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 = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
115 memset(sglist,0,sizeof(struct scatterlist)*nr_pages);
116 for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
117 pg = vmalloc_to_page(virt);
123 sglist[i].length = PAGE_SIZE;
132 /********************************************************************************/
133 /* common page table functions */
135 char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
137 int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
138 char *mem = vmalloc_32(length);
145 if (!(pt->slist = vmalloc_to_sg(mem, pages))) {
150 if (saa7146_pgtable_alloc(pci, pt)) {
157 slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE);
158 if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) {
165 void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
169 pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
171 if (NULL != pt->slist) {
177 int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
182 cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
186 pt->size = PAGE_SIZE;
193 int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
194 struct scatterlist *list, int sglen )
201 BUG_ON(list->offset > PAGE_SIZE);
203 /* if we have a user buffer, the first page may not be
204 aligned to a page boundary. */
205 pt->offset = list->offset;
208 for (i = 0; i < sglen; i++, list++) {
210 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
212 for (p = 0; p * 4096 < list->length; p++, ptr++) {
213 *ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
219 /* safety; fill the page table up with the last valid page */
221 for(i=nr_pages;i<1024;i++) {
227 printk("offset: %d\n",pt->offset);
229 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
235 /********************************************************************************/
236 /* interrupt handler */
237 static irqreturn_t interrupt_hw(int irq, void *dev_id, struct pt_regs *regs)
239 struct saa7146_dev *dev = dev_id;
242 /* read out the interrupt status register */
243 isr = saa7146_read(dev, ISR);
245 /* is this our interrupt? */
247 /* nope, some other device */
251 saa7146_write(dev, ISR, isr);
253 if( 0 != (dev->ext)) {
254 if( 0 != (dev->ext->irq_mask & isr )) {
255 if( 0 != dev->ext->irq_func ) {
256 dev->ext->irq_func(dev, &isr);
258 isr &= ~dev->ext->irq_mask;
261 if (0 != (isr & (MASK_27))) {
262 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
263 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
264 dev->vv_callback(dev,isr);
268 if (0 != (isr & (MASK_28))) {
269 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
270 dev->vv_callback(dev,isr);
274 if (0 != (isr & (MASK_16|MASK_17))) {
275 u32 status = saa7146_read(dev, I2C_STATUS);
276 if( (0x3 == (status & 0x3)) || (0 == (status & 0x1)) ) {
277 SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
278 /* only wake up if we expect something */
279 if( 0 != dev->i2c_op ) {
280 u32 psr = (saa7146_read(dev, PSR) >> 16) & 0x2;
281 u32 ssr = (saa7146_read(dev, SSR) >> 17) & 0x1f;
282 DEB_I2C(("irq: i2c, status: 0x%08x, psr:0x%02x, ssr:0x%02x).\n",status,psr,ssr));
284 wake_up(&dev->i2c_wq);
286 DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
289 DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
291 isr &= ~(MASK_16|MASK_17);
294 ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
295 ERR(("disabling interrupt source(s)!\n"));
296 SAA7146_IER_DISABLE(dev,isr);
301 /*********************************************************************************/
302 /* configuration-functions */
304 static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
306 struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
307 struct saa7146_extension *ext = pci_ext->ext;
308 struct saa7146_dev *dev;
311 dev = kmalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
313 ERR(("out of memory.\n"));
317 /* clear out mem for sure */
318 memset(dev, 0x0, sizeof(struct saa7146_dev));
320 DEB_EE(("pci:%p\n",pci));
322 err = pci_enable_device(pci);
324 ERR(("pci_enable_device() failed.\n"));
328 /* enable bus-mastering */
333 /* get chip-revision; this is needed to enable bug-fixes */
334 err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
336 ERR(("pci_read_config_dword() failed.\n"));
339 dev->revision &= 0xf;
341 /* remap the memory from virtual to physical adress */
343 err = pci_request_region(pci, 0, "saa7146");
347 dev->mem = ioremap(pci_resource_start(pci, 0),
348 pci_resource_len(pci, 0));
350 ERR(("ioremap() failed.\n"));
355 /* we don't do a master reset here anymore, it screws up
356 some boards that don't have an i2c-eeprom for configuration
359 saa7146_write(dev, MC1, MASK_31);
362 /* disable all irqs */
363 saa7146_write(dev, IER, 0);
365 /* shut down all dma transfers and rps tasks */
366 saa7146_write(dev, MC1, 0x30ff0000);
368 /* clear out any rps-signals pending */
369 saa7146_write(dev, MC2, 0xf8000000);
371 /* request an interrupt for the saa7146 */
372 err = request_irq(pci->irq, interrupt_hw, SA_SHIRQ | SA_INTERRUPT,
375 ERR(("request_irq() failed.\n"));
381 /* get memory for various stuff */
382 dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
383 &dev->d_rps0.dma_handle);
384 if (!dev->d_rps0.cpu_addr)
386 memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
388 dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
389 &dev->d_rps1.dma_handle);
390 if (!dev->d_rps1.cpu_addr)
392 memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
394 dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
395 &dev->d_i2c.dma_handle);
396 if (!dev->d_i2c.cpu_addr)
398 memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
400 /* the rest + print status message */
402 /* create a nice device name */
403 sprintf(dev->name, "saa7146 (%d)", saa7146_num);
405 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));
408 pci_set_drvdata(pci, dev);
410 init_MUTEX(&dev->lock);
411 spin_lock_init(&dev->int_slock);
412 spin_lock_init(&dev->slock);
414 init_MUTEX(&dev->i2c_lock);
416 dev->module = THIS_MODULE;
417 init_waitqueue_head(&dev->i2c_wq);
419 /* set some sane pci arbitrition values */
420 saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
422 /* TODO: use the status code of the callback */
426 if (ext->probe && ext->probe(dev)) {
427 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
431 if (ext->attach(dev, pci_ext)) {
432 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
436 INIT_LIST_HEAD(&dev->item);
437 list_add_tail(&dev->item,&saa7146_devices);
445 pci_set_drvdata(pci, NULL);
447 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
448 dev->d_i2c.dma_handle);
450 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
451 dev->d_rps1.dma_handle);
453 pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
454 dev->d_rps0.dma_handle);
456 free_irq(pci->irq, (void *)dev);
460 pci_release_region(pci, 0);
462 pci_disable_device(pci);
468 static void saa7146_remove_one(struct pci_dev *pdev)
470 struct saa7146_dev* dev = pci_get_drvdata(pdev);
475 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
476 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
477 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
481 DEB_EE(("dev:%p\n",dev));
483 dev->ext->detach(dev);
485 /* shut down all video dma transfers */
486 saa7146_write(dev, MC1, 0x00ff0000);
488 /* disable all irqs, release irq-routine */
489 saa7146_write(dev, IER, 0);
491 free_irq(pdev->irq, dev);
493 for (p = dev_map; p->addr; p++)
494 pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
497 pci_release_region(pdev, 0);
498 list_del(&dev->item);
499 pci_disable_device(pdev);
505 /*********************************************************************************/
506 /* extension handling functions */
508 int saa7146_register_extension(struct saa7146_extension* ext)
510 DEB_EE(("ext:%p\n",ext));
512 ext->driver.name = ext->name;
513 ext->driver.id_table = ext->pci_tbl;
514 ext->driver.probe = saa7146_init_one;
515 ext->driver.remove = saa7146_remove_one;
517 printk("saa7146: register extension '%s'.\n",ext->name);
518 return pci_register_driver(&ext->driver);
521 int saa7146_unregister_extension(struct saa7146_extension* ext)
523 DEB_EE(("ext:%p\n",ext));
524 printk("saa7146: unregister extension '%s'.\n",ext->name);
525 pci_unregister_driver(&ext->driver);
529 EXPORT_SYMBOL_GPL(saa7146_register_extension);
530 EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
532 /* misc functions used by extension modules */
533 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
534 EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
535 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
536 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
537 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
539 EXPORT_SYMBOL_GPL(saa7146_setgpio);
541 EXPORT_SYMBOL_GPL(saa7146_i2c_transfer);
542 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
544 EXPORT_SYMBOL_GPL(saa7146_debug);
545 EXPORT_SYMBOL_GPL(saa7146_devices);
546 EXPORT_SYMBOL_GPL(saa7146_devices_lock);
548 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
549 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
550 MODULE_LICENSE("GPL");