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authorjuhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>2008-07-21 17:08:14 +0000
committerjuhosg <juhosg@3c298f89-4303-0410-b956-a3cf2f4a3e73>2008-07-21 17:08:14 +0000
commit546b5ed544503182a9b3e981bc11feebd6042b21 (patch)
tree10ae3895974888be85ce09abee24fe67b5fbd813 /target/linux/ar71xx/files/drivers/mtd
parent541dcce6ec450a2aceaf1b42b67b16ebfc9730aa (diff)
surprise :p
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11894 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'target/linux/ar71xx/files/drivers/mtd')
-rw-r--r--target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c507
1 files changed, 507 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c b/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c
new file mode 100644
index 000000000..c25283130
--- /dev/null
+++ b/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c
@@ -0,0 +1,507 @@
+/*
+ * NAND flash driver for the MikroTik RouterBoard 4xx series
+ *
+ * Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
+ *
+ * This file was based on the driver for Linux 2.6.22 published by
+ * MikroTik for their RouterBoard 4xx series devices.
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+
+#include <asm/mach-ar71xx/ar71xx.h>
+
+#define DRV_NAME "rb4xx-nand"
+#define DRV_VERSION "0.1.9"
+#define DRV_DESC "NAND flash driver for RouterBoard 4xx series"
+
+#define USE_FAST_READ 1
+#define USE_FAST_WRITE 1
+#undef RB4XX_NAND_DEBUG
+
+#ifdef RB4XX_NAND_DEBUG
+#define DBG(fmt, arg...) printk(KERN_DEBUG DRV_NAME ": " fmt, ## arg)
+#else
+#define DBG(fmt, arg...) do {} while (0)
+#endif
+
+#define RB4XX_NAND_GPIO_RDY 5
+#define RB4XX_FLASH_HZ 33333334
+#define RB4XX_NAND_HZ 33333334
+
+#define SPI_CTRL_FASTEST 0x40
+#define SPI_CTRL_SAFE 0x43 /* 25 MHz for AHB 200 MHz */
+#define SBIT_IOC_BASE SPI_IOC_CS1
+#define SBIT_IOC_DO_SHIFT 0
+#define SBIT_IOC_DO (1u << SBIT_IOC_DO_SHIFT)
+#define SBIT_IOC_DO2_SHIFT 18
+#define SBIT_IOC_DO2 (1u << SBIT_IOC_DO2_SHIFT)
+
+#define CPLD_CMD_WRITE_MULT 0x08 /* send cmd, n x send data, read data */
+#define CPLD_CMD_WRITE_CFG 0x09 /* send cmd, n x send cfg */
+#define CPLD_CMD_READ_MULT 0x0a /* send cmd, send idle, n x read data */
+#define CPLD_CMD_READ_FAST 0x0b /* send cmd, 4 x idle, n x read data */
+
+#define CFG_BIT_nCE 0x80
+#define CFG_BIT_CLE 0x40
+#define CFG_BIT_ALE 0x20
+#define CFG_BIT_FAN 0x10
+#define CFG_BIT_nLED4 0x08
+#define CFG_BIT_nLED3 0x04
+#define CFG_BIT_nLED2 0x02
+#define CFG_BIT_nLED1 0x01
+
+#define CFG_BIT_nLEDS \
+ (CFG_BIT_nLED1 | CFG_BIT_nLED2 | CFG_BIT_nLED3 | CFG_BIT_nLED4)
+
+struct rb4xx_nand_info {
+ struct nand_chip chip;
+ struct mtd_info mtd;
+};
+
+/*
+ * We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader
+ * will not be able to find the kernel that we load.
+ */
+static struct nand_ecclayout rb4xx_nand_ecclayout = {
+ .eccbytes = 6,
+ .eccpos = { 8, 9, 10, 13, 14, 15 },
+ .oobavail = 9,
+ .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
+};
+
+static struct mtd_partition rb4xx_nand_partitions[] = {
+ {
+ .name = "kernel",
+ .offset = (256 * 1024),
+ .size = (4 * 1024 * 1024) - (256 * 1024),
+ },
+ {
+ .name = "rootfs",
+ .offset = MTDPART_OFS_NXTBLK,
+ .size = MTDPART_SIZ_FULL,
+ },
+ {
+ .name = "booter",
+ .offset = 0,
+ .size = (256 * 1024),
+ .mask_flags = MTD_WRITEABLE,
+ }
+};
+
+#if USE_FAST_READ
+#define SPI_NDATA_BASE 0x00800000
+static unsigned spi_ctrl_fread = SPI_CTRL_SAFE;
+static unsigned spi_ctrl_flash = SPI_CTRL_SAFE;
+extern unsigned mips_hpt_frequency;
+#endif
+
+static inline unsigned rb4xx_spi_rreg(unsigned r)
+{
+ return __raw_readl((void * __iomem)(KSEG1ADDR(AR71XX_SPI_BASE) + r));
+}
+
+static inline void rb4xx_spi_wreg(unsigned r, unsigned v)
+{
+ __raw_writel(v, (void * __iomem)(KSEG1ADDR(AR71XX_SPI_BASE) + r));
+}
+
+static inline void do_spi_clk(int bit)
+{
+ unsigned bval = SBIT_IOC_BASE | (bit & 1);
+
+ rb4xx_spi_wreg(SPI_REG_IOC, bval);
+ rb4xx_spi_wreg(SPI_REG_IOC, bval | SPI_IOC_CLK);
+}
+
+static void do_spi_byte(uint8_t byte)
+{
+ do_spi_clk(byte >> 7);
+ do_spi_clk(byte >> 6);
+ do_spi_clk(byte >> 5);
+ do_spi_clk(byte >> 4);
+ do_spi_clk(byte >> 3);
+ do_spi_clk(byte >> 2);
+ do_spi_clk(byte >> 1);
+ do_spi_clk(byte);
+
+ DBG("spi_byte sent 0x%02x got 0x%x\n",
+ byte, rb4xx_spi_rreg(SPI_REG_RDS));
+}
+
+#if USE_FAST_WRITE
+static inline void do_spi_clk_fast(int bit1, int bit2)
+{
+ unsigned bval = (SBIT_IOC_BASE |
+ ((bit1 << SBIT_IOC_DO_SHIFT) & SBIT_IOC_DO) |
+ ((bit2 << SBIT_IOC_DO2_SHIFT) & SBIT_IOC_DO2));
+
+ rb4xx_spi_wreg(SPI_REG_IOC, bval);
+ rb4xx_spi_wreg(SPI_REG_IOC, bval | SPI_IOC_CLK);
+}
+
+static inline void do_spi_byte_fast(uint8_t byte)
+{
+ do_spi_clk_fast(byte >> 7, byte >> 6);
+ do_spi_clk_fast(byte >> 5, byte >> 4);
+ do_spi_clk_fast(byte >> 3, byte >> 2);
+ do_spi_clk_fast(byte >> 1, byte >> 0);
+
+ DBG("spi_byte_fast sent 0x%02x got 0x%x\n",
+ byte, rb4xx_spi_rreg(SPI_REG_RDS));
+}
+#else
+static inline void do_spi_byte_fast(uint8_t byte)
+{
+ do_spi_byte(byte);
+}
+#endif /* USE_FAST_WRITE */
+
+static int do_spi_cmd(unsigned cmd, unsigned sendCnt, const uint8_t *sendData,
+ unsigned recvCnt, uint8_t *recvData,
+ const uint8_t *verifyData, int fastWrite)
+{
+ unsigned i;
+
+ DBG("SPI cmd 0x%x send %u recv %u\n", cmd, sendCnt, recvCnt);
+
+ rb4xx_spi_wreg(SPI_REG_FS, SPI_FS_GPIO);
+ rb4xx_spi_wreg(SPI_REG_CTRL, SPI_CTRL_FASTEST);
+
+ do_spi_byte(cmd);
+#if 0
+ if (cmd == CPLD_CMD_READ_FAST) {
+ do_spi_byte(0x80);
+ do_spi_byte(0);
+ do_spi_byte(0);
+ }
+#endif
+ for (i = 0; i < sendCnt; ++i) {
+ if (fastWrite)
+ do_spi_byte_fast(sendData[i]);
+ else
+ do_spi_byte(sendData[i]);
+ }
+
+ for (i = 0; i < recvCnt; ++i) {
+ if (fastWrite)
+ do_spi_byte_fast(0);
+ else
+ do_spi_byte(0);
+
+ if (recvData) {
+ recvData[i] = rb4xx_spi_rreg(SPI_REG_RDS) & 0xff;
+ } else if (verifyData) {
+ if (verifyData[i] != (rb4xx_spi_rreg(SPI_REG_RDS)
+ & 0xff))
+ break;
+ }
+ }
+
+ rb4xx_spi_wreg(SPI_REG_IOC, SBIT_IOC_BASE | SPI_IOC_CS0);
+ rb4xx_spi_wreg(SPI_REG_CTRL, spi_ctrl_flash);
+ rb4xx_spi_wreg(SPI_REG_FS, 0);
+
+ return i == recvCnt;
+}
+
+static int got_write = 1;
+
+static void rb4xx_nand_write_data(const uint8_t *byte, unsigned cnt)
+{
+ do_spi_cmd(CPLD_CMD_WRITE_MULT, cnt, byte, 1, NULL, NULL, 1);
+ got_write = 1;
+}
+
+static void rb4xx_nand_write_byte(uint8_t byte)
+{
+ rb4xx_nand_write_data(&byte, 1);
+}
+
+#if USE_FAST_READ
+static uint8_t *rb4xx_nand_read_getaddr(unsigned cnt)
+{
+ static unsigned nboffset = 0x100000;
+ unsigned addr;
+
+ if (got_write) {
+ nboffset = (nboffset + 31) & ~31;
+ if (nboffset >= 0x100000) /* 1MB */
+ nboffset = 0;
+
+ got_write = 0;
+ rb4xx_spi_wreg(SPI_REG_FS, SPI_FS_GPIO);
+ rb4xx_spi_wreg(SPI_REG_CTRL, spi_ctrl_fread);
+ rb4xx_spi_wreg(SPI_REG_FS, 0);
+ }
+
+ addr = KSEG1ADDR(AR71XX_SPI_BASE + SPI_NDATA_BASE) + nboffset;
+ DBG("rb4xx_nand_read_getaddr 0x%x cnt 0x%x\n", addr, cnt);
+
+ nboffset += cnt;
+ return (uint8_t *)addr;
+}
+
+static void rb4xx_nand_read_data(uint8_t *buf, unsigned cnt)
+{
+ unsigned size32 = cnt & ~31;
+ unsigned remain = cnt & 31;
+
+ if (size32) {
+ uint8_t *addr = rb4xx_nand_read_getaddr(size32);
+ memcpy(buf, (void *)addr, size32);
+ }
+
+ if (remain) {
+ do_spi_cmd(CPLD_CMD_READ_MULT, 1, buf, remain,
+ buf + size32, NULL, 0);
+ }
+}
+
+static int rb4xx_nand_verify_data(const uint8_t *buf, unsigned cnt)
+{
+ unsigned size32 = cnt & ~31;
+ unsigned remain = cnt & 31;
+
+ if (size32) {
+ uint8_t *addr = rb4xx_nand_read_getaddr(size32);
+ if (memcmp(buf, (void *)addr, size32) != 0)
+ return 0;
+ }
+
+ if (remain) {
+ return do_spi_cmd(CPLD_CMD_READ_MULT, 1, buf, remain,
+ NULL, buf + size32, 0);
+ }
+ return 1;
+}
+#else /* USE_FAST_READ */
+static void rb4xx_nand_read_data(uint8_t *buf, unsigned cnt)
+{
+ do_spi_cmd(CPLD_CMD_READ_MULT, 1, buf, cnt, buf, NULL, 0);
+}
+
+static int rb4xx_nand_verify_data(const uint8_t *buf, unsigned cnt)
+{
+ return do_spi_cmd(CPLD_CMD_READ_MULT, 1, buf, cnt, NULL, buf, 0);
+}
+#endif /* USE_FAST_READ */
+
+static void rb4xx_nand_write_cfg(uint8_t byte)
+{
+ do_spi_cmd(CPLD_CMD_WRITE_CFG, 1, &byte, 0, NULL, NULL, 0);
+ got_write = 1;
+}
+
+static int rb4xx_nand_dev_ready(struct mtd_info *mtd)
+{
+ return gpio_get_value(RB4XX_NAND_GPIO_RDY);
+}
+
+static void rb4xx_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
+ unsigned int ctrl)
+{
+ if (ctrl & NAND_CTRL_CHANGE) {
+ uint8_t cfg = CFG_BIT_nLEDS;
+
+ cfg |= (ctrl & NAND_CLE) ? CFG_BIT_CLE : 0;
+ cfg |= (ctrl & NAND_ALE) ? CFG_BIT_ALE : 0;
+ cfg |= (ctrl & NAND_NCE) ? 0 : CFG_BIT_nCE;
+
+ rb4xx_nand_write_cfg(cfg);
+ }
+
+ if (cmd != NAND_CMD_NONE)
+ rb4xx_nand_write_byte(cmd);
+}
+
+static uint8_t rb4xx_nand_read_byte(struct mtd_info *mtd)
+{
+ uint8_t byte = 0;
+
+ rb4xx_nand_read_data(&byte, 1);
+ return byte;
+}
+
+static void rb4xx_nand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
+ int len)
+{
+ rb4xx_nand_write_data(buf, len);
+}
+
+static void rb4xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf,
+ int len)
+{
+ rb4xx_nand_read_data(buf, len);
+}
+
+static int rb4xx_nand_verify_buf(struct mtd_info *mtd, const uint8_t *buf,
+ int len)
+{
+ if (!rb4xx_nand_verify_data(buf, len))
+ return -EFAULT;
+
+ return 0;
+}
+
+static unsigned get_spi_ctrl(unsigned hz_max, const char *name)
+{
+ unsigned div;
+
+ div = (ar71xx_ahb_freq - 1) / (2 * hz_max);
+ /*
+ * CPU has a bug at (div == 0) - first bit read is random
+ */
+ if (div == 0)
+ ++div;
+
+ if (name) {
+ unsigned ahb_khz = (ar71xx_ahb_freq + 500) / 1000;
+ unsigned div_real = 2 * (div + 1);
+ printk(KERN_INFO "%s SPI clock %u kHz (AHB %u kHz / %u)\n",
+ name,
+ ahb_khz / div_real,
+ ahb_khz, div_real);
+ }
+
+ return SPI_CTRL_FASTEST + div;
+}
+
+static int __init rb4xx_nand_probe(struct platform_device *pdev)
+{
+ struct rb4xx_nand_info *info;
+ int ret;
+
+ printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
+
+ ret = gpio_request(RB4XX_NAND_GPIO_RDY, "NAND RDY");
+ if (ret) {
+ printk(KERN_ERR "rb4xx-nand: gpio request failed\n");
+ return ret;
+ }
+
+ ret = gpio_direction_input(RB4XX_NAND_GPIO_RDY);
+ if (ret) {
+ printk(KERN_ERR "rb4xx-nand: unable to set input mode "
+ "on gpio%d\n", RB4XX_NAND_GPIO_RDY);
+ goto err_free_gpio;
+ }
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info) {
+ printk(KERN_ERR "rb4xx-nand: no memory for private data\n");
+ ret = -ENOMEM;
+ goto err_free_gpio;
+ }
+
+#if USE_FAST_READ
+ spi_ctrl_fread = get_spi_ctrl(RB4XX_NAND_HZ, "NAND");
+#endif
+ spi_ctrl_flash = get_spi_ctrl(RB4XX_FLASH_HZ, "FLASH");
+
+ rb4xx_nand_write_cfg(CFG_BIT_nLEDS | CFG_BIT_nCE);
+
+ info->chip.priv = &info;
+ info->mtd.priv = &info->chip;
+ info->mtd.owner = THIS_MODULE;
+
+ info->chip.cmd_ctrl = rb4xx_nand_cmd_ctrl;
+ info->chip.dev_ready = rb4xx_nand_dev_ready;
+ info->chip.read_byte = rb4xx_nand_read_byte;
+ info->chip.write_buf = rb4xx_nand_write_buf;
+ info->chip.read_buf = rb4xx_nand_read_buf;
+ info->chip.verify_buf = rb4xx_nand_verify_buf;
+
+ info->chip.chip_delay = 25;
+ info->chip.ecc.mode = NAND_ECC_SOFT;
+ info->chip.options |= NAND_NO_AUTOINCR;
+
+ platform_set_drvdata(pdev, info);
+
+ ret = nand_scan_ident(&info->mtd, 1);
+ if (ret) {
+ ret = -ENXIO;
+ goto err_free_info;
+ }
+
+ if (info->mtd.writesize == 512)
+ info->chip.ecc.layout = &rb4xx_nand_ecclayout;
+
+ ret = nand_scan_tail(&info->mtd);
+ if (ret) {
+ return -ENXIO;
+ goto err_set_drvdata;
+ }
+
+#ifdef CONFIG_MTD_PARTITIONS
+ ret = add_mtd_partitions(&info->mtd, rb4xx_nand_partitions,
+ ARRAY_SIZE(rb4xx_nand_partitions));
+#else
+ ret = add_mtd_device(&info->mtd);
+#endif
+ if (ret)
+ goto err_release_nand;
+
+ return 0;
+
+err_release_nand:
+ nand_release(&info->mtd);
+err_set_drvdata:
+ platform_set_drvdata(pdev, NULL);
+err_free_info:
+ kfree(info);
+err_free_gpio:
+ gpio_free(RB4XX_NAND_GPIO_RDY);
+ return ret;
+}
+
+static int __devexit rb4xx_nand_remove(struct platform_device *pdev)
+{
+ struct rb4xx_nand_info *info = platform_get_drvdata(pdev);
+
+ nand_release(&info->mtd);
+ platform_set_drvdata(pdev, NULL);
+ kfree(info);
+
+ return 0;
+}
+
+static struct platform_driver rb4xx_nand_driver = {
+ .probe = rb4xx_nand_probe,
+ .remove = __devexit_p(rb4xx_nand_remove),
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init rb4xx_nand_init(void)
+{
+ return platform_driver_register(&rb4xx_nand_driver);
+}
+
+static void __exit rb4xx_nand_exit(void)
+{
+ platform_driver_unregister(&rb4xx_nand_driver);
+}
+
+module_init(rb4xx_nand_init);
+module_exit(rb4xx_nand_exit);
+
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
+MODULE_LICENSE("GPL v2");