1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * arch/sh/kernel/cpu/shmobile/pm.c 4 * 5 * Power management support code for SuperH Mobile 6 * 7 * Copyright (C) 2009 Magnus Damm 8 */ 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/io.h> 12 #include <linux/suspend.h> 13 #include <asm/suspend.h> 14 #include <linux/uaccess.h> 15 #include <asm/cacheflush.h> 16 #include <asm/bl_bit.h> 17 18 /* 19 * Notifier lists for pre/post sleep notification 20 */ 21 ATOMIC_NOTIFIER_HEAD(sh_mobile_pre_sleep_notifier_list); 22 ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list); 23 24 /* 25 * Sleep modes available on SuperH Mobile: 26 * 27 * Sleep mode is just plain "sleep" instruction 28 * Sleep Self-Refresh mode is above plus RAM put in Self-Refresh 29 * Standby Self-Refresh mode is above plus stopped clocks 30 */ 31 #define SUSP_MODE_SLEEP (SUSP_SH_SLEEP) 32 #define SUSP_MODE_SLEEP_SF (SUSP_SH_SLEEP | SUSP_SH_SF) 33 #define SUSP_MODE_STANDBY_SF (SUSP_SH_STANDBY | SUSP_SH_SF) 34 #define SUSP_MODE_RSTANDBY_SF \ 35 (SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_REGS | SUSP_SH_SF) 36 /* 37 * U-standby mode is unsupported since it needs bootloader hacks 38 */ 39 40 #ifdef CONFIG_CPU_SUBTYPE_SH7724 41 #define RAM_BASE 0xfd800000 /* RSMEM */ 42 #else 43 #define RAM_BASE 0xe5200000 /* ILRAM */ 44 #endif 45 sh_mobile_call_standby(unsigned long mode)46 void sh_mobile_call_standby(unsigned long mode) 47 { 48 void *onchip_mem = (void *)RAM_BASE; 49 struct sh_sleep_data *sdp = onchip_mem; 50 void (*standby_onchip_mem)(unsigned long, unsigned long); 51 52 /* code located directly after data structure */ 53 standby_onchip_mem = (void *)(sdp + 1); 54 55 atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list, 56 mode, NULL); 57 58 /* flush the caches if MMU flag is set */ 59 if (mode & SUSP_SH_MMU) 60 flush_cache_all(); 61 62 /* Let assembly snippet in on-chip memory handle the rest */ 63 standby_onchip_mem(mode, RAM_BASE); 64 65 atomic_notifier_call_chain(&sh_mobile_post_sleep_notifier_list, 66 mode, NULL); 67 } 68 69 extern char sh_mobile_sleep_enter_start; 70 extern char sh_mobile_sleep_enter_end; 71 72 extern char sh_mobile_sleep_resume_start; 73 extern char sh_mobile_sleep_resume_end; 74 75 unsigned long sh_mobile_sleep_supported = SUSP_SH_SLEEP; 76 sh_mobile_register_self_refresh(unsigned long flags,void * pre_start,void * pre_end,void * post_start,void * post_end)77 void sh_mobile_register_self_refresh(unsigned long flags, 78 void *pre_start, void *pre_end, 79 void *post_start, void *post_end) 80 { 81 void *onchip_mem = (void *)RAM_BASE; 82 void *vp; 83 struct sh_sleep_data *sdp; 84 int n; 85 86 /* part 0: data area */ 87 sdp = onchip_mem; 88 sdp->addr.stbcr = 0xa4150020; /* STBCR */ 89 sdp->addr.bar = 0xa4150040; /* BAR */ 90 sdp->addr.pteh = 0xff000000; /* PTEH */ 91 sdp->addr.ptel = 0xff000004; /* PTEL */ 92 sdp->addr.ttb = 0xff000008; /* TTB */ 93 sdp->addr.tea = 0xff00000c; /* TEA */ 94 sdp->addr.mmucr = 0xff000010; /* MMUCR */ 95 sdp->addr.ptea = 0xff000034; /* PTEA */ 96 sdp->addr.pascr = 0xff000070; /* PASCR */ 97 sdp->addr.irmcr = 0xff000078; /* IRMCR */ 98 sdp->addr.ccr = 0xff00001c; /* CCR */ 99 sdp->addr.ramcr = 0xff000074; /* RAMCR */ 100 vp = sdp + 1; 101 102 /* part 1: common code to enter sleep mode */ 103 n = &sh_mobile_sleep_enter_end - &sh_mobile_sleep_enter_start; 104 memcpy(vp, &sh_mobile_sleep_enter_start, n); 105 vp += roundup(n, 4); 106 107 /* part 2: board specific code to enter self-refresh mode */ 108 n = pre_end - pre_start; 109 memcpy(vp, pre_start, n); 110 sdp->sf_pre = (unsigned long)vp; 111 vp += roundup(n, 4); 112 113 /* part 3: board specific code to resume from self-refresh mode */ 114 n = post_end - post_start; 115 memcpy(vp, post_start, n); 116 sdp->sf_post = (unsigned long)vp; 117 vp += roundup(n, 4); 118 119 /* part 4: common code to resume from sleep mode */ 120 WARN_ON(vp > (onchip_mem + 0x600)); 121 vp = onchip_mem + 0x600; /* located at interrupt vector */ 122 n = &sh_mobile_sleep_resume_end - &sh_mobile_sleep_resume_start; 123 memcpy(vp, &sh_mobile_sleep_resume_start, n); 124 sdp->resume = (unsigned long)vp; 125 126 sh_mobile_sleep_supported |= flags; 127 } 128 sh_pm_enter(suspend_state_t state)129 static int sh_pm_enter(suspend_state_t state) 130 { 131 if (!(sh_mobile_sleep_supported & SUSP_MODE_STANDBY_SF)) 132 return -ENXIO; 133 134 local_irq_disable(); 135 set_bl_bit(); 136 sh_mobile_call_standby(SUSP_MODE_STANDBY_SF); 137 local_irq_disable(); 138 clear_bl_bit(); 139 return 0; 140 } 141 142 static const struct platform_suspend_ops sh_pm_ops = { 143 .enter = sh_pm_enter, 144 .valid = suspend_valid_only_mem, 145 }; 146 sh_pm_init(void)147 static int __init sh_pm_init(void) 148 { 149 suspend_set_ops(&sh_pm_ops); 150 return sh_mobile_setup_cpuidle(); 151 } 152 153 late_initcall(sh_pm_init); 154