124 lines
2.7 KiB
C
124 lines
2.7 KiB
C
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/*
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* linux/arch/unicore32/kernel/pm.c
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*
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* Code specific to PKUnity SoC and UniCore ISA
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*
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* Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
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* Copyright (C) 2001-2010 Guan Xuetao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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 <linux/io.h>
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#include <mach/hardware.h>
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#include <mach/pm.h>
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#include "setup.h"
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struct puv3_cpu_pm_fns *puv3_cpu_pm_fns;
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static unsigned long *sleep_save;
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int puv3_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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/* skip registers saving for standby */
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if (state != PM_SUSPEND_STANDBY) {
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puv3_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 < puv3_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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puv3_cpu_pm_fns->enter(state);
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cpu_init();
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#ifdef CONFIG_INPUT_KEYBOARD
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puv3_ps2_init();
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#endif
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#ifdef CONFIG_PCI
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pci_puv3_preinit();
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#endif
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if (state != PM_SUSPEND_STANDBY) {
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/* after sleeping, validate the checksum */
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for (i = 0; i < puv3_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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while (1)
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puv3_cpu_pm_fns->enter(state);
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}
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puv3_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(puv3_pm_enter);
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unsigned long sleep_phys_sp(void *sp)
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{
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return virt_to_phys(sp);
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}
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static int puv3_pm_valid(suspend_state_t state)
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{
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if (puv3_cpu_pm_fns)
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return puv3_cpu_pm_fns->valid(state);
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return -EINVAL;
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}
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static int puv3_pm_prepare(void)
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{
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int ret = 0;
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if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->prepare)
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ret = puv3_cpu_pm_fns->prepare();
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return ret;
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}
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static void puv3_pm_finish(void)
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{
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if (puv3_cpu_pm_fns && puv3_cpu_pm_fns->finish)
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puv3_cpu_pm_fns->finish();
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}
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static struct platform_suspend_ops puv3_pm_ops = {
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.valid = puv3_pm_valid,
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.enter = puv3_pm_enter,
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.prepare = puv3_pm_prepare,
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.finish = puv3_pm_finish,
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};
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static int __init puv3_pm_init(void)
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{
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if (!puv3_cpu_pm_fns) {
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printk(KERN_ERR "no valid puv3_cpu_pm_fns defined\n");
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return -EINVAL;
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}
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sleep_save = kmalloc(puv3_cpu_pm_fns->save_count
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* sizeof(unsigned long), 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(&puv3_pm_ops);
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return 0;
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}
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device_initcall(puv3_pm_init);
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