94 lines
3.0 KiB
C
94 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* 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>
|
|
*
|
|
* 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 */
|