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- /*
- * 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);
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