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ar71xx: rb91x-nand: rewrite to use GPIO API

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Rewrite tha rb91x-nand driver to use GPIO API to
modify the NAND control lines.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 39700
This commit is contained in:
Gabor Juhos 2014-02-23 07:19:32 +00:00
parent 8fea668cb7
commit 3d906ac6ac
3 changed files with 175 additions and 116 deletions
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23
target/linux/ar71xx/files/arch/mips/ath79/mach-rb91x.c
View file

@ -23,6 +23,7 @@
#include <linux/routerboot.h>
#include <linux/gpio.h>
#include <linux/platform_data/gpio-latch.h>
#include <linux/platform_data/rb91x_nand.h>
#include <asm/prom.h>
#include <asm/mach-ath79/ath79.h>
@ -54,6 +55,14 @@
#define RB91X_LATCH_GPIO_BASE AR934X_GPIO_COUNT
#define RB91X_LATCH_GPIO(_x) (RB91X_LATCH_GPIO_BASE + (_x))
#define RB91X_GPIO_NAND_READ RB91X_LATCH_GPIO(3)
#define RB91X_GPIO_NAND_RDY RB91X_LATCH_GPIO(4)
#define RB91X_GPIO_NLE RB91X_LATCH_GPIO(11)
#define RB91X_GPIO_NAND_NRW RB91X_LATCH_GPIO(12)
#define RB91X_GPIO_NAND_NCE RB91X_LATCH_GPIO(13)
#define RB91X_GPIO_NAND_CLE RB91X_LATCH_GPIO(14)
#define RB91X_GPIO_NAND_ALE RB91X_LATCH_GPIO(15)
struct rb_board_info {
const char *name;
u32 flags;
@ -97,6 +106,16 @@ static struct gpio_latch_platform_data rb711gr100_gpio_latch_data __initdata = {
.le_active_low = true,
};
static struct rb91x_nand_platform_data rb711gr100_nand_data __initdata = {
.gpio_nce = RB91X_GPIO_NAND_NCE,
.gpio_ale = RB91X_GPIO_NAND_ALE,
.gpio_cle = RB91X_GPIO_NAND_CLE,
.gpio_rdy = RB91X_GPIO_NAND_RDY,
.gpio_read = RB91X_GPIO_NAND_READ,
.gpio_nrw = RB91X_GPIO_NAND_NRW,
.gpio_nle = RB91X_GPIO_NLE,
};
static void __init rb711gr100_init_partitions(const struct rb_info *info)
{
rb711gr100_spi_partitions[0].size = info->hard_cfg_offs;
@ -179,7 +198,9 @@ static void __init rb711gr100_setup(void)
rb711gr100_wlan_init();
platform_device_register_simple("rb91x-nand", -1, NULL, 0);
platform_device_register_data(NULL, "rb91x-nand", -1,
&rb711gr100_nand_data,
sizeof(rb711gr100_nand_data));
platform_device_register_data(NULL, "gpio-latch", -1,
&rb711gr100_gpio_latch_data,

252
target/linux/ar71xx/files/drivers/mtd/nand/rb91x_nand.c
View file

@ -1,7 +1,7 @@
/*
* NAND flash driver for the MikroTik RouterBOARD 91x series
*
* Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
* 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
@ -17,35 +17,38 @@
#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_NAME "rb91x-nand"
#define DRV_DESC "NAND flash driver for the RouterBOARD 91x series"
#define RB91X_NAND_NRE_ENABLE BIT(3)
#define RB91X_NAND_RDY BIT(4)
#define RB91X_LATCH_ENABLE BIT(11)
#define RB91X_NAND_NRWE BIT(12)
#define RB91X_NAND_NCE BIT(13)
#define RB91X_NAND_CLE BIT(14)
#define RB91X_NAND_ALE BIT(15)
#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_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 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)
@ -81,53 +84,9 @@ static struct mtd_partition rb91x_nand_partitions[] = {
},
};
static void rb91x_change_gpo(u32 clear, u32 set)
{
void __iomem *base = ath79_gpio_base;
static unsigned on = 0xE002800;
static unsigned off = 0x0000C008;
static unsigned oe = 0;
static DEFINE_SPINLOCK(lock);
unsigned long flags;
spin_lock_irqsave(&lock, flags);
on = (on | set) & ~clear;
off = (off | clear) & ~set;
if (!oe)
oe = __raw_readl(base + AR71XX_GPIO_REG_OE);
if (on & RB91X_LATCH_ENABLE) {
u32 t;
t = oe & __raw_readl(base + AR71XX_GPIO_REG_OE);
t &= ~(on | off);
__raw_writel(t, base + AR71XX_GPIO_REG_OE);
__raw_writel(off, base + AR71XX_GPIO_REG_CLEAR);
__raw_writel(on, base + AR71XX_GPIO_REG_SET);
} else if (clear & RB91X_LATCH_ENABLE) {
oe = __raw_readl(base + AR71XX_GPIO_REG_OE);
__raw_writel(RB91X_LATCH_ENABLE,
base + AR71XX_GPIO_REG_CLEAR);
/* flush write */
__raw_readl(base + AR71XX_GPIO_REG_CLEAR);
}
spin_unlock_irqrestore(&lock, flags);
}
static inline void rb91x_latch_enable(void)
{
rb91x_change_gpo(RB91X_LATCH_ENABLE, 0);
}
static inline void rb91x_latch_disable(void)
{
rb91x_change_gpo(0, RB91X_LATCH_ENABLE);
}
static void rb91x_nand_write(const u8 *buf, unsigned len)
static void rb91x_nand_write(struct rb91x_nand_info *rbni,
const u8 *buf,
unsigned len)
{
void __iomem *base = ath79_gpio_base;
u32 oe_reg;
@ -135,7 +94,8 @@ static void rb91x_nand_write(const u8 *buf, unsigned len)
u32 out;
unsigned i;
rb91x_latch_enable();
/* 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);
@ -162,30 +122,32 @@ static void rb91x_nand_write(const u8 *buf, unsigned len)
}
/* restore registers */
__raw_writel(oe_reg, base + AR71XX_GPIO_REG_OE);
__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);
rb91x_latch_disable();
/* disable the latch */
gpio_set_value_cansleep(rbni->gpio_nle, 1);
}
static void rb91x_nand_read(u8 *read_buf, unsigned len)
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;
/* save registers */
oe_reg = __raw_readl(base + AR71XX_GPIO_REG_OE);
/* select nRE mode */
rb91x_change_gpo(0, RB91X_NAND_NRE_ENABLE);
/* enable read mode */
gpio_set_value_cansleep(rbni->gpio_read, 1);
/* enable latch */
rb91x_latch_enable();
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 */
@ -215,109 +177,169 @@ static void rb91x_nand_read(u8 *read_buf, unsigned len)
}
/* restore registers */
__raw_writel(oe_reg, base + AR71XX_GPIO_REG_OE);
__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 */
rb91x_latch_disable();
gpio_set_value_cansleep(rbni->gpio_nle, 1);
/* deselect nRE mode */
rb91x_change_gpo(RB91X_NAND_NRE_ENABLE, 0);
/* disable read mode */
gpio_set_value_cansleep(rbni->gpio_read, 0);
}
static int rb91x_nand_dev_ready(struct mtd_info *mtd)
{
void __iomem *base = ath79_gpio_base;
struct rb91x_nand_info *rbni = mtd_to_rbinfo(mtd);
return !!(__raw_readl(base + AR71XX_GPIO_REG_IN) & RB91X_NAND_RDY);
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) {
u32 on = 0;
u32 off;
if (!(ctrl & NAND_NCE))
on |= RB91X_NAND_NCE;
if (ctrl & NAND_CLE)
on |= RB91X_NAND_CLE;
if (ctrl & NAND_ALE)
on |= RB91X_NAND_ALE;
off = on ^ (RB91X_NAND_ALE | RB91X_NAND_NCE | RB91X_NAND_CLE);
rb91x_change_gpo(off, on);
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(&t, 1);
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(&data, 1);
rb91x_nand_read(rbni, &data, 1);
return data;
}
static void rb91x_nand_read_buf(struct mtd_info *mtd, u8 *buf, int len)
{
rb91x_nand_read(buf, 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)
{
rb91x_nand_write(buf, 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 *info;
struct rb91x_nand_info *rbni;
struct rb91x_nand_platform_data *pdata;
int ret;
pr_info(DRV_DESC "\n");
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
pdata = dev_get_platdata(&pdev->dev);
if (!pdata)
return -EINVAL;
rbni = devm_kzalloc(&pdev->dev, sizeof(*rbni), GFP_KERNEL);
if (!rbni)
return -ENOMEM;
info->chip.priv = &info;
info->mtd.priv = &info->chip;
info->mtd.owner = THIS_MODULE;
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;
info->chip.cmd_ctrl = rb91x_nand_cmd_ctrl;
info->chip.dev_ready = rb91x_nand_dev_ready;
info->chip.read_byte = rb91x_nand_read_byte;
info->chip.write_buf = rb91x_nand_write_buf;
info->chip.read_buf = rb91x_nand_read_buf;
rbni->chip.priv = &rbni;
rbni->mtd.priv = &rbni->chip;
rbni->mtd.owner = THIS_MODULE;
info->chip.chip_delay = 25;
info->chip.ecc.mode = NAND_ECC_SOFT;
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;
platform_set_drvdata(pdev, info);
rbni->chip.chip_delay = 25;
rbni->chip.ecc.mode = NAND_ECC_SOFT;
ret = nand_scan_ident(&info->mtd, 1, NULL);
platform_set_drvdata(pdev, rbni);
ret = rb91x_nand_gpio_init(rbni);
if (ret)
return ret;
if (info->mtd.writesize == 512)
info->chip.ecc.layout = &rb91x_nand_ecclayout;
ret = nand_scan_tail(&info->mtd);
ret = nand_scan_ident(&rbni->mtd, 1, NULL);
if (ret)
return ret;
ret = mtd_device_register(&info->mtd, rb91x_nand_partitions,
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;
@ -325,7 +347,7 @@ static int rb91x_nand_probe(struct platform_device *pdev)
return 0;
err_release_nand:
nand_release(&info->mtd);
nand_release(&rbni->mtd);
return ret;
}
@ -342,7 +364,7 @@ static struct platform_driver rb91x_nand_driver = {
.probe = rb91x_nand_probe,
.remove = rb91x_nand_remove,
.driver = {
.name = DRV_NAME,
.name = RB91X_NAND_DRIVER_NAME,
.owner = THIS_MODULE,
},
};

16
target/linux/ar71xx/files/include/linux/platform_data/rb91x_nand.h Normal file
View file

@ -0,0 +1,16 @@
#ifndef _RB91X_NAND_H_
#define _RB91X_NAND_H_
#define RB91X_NAND_DRIVER_NAME "rb91x-nand"
struct rb91x_nand_platform_data {
int gpio_nce; /* chip enable, active low */
int gpio_ale; /* address latch enable */
int gpio_cle; /* command latch enable */
int gpio_rdy;
int gpio_read;
int gpio_nrw; /* read/write enable, active low */
int gpio_nle; /* latch enable, active low */
};
#endif /* _RB91X_NAND_H_ */