drivers/mtd/nand/raw/mxic_nand.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2021 Macronix International Co., Ltd.
 *
 * Author:
 *	Zhengxun Li <zhengxunli@mxic.com.tw>
 */

#include <clk.h>
#include <dm.h>
#include <malloc.h>
#include <nand.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <dm/device_compat.h>
#include <linux/bug.h>
#include <linux/errno.h>
#include <linux/iopoll.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/delay.h>

#define HC_CFG			0x0
#define HC_CFG_IF_CFG(x)	((x) << 27)
#define HC_CFG_DUAL_SLAVE	BIT(31)
#define HC_CFG_INDIVIDUAL	BIT(30)
#define HC_CFG_NIO(x)		(((x) / 4) << 27)
#define HC_CFG_TYPE(s, t)	((t) << (23 + ((s) * 2)))
#define HC_CFG_TYPE_SPI_NOR	0
#define HC_CFG_TYPE_SPI_NAND	1
#define HC_CFG_TYPE_SPI_RAM	2
#define HC_CFG_TYPE_RAW_NAND	3
#define HC_CFG_SLV_ACT(x)	((x) << 21)
#define HC_CFG_CLK_PH_EN	BIT(20)
#define HC_CFG_CLK_POL_INV	BIT(19)
#define HC_CFG_BIG_ENDIAN	BIT(18)
#define HC_CFG_DATA_PASS	BIT(17)
#define HC_CFG_IDLE_SIO_LVL(x)	((x) << 16)
#define HC_CFG_MAN_START_EN	BIT(3)
#define HC_CFG_MAN_START	BIT(2)
#define HC_CFG_MAN_CS_EN	BIT(1)
#define HC_CFG_MAN_CS_ASSERT	BIT(0)

#define INT_STS			0x4
#define INT_STS_EN		0x8
#define INT_SIG_EN		0xc
#define INT_STS_ALL		GENMASK(31, 0)
#define INT_RDY_PIN		BIT(26)
#define INT_RDY_SR		BIT(25)
#define INT_LNR_SUSP		BIT(24)
#define INT_ECC_ERR		BIT(17)
#define INT_CRC_ERR		BIT(16)
#define INT_LWR_DIS		BIT(12)
#define INT_LRD_DIS		BIT(11)
#define INT_SDMA_INT		BIT(10)
#define INT_DMA_FINISH		BIT(9)
#define INT_RX_NOT_FULL		BIT(3)
#define INT_RX_NOT_EMPTY	BIT(2)
#define INT_TX_NOT_FULL		BIT(1)
#define INT_TX_EMPTY		BIT(0)

#define HC_EN			0x10
#define HC_EN_BIT		BIT(0)

#define TXD(x)			(0x14 + ((x) * 4))
#define RXD			0x24

#define SS_CTRL(s)		(0x30 + ((s) * 4))
#define LRD_CFG			0x44
#define LWR_CFG			0x80
#define RWW_CFG			0x70
#define OP_READ			BIT(23)
#define OP_DUMMY_CYC(x)		((x) << 17)
#define OP_ADDR_BYTES(x)	((x) << 14)
#define OP_CMD_BYTES(x)		(((x) - 1) << 13)
#define OP_OCTA_CRC_EN		BIT(12)
#define OP_DQS_EN		BIT(11)
#define OP_ENHC_EN		BIT(10)
#define OP_PREAMBLE_EN		BIT(9)
#define OP_DATA_DDR		BIT(8)
#define OP_DATA_BUSW(x)		((x) << 6)
#define OP_ADDR_DDR		BIT(5)
#define OP_ADDR_BUSW(x)		((x) << 3)
#define OP_CMD_DDR		BIT(2)
#define OP_CMD_BUSW(x)		(x)
#define OP_BUSW_1		0
#define OP_BUSW_2		1
#define OP_BUSW_4		2
#define OP_BUSW_8		3

#define OCTA_CRC		0x38
#define OCTA_CRC_IN_EN(s)	BIT(3 + ((s) * 16))
#define OCTA_CRC_CHUNK(s, x)	((fls((x) / 32)) << (1 + ((s) * 16)))
#define OCTA_CRC_OUT_EN(s)	BIT(0 + ((s) * 16))

#define ONFI_DIN_CNT(s)		(0x3c + (s))

#define LRD_CTRL		0x48
#define RWW_CTRL		0x74
#define LWR_CTRL		0x84
#define LMODE_EN		BIT(31)
#define LMODE_SLV_ACT(x)	((x) << 21)
#define LMODE_CMD1(x)		((x) << 8)
#define LMODE_CMD0(x)		(x)

#define LRD_ADDR		0x4c
#define LWR_ADDR		0x88
#define LRD_RANGE		0x50
#define LWR_RANGE		0x8c

#define AXI_SLV_ADDR		0x54

#define DMAC_RD_CFG		0x58
#define DMAC_WR_CFG		0x94
#define DMAC_CFG_PERIPH_EN	BIT(31)
#define DMAC_CFG_ALLFLUSH_EN	BIT(30)
#define DMAC_CFG_LASTFLUSH_EN	BIT(29)
#define DMAC_CFG_QE(x)		(((x) + 1) << 16)
#define DMAC_CFG_BURST_LEN(x)	(((x) + 1) << 12)
#define DMAC_CFG_BURST_SZ(x)	((x) << 8)
#define DMAC_CFG_DIR_READ	BIT(1)
#define DMAC_CFG_START		BIT(0)

#define DMAC_RD_CNT		0x5c
#define DMAC_WR_CNT		0x98

#define SDMA_ADDR		0x60

#define DMAM_CFG		0x64
#define DMAM_CFG_START		BIT(31)
#define DMAM_CFG_CONT		BIT(30)
#define DMAM_CFG_SDMA_GAP(x)	(fls((x) / 8192) << 2)
#define DMAM_CFG_DIR_READ	BIT(1)
#define DMAM_CFG_EN		BIT(0)

#define DMAM_CNT		0x68

#define LNR_TIMER_TH		0x6c

#define RDM_CFG0		0x78
#define RDM_CFG0_POLY(x)	(x)

#define RDM_CFG1		0x7c
#define RDM_CFG1_RDM_EN		BIT(31)
#define RDM_CFG1_SEED(x)	(x)

#define LWR_SUSP_CTRL		0x90
#define LWR_SUSP_CTRL_EN	BIT(31)

#define DMAS_CTRL		0x9c
#define DMAS_CTRL_EN		BIT(31)
#define DMAS_CTRL_DIR_READ	BIT(30)

#define DATA_STROB		0xa0
#define DATA_STROB_EDO_EN	BIT(2)
#define DATA_STROB_INV_POL	BIT(1)
#define DATA_STROB_DELAY_2CYC	BIT(0)

#define IDLY_CODE(x)		(0xa4 + ((x) * 4))
#define IDLY_CODE_VAL(x, v)	((v) << (((x) % 4) * 8))

#define GPIO			0xc4
#define GPIO_PT(x)		BIT(3 + ((x) * 16))
#define GPIO_RESET(x)		BIT(2 + ((x) * 16))
#define GPIO_HOLDB(x)		BIT(1 + ((x) * 16))
#define GPIO_WPB(x)		BIT((x) * 16)

#define HC_VER			0xd0

#define HW_TEST(x)		(0xe0 + ((x) * 4))

#define MXIC_NFC_MAX_CLK_HZ	50000000
#define IRQ_TIMEOUT		1000

struct mxic_nand_ctrl {
	struct clk *send_clk;
	struct clk *send_dly_clk;
	void __iomem *regs;
	struct nand_chip nand_chip;
};

/*
 * struct mxic_nfc_command_format - Defines NAND flash command format
 * @start_cmd:		First cycle command (Start command)
 * @end_cmd:		Second cycle command (Last command)
 * @addr_len:		Number of address cycles required to send the address
 * @read:		Direction of command
 */

struct mxic_nfc_command_format {
	int start_cmd;
	int end_cmd;
	u8 addr_len;
	bool read;
};

/*  The NAND flash operations command format */
static const struct mxic_nfc_command_format mxic_nand_commands[] = {
	{NAND_CMD_READ0,	NAND_CMD_READSTART, 5, 1 },
	{NAND_CMD_RNDOUT,	NAND_CMD_RNDOUTSTART, 2, 1 },
	{NAND_CMD_READID,	NAND_CMD_NONE, 1, 1 },
	{NAND_CMD_STATUS,	NAND_CMD_NONE, 0, 1 },
	{NAND_CMD_SEQIN,	NAND_CMD_NONE, 5, 0 },
	{NAND_CMD_PAGEPROG,	NAND_CMD_NONE, 0, 0 },
	{NAND_CMD_CACHEDPROG,	NAND_CMD_NONE, 0, 0 },
	{NAND_CMD_RNDIN,	NAND_CMD_NONE, 2, 0 },
	{NAND_CMD_ERASE1,	NAND_CMD_NONE, 3, 0 },
	{NAND_CMD_ERASE2,	NAND_CMD_NONE, 0, 0 },
	{NAND_CMD_RESET,	NAND_CMD_NONE, 0, 0 },
	{NAND_CMD_PARAM,	NAND_CMD_NONE, 1, 1 },
	{NAND_CMD_GET_FEATURES,	NAND_CMD_NONE, 1, 1 },
	{NAND_CMD_SET_FEATURES,	NAND_CMD_NONE, 1, 0 },
	{NAND_CMD_NONE,		NAND_CMD_NONE, 0, 0 },
};

static int mxic_nfc_clk_enable(struct mxic_nand_ctrl *nfc)
{
	int ret;

	ret = clk_prepare_enable(nfc->send_clk);
	if (ret)
		return ret;

	ret = clk_prepare_enable(nfc->send_dly_clk);
	if (ret)
		goto err_send_dly_clk;

	return ret;

err_send_dly_clk:
	clk_disable_unprepare(nfc->send_clk);

	return ret;
}

static void mxic_nfc_clk_disable(struct mxic_nand_ctrl *nfc)
{
	clk_disable_unprepare(nfc->send_clk);
	clk_disable_unprepare(nfc->send_dly_clk);
}

static void mxic_nfc_set_input_delay(struct mxic_nand_ctrl *nfc, u8 idly_code)
{
	writel(IDLY_CODE_VAL(0, idly_code) |
	       IDLY_CODE_VAL(1, idly_code) |
	       IDLY_CODE_VAL(2, idly_code) |
	       IDLY_CODE_VAL(3, idly_code),
	       nfc->regs + IDLY_CODE(0));
	writel(IDLY_CODE_VAL(4, idly_code) |
	       IDLY_CODE_VAL(5, idly_code) |
	       IDLY_CODE_VAL(6, idly_code) |
	       IDLY_CODE_VAL(7, idly_code),
	       nfc->regs + IDLY_CODE(1));
}

static int mxic_nfc_clk_setup(struct mxic_nand_ctrl *nfc, unsigned long freq)
{
	int ret;

	ret = clk_set_rate(nfc->send_clk, freq);
	if (ret)
		return ret;

	ret = clk_set_rate(nfc->send_dly_clk, freq);
	if (ret)
		return ret;

	/*
	 * A constant delay range from 0x0 ~ 0x1F for input delay,
	 * the unit is 78 ps, the max input delay is 2.418 ns.
	 */
	mxic_nfc_set_input_delay(nfc, 0xf);

	return 0;
}

static int mxic_nfc_set_freq(struct mxic_nand_ctrl *nfc, unsigned long freq)
{
	int ret;

	if (freq > MXIC_NFC_MAX_CLK_HZ)
		freq = MXIC_NFC_MAX_CLK_HZ;

	mxic_nfc_clk_disable(nfc);
	ret = mxic_nfc_clk_setup(nfc, freq);
	if (ret)
		return ret;

	ret = mxic_nfc_clk_enable(nfc);
	if (ret)
		return ret;

	return 0;
}

static void mxic_nfc_hw_init(struct mxic_nand_ctrl *nfc)
{
	writel(HC_CFG_NIO(8) | HC_CFG_TYPE(1, HC_CFG_TYPE_RAW_NAND) |
	       HC_CFG_SLV_ACT(0) | HC_CFG_MAN_CS_EN |
	       HC_CFG_IDLE_SIO_LVL(1), nfc->regs + HC_CFG);
	writel(INT_STS_ALL, nfc->regs + INT_STS_EN);
	writel(INT_RDY_PIN, nfc->regs + INT_SIG_EN);
	writel(0x0, nfc->regs + ONFI_DIN_CNT(0));
	writel(0, nfc->regs + LRD_CFG);
	writel(0, nfc->regs + LRD_CTRL);
	writel(0x0, nfc->regs + HC_EN);
}

static void mxic_nfc_cs_enable(struct mxic_nand_ctrl *nfc)
{
	writel(readl(nfc->regs + HC_CFG) | HC_CFG_MAN_CS_EN,
	       nfc->regs + HC_CFG);
	writel(HC_CFG_MAN_CS_ASSERT | readl(nfc->regs + HC_CFG),
	       nfc->regs + HC_CFG);
}

static void mxic_nfc_cs_disable(struct mxic_nand_ctrl *nfc)
{
	writel(~HC_CFG_MAN_CS_ASSERT & readl(nfc->regs + HC_CFG),
	       nfc->regs + HC_CFG);
}

static int mxic_nfc_data_xfer(struct mxic_nand_ctrl *nfc, const void *txbuf,
			      void *rxbuf, unsigned int len)
{
	unsigned int pos = 0;

	while (pos < len) {
		unsigned int nbytes = len - pos;
		u32 data = 0xffffffff;
		u32 sts;
		int ret;

		if (nbytes > 4)
			nbytes = 4;

		if (txbuf)
			memcpy(&data, txbuf + pos, nbytes);

		ret = readl_poll_timeout(nfc->regs + INT_STS, sts,
					 sts & INT_TX_EMPTY, 1000000);
		if (ret)
			return ret;

		writel(data, nfc->regs + TXD(nbytes % 4));

		ret = readl_poll_timeout(nfc->regs + INT_STS, sts,
					 sts & INT_TX_EMPTY, 1000000);
		if (ret)
			return ret;

		ret = readl_poll_timeout(nfc->regs + INT_STS, sts,
					 sts & INT_RX_NOT_EMPTY, 1000000);
		if (ret)
			return ret;

		data = readl(nfc->regs + RXD);
		if (rxbuf) {
			data >>= (8 * (4 - nbytes));
			memcpy(rxbuf + pos, &data, nbytes);
		}

		WARN_ON(readl(nfc->regs + INT_STS) & INT_RX_NOT_EMPTY);

		pos += nbytes;
	}

	return 0;
}

static uint8_t mxic_nfc_read_byte(struct mtd_info *mtd)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct mxic_nand_ctrl *nfc = nand_get_controller_data(chip);
	u8 data;

	writel(0x0, nfc->regs + ONFI_DIN_CNT(0));
	writel(OP_DATA_BUSW(OP_BUSW_8) | OP_DUMMY_CYC(0x3F) |
	       OP_READ, nfc->regs + SS_CTRL(0));

	mxic_nfc_data_xfer(nfc, NULL, &data, 1);

	return data;
}

static void mxic_nfc_read_buf(struct mtd_info *mtd, uint8_t *rxbuf, int rlen)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct mxic_nand_ctrl *nfc = nand_get_controller_data(chip);

	writel(0x0, nfc->regs + ONFI_DIN_CNT(0));
	writel(OP_DATA_BUSW(OP_BUSW_8) | OP_DUMMY_CYC(0x3F) |
			    OP_READ, nfc->regs + SS_CTRL(0));

	mxic_nfc_data_xfer(nfc, NULL, rxbuf, rlen);
}

static void mxic_nfc_write_buf(struct mtd_info *mtd, const uint8_t *txbuf,
			       int wlen)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct mxic_nand_ctrl *nfc = nand_get_controller_data(chip);

	writel(wlen, nfc->regs + ONFI_DIN_CNT(0));
	writel(OP_DATA_BUSW(OP_BUSW_8) | OP_DUMMY_CYC(0x3F),
	       nfc->regs + SS_CTRL(0));

	mxic_nfc_data_xfer(nfc, txbuf, NULL, wlen);
}

static void mxic_nfc_cmd_function(struct mtd_info *mtd, unsigned int command,
				  int column, int page_addr)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct mxic_nand_ctrl *nfc = nand_get_controller_data(chip);
	const struct mxic_nfc_command_format *cmd = NULL;
	u32 sts;
	u8 index, addr[5];

	/* Emulate NAND_CMD_READOOB */
	if (command == NAND_CMD_READOOB) {
		column += mtd->writesize;
		command = NAND_CMD_READ0;
	}

	/* Get the command format */
	for (index = 0; index < ARRAY_SIZE(mxic_nand_commands); index++)
		if (command == mxic_nand_commands[index].start_cmd)
			break;

	cmd = &mxic_nand_commands[index];

	if (!(command == NAND_CMD_PAGEPROG ||
	      command == NAND_CMD_CACHEDPROG ||
	      command == NAND_CMD_ERASE2))
		mxic_nfc_cs_disable(nfc);

	mxic_nfc_cs_enable(nfc);

	if (column != -1) {
		addr[0] = column;
		addr[1] = column >> 8;

		if (page_addr != -1) {
			addr[2] = page_addr;
			addr[3] = page_addr >> 8;
			addr[4] = page_addr >> 16;
		}
	} else if (page_addr != -1) {
		addr[0] = page_addr;
		addr[1] = page_addr >> 8;
		addr[2] = page_addr >> 16;
	}

	writel(0, nfc->regs + HC_EN);
	writel(HC_EN_BIT, nfc->regs + HC_EN);
	writel(OP_CMD_BUSW(OP_BUSW_8) |  OP_DUMMY_CYC(0x3F) | OP_CMD_BYTES(0),
	       nfc->regs + SS_CTRL(0));

	mxic_nfc_data_xfer(nfc, &cmd->start_cmd, NULL, 1);

	if (cmd->addr_len) {
		writel(OP_ADDR_BUSW(OP_BUSW_8) | OP_DUMMY_CYC(0x3F) |
		       OP_ADDR_BYTES(cmd->addr_len), nfc->regs + SS_CTRL(0));

		mxic_nfc_data_xfer(nfc, &addr, NULL, cmd->addr_len);
	}

	if (cmd->end_cmd != NAND_CMD_NONE) {
		writel(0, nfc->regs + HC_EN);
		writel(HC_EN_BIT, nfc->regs + HC_EN);
		writel(OP_CMD_BUSW(OP_BUSW_8) |  OP_DUMMY_CYC(0x3F) |
		       OP_CMD_BYTES(0), nfc->regs + SS_CTRL(0));

		mxic_nfc_data_xfer(nfc, &cmd->end_cmd, NULL, 1);
	}

	readl_poll_timeout(nfc->regs + INT_STS, sts, sts & INT_RDY_PIN,
			   1000000);

	if (command == NAND_CMD_PAGEPROG ||
	    command == NAND_CMD_CACHEDPROG ||
	    command == NAND_CMD_ERASE2 ||
	    command == NAND_CMD_RESET) {
		mxic_nfc_cs_disable(nfc);
	}
}

static int mxic_nfc_setup_data_interface(struct mtd_info *mtd, int chipnr,
					 const struct nand_data_interface *conf)
{
	struct nand_chip *chip = mtd_to_nand(mtd);
	struct mxic_nand_ctrl *nfc = nand_get_controller_data(chip);
	const struct nand_sdr_timings *sdr;
	unsigned long freq;
	int ret;

	sdr = nand_get_sdr_timings(conf);
	if (IS_ERR(sdr))
		return PTR_ERR(sdr);

	if (chipnr == NAND_DATA_IFACE_CHECK_ONLY)
		return 0;

	freq = 1000000000 / (sdr->tRC_min / 1000);

	ret =  mxic_nfc_set_freq(nfc, freq);
	if (ret)
		WARN_ON("Set freq failed\n");

	if (sdr->tRC_min < 30000)
		writel(DATA_STROB_EDO_EN, nfc->regs + DATA_STROB);

	return 0;
}

/* Dummy implementation: we don't support multiple chips */
static void mxic_nfc_select_chip(struct mtd_info *mtd, int chipnr)
{
	switch (chipnr) {
	case -1:
	case 0:
		break;

	default:
		BUG();
	}
}

static int mxic_nfc_probe(struct udevice *dev)
{
	struct mxic_nand_ctrl *nfc = dev_get_priv(dev);
	struct nand_chip *nand_chip = &nfc->nand_chip;
	struct mtd_info *mtd;
	ofnode child;
	int err;

	nfc->regs = dev_read_addr_ptr(dev);

	nfc->send_clk = devm_clk_get(dev, "send");
	if (IS_ERR(nfc->send_clk))
		return PTR_ERR(nfc->send_clk);

	nfc->send_dly_clk = devm_clk_get(dev, "send_dly");
	if (IS_ERR(nfc->send_dly_clk))
		return PTR_ERR(nfc->send_dly_clk);

	mtd = nand_to_mtd(nand_chip);

	ofnode_for_each_subnode(child, dev_ofnode(dev))
		nand_set_flash_node(nand_chip, child);

	nand_set_controller_data(nand_chip, nfc);

	nand_chip->select_chip = mxic_nfc_select_chip;
	nand_chip->setup_data_interface = mxic_nfc_setup_data_interface;
	nand_chip->cmdfunc = mxic_nfc_cmd_function;
	nand_chip->read_byte = mxic_nfc_read_byte;
	nand_chip->read_buf = mxic_nfc_read_buf;
	nand_chip->write_buf = mxic_nfc_write_buf;

	mxic_nfc_hw_init(nfc);

	err = nand_scan(mtd, 1);
	if (err)
		return err;

	err = nand_register(0, mtd);
	if (err) {
		dev_err(dev, "Failed to register MTD: %d\n", err);
		return err;
	}

	return 0;
}

static const struct udevice_id mxic_nfc_of_ids[] = {
	{ .compatible = "mxic,multi-itfc-v009-nand-controller" },
	{ /* Sentinel */ }
};

U_BOOT_DRIVER(mxic_nfc) = {
	.name = "mxic_nfc",
	.id = UCLASS_MTD,
	.of_match = mxic_nfc_of_ids,
	.probe = mxic_nfc_probe,
	.priv_auto = sizeof(struct mxic_nand_ctrl),
};

void board_nand_init(void)
{
	struct udevice *dev;
	int ret;

	ret = uclass_get_device_by_driver(UCLASS_MTD,
					  DM_DRIVER_GET(mxic_nfc), &dev);
	if (ret && ret != -ENODEV)
		pr_err("Failed to initialize %s. (error %d)\n", dev->name,
		       ret);
}