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Commit c52d3d68 authored by wanzongshun's avatar wanzongshun Committed by Russell King
Browse files

[ARM] 5548/1: Add gpio api for w90p910 platform 



Add gpio api for w90p910 platform.

Signed-off-by: default avatarWan ZongShun <mcuos.com@gmail.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 27eb9758

arch/arm/Kconfig

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@@ -488,6 +488,8 @@ config ARCH_NS9XXX 
config ARCH_W90X900

	bool "Nuvoton W90X900 CPU"

	select CPU_ARM926T

	select ARCH_REQUIRE_GPIOLIB

	select GENERIC_GPIO

	help

		Support for Nuvoton (Winbond logic dept.) ARM9 processor,You

		can login www.mcuos.com or www.nuvoton.com to know more.

arch/arm/mach-w90x900/Makefile

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@@ -4,7 +4,7 @@ 


# Object file lists.



obj-y				:= irq.o time.o mfp-w90p910.o

obj-y				:= irq.o time.o mfp-w90p910.o gpio.o



# W90X900 CPU support files

arch/arm/mach-w90x900/gpio.c

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/*

 * linux/arch/arm/mach-w90p910/gpio.c

 *

 * Generic w90p910 GPIO handling

 *

 *  Wan ZongShun <mcuos.com@gmail.com>

 *

 * 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/clk.h>

#include <linux/errno.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/debugfs.h>

#include <linux/seq_file.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/module.h>

#include <linux/io.h>

#include <linux/gpio.h>



#include <mach/hardware.h>



#define GPIO_BASE 		(W90X900_VA_GPIO)

#define GPIO_DIR		(0x04)

#define GPIO_OUT		(0x08)

#define GPIO_IN			(0x0C)

#define GROUPINERV		(0x10)

#define GPIO_GPIO(Nb)		(0x00000001 << (Nb))

#define to_w90p910_gpio_chip(c) container_of(c, struct w90p910_gpio_chip, chip)



#define W90P910_GPIO_CHIP(name, base_gpio, nr_gpio)			\

	{								\

		.chip = {						\

			.label		  = name,			\

			.direction_input  = w90p910_dir_input,		\

			.direction_output = w90p910_dir_output,		\

			.get		  = w90p910_gpio_get,		\

			.set		  = w90p910_gpio_set,		\

			.base		  = base_gpio,			\

			.ngpio		  = nr_gpio,			\

		}							\

	}



struct w90p910_gpio_chip {

	struct gpio_chip	chip;

	void __iomem		*regbase;	/* Base of group register*/

	spinlock_t 		gpio_lock;

};



static int w90p910_gpio_get(struct gpio_chip *chip, unsigned offset)

{

	struct w90p910_gpio_chip *w90p910_gpio = to_w90p910_gpio_chip(chip);

	void __iomem *pio = w90p910_gpio->regbase + GPIO_IN;

	unsigned int regval;



	regval = __raw_readl(pio);

	regval &= GPIO_GPIO(offset);



	return (regval != 0);

}



static void w90p910_gpio_set(struct gpio_chip *chip, unsigned offset, int val)

{

	struct w90p910_gpio_chip *w90p910_gpio = to_w90p910_gpio_chip(chip);

	void __iomem *pio = w90p910_gpio->regbase + GPIO_OUT;

	unsigned int regval;

	unsigned long flags;



	spin_lock_irqsave(&w90p910_gpio->gpio_lock, flags);



	regval = __raw_readl(pio);



	if (val)

		regval |= GPIO_GPIO(offset);

	else

		regval &= ~GPIO_GPIO(offset);



	__raw_writel(regval, pio);



	spin_unlock_irqrestore(&w90p910_gpio->gpio_lock, flags);

}



static int w90p910_dir_input(struct gpio_chip *chip, unsigned offset)

{

	struct w90p910_gpio_chip *w90p910_gpio = to_w90p910_gpio_chip(chip);

	void __iomem *pio = w90p910_gpio->regbase + GPIO_DIR;

	unsigned int regval;

	unsigned long flags;



	spin_lock_irqsave(&w90p910_gpio->gpio_lock, flags);



	regval = __raw_readl(pio);

	regval &= ~GPIO_GPIO(offset);

	__raw_writel(regval, pio);



	spin_unlock_irqrestore(&w90p910_gpio->gpio_lock, flags);



	return 0;

}



static int w90p910_dir_output(struct gpio_chip *chip, unsigned offset, int val)

{

	struct w90p910_gpio_chip *w90p910_gpio = to_w90p910_gpio_chip(chip);

	void __iomem *outreg = w90p910_gpio->regbase + GPIO_OUT;

	void __iomem *pio = w90p910_gpio->regbase + GPIO_DIR;

	unsigned int regval;

	unsigned long flags;



	spin_lock_irqsave(&w90p910_gpio->gpio_lock, flags);



	regval = __raw_readl(pio);

	regval |= GPIO_GPIO(offset);

	__raw_writel(regval, pio);



	regval = __raw_readl(outreg);



	if (val)

		regval |= GPIO_GPIO(offset);

	else

		regval &= ~GPIO_GPIO(offset);



	__raw_writel(regval, outreg);



	spin_unlock_irqrestore(&w90p910_gpio->gpio_lock, flags);



	return 0;

}



static struct w90p910_gpio_chip w90p910_gpio[] = {

	W90P910_GPIO_CHIP("GROUPC", 0, 16),

	W90P910_GPIO_CHIP("GROUPD", 16, 10),

	W90P910_GPIO_CHIP("GROUPE", 26, 14),

	W90P910_GPIO_CHIP("GROUPF", 40, 10),

	W90P910_GPIO_CHIP("GROUPG", 50, 17),

	W90P910_GPIO_CHIP("GROUPH", 67, 8),

	W90P910_GPIO_CHIP("GROUPI", 75, 17),

};



void __init w90p910_init_gpio(int nr_group)

{

	unsigned	i;

	struct w90p910_gpio_chip *gpio_chip;



	for (i = 0; i < nr_group; i++) {

		gpio_chip = &w90p910_gpio[i];

		spin_lock_init(&gpio_chip->gpio_lock);

		gpio_chip->regbase = GPIO_BASE + i * GROUPINERV;

		gpiochip_add(&gpio_chip->chip);

	}

}

arch/arm/mach-w90x900/include/mach/gpio.h

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/*

 * linux/arch/arm/mach-w90p910/include/mach/gpio.h

 *

 * Generic w90p910 GPIO handling

 *

 *  Wan ZongShun <mcuos.com@gmail.com>

 *

 * 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.

 */



#ifndef __ASM_ARCH_W90P910_GPIO_H

#define __ASM_ARCH_W90P910_GPIO_H



#include <mach/hardware.h>

#include <asm/irq.h>

#include <asm-generic/gpio.h>



#define gpio_get_value	__gpio_get_value

#define gpio_set_value	__gpio_set_value

#define gpio_cansleep	__gpio_cansleep



static inline int gpio_to_irq(unsigned gpio)

{

	return gpio;

}



static inline int irq_to_gpio(unsigned irq)

{

	return irq;

}



#endif