arch/arm/mach-pxa/pm.c

   1 /*
   2  * PXA250/210 Power Management Routines
   3  *
   4  * Original code for the SA11x0:
   5  * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
   6  *
   7  * Modified for the PXA250 by Nicolas Pitre:
   8  * Copyright (c) 2002 Monta Vista Software, Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License.
  12  */
  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>
  18
  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>
  26
  27
  28 /*
  29  * Debug macros
  30  */
  31 #undef DEBUG
  32
  33 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
  34 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
  35
  36 #define RESTORE_GPLEVEL(n) do { \
  37         GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \
  38         GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \
  39 } while (0)
  40
  41 /*
  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.
  45  */
  46 enum {  SLEEP_SAVE_START = 0,
  47
  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,
  53
  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,
  58
  59         SLEEP_SAVE_PSTR,
  60
  61         SLEEP_SAVE_ICMR,
  62         SLEEP_SAVE_CKEN,
  63
  64 #ifdef CONFIG_PXA27x
  65         SLEEP_SAVE_MDREFR,
  66         SLEEP_SAVE_PWER, SLEEP_SAVE_PCFR, SLEEP_SAVE_PRER,
  67         SLEEP_SAVE_PFER, SLEEP_SAVE_PKWR,
  68 #endif
  69
  70         SLEEP_SAVE_CKSUM,
  71
  72         SLEEP_SAVE_SIZE
  73 };
  74
  75
  76 int pxa_pm_enter(suspend_state_t state)
  77 {
  78         unsigned long sleep_save[SLEEP_SAVE_SIZE];
  79         unsigned long checksum = 0;
  80         struct timespec delta, rtc;
  81         int i;
  82         extern void pxa_cpu_pm_enter(suspend_state_t state);
  83
  84 #ifdef CONFIG_IWMMXT
  85         /* force any iWMMXt context to ram **/
  86         if (elf_hwcap & HWCAP_IWMMXT)
  87                 iwmmxt_task_disable(NULL);
  88 #endif
  89
  90         /* preserve current time */
  91         rtc.tv_sec = RCNR;
  92         rtc.tv_nsec = 0;
  93         save_time_delta(&delta, &rtc);
  94
  95         SAVE(GPLR0); SAVE(GPLR1); SAVE(GPLR2);
  96         SAVE(GPDR0); SAVE(GPDR1); SAVE(GPDR2);
  97         SAVE(GRER0); SAVE(GRER1); SAVE(GRER2);
  98         SAVE(GFER0); SAVE(GFER1); SAVE(GFER2);
  99         SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
 100
 101         SAVE(GAFR0_L); SAVE(GAFR0_U);
 102         SAVE(GAFR1_L); SAVE(GAFR1_U);
 103         SAVE(GAFR2_L); SAVE(GAFR2_U);
 104
 105 #ifdef CONFIG_PXA27x
 106         SAVE(MDREFR);
 107         SAVE(GPLR3); SAVE(GPDR3); SAVE(GRER3); SAVE(GFER3); SAVE(PGSR3);
 108         SAVE(GAFR3_L); SAVE(GAFR3_U);
 109         SAVE(PWER); SAVE(PCFR); SAVE(PRER);
 110         SAVE(PFER); SAVE(PKWR);
 111 #endif
 112
 113         SAVE(ICMR);
 114         ICMR = 0;
 115
 116         SAVE(CKEN);
 117         SAVE(PSTR);
 118
 119         /* Note: wake up source are set up in each machine specific files */
 120
 121         /* clear GPIO transition detect  bits */
 122         GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
 123 #ifdef CONFIG_PXA27x
 124         GEDR3 = GEDR3;
 125 #endif
 126
 127         /* Clear sleep reset status */
 128         RCSR = RCSR_SMR;
 129
 130         /* before sleeping, calculate and save a checksum */
 131         for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
 132                 checksum += sleep_save[i];
 133         sleep_save[SLEEP_SAVE_CKSUM] = checksum;
 134
 135         /* *** go zzz *** */
 136         pxa_cpu_pm_enter(state);
 137
 138         cpu_init();
 139
 140         /* after sleeping, validate the checksum */
 141         checksum = 0;
 142         for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
 143                 checksum += sleep_save[i];
 144
 145         /* if invalid, display message and wait for a hardware reset */
 146         if (checksum != sleep_save[SLEEP_SAVE_CKSUM]) {
 147 #ifdef CONFIG_ARCH_LUBBOCK
 148                 LUB_HEXLED = 0xbadbadc5;
 149 #endif
 150                 while (1)
 151                         pxa_cpu_pm_enter(state);
 152         }
 153
 154         /* ensure not to come back here if it wasn't intended */
 155         PSPR = 0;
 156
 157         /* restore registers */
 158         RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
 159         RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2);
 160         RESTORE(GAFR0_L); RESTORE(GAFR0_U);
 161         RESTORE(GAFR1_L); RESTORE(GAFR1_U);
 162         RESTORE(GAFR2_L); RESTORE(GAFR2_U);
 163         RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2);
 164         RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2);
 165         RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
 166
 167 #ifdef CONFIG_PXA27x
 168         RESTORE(MDREFR);
 169         RESTORE_GPLEVEL(3); RESTORE(GPDR3);
 170         RESTORE(GAFR3_L); RESTORE(GAFR3_U);
 171         RESTORE(GRER3); RESTORE(GFER3); RESTORE(PGSR3);
 172         RESTORE(PWER); RESTORE(PCFR); RESTORE(PRER);
 173         RESTORE(PFER); RESTORE(PKWR);
 174 #endif
 175
 176         PSSR = PSSR_RDH | PSSR_PH;
 177
 178         RESTORE(CKEN);
 179
 180         ICLR = 0;
 181         ICCR = 1;
 182         RESTORE(ICMR);
 183
 184         RESTORE(PSTR);
 185
 186         /* restore current time */
 187         rtc.tv_sec = RCNR;
 188         restore_time_delta(&delta, &rtc);
 189
 190 #ifdef DEBUG
 191         printk(KERN_DEBUG "*** made it back from resume\n");
 192 #endif
 193
 194         return 0;
 195 }
 196
 197 EXPORT_SYMBOL_GPL(pxa_pm_enter);
 198
 199 unsigned long sleep_phys_sp(void *sp)
 200 {
 201         return virt_to_phys(sp);
 202 }
 203
 204 /*
 205  * Called after processes are frozen, but before we shut down devices.
 206  */
 207 int pxa_pm_prepare(suspend_state_t state)
 208 {
 209         extern int pxa_cpu_pm_prepare(suspend_state_t state);
 210
 211         return pxa_cpu_pm_prepare(state);
 212 }
 213
 214 EXPORT_SYMBOL_GPL(pxa_pm_prepare);
 215
 216 /*
 217  * Called after devices are re-setup, but before processes are thawed.
 218  */
 219 int pxa_pm_finish(suspend_state_t state)
 220 {
 221         return 0;
 222 }
 223
 224 EXPORT_SYMBOL_GPL(pxa_pm_finish);
 225
 226 /*
 227  * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
 228  */
 229 static struct pm_ops pxa_pm_ops = {
 230         .pm_disk_mode   = PM_DISK_FIRMWARE,
 231         .prepare        = pxa_pm_prepare,
 232         .enter          = pxa_pm_enter,
 233         .finish         = pxa_pm_finish,
 234 };
 235
 236 static int __init pxa_pm_init(void)
 237 {
 238         pm_set_ops(&pxa_pm_ops);
 239         return 0;
 240 }
 241
 242 device_initcall(pxa_pm_init);