ec/google/wilco: Add mailbox commands

Add basic supported mailbox commands for this embedded contrlller,
and define some command functions to retrieve and print information
about the EC.

Change-Id: Ibcef7d58e1852fdb2e52b97acd4b51a26dd8cd77
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/29115
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/ec/google/wilco/Makefile.inc

@@ -1,5 +1,5 @@
 ifeq ($(CONFIG_EC_GOOGLE_WILCO),y)
 
-ramstage-y += mailbox.c
+ramstage-y += commands.c mailbox.c
 
 endif

src/ec/google/wilco/commands.c

@@ -0,0 +1,52 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "ec.h"
+#include "commands.h"
+
+int wilco_ec_get_info(enum get_ec_info_cmd type, char *info)
+{
+	struct ec_response_get_ec_info rsp;
+
+	if (!info)
+		return -1;
+	if (wilco_ec_sendrecv(KB_EC_INFO, type, &rsp, sizeof(rsp)) < 0)
+		return -1;
+
+	/* Copy returned string */
+	strncpy(info, rsp.data, sizeof(rsp.data));
+	return 0;
+}
+
+void wilco_ec_print_all_info(void)
+{
+	char info[EC_INFO_MAX_SIZE];
+
+	if (!wilco_ec_get_info(GET_EC_LABEL, info))
+		printk(BIOS_INFO, "EC Label      : %s\n", info);
+
+	if (!wilco_ec_get_info(GET_EC_SVN_REV, info))
+		printk(BIOS_INFO, "EC Revision   : %s\n", info);
+
+	if (!wilco_ec_get_info(GET_EC_MODEL_NO, info))
+		printk(BIOS_INFO, "EC Model Num  : %s\n", info);
+
+	if (!wilco_ec_get_info(GET_EC_BUILD_DATE, info))
+		printk(BIOS_INFO, "EC Build Date : %s\n", info);
+}

src/ec/google/wilco/commands.h

@@ -0,0 +1,77 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef EC_GOOGLE_WILCO_COMMANDS_H
+#define EC_GOOGLE_WILCO_COMMANDS_H
+
+#include <stdint.h>
+
+enum {
+	/* Retrieve information about the EC */
+	KB_EC_INFO = 0x38,
+	/* Set ACPI mode on or off */
+	KB_ACPI = 0x3a,
+	/* Manage the EC power button passthru to the host */
+	KB_POWER_BUTTON_TO_HOST = 0x3e,
+};
+
+enum set_acpi_mode_cmd {
+	ACPI_OFF = 0,
+	ACPI_ON
+};
+
+/*
+ * EC Information
+ */
+
+enum get_ec_info_cmd {
+	GET_EC_LABEL = 0,
+	GET_EC_SVN_REV,
+	GET_EC_MODEL_NO,
+	GET_EC_BUILD_DATE
+};
+
+#define EC_INFO_MAX_SIZE 9
+struct ec_response_get_ec_info {
+	char data[EC_INFO_MAX_SIZE]; /* ASCII NUL terminated string */
+};
+
+/**
+ * wilco_ec_get_info
+ *
+ * Read a specific information string from the EC and return it in
+ * the caller-provided buffer of at least EC_INFO_MAX_SIZE bytes.
+ *
+ * @cmd:	Information to retrieve
+ * @info:	Character array of EC_INFO_MAX_SIZE bytes
+ *
+ * Returns 0 if successful and resulting string is in 'info'
+ * Returns -1 if the EC command fails
+ */
+int wilco_ec_get_info(enum get_ec_info_cmd cmd, char *info);
+
+/**
+ * wilco_ec_print_all_info
+ *
+ * Retrieve and print all the information strings from the EC:
+ *
+ *  GET_EC_LABEL
+ *  GET_EC_SVN_REV
+ *  GET_EC_MODEL_NO
+ *  GET_EC_BUILD_DATE
+ */
+void wilco_ec_print_all_info(void);
+
+#endif /* EC_GOOGLE_WILCO_COMMANDS_H */