soc/amd: Implement common reset API

Add an `amdblocks` internal API and rename
  soft_reset() => warm_reset()
  hard_reset() => cold_reset()
as these terms are commonly used in the surrounding code.

On Stoney Ridge, make board_reset() call cold_reset() to keep
current behaviour of common code calling hard_reset(). But add
a TODO if this is intended.

Note: Stoney Ridge is using CF9 for the actual reset but the
configuration for a cold reset doesn't use the usual full reset
bit but some other mechanism.

Change-Id: Id33eda676d79529db759b85fa8e28386846e6fa4
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/29053
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>

src/soc/amd/common/block/include/amdblocks/reset.h

@@ -0,0 +1,42 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2017 Google, Inc.
+ *
+ * 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
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __AMD_RESET_H__
+#define __AMD_RESET_H__
+
+#include <console/console.h>
+#include <arch/cache.h>
+#include <halt.h>
+
+void do_warm_reset(void);
+void do_cold_reset(void);
+
+static inline __noreturn void warm_reset(void)
+{
+	printk(BIOS_INFO, "%s() called!\n", __func__);
+	dcache_clean_all();
+	do_warm_reset();
+	halt();
+}
+
+static inline __noreturn void cold_reset(void)
+{
+	printk(BIOS_INFO, "%s() called!\n", __func__);
+	dcache_clean_all();
+	do_cold_reset();
+	halt();
+}
+
+#endif /* __AMD_RESET_H__ */

src/soc/amd/common/block/pi/def_callouts.c

@@ -21,7 +21,7 @@
 #include <amdblocks/BiosCallOuts.h>
 #include <amdblocks/agesawrapper.h>
 #include <amdblocks/agesawrapper_call.h>
-#include <reset.h>
+#include <amdblocks/reset.h>
 #include <soc/southbridge.h>
 
 #if ENV_BOOTBLOCK
@@ -127,12 +127,12 @@ AGESA_STATUS agesa_Reset(UINT32 Func, UINTN Data, VOID *ConfigPtr)
 	switch (ResetType) {
 	case WARM_RESET_WHENEVER:
 	case WARM_RESET_IMMEDIATELY:
-		do_soft_reset();
+		warm_reset();
 		break;
 
 	case COLD_RESET_WHENEVER:
 	case COLD_RESET_IMMEDIATELY:
-		do_hard_reset();
+		cold_reset();
 		break;
 
 	default:

src/soc/amd/stoneyridge/Kconfig

@@ -39,7 +39,6 @@ config CPU_SPECIFIC_OPTIONS
 	select GENERIC_UDELAY
 	select IOAPIC
 	select HAVE_USBDEBUG_OPTIONS
-	select HAVE_HARD_RESET
 	select HAVE_MONOTONIC_TIMER
 	select SPI_FLASH if HAVE_ACPI_RESUME
 	select TSC_SYNC_LFENCE

src/soc/amd/stoneyridge/reset.c

@@ -20,6 +20,7 @@
 #include <soc/pci_devs.h>
 #include <device/pci_ops.h>
 #include <soc/southbridge.h>
+#include <amdblocks/reset.h>
 
 void set_warm_reset_flag(void)
 {
@@ -45,7 +46,7 @@ static void clear_bios_reset(void)
 	pci_write_config32(SOC_HT_DEV, HT_INIT_CONTROL, htic);
 }
 
-void do_hard_reset(void)
+void do_cold_reset(void)
 {
 	clear_bios_reset();
 
@@ -55,7 +56,7 @@ void do_hard_reset(void)
 	outb(RST_CMD | SYS_RST, SYS_RESET);
 }
 
-void do_soft_reset(void)
+void do_warm_reset(void)
 {
 	set_warm_reset_flag();
 	clear_bios_reset();
@@ -63,3 +64,9 @@ void do_soft_reset(void)
 	/* Assert reset signals only. */
 	outb(RST_CMD | SYS_RST, SYS_RESET);
 }
+
+void do_board_reset(void)
+{
+	/* TODO: Would a warm_reset() suffice? */
+	do_cold_reset();
+}

src/soc/amd/stoneyridge/southbridge.c

@@ -26,6 +26,7 @@
 #include <elog.h>
 #include <amdblocks/amd_pci_util.h>
 #include <amdblocks/agesawrapper.h>
+#include <amdblocks/reset.h>
 #include <soc/southbridge.h>
 #include <soc/smi.h>
 #include <soc/amd_pci_int_defs.h>
@@ -33,7 +34,6 @@
 #include <soc/pci_devs.h>
 #include <agesa_headers.h>
 #include <soc/nvs.h>
-#include <reset.h>
 
 /*
  * Table of devices that need their AOAC registers enabled and waited
@@ -639,7 +639,7 @@ void bootblock_fch_early_init(void)
 	setup_misc(&reboot);
 
 	if (reboot)
-		soft_reset();
+		warm_reset();
 
 	sb_enable_legacy_io();
 	enable_aoac_devices();