[linux.git] / drivers / gpio / gpio-ks8695.c

/*
 * arch/arm/mach-ks8695/gpio.c
 *
 * Copyright (C) 2006 Andrew Victor
 * Updated to GPIOLIB, Copyright 2008 Simtec Electronics
 *                     Daniel Silverstone <[email protected]>
 *
 * 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/gpio.h>
#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 <linux/io.h>

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

#include <mach/regs-gpio.h>
#include <mach/gpio-ks8695.h>

/*
 * Configure a GPIO line for either GPIO function, or its internal
 * function (Interrupt, Timer, etc).
 */
static void 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 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 */
	irq_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.
 */
static int ks8695_gpio_direction_input(struct gpio_chip *gc, 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;
}


/*
 * Configure the GPIO line as an output, with default state.
 */
static int ks8695_gpio_direction_output(struct gpio_chip *gc,
					unsigned int pin, 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 |= IOPD(pin);
	else
		x &= ~IOPD(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;
}


/*
 * Set the state of an output GPIO line.
 */
static void ks8695_gpio_set_value(struct gpio_chip *gc,
				  unsigned int pin, 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 |= IOPD(pin);
	else
		x &= ~IOPD(pin);
	__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);

	local_irq_restore(flags);
}


/*
 * Read the state of a GPIO line.
 */
static int ks8695_gpio_get_value(struct gpio_chip *gc, unsigned int pin)
{
	unsigned long x;

	if (pin > KS8695_GPIO_15)
		return -EINVAL;

	x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
	return (x & IOPD(pin)) != 0;
}


/*
 * Map GPIO line to IRQ number.
 */
static int ks8695_gpio_to_irq(struct gpio_chip *gc, unsigned int pin)
{
	if (pin > KS8695_GPIO_3)	/* only GPIO 0..3 can generate IRQ */
		return -EINVAL;

	return gpio_irq[pin];
}

/* GPIOLIB interface */

static struct gpio_chip ks8695_gpio_chip = {
	.label			= "KS8695",
	.direction_input	= ks8695_gpio_direction_input,
	.direction_output	= ks8695_gpio_direction_output,
	.get			= ks8695_gpio_get_value,
	.set			= ks8695_gpio_set_value,
	.to_irq			= ks8695_gpio_to_irq,
	.base			= 0,
	.ngpio			= 16,
	.can_sleep		= false,
};

/* Register the GPIOs */
void ks8695_register_gpios(void)
{
	if (gpiochip_add_data(&ks8695_gpio_chip, NULL))
		printk(KERN_ERR "Unable to register core GPIOs\n");
}

/* .... 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
Commit	Line	Data
8a87a996 AV	1	/*
	2	* arch/arm/mach-ks8695/gpio.c
	3	*
	4	* Copyright (C) 2006 Andrew Victor
72880ad8 DS	5	* Updated to GPIOLIB, Copyright 2008 Simtec Electronics
72880ad8 DS	6	* Daniel Silverstone <[email protected]>
8a87a996 AV	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
2f8163ba	21	#include <linux/gpio.h>
8a87a996 AV	22	#include <linux/kernel.h>
	23	#include <linux/mm.h>
	24	#include <linux/init.h>
20118ff9 AV	25	#include <linux/debugfs.h>
20118ff9 AV	26	#include <linux/seq_file.h>
8a87a996	27	#include <linux/module.h>
fced80c7	28	#include <linux/io.h>
8a87a996	29
a09e64fb	30	#include <mach/hardware.h>
8a87a996 AV	31	#include <asm/mach/irq.h>
8a87a996 AV	32
a09e64fb	33	#include <mach/regs-gpio.h>
e24e4498	34	#include <mach/gpio-ks8695.h>
8a87a996 AV	35
	36	/*
	37	* Configure a GPIO line for either GPIO function, or its internal
	38	* function (Interrupt, Timer, etc).
	39	*/
72880ad8	40	static void ks8695_gpio_mode(unsigned int pin, short gpio)
8a87a996 AV	41	{
	42	unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
	43	unsigned long x, flags;
	44
	45	if (pin > KS8695_GPIO_5) /* only GPIO 0..5 have internal functions */
	46	return;
	47
	48	local_irq_save(flags);
	49
	50	x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
	51	if (gpio) /* GPIO: set bit to 0 */
	52	x &= ~enable[pin];
	53	else /* Internal function: set bit to 1 */
	54	x \|= enable[pin];
	55	__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPC);
	56
	57	local_irq_restore(flags);
	58	}
	59
	60
	61	static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8695_IRQ_EXTERN2, KS8695_IRQ_EXTERN3 };
	62
	63	/*
	64	* Configure GPIO pin as external interrupt source.
	65	*/
72880ad8	66	int ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
8a87a996 AV	67	{
	68	unsigned long x, flags;
	69
	70	if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
	71	return -EINVAL;
	72
	73	local_irq_save(flags);
	74
	75	/* set pin as input */
	76	x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
8d163b3f	77	x &= ~IOPM(pin);
8a87a996 AV	78	__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
	79
	80	local_irq_restore(flags);
	81
	82	/* Set IRQ triggering type */
6845664a	83	irq_set_irq_type(gpio_irq[pin], type);
8a87a996 AV	84
	85	/* enable interrupt mode */
	86	ks8695_gpio_mode(pin, 0);
	87
	88	return 0;
	89	}
	90	EXPORT_SYMBOL(ks8695_gpio_interrupt);
	91
	92
	93
	94	/* .... Generic GPIO interface .............................................. */
	95
	96	/*
	97	* Configure the GPIO line as an input.
	98	*/
72880ad8	99	static int ks8695_gpio_direction_input(struct gpio_chip *gc, unsigned int pin)
8a87a996 AV	100	{
	101	unsigned long x, flags;
	102
	103	if (pin > KS8695_GPIO_15)
	104	return -EINVAL;
	105
	106	/* set pin to GPIO mode */
	107	ks8695_gpio_mode(pin, 1);
	108
	109	local_irq_save(flags);
	110
	111	/* set pin as input */
	112	x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
8d163b3f	113	x &= ~IOPM(pin);
8a87a996 AV	114	__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
	115
	116	local_irq_restore(flags);
	117
	118	return 0;
	119	}
8a87a996 AV	120
	121
	122	/*
	123	* Configure the GPIO line as an output, with default state.
	124	*/
72880ad8 DS	125	static int ks8695_gpio_direction_output(struct gpio_chip *gc,
72880ad8 DS	126	unsigned int pin, int state)
8a87a996 AV	127	{
	128	unsigned long x, flags;
	129
	130	if (pin > KS8695_GPIO_15)
	131	return -EINVAL;
	132
	133	/* set pin to GPIO mode */
	134	ks8695_gpio_mode(pin, 1);
	135
	136	local_irq_save(flags);
	137
	138	/* set line state */
	139	x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
	140	if (state)
8d163b3f	141	x \|= IOPD(pin);
8a87a996	142	else
8d163b3f	143	x &= ~IOPD(pin);
8a87a996 AV	144	__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
	145
	146	/* set pin as output */
	147	x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
8d163b3f	148	x \|= IOPM(pin);
8a87a996 AV	149	__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
	150
	151	local_irq_restore(flags);
	152
	153	return 0;
	154	}
8a87a996 AV	155
	156
	157	/*
	158	* Set the state of an output GPIO line.
	159	*/
72880ad8 DS	160	static void ks8695_gpio_set_value(struct gpio_chip *gc,
72880ad8 DS	161	unsigned int pin, int state)
8a87a996 AV	162	{
	163	unsigned long x, flags;
	164
	165	if (pin > KS8695_GPIO_15)
	166	return;
	167
	168	local_irq_save(flags);
	169
	170	/* set output line state */
	171	x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
	172	if (state)
8d163b3f	173	x \|= IOPD(pin);
8a87a996	174	else
8d163b3f	175	x &= ~IOPD(pin);
8a87a996 AV	176	__raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
	177
	178	local_irq_restore(flags);
	179	}
8a87a996 AV	180
	181
	182	/*
	183	* Read the state of a GPIO line.
	184	*/
72880ad8	185	static int ks8695_gpio_get_value(struct gpio_chip *gc, unsigned int pin)
8a87a996 AV	186	{
	187	unsigned long x;
	188
	189	if (pin > KS8695_GPIO_15)
	190	return -EINVAL;
	191
	192	x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
8d163b3f	193	return (x & IOPD(pin)) != 0;
8a87a996	194	}
8a87a996 AV	195
	196
	197	/*
	198	* Map GPIO line to IRQ number.
	199	*/
7ef71320	200	static int ks8695_gpio_to_irq(struct gpio_chip *gc, unsigned int pin)
8a87a996 AV	201	{
	202	if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
	203	return -EINVAL;
	204
	205	return gpio_irq[pin];
	206	}
8a87a996	207
72880ad8 DS	208	/* GPIOLIB interface */
	209
	210	static struct gpio_chip ks8695_gpio_chip = {
	211	.label = "KS8695",
	212	.direction_input = ks8695_gpio_direction_input,
	213	.direction_output = ks8695_gpio_direction_output,
	214	.get = ks8695_gpio_get_value,
	215	.set = ks8695_gpio_set_value,
7ef71320	216	.to_irq = ks8695_gpio_to_irq,
72880ad8 DS	217	.base = 0,
72880ad8 DS	218	.ngpio = 16,
9fb1f39e	219	.can_sleep = false,
72880ad8 DS	220	};
	221
	222	/* Register the GPIOs */
	223	void ks8695_register_gpios(void)
	224	{
4eab22e7	225	if (gpiochip_add_data(&ks8695_gpio_chip, NULL))
72880ad8 DS	226	printk(KERN_ERR "Unable to register core GPIOs\n");
72880ad8 DS	227	}
20118ff9 AV	228
	229	/* .... Debug interface ..................................................... */
	230
	231	#ifdef CONFIG_DEBUG_FS
	232
	233	static int ks8695_gpio_show(struct seq_file s, void unused)
	234	{
	235	unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
	236	unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM, IOPC_IOEINT2TM, IOPC_IOEINT3TM };
	237	unsigned long mode, ctrl, data;
	238	int i;
	239
	240	mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
	241	ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
	242	data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
	243
	244	seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");
	245
	246	for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {
	247	seq_printf(s, "%i:\t", i);
	248
8d163b3f	249	seq_printf(s, "%s\t", (mode & IOPM(i)) ? "Output" : "Input");
20118ff9 AV	250
	251	if (i <= KS8695_GPIO_3) {
	252	if (ctrl & enable[i]) {
	253	seq_printf(s, "EXT%i ", i);
	254
	255	switch ((ctrl & intmask[i]) >> (4 * i)) {
0397375d VB	256	case IOPC_TM_LOW:
	257	seq_printf(s, "(Low)"); break;
	258	case IOPC_TM_HIGH:
	259	seq_printf(s, "(High)"); break;
	260	case IOPC_TM_RISING:
	261	seq_printf(s, "(Rising)"); break;
	262	case IOPC_TM_FALLING:
	263	seq_printf(s, "(Falling)"); break;
	264	case IOPC_TM_EDGE:
	265	seq_printf(s, "(Edges)"); break;
20118ff9	266	}
36905a33	267	} else
20118ff9	268	seq_printf(s, "GPIO\t");
36905a33	269	} else if (i <= KS8695_GPIO_5) {
20118ff9 AV	270	if (ctrl & enable[i])
	271	seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);
	272	else
	273	seq_printf(s, "GPIO\t");
36905a33	274	} else {
20118ff9	275	seq_printf(s, "GPIO\t");
36905a33	276	}
20118ff9 AV	277
	278	seq_printf(s, "\t");
	279
8d163b3f	280	seq_printf(s, "%i\n", (data & IOPD(i)) ? 1 : 0);
20118ff9 AV	281	}
	282	return 0;
	283	}
	284
	285	static int ks8695_gpio_open(struct inode inode, struct file file)
	286	{
	287	return single_open(file, ks8695_gpio_show, NULL);
	288	}
	289
	290	static const struct file_operations ks8695_gpio_operations = {
	291	.open = ks8695_gpio_open,
	292	.read = seq_read,
	293	.llseek = seq_lseek,
	294	.release = single_release,
	295	};
	296
	297	static int __init ks8695_gpio_debugfs_init(void)
	298	{
	299	/* /sys/kernel/debug/ks8695_gpio */
	300	(void) debugfs_create_file("ks8695_gpio", S_IFREG \| S_IRUGO, NULL, NULL, &ks8695_gpio_operations);
	301	return 0;
	302	}
	303	postcore_initcall(ks8695_gpio_debugfs_init);
	304
	305	#endif