diff options
author | Sven Anders & Marcus Junker <anders@anduras.de, junker@anduras.de> | 2006-08-24 17:11:50 +0200 |
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committer | Wim Van Sebroeck <wim@iguana.be> | 2006-10-15 20:04:59 +0200 |
commit | 789fc0adbaf3a3ca95a3894aedacfc01863e8ae3 (patch) | |
tree | 095a8e2abad707c245f16126925553fc44a58a4d /drivers/char/watchdog/pc87413_wdt.c | |
parent | cbf40d3f04c2c76a58f1183bb4a9a82fefb842e3 (diff) |
[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>
Diffstat (limited to 'drivers/char/watchdog/pc87413_wdt.c')
-rw-r--r-- | drivers/char/watchdog/pc87413_wdt.c | 610 |
1 files changed, 610 insertions, 0 deletions
diff --git a/drivers/char/watchdog/pc87413_wdt.c b/drivers/char/watchdog/pc87413_wdt.c new file mode 100644 index 000000000000..a6d42cf385e6 --- /dev/null +++ b/drivers/char/watchdog/pc87413_wdt.c @@ -0,0 +1,610 @@ +/* + * 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); + |