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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [char/] [wdt.c] - Blame information for rev 1626

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1 1626 jcastillo 
/*
2 
 *      Industrial Computer Source WDT500/501 driver for Linux 1.3.x
3 
 *
4 
 *      (c) Copyright 1995      CymruNET Ltd
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 *                              Innovation Centre
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 *                              Singleton Park
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 *                              Swansea
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 *                              Wales
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 *                              UK
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 *                              SA2 8PP
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 *
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 *      http://www.cymru.net
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 *
14 
 *      This driver is provided under the GNU public license, incorporated
15 
 *      herein by reference. The driver is provided without warranty or
16 
 *      support.
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 *
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 *      Release 0.05.
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 *
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 *      Some changes by Dave Gregorich to fix modularisation and minor bugs.
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 */
22 
 
23 
#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/miscdevice.h>
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#include "wd501p.h"
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#include <linux/malloc.h>
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#include <linux/ioport.h>
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#include <linux/fcntl.h>
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#include <asm/io.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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static int wdt_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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 */
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static int io=0x240;
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static int irq=14;
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#define WD_TIMO (100*60)                /* 1 minute */
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/*
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 *      Programming support
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 */
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static void wdt_ctr_mode(int ctr, int mode)
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{
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        ctr<<=6;
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        ctr|=0x30;
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        ctr|=(mode<<1);
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        outb_p(ctr, WDT_CR);
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}
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62 
static void wdt_ctr_load(int ctr, int val)
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{
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        outb_p(val&0xFF, WDT_COUNT0+ctr);
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        outb_p(val>>8, WDT_COUNT0+ctr);
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}
67 
 
68 
/*
69 
 *      Kernel methods.
70 
 */
71 
 
72 
static void wdt_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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        /*
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         *      Read the status register see what is up and
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         *      then printk it.
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         */
78 
 
79 
        unsigned char status=inb_p(WDT_SR);
80 
 
81 
        status|=FEATUREMAP1;
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        status&=~FEATUREMAP2;
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84 
        printk(KERN_CRIT "WDT status %d\n", status);
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        if(!(status&WDC_SR_TGOOD))
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                printk(KERN_CRIT "Overheat alarm.(%d)\n",inb_p(WDT_RT));
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        if(!(status&WDC_SR_PSUOVER))
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                printk(KERN_CRIT "PSU over voltage.\n");
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        if(!(status&WDC_SR_PSUUNDR))
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                printk(KERN_CRIT "PSU under voltage.\n");
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        if(!(status&WDC_SR_FANGOOD))
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                printk(KERN_CRIT "Possible fan fault.\n");
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        if(!(status&WDC_SR_WCCR))
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#ifdef SOFTWARE_REBOOT
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#ifdef ONLY_TESTING
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                printk(KERN_CRIT "Would Reboot.\n");
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#else
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                printk(KERN_CRIT "Initiating system reboot.\n");
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                hard_reset_now();
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#endif
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#else
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                printk(KERN_CRIT "Reset in 5ms.\n");
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#endif
105 
}
106 
 
107 
 
108 
static int wdt_lseek(struct inode *inode, struct file *file, off_t offset,
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        int origin)
110 
{
111 
        return -ESPIPE;
112 
}
113 
 
114 
static int wdt_write(struct inode *inode, struct file *file, const char *buf, int count)
115 
{
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        /* Write a watchdog value */
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        inb_p(WDT_DC);
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        wdt_ctr_mode(1,2);
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        wdt_ctr_load(1,WD_TIMO);                /* Timeout */
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        outb_p(0, WDT_DC);
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        return count;
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}
123 
 
124 
/*
125 
 *      Read reports the temperature in farenheit
126 
 */
127 
 
128 
static int wdt_read(struct inode *inode, struct file *file, char *buf, int count)
129 
{
130 
        unsigned short c=inb_p(WDT_RT);
131 
        unsigned char cp;
132 
        int err;
133 
 
134 
        switch(MINOR(inode->i_rdev))
135 
        {
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                case TEMP_MINOR:
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                        err=verify_area(VERIFY_WRITE, buf, 1);
138 
                        if(err)
139 
                                return err;
140 
                        c*=11;
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                        c/=15;
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                        cp=c+7;
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                        memcpy_tofs(buf,&cp,1);
144 
                        return 1;
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                default:
146 
                        return -EINVAL;
147 
        }
148 
}
149 
 
150 
static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
151 
        unsigned long arg)
152 
{
153 
        return -EINVAL;
154 
}
155 
 
156 
static int wdt_open(struct inode *inode, struct file *file)
157 
{
158 
        switch(MINOR(inode->i_rdev))
159 
        {
160 
                case WATCHDOG_MINOR:
161 
                        if(wdt_is_open)
162 
                                return -EBUSY;
163 
                        MOD_INC_USE_COUNT;
164 
                        /*
165 
                         *      Activate
166 
                         */
167 
 
168 
                        wdt_is_open=1;
169 
                        inb_p(WDT_DC);          /* Disable */
170 
                        wdt_ctr_mode(0,3);
171 
                        wdt_ctr_mode(1,2);
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                        wdt_ctr_mode(2,0);
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                        wdt_ctr_load(0, 8948);           /* count at 100Hz */
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                        wdt_ctr_load(1,WD_TIMO);        /* Timeout 120 seconds */
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                        wdt_ctr_load(2,65535);
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                        outb_p(0, WDT_DC);       /* Enable */
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                        return 0;
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                case TEMP_MINOR:
179 
                        MOD_INC_USE_COUNT;
180 
                        return 0;
181 
                default:
182 
                        return -ENODEV;
183 
        }
184 
}
185 
 
186 
static void wdt_release(struct inode *inode, struct file *file)
187 
{
188 
        if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
189 
        {
190 
#ifndef CONFIG_WATCHDOG_NOWAYOUT
191 
                inb_p(WDT_DC);          /* Disable counters */
192 
                wdt_ctr_load(2,0);       /* 0 length reset pulses now */
193 
#endif
194 
                wdt_is_open=0;
195 
        }
196 
        MOD_DEC_USE_COUNT;
197 
}
198 
 
199 
/*
200 
 *      Kernel Interfaces
201 
 */
202 
 
203 
 
204 
static struct file_operations wdt_fops = {
205 
        wdt_lseek,
206 
        wdt_read,
207 
        wdt_write,
208 
        NULL,           /* No Readdir */
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        NULL,           /* No Select */
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        wdt_ioctl,
211 
        NULL,           /* No mmap */
212 
        wdt_open,
213 
        wdt_release
214 
};
215 
 
216 
static struct miscdevice wdt_miscdev=
217 
{
218 
        WATCHDOG_MINOR,
219 
        "wdt",
220 
        &wdt_fops
221 
};
222 
 
223 
#ifdef CONFIG_WDT_501
224 
static struct miscdevice temp_miscdev=
225 
{
226 
        TEMP_MINOR,
227 
        "temperature",
228 
        &wdt_fops
229 
};
230 
#endif
231 
 
232 
#ifdef MODULE
233 
 
234 
int init_module(void)
235 
{
236 
        printk("WDT501-P module at %X(Interrupt %d)\n", io,irq);
237 
        if(request_irq(irq, wdt_interrupt, SA_INTERRUPT, "wdt501p", NULL))
238 
        {
239 
                printk("IRQ %d is not free.\n", irq);
240 
                return -EIO;
241 
        }
242 
        misc_register(&wdt_miscdev);
243 
#ifdef CONFIG_WDT_501
244 
        misc_register(&temp_miscdev);
245 
#endif
246 
        request_region(io, 8, "wdt501");
247 
        return 0;
248 
}
249 
 
250 
void cleanup_module(void)
251 
{
252 
        misc_deregister(&wdt_miscdev);
253 
#ifdef CONFIG_WDT_501
254 
        misc_deregister(&temp_miscdev);
255 
#endif
256 
        release_region(io,8);
257 
        free_irq(irq, NULL);
258 
}
259 
 
260 
#else
261 
 
262 
int wdt_init(void)
263 
{
264 
        printk("WDT500/501-P driver at %X(Interrupt %d)\n", io,irq);
265 
        if(request_irq(irq, wdt_interrupt, SA_INTERRUPT, "wdt501p", NULL))
266 
        {
267 
                printk("IRQ %d is not free.\n", irq);
268 
                return -EIO;
269 
        }
270 
        misc_register(&wdt_miscdev);
271 
#ifdef CONFIG_WDT_501
272 
        misc_register(&temp_miscdev);
273 
#endif
274 
        request_region(io, 8, "wdt501");
275 
        return 0;
276 
}
277 
 
278 
#endif

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