[mirror_ubuntu-artful-kernel.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 <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(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) {
		/* 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 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>
1da177e4	17
a09e64fb	18	#include <mach/pm.h>
1da177e4	19
711be5cc EM	20	struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
711be5cc EM	21	static unsigned long *sleep_save;
1da177e4	22
756c7b74	23	int pxa_pm_enter(suspend_state_t state)
1da177e4	24	{
711be5cc	25	unsigned long sleep_save_checksum = 0, checksum = 0;
1da177e4	26	int i;
1da177e4 LT	27
	28	#ifdef CONFIG_IWMMXT
	29	/* force any iWMMXt context to ram **/
afe4b25e LB	30	if (elf_hwcap & HWCAP_IWMMXT)
afe4b25e LB	31	iwmmxt_task_disable(NULL);
1da177e4 LT	32	#endif
1da177e4 LT	33
512f03fd	34	/* skip registers saving for standby */
	35	if (state != PM_SUSPEND_STANDBY) {
	36	pxa_cpu_pm_fns->save(sleep_save);
	37	/* before sleeping, calculate and save a checksum */
649de51b	38	for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
512f03fd	39	sleep_save_checksum += sleep_save[i];
512f03fd	40	}
1da177e4	41
1da177e4	42	/* * go zzz * */
711be5cc	43	pxa_cpu_pm_fns->enter(state);
36c5ed23 RK	44	cpu_init();
36c5ed23 RK	45
512f03fd	46	if (state != PM_SUSPEND_STANDBY) {
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
1da177e4 LT	69	unsigned long sleep_phys_sp(void *sp)
	70	{
	71	return virt_to_phys(sp);
	72	}
711be5cc EM	73
	74	static int pxa_pm_valid(suspend_state_t state)
	75	{
	76	if (pxa_cpu_pm_fns)
	77	return pxa_cpu_pm_fns->valid(state);
	78
	79	return -EINVAL;
	80	}
	81
51cdd928	82	int pxa_pm_prepare(void)
4104980a RK	83	{
	84	int ret = 0;
	85
	86	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
	87	ret = pxa_cpu_pm_fns->prepare();
	88
	89	return ret;
	90	}
	91
51cdd928	92	void pxa_pm_finish(void)
4104980a RK	93	{
	94	if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
	95	pxa_cpu_pm_fns->finish();
	96	}
	97
26398a70	98	static struct platform_suspend_ops pxa_pm_ops = {
711be5cc EM	99	.valid = pxa_pm_valid,
711be5cc EM	100	.enter = pxa_pm_enter,
4104980a RK	101	.prepare = pxa_pm_prepare,
4104980a RK	102	.finish = pxa_pm_finish,
711be5cc EM	103	};
	104
	105	static int __init pxa_pm_init(void)
	106	{
	107	if (!pxa_cpu_pm_fns) {
	108	printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
	109	return -EINVAL;
	110	}
	111
649de51b RJ	112	sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
649de51b RJ	113	GFP_KERNEL);
711be5cc EM	114	if (!sleep_save) {
	115	printk(KERN_ERR "failed to alloc memory for pm save\n");
	116	return -ENOMEM;
	117	}
	118
26398a70	119	suspend_set_ops(&pxa_pm_ops);
711be5cc EM	120	return 0;
	121	}
	122
	123	device_initcall(pxa_pm_init);