[PATCH v4 1/6] mtd: nand: vf610_nfc: Freescale NFC for VF610, MPC5125 and others
From: Stefan Agner
Date: Wed Mar 25 2015 - 12:29:48 EST
This driver supports Freescale NFC (NAND flash controller) found on
Vybrid (VF610), MPC5125, MCF54418 and Kinetis K70.
Limitations:
- DMA and pipelining not used
- Pages larger than 2k are not supported
- No hardware ECC
The driver has only been tested on Vybrid (VF610).
Signed-off-by: Bill Pringlemeir <bpringlemeir@xxxxxxxxx>
Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
---
MAINTAINERS | 6 +
drivers/mtd/nand/Kconfig | 12 +
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/vf610_nfc.c | 686 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 705 insertions(+)
create mode 100644 drivers/mtd/nand/vf610_nfc.c
diff --git a/MAINTAINERS b/MAINTAINERS
index eaf9996..d8cbaee 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10363,6 +10363,12 @@ S: Maintained
F: Documentation/fb/uvesafb.txt
F: drivers/video/fbdev/uvesafb.*
+VF610 NAND DRIVER
+M: Stefan Agner <stefan@xxxxxxxx>
+L: linux-mtd@xxxxxxxxxxxxxxxxxxx
+S: Supported
+F: drivers/mtd/nand/vf610_nfc.c
+
VFAT/FAT/MSDOS FILESYSTEM
M: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
S: Maintained
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 5b76a17..d0badda 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -455,6 +455,18 @@ config MTD_NAND_MPC5121_NFC
This enables the driver for the NAND flash controller on the
MPC5121 SoC.
+config HAVE_NAND_VF610_NFC
+ bool
+
+config MTD_NAND_VF610_NFC
+ tristate "Support for Freescale NFC for VF610/MPC5125"
+ depends on (HAVE_NAND_VF610_NFC || COMPILE_TEST)
+ help
+ Enables support for NAND Flash Controller on some Freescale
+ processors like the VF610, MPC5125, MCF54418 or Kinetis K70.
+ The driver supports a maximum 2k page size. The driver
+ currently does not support hardware ECC.
+
config MTD_NAND_MXC
tristate "MXC NAND support"
depends on ARCH_MXC
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 582bbd05..e97ca7b 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_MTD_NAND_SOCRATES) += socrates_nand.o
obj-$(CONFIG_MTD_NAND_TXX9NDFMC) += txx9ndfmc.o
obj-$(CONFIG_MTD_NAND_NUC900) += nuc900_nand.o
obj-$(CONFIG_MTD_NAND_MPC5121_NFC) += mpc5121_nfc.o
+obj-$(CONFIG_MTD_NAND_VF610_NFC) += vf610_nfc.o
obj-$(CONFIG_MTD_NAND_RICOH) += r852.o
obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/
diff --git a/drivers/mtd/nand/vf610_nfc.c b/drivers/mtd/nand/vf610_nfc.c
new file mode 100644
index 0000000..23c1510
--- /dev/null
+++ b/drivers/mtd/nand/vf610_nfc.c
@@ -0,0 +1,686 @@
+/*
+ * Copyright 2009-2015 Freescale Semiconductor, Inc. and others
+ *
+ * Description: MPC5125, VF610, MCF54418 and Kinetis K70 Nand driver.
+ * Jason ported to M54418TWR and MVFA5 (VF610).
+ * Authors: Stefan Agner <stefan.agner@xxxxxxxxxxx>
+ * Bill Pringlemeir <bpringlemeir@xxxxxxxxx>
+ * Shaohui Xie <b21989@xxxxxxxxxxxxx>
+ * Jason Jin <Jason.jin@xxxxxxxxxxxxx>
+ *
+ * Based on original driver mpc5121_nfc.c.
+ *
+ * This 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.
+ *
+ * Limitations:
+ * - Untested on MPC5125 and M54418.
+ * - DMA not used.
+ * - 2K pages or less.
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of_mtd.h>
+
+#define DRV_NAME "vf610_nfc"
+
+/* Register Offsets */
+#define NFC_FLASH_CMD1 0x3F00
+#define NFC_FLASH_CMD2 0x3F04
+#define NFC_COL_ADDR 0x3F08
+#define NFC_ROW_ADDR 0x3F0c
+#define NFC_ROW_ADDR_INC 0x3F14
+#define NFC_FLASH_STATUS1 0x3F18
+#define NFC_FLASH_STATUS2 0x3F1c
+#define NFC_CACHE_SWAP 0x3F28
+#define NFC_SECTOR_SIZE 0x3F2c
+#define NFC_FLASH_CONFIG 0x3F30
+#define NFC_IRQ_STATUS 0x3F38
+
+/* Addresses for NFC MAIN RAM BUFFER areas */
+#define NFC_MAIN_AREA(n) ((n) * 0x1000)
+
+#define PAGE_2K 0x0800
+#define OOB_64 0x0040
+
+/*
+ * NFC_CMD2[CODE] values. See section:
+ * - 31.4.7 Flash Command Code Description, Vybrid manual
+ * - 23.8.6 Flash Command Sequencer, MPC5125 manual
+ *
+ * Briefly these are bitmasks of controller cycles.
+ */
+#define READ_PAGE_CMD_CODE 0x7EE0
+#define PROGRAM_PAGE_CMD_CODE 0x7FC0
+#define ERASE_CMD_CODE 0x4EC0
+#define READ_ID_CMD_CODE 0x4804
+#define RESET_CMD_CODE 0x4040
+#define STATUS_READ_CMD_CODE 0x4068
+
+/* NFC ECC mode define */
+#define ECC_BYPASS 0
+
+/*** Register Mask and bit definitions */
+
+/* NFC_FLASH_CMD1 Field */
+#define CMD_BYTE2_MASK 0xFF000000
+#define CMD_BYTE2_SHIFT 24
+
+/* NFC_FLASH_CM2 Field */
+#define CMD_BYTE1_MASK 0xFF000000
+#define CMD_BYTE1_SHIFT 24
+#define CMD_CODE_MASK 0x00FFFF00
+#define CMD_CODE_SHIFT 8
+#define BUFNO_MASK 0x00000006
+#define BUFNO_SHIFT 1
+#define START_BIT (1<<0)
+
+/* NFC_COL_ADDR Field */
+#define COL_ADDR_MASK 0x0000FFFF
+#define COL_ADDR_SHIFT 0
+
+/* NFC_ROW_ADDR Field */
+#define ROW_ADDR_MASK 0x00FFFFFF
+#define ROW_ADDR_SHIFT 0
+#define ROW_ADDR_CHIP_SEL_RB_MASK 0xF0000000
+#define ROW_ADDR_CHIP_SEL_RB_SHIFT 28
+#define ROW_ADDR_CHIP_SEL_MASK 0x0F000000
+#define ROW_ADDR_CHIP_SEL_SHIFT 24
+
+/* NFC_FLASH_STATUS2 Field */
+#define STATUS_BYTE1_MASK 0x000000FF
+
+/* NFC_FLASH_CONFIG Field */
+#define CONFIG_ECC_SRAM_REQ_BIT (1<<21)
+#define CONFIG_DMA_REQ_BIT (1<<20)
+#define CONFIG_ECC_MODE_MASK 0x000E0000
+#define CONFIG_ECC_MODE_SHIFT 17
+#define CONFIG_FAST_FLASH_BIT (1<<16)
+#define CONFIG_16BIT (1<<7)
+#define CONFIG_BOOT_MODE_BIT (1<<6)
+#define CONFIG_ADDR_AUTO_INCR_BIT (1<<5)
+#define CONFIG_BUFNO_AUTO_INCR_BIT (1<<4)
+#define CONFIG_PAGE_CNT_MASK 0xF
+#define CONFIG_PAGE_CNT_SHIFT 0
+
+/* NFC_IRQ_STATUS Field */
+#define IDLE_IRQ_BIT (1<<29)
+#define IDLE_EN_BIT (1<<20)
+#define CMD_DONE_CLEAR_BIT (1<<18)
+#define IDLE_CLEAR_BIT (1<<17)
+
+#define NFC_TIMEOUT (HZ)
+
+struct vf610_nfc_config {
+ int width;
+ int flash_bbt;
+};
+
+struct vf610_nfc {
+ struct mtd_info mtd;
+ struct nand_chip chip;
+ struct device *dev;
+ void __iomem *regs;
+ wait_queue_head_t irq_waitq;
+ uint column;
+ int spareonly;
+ int page_sz;
+ int page;
+ /* Status and ID are in alternate locations. */
+ int alt_buf;
+#define ALT_BUF_ID 1
+#define ALT_BUF_STAT 2
+ struct clk *clk;
+
+ struct vf610_nfc_config cfg;
+};
+
+#define mtd_to_nfc(_mtd) container_of(_mtd, struct vf610_nfc, mtd)
+
+static inline u32 vf610_nfc_read(struct vf610_nfc *nfc, uint reg)
+{
+ return readl(nfc->regs + reg);
+}
+
+static inline void vf610_nfc_write(struct vf610_nfc *nfc, uint reg, u32 val)
+{
+ writel(val, nfc->regs + reg);
+}
+
+static inline void vf610_nfc_set(struct vf610_nfc *nfc, uint reg, u32 bits)
+{
+ vf610_nfc_write(nfc, reg, vf610_nfc_read(nfc, reg) | bits);
+}
+
+static inline void vf610_nfc_clear(struct vf610_nfc *nfc, uint reg, u32 bits)
+{
+ vf610_nfc_write(nfc, reg, vf610_nfc_read(nfc, reg) & ~bits);
+}
+
+static inline void vf610_nfc_set_field(struct vf610_nfc *nfc, u32 reg,
+ u32 mask, u32 shift, u32 val)
+{
+ vf610_nfc_write(nfc, reg,
+ (vf610_nfc_read(nfc, reg) & (~mask)) | val << shift);
+}
+
+static inline void vf610_nfc_memcpy(void *dst, const void *src, size_t n)
+{
+ /*
+ * Use this accessor for the interal SRAM buffers. On ARM we can
+ * treat the SRAM buffer as if its memory, hence use memcpy
+ */
+ memcpy(dst, src, n);
+}
+
+/* Clear flags for upcoming command */
+static inline void vf610_nfc_clear_status(struct vf610_nfc *nfc)
+{
+ void __iomem *reg = nfc->regs + NFC_IRQ_STATUS;
+ u32 tmp = __raw_readl(reg);
+
+ tmp |= CMD_DONE_CLEAR_BIT | IDLE_CLEAR_BIT;
+ __raw_writel(tmp, reg);
+}
+
+static inline void vf610_nfc_done(struct vf610_nfc *nfc)
+{
+ int rv;
+
+ /*
+ * Barrier is needed after this write. This write need
+ * to be done before reading the next register the first
+ * time.
+ * vf610_nfc_set implicates such a barrier by using writel
+ * to write to the register.
+ */
+ vf610_nfc_set(nfc, NFC_IRQ_STATUS, IDLE_EN_BIT);
+ vf610_nfc_set(nfc, NFC_FLASH_CMD2, START_BIT);
+
+ if (!(vf610_nfc_read(nfc, NFC_IRQ_STATUS) & IDLE_IRQ_BIT)) {
+ rv = wait_event_timeout(nfc->irq_waitq,
+ (vf610_nfc_read(nfc, NFC_IRQ_STATUS) & IDLE_IRQ_BIT),
+ NFC_TIMEOUT);
+ if (!rv)
+ dev_warn(nfc->dev, "Timeout while waiting for BUSY.\n");
+ }
+ vf610_nfc_clear_status(nfc);
+}
+
+static u8 vf610_nfc_get_id(struct vf610_nfc *nfc, int col)
+{
+ u32 flash_id;
+
+ if (col < 4) {
+ flash_id = vf610_nfc_read(nfc, NFC_FLASH_STATUS1);
+ return (flash_id >> (3-col)*8) & 0xff;
+ } else {
+ flash_id = vf610_nfc_read(nfc, NFC_FLASH_STATUS2);
+ return flash_id >> 24;
+ }
+}
+
+static u8 vf610_nfc_get_status(struct vf610_nfc *nfc)
+{
+ return vf610_nfc_read(nfc, NFC_FLASH_STATUS2) & STATUS_BYTE1_MASK;
+}
+
+static void vf610_nfc_send_command(struct vf610_nfc *nfc, u32 cmd_byte1,
+ u32 cmd_code)
+{
+ void __iomem *reg = nfc->regs + NFC_FLASH_CMD2;
+ u32 tmp;
+
+ vf610_nfc_clear_status(nfc);
+
+ tmp = __raw_readl(reg);
+ tmp &= ~(CMD_BYTE1_MASK | CMD_CODE_MASK | BUFNO_MASK);
+ tmp |= cmd_byte1 << CMD_BYTE1_SHIFT;
+ tmp |= cmd_code << CMD_CODE_SHIFT;
+ __raw_writel(tmp, reg);
+}
+
+static void vf610_nfc_send_commands(struct vf610_nfc *nfc, u32 cmd_byte1,
+ u32 cmd_byte2, u32 cmd_code)
+{
+ void __iomem *reg = nfc->regs + NFC_FLASH_CMD1;
+ u32 tmp;
+
+ vf610_nfc_send_command(nfc, cmd_byte1, cmd_code);
+
+ tmp = __raw_readl(reg);
+ tmp &= ~CMD_BYTE2_MASK;
+ tmp |= cmd_byte2 << CMD_BYTE2_SHIFT;
+ __raw_writel(tmp, reg);
+}
+
+static irqreturn_t vf610_nfc_irq(int irq, void *data)
+{
+ struct mtd_info *mtd = data;
+ struct vf610_nfc *nfc = mtd_to_nfc(mtd);
+
+ vf610_nfc_clear(nfc, NFC_IRQ_STATUS, IDLE_EN_BIT);
+ wake_up(&nfc->irq_waitq);
+
+ return IRQ_HANDLED;
+}
+
+static void vf610_nfc_addr_cycle(struct vf610_nfc *nfc, int column, int page)
+{
+ if (column != -1) {
+ if (nfc->chip.options | NAND_BUSWIDTH_16)
+ column = column/2;
+ vf610_nfc_set_field(nfc, NFC_COL_ADDR, COL_ADDR_MASK,
+ COL_ADDR_SHIFT, column);
+ }
+ if (page != -1)
+ vf610_nfc_set_field(nfc, NFC_ROW_ADDR, ROW_ADDR_MASK,
+ ROW_ADDR_SHIFT, page);
+}
+
+static inline void vf610_nfc_transfer_size(void __iomem *regbase, int size)
+{
+ __raw_writel(size, regbase + NFC_SECTOR_SIZE);
+}
+
+static void vf610_nfc_command(struct mtd_info *mtd, unsigned command,
+ int column, int page)
+{
+ struct vf610_nfc *nfc = mtd_to_nfc(mtd);
+
+ nfc->column = max(column, 0);
+ nfc->spareonly = 0;
+ nfc->alt_buf = 0;
+
+ switch (command) {
+ case NAND_CMD_PAGEPROG:
+ nfc->page = -1;
+ vf610_nfc_transfer_size(nfc->regs, nfc->page_sz);
+ vf610_nfc_send_commands(nfc, NAND_CMD_SEQIN,
+ command, PROGRAM_PAGE_CMD_CODE);
+ vf610_nfc_addr_cycle(nfc, column, page);
+ break;
+
+ case NAND_CMD_RESET:
+ vf610_nfc_transfer_size(nfc->regs, 0);
+ vf610_nfc_send_command(nfc, command, RESET_CMD_CODE);
+ break;
+ /*
+ * NFC does not support sub-page reads and writes,
+ * so emulate them using full page transfers.
+ */
+ case NAND_CMD_READOOB:
+ nfc->spareonly = 1;
+ case NAND_CMD_SEQIN: /* Pre-read for partial writes. */
+ case NAND_CMD_READ0:
+ column = 0;
+ /* Already read? */
+ if (nfc->page == page)
+ return;
+ nfc->page = page;
+ vf610_nfc_transfer_size(nfc->regs, nfc->page_sz);
+ vf610_nfc_send_commands(nfc, NAND_CMD_READ0,
+ NAND_CMD_READSTART, READ_PAGE_CMD_CODE);
+ vf610_nfc_addr_cycle(nfc, column, page);
+ break;
+
+ case NAND_CMD_ERASE1:
+ nfc->page = -1;
+ vf610_nfc_transfer_size(nfc->regs, 0);
+ vf610_nfc_send_commands(nfc, command,
+ NAND_CMD_ERASE2, ERASE_CMD_CODE);
+ vf610_nfc_addr_cycle(nfc, column, page);
+ break;
+
+ case NAND_CMD_READID:
+ nfc->alt_buf = ALT_BUF_ID;
+ vf610_nfc_transfer_size(nfc->regs, 0);
+ vf610_nfc_send_command(nfc, command, READ_ID_CMD_CODE);
+ break;
+
+ case NAND_CMD_STATUS:
+ nfc->alt_buf = ALT_BUF_STAT;
+ vf610_nfc_transfer_size(nfc->regs, 0);
+ vf610_nfc_send_command(nfc, command, STATUS_READ_CMD_CODE);
+ break;
+ default:
+ return;
+ }
+
+ vf610_nfc_done(nfc);
+}
+
+static inline void vf610_nfc_read_spare(struct mtd_info *mtd, void *buf,
+ int len)
+{
+ struct vf610_nfc *nfc = mtd_to_nfc(mtd);
+
+ len = min_t(uint, mtd->oobsize, len);
+ if (len > 0)
+ vf610_nfc_memcpy(buf, nfc->regs + mtd->writesize, len);
+}
+
+static void vf610_nfc_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+{
+ struct vf610_nfc *nfc = mtd_to_nfc(mtd);
+ uint c = nfc->column;
+ uint l;
+
+ /* Handle main area */
+ if (!nfc->spareonly) {
+ l = min_t(uint, len, mtd->writesize - c);
+ nfc->column += l;
+
+ if (!nfc->alt_buf)
+ vf610_nfc_memcpy(buf, nfc->regs + NFC_MAIN_AREA(0) + c, l);
+ else
+ if (nfc->alt_buf & ALT_BUF_ID)
+ *buf = vf610_nfc_get_id(nfc, c);
+ else
+ *buf = vf610_nfc_get_status(nfc);
+
+ buf += l;
+ len -= l;
+ }
+
+ /* Handle spare area access */
+ if (len) {
+ nfc->column += len;
+ vf610_nfc_read_spare(mtd, buf, len);
+ }
+}
+
+static void vf610_nfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct vf610_nfc *nfc = mtd_to_nfc(mtd);
+ uint c = nfc->column;
+ uint l;
+
+ l = min_t(uint, len, mtd->writesize + mtd->oobsize - c);
+ nfc->column += l;
+ vf610_nfc_memcpy(nfc->regs + NFC_MAIN_AREA(0) + c, buf, l);
+}
+
+static uint8_t vf610_nfc_read_byte(struct mtd_info *mtd)
+{
+ u8 tmp;
+
+ vf610_nfc_read_buf(mtd, &tmp, sizeof(tmp));
+ return tmp;
+}
+
+static u16 vf610_nfc_read_word(struct mtd_info *mtd)
+{
+ u16 tmp;
+
+ vf610_nfc_read_buf(mtd, (u_char *)&tmp, sizeof(tmp));
+ return tmp;
+}
+
+/* If not provided, upper layers apply a fixed delay. */
+static int vf610_nfc_dev_ready(struct mtd_info *mtd)
+{
+ /* NFC handles R/B internally; always ready. */
+ return 1;
+}
+
+/*
+ * This function supports Vybrid only (MPC5125 would have full RB and four CS)
+ */
+static void vf610_nfc_select_chip(struct mtd_info *mtd, int chip)
+{
+#ifdef CONFIG_SOC_VF610
+ struct vf610_nfc *nfc = mtd_to_nfc(mtd);
+ u32 tmp = vf610_nfc_read(nfc, NFC_ROW_ADDR);
+
+ tmp &= ~(ROW_ADDR_CHIP_SEL_RB_MASK | ROW_ADDR_CHIP_SEL_MASK);
+ tmp |= 1 << ROW_ADDR_CHIP_SEL_RB_SHIFT;
+
+ if (chip == 0)
+ tmp |= 1 << ROW_ADDR_CHIP_SEL_SHIFT;
+ else if (chip == 1)
+ tmp |= 2 << ROW_ADDR_CHIP_SEL_SHIFT;
+
+ vf610_nfc_write(nfc, NFC_ROW_ADDR, tmp);
+#endif
+}
+
+#ifdef CONFIG_OF_MTD
+static const struct of_device_id vf610_nfc_dt_ids[] = {
+ { .compatible = "fsl,vf610-nfc" },
+ { .compatible = "fsl,mpc5125-nfc" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, vf610_nfc_dt_ids);
+
+static int vf610_nfc_probe_dt(struct device *dev, struct vf610_nfc_config *cfg)
+{
+ struct device_node *np = dev->of_node;
+ int buswidth;
+
+ if (!np)
+ return 1;
+
+ cfg->flash_bbt = of_get_nand_on_flash_bbt(np);
+
+ buswidth = of_get_nand_bus_width(np);
+ if (buswidth < 0)
+ return buswidth;
+
+ cfg->width = buswidth;
+
+ return 0;
+}
+#else
+static int vf610_nfc_probe_dt(struct device *dev, struct vf610_nfc_config *cfg)
+{
+ return 0;
+}
+#endif
+
+static int vf610_nfc_init_controller(struct vf610_nfc *nfc)
+{
+ struct vf610_nfc_config *cfg = &nfc->cfg;
+
+ if (cfg->width == 16)
+ vf610_nfc_set(nfc, NFC_FLASH_CONFIG, CONFIG_16BIT);
+ else
+ vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_16BIT);
+
+ /* Set configuration register. */
+ vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_ADDR_AUTO_INCR_BIT);
+ vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_BUFNO_AUTO_INCR_BIT);
+ vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_BOOT_MODE_BIT);
+ vf610_nfc_clear(nfc, NFC_FLASH_CONFIG, CONFIG_DMA_REQ_BIT);
+ vf610_nfc_set(nfc, NFC_FLASH_CONFIG, CONFIG_FAST_FLASH_BIT);
+
+ /* PAGE_CNT = 1 */
+ vf610_nfc_set_field(nfc, NFC_FLASH_CONFIG, CONFIG_PAGE_CNT_MASK,
+ CONFIG_PAGE_CNT_SHIFT, 1);
+
+ return 0;
+}
+
+static int vf610_nfc_probe(struct platform_device *pdev)
+{
+ struct vf610_nfc *nfc;
+ struct resource *res;
+ struct mtd_info *mtd;
+ struct nand_chip *chip;
+ struct vf610_nfc_config *cfg;
+ int err = 0;
+ int irq;
+
+ nfc = devm_kzalloc(&pdev->dev, sizeof(*nfc), GFP_KERNEL);
+ if (!nfc)
+ return -ENOMEM;
+
+ cfg = &nfc->cfg;
+
+ nfc->dev = &pdev->dev;
+ nfc->page = -1;
+ mtd = &nfc->mtd;
+ chip = &nfc->chip;
+
+ mtd->priv = chip;
+ mtd->owner = THIS_MODULE;
+ mtd->dev.parent = nfc->dev;
+ mtd->name = DRV_NAME;
+
+ err = vf610_nfc_probe_dt(nfc->dev, cfg);
+ if (err)
+ return -ENODEV;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0)
+ return -EINVAL;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ nfc->regs = devm_ioremap_resource(nfc->dev, res);
+ if (IS_ERR(nfc->regs))
+ return PTR_ERR(nfc->regs);
+
+ nfc->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(nfc->clk))
+ return PTR_ERR(nfc->clk);
+
+ err = clk_prepare_enable(nfc->clk);
+ if (err) {
+ dev_err(nfc->dev, "Unable to enable clock!\n");
+ return err;
+ }
+
+ if (cfg->width == 16)
+ chip->options |= NAND_BUSWIDTH_16;
+ else
+ chip->options &= ~NAND_BUSWIDTH_16;
+
+ chip->dev_ready = vf610_nfc_dev_ready;
+ chip->cmdfunc = vf610_nfc_command;
+ chip->read_byte = vf610_nfc_read_byte;
+ chip->read_word = vf610_nfc_read_word;
+ chip->read_buf = vf610_nfc_read_buf;
+ chip->write_buf = vf610_nfc_write_buf;
+ chip->select_chip = vf610_nfc_select_chip;
+
+ /* Bad block options. */
+ if (cfg->flash_bbt)
+ chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB |
+ NAND_BBT_CREATE;
+
+ init_waitqueue_head(&nfc->irq_waitq);
+
+ err = devm_request_irq(nfc->dev, irq, vf610_nfc_irq, 0, DRV_NAME, mtd);
+ if (err) {
+ dev_err(nfc->dev, "Error requesting IRQ!\n");
+ goto error;
+ }
+
+ nfc->page_sz = PAGE_2K + OOB_64;
+ nfc->page_sz += cfg->width == 16 ? 1 : 0;
+
+ vf610_nfc_init_controller(nfc);
+
+ /* first scan to find the device and get the page size */
+ if (nand_scan_ident(mtd, 1, NULL)) {
+ err = -ENXIO;
+ goto error;
+ }
+
+ chip->ecc.mode = NAND_ECC_SOFT; /* default */
+
+ nfc->page_sz = mtd->writesize + mtd->oobsize;
+
+ /* Single buffer only, max 256 OOB minus ECC status */
+ if (nfc->page_sz > PAGE_2K + 256 - 8) {
+ dev_err(nfc->dev, "Unsupported flash page size\n");
+ err = -ENXIO;
+ goto error;
+ }
+ nfc->page_sz += cfg->width == 16 ? 1 : 0;
+
+ /* second phase scan */
+ if (nand_scan_tail(mtd)) {
+ err = -ENXIO;
+ goto error;
+ }
+
+ /* Register device in MTD */
+ mtd_device_parse_register(mtd, NULL,
+ &(struct mtd_part_parser_data){
+ .of_node = pdev->dev.of_node,
+ },
+ NULL, 0);
+
+ platform_set_drvdata(pdev, mtd);
+
+ return 0;
+
+error:
+ clk_disable_unprepare(nfc->clk);
+ return err;
+}
+
+static int vf610_nfc_remove(struct platform_device *pdev)
+{
+ struct mtd_info *mtd = platform_get_drvdata(pdev);
+ struct vf610_nfc *nfc = mtd_to_nfc(mtd);
+
+ nand_release(mtd);
+ clk_disable_unprepare(nfc->clk);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int vf610_nfc_suspend(struct device *dev)
+{
+ struct mtd_info *mtd = dev_get_drvdata(dev);
+ struct vf610_nfc *nfc = mtd_to_nfc(mtd);
+
+ clk_disable_unprepare(nfc->clk);
+ return 0;
+}
+
+static int vf610_nfc_resume(struct device *dev)
+{
+ struct mtd_info *mtd = dev_get_drvdata(dev);
+ struct vf610_nfc *nfc = mtd_to_nfc(mtd);
+
+ pinctrl_pm_select_default_state(dev);
+
+ clk_prepare_enable(nfc->clk);
+
+ vf610_nfc_init_controller(nfc);
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(vf610_nfc_pm_ops, vf610_nfc_suspend, vf610_nfc_resume);
+
+static struct platform_driver vf610_nfc_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = vf610_nfc_dt_ids,
+ .pm = &vf610_nfc_pm_ops,
+ },
+ .probe = vf610_nfc_probe,
+ .remove = vf610_nfc_remove,
+};
+
+module_platform_driver(vf610_nfc_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Freescale VF610/MPC5125 NFC MTD NAND driver");
+MODULE_LICENSE("GPL");
--
2.3.3
--
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