/* * arch/sh/kernel/cpu/shmobile/pm.c * * Power management support code for SuperH Mobile * * Copyright (C) 2009 Magnus Damm * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/io.h> #include <linux/suspend.h> #include <asm/suspend.h> #include <asm/uaccess.h> #include <asm/cacheflush.h> #include <asm/bl_bit.h> /* * Notifier lists for pre/post sleep notification */ ATOMIC_NOTIFIER_HEAD(sh_mobile_pre_sleep_notifier_list); ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list); /* * Sleep modes available on SuperH Mobile: * * Sleep mode is just plain "sleep" instruction * Sleep Self-Refresh mode is above plus RAM put in Self-Refresh * Standby Self-Refresh mode is above plus stopped clocks */ #define SUSP_MODE_SLEEP (SUSP_SH_SLEEP) #define SUSP_MODE_SLEEP_SF (SUSP_SH_SLEEP | SUSP_SH_SF) #define SUSP_MODE_STANDBY_SF (SUSP_SH_STANDBY | SUSP_SH_SF) #define SUSP_MODE_RSTANDBY_SF \ (SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_REGS | SUSP_SH_SF) /* * U-standby mode is unsupported since it needs bootloader hacks */ #ifdef CONFIG_CPU_SUBTYPE_SH7724 #define RAM_BASE 0xfd800000 /* RSMEM */ #else #define RAM_BASE 0xe5200000 /* ILRAM */ #endif void sh_mobile_call_standby(unsigned long mode) { void *onchip_mem = (void *)RAM_BASE; struct sh_sleep_data *sdp = onchip_mem; void (*standby_onchip_mem)(unsigned long, unsigned long); /* code located directly after data structure */ standby_onchip_mem = (void *)(sdp + 1); atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list, mode, NULL); /* flush the caches if MMU flag is set */ if (mode & SUSP_SH_MMU) flush_cache_all(); /* Let assembly snippet in on-chip memory handle the rest */ standby_onchip_mem(mode, RAM_BASE); atomic_notifier_call_chain(&sh_mobile_post_sleep_notifier_list, mode, NULL); } extern char sh_mobile_sleep_enter_start; extern char sh_mobile_sleep_enter_end; extern char sh_mobile_sleep_resume_start; extern char sh_mobile_sleep_resume_end; unsigned long sh_mobile_sleep_supported = SUSP_SH_SLEEP; void sh_mobile_register_self_refresh(unsigned long flags, void *pre_start, void *pre_end, void *post_start, void *post_end) { void *onchip_mem = (void *)RAM_BASE; void *vp; struct sh_sleep_data *sdp; int n; /* part 0: data area */ sdp = onchip_mem; sdp->addr.stbcr = 0xa4150020; /* STBCR */ sdp->addr.bar = 0xa4150040; /* BAR */ sdp->addr.pteh = 0xff000000; /* PTEH */ sdp->addr.ptel = 0xff000004; /* PTEL */ sdp->addr.ttb = 0xff000008; /* TTB */ sdp->addr.tea = 0xff00000c; /* TEA */ sdp->addr.mmucr = 0xff000010; /* MMUCR */ sdp->addr.ptea = 0xff000034; /* PTEA */ sdp->addr.pascr = 0xff000070; /* PASCR */ sdp->addr.irmcr = 0xff000078; /* IRMCR */ sdp->addr.ccr = 0xff00001c; /* CCR */ sdp->addr.ramcr = 0xff000074; /* RAMCR */ vp = sdp + 1; /* part 1: common code to enter sleep mode */ n = &sh_mobile_sleep_enter_end - &sh_mobile_sleep_enter_start; memcpy(vp, &sh_mobile_sleep_enter_start, n); vp += roundup(n, 4); /* part 2: board specific code to enter self-refresh mode */ n = pre_end - pre_start; memcpy(vp, pre_start, n); sdp->sf_pre = (unsigned long)vp; vp += roundup(n, 4); /* part 3: board specific code to resume from self-refresh mode */ n = post_end - post_start; memcpy(vp, post_start, n); sdp->sf_post = (unsigned long)vp; vp += roundup(n, 4); /* part 4: common code to resume from sleep mode */ WARN_ON(vp > (onchip_mem + 0x600)); vp = onchip_mem + 0x600; /* located at interrupt vector */ n = &sh_mobile_sleep_resume_end - &sh_mobile_sleep_resume_start; memcpy(vp, &sh_mobile_sleep_resume_start, n); sdp->resume = (unsigned long)vp; sh_mobile_sleep_supported |= flags; } static int sh_pm_enter(suspend_state_t state) { if (!(sh_mobile_sleep_supported & SUSP_MODE_STANDBY_SF)) return -ENXIO; local_irq_disable(); set_bl_bit(); sh_mobile_call_standby(SUSP_MODE_STANDBY_SF); local_irq_disable(); clear_bl_bit(); return 0; } static const struct platform_suspend_ops sh_pm_ops = { .enter = sh_pm_enter, .valid = suspend_valid_only_mem, }; static int __init sh_pm_init(void) { suspend_set_ops(&sh_pm_ops); return sh_mobile_setup_cpuidle(); } late_initcall(sh_pm_init);