[ARM] S3C24XX: Add gpiolib support

Add support for gpilib on all S3C24XX platforms.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks 2008-07-03 11:24:25 +01:00
parent ed9137f103
commit f348a2a281
4 changed files with 273 additions and 62 deletions

View file

@ -9,6 +9,7 @@ config PLAT_S3C24XX
depends on ARCH_S3C2410
default y if ARCH_S3C2410
select NO_IOPORT
select HAVE_GPIO_LIB
help
Base platform code for any Samsung S3C24XX device

View file

@ -16,6 +16,7 @@ obj-y += cpu.o
obj-y += irq.o
obj-y += devs.o
obj-y += gpio.o
obj-y += gpiolib.o
obj-y += time.o
obj-y += clock.o

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@ -0,0 +1,259 @@
/* linux/arch/arm/plat-s3c24xx/gpiolib.c
*
* Copyright (c) 2008 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* S3C24XX GPIOlib support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/arch/regs-gpio.h>
struct s3c24xx_gpio_chip {
struct gpio_chip chip;
void __iomem *base;
};
static inline struct s3c24xx_gpio_chip *to_s3c_chip(struct gpio_chip *gpc)
{
return container_of(gpc, struct s3c24xx_gpio_chip, chip);
}
/* these routines are exported for use by other parts of the platform
* and system support, but are not intended to be used directly by the
* drivers themsevles.
*/
int s3c24xx_gpiolib_input(struct gpio_chip *chip, unsigned offset)
{
struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
void __iomem *base = ourchip->base;
unsigned long flags;
unsigned long con;
local_irq_save(flags);
con = __raw_readl(base + 0x00);
con &= ~(3 << (offset * 2));
con |= (S3C2410_GPIO_OUTPUT & 0xf) << (offset * 2);
__raw_writel(con, base + 0x00);
local_irq_restore(flags);
return 0;
}
int s3c24xx_gpiolib_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
void __iomem *base = ourchip->base;
unsigned long flags;
unsigned long dat;
unsigned long con;
local_irq_save(flags);
dat = __raw_readl(base + 0x04);
dat &= ~(1 << offset);
if (value)
dat |= 1 << offset;
__raw_writel(dat, base + 0x04);
con = __raw_readl(base + 0x00);
con &= ~(3 << (offset * 2));
con |= (S3C2410_GPIO_OUTPUT & 0xf) << (offset * 2);
__raw_writel(con, base + 0x00);
__raw_writel(dat, base + 0x04);
local_irq_restore(flags);
return 0;
}
void s3c24xx_gpiolib_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
void __iomem *base = ourchip->base;
unsigned long flags;
unsigned long dat;
local_irq_save(flags);
dat = __raw_readl(base + 0x04);
dat &= ~(1 << offset);
if (value)
dat |= 1 << offset;
__raw_writel(dat, base + 0x04);
local_irq_restore(flags);
}
int s3c24xx_gpiolib_get(struct gpio_chip *chip, unsigned offset)
{
struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
unsigned long val;
val = __raw_readl(ourchip->base + 0x04);
val >>= offset;
val &= 1;
return val;
}
static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
{
return -EINVAL;
}
static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
void __iomem *base = ourchip->base;
unsigned long flags;
unsigned long dat;
unsigned long con;
local_irq_save(flags);
con = __raw_readl(base + 0x00);
dat = __raw_readl(base + 0x04);
dat &= ~(1 << offset);
if (value)
dat |= 1 << offset;
__raw_writel(dat, base + 0x04);
con &= ~(1 << offset);
__raw_writel(con, base + 0x00);
__raw_writel(dat, base + 0x04);
local_irq_restore(flags);
return 0;
}
struct s3c24xx_gpio_chip gpios[] = {
[0] = {
.base = S3C24XX_GPIO_BASE(S3C2410_GPA0),
.chip = {
.base = S3C2410_GPA0,
.owner = THIS_MODULE,
.label = "GPIOA",
.ngpio = 24,
.direction_input = s3c24xx_gpiolib_banka_input,
.direction_output = s3c24xx_gpiolib_banka_output,
.set = s3c24xx_gpiolib_set,
.get = s3c24xx_gpiolib_get,
},
},
[1] = {
.base = S3C24XX_GPIO_BASE(S3C2410_GPB0),
.chip = {
.base = S3C2410_GPB0,
.owner = THIS_MODULE,
.label = "GPIOB",
.ngpio = 16,
.direction_input = s3c24xx_gpiolib_input,
.direction_output = s3c24xx_gpiolib_output,
.set = s3c24xx_gpiolib_set,
.get = s3c24xx_gpiolib_get,
},
},
[2] = {
.base = S3C24XX_GPIO_BASE(S3C2410_GPC0),
.chip = {
.base = S3C2410_GPC0,
.owner = THIS_MODULE,
.label = "GPIOC",
.ngpio = 16,
.direction_input = s3c24xx_gpiolib_input,
.direction_output = s3c24xx_gpiolib_output,
.set = s3c24xx_gpiolib_set,
.get = s3c24xx_gpiolib_get,
},
},
[3] = {
.base = S3C24XX_GPIO_BASE(S3C2410_GPD0),
.chip = {
.base = S3C2410_GPD0,
.owner = THIS_MODULE,
.label = "GPIOD",
.ngpio = 16,
.direction_input = s3c24xx_gpiolib_input,
.direction_output = s3c24xx_gpiolib_output,
.set = s3c24xx_gpiolib_set,
.get = s3c24xx_gpiolib_get,
},
},
[4] = {
.base = S3C24XX_GPIO_BASE(S3C2410_GPE0),
.chip = {
.base = S3C2410_GPE0,
.label = "GPIOE",
.owner = THIS_MODULE,
.ngpio = 16,
.direction_input = s3c24xx_gpiolib_input,
.direction_output = s3c24xx_gpiolib_output,
.set = s3c24xx_gpiolib_set,
.get = s3c24xx_gpiolib_get,
},
},
[5] = {
.base = S3C24XX_GPIO_BASE(S3C2410_GPF0),
.chip = {
.base = S3C2410_GPF0,
.owner = THIS_MODULE,
.label = "GPIOF",
.ngpio = 8,
.direction_input = s3c24xx_gpiolib_input,
.direction_output = s3c24xx_gpiolib_output,
.set = s3c24xx_gpiolib_set,
.get = s3c24xx_gpiolib_get,
},
},
[6] = {
.base = S3C24XX_GPIO_BASE(S3C2410_GPG0),
.chip = {
.base = S3C2410_GPG0,
.owner = THIS_MODULE,
.label = "GPIOG",
.ngpio = 10,
.direction_input = s3c24xx_gpiolib_input,
.direction_output = s3c24xx_gpiolib_output,
.set = s3c24xx_gpiolib_set,
.get = s3c24xx_gpiolib_get,
},
},
};
static __init int s3c24xx_gpiolib_init(void)
{
struct s3c24xx_gpio_chip *chip = gpios;
int gpn;
for (gpn = 0; gpn < ARRAY_SIZE(gpios); gpn++, chip++)
gpiochip_add(&chip->chip);
return 0;
}
arch_initcall(s3c24xx_gpiolib_init);

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@ -1,68 +1,18 @@
/*
* linux/include/asm-arm/arch-s3c2410/gpio.h
/* linux/include/asm-arm/arch-s3c2410/gpio.h
*
* S3C2410 GPIO wrappers for arch-neutral GPIO calls
* Copyright (c) 2008 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* Written by Philipp Zabel <philipp.zabel@gmail.com>
* S3C2410 - GPIO lib support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARCH_S3C2410_GPIO_H
#define __ASM_ARCH_S3C2410_GPIO_H
#define gpio_get_value __gpio_get_value
#define gpio_set_value __gpio_set_value
#define gpio_cansleep __gpio_cansleep
#include <asm/irq.h>
#include <asm/hardware.h>
#include <asm/arch/regs-gpio.h>
static inline int gpio_request(unsigned gpio, const char *label)
{
return 0;
}
static inline void gpio_free(unsigned gpio)
{
return;
}
static inline int gpio_direction_input(unsigned gpio)
{
s3c2410_gpio_cfgpin(gpio, S3C2410_GPIO_INPUT);
return 0;
}
static inline int gpio_direction_output(unsigned gpio, int value)
{
s3c2410_gpio_cfgpin(gpio, S3C2410_GPIO_OUTPUT);
/* REVISIT can we write the value first, to avoid glitching? */
s3c2410_gpio_setpin(gpio, value);
return 0;
}
#define gpio_get_value(gpio) s3c2410_gpio_getpin(gpio)
#define gpio_set_value(gpio,value) s3c2410_gpio_setpin(gpio, value)
#include <asm-generic/gpio.h> /* cansleep wrappers */
#ifdef CONFIG_CPU_S3C2400
#define gpio_to_irq(gpio) s3c2400_gpio_getirq(gpio)
#else
#define gpio_to_irq(gpio) s3c2410_gpio_getirq(gpio)
#endif
/* FIXME implement irq_to_gpio() */
#endif
#include <asm-generic/gpio.h>