mb/ocp/monolake: Add IPMI CMOS clear support

coreboot would clear CMOS by request via IPMI command, for example
BMC can issue "bios-util server --boot_order enable --clear_CMOS"
to set the request and reboot the system, then coreboot would clear CMOS
on the next boot.

Tested on Mono Lake

Change-Id: I21d44557896680cfac3c3b6d83e07b755b242cad
Signed-off-by: Johnny Lin <johnny_lin@wiwynn.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34857
Reviewed-by: Johnny Lin
Reviewed-by: Andrey Petrov <andrey.petrov@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/mainboard/ocp/monolake/ipmi.h b/src/mainboard/ocp/monolake/ipmi.h
new file mode 100644
index 0000000000..5863eb5082
--- /dev/null
+++ b/src/mainboard/ocp/monolake/ipmi.h
@@ -0,0 +1,53 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2019 Wiwynn Corp.
+ *
+ * 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 MONOLAKE_IPMI_H
+#define MONOLAKE_IPMI_H
+#include <types.h>
+
+#define IPMI_NETFN_OEM 0x30
+#define IPMI_OEM_SET_BIOS_BOOT_ORDER 0x52
+#define IPMI_OEM_GET_BIOS_BOOT_ORDER 0x53
+#define GET_CMOS_BIT(x) ((x) & (1 << 1))
+#define GET_VALID_BIT(x) ((x) & (1 << 7))
+#define CLEAR_CMOS_AND_VALID_BIT(x) ((x) &= 0x7d)
+
+typedef struct {
+	u8 BootMode; /* Bit 1:CMOS clear, bit 7:valid bit. */
+	u8 Boot0000;
+	u8 Boot0001;
+	u8 Boot0002;
+	u8 Boot0003;
+	u8 Boot0004;
+} __packed ipmi_oem_req_t;
+
+typedef struct {
+	u16 KcsRsp;
+	u8 CompletionCode;
+	ipmi_oem_req_t Data;
+} __packed ipmi_oem_rsp_t;
+
+/*
+ * IPMI get response to check if valid and CMOS clear bit
+ * are both set and store the IPMI response data to the parameter.
+ */
+int is_ipmi_clear_cmos_set(ipmi_oem_rsp_t *rsp);
+/*
+ * Clear valid bit and CMOS clear bit from the parameter
+ * and set it back via IPMI.
+ */
+void clear_ipmi_flags(ipmi_oem_rsp_t *rsp);
+
+#endif