mb/ocp/deltalake: Send OEM IPMI command for CMOS clear on RTC failure

When RTC failure is detected, send IPMI OEM command to issue CMOS clear.
This is to let the payload (LinuxBoot) handle the IPMI OEM CMOS
clear command by resetting RTC data, erasing RW_VPD (TODO) and add a
SEL, then reboot the system.

Tested=on OCP Delta Lake, after removing RTC battery we can see the above
flow can be executed correctly.

Signed-off-by: Jingle Hsu <jingle_hsu@wiwynn.com>
Change-Id: I27428c02e99040754e15e07782ec1ad8524def2f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43005
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/src/mainboard/ocp/deltalake/ipmi.c b/src/mainboard/ocp/deltalake/ipmi.c
index 9c5a0c0cfe..790038f380 100644
--- a/src/mainboard/ocp/deltalake/ipmi.c
+++ b/src/mainboard/ocp/deltalake/ipmi.c
@@ -129,3 +129,51 @@ void init_frb2_wdt(void)
 		ipmi_stop_bmc_wdt(CONFIG_BMC_KCS_BASE);
 	}
 }
+
+enum cb_err ipmi_set_cmos_clear(void)
+{
+	int ret;
+
+	struct ipmi_oem_rsp {
+		struct ipmi_rsp resp;
+		struct boot_order data;
+	} __packed;
+
+	struct ipmi_oem_rsp rsp;
+	struct boot_order req;
+
+	/* IPMI OEM get bios boot order command to check if the valid bit and
+	   the CMOS clear bit are both set from the response BootMode byte. */
+
+	ret = ipmi_kcs_message(CONFIG_BMC_KCS_BASE, IPMI_NETFN_OEM, 0x0,
+			IPMI_OEM_GET_BIOS_BOOT_ORDER,
+			NULL, 0,
+			(unsigned char *) &rsp, sizeof(rsp));
+
+	if (ret < sizeof(struct ipmi_rsp) || rsp.resp.completion_code) {
+		printk(BIOS_ERR, "IPMI: %s command failed (read ret=%d resp=0x%x)\n",
+			__func__, ret, rsp.resp.completion_code);
+		return CB_ERR;
+	}
+
+	if (!IS_CMOS_AND_VALID_BIT(rsp.data.boot_mode)) {
+		req = rsp.data;
+		SET_CMOS_AND_VALID_BIT(req.boot_mode);
+		ret = ipmi_kcs_message(CONFIG_BMC_KCS_BASE, IPMI_NETFN_OEM, 0x0,
+				IPMI_OEM_SET_BIOS_BOOT_ORDER,
+				(const unsigned char *) &req, sizeof(req),
+				(unsigned char *) &rsp, sizeof(rsp));
+
+		if (ret < sizeof(struct ipmi_rsp) || rsp.resp.completion_code) {
+			printk(BIOS_ERR, "IPMI: %s command failed (sent ret=%d resp=0x%x)\n",
+				__func__, ret, rsp.resp.completion_code);
+			return CB_ERR;
+		}
+
+		printk(BIOS_INFO, "IPMI CMOS clear requested because CMOS data is invalid.\n");
+
+		return CB_SUCCESS;
+	}
+
+	return CB_SUCCESS;
+}