156 lines
4.3 KiB
C
156 lines
4.3 KiB
C
/*
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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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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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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 <asm/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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