Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/init.h> |
Richard Purdie | 756c7b7 | 2005-11-06 15:03:23 +0000 | [diff] [blame] | 14 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Richard Purdie | 756c7b7 | 2005-11-06 15:03:23 +0000 | [diff] [blame] | 22 | #include <asm/arch/pm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Todd Poynor | 8775420 | 2005-06-03 20:52:27 +0100 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | SLEEP_SAVE_CKSUM, |
| 71 | |
| 72 | SLEEP_SAVE_SIZE |
| 73 | }; |
| 74 | |
| 75 | |
Richard Purdie | 756c7b7 | 2005-11-06 15:03:23 +0000 | [diff] [blame] | 76 | int pxa_pm_enter(suspend_state_t state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
| 78 | unsigned long sleep_save[SLEEP_SAVE_SIZE]; |
| 79 | unsigned long checksum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | int i; |
Todd Poynor | 8775420 | 2005-06-03 20:52:27 +0100 | [diff] [blame] | 81 | extern void pxa_cpu_pm_enter(suspend_state_t state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
| 83 | #ifdef CONFIG_IWMMXT |
| 84 | /* force any iWMMXt context to ram **/ |
Lennert Buytenhek | afe4b25 | 2006-12-03 18:51:14 +0100 | [diff] [blame] | 85 | if (elf_hwcap & HWCAP_IWMMXT) |
| 86 | iwmmxt_task_disable(NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | #endif |
| 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | SAVE(GPLR0); SAVE(GPLR1); SAVE(GPLR2); |
| 90 | SAVE(GPDR0); SAVE(GPDR1); SAVE(GPDR2); |
| 91 | SAVE(GRER0); SAVE(GRER1); SAVE(GRER2); |
| 92 | SAVE(GFER0); SAVE(GFER1); SAVE(GFER2); |
| 93 | SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2); |
| 94 | |
| 95 | SAVE(GAFR0_L); SAVE(GAFR0_U); |
| 96 | SAVE(GAFR1_L); SAVE(GAFR1_U); |
| 97 | SAVE(GAFR2_L); SAVE(GAFR2_U); |
| 98 | |
| 99 | #ifdef CONFIG_PXA27x |
Todd Poynor | 8775420 | 2005-06-03 20:52:27 +0100 | [diff] [blame] | 100 | SAVE(MDREFR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | SAVE(GPLR3); SAVE(GPDR3); SAVE(GRER3); SAVE(GFER3); SAVE(PGSR3); |
| 102 | SAVE(GAFR3_L); SAVE(GAFR3_U); |
Todd Poynor | 8775420 | 2005-06-03 20:52:27 +0100 | [diff] [blame] | 103 | SAVE(PWER); SAVE(PCFR); SAVE(PRER); |
| 104 | SAVE(PFER); SAVE(PKWR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #endif |
| 106 | |
| 107 | SAVE(ICMR); |
| 108 | ICMR = 0; |
| 109 | |
| 110 | SAVE(CKEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | SAVE(PSTR); |
| 112 | |
| 113 | /* Note: wake up source are set up in each machine specific files */ |
| 114 | |
| 115 | /* clear GPIO transition detect bits */ |
| 116 | GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2; |
| 117 | #ifdef CONFIG_PXA27x |
| 118 | GEDR3 = GEDR3; |
| 119 | #endif |
| 120 | |
| 121 | /* Clear sleep reset status */ |
| 122 | RCSR = RCSR_SMR; |
| 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | /* before sleeping, calculate and save a checksum */ |
| 125 | for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++) |
| 126 | checksum += sleep_save[i]; |
| 127 | sleep_save[SLEEP_SAVE_CKSUM] = checksum; |
| 128 | |
| 129 | /* *** go zzz *** */ |
Todd Poynor | 8775420 | 2005-06-03 20:52:27 +0100 | [diff] [blame] | 130 | pxa_cpu_pm_enter(state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Russell King | 36c5ed2 | 2005-06-19 18:39:33 +0100 | [diff] [blame] | 132 | cpu_init(); |
| 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | /* after sleeping, validate the checksum */ |
| 135 | checksum = 0; |
| 136 | for (i = 0; i < SLEEP_SAVE_SIZE - 1; i++) |
| 137 | checksum += sleep_save[i]; |
| 138 | |
| 139 | /* if invalid, display message and wait for a hardware reset */ |
| 140 | if (checksum != sleep_save[SLEEP_SAVE_CKSUM]) { |
| 141 | #ifdef CONFIG_ARCH_LUBBOCK |
| 142 | LUB_HEXLED = 0xbadbadc5; |
| 143 | #endif |
| 144 | while (1) |
Todd Poynor | 8775420 | 2005-06-03 20:52:27 +0100 | [diff] [blame] | 145 | pxa_cpu_pm_enter(state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | /* ensure not to come back here if it wasn't intended */ |
| 149 | PSPR = 0; |
| 150 | |
| 151 | /* restore registers */ |
Lothar Wassmann | 1ee9530 | 2005-12-12 16:44:05 +0000 | [diff] [blame] | 152 | RESTORE_GPLEVEL(0); RESTORE_GPLEVEL(1); RESTORE_GPLEVEL(2); |
| 153 | RESTORE(GPDR0); RESTORE(GPDR1); RESTORE(GPDR2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | RESTORE(GAFR0_L); RESTORE(GAFR0_U); |
| 155 | RESTORE(GAFR1_L); RESTORE(GAFR1_U); |
| 156 | RESTORE(GAFR2_L); RESTORE(GAFR2_U); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | RESTORE(GRER0); RESTORE(GRER1); RESTORE(GRER2); |
| 158 | RESTORE(GFER0); RESTORE(GFER1); RESTORE(GFER2); |
| 159 | RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2); |
| 160 | |
| 161 | #ifdef CONFIG_PXA27x |
Todd Poynor | 8775420 | 2005-06-03 20:52:27 +0100 | [diff] [blame] | 162 | RESTORE(MDREFR); |
Lothar Wassmann | 1ee9530 | 2005-12-12 16:44:05 +0000 | [diff] [blame] | 163 | RESTORE_GPLEVEL(3); RESTORE(GPDR3); |
| 164 | RESTORE(GAFR3_L); RESTORE(GAFR3_U); |
| 165 | RESTORE(GRER3); RESTORE(GFER3); RESTORE(PGSR3); |
Todd Poynor | 8775420 | 2005-06-03 20:52:27 +0100 | [diff] [blame] | 166 | RESTORE(PWER); RESTORE(PCFR); RESTORE(PRER); |
| 167 | RESTORE(PFER); RESTORE(PKWR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | #endif |
| 169 | |
| 170 | PSSR = PSSR_RDH | PSSR_PH; |
| 171 | |
| 172 | RESTORE(CKEN); |
| 173 | |
| 174 | ICLR = 0; |
| 175 | ICCR = 1; |
| 176 | RESTORE(ICMR); |
| 177 | |
| 178 | RESTORE(PSTR); |
| 179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | #ifdef DEBUG |
| 181 | printk(KERN_DEBUG "*** made it back from resume\n"); |
| 182 | #endif |
| 183 | |
| 184 | return 0; |
| 185 | } |
| 186 | |
Richard Purdie | 756c7b7 | 2005-11-06 15:03:23 +0000 | [diff] [blame] | 187 | EXPORT_SYMBOL_GPL(pxa_pm_enter); |
| 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | unsigned long sleep_phys_sp(void *sp) |
| 190 | { |
| 191 | return virt_to_phys(sp); |
| 192 | } |