surprise :p

SVN-Revision: 11894

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 0000000..c252831
--- /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");