diff options
Diffstat (limited to 'drivers/watchdog/nv_tco.h')
| -rw-r--r-- | drivers/watchdog/nv_tco.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/watchdog/nv_tco.h b/drivers/watchdog/nv_tco.h new file mode 100644 index 000000000..c65f82588 --- /dev/null +++ b/drivers/watchdog/nv_tco.h @@ -0,0 +1,60 @@ +/* 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)) |