diff options
Diffstat (limited to 'target/linux/ar71xx/files/drivers/mtd/nand/rb91x_nand.c')
| -rw-r--r-- | target/linux/ar71xx/files/drivers/mtd/nand/rb91x_nand.c | 464 |
1 files changed, 0 insertions, 464 deletions
diff --git a/target/linux/ar71xx/files/drivers/mtd/nand/rb91x_nand.c b/target/linux/ar71xx/files/drivers/mtd/nand/rb91x_nand.c deleted file mode 100644 index 94e709b7e4..0000000000 --- a/target/linux/ar71xx/files/drivers/mtd/nand/rb91x_nand.c +++ /dev/null @@ -1,464 +0,0 @@ -/* - * NAND flash driver for the MikroTik RouterBOARD 91x series - * - * Copyright (C) 2013-2014 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/spinlock.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 <linux/gpio.h> -#include <linux/platform_data/rb91x_nand.h> - -#include <asm/mach-ath79/ar71xx_regs.h> -#include <asm/mach-ath79/ath79.h> - -#define DRV_DESC "NAND flash driver for the RouterBOARD 91x series" - -#define RB91X_NAND_NRWE BIT(12) - -#define RB91X_NAND_DATA_BITS (BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) |\ - BIT(13) | BIT(14) | BIT(15)) - -#define RB91X_NAND_INPUT_BITS (RB91X_NAND_DATA_BITS | RB91X_NAND_RDY) -#define RB91X_NAND_OUTPUT_BITS (RB91X_NAND_DATA_BITS | RB91X_NAND_NRWE) - -#define RB91X_NAND_LOW_DATA_MASK 0x1f -#define RB91X_NAND_HIGH_DATA_MASK 0xe0 -#define RB91X_NAND_HIGH_DATA_SHIFT 8 - -struct rb91x_nand_info { - struct nand_chip chip; -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) - struct mtd_info mtd; -#endif - struct device *dev; - - int gpio_nce; - int gpio_ale; - int gpio_cle; - int gpio_rdy; - int gpio_read; - int gpio_nrw; - int gpio_nle; -}; - -static inline struct rb91x_nand_info *mtd_to_rbinfo(struct mtd_info *mtd) -{ -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) - return container_of(mtd, struct rb91x_nand_info, mtd); -#else - struct nand_chip *chip = mtd_to_nand(mtd); - - return container_of(chip, struct rb91x_nand_info, chip); -#endif -} - -static struct mtd_info *rbinfo_to_mtd(struct rb91x_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 rb91x_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 rb91x_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 rb91x_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 rb91x_nand_ecclayout_ops = { - .ecc = rb91x_ooblayout_ecc, - .free = rb91x_ooblayout_free, -}; -#endif /* < 4.6 */ - -static struct mtd_partition rb91x_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 rb91x_nand_write(struct rb91x_nand_info *rbni, - const u8 *buf, - unsigned len) -{ - void __iomem *base = ath79_gpio_base; - u32 oe_reg; - u32 out_reg; - u32 out; - unsigned i; - - /* enable the latch */ - gpio_set_value_cansleep(rbni->gpio_nle, 0); - - oe_reg = __raw_readl(base + AR71XX_GPIO_REG_OE); - out_reg = __raw_readl(base + AR71XX_GPIO_REG_OUT); - - /* set data lines to output mode */ - __raw_writel(oe_reg & ~(RB91X_NAND_DATA_BITS | RB91X_NAND_NRWE), - base + AR71XX_GPIO_REG_OE); - - out = out_reg & ~(RB91X_NAND_DATA_BITS | RB91X_NAND_NRWE); - for (i = 0; i != len; i++) { - u32 data; - - data = (buf[i] & RB91X_NAND_HIGH_DATA_MASK) << - RB91X_NAND_HIGH_DATA_SHIFT; - data |= buf[i] & RB91X_NAND_LOW_DATA_MASK; - data |= out; - __raw_writel(data, base + AR71XX_GPIO_REG_OUT); - - /* deactivate WE line */ - data |= RB91X_NAND_NRWE; - __raw_writel(data, base + AR71XX_GPIO_REG_OUT); - /* flush write */ - __raw_readl(base + AR71XX_GPIO_REG_OUT); - } - - /* restore registers */ - __raw_writel(out_reg, base + AR71XX_GPIO_REG_OUT); - __raw_writel(oe_reg, base + AR71XX_GPIO_REG_OE); - /* flush write */ - __raw_readl(base + AR71XX_GPIO_REG_OUT); - - /* disable the latch */ - gpio_set_value_cansleep(rbni->gpio_nle, 1); -} - -static void rb91x_nand_read(struct rb91x_nand_info *rbni, - u8 *read_buf, - unsigned len) -{ - void __iomem *base = ath79_gpio_base; - u32 oe_reg; - u32 out_reg; - unsigned i; - - /* enable read mode */ - gpio_set_value_cansleep(rbni->gpio_read, 1); - - /* enable latch */ - gpio_set_value_cansleep(rbni->gpio_nle, 0); - - /* save registers */ - oe_reg = __raw_readl(base + AR71XX_GPIO_REG_OE); - out_reg = __raw_readl(base + AR71XX_GPIO_REG_OUT); - - /* set data lines to input mode */ - __raw_writel(oe_reg | RB91X_NAND_DATA_BITS, - base + AR71XX_GPIO_REG_OE); - - for (i = 0; i < len; i++) { - u32 in; - u8 data; - - /* activate RE line */ - __raw_writel(RB91X_NAND_NRWE, base + AR71XX_GPIO_REG_CLEAR); - /* flush write */ - __raw_readl(base + AR71XX_GPIO_REG_CLEAR); - - /* read input lines */ - in = __raw_readl(base + AR71XX_GPIO_REG_IN); - - /* deactivate RE line */ - __raw_writel(RB91X_NAND_NRWE, base + AR71XX_GPIO_REG_SET); - - data = (in & RB91X_NAND_LOW_DATA_MASK); - data |= (in >> RB91X_NAND_HIGH_DATA_SHIFT) & - RB91X_NAND_HIGH_DATA_MASK; - - read_buf[i] = data; - } - - /* restore registers */ - __raw_writel(out_reg, base + AR71XX_GPIO_REG_OUT); - __raw_writel(oe_reg, base + AR71XX_GPIO_REG_OE); - /* flush write */ - __raw_readl(base + AR71XX_GPIO_REG_OUT); - - /* disable latch */ - gpio_set_value_cansleep(rbni->gpio_nle, 1); - - /* disable read mode */ - gpio_set_value_cansleep(rbni->gpio_read, 0); -} - -static int rb91x_nand_dev_ready(struct mtd_info *mtd) -{ - struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd); - - return gpio_get_value_cansleep(rbni->gpio_rdy); -} - -static void rb91x_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, - unsigned int ctrl) -{ - struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd); - - if (ctrl & NAND_CTRL_CHANGE) { - gpio_set_value_cansleep(rbni->gpio_cle, - (ctrl & NAND_CLE) ? 1 : 0); - gpio_set_value_cansleep(rbni->gpio_ale, - (ctrl & NAND_ALE) ? 1 : 0); - gpio_set_value_cansleep(rbni->gpio_nce, - (ctrl & NAND_NCE) ? 0 : 1); - } - - if (cmd != NAND_CMD_NONE) { - u8 t = cmd; - - rb91x_nand_write(rbni, &t, 1); - } -} - -static u8 rb91x_nand_read_byte(struct mtd_info *mtd) -{ - struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd); - u8 data = 0xff; - - rb91x_nand_read(rbni, &data, 1); - - return data; -} - -static void rb91x_nand_read_buf(struct mtd_info *mtd, u8 *buf, int len) -{ - struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd); - - rb91x_nand_read(rbni, buf, len); -} - -static void rb91x_nand_write_buf(struct mtd_info *mtd, const u8 *buf, int len) -{ - struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd); - - rb91x_nand_write(rbni, buf, len); -} - -static int rb91x_nand_gpio_init(struct rb91x_nand_info *info) -{ - int ret; - - /* - * Ensure that the LATCH is disabled before initializing - * control lines. - */ - ret = devm_gpio_request_one(info->dev, info->gpio_nle, - GPIOF_OUT_INIT_HIGH, "LATCH enable"); - if (ret) - return ret; - - ret = devm_gpio_request_one(info->dev, info->gpio_nce, - GPIOF_OUT_INIT_HIGH, "NAND nCE"); - if (ret) - return ret; - - ret = devm_gpio_request_one(info->dev, info->gpio_nrw, - GPIOF_OUT_INIT_HIGH, "NAND nRW"); - if (ret) - return ret; - - ret = devm_gpio_request_one(info->dev, info->gpio_cle, - GPIOF_OUT_INIT_LOW, "NAND CLE"); - if (ret) - return ret; - - ret = devm_gpio_request_one(info->dev, info->gpio_ale, - GPIOF_OUT_INIT_LOW, "NAND ALE"); - if (ret) - return ret; - - ret = devm_gpio_request_one(info->dev, info->gpio_read, - GPIOF_OUT_INIT_LOW, "NAND READ"); - if (ret) - return ret; - - ret = devm_gpio_request_one(info->dev, info->gpio_rdy, - GPIOF_IN, "NAND RDY"); - return ret; -} - -static int rb91x_nand_probe(struct platform_device *pdev) -{ - struct rb91x_nand_info *rbni; - struct rb91x_nand_platform_data *pdata; - struct mtd_info *mtd; - int ret; - - pr_info(DRV_DESC "\n"); - - pdata = dev_get_platdata(&pdev->dev); - if (!pdata) - return -EINVAL; - - rbni = devm_kzalloc(&pdev->dev, sizeof(*rbni), GFP_KERNEL); - if (!rbni) - return -ENOMEM; - - rbni->dev = &pdev->dev; - rbni->gpio_nce = pdata->gpio_nce; - rbni->gpio_ale = pdata->gpio_ale; - rbni->gpio_cle = pdata->gpio_cle; - rbni->gpio_read = pdata->gpio_read; - rbni->gpio_nrw = pdata->gpio_nrw; - rbni->gpio_rdy = pdata->gpio_rdy; - rbni->gpio_nle = pdata->gpio_nle; - - rbni->chip.priv = &rbni; - mtd = rbinfo_to_mtd(rbni); - -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) - mtd->priv = &rbni->chip; -#endif - mtd->owner = THIS_MODULE; - - rbni->chip.cmd_ctrl = rb91x_nand_cmd_ctrl; - rbni->chip.dev_ready = rb91x_nand_dev_ready; - rbni->chip.read_byte = rb91x_nand_read_byte; - rbni->chip.write_buf = rb91x_nand_write_buf; - rbni->chip.read_buf = rb91x_nand_read_buf; - - rbni->chip.chip_delay = 25; - rbni->chip.ecc.mode = NAND_ECC_SOFT; -#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0) - rbni->chip.ecc.algo = NAND_ECC_HAMMING; -#endif - rbni->chip.options = NAND_NO_SUBPAGE_WRITE; - - platform_set_drvdata(pdev, rbni); - - ret = rb91x_nand_gpio_init(rbni); - if (ret) - return ret; - - ret = nand_scan_ident(mtd, 1, NULL); - if (ret) - return ret; - - if (mtd->writesize == 512) -#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0) - rbni->chip.ecc.layout = &rb91x_nand_ecclayout; -#else - mtd_set_ooblayout(mtd, &rb91x_nand_ecclayout_ops); -#endif - - ret = nand_scan_tail(mtd); - if (ret) - return ret; - - ret = mtd_device_register(mtd, rb91x_nand_partitions, - ARRAY_SIZE(rb91x_nand_partitions)); - if (ret) - goto err_release_nand; - - return 0; - -err_release_nand: - nand_release(&rbni->chip); - return ret; -} - -static int rb91x_nand_remove(struct platform_device *pdev) -{ - struct rb91x_nand_info *info = platform_get_drvdata(pdev); - - nand_release(&info->chip); - - return 0; -} - -static struct platform_driver rb91x_nand_driver = { - .probe = rb91x_nand_probe, - .remove = rb91x_nand_remove, - .driver = { - .name = RB91X_NAND_DRIVER_NAME, - .owner = THIS_MODULE, - }, -}; - -module_platform_driver(rb91x_nand_driver); - -MODULE_DESCRIPTION(DRV_DESC); -MODULE_VERSION(DRV_VERSION); -MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); -MODULE_LICENSE("GPL v2"); |