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/*
* linux/arch/arm/mach-omap2/pm.c
*
* OMAP2 Power Management Routines
*
* Copyright (C) 2006 Nokia Corporation
* Tony Lindgren <tony@atomide.com>
*
* Copyright (C) 2005 Texas Instruments, Inc.
* Richard Woodruff <r-woodruff2@ti.com>
*
* Based on pm.c for omap1
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/pm.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/pm.h>
#include <linux/interrupt.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/atomic.h>
#include <asm/mach/time.h>
#include <asm/mach/irq.h>
#include <asm/mach-types.h>
#include <asm/arch/irqs.h>
#include <asm/arch/clock.h>
#include <asm/arch/sram.h>
#include <asm/arch/pm.h>
static struct clk *vclk;
static void (*omap2_sram_idle)(void);
static void (*omap2_sram_suspend)(int dllctrl, int cpu_rev);
static void (*saved_idle)(void);
void omap2_pm_idle(void)
{
local_irq_disable();
local_fiq_disable();
if (need_resched()) {
local_fiq_enable();
local_irq_enable();
return;
}
/*
* Since an interrupt may set up a timer, we don't want to
* reprogram the hardware timer with interrupts enabled.
* Re-enable interrupts only after returning from idle.
*/
timer_dyn_reprogram();
omap2_sram_idle();
local_fiq_enable();
local_irq_enable();
}
static int omap2_pm_prepare(suspend_state_t state)
{
int error = 0;
/* We cannot sleep in idle until we have resumed */
saved_idle = pm_idle;
pm_idle = NULL;
switch (state)
{
case PM_SUSPEND_STANDBY:
case PM_SUSPEND_MEM:
break;
case PM_SUSPEND_DISK:
return -ENOTSUPP;
default:
return -EINVAL;
}
return error;
}
static int omap2_pm_enter(suspend_state_t state)
{
switch (state)
{
case PM_SUSPEND_STANDBY:
case PM_SUSPEND_MEM:
/* FIXME: Add suspend */
break;
case PM_SUSPEND_DISK:
return -ENOTSUPP;
default:
return -EINVAL;
}
return 0;
}
static int omap2_pm_finish(suspend_state_t state)
{
pm_idle = saved_idle;
return 0;
}
static struct pm_ops omap_pm_ops = {
.pm_disk_mode = 0,
.prepare = omap2_pm_prepare,
.enter = omap2_pm_enter,
.finish = omap2_pm_finish,
};
int __init omap2_pm_init(void)
{
printk("Power Management for TI OMAP.\n");
vclk = clk_get(NULL, "virt_prcm_set");
if (IS_ERR(vclk)) {
printk(KERN_ERR "Could not get PM vclk\n");
return -ENODEV;
}
/*
* We copy the assembler sleep/wakeup routines to SRAM.
* These routines need to be in SRAM as that's the only
* memory the MPU can see when it wakes up.
*/
omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend,
omap24xx_idle_loop_suspend_sz);
omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
omap24xx_cpu_suspend_sz);
pm_set_ops(&omap_pm_ops);
pm_idle = omap2_pm_idle;
return 0;
}
__initcall(omap2_pm_init);
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