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/config.h>
  14 #include <linux/init.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/pxa-regs.h>
  23 #include <asm/arch/lubbock.h>
  24 #include <asm/mach/time.h>
  25
  26
  27 /*
  28  * Debug macros
  29  */
  30 #undef DEBUG
  31
  32 extern void pxa_cpu_suspend(void);
  33 extern void pxa_cpu_resume(void);
  34
  35 #define SAVE(x)         sleep_save[SLEEP_SAVE_##x] = x
  36 #define RESTORE(x)      x = sleep_save[SLEEP_SAVE_##x]
  37
  38 #define RESTORE_GPLEVEL(n) do { \
  39         GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \
  40         GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \
  41 } while (0)
  42
  43 /*
  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.
  47  */
  48 enum {  SLEEP_SAVE_START = 0,
  49
  50         SLEEP_SAVE_GPLR0, SLEEP_SAVE_GPLR1, SLEEP_SAVE_GPLR2, SLEEP_SAVE_GPLR3,
  51         SLEEP_SAVE_GPDR0, SLEEP_SAVE_GPDR1, SLEEP_SAVE_GPDR2, SLEEP_SAVE_GPDR3,
  52         SLEEP_SAVE_GRER0, SLEEP_SAVE_GRER1, SLEEP_SAVE_GRER2, SLEEP_SAVE_GRER3,
  53         SLEEP_SAVE_GFER0, SLEEP_SAVE_GFER1, SLEEP_SAVE_GFER2, SLEEP_SAVE_GFER3,
  54         SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2, SLEEP_SAVE_PGSR3,
  55
  56         SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
  57         SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
  58         SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
  59         SLEEP_SAVE_GAFR3_L, SLEEP_SAVE_GAFR3_U,
  60
  61         SLEEP_SAVE_PSTR,
  62
  63         SLEEP_SAVE_ICMR,
  64         SLEEP_SAVE_CKEN,
  65
  66         SLEEP_SAVE_CKSUM,
  67
  68         SLEEP_SAVE_SIZE
  69 };
  70
  71
  72 static int pxa_pm_enter(suspend_state_t state)
  73 {
  74         unsigned long sleep_save[SLEEP_SAVE_SIZE];
  75         unsigned long checksum = 0;
  76         struct timespec delta, rtc;
  77         int i;
  78
  79         if (state != PM_SUSPEND_MEM)
  80                 return -EINVAL;
  81
  82 #ifdef CONFIG_IWMMXT
  83         /* force any iWMMXt context to ram **/
  84         iwmmxt_task_disable(NULL);
  85 #endif
  86
  87         /* preserve current time */
  88         rtc.tv_sec = RCNR;
  89         rtc.tv_nsec = 0;
  90         save_time_delta(&delta, &rtc);
  91
  92         SAVE(GPLR0); SAVE(GPLR1); SAVE(GPLR2);
  93         SAVE(GPDR0); SAVE(GPDR1); SAVE(GPDR2);
  94         SAVE(GRER0); SAVE(GRER1); SAVE(GRER2);
  95         SAVE(GFER0); SAVE(GFER1); SAVE(GFER2);
  96         SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
  97
  98         SAVE(GAFR0_L); SAVE(GAFR0_U);
  99         SAVE(GAFR1_L); SAVE(GAFR1_U);
 100         SAVE(GAFR2_L); SAVE(GAFR2_U);
 101
 102 #ifdef CONFIG_PXA27x
 103         SAVE(GPLR3); SAVE(GPDR3); SAVE(GRER3); SAVE(GFER3); SAVE(PGSR3);
 104         SAVE(GAFR3_L); SAVE(GAFR3_U);
 105 #endif
 106
 107         SAVE(ICMR);
 108         ICMR = 0;
 109
 110         SAVE(CKEN);
 111         CKEN = 0;
 112
 113         SAVE(PSTR);
 114
 115         /* Note: wake up source are set up in each machine specific files */
 116
 117         /* clear GPIO transition detect  bits */
 118         GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
 119 #ifdef CONFIG_PXA27x
 120         GEDR3 = GEDR3;
 121 #endif
 122
 123         /* Clear sleep reset status */
 124         RCSR = RCSR_SMR;
 125
 126         /* set resume return address */
 127         PSPR = virt_to_phys(pxa_cpu_resume);
 128
 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;
 133
 134         /* *** go zzz *** */
 135         pxa_cpu_suspend();
 136
 137         /* after sleeping, validate the checksum */
 138         checksum = 0;
 139         for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++)
 140                 checksum += sleep_save[i];
 141
 142         /* if invalid, display message and wait for a hardware reset */
 143         if (checksum != sleep_save[SLEEP_SAVE_CKSUM]) {
 144 #ifdef CONFIG_ARCH_LUBBOCK
 145                 LUB_HEXLED = 0xbadbadc5;
 146 #endif
 147                 while (1)
 148                         pxa_cpu_suspend();
 149         }
 150
 151         /* ensure not to come back here if it wasn't intended */
 152         PSPR = 0;
 153
 154         /* restore registers */
 155         RESTORE(GAFR0_L); RESTORE(GAFR0_U);
 156         RESTORE(GAFR1_L); RESTORE(GAFR1_U);
 157         RESTORE(GAFR2_L); RESTORE(GAFR2_U);
 158         RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2);
 159         RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2);
 160         RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2);
 161         RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2);
 162         RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
 163
 164 #ifdef CONFIG_PXA27x
 165         RESTORE(GAFR3_L); RESTORE(GAFR3_U); RESTORE_GPLEVEL(3);
 166         RESTORE(GPDR3); RESTORE(GRER3); RESTORE(GFER3); RESTORE(PGSR3);
 167 #endif
 168
 169         PSSR = PSSR_RDH | PSSR_PH;
 170
 171         RESTORE(CKEN);
 172
 173         ICLR = 0;
 174         ICCR = 1;
 175         RESTORE(ICMR);
 176
 177         RESTORE(PSTR);
 178
 179         /* restore current time */
 180         rtc.tv_sec = RCNR;
 181         restore_time_delta(&delta, &rtc);
 182
 183 #ifdef DEBUG
 184         printk(KERN_DEBUG "*** made it back from resume\n");
 185 #endif
 186
 187         return 0;
 188 }
 189
 190 unsigned long sleep_phys_sp(void *sp)
 191 {
 192         return virt_to_phys(sp);
 193 }
 194
 195 /*
 196  * Called after processes are frozen, but before we shut down devices.
 197  */
 198 static int pxa_pm_prepare(suspend_state_t state)
 199 {
 200         return 0;
 201 }
 202
 203 /*
 204  * Called after devices are re-setup, but before processes are thawed.
 205  */
 206 static int pxa_pm_finish(suspend_state_t state)
 207 {
 208         return 0;
 209 }
 210
 211 /*
 212  * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
 213  */
 214 static struct pm_ops pxa_pm_ops = {
 215         .pm_disk_mode   = PM_DISK_FIRMWARE,
 216         .prepare        = pxa_pm_prepare,
 217         .enter          = pxa_pm_enter,
 218         .finish         = pxa_pm_finish,
 219 };
 220
 221 static int __init pxa_pm_init(void)
 222 {
 223         pm_set_ops(&pxa_pm_ops);
 224         return 0;
 225 }
 226
 227 late_initcall(pxa_pm_init);