From mboxrd@z Thu Jan 1 00:00:00 1970 From: Magnus Damm Date: Thu, 12 Mar 2009 14:45:33 +0000 Subject: [PATCH] sh: SuperH Mobile suspend support V2 Message-Id: <20090312144533.28453.15458.sendpatchset@rx1.opensource.se> List-Id: References: <20090309105143.23622.42915.sendpatchset@rx1.opensource.se> In-Reply-To: <20090309105143.23622.42915.sendpatchset@rx1.opensource.se> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-sh@vger.kernel.org From: Magnus Damm This patch contains CONFIG_SUSPEND support to the SuperH architecture V2. 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 --- Changes since V1: - fixed up issues pointed out by Paul - added more comments arch/sh/Kconfig | 1 arch/sh/include/asm/suspend.h | 9 ++ arch/sh/kernel/cpu/sh4a/Makefile | 7 + arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c | 92 +++++++++++++++++++++ arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S | 125 +++++++++++++++++++++++++++++ 5 files changed, 234 insertions(+) --- 0005/arch/sh/Kconfig +++ work/arch/sh/Kconfig 2009-03-12 23:13:25.000000000 +0900 @@ -181,6 +181,7 @@ config CPU_SHX3 config ARCH_SHMOBILE bool + select ARCH_SUSPEND_POSSIBLE choice prompt "Processor sub-type selection" --- 0001/arch/sh/include/asm/suspend.h +++ work/arch/sh/include/asm/suspend.h 2009-03-12 23:16:59.000000000 +0900 @@ -1,6 +1,7 @@ #ifndef _ASM_SH_SUSPEND_H #define _ASM_SH_SUSPEND_H +#ifndef __ASSEMBLY__ static inline int arch_prepare_suspend(void) { return 0; } #include @@ -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 */ --- 0001/arch/sh/kernel/cpu/sh4a/Makefile +++ work/arch/sh/kernel/cpu/sh4a/Makefile 2009-03-12 22:15:16.000000000 +0900 @@ -35,6 +35,13 @@ pinmux-$(CONFIG_CPU_SUBTYPE_SH7723) := p pinmux-$(CONFIG_CPU_SUBTYPE_SH7785) := pinmux-sh7785.o pinmux-$(CONFIG_CPU_SUBTYPE_SH7786) := pinmux-sh7786.o +# Power Mangement & Sleep mode +pm-$(CONFIG_CPU_SUBTYPE_SH7343) := pm-sh_mobile.o sleep-sh_mobile.o +pm-$(CONFIG_CPU_SUBTYPE_SH7366) := pm-sh_mobile.o sleep-sh_mobile.o +pm-$(CONFIG_CPU_SUBTYPE_SH7722) := pm-sh_mobile.o sleep-sh_mobile.o +pm-$(CONFIG_CPU_SUBTYPE_SH7723) := 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) --- /dev/null +++ work/arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c 2009-03-12 23:37:17.000000000 +0900 @@ -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 +#include +#include +#include +#include +#include + +/* + * 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 *)0xe520000; /* 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); --- /dev/null +++ work/arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S 2009-03-12 23:31:02.000000000 +0900 @@ -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 +#include +#include +#include +#include + +/* 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