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20#include <linux/device.h>
21#include <linux/errno.h>
22#include <linux/fs.h>
23#include <linux/init.h>
24#include <linux/interrupt.h>
25#include <linux/io.h>
26#include <linux/kernel.h>
27#include <linux/kref.h>
28#include <linux/miscdevice.h>
29#include <linux/module.h>
30#include <linux/mutex.h>
31#include <linux/pci.h>
32#include <linux/poll.h>
33#include <linux/sched.h>
34#include <linux/slab.h>
35#include <linux/spinlock.h>
36#include <linux/time64.h>
37#include <linux/timex.h>
38#include <linux/uaccess.h>
39#include <linux/wait.h>
40#include <linux/dma-mapping.h>
41#include <linux/atomic.h>
42#include <asm/byteorder.h>
43
44#include "nosy.h"
45#include "nosy-user.h"
46
47#define TCODE_PHY_PACKET 0x10
48#define PCI_DEVICE_ID_TI_PCILYNX 0x8000
49
50static char driver_name[] = KBUILD_MODNAME;
51
52
53struct pcl {
54 __le32 next;
55 __le32 async_error_next;
56 u32 user_data;
57 __le32 pcl_status;
58 __le32 remaining_transfer_count;
59 __le32 next_data_buffer;
60 struct {
61 __le32 control;
62 __le32 pointer;
63 } buffer[13];
64};
65
66struct packet {
67 unsigned int length;
68 char data[0];
69};
70
71struct packet_buffer {
72 char *data;
73 size_t capacity;
74 long total_packet_count, lost_packet_count;
75 atomic_t size;
76 struct packet *head, *tail;
77 wait_queue_head_t wait;
78};
79
80struct pcilynx {
81 struct pci_dev *pci_device;
82 __iomem char *registers;
83
84 struct pcl *rcv_start_pcl, *rcv_pcl;
85 __le32 *rcv_buffer;
86
87 dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;
88
89 spinlock_t client_list_lock;
90 struct list_head client_list;
91
92 struct miscdevice misc;
93 struct list_head link;
94 struct kref kref;
95};
96
97static inline struct pcilynx *
98lynx_get(struct pcilynx *lynx)
99{
100 kref_get(&lynx->kref);
101
102 return lynx;
103}
104
105static void
106lynx_release(struct kref *kref)
107{
108 kfree(container_of(kref, struct pcilynx, kref));
109}
110
111static inline void
112lynx_put(struct pcilynx *lynx)
113{
114 kref_put(&lynx->kref, lynx_release);
115}
116
117struct client {
118 struct pcilynx *lynx;
119 u32 tcode_mask;
120 struct packet_buffer buffer;
121 struct list_head link;
122};
123
124static DEFINE_MUTEX(card_mutex);
125static LIST_HEAD(card_list);
126
127static int
128packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
129{
130 buffer->data = kmalloc(capacity, GFP_KERNEL);
131 if (buffer->data == NULL)
132 return -ENOMEM;
133 buffer->head = (struct packet *) buffer->data;
134 buffer->tail = (struct packet *) buffer->data;
135 buffer->capacity = capacity;
136 buffer->lost_packet_count = 0;
137 atomic_set(&buffer->size, 0);
138 init_waitqueue_head(&buffer->wait);
139
140 return 0;
141}
142
143static void
144packet_buffer_destroy(struct packet_buffer *buffer)
145{
146 kfree(buffer->data);
147}
148
149static int
150packet_buffer_get(struct client *client, char __user *data, size_t user_length)
151{
152 struct packet_buffer *buffer = &client->buffer;
153 size_t length;
154 char *end;
155
156 if (wait_event_interruptible(buffer->wait,
157 atomic_read(&buffer->size) > 0) ||
158 list_empty(&client->lynx->link))
159 return -ERESTARTSYS;
160
161 if (atomic_read(&buffer->size) == 0)
162 return -ENODEV;
163
164
165
166 end = buffer->data + buffer->capacity;
167 length = buffer->head->length;
168
169 if (&buffer->head->data[length] < end) {
170 if (copy_to_user(data, buffer->head->data, length))
171 return -EFAULT;
172 buffer->head = (struct packet *) &buffer->head->data[length];
173 } else {
174 size_t split = end - buffer->head->data;
175
176 if (copy_to_user(data, buffer->head->data, split))
177 return -EFAULT;
178 if (copy_to_user(data + split, buffer->data, length - split))
179 return -EFAULT;
180 buffer->head = (struct packet *) &buffer->data[length - split];
181 }
182
183
184
185
186
187
188 atomic_sub(sizeof(struct packet) + length, &buffer->size);
189
190 return length;
191}
192
193static void
194packet_buffer_put(struct packet_buffer *buffer, void *data, size_t length)
195{
196 char *end;
197
198 buffer->total_packet_count++;
199
200 if (buffer->capacity <
201 atomic_read(&buffer->size) + sizeof(struct packet) + length) {
202 buffer->lost_packet_count++;
203 return;
204 }
205
206 end = buffer->data + buffer->capacity;
207 buffer->tail->length = length;
208
209 if (&buffer->tail->data[length] < end) {
210 memcpy(buffer->tail->data, data, length);
211 buffer->tail = (struct packet *) &buffer->tail->data[length];
212 } else {
213 size_t split = end - buffer->tail->data;
214
215 memcpy(buffer->tail->data, data, split);
216 memcpy(buffer->data, data + split, length - split);
217 buffer->tail = (struct packet *) &buffer->data[length - split];
218 }
219
220
221
222 atomic_add(sizeof(struct packet) + length, &buffer->size);
223 wake_up_interruptible(&buffer->wait);
224}
225
226static inline void
227reg_write(struct pcilynx *lynx, int offset, u32 data)
228{
229 writel(data, lynx->registers + offset);
230}
231
232static inline u32
233reg_read(struct pcilynx *lynx, int offset)
234{
235 return readl(lynx->registers + offset);
236}
237
238static inline void
239reg_set_bits(struct pcilynx *lynx, int offset, u32 mask)
240{
241 reg_write(lynx, offset, (reg_read(lynx, offset) | mask));
242}
243
244
245
246
247
248static inline void
249run_pcl(struct pcilynx *lynx, dma_addr_t pcl_bus,
250 int dmachan)
251{
252 reg_write(lynx, DMA0_CURRENT_PCL + dmachan * 0x20, pcl_bus);
253 reg_write(lynx, DMA0_CHAN_CTRL + dmachan * 0x20,
254 DMA_CHAN_CTRL_ENABLE | DMA_CHAN_CTRL_LINK);
255}
256
257static int
258set_phy_reg(struct pcilynx *lynx, int addr, int val)
259{
260 if (addr > 15) {
261 dev_err(&lynx->pci_device->dev,
262 "PHY register address %d out of range\n", addr);
263 return -1;
264 }
265 if (val > 0xff) {
266 dev_err(&lynx->pci_device->dev,
267 "PHY register value %d out of range\n", val);
268 return -1;
269 }
270 reg_write(lynx, LINK_PHY, LINK_PHY_WRITE |
271 LINK_PHY_ADDR(addr) | LINK_PHY_WDATA(val));
272
273 return 0;
274}
275
276static int
277nosy_open(struct inode *inode, struct file *file)
278{
279 int minor = iminor(inode);
280 struct client *client;
281 struct pcilynx *tmp, *lynx = NULL;
282
283 mutex_lock(&card_mutex);
284 list_for_each_entry(tmp, &card_list, link)
285 if (tmp->misc.minor == minor) {
286 lynx = lynx_get(tmp);
287 break;
288 }
289 mutex_unlock(&card_mutex);
290 if (lynx == NULL)
291 return -ENODEV;
292
293 client = kmalloc(sizeof *client, GFP_KERNEL);
294 if (client == NULL)
295 goto fail;
296
297 client->tcode_mask = ~0;
298 client->lynx = lynx;
299 INIT_LIST_HEAD(&client->link);
300
301 if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
302 goto fail;
303
304 file->private_data = client;
305
306 return nonseekable_open(inode, file);
307fail:
308 kfree(client);
309 lynx_put(lynx);
310
311 return -ENOMEM;
312}
313
314static int
315nosy_release(struct inode *inode, struct file *file)
316{
317 struct client *client = file->private_data;
318 struct pcilynx *lynx = client->lynx;
319
320 spin_lock_irq(&lynx->client_list_lock);
321 list_del_init(&client->link);
322 spin_unlock_irq(&lynx->client_list_lock);
323
324 packet_buffer_destroy(&client->buffer);
325 kfree(client);
326 lynx_put(lynx);
327
328 return 0;
329}
330
331static unsigned int
332nosy_poll(struct file *file, poll_table *pt)
333{
334 struct client *client = file->private_data;
335 unsigned int ret = 0;
336
337 poll_wait(file, &client->buffer.wait, pt);
338
339 if (atomic_read(&client->buffer.size) > 0)
340 ret = POLLIN | POLLRDNORM;
341
342 if (list_empty(&client->lynx->link))
343 ret |= POLLHUP;
344
345 return ret;
346}
347
348static ssize_t
349nosy_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
350{
351 struct client *client = file->private_data;
352
353 return packet_buffer_get(client, buffer, count);
354}
355
356static long
357nosy_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
358{
359 struct client *client = file->private_data;
360 spinlock_t *client_list_lock = &client->lynx->client_list_lock;
361 struct nosy_stats stats;
362
363 switch (cmd) {
364 case NOSY_IOC_GET_STATS:
365 spin_lock_irq(client_list_lock);
366 stats.total_packet_count = client->buffer.total_packet_count;
367 stats.lost_packet_count = client->buffer.lost_packet_count;
368 spin_unlock_irq(client_list_lock);
369
370 if (copy_to_user((void __user *) arg, &stats, sizeof stats))
371 return -EFAULT;
372 else
373 return 0;
374
375 case NOSY_IOC_START:
376 spin_lock_irq(client_list_lock);
377 list_add_tail(&client->link, &client->lynx->client_list);
378 spin_unlock_irq(client_list_lock);
379
380 return 0;
381
382 case NOSY_IOC_STOP:
383 spin_lock_irq(client_list_lock);
384 list_del_init(&client->link);
385 spin_unlock_irq(client_list_lock);
386
387 return 0;
388
389 case NOSY_IOC_FILTER:
390 spin_lock_irq(client_list_lock);
391 client->tcode_mask = arg;
392 spin_unlock_irq(client_list_lock);
393
394 return 0;
395
396 default:
397 return -EINVAL;
398
399 }
400}
401
402static const struct file_operations nosy_ops = {
403 .owner = THIS_MODULE,
404 .read = nosy_read,
405 .unlocked_ioctl = nosy_ioctl,
406 .poll = nosy_poll,
407 .open = nosy_open,
408 .release = nosy_release,
409};
410
411#define PHY_PACKET_SIZE 12
412
413static void
414packet_irq_handler(struct pcilynx *lynx)
415{
416 struct client *client;
417 u32 tcode_mask, tcode, timestamp;
418 size_t length;
419 struct timespec64 ts64;
420
421
422
423 length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
424 tcode = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
425
426 ktime_get_real_ts64(&ts64);
427 timestamp = ts64.tv_nsec / NSEC_PER_USEC;
428 lynx->rcv_buffer[0] = (__force __le32)timestamp;
429
430 if (length == PHY_PACKET_SIZE)
431 tcode_mask = 1 << TCODE_PHY_PACKET;
432 else
433 tcode_mask = 1 << tcode;
434
435 spin_lock(&lynx->client_list_lock);
436
437 list_for_each_entry(client, &lynx->client_list, link)
438 if (client->tcode_mask & tcode_mask)
439 packet_buffer_put(&client->buffer,
440 lynx->rcv_buffer, length + 4);
441
442 spin_unlock(&lynx->client_list_lock);
443}
444
445static void
446bus_reset_irq_handler(struct pcilynx *lynx)
447{
448 struct client *client;
449 struct timespec64 ts64;
450 u32 timestamp;
451
452 ktime_get_real_ts64(&ts64);
453 timestamp = ts64.tv_nsec / NSEC_PER_USEC;
454
455 spin_lock(&lynx->client_list_lock);
456
457 list_for_each_entry(client, &lynx->client_list, link)
458 packet_buffer_put(&client->buffer, ×tamp, 4);
459
460 spin_unlock(&lynx->client_list_lock);
461}
462
463static irqreturn_t
464irq_handler(int irq, void *device)
465{
466 struct pcilynx *lynx = device;
467 u32 pci_int_status;
468
469 pci_int_status = reg_read(lynx, PCI_INT_STATUS);
470
471 if (pci_int_status == ~0)
472
473 return IRQ_NONE;
474
475 if ((pci_int_status & PCI_INT_INT_PEND) == 0)
476
477 return IRQ_NONE;
478
479 if ((pci_int_status & PCI_INT_P1394_INT) != 0) {
480 u32 link_int_status;
481
482 link_int_status = reg_read(lynx, LINK_INT_STATUS);
483 reg_write(lynx, LINK_INT_STATUS, link_int_status);
484
485 if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
486 bus_reset_irq_handler(lynx);
487 }
488
489
490
491
492
493 reg_write(lynx, PCI_INT_STATUS, pci_int_status);
494
495 if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
496 packet_irq_handler(lynx);
497 run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
498 }
499
500 return IRQ_HANDLED;
501}
502
503static void
504remove_card(struct pci_dev *dev)
505{
506 struct pcilynx *lynx = pci_get_drvdata(dev);
507 struct client *client;
508
509 mutex_lock(&card_mutex);
510 list_del_init(&lynx->link);
511 misc_deregister(&lynx->misc);
512 mutex_unlock(&card_mutex);
513
514 reg_write(lynx, PCI_INT_ENABLE, 0);
515 free_irq(lynx->pci_device->irq, lynx);
516
517 spin_lock_irq(&lynx->client_list_lock);
518 list_for_each_entry(client, &lynx->client_list, link)
519 wake_up_interruptible(&client->buffer.wait);
520 spin_unlock_irq(&lynx->client_list_lock);
521
522 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
523 lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
524 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
525 lynx->rcv_pcl, lynx->rcv_pcl_bus);
526 pci_free_consistent(lynx->pci_device, PAGE_SIZE,
527 lynx->rcv_buffer, lynx->rcv_buffer_bus);
528
529 iounmap(lynx->registers);
530 pci_disable_device(dev);
531 lynx_put(lynx);
532}
533
534#define RCV_BUFFER_SIZE (16 * 1024)
535
536static int
537add_card(struct pci_dev *dev, const struct pci_device_id *unused)
538{
539 struct pcilynx *lynx;
540 u32 p, end;
541 int ret, i;
542
543 if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
544 dev_err(&dev->dev,
545 "DMA address limits not supported for PCILynx hardware\n");
546 return -ENXIO;
547 }
548 if (pci_enable_device(dev)) {
549 dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
550 return -ENXIO;
551 }
552 pci_set_master(dev);
553
554 lynx = kzalloc(sizeof *lynx, GFP_KERNEL);
555 if (lynx == NULL) {
556 dev_err(&dev->dev, "Failed to allocate control structure\n");
557 ret = -ENOMEM;
558 goto fail_disable;
559 }
560 lynx->pci_device = dev;
561 pci_set_drvdata(dev, lynx);
562
563 spin_lock_init(&lynx->client_list_lock);
564 INIT_LIST_HEAD(&lynx->client_list);
565 kref_init(&lynx->kref);
566
567 lynx->registers = ioremap_nocache(pci_resource_start(dev, 0),
568 PCILYNX_MAX_REGISTER);
569 if (lynx->registers == NULL) {
570 dev_err(&dev->dev, "Failed to map registers\n");
571 ret = -ENOMEM;
572 goto fail_deallocate_lynx;
573 }
574
575 lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
576 sizeof(struct pcl), &lynx->rcv_start_pcl_bus);
577 lynx->rcv_pcl = pci_alloc_consistent(lynx->pci_device,
578 sizeof(struct pcl), &lynx->rcv_pcl_bus);
579 lynx->rcv_buffer = pci_alloc_consistent(lynx->pci_device,
580 RCV_BUFFER_SIZE, &lynx->rcv_buffer_bus);
581 if (lynx->rcv_start_pcl == NULL ||
582 lynx->rcv_pcl == NULL ||
583 lynx->rcv_buffer == NULL) {
584 dev_err(&dev->dev, "Failed to allocate receive buffer\n");
585 ret = -ENOMEM;
586 goto fail_deallocate_buffers;
587 }
588 lynx->rcv_start_pcl->next = cpu_to_le32(lynx->rcv_pcl_bus);
589 lynx->rcv_pcl->next = cpu_to_le32(PCL_NEXT_INVALID);
590 lynx->rcv_pcl->async_error_next = cpu_to_le32(PCL_NEXT_INVALID);
591
592 lynx->rcv_pcl->buffer[0].control =
593 cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
594 lynx->rcv_pcl->buffer[0].pointer =
595 cpu_to_le32(lynx->rcv_buffer_bus + 4);
596 p = lynx->rcv_buffer_bus + 2048;
597 end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
598 for (i = 1; p < end; i++, p += 2048) {
599 lynx->rcv_pcl->buffer[i].control =
600 cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
601 lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
602 }
603 lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);
604
605 reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
606
607 reg_write(lynx, DMA0_CHAN_CTRL, 0);
608 reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);
609
610#if 0
611
612 if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
613 lynx->phyic.reg_1394a = 1;
614 PRINT(KERN_INFO, lynx->id,
615 "found 1394a conform PHY (using extended register set)");
616 lynx->phyic.vendor = get_phy_vendorid(lynx);
617 lynx->phyic.product = get_phy_productid(lynx);
618 } else {
619 lynx->phyic.reg_1394a = 0;
620 PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
621 }
622#endif
623
624
625 reg_write(lynx, FIFO_SIZES, 255);
626
627 reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);
628
629 reg_write(lynx, LINK_INT_ENABLE,
630 LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
631 LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
632 LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
633 LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
634 LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);
635
636
637 set_phy_reg(lynx, 4, 0);
638
639
640 reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);
641
642 run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
643
644 if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
645 driver_name, lynx)) {
646 dev_err(&dev->dev,
647 "Failed to allocate shared interrupt %d\n", dev->irq);
648 ret = -EIO;
649 goto fail_deallocate_buffers;
650 }
651
652 lynx->misc.parent = &dev->dev;
653 lynx->misc.minor = MISC_DYNAMIC_MINOR;
654 lynx->misc.name = "nosy";
655 lynx->misc.fops = &nosy_ops;
656
657 mutex_lock(&card_mutex);
658 ret = misc_register(&lynx->misc);
659 if (ret) {
660 dev_err(&dev->dev, "Failed to register misc char device\n");
661 mutex_unlock(&card_mutex);
662 goto fail_free_irq;
663 }
664 list_add_tail(&lynx->link, &card_list);
665 mutex_unlock(&card_mutex);
666
667 dev_info(&dev->dev,
668 "Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
669
670 return 0;
671
672fail_free_irq:
673 reg_write(lynx, PCI_INT_ENABLE, 0);
674 free_irq(lynx->pci_device->irq, lynx);
675
676fail_deallocate_buffers:
677 if (lynx->rcv_start_pcl)
678 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
679 lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
680 if (lynx->rcv_pcl)
681 pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
682 lynx->rcv_pcl, lynx->rcv_pcl_bus);
683 if (lynx->rcv_buffer)
684 pci_free_consistent(lynx->pci_device, PAGE_SIZE,
685 lynx->rcv_buffer, lynx->rcv_buffer_bus);
686 iounmap(lynx->registers);
687
688fail_deallocate_lynx:
689 kfree(lynx);
690
691fail_disable:
692 pci_disable_device(dev);
693
694 return ret;
695}
696
697static struct pci_device_id pci_table[] = {
698 {
699 .vendor = PCI_VENDOR_ID_TI,
700 .device = PCI_DEVICE_ID_TI_PCILYNX,
701 .subvendor = PCI_ANY_ID,
702 .subdevice = PCI_ANY_ID,
703 },
704 { }
705};
706
707MODULE_DEVICE_TABLE(pci, pci_table);
708
709static struct pci_driver lynx_pci_driver = {
710 .name = driver_name,
711 .id_table = pci_table,
712 .probe = add_card,
713 .remove = remove_card,
714};
715
716module_pci_driver(lynx_pci_driver);
717
718MODULE_AUTHOR("Kristian Hoegsberg");
719MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
720MODULE_LICENSE("GPL");
721
