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");