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/memory.h> 33 #include <asm/suspend.h> 34 #include <asm/mach/time.h> 35 36 extern int sa1100_finish_suspend(unsigned long); 37 38 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x 39 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x] 40 41 /* 42 * List of global SA11x0 peripheral registers to preserve. 43 * More ones like CP and general purpose register values are preserved 44 * on the stack and then the stack pointer is stored last in sleep.S. 45 */ 46 enum { SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR, 47 SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR, 48 49 SLEEP_SAVE_Ser1SDCR0, 50 51 SLEEP_SAVE_COUNT 52 }; 53 54 55 static int sa11x0_pm_enter(suspend_state_t state) 56 { 57 unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT]; 58 59 gpio = GPLR; 60 61 /* save vital registers */ 62 SAVE(GPDR); 63 SAVE(GAFR); 64 65 SAVE(PPDR); 66 SAVE(PPSR); 67 SAVE(PPAR); 68 SAVE(PSDR); 69 70 SAVE(Ser1SDCR0); 71 72 /* Clear previous reset status */ 73 RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR; 74 75 /* set resume return address */ 76 PSPR = __pa_symbol(cpu_resume); 77 78 /* go zzz */ 79 cpu_suspend(0, sa1100_finish_suspend); 80 81 /* 82 * Ensure not to come back here if it wasn't intended 83 */ 84 RCSR = RCSR_SMR; 85 PSPR = 0; 86 87 /* 88 * Ensure interrupt sources are disabled; we will re-init 89 * the interrupt subsystem via the device manager. 90 */ 91 ICLR = 0; 92 ICCR = 1; 93 ICMR = 0; 94 95 /* restore registers */ 96 RESTORE(GPDR); 97 RESTORE(GAFR); 98 99 RESTORE(PPDR); 100 RESTORE(PPSR); 101 RESTORE(PPAR); 102 RESTORE(PSDR); 103 104 RESTORE(Ser1SDCR0); 105 106 GPSR = gpio; 107 GPCR = ~gpio; 108 109 /* 110 * Clear the peripheral sleep-hold bit. 111 */ 112 PSSR = PSSR_PH; 113 114 return 0; 115 } 116 117 static const struct platform_suspend_ops sa11x0_pm_ops = { 118 .enter = sa11x0_pm_enter, 119 .valid = suspend_valid_only_mem, 120 }; 121 122 int __init sa11x0_pm_init(void) 123 { 124 suspend_set_ops(&sa11x0_pm_ops); 125 return 0; 126 } 127