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openwrtv3/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c
Felix Fietkau 9db9072d67 ar71xx: convert mikrotik routerboard support to UBI 
Remove the wget2nand script, drop the need for manual installation,
use sysupgrade instead.

There are now two different NAND images, one for 64 MiB flashes, the
other for >= 128 MiB

Signed-off-by: Felix Fietkau <nbd@nbd.name>
2017-01-16 20:40:12 +01:00

306 lines
7.1 KiB
C
Raw Blame History

/*
* 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 = (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;
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;
info->chip.chip_delay = 25;
info->chip.ecc.mode = NAND_ECC_SOFT;
info->chip.options = NAND_NO_SUBPAGE_WRITE;
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 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 = 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");
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