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Openwrt/target/linux/ramips/patches-5.4/0300-mtd-rawnand-add-driver-support-for-MT7621-nand-flash.patch
Anton Ryzhov df469befdc ramips: fix kernel oops in mt7621_nfc_write_page_hwecc 
`mt7621_nfc_write_page_hwecc` may be called with `buf=NULL`, but
`mt7621_nfc_check_empty_page` always tries to read it.
That caused Oops:
`Unable to handle kernel paging request at virtual address 00000000`

Fixes: FS#3416
Signed-off-by: Anton Ryzhov <anton@ryzhov.me>
2020-11-04 22:08:11 +08:00

1401 lines
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From e84e2430ee0e483842b4ff013ae8a6e7e2fa2734 Mon Sep 17 00:00:00 2001
From: Weijie Gao <weijie.gao@mediatek.com>
Date: Wed, 1 Apr 2020 02:07:58 +0800
Subject: [PATCH 1/2] mtd: rawnand: add driver support for MT7621 nand
flash controller
This patch adds NAND flash controller driver for MediaTek MT7621 SoC.
The NAND flash controller is similar with controllers described in
mtk_nand.c, except that the controller from MT7621 doesn't support DMA
transmission, and some registers' offset and fields are different.
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
---
drivers/mtd/nand/raw/Kconfig | 8 +
drivers/mtd/nand/raw/Makefile | 1 +
drivers/mtd/nand/raw/mt7621_nand.c | 1348 ++++++++++++++++++++++++++++++++++++
3 files changed, 1357 insertions(+)
create mode 100644 drivers/mtd/nand/raw/mt7621_nand.c
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -391,6 +391,14 @@ config MTD_NAND_QCOM
Enables support for NAND flash chips on SoCs containing the EBI2 NAND
controller. This controller is found on IPQ806x SoC.
+config MTD_NAND_MT7621
+ tristate "MT7621 NAND controller"
+ depends on SOC_MT7621 || COMPILE_TEST
+ depends on HAS_IOMEM
+ help
+ Enables support for NAND controller on MT7621 SoC.
+ This driver uses PIO mode for data transmission instead of DMA mode.
+
config MTD_NAND_MTK
tristate "MTK NAND controller"
depends on ARCH_MEDIATEK || COMPILE_TEST
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_MTD_NAND_SUNXI) += sunxi_n
obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
+obj-$(CONFIG_MTD_NAND_MT7621) += mt7621_nand.o
obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
obj-$(CONFIG_MTD_NAND_MXIC) += mxic_nand.o
obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
--- /dev/null
+++ b/drivers/mtd/nand/raw/mt7621_nand.c
@@ -0,0 +1,1350 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * MediaTek MT7621 NAND Flash Controller driver
+ *
+ * Copyright (C) 2020 MediaTek Inc. All Rights Reserved.
+ *
+ * Author: Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/sizes.h>
+#include <linux/iopoll.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/platform_device.h>
+#include <asm/addrspace.h>
+
+/* NFI core registers */
+#define NFI_CNFG 0x000
+#define CNFG_OP_MODE_S 12
+#define CNFG_OP_MODE_M GENMASK(14, 12)
+#define CNFG_OP_CUSTOM 6
+#define CNFG_AUTO_FMT_EN BIT(9)
+#define CNFG_HW_ECC_EN BIT(8)
+#define CNFG_BYTE_RW BIT(6)
+#define CNFG_READ_MODE BIT(1)
+
+#define NFI_PAGEFMT 0x004
+#define PAGEFMT_FDM_ECC_S 12
+#define PAGEFMT_FDM_ECC_M GENMASK(15, 12)
+#define PAGEFMT_FDM_S 8
+#define PAGEFMT_FDM_M GENMASK(11, 8)
+#define PAGEFMT_SPARE_S 4
+#define PAGEFMT_SPARE_M GENMASK(5, 4)
+#define PAGEFMT_PAGE_S 0
+#define PAGEFMT_PAGE_M GENMASK(1, 0)
+
+#define NFI_CON 0x008
+#define CON_NFI_SEC_S 12
+#define CON_NFI_SEC_M GENMASK(15, 12)
+#define CON_NFI_BWR BIT(9)
+#define CON_NFI_BRD BIT(8)
+#define CON_NFI_RST BIT(1)
+#define CON_FIFO_FLUSH BIT(0)
+
+#define NFI_ACCCON 0x00c
+#define ACCCON_POECS_S 28
+#define ACCCON_POECS_MAX 0x0f
+#define ACCCON_POECS_DEF 3
+#define ACCCON_PRECS_S 22
+#define ACCCON_PRECS_MAX 0x3f
+#define ACCCON_PRECS_DEF 3
+#define ACCCON_C2R_S 16
+#define ACCCON_C2R_MAX 0x3f
+#define ACCCON_C2R_DEF 7
+#define ACCCON_W2R_S 12
+#define ACCCON_W2R_MAX 0x0f
+#define ACCCON_W2R_DEF 7
+#define ACCCON_WH_S 8
+#define ACCCON_WH_MAX 0x0f
+#define ACCCON_WH_DEF 15
+#define ACCCON_WST_S 4
+#define ACCCON_WST_MAX 0x0f
+#define ACCCON_WST_DEF 15
+#define ACCCON_WST_MIN 3
+#define ACCCON_RLT_S 0
+#define ACCCON_RLT_MAX 0x0f
+#define ACCCON_RLT_DEF 15
+#define ACCCON_RLT_MIN 3
+
+#define NFI_CMD 0x020
+
+#define NFI_ADDRNOB 0x030
+#define ADDR_ROW_NOB_S 4
+#define ADDR_ROW_NOB_M GENMASK(6, 4)
+#define ADDR_COL_NOB_S 0
+#define ADDR_COL_NOB_M GENMASK(2, 0)
+
+#define NFI_COLADDR 0x034
+#define NFI_ROWADDR 0x038
+
+#define NFI_STRDATA 0x040
+#define STR_DATA BIT(0)
+
+#define NFI_CNRNB 0x044
+#define CB2R_TIME_S 4
+#define CB2R_TIME_M GENMASK(7, 4)
+#define STR_CNRNB BIT(0)
+
+#define NFI_DATAW 0x050
+#define NFI_DATAR 0x054
+
+#define NFI_PIO_DIRDY 0x058
+#define PIO_DIRDY BIT(0)
+
+#define NFI_STA 0x060
+#define STA_NFI_FSM_S 16
+#define STA_NFI_FSM_M GENMASK(19, 16)
+#define STA_FSM_CUSTOM_DATA 14
+#define STA_BUSY BIT(8)
+#define STA_ADDR BIT(1)
+#define STA_CMD BIT(0)
+
+#define NFI_ADDRCNTR 0x070
+#define SEC_CNTR_S 12
+#define SEC_CNTR_M GENMASK(15, 12)
+#define SEC_ADDR_S 0
+#define SEC_ADDR_M GENMASK(9, 0)
+
+#define NFI_CSEL 0x090
+#define CSEL_S 0
+#define CSEL_M GENMASK(1, 0)
+
+#define NFI_FDM0L 0x0a0
+#define NFI_FDML(n) (0x0a0 + ((n) << 3))
+
+#define NFI_FDM0M 0x0a4
+#define NFI_FDMM(n) (0x0a4 + ((n) << 3))
+
+#define NFI_MASTER_STA 0x210
+#define MAS_ADDR GENMASK(11, 9)
+#define MAS_RD GENMASK(8, 6)
+#define MAS_WR GENMASK(5, 3)
+#define MAS_RDDLY GENMASK(2, 0)
+
+/* ECC engine registers */
+#define ECC_ENCCON 0x000
+#define ENC_EN BIT(0)
+
+#define ECC_ENCCNFG 0x004
+#define ENC_CNFG_MSG_S 16
+#define ENC_CNFG_MSG_M GENMASK(28, 16)
+#define ENC_MODE_S 4
+#define ENC_MODE_M GENMASK(5, 4)
+#define ENC_MODE_NFI 1
+#define ENC_TNUM_S 0
+#define ENC_TNUM_M GENMASK(2, 0)
+
+#define ECC_ENCIDLE 0x00c
+#define ENC_IDLE BIT(0)
+
+#define ECC_DECCON 0x100
+#define DEC_EN BIT(0)
+
+#define ECC_DECCNFG 0x104
+#define DEC_EMPTY_EN BIT(31)
+#define DEC_CS_S 16
+#define DEC_CS_M GENMASK(28, 16)
+#define DEC_CON_S 12
+#define DEC_CON_M GENMASK(13, 12)
+#define DEC_CON_EL 2
+#define DEC_MODE_S 4
+#define DEC_MODE_M GENMASK(5, 4)
+#define DEC_MODE_NFI 1
+#define DEC_TNUM_S 0
+#define DEC_TNUM_M GENMASK(2, 0)
+
+#define ECC_DECIDLE 0x10c
+#define DEC_IDLE BIT(1)
+
+#define ECC_DECENUM 0x114
+#define ERRNUM_S 2
+#define ERRNUM_M GENMASK(3, 0)
+
+#define ECC_DECDONE 0x118
+#define DEC_DONE7 BIT(7)
+#define DEC_DONE6 BIT(6)
+#define DEC_DONE5 BIT(5)
+#define DEC_DONE4 BIT(4)
+#define DEC_DONE3 BIT(3)
+#define DEC_DONE2 BIT(2)
+#define DEC_DONE1 BIT(1)
+#define DEC_DONE0 BIT(0)
+
+#define ECC_DECEL(n) (0x11c + (n) * 4)
+#define DEC_EL_ODD_S 16
+#define DEC_EL_EVEN_S 0
+#define DEC_EL_M 0x1fff
+#define DEC_EL_BYTE_POS_S 3
+#define DEC_EL_BIT_POS_M GENMASK(3, 0)
+
+#define ECC_FDMADDR 0x13c
+
+/* ENCIDLE and DECIDLE */
+#define ECC_IDLE BIT(0)
+
+#define ACCTIMING(tpoecs, tprecs, tc2r, tw2r, twh, twst, trlt) \
+ ((tpoecs) << ACCCON_POECS_S | (tprecs) << ACCCON_PRECS_S | \
+ (tc2r) << ACCCON_C2R_S | (tw2r) << ACCCON_W2R_S | \
+ (twh) << ACCCON_WH_S | (twst) << ACCCON_WST_S | (trlt))
+
+#define MASTER_STA_MASK (MAS_ADDR | MAS_RD | MAS_WR | \
+ MAS_RDDLY)
+#define NFI_RESET_TIMEOUT 1000000
+#define NFI_CORE_TIMEOUT 500000
+#define ECC_ENGINE_TIMEOUT 500000
+
+#define ECC_SECTOR_SIZE 512
+#define ECC_PARITY_BITS 13
+
+#define NFI_FDM_SIZE 8
+
+#define MT7621_NFC_NAME "mt7621-nand"
+
+struct mt7621_nfc {
+ struct nand_controller controller;
+ struct nand_chip nand;
+ struct clk *nfi_clk;
+ struct device *dev;
+
+ void __iomem *nfi_regs;
+ void __iomem *ecc_regs;
+
+ u32 spare_per_sector;
+};
+
+static const u16 mt7621_nfi_page_size[] = { SZ_512, SZ_2K, SZ_4K };
+static const u8 mt7621_nfi_spare_size[] = { 16, 26, 27, 28 };
+static const u8 mt7621_ecc_strength[] = { 4, 6, 8, 10, 12 };
+
+static inline u32 nfi_read32(struct mt7621_nfc *nfc, u32 reg)
+{
+ return readl(nfc->nfi_regs + reg);
+}
+
+static inline void nfi_write32(struct mt7621_nfc *nfc, u32 reg, u32 val)
+{
+ writel(val, nfc->nfi_regs + reg);
+}
+
+static inline u16 nfi_read16(struct mt7621_nfc *nfc, u32 reg)
+{
+ return readw(nfc->nfi_regs + reg);
+}
+
+static inline void nfi_write16(struct mt7621_nfc *nfc, u32 reg, u16 val)
+{
+ writew(val, nfc->nfi_regs + reg);
+}
+
+static inline void ecc_write16(struct mt7621_nfc *nfc, u32 reg, u16 val)
+{
+ writew(val, nfc->ecc_regs + reg);
+}
+
+static inline u32 ecc_read32(struct mt7621_nfc *nfc, u32 reg)
+{
+ return readl(nfc->ecc_regs + reg);
+}
+
+static inline void ecc_write32(struct mt7621_nfc *nfc, u32 reg, u32 val)
+{
+ return writel(val, nfc->ecc_regs + reg);
+}
+
+static inline u8 *oob_fdm_ptr(struct nand_chip *nand, int sect)
+{
+ return nand->oob_poi + sect * NFI_FDM_SIZE;
+}
+
+static inline u8 *oob_ecc_ptr(struct mt7621_nfc *nfc, int sect)
+{
+ struct nand_chip *nand = &nfc->nand;
+
+ return nand->oob_poi + nand->ecc.steps * NFI_FDM_SIZE +
+ sect * (nfc->spare_per_sector - NFI_FDM_SIZE);
+}
+
+static inline u8 *page_data_ptr(struct nand_chip *nand, const u8 *buf,
+ int sect)
+{
+ return (u8 *)buf + sect * nand->ecc.size;
+}
+
+static int mt7621_ecc_wait_idle(struct mt7621_nfc *nfc, u32 reg)
+{
+ struct device *dev = nfc->dev;
+ u32 val;
+ int ret;
+
+ ret = readw_poll_timeout_atomic(nfc->ecc_regs + reg, val,
+ val & ECC_IDLE, 10,
+ ECC_ENGINE_TIMEOUT);
+ if (ret) {
+ dev_warn(dev, "ECC engine timed out entering idle mode\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int mt7621_ecc_decoder_wait_done(struct mt7621_nfc *nfc, u32 sect)
+{
+ struct device *dev = nfc->dev;
+ u32 val;
+ int ret;
+
+ ret = readw_poll_timeout_atomic(nfc->ecc_regs + ECC_DECDONE, val,
+ val & (1 << sect), 10,
+ ECC_ENGINE_TIMEOUT);
+
+ if (ret) {
+ dev_warn(dev, "ECC decoder for sector %d timed out\n",
+ sect);
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static void mt7621_ecc_encoder_op(struct mt7621_nfc *nfc, bool enable)
+{
+ mt7621_ecc_wait_idle(nfc, ECC_ENCIDLE);
+ ecc_write16(nfc, ECC_ENCCON, enable ? ENC_EN : 0);
+}
+
+static void mt7621_ecc_decoder_op(struct mt7621_nfc *nfc, bool enable)
+{
+ mt7621_ecc_wait_idle(nfc, ECC_DECIDLE);
+ ecc_write16(nfc, ECC_DECCON, enable ? DEC_EN : 0);
+}
+
+static int mt7621_ecc_correct_check(struct mt7621_nfc *nfc, u8 *sector_buf,
+ u8 *fdm_buf, u32 sect)
+{
+ struct nand_chip *nand = &nfc->nand;
+ u32 decnum, num_error_bits, fdm_end_bits;
+ u32 error_locations, error_bit_loc;
+ u32 error_byte_pos, error_bit_pos;
+ int bitflips = 0;
+ u32 i;
+
+ decnum = ecc_read32(nfc, ECC_DECENUM);
+ num_error_bits = (decnum >> (sect << ERRNUM_S)) & ERRNUM_M;
+ fdm_end_bits = (nand->ecc.size + NFI_FDM_SIZE) << 3;
+
+ if (!num_error_bits)
+ return 0;
+
+ if (num_error_bits == ERRNUM_M)
+ return -1;
+
+ for (i = 0; i < num_error_bits; i++) {
+ error_locations = ecc_read32(nfc, ECC_DECEL(i / 2));
+ error_bit_loc = (error_locations >> ((i % 2) * DEC_EL_ODD_S)) &
+ DEC_EL_M;
+ error_byte_pos = error_bit_loc >> DEC_EL_BYTE_POS_S;
+ error_bit_pos = error_bit_loc & DEC_EL_BIT_POS_M;
+
+ if (error_bit_loc < (nand->ecc.size << 3)) {
+ if (sector_buf) {
+ sector_buf[error_byte_pos] ^=
+ (1 << error_bit_pos);
+ }
+ } else if (error_bit_loc < fdm_end_bits) {
+ if (fdm_buf) {
+ fdm_buf[error_byte_pos - nand->ecc.size] ^=
+ (1 << error_bit_pos);
+ }
+ }
+
+ bitflips++;
+ }
+
+ return bitflips;
+}
+
+static int mt7621_nfc_wait_write_completion(struct mt7621_nfc *nfc,
+ struct nand_chip *nand)
+{
+ struct device *dev = nfc->dev;
+ u16 val;
+ int ret;
+
+ ret = readw_poll_timeout_atomic(nfc->nfi_regs + NFI_ADDRCNTR, val,
+ ((val & SEC_CNTR_M) >> SEC_CNTR_S) >= nand->ecc.steps, 10,
+ NFI_CORE_TIMEOUT);
+
+ if (ret) {
+ dev_warn(dev, "NFI core write operation timed out\n");
+ return -ETIMEDOUT;
+ }
+
+ return ret;
+}
+
+static void mt7621_nfc_hw_reset(struct mt7621_nfc *nfc)
+{
+ u32 val;
+ int ret;
+
+ /* reset all registers and force the NFI master to terminate */
+ nfi_write16(nfc, NFI_CON, CON_FIFO_FLUSH | CON_NFI_RST);
+
+ /* wait for the master to finish the last transaction */
+ ret = readw_poll_timeout(nfc->nfi_regs + NFI_MASTER_STA, val,
+ !(val & MASTER_STA_MASK), 50,
+ NFI_RESET_TIMEOUT);
+ if (ret) {
+ dev_warn(nfc->dev, "Failed to reset NFI master in %dms\n",
+ NFI_RESET_TIMEOUT);
+ }
+
+ /* ensure any status register affected by the NFI master is reset */
+ nfi_write16(nfc, NFI_CON, CON_FIFO_FLUSH | CON_NFI_RST);
+ nfi_write16(nfc, NFI_STRDATA, 0);
+}
+
+static inline void mt7621_nfc_hw_init(struct mt7621_nfc *nfc)
+{
+ u32 acccon;
+
+ /*
+ * CNRNB: nand ready/busy register
+ * -------------------------------
+ * 7:4: timeout register for polling the NAND busy/ready signal
+ * 0 : poll the status of the busy/ready signal after [7:4]*16 cycles.
+ */
+ nfi_write16(nfc, NFI_CNRNB, CB2R_TIME_M | STR_CNRNB);
+
+ mt7621_nfc_hw_reset(nfc);
+
+ /* Apply default access timing */
+ acccon = ACCTIMING(ACCCON_POECS_DEF, ACCCON_PRECS_DEF, ACCCON_C2R_DEF,
+ ACCCON_W2R_DEF, ACCCON_WH_DEF, ACCCON_WST_DEF,
+ ACCCON_RLT_DEF);
+
+ nfi_write32(nfc, NFI_ACCCON, acccon);
+}
+
+static int mt7621_nfc_send_command(struct mt7621_nfc *nfc, u8 command)
+{
+ struct device *dev = nfc->dev;
+ u32 val;
+ int ret;
+
+ nfi_write32(nfc, NFI_CMD, command);
+
+ ret = readl_poll_timeout_atomic(nfc->nfi_regs + NFI_STA, val,
+ !(val & STA_CMD), 10,
+ NFI_CORE_TIMEOUT);
+ if (ret) {
+ dev_warn(dev, "NFI core timed out entering command mode\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int mt7621_nfc_send_address_byte(struct mt7621_nfc *nfc, int addr)
+{
+ struct device *dev = nfc->dev;
+ u32 val;
+ int ret;
+
+ nfi_write32(nfc, NFI_COLADDR, addr);
+ nfi_write32(nfc, NFI_ROWADDR, 0);
+ nfi_write16(nfc, NFI_ADDRNOB, 1);
+
+ ret = readl_poll_timeout_atomic(nfc->nfi_regs + NFI_STA, val,
+ !(val & STA_ADDR), 10,
+ NFI_CORE_TIMEOUT);
+ if (ret) {
+ dev_warn(dev, "NFI core timed out entering address mode\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int mt7621_nfc_send_address(struct mt7621_nfc *nfc, const u8 *addr,
+ unsigned int naddrs)
+{
+ int ret;
+
+ while (naddrs) {
+ ret = mt7621_nfc_send_address_byte(nfc, *addr);
+ if (ret)
+ return ret;
+
+ addr++;
+ naddrs--;
+ }
+
+ return 0;
+}
+
+static void mt7621_nfc_wait_pio_ready(struct mt7621_nfc *nfc)
+{
+ struct device *dev = nfc->dev;
+ int ret;
+ u16 val;
+
+ ret = readw_poll_timeout_atomic(nfc->nfi_regs + NFI_PIO_DIRDY, val,
+ val & PIO_DIRDY, 10,
+ NFI_CORE_TIMEOUT);
+ if (ret < 0)
+ dev_err(dev, "NFI core PIO mode not ready\n");
+}
+
+static u32 mt7621_nfc_pio_read(struct mt7621_nfc *nfc, bool br)
+{
+ u32 reg;
+
+ /* after each byte read, the NFI_STA reg is reset by the hardware */
+ reg = (nfi_read32(nfc, NFI_STA) & STA_NFI_FSM_M) >> STA_NFI_FSM_S;
+ if (reg != STA_FSM_CUSTOM_DATA) {
+ reg = nfi_read16(nfc, NFI_CNFG);
+ reg |= CNFG_READ_MODE | CNFG_BYTE_RW;
+ if (!br)
+ reg &= ~CNFG_BYTE_RW;
+ nfi_write16(nfc, NFI_CNFG, reg);
+
+ /*
+ * set to max sector to allow the HW to continue reading over
+ * unaligned accesses
+ */
+ nfi_write16(nfc, NFI_CON, CON_NFI_SEC_M | CON_NFI_BRD);
+
+ /* trigger to fetch data */
+ nfi_write16(nfc, NFI_STRDATA, STR_DATA);
+ }
+
+ mt7621_nfc_wait_pio_ready(nfc);
+
+ return nfi_read32(nfc, NFI_DATAR);
+}
+
+static void mt7621_nfc_read_data(struct mt7621_nfc *nfc, u8 *buf, u32 len)
+{
+ while (((uintptr_t)buf & 3) && len) {
+ *buf = mt7621_nfc_pio_read(nfc, true);
+ buf++;
+ len--;
+ }
+
+ while (len >= 4) {
+ *(u32 *)buf = mt7621_nfc_pio_read(nfc, false);
+ buf += 4;
+ len -= 4;
+ }
+
+ while (len) {
+ *buf = mt7621_nfc_pio_read(nfc, true);
+ buf++;
+ len--;
+ }
+}
+
+static void mt7621_nfc_read_data_discard(struct mt7621_nfc *nfc, u32 len)
+{
+ while (len >= 4) {
+ mt7621_nfc_pio_read(nfc, false);
+ len -= 4;
+ }
+
+ while (len) {
+ mt7621_nfc_pio_read(nfc, true);
+ len--;
+ }
+}
+
+static void mt7621_nfc_pio_write(struct mt7621_nfc *nfc, u32 val, bool bw)
+{
+ u32 reg;
+
+ reg = (nfi_read32(nfc, NFI_STA) & STA_NFI_FSM_M) >> STA_NFI_FSM_S;
+ if (reg != STA_FSM_CUSTOM_DATA) {
+ reg = nfi_read16(nfc, NFI_CNFG);
+ reg &= ~(CNFG_READ_MODE | CNFG_BYTE_RW);
+ if (bw)
+ reg |= CNFG_BYTE_RW;
+ nfi_write16(nfc, NFI_CNFG, reg);
+
+ nfi_write16(nfc, NFI_CON, CON_NFI_SEC_M | CON_NFI_BWR);
+ nfi_write16(nfc, NFI_STRDATA, STR_DATA);
+ }
+
+ mt7621_nfc_wait_pio_ready(nfc);
+ nfi_write32(nfc, NFI_DATAW, val);
+}
+
+static void mt7621_nfc_write_data(struct mt7621_nfc *nfc, const u8 *buf,
+ u32 len)
+{
+ while (((uintptr_t)buf & 3) && len) {
+ mt7621_nfc_pio_write(nfc, *buf, true);
+ buf++;
+ len--;
+ }
+
+ while (len >= 4) {
+ mt7621_nfc_pio_write(nfc, *(const u32 *)buf, false);
+ buf += 4;
+ len -= 4;
+ }
+
+ while (len) {
+ mt7621_nfc_pio_write(nfc, *buf, true);
+ buf++;
+ len--;
+ }
+}
+
+static void mt7621_nfc_write_data_empty(struct mt7621_nfc *nfc, u32 len)
+{
+ while (len >= 4) {
+ mt7621_nfc_pio_write(nfc, 0xffffffff, false);
+ len -= 4;
+ }
+
+ while (len) {
+ mt7621_nfc_pio_write(nfc, 0xff, true);
+ len--;
+ }
+}
+
+static int mt7621_nfc_dev_ready(struct mt7621_nfc *nfc,
+ unsigned int timeout_ms)
+{
+ u32 val;
+
+ return readl_poll_timeout_atomic(nfc->nfi_regs + NFI_STA, val,
+ !(val & STA_BUSY), 10,
+ timeout_ms * 1000);
+}
+
+static int mt7621_nfc_exec_instr(struct nand_chip *nand,
+ const struct nand_op_instr *instr)
+{
+ struct mt7621_nfc *nfc = nand_get_controller_data(nand);
+
+ switch (instr->type) {
+ case NAND_OP_CMD_INSTR:
+ mt7621_nfc_hw_reset(nfc);
+ nfi_write16(nfc, NFI_CNFG, CNFG_OP_CUSTOM << CNFG_OP_MODE_S);
+ return mt7621_nfc_send_command(nfc, instr->ctx.cmd.opcode);
+ case NAND_OP_ADDR_INSTR:
+ return mt7621_nfc_send_address(nfc, instr->ctx.addr.addrs,
+ instr->ctx.addr.naddrs);
+ case NAND_OP_DATA_IN_INSTR:
+ mt7621_nfc_read_data(nfc, instr->ctx.data.buf.in,
+ instr->ctx.data.len);
+ return 0;
+ case NAND_OP_DATA_OUT_INSTR:
+ mt7621_nfc_write_data(nfc, instr->ctx.data.buf.out,
+ instr->ctx.data.len);
+ return 0;
+ case NAND_OP_WAITRDY_INSTR:
+ return mt7621_nfc_dev_ready(nfc,
+ instr->ctx.waitrdy.timeout_ms);
+ default:
+ WARN_ONCE(1, "unsupported NAND instruction type: %d\n",
+ instr->type);
+
+ return -EINVAL;
+ }
+}
+
+static int mt7621_nfc_exec_op(struct nand_chip *nand,
+ const struct nand_operation *op, bool check_only)
+{
+ struct mt7621_nfc *nfc = nand_get_controller_data(nand);
+ int i, ret;
+
+ if (check_only)
+ return 0;
+
+ /* Only CS0 available */
+ nfi_write16(nfc, NFI_CSEL, 0);
+
+ for (i = 0; i < op->ninstrs; i++) {
+ ret = mt7621_nfc_exec_instr(nand, &op->instrs[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int mt7621_nfc_setup_data_interface(struct nand_chip *nand, int csline,
+ const struct nand_data_interface *conf)
+{
+ struct mt7621_nfc *nfc = nand_get_controller_data(nand);
+ const struct nand_sdr_timings *timings;
+ u32 acccon, temp, rate, tpoecs, tprecs, tc2r, tw2r, twh, twst, trlt;
+
+ if (!nfc->nfi_clk)
+ return -ENOTSUPP;
+
+ timings = nand_get_sdr_timings(conf);
+ if (IS_ERR(timings))
+ return -ENOTSUPP;
+
+ rate = clk_get_rate(nfc->nfi_clk);
+
+ /* turn clock rate into KHZ */
+ rate /= 1000;
+
+ tpoecs = max(timings->tALH_min, timings->tCLH_min) / 1000;
+ tpoecs = DIV_ROUND_UP(tpoecs * rate, 1000000);
+ tpoecs = min_t(u32, tpoecs, ACCCON_POECS_MAX);
+
+ tprecs = max(timings->tCLS_min, timings->tALS_min) / 1000;
+ tprecs = DIV_ROUND_UP(tprecs * rate, 1000000);
+ tprecs = min_t(u32, tprecs, ACCCON_PRECS_MAX);
+
+ /* sdr interface has no tCR which means CE# low to RE# low */
+ tc2r = 0;
+
+ tw2r = timings->tWHR_min / 1000;
+ tw2r = DIV_ROUND_UP(tw2r * rate, 1000000);
+ tw2r = DIV_ROUND_UP(tw2r - 1, 2);
+ tw2r = min_t(u32, tw2r, ACCCON_W2R_MAX);
+
+ twh = max(timings->tREH_min, timings->tWH_min) / 1000;
+ twh = DIV_ROUND_UP(twh * rate, 1000000) - 1;
+ twh = min_t(u32, twh, ACCCON_WH_MAX);
+
+ /* Calculate real WE#/RE# hold time in nanosecond */
+ temp = (twh + 1) * 1000000 / rate;
+ /* nanosecond to picosecond */
+ temp *= 1000;
+
+ /*
+ * WE# low level time should be expaned to meet WE# pulse time
+ * and WE# cycle time at the same time.
+ */
+ if (temp < timings->tWC_min)
+ twst = timings->tWC_min - temp;
+ else
+ twst = 0;
+ twst = max(timings->tWP_min, twst) / 1000;
+ twst = DIV_ROUND_UP(twst * rate, 1000000) - 1;
+ twst = min_t(u32, twst, ACCCON_WST_MAX);
+
+ /*
+ * RE# low level time should be expaned to meet RE# pulse time
+ * and RE# cycle time at the same time.
+ */
+ if (temp < timings->tRC_min)
+ trlt = timings->tRC_min - temp;
+ else
+ trlt = 0;
+ trlt = max(trlt, timings->tRP_min) / 1000;
+ trlt = DIV_ROUND_UP(trlt * rate, 1000000) - 1;
+ trlt = min_t(u32, trlt, ACCCON_RLT_MAX);
+
+ if (csline == NAND_DATA_IFACE_CHECK_ONLY) {
+ if (twst < ACCCON_WST_MIN || trlt < ACCCON_RLT_MIN)
+ return -ENOTSUPP;
+ }
+
+ acccon = ACCTIMING(tpoecs, tprecs, tc2r, tw2r, twh, twst, trlt);
+
+ dev_info(nfc->dev, "Using programmed access timing: %08x\n", acccon);
+
+ nfi_write32(nfc, NFI_ACCCON, acccon);
+
+ return 0;
+}
+
+static int mt7621_nfc_calc_ecc_strength(struct mt7621_nfc *nfc,
+ u32 avail_ecc_bytes)
+{
+ struct nand_chip *nand = &nfc->nand;
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ u32 strength;
+ int i;
+
+ strength = avail_ecc_bytes * 8 / ECC_PARITY_BITS;
+
+ /* Find the closest supported ecc strength */
+ for (i = ARRAY_SIZE(mt7621_ecc_strength) - 1; i >= 0; i--) {
+ if (mt7621_ecc_strength[i] <= strength)
+ break;
+ }
+
+ if (unlikely(i < 0)) {
+ dev_err(nfc->dev, "OOB size (%u) is not supported\n",
+ mtd->oobsize);
+ return -EINVAL;
+ }
+
+ nand->ecc.strength = mt7621_ecc_strength[i];
+ nand->ecc.bytes =
+ DIV_ROUND_UP(nand->ecc.strength * ECC_PARITY_BITS, 8);
+
+ dev_info(nfc->dev, "ECC strength adjusted to %u bits\n",
+ nand->ecc.strength);
+
+ return i;
+}
+
+static int mt7621_nfc_set_spare_per_sector(struct mt7621_nfc *nfc)
+{
+ struct nand_chip *nand = &nfc->nand;
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ u32 size;
+ int i;
+
+ size = nand->ecc.bytes + NFI_FDM_SIZE;
+
+ /* Find the closest supported spare size */
+ for (i = 0; i < ARRAY_SIZE(mt7621_nfi_spare_size); i++) {
+ if (mt7621_nfi_spare_size[i] >= size)
+ break;
+ }
+
+ if (unlikely(i >= ARRAY_SIZE(mt7621_nfi_spare_size))) {
+ dev_err(nfc->dev, "OOB size (%u) is not supported\n",
+ mtd->oobsize);
+ return -EINVAL;
+ }
+
+ nfc->spare_per_sector = mt7621_nfi_spare_size[i];
+
+ return i;
+}
+
+static int mt7621_nfc_ecc_init(struct mt7621_nfc *nfc)
+{
+ struct nand_chip *nand = &nfc->nand;
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ u32 spare_per_sector, encode_block_size, decode_block_size;
+ u32 ecc_enccfg, ecc_deccfg;
+ int ecc_cap;
+
+ /* Only hardware ECC mode is supported */
+ if (nand->ecc.mode != NAND_ECC_HW_SYNDROME) {
+ dev_err(nfc->dev, "Only hardware ECC mode is supported\n");
+ return -EINVAL;
+ }
+
+ nand->ecc.size = ECC_SECTOR_SIZE;
+ nand->ecc.steps = mtd->writesize / nand->ecc.size;
+
+ spare_per_sector = mtd->oobsize / nand->ecc.steps;
+
+ ecc_cap = mt7621_nfc_calc_ecc_strength(nfc,
+ spare_per_sector - NFI_FDM_SIZE);
+ if (ecc_cap < 0)
+ return ecc_cap;
+
+ /* Sector + FDM */
+ encode_block_size = (nand->ecc.size + NFI_FDM_SIZE) * 8;
+ ecc_enccfg = ecc_cap | (ENC_MODE_NFI << ENC_MODE_S) |
+ (encode_block_size << ENC_CNFG_MSG_S);
+
+ /* Sector + FDM + ECC parity bits */
+ decode_block_size = ((nand->ecc.size + NFI_FDM_SIZE) * 8) +
+ nand->ecc.strength * ECC_PARITY_BITS;
+ ecc_deccfg = ecc_cap | (DEC_MODE_NFI << DEC_MODE_S) |
+ (decode_block_size << DEC_CS_S) |
+ (DEC_CON_EL << DEC_CON_S) | DEC_EMPTY_EN;
+
+ mt7621_ecc_encoder_op(nfc, false);
+ ecc_write32(nfc, ECC_ENCCNFG, ecc_enccfg);
+
+ mt7621_ecc_decoder_op(nfc, false);
+ ecc_write32(nfc, ECC_DECCNFG, ecc_deccfg);
+
+ return 0;
+}
+
+static int mt7621_nfc_set_page_format(struct mt7621_nfc *nfc)
+{
+ struct nand_chip *nand = &nfc->nand;
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ int i, spare_size;
+ u32 pagefmt;
+
+ spare_size = mt7621_nfc_set_spare_per_sector(nfc);
+ if (spare_size < 0)
+ return spare_size;
+
+ for (i = 0; i < ARRAY_SIZE(mt7621_nfi_page_size); i++) {
+ if (mt7621_nfi_page_size[i] == mtd->writesize)
+ break;
+ }
+
+ if (unlikely(i >= ARRAY_SIZE(mt7621_nfi_page_size))) {
+ dev_err(nfc->dev, "Page size (%u) is not supported\n",
+ mtd->writesize);
+ return -EINVAL;
+ }
+
+ pagefmt = i | (spare_size << PAGEFMT_SPARE_S) |
+ (NFI_FDM_SIZE << PAGEFMT_FDM_S) |
+ (NFI_FDM_SIZE << PAGEFMT_FDM_ECC_S);
+
+ nfi_write16(nfc, NFI_PAGEFMT, pagefmt);
+
+ return 0;
+}
+
+static int mt7621_nfc_attach_chip(struct nand_chip *nand)
+{
+ struct mt7621_nfc *nfc = nand_get_controller_data(nand);
+ int ret;
+
+ if (nand->options & NAND_BUSWIDTH_16) {
+ dev_err(nfc->dev, "16-bit buswidth is not supported");
+ return -EINVAL;
+ }
+
+ ret = mt7621_nfc_ecc_init(nfc);
+ if (ret)
+ return ret;
+
+ return mt7621_nfc_set_page_format(nfc);
+}
+
+static const struct nand_controller_ops mt7621_nfc_controller_ops = {
+ .attach_chip = mt7621_nfc_attach_chip,
+ .exec_op = mt7621_nfc_exec_op,
+ .setup_data_interface = mt7621_nfc_setup_data_interface,
+};
+
+static int mt7621_nfc_ooblayout_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oob_region)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+
+ if (section >= nand->ecc.steps)
+ return -ERANGE;
+
+ oob_region->length = NFI_FDM_SIZE - 1;
+ oob_region->offset = section * NFI_FDM_SIZE + 1;
+
+ return 0;
+}
+
+static int mt7621_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oob_region)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+
+ if (section)
+ return -ERANGE;
+
+ oob_region->offset = NFI_FDM_SIZE * nand->ecc.steps;
+ oob_region->length = mtd->oobsize - oob_region->offset;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops mt7621_nfc_ooblayout_ops = {
+ .free = mt7621_nfc_ooblayout_free,
+ .ecc = mt7621_nfc_ooblayout_ecc,
+};
+
+static void mt7621_nfc_write_fdm(struct mt7621_nfc *nfc)
+{
+ struct nand_chip *nand = &nfc->nand;
+ u32 vall, valm;
+ u8 *oobptr;
+ int i, j;
+
+ for (i = 0; i < nand->ecc.steps; i++) {
+ vall = 0;
+ valm = 0;
+ oobptr = oob_fdm_ptr(nand, i);
+
+ for (j = 0; j < 4; j++)
+ vall |= (u32)oobptr[j] << (j * 8);
+
+ for (j = 0; j < 4; j++)
+ valm |= (u32)oobptr[j + 4] << ((j - 4) * 8);
+
+ nfi_write32(nfc, NFI_FDML(i), vall);
+ nfi_write32(nfc, NFI_FDMM(i), valm);
+ }
+}
+
+static void mt7621_nfc_read_sector_fdm(struct mt7621_nfc *nfc, u32 sect)
+{
+ struct nand_chip *nand = &nfc->nand;
+ u32 vall, valm;
+ u8 *oobptr;
+ int i;
+
+ vall = nfi_read32(nfc, NFI_FDML(sect));
+ valm = nfi_read32(nfc, NFI_FDMM(sect));
+ oobptr = oob_fdm_ptr(nand, sect);
+
+ for (i = 0; i < 4; i++)
+ oobptr[i] = (vall >> (i * 8)) & 0xff;
+
+ for (i = 0; i < 4; i++)
+ oobptr[i + 4] = (valm >> (i * 8)) & 0xff;
+}
+
+static int mt7621_nfc_read_page_hwecc(struct nand_chip *nand, uint8_t *buf,
+ int oob_required, int page)
+{
+ struct mt7621_nfc *nfc = nand_get_controller_data(nand);
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ int bitflips = 0;
+ int rc, i;
+
+ nand_read_page_op(nand, page, 0, NULL, 0);
+
+ nfi_write16(nfc, NFI_CNFG, (CNFG_OP_CUSTOM << CNFG_OP_MODE_S) |
+ CNFG_READ_MODE | CNFG_AUTO_FMT_EN | CNFG_HW_ECC_EN);
+
+ mt7621_ecc_decoder_op(nfc, true);
+
+ nfi_write16(nfc, NFI_CON,
+ CON_NFI_BRD | (nand->ecc.steps << CON_NFI_SEC_S));
+
+ for (i = 0; i < nand->ecc.steps; i++) {
+ if (buf)
+ mt7621_nfc_read_data(nfc, page_data_ptr(nand, buf, i),
+ nand->ecc.size);
+ else
+ mt7621_nfc_read_data_discard(nfc, nand->ecc.size);
+
+ rc = mt7621_ecc_decoder_wait_done(nfc, i);
+
+ mt7621_nfc_read_sector_fdm(nfc, i);
+
+ if (rc < 0) {
+ bitflips = -EIO;
+ continue;
+ }
+
+ rc = mt7621_ecc_correct_check(nfc,
+ buf ? page_data_ptr(nand, buf, i) : NULL,
+ oob_fdm_ptr(nand, i), i);
+
+ if (rc < 0) {
+ dev_warn(nfc->dev,
+ "Uncorrectable ECC error at page %d.%d\n",
+ page, i);
+ bitflips = -EBADMSG;
+ mtd->ecc_stats.failed++;
+ } else if (bitflips >= 0) {
+ bitflips += rc;
+ mtd->ecc_stats.corrected += rc;
+ }
+ }
+
+ mt7621_ecc_decoder_op(nfc, false);
+
+ nfi_write16(nfc, NFI_CON, 0);
+
+ return bitflips;
+}
+
+static int mt7621_nfc_read_page_raw(struct nand_chip *nand, uint8_t *buf,
+ int oob_required, int page)
+{
+ struct mt7621_nfc *nfc = nand_get_controller_data(nand);
+ int i;
+
+ nand_read_page_op(nand, page, 0, NULL, 0);
+
+ nfi_write16(nfc, NFI_CNFG, (CNFG_OP_CUSTOM << CNFG_OP_MODE_S) |
+ CNFG_READ_MODE);
+
+ nfi_write16(nfc, NFI_CON,
+ CON_NFI_BRD | (nand->ecc.steps << CON_NFI_SEC_S));
+
+ for (i = 0; i < nand->ecc.steps; i++) {
+ /* Read data */
+ if (buf)
+ mt7621_nfc_read_data(nfc, page_data_ptr(nand, buf, i),
+ nand->ecc.size);
+ else
+ mt7621_nfc_read_data_discard(nfc, nand->ecc.size);
+
+ /* Read FDM */
+ mt7621_nfc_read_data(nfc, oob_fdm_ptr(nand, i), NFI_FDM_SIZE);
+
+ /* Read ECC parity data */
+ mt7621_nfc_read_data(nfc, oob_ecc_ptr(nfc, i),
+ nfc->spare_per_sector - NFI_FDM_SIZE);
+ }
+
+ nfi_write16(nfc, NFI_CON, 0);
+
+ return 0;
+}
+
+static int mt7621_nfc_read_oob_hwecc(struct nand_chip *nand, int page)
+{
+ return mt7621_nfc_read_page_hwecc(nand, NULL, 1, page);
+}
+
+static int mt7621_nfc_read_oob_raw(struct nand_chip *nand, int page)
+{
+ return mt7621_nfc_read_page_raw(nand, NULL, 1, page);
+}
+
+static int mt7621_nfc_check_empty_page(struct nand_chip *nand, const u8 *buf)
+{
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ uint32_t i, j;
+ u8 *oobptr;
+
+ if (buf) {
+ for (i = 0; i < mtd->writesize; i++)
+ if (buf[i] != 0xff)
+ return 0;
+ }
+
+ for (i = 0; i < nand->ecc.steps; i++) {
+ oobptr = oob_fdm_ptr(nand, i);
+ for (j = 0; j < NFI_FDM_SIZE; j++)
+ if (oobptr[j] != 0xff)
+ return 0;
+ }
+
+ return 1;
+}
+
+static int mt7621_nfc_write_page_hwecc(struct nand_chip *nand,
+ const uint8_t *buf, int oob_required,
+ int page)
+{
+ struct mt7621_nfc *nfc = nand_get_controller_data(nand);
+ struct mtd_info *mtd = nand_to_mtd(nand);
+
+ if (mt7621_nfc_check_empty_page(nand, buf)) {
+ /*
+ * MT7621 ECC engine always generates parity code for input
+ * pages, even for empty pages. Doing so will write back ECC
+ * parity code to the oob region, which means such pages will
+ * no longer be empty pages.
+ *
+ * To avoid this, stop write operation if current page is an
+ * empty page.
+ */
+ return 0;
+ }
+
+ nand_prog_page_begin_op(nand, page, 0, NULL, 0);
+
+ nfi_write16(nfc, NFI_CNFG, (CNFG_OP_CUSTOM << CNFG_OP_MODE_S) |
+ CNFG_AUTO_FMT_EN | CNFG_HW_ECC_EN);
+
+ mt7621_ecc_encoder_op(nfc, true);
+
+ mt7621_nfc_write_fdm(nfc);
+
+ nfi_write16(nfc, NFI_CON,
+ CON_NFI_BWR | (nand->ecc.steps << CON_NFI_SEC_S));
+
+ if (buf)
+ mt7621_nfc_write_data(nfc, buf, mtd->writesize);
+ else
+ mt7621_nfc_write_data_empty(nfc, mtd->writesize);
+
+ mt7621_nfc_wait_write_completion(nfc, nand);
+
+ mt7621_ecc_encoder_op(nfc, false);
+
+ nfi_write16(nfc, NFI_CON, 0);
+
+ return nand_prog_page_end_op(nand);
+}
+
+static int mt7621_nfc_write_page_raw(struct nand_chip *nand,
+ const uint8_t *buf, int oob_required,
+ int page)
+{
+ struct mt7621_nfc *nfc = nand_get_controller_data(nand);
+ int i;
+
+ nand_prog_page_begin_op(nand, page, 0, NULL, 0);
+
+ nfi_write16(nfc, NFI_CNFG, (CNFG_OP_CUSTOM << CNFG_OP_MODE_S));
+
+ nfi_write16(nfc, NFI_CON,
+ CON_NFI_BWR | (nand->ecc.steps << CON_NFI_SEC_S));
+
+ for (i = 0; i < nand->ecc.steps; i++) {
+ /* Write data */
+ if (buf)
+ mt7621_nfc_write_data(nfc, page_data_ptr(nand, buf, i),
+ nand->ecc.size);
+ else
+ mt7621_nfc_write_data_empty(nfc, nand->ecc.size);
+
+ /* Write FDM */
+ mt7621_nfc_write_data(nfc, oob_fdm_ptr(nand, i),
+ NFI_FDM_SIZE);
+
+ /* Write dummy ECC parity data */
+ mt7621_nfc_write_data_empty(nfc, nfc->spare_per_sector -
+ NFI_FDM_SIZE);
+ }
+
+ mt7621_nfc_wait_write_completion(nfc, nand);
+
+ nfi_write16(nfc, NFI_CON, 0);
+
+ return nand_prog_page_end_op(nand);
+}
+
+static int mt7621_nfc_write_oob_hwecc(struct nand_chip *nand, int page)
+{
+ return mt7621_nfc_write_page_hwecc(nand, NULL, 1, page);
+}
+
+static int mt7621_nfc_write_oob_raw(struct nand_chip *nand, int page)
+{
+ return mt7621_nfc_write_page_raw(nand, NULL, 1, page);
+}
+
+static int mt7621_nfc_init_chip(struct mt7621_nfc *nfc)
+{
+ struct nand_chip *nand = &nfc->nand;
+ struct mtd_info *mtd;
+ int ret;
+
+ nand->controller = &nfc->controller;
+ nand_set_controller_data(nand, (void *)nfc);
+ nand_set_flash_node(nand, nfc->dev->of_node);
+
+ nand->options |= NAND_USE_BOUNCE_BUFFER | NAND_NO_SUBPAGE_WRITE;
+ if (!nfc->nfi_clk)
+ nand->options |= NAND_KEEP_TIMINGS;
+
+ nand->ecc.mode = NAND_ECC_HW_SYNDROME;
+ nand->ecc.read_page = mt7621_nfc_read_page_hwecc;
+ nand->ecc.read_page_raw = mt7621_nfc_read_page_raw;
+ nand->ecc.write_page = mt7621_nfc_write_page_hwecc;
+ nand->ecc.write_page_raw = mt7621_nfc_write_page_raw;
+ nand->ecc.read_oob = mt7621_nfc_read_oob_hwecc;
+ nand->ecc.read_oob_raw = mt7621_nfc_read_oob_raw;
+ nand->ecc.write_oob = mt7621_nfc_write_oob_hwecc;
+ nand->ecc.write_oob_raw = mt7621_nfc_write_oob_raw;
+
+ mtd = nand_to_mtd(nand);
+ mtd->owner = THIS_MODULE;
+ mtd->dev.parent = nfc->dev;
+ mtd->name = MT7621_NFC_NAME;
+ mtd_set_ooblayout(mtd, &mt7621_nfc_ooblayout_ops);
+
+ mt7621_nfc_hw_init(nfc);
+
+ ret = nand_scan(nand, 1);
+ if (ret)
+ return ret;
+
+ ret = mtd_device_register(mtd, NULL, 0);
+ if (ret) {
+ dev_err(nfc->dev, "Failed to register MTD: %d\n", ret);
+ nand_release(nand);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int mt7621_nfc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mt7621_nfc *nfc;
+ struct resource *res;
+ int ret;
+
+ nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL);
+ if (!nfc)
+ return -ENOMEM;
+
+ nand_controller_init(&nfc->controller);
+ nfc->controller.ops = &mt7621_nfc_controller_ops;
+ nfc->dev = dev;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nfi");
+ nfc->nfi_regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(nfc->nfi_regs)) {
+ ret = PTR_ERR(nfc->nfi_regs);
+ return ret;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ecc");
+ nfc->ecc_regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(nfc->ecc_regs)) {
+ ret = PTR_ERR(nfc->ecc_regs);
+ return ret;
+ }
+
+ nfc->nfi_clk = devm_clk_get(dev, "nfi_clk");
+ if (IS_ERR(nfc->nfi_clk)) {
+ dev_warn(dev, "nfi clk not provided\n");
+ nfc->nfi_clk = NULL;
+ } else {
+ ret = clk_prepare_enable(nfc->nfi_clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable nfi core clock\n");
+ return ret;
+ }
+ }
+
+ platform_set_drvdata(pdev, nfc);
+
+ ret = mt7621_nfc_init_chip(nfc);
+ if (ret) {
+ dev_err(dev, "Failed to initialize nand chip\n");
+ goto clk_disable;
+ }
+
+ return 0;
+
+clk_disable:
+ clk_disable_unprepare(nfc->nfi_clk);
+
+ return ret;
+}
+
+static int mt7621_nfc_remove(struct platform_device *pdev)
+{
+ struct mt7621_nfc *nfc = platform_get_drvdata(pdev);
+
+ nand_release(&nfc->nand);
+ clk_disable_unprepare(nfc->nfi_clk);
+
+ return 0;
+}
+
+static const struct of_device_id mt7621_nfc_id_table[] = {
+ { .compatible = "mediatek,mt7621-nfc" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, match);
+
+static struct platform_driver mt7621_nfc_driver = {
+ .probe = mt7621_nfc_probe,
+ .remove = mt7621_nfc_remove,
+ .driver = {
+ .name = MT7621_NFC_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = mt7621_nfc_id_table,
+ },
+};
+module_platform_driver(mt7621_nfc_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Weijie Gao <weijie.gao@mediatek.com>");
+MODULE_DESCRIPTION("MediaTek MT7621 NAND Flash Controller driver");
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