[U-Boot,v2,10/19] mtd: nand: add the rockchip nand controller driver

Submitted by Paweł Jarosz on Aug. 11, 2017, 8:56 p.m.

Details

Message ID 7198c43de74cf91efaa4dfc5f94952d82b0fa862.1502483336.git.paweljarosz3691@gmail.com
State Superseded
Delegated to: Philipp Tomsich
Headers show

Commit Message

Paweł Jarosz Aug. 11, 2017, 8:56 p.m.
Add basic Rockchip nand driver.

Driver in current state has 16, 24, 40, 60 per 1024B BCH/ECC ability and 8 bit asynchronous flash interface support. Other features will come later.

Signed-off-by: Paweł Jarosz <paweljarosz3691@gmail.com>
---
Changes since v1:
- none

 drivers/mtd/nand/Kconfig         |   6 +
 drivers/mtd/nand/Makefile        |   1 +
 drivers/mtd/nand/rockchip_nand.c | 660 +++++++++++++++++++++++++++++++++++++++
 include/fdtdec.h                 |   1 +
 lib/fdtdec.c                     |   1 +
 5 files changed, 669 insertions(+)
 create mode 100644 drivers/mtd/nand/rockchip_nand.c

Patch hide | download patch | download mbox

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 3508c62..57a870d 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -66,6 +66,12 @@  config NAND_PXA3XX
 	  This enables the driver for the NAND flash device found on
 	  PXA3xx processors (NFCv1) and also on Armada 370/XP (NFCv2).
 
+config NAND_ROCKCHIP
+	bool "Support for NAND on Rockchip SoCs"
+	select SYS_NAND_SELF_INIT
+	---help---
+	Enable support for Rockchip nand.
+
 config NAND_SUNXI
 	bool "Support for NAND on Allwinner SoCs"
 	depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index c3d4a99..0659253 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -65,6 +65,7 @@  obj-$(CONFIG_NAND_OMAP_ELM) += omap_elm.o
 obj-$(CONFIG_NAND_PLAT) += nand_plat.o
 obj-$(CONFIG_NAND_SUNXI) += sunxi_nand.o
 obj-$(CONFIG_NAND_ZYNQ) += zynq_nand.o
+obj-$(CONFIG_NAND_ROCKCHIP) += rockchip_nand.o
 
 else  # minimal SPL drivers
 
diff --git a/drivers/mtd/nand/rockchip_nand.c b/drivers/mtd/nand/rockchip_nand.c
new file mode 100644
index 0000000..c997c43
--- /dev/null
+++ b/drivers/mtd/nand/rockchip_nand.c
@@ -0,0 +1,660 @@ 
+/*
+ * Copyright (c) 2017 Yifeng Zhao <yifeng.zhao@rock-chips.com>
+ * Copyright (c) 2017 Paweł Jarosz <paweljarosz3691@gmail.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <inttypes.h>
+#include <nand.h>
+#include <linux/kernel.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define NANDC_V6_BOOTROM_ECC	24
+#define	NANDC_V6_NUM_BANKS	8
+#define NANDC_V6_DEF_TIMEOUT	20000
+#define NANDC_V6_READ		0
+#define NANDC_V6_WRITE		1
+
+#define	NANDC_REG_V6_FMCTL	0x00
+#define	NANDC_REG_V6_FMWAIT	0x04
+#define	NANDC_REG_V6_FLCTL	0x08
+#define	NANDC_REG_V6_BCHCTL	0x0c
+#define	NANDC_REG_V6_DMA_CFG	0x10
+#define	NANDC_REG_V6_DMA_BUF0	0x14
+#define	NANDC_REG_V6_DMA_BUF1	0x18
+#define	NANDC_REG_V6_DMA_ST	0x1C
+#define	NANDC_REG_V6_BCHST	0x20
+#define	NANDC_REG_V6_RANDMZ	0x150
+#define	NANDC_REG_V6_VER	0x160
+#define	NANDC_REG_V6_INTEN	0x16C
+#define	NANDC_REG_V6_INTCLR 	0x170
+#define	NANDC_REG_V6_INTST	0x174
+#define	NANDC_REG_V6_SPARE0	0x200
+#define	NANDC_REG_V6_SPARE1	0x230
+#define	NANDC_REG_V6_BANK0	0x800
+#define	NANDC_REG_V6_SRAM0	0x1000
+#define	NANDC_REG_V6_SRAM_SIZE	0x400
+
+#define NANDC_REG_V6_DATA	0x00
+#define NANDC_REG_V6_ADDR	0x04
+#define NANDC_REG_V6_CMD	0x08
+
+/* FMCTL */
+#define NANDC_V6_FM_WP		BIT(8)
+#define NANDC_V6_FM_CE_SEL_M	0xFF
+#define NANDC_V6_FM_CE_SEL(x)	(1 << (x))
+#define NANDC_V6_FM_FREADY	BIT(9)
+
+/* FLCTL */
+#define NANDC_V6_FL_RST		BIT(0)
+#define NANDC_V6_FL_DIR_S	0x1
+#define NANDC_V6_FL_XFER_START	BIT(2)
+#define NANDC_V6_FL_XFER_EN	BIT(3)
+#define NANDC_V6_FL_ST_BUF_S	0x4
+#define NANDC_V6_FL_XFER_COUNT	BIT(5)
+#define NANDC_V6_FL_ACORRECT	BIT(10)
+#define NANDC_V6_FL_XFER_READY	BIT(20)
+
+/* BCHCTL */
+#define NAND_V6_BCH_REGION_S	0x5
+#define NAND_V6_BCH_REGION_M	0x7	
+
+/* BCHST */
+#define NANDC_V6_BCH0_ST_ERR	BIT(2)
+#define NANDC_V6_BCH1_ST_ERR	BIT(15)
+#define NANDC_V6_ECC_ERR_CNT0(x) ((((x & (0x1F << 3)) >> 3) \
+				| ((x & (1 << 27)) >> 22)) & 0x3F)
+#define NANDC_V6_ECC_ERR_CNT1(x) ((((x & (0x1F << 16)) >> 16) \
+				| ((x & (1 << 29)) >> 24)) & 0x3F)
+
+struct rk_nand {
+	uint32_t banks[NANDC_V6_NUM_BANKS];
+	struct nand_hw_control controller;
+	uint32_t ecc_strength;
+	struct mtd_info mtd;
+	bool bootromblocks;
+	void __iomem *regs;
+	int selected_bank;
+};
+
+static struct nand_ecclayout nand_oob_fix = {
+	.eccbytes = 24,
+	.eccpos = {
+		   4, 5, 6, 7, 8, 9, 10},
+	.oobfree = {
+		{.offset = 0,
+		 .length = 4} }
+};
+
+static inline struct rk_nand *to_rknand(struct nand_hw_control *ctrl)
+{
+	return container_of(ctrl, struct rk_nand, controller);
+}
+
+static void rockchip_nand_init(struct rk_nand *rknand)
+{
+	writel(0, rknand->regs + NANDC_REG_V6_RANDMZ);
+	writel(0, rknand->regs + NANDC_REG_V6_DMA_CFG);
+	writel(0, rknand->regs + NANDC_REG_V6_BCHCTL);
+	writel(NANDC_V6_FM_WP, rknand->regs + NANDC_REG_V6_FMCTL);
+	writel(0x1081, rknand->regs + NANDC_REG_V6_FMWAIT);
+}
+
+static void rockchip_nand_select_chip(struct mtd_info *mtd, int chipnr)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct rk_nand *rknand = to_rknand(chip->controller);
+	void __iomem *bank_base;
+	uint32_t reg;
+	int banknr;
+
+	reg = readl(rknand->regs + NANDC_REG_V6_FMCTL);
+	reg &= ~NANDC_V6_FM_CE_SEL_M;
+
+	if (chipnr == -1) {
+		banknr = -1;
+	} else {
+		banknr = rknand->banks[chipnr];
+		bank_base = rknand->regs + NANDC_REG_V6_BANK0 + banknr * 0x100;
+
+		chip->IO_ADDR_R = bank_base;
+		chip->IO_ADDR_W = bank_base;
+
+		reg |= 1 << banknr;
+	}
+	writel(reg, rknand->regs + NANDC_REG_V6_FMCTL);
+
+	rknand->selected_bank = banknr;
+}
+
+static void rockchip_nand_cmd_ctrl(struct mtd_info *mtd,
+				   int dat,
+				   unsigned int ctrl)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct rk_nand *rknand = to_rknand(chip->controller);
+	void __iomem *bank_base = rknand->regs + NANDC_REG_V6_BANK0
+				+ rknand->selected_bank * 0x100;
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if (ctrl & NAND_ALE)
+			bank_base += NANDC_REG_V6_ADDR;
+		else if (ctrl & NAND_CLE)
+			bank_base += NANDC_REG_V6_CMD;
+		chip->IO_ADDR_W = bank_base;
+	}
+
+	if (dat != NAND_CMD_NONE)
+		writeb(dat & 0xFF, chip->IO_ADDR_W);
+}
+
+static void rockchip_nand_read_buf(struct mtd_info *mtd,
+				   uint8_t *buf,
+				   int len)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct rk_nand *rknand = to_rknand(chip->controller);
+	int offs = 0;
+	void __iomem *bank_base = rknand->regs + NANDC_REG_V6_BANK0
+				+ rknand->selected_bank * 0x100;
+
+	for (offs = 0; offs < len; offs++)
+		buf[offs] = readb(bank_base);
+}
+
+static void rockchip_nand_write_buf(struct mtd_info *mtd,
+				    const uint8_t *buf,
+				    int len)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct rk_nand *rknand = to_rknand(chip->controller);
+	int offs = 0;
+	void __iomem *bank_base = rknand->regs + NANDC_REG_V6_BANK0
+				+ rknand->selected_bank * 0x100;
+
+	for (offs = 0; offs < len; offs++)
+		writeb(buf[offs], bank_base);
+}
+
+static uint8_t rockchip_nand_read_byte(struct mtd_info *mtd)
+{
+	uint8_t ret;
+
+	rockchip_nand_read_buf(mtd, &ret, 1);
+
+	return ret;
+}
+
+static int rockchip_nand_dev_ready(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct rk_nand *rknand = to_rknand(chip->controller);
+
+	if (readl(rknand->regs + NANDC_REG_V6_FMCTL) & NANDC_V6_FM_FREADY)
+		return 1;
+
+	return 0;
+}
+
+static int rockchip_nand_hw_ecc_setup(struct mtd_info *mtd,
+				      struct nand_ecc_ctrl *ecc,
+				      uint32_t strength)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct rk_nand *rknand = to_rknand(chip->controller);
+	u32 reg;
+
+	ecc->strength = strength;
+	ecc->bytes = DIV_ROUND_UP(ecc->strength * 14, 8);
+	ecc->bytes = ALIGN(ecc->bytes, 2);
+
+	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;
+	}
+	writel(reg, rknand->regs + NANDC_REG_V6_BCHCTL);
+
+	return 0;
+}
+
+static void rockchip_nand_pio_xfer_start(struct rk_nand *rknand,
+					 u8 dir,
+					 u8 st_buf)
+{
+	u32 reg;
+
+	reg = readl(rknand->regs + NANDC_REG_V6_BCHCTL);
+	reg = (reg & (~(NAND_V6_BCH_REGION_M << NAND_V6_BCH_REGION_S))) |
+	      (rknand->selected_bank << NAND_V6_BCH_REGION_S);
+	writel(reg, rknand->regs + NANDC_REG_V6_BCHCTL);
+
+	reg = (dir << NANDC_V6_FL_DIR_S) | (st_buf << NANDC_V6_FL_ST_BUF_S) |
+	      NANDC_V6_FL_XFER_EN | NANDC_V6_FL_XFER_COUNT |
+	      NANDC_V6_FL_ACORRECT;
+	writel(reg, rknand->regs + NANDC_REG_V6_FLCTL);
+
+	reg |= NANDC_V6_FL_XFER_START;
+	writel(reg, rknand->regs + NANDC_REG_V6_FLCTL);
+}
+
+static int rockchip_nand_wait_pio_xfer_done(struct rk_nand *rknand)
+{
+	int timeout = NANDC_V6_DEF_TIMEOUT;
+	int reg;
+
+	while (timeout--) {
+		reg = readl(rknand->regs + NANDC_REG_V6_FLCTL);
+
+		if ((reg & NANDC_V6_FL_XFER_READY) != 0)
+			break;
+
+		udelay(1);
+	}
+
+	if (timeout == 0)
+		return -1;
+
+	return 0;
+}
+
+static void rockchip_nand_read_extra_oob(struct mtd_info *mtd, u8 *oob)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+	int offset = ((ecc->bytes + ecc->prepad) * ecc->steps);
+	int len = mtd->oobsize - offset;
+
+	if (len <= 0)
+		return;
+
+	chip->cmdfunc(mtd, NAND_CMD_RNDOUT, offset + mtd->writesize, -1);
+
+	rockchip_nand_read_buf(mtd, oob + offset, len);
+}
+
+static void rockchip_nand_write_extra_oob(struct mtd_info *mtd, u8 *oob)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+	int offset = ((ecc->bytes + ecc->prepad) * ecc->steps);
+	int len = mtd->oobsize - offset;
+
+	if (len <= 0)
+		return;
+
+	chip->cmdfunc(mtd, NAND_CMD_RNDIN, offset + mtd->writesize, -1);
+
+	rockchip_nand_write_buf(mtd, oob + offset, len);
+}
+
+
+static int rockchip_nand_hw_syndrome_pio_read_page(struct mtd_info *mtd,
+						   struct nand_chip *chip,
+						   uint8_t *buf,
+						   int oob_required,
+						   int page)
+{
+	struct rk_nand *rknand = to_rknand(chip->controller);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+	void __iomem *sram_base = rknand->regs + NANDC_REG_V6_SRAM0;
+	unsigned int max_bitflips = 0;
+	int ret, step, bch_st;
+	int offset = page * mtd->writesize;
+
+	if (rknand->bootromblocks && (offset < (7 * mtd->erasesize)))
+		rockchip_nand_hw_ecc_setup(mtd, ecc, NANDC_V6_BOOTROM_ECC);
+
+	rockchip_nand_pio_xfer_start(rknand, NANDC_V6_READ, 0);
+
+	for (step = 0; step < ecc->steps; step++) {
+		int data_off = step * ecc->size;
+		int oob_off = step * (ecc->bytes + ecc->prepad);
+		u8 *data = buf + data_off;
+		u8 *oob = chip->oob_poi + oob_off;
+
+		ret = rockchip_nand_wait_pio_xfer_done(rknand);
+		if (ret)
+			return ret;
+
+		bch_st = readl(rknand->regs + NANDC_REG_V6_BCHST);
+
+		if (bch_st & NANDC_V6_BCH0_ST_ERR) {
+			mtd->ecc_stats.failed++;
+			max_bitflips = -1;
+		} else {
+			ret = NANDC_V6_ECC_ERR_CNT0(bch_st);
+			mtd->ecc_stats.corrected += ret;
+			max_bitflips = max_t(unsigned int, max_bitflips, ret);
+		}
+
+		if ((step + 1) < ecc->steps)
+			rockchip_nand_pio_xfer_start(rknand, NANDC_V6_READ,
+					      		(step + 1) & 0x1);
+
+		memcpy_fromio(data, sram_base + NANDC_REG_V6_SRAM_SIZE *
+			     				(step & 1), ecc->size);
+
+		if (step & 1)
+			memcpy_fromio(oob, rknand->regs + NANDC_REG_V6_SPARE1, 4);
+		else
+			memcpy_fromio(oob, rknand->regs + NANDC_REG_V6_SPARE0, 4);
+	}
+
+	rockchip_nand_read_extra_oob(mtd, chip->oob_poi);
+
+	if (rknand->bootromblocks)
+		rockchip_nand_hw_ecc_setup(mtd, ecc, rknand->ecc_strength);
+
+	return max_bitflips;
+}
+
+static uint32_t rockchip_nand_make_bootrom_compat(struct mtd_info *mtd,
+						  int page,
+						  const u8 *oob,
+						  bool bootromblocks)
+{
+	int pages_per_block = mtd->erasesize / mtd->writesize;
+	int offset = page * mtd->writesize;
+
+	if ((offset < (2 * mtd->erasesize)) || !(page % 2) ||
+	    (offset >= (7 * mtd->erasesize)) || !bootromblocks)
+		return oob[3] | (oob[2] << 8) | (oob[1] << 16) | (oob[0] << 24);
+
+	return (page % pages_per_block + 1) * 4;
+}
+
+static int rockchip_nand_hw_syndrome_pio_write_page(struct mtd_info *mtd,
+						    struct nand_chip *chip,
+						    const uint8_t *buf,
+						    int oob_required,
+						    int page)
+{
+	struct rk_nand *rknand = to_rknand(chip->controller);
+	struct nand_ecc_ctrl *ecc = &chip->ecc;
+	void __iomem *sram_base = rknand->regs + NANDC_REG_V6_SRAM0;
+	int ret, index, step = 0;
+	int offset = page * mtd->writesize;
+	int data_off = step * ecc->size;
+	int oob_off = step * (ecc->bytes + ecc->prepad);
+	const u8 *data = buf + data_off;
+	const u8 *oob = chip->oob_poi + oob_off;
+
+	if (rknand->bootromblocks && (offset < (7 * mtd->erasesize)))
+		rockchip_nand_hw_ecc_setup(mtd, ecc, NANDC_V6_BOOTROM_ECC);
+
+	index = rockchip_nand_make_bootrom_compat(mtd, page, oob,
+					   rknand->bootromblocks);
+
+	memcpy_toio(sram_base, data, ecc->size);
+	memcpy_toio(rknand->regs + NANDC_REG_V6_SPARE0, &index, ecc->prepad);
+
+	for (step = 1; step <= ecc->steps; step++) {
+		rockchip_nand_pio_xfer_start(rknand, NANDC_V6_WRITE,
+					     (step - 1) & 0x1);
+
+		data_off = step * ecc->size;
+		oob_off = step * (ecc->bytes + ecc->prepad);
+		data = buf + data_off;
+		oob = chip->oob_poi + oob_off;
+
+		if (step < ecc->steps) {
+			memcpy_toio(sram_base + NANDC_REG_V6_SRAM_SIZE * 
+				    (step & 1), data, ecc->size);
+			if (step & 1)
+				memcpy_toio(rknand->regs + NANDC_REG_V6_SPARE1,
+					    oob, ecc->prepad);
+			else
+				memcpy_toio(rknand->regs + NANDC_REG_V6_SPARE0,
+					    oob, ecc->prepad);
+		}
+
+		ret = rockchip_nand_wait_pio_xfer_done(rknand);
+		if (ret)
+			return ret;
+	}
+
+	rockchip_nand_write_extra_oob(mtd, chip->oob_poi);
+
+	rockchip_nand_hw_ecc_setup(mtd, ecc, rknand->ecc_strength);
+
+	return 0;
+}
+
+static const u8 strengths[] = {60, 40, 24, 16};
+
+static int rockchip_nand_ecc_max_strength(struct mtd_info *mtd,
+					  struct nand_ecc_ctrl *ecc)
+{
+	uint32_t max_strength, index;
+	
+	max_strength = ((mtd->oobsize / ecc->steps) - ecc->prepad) * 8 / 14;
+
+	for (index = 0; index < ARRAY_SIZE(strengths); index++)
+		if (max_strength >= strengths[index])
+			break;
+
+	if (index >= ARRAY_SIZE(strengths))
+		return -ENOTSUPP;
+
+	return strengths[index];
+}
+
+static bool rockchip_nand_strength_is_valid(int strength)
+{
+	uint32_t index;
+
+	for (index = 0; index < ARRAY_SIZE(strengths); index++)
+		if (strength >= strengths[index])
+			break;
+
+	if (index >= ARRAY_SIZE(strengths))
+		return false;
+
+	return true;
+}
+
+static int rockchip_nand_hw_ecc_ctrl_init(struct mtd_info *mtd,
+					  struct nand_ecc_ctrl *ecc)
+{
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct rk_nand *rknand = to_rknand(chip->controller);
+	uint32_t strength;
+	int index;
+
+	ecc->prepad = 4;
+	ecc->steps = mtd->writesize / ecc->size;
+
+	if (fdtdec_get_bool(gd->fdt_blob, chip->flash_node,
+			    "rockchip,protect-bootrom-blocks"))
+                rknand->bootromblocks = true;
+	else
+		rknand->bootromblocks = false;
+
+	if (rockchip_nand_strength_is_valid(ecc->strength))
+		strength = ecc->strength;
+	else
+		strength = rockchip_nand_ecc_max_strength(mtd, ecc);
+
+	rockchip_nand_hw_ecc_setup(mtd, ecc, strength);
+
+	rknand->ecc_strength = ecc->strength;
+
+	nand_oob_fix.eccbytes = ecc->bytes * ecc->steps;
+	for (index = 0; index < ecc->bytes; index++)
+		nand_oob_fix.eccpos[index] = index + ecc->prepad;
+	ecc->layout = &nand_oob_fix;
+
+	if (mtd->oobsize < ((ecc->bytes + ecc->prepad) * ecc->steps)) {
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int rockchip_nand_ecc_init(struct mtd_info *mtd,
+				  struct nand_ecc_ctrl *ecc)
+{
+	int ret;
+
+	switch (ecc->mode) {
+	case NAND_ECC_HW_SYNDROME:
+		ret = rockchip_nand_hw_ecc_ctrl_init(mtd, ecc);
+		if (ret)
+			return ret;
+		ecc->read_page =  rockchip_nand_hw_syndrome_pio_read_page;
+		ecc->write_page = rockchip_nand_hw_syndrome_pio_write_page;
+		break;
+	case NAND_ECC_SOFT_BCH:
+	case NAND_ECC_NONE:
+	case NAND_ECC_SOFT:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int rockchip_nand_chip_init(int node, struct rk_nand *rknand, int devnum)
+{
+	const void *blob = gd->fdt_blob;
+	struct nand_chip *chip;
+	struct mtd_info *mtd;
+	int ret;
+
+	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+
+	chip->chip_delay = 50;
+	chip->flash_node = node;
+	chip->select_chip = rockchip_nand_select_chip;
+	chip->cmd_ctrl = rockchip_nand_cmd_ctrl;
+	chip->read_buf = rockchip_nand_read_buf;
+	chip->write_buf = rockchip_nand_write_buf;
+	chip->read_byte = rockchip_nand_read_byte;
+	chip->dev_ready = rockchip_nand_dev_ready;
+	chip->controller = &rknand->controller;
+
+	rknand->banks[devnum] = fdtdec_get_int(blob, node, "reg", -1);
+
+	if (rknand->banks[devnum] < 0)
+		return -EINVAL;
+
+	mtd = nand_to_mtd(chip);
+	mtd->name = "rknand";
+
+	ret = nand_scan_ident(mtd, 1, NULL);
+	if (ret)
+		return ret;
+
+	ret = rockchip_nand_ecc_init(mtd, &chip->ecc);
+	if (ret) {
+		debug("rockchip_nand_ecc_init failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = nand_scan_tail(mtd);
+	if (ret) {
+		debug("nand_scan_tail failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = nand_register(devnum, mtd);
+	if (ret) {
+		debug("Failed to register mtd device: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rockchip_nand_chips_init(int node, struct rk_nand *rknand)
+{
+	const void *blob = gd->fdt_blob;
+	int nand_node;
+	int ret, i = 0;
+
+	for (nand_node = fdt_first_subnode(blob, node); nand_node >= 0;
+	     nand_node = fdt_next_subnode(blob, nand_node)) {
+		ret = rockchip_nand_chip_init(nand_node, rknand, i++);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+void board_nand_init(void)
+{
+	const void *blob = gd->fdt_blob;
+	struct rk_nand *rknand;
+	fdt_addr_t regs;
+	int node;
+	int ret;
+
+	rknand = kzalloc(sizeof(*rknand), GFP_KERNEL);
+
+	node = fdtdec_next_compatible(blob, 0, COMPAT_ROCKCHIP_NANDC);
+
+	if (node < 0) {
+		debug("Nand node not found\n");
+		goto err;
+	}
+
+	if (!fdtdec_get_is_enabled(blob, node)) {
+		debug("Nand disabled in device tree\n");
+		goto err;
+	}
+
+	regs = fdtdec_get_addr(blob, node, "reg");
+	if (regs == FDT_ADDR_T_NONE) {
+		debug("Nand address not found\n");
+		goto err;
+	}
+
+	rknand->regs = (void *)regs;
+
+	spin_lock_init(&rknand->controller.lock);
+	init_waitqueue_head(&rknand->controller.wq);
+
+	rockchip_nand_init(rknand);
+
+	ret = rockchip_nand_chips_init(node, rknand);
+	if (ret) {
+		debug("Failed to init nand chips\n");
+		goto err;
+	}
+
+	return;
+err:
+	kfree(rknand);
+}
+
+int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
+{
+	struct mtd_info *mtd;
+
+	mtd = get_nand_dev_by_index(0);
+	return nand_read_skip_bad(mtd, offs, &size, NULL, size, (u_char *)dst);
+}
+
+void nand_deselect(void) {}
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 4a0947c..0e68788 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -157,6 +157,7 @@  enum fdt_compat_id {
 	COMPAT_ALTERA_SOCFPGA_F2SDR0,           /* SoCFPGA fpga2SDRAM0 bridge */
 	COMPAT_ALTERA_SOCFPGA_F2SDR1,           /* SoCFPGA fpga2SDRAM1 bridge */
 	COMPAT_ALTERA_SOCFPGA_F2SDR2,           /* SoCFPGA fpga2SDRAM2 bridge */
+	COMPAT_ROCKCHIP_NANDC,			/* Rockchip NAND controller */
 
 	COMPAT_COUNT,
 };
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index d2dbd0f..6e814cf 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -70,6 +70,7 @@  static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(ALTERA_SOCFPGA_F2SDR0, "altr,socfpga-fpga2sdram0-bridge"),
 	COMPAT(ALTERA_SOCFPGA_F2SDR1, "altr,socfpga-fpga2sdram1-bridge"),
 	COMPAT(ALTERA_SOCFPGA_F2SDR2, "altr,socfpga-fpga2sdram2-bridge"),
+	COMPAT(ROCKCHIP_NANDC, "rockchip,nandc"),
 };
 
 const char *fdtdec_get_compatible(enum fdt_compat_id id)