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Diffstat (limited to 'src/soc/amd/picasso/reset.c')
-rw-r--r--src/soc/amd/picasso/reset.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/soc/amd/picasso/reset.c b/src/soc/amd/picasso/reset.c
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+++ b/src/soc/amd/picasso/reset.c
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+/*
+ * 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();
+}