Linux 2.6.13-rc4
[linux-2.6/next.git] / arch / arm / mach-pxa / pm.c
blobac4dd4336160bc2d202f7059e639d83836f52bda
1 /*
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>
28 * Debug macros
30 #undef DEBUG
32 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
33 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
35 #define RESTORE_GPLEVEL(n) do { \
36 GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \
37 GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \
38 } while (0)
41 * List of global PXA peripheral registers to preserve.
42 * More ones like CP and general purpose register values are preserved
43 * with the stack pointer in sleep.S.
45 enum { SLEEP_SAVE_START = 0,
47 SLEEP_SAVE_GPLR0, SLEEP_SAVE_GPLR1, SLEEP_SAVE_GPLR2, SLEEP_SAVE_GPLR3,
48 SLEEP_SAVE_GPDR0, SLEEP_SAVE_GPDR1, SLEEP_SAVE_GPDR2, SLEEP_SAVE_GPDR3,
49 SLEEP_SAVE_GRER0, SLEEP_SAVE_GRER1, SLEEP_SAVE_GRER2, SLEEP_SAVE_GRER3,
50 SLEEP_SAVE_GFER0, SLEEP_SAVE_GFER1, SLEEP_SAVE_GFER2, SLEEP_SAVE_GFER3,
51 SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2, SLEEP_SAVE_PGSR3,
53 SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
54 SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
55 SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
56 SLEEP_SAVE_GAFR3_L, SLEEP_SAVE_GAFR3_U,
58 SLEEP_SAVE_PSTR,
60 SLEEP_SAVE_ICMR,
61 SLEEP_SAVE_CKEN,
63 #ifdef CONFIG_PXA27x
64 SLEEP_SAVE_MDREFR,
65 SLEEP_SAVE_PWER, SLEEP_SAVE_PCFR, SLEEP_SAVE_PRER,
66 SLEEP_SAVE_PFER, SLEEP_SAVE_PKWR,
67 #endif
69 SLEEP_SAVE_CKSUM,
71 SLEEP_SAVE_SIZE
75 static int pxa_pm_enter(suspend_state_t state)
77 unsigned long sleep_save[SLEEP_SAVE_SIZE];
78 unsigned long checksum = 0;
79 struct timespec delta, rtc;
80 int i;
81 extern void pxa_cpu_pm_enter(suspend_state_t state);
83 #ifdef CONFIG_IWMMXT
84 /* force any iWMMXt context to ram **/
85 iwmmxt_task_disable(NULL);
86 #endif
88 /* preserve current time */
89 rtc.tv_sec = RCNR;
90 rtc.tv_nsec = 0;
91 save_time_delta(&delta, &rtc);
93 SAVE(GPLR0); SAVE(GPLR1); SAVE(GPLR2);
94 SAVE(GPDR0); SAVE(GPDR1); SAVE(GPDR2);
95 SAVE(GRER0); SAVE(GRER1); SAVE(GRER2);
96 SAVE(GFER0); SAVE(GFER1); SAVE(GFER2);
97 SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
99 SAVE(GAFR0_L); SAVE(GAFR0_U);
100 SAVE(GAFR1_L); SAVE(GAFR1_U);
101 SAVE(GAFR2_L); SAVE(GAFR2_U);
103 #ifdef CONFIG_PXA27x
104 SAVE(MDREFR);
105 SAVE(GPLR3); SAVE(GPDR3); SAVE(GRER3); SAVE(GFER3); SAVE(PGSR3);
106 SAVE(GAFR3_L); SAVE(GAFR3_U);
107 SAVE(PWER); SAVE(PCFR); SAVE(PRER);
108 SAVE(PFER); SAVE(PKWR);
109 #endif
111 SAVE(ICMR);
112 ICMR = 0;
114 SAVE(CKEN);
115 SAVE(PSTR);
117 /* Note: wake up source are set up in each machine specific files */
119 /* clear GPIO transition detect bits */
120 GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
121 #ifdef CONFIG_PXA27x
122 GEDR3 = GEDR3;
123 #endif
125 /* Clear sleep reset status */
126 RCSR = RCSR_SMR;
128 /* before sleeping, calculate and save a checksum */
129 for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
130 checksum += sleep_save[i];
131 sleep_save[SLEEP_SAVE_CKSUM] = checksum;
133 /* *** go zzz *** */
134 pxa_cpu_pm_enter(state);
136 cpu_init();
138 /* after sleeping, validate the checksum */
139 checksum = 0;
140 for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
141 checksum += sleep_save[i];
143 /* if invalid, display message and wait for a hardware reset */
144 if (checksum != sleep_save[SLEEP_SAVE_CKSUM]) {
145 #ifdef CONFIG_ARCH_LUBBOCK
146 LUB_HEXLED = 0xbadbadc5;
147 #endif
148 while (1)
149 pxa_cpu_pm_enter(state);
152 /* ensure not to come back here if it wasn't intended */
153 PSPR = 0;
155 /* restore registers */
156 RESTORE(GAFR0_L); RESTORE(GAFR0_U);
157 RESTORE(GAFR1_L); RESTORE(GAFR1_U);
158 RESTORE(GAFR2_L); RESTORE(GAFR2_U);
159 RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
160 RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2);
161 RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2);
162 RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2);
163 RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
165 #ifdef CONFIG_PXA27x
166 RESTORE(MDREFR);
167 RESTORE(GAFR3_L); RESTORE(GAFR3_U); RESTORE_GPLEVEL(3);
168 RESTORE(GPDR3); RESTORE(GRER3); RESTORE(GFER3); RESTORE(PGSR3);
169 RESTORE(PWER); RESTORE(PCFR); RESTORE(PRER);
170 RESTORE(PFER); RESTORE(PKWR);
171 #endif
173 PSSR = PSSR_RDH | PSSR_PH;
175 RESTORE(CKEN);
177 ICLR = 0;
178 ICCR = 1;
179 RESTORE(ICMR);
181 RESTORE(PSTR);
183 /* restore current time */
184 rtc.tv_sec = RCNR;
185 restore_time_delta(&delta, &rtc);
187 #ifdef DEBUG
188 printk(KERN_DEBUG "*** made it back from resume\n");
189 #endif
191 return 0;
194 unsigned long sleep_phys_sp(void *sp)
196 return virt_to_phys(sp);
200 * Called after processes are frozen, but before we shut down devices.
202 static int pxa_pm_prepare(suspend_state_t state)
204 extern int pxa_cpu_pm_prepare(suspend_state_t state);
206 return pxa_cpu_pm_prepare(state);
210 * Called after devices are re-setup, but before processes are thawed.
212 static int pxa_pm_finish(suspend_state_t state)
214 return 0;
218 * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
220 static struct pm_ops pxa_pm_ops = {
221 .pm_disk_mode = PM_DISK_FIRMWARE,
222 .prepare = pxa_pm_prepare,
223 .enter = pxa_pm_enter,
224 .finish = pxa_pm_finish,
227 static int __init pxa_pm_init(void)
229 pm_set_ops(&pxa_pm_ops);
230 return 0;
233 late_initcall(pxa_pm_init);