/* 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 <[email protected]>, 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 <[email protected]>
* developed for
* Jentro AG, Haar/Munich (Germany)
*
* TCO timer driver for NV chipsets
* based on softdog.c by Alan Cox <[email protected]>
*/
/*
* 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))
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