soc/amd/common/block/psp: add PSP command

Add PSP command to send SPL fuse command if PSP indicates SPL fusing
is required. Also add Kconfig option to enable sending message.

BUG=b:180701885
TEST=On a platform that supports SPL fusing. Build an image with an SPL
table indicating fusing is required, confirm that PSP indicates fusing
required and coreboot sends the appropriate command. A message indicating
PSP requested fusing will appear in the log: "PSP: Fuse SPL requested"

Signed-off-by: Jason Glenesk <jason.glenesk@amd.corp-partner.google.com>
Change-Id: If0575356a7c6172e2e0f2eaf9d1a6706468fe92d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61462
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: ritul guru <ritul.bits@gmail.com>

src/soc/amd/common/block/psp/Kconfig

@@ -35,3 +35,11 @@ config AMD_SOC_SEPARATE_EFS_SECTION
 	  FMAP section must begin exactly at the location the EFS needs to be
 	  placed in the flash. This option can be used to place the EFS right
 	  after the 128kByte EC firmware at the beginning of the flash.
+
+config SOC_AMD_COMMON_BLOCK_PSP_FUSE_SPL
+	bool
+	default n
+	depends on SOC_AMD_COMMON_BLOCK_PSP_GEN2
+	help
+	  Enable sending of set SPL message to PSP. Enable this option if the platform
+	  will require SPL fusing to be performed by PSP.

src/soc/amd/common/block/psp/psp_def.h

@@ -17,12 +17,18 @@
 #define MBOX_BIOS_CMD_CLEAR_S3_STS		0x07
 #define MBOX_BIOS_CMD_S3_DATA_INFO		0x08
 #define MBOX_BIOS_CMD_NOP			0x09
+#define MBOX_BIOS_CMD_SET_SPL_FUSE		0x2d
+#define MBOX_BIOS_CMD_QUERY_SPL_FUSE		0x47
 #define MBOX_BIOS_CMD_ABORT			0xfe
+
 /* x86 to PSP commands, v1-only */
 #define MBOX_BIOS_CMD_DRAM_INFO			0x01
 #define MBOX_BIOS_CMD_SMU_FW			0x19
 #define MBOX_BIOS_CMD_SMU_FW2			0x1a
 
+#define CORE_2_PSP_MSG_38_OFFSET		0x10998
+#define CORE_2_PSP_MSG_38_FUSE_SPL		BIT(12)
+
 /* generic PSP interface status, v1 */
 #define PSPV1_STATUS_INITIALIZED	BIT(0)
 #define PSPV1_STATUS_ERROR		BIT(1)
@@ -102,6 +108,11 @@ struct mbox_cmd_sx_info_buffer {
 	u8 sleep_type;
 } __attribute__((packed, aligned(32)));
 
+struct mbox_cmd_late_spl_buffer {
+	struct mbox_buffer_header header;
+	uint32_t	spl_value;
+} __attribute__((packed, aligned(32)));
+
 #define PSP_INIT_TIMEOUT 10000 /* 10 seconds */
 #define PSP_CMD_TIMEOUT 1000 /* 1 second */
 
@@ -110,4 +121,6 @@ void psp_print_cmd_status(int cmd_status, struct mbox_buffer_header *header);
 /* This command needs to be implemented by the generation specific code. */
 int send_psp_command(u32 command, void *buffer);
 
+enum cb_err soc_read_c2p38(uint32_t *msg_38_value);
+
 #endif /* __AMD_PSP_DEF_H__ */

src/soc/amd/common/block/psp/psp_gen2.c

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <bootstate.h>
 #include <console/console.h>
 #include <cpu/amd/msr.h>
 #include <cpu/x86/msr.h>
@@ -120,3 +121,44 @@ int send_psp_command(u32 command, void *buffer)
 
 	return 0;
 }
+
+enum cb_err soc_read_c2p38(uint32_t *msg_38_value)
+{
+	uintptr_t psp_mmio = soc_get_psp_base_address();
+
+	if (!psp_mmio) {
+		printk(BIOS_WARNING, "PSP: PSP_ADDR_MSR uninitialized\n");
+		return CB_ERR;
+	}
+	*msg_38_value = read32((void *)psp_mmio + CORE_2_PSP_MSG_38_OFFSET);
+	return CB_SUCCESS;
+}
+
+static void psp_set_spl_fuse(void *unused)
+{
+	if (!CONFIG(SOC_AMD_COMMON_BLOCK_PSP_FUSE_SPL))
+		return;
+
+	uint32_t msg_38_value = 0;
+	int cmd_status = 0;
+	struct mbox_cmd_late_spl_buffer buffer = {
+		.header = {
+			.size = sizeof(buffer)
+		}
+	};
+
+	if (soc_read_c2p38(&msg_38_value) != CB_SUCCESS) {
+		printk(BIOS_ERR, "PSP: Failed to read psp base address.\n");
+		return;
+	}
+
+	if (msg_38_value & CORE_2_PSP_MSG_38_FUSE_SPL) {
+		printk(BIOS_DEBUG, "PSP: Fuse SPL requested\n");
+		cmd_status = send_psp_command(MBOX_BIOS_CMD_SET_SPL_FUSE, &buffer);
+		psp_print_cmd_status(cmd_status, NULL);
+	} else {
+		printk(BIOS_DEBUG, "PSP: Fuse SPL not requested\n");
+	}
+}
+
+BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_BOOT, BS_ON_ENTRY, psp_set_spl_fuse, NULL);