1 /*
2 * sleep.c - ACPI sleep support.
3 *
4 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
5 * Copyright (c) 2000-2003 Patrick Mochel
6 * Copyright (c) 2003 Open Source Development Lab
7 *
8 * This file is released under the GPLv2.
9 *
10 */
11
12 #include <linux/delay.h>
13 #include <linux/irq.h>
14 #include <linux/dmi.h>
15 #include <linux/device.h>
16 #include <linux/suspend.h>
17 #include <asm/io.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 };
35
36 static int init_8259A_after_S1;
37
38 /**
39 * acpi_pm_prepare - Do preliminary suspend work.
40 * @pm_state: suspend state we're entering.
41 *
42 * Make sure we support the state. If we do, and we need it, set the
43 * firmware waking vector and do arch-specific nastiness to get the
44 * wakeup code to the waking vector.
45 */
46
47 static int acpi_pm_prepare(suspend_state_t pm_state)
48 {
49 u32 acpi_state = acpi_suspend_states[pm_state];
50
51 if (!sleep_states[acpi_state])
52 return -EPERM;
53
54 /* do we have a wakeup address for S2 and S3? */
55 /* Here, we support only S4BIOS, those we set the wakeup address */
56 /* S4OS is only supported for now via swsusp.. */
57 if (pm_state == PM_SUSPEND_MEM || pm_state == PM_SUSPEND_DISK) {
58 if (!acpi_wakeup_address)
59 return -EFAULT;
60 acpi_set_firmware_waking_vector(
61 (acpi_physical_address) virt_to_phys(
62 (void *)acpi_wakeup_address));
63 }
64 ACPI_FLUSH_CPU_CACHE();
65 acpi_enable_wakeup_device_prep(acpi_state);
66 acpi_enter_sleep_state_prep(acpi_state);
67 return 0;
68 }
69
70
71 /**
72 * acpi_pm_enter - Actually enter a sleep state.
73 * @pm_state: State we're entering.
74 *
75 * Flush caches and go to sleep. For STR or STD, we have to call
76 * arch-specific assembly, which in turn call acpi_enter_sleep_state().
77 * It's unfortunate, but it works. Please fix if you're feeling frisky.
78 */
79
80 static int acpi_pm_enter(suspend_state_t pm_state)
81 {
82 acpi_status status = AE_OK;
83 unsigned long flags = 0;
84 u32 acpi_state = acpi_suspend_states[pm_state];
85
86 ACPI_FLUSH_CPU_CACHE();
87
88 /* Do arch specific saving of state. */
89 if (pm_state > PM_SUSPEND_STANDBY) {
90 int error = acpi_save_state_mem();
91 if (error)
92 return error;
93 }
94
95
96 local_irq_save(flags);
97 acpi_enable_wakeup_device(acpi_state);
98 switch (pm_state)
99 {
100 case PM_SUSPEND_STANDBY:
101 barrier();
102 status = acpi_enter_sleep_state(acpi_state);
103 break;
104
105 case PM_SUSPEND_MEM:
106 do_suspend_lowlevel();
107 break;
108
109 case PM_SUSPEND_DISK:
110 if (acpi_pm_ops.pm_disk_mode == PM_DISK_PLATFORM)
111 status = acpi_enter_sleep_state(acpi_state);
112 else
113 do_suspend_lowlevel_s4bios();
114 break;
115 default:
116 return -EINVAL;
117 }
118 local_irq_restore(flags);
119 printk(KERN_DEBUG "Back to C!\n");
120
121 /* restore processor state
122 * We should only be here if we're coming back from STR or STD.
123 * And, in the case of the latter, the memory image should have already
124 * been loaded from disk.
125 */
126 if (pm_state > PM_SUSPEND_STANDBY)
127 acpi_restore_state_mem();
128
129
130 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
131 }
132
133
134 /**
135 * acpi_pm_finish - Finish up suspend sequence.
136 * @pm_state: State we're coming out of.
137 *
138 * This is called after we wake back up (or if entering the sleep state
139 * failed).
140 */
141
142 static int acpi_pm_finish(suspend_state_t pm_state)
143 {
144 u32 acpi_state = acpi_suspend_states[pm_state];
145
146 acpi_leave_sleep_state(acpi_state);
147 acpi_disable_wakeup_device(acpi_state);
148
149 /* reset firmware waking vector */
150 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
151
152 if (init_8259A_after_S1) {
153 printk("Broken toshiba laptop -> kicking interrupts\n");
154 init_8259A(0);
155 }
156 return 0;
157 }
158
159
160 int acpi_suspend(u32 acpi_state)
161 {
162 suspend_state_t states[] = {
163 [1] = PM_SUSPEND_STANDBY,
164 [3] = PM_SUSPEND_MEM,
165 [4] = PM_SUSPEND_DISK,
166 };
167
168 if (acpi_state <= 4 && states[acpi_state])
169 return pm_suspend(states[acpi_state]);
170 return -EINVAL;
171 }
172
173 static struct pm_ops acpi_pm_ops = {
174 .prepare = acpi_pm_prepare,
175 .enter = acpi_pm_enter,
176 .finish = acpi_pm_finish,
177 };
178
179
180 /*
181 * Toshiba fails to preserve interrupts over S1, reinitialization
182 * of 8259 is needed after S1 resume.
183 */
184 static int __init init_ints_after_s1(struct dmi_system_id *d)
185 {
186 printk(KERN_WARNING "%s with broken S1 detected.\n", d->ident);
187 init_8259A_after_S1 = 1;
188 return 0;
189 }
190
191 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
192 {
193 .callback = init_ints_after_s1,
194 .ident = "Toshiba Satellite 4030cdt",
195 .matches = { DMI_MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"), },
196 },
197 { },
198 };
199
200 static int __init acpi_sleep_init(void)
201 {
202 int i = 0;
203
204 dmi_check_system(acpisleep_dmi_table);
205
206 if (acpi_disabled)
207 return 0;
208
209 printk(KERN_INFO PREFIX "(supports");
210 for (i=0; i < ACPI_S_STATE_COUNT; i++) {
211 acpi_status status;
212 u8 type_a, type_b;
213 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
214 if (ACPI_SUCCESS(status)) {
215 sleep_states[i] = 1;
216 printk(" S%d", i);
217 }
218 if (i == ACPI_STATE_S4) {
219 if (acpi_gbl_FACS->S4bios_f) {
220 sleep_states[i] = 1;
221 printk(" S4bios");
222 acpi_pm_ops.pm_disk_mode = PM_DISK_FIRMWARE;
223 }
224 if (sleep_states[i])
225 acpi_pm_ops.pm_disk_mode = PM_DISK_PLATFORM;
226 }
227 }
228 printk(")\n");
229
230 pm_set_ops(&acpi_pm_ops);
231 return 0;
232 }
233
234 late_initcall(acpi_sleep_init);
235
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