1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74#include <linux/module.h>
75#include <linux/kernel.h>
76#include <linux/types.h>
77#include <linux/ioport.h>
78#include <linux/interrupt.h>
79#include <linux/fcntl.h>
80#include <linux/init.h>
81#include <linux/poll.h>
82#include <linux/proc_fs.h>
83#include <linux/mutex.h>
84#include <linux/sysctl.h>
85#include <linux/fs.h>
86#include <linux/cdev.h>
87#include <linux/platform_device.h>
88#include <linux/slab.h>
89
90#include <asm/io.h>
91#include <asm/uaccess.h>
92#include <asm/system.h>
93
94#ifdef CONFIG_OF
95
96#include <linux/of_address.h>
97#include <linux/of_device.h>
98#include <linux/of_platform.h>
99#endif
100
101#include "xilinx_hwicap.h"
102#include "buffer_icap.h"
103#include "fifo_icap.h"
104
105#define DRIVER_NAME "icap"
106
107#define HWICAP_REGS (0x10000)
108
109#define XHWICAP_MAJOR 259
110#define XHWICAP_MINOR 0
111#define HWICAP_DEVICES 1
112
113
114static DEFINE_MUTEX(hwicap_mutex);
115static bool probed_devices[HWICAP_DEVICES];
116static struct mutex icap_sem;
117
118static struct class *icap_class;
119
120#define UNIMPLEMENTED 0xFFFF
121
122static const struct config_registers v2_config_registers = {
123 .CRC = 0,
124 .FAR = 1,
125 .FDRI = 2,
126 .FDRO = 3,
127 .CMD = 4,
128 .CTL = 5,
129 .MASK = 6,
130 .STAT = 7,
131 .LOUT = 8,
132 .COR = 9,
133 .MFWR = 10,
134 .FLR = 11,
135 .KEY = 12,
136 .CBC = 13,
137 .IDCODE = 14,
138 .AXSS = UNIMPLEMENTED,
139 .C0R_1 = UNIMPLEMENTED,
140 .CSOB = UNIMPLEMENTED,
141 .WBSTAR = UNIMPLEMENTED,
142 .TIMER = UNIMPLEMENTED,
143 .BOOTSTS = UNIMPLEMENTED,
144 .CTL_1 = UNIMPLEMENTED,
145};
146
147static const struct config_registers v4_config_registers = {
148 .CRC = 0,
149 .FAR = 1,
150 .FDRI = 2,
151 .FDRO = 3,
152 .CMD = 4,
153 .CTL = 5,
154 .MASK = 6,
155 .STAT = 7,
156 .LOUT = 8,
157 .COR = 9,
158 .MFWR = 10,
159 .FLR = UNIMPLEMENTED,
160 .KEY = UNIMPLEMENTED,
161 .CBC = 11,
162 .IDCODE = 12,
163 .AXSS = 13,
164 .C0R_1 = UNIMPLEMENTED,
165 .CSOB = UNIMPLEMENTED,
166 .WBSTAR = UNIMPLEMENTED,
167 .TIMER = UNIMPLEMENTED,
168 .BOOTSTS = UNIMPLEMENTED,
169 .CTL_1 = UNIMPLEMENTED,
170};
171static const struct config_registers v5_config_registers = {
172 .CRC = 0,
173 .FAR = 1,
174 .FDRI = 2,
175 .FDRO = 3,
176 .CMD = 4,
177 .CTL = 5,
178 .MASK = 6,
179 .STAT = 7,
180 .LOUT = 8,
181 .COR = 9,
182 .MFWR = 10,
183 .FLR = UNIMPLEMENTED,
184 .KEY = UNIMPLEMENTED,
185 .CBC = 11,
186 .IDCODE = 12,
187 .AXSS = 13,
188 .C0R_1 = 14,
189 .CSOB = 15,
190 .WBSTAR = 16,
191 .TIMER = 17,
192 .BOOTSTS = 18,
193 .CTL_1 = 19,
194};
195
196
197
198
199
200
201
202
203
204static int hwicap_command_desync(struct hwicap_drvdata *drvdata)
205{
206 u32 buffer[4];
207 u32 index = 0;
208
209
210
211
212 buffer[index++] = hwicap_type_1_write(drvdata->config_regs->CMD) | 1;
213 buffer[index++] = XHI_CMD_DESYNCH;
214 buffer[index++] = XHI_NOOP_PACKET;
215 buffer[index++] = XHI_NOOP_PACKET;
216
217
218
219
220
221 return drvdata->config->set_configuration(drvdata,
222 &buffer[0], index);
223}
224
225
226
227
228
229
230
231
232
233
234
235
236static int hwicap_get_configuration_register(struct hwicap_drvdata *drvdata,
237 u32 reg, u32 *reg_data)
238{
239 int status;
240 u32 buffer[6];
241 u32 index = 0;
242
243
244
245
246 buffer[index++] = XHI_DUMMY_PACKET;
247 buffer[index++] = XHI_NOOP_PACKET;
248 buffer[index++] = XHI_SYNC_PACKET;
249 buffer[index++] = XHI_NOOP_PACKET;
250 buffer[index++] = XHI_NOOP_PACKET;
251
252
253
254
255
256 status = drvdata->config->set_configuration(drvdata,
257 &buffer[0], index);
258 if (status)
259 return status;
260
261
262 status = drvdata->config->get_status(drvdata);
263 if ((status & XHI_SR_DALIGN_MASK) != XHI_SR_DALIGN_MASK)
264 return -EIO;
265
266 index = 0;
267 buffer[index++] = hwicap_type_1_read(reg) | 1;
268 buffer[index++] = XHI_NOOP_PACKET;
269 buffer[index++] = XHI_NOOP_PACKET;
270
271
272
273
274
275 status = drvdata->config->set_configuration(drvdata,
276 &buffer[0], index);
277 if (status)
278 return status;
279
280
281
282
283 status = drvdata->config->get_configuration(drvdata, reg_data, 1);
284 if (status)
285 return status;
286
287 return 0;
288}
289
290static int hwicap_initialize_hwicap(struct hwicap_drvdata *drvdata)
291{
292 int status;
293 u32 idcode;
294
295 dev_dbg(drvdata->dev, "initializing\n");
296
297
298
299 dev_dbg(drvdata->dev, "Reset...\n");
300 drvdata->config->reset(drvdata);
301
302 dev_dbg(drvdata->dev, "Desync...\n");
303 status = hwicap_command_desync(drvdata);
304 if (status)
305 return status;
306
307
308
309
310
311 dev_dbg(drvdata->dev, "Reading IDCODE...\n");
312 status = hwicap_get_configuration_register(
313 drvdata, drvdata->config_regs->IDCODE, &idcode);
314 dev_dbg(drvdata->dev, "IDCODE = %x\n", idcode);
315 if (status)
316 return status;
317
318 dev_dbg(drvdata->dev, "Desync...\n");
319 status = hwicap_command_desync(drvdata);
320 if (status)
321 return status;
322
323 return 0;
324}
325
326static ssize_t
327hwicap_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
328{
329 struct hwicap_drvdata *drvdata = file->private_data;
330 ssize_t bytes_to_read = 0;
331 u32 *kbuf;
332 u32 words;
333 u32 bytes_remaining;
334 int status;
335
336 status = mutex_lock_interruptible(&drvdata->sem);
337 if (status)
338 return status;
339
340 if (drvdata->read_buffer_in_use) {
341
342
343
344 bytes_to_read =
345 (count < drvdata->read_buffer_in_use) ? count :
346 drvdata->read_buffer_in_use;
347
348
349 if (copy_to_user(buf, drvdata->read_buffer, bytes_to_read)) {
350 status = -EFAULT;
351 goto error;
352 }
353 drvdata->read_buffer_in_use -= bytes_to_read;
354 memmove(drvdata->read_buffer,
355 drvdata->read_buffer + bytes_to_read,
356 4 - bytes_to_read);
357 } else {
358
359 kbuf = (u32 *) get_zeroed_page(GFP_KERNEL);
360 if (!kbuf) {
361 status = -ENOMEM;
362 goto error;
363 }
364
365
366
367
368
369
370
371
372
373 words = ((count + 3) >> 2);
374 bytes_to_read = words << 2;
375
376 if (bytes_to_read > PAGE_SIZE)
377 bytes_to_read = PAGE_SIZE;
378
379
380 bytes_remaining = bytes_to_read & 3;
381 bytes_to_read &= ~3;
382 words = bytes_to_read >> 2;
383
384 status = drvdata->config->get_configuration(drvdata,
385 kbuf, words);
386
387
388 if (status) {
389 free_page((unsigned long)kbuf);
390 goto error;
391 }
392
393
394 if (copy_to_user(buf, kbuf, bytes_to_read)) {
395 free_page((unsigned long)kbuf);
396 status = -EFAULT;
397 goto error;
398 }
399 memcpy(drvdata->read_buffer,
400 kbuf,
401 bytes_remaining);
402 drvdata->read_buffer_in_use = bytes_remaining;
403 free_page((unsigned long)kbuf);
404 }
405 status = bytes_to_read;
406 error:
407 mutex_unlock(&drvdata->sem);
408 return status;
409}
410
411static ssize_t
412hwicap_write(struct file *file, const char __user *buf,
413 size_t count, loff_t *ppos)
414{
415 struct hwicap_drvdata *drvdata = file->private_data;
416 ssize_t written = 0;
417 ssize_t left = count;
418 u32 *kbuf;
419 ssize_t len;
420 ssize_t status;
421
422 status = mutex_lock_interruptible(&drvdata->sem);
423 if (status)
424 return status;
425
426 left += drvdata->write_buffer_in_use;
427
428
429 if (left < 4) {
430 status = 0;
431 goto error;
432 }
433
434 kbuf = (u32 *) __get_free_page(GFP_KERNEL);
435 if (!kbuf) {
436 status = -ENOMEM;
437 goto error;
438 }
439
440 while (left > 3) {
441
442
443 len = left;
444
445 if (len > PAGE_SIZE)
446 len = PAGE_SIZE;
447 len &= ~3;
448
449 if (drvdata->write_buffer_in_use) {
450 memcpy(kbuf, drvdata->write_buffer,
451 drvdata->write_buffer_in_use);
452 if (copy_from_user(
453 (((char *)kbuf) + drvdata->write_buffer_in_use),
454 buf + written,
455 len - (drvdata->write_buffer_in_use))) {
456 free_page((unsigned long)kbuf);
457 status = -EFAULT;
458 goto error;
459 }
460 } else {
461 if (copy_from_user(kbuf, buf + written, len)) {
462 free_page((unsigned long)kbuf);
463 status = -EFAULT;
464 goto error;
465 }
466 }
467
468 status = drvdata->config->set_configuration(drvdata,
469 kbuf, len >> 2);
470
471 if (status) {
472 free_page((unsigned long)kbuf);
473 status = -EFAULT;
474 goto error;
475 }
476 if (drvdata->write_buffer_in_use) {
477 len -= drvdata->write_buffer_in_use;
478 left -= drvdata->write_buffer_in_use;
479 drvdata->write_buffer_in_use = 0;
480 }
481 written += len;
482 left -= len;
483 }
484 if ((left > 0) && (left < 4)) {
485 if (!copy_from_user(drvdata->write_buffer,
486 buf + written, left)) {
487 drvdata->write_buffer_in_use = left;
488 written += left;
489 left = 0;
490 }
491 }
492
493 free_page((unsigned long)kbuf);
494 status = written;
495 error:
496 mutex_unlock(&drvdata->sem);
497 return status;
498}
499
500static int hwicap_open(struct inode *inode, struct file *file)
501{
502 struct hwicap_drvdata *drvdata;
503 int status;
504
505 mutex_lock(&hwicap_mutex);
506 drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev);
507
508 status = mutex_lock_interruptible(&drvdata->sem);
509 if (status)
510 goto out;
511
512 if (drvdata->is_open) {
513 status = -EBUSY;
514 goto error;
515 }
516
517 status = hwicap_initialize_hwicap(drvdata);
518 if (status) {
519 dev_err(drvdata->dev, "Failed to open file");
520 goto error;
521 }
522
523 file->private_data = drvdata;
524 drvdata->write_buffer_in_use = 0;
525 drvdata->read_buffer_in_use = 0;
526 drvdata->is_open = 1;
527
528 error:
529 mutex_unlock(&drvdata->sem);
530 out:
531 mutex_unlock(&hwicap_mutex);
532 return status;
533}
534
535static int hwicap_release(struct inode *inode, struct file *file)
536{
537 struct hwicap_drvdata *drvdata = file->private_data;
538 int i;
539 int status = 0;
540
541 mutex_lock(&drvdata->sem);
542
543 if (drvdata->write_buffer_in_use) {
544
545 for (i = drvdata->write_buffer_in_use; i < 4; i++)
546 drvdata->write_buffer[i] = 0;
547
548 status = drvdata->config->set_configuration(drvdata,
549 (u32 *) drvdata->write_buffer, 1);
550 if (status)
551 goto error;
552 }
553
554 status = hwicap_command_desync(drvdata);
555 if (status)
556 goto error;
557
558 error:
559 drvdata->is_open = 0;
560 mutex_unlock(&drvdata->sem);
561 return status;
562}
563
564static const struct file_operations hwicap_fops = {
565 .owner = THIS_MODULE,
566 .write = hwicap_write,
567 .read = hwicap_read,
568 .open = hwicap_open,
569 .release = hwicap_release,
570 .llseek = noop_llseek,
571};
572
573static int __devinit hwicap_setup(struct device *dev, int id,
574 const struct resource *regs_res,
575 const struct hwicap_driver_config *config,
576 const struct config_registers *config_regs)
577{
578 dev_t devt;
579 struct hwicap_drvdata *drvdata = NULL;
580 int retval = 0;
581
582 dev_info(dev, "Xilinx icap port driver\n");
583
584 mutex_lock(&icap_sem);
585
586 if (id < 0) {
587 for (id = 0; id < HWICAP_DEVICES; id++)
588 if (!probed_devices[id])
589 break;
590 }
591 if (id < 0 || id >= HWICAP_DEVICES) {
592 mutex_unlock(&icap_sem);
593 dev_err(dev, "%s%i too large\n", DRIVER_NAME, id);
594 return -EINVAL;
595 }
596 if (probed_devices[id]) {
597 mutex_unlock(&icap_sem);
598 dev_err(dev, "cannot assign to %s%i; it is already in use\n",
599 DRIVER_NAME, id);
600 return -EBUSY;
601 }
602
603 probed_devices[id] = 1;
604 mutex_unlock(&icap_sem);
605
606 devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR + id);
607
608 drvdata = kzalloc(sizeof(struct hwicap_drvdata), GFP_KERNEL);
609 if (!drvdata) {
610 dev_err(dev, "Couldn't allocate device private record\n");
611 retval = -ENOMEM;
612 goto failed0;
613 }
614 dev_set_drvdata(dev, (void *)drvdata);
615
616 if (!regs_res) {
617 dev_err(dev, "Couldn't get registers resource\n");
618 retval = -EFAULT;
619 goto failed1;
620 }
621
622 drvdata->mem_start = regs_res->start;
623 drvdata->mem_end = regs_res->end;
624 drvdata->mem_size = regs_res->end - regs_res->start + 1;
625
626 if (!request_mem_region(drvdata->mem_start,
627 drvdata->mem_size, DRIVER_NAME)) {
628 dev_err(dev, "Couldn't lock memory region at %Lx\n",
629 (unsigned long long) regs_res->start);
630 retval = -EBUSY;
631 goto failed1;
632 }
633
634 drvdata->devt = devt;
635 drvdata->dev = dev;
636 drvdata->base_address = ioremap(drvdata->mem_start, drvdata->mem_size);
637 if (!drvdata->base_address) {
638 dev_err(dev, "ioremap() failed\n");
639 goto failed2;
640 }
641
642 drvdata->config = config;
643 drvdata->config_regs = config_regs;
644
645 mutex_init(&drvdata->sem);
646 drvdata->is_open = 0;
647
648 dev_info(dev, "ioremap %llx to %p with size %llx\n",
649 (unsigned long long) drvdata->mem_start,
650 drvdata->base_address,
651 (unsigned long long) drvdata->mem_size);
652
653 cdev_init(&drvdata->cdev, &hwicap_fops);
654 drvdata->cdev.owner = THIS_MODULE;
655 retval = cdev_add(&drvdata->cdev, devt, 1);
656 if (retval) {
657 dev_err(dev, "cdev_add() failed\n");
658 goto failed3;
659 }
660
661 device_create(icap_class, dev, devt, NULL, "%s%d", DRIVER_NAME, id);
662 return 0;
663
664 failed3:
665 iounmap(drvdata->base_address);
666
667 failed2:
668 release_mem_region(regs_res->start, drvdata->mem_size);
669
670 failed1:
671 kfree(drvdata);
672
673 failed0:
674 mutex_lock(&icap_sem);
675 probed_devices[id] = 0;
676 mutex_unlock(&icap_sem);
677
678 return retval;
679}
680
681static struct hwicap_driver_config buffer_icap_config = {
682 .get_configuration = buffer_icap_get_configuration,
683 .set_configuration = buffer_icap_set_configuration,
684 .get_status = buffer_icap_get_status,
685 .reset = buffer_icap_reset,
686};
687
688static struct hwicap_driver_config fifo_icap_config = {
689 .get_configuration = fifo_icap_get_configuration,
690 .set_configuration = fifo_icap_set_configuration,
691 .get_status = fifo_icap_get_status,
692 .reset = fifo_icap_reset,
693};
694
695static int __devexit hwicap_remove(struct device *dev)
696{
697 struct hwicap_drvdata *drvdata;
698
699 drvdata = (struct hwicap_drvdata *)dev_get_drvdata(dev);
700
701 if (!drvdata)
702 return 0;
703
704 device_destroy(icap_class, drvdata->devt);
705 cdev_del(&drvdata->cdev);
706 iounmap(drvdata->base_address);
707 release_mem_region(drvdata->mem_start, drvdata->mem_size);
708 kfree(drvdata);
709 dev_set_drvdata(dev, NULL);
710
711 mutex_lock(&icap_sem);
712 probed_devices[MINOR(dev->devt)-XHWICAP_MINOR] = 0;
713 mutex_unlock(&icap_sem);
714 return 0;
715}
716
717static int __devinit hwicap_drv_probe(struct platform_device *pdev)
718{
719 struct resource *res;
720 const struct config_registers *regs;
721 const char *family;
722
723 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
724 if (!res)
725 return -ENODEV;
726
727
728
729 regs = &v4_config_registers;
730 family = pdev->dev.platform_data;
731
732 if (family) {
733 if (!strcmp(family, "virtex2p")) {
734 regs = &v2_config_registers;
735 } else if (!strcmp(family, "virtex4")) {
736 regs = &v4_config_registers;
737 } else if (!strcmp(family, "virtex5")) {
738 regs = &v5_config_registers;
739 }
740 }
741
742 return hwicap_setup(&pdev->dev, pdev->id, res,
743 &buffer_icap_config, regs);
744}
745
746static int __devexit hwicap_drv_remove(struct platform_device *pdev)
747{
748 return hwicap_remove(&pdev->dev);
749}
750
751static struct platform_driver hwicap_platform_driver = {
752 .probe = hwicap_drv_probe,
753 .remove = hwicap_drv_remove,
754 .driver = {
755 .owner = THIS_MODULE,
756 .name = DRIVER_NAME,
757 },
758};
759
760
761
762
763
764#if defined(CONFIG_OF)
765static int __devinit
766hwicap_of_probe(struct platform_device *op, const struct of_device_id *match)
767{
768 struct resource res;
769 const unsigned int *id;
770 const char *family;
771 int rc;
772 const struct hwicap_driver_config *config = match->data;
773 const struct config_registers *regs;
774
775 dev_dbg(&op->dev, "hwicap_of_probe(%p, %p)\n", op, match);
776
777 rc = of_address_to_resource(op->dev.of_node, 0, &res);
778 if (rc) {
779 dev_err(&op->dev, "invalid address\n");
780 return rc;
781 }
782
783 id = of_get_property(op->dev.of_node, "port-number", NULL);
784
785
786
787 regs = &v4_config_registers;
788 family = of_get_property(op->dev.of_node, "xlnx,family", NULL);
789
790 if (family) {
791 if (!strcmp(family, "virtex2p")) {
792 regs = &v2_config_registers;
793 } else if (!strcmp(family, "virtex4")) {
794 regs = &v4_config_registers;
795 } else if (!strcmp(family, "virtex5")) {
796 regs = &v5_config_registers;
797 }
798 }
799 return hwicap_setup(&op->dev, id ? *id : -1, &res, config,
800 regs);
801}
802
803static int __devexit hwicap_of_remove(struct platform_device *op)
804{
805 return hwicap_remove(&op->dev);
806}
807
808
809static const struct of_device_id __devinitconst hwicap_of_match[] = {
810 { .compatible = "xlnx,opb-hwicap-1.00.b", .data = &buffer_icap_config},
811 { .compatible = "xlnx,xps-hwicap-1.00.a", .data = &fifo_icap_config},
812 {},
813};
814MODULE_DEVICE_TABLE(of, hwicap_of_match);
815
816static struct of_platform_driver hwicap_of_driver = {
817 .probe = hwicap_of_probe,
818 .remove = __devexit_p(hwicap_of_remove),
819 .driver = {
820 .name = DRIVER_NAME,
821 .owner = THIS_MODULE,
822 .of_match_table = hwicap_of_match,
823 },
824};
825
826
827static inline int __init hwicap_of_register(void)
828{
829 pr_debug("hwicap: calling of_register_platform_driver()\n");
830 return of_register_platform_driver(&hwicap_of_driver);
831}
832
833static inline void __exit hwicap_of_unregister(void)
834{
835 of_unregister_platform_driver(&hwicap_of_driver);
836}
837#else
838
839static inline int __init hwicap_of_register(void) { return 0; }
840static inline void __exit hwicap_of_unregister(void) { }
841#endif
842
843static int __init hwicap_module_init(void)
844{
845 dev_t devt;
846 int retval;
847
848 icap_class = class_create(THIS_MODULE, "xilinx_config");
849 mutex_init(&icap_sem);
850
851 devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR);
852 retval = register_chrdev_region(devt,
853 HWICAP_DEVICES,
854 DRIVER_NAME);
855 if (retval < 0)
856 return retval;
857
858 retval = platform_driver_register(&hwicap_platform_driver);
859
860 if (retval)
861 goto failed1;
862
863 retval = hwicap_of_register();
864
865 if (retval)
866 goto failed2;
867
868 return retval;
869
870 failed2:
871 platform_driver_unregister(&hwicap_platform_driver);
872
873 failed1:
874 unregister_chrdev_region(devt, HWICAP_DEVICES);
875
876 return retval;
877}
878
879static void __exit hwicap_module_cleanup(void)
880{
881 dev_t devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR);
882
883 class_destroy(icap_class);
884
885 platform_driver_unregister(&hwicap_platform_driver);
886
887 hwicap_of_unregister();
888
889 unregister_chrdev_region(devt, HWICAP_DEVICES);
890}
891
892module_init(hwicap_module_init);
893module_exit(hwicap_module_cleanup);
894
895MODULE_AUTHOR("Xilinx, Inc; Xilinx Research Labs Group");
896MODULE_DESCRIPTION("Xilinx ICAP Port Driver");
897MODULE_LICENSE("GPL");
898