This driver supports Rockchip NFC (NAND Flash Controller) found on RK3308,
RK3368, RKPX30, RV1108 and other SOCs. The driver has been tested using
8-bit NAND interface on the ARM based RK3308 platform.
Support Rockchip NFC versions:
- V6: ECC 16, 24, 40 and 60 bits per 1KB data. Found on RK3066, RK3368,
RK3229, RK3188, RK3288, RK3128, RKPX3SE, RKPx3, RKPX5, RK3036 and
RK3126.
- V8: ECC 16 bits per 1KB data. Found on RV1108/7, RK3308.
- V9: ECC 16, 40, 60 and 70 bits per 1KB data. Found on RK3326, RKPX30.
Support feature:
- Read full page data by DMA.
- Support HW ECC(one step is 1KB).
- Support 2 - 32K page size.
- Support 4 CS(depend on Soc)
Limitations:
- Unsupport 512B ecc step.
- Raw page read and write without ecc redundancy code. So could not support
raw data dump and restore.
- Untested on some SOCs.
- Unsupport subpage.
- Unsupport randomizer.
- The original bad block mask is not supported. It is recommended to use
the BBT(bad block table).
Signed-off-by: Yifeng Zhao <yifeng.zhao@xxxxxxxxxxxxxx>
---
Changes in v2:
- Fix compile error.
- Include files sorted by file name
drivers/mtd/nand/raw/Kconfig | 7 +
drivers/mtd/nand/raw/Makefile | 1 +
drivers/mtd/nand/raw/rockchip_nand.c | 1229 ++++++++++++++++++++++++++
3 files changed, 1237 insertions(+)
create mode 100644 drivers/mtd/nand/raw/rockchip_nand.c
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index a80a46bb5b8b..8313b12a9d85 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -433,6 +433,13 @@ config MTD_NAND_MESON
Enables support for NAND controller on Amlogic's Meson SoCs.
This controller is found on Meson SoCs.
+config MTD_NAND_ROCKCHIP
+ tristate "Rockchip NAND controller"
+ depends on ARCH_ROCKCHIP || COMPILE_TEST
+ depends on HAS_IOMEM
+ help
+ Enables support for NAND controller on Rockchip SoCs.
+
config MTD_NAND_GPIO
tristate "GPIO assisted NAND controller"
depends on GPIOLIB || COMPILE_TEST
diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
index 2d136b158fb7..8bafa59b8940 100644
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_MTD_NAND_TEGRA) += tegra_nand.o
obj-$(CONFIG_MTD_NAND_STM32_FMC2) += stm32_fmc2_nand.o
obj-$(CONFIG_MTD_NAND_MESON) += meson_nand.o
obj-$(CONFIG_MTD_NAND_CADENCE) += cadence-nand-controller.o
+obj-$(CONFIG_MTD_NAND_ROCKCHIP) += rockchip_nand.o
nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o
nand-objs += nand_onfi.o
diff --git a/drivers/mtd/nand/raw/rockchip_nand.c b/drivers/mtd/nand/raw/rockchip_nand.c
new file mode 100644
index 000000000000..efeda609fbf2
--- /dev/null
+++ b/drivers/mtd/nand/raw/rockchip_nand.c
@@ -0,0 +1,1229 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/*
+ * Rockchip NAND Flash controller driver.
+ * Copyright (C) 2020 Rockchip Inc.
+ * Authors: Yifeng Zhao <yifeng.zhao@xxxxxxxxxxxxxx>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/interrupt.h>
+#include <linux/iopoll.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+/*
+ * NFC Page Data Layout:
+ * 1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
+ * 1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc +
+ * ......
+ * NAND Page Data Layout:
+ * 1024 * n Data + m Bytes oob
+ * Original Bad Block Mask Location:
+ * first byte of oob(spare)
+ * nand_chip->oob_poi data layout:
+ * 4Bytes sys data + .... + 4Bytes sys data + ecc data
+ */
+
+/* NAND controller register definition */
+#define NFC_VERSION_9 0x56393030
+#define NFC_READ (0)
+#define NFC_WRITE (1)
+#define NFC_FMCTL (0x00)
+#define FMCTL_CE_SEL_M 0xFF
+#define FMCTL_CE_SEL(x) (1 << (x))
+#define FMCTL_WP BIT(8)
+#define FMCTL_RDY BIT(9)
+#define NFC_FMWAIT (0x04)
+#define NFC_FLCTL_V6 (0x08)
+#define NFC_FLCTL_V9 (0x10)
+#define FLCTL_RST BIT(0)
+#define FLCTL_WR (1) /* 0: read, 1: write */
+#define FLCTL_XFER_ST BIT(2)
+#define FLCTL_XFER_EN BIT(3)
+#define FLCTL_ACORRECT BIT(10) /* auto correct error bits */
+#define FLCTL_XFER_READY BIT(20)
+#define FLCTL_XFER_SECTOR (22)
+#define FLCTL_TOG_FIX BIT(29)
+#define NFC_BCHCTL_V6 (0x0C)
+#define BCHCTL_BANK_M (7 << 5)
+#define BCHCTL_BANK (5)
+#define NFC_BCHCTL_V9 (0x20)
+#define NFC_DMA_CFG_V6 (0x10)
+#define NFC_DMA_CFG_V9 (0x30)
+#define DMA_ST BIT(0)
+#define DMA_WR (1) /* 0: write, 1: read */
+#define DMA_EN BIT(2)
+#define DMA_AHB_SIZE (3) /* 0: 1, 1: 2, 2: 4 */
+#define DMA_BURST_SIZE (6) /* 0: 1, 3: 4, 5: 8, 7: 16 */
+#define DMA_INC_NUM (9) /* 1 - 16 */
+#define NFC_DMA_DATA_BUF_V6 (0x14)
+#define NFC_DMA_DATA_BUF_V9 (0x34)
+#define NFC_DMA_OOB_BUF_V6 (0x18)
+#define NFC_DMA_OOB_BUF_V9 (0x38)
+#define NFC_DMA_ST_V6 (0x1C)
+#define NFC_DMA_ST_V9 (0x3C)
+#define NFC_BCH_ST_V6 (0x20)
+#define NFC_BCH_ST_V9 (0x150)
+#define BCH_ST_ERR0_V6 BIT(2)
+#define BCH_ST_ERR1_V6 BIT(15)
+#define BCH_ST_ERR0_V9 BIT(2)
+#define BCH_ST_ERR1_V9 BIT(18)
+#define ECC_ERR_CNT0_V6(x) (((((x) & (0x1F << 3)) >> 3) \
+ | (((x) & (1 << 27)) >> 22)) & 0x3F)
+#define ECC_ERR_CNT1_V6(x) (((((x) & (0x1F << 16)) >> 16) \
+ | (((x) & (1 << 29)) >> 24)) & 0x3F)
+#define ECC_ERR_CNT0_V9(x) (((x) & (0x7F << 3)) >> 3)
+#define ECC_ERR_CNT1_V9(x) (((x) & (0x7F << 19)) >> 19)
+#define NFC_RANDMZ_V6 (0x150)
+#define NFC_RANDMZ_V9 (0x208)
+#define NFC_VER_V6 (0x160)
+#define NFC_VER_V9 (0x80)
+#define NFC_INTEN_V6 (0x16C)
+#define NFC_INTEN_V9 (0x120)
+#define NFC_INTCLR_V6 (0x170)
+#define NFC_INTCLR_V9 (0x124)
+#define NFC_INTST_V6 (0x174)
+#define NFC_INTST_V9 (0x128)
+#define INT_DMA BIT(0)
+#define NFC_OOB0_V6 (0x200)
+#define NFC_OOB0_V9 (0x200)
+#define NFC_OOB1_V6 (0x230)
+#define NFC_OOB1_V9 (0x204)
+#define NFC_BANK (0x800)
+#define BANK_DATA (0x00)
+#define BANK_ADDR (0x04)
+#define BANK_CMD (0x08)
+#define NFC_SRAM0 (0x1000)
+#define NFC_SRAM1 (0x1400)
+
+#define THIS_NAME "rk-nand"
+
+#define RK_TIMEOUT (500000)
+#define RK_NAND_MAX_NSELS (4) /* Some Soc only has 1 or 2 CSs */
+#define NFC_SYS_DATA_SIZE (4) /* 4 bytes sys data in oob pre 1024 data */
+#define RK_DEFAULT_CLOCK_RATE (150 * 1000 * 1000) /* 150 Mhz*/
+#define ACCTIMING(csrw, rwpw, rwcs) ((csrw) << 12 | (rwpw) << 5 | (rwcs))
+
+struct rk_nfc_nand_chip {
+ struct list_head node;
+ struct nand_chip nand;
+
+ u32 spare_per_sector;
+ u32 oob_buf_per_sector;
+
+ int nsels;
+ u8 sels[0];
+ /* nothing after this field */
+};
+
+struct rk_nfc_clk {
+ int nfc_rate;
+ struct clk *nfc_clk;
+ struct clk *ahb_clk;
+};
+
+struct rk_nfc {
+ struct nand_controller controller;
+ struct rk_nfc_clk clk;
+
+ struct device *dev;
+ void __iomem *regs;
+ int nfc_version;
+ int max_ecc_strength;
+ int selected_bank;
+ int band_offset;
+
+ struct completion done;
+ struct list_head chips;
+
+ u8 *buffer;
+ u8 *page_buf;
+ u32 *oob_buf;
+
+ unsigned long assigned_cs;
+};
+
+static inline struct rk_nfc_nand_chip *to_rk_nand(struct nand_chip *nand)
+{
+ return container_of(nand, struct rk_nfc_nand_chip, nand);
+}
+
+static inline u8 *data_ptr(struct nand_chip *chip, const u8 *p, int i)
+{
+ return (u8 *)p + i * chip->ecc.size;
+}
+
+static inline u8 *oob_ptr(struct nand_chip *chip, int i)
+{
+ u8 *poi;
+
+ poi = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
+
+ return poi;
+}
+
+static inline int rk_data_len(struct nand_chip *chip)
+{
+ struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
+
+ return chip->ecc.size + rk_nand->spare_per_sector;
+}
+
+static inline u8 *rk_data_ptr(struct nand_chip *chip, int i)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+
+ return nfc->buffer + i * rk_data_len(chip);
+}
+
+static inline u8 *rk_oob_ptr(struct nand_chip *chip, int i)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+
+ return nfc->buffer + i * rk_data_len(chip) + chip->ecc.size;
+}
+
+static inline void nfc_writel(struct rk_nfc *nfc, u32 val, u32 reg)
+{
+ writel(val, nfc->regs + reg);
+}
+
+static inline void nfc_writew(struct rk_nfc *nfc, u16 val, u32 reg)
+{
+ writew(val, nfc->regs + reg);
+}
+
+static inline void nfc_writeb(struct rk_nfc *nfc, u8 val, u32 reg)
+{
+ writeb(val, nfc->regs + reg);
+}
+
+static inline u32 nfc_readl(struct rk_nfc *nfc, u32 reg)
+{
+ return readl_relaxed(nfc->regs + reg);
+}
+
+static inline u16 nfc_readw(struct rk_nfc *nfc, u32 reg)
+{
+ return readw_relaxed(nfc->regs + reg);
+}
+
+static inline u8 nfc_readb(struct rk_nfc *nfc, u32 reg)
+{
+ return readb_relaxed(nfc->regs + reg);
+}
+
+static void rk_nfc_select_chip(struct nand_chip *nand, int chip)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(nand);
+ struct rk_nfc_nand_chip *rk_nand = to_rk_nand(nand);
+ u32 val;
+
+ if (chip < 0) {
+ nfc->selected_bank = -1;
+ return;
+ }
+
+ nfc->selected_bank = rk_nand->sels[chip];
+ nfc->band_offset = NFC_BANK + nfc->selected_bank * 0x100;
+
+ val = nfc_readl(nfc, NFC_FMCTL);
+ val &= ~FMCTL_CE_SEL_M;
+ val |= FMCTL_CE_SEL(nfc->selected_bank);
+
+ nfc_writel(nfc, val, NFC_FMCTL);
+}
+
+static int rk_nfc_dev_ready(struct nand_chip *nand)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(nand);
+
+ if (nfc_readl(nfc, NFC_FMCTL) & FMCTL_RDY)
+ return 1;
+
+ return 0;
+}
+
+static void rk_nfc_cmd_ctrl(struct nand_chip *chip, int dat,
+ unsigned int ctrl)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+ int reg_offset = nfc->band_offset;
+
+ if (ctrl & NAND_ALE)
+ reg_offset += BANK_ADDR;
+ else if (ctrl & NAND_CLE)
+ reg_offset += BANK_CMD;
+
+ if (dat != NAND_CMD_NONE)
+ nfc_writeb(nfc, dat & 0xFF, reg_offset);
+}
+
+static inline void rk_nfc_wait_ioready(struct rk_nfc *nfc)
+{
+ int rc;
+ u32 val;
+
+ rc = readl_poll_timeout_atomic(nfc->regs + NFC_FMCTL, val,
+ val & FMCTL_RDY, 10, RK_TIMEOUT);
+ if (rc < 0)
+ dev_err(nfc->dev, "data not ready\n");
+}
+
+static inline u8 rk_nfc_read_byte(struct nand_chip *chip)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+
+ return nfc_readb(nfc, nfc->band_offset + BANK_DATA);
+}
+
+static void rk_nfc_read_buf(struct nand_chip *chip, u8 *buf, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ buf[i] = rk_nfc_read_byte(chip);
+}
+
+static void rk_nfc_write_byte(struct nand_chip *chip, u8 byte)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+
+ nfc_writeb(nfc, byte, nfc->band_offset + BANK_DATA);
+}
+
+static void rk_nfc_write_buf(struct nand_chip *chip, const u8 *buf, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ rk_nfc_write_byte(chip, buf[i]);
+}
+
+static int rk_nfc_setup_data_interface(struct nand_chip *chip, int csline,
+ const struct nand_data_interface *conf)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+ const struct nand_sdr_timings *timings;
+ u32 rate, tc2rw, trwpw, trw2c;
+ u32 temp;
+
+ if (csline == NAND_DATA_IFACE_CHECK_ONLY)
+ return 0;
+
+ /* not onfi nand flash */
+ if (!chip->parameters.onfi)
+ return 0;
+
+ timings = nand_get_sdr_timings(conf);
+ if (IS_ERR(timings))
+ return -ENOTSUPP;
+
+ rate = clk_get_rate(nfc->clk.nfc_clk);
+
+ /* turn clock rate into KHZ */
+ rate /= 1000;
+
+ tc2rw = trw2c = 1;
+
+ trwpw = max(timings->tWC_min, timings->tRC_min) / 1000;
+ trwpw = DIV_ROUND_UP(trwpw * rate, 1000000);
+
+ temp = timings->tREA_max / 1000;
+ temp = DIV_ROUND_UP(temp * rate, 1000000);
+
+ if (trwpw < temp)
+ trwpw = temp;
+
+ if (trwpw > 6) {
+ tc2rw++;
+ trw2c++;
+ trwpw -= 2;
+ }
+
+ /*
+ * ACCON: access timing control register
+ * -------------------------------------
+ * 31:18: reserved
+ * 17:12: csrw, clock cycles from the falling edge of CSn to the
+ falling edge of RDn or WRn
+ * 11:11: reserved
+ * 10:05: rwpw, the width of RDn or WRn in processor clock cycles
+ * 04:00: rwcs, clock cycles from the rising edge of RDn or WRn to the
+ rising edge of CSn
+ */
+ temp = ACCTIMING(tc2rw, trwpw, trw2c);
+ nfc_writel(nfc, temp, NFC_FMWAIT);
+
+ return 0;
+}
+
+static void rk_nfc_format_page(struct mtd_info *mtd, const u8 *buf)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+ u32 i;
+
+ memset(nfc->buffer, 0xff, mtd->writesize + mtd->oobsize);
+ swap(chip->oob_poi[0], chip->oob_poi[7]);
+ for (i = 0; i < chip->ecc.steps; i++) {
+ if (buf)
+ memcpy(rk_data_ptr(chip, i), data_ptr(chip, buf, i),
+ chip->ecc.size);
+
+ memcpy(rk_oob_ptr(chip, i), oob_ptr(chip, i),
+ NFC_SYS_DATA_SIZE);
+ }
+}
+
+static void rk_nfc_xfer_start(struct rk_nfc *nfc, u8 rw, u8 n_KB,
+ dma_addr_t dma_data, dma_addr_t dma_oob)
+{
+ u32 dma_reg, fl_reg, bch_reg;
+
+ dma_reg = DMA_ST | ((!rw) << DMA_WR) | DMA_EN | (2 << DMA_AHB_SIZE) |
+ (7 << DMA_BURST_SIZE) | (16 << DMA_INC_NUM);
+
+ fl_reg = (rw << FLCTL_WR) | FLCTL_XFER_EN | FLCTL_ACORRECT |
+ (n_KB << FLCTL_XFER_SECTOR) | FLCTL_TOG_FIX;
+
+ if (nfc->nfc_version == 6) {
+ bch_reg = nfc_readl(nfc, NFC_BCHCTL_V6);
+ bch_reg = (bch_reg & (~BCHCTL_BANK_M)) |
+ (nfc->selected_bank << BCHCTL_BANK);
+ nfc_writel(nfc, bch_reg, NFC_BCHCTL_V6);
+
+ nfc_writel(nfc, dma_reg, NFC_DMA_CFG_V6);
+ nfc_writel(nfc, (u32)dma_data, NFC_DMA_DATA_BUF_V6);
+ nfc_writel(nfc, (u32)dma_oob, NFC_DMA_OOB_BUF_V6);
+ nfc_writel(nfc, fl_reg, NFC_FLCTL_V6);
+ fl_reg |= FLCTL_XFER_ST;
+ nfc_writel(nfc, fl_reg, NFC_FLCTL_V6);
+ } else {
+ nfc_writel(nfc, dma_reg, NFC_DMA_CFG_V9);
+ nfc_writel(nfc, (u32)dma_data, NFC_DMA_DATA_BUF_V9);
+ nfc_writel(nfc, (u32)dma_oob, NFC_DMA_OOB_BUF_V9);
+ nfc_writel(nfc, fl_reg, NFC_FLCTL_V9);
+ fl_reg |= FLCTL_XFER_ST;
+ nfc_writel(nfc, fl_reg, NFC_FLCTL_V9);
+ }
+}
+
+static int rk_nfc_wait_for_xfer_done(struct rk_nfc *nfc)
+{
+ u32 reg;
+ int ret = 0;
+ void __iomem *ptr;
+
+ if (nfc->nfc_version == 6)
+ ptr = nfc->regs + NFC_FLCTL_V6;
+ else
+ ptr = nfc->regs + NFC_FLCTL_V9;
+
+ ret = readl_poll_timeout_atomic(ptr, reg,
+ reg & FLCTL_XFER_READY,
+ 10, RK_TIMEOUT);
+ if (ret)
+ dev_err(nfc->dev, "timeout reg=%x\n", reg);
+
+ return ret;
+}
+
+static int rk_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
+ const u8 *buf, int page, int raw)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+ struct nand_ecc_ctrl *ecc = &chip->ecc;
+ u8 *oob;
+ dma_addr_t dma_data, dma_oob;
+ int oob_step = (ecc->bytes > 60) ? 128 : 64;
+ int pages_per_blk = mtd->erasesize / mtd->writesize;
+ u32 reg;
+ int ret = 0, i;
+
+ nand_prog_page_begin_op(chip, page, 0, NULL, 0);
+
+ if (!raw) {
+ memcpy(nfc->page_buf, buf, mtd->writesize);
+ memset(nfc->oob_buf, 0xff, oob_step * ecc->steps);
+ /*
+ * The first 8 blocks is stored loader, the first
+ * 32 bits of oob need link to next page address
+ * in the same block for Bootrom.
+ * Swap the first oob with the seventh oob,
+ * and bad block mask save at seventh oob.
+ */
+ swap(chip->oob_poi[0], chip->oob_poi[7]);
+ for (i = 0; i < ecc->steps; i++) {
+ oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
+ reg = (oob[2] << 16) | (oob[3] << 24);
+ if (!i && page < pages_per_blk * 8)
+ reg |= (page & (pages_per_blk - 1)) * 4;
+ else
+ reg |= oob[0] | (oob[1] << 8);
+
+ if (nfc->nfc_version == 6)
+ nfc->oob_buf[i * oob_step / 4] = reg;
+ else
+ nfc->oob_buf[i] = reg;
+ }
+
+ dma_data = dma_map_single(nfc->dev, (void *)nfc->page_buf,
+ mtd->writesize, DMA_TO_DEVICE);
+ dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
+ ecc->steps * oob_step,
+ DMA_TO_DEVICE);
+
+ init_completion(&nfc->done);
+ if (nfc->nfc_version == 6)
+ nfc_writel(nfc, INT_DMA, NFC_INTEN_V6);
+ else
+ nfc_writel(nfc, INT_DMA, NFC_INTEN_V9);
+
+ rk_nfc_xfer_start(nfc, NFC_WRITE, ecc->steps, dma_data,
+ dma_oob);
+ ret = wait_for_completion_timeout(&nfc->done,
+ msecs_to_jiffies(100));
+ if (!ret)
+ ret = -ETIMEDOUT;
+ ret = rk_nfc_wait_for_xfer_done(nfc);
+
+ dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
+ DMA_TO_DEVICE);
+ dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
+ DMA_TO_DEVICE);
+ } else {
+ rk_nfc_write_buf(chip, buf, mtd->writesize + + mtd->oobsize);
+ }
+
+ if (ret)
+ return ret;
+
+ return nand_prog_page_end_op(chip);
+}
+
+static int rk_nfc_write_page_raw(struct nand_chip *chip, const u8 *buf,
+ int oob_on, int page)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+
+ rk_nfc_format_page(mtd, buf);
+ return rk_nfc_write_page(mtd, chip, nfc->buffer, page, 1);
+}
+
+static int rk_nfc_write_oob_std(struct nand_chip *chip, int page)
+{
+ return rk_nfc_write_page_raw(chip, NULL, 1, page);
+}
+
+static int rk_nfc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
+ u32 data_offs, u32 readlen,
+ u8 *buf, int page, int raw)
+{
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+ struct nand_ecc_ctrl *ecc = &chip->ecc;
+ dma_addr_t dma_data, dma_oob;
+ int oob_step = (ecc->bytes > 60) ? 128 : 64;
+ int bitflips = 0;
+ int ret, i, bch_st;
+ u8 *oob;
+ u32 tmp;
+
+ nand_read_page_op(chip, page, 0, NULL, 0);
+ if (!raw) {
+ dma_data = dma_map_single(nfc->dev, nfc->page_buf,
+ mtd->writesize,
+ DMA_FROM_DEVICE);
+ dma_oob = dma_map_single(nfc->dev, nfc->oob_buf,
+ ecc->steps * oob_step,
+ DMA_FROM_DEVICE);
+ init_completion(&nfc->done);
+ if (nfc->nfc_version == 6)
+ nfc_writel(nfc, INT_DMA, NFC_INTEN_V6);
+ else
+ nfc_writel(nfc, INT_DMA, NFC_INTEN_V9);
+ rk_nfc_xfer_start(nfc, NFC_READ, ecc->steps, dma_data,
+ dma_oob);
+ ret = wait_for_completion_timeout(&nfc->done,
+ msecs_to_jiffies(100));
+ if (!ret)
+ dev_warn(nfc->dev, "read ahb/dma done timeout\n");
+ rk_nfc_wait_for_xfer_done(nfc);
+ dma_unmap_single(nfc->dev, dma_data, mtd->writesize,
+ DMA_FROM_DEVICE);
+ dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step,
+ DMA_FROM_DEVICE);
+
+ for (i = 0; i < ecc->steps; i++) {
+ oob = chip->oob_poi + i * NFC_SYS_DATA_SIZE;
+ if (nfc->nfc_version == 6)
+ tmp = nfc->oob_buf[i * oob_step / 4];
+ else
+ tmp = nfc->oob_buf[i];
+ *oob++ = (u8)tmp;
+ *oob++ = (u8)(tmp >> 8);
+ *oob++ = (u8)(tmp >> 16);
+ *oob++ = (u8)(tmp >> 24);
+ }
+ swap(chip->oob_poi[0], chip->oob_poi[7]);
+ if (nfc->nfc_version == 6) {
+ for (i = 0; i < ecc->steps / 2; i++) {
+ bch_st = nfc_readl(nfc, NFC_BCH_ST_V6 + i * 4);
+ if (bch_st & BCH_ST_ERR0_V6 ||
+ bch_st & BCH_ST_ERR1_V6) {
+ mtd->ecc_stats.failed++;
+ bitflips = -1;
+ } else {
+ ret = ECC_ERR_CNT0_V6(bch_st);
+ mtd->ecc_stats.corrected += ret;
+ bitflips = max_t(u32, bitflips, ret);
+
+ ret = ECC_ERR_CNT1_V6(bch_st);
+ mtd->ecc_stats.corrected += ret;
+ bitflips = max_t(u32, bitflips, ret);
+ }
+ }
+ } else {
+ for (i = 0; i < ecc->steps / 2; i++) {
+ bch_st = nfc_readl(nfc, NFC_BCH_ST_V9 + i * 4);
+ if (bch_st & BCH_ST_ERR0_V9 ||
+ bch_st & BCH_ST_ERR0_V9) {
+ mtd->ecc_stats.failed++;
+ bitflips = -1;
+ } else {
+ ret = ECC_ERR_CNT0_V9(bch_st);
+ mtd->ecc_stats.corrected += ret;
+ bitflips = max_t(u32, bitflips, ret);
+
+ ret = ECC_ERR_CNT1_V9(bch_st);
+ mtd->ecc_stats.corrected += ret;
+ bitflips = max_t(u32, bitflips, ret);
+ }
+ }
+ }
+ memcpy(buf, nfc->page_buf, mtd->writesize);
+
+ if (bitflips == -1)
+ dev_err(nfc->dev, "read_page %x %x %x %x %x %x\n",
+ page, bitflips, bch_st, ((u32 *)buf)[0],
+ ((u32 *)buf)[1], (u32)dma_data);
+ } else {
+ rk_nfc_read_buf(chip, buf, mtd->writesize + mtd->oobsize);
+ }
+ return bitflips;
+}
+
+static int rk_nfc_write_page_hwecc(struct nand_chip *chip, const u8 *buf,
+ int oob_on, int page)
+{
+ return rk_nfc_write_page(nand_to_mtd(chip), chip, buf, page, 0);
+}
+
+static int rk_nfc_read_page_hwecc(struct nand_chip *chip, u8 *p, int oob_on,
+ int pg)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+
+ return rk_nfc_read_page(mtd, chip, 0, mtd->writesize, p, pg, 0);
+}
+
+static int rk_nfc_read_page_raw(struct nand_chip *chip, u8 *buf, int oob_on,
+ int page)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+ int i, ret;
+
+ ret = rk_nfc_read_page(mtd, chip, 0, mtd->writesize, nfc->buffer,
+ page, 1);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < chip->ecc.steps; i++) {
+ memcpy(oob_ptr(chip, i), rk_oob_ptr(chip, i),
+ NFC_SYS_DATA_SIZE);
+
+ if (buf)
+ memcpy(data_ptr(chip, buf, i), rk_data_ptr(chip, i),
+ chip->ecc.size);
+ }
+ swap(chip->oob_poi[0], chip->oob_poi[7]);
+
+ return ret;
+}
+
+static int rk_nfc_read_oob_std(struct nand_chip *chip, int page)
+{
+ return rk_nfc_read_page_raw(chip, NULL, 1, page);
+}
+
+static inline void rk_nfc_hw_init(struct rk_nfc *nfc)
+{
+ u32 val;
+
+ val = nfc_readl(nfc, NFC_VER_V9);
+ if (val == NFC_VERSION_9) {
+ nfc->nfc_version = 9;
+ nfc->max_ecc_strength = 70;
+ } else {
+ nfc->nfc_version = 6;
+ val = nfc_readl(nfc, NFC_VER_V6);
+ if (val == 0x801)
+ nfc->max_ecc_strength = 16;
+ else
+ nfc->max_ecc_strength = 60;
+ }
+
+ /* disable flash wp */
+ nfc_writel(nfc, FMCTL_WP, NFC_FMCTL);
+ /* config default timing */
+ nfc_writel(nfc, 0x1081, NFC_FMWAIT);
+ /* disable randomizer and dma */
+
+ if (nfc->nfc_version == 6) {
+ nfc_writel(nfc, 0, NFC_RANDMZ_V6);
+ nfc_writel(nfc, 0, NFC_DMA_CFG_V6);
+ nfc_writel(nfc, FLCTL_RST, NFC_FLCTL_V6);
+ } else {
+ nfc_writel(nfc, 0, NFC_RANDMZ_V9);
+ nfc_writel(nfc, 0, NFC_DMA_CFG_V9);
+ nfc_writel(nfc, FLCTL_RST, NFC_FLCTL_V9);
+ }
+}
+
+static irqreturn_t rk_nfc_irq(int irq, void *id)
+{
+ struct rk_nfc *nfc = id;
+ u32 sta, ien;
+
+ if (nfc->nfc_version == 6) {
+ sta = nfc_readl(nfc, NFC_INTST_V6);
+ ien = nfc_readl(nfc, NFC_INTEN_V6);
+ } else {
+ sta = nfc_readl(nfc, NFC_INTST_V9);
+ ien = nfc_readl(nfc, NFC_INTEN_V9);
+ }
+
+ if (!(sta & ien))
+ return IRQ_NONE;
+ if (nfc->nfc_version == 6) {
+ nfc_writel(nfc, sta, NFC_INTCLR_V6);
+ nfc_writel(nfc, ~sta & ien, NFC_INTEN_V6);
+ } else {
+ nfc_writel(nfc, sta, NFC_INTCLR_V9);
+ nfc_writel(nfc, ~sta & ien, NFC_INTEN_V9);
+ }
+ complete(&nfc->done);
+
+ return IRQ_HANDLED;
+}
+
+static int rk_nfc_enable_clk(struct device *dev, struct rk_nfc_clk *clk)
+{
+ int ret;
+
+ ret = clk_prepare_enable(clk->nfc_clk);
+ if (ret) {
+ dev_err(dev, "failed to enable nfc clk\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(clk->ahb_clk);
+ if (ret) {
+ dev_err(dev, "failed to enable ahb clk\n");
+ clk_disable_unprepare(clk->nfc_clk);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void rk_nfc_disable_clk(struct rk_nfc_clk *clk)
+{
+ clk_disable_unprepare(clk->nfc_clk);
+ clk_disable_unprepare(clk->ahb_clk);
+}
+
+static int rk_nfc_ooblayout_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oob_region)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ if (section >= chip->ecc.steps)
+ return -ERANGE;
+
+ if (!section) {
+ /* The first byte is bad block mask flag */
+ oob_region->length = NFC_SYS_DATA_SIZE - 1;
+ oob_region->offset = 1;
+ } else {
+ oob_region->length = NFC_SYS_DATA_SIZE;
+ oob_region->offset = section * NFC_SYS_DATA_SIZE;
+ }
+
+ return 0;
+}
+
+static int rk_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oob_region)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ if (section)
+ return -ERANGE;
+
+ oob_region->offset = NFC_SYS_DATA_SIZE * chip->ecc.steps;
+ oob_region->length = mtd->oobsize - oob_region->offset;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops rk_nfc_ooblayout_ops = {
+ .free = rk_nfc_ooblayout_free,
+ .ecc = rk_nfc_ooblayout_ecc,
+};
+
+static int rk_nfc_hw_ecc_setup(struct mtd_info *mtd,
+ struct nand_ecc_ctrl *ecc,
+ uint32_t strength)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+ struct rk_nfc *nfc = nand_get_controller_data(nand);
+ u32 reg;
+
+ ecc->strength = strength;
+ ecc->steps = mtd->writesize / ecc->size;
+ ecc->bytes = DIV_ROUND_UP(ecc->strength * 14, 8);
+ /* HW ECC always work with even numbers of ECC bytes */
+ ecc->bytes = ALIGN(ecc->bytes, 2);
+
+ if (nfc->nfc_version == 6) {
+ switch (ecc->strength) {
+ case 60:
+ reg = 0x00040010;
+ break;
+ case 40:
+ reg = 0x00040000;
+ break;
+ case 24:
+ reg = 0x00000010;
+ break;
+ case 16:
+ reg = 0x00000000;
+ break;
+ default:
+ return -EINVAL;
+ }
+ nfc_writel(nfc, reg, NFC_BCHCTL_V6);
+ } else {
+ switch (ecc->strength) {
+ case 70:
+ reg = 0x00000001;
+ break;
+ case 60:
+ reg = 0x06000001;
+ break;
+ case 40:
+ reg = 0x04000001;
+ break;
+ case 16:
+ reg = 0x02000001;
+ break;
+ default:
+ return -EINVAL;
+ }
+ nfc_writel(nfc, reg, NFC_BCHCTL_V9);
+ }
+
+ return 0;
+}
+
+static int rk_nfc_ecc_init(struct device *dev, struct mtd_info *mtd)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+ struct rk_nfc *nfc = nand_get_controller_data(nand);
+ struct nand_ecc_ctrl *ecc = &nand->ecc;
+ static u8 strengths_v9[4] = {70, 60, 40, 16};
+ static u8 strengths_v6[4] = {60, 40, 24, 16};
+ u8 *strengths;
+ u32 max_strength;
+ int i;
+
+ /* support only ecc hw mode */
+ if (ecc->mode != NAND_ECC_HW) {
+ dev_err(dev, "ecc.mode not supported\n");
+ return -EINVAL;
+ }
+
+ /* if optional dt settings not present */
+ if (!ecc->size || !ecc->strength ||
+ ecc->strength > nfc->max_ecc_strength) {
+ /* use datasheet requirements */
+ ecc->strength = nand->base.eccreq.strength;
+ ecc->size = nand->base.eccreq.step_size;
+
+ /*
+ * align eccstrength and eccsize
+ * this controller only supports 512 and 1024 sizes
+ */
+ if (nand->ecc.size < 1024) {
+ if (mtd->writesize > 512) {
+ nand->ecc.size = 1024;
+ nand->ecc.strength <<= 1;
+ } else {
+ dev_err(dev, "ecc.size not supported\n");
+ return -EINVAL;
+ }
+ } else {
+ nand->ecc.size = 1024;
+ }
+
+ ecc->steps = mtd->writesize / ecc->size;
+ max_strength = ((mtd->oobsize / ecc->steps) - 4) * 8 / 14;
+ if (max_strength > nfc->max_ecc_strength)
+ max_strength = nfc->max_ecc_strength;
+
+ strengths = strengths_v9;
+ if (nfc->nfc_version == 6)
+ strengths = strengths_v6;
+
+ for (i = 0; i < 4; i++) {
+ if (max_strength >= strengths[i])
+ break;
+ }
+
+ if (i >= 4) {
+ dev_err(nfc->dev, "unsupported strength\n");
+ return -ENOTSUPP;
+ }
+
+ ecc->strength = strengths[i];
+ }
+ rk_nfc_hw_ecc_setup(mtd, ecc, ecc->strength);
+ dev_info(dev, "eccsize %d eccstrength %d\n",
+ nand->ecc.size, nand->ecc.strength);
+ return 0;
+}
+
+static int rk_nfc_attach_chip(struct nand_chip *chip)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct device *dev = mtd->dev.parent;
+ struct rk_nfc *nfc = nand_get_controller_data(chip);
+ struct rk_nfc_nand_chip *rk_nand = to_rk_nand(chip);
+ struct nand_ecc_ctrl *ecc = &chip->ecc;
+ int len;
+ int ret;
+
+ if (chip->options & NAND_BUSWIDTH_16) {
+ dev_err(dev, "16bits buswidth not supported");
+ return -EINVAL;
+ }
+
+ ret = rk_nfc_ecc_init(dev, mtd);
+ if (ret)
+ return ret;
+ rk_nand->spare_per_sector = ecc->bytes + NFC_SYS_DATA_SIZE;
+
+ /* Check buffer first, avoid duplicate alloc buffer */
+ if (nfc->buffer)
+ return 0;
+
+ len = mtd->writesize + mtd->oobsize;
+ nfc->buffer = devm_kzalloc(dev, len, GFP_KERNEL | GFP_DMA);
+ if (!nfc->buffer)
+ return -ENOMEM;
+
+ nfc->page_buf = nfc->buffer;
+ len = ecc->steps * 128;
+ nfc->oob_buf = devm_kzalloc(dev, len, GFP_KERNEL | GFP_DMA);
+ if (!nfc->oob_buf) {
+ devm_kfree(dev, nfc->buffer);
+ nfc->buffer = NULL;
+ nfc->oob_buf = NULL;
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static const struct nand_controller_ops rk_nfc_controller_ops = {
+ .attach_chip = rk_nfc_attach_chip,
+ .setup_data_interface = rk_nfc_setup_data_interface,
+};
+
+static int rk_nfc_nand_chip_init(struct device *dev, struct rk_nfc *nfc,
+ struct device_node *np)
+{
+ struct rk_nfc_nand_chip *chip;
+ struct nand_chip *nand;
+ struct mtd_info *mtd;
+ int nsels;
+ u32 tmp;
+ int ret;
+ int i;
+
+ if (!of_get_property(np, "reg", &nsels))
+ return -ENODEV;
+ nsels /= sizeof(u32);
+ if (!nsels || nsels > RK_NAND_MAX_NSELS) {
+ dev_err(dev, "invalid reg property size %d\n", nsels);
+ return -EINVAL;
+ }
+
+ chip = devm_kzalloc(dev, sizeof(*chip) + nsels * sizeof(u8),
+ GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->nsels = nsels;
+ for (i = 0; i < nsels; i++) {
+ ret = of_property_read_u32_index(np, "reg", i, &tmp);
+ if (ret) {
+ dev_err(dev, "reg property failure : %d\n", ret);
+ return ret;
+ }
+
+ if (tmp >= RK_NAND_MAX_NSELS) {
+ dev_err(dev, "invalid CS: %u\n", tmp);
+ return -EINVAL;
+ }
+
+ if (test_and_set_bit(tmp, &nfc->assigned_cs)) {
+ dev_err(dev, "CS %u already assigned\n", tmp);
+ return -EINVAL;
+ }
+
+ chip->sels[i] = tmp;
+ }
+
+ nand = &chip->nand;
+ nand->controller = &nfc->controller;
+
+ nand_set_flash_node(nand, np);
+ nand_set_controller_data(nand, nfc);
+
+ nand->options |= NAND_USE_BOUNCE_BUFFER | NAND_NO_SUBPAGE_WRITE;
+ nand->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
+ nand->legacy.dev_ready = rk_nfc_dev_ready;
+ nand->legacy.select_chip = rk_nfc_select_chip;
+ nand->legacy.write_byte = rk_nfc_write_byte;
+ nand->legacy.write_buf = rk_nfc_write_buf;
+ nand->legacy.read_byte = rk_nfc_read_byte;
+ nand->legacy.read_buf = rk_nfc_read_buf;
+ nand->legacy.cmd_ctrl = rk_nfc_cmd_ctrl;
+
+ /* set default mode in case dt entry is missing */
+ nand->ecc.mode = NAND_ECC_HW;
+
+ nand->ecc.write_page_raw = rk_nfc_write_page_raw;
+ nand->ecc.write_page = rk_nfc_write_page_hwecc;
+ nand->ecc.write_oob_raw = rk_nfc_write_oob_std;
+ nand->ecc.write_oob = rk_nfc_write_oob_std;
+
+ nand->ecc.read_page_raw = rk_nfc_read_page_raw;
+ nand->ecc.read_page = rk_nfc_read_page_hwecc;
+ nand->ecc.read_oob_raw = rk_nfc_read_oob_std;
+ nand->ecc.read_oob = rk_nfc_read_oob_std;
+
+ mtd = nand_to_mtd(nand);
+ mtd->owner = THIS_MODULE;
+ mtd->dev.parent = dev;
+ mtd->name = THIS_NAME;
+ mtd_set_ooblayout(mtd, &rk_nfc_ooblayout_ops);
+ rk_nfc_hw_init(nfc);
+ ret = nand_scan(nand, nsels);
+ if (ret)
+ return ret;
+ ret = mtd_device_register(mtd, NULL, 0);
+ if (ret) {
+ dev_err(dev, "mtd parse partition error\n");
+ nand_release(nand);
+ return ret;
+ }
+
+ list_add_tail(&chip->node, &nfc->chips);
+
+ return 0;
+}
+
+static int rk_nfc_nand_chips_init(struct device *dev, struct rk_nfc *nfc)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *nand_np;
+ int ret = -EINVAL;
+ int tmp;
+
+ for_each_child_of_node(np, nand_np) {
+ tmp = rk_nfc_nand_chip_init(dev, nfc, nand_np);
+ if (tmp) {
+ of_node_put(nand_np);
+ return ret;
+ }
+ /* At least one nand chip is initialized */
+ ret = 0;
+ }
+ return ret;
+}
+
+static const struct of_device_id rk_nfc_id_table[] = {
+ {.compatible = "rockchip,nfc"},
+ {}
+};
+MODULE_DEVICE_TABLE(of, rk_nfc_id_table);
+
+static int rk_nfc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rk_nfc *nfc;
+ struct resource *res;
+ int ret, irq;
+
+ nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL);
+ if (!nfc)
+ return -ENOMEM;
+
+ nand_controller_init(&nfc->controller);
+ INIT_LIST_HEAD(&nfc->chips);
+ nfc->controller.ops = &rk_nfc_controller_ops;
+ nfc->dev = dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ nfc->regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(nfc->regs)) {
+ ret = PTR_ERR(nfc->regs);
+ goto release_nfc;
+ }
+ nfc->clk.nfc_clk = devm_clk_get(dev, "clk_nfc");
+ if (IS_ERR(nfc->clk.nfc_clk)) {
+ dev_err(dev, "no clk\n");
+ ret = PTR_ERR(nfc->clk.nfc_clk);
+ goto release_nfc;
+ }
+ nfc->clk.ahb_clk = devm_clk_get(dev, "clk_ahb");
+ if (IS_ERR(nfc->clk.ahb_clk)) {
+ dev_err(dev, "no pad clk\n");
+ ret = PTR_ERR(nfc->clk.ahb_clk);
+ goto release_nfc;
+ }
+ if (of_property_read_u32(dev->of_node, "clock-rates",
+ &nfc->clk.nfc_rate))
+ nfc->clk.nfc_rate = RK_DEFAULT_CLOCK_RATE;
+ clk_set_rate(nfc->clk.nfc_clk, nfc->clk.nfc_rate);
+
+ ret = rk_nfc_enable_clk(dev, &nfc->clk);
+ if (ret)
+ goto release_nfc;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "no nfc irq resource\n");
+ ret = -EINVAL;
+ goto clk_disable;
+ }
+
+ if (nfc->nfc_version == 6)
+ nfc_writel(nfc, 0, NFC_INTEN_V6);
+ else
+ nfc_writel(nfc, 0, NFC_INTEN_V9);
+ ret = devm_request_irq(dev, irq, rk_nfc_irq, 0x0, "rk-nand", nfc);
+ if (ret) {
+ dev_err(dev, "failed to request nfc irq\n");
+ goto clk_disable;
+ }
+
+ platform_set_drvdata(pdev, nfc);
+
+ ret = rk_nfc_nand_chips_init(dev, nfc);
+ if (ret) {
+ dev_err(dev, "failed to init nand chips\n");
+ goto clk_disable;
+ }
+ return 0;
+
+clk_disable:
+ rk_nfc_disable_clk(&nfc->clk);
+release_nfc:
+ return ret;
+}
+
+static int rk_nfc_remove(struct platform_device *pdev)
+{
+ struct rk_nfc *nfc = platform_get_drvdata(pdev);
+ struct rk_nfc_nand_chip *chip;
+
+ while (!list_empty(&nfc->chips)) {
+ chip = list_first_entry(&nfc->chips, struct rk_nfc_nand_chip,
+ node);
+ nand_release(&chip->nand);
+ list_del(&chip->node);
+ }
+
+ rk_nfc_disable_clk(&nfc->clk);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rk_nfc_suspend(struct device *dev)
+{
+ struct rk_nfc *nfc = dev_get_drvdata(dev);
+
+ rk_nfc_disable_clk(&nfc->clk);
+
+ return 0;
+}
+
+static int rk_nfc_resume(struct device *dev)
+{
+ struct rk_nfc *nfc = dev_get_drvdata(dev);
+ struct rk_nfc_nand_chip *chip;
+ struct nand_chip *nand;
+ int ret;
+ u32 i;
+
+ udelay(200);
+
+ ret = rk_nfc_enable_clk(dev, &nfc->clk);
+ if (ret)
+ return ret;
+
+ /* reset NAND chip if VCC was powered off */
+ list_for_each_entry(chip, &nfc->chips, node) {
+ nand = &chip->nand;
+ for (i = 0; i < chip->nsels; i++)
+ nand_reset(nand, i);
+ }
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rk_nfc_pm_ops, rk_nfc_suspend, rk_nfc_resume);
+#endif
+
+static struct platform_driver rk_nfc_driver = {
+ .probe = rk_nfc_probe,
+ .remove = rk_nfc_remove,
+ .driver = {
+ .name = THIS_NAME,
+ .of_match_table = rk_nfc_id_table,
+#ifdef CONFIG_PM_SLEEP
+ .pm = &rk_nfc_pm_ops,
+#endif
+ },
+};
+
+module_platform_driver(rk_nfc_driver);
+
+MODULE_LICENSE("Dual MIT/GPL");
+MODULE_AUTHOR("Yifeng Zhao <yifeng.zhao@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Rockchip Nand Flash Controller Driver");
+MODULE_ALIAS("platform:rockchip_nand");
--
2.17.1
