Change in coreboot[master]: soc/intel/xeon_sp/: Fix SMI_LOCK setting

[Marc Jones (Code Review)]

Marc Jones has submitted this change. ( https://review.coreboot.org/c/coreboot/+/51452 )

Change subject: soc/intel/xeon_sp/: Fix SMI_LOCK setting
......................................................................

soc/intel/xeon_sp/: Fix SMI_LOCK setting

Move the SMI_LOCK to post SMM setup. Also, use the correct access
method for SMI_LOCK. GEN_PMCON_A is in PCI config space and not
in MMIO space on this PCH.

Change-Id: Ibbb183ef61ca7330198c1243ecfc2d4df51e652b
Signed-off-by: Marc Jones 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51452
Reviewed-by: Arthur Heymans 
Reviewed-by: Jay Talbott 
Tested-by: build bot (Jenkins) 
---
M src/soc/intel/xeon_sp/cpx/cpu.c
M src/soc/intel/xeon_sp/include/soc/pm.h
M src/soc/intel/xeon_sp/lockdown.c
M src/soc/intel/xeon_sp/pmc.c
4 files changed, 14 insertions(+), 16 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Arthur Heymans: Looks good to me, approved
  Jay Talbott: Looks good to me, but someone else must approve

diff --git a/src/soc/intel/xeon_sp/cpx/cpu.c b/src/soc/intel/xeon_sp/cpx/cpu.c
index b3ab236..339bf09 100644
--- a/src/soc/intel/xeon_sp/cpx/cpu.c
+++ b/src/soc/intel/xeon_sp/cpx/cpu.c
@@ -16,8 +16,10 @@
 #include <cpu/x86/mtrr.h>
 #include <intelblocks/cpulib.h>
 #include <intelblocks/mp_init.h>
+#include <intelpch/lockdown.h>
 #include <soc/cpu.h>
 #include <soc/msr.h>
+#include <soc/pm.h>
 #include <soc/soc_util.h>
 #include <soc/smmrelocate.h>
 #include <soc/util.h>
@@ -175,8 +177,11 @@
    /* Set Max Ratio */
    set_max_turbo_freq();

-	if (CONFIG(HAVE_SMI_HANDLER))
+	if (CONFIG(HAVE_SMI_HANDLER)) {
    	global_smi_enable();
+		if (get_lockdown_config() == CHIPSET_LOCKDOWN_COREBOOT)
+			pmc_lock_smi();
+	}
 }

static const struct mp_ops mp_ops = {
diff --git a/src/soc/intel/xeon_sp/include/soc/pm.h b/src/soc/intel/xeon_sp/include/soc/pm.h
index 2673320..8c26c6a 100644
--- a/src/soc/intel/xeon_sp/include/soc/pm.h
+++ b/src/soc/intel/xeon_sp/include/soc/pm.h
@@ -125,4 +125,6 @@

uint16_t get_pmbase(void);

+void pmc_lock_smi(void);
+
 #endif
diff --git a/src/soc/intel/xeon_sp/lockdown.c b/src/soc/intel/xeon_sp/lockdown.c
index 0e21680..3a12110 100644
--- a/src/soc/intel/xeon_sp/lockdown.c
+++ b/src/soc/intel/xeon_sp/lockdown.c
@@ -16,18 +16,6 @@
    }
 }

-static void pmc_lock_smi(void)
-{
-	uint8_t *pmcbase;
-	uint8_t reg8;
-
-	pmcbase = pmc_mmio_regs();
-
-	reg8 = read8(pmcbase + GEN_PMCON_A);
-	reg8 |= SMI_LOCK;
-	write8(pmcbase + GEN_PMCON_A, reg8);
-}
-
 static void pmc_lockdown_config(int chipset_lockdown)
 {
    uint8_t *pmcbase;
@@ -41,9 +29,6 @@

/* Make sure payload/OS can't trigger global reset */
    pmc_global_reset_disable_and_lock();
-
-	if (chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT)
-		pmc_lock_smi();
 }

void soc_lockdown_config(int chipset_lockdown)
diff --git a/src/soc/intel/xeon_sp/pmc.c b/src/soc/intel/xeon_sp/pmc.c
index b4f86db..7f59555 100644
--- a/src/soc/intel/xeon_sp/pmc.c
+++ b/src/soc/intel/xeon_sp/pmc.c
@@ -163,6 +163,12 @@
    return ACPI_BASE_ADDRESS;
 }

+void pmc_lock_smi(void)
+{
+	printk(BIOS_DEBUG, "Locking SMM enable.\n");
+	pci_or_config32(PCH_DEV_PMC, GEN_PMCON_A, SMI_LOCK);
+}
+
 const char *const *soc_smi_sts_array(size_t *smi_arr)
 {
    static const char *const smi_sts_bits[] = {