4104980a3c
Currently, we set PSPR just before entering sleep mode. However, some platforms have different requirements for setting PSPR in order to properly wake up. Set PSPR earlier in the suspend cycle so that platforms can change the setting by using a sysdev driver instead. Acked-by: Eric Miao <eric.miao@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
130 lines
2.8 KiB
C
130 lines
2.8 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/time.h>
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#include <mach/hardware.h>
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#include <asm/memory.h>
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#include <asm/system.h>
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#include <mach/pm.h>
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#include <mach/pxa-regs.h>
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#include <mach/lubbock.h>
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#include <asm/mach/time.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) {
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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) {
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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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#ifdef CONFIG_ARCH_LUBBOCK
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LUB_HEXLED = 0xbadbadc5;
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#endif
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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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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 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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static 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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static 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 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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