drivers/elog,pc80: Move cmos_post_log()

Do this to remove elog header dependency from pc80/ and
remove some preprocessor guards.

Change-Id: I98044a28c29a2b1756fb25fb593f505e914a71c0
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38189
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/drivers/elog/elog.c

@@ -748,16 +748,35 @@ static bool elog_do_add_boot_count(void)
 #endif
 }
 
+/* Check and log POST codes from previous boot */
+static void log_last_boot_post(void)
+{
+#if CONFIG(ARCH_X86)
+	u8 code;
+	u32 extra;
+
+	if (!CONFIG(CMOS_POST))
+		return;
+
+	if (cmos_post_previous_boot(&code, &extra) == 0)
+		return;
+
+	printk(BIOS_WARNING, "POST: Unexpected post code/extra "
+	       "in previous boot: 0x%02x/0x%04x\n", code, extra);
+
+	elog_add_event_word(ELOG_TYPE_LAST_POST_CODE, code);
+	/* Always zero with !CMOS_POST_EXTRA. */
+	if (extra)
+		elog_add_event_dword(ELOG_TYPE_POST_EXTRA, extra);
+#endif
+}
+
 static void elog_add_boot_count(void)
 {
 	if (elog_do_add_boot_count()) {
 		elog_add_event_dword(ELOG_TYPE_BOOT, boot_count_read());
 
-#if CONFIG(ARCH_X86)
+		log_last_boot_post();
-		/* Check and log POST codes from previous boot */
-		if (CONFIG(CMOS_POST))
-			cmos_post_log();
-#endif
 	}
 }
 

src/drivers/pc80/rtc/post.c

@@ -2,7 +2,6 @@
 /* This file is part of the coreboot project. */
 
 #include <stdint.h>
-#include <elog.h>
 #include <console/console.h>
 #include <device/device.h>
 #include <pc80/mc146818rtc.h>
@@ -10,45 +9,41 @@
 
 DECLARE_SPIN_LOCK(cmos_post_lock)
 
-void cmos_post_log(void)
+int cmos_post_previous_boot(u8 *code, u32 *extra)
 {
-	u8 code = 0;
+	*code = 0;
-	u32 extra = 0;
+	*extra = 0;
 
 	spin_lock(&cmos_post_lock);
 
 	/* Get post code from other bank */
 	switch (cmos_read(CMOS_POST_BANK_OFFSET)) {
 	case CMOS_POST_BANK_0_MAGIC:
-		code = cmos_read(CMOS_POST_BANK_1_OFFSET);
+		*code = cmos_read(CMOS_POST_BANK_1_OFFSET);
 		if (CONFIG(CMOS_POST_EXTRA))
-			extra = cmos_read32(CMOS_POST_BANK_1_EXTRA);
+			*extra = cmos_read32(CMOS_POST_BANK_1_EXTRA);
 		break;
 	case CMOS_POST_BANK_1_MAGIC:
-		code = cmos_read(CMOS_POST_BANK_0_OFFSET);
+		*code = cmos_read(CMOS_POST_BANK_0_OFFSET);
 		if (CONFIG(CMOS_POST_EXTRA))
-			extra = cmos_read32(CMOS_POST_BANK_0_EXTRA);
+			*extra = cmos_read32(CMOS_POST_BANK_0_EXTRA);
 		break;
 	}
 
 	spin_unlock(&cmos_post_lock);
 
 	/* Check last post code in previous boot against normal list */
-	switch (code) {
+	switch (*code) {
 	case POST_OS_BOOT:
 	case POST_OS_RESUME:
 	case POST_ENTER_ELF_BOOT:
 	case 0:
 		break;
 	default:
-		printk(BIOS_WARNING, "POST: Unexpected post code "
+		return -1;
-		       "in previous boot: 0x%02x\n", code);
-#if CONFIG(ELOG) && (ENV_RAMSTAGE || CONFIG(ELOG_PRERAM))
-		elog_add_event_word(ELOG_TYPE_LAST_POST_CODE, code);
-		if (CONFIG(CMOS_POST_EXTRA) && extra)
-			elog_add_event_dword(ELOG_TYPE_POST_EXTRA, extra);
-#endif
 	}
+
+	return 0;
 }
 
 void cmos_post_init(void)

src/include/console/console.h

@@ -19,6 +19,7 @@
 void post_code(u8 value);
 void arch_post_code(u8 value);
 void cmos_post_code(u8 value);
+int cmos_post_previous_boot(u8 *code, u32 *extra);
 #if CONFIG(CMOS_POST_EXTRA)
 struct device;
 void post_log_path(const struct device *dev);

src/include/pc80/mc146818rtc.h

@@ -210,9 +210,6 @@ void cmos_set_checksum(int range_start, int range_end, int cks_loc);
 
 #define CMOS_POST_EXTRA_DEV_PATH  0x01
 
-void cmos_post_log(void);
-#else
-static inline void cmos_post_log(void) {}
 #endif /* CONFIG_CMOS_POST */
 
 #endif /* CONFIG_ARCH_X86 */