xref: /openbmc/linux/drivers/char/applicom.c (revision 9a87ffc99ec8eb8d35eed7c4f816d75f5cc9662e)
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  /* dwmw2@infradead.org 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  	.llseek = no_llseek,
115  	.read = ac_read,
116  	.write = ac_write,
117  	.unlocked_ioctl = ac_ioctl,
118  };
119  
120  static struct miscdevice ac_miscdev = {
121  	AC_MINOR,
122  	"ac",
123  	&ac_fops
124  };
125  
126  static int dummy;	/* dev_id for request_irq() */
127  
ac_register_board(unsigned long physloc,void __iomem * loc,unsigned char boardno)128  static int ac_register_board(unsigned long physloc, void __iomem *loc,
129  		      unsigned char boardno)
130  {
131  	volatile unsigned char byte_reset_it;
132  
133  	if((readb(loc + CONF_END_TEST)     != 0x00) ||
134  	   (readb(loc + CONF_END_TEST + 1) != 0x55) ||
135  	   (readb(loc + CONF_END_TEST + 2) != 0xAA) ||
136  	   (readb(loc + CONF_END_TEST + 3) != 0xFF))
137  		return 0;
138  
139  	if (!boardno)
140  		boardno = readb(loc + NUMCARD_OWNER_TO_PC);
141  
142  	if (!boardno || boardno > MAX_BOARD) {
143  		printk(KERN_WARNING "Board #%d (at 0x%lx) is out of range (1 <= x <= %d).\n",
144  		       boardno, physloc, MAX_BOARD);
145  		return 0;
146  	}
147  
148  	if (apbs[boardno - 1].RamIO) {
149  		printk(KERN_WARNING "Board #%d (at 0x%lx) conflicts with previous board #%d (at 0x%lx)\n",
150  		       boardno, physloc, boardno, apbs[boardno-1].PhysIO);
151  		return 0;
152  	}
153  
154  	boardno--;
155  
156  	apbs[boardno].PhysIO = physloc;
157  	apbs[boardno].RamIO = loc;
158  	init_waitqueue_head(&apbs[boardno].FlagSleepSend);
159  	spin_lock_init(&apbs[boardno].mutex);
160  	byte_reset_it = readb(loc + RAM_IT_TO_PC);
161  
162  	numboards++;
163  	return boardno + 1;
164  }
165  
applicom_exit(void)166  static void __exit applicom_exit(void)
167  {
168  	unsigned int i;
169  
170  	misc_deregister(&ac_miscdev);
171  
172  	for (i = 0; i < MAX_BOARD; i++) {
173  
174  		if (!apbs[i].RamIO)
175  			continue;
176  
177  		if (apbs[i].irq)
178  			free_irq(apbs[i].irq, &dummy);
179  
180  		iounmap(apbs[i].RamIO);
181  	}
182  }
183  
applicom_init(void)184  static int __init applicom_init(void)
185  {
186  	int i, numisa = 0;
187  	struct pci_dev *dev = NULL;
188  	void __iomem *RamIO;
189  	int boardno, ret;
190  
191  	printk(KERN_INFO "Applicom driver: $Id: ac.c,v 1.30 2000/03/22 16:03:57 dwmw2 Exp $\n");
192  
193  	/* No mem and irq given - check for a PCI card */
194  
195  	while ( (dev = pci_get_class(PCI_CLASS_OTHERS << 16, dev))) {
196  
197  		if (!pci_match_id(applicom_pci_tbl, dev))
198  			continue;
199  
200  		if (pci_enable_device(dev)) {
201  			pci_dev_put(dev);
202  			return -EIO;
203  		}
204  
205  		RamIO = ioremap(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  			pci_dev_put(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(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 ret;
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