1 files changed, 73 insertions, 0 deletions
diff --git a/src/soc/amd/picasso/reset.c b/src/soc/amd/picasso/reset.c
new file mode 100644
index 0000000000..ec5ee910d9
--- /dev/null
+++ b/src/soc/amd/picasso/reset.c
@@ -0,0 +1,73 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2010 Advanced Micro Devices, Inc.
+ * Copyright (C) 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.
+ */
+
+#include <arch/io.h>
+#include <reset.h>
+#include <soc/northbridge.h>
+#include <soc/pci_devs.h>
+#include <device/pci_ops.h>
+#include <soc/southbridge.h>
+#include <amdblocks/acpimmio.h>
+#include <amdblocks/reset.h>
+
+void set_warm_reset_flag(void)
+{
+	u32 htic;
+	htic = pci_read_config32(SOC_HT_DEV, HT_INIT_CONTROL);
+	htic |= HTIC_COLD_RST_DET;
+	pci_write_config32(SOC_HT_DEV, HT_INIT_CONTROL, htic);
+}
+
+int is_warm_reset(void)
+{
+	u32 htic;
+	htic = pci_read_config32(SOC_HT_DEV, HT_INIT_CONTROL);
+	return !!(htic & HTIC_COLD_RST_DET);
+}
+
+/* Clear bits 5, 9 & 10, used to signal the reset type */
+static void clear_bios_reset(void)
+{
+	u32 htic;
+	htic = pci_read_config32(SOC_HT_DEV, HT_INIT_CONTROL);
+	htic &= ~HTIC_BIOSR_DETECT;
+	pci_write_config32(SOC_HT_DEV, HT_INIT_CONTROL, htic);
+}
+
+void do_cold_reset(void)
+{
+	clear_bios_reset();
+
+	/* De-assert and then assert all PwrGood signals on CF9 reset. */
+	pm_write16(PWR_RESET_CFG, pm_read16(PWR_RESET_CFG) |
+		TOGGLE_ALL_PWR_GOOD);
+	outb(RST_CMD | SYS_RST, SYS_RESET);
+}
+
+void do_warm_reset(void)
+{
+	set_warm_reset_flag();
+	clear_bios_reset();
+
+	/* 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();
+}