mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
/*
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* PXA250/210 Power Management Routines
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*
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* Original code for the SA11x0:
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* Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
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*
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* Modified for the PXA250 by Nicolas Pitre:
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* Copyright (c) 2002 Monta Vista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/suspend.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <mach/pm.h>
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struct pxa_cpu_pm_fns *pxa_cpu_pm_fns;
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static unsigned long *sleep_save;
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int pxa_pm_enter(suspend_state_t state)
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{
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unsigned long sleep_save_checksum = 0, checksum = 0;
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int i;
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#ifdef CONFIG_IWMMXT
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/* force any iWMMXt context to ram **/
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if (elf_hwcap & HWCAP_IWMMXT)
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iwmmxt_task_disable(NULL);
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#endif
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/* skip registers saving for standby */
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if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->save) {
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pxa_cpu_pm_fns->save(sleep_save);
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/* before sleeping, calculate and save a checksum */
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for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
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sleep_save_checksum += sleep_save[i];
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}
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/* *** go zzz *** */
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pxa_cpu_pm_fns->enter(state);
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cpu_init();
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if (state != PM_SUSPEND_STANDBY && pxa_cpu_pm_fns->restore) {
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/* after sleeping, validate the checksum */
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for (i = 0; i < pxa_cpu_pm_fns->save_count - 1; i++)
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checksum += sleep_save[i];
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/* if invalid, display message and wait for a hardware reset */
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if (checksum != sleep_save_checksum) {
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lubbock_set_hexled(0xbadbadc5);
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while (1)
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pxa_cpu_pm_fns->enter(state);
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}
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pxa_cpu_pm_fns->restore(sleep_save);
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}
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pr_debug("*** made it back from resume\n");
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return 0;
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}
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EXPORT_SYMBOL_GPL(pxa_pm_enter);
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static int pxa_pm_valid(suspend_state_t state)
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{
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if (pxa_cpu_pm_fns)
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return pxa_cpu_pm_fns->valid(state);
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return -EINVAL;
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}
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int pxa_pm_prepare(void)
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{
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int ret = 0;
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if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->prepare)
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ret = pxa_cpu_pm_fns->prepare();
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return ret;
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}
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void pxa_pm_finish(void)
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{
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if (pxa_cpu_pm_fns && pxa_cpu_pm_fns->finish)
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pxa_cpu_pm_fns->finish();
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}
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static const struct platform_suspend_ops pxa_pm_ops = {
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.valid = pxa_pm_valid,
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.enter = pxa_pm_enter,
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.prepare = pxa_pm_prepare,
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.finish = pxa_pm_finish,
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};
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static int __init pxa_pm_init(void)
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{
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if (!pxa_cpu_pm_fns) {
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printk(KERN_ERR "no valid pxa_cpu_pm_fns defined\n");
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return -EINVAL;
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}
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sleep_save = kmalloc(pxa_cpu_pm_fns->save_count * sizeof(unsigned long),
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GFP_KERNEL);
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if (!sleep_save) {
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printk(KERN_ERR "failed to alloc memory for pm save\n");
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return -ENOMEM;
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}
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suspend_set_ops(&pxa_pm_ops);
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return 0;
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}
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device_initcall(pxa_pm_init);
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