1 /* 2 * arch/sh/kernel/cpu/shmobile/pm.c 3 * 4 * Power management support code for SuperH Mobile 5 * 6 * Copyright (C) 2009 Magnus Damm 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file "COPYING" in the main directory of this archive 10 * for more details. 11 */ 12 #include <linux/init.h> 13 #include <linux/kernel.h> 14 #include <linux/io.h> 15 #include <linux/suspend.h> 16 #include <asm/suspend.h> 17 #include <asm/uaccess.h> 18 #include <asm/cacheflush.h> 19 20 /* 21 * Notifier lists for pre/post sleep notification 22 */ 23 ATOMIC_NOTIFIER_HEAD(sh_mobile_pre_sleep_notifier_list); 24 ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list); 25 26 /* 27 * Sleep modes available on SuperH Mobile: 28 * 29 * Sleep mode is just plain "sleep" instruction 30 * Sleep Self-Refresh mode is above plus RAM put in Self-Refresh 31 * Standby Self-Refresh mode is above plus stopped clocks 32 */ 33 #define SUSP_MODE_SLEEP (SUSP_SH_SLEEP) 34 #define SUSP_MODE_SLEEP_SF (SUSP_SH_SLEEP | SUSP_SH_SF) 35 #define SUSP_MODE_STANDBY_SF (SUSP_SH_STANDBY | SUSP_SH_SF) 36 #define SUSP_MODE_RSTANDBY_SF \ 37 (SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_REGS | SUSP_SH_SF) 38 /* 39 * U-standby mode is unsupported since it needs bootloader hacks 40 */ 41 42 #ifdef CONFIG_CPU_SUBTYPE_SH7724 43 #define RAM_BASE 0xfd800000 /* RSMEM */ 44 #else 45 #define RAM_BASE 0xe5200000 /* ILRAM */ 46 #endif 47 48 void sh_mobile_call_standby(unsigned long mode) 49 { 50 void *onchip_mem = (void *)RAM_BASE; 51 struct sh_sleep_data *sdp = onchip_mem; 52 void (*standby_onchip_mem)(unsigned long, unsigned long); 53 54 /* code located directly after data structure */ 55 standby_onchip_mem = (void *)(sdp + 1); 56 57 atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list, 58 mode, NULL); 59 60 /* flush the caches if MMU flag is set */ 61 if (mode & SUSP_SH_MMU) 62 flush_cache_all(); 63 64 /* Let assembly snippet in on-chip memory handle the rest */ 65 standby_onchip_mem(mode, RAM_BASE); 66 67 atomic_notifier_call_chain(&sh_mobile_post_sleep_notifier_list, 68 mode, NULL); 69 } 70 71 extern char sh_mobile_sleep_enter_start; 72 extern char sh_mobile_sleep_enter_end; 73 74 extern char sh_mobile_sleep_resume_start; 75 extern char sh_mobile_sleep_resume_end; 76 77 unsigned long sh_mobile_sleep_supported = SUSP_SH_SLEEP; 78 79 void sh_mobile_register_self_refresh(unsigned long flags, 80 void *pre_start, void *pre_end, 81 void *post_start, void *post_end) 82 { 83 void *onchip_mem = (void *)RAM_BASE; 84 void *vp; 85 struct sh_sleep_data *sdp; 86 int n; 87 88 /* part 0: data area */ 89 sdp = onchip_mem; 90 sdp->addr.stbcr = 0xa4150020; /* STBCR */ 91 sdp->addr.bar = 0xa4150040; /* BAR */ 92 sdp->addr.pteh = 0xff000000; /* PTEH */ 93 sdp->addr.ptel = 0xff000004; /* PTEL */ 94 sdp->addr.ttb = 0xff000008; /* TTB */ 95 sdp->addr.tea = 0xff00000c; /* TEA */ 96 sdp->addr.mmucr = 0xff000010; /* MMUCR */ 97 sdp->addr.ptea = 0xff000034; /* PTEA */ 98 sdp->addr.pascr = 0xff000070; /* PASCR */ 99 sdp->addr.irmcr = 0xff000078; /* IRMCR */ 100 sdp->addr.ccr = 0xff00001c; /* CCR */ 101 sdp->addr.ramcr = 0xff000074; /* RAMCR */ 102 vp = sdp + 1; 103 104 /* part 1: common code to enter sleep mode */ 105 n = &sh_mobile_sleep_enter_end - &sh_mobile_sleep_enter_start; 106 memcpy(vp, &sh_mobile_sleep_enter_start, n); 107 vp += roundup(n, 4); 108 109 /* part 2: board specific code to enter self-refresh mode */ 110 n = pre_end - pre_start; 111 memcpy(vp, pre_start, n); 112 sdp->sf_pre = (unsigned long)vp; 113 vp += roundup(n, 4); 114 115 /* part 3: board specific code to resume from self-refresh mode */ 116 n = post_end - post_start; 117 memcpy(vp, post_start, n); 118 sdp->sf_post = (unsigned long)vp; 119 vp += roundup(n, 4); 120 121 /* part 4: common code to resume from sleep mode */ 122 WARN_ON(vp > (onchip_mem + 0x600)); 123 vp = onchip_mem + 0x600; /* located at interrupt vector */ 124 n = &sh_mobile_sleep_resume_end - &sh_mobile_sleep_resume_start; 125 memcpy(vp, &sh_mobile_sleep_resume_start, n); 126 sdp->resume = (unsigned long)vp; 127 128 sh_mobile_sleep_supported |= flags; 129 } 130 131 static int sh_pm_enter(suspend_state_t state) 132 { 133 if (!(sh_mobile_sleep_supported & SUSP_MODE_STANDBY_SF)) 134 return -ENXIO; 135 136 local_irq_disable(); 137 set_bl_bit(); 138 sh_mobile_call_standby(SUSP_MODE_STANDBY_SF); 139 local_irq_disable(); 140 clear_bl_bit(); 141 return 0; 142 } 143 144 static const struct platform_suspend_ops sh_pm_ops = { 145 .enter = sh_pm_enter, 146 .valid = suspend_valid_only_mem, 147 }; 148 149 static int __init sh_pm_init(void) 150 { 151 suspend_set_ops(&sh_pm_ops); 152 sh_mobile_setup_cpuidle(); 153 return 0; 154 } 155 156 late_initcall(sh_pm_init); 157