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authorMagnus Damm <damm@igel.co.jp>2009-03-13 15:23:04 +0000
committerPaul Mundt <lethal@linux-sh.org>2009-03-16 19:52:53 +0900
commit7759491274bc5ba7cd72b3b9cc5ec8247b937efb (patch)
treef6e98001aa8296220e429c30ac3a8cc42b8cc95d /arch/sh
parent7a516280b6a99634933b417834e178bde8659da1 (diff)
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>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/Kconfig1
-rw-r--r--arch/sh/include/asm/suspend.h9
-rw-r--r--arch/sh/kernel/cpu/sh4a/Makefile4
-rw-r--r--arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c92
-rw-r--r--arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S125
5 files changed, 231 insertions, 0 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index adffbf4048b..a0c879d17fd 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -181,6 +181,7 @@ config CPU_SHX3
config ARCH_SHMOBILE
bool
+ select ARCH_SUSPEND_POSSIBLE
choice
prompt "Processor sub-type selection"
diff --git a/arch/sh/include/asm/suspend.h b/arch/sh/include/asm/suspend.h
index 5d6d8aba568..b1b995370e7 100644
--- a/arch/sh/include/asm/suspend.h
+++ b/arch/sh/include/asm/suspend.h
@@ -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 <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 */
diff --git a/arch/sh/kernel/cpu/sh4a/Makefile b/arch/sh/kernel/cpu/sh4a/Makefile
index 1a92361feeb..09967dc0065 100644
--- a/arch/sh/kernel/cpu/sh4a/Makefile
+++ b/arch/sh/kernel/cpu/sh4a/Makefile
@@ -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)
diff --git a/arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c b/arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c
new file mode 100644
index 00000000000..8c067adf683
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c
@@ -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);
diff --git a/arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S b/arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S
new file mode 100644
index 00000000000..5d888ef53d8
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh4a/sleep-sh_mobile.S
@@ -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