@@ -545,4 +545,11 @@ config MTD_NAND_DISKONCHIP_BBTWRITE
load time (assuming you build diskonchip as a module) with the module
parameter "inftl_bbt_write=1".
+config MTD_NAND_PL353
+ tristate "ARM Pl353 NAND flash driver"
+ depends on MTD_RAW_NAND && ARM
+ depends on PL353_SMC
+ help
+ Enables support for PrimeCell Static Memory Controller PL353
+
endif # MTD_RAW_NAND
@@ -57,6 +57,7 @@ obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
obj-$(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_PL353) += pl353_nand.o
nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o nand_ids.o
nand-objs += nand_onfi.o
new file mode 100644
@@ -0,0 +1,1228 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ARM PL353 NAND flash controller driver
+ *
+ * Copyright (C) 2017 Xilinx, Inc
+ * Author: Punnaiah chowdary kalluri <punnaiah@xilinx.com>
+ * Author: Naga Sureshkumar Relli <nagasure@xilinx.com>
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/mtd/partitions.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pl353-smc.h>
+#include <linux/clk.h>
+
+#define PL353_NAND_DRIVER_NAME "pl353-nand"
+
+/* NAND flash driver defines */
+#define PL353_NAND_ECC_SIZE 512 /* Size of data for ECC operation */
+
+/* AXI Address definitions */
+#define START_CMD_SHIFT 3
+#define END_CMD_SHIFT 11
+#define END_CMD_VALID_SHIFT 20
+#define ADDR_CYCLES_SHIFT 21
+#define CLEAR_CS_SHIFT 21
+#define ECC_LAST_SHIFT 10
+#define COMMAND_PHASE (0 << 19)
+#define DATA_PHASE BIT(19)
+#define GET_ADDR(pos, val) (((val) & 0xFF) << (8 * (pos)))
+
+#define PL353_NAND_ECC_LAST BIT(ECC_LAST_SHIFT) /* Set ECC_Last */
+#define PL353_NAND_CLEAR_CS BIT(CLEAR_CS_SHIFT) /* Clear chip select */
+
+#define PL353_NAND_ECC_BUSY_TIMEOUT (1 * HZ)
+#define PL353_NAND_DEV_BUSY_TIMEOUT (1 * HZ)
+#define PL353_NAND_LAST_TRANSFER_LENGTH 4
+#define PL353_NAND_ECC_VALID_SHIFT 24
+#define PL353_NAND_ECC_VALID_MASK 0x40
+#define PL353_ECC_BITS_BYTEOFF_MASK 0x1FF
+#define PL353_ECC_BITS_BITOFF_MASK 0x7
+#define PL353_ECC_BIT_MASK 0xFFF
+#define PL353_TREA_MAX_VALUE 1
+#define PL353_MAX_ECC_CHUNKS 4
+#define PL353_MAX_ECC_BYTES 3
+
+struct pl353_nfc_op {
+ u32 cmnds[2];
+ u32 addrs;
+ unsigned int data_instr_idx;
+ unsigned int rdy_timeout_ms;
+ unsigned int rdy_delay_ns;
+ const struct nand_op_instr *data_instr;
+};
+
+/**
+ * struct pl353_nand_controller - Defines the NAND flash controller driver
+ * instance
+ * @controller: NAND controller structure
+ * @chip: NAND chip information structure
+ * @dev: Parent device (used to print error messages)
+ * @regs: Virtual address of the NAND flash device
+ * @dataphase_addrflags:Flags required for data phase transfers
+ * @addr_cycles: Address cycles
+ * @mclk_rate: Clock rate of the Memory controller
+ * @buswidth: Bus width 8 or 16
+ */
+struct pl353_nand_controller {
+ struct nand_controller controller;
+ struct nand_chip chip;
+ struct device *dev;
+ void __iomem *regs;
+ u32 dataphase_addrflags;
+ u8 addr_cycles;
+ ulong mclk_rate;
+ u32 buswidth;
+};
+
+static inline struct pl353_nand_controller *
+ to_pl353_nand(struct nand_chip *chip)
+{
+ return container_of(chip, struct pl353_nand_controller, chip);
+}
+
+static int pl353_ecc_ooblayout16_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ if (section >= chip->ecc.steps)
+ return -ERANGE;
+
+ oobregion->offset = (section * chip->ecc.bytes);
+ oobregion->length = chip->ecc.bytes;
+
+ return 0;
+}
+
+static int pl353_ecc_ooblayout16_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ if (section >= chip->ecc.steps)
+ return -ERANGE;
+
+ oobregion->offset = (section * chip->ecc.bytes) + 8;
+ oobregion->length = 8;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops pl353_ecc_ooblayout16_ops = {
+ .ecc = pl353_ecc_ooblayout16_ecc,
+ .free = pl353_ecc_ooblayout16_free,
+};
+
+static int pl353_ecc_ooblayout64_ecc(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ if (section >= chip->ecc.steps)
+ return -ERANGE;
+
+ oobregion->offset = (section * chip->ecc.bytes) + 52;
+ oobregion->length = chip->ecc.bytes;
+
+ return 0;
+}
+
+static int pl353_ecc_ooblayout64_free(struct mtd_info *mtd, int section,
+ struct mtd_oob_region *oobregion)
+{
+ if (section)
+ return -ERANGE;
+
+ oobregion->offset = 2;
+ oobregion->length = 50;
+
+ return 0;
+}
+
+static const struct mtd_ooblayout_ops pl353_ecc_ooblayout64_ops = {
+ .ecc = pl353_ecc_ooblayout64_ecc,
+ .free = pl353_ecc_ooblayout64_free,
+};
+
+/* Generic flash bbt decriptors */
+static u8 bbt_pattern[] = { 'B', 'b', 't', '0' };
+static u8 mirror_pattern[] = { '1', 't', 'b', 'B' };
+
+static struct nand_bbt_descr bbt_main_descr = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+ | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
+ .offs = 4,
+ .len = 4,
+ .veroffs = 20,
+ .maxblocks = 4,
+ .pattern = bbt_pattern
+};
+
+static struct nand_bbt_descr bbt_mirror_descr = {
+ .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE
+ | NAND_BBT_2BIT | NAND_BBT_VERSION | NAND_BBT_PERCHIP,
+ .offs = 4,
+ .len = 4,
+ .veroffs = 20,
+ .maxblocks = 4,
+ .pattern = mirror_pattern
+};
+
+static void pl353_nfc_force_byte_access(struct nand_chip *chip,
+ bool force_8bit)
+{
+ int ret;
+ struct pl353_nand_controller *xnfc =
+ container_of(chip, struct pl353_nand_controller, chip);
+
+ if (xnfc->buswidth == 8)
+ return;
+
+ if (force_8bit)
+ ret = pl353_smc_set_buswidth(PL353_SMC_MEM_WIDTH_8);
+ else
+ ret = pl353_smc_set_buswidth(PL353_SMC_MEM_WIDTH_16);
+
+ if (ret)
+ dev_err(xnfc->dev, "Error in Buswidth\n");
+}
+
+static inline int pl353_wait_for_dev_ready(struct nand_chip *chip)
+{
+ unsigned long timeout = jiffies + PL353_NAND_DEV_BUSY_TIMEOUT;
+
+ while (!pl353_smc_get_nand_int_status_raw()) {
+ if (time_after_eq(jiffies, timeout)) {
+ pr_err("%s timed out\n", __func__);
+ return -ETIMEDOUT;
+ }
+ cond_resched();
+ }
+
+ pl353_smc_clr_nand_int();
+
+ return 0;
+}
+
+/**
+ * pl353_nand_read_data_op - read chip data into buffer
+ * @chip: Pointer to the NAND chip info structure
+ * @in: Pointer to the buffer to store read data
+ * @len: Number of bytes to read
+ * @force_8bit: Force 8-bit bus access
+ * Return: Always return zero
+ */
+static void pl353_nand_read_data_op(struct nand_chip *chip, u8 *in,
+ unsigned int len, bool force_8bit)
+{
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ int i;
+
+ if (force_8bit)
+ pl353_nfc_force_byte_access(chip, true);
+
+ if ((IS_ALIGNED((uint32_t)in, sizeof(uint32_t)) &&
+ IS_ALIGNED(len, sizeof(uint32_t))) || !force_8bit) {
+ u32 *ptr = (u32 *)in;
+
+ len /= 4;
+ for (i = 0; i < len; i++)
+ ptr[i] = readl(xnfc->regs + xnfc->dataphase_addrflags);
+ } else {
+ for (i = 0; i < len; i++)
+ in[i] = readb(xnfc->regs + xnfc->dataphase_addrflags);
+ }
+
+ if (force_8bit)
+ pl353_nfc_force_byte_access(chip, false);
+}
+
+/**
+ * pl353_nand_write_data_op - write buffer to chip
+ * @chip: Pointer to the nand_chip structure
+ * @buf: Pointer to the buffer to store write data
+ * @len: Number of bytes to write
+ * @force_8bit: Force 8-bit bus access
+ */
+static void pl353_nand_write_data_op(struct nand_chip *chip, const u8 *buf,
+ int len, bool force_8bit)
+{
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ int i;
+
+ if (force_8bit)
+ pl353_nfc_force_byte_access(chip, true);
+
+ if ((IS_ALIGNED((uint32_t)buf, sizeof(uint32_t)) &&
+ IS_ALIGNED(len, sizeof(uint32_t))) || !force_8bit) {
+ u32 *ptr = (u32 *)buf;
+
+ len /= 4;
+ for (i = 0; i < len; i++)
+ writel(ptr[i], xnfc->regs + xnfc->dataphase_addrflags);
+ } else {
+ for (i = 0; i < len; i++)
+ writeb(buf[i], xnfc->regs + xnfc->dataphase_addrflags);
+ }
+
+ if (force_8bit)
+ pl353_nfc_force_byte_access(chip, false);
+}
+
+static inline int pl353_wait_for_ecc_done(void)
+{
+ unsigned long timeout = jiffies + PL353_NAND_ECC_BUSY_TIMEOUT;
+
+ while (pl353_smc_ecc_is_busy()) {
+ if (time_after_eq(jiffies, timeout)) {
+ pr_err("%s timed out\n", __func__);
+ return -ETIMEDOUT;
+ }
+ cond_resched();
+ }
+
+ return 0;
+}
+
+/**
+ * pl353_nand_calculate_hwecc - Calculate Hardware ECC
+ * @chip: Pointer to the nand_chip structure
+ * @data: Pointer to the page data
+ * @ecc: Pointer to the ECC buffer where ECC data needs to be stored
+ *
+ * This function retrieves the Hardware ECC data from the controller and returns
+ * ECC data back to the MTD subsystem.
+ * It operates on a number of 512 byte blocks of NAND memory and can be
+ * programmed to store the ECC codes after the data in memory. For writes,
+ * the ECC is written to the spare area of the page. For reads, the result of
+ * a block ECC check are made available to the device driver.
+ *
+ * ------------------------------------------------------------------------
+ * | n * 512 blocks | extra | ecc | |
+ * | | block | codes | |
+ * ------------------------------------------------------------------------
+ *
+ * The ECC calculation uses a simple Hamming code, using 1-bit correction 2-bit
+ * detection. It starts when a valid read or write command with a 512 byte
+ * aligned address is detected on the memory interface.
+ *
+ * Return: 0 on success or error value on failure
+ */
+static int pl353_nand_calculate_hwecc(struct nand_chip *chip,
+ const u8 *data, u8 *ecc)
+{
+ u32 ecc_value;
+ u8 chunk, ecc_byte, ecc_status;
+
+ for (chunk = 0; chunk < PL353_MAX_ECC_CHUNKS; chunk++) {
+ /* Read ECC value for each block */
+ ecc_value = pl353_smc_get_ecc_val(chunk);
+ ecc_status = (ecc_value >> PL353_NAND_ECC_VALID_SHIFT);
+
+ /* ECC value valid */
+ if (ecc_status & PL353_NAND_ECC_VALID_MASK) {
+ for (ecc_byte = 0; ecc_byte < PL353_MAX_ECC_BYTES;
+ ecc_byte++) {
+ /* Copy ECC bytes to MTD buffer */
+ *ecc = ~ecc_value & 0xFF;
+ ecc_value = ecc_value >> 8;
+ ecc++;
+ }
+ } else {
+ pr_warn("%s status failed\n", __func__);
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * pl353_nand_correct_data - ECC correction function
+ * @chip: Pointer to the nand_chip structure
+ * @buf: Pointer to the page data
+ * @read_ecc: Pointer to the ECC value read from spare data area
+ * @calc_ecc: Pointer to the calculated ECC value
+ *
+ * This function corrects the ECC single bit errors & detects 2-bit errors.
+ *
+ * Return: 0 if no ECC errors found
+ * 1 if single bit error found and corrected.
+ * -1 if multiple uncorrectable ECC errors found.
+ */
+static int pl353_nand_correct_data(struct nand_chip *chip, unsigned char *buf,
+ unsigned char *read_ecc,
+ unsigned char *calc_ecc)
+{
+ unsigned char bit_addr;
+ unsigned int byte_addr;
+ unsigned short ecc_odd, ecc_even, read_ecc_lower, read_ecc_upper;
+ unsigned short calc_ecc_lower, calc_ecc_upper;
+
+ read_ecc_lower = (read_ecc[0] | (read_ecc[1] << 8)) &
+ PL353_ECC_BIT_MASK;
+ read_ecc_upper = ((read_ecc[1] >> 4) | (read_ecc[2] << 4)) &
+ PL353_ECC_BIT_MASK;
+
+ calc_ecc_lower = (calc_ecc[0] | (calc_ecc[1] << 8)) &
+ PL353_ECC_BIT_MASK;
+ calc_ecc_upper = ((calc_ecc[1] >> 4) | (calc_ecc[2] << 4)) &
+ PL353_ECC_BIT_MASK;
+
+ ecc_odd = read_ecc_lower ^ calc_ecc_lower;
+ ecc_even = read_ecc_upper ^ calc_ecc_upper;
+
+ /* no error */
+ if (!ecc_odd && !ecc_even)
+ return 0;
+
+ if (ecc_odd == (~ecc_even & PL353_ECC_BIT_MASK)) {
+ /* bits [11:3] of error code is byte offset */
+ byte_addr = (ecc_odd >> 3) & PL353_ECC_BITS_BYTEOFF_MASK;
+ /* bits [2:0] of error code is bit offset */
+ bit_addr = ecc_odd & PL353_ECC_BITS_BITOFF_MASK;
+ /* Toggling error bit */
+ buf[byte_addr] ^= (BIT(bit_addr));
+ return 1;
+ }
+
+ /* one error in parity */
+ if (hweight32(ecc_odd | ecc_even) == 1)
+ return 1;
+
+ /* Uncorrectable error */
+ return -1;
+}
+
+static void pl353_prepare_cmd(struct nand_chip *chip,
+ int page, int column, int start_cmd, int end_cmd,
+ bool read)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ unsigned long cmd_phase_data = 0;
+ u32 end_cmd_valid = 0, cmdphase_addrflags;
+
+ end_cmd_valid = read ? 1 : 0;
+ cmdphase_addrflags = ((xnfc->addr_cycles
+ << ADDR_CYCLES_SHIFT) |
+ (end_cmd_valid << END_CMD_VALID_SHIFT) |
+ (COMMAND_PHASE) |
+ (end_cmd << END_CMD_SHIFT) |
+ (start_cmd << START_CMD_SHIFT));
+
+ /* Get the data phase address */
+ xnfc->dataphase_addrflags = ((0x0 << CLEAR_CS_SHIFT) |
+ (0 << END_CMD_VALID_SHIFT) |
+ (DATA_PHASE) |
+ (end_cmd << END_CMD_SHIFT) |
+ (0x0 << ECC_LAST_SHIFT));
+
+ if (chip->options & NAND_BUSWIDTH_16)
+ column /= 2;
+
+ cmd_phase_data = column;
+ if (mtd->writesize > PL353_NAND_ECC_SIZE) {
+ cmd_phase_data |= page << 16;
+
+ /* Another address cycle for devices > 128MiB */
+ if (chip->options & NAND_ROW_ADDR_3) {
+ writel_relaxed(cmd_phase_data,
+ xnfc->regs + cmdphase_addrflags);
+ cmd_phase_data = (page >> 16);
+ }
+ } else {
+ cmd_phase_data |= page << 8;
+ }
+
+ writel_relaxed(cmd_phase_data, xnfc->regs + cmdphase_addrflags);
+}
+
+/**
+ * pl353_nand_read_oob - [REPLACEABLE] the most common OOB data read function
+ * @chip: Pointer to the nand_chip structure
+ * @chip: Pointer to the nand_chip structure
+ * @page: Page number to read
+ *
+ * Return: Always return zero
+ */
+static int pl353_nand_read_oob(struct nand_chip *chip,
+ int page)
+{
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ u8 *p;
+
+ if (mtd->writesize < PL353_NAND_ECC_SIZE)
+ return 0;
+
+ pl353_prepare_cmd(chip, page, mtd->writesize, NAND_CMD_READ0,
+ NAND_CMD_READSTART, 1);
+ if (pl353_wait_for_dev_ready(chip))
+ return -ETIMEDOUT;
+
+ p = chip->oob_poi;
+ pl353_nand_read_data_op(chip, p,
+ (mtd->oobsize -
+ PL353_NAND_LAST_TRANSFER_LENGTH), false);
+ p += (mtd->oobsize - PL353_NAND_LAST_TRANSFER_LENGTH);
+ xnfc->dataphase_addrflags |= PL353_NAND_CLEAR_CS;
+ pl353_nand_read_data_op(chip, p, PL353_NAND_LAST_TRANSFER_LENGTH,
+ false);
+
+ return 0;
+}
+
+/**
+ * pl353_nand_write_oob - [REPLACEABLE] the most common OOB data write function
+ * @chip: Pointer to the nand_chip structure
+ * @chip: Pointer to the NAND chip info structure
+ * @page: Page number to write
+ *
+ * Return: Zero on success and EIO on failure
+ */
+static int pl353_nand_write_oob(struct nand_chip *chip,
+ int page)
+{
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ const u8 *buf = chip->oob_poi;
+
+ pl353_prepare_cmd(chip, page, mtd->writesize, NAND_CMD_SEQIN,
+ NAND_CMD_PAGEPROG, 0);
+
+ pl353_nand_write_data_op(chip, buf,
+ (mtd->oobsize -
+ PL353_NAND_LAST_TRANSFER_LENGTH), false);
+ buf += (mtd->oobsize - PL353_NAND_LAST_TRANSFER_LENGTH);
+ xnfc->dataphase_addrflags |= PL353_NAND_CLEAR_CS;
+ xnfc->dataphase_addrflags |= (1 << END_CMD_VALID_SHIFT);
+ pl353_nand_write_data_op(chip, buf, PL353_NAND_LAST_TRANSFER_LENGTH,
+ false);
+ if (pl353_wait_for_dev_ready(chip))
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+/**
+ * pl353_nand_read_page_raw - [Intern] read page data without ecc
+ * @chip: Pointer to the nand_chip structure
+ * @buf: Pointer to the data buffer
+ * @oob_required: Caller requires OOB data read to chip->oob_poi
+ * @page: Page number to read
+ *
+ * Return: Always return zero
+ */
+static int pl353_nand_read_page_raw(struct nand_chip *chip,
+ u8 *buf, int oob_required, int page)
+{
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ u8 *p;
+
+ pl353_prepare_cmd(chip, page, 0, NAND_CMD_READ0,
+ NAND_CMD_READSTART, 1);
+ if (pl353_wait_for_dev_ready(chip))
+ return -ETIMEDOUT;
+
+ pl353_nand_read_data_op(chip, buf, mtd->writesize, false);
+ p = chip->oob_poi;
+ pl353_nand_read_data_op(chip, p,
+ (mtd->oobsize -
+ PL353_NAND_LAST_TRANSFER_LENGTH), false);
+ p += (mtd->oobsize - PL353_NAND_LAST_TRANSFER_LENGTH);
+ xnfc->dataphase_addrflags |= PL353_NAND_CLEAR_CS;
+ pl353_nand_read_data_op(chip, p, PL353_NAND_LAST_TRANSFER_LENGTH,
+ false);
+
+ return 0;
+}
+
+/**
+ * pl353_nand_write_page_raw - [Intern] raw page write function
+ * @chip: Pointer to the nand_chip structure
+ * @buf: Pointer to the data buffer
+ * @oob_required: Caller requires OOB data read to chip->oob_poi
+ * @page: Page number to write
+ *
+ * Return: Always return zero
+ */
+static int pl353_nand_write_page_raw(struct nand_chip *chip,
+ const u8 *buf, int oob_required,
+ int page)
+{
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ u8 *p;
+
+ pl353_prepare_cmd(chip, page, 0, NAND_CMD_SEQIN,
+ NAND_CMD_PAGEPROG, 0);
+ pl353_nand_write_data_op(chip, buf, mtd->writesize, false);
+ p = chip->oob_poi;
+ pl353_nand_write_data_op(chip, p,
+ (mtd->oobsize -
+ PL353_NAND_LAST_TRANSFER_LENGTH), false);
+ p += (mtd->oobsize - PL353_NAND_LAST_TRANSFER_LENGTH);
+ xnfc->dataphase_addrflags |= PL353_NAND_CLEAR_CS;
+ xnfc->dataphase_addrflags |= (1 << END_CMD_VALID_SHIFT);
+ pl353_nand_write_data_op(chip, p, PL353_NAND_LAST_TRANSFER_LENGTH,
+ false);
+ if (pl353_wait_for_dev_ready(chip))
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+/**
+ * nand_write_page_hwecc - Hardware ECC based page write function
+ * @chip: Pointer to the nand_chip structure
+ * @buf: Pointer to the data buffer
+ * @oob_required: Caller requires OOB data read to chip->oob_poi
+ * @page: Page number to write
+ *
+ * This functions writes data and hardware generated ECC values in to the page.
+ *
+ * Return: Always return zero
+ */
+static int pl353_nand_write_page_hwecc(struct nand_chip *chip,
+ const u8 *buf, int oob_required,
+ int page)
+{
+ int eccsize = chip->ecc.size;
+ int eccsteps = chip->ecc.steps;
+ u8 *ecc_calc = chip->ecc.calc_buf;
+ u8 *oob_ptr;
+ const u8 *p = buf;
+ u32 ret;
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ struct mtd_info *mtd = nand_to_mtd(chip);
+
+ pl353_prepare_cmd(chip, page, 0, NAND_CMD_SEQIN,
+ NAND_CMD_PAGEPROG, 0);
+
+ for ( ; (eccsteps - 1); eccsteps--) {
+ pl353_nand_write_data_op(chip, p, eccsize, false);
+ p += eccsize;
+ }
+
+ pl353_nand_write_data_op(chip, p,
+ (eccsize - PL353_NAND_LAST_TRANSFER_LENGTH),
+ false);
+ p += (eccsize - PL353_NAND_LAST_TRANSFER_LENGTH);
+
+ /* Set ECC Last bit to 1 */
+ xnfc->dataphase_addrflags |= PL353_NAND_ECC_LAST;
+ pl353_nand_write_data_op(chip, p, PL353_NAND_LAST_TRANSFER_LENGTH,
+ false);
+
+ /* Wait till the ECC operation is complete or timeout */
+ ret = pl353_wait_for_ecc_done();
+ if (ret)
+ dev_err(xnfc->dev, "ECC Timeout\n");
+
+ p = buf;
+ ret = chip->ecc.calculate(chip, p, &ecc_calc[0]);
+ if (ret)
+ return ret;
+
+ /* Wait for ECC to be calculated and read the error values */
+ ret = mtd_ooblayout_set_eccbytes(mtd, ecc_calc, chip->oob_poi,
+ 0, chip->ecc.total);
+ if (ret)
+ return ret;
+
+ /* Clear ECC last bit */
+ xnfc->dataphase_addrflags &= ~PL353_NAND_ECC_LAST;
+
+ /* Write the spare area with ECC bytes */
+ oob_ptr = chip->oob_poi;
+ pl353_nand_write_data_op(chip, oob_ptr,
+ (mtd->oobsize -
+ PL353_NAND_LAST_TRANSFER_LENGTH), false);
+
+ xnfc->dataphase_addrflags |= PL353_NAND_CLEAR_CS;
+ xnfc->dataphase_addrflags |= (1 << END_CMD_VALID_SHIFT);
+ oob_ptr += (mtd->oobsize - PL353_NAND_LAST_TRANSFER_LENGTH);
+ pl353_nand_write_data_op(chip, oob_ptr, PL353_NAND_LAST_TRANSFER_LENGTH,
+ false);
+ if (pl353_wait_for_dev_ready(chip))
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+/**
+ * pl353_nand_read_page_hwecc - Hardware ECC based page read function
+ * @chip: Pointer to the nand_chip structure
+ * @buf: Pointer to the buffer to store read data
+ * @oob_required: Caller requires OOB data read to chip->oob_poi
+ * @page: Page number to read
+ *
+ * This functions reads data and checks the data integrity by comparing
+ * hardware generated ECC values and read ECC values from spare area.
+ * There is a limitation in SMC controller, that we must set ECC LAST on
+ * last data phase access, to tell ECC block not to expect any data further.
+ * Ex: When number of ECC STEPS are 4, then till 3 we will write to flash
+ * using SMC with HW ECC enabled. And for the last ECC STEP, we will subtract
+ * 4bytes from page size, and will initiate a transfer. And the remaining 4 as
+ * one more transfer with ECC_LAST bit set in NAND data phase register to
+ * notify ECC block not to expect any more data. The last block should be align
+ * with end of 512 byte block. Because of this limitation, we are not using
+ * core routines.
+ *
+ * Return: 0 always and updates ECC operation status in to MTD structure
+ */
+static int pl353_nand_read_page_hwecc(struct nand_chip *chip,
+ u8 *buf, int oob_required, int page)
+{
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ int i, stat, eccsize = chip->ecc.size;
+ int eccbytes = chip->ecc.bytes;
+ int eccsteps = chip->ecc.steps;
+ unsigned int max_bitflips = 0;
+ u8 *p = buf;
+ u8 *ecc_calc = chip->ecc.calc_buf;
+ u8 *ecc = chip->ecc.code_buf;
+ u8 *oob_ptr;
+ u32 ret;
+
+ pl353_prepare_cmd(chip, page, 0, NAND_CMD_READ0,
+ NAND_CMD_READSTART, 1);
+ if (pl353_wait_for_dev_ready(chip))
+ return -ETIMEDOUT;
+
+ for ( ; (eccsteps - 1); eccsteps--) {
+ pl353_nand_read_data_op(chip, p, eccsize, false);
+ p += eccsize;
+ }
+
+ pl353_nand_read_data_op(chip, p,
+ (eccsize - PL353_NAND_LAST_TRANSFER_LENGTH),
+ false);
+ p += (eccsize - PL353_NAND_LAST_TRANSFER_LENGTH);
+
+ /* Set ECC Last bit to 1 */
+ xnfc->dataphase_addrflags |= PL353_NAND_ECC_LAST;
+ pl353_nand_read_data_op(chip, p, PL353_NAND_LAST_TRANSFER_LENGTH,
+ false);
+
+ /* Wait till the ECC operation is complete or timeout */
+ ret = pl353_wait_for_ecc_done();
+ if (ret)
+ dev_err(xnfc->dev, "ECC Timeout\n");
+
+ /* Read the calculated ECC value */
+ p = buf;
+ ret = chip->ecc.calculate(chip, p, &ecc_calc[0]);
+ if (ret)
+ return ret;
+
+ /* Clear ECC last bit */
+ xnfc->dataphase_addrflags &= ~PL353_NAND_ECC_LAST;
+
+ /* Read the stored ECC value */
+ oob_ptr = chip->oob_poi;
+ pl353_nand_read_data_op(chip, oob_ptr,
+ (mtd->oobsize -
+ PL353_NAND_LAST_TRANSFER_LENGTH), false);
+
+ /* de-assert chip select */
+ xnfc->dataphase_addrflags |= PL353_NAND_CLEAR_CS;
+ oob_ptr += (mtd->oobsize - PL353_NAND_LAST_TRANSFER_LENGTH);
+ pl353_nand_read_data_op(chip, oob_ptr, PL353_NAND_LAST_TRANSFER_LENGTH,
+ false);
+
+ ret = mtd_ooblayout_get_eccbytes(mtd, ecc, chip->oob_poi, 0,
+ chip->ecc.total);
+ if (ret)
+ return ret;
+
+ eccsteps = chip->ecc.steps;
+ p = buf;
+
+ /* Check ECC error for all blocks and correct if it is correctable */
+ for (i = 0 ; eccsteps; eccsteps--, i += eccbytes, p += eccsize) {
+ stat = chip->ecc.correct(chip, p, &ecc[i], &ecc_calc[i]);
+ if (stat < 0) {
+ mtd->ecc_stats.failed++;
+ } else {
+ mtd->ecc_stats.corrected += stat;
+ max_bitflips = max_t(unsigned int, max_bitflips, stat);
+ }
+ }
+
+ return max_bitflips;
+}
+
+static int pl353_nand_exec_op_cmd(struct nand_chip *chip,
+ const struct nand_subop *subop)
+{
+ struct pl353_nfc_op nfc_op = {};
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ unsigned long end_cmd_valid = 0;
+ unsigned int op_id, len;
+ bool reading;
+ u32 cmdphase_addrflags;
+ const struct nand_op_instr *instr = NULL;
+ int i;
+ u32 col = 0, row = 0;
+ u32 naddrs = 0;
+ u8 val;
+
+ memset(&nfc_op, 0, sizeof(struct pl353_nfc_op));
+ for (op_id = 0; op_id < subop->ninstrs; op_id++) {
+ instr = &subop->instrs[op_id];
+
+ switch (instr->type) {
+ case NAND_OP_CMD_INSTR:
+ if (op_id) {
+ nfc_op.cmnds[1] = instr->ctx.cmd.opcode;
+
+ /*
+ * end_cmd_valid is set when there is a
+ * command cycle followed by Address cycle
+ */
+ if (naddrs)
+ end_cmd_valid = 1;
+ } else {
+ nfc_op.cmnds[0] = instr->ctx.cmd.opcode;
+ end_cmd_valid = 0;
+ }
+
+ break;
+
+ case NAND_OP_ADDR_INSTR:
+ i = nand_subop_get_addr_start_off(subop, op_id);
+ naddrs = nand_subop_get_num_addr_cyc(subop,
+ op_id);
+ for (; i < naddrs; i++) {
+ val = instr->ctx.addr.addrs[i];
+
+ if (i < 2)
+ col |= GET_ADDR(i, val);
+ else
+ row |= GET_ADDR(i - 2, val);
+ }
+
+ break;
+
+ case NAND_OP_DATA_IN_INSTR:
+ case NAND_OP_DATA_OUT_INSTR:
+ nfc_op.data_instr = instr;
+ nfc_op.data_instr_idx = op_id;
+ break;
+
+ case NAND_OP_WAITRDY_INSTR:
+ nfc_op.rdy_timeout_ms = instr->ctx.waitrdy.timeout_ms;
+ nfc_op.rdy_delay_ns = instr->delay_ns;
+ break;
+ }
+ }
+
+ instr = nfc_op.data_instr;
+ op_id = nfc_op.data_instr_idx;
+
+ /* Clear interrupts */
+ pl353_smc_clr_nand_int();
+
+ cmdphase_addrflags = ((naddrs << ADDR_CYCLES_SHIFT) |
+ (end_cmd_valid << END_CMD_VALID_SHIFT) |
+ (COMMAND_PHASE) |
+ (nfc_op.cmnds[1] << END_CMD_SHIFT) |
+ (nfc_op.cmnds[0] << START_CMD_SHIFT));
+
+ xnfc->dataphase_addrflags = ((0x0 << CLEAR_CS_SHIFT) |
+ (0 << END_CMD_VALID_SHIFT) |
+ (DATA_PHASE) |
+ (nfc_op.cmnds[0] << END_CMD_SHIFT) |
+ (0x0 << ECC_LAST_SHIFT));
+
+ if (naddrs >= 2) {
+ writel_relaxed(col, xnfc->regs + cmdphase_addrflags);
+ writel_relaxed(row, xnfc->regs + cmdphase_addrflags);
+ } else {
+ writel_relaxed(col, xnfc->regs + cmdphase_addrflags);
+ }
+
+ if (!nfc_op.data_instr) {
+ if (nfc_op.rdy_timeout_ms) {
+ if (pl353_wait_for_dev_ready(chip))
+ return -ETIMEDOUT;
+ }
+ return 0;
+ }
+
+ reading = (nfc_op.data_instr->type == NAND_OP_DATA_IN_INSTR);
+ len = nand_subop_get_data_len(subop, op_id);
+
+ if (!reading) {
+ pl353_nand_write_data_op(chip, instr->ctx.data.buf.out,
+ len, instr->ctx.data.force_8bit);
+ if (nfc_op.rdy_timeout_ms) {
+ if (pl353_wait_for_dev_ready(chip))
+ return -ETIMEDOUT;
+ }
+ ndelay(nfc_op.rdy_delay_ns);
+ } else {
+ ndelay(nfc_op.rdy_delay_ns);
+
+ if (nfc_op.rdy_timeout_ms) {
+ if (pl353_wait_for_dev_ready(chip))
+ return -ETIMEDOUT;
+ }
+
+ pl353_nand_read_data_op(chip, instr->ctx.data.buf.in, len,
+ instr->ctx.data.force_8bit);
+ }
+
+ return 0;
+}
+
+static const struct nand_op_parser pl353_nfc_op_parser = NAND_OP_PARSER(
+ NAND_OP_PARSER_PATTERN(pl353_nand_exec_op_cmd,
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_ADDR_ELEM(true, 7),
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
+ NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, 2048)),
+ NAND_OP_PARSER_PATTERN(pl353_nand_exec_op_cmd,
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_ADDR_ELEM(true, 7),
+ NAND_OP_PARSER_PAT_DATA_OUT_ELEM(true, 2048),
+ NAND_OP_PARSER_PAT_CMD_ELEM(true),
+ NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)),
+ );
+
+static int pl353_nfc_exec_op(struct nand_chip *chip,
+ const struct nand_operation *op,
+ bool check_only)
+{
+ return nand_op_parser_exec_op(chip, &pl353_nfc_op_parser,
+ op, check_only);
+}
+
+/**
+ * pl353_nand_ecc_init - Initialize the ecc information as per the ecc mode
+ * @mtd: Pointer to the mtd_info structure
+ * @ecc: Pointer to ECC control structure
+ * @ecc_mode: ondie ecc status
+ *
+ * This function initializes the ecc block and functional pointers as per the
+ * ecc mode
+ *
+ * Return: 0 on success or negative errno.
+ */
+static int pl353_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc,
+ int ecc_mode)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ int ret = 0;
+
+ ecc->read_oob = pl353_nand_read_oob;
+ ecc->write_oob = pl353_nand_write_oob;
+ ecc->write_page_raw = pl353_nand_write_page_raw;
+ ecc->read_page_raw = pl353_nand_read_page_raw;
+
+ if (ecc_mode == NAND_ECC_ON_DIE) {
+ ecc->write_page = pl353_nand_write_page_raw;
+ ecc->read_page = pl353_nand_read_page_raw;
+
+ /*
+ * On-Die ECC spare bytes offset 8 is used for ECC codes
+ * Use the BBT pattern descriptors
+ */
+ chip->bbt_td = &bbt_main_descr;
+ chip->bbt_md = &bbt_mirror_descr;
+ ret = pl353_smc_set_ecc_mode(PL353_SMC_ECCMODE_BYPASS);
+ if (ret)
+ return ret;
+
+ } else {
+ ecc->mode = NAND_ECC_HW;
+
+ /* Hardware ECC generates 3 bytes ECC code for each 512 bytes */
+ ecc->bytes = 3;
+ ecc->strength = 1;
+ ecc->calculate = pl353_nand_calculate_hwecc;
+ ecc->correct = pl353_nand_correct_data;
+ ecc->read_page = pl353_nand_read_page_hwecc;
+ ecc->size = PL353_NAND_ECC_SIZE;
+ ecc->read_page = pl353_nand_read_page_hwecc;
+ ecc->write_page = pl353_nand_write_page_hwecc;
+ pl353_smc_set_ecc_pg_size(mtd->writesize);
+ switch (mtd->writesize) {
+ case SZ_512:
+ case SZ_1K:
+ case SZ_2K:
+ pl353_smc_set_ecc_mode(PL353_SMC_ECCMODE_APB);
+ break;
+ default:
+ ecc->calculate = nand_calculate_ecc;
+ ecc->correct = nand_correct_data;
+ ecc->size = 256;
+ break;
+ }
+
+ if (mtd->oobsize == 16) {
+ mtd_set_ooblayout(mtd, &pl353_ecc_ooblayout16_ops);
+ } else if (mtd->oobsize == 64) {
+ mtd_set_ooblayout(mtd, &pl353_ecc_ooblayout64_ops);
+ } else {
+ dev_err(xnfc->dev, "Unsupported oob Layout\n");
+ ret = -ENXIO;
+ }
+ }
+
+ return ret;
+}
+
+static int pl353_nfc_setup_data_interface(struct nand_chip *chip, int csline,
+ const struct nand_data_interface
+ *conf)
+{
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ const struct nand_sdr_timings *sdr;
+ u32 timings[7], mckperiodps;
+
+ if (csline == NAND_DATA_IFACE_CHECK_ONLY)
+ return 0;
+
+ sdr = nand_get_sdr_timings(conf);
+ if (IS_ERR(sdr))
+ return PTR_ERR(sdr);
+
+ /*
+ * SDR timings are given in pico-seconds while NFC timings must be
+ * expressed in NAND controller clock cycles.
+ */
+ mckperiodps = NSEC_PER_SEC / xnfc->mclk_rate;
+ mckperiodps *= 1000;
+
+ if (sdr->tRC_min <= 20000)
+ /*
+ * PL353 SMC needs one extra read cycle in SDR Mode 5
+ * This is not written anywhere in the datasheet but
+ * the results observed during testing.
+ */
+ timings[0] = DIV_ROUND_UP(sdr->tRC_min, mckperiodps) + 1;
+ else
+ timings[0] = DIV_ROUND_UP(sdr->tRC_min, mckperiodps);
+
+ timings[1] = DIV_ROUND_UP(sdr->tWC_min, mckperiodps);
+
+ /*
+ * For all SDR modes, PL353 SMC needs tREA max value as 1,
+ * Results observed during testing.
+ */
+ timings[2] = PL353_TREA_MAX_VALUE;
+ timings[3] = DIV_ROUND_UP(sdr->tWP_min, mckperiodps);
+ timings[4] = DIV_ROUND_UP(sdr->tCLR_min, mckperiodps);
+ timings[5] = DIV_ROUND_UP(sdr->tAR_min, mckperiodps);
+ timings[6] = DIV_ROUND_UP(sdr->tRR_min, mckperiodps);
+ pl353_smc_set_cycles(timings);
+
+ return 0;
+}
+
+static int pl353_nand_attach_chip(struct nand_chip *chip)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct pl353_nand_controller *xnfc = to_pl353_nand(chip);
+ int ret;
+
+ if (chip->options & NAND_BUSWIDTH_16) {
+ ret = pl353_smc_set_buswidth(PL353_SMC_MEM_WIDTH_16);
+ if (ret) {
+ dev_err(xnfc->dev, "Set BusWidth failed\n");
+ return ret;
+ }
+ }
+
+ if (mtd->writesize <= SZ_512)
+ xnfc->addr_cycles = 1;
+ else
+ xnfc->addr_cycles = 2;
+
+ if (chip->options & NAND_ROW_ADDR_3)
+ xnfc->addr_cycles += 3;
+ else
+ xnfc->addr_cycles += 2;
+
+ ret = pl353_nand_ecc_init(mtd, &chip->ecc, chip->ecc.mode);
+ if (ret) {
+ dev_err(xnfc->dev, "ECC init failed\n");
+ return ret;
+ }
+
+ if (!mtd->name) {
+ /*
+ * If the new bindings are used and the bootloader has not been
+ * updated to pass a new mtdparts parameter on the cmdline, you
+ * should define the following property in your NAND node, ie:
+ *
+ * label = "pl353-nand";
+ *
+ * This way, mtd->name will be set by the core when
+ * nand_set_flash_node() is called.
+ */
+ mtd->name = devm_kasprintf(xnfc->dev, GFP_KERNEL,
+ "%s", PL353_NAND_DRIVER_NAME);
+ if (!mtd->name) {
+ dev_err(xnfc->dev, "Failed to allocate mtd->name\n");
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+static const struct nand_controller_ops pl353_nand_controller_ops = {
+ .attach_chip = pl353_nand_attach_chip,
+ .exec_op = pl353_nfc_exec_op,
+ .setup_data_interface = pl353_nfc_setup_data_interface,
+};
+
+/**
+ * pl353_nand_probe - Probe method for the NAND driver
+ * @pdev: Pointer to the platform_device structure
+ *
+ * This function initializes the driver data structures and the hardware.
+ * The NAND driver has dependency with the pl353_smc memory controller
+ * driver for initializing the NAND timing parameters, bus width, ECC modes,
+ * control and status information.
+ *
+ * Return: 0 on success or error value on failure
+ */
+static int pl353_nand_probe(struct platform_device *pdev)
+{
+ struct pl353_nand_controller *xnfc;
+ struct mtd_info *mtd;
+ struct nand_chip *chip;
+ struct resource *res;
+ struct device_node *np, *dn;
+ struct clk *mclk;
+ u32 ret, val;
+
+ xnfc = devm_kzalloc(&pdev->dev, sizeof(*xnfc), GFP_KERNEL);
+ if (!xnfc)
+ return -ENOMEM;
+
+ xnfc->dev = &pdev->dev;
+ nand_controller_init(&xnfc->controller);
+ xnfc->controller.ops = &pl353_nand_controller_ops;
+
+ /* Map physical address of NAND flash */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ xnfc->regs = devm_ioremap_resource(xnfc->dev, res);
+ if (IS_ERR(xnfc->regs))
+ return PTR_ERR(xnfc->regs);
+
+ chip = &xnfc->chip;
+ chip->controller = &xnfc->controller;
+ mtd = nand_to_mtd(chip);
+ nand_set_controller_data(chip, xnfc);
+ mtd->priv = chip;
+ mtd->owner = THIS_MODULE;
+ nand_set_flash_node(chip, xnfc->dev->of_node);
+
+ np = of_get_next_parent(xnfc->dev->of_node);
+ mclk = of_clk_get_by_name(np, "memclk");
+ if (IS_ERR(mclk)) {
+ dev_err(xnfc->dev, "Failed to retrieve MCK clk\n");
+ return PTR_ERR(mclk);
+ }
+
+ xnfc->mclk_rate = clk_get_rate(mclk);
+ dn = nand_get_flash_node(chip);
+ ret = of_property_read_u32(dn, "nand-bus-width", &val);
+ if (ret)
+ val = 8;
+
+ xnfc->buswidth = val;
+
+ /* Set the device option and flash width */
+ chip->options = NAND_BUSWIDTH_AUTO;
+ chip->bbt_options = NAND_BBT_USE_FLASH;
+ platform_set_drvdata(pdev, xnfc);
+ ret = nand_scan(chip, 1);
+ if (ret) {
+ dev_err(xnfc->dev, "could not scan the nand chip\n");
+ return ret;
+ }
+
+ ret = mtd_device_register(mtd, NULL, 0);
+ if (ret) {
+ dev_err(xnfc->dev, "Failed to register mtd device: %d\n", ret);
+ nand_cleanup(chip);
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * pl353_nand_remove - Remove method for the NAND driver
+ * @pdev: Pointer to the platform_device structure
+ *
+ * This function is called if the driver module is being unloaded. It frees all
+ * resources allocated to the device.
+ *
+ * Return: 0 on success or error value on failure
+ */
+static int pl353_nand_remove(struct platform_device *pdev)
+{
+ struct pl353_nand_controller *xnfc = platform_get_drvdata(pdev);
+ struct mtd_info *mtd = nand_to_mtd(&xnfc->chip);
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ /* Release resources, unregister device */
+ nand_release(chip);
+
+ return 0;
+}
+
+/* Match table for device tree binding */
+static const struct of_device_id pl353_nand_of_match[] = {
+ { .compatible = "arm,pl353-nand-r2p1" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, pl353_nand_of_match);
+
+/*
+ * pl353_nand_driver - This structure defines the NAND subsystem platform driver
+ */
+static struct platform_driver pl353_nand_driver = {
+ .probe = pl353_nand_probe,
+ .remove = pl353_nand_remove,
+ .driver = {
+ .name = PL353_NAND_DRIVER_NAME,
+ .of_match_table = pl353_nand_of_match,
+ },
+};
+
+module_platform_driver(pl353_nand_driver);
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_ALIAS("platform:" PL353_NAND_DRIVER_NAME);
+MODULE_DESCRIPTION("ARM PL353 NAND Flash Driver");
+MODULE_LICENSE("GPL");