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 /* global variables */
24 struct list_head saa7146_devices
;
25 struct semaphore saa7146_devices_lock
;
27 static int initialized
= 0;
30 unsigned int saa7146_debug
= 0;
32 MODULE_PARM(saa7146_debug
,"i");
33 MODULE_PARM_DESC(saa7146_debug
, "debug level (default: 0)");
36 static void dump_registers(struct saa7146_dev
* dev
)
40 INFO((" @ %li jiffies:\n",jiffies
));
41 for(i
= 0; i
<= 0x148; i
+=4) {
42 printk("0x%03x: 0x%08x\n",i
,saa7146_read(dev
,i
));
47 /****************************************************************************
48 * gpio and debi helper functions
49 ****************************************************************************/
51 /* write "data" to the gpio-pin "pin" */
52 void saa7146_set_gpio(struct saa7146_dev
*dev
, u8 pin
, u8 data
)
60 /* read old register contents */
61 value
= saa7146_read(dev
, GPIO_CTRL
);
63 value
&= ~(0xff << (8*pin
));
64 value
|= (data
<< (8*pin
));
66 saa7146_write(dev
, GPIO_CTRL
, value
);
69 /* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
70 int saa7146_wait_for_debi_done(struct saa7146_dev
*dev
)
74 /* wait for registers to be programmed */
77 if (saa7146_read(dev
, MC2
) & 2)
79 if (time_after(jiffies
, start
+ HZ
/20)) {
80 DEB_S(("timed out while waiting for registers getting programmed\n"));
85 /* wait for transfer to complete */
88 if (!(saa7146_read(dev
, PSR
) & SPCI_DEBI_S
))
90 saa7146_read(dev
, MC2
);
91 if (time_after(jiffies
, start
+ HZ
/4)) {
92 DEB_S(("timed out while waiting for transfer completion\n"));
100 /****************************************************************************
101 * general helper functions
102 ****************************************************************************/
104 /* this is videobuf_vmalloc_to_sg() from video-buf.c
105 make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
106 may be triggered on highmem machines */
107 static struct scatterlist
* vmalloc_to_sg(unsigned char *virt
, int nr_pages
)
109 struct scatterlist
*sglist
;
113 sglist
= kmalloc(sizeof(struct scatterlist
)*nr_pages
, GFP_KERNEL
);
116 memset(sglist
,0,sizeof(struct scatterlist
)*nr_pages
);
117 for (i
= 0; i
< nr_pages
; i
++, virt
+= PAGE_SIZE
) {
118 pg
= vmalloc_to_page(virt
);
124 sglist
[i
].length
= PAGE_SIZE
;
133 /********************************************************************************/
134 /* common page table functions */
136 #define SAA7146_PGTABLE_SIZE 4096
138 char *saa7146_vmalloc_build_pgtable(struct pci_dev
*pci
, long length
, struct saa7146_pgtable
*pt
)
140 int pages
= (length
+PAGE_SIZE
-1)/PAGE_SIZE
;
141 char *mem
= vmalloc_32(length
);
148 if (!(pt
->slist
= vmalloc_to_sg(mem
, pages
))) {
153 if (saa7146_pgtable_alloc(pci
, pt
)) {
160 slen
= pci_map_sg(pci
,pt
->slist
,pages
,PCI_DMA_FROMDEVICE
);
161 if (0 != saa7146_pgtable_build_single(pci
, pt
, pt
->slist
, slen
)) {
168 void saa7146_pgtable_free(struct pci_dev
*pci
, struct saa7146_pgtable
*pt
)
172 pci_free_consistent(pci
, pt
->size
, pt
->cpu
, pt
->dma
);
174 if (NULL
!= pt
->slist
) {
180 int saa7146_pgtable_alloc(struct pci_dev
*pci
, struct saa7146_pgtable
*pt
)
185 cpu
= pci_alloc_consistent(pci
, SAA7146_PGTABLE_SIZE
, &dma_addr
);
189 pt
->size
= SAA7146_PGTABLE_SIZE
;
196 int saa7146_pgtable_build_single(struct pci_dev
*pci
, struct saa7146_pgtable
*pt
,
197 struct scatterlist
*list
, int sglen
)
205 if (list
->offset
> PAGE_SIZE
) {
206 DEB_D(("offset > PAGE_SIZE. this should not happen."));
210 /* if we have a user buffer, the first page may not be
211 aligned to a page boundary. */
212 pt
->offset
= list
->offset
;
215 for (i
= 0; i
< sglen
; i
++, list
++) {
217 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
219 for (p
= 0; p
* 4096 < list
->length
; p
++, ptr
++) {
220 *ptr
= sg_dma_address(list
) + p
* 4096;
226 /* safety; fill the page table up with the last valid page */
228 for(i
=nr_pages
;i
<1024;i
++) {
234 printk("offset: %d\n",pt->offset);
236 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
242 /********************************************************************************/
245 void saa7146_setgpio(struct saa7146_dev
*dev
, int port
, u32 data
)
249 val
=saa7146_read(dev
,GPIO_CTRL
);
250 val
&=~(0xff << (8*(port
)));
251 val
|=(data
)<<(8*(port
));
252 saa7146_write(dev
, GPIO_CTRL
, val
);
255 /********************************************************************************/
256 /* interrupt handler */
258 static irqreturn_t
interrupt_hw(int irq
, void *dev_id
, struct pt_regs
*regs
)
260 struct saa7146_dev
*dev
= (struct saa7146_dev
*)dev_id
;
263 /* read out the interrupt status register */
264 isr
= saa7146_read(dev
, ISR
);
266 /* is this our interrupt? */
268 /* nope, some other device */
272 saa7146_write(dev
, ISR
, isr
);
274 if( 0 != (dev
->ext
)) {
275 if( 0 != (dev
->ext
->irq_mask
& isr
)) {
276 if( 0 != dev
->ext
->irq_func
) {
277 dev
->ext
->irq_func(dev
, &isr
);
279 isr
&= ~dev
->ext
->irq_mask
;
282 if (0 != (isr
& (MASK_27
))) {
283 DEB_INT(("irq: RPS0 (0x%08x).\n",isr
));
284 if( 0 != dev
->vv_data
&& 0 != dev
->vv_callback
) {
285 dev
->vv_callback(dev
,isr
);
289 if (0 != (isr
& (MASK_28
))) {
290 if( 0 != dev
->vv_data
&& 0 != dev
->vv_callback
) {
291 dev
->vv_callback(dev
,isr
);
295 if (0 != (isr
& (MASK_16
|MASK_17
))) {
296 u32 status
= saa7146_read(dev
, I2C_STATUS
);
297 if( (0x3 == (status
& 0x3)) || (0 == (status
& 0x1)) ) {
298 IER_DISABLE(dev
, MASK_16
|MASK_17
);
299 /* only wake up if we expect something */
300 if( 0 != dev
->i2c_op
) {
301 u32 psr
= (saa7146_read(dev
, PSR
) >> 16) & 0x2;
302 u32 ssr
= (saa7146_read(dev
, SSR
) >> 17) & 0x1f;
303 DEB_I2C(("irq: i2c, status: 0x%08x, psr:0x%02x, ssr:0x%02x).\n",status
,psr
,ssr
));
305 wake_up(&dev
->i2c_wq
);
307 DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status
, isr
));
310 DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status
, isr
));
312 isr
&= ~(MASK_16
|MASK_17
);
315 ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr
));
316 ERR(("disabling interrupt source(s)!\n"));
317 IER_DISABLE(dev
,isr
);
322 /*********************************************************************************/
323 /* configuration-functions */
325 static int saa7146_init_one(struct pci_dev
*pci
, const struct pci_device_id
*ent
)
327 unsigned long adr
= 0, len
= 0;
328 struct saa7146_dev
* dev
= kmalloc (sizeof(struct saa7146_dev
),GFP_KERNEL
);
330 struct saa7146_pci_extension_data
*pci_ext
= (struct saa7146_pci_extension_data
*)ent
->driver_data
;
331 struct saa7146_extension
* ext
= pci_ext
->ext
;
334 if (!(dev
= kmalloc (sizeof(struct saa7146_dev
),GFP_KERNEL
))) {
335 ERR(("out of memory.\n"));
339 /* clear out mem for sure */
340 memset(dev
, 0x0, sizeof(struct saa7146_dev
));
342 DEB_EE(("pci:%p\n",pci
));
344 if (pci_enable_device(pci
)) {
345 ERR(("pci_enable_device() failed.\n"));
350 /* enable bus-mastering */
354 /* get chip-revision; this is needed to enable bug-fixes */
355 if( 0 > pci_read_config_dword(dev
->pci
, PCI_CLASS_REVISION
, &dev
->revision
)) {
356 ERR(("pci_read_config_dword() failed.\n"));
360 dev
->revision
&= 0xf;
362 /* remap the memory from virtual to physical adress */
363 adr
= pci_resource_start(pci
,0);
364 len
= pci_resource_len(pci
,0);
366 if (!request_mem_region(pci_resource_start(pci
,0), pci_resource_len(pci
,0), "saa7146")) {
367 ERR(("request_mem_region() failed.\n"));
372 if (!(dev
->mem
= ioremap(adr
,len
))) {
373 ERR(("ioremap() failed.\n"));
378 /* we don't do a master reset here anymore, it screws up
379 some boards that don't have an i2c-eeprom for configuration
382 saa7146_write(dev, MC1, MASK_31);
385 /* disable all irqs */
386 saa7146_write(dev
, IER
, 0);
388 /* shut down all dma transfers */
389 saa7146_write(dev
, MC1
, 0x00ff0000);
391 /* clear out any rps-signals pending */
392 saa7146_write(dev
, MC2
, 0xf8000000);
394 /* request an interrupt for the saa7146 */
395 if (request_irq(dev
->pci
->irq
, interrupt_hw
, SA_SHIRQ
| SA_INTERRUPT
,
398 ERR(("request_irq() failed.\n"));
403 /* get memory for various stuff */
404 dev
->d_rps0
.cpu_addr
= pci_alloc_consistent(dev
->pci
, SAA7146_RPS_MEM
, &dev
->d_rps0
.dma_handle
);
405 if( NULL
== dev
->d_rps0
.cpu_addr
) {
407 goto kmalloc_error_1
;
409 memset(dev
->d_rps0
.cpu_addr
, 0x0, SAA7146_RPS_MEM
);
411 dev
->d_rps1
.cpu_addr
= pci_alloc_consistent(dev
->pci
, SAA7146_RPS_MEM
, &dev
->d_rps1
.dma_handle
);
412 if( NULL
== dev
->d_rps1
.cpu_addr
) {
414 goto kmalloc_error_2
;
416 memset(dev
->d_rps1
.cpu_addr
, 0x0, SAA7146_RPS_MEM
);
418 dev
->d_i2c
.cpu_addr
= pci_alloc_consistent(dev
->pci
, SAA7146_RPS_MEM
, &dev
->d_i2c
.dma_handle
);
419 if( NULL
== dev
->d_i2c
.cpu_addr
) {
421 goto kmalloc_error_3
;
423 memset(dev
->d_i2c
.cpu_addr
, 0x0, SAA7146_RPS_MEM
);
425 /* the rest + print status message */
427 /* create a nice device name */
428 sprintf(&dev
->name
[0], "saa7146 (%d)",saa7146_num
);
430 INFO(("found saa7146 @ mem %p (revision %d, irq %d) (0x%04x,0x%04x).\n", dev
->mem
, dev
->revision
,dev
->pci
->irq
,dev
->pci
->subsystem_vendor
,dev
->pci
->subsystem_device
));
433 pci_set_drvdata(pci
,dev
);
435 init_MUTEX(&dev
->lock
);
436 dev
->int_slock
= SPIN_LOCK_UNLOCKED
;
437 dev
->slock
= SPIN_LOCK_UNLOCKED
;
439 init_MUTEX(&dev
->i2c_lock
);
441 dev
->module
= THIS_MODULE
;
442 init_waitqueue_head(&dev
->i2c_wq
);
444 /* set some sane pci arbitrition values */
445 saa7146_write(dev
, PCI_BT_V1
, 0x1c00101f);
447 if( 0 != ext
->probe
) {
448 if( 0 != ext
->probe(dev
) ) {
449 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev
));
455 if( 0 != ext
->attach(dev
,pci_ext
) ) {
456 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev
));
461 INIT_LIST_HEAD(&dev
->item
);
462 list_add_tail(&dev
->item
,&saa7146_devices
);
469 pci_set_drvdata(pci
,NULL
);
470 pci_free_consistent(dev
->pci
, SAA7146_RPS_MEM
, dev
->d_i2c
.cpu_addr
, dev
->d_i2c
.dma_handle
);
472 pci_free_consistent(dev
->pci
, SAA7146_RPS_MEM
, dev
->d_rps1
.cpu_addr
, dev
->d_rps1
.dma_handle
);
474 pci_free_consistent(dev
->pci
, SAA7146_RPS_MEM
, dev
->d_rps0
.cpu_addr
, dev
->d_rps0
.dma_handle
);
476 free_irq(dev
->pci
->irq
, (void *)dev
);
480 release_mem_region(adr
,len
);
487 static void saa7146_remove_one(struct pci_dev
*pdev
)
489 struct saa7146_dev
* dev
= (struct saa7146_dev
*) pci_get_drvdata(pdev
);
490 DEB_EE(("dev:%p\n",dev
));
492 dev
->ext
->detach(dev
);
494 /* shut down all video dma transfers */
495 saa7146_write(dev
, MC1
, 0x00ff0000);
497 /* disable all irqs, release irq-routine */
498 saa7146_write(dev
, IER
, 0);
500 free_irq(dev
->pci
->irq
, (void *)dev
);
502 /* free kernel memory */
503 pci_free_consistent(dev
->pci
, SAA7146_RPS_MEM
, dev
->d_i2c
.cpu_addr
, dev
->d_i2c
.dma_handle
);
504 pci_free_consistent(dev
->pci
, SAA7146_RPS_MEM
, dev
->d_rps1
.cpu_addr
, dev
->d_rps1
.dma_handle
);
505 pci_free_consistent(dev
->pci
, SAA7146_RPS_MEM
, dev
->d_rps0
.cpu_addr
, dev
->d_rps0
.dma_handle
);
508 release_mem_region(pci_resource_start(dev
->pci
,0), pci_resource_len(dev
->pci
,0));
510 list_del(&dev
->item
);
516 /*********************************************************************************/
517 /* extension handling functions */
519 int saa7146_register_extension(struct saa7146_extension
* ext
)
521 DEB_EE(("ext:%p\n",ext
));
523 if( 0 == initialized
) {
524 INIT_LIST_HEAD(&saa7146_devices
);
525 init_MUTEX(&saa7146_devices_lock
);
529 ext
->driver
.name
= ext
->name
;
530 ext
->driver
.id_table
= ext
->pci_tbl
;
531 ext
->driver
.probe
= saa7146_init_one
;
532 ext
->driver
.remove
= saa7146_remove_one
;
534 printk("saa7146: register extension '%s'.\n",ext
->name
);
535 return pci_module_init(&ext
->driver
);
538 int saa7146_unregister_extension(struct saa7146_extension
* ext
)
540 DEB_EE(("ext:%p\n",ext
));
541 printk("saa7146: unregister extension '%s'.\n",ext
->name
);
542 pci_unregister_driver(&ext
->driver
);
546 static int __init
saa7146_init_module(void)
548 if( 0 == initialized
) {
549 INIT_LIST_HEAD(&saa7146_devices
);
550 init_MUTEX(&saa7146_devices_lock
);
556 static void __exit
saa7146_cleanup_module(void)
560 module_init(saa7146_init_module
);
561 module_exit(saa7146_cleanup_module
);
563 EXPORT_SYMBOL_GPL(saa7146_register_extension
);
564 EXPORT_SYMBOL_GPL(saa7146_unregister_extension
);
566 /* misc functions used by extension modules */
567 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc
);
568 EXPORT_SYMBOL_GPL(saa7146_pgtable_free
);
569 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single
);
570 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable
);
571 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done
);
573 EXPORT_SYMBOL_GPL(saa7146_setgpio
);
575 EXPORT_SYMBOL_GPL(saa7146_i2c_transfer
);
576 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare
);
578 EXPORT_SYMBOL_GPL(saa7146_debug
);
579 EXPORT_SYMBOL_GPL(saa7146_devices
);
580 EXPORT_SYMBOL_GPL(saa7146_devices_lock
);
582 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
583 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
584 MODULE_LICENSE("GPL");