92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
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* arch/sh/kernel/cpu/sh4a/pm-sh_mobile.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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/*
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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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/*
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* The following modes are not there yet:
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*
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* R-standby mode is unsupported, but will be added in the future
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* U-standby mode is low priority since it needs bootloader hacks
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*
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* All modes should be tied in with cpuidle. But before that can
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* happen we need to keep track of enabled hardware blocks so we
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* can avoid entering sleep modes that stop clocks to hardware
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* blocks that are in use even though the cpu core is idle.
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*/
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extern const unsigned char sh_mobile_standby[];
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extern const unsigned int sh_mobile_standby_size;
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static void sh_mobile_call_standby(unsigned long mode)
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{
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extern void *vbr_base;
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void *onchip_mem = (void *)0xe5200000; /* ILRAM */
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void (*standby_onchip_mem)(unsigned long) = onchip_mem;
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/* Note: Wake up from sleep may generate exceptions!
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* Setup VBR to point to on-chip ram if self-refresh is
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* going to be used.
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*/
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if (mode & SUSP_SH_SF)
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asm volatile("ldc %0, vbr" : : "r" (onchip_mem) : "memory");
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/* Copy the assembly snippet to the otherwise ununsed ILRAM */
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memcpy(onchip_mem, sh_mobile_standby, sh_mobile_standby_size);
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wmb();
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ctrl_barrier();
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/* Let assembly snippet in on-chip memory handle the rest */
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standby_onchip_mem(mode);
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/* Put VBR back in System RAM again */
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if (mode & SUSP_SH_SF)
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asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
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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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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 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 0;
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}
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late_initcall(sh_pm_init);
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