161 lines
4.2 KiB
Diff
161 lines
4.2 KiB
Diff
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Subject: [RFC][PATCH] mtd: bcm47xxsflash: writing support
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Date: Wed, 22 May 2013 14:39:02 +0200
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---
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drivers/mtd/devices/bcm47xxsflash.c | 130 +++++++++++++++++++++++++++++++++--
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1 file changed, 126 insertions(+), 4 deletions(-)
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--- a/drivers/mtd/devices/bcm47xxsflash.c
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+++ b/drivers/mtd/devices/bcm47xxsflash.c
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@@ -116,6 +116,127 @@ static int bcm47xxsflash_read(struct mtd
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return len;
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}
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+static int bcm47xxsflash_write_st(struct mtd_info *mtd, u32 offset, size_t len,
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+ const u_char *buf)
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+{
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+ struct bcm47xxsflash *b47s = mtd->priv;
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+ int written = 0;
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+
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+ /* Enable writes */
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+ bcm47xxsflash_cmd(b47s, OPCODE_ST_WREN);
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+
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+ /* Write first byte */
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+ b47s->cc_write(b47s, BCMA_CC_FLASHADDR, offset);
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+ b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++);
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+
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+ /* Program page */
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+ if (b47s->bcma_cc->core->id.rev < 20) {
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+ bcm47xxsflash_cmd(b47s, OPCODE_ST_PP);
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+ return 1; /* 1B written */
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+ }
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+
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+ /* Program page and set CSA (on newer chips we can continue writing) */
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+ bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | OPCODE_ST_PP);
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+ offset++;
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+ len--;
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+ written++;
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+
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+ while (len > 0) {
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+ /* Page boundary, another function call is needed */
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+ if ((offset & 0xFF) == 0)
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+ break;
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+
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+ bcm47xxsflash_cmd(b47s, OPCODE_ST_CSA | *buf++);
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+ offset++;
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+ len--;
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+ written++;
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+ }
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+
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+ /* All done, drop CSA & poll */
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+ b47s->cc_write(b47s, BCMA_CC_FLASHCTL, 0);
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+ udelay(1);
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+ if (bcm47xxsflash_poll(b47s, HZ / 10))
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+ pr_err("Flash rejected dropping CSA\n");
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+
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+ return written;
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+}
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+
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+static int bcm47xxsflash_write_at(struct mtd_info *mtd, u32 offset, size_t len,
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+ const u_char *buf)
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+{
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+ struct bcm47xxsflash *b47s = mtd->priv;
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+ u32 mask = b47s->blocksize - 1;
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+ u32 page = (offset & ~mask) << 1;
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+ u32 byte = offset & mask;
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+ int written = 0;
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+
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+ /* If we don't overwrite whole page, read it to the buffer first */
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+ if (byte || (len < b47s->blocksize)) {
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+ int err;
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+
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+ b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page);
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+ bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_LOAD);
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+ /* 250 us for AT45DB321B */
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+ err = bcm47xxsflash_poll(b47s, HZ / 1000);
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+ if (err) {
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+ pr_err("Timeout reading page 0x%X info buffer\n", page);
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+ return err;
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+ }
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+ }
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+
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+ /* Change buffer content with our data */
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+ while (len > 0) {
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+ /* Page boundary, another function call is needed */
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+ if (byte == b47s->blocksize)
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+ break;
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+
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+ b47s->cc_write(b47s, BCMA_CC_FLASHADDR, byte++);
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+ b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++);
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+ bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_WRITE);
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+ len--;
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+ written++;
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+ }
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+
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+ /* Program page with the buffer content */
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+ b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page);
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+ bcm47xxsflash_cmd(b47s, OPCODE_AT_BUF1_PROGRAM);
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+
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+ return written;
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+}
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+
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+static int bcm47xxsflash_write(struct mtd_info *mtd, loff_t to, size_t len,
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+ size_t *retlen, const u_char *buf)
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+{
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+ struct bcm47xxsflash *b47s = mtd->priv;
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+ int written;
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+
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+ /* Writing functions can return without writing all passed data, for
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+ * example when the hardware is too old or when we git page boundary.
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+ */
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+ while (len > 0) {
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+ switch (b47s->type) {
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+ case BCM47XXSFLASH_TYPE_ST:
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+ written = bcm47xxsflash_write_st(mtd, to, len, buf);
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+ break;
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+ case BCM47XXSFLASH_TYPE_ATMEL:
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+ written = bcm47xxsflash_write_at(mtd, to, len, buf);
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+ break;
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+ default:
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+ BUG_ON(1);
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+ }
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+ if (written < 0) {
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+ pr_err("Error writing at offset 0x%llX\n", to);
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+ return written;
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+ }
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+ to += (loff_t)written;
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+ len -= written;
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+ *retlen += written;
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+ buf += written;
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+ }
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+
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+ return 0;
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+}
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+
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static void bcm47xxsflash_fill_mtd(struct bcm47xxsflash *b47s)
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{
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struct mtd_info *mtd = &b47s->mtd;
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@@ -123,16 +244,17 @@ static void bcm47xxsflash_fill_mtd(struc
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mtd->priv = b47s;
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mtd->name = "bcm47xxsflash";
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mtd->owner = THIS_MODULE;
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- mtd->type = MTD_ROM;
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- /* TODO: implement writing support and verify/change following code */
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- mtd->flags = MTD_CAP_ROM;
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+ mtd->type = MTD_NORFLASH;
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+ mtd->flags = MTD_CAP_NORFLASH;
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mtd->size = b47s->size;
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mtd->erasesize = b47s->blocksize;
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- mtd->writebufsize = mtd->writesize = 1;
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+ mtd->writesize = 1;
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+ mtd->writebufsize = 1;
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mtd->_erase = bcm47xxsflash_erase;
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mtd->_read = bcm47xxsflash_read;
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+ mtd->_write = bcm47xxsflash_write;
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}
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/**************************************************
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