[deliverable/linux.git] / arch / arm / mach-pxa / mfp-pxa2xx.c

/*
 *  linux/arch/arm/mach-pxa/mfp-pxa2xx.c
 *
 *  PXA2xx pin mux configuration support
 *
 *  The GPIOs on PXA2xx can be configured as one of many alternate
 *  functions, this is by concept samilar to the MFP configuration
 *  on PXA3xx,  what's more important, the low power pin state and
 *  wakeup detection are also supported by the same framework.
 *
 *  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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sysdev.h>

#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/pxa2xx-regs.h>
#include <asm/arch/mfp-pxa2xx.h>

#include "generic.h"

#define PGSR(x)		__REG2(0x40F00020, ((x) & 0x60) >> 3)

#define PWER_WE35	(1 << 24)

struct gpio_desc {
	unsigned	valid		: 1;
	unsigned	can_wakeup	: 1;
	unsigned	keypad_gpio	: 1;
	unsigned int	mask; /* bit mask in PWER or PKWR */
	unsigned long	config;
};

static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];

static int __mfp_config_gpio(unsigned gpio, unsigned long c)
{
	unsigned long gafr, mask = GPIO_bit(gpio);
	int fn;

	fn = MFP_AF(c);
	if (fn > 3)
		return -EINVAL;

	/* alternate function and direction */
	gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2));
	GAFR(gpio) = gafr |  (fn  << ((gpio & 0xf) * 2));

	if (c & MFP_DIR_OUT)
		GPDR(gpio) |= mask;
	else
		GPDR(gpio) &= ~mask;

	/* low power state */
	switch (c & MFP_LPM_STATE_MASK) {
	case MFP_LPM_DRIVE_HIGH:
		PGSR(gpio) |= mask;
		break;
	case MFP_LPM_DRIVE_LOW:
		PGSR(gpio) &= ~mask;
		break;
	case MFP_LPM_INPUT:
		break;
	default:
		pr_warning("%s: invalid low power state for GPIO%d\n",
				__func__, gpio);
		return -EINVAL;
	}

	/* give early warning if MFP_LPM_CAN_WAKEUP is set on the
	 * configurations of those pins not able to wakeup
	 */
	if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
		pr_warning("%s: GPIO%d unable to wakeup\n",
				__func__, gpio);
		return -EINVAL;
	}

	if ((c & MFP_LPM_CAN_WAKEUP) && (c & MFP_DIR_OUT)) {
		pr_warning("%s: output GPIO%d unable to wakeup\n",
				__func__, gpio);
		return -EINVAL;
	}

	return 0;
}

static inline int __mfp_validate(int mfp)
{
	int gpio = mfp_to_gpio(mfp);

	if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
		pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
		return -1;
	}

	return gpio;
}

void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
{
	unsigned long flags;
	unsigned long *c;
	int i, gpio;

	for (i = 0, c = mfp_cfgs; i < num; i++, c++) {

		gpio = __mfp_validate(MFP_PIN(*c));
		if (gpio < 0)
			continue;

		local_irq_save(flags);

		gpio_desc[gpio].config = *c;
		__mfp_config_gpio(gpio, *c);

		local_irq_restore(flags);
	}
}

int gpio_set_wake(unsigned int gpio, unsigned int on)
{
	struct gpio_desc *d;
	unsigned long c;

	if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
		return -EINVAL;

	d = &gpio_desc[gpio];
	c = d->config;

	if (!d->valid)
		return -EINVAL;

	if (d->keypad_gpio)
		return -EINVAL;

	if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
		if (on) {
			PWER |= d->mask;

			if (c & MFP_LPM_EDGE_RISE)
				PRER |= d->mask;
			else
				PRER &= ~d->mask;

			if (c & MFP_LPM_EDGE_FALL)
				PFER |= d->mask;
			else
				PFER &= ~d->mask;
		} else {
			PWER &= ~d->mask;
			PRER &= ~d->mask;
			PFER &= ~d->mask;
		}
	}
	return 0;
}

#ifdef CONFIG_PXA25x
static int __init pxa25x_mfp_init(void)
{
	int i;

	if (cpu_is_pxa25x()) {
		for (i = 0; i <= 84; i++)
			gpio_desc[i].valid = 1;

		for (i = 0; i <= 15; i++) {
			gpio_desc[i].can_wakeup = 1;
			gpio_desc[i].mask = GPIO_bit(i);
		}
	}

	return 0;
}
postcore_initcall(pxa25x_mfp_init);
#endif /* CONFIG_PXA25x */

#ifdef CONFIG_PXA27x
static int pxa27x_pkwr_gpio[] = {
	13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
	95, 96, 97, 98, 99, 100, 101, 102
};

int keypad_set_wake(unsigned int on)
{
	unsigned int i, gpio, mask = 0;

	if (!on) {
		PKWR = 0;
		return 0;
	}

	for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {

		gpio = pxa27x_pkwr_gpio[i];

		if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
			mask |= gpio_desc[gpio].mask;
	}

	PKWR = mask;
	return 0;
}

static int __init pxa27x_mfp_init(void)
{
	int i, gpio;

	if (cpu_is_pxa27x()) {
		for (i = 0; i <= 120; i++) {
			/* skip GPIO2, 5, 6, 7, 8, they are not
			 * valid pins allow configuration
			 */
			if (i == 2 || i == 5 || i == 6 ||
			    i == 7 || i == 8)
				continue;

			gpio_desc[i].valid = 1;
		}

		/* Keypad GPIOs */
		for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
			gpio = pxa27x_pkwr_gpio[i];
			gpio_desc[gpio].can_wakeup = 1;
			gpio_desc[gpio].keypad_gpio = 1;
			gpio_desc[gpio].mask = 1 << i;
		}

		/* Overwrite GPIO13 as a PWER wakeup source */
		for (i = 0; i <= 15; i++) {
			/* skip GPIO2, 5, 6, 7, 8 */
			if (GPIO_bit(i) & 0x1e4)
				continue;

			gpio_desc[i].can_wakeup = 1;
			gpio_desc[i].mask = GPIO_bit(i);
		}

		gpio_desc[35].can_wakeup = 1;
		gpio_desc[35].mask = PWER_WE35;
	}

	return 0;
}
postcore_initcall(pxa27x_mfp_init);
#endif /* CONFIG_PXA27x */
Commit	Line	Data
7facc2f9	1	/*
	2	* linux/arch/arm/mach-pxa/mfp-pxa2xx.c
	3	*
	4	* PXA2xx pin mux configuration support
	5	*
	6	* The GPIOs on PXA2xx can be configured as one of many alternate
	7	* functions, this is by concept samilar to the MFP configuration
	8	* on PXA3xx, what's more important, the low power pin state and
	9	* wakeup detection are also supported by the same framework.
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/kernel.h>
	18	#include <linux/init.h>
	19	#include <linux/sysdev.h>
	20
	21	#include <asm/arch/hardware.h>
	22	#include <asm/arch/pxa-regs.h>
0b0a9df6	23	#include <asm/arch/pxa2xx-regs.h>
7facc2f9	24	#include <asm/arch/mfp-pxa2xx.h>
	25
	26	#include "generic.h"
	27
	28	#define PGSR(x) __REG2(0x40F00020, ((x) & 0x60) >> 3)
	29
	30	#define PWER_WE35 (1 << 24)
	31
c0a596d6	32	struct gpio_desc {
7facc2f9	33	unsigned valid : 1;
	34	unsigned can_wakeup : 1;
	35	unsigned keypad_gpio : 1;
	36	unsigned int mask; /* bit mask in PWER or PKWR */
	37	unsigned long config;
c0a596d6	38	};
	39
	40	static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
7facc2f9	41
c0a596d6	42	static int __mfp_config_gpio(unsigned gpio, unsigned long c)
7facc2f9	43	{
	44	unsigned long gafr, mask = GPIO_bit(gpio);
	45	int fn;
	46
	47	fn = MFP_AF(c);
	48	if (fn > 3)
	49	return -EINVAL;
	50
	51	/* alternate function and direction */
	52	gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2));
	53	GAFR(gpio) = gafr \| (fn << ((gpio & 0xf) * 2));
	54
	55	if (c & MFP_DIR_OUT)
	56	GPDR(gpio) \|= mask;
	57	else
	58	GPDR(gpio) &= ~mask;
	59
	60	/* low power state */
	61	switch (c & MFP_LPM_STATE_MASK) {
	62	case MFP_LPM_DRIVE_HIGH:
	63	PGSR(gpio) \|= mask;
	64	break;
	65	case MFP_LPM_DRIVE_LOW:
	66	PGSR(gpio) &= ~mask;
	67	break;
	68	case MFP_LPM_INPUT:
	69	break;
	70	default:
	71	pr_warning("%s: invalid low power state for GPIO%d\n",
	72	__func__, gpio);
	73	return -EINVAL;
	74	}
	75
c0a596d6	76	/* give early warning if MFP_LPM_CAN_WAKEUP is set on the
	77	* configurations of those pins not able to wakeup
	78	*/
	79	if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
7facc2f9	80	pr_warning("%s: GPIO%d unable to wakeup\n",
	81	__func__, gpio);
	82	return -EINVAL;
	83	}
	84
c0a596d6	85	if ((c & MFP_LPM_CAN_WAKEUP) && (c & MFP_DIR_OUT)) {
	86	pr_warning("%s: output GPIO%d unable to wakeup\n",
	87	__func__, gpio);
	88	return -EINVAL;
7facc2f9	89	}
	90
	91	return 0;
	92	}
	93
0fedb0ca EM	94	static inline int __mfp_validate(int mfp)
	95	{
	96	int gpio = mfp_to_gpio(mfp);
	97
	98	if ((mfp > MFP_PIN_GPIO127) \|\| !gpio_desc[gpio].valid) {
	99	pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
	100	return -1;
	101	}
	102
	103	return gpio;
	104	}
	105
7facc2f9	106	void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
	107	{
	108	unsigned long flags;
	109	unsigned long *c;
	110	int i, gpio;
	111
	112	for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
	113
0fedb0ca EM	114	gpio = __mfp_validate(MFP_PIN(*c));
0fedb0ca EM	115	if (gpio < 0)
7facc2f9	116	continue;
7facc2f9	117
	118	local_irq_save(flags);
	119
	120	gpio_desc[gpio].config = *c;
	121	__mfp_config_gpio(gpio, *c);
	122
	123	local_irq_restore(flags);
	124	}
	125	}
	126
c0a596d6	127	int gpio_set_wake(unsigned int gpio, unsigned int on)
	128	{
	129	struct gpio_desc *d;
	130	unsigned long c;
	131
	132	if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
	133	return -EINVAL;
	134
	135	d = &gpio_desc[gpio];
	136	c = d->config;
	137
	138	if (!d->valid)
	139	return -EINVAL;
	140
	141	if (d->keypad_gpio)
	142	return -EINVAL;
	143
	144	if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
	145	if (on) {
	146	PWER \|= d->mask;
	147
	148	if (c & MFP_LPM_EDGE_RISE)
	149	PRER \|= d->mask;
	150	else
	151	PRER &= ~d->mask;
	152
	153	if (c & MFP_LPM_EDGE_FALL)
	154	PFER \|= d->mask;
	155	else
	156	PFER &= ~d->mask;
	157	} else {
	158	PWER &= ~d->mask;
	159	PRER &= ~d->mask;
	160	PFER &= ~d->mask;
	161	}
	162	}
	163	return 0;
	164	}
	165
7facc2f9	166	#ifdef CONFIG_PXA25x
	167	static int __init pxa25x_mfp_init(void)
	168	{
	169	int i;
	170
	171	if (cpu_is_pxa25x()) {
	172	for (i = 0; i <= 84; i++)
	173	gpio_desc[i].valid = 1;
	174
	175	for (i = 0; i <= 15; i++) {
	176	gpio_desc[i].can_wakeup = 1;
	177	gpio_desc[i].mask = GPIO_bit(i);
	178	}
	179	}
	180
	181	return 0;
	182	}
	183	postcore_initcall(pxa25x_mfp_init);
	184	#endif /* CONFIG_PXA25x */
	185
	186	#ifdef CONFIG_PXA27x
c0a596d6	187	static int pxa27x_pkwr_gpio[] = {
7facc2f9	188	13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
	189	95, 96, 97, 98, 99, 100, 101, 102
	190	};
	191
c0a596d6	192	int keypad_set_wake(unsigned int on)
	193	{
	194	unsigned int i, gpio, mask = 0;
	195
	196	if (!on) {
	197	PKWR = 0;
	198	return 0;
	199	}
	200
	201	for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
	202
	203	gpio = pxa27x_pkwr_gpio[i];
	204
	205	if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
	206	mask \|= gpio_desc[gpio].mask;
	207	}
	208
	209	PKWR = mask;
	210	return 0;
	211	}
	212
7facc2f9	213	static int __init pxa27x_mfp_init(void)
	214	{
	215	int i, gpio;
	216
	217	if (cpu_is_pxa27x()) {
	218	for (i = 0; i <= 120; i++) {
	219	/* skip GPIO2, 5, 6, 7, 8, they are not
	220	* valid pins allow configuration
	221	*/
	222	if (i == 2 \|\| i == 5 \|\| i == 6 \|\|
	223	i == 7 \|\| i == 8)
	224	continue;
	225
	226	gpio_desc[i].valid = 1;
	227	}
	228
	229	/* Keypad GPIOs */
	230	for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
	231	gpio = pxa27x_pkwr_gpio[i];
	232	gpio_desc[gpio].can_wakeup = 1;
	233	gpio_desc[gpio].keypad_gpio = 1;
	234	gpio_desc[gpio].mask = 1 << i;
	235	}
	236
	237	/* Overwrite GPIO13 as a PWER wakeup source */
	238	for (i = 0; i <= 15; i++) {
	239	/* skip GPIO2, 5, 6, 7, 8 */
	240	if (GPIO_bit(i) & 0x1e4)
	241	continue;
	242
	243	gpio_desc[i].can_wakeup = 1;
	244	gpio_desc[i].mask = GPIO_bit(i);
	245	}
	246
	247	gpio_desc[35].can_wakeup = 1;
	248	gpio_desc[35].mask = PWER_WE35;
	249	}
	250
	251	return 0;
	252	}
	253	postcore_initcall(pxa27x_mfp_init);
	254	#endif /* CONFIG_PXA27x */