[linux-2.6-block.git] / arch / arm / plat-samsung / pm-gpio.c


/* linux/arch/arm/plat-s3c/pm-gpio.c
 *
 * Copyright 2008 Openmoko, Inc.
 * Copyright 2008 Simtec Electronics
 *	Ben Dooks <ben@simtec.co.uk>
 *	http://armlinux.simtec.co.uk/
 *
 * S3C series GPIO PM code
 *
 * 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/kernel.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/gpio.h>

#include <mach/gpio-samsung.h>
#include <plat/gpio-core.h>
#include <plat/pm.h>

/* PM GPIO helpers */

#define OFFS_CON	(0x00)
#define OFFS_DAT	(0x04)
#define OFFS_UP		(0x08)

static void samsung_gpio_pm_1bit_save(struct samsung_gpio_chip *chip)
{
	chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
	chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
}

static void samsung_gpio_pm_1bit_resume(struct samsung_gpio_chip *chip)
{
	void __iomem *base = chip->base;
	u32 old_gpcon = __raw_readl(base + OFFS_CON);
	u32 old_gpdat = __raw_readl(base + OFFS_DAT);
	u32 gps_gpcon = chip->pm_save[0];
	u32 gps_gpdat = chip->pm_save[1];
	u32 gpcon;

	/* GPACON only has one bit per control / data and no PULLUPs.
	 * GPACON[x] = 0 => Output, 1 => SFN */

	/* first set all SFN bits to SFN */

	gpcon = old_gpcon | gps_gpcon;
	__raw_writel(gpcon, base + OFFS_CON);

	/* now set all the other bits */

	__raw_writel(gps_gpdat, base + OFFS_DAT);
	__raw_writel(gps_gpcon, base + OFFS_CON);

	S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
		  chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
}

struct samsung_gpio_pm samsung_gpio_pm_1bit = {
	.save	= samsung_gpio_pm_1bit_save,
	.resume = samsung_gpio_pm_1bit_resume,
};

static void samsung_gpio_pm_2bit_save(struct samsung_gpio_chip *chip)
{
	chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
	chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
	chip->pm_save[2] = __raw_readl(chip->base + OFFS_UP);
}

/* Test whether the given masked+shifted bits of an GPIO configuration
 * are one of the SFN (special function) modes. */

static inline int is_sfn(unsigned long con)
{
	return con >= 2;
}

/* Test if the given masked+shifted GPIO configuration is an input */

static inline int is_in(unsigned long con)
{
	return con == 0;
}

/* Test if the given masked+shifted GPIO configuration is an output */

static inline int is_out(unsigned long con)
{
	return con == 1;
}

/**
 * samsung_gpio_pm_2bit_resume() - restore the given GPIO bank
 * @chip: The chip information to resume.
 *
 * Restore one of the GPIO banks that was saved during suspend. This is
 * not as simple as once thought, due to the possibility of glitches
 * from the order that the CON and DAT registers are set in.
 *
 * The three states the pin can be are {IN,OUT,SFN} which gives us 9
 * combinations of changes to check. Three of these, if the pin stays
 * in the same configuration can be discounted. This leaves us with
 * the following:
 *
 * { IN => OUT }  Change DAT first
 * { IN => SFN }  Change CON first
 * { OUT => SFN } Change CON first, so new data will not glitch
 * { OUT => IN }  Change CON first, so new data will not glitch
 * { SFN => IN }  Change CON first
 * { SFN => OUT } Change DAT first, so new data will not glitch [1]
 *
 * We do not currently deal with the UP registers as these control
 * weak resistors, so a small delay in change should not need to bring
 * these into the calculations.
 *
 * [1] this assumes that writing to a pin DAT whilst in SFN will set the
 *     state for when it is next output.
 */
static void samsung_gpio_pm_2bit_resume(struct samsung_gpio_chip *chip)
{
	void __iomem *base = chip->base;
	u32 old_gpcon = __raw_readl(base + OFFS_CON);
	u32 old_gpdat = __raw_readl(base + OFFS_DAT);
	u32 gps_gpcon = chip->pm_save[0];
	u32 gps_gpdat = chip->pm_save[1];
	u32 gpcon, old, new, mask;
	u32 change_mask = 0x0;
	int nr;

	/* restore GPIO pull-up settings */
	__raw_writel(chip->pm_save[2], base + OFFS_UP);

	/* Create a change_mask of all the items that need to have
	 * their CON value changed before their DAT value, so that
	 * we minimise the work between the two settings.
	 */

	for (nr = 0, mask = 0x03; nr < 32; nr += 2, mask <<= 2) {
		old = (old_gpcon & mask) >> nr;
		new = (gps_gpcon & mask) >> nr;

		/* If there is no change, then skip */

		if (old == new)
			continue;

		/* If both are special function, then skip */

		if (is_sfn(old) && is_sfn(new))
			continue;

		/* Change is IN => OUT, do not change now */

		if (is_in(old) && is_out(new))
			continue;

		/* Change is SFN => OUT, do not change now */

		if (is_sfn(old) && is_out(new))
			continue;

		/* We should now be at the case of IN=>SFN,
		 * OUT=>SFN, OUT=>IN, SFN=>IN. */

		change_mask |= mask;
	}


	/* Write the new CON settings */

	gpcon = old_gpcon & ~change_mask;
	gpcon |= gps_gpcon & change_mask;

	__raw_writel(gpcon, base + OFFS_CON);

	/* Now change any items that require DAT,CON */

	__raw_writel(gps_gpdat, base + OFFS_DAT);
	__raw_writel(gps_gpcon, base + OFFS_CON);

	S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
		  chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
}

struct samsung_gpio_pm samsung_gpio_pm_2bit = {
	.save	= samsung_gpio_pm_2bit_save,
	.resume = samsung_gpio_pm_2bit_resume,
};

#if defined(CONFIG_ARCH_S3C64XX) || defined(CONFIG_PLAT_S5P) \
	|| defined(CONFIG_ARCH_EXYNOS)
static void samsung_gpio_pm_4bit_save(struct samsung_gpio_chip *chip)
{
	chip->pm_save[1] = __raw_readl(chip->base + OFFS_CON);
	chip->pm_save[2] = __raw_readl(chip->base + OFFS_DAT);
	chip->pm_save[3] = __raw_readl(chip->base + OFFS_UP);

	if (chip->chip.ngpio > 8)
		chip->pm_save[0] = __raw_readl(chip->base - 4);
}

static u32 samsung_gpio_pm_4bit_mask(u32 old_gpcon, u32 gps_gpcon)
{
	u32 old, new, mask;
	u32 change_mask = 0x0;
	int nr;

	for (nr = 0, mask = 0x0f; nr < 16; nr += 4, mask <<= 4) {
		old = (old_gpcon & mask) >> nr;
		new = (gps_gpcon & mask) >> nr;

		/* If there is no change, then skip */

		if (old == new)
			continue;

		/* If both are special function, then skip */

		if (is_sfn(old) && is_sfn(new))
			continue;

		/* Change is IN => OUT, do not change now */

		if (is_in(old) && is_out(new))
			continue;

		/* Change is SFN => OUT, do not change now */

		if (is_sfn(old) && is_out(new))
			continue;

		/* We should now be at the case of IN=>SFN,
		 * OUT=>SFN, OUT=>IN, SFN=>IN. */

		change_mask |= mask;
	}

	return change_mask;
}

static void samsung_gpio_pm_4bit_con(struct samsung_gpio_chip *chip, int index)
{
	void __iomem *con = chip->base + (index * 4);
	u32 old_gpcon = __raw_readl(con);
	u32 gps_gpcon = chip->pm_save[index + 1];
	u32 gpcon, mask;

	mask = samsung_gpio_pm_4bit_mask(old_gpcon, gps_gpcon);

	gpcon = old_gpcon & ~mask;
	gpcon |= gps_gpcon & mask;

	__raw_writel(gpcon, con);
}

static void samsung_gpio_pm_4bit_resume(struct samsung_gpio_chip *chip)
{
	void __iomem *base = chip->base;
	u32 old_gpcon[2];
	u32 old_gpdat = __raw_readl(base + OFFS_DAT);
	u32 gps_gpdat = chip->pm_save[2];

	/* First, modify the CON settings */

	old_gpcon[0] = 0;
	old_gpcon[1] = __raw_readl(base + OFFS_CON);

	samsung_gpio_pm_4bit_con(chip, 0);
	if (chip->chip.ngpio > 8) {
		old_gpcon[0] = __raw_readl(base - 4);
		samsung_gpio_pm_4bit_con(chip, -1);
	}

	/* Now change the configurations that require DAT,CON */

	__raw_writel(chip->pm_save[2], base + OFFS_DAT);
	__raw_writel(chip->pm_save[1], base + OFFS_CON);
	if (chip->chip.ngpio > 8)
		__raw_writel(chip->pm_save[0], base - 4);

	__raw_writel(chip->pm_save[2], base + OFFS_DAT);
	__raw_writel(chip->pm_save[3], base + OFFS_UP);

	if (chip->chip.ngpio > 8) {
		S3C_PMDBG("%s: CON4 %08x,%08x => %08x,%08x, DAT %08x => %08x\n",
			  chip->chip.label, old_gpcon[0], old_gpcon[1],
			  __raw_readl(base - 4),
			  __raw_readl(base + OFFS_CON),
			  old_gpdat, gps_gpdat);
	} else
		S3C_PMDBG("%s: CON4 %08x => %08x, DAT %08x => %08x\n",
			  chip->chip.label, old_gpcon[1],
			  __raw_readl(base + OFFS_CON),
			  old_gpdat, gps_gpdat);
}

struct samsung_gpio_pm samsung_gpio_pm_4bit = {
	.save	= samsung_gpio_pm_4bit_save,
	.resume = samsung_gpio_pm_4bit_resume,
};
#endif /* CONFIG_ARCH_S3C64XX || CONFIG_PLAT_S5P || CONFIG_ARCH_EXYNOS */

/**
 * samsung_pm_save_gpio() - save gpio chip data for suspend
 * @ourchip: The chip for suspend.
 */
static void samsung_pm_save_gpio(struct samsung_gpio_chip *ourchip)
{
	struct samsung_gpio_pm *pm = ourchip->pm;

	if (pm == NULL || pm->save == NULL)
		S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
	else
		pm->save(ourchip);
}

/**
 * samsung_pm_save_gpios() - Save the state of the GPIO banks.
 *
 * For all the GPIO banks, save the state of each one ready for going
 * into a suspend mode.
 */
void samsung_pm_save_gpios(void)
{
	struct samsung_gpio_chip *ourchip;
	unsigned int gpio_nr;

	for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
		ourchip = samsung_gpiolib_getchip(gpio_nr);
		if (!ourchip) {
			gpio_nr++;
			continue;
		}

		samsung_pm_save_gpio(ourchip);

		S3C_PMDBG("%s: save %08x,%08x,%08x,%08x\n",
			  ourchip->chip.label,
			  ourchip->pm_save[0],
			  ourchip->pm_save[1],
			  ourchip->pm_save[2],
			  ourchip->pm_save[3]);

		gpio_nr += ourchip->chip.ngpio;
		gpio_nr += CONFIG_S3C_GPIO_SPACE;
	}
}

/**
 * samsung_pm_resume_gpio() - restore gpio chip data after suspend
 * @ourchip: The suspended chip.
 */
static void samsung_pm_resume_gpio(struct samsung_gpio_chip *ourchip)
{
	struct samsung_gpio_pm *pm = ourchip->pm;

	if (pm == NULL || pm->resume == NULL)
		S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
	else
		pm->resume(ourchip);
}

void samsung_pm_restore_gpios(void)
{
	struct samsung_gpio_chip *ourchip;
	unsigned int gpio_nr;

	for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
		ourchip = samsung_gpiolib_getchip(gpio_nr);
		if (!ourchip) {
			gpio_nr++;
			continue;
		}

		samsung_pm_resume_gpio(ourchip);

		gpio_nr += ourchip->chip.ngpio;
		gpio_nr += CONFIG_S3C_GPIO_SPACE;
	}
}
Commit	Line	Data
d87964c4 BD	1
	2	/* linux/arch/arm/plat-s3c/pm-gpio.c
	3	*
	4	* Copyright 2008 Openmoko, Inc.
	5	* Copyright 2008 Simtec Electronics
	6	* Ben Dooks <ben@simtec.co.uk>
	7	* http://armlinux.simtec.co.uk/
	8	*
	9	* S3C series GPIO PM code
	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/kernel.h>
edbaa603	17	#include <linux/device.h>
d87964c4 BD	18	#include <linux/init.h>
	19	#include <linux/io.h>
	20	#include <linux/gpio.h>
	21
b0161caa	22	#include <mach/gpio-samsung.h>
e856bb1f	23	#include <plat/gpio-core.h>
d87964c4 BD	24	#include <plat/pm.h>
	25
	26	/* PM GPIO helpers */
	27
	28	#define OFFS_CON (0x00)
	29	#define OFFS_DAT (0x04)
	30	#define OFFS_UP (0x08)
	31
782d8a3c	32	static void samsung_gpio_pm_1bit_save(struct samsung_gpio_chip *chip)
d87964c4 BD	33	{
	34	chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
	35	chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
	36	}
	37
782d8a3c	38	static void samsung_gpio_pm_1bit_resume(struct samsung_gpio_chip *chip)
d87964c4 BD	39	{
	40	void __iomem *base = chip->base;
	41	u32 old_gpcon = __raw_readl(base + OFFS_CON);
	42	u32 old_gpdat = __raw_readl(base + OFFS_DAT);
	43	u32 gps_gpcon = chip->pm_save[0];
	44	u32 gps_gpdat = chip->pm_save[1];
	45	u32 gpcon;
	46
	47	/* GPACON only has one bit per control / data and no PULLUPs.
	48	* GPACON[x] = 0 => Output, 1 => SFN */
	49
	50	/* first set all SFN bits to SFN */
	51
	52	gpcon = old_gpcon \| gps_gpcon;
	53	__raw_writel(gpcon, base + OFFS_CON);
	54
	55	/* now set all the other bits */
	56
	57	__raw_writel(gps_gpdat, base + OFFS_DAT);
	58	__raw_writel(gps_gpcon, base + OFFS_CON);
	59
	60	S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
	61	chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
	62	}
	63
782d8a3c KK	64	struct samsung_gpio_pm samsung_gpio_pm_1bit = {
	65	.save = samsung_gpio_pm_1bit_save,
	66	.resume = samsung_gpio_pm_1bit_resume,
d87964c4 BD	67	};
d87964c4 BD	68
782d8a3c	69	static void samsung_gpio_pm_2bit_save(struct samsung_gpio_chip *chip)
d87964c4 BD	70	{
	71	chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
	72	chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
	73	chip->pm_save[2] = __raw_readl(chip->base + OFFS_UP);
	74	}
	75
	76	/* Test whether the given masked+shifted bits of an GPIO configuration
	77	* are one of the SFN (special function) modes. */
	78
	79	static inline int is_sfn(unsigned long con)
	80	{
	81	return con >= 2;
	82	}
	83
	84	/* Test if the given masked+shifted GPIO configuration is an input */
	85
	86	static inline int is_in(unsigned long con)
	87	{
	88	return con == 0;
	89	}
	90
	91	/* Test if the given masked+shifted GPIO configuration is an output */
	92
	93	static inline int is_out(unsigned long con)
	94	{
	95	return con == 1;
	96	}
	97
	98	/**
782d8a3c	99	* samsung_gpio_pm_2bit_resume() - restore the given GPIO bank
d87964c4 BD	100	* @chip: The chip information to resume.
	101	*
	102	* Restore one of the GPIO banks that was saved during suspend. This is
	103	* not as simple as once thought, due to the possibility of glitches
	104	* from the order that the CON and DAT registers are set in.
	105	*
	106	* The three states the pin can be are {IN,OUT,SFN} which gives us 9
	107	* combinations of changes to check. Three of these, if the pin stays
	108	* in the same configuration can be discounted. This leaves us with
	109	* the following:
	110	*
	111	* { IN => OUT } Change DAT first
	112	* { IN => SFN } Change CON first
	113	* { OUT => SFN } Change CON first, so new data will not glitch
	114	* { OUT => IN } Change CON first, so new data will not glitch
	115	* { SFN => IN } Change CON first
	116	* { SFN => OUT } Change DAT first, so new data will not glitch [1]
	117	*
	118	* We do not currently deal with the UP registers as these control
	119	* weak resistors, so a small delay in change should not need to bring
	120	* these into the calculations.
	121	*
	122	* [1] this assumes that writing to a pin DAT whilst in SFN will set the
	123	* state for when it is next output.
	124	*/
782d8a3c	125	static void samsung_gpio_pm_2bit_resume(struct samsung_gpio_chip *chip)
d87964c4 BD	126	{
	127	void __iomem *base = chip->base;
	128	u32 old_gpcon = __raw_readl(base + OFFS_CON);
	129	u32 old_gpdat = __raw_readl(base + OFFS_DAT);
	130	u32 gps_gpcon = chip->pm_save[0];
	131	u32 gps_gpdat = chip->pm_save[1];
	132	u32 gpcon, old, new, mask;
	133	u32 change_mask = 0x0;
	134	int nr;
	135
	136	/* restore GPIO pull-up settings */
	137	__raw_writel(chip->pm_save[2], base + OFFS_UP);
	138
	139	/* Create a change_mask of all the items that need to have
	140	* their CON value changed before their DAT value, so that
	141	* we minimise the work between the two settings.
	142	*/
	143
	144	for (nr = 0, mask = 0x03; nr < 32; nr += 2, mask <<= 2) {
	145	old = (old_gpcon & mask) >> nr;
	146	new = (gps_gpcon & mask) >> nr;
	147
	148	/* If there is no change, then skip */
	149
	150	if (old == new)
	151	continue;
	152
	153	/* If both are special function, then skip */
	154
	155	if (is_sfn(old) && is_sfn(new))
	156	continue;
	157
	158	/* Change is IN => OUT, do not change now */
	159
	160	if (is_in(old) && is_out(new))
	161	continue;
	162
	163	/* Change is SFN => OUT, do not change now */
	164
	165	if (is_sfn(old) && is_out(new))
	166	continue;
	167
	168	/* We should now be at the case of IN=>SFN,
	169	* OUT=>SFN, OUT=>IN, SFN=>IN. */
	170
	171	change_mask \|= mask;
	172	}
	173
	174
	175	/* Write the new CON settings */
	176
	177	gpcon = old_gpcon & ~change_mask;
	178	gpcon \|= gps_gpcon & change_mask;
	179
	180	__raw_writel(gpcon, base + OFFS_CON);
	181
	182	/* Now change any items that require DAT,CON */
	183
	184	__raw_writel(gps_gpdat, base + OFFS_DAT);
	185	__raw_writel(gps_gpcon, base + OFFS_CON);
	186
	187	S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
	188	chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
	189	}
190
782d8a3c KK	191	struct samsung_gpio_pm samsung_gpio_pm_2bit = {
	192	.save = samsung_gpio_pm_2bit_save,
	193	.resume = samsung_gpio_pm_2bit_resume,
d87964c4 BD	194	};
d87964c4 BD	195
e245f969 TF	196	#if defined(CONFIG_ARCH_S3C64XX) \|\| defined(CONFIG_PLAT_S5P) \
e245f969 TF	197	\|\| defined(CONFIG_ARCH_EXYNOS)
782d8a3c	198	static void samsung_gpio_pm_4bit_save(struct samsung_gpio_chip *chip)
d87964c4 BD	199	{
	200	chip->pm_save[1] = __raw_readl(chip->base + OFFS_CON);
	201	chip->pm_save[2] = __raw_readl(chip->base + OFFS_DAT);
	202	chip->pm_save[3] = __raw_readl(chip->base + OFFS_UP);
	203
	204	if (chip->chip.ngpio > 8)
	205	chip->pm_save[0] = __raw_readl(chip->base - 4);
	206	}
	207
782d8a3c	208	static u32 samsung_gpio_pm_4bit_mask(u32 old_gpcon, u32 gps_gpcon)
d87964c4 BD	209	{
	210	u32 old, new, mask;
	211	u32 change_mask = 0x0;
	212	int nr;
	213
	214	for (nr = 0, mask = 0x0f; nr < 16; nr += 4, mask <<= 4) {
	215	old = (old_gpcon & mask) >> nr;
	216	new = (gps_gpcon & mask) >> nr;
	217
	218	/* If there is no change, then skip */
	219
	220	if (old == new)
	221	continue;
	222
	223	/* If both are special function, then skip */
	224
	225	if (is_sfn(old) && is_sfn(new))
	226	continue;
	227
	228	/* Change is IN => OUT, do not change now */
	229
	230	if (is_in(old) && is_out(new))
	231	continue;
	232
	233	/* Change is SFN => OUT, do not change now */
	234
	235	if (is_sfn(old) && is_out(new))
	236	continue;
	237
	238	/* We should now be at the case of IN=>SFN,
	239	* OUT=>SFN, OUT=>IN, SFN=>IN. */
	240
	241	change_mask \|= mask;
	242	}
	243
	244	return change_mask;
	245	}
	246
782d8a3c	247	static void samsung_gpio_pm_4bit_con(struct samsung_gpio_chip *chip, int index)
d87964c4 BD	248	{
	249	void __iomem con = chip->base + (index 4);
	250	u32 old_gpcon = __raw_readl(con);
	251	u32 gps_gpcon = chip->pm_save[index + 1];
	252	u32 gpcon, mask;
	253
782d8a3c	254	mask = samsung_gpio_pm_4bit_mask(old_gpcon, gps_gpcon);
d87964c4 BD	255
	256	gpcon = old_gpcon & ~mask;
	257	gpcon \|= gps_gpcon & mask;
	258
	259	__raw_writel(gpcon, con);
	260	}
	261
782d8a3c	262	static void samsung_gpio_pm_4bit_resume(struct samsung_gpio_chip *chip)
d87964c4 BD	263	{
	264	void __iomem *base = chip->base;
	265	u32 old_gpcon[2];
	266	u32 old_gpdat = __raw_readl(base + OFFS_DAT);
	267	u32 gps_gpdat = chip->pm_save[2];
	268
	269	/* First, modify the CON settings */
	270
	271	old_gpcon[0] = 0;
	272	old_gpcon[1] = __raw_readl(base + OFFS_CON);
	273
782d8a3c	274	samsung_gpio_pm_4bit_con(chip, 0);
d87964c4 BD	275	if (chip->chip.ngpio > 8) {
d87964c4 BD	276	old_gpcon[0] = __raw_readl(base - 4);
782d8a3c	277	samsung_gpio_pm_4bit_con(chip, -1);
d87964c4 BD	278	}
	279
	280	/* Now change the configurations that require DAT,CON */
	281
	282	__raw_writel(chip->pm_save[2], base + OFFS_DAT);
	283	__raw_writel(chip->pm_save[1], base + OFFS_CON);
	284	if (chip->chip.ngpio > 8)
	285	__raw_writel(chip->pm_save[0], base - 4);
	286
	287	__raw_writel(chip->pm_save[2], base + OFFS_DAT);
	288	__raw_writel(chip->pm_save[3], base + OFFS_UP);
	289
	290	if (chip->chip.ngpio > 8) {
	291	S3C_PMDBG("%s: CON4 %08x,%08x => %08x,%08x, DAT %08x => %08x\n",
	292	chip->chip.label, old_gpcon[0], old_gpcon[1],
	293	__raw_readl(base - 4),
	294	__raw_readl(base + OFFS_CON),
	295	old_gpdat, gps_gpdat);
	296	} else
	297	S3C_PMDBG("%s: CON4 %08x => %08x, DAT %08x => %08x\n",
	298	chip->chip.label, old_gpcon[1],
	299	__raw_readl(base + OFFS_CON),
	300	old_gpdat, gps_gpdat);
	301	}
	302
782d8a3c KK	303	struct samsung_gpio_pm samsung_gpio_pm_4bit = {
	304	.save = samsung_gpio_pm_4bit_save,
	305	.resume = samsung_gpio_pm_4bit_resume,
d87964c4	306	};
e245f969	307	#endif /* CONFIG_ARCH_S3C64XX \|\| CONFIG_PLAT_S5P \|\| CONFIG_ARCH_EXYNOS */
d87964c4 BD	308
d87964c4 BD	309	/**
782d8a3c	310	* samsung_pm_save_gpio() - save gpio chip data for suspend
d87964c4 BD	311	* @ourchip: The chip for suspend.
d87964c4 BD	312	*/
782d8a3c	313	static void samsung_pm_save_gpio(struct samsung_gpio_chip *ourchip)
d87964c4	314	{
782d8a3c	315	struct samsung_gpio_pm *pm = ourchip->pm;
d87964c4 BD	316
	317	if (pm == NULL \|\| pm->save == NULL)
	318	S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
	319	else
	320	pm->save(ourchip);
	321	}
	322
	323	/**
782d8a3c	324	* samsung_pm_save_gpios() - Save the state of the GPIO banks.
d87964c4 BD	325	*
	326	* For all the GPIO banks, save the state of each one ready for going
	327	* into a suspend mode.
	328	*/
782d8a3c	329	void samsung_pm_save_gpios(void)
d87964c4	330	{
782d8a3c	331	struct samsung_gpio_chip *ourchip;
d87964c4 BD	332	unsigned int gpio_nr;
d87964c4 BD	333
32b6cb38	334	for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
782d8a3c	335	ourchip = samsung_gpiolib_getchip(gpio_nr);
91dc74e4 P	336	if (!ourchip) {
91dc74e4 P	337	gpio_nr++;
d87964c4	338	continue;
91dc74e4	339	}
d87964c4	340
782d8a3c	341	samsung_pm_save_gpio(ourchip);
d87964c4 BD	342
	343	S3C_PMDBG("%s: save %08x,%08x,%08x,%08x\n",
	344	ourchip->chip.label,
	345	ourchip->pm_save[0],
	346	ourchip->pm_save[1],
	347	ourchip->pm_save[2],
	348	ourchip->pm_save[3]);
	349
	350	gpio_nr += ourchip->chip.ngpio;
	351	gpio_nr += CONFIG_S3C_GPIO_SPACE;
	352	}
	353	}
	354
	355	/**
782d8a3c	356	* samsung_pm_resume_gpio() - restore gpio chip data after suspend
d87964c4 BD	357	* @ourchip: The suspended chip.
d87964c4 BD	358	*/
782d8a3c	359	static void samsung_pm_resume_gpio(struct samsung_gpio_chip *ourchip)
d87964c4	360	{
782d8a3c	361	struct samsung_gpio_pm *pm = ourchip->pm;
d87964c4 BD	362
	363	if (pm == NULL \|\| pm->resume == NULL)
	364	S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
	365	else
	366	pm->resume(ourchip);
	367	}
	368
782d8a3c	369	void samsung_pm_restore_gpios(void)
d87964c4	370	{
782d8a3c	371	struct samsung_gpio_chip *ourchip;
d87964c4 BD	372	unsigned int gpio_nr;
d87964c4 BD	373
32b6cb38	374	for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
782d8a3c	375	ourchip = samsung_gpiolib_getchip(gpio_nr);
91dc74e4 P	376	if (!ourchip) {
91dc74e4 P	377	gpio_nr++;
d87964c4	378	continue;
91dc74e4	379	}
d87964c4	380
782d8a3c	381	samsung_pm_resume_gpio(ourchip);
d87964c4 BD	382
	383	gpio_nr += ourchip->chip.ngpio;
	384	gpio_nr += CONFIG_S3C_GPIO_SPACE;
	385	}
	386	}