diff options
Diffstat (limited to 'target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c')
| -rw-r--r-- | target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c | 309 |
1 files changed, 309 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..1cb8f8240 --- /dev/null +++ b/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c @@ -0,0 +1,309 @@ +/* + * NAND flash driver for the MikroTik RouterBoard 4xx series + * + * Copyright (C) 2008-2011 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/kernel.h> +#include <linux/module.h> +#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 <linux/slab.h> + +#include <asm/mach-ath79/ath79.h> +#include <asm/mach-ath79/rb4xx_cpld.h> + +#define DRV_NAME "rb4xx-nand" +#define DRV_VERSION "0.2.0" +#define DRV_DESC "NAND flash driver for RouterBoard 4xx series" + +#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; + 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 = "booter", + .offset = 0, + .size = (256 * 1024), + .mask_flags = MTD_WRITEABLE, + }, + { + .name = "kernel", + .offset = (256 * 1024), + .size = (6 * 1024 * 1024) - (256 * 1024), + }, + { + .name = "rootfs", + .offset = MTDPART_OFS_NXTBLK, + .size = MTDPART_SIZ_FULL, + }, +}; + +static int rb4xx_nand_dev_ready(struct mtd_info *mtd) +{ + return gpio_get_value_cansleep(RB4XX_NAND_GPIO_READY); +} + +static void rb4xx_nand_write_cmd(unsigned char cmd) +{ + unsigned char data = cmd; + int err; + + err = rb4xx_cpld_write(&data, 1); + if (err) + pr_err("rb4xx_nand: write cmd failed, err=%d\n", err); +} + +static void rb4xx_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, + unsigned int ctrl) +{ + if (ctrl & NAND_CTRL_CHANGE) { + gpio_set_value_cansleep(RB4XX_NAND_GPIO_CLE, + (ctrl & NAND_CLE) ? 1 : 0); + gpio_set_value_cansleep(RB4XX_NAND_GPIO_ALE, + (ctrl & NAND_ALE) ? 1 : 0); + gpio_set_value_cansleep(RB4XX_NAND_GPIO_NCE, + (ctrl & NAND_NCE) ? 0 : 1); + } + + if (cmd != NAND_CMD_NONE) + rb4xx_nand_write_cmd(cmd); +} + +static unsigned char rb4xx_nand_read_byte(struct mtd_info *mtd) +{ + unsigned char data = 0; + int err; + + err = rb4xx_cpld_read(&data, NULL, 1); + if (err) { + pr_err("rb4xx_nand: read data failed, err=%d\n", err); + data = 0xff; + } + + return data; +} + +static void rb4xx_nand_write_buf(struct mtd_info *mtd, const unsigned char *buf, + int len) +{ + int err; + + err = rb4xx_cpld_write(buf, len); + if (err) + pr_err("rb4xx_nand: write buf failed, err=%d\n", err); +} + +static void rb4xx_nand_read_buf(struct mtd_info *mtd, unsigned char *buf, + int len) +{ + int err; + + err = rb4xx_cpld_read(buf, NULL, len); + if (err) + pr_err("rb4xx_nand: read buf failed, err=%d\n", err); +} + +static int __devinit 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_READY, "NAND RDY"); + if (ret) { + dev_err(&pdev->dev, "unable to request gpio %d\n", + RB4XX_NAND_GPIO_READY); + goto err; + } + + 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; + } + + 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; + } + + 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; + } + + 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; + } + + 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_NCE, "NAND NCE"); + if (ret) { + dev_err(&pdev->dev, "unable to request gpio %d\n", + RB4XX_NAND_GPIO_NCE); + goto err_free_gpio_cle; + } + + ret = gpio_direction_output(RB4XX_NAND_GPIO_NCE, 1); + if (ret) { + 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) { + dev_err(&pdev->dev, "rb4xx-nand: no memory for private data\n"); + ret = -ENOMEM; + goto err_free_gpio_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; +#if 0 + info->chip.verify_buf = rb4xx_nand_verify_buf; +#endif + + 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, NULL); + 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; + } + + mtd_device_register(&info->mtd, rb4xx_nand_partitions, + ARRAY_SIZE(rb4xx_nand_partitions)); + 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_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; +} + +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); + 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; +} + +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"); |