Message-ID: <1441705796-11365-3-git-send-email-bayi.cheng@mediatek.com>
Date:	Tue, 8 Sep 2015 17:49:55 +0800
From:	Bayi Cheng <bayi.cheng@...iatek.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
	Bayi Cheng <bayi.cheng@...iatek.com>
Subject: [PATCH 2/3] mtd: mtk-nor: mtk serial flash controller driver

add spi nor flash driver for mediatek controller

Signed-off-by: Bayi Cheng <bayi.cheng@...iatek.com>
---
 drivers/mtd/spi-nor/Kconfig   |   7 +
 drivers/mtd/spi-nor/Makefile  |   1 +
 drivers/mtd/spi-nor/mtk_nor.c | 533 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 541 insertions(+)
 create mode 100644 drivers/mtd/spi-nor/mtk_nor.c

diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
index 89bf4c1..f433890 100644
--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -7,6 +7,13 @@ menuconfig MTD_SPI_NOR
 
 if MTD_SPI_NOR
 
+config MTD_MT81xx_NOR
+	tristate "Support SPI flash Controller MTD_MT81xx_NOR"
+	help
+	  This enables access to SPI Nor flash, using MTD_MT81XX_NOR controller.
+	  This controller does nor support generic SPI BUS, It only supports
+	  SPI NOR Flash.
+
 config MTD_SPI_NOR_USE_4K_SECTORS
 	bool "Use small 4096 B erase sectors"
 	default y
diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
index e53333e..2f4fe62 100644
--- a/drivers/mtd/spi-nor/Makefile
+++ b/drivers/mtd/spi-nor/Makefile
@@ -1,3 +1,4 @@
+obj-$(CONFIG_MTD_MT81xx_NOR)	+= mtk_nor.o
 obj-$(CONFIG_MTD_SPI_NOR)	+= spi-nor.o
 obj-$(CONFIG_SPI_FSL_QUADSPI)	+= fsl-quadspi.o
 obj-$(CONFIG_SPI_NXP_SPIFI)	+= nxp-spifi.o
diff --git a/drivers/mtd/spi-nor/mtk_nor.c b/drivers/mtd/spi-nor/mtk_nor.c
new file mode 100644
index 0000000..e675fb6
--- /dev/null
+++ b/drivers/mtd/spi-nor/mtk_nor.c
@@ -0,0 +1,533 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author: Bayi.Cheng <bayi.cheng@...iatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/ioport.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/spi-nor.h>
+
+#define MTK_NOR_CMD_REG			0x00
+#define MTK_NOR_CNT_REG			0x04
+#define MTK_NOR_RDSR_REG		0x08
+#define MTK_NOR_RDATA_REG		0x0c
+#define MTK_NOR_RADR0_REG		0x10
+#define MTK_NOR_RADR1_REG		0x14
+#define MTK_NOR_RADR2_REG		0x18
+#define MTK_NOR_WDATA_REG		0x1c
+#define MTK_NOR_PRGDATA0_REG		0x20
+#define MTK_NOR_PRGDATA1_REG		0x24
+#define MTK_NOR_PRGDATA2_REG		0x28
+#define MTK_NOR_PRGDATA3_REG		0x2c
+#define MTK_NOR_PRGDATA4_REG		0x30
+#define MTK_NOR_PRGDATA5_REG		0x34
+#define MTK_NOR_SHREG0_REG		0x38
+#define MTK_NOR_SHREG1_REG		0x3c
+#define MTK_NOR_SHREG2_REG		0x40
+#define MTK_NOR_SHREG3_REG		0x44
+#define MTK_NOR_SHREG4_REG		0x48
+#define MTK_NOR_SHREG5_REG		0x4c
+#define MTK_NOR_SHREG6_REG		0x50
+#define MTK_NOR_SHREG7_REG		0x54
+#define MTK_NOR_SHREG8_REG		0x58
+#define MTK_NOR_SHREG9_REG		0x5c
+#define MTK_NOR_FLHCFG_REG		0x84
+#define MTK_NOR_PP_DATA_REG		0x98
+#define MTK_NOR_PREBUF_STUS_REG		0x9c
+#define MTK_NOR_INTRSTUS_REG		0xa8
+#define MTK_NOR_INTREN_REG		0xac
+#define MTK_NOR_TIME_REG		0x94
+#define MTK_NOR_CHKSUM_CTL_REG		0xb8
+#define MTK_NOR_CHKSUM_REG		0xbc
+#define MTK_NOR_CMD2_REG		0xc0
+#define MTK_NOR_WRPROT_REG		0xc4
+#define MTK_NOR_RADR3_REG		0xc8
+#define MTK_NOR_DUAL_REG		0xcc
+#define MTK_NOR_DELSEL0_REG		0xa0
+#define MTK_NOR_DELSEL1_REG		0xa4
+#define MTK_NOR_DELSEL2_REG		0xd0
+#define MTK_NOR_DELSEL3_REG		0xd4
+#define MTK_NOR_DELSEL4_REG		0xd8
+#define MTK_NOR_CFG1_REG		0x60
+#define MTK_NOR_CFG2_REG		0x64
+#define MTK_NOR_CFG3_REG		0x68
+#define MTK_NOR_STATUS0_REG		0x70
+#define MTK_NOR_STATUS1_REG		0x74
+#define MTK_NOR_STATUS2_REG		0x78
+#define MTK_NOR_STATUS3_REG		0x7c
+/* commands for mtk nor controller */
+#define MTK_NOR_READ_CMD		0x0
+#define MTK_NOR_RDSR_CMD		0x2
+#define MTK_NOR_PRG_CMD			0x4
+#define MTK_NOR_WR_CMD			0x10
+#define MTK_NOR_WRSR_CMD		0x20
+#define MTK_NOR_PIO_READ_CMD		0x81
+#define MTK_NOR_WR_BUF_ENABLE		0x1
+#define MTK_NOR_WR_BUF_DISABLE		0x0
+#define MTK_NOR_ENABLE_SF_CMD		0x30
+#define MTK_NOR_DUAD_ADDR_EN		0x8
+#define MTK_NOR_QUAD_READ_EN		0x4
+#define MTK_NOR_DUAL_ADDR_EN		0x2
+#define MTK_NOR_DUAL_READ_EN		0x1
+#define MTK_NOR_DUAL_DISABLE		0x0
+#define MTK_NOR_FAST_READ		0x1
+
+#define SFLASH_WRBUF_SIZE		128
+#define MAX_FLASHCOUNT			1
+#define SFLASHHWNAME_LEN		12
+#define SFLASH_MAX_DMA_SIZE		(1024 * 8)
+
+#define LoWord(d)		((u16)(d & 0x0000ffffL))
+#define HiWord(d)		((u16)((d >> 16) & 0x0000ffffL))
+#define LoByte(w)		((u8)(w & 0x00ff))
+#define HiByte(w)		((u8)(((w) >> 8) & 0x00ff))
+#define LOCAL_BUF_SIZE		(SFLASH_MAX_DMA_SIZE * 20)
+
+struct mt8173_nor {
+	struct mtd_info mtd;
+	struct spi_nor nor;
+	struct device *dev;
+	void __iomem *base;	/* nor flash base address */
+	struct clk *spi_clk;
+	struct clk *src_axi_clk;
+	struct clk *sf_mux_clk;
+	struct clk *nor_clk;
+};
+
+static void mt8173_nor_set_read_mode(struct mt8173_nor *mt8173_nor)
+{
+	struct spi_nor *nor = &mt8173_nor->nor;
+
+	switch (nor->flash_read) {
+	case SPI_NOR_FAST:
+		writeb(SPINOR_OP_READ_FAST, mt8173_nor->base +
+		       MTK_NOR_PRGDATA3_REG);
+		writeb(MTK_NOR_FAST_READ, mt8173_nor->base +
+		       MTK_NOR_CFG1_REG);
+		break;
+	case SPI_NOR_DUAL:
+		writeb(SPINOR_OP_READ_1_1_2, mt8173_nor->base +
+		       MTK_NOR_PRGDATA3_REG);
+		writeb(MTK_NOR_DUAL_READ_EN, mt8173_nor->base +
+		       MTK_NOR_DUAL_REG);
+		break;
+	case SPI_NOR_QUAD:
+		writeb(SPINOR_OP_READ_1_1_4, mt8173_nor->base +
+		       MTK_NOR_PRGDATA3_REG);
+		writeb(MTK_NOR_QUAD_READ_EN, mt8173_nor->base +
+		       MTK_NOR_DUAL_REG);
+		break;
+	default:
+		writeb(SPINOR_OP_READ, mt8173_nor->base +
+		       MTK_NOR_PRGDATA3_REG);
+		writeb(MTK_NOR_DUAL_DISABLE, mt8173_nor->base +
+		       MTK_NOR_DUAL_REG);
+		break;
+	}
+}
+
+static int mt8173_nor_polling_reg(struct mt8173_nor *mt8173_nor, int compare)
+{
+	int reg, ret;
+
+	ret =  readl_poll_timeout(mt8173_nor->base + MTK_NOR_CMD_REG, reg,
+				  !(reg & compare), 100, 10000);
+	if (ret)
+		dev_err(mt8173_nor->dev, "compare val%02X timeout!\n", compare);
+	return ret;
+}
+
+static int mt8173_nor_execute_cmd(struct mt8173_nor *mt8173_nor, u8 cmdval)
+{
+	u8 val = cmdval & 0x1f;
+
+	writeb(cmdval, mt8173_nor->base + MTK_NOR_CMD_REG);
+	return mt8173_nor_polling_reg(mt8173_nor, val);
+}
+
+static int mt8173_nor_set_cmd(struct mt8173_nor *mt8173_nor, int addr,
+			      int len, int op)
+{
+	writeb(op, mt8173_nor->base + MTK_NOR_PRGDATA5_REG);
+	/* reset the following register */
+	writeb(LoByte(HiWord(addr)), mt8173_nor->base + MTK_NOR_PRGDATA4_REG);
+	writeb(HiByte(LoWord(addr)), mt8173_nor->base + MTK_NOR_PRGDATA3_REG);
+	writeb(LoByte(LoWord(addr)), mt8173_nor->base + MTK_NOR_PRGDATA2_REG);
+	writeb(len, mt8173_nor->base + MTK_NOR_CNT_REG);
+	return mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_PRG_CMD);
+}
+
+static int mt8173_nor_get_para(struct mt8173_nor *mt8173_nor, u8 *buf, int len)
+{
+	if (len > 1) {
+		/* read JEDEC ID need 4 bytes commands */
+		mt8173_nor_set_cmd(mt8173_nor, 0, 32, SPINOR_OP_RDID);
+		buf[2] = readb(mt8173_nor->base + MTK_NOR_SHREG0_REG);
+		buf[1] = readb(mt8173_nor->base + MTK_NOR_SHREG1_REG);
+		buf[0] = readb(mt8173_nor->base + MTK_NOR_SHREG2_REG);
+	} else {
+		if (mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_RDSR_CMD)) {
+			dev_err(mt8173_nor->dev, "read status failed!\n");
+			return -EINVAL;
+		}
+		*buf = readb(mt8173_nor->base + MTK_NOR_RDSR_REG);
+	}
+	return 0;
+}
+
+/* cmd1 sent to nor flash, cmd2 write to nor controller */
+static int mt8173_nor_set_para(struct mt8173_nor *mt8173_nor, int cmd1,
+			       int cmd2)
+{
+	if (mt8173_nor_set_cmd(mt8173_nor, 0, 8, SPINOR_OP_WREN)) {
+		dev_err(mt8173_nor->dev,
+			"write enable failed in write protect!\n");
+		return -EINVAL;
+	}
+	writeb(cmd1, mt8173_nor->base + MTK_NOR_PRGDATA5_REG);
+	writeb(8, mt8173_nor->base + MTK_NOR_CNT_REG);
+	if (mt8173_nor_execute_cmd(mt8173_nor, cmd2)) {
+		dev_err(mt8173_nor->dev, "execute cmd failed!\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int mt8173_nor_write_buffer_enable(struct mt8173_nor *mt8173_nor)
+{
+	u8 reg, ret;
+
+	writel(MTK_NOR_WR_BUF_ENABLE, mt8173_nor->base + MTK_NOR_CFG2_REG);
+	ret =  readb_poll_timeout(mt8173_nor->base + MTK_NOR_CFG2_REG, reg,
+				  0x01 == (reg & 0x01), 100, 10000);
+	if (ret)
+		dev_err(mt8173_nor->dev, "timeout!\n");
+	return ret;
+}
+
+static int mt8173_nor_write_buffer_disable(struct mt8173_nor *mt8173_nor)
+{
+	u8 reg, ret;
+
+	writel(MTK_NOR_WR_BUF_DISABLE, mt8173_nor->base + MTK_NOR_CFG2_REG);
+	ret =  readb_poll_timeout(mt8173_nor->base + MTK_NOR_CFG2_REG, reg,
+				  MTK_NOR_WR_BUF_DISABLE == (reg & 0xf), 100,
+				  10000);
+	if (ret)
+		dev_err(mt8173_nor->dev, "compare timeout!\n");
+	return ret;
+}
+
+static int mt8173_nor_erase_sector(struct spi_nor *nor, loff_t offset)
+{
+	struct mt8173_nor *mt8173_nor = nor->priv;
+
+	if (mt8173_nor_set_cmd(mt8173_nor, 0, 8, SPINOR_OP_WREN)) {
+		dev_err(mt8173_nor->dev,
+			"write enable failed in erase sector!\n");
+		return -EINVAL;
+	}
+
+	mt8173_nor_set_cmd(mt8173_nor, (int)offset, 32, SPINOR_OP_BE_4K);
+	return 0;
+}
+
+static int mt8173_nor_read_hw(struct mt8173_nor *mt8173_nor, int addr, int len,
+			      int *retlen, u8 *buf)
+{
+	int ret = 0, i;
+
+	mt8173_nor_set_read_mode(mt8173_nor);
+	writeb(HiByte(HiWord(addr)), mt8173_nor->base + MTK_NOR_RADR3_REG);
+	writeb(LoByte(HiWord(addr)), mt8173_nor->base + MTK_NOR_RADR2_REG);
+	writeb(HiByte(LoWord(addr)), mt8173_nor->base + MTK_NOR_RADR1_REG);
+	writeb(LoByte(LoWord(addr)), mt8173_nor->base + MTK_NOR_RADR0_REG);
+
+	for (i = 0; i < len; i++, (*retlen)++) {
+		if (mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_PIO_READ_CMD)) {
+			dev_err(mt8173_nor->dev, "read flash failed!\n");
+			return -EINVAL;
+		}
+		buf[i] = readb(mt8173_nor->base + MTK_NOR_RDATA_REG);
+	}
+	return ret;
+}
+
+static int mt8173_nor_read(struct spi_nor *nor, loff_t from, size_t len,
+			   size_t *retlen, u_char *buf)
+{
+	struct mt8173_nor *mt8173_nor = nor->priv;
+
+	return mt8173_nor_read_hw(mt8173_nor, (int)from, (int)len,
+				 (int *)retlen, (u8 *)buf);
+}
+
+static int mt8173_nor_write_single_byte(struct mt8173_nor *mt8173_nor,
+					int u4addr, u8 u1data)
+{
+	if (u4addr >= mt8173_nor->mtd.size) {
+		dev_err(mt8173_nor->dev, "invalid write address!\n");
+		return -EINVAL;
+	}
+
+	writeb(u1data, mt8173_nor->base + MTK_NOR_WDATA_REG);
+	writeb(LoByte(HiWord(u4addr)), mt8173_nor->base + MTK_NOR_RADR2_REG);
+	writeb(HiByte(LoWord(u4addr)), mt8173_nor->base + MTK_NOR_RADR1_REG);
+	writeb(LoByte(LoWord(u4addr)), mt8173_nor->base + MTK_NOR_RADR0_REG);
+
+	if (mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_WR_CMD)) {
+		dev_err(mt8173_nor->dev, "write byte offset%08x\n", u4addr);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int mt8173_nor_write_buffer(struct mt8173_nor *mt8173_nor, int u4addr,
+				   int u4len, const u8 *buf)
+{
+	int i, j, bufidx, data;
+
+	if (!buf)
+		return -EINVAL;
+
+	writeb(LoByte(HiWord(u4addr)), mt8173_nor->base + MTK_NOR_RADR2_REG);
+	writeb(HiByte(LoWord(u4addr)), mt8173_nor->base + MTK_NOR_RADR1_REG);
+	writeb(LoByte(LoWord(u4addr)), mt8173_nor->base + MTK_NOR_RADR0_REG);
+
+	bufidx = 0;
+	for (i = 0; i < u4len; i += 4) {
+		for (j = 0; j < 4; j++) {
+			(*((u8 *)&data + j)) = buf[bufidx];
+			bufidx++;
+		}
+		writel(data, mt8173_nor->base + MTK_NOR_PP_DATA_REG);
+	}
+
+	if (mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_WR_CMD)) {
+		dev_err(mt8173_nor->dev, "write buffer offset:%08x\n", u4addr);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void mt8173_nor_write(struct spi_nor *nor, loff_t to, size_t len,
+			     size_t *retlen, const u_char *buf)
+{
+	struct mt8173_nor *mt8173_nor = nor->priv;
+	size_t i;
+
+	if (nor->page_size == len) {
+		if (mt8173_nor_write_buffer_enable(mt8173_nor))
+			dev_err(mt8173_nor->dev, "write buffer enable failed !\n");
+		while (len > 0) {
+			mt8173_nor_write_buffer(mt8173_nor, to,
+						SFLASH_WRBUF_SIZE, buf);
+			len -= SFLASH_WRBUF_SIZE;
+			to += SFLASH_WRBUF_SIZE;
+			buf += SFLASH_WRBUF_SIZE;
+			(*retlen) += SFLASH_WRBUF_SIZE;
+		}
+		if (mt8173_nor_write_buffer_disable(mt8173_nor))
+			dev_err(mt8173_nor->dev, "write buffer disable failed !\n");
+	} else {
+		for (i = 0; i < len; i++,  (*retlen)++) {
+			if (mt8173_nor_write_single_byte(mt8173_nor, to, *buf))
+				dev_err(mt8173_nor->dev, "write byte failed !\n");
+			to++;
+			buf++;
+		}
+	}
+}
+
+static int mt8173_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+{
+	int ret = 0;
+	struct mt8173_nor *mt8173_nor = nor->priv;
+	/* mtk nor controller haven't supoort SPINOR_OP_RDCR */
+	if (opcode == SPINOR_OP_RDID || opcode == SPINOR_OP_RDSR)
+		ret = mt8173_nor_get_para(mt8173_nor, buf, len);
+	else
+		dev_warn(mt8173_nor->dev, "invalid cmd %d\n", opcode);
+
+	return ret;
+}
+
+static int mt8173_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
+				int len, int write_enable)
+{
+	int ret, cmd_to_nor, cmd_to_controller;
+	struct mt8173_nor *mt8173_nor = nor->priv;
+
+	if (opcode == SPINOR_OP_WRSR || opcode == SPINOR_OP_CHIP_ERASE) {
+		if (len > 0) {
+			cmd_to_nor = *buf;
+			cmd_to_controller = MTK_NOR_WRSR_CMD;
+		} else {
+			cmd_to_nor = opcode;
+			cmd_to_controller = MTK_NOR_PRG_CMD;
+		}
+		ret = mt8173_nor_set_para(mt8173_nor, cmd_to_nor,
+					  cmd_to_controller);
+	} else if (opcode == SPINOR_OP_WREN || opcode == SPINOR_OP_WRDI) {
+		ret = mt8173_nor_set_cmd(mt8173_nor, 0, 8, opcode);
+	} else {
+		dev_warn(mt8173_nor->dev, "have not support cmd %d\n", opcode);
+		ret = -EINVAL;
+	}
+	return ret;
+}
+
+static int __init mtk_nor_init(struct mt8173_nor *mt8173_nor,
+			       struct mtd_part_parser_data ppdata)
+{
+	int ret;
+	struct spi_nor *nor;
+	struct mtd_info *mtd;
+
+	writel(MTK_NOR_ENABLE_SF_CMD, mt8173_nor->base + MTK_NOR_WRPROT_REG);
+	nor = &mt8173_nor->nor;
+	mtd = &mt8173_nor->mtd;
+	nor->mtd = mt8173_nor->mtd;
+	nor->dev = mt8173_nor->dev;
+	nor->priv = mt8173_nor;
+	mtd->priv = nor;
+
+	/* fill the hooks to spi nor */
+	nor->read = mt8173_nor_read;
+	nor->read_reg = mt8173_nor_read_reg;
+	nor->write = mt8173_nor_write;
+	nor->write_reg = mt8173_nor_write_reg;
+	nor->erase = mt8173_nor_erase_sector;
+	nor->mtd.owner = THIS_MODULE;
+	nor->mtd.name = "mtk_nor";
+	/* initialized with NULL */
+	ret = spi_nor_scan(nor, NULL, SPI_NOR_DUAL);
+	if (ret) {
+		dev_err(mt8173_nor->dev, "spi_nor_scan failed !\n");
+		return -EINVAL;
+	}
+	dev_dbg(mt8173_nor->dev, "mtd->size :0x%llx!\n", mtd->size);
+	ret = mtd_device_parse_register(&nor->mtd, NULL, &ppdata, NULL, 0);
+
+	return ret;
+}
+
+static int mtk_nor_drv_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct mtd_part_parser_data ppdata;
+	struct resource *res;
+	int ret;
+	struct mt8173_nor *mt8173_nor = devm_kzalloc(&pdev->dev,
+		sizeof(*mt8173_nor), GFP_KERNEL);
+
+	if (!pdev->dev.of_node) {
+		dev_err(&pdev->dev, "No DT found\n");
+		return -EINVAL;
+	}
+
+	if (!mt8173_nor)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, mt8173_nor);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mt8173_nor->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mt8173_nor->base)) {
+		ret = PTR_ERR(mt8173_nor->base);
+		goto nor_free;
+	}
+
+	mt8173_nor->spi_clk = devm_clk_get(&pdev->dev, "spi_clk");
+	if (IS_ERR(mt8173_nor->spi_clk)) {
+		ret = PTR_ERR(mt8173_nor->spi_clk);
+		goto nor_free;
+	}
+
+	mt8173_nor->src_axi_clk = devm_clk_get(&pdev->dev, "axi_clk");
+	if (IS_ERR(mt8173_nor->src_axi_clk)) {
+		ret = PTR_ERR(mt8173_nor->src_axi_clk);
+		goto nor_free;
+	}
+
+	mt8173_nor->sf_mux_clk = devm_clk_get(&pdev->dev, "mux_clk");
+	if (IS_ERR(mt8173_nor->sf_mux_clk)) {
+		ret = PTR_ERR(mt8173_nor->sf_mux_clk);
+		goto nor_free;
+	}
+
+	mt8173_nor->nor_clk = devm_clk_get(&pdev->dev, "sf_clk");
+	if (IS_ERR(mt8173_nor->nor_clk)) {
+		ret = PTR_ERR(mt8173_nor->nor_clk);
+		goto nor_free;
+	}
+
+	mt8173_nor->dev = &pdev->dev;
+	clk_prepare_enable(mt8173_nor->spi_clk);
+	clk_prepare_enable(mt8173_nor->src_axi_clk);
+	clk_prepare_enable(mt8173_nor->sf_mux_clk);
+	clk_prepare_enable(mt8173_nor->nor_clk);
+	clk_set_parent(mt8173_nor->nor_clk, mt8173_nor->sf_mux_clk);
+
+	ppdata.of_node = np;
+	ret = mtk_nor_init(mt8173_nor, ppdata);
+
+nor_free:
+	return ret;
+}
+
+static int mtk_nor_drv_remove(struct platform_device *pdev)
+{
+	struct mt8173_nor *mt8173_nor = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(mt8173_nor->spi_clk);
+	clk_disable_unprepare(mt8173_nor->src_axi_clk);
+	clk_disable_unprepare(mt8173_nor->sf_mux_clk);
+	clk_disable_unprepare(mt8173_nor->nor_clk);
+	mtd_device_unregister(&mt8173_nor->mtd);
+	return 0;
+}
+
+static const struct of_device_id mtk_nor_of_ids[] = {
+	{ .compatible = "mediatek,mt8173-nor"},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mtk_nor_of_ids);
+
+static struct platform_driver mtk_nor_driver = {
+	.probe = mtk_nor_drv_probe,
+	.remove = mtk_nor_drv_remove,
+	.driver = {
+		.name = "mtk-nor",
+		.of_match_table = mtk_nor_of_ids,
+	},
+};
+
+module_platform_driver(mtk_nor_driver);
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MediaTek SPI NOR Flash Driver");
-- 
1.8.1.1.dirty

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