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 static struct pm_ops pxa_pm_ops = { 227 .prepare = pxa_pm_prepare, 228 .enter = pxa_pm_enter, 229 .finish = pxa_pm_finish, 230 .valid = pm_valid_only_mem, 231 }; 232 233 static int __init pxa_pm_init(void) 234 { 235 pm_set_ops(&pxa_pm_ops); 236 return 0; 237 } 238 239 device_initcall(pxa_pm_init); 240