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sh: SuperH Mobile suspend support

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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: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm
2009-03-13 15:23:04 +00:00
committed by Paul Mundt
parent 7a516280b6
commit 7759491274
5 changed files with 231 additions and 0 deletions
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1
arch/sh/Kconfig
View File

@@ -181,6 +181,7 @@ config CPU_SHX3
config ARCH_SHMOBILE config ARCH_SHMOBILE
bool bool
select ARCH_SUSPEND_POSSIBLE
choice choice
prompt "Processor sub-type selection" prompt "Processor sub-type selection"

9
arch/sh/include/asm/suspend.h
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@@ -1,6 +1,7 @@
#ifndef _ASM_SH_SUSPEND_H #ifndef _ASM_SH_SUSPEND_H
#define _ASM_SH_SUSPEND_H #define _ASM_SH_SUSPEND_H
#ifndef __ASSEMBLY__
static inline int arch_prepare_suspend(void) { return 0; } static inline int arch_prepare_suspend(void) { return 0; }
#include <asm/ptrace.h> #include <asm/ptrace.h>
@@ -9,5 +10,13 @@ struct swsusp_arch_regs {
struct pt_regs user_regs; struct pt_regs user_regs;
unsigned long bank1_regs[8]; 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 */ #endif /* _ASM_SH_SUSPEND_H */

4
arch/sh/kernel/cpu/sh4a/Makefile
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@@ -35,6 +35,10 @@ pinmux-$(CONFIG_CPU_SUBTYPE_SH7723) := pinmux-sh7723.o
pinmux-$(CONFIG_CPU_SUBTYPE_SH7785) := pinmux-sh7785.o pinmux-$(CONFIG_CPU_SUBTYPE_SH7785) := pinmux-sh7785.o
pinmux-$(CONFIG_CPU_SUBTYPE_SH7786) := pinmux-sh7786.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-y += $(clock-y)
obj-$(CONFIG_SMP) += $(smp-y) obj-$(CONFIG_SMP) += $(smp-y)
obj-$(CONFIG_GENERIC_GPIO) += $(pinmux-y) obj-$(CONFIG_GENERIC_GPIO) += $(pinmux-y)
obj-$(CONFIG_PM) += $(pm-y)

92
arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c Normal file
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@@ -0,0 +1,92 @@
/*
* 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);

125
arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S Normal file
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@@ -0,0 +1,125 @@
/*
* 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