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); 112