sb/amd/pi/hudson: select HAVE_CONFIGURABLE_APMC_SMI_PORT

Select HAVE_CONFIGURABLE_APMC_SMI_PORT and implement the
pm_acpi_smi_cmd_port helper function.

TEST=APU2 still compiles with HAVE_SMI_HANDLER selected and NO_SMM
select removed.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I8f79d8c1d59aa1b6c1145dd0b1cbc9010a1c57e7
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79849
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>

src/southbridge/amd/pi/hudson/Kconfig

@@ -13,6 +13,7 @@ config SOUTHBRIDGE_SPECIFIC_OPTIONS
 	select ACPI_COMMON_MADT_IOAPIC
 	select ACPI_COMMON_MADT_LAPIC
 	select ACPI_CUSTOM_MADT
+	select HAVE_CONFIGURABLE_APMC_SMI_PORT
 	select HAVE_USBDEBUG_OPTIONS
 	select HAVE_CF9_RESET
 	select HAVE_CF9_RESET_PREPARE

src/southbridge/amd/pi/hudson/smi_util.c

@@ -6,7 +6,9 @@
 
 #include <amdblocks/acpimmio.h>
 #include <console/console.h>
+#include <cpu/x86/smm.h>
 
+#include "hudson.h"
 #include "smi.h"
 
 #define HUDSON_SMI_ACPI_COMMAND		75
@@ -77,3 +79,8 @@ void hudson_enable_acpi_cmd_smi(void)
 {
 	configure_smi(HUDSON_SMI_ACPI_COMMAND, SMI_MODE_SMI);
 }
+
+uint16_t pm_acpi_smi_cmd_port(void)
+{
+	return pm_read16(PM_ACPI_SMI_CMD);
+}