soc/intel/fsp_baytrail: Add VBOOT support

* Add vbnv_cmos_failed function to SoC.
* Add VBOOT starts in romstage select.

Change-Id: I90a051e2b8d303c918bef976d0bb07aae0b1f5b3
Signed-off-by: Philipp Deppenwiese <zaolin@das-labor.org>
Reviewed-on: https://review.coreboot.org/27728
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/soc/intel/fsp_baytrail/Kconfig

@@ -47,6 +47,9 @@ config CPU_SPECIFIC_OPTIONS
 	# Microcode header files are delivered in FSP package
 	select USES_MICROCODE_HEADER_FILES if HAVE_FSP_BIN
 
+config VBOOT
+	select VBOOT_STARTS_IN_ROMSTAGE
+
 config SOC_INTEL_FSP_BAYTRAIL_MD
 	bool
 	default n

src/soc/intel/fsp_baytrail/Makefile.inc

@@ -42,6 +42,7 @@ ramstage-y += northcluster.c
 ramstage-y += ramstage.c
 ramstage-y += gpio.c
 romstage-y += gpio.c
+romstage-y += pmutil.c
 ramstage-y += pmutil.c
 ramstage-y += southcluster.c
 romstage-y += reset.c

src/soc/intel/fsp_baytrail/pmutil.c

@@ -15,14 +15,16 @@
 
 #include <stdint.h>
 #include <arch/io.h>
+#include <cbmem.h>
 #include <console/console.h>
 
 #include <soc/iomap.h>
 #include <soc/lpc.h>
 #include <soc/pci_devs.h>
 #include <soc/pmc.h>
+#include <security/vboot/vbnv.h>
 
-#if defined(__SMM__)
+#if defined(__SIMPLE_DEVICE__)
 
 static const pci_devfn_t pcu_dev = PCI_DEV(0, PCU_DEV, 0);
 
@@ -31,7 +33,7 @@ static inline pci_devfn_t get_pcu_dev(void)
 	return pcu_dev;
 }
 
-#else /* !__SMM__ */
+#else /* !__SIMPLE_DEVICE__ */
 #include <device/device.h>
 #include <device/pci.h>
 
@@ -358,3 +360,22 @@ void clear_pmc_status(void)
 	write32((u32 *)(PMC_BASE_ADDRESS + GEN_PMCON1), gen_pmcon1 & ~RPS);
 	write32((u32 *)(PMC_BASE_ADDRESS + PRSTS), prsts);
 }
+
+int vbnv_cmos_failed(void)
+{
+	uint32_t gen_pmcon1;
+	int rtc_fail;
+	struct chipset_power_state *ps = cbmem_find(CBMEM_ID_POWER_STATE);
+
+	if (ps != NULL)
+		gen_pmcon1 = ps->gen_pmcon1;
+	else
+		gen_pmcon1 = read32((u32 *)(PMC_BASE_ADDRESS + GEN_PMCON1));
+
+	rtc_fail = !!(gen_pmcon1 & RPS);
+
+	if (rtc_fail)
+		printk(BIOS_DEBUG, "RTC failure.\n");
+
+	return rtc_fail;
+}