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;
28 static int saa7146_num = 0;
30 unsigned int saa7146_debug = 0;
32 module_param(saa7146_debug, int, 0644);
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" -- unused */
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, int nobusyloop)
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"));
87 /* wait for transfer to complete */
90 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
92 saa7146_read(dev, MC2);
93 if (time_after(jiffies, start + HZ/4)) {
94 DEB_S(("timed out while waiting for transfer completion\n"));
104 /****************************************************************************
105 * general helper functions
106 ****************************************************************************/
108 /* this is videobuf_vmalloc_to_sg() from video-buf.c
109 make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
110 may be triggered on highmem machines */
111 static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
113 struct scatterlist *sglist;
117 sglist = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
120 memset(sglist,0,sizeof(struct scatterlist)*nr_pages);
121 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
122 pg = vmalloc_to_page(virt);
128 sglist[i].length = PAGE_SIZE;
137 /********************************************************************************/
138 /* common page table functions */
140 char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
142 int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
143 char *mem = vmalloc_32(length);
150 if (!(pt->slist = vmalloc_to_sg(mem, pages))) {
155 if (saa7146_pgtable_alloc(pci, pt)) {
162 slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE);
163 if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) {
170 void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
174 pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
176 if (NULL != pt->slist) {
182 int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
187 cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
191 pt->size = PAGE_SIZE;
198 int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
199 struct scatterlist *list, int sglen )
206 BUG_ON(list->offset > PAGE_SIZE);
208 /* if we have a user buffer, the first page may not be
209 aligned to a page boundary. */
210 pt->offset = list->offset;
213 for (i = 0; i < sglen; i++, list++) {
215 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
217 for (p = 0; p * 4096 < list->length; p++, ptr++) {
218 *ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
224 /* safety; fill the page table up with the last valid page */
226 for(i=nr_pages;i<1024;i++) {
232 printk("offset: %d\n",pt->offset);
234 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
240 /********************************************************************************/
243 void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
247 val=saa7146_read(dev,GPIO_CTRL);
248 val&=~(0xff << (8*(port)));
249 val|=(data)<<(8*(port));
250 saa7146_write(dev, GPIO_CTRL, val);
253 /********************************************************************************/
254 /* interrupt handler */
255 static irqreturn_t interrupt_hw(int irq, void *dev_id, struct pt_regs *regs)
257 struct saa7146_dev *dev = dev_id;
260 /* read out the interrupt status register */
261 isr = saa7146_read(dev, ISR);
263 /* is this our interrupt? */
265 /* nope, some other device */
269 saa7146_write(dev, ISR, isr);
271 if( 0 != (dev->ext)) {
272 if( 0 != (dev->ext->irq_mask & isr )) {
273 if( 0 != dev->ext->irq_func ) {
274 dev->ext->irq_func(dev, &isr);
276 isr &= ~dev->ext->irq_mask;
279 if (0 != (isr & (MASK_27))) {
280 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
281 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
282 dev->vv_callback(dev,isr);
286 if (0 != (isr & (MASK_28))) {
287 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
288 dev->vv_callback(dev,isr);
292 if (0 != (isr & (MASK_16|MASK_17))) {
293 u32 status = saa7146_read(dev, I2C_STATUS);
294 if( (0x3 == (status & 0x3)) || (0 == (status & 0x1)) ) {
295 SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
296 /* only wake up if we expect something */
297 if( 0 != dev->i2c_op ) {
298 u32 psr = (saa7146_read(dev, PSR) >> 16) & 0x2;
299 u32 ssr = (saa7146_read(dev, SSR) >> 17) & 0x1f;
300 DEB_I2C(("irq: i2c, status: 0x%08x, psr:0x%02x, ssr:0x%02x).\n",status,psr,ssr));
302 wake_up(&dev->i2c_wq);
304 DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
307 DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
309 isr &= ~(MASK_16|MASK_17);
312 ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
313 ERR(("disabling interrupt source(s)!\n"));
314 SAA7146_IER_DISABLE(dev,isr);
319 /*********************************************************************************/
320 /* configuration-functions */
322 static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
324 struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
325 struct saa7146_extension* ext = pci_ext->ext;
326 struct saa7146_dev *dev;
329 dev = kmalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
331 ERR(("out of memory.\n"));
335 /* clear out mem for sure */
336 memset(dev, 0x0, sizeof(struct saa7146_dev));
338 DEB_EE(("pci:%p\n",pci));
340 err = pci_enable_device(pci);
342 ERR(("pci_enable_device() failed.\n"));
346 /* enable bus-mastering */
351 /* get chip-revision; this is needed to enable bug-fixes */
352 err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
354 ERR(("pci_read_config_dword() failed.\n"));
357 dev->revision &= 0xf;
359 /* remap the memory from virtual to physical adress */
361 err = pci_request_region(pci, 0, "saa7146");
365 dev->mem = ioremap(pci_resource_start(pci, 0),
366 pci_resource_len(pci, 0));
368 ERR(("ioremap() failed.\n"));
373 /* we don't do a master reset here anymore, it screws up
374 some boards that don't have an i2c-eeprom for configuration
377 saa7146_write(dev, MC1, MASK_31);
380 /* disable all irqs */
381 saa7146_write(dev, IER, 0);
383 /* shut down all dma transfers and rps tasks */
384 saa7146_write(dev, MC1, 0x30ff0000);
386 /* clear out any rps-signals pending */
387 saa7146_write(dev, MC2, 0xf8000000);
389 /* request an interrupt for the saa7146 */
390 err = request_irq(pci->irq, interrupt_hw, SA_SHIRQ | SA_INTERRUPT,
393 ERR(("request_irq() failed.\n"));
399 /* get memory for various stuff */
400 dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
401 &dev->d_rps0.dma_handle);
402 if (!dev->d_rps0.cpu_addr)
404 memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
406 dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
407 &dev->d_rps1.dma_handle);
408 if (!dev->d_rps1.cpu_addr)
410 memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
412 dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
413 &dev->d_i2c.dma_handle);
414 if (!dev->d_i2c.cpu_addr)
416 memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
418 /* the rest + print status message */
420 /* create a nice device name */
421 sprintf(dev->name, "saa7146 (%d)", saa7146_num);
423 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));
426 pci_set_drvdata(pci,dev);
428 init_MUTEX(&dev->lock);
429 spin_lock_init(&dev->int_slock);
430 spin_lock_init(&dev->slock);
432 init_MUTEX(&dev->i2c_lock);
434 dev->module = THIS_MODULE;
435 init_waitqueue_head(&dev->i2c_wq);
437 /* set some sane pci arbitrition values */
438 saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
440 /* TODO: use the status code of the callback */
444 if (ext->probe && ext->probe(dev)) {
445 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
449 if (ext->attach(dev, pci_ext)) {
450 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
454 INIT_LIST_HEAD(&dev->item);
455 list_add_tail(&dev->item,&saa7146_devices);
463 pci_set_drvdata(pci,NULL);
465 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
466 dev->d_i2c.dma_handle);
468 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
469 dev->d_rps1.dma_handle);
471 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
472 dev->d_rps0.dma_handle);
474 free_irq(pci->irq, (void *)dev);
478 pci_release_region(pci, 0);
480 pci_disable_device(pci);
486 static void saa7146_remove_one(struct pci_dev *pdev)
488 struct saa7146_dev* dev = pci_get_drvdata(pdev);
493 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
494 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
495 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
499 DEB_EE(("dev:%p\n",dev));
501 dev->ext->detach(dev);
503 /* shut down all video dma transfers */
504 saa7146_write(dev, MC1, 0x00ff0000);
506 /* disable all irqs, release irq-routine */
507 saa7146_write(dev, IER, 0);
509 free_irq(pdev->irq, dev);
511 for (p = dev_map; p->addr; p++)
512 pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
515 pci_release_region(pdev, 0);
516 list_del(&dev->item);
517 pci_disable_device(pdev);
523 /*********************************************************************************/
524 /* extension handling functions */
526 int saa7146_register_extension(struct saa7146_extension* ext)
528 DEB_EE(("ext:%p\n",ext));
530 if( 0 == initialized ) {
531 INIT_LIST_HEAD(&saa7146_devices);
532 init_MUTEX(&saa7146_devices_lock);
536 ext->driver.name = ext->name;
537 ext->driver.id_table = ext->pci_tbl;
538 ext->driver.probe = saa7146_init_one;
539 ext->driver.remove = saa7146_remove_one;
541 printk("saa7146: register extension '%s'.\n",ext->name);
542 return pci_module_init(&ext->driver);
545 int saa7146_unregister_extension(struct saa7146_extension* ext)
547 DEB_EE(("ext:%p\n",ext));
548 printk("saa7146: unregister extension '%s'.\n",ext->name);
549 pci_unregister_driver(&ext->driver);
553 static int __init saa7146_init_module(void)
555 if( 0 == initialized ) {
556 INIT_LIST_HEAD(&saa7146_devices);
557 init_MUTEX(&saa7146_devices_lock);
563 static void __exit saa7146_cleanup_module(void)
567 module_init(saa7146_init_module);
568 module_exit(saa7146_cleanup_module);
570 EXPORT_SYMBOL_GPL(saa7146_register_extension);
571 EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
573 /* misc functions used by extension modules */
574 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
575 EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
576 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
577 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
578 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
580 EXPORT_SYMBOL_GPL(saa7146_setgpio);
582 EXPORT_SYMBOL_GPL(saa7146_i2c_transfer);
583 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
585 EXPORT_SYMBOL_GPL(saa7146_debug);
586 EXPORT_SYMBOL_GPL(saa7146_devices);
587 EXPORT_SYMBOL_GPL(saa7146_devices_lock);
589 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
590 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
591 MODULE_LICENSE("GPL");