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

/*
 * PXA250/210 Power Management Routines
 *
 * Original code for the SA11x0:
 * Copyright (c) 2001 Cliff Brake <[email protected]>
 *
 * 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);

	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);

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 <[email protected]>
	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	45
3d9cb0ea	46	if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
512f03fd	47	/* after sleeping, validate the checksum */
649de51b	48	for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
512f03fd	49	checksum += sleep_save[i];
1da177e4	50
512f03fd	51	/* if invalid, display message and wait for a hardware reset */
512f03fd	52	if (checksum != sleep_save_checksum) {
54386145 EM	53
	54	lubbock_set_hexled(0xbadbadc5);
	55
512f03fd	56	while (1)
	57	pxa_cpu_pm_fns->enter(state);
	58	}
	59	pxa_cpu_pm_fns->restore(sleep_save);
1da177e4 LT	60	}
1da177e4 LT	61
711be5cc	62	pr_debug("*** made it back from resume\n");
1da177e4 LT	63
	64	return 0;
	65	}
	66
756c7b74 RP	67	EXPORT_SYMBOL_GPL(pxa_pm_enter);
756c7b74 RP	68
711be5cc EM	69	static int pxa_pm_valid(suspend_state_t state)
	70	{
	71	if (pxa_cpu_pm_fns)
	72	return pxa_cpu_pm_fns->valid(state);
	73
	74	return -EINVAL;
	75	}
	76
51cdd928	77	int pxa_pm_prepare(void)
4104980a RK	78	{
	79	int ret = 0;
	80
	81	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
	82	ret = pxa_cpu_pm_fns->prepare();
	83
	84	return ret;
	85	}
	86
51cdd928	87	void pxa_pm_finish(void)
4104980a RK	88	{
	89	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
	90	pxa_cpu_pm_fns->finish();
	91	}
	92
2f55ac07	93	static const struct platform_suspend_ops pxa_pm_ops = {
711be5cc EM	94	.valid = pxa_pm_valid,
711be5cc EM	95	.enter = pxa_pm_enter,
4104980a RK	96	.prepare = pxa_pm_prepare,
4104980a RK	97	.finish = pxa_pm_finish,
711be5cc EM	98	};
	99
	100	static int __init pxa_pm_init(void)
	101	{
	102	if (!pxa_cpu_pm_fns) {
	103	printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
	104	return -EINVAL;
	105	}
	106
649de51b RJ	107	sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
649de51b RJ	108	GFP_KERNEL);
711be5cc EM	109	if (!sleep_save) {
	110	printk(KERN_ERR "failed to alloc memory for pm save\n");
	111	return -ENOMEM;
	112	}
	113
26398a70	114	suspend_set_ops(&pxa_pm_ops);
711be5cc EM	115	return 0;
	116	}
	117
	118	device_initcall(pxa_pm_init);