summaryrefslogtreecommitdiffstats
path: root/target/linux/linux-2.4/patches/soekris/002-wd1100.patch
blob: 8cb2dbd04b66326bdc2ea5c8cd36c2cb93256d20 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
diff -Nur linux-2.4.29/drivers/char/Config.in linux-2.4.29_geode/drivers/char/Config.in
--- linux-2.4.29/drivers/char/Config.in	Sun Aug  8 01:26:04 2004
+++ linux-2.4.29_geode/drivers/char/Config.in	Tue Feb 15 23:41:54 2005
@@ -270,6 +270,7 @@
       fi
    fi
    tristate '  ZF MachZ Watchdog' CONFIG_MACHZ_WDT
+   tristate '  Embedded NatSemi SC1x00 Watchdog' CONFIG_WD1100
    if [ "$CONFIG_SGI_IP22" = "y" ]; then
       dep_tristate '  Indy/I2 Hardware Watchdog' CONFIG_INDYDOG $CONFIG_SGI_IP22
    fi
diff -Nur linux-2.4.29/drivers/char/Makefile linux-2.4.29_geode/drivers/char/Makefile
--- linux-2.4.29/drivers/char/Makefile	Sun Aug  8 01:26:04 2004
+++ linux-2.4.29_geode/drivers/char/Makefile	Tue Feb 15 23:41:54 2005
@@ -302,6 +302,7 @@
 obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
 obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o
 obj-$(CONFIG_IB700_WDT) += ib700wdt.o
+obj-$(CONFIG_WD1100) += wd1100.o
 obj-$(CONFIG_MIXCOMWD) += mixcomwd.o
 obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o
 obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o
diff -Nur linux-2.4.29/drivers/char/wd1100.c linux-2.4.29_geode/drivers/char/wd1100.c
--- linux-2.4.29/drivers/char/wd1100.c	Thu Jan  1 01:00:00 1970
+++ linux-2.4.29_geode/drivers/char/wd1100.c	Tue Feb 15 23:41:54 2005
@@ -0,0 +1,391 @@
+/*
+ *   National Semiconductor SC1x00 CPU watchdog driver
+ *   Copyright (c) Inprimis Technologies 2002
+ *
+ *   by Mark Grosberg <markg@inprimis.com>
+ *   and Rolando Goldman <rolandog@inprimis.com>
+ *
+ *   Minor changes by Kianusch Sayah Karadji <kianusch@sk-tech.net>
+ *   ( Soekris net4801 Support, module-parameter )
+ *
+ *   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.
+ *   
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/spinlock.h>
+#include <linux/sysctl.h>
+#include <linux/pci.h>
+
+/* 
+ * Since the SC1100 is an x86 clone, we don't even bother with 
+ * allowing other architectures to compile us.
+ */
+#ifndef CONFIG_X86
+# error Sorry this driver is only for x86.
+#endif
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/processor.h>
+
+/* #define DEBUG_WD1100 */
+
+static int proc_wd_timeout(ctl_table   *ctl, 
+                           int          write,
+                           struct file *file,
+                           void        *buffer,
+                           size_t      *lenp);
+static int proc_wd_graceful(ctl_table   *ctl, 
+                            int          write,
+                            struct file *file,
+                            void        *buffer,
+                            size_t      *lenp);
+                           
+/* Register definitions */
+
+#define SC1100_F5_VENDOR_ID  0x100B
+#define SC1100_F5_DEVICE_ID  0x0515   
+
+#define CPU_WDTO_REG    0x00 /* watchdog time out, 16 bit register */
+#define CPU_WDCNFG_REG  0x02 /* watchdog config , 16 bit register */
+#define CPU_WDSTS_REG   0x04 /* watchdog status , 8 bit register */
+
+/* Default timeout: 4 seconds (changeable via sysctl) */
+static unsigned int    sysctl_wd_timeout  = 0;
+static unsigned int    sysctl_wd_graceful = 0;
+
+static unsigned int    timeout  = 4;
+static unsigned int    graceful = 1;
+
+MODULE_PARM (timeout,  "i");
+MODULE_PARM (graceful, "i");
+
+static int             in_use    = 0;
+static unsigned short  cpu_base;
+static spinlock_t      wd_lock;
+
+/**************************************************************************/
+
+/* XXX To-do: DEV_WATCHDOG must be in include/linux/sysctl.h */
+enum
+{ DEV_WATCHDOG = 6 };
+
+enum
+{
+   DEV_WD_TIMEOUT   = 1,
+   DEV_WD_GRACEFUL  = 2
+};
+
+static struct ctl_table_header *wd_table_header;
+
+static ctl_table wd_table[] = {
+   {
+    DEV_WD_TIMEOUT, "timeout",
+    &sysctl_wd_timeout, sizeof(int), 0644, NULL, &proc_wd_timeout
+   },
+   
+   {
+    DEV_WD_GRACEFUL, "graceful",
+    &sysctl_wd_graceful, sizeof(int), 0644, NULL, &proc_wd_graceful
+   },
+
+   {0}
+};
+
+static ctl_table wd_dir_table[] = {
+   {DEV_WATCHDOG, "wd", NULL, 0, 0555, wd_table},
+   {0}
+};
+
+static ctl_table wd_root_table[] = {
+   {CTL_DEV, "dev", NULL, 0, 0555, wd_dir_table},
+   {0}
+};
+
+static int proc_wd_timeout(ctl_table   *ctl, 
+                           int          write,
+                           struct file *file,
+                           void        *buffer,
+                           size_t      *lenp)
+{
+  int   rc;
+  
+  rc = proc_dointvec(ctl, write, file, buffer, lenp);
+  if (write && (rc == 0))
+  {
+     /* Clamp to limits. */
+     if (sysctl_wd_timeout < 1) 
+       sysctl_wd_timeout = 1;
+     else if (sysctl_wd_timeout > 65535)
+       sysctl_wd_timeout = 65535;
+  }
+  
+  return (rc);
+}
+
+static int proc_wd_graceful(ctl_table   *ctl, 
+                            int          write,
+                            struct file *file,
+                            void        *buffer,
+                            size_t      *lenp)
+{
+  int   rc;
+  
+  rc = proc_dointvec(ctl, write, file, buffer, lenp);
+  if (write && (rc == 0))
+  {
+     /* Clamp to true/false. */
+     if (sysctl_wd_graceful) 
+       sysctl_wd_graceful = 1;
+  }
+  
+  return (rc);
+}                           
+
+/**************************************************************************/
+
+static __inline__ void reset_wd(void)
+{
+  outw(sysctl_wd_timeout * 8, cpu_base + CPU_WDTO_REG);
+}
+
+static int reboot_reason(void)
+{
+   static int    result;
+   static int    fetched = 0;
+ 
+   if (!fetched)
+   {
+     unsigned char sr;
+     
+     sr = inb(cpu_base + CPU_WDSTS_REG);
+     outb(sr | 1, cpu_base + CPU_WDSTS_REG);
+   
+     fetched = 1;
+   }
+   
+   return (result);
+}
+
+static struct watchdog_info wd_info =
+{
+   0,   /* Options          */
+   0,   /* Firmware version */
+   "NSC SC1x00 WD"
+};
+
+static int wd_ioctl(struct inode *inode, 
+                    struct file  *file, 
+                    unsigned int  cmd,
+                    unsigned long arg)
+{
+   int  i;
+   
+   switch (cmd)
+   {
+      default:
+        return (-ENOTTY);
+        
+      case WDIOC_GETSUPPORT:
+        i = verify_area(VERIFY_WRITE, (void *)arg, sizeof(struct watchdog_info));
+        if (i)
+          return (i);
+        else
+          return copy_to_user((struct watchdog_info *)arg, 
+                              &wd_info, 
+                              sizeof(wd_info));
+        break;
+        
+      case WDIOC_KEEPALIVE:
+        reset_wd();
+        return (0);
+        
+      case WDIOC_GETBOOTSTATUS:
+        i = reboot_reason();
+        return (put_user(i, (int *)arg));
+        
+      case WDIOC_GETSTATUS:
+        i = inw(cpu_base + CPU_WDTO_REG) / 8;
+        return (put_user(i, (int *)arg));
+   }       
+}                    
+
+static int wd_open(struct inode *inode, 
+                   struct file  *file)
+{
+  spin_lock(&wd_lock);
+  if (in_use)
+  {
+    spin_unlock(&wd_lock);
+    return (-EBUSY);
+  }
+  else
+    in_use++;
+    
+  spin_unlock(&wd_lock);
+
+  MOD_INC_USE_COUNT;
+
+  /*
+   * Configure the chip to do a reset if the timer goes to 0.
+   * Set the clock divisor to 4096.
+   */
+     
+  outw(0xfc, cpu_base + CPU_WDCNFG_REG);
+  
+  /* Start the watchdog: It won't run until we write the TO reg. */
+  reset_wd();
+
+  return (0);
+}
+
+static int wd_release(struct inode *inode,
+                       struct file  *file)
+{
+  spin_lock(&wd_lock);
+    
+  in_use = 0;
+  
+  /*
+   * If graceful shutdown is not set, then don't bother to stop the
+   * watchdog timer. This handles the scenario where the user process
+   * that is poking the watchdog gets terminated due to some error
+   * (say a SEGV or some VM condition). 
+   *
+   * In that case, the kernel would happily close the descriptor for
+   * us and leave us in a state where we aren't watching the dog...
+   *
+   * To work around this, the "graceful" sysctl prevents reset of the
+   * watchdog on close.
+   */
+  if (sysctl_wd_graceful)
+    outw(0, cpu_base + CPU_WDCNFG_REG);
+  
+  spin_unlock(&wd_lock);
+  MOD_DEC_USE_COUNT;
+  
+  return (0);
+}           
+
+static ssize_t wd_write(struct file *file,
+                        const char  *data,
+                        size_t       len,
+                        loff_t      *ppos)
+{
+  /* Device is non-seekable. */
+  if (ppos != &file->f_pos)
+    return (-ESPIPE);
+  
+  if (len > 0)
+    reset_wd();   
+  
+  return (len);
+}
+
+static struct file_operations wd_fops=
+{
+   owner:      THIS_MODULE,
+   write:      wd_write,
+   ioctl:      wd_ioctl,
+   open:       wd_open,
+   release:    wd_release,
+};
+ 
+static struct miscdevice sc1x00wd_miscdev=
+{
+   WATCHDOG_MINOR,
+   "watchdog",
+   &wd_fops
+};
+
+static int __init wd_init(void)
+{
+   int              ret;
+   struct pci_dev  *dev;
+   unsigned int     cw;
+
+   if (timeout < 1)
+      timeout = 1;
+   else if (timeout > 65535)
+      timeout = 65535;
+
+   if (graceful != 0)
+      graceful = 1;
+
+   sysctl_wd_timeout=timeout;
+   sysctl_wd_graceful=graceful;
+
+   if ((strcmp(boot_cpu_data.x86_vendor_id, "Geode by NSC") != 0)
+   ||  ((boot_cpu_data.x86_model  != 4) && boot_cpu_data.x86_model  != 9))
+   {
+      printk(KERN_WARNING "wd1100.c: This is not an SC1100 processor!\n");
+      return (0);
+   }
+
+   /* get the CONFIG BLOCK ADDRESS from scratch pad register */ 
+   dev = pci_find_device(SC1100_F5_VENDOR_ID,SC1100_F5_DEVICE_ID,0);
+   if (dev == NULL)
+   {
+     printk(KERN_ERR "wd1100.c: Can not find bridge device.\n");
+     return (0);
+   }
+
+   pci_read_config_dword(dev, 0x64, &cw);
+   cpu_base = (unsigned short )cw;
+  
+#ifdef DEBUG_WD1100
+   printk("wd1100.c: CPU base = 0x%X\n", (unsigned int )cpu_base);
+#endif
+
+   printk(KERN_INFO "SC1x00 Watchdog driver by Inprimis Technolgies.\n");
+   /*
+    * We must call reboot_reason() to reset the flag in the WD.
+    *
+    * Even though it is available as an ioctl(), we call it during
+    * module initialization to perform the clear. You can take out
+    * the printk(), but don't take out the call to reboot_reason().
+    */
+   if (reboot_reason())
+      printk(KERN_INFO "Last reboot was by watchdog!\n");
+    
+   spin_lock_init(&wd_lock);
+        
+   ret = misc_register(&sc1x00wd_miscdev);
+   if (ret)
+     printk(KERN_ERR "wd1100.c: Can't register device.\n");
+   else
+   {
+     wd_table_header = register_sysctl_table(wd_root_table, 1); 
+      if (wd_table_header == NULL)
+        printk(KERN_ERR "wd1100.c: Can't register sysctl.\n");
+   }
+
+   return 0;
+}   
+
+static void __exit wd_exit(void)
+{
+   if (wd_table_header != NULL)
+      unregister_sysctl_table(wd_table_header);
+   
+   misc_deregister(&sc1x00wd_miscdev);
+}
+
+EXPORT_NO_SYMBOLS; 
+
+module_init(wd_init);
+module_exit(wd_exit);
+
+MODULE_LICENSE("GPL");
+