1 /*
2 saa7146.o - driver for generic saa7146-based hardware
3
4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20
21 #include <media/saa7146.h>
22
23 LIST_HEAD(saa7146_devices);
24 DEFINE_MUTEX(saa7146_devices_lock);
25
26 static int saa7146_num;
27
28 unsigned int saa7146_debug;
29
30 module_param(saa7146_debug, uint, 0644);
31 MODULE_PARM_DESC(saa7146_debug, "debug level (default: 0)");
32
33 #if 0
34 static void dump_registers(struct saa7146_dev* dev)
35 {
36 int i = 0;
37
38 INFO((" @ %li jiffies:\n",jiffies));
39 for(i = 0; i <= 0x148; i+=4) {
40 printk("0x%03x: 0x%08x\n",i,saa7146_read(dev,i));
41 }
42 }
43 #endif
44
45 /****************************************************************************
46 * gpio and debi helper functions
47 ****************************************************************************/
48
49 void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
50 {
51 u32 value = 0;
52
53 BUG_ON(port > 3);
54
55 value = saa7146_read(dev, GPIO_CTRL);
56 value &= ~(0xff << (8*port));
57 value |= (data << (8*port));
58 saa7146_write(dev, GPIO_CTRL, value);
59 }
60
61 /* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
62 static inline int saa7146_wait_for_debi_done_sleep(struct saa7146_dev *dev,
63 unsigned long us1, unsigned long us2)
64 {
65 unsigned long timeout;
66 int err;
67
68 /* wait for registers to be programmed */
69 timeout = jiffies + usecs_to_jiffies(us1);
70 while (1) {
71 err = time_after(jiffies, timeout);
72 if (saa7146_read(dev, MC2) & 2)
73 break;
74 if (err) {
75 printk(KERN_ERR "%s: %s timed out while waiting for "
76 "registers getting programmed\n",
77 dev->name, __func__);
78 return -ETIMEDOUT;
79 }
80 msleep(1);
81 }
82
83 /* wait for transfer to complete */
84 timeout = jiffies + usecs_to_jiffies(us2);
85 while (1) {
86 err = time_after(jiffies, timeout);
87 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
88 break;
89 saa7146_read(dev, MC2);
90 if (err) {
91 DEB_S(("%s: %s timed out while waiting for transfer "
92 "completion\n", dev->name, __func__));
93 return -ETIMEDOUT;
94 }
95 msleep(1);
96 }
97
98 return 0;
99 }
100
101 static inline int saa7146_wait_for_debi_done_busyloop(struct saa7146_dev *dev,
102 unsigned long us1, unsigned long us2)
103 {
104 unsigned long loops;
105
106 /* wait for registers to be programmed */
107 loops = us1;
108 while (1) {
109 if (saa7146_read(dev, MC2) & 2)
110 break;
111 if (!loops--) {
112 printk(KERN_ERR "%s: %s timed out while waiting for "
113 "registers getting programmed\n",
114 dev->name, __func__);
115 return -ETIMEDOUT;
116 }
117 udelay(1);
118 }
119
120 /* wait for transfer to complete */
121 loops = us2 / 5;
122 while (1) {
123 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
124 break;
125 saa7146_read(dev, MC2);
126 if (!loops--) {
127 DEB_S(("%s: %s timed out while waiting for transfer "
128 "completion\n", dev->name, __func__));
129 return -ETIMEDOUT;
130 }
131 udelay(5);
132 }
133
134 return 0;
135 }
136
137 int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
138 {
139 if (nobusyloop)
140 return saa7146_wait_for_debi_done_sleep(dev, 50000, 250000);
141 else
142 return saa7146_wait_for_debi_done_busyloop(dev, 50000, 250000);
143 }
144
145 /****************************************************************************
146 * general helper functions
147 ****************************************************************************/
148
149 /* this is videobuf_vmalloc_to_sg() from videobuf-dma-sg.c
150 make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
151 may be triggered on highmem machines */
152 static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
153 {
154 struct scatterlist *sglist;
155 struct page *pg;
156 int i;
157
158 sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
159 if (NULL == sglist)
160 return NULL;
161 sg_init_table(sglist, nr_pages);
162 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
163 pg = vmalloc_to_page(virt);
164 if (NULL == pg)
165 goto err;
166 BUG_ON(PageHighMem(pg));
167 sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
168 }
169 return sglist;
170
171 err:
172 kfree(sglist);
173 return NULL;
174 }
175
176 /********************************************************************************/
177 /* common page table functions */
178
179 void *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
180 {
181 int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
182 void *mem = vmalloc_32(length);
183 int slen = 0;
184
185 if (NULL == mem)
186 goto err_null;
187
188 if (!(pt->slist = vmalloc_to_sg(mem, pages)))
189 goto err_free_mem;
190
191 if (saa7146_pgtable_alloc(pci, pt))
192 goto err_free_slist;
193
194 pt->nents = pages;
195 slen = pci_map_sg(pci,pt->slist,pt->nents,PCI_DMA_FROMDEVICE);
196 if (0 == slen)
197 goto err_free_pgtable;
198
199 if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen))
200 goto err_unmap_sg;
201
202 return mem;
203
204 err_unmap_sg:
205 pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
206 err_free_pgtable:
207 saa7146_pgtable_free(pci, pt);
208 err_free_slist:
209 kfree(pt->slist);
210 pt->slist = NULL;
211 err_free_mem:
212 vfree(mem);
213 err_null:
214 return NULL;
215 }
216
217 void saa7146_vfree_destroy_pgtable(struct pci_dev *pci, void *mem, struct saa7146_pgtable *pt)
218 {
219 pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
220 saa7146_pgtable_free(pci, pt);
221 kfree(pt->slist);
222 pt->slist = NULL;
223 vfree(mem);
224 }
225
226 void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
227 {
228 if (NULL == pt->cpu)
229 return;
230 pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
231 pt->cpu = NULL;
232 }
233
234 int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
235 {
236 __le32 *cpu;
237 dma_addr_t dma_addr = 0;
238
239 cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
240 if (NULL == cpu) {
241 return -ENOMEM;
242 }
243 pt->size = PAGE_SIZE;
244 pt->cpu = cpu;
245 pt->dma = dma_addr;
246
247 return 0;
248 }
249
250 int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
251 struct scatterlist *list, int sglen )
252 {
253 __le32 *ptr, fill;
254 int nr_pages = 0;
255 int i,p;
256
257 BUG_ON(0 == sglen);
258 BUG_ON(list->offset > PAGE_SIZE);
259
260 /* if we have a user buffer, the first page may not be
261 aligned to a page boundary. */
262 pt->offset = list->offset;
263
264 ptr = pt->cpu;
265 for (i = 0; i < sglen; i++, list++) {
266 /*
267 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
268 */
269 for (p = 0; p * 4096 < list->length; p++, ptr++) {
270 *ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
271 nr_pages++;
272 }
273 }
274
275
276 /* safety; fill the page table up with the last valid page */
277 fill = *(ptr-1);
278 for(i=nr_pages;i<1024;i++) {
279 *ptr++ = fill;
280 }
281
282 /*
283 ptr = pt->cpu;
284 printk("offset: %d\n",pt->offset);
285 for(i=0;i<5;i++) {
286 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
287 }
288 */
289 return 0;
290 }
291
292 /********************************************************************************/
293 /* interrupt handler */
294 static irqreturn_t interrupt_hw(int irq, void *dev_id)
295 {
296 struct saa7146_dev *dev = dev_id;
297 u32 isr;
298 u32 ack_isr;
299
300 /* read out the interrupt status register */
301 ack_isr = isr = saa7146_read(dev, ISR);
302
303 /* is this our interrupt? */
304 if ( 0 == isr ) {
305 /* nope, some other device */
306 return IRQ_NONE;
307 }
308
309 if (dev->ext) {
310 if (dev->ext->irq_mask & isr) {
311 if (dev->ext->irq_func)
312 dev->ext->irq_func(dev, &isr);
313 isr &= ~dev->ext->irq_mask;
314 }
315 }
316 if (0 != (isr & (MASK_27))) {
317 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
318 if (dev->vv_data && dev->vv_callback)
319 dev->vv_callback(dev,isr);
320 isr &= ~MASK_27;
321 }
322 if (0 != (isr & (MASK_28))) {
323 if (dev->vv_data && dev->vv_callback)
324 dev->vv_callback(dev,isr);
325 isr &= ~MASK_28;
326 }
327 if (0 != (isr & (MASK_16|MASK_17))) {
328 SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
329 /* only wake up if we expect something */
330 if (0 != dev->i2c_op) {
331 dev->i2c_op = 0;
332 wake_up(&dev->i2c_wq);
333 } else {
334 u32 psr = saa7146_read(dev, PSR);
335 u32 ssr = saa7146_read(dev, SSR);
336 printk(KERN_WARNING "%s: unexpected i2c irq: isr %08x psr %08x ssr %08x\n",
337 dev->name, isr, psr, ssr);
338 }
339 isr &= ~(MASK_16|MASK_17);
340 }
341 if( 0 != isr ) {
342 ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
343 ERR(("disabling interrupt source(s)!\n"));
344 SAA7146_IER_DISABLE(dev,isr);
345 }
346 saa7146_write(dev, ISR, ack_isr);
347 return IRQ_HANDLED;
348 }
349
350 /*********************************************************************************/
351 /* configuration-functions */
352
353 static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
354 {
355 struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
356 struct saa7146_extension *ext = pci_ext->ext;
357 struct saa7146_dev *dev;
358 int err = -ENOMEM;
359
360 /* clear out mem for sure */
361 dev = kzalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
362 if (!dev) {
363 ERR(("out of memory.\n"));
364 goto out;
365 }
366
367 DEB_EE(("pci:%p\n",pci));
368
369 err = pci_enable_device(pci);
370 if (err < 0) {
371 ERR(("pci_enable_device() failed.\n"));
372 goto err_free;
373 }
374
375 /* enable bus-mastering */
376 pci_set_master(pci);
377
378 dev->pci = pci;
379
380 /* get chip-revision; this is needed to enable bug-fixes */
381 err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
382 if (err < 0) {
383 ERR(("pci_read_config_dword() failed.\n"));
384 goto err_disable;
385 }
386 dev->revision &= 0xf;
387
388 /* remap the memory from virtual to physical address */
389
390 err = pci_request_region(pci, 0, "saa7146");
391 if (err < 0)
392 goto err_disable;
393
394 dev->mem = ioremap(pci_resource_start(pci, 0),
395 pci_resource_len(pci, 0));
396 if (!dev->mem) {
397 ERR(("ioremap() failed.\n"));
398 err = -ENODEV;
399 goto err_release;
400 }
401
402 /* we don't do a master reset here anymore, it screws up
403 some boards that don't have an i2c-eeprom for configuration
404 values */
405 /*
406 saa7146_write(dev, MC1, MASK_31);
407 */
408
409 /* disable all irqs */
410 saa7146_write(dev, IER, 0);
411
412 /* shut down all dma transfers and rps tasks */
413 saa7146_write(dev, MC1, 0x30ff0000);
414
415 /* clear out any rps-signals pending */
416 saa7146_write(dev, MC2, 0xf8000000);
417
418 /* request an interrupt for the saa7146 */
419 err = request_irq(pci->irq, interrupt_hw, IRQF_SHARED | IRQF_DISABLED,
420 dev->name, dev);
421 if (err < 0) {
422 ERR(("request_irq() failed.\n"));
423 goto err_unmap;
424 }
425
426 err = -ENOMEM;
427
428 /* get memory for various stuff */
429 dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
430 &dev->d_rps0.dma_handle);
431 if (!dev->d_rps0.cpu_addr)
432 goto err_free_irq;
433 memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
434
435 dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
436 &dev->d_rps1.dma_handle);
437 if (!dev->d_rps1.cpu_addr)
438 goto err_free_rps0;
439 memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
440
441 dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
442 &dev->d_i2c.dma_handle);
443 if (!dev->d_i2c.cpu_addr)
444 goto err_free_rps1;
445 memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
446
447 /* the rest + print status message */
448
449 /* create a nice device name */
450 sprintf(dev->name, "saa7146 (%d)", saa7146_num);
451
452 INFO(("found saa7146 @ mem %p (revision %d, irq %d) (0x%04x,0x%04x).\n", dev->mem, dev->revision, pci->irq, pci->subsystem_vendor, pci->subsystem_device));
453 dev->ext = ext;
454
455 mutex_init(&dev->lock);
456 spin_lock_init(&dev->int_slock);
457 spin_lock_init(&dev->slock);
458
459 mutex_init(&dev->i2c_lock);
460
461 dev->module = THIS_MODULE;
462 init_waitqueue_head(&dev->i2c_wq);
463
464 /* set some sane pci arbitrition values */
465 saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
466
467 /* TODO: use the status code of the callback */
468
469 err = -ENODEV;
470
471 if (ext->probe && ext->probe(dev)) {
472 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
473 goto err_free_i2c;
474 }
475
476 if (ext->attach(dev, pci_ext)) {
477 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
478 goto err_free_i2c;
479 }
480 /* V4L extensions will set the pci drvdata to the v4l2_device in the
481 attach() above. So for those cards that do not use V4L we have to
482 set it explicitly. */
483 pci_set_drvdata(pci, &dev->v4l2_dev);
484
485 INIT_LIST_HEAD(&dev->item);
486 list_add_tail(&dev->item,&saa7146_devices);
487 saa7146_num++;
488
489 err = 0;
490 out:
491 return err;
492
493 err_free_i2c:
494 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
495 dev->d_i2c.dma_handle);
496 err_free_rps1:
497 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
498 dev->d_rps1.dma_handle);
499 err_free_rps0:
500 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
501 dev->d_rps0.dma_handle);
502 err_free_irq:
503 free_irq(pci->irq, (void *)dev);
504 err_unmap:
505 iounmap(dev->mem);
506 err_release:
507 pci_release_region(pci, 0);
508 err_disable:
509 pci_disable_device(pci);
510 err_free:
511 kfree(dev);
512 goto out;
513 }
514
515 static void saa7146_remove_one(struct pci_dev *pdev)
516 {
517 struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
518 struct saa7146_dev *dev = to_saa7146_dev(v4l2_dev);
519 struct {
520 void *addr;
521 dma_addr_t dma;
522 } dev_map[] = {
523 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
524 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
525 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
526 { NULL, 0 }
527 }, *p;
528
529 DEB_EE(("dev:%p\n",dev));
530
531 dev->ext->detach(dev);
532 /* Zero the PCI drvdata after use. */
533 pci_set_drvdata(pdev, NULL);
534
535 /* shut down all video dma transfers */
536 saa7146_write(dev, MC1, 0x00ff0000);
537
538 /* disable all irqs, release irq-routine */
539 saa7146_write(dev, IER, 0);
540
541 free_irq(pdev->irq, dev);
542
543 for (p = dev_map; p->addr; p++)
544 pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
545
546 iounmap(dev->mem);
547 pci_release_region(pdev, 0);
548 list_del(&dev->item);
549 pci_disable_device(pdev);
550 kfree(dev);
551
552 saa7146_num--;
553 }
554
555 /*********************************************************************************/
556 /* extension handling functions */
557
558 int saa7146_register_extension(struct saa7146_extension* ext)
559 {
560 DEB_EE(("ext:%p\n",ext));
561
562 ext->driver.name = ext->name;
563 ext->driver.id_table = ext->pci_tbl;
564 ext->driver.probe = saa7146_init_one;
565 ext->driver.remove = saa7146_remove_one;
566
567 printk("saa7146: register extension '%s'.\n",ext->name);
568 return pci_register_driver(&ext->driver);
569 }
570
571 int saa7146_unregister_extension(struct saa7146_extension* ext)
572 {
573 DEB_EE(("ext:%p\n",ext));
574 printk("saa7146: unregister extension '%s'.\n",ext->name);
575 pci_unregister_driver(&ext->driver);
576 return 0;
577 }
578
579 EXPORT_SYMBOL_GPL(saa7146_register_extension);
580 EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
581
582 /* misc functions used by extension modules */
583 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
584 EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
585 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
586 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
587 EXPORT_SYMBOL_GPL(saa7146_vfree_destroy_pgtable);
588 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
589
590 EXPORT_SYMBOL_GPL(saa7146_setgpio);
591
592 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
593
594 EXPORT_SYMBOL_GPL(saa7146_debug);
595 EXPORT_SYMBOL_GPL(saa7146_devices);
596 EXPORT_SYMBOL_GPL(saa7146_devices_lock);
597
598 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
599 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
600 MODULE_LICENSE("GPL");
601
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