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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23 #include <media/drv-intf/saa7146.h>
24 #include <linux/module.h>
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 pr_info(" @ %li jiffies:\n", jiffies);
39 for (i = 0; i <= 0x148; i += 4)
40 pr_info("0x%03x: 0x%08x\n", i, saa7146_read(dev, i));
41 }
42 #endif
43
44 /****************************************************************************
45 * gpio and debi helper functions
46 ****************************************************************************/
47
saa7146_setgpio(struct saa7146_dev * dev,int port,u32 data)48 void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
49 {
50 u32 value = 0;
51
52 BUG_ON(port > 3);
53
54 value = saa7146_read(dev, GPIO_CTRL);
55 value &= ~(0xff << (8*port));
56 value |= (data << (8*port));
57 saa7146_write(dev, GPIO_CTRL, value);
58 }
59
60 /* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
saa7146_wait_for_debi_done_sleep(struct saa7146_dev * dev,unsigned long us1,unsigned long us2)61 static inline int saa7146_wait_for_debi_done_sleep(struct saa7146_dev *dev,
62 unsigned long us1, unsigned long us2)
63 {
64 unsigned long timeout;
65 int err;
66
67 /* wait for registers to be programmed */
68 timeout = jiffies + usecs_to_jiffies(us1);
69 while (1) {
70 err = time_after(jiffies, timeout);
71 if (saa7146_read(dev, MC2) & 2)
72 break;
73 if (err) {
74 pr_debug("%s: %s timed out while waiting for registers getting programmed\n",
75 dev->name, __func__);
76 return -ETIMEDOUT;
77 }
78 msleep(1);
79 }
80
81 /* wait for transfer to complete */
82 timeout = jiffies + usecs_to_jiffies(us2);
83 while (1) {
84 err = time_after(jiffies, timeout);
85 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
86 break;
87 saa7146_read(dev, MC2);
88 if (err) {
89 DEB_S("%s: %s timed out while waiting for transfer completion\n",
90 dev->name, __func__);
91 return -ETIMEDOUT;
92 }
93 msleep(1);
94 }
95
96 return 0;
97 }
98
saa7146_wait_for_debi_done_busyloop(struct saa7146_dev * dev,unsigned long us1,unsigned long us2)99 static inline int saa7146_wait_for_debi_done_busyloop(struct saa7146_dev *dev,
100 unsigned long us1, unsigned long us2)
101 {
102 unsigned long loops;
103
104 /* wait for registers to be programmed */
105 loops = us1;
106 while (1) {
107 if (saa7146_read(dev, MC2) & 2)
108 break;
109 if (!loops--) {
110 pr_err("%s: %s timed out while waiting for registers getting programmed\n",
111 dev->name, __func__);
112 return -ETIMEDOUT;
113 }
114 udelay(1);
115 }
116
117 /* wait for transfer to complete */
118 loops = us2 / 5;
119 while (1) {
120 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
121 break;
122 saa7146_read(dev, MC2);
123 if (!loops--) {
124 DEB_S("%s: %s timed out while waiting for transfer completion\n",
125 dev->name, __func__);
126 return -ETIMEDOUT;
127 }
128 udelay(5);
129 }
130
131 return 0;
132 }
133
saa7146_wait_for_debi_done(struct saa7146_dev * dev,int nobusyloop)134 int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
135 {
136 if (nobusyloop)
137 return saa7146_wait_for_debi_done_sleep(dev, 50000, 250000);
138 else
139 return saa7146_wait_for_debi_done_busyloop(dev, 50000, 250000);
140 }
141
142 /****************************************************************************
143 * general helper functions
144 ****************************************************************************/
145
146 /* this is videobuf_vmalloc_to_sg() from videobuf-dma-sg.c
147 make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
148 may be triggered on highmem machines */
vmalloc_to_sg(unsigned char * virt,int nr_pages)149 static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
150 {
151 struct scatterlist *sglist;
152 struct page *pg;
153 int i;
154
155 sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
156 if (NULL == sglist)
157 return NULL;
158 sg_init_table(sglist, nr_pages);
159 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
160 pg = vmalloc_to_page(virt);
161 if (NULL == pg)
162 goto err;
163 BUG_ON(PageHighMem(pg));
164 sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
165 }
166 return sglist;
167
168 err:
169 kfree(sglist);
170 return NULL;
171 }
172
173 /********************************************************************************/
174 /* common page table functions */
175
saa7146_vmalloc_build_pgtable(struct pci_dev * pci,long length,struct saa7146_pgtable * pt)176 void *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
177 {
178 int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
179 void *mem = vmalloc_32(length);
180 int slen = 0;
181
182 if (NULL == mem)
183 goto err_null;
184
185 if (!(pt->slist = vmalloc_to_sg(mem, pages)))
186 goto err_free_mem;
187
188 if (saa7146_pgtable_alloc(pci, pt))
189 goto err_free_slist;
190
191 pt->nents = pages;
192 slen = pci_map_sg(pci,pt->slist,pt->nents,PCI_DMA_FROMDEVICE);
193 if (0 == slen)
194 goto err_free_pgtable;
195
196 if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen))
197 goto err_unmap_sg;
198
199 return mem;
200
201 err_unmap_sg:
202 pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
203 err_free_pgtable:
204 saa7146_pgtable_free(pci, pt);
205 err_free_slist:
206 kfree(pt->slist);
207 pt->slist = NULL;
208 err_free_mem:
209 vfree(mem);
210 err_null:
211 return NULL;
212 }
213
saa7146_vfree_destroy_pgtable(struct pci_dev * pci,void * mem,struct saa7146_pgtable * pt)214 void saa7146_vfree_destroy_pgtable(struct pci_dev *pci, void *mem, struct saa7146_pgtable *pt)
215 {
216 pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
217 saa7146_pgtable_free(pci, pt);
218 kfree(pt->slist);
219 pt->slist = NULL;
220 vfree(mem);
221 }
222
saa7146_pgtable_free(struct pci_dev * pci,struct saa7146_pgtable * pt)223 void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
224 {
225 if (NULL == pt->cpu)
226 return;
227 pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
228 pt->cpu = NULL;
229 }
230
saa7146_pgtable_alloc(struct pci_dev * pci,struct saa7146_pgtable * pt)231 int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
232 {
233 __le32 *cpu;
234 dma_addr_t dma_addr = 0;
235
236 cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
237 if (NULL == cpu) {
238 return -ENOMEM;
239 }
240 pt->size = PAGE_SIZE;
241 pt->cpu = cpu;
242 pt->dma = dma_addr;
243
244 return 0;
245 }
246
saa7146_pgtable_build_single(struct pci_dev * pci,struct saa7146_pgtable * pt,struct scatterlist * list,int sglen)247 int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
248 struct scatterlist *list, int sglen )
249 {
250 __le32 *ptr, fill;
251 int nr_pages = 0;
252 int i,p;
253
254 BUG_ON(0 == sglen);
255 BUG_ON(list->offset > PAGE_SIZE);
256
257 /* if we have a user buffer, the first page may not be
258 aligned to a page boundary. */
259 pt->offset = list->offset;
260
261 ptr = pt->cpu;
262 for (i = 0; i < sglen; i++, list++) {
263 /*
264 pr_debug("i:%d, adr:0x%08x, len:%d, offset:%d\n",
265 i, sg_dma_address(list), sg_dma_len(list),
266 list->offset);
267 */
268 for (p = 0; p * 4096 < list->length; p++, ptr++) {
269 *ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
270 nr_pages++;
271 }
272 }
273
274
275 /* safety; fill the page table up with the last valid page */
276 fill = *(ptr-1);
277 for(i=nr_pages;i<1024;i++) {
278 *ptr++ = fill;
279 }
280
281 /*
282 ptr = pt->cpu;
283 pr_debug("offset: %d\n", pt->offset);
284 for(i=0;i<5;i++) {
285 pr_debug("ptr1 %d: 0x%08x\n", i, ptr[i]);
286 }
287 */
288 return 0;
289 }
290
291 /********************************************************************************/
292 /* interrupt handler */
interrupt_hw(int irq,void * dev_id)293 static irqreturn_t interrupt_hw(int irq, void *dev_id)
294 {
295 struct saa7146_dev *dev = dev_id;
296 u32 isr;
297 u32 ack_isr;
298
299 /* read out the interrupt status register */
300 ack_isr = isr = saa7146_read(dev, ISR);
301
302 /* is this our interrupt? */
303 if ( 0 == isr ) {
304 /* nope, some other device */
305 return IRQ_NONE;
306 }
307
308 if (dev->ext) {
309 if (dev->ext->irq_mask & isr) {
310 if (dev->ext->irq_func)
311 dev->ext->irq_func(dev, &isr);
312 isr &= ~dev->ext->irq_mask;
313 }
314 }
315 if (0 != (isr & (MASK_27))) {
316 DEB_INT("irq: RPS0 (0x%08x)\n", isr);
317 if (dev->vv_data && dev->vv_callback)
318 dev->vv_callback(dev,isr);
319 isr &= ~MASK_27;
320 }
321 if (0 != (isr & (MASK_28))) {
322 if (dev->vv_data && dev->vv_callback)
323 dev->vv_callback(dev,isr);
324 isr &= ~MASK_28;
325 }
326 if (0 != (isr & (MASK_16|MASK_17))) {
327 SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
328 /* only wake up if we expect something */
329 if (0 != dev->i2c_op) {
330 dev->i2c_op = 0;
331 wake_up(&dev->i2c_wq);
332 } else {
333 u32 psr = saa7146_read(dev, PSR);
334 u32 ssr = saa7146_read(dev, SSR);
335 pr_warn("%s: unexpected i2c irq: isr %08x psr %08x ssr %08x\n",
336 dev->name, isr, psr, ssr);
337 }
338 isr &= ~(MASK_16|MASK_17);
339 }
340 if( 0 != isr ) {
341 ERR("warning: interrupt enabled, but not handled properly.(0x%08x)\n",
342 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
saa7146_init_one(struct pci_dev * pci,const struct pci_device_id * ent)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 /* create a nice device name */
368 sprintf(dev->name, "saa7146 (%d)", saa7146_num);
369
370 DEB_EE("pci:%p\n", pci);
371
372 err = pci_enable_device(pci);
373 if (err < 0) {
374 ERR("pci_enable_device() failed\n");
375 goto err_free;
376 }
377
378 /* enable bus-mastering */
379 pci_set_master(pci);
380
381 dev->pci = pci;
382
383 /* get chip-revision; this is needed to enable bug-fixes */
384 dev->revision = pci->revision;
385
386 /* remap the memory from virtual to physical address */
387
388 err = pci_request_region(pci, 0, "saa7146");
389 if (err < 0)
390 goto err_disable;
391
392 dev->mem = ioremap(pci_resource_start(pci, 0),
393 pci_resource_len(pci, 0));
394 if (!dev->mem) {
395 ERR("ioremap() failed\n");
396 err = -ENODEV;
397 goto err_release;
398 }
399
400 /* we don't do a master reset here anymore, it screws up
401 some boards that don't have an i2c-eeprom for configuration
402 values */
403 /*
404 saa7146_write(dev, MC1, MASK_31);
405 */
406
407 /* disable all irqs */
408 saa7146_write(dev, IER, 0);
409
410 /* shut down all dma transfers and rps tasks */
411 saa7146_write(dev, MC1, 0x30ff0000);
412
413 /* clear out any rps-signals pending */
414 saa7146_write(dev, MC2, 0xf8000000);
415
416 /* request an interrupt for the saa7146 */
417 err = request_irq(pci->irq, interrupt_hw, IRQF_SHARED,
418 dev->name, dev);
419 if (err < 0) {
420 ERR("request_irq() failed\n");
421 goto err_unmap;
422 }
423
424 err = -ENOMEM;
425
426 /* get memory for various stuff */
427 dev->d_rps0.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
428 &dev->d_rps0.dma_handle);
429 if (!dev->d_rps0.cpu_addr)
430 goto err_free_irq;
431
432 dev->d_rps1.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
433 &dev->d_rps1.dma_handle);
434 if (!dev->d_rps1.cpu_addr)
435 goto err_free_rps0;
436
437 dev->d_i2c.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
438 &dev->d_i2c.dma_handle);
439 if (!dev->d_i2c.cpu_addr)
440 goto err_free_rps1;
441
442 /* the rest + print status message */
443
444 pr_info("found saa7146 @ mem %p (revision %d, irq %d) (0x%04x,0x%04x)\n",
445 dev->mem, dev->revision, pci->irq,
446 pci->subsystem_vendor, pci->subsystem_device);
447 dev->ext = ext;
448
449 mutex_init(&dev->v4l2_lock);
450 spin_lock_init(&dev->int_slock);
451 spin_lock_init(&dev->slock);
452
453 mutex_init(&dev->i2c_lock);
454
455 dev->module = THIS_MODULE;
456 init_waitqueue_head(&dev->i2c_wq);
457
458 /* set some sane pci arbitrition values */
459 saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
460
461 /* TODO: use the status code of the callback */
462
463 err = -ENODEV;
464
465 if (ext->probe && ext->probe(dev)) {
466 DEB_D("ext->probe() failed for %p. skipping device.\n", dev);
467 goto err_free_i2c;
468 }
469
470 if (ext->attach(dev, pci_ext)) {
471 DEB_D("ext->attach() failed for %p. skipping device.\n", dev);
472 goto err_free_i2c;
473 }
474 /* V4L extensions will set the pci drvdata to the v4l2_device in the
475 attach() above. So for those cards that do not use V4L we have to
476 set it explicitly. */
477 pci_set_drvdata(pci, &dev->v4l2_dev);
478
479 saa7146_num++;
480
481 err = 0;
482 out:
483 return err;
484
485 err_free_i2c:
486 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
487 dev->d_i2c.dma_handle);
488 err_free_rps1:
489 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
490 dev->d_rps1.dma_handle);
491 err_free_rps0:
492 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
493 dev->d_rps0.dma_handle);
494 err_free_irq:
495 free_irq(pci->irq, (void *)dev);
496 err_unmap:
497 iounmap(dev->mem);
498 err_release:
499 pci_release_region(pci, 0);
500 err_disable:
501 pci_disable_device(pci);
502 err_free:
503 kfree(dev);
504 goto out;
505 }
506
saa7146_remove_one(struct pci_dev * pdev)507 static void saa7146_remove_one(struct pci_dev *pdev)
508 {
509 struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
510 struct saa7146_dev *dev = to_saa7146_dev(v4l2_dev);
511 struct {
512 void *addr;
513 dma_addr_t dma;
514 } dev_map[] = {
515 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
516 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
517 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
518 { NULL, 0 }
519 }, *p;
520
521 DEB_EE("dev:%p\n", dev);
522
523 dev->ext->detach(dev);
524
525 /* shut down all video dma transfers */
526 saa7146_write(dev, MC1, 0x00ff0000);
527
528 /* disable all irqs, release irq-routine */
529 saa7146_write(dev, IER, 0);
530
531 free_irq(pdev->irq, dev);
532
533 for (p = dev_map; p->addr; p++)
534 pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
535
536 iounmap(dev->mem);
537 pci_release_region(pdev, 0);
538 pci_disable_device(pdev);
539 kfree(dev);
540
541 saa7146_num--;
542 }
543
544 /*********************************************************************************/
545 /* extension handling functions */
546
saa7146_register_extension(struct saa7146_extension * ext)547 int saa7146_register_extension(struct saa7146_extension* ext)
548 {
549 DEB_EE("ext:%p\n", ext);
550
551 ext->driver.name = ext->name;
552 ext->driver.id_table = ext->pci_tbl;
553 ext->driver.probe = saa7146_init_one;
554 ext->driver.remove = saa7146_remove_one;
555
556 pr_info("register extension '%s'\n", ext->name);
557 return pci_register_driver(&ext->driver);
558 }
559
saa7146_unregister_extension(struct saa7146_extension * ext)560 int saa7146_unregister_extension(struct saa7146_extension* ext)
561 {
562 DEB_EE("ext:%p\n", ext);
563 pr_info("unregister extension '%s'\n", ext->name);
564 pci_unregister_driver(&ext->driver);
565 return 0;
566 }
567
568 EXPORT_SYMBOL_GPL(saa7146_register_extension);
569 EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
570
571 /* misc functions used by extension modules */
572 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
573 EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
574 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
575 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
576 EXPORT_SYMBOL_GPL(saa7146_vfree_destroy_pgtable);
577 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
578
579 EXPORT_SYMBOL_GPL(saa7146_setgpio);
580
581 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
582
583 EXPORT_SYMBOL_GPL(saa7146_debug);
584
585 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
586 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
587 MODULE_LICENSE("GPL");
588