[WATCHDOG] NS pc87413-wdt Watchdog driver
New watchdog driver for the NS pc87413-wdt Watchdog Timer. Signed-off-by: Sven Anders <anders@anduras.de> Signed-off-by: Marcus Junker <junker@anduras.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>hifive-unleashed-5.1
Sven Anders & Marcus Junker
Wim Van Sebroeck
parent
cbf40d3f04
commit
789fc0adba
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@ -363,6 +363,20 @@ config SCx200_WDT
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If compiled as a module, it will be called scx200_wdt.
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config PC87413_WDT
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tristate "NS PC87413 watchdog"
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depends on WATCHDOG && X86
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---help---
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This is the driver for the hardware watchdog on the PC87413 chipset
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This watchdog simply watches your kernel to make sure it doesn't
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freeze, and if it does, it reboots your computer after a certain
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amount of time.
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To compile this driver as a module, choose M here: the
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module will be called pc87413_wdt.
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Most people will say N.
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config 60XX_WDT
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tristate "SBC-60XX Watchdog Timer"
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depends on WATCHDOG && X86
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@ -50,6 +50,7 @@ obj-$(CONFIG_I8XX_TCO) += i8xx_tco.o
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obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o
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obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
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obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o
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obj-$(CONFIG_PC87413_WDT) += pc87413_wdt.o
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obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o
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obj-$(CONFIG_SBC8360_WDT) += sbc8360.o
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obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o
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@ -0,0 +1,610 @@
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/*
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* NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x
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*
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* This code is based on wdt.c with original copyright
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*
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* (C) Copyright 2006 Marcus Junker, <junker@anduras.de>
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* and Sven Anders, <anders@anduras.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Neither Marcus Junker, Sven Anders nor ANDURAS AG
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* admit liability nor provide warranty for any of this software.
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* This material is provided "AS-IS" and at no charge.
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*
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* Release 1.00.
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*
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*/
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/* #define DEBUG 1 */
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/notifier.h>
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#include <linux/fs.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/moduleparam.h>
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#include <linux/version.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#define WATCHDOG_NAME "pc87413 WDT"
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#define PFX WATCHDOG_NAME ": "
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#define DPFX WATCHDOG_NAME " - DEBUG: "
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#define WDT_INDEX_IO_PORT (io+0) /* */
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#define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1)
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#define SWC_LDN 0x04
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#define SIOCFG2 0x22 /* Serial IO register */
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#define WDCTL 0x10 /* Watchdog-Timer-Controll-Register */
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#define WDTO 0x11 /* Watchdog timeout register */
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#define WDCFG 0x12 /* Watchdog config register */
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#define WD_TIMEOUT 1 /* minutes (1 ... 255) */
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static int pc87413_is_open=0;
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/*
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* You must set these - there is no sane way to probe for this board.
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* You can use pc87413=x to set these now.
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*/
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/**
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* module_params
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*
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* Setup options. The board isn't really probe-able so we have to
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* get the user to tell us the configuration.
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*/
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static int io=0x2E; /* Normally used addres on Portwell Boards */
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module_param(io, int, 0);
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MODULE_PARM_DESC(wdt_io, WATCHDOG_NAME " io port (default 0x2E)");
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static int timeout = WD_TIMEOUT; /* in minutes */
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes. 1<= timeout <=63, default=" __MODULE_STRING(WD_TIMEOUT) ".");
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/******************************************
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* Helper functions
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******************************************/
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static void
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pc87413_select_wdt_out (void)
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{
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unsigned int cr_data=0;
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/* Select multiple pin,pin55,as WDT output */
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outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
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cr_data = inb (WDT_DATA_IO_PORT);
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cr_data |= 0x80; /* Set Bit7 to 1*/
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outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
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outb_p(cr_data, WDT_DATA_IO_PORT);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", cr_data);
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#endif
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}
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static void
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pc87413_enable_swc(void)
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{
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unsigned int cr_data=0;
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/* Step 2: Enable SWC functions */
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outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */
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outb_p(SWC_LDN, WDT_DATA_IO_PORT);
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outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */
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cr_data = inb (WDT_DATA_IO_PORT);
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cr_data |= 0x01; /* Set Bit0 to 1 */
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outb_p(0x30, WDT_INDEX_IO_PORT);
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outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */
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#ifdef DEBUG
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printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n");
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#endif
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}
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static unsigned int
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pc87413_get_swc_base(void)
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{
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unsigned int swc_base_addr = 0;
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unsigned char addr_l, addr_h = 0;
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/* Step 3: Read SWC I/O Base Address */
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outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */
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addr_h = inb (WDT_DATA_IO_PORT);
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outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */
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addr_l = inb (WDT_DATA_IO_PORT);
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swc_base_addr = (addr_h << 8) + addr_l;
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#ifdef DEBUG
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printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d, res %d\n", addr_l, addr_h, swc_base_addr);
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#endif
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return swc_base_addr;
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}
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static void
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pc87413_swc_bank3(unsigned int swc_base_addr)
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{
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/* Step 4: Select Bank3 of SWC */
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outb_p (inb (swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "Select Bank3 of SWC\n");
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#endif
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}
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static void
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pc87413_programm_wdto (unsigned int swc_base_addr, char pc87413_time)
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{
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/* Step 5: Programm WDTO, Twd. */
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outb_p (pc87413_time, swc_base_addr + WDTO);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time);
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#endif
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}
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static void
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pc87413_enable_wden (unsigned int swc_base_addr)
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{
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/* Step 6: Enable WDEN */
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outb_p(inb (swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "Enable WDEN\n");
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#endif
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}
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static void
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pc87413_enable_sw_wd_tren (unsigned int swc_base_addr)
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{
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/* Enable SW_WD_TREN */
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outb_p(inb (swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "Enable SW_WD_TREN\n");
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#endif
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}
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static void
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pc87413_disable_sw_wd_tren (unsigned int swc_base_addr)
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{
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/* Disable SW_WD_TREN */
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outb_p(inb (swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n");
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#endif
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}
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static void
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pc87413_enable_sw_wd_trg (unsigned int swc_base_addr)
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{
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/* Enable SW_WD_TRG */
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outb_p(inb (swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n");
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#endif
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}
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static void
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pc87413_disable_sw_wd_trg (unsigned int swc_base_addr)
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{
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/* Disable SW_WD_TRG */
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outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "Disable SW_WD_TRG\n");
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#endif
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}
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static void
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pc87413_disable(void)
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{
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unsigned int swc_base_addr;
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pc87413_select_wdt_out();
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pc87413_enable_swc();
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swc_base_addr = pc87413_get_swc_base();
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pc87413_swc_bank3(swc_base_addr);
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pc87413_disable_sw_wd_tren(swc_base_addr);
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pc87413_disable_sw_wd_trg(swc_base_addr);
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pc87413_programm_wdto(swc_base_addr, 0);
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}
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static void
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pc87413_refresh(char pc87413_time)
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{
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unsigned int swc_base_addr;
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pc87413_select_wdt_out();
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pc87413_enable_swc();
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swc_base_addr = pc87413_get_swc_base();
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pc87413_swc_bank3(swc_base_addr);
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pc87413_disable_sw_wd_tren(swc_base_addr);
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pc87413_disable_sw_wd_trg(swc_base_addr);
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pc87413_programm_wdto(swc_base_addr, pc87413_time);
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pc87413_enable_wden(swc_base_addr);
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pc87413_enable_sw_wd_tren(swc_base_addr);
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pc87413_enable_sw_wd_trg(swc_base_addr);
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}
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static void
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pc87413_enable(char pc87413_time)
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{
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unsigned int swc_base_addr;
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pc87413_select_wdt_out();
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pc87413_enable_swc();
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swc_base_addr = pc87413_get_swc_base();
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pc87413_swc_bank3(swc_base_addr);
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pc87413_programm_wdto(swc_base_addr, pc87413_time);
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pc87413_enable_wden(swc_base_addr);
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pc87413_enable_sw_wd_tren(swc_base_addr);
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pc87413_enable_sw_wd_trg(swc_base_addr);
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}
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/*******************************************
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* Kernel methods.
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*******************************************/
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/**
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* pc87413_status:
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*
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* Extract the status information from a WDT watchdog device. There are
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* several board variants so we have to know which bits are valid. Some
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* bits default to one and some to zero in order to be maximally painful.
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*
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* we then map the bits onto the status ioctl flags.
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*/
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static int pc87413_status(void)
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{
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/* Not supported */
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return 1;
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}
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static long long pc87413_llseek(struct file *file, long long offset, int origin)
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{
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return -ESPIPE;
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}
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/**
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* pc87413_write:
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* @file: file handle to the watchdog
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* @buf: buffer to write (unused as data does not matter here
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* @count: count of bytes
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* @ppos: pointer to the position to write. No seeks allowed
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*
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* A write to a watchdog device is defined as a keepalive signal. Any
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* write of data will do, as we we don't define content meaning.
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*/
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static ssize_t
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pc87413_write (struct file *file, const char __user *buf, size_t count, loff_t *ppos)
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{
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if (count) {
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pc87413_refresh (WD_TIMEOUT);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "Write\n");
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#endif
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}
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return count;
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}
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/*
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* Read reports the temperature in degrees Fahrenheit.
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*/
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static ssize_t
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pc87413_read(struct file *file, char *buf, size_t count, loff_t *ptr)
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{
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// char timeout;
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//
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// outb_p(0x08, WDT_EFER); /* Select locical device 8 */
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// outb_p(0x0F6, WDT_EFER); /* Select CRF6 */
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// timeout = inb(WDT_EFDR); /* Read Timeout counter from CRF6 */
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// if(copy_to_user(buf,&timeout,1))
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// return -EFAULT;
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return 1;
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}
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/**
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* pc87413_ioctl:
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* @inode: inode of the device
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* @file: file handle to the device
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* @cmd: watchdog command
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* @arg: argument pointer
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*
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* The watchdog API defines a common set of functions for all watchdogs
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* according to their available features. We only actually usefully support
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* querying capabilities and current status.
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*/
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static int
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pc87413_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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static struct watchdog_info ident=
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{
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.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
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.firmware_version = 1,
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.identity = "pc87413(HF/F)"
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};
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ident.options=1; /* Mask down to the card we have */
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switch(cmd)
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{
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default:
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return -ENOIOCTLCMD;
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case WDIOC_GETSUPPORT:
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return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
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case WDIOC_GETSTATUS:
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return put_user(pc87413_status(),(int *)arg);
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, (int *)arg);
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case WDIOC_KEEPALIVE:
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pc87413_refresh(WD_TIMEOUT);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "keepalive\n");
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#endif
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return 0;
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}
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}
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/**
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* pc87413_open:
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* @inode: inode of device
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* @file: file handle to device
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*
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* One of our two misc devices has been opened. The watchdog device is
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* single open and on opening we load the counters. Counter zero is a
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* 100Hz cascade, into counter 1 which downcounts to reboot. When the
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* counter triggers counter 2 downcounts the length of the reset pulse
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* which set set to be as long as possible.
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*/
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static int
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pc87413_open(struct inode *inode, struct file *file)
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{
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switch(MINOR(inode->i_rdev))
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{
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case WATCHDOG_MINOR:
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if(pc87413_is_open)
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return -EBUSY;
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/*
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* Activate
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*/
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pc87413_is_open=1;
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pc87413_refresh(WD_TIMEOUT);
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#ifdef DEBUG
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printk(KERN_INFO DPFX "Open\n");
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#endif
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return 0;
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case TEMP_MINOR:
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return 0;
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default:
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return -ENODEV;
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}
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}
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/**
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* pc87413_close:
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* @inode: inode to board
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* @file: file handle to board
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*
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* The watchdog has a configurable API. There is a religious dispute
|
||||
* between people who want their watchdog to be able to shut down and
|
||||
* those who want to be sure if the watchdog manager dies the machine
|
||||
* reboots. In the former case we disable the counters, in the latter
|
||||
* case you have to open it again very soon.
|
||||
*/
|
||||
|
||||
static int
|
||||
pc87413_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
|
||||
{
|
||||
#ifndef CONFIG_WATCHDOG_NOWAYOUT
|
||||
pc87413_disable();
|
||||
#endif
|
||||
pc87413_is_open=0;
|
||||
#ifdef DEBUG
|
||||
printk(KERN_INFO DPFX "Release\n");
|
||||
#endif
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* notify_sys:
|
||||
* @this: our notifier block
|
||||
* @code: the event being reported
|
||||
* @unused: unused
|
||||
*
|
||||
* Our notifier is called on system shutdowns. We want to turn the card
|
||||
* off at reboot otherwise the machine will reboot again during memory
|
||||
* test or worse yet during the following fsck. This would suck, in fact
|
||||
* trust me - if it happens it does suck.
|
||||
*/
|
||||
|
||||
static int
|
||||
pc87413_notify_sys(struct notifier_block *this, unsigned long code,
|
||||
void *unused)
|
||||
{
|
||||
if(code==SYS_DOWN || code==SYS_HALT)
|
||||
{
|
||||
/* Turn the card off */
|
||||
pc87413_disable();
|
||||
}
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
|
||||
/*****************************************************
|
||||
* Kernel Interfaces
|
||||
*****************************************************/
|
||||
|
||||
|
||||
static struct file_operations pc87413_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = pc87413_llseek,
|
||||
.read = pc87413_read,
|
||||
.write = pc87413_write,
|
||||
.ioctl = pc87413_ioctl,
|
||||
.open = pc87413_open,
|
||||
.release = pc87413_release,
|
||||
};
|
||||
|
||||
static struct miscdevice pc87413_miscdev=
|
||||
{
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &pc87413_fops
|
||||
};
|
||||
|
||||
/*
|
||||
* The WDT card needs to learn about soft shutdowns in order to
|
||||
* turn the timebomb registers off.
|
||||
*/
|
||||
|
||||
static struct notifier_block pc87413_notifier=
|
||||
{
|
||||
pc87413_notify_sys,
|
||||
NULL,
|
||||
0
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* pc87413_exit:
|
||||
*
|
||||
* Unload the watchdog. You cannot do this with any file handles open.
|
||||
* If your watchdog is set to continue ticking on close and you unload
|
||||
* it, well it keeps ticking. We won't get the interrupt but the board
|
||||
* will not touch PC memory so all is fine. You just have to load a new
|
||||
* module in 60 seconds or reboot.
|
||||
*/
|
||||
|
||||
static void
|
||||
pc87413_exit(void)
|
||||
{
|
||||
pc87413_disable();
|
||||
misc_deregister(&pc87413_miscdev);
|
||||
unregister_reboot_notifier(&pc87413_notifier);
|
||||
/* release_region(io,2); */
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* pc87413_init:
|
||||
*
|
||||
* Set up the WDT watchdog board. All we have to do is grab the
|
||||
* resources we require and bitch if anyone beat us to them.
|
||||
* The open() function will actually kick the board off.
|
||||
*/
|
||||
|
||||
static int
|
||||
pc87413_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
printk(KERN_INFO PFX "Version 1.00 at io 0x%X\n", WDT_INDEX_IO_PORT);
|
||||
|
||||
|
||||
/* request_region(io, 2, "pc87413"); */
|
||||
|
||||
|
||||
ret = register_reboot_notifier(&pc87413_notifier);
|
||||
if (ret != 0) {
|
||||
printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
|
||||
ret);
|
||||
}
|
||||
|
||||
|
||||
|
||||
ret = misc_register(&pc87413_miscdev);
|
||||
|
||||
if (ret != 0) {
|
||||
printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
|
||||
WATCHDOG_MINOR, ret);
|
||||
unregister_reboot_notifier(&pc87413_notifier);
|
||||
return ret;
|
||||
}
|
||||
|
||||
printk (KERN_INFO PFX "initialized. timeout=%d min \n", timeout);
|
||||
|
||||
|
||||
pc87413_enable(WD_TIMEOUT);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
module_init(pc87413_init);
|
||||
module_exit(pc87413_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, Sven Anders <anders@anduras.de>");
|
||||
MODULE_DESCRIPTION("PC87413 WDT driver");
|
||||
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
||||
|
||||
Loading…
Reference in New Issue