/* 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))