sh: Consolidate SH-Mobile CPU code in arch/sh/kernel/cpu/shmobile/.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

3 files changed, 223 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/shmobile/Makefile b/arch/sh/kernel/cpu/shmobile/Makefile
new file mode 100644
index 00000000000..08bfa7c7db2
--- /dev/null
+++ b/arch/sh/kernel/cpu/shmobile/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the Linux/SuperH SH-Mobile backends.
+#
+
+# Power Management & Sleep mode
+obj-$(CONFIG_PM)	+= pm.o sleep.o
diff --git a/arch/sh/kernel/cpu/shmobile/pm.c b/arch/sh/kernel/cpu/shmobile/pm.c
new file mode 100644
index 00000000000..8c067adf683
--- /dev/null
+++ b/arch/sh/kernel/cpu/shmobile/pm.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/shmobile/sleep.S b/arch/sh/kernel/cpu/shmobile/sleep.S
new file mode 100644
index 00000000000..5d888ef53d8
--- /dev/null
+++ b/arch/sh/kernel/cpu/shmobile/sleep.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