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

/*
 * PXA250/210 Power Management Routines
 *
 * Original code for the SA11x0:
 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
 *
 * Modified for the PXA250 by Nicolas Pitre:
 * Copyright (c) 2002 Monta Vista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/slab.h>

#include <mach/pm.h>

struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
static unsigned long *sleep_save;

int pxa_pm_enter(suspend_state_t state)
{
	unsigned long sleep_save_checksum = 0, checksum = 0;
	int i;

#ifdef CONFIG_IWMMXT
	/* force any iWMMXt context to ram **/
	if (elf_hwcap & HWCAP_IWMMXT)
		iwmmxt_task_disable(NULL);
#endif

	/* skip registers saving for standby */
	if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
		pxa_cpu_pm_fns->save(sleep_save);
		/* before sleeping, calculate and save a checksum */
		for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
			sleep_save_checksum += sleep_save[i];
	}

	/* *** go zzz *** */
	pxa_cpu_pm_fns->enter(state);
	cpu_init();

	if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
		/* after sleeping, validate the checksum */
		for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
			checksum += sleep_save[i];

		/* if invalid, display message and wait for a hardware reset */
		if (checksum != sleep_save_checksum) {

			lubbock_set_hexled(0xbadbadc5);

			while (1)
				pxa_cpu_pm_fns->enter(state);
		}
		pxa_cpu_pm_fns->restore(sleep_save);
	}

	pr_debug("*** made it back from resume\n");

	return 0;
}

EXPORT_SYMBOL_GPL(pxa_pm_enter);

unsigned long sleep_phys_sp(void *sp)
{
	return virt_to_phys(sp);
}

static int pxa_pm_valid(suspend_state_t state)
{
	if (pxa_cpu_pm_fns)
		return pxa_cpu_pm_fns->valid(state);

	return -EINVAL;
}

int pxa_pm_prepare(void)
{
	int ret = 0;

	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
		ret = pxa_cpu_pm_fns->prepare();

	return ret;
}

void pxa_pm_finish(void)
{
	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
		pxa_cpu_pm_fns->finish();
}

static const struct platform_suspend_ops pxa_pm_ops = {
	.valid		= pxa_pm_valid,
	.enter		= pxa_pm_enter,
	.prepare	= pxa_pm_prepare,
	.finish		= pxa_pm_finish,
};

static int __init pxa_pm_init(void)
{
	if (!pxa_cpu_pm_fns) {
		printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
		return -EINVAL;
	}

	sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
			     GFP_KERNEL);
	if (!sleep_save) {
		printk(KERN_ERR "failed to alloc memory for pm save\n");
		return -ENOMEM;
	}

	suspend_set_ops(&pxa_pm_ops);
	return 0;
}

device_initcall(pxa_pm_init);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* PXA250/210 Power Management Routines
	3	*
	4	* Original code for the SA11x0:
	5	* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
	6	*
	7	* Modified for the PXA250 by Nicolas Pitre:
	8	* Copyright (c) 2002 Monta Vista Software, Inc.
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License.
	12	*/
1da177e4	13	#include <linux/init.h>
756c7b74	14	#include <linux/module.h>
1da177e4 LT	15	#include <linux/suspend.h>
1da177e4 LT	16	#include <linux/errno.h>
5a0e3ad6	17	#include <linux/slab.h>
1da177e4	18
a09e64fb	19	#include <mach/pm.h>
1da177e4	20
711be5cc EM	21	struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
711be5cc EM	22	static unsigned long *sleep_save;
1da177e4	23
756c7b74	24	int pxa_pm_enter(suspend_state_t state)
1da177e4	25	{
711be5cc	26	unsigned long sleep_save_checksum = 0, checksum = 0;
1da177e4	27	int i;
1da177e4 LT	28
	29	#ifdef CONFIG_IWMMXT
	30	/* force any iWMMXt context to ram **/
afe4b25e LB	31	if (elf_hwcap & HWCAP_IWMMXT)
afe4b25e LB	32	iwmmxt_task_disable(NULL);
1da177e4 LT	33	#endif
1da177e4 LT	34
512f03fd	35	/* skip registers saving for standby */
3d9cb0ea	36	if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
512f03fd	37	pxa_cpu_pm_fns->save(sleep_save);
512f03fd	38	/* before sleeping, calculate and save a checksum */
649de51b	39	for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
512f03fd	40	sleep_save_checksum += sleep_save[i];
512f03fd	41	}
1da177e4	42
1da177e4	43	/* * go zzz * */
711be5cc	44	pxa_cpu_pm_fns->enter(state);
36c5ed23 RK	45	cpu_init();
36c5ed23 RK	46
3d9cb0ea	47	if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
512f03fd	48	/* after sleeping, validate the checksum */
649de51b	49	for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
512f03fd	50	checksum += sleep_save[i];
1da177e4	51
512f03fd	52	/* if invalid, display message and wait for a hardware reset */
512f03fd	53	if (checksum != sleep_save_checksum) {
54386145 EM	54
	55	lubbock_set_hexled(0xbadbadc5);
	56
512f03fd	57	while (1)
	58	pxa_cpu_pm_fns->enter(state);
	59	}
	60	pxa_cpu_pm_fns->restore(sleep_save);
1da177e4 LT	61	}
1da177e4 LT	62
711be5cc	63	pr_debug("*** made it back from resume\n");
1da177e4 LT	64
	65	return 0;
	66	}
	67
756c7b74 RP	68	EXPORT_SYMBOL_GPL(pxa_pm_enter);
756c7b74 RP	69
1da177e4 LT	70	unsigned long sleep_phys_sp(void *sp)
	71	{
	72	return virt_to_phys(sp);
	73	}
711be5cc EM	74
	75	static int pxa_pm_valid(suspend_state_t state)
	76	{
	77	if (pxa_cpu_pm_fns)
	78	return pxa_cpu_pm_fns->valid(state);
	79
	80	return -EINVAL;
	81	}
	82
51cdd928	83	int pxa_pm_prepare(void)
4104980a RK	84	{
	85	int ret = 0;
	86
	87	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
	88	ret = pxa_cpu_pm_fns->prepare();
	89
	90	return ret;
	91	}
	92
51cdd928	93	void pxa_pm_finish(void)
4104980a RK	94	{
	95	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
	96	pxa_cpu_pm_fns->finish();
	97	}
	98
2f55ac07	99	static const struct platform_suspend_ops pxa_pm_ops = {
711be5cc EM	100	.valid = pxa_pm_valid,
711be5cc EM	101	.enter = pxa_pm_enter,
4104980a RK	102	.prepare = pxa_pm_prepare,
4104980a RK	103	.finish = pxa_pm_finish,
711be5cc EM	104	};
	105
	106	static int __init pxa_pm_init(void)
	107	{
	108	if (!pxa_cpu_pm_fns) {
	109	printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
	110	return -EINVAL;
	111	}
	112
649de51b RJ	113	sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
649de51b RJ	114	GFP_KERNEL);
711be5cc EM	115	if (!sleep_save) {
	116	printk(KERN_ERR "failed to alloc memory for pm save\n");
	117	return -ENOMEM;
	118	}
	119
26398a70	120	suspend_set_ops(&pxa_pm_ops);
711be5cc EM	121	return 0;
	122	}
	123
	124	device_initcall(pxa_pm_init);