x86, olpc: Add XO-1 suspend/resume support

Add code needed for basic suspend/resume of the XO-1 laptop.
Based on earlier work by Jordan Crouse, Andres Salomon, and others.

This patch incorporates all earlier feedback from Thomas Gleixner. To
clarify a certain point (now more obvious in the code itself):
On resume, OpenFirmware returns execution to Linux in protected mode
with a kernel-compatible GDT already set up. The changes and
simplifications suggested have all been included.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-5-git-send-email-dsd@laptop.org
Acked-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/cs5535.h b/include/linux/cs5535.h
index e46b8b0f9057..2facf16f017b 100644
--- a/include/linux/cs5535.h
+++ b/include/linux/cs5535.h
@@ -70,6 +70,9 @@
 #define CS5536_PM1_CNT          0x08
 #define CS5536_PM_GPE0_STS      0x18
 
+/* CS5536_PM1_EN bits */
+#define CS5536_PM_PWRBTN        (1 << 8)
+
 /* VSA2 magic values */
 #define VSA_VRC_INDEX           0xAC1C
 #define VSA_VRC_DATA            0xAC1E