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/module.h> 16 #include <linux/suspend.h> 17 #include <linux/errno.h> 18 #include <linux/time.h> 19 20 #include <asm/hardware.h> 21 #include <asm/memory.h> 22 #include <asm/system.h> 23 #include <asm/arch/pm.h> 24 #include <asm/arch/pxa-regs.h> 25 #include <asm/arch/lubbock.h> 26 #include <asm/mach/time.h> 27 28 29 /* 30 * Debug macros 31 */ 32 #undef DEBUG 33 34 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x 35 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x] 36 37 #define RESTORE_GPLEVEL(n) do { \ 38 GPSR##n = sleep_save[SLEEP_SAVE_GPLR##n]; \ 39 GPCR##n = ~sleep_save[SLEEP_SAVE_GPLR##n]; \ 40 } while (0) 41 42 /* 43 * List of global PXA peripheral registers to preserve. 44 * More ones like CP and general purpose register values are preserved 45 * with the stack pointer in sleep.S. 46 */ 47 enum { SLEEP_SAVE_START = 0, 48 49 SLEEP_SAVE_GPLR0, SLEEP_SAVE_GPLR1, SLEEP_SAVE_GPLR2, SLEEP_SAVE_GPLR3, 50 SLEEP_SAVE_GPDR0, SLEEP_SAVE_GPDR1, SLEEP_SAVE_GPDR2, SLEEP_SAVE_GPDR3, 51 SLEEP_SAVE_GRER0, SLEEP_SAVE_GRER1, SLEEP_SAVE_GRER2, SLEEP_SAVE_GRER3, 52 SLEEP_SAVE_GFER0, SLEEP_SAVE_GFER1, SLEEP_SAVE_GFER2, SLEEP_SAVE_GFER3, 53 SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2, SLEEP_SAVE_PGSR3, 54 55 SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U, 56 SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U, 57 SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U, 58 SLEEP_SAVE_GAFR3_L, SLEEP_SAVE_GAFR3_U, 59 60 SLEEP_SAVE_PSTR, 61 62 SLEEP_SAVE_ICMR, 63 SLEEP_SAVE_CKEN, 64 65 #ifdef CONFIG_PXA27x 66 SLEEP_SAVE_MDREFR, 67 SLEEP_SAVE_PWER, SLEEP_SAVE_PCFR, SLEEP_SAVE_PRER, 68 SLEEP_SAVE_PFER, SLEEP_SAVE_PKWR, 69 #endif 70 71 SLEEP_SAVE_CKSUM, 72 73 SLEEP_SAVE_SIZE 74 }; 75 76 77 int pxa_pm_enter(suspend_state_t state) 78 { 79 unsigned long sleep_save[SLEEP_SAVE_SIZE]; 80 unsigned long checksum = 0; 81 struct timespec delta, rtc; 82 int i; 83 extern void pxa_cpu_pm_enter(suspend_state_t state); 84 85 #ifdef CONFIG_IWMMXT 86 /* force any iWMMXt context to ram **/ 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(GAFR0_L); RESTORE(GAFR0_U); 159 RESTORE(GAFR1_L); RESTORE(GAFR1_U); 160 RESTORE(GAFR2_L); RESTORE(GAFR2_U); 161 RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2); 162 RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2); 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(GAFR3_L); RESTORE(GAFR3_U); RESTORE_GPLEVEL(3); 170 RESTORE(GPDR3); RESTORE(GRER3); RESTORE(GFER3); RESTORE(PGSR3); 171 RESTORE(PWER); RESTORE(PCFR); RESTORE(PRER); 172 RESTORE(PFER); RESTORE(PKWR); 173 #endif 174 175 PSSR = PSSR_RDH | PSSR_PH; 176 177 RESTORE(CKEN); 178 179 ICLR = 0; 180 ICCR = 1; 181 RESTORE(ICMR); 182 183 RESTORE(PSTR); 184 185 /* restore current time */ 186 rtc.tv_sec = RCNR; 187 restore_time_delta(&delta, &rtc); 188 189 #ifdef DEBUG 190 printk(KERN_DEBUG "*** made it back from resume\n"); 191 #endif 192 193 return 0; 194 } 195 196 EXPORT_SYMBOL_GPL(pxa_pm_enter); 197 198 unsigned long sleep_phys_sp(void *sp) 199 { 200 return virt_to_phys(sp); 201 } 202 203 /* 204 * Called after processes are frozen, but before we shut down devices. 205 */ 206 int pxa_pm_prepare(suspend_state_t state) 207 { 208 extern int pxa_cpu_pm_prepare(suspend_state_t state); 209 210 return pxa_cpu_pm_prepare(state); 211 } 212 213 EXPORT_SYMBOL_GPL(pxa_pm_prepare); 214 215 /* 216 * Called after devices are re-setup, but before processes are thawed. 217 */ 218 int pxa_pm_finish(suspend_state_t state) 219 { 220 return 0; 221 } 222 223 EXPORT_SYMBOL_GPL(pxa_pm_finish); 224 225 /* 226 * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk. 227 */ 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, 233 }; 234 235 static int __init pxa_pm_init(void) 236 { 237 pm_set_ops(&pxa_pm_ops); 238 return 0; 239 } 240 241 device_initcall(pxa_pm_init); 242