1/*****************************************************************************
2 *
3 * Author: Xilinx, Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"
11 * AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND
12 * SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE,
13 * OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,
14 * APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION
15 * THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,
16 * AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE
17 * FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY
18 * WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE
19 * IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR
20 * REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF
21 * INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
22 * FOR A PARTICULAR PURPOSE.
23 *
24 * (c) Copyright 2002 Xilinx Inc., Systems Engineering Group
25 * (c) Copyright 2004 Xilinx Inc., Systems Engineering Group
26 * (c) Copyright 2007-2008 Xilinx Inc.
27 * All rights reserved.
28 *
29 * You should have received a copy of the GNU General Public License along
30 * with this program; if not, write to the Free Software Foundation, Inc.,
31 * 675 Mass Ave, Cambridge, MA 02139, USA.
32 *
33 *****************************************************************************/
34
35/*
36 * This is the code behind /dev/icap* -- it allows a user-space
37 * application to use the Xilinx ICAP subsystem.
38 *
39 * The following operations are possible:
40 *
41 * open open the port and initialize for access.
42 * release release port
43 * write Write a bitstream to the configuration processor.
44 * read Read a data stream from the configuration processor.
45 *
46 * After being opened, the port is initialized and accessed to avoid a
47 * corrupted first read which may occur with some hardware. The port
48 * is left in a desynched state, requiring that a synch sequence be
49 * transmitted before any valid configuration data. A user will have
50 * exclusive access to the device while it remains open, and the state
51 * of the ICAP cannot be guaranteed after the device is closed. Note
52 * that a complete reset of the core and the state of the ICAP cannot
53 * be performed on many versions of the cores, hence users of this
54 * device should avoid making inconsistent accesses to the device. In
55 * particular, accessing the read interface, without first generating
56 * a write containing a readback packet can leave the ICAP in an
57 * inaccessible state.
58 *
59 * Note that in order to use the read interface, it is first necessary
60 * to write a request packet to the write interface. i.e., it is not
61 * possible to simply readback the bitstream (or any configuration
62 * bits) from a device without specifically requesting them first.
63 * The code to craft such packets is intended to be part of the
64 * user-space application code that uses this device. The simplest
65 * way to use this interface is simply:
66 *
67 * cp foo.bit /dev/icap0
68 *
69 * Note that unless foo.bit is an appropriately constructed partial
70 * bitstream, this has a high likelihood of overwriting the design
71 * currently programmed in the FPGA.
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/of.h>
88#include <linux/platform_device.h>
89#include <linux/property.h>
90#include <linux/slab.h>
91#include <linux/io.h>
92#include <linux/uaccess.h>
93
94#include "xilinx_hwicap.h"
95#include "buffer_icap.h"
96#include "fifo_icap.h"
97
98#define DRIVER_NAME "icap"
99
100#define HWICAP_REGS (0x10000)
101
102#define XHWICAP_MAJOR 259
103#define XHWICAP_MINOR 0
104#define HWICAP_DEVICES 1
105
106/* An array, which is set to true when the device is registered. */
107static DEFINE_MUTEX(hwicap_mutex);
108static bool probed_devices[HWICAP_DEVICES];
109static struct mutex icap_sem;
110
111static const struct class icap_class = {
112 .name = "xilinx_config",
113};
114
115#define UNIMPLEMENTED 0xFFFF
116
117static const struct config_registers v2_config_registers = {
118 .CRC = 0,
119 .FAR = 1,
120 .FDRI = 2,
121 .FDRO = 3,
122 .CMD = 4,
123 .CTL = 5,
124 .MASK = 6,
125 .STAT = 7,
126 .LOUT = 8,
127 .COR = 9,
128 .MFWR = 10,
129 .FLR = 11,
130 .KEY = 12,
131 .CBC = 13,
132 .IDCODE = 14,
133 .AXSS = UNIMPLEMENTED,
134 .C0R_1 = UNIMPLEMENTED,
135 .CSOB = UNIMPLEMENTED,
136 .WBSTAR = UNIMPLEMENTED,
137 .TIMER = UNIMPLEMENTED,
138 .BOOTSTS = UNIMPLEMENTED,
139 .CTL_1 = UNIMPLEMENTED,
140};
141
142static const struct config_registers v4_config_registers = {
143 .CRC = 0,
144 .FAR = 1,
145 .FDRI = 2,
146 .FDRO = 3,
147 .CMD = 4,
148 .CTL = 5,
149 .MASK = 6,
150 .STAT = 7,
151 .LOUT = 8,
152 .COR = 9,
153 .MFWR = 10,
154 .FLR = UNIMPLEMENTED,
155 .KEY = UNIMPLEMENTED,
156 .CBC = 11,
157 .IDCODE = 12,
158 .AXSS = 13,
159 .C0R_1 = UNIMPLEMENTED,
160 .CSOB = UNIMPLEMENTED,
161 .WBSTAR = UNIMPLEMENTED,
162 .TIMER = UNIMPLEMENTED,
163 .BOOTSTS = UNIMPLEMENTED,
164 .CTL_1 = UNIMPLEMENTED,
165};
166
167static const struct config_registers v5_config_registers = {
168 .CRC = 0,
169 .FAR = 1,
170 .FDRI = 2,
171 .FDRO = 3,
172 .CMD = 4,
173 .CTL = 5,
174 .MASK = 6,
175 .STAT = 7,
176 .LOUT = 8,
177 .COR = 9,
178 .MFWR = 10,
179 .FLR = UNIMPLEMENTED,
180 .KEY = UNIMPLEMENTED,
181 .CBC = 11,
182 .IDCODE = 12,
183 .AXSS = 13,
184 .C0R_1 = 14,
185 .CSOB = 15,
186 .WBSTAR = 16,
187 .TIMER = 17,
188 .BOOTSTS = 18,
189 .CTL_1 = 19,
190};
191
192static const struct config_registers v6_config_registers = {
193 .CRC = 0,
194 .FAR = 1,
195 .FDRI = 2,
196 .FDRO = 3,
197 .CMD = 4,
198 .CTL = 5,
199 .MASK = 6,
200 .STAT = 7,
201 .LOUT = 8,
202 .COR = 9,
203 .MFWR = 10,
204 .FLR = UNIMPLEMENTED,
205 .KEY = UNIMPLEMENTED,
206 .CBC = 11,
207 .IDCODE = 12,
208 .AXSS = 13,
209 .C0R_1 = 14,
210 .CSOB = 15,
211 .WBSTAR = 16,
212 .TIMER = 17,
213 .BOOTSTS = 22,
214 .CTL_1 = 24,
215};
216
217/**
218 * hwicap_command_desync - Send a DESYNC command to the ICAP port.
219 * @drvdata: a pointer to the drvdata.
220 *
221 * Returns: '0' on success and failure value on error
222 *
223 * This command desynchronizes the ICAP After this command, a
224 * bitstream containing a NULL packet, followed by a SYNCH packet is
225 * required before the ICAP will recognize commands.
226 */
227static int hwicap_command_desync(struct hwicap_drvdata *drvdata)
228{
229 u32 buffer[4];
230 u32 index = 0;
231
232 /*
233 * Create the data to be written to the ICAP.
234 */
235 buffer[index++] = hwicap_type_1_write(reg: drvdata->config_regs->CMD) | 1;
236 buffer[index++] = XHI_CMD_DESYNCH;
237 buffer[index++] = XHI_NOOP_PACKET;
238 buffer[index++] = XHI_NOOP_PACKET;
239
240 /*
241 * Write the data to the FIFO and initiate the transfer of data present
242 * in the FIFO to the ICAP device.
243 */
244 return drvdata->config->set_configuration(drvdata,
245 &buffer[0], index);
246}
247
248/**
249 * hwicap_get_configuration_register - Query a configuration register.
250 * @drvdata: a pointer to the drvdata.
251 * @reg: a constant which represents the configuration
252 * register value to be returned.
253 * Examples: XHI_IDCODE, XHI_FLR.
254 * @reg_data: returns the value of the register.
255 *
256 * Returns: '0' on success and failure value on error
257 *
258 * Sends a query packet to the ICAP and then receives the response.
259 * The icap is left in Synched state.
260 */
261static int hwicap_get_configuration_register(struct hwicap_drvdata *drvdata,
262 u32 reg, u32 *reg_data)
263{
264 int status;
265 u32 buffer[6];
266 u32 index = 0;
267
268 /*
269 * Create the data to be written to the ICAP.
270 */
271 buffer[index++] = XHI_DUMMY_PACKET;
272 buffer[index++] = XHI_NOOP_PACKET;
273 buffer[index++] = XHI_SYNC_PACKET;
274 buffer[index++] = XHI_NOOP_PACKET;
275 buffer[index++] = XHI_NOOP_PACKET;
276
277 /*
278 * Write the data to the FIFO and initiate the transfer of data present
279 * in the FIFO to the ICAP device.
280 */
281 status = drvdata->config->set_configuration(drvdata,
282 &buffer[0], index);
283 if (status)
284 return status;
285
286 /* If the syncword was not found, then we need to start over. */
287 status = drvdata->config->get_status(drvdata);
288 if ((status & XHI_SR_DALIGN_MASK) != XHI_SR_DALIGN_MASK)
289 return -EIO;
290
291 index = 0;
292 buffer[index++] = hwicap_type_1_read(reg) | 1;
293 buffer[index++] = XHI_NOOP_PACKET;
294 buffer[index++] = XHI_NOOP_PACKET;
295
296 /*
297 * Write the data to the FIFO and initiate the transfer of data present
298 * in the FIFO to the ICAP device.
299 */
300 status = drvdata->config->set_configuration(drvdata,
301 &buffer[0], index);
302 if (status)
303 return status;
304
305 /*
306 * Read the configuration register
307 */
308 status = drvdata->config->get_configuration(drvdata, reg_data, 1);
309 if (status)
310 return status;
311
312 return 0;
313}
314
315static int hwicap_initialize_hwicap(struct hwicap_drvdata *drvdata)
316{
317 int status;
318 u32 idcode;
319
320 dev_dbg(drvdata->dev, "initializing\n");
321
322 /* Abort any current transaction, to make sure we have the
323 * ICAP in a good state.
324 */
325 dev_dbg(drvdata->dev, "Reset...\n");
326 drvdata->config->reset(drvdata);
327
328 dev_dbg(drvdata->dev, "Desync...\n");
329 status = hwicap_command_desync(drvdata);
330 if (status)
331 return status;
332
333 /* Attempt to read the IDCODE from ICAP. This
334 * may not be returned correctly, due to the design of the
335 * hardware.
336 */
337 dev_dbg(drvdata->dev, "Reading IDCODE...\n");
338 status = hwicap_get_configuration_register(
339 drvdata, reg: drvdata->config_regs->IDCODE, reg_data: &idcode);
340 dev_dbg(drvdata->dev, "IDCODE = %x\n", idcode);
341 if (status)
342 return status;
343
344 dev_dbg(drvdata->dev, "Desync...\n");
345 status = hwicap_command_desync(drvdata);
346 if (status)
347 return status;
348
349 return 0;
350}
351
352static ssize_t
353hwicap_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
354{
355 struct hwicap_drvdata *drvdata = file->private_data;
356 ssize_t bytes_to_read = 0;
357 u32 *kbuf;
358 u32 words;
359 u32 bytes_remaining;
360 int status;
361
362 status = mutex_lock_interruptible(&drvdata->sem);
363 if (status)
364 return status;
365
366 if (drvdata->read_buffer_in_use) {
367 /* If there are leftover bytes in the buffer, just */
368 /* return them and don't try to read more from the */
369 /* ICAP device. */
370 bytes_to_read =
371 (count < drvdata->read_buffer_in_use) ? count :
372 drvdata->read_buffer_in_use;
373
374 /* Return the data currently in the read buffer. */
375 if (copy_to_user(to: buf, from: drvdata->read_buffer, n: bytes_to_read)) {
376 status = -EFAULT;
377 goto error;
378 }
379 drvdata->read_buffer_in_use -= bytes_to_read;
380 memmove(drvdata->read_buffer,
381 drvdata->read_buffer + bytes_to_read,
382 4 - bytes_to_read);
383 } else {
384 /* Get new data from the ICAP, and return what was requested. */
385 kbuf = (u32 *) get_zeroed_page(GFP_KERNEL);
386 if (!kbuf) {
387 status = -ENOMEM;
388 goto error;
389 }
390
391 /* The ICAP device is only able to read complete */
392 /* words. If a number of bytes that do not correspond */
393 /* to complete words is requested, then we read enough */
394 /* words to get the required number of bytes, and then */
395 /* save the remaining bytes for the next read. */
396
397 /* Determine the number of words to read, rounding up */
398 /* if necessary. */
399 words = ((count + 3) >> 2);
400 bytes_to_read = words << 2;
401
402 if (bytes_to_read > PAGE_SIZE)
403 bytes_to_read = PAGE_SIZE;
404
405 /* Ensure we only read a complete number of words. */
406 bytes_remaining = bytes_to_read & 3;
407 bytes_to_read &= ~3;
408 words = bytes_to_read >> 2;
409
410 status = drvdata->config->get_configuration(drvdata,
411 kbuf, words);
412
413 /* If we didn't read correctly, then bail out. */
414 if (status) {
415 free_page((unsigned long)kbuf);
416 goto error;
417 }
418
419 /* If we fail to return the data to the user, then bail out. */
420 if (copy_to_user(to: buf, from: kbuf, n: bytes_to_read)) {
421 free_page((unsigned long)kbuf);
422 status = -EFAULT;
423 goto error;
424 }
425 memcpy(drvdata->read_buffer,
426 kbuf,
427 bytes_remaining);
428 drvdata->read_buffer_in_use = bytes_remaining;
429 free_page((unsigned long)kbuf);
430 }
431 status = bytes_to_read;
432 error:
433 mutex_unlock(lock: &drvdata->sem);
434 return status;
435}
436
437static ssize_t
438hwicap_write(struct file *file, const char __user *buf,
439 size_t count, loff_t *ppos)
440{
441 struct hwicap_drvdata *drvdata = file->private_data;
442 ssize_t written = 0;
443 ssize_t left = count;
444 u32 *kbuf;
445 ssize_t len;
446 ssize_t status;
447
448 status = mutex_lock_interruptible(&drvdata->sem);
449 if (status)
450 return status;
451
452 left += drvdata->write_buffer_in_use;
453
454 /* Only write multiples of 4 bytes. */
455 if (left < 4) {
456 status = 0;
457 goto error;
458 }
459
460 kbuf = (u32 *) __get_free_page(GFP_KERNEL);
461 if (!kbuf) {
462 status = -ENOMEM;
463 goto error;
464 }
465
466 while (left > 3) {
467 /* only write multiples of 4 bytes, so there might */
468 /* be as many as 3 bytes left (at the end). */
469 len = left;
470
471 if (len > PAGE_SIZE)
472 len = PAGE_SIZE;
473 len &= ~3;
474
475 if (drvdata->write_buffer_in_use) {
476 memcpy(kbuf, drvdata->write_buffer,
477 drvdata->write_buffer_in_use);
478 if (copy_from_user(
479 to: (((char *)kbuf) + drvdata->write_buffer_in_use),
480 from: buf + written,
481 n: len - (drvdata->write_buffer_in_use))) {
482 free_page((unsigned long)kbuf);
483 status = -EFAULT;
484 goto error;
485 }
486 } else {
487 if (copy_from_user(to: kbuf, from: buf + written, n: len)) {
488 free_page((unsigned long)kbuf);
489 status = -EFAULT;
490 goto error;
491 }
492 }
493
494 status = drvdata->config->set_configuration(drvdata,
495 kbuf, len >> 2);
496
497 if (status) {
498 free_page((unsigned long)kbuf);
499 status = -EFAULT;
500 goto error;
501 }
502 if (drvdata->write_buffer_in_use) {
503 len -= drvdata->write_buffer_in_use;
504 left -= drvdata->write_buffer_in_use;
505 drvdata->write_buffer_in_use = 0;
506 }
507 written += len;
508 left -= len;
509 }
510 if ((left > 0) && (left < 4)) {
511 if (!copy_from_user(to: drvdata->write_buffer,
512 from: buf + written, n: left)) {
513 drvdata->write_buffer_in_use = left;
514 written += left;
515 left = 0;
516 }
517 }
518
519 free_page((unsigned long)kbuf);
520 status = written;
521 error:
522 mutex_unlock(lock: &drvdata->sem);
523 return status;
524}
525
526static int hwicap_open(struct inode *inode, struct file *file)
527{
528 struct hwicap_drvdata *drvdata;
529 int status;
530
531 mutex_lock(&hwicap_mutex);
532 drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev);
533
534 status = mutex_lock_interruptible(&drvdata->sem);
535 if (status)
536 goto out;
537
538 if (drvdata->is_open) {
539 status = -EBUSY;
540 goto error;
541 }
542
543 status = hwicap_initialize_hwicap(drvdata);
544 if (status) {
545 dev_err(drvdata->dev, "Failed to open file");
546 goto error;
547 }
548
549 file->private_data = drvdata;
550 drvdata->write_buffer_in_use = 0;
551 drvdata->read_buffer_in_use = 0;
552 drvdata->is_open = 1;
553
554 error:
555 mutex_unlock(lock: &drvdata->sem);
556 out:
557 mutex_unlock(lock: &hwicap_mutex);
558 return status;
559}
560
561static int hwicap_release(struct inode *inode, struct file *file)
562{
563 struct hwicap_drvdata *drvdata = file->private_data;
564 int i;
565 int status = 0;
566
567 mutex_lock(&drvdata->sem);
568
569 if (drvdata->write_buffer_in_use) {
570 /* Flush write buffer. */
571 for (i = drvdata->write_buffer_in_use; i < 4; i++)
572 drvdata->write_buffer[i] = 0;
573
574 status = drvdata->config->set_configuration(drvdata,
575 (u32 *) drvdata->write_buffer, 1);
576 if (status)
577 goto error;
578 }
579
580 status = hwicap_command_desync(drvdata);
581 if (status)
582 goto error;
583
584 error:
585 drvdata->is_open = 0;
586 mutex_unlock(lock: &drvdata->sem);
587 return status;
588}
589
590static const struct file_operations hwicap_fops = {
591 .owner = THIS_MODULE,
592 .write = hwicap_write,
593 .read = hwicap_read,
594 .open = hwicap_open,
595 .release = hwicap_release,
596 .llseek = noop_llseek,
597};
598
599static int hwicap_setup(struct platform_device *pdev, int id,
600 const struct hwicap_driver_config *config,
601 const struct config_registers *config_regs)
602{
603 dev_t devt;
604 struct hwicap_drvdata *drvdata = NULL;
605 struct device *dev = &pdev->dev;
606 int retval;
607
608 dev_info(dev, "Xilinx icap port driver\n");
609
610 mutex_lock(&icap_sem);
611
612 if (id < 0) {
613 for (id = 0; id < HWICAP_DEVICES; id++)
614 if (!probed_devices[id])
615 break;
616 }
617 if (id < 0 || id >= HWICAP_DEVICES) {
618 mutex_unlock(lock: &icap_sem);
619 dev_err(dev, "%s%i too large\n", DRIVER_NAME, id);
620 return -EINVAL;
621 }
622 if (probed_devices[id]) {
623 mutex_unlock(lock: &icap_sem);
624 dev_err(dev, "cannot assign to %s%i; it is already in use\n",
625 DRIVER_NAME, id);
626 return -EBUSY;
627 }
628
629 probed_devices[id] = 1;
630 mutex_unlock(lock: &icap_sem);
631
632 devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR + id);
633
634 drvdata = devm_kzalloc(dev, size: sizeof(struct hwicap_drvdata), GFP_KERNEL);
635 if (!drvdata) {
636 retval = -ENOMEM;
637 goto failed;
638 }
639 dev_set_drvdata(dev, data: (void *)drvdata);
640
641 drvdata->base_address = devm_platform_ioremap_resource(pdev, index: 0);
642 if (!drvdata->base_address) {
643 retval = -ENODEV;
644 goto failed;
645 }
646
647 drvdata->devt = devt;
648 drvdata->dev = dev;
649 drvdata->config = config;
650 drvdata->config_regs = config_regs;
651
652 mutex_init(&drvdata->sem);
653 drvdata->is_open = 0;
654
655 cdev_init(&drvdata->cdev, &hwicap_fops);
656 drvdata->cdev.owner = THIS_MODULE;
657 retval = cdev_add(&drvdata->cdev, devt, 1);
658 if (retval) {
659 dev_err(dev, "cdev_add() failed\n");
660 goto failed;
661 }
662
663 device_create(cls: &icap_class, parent: dev, devt, NULL, fmt: "%s%d", DRIVER_NAME, id);
664 return 0; /* success */
665
666 failed:
667 mutex_lock(&icap_sem);
668 probed_devices[id] = 0;
669 mutex_unlock(lock: &icap_sem);
670
671 return retval;
672}
673
674static struct hwicap_driver_config buffer_icap_config = {
675 .get_configuration = buffer_icap_get_configuration,
676 .set_configuration = buffer_icap_set_configuration,
677 .get_status = buffer_icap_get_status,
678 .reset = buffer_icap_reset,
679};
680
681static struct hwicap_driver_config fifo_icap_config = {
682 .get_configuration = fifo_icap_get_configuration,
683 .set_configuration = fifo_icap_set_configuration,
684 .get_status = fifo_icap_get_status,
685 .reset = fifo_icap_reset,
686};
687
688static int hwicap_drv_probe(struct platform_device *pdev)
689{
690 const struct config_registers *regs;
691 const struct hwicap_driver_config *config;
692 const char *family;
693 int id = -1;
694
695 config = device_get_match_data(dev: &pdev->dev);
696
697 of_property_read_u32(np: pdev->dev.of_node, propname: "port-number", out_value: &id);
698
699 /* It's most likely that we're using V4, if the family is not
700 * specified
701 */
702 regs = &v4_config_registers;
703 if (!of_property_read_string(np: pdev->dev.of_node, propname: "xlnx,family", out_string: &family)) {
704 if (!strcmp(family, "virtex2p"))
705 regs = &v2_config_registers;
706 else if (!strcmp(family, "virtex4"))
707 regs = &v4_config_registers;
708 else if (!strcmp(family, "virtex5"))
709 regs = &v5_config_registers;
710 else if (!strcmp(family, "virtex6"))
711 regs = &v6_config_registers;
712 }
713 return hwicap_setup(pdev, id, config, config_regs: regs);
714}
715
716static void hwicap_drv_remove(struct platform_device *pdev)
717{
718 struct device *dev = &pdev->dev;
719 struct hwicap_drvdata *drvdata;
720
721 drvdata = dev_get_drvdata(dev);
722
723 device_destroy(cls: &icap_class, devt: drvdata->devt);
724 cdev_del(&drvdata->cdev);
725
726 mutex_lock(&icap_sem);
727 probed_devices[MINOR(dev->devt)-XHWICAP_MINOR] = 0;
728 mutex_unlock(lock: &icap_sem);
729}
730
731/* Match table for device tree binding */
732static const struct of_device_id hwicap_of_match[] = {
733 { .compatible = "xlnx,opb-hwicap-1.00.b", .data = &buffer_icap_config},
734 { .compatible = "xlnx,xps-hwicap-1.00.a", .data = &fifo_icap_config},
735 {},
736};
737MODULE_DEVICE_TABLE(of, hwicap_of_match);
738
739static struct platform_driver hwicap_platform_driver = {
740 .probe = hwicap_drv_probe,
741 .remove_new = hwicap_drv_remove,
742 .driver = {
743 .name = DRIVER_NAME,
744 .of_match_table = hwicap_of_match,
745 },
746};
747
748static int __init hwicap_module_init(void)
749{
750 dev_t devt;
751 int retval;
752
753 retval = class_register(class: &icap_class);
754 if (retval)
755 return retval;
756 mutex_init(&icap_sem);
757
758 devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR);
759 retval = register_chrdev_region(devt,
760 HWICAP_DEVICES,
761 DRIVER_NAME);
762 if (retval < 0)
763 return retval;
764
765 retval = platform_driver_register(&hwicap_platform_driver);
766 if (retval)
767 goto failed;
768
769 return retval;
770
771 failed:
772 unregister_chrdev_region(devt, HWICAP_DEVICES);
773
774 return retval;
775}
776
777static void __exit hwicap_module_cleanup(void)
778{
779 dev_t devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR);
780
781 class_unregister(class: &icap_class);
782
783 platform_driver_unregister(&hwicap_platform_driver);
784
785 unregister_chrdev_region(devt, HWICAP_DEVICES);
786}
787
788module_init(hwicap_module_init);
789module_exit(hwicap_module_cleanup);
790
791MODULE_AUTHOR("Xilinx, Inc; Xilinx Research Labs Group");
792MODULE_DESCRIPTION("Xilinx ICAP Port Driver");
793MODULE_LICENSE("GPL");
794

source code of linux/drivers/char/xilinx_hwicap/xilinx_hwicap.c