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