[deliverable/linux.git] / arch / arm / mach-sa1100 / pm.c

/*
 * SA1100 Power Management Routines
 *
 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 *
 * History:
 *
 * 2001-02-06:	Cliff Brake         Initial code
 *
 * 2001-02-25:	Sukjae Cho <sjcho@east.isi.edu> &
 * 		Chester Kuo <chester@linux.org.tw>
 * 			Save more value for the resume function! Support
 * 			Bitsy/Assabet/Freebird board
 *
 * 2001-08-29:	Nicolas Pitre <nico@fluxnic.net>
 * 			Cleaned up, pushed platform dependent stuff
 * 			in the platform specific files.
 *
 * 2002-05-27:	Nicolas Pitre	Killed sleep.h and the kmalloced save array.
 * 				Storage is local on the stack now.
 */
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/time.h>

#include <mach/hardware.h>
#include <asm/memory.h>
#include <asm/system.h>
#include <asm/mach/time.h>

extern void sa1100_finish_suspend(unsigned long);

#define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x)	x = sleep_save[SLEEP_SAVE_##x]

/*
 * List of global SA11x0 peripheral registers to preserve.
 * More ones like CP and general purpose register values are preserved
 * on the stack and then the stack pointer is stored last in sleep.S.
 */
enum {	SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
	SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,

	SLEEP_SAVE_Ser1SDCR0,

	SLEEP_SAVE_COUNT
};


static int sa11x0_pm_enter(suspend_state_t state)
{
	unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT];

	gpio = GPLR;

	/* save vital registers */
	SAVE(GPDR);
	SAVE(GAFR);

	SAVE(PPDR);
	SAVE(PPSR);
	SAVE(PPAR);
	SAVE(PSDR);

	SAVE(Ser1SDCR0);

	/* Clear previous reset status */
	RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;

	/* set resume return address */
	PSPR = virt_to_phys(cpu_resume);

	/* go zzz */
	cpu_suspend(0, PHYS_OFFSET - PAGE_OFFSET, 0, sa1100_finish_suspend);

	/*
	 * Ensure not to come back here if it wasn't intended
	 */
	PSPR = 0;

	/*
	 * Ensure interrupt sources are disabled; we will re-init
	 * the interrupt subsystem via the device manager.
	 */
	ICLR = 0;
	ICCR = 1;
	ICMR = 0;

	/* restore registers */
	RESTORE(GPDR);
	RESTORE(GAFR);

	RESTORE(PPDR);
	RESTORE(PPSR);
	RESTORE(PPAR);
	RESTORE(PSDR);

	RESTORE(Ser1SDCR0);

	GPSR = gpio;
	GPCR = ~gpio;

	/*
	 * Clear the peripheral sleep-hold bit.
	 */
	PSSR = PSSR_PH;

	return 0;
}

static const struct platform_suspend_ops sa11x0_pm_ops = {
	.enter		= sa11x0_pm_enter,
	.valid		= suspend_valid_only_mem,
};

static int __init sa11x0_pm_init(void)
{
	suspend_set_ops(&sa11x0_pm_ops);
	return 0;
}

late_initcall(sa11x0_pm_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* SA1100 Power Management Routines
	3	*
	4	* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License.
	8	*
	9	* History:
	10	*
	11	* 2001-02-06: Cliff Brake Initial code
	12	*
	13	* 2001-02-25: Sukjae Cho <sjcho@east.isi.edu> &
	14	* Chester Kuo <chester@linux.org.tw>
	15	* Save more value for the resume function! Support
	16	* Bitsy/Assabet/Freebird board
	17	*
2f82af08	18	* 2001-08-29: Nicolas Pitre <nico@fluxnic.net>
1da177e4 LT	19	* Cleaned up, pushed platform dependent stuff
	20	* in the platform specific files.
	21	*
	22	* 2002-05-27: Nicolas Pitre Killed sleep.h and the kmalloced save array.
	23	* Storage is local on the stack now.
	24	*/
	25	#include <linux/init.h>
	26	#include <linux/suspend.h>
	27	#include <linux/errno.h>
	28	#include <linux/time.h>
	29
a09e64fb	30	#include <mach/hardware.h>
1da177e4 LT	31	#include <asm/memory.h>
	32	#include <asm/system.h>
	33	#include <asm/mach/time.h>
	34
34c79de6	35	extern void sa1100_finish_suspend(unsigned long);
1da177e4 LT	36
	37	#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
	38	#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
	39
	40	/*
	41	* List of global SA11x0 peripheral registers to preserve.
	42	* More ones like CP and general purpose register values are preserved
	43	* on the stack and then the stack pointer is stored last in sleep.S.
	44	*/
649de51b	45	enum { SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
1da177e4 LT	46	SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
	47
	48	SLEEP_SAVE_Ser1SDCR0,
	49
649de51b	50	SLEEP_SAVE_COUNT
1da177e4 LT	51	};
	52
	53
	54	static int sa11x0_pm_enter(suspend_state_t state)
	55	{
649de51b	56	unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT];
1da177e4	57
1da177e4 LT	58	gpio = GPLR;
	59
	60	/* save vital registers */
	61	SAVE(GPDR);
	62	SAVE(GAFR);
	63
	64	SAVE(PPDR);
	65	SAVE(PPSR);
	66	SAVE(PPAR);
	67	SAVE(PSDR);
	68
	69	SAVE(Ser1SDCR0);
	70
	71	/* Clear previous reset status */
	72	RCSR = RCSR_HWR \| RCSR_SWR \| RCSR_WDR \| RCSR_SMR;
	73
	74	/* set resume return address */
96c20015	75	PSPR = virt_to_phys(cpu_resume);
1da177e4 LT	76
1da177e4 LT	77	/* go zzz */
34c79de6	78	cpu_suspend(0, PHYS_OFFSET - PAGE_OFFSET, 0, sa1100_finish_suspend);
1da177e4 LT	79
	80	/*
	81	* Ensure not to come back here if it wasn't intended
	82	*/
	83	PSPR = 0;
	84
	85	/*
	86	* Ensure interrupt sources are disabled; we will re-init
	87	* the interrupt subsystem via the device manager.
	88	*/
	89	ICLR = 0;
	90	ICCR = 1;
	91	ICMR = 0;
	92
	93	/* restore registers */
	94	RESTORE(GPDR);
	95	RESTORE(GAFR);
	96
	97	RESTORE(PPDR);
	98	RESTORE(PPSR);
	99	RESTORE(PPAR);
	100	RESTORE(PSDR);
	101
	102	RESTORE(Ser1SDCR0);
	103
	104	GPSR = gpio;
	105	GPCR = ~gpio;
	106
	107	/*
	108	* Clear the peripheral sleep-hold bit.
	109	*/
	110	PSSR = PSSR_PH;
	111
1da177e4 LT	112	return 0;
	113	}
	114
2f55ac07	115	static const struct platform_suspend_ops sa11x0_pm_ops = {
1da177e4	116	.enter = sa11x0_pm_enter,
26398a70	117	.valid = suspend_valid_only_mem,
1da177e4 LT	118	};
	119
	120	static int __init sa11x0_pm_init(void)
	121	{
26398a70	122	suspend_set_ops(&sa11x0_pm_ops);
1da177e4 LT	123	return 0;
	124	}
	125
	126	late_initcall(sa11x0_pm_init);