forked from Minki/linux
[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
parent
ed9137f103
commit
f348a2a281
@ -9,6 +9,7 @@ config PLAT_S3C24XX
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depends on ARCH_S3C2410
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default y if ARCH_S3C2410
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select NO_IOPORT
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select HAVE_GPIO_LIB
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help
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Base platform code for any Samsung S3C24XX device
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@ -16,6 +16,7 @@ obj-y += cpu.o
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obj-y += irq.o
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obj-y += devs.o
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obj-y += gpio.o
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obj-y += gpiolib.o
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obj-y += time.o
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obj-y += clock.o
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259
arch/arm/plat-s3c24xx/gpiolib.c
Normal file
259
arch/arm/plat-s3c24xx/gpiolib.c
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@ -0,0 +1,259 @@
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/* linux/arch/arm/plat-s3c24xx/gpiolib.c
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*
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* Copyright (c) 2008 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C24XX GPIOlib support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <asm/hardware.h>
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#include <asm/irq.h>
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#include <asm/arch/regs-gpio.h>
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struct s3c24xx_gpio_chip {
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struct gpio_chip chip;
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void __iomem *base;
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};
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static inline struct s3c24xx_gpio_chip *to_s3c_chip(struct gpio_chip *gpc)
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{
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return container_of(gpc, struct s3c24xx_gpio_chip, chip);
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}
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/* these routines are exported for use by other parts of the platform
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* and system support, but are not intended to be used directly by the
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* drivers themsevles.
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*/
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int s3c24xx_gpiolib_input(struct gpio_chip *chip, unsigned offset)
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{
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struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
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void __iomem *base = ourchip->base;
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unsigned long flags;
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unsigned long con;
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local_irq_save(flags);
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con = __raw_readl(base + 0x00);
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con &= ~(3 << (offset * 2));
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con |= (S3C2410_GPIO_OUTPUT & 0xf) << (offset * 2);
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__raw_writel(con, base + 0x00);
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local_irq_restore(flags);
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return 0;
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}
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int s3c24xx_gpiolib_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
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void __iomem *base = ourchip->base;
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unsigned long flags;
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unsigned long dat;
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unsigned long con;
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local_irq_save(flags);
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dat = __raw_readl(base + 0x04);
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dat &= ~(1 << offset);
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if (value)
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dat |= 1 << offset;
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__raw_writel(dat, base + 0x04);
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con = __raw_readl(base + 0x00);
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con &= ~(3 << (offset * 2));
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con |= (S3C2410_GPIO_OUTPUT & 0xf) << (offset * 2);
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__raw_writel(con, base + 0x00);
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__raw_writel(dat, base + 0x04);
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local_irq_restore(flags);
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return 0;
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}
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void s3c24xx_gpiolib_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
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void __iomem *base = ourchip->base;
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unsigned long flags;
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unsigned long dat;
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local_irq_save(flags);
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dat = __raw_readl(base + 0x04);
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dat &= ~(1 << offset);
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if (value)
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dat |= 1 << offset;
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__raw_writel(dat, base + 0x04);
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local_irq_restore(flags);
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}
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int s3c24xx_gpiolib_get(struct gpio_chip *chip, unsigned offset)
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{
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struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
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unsigned long val;
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val = __raw_readl(ourchip->base + 0x04);
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val >>= offset;
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val &= 1;
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return val;
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}
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static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
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{
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return -EINVAL;
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}
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static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
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void __iomem *base = ourchip->base;
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unsigned long flags;
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unsigned long dat;
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unsigned long con;
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local_irq_save(flags);
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con = __raw_readl(base + 0x00);
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dat = __raw_readl(base + 0x04);
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dat &= ~(1 << offset);
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if (value)
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dat |= 1 << offset;
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__raw_writel(dat, base + 0x04);
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con &= ~(1 << offset);
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__raw_writel(con, base + 0x00);
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__raw_writel(dat, base + 0x04);
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local_irq_restore(flags);
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return 0;
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}
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struct s3c24xx_gpio_chip gpios[] = {
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[0] = {
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.base = S3C24XX_GPIO_BASE(S3C2410_GPA0),
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.chip = {
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.base = S3C2410_GPA0,
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.owner = THIS_MODULE,
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.label = "GPIOA",
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.ngpio = 24,
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.direction_input = s3c24xx_gpiolib_banka_input,
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.direction_output = s3c24xx_gpiolib_banka_output,
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.set = s3c24xx_gpiolib_set,
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.get = s3c24xx_gpiolib_get,
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},
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},
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[1] = {
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.base = S3C24XX_GPIO_BASE(S3C2410_GPB0),
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.chip = {
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.base = S3C2410_GPB0,
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.owner = THIS_MODULE,
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.label = "GPIOB",
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.ngpio = 16,
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.direction_input = s3c24xx_gpiolib_input,
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.direction_output = s3c24xx_gpiolib_output,
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.set = s3c24xx_gpiolib_set,
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.get = s3c24xx_gpiolib_get,
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},
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},
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[2] = {
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.base = S3C24XX_GPIO_BASE(S3C2410_GPC0),
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.chip = {
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.base = S3C2410_GPC0,
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.owner = THIS_MODULE,
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.label = "GPIOC",
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.ngpio = 16,
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.direction_input = s3c24xx_gpiolib_input,
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.direction_output = s3c24xx_gpiolib_output,
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.set = s3c24xx_gpiolib_set,
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.get = s3c24xx_gpiolib_get,
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},
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},
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[3] = {
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.base = S3C24XX_GPIO_BASE(S3C2410_GPD0),
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.chip = {
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.base = S3C2410_GPD0,
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.owner = THIS_MODULE,
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.label = "GPIOD",
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.ngpio = 16,
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.direction_input = s3c24xx_gpiolib_input,
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.direction_output = s3c24xx_gpiolib_output,
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.set = s3c24xx_gpiolib_set,
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.get = s3c24xx_gpiolib_get,
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},
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},
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[4] = {
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.base = S3C24XX_GPIO_BASE(S3C2410_GPE0),
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.chip = {
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.base = S3C2410_GPE0,
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.label = "GPIOE",
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.owner = THIS_MODULE,
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.ngpio = 16,
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.direction_input = s3c24xx_gpiolib_input,
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.direction_output = s3c24xx_gpiolib_output,
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.set = s3c24xx_gpiolib_set,
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.get = s3c24xx_gpiolib_get,
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},
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},
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[5] = {
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.base = S3C24XX_GPIO_BASE(S3C2410_GPF0),
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.chip = {
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.base = S3C2410_GPF0,
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.owner = THIS_MODULE,
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.label = "GPIOF",
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.ngpio = 8,
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.direction_input = s3c24xx_gpiolib_input,
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.direction_output = s3c24xx_gpiolib_output,
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.set = s3c24xx_gpiolib_set,
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.get = s3c24xx_gpiolib_get,
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},
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},
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[6] = {
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.base = S3C24XX_GPIO_BASE(S3C2410_GPG0),
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.chip = {
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.base = S3C2410_GPG0,
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.owner = THIS_MODULE,
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.label = "GPIOG",
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.ngpio = 10,
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.direction_input = s3c24xx_gpiolib_input,
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.direction_output = s3c24xx_gpiolib_output,
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.set = s3c24xx_gpiolib_set,
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.get = s3c24xx_gpiolib_get,
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},
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},
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};
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static __init int s3c24xx_gpiolib_init(void)
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{
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struct s3c24xx_gpio_chip *chip = gpios;
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int gpn;
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for (gpn = 0; gpn < ARRAY_SIZE(gpios); gpn++, chip++)
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gpiochip_add(&chip->chip);
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return 0;
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}
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arch_initcall(s3c24xx_gpiolib_init);
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@ -1,68 +1,18 @@
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/*
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* linux/include/asm-arm/arch-s3c2410/gpio.h
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/* linux/include/asm-arm/arch-s3c2410/gpio.h
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*
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* S3C2410 GPIO wrappers for arch-neutral GPIO calls
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* Copyright (c) 2008 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* Written by Philipp Zabel <philipp.zabel@gmail.com>
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* S3C2410 - GPIO lib support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARCH_S3C2410_GPIO_H
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#define __ASM_ARCH_S3C2410_GPIO_H
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#define gpio_get_value __gpio_get_value
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#define gpio_set_value __gpio_set_value
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#define gpio_cansleep __gpio_cansleep
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#include <asm/irq.h>
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#include <asm/hardware.h>
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#include <asm/arch/regs-gpio.h>
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static inline int gpio_request(unsigned gpio, const char *label)
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{
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return 0;
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}
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static inline void gpio_free(unsigned gpio)
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{
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return;
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}
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static inline int gpio_direction_input(unsigned gpio)
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{
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s3c2410_gpio_cfgpin(gpio, S3C2410_GPIO_INPUT);
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return 0;
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}
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static inline int gpio_direction_output(unsigned gpio, int value)
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{
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s3c2410_gpio_cfgpin(gpio, S3C2410_GPIO_OUTPUT);
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/* REVISIT can we write the value first, to avoid glitching? */
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s3c2410_gpio_setpin(gpio, value);
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return 0;
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}
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#define gpio_get_value(gpio) s3c2410_gpio_getpin(gpio)
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#define gpio_set_value(gpio,value) s3c2410_gpio_setpin(gpio, value)
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#include <asm-generic/gpio.h> /* cansleep wrappers */
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#ifdef CONFIG_CPU_S3C2400
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#define gpio_to_irq(gpio) s3c2400_gpio_getirq(gpio)
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#else
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#define gpio_to_irq(gpio) s3c2410_gpio_getirq(gpio)
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#endif
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/* FIXME implement irq_to_gpio() */
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#endif
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#include <asm-generic/gpio.h>
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