[Skiboot] [PATCH 2/2] astbmc: Introduce ISOLATE_SP IPMI OEM command

[Andrew Jeffery]

This is a trapdoor function for severing communications with the service
processor (BMC in this case) on platform exit.

Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
---
 include/platform.h        |  1 +
 platforms/astbmc/common.c | 20 +++++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/include/platform.h b/include/platform.h
index 1a35a86a6f8b..4cfc238fa8a0 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -42,6 +42,7 @@ struct bmc_platform {
 	 */
 	uint32_t ipmi_oem_partial_add_esel;
 	uint32_t ipmi_oem_pnor_access_status;
+	uint32_t ipmi_oem_isolate_sp;
 };
 
 /* OpenCAPI platform-specific I2C information */
diff --git a/platforms/astbmc/common.c b/platforms/astbmc/common.c
index 2c32db7295af..61b72f8b234f 100644
--- a/platforms/astbmc/common.c
+++ b/platforms/astbmc/common.c
@@ -433,9 +433,26 @@ static bool astbmc_isolate_via_io(void)
 	return ast_sio_disable();
 }
 
+static bool astbmc_ipmi_isolated = false;
+
+static void astbmc_ipmi_isolation_complete(struct ipmi_msg *msg)
+{
+	astbmc_ipmi_isolated = (msg->cc == IPMI_CC_NO_ERROR);
+}
+
 static bool astbmc_isolate_via_ipmi(void)
 {
-	return false;
+	const uint32_t code = bmc_platform->ipmi_oem_isolate_sp;
+	struct ipmi_msg *msg;
+
+	if (!code)
+		return false;
+
+	msg = ipmi_mkmsg(IPMI_DEFAULT_INTERFACE, code,
+			 astbmc_ipmi_isolation_complete, NULL, NULL, 0, 0);
+	ipmi_queue_msg_sync(msg);
+
+	return astbmc_ipmi_isolated;
 }
 
 static void astbmc_isolate(void)
@@ -469,4 +486,5 @@ const struct bmc_platform astbmc_ami = {
 const struct bmc_platform astbmc_openbmc = {
 	.name = "OpenBMC",
 	.ipmi_oem_partial_add_esel   = IPMI_CODE(0x3a, 0xf0),
+	.ipmi_oem_isolate_sp         = IPMI_CODE(0x32, 0xa5),
 };
-- 
2.17.1