git.oblomov.eu Git - linux-2.6/blob - drivers/media/common/saa7146_core.c

   1 /*
   2     saa7146.o - driver for generic saa7146-based hardware
   3
   4     Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
   5
   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.
  10
  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.
  15
  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.
  19 */
  20
  21 #include <media/saa7146.h>
  22
  23 LIST_HEAD(saa7146_devices);
  24 DEFINE_MUTEX(saa7146_devices_lock);
  25
  26 static int saa7146_num;
  27
  28 unsigned int saa7146_debug;
  29
  30 module_param(saa7146_debug, uint, 0644);
  31 MODULE_PARM_DESC(saa7146_debug, "debug level (default: 0)");
  32
  33 #if 0
  34 static void dump_registers(struct saa7146_dev* dev)
  35 {
  36         int i = 0;
  37
  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));
  41         }
  42 }
  43 #endif
  44
  45 /****************************************************************************
  46  * gpio and debi helper functions
  47  ****************************************************************************/
  48
  49 void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
  50 {
  51         u32 value = 0;
  52
  53         BUG_ON(port > 3);
  54
  55         value = saa7146_read(dev, GPIO_CTRL);
  56         value &= ~(0xff << (8*port));
  57         value |= (data << (8*port));
  58         saa7146_write(dev, GPIO_CTRL, value);
  59 }
  60
  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)
  63 {
  64         unsigned long start;
  65         int err;
  66
  67         /* wait for registers to be programmed */
  68         start = jiffies;
  69         while (1) {
  70                 err = time_after(jiffies, start + HZ/20);
  71                 if (saa7146_read(dev, MC2) & 2)
  72                         break;
  73                 if (err) {
  74                         DEB_S(("timed out while waiting for registers getting programmed\n"));
  75                         return -ETIMEDOUT;
  76                 }
  77                 if (nobusyloop)
  78                         msleep(1);
  79         }
  80
  81         /* wait for transfer to complete */
  82         start = jiffies;
  83         while (1) {
  84                 err = time_after(jiffies, start + HZ/4);
  85                 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
  86                         break;
  87                 saa7146_read(dev, MC2);
  88                 if (err) {
  89                         DEB_S(("timed out while waiting for transfer completion\n"));
  90                         return -ETIMEDOUT;
  91                 }
  92                 if (nobusyloop)
  93                         msleep(1);
  94         }
  95
  96         return 0;
  97 }
  98
  99 /****************************************************************************
 100  * general helper functions
 101  ****************************************************************************/
 102
 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)
 107 {
 108         struct scatterlist *sglist;
 109         struct page *pg;
 110         int i;
 111
 112         sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
 113         if (NULL == sglist)
 114                 return NULL;
 115         for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
 116                 pg = vmalloc_to_page(virt);
 117                 if (NULL == pg)
 118                         goto err;
 119                 BUG_ON(PageHighMem(pg));
 120                 sglist[i].page   = pg;
 121                 sglist[i].length = PAGE_SIZE;
 122         }
 123         return sglist;
 124
 125  err:
 126         kfree(sglist);
 127         return NULL;
 128 }
 129
 130 /********************************************************************************/
 131 /* common page table functions */
 132
 133 void *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
 134 {
 135         int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
 136         void *mem = vmalloc_32(length);
 137         int slen = 0;
 138
 139         if (NULL == mem)
 140                 goto err_null;
 141
 142         if (!(pt->slist = vmalloc_to_sg(mem, pages)))
 143                 goto err_free_mem;
 144
 145         if (saa7146_pgtable_alloc(pci, pt))
 146                 goto err_free_slist;
 147
 148         pt->nents = pages;
 149         slen = pci_map_sg(pci,pt->slist,pt->nents,PCI_DMA_FROMDEVICE);
 150         if (0 == slen)
 151                 goto err_free_pgtable;
 152
 153         if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen))
 154                 goto err_unmap_sg;
 155
 156         return mem;
 157
 158 err_unmap_sg:
 159         pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
 160 err_free_pgtable:
 161         saa7146_pgtable_free(pci, pt);
 162 err_free_slist:
 163         kfree(pt->slist);
 164         pt->slist = NULL;
 165 err_free_mem:
 166         vfree(mem);
 167 err_null:
 168         return NULL;
 169 }
 170
 171 void saa7146_vfree_destroy_pgtable(struct pci_dev *pci, void *mem, struct saa7146_pgtable *pt)
 172 {
 173         pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
 174         saa7146_pgtable_free(pci, pt);
 175         kfree(pt->slist);
 176         pt->slist = NULL;
 177         vfree(mem);
 178 }
 179
 180 void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
 181 {
 182         if (NULL == pt->cpu)
 183                 return;
 184         pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
 185         pt->cpu = NULL;
 186 }
 187
 188 int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
 189 {
 190         u32          *cpu;
 191         dma_addr_t   dma_addr;
 192
 193         cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
 194         if (NULL == cpu) {
 195                 return -ENOMEM;
 196         }
 197         pt->size = PAGE_SIZE;
 198         pt->cpu  = cpu;
 199         pt->dma  = dma_addr;
 200
 201         return 0;
 202 }
 203
 204 int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
 205         struct scatterlist *list, int sglen  )
 206 {
 207         u32 *ptr, fill;
 208         int nr_pages = 0;
 209         int i,p;
 210
 211         BUG_ON(0 == sglen);
 212         BUG_ON(list->offset > PAGE_SIZE);
 213
 214         /* if we have a user buffer, the first page may not be
 215            aligned to a page boundary. */
 216         pt->offset = list->offset;
 217
 218         ptr = pt->cpu;
 219         for (i = 0; i < sglen; i++, list++) {
 220 /*
 221                 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
 222 */
 223                 for (p = 0; p * 4096 < list->length; p++, ptr++) {
 224                         *ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
 225                         nr_pages++;
 226                 }
 227         }
 228
 229
 230         /* safety; fill the page table up with the last valid page */
 231         fill = *(ptr-1);
 232         for(i=nr_pages;i<1024;i++) {
 233                 *ptr++ = fill;
 234         }
 235
 236 /*
 237         ptr = pt->cpu;
 238         printk("offset: %d\n",pt->offset);
 239         for(i=0;i<5;i++) {
 240                 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
 241         }
 242 */
 243         return 0;
 244 }
 245
 246 /********************************************************************************/
 247 /* interrupt handler */
 248 static irqreturn_t interrupt_hw(int irq, void *dev_id)
 249 {
 250         struct saa7146_dev *dev = dev_id;
 251         u32 isr;
 252         u32 ack_isr;
 253
 254         /* read out the interrupt status register */
 255         ack_isr = isr = saa7146_read(dev, ISR);
 256
 257         /* is this our interrupt? */
 258         if ( 0 == isr ) {
 259                 /* nope, some other device */
 260                 return IRQ_NONE;
 261         }
 262
 263         if( 0 != (dev->ext)) {
 264                 if( 0 != (dev->ext->irq_mask & isr )) {
 265                         if( 0 != dev->ext->irq_func ) {
 266                                 dev->ext->irq_func(dev, &isr);
 267                         }
 268                         isr &= ~dev->ext->irq_mask;
 269                 }
 270         }
 271         if (0 != (isr & (MASK_27))) {
 272                 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 273                 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
 274                         dev->vv_callback(dev,isr);
 275                 }
 276                 isr &= ~MASK_27;
 277         }
 278         if (0 != (isr & (MASK_28))) {
 279                 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
 280                         dev->vv_callback(dev,isr);
 281                 }
 282                 isr &= ~MASK_28;
 283         }
 284         if (0 != (isr & (MASK_16|MASK_17))) {
 285                 SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
 286                 /* only wake up if we expect something */
 287                 if (0 != dev->i2c_op) {
 288                         dev->i2c_op = 0;
 289                         wake_up(&dev->i2c_wq);
 290                 } else {
 291                         u32 psr = saa7146_read(dev, PSR);
 292                         u32 ssr = saa7146_read(dev, SSR);
 293                         printk(KERN_WARNING "%s: unexpected i2c irq: isr %08x psr %08x ssr %08x\n",
 294                                dev->name, isr, psr, ssr);
 295                 }
 296                 isr &= ~(MASK_16|MASK_17);
 297         }
 298         if( 0 != isr ) {
 299                 ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
 300                 ERR(("disabling interrupt source(s)!\n"));
 301                 SAA7146_IER_DISABLE(dev,isr);
 302         }
 303         saa7146_write(dev, ISR, ack_isr);
 304         return IRQ_HANDLED;
 305 }
 306
 307 /*********************************************************************************/
 308 /* configuration-functions                                                       */
 309
 310 static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
 311 {
 312         struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
 313         struct saa7146_extension *ext = pci_ext->ext;
 314         struct saa7146_dev *dev;
 315         int err = -ENOMEM;
 316
 317         /* clear out mem for sure */
 318         dev = kzalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
 319         if (!dev) {
 320                 ERR(("out of memory.\n"));
 321                 goto out;
 322         }
 323
 324         DEB_EE(("pci:%p\n",pci));
 325
 326         err = pci_enable_device(pci);
 327         if (err < 0) {
 328                 ERR(("pci_enable_device() failed.\n"));
 329                 goto err_free;
 330         }
 331
 332         /* enable bus-mastering */
 333         pci_set_master(pci);
 334
 335         dev->pci = pci;
 336
 337         /* get chip-revision; this is needed to enable bug-fixes */
 338         err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
 339         if (err < 0) {
 340                 ERR(("pci_read_config_dword() failed.\n"));
 341                 goto err_disable;
 342         }
 343         dev->revision &= 0xf;
 344
 345         /* remap the memory from virtual to physical adress */
 346
 347         err = pci_request_region(pci, 0, "saa7146");
 348         if (err < 0)
 349                 goto err_disable;
 350
 351         dev->mem = ioremap(pci_resource_start(pci, 0),
 352                            pci_resource_len(pci, 0));
 353         if (!dev->mem) {
 354                 ERR(("ioremap() failed.\n"));
 355                 err = -ENODEV;
 356                 goto err_release;
 357         }
 358
 359         /* we don't do a master reset here anymore, it screws up
 360            some boards that don't have an i2c-eeprom for configuration
 361            values */
 362 /*
 363         saa7146_write(dev, MC1, MASK_31);
 364 */
 365
 366         /* disable all irqs */
 367         saa7146_write(dev, IER, 0);
 368
 369         /* shut down all dma transfers and rps tasks */
 370         saa7146_write(dev, MC1, 0x30ff0000);
 371
 372         /* clear out any rps-signals pending */
 373         saa7146_write(dev, MC2, 0xf8000000);
 374
 375         /* request an interrupt for the saa7146 */
 376         err = request_irq(pci->irq, interrupt_hw, IRQF_SHARED | IRQF_DISABLED,
 377                           dev->name, dev);
 378         if (err < 0) {
 379                 ERR(("request_irq() failed.\n"));
 380                 goto err_unmap;
 381         }
 382
 383         err = -ENOMEM;
 384
 385         /* get memory for various stuff */
 386         dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
 387                                                     &dev->d_rps0.dma_handle);
 388         if (!dev->d_rps0.cpu_addr)
 389                 goto err_free_irq;
 390         memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
 391
 392         dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
 393                                                     &dev->d_rps1.dma_handle);
 394         if (!dev->d_rps1.cpu_addr)
 395                 goto err_free_rps0;
 396         memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
 397
 398         dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
 399                                                    &dev->d_i2c.dma_handle);
 400         if (!dev->d_i2c.cpu_addr)
 401                 goto err_free_rps1;
 402         memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
 403
 404         /* the rest + print status message */
 405
 406         /* create a nice device name */
 407         sprintf(dev->name, "saa7146 (%d)", saa7146_num);
 408
 409         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));
 410         dev->ext = ext;
 411
 412         pci_set_drvdata(pci, dev);
 413
 414         mutex_init(&dev->lock);
 415         spin_lock_init(&dev->int_slock);
 416         spin_lock_init(&dev->slock);
 417
 418         mutex_init(&dev->i2c_lock);
 419
 420         dev->module = THIS_MODULE;
 421         init_waitqueue_head(&dev->i2c_wq);
 422
 423         /* set some sane pci arbitrition values */
 424         saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
 425
 426         /* TODO: use the status code of the callback */
 427
 428         err = -ENODEV;
 429
 430         if (ext->probe && ext->probe(dev)) {
 431                 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
 432                 goto err_free_i2c;
 433         }
 434
 435         if (ext->attach(dev, pci_ext)) {
 436                 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
 437                 goto err_unprobe;
 438         }
 439
 440         INIT_LIST_HEAD(&dev->item);
 441         list_add_tail(&dev->item,&saa7146_devices);
 442         saa7146_num++;
 443
 444         err = 0;
 445 out:
 446         return err;
 447
 448 err_unprobe:
 449         pci_set_drvdata(pci, NULL);
 450 err_free_i2c:
 451         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
 452                             dev->d_i2c.dma_handle);
 453 err_free_rps1:
 454         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
 455                             dev->d_rps1.dma_handle);
 456 err_free_rps0:
 457         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
 458                             dev->d_rps0.dma_handle);
 459 err_free_irq:
 460         free_irq(pci->irq, (void *)dev);
 461 err_unmap:
 462         iounmap(dev->mem);
 463 err_release:
 464         pci_release_region(pci, 0);
 465 err_disable:
 466         pci_disable_device(pci);
 467 err_free:
 468         kfree(dev);
 469         goto out;
 470 }
 471
 472 static void saa7146_remove_one(struct pci_dev *pdev)
 473 {
 474         struct saa7146_dev* dev = pci_get_drvdata(pdev);
 475         struct {
 476                 void *addr;
 477                 dma_addr_t dma;
 478         } dev_map[] = {
 479                 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
 480                 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
 481                 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
 482                 { NULL, 0 }
 483         }, *p;
 484
 485         DEB_EE(("dev:%p\n",dev));
 486
 487         dev->ext->detach(dev);
 488
 489         /* shut down all video dma transfers */
 490         saa7146_write(dev, MC1, 0x00ff0000);
 491
 492         /* disable all irqs, release irq-routine */
 493         saa7146_write(dev, IER, 0);
 494
 495         free_irq(pdev->irq, dev);
 496
 497         for (p = dev_map; p->addr; p++)
 498                 pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
 499
 500         iounmap(dev->mem);
 501         pci_release_region(pdev, 0);
 502         list_del(&dev->item);
 503         pci_disable_device(pdev);
 504         kfree(dev);
 505
 506         saa7146_num--;
 507 }
 508
 509 /*********************************************************************************/
 510 /* extension handling functions                                                  */
 511
 512 int saa7146_register_extension(struct saa7146_extension* ext)
 513 {
 514         DEB_EE(("ext:%p\n",ext));
 515
 516         ext->driver.name = ext->name;
 517         ext->driver.id_table = ext->pci_tbl;
 518         ext->driver.probe = saa7146_init_one;
 519         ext->driver.remove = saa7146_remove_one;
 520
 521         printk("saa7146: register extension '%s'.\n",ext->name);
 522         return pci_register_driver(&ext->driver);
 523 }
 524
 525 int saa7146_unregister_extension(struct saa7146_extension* ext)
 526 {
 527         DEB_EE(("ext:%p\n",ext));
 528         printk("saa7146: unregister extension '%s'.\n",ext->name);
 529         pci_unregister_driver(&ext->driver);
 530         return 0;
 531 }
 532
 533 EXPORT_SYMBOL_GPL(saa7146_register_extension);
 534 EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
 535
 536 /* misc functions used by extension modules */
 537 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
 538 EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
 539 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
 540 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
 541 EXPORT_SYMBOL_GPL(saa7146_vfree_destroy_pgtable);
 542 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
 543
 544 EXPORT_SYMBOL_GPL(saa7146_setgpio);
 545
 546 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
 547
 548 EXPORT_SYMBOL_GPL(saa7146_debug);
 549 EXPORT_SYMBOL_GPL(saa7146_devices);
 550 EXPORT_SYMBOL_GPL(saa7146_devices_lock);
 551
 552 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 553 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
 554 MODULE_LICENSE("GPL");