| /* |
| * Watchdog driver for the FTWDT010 Watch Dog Driver |
| * |
| * (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com) |
| * Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu> |
| * Based on SoftDog driver by Alan Cox <alan@redhat.com> |
| * |
| * Copyright (C) 2011 Andes Technology Corporation |
| * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com> |
| * |
| * 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; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| * |
| * 27/11/2004 Initial release, Faraday. |
| * 12/01/2011 Port to u-boot, Macpaul Lin. |
| */ |
| |
| #ifndef __FTWDT010_H |
| #define __FTWDT010_H |
| |
| struct ftwdt010_wdt { |
| unsigned int wdcounter; /* Counter Reg - 0x00 */ |
| unsigned int wdload; /* Counter Auto Reload Reg - 0x04 */ |
| unsigned int wdrestart; /* Counter Restart Reg - 0x08 */ |
| unsigned int wdcr; /* Control Reg - 0x0c */ |
| unsigned int wdstatus; /* Status Reg - 0x10 */ |
| unsigned int wdclear; /* Timer Clear - 0x14 */ |
| unsigned int wdintrlen; /* Interrupt Length - 0x18 */ |
| }; |
| |
| /* |
| * WDLOAD - Counter Auto Reload Register |
| * The Auto Reload Register is set to 0x03EF1480 (66Mhz) by default. |
| * Which means in a 66MHz system, the period of Watch Dog timer reset is |
| * one second. |
| */ |
| #define FTWDT010_WDLOAD(x) ((x) & 0xffffffff) |
| |
| /* |
| * WDRESTART - Watch Dog Timer Counter Restart Register |
| * If writing 0x5AB9 to WDRESTART register, Watch Dog timer will |
| * automatically reload WDLOAD to WDCOUNTER and restart counting. |
| */ |
| #define FTWDT010_WDRESTART_MAGIC 0x5AB9 |
| |
| /* WDCR - Watch Dog Timer Control Register */ |
| #define FTWDT010_WDCR_ENABLE (1 << 0) |
| #define FTWDT010_WDCR_RST (1 << 1) |
| #define FTWDT010_WDCR_INTR (1 << 2) |
| /* FTWDT010_WDCR_EXT bit: Watch Dog Timer External Signal Enable */ |
| #define FTWDT010_WDCR_EXT (1 << 3) |
| /* FTWDT010_WDCR_CLOCK bit: Clock Source: 0: PCLK, 1: EXTCLK. |
| * The clock source PCLK cannot be gated when system sleeps, even if |
| * WDCLOCK bit is turned on. |
| * |
| * Faraday's Watch Dog timer can be driven by an external clock. The |
| * programmer just needs to write one to WdCR[WdClock] bit. |
| * |
| * Note: There is a limitation between EXTCLK and PCLK: |
| * EXTCLK cycle time / PCLK cycle time > 2. |
| * If the system does not need an external clock, |
| * just keep WdCR[WdClock] bit in its default value. |
| */ |
| #define FTWDT010_WDCR_CLOCK (1 << 4) |
| |
| /* |
| * WDSTATUS - Watch Dog Timer Status Register |
| * This bit is set when the counter reaches Zero |
| */ |
| #define FTWDT010_WDSTATUS(x) ((x) & 0x1) |
| |
| /* |
| * WDCLEAR - Watch Dog Timer Clear Register |
| * Writing one to this register will clear WDSTATUS. |
| */ |
| #define FTWDT010_WDCLEAR (1 << 0) |
| |
| /* |
| * WDINTRLEN - Watch Dog Timer Interrupt Length |
| * This register controls the duration length of wd_rst, wd_intr and wd_ext. |
| * The default value is 0xFF. |
| */ |
| #define FTWDT010_WDINTRLEN(x) ((x) & 0xff) |
| |
| /* |
| * Variable timeout should be set in ms. |
| * (CONFIG_SYS_CLK_FREQ/1000) equals 1 ms. |
| * WDLOAD = timeout * TIMEOUT_FACTOR. |
| */ |
| #define FTWDT010_TIMEOUT_FACTOR (CONFIG_SYS_CLK_FREQ / 1000) /* 1 ms */ |
| |
| void ftwdt010_wdt_reset(void); |
| void ftwdt010_wdt_disable(void); |
| |
| #endif /* __FTWDT010_H */ |
