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153 lines
4.2 KiB
153 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* arch/sh/kernel/cpu/shmobile/pm.c |
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* |
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* Power management support code for SuperH Mobile |
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* |
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* Copyright (C) 2009 Magnus Damm |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/io.h> |
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#include <linux/suspend.h> |
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#include <asm/suspend.h> |
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#include <linux/uaccess.h> |
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#include <asm/cacheflush.h> |
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#include <asm/bl_bit.h> |
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/* |
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* Notifier lists for pre/post sleep notification |
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*/ |
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ATOMIC_NOTIFIER_HEAD(sh_mobile_pre_sleep_notifier_list); |
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ATOMIC_NOTIFIER_HEAD(sh_mobile_post_sleep_notifier_list); |
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/* |
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* Sleep modes available on SuperH Mobile: |
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* |
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* Sleep mode is just plain "sleep" instruction |
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* Sleep Self-Refresh mode is above plus RAM put in Self-Refresh |
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* Standby Self-Refresh mode is above plus stopped clocks |
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*/ |
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#define SUSP_MODE_SLEEP (SUSP_SH_SLEEP) |
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#define SUSP_MODE_SLEEP_SF (SUSP_SH_SLEEP | SUSP_SH_SF) |
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#define SUSP_MODE_STANDBY_SF (SUSP_SH_STANDBY | SUSP_SH_SF) |
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#define SUSP_MODE_RSTANDBY_SF \ |
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(SUSP_SH_RSTANDBY | SUSP_SH_MMU | SUSP_SH_REGS | SUSP_SH_SF) |
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/* |
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* U-standby mode is unsupported since it needs bootloader hacks |
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*/ |
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#ifdef CONFIG_CPU_SUBTYPE_SH7724 |
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#define RAM_BASE 0xfd800000 /* RSMEM */ |
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#else |
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#define RAM_BASE 0xe5200000 /* ILRAM */ |
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#endif |
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void sh_mobile_call_standby(unsigned long mode) |
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{ |
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void *onchip_mem = (void *)RAM_BASE; |
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struct sh_sleep_data *sdp = onchip_mem; |
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void (*standby_onchip_mem)(unsigned long, unsigned long); |
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/* code located directly after data structure */ |
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standby_onchip_mem = (void *)(sdp + 1); |
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atomic_notifier_call_chain(&sh_mobile_pre_sleep_notifier_list, |
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mode, NULL); |
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/* flush the caches if MMU flag is set */ |
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if (mode & SUSP_SH_MMU) |
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flush_cache_all(); |
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/* Let assembly snippet in on-chip memory handle the rest */ |
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standby_onchip_mem(mode, RAM_BASE); |
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atomic_notifier_call_chain(&sh_mobile_post_sleep_notifier_list, |
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mode, NULL); |
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} |
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extern char sh_mobile_sleep_enter_start; |
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extern char sh_mobile_sleep_enter_end; |
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extern char sh_mobile_sleep_resume_start; |
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extern char sh_mobile_sleep_resume_end; |
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unsigned long sh_mobile_sleep_supported = SUSP_SH_SLEEP; |
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void sh_mobile_register_self_refresh(unsigned long flags, |
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void *pre_start, void *pre_end, |
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void *post_start, void *post_end) |
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{ |
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void *onchip_mem = (void *)RAM_BASE; |
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void *vp; |
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struct sh_sleep_data *sdp; |
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int n; |
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/* part 0: data area */ |
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sdp = onchip_mem; |
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sdp->addr.stbcr = 0xa4150020; /* STBCR */ |
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sdp->addr.bar = 0xa4150040; /* BAR */ |
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sdp->addr.pteh = 0xff000000; /* PTEH */ |
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sdp->addr.ptel = 0xff000004; /* PTEL */ |
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sdp->addr.ttb = 0xff000008; /* TTB */ |
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sdp->addr.tea = 0xff00000c; /* TEA */ |
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sdp->addr.mmucr = 0xff000010; /* MMUCR */ |
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sdp->addr.ptea = 0xff000034; /* PTEA */ |
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sdp->addr.pascr = 0xff000070; /* PASCR */ |
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sdp->addr.irmcr = 0xff000078; /* IRMCR */ |
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sdp->addr.ccr = 0xff00001c; /* CCR */ |
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sdp->addr.ramcr = 0xff000074; /* RAMCR */ |
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vp = sdp + 1; |
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/* part 1: common code to enter sleep mode */ |
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n = &sh_mobile_sleep_enter_end - &sh_mobile_sleep_enter_start; |
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memcpy(vp, &sh_mobile_sleep_enter_start, n); |
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vp += roundup(n, 4); |
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/* part 2: board specific code to enter self-refresh mode */ |
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n = pre_end - pre_start; |
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memcpy(vp, pre_start, n); |
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sdp->sf_pre = (unsigned long)vp; |
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vp += roundup(n, 4); |
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/* part 3: board specific code to resume from self-refresh mode */ |
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n = post_end - post_start; |
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memcpy(vp, post_start, n); |
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sdp->sf_post = (unsigned long)vp; |
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vp += roundup(n, 4); |
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/* part 4: common code to resume from sleep mode */ |
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WARN_ON(vp > (onchip_mem + 0x600)); |
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vp = onchip_mem + 0x600; /* located at interrupt vector */ |
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n = &sh_mobile_sleep_resume_end - &sh_mobile_sleep_resume_start; |
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memcpy(vp, &sh_mobile_sleep_resume_start, n); |
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sdp->resume = (unsigned long)vp; |
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sh_mobile_sleep_supported |= flags; |
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} |
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static int sh_pm_enter(suspend_state_t state) |
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{ |
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if (!(sh_mobile_sleep_supported & SUSP_MODE_STANDBY_SF)) |
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return -ENXIO; |
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local_irq_disable(); |
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set_bl_bit(); |
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sh_mobile_call_standby(SUSP_MODE_STANDBY_SF); |
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local_irq_disable(); |
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clear_bl_bit(); |
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return 0; |
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} |
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static const struct platform_suspend_ops sh_pm_ops = { |
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.enter = sh_pm_enter, |
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.valid = suspend_valid_only_mem, |
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}; |
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static int __init sh_pm_init(void) |
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{ |
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suspend_set_ops(&sh_pm_ops); |
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return sh_mobile_setup_cpuidle(); |
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} |
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late_initcall(sh_pm_init);
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