[deliverable/linux.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>

#if defined(CONFIG_ARCH_S3C24XX) || defined(CONFIG_ARCH_S3C64XX)
#include <mach/gpio-samsung.h>
#endif

#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)
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 */

/**
 * 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
785acec3	22	#if defined(CONFIG_ARCH_S3C24XX) \|\| defined(CONFIG_ARCH_S3C64XX)
b0161caa	23	#include <mach/gpio-samsung.h>
785acec3 SK	24	#endif
785acec3 SK	25
e856bb1f	26	#include <plat/gpio-core.h>
d87964c4 BD	27	#include <plat/pm.h>
	28
	29	/* PM GPIO helpers */
	30
	31	#define OFFS_CON (0x00)
	32	#define OFFS_DAT (0x04)
	33	#define OFFS_UP (0x08)
	34
782d8a3c	35	static void samsung_gpio_pm_1bit_save(struct samsung_gpio_chip *chip)
d87964c4 BD	36	{
	37	chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
	38	chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
	39	}
	40
782d8a3c	41	static void samsung_gpio_pm_1bit_resume(struct samsung_gpio_chip *chip)
d87964c4 BD	42	{
	43	void __iomem *base = chip->base;
	44	u32 old_gpcon = __raw_readl(base + OFFS_CON);
	45	u32 old_gpdat = __raw_readl(base + OFFS_DAT);
	46	u32 gps_gpcon = chip->pm_save[0];
	47	u32 gps_gpdat = chip->pm_save[1];
	48	u32 gpcon;
	49
	50	/* GPACON only has one bit per control / data and no PULLUPs.
	51	* GPACON[x] = 0 => Output, 1 => SFN */
	52
	53	/* first set all SFN bits to SFN */
	54
	55	gpcon = old_gpcon \| gps_gpcon;
	56	__raw_writel(gpcon, base + OFFS_CON);
	57
	58	/* now set all the other bits */
	59
	60	__raw_writel(gps_gpdat, base + OFFS_DAT);
	61	__raw_writel(gps_gpcon, base + OFFS_CON);
	62
	63	S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
	64	chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
	65	}
	66
782d8a3c KK	67	struct samsung_gpio_pm samsung_gpio_pm_1bit = {
	68	.save = samsung_gpio_pm_1bit_save,
	69	.resume = samsung_gpio_pm_1bit_resume,
d87964c4 BD	70	};
d87964c4 BD	71
782d8a3c	72	static void samsung_gpio_pm_2bit_save(struct samsung_gpio_chip *chip)
d87964c4 BD	73	{
	74	chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
	75	chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
	76	chip->pm_save[2] = __raw_readl(chip->base + OFFS_UP);
	77	}
	78
	79	/* Test whether the given masked+shifted bits of an GPIO configuration
	80	* are one of the SFN (special function) modes. */
	81
	82	static inline int is_sfn(unsigned long con)
	83	{
	84	return con >= 2;
	85	}
	86
	87	/* Test if the given masked+shifted GPIO configuration is an input */
	88
	89	static inline int is_in(unsigned long con)
	90	{
	91	return con == 0;
	92	}
	93
	94	/* Test if the given masked+shifted GPIO configuration is an output */
	95
	96	static inline int is_out(unsigned long con)
	97	{
	98	return con == 1;
	99	}
	100
	101	/**
782d8a3c	102	* samsung_gpio_pm_2bit_resume() - restore the given GPIO bank
d87964c4 BD	103	* @chip: The chip information to resume.
	104	*
	105	* Restore one of the GPIO banks that was saved during suspend. This is
	106	* not as simple as once thought, due to the possibility of glitches
	107	* from the order that the CON and DAT registers are set in.
	108	*
	109	* The three states the pin can be are {IN,OUT,SFN} which gives us 9
	110	* combinations of changes to check. Three of these, if the pin stays
	111	* in the same configuration can be discounted. This leaves us with
	112	* the following:
	113	*
	114	* { IN => OUT } Change DAT first
	115	* { IN => SFN } Change CON first
	116	* { OUT => SFN } Change CON first, so new data will not glitch
	117	* { OUT => IN } Change CON first, so new data will not glitch
	118	* { SFN => IN } Change CON first
	119	* { SFN => OUT } Change DAT first, so new data will not glitch [1]
	120	*
	121	* We do not currently deal with the UP registers as these control
	122	* weak resistors, so a small delay in change should not need to bring
	123	* these into the calculations.
	124	*
	125	* [1] this assumes that writing to a pin DAT whilst in SFN will set the
	126	* state for when it is next output.
	127	*/
782d8a3c	128	static void samsung_gpio_pm_2bit_resume(struct samsung_gpio_chip *chip)
d87964c4 BD	129	{
	130	void __iomem *base = chip->base;
	131	u32 old_gpcon = __raw_readl(base + OFFS_CON);
	132	u32 old_gpdat = __raw_readl(base + OFFS_DAT);
	133	u32 gps_gpcon = chip->pm_save[0];
	134	u32 gps_gpdat = chip->pm_save[1];
	135	u32 gpcon, old, new, mask;
	136	u32 change_mask = 0x0;
	137	int nr;
	138
	139	/* restore GPIO pull-up settings */
	140	__raw_writel(chip->pm_save[2], base + OFFS_UP);
	141
	142	/* Create a change_mask of all the items that need to have
	143	* their CON value changed before their DAT value, so that
	144	* we minimise the work between the two settings.
	145	*/
	146
	147	for (nr = 0, mask = 0x03; nr < 32; nr += 2, mask <<= 2) {
	148	old = (old_gpcon & mask) >> nr;
	149	new = (gps_gpcon & mask) >> nr;
	150
	151	/* If there is no change, then skip */
	152
	153	if (old == new)
	154	continue;
	155
	156	/* If both are special function, then skip */
	157
	158	if (is_sfn(old) && is_sfn(new))
	159	continue;
	160
	161	/* Change is IN => OUT, do not change now */
	162
	163	if (is_in(old) && is_out(new))
	164	continue;
	165
	166	/* Change is SFN => OUT, do not change now */
	167
	168	if (is_sfn(old) && is_out(new))
	169	continue;
	170
	171	/* We should now be at the case of IN=>SFN,
	172	* OUT=>SFN, OUT=>IN, SFN=>IN. */
	173
	174	change_mask \|= mask;
	175	}
	176
	177
	178	/* Write the new CON settings */
	179
	180	gpcon = old_gpcon & ~change_mask;
	181	gpcon \|= gps_gpcon & change_mask;
	182
	183	__raw_writel(gpcon, base + OFFS_CON);
	184
	185	/* Now change any items that require DAT,CON */
	186
	187	__raw_writel(gps_gpdat, base + OFFS_DAT);
	188	__raw_writel(gps_gpcon, base + OFFS_CON);
	189
	190	S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
	191	chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
	192	}
193
782d8a3c KK	194	struct samsung_gpio_pm samsung_gpio_pm_2bit = {
	195	.save = samsung_gpio_pm_2bit_save,
	196	.resume = samsung_gpio_pm_2bit_resume,
d87964c4 BD	197	};
d87964c4 BD	198
d78c16cc	199	#if defined(CONFIG_ARCH_S3C64XX)
782d8a3c	200	static void samsung_gpio_pm_4bit_save(struct samsung_gpio_chip *chip)
d87964c4 BD	201	{
	202	chip->pm_save[1] = __raw_readl(chip->base + OFFS_CON);
	203	chip->pm_save[2] = __raw_readl(chip->base + OFFS_DAT);
	204	chip->pm_save[3] = __raw_readl(chip->base + OFFS_UP);
	205
	206	if (chip->chip.ngpio > 8)
	207	chip->pm_save[0] = __raw_readl(chip->base - 4);
	208	}
	209
782d8a3c	210	static u32 samsung_gpio_pm_4bit_mask(u32 old_gpcon, u32 gps_gpcon)
d87964c4 BD	211	{
	212	u32 old, new, mask;
	213	u32 change_mask = 0x0;
	214	int nr;
	215
	216	for (nr = 0, mask = 0x0f; nr < 16; nr += 4, mask <<= 4) {
	217	old = (old_gpcon & mask) >> nr;
	218	new = (gps_gpcon & mask) >> nr;
	219
	220	/* If there is no change, then skip */
	221
	222	if (old == new)
	223	continue;
	224
	225	/* If both are special function, then skip */
	226
	227	if (is_sfn(old) && is_sfn(new))
	228	continue;
	229
	230	/* Change is IN => OUT, do not change now */
	231
	232	if (is_in(old) && is_out(new))
	233	continue;
	234
	235	/* Change is SFN => OUT, do not change now */
	236
	237	if (is_sfn(old) && is_out(new))
	238	continue;
	239
	240	/* We should now be at the case of IN=>SFN,
	241	* OUT=>SFN, OUT=>IN, SFN=>IN. */
	242
	243	change_mask \|= mask;
	244	}
	245
	246	return change_mask;
	247	}
	248
782d8a3c	249	static void samsung_gpio_pm_4bit_con(struct samsung_gpio_chip *chip, int index)
d87964c4 BD	250	{
	251	void __iomem con = chip->base + (index 4);
	252	u32 old_gpcon = __raw_readl(con);
	253	u32 gps_gpcon = chip->pm_save[index + 1];
	254	u32 gpcon, mask;
	255
782d8a3c	256	mask = samsung_gpio_pm_4bit_mask(old_gpcon, gps_gpcon);
d87964c4 BD	257
	258	gpcon = old_gpcon & ~mask;
	259	gpcon \|= gps_gpcon & mask;
	260
	261	__raw_writel(gpcon, con);
	262	}
	263
782d8a3c	264	static void samsung_gpio_pm_4bit_resume(struct samsung_gpio_chip *chip)
d87964c4 BD	265	{
	266	void __iomem *base = chip->base;
	267	u32 old_gpcon[2];
	268	u32 old_gpdat = __raw_readl(base + OFFS_DAT);
	269	u32 gps_gpdat = chip->pm_save[2];
	270
	271	/* First, modify the CON settings */
	272
	273	old_gpcon[0] = 0;
	274	old_gpcon[1] = __raw_readl(base + OFFS_CON);
	275
782d8a3c	276	samsung_gpio_pm_4bit_con(chip, 0);
d87964c4 BD	277	if (chip->chip.ngpio > 8) {
d87964c4 BD	278	old_gpcon[0] = __raw_readl(base - 4);
782d8a3c	279	samsung_gpio_pm_4bit_con(chip, -1);
d87964c4 BD	280	}
	281
	282	/* Now change the configurations that require DAT,CON */
	283
	284	__raw_writel(chip->pm_save[2], base + OFFS_DAT);
	285	__raw_writel(chip->pm_save[1], base + OFFS_CON);
	286	if (chip->chip.ngpio > 8)
	287	__raw_writel(chip->pm_save[0], base - 4);
	288
	289	__raw_writel(chip->pm_save[2], base + OFFS_DAT);
	290	__raw_writel(chip->pm_save[3], base + OFFS_UP);
	291
	292	if (chip->chip.ngpio > 8) {
	293	S3C_PMDBG("%s: CON4 %08x,%08x => %08x,%08x, DAT %08x => %08x\n",
	294	chip->chip.label, old_gpcon[0], old_gpcon[1],
	295	__raw_readl(base - 4),
	296	__raw_readl(base + OFFS_CON),
	297	old_gpdat, gps_gpdat);
	298	} else
	299	S3C_PMDBG("%s: CON4 %08x => %08x, DAT %08x => %08x\n",
	300	chip->chip.label, old_gpcon[1],
	301	__raw_readl(base + OFFS_CON),
	302	old_gpdat, gps_gpdat);
	303	}
	304
782d8a3c KK	305	struct samsung_gpio_pm samsung_gpio_pm_4bit = {
	306	.save = samsung_gpio_pm_4bit_save,
	307	.resume = samsung_gpio_pm_4bit_resume,
d87964c4	308	};
d78c16cc	309	#endif /* CONFIG_ARCH_S3C64XX */
d87964c4 BD	310
d87964c4 BD	311	/**
782d8a3c	312	* samsung_pm_save_gpio() - save gpio chip data for suspend
d87964c4 BD	313	* @ourchip: The chip for suspend.
d87964c4 BD	314	*/
782d8a3c	315	static void samsung_pm_save_gpio(struct samsung_gpio_chip *ourchip)
d87964c4	316	{
782d8a3c	317	struct samsung_gpio_pm *pm = ourchip->pm;
d87964c4 BD	318
	319	if (pm == NULL \|\| pm->save == NULL)
	320	S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
	321	else
	322	pm->save(ourchip);
	323	}
	324
	325	/**
782d8a3c	326	* samsung_pm_save_gpios() - Save the state of the GPIO banks.
d87964c4 BD	327	*
	328	* For all the GPIO banks, save the state of each one ready for going
	329	* into a suspend mode.
	330	*/
782d8a3c	331	void samsung_pm_save_gpios(void)
d87964c4	332	{
782d8a3c	333	struct samsung_gpio_chip *ourchip;
d87964c4 BD	334	unsigned int gpio_nr;
d87964c4 BD	335
32b6cb38	336	for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
782d8a3c	337	ourchip = samsung_gpiolib_getchip(gpio_nr);
91dc74e4 P	338	if (!ourchip) {
91dc74e4 P	339	gpio_nr++;
d87964c4	340	continue;
91dc74e4	341	}
d87964c4	342
782d8a3c	343	samsung_pm_save_gpio(ourchip);
d87964c4 BD	344
	345	S3C_PMDBG("%s: save %08x,%08x,%08x,%08x\n",
	346	ourchip->chip.label,
	347	ourchip->pm_save[0],
	348	ourchip->pm_save[1],
	349	ourchip->pm_save[2],
	350	ourchip->pm_save[3]);
	351
	352	gpio_nr += ourchip->chip.ngpio;
	353	gpio_nr += CONFIG_S3C_GPIO_SPACE;
	354	}
	355	}
	356
	357	/**
782d8a3c	358	* samsung_pm_resume_gpio() - restore gpio chip data after suspend
d87964c4 BD	359	* @ourchip: The suspended chip.
d87964c4 BD	360	*/
782d8a3c	361	static void samsung_pm_resume_gpio(struct samsung_gpio_chip *ourchip)
d87964c4	362	{
782d8a3c	363	struct samsung_gpio_pm *pm = ourchip->pm;
d87964c4 BD	364
	365	if (pm == NULL \|\| pm->resume == NULL)
	366	S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
	367	else
	368	pm->resume(ourchip);
	369	}
	370
782d8a3c	371	void samsung_pm_restore_gpios(void)
d87964c4	372	{
782d8a3c	373	struct samsung_gpio_chip *ourchip;
d87964c4 BD	374	unsigned int gpio_nr;
d87964c4 BD	375
32b6cb38	376	for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
782d8a3c	377	ourchip = samsung_gpiolib_getchip(gpio_nr);
91dc74e4 P	378	if (!ourchip) {
91dc74e4 P	379	gpio_nr++;
d87964c4	380	continue;
91dc74e4	381	}
d87964c4	382
782d8a3c	383	samsung_pm_resume_gpio(ourchip);
d87964c4 BD	384
	385	gpio_nr += ourchip->chip.ngpio;
	386	gpio_nr += CONFIG_S3C_GPIO_SPACE;
	387	}
	388	}