arch/arm/mach-ks8695/gpio.c - maze/linux - Git at Google

 /*
  * 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/debugfs.h>
 #include <linux/seq_file.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);


 /* .... Debug interface ..................................................... */

 #ifdef CONFIG_DEBUG_FS

 static int ks8695_gpio_show(struct seq_file *s, void *unused)
 {
 	unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
 	unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM, IOPC_IOEINT2TM, IOPC_IOEINT3TM };
 	unsigned long mode, ctrl, data;
 	int i;

 	mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
 	ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
 	data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);

 	seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");

 	for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {
 		seq_printf(s, "%i:\t", i);

 		seq_printf(s, "%s\t", (mode & IOPM_(i)) ? "Output" : "Input");

 		if (i <= KS8695_GPIO_3) {
 			if (ctrl & enable[i]) {
 				seq_printf(s, "EXT%i ", i);

 				switch ((ctrl & intmask[i]) >> (4 * i)) {
 					case IOPC_TM_LOW:
 						seq_printf(s, "(Low)");		break;
 					case IOPC_TM_HIGH:
 						seq_printf(s, "(High)");	break;
 					case IOPC_TM_RISING:
 						seq_printf(s, "(Rising)");	break;
 					case IOPC_TM_FALLING:
 						seq_printf(s, "(Falling)");	break;
 					case IOPC_TM_EDGE:
 						seq_printf(s, "(Edges)");	break;
 				}
 			}
 			else
 				seq_printf(s, "GPIO\t");
 		}
 		else if (i <= KS8695_GPIO_5) {
 			if (ctrl & enable[i])
 				seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);
 			else
 				seq_printf(s, "GPIO\t");
 		}
 		else
 			seq_printf(s, "GPIO\t");

 		seq_printf(s, "\t");

 		seq_printf(s, "%i\n", (data & IOPD_(i)) ? 1 : 0);
 	}
 	return 0;
 }

 static int ks8695_gpio_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, ks8695_gpio_show, NULL);
 }

 static const struct file_operations ks8695_gpio_operations = {
 	.open		= ks8695_gpio_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= single_release,
 };

 static int __init ks8695_gpio_debugfs_init(void)
 {
 	/* /sys/kernel/debug/ks8695_gpio */
 	(void) debugfs_create_file("ks8695_gpio", S_IFREG | S_IRUGO, NULL, NULL, &ks8695_gpio_operations);
 	return 0;
 }
 postcore_initcall(ks8695_gpio_debugfs_init);

 #endif
	/*
	* 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/debugfs.h>
	#include <linux/seq_file.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);


	/* .... Debug interface ..................................................... */

	#ifdef CONFIG_DEBUG_FS

	static int ks8695_gpio_show(struct seq_file s, void unused)
	{
	unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
	unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM, IOPC_IOEINT2TM, IOPC_IOEINT3TM };
	unsigned long mode, ctrl, data;
	int i;

	mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
	ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
	data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);

	seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");

	for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {
	seq_printf(s, "%i:\t", i);

	seq_printf(s, "%s\t", (mode & IOPM_(i)) ? "Output" : "Input");

	if (i <= KS8695_GPIO_3) {
	if (ctrl & enable[i]) {
	seq_printf(s, "EXT%i ", i);

	switch ((ctrl & intmask[i]) >> (4 * i)) {
	case IOPC_TM_LOW:
	seq_printf(s, "(Low)"); break;
	case IOPC_TM_HIGH:
	seq_printf(s, "(High)"); break;
	case IOPC_TM_RISING:
	seq_printf(s, "(Rising)"); break;
	case IOPC_TM_FALLING:
	seq_printf(s, "(Falling)"); break;
	case IOPC_TM_EDGE:
	seq_printf(s, "(Edges)"); break;
	}
	}
	else
	seq_printf(s, "GPIO\t");
	}
	else if (i <= KS8695_GPIO_5) {
	if (ctrl & enable[i])
	seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);
	else
	seq_printf(s, "GPIO\t");
	}
	else
	seq_printf(s, "GPIO\t");

	seq_printf(s, "\t");

	seq_printf(s, "%i\n", (data & IOPD_(i)) ? 1 : 0);
	}
	return 0;
	}

	static int ks8695_gpio_open(struct inode inode, struct file file)
	{
	return single_open(file, ks8695_gpio_show, NULL);
	}

	static const struct file_operations ks8695_gpio_operations = {
	.open = ks8695_gpio_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	static int __init ks8695_gpio_debugfs_init(void)
	{
	/* /sys/kernel/debug/ks8695_gpio */
	(void) debugfs_create_file("ks8695_gpio", S_IFREG \| S_IRUGO, NULL, NULL, &ks8695_gpio_operations);
	return 0;
	}
	postcore_initcall(ks8695_gpio_debugfs_init);

	#endif