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/signal.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 #include <linux/nospec.h>
36 
37 #include <asm/io.h>
38 #include <linux/uaccess.h>
39 
40 #include "applicom.h"
41 
42 
43 /* NOTE: We use for loops with {write,read}b() instead of
44    memcpy_{from,to}io throughout this driver. This is because
45    the board doesn't correctly handle word accesses - only
46    bytes.
47 */
48 
49 
50 #undef DEBUG
51 
52 #define MAX_BOARD 8		/* maximum of pc board possible */
53 #define MAX_ISA_BOARD 4
54 #define LEN_RAM_IO 0x800
55 #define AC_MINOR 157
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 MODULE_SUPPORTED_DEVICE("ac");
85 
86 
87 static struct applicom_board {
88 	unsigned long PhysIO;
89 	void __iomem *RamIO;
90 	wait_queue_head_t FlagSleepSend;
91 	long irq;
92 	spinlock_t mutex;
93 } apbs[MAX_BOARD];
94 
95 static unsigned int irq = 0;	/* interrupt number IRQ       */
96 static unsigned long mem = 0;	/* physical segment of board  */
97 
98 module_param_hw(irq, uint, irq, 0);
99 MODULE_PARM_DESC(irq, "IRQ of the Applicom board");
100 module_param_hw(mem, ulong, iomem, 0);
101 MODULE_PARM_DESC(mem, "Shared Memory Address of Applicom board");
102 
103 static unsigned int numboards;	/* number of installed boards */
104 static volatile unsigned char Dummy;
105 static DECLARE_WAIT_QUEUE_HEAD(FlagSleepRec);
106 static unsigned int WriteErrorCount;	/* number of write error      */
107 static unsigned int ReadErrorCount;	/* number of read error       */
108 static unsigned int DeviceErrorCount;	/* number of device error     */
109 
110 static ssize_t ac_read (struct file *, char __user *, size_t, loff_t *);
111 static ssize_t ac_write (struct file *, const char __user *, size_t, loff_t *);
112 static long ac_ioctl(struct file *, unsigned int, unsigned long);
113 static irqreturn_t ac_interrupt(int, void *);
114 
115 static const struct file_operations ac_fops = {
116 	.owner = THIS_MODULE,
117 	.llseek = no_llseek,
118 	.read = ac_read,
119 	.write = ac_write,
120 	.unlocked_ioctl = ac_ioctl,
121 };
122 
123 static struct miscdevice ac_miscdev = {
124 	AC_MINOR,
125 	"ac",
126 	&ac_fops
127 };
128 
129 static int dummy;	/* dev_id for request_irq() */
130 
ac_register_board(unsigned long physloc,void __iomem * loc,unsigned char boardno)131 static int ac_register_board(unsigned long physloc, void __iomem *loc,
132 		      unsigned char boardno)
133 {
134 	volatile unsigned char byte_reset_it;
135 
136 	if((readb(loc + CONF_END_TEST)     != 0x00) ||
137 	   (readb(loc + CONF_END_TEST + 1) != 0x55) ||
138 	   (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
139 	   (readb(loc + CONF_END_TEST + 3) != 0xFF))
140 		return 0;
141 
142 	if (!boardno)
143 		boardno = readb(loc + NUMCARD_OWNER_TO_PC);
144 
145 	if (!boardno || boardno > MAX_BOARD) {
146 		printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).\n",
147 		       boardno, physloc, MAX_BOARD);
148 		return 0;
149 	}
150 
151 	if (apbs[boardno - 1].RamIO) {
152 		printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)\n",
153 		       boardno, physloc, boardno, apbs[boardno-1].PhysIO);
154 		return 0;
155 	}
156 
157 	boardno--;
158 
159 	apbs[boardno].PhysIO = physloc;
160 	apbs[boardno].RamIO = loc;
161 	init_waitqueue_head(&apbs[boardno].FlagSleepSend);
162 	spin_lock_init(&apbs[boardno].mutex);
163 	byte_reset_it = readb(loc + RAM_IT_TO_PC);
164 
165 	numboards++;
166 	return boardno + 1;
167 }
168 
applicom_exit(void)169 static void __exit applicom_exit(void)
170 {
171 	unsigned int i;
172 
173 	misc_deregister(&ac_miscdev);
174 
175 	for (i = 0; i < MAX_BOARD; i++) {
176 
177 		if (!apbs[i].RamIO)
178 			continue;
179 
180 		if (apbs[i].irq)
181 			free_irq(apbs[i].irq, &dummy);
182 
183 		iounmap(apbs[i].RamIO);
184 	}
185 }
186 
applicom_init(void)187 static int __init applicom_init(void)
188 {
189 	int i, numisa = 0;
190 	struct pci_dev *dev = NULL;
191 	void __iomem *RamIO;
192 	int boardno, ret;
193 
194 	printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");
195 
196 	/* No mem and irq given - check for a PCI card */
197 
198 	while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {
199 
200 		if (!pci_match_id(applicom_pci_tbl, dev))
201 			continue;
202 
203 		if (pci_enable_device(dev))
204 			return -EIO;
205 
206 		RamIO = ioremap_nocache(pci_resource_start(dev, 0), LEN_RAM_IO);
207 
208 		if (!RamIO) {
209 			printk(KERN_INFO "ac.o: Failed to ioremap PCI memory "
210 				"space at 0x%llx\n",
211 				(unsigned long long)pci_resource_start(dev, 0));
212 			pci_disable_device(dev);
213 			return -EIO;
214 		}
215 
216 		printk(KERN_INFO "Applicom %s found at mem 0x%llx, irq %d\n",
217 		       applicom_pci_devnames[dev->device-1],
218 			   (unsigned long long)pci_resource_start(dev, 0),
219 		       dev->irq);
220 
221 		boardno = ac_register_board(pci_resource_start(dev, 0),
222 				RamIO, 0);
223 		if (!boardno) {
224 			printk(KERN_INFO "ac.o: PCI Applicom device doesn't have correct signature.\n");
225 			iounmap(RamIO);
226 			pci_disable_device(dev);
227 			continue;
228 		}
229 
230 		if (request_irq(dev->irq, &ac_interrupt, IRQF_SHARED, "Applicom PCI", &dummy)) {
231 			printk(KERN_INFO "Could not allocate IRQ %d for PCI Applicom device.\n", dev->irq);
232 			iounmap(RamIO);
233 			pci_disable_device(dev);
234 			apbs[boardno - 1].RamIO = NULL;
235 			continue;
236 		}
237 
238 		/* Enable interrupts. */
239 
240 		writeb(0x40, apbs[boardno - 1].RamIO + RAM_IT_FROM_PC);
241 
242 		apbs[boardno - 1].irq = dev->irq;
243 	}
244 
245 	/* Finished with PCI cards. If none registered,
246 	 * and there was no mem/irq specified, exit */
247 
248 	if (!mem || !irq) {
249 		if (numboards)
250 			goto fin;
251 		else {
252 			printk(KERN_INFO "ac.o: No PCI boards found.\n");
253 			printk(KERN_INFO "ac.o: For an ISA board you must supply memory and irq parameters.\n");
254 			return -ENXIO;
255 		}
256 	}
257 
258 	/* Now try the specified ISA cards */
259 
260 	for (i = 0; i < MAX_ISA_BOARD; i++) {
261 		RamIO = ioremap_nocache(mem + (LEN_RAM_IO * i), LEN_RAM_IO);
262 
263 		if (!RamIO) {
264 			printk(KERN_INFO "ac.o: Failed to ioremap the ISA card's memory space (slot #%d)\n", i + 1);
265 			continue;
266 		}
267 
268 		if (!(boardno = ac_register_board((unsigned long)mem+ (LEN_RAM_IO*i),
269 						  RamIO,i+1))) {
270 			iounmap(RamIO);
271 			continue;
272 		}
273 
274 		printk(KERN_NOTICE "Applicom ISA card found at mem 0x%lx, irq %d\n", mem + (LEN_RAM_IO*i), irq);
275 
276 		if (!numisa) {
277 			if (request_irq(irq, &ac_interrupt, IRQF_SHARED, "Applicom ISA", &dummy)) {
278 				printk(KERN_WARNING "Could not allocate IRQ %d for ISA Applicom device.\n", irq);
279 				iounmap(RamIO);
280 				apbs[boardno - 1].RamIO = NULL;
281 			}
282 			else
283 				apbs[boardno - 1].irq = irq;
284 		}
285 		else
286 			apbs[boardno - 1].irq = 0;
287 
288 		numisa++;
289 	}
290 
291 	if (!numisa)
292 		printk(KERN_WARNING "ac.o: No valid ISA Applicom boards found "
293 				"at mem 0x%lx\n", mem);
294 
295  fin:
296 	init_waitqueue_head(&FlagSleepRec);
297 
298 	WriteErrorCount = 0;
299 	ReadErrorCount = 0;
300 	DeviceErrorCount = 0;
301 
302 	if (numboards) {
303 		ret = misc_register(&ac_miscdev);
304 		if (ret) {
305 			printk(KERN_WARNING "ac.o: Unable to register misc device\n");
306 			goto out;
307 		}
308 		for (i = 0; i < MAX_BOARD; i++) {
309 			int serial;
310 			char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
311 
312 			if (!apbs[i].RamIO)
313 				continue;
314 
315 			for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
316 				boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
317 
318 			boardname[serial] = 0;
319 
320 
321 			printk(KERN_INFO "Applicom board %d: %s, PROM V%d.%d",
322 			       i+1, boardname,
323 			       (int)(readb(apbs[i].RamIO + VERS) >> 4),
324 			       (int)(readb(apbs[i].RamIO + VERS) & 0xF));
325 
326 			serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) +
327 				(readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) +
328 				(readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
329 
330 			if (serial != 0)
331 				printk(" S/N %d\n", serial);
332 			else
333 				printk("\n");
334 		}
335 		return 0;
336 	}
337 
338 	else
339 		return -ENXIO;
340 
341 out:
342 	for (i = 0; i < MAX_BOARD; i++) {
343 		if (!apbs[i].RamIO)
344 			continue;
345 		if (apbs[i].irq)
346 			free_irq(apbs[i].irq, &dummy);
347 		iounmap(apbs[i].RamIO);
348 	}
349 	return ret;
350 }
351 
352 module_init(applicom_init);
353 module_exit(applicom_exit);
354 
355 
ac_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)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 (IndexCard >= MAX_BOARD)
391 		return -EINVAL;
392 	IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
393 
394 	if (!apbs[IndexCard].RamIO)
395 		return -EINVAL;
396 
397 #ifdef DEBUG
398 	printk("Write to applicom card #%d. struct st_ram_io follows:",
399 	       IndexCard+1);
400 
401 		for (c = 0; c < sizeof(struct st_ram_io);) {
402 
403 			printk("\n%5.5X: %2.2X", c, ((unsigned char *) &st_loc)[c]);
404 
405 			for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
406 				printk(" %2.2X", ((unsigned char *) &st_loc)[c]);
407 			}
408 		}
409 
410 		printk("\nstruct mailbox follows:");
411 
412 		for (c = 0; c < sizeof(struct mailbox);) {
413 			printk("\n%5.5X: %2.2X", c, ((unsigned char *) &tmpmailbox)[c]);
414 
415 			for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
416 				printk(" %2.2X", ((unsigned char *) &tmpmailbox)[c]);
417 			}
418 		}
419 
420 		printk("\n");
421 #endif
422 
423 	spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
424 
425 	/* Test octet ready correct */
426 	if(readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) > 2) {
427 		Dummy = readb(apbs[IndexCard].RamIO + VERS);
428 		spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
429 		printk(KERN_WARNING "APPLICOM driver write error board %d, DataFromPcReady = %d\n",
430 		       IndexCard,(int)readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY));
431 		DeviceErrorCount++;
432 		return -EIO;
433 	}
434 
435 	/* Place ourselves on the wait queue */
436 	set_current_state(TASK_INTERRUPTIBLE);
437 	add_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
438 
439 	/* Check whether the card is ready for us */
440 	while (readb(apbs[IndexCard].RamIO + DATA_FROM_PC_READY) != 0) {
441 		Dummy = readb(apbs[IndexCard].RamIO + VERS);
442 		/* It's busy. Sleep. */
443 
444 		spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
445 		schedule();
446 		if (signal_pending(current)) {
447 			remove_wait_queue(&apbs[IndexCard].FlagSleepSend,
448 					  &wait);
449 			return -EINTR;
450 		}
451 		spin_lock_irqsave(&apbs[IndexCard].mutex, flags);
452 		set_current_state(TASK_INTERRUPTIBLE);
453 	}
454 
455 	/* We may not have actually slept */
456 	set_current_state(TASK_RUNNING);
457 	remove_wait_queue(&apbs[IndexCard].FlagSleepSend, &wait);
458 
459 	writeb(1, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
460 
461 	/* Which is best - lock down the pages with rawio and then
462 	   copy directly, or use bounce buffers? For now we do the latter
463 	   because it works with 2.2 still */
464 	{
465 		unsigned char *from = (unsigned char *) &tmpmailbox;
466 		void __iomem *to = apbs[IndexCard].RamIO + RAM_FROM_PC;
467 		int c;
468 
469 		for (c = 0; c < sizeof(struct mailbox); c++)
470 			writeb(*(from++), to++);
471 	}
472 
473 	writeb(0x20, apbs[IndexCard].RamIO + TIC_OWNER_FROM_PC);
474 	writeb(0xff, apbs[IndexCard].RamIO + NUMCARD_OWNER_FROM_PC);
475 	writeb(TicCard, apbs[IndexCard].RamIO + TIC_DES_FROM_PC);
476 	writeb(NumCard, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
477 	writeb(2, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
478 	writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
479 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
480 	spin_unlock_irqrestore(&apbs[IndexCard].mutex, flags);
481 	return 0;
482 }
483 
do_ac_read(int IndexCard,char __user * buf,struct st_ram_io * st_loc,struct mailbox * mailbox)484 static int do_ac_read(int IndexCard, char __user *buf,
485 		struct st_ram_io *st_loc, struct mailbox *mailbox)
486 {
487 	void __iomem *from = apbs[IndexCard].RamIO + RAM_TO_PC;
488 	unsigned char *to = (unsigned char *)mailbox;
489 #ifdef DEBUG
490 	int c;
491 #endif
492 
493 	st_loc->tic_owner_to_pc = readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC);
494 	st_loc->numcard_owner_to_pc = readb(apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
495 
496 
497 	{
498 		int c;
499 
500 		for (c = 0; c < sizeof(struct mailbox); c++)
501 			*(to++) = readb(from++);
502 	}
503 	writeb(1, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
504 	writeb(1, apbs[IndexCard].RamIO + TYP_ACK_FROM_PC);
505 	writeb(IndexCard+1, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
506 	writeb(readb(apbs[IndexCard].RamIO + TIC_OWNER_TO_PC),
507 	       apbs[IndexCard].RamIO + TIC_ACK_FROM_PC);
508 	writeb(2, apbs[IndexCard].RamIO + ACK_FROM_PC_READY);
509 	writeb(0, apbs[IndexCard].RamIO + DATA_TO_PC_READY);
510 	writeb(2, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
511 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
512 
513 #ifdef DEBUG
514 		printk("Read from applicom card #%d. struct st_ram_io follows:", NumCard);
515 
516 		for (c = 0; c < sizeof(struct st_ram_io);) {
517 			printk("\n%5.5X: %2.2X", c, ((unsigned char *)st_loc)[c]);
518 
519 			for (c++; c % 8 && c < sizeof(struct st_ram_io); c++) {
520 				printk(" %2.2X", ((unsigned char *)st_loc)[c]);
521 			}
522 		}
523 
524 		printk("\nstruct mailbox follows:");
525 
526 		for (c = 0; c < sizeof(struct mailbox);) {
527 			printk("\n%5.5X: %2.2X", c, ((unsigned char *)mailbox)[c]);
528 
529 			for (c++; c % 8 && c < sizeof(struct mailbox); c++) {
530 				printk(" %2.2X", ((unsigned char *)mailbox)[c]);
531 			}
532 		}
533 		printk("\n");
534 #endif
535 	return (sizeof(struct st_ram_io) + sizeof(struct mailbox));
536 }
537 
ac_read(struct file * filp,char __user * buf,size_t count,loff_t * ptr)538 static ssize_t ac_read (struct file *filp, char __user *buf, size_t count, loff_t *ptr)
539 {
540 	unsigned long flags;
541 	unsigned int i;
542 	unsigned char tmp;
543 	int ret = 0;
544 	DECLARE_WAITQUEUE(wait, current);
545 #ifdef DEBUG
546 	int loopcount=0;
547 #endif
548 	/* No need to ratelimit this. Only root can trigger it anyway */
549 	if (count != sizeof(struct st_ram_io) + sizeof(struct mailbox)) {
550 		printk( KERN_WARNING "Hmmm. read() of Applicom card, length %zd != expected %zd\n",
551 			count,sizeof(struct st_ram_io) + sizeof(struct mailbox));
552 		return -EINVAL;
553 	}
554 
555 	while(1) {
556 		/* Stick ourself on the wait queue */
557 		set_current_state(TASK_INTERRUPTIBLE);
558 		add_wait_queue(&FlagSleepRec, &wait);
559 
560 		/* Scan each board, looking for one which has a packet for us */
561 		for (i=0; i < MAX_BOARD; i++) {
562 			if (!apbs[i].RamIO)
563 				continue;
564 			spin_lock_irqsave(&apbs[i].mutex, flags);
565 
566 			tmp = readb(apbs[i].RamIO + DATA_TO_PC_READY);
567 
568 			if (tmp == 2) {
569 				struct st_ram_io st_loc;
570 				struct mailbox mailbox;
571 
572 				/* Got a packet for us */
573 				memset(&st_loc, 0, sizeof(st_loc));
574 				ret = do_ac_read(i, buf, &st_loc, &mailbox);
575 				spin_unlock_irqrestore(&apbs[i].mutex, flags);
576 				set_current_state(TASK_RUNNING);
577 				remove_wait_queue(&FlagSleepRec, &wait);
578 
579 				if (copy_to_user(buf, &st_loc, sizeof(st_loc)))
580 					return -EFAULT;
581 				if (copy_to_user(buf + sizeof(st_loc), &mailbox, sizeof(mailbox)))
582 					return -EFAULT;
583 				return tmp;
584 			}
585 
586 			if (tmp > 2) {
587 				/* Got an error */
588 				Dummy = readb(apbs[i].RamIO + VERS);
589 
590 				spin_unlock_irqrestore(&apbs[i].mutex, flags);
591 				set_current_state(TASK_RUNNING);
592 				remove_wait_queue(&FlagSleepRec, &wait);
593 
594 				printk(KERN_WARNING "APPLICOM driver read error board %d, DataToPcReady = %d\n",
595 				       i,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
596 				DeviceErrorCount++;
597 				return -EIO;
598 			}
599 
600 			/* Nothing for us. Try the next board */
601 			Dummy = readb(apbs[i].RamIO + VERS);
602 			spin_unlock_irqrestore(&apbs[i].mutex, flags);
603 
604 		} /* per board */
605 
606 		/* OK - No boards had data for us. Sleep now */
607 
608 		schedule();
609 		remove_wait_queue(&FlagSleepRec, &wait);
610 
611 		if (signal_pending(current))
612 			return -EINTR;
613 
614 #ifdef DEBUG
615 		if (loopcount++ > 2) {
616 			printk(KERN_DEBUG "Looping in ac_read. loopcount %d\n", loopcount);
617 		}
618 #endif
619 	}
620 }
621 
ac_interrupt(int vec,void * dev_instance)622 static irqreturn_t ac_interrupt(int vec, void *dev_instance)
623 {
624 	unsigned int i;
625 	unsigned int FlagInt;
626 	unsigned int LoopCount;
627 	int handled = 0;
628 
629 	//    printk("Applicom interrupt on IRQ %d occurred\n", vec);
630 
631 	LoopCount = 0;
632 
633 	do {
634 		FlagInt = 0;
635 		for (i = 0; i < MAX_BOARD; i++) {
636 
637 			/* Skip if this board doesn't exist */
638 			if (!apbs[i].RamIO)
639 				continue;
640 
641 			spin_lock(&apbs[i].mutex);
642 
643 			/* Skip if this board doesn't want attention */
644 			if(readb(apbs[i].RamIO + RAM_IT_TO_PC) == 0) {
645 				spin_unlock(&apbs[i].mutex);
646 				continue;
647 			}
648 
649 			handled = 1;
650 			FlagInt = 1;
651 			writeb(0, apbs[i].RamIO + RAM_IT_TO_PC);
652 
653 			if (readb(apbs[i].RamIO + DATA_TO_PC_READY) > 2) {
654 				printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataToPcReady = %d\n",
655 				       i+1,(int)readb(apbs[i].RamIO + DATA_TO_PC_READY));
656 				DeviceErrorCount++;
657 			}
658 
659 			if((readb(apbs[i].RamIO + DATA_FROM_PC_READY) > 2) &&
660 			   (readb(apbs[i].RamIO + DATA_FROM_PC_READY) != 6)) {
661 
662 				printk(KERN_WARNING "APPLICOM driver interrupt err board %d, DataFromPcReady = %d\n",
663 				       i+1,(int)readb(apbs[i].RamIO + DATA_FROM_PC_READY));
664 				DeviceErrorCount++;
665 			}
666 
667 			if (readb(apbs[i].RamIO + DATA_TO_PC_READY) == 2) {	/* mailbox sent by the card ?   */
668 				if (waitqueue_active(&FlagSleepRec)) {
669 				wake_up_interruptible(&FlagSleepRec);
670 			}
671 			}
672 
673 			if (readb(apbs[i].RamIO + DATA_FROM_PC_READY) == 0) {	/* ram i/o free for write by pc ? */
674 				if (waitqueue_active(&apbs[i].FlagSleepSend)) {	/* process sleep during read ?    */
675 					wake_up_interruptible(&apbs[i].FlagSleepSend);
676 				}
677 			}
678 			Dummy = readb(apbs[i].RamIO + VERS);
679 
680 			if(readb(apbs[i].RamIO + RAM_IT_TO_PC)) {
681 				/* There's another int waiting on this card */
682 				spin_unlock(&apbs[i].mutex);
683 				i--;
684 			} else {
685 				spin_unlock(&apbs[i].mutex);
686 			}
687 		}
688 		if (FlagInt)
689 			LoopCount = 0;
690 		else
691 			LoopCount++;
692 	} while(LoopCount < 2);
693 	return IRQ_RETVAL(handled);
694 }
695 
696 
697 
ac_ioctl(struct file * file,unsigned int cmd,unsigned long arg)698 static long ac_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
699 
700 {				/* @ ADG ou ATO selon le cas */
701 	int i;
702 	unsigned char IndexCard;
703 	void __iomem *pmem;
704 	int ret = 0;
705 	static int warncount = 10;
706 	volatile unsigned char byte_reset_it;
707 	struct st_ram_io *adgl;
708 	void __user *argp = (void __user *)arg;
709 
710 	/* In general, the device is only openable by root anyway, so we're not
711 	   particularly concerned that bogus ioctls can flood the console. */
712 
713 	adgl = memdup_user(argp, sizeof(struct st_ram_io));
714 	if (IS_ERR(adgl))
715 		return PTR_ERR(adgl);
716 
717 	mutex_lock(&ac_mutex);
718 	IndexCard = adgl->num_card-1;
719 
720 	if (cmd != 6 && IndexCard >= MAX_BOARD)
721 		goto err;
722 	IndexCard = array_index_nospec(IndexCard, MAX_BOARD);
723 
724 	if (cmd != 6 && !apbs[IndexCard].RamIO)
725 		goto err;
726 
727 	switch (cmd) {
728 
729 	case 0:
730 		pmem = apbs[IndexCard].RamIO;
731 		for (i = 0; i < sizeof(struct st_ram_io); i++)
732 			((unsigned char *)adgl)[i]=readb(pmem++);
733 		if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
734 			ret = -EFAULT;
735 		break;
736 	case 1:
737 		pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
738 		for (i = 0; i < 4; i++)
739 			adgl->conf_end_test[i] = readb(pmem++);
740 		for (i = 0; i < 2; i++)
741 			adgl->error_code[i] = readb(pmem++);
742 		for (i = 0; i < 4; i++)
743 			adgl->parameter_error[i] = readb(pmem++);
744 		pmem = apbs[IndexCard].RamIO + VERS;
745 		adgl->vers = readb(pmem);
746 		pmem = apbs[IndexCard].RamIO + TYPE_CARD;
747 		for (i = 0; i < 20; i++)
748 			adgl->reserv1[i] = readb(pmem++);
749 		*(int *)&adgl->reserv1[20] =
750 			(readb(apbs[IndexCard].RamIO + SERIAL_NUMBER) << 16) +
751 			(readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 1) << 8) +
752 			(readb(apbs[IndexCard].RamIO + SERIAL_NUMBER + 2) );
753 
754 		if (copy_to_user(argp, adgl, sizeof(struct st_ram_io)))
755 			ret = -EFAULT;
756 		break;
757 	case 2:
758 		pmem = apbs[IndexCard].RamIO + CONF_END_TEST;
759 		for (i = 0; i < 10; i++)
760 			writeb(0xff, pmem++);
761 		writeb(adgl->data_from_pc_ready,
762 		       apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
763 
764 		writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
765 
766 		for (i = 0; i < MAX_BOARD; i++) {
767 			if (apbs[i].RamIO) {
768 				byte_reset_it = readb(apbs[i].RamIO + RAM_IT_TO_PC);
769 			}
770 		}
771 		break;
772 	case 3:
773 		pmem = apbs[IndexCard].RamIO + TIC_DES_FROM_PC;
774 		writeb(adgl->tic_des_from_pc, pmem);
775 		break;
776 	case 4:
777 		pmem = apbs[IndexCard].RamIO + TIC_OWNER_TO_PC;
778 		adgl->tic_owner_to_pc     = readb(pmem++);
779 		adgl->numcard_owner_to_pc = readb(pmem);
780 		if (copy_to_user(argp, adgl,sizeof(struct st_ram_io)))
781 			ret = -EFAULT;
782 		break;
783 	case 5:
784 		writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_OWNER_TO_PC);
785 		writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_DES_FROM_PC);
786 		writeb(adgl->num_card, apbs[IndexCard].RamIO + NUMCARD_ACK_FROM_PC);
787 		writeb(4, apbs[IndexCard].RamIO + DATA_FROM_PC_READY);
788 		writeb(1, apbs[IndexCard].RamIO + RAM_IT_FROM_PC);
789 		break;
790 	case 6:
791 		printk(KERN_INFO "APPLICOM driver release .... V2.8.0 ($Revision: 1.30 $)\n");
792 		printk(KERN_INFO "Number of installed boards . %d\n", (int) numboards);
793 		printk(KERN_INFO "Segment of board ........... %X\n", (int) mem);
794 		printk(KERN_INFO "Interrupt IRQ number ....... %d\n", (int) irq);
795 		for (i = 0; i < MAX_BOARD; i++) {
796 			int serial;
797 			char boardname[(SERIAL_NUMBER - TYPE_CARD) + 1];
798 
799 			if (!apbs[i].RamIO)
800 				continue;
801 
802 			for (serial = 0; serial < SERIAL_NUMBER - TYPE_CARD; serial++)
803 				boardname[serial] = readb(apbs[i].RamIO + TYPE_CARD + serial);
804 			boardname[serial] = 0;
805 
806 			printk(KERN_INFO "Prom version board %d ....... V%d.%d %s",
807 			       i+1,
808 			       (int)(readb(apbs[i].RamIO + VERS) >> 4),
809 			       (int)(readb(apbs[i].RamIO + VERS) & 0xF),
810 			       boardname);
811 
812 
813 			serial = (readb(apbs[i].RamIO + SERIAL_NUMBER) << 16) +
814 				(readb(apbs[i].RamIO + SERIAL_NUMBER + 1) << 8) +
815 				(readb(apbs[i].RamIO + SERIAL_NUMBER + 2) );
816 
817 			if (serial != 0)
818 				printk(" S/N %d\n", serial);
819 			else
820 				printk("\n");
821 		}
822 		if (DeviceErrorCount != 0)
823 			printk(KERN_INFO "DeviceErrorCount ........... %d\n", DeviceErrorCount);
824 		if (ReadErrorCount != 0)
825 			printk(KERN_INFO "ReadErrorCount ............. %d\n", ReadErrorCount);
826 		if (WriteErrorCount != 0)
827 			printk(KERN_INFO "WriteErrorCount ............ %d\n", WriteErrorCount);
828 		if (waitqueue_active(&FlagSleepRec))
829 			printk(KERN_INFO "Process in read pending\n");
830 		for (i = 0; i < MAX_BOARD; i++) {
831 			if (apbs[i].RamIO && waitqueue_active(&apbs[i].FlagSleepSend))
832 				printk(KERN_INFO "Process in write pending board %d\n",i+1);
833 		}
834 		break;
835 	default:
836 		ret = -ENOTTY;
837 		break;
838 	}
839 	Dummy = readb(apbs[IndexCard].RamIO + VERS);
840 	kfree(adgl);
841 	mutex_unlock(&ac_mutex);
842 	return 0;
843 
844 err:
845 	if (warncount) {
846 		pr_warn("APPLICOM driver IOCTL, bad board number %d\n",
847 			(int)IndexCard + 1);
848 		warncount--;
849 	}
850 	kfree(adgl);
851 	mutex_unlock(&ac_mutex);
852 	return -EINVAL;
853 
854 }
855 
856