[PATCH 4/4] Add 6xx-style HID0_SLEEP support.

[Scott Wood]

Signed-off-by: Scott Wood <scottwood at freescale.com>
---
 arch/powerpc/sysdev/6xx-pm.S |   52 ++++++++++++++++++++++++++++++++++++++++++
 arch/powerpc/sysdev/Makefile |    4 +++
 include/asm-powerpc/mpc6xx.h |    6 +++++
 3 files changed, 62 insertions(+), 0 deletions(-)
 create mode 100644 arch/powerpc/sysdev/6xx-pm.S
 create mode 100644 include/asm-powerpc/mpc6xx.h

diff --git a/arch/powerpc/sysdev/6xx-pm.S b/arch/powerpc/sysdev/6xx-pm.S
new file mode 100644
index 0000000..976ee07
--- /dev/null
+++ b/arch/powerpc/sysdev/6xx-pm.S
@@ -0,0 +1,52 @@
+/*
+ * Enter and leave sleep state on chips with 6xx-style HID0
+ * power management bits.
+ *
+ * Author: Scott Wood <scottwood at freescale.com>
+ *
+ * Copyright (c) 2006-2007 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <asm/ppc_asm.h>
+#include <asm/reg.h>
+#include <asm/thread_info.h>
+#include <asm/asm-offsets.h>
+
+_GLOBAL(mpc6xx_enter_sleep)
+	mflr	r4
+
+	mfspr	r5, SPRN_HID0
+	rlwinm	r5, r5, 0, ~(HID0_DOZE | HID0_NAP)
+	oris	r5, r5, HID0_SLEEP at h
+	mtspr	SPRN_HID0, r5
+	isync
+
+	lis	r5, ret_from_sleep at h
+	ori	r5, r5, ret_from_sleep at l
+	mtlr	r5
+
+	rlwinm	r5, r1, 0, 0, 31-THREAD_SHIFT
+	lwz	r6, TI_LOCAL_FLAGS(r5)
+	ori	r6, r6, _TLF_NAPPING
+	stw	r6, TI_LOCAL_FLAGS(r5)
+
+	mfmsr	r5
+	ori	r5, r5, MSR_EE
+	oris	r5, r5, MSR_POW at h
+	sync
+	mtmsr	r5
+	isync
+
+1:	b	1b
+
+ret_from_sleep:
+	mfspr	r5, SPRN_HID0
+	rlwinm	r5, r5, 0, ~HID0_SLEEP
+	mtspr	SPRN_HID0, r5
+
+	mtlr	r4
+	blr
diff --git a/arch/powerpc/sysdev/Makefile b/arch/powerpc/sysdev/Makefile
index 7d8ac1b..fdc2a28 100644
--- a/arch/powerpc/sysdev/Makefile
+++ b/arch/powerpc/sysdev/Makefile
@@ -35,3 +35,7 @@ obj-$(CONFIG_CPM2)		+= cpm2_common.o cpm2_pic.o
 obj-$(CONFIG_8xx)		+= mpc8xx_pic.o commproc.o
 obj-$(CONFIG_UCODE_PATCH)	+= micropatch.o
 endif
+
+ifeq ($(CONFIG_PM),y)
+obj-$(CONFIG_6xx)		+= 6xx-pm.o
+endif
diff --git a/include/asm-powerpc/mpc6xx.h b/include/asm-powerpc/mpc6xx.h
new file mode 100644
index 0000000..01a33ed
--- /dev/null
+++ b/include/asm-powerpc/mpc6xx.h
@@ -0,0 +1,6 @@
+#ifndef __ASM_POWERPC_MPC6xx_H
+#define __ASM_POWERPC_MPC6xx_H
+
+void mpc6xx_enter_sleep(void);
+
+#endif
-- 
1.5.0.3