xref: /openbmc/linux/drivers/char/applicom.c (revision d0b73b48)
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 /* addresses 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/sched.h>
27 #include <linux/slab.h>
28 #include <linux/errno.h>
29 #include <linux/mutex.h>
30 #include <linux/miscdevice.h>
31 #include <linux/pci.h>
32 #include <linux/wait.h>
33 #include <linux/init.h>
34 #include <linux/fs.h>
35 
36 #include <asm/io.h>
37 #include <asm/uaccess.h>
38 
39 #include "applicom.h"
40 
41 
42 /* NOTE: We use for loops with {write,read}b() instead of
43    memcpy_{from,to}io throughout this driver. This is because
44    the board doesn't correctly handle word accesses - only
45    bytes.
46 */
47 
48 
49 #undef DEBUG
50 
51 #define MAX_BOARD 8		/* maximum of pc board possible */
52 #define MAX_ISA_BOARD 4
53 #define LEN_RAM_IO 0x800
54 #define AC_MINOR 157
55 
56 #ifndef PCI_VENDOR_ID_APPLICOM
57 #define PCI_VENDOR_ID_APPLICOM                0x1389
58 #define PCI_DEVICE_ID_APPLICOM_PCIGENERIC     0x0001
59 #define PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN 0x0002
60 #define PCI_DEVICE_ID_APPLICOM_PCI2000PFB     0x0003
61 #endif
62 
63 static DEFINE_MUTEX(ac_mutex);
64 static char *applicom_pci_devnames[] = {
65 	"PCI board",
66 	"PCI2000IBS / PCI2000CAN",
67 	"PCI2000PFB"
68 };
69 
70 static struct pci_device_id applicom_pci_tbl[] = {
71 	{ PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCIGENERIC) },
72 	{ PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000IBS_CAN) },
73 	{ PCI_VDEVICE(APPLICOM, PCI_DEVICE_ID_APPLICOM_PCI2000PFB) },
74 	{ 0 }
75 };
76 MODULE_DEVICE_TABLE(pci, applicom_pci_tbl);
77 
78 MODULE_AUTHOR("David Woodhouse & Applicom International");
79 MODULE_DESCRIPTION("Driver for Applicom Profibus card");
80 MODULE_LICENSE("GPL");
81 MODULE_ALIAS_MISCDEV(AC_MINOR);
82 
83 MODULE_SUPPORTED_DEVICE("ac");
84 
85 
86 static struct applicom_board {
87 	unsigned long PhysIO;
88 	void __iomem *RamIO;
89 	wait_queue_head_t FlagSleepSend;
90 	long irq;
91 	spinlock_t mutex;
92 } apbs[MAX_BOARD];
93 
94 static unsigned int irq = 0;	/* interrupt number IRQ       */
95 static unsigned long mem = 0;	/* physical segment of board  */
96 
97 module_param(irq, uint, 0);
98 MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
99 module_param(mem, ulong, 0);
100 MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");
101 
102 static unsigned int numboards;	/* number of installed boards */
103 static volatile unsigned char Dummy;
104 static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
105 static unsigned int WriteErrorCount;	/* number of write error      */
106 static unsigned int ReadErrorCount;	/* number of read error       */
107 static unsigned int DeviceErrorCount;	/* number of device error     */
108 
109 static ssize_t ac_read (struct file *, char __user *, size_t, loff_t *);
110 static ssize_t ac_write (struct file *, const char __user *, size_t, loff_t *);
111 static long ac_ioctl(struct file *, unsigned int, unsigned long);
112 static irqreturn_t ac_interrupt(int, void *);
113 
114 static const struct file_operations ac_fops = {
115 	.owner = THIS_MODULE,
116 	.llseek = no_llseek,
117 	.read = ac_read,
118 	.write = ac_write,
119 	.unlocked_ioctl = ac_ioctl,
120 };
121 
122 static struct miscdevice ac_miscdev = {
123 	AC_MINOR,
124 	"ac",
125 	&ac_fops
126 };
127 
128 static int dummy;	/* dev_id for request_irq() */
129 
130 static int ac_register_board(unsigned long physloc, void __iomem *loc,
131 		      unsigned char boardno)
132 {
133 	volatile unsigned char byte_reset_it;
134 
135 	if((readb(loc + CONF_END_TEST)     != 0x00) ||
136 	   (readb(loc + CONF_END_TEST + 1) != 0x55) ||
137 	   (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
138 	   (readb(loc + CONF_END_TEST + 3) != 0xFF))
139 		return 0;
140 
141 	if (!boardno)
142 		boardno = readb(loc + NUMCARD_OWNER_TO_PC);
143 
144 	if (!boardno || boardno > MAX_BOARD) {
145 		printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).\n",
146 		       boardno, physloc, MAX_BOARD);
147 		return 0;
148 	}
149 
150 	if (apbs[boardno - 1].RamIO) {
151 		printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)\n",
152 		       boardno, physloc, boardno, apbs[boardno-1].PhysIO);
153 		return 0;
154 	}
155 
156 	boardno--;
157 
158 	apbs[boardno].PhysIO = physloc;
159 	apbs[boardno].RamIO = loc;
160 	init_waitqueue_head(&apbs[boardno].FlagSleepSend);
161 	spin_lock_init(&apbs[boardno].mutex);
162 	byte_reset_it = readb(loc + RAM_IT_TO_PC);
163 
164 	numboards++;
165 	return boardno + 1;
166 }
167 
168 static void __exit applicom_exit(void)
169 {
170 	unsigned int i;
171 
172 	misc_deregister(&ac_miscdev);
173 
174 	for (i = 0; i < MAX_BOARD; i++) {
175 
176 		if (!apbs[i].RamIO)
177 			continue;
178 
179 		if (apbs[i].irq)
180 			free_irq(apbs[i].irq, &dummy);
181 
182 		iounmap(apbs[i].RamIO);
183 	}
184 }
185 
186 static int __init applicom_init(void)
187 {
188 	int i, numisa = 0;
189 	struct pci_dev *dev = NULL;
190 	void __iomem *RamIO;
191 	int boardno, ret;
192 
193 	printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");
194 
195 	/* No mem and irq given - check for a PCI card */
196 
197 	while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {
198 
199 		if (!pci_match_id(applicom_pci_tbl, dev))
200 			continue;
201 
202 		if (pci_enable_device(dev))
203 			return -EIO;
204 
205 		RamIO = ioremap_nocache(pci_resource_start(dev, 0), LEN_RAM_IO);
206 
207 		if (!RamIO) {
208 			printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
209 				"space at 0x%llx\n",
210 				(unsigned long long)pci_resource_start(dev, 0));
211 			pci_disable_device(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_nocache(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 	pci_disable_device(dev);
349 	return ret;
350 }
351 
352 module_init(applicom_init);
353 module_exit(applicom_exit);
354 
355 
356 static ssize_t ac_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos)
357 {
358 	unsigned int NumCard;	/* Board number 1 -> 8           */
359 	unsigned int IndexCard;	/* Index board number 0 -> 7     */
360 	unsigned char TicCard;	/* Board TIC to send             */
361 	unsigned long flags;	/* Current priority              */
362 	struct st_ram_io st_loc;
363 	struct mailbox tmpmailbox;
364 #ifdef DEBUG
365 	int c;
366 #endif
367 	DECLARE_WAITQUEUE(wait, current);
368 
369 	if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
370 		static int warncount = 5;
371 		if (warncount) {
372 			printk(KERN_INFO "Hmmm. write() of Applicom card, length %zd != expected %zd\n",
373 			       count, sizeof(struct st_ram_io) + sizeof(struct mailbox));
374 			warncount--;
375 		}
376 		return -EINVAL;
377 	}
378 
379 	if(copy_from_user(&st_loc, buf, sizeof(struct st_ram_io)))
380 		return -EFAULT;
381 
382 	if(copy_from_user(&tmpmailbox, &buf[sizeof(struct st_ram_io)],
383 			  sizeof(struct mailbox)))
384 		return -EFAULT;
385 
386 	NumCard = st_loc.num_card;	/* board number to send          */
387 	TicCard = st_loc.tic_des_from_pc;	/* tic number to send            */
388 	IndexCard = NumCard - 1;
389 
390 	if((NumCard < 1) || (NumCard > MAX_BOARD) || !apbs[IndexCard].RamIO)
391 		return -EINVAL;
392 
393 #ifdef DEBUG
394 	printk("Write to applicom card #%d. struct st_ram_io follows:",
395 	       IndexCard+1);
396 
397 		for (c = 0; c < sizeof(struct st_ram_io);) {
398 
399 			printk("\n%5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);
400 
401 			for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
402 				printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
403 			}
404 		}
405 
406 		printk("\nstruct mailbox follows:");
407 
408 		for (c = 0; c < sizeof(struct mailbox);) {
409 			printk("\n%5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);
410 
411 			for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
412 				printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
413 			}
414 		}
415 
416 		printk("\n");
417 #endif
418 
419 	spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
420 
421 	/* Test octet ready correct */
422 	if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) {
423 		Dummy = readb(apbs[IndexCard].RamIO + VERS);
424 		spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
425 		printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d\n",
426 		       IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
427 		DeviceErrorCount++;
428 		return -EIO;
429 	}
430 
431 	/* Place ourselves on the wait queue */
432 	set_current_state(TASK_INTERRUPTIBLE);
433 	add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
434 
435 	/* Check whether the card is ready for us */
436 	while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
437 		Dummy = readb(apbs[IndexCard].RamIO + VERS);
438 		/* It's busy. Sleep. */
439 
440 		spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
441 		schedule();
442 		if (signal_pending(current)) {
443 			remove_wait_queue(&apbs[IndexCard].FlagSleepSend,
444 					  &wait);
445 			return -EINTR;
446 		}
447 		spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
448 		set_current_state(TASK_INTERRUPTIBLE);
449 	}
450 
451 	/* We may not have actually slept */
452 	set_current_state(TASK_RUNNING);
453 	remove_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
454 
455 	writeb(1, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
456 
457 	/* Which is best - lock down the pages with rawio and then
458 	   copy directly, or use bounce buffers? For now we do the latter
459 	   because it works with 2.2 still */
460 	{
461 		unsigned char *from = (unsigned char *) &tmpmailbox;
462 		void __iomem *to = apbs[IndexCard].RamIO + RAM_FROM_PC;
463 		int c;
464 
465 		for (c = 0; c < sizeof(struct mailbox); c++)
466 			writeb(*(from++), to++);
467 	}
468 
469 	writeb(0x20, apbs[IndexCard].RamIO + TIC_OWNER_FROM_PC);
470 	writeb(0xff, apbs[IndexCard].RamIO + NUMCARD_OWNER_FROM_PC);
471 	writeb(TicCard, apbs[IndexCard].RamIO + TIC_DES_FROM_PC);
472 	writeb(NumCard, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
473 	writeb(2, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
474 	writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
475 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
476 	spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
477 	return 0;
478 }
479 
480 static int do_ac_read(int IndexCard, char __user *buf,
481 		struct st_ram_io *st_loc, struct mailbox *mailbox)
482 {
483 	void __iomem *from = apbs[IndexCard].RamIO + RAM_TO_PC;
484 	unsigned char *to = (unsigned char *)mailbox;
485 #ifdef DEBUG
486 	int c;
487 #endif
488 
489 	st_loc->tic_owner_to_pc = readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC);
490 	st_loc->numcard_owner_to_pc = readb(apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
491 
492 
493 	{
494 		int c;
495 
496 		for (c = 0; c < sizeof(struct mailbox); c++)
497 			*(to++) = readb(from++);
498 	}
499 	writeb(1, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
500 	writeb(1, apbs[IndexCard].RamIO + TYP_ACK_FROM_PC);
501 	writeb(IndexCard+1, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
502 	writeb(readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC),
503 	       apbs[IndexCard].RamIO + TIC_ACK_FROM_PC);
504 	writeb(2, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
505 	writeb(0, apbs[IndexCard].RamIO + DATA_TO_PC_READY);
506 	writeb(2, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
507 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
508 
509 #ifdef DEBUG
510 		printk("Read from applicom card #%d. struct st_ram_io follows:", NumCard);
511 
512 		for (c = 0; c < sizeof(struct st_ram_io);) {
513 			printk("\n%5.5X: %2.2X", c, ((unsigned char *)st_loc)[c]);
514 
515 			for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
516 				printk(" %2.2X", ((unsigned char *)st_loc)[c]);
517 			}
518 		}
519 
520 		printk("\nstruct mailbox follows:");
521 
522 		for (c = 0; c < sizeof(struct mailbox);) {
523 			printk("\n%5.5X: %2.2X", c, ((unsigned char *)mailbox)[c]);
524 
525 			for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
526 				printk(" %2.2X", ((unsigned char *)mailbox)[c]);
527 			}
528 		}
529 		printk("\n");
530 #endif
531 	return (sizeof(struct st_ram_io) + sizeof(struct mailbox));
532 }
533 
534 static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_t *ptr)
535 {
536 	unsigned long flags;
537 	unsigned int i;
538 	unsigned char tmp;
539 	int ret = 0;
540 	DECLARE_WAITQUEUE(wait, current);
541 #ifdef DEBUG
542 	int loopcount=0;
543 #endif
544 	/* No need to ratelimit this. Only root can trigger it anyway */
545 	if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
546 		printk( KERN_WARNING "Hmmm. read() of Applicom card, length %zd != expected %zd\n",
547 			count,sizeof(struct st_ram_io) + sizeof(struct mailbox));
548 		return -EINVAL;
549 	}
550 
551 	while(1) {
552 		/* Stick ourself on the wait queue */
553 		set_current_state(TASK_INTERRUPTIBLE);
554 		add_wait_queue(&FlagSleepRec, &wait);
555 
556 		/* Scan each board, looking for one which has a packet for us */
557 		for (i=0; i < MAX_BOARD; i++) {
558 			if (!apbs[i].RamIO)
559 				continue;
560 			spin_lock_irqsave(&apbs[i].mutex, flags);
561 
562 			tmp = readb(apbs[i].RamIO + DATA_TO_PC_READY);
563 
564 			if (tmp == 2) {
565 				struct st_ram_io st_loc;
566 				struct mailbox mailbox;
567 
568 				/* Got a packet for us */
569 				memset(&st_loc, 0, sizeof(st_loc));
570 				ret = do_ac_read(i, buf, &st_loc, &mailbox);
571 				spin_unlock_irqrestore(&apbs[i].mutex, flags);
572 				set_current_state(TASK_RUNNING);
573 				remove_wait_queue(&FlagSleepRec, &wait);
574 
575 				if (copy_to_user(buf, &st_loc, sizeof(st_loc)))
576 					return -EFAULT;
577 				if (copy_to_user(buf + sizeof(st_loc), &mailbox, sizeof(mailbox)))
578 					return -EFAULT;
579 				return tmp;
580 			}
581 
582 			if (tmp > 2) {
583 				/* Got an error */
584 				Dummy = readb(apbs[i].RamIO + VERS);
585 
586 				spin_unlock_irqrestore(&apbs[i].mutex, flags);
587 				set_current_state(TASK_RUNNING);
588 				remove_wait_queue(&FlagSleepRec, &wait);
589 
590 				printk(KERN_WARNING "APPLICOM driver read error board %d, DataToPcReady = %d\n",
591 				       i,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
592 				DeviceErrorCount++;
593 				return -EIO;
594 			}
595 
596 			/* Nothing for us. Try the next board */
597 			Dummy = readb(apbs[i].RamIO + VERS);
598 			spin_unlock_irqrestore(&apbs[i].mutex, flags);
599 
600 		} /* per board */
601 
602 		/* OK - No boards had data for us. Sleep now */
603 
604 		schedule();
605 		remove_wait_queue(&FlagSleepRec, &wait);
606 
607 		if (signal_pending(current))
608 			return -EINTR;
609 
610 #ifdef DEBUG
611 		if (loopcount++ > 2) {
612 			printk(KERN_DEBUG "Looping in ac_read. loopcount %d\n", loopcount);
613 		}
614 #endif
615 	}
616 }
617 
618 static irqreturn_t ac_interrupt(int vec, void *dev_instance)
619 {
620 	unsigned int i;
621 	unsigned int FlagInt;
622 	unsigned int LoopCount;
623 	int handled = 0;
624 
625 	//    printk("Applicom interrupt on IRQ %d occurred\n", vec);
626 
627 	LoopCount = 0;
628 
629 	do {
630 		FlagInt = 0;
631 		for (i = 0; i < MAX_BOARD; i++) {
632 
633 			/* Skip if this board doesn't exist */
634 			if (!apbs[i].RamIO)
635 				continue;
636 
637 			spin_lock(&apbs[i].mutex);
638 
639 			/* Skip if this board doesn't want attention */
640 			if(readb(apbs[i].RamIO + RAM_IT_TO_PC) == 0) {
641 				spin_unlock(&apbs[i].mutex);
642 				continue;
643 			}
644 
645 			handled = 1;
646 			FlagInt = 1;
647 			writeb(0, apbs[i].RamIO + RAM_IT_TO_PC);
648 
649 			if (readb(apbs[i].RamIO + DATA_TO_PC_READY) > 2) {
650 				printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataToPcReady = %d\n",
651 				       i+1,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
652 				DeviceErrorCount++;
653 			}
654 
655 			if((readb(apbs[i].RamIO + DATA_FROM_PC_READY) > 2) &&
656 			   (readb(apbs[i].RamIO + DATA_FROM_PC_READY) != 6)) {
657 
658 				printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataFromPcReady = %d\n",
659 				       i+1,(int)readb(apbs[i].RamIO + DATA_FROM_PC_READY));
660 				DeviceErrorCount++;
661 			}
662 
663 			if (readb(apbs[i].RamIO + DATA_TO_PC_READY) == 2) {	/* mailbox sent by the card ?   */
664 				if (waitqueue_active(&FlagSleepRec)) {
665 				wake_up_interruptible(&FlagSleepRec);
666 			}
667 			}
668 
669 			if (readb(apbs[i].RamIO + DATA_FROM_PC_READY) == 0) {	/* ram i/o free for write by pc ? */
670 				if (waitqueue_active(&apbs[i].FlagSleepSend)) {	/* process sleep during read ?    */
671 					wake_up_interruptible(&apbs[i].FlagSleepSend);
672 				}
673 			}
674 			Dummy = readb(apbs[i].RamIO + VERS);
675 
676 			if(readb(apbs[i].RamIO + RAM_IT_TO_PC)) {
677 				/* There's another int waiting on this card */
678 				spin_unlock(&apbs[i].mutex);
679 				i--;
680 			} else {
681 				spin_unlock(&apbs[i].mutex);
682 			}
683 		}
684 		if (FlagInt)
685 			LoopCount = 0;
686 		else
687 			LoopCount++;
688 	} while(LoopCount < 2);
689 	return IRQ_RETVAL(handled);
690 }
691 
692 
693 
694 static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
695 
696 {				/* @ ADG ou ATO selon le cas */
697 	int i;
698 	unsigned char IndexCard;
699 	void __iomem *pmem;
700 	int ret = 0;
701 	volatile unsigned char byte_reset_it;
702 	struct st_ram_io *adgl;
703 	void __user *argp = (void __user *)arg;
704 
705 	/* In general, the device is only openable by root anyway, so we're not
706 	   particularly concerned that bogus ioctls can flood the console. */
707 
708 	adgl = memdup_user(argp, sizeof(struct st_ram_io));
709 	if (IS_ERR(adgl))
710 		return PTR_ERR(adgl);
711 
712 	mutex_lock(&ac_mutex);
713 	IndexCard = adgl->num_card-1;
714 
715 	if(cmd != 6 && ((IndexCard >= MAX_BOARD) || !apbs[IndexCard].RamIO)) {
716 		static int warncount = 10;
717 		if (warncount) {
718 			printk( KERN_WARNING "APPLICOM driver IOCTL, bad board number %d\n",(int)IndexCard+1);
719 			warncount--;
720 		}
721 		kfree(adgl);
722 		mutex_unlock(&ac_mutex);
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 		ret = -ENOTTY;
836 		break;
837 	}
838 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
839 	kfree(adgl);
840 	mutex_unlock(&ac_mutex);
841 	return 0;
842 }
843 
844