New patch to review for coreboot: sb/amd/sb700: Add sb7xx_51xx_decode_last_reset()

[Timothy Pearson]

Timothy Pearson ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/14263

-gerrit

commit 300ae6c76689b49f809c59cd5ff754bbc3e8a3ba
Author: Timothy Pearson 
Date:   Wed Apr 6 13:18:52 2016 -0500

sb/amd/sb700: Add sb7xx_51xx_decode_last_reset()

The SB700 family has the ability to report the last reset
    reason.  This is useful in the context of handling MCEs
    and recovering from fatal errors / sync floods.

Add a function to retrieve the last reset flags.

Change-Id: I754cb25e47bd9c1e4a29ecb6cb18017d1b7c3dc4
    Signed-off-by: Timothy Pearson 
---
 src/southbridge/amd/sb700/early_setup.c | 13 ++++++++++++-
 src/southbridge/amd/sb700/sb700.h       |  1 +
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/southbridge/amd/sb700/early_setup.c b/src/southbridge/amd/sb700/early_setup.c
index 8042849..ffdd34b 100644
--- a/src/southbridge/amd/sb700/early_setup.c
+++ b/src/southbridge/amd/sb700/early_setup.c
@@ -2,7 +2,7 @@
  * This file is part of the coreboot project.
  *
  * Copyright (C) 2010 Advanced Micro Devices, Inc.
- * Copyright (C) 2015 Timothy Pearson , Raptor Engineering
+ * Copyright (C) 2015 - 2016 Raptor Engineering, LLC
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -758,6 +758,17 @@ static void sb700_por_init(void)
    sb700_pmio_por_init();
 }

+uint16_t sb7xx_51xx_decode_last_reset(void) {
+	uint16_t reset_status = 0;
+	reset_status |= pmio_read(0x44);
+	reset_status |= (pmio_read(0x45) << 8);
+	printk(BIOS_INFO, "sb700 reset flags: %04x\n", reset_status);
+	if (reset_status & (0x1 << 10))
+		printk(BIOS_WARNING, "WARNING: Last reset was caused by fatal error / sync flood!\n");
+
+	return reset_status;
+}
+
 /*
 * It should be called during early POST after memory detection and BIOS shadowing but before PCI bus enumeration.
 */
diff --git a/src/southbridge/amd/sb700/sb700.h b/src/southbridge/amd/sb700/sb700.h
index f895811..f23956c 100644
--- a/src/southbridge/amd/sb700/sb700.h
+++ b/src/southbridge/amd/sb700/sb700.h
@@ -66,6 +66,7 @@ void sb7xx_51xx_enable_wideio(u8 wio_index, u16 base);
 void sb7xx_51xx_disable_wideio(u8 wio_index);
 void sb7xx_51xx_early_setup(void);
 void sb7xx_51xx_before_pci_init(void);
+uint16_t sb7xx_51xx_decode_last_reset(void);
 #else
 #include <device/pci.h>
 /* allow override in mainboard.c */