arch/arm/mach-pxa/mfp-pxa2xx.c - maze/linux - Git at Google

 /*
  *  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/gpio.h>
 #include <linux/gpio-pxa.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/syscore_ops.h>

 #include <mach/pxa2xx-regs.h>
 #include <mach/mfp-pxa2xx.h>

 #include "generic.h"

 #define PGSR(x)		__REG2(0x40F00020, (x) << 2)
 #define __GAFR(u, x)	__REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
 #define GAFR_L(x)	__GAFR(0, x)
 #define GAFR_U(x)	__GAFR(1, x)

 #define BANK_OFF(n)	(((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
 #define GPLR(x)		__REG2(0x40E00000, BANK_OFF((x) >> 5))
 #define GPDR(x)		__REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)

 #define PWER_WE35	(1 << 24)

 struct gpio_desc {
 	unsigned	valid		: 1;
 	unsigned	can_wakeup	: 1;
 	unsigned	keypad_gpio	: 1;
 	unsigned	dir_inverted	: 1;
 	unsigned int	mask; /* bit mask in PWER or PKWR */
 	unsigned int	mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
 	unsigned long	config;
 };

 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];

 static unsigned long gpdr_lpm[4];

 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
 {
 	unsigned long gafr, mask = GPIO_bit(gpio);
 	int bank = gpio_to_bank(gpio);
 	int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
 	int shft = (gpio & 0xf) << 1;
 	int fn = MFP_AF(c);
 	int is_out = (c & MFP_DIR_OUT) ? 1 : 0;

 	if (fn > 3)
 		return -EINVAL;

 	/* alternate function and direction at run-time */
 	gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
 	gafr = (gafr & ~(0x3 << shft)) | (fn << shft);

 	if (uorl == 0)
 		GAFR_L(bank) = gafr;
 	else
 		GAFR_U(bank) = gafr;

 	if (is_out ^ gpio_desc[gpio].dir_inverted)
 		GPDR(gpio) |= mask;
 	else
 		GPDR(gpio) &= ~mask;

 	/* alternate function and direction at low power mode */
 	switch (c & MFP_LPM_STATE_MASK) {
 	case MFP_LPM_DRIVE_HIGH:
 		PGSR(bank) |= mask;
 		is_out = 1;
 		break;
 	case MFP_LPM_DRIVE_LOW:
 		PGSR(bank) &= ~mask;
 		is_out = 1;
 		break;
 	case MFP_LPM_INPUT:
 	case MFP_LPM_DEFAULT:
 		break;
 	default:
 		/* warning and fall through, treat as MFP_LPM_DEFAULT */
 		pr_warning("%s: GPIO%d: unsupported low power mode\n",
 				__func__, gpio);
 		break;
 	}

 	if (is_out ^ gpio_desc[gpio].dir_inverted)
 		gpdr_lpm[bank] |= mask;
 	else
 		gpdr_lpm[bank] &= ~mask;

 	/* 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) && is_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);
 	}
 }

 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
 {
 	unsigned long flags, c;
 	int gpio;

 	gpio = __mfp_validate(mfp);
 	if (gpio < 0)
 		return;

 	local_irq_save(flags);

 	c = gpio_desc[gpio].config;
 	c = (c & ~MFP_LPM_STATE_MASK) | lpm;
 	__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, mux_taken;

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

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

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

 	/* Allow keypad GPIOs to wakeup system when
 	 * configured as generic GPIOs.
 	 */
 	if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
 	    (d->config & MFP_LPM_CAN_WAKEUP)) {
 		if (on)
 			PKWR |= d->mask;
 		else
 			PKWR &= ~d->mask;
 		return 0;
 	}

 	mux_taken = (PWER & d->mux_mask) & (~d->mask);
 	if (on && mux_taken)
 		return -EBUSY;

 	if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 		if (on) {
 			PWER = (PWER & ~d->mux_mask) | 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 void __init pxa25x_mfp_init(void)
 {
 	int i;

 	for (i = 0; i <= pxa_last_gpio; 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);
 	}

 	/* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
 	 * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
 	 */
 	for (i = 86; i <= pxa_last_gpio; i++)
 		gpio_desc[i].dir_inverted = 1;
 }
 #else
 static inline void pxa25x_mfp_init(void) {}
 #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;
 	struct gpio_desc *d;

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

 		gpio = pxa27x_pkwr_gpio[i];
 		d = &gpio_desc[gpio];

 		/* skip if configured as generic GPIO */
 		if (MFP_AF(d->config) == 0)
 			continue;

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

 	if (on)
 		PKWR |= mask;
 	else
 		PKWR &= ~mask;
 	return 0;
 }

 #define PWER_WEMUX2_GPIO38	(1 << 16)
 #define PWER_WEMUX2_GPIO53	(2 << 16)
 #define PWER_WEMUX2_GPIO40	(3 << 16)
 #define PWER_WEMUX2_GPIO36	(4 << 16)
 #define PWER_WEMUX2_MASK	(7 << 16)
 #define PWER_WEMUX3_GPIO31	(1 << 19)
 #define PWER_WEMUX3_GPIO113	(2 << 19)
 #define PWER_WEMUX3_MASK	(3 << 19)

 #define INIT_GPIO_DESC_MUXED(mux, gpio)				\
 do {								\
 	gpio_desc[(gpio)].can_wakeup = 1;			\
 	gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;	\
 	gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;	\
 } while (0)

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

 	for (i = 0; i <= pxa_last_gpio; 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;

 	INIT_GPIO_DESC_MUXED(WEMUX3, 31);
 	INIT_GPIO_DESC_MUXED(WEMUX3, 113);
 	INIT_GPIO_DESC_MUXED(WEMUX2, 38);
 	INIT_GPIO_DESC_MUXED(WEMUX2, 53);
 	INIT_GPIO_DESC_MUXED(WEMUX2, 40);
 	INIT_GPIO_DESC_MUXED(WEMUX2, 36);
 }
 #else
 static inline void pxa27x_mfp_init(void) {}
 #endif /* CONFIG_PXA27x */

 #ifdef CONFIG_PM
 static unsigned long saved_gafr[2][4];
 static unsigned long saved_gpdr[4];
 static unsigned long saved_pgsr[4];

 static int pxa2xx_mfp_suspend(void)
 {
 	int i;

 	/* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
 	for (i = 0; i < pxa_last_gpio; i++) {
 		if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
 		    (GPDR(i) & GPIO_bit(i))) {
 			if (GPLR(i) & GPIO_bit(i))
 				PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
 			else
 				PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
 		}
 	}

 	for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {

 		saved_gafr[0][i] = GAFR_L(i);
 		saved_gafr[1][i] = GAFR_U(i);
 		saved_gpdr[i] = GPDR(i * 32);
 		saved_pgsr[i] = PGSR(i);

 		GPDR(i * 32) = gpdr_lpm[i];
 	}
 	return 0;
 }

 static void pxa2xx_mfp_resume(void)
 {
 	int i;

 	for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 		GAFR_L(i) = saved_gafr[0][i];
 		GAFR_U(i) = saved_gafr[1][i];
 		GPDR(i * 32) = saved_gpdr[i];
 		PGSR(i) = saved_pgsr[i];
 	}
 	PSSR = PSSR_RDH | PSSR_PH;
 }
 #else
 #define pxa2xx_mfp_suspend	NULL
 #define pxa2xx_mfp_resume	NULL
 #endif

 struct syscore_ops pxa2xx_mfp_syscore_ops = {
 	.suspend	= pxa2xx_mfp_suspend,
 	.resume		= pxa2xx_mfp_resume,
 };

 static int __init pxa2xx_mfp_init(void)
 {
 	int i;

 	if (!cpu_is_pxa2xx())
 		return 0;

 	if (cpu_is_pxa25x())
 		pxa25x_mfp_init();

 	if (cpu_is_pxa27x())
 		pxa27x_mfp_init();

 	/* clear RDH bit to enable GPIO receivers after reset/sleep exit */
 	PSSR = PSSR_RDH;

 	/* initialize gafr_run[], pgsr_lpm[] from existing values */
 	for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
 		gpdr_lpm[i] = GPDR(i * 32);

 	return 0;
 }
 postcore_initcall(pxa2xx_mfp_init);
	/*
	* 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/gpio.h>
	#include <linux/gpio-pxa.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/syscore_ops.h>

	#include <mach/pxa2xx-regs.h>
	#include <mach/mfp-pxa2xx.h>

	#include "generic.h"

	#define PGSR(x) __REG2(0x40F00020, (x) << 2)
	#define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
	#define GAFR_L(x) __GAFR(0, x)
	#define GAFR_U(x) __GAFR(1, x)

	#define BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
	#define GPLR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5))
	#define GPDR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)

	#define PWER_WE35 (1 << 24)

	struct gpio_desc {
	unsigned valid : 1;
	unsigned can_wakeup : 1;
	unsigned keypad_gpio : 1;
	unsigned dir_inverted : 1;
	unsigned int mask; /* bit mask in PWER or PKWR */
	unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
	unsigned long config;
	};

	static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];

	static unsigned long gpdr_lpm[4];

	static int __mfp_config_gpio(unsigned gpio, unsigned long c)
	{
	unsigned long gafr, mask = GPIO_bit(gpio);
	int bank = gpio_to_bank(gpio);
	int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
	int shft = (gpio & 0xf) << 1;
	int fn = MFP_AF(c);
	int is_out = (c & MFP_DIR_OUT) ? 1 : 0;

	if (fn > 3)
	return -EINVAL;

	/* alternate function and direction at run-time */
	gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
	gafr = (gafr & ~(0x3 << shft)) \| (fn << shft);

	if (uorl == 0)
	GAFR_L(bank) = gafr;
	else
	GAFR_U(bank) = gafr;

	if (is_out ^ gpio_desc[gpio].dir_inverted)
	GPDR(gpio) \|= mask;
	else
	GPDR(gpio) &= ~mask;

	/* alternate function and direction at low power mode */
	switch (c & MFP_LPM_STATE_MASK) {
	case MFP_LPM_DRIVE_HIGH:
	PGSR(bank) \|= mask;
	is_out = 1;
	break;
	case MFP_LPM_DRIVE_LOW:
	PGSR(bank) &= ~mask;
	is_out = 1;
	break;
	case MFP_LPM_INPUT:
	case MFP_LPM_DEFAULT:
	break;
	default:
	/* warning and fall through, treat as MFP_LPM_DEFAULT */
	pr_warning("%s: GPIO%d: unsupported low power mode\n",
	__func__, gpio);
	break;
	}

	if (is_out ^ gpio_desc[gpio].dir_inverted)
	gpdr_lpm[bank] \|= mask;
	else
	gpdr_lpm[bank] &= ~mask;

	/* 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) && is_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);
	}
	}

	void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
	{
	unsigned long flags, c;
	int gpio;

	gpio = __mfp_validate(mfp);
	if (gpio < 0)
	return;

	local_irq_save(flags);

	c = gpio_desc[gpio].config;
	c = (c & ~MFP_LPM_STATE_MASK) \| lpm;
	__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, mux_taken;

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

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

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

	/* Allow keypad GPIOs to wakeup system when
	* configured as generic GPIOs.
	*/
	if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
	(d->config & MFP_LPM_CAN_WAKEUP)) {
	if (on)
	PKWR \|= d->mask;
	else
	PKWR &= ~d->mask;
	return 0;
	}

	mux_taken = (PWER & d->mux_mask) & (~d->mask);
	if (on && mux_taken)
	return -EBUSY;

	if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
	if (on) {
	PWER = (PWER & ~d->mux_mask) \| 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 void __init pxa25x_mfp_init(void)
	{
	int i;

	for (i = 0; i <= pxa_last_gpio; 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);
	}

	/* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
	* direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
	*/
	for (i = 86; i <= pxa_last_gpio; i++)
	gpio_desc[i].dir_inverted = 1;
	}
	#else
	static inline void pxa25x_mfp_init(void) {}
	#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;
	struct gpio_desc *d;

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

	gpio = pxa27x_pkwr_gpio[i];
	d = &gpio_desc[gpio];

	/* skip if configured as generic GPIO */
	if (MFP_AF(d->config) == 0)
	continue;

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

	if (on)
	PKWR \|= mask;
	else
	PKWR &= ~mask;
	return 0;
	}

	#define PWER_WEMUX2_GPIO38 (1 << 16)
	#define PWER_WEMUX2_GPIO53 (2 << 16)
	#define PWER_WEMUX2_GPIO40 (3 << 16)
	#define PWER_WEMUX2_GPIO36 (4 << 16)
	#define PWER_WEMUX2_MASK (7 << 16)
	#define PWER_WEMUX3_GPIO31 (1 << 19)
	#define PWER_WEMUX3_GPIO113 (2 << 19)
	#define PWER_WEMUX3_MASK (3 << 19)

	#define INIT_GPIO_DESC_MUXED(mux, gpio) \
	do { \
	gpio_desc[(gpio)].can_wakeup = 1; \
	gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \
	gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \
	} while (0)

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

	for (i = 0; i <= pxa_last_gpio; 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;

	INIT_GPIO_DESC_MUXED(WEMUX3, 31);
	INIT_GPIO_DESC_MUXED(WEMUX3, 113);
	INIT_GPIO_DESC_MUXED(WEMUX2, 38);
	INIT_GPIO_DESC_MUXED(WEMUX2, 53);
	INIT_GPIO_DESC_MUXED(WEMUX2, 40);
	INIT_GPIO_DESC_MUXED(WEMUX2, 36);
	}
	#else
	static inline void pxa27x_mfp_init(void) {}
	#endif /* CONFIG_PXA27x */

	#ifdef CONFIG_PM
	static unsigned long saved_gafr[2][4];
	static unsigned long saved_gpdr[4];
	static unsigned long saved_pgsr[4];

	static int pxa2xx_mfp_suspend(void)
	{
	int i;

	/* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
	for (i = 0; i < pxa_last_gpio; i++) {
	if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
	(GPDR(i) & GPIO_bit(i))) {
	if (GPLR(i) & GPIO_bit(i))
	PGSR(gpio_to_bank(i)) \|= GPIO_bit(i);
	else
	PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
	}
	}

	for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {

	saved_gafr[0][i] = GAFR_L(i);
	saved_gafr[1][i] = GAFR_U(i);
	saved_gpdr[i] = GPDR(i * 32);
	saved_pgsr[i] = PGSR(i);

	GPDR(i * 32) = gpdr_lpm[i];
	}
	return 0;
	}

	static void pxa2xx_mfp_resume(void)
	{
	int i;

	for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
	GAFR_L(i) = saved_gafr[0][i];
	GAFR_U(i) = saved_gafr[1][i];
	GPDR(i * 32) = saved_gpdr[i];
	PGSR(i) = saved_pgsr[i];
	}
	PSSR = PSSR_RDH \| PSSR_PH;
	}
	#else
	#define pxa2xx_mfp_suspend NULL
	#define pxa2xx_mfp_resume NULL
	#endif

	struct syscore_ops pxa2xx_mfp_syscore_ops = {
	.suspend = pxa2xx_mfp_suspend,
	.resume = pxa2xx_mfp_resume,
	};

	static int __init pxa2xx_mfp_init(void)
	{
	int i;

	if (!cpu_is_pxa2xx())
	return 0;

	if (cpu_is_pxa25x())
	pxa25x_mfp_init();

	if (cpu_is_pxa27x())
	pxa27x_mfp_init();

	/* clear RDH bit to enable GPIO receivers after reset/sleep exit */
	PSSR = PSSR_RDH;

	/* initialize gafr_run[], pgsr_lpm[] from existing values */
	for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
	gpdr_lpm[i] = GPDR(i * 32);

	return 0;
	}
	postcore_initcall(pxa2xx_mfp_init);