1 /* 2 * SA1100 Power Management Routines 3 * 4 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License. 8 * 9 * History: 10 * 11 * 2001-02-06: Cliff Brake Initial code 12 * 13 * 2001-02-25: Sukjae Cho <sjcho@east.isi.edu> & 14 * Chester Kuo <chester@linux.org.tw> 15 * Save more value for the resume function! Support 16 * Bitsy/Assabet/Freebird board 17 * 18 * 2001-08-29: Nicolas Pitre <nico@fluxnic.net> 19 * Cleaned up, pushed platform dependent stuff 20 * in the platform specific files. 21 * 22 * 2002-05-27: Nicolas Pitre Killed sleep.h and the kmalloced save array. 23 * Storage is local on the stack now. 24 */ 25 #include <linux/init.h> 26 #include <linux/io.h> 27 #include <linux/suspend.h> 28 #include <linux/errno.h> 29 #include <linux/time.h> 30 31 #include <mach/hardware.h> 32 #include <asm/page.h> 33 #include <asm/suspend.h> 34 #include <asm/mach/time.h> 35 36 #include "generic.h" 37 38 extern int sa1100_finish_suspend(unsigned long); 39 40 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x 41 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x] 42 43 /* 44 * List of global SA11x0 peripheral registers to preserve. 45 * More ones like CP and general purpose register values are preserved 46 * on the stack and then the stack pointer is stored last in sleep.S. 47 */ 48 enum { SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR, 49 SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR, 50 51 SLEEP_SAVE_Ser1SDCR0, 52 53 SLEEP_SAVE_COUNT 54 }; 55 56 57 static int sa11x0_pm_enter(suspend_state_t state) 58 { 59 unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT]; 60 61 gpio = GPLR; 62 63 /* save vital registers */ 64 SAVE(GPDR); 65 SAVE(GAFR); 66 67 SAVE(PPDR); 68 SAVE(PPSR); 69 SAVE(PPAR); 70 SAVE(PSDR); 71 72 SAVE(Ser1SDCR0); 73 74 /* Clear previous reset status */ 75 RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR; 76 77 /* set resume return address */ 78 PSPR = __pa_symbol(cpu_resume); 79 80 /* go zzz */ 81 cpu_suspend(0, sa1100_finish_suspend); 82 83 /* 84 * Ensure not to come back here if it wasn't intended 85 */ 86 RCSR = RCSR_SMR; 87 PSPR = 0; 88 89 /* 90 * Ensure interrupt sources are disabled; we will re-init 91 * the interrupt subsystem via the device manager. 92 */ 93 ICLR = 0; 94 ICCR = 1; 95 ICMR = 0; 96 97 /* restore registers */ 98 RESTORE(GPDR); 99 RESTORE(GAFR); 100 101 RESTORE(PPDR); 102 RESTORE(PPSR); 103 RESTORE(PPAR); 104 RESTORE(PSDR); 105 106 RESTORE(Ser1SDCR0); 107 108 GPSR = gpio; 109 GPCR = ~gpio; 110 111 /* 112 * Clear the peripheral sleep-hold bit. 113 */ 114 PSSR = PSSR_PH; 115 116 return 0; 117 } 118 119 static const struct platform_suspend_ops sa11x0_pm_ops = { 120 .enter = sa11x0_pm_enter, 121 .valid = suspend_valid_only_mem, 122 }; 123 124 int __init sa11x0_pm_init(void) 125 { 126 suspend_set_ops(&sa11x0_pm_ops); 127 return 0; 128 } 129