drivers/mmc/sdio_ops.c
+ *
+ * Copyright 2006-2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#ifndef _MMC_SDIO_OPS_H
+#define _MMC_SDIO_OPS_H
+
+int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr);
+int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
+ unsigned addr, u8 in, u8* out);
+int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
+ unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz);
+
+#endif
+
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -55,7 +55,28 @@ struct sd_switch_caps {
unsigned int hs_max_dtr;
};
+struct sdio_cccr {
+ unsigned int sdio_vsn;
+ unsigned int sd_vsn;
+ unsigned int multi_block:1,
+ low_speed:1,
+ wide_bus:1,
+ high_power:1,
+ high_speed:1;
+};
+
+struct sdio_cis {
+ unsigned short vendor;
+ unsigned short device;
+ unsigned short blksize;
+ unsigned int max_dtr;
+};
+
struct mmc_host;
+struct sdio_func;
+struct sdio_func_tuple;
+
+#define SDIO_MAX_FUNCS 7
/*
* MMC device
@@ -67,11 +88,13 @@ struct mmc_card {
unsigned int type; /* card type */
#define MMC_TYPE_MMC 0 /* MMC card */
#define MMC_TYPE_SD 1 /* SD card */
+#define MMC_TYPE_SDIO 2 /* SDIO card */
unsigned int state; /* (our) card state */
#define MMC_STATE_PRESENT (1<<0) /* present in sysfs */
#define MMC_STATE_READONLY (1<<1) /* card is read-only */
#define MMC_STATE_HIGHSPEED (1<<2) /* card is in high speed mode */
#define MMC_STATE_BLOCKADDR (1<<3) /* card uses block-addressing */
+
u32 raw_cid[4]; /* raw card CID */
u32 raw_csd[4]; /* raw card CSD */
u32 raw_scr[2]; /* raw card SCR */
@@ -80,10 +103,19 @@ struct mmc_card {
struct mmc_ext_csd ext_csd; /* mmc v4 extended card specific */
struct sd_scr scr; /* extra SD information */
struct sd_switch_caps sw_caps; /* switch (CMD6) caps */
+
+ unsigned int sdio_funcs; /* number of SDIO functions */
+ struct sdio_cccr cccr; /* common card info */
+ struct sdio_cis cis; /* common tuple info */
+ struct sdio_func *sdio_func[SDIO_MAX_FUNCS]; /* SDIO functions (devices) */
+ unsigned num_info; /* number of info strings */
+ const char **info; /* info strings */
+ struct sdio_func_tuple *tuples; /* unknown common tuples */
};
#define mmc_card_mmc(c) ((c)->type == MMC_TYPE_MMC)
#define mmc_card_sd(c) ((c)->type == MMC_TYPE_SD)
+#define mmc_card_sdio(c) ((c)->type == MMC_TYPE_SDIO)
#define mmc_card_present(c) ((c)->state & MMC_STATE_PRESENT)
#define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY)
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -25,14 +25,20 @@ struct mmc_command {
#define MMC_RSP_CRC (1 << 2) /* expect valid crc */
#define MMC_RSP_BUSY (1 << 3) /* card may send busy */
#define MMC_RSP_OPCODE (1 << 4) /* response contains opcode */
-#define MMC_CMD_MASK (3 << 5) /* command type */
+
+#define MMC_CMD_MASK (3 << 5) /* non-SPI command type */
#define MMC_CMD_AC (0 << 5)
#define MMC_CMD_ADTC (1 << 5)
#define MMC_CMD_BC (2 << 5)
#define MMC_CMD_BCR (3 << 5)
+#define MMC_RSP_SPI_S1 (1 << 7) /* one status byte */
+#define MMC_RSP_SPI_S2 (1 << 8) /* second byte */
+#define MMC_RSP_SPI_B4 (1 << 9) /* four data bytes */
+#define MMC_RSP_SPI_BUSY (1 << 10) /* card may send busy */
+
/*
- * These are the response types, and correspond to valid bit
+ * These are the native response types, and correspond to valid bit
* patterns of the above flags. One additional valid pattern
* is all zeros, which means we don't expect a response.
*/
@@ -41,12 +47,30 @@ struct mmc_command {
#define MMC_RSP_R1B (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
#define MMC_RSP_R2 (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
#define MMC_RSP_R3 (MMC_RSP_PRESENT)
+#define MMC_RSP_R4 (MMC_RSP_PRESENT)
+#define MMC_RSP_R5 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
#define MMC_RSP_R6 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
#define MMC_RSP_R7 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
#define mmc_resp_type(cmd) ((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
/*
+ * These are the SPI response types for MMC, SD, and SDIO cards.
+ * Commands return R1, with maybe more info. Zero is an error type;
+ * callers must always provide the appropriate MMC_RSP_SPI_Rx flags.
+ */
+#define MMC_RSP_SPI_R1 (MMC_RSP_SPI_S1)
+#define MMC_RSP_SPI_R1B (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY)
+#define MMC_RSP_SPI_R2 (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
+#define MMC_RSP_SPI_R3 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
+#define MMC_RSP_SPI_R4 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
+#define MMC_RSP_SPI_R5 (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
+#define MMC_RSP_SPI_R7 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
+
+#define mmc_spi_resp_type(cmd) ((cmd)->flags & \
+ (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY|MMC_RSP_SPI_S2|MMC_RSP_SPI_B4))
+
+/*
* These are the command types.
*/
#define mmc_cmd_type(cmd) ((cmd)->flags & MMC_CMD_MASK)
@@ -54,12 +78,19 @@ struct mmc_command {
unsigned int retries; /* max number of retries */
unsigned int error; /* command error */
-#define MMC_ERR_NONE 0
-#define MMC_ERR_TIMEOUT 1
-#define MMC_ERR_BADCRC 2
-#define MMC_ERR_FIFO 3
-#define MMC_ERR_FAILED 4
-#define MMC_ERR_INVALID 5
+/*
+ * Standard errno values are used for errors, but some have specific
+ * meaning in the MMC layer:
+ *
+ * ETIMEDOUT Card took too long to respond
+ * EILSEQ Basic format problem with the received or sent data
+ * (e.g. CRC check failed, incorrect opcode in response
+ * or bad end bit)
+ * EINVAL Request cannot be performed because of restrictions
+ * in hardware and/or the driver
+ * ENOMEDIUM Host can determine that the slot is empty and is
+ * actively failing requests
+ */
struct mmc_data *data; /* data segment associated with cmd */
struct mmc_request *mrq; /* associated request */
@@ -76,7 +107,6 @@ struct mmc_data {
#define MMC_DATA_WRITE (1 << 8)
#define MMC_DATA_READ (1 << 9)
#define MMC_DATA_STREAM (1 << 10)
-#define MMC_DATA_MULTI (1 << 11)
unsigned int bytes_xfered;
@@ -104,9 +134,20 @@ extern int mmc_wait_for_cmd(struct mmc_h
extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
struct mmc_command *, int);
-extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *, int);
+extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *);
-extern void mmc_claim_host(struct mmc_host *host);
+extern int __mmc_claim_host(struct mmc_host *host, atomic_t *abort);
extern void mmc_release_host(struct mmc_host *host);
+/**
+ * mmc_claim_host - exclusively claim a host
+ * @host: mmc host to claim
+ *
+ * Claim a host for a set of operations.
+ */
+static inline void mmc_claim_host(struct mmc_host *host)
+{
+ __mmc_claim_host(host, NULL);
+}
+
#endif
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -10,6 +10,8 @@
#ifndef LINUX_MMC_HOST_H
#define LINUX_MMC_HOST_H
+#include <linux/leds.h>
+
#include <linux/mmc/core.h>
struct mmc_ios {
@@ -51,6 +53,7 @@ struct mmc_host_ops {
void (*request)(struct mmc_host *host, struct mmc_request *req);
void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
int (*get_ro)(struct mmc_host *host);
+ void (*enable_sdio_irq)(struct mmc_host *host, int enable);
};
struct mmc_card;
@@ -87,9 +90,10 @@ struct mmc_host {
#define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */
#define MMC_CAP_MULTIWRITE (1 << 1) /* Can accurately report bytes sent to card on error */
-#define MMC_CAP_BYTEBLOCK (1 << 2) /* Can do non-log2 block sizes */
-#define MMC_CAP_MMC_HIGHSPEED (1 << 3) /* Can do MMC high-speed timing */
-#define MMC_CAP_SD_HIGHSPEED (1 << 4) /* Can do SD high-speed timing */
+#define MMC_CAP_MMC_HIGHSPEED (1 << 2) /* Can do MMC high-speed timing */
+#define MMC_CAP_SD_HIGHSPEED (1 << 3) /* Can do SD high-speed timing */
+#define MMC_CAP_SDIO_IRQ (1 << 4) /* Can signal pending SDIO IRQs */
+#define MMC_CAP_SPI (1 << 5) /* Talks only SPI protocols */
/* host specific block data */
unsigned int max_seg_size; /* see blk_queue_max_segment_size */
@@ -106,23 +110,30 @@ struct mmc_host {
struct mmc_ios ios; /* current io bus settings */
u32 ocr; /* the current OCR setting */
- unsigned int mode; /* current card mode of host */
-#define MMC_MODE_MMC 0
-#define MMC_MODE_SD 1
+ /* group bitfields together to minimize padding */
+ unsigned int use_spi_crc:1;
+ unsigned int claimed:1; /* host exclusively claimed */
+ unsigned int bus_dead:1; /* bus has been released */
+#ifdef CONFIG_MMC_DEBUG
+ unsigned int removed:1; /* host is being removed */
+#endif
struct mmc_card *card; /* device attached to this host */
wait_queue_head_t wq;
- unsigned int claimed:1; /* host exclusively claimed */
struct delayed_work detect;
-#ifdef CONFIG_MMC_DEBUG
- unsigned int removed:1; /* host is being removed */
-#endif
const struct mmc_bus_ops *bus_ops; /* current bus driver */
unsigned int bus_refs; /* reference counter */
- unsigned int bus_dead:1; /* bus has been released */
+
+ unsigned int sdio_irqs;
+ struct task_struct *sdio_irq_thread;
+ atomic_t sdio_irq_thread_abort;
+
+#ifdef CONFIG_LEDS_TRIGGERS
+ struct led_trigger *led; /* activity led */
+#endif
unsigned long private[0] ____cacheline_aligned;
};
@@ -137,6 +148,8 @@ static inline void *mmc_priv(struct mmc_
return (void *)host->private;
}
+#define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI)
+
#define mmc_dev(x) ((x)->parent)
#define mmc_classdev(x) (&(x)->class_dev)
#define mmc_hostname(x) ((x)->class_dev.bus_id)
@@ -147,5 +160,11 @@ extern int mmc_resume_host(struct mmc_ho
extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
+static inline void mmc_signal_sdio_irq(struct mmc_host *host)
+{
+ host->ops->enable_sdio_irq(host, 0);
+ wake_up_process(host->sdio_irq_thread);
+}
+
#endif
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -27,7 +27,7 @@
/* Standard MMC commands (4.1) type argument response */
/* class 1 */
-#define MMC_GO_IDLE_STATE 0 /* bc */
+#define MMC_GO_IDLE_STATE 0 /* bc */
#define MMC_SEND_OP_COND 1 /* bcr [31:0] OCR R3 */
#define MMC_ALL_SEND_CID 2 /* bcr R2 */
#define MMC_SET_RELATIVE_ADDR 3 /* ac [31:16] RCA R1 */
@@ -39,8 +39,10 @@
#define MMC_SEND_CID 10 /* ac [31:16] RCA R2 */
#define MMC_READ_DAT_UNTIL_STOP 11 /* adtc [31:0] dadr R1 */
#define MMC_STOP_TRANSMISSION 12 /* ac R1b */
-#define MMC_SEND_STATUS 13 /* ac [31:16] RCA R1 */
+#define MMC_SEND_STATUS 13 /* ac [31:16] RCA R1 */
#define MMC_GO_INACTIVE_STATE 15 /* ac [31:16] RCA */
+#define MMC_SPI_READ_OCR 58 /* spi spi_R3 */
+#define MMC_SPI_CRC_ON_OFF 59 /* spi [0:0] flag spi_R1 */
/* class 2 */
#define MMC_SET_BLOCKLEN 16 /* ac [31:0] block len R1 */
@@ -90,15 +92,15 @@
*/
/*
- MMC status in R1
+ MMC status in R1, for native mode (SPI bits are different)
Type
- e : error bit
+ e : error bit
s : status bit
r : detected and set for the actual command response
x : detected and set during command execution. the host must poll
the card by sending status command in order to read these bits.
Clear condition
- a : according to the card state
+ a : according to the card state
b : always related to the previous command. Reception of
a valid command will clear it (with a delay of one command)
c : clear by read
@@ -124,10 +126,33 @@
#define R1_CARD_ECC_DISABLED (1 << 14) /* sx, a */
#define R1_ERASE_RESET (1 << 13) /* sr, c */
#define R1_STATUS(x) (x & 0xFFFFE000)
-#define R1_CURRENT_STATE(x) ((x & 0x00001E00) >> 9) /* sx, b (4 bits) */
+#define R1_CURRENT_STATE(x) ((x & 0x00001E00) >> 9) /* sx, b (4 bits) */
#define R1_READY_FOR_DATA (1 << 8) /* sx, a */
#define R1_APP_CMD (1 << 5) /* sr, c */
+/*
+ * MMC/SD in SPI mode reports R1 status always, and R2 for SEND_STATUS
+ * R1 is the low order byte; R2 is the next highest byte, when present.
+ */
+#define R1_SPI_IDLE (1 << 0)
+#define R1_SPI_ERASE_RESET (1 << 1)
+#define R1_SPI_ILLEGAL_COMMAND (1 << 2)
+#define R1_SPI_COM_CRC (1 << 3)
+#define R1_SPI_ERASE_SEQ (1 << 4)
+#define R1_SPI_ADDRESS (1 << 5)
+#define R1_SPI_PARAMETER (1 << 6)
+/* R1 bit 7 is always zero */
+#define R2_SPI_CARD_LOCKED (1 << 8)
+#define R2_SPI_WP_ERASE_SKIP (1 << 9) /* or lock/unlock fail */
+#define R2_SPI_LOCK_UNLOCK_FAIL R2_SPI_WP_ERASE_SKIP
+#define R2_SPI_ERROR (1 << 10)
+#define R2_SPI_CC_ERROR (1 << 11)
+#define R2_SPI_CARD_ECC_ERROR (1 << 12)
+#define R2_SPI_WP_VIOLATION (1 << 13)
+#define R2_SPI_ERASE_PARAM (1 << 14)
+#define R2_SPI_OUT_OF_RANGE (1 << 15) /* or CSD overwrite */
+#define R2_SPI_CSD_OVERWRITE R2_SPI_OUT_OF_RANGE
+
/* These are unpacked versions of the actual responses */
struct _mmc_csd {
@@ -182,6 +207,7 @@ struct _mmc_csd {
*/
#define CCC_BASIC (1<<0) /* (0) Basic protocol functions */
/* (CMD0,1,2,3,4,7,9,10,12,13,15) */
+ /* (and for SPI, CMD58,59) */
#define CCC_STREAM_READ (1<<1) /* (1) Stream read commands */
/* (CMD11) */
#define CCC_BLOCK_READ (1<<2) /* (2) Block read commands */
@@ -227,6 +253,7 @@ struct _mmc_csd {
#define EXT_CSD_BUS_WIDTH 183 /* R/W */
#define EXT_CSD_HS_TIMING 185 /* R/W */
#define EXT_CSD_CARD_TYPE 196 /* RO */
+#define EXT_CSD_REV 192 /* RO */
#define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */
/*
--- /dev/null
+++ b/include/linux/mmc/sdio.h
@@ -0,0 +1,159 @@
+/*
+ * include/linux/mmc/sdio.h
+ *
+ * Copyright 2006-2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#ifndef MMC_SDIO_H
+#define MMC_SDIO_H
+
+/* SDIO commands type argument response */
+#define SD_IO_SEND_OP_COND 5 /* bcr [23:0] OCR R4 */
+#define SD_IO_RW_DIRECT 52 /* ac [31:0] See below R5 */
+#define SD_IO_RW_EXTENDED 53 /* adtc [31:0] See below R5 */
+
+/*
+ * SD_IO_RW_DIRECT argument format:
+ *
+ * [31] R/W flag
+ * [30:28] Function number
+ * [27] RAW flag
+ * [25:9] Register address
+ * [7:0] Data
+ */
+
+/*
+ * SD_IO_RW_EXTENDED argument format:
+ *
+ * [31] R/W flag
+ * [30:28] Function number
+ * [27] Block mode
+ * [26] Increment address
+ * [25:9] Register address
+ * [8:0] Byte/block count
+ */
+
+/*
+ SDIO status in R5
+ Type
+ e : error bit
+ s : status bit
+ r : detected and set for the actual command response
+ x : detected and set during command execution. the host must poll
+ the card by sending status command in order to read these bits.
+ Clear condition
+ a : according to the card state
+ b : always related to the previous command. Reception of
+ a valid command will clear it (with a delay of one command)
+ c : clear by read
+ */
+
+#define R5_COM_CRC_ERROR (1 << 15) /* er, b */
+#define R5_ILLEGAL_COMMAND (1 << 14) /* er, b */
+#define R5_ERROR (1 << 11) /* erx, c */
+#define R5_FUNCTION_NUMBER (1 << 9) /* er, c */
+#define R5_OUT_OF_RANGE (1 << 8) /* er, c */
+#define R5_STATUS(x) (x & 0xCB00)
+#define R5_IO_CURRENT_STATE(x) ((x & 0x3000) >> 12) /* s, b */
+
+/*
+ * Card Common Control Registers (CCCR)
+ */
+
+#define SDIO_CCCR_CCCR 0x00
+
+#define SDIO_CCCR_REV_1_00 0 /* CCCR/FBR Version 1.00 */
+#define SDIO_CCCR_REV_1_10 1 /* CCCR/FBR Version 1.10 */
+#define SDIO_CCCR_REV_1_20 2 /* CCCR/FBR Version 1.20 */
+
+#define SDIO_SDIO_REV_1_00 0 /* SDIO Spec Version 1.00 */
+#define SDIO_SDIO_REV_1_10 1 /* SDIO Spec Version 1.10 */
+#define SDIO_SDIO_REV_1_20 2 /* SDIO Spec Version 1.20 */
+#define SDIO_SDIO_REV_2_00 3 /* SDIO Spec Version 2.00 */
+
+#define SDIO_CCCR_SD 0x01
+
+#define SDIO_SD_REV_1_01 0 /* SD Physical Spec Version 1.01 */
+#define SDIO_SD_REV_1_10 1 /* SD Physical Spec Version 1.10 */
+#define SDIO_SD_REV_2_00 2 /* SD Physical Spec Version 2.00 */
+
+#define SDIO_CCCR_IOEx 0x02
+#define SDIO_CCCR_IORx 0x03
+
+#define SDIO_CCCR_IENx 0x04 /* Function/Master Interrupt Enable */
+#define SDIO_CCCR_INTx 0x05 /* Function Interrupt Pending */
+
+#define SDIO_CCCR_ABORT 0x06 /* function abort/card reset */
+
+#define SDIO_CCCR_IF 0x07 /* bus interface controls */
+
+#define SDIO_BUS_WIDTH_1BIT 0x00
+#define SDIO_BUS_WIDTH_4BIT 0x02
+
+#define SDIO_BUS_CD_DISABLE 0x80 /* disable pull-up on DAT3 (pin 1) */
+
+#define SDIO_CCCR_CAPS 0x08
+
+#define SDIO_CCCR_CAP_SDC 0x01 /* can do CMD52 while data transfer */
+#define SDIO_CCCR_CAP_SMB 0x02 /* can do multi-block xfers (CMD53) */
+#define SDIO_CCCR_CAP_SRW 0x04 /* supports read-wait protocol */
+#define SDIO_CCCR_CAP_SBS 0x08 /* supports suspend/resume */
+#define SDIO_CCCR_CAP_S4MI 0x10 /* interrupt during 4-bit CMD53 */
+#define SDIO_CCCR_CAP_E4MI 0x20 /* enable ints during 4-bit CMD53 */
+#define SDIO_CCCR_CAP_LSC 0x40 /* low speed card */
+#define SDIO_CCCR_CAP_4BLS 0x80 /* 4 bit low speed card */
+
+#define SDIO_CCCR_CIS 0x09 /* common CIS pointer (3 bytes) */
+
+/* Following 4 regs are valid only if SBS is set */
+#define SDIO_CCCR_SUSPEND 0x0c
+#define SDIO_CCCR_SELx 0x0d
+#define SDIO_CCCR_EXECx 0x0e
+#define SDIO_CCCR_READYx 0x0f
+
+#define SDIO_CCCR_BLKSIZE 0x10
+
+#define SDIO_CCCR_POWER 0x12
+
+#define SDIO_POWER_SMPC 0x01 /* Supports Master Power Control */
+#define SDIO_POWER_EMPC 0x02 /* Enable Master Power Control */
+
+#define SDIO_CCCR_SPEED 0x13
+
+#define SDIO_SPEED_SHS 0x01 /* Supports High-Speed mode */
+#define SDIO_SPEED_EHS 0x02 /* Enable High-Speed mode */
+
+/*
+ * Function Basic Registers (FBR)
+ */
+
+#define SDIO_FBR_BASE(f) ((f) * 0x100) /* base of function f's FBRs */
+
+#define SDIO_FBR_STD_IF 0x00
+
+#define SDIO_FBR_SUPPORTS_CSA 0x40 /* supports Code Storage Area */
+#define SDIO_FBR_ENABLE_CSA 0x80 /* enable Code Storage Area */
+
+#define SDIO_FBR_STD_IF_EXT 0x01
+
+#define SDIO_FBR_POWER 0x02
+
+#define SDIO_FBR_POWER_SPS 0x01 /* Supports Power Selection */
+#define SDIO_FBR_POWER_EPS 0x02 /* Enable (low) Power Selection */
+
+#define SDIO_FBR_CIS 0x09 /* CIS pointer (3 bytes) */
+
+
+#define SDIO_FBR_CSA 0x0C /* CSA pointer (3 bytes) */
+
+#define SDIO_FBR_CSA_DATA 0x0F
+
+#define SDIO_FBR_BLKSIZE 0x10 /* block size (2 bytes) */
+
+#endif
+
--- /dev/null
+++ b/include/linux/mmc/sdio_func.h
@@ -0,0 +1,153 @@
+/*
+ * include/linux/mmc/sdio_func.h
+ *
+ * Copyright 2007 Pierre Ossman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+#ifndef MMC_SDIO_FUNC_H
+#define MMC_SDIO_FUNC_H
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+
+struct mmc_card;
+struct sdio_func;
+
+typedef void (sdio_irq_handler_t)(struct sdio_func *);
+
+/*
+ * SDIO function CIS tuple (unknown to the core)
+ */
+struct sdio_func_tuple {
+ struct sdio_func_tuple *next;
+ unsigned char code;
+ unsigned char size;
+ unsigned char data[0];
+};
+
+/*
+ * SDIO function devices
+ */
+struct sdio_func {
+ struct mmc_card *card; /* the card this device belongs to */
+ struct device dev; /* the device */
+ sdio_irq_handler_t *irq_handler; /* IRQ callback */
+ unsigned int num; /* function number */
+
+ unsigned char class; /* standard interface class */
+ unsigned short vendor; /* vendor id */
+ unsigned short device; /* device id */
+
+ unsigned max_blksize; /* maximum block size */
+ unsigned cur_blksize; /* current block size */
+
+ unsigned int state; /* function state */
+#define SDIO_STATE_PRESENT (1<<0) /* present in sysfs */
+
+ u8 tmpbuf[4]; /* DMA:able scratch buffer */
+
+ unsigned num_info; /* number of info strings */
+ const char **info; /* info strings */
+
+ struct sdio_func_tuple *tuples;
+};
+
+#define sdio_func_present(f) ((f)->state & SDIO_STATE_PRESENT)
+
+#define sdio_func_set_present(f) ((f)->state |= SDIO_STATE_PRESENT)
+
+#define sdio_func_id(f) ((f)->dev.bus_id)
+
+#define sdio_get_drvdata(f) dev_get_drvdata(&(f)->dev)
+#define sdio_set_drvdata(f,d) dev_set_drvdata(&(f)->dev, d)
+
+/*
+ * SDIO function device driver
+ */
+struct sdio_driver {
+ char *name;
+ const struct sdio_device_id *id_table;
+
+ int (*probe)(struct sdio_func *, const struct sdio_device_id *);
+ void (*remove)(struct sdio_func *);
+
+ struct device_driver drv;
+};
+
+/**
+ * SDIO_DEVICE - macro used to describe a specific SDIO device
+ * @vend: the 16 bit manufacturer code
+ * @dev: the 16 bit function id
+ *
+ * This macro is used to create a struct sdio_device_id that matches a
+ * specific device. The class field will be set to SDIO_ANY_ID.
+ */
+#define SDIO_DEVICE(vend,dev) \
+ .class = SDIO_ANY_ID, \
+ .vendor = (vend), .device = (dev)
+
+/**
+ * SDIO_DEVICE_CLASS - macro used to describe a specific SDIO device class
+ * @dev_class: the 8 bit standard interface code
+ *
+ * This macro is used to create a struct sdio_device_id that matches a
+ * specific standard SDIO function type. The vendor and device fields will
+ * be set to SDIO_ANY_ID.
+ */
+#define SDIO_DEVICE_CLASS(dev_class) \
+ .class = (dev_class), \
+ .vendor = SDIO_ANY_ID, .device = SDIO_ANY_ID
+
+extern int sdio_register_driver(struct sdio_driver *);
+extern void sdio_unregister_driver(struct sdio_driver *);
+
+/*
+ * SDIO I/O operations
+ */
+extern void sdio_claim_host(struct sdio_func *func);
+extern void sdio_release_host(struct sdio_func *func);
+
+extern int sdio_enable_func(struct sdio_func *func);
+extern int sdio_disable_func(struct sdio_func *func);
+
+extern int sdio_set_block_size(struct sdio_func *func, unsigned blksz);
+
+extern int sdio_claim_irq(struct sdio_func *func, sdio_irq_handler_t *handler);
+extern int sdio_release_irq(struct sdio_func *func);
+
+extern unsigned char sdio_readb(struct sdio_func *func,
+ unsigned int addr, int *err_ret);
+extern unsigned short sdio_readw(struct sdio_func *func,
+ unsigned int addr, int *err_ret);
+extern unsigned long sdio_readl(struct sdio_func *func,
+ unsigned int addr, int *err_ret);
+
+extern int sdio_memcpy_fromio(struct sdio_func *func, void *dst,
+ unsigned int addr, int count);
+extern int sdio_readsb(struct sdio_func *func, void *dst,
+ unsigned int addr, int count);
+
+extern void sdio_writeb(struct sdio_func *func, unsigned char b,
+ unsigned int addr, int *err_ret);
+extern void sdio_writew(struct sdio_func *func, unsigned short b,
+ unsigned int addr, int *err_ret);
+extern void sdio_writel(struct sdio_func *func, unsigned long b,
+ unsigned int addr, int *err_ret);
+
+extern int sdio_memcpy_toio(struct sdio_func *func, unsigned int addr,
+ void *src, int count);
+extern int sdio_writesb(struct sdio_func *func, unsigned int addr,
+ void *src, int count);
+
+extern unsigned char sdio_f0_readb(struct sdio_func *func,
+ unsigned int addr, int *err_ret);
+extern void sdio_f0_writeb(struct sdio_func *func, unsigned char b,
+ unsigned int addr, int *err_ret);
+
+#endif
+
--- /dev/null
+++ b/include/linux/mmc/sdio_ids.h
@@ -0,0 +1,29 @@
+/*
+ * SDIO Classes, Interface Types, Manufacturer IDs, etc.
+ */
+
+#ifndef MMC_SDIO_IDS_H
+#define MMC_SDIO_IDS_H
+
+/*
+ * Standard SDIO Function Interfaces
+ */
+
+#define SDIO_CLASS_NONE 0x00 /* Not a SDIO standard interface */
+#define SDIO_CLASS_UART 0x01 /* standard UART interface */
+#define SDIO_CLASS_BT_A 0x02 /* Type-A BlueTooth std interface */
+#define SDIO_CLASS_BT_B 0x03 /* Type-B BlueTooth std interface */
+#define SDIO_CLASS_GPS 0x04 /* GPS standard interface */
+#define SDIO_CLASS_CAMERA 0x05 /* Camera standard interface */
+#define SDIO_CLASS_PHS 0x06 /* PHS standard interface */
+#define SDIO_CLASS_WLAN 0x07 /* WLAN interface */
+#define SDIO_CLASS_ATA 0x08 /* Embedded SDIO-ATA std interface */
+
+/*
+ * Vendors and devices. Sort key: vendor first, device next.
+ */
+
+#define SDIO_VENDOR_ID_MARVELL 0x02df
+#define SDIO_DEVICE_ID_MARVELL_LIBERTAS 0x9103
+
+#endif
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -22,6 +22,18 @@ struct pci_device_id {
};
+/* SDIO */
+
+#define SDIO_ANY_ID (~0)
+
+struct sdio_device_id {
+ __u8 class; /* Standard interface or SDIO_ANY_ID */
+ __u16 vendor; /* Vendor or SDIO_ANY_ID */
+ __u16 device; /* Device ID or SDIO_ANY_ID */
+ kernel_ulong_t driver_data; /* Data private to the driver */
+};
+
+
#define IEEE1394_MATCH_VENDOR_ID 0x0001
#define IEEE1394_MATCH_MODEL_ID 0x0002
#define IEEE1394_MATCH_SPECIFIER_ID 0x0004
--- a/drivers/mmc/card/Kconfig
+++ b/drivers/mmc/card/Kconfig
@@ -32,3 +32,10 @@ config MMC_BLOCK_BOUNCE
If unsure, say Y here.
+config SDIO_UART
+ tristate "SDIO UART/GPS class support"
+ depends on MMC
+ help
+ SDIO function driver for SDIO cards that implements the UART
+ class, as well as the GPS class which appears like a UART.
+
--- a/drivers/mmc/card/Makefile
+++ b/drivers/mmc/card/Makefile
@@ -9,3 +9,5 @@ endif
obj-$(CONFIG_MMC_BLOCK) += mmc_block.o
mmc_block-objs := block.o queue.o
+obj-$(CONFIG_SDIO_UART) += sdio_uart.o
+
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -44,6 +44,9 @@
* max 8 partitions per card
*/
#define MMC_SHIFT 3
+#define MMC_NUM_MINORS (256 >> MMC_SHIFT)
+
+static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];
/*
* There is one mmc_blk_data per slot.
@@ -80,6 +83,9 @@ static void mmc_blk_put(struct mmc_blk_d
mutex_lock(&open_lock);
md->usage--;
if (md->usage == 0) {
+ int devidx = md->disk->first_minor >> MMC_SHIFT;
+ __clear_bit(devidx, dev_use);
+
put_disk(md->disk);
kfree(md);
}
@@ -151,17 +157,19 @@ static u32 mmc_sd_num_wr_blocks(struct m
cmd.opcode = MMC_APP_CMD;
cmd.arg = card->rca << 16;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
err = mmc_wait_for_cmd(card->host, &cmd, 0);
- if ((err != MMC_ERR_NONE) || !(cmd.resp[0] & R1_APP_CMD))
+ if (err)
+ return (u32)-1;
+ if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
return (u32)-1;
memset(&cmd, 0, sizeof(struct mmc_command));
cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
cmd.arg = 0;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
memset(&data, 0, sizeof(struct mmc_data));
@@ -192,7 +200,7 @@ static u32 mmc_sd_num_wr_blocks(struct m
mmc_wait_for_req(card->host, &mrq);
- if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE)
+ if (cmd.error || data.error)
return (u32)-1;
blocks = ntohl(blocks);
@@ -220,17 +228,15 @@ static int mmc_blk_issue_rq(struct mmc_q
brq.cmd.arg = req->sector;
if (!mmc_card_blockaddr(card))
brq.cmd.arg <<= 9;
- brq.cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
+ brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
brq.data.blksz = 1 << md->block_bits;
brq.stop.opcode = MMC_STOP_TRANSMISSION;
brq.stop.arg = 0;
- brq.stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
+ brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
brq.data.blocks = req->nr_sectors >> (md->block_bits - 9);
if (brq.data.blocks > card->host->max_blk_count)
brq.data.blocks = card->host->max_blk_count;
- mmc_set_data_timeout(&brq.data, card, rq_data_dir(req) != READ);
-
/*
* If the host doesn't support multiple block writes, force
* block writes to single block. SD cards are excepted from
@@ -243,8 +249,12 @@ static int mmc_blk_issue_rq(struct mmc_q
brq.data.blocks = 1;
if (brq.data.blocks > 1) {
- brq.data.flags |= MMC_DATA_MULTI;
- brq.mrq.stop = &brq.stop;
+ /* SPI multiblock writes terminate using a special
+ * token, not a STOP_TRANSMISSION request.
+ */
+ if (!mmc_host_is_spi(card->host)
+ || rq_data_dir(req) == READ)
+ brq.mrq.stop = &brq.stop;
readcmd = MMC_READ_MULTIPLE_BLOCK;
writecmd = MMC_WRITE_MULTIPLE_BLOCK;
} else {
@@ -261,6 +271,8 @@ static int mmc_blk_issue_rq(struct mmc_q
brq.data.flags |= MMC_DATA_WRITE;
}
+ mmc_set_data_timeout(&brq.data, card);
+
brq.data.sg = mq->sg;
brq.data.sg_len = mmc_queue_map_sg(mq);
@@ -302,7 +314,7 @@ static int mmc_blk_issue_rq(struct mmc_q
goto cmd_err;
}
- if (rq_data_dir(req) != READ) {
+ if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
do {
int err;
@@ -315,7 +327,13 @@ static int mmc_blk_issue_rq(struct mmc_q
req->rq_disk->disk_name, err);
goto cmd_err;
}
- } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
+ /*
+ * Some cards mishandle the status bits,
+ * so make sure to check both the busy
+ * indication and the card state.
+ */
+ } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
+ (R1_CURRENT_STATE(cmd.resp[0]) == 7));
#if 0
if (cmd.resp[0] & ~0x00000900)
@@ -394,9 +412,6 @@ static int mmc_blk_issue_rq(struct mmc_q
return 0;
}
-#define MMC_NUM_MINORS (256 >> MMC_SHIFT)
-
-static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];
static inline int mmc_blk_readonly(struct mmc_card *card)
{
@@ -510,7 +525,7 @@ mmc_blk_set_blksize(struct mmc_blk_data
mmc_claim_host(card->host);
cmd.opcode = MMC_SET_BLOCKLEN;
cmd.arg = 1 << md->block_bits;
- cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+ cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
err = mmc_wait_for_cmd(card->host, &cmd, 5);
mmc_release_host(card->host);
@@ -562,17 +577,12 @@ static void mmc_blk_remove(struct mmc_ca
struct mmc_blk_data *md = mmc_get_drvdata(card);
if (md) {
- int devidx;
-
/* Stop new requests from getting into the queue */
del_gendisk(md->disk);
/* Then flush out any already in there */
mmc_cleanup_queue(&md->queue);
- devidx = md->disk->first_minor >> MMC_SHIFT;
- __clear_bit(devidx, dev_use);
-
mmc_blk_put(md);
}
mmc_set_drvdata(card, NULL);
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -13,6 +13,7 @@
#include <linux/blkdev.h>
#include <linux/freezer.h>
#include <linux/kthread.h>
+#include <linux/scatterlist.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
@@ -22,6 +23,12 @@
#define MMC_QUEUE_SUSPENDED (1 << 0)
+#define sg_init_table(sg, n) do { \
+ memset(sg, 0, sizeof(*(sg)) * (n)); \
+} while (0)
+
+#define sg_virt(sg) (page_address((sg)->page) + (sg)->offset)
+
/*
* Prepare a MMC request. This just filters out odd stuff.
*/
@@ -159,6 +166,7 @@ int mmc_init_queue(struct mmc_queue *mq,
ret = -ENOMEM;
goto cleanup_queue;
}
+ sg_init_table(mq->sg, 1);
mq->bounce_sg = kmalloc(sizeof(struct scatterlist) *
bouncesz / 512, GFP_KERNEL);
@@ -166,6 +174,7 @@ int mmc_init_queue(struct mmc_queue *mq,
ret = -ENOMEM;
goto cleanup_queue;
}
+ sg_init_table(mq->bounce_sg, bouncesz / 512);
}
}
#endif
@@ -183,6 +192,7 @@ int mmc_init_queue(struct mmc_queue *mq,
ret = -ENOMEM;
goto cleanup_queue;
}
+ sg_init_table(mq->sg, host->max_phys_segs);
}
init_MUTEX(&mq->thread_sem);
@@ -302,12 +312,12 @@ static void copy_sg(struct scatterlist *
BUG_ON(dst_len == 0);
if (dst_size == 0) {
- dst_buf = page_address(dst->page) + dst->offset;
+ dst_buf = sg_virt(dst);
dst_size = dst->length;
}
if (src_size == 0) {
- src_buf = page_address(src->page) + src->offset;
+ src_buf = sg_virt(src);
src_size = src->length;
}
@@ -353,9 +363,7 @@ unsigned int mmc_queue_map_sg(struct mmc
return 1;
}
- mq->sg[0].page = virt_to_page(mq->bounce_buf);
- mq->sg[0].offset = offset_in_page(mq->bounce_buf);
- mq->sg[0].length = 0;
+ sg_init_one(mq->sg, mq->bounce_buf, 0);
while (sg_len) {
mq->sg[0].length += mq->bounce_sg[sg_len - 1].length;
--- /dev/null
+++ b/drivers/mmc/card/sdio_uart.c
@@ -0,0 +1,1158 @@
+/*
+ * linux/drivers/mmc/card/sdio_uart.c - SDIO UART/GPS driver
+ *
+ * Based on drivers/serial/8250.c and drivers/serial/serial_core.c
+ * by Russell King.
+ *
+ * Author: Nicolas Pitre
+ * Created: June 15, 2007
+ * Copyright: MontaVista Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ */
+
+/*
+ * Note: Although this driver assumes a 16550A-like UART implementation,
+ * it is not possible to leverage the common 8250/16550 driver, nor the
+ * core UART infrastructure, as they assumes direct access to the hardware
+ * registers, often under a spinlock. This is not possible in the SDIO
+ * context as SDIO access functions must be able to sleep.
+ *
+ * Because we need to lock the SDIO host to ensure an exclusive access to
+ * the card, we simply rely on that lock to also prevent and serialize
+ * concurrent access to the same port.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mutex.h>
+#include <linux/serial_reg.h>
+#include <linux/circ_buf.h>
+#include <linux/gfp.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+
+#include <linux/mmc/core.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/sdio_func.h>
+#include <linux/mmc/sdio_ids.h>
+
+
+#define UART_NR 8 /* Number of UARTs this driver can handle */
+
+
+#define UART_XMIT_SIZE PAGE_SIZE
+#define WAKEUP_CHARS 256
+
+#define circ_empty(circ) ((circ)->head == (circ)->tail)
+#define circ_clear(circ) ((circ)->head = (circ)->tail = 0)
+
+#define circ_chars_pending(circ) \
+ (CIRC_CNT((circ)->head, (circ)->tail, UART_XMIT_SIZE))
+
+#define circ_chars_free(circ) \
+ (CIRC_SPACE((circ)->head, (circ)->tail, UART_XMIT_SIZE))
+
+
+struct uart_icount {
+ __u32 cts;
+ __u32 dsr;
+ __u32 rng;
+ __u32 dcd;
+ __u32 rx;
+ __u32 tx;
+ __u32 frame;
+ __u32 overrun;
+ __u32 parity;
+ __u32 brk;
+};
+
+struct sdio_uart_port {
+ struct kref kref;
+ struct tty_struct *tty;
+ unsigned int index;
+ unsigned int opened;
+ struct mutex open_lock;
+ struct sdio_func *func;
+ struct mutex func_lock;
+ struct task_struct *in_sdio_uart_irq;
+ unsigned int regs_offset;
+ struct circ_buf xmit;
+ spinlock_t write_lock;
+ struct uart_icount icount;
+ unsigned int uartclk;
+ unsigned int mctrl;
+ unsigned int read_status_mask;
+ unsigned int ignore_status_mask;
+ unsigned char x_char;
+ unsigned char ier;
+ unsigned char lcr;
+};
+
+static struct sdio_uart_port *sdio_uart_table[UART_NR];
+static DEFINE_SPINLOCK(sdio_uart_table_lock);
+
+static int sdio_uart_add_port(struct sdio_uart_port *port)
+{
+ int index, ret = -EBUSY;
+
+ kref_init(&port->kref);
+ mutex_init(&port->open_lock);
+ mutex_init(&port->func_lock);
+ spin_lock_init(&port->write_lock);
+
+ spin_lock(&sdio_uart_table_lock);
+ for (index = 0; index < UART_NR; index++) {
+ if (!sdio_uart_table[index]) {
+ port->index = index;
+ sdio_uart_table[index] = port;
+ ret = 0;
+ break;
+ }
+ }
+ spin_unlock(&sdio_uart_table_lock);
+
+ return ret;
+}
+
+static struct sdio_uart_port *sdio_uart_port_get(unsigned index)
+{
+ struct sdio_uart_port *port;
+
+ if (index >= UART_NR)
+ return NULL;
+
+ spin_lock(&sdio_uart_table_lock);
+ port = sdio_uart_table[index];
+ if (port)
+ kref_get(&port->kref);
+ spin_unlock(&sdio_uart_table_lock);
+
+ return port;
+}
+
+static void sdio_uart_port_destroy(struct kref *kref)
+{
+ struct sdio_uart_port *port =
+ container_of(kref, struct sdio_uart_port, kref);
+ kfree(port);
+}
+
+static void sdio_uart_port_put(struct sdio_uart_port *port)
+{
+ kref_put(&port->kref, sdio_uart_port_destroy);
+}
+
+static void sdio_uart_port_remove(struct sdio_uart_port *port)
+{
+ struct sdio_func *func;
+
+ BUG_ON(sdio_uart_table[port->index] != port);
+
+ spin_lock(&sdio_uart_table_lock);
+ sdio_uart_table[port->index] = NULL;
+ spin_unlock(&sdio_uart_table_lock);
+
+ /*
+ * We're killing a port that potentially still is in use by
+ * the tty layer. Be careful to prevent any further access
+ * to the SDIO function and arrange for the tty layer to
+ * give up on that port ASAP.
+ * Beware: the lock ordering is critical.
+ */
+ mutex_lock(&port->open_lock);
+ mutex_lock(&port->func_lock);
+ func = port->func;
+ sdio_claim_host(func);
+ port->func = NULL;
+ mutex_unlock(&port->func_lock);
+ if (port->opened)
+ tty_hangup(port->tty);
+ mutex_unlock(&port->open_lock);
+ sdio_release_irq(func);
+ sdio_disable_func(func);
+ sdio_release_host(func);
+
+ sdio_uart_port_put(port);
+}
+
+static int sdio_uart_claim_func(struct sdio_uart_port *port)
+{
+ mutex_lock(&port->func_lock);
+ if (unlikely(!port->func)) {
+ mutex_unlock(&port->func_lock);
+ return -ENODEV;
+ }
+ if (likely(port->in_sdio_uart_irq != current))
+ sdio_claim_host(port->func);
+ mutex_unlock(&port->func_lock);
+ return 0;
+}
+
+static inline void sdio_uart_release_func(struct sdio_uart_port *port)
+{
+ if (likely(port->in_sdio_uart_irq != current))
+ sdio_release_host(port->func);
+}
+
+static inline unsigned int sdio_in(struct sdio_uart_port *port, int offset)
+{
+ unsigned char c;
+ c = sdio_readb(port->func, port->regs_offset + offset, NULL);
+ return c;
+}
+
+static inline void sdio_out(struct sdio_uart_port *port, int offset, int value)
+{
+ sdio_writeb(port->func, value, port->regs_offset + offset, NULL);
+}
+
+static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port)
+{
+ unsigned char status;
+ unsigned int ret;
+
+ status = sdio_in(port, UART_MSR);
+
+ ret = 0;
+ if (status & UART_MSR_DCD)
+ ret |= TIOCM_CAR;
+ if (status & UART_MSR_RI)
+ ret |= TIOCM_RNG;
+ if (status & UART_MSR_DSR)
+ ret |= TIOCM_DSR;
+ if (status & UART_MSR_CTS)
+ ret |= TIOCM_CTS;
+ return ret;
+}
+
+static void sdio_uart_write_mctrl(struct sdio_uart_port *port, unsigned int mctrl)
+{
+ unsigned char mcr = 0;
+
+ if (mctrl & TIOCM_RTS)
+ mcr |= UART_MCR_RTS;
+ if (mctrl & TIOCM_DTR)
+ mcr |= UART_MCR_DTR;
+ if (mctrl & TIOCM_OUT1)
+ mcr |= UART_MCR_OUT1;
+ if (mctrl & TIOCM_OUT2)
+ mcr |= UART_MCR_OUT2;
+ if (mctrl & TIOCM_LOOP)
+ mcr |= UART_MCR_LOOP;
+
+ sdio_out(port, UART_MCR, mcr);
+}
+
+static inline void sdio_uart_update_mctrl(struct sdio_uart_port *port,
+ unsigned int set, unsigned int clear)
+{
+ unsigned int old;
+
+ old = port->mctrl;
+ port->mctrl = (old & ~clear) | set;
+ if (old != port->mctrl)
+ sdio_uart_write_mctrl(port, port->mctrl);
+}
+
+#define sdio_uart_set_mctrl(port, x) sdio_uart_update_mctrl(port, x, 0)
+#define sdio_uart_clear_mctrl(port, x) sdio_uart_update_mctrl(port, 0, x)
+
+static void sdio_uart_change_speed(struct sdio_uart_port *port,
+ struct ktermios *termios,
+ struct ktermios *old)
+{
+ unsigned char cval, fcr = 0;
+ unsigned int baud, quot;
+
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ cval = UART_LCR_WLEN5;
+ break;
+ case CS6:
+ cval = UART_LCR_WLEN6;
+ break;
+ case CS7:
+ cval = UART_LCR_WLEN7;
+ break;
+ default:
+ case CS8:
+ cval = UART_LCR_WLEN8;
+ break;
+ }
+
+ if (termios->c_cflag & CSTOPB)
+ cval |= UART_LCR_STOP;
+ if (termios->c_cflag & PARENB)
+ cval |= UART_LCR_PARITY;
+ if (!(termios->c_cflag & PARODD))
+ cval |= UART_LCR_EPAR;
+
+ for (;;) {
+ baud = tty_termios_baud_rate(termios);
+ if (baud == 0)
+ baud = 9600; /* Special case: B0 rate. */
+ if (baud <= port->uartclk)
+ break;
+ /*
+ * Oops, the quotient was zero. Try again with the old
+ * baud rate if possible, otherwise default to 9600.
+ */
+ termios->c_cflag &= ~CBAUD;
+ if (old) {
+ termios->c_cflag |= old->c_cflag & CBAUD;
+ old = NULL;
+ } else
+ termios->c_cflag |= B9600;
+ }
+ quot = (2 * port->uartclk + baud) / (2 * baud);
+
+ if (baud < 2400)
+ fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
+ else
+ fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10;
+
+ port->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ port->read_status_mask |= UART_LSR_BI;
+
+ /*
+ * Characters to ignore
+ */
+ port->ignore_status_mask = 0;
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
+ if (termios->c_iflag & IGNBRK) {
+ port->ignore_status_mask |= UART_LSR_BI;
+ /*
+ * If we're ignoring parity and break indicators,
+ * ignore overruns too (for real raw support).
+ */
+ if (termios->c_iflag & IGNPAR)
+ port->ignore_status_mask |= UART_LSR_OE;
+ }
+
+ /*
+ * ignore all characters if CREAD is not set
+ */
+ if ((termios->c_cflag & CREAD) == 0)
+ port->ignore_status_mask |= UART_LSR_DR;
+
+ /*
+ * CTS flow control flag and modem status interrupts
+ */
+ port->ier &= ~UART_IER_MSI;
+ if ((termios->c_cflag & CRTSCTS) || !(termios->c_cflag & CLOCAL))
+ port->ier |= UART_IER_MSI;
+
+ port->lcr = cval;
+
+ sdio_out(port, UART_IER, port->ier);
+ sdio_out(port, UART_LCR, cval | UART_LCR_DLAB);
+ sdio_out(port, UART_DLL, quot & 0xff);
+ sdio_out(port, UART_DLM, quot >> 8);
+ sdio_out(port, UART_LCR, cval);
+ sdio_out(port, UART_FCR, fcr);
+
+ sdio_uart_write_mctrl(port, port->mctrl);
+}
+
+static void sdio_uart_start_tx(struct sdio_uart_port *port)
+{
+ if (!(port->ier & UART_IER_THRI)) {
+ port->ier |= UART_IER_THRI;
+ sdio_out(port, UART_IER, port->ier);
+ }
+}
+
+static void sdio_uart_stop_tx(struct sdio_uart_port *port)
+{
+ if (port->ier & UART_IER_THRI) {
+ port->ier &= ~UART_IER_THRI;
+ sdio_out(port, UART_IER, port->ier);
+ }
+}
+
+static void sdio_uart_stop_rx(struct sdio_uart_port *port)
+{
+ port->ier &= ~UART_IER_RLSI;
+ port->read_status_mask &= ~UART_LSR_DR;
+ sdio_out(port, UART_IER, port->ier);
+}
+
+static void sdio_uart_receive_chars(struct sdio_uart_port *port, unsigned int *status)
+{
+ struct tty_struct *tty = port->tty;
+ unsigned int ch, flag;
+ int max_count = 256;
+
+ do {
+ ch = sdio_in(port, UART_RX);
+ flag = TTY_NORMAL;
+ port->icount.rx++;
+
+ if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
+ UART_LSR_FE | UART_LSR_OE))) {
+ /*
+ * For statistics only
+ */
+ if (*status & UART_LSR_BI) {
+ *status &= ~(UART_LSR_FE | UART_LSR_PE);
+ port->icount.brk++;
+ } else if (*status & UART_LSR_PE)
+ port->icount.parity++;
+ else if (*status & UART_LSR_FE)
+ port->icount.frame++;
+ if (*status & UART_LSR_OE)
+ port->icount.overrun++;
+
+ /*
+ * Mask off conditions which should be ignored.
+ */
+ *status &= port->read_status_mask;
+ if (*status & UART_LSR_BI) {
+ flag = TTY_BREAK;
+ } else if (*status & UART_LSR_PE)
+ flag = TTY_PARITY;
+ else if (*status & UART_LSR_FE)
+ flag = TTY_FRAME;
+ }
+
+ if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0)
+ tty_insert_flip_char(tty, ch, flag);
+
+ /*
+ * Overrun is special. Since it's reported immediately,
+ * it doesn't affect the current character.
+ */
+ if (*status & ~port->ignore_status_mask & UART_LSR_OE)
+ tty_insert_flip_char(tty, 0, TTY_OVERRUN);
+
+ *status = sdio_in(port, UART_LSR);
+ } while ((*status & UART_LSR_DR) && (max_count-- > 0));
+ tty_flip_buffer_push(tty);
+}
+
+static void sdio_uart_transmit_chars(struct sdio_uart_port *port)
+{
+ struct circ_buf *xmit = &port->xmit;
+ int count;
+
+ if (port->x_char) {
+ sdio_out(port, UART_TX, port->x_char);
+ port->icount.tx++;
+ port->x_char = 0;
+ return;
+ }
+ if (circ_empty(xmit) || port->tty->stopped || port->tty->hw_stopped) {
+ sdio_uart_stop_tx(port);
+ return;
+ }
+
+ count = 16;
+ do {
+ sdio_out(port, UART_TX, xmit->buf[xmit->tail]);
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ port->icount.tx++;
+ if (circ_empty(xmit))
+ break;
+ } while (--count > 0);
+
+ if (circ_chars_pending(xmit) < WAKEUP_CHARS)
+ tty_wakeup(port->tty);
+
+ if (circ_empty(xmit))
+ sdio_uart_stop_tx(port);
+}
+
+static void sdio_uart_check_modem_status(struct sdio_uart_port *port)
+{
+ int status;
+
+ status = sdio_in(port, UART_MSR);
+
+ if ((status & UART_MSR_ANY_DELTA) == 0)
+ return;
+
+ if (status & UART_MSR_TERI)
+ port->icount.rng++;
+ if (status & UART_MSR_DDSR)
+ port->icount.dsr++;
+ if (status & UART_MSR_DDCD)
+ port->icount.dcd++;
+ if (status & UART_MSR_DCTS) {
+ port->icount.cts++;
+ if (port->tty->termios->c_cflag & CRTSCTS) {
+ int cts = (status & UART_MSR_CTS);
+ if (port->tty->hw_stopped) {
+ if (cts) {
+ port->tty->hw_stopped = 0;
+ sdio_uart_start_tx(port);
+ tty_wakeup(port->tty);
+ }
+ } else {
+ if (!cts) {
+ port->tty->hw_stopped = 1;
+ sdio_uart_stop_tx(port);
+ }
+ }
+ }
+ }
+}
+
+/*
+ * This handles the interrupt from one port.
+ */
+static void sdio_uart_irq(struct sdio_func *func)
+{
+ struct sdio_uart_port *port = sdio_get_drvdata(func);
+ unsigned int iir, lsr;
+
+ /*
+ * In a few places sdio_uart_irq() is called directly instead of
+ * waiting for the actual interrupt to be raised and the SDIO IRQ
+ * thread scheduled in order to reduce latency. However, some
+ * interaction with the tty core may end up calling us back
+ * (serial echo, flow control, etc.) through those same places
+ * causing undesirable effects. Let's stop the recursion here.
+ */
+ if (unlikely(port->in_sdio_uart_irq == current))
+ return;
+
+ iir = sdio_in(port, UART_IIR);
+ if (iir & UART_IIR_NO_INT)
+ return;
+
+ port->in_sdio_uart_irq = current;
+ lsr = sdio_in(port, UART_LSR);
+ if (lsr & UART_LSR_DR)
+ sdio_uart_receive_chars(port, &lsr);
+ sdio_uart_check_modem_status(port);
+ if (lsr & UART_LSR_THRE)
+ sdio_uart_transmit_chars(port);
+ port->in_sdio_uart_irq = NULL;
+}
+
+static int sdio_uart_startup(struct sdio_uart_port *port)
+{
+ unsigned long page;
+ int ret;
+
+ /*
+ * Set the TTY IO error marker - we will only clear this
+ * once we have successfully opened the port.
+ */
+ set_bit(TTY_IO_ERROR, &port->tty->flags);
+
+ /* Initialise and allocate the transmit buffer. */
+ page = __get_free_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+ port->xmit.buf = (unsigned char *)page;
+ circ_clear(&port->xmit);
+
+ ret = sdio_uart_claim_func(port);
+ if (ret)
+ goto err1;
+ ret = sdio_enable_func(port->func);
+ if (ret)
+ goto err2;
+ ret = sdio_claim_irq(port->func, sdio_uart_irq);
+ if (ret)
+ goto err3;
+
+ /*
+ * Clear the FIFO buffers and disable them.
+ * (they will be reenabled in sdio_change_speed())
+ */
+ sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO);
+ sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
+ UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
+ sdio_out(port, UART_FCR, 0);
+
+ /*
+ * Clear the interrupt registers.
+ */
+ (void) sdio_in(port, UART_LSR);
+ (void) sdio_in(port, UART_RX);
+ (void) sdio_in(port, UART_IIR);
+ (void) sdio_in(port, UART_MSR);
+
+ /*
+ * Now, initialize the UART
+ */
+ sdio_out(port, UART_LCR, UART_LCR_WLEN8);
+
+ port->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE;
+ port->mctrl = TIOCM_OUT2;
+
+ sdio_uart_change_speed(port, port->tty->termios, NULL);
+
+ if (port->tty->termios->c_cflag & CBAUD)
+ sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
+
+ if (port->tty->termios->c_cflag & CRTSCTS)
+ if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS))
+ port->tty->hw_stopped = 1;
+
+ clear_bit(TTY_IO_ERROR, &port->tty->flags);
+
+ /* Kick the IRQ handler once while we're still holding the host lock */
+ sdio_uart_irq(port->func);
+
+ sdio_uart_release_func(port);
+ return 0;
+
+err3:
+ sdio_disable_func(port->func);
+err2:
+ sdio_uart_release_func(port);
+err1:
+ free_page((unsigned long)port->xmit.buf);
+ return ret;
+}
+
+static void sdio_uart_shutdown(struct sdio_uart_port *port)
+{
+ int ret;
+
+ ret = sdio_uart_claim_func(port);
+ if (ret)
+ goto skip;
+
+ sdio_uart_stop_rx(port);
+
+ /* TODO: wait here for TX FIFO to drain */
+
+ /* Turn off DTR and RTS early. */
+ if (port->tty->termios->c_cflag & HUPCL)
+ sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS);
+
+ /* Disable interrupts from this port */
+ sdio_release_irq(port->func);
+ port->ier = 0;
+ sdio_out(port, UART_IER, 0);
+
+ sdio_uart_clear_mctrl(port, TIOCM_OUT2);
+
+ /* Disable break condition and FIFOs. */
+ port->lcr &= ~UART_LCR_SBC;
+ sdio_out(port, UART_LCR, port->lcr);
+ sdio_out(port, UART_FCR, UART_FCR_ENABLE_FIFO |
+ UART_FCR_CLEAR_RCVR |
+ UART_FCR_CLEAR_XMIT);
+ sdio_out(port, UART_FCR, 0);
+
+ sdio_disable_func(port->func);
+
+ sdio_uart_release_func(port);
+
+skip:
+ /* Free the transmit buffer page. */
+ free_page((unsigned long)port->xmit.buf);
+}
+
+static int sdio_uart_open (struct tty_struct *tty, struct file * filp)
+{
+ struct sdio_uart_port *port;
+ int ret;
+
+ port = sdio_uart_port_get(tty->index);
+ if (!port)
+ return -ENODEV;
+
+ mutex_lock(&port->open_lock);
+
+ /*
+ * Make sure not to mess up with a dead port
+ * which has not been closed yet.
+ */
+ if (tty->driver_data && tty->driver_data != port) {
+ mutex_unlock(&port->open_lock);
+ sdio_uart_port_put(port);
+ return -EBUSY;
+ }
+
+ if (!port->opened) {
+ tty->driver_data = port;
+ port->tty = tty;
+ ret = sdio_uart_startup(port);
+ if (ret) {
+ tty->driver_data = NULL;
+ port->tty = NULL;
+ mutex_unlock(&port->open_lock);
+ sdio_uart_port_put(port);
+ return ret;
+ }
+ }
+ port->opened++;
+ mutex_unlock(&port->open_lock);
+ return 0;
+}
+
+static void sdio_uart_close(struct tty_struct *tty, struct file * filp)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+
+ if (!port)
+ return;
+
+ mutex_lock(&port->open_lock);
+ BUG_ON(!port->opened);
+
+ /*
+ * This is messy. The tty layer calls us even when open()
+ * returned an error. Ignore this close request if tty->count
+ * is larger than port->count.
+ */
+ if (tty->count > port->opened) {
+ mutex_unlock(&port->open_lock);
+ return;
+ }
+
+ if (--port->opened == 0) {
+ tty->closing = 1;
+ sdio_uart_shutdown(port);
+ tty_ldisc_flush(tty);
+ port->tty = NULL;
+ tty->driver_data = NULL;
+ tty->closing = 0;
+ }
+ mutex_unlock(&port->open_lock);
+ sdio_uart_port_put(port);
+}
+
+static int sdio_uart_write(struct tty_struct * tty, const unsigned char *buf,
+ int count)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+ struct circ_buf *circ = &port->xmit;
+ int c, ret = 0;
+
+ if (!port->func)
+ return -ENODEV;
+
+ spin_lock(&port->write_lock);
+ while (1) {
+ c = CIRC_SPACE_TO_END(circ->head, circ->tail, UART_XMIT_SIZE);
+ if (count < c)
+ c = count;
+ if (c <= 0)
+ break;
+ memcpy(circ->buf + circ->head, buf, c);
+ circ->head = (circ->head + c) & (UART_XMIT_SIZE - 1);
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+ spin_unlock(&port->write_lock);
+
+ if ( !(port->ier & UART_IER_THRI)) {
+ int err = sdio_uart_claim_func(port);
+ if (!err) {
+ sdio_uart_start_tx(port);
+ sdio_uart_irq(port->func);
+ sdio_uart_release_func(port);
+ } else
+ ret = err;
+ }
+
+ return ret;
+}
+
+static int sdio_uart_write_room(struct tty_struct *tty)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+ return port ? circ_chars_free(&port->xmit) : 0;
+}
+
+static int sdio_uart_chars_in_buffer(struct tty_struct *tty)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+ return port ? circ_chars_pending(&port->xmit) : 0;
+}
+
+static void sdio_uart_send_xchar(struct tty_struct *tty, char ch)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+
+ port->x_char = ch;
+ if (ch && !(port->ier & UART_IER_THRI)) {
+ if (sdio_uart_claim_func(port) != 0)
+ return;
+ sdio_uart_start_tx(port);
+ sdio_uart_irq(port->func);
+ sdio_uart_release_func(port);
+ }
+}
+
+static void sdio_uart_throttle(struct tty_struct *tty)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+
+ if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
+ return;
+
+ if (sdio_uart_claim_func(port) != 0)
+ return;
+
+ if (I_IXOFF(tty)) {
+ port->x_char = STOP_CHAR(tty);
+ sdio_uart_start_tx(port);
+ }
+
+ if (tty->termios->c_cflag & CRTSCTS)
+ sdio_uart_clear_mctrl(port, TIOCM_RTS);
+
+ sdio_uart_irq(port->func);
+ sdio_uart_release_func(port);
+}
+
+static void sdio_uart_unthrottle(struct tty_struct *tty)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+
+ if (!I_IXOFF(tty) && !(tty->termios->c_cflag & CRTSCTS))
+ return;
+
+ if (sdio_uart_claim_func(port) != 0)
+ return;
+
+ if (I_IXOFF(tty)) {
+ if (port->x_char) {
+ port->x_char = 0;
+ } else {
+ port->x_char = START_CHAR(tty);
+ sdio_uart_start_tx(port);
+ }
+ }
+
+ if (tty->termios->c_cflag & CRTSCTS)
+ sdio_uart_set_mctrl(port, TIOCM_RTS);
+
+ sdio_uart_irq(port->func);
+ sdio_uart_release_func(port);
+}
+
+static void sdio_uart_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+ unsigned int cflag = tty->termios->c_cflag;
+
+#define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
+
+ if ((cflag ^ old_termios->c_cflag) == 0 &&
+ RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0)
+ return;
+
+ if (sdio_uart_claim_func(port) != 0)
+ return;
+
+ sdio_uart_change_speed(port, tty->termios, old_termios);
+
+ /* Handle transition to B0 status */
+ if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD))
+ sdio_uart_clear_mctrl(port, TIOCM_RTS | TIOCM_DTR);
+
+ /* Handle transition away from B0 status */
+ if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) {
+ unsigned int mask = TIOCM_DTR;
+ if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags))
+ mask |= TIOCM_RTS;
+ sdio_uart_set_mctrl(port, mask);
+ }
+
+ /* Handle turning off CRTSCTS */
+ if ((old_termios->c_cflag & CRTSCTS) && !(cflag & CRTSCTS)) {
+ tty->hw_stopped = 0;
+ sdio_uart_start_tx(port);
+ }
+
+ /* Handle turning on CRTSCTS */
+ if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
+ if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) {
+ tty->hw_stopped = 1;
+ sdio_uart_stop_tx(port);
+ }
+ }
+
+ sdio_uart_release_func(port);
+}
+
+static void sdio_uart_break_ctl(struct tty_struct *tty, int break_state)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+
+ if (sdio_uart_claim_func(port) != 0)
+ return;
+
+ if (break_state == -1)
+ port->lcr |= UART_LCR_SBC;
+ else
+ port->lcr &= ~UART_LCR_SBC;
+ sdio_out(port, UART_LCR, port->lcr);
+
+ sdio_uart_release_func(port);
+}
+
+static int sdio_uart_tiocmget(struct tty_struct *tty, struct file *file)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+ int result;
+
+ result = sdio_uart_claim_func(port);
+ if (!result) {
+ result = port->mctrl | sdio_uart_get_mctrl(port);
+ sdio_uart_release_func(port);
+ }
+
+ return result;
+}
+
+static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file,
+ unsigned int set, unsigned int clear)
+{
+ struct sdio_uart_port *port = tty->driver_data;
+ int result;
+
+ result =sdio_uart_claim_func(port);
+ if(!result) {
+ sdio_uart_update_mctrl(port, set, clear);
+ sdio_uart_release_func(port);
+ }
+
+ return result;
+}
+
+static int sdio_uart_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int i, len = 0;
+ off_t begin = 0;
+
+ len += sprintf(page, "serinfo:1.0 driver%s%s revision:%s\n",
+ "", "", "");
+ for (i = 0; i < UART_NR && len < PAGE_SIZE - 96; i++) {
+ struct sdio_uart_port *port = sdio_uart_port_get(i);
+ if (port) {
+ len += sprintf(page+len, "%d: uart:SDIO", i);
+ if(capable(CAP_SYS_ADMIN)) {
+ len += sprintf(page + len, " tx:%d rx:%d",
+ port->icount.tx, port->icount.rx);
+ if (port->icount.frame)
+ len += sprintf(page + len, " fe:%d",
+ port->icount.frame);
+ if (port->icount.parity)
+ len += sprintf(page + len, " pe:%d",
+ port->icount.parity);
+ if (port->icount.brk)
+ len += sprintf(page + len, " brk:%d",
+ port->icount.brk);
+ if (port->icount.overrun)
+ len += sprintf(page + len, " oe:%d",
+ port->icount.overrun);
+ if (port->icount.cts)
+ len += sprintf(page + len, " cts:%d",
+ port->icount.cts);
+ if (port->icount.dsr)
+ len += sprintf(page + len, " dsr:%d",
+ port->icount.dsr);
+ if (port->icount.rng)
+ len += sprintf(page + len, " rng:%d",
+ port->icount.rng);
+ if (port->icount.dcd)
+ len += sprintf(page + len, " dcd:%d",
+ port->icount.dcd);
+ }
+ strcat(page, "\n");
+ len++;
+ sdio_uart_port_put(port);
+ }
+
+ if (len + begin > off + count)
+ goto done;
+ if (len + begin < off) {
+ begin += len;
+ len = 0;
+ }
+ }
+ *eof = 1;
+
+done:
+ if (off >= len + begin)
+ return 0;
+ *start = page + (off - begin);
+ return (count < begin + len - off) ? count : (begin + len - off);
+}
+
+static const struct tty_operations sdio_uart_ops = {
+ .open = sdio_uart_open,
+ .close = sdio_uart_close,
+ .write = sdio_uart_write,
+ .write_room = sdio_uart_write_room,
+ .chars_in_buffer = sdio_uart_chars_in_buffer,
+ .send_xchar = sdio_uart_send_xchar,
+ .throttle = sdio_uart_throttle,
+ .unthrottle = sdio_uart_unthrottle,
+ .set_termios = sdio_uart_set_termios,
+ .break_ctl = sdio_uart_break_ctl,
+ .tiocmget = sdio_uart_tiocmget,
+ .tiocmset = sdio_uart_tiocmset,
+ .read_proc = sdio_uart_read_proc,
+};
+
+static struct tty_driver *sdio_uart_tty_driver;
+
+static int sdio_uart_probe(struct sdio_func *func,
+ const struct sdio_device_id *id)
+{
+ struct sdio_uart_port *port;
+ int ret;
+
+ port = kzalloc(sizeof(struct sdio_uart_port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+
+ if (func->class == SDIO_CLASS_UART) {
+ printk(KERN_WARNING "%s: need info on UART class basic setup\n",
+ sdio_func_id(func));
+ kfree(port);
+ return -ENOSYS;
+ } else if (func->class == SDIO_CLASS_GPS) {
+ /*
+ * We need tuple 0x91. It contains SUBTPL_SIOREG
+ * and SUBTPL_RCVCAPS.
+ */
+ struct sdio_func_tuple *tpl;
+ for (tpl = func->tuples; tpl; tpl = tpl->next) {
+ if (tpl->code != 0x91)
+ continue;
+ if (tpl->size < 10)
+ continue;
+ if (tpl->data[1] == 0) /* SUBTPL_SIOREG */
+ break;
+ }
+ if (!tpl) {
+ printk(KERN_WARNING
+ "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n",
+ sdio_func_id(func));
+ kfree(port);
+ return -EINVAL;
+ }
+ printk(KERN_DEBUG "%s: Register ID = 0x%02x, Exp ID = 0x%02x\n",
+ sdio_func_id(func), tpl->data[2], tpl->data[3]);
+ port->regs_offset = (tpl->data[4] << 0) |
+ (tpl->data[5] << 8) |
+ (tpl->data[6] << 16);
+ printk(KERN_DEBUG "%s: regs offset = 0x%x\n",
+ sdio_func_id(func), port->regs_offset);
+ port->uartclk = tpl->data[7] * 115200;
+ if (port->uartclk == 0)
+ port->uartclk = 115200;
+ printk(KERN_DEBUG "%s: clk %d baudcode %u 4800-div %u\n",
+ sdio_func_id(func), port->uartclk,
+ tpl->data[7], tpl->data[8] | (tpl->data[9] << 8));
+ } else {
+ kfree(port);
+ return -EINVAL;
+ }
+
+ port->func = func;
+ sdio_set_drvdata(func, port);
+
+ ret = sdio_uart_add_port(port);
+ if (ret) {
+ kfree(port);
+ } else {
+ struct device *dev;
+ dev = tty_register_device(sdio_uart_tty_driver, port->index, &func->dev);
+ if (IS_ERR(dev)) {
+ sdio_uart_port_remove(port);
+ ret = PTR_ERR(dev);
+ }
+ }
+
+ return ret;
+}
+
+static void sdio_uart_remove(struct sdio_func *func)
+{
+ struct sdio_uart_port *port = sdio_get_drvdata(func);
+
+ tty_unregister_device(sdio_uart_tty_driver, port->index);
+ sdio_uart_port_remove(port);
+}
+
+static const struct sdio_device_id sdio_uart_ids[] = {
+ { SDIO_DEVICE_CLASS(SDIO_CLASS_UART) },
+ { SDIO_DEVICE_CLASS(SDIO_CLASS_GPS) },
+ { /* end: all zeroes */ },
+};
+
+MODULE_DEVICE_TABLE(sdio, sdio_uart_ids);
+
+static struct sdio_driver sdio_uart_driver = {
+ .probe = sdio_uart_probe,
+ .remove = sdio_uart_remove,
+ .name = "sdio_uart",
+ .id_table = sdio_uart_ids,
+};
+
+static int __init sdio_uart_init(void)
+{
+ int ret;
+ struct tty_driver *tty_drv;
+
+ sdio_uart_tty_driver = tty_drv = alloc_tty_driver(UART_NR);
+ if (!tty_drv)
+ return -ENOMEM;
+
+ tty_drv->owner = THIS_MODULE;
+ tty_drv->driver_name = "sdio_uart";
+ tty_drv->name = "ttySDIO";
+ tty_drv->major = 0; /* dynamically allocated */
+ tty_drv->minor_start = 0;
+ tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
+ tty_drv->subtype = SERIAL_TYPE_NORMAL;
+ tty_drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+ tty_drv->init_termios = tty_std_termios;
+ tty_drv->init_termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
+ tty_drv->init_termios.c_ispeed = 4800;
+ tty_drv->init_termios.c_ospeed = 4800;
+ tty_set_operations(tty_drv, &sdio_uart_ops);
+
+ ret = tty_register_driver(tty_drv);
+ if (ret)
+ goto err1;
+
+ ret = sdio_register_driver(&sdio_uart_driver);
+ if (ret)
+ goto err2;
+
+ return 0;
+
+err2:
+ tty_unregister_driver(tty_drv);
+err1:
+ put_tty_driver(tty_drv);
+ return ret;
+}
+
+static void __exit sdio_uart_exit(void)
+{
+ sdio_unregister_driver(&sdio_uart_driver);
+ tty_unregister_driver(sdio_uart_tty_driver);
+ put_tty_driver(sdio_uart_tty_driver);
+}
+
+module_init(sdio_uart_init);
+module_exit(sdio_uart_exit);
+
+MODULE_AUTHOR("Nicolas Pitre");
+MODULE_LICENSE("GPL");
--- a/drivers/mmc/core/Makefile
+++ b/drivers/mmc/core/Makefile
@@ -8,5 +8,7 @@ endif
obj-$(CONFIG_MMC) += mmc_core.o
mmc_core-y := core.o sysfs.o bus.o host.o \
- mmc.o mmc_ops.o sd.o sd_ops.o
+ mmc.o mmc_ops.o sd.o sd_ops.o \
+ sdio.o sdio_ops.o sdio_bus.o \
+ sdio_cis.o sdio_io.o sdio_irq.o
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