vboot: remove init_vbnv_cmos()

Instead of having each potential caller deal with the differences
of cmos_init() and init_vbnv_cmos() when VBOOT is enabled put the
correct logic within the callee, cmos_init(), for handling the
vbnv in CMOS. The internal __cmos_init() routine returns when the
CMOS area was cleared.

BUG=b:63054105

Change-Id: Ia124bcd61d3ac03e899a4ecf3645fc4b7a558f03
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/21549
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/pc80/rtc/mc146818rtc.c

@@ -26,6 +26,8 @@
 #include <rtc.h>
 #include <string.h>
 #include <cbfs.h>
+#include <vboot/vbnv.h>
+#include <vboot/vbnv_layout.h>
 
 /* There's no way around this include guard. option_table.h is autogenerated */
 #if IS_ENABLED(CONFIG_USE_OPTION_TABLE)
@@ -95,7 +97,7 @@ static void cmos_set_checksum(int range_start, int range_end, int cks_loc)
 #define RTC_FREQ_SELECT_DEFAULT (RTC_REF_CLCK_32KHZ | RTC_RATE_1024HZ)
 
 #ifndef __SMM__
-void cmos_init(bool invalid)
+static bool __cmos_init(bool invalid)
 {
 	bool cmos_invalid;
 	bool checksum_invalid = false;
@@ -111,7 +113,7 @@ void cmos_init(bool invalid)
 	 * was due to the RTC alarm.
 	 */
 	if (acpi_is_wakeup_s3())
-		return;
+		return false;
 #endif /* __PRE_RAM__ */
 
 	printk(BIOS_DEBUG, "RTC Init\n");
@@ -150,7 +152,8 @@ void cmos_init(bool invalid)
 			cmos_invalid ? " Power Problem":"",
 			checksum_invalid ? " Checksum invalid":"",
 			clear_cmos ? " zeroing cmos":"");
-	}
+	} else
+		clear_cmos = false;
 
 	/* Setup the real time clock */
 	cmos_write(RTC_CONTROL_DEFAULT, RTC_CONTROL);
@@ -172,6 +175,31 @@ void cmos_init(bool invalid)
 
 	/* Clear any pending interrupts */
 	cmos_read(RTC_INTR_FLAGS);
+
+	return clear_cmos;
+}
+
+static void cmos_init_vbnv(bool invalid)
+{
+	uint8_t vbnv[VBOOT_VBNV_BLOCK_SIZE];
+
+	/* __cmos_init() will clear vbnv contents when a known rtc failure
+	   occurred with !CONFIG_USE_OPTION_TABLE. However, __cmos_init() may
+	   clear vbnv data for other internal reasons. For that, always back up
+	   the vbnv contents and conditionally save them when __cmos_init()
+	   indicates cmos was cleared. */
+	read_vbnv_cmos(vbnv);
+
+	if (__cmos_init(invalid))
+		save_vbnv_cmos(vbnv);
+}
+
+void cmos_init(bool invalid)
+{
+	if (IS_ENABLED(CONFIG_VBOOT_VBNV_CMOS))
+		cmos_init_vbnv(invalid);
+	else
+		__cmos_init(invalid);
 }
 #endif	/* __SMM__ */
 

src/soc/amd/stoneyridge/lpc.c

@@ -33,7 +33,6 @@
 #include <soc/pci_devs.h>
 #include <soc/southbridge.h>
 #include <soc/nvs.h>
-#include <vboot/vbnv.h>
 
 static void lpc_init(device_t dev)
 {
@@ -86,10 +85,7 @@ static void lpc_init(device_t dev)
 	 * update CMOS unless it is invalid.
 	 * 1 tells cmos_init to always initialize the CMOS.
 	 */
-	if (IS_ENABLED(CONFIG_VBOOT_VBNV_CMOS))
-		init_vbnv_cmos(0);
-	else
-		cmos_init(0);
+	cmos_init(0);
 
 	/* Initialize i8259 pic */
 	setup_i8259();

src/soc/intel/broadwell/lpc.c

@@ -44,8 +44,6 @@
 #include <arch/acpi.h>
 #include <arch/acpigen.h>
 #include <cpu/cpu.h>
-#include <vboot/vbnv.h>
-#include <vboot/vbnv_layout.h>
 
 static void pch_enable_ioapic(struct device *dev)
 {
@@ -193,10 +191,7 @@ static void pch_rtc_init(struct device *dev)
 		printk(BIOS_DEBUG, "rtc_failed = 0x%x\n", rtc_failed);
 	}
 
-	if (IS_ENABLED(CONFIG_VBOOT_VBNV_CMOS))
-		init_vbnv_cmos(rtc_failed);
-	else
-		cmos_init(rtc_failed);
+	cmos_init(rtc_failed);
 }
 
 static const struct reg_script pch_misc_init_script[] = {

src/soc/intel/common/block/rtc/rtc.c

@@ -17,7 +17,6 @@
 #include <intelblocks/rtc.h>
 #include <soc/pcr_ids.h>
 #include <pc80/mc146818rtc.h>
-#include <vboot/vbnv.h>
 
 /* RTC PCR configuration */
 #define PCR_RTC_CONF		0x3400
@@ -39,14 +38,8 @@ __attribute__((weak)) int soc_get_rtc_failed(void)
 
 void rtc_init(void)
 {
-	int rtc_failed;
-
-	rtc_failed = soc_get_rtc_failed();
 	/* Ensure the date is set including century byte. */
 	cmos_check_update_date();
 
-	if (IS_ENABLED(CONFIG_VBOOT_VBNV_CMOS))
-		init_vbnv_cmos(rtc_failed);
-	else
-		cmos_init(rtc_failed);
+	cmos_init(soc_get_rtc_failed());
 }

src/soc/intel/skylake/pmc.c

@@ -36,8 +36,6 @@
 #include <cpu/x86/smm.h>
 #include <soc/pcr_ids.h>
 #include <soc/ramstage.h>
-#include <vboot/vbnv.h>
-#include <vboot/vbnv_layout.h>
 
 static const struct reg_script pch_pmc_misc_init_script[] = {
 	/* SLP_S4=4s, SLP_S3=50ms, disable SLP_X stretching after SUS loss. */
@@ -124,10 +122,7 @@ static void pch_rtc_init(void)
 	/* Ensure the date is set including century byte. */
 	cmos_check_update_date();
 
-	if (IS_ENABLED(CONFIG_VBOOT_VBNV_CMOS))
-		init_vbnv_cmos(rtc_failed);
-	else
-		cmos_init(rtc_failed);
+	cmos_init(rtc_failed);
 }
 
 static void pch_power_options(void)

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

@@ -29,7 +29,6 @@
 #include <pc80/i8254.h>
 #include <pc80/i8259.h>
 #include "hudson.h"
-#include <vboot/vbnv.h>
 #include "pci_devs.h"
 
 static void lpc_init(device_t dev)
@@ -78,10 +77,7 @@ static void lpc_init(device_t dev)
 	 * update CMOS unless it is invalid.
 	 * 1 tells cmos_init to always initialize the CMOS.
 	 */
-	if (IS_ENABLED(CONFIG_VBOOT_VBNV_CMOS))
-		init_vbnv_cmos(0);
-	else
-		cmos_init(0);
+	cmos_init(0);
 
 	/* Initialize i8259 pic */
 	setup_i8259 ();

src/vboot/vbnv.h

@@ -30,7 +30,6 @@ int vboot_wants_oprom(void);
 /* CMOS backend */
 void read_vbnv_cmos(uint8_t *vbnv_copy);
 void save_vbnv_cmos(const uint8_t *vbnv_copy);
-void init_vbnv_cmos(int rtc_fail);
 
 /* Flash backend */
 void read_vbnv_flash(uint8_t *vbnv_copy);

src/vboot/vbnv_cmos.c

@@ -68,19 +68,6 @@ void save_vbnv_cmos(const uint8_t *vbnv_copy)
 		cmos_write(vbnv_copy[i], CONFIG_VBOOT_VBNV_OFFSET + 14 + i);
 }
 
-void init_vbnv_cmos(int rtc_fail)
-{
-	uint8_t vbnv[VBOOT_VBNV_BLOCK_SIZE];
-
-	if (rtc_fail)
-		read_vbnv_cmos(vbnv);
-
-	cmos_init(rtc_fail);
-
-	if (rtc_fail)
-		save_vbnv_cmos(vbnv);
-}
-
 #if IS_ENABLED(CONFIG_VBOOT_VBNV_CMOS_BACKUP_TO_FLASH)
 static void back_up_vbnv_cmos(void *unused)
 {