soc/intel/baytrail: refactor rtc failure checking

In order to prepare for checking RTC failure in the early boot
paths move the rtc failure calculation to pmutil.c and add a helper
function to determine if failure occurred.

BUG=b:63054105

Change-Id: I1d90cc557225ddbba1787bf95eae0de623af487e
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/21555
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/baytrail/Makefile.inc

@@ -26,6 +26,7 @@ ramstage-y += gpio.c
 romstage-y += reset.c
 ramstage-y += reset.c
 ramstage-y += cpu.c
+romstage-y += pmutil.c
 ramstage-y += pmutil.c
 smm-y += pmutil.c
 smm-y += smihandler.c

src/soc/intel/baytrail/include/soc/pmc.h

@@ -288,6 +288,9 @@ void southcluster_log_state(void);
 static inline void southcluster_log_state(void) {}
 #endif
 
+/* Return non-zero when RTC failure happened. */
+int rtc_failure(void);
+
 #endif /* !defined(__ASSEMBLER__) && !defined(__ACPI__) */
 
 #endif /* _BAYTRAIL_PMC_H_ */

src/soc/intel/baytrail/pmutil.c

@@ -15,6 +15,7 @@
 
 #include <stdint.h>
 #include <arch/io.h>
+#include <cbmem.h>
 #include <console/console.h>
 
 #include <soc/iomap.h>
@@ -22,7 +23,7 @@
 #include <soc/pci_devs.h>
 #include <soc/pmc.h>
 
-#if defined(__SMM__)
+#if defined(__SIMPLE_DEVICE__)
 
 static const device_t pcu_dev = PCI_DEV(0, PCU_DEV, 0);
 
@@ -358,3 +359,22 @@ void clear_pmc_status(void)
 	write32((u32 *)(PMC_BASE_ADDRESS + GEN_PMCON1), gen_pmcon1 & ~RPS);
 	write32((u32 *)(PMC_BASE_ADDRESS + PRSTS), prsts);
 }
+
+int rtc_failure(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;
+}

src/soc/intel/baytrail/southcluster.c

@@ -125,23 +125,7 @@ static void sc_read_resources(device_t dev)
 
 static void sc_rtc_init(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");
-	}
-
-	cmos_init(rtc_fail);
+	cmos_init(rtc_failure());
 }
 
 /*