ec/google/wilco: Enable WiFi radio

Add EC command to enable WiFi radio and send that command at
startup.  Tested to ensure WiFi is functional on a sarien board.

Change-Id: Iac46895c7118567e1eb55ea33051a1662103b563
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/29673
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/ec/google/wilco/chip.c

@@ -66,6 +66,9 @@ static void wilco_ec_init(struct device *dev)
 
 	/* Unmute speakers */
 	wilco_ec_send(KB_HW_MUTE_CONTROL, AUDIO_UNMUTE_125MS);
+
+	/* Enable WiFi radio */
+	wilco_ec_radio_control(RADIO_WIFI, 1);
 }
 
 static void wilco_ec_resource(struct device *dev, int index,

src/ec/google/wilco/commands.c

@@ -149,3 +149,12 @@ void wilco_ec_power_off(enum ec_power_off_reason reason)
 			     KB_POWER_OFF, &reason, 1, NULL, 0) < 0)
 		printk(BIOS_ERR, "%s: command failed\n", __func__);
 }
+
+int wilco_ec_radio_control(enum ec_radio radio, uint8_t state)
+{
+	uint8_t radio_control[3] = { 0, radio, state };
+
+	return wilco_ec_mailbox(WILCO_EC_MSG_DEFAULT, KB_RADIO_CONTROL,
+				radio_control, ARRAY_SIZE(radio_control),
+				NULL, 0);
+}

src/ec/google/wilco/commands.h

@@ -26,6 +26,8 @@ enum {
 	KB_POWER_STATUS = 0x05,
 	/* Inform the EC aboout the reason host is turning off */
 	KB_POWER_OFF = 0x08,
+	/* Control wireless radios */
+	KB_RADIO_CONTROL = 0x2b,
 	/* Save PS/2 data before S3 suspend */
 	KB_SAVE = 0x2f,
 	/* Restore PS/2 data after S3 resume */
@@ -61,6 +63,18 @@ enum ec_audio_mute {
 	AUDIO_UNMUTE_125MS,	/* Unmute in 125ms */
 };
 
+enum ec_radio {
+	RADIO_WIFI = 0x02,
+};
+
+/**
+ * wilco_ec_radio_control() - Control wireless radios.
+ * @ec_radio: Wireless radio type.
+ * @state: Turn radio on or off.
+ * Return: 0 if successful or negative error code on failure.
+ */
+int wilco_ec_radio_control(enum ec_radio radio, uint8_t state);
+
 /*
  * EC Information
  */