mainboard/google/reef: Add support for RECOVERY_MRC_CACHE

1. Add RECOVERY_MRC_CACHE region to reef FMAP.
2. Implement helper function for getting event for recovery mode with
memory retraining.
3. Select HAS_RECOVERY_MRC_CACHE.

BUG=chrome-os-partner:59352
BRANCH=None
TEST=Verified recovery mode behavior with and without memory training
request on reef.

Change-Id: I91abc9f8122f1aa3980c6372ab557e56a7a92730
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/17243
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/mainboard/google/reef/Kconfig

@@ -34,6 +34,7 @@ config DRIVER_TPM_I2C_IRQ
 
 config CHROMEOS
 	select LID_SWITCH if BASEBOARD_REEF_LAPTOP
+	select HAS_RECOVERY_MRC_CACHE
 
 config DRIVERS_I2C_DA7219
 	default y

src/mainboard/google/reef/chromeos.c

@@ -55,11 +55,22 @@ int get_recovery_mode_switch(void)
 		  EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY));
 }
 
+int get_recovery_mode_retrain_switch(void)
+{
+	/*
+	 * Check if the EC has posted the keyboard recovery event with memory
+	 * retrain.
+	 */
+	return !!(google_chromeec_get_events_b() &
+		EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY_HW_REINIT));
+}
+
 int clear_recovery_mode_switch(void)
 {
-	/* Clear keyboard recovery event. */
+	/* Clear all host event bits requesting recovery mode. */
 	return google_chromeec_clear_events_b(
-		EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY));
+		EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY) |
+		EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEYBOARD_RECOVERY_HW_REINIT));
 }
 
 int get_write_protect_state(void)

src/mainboard/google/reef/chromeos.fmd

@@ -13,7 +13,10 @@ FLASH 16M {
 		}
 	}
 	MISC_RW@0x400000 0x4a000 {
-		RW_MRC_CACHE@0x0 0x40000
+		UNIFIED_MRC_CACHE@0x0 0x40000 {
+			RECOVERY_MRC_CACHE@0x0 0x10000
+			RW_MRC_CACHE@0x10000 0x30000
+		}
 		RW_ELOG@0x40000 0x4000
 		RW_SHARED@0x44000 0x4000 {
 			SHARED_DATA@0x0 0x2000