Commit 77594912 authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
Browse files

sh: SuperH Mobile suspend support 



This patch contains CONFIG_SUSPEND support to the SuperH
architecture. If enabled, SuperH Mobile processors will
register their suspend callbacks during boot.

To suspend, use "echo mem > /sys/power/state". To allow
wakeup, make sure "/sys/device/platform/../power/wakeup"
contains "enabled". Additional per-device driver patches
are most likely needed.

Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 7a516280

arch/sh/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -181,6 +181,7 @@ config CPU_SHX3 


config ARCH_SHMOBILE

	bool

	select ARCH_SUSPEND_POSSIBLE



choice

	prompt "Processor sub-type selection"

arch/sh/include/asm/suspend.h

+9 −0
Original line number Diff line number Diff line 
#ifndef _ASM_SH_SUSPEND_H

#define _ASM_SH_SUSPEND_H



#ifndef __ASSEMBLY__

static inline int arch_prepare_suspend(void) { return 0; }



#include <asm/ptrace.h>
@@ -9,5 +10,13 @@ struct swsusp_arch_regs { 
	struct pt_regs user_regs;

	unsigned long bank1_regs[8];

};

#endif



/* flags passed to assembly suspend code */

#define SUSP_SH_SLEEP		(1 << 0) /* Regular sleep mode */

#define SUSP_SH_STANDBY		(1 << 1) /* SH-Mobile Software standby mode */

#define SUSP_SH_RSTANDBY	(1 << 2) /* SH-Mobile R-standby mode */

#define SUSP_SH_USTANDBY	(1 << 3) /* SH-Mobile U-standby mode */

#define SUSP_SH_SF		(1 << 4) /* Enable self-refresh */



#endif /* _ASM_SH_SUSPEND_H */

arch/sh/kernel/cpu/sh4a/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -35,6 +35,10 @@ pinmux-$(CONFIG_CPU_SUBTYPE_SH7723) := pinmux-sh7723.o 
pinmux-$(CONFIG_CPU_SUBTYPE_SH7785)	:= pinmux-sh7785.o

pinmux-$(CONFIG_CPU_SUBTYPE_SH7786)	:= pinmux-sh7786.o



# Power Mangement & Sleep mode

pm-$(CONFIG_ARCH_SHMOBILE)		:= pm-sh_mobile.o sleep-sh_mobile.o



obj-y			+= $(clock-y)

obj-$(CONFIG_SMP)	+= $(smp-y)

obj-$(CONFIG_GENERIC_GPIO)	+= $(pinmux-y)

obj-$(CONFIG_PM)	+= $(pm-y)

arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c

0 → 100644
+92 −0
Original line number Diff line number Diff line 
/*

 * arch/sh/kernel/cpu/sh4a/pm-sh_mobile.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>



/*

 * 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)



/*

 * The following modes are not there yet:

 *

 * R-standby mode is unsupported, but will be added in the future

 * U-standby mode is low priority since it needs bootloader hacks

 *

 * All modes should be tied in with cpuidle. But before that can

 * happen we need to keep track of enabled hardware blocks so we

 * can avoid entering sleep modes that stop clocks to hardware

 * blocks that are in use even though the cpu core is idle.

 */



extern const unsigned char sh_mobile_standby[];

extern const unsigned int sh_mobile_standby_size;



static void sh_mobile_call_standby(unsigned long mode)

{

	extern void *vbr_base;

	void *onchip_mem = (void *)0xe5200000; /* ILRAM */

	void (*standby_onchip_mem)(unsigned long) = onchip_mem;



	/* Note: Wake up from sleep may generate exceptions!

	 * Setup VBR to point to on-chip ram if self-refresh is

	 * going to be used.

	 */

	if (mode & SUSP_SH_SF)

		asm volatile("ldc %0, vbr" : : "r" (onchip_mem) : "memory");



	/* Copy the assembly snippet to the otherwise ununsed ILRAM */

	memcpy(onchip_mem, sh_mobile_standby, sh_mobile_standby_size);

	wmb();

	ctrl_barrier();



	/* Let assembly snippet in on-chip memory handle the rest */

	standby_onchip_mem(mode);



	/* Put VBR back in System RAM again */

	if (mode & SUSP_SH_SF)

		asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");

}



static int sh_pm_enter(suspend_state_t state)

{

	local_irq_disable();

	set_bl_bit();

	sh_mobile_call_standby(SUSP_MODE_STANDBY_SF);

	local_irq_disable();

	clear_bl_bit();

	return 0;

}



static 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 0;

}



late_initcall(sh_pm_init);

arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S

0 → 100644
+125 −0
Original line number Diff line number Diff line 
/*

 * arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S

 *

 * Sleep mode and Standby modes support 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/sys.h>

#include <linux/errno.h>

#include <linux/linkage.h>

#include <asm/asm-offsets.h>

#include <asm/suspend.h>



/* manage self-refresh and enter standby mode.

 * this code will be copied to on-chip memory and executed from there.

 */



	.balign 	4096,0,4096

ENTRY(sh_mobile_standby)

	mov	r4, r0



	tst	#SUSP_SH_SF, r0

	bt	skip_set_sf



	/* SDRAM: disable power down and put in self-refresh mode */

	mov.l	1f, r4

	mov.l	2f, r1

	mov.l	@r4, r2

	or	r1, r2

	mov.l   3f, r3

	and	r3, r2

	mov.l	r2, @r4



skip_set_sf:

	tst	#SUSP_SH_SLEEP, r0

	bt	test_standby



	/* set mode to "sleep mode" */

	bra	do_sleep

	 mov	#0x00, r1



test_standby:

	tst	#SUSP_SH_STANDBY, r0

	bt	test_rstandby



	/* set mode to "software standby mode" */

	bra	do_sleep

	 mov	#0x80, r1



test_rstandby:

	tst	#SUSP_SH_RSTANDBY, r0

	bt	test_ustandby



	/* set mode to "r-standby mode" */

	bra	do_sleep

	 mov	#0x20, r1



test_ustandby:

	tst	#SUSP_SH_USTANDBY, r0

	bt	done_sleep



	/* set mode to "u-standby mode" */

	mov	#0x10, r1



	/* fall-through */



do_sleep:

	/* setup and enter selected standby mode */

	mov.l	5f, r4

	mov.l	r1, @r4

	sleep



done_sleep:

	/* reset standby mode to sleep mode */

	mov.l	5f, r4

	mov	#0x00, r1

	mov.l	r1, @r4



	tst	#SUSP_SH_SF, r0

	bt	skip_restore_sf



	/* SDRAM: set auto-refresh mode */

	mov.l	1f, r4

	mov.l	@r4, r2

	mov.l   4f, r3

	and	r3, r2

	mov.l	r2, @r4

	mov.l	6f, r4

	mov.l	7f, r1

	mov.l	8f, r2

	mov.l	@r4, r3

	mov	#-1, r4

	add	r4, r3

	or	r2, r3

	mov.l	r3, @r1

skip_restore_sf:

	rts

	 nop



	.balign 4

1:	.long	0xfe400008 /* SDCR0 */

2:	.long	0x00000400

3:	.long	0xffff7fff

4:	.long	0xfffffbff

5:	.long	0xa4150020 /* STBCR */

6:	.long   0xfe40001c /* RTCOR */

7:	.long   0xfe400018 /* RTCNT */

8:	.long   0xa55a0000



/* interrupt vector @ 0x600 */

	.balign 	0x400,0,0x400

	.long	0xdeadbeef

	.balign 	0x200,0,0x200

	/* sh7722 will end up here in sleep mode */

	rte

	 nop

sh_mobile_standby_end:



ENTRY(sh_mobile_standby_size)

	.long sh_mobile_standby_end - sh_mobile_standby

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