x86, olpc: EC SCI wakeup mask functionality

Update the EC SCI masks with recent additions.

Add functions to query SCI events and set the wakeup mask, to be used by
followup patches.

Add functions to tweak an event mask used to select certain EC events as
a system wakeup source. Also add a function to determine if EC wakeup
functionality is available, as this depends on child drivers (different
for each laptop model) to configure the SCI interrupt.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Link: http://lkml.kernel.org/r/1309019658-1712-7-git-send-email-dsd@laptop.org
Acked-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

2 files changed, 111 insertions, 6 deletions

diff --git a/arch/x86/include/asm/olpc.h b/arch/x86/include/asm/olpc.h
index 10ea59594b71..0e56d01907fe 100644
--- a/arch/x86/include/asm/olpc.h
+++ b/arch/x86/include/asm/olpc.h
@@ -13,6 +13,7 @@ struct olpc_platform_t {
 
 #define OLPC_F_PRESENT          0x01
 #define OLPC_F_DCON             0x02
+#define OLPC_F_EC_WIDE_SCI      0x04
 
 #ifdef CONFIG_OLPC
 
@@ -62,6 +63,13 @@ static inline int olpc_board_at_least(uint32_t rev)
         return olpc_platform_info.boardrev >= rev;
 }
 
+extern void olpc_ec_wakeup_set(u16 value);
+extern void olpc_ec_wakeup_clear(u16 value);
+extern bool olpc_ec_wakeup_available(void);
+
+extern int olpc_ec_mask_write(u16 bits);
+extern int olpc_ec_sci_query(u16 *sci_value);
+
 #else
 
 static inline int machine_is_olpc(void)
@@ -74,6 +82,14 @@ static inline int olpc_has_dcon(void)
         return 0;
 }
 
+static inline void olpc_ec_wakeup_set(u16 value) { }
+static inline void olpc_ec_wakeup_clear(u16 value) { }
+
+static inline bool olpc_ec_wakeup_available(void)
+{
+        return false;
+}
+
 #endif
 
 #ifdef CONFIG_OLPC_XO1_PM
@@ -89,17 +105,18 @@ extern int pci_olpc_init(void);
 extern int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen,
                 unsigned char *outbuf, size_t outlen);
 
-extern int olpc_ec_mask_set(uint8_t bits);
-extern int olpc_ec_mask_unset(uint8_t bits);
-
 /* EC commands */
 
 #define EC_FIRMWARE_REV                 0x08
+#define EC_WRITE_SCI_MASK               0x1b
 #define EC_WAKE_UP_WLAN                 0x24
 #define EC_WLAN_LEAVE_RESET             0x25
 #define EC_SET_SCI_INHIBIT              0x32
 #define EC_SET_SCI_INHIBIT_RELEASE      0x34
 #define EC_WLAN_ENTER_RESET             0x35
+#define EC_WRITE_EXT_SCI_MASK           0x38
+#define EC_SCI_QUERY                    0x84
+#define EC_EXT_SCI_QUERY                0x85
 
 /* SCI source values */
 
@@ -108,10 +125,12 @@ extern int olpc_ec_mask_unset(uint8_t bits);
 #define EC_SCI_SRC_BATTERY      0x02
 #define EC_SCI_SRC_BATSOC       0x04
 #define EC_SCI_SRC_BATERR       0x08
-#define EC_SCI_SRC_EBOOK        0x10
-#define EC_SCI_SRC_WLAN         0x20
+#define EC_SCI_SRC_EBOOK        0x10    /* XO-1 only */
+#define EC_SCI_SRC_WLAN         0x20    /* XO-1 only */
 #define EC_SCI_SRC_ACPWR        0x40
-#define EC_SCI_SRC_ALL          0x7F
+#define EC_SCI_SRC_BATCRIT      0x80
+#define EC_SCI_SRC_GPWAKE       0x100   /* XO-1.5 only */
+#define EC_SCI_SRC_ALL          0x1FF
 
 /* GPIO assignments */
 
diff --git a/arch/x86/platform/olpc/olpc.c b/arch/x86/platform/olpc/olpc.c
index 0060fd59ea00..72fd041762fc 100644
--- a/arch/x86/platform/olpc/olpc.c
+++ b/arch/x86/platform/olpc/olpc.c
@@ -19,6 +19,7 @@
 #include <linux/string.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
+#include <linux/syscore_ops.h>
 
 #include <asm/geode.h>
 #include <asm/setup.h>
@@ -30,6 +31,9 @@ EXPORT_SYMBOL_GPL(olpc_platform_info);
 
 static DEFINE_SPINLOCK(ec_lock);
 
+/* EC event mask to be applied during suspend (defining wakeup sources). */
+static u16 ec_wakeup_mask;
+
 /* what the timeout *should* be (in ms) */
 #define EC_BASE_TIMEOUT 20
 
@@ -188,6 +192,79 @@ err:
 }
 EXPORT_SYMBOL_GPL(olpc_ec_cmd);
 
+void olpc_ec_wakeup_set(u16 value)
+{
+        ec_wakeup_mask |= value;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_set);
+
+void olpc_ec_wakeup_clear(u16 value)
+{
+        ec_wakeup_mask &= ~value;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_clear);
+
+/*
+ * Returns true if the compile and runtime configurations allow for EC events
+ * to wake the system.
+ */
+bool olpc_ec_wakeup_available(void)
+{
+        if (!machine_is_olpc())
+                return false;
+
+        /*
+         * XO-1 EC wakeups are available when olpc-xo1-sci driver is
+         * compiled in
+         */
+#ifdef CONFIG_OLPC_XO1_SCI
+        if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) /* XO-1 */
+                return true;
+#endif
+
+        return false;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_available);
+
+int olpc_ec_mask_write(u16 bits)
+{
+        if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
+                __be16 ec_word = cpu_to_be16(bits);
+                return olpc_ec_cmd(EC_WRITE_EXT_SCI_MASK, (void *) &ec_word, 2,
+                                   NULL, 0);
+        } else {
+                unsigned char ec_byte = bits & 0xff;
+                return olpc_ec_cmd(EC_WRITE_SCI_MASK, &ec_byte, 1, NULL, 0);
+        }
+}
+EXPORT_SYMBOL_GPL(olpc_ec_mask_write);
+
+int olpc_ec_sci_query(u16 *sci_value)
+{
+        int ret;
+
+        if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
+                __be16 ec_word;
+                ret = olpc_ec_cmd(EC_EXT_SCI_QUERY,
+                        NULL, 0, (void *) &ec_word, 2);
+                if (ret == 0)
+                        *sci_value = be16_to_cpu(ec_word);
+        } else {
+                unsigned char ec_byte;
+                ret = olpc_ec_cmd(EC_SCI_QUERY, NULL, 0, &ec_byte, 1);
+                if (ret == 0)
+                        *sci_value = ec_byte;
+        }
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_sci_query);
+
+static int olpc_ec_suspend(void)
+{
+        return olpc_ec_mask_write(ec_wakeup_mask);
+}
+
 static bool __init check_ofw_architecture(struct device_node *root)
 {
         const char *olpc_arch;
@@ -242,6 +319,10 @@ static int __init add_xo1_platform_devices(void)
         return 0;
 }
 
+static struct syscore_ops olpc_syscore_ops = {
+        .suspend = olpc_ec_suspend,
+};
+
 static int __init olpc_init(void)
 {
         int r = 0;
@@ -266,6 +347,9 @@ static int __init olpc_init(void)
                         !cs5535_has_vsa2())
                 x86_init.pci.arch_init = pci_olpc_init;
 #endif
+        /* EC version 0x5f adds support for wide SCI mask */
+        if (olpc_platform_info.ecver >= 0x5f)
+                olpc_platform_info.flags |= OLPC_F_EC_WIDE_SCI;
 
         printk(KERN_INFO "OLPC board revision %s%X (EC=%x)\n",
                         ((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "",
@@ -278,6 +362,8 @@ static int __init olpc_init(void)
                         return r;
         }
 
+        register_syscore_ops(&olpc_syscore_ops);
+
         return 0;
 }