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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * nv_tco: TCO timer driver for nVidia chipsets.
+ *
+ * (c) Copyright 2005 Google Inc., All Rights Reserved.
+ *
+ * Supported Chipsets:
+ * - MCP51/MCP55
+ *
+ * (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights
+ * Reserved.
+ * https://www.kernelconcepts.de
+ *
+ * Neither kernel concepts nor Nils Faerber admit liability nor provide
+ * warranty for any of this software. This material is provided
+ * "AS-IS" and at no charge.
+ *
+ * (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>
+ * developed for
+ * Jentro AG, Haar/Munich (Germany)
+ *
+ * TCO timer driver for NV chipsets
+ * based on softdog.c by Alan Cox <alan@redhat.com>
+ */
+
+/*
+ * Some address definitions for the TCO
+ */
+
+#define TCO_RLD(base) ((base) + 0x00) /* TCO Timer Reload and Current Value */
+#define TCO_TMR(base) ((base) + 0x01) /* TCO Timer Initial Value */
+
+#define TCO_STS(base) ((base) + 0x04) /* TCO Status Register */
+/*
+ * TCO Boot Status bit: set on TCO reset, reset by software or standby
+ * power-good (survives reboots), unfortunately this bit is never
+ * set.
+ */
+# define TCO_STS_BOOT_STS (1 << 9)
+/*
+ * first and 2nd timeout status bits, these also survive a warm boot,
+ * and they work, so we use them.
+ */
+# define TCO_STS_TCO_INT_STS (1 << 1)
+# define TCO_STS_TCO2TO_STS (1 << 10)
+# define TCO_STS_RESET (TCO_STS_BOOT_STS | TCO_STS_TCO2TO_STS | \
+ TCO_STS_TCO_INT_STS)
+
+#define TCO_CNT(base) ((base) + 0x08) /* TCO Control Register */
+# define TCO_CNT_TCOHALT (1 << 12)
+
+#define MCP51_SMBUS_SETUP_B 0xe8
+# define MCP51_SMBUS_SETUP_B_TCO_REBOOT (1 << 25)
+
+/*
+ * The SMI_EN register is at the base io address + 0x04,
+ * while TCOBASE is + 0x40.
+ */
+#define MCP51_SMI_EN(base) ((base) - 0x40 + 0x04)
+# define MCP51_SMI_EN_TCO ((1 << 4) | (1 << 5))