[ARM] 4377/1: KS8695: GPIO driver (8a87a996) · Commits · e / devices / android_kernel_teracube_emerald

arch/arm/Kconfig

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	@@ -308,6 +308,7 @@ config ARCH_L7200

	config ARCH_KS8695		config ARCH_KS8695
	bool "Micrel/Kendin KS8695"		bool "Micrel/Kendin KS8695"
			select GENERIC_GPIO
	help		help
	Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based		Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
	System-on-Chip devices.		System-on-Chip devices.

arch/arm/mach-ks8695/Makefile

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	@@ -3,7 +3,7 @@
	# Makefile for KS8695 architecture support		# Makefile for KS8695 architecture support
	#		#

	obj-y := cpu.o irq.o time.o devices.o		obj-y := cpu.o irq.o time.o gpio.o devices.o
	obj-m :=		obj-m :=
	obj-n :=		obj-n :=
	obj- :=		obj- :=

arch/arm/mach-ks8695/gpio.c

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			/*
			* arch/arm/mach-ks8695/gpio.c
			*
			* Copyright (C) 2006 Andrew Victor
			*
			* 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.
			*
			* 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
			*/

			#include <linux/kernel.h>
			#include <linux/mm.h>
			#include <linux/init.h>
			#include <linux/module.h>

			#include <asm/io.h>
			#include <asm/hardware.h>
			#include <asm/mach/irq.h>

			#include <asm/arch/regs-gpio.h>
			#include <asm/arch/gpio.h>

			/*
			* Configure a GPIO line for either GPIO function, or its internal
			* function (Interrupt, Timer, etc).
			*/
			static void __init_or_module ks8695_gpio_mode(unsigned int pin, short gpio)
			{
			unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
			unsigned long x, flags;

			if (pin > KS8695_GPIO_5) /* only GPIO 0..5 have internal functions */
			return;

			local_irq_save(flags);

			x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
			if (gpio) /* GPIO: set bit to 0 */
			x &= ~enable[pin];
			else /* Internal function: set bit to 1 */
			x \|= enable[pin];
			__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPC);

			local_irq_restore(flags);
			}


			static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8695_IRQ_EXTERN2, KS8695_IRQ_EXTERN3 };

			/*
			* Configure GPIO pin as external interrupt source.
			*/
			int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
			{
			unsigned long x, flags;

			if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
			return -EINVAL;

			local_irq_save(flags);

			/* set pin as input */
			x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
			x &= ~IOPM_(pin);
			__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);

			local_irq_restore(flags);

			/* Set IRQ triggering type */
			set_irq_type(gpio_irq[pin], type);

			/* enable interrupt mode */
			ks8695_gpio_mode(pin, 0);

			return 0;
			}
			EXPORT_SYMBOL(ks8695_gpio_interrupt);



			/* .... Generic GPIO interface .............................................. */

			/*
			* Configure the GPIO line as an input.
			*/
			int __init_or_module gpio_direction_input(unsigned int pin)
			{
			unsigned long x, flags;

			if (pin > KS8695_GPIO_15)
			return -EINVAL;

			/* set pin to GPIO mode */
			ks8695_gpio_mode(pin, 1);

			local_irq_save(flags);

			/* set pin as input */
			x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
			x &= ~IOPM_(pin);
			__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);

			local_irq_restore(flags);

			return 0;
			}
			EXPORT_SYMBOL(gpio_direction_input);


			/*
			* Configure the GPIO line as an output, with default state.
			*/
			int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state)
			{
			unsigned long x, flags;

			if (pin > KS8695_GPIO_15)
			return -EINVAL;

			/* set pin to GPIO mode */
			ks8695_gpio_mode(pin, 1);

			local_irq_save(flags);

			/* set line state */
			x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
			if (state)
			x \|= (1 << pin);
			else
			x &= ~(1 << pin);
			__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);

			/* set pin as output */
			x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
			x \|= IOPM_(pin);
			__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);

			local_irq_restore(flags);

			return 0;
			}
			EXPORT_SYMBOL(gpio_direction_output);


			/*
			* Set the state of an output GPIO line.
			*/
			void gpio_set_value(unsigned int pin, unsigned int state)
			{
			unsigned long x, flags;

			if (pin > KS8695_GPIO_15)
			return;

			local_irq_save(flags);

			/* set output line state */
			x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
			if (state)
			x \|= (1 << pin);
			else
			x &= ~(1 << pin);
			__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);

			local_irq_restore(flags);
			}
			EXPORT_SYMBOL(gpio_set_value);


			/*
			* Read the state of a GPIO line.
			*/
			int gpio_get_value(unsigned int pin)
			{
			unsigned long x;

			if (pin > KS8695_GPIO_15)
			return -EINVAL;

			x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
			return (x & (1 << pin)) != 0;
			}
			EXPORT_SYMBOL(gpio_get_value);


			/*
			* Map GPIO line to IRQ number.
			*/
			int gpio_to_irq(unsigned int pin)
			{
			if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
			return -EINVAL;

			return gpio_irq[pin];
			}
			EXPORT_SYMBOL(gpio_to_irq);


			/*
			* Map IRQ number to GPIO line.
			*/
			int irq_to_gpio(unsigned int irq)
			{
			if ((irq < KS8695_IRQ_EXTERN0) \|\| (irq > KS8695_IRQ_EXTERN3))
			return -EINVAL;

			return (irq - KS8695_IRQ_EXTERN0);
			}
			EXPORT_SYMBOL(irq_to_gpio);

include/asm-arm/arch-ks8695/gpio.h

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			/*
			* include/asm-arm/arch-ks8695/gpio.h
			*
			* Copyright (C) 2006 Andrew Victor
			*
			* 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_GPIO_H_
			#define __ASM_ARCH_GPIO_H_

			#define KS8695_GPIO_0 0
			#define KS8695_GPIO_1 1
			#define KS8695_GPIO_2 2
			#define KS8695_GPIO_3 3
			#define KS8695_GPIO_4 4
			#define KS8695_GPIO_5 5
			#define KS8695_GPIO_6 6
			#define KS8695_GPIO_7 7
			#define KS8695_GPIO_8 8
			#define KS8695_GPIO_9 9
			#define KS8695_GPIO_10 10
			#define KS8695_GPIO_11 11
			#define KS8695_GPIO_12 12
			#define KS8695_GPIO_13 13
			#define KS8695_GPIO_14 14
			#define KS8695_GPIO_15 15


			/*
			* Configure GPIO pin as external interrupt source.
			*/
			int __init_or_module ks8695_gpio_interrupt(unsigned int pin, unsigned int type);

			/*
			* Configure the GPIO line as an input.
			*/
			int __init_or_module gpio_direction_input(unsigned int pin);

			/*
			* Configure the GPIO line as an output, with default state.
			*/
			int __init_or_module gpio_direction_output(unsigned int pin, unsigned int state);

			/*
			* Set the state of an output GPIO line.
			*/
			void gpio_set_value(unsigned int pin, unsigned int state);

			/*
			* Read the state of a GPIO line.
			*/
			int gpio_get_value(unsigned int pin);

			/*
			* Map GPIO line to IRQ number.
			*/
			int gpio_to_irq(unsigned int pin);

			/*
			* Map IRQ number to GPIO line.
			*/
			int irq_to_gpio(unsigned int irq);


			#include <asm-generic/gpio.h>

			static inline int gpio_request(unsigned int pin, const char *label)
			{
			return 0;
			}

			static inline void gpio_free(unsigned int pin)
			{
			}

			#endif