1/* 2 * sleep.c - ACPI sleep support. 3 * 4 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> 5 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> 6 * Copyright (c) 2000-2003 Patrick Mochel 7 * Copyright (c) 2003 Open Source Development Lab 8 * 9 * This file is released under the GPLv2. 10 * 11 */ 12 13#include <linux/delay.h> 14#include <linux/irq.h> 15#include <linux/dmi.h> 16#include <linux/device.h> 17#include <linux/suspend.h> 18#include <acpi/acpi_bus.h> 19#include <acpi/acpi_drivers.h> 20#include "sleep.h" 21 22u8 sleep_states[ACPI_S_STATE_COUNT]; 23 24static struct pm_ops acpi_pm_ops; 25 26extern void do_suspend_lowlevel(void); 27 28static u32 acpi_suspend_states[] = { 29 [PM_SUSPEND_ON] = ACPI_STATE_S0, 30 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, 31 [PM_SUSPEND_MEM] = ACPI_STATE_S3, 32 [PM_SUSPEND_MAX] = ACPI_STATE_S5 33}; 34 35static int init_8259A_after_S1; 36 37/** 38 * acpi_pm_prepare - Do preliminary suspend work. 39 * @pm_state: suspend state we're entering. 40 * 41 * Make sure we support the state. If we do, and we need it, set the 42 * firmware waking vector and do arch-specific nastiness to get the 43 * wakeup code to the waking vector. 44 */ 45 46extern int acpi_sleep_prepare(u32 acpi_state); 47extern void acpi_power_off(void); 48 49static int acpi_pm_prepare(suspend_state_t pm_state) 50{ 51 u32 acpi_state = acpi_suspend_states[pm_state]; 52 53 if (!sleep_states[acpi_state]) { 54 printk("acpi_pm_prepare does not support %d \n", pm_state); 55 return -EPERM; 56 } 57 return acpi_sleep_prepare(acpi_state); 58} 59 60/** 61 * acpi_pm_enter - Actually enter a sleep state. 62 * @pm_state: State we're entering. 63 * 64 * Flush caches and go to sleep. For STR or STD, we have to call 65 * arch-specific assembly, which in turn call acpi_enter_sleep_state(). 66 * It's unfortunate, but it works. Please fix if you're feeling frisky. 67 */ 68 69static int acpi_pm_enter(suspend_state_t pm_state) 70{ 71 acpi_status status = AE_OK; 72 unsigned long flags = 0; 73 u32 acpi_state = acpi_suspend_states[pm_state]; 74 75 ACPI_FLUSH_CPU_CACHE(); 76 77 /* Do arch specific saving of state. */ 78 if (pm_state > PM_SUSPEND_STANDBY) { 79 int error = acpi_save_state_mem(); 80 if (error) 81 return error; 82 } 83 84 local_irq_save(flags); 85 acpi_enable_wakeup_device(acpi_state); 86 switch (pm_state) { 87 case PM_SUSPEND_STANDBY: 88 barrier(); 89 status = acpi_enter_sleep_state(acpi_state); 90 break; 91 92 case PM_SUSPEND_MEM: 93 do_suspend_lowlevel(); 94 break; 95 96 default: 97 return -EINVAL; 98 } 99 100 /* ACPI 3.0 specs (P62) says that it's the responsabilty 101 * of the OSPM to clear the status bit [ implying that the 102 * POWER_BUTTON event should not reach userspace ] 103 */ 104 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) 105 acpi_clear_event(ACPI_EVENT_POWER_BUTTON); 106 107 local_irq_restore(flags); 108 printk(KERN_DEBUG "Back to C!\n"); 109 110 /* restore processor state 111 * We should only be here if we're coming back from STR or STD. 112 * And, in the case of the latter, the memory image should have already 113 * been loaded from disk. 114 */ 115 if (pm_state > PM_SUSPEND_STANDBY) 116 acpi_restore_state_mem(); 117 118 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 119} 120 121/** 122 * acpi_pm_finish - Finish up suspend sequence. 123 * @pm_state: State we're coming out of. 124 * 125 * This is called after we wake back up (or if entering the sleep state 126 * failed). 127 */ 128 129static int acpi_pm_finish(suspend_state_t pm_state) 130{ 131 u32 acpi_state = acpi_suspend_states[pm_state]; 132 133 acpi_leave_sleep_state(acpi_state); 134 acpi_disable_wakeup_device(acpi_state); 135 136 /* reset firmware waking vector */ 137 acpi_set_firmware_waking_vector((acpi_physical_address) 0); 138 139 if (init_8259A_after_S1) { 140 printk("Broken toshiba laptop -> kicking interrupts\n"); 141 init_8259A(0); 142 } 143 return 0; 144} 145 146int acpi_suspend(u32 acpi_state) 147{ 148 suspend_state_t states[] = { 149 [1] = PM_SUSPEND_STANDBY, 150 [3] = PM_SUSPEND_MEM, 151 [5] = PM_SUSPEND_MAX 152 }; 153 154 if (acpi_state < 6 && states[acpi_state]) 155 return pm_suspend(states[acpi_state]); 156 if (acpi_state == 4) 157 return hibernate(); 158 return -EINVAL; 159} 160 161static int acpi_pm_state_valid(suspend_state_t pm_state) 162{ 163 u32 acpi_state; 164 165 switch (pm_state) { 166 case PM_SUSPEND_ON: 167 case PM_SUSPEND_STANDBY: 168 case PM_SUSPEND_MEM: 169 acpi_state = acpi_suspend_states[pm_state]; 170 171 return sleep_states[acpi_state]; 172 default: 173 return 0; 174 } 175} 176 177static struct pm_ops acpi_pm_ops = { 178 .valid = acpi_pm_state_valid, 179 .prepare = acpi_pm_prepare, 180 .enter = acpi_pm_enter, 181 .finish = acpi_pm_finish, 182}; 183 184#ifdef CONFIG_SOFTWARE_SUSPEND 185static int acpi_hibernation_prepare(void) 186{ 187 return acpi_sleep_prepare(ACPI_STATE_S4); 188} 189 190static int acpi_hibernation_enter(void) 191{ 192 acpi_status status = AE_OK; 193 unsigned long flags = 0; 194 195 ACPI_FLUSH_CPU_CACHE(); 196 197 local_irq_save(flags); 198 acpi_enable_wakeup_device(ACPI_STATE_S4); 199 /* This shouldn't return. If it returns, we have a problem */ 200 status = acpi_enter_sleep_state(ACPI_STATE_S4); 201 local_irq_restore(flags); 202 203 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 204} 205 206static void acpi_hibernation_finish(void) 207{ 208 acpi_leave_sleep_state(ACPI_STATE_S4); 209 acpi_disable_wakeup_device(ACPI_STATE_S4); 210 211 /* reset firmware waking vector */ 212 acpi_set_firmware_waking_vector((acpi_physical_address) 0); 213 214 if (init_8259A_after_S1) { 215 printk("Broken toshiba laptop -> kicking interrupts\n"); 216 init_8259A(0); 217 } 218} 219 220static struct hibernation_ops acpi_hibernation_ops = { 221 .prepare = acpi_hibernation_prepare, 222 .enter = acpi_hibernation_enter, 223 .finish = acpi_hibernation_finish, 224}; 225#endif /* CONFIG_SOFTWARE_SUSPEND */ 226 227/* 228 * Toshiba fails to preserve interrupts over S1, reinitialization 229 * of 8259 is needed after S1 resume. 230 */ 231static int __init init_ints_after_s1(struct dmi_system_id *d) 232{ 233 printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident); 234 init_8259A_after_S1 = 1; 235 return 0; 236} 237 238static struct dmi_system_id __initdata acpisleep_dmi_table[] = { 239 { 240 .callback = init_ints_after_s1, 241 .ident = "Toshiba Satellite 4030cdt", 242 .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),}, 243 }, 244 {}, 245}; 246 247int __init acpi_sleep_init(void) 248{ 249 int i = 0; 250 251 dmi_check_system(acpisleep_dmi_table); 252 253 if (acpi_disabled) 254 return 0; 255 256 printk(KERN_INFO PREFIX "(supports"); 257 for (i = 0; i < ACPI_S_STATE_COUNT; i++) { 258 acpi_status status; 259 u8 type_a, type_b; 260 status = acpi_get_sleep_type_data(i, &type_a, &type_b); 261 if (ACPI_SUCCESS(status)) { 262 sleep_states[i] = 1; 263 printk(" S%d", i); 264 } 265 } 266 printk(")\n"); 267 268 pm_set_ops(&acpi_pm_ops); 269 270#ifdef CONFIG_SOFTWARE_SUSPEND 271 if (sleep_states[ACPI_STATE_S4]) 272 hibernation_set_ops(&acpi_hibernation_ops); 273#else 274 sleep_states[ACPI_STATE_S4] = 0; 275#endif 276 277 return 0; 278} 279