soc/amd/psp: Add SmmInfo command

Implement the MboxBiosCmdSmmInfo function to inform the PSP of the SoC's
SMM configuration. Once the BootDone command is sent, the PSP only
responds to commands where the buffer is in SMM memory.

Set aside a region for the core-to-PSP command buffer and the
PSP-to-core mailbox. Also add an SMM flag, which the PSP expects to read
as non-zero during an SMI.

Add calls to soc functions for the soc to populate the trigger info and
register info (v2 only).

Add functions to set up the structures needed for the SmmInfo function
in Picasso support. Issue a SW SMI, and add a new handler to call the
new PSP function.

BUG=b:153677737

Change-Id: I10088a53e786db788740e4b388650641339dae75
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40295
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/soc/amd/picasso/smihandler.c b/src/soc/amd/picasso/smihandler.c
index 55493776dd..e4d1c86f57 100644
--- a/src/soc/amd/picasso/smihandler.c
+++ b/src/soc/amd/picasso/smihandler.c
@@ -26,6 +26,7 @@
 #include <soc/southbridge.h>
 #include <amdblocks/acpimmio.h>
 #include <amdblocks/acpi.h>
+#include <amdblocks/psp.h>
 #include <elog.h>
 
 /* bits in smm_io_trap   */
@@ -125,6 +126,9 @@ static void sb_apmc_smi_handler(void)
 		if (CONFIG(SMMSTORE))
 			southbridge_smi_store();
 		break;
+	case APM_CNT_SMMINFO:
+		psp_notify_smm();
+		break;
 	}
 
 	mainboard_smi_apmc(cmd);