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|
/*
* 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/kernel.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/mtd/nand.h>
#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;
struct mtd_info mtd;
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)
{
return container_of(mtd, struct rb91x_nand_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 rb91x_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 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 = "rootfs",
.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;
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;
rbni->mtd.priv = &rbni->chip;
rbni->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;
platform_set_drvdata(pdev, rbni);
ret = rb91x_nand_gpio_init(rbni);
if (ret)
return ret;
ret = nand_scan_ident(&rbni->mtd, 1, NULL);
if (ret)
return ret;
if (rbni->mtd.writesize == 512)
rbni->chip.ecc.layout = &rb91x_nand_ecclayout;
ret = nand_scan_tail(&rbni->mtd);
if (ret)
return ret;
ret = mtd_device_register(&rbni->mtd, rb91x_nand_partitions,
ARRAY_SIZE(rb91x_nand_partitions));
if (ret)
goto err_release_nand;
return 0;
err_release_nand:
nand_release(&rbni->mtd);
return ret;
}
static int rb91x_nand_remove(struct platform_device *pdev)
{
struct rb91x_nand_info *info = platform_get_drvdata(pdev);
nand_release(&info->mtd);
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");
|
