ar71xx: rewrite SPI drivers for the RB4xx boards

  * add a new SPI controller driver
  * add SPI driver for the CPLD chip
  * convert the NAND driver
  * enable the mikroSD slot
  * enable more LEDs

SVN-Revision: 22863

1 files changed, 106 insertions, 308 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
index a107708..59ea17d 100644
--- a/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c
+++ b/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c
@@ -1,7 +1,7 @@
 /*
  *  NAND flash driver for the MikroTik RouterBoard 4xx series
  *
- *  Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008-2010 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
@@ -23,49 +23,16 @@
 #include <linux/slab.h>
 
 #include <asm/mach-ar71xx/ar71xx.h>
+#include <asm/mach-ar71xx/rb4xx_cpld.h>
 
 #define DRV_NAME        "rb4xx-nand"
-#define DRV_VERSION     "0.1.10"
+#define DRV_VERSION     "0.2.0"
 #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)
+#define RB4XX_NAND_GPIO_READY	5
+#define RB4XX_NAND_GPIO_ALE	37
+#define RB4XX_NAND_GPIO_CLE	38
+#define RB4XX_NAND_GPIO_NCE	39
 
 struct rb4xx_nand_info {
 	struct nand_chip	chip;
@@ -102,318 +69,138 @@ static struct mtd_partition rb4xx_nand_partitions[] = {
 	},
 };
 
-#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)
+static int rb4xx_nand_dev_ready(struct mtd_info *mtd)
 {
-	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));
+	return gpio_get_value(RB4XX_NAND_GPIO_READY);
 }
 
-#if USE_FAST_WRITE
-static inline void do_spi_clk_fast(int bit1, int bit2)
+static void rb4xx_nand_write_cmd(unsigned char cmd)
 {
-	unsigned bval = (SBIT_IOC_BASE |
-			((bit1 << SBIT_IOC_DO_SHIFT) & SBIT_IOC_DO) |
-			((bit2 << SBIT_IOC_DO2_SHIFT) & SBIT_IOC_DO2));
+	unsigned char data = cmd;
+	int err;
 
-	rb4xx_spi_wreg(SPI_REG_IOC, bval);
-	rb4xx_spi_wreg(SPI_REG_IOC, bval | SPI_IOC_CLK);
+	err = rb4xx_cpld_write(&data, 1);
+	if (err)
+		pr_err("rb4xx_nand: write cmd failed, err=%d\n", err);
 }
 
-static inline void do_spi_byte_fast(uint8_t byte)
+static void rb4xx_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
+				unsigned int ctrl)
 {
-	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);
+	if (ctrl & NAND_CTRL_CHANGE) {
+		gpio_set_value(RB4XX_NAND_GPIO_CLE, (ctrl & NAND_CLE) ? 1 : 0);
+		gpio_set_value(RB4XX_NAND_GPIO_ALE, (ctrl & NAND_ALE) ? 1 : 0);
+		gpio_set_value(RB4XX_NAND_GPIO_NCE, (ctrl & NAND_NCE) ? 0 : 1);
+	}
 
-	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);
+	if (cmd != NAND_CMD_NONE)
+		rb4xx_nand_write_cmd(cmd);
 }
-#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)
+static unsigned char rb4xx_nand_read_byte(struct mtd_info *mtd)
 {
-	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);
+	unsigned char data = 0;
+	int err;
 
-	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;
-		}
+	err = rb4xx_cpld_read(&data, NULL, 1);
+	if (err) {
+		pr_err("rb4xx_nand: read data failed, err=%d\n", err);
+		data = 0xff;
 	}
 
-	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;
+	return data;
 }
 
-static int got_write = 1;
-
-static void rb4xx_nand_write_data(const uint8_t *byte, unsigned cnt)
+static void rb4xx_nand_write_buf(struct mtd_info *mtd, const unsigned char *buf,
+				 int len)
 {
-	do_spi_cmd(CPLD_CMD_WRITE_MULT, cnt, byte, 1, NULL, NULL, 1);
-	got_write = 1;
-}
+	int err;
 
-static void rb4xx_nand_write_byte(uint8_t byte)
-{
-	rb4xx_nand_write_data(&byte, 1);
+	err = rb4xx_cpld_write(buf, len);
+	if (err)
+		pr_err("rb4xx_nand: write buf failed, err=%d\n", err);
 }
 
-#if USE_FAST_READ
-static uint8_t *rb4xx_nand_read_getaddr(unsigned cnt)
+static void rb4xx_nand_read_buf(struct mtd_info *mtd, unsigned char *buf,
+				int len)
 {
-	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);
-	}
+	int err;
 
-	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;
+	err = rb4xx_cpld_read(buf, NULL, len);
+	if (err)
+		pr_err("rb4xx_nand: read buf failed, err=%d\n", err);
 }
 
-static void rb4xx_nand_read_data(uint8_t *buf, unsigned cnt)
+static int __init rb4xx_nand_probe(struct platform_device *pdev)
 {
-	unsigned size32 = cnt & ~31;
-	unsigned remain = cnt & 31;
+	struct rb4xx_nand_info	*info;
+	int ret;
 
-	if (size32) {
-		uint8_t *addr = rb4xx_nand_read_getaddr(size32);
-		memcpy(buf, (void *)addr, size32);
-	}
+	printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
 
-	if (remain) {
-		do_spi_cmd(CPLD_CMD_READ_MULT, 1, buf, remain,
-			   buf + size32, NULL, 0);
+	ret = gpio_request(RB4XX_NAND_GPIO_READY, "NAND RDY");
+	if (ret) {
+		dev_err(&pdev->dev, "unable to request gpio %d\n",
+			RB4XX_NAND_GPIO_READY);
+		goto err;
 	}
-}
-
-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;
+	ret = gpio_direction_input(RB4XX_NAND_GPIO_READY);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to set input mode on gpio %d\n",
+			RB4XX_NAND_GPIO_READY);
+		goto err_free_gpio_ready;
 	}
 
-	if (remain) {
-		return do_spi_cmd(CPLD_CMD_READ_MULT, 1, buf, remain,
-				  NULL, buf + size32, 0);
+	ret = gpio_request(RB4XX_NAND_GPIO_ALE, "NAND ALE");
+	if (ret) {
+		dev_err(&pdev->dev, "unable to request gpio %d\n",
+			RB4XX_NAND_GPIO_ALE);
+		goto err_free_gpio_ready;
 	}
-	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);
+	ret = gpio_direction_output(RB4XX_NAND_GPIO_ALE, 0);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to set output mode on gpio %d\n",
+			RB4XX_NAND_GPIO_ALE);
+		goto err_free_gpio_ale;
 	}
 
-	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);
+	ret = gpio_request(RB4XX_NAND_GPIO_CLE, "NAND CLE");
+	if (ret) {
+		dev_err(&pdev->dev, "unable to request gpio %d\n",
+			RB4XX_NAND_GPIO_CLE);
+		goto err_free_gpio_ale;
 	}
 
-	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_direction_output(RB4XX_NAND_GPIO_CLE, 0);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to set output mode on gpio %d\n",
+			RB4XX_NAND_GPIO_CLE);
+		goto err_free_gpio_cle;
+	}
 
-	ret = gpio_request(RB4XX_NAND_GPIO_RDY, "NAND RDY");
+	ret = gpio_request(RB4XX_NAND_GPIO_NCE, "NAND NCE");
 	if (ret) {
-		printk(KERN_ERR "rb4xx-nand: gpio request failed\n");
-		return ret;
+		dev_err(&pdev->dev, "unable to request gpio %d\n",
+			RB4XX_NAND_GPIO_NCE);
+		goto err_free_gpio_cle;
 	}
 
-	ret = gpio_direction_input(RB4XX_NAND_GPIO_RDY);
+	ret = gpio_direction_output(RB4XX_NAND_GPIO_NCE, 1);
 	if (ret) {
-		printk(KERN_ERR "rb4xx-nand: unable to set input mode "
-					"on gpio%d\n", RB4XX_NAND_GPIO_RDY);
-		goto err_free_gpio;
+		dev_err(&pdev->dev, "unable to set output mode on gpio %d\n",
+			RB4XX_NAND_GPIO_ALE);
+		goto err_free_gpio_nce;
 	}
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
 	if (!info) {
-		printk(KERN_ERR "rb4xx-nand: no memory for private data\n");
+		dev_err(&pdev->dev, "rb4xx-nand: no memory for private data\n");
 		ret = -ENOMEM;
-		goto err_free_gpio;
+		goto err_free_gpio_nce;
 	}
 
-#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;
@@ -423,7 +210,7 @@ static int __init rb4xx_nand_probe(struct platform_device *pdev)
 	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.verify_buf	= rb4xx_nand_verify_buf;
 
 	info->chip.chip_delay	= 25;
 	info->chip.ecc.mode	= NAND_ECC_SOFT;
@@ -457,14 +244,21 @@ static int __init rb4xx_nand_probe(struct platform_device *pdev)
 
 	return 0;
 
-err_release_nand:
+ err_release_nand:
 	nand_release(&info->mtd);
-err_set_drvdata:
+ err_set_drvdata:
 	platform_set_drvdata(pdev, NULL);
-err_free_info:
+ err_free_info:
 	kfree(info);
-err_free_gpio:
-	gpio_free(RB4XX_NAND_GPIO_RDY);
+ err_free_gpio_nce:
+	gpio_free(RB4XX_NAND_GPIO_NCE);
+ err_free_gpio_cle:
+	gpio_free(RB4XX_NAND_GPIO_CLE);
+ err_free_gpio_ale:
+	gpio_free(RB4XX_NAND_GPIO_ALE);
+ err_free_gpio_ready:
+	gpio_free(RB4XX_NAND_GPIO_READY);
+ err:
 	return ret;
 }
 
@@ -475,6 +269,10 @@ static int __devexit rb4xx_nand_remove(struct platform_device *pdev)
 	nand_release(&info->mtd);
 	platform_set_drvdata(pdev, NULL);
 	kfree(info);
+	gpio_free(RB4XX_NAND_GPIO_NCE);
+	gpio_free(RB4XX_NAND_GPIO_CLE);
+	gpio_free(RB4XX_NAND_GPIO_ALE);
+	gpio_free(RB4XX_NAND_GPIO_READY);
 
 	return 0;
 }