soc/intel/cannonlake: Add reset.c

Add reset functionality. This implementation relies on CSE to trigger
global reset.

Change-Id: I7e6ae07a48f1cdc3d2f4cdb74246627d27253adf
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/20070
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 100 insertions, 0 deletions

diff --git a/src/soc/intel/cannonlake/reset.c b/src/soc/intel/cannonlake/reset.c
new file mode 100644
index 0000000000..93714d3b9a
--- /dev/null
+++ b/src/soc/intel/cannonlake/reset.c
@@ -0,0 +1,100 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * 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 <intelblocks/cse.h>
+#include <fsp/util.h>
+#include <reset.h>
+#include <timer.h>
+
+/* Reset Request  */
+#define MKHI_GLOBAL_RESET			0x0b
+
+#define GR_ORIGIN_BIOS_MEM_INIT			0x01
+#define GR_ORIGIN_BIOS_POST			0x02
+#define GR_ORIGIN_MEBX				0x03
+
+#define GLOBAL_RST_TYPE				0x01
+
+#define BIOS_HOST_ADD				0x00
+#define HECI_MKHI_ADD				0x07
+
+static int send_heci_reset_message(void)
+{
+	int status;
+	struct reset_reply {
+		u8 group_id;
+		u8 command;
+		u8 reserved;
+		u8 result;
+	} __attribute__ ((packed)) reply;
+	struct reset_message {
+		u8 group_id;
+		u8 cmd;
+		u8 reserved;
+		u8 result;
+		u8 req_origin;
+		u8 reset_type;
+	} __attribute__ ((packed));
+	struct reset_message msg = {
+		.cmd = MKHI_GLOBAL_RESET,
+		.group_id = 0,
+		.reserved = 0,
+		.result = 0,
+		.req_origin = GR_ORIGIN_BIOS_POST,
+		.reset_type = GLOBAL_RST_TYPE
+	};
+	size_t reply_size;
+
+	heci_reset();
+
+	status = heci_send(&msg, sizeof(msg), BIOS_HOST_ADD, HECI_MKHI_ADD);
+	if (status != 1)
+		return -1;
+
+	reply_size = sizeof(reply);
+	heci_receive(&reply, &reply_size);
+	/* get reply result from HECI MSG  */
+	if (reply.result != 0) {
+		printk(BIOS_DEBUG, "%s: Exit with Failure\n", __func__);
+		return -1;
+	}
+	printk(BIOS_DEBUG, "%s: Exit with Success\n",  __func__);
+	return 0;
+}
+
+void do_global_reset(void)
+{
+	/* Ask CSE to do the global reset */
+	send_heci_reset_message();
+	/*
+	 * TODO: Presumbily we shouldn't return. But if we did, fallback to
+	 * alternative way of triggered global reset provided by pmclib.
+	 */
+}
+
+void chipset_handle_reset(uint32_t status)
+{
+	switch (status) {
+	case FSP_STATUS_RESET_REQUIRED_3: /* Global Reset */
+		printk(BIOS_DEBUG, "GLOBAL RESET!!\n");
+		do_global_reset();
+		break;
+	default:
+		printk(BIOS_ERR, "unhandled reset type %x\n", status);
+		die("unknown reset type");
+		break;
+	}
+}