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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 | ||
23 | LIST_HEAD(saa7146_devices); | |
24 | DECLARE_MUTEX(saa7146_devices_lock); | |
25 | ||
c2c62d81 | 26 | static int saa7146_num; |
1da177e4 | 27 | |
c2c62d81 | 28 | unsigned int saa7146_debug; |
1da177e4 LT |
29 | |
30 | module_param(saa7146_debug, int, 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 | int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop) | |
63 | { | |
64 | unsigned long start; | |
65 | ||
66 | /* wait for registers to be programmed */ | |
67 | start = jiffies; | |
68 | while (1) { | |
69 | if (saa7146_read(dev, MC2) & 2) | |
70 | break; | |
71 | if (time_after(jiffies, start + HZ/20)) { | |
72 | DEB_S(("timed out while waiting for registers getting programmed\n")); | |
73 | return -ETIMEDOUT; | |
74 | } | |
75 | if (nobusyloop) | |
76 | msleep(1); | |
77 | } | |
78 | ||
79 | /* wait for transfer to complete */ | |
80 | start = jiffies; | |
81 | while (1) { | |
82 | if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S)) | |
83 | break; | |
84 | saa7146_read(dev, MC2); | |
85 | if (time_after(jiffies, start + HZ/4)) { | |
86 | DEB_S(("timed out while waiting for transfer completion\n")); | |
87 | return -ETIMEDOUT; | |
88 | } | |
89 | if (nobusyloop) | |
90 | msleep(1); | |
91 | } | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | /**************************************************************************** | |
97 | * general helper functions | |
98 | ****************************************************************************/ | |
99 | ||
100 | /* this is videobuf_vmalloc_to_sg() from video-buf.c | |
101 | make sure virt has been allocated with vmalloc_32(), otherwise the BUG() | |
102 | may be triggered on highmem machines */ | |
103 | static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages) | |
104 | { | |
105 | struct scatterlist *sglist; | |
106 | struct page *pg; | |
107 | int i; | |
108 | ||
109 | sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL); | |
110 | if (NULL == sglist) | |
111 | return NULL; | |
112 | memset(sglist,0,sizeof(struct scatterlist)*nr_pages); | |
113 | for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) { | |
114 | pg = vmalloc_to_page(virt); | |
115 | if (NULL == pg) | |
116 | goto err; | |
117 | if (PageHighMem(pg)) | |
118 | BUG(); | |
119 | sglist[i].page = pg; | |
120 | sglist[i].length = PAGE_SIZE; | |
121 | } | |
122 | return sglist; | |
123 | ||
124 | err: | |
125 | kfree(sglist); | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | /********************************************************************************/ | |
130 | /* common page table functions */ | |
131 | ||
132 | char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt) | |
133 | { | |
134 | int pages = (length+PAGE_SIZE-1)/PAGE_SIZE; | |
135 | char *mem = vmalloc_32(length); | |
136 | int slen = 0; | |
137 | ||
138 | if (NULL == mem) { | |
139 | return NULL; | |
140 | } | |
141 | ||
142 | if (!(pt->slist = vmalloc_to_sg(mem, pages))) { | |
143 | vfree(mem); | |
144 | return NULL; | |
145 | } | |
146 | ||
147 | if (saa7146_pgtable_alloc(pci, pt)) { | |
148 | kfree(pt->slist); | |
149 | pt->slist = NULL; | |
150 | vfree(mem); | |
151 | return NULL; | |
152 | } | |
153 | ||
154 | slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE); | |
155 | if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) { | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | return mem; | |
160 | } | |
161 | ||
162 | void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt) | |
163 | { | |
164 | if (NULL == pt->cpu) | |
165 | return; | |
166 | pci_free_consistent(pci, pt->size, pt->cpu, pt->dma); | |
167 | pt->cpu = NULL; | |
168 | if (NULL != pt->slist) { | |
169 | kfree(pt->slist); | |
170 | pt->slist = NULL; | |
171 | } | |
172 | } | |
173 | ||
174 | int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt) | |
175 | { | |
176 | u32 *cpu; | |
177 | dma_addr_t dma_addr; | |
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 | ||
190 | int 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 */ | |
234 | static 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 | ||
301 | static 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 | ||
308 | dev = kmalloc(sizeof(struct saa7146_dev), GFP_KERNEL); | |
309 | if (!dev) { | |
310 | ERR(("out of memory.\n")); | |
311 | goto out; | |
312 | } | |
313 | ||
314 | /* clear out mem for sure */ | |
315 | memset(dev, 0x0, sizeof(struct saa7146_dev)); | |
316 | ||
317 | DEB_EE(("pci:%p\n",pci)); | |
318 | ||
319 | err = pci_enable_device(pci); | |
320 | if (err < 0) { | |
321 | ERR(("pci_enable_device() failed.\n")); | |
322 | goto err_free; | |
323 | } | |
324 | ||
325 | /* enable bus-mastering */ | |
326 | pci_set_master(pci); | |
327 | ||
328 | dev->pci = pci; | |
329 | ||
330 | /* get chip-revision; this is needed to enable bug-fixes */ | |
331 | err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision); | |
332 | if (err < 0) { | |
333 | ERR(("pci_read_config_dword() failed.\n")); | |
334 | goto err_disable; | |
335 | } | |
336 | dev->revision &= 0xf; | |
337 | ||
338 | /* remap the memory from virtual to physical adress */ | |
339 | ||
340 | err = pci_request_region(pci, 0, "saa7146"); | |
341 | if (err < 0) | |
342 | goto err_disable; | |
343 | ||
344 | dev->mem = ioremap(pci_resource_start(pci, 0), | |
345 | pci_resource_len(pci, 0)); | |
346 | if (!dev->mem) { | |
347 | ERR(("ioremap() failed.\n")); | |
348 | err = -ENODEV; | |
349 | goto err_release; | |
350 | } | |
351 | ||
352 | /* we don't do a master reset here anymore, it screws up | |
353 | some boards that don't have an i2c-eeprom for configuration | |
354 | values */ | |
355 | /* | |
356 | saa7146_write(dev, MC1, MASK_31); | |
357 | */ | |
358 | ||
359 | /* disable all irqs */ | |
360 | saa7146_write(dev, IER, 0); | |
361 | ||
362 | /* shut down all dma transfers and rps tasks */ | |
363 | saa7146_write(dev, MC1, 0x30ff0000); | |
364 | ||
365 | /* clear out any rps-signals pending */ | |
366 | saa7146_write(dev, MC2, 0xf8000000); | |
367 | ||
368 | /* request an interrupt for the saa7146 */ | |
369 | err = request_irq(pci->irq, interrupt_hw, SA_SHIRQ | SA_INTERRUPT, | |
370 | dev->name, dev); | |
371 | if (err < 0) { | |
372 | ERR(("request_irq() failed.\n")); | |
373 | goto err_unmap; | |
374 | } | |
375 | ||
376 | err = -ENOMEM; | |
377 | ||
378 | /* get memory for various stuff */ | |
379 | dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM, | |
380 | &dev->d_rps0.dma_handle); | |
381 | if (!dev->d_rps0.cpu_addr) | |
382 | goto err_free_irq; | |
383 | memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM); | |
384 | ||
385 | dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM, | |
386 | &dev->d_rps1.dma_handle); | |
387 | if (!dev->d_rps1.cpu_addr) | |
388 | goto err_free_rps0; | |
389 | memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM); | |
390 | ||
391 | dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM, | |
392 | &dev->d_i2c.dma_handle); | |
393 | if (!dev->d_i2c.cpu_addr) | |
394 | goto err_free_rps1; | |
395 | memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM); | |
396 | ||
397 | /* the rest + print status message */ | |
398 | ||
399 | /* create a nice device name */ | |
400 | sprintf(dev->name, "saa7146 (%d)", saa7146_num); | |
401 | ||
402 | 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)); | |
403 | dev->ext = ext; | |
404 | ||
405 | pci_set_drvdata(pci, dev); | |
406 | ||
407 | init_MUTEX(&dev->lock); | |
408 | spin_lock_init(&dev->int_slock); | |
409 | spin_lock_init(&dev->slock); | |
410 | ||
411 | init_MUTEX(&dev->i2c_lock); | |
412 | ||
413 | dev->module = THIS_MODULE; | |
414 | init_waitqueue_head(&dev->i2c_wq); | |
415 | ||
416 | /* set some sane pci arbitrition values */ | |
417 | saa7146_write(dev, PCI_BT_V1, 0x1c00101f); | |
418 | ||
419 | /* TODO: use the status code of the callback */ | |
420 | ||
421 | err = -ENODEV; | |
422 | ||
423 | if (ext->probe && ext->probe(dev)) { | |
424 | DEB_D(("ext->probe() failed for %p. skipping device.\n",dev)); | |
425 | goto err_free_i2c; | |
426 | } | |
427 | ||
428 | if (ext->attach(dev, pci_ext)) { | |
429 | DEB_D(("ext->attach() failed for %p. skipping device.\n",dev)); | |
430 | goto err_unprobe; | |
431 | } | |
432 | ||
433 | INIT_LIST_HEAD(&dev->item); | |
434 | list_add_tail(&dev->item,&saa7146_devices); | |
435 | saa7146_num++; | |
436 | ||
437 | err = 0; | |
438 | out: | |
439 | return err; | |
440 | ||
441 | err_unprobe: | |
442 | pci_set_drvdata(pci, NULL); | |
443 | err_free_i2c: | |
444 | pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr, | |
445 | dev->d_i2c.dma_handle); | |
446 | err_free_rps1: | |
447 | pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr, | |
448 | dev->d_rps1.dma_handle); | |
449 | err_free_rps0: | |
450 | pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr, | |
451 | dev->d_rps0.dma_handle); | |
452 | err_free_irq: | |
453 | free_irq(pci->irq, (void *)dev); | |
454 | err_unmap: | |
455 | iounmap(dev->mem); | |
456 | err_release: | |
457 | pci_release_region(pci, 0); | |
458 | err_disable: | |
459 | pci_disable_device(pci); | |
460 | err_free: | |
461 | kfree(dev); | |
462 | goto out; | |
463 | } | |
464 | ||
465 | static void saa7146_remove_one(struct pci_dev *pdev) | |
466 | { | |
467 | struct saa7146_dev* dev = pci_get_drvdata(pdev); | |
468 | struct { | |
469 | void *addr; | |
470 | dma_addr_t dma; | |
471 | } dev_map[] = { | |
472 | { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle }, | |
473 | { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle }, | |
474 | { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle }, | |
475 | { NULL, 0 } | |
476 | }, *p; | |
477 | ||
478 | DEB_EE(("dev:%p\n",dev)); | |
479 | ||
480 | dev->ext->detach(dev); | |
481 | ||
482 | /* shut down all video dma transfers */ | |
483 | saa7146_write(dev, MC1, 0x00ff0000); | |
484 | ||
485 | /* disable all irqs, release irq-routine */ | |
486 | saa7146_write(dev, IER, 0); | |
487 | ||
488 | free_irq(pdev->irq, dev); | |
489 | ||
490 | for (p = dev_map; p->addr; p++) | |
491 | pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma); | |
492 | ||
493 | iounmap(dev->mem); | |
494 | pci_release_region(pdev, 0); | |
495 | list_del(&dev->item); | |
496 | pci_disable_device(pdev); | |
497 | kfree(dev); | |
498 | ||
499 | saa7146_num--; | |
500 | } | |
501 | ||
502 | /*********************************************************************************/ | |
503 | /* extension handling functions */ | |
504 | ||
505 | int saa7146_register_extension(struct saa7146_extension* ext) | |
506 | { | |
507 | DEB_EE(("ext:%p\n",ext)); | |
508 | ||
509 | ext->driver.name = ext->name; | |
510 | ext->driver.id_table = ext->pci_tbl; | |
511 | ext->driver.probe = saa7146_init_one; | |
512 | ext->driver.remove = saa7146_remove_one; | |
513 | ||
514 | printk("saa7146: register extension '%s'.\n",ext->name); | |
178c6efc | 515 | return pci_register_driver(&ext->driver); |
1da177e4 LT |
516 | } |
517 | ||
518 | int saa7146_unregister_extension(struct saa7146_extension* ext) | |
519 | { | |
520 | DEB_EE(("ext:%p\n",ext)); | |
521 | printk("saa7146: unregister extension '%s'.\n",ext->name); | |
522 | pci_unregister_driver(&ext->driver); | |
523 | return 0; | |
524 | } | |
525 | ||
526 | EXPORT_SYMBOL_GPL(saa7146_register_extension); | |
527 | EXPORT_SYMBOL_GPL(saa7146_unregister_extension); | |
528 | ||
529 | /* misc functions used by extension modules */ | |
530 | EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc); | |
531 | EXPORT_SYMBOL_GPL(saa7146_pgtable_free); | |
532 | EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single); | |
533 | EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable); | |
534 | EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done); | |
535 | ||
536 | EXPORT_SYMBOL_GPL(saa7146_setgpio); | |
537 | ||
538 | EXPORT_SYMBOL_GPL(saa7146_i2c_transfer); | |
539 | EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare); | |
540 | ||
541 | EXPORT_SYMBOL_GPL(saa7146_debug); | |
542 | EXPORT_SYMBOL_GPL(saa7146_devices); | |
543 | EXPORT_SYMBOL_GPL(saa7146_devices_lock); | |
544 | ||
545 | MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); | |
546 | MODULE_DESCRIPTION("driver for generic saa7146-based hardware"); | |
547 | MODULE_LICENSE("GPL"); |