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V4L/DVB (3318a): Makes Some symbols static.
[deliverable/linux.git] / drivers / media / common / saa7146_core.c
CommitLineData
1da177e4
LT		 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
23LIST_HEAD(saa7146_devices);
24DECLARE_MUTEX(saa7146_devices_lock);
25
c2c62d81 26static int saa7146_num;
1da177e4 27
c2c62d81 28unsigned int saa7146_debug;
1da177e4
LT		 29
30module_param(saa7146_debug, int, 0644);
31MODULE_PARM_DESC(saa7146_debug, "debug level (default: 0)");
32
33#if 0
34static 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
49void 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 */
62int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
63{
64 unsigned long start;
25de1926 65 int err;
1da177e4
LT		 66
67 /* wait for registers to be programmed */
68 start = jiffies;
69 while (1) {
25de1926
OE		 70 err = time_after(jiffies, start + HZ/20);
71 if (saa7146_read(dev, MC2) & 2)
72 break;
73 if (err) {
1da177e4
LT		 74 DEB_S(("timed out while waiting for registers getting programmed\n"));
75 return -ETIMEDOUT;
76 }
77 if (nobusyloop)
78 msleep(1);
79 }
80
81 /* wait for transfer to complete */
82 start = jiffies;
83 while (1) {
25de1926 84 err = time_after(jiffies, start + HZ/4);
1da177e4
LT		 85 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
86 break;
87 saa7146_read(dev, MC2);
25de1926 88 if (err) {
1da177e4
LT		 89 DEB_S(("timed out while waiting for transfer completion\n"));
90 return -ETIMEDOUT;
91 }
92 if (nobusyloop)
93 msleep(1);
94 }
95
96 return 0;
97}
98
99/****************************************************************************
100 * general helper functions
101 ****************************************************************************/
102
103/* this is videobuf_vmalloc_to_sg() from video-buf.c
104 make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
105 may be triggered on highmem machines */
106static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
107{
108 struct scatterlist *sglist;
109 struct page *pg;
110 int i;
111
7408187d 112 sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
1da177e4
LT		 113 if (NULL == sglist)
114 return NULL;
1da177e4
LT		 115 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
116 pg = vmalloc_to_page(virt);
117 if (NULL == pg)
118 goto err;
119 if (PageHighMem(pg))
120 BUG();
121 sglist[i].page = pg;
122 sglist[i].length = PAGE_SIZE;
123 }
124 return sglist;
125
126 err:
127 kfree(sglist);
128 return NULL;
129}
130
131/********************************************************************************/
132/* common page table functions */
133
134char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
135{
136 int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
137 char *mem = vmalloc_32(length);
138 int slen = 0;
139
140 if (NULL == mem) {
141 return NULL;
142 }
143
144 if (!(pt->slist = vmalloc_to_sg(mem, pages))) {
145 vfree(mem);
146 return NULL;
147 }
148
149 if (saa7146_pgtable_alloc(pci, pt)) {
150 kfree(pt->slist);
151 pt->slist = NULL;
152 vfree(mem);
153 return NULL;
154 }
155
156 slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE);
157 if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) {
158 return NULL;
159 }
160
161 return mem;
162}
163
164void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
165{
166 if (NULL == pt->cpu)
167 return;
168 pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
169 pt->cpu = NULL;
f9101210
JJ		 170 kfree(pt->slist);
171 pt->slist = NULL;
1da177e4
LT		 172}
173
174int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
175{
afd1a0c9
MCC		 176 u32 *cpu;
177 dma_addr_t dma_addr;
1da177e4
LT		 178
179 cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
180 if (NULL == cpu) {
181 return -ENOMEM;
182 }
183 pt->size = PAGE_SIZE;
184 pt->cpu = cpu;
185 pt->dma = dma_addr;
186
187 return 0;
188}
189
190int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
191 struct scatterlist *list, int sglen )
192{
193 u32 *ptr, fill;
194 int nr_pages = 0;
195 int i,p;
196
197 BUG_ON(0 == sglen);
198 BUG_ON(list->offset > PAGE_SIZE);
199
200 /* if we have a user buffer, the first page may not be
201 aligned to a page boundary. */
202 pt->offset = list->offset;
203
204 ptr = pt->cpu;
205 for (i = 0; i < sglen; i++, list++) {
206/*
207 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
208*/
209 for (p = 0; p * 4096 < list->length; p++, ptr++) {
210 *ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
211 nr_pages++;
212 }
213 }
214
215
216 /* safety; fill the page table up with the last valid page */
217 fill = *(ptr-1);
218 for(i=nr_pages;i<1024;i++) {
219 *ptr++ = fill;
220 }
221
222/*
223 ptr = pt->cpu;
224 printk("offset: %d\n",pt->offset);
225 for(i=0;i<5;i++) {
226 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
227 }
228*/
229 return 0;
230}
231
232/********************************************************************************/
233/* interrupt handler */
234static irqreturn_t interrupt_hw(int irq, void *dev_id, struct pt_regs *regs)
235{
236 struct saa7146_dev *dev = dev_id;
237 u32 isr = 0;
238
239 /* read out the interrupt status register */
240 isr = saa7146_read(dev, ISR);
241
242 /* is this our interrupt? */
243 if ( 0 == isr ) {
244 /* nope, some other device */
245 return IRQ_NONE;
246 }
247
248 saa7146_write(dev, ISR, isr);
249
250 if( 0 != (dev->ext)) {
251 if( 0 != (dev->ext->irq_mask & isr )) {
252 if( 0 != dev->ext->irq_func ) {
253 dev->ext->irq_func(dev, &isr);
254 }
255 isr &= ~dev->ext->irq_mask;
256 }
257 }
258 if (0 != (isr & (MASK_27))) {
259 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
260 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
261 dev->vv_callback(dev,isr);
262 }
263 isr &= ~MASK_27;
264 }
265 if (0 != (isr & (MASK_28))) {
266 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
267 dev->vv_callback(dev,isr);
268 }
269 isr &= ~MASK_28;
270 }
271 if (0 != (isr & (MASK_16|MASK_17))) {
272 u32 status = saa7146_read(dev, I2C_STATUS);
273 if( (0x3 == (status & 0x3)) || (0 == (status & 0x1)) ) {
274 SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
275 /* only wake up if we expect something */
276 if( 0 != dev->i2c_op ) {
277 u32 psr = (saa7146_read(dev, PSR) >> 16) & 0x2;
278 u32 ssr = (saa7146_read(dev, SSR) >> 17) & 0x1f;
279 DEB_I2C(("irq: i2c, status: 0x%08x, psr:0x%02x, ssr:0x%02x).\n",status,psr,ssr));
280 dev->i2c_op = 0;
281 wake_up(&dev->i2c_wq);
282 } else {
283 DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
284 }
285 } else {
286 DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
287 }
288 isr &= ~(MASK_16|MASK_17);
289 }
290 if( 0 != isr ) {
291 ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
292 ERR(("disabling interrupt source(s)!\n"));
293 SAA7146_IER_DISABLE(dev,isr);
294 }
295 return IRQ_HANDLED;
296}
297
298/*********************************************************************************/
299/* configuration-functions */
300
301static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
302{
303 struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
304 struct saa7146_extension *ext = pci_ext->ext;
305 struct saa7146_dev *dev;
306 int err = -ENOMEM;
307
7408187d
PI		 308 /* clear out mem for sure */
309 dev = kzalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
1da177e4
LT		 310 if (!dev) {
311 ERR(("out of memory.\n"));
312 goto out;
313 }
314
1da177e4
LT		 315 DEB_EE(("pci:%p\n",pci));
316
317 err = pci_enable_device(pci);
318 if (err < 0) {
319 ERR(("pci_enable_device() failed.\n"));
320 goto err_free;
321 }
322
323 /* enable bus-mastering */
324 pci_set_master(pci);
325
326 dev->pci = pci;
327
328 /* get chip-revision; this is needed to enable bug-fixes */
329 err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
330 if (err < 0) {
331 ERR(("pci_read_config_dword() failed.\n"));
332 goto err_disable;
333 }
334 dev->revision &= 0xf;
335
336 /* remap the memory from virtual to physical adress */
337
338 err = pci_request_region(pci, 0, "saa7146");
339 if (err < 0)
340 goto err_disable;
341
342 dev->mem = ioremap(pci_resource_start(pci, 0),
343 pci_resource_len(pci, 0));
344 if (!dev->mem) {
345 ERR(("ioremap() failed.\n"));
346 err = -ENODEV;
347 goto err_release;
348 }
349
350 /* we don't do a master reset here anymore, it screws up
351 some boards that don't have an i2c-eeprom for configuration
352 values */
353/*
354 saa7146_write(dev, MC1, MASK_31);
355*/
356
357 /* disable all irqs */
358 saa7146_write(dev, IER, 0);
359
360 /* shut down all dma transfers and rps tasks */
361 saa7146_write(dev, MC1, 0x30ff0000);
362
363 /* clear out any rps-signals pending */
364 saa7146_write(dev, MC2, 0xf8000000);
365
366 /* request an interrupt for the saa7146 */
367 err = request_irq(pci->irq, interrupt_hw, SA_SHIRQ | SA_INTERRUPT,
368 dev->name, dev);
369 if (err < 0) {
370 ERR(("request_irq() failed.\n"));
371 goto err_unmap;
372 }
373
374 err = -ENOMEM;
375
376 /* get memory for various stuff */
377 dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
378 &dev->d_rps0.dma_handle);
379 if (!dev->d_rps0.cpu_addr)
380 goto err_free_irq;
381 memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
382
383 dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
384 &dev->d_rps1.dma_handle);
385 if (!dev->d_rps1.cpu_addr)
386 goto err_free_rps0;
387 memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
388
389 dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
390 &dev->d_i2c.dma_handle);
391 if (!dev->d_i2c.cpu_addr)
392 goto err_free_rps1;
393 memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
394
395 /* the rest + print status message */
396
397 /* create a nice device name */
398 sprintf(dev->name, "saa7146 (%d)", saa7146_num);
399
400 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));
401 dev->ext = ext;
402
403 pci_set_drvdata(pci, dev);
404
afd1a0c9 405 init_MUTEX(&dev->lock);
1da177e4
LT		 406 spin_lock_init(&dev->int_slock);
407 spin_lock_init(&dev->slock);
408
409 init_MUTEX(&dev->i2c_lock);
410
411 dev->module = THIS_MODULE;
412 init_waitqueue_head(&dev->i2c_wq);
413
414 /* set some sane pci arbitrition values */
415 saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
416
417 /* TODO: use the status code of the callback */
418
419 err = -ENODEV;
420
421 if (ext->probe && ext->probe(dev)) {
422 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
423 goto err_free_i2c;
424 }
425
426 if (ext->attach(dev, pci_ext)) {
427 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
428 goto err_unprobe;
429 }
430
431 INIT_LIST_HEAD(&dev->item);
432 list_add_tail(&dev->item,&saa7146_devices);
433 saa7146_num++;
434
435 err = 0;
436out:
437 return err;
438
439err_unprobe:
440 pci_set_drvdata(pci, NULL);
441err_free_i2c:
442 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
443 dev->d_i2c.dma_handle);
444err_free_rps1:
445 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
446 dev->d_rps1.dma_handle);
447err_free_rps0:
448 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
449 dev->d_rps0.dma_handle);
450err_free_irq:
451 free_irq(pci->irq, (void *)dev);
452err_unmap:
453 iounmap(dev->mem);
454err_release:
455 pci_release_region(pci, 0);
456err_disable:
457 pci_disable_device(pci);
458err_free:
459 kfree(dev);
460 goto out;
461}
462
463static void saa7146_remove_one(struct pci_dev *pdev)
464{
465 struct saa7146_dev* dev = pci_get_drvdata(pdev);
466 struct {
467 void *addr;
468 dma_addr_t dma;
469 } dev_map[] = {
470 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
471 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
472 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
473 { NULL, 0 }
474 }, *p;
475
476 DEB_EE(("dev:%p\n",dev));
477
478 dev->ext->detach(dev);
479
480 /* shut down all video dma transfers */
481 saa7146_write(dev, MC1, 0x00ff0000);
482
483 /* disable all irqs, release irq-routine */
484 saa7146_write(dev, IER, 0);
485
486 free_irq(pdev->irq, dev);
487
488 for (p = dev_map; p->addr; p++)
489 pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
490
491 iounmap(dev->mem);
492 pci_release_region(pdev, 0);
493 list_del(&dev->item);
494 pci_disable_device(pdev);
495 kfree(dev);
496
497 saa7146_num--;
498}
499
500/*********************************************************************************/
501/* extension handling functions */
502
503int saa7146_register_extension(struct saa7146_extension* ext)
504{
505 DEB_EE(("ext:%p\n",ext));
506
507 ext->driver.name = ext->name;
508 ext->driver.id_table = ext->pci_tbl;
509 ext->driver.probe = saa7146_init_one;
510 ext->driver.remove = saa7146_remove_one;
511
512 printk("saa7146: register extension '%s'.\n",ext->name);
178c6efc 513 return pci_register_driver(&ext->driver);
1da177e4
LT		 514}
515
516int saa7146_unregister_extension(struct saa7146_extension* ext)
517{
518 DEB_EE(("ext:%p\n",ext));
519 printk("saa7146: unregister extension '%s'.\n",ext->name);
520 pci_unregister_driver(&ext->driver);
521 return 0;
522}
523
524EXPORT_SYMBOL_GPL(saa7146_register_extension);
525EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
526
527/* misc functions used by extension modules */
528EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
529EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
530EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
531EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
532EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
533
534EXPORT_SYMBOL_GPL(saa7146_setgpio);
535
536EXPORT_SYMBOL_GPL(saa7146_i2c_transfer);
537EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
538
539EXPORT_SYMBOL_GPL(saa7146_debug);
540EXPORT_SYMBOL_GPL(saa7146_devices);
541EXPORT_SYMBOL_GPL(saa7146_devices_lock);
542
543MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
544MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
545MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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