[coreboot-gerrit] Change in coreboot[master]: [WIP] soc/intel/tigerlake: Configure top swap based on microcode version

[Jamie Ryu (Code Review)]

Jamie Ryu has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/46647 )

Change subject: [WIP] soc/intel/tigerlake: Configure top swap based on microcode version
......................................................................

[WIP] soc/intel/tigerlake: Configure top swap based on microcode version

In case of FIT based FW update feature is enabled, check that the
microcode has been loaded via FIT, if not, then disable top-swap so
that RO microcode is loaded on the next boot.

This is to make sure that the system always boots up with a microcode
loaded via FIT.

BUG=b:149547271
TEST=Build and boot volteer2 to OS

Signed-off-by: Jamie Ryu 
Change-Id: I25febfd946d5a82b92ba626e487eb183a0bd6286
---
M src/soc/intel/tigerlake/bootblock/report_platform.c
1 file changed, 16 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/47/46647/1

diff --git a/src/soc/intel/tigerlake/bootblock/report_platform.c b/src/soc/intel/tigerlake/bootblock/report_platform.c
index 03d65a4..1662ba5 100644
--- a/src/soc/intel/tigerlake/bootblock/report_platform.c
+++ b/src/soc/intel/tigerlake/bootblock/report_platform.c
@@ -18,6 +18,9 @@
 #include <soc/pch.h>
 #include <soc/pci_devs.h>
 #include <string.h>
+#include <intelblocks/rtc.h>
+#include <reset.h>
+#include <halt.h>

static struct {
    u32 cpuid;
@@ -106,6 +109,7 @@
    static const char *const mode[] = {"NOT ", ""};
    const char *cpu_type = "Unknown";
    u32 p[13];
+	u32 microcode_ver;

index = 0x80000000;
    cpuidr = cpuid(index);
@@ -137,9 +141,20 @@
    	}
    }

+	microcode_ver = get_current_microcode_rev();
    printk(BIOS_DEBUG, "CPU: %s\n", cpu_name);
    printk(BIOS_DEBUG, "CPU: ID %x, %s, ucode: %08x\n",
-	       cpu_id, cpu_type, get_current_microcode_rev());
+	       cpu_id, cpu_type, microcode_ver);
+
+	if(microcode_ver == 0x0) {
+		printk(BIOS_DEBUG, "CPU: ucode is not loaded, Disable top swap\n");
+		if (CONFIG(INTEL_TOP_SWAP_MULTI_FIT_UCODE_UPDATE)) {
+			configure_rtc_buc_top_swap(TS_DISABLE);
+			printk(BIOS_DEBUG, "CPU: Booting with top swap disabled\n");
+			do_board_reset();
+			halt();
+		}
+	}

cpu_feature_flag = cpu_get_feature_flags_ecx();
    aes = (cpu_feature_flag & CPUID_AES) ? 1 : 0;