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Diffstat (limited to 'include/faraday/ftwdt010_wdt.h')
| -rw-r--r-- | include/faraday/ftwdt010_wdt.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/include/faraday/ftwdt010_wdt.h b/include/faraday/ftwdt010_wdt.h new file mode 100644 index 0000000..31ca768 --- /dev/null +++ b/include/faraday/ftwdt010_wdt.h @@ -0,0 +1,106 @@ +/* + * 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 */ |