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