Tony Lindgren | 670c104 | 2006-04-02 17:46:25 +0100 | [diff] [blame] | 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/pm.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/proc_fs.h> |
| 22 | #include <linux/pm.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/sysfs.h> |
| 25 | #include <linux/module.h> |
| 26 | |
| 27 | #include <asm/io.h> |
| 28 | #include <asm/irq.h> |
| 29 | #include <asm/atomic.h> |
| 30 | #include <asm/mach/time.h> |
| 31 | #include <asm/mach/irq.h> |
| 32 | #include <asm/mach-types.h> |
| 33 | |
| 34 | #include <asm/arch/irqs.h> |
| 35 | #include <asm/arch/clock.h> |
| 36 | #include <asm/arch/sram.h> |
| 37 | #include <asm/arch/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 | void omap2_pm_idle(void) |
| 45 | { |
| 46 | local_irq_disable(); |
| 47 | local_fiq_disable(); |
| 48 | if (need_resched()) { |
| 49 | local_fiq_enable(); |
| 50 | local_irq_enable(); |
| 51 | return; |
| 52 | } |
| 53 | |
| 54 | /* |
| 55 | * Since an interrupt may set up a timer, we don't want to |
| 56 | * reprogram the hardware timer with interrupts enabled. |
| 57 | * Re-enable interrupts only after returning from idle. |
| 58 | */ |
| 59 | timer_dyn_reprogram(); |
| 60 | |
| 61 | omap2_sram_idle(); |
| 62 | local_fiq_enable(); |
| 63 | local_irq_enable(); |
| 64 | } |
| 65 | |
| 66 | static int omap2_pm_prepare(suspend_state_t state) |
| 67 | { |
| 68 | int error = 0; |
| 69 | |
| 70 | /* We cannot sleep in idle until we have resumed */ |
| 71 | saved_idle = pm_idle; |
| 72 | pm_idle = NULL; |
| 73 | |
| 74 | switch (state) |
| 75 | { |
| 76 | case PM_SUSPEND_STANDBY: |
| 77 | case PM_SUSPEND_MEM: |
| 78 | break; |
| 79 | |
| 80 | case PM_SUSPEND_DISK: |
| 81 | return -ENOTSUPP; |
| 82 | |
| 83 | default: |
| 84 | return -EINVAL; |
| 85 | } |
| 86 | |
| 87 | return error; |
| 88 | } |
| 89 | |
| 90 | static int omap2_pm_enter(suspend_state_t state) |
| 91 | { |
| 92 | switch (state) |
| 93 | { |
| 94 | case PM_SUSPEND_STANDBY: |
| 95 | case PM_SUSPEND_MEM: |
| 96 | /* FIXME: Add suspend */ |
| 97 | break; |
| 98 | |
| 99 | case PM_SUSPEND_DISK: |
| 100 | return -ENOTSUPP; |
| 101 | |
| 102 | default: |
| 103 | return -EINVAL; |
| 104 | } |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static int omap2_pm_finish(suspend_state_t state) |
| 110 | { |
| 111 | pm_idle = saved_idle; |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static struct pm_ops omap_pm_ops = { |
| 116 | .pm_disk_mode = 0, |
| 117 | .prepare = omap2_pm_prepare, |
| 118 | .enter = omap2_pm_enter, |
| 119 | .finish = omap2_pm_finish, |
| 120 | }; |
| 121 | |
| 122 | int __init omap2_pm_init(void) |
| 123 | { |
| 124 | printk("Power Management for TI OMAP.\n"); |
| 125 | |
| 126 | vclk = clk_get(NULL, "virt_prcm_set"); |
| 127 | if (IS_ERR(vclk)) { |
| 128 | printk(KERN_ERR "Could not get PM vclk\n"); |
| 129 | return -ENODEV; |
| 130 | } |
| 131 | |
| 132 | /* |
| 133 | * We copy the assembler sleep/wakeup routines to SRAM. |
| 134 | * These routines need to be in SRAM as that's the only |
| 135 | * memory the MPU can see when it wakes up. |
| 136 | */ |
| 137 | omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend, |
| 138 | omap24xx_idle_loop_suspend_sz); |
| 139 | |
| 140 | omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend, |
| 141 | omap24xx_cpu_suspend_sz); |
| 142 | |
| 143 | pm_set_ops(&omap_pm_ops); |
| 144 | pm_idle = omap2_pm_idle; |
| 145 | |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | __initcall(omap2_pm_init); |