2 * PXA250/210 Power Management Routines
4 * Original code for the SA11x0:
5 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
7 * Modified for the PXA250 by Nicolas Pitre:
8 * Copyright (c) 2002 Monta Vista Software, Inc.
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License.
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/suspend.h>
16 #include <linux/errno.h>
17 #include <linux/time.h>
19 #include <asm/hardware.h>
20 #include <asm/memory.h>
21 #include <asm/system.h>
22 #include <asm/arch/pm.h>
23 #include <asm/arch/pxa-regs.h>
24 #include <asm/arch/lubbock.h>
25 #include <asm/mach/time.h>
33 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
34 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
36 #define RESTORE_GPLEVEL(n) do { \
37 GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \
38 GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \
42 * List of global PXA peripheral registers to preserve.
43 * More ones like CP and general purpose register values are preserved
44 * with the stack pointer in sleep.S.
46 enum { SLEEP_SAVE_START = 0,
48 SLEEP_SAVE_GPLR0, SLEEP_SAVE_GPLR1, SLEEP_SAVE_GPLR2, SLEEP_SAVE_GPLR3,
49 SLEEP_SAVE_GPDR0, SLEEP_SAVE_GPDR1, SLEEP_SAVE_GPDR2, SLEEP_SAVE_GPDR3,
50 SLEEP_SAVE_GRER0, SLEEP_SAVE_GRER1, SLEEP_SAVE_GRER2, SLEEP_SAVE_GRER3,
51 SLEEP_SAVE_GFER0, SLEEP_SAVE_GFER1, SLEEP_SAVE_GFER2, SLEEP_SAVE_GFER3,
52 SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2, SLEEP_SAVE_PGSR3,
54 SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
55 SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
56 SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
57 SLEEP_SAVE_GAFR3_L, SLEEP_SAVE_GAFR3_U,
66 SLEEP_SAVE_PWER, SLEEP_SAVE_PCFR, SLEEP_SAVE_PRER,
67 SLEEP_SAVE_PFER, SLEEP_SAVE_PKWR,
76 int pxa_pm_enter(suspend_state_t state)
78 unsigned long sleep_save[SLEEP_SAVE_SIZE];
79 unsigned long checksum = 0;
80 struct timespec delta, rtc;
82 extern void pxa_cpu_pm_enter(suspend_state_t state);
85 /* force any iWMMXt context to ram **/
86 iwmmxt_task_disable(NULL);
89 /* preserve current time */
92 save_time_delta(&delta, &rtc);
94 SAVE(GPLR0); SAVE(GPLR1); SAVE(GPLR2);
95 SAVE(GPDR0); SAVE(GPDR1); SAVE(GPDR2);
96 SAVE(GRER0); SAVE(GRER1); SAVE(GRER2);
97 SAVE(GFER0); SAVE(GFER1); SAVE(GFER2);
98 SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
100 SAVE(GAFR0_L); SAVE(GAFR0_U);
101 SAVE(GAFR1_L); SAVE(GAFR1_U);
102 SAVE(GAFR2_L); SAVE(GAFR2_U);
106 SAVE(GPLR3); SAVE(GPDR3); SAVE(GRER3); SAVE(GFER3); SAVE(PGSR3);
107 SAVE(GAFR3_L); SAVE(GAFR3_U);
108 SAVE(PWER); SAVE(PCFR); SAVE(PRER);
109 SAVE(PFER); SAVE(PKWR);
118 /* Note: wake up source are set up in each machine specific files */
120 /* clear GPIO transition detect bits */
121 GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
126 /* Clear sleep reset status */
129 /* before sleeping, calculate and save a checksum */
130 for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
131 checksum += sleep_save[i];
132 sleep_save[SLEEP_SAVE_CKSUM] = checksum;
135 pxa_cpu_pm_enter(state);
139 /* after sleeping, validate the checksum */
141 for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
142 checksum += sleep_save[i];
144 /* if invalid, display message and wait for a hardware reset */
145 if (checksum != sleep_save[SLEEP_SAVE_CKSUM]) {
146 #ifdef CONFIG_ARCH_LUBBOCK
147 LUB_HEXLED = 0xbadbadc5;
150 pxa_cpu_pm_enter(state);
153 /* ensure not to come back here if it wasn't intended */
156 /* restore registers */
157 RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
158 RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2);
159 RESTORE(GAFR0_L); RESTORE(GAFR0_U);
160 RESTORE(GAFR1_L); RESTORE(GAFR1_U);
161 RESTORE(GAFR2_L); RESTORE(GAFR2_U);
162 RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2);
163 RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2);
164 RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
168 RESTORE_GPLEVEL(3); RESTORE(GPDR3);
169 RESTORE(GAFR3_L); RESTORE(GAFR3_U);
170 RESTORE(GRER3); RESTORE(GFER3); RESTORE(PGSR3);
171 RESTORE(PWER); RESTORE(PCFR); RESTORE(PRER);
172 RESTORE(PFER); RESTORE(PKWR);
175 PSSR = PSSR_RDH | PSSR_PH;
185 /* restore current time */
187 restore_time_delta(&delta, &rtc);
190 printk(KERN_DEBUG "*** made it back from resume\n");
196 EXPORT_SYMBOL_GPL(pxa_pm_enter);
198 unsigned long sleep_phys_sp(void *sp)
200 return virt_to_phys(sp);
204 * Called after processes are frozen, but before we shut down devices.
206 int pxa_pm_prepare(suspend_state_t state)
208 extern int pxa_cpu_pm_prepare(suspend_state_t state);
210 return pxa_cpu_pm_prepare(state);
213 EXPORT_SYMBOL_GPL(pxa_pm_prepare);
216 * Called after devices are re-setup, but before processes are thawed.
218 int pxa_pm_finish(suspend_state_t state)
223 EXPORT_SYMBOL_GPL(pxa_pm_finish);
226 * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
228 static struct pm_ops pxa_pm_ops = {
229 .pm_disk_mode = PM_DISK_FIRMWARE,
230 .prepare = pxa_pm_prepare,
231 .enter = pxa_pm_enter,
232 .finish = pxa_pm_finish,
235 static int __init pxa_pm_init(void)
237 pm_set_ops(&pxa_pm_ops);
241 device_initcall(pxa_pm_init);