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@cam.org> 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/suspend.h> 27#include <linux/errno.h> 28#include <linux/time.h> 29 30#include <asm/hardware.h> 31#include <asm/memory.h> 32#include <asm/system.h> 33#include <asm/mach/time.h> 34 35extern void sa1100_cpu_suspend(void); 36extern void sa1100_cpu_resume(void); 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 */ 46enum { SLEEP_SAVE_SP = 0, 47 48 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_SIZE 54}; 55 56 57static int sa11x0_pm_enter(suspend_state_t state) 58{ 59 unsigned long gpio, sleep_save[SLEEP_SAVE_SIZE]; 60 struct timespec delta, rtc; 61 62 /* preserve current time */ 63 rtc.tv_sec = RCNR; 64 rtc.tv_nsec = 0; 65 save_time_delta(&delta, &rtc); 66 gpio = GPLR; 67 68 /* save vital registers */ 69 SAVE(GPDR); 70 SAVE(GAFR); 71 72 SAVE(PPDR); 73 SAVE(PPSR); 74 SAVE(PPAR); 75 SAVE(PSDR); 76 77 SAVE(Ser1SDCR0); 78 79 /* Clear previous reset status */ 80 RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR; 81 82 /* set resume return address */ 83 PSPR = virt_to_phys(sa1100_cpu_resume); 84 85 /* go zzz */ 86 sa1100_cpu_suspend(); 87 88 cpu_init(); 89 90 /* 91 * Ensure not to come back here if it wasn't intended 92 */ 93 PSPR = 0; 94 95 /* 96 * Ensure interrupt sources are disabled; we will re-init 97 * the interrupt subsystem via the device manager. 98 */ 99 ICLR = 0; 100 ICCR = 1; 101 ICMR = 0; 102 103 /* restore registers */ 104 RESTORE(GPDR); 105 RESTORE(GAFR); 106 107 RESTORE(PPDR); 108 RESTORE(PPSR); 109 RESTORE(PPAR); 110 RESTORE(PSDR); 111 112 RESTORE(Ser1SDCR0); 113 114 GPSR = gpio; 115 GPCR = ~gpio; 116 117 /* 118 * Clear the peripheral sleep-hold bit. 119 */ 120 PSSR = PSSR_PH; 121 122 /* restore current time */ 123 rtc.tv_sec = RCNR; 124 restore_time_delta(&delta, &rtc); 125 126 return 0; 127} 128 129unsigned long sleep_phys_sp(void *sp) 130{ 131 return virt_to_phys(sp); 132} 133 134static struct pm_ops sa11x0_pm_ops = { 135 .enter = sa11x0_pm_enter, 136 .valid = pm_valid_only_mem, 137}; 138 139static int __init sa11x0_pm_init(void) 140{ 141 pm_set_ops(&sa11x0_pm_ops); 142 return 0; 143} 144 145late_initcall(sa11x0_pm_init); 146