chrome ec: Add support for limiting charger current

Update the ec_commands header (direct from EC source) and
add support for the new charger current limit interface
which will be used by DPTF.

Change-Id: Ia9a2a84b612a2982dbe996f07a856be6cd53ebdb
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/185758
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
(cherry picked from commit 1fcca2d75856ecefd3aeb1c551182aa76d649466)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6925
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/ec/google/chromeec/acpi/ec.asl

@@ -52,6 +52,7 @@ Device (EC0)
 		PATI, 8,	// Programmable Auxiliary Trip Sensor ID
 		PATT, 8,	// Programmable Auxiliary Trip Threshold
 		PATC, 8,	// Programmable Auxiliary Trip Commit
+		CHGL, 8,	// Charger Current Limit
 	}
 
 	OperationRegion (EMEM, SystemIO, EC_LPC_ADDR_MEMMAP, EC_MEMMAP_SIZE)
@@ -380,7 +381,7 @@ Device (EC0)
 
 	/*
 	 * Thermal Threshold Event
-	  */
+	 */
 	Method (_Q09, 0, NotSerialized)
 	{
 		If (Acquire (^PATM, 1000)) {
@@ -404,6 +405,23 @@ Device (EC0)
 		Release (^PATM)
 	}
 
+	/*
+	 * Set Charger Current Limit
+	 *   Arg0 = Current Limit in 64mA steps
+	 */
+	Method (CHGS, 1, Serialized)
+	{
+		Store (ToInteger (Arg0), ^CHGL)
+	}
+
+	/*
+	 * Disable Charger Current Limit
+	 */
+	Method (CHGD, 0, Serialized)
+	{
+		Store (0xFF, ^CHGL)
+	}
+
 	#include "ac.asl"
 	#include "battery.asl"
 }

src/ec/google/chromeec/ec_commands.h

@@ -249,6 +249,11 @@ enum host_event_code {
 	/* Suggest that the AP resume normal speed */
 	EC_HOST_EVENT_THROTTLE_STOP = 19,
 
+	/* Hang detect logic detected a hang and host event timeout expired */
+	EC_HOST_EVENT_HANG_DETECT = 20,
+	/* Hang detect logic detected a hang and warm rebooted the AP */
+	EC_HOST_EVENT_HANG_REBOOT = 21,
+
 	/*
 	 * The high bit of the event mask is not used as a host event code.  If
 	 * it reads back as set, then the entire event mask should be
@@ -1707,6 +1712,60 @@ struct ec_response_i2c_passthru {
 	uint8_t data[];		/* Data read by messages concatenated here */
 } __packed;
 
+/*****************************************************************************/
+/* Power button hang detect */
+
+#define EC_CMD_HANG_DETECT 0x9f
+
+/* Reasons to start hang detection timer */
+/* Power button pressed */
+#define EC_HANG_START_ON_POWER_PRESS  (1 << 0)
+
+/* Lid closed */
+#define EC_HANG_START_ON_LID_CLOSE    (1 << 1)
+
+ /* Lid opened */
+#define EC_HANG_START_ON_LID_OPEN     (1 << 2)
+
+/* Start of AP S3->S0 transition (booting or resuming from suspend) */
+#define EC_HANG_START_ON_RESUME       (1 << 3)
+
+/* Reasons to cancel hang detection */
+
+/* Power button released */
+#define EC_HANG_STOP_ON_POWER_RELEASE (1 << 8)
+
+/* Any host command from AP received */
+#define EC_HANG_STOP_ON_HOST_COMMAND  (1 << 9)
+
+/* Stop on end of AP S0->S3 transition (suspending or shutting down) */
+#define EC_HANG_STOP_ON_SUSPEND       (1 << 10)
+
+/*
+ * If this flag is set, all the other fields are ignored, and the hang detect
+ * timer is started.  This provides the AP a way to start the hang timer
+ * without reconfiguring any of the other hang detect settings.  Note that
+ * you must previously have configured the timeouts.
+ */
+#define EC_HANG_START_NOW             (1 << 30)
+
+/*
+ * If this flag is set, all the other fields are ignored (including
+ * EC_HANG_START_NOW).  This provides the AP a way to stop the hang timer
+ * without reconfiguring any of the other hang detect settings.
+ */
+#define EC_HANG_STOP_NOW              (1 << 31)
+
+struct ec_params_hang_detect {
+	/* Flags; see EC_HANG_* */
+	uint32_t flags;
+
+	/* Timeout in msec before generating host event, if enabled */
+	uint16_t host_event_timeout_msec;
+
+	/* Timeout in msec before generating warm reboot, if enabled */
+	uint16_t warm_reboot_timeout_msec;
+} __packed;
 
 /*****************************************************************************/
 /* Debug commands for battery charging */
@@ -1912,6 +1971,14 @@ struct ec_params_reboot_ec {
  *   write 0x1 to [0x07]    --  disable threshold 1
  */
 
+/* DPTF battery charging current limit */
+#define EC_ACPI_MEM_CHARGING_LIMIT     0x08
+
+/* Charging limit is specified in 64 mA steps */
+#define EC_ACPI_MEM_CHARGING_LIMIT_STEP_MA   64
+/* Value to disable DPTF battery charging limit */
+#define EC_ACPI_MEM_CHARGING_LIMIT_DISABLED  0xff
+
 /* Current version of ACPI memory address space */
 #define EC_ACPI_MEM_VERSION_CURRENT 1