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/config.h>
14 #include <linux/init.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/pxa-regs.h>
23 #include <asm/arch/lubbock.h>
24 #include <asm/mach/time.h>
32 extern void pxa_cpu_suspend(void);
33 extern void pxa_cpu_resume(void);
35 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
36 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
38 #define RESTORE_GPLEVEL(n) do { \
39 GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \
40 GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \
44 * List of global PXA peripheral registers to preserve.
45 * More ones like CP and general purpose register values are preserved
46 * with the stack pointer in sleep.S.
48 enum { SLEEP_SAVE_START = 0,
50 SLEEP_SAVE_GPLR0, SLEEP_SAVE_GPLR1, SLEEP_SAVE_GPLR2,
51 SLEEP_SAVE_GPDR0, SLEEP_SAVE_GPDR1, SLEEP_SAVE_GPDR2,
52 SLEEP_SAVE_GRER0, SLEEP_SAVE_GRER1, SLEEP_SAVE_GRER2,
53 SLEEP_SAVE_GFER0, SLEEP_SAVE_GFER1, SLEEP_SAVE_GFER2,
54 SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR2_L,
55 SLEEP_SAVE_GAFR0_U, SLEEP_SAVE_GAFR1_U, SLEEP_SAVE_GAFR2_U,
66 static int pxa_pm_enter(suspend_state_t state)
68 unsigned long sleep_save[SLEEP_SAVE_SIZE];
69 unsigned long checksum = 0;
70 struct timespec delta, rtc;
73 if (state != PM_SUSPEND_MEM)
76 /* preserve current time */
79 save_time_delta(&delta, &rtc);
81 SAVE(GPLR0); SAVE(GPLR1); SAVE(GPLR2);
82 SAVE(GPDR0); SAVE(GPDR1); SAVE(GPDR2);
83 SAVE(GRER0); SAVE(GRER1); SAVE(GRER2);
84 SAVE(GFER0); SAVE(GFER1); SAVE(GFER2);
85 SAVE(GAFR0_L); SAVE(GAFR0_U);
86 SAVE(GAFR1_L); SAVE(GAFR1_U);
87 SAVE(GAFR2_L); SAVE(GAFR2_U);
95 /* Note: wake up source are set up in each machine specific files */
97 /* clear GPIO transition detect bits */
98 GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
100 /* Clear sleep reset status */
103 /* set resume return address */
104 PSPR = virt_to_phys(pxa_cpu_resume);
106 /* before sleeping, calculate and save a checksum */
107 for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
108 checksum += sleep_save[i];
109 sleep_save[SLEEP_SAVE_CKSUM] = checksum;
114 /* after sleeping, validate the checksum */
116 for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
117 checksum += sleep_save[i];
119 /* if invalid, display message and wait for a hardware reset */
120 if (checksum != sleep_save[SLEEP_SAVE_CKSUM]) {
121 #ifdef CONFIG_ARCH_LUBBOCK
122 LUB_HEXLED = 0xbadbadc5;
127 /* ensure not to come back here if it wasn't intended */
130 /* restore registers */
131 RESTORE(GAFR0_L); RESTORE(GAFR0_U);
132 RESTORE(GAFR1_L); RESTORE(GAFR1_U);
133 RESTORE(GAFR2_L); RESTORE(GAFR2_U);
134 RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
135 RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2);
136 RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2);
137 RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2);
139 PSSR = PSSR_RDH | PSSR_PH;
147 /* restore current time */
149 restore_time_delta(&delta, &rtc);
152 printk(KERN_DEBUG "*** made it back from resume\n");
158 unsigned long sleep_phys_sp(void *sp)
160 return virt_to_phys(sp);
164 * Called after processes are frozen, but before we shut down devices.
166 static int pxa_pm_prepare(suspend_state_t state)
172 * Called after devices are re-setup, but before processes are thawed.
174 static int pxa_pm_finish(suspend_state_t state)
180 * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
182 static struct pm_ops pxa_pm_ops = {
183 .pm_disk_mode = PM_DISK_FIRMWARE,
184 .prepare = pxa_pm_prepare,
185 .enter = pxa_pm_enter,
186 .finish = pxa_pm_finish,
189 static int __init pxa_pm_init(void)
191 pm_set_ops(&pxa_pm_ops);
195 late_initcall(pxa_pm_init);