mtd: rawnand: Meson NAND controller support
Basic support for Amlogic Meson NAND controller on AXG. This version
works at only first EDO mode.
Based on Linux version 6.7.0-rc4.
Link: https://lore.kernel.org/all/20240210223927.570043-1-avkrasnov@salutedevices.com
Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index bb9994b..24809ac 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -504,6 +504,15 @@
controller. This uses the hardware ECC for read and
write operations.
+config NAND_MESON
+ bool "Meson NAND support"
+ select SYS_NAND_SELF_INIT
+ depends on DM_MTD && ARCH_MESON
+ imply CMD_NAND
+ help
+ This enables Nand driver support for Meson raw NAND flash
+ controller.
+
config NAND_MXC
bool "MXC NAND support"
depends on CPU_ARM926EJS || CPU_ARM1136 || MX5
diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
index ddbba89..46fead6 100644
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -61,6 +61,7 @@
obj-$(CONFIG_NAND_LPC32XX_MLC) += lpc32xx_nand_mlc.o
obj-$(CONFIG_NAND_LPC32XX_SLC) += lpc32xx_nand_slc.o
obj-$(CONFIG_NAND_VF610_NFC) += vf610_nfc.o
+obj-$(CONFIG_NAND_MESON) += meson_nand.o
obj-$(CONFIG_NAND_MXC) += mxc_nand.o
obj-$(CONFIG_NAND_MXS) += mxs_nand.o
obj-$(CONFIG_NAND_MXS_DT) += mxs_nand_dt.o
diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
new file mode 100644
index 0000000..5d411c4
--- /dev/null
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -0,0 +1,1248 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Amlogic Meson Nand Flash Controller Driver
+ *
+ * Copyright (c) 2018 Amlogic, inc.
+ * Author: Liang Yang <liang.yang@amlogic.com>
+ *
+ * Copyright (c) 2023 SaluteDevices, Inc.
+ * Author: Arseniy Krasnov <avkrasnov@salutedevices.com>
+ */
+
+#include <common.h>
+#include <nand.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <dm/ofnode.h>
+#include <dm/uclass.h>
+#include <linux/bug.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/iopoll.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/sizes.h>
+
+#define NFC_CMD_IDLE (0xc << 14)
+#define NFC_CMD_CLE (0x5 << 14)
+#define NFC_CMD_ALE (0x6 << 14)
+#define NFC_CMD_DWR (0x4 << 14)
+#define NFC_CMD_DRD (0x8 << 14)
+#define NFC_CMD_ADL ((0 << 16) | (3 << 20))
+#define NFC_CMD_ADH ((1 << 16) | (3 << 20))
+#define NFC_CMD_AIL ((2 << 16) | (3 << 20))
+#define NFC_CMD_AIH ((3 << 16) | (3 << 20))
+#define NFC_CMD_SEED ((8 << 16) | (3 << 20))
+#define NFC_CMD_M2N ((0 << 17) | (2 << 20))
+#define NFC_CMD_N2M ((1 << 17) | (2 << 20))
+#define NFC_CMD_RB BIT(20)
+#define NFC_CMD_SCRAMBLER_ENABLE BIT(19)
+#define NFC_CMD_SCRAMBLER_DISABLE 0
+#define NFC_CMD_SHORTMODE_DISABLE 0
+#define NFC_CMD_RB_INT BIT(14)
+#define NFC_CMD_RB_INT_NO_PIN ((0xb << 10) | BIT(18) | BIT(16))
+
+#define NFC_CMD_GET_SIZE(x) (((x) >> 22) & GENMASK(4, 0))
+
+#define NFC_REG_CMD 0x00
+#define NFC_REG_CFG 0x04
+#define NFC_REG_DADR 0x08
+#define NFC_REG_IADR 0x0c
+#define NFC_REG_BUF 0x10
+#define NFC_REG_INFO 0x14
+#define NFC_REG_DC 0x18
+#define NFC_REG_ADR 0x1c
+#define NFC_REG_DL 0x20
+#define NFC_REG_DH 0x24
+#define NFC_REG_CADR 0x28
+#define NFC_REG_SADR 0x2c
+#define NFC_REG_PINS 0x30
+#define NFC_REG_VER 0x38
+
+#define CMDRWGEN(cmd_dir, ran, bch, short_mode, page_size, pages) \
+ ( \
+ (cmd_dir) | \
+ (ran) | \
+ ((bch) << 14) | \
+ ((short_mode) << 13) | \
+ (((page_size) & 0x7f) << 6) | \
+ ((pages) & 0x3f) \
+ )
+
+#define GENCMDDADDRL(adl, addr) ((adl) | ((addr) & 0xffff))
+#define GENCMDDADDRH(adh, addr) ((adh) | (((addr) >> 16) & 0xffff))
+#define GENCMDIADDRL(ail, addr) ((ail) | ((addr) & 0xffff))
+#define GENCMDIADDRH(aih, addr) ((aih) | (((addr) >> 16) & 0xffff))
+
+#define DMA_DIR(dir) ((dir) ? NFC_CMD_N2M : NFC_CMD_M2N)
+
+#define ECC_CHECK_RETURN_FF -1
+
+#define NAND_CE0 (0xe << 10)
+#define NAND_CE1 (0xd << 10)
+
+#define DMA_BUSY_TIMEOUT_US 1000000
+#define CMD_DRAIN_TIMEOUT_US 1000
+#define ECC_POLL_TIMEOUT_US 15
+
+#define MAX_CE_NUM 2
+
+/* eMMC clock register, misc control */
+#define CLK_SELECT_NAND BIT(31)
+#define CLK_ALWAYS_ON_NAND BIT(24)
+#define CLK_ENABLE_VALUE 0x245
+
+#define DIRREAD 1
+#define DIRWRITE 0
+
+#define ECC_PARITY_BCH8_512B 14
+#define ECC_COMPLETE BIT(31)
+#define ECC_ERR_CNT(x) (((x) >> 24) & GENMASK(5, 0))
+#define ECC_ZERO_CNT(x) (((x) >> 16) & GENMASK(5, 0))
+#define ECC_UNCORRECTABLE 0x3f
+
+#define PER_INFO_BYTE 8
+
+#define NFC_SEND_CMD(host, cmd) \
+ (writel((cmd), (host)->reg_base + NFC_REG_CMD))
+
+#define NFC_GET_CMD(host) \
+ (readl((host)->reg_base + NFC_REG_CMD))
+
+#define NFC_CMDFIFO_SIZE(host) ((NFC_GET_CMD((host)) >> 22) & GENMASK(4, 0))
+
+#define NFC_CMD_MAKE_IDLE(ce, delay) ((ce) | NFC_CMD_IDLE | ((delay) & 0x3ff))
+#define NFC_CMD_MAKE_DRD(ce, size) ((ce) | NFC_CMD_DRD | (size))
+#define NFC_CMD_MAKE_DWR(ce, data) ((ce) | NFC_CMD_DWR | ((data) & 0xff))
+#define NFC_CMD_MAKE_CLE(ce, cmd_val) ((ce) | NFC_CMD_CLE | ((cmd_val) & 0xff))
+#define NFC_CMD_MAKE_ALE(ce, addr) ((ce) | NFC_CMD_ALE | ((addr) & 0xff))
+
+#define NAND_TWB_TIME_CYCLE 10
+
+#define NFC_DEV_READY_TICK_MAX 5000
+
+/* Both values are recommended by vendor, as the most
+ * tested with almost all SLC NAND flash. Second value
+ * could be calculated dynamically from timing parameters,
+ * but we need both values for initial start of the NAND
+ * controller (e.g. before NAND subsystem processes timings),
+ * so use hardcoded constants.
+ */
+#define NFC_DEFAULT_BUS_CYCLE 6
+#define NFC_DEFAULT_BUS_TIMING 7
+
+#define NFC_SEED_OFFSET 0xc2
+#define NFC_SEED_MASK 0x7fff
+
+#define DMA_ADDR_ALIGN 8
+
+struct meson_nfc_nand_chip {
+ struct list_head node;
+ struct nand_chip nand;
+
+ u32 bch_mode;
+ u8 *data_buf;
+ __le64 *info_buf;
+ u32 nsels;
+ u8 sels[];
+};
+
+struct meson_nfc_param {
+ u32 chip_select;
+ u32 rb_select;
+};
+
+struct meson_nfc {
+ void __iomem *reg_base;
+ void __iomem *reg_clk;
+ struct list_head chips;
+ struct meson_nfc_param param;
+ struct udevice *dev;
+ dma_addr_t daddr;
+ dma_addr_t iaddr;
+ u32 data_bytes;
+ u32 info_bytes;
+ u64 assigned_cs;
+};
+
+struct meson_nand_ecc {
+ u32 bch;
+ u32 strength;
+ u32 size;
+};
+
+enum {
+ NFC_ECC_BCH8_512 = 1,
+ NFC_ECC_BCH8_1K,
+ NFC_ECC_BCH24_1K,
+ NFC_ECC_BCH30_1K,
+ NFC_ECC_BCH40_1K,
+ NFC_ECC_BCH50_1K,
+ NFC_ECC_BCH60_1K,
+};
+
+#define MESON_ECC_DATA(b, s, sz) { .bch = (b), .strength = (s), .size = (sz) }
+
+static struct meson_nand_ecc meson_ecc[] = {
+ MESON_ECC_DATA(NFC_ECC_BCH8_512, 8, 512),
+ MESON_ECC_DATA(NFC_ECC_BCH8_1K, 8, 1024),
+};
+
+static int meson_nand_calc_ecc_bytes(int step_size, int strength)
+{
+ int ecc_bytes;
+
+ if (step_size == 512 && strength == 8)
+ return ECC_PARITY_BCH8_512B;
+
+ ecc_bytes = DIV_ROUND_UP(strength * fls(step_size * 8), 8);
+ ecc_bytes = ALIGN(ecc_bytes, 2);
+
+ return ecc_bytes;
+}
+
+static struct meson_nfc_nand_chip *to_meson_nand(struct nand_chip *nand)
+{
+ return container_of(nand, struct meson_nfc_nand_chip, nand);
+}
+
+static void meson_nfc_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+
+ nfc->param.chip_select = meson_chip->sels[chip] ? NAND_CE1 : NAND_CE0;
+}
+
+static void meson_nfc_cmd_idle(struct meson_nfc *nfc, u32 time)
+{
+ writel(NFC_CMD_MAKE_IDLE(nfc->param.chip_select, time),
+ nfc->reg_base + NFC_REG_CMD);
+}
+
+static void meson_nfc_cmd_seed(const struct meson_nfc *nfc, u32 seed)
+{
+ writel(NFC_CMD_SEED | (NFC_SEED_OFFSET + (seed & NFC_SEED_MASK)),
+ nfc->reg_base + NFC_REG_CMD);
+}
+
+static void meson_nfc_cmd_access(struct nand_chip *nand, bool raw, bool dir,
+ int scrambler)
+{
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ const struct meson_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd));
+ const struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ u32 bch = meson_chip->bch_mode, cmd;
+ int len = mtd->writesize, pagesize, pages;
+
+ pagesize = nand->ecc.size;
+
+ if (raw) {
+ len = mtd->writesize + mtd->oobsize;
+ cmd = len | scrambler | DMA_DIR(dir);
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+ return;
+ }
+
+ pages = len / nand->ecc.size;
+
+ cmd = CMDRWGEN(DMA_DIR(dir), scrambler, bch,
+ NFC_CMD_SHORTMODE_DISABLE, pagesize, pages);
+
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+}
+
+static void meson_nfc_drain_cmd(struct meson_nfc *nfc)
+{
+ /*
+ * Insert two commands to make sure all valid commands are finished.
+ *
+ * The Nand flash controller is designed as two stages pipleline -
+ * a) fetch and b) execute.
+ * There might be cases when the driver see command queue is empty,
+ * but the Nand flash controller still has two commands buffered,
+ * one is fetched into NFC request queue (ready to run), and another
+ * is actively executing. So pushing 2 "IDLE" commands guarantees that
+ * the pipeline is emptied.
+ */
+ meson_nfc_cmd_idle(nfc, 0);
+ meson_nfc_cmd_idle(nfc, 0);
+}
+
+static int meson_nfc_wait_cmd_finish(const struct meson_nfc *nfc,
+ unsigned int timeout_us)
+{
+ u32 cmd_size = 0;
+
+ /* wait cmd fifo is empty */
+ return readl_relaxed_poll_timeout(nfc->reg_base + NFC_REG_CMD, cmd_size,
+ !NFC_CMD_GET_SIZE(cmd_size),
+ timeout_us);
+}
+
+static int meson_nfc_wait_dma_finish(struct meson_nfc *nfc)
+{
+ meson_nfc_drain_cmd(nfc);
+
+ return meson_nfc_wait_cmd_finish(nfc, DMA_BUSY_TIMEOUT_US);
+}
+
+static u8 *meson_nfc_oob_ptr(struct nand_chip *nand, int i)
+{
+ const struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ int len;
+
+ len = nand->ecc.size * (i + 1) + (nand->ecc.bytes + 2) * i;
+
+ return meson_chip->data_buf + len;
+}
+
+static u8 *meson_nfc_data_ptr(struct nand_chip *nand, int i)
+{
+ const struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ int len, temp;
+
+ temp = nand->ecc.size + nand->ecc.bytes;
+ len = (temp + 2) * i;
+
+ return meson_chip->data_buf + len;
+}
+
+static void meson_nfc_get_data_oob(struct nand_chip *nand,
+ u8 *buf, u8 *oobbuf)
+{
+ u8 *dsrc, *osrc;
+ int i, oob_len;
+
+ oob_len = nand->ecc.bytes + 2;
+ for (i = 0; i < nand->ecc.steps; i++) {
+ if (buf) {
+ dsrc = meson_nfc_data_ptr(nand, i);
+ memcpy(buf, dsrc, nand->ecc.size);
+ buf += nand->ecc.size;
+ }
+
+ if (oobbuf) {
+ osrc = meson_nfc_oob_ptr(nand, i);
+ memcpy(oobbuf, osrc, oob_len);
+ oobbuf += oob_len;
+ }
+ }
+}
+
+static void meson_nfc_set_data_oob(struct nand_chip *nand,
+ const u8 *buf, u8 *oobbuf)
+{
+ int i, oob_len;
+
+ oob_len = nand->ecc.bytes + 2;
+ for (i = 0; i < nand->ecc.steps; i++) {
+ u8 *osrc;
+
+ if (buf) {
+ u8 *dsrc;
+
+ dsrc = meson_nfc_data_ptr(nand, i);
+ memcpy(dsrc, buf, nand->ecc.size);
+ buf += nand->ecc.size;
+ }
+
+ osrc = meson_nfc_oob_ptr(nand, i);
+ memcpy(osrc, oobbuf, oob_len);
+ oobbuf += oob_len;
+ }
+}
+
+static void meson_nfc_set_user_byte(struct nand_chip *nand, const u8 *oob_buf)
+{
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ int i, count;
+
+ for (i = 0, count = 0; i < nand->ecc.steps; i++, count += (2 + nand->ecc.bytes)) {
+ __le64 *info = &meson_chip->info_buf[i];
+
+ *info |= oob_buf[count];
+ *info |= oob_buf[count + 1] << 8;
+ }
+}
+
+static void meson_nfc_get_user_byte(struct nand_chip *nand, u8 *oob_buf)
+{
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ int i, count;
+
+ for (i = 0, count = 0; i < nand->ecc.steps; i++, count += (2 + nand->ecc.bytes)) {
+ const __le64 *info = &meson_chip->info_buf[i];
+
+ oob_buf[count] = *info;
+ oob_buf[count + 1] = *info >> 8;
+ }
+}
+
+static int meson_nfc_ecc_correct(struct nand_chip *nand, u32 *bitflips,
+ u64 *correct_bitmap)
+{
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ int ret = 0, i;
+
+ for (i = 0; i < nand->ecc.steps; i++) {
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ const __le64 *info = &meson_chip->info_buf[i];
+
+ if (ECC_ERR_CNT(*info) != ECC_UNCORRECTABLE) {
+ mtd->ecc_stats.corrected += ECC_ERR_CNT(*info);
+ *bitflips = max_t(u32, *bitflips, ECC_ERR_CNT(*info));
+ *correct_bitmap |= BIT_ULL(i);
+ continue;
+ }
+
+ if ((nand->options & NAND_NEED_SCRAMBLING) &&
+ ECC_ZERO_CNT(*info) < nand->ecc.strength) {
+ mtd->ecc_stats.corrected += ECC_ZERO_CNT(*info);
+ *bitflips = max_t(u32, *bitflips,
+ ECC_ZERO_CNT(*info));
+ ret = ECC_CHECK_RETURN_FF;
+ } else {
+ ret = -EBADMSG;
+ }
+ }
+
+ return ret;
+}
+
+static int meson_nfc_dma_buffer_setup(struct nand_chip *nand, void *databuf,
+ int datalen, void *infobuf, int infolen,
+ enum dma_data_direction dir)
+{
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+ int ret;
+ u32 cmd;
+
+ nfc->daddr = dma_map_single(databuf, datalen, DMA_BIDIRECTIONAL);
+ ret = dma_mapping_error(nfc->dev, nfc->daddr);
+ if (ret)
+ return ret;
+
+ cmd = GENCMDDADDRL(NFC_CMD_ADL, nfc->daddr);
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+
+ cmd = GENCMDDADDRH(NFC_CMD_ADH, nfc->daddr);
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+
+ if (infobuf) {
+ nfc->iaddr = dma_map_single(infobuf, infolen,
+ DMA_BIDIRECTIONAL);
+ ret = dma_mapping_error(nfc->dev, nfc->iaddr);
+ if (ret) {
+ dma_unmap_single(nfc->daddr, datalen, dir);
+ return ret;
+ }
+
+ nfc->info_bytes = infolen;
+ cmd = GENCMDIADDRL(NFC_CMD_AIL, nfc->iaddr);
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+
+ cmd = GENCMDIADDRH(NFC_CMD_AIH, nfc->iaddr);
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+ }
+
+ return 0;
+}
+
+static void meson_nfc_dma_buffer_release(struct nand_chip *nand,
+ int datalen, int infolen,
+ enum dma_data_direction dir)
+{
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+
+ dma_unmap_single(nfc->daddr, datalen, dir);
+
+ if (infolen) {
+ dma_unmap_single(nfc->iaddr, infolen, dir);
+ nfc->info_bytes = 0;
+ }
+}
+
+static void meson_nfc_read_buf(struct mtd_info *mtd, u8 *buf, int size)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ u8 *dma_buf;
+ int ret;
+ u32 cmd;
+
+ if ((uintptr_t)buf % DMA_ADDR_ALIGN) {
+ unsigned long tmp_addr;
+
+ dma_buf = dma_alloc_coherent(size, &tmp_addr);
+ if (!dma_buf)
+ return;
+ } else {
+ dma_buf = buf;
+ }
+
+ ret = meson_nfc_dma_buffer_setup(nand, dma_buf, size, meson_chip->info_buf,
+ PER_INFO_BYTE, DMA_FROM_DEVICE);
+ if (ret) {
+ pr_err("Failed to setup DMA buffer %p/%p\n", dma_buf,
+ meson_chip->info_buf);
+ return;
+ }
+
+ cmd = NFC_CMD_N2M | size;
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+
+ meson_nfc_drain_cmd(nfc);
+ meson_nfc_wait_cmd_finish(nfc, CMD_DRAIN_TIMEOUT_US);
+ meson_nfc_dma_buffer_release(nand, size, PER_INFO_BYTE, DMA_FROM_DEVICE);
+
+ if (buf != dma_buf) {
+ memcpy(buf, dma_buf, size);
+ dma_free_coherent(dma_buf);
+ }
+}
+
+static void meson_nfc_write_buf(struct mtd_info *mtd, const u8 *buf, int size)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+ u8 *dma_buf;
+ int ret;
+ u32 cmd;
+
+ if ((uintptr_t)buf % DMA_ADDR_ALIGN) {
+ unsigned long tmp_addr;
+
+ dma_buf = dma_alloc_coherent(size, &tmp_addr);
+ if (!dma_buf)
+ return;
+
+ memcpy(dma_buf, buf, size);
+ } else {
+ dma_buf = (u8 *)buf;
+ }
+
+ ret = meson_nfc_dma_buffer_setup(nand, (void *)dma_buf, size, NULL,
+ 0, DMA_TO_DEVICE);
+ if (ret) {
+ pr_err("Failed to setup DMA buffer %p\n", dma_buf);
+ return;
+ }
+
+ cmd = NFC_CMD_M2N | size;
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+
+ meson_nfc_drain_cmd(nfc);
+ meson_nfc_wait_cmd_finish(nfc, CMD_DRAIN_TIMEOUT_US);
+ meson_nfc_dma_buffer_release(nand, size, 0, DMA_TO_DEVICE);
+
+ if (buf != dma_buf)
+ dma_free_coherent(dma_buf);
+}
+
+static int meson_nfc_write_page_sub(struct nand_chip *nand,
+ int page, bool raw)
+{
+ const struct mtd_info *mtd = nand_to_mtd(nand);
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+ int data_len, info_len;
+ int ret;
+ u32 cmd;
+
+ data_len = mtd->writesize + mtd->oobsize;
+ info_len = nand->ecc.steps * PER_INFO_BYTE;
+
+ ret = meson_nfc_dma_buffer_setup(nand, meson_chip->data_buf,
+ data_len, meson_chip->info_buf,
+ info_len, DMA_TO_DEVICE);
+ if (ret) {
+ pr_err("Failed to setup DMA buffer %p/%p\n",
+ meson_chip->data_buf, meson_chip->info_buf);
+ return ret;
+ }
+
+ if (nand->options & NAND_NEED_SCRAMBLING) {
+ meson_nfc_cmd_seed(nfc, page);
+ meson_nfc_cmd_access(nand, raw, DIRWRITE,
+ NFC_CMD_SCRAMBLER_ENABLE);
+ } else {
+ meson_nfc_cmd_access(nand, raw, DIRWRITE,
+ NFC_CMD_SCRAMBLER_DISABLE);
+ }
+
+ cmd = nfc->param.chip_select | NFC_CMD_CLE | NAND_CMD_PAGEPROG;
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+
+ meson_nfc_dma_buffer_release(nand, data_len, info_len, DMA_TO_DEVICE);
+
+ return 0;
+}
+
+static int meson_nfc_write_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ const u8 *buf, int oob_required, int page)
+{
+ meson_nfc_set_data_oob(chip, buf, oob_required ? chip->oob_poi : NULL);
+
+ return meson_nfc_write_page_sub(chip, page, true);
+}
+
+static int meson_nfc_write_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
+ const u8 *buf, int oob_required, int page)
+{
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(chip);
+
+ if (buf)
+ memcpy(meson_chip->data_buf, buf, mtd->writesize);
+
+ memset(meson_chip->info_buf, 0, chip->ecc.steps * PER_INFO_BYTE);
+
+ if (oob_required)
+ meson_nfc_set_user_byte(chip, chip->oob_poi);
+
+ return meson_nfc_write_page_sub(chip, page, false);
+}
+
+static void meson_nfc_check_ecc_pages_valid(struct meson_nfc *nfc,
+ struct nand_chip *nand, bool raw)
+{
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ __le64 *info;
+ u32 neccpages;
+ int ret;
+
+ neccpages = raw ? 1 : nand->ecc.steps;
+ info = &meson_chip->info_buf[neccpages - 1];
+ do {
+ udelay(ECC_POLL_TIMEOUT_US);
+ /* info is updated by nfc dma engine*/
+ rmb();
+ invalidate_dcache_range(nfc->iaddr, nfc->iaddr + nfc->info_bytes);
+ ret = *info & ECC_COMPLETE;
+ } while (!ret);
+}
+
+static int meson_nfc_read_page_sub(struct nand_chip *nand,
+ int page, bool raw)
+{
+ struct mtd_info *mtd = nand_to_mtd(nand);
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ u32 data_len, info_len;
+ int ret;
+
+ data_len = mtd->writesize + mtd->oobsize;
+ info_len = nand->ecc.steps * PER_INFO_BYTE;
+
+ ret = meson_nfc_dma_buffer_setup(nand, meson_chip->data_buf, data_len,
+ meson_chip->info_buf, info_len,
+ DMA_FROM_DEVICE);
+ if (ret)
+ return ret;
+
+ if (nand->options & NAND_NEED_SCRAMBLING) {
+ meson_nfc_cmd_seed(nfc, page);
+ meson_nfc_cmd_access(nand, raw, DIRREAD,
+ NFC_CMD_SCRAMBLER_ENABLE);
+ } else {
+ meson_nfc_cmd_access(nand, raw, DIRREAD,
+ NFC_CMD_SCRAMBLER_DISABLE);
+ }
+
+ meson_nfc_wait_dma_finish(nfc);
+ meson_nfc_check_ecc_pages_valid(nfc, nand, raw);
+
+ meson_nfc_dma_buffer_release(nand, data_len, info_len,
+ DMA_FROM_DEVICE);
+
+ return 0;
+}
+
+static int meson_nfc_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ u8 *buf, int oob_required, int page)
+{
+ int ret;
+
+ ret = meson_nfc_read_page_sub(chip, page, true);
+ if (ret)
+ return ret;
+
+ meson_nfc_get_data_oob(chip, buf, oob_required ? chip->oob_poi : NULL);
+
+ return 0;
+}
+
+static int meson_nfc_read_page_hwecc(struct mtd_info *mtd, struct nand_chip *chip,
+ u8 *buf, int oob_required, int page)
+{
+ const struct meson_nfc_nand_chip *meson_chip = to_meson_nand(chip);
+ u64 correct_bitmap = 0;
+ u32 bitflips = 0;
+ int ret;
+
+ ret = meson_nfc_read_page_sub(chip, page, false);
+ if (ret)
+ return ret;
+
+ if (oob_required)
+ meson_nfc_get_user_byte(chip, chip->oob_poi);
+
+ ret = meson_nfc_ecc_correct(chip, &bitflips, &correct_bitmap);
+
+ if (ret == ECC_CHECK_RETURN_FF) {
+ if (buf)
+ memset(buf, 0xff, mtd->writesize);
+
+ if (oob_required)
+ memset(chip->oob_poi, 0xff, mtd->oobsize);
+ } else if (ret < 0) {
+ struct nand_ecc_ctrl *ecc;
+ int i;
+
+ if ((chip->options & NAND_NEED_SCRAMBLING) || !buf) {
+ mtd->ecc_stats.failed++;
+ return bitflips;
+ }
+
+ chip->cmdfunc(mtd, NAND_CMD_READ0, 0, page);
+
+ ret = meson_nfc_read_page_raw(mtd, chip, buf, 1, page);
+ if (ret)
+ return ret;
+
+ ecc = &chip->ecc;
+
+ for (i = 0; i < chip->ecc.steps ; i++) {
+ u8 *data = buf + i * ecc->size;
+ u8 *oob = chip->oob_poi + i * (ecc->bytes + 2);
+
+ if (correct_bitmap & BIT_ULL(i))
+ continue;
+
+ ret = nand_check_erased_ecc_chunk(data, ecc->size,
+ oob, ecc->bytes + 2,
+ NULL, 0,
+ ecc->strength);
+ if (ret < 0) {
+ mtd->ecc_stats.failed++;
+ } else {
+ mtd->ecc_stats.corrected += ret;
+ bitflips = max_t(u32, bitflips, ret);
+ }
+ }
+ } else if (buf && buf != meson_chip->data_buf) {
+ memcpy(buf, meson_chip->data_buf, mtd->writesize);
+ }
+
+ return bitflips;
+}
+
+static int meson_nfc_read_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ int ret;
+
+ ret = nand_read_page_op(chip, page, 0, NULL, 0);
+ if (ret)
+ return ret;
+
+ return meson_nfc_read_page_raw(mtd, chip, NULL, 1, page);
+}
+
+static int meson_nfc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ int ret;
+
+ ret = nand_read_page_op(chip, page, 0, NULL, 0);
+ if (ret)
+ return ret;
+
+ return meson_nfc_read_page_hwecc(mtd, chip, NULL, 1, page);
+}
+
+static int meson_nfc_write_oob_raw(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ int ret;
+
+ ret = nand_prog_page_begin_op(chip, page, 0, NULL, 0);
+ if (ret)
+ return ret;
+
+ ret = meson_nfc_write_page_raw(mtd, chip, NULL, 1, page);
+ if (ret)
+ return ret;
+
+ return nand_prog_page_end_op(chip);
+}
+
+static int meson_nfc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
+ int page)
+{
+ int ret;
+
+ ret = nand_prog_page_begin_op(chip, page, 0, NULL, 0);
+ if (ret)
+ return ret;
+
+ ret = meson_nfc_write_page_hwecc(mtd, chip, NULL, 1, page);
+ if (ret)
+ return ret;
+
+ return nand_prog_page_end_op(chip);
+}
+
+static void meson_nfc_nand_cmd_function(struct mtd_info *mtd, unsigned int command,
+ int column, int page_addr)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ chip->cmd_ctrl(mtd, command, NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
+
+ if (column != -1 || page_addr != -1) {
+ int ctrl = NAND_CTRL_CHANGE | NAND_NCE | NAND_ALE;
+
+ /* Serially input address */
+ if (column != -1) {
+ /* Adjust columns for 16 bit buswidth */
+ if (chip->options & NAND_BUSWIDTH_16 &&
+ !nand_opcode_8bits(command))
+ column >>= 1;
+
+ chip->cmd_ctrl(mtd, column, ctrl);
+ ctrl &= ~NAND_CTRL_CHANGE;
+ /* Only output a single addr cycle for 8bits
+ * opcodes.
+ */
+ if (!nand_opcode_8bits(command))
+ chip->cmd_ctrl(mtd, column >> 8, ctrl);
+ }
+
+ if (page_addr != -1) {
+ chip->cmd_ctrl(mtd, page_addr, ctrl);
+ chip->cmd_ctrl(mtd, page_addr >> 8, NAND_NCE |
+ NAND_ALE);
+ /* One more address cycle for devices > 128MiB */
+ if (chip->chipsize > SZ_128M)
+ chip->cmd_ctrl(mtd, page_addr >> 16,
+ NAND_NCE | NAND_ALE);
+ }
+
+ switch (command) {
+ case NAND_CMD_READ0:
+ chip->cmd_ctrl(mtd, NAND_CMD_READSTART,
+ NAND_NCE | NAND_CLE | NAND_CTRL_CHANGE);
+ fallthrough;
+ case NAND_CMD_PARAM:
+ nand_wait_ready(mtd);
+ nand_exit_status_op(chip);
+ }
+ }
+}
+
+static void meson_nfc_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+
+ if (cmd == NAND_CMD_NONE)
+ return;
+
+ if (ctrl & NAND_CLE)
+ cmd = NFC_CMD_MAKE_CLE(nfc->param.chip_select, cmd);
+ else
+ cmd = NFC_CMD_MAKE_ALE(nfc->param.chip_select, cmd);
+
+ writel(cmd, nfc->reg_base + NFC_REG_CMD);
+}
+
+static void meson_nfc_wait_cmd_fifo(struct meson_nfc *nfc)
+{
+ while ((NFC_GET_CMD(nfc) >> 22) & GENMASK(4, 0))
+ ;
+}
+
+static u8 meson_nfc_nand_read_byte(struct mtd_info *mtd)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+
+ writel(NFC_CMD_MAKE_DRD(nfc->param.chip_select, 0), nfc->reg_base + NFC_REG_CMD);
+
+ meson_nfc_cmd_idle(nfc, NAND_TWB_TIME_CYCLE);
+ meson_nfc_cmd_idle(nfc, 0);
+ meson_nfc_cmd_idle(nfc, 0);
+
+ meson_nfc_wait_cmd_fifo(nfc);
+
+ return readl(nfc->reg_base + NFC_REG_BUF);
+}
+
+static void meson_nfc_nand_write_byte(struct mtd_info *mtd, u8 val)
+{
+ struct nand_chip *nand = mtd_to_nand(mtd);
+ struct meson_nfc *nfc = nand_get_controller_data(nand);
+
+ meson_nfc_cmd_idle(nfc, NAND_TWB_TIME_CYCLE);
+
+ writel(NFC_CMD_MAKE_DWR(nfc->param.chip_select, val), nfc->reg_base + NFC_REG_CMD);
+
+ meson_nfc_cmd_idle(nfc, NAND_TWB_TIME_CYCLE);
+ meson_nfc_cmd_idle(nfc, 0);
+ meson_nfc_cmd_idle(nfc, 0);
+
+ meson_nfc_wait_cmd_fifo(nfc);
+}
+
+static int meson_nfc_dev_ready(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+ unsigned int time_out_cnt = 0;
+
+ chip->select_chip(mtd, 0);
+
+ chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
+
+ do {
+ int status;
+
+ status = (int)chip->read_byte(mtd);
+ if (status & NAND_STATUS_READY)
+ break;
+ } while (time_out_cnt++ < NFC_DEV_READY_TICK_MAX);
+
+ return time_out_cnt != NFC_DEV_READY_TICK_MAX;
+}
+
+static int meson_chip_buffer_init(struct nand_chip *nand)
+{
+ const struct mtd_info *mtd = nand_to_mtd(nand);
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+ u32 page_bytes, info_bytes, nsectors;
+ unsigned long tmp_addr;
+
+ nsectors = mtd->writesize / nand->ecc.size;
+
+ page_bytes = mtd->writesize + mtd->oobsize;
+ info_bytes = nsectors * PER_INFO_BYTE;
+
+ meson_chip->data_buf = dma_alloc_coherent(page_bytes, &tmp_addr);
+ if (!meson_chip->data_buf)
+ return -ENOMEM;
+
+ meson_chip->info_buf = dma_alloc_coherent(info_bytes, &tmp_addr);
+ if (!meson_chip->info_buf) {
+ dma_free_coherent(meson_chip->data_buf);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static const int axg_stepinfo_strengths[] = { 8 };
+static const struct nand_ecc_step_info axg_stepinfo_1024 = {
+ .stepsize = 1024,
+ .strengths = axg_stepinfo_strengths,
+ .nstrengths = ARRAY_SIZE(axg_stepinfo_strengths)
+};
+
+static const struct nand_ecc_step_info axg_stepinfo_512 = {
+ .stepsize = 512,
+ .strengths = axg_stepinfo_strengths,
+ .nstrengths = ARRAY_SIZE(axg_stepinfo_strengths)
+};
+
+static const struct nand_ecc_step_info axg_stepinfo[] = { axg_stepinfo_1024, axg_stepinfo_512 };
+
+static const struct nand_ecc_caps meson_axg_ecc_caps = {
+ .stepinfos = axg_stepinfo,
+ .nstepinfos = ARRAY_SIZE(axg_stepinfo),
+ .calc_ecc_bytes = meson_nand_calc_ecc_bytes,
+};
+
+/*
+ * OOB layout:
+ *
+ * For ECC with 512 bytes step size:
+ * 0x00: AA AA BB BB BB BB BB BB BB BB BB BB BB BB BB BB
+ * 0x10: AA AA CC CC CC CC CC CC CC CC CC CC CC CC CC CC
+ * 0x20:
+ * 0x30:
+ *
+ * For ECC with 1024 bytes step size:
+ * 0x00: AA AA BB BB BB BB BB BB BB BB BB BB BB BB BB BB
+ * 0x10: AA AA CC CC CC CC CC CC CC CC CC CC CC CC CC CC
+ * 0x20: AA AA DD DD DD DD DD DD DD DD DD DD DD DD DD DD
+ * 0x30: AA AA EE EE EE EE EE EE EE EE EE EE EE EE EE EE
+ *
+ * AA - user bytes.
+ * BB, CC, DD, EE - ECC code bytes for each step.
+ */
+static struct nand_ecclayout nand_oob;
+
+static void meson_nfc_init_nand_oob(struct nand_chip *nand)
+{
+ int section_size = 2 + nand->ecc.bytes;
+ int i;
+ int k;
+
+ nand_oob.eccbytes = nand->ecc.steps * nand->ecc.bytes;
+ k = 0;
+
+ for (i = 0; i < nand->ecc.steps; i++) {
+ int j;
+
+ for (j = 0; j < nand->ecc.bytes; j++)
+ nand_oob.eccpos[k++] = (i * section_size) + 2 + j;
+
+ nand_oob.oobfree[i].offset = (i * section_size);
+ nand_oob.oobfree[i].length = 2;
+ }
+
+ nand_oob.oobavail = 2 * nand->ecc.steps;
+ nand->ecc.layout = &nand_oob;
+}
+
+static int meson_nfc_init_ecc(struct nand_chip *nand, ofnode node)
+{
+ const struct mtd_info *mtd = nand_to_mtd(nand);
+ int ret;
+ int i;
+
+ ret = nand_check_ecc_caps(nand, &meson_axg_ecc_caps, mtd->oobsize - 2);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(meson_ecc); i++) {
+ if (meson_ecc[i].strength == nand->ecc.strength &&
+ meson_ecc[i].size == nand->ecc.size) {
+ struct meson_nfc_nand_chip *meson_chip = to_meson_nand(nand);
+
+ nand->ecc.steps = mtd->writesize / nand->ecc.size;
+ meson_chip->bch_mode = meson_ecc[i].bch;
+
+ meson_nfc_init_nand_oob(nand);
+
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int meson_nfc_nand_chip_init(struct udevice *dev, struct meson_nfc *nfc,
+ ofnode node)
+{
+ struct meson_nfc_nand_chip *meson_chip;
+ struct nand_chip *nand;
+ struct mtd_info *mtd;
+ u32 cs[MAX_CE_NUM];
+ u32 nsels;
+ int ret;
+ int i;
+
+ if (!ofnode_get_property(node, "reg", &nsels)) {
+ dev_err(dev, "\"reg\" property is not found\n");
+ return -ENODEV;
+ }
+
+ nsels /= sizeof(u32);
+ if (nsels >= MAX_CE_NUM) {
+ dev_err(dev, "invalid size of CS array, max is %d\n",
+ MAX_CE_NUM);
+ return -EINVAL;
+ }
+
+ ret = ofnode_read_u32_array(node, "reg", cs, nsels);
+ if (ret < 0) {
+ dev_err(dev, "failed to read \"reg\" property\n");
+ return ret;
+ }
+
+ for (i = 0; i < nsels; i++) {
+ if (test_and_set_bit(cs[i], &nfc->assigned_cs)) {
+ dev_err(dev, "CS %d already assigned\n", cs[i]);
+ return -EINVAL;
+ }
+ }
+
+ meson_chip = malloc(sizeof(*meson_chip) + nsels * sizeof(meson_chip->sels[0]));
+ if (!meson_chip) {
+ dev_err(dev, "failed to allocate memory for chip\n");
+ return -ENOMEM;
+ }
+
+ meson_chip->nsels = nsels;
+ nand = &meson_chip->nand;
+
+ nand->flash_node = node;
+ nand_set_controller_data(nand, nfc);
+ /* Set the driver entry points for MTD */
+ nand->cmdfunc = meson_nfc_nand_cmd_function;
+ nand->cmd_ctrl = meson_nfc_cmd_ctrl;
+ nand->select_chip = meson_nfc_nand_select_chip;
+ nand->read_byte = meson_nfc_nand_read_byte;
+ nand->write_byte = meson_nfc_nand_write_byte;
+ nand->dev_ready = meson_nfc_dev_ready;
+
+ /* Buffer read/write routines */
+ nand->read_buf = meson_nfc_read_buf;
+ nand->write_buf = meson_nfc_write_buf;
+ nand->options |= NAND_NO_SUBPAGE_WRITE;
+
+ nand->ecc.mode = NAND_ECC_HW;
+ nand->ecc.hwctl = NULL;
+ nand->ecc.read_page = meson_nfc_read_page_hwecc;
+ nand->ecc.write_page = meson_nfc_write_page_hwecc;
+ nand->ecc.read_page_raw = meson_nfc_read_page_raw;
+ nand->ecc.write_page_raw = meson_nfc_write_page_raw;
+
+ nand->ecc.read_oob = meson_nfc_read_oob;
+ nand->ecc.write_oob = meson_nfc_write_oob;
+ nand->ecc.read_oob_raw = meson_nfc_read_oob_raw;
+ nand->ecc.write_oob_raw = meson_nfc_write_oob_raw;
+
+ nand->ecc.algo = NAND_ECC_BCH;
+
+ mtd = nand_to_mtd(nand);
+
+ ret = nand_scan_ident(mtd, 1, NULL);
+ if (ret) {
+ dev_err(dev, "'nand_scan_ident()' failed: %d\n", ret);
+ goto err_chip_free;
+ }
+
+ ret = meson_nfc_init_ecc(nand, node);
+ if (ret) {
+ dev_err(dev, "failed to init ECC settings: %d\n", ret);
+ goto err_chip_free;
+ }
+
+ ret = meson_chip_buffer_init(nand);
+ if (ret) {
+ dev_err(dev, "failed to init DMA buffers: %d\n", ret);
+ goto err_chip_free;
+ }
+
+ /* 'nand_scan_tail()' needs ECC parameters to be already
+ * set and correct.
+ */
+ ret = nand_scan_tail(mtd);
+ if (ret) {
+ dev_err(dev, "'nand_scan_tail()' failed: %d\n", ret);
+ goto err_chip_buf_free;
+ }
+
+ ret = nand_register(0, mtd);
+ if (ret) {
+ dev_err(dev, "'nand_register()' failed: %d\n", ret);
+ goto err_chip_buf_free;
+ }
+
+ list_add_tail(&meson_chip->node, &nfc->chips);
+
+ return 0;
+
+err_chip_buf_free:
+ dma_free_coherent(meson_chip->info_buf);
+ dma_free_coherent(meson_chip->data_buf);
+
+err_chip_free:
+ free(meson_chip);
+
+ return ret;
+}
+
+static int meson_nfc_nand_chips_init(struct udevice *dev,
+ struct meson_nfc *nfc)
+{
+ ofnode parent = dev_ofnode(dev);
+ ofnode node;
+
+ ofnode_for_each_subnode(node, parent) {
+ int ret = meson_nfc_nand_chip_init(dev, nfc, node);
+
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void meson_nfc_clk_init(struct meson_nfc *nfc)
+{
+ u32 bus_cycle = NFC_DEFAULT_BUS_CYCLE;
+ u32 bus_timing = NFC_DEFAULT_BUS_TIMING;
+ u32 bus_cfg_val;
+
+ writel(CLK_ALWAYS_ON_NAND | CLK_SELECT_NAND | CLK_ENABLE_VALUE, nfc->reg_clk);
+ writel(0, nfc->reg_base + NFC_REG_CFG);
+
+ bus_cfg_val = (((bus_cycle - 1) & 31) | ((bus_timing & 31) << 5));
+ writel(bus_cfg_val, nfc->reg_base + NFC_REG_CFG);
+ writel(BIT(31), nfc->reg_base + NFC_REG_CMD);
+}
+
+static int meson_probe(struct udevice *dev)
+{
+ struct meson_nfc *nfc = dev_get_priv(dev);
+ void *addr;
+ int ret;
+
+ addr = dev_read_addr_ptr(dev);
+ if (!addr) {
+ dev_err(dev, "base register address not found\n");
+ return -EINVAL;
+ }
+
+ nfc->reg_base = addr;
+
+ addr = dev_read_addr_index_ptr(dev, 1);
+ if (!addr) {
+ dev_err(dev, "clk register address not found\n");
+ return -EINVAL;
+ }
+
+ nfc->reg_clk = addr;
+ nfc->dev = dev;
+
+ meson_nfc_clk_init(nfc);
+
+ ret = meson_nfc_nand_chips_init(dev, nfc);
+ if (ret) {
+ dev_err(nfc->dev, "failed to init chips\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct udevice_id meson_nand_dt_ids[] = {
+ {.compatible = "amlogic,meson-axg-nfc",},
+ { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(meson_nand) = {
+ .name = "meson_nand",
+ .id = UCLASS_MTD,
+ .of_match = meson_nand_dt_ids,
+ .probe = meson_probe,
+ .priv_auto = sizeof(struct meson_nfc),
+};
+
+void board_nand_init(void)
+{
+ struct udevice *dev;
+ int ret;
+
+ ret = uclass_get_device_by_driver(UCLASS_MTD,
+ DM_DRIVER_GET(meson_nand), &dev);
+
+ if (ret && ret != -ENODEV)
+ pr_err("Failed to initialize: %d\n", ret);
+}