[WATCHDOG] NS pc87413-wdt Watchdog driver (789fc0ad) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/char/watchdog/Kconfig

+14 −0

Original line number	Diff line number	Diff line
		@@ -363,6 +363,20 @@ config SCx200_WDT

		If compiled as a module, it will be called scx200_wdt.

		config PC87413_WDT
		tristate "NS PC87413 watchdog"
		depends on WATCHDOG && X86
		---help---
		This is the driver for the hardware watchdog on the PC87413 chipset
		This watchdog simply watches your kernel to make sure it doesn't
		freeze, and if it does, it reboots your computer after a certain
		amount of time.

		To compile this driver as a module, choose M here: the
		module will be called pc87413_wdt.

		Most people will say N.

		config 60XX_WDT
		tristate "SBC-60XX Watchdog Timer"
		depends on WATCHDOG && X86

drivers/char/watchdog/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -50,6 +50,7 @@ obj-$(CONFIG_I8XX_TCO) += i8xx_tco.o
		obj-$(CONFIG_ITCO_WDT) += iTCO_wdt.o
		obj-$(CONFIG_SC1200_WDT) += sc1200wdt.o
		obj-$(CONFIG_SCx200_WDT) += scx200_wdt.o
		obj-$(CONFIG_PC87413_WDT) += pc87413_wdt.o
		obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o
		obj-$(CONFIG_SBC8360_WDT) += sbc8360.o
		obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o

drivers/char/watchdog/pc87413_wdt.c

0 → 100644

+610 −0

Original line number	Diff line number	Diff line
		/*
		* NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x
		*
		* This code is based on wdt.c with original copyright
		*
		* (C) Copyright 2006 Marcus Junker, <junker@anduras.de>
		* and Sven Anders, <anders@anduras.de>
		*
		* 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.
		*
		* Neither Marcus Junker, Sven Anders nor ANDURAS AG
		* admit liability nor provide warranty for any of this software.
		* This material is provided "AS-IS" and at no charge.
		*
		* Release 1.00.
		*
		*/


		/* #define DEBUG 1 */

		#include <linux/config.h>
		#include <linux/module.h>
		#include <linux/types.h>
		#include <linux/miscdevice.h>
		#include <linux/watchdog.h>
		#include <linux/ioport.h>
		#include <linux/delay.h>
		#include <linux/notifier.h>
		#include <linux/fs.h>
		#include <linux/reboot.h>
		#include <linux/init.h>
		#include <linux/spinlock.h>
		#include <linux/moduleparam.h>
		#include <linux/version.h>

		#include <asm/io.h>
		#include <asm/uaccess.h>
		#include <asm/system.h>

		#define WATCHDOG_NAME "pc87413 WDT"
		#define PFX WATCHDOG_NAME ": "
		#define DPFX WATCHDOG_NAME " - DEBUG: "

		#define WDT_INDEX_IO_PORT (io+0) /* */
		#define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1)
		#define SWC_LDN 0x04
		#define SIOCFG2 0x22 /* Serial IO register */
		#define WDCTL 0x10 /* Watchdog-Timer-Controll-Register */
		#define WDTO 0x11 /* Watchdog timeout register */
		#define WDCFG 0x12 /* Watchdog config register */

		#define WD_TIMEOUT 1 /* minutes (1 ... 255) */


		static int pc87413_is_open=0;

		/*
		* You must set these - there is no sane way to probe for this board.
		* You can use pc87413=x to set these now.
		*/



		/**
		* module_params
		*
		* Setup options. The board isn't really probe-able so we have to
		* get the user to tell us the configuration.
		*/

		static int io=0x2E; /* Normally used addres on Portwell Boards */
		module_param(io, int, 0);
		MODULE_PARM_DESC(wdt_io, WATCHDOG_NAME " io port (default 0x2E)");

		static int timeout = WD_TIMEOUT; /* in minutes */
		module_param(timeout, int, 0);
		MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes. 1<= timeout <=63, default=" __MODULE_STRING(WD_TIMEOUT) ".");


		/******************************************
		* Helper functions
		******************************************/

		static void
		pc87413_select_wdt_out (void)
		{

		unsigned int cr_data=0;

		/* Select multiple pin,pin55,as WDT output */

		outb_p(SIOCFG2, WDT_INDEX_IO_PORT);

		cr_data = inb (WDT_DATA_IO_PORT);

		cr_data \|= 0x80; /* Set Bit7 to 1*/
		outb_p(SIOCFG2, WDT_INDEX_IO_PORT);

		outb_p(cr_data, WDT_DATA_IO_PORT);


		#ifdef DEBUG
		printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", cr_data);
		#endif
		}

		static void
		pc87413_enable_swc(void)
		{

		unsigned int cr_data=0;

		/* Step 2: Enable SWC functions */

		outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */
		outb_p(SWC_LDN, WDT_DATA_IO_PORT);

		outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */
		cr_data = inb (WDT_DATA_IO_PORT);
		cr_data \|= 0x01; /* Set Bit0 to 1 */
		outb_p(0x30, WDT_INDEX_IO_PORT);
		outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */

		#ifdef DEBUG
		printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n");
		#endif
		}

		static unsigned int
		pc87413_get_swc_base(void)
		{
		unsigned int swc_base_addr = 0;
		unsigned char addr_l, addr_h = 0;

		/* Step 3: Read SWC I/O Base Address */

		outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */
		addr_h = inb (WDT_DATA_IO_PORT);

		outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */

		addr_l = inb (WDT_DATA_IO_PORT);


		swc_base_addr = (addr_h << 8) + addr_l;

		#ifdef DEBUG
		printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d, res %d\n", addr_l, addr_h, swc_base_addr);
		#endif

		return swc_base_addr;
		}

		static void
		pc87413_swc_bank3(unsigned int swc_base_addr)
		{
		/* Step 4: Select Bank3 of SWC */

		outb_p (inb (swc_base_addr + 0x0f) \| 0x03, swc_base_addr + 0x0f);

		#ifdef DEBUG
		printk(KERN_INFO DPFX "Select Bank3 of SWC\n");
		#endif

		}

		static void
		pc87413_programm_wdto (unsigned int swc_base_addr, char pc87413_time)
		{
		/* Step 5: Programm WDTO, Twd. */

		outb_p (pc87413_time, swc_base_addr + WDTO);

		#ifdef DEBUG
		printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time);
		#endif
		}

		static void
		pc87413_enable_wden (unsigned int swc_base_addr)
		{
		/* Step 6: Enable WDEN */

		outb_p(inb (swc_base_addr + WDCTL) \| 0x01, swc_base_addr + WDCTL);

		#ifdef DEBUG
		printk(KERN_INFO DPFX "Enable WDEN\n");
		#endif
		}

		static void
		pc87413_enable_sw_wd_tren (unsigned int swc_base_addr)
		{
		/* Enable SW_WD_TREN */

		outb_p(inb (swc_base_addr + WDCFG) \| 0x80, swc_base_addr + WDCFG);

		#ifdef DEBUG
		printk(KERN_INFO DPFX "Enable SW_WD_TREN\n");
		#endif
		}

		static void
		pc87413_disable_sw_wd_tren (unsigned int swc_base_addr)
		{
		/* Disable SW_WD_TREN */

		outb_p(inb (swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG);

		#ifdef DEBUG
		printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n");
		#endif
		}


		static void
		pc87413_enable_sw_wd_trg (unsigned int swc_base_addr)
		{

		/* Enable SW_WD_TRG */

		outb_p(inb (swc_base_addr + WDCTL) \| 0x80, swc_base_addr + WDCTL);

		#ifdef DEBUG
		printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n");
		#endif
		}

		static void
		pc87413_disable_sw_wd_trg (unsigned int swc_base_addr)
		{

		/* Disable SW_WD_TRG */

		outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);

		#ifdef DEBUG
		printk(KERN_INFO DPFX "Disable SW_WD_TRG\n");
		#endif
		}



		static void
		pc87413_disable(void)
		{
		unsigned int swc_base_addr;

		pc87413_select_wdt_out();
		pc87413_enable_swc();
		swc_base_addr = pc87413_get_swc_base();
		pc87413_swc_bank3(swc_base_addr);
		pc87413_disable_sw_wd_tren(swc_base_addr);
		pc87413_disable_sw_wd_trg(swc_base_addr);
		pc87413_programm_wdto(swc_base_addr, 0);
		}


		static void
		pc87413_refresh(char pc87413_time)
		{
		unsigned int swc_base_addr;

		pc87413_select_wdt_out();
		pc87413_enable_swc();
		swc_base_addr = pc87413_get_swc_base();
		pc87413_swc_bank3(swc_base_addr);
		pc87413_disable_sw_wd_tren(swc_base_addr);
		pc87413_disable_sw_wd_trg(swc_base_addr);
		pc87413_programm_wdto(swc_base_addr, pc87413_time);
		pc87413_enable_wden(swc_base_addr);
		pc87413_enable_sw_wd_tren(swc_base_addr);
		pc87413_enable_sw_wd_trg(swc_base_addr);
		}


		static void
		pc87413_enable(char pc87413_time)
		{
		unsigned int swc_base_addr;

		pc87413_select_wdt_out();
		pc87413_enable_swc();
		swc_base_addr = pc87413_get_swc_base();
		pc87413_swc_bank3(swc_base_addr);
		pc87413_programm_wdto(swc_base_addr, pc87413_time);
		pc87413_enable_wden(swc_base_addr);
		pc87413_enable_sw_wd_tren(swc_base_addr);
		pc87413_enable_sw_wd_trg(swc_base_addr);

		}


		/*******************************************
		* Kernel methods.
		*******************************************/


		/**
		* pc87413_status:
		*
		* Extract the status information from a WDT watchdog device. There are
		* several board variants so we have to know which bits are valid. Some
		* bits default to one and some to zero in order to be maximally painful.
		*
		* we then map the bits onto the status ioctl flags.
		*/

		static int pc87413_status(void)
		{
		/* Not supported */

		return 1;
		}

		static long long pc87413_llseek(struct file *file, long long offset, int origin)
		{
		return -ESPIPE;
		}

		/**
		* pc87413_write:
		* @file: file handle to the watchdog
		* @buf: buffer to write (unused as data does not matter here
		* @count: count of bytes
		* @ppos: pointer to the position to write. No seeks allowed
		*
		* A write to a watchdog device is defined as a keepalive signal. Any
		* write of data will do, as we we don't define content meaning.
		*/

		static ssize_t
		pc87413_write (struct file file, const char __user buf, size_t count, loff_t *ppos)
		{
		if (count) {
		pc87413_refresh (WD_TIMEOUT);
		#ifdef DEBUG
		printk(KERN_INFO DPFX "Write\n");
		#endif
		}
		return count;
		}

		/*
		* Read reports the temperature in degrees Fahrenheit.
		*/
		static ssize_t
		pc87413_read(struct file file, char buf, size_t count, loff_t *ptr)
		{

		// char timeout;
		//
		// outb_p(0x08, WDT_EFER); /* Select locical device 8 */
		// outb_p(0x0F6, WDT_EFER); /* Select CRF6 */
		// timeout = inb(WDT_EFDR); /* Read Timeout counter from CRF6 */


		// if(copy_to_user(buf,&timeout,1))
		// return -EFAULT;
		return 1;


		}

		/**
		* pc87413_ioctl:
		* @inode: inode of the device
		* @file: file handle to the device
		* @cmd: watchdog command
		* @arg: argument pointer
		*
		* The watchdog API defines a common set of functions for all watchdogs
		* according to their available features. We only actually usefully support
		* querying capabilities and current status.
		*/

		static int
		pc87413_ioctl(struct inode inode, struct file file, unsigned int cmd,
		unsigned long arg)
		{
		static struct watchdog_info ident=
		{
		.options = WDIOF_KEEPALIVEPING \| WDIOF_SETTIMEOUT \| WDIOF_MAGICCLOSE,
		.firmware_version = 1,
		.identity = "pc87413(HF/F)"
		};

		ident.options=1; /* Mask down to the card we have */

		switch(cmd)
		{
		default:
		return -ENOIOCTLCMD;
		case WDIOC_GETSUPPORT:
		return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
		case WDIOC_GETSTATUS:
		return put_user(pc87413_status(),(int *)arg);
		case WDIOC_GETBOOTSTATUS:
		return put_user(0, (int *)arg);
		case WDIOC_KEEPALIVE:
		pc87413_refresh(WD_TIMEOUT);
		#ifdef DEBUG
		printk(KERN_INFO DPFX "keepalive\n");
		#endif
		return 0;
		}
		}

		/**
		* pc87413_open:
		* @inode: inode of device
		* @file: file handle to device
		*
		* One of our two misc devices has been opened. The watchdog device is
		* single open and on opening we load the counters. Counter zero is a
		* 100Hz cascade, into counter 1 which downcounts to reboot. When the
		* counter triggers counter 2 downcounts the length of the reset pulse
		* which set set to be as long as possible.
		*/

		static int
		pc87413_open(struct inode inode, struct file file)
		{
		switch(MINOR(inode->i_rdev))
		{
		case WATCHDOG_MINOR:
		if(pc87413_is_open)
		return -EBUSY;
		/*
		* Activate
		*/

		pc87413_is_open=1;
		pc87413_refresh(WD_TIMEOUT);
		#ifdef DEBUG
		printk(KERN_INFO DPFX "Open\n");
		#endif
		return 0;
		case TEMP_MINOR:
		return 0;
		default:
		return -ENODEV;
		}
		}

		/**
		* pc87413_close:
		* @inode: inode to board
		* @file: file handle to board
		*
		* 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);