diff options
Diffstat (limited to 'target/linux/xburst/files-2.6.32/drivers/mtd/nand')
-rw-r--r-- | target/linux/xburst/files-2.6.32/drivers/mtd/nand/jz4740_nand.c | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/target/linux/xburst/files-2.6.32/drivers/mtd/nand/jz4740_nand.c b/target/linux/xburst/files-2.6.32/drivers/mtd/nand/jz4740_nand.c new file mode 100644 index 0000000..d1e3818 --- /dev/null +++ b/target/linux/xburst/files-2.6.32/drivers/mtd/nand/jz4740_nand.c @@ -0,0 +1,418 @@ +/* + * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de> + * JZ4720/JZ4740 SoC NAND controller driver + * + * This program 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. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include <linux/ioport.h> +#include <linux/platform_device.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> + +#include <linux/mtd/jz4740_nand.h> +#include <linux/gpio.h> + +#define JZ_REG_NAND_CTRL 0x50 +#define JZ_REG_NAND_ECC_CTRL 0x100 +#define JZ_REG_NAND_DATA 0x104 +#define JZ_REG_NAND_PAR0 0x108 +#define JZ_REG_NAND_PAR1 0x10C +#define JZ_REG_NAND_PAR2 0x110 +#define JZ_REG_NAND_IRQ_STAT 0x114 +#define JZ_REG_NAND_IRQ_CTRL 0x118 +#define JZ_REG_NAND_ERR(x) (0x11C + (x << 2)) + +#define JZ_NAND_ECC_CTRL_PAR_READY BIT(4) +#define JZ_NAND_ECC_CTRL_ENCODING BIT(3) +#define JZ_NAND_ECC_CTRL_RS BIT(2) +#define JZ_NAND_ECC_CTRL_RESET BIT(1) +#define JZ_NAND_ECC_CTRL_ENABLE BIT(0) + +#define JZ_NAND_STATUS_ERR_COUNT (BIT(31) | BIT(30) | BIT(29)) +#define JZ_NAND_STATUS_PAD_FINISH BIT(4) +#define JZ_NAND_STATUS_DEC_FINISH BIT(3) +#define JZ_NAND_STATUS_ENC_FINISH BIT(2) +#define JZ_NAND_STATUS_UNCOR_ERROR BIT(1) +#define JZ_NAND_STATUS_ERROR BIT(0) + +#define JZ_NAND_CTRL_ENABLE_CHIP(x) BIT(x << 1) +#define JZ_NAND_CTRL_ASSERT_CHIP(x) BIT((x << 1) + 1) + +#define JZ_NAND_DATA_ADDR ((void __iomem *)0xB8000000) +#define JZ_NAND_CMD_ADDR (JZ_NAND_DATA_ADDR + 0x8000) +#define JZ_NAND_ADDR_ADDR (JZ_NAND_DATA_ADDR + 0x10000) + +struct jz_nand { + struct mtd_info mtd; + struct nand_chip chip; + void __iomem *base; + struct resource *mem; + + struct jz_nand_platform_data *pdata; +}; + +static inline struct jz_nand *mtd_to_jz_nand(struct mtd_info *mtd) +{ + return container_of(mtd, struct jz_nand, mtd); +} + +static void jz_nand_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl) +{ + struct jz_nand *nand = mtd_to_jz_nand(mtd); + struct nand_chip *chip = mtd->priv; + uint32_t reg; + + if (ctrl & NAND_CTRL_CHANGE) { + BUG_ON((ctrl & NAND_ALE) && (ctrl & NAND_CLE)); + if (ctrl & NAND_ALE) + chip->IO_ADDR_W = JZ_NAND_ADDR_ADDR; + else if (ctrl & NAND_CLE) + chip->IO_ADDR_W = JZ_NAND_CMD_ADDR; + else + chip->IO_ADDR_W = JZ_NAND_DATA_ADDR; + + reg = readl(nand->base + JZ_REG_NAND_CTRL); + if ( ctrl & NAND_NCE ) + reg |= JZ_NAND_CTRL_ASSERT_CHIP(0); + else + reg &= ~JZ_NAND_CTRL_ASSERT_CHIP(0); + writel(reg, nand->base + JZ_REG_NAND_CTRL); + } + if (dat != NAND_CMD_NONE) + writeb(dat, chip->IO_ADDR_W); +} + +static int jz_nand_dev_ready(struct mtd_info *mtd) +{ + struct jz_nand *nand = mtd_to_jz_nand(mtd); + return gpio_get_value_cansleep(nand->pdata->busy_gpio); +} + +static void jz_nand_hwctl(struct mtd_info *mtd, int mode) +{ + struct jz_nand *nand = mtd_to_jz_nand(mtd); + uint32_t reg; + + + writel(0, nand->base + JZ_REG_NAND_IRQ_STAT); + reg = readl(nand->base + JZ_REG_NAND_ECC_CTRL); + + reg |= JZ_NAND_ECC_CTRL_RESET; + reg |= JZ_NAND_ECC_CTRL_ENABLE; + reg |= JZ_NAND_ECC_CTRL_RS; + + switch(mode) { + case NAND_ECC_READ: + reg &= ~JZ_NAND_ECC_CTRL_ENCODING; + break; + case NAND_ECC_WRITE: + reg |= JZ_NAND_ECC_CTRL_ENCODING; + break; + default: + break; + } + + writel(reg, nand->base + JZ_REG_NAND_ECC_CTRL); +} + +static int jz_nand_calculate_ecc_rs(struct mtd_info* mtd, const uint8_t* dat, + uint8_t *ecc_code) +{ + struct jz_nand *nand = mtd_to_jz_nand(mtd); + uint32_t reg, status; + int i; + + do { + status = readl(nand->base + JZ_REG_NAND_IRQ_STAT); + } while(!(status & JZ_NAND_STATUS_ENC_FINISH)); + + reg = readl(nand->base + JZ_REG_NAND_ECC_CTRL); + reg &= ~JZ_NAND_ECC_CTRL_ENABLE; + writel(reg, nand->base + JZ_REG_NAND_ECC_CTRL); + + for (i = 0; i < 9; ++i) { + ecc_code[i] = readb(nand->base + JZ_REG_NAND_PAR0 + i); + } + + return 0; +} + +static void correct_data(uint8_t *dat, int index, int mask) +{ + int offset = index & 0x7; + uint16_t data; + printk("correct: "); + + index += (index >> 3); + + data = dat[index]; + data |= dat[index+1] << 8; + + printk("0x%x -> ", data); + + mask ^= (data >> offset) & 0x1ff; + data &= ~(0x1ff << offset); + data |= (mask << offset); + + printk("0x%x\n", data); + + dat[index] = data & 0xff; + dat[index+1] = (data >> 8) & 0xff; +} + +static int jz_nand_correct_ecc_rs(struct mtd_info* mtd, uint8_t *dat, + uint8_t *read_ecc, uint8_t *calc_ecc) +{ + struct jz_nand *nand = mtd_to_jz_nand(mtd); + int i, error_count, index; + uint32_t reg, status, error; + + for(i = 0; i < 9; ++i) { + if (read_ecc[i] != 0xff) + break; + } + if (i == 9) { + for (i = 0; i < nand->chip.ecc.size; ++i) { + if (dat[i] != 0xff) + break; + } + if (i == nand->chip.ecc.size) + return 0; + } + + for(i = 0; i < 9; ++i) + writeb(read_ecc[i], nand->base + JZ_REG_NAND_PAR0 + i); + + reg = readl(nand->base + JZ_REG_NAND_ECC_CTRL); + reg |= JZ_NAND_ECC_CTRL_PAR_READY; + writel(reg, nand->base + JZ_REG_NAND_ECC_CTRL); + + do { + status = readl(nand->base + JZ_REG_NAND_IRQ_STAT); + } while (!(status & JZ_NAND_STATUS_DEC_FINISH)); + + reg = readl(nand->base + JZ_REG_NAND_ECC_CTRL); + reg &= ~JZ_NAND_ECC_CTRL_ENABLE; + writel(reg, nand->base + JZ_REG_NAND_ECC_CTRL); + + if (status & JZ_NAND_STATUS_ERROR) { + if (status & JZ_NAND_STATUS_UNCOR_ERROR) { + printk("uncorrectable ecc:"); + for(i = 0; i < 9; ++i) + printk(" 0x%x", read_ecc[i]); + printk("\n"); + printk("uncorrectable data:"); + for(i = 0; i < 32; ++i) + printk(" 0x%x", dat[i]); + printk("\n"); + return -1; + } + + error_count = (status & JZ_NAND_STATUS_ERR_COUNT) >> 29; + + printk("error_count: %d %x\n", error_count, status); + + for(i = 0; i < error_count; ++i) { + error = readl(nand->base + JZ_REG_NAND_ERR(i)); + index = ((error >> 16) & 0x1ff) - 1; + if (index >= 0 && index < 512) { + correct_data(dat, index, error & 0x1ff); + } + } + + return error_count; + } + + return 0; +} + + + +#ifdef CONFIG_MTD_CMDLINE_PARTS +static const char *part_probes[] = {"cmdline", NULL}; +#endif + +static int __devinit jz_nand_probe(struct platform_device *pdev) +{ + int ret; + struct jz_nand *nand; + struct nand_chip *chip; + struct mtd_info *mtd; + struct jz_nand_platform_data *pdata = pdev->dev.platform_data; +#ifdef CONFIG_MTD_PARTITIONS + struct mtd_partition *partition_info; + int num_partitions = 0; +#endif + + nand = kzalloc(sizeof(*nand), GFP_KERNEL); + if (!nand) { + dev_err(&pdev->dev, "Failed to allocate device structure.\n"); + return -ENOMEM; + } + + nand->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!nand->mem) { + dev_err(&pdev->dev, "Failed to get platform mmio memory\n"); + ret = -ENOENT; + goto err_free; + } + + nand->mem = request_mem_region(nand->mem->start, resource_size(nand->mem), + pdev->name); + + if (!nand->mem) { + dev_err(&pdev->dev, "Failed to request mmio memory region\n"); + ret = -EBUSY; + goto err_free; + } + + nand->base = ioremap(nand->mem->start, resource_size(nand->mem)); + + if (!nand->base) { + dev_err(&pdev->dev, "Faild to ioremap mmio memory region\n"); + ret = -EBUSY; + goto err_release_mem; + } + + if (pdata && gpio_is_valid(pdata->busy_gpio)) { + ret = gpio_request(pdata->busy_gpio, "jz nand busy line"); + if (ret) { + dev_err(&pdev->dev, "Failed to request busy gpio %d: %d\n", + pdata->busy_gpio, ret); + goto err_iounmap; + } + } + + mtd = &nand->mtd; + chip = &nand->chip; + mtd->priv = chip; + mtd->owner = THIS_MODULE; + mtd->name = "jz4740-nand"; + + chip->ecc.hwctl = jz_nand_hwctl; + + chip->ecc.calculate = jz_nand_calculate_ecc_rs; + chip->ecc.correct = jz_nand_correct_ecc_rs; + chip->ecc.mode = NAND_ECC_HW; + chip->ecc.size = 512; + chip->ecc.bytes = 9; + if (pdata) + chip->ecc.layout = pdata->ecc_layout; + + chip->chip_delay = 50; + chip->cmd_ctrl = jz_nand_cmd_ctrl; + + if (pdata && gpio_is_valid(pdata->busy_gpio)) + chip->dev_ready = jz_nand_dev_ready; + + chip->IO_ADDR_R = JZ_NAND_DATA_ADDR; + chip->IO_ADDR_W = JZ_NAND_DATA_ADDR; + + nand->pdata = pdata; + platform_set_drvdata(pdev, nand); + + ret = nand_scan_ident(mtd, 1); + if (ret) { + dev_err(&pdev->dev, "Failed to scan nand\n"); + goto err_gpio_free; + } + + if (pdata && pdata->ident_callback) { + pdata->ident_callback(pdev, chip, &pdata->partitions, &pdata->num_partitions); + } + + ret = nand_scan_tail(mtd); + if (ret) { + dev_err(&pdev->dev, "Failed to scan nand\n"); + goto err_gpio_free; + } + +#ifdef CONFIG_MTD_PARTITIONS +#ifdef CONFIG_MTD_CMDLINE_PARTS + num_partitions = parse_mtd_partitions(mtd, part_probes, + &partition_info, 0); +#endif + if (num_partitions <= 0 && pdata) { + num_partitions = pdata->num_partitions; + partition_info = pdata->partitions; + } + + if (num_partitions > 0) + ret = add_mtd_partitions(mtd, partition_info, num_partitions); + else +#endif + ret = add_mtd_device(mtd); + + if (ret) { + dev_err(&pdev->dev, "Failed to add mtd device\n"); + goto err_nand_release; + } + + dev_info(&pdev->dev, "Successfully registered JZ4740 NAND driver\n"); + + return 0; +err_nand_release: + nand_release(&nand->mtd); +err_gpio_free: + platform_set_drvdata(pdev, NULL); + gpio_free(pdata->busy_gpio); +err_iounmap: + iounmap(nand->base); +err_release_mem: + release_mem_region(nand->mem->start, resource_size(nand->mem)); +err_free: + kfree(nand); + return ret; +} + +static void __devexit jz_nand_remove(struct platform_device *pdev) +{ + struct jz_nand *nand = platform_get_drvdata(pdev); + + nand_release(&nand->mtd); + + iounmap(nand->base); + + release_mem_region(nand->mem->start, resource_size(nand->mem)); + + platform_set_drvdata(pdev, NULL); + kfree(nand); +} + +struct platform_driver jz_nand_driver = { + .probe = jz_nand_probe, + .remove = __devexit_p(jz_nand_probe), + .driver = { + .name = "jz4740-nand", + .owner = THIS_MODULE, + }, +}; + +static int __init jz_nand_init(void) +{ + return platform_driver_register(&jz_nand_driver); +} +module_init(jz_nand_init); + +static void __exit jz_nand_exit(void) +{ + platform_driver_unregister(&jz_nand_driver); +} +module_exit(jz_nand_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); +MODULE_DESCRIPTION("NAND controller driver for JZ4720/JZ4740 SoC"); +MODULE_ALIAS("platform:jz4740-nand"); +MODULE_ALIAS("platform:jz4720-nand"); |