arch/arm/mach-omap2/pm.c

   1 /*
   2  * linux/arch/arm/mach-omap2/pm.c
   3  *
   4  * OMAP2 Power Management Routines
   5  *
   6  * Copyright (C) 2006 Nokia Corporation
   7  * Tony Lindgren <tony@atomide.com>
   8  *
   9  * Copyright (C) 2005 Texas Instruments, Inc.
  10  * Richard Woodruff <r-woodruff2@ti.com>
  11  *
  12  * Based on pm.c for omap1
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/suspend.h>
  20 #include <linux/sched.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/sysfs.h>
  24 #include <linux/module.h>
  25 #include <linux/delay.h>
  26 #include <linux/clk.h>
  27 #include <linux/io.h>
  28
  29 #include <asm/irq.h>
  30 #include <asm/atomic.h>
  31 #include <asm/mach/time.h>
  32 #include <asm/mach/irq.h>
  33
  34 #include <mach/irqs.h>
  35 #include <mach/clock.h>
  36 #include <mach/sram.h>
  37 #include <mach/pm.h>
  38
  39 static struct clk *vclk;
  40 static void (*omap2_sram_idle)(void);
  41 static void (*omap2_sram_suspend)(int dllctrl, int cpu_rev);
  42 static void (*saved_idle)(void);
  43
  44 extern void __init pmdomain_init(void);
  45 extern void pmdomain_set_autoidle(void);
  46
  47 static unsigned int omap24xx_sleep_save[OMAP24XX_SLEEP_SAVE_SIZE];
  48
  49 void omap2_pm_idle(void)
  50 {
  51         local_irq_disable();
  52         local_fiq_disable();
  53         if (need_resched()) {
  54                 local_fiq_enable();
  55                 local_irq_enable();
  56                 return;
  57         }
  58
  59         omap2_sram_idle();
  60         local_fiq_enable();
  61         local_irq_enable();
  62 }
  63
  64 static int omap2_pm_prepare(void)
  65 {
  66         /* We cannot sleep in idle until we have resumed */
  67         saved_idle = pm_idle;
  68         pm_idle = NULL;
  69         return 0;
  70 }
  71
  72 static int omap2_pm_suspend(void)
  73 {
  74         return 0;
  75 }
  76
  77 static int omap2_pm_enter(suspend_state_t state)
  78 {
  79         int ret = 0;
  80
  81         switch (state)
  82         {
  83         case PM_SUSPEND_STANDBY:
  84         case PM_SUSPEND_MEM:
  85                 ret = omap2_pm_suspend();
  86                 break;
  87         default:
  88                 ret = -EINVAL;
  89         }
  90
  91         return ret;
  92 }
  93
  94 static void omap2_pm_finish(void)
  95 {
  96         pm_idle = saved_idle;
  97 }
  98
  99 static struct platform_suspend_ops omap_pm_ops = {
 100         .prepare        = omap2_pm_prepare,
 101         .enter          = omap2_pm_enter,
 102         .finish         = omap2_pm_finish,
 103         .valid          = suspend_valid_only_mem,
 104 };
 105
 106 int __init omap2_pm_init(void)
 107 {
 108         return 0;
 109 }
 110
 111 __initcall(omap2_pm_init);