x86, olpc-xo1-sci: Add GPE handler and ebook switch functionality

The EC in the OLPC XO-1 delivers GPE events to provide various
notifications. Add the basic code for GPE/EC event processing and
enable the ebook switch, which can be used as a wakeup source.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-8-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, 22 insertions, 0 deletions

diff --git a/include/linux/cs5535.h b/include/linux/cs5535.h
index 6f78235cb905..d7e9a7f6ddb0 100644
--- a/include/linux/cs5535.h
+++ b/include/linux/cs5535.h
@@ -11,6 +11,8 @@
 #ifndef _CS5535_H
 #define _CS5535_H
 
+#include <asm/msr.h>
+
 /* MSRs */
 #define MSR_GLIU_P2D_RO0        0x10000029
 
@@ -43,6 +45,18 @@
 #define MSR_GX_GLD_MSR_CONFIG   0xC0002001
 #define MSR_GX_MSR_PADSEL       0xC0002011
 
+static inline int cs5535_pic_unreqz_select_high(unsigned int group,
+                                                unsigned int irq)
+{
+        uint32_t lo, hi;
+
+        rdmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
+        lo &= ~(0xF << (group * 4));
+        lo |= (irq & 0xF) << (group * 4);
+        wrmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
+        return 0;
+}
+
 /* PIC registers */
 #define CS5536_PIC_INT_SEL1     0x4d0
 #define CS5536_PIC_INT_SEL2     0x4d1
@@ -73,6 +87,7 @@
 #define CS5536_PM1_EN           0x02
 #define CS5536_PM1_CNT          0x08
 #define CS5536_PM_GPE0_STS      0x18
+#define CS5536_PM_GPE0_EN       0x1c
 
 /* CS5536_PM1_STS bits */
 #define CS5536_WAK_FLAG         (1 << 15)
@@ -81,6 +96,13 @@
 /* CS5536_PM1_EN bits */
 #define CS5536_PM_PWRBTN        (1 << 8)
 
+/* CS5536_PM_GPE0_STS bits */
+#define CS5536_GPIOM7_PME_FLAG  (1 << 31)
+#define CS5536_GPIOM6_PME_FLAG  (1 << 30)
+
+/* CS5536_PM_GPE0_EN bits */
+#define CS5536_GPIOM7_PME_EN    (1 << 31)
+
 /* VSA2 magic values */
 #define VSA_VRC_INDEX           0xAC1C
 #define VSA_VRC_DATA            0xAC1E