+++ /dev/null
-/*
- * 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");
projects / openwrt / openwrt.git / blobdiff