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: Magnus Damm <damm@igel.co.jp> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm
Paul Mundt
parent
7a516280b6
commit
7759491274
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@ -181,6 +181,7 @@ config CPU_SHX3
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config ARCH_SHMOBILE
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bool
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select ARCH_SUSPEND_POSSIBLE
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choice
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prompt "Processor sub-type selection"
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@ -1,6 +1,7 @@
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#ifndef _ASM_SH_SUSPEND_H
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#define _ASM_SH_SUSPEND_H
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#ifndef __ASSEMBLY__
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static inline int arch_prepare_suspend(void) { return 0; }
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#include <asm/ptrace.h>
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@ -9,5 +10,13 @@ struct swsusp_arch_regs {
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struct pt_regs user_regs;
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unsigned long bank1_regs[8];
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};
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#endif
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/* flags passed to assembly suspend code */
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#define SUSP_SH_SLEEP (1 << 0) /* Regular sleep mode */
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#define SUSP_SH_STANDBY (1 << 1) /* SH-Mobile Software standby mode */
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#define SUSP_SH_RSTANDBY (1 << 2) /* SH-Mobile R-standby mode */
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#define SUSP_SH_USTANDBY (1 << 3) /* SH-Mobile U-standby mode */
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#define SUSP_SH_SF (1 << 4) /* Enable self-refresh */
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#endif /* _ASM_SH_SUSPEND_H */
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@ -35,6 +35,10 @@ pinmux-$(CONFIG_CPU_SUBTYPE_SH7723) := pinmux-sh7723.o
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pinmux-$(CONFIG_CPU_SUBTYPE_SH7785) := pinmux-sh7785.o
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pinmux-$(CONFIG_CPU_SUBTYPE_SH7786) := pinmux-sh7786.o
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# Power Mangement & Sleep mode
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pm-$(CONFIG_ARCH_SHMOBILE) := pm-sh_mobile.o sleep-sh_mobile.o
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obj-y += $(clock-y)
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obj-$(CONFIG_SMP) += $(smp-y)
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obj-$(CONFIG_GENERIC_GPIO) += $(pinmux-y)
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obj-$(CONFIG_PM) += $(pm-y)
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@ -0,0 +1,92 @@
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/*
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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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@ -0,0 +1,125 @@
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/*
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* arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S
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*
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* Sleep mode and Standby modes support 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/sys.h>
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#include <linux/errno.h>
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/suspend.h>
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/* manage self-refresh and enter standby mode.
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* this code will be copied to on-chip memory and executed from there.
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*/
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.balign 4096,0,4096
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ENTRY(sh_mobile_standby)
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mov r4, r0
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tst #SUSP_SH_SF, r0
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bt skip_set_sf
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/* SDRAM: disable power down and put in self-refresh mode */
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mov.l 1f, r4
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mov.l 2f, r1
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mov.l @r4, r2
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or r1, r2
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mov.l 3f, r3
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and r3, r2
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mov.l r2, @r4
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skip_set_sf:
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tst #SUSP_SH_SLEEP, r0
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bt test_standby
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/* set mode to "sleep mode" */
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bra do_sleep
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mov #0x00, r1
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test_standby:
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tst #SUSP_SH_STANDBY, r0
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bt test_rstandby
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/* set mode to "software standby mode" */
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bra do_sleep
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mov #0x80, r1
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test_rstandby:
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tst #SUSP_SH_RSTANDBY, r0
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bt test_ustandby
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/* set mode to "r-standby mode" */
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bra do_sleep
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mov #0x20, r1
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test_ustandby:
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tst #SUSP_SH_USTANDBY, r0
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bt done_sleep
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/* set mode to "u-standby mode" */
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mov #0x10, r1
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/* fall-through */
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do_sleep:
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/* setup and enter selected standby mode */
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mov.l 5f, r4
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mov.l r1, @r4
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sleep
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done_sleep:
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/* reset standby mode to sleep mode */
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mov.l 5f, r4
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mov #0x00, r1
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mov.l r1, @r4
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tst #SUSP_SH_SF, r0
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bt skip_restore_sf
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/* SDRAM: set auto-refresh mode */
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mov.l 1f, r4
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mov.l @r4, r2
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mov.l 4f, r3
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and r3, r2
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mov.l r2, @r4
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mov.l 6f, r4
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mov.l 7f, r1
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mov.l 8f, r2
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mov.l @r4, r3
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mov #-1, r4
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add r4, r3
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or r2, r3
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mov.l r3, @r1
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skip_restore_sf:
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rts
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nop
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.balign 4
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1: .long 0xfe400008 /* SDCR0 */
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2: .long 0x00000400
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3: .long 0xffff7fff
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4: .long 0xfffffbff
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5: .long 0xa4150020 /* STBCR */
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6: .long 0xfe40001c /* RTCOR */
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7: .long 0xfe400018 /* RTCNT */
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8: .long 0xa55a0000
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/* interrupt vector @ 0x600 */
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.balign 0x400,0,0x400
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.long 0xdeadbeef
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.balign 0x200,0,0x200
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/* sh7722 will end up here in sleep mode */
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rte
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nop
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sh_mobile_standby_end:
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ENTRY(sh_mobile_standby_size)
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.long sh_mobile_standby_end - sh_mobile_standby
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