2 saa7146.o - driver for generic saa7146-based hardware
4 Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
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.
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.
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.
21 #include <media/saa7146.h>
23 LIST_HEAD(saa7146_devices
);
24 DEFINE_MUTEX(saa7146_devices_lock
);
26 static int saa7146_num
;
28 unsigned int saa7146_debug
;
30 module_param(saa7146_debug
, uint
, 0644);
31 MODULE_PARM_DESC(saa7146_debug
, "debug level (default: 0)");
34 static void dump_registers(struct saa7146_dev
* dev
)
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
));
45 /****************************************************************************
46 * gpio and debi helper functions
47 ****************************************************************************/
49 void saa7146_setgpio(struct saa7146_dev
*dev
, int port
, u32 data
)
55 value
= saa7146_read(dev
, GPIO_CTRL
);
56 value
&= ~(0xff << (8*port
));
57 value
|= (data
<< (8*port
));
58 saa7146_write(dev
, GPIO_CTRL
, value
);
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
)
67 /* wait for registers to be programmed */
70 err
= time_after(jiffies
, start
+ HZ
/20);
71 if (saa7146_read(dev
, MC2
) & 2)
74 DEB_S(("timed out while waiting for registers getting programmed\n"));
81 /* wait for transfer to complete */
84 err
= time_after(jiffies
, start
+ HZ
/4);
85 if (!(saa7146_read(dev
, PSR
) & SPCI_DEBI_S
))
87 saa7146_read(dev
, MC2
);
89 DEB_S(("timed out while waiting for transfer completion\n"));
99 /****************************************************************************
100 * general helper functions
101 ****************************************************************************/
103 /* this is videobuf_vmalloc_to_sg() from videobuf-dma-sg.c
104 make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
105 may be triggered on highmem machines */
106 static struct scatterlist
* vmalloc_to_sg(unsigned char *virt
, int nr_pages
)
108 struct scatterlist
*sglist
;
112 sglist
= kcalloc(nr_pages
, sizeof(struct scatterlist
), GFP_KERNEL
);
115 sg_init_table(sglist
, nr_pages
);
116 for (i
= 0; i
< nr_pages
; i
++, virt
+= PAGE_SIZE
) {
117 pg
= vmalloc_to_page(virt
);
120 BUG_ON(PageHighMem(pg
));
121 sg_set_page(&sglist
[i
], pg
);
122 sglist
[i
].length
= PAGE_SIZE
;
131 /********************************************************************************/
132 /* common page table functions */
134 void *saa7146_vmalloc_build_pgtable(struct pci_dev
*pci
, long length
, struct saa7146_pgtable
*pt
)
136 int pages
= (length
+PAGE_SIZE
-1)/PAGE_SIZE
;
137 void *mem
= vmalloc_32(length
);
143 if (!(pt
->slist
= vmalloc_to_sg(mem
, pages
)))
146 if (saa7146_pgtable_alloc(pci
, pt
))
150 slen
= pci_map_sg(pci
,pt
->slist
,pt
->nents
,PCI_DMA_FROMDEVICE
);
152 goto err_free_pgtable
;
154 if (0 != saa7146_pgtable_build_single(pci
, pt
, pt
->slist
, slen
))
160 pci_unmap_sg(pci
, pt
->slist
, pt
->nents
, PCI_DMA_FROMDEVICE
);
162 saa7146_pgtable_free(pci
, pt
);
172 void saa7146_vfree_destroy_pgtable(struct pci_dev
*pci
, void *mem
, struct saa7146_pgtable
*pt
)
174 pci_unmap_sg(pci
, pt
->slist
, pt
->nents
, PCI_DMA_FROMDEVICE
);
175 saa7146_pgtable_free(pci
, pt
);
181 void saa7146_pgtable_free(struct pci_dev
*pci
, struct saa7146_pgtable
*pt
)
185 pci_free_consistent(pci
, pt
->size
, pt
->cpu
, pt
->dma
);
189 int saa7146_pgtable_alloc(struct pci_dev
*pci
, struct saa7146_pgtable
*pt
)
194 cpu
= pci_alloc_consistent(pci
, PAGE_SIZE
, &dma_addr
);
198 pt
->size
= PAGE_SIZE
;
205 int saa7146_pgtable_build_single(struct pci_dev
*pci
, struct saa7146_pgtable
*pt
,
206 struct scatterlist
*list
, int sglen
)
213 BUG_ON(list
->offset
> PAGE_SIZE
);
215 /* if we have a user buffer, the first page may not be
216 aligned to a page boundary. */
217 pt
->offset
= list
->offset
;
220 for (i
= 0; i
< sglen
; i
++, list
++) {
222 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
224 for (p
= 0; p
* 4096 < list
->length
; p
++, ptr
++) {
225 *ptr
= cpu_to_le32(sg_dma_address(list
) + p
* 4096);
231 /* safety; fill the page table up with the last valid page */
233 for(i
=nr_pages
;i
<1024;i
++) {
239 printk("offset: %d\n",pt->offset);
241 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
247 /********************************************************************************/
248 /* interrupt handler */
249 static irqreturn_t
interrupt_hw(int irq
, void *dev_id
)
251 struct saa7146_dev
*dev
= dev_id
;
255 /* read out the interrupt status register */
256 ack_isr
= isr
= saa7146_read(dev
, ISR
);
258 /* is this our interrupt? */
260 /* nope, some other device */
264 if( 0 != (dev
->ext
)) {
265 if( 0 != (dev
->ext
->irq_mask
& isr
)) {
266 if( 0 != dev
->ext
->irq_func
) {
267 dev
->ext
->irq_func(dev
, &isr
);
269 isr
&= ~dev
->ext
->irq_mask
;
272 if (0 != (isr
& (MASK_27
))) {
273 DEB_INT(("irq: RPS0 (0x%08x).\n",isr
));
274 if( 0 != dev
->vv_data
&& 0 != dev
->vv_callback
) {
275 dev
->vv_callback(dev
,isr
);
279 if (0 != (isr
& (MASK_28
))) {
280 if( 0 != dev
->vv_data
&& 0 != dev
->vv_callback
) {
281 dev
->vv_callback(dev
,isr
);
285 if (0 != (isr
& (MASK_16
|MASK_17
))) {
286 SAA7146_IER_DISABLE(dev
, MASK_16
|MASK_17
);
287 /* only wake up if we expect something */
288 if (0 != dev
->i2c_op
) {
290 wake_up(&dev
->i2c_wq
);
292 u32 psr
= saa7146_read(dev
, PSR
);
293 u32 ssr
= saa7146_read(dev
, SSR
);
294 printk(KERN_WARNING
"%s: unexpected i2c irq: isr %08x psr %08x ssr %08x\n",
295 dev
->name
, isr
, psr
, ssr
);
297 isr
&= ~(MASK_16
|MASK_17
);
300 ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr
));
301 ERR(("disabling interrupt source(s)!\n"));
302 SAA7146_IER_DISABLE(dev
,isr
);
304 saa7146_write(dev
, ISR
, ack_isr
);
308 /*********************************************************************************/
309 /* configuration-functions */
311 static int saa7146_init_one(struct pci_dev
*pci
, const struct pci_device_id
*ent
)
313 struct saa7146_pci_extension_data
*pci_ext
= (struct saa7146_pci_extension_data
*)ent
->driver_data
;
314 struct saa7146_extension
*ext
= pci_ext
->ext
;
315 struct saa7146_dev
*dev
;
318 /* clear out mem for sure */
319 dev
= kzalloc(sizeof(struct saa7146_dev
), GFP_KERNEL
);
321 ERR(("out of memory.\n"));
325 DEB_EE(("pci:%p\n",pci
));
327 err
= pci_enable_device(pci
);
329 ERR(("pci_enable_device() failed.\n"));
333 /* enable bus-mastering */
338 /* get chip-revision; this is needed to enable bug-fixes */
339 err
= pci_read_config_dword(pci
, PCI_CLASS_REVISION
, &dev
->revision
);
341 ERR(("pci_read_config_dword() failed.\n"));
344 dev
->revision
&= 0xf;
346 /* remap the memory from virtual to physical adress */
348 err
= pci_request_region(pci
, 0, "saa7146");
352 dev
->mem
= ioremap(pci_resource_start(pci
, 0),
353 pci_resource_len(pci
, 0));
355 ERR(("ioremap() failed.\n"));
360 /* we don't do a master reset here anymore, it screws up
361 some boards that don't have an i2c-eeprom for configuration
364 saa7146_write(dev, MC1, MASK_31);
367 /* disable all irqs */
368 saa7146_write(dev
, IER
, 0);
370 /* shut down all dma transfers and rps tasks */
371 saa7146_write(dev
, MC1
, 0x30ff0000);
373 /* clear out any rps-signals pending */
374 saa7146_write(dev
, MC2
, 0xf8000000);
376 /* request an interrupt for the saa7146 */
377 err
= request_irq(pci
->irq
, interrupt_hw
, IRQF_SHARED
| IRQF_DISABLED
,
380 ERR(("request_irq() failed.\n"));
386 /* get memory for various stuff */
387 dev
->d_rps0
.cpu_addr
= pci_alloc_consistent(pci
, SAA7146_RPS_MEM
,
388 &dev
->d_rps0
.dma_handle
);
389 if (!dev
->d_rps0
.cpu_addr
)
391 memset(dev
->d_rps0
.cpu_addr
, 0x0, SAA7146_RPS_MEM
);
393 dev
->d_rps1
.cpu_addr
= pci_alloc_consistent(pci
, SAA7146_RPS_MEM
,
394 &dev
->d_rps1
.dma_handle
);
395 if (!dev
->d_rps1
.cpu_addr
)
397 memset(dev
->d_rps1
.cpu_addr
, 0x0, SAA7146_RPS_MEM
);
399 dev
->d_i2c
.cpu_addr
= pci_alloc_consistent(pci
, SAA7146_RPS_MEM
,
400 &dev
->d_i2c
.dma_handle
);
401 if (!dev
->d_i2c
.cpu_addr
)
403 memset(dev
->d_i2c
.cpu_addr
, 0x0, SAA7146_RPS_MEM
);
405 /* the rest + print status message */
407 /* create a nice device name */
408 sprintf(dev
->name
, "saa7146 (%d)", saa7146_num
);
410 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
));
413 pci_set_drvdata(pci
, dev
);
415 mutex_init(&dev
->lock
);
416 spin_lock_init(&dev
->int_slock
);
417 spin_lock_init(&dev
->slock
);
419 mutex_init(&dev
->i2c_lock
);
421 dev
->module
= THIS_MODULE
;
422 init_waitqueue_head(&dev
->i2c_wq
);
424 /* set some sane pci arbitrition values */
425 saa7146_write(dev
, PCI_BT_V1
, 0x1c00101f);
427 /* TODO: use the status code of the callback */
431 if (ext
->probe
&& ext
->probe(dev
)) {
432 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev
));
436 if (ext
->attach(dev
, pci_ext
)) {
437 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev
));
441 INIT_LIST_HEAD(&dev
->item
);
442 list_add_tail(&dev
->item
,&saa7146_devices
);
450 pci_set_drvdata(pci
, NULL
);
452 pci_free_consistent(pci
, SAA7146_RPS_MEM
, dev
->d_i2c
.cpu_addr
,
453 dev
->d_i2c
.dma_handle
);
455 pci_free_consistent(pci
, SAA7146_RPS_MEM
, dev
->d_rps1
.cpu_addr
,
456 dev
->d_rps1
.dma_handle
);
458 pci_free_consistent(pci
, SAA7146_RPS_MEM
, dev
->d_rps0
.cpu_addr
,
459 dev
->d_rps0
.dma_handle
);
461 free_irq(pci
->irq
, (void *)dev
);
465 pci_release_region(pci
, 0);
467 pci_disable_device(pci
);
473 static void saa7146_remove_one(struct pci_dev
*pdev
)
475 struct saa7146_dev
* dev
= pci_get_drvdata(pdev
);
480 { dev
->d_i2c
.cpu_addr
, dev
->d_i2c
.dma_handle
},
481 { dev
->d_rps1
.cpu_addr
, dev
->d_rps1
.dma_handle
},
482 { dev
->d_rps0
.cpu_addr
, dev
->d_rps0
.dma_handle
},
486 DEB_EE(("dev:%p\n",dev
));
488 dev
->ext
->detach(dev
);
490 /* shut down all video dma transfers */
491 saa7146_write(dev
, MC1
, 0x00ff0000);
493 /* disable all irqs, release irq-routine */
494 saa7146_write(dev
, IER
, 0);
496 free_irq(pdev
->irq
, dev
);
498 for (p
= dev_map
; p
->addr
; p
++)
499 pci_free_consistent(pdev
, SAA7146_RPS_MEM
, p
->addr
, p
->dma
);
502 pci_release_region(pdev
, 0);
503 list_del(&dev
->item
);
504 pci_disable_device(pdev
);
510 /*********************************************************************************/
511 /* extension handling functions */
513 int saa7146_register_extension(struct saa7146_extension
* ext
)
515 DEB_EE(("ext:%p\n",ext
));
517 ext
->driver
.name
= ext
->name
;
518 ext
->driver
.id_table
= ext
->pci_tbl
;
519 ext
->driver
.probe
= saa7146_init_one
;
520 ext
->driver
.remove
= saa7146_remove_one
;
522 printk("saa7146: register extension '%s'.\n",ext
->name
);
523 return pci_register_driver(&ext
->driver
);
526 int saa7146_unregister_extension(struct saa7146_extension
* ext
)
528 DEB_EE(("ext:%p\n",ext
));
529 printk("saa7146: unregister extension '%s'.\n",ext
->name
);
530 pci_unregister_driver(&ext
->driver
);
534 EXPORT_SYMBOL_GPL(saa7146_register_extension
);
535 EXPORT_SYMBOL_GPL(saa7146_unregister_extension
);
537 /* misc functions used by extension modules */
538 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc
);
539 EXPORT_SYMBOL_GPL(saa7146_pgtable_free
);
540 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single
);
541 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable
);
542 EXPORT_SYMBOL_GPL(saa7146_vfree_destroy_pgtable
);
543 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done
);
545 EXPORT_SYMBOL_GPL(saa7146_setgpio
);
547 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare
);
549 EXPORT_SYMBOL_GPL(saa7146_debug
);
550 EXPORT_SYMBOL_GPL(saa7146_devices
);
551 EXPORT_SYMBOL_GPL(saa7146_devices_lock
);
553 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
554 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
555 MODULE_LICENSE("GPL");