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1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Derived from Applicom driver ac.c for SCO Unix                            */
3 /* Ported by David Woodhouse, Axiom (Cambridge) Ltd.                         */
4 /* [email protected] 30/8/98                                               */
5 /* $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $                          */
6 /* This module is for Linux 2.1 and 2.2 series kernels.                      */
7 /*****************************************************************************/
8 /* J PAGET 18/02/94 passage V2.4.2 ioctl avec code 2 reset to les interrupt  */
9 /* ceci pour reseter correctement apres une sortie sauvage                   */
10 /* J PAGET 02/05/94 passage V2.4.3 dans le traitement de d'interruption,     */
11 /* LoopCount n'etait pas initialise a 0.                                     */
12 /* F LAFORSE 04/07/95 version V2.6.0 lecture bidon apres acces a une carte   */
13 /*           pour liberer le bus                                             */
14 /* J.PAGET 19/11/95 version V2.6.1 Nombre, addresse,irq n'est plus configure */
15 /* et passe en argument a acinit, mais est scrute sur le bus pour s'adapter  */
16 /* au nombre de cartes presentes sur le bus. IOCL code 6 affichait V2.4.3    */
17 /* F.LAFORSE 28/11/95 creation de fichiers acXX.o avec les differentes       */
18 /* addresses de base des cartes, IOCTL 6 plus complet                         */
19 /* J.PAGET le 19/08/96 copie de la version V2.6 en V2.8.0 sans modification  */
20 /* de code autre que le texte V2.6.1 en V2.8.0                               */
21 /*****************************************************************************/
22
23
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/interrupt.h>
27 #include <linux/sched/signal.h>
28 #include <linux/slab.h>
29 #include <linux/errno.h>
30 #include <linux/mutex.h>
31 #include <linux/miscdevice.h>
32 #include <linux/pci.h>
33 #include <linux/wait.h>
34 #include <linux/init.h>
35 #include <linux/fs.h>
36 #include <linux/nospec.h>
37
38 #include <asm/io.h>
39 #include <linux/uaccess.h>
40
41 #include "applicom.h"
42
43
44 /* NOTE: We use for loops with {write,read}b() instead of 
45    memcpy_{from,to}io throughout this driver. This is because
46    the board doesn't correctly handle word accesses - only
47    bytes. 
48 */
49
50
51 #undef DEBUG
52
53 #define MAX_BOARD 8             /* maximum of pc board possible */
54 #define MAX_ISA_BOARD 4
55 #define LEN_RAM_IO 0x800
56
57 #ifndef PCI_VENDOR_ID_APPLICOM
58 #define PCI_VENDOR_ID_APPLICOM                0x1389
59 #define PCI_DEVICE_ID_APPLICOM_PCIGENERIC     0x0001
60 #define PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN 0x0002
61 #define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
62 #endif
63
64 static DEFINE_MUTEX(ac_mutex);
65 static char *applicom_pci_devnames[] = {
66         "PCI board",
67         "PCI2000IBS / PCI2000CAN",
68         "PCI2000PFB"
69 };
70
71 static const struct pci_device_id applicom_pci_tbl[] = {
72         { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCIGENERIC) },
73         { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN) },
74         { PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000PFB) },
75         { 0 }
76 };
77 MODULE_DEVICE_TABLE(pci, applicom_pci_tbl);
78
79 MODULE_AUTHOR("David Woodhouse & Applicom International");
80 MODULE_DESCRIPTION("Driver for Applicom Profibus card");
81 MODULE_LICENSE("GPL");
82 MODULE_ALIAS_MISCDEV(AC_MINOR);
83
84 static struct applicom_board {
85         unsigned long PhysIO;
86         void __iomem *RamIO;
87         wait_queue_head_t FlagSleepSend;
88         long irq;
89         spinlock_t mutex;
90 } apbs[MAX_BOARD];
91
92 static unsigned int irq;        /* interrupt number IRQ       */
93 static unsigned long mem;       /* physical segment of board  */
94
95 module_param_hw(irq, uint, irq, 0);
96 MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
97 module_param_hw(mem, ulong, iomem, 0);
98 MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");
99
100 static unsigned int numboards;  /* number of installed boards */
101 static volatile unsigned char Dummy;
102 static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
103 static unsigned int WriteErrorCount;    /* number of write error      */
104 static unsigned int ReadErrorCount;     /* number of read error       */
105 static unsigned int DeviceErrorCount;   /* number of device error     */
106
107 static ssize_t ac_read (struct file *, char __user *, size_t, loff_t *);
108 static ssize_t ac_write (struct file *, const char __user *, size_t, loff_t *);
109 static long ac_ioctl(struct file *, unsigned int, unsigned long);
110 static irqreturn_t ac_interrupt(int, void *);
111
112 static const struct file_operations ac_fops = {
113         .owner = THIS_MODULE,
114         .read = ac_read,
115         .write = ac_write,
116         .unlocked_ioctl = ac_ioctl,
117 };
118
119 static struct miscdevice ac_miscdev = {
120         AC_MINOR,
121         "ac",
122         &ac_fops
123 };
124
125 static int dummy;       /* dev_id for request_irq() */
126
127 static int ac_register_board(unsigned long physloc, void __iomem *loc, 
128                       unsigned char boardno)
129 {
130         volatile unsigned char byte_reset_it;
131
132         if((readb(loc + CONF_END_TEST)     != 0x00) ||
133            (readb(loc + CONF_END_TEST + 1) != 0x55) ||
134            (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
135            (readb(loc + CONF_END_TEST + 3) != 0xFF))
136                 return 0;
137
138         if (!boardno)
139                 boardno = readb(loc + NUMCARD_OWNER_TO_PC);
140
141         if (!boardno || boardno > MAX_BOARD) {
142                 printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).\n",
143                        boardno, physloc, MAX_BOARD);
144                 return 0;
145         }
146
147         if (apbs[boardno - 1].RamIO) {
148                 printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)\n", 
149                        boardno, physloc, boardno, apbs[boardno-1].PhysIO);
150                 return 0;
151         }
152
153         boardno--;
154
155         apbs[boardno].PhysIO = physloc;
156         apbs[boardno].RamIO = loc;
157         init_waitqueue_head(&apbs[boardno].FlagSleepSend);
158         spin_lock_init(&apbs[boardno].mutex);
159         byte_reset_it = readb(loc + RAM_IT_TO_PC);
160
161         numboards++;
162         return boardno + 1;
163 }
164
165 static void __exit applicom_exit(void)
166 {
167         unsigned int i;
168
169         misc_deregister(&ac_miscdev);
170
171         for (i = 0; i < MAX_BOARD; i++) {
172
173                 if (!apbs[i].RamIO)
174                         continue;
175
176                 if (apbs[i].irq)
177                         free_irq(apbs[i].irq, &dummy);
178
179                 iounmap(apbs[i].RamIO);
180         }
181 }
182
183 static int __init applicom_init(void)
184 {
185         int i, numisa = 0;
186         struct pci_dev *dev = NULL;
187         void __iomem *RamIO;
188         int boardno, ret;
189
190         printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");
191
192         /* No mem and irq given - check for a PCI card */
193
194         while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {
195
196                 if (!pci_match_id(applicom_pci_tbl, dev))
197                         continue;
198                 
199                 if (pci_enable_device(dev)) {
200                         pci_dev_put(dev);
201                         return -EIO;
202                 }
203
204                 RamIO = ioremap(pci_resource_start(dev, 0), LEN_RAM_IO);
205
206                 if (!RamIO) {
207                         printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
208                                 "space at 0x%llx\n",
209                                 (unsigned long long)pci_resource_start(dev, 0));
210                         pci_disable_device(dev);
211                         pci_dev_put(dev);
212                         return -EIO;
213                 }
214
215                 printk(KERN_INFO "Applicom %s found at mem 0x%llx, irq %d\n",
216                        applicom_pci_devnames[dev->device-1],
217                            (unsigned long long)pci_resource_start(dev, 0),
218                        dev->irq);
219
220                 boardno = ac_register_board(pci_resource_start(dev, 0),
221                                 RamIO, 0);
222                 if (!boardno) {
223                         printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.\n");
224                         iounmap(RamIO);
225                         pci_disable_device(dev);
226                         continue;
227                 }
228
229                 if (request_irq(dev->irq, &ac_interrupt, IRQF_SHARED, "Applicom PCI", &dummy)) {
230                         printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.\n", dev->irq);
231                         iounmap(RamIO);
232                         pci_disable_device(dev);
233                         apbs[boardno - 1].RamIO = NULL;
234                         continue;
235                 }
236
237                 /* Enable interrupts. */
238
239                 writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);
240
241                 apbs[boardno - 1].irq = dev->irq;
242         }
243
244         /* Finished with PCI cards. If none registered, 
245          * and there was no mem/irq specified, exit */
246
247         if (!mem || !irq) {
248                 if (numboards)
249                         goto fin;
250                 else {
251                         printk(KERN_INFO "ac.o: No PCI boards found.\n");
252                         printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.\n");
253                         return -ENXIO;
254                 }
255         }
256
257         /* Now try the specified ISA cards */
258
259         for (i = 0; i < MAX_ISA_BOARD; i++) {
260                 RamIO = ioremap(mem + (LEN_RAM_IO * i), LEN_RAM_IO);
261
262                 if (!RamIO) {
263                         printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)\n", i + 1);
264                         continue;
265                 }
266
267                 if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
268                                                   RamIO,i+1))) {
269                         iounmap(RamIO);
270                         continue;
271                 }
272
273                 printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d\n", mem + (LEN_RAM_IO*i), irq);
274
275                 if (!numisa) {
276                         if (request_irq(irq, &ac_interrupt, IRQF_SHARED, "Applicom ISA", &dummy)) {
277                                 printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.\n", irq);
278                                 iounmap(RamIO);
279                                 apbs[boardno - 1].RamIO = NULL;
280                         }
281                         else
282                                 apbs[boardno - 1].irq = irq;
283                 }
284                 else
285                         apbs[boardno - 1].irq = 0;
286
287                 numisa++;
288         }
289
290         if (!numisa)
291                 printk(KERN_WARNING "ac.o: No valid ISA Applicom boards found "
292                                 "at mem 0x%lx\n", mem);
293
294  fin:
295         init_waitqueue_head(&FlagSleepRec);
296
297         WriteErrorCount = 0;
298         ReadErrorCount = 0;
299         DeviceErrorCount = 0;
300
301         if (numboards) {
302                 ret = misc_register(&ac_miscdev);
303                 if (ret) {
304                         printk(KERN_WARNING "ac.o: Unable to register misc device\n");
305                         goto out;
306                 }
307                 for (i = 0; i < MAX_BOARD; i++) {
308                         int serial;
309                         char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
310
311                         if (!apbs[i].RamIO)
312                                 continue;
313
314                         for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
315                                 boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
316
317                         boardname[serial] = 0;
318
319
320                         printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
321                                i+1, boardname,
322                                (int)(readb(apbs[i].RamIO + VERS) >> 4),
323                                (int)(readb(apbs[i].RamIO + VERS) & 0xF));
324                         
325                         serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) + 
326                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) + 
327                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
328
329                         if (serial != 0)
330                                 printk(" S/N %d\n", serial);
331                         else
332                                 printk("\n");
333                 }
334                 return 0;
335         }
336
337         else
338                 return -ENXIO;
339
340 out:
341         for (i = 0; i < MAX_BOARD; i++) {
342                 if (!apbs[i].RamIO)
343                         continue;
344                 if (apbs[i].irq)
345                         free_irq(apbs[i].irq, &dummy);
346                 iounmap(apbs[i].RamIO);
347         }
348         return ret;
349 }
350
351 module_init(applicom_init);
352 module_exit(applicom_exit);
353
354
355 static ssize_t ac_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
356 {
357         unsigned int NumCard;   /* Board number 1 -> 8           */
358         unsigned int IndexCard; /* Index board number 0 -> 7     */
359         unsigned char TicCard;  /* Board TIC to send             */
360         unsigned long flags;    /* Current priority              */
361         struct st_ram_io st_loc;
362         struct mailbox tmpmailbox;
363 #ifdef DEBUG
364         int c;
365 #endif
366         DECLARE_WAITQUEUE(wait, current);
367
368         if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
369                 static int warncount = 5;
370                 if (warncount) {
371                         printk(KERN_INFO "Hmmm. write() of Applicom card, length %zd != expected %zd\n",
372                                count, sizeof(struct st_ram_io) + sizeof(struct mailbox));
373                         warncount--;
374                 }
375                 return -EINVAL;
376         }
377
378         if(copy_from_user(&st_loc, buf, sizeof(struct st_ram_io))) 
379                 return -EFAULT;
380         
381         if(copy_from_user(&tmpmailbox, &buf[sizeof(struct st_ram_io)],
382                           sizeof(struct mailbox))) 
383                 return -EFAULT;
384
385         NumCard = st_loc.num_card;      /* board number to send          */
386         TicCard = st_loc.tic_des_from_pc;       /* tic number to send            */
387         IndexCard = NumCard - 1;
388
389         if (IndexCard >= MAX_BOARD)
390                 return -EINVAL;
391         IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
392
393         if (!apbs[IndexCard].RamIO)
394                 return -EINVAL;
395
396 #ifdef DEBUG
397         printk("Write to applicom card #%d. struct st_ram_io follows:",
398                IndexCard+1);
399
400                 for (c = 0; c < sizeof(struct st_ram_io);) {
401                 
402                         printk("\n%5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);
403
404                         for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
405                                 printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
406                         }
407                 }
408
409                 printk("\nstruct mailbox follows:");
410
411                 for (c = 0; c < sizeof(struct mailbox);) {
412                         printk("\n%5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);
413
414                         for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
415                                 printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
416                         }
417                 }
418
419                 printk("\n");
420 #endif
421
422         spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
423
424         /* Test octet ready correct */
425         if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) { 
426                 Dummy = readb(apbs[IndexCard].RamIO + VERS);
427                 spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
428                 printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d\n",
429                        IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
430                 DeviceErrorCount++;
431                 return -EIO;
432         }
433         
434         /* Place ourselves on the wait queue */
435         set_current_state(TASK_INTERRUPTIBLE);
436         add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
437
438         /* Check whether the card is ready for us */
439         while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
440                 Dummy = readb(apbs[IndexCard].RamIO + VERS);
441                 /* It's busy. Sleep. */
442
443                 spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
444                 schedule();
445                 if (signal_pending(current)) {
446                         remove_wait_queue(&apbs[IndexCard].FlagSleepSend,
447                                           &wait);
448                         return -EINTR;
449                 }
450                 spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
451                 set_current_state(TASK_INTERRUPTIBLE);
452         }
453
454         /* We may not have actually slept */
455         set_current_state(TASK_RUNNING);
456         remove_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
457
458         writeb(1, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
459
460         /* Which is best - lock down the pages with rawio and then
461            copy directly, or use bounce buffers? For now we do the latter 
462            because it works with 2.2 still */
463         {
464                 unsigned char *from = (unsigned char *) &tmpmailbox;
465                 void __iomem *to = apbs[IndexCard].RamIO + RAM_FROM_PC;
466                 int c;
467
468                 for (c = 0; c < sizeof(struct mailbox); c++)
469                         writeb(*(from++), to++);
470         }
471
472         writeb(0x20, apbs[IndexCard].RamIO + TIC_OWNER_FROM_PC);
473         writeb(0xff, apbs[IndexCard].RamIO + NUMCARD_OWNER_FROM_PC);
474         writeb(TicCard, apbs[IndexCard].RamIO + TIC_DES_FROM_PC);
475         writeb(NumCard, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
476         writeb(2, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
477         writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
478         Dummy = readb(apbs[IndexCard].RamIO + VERS);
479         spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
480         return 0;
481 }
482
483 static int do_ac_read(int IndexCard, char __user *buf,
484                 struct st_ram_io *st_loc, struct mailbox *mailbox)
485 {
486         void __iomem *from = apbs[IndexCard].RamIO + RAM_TO_PC;
487         unsigned char *to = (unsigned char *)mailbox;
488 #ifdef DEBUG
489         int c;
490 #endif
491
492         st_loc->tic_owner_to_pc = readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC);
493         st_loc->numcard_owner_to_pc = readb(apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
494
495
496         {
497                 int c;
498
499                 for (c = 0; c < sizeof(struct mailbox); c++)
500                         *(to++) = readb(from++);
501         }
502         writeb(1, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
503         writeb(1, apbs[IndexCard].RamIO + TYP_ACK_FROM_PC);
504         writeb(IndexCard+1, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
505         writeb(readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC), 
506                apbs[IndexCard].RamIO + TIC_ACK_FROM_PC);
507         writeb(2, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
508         writeb(0, apbs[IndexCard].RamIO + DATA_TO_PC_READY);
509         writeb(2, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
510         Dummy = readb(apbs[IndexCard].RamIO + VERS);
511
512 #ifdef DEBUG
513                 printk("Read from applicom card #%d. struct st_ram_io follows:", NumCard);
514
515                 for (c = 0; c < sizeof(struct st_ram_io);) {
516                         printk("\n%5.5X: %2.2X", c, ((unsigned char *)st_loc)[c]);
517
518                         for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
519                                 printk(" %2.2X", ((unsigned char *)st_loc)[c]);
520                         }
521                 }
522
523                 printk("\nstruct mailbox follows:");
524
525                 for (c = 0; c < sizeof(struct mailbox);) {
526                         printk("\n%5.5X: %2.2X", c, ((unsigned char *)mailbox)[c]);
527
528                         for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
529                                 printk(" %2.2X", ((unsigned char *)mailbox)[c]);
530                         }
531                 }
532                 printk("\n");
533 #endif
534         return (sizeof(struct st_ram_io) + sizeof(struct mailbox));
535 }
536
537 static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_t *ptr)
538 {
539         unsigned long flags;
540         unsigned int i;
541         unsigned char tmp;
542         int ret = 0;
543         DECLARE_WAITQUEUE(wait, current);
544 #ifdef DEBUG
545         int loopcount=0;
546 #endif
547         /* No need to ratelimit this. Only root can trigger it anyway */
548         if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
549                 printk( KERN_WARNING "Hmmm. read() of Applicom card, length %zd != expected %zd\n",
550                         count,sizeof(struct st_ram_io) + sizeof(struct mailbox));
551                 return -EINVAL;
552         }
553         
554         while(1) {
555                 /* Stick ourself on the wait queue */
556                 set_current_state(TASK_INTERRUPTIBLE);
557                 add_wait_queue(&FlagSleepRec, &wait);
558                 
559                 /* Scan each board, looking for one which has a packet for us */
560                 for (i=0; i < MAX_BOARD; i++) {
561                         if (!apbs[i].RamIO)
562                                 continue;
563                         spin_lock_irqsave(&apbs[i].mutex, flags);
564                         
565                         tmp = readb(apbs[i].RamIO + DATA_TO_PC_READY);
566                         
567                         if (tmp == 2) {
568                                 struct st_ram_io st_loc;
569                                 struct mailbox mailbox;
570
571                                 /* Got a packet for us */
572                                 memset(&st_loc, 0, sizeof(st_loc));
573                                 ret = do_ac_read(i, buf, &st_loc, &mailbox);
574                                 spin_unlock_irqrestore(&apbs[i].mutex, flags);
575                                 set_current_state(TASK_RUNNING);
576                                 remove_wait_queue(&FlagSleepRec, &wait);
577
578                                 if (copy_to_user(buf, &st_loc, sizeof(st_loc)))
579                                         return -EFAULT;
580                                 if (copy_to_user(buf + sizeof(st_loc), &mailbox, sizeof(mailbox)))
581                                         return -EFAULT;
582                                 return tmp;
583                         }
584                         
585                         if (tmp > 2) {
586                                 /* Got an error */
587                                 Dummy = readb(apbs[i].RamIO + VERS);
588                                 
589                                 spin_unlock_irqrestore(&apbs[i].mutex, flags);
590                                 set_current_state(TASK_RUNNING);
591                                 remove_wait_queue(&FlagSleepRec, &wait);
592                                 
593                                 printk(KERN_WARNING "APPLICOM driver read error board %d, DataToPcReady = %d\n",
594                                        i,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
595                                 DeviceErrorCount++;
596                                 return -EIO;
597                         }
598                         
599                         /* Nothing for us. Try the next board */
600                         Dummy = readb(apbs[i].RamIO + VERS);
601                         spin_unlock_irqrestore(&apbs[i].mutex, flags);
602                         
603                 } /* per board */
604
605                 /* OK - No boards had data for us. Sleep now */
606
607                 schedule();
608                 remove_wait_queue(&FlagSleepRec, &wait);
609
610                 if (signal_pending(current))
611                         return -EINTR;
612
613 #ifdef DEBUG
614                 if (loopcount++ > 2) {
615                         printk(KERN_DEBUG "Looping in ac_read. loopcount %d\n", loopcount);
616                 }
617 #endif
618         } 
619 }
620
621 static irqreturn_t ac_interrupt(int vec, void *dev_instance)
622 {
623         unsigned int i;
624         unsigned int FlagInt;
625         unsigned int LoopCount;
626         int handled = 0;
627
628         //    printk("Applicom interrupt on IRQ %d occurred\n", vec);
629
630         LoopCount = 0;
631
632         do {
633                 FlagInt = 0;
634                 for (i = 0; i < MAX_BOARD; i++) {
635                         
636                         /* Skip if this board doesn't exist */
637                         if (!apbs[i].RamIO)
638                                 continue;
639
640                         spin_lock(&apbs[i].mutex);
641
642                         /* Skip if this board doesn't want attention */
643                         if(readb(apbs[i].RamIO + RAM_IT_TO_PC) == 0) {
644                                 spin_unlock(&apbs[i].mutex);
645                                 continue;
646                         }
647
648                         handled = 1;
649                         FlagInt = 1;
650                         writeb(0, apbs[i].RamIO + RAM_IT_TO_PC);
651
652                         if (readb(apbs[i].RamIO + DATA_TO_PC_READY) > 2) {
653                                 printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataToPcReady = %d\n",
654                                        i+1,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
655                                 DeviceErrorCount++;
656                         }
657
658                         if((readb(apbs[i].RamIO + DATA_FROM_PC_READY) > 2) && 
659                            (readb(apbs[i].RamIO + DATA_FROM_PC_READY) != 6)) {
660                                 
661                                 printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataFromPcReady = %d\n",
662                                        i+1,(int)readb(apbs[i].RamIO + DATA_FROM_PC_READY));
663                                 DeviceErrorCount++;
664                         }
665
666                         if (readb(apbs[i].RamIO + DATA_TO_PC_READY) == 2) {     /* mailbox sent by the card ?   */
667                                 if (waitqueue_active(&FlagSleepRec)) {
668                                 wake_up_interruptible(&FlagSleepRec);
669                         }
670                         }
671
672                         if (readb(apbs[i].RamIO + DATA_FROM_PC_READY) == 0) {   /* ram i/o free for write by pc ? */
673                                 if (waitqueue_active(&apbs[i].FlagSleepSend)) { /* process sleep during read ?    */
674                                         wake_up_interruptible(&apbs[i].FlagSleepSend);
675                                 }
676                         }
677                         Dummy = readb(apbs[i].RamIO + VERS);
678
679                         if(readb(apbs[i].RamIO + RAM_IT_TO_PC)) {
680                                 /* There's another int waiting on this card */
681                                 spin_unlock(&apbs[i].mutex);
682                                 i--;
683                         } else {
684                                 spin_unlock(&apbs[i].mutex);
685                         }
686                 }
687                 if (FlagInt)
688                         LoopCount = 0;
689                 else
690                         LoopCount++;
691         } while(LoopCount < 2);
692         return IRQ_RETVAL(handled);
693 }
694
695
696
697 static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
698      
699 {                               /* @ ADG ou ATO selon le cas */
700         int i;
701         unsigned char IndexCard;
702         void __iomem *pmem;
703         int ret = 0;
704         static int warncount = 10;
705         volatile unsigned char byte_reset_it;
706         struct st_ram_io *adgl;
707         void __user *argp = (void __user *)arg;
708
709         /* In general, the device is only openable by root anyway, so we're not
710            particularly concerned that bogus ioctls can flood the console. */
711
712         adgl = memdup_user(argp, sizeof(struct st_ram_io));
713         if (IS_ERR(adgl))
714                 return PTR_ERR(adgl);
715
716         mutex_lock(&ac_mutex);  
717         IndexCard = adgl->num_card-1;
718          
719         if (cmd != 6 && IndexCard >= MAX_BOARD)
720                 goto err;
721         IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
722
723         if (cmd != 6 && !apbs[IndexCard].RamIO)
724                 goto err;
725
726         switch (cmd) {
727                 
728         case 0:
729                 pmem = apbs[IndexCard].RamIO;
730                 for (i = 0; i < sizeof(struct st_ram_io); i++)
731                         ((unsigned char *)adgl)[i]=readb(pmem++);
732                 if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
733                         ret = -EFAULT;
734                 break;
735         case 1:
736                 pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
737                 for (i = 0; i < 4; i++)
738                         adgl->conf_end_test[i] = readb(pmem++);
739                 for (i = 0; i < 2; i++)
740                         adgl->error_code[i] = readb(pmem++);
741                 for (i = 0; i < 4; i++)
742                         adgl->parameter_error[i] = readb(pmem++);
743                 pmem = apbs[IndexCard].RamIO + VERS;
744                 adgl->vers = readb(pmem);
745                 pmem = apbs[IndexCard].RamIO + TYPE_CARD;
746                 for (i = 0; i < 20; i++)
747                         adgl->reserv1[i] = readb(pmem++);
748                 *(int *)&adgl->reserv1[20] =  
749                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER) << 16) + 
750                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 1) << 8) + 
751                         (readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 2) );
752
753                 if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
754                         ret = -EFAULT;
755                 break;
756         case 2:
757                 pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
758                 for (i = 0; i < 10; i++)
759                         writeb(0xff, pmem++);
760                 writeb(adgl->data_from_pc_ready, 
761                        apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
762
763                 writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
764                 
765                 for (i = 0; i < MAX_BOARD; i++) {
766                         if (apbs[i].RamIO) {
767                                 byte_reset_it = readb(apbs[i].RamIO + RAM_IT_TO_PC);
768                         }
769                 }
770                 break;
771         case 3:
772                 pmem = apbs[IndexCard].RamIO + TIC_DES_FROM_PC;
773                 writeb(adgl->tic_des_from_pc, pmem);
774                 break;
775         case 4:
776                 pmem = apbs[IndexCard].RamIO + TIC_OWNER_TO_PC;
777                 adgl->tic_owner_to_pc     = readb(pmem++);
778                 adgl->numcard_owner_to_pc = readb(pmem);
779                 if (copy_to_user(argp, adgl,sizeof(struct st_ram_io)))
780                         ret = -EFAULT;
781                 break;
782         case 5:
783                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
784                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
785                 writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
786                 writeb(4, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
787                 writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
788                 break;
789         case 6:
790                 printk(KERN_INFO "APPLICOM driver release .... V2.8.0 ($Revision: 1.30 $)\n");
791                 printk(KERN_INFO "Number of installed boards . %d\n", (int) numboards);
792                 printk(KERN_INFO "Segment of board ........... %X\n", (int) mem);
793                 printk(KERN_INFO "Interrupt IRQ number ....... %d\n", (int) irq);
794                 for (i = 0; i < MAX_BOARD; i++) {
795                         int serial;
796                         char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
797
798                         if (!apbs[i].RamIO)
799                                 continue;
800
801                         for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
802                                 boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
803                         boardname[serial] = 0;
804
805                         printk(KERN_INFO "Prom version board %d ....... V%d.%d %s",
806                                i+1,
807                                (int)(readb(apbs[i].RamIO + VERS) >> 4),
808                                (int)(readb(apbs[i].RamIO + VERS) & 0xF),
809                                boardname);
810
811
812                         serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) + 
813                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) + 
814                                 (readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
815
816                         if (serial != 0)
817                                 printk(" S/N %d\n", serial);
818                         else
819                                 printk("\n");
820                 }
821                 if (DeviceErrorCount != 0)
822                         printk(KERN_INFO "DeviceErrorCount ........... %d\n", DeviceErrorCount);
823                 if (ReadErrorCount != 0)
824                         printk(KERN_INFO "ReadErrorCount ............. %d\n", ReadErrorCount);
825                 if (WriteErrorCount != 0)
826                         printk(KERN_INFO "WriteErrorCount ............ %d\n", WriteErrorCount);
827                 if (waitqueue_active(&FlagSleepRec))
828                         printk(KERN_INFO "Process in read pending\n");
829                 for (i = 0; i < MAX_BOARD; i++) {
830                         if (apbs[i].RamIO && waitqueue_active(&apbs[i].FlagSleepSend))
831                                 printk(KERN_INFO "Process in write pending board %d\n",i+1);
832                 }
833                 break;
834         default:
835                 ret = -ENOTTY;
836                 break;
837         }
838         Dummy = readb(apbs[IndexCard].RamIO + VERS);
839         kfree(adgl);
840         mutex_unlock(&ac_mutex);
841         return ret;
842
843 err:
844         if (warncount) {
845                 pr_warn("APPLICOM driver IOCTL, bad board number %d\n",
846                         (int)IndexCard + 1);
847                 warncount--;
848         }
849         kfree(adgl);
850         mutex_unlock(&ac_mutex);
851         return -EINVAL;
852
853 }
854
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