mb/ocp/deltalake: Configure IPMI FRB2 watchdog timer via VPD variables in romstage

Add VPD variables for enabling/disabling FRB2 watchdog timer and setting
the timer countdown value. By default it would start the timer and
trigger hard reset when it's expired. The timer is expected to be
stopped later by payload or OS.

Tested on OCP Delta Lake.

Change-Id: I3ce3bdc24a41d27eb1877655b3148ba02f7f5497
Signed-off-by: Johnny Lin <johnny_lin@wiwynn.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42495
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

4 files changed, 54 insertions, 0 deletions

diff --git a/src/mainboard/ocp/deltalake/ipmi.c b/src/mainboard/ocp/deltalake/ipmi.c
index f60abf2e5c..19a85d567c 100644
--- a/src/mainboard/ocp/deltalake/ipmi.c
+++ b/src/mainboard/ocp/deltalake/ipmi.c
@@ -3,8 +3,11 @@
 #include <console/console.h>
 #include <drivers/ipmi/ipmi_kcs.h>
 #include <drivers/ipmi/ipmi_ops.h>
+#include <drivers/vpd/vpd.h>
+#include <string.h>
 
 #include "ipmi.h"
+#include "vpd.h"
 
 enum cb_err ipmi_set_ppin(struct ppin_req *req)
 {
@@ -71,3 +74,33 @@ enum cb_err ipmi_get_slot_id(uint8_t *slot_id)
 
 	return CB_SUCCESS;
 }
+
+void init_frb2_wdt(void)
+{
+
+	char val[VPD_LEN];
+	/* Enable FRB2 timer by default. */
+	u8 enable = 1;
+	uint16_t countdown;
+
+	if (vpd_get_bool(FRB2_TIMER, VPD_RW_THEN_RO, &enable)) {
+		if (!enable) {
+			printk(BIOS_DEBUG, "Disable FRB2 timer\n");
+			ipmi_stop_bmc_wdt(CONFIG_BMC_KCS_BASE);
+			return;
+		}
+	}
+	if (enable) {
+		if (vpd_gets(FRB2_COUNTDOWN, val, VPD_LEN, VPD_RW_THEN_RO)) {
+			countdown = (uint16_t)atol(val);
+			printk(BIOS_DEBUG, "FRB2 timer countdown set to: %d ms\n",
+				countdown * 100);
+		} else {
+			printk(BIOS_DEBUG, "FRB2 timer use default value: %d ms\n",
+				DEFAULT_COUNTDOWN * 100);
+			countdown = DEFAULT_COUNTDOWN;
+		}
+		ipmi_init_and_start_bmc_wdt(CONFIG_BMC_KCS_BASE, countdown,
+			TIMEOUT_HARD_RESET);
+	}
+}
diff --git a/src/mainboard/ocp/deltalake/ipmi.h b/src/mainboard/ocp/deltalake/ipmi.h
index 039c576847..840f999990 100644
--- a/src/mainboard/ocp/deltalake/ipmi.h
+++ b/src/mainboard/ocp/deltalake/ipmi.h
@@ -28,4 +28,5 @@ struct ppin_req {
 enum cb_err ipmi_set_ppin(struct ppin_req *req);
 enum cb_err ipmi_get_pcie_config(uint8_t *config);
 enum cb_err ipmi_get_slot_id(uint8_t *slot_id);
+void init_frb2_wdt(void);
 #endif
diff --git a/src/mainboard/ocp/deltalake/romstage.c b/src/mainboard/ocp/deltalake/romstage.c
index 68ff113474..3389e6efbe 100644
--- a/src/mainboard/ocp/deltalake/romstage.c
+++ b/src/mainboard/ocp/deltalake/romstage.c
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <console/console.h>
+#include <drivers/ipmi/ipmi_kcs.h>
 #include <fsp/api.h>
 #include <FspmUpd.h>
 #include <soc/romstage.h>
@@ -60,6 +61,11 @@ static void mainboard_config_iio(FSPM_UPD *mupd)
 
 void mainboard_memory_init_params(FSPM_UPD *mupd)
 {
+	/* Since it's the first IPMI command, it's better to run get BMC
+	   selftest result first */
+	if (ipmi_kcs_premem_init(CONFIG_BMC_KCS_BASE, 0) == CB_SUCCESS)
+		init_frb2_wdt();
+
 	mainboard_config_gpios(mupd);
 	mainboard_config_iio(mupd);
 }
diff --git a/src/mainboard/ocp/deltalake/vpd.h b/src/mainboard/ocp/deltalake/vpd.h
new file mode 100644
index 0000000000..65aae72895
--- /dev/null
+++ b/src/mainboard/ocp/deltalake/vpd.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef DELTALAKE_VPD_H
+#define DELTALAKE_VPD_H
+
+/* VPD variable for enabling/disabling FRB2 timer. */
+#define FRB2_TIMER "frb2_timer"
+/* VPD variable for setting FRB2 timer countdown value. */
+#define FRB2_COUNTDOWN "frb2_countdown"
+#define VPD_LEN 10
+/* Default countdown is 15 minutes. */
+#define DEFAULT_COUNTDOWN 9000
+
+#endif