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[ARM] S3C: Move common GPIO code from plat-s3c24xx 

Move the common parts of the GPIO code into plat-s3c
for use with both the s3c24xx and s3c64xx systems.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks 2008-10-31 16:14:31 +00:00
parent efd3a8eb15
commit 7db6c82a37
5 changed files with 187 additions and 118 deletions
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4
arch/arm/mach-s3c6400/include/mach/gpio.h
View File

@ -86,6 +86,10 @@ enum s3c_gpio_number {
#define S3C64XX_GPP(_nr) (S3C64XX_GPIO_P_START + (_nr))
#define S3C64XX_GPQ(_nr) (S3C64XX_GPIO_Q_START + (_nr))
/* the end of the S3C64XX specific gpios */
#define S3C64XX_GPIO_END (S3C64XX_GPQ(S3C64XX_GPIO_Q_NR) + 1)
#define S3C_GPIO_END S3C64XX_GPIO_END
/* define the number of gpios we need to the one after the GPQ() range */
#define ARCH_NR_GPIOS (S3C64XX_GPQ(S3C64XX_GPIO_Q_NR) + 1)

1
arch/arm/plat-s3c/Makefile
View File

@ -15,6 +15,7 @@ obj-y += init.o
obj-y += time.o
obj-y += clock.o
obj-y += pwm-clock.o
obj-y += gpio.o
# devices

128
arch/arm/plat-s3c/gpio.c Normal file
View File

@ -0,0 +1,128 @@
/* linux/arch/arm/plat-s3c/gpio.c
*
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C series GPIO 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/init.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <plat/gpio-core.h>
/* Default routines for controlling GPIO, based on the original S3C24XX
* GPIO functions which deal with the case where each gpio bank of the
* chip is as following:
*
* base + 0x00: Control register, 2 bits per gpio
* gpio n: 2 bits starting at (2*n)
* 00 = input, 01 = output, others mean special-function
* base + 0x04: Data register, 1 bit per gpio
* bit n: data bit n
*/
static int s3c_gpiolib_input(struct gpio_chip *chip, unsigned offset)
{
struct s3c_gpio_chip *ourchip = to_s3c_gpio(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));
__raw_writel(con, base + 0x00);
local_irq_restore(flags);
return 0;
}
static int s3c_gpiolib_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct s3c_gpio_chip *ourchip = to_s3c_gpio(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 |= 1 << (offset * 2);
__raw_writel(con, base + 0x00);
__raw_writel(dat, base + 0x04);
local_irq_restore(flags);
return 0;
}
static void s3c_gpiolib_set(struct gpio_chip *chip,
unsigned offset, int value)
{
struct s3c_gpio_chip *ourchip = to_s3c_gpio(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);
}
static int s3c_gpiolib_get(struct gpio_chip *chip, unsigned offset)
{
struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
unsigned long val;
val = __raw_readl(ourchip->base + 0x04);
val >>= offset;
val &= 1;
return val;
}
__init void s3c_gpiolib_add(struct s3c_gpio_chip *chip)
{
struct gpio_chip *gc = &chip->chip;
BUG_ON(!chip->base);
BUG_ON(!gc->label);
BUG_ON(!gc->ngpio);
if (!gc->direction_input)
gc->direction_input = s3c_gpiolib_input;
if (!gc->direction_output)
gc->direction_output = s3c_gpiolib_output;
if (!gc->set)
gc->set = s3c_gpiolib_set;
if (!gc->get)
gc->get = s3c_gpiolib_get;
/* gpiochip_add() prints own failure message on error. */
gpiochip_add(gc);
}

49
arch/arm/plat-s3c/include/plat/gpio-core.h Normal file
View File

@ -0,0 +1,49 @@
/* linux/arch/arm/plat-s3c/include/plat/gpio-core.h
*
* Copyright 2008 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* S3C Platform - GPIO 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.
*/
/* Define the core gpiolib support functions that the s3c platforms may
* need to extend or change depending on the hardware and the s3c chip
* selected at build or found at run time.
*
* These definitions are not intended for driver inclusion, there is
* nothing here that should not live outside the platform and core
* specific code.
*/
/**
* struct s3c_gpio_chip - wrapper for specific implementation of gpio
* @chip: The chip structure to be exported via gpiolib.
* @base: The base pointer to the gpio configuration registers.
*
* This wrapper provides the necessary information for the Samsung
* specific gpios being registered with gpiolib.
*/
struct s3c_gpio_chip {
struct gpio_chip chip;
void __iomem *base;
};
static inline struct s3c_gpio_chip *to_s3c_gpio(struct gpio_chip *gpc)
{
return container_of(gpc, struct s3c_gpio_chip, chip);
}
/** s3c_gpiolib_add() - add the s3c specific version of a gpio_chip.
* @chip: The chip to register
*
* This is a wrapper to gpiochip_add() that takes our specific gpio chip
* information and makes the necessary alterations for the platform and
* notes the information for use with the configuration systems and any
* other parts of the system.
*/
extern void s3c_gpiolib_add(struct s3c_gpio_chip *chip);

123
arch/arm/plat-s3c24xx/gpiolib.c
View File

@ -19,104 +19,12 @@
#include <linux/io.h>
#include <linux/gpio.h>
#include <plat/gpio-core.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <mach/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.
*/
static 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;
}
static 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;
}
static 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);
}
static 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;
@ -125,7 +33,7 @@ static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
unsigned offset, int value)
{
struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
struct s3c_gpio_chip *ourchip = to_s3c_gpio(chip);
void __iomem *base = ourchip->base;
unsigned long flags;
unsigned long dat;
@ -151,7 +59,7 @@ static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
return 0;
}
static struct s3c24xx_gpio_chip gpios[] = {
static struct s3c_gpio_chip gpios[] = {
[0] = {
.base = S3C24XX_GPIO_BASE(S3C2410_GPA0),
.chip = {
@ -219,34 +127,13 @@ static struct s3c24xx_gpio_chip gpios[] = {
},
};
static __init void s3c24xx_gpiolib_add(struct s3c24xx_gpio_chip *chip)
{
struct gpio_chip *gc = &chip->chip;
BUG_ON(!chip->base);
BUG_ON(!gc->label);
BUG_ON(!gc->ngpio);
if (!gc->direction_input)
gc->direction_input = s3c24xx_gpiolib_input;
if (!gc->direction_output)
gc->direction_output = s3c24xx_gpiolib_output;
if (!gc->set)
gc->set = s3c24xx_gpiolib_set;
if (!gc->get)
gc->get = s3c24xx_gpiolib_get;
/* gpiochip_add() prints own failure message on error. */
gpiochip_add(gc);
}
static __init int s3c24xx_gpiolib_init(void)
{
struct s3c24xx_gpio_chip *chip = gpios;
struct s3c_gpio_chip *chip = gpios;
int gpn;
for (gpn = 0; gpn < ARRAY_SIZE(gpios); gpn++, chip++)
s3c24xx_gpiolib_add(chip);
s3c_gpiolib_add(chip);
return 0;
}