diff options
Diffstat (limited to 'target/linux/ar71xx/files/drivers/mtd/nand/rb750_nand.c')
| -rw-r--r-- | target/linux/ar71xx/files/drivers/mtd/nand/rb750_nand.c | 440 |
1 files changed, 0 insertions, 440 deletions
diff --git a/target/linux/ar71xx/files/drivers/mtd/nand/rb750_nand.c b/target/linux/ar71xx/files/drivers/mtd/nand/rb750_nand.c deleted file mode 100644 index a578c54ad3..0000000000 --- a/target/linux/ar71xx/files/drivers/mtd/nand/rb750_nand.c +++ /dev/null @@ -1,440 +0,0 @@ -/* - * NAND flash driver for the MikroTik RouterBOARD 750 - * - * Copyright (C) 2010-2012 Gabor Juhos <juhosg@openwrt.org> - * - * 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/version.h> -#include <linux/kernel.h> -#include <linux/module.h> -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,14,0) -#include <linux/mtd/nand.h> -#else -#include <linux/mtd/rawnand.h> -#endif -#include <linux/mtd/mtd.h> -#include <linux/mtd/partitions.h> -#include <linux/platform_device.h> -#include <linux/io.h> -#include <linux/slab.h> - -#include <asm/mach-ath79/ar71xx_regs.h> -#include <asm/mach-ath79/ath79.h> -#include <asm/mach-ath79/mach-rb750.h> - -#define DRV_NAME "rb750-nand" -#define DRV_VERSION "0.1.0" -#define DRV_DESC "NAND flash driver for the RouterBOARD 750" - -#define RB750_NAND_IO0 BIT(RB750_GPIO_NAND_IO0) -#define RB750_NAND_ALE BIT(RB750_GPIO_NAND_ALE) -#define RB750_NAND_CLE BIT(RB750_GPIO_NAND_CLE) -#define RB750_NAND_NRE BIT(RB750_GPIO_NAND_NRE) -#define RB750_NAND_NWE BIT(RB750_GPIO_NAND_NWE) -#define RB750_NAND_RDY BIT(RB750_GPIO_NAND_RDY) - -#define RB750_NAND_DATA_SHIFT 1 -#define RB750_NAND_DATA_BITS (0xff << RB750_NAND_DATA_SHIFT) -#define RB750_NAND_INPUT_BITS (RB750_NAND_DATA_BITS | RB750_NAND_RDY) -#define RB750_NAND_OUTPUT_BITS (RB750_NAND_ALE | RB750_NAND_CLE | \ - RB750_NAND_NRE | RB750_NAND_NWE) - -struct rb750_nand_info { - struct nand_chip chip; -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) - struct mtd_info mtd; -#endif - struct rb7xx_nand_platform_data *pdata; -}; - -static inline struct rb750_nand_info *mtd_to_rbinfo(struct mtd_info *mtd) -{ -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) - return container_of(mtd, struct rb750_nand_info, mtd); -#else - struct nand_chip *chip = mtd_to_nand(mtd); - - return container_of(chip, struct rb750_nand_info, chip); -#endif -} - -static struct mtd_info *rbinfo_to_mtd(struct rb750_nand_info *nfc) -{ -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) - return &nfc->mtd; -#else - return nand_to_mtd(&nfc->chip); -#endif -} - -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) -/* - * 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 rb750_nand_ecclayout = { - .eccbytes = 6, - .eccpos = { 8, 9, 10, 13, 14, 15 }, - .oobavail = 9, - .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } } -}; - -#else - -static int rb750_ooblayout_ecc(struct mtd_info *mtd, int section, - struct mtd_oob_region *oobregion) -{ - switch (section) { - case 0: - oobregion->offset = 8; - oobregion->length = 3; - return 0; - case 1: - oobregion->offset = 13; - oobregion->length = 3; - return 0; - default: - return -ERANGE; - } -} - -static int rb750_ooblayout_free(struct mtd_info *mtd, int section, - struct mtd_oob_region *oobregion) -{ - switch (section) { - case 0: - oobregion->offset = 0; - oobregion->length = 4; - return 0; - case 1: - oobregion->offset = 4; - oobregion->length = 1; - return 0; - case 2: - oobregion->offset = 6; - oobregion->length = 2; - return 0; - case 3: - oobregion->offset = 11; - oobregion->length = 2; - return 0; - default: - return -ERANGE; - } -} - -static const struct mtd_ooblayout_ops rb750_nand_ecclayout_ops = { - .ecc = rb750_ooblayout_ecc, - .free = rb750_ooblayout_free, -}; -#endif /* < 4.6 */ - -static struct mtd_partition rb750_nand_partitions[] = { - { - .name = "booter", - .offset = 0, - .size = (256 * 1024), - .mask_flags = MTD_WRITEABLE, - }, { - .name = "kernel", - .offset = (256 * 1024), - .size = (4 * 1024 * 1024) - (256 * 1024), - }, { - .name = "ubi", - .offset = MTDPART_OFS_NXTBLK, - .size = MTDPART_SIZ_FULL, - }, -}; - -static void rb750_nand_write(const u8 *buf, unsigned len) -{ - void __iomem *base = ath79_gpio_base; - u32 out; - u32 t; - unsigned i; - - /* set data lines to output mode */ - t = __raw_readl(base + AR71XX_GPIO_REG_OE); - __raw_writel(t | RB750_NAND_DATA_BITS, base + AR71XX_GPIO_REG_OE); - - out = __raw_readl(base + AR71XX_GPIO_REG_OUT); - out &= ~(RB750_NAND_DATA_BITS | RB750_NAND_NWE); - for (i = 0; i != len; i++) { - u32 data; - - data = buf[i]; - data <<= RB750_NAND_DATA_SHIFT; - data |= out; - __raw_writel(data, base + AR71XX_GPIO_REG_OUT); - - __raw_writel(data | RB750_NAND_NWE, base + AR71XX_GPIO_REG_OUT); - /* flush write */ - __raw_readl(base + AR71XX_GPIO_REG_OUT); - } - - /* set data lines to input mode */ - t = __raw_readl(base + AR71XX_GPIO_REG_OE); - __raw_writel(t & ~RB750_NAND_DATA_BITS, base + AR71XX_GPIO_REG_OE); - /* flush write */ - __raw_readl(base + AR71XX_GPIO_REG_OE); -} - -static void rb750_nand_read(u8 *read_buf, unsigned len) -{ - void __iomem *base = ath79_gpio_base; - unsigned i; - - for (i = 0; i < len; i++) { - u8 data; - - /* activate RE line */ - __raw_writel(RB750_NAND_NRE, base + AR71XX_GPIO_REG_CLEAR); - /* flush write */ - __raw_readl(base + AR71XX_GPIO_REG_CLEAR); - - /* read input lines */ - data = __raw_readl(base + AR71XX_GPIO_REG_IN) >> - RB750_NAND_DATA_SHIFT; - - /* deactivate RE line */ - __raw_writel(RB750_NAND_NRE, base + AR71XX_GPIO_REG_SET); - - read_buf[i] = data; - } -} - -static void rb750_nand_select_chip(struct mtd_info *mtd, int chip) -{ - struct rb750_nand_info *rbinfo = mtd_to_rbinfo(mtd); - void __iomem *base = ath79_gpio_base; - u32 t; - - if (chip >= 0) { - rbinfo->pdata->enable_pins(); - - /* set input mode for data lines */ - t = __raw_readl(base + AR71XX_GPIO_REG_OE); - __raw_writel(t & ~RB750_NAND_INPUT_BITS, - base + AR71XX_GPIO_REG_OE); - - /* deactivate RE and WE lines */ - __raw_writel(RB750_NAND_NRE | RB750_NAND_NWE, - base + AR71XX_GPIO_REG_SET); - /* flush write */ - (void) __raw_readl(base + AR71XX_GPIO_REG_SET); - - /* activate CE line */ - __raw_writel(rbinfo->pdata->nce_line, - base + AR71XX_GPIO_REG_CLEAR); - } else { - /* deactivate CE line */ - __raw_writel(rbinfo->pdata->nce_line, - base + AR71XX_GPIO_REG_SET); - /* flush write */ - (void) __raw_readl(base + AR71XX_GPIO_REG_SET); - - t = __raw_readl(base + AR71XX_GPIO_REG_OE); - __raw_writel(t | RB750_NAND_IO0 | RB750_NAND_RDY, - base + AR71XX_GPIO_REG_OE); - - rbinfo->pdata->disable_pins(); - } -} - -static int rb750_nand_dev_ready(struct mtd_info *mtd) -{ - void __iomem *base = ath79_gpio_base; - - return !!(__raw_readl(base + AR71XX_GPIO_REG_IN) & RB750_NAND_RDY); -} - -static void rb750_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, - unsigned int ctrl) -{ - if (ctrl & NAND_CTRL_CHANGE) { - void __iomem *base = ath79_gpio_base; - u32 t; - - t = __raw_readl(base + AR71XX_GPIO_REG_OUT); - - t &= ~(RB750_NAND_CLE | RB750_NAND_ALE); - t |= (ctrl & NAND_CLE) ? RB750_NAND_CLE : 0; - t |= (ctrl & NAND_ALE) ? RB750_NAND_ALE : 0; - - __raw_writel(t, base + AR71XX_GPIO_REG_OUT); - /* flush write */ - __raw_readl(base + AR71XX_GPIO_REG_OUT); - } - - if (cmd != NAND_CMD_NONE) { - u8 t = cmd; - rb750_nand_write(&t, 1); - } -} - -static u8 rb750_nand_read_byte(struct mtd_info *mtd) -{ - u8 data = 0; - rb750_nand_read(&data, 1); - return data; -} - -static void rb750_nand_read_buf(struct mtd_info *mtd, u8 *buf, int len) -{ - rb750_nand_read(buf, len); -} - -static void rb750_nand_write_buf(struct mtd_info *mtd, const u8 *buf, int len) -{ - rb750_nand_write(buf, len); -} - -static void __init rb750_nand_gpio_init(struct rb750_nand_info *info) -{ - void __iomem *base = ath79_gpio_base; - u32 out; - u32 t; - - out = __raw_readl(base + AR71XX_GPIO_REG_OUT); - - /* setup output levels */ - __raw_writel(RB750_NAND_NCE | RB750_NAND_NRE | RB750_NAND_NWE, - base + AR71XX_GPIO_REG_SET); - - __raw_writel(RB750_NAND_ALE | RB750_NAND_CLE, - base + AR71XX_GPIO_REG_CLEAR); - - /* setup input lines */ - t = __raw_readl(base + AR71XX_GPIO_REG_OE); - __raw_writel(t & ~(RB750_NAND_INPUT_BITS), base + AR71XX_GPIO_REG_OE); - - /* setup output lines */ - t = __raw_readl(base + AR71XX_GPIO_REG_OE); - t |= RB750_NAND_OUTPUT_BITS; - t |= info->pdata->nce_line; - __raw_writel(t, base + AR71XX_GPIO_REG_OE); - - info->pdata->latch_change(~out & RB750_NAND_IO0, out & RB750_NAND_IO0); -} - -static int rb750_nand_probe(struct platform_device *pdev) -{ - struct rb750_nand_info *info; - struct rb7xx_nand_platform_data *pdata; - struct mtd_info *mtd; - int ret; - - printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n"); - - pdata = pdev->dev.platform_data; - if (!pdata) - return -EINVAL; - - info = kzalloc(sizeof(*info), GFP_KERNEL); - if (!info) - return -ENOMEM; - - info->chip.priv = &info; - - mtd = rbinfo_to_mtd(info); -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) - mtd->priv = &info->chip; -#endif - mtd->owner = THIS_MODULE; - - info->chip.select_chip = rb750_nand_select_chip; - info->chip.cmd_ctrl = rb750_nand_cmd_ctrl; - info->chip.dev_ready = rb750_nand_dev_ready; - info->chip.read_byte = rb750_nand_read_byte; - info->chip.write_buf = rb750_nand_write_buf; - info->chip.read_buf = rb750_nand_read_buf; - - info->chip.chip_delay = 25; - info->chip.ecc.mode = NAND_ECC_SOFT; -#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0) - info->chip.ecc.algo = NAND_ECC_HAMMING; -#endif - info->chip.options = NAND_NO_SUBPAGE_WRITE; - - info->pdata = pdata; - - platform_set_drvdata(pdev, info); - - rb750_nand_gpio_init(info); - - ret = nand_scan_ident(mtd, 1, NULL); - if (ret) { - ret = -ENXIO; - goto err_free_info; - } - - if (mtd->writesize == 512) -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) - info->chip.ecc.layout = &rb750_nand_ecclayout; -#else - mtd_set_ooblayout(mtd, &rb750_nand_ecclayout_ops); -#endif - - ret = nand_scan_tail(mtd); - if (ret) { - return -ENXIO; - goto err_set_drvdata; - } - - ret = mtd_device_register(mtd, rb750_nand_partitions, - ARRAY_SIZE(rb750_nand_partitions)); - if (ret) - goto err_release_nand; - - return 0; - -err_release_nand: - nand_release(&info->chip); -err_set_drvdata: - platform_set_drvdata(pdev, NULL); -err_free_info: - kfree(info); - return ret; -} - -static int rb750_nand_remove(struct platform_device *pdev) -{ - struct rb750_nand_info *info = platform_get_drvdata(pdev); - - nand_release(&info->chip); - platform_set_drvdata(pdev, NULL); - kfree(info); - - return 0; -} - -static struct platform_driver rb750_nand_driver = { - .probe = rb750_nand_probe, - .remove = rb750_nand_remove, - .driver = { - .name = DRV_NAME, - .owner = THIS_MODULE, - }, -}; - -static int __init rb750_nand_init(void) -{ - return platform_driver_register(&rb750_nand_driver); -} - -static void __exit rb750_nand_exit(void) -{ - platform_driver_unregister(&rb750_nand_driver); -} - -module_init(rb750_nand_init); -module_exit(rb750_nand_exit); - -MODULE_DESCRIPTION(DRV_DESC); -MODULE_VERSION(DRV_VERSION); -MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); -MODULE_LICENSE("GPL v2"); |