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/*
* 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 */
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