mirror of
https://github.com/AsahiLinux/u-boot
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6e44bb0c10
The ftwdt010 watchdog driver was deleted by
commit 11232139e3 ("nds32: Remove the architecture")
Return it to the codebase in a DM compatible form. Enable it in
sandbox_defconfig to test compilability.
Another platform using ftwdt010 will be submitted later.
Signed-off-by: Sergei Antonov <saproj@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Watchdog driver for the FTWDT010 Watch Dog Driver
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*
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* (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
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* Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
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* Based on SoftDog driver by Alan Cox <alan@redhat.com>
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*
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* Copyright (C) 2011 Andes Technology Corporation
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* Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
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*
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* 27/11/2004 Initial release, Faraday.
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* 12/01/2011 Port to u-boot, Macpaul Lin.
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*/
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#ifndef __FTWDT010_H
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#define __FTWDT010_H
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#include <clock_legacy.h>
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struct ftwdt010_wdt {
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unsigned int wdcounter; /* Counter Reg - 0x00 */
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unsigned int wdload; /* Counter Auto Reload Reg - 0x04 */
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unsigned int wdrestart; /* Counter Restart Reg - 0x08 */
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unsigned int wdcr; /* Control Reg - 0x0c */
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unsigned int wdstatus; /* Status Reg - 0x10 */
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unsigned int wdclear; /* Timer Clear - 0x14 */
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unsigned int wdintrlen; /* Interrupt Length - 0x18 */
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};
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/*
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* WDLOAD - Counter Auto Reload Register
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* The Auto Reload Register is set to 0x03EF1480 (66Mhz) by default.
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* Which means in a 66MHz system, the period of Watch Dog timer reset is
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* one second.
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*/
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#define FTWDT010_WDLOAD(x) ((x) & 0xffffffff)
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/*
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* WDRESTART - Watch Dog Timer Counter Restart Register
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* If writing 0x5AB9 to WDRESTART register, Watch Dog timer will
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* automatically reload WDLOAD to WDCOUNTER and restart counting.
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*/
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#define FTWDT010_WDRESTART_MAGIC 0x5AB9
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/* WDCR - Watch Dog Timer Control Register */
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#define FTWDT010_WDCR_ENABLE (1 << 0)
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#define FTWDT010_WDCR_RST (1 << 1)
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#define FTWDT010_WDCR_INTR (1 << 2)
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/* FTWDT010_WDCR_EXT bit: Watch Dog Timer External Signal Enable */
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#define FTWDT010_WDCR_EXT (1 << 3)
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/* FTWDT010_WDCR_CLOCK bit: Clock Source: 0: PCLK, 1: EXTCLK.
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* The clock source PCLK cannot be gated when system sleeps, even if
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* WDCLOCK bit is turned on.
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*
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* Faraday's Watch Dog timer can be driven by an external clock. The
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* programmer just needs to write one to WdCR[WdClock] bit.
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*
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* Note: There is a limitation between EXTCLK and PCLK:
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* EXTCLK cycle time / PCLK cycle time > 2.
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* If the system does not need an external clock,
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* just keep WdCR[WdClock] bit in its default value.
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*/
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#define FTWDT010_WDCR_CLOCK (1 << 4)
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/*
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* WDSTATUS - Watch Dog Timer Status Register
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* This bit is set when the counter reaches Zero
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*/
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#define FTWDT010_WDSTATUS(x) ((x) & 0x1)
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/*
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* WDCLEAR - Watch Dog Timer Clear Register
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* Writing one to this register will clear WDSTATUS.
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*/
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#define FTWDT010_WDCLEAR (1 << 0)
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/*
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* WDINTRLEN - Watch Dog Timer Interrupt Length
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* This register controls the duration length of wd_rst, wd_intr and wd_ext.
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* The default value is 0xFF.
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*/
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#define FTWDT010_WDINTRLEN(x) ((x) & 0xff)
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/*
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* Variable timeout should be set in ms.
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* (get_board_sys_clk()/1000) equals 1 ms.
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* WDLOAD = timeout * TIMEOUT_FACTOR.
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*/
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#define FTWDT010_TIMEOUT_FACTOR (get_board_sys_clk() / 1000) /* 1 ms */
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#endif /* __FTWDT010_H */
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