Merge branch 'upstream' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev
[linux-2.6] / drivers / acpi / sleep / main.c
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
22 u8 sleep_states[ACPI_S_STATE_COUNT];
23
24 static struct pm_ops acpi_pm_ops;
25
26 extern void do_suspend_lowlevel_s4bios(void);
27 extern void do_suspend_lowlevel(void);
28
29 static u32 acpi_suspend_states[] = {
30         [PM_SUSPEND_ON] = ACPI_STATE_S0,
31         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
32         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
33         [PM_SUSPEND_DISK] = ACPI_STATE_S4,
34         [PM_SUSPEND_MAX] = ACPI_STATE_S5
35 };
36
37 static int init_8259A_after_S1;
38
39 /**
40  *      acpi_pm_prepare - Do preliminary suspend work.
41  *      @pm_state:              suspend state we're entering.
42  *
43  *      Make sure we support the state. If we do, and we need it, set the
44  *      firmware waking vector and do arch-specific nastiness to get the 
45  *      wakeup code to the waking vector. 
46  */
47
48 extern int acpi_sleep_prepare(u32 acpi_state);
49 extern void acpi_power_off(void);
50
51 static int acpi_pm_prepare(suspend_state_t pm_state)
52 {
53         u32 acpi_state = acpi_suspend_states[pm_state];
54
55         if (!sleep_states[acpi_state]) {
56                 printk("acpi_pm_prepare does not support %d \n", pm_state);
57                 return -EPERM;
58         }
59         return acpi_sleep_prepare(acpi_state);
60 }
61
62 /**
63  *      acpi_pm_enter - Actually enter a sleep state.
64  *      @pm_state:              State we're entering.
65  *
66  *      Flush caches and go to sleep. For STR or STD, we have to call 
67  *      arch-specific assembly, which in turn call acpi_enter_sleep_state().
68  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
69  */
70
71 static int acpi_pm_enter(suspend_state_t pm_state)
72 {
73         acpi_status status = AE_OK;
74         unsigned long flags = 0;
75         u32 acpi_state = acpi_suspend_states[pm_state];
76
77         ACPI_FLUSH_CPU_CACHE();
78
79         /* Do arch specific saving of state. */
80         if (pm_state > PM_SUSPEND_STANDBY) {
81                 int error = acpi_save_state_mem();
82                 if (error)
83                         return error;
84         }
85
86         local_irq_save(flags);
87         acpi_enable_wakeup_device(acpi_state);
88         switch (pm_state) {
89         case PM_SUSPEND_STANDBY:
90                 barrier();
91                 status = acpi_enter_sleep_state(acpi_state);
92                 break;
93
94         case PM_SUSPEND_MEM:
95                 do_suspend_lowlevel();
96                 break;
97
98         case PM_SUSPEND_DISK:
99                 if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
100                         status = acpi_enter_sleep_state(acpi_state);
101                 else
102                         do_suspend_lowlevel_s4bios();
103                 break;
104         case PM_SUSPEND_MAX:
105                 acpi_power_off();
106                 break;
107
108         default:
109                 return -EINVAL;
110         }
111         local_irq_restore(flags);
112         printk(KERN_DEBUG "Back to C!\n");
113
114         /* restore processor state
115          * We should only be here if we're coming back from STR or STD.
116          * And, in the case of the latter, the memory image should have already
117          * been loaded from disk.
118          */
119         if (pm_state > PM_SUSPEND_STANDBY)
120                 acpi_restore_state_mem();
121
122         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
123 }
124
125 /**
126  *      acpi_pm_finish - Finish up suspend sequence.
127  *      @pm_state:              State we're coming out of.
128  *
129  *      This is called after we wake back up (or if entering the sleep state
130  *      failed). 
131  */
132
133 static int acpi_pm_finish(suspend_state_t pm_state)
134 {
135         u32 acpi_state = acpi_suspend_states[pm_state];
136
137         acpi_leave_sleep_state(acpi_state);
138         acpi_disable_wakeup_device(acpi_state);
139
140         /* reset firmware waking vector */
141         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
142
143         if (init_8259A_after_S1) {
144                 printk("Broken toshiba laptop -> kicking interrupts\n");
145                 init_8259A(0);
146         }
147         return 0;
148 }
149
150 int acpi_suspend(u32 acpi_state)
151 {
152         suspend_state_t states[] = {
153                 [1] = PM_SUSPEND_STANDBY,
154                 [3] = PM_SUSPEND_MEM,
155                 [4] = PM_SUSPEND_DISK,
156                 [5] = PM_SUSPEND_MAX
157         };
158
159         if (acpi_state < 6 && states[acpi_state])
160                 return pm_suspend(states[acpi_state]);
161         return -EINVAL;
162 }
163
164 static struct pm_ops acpi_pm_ops = {
165         .prepare = acpi_pm_prepare,
166         .enter = acpi_pm_enter,
167         .finish = acpi_pm_finish,
168 };
169
170 /*
171  * Toshiba fails to preserve interrupts over S1, reinitialization
172  * of 8259 is needed after S1 resume.
173  */
174 static int __init init_ints_after_s1(struct dmi_system_id *d)
175 {
176         printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
177         init_8259A_after_S1 = 1;
178         return 0;
179 }
180
181 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
182         {
183          .callback = init_ints_after_s1,
184          .ident = "Toshiba Satellite 4030cdt",
185          .matches = {DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),},
186          },
187         {},
188 };
189
190 static int __init acpi_sleep_init(void)
191 {
192         int i = 0;
193
194         dmi_check_system(acpisleep_dmi_table);
195
196         if (acpi_disabled)
197                 return 0;
198
199         printk(KERN_INFO PREFIX "(supports");
200         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
201                 acpi_status status;
202                 u8 type_a, type_b;
203                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
204                 if (ACPI_SUCCESS(status)) {
205                         sleep_states[i] = 1;
206                         printk(" S%d", i);
207                 }
208                 if (i == ACPI_STATE_S4) {
209                         if (acpi_gbl_FACS->S4bios_f) {
210                                 sleep_states[i] = 1;
211                                 printk(" S4bios");
212                                 acpi_pm_ops.pm_disk_mode = PM_DISK_FIRMWARE;
213                         }
214                         if (sleep_states[i])
215                                 acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM;
216                 }
217         }
218         printk(")\n");
219
220         pm_set_ops(&acpi_pm_ops);
221         return 0;
222 }
223
224 late_initcall(acpi_sleep_init);