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 DECLARE_MUTEX(saa7146_devices_lock
);
26 static int saa7146_num
;
28 unsigned int saa7146_debug
;
30 module_param(saa7146_debug
, int, 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 video-buf.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 for (i
= 0; i
< nr_pages
; i
++, virt
+= PAGE_SIZE
) {
116 pg
= vmalloc_to_page(virt
);
122 sglist
[i
].length
= PAGE_SIZE
;
131 /********************************************************************************/
132 /* common page table functions */
134 char *saa7146_vmalloc_build_pgtable(struct pci_dev
*pci
, long length
, struct saa7146_pgtable
*pt
)
136 int pages
= (length
+PAGE_SIZE
-1)/PAGE_SIZE
;
137 char *mem
= vmalloc_32(length
);
144 if (!(pt
->slist
= vmalloc_to_sg(mem
, pages
))) {
149 if (saa7146_pgtable_alloc(pci
, pt
)) {
156 slen
= pci_map_sg(pci
,pt
->slist
,pages
,PCI_DMA_FROMDEVICE
);
157 if (0 != saa7146_pgtable_build_single(pci
, pt
, pt
->slist
, slen
)) {
164 void saa7146_pgtable_free(struct pci_dev
*pci
, struct saa7146_pgtable
*pt
)
168 pci_free_consistent(pci
, pt
->size
, pt
->cpu
, pt
->dma
);
174 int saa7146_pgtable_alloc(struct pci_dev
*pci
, struct saa7146_pgtable
*pt
)
179 cpu
= pci_alloc_consistent(pci
, PAGE_SIZE
, &dma_addr
);
183 pt
->size
= PAGE_SIZE
;
190 int saa7146_pgtable_build_single(struct pci_dev
*pci
, struct saa7146_pgtable
*pt
,
191 struct scatterlist
*list
, int sglen
)
198 BUG_ON(list
->offset
> PAGE_SIZE
);
200 /* if we have a user buffer, the first page may not be
201 aligned to a page boundary. */
202 pt
->offset
= list
->offset
;
205 for (i
= 0; i
< sglen
; i
++, list
++) {
207 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
209 for (p
= 0; p
* 4096 < list
->length
; p
++, ptr
++) {
210 *ptr
= cpu_to_le32(sg_dma_address(list
) + p
* 4096);
216 /* safety; fill the page table up with the last valid page */
218 for(i
=nr_pages
;i
<1024;i
++) {
224 printk("offset: %d\n",pt->offset);
226 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
232 /********************************************************************************/
233 /* interrupt handler */
234 static irqreturn_t
interrupt_hw(int irq
, void *dev_id
, struct pt_regs
*regs
)
236 struct saa7146_dev
*dev
= dev_id
;
239 /* read out the interrupt status register */
240 isr
= saa7146_read(dev
, ISR
);
242 /* is this our interrupt? */
244 /* nope, some other device */
248 saa7146_write(dev
, ISR
, isr
);
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
);
255 isr
&= ~dev
->ext
->irq_mask
;
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
);
265 if (0 != (isr
& (MASK_28
))) {
266 if( 0 != dev
->vv_data
&& 0 != dev
->vv_callback
) {
267 dev
->vv_callback(dev
,isr
);
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
));
281 wake_up(&dev
->i2c_wq
);
283 DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status
, isr
));
286 DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status
, isr
));
288 isr
&= ~(MASK_16
|MASK_17
);
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
);
298 /*********************************************************************************/
299 /* configuration-functions */
301 static int saa7146_init_one(struct pci_dev
*pci
, const struct pci_device_id
*ent
)
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
;
308 /* clear out mem for sure */
309 dev
= kzalloc(sizeof(struct saa7146_dev
), GFP_KERNEL
);
311 ERR(("out of memory.\n"));
315 DEB_EE(("pci:%p\n",pci
));
317 err
= pci_enable_device(pci
);
319 ERR(("pci_enable_device() failed.\n"));
323 /* enable bus-mastering */
328 /* get chip-revision; this is needed to enable bug-fixes */
329 err
= pci_read_config_dword(pci
, PCI_CLASS_REVISION
, &dev
->revision
);
331 ERR(("pci_read_config_dword() failed.\n"));
334 dev
->revision
&= 0xf;
336 /* remap the memory from virtual to physical adress */
338 err
= pci_request_region(pci
, 0, "saa7146");
342 dev
->mem
= ioremap(pci_resource_start(pci
, 0),
343 pci_resource_len(pci
, 0));
345 ERR(("ioremap() failed.\n"));
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
354 saa7146_write(dev, MC1, MASK_31);
357 /* disable all irqs */
358 saa7146_write(dev
, IER
, 0);
360 /* shut down all dma transfers and rps tasks */
361 saa7146_write(dev
, MC1
, 0x30ff0000);
363 /* clear out any rps-signals pending */
364 saa7146_write(dev
, MC2
, 0xf8000000);
366 /* request an interrupt for the saa7146 */
367 err
= request_irq(pci
->irq
, interrupt_hw
, SA_SHIRQ
| SA_INTERRUPT
,
370 ERR(("request_irq() failed.\n"));
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
)
381 memset(dev
->d_rps0
.cpu_addr
, 0x0, SAA7146_RPS_MEM
);
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
)
387 memset(dev
->d_rps1
.cpu_addr
, 0x0, SAA7146_RPS_MEM
);
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
)
393 memset(dev
->d_i2c
.cpu_addr
, 0x0, SAA7146_RPS_MEM
);
395 /* the rest + print status message */
397 /* create a nice device name */
398 sprintf(dev
->name
, "saa7146 (%d)", saa7146_num
);
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
));
403 pci_set_drvdata(pci
, dev
);
405 init_MUTEX(&dev
->lock
);
406 spin_lock_init(&dev
->int_slock
);
407 spin_lock_init(&dev
->slock
);
409 init_MUTEX(&dev
->i2c_lock
);
411 dev
->module
= THIS_MODULE
;
412 init_waitqueue_head(&dev
->i2c_wq
);
414 /* set some sane pci arbitrition values */
415 saa7146_write(dev
, PCI_BT_V1
, 0x1c00101f);
417 /* TODO: use the status code of the callback */
421 if (ext
->probe
&& ext
->probe(dev
)) {
422 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev
));
426 if (ext
->attach(dev
, pci_ext
)) {
427 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev
));
431 INIT_LIST_HEAD(&dev
->item
);
432 list_add_tail(&dev
->item
,&saa7146_devices
);
440 pci_set_drvdata(pci
, NULL
);
442 pci_free_consistent(pci
, SAA7146_RPS_MEM
, dev
->d_i2c
.cpu_addr
,
443 dev
->d_i2c
.dma_handle
);
445 pci_free_consistent(pci
, SAA7146_RPS_MEM
, dev
->d_rps1
.cpu_addr
,
446 dev
->d_rps1
.dma_handle
);
448 pci_free_consistent(pci
, SAA7146_RPS_MEM
, dev
->d_rps0
.cpu_addr
,
449 dev
->d_rps0
.dma_handle
);
451 free_irq(pci
->irq
, (void *)dev
);
455 pci_release_region(pci
, 0);
457 pci_disable_device(pci
);
463 static void saa7146_remove_one(struct pci_dev
*pdev
)
465 struct saa7146_dev
* dev
= pci_get_drvdata(pdev
);
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
},
476 DEB_EE(("dev:%p\n",dev
));
478 dev
->ext
->detach(dev
);
480 /* shut down all video dma transfers */
481 saa7146_write(dev
, MC1
, 0x00ff0000);
483 /* disable all irqs, release irq-routine */
484 saa7146_write(dev
, IER
, 0);
486 free_irq(pdev
->irq
, dev
);
488 for (p
= dev_map
; p
->addr
; p
++)
489 pci_free_consistent(pdev
, SAA7146_RPS_MEM
, p
->addr
, p
->dma
);
492 pci_release_region(pdev
, 0);
493 list_del(&dev
->item
);
494 pci_disable_device(pdev
);
500 /*********************************************************************************/
501 /* extension handling functions */
503 int saa7146_register_extension(struct saa7146_extension
* ext
)
505 DEB_EE(("ext:%p\n",ext
));
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
;
512 printk("saa7146: register extension '%s'.\n",ext
->name
);
513 return pci_register_driver(&ext
->driver
);
516 int saa7146_unregister_extension(struct saa7146_extension
* ext
)
518 DEB_EE(("ext:%p\n",ext
));
519 printk("saa7146: unregister extension '%s'.\n",ext
->name
);
520 pci_unregister_driver(&ext
->driver
);
524 EXPORT_SYMBOL_GPL(saa7146_register_extension
);
525 EXPORT_SYMBOL_GPL(saa7146_unregister_extension
);
527 /* misc functions used by extension modules */
528 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc
);
529 EXPORT_SYMBOL_GPL(saa7146_pgtable_free
);
530 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single
);
531 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable
);
532 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done
);
534 EXPORT_SYMBOL_GPL(saa7146_setgpio
);
536 EXPORT_SYMBOL_GPL(saa7146_i2c_transfer
);
537 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare
);
539 EXPORT_SYMBOL_GPL(saa7146_debug
);
540 EXPORT_SYMBOL_GPL(saa7146_devices
);
541 EXPORT_SYMBOL_GPL(saa7146_devices_lock
);
543 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
544 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
545 MODULE_LICENSE("GPL");