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linux/arch/arm/plat-samsung/gpio-config.c
Yauhen Kharuzhy 0536d0d087 ARM: S3C2443: Implement GPIO pull-up/down configuration methods 
S3C2443 has two-bits pull-up/pull-down configuration fields in GPIO
registers, but values are differ from other SoCs with two-bits
configuration. gpio-cfg-helpers.h already has prototypes for
s3c2443-style pull-up/down methods, so implement them.

Signed-off-by: Yauhen Kharuzhy <yauhen.kharuzhy@promwad.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2011-01-06 14:09:19 +09:00

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8.5 KiB
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/* linux/arch/arm/plat-s3c/gpio-config.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008-2010 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C series GPIO configuration core
*
* 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/gpio.h>
#include <linux/io.h>
#include <plat/gpio-core.h>
#include <plat/gpio-cfg.h>
#include <plat/gpio-cfg-helpers.h>
int s3c_gpio_cfgpin(unsigned int pin, unsigned int config)
{
struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
unsigned long flags;
int offset;
int ret;
if (!chip)
return -EINVAL;
offset = pin - chip->chip.base;
s3c_gpio_lock(chip, flags);
ret = s3c_gpio_do_setcfg(chip, offset, config);
s3c_gpio_unlock(chip, flags);
return ret;
}
EXPORT_SYMBOL(s3c_gpio_cfgpin);
int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr,
unsigned int cfg)
{
int ret;
for (; nr > 0; nr--, start++) {
ret = s3c_gpio_cfgpin(start, cfg);
if (ret != 0)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(s3c_gpio_cfgpin_range);
int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr,
unsigned int cfg, s3c_gpio_pull_t pull)
{
int ret;
for (; nr > 0; nr--, start++) {
s3c_gpio_setpull(start, pull);
ret = s3c_gpio_cfgpin(start, cfg);
if (ret != 0)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(s3c_gpio_cfgall_range);
unsigned s3c_gpio_getcfg(unsigned int pin)
{
struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
unsigned long flags;
unsigned ret = 0;
int offset;
if (chip) {
offset = pin - chip->chip.base;
s3c_gpio_lock(chip, flags);
ret = s3c_gpio_do_getcfg(chip, offset);
s3c_gpio_unlock(chip, flags);
}
return ret;
}
EXPORT_SYMBOL(s3c_gpio_getcfg);
int s3c_gpio_setpull(unsigned int pin, s3c_gpio_pull_t pull)
{
struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
unsigned long flags;
int offset, ret;
if (!chip)
return -EINVAL;
offset = pin - chip->chip.base;
s3c_gpio_lock(chip, flags);
ret = s3c_gpio_do_setpull(chip, offset, pull);
s3c_gpio_unlock(chip, flags);
return ret;
}
EXPORT_SYMBOL(s3c_gpio_setpull);
s3c_gpio_pull_t s3c_gpio_getpull(unsigned int pin)
{
struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
unsigned long flags;
int offset;
u32 pup = 0;
if (chip) {
offset = pin - chip->chip.base;
s3c_gpio_lock(chip, flags);
pup = s3c_gpio_do_getpull(chip, offset);
s3c_gpio_unlock(chip, flags);
}
return (__force s3c_gpio_pull_t)pup;
}
EXPORT_SYMBOL(s3c_gpio_getpull);
#ifdef CONFIG_S3C_GPIO_CFG_S3C24XX
int s3c_gpio_setcfg_s3c24xx_a(struct s3c_gpio_chip *chip,
unsigned int off, unsigned int cfg)
{
void __iomem *reg = chip->base;
unsigned int shift = off;
u32 con;
if (s3c_gpio_is_cfg_special(cfg)) {
cfg &= 0xf;
/* Map output to 0, and SFN2 to 1 */
cfg -= 1;
if (cfg > 1)
return -EINVAL;
cfg <<= shift;
}
con = __raw_readl(reg);
con &= ~(0x1 << shift);
con |= cfg;
__raw_writel(con, reg);
return 0;
}
unsigned s3c_gpio_getcfg_s3c24xx_a(struct s3c_gpio_chip *chip,
unsigned int off)
{
u32 con;
con = __raw_readl(chip->base);
con >>= off;
con &= 1;
con++;
return S3C_GPIO_SFN(con);
}
int s3c_gpio_setcfg_s3c24xx(struct s3c_gpio_chip *chip,
unsigned int off, unsigned int cfg)
{
void __iomem *reg = chip->base;
unsigned int shift = off * 2;
u32 con;
if (s3c_gpio_is_cfg_special(cfg)) {
cfg &= 0xf;
if (cfg > 3)
return -EINVAL;
cfg <<= shift;
}
con = __raw_readl(reg);
con &= ~(0x3 << shift);
con |= cfg;
__raw_writel(con, reg);
return 0;
}
unsigned int s3c_gpio_getcfg_s3c24xx(struct s3c_gpio_chip *chip,
unsigned int off)
{
u32 con;
con = __raw_readl(chip->base);
con >>= off * 2;
con &= 3;
/* this conversion works for IN and OUT as well as special mode */
return S3C_GPIO_SPECIAL(con);
}
#endif
#ifdef CONFIG_S3C_GPIO_CFG_S3C64XX
int s3c_gpio_setcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
unsigned int off, unsigned int cfg)
{
void __iomem *reg = chip->base;
unsigned int shift = (off & 7) * 4;
u32 con;
if (off < 8 && chip->chip.ngpio > 8)
reg -= 4;
if (s3c_gpio_is_cfg_special(cfg)) {
cfg &= 0xf;
cfg <<= shift;
}
con = __raw_readl(reg);
con &= ~(0xf << shift);
con |= cfg;
__raw_writel(con, reg);
return 0;
}
unsigned s3c_gpio_getcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
unsigned int off)
{
void __iomem *reg = chip->base;
unsigned int shift = (off & 7) * 4;
u32 con;
if (off < 8 && chip->chip.ngpio > 8)
reg -= 4;
con = __raw_readl(reg);
con >>= shift;
con &= 0xf;
/* this conversion works for IN and OUT as well as special mode */
return S3C_GPIO_SPECIAL(con);
}
#endif /* CONFIG_S3C_GPIO_CFG_S3C64XX */
#ifdef CONFIG_S3C_GPIO_PULL_UPDOWN
int s3c_gpio_setpull_updown(struct s3c_gpio_chip *chip,
unsigned int off, s3c_gpio_pull_t pull)
{
void __iomem *reg = chip->base + 0x08;
int shift = off * 2;
u32 pup;
pup = __raw_readl(reg);
pup &= ~(3 << shift);
pup |= pull << shift;
__raw_writel(pup, reg);
return 0;
}
s3c_gpio_pull_t s3c_gpio_getpull_updown(struct s3c_gpio_chip *chip,
unsigned int off)
{
void __iomem *reg = chip->base + 0x08;
int shift = off * 2;
u32 pup = __raw_readl(reg);
pup >>= shift;
pup &= 0x3;
return (__force s3c_gpio_pull_t)pup;
}
#ifdef CONFIG_S3C_GPIO_PULL_S3C2443
int s3c_gpio_setpull_s3c2443(struct s3c_gpio_chip *chip,
unsigned int off, s3c_gpio_pull_t pull)
{
switch (pull) {
case S3C_GPIO_PULL_NONE:
pull = 0x01;
break;
case S3C_GPIO_PULL_UP:
pull = 0x00;
break;
case S3C_GPIO_PULL_DOWN:
pull = 0x02;
break;
}
return s3c_gpio_setpull_updown(chip, off, pull);
}
s3c_gpio_pull_t s3c_gpio_getpull_s3c2443(struct s3c_gpio_chip *chip,
unsigned int off)
{
s3c_gpio_pull_t pull;
pull = s3c_gpio_getpull_updown(chip, off);
switch (pull) {
case 0x00:
pull = S3C_GPIO_PULL_UP;
break;
case 0x01:
case 0x03:
pull = S3C_GPIO_PULL_NONE;
break;
case 0x02:
pull = S3C_GPIO_PULL_DOWN;
break;
}
return pull;
}
#endif
#endif
#if defined(CONFIG_S3C_GPIO_PULL_UP) || defined(CONFIG_S3C_GPIO_PULL_DOWN)
static int s3c_gpio_setpull_1(struct s3c_gpio_chip *chip,
unsigned int off, s3c_gpio_pull_t pull,
s3c_gpio_pull_t updown)
{
void __iomem *reg = chip->base + 0x08;
u32 pup = __raw_readl(reg);
if (pull == updown)
pup &= ~(1 << off);
else if (pull == S3C_GPIO_PULL_NONE)
pup |= (1 << off);
else
return -EINVAL;
__raw_writel(pup, reg);
return 0;
}
static s3c_gpio_pull_t s3c_gpio_getpull_1(struct s3c_gpio_chip *chip,
unsigned int off, s3c_gpio_pull_t updown)
{
void __iomem *reg = chip->base + 0x08;
u32 pup = __raw_readl(reg);
pup &= (1 << off);
return pup ? S3C_GPIO_PULL_NONE : updown;
}
#endif /* CONFIG_S3C_GPIO_PULL_UP || CONFIG_S3C_GPIO_PULL_DOWN */
#ifdef CONFIG_S3C_GPIO_PULL_UP
s3c_gpio_pull_t s3c_gpio_getpull_1up(struct s3c_gpio_chip *chip,
unsigned int off)
{
return s3c_gpio_getpull_1(chip, off, S3C_GPIO_PULL_UP);
}
int s3c_gpio_setpull_1up(struct s3c_gpio_chip *chip,
unsigned int off, s3c_gpio_pull_t pull)
{
return s3c_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_UP);
}
#endif /* CONFIG_S3C_GPIO_PULL_UP */
#ifdef CONFIG_S3C_GPIO_PULL_DOWN
s3c_gpio_pull_t s3c_gpio_getpull_1down(struct s3c_gpio_chip *chip,
unsigned int off)
{
return s3c_gpio_getpull_1(chip, off, S3C_GPIO_PULL_DOWN);
}
int s3c_gpio_setpull_1down(struct s3c_gpio_chip *chip,
unsigned int off, s3c_gpio_pull_t pull)
{
return s3c_gpio_setpull_1(chip, off, pull, S3C_GPIO_PULL_DOWN);
}
#endif /* CONFIG_S3C_GPIO_PULL_DOWN */
#ifdef CONFIG_S5P_GPIO_DRVSTR
s5p_gpio_drvstr_t s5p_gpio_get_drvstr(unsigned int pin)
{
struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
unsigned int off;
void __iomem *reg;
int shift;
u32 drvstr;
if (!chip)
return -EINVAL;
off = pin - chip->chip.base;
shift = off * 2;
reg = chip->base + 0x0C;
drvstr = __raw_readl(reg);
drvstr = drvstr >> shift;
drvstr &= 0x3;
return (__force s5p_gpio_drvstr_t)drvstr;
}
EXPORT_SYMBOL(s5p_gpio_get_drvstr);
int s5p_gpio_set_drvstr(unsigned int pin, s5p_gpio_drvstr_t drvstr)
{
struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin);
unsigned int off;
void __iomem *reg;
int shift;
u32 tmp;
if (!chip)
return -EINVAL;
off = pin - chip->chip.base;
shift = off * 2;
reg = chip->base + 0x0C;
tmp = __raw_readl(reg);
tmp &= ~(0x3 << shift);
tmp |= drvstr << shift;
__raw_writel(tmp, reg);
return 0;
}
EXPORT_SYMBOL(s5p_gpio_set_drvstr);
#endif /* CONFIG_S5P_GPIO_DRVSTR */
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