xref: /openbmc/linux/drivers/char/applicom.c (revision 22246614)
1 /* Derived from Applicom driver ac.c for SCO Unix                            */
2 /* Ported by David Woodhouse, Axiom (Cambridge) Ltd.                         */
3 /* dwmw2@infradead.org 30/8/98                                               */
4 /* $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $			     */
5 /* This module is for Linux 2.1 and 2.2 series kernels.                      */
6 /*****************************************************************************/
7 /* J PAGET 18/02/94 passage V2.4.2 ioctl avec code 2 reset to les interrupt  */
8 /* ceci pour reseter correctement apres une sortie sauvage                   */
9 /* J PAGET 02/05/94 passage V2.4.3 dans le traitement de d'interruption,     */
10 /* LoopCount n'etait pas initialise a 0.                                     */
11 /* F LAFORSE 04/07/95 version V2.6.0 lecture bidon apres acces a une carte   */
12 /*           pour liberer le bus                                             */
13 /* J.PAGET 19/11/95 version V2.6.1 Nombre, addresse,irq n'est plus configure */
14 /* et passe en argument a acinit, mais est scrute sur le bus pour s'adapter  */
15 /* au nombre de cartes presentes sur le bus. IOCL code 6 affichait V2.4.3    */
16 /* F.LAFORSE 28/11/95 creation de fichiers acXX.o avec les differentes       */
17 /* adresses de base des cartes, IOCTL 6 plus complet                         */
18 /* J.PAGET le 19/08/96 copie de la version V2.6 en V2.8.0 sans modification  */
19 /* de code autre que le texte V2.6.1 en V2.8.0                               */
20 /*****************************************************************************/
21 
22 
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/interrupt.h>
26 #include <linux/slab.h>
27 #include <linux/errno.h>
28 #include <linux/miscdevice.h>
29 #include <linux/pci.h>
30 #include <linux/wait.h>
31 #include <linux/init.h>
32 #include <linux/fs.h>
33 
34 #include <asm/io.h>
35 #include <asm/uaccess.h>
36 
37 #include "applicom.h"
38 
39 
40 /* NOTE: We use for loops with {write,read}b() instead of
41    memcpy_{from,to}io throughout this driver. This is because
42    the board doesn't correctly handle word accesses - only
43    bytes.
44 */
45 
46 
47 #undef DEBUG
48 
49 #define MAX_BOARD 8		/* maximum of pc board possible */
50 #define MAX_ISA_BOARD 4
51 #define LEN_RAM_IO 0x800
52 #define AC_MINOR 157
53 
54 #ifndef PCI_VENDOR_ID_APPLICOM
55 #define PCI_VENDOR_ID_APPLICOM                0x1389
56 #define PCI_DEVICE_ID_APPLICOM_PCIGENERIC     0x0001
57 #define PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN 0x0002
58 #define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
59 #endif
60 
61 static char *applicom_pci_devnames[] = {
62 	"PCI board",
63 	"PCI2000IBS / PCI2000CAN",
64 	"PCI2000PFB"
65 };
66 
67 static struct pci_device_id applicom_pci_tbl[] = {
68 	{ PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCIGENERIC) },
69 	{ PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN) },
70 	{ PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000PFB) },
71 	{ 0 }
72 };
73 MODULE_DEVICE_TABLE(pci, applicom_pci_tbl);
74 
75 MODULE_AUTHOR("David Woodhouse & Applicom International");
76 MODULE_DESCRIPTION("Driver for Applicom Profibus card");
77 MODULE_LICENSE("GPL");
78 
79 MODULE_SUPPORTED_DEVICE("ac");
80 
81 
82 static struct applicom_board {
83 	unsigned long PhysIO;
84 	void __iomem *RamIO;
85 	wait_queue_head_t FlagSleepSend;
86 	long irq;
87 	spinlock_t mutex;
88 } apbs[MAX_BOARD];
89 
90 static unsigned int irq = 0;	/* interrupt number IRQ       */
91 static unsigned long mem = 0;	/* physical segment of board  */
92 
93 module_param(irq, uint, 0);
94 MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
95 module_param(mem, ulong, 0);
96 MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");
97 
98 static unsigned int numboards;	/* number of installed boards */
99 static volatile unsigned char Dummy;
100 static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
101 static unsigned int WriteErrorCount;	/* number of write error      */
102 static unsigned int ReadErrorCount;	/* number of read error       */
103 static unsigned int DeviceErrorCount;	/* number of device error     */
104 
105 static ssize_t ac_read (struct file *, char __user *, size_t, loff_t *);
106 static ssize_t ac_write (struct file *, const char __user *, size_t, loff_t *);
107 static int ac_ioctl(struct inode *, struct file *, unsigned int,
108 		    unsigned long);
109 static irqreturn_t ac_interrupt(int, void *);
110 
111 static const struct file_operations ac_fops = {
112 	.owner = THIS_MODULE,
113 	.llseek = no_llseek,
114 	.read = ac_read,
115 	.write = ac_write,
116 	.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 			return -EIO;
201 
202 		RamIO = ioremap_nocache(pci_resource_start(dev, 0), LEN_RAM_IO);
203 
204 		if (!RamIO) {
205 			printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
206 				"space at 0x%llx\n",
207 				(unsigned long long)pci_resource_start(dev, 0));
208 			pci_disable_device(dev);
209 			return -EIO;
210 		}
211 
212 		printk(KERN_INFO "Applicom %s found at mem 0x%llx, irq %d\n",
213 		       applicom_pci_devnames[dev->device-1],
214 			   (unsigned long long)pci_resource_start(dev, 0),
215 		       dev->irq);
216 
217 		boardno = ac_register_board(pci_resource_start(dev, 0),
218 				RamIO, 0);
219 		if (!boardno) {
220 			printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.\n");
221 			iounmap(RamIO);
222 			pci_disable_device(dev);
223 			continue;
224 		}
225 
226 		if (request_irq(dev->irq, &ac_interrupt, IRQF_SHARED, "Applicom PCI", &dummy)) {
227 			printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.\n", dev->irq);
228 			iounmap(RamIO);
229 			pci_disable_device(dev);
230 			apbs[boardno - 1].RamIO = NULL;
231 			continue;
232 		}
233 
234 		/* Enable interrupts. */
235 
236 		writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);
237 
238 		apbs[boardno - 1].irq = dev->irq;
239 	}
240 
241 	/* Finished with PCI cards. If none registered,
242 	 * and there was no mem/irq specified, exit */
243 
244 	if (!mem || !irq) {
245 		if (numboards)
246 			goto fin;
247 		else {
248 			printk(KERN_INFO "ac.o: No PCI boards found.\n");
249 			printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.\n");
250 			return -ENXIO;
251 		}
252 	}
253 
254 	/* Now try the specified ISA cards */
255 
256 	for (i = 0; i < MAX_ISA_BOARD; i++) {
257 		RamIO = ioremap_nocache(mem + (LEN_RAM_IO * i), LEN_RAM_IO);
258 
259 		if (!RamIO) {
260 			printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)\n", i + 1);
261 			continue;
262 		}
263 
264 		if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
265 						  RamIO,i+1))) {
266 			iounmap(RamIO);
267 			continue;
268 		}
269 
270 		printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d\n", mem + (LEN_RAM_IO*i), irq);
271 
272 		if (!numisa) {
273 			if (request_irq(irq, &ac_interrupt, IRQF_SHARED, "Applicom ISA", &dummy)) {
274 				printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.\n", irq);
275 				iounmap(RamIO);
276 				apbs[boardno - 1].RamIO = NULL;
277 			}
278 			else
279 				apbs[boardno - 1].irq = irq;
280 		}
281 		else
282 			apbs[boardno - 1].irq = 0;
283 
284 		numisa++;
285 	}
286 
287 	if (!numisa)
288 		printk(KERN_WARNING "ac.o: No valid ISA Applicom boards found "
289 				"at mem 0x%lx\n", mem);
290 
291  fin:
292 	init_waitqueue_head(&FlagSleepRec);
293 
294 	WriteErrorCount = 0;
295 	ReadErrorCount = 0;
296 	DeviceErrorCount = 0;
297 
298 	if (numboards) {
299 		ret = misc_register(&ac_miscdev);
300 		if (ret) {
301 			printk(KERN_WARNING "ac.o: Unable to register misc device\n");
302 			goto out;
303 		}
304 		for (i = 0; i < MAX_BOARD; i++) {
305 			int serial;
306 			char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
307 
308 			if (!apbs[i].RamIO)
309 				continue;
310 
311 			for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
312 				boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
313 
314 			boardname[serial] = 0;
315 
316 
317 			printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
318 			       i+1, boardname,
319 			       (int)(readb(apbs[i].RamIO + VERS) >> 4),
320 			       (int)(readb(apbs[i].RamIO + VERS) & 0xF));
321 
322 			serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) +
323 				(readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) +
324 				(readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
325 
326 			if (serial != 0)
327 				printk(" S/N %d\n", serial);
328 			else
329 				printk("\n");
330 		}
331 		return 0;
332 	}
333 
334 	else
335 		return -ENXIO;
336 
337 out:
338 	for (i = 0; i < MAX_BOARD; i++) {
339 		if (!apbs[i].RamIO)
340 			continue;
341 		if (apbs[i].irq)
342 			free_irq(apbs[i].irq, &dummy);
343 		iounmap(apbs[i].RamIO);
344 	}
345 	pci_disable_device(dev);
346 	return ret;
347 }
348 
349 module_init(applicom_init);
350 module_exit(applicom_exit);
351 
352 
353 static ssize_t ac_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
354 {
355 	unsigned int NumCard;	/* Board number 1 -> 8           */
356 	unsigned int IndexCard;	/* Index board number 0 -> 7     */
357 	unsigned char TicCard;	/* Board TIC to send             */
358 	unsigned long flags;	/* Current priority              */
359 	struct st_ram_io st_loc;
360 	struct mailbox tmpmailbox;
361 #ifdef DEBUG
362 	int c;
363 #endif
364 	DECLARE_WAITQUEUE(wait, current);
365 
366 	if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
367 		static int warncount = 5;
368 		if (warncount) {
369 			printk(KERN_INFO "Hmmm. write() of Applicom card, length %zd != expected %zd\n",
370 			       count, sizeof(struct st_ram_io) + sizeof(struct mailbox));
371 			warncount--;
372 		}
373 		return -EINVAL;
374 	}
375 
376 	if(copy_from_user(&st_loc, buf, sizeof(struct st_ram_io)))
377 		return -EFAULT;
378 
379 	if(copy_from_user(&tmpmailbox, &buf[sizeof(struct st_ram_io)],
380 			  sizeof(struct mailbox)))
381 		return -EFAULT;
382 
383 	NumCard = st_loc.num_card;	/* board number to send          */
384 	TicCard = st_loc.tic_des_from_pc;	/* tic number to send            */
385 	IndexCard = NumCard - 1;
386 
387 	if((NumCard < 1) || (NumCard > MAX_BOARD) || !apbs[IndexCard].RamIO)
388 		return -EINVAL;
389 
390 #ifdef DEBUG
391 	printk("Write to applicom card #%d. struct st_ram_io follows:",
392 	       IndexCard+1);
393 
394 		for (c = 0; c < sizeof(struct st_ram_io);) {
395 
396 			printk("\n%5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);
397 
398 			for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
399 				printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
400 			}
401 		}
402 
403 		printk("\nstruct mailbox follows:");
404 
405 		for (c = 0; c < sizeof(struct mailbox);) {
406 			printk("\n%5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);
407 
408 			for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
409 				printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
410 			}
411 		}
412 
413 		printk("\n");
414 #endif
415 
416 	spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
417 
418 	/* Test octet ready correct */
419 	if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) {
420 		Dummy = readb(apbs[IndexCard].RamIO + VERS);
421 		spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
422 		printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d\n",
423 		       IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
424 		DeviceErrorCount++;
425 		return -EIO;
426 	}
427 
428 	/* Place ourselves on the wait queue */
429 	set_current_state(TASK_INTERRUPTIBLE);
430 	add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
431 
432 	/* Check whether the card is ready for us */
433 	while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
434 		Dummy = readb(apbs[IndexCard].RamIO + VERS);
435 		/* It's busy. Sleep. */
436 
437 		spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
438 		schedule();
439 		if (signal_pending(current)) {
440 			remove_wait_queue(&apbs[IndexCard].FlagSleepSend,
441 					  &wait);
442 			return -EINTR;
443 		}
444 		spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
445 		set_current_state(TASK_INTERRUPTIBLE);
446 	}
447 
448 	/* We may not have actually slept */
449 	set_current_state(TASK_RUNNING);
450 	remove_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
451 
452 	writeb(1, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
453 
454 	/* Which is best - lock down the pages with rawio and then
455 	   copy directly, or use bounce buffers? For now we do the latter
456 	   because it works with 2.2 still */
457 	{
458 		unsigned char *from = (unsigned char *) &tmpmailbox;
459 		void __iomem *to = apbs[IndexCard].RamIO + RAM_FROM_PC;
460 		int c;
461 
462 		for (c = 0; c < sizeof(struct mailbox); c++)
463 			writeb(*(from++), to++);
464 	}
465 
466 	writeb(0x20, apbs[IndexCard].RamIO + TIC_OWNER_FROM_PC);
467 	writeb(0xff, apbs[IndexCard].RamIO + NUMCARD_OWNER_FROM_PC);
468 	writeb(TicCard, apbs[IndexCard].RamIO + TIC_DES_FROM_PC);
469 	writeb(NumCard, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
470 	writeb(2, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
471 	writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
472 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
473 	spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
474 	return 0;
475 }
476 
477 static int do_ac_read(int IndexCard, char __user *buf,
478 		struct st_ram_io *st_loc, struct mailbox *mailbox)
479 {
480 	void __iomem *from = apbs[IndexCard].RamIO + RAM_TO_PC;
481 	unsigned char *to = (unsigned char *)&mailbox;
482 #ifdef DEBUG
483 	int c;
484 #endif
485 
486 	st_loc->tic_owner_to_pc = readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC);
487 	st_loc->numcard_owner_to_pc = readb(apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
488 
489 
490 	{
491 		int c;
492 
493 		for (c = 0; c < sizeof(struct mailbox); c++)
494 			*(to++) = readb(from++);
495 	}
496 	writeb(1, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
497 	writeb(1, apbs[IndexCard].RamIO + TYP_ACK_FROM_PC);
498 	writeb(IndexCard+1, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
499 	writeb(readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC),
500 	       apbs[IndexCard].RamIO + TIC_ACK_FROM_PC);
501 	writeb(2, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
502 	writeb(0, apbs[IndexCard].RamIO + DATA_TO_PC_READY);
503 	writeb(2, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
504 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
505 
506 #ifdef DEBUG
507 		printk("Read from applicom card #%d. struct st_ram_io follows:", NumCard);
508 
509 		for (c = 0; c < sizeof(struct st_ram_io);) {
510 			printk("\n%5.5X: %2.2X", c, ((unsigned char *)st_loc)[c]);
511 
512 			for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
513 				printk(" %2.2X", ((unsigned char *)st_loc)[c]);
514 			}
515 		}
516 
517 		printk("\nstruct mailbox follows:");
518 
519 		for (c = 0; c < sizeof(struct mailbox);) {
520 			printk("\n%5.5X: %2.2X", c, ((unsigned char *)mailbox)[c]);
521 
522 			for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
523 				printk(" %2.2X", ((unsigned char *)mailbox)[c]);
524 			}
525 		}
526 		printk("\n");
527 #endif
528 	return (sizeof(struct st_ram_io) + sizeof(struct mailbox));
529 }
530 
531 static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_t *ptr)
532 {
533 	unsigned long flags;
534 	unsigned int i;
535 	unsigned char tmp;
536 	int ret = 0;
537 	DECLARE_WAITQUEUE(wait, current);
538 #ifdef DEBUG
539 	int loopcount=0;
540 #endif
541 	/* No need to ratelimit this. Only root can trigger it anyway */
542 	if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
543 		printk( KERN_WARNING "Hmmm. read() of Applicom card, length %zd != expected %zd\n",
544 			count,sizeof(struct st_ram_io) + sizeof(struct mailbox));
545 		return -EINVAL;
546 	}
547 
548 	while(1) {
549 		/* Stick ourself on the wait queue */
550 		set_current_state(TASK_INTERRUPTIBLE);
551 		add_wait_queue(&FlagSleepRec, &wait);
552 
553 		/* Scan each board, looking for one which has a packet for us */
554 		for (i=0; i < MAX_BOARD; i++) {
555 			if (!apbs[i].RamIO)
556 				continue;
557 			spin_lock_irqsave(&apbs[i].mutex, flags);
558 
559 			tmp = readb(apbs[i].RamIO + DATA_TO_PC_READY);
560 
561 			if (tmp == 2) {
562 				struct st_ram_io st_loc;
563 				struct mailbox mailbox;
564 
565 				/* Got a packet for us */
566 				ret = do_ac_read(i, buf, &st_loc, &mailbox);
567 				spin_unlock_irqrestore(&apbs[i].mutex, flags);
568 				set_current_state(TASK_RUNNING);
569 				remove_wait_queue(&FlagSleepRec, &wait);
570 
571 				if (copy_to_user(buf, &st_loc, sizeof(st_loc)))
572 					return -EFAULT;
573 				if (copy_to_user(buf + sizeof(st_loc), &mailbox, sizeof(mailbox)))
574 					return -EFAULT;
575 				return tmp;
576 			}
577 
578 			if (tmp > 2) {
579 				/* Got an error */
580 				Dummy = readb(apbs[i].RamIO + VERS);
581 
582 				spin_unlock_irqrestore(&apbs[i].mutex, flags);
583 				set_current_state(TASK_RUNNING);
584 				remove_wait_queue(&FlagSleepRec, &wait);
585 
586 				printk(KERN_WARNING "APPLICOM driver read error board %d, DataToPcReady = %d\n",
587 				       i,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
588 				DeviceErrorCount++;
589 				return -EIO;
590 			}
591 
592 			/* Nothing for us. Try the next board */
593 			Dummy = readb(apbs[i].RamIO + VERS);
594 			spin_unlock_irqrestore(&apbs[i].mutex, flags);
595 
596 		} /* per board */
597 
598 		/* OK - No boards had data for us. Sleep now */
599 
600 		schedule();
601 		remove_wait_queue(&FlagSleepRec, &wait);
602 
603 		if (signal_pending(current))
604 			return -EINTR;
605 
606 #ifdef DEBUG
607 		if (loopcount++ > 2) {
608 			printk(KERN_DEBUG "Looping in ac_read. loopcount %d\n", loopcount);
609 		}
610 #endif
611 	}
612 }
613 
614 static irqreturn_t ac_interrupt(int vec, void *dev_instance)
615 {
616 	unsigned int i;
617 	unsigned int FlagInt;
618 	unsigned int LoopCount;
619 	int handled = 0;
620 
621 	//    printk("Applicom interrupt on IRQ %d occurred\n", vec);
622 
623 	LoopCount = 0;
624 
625 	do {
626 		FlagInt = 0;
627 		for (i = 0; i < MAX_BOARD; i++) {
628 
629 			/* Skip if this board doesn't exist */
630 			if (!apbs[i].RamIO)
631 				continue;
632 
633 			spin_lock(&apbs[i].mutex);
634 
635 			/* Skip if this board doesn't want attention */
636 			if(readb(apbs[i].RamIO + RAM_IT_TO_PC) == 0) {
637 				spin_unlock(&apbs[i].mutex);
638 				continue;
639 			}
640 
641 			handled = 1;
642 			FlagInt = 1;
643 			writeb(0, apbs[i].RamIO + RAM_IT_TO_PC);
644 
645 			if (readb(apbs[i].RamIO + DATA_TO_PC_READY) > 2) {
646 				printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataToPcReady = %d\n",
647 				       i+1,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
648 				DeviceErrorCount++;
649 			}
650 
651 			if((readb(apbs[i].RamIO + DATA_FROM_PC_READY) > 2) &&
652 			   (readb(apbs[i].RamIO + DATA_FROM_PC_READY) != 6)) {
653 
654 				printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataFromPcReady = %d\n",
655 				       i+1,(int)readb(apbs[i].RamIO + DATA_FROM_PC_READY));
656 				DeviceErrorCount++;
657 			}
658 
659 			if (readb(apbs[i].RamIO + DATA_TO_PC_READY) == 2) {	/* mailbox sent by the card ?   */
660 				if (waitqueue_active(&FlagSleepRec)) {
661 				wake_up_interruptible(&FlagSleepRec);
662 			}
663 			}
664 
665 			if (readb(apbs[i].RamIO + DATA_FROM_PC_READY) == 0) {	/* ram i/o free for write by pc ? */
666 				if (waitqueue_active(&apbs[i].FlagSleepSend)) {	/* process sleep during read ?    */
667 					wake_up_interruptible(&apbs[i].FlagSleepSend);
668 				}
669 			}
670 			Dummy = readb(apbs[i].RamIO + VERS);
671 
672 			if(readb(apbs[i].RamIO + RAM_IT_TO_PC)) {
673 				/* There's another int waiting on this card */
674 				spin_unlock(&apbs[i].mutex);
675 				i--;
676 			} else {
677 				spin_unlock(&apbs[i].mutex);
678 			}
679 		}
680 		if (FlagInt)
681 			LoopCount = 0;
682 		else
683 			LoopCount++;
684 	} while(LoopCount < 2);
685 	return IRQ_RETVAL(handled);
686 }
687 
688 
689 
690 static int ac_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
691 
692 {				/* @ ADG ou ATO selon le cas */
693 	int i;
694 	unsigned char IndexCard;
695 	void __iomem *pmem;
696 	int ret = 0;
697 	volatile unsigned char byte_reset_it;
698 	struct st_ram_io *adgl;
699 	void __user *argp = (void __user *)arg;
700 
701 	/* In general, the device is only openable by root anyway, so we're not
702 	   particularly concerned that bogus ioctls can flood the console. */
703 
704 	adgl = kmalloc(sizeof(struct st_ram_io), GFP_KERNEL);
705 	if (!adgl)
706 		return -ENOMEM;
707 
708 	if (copy_from_user(adgl, argp, sizeof(struct st_ram_io))) {
709 		kfree(adgl);
710 		return -EFAULT;
711 	}
712 
713 	IndexCard = adgl->num_card-1;
714 
715 	if(cmd != 0 && cmd != 6 &&
716 	   ((IndexCard >= MAX_BOARD) || !apbs[IndexCard].RamIO)) {
717 		static int warncount = 10;
718 		if (warncount) {
719 			printk( KERN_WARNING "APPLICOM driver IOCTL, bad board number %d\n",(int)IndexCard+1);
720 			warncount--;
721 		}
722 		kfree(adgl);
723 		return -EINVAL;
724 	}
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[IndexCard].RamIO + VERS) >> 4),
808 			       (int)(readb(apbs[IndexCard].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 		printk(KERN_INFO "APPLICOM driver ioctl, unknown function code %d\n",cmd) ;
836 		ret = -EINVAL;
837 		break;
838 	}
839 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
840 	kfree(adgl);
841 	return 0;
842 }
843 
844