mirror of https://github.com/hak5/openwrt.git
310 lines
7.2 KiB
C
310 lines
7.2 KiB
C
/*
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* NAND flash driver for the MikroTik RouterBoard 4xx series
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*
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* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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*
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* This file was based on the driver for Linux 2.6.22 published by
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* MikroTik for their RouterBoard 4xx series devices.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <asm/mach-ath79/ath79.h>
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#include <asm/mach-ath79/rb4xx_cpld.h>
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#define DRV_NAME "rb4xx-nand"
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#define DRV_VERSION "0.2.0"
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#define DRV_DESC "NAND flash driver for RouterBoard 4xx series"
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#define RB4XX_NAND_GPIO_READY 5
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#define RB4XX_NAND_GPIO_ALE 37
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#define RB4XX_NAND_GPIO_CLE 38
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#define RB4XX_NAND_GPIO_NCE 39
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struct rb4xx_nand_info {
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struct nand_chip chip;
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struct mtd_info mtd;
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};
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/*
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* We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader
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* will not be able to find the kernel that we load.
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*/
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static struct nand_ecclayout rb4xx_nand_ecclayout = {
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.eccbytes = 6,
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.eccpos = { 8, 9, 10, 13, 14, 15 },
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.oobavail = 9,
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.oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
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};
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static struct mtd_partition rb4xx_nand_partitions[] = {
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{
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.name = "booter",
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.offset = 0,
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.size = (256 * 1024),
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.mask_flags = MTD_WRITEABLE,
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},
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{
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.name = "kernel",
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.offset = (256 * 1024),
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.size = (6 * 1024 * 1024) - (256 * 1024),
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},
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{
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.name = "rootfs",
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.offset = MTDPART_OFS_NXTBLK,
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.size = MTDPART_SIZ_FULL,
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},
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};
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static int rb4xx_nand_dev_ready(struct mtd_info *mtd)
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{
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return gpio_get_value_cansleep(RB4XX_NAND_GPIO_READY);
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}
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static void rb4xx_nand_write_cmd(unsigned char cmd)
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{
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unsigned char data = cmd;
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int err;
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err = rb4xx_cpld_write(&data, 1);
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if (err)
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pr_err("rb4xx_nand: write cmd failed, err=%d\n", err);
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}
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static void rb4xx_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
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unsigned int ctrl)
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{
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if (ctrl & NAND_CTRL_CHANGE) {
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gpio_set_value_cansleep(RB4XX_NAND_GPIO_CLE,
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(ctrl & NAND_CLE) ? 1 : 0);
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gpio_set_value_cansleep(RB4XX_NAND_GPIO_ALE,
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(ctrl & NAND_ALE) ? 1 : 0);
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gpio_set_value_cansleep(RB4XX_NAND_GPIO_NCE,
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(ctrl & NAND_NCE) ? 0 : 1);
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}
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if (cmd != NAND_CMD_NONE)
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rb4xx_nand_write_cmd(cmd);
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}
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static unsigned char rb4xx_nand_read_byte(struct mtd_info *mtd)
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{
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unsigned char data = 0;
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int err;
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err = rb4xx_cpld_read(&data, NULL, 1);
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if (err) {
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pr_err("rb4xx_nand: read data failed, err=%d\n", err);
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data = 0xff;
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}
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return data;
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}
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static void rb4xx_nand_write_buf(struct mtd_info *mtd, const unsigned char *buf,
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int len)
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{
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int err;
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err = rb4xx_cpld_write(buf, len);
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if (err)
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pr_err("rb4xx_nand: write buf failed, err=%d\n", err);
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}
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static void rb4xx_nand_read_buf(struct mtd_info *mtd, unsigned char *buf,
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int len)
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{
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int err;
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err = rb4xx_cpld_read(buf, NULL, len);
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if (err)
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pr_err("rb4xx_nand: read buf failed, err=%d\n", err);
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}
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static int __devinit rb4xx_nand_probe(struct platform_device *pdev)
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{
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struct rb4xx_nand_info *info;
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int ret;
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printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
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ret = gpio_request(RB4XX_NAND_GPIO_READY, "NAND RDY");
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if (ret) {
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dev_err(&pdev->dev, "unable to request gpio %d\n",
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RB4XX_NAND_GPIO_READY);
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goto err;
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}
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ret = gpio_direction_input(RB4XX_NAND_GPIO_READY);
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if (ret) {
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dev_err(&pdev->dev, "unable to set input mode on gpio %d\n",
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RB4XX_NAND_GPIO_READY);
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goto err_free_gpio_ready;
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}
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ret = gpio_request(RB4XX_NAND_GPIO_ALE, "NAND ALE");
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if (ret) {
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dev_err(&pdev->dev, "unable to request gpio %d\n",
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RB4XX_NAND_GPIO_ALE);
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goto err_free_gpio_ready;
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}
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ret = gpio_direction_output(RB4XX_NAND_GPIO_ALE, 0);
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if (ret) {
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dev_err(&pdev->dev, "unable to set output mode on gpio %d\n",
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RB4XX_NAND_GPIO_ALE);
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goto err_free_gpio_ale;
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}
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ret = gpio_request(RB4XX_NAND_GPIO_CLE, "NAND CLE");
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if (ret) {
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dev_err(&pdev->dev, "unable to request gpio %d\n",
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RB4XX_NAND_GPIO_CLE);
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goto err_free_gpio_ale;
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}
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ret = gpio_direction_output(RB4XX_NAND_GPIO_CLE, 0);
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if (ret) {
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dev_err(&pdev->dev, "unable to set output mode on gpio %d\n",
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RB4XX_NAND_GPIO_CLE);
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goto err_free_gpio_cle;
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}
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ret = gpio_request(RB4XX_NAND_GPIO_NCE, "NAND NCE");
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if (ret) {
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dev_err(&pdev->dev, "unable to request gpio %d\n",
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RB4XX_NAND_GPIO_NCE);
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goto err_free_gpio_cle;
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}
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ret = gpio_direction_output(RB4XX_NAND_GPIO_NCE, 1);
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if (ret) {
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dev_err(&pdev->dev, "unable to set output mode on gpio %d\n",
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RB4XX_NAND_GPIO_ALE);
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goto err_free_gpio_nce;
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}
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info) {
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dev_err(&pdev->dev, "rb4xx-nand: no memory for private data\n");
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ret = -ENOMEM;
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goto err_free_gpio_nce;
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}
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info->chip.priv = &info;
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info->mtd.priv = &info->chip;
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info->mtd.owner = THIS_MODULE;
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info->chip.cmd_ctrl = rb4xx_nand_cmd_ctrl;
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info->chip.dev_ready = rb4xx_nand_dev_ready;
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info->chip.read_byte = rb4xx_nand_read_byte;
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info->chip.write_buf = rb4xx_nand_write_buf;
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info->chip.read_buf = rb4xx_nand_read_buf;
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#if 0
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info->chip.verify_buf = rb4xx_nand_verify_buf;
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#endif
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info->chip.chip_delay = 25;
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info->chip.ecc.mode = NAND_ECC_SOFT;
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info->chip.options |= NAND_NO_AUTOINCR;
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platform_set_drvdata(pdev, info);
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ret = nand_scan_ident(&info->mtd, 1, NULL);
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if (ret) {
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ret = -ENXIO;
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goto err_free_info;
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}
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if (info->mtd.writesize == 512)
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info->chip.ecc.layout = &rb4xx_nand_ecclayout;
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ret = nand_scan_tail(&info->mtd);
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if (ret) {
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return -ENXIO;
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goto err_set_drvdata;
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}
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mtd_device_register(&info->mtd, rb4xx_nand_partitions,
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ARRAY_SIZE(rb4xx_nand_partitions));
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if (ret)
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goto err_release_nand;
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return 0;
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err_release_nand:
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nand_release(&info->mtd);
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err_set_drvdata:
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platform_set_drvdata(pdev, NULL);
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err_free_info:
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kfree(info);
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err_free_gpio_nce:
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gpio_free(RB4XX_NAND_GPIO_NCE);
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err_free_gpio_cle:
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gpio_free(RB4XX_NAND_GPIO_CLE);
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err_free_gpio_ale:
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gpio_free(RB4XX_NAND_GPIO_ALE);
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err_free_gpio_ready:
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gpio_free(RB4XX_NAND_GPIO_READY);
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err:
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return ret;
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}
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static int __devexit rb4xx_nand_remove(struct platform_device *pdev)
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{
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struct rb4xx_nand_info *info = platform_get_drvdata(pdev);
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nand_release(&info->mtd);
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platform_set_drvdata(pdev, NULL);
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kfree(info);
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gpio_free(RB4XX_NAND_GPIO_NCE);
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gpio_free(RB4XX_NAND_GPIO_CLE);
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gpio_free(RB4XX_NAND_GPIO_ALE);
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gpio_free(RB4XX_NAND_GPIO_READY);
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return 0;
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}
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static struct platform_driver rb4xx_nand_driver = {
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.probe = rb4xx_nand_probe,
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.remove = __devexit_p(rb4xx_nand_remove),
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init rb4xx_nand_init(void)
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{
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return platform_driver_register(&rb4xx_nand_driver);
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}
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static void __exit rb4xx_nand_exit(void)
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{
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platform_driver_unregister(&rb4xx_nand_driver);
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}
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module_init(rb4xx_nand_init);
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module_exit(rb4xx_nand_exit);
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MODULE_DESCRIPTION(DRV_DESC);
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MODULE_VERSION(DRV_VERSION);
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org>");
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MODULE_LICENSE("GPL v2");
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