Message-ID: <57709C2A.3050102@hisilicon.com>
Date:	Mon, 27 Jun 2016 11:23:22 +0800
From:	Jiancheng Xue <xuejiancheng@...ilicon.com>
To:	<computersforpeace@...il.com>
CC:	<cyrille.pitchen@...el.com>, <linux-kernel@...r.kernel.org>,
	<linux-mtd@...ts.infradead.org>, <yanhaifeng@...ilicon.com>,
	"yanghongwei@...ilicon.com" <yanghongwei@...ilicon.com>
Subject: Re: [RESEND PATCH v11] mtd: spi-nor: add hisilicon spi-nor flash
 controller driver

Hi Brian,
   I haven't received more other comments for two weeks since I resent this
patch except a compiling error. Could you help me merge this patch into the
-next tree after I fix the compiling error?  If so, I'll send out the new
version as soon as possible. Thank you very much!

Regards,
Jiancheng

On 2016/6/13 16:21, Jiancheng Xue wrote:
> Add hisilicon spi-nor flash controller driver
> 
> Signed-off-by: Binquan Peng <pengbinquan@...ilicon.com>
> Signed-off-by: Jiancheng Xue <xuejiancheng@...ilicon.com>
> Acked-by: Rob Herring <robh@...nel.org>
> Reviewed-by: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
> ---
> change log
> v11:
> Fixed issues pointed by Brian Norris and Cyrille Pitchen.
> 1)Changed hisi_spi_nor_read_reg()/write_reg() to configure registers
> without sniffing the opcodes.
> 2)Deleted hisi_spi_nor_erase() and used default implementation instead.
> 3)Changed hisi_spi_nor_dma_transfer() to return a integer type value
> instead of nothing.
> 4)Simplified hisi_spi_nor_read()/write() as Brian suggested.
> 
> v10:
> Fixed issues pointed by Marek Vasut.
> 1)Droped the underscores in the argument names of some macros' definition.
> 2)Changed some varibles to correct type.
> 3)Rewrote hisi_spi_nor_read/write for readability.
> 4)Added new functions hisi_spi_nor_register/unregister_all
> 5)Changed to dynamically allocation for spi_nor embeded in hifmc_host.
> Fixed issues pointed by Brian Norris.
> 1)Replaced some headers with more accurate ones.
> v9:
> Fixed issues pointed by Jagan Teki.
> v8:
> Fixed issues pointed by Ezequiel Garcia and Brian Norris.
> Moved dts binding file to mtd directory.
> Changed the compatible string more specific.
> v7:
> Rebased to v4.5-rc3.
> Fixed issues pointed by Ezequiel Garcia.
> v6:
> Based on v4.5-rc2
> Fixed issues pointed by Ezequiel Garcia.
> v5:
> Fixed a compile error.
> v4:
> Rebased to v4.5-rc1
> v3:
> Added a compatible string "hisilicon,hi3519-sfc".
> v2:
> Fixed some compiling warings.
> 
>  .../bindings/mtd/hisilicon,fmc-spi-nor.txt         |  24 +
>  drivers/mtd/spi-nor/Kconfig                        |   7 +
>  drivers/mtd/spi-nor/Makefile                       |   1 +
>  drivers/mtd/spi-nor/hisi-sfc.c                     | 489 +++++++++++++++++++++
>  4 files changed, 521 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mtd/hisilicon,fmc-spi-nor.txt
>  create mode 100644 drivers/mtd/spi-nor/hisi-sfc.c
> 
> diff --git a/Documentation/devicetree/bindings/mtd/hisilicon,fmc-spi-nor.txt b/Documentation/devicetree/bindings/mtd/hisilicon,fmc-spi-nor.txt
> new file mode 100644
> index 0000000..7498152
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/hisilicon,fmc-spi-nor.txt
> @@ -0,0 +1,24 @@
> +HiSilicon SPI-NOR Flash Controller
> +
> +Required properties:
> +- compatible : Should be "hisilicon,fmc-spi-nor" and one of the following strings:
> +		"hisilicon,hi3519-spi-nor"
> +- address-cells : Should be 1.
> +- size-cells : Should be 0.
> +- reg : Offset and length of the register set for the controller device.
> +- reg-names : Must include the following two entries: "control", "memory".
> +- clocks : handle to spi-nor flash controller clock.
> +
> +Example:
> +spi-nor-controller@...00000 {
> +	compatible = "hisilicon,hi3519-spi-nor", "hisilicon,fmc-spi-nor";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	reg = <0x10000000 0x1000>, <0x14000000 0x1000000>;
> +	reg-names = "control", "memory";
> +	clocks = <&clock HI3519_FMC_CLK>;
> +	spi-nor@0 {
> +		compatible = "jedec,spi-nor";
> +		reg = <0>;
> +	};
> +};
> diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
> index d42c98e..b9ff675 100644
> --- a/drivers/mtd/spi-nor/Kconfig
> +++ b/drivers/mtd/spi-nor/Kconfig
> @@ -38,6 +38,13 @@ config SPI_FSL_QUADSPI
>  	  This controller does not support generic SPI. It only supports
>  	  SPI NOR.
>  
> +config SPI_HISI_SFC
> +	tristate "Hisilicon SPI-NOR Flash Controller(SFC)"
> +	depends on ARCH_HISI || COMPILE_TEST
> +	depends on HAS_IOMEM
> +	help
> +	  This enables support for hisilicon SPI-NOR flash controller.
> +
>  config SPI_NXP_SPIFI
>  	tristate "NXP SPI Flash Interface (SPIFI)"
>  	depends on OF && (ARCH_LPC18XX || COMPILE_TEST)
> diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
> index 0bf3a7f8..8a6fa69 100644
> --- a/drivers/mtd/spi-nor/Makefile
> +++ b/drivers/mtd/spi-nor/Makefile
> @@ -1,4 +1,5 @@
>  obj-$(CONFIG_MTD_SPI_NOR)	+= spi-nor.o
>  obj-$(CONFIG_SPI_FSL_QUADSPI)	+= fsl-quadspi.o
> +obj-$(CONFIG_SPI_HISI_SFC)	+= hisi-sfc.o
>  obj-$(CONFIG_MTD_MT81xx_NOR)    += mtk-quadspi.o
>  obj-$(CONFIG_SPI_NXP_SPIFI)	+= nxp-spifi.o
> diff --git a/drivers/mtd/spi-nor/hisi-sfc.c b/drivers/mtd/spi-nor/hisi-sfc.c
> new file mode 100644
> index 0000000..44664c3
> --- /dev/null
> +++ b/drivers/mtd/spi-nor/hisi-sfc.c
> @@ -0,0 +1,489 @@
> +/*
> + * HiSilicon SPI Nor Flash Controller Driver
> + *
> + * Copyright (c) 2015-2016 HiSilicon Technologies Co., Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +#include <linux/bitops.h>
> +#include <linux/clk.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/iopoll.h>
> +#include <linux/module.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/mtd/spi-nor.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +/* Hardware register offsets and field definitions */
> +#define FMC_CFG				0x00
> +#define FMC_CFG_OP_MODE_MASK		BIT_MASK(0)
> +#define FMC_CFG_OP_MODE_BOOT		0
> +#define FMC_CFG_OP_MODE_NORMAL		1
> +#define FMC_CFG_FLASH_SEL(type)		(((type) & 0x3) << 1)
> +#define FMC_CFG_FLASH_SEL_MASK		0x6
> +#define FMC_ECC_TYPE(type)		(((type) & 0x7) << 5)
> +#define FMC_ECC_TYPE_MASK		GENMASK(7, 5)
> +#define SPI_NOR_ADDR_MODE_MASK		BIT_MASK(10)
> +#define SPI_NOR_ADDR_MODE_3BYTES	(0x0 << 10)
> +#define SPI_NOR_ADDR_MODE_4BYTES	(0x1 << 10)
> +#define FMC_GLOBAL_CFG			0x04
> +#define FMC_GLOBAL_CFG_WP_ENABLE	BIT(6)
> +#define FMC_SPI_TIMING_CFG		0x08
> +#define TIMING_CFG_TCSH(nr)		(((nr) & 0xf) << 8)
> +#define TIMING_CFG_TCSS(nr)		(((nr) & 0xf) << 4)
> +#define TIMING_CFG_TSHSL(nr)		((nr) & 0xf)
> +#define CS_HOLD_TIME			0x6
> +#define CS_SETUP_TIME			0x6
> +#define CS_DESELECT_TIME		0xf
> +#define FMC_INT				0x18
> +#define FMC_INT_OP_DONE			BIT(0)
> +#define FMC_INT_CLR			0x20
> +#define FMC_CMD				0x24
> +#define FMC_CMD_CMD1(cmd)		((cmd) & 0xff)
> +#define FMC_ADDRL			0x2c
> +#define FMC_OP_CFG			0x30
> +#define OP_CFG_FM_CS(cs)		((cs) << 11)
> +#define OP_CFG_MEM_IF_TYPE(type)	(((type) & 0x7) << 7)
> +#define OP_CFG_ADDR_NUM(addr)		(((addr) & 0x7) << 4)
> +#define OP_CFG_DUMMY_NUM(dummy)		((dummy) & 0xf)
> +#define FMC_DATA_NUM			0x38
> +#define FMC_DATA_NUM_CNT(cnt)		((cnt) & GENMASK(13, 0))
> +#define FMC_OP				0x3c
> +#define FMC_OP_DUMMY_EN			BIT(8)
> +#define FMC_OP_CMD1_EN			BIT(7)
> +#define FMC_OP_ADDR_EN			BIT(6)
> +#define FMC_OP_WRITE_DATA_EN		BIT(5)
> +#define FMC_OP_READ_DATA_EN		BIT(2)
> +#define FMC_OP_READ_STATUS_EN		BIT(1)
> +#define FMC_OP_REG_OP_START		BIT(0)
> +#define FMC_DMA_LEN			0x40
> +#define FMC_DMA_LEN_SET(len)		((len) & GENMASK(27, 0))
> +#define FMC_DMA_SADDR_D0		0x4c
> +#define HIFMC_DMA_MAX_LEN		(4096)
> +#define HIFMC_DMA_MASK			(HIFMC_DMA_MAX_LEN - 1)
> +#define FMC_OP_DMA			0x68
> +#define OP_CTRL_RD_OPCODE(code)		(((code) & 0xff) << 16)
> +#define OP_CTRL_WR_OPCODE(code)		(((code) & 0xff) << 8)
> +#define OP_CTRL_RW_OP(op)		((op) << 1)
> +#define OP_CTRL_DMA_OP_READY		BIT(0)
> +#define FMC_OP_READ			0x0
> +#define FMC_OP_WRITE			0x1
> +#define FMC_WAIT_TIMEOUT		1000000
> +
> +enum hifmc_iftype {
> +	IF_TYPE_STD,
> +	IF_TYPE_DUAL,
> +	IF_TYPE_DIO,
> +	IF_TYPE_QUAD,
> +	IF_TYPE_QIO,
> +};
> +
> +struct hifmc_priv {
> +	u32 chipselect;
> +	u32 clkrate;
> +	struct hifmc_host *host;
> +};
> +
> +#define HIFMC_MAX_CHIP_NUM		2
> +struct hifmc_host {
> +	struct device *dev;
> +	struct mutex lock;
> +
> +	void __iomem *regbase;
> +	void __iomem *iobase;
> +	struct clk *clk;
> +	void *buffer;
> +	dma_addr_t dma_buffer;
> +
> +	struct spi_nor	*nor[HIFMC_MAX_CHIP_NUM];
> +	u32 num_chip;
> +};
> +
> +static inline int wait_op_finish(struct hifmc_host *host)
> +{
> +	u32 reg;
> +
> +	return readl_poll_timeout(host->regbase + FMC_INT, reg,
> +		(reg & FMC_INT_OP_DONE), 0, FMC_WAIT_TIMEOUT);
> +}
> +
> +static int get_if_type(enum read_mode flash_read)
> +{
> +	enum hifmc_iftype if_type;
> +
> +	switch (flash_read) {
> +	case SPI_NOR_DUAL:
> +		if_type = IF_TYPE_DUAL;
> +		break;
> +	case SPI_NOR_QUAD:
> +		if_type = IF_TYPE_QUAD;
> +		break;
> +	case SPI_NOR_NORMAL:
> +	case SPI_NOR_FAST:
> +	default:
> +		if_type = IF_TYPE_STD;
> +		break;
> +	}
> +
> +	return if_type;
> +}
> +
> +static void hisi_spi_nor_init(struct hifmc_host *host)
> +{
> +	u32 reg;
> +
> +	reg = TIMING_CFG_TCSH(CS_HOLD_TIME)
> +		| TIMING_CFG_TCSS(CS_SETUP_TIME)
> +		| TIMING_CFG_TSHSL(CS_DESELECT_TIME);
> +	writel(reg, host->regbase + FMC_SPI_TIMING_CFG);
> +}
> +
> +static int hisi_spi_nor_prep(struct spi_nor *nor, enum spi_nor_ops ops)
> +{
> +	struct hifmc_priv *priv = nor->priv;
> +	struct hifmc_host *host = priv->host;
> +	int ret;
> +
> +	mutex_lock(&host->lock);
> +
> +	ret = clk_set_rate(host->clk, priv->clkrate);
> +	if (ret)
> +		goto out;
> +
> +	ret = clk_prepare_enable(host->clk);
> +	if (ret)
> +		goto out;
> +
> +	return 0;
> +
> +out:
> +	mutex_unlock(&host->lock);
> +	return ret;
> +}
> +
> +static void hisi_spi_nor_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
> +{
> +	struct hifmc_priv *priv = nor->priv;
> +	struct hifmc_host *host = priv->host;
> +
> +	clk_disable_unprepare(host->clk);
> +	mutex_unlock(&host->lock);
> +}
> +
> +static int hisi_spi_nor_op_reg(struct spi_nor *nor,
> +				u8 opcode, int len, u8 optype)
> +{
> +	struct hifmc_priv *priv = nor->priv;
> +	struct hifmc_host *host = priv->host;
> +	u32 reg;
> +
> +	reg = FMC_CMD_CMD1(opcode);
> +	writel(reg, host->regbase + FMC_CMD);
> +
> +	reg = FMC_DATA_NUM_CNT(len);
> +	writel(reg, host->regbase + FMC_DATA_NUM);
> +
> +	reg = OP_CFG_FM_CS(priv->chipselect);
> +	writel(reg, host->regbase + FMC_OP_CFG);
> +
> +	writel(0xff, host->regbase + FMC_INT_CLR);
> +	reg = FMC_OP_CMD1_EN | FMC_OP_REG_OP_START | optype;
> +	writel(reg, host->regbase + FMC_OP);
> +
> +	return wait_op_finish(host);
> +}
> +
> +static int hisi_spi_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
> +		int len)
> +{
> +	struct hifmc_priv *priv = nor->priv;
> +	struct hifmc_host *host = priv->host;
> +	int ret;
> +
> +	ret = hisi_spi_nor_op_reg(nor, opcode, len, FMC_OP_READ_DATA_EN);
> +	if (ret)
> +		return ret;
> +
> +	memcpy_fromio(buf, host->iobase, len);
> +	return 0;
> +}
> +
> +static int hisi_spi_nor_write_reg(struct spi_nor *nor, u8 opcode,
> +				u8 *buf, int len)
> +{
> +	struct hifmc_priv *priv = nor->priv;
> +	struct hifmc_host *host = priv->host;
> +
> +	if (len)
> +		memcpy_toio(host->iobase, buf, len);
> +
> +	return hisi_spi_nor_op_reg(nor, opcode, len, FMC_OP_WRITE_DATA_EN);
> +}
> +
> +static int hisi_spi_nor_dma_transfer(struct spi_nor *nor, loff_t start_off,
> +		dma_addr_t dma_buf, size_t len, u8 op_type)
> +{
> +	struct hifmc_priv *priv = nor->priv;
> +	struct hifmc_host *host = priv->host;
> +	u8 if_type = 0;
> +	u32 reg;
> +
> +	reg = readl(host->regbase + FMC_CFG);
> +	reg &= ~(FMC_CFG_OP_MODE_MASK | SPI_NOR_ADDR_MODE_MASK);
> +	reg |= FMC_CFG_OP_MODE_NORMAL;
> +	reg |= (nor->addr_width == 4) ? SPI_NOR_ADDR_MODE_4BYTES
> +		: SPI_NOR_ADDR_MODE_3BYTES;
> +	writel(reg, host->regbase + FMC_CFG);
> +
> +	writel(start_off, host->regbase + FMC_ADDRL);
> +	writel(dma_buf, host->regbase + FMC_DMA_SADDR_D0);
> +	writel(FMC_DMA_LEN_SET(len), host->regbase + FMC_DMA_LEN);
> +
> +	reg = OP_CFG_FM_CS(priv->chipselect);
> +	if_type = get_if_type(nor->flash_read);
> +	reg |= OP_CFG_MEM_IF_TYPE(if_type);
> +	if (op_type == FMC_OP_READ)
> +		reg |= OP_CFG_DUMMY_NUM(nor->read_dummy >> 3);
> +	writel(reg, host->regbase + FMC_OP_CFG);
> +
> +	writel(0xff, host->regbase + FMC_INT_CLR);
> +	reg = OP_CTRL_RW_OP(op_type) | OP_CTRL_DMA_OP_READY;
> +	reg |= (op_type == FMC_OP_READ)
> +		? OP_CTRL_RD_OPCODE(nor->read_opcode)
> +		: OP_CTRL_WR_OPCODE(nor->program_opcode);
> +	writel(reg, host->regbase + FMC_OP_DMA);
> +
> +	return wait_op_finish(host);
> +}
> +
> +static int hisi_spi_nor_read(struct spi_nor *nor, loff_t from, size_t len,
> +		size_t *retlen, u_char *read_buf)
> +{
> +	struct hifmc_priv *priv = nor->priv;
> +	struct hifmc_host *host = priv->host;
> +	size_t offset;
> +	int ret;
> +
> +	for (offset = 0; offset < len; offset += HIFMC_DMA_MAX_LEN) {
> +		size_t trans = min_t(size_t, HIFMC_DMA_MAX_LEN, len - offset);
> +
> +		ret = hisi_spi_nor_dma_transfer(nor,
> +			from + offset, host->dma_buffer, trans, FMC_OP_READ);
> +		if (ret) {
> +			dev_warn(nor->dev, "DMA read timeout\n");
> +			return ret;
> +		}
> +		memcpy(read_buf + offset, host->buffer, trans);
> +		*retlen += trans;
> +	}
> +
> +	return 0;
> +}
> +
> +static void hisi_spi_nor_write(struct spi_nor *nor, loff_t to,
> +			size_t len, size_t *retlen, const u_char *write_buf)
> +{
> +	struct hifmc_priv *priv = nor->priv;
> +	struct hifmc_host *host = priv->host;
> +	size_t offset;
> +	int ret;
> +
> +	for (offset = 0; offset < len; offset += HIFMC_DMA_MAX_LEN) {
> +		size_t trans = min_t(size_t, HIFMC_DMA_MAX_LEN, len - offset);
> +
> +		memcpy(host->buffer, write_buf + offset, trans);
> +		ret = hisi_spi_nor_dma_transfer(nor,
> +			to + offset, host->dma_buffer, trans, FMC_OP_WRITE);
> +		if (ret) {
> +			dev_warn(nor->dev, "DMA write timeout\n");
> +			return;
> +		}
> +		*retlen += len;
> +	}
> +}
> +
> +/**
> + * Get spi flash device information and register it as a mtd device.
> + */
> +static int hisi_spi_nor_register(struct device_node *np,
> +				struct hifmc_host *host)
> +{
> +	struct device *dev = host->dev;
> +	struct spi_nor *nor;
> +	struct hifmc_priv *priv;
> +	struct mtd_info *mtd;
> +	int ret;
> +
> +	nor = devm_kzalloc(dev, sizeof(*nor), GFP_KERNEL);
> +	if (!nor)
> +		return -ENOMEM;
> +
> +	nor->dev = dev;
> +	spi_nor_set_flash_node(nor, np);
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	ret = of_property_read_u32(np, "reg", &priv->chipselect);
> +	if (ret) {
> +		dev_err(dev, "There's no reg property for %s\n",
> +			np->full_name);
> +		return ret;
> +	}
> +
> +	ret = of_property_read_u32(np, "spi-max-frequency",
> +			&priv->clkrate);
> +	if (ret) {
> +		dev_err(dev, "There's no spi-max-frequency property for %s\n",
> +			np->full_name);
> +		return ret;
> +	}
> +	priv->host = host;
> +	nor->priv = priv;
> +
> +	nor->prepare = hisi_spi_nor_prep;
> +	nor->unprepare = hisi_spi_nor_unprep;
> +	nor->read_reg = hisi_spi_nor_read_reg;
> +	nor->write_reg = hisi_spi_nor_write_reg;
> +	nor->read = hisi_spi_nor_read;
> +	nor->write = hisi_spi_nor_write;
> +	nor->erase = NULL;
> +	ret = spi_nor_scan(nor, NULL, SPI_NOR_QUAD);
> +	if (ret)
> +		return ret;
> +
> +	mtd = &nor->mtd;
> +	mtd->name = np->name;
> +	ret = mtd_device_register(mtd, NULL, 0);
> +	if (ret)
> +		return ret;
> +
> +	host->nor[host->num_chip] = nor;
> +	host->num_chip++;
> +	return 0;
> +}
> +
> +static void hisi_spi_nor_unregister_all(struct hifmc_host *host)
> +{
> +	int i;
> +
> +	for (i = 0; i < host->num_chip; i++)
> +		mtd_device_unregister(&host->nor[i]->mtd);
> +}
> +
> +static int hisi_spi_nor_register_all(struct hifmc_host *host)
> +{
> +	struct device *dev = host->dev;
> +	struct device_node *np;
> +	int ret;
> +
> +	for_each_available_child_of_node(dev->of_node, np) {
> +		ret = hisi_spi_nor_register(np, host);
> +		if (ret)
> +			goto fail;
> +
> +		if (host->num_chip == HIFMC_MAX_CHIP_NUM) {
> +			dev_warn(dev, "Flash device number exceeds the maximum chipselect number\n");
> +			break;
> +		}
> +	}
> +
> +	return 0;
> +
> +fail:
> +	hisi_spi_nor_unregister_all(host);
> +	return ret;
> +}
> +
> +static int hisi_spi_nor_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct resource *res;
> +	struct hifmc_host *host;
> +	int ret;
> +
> +	host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
> +	if (!host)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, host);
> +	host->dev = dev;
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control");
> +	host->regbase = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(host->regbase))
> +		return PTR_ERR(host->regbase);
> +
> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "memory");
> +	host->iobase = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(host->iobase))
> +		return PTR_ERR(host->iobase);
> +
> +	host->clk = devm_clk_get(dev, NULL);
> +	if (IS_ERR(host->clk))
> +		return PTR_ERR(host->clk);
> +
> +	ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
> +	if (ret) {
> +		dev_warn(dev, "Unable to set dma mask\n");
> +		return ret;
> +	}
> +
> +	host->buffer = dmam_alloc_coherent(dev, HIFMC_DMA_MAX_LEN,
> +			&host->dma_buffer, GFP_KERNEL);
> +	if (!host->buffer)
> +		return -ENOMEM;
> +
> +	mutex_init(&host->lock);
> +	clk_prepare_enable(host->clk);
> +	hisi_spi_nor_init(host);
> +	ret = hisi_spi_nor_register_all(host);
> +	if (ret)
> +		mutex_destroy(&host->lock);
> +
> +	clk_disable_unprepare(host->clk);
> +	return ret;
> +}
> +
> +static int hisi_spi_nor_remove(struct platform_device *pdev)
> +{
> +	struct hifmc_host *host = platform_get_drvdata(pdev);
> +
> +	hisi_spi_nor_unregister_all(host);
> +	mutex_destroy(&host->lock);
> +	clk_disable_unprepare(host->clk);
> +	return 0;
> +}
> +
> +static const struct of_device_id hisi_spi_nor_dt_ids[] = {
> +	{ .compatible = "hisilicon,fmc-spi-nor"},
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, hisi_spi_nor_dt_ids);
> +
> +static struct platform_driver hisi_spi_nor_driver = {
> +	.driver = {
> +		.name	= "hisi-sfc",
> +		.of_match_table = hisi_spi_nor_dt_ids,
> +	},
> +	.probe	= hisi_spi_nor_probe,
> +	.remove	= hisi_spi_nor_remove,
> +};
> +module_platform_driver(hisi_spi_nor_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("HiSilicon SPI Nor Flash Controller Driver");
> 

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