Re: [PATCH v4 1/2] mtd: rawnand: Add Macronix Raw NAND controller

Miquel Raynal
2019-06-27T17:36:47Z

Hi Mason,

Mason Yang <masonccyang@mxic.com.tw> wrote on Tue, 25 Jun 2019 14:10:55
+0800:

> Add a driver for Macronix raw NAND controller.

Could you pass userspace major MTD tests and can you attach/mount/edit
a UBI/UBIFS storage?

Looks pretty nice to me, a few comments below.

>
> Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
> ---
> drivers/mtd/nand/raw/Kconfig | 6 +
> drivers/mtd/nand/raw/Makefile | 1 +
> drivers/mtd/nand/raw/mxic_nand.c | 551 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 558 insertions(+)
> create mode 100644 drivers/mtd/nand/raw/mxic_nand.c
>
> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
> index 5a711d8..9cff36a 100644
> --- a/drivers/mtd/nand/raw/Kconfig
> +++ b/drivers/mtd/nand/raw/Kconfig
> @@ -407,6 +407,12 @@ config MTD_NAND_MTK
> Enables support for NAND controller on MTK SoCs.
> This controller is found on mt27xx, mt81xx, mt65xx SoCs.
>
> +config MTD_NAND_MXIC
> + tristate "Macronix raw NAND controller"
> + depends on HAS_IOMEM || COMPILE_TEST
> + help
> + This selects the Macronix raw NAND controller driver.
> +
> config MTD_NAND_TEGRA
> tristate "NVIDIA Tegra NAND controller"
> depends on ARCH_TEGRA || COMPILE_TEST
> diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile
> index efaf5cd..9b43fbf 100644
> --- a/drivers/mtd/nand/raw/Makefile
> +++ b/drivers/mtd/nand/raw/Makefile
> @@ -54,6 +54,7 @@ obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
> obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
> obj-$(CONFIG_MTD_NAND_QCOM) += qcom_nandc.o
> obj-$(CONFIG_MTD_NAND_MTK) += mtk_ecc.o mtk_nand.o
> +obj-$(CONFIG_MTD_NAND_MXIC) += mxic_nand.o
> obj-$(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
> diff --git a/drivers/mtd/nand/raw/mxic_nand.c b/drivers/mtd/nand/raw/mxic_nand.c
> new file mode 100644
> index 0000000..14c0b3b
> --- /dev/null
> +++ b/drivers/mtd/nand/raw/mxic_nand.c
> @@ -0,0 +1,551 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2019 Macronix International Co., Ltd.
> + *
> + * Author:
> + * Mason Yang <masonccyang@mxic.com.tw>
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/mtd/rawnand.h>
> +#include <linux/mtd/nand_ecc.h>
> +#include <linux/platform_device.h>
> +
> +#include "internals.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_DIR_READ BIT(31)
> +#define DMAS_CTRL_EN 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
> +
> +struct mxic_nand_ctlr {
> + struct clk *ps_clk;
> + struct clk *send_clk;
> + struct clk *send_dly_clk;
> + void __iomem *regs;
> + struct nand_controller controller;
> + void *priv;
> +};
> +
> +struct mxic_nand_chip {
> + struct nand_chip chip;
> +};
> +
> +static int mxic_nfc_clk_enable(struct mxic_nand_ctlr *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;

I'm not sure why you only enable 2 out of 3 clocks and also why ou
handle two of them here (which is great, I prefer having a separate
helper for that) and the other one elsewhere?

> +
> + return ret;
> +
> +err_send_dly_clk:
> + clk_disable_unprepare(nfc->send_clk);
> +
> + return ret;
> +}
> +
> +static void mxic_nfc_clk_disable(struct mxic_nand_ctlr *nfc)
> +{
> + clk_disable_unprepare(nfc->send_clk);
> + clk_disable_unprepare(nfc->send_dly_clk);
> +}
> +
> +static void mxic_nfc_set_input_delay(struct mxic_nand_ctlr *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_ctlr *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);
> +
> + /*
> + * Phase degree = 360 * freq * output-delay
> + * where output-delay is a constant value 1 ns in FPGA.

Will it always be in FPGA?

> + *
> + * Get Phase degree = 360 * freq * 1 ns
> + * = 360 * freq * 1 sec / 1000000000
> + * = 9 * freq / 25000000
> + */
> + ret = clk_set_phase(nfc->send_dly_clk, 9 * freq / 25000000);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int mxic_nfc_set_freq(struct mxic_nand_ctlr *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_ctlr *nfc)
> +{
> + writel(DATA_STROB_EDO_EN, nfc->regs + DATA_STROB);
> + 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(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);
> +
> + /* Default 10 MHz to setup tRC_min/tWC_min:100 ns */
> + mxic_nfc_set_freq(nfc, 10000000);
> +}
> +
> +static void mxic_nfc_cs_enable(struct mxic_nand_ctlr *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);

So you can drive only one CS with this controller?

> +}
> +
> +static void mxic_nfc_cs_disable(struct mxic_nand_ctlr *nfc)
> +{
> + writel(~HC_CFG_MAN_CS_ASSERT & readl(nfc->regs + HC_CFG),
> + nfc->regs + HC_CFG);
> +}
> +
> +static int mxic_nfc_wait_ready(struct nand_chip *chip)
> +{
> + struct mxic_nand_ctlr *nfc = nand_get_controller_data(chip);
> + u32 sts;
> +
> + return readl_poll_timeout(nfc->regs + INT_STS, sts,
> + sts & INT_RDY_PIN, 0, USEC_PER_SEC);
> +}
> +
> +static int mxic_nfc_data_xfer(struct mxic_nand_ctlr *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, 0, USEC_PER_SEC);
> + if (ret)
> + return ret;
> +
> + writel(data, nfc->regs + TXD(nbytes % 4));
> +
> + if (rxbuf) {
> + ret = readl_poll_timeout(nfc->regs + INT_STS, sts,
> + sts & INT_TX_EMPTY, 0,
> + USEC_PER_SEC);
> + if (ret)
> + return ret;
> +
> + ret = readl_poll_timeout(nfc->regs + INT_STS, sts,
> + sts & INT_RX_NOT_EMPTY, 0,
> + USEC_PER_SEC);
> + if (ret)
> + return ret;
> +
> + data = readl(nfc->regs + RXD);
> + data >>= (8 * (4 - nbytes));
> + memcpy(rxbuf + pos, &data, nbytes);
> + WARN_ON(readl(nfc->regs + INT_STS) & INT_RX_NOT_EMPTY);
> + } else {
> + readl(nfc->regs + RXD);
> + }
> + WARN_ON(readl(nfc->regs + INT_STS) & INT_RX_NOT_EMPTY);

WARN_ON() is maybe a bit overkill here?

> +
> + pos += nbytes;
> + }
> +
> + return 0;
> +}
> +
> +static int mxic_nfc_exec_op(struct nand_chip *chip,
> + const struct nand_operation *op, bool check_only)
> +{
> + struct mxic_nand_ctlr *nfc = nand_get_controller_data(chip);
> + const struct nand_op_instr *instr = NULL;
> + int ret = 0;
> + unsigned int op_id;
> +
> + mxic_nfc_cs_enable(nfc);
> +
> + for (op_id = 0; op_id < op->ninstrs; op_id++) {
> + instr = &op->instrs[op_id];
> +
> + switch (instr->type) {
> + case NAND_OP_CMD_INSTR:
> + 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));
> +
> + ret = mxic_nfc_data_xfer(nfc,
> + &instr->ctx.cmd.opcode,
> + NULL, 1);
> + break;
> +
> + case NAND_OP_ADDR_INSTR:
> + writel(OP_ADDR_BUSW(OP_BUSW_8) | OP_DUMMY_CYC(0x3F) |
> + OP_ADDR_BYTES(instr->ctx.addr.naddrs),
> + nfc->regs + SS_CTRL(0));
> + ret = mxic_nfc_data_xfer(nfc,
> + instr->ctx.addr.addrs, NULL,
> + instr->ctx.addr.naddrs);
> + break;
> +
> + case NAND_OP_DATA_IN_INSTR:
> + 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));
> + ret = mxic_nfc_data_xfer(nfc, NULL,
> + instr->ctx.data.buf.in,
> + instr->ctx.data.len);
> + break;
> +
> + case NAND_OP_DATA_OUT_INSTR:
> + writel(instr->ctx.data.len,
> + nfc->regs + ONFI_DIN_CNT(0));
> + writel(OP_DATA_BUSW(OP_BUSW_8) | OP_DUMMY_CYC(0x3F),
> + nfc->regs + SS_CTRL(0));
> + ret = mxic_nfc_data_xfer(nfc,
> + instr->ctx.data.buf.out, NULL,
> + instr->ctx.data.len);
> + break;
> +
> + case NAND_OP_WAITRDY_INSTR:
> + ret = mxic_nfc_wait_ready(chip);
> + break;
> + }
> + }
> +
> + mxic_nfc_cs_disable(nfc);
> + return ret;
> +}
> +
> +static int mxic_nfc_setup_data_interface(struct nand_chip *chip, int chipnr,
> + const struct nand_data_interface *conf)
> +{
> + struct mxic_nand_ctlr *nfc = nand_get_controller_data(chip);
> + const struct nand_sdr_timings *sdr;
> + unsigned long freq;
> +
> + sdr = nand_get_sdr_timings(conf);
> + if (IS_ERR(sdr))
> + return PTR_ERR(sdr);
> +
> + if (chipnr < 0)
> + return 0;
> +
> + if (sdr->tRC_min)
> + freq = 1000000000 / (sdr->tRC_min / 1000);
> +
> + return mxic_nfc_set_freq(nfc, freq);
> +}
> +
> +static const struct nand_controller_ops mxic_nand_controller_ops = {
> + .exec_op = mxic_nfc_exec_op,
> + .setup_data_interface = mxic_nfc_setup_data_interface,
> +};
> +
> +static int mxic_nfc_probe(struct platform_device *pdev)
> +{
> + struct mtd_info *mtd;
> + struct mxic_nand_ctlr *nfc;
> + struct mxic_nand_chip *mxic_nand;
> + struct nand_chip *nand_chip;
> + struct resource *res;
> + int err;
> +
> + nfc = devm_kzalloc(&pdev->dev, sizeof(struct mxic_nand_ctlr),
> + GFP_KERNEL);
> + if (!nfc)
> + return -ENOMEM;
> +
> + mxic_nand = devm_kzalloc(&pdev->dev, sizeof(struct mxic_nand_chip),
> + GFP_KERNEL);
> + if (!mxic_nand)
> + return -ENOMEM;
> +
> + nfc->ps_clk = devm_clk_get(&pdev->dev, "ps_clk");
> + if (IS_ERR(nfc->ps_clk))
> + return PTR_ERR(nfc->ps_clk);
> +
> + nfc->send_clk = devm_clk_get(&pdev->dev, "send_clk");
> + if (IS_ERR(nfc->send_clk))
> + return PTR_ERR(nfc->send_clk);
> +
> + nfc->send_dly_clk = devm_clk_get(&pdev->dev, "send_dly_clk");
> + if (IS_ERR(nfc->send_dly_clk))
> + return PTR_ERR(nfc->send_dly_clk);
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
> + nfc->regs = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(nfc->regs))
> + return PTR_ERR(nfc->regs);
> +
> + nand_chip = &mxic_nand->chip;
> + mtd = nand_to_mtd(nand_chip);
> + mtd->dev.parent = &pdev->dev;
> + nand_chip->ecc.priv = NULL;
> + nand_set_flash_node(nand_chip, pdev->dev.of_node);
> + nand_chip->priv = nfc;
> + nfc->priv = nand_chip;
> +
> + nfc->controller.ops = &mxic_nand_controller_ops;
> + nand_controller_init(&nfc->controller);
> + nand_chip->controller = &nfc->controller;
> +
> + mxic_nfc_hw_init(nfc);
> +
> + err = nand_scan(nand_chip, 1);
> + if (err)
> + goto fail;
> +
> + err = mtd_device_register(mtd, NULL, 0);
> + if (err)
> + goto fail;
> +
> + platform_set_drvdata(pdev, nfc);
> + return 0;
> +
> +fail:
> + mxic_nfc_clk_disable(nfc);
> + clk_disable_unprepare(nfc->ps_clk);
> + return err;
> +}
> +
> +static int mxic_nfc_remove(struct platform_device *pdev)
> +{
> + struct mxic_nand_ctlr *nfc = platform_get_drvdata(pdev);
> +
> + nand_release(nfc->priv);
> + mxic_nfc_clk_disable(nfc);
> + clk_disable_unprepare(nfc->ps_clk);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id mxic_nfc_of_ids[] = {
> + { .compatible = "mxic,raw-nand-ctlr", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, mxic_nfc_of_ids);
> +
> +static struct platform_driver mxic_nfc_driver = {
> + .probe = mxic_nfc_probe,
> + .remove = mxic_nfc_remove,
> + .driver = {
> + .name = "mxic-nfc",
> + .of_match_table = mxic_nfc_of_ids,
> + },
> +};
> +module_platform_driver(mxic_nfc_driver);
> +
> +MODULE_AUTHOR("Mason Yang <masonccyang@mxic.com.tw>");
> +MODULE_DESCRIPTION("Macronix RAW NAND Flash Controller driver");
> +MODULE_LICENSE("GPL v2");

Thanks,
Miquèl