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 (SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_SF) 37 /* 38 * U-standby mode is unsupported since it needs bootloader hacks 39 */ 40 41 #ifdef CONFIG_CPU_SUBTYPE_SH7724 42 #define RAM_BASE 0xfd800000 /* RSMEM */ 43 #else 44 #define RAM_BASE 0xe5200000 /* ILRAM */ 45 #endif 46 47 void sh_mobile_call_standby(unsigned long mode) 48 { 49 void *onchip_mem = (void *)RAM_BASE; 50 struct sh_sleep_data *sdp = onchip_mem; 51 void (*standby_onchip_mem)(unsigned long, unsigned long); 52 53 /* code located directly after data structure */ 54 standby_onchip_mem = (void *)(sdp + 1); 55 56 atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list, 57 mode, NULL); 58 59 /* flush the caches if MMU flag is set */ 60 if (mode & SUSP_SH_MMU) 61 flush_cache_all(); 62 63 /* Let assembly snippet in on-chip memory handle the rest */ 64 standby_onchip_mem(mode, RAM_BASE); 65 66 atomic_notifier_call_chain(&sh_mobile_post_sleep_notifier_list, 67 mode, NULL); 68 } 69 70 extern char sh_mobile_sleep_enter_start; 71 extern char sh_mobile_sleep_enter_end; 72 73 extern char sh_mobile_sleep_resume_start; 74 extern char sh_mobile_sleep_resume_end; 75 76 unsigned long sh_mobile_sleep_supported = SUSP_SH_SLEEP; 77 78 void sh_mobile_register_self_refresh(unsigned long flags, 79 void *pre_start, void *pre_end, 80 void *post_start, void *post_end) 81 { 82 void *onchip_mem = (void *)RAM_BASE; 83 void *vp; 84 struct sh_sleep_data *sdp; 85 int n; 86 87 /* part 0: data area */ 88 sdp = onchip_mem; 89 sdp->addr.stbcr = 0xa4150020; /* STBCR */ 90 sdp->addr.bar = 0xa4150040; /* BAR */ 91 sdp->addr.pteh = 0xff000000; /* PTEH */ 92 sdp->addr.ptel = 0xff000004; /* PTEL */ 93 sdp->addr.ttb = 0xff000008; /* TTB */ 94 sdp->addr.tea = 0xff00000c; /* TEA */ 95 sdp->addr.mmucr = 0xff000010; /* MMUCR */ 96 sdp->addr.ptea = 0xff000034; /* PTEA */ 97 sdp->addr.pascr = 0xff000070; /* PASCR */ 98 sdp->addr.irmcr = 0xff000078; /* IRMCR */ 99 sdp->addr.ccr = 0xff00001c; /* CCR */ 100 sdp->addr.ramcr = 0xff000074; /* RAMCR */ 101 vp = sdp + 1; 102 103 /* part 1: common code to enter sleep mode */ 104 n = &sh_mobile_sleep_enter_end - &sh_mobile_sleep_enter_start; 105 memcpy(vp, &sh_mobile_sleep_enter_start, n); 106 vp += roundup(n, 4); 107 108 /* part 2: board specific code to enter self-refresh mode */ 109 n = pre_end - pre_start; 110 memcpy(vp, pre_start, n); 111 sdp->sf_pre = (unsigned long)vp; 112 vp += roundup(n, 4); 113 114 /* part 3: board specific code to resume from self-refresh mode */ 115 n = post_end - post_start; 116 memcpy(vp, post_start, n); 117 sdp->sf_post = (unsigned long)vp; 118 vp += roundup(n, 4); 119 120 /* part 4: common code to resume from sleep mode */ 121 WARN_ON(vp > (onchip_mem + 0x600)); 122 vp = onchip_mem + 0x600; /* located at interrupt vector */ 123 n = &sh_mobile_sleep_resume_end - &sh_mobile_sleep_resume_start; 124 memcpy(vp, &sh_mobile_sleep_resume_start, n); 125 sdp->resume = (unsigned long)vp; 126 127 sh_mobile_sleep_supported |= flags; 128 } 129 130 static int sh_pm_enter(suspend_state_t state) 131 { 132 if (!(sh_mobile_sleep_supported & SUSP_MODE_STANDBY_SF)) 133 return -ENXIO; 134 135 local_irq_disable(); 136 set_bl_bit(); 137 sh_mobile_call_standby(SUSP_MODE_STANDBY_SF); 138 local_irq_disable(); 139 clear_bl_bit(); 140 return 0; 141 } 142 143 static struct platform_suspend_ops sh_pm_ops = { 144 .enter = sh_pm_enter, 145 .valid = suspend_valid_only_mem, 146 }; 147 148 static int __init sh_pm_init(void) 149 { 150 suspend_set_ops(&sh_pm_ops); 151 sh_mobile_setup_cpuidle(); 152 return 0; 153 } 154 155 late_initcall(sh_pm_init); 156