sh: hibernation support

Add Suspend-to-disk / swsusp / CONFIG_HIBERNATION support
to the SuperH architecture.

To suspend, use "swapon /dev/sda2; echo disk > /sys/power/state"
To resume, pass "resume=/dev/sda2" on the kernel command line.

The patch "pm: rework includes, remove arch ifdefs V2" is
needed to allow the generic swsusp code to build properly.

Hibernation is not enabled with this patch though, a patch
setting ARCH_HIBERNATION_POSSIBLE will be submitted later.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/sh/kernel/swsusp.c b/arch/sh/kernel/swsusp.c
new file mode 100644
index 000000000000..12b64a0f2f01
--- /dev/null
+++ b/arch/sh/kernel/swsusp.c
@@ -0,0 +1,38 @@
+/*
+ * swsusp.c - SuperH hibernation support
+ *
+ * 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/mm.h>
+#include <linux/sched.h>
+#include <linux/suspend.h>
+#include <asm/suspend.h>
+#include <asm/sections.h>
+#include <asm/tlbflush.h>
+#include <asm/page.h>
+#include <asm/fpu.h>
+
+struct swsusp_arch_regs swsusp_arch_regs_cpu0;
+
+int pfn_is_nosave(unsigned long pfn)
+{
+        unsigned long begin_pfn = __pa(&__nosave_begin) >> PAGE_SHIFT;
+        unsigned long end_pfn = PAGE_ALIGN(__pa(&__nosave_end)) >> PAGE_SHIFT;
+
+        return (pfn >= begin_pfn) && (pfn < end_pfn);
+}
+
+void save_processor_state(void)
+{
+        init_fpu(current);
+}
+
+void restore_processor_state(void)
+{
+        local_flush_tlb_all();
+}