+++ /dev/null
-/*
- * 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/version.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.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/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;
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
- struct mtd_info mtd;
-#endif
-};
-
-static inline struct rb4xx_nand_info *mtd_to_rbinfo(struct mtd_info *mtd)
-{
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
- return container_of(mtd, struct rb4xx_nand_info, mtd);
-#else
- struct nand_chip *chip = mtd_to_nand(mtd);
-
- return container_of(chip, struct rb4xx_nand_info, chip);
-#endif
-}
-
-static struct mtd_info *rbinfo_to_mtd(struct rb4xx_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 rb4xx_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 rb4xx_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 rb4xx_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 rb4xx_nand_ecclayout_ops = {
- .ecc = rb4xx_ooblayout_ecc,
- .free = rb4xx_ooblayout_free,
-};
-#endif /* < 4.6 */
-
-static struct mtd_partition rb4xx_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 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, 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, len);
- if (err)
- pr_err("rb4xx_nand: read buf failed, err=%d\n", err);
-}
-
-static int rb4xx_nand_probe(struct platform_device *pdev)
-{
- struct rb4xx_nand_info *info;
- struct mtd_info *mtd;
- 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;
- 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.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;
-
- 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;
-
- platform_set_drvdata(pdev, 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 = &rb4xx_nand_ecclayout;
-#else
- mtd_set_ooblayout(mtd, &rb4xx_nand_ecclayout_ops);
-#endif
-
- ret = nand_scan_tail(mtd);
- if (ret) {
- return -ENXIO;
- goto err_set_drvdata;
- }
-
- mtd_device_register(mtd, rb4xx_nand_partitions,
- ARRAY_SIZE(rb4xx_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);
-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 rb4xx_nand_remove(struct platform_device *pdev)
-{
- struct rb4xx_nand_info *info = platform_get_drvdata(pdev);
-
- nand_release(&info->chip);
- 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 = 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");
projects / openwrt / staging / stintel.git / blobdiff