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 DECLARE_MUTEX(saa7146_devices_lock);
  25
  26 static int saa7146_num;
  27
  28 unsigned int saa7146_debug;
  29
  30 module_param(saa7146_debug, int, 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 = kmalloc(sizeof(struct scatterlist)*nr_pages, GFP_KERNEL);
 113         if (NULL == sglist)
 114                 return NULL;
 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);
 118                 if (NULL == pg)
 119                         goto err;
 120                 if (PageHighMem(pg))
 121                         BUG();
 122                 sglist[i].page   = pg;
 123                 sglist[i].length = PAGE_SIZE;
 124         }
 125         return sglist;
 126
 127  err:
 128         kfree(sglist);
 129         return NULL;
 130 }
 131
 132 /********************************************************************************/
 133 /* common page table functions */
 134
 135 char *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
 136 {
 137         int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
 138         char *mem = vmalloc_32(length);
 139         int slen = 0;
 140
 141         if (NULL == mem) {
 142                 return NULL;
 143         }
 144
 145         if (!(pt->slist = vmalloc_to_sg(mem, pages))) {
 146                 vfree(mem);
 147                 return NULL;
 148         }
 149
 150         if (saa7146_pgtable_alloc(pci, pt)) {
 151                 kfree(pt->slist);
 152                 pt->slist = NULL;
 153                 vfree(mem);
 154                 return NULL;
 155         }
 156
 157         slen = pci_map_sg(pci,pt->slist,pages,PCI_DMA_FROMDEVICE);
 158         if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen)) {
 159                 return NULL;
 160         }
 161
 162         return mem;
 163 }
 164
 165 void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
 166 {
 167         if (NULL == pt->cpu)
 168                 return;
 169         pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
 170         pt->cpu = NULL;
 171         kfree(pt->slist);
 172         pt->slist = NULL;
 173 }
 174
 175 int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
 176 {
 177         u32          *cpu;
 178         dma_addr_t   dma_addr;
 179
 180         cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
 181         if (NULL == cpu) {
 182                 return -ENOMEM;
 183         }
 184         pt->size = PAGE_SIZE;
 185         pt->cpu  = cpu;
 186         pt->dma  = dma_addr;
 187
 188         return 0;
 189 }
 190
 191 int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
 192         struct scatterlist *list, int sglen  )
 193 {
 194         u32 *ptr, fill;
 195         int nr_pages = 0;
 196         int i,p;
 197
 198         BUG_ON(0 == sglen);
 199         BUG_ON(list->offset > PAGE_SIZE);
 200
 201         /* if we have a user buffer, the first page may not be
 202            aligned to a page boundary. */
 203         pt->offset = list->offset;
 204
 205         ptr = pt->cpu;
 206         for (i = 0; i < sglen; i++, list++) {
 207 /*
 208                 printk("i:%d, adr:0x%08x, len:%d, offset:%d\n", i,sg_dma_address(list), sg_dma_len(list), list->offset);
 209 */
 210                 for (p = 0; p * 4096 < list->length; p++, ptr++) {
 211                         *ptr = cpu_to_le32(sg_dma_address(list) + p * 4096);
 212                         nr_pages++;
 213                 }
 214         }
 215
 216
 217         /* safety; fill the page table up with the last valid page */
 218         fill = *(ptr-1);
 219         for(i=nr_pages;i<1024;i++) {
 220                 *ptr++ = fill;
 221         }
 222
 223 /*
 224         ptr = pt->cpu;
 225         printk("offset: %d\n",pt->offset);
 226         for(i=0;i<5;i++) {
 227                 printk("ptr1 %d: 0x%08x\n",i,ptr[i]);
 228         }
 229 */
 230         return 0;
 231 }
 232
 233 /********************************************************************************/
 234 /* interrupt handler */
 235 static irqreturn_t interrupt_hw(int irq, void *dev_id, struct pt_regs *regs)
 236 {
 237         struct saa7146_dev *dev = dev_id;
 238         u32 isr = 0;
 239
 240         /* read out the interrupt status register */
 241         isr = saa7146_read(dev, ISR);
 242
 243         /* is this our interrupt? */
 244         if ( 0 == isr ) {
 245                 /* nope, some other device */
 246                 return IRQ_NONE;
 247         }
 248
 249         saa7146_write(dev, ISR, isr);
 250
 251         if( 0 != (dev->ext)) {
 252                 if( 0 != (dev->ext->irq_mask & isr )) {
 253                         if( 0 != dev->ext->irq_func ) {
 254                                 dev->ext->irq_func(dev, &isr);
 255                         }
 256                         isr &= ~dev->ext->irq_mask;
 257                 }
 258         }
 259         if (0 != (isr & (MASK_27))) {
 260                 DEB_INT(("irq: RPS0 (0x%08x).\n",isr));
 261                 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
 262                         dev->vv_callback(dev,isr);
 263                 }
 264                 isr &= ~MASK_27;
 265         }
 266         if (0 != (isr & (MASK_28))) {
 267                 if( 0 != dev->vv_data && 0 != dev->vv_callback) {
 268                         dev->vv_callback(dev,isr);
 269                 }
 270                 isr &= ~MASK_28;
 271         }
 272         if (0 != (isr & (MASK_16|MASK_17))) {
 273                 u32 status = saa7146_read(dev, I2C_STATUS);
 274                 if( (0x3 == (status & 0x3)) || (0 == (status & 0x1)) ) {
 275                         SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
 276                         /* only wake up if we expect something */
 277                         if( 0 != dev->i2c_op ) {
 278                                 u32 psr = (saa7146_read(dev, PSR) >> 16) & 0x2;
 279                                 u32 ssr = (saa7146_read(dev, SSR) >> 17) & 0x1f;
 280                                 DEB_I2C(("irq: i2c, status: 0x%08x, psr:0x%02x, ssr:0x%02x).\n",status,psr,ssr));
 281                                 dev->i2c_op = 0;
 282                                 wake_up(&dev->i2c_wq);
 283                         } else {
 284                                 DEB_I2C(("unexpected irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
 285                         }
 286                 } else {
 287                         DEB_I2C(("unhandled irq: i2c, status: 0x%08x, isr %#x\n",status, isr));
 288                 }
 289                 isr &= ~(MASK_16|MASK_17);
 290         }
 291         if( 0 != isr ) {
 292                 ERR(("warning: interrupt enabled, but not handled properly.(0x%08x)\n",isr));
 293                 ERR(("disabling interrupt source(s)!\n"));
 294                 SAA7146_IER_DISABLE(dev,isr);
 295         }
 296         return IRQ_HANDLED;
 297 }
 298
 299 /*********************************************************************************/
 300 /* configuration-functions                                                       */
 301
 302 static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
 303 {
 304         struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
 305         struct saa7146_extension *ext = pci_ext->ext;
 306         struct saa7146_dev *dev;
 307         int err = -ENOMEM;
 308
 309         dev = kmalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
 310         if (!dev) {
 311                 ERR(("out of memory.\n"));
 312                 goto out;
 313         }
 314
 315         /* clear out mem for sure */
 316         memset(dev, 0x0, sizeof(struct saa7146_dev));
 317
 318         DEB_EE(("pci:%p\n",pci));
 319
 320         err = pci_enable_device(pci);
 321         if (err < 0) {
 322                 ERR(("pci_enable_device() failed.\n"));
 323                 goto err_free;
 324         }
 325
 326         /* enable bus-mastering */
 327         pci_set_master(pci);
 328
 329         dev->pci = pci;
 330
 331         /* get chip-revision; this is needed to enable bug-fixes */
 332         err = pci_read_config_dword(pci, PCI_CLASS_REVISION, &dev->revision);
 333         if (err < 0) {
 334                 ERR(("pci_read_config_dword() failed.\n"));
 335                 goto err_disable;
 336         }
 337         dev->revision &= 0xf;
 338
 339         /* remap the memory from virtual to physical adress */
 340
 341         err = pci_request_region(pci, 0, "saa7146");
 342         if (err < 0)
 343                 goto err_disable;
 344
 345         dev->mem = ioremap(pci_resource_start(pci, 0),
 346                            pci_resource_len(pci, 0));
 347         if (!dev->mem) {
 348                 ERR(("ioremap() failed.\n"));
 349                 err = -ENODEV;
 350                 goto err_release;
 351         }
 352
 353         /* we don't do a master reset here anymore, it screws up
 354            some boards that don't have an i2c-eeprom for configuration
 355            values */
 356 /*
 357         saa7146_write(dev, MC1, MASK_31);
 358 */
 359
 360         /* disable all irqs */
 361         saa7146_write(dev, IER, 0);
 362
 363         /* shut down all dma transfers and rps tasks */
 364         saa7146_write(dev, MC1, 0x30ff0000);
 365
 366         /* clear out any rps-signals pending */
 367         saa7146_write(dev, MC2, 0xf8000000);
 368
 369         /* request an interrupt for the saa7146 */
 370         err = request_irq(pci->irq, interrupt_hw, SA_SHIRQ | SA_INTERRUPT,
 371                           dev->name, dev);
 372         if (err < 0) {
 373                 ERR(("request_irq() failed.\n"));
 374                 goto err_unmap;
 375         }
 376
 377         err = -ENOMEM;
 378
 379         /* get memory for various stuff */
 380         dev->d_rps0.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
 381                                                     &dev->d_rps0.dma_handle);
 382         if (!dev->d_rps0.cpu_addr)
 383                 goto err_free_irq;
 384         memset(dev->d_rps0.cpu_addr, 0x0, SAA7146_RPS_MEM);
 385
 386         dev->d_rps1.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
 387                                                     &dev->d_rps1.dma_handle);
 388         if (!dev->d_rps1.cpu_addr)
 389                 goto err_free_rps0;
 390         memset(dev->d_rps1.cpu_addr, 0x0, SAA7146_RPS_MEM);
 391
 392         dev->d_i2c.cpu_addr = pci_alloc_consistent(pci, SAA7146_RPS_MEM,
 393                                                    &dev->d_i2c.dma_handle);
 394         if (!dev->d_i2c.cpu_addr)
 395                 goto err_free_rps1;
 396         memset(dev->d_i2c.cpu_addr, 0x0, SAA7146_RPS_MEM);
 397
 398         /* the rest + print status message */
 399
 400         /* create a nice device name */
 401         sprintf(dev->name, "saa7146 (%d)", saa7146_num);
 402
 403         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));
 404         dev->ext = ext;
 405
 406         pci_set_drvdata(pci, dev);
 407
 408         init_MUTEX(&dev->lock);
 409         spin_lock_init(&dev->int_slock);
 410         spin_lock_init(&dev->slock);
 411
 412         init_MUTEX(&dev->i2c_lock);
 413
 414         dev->module = THIS_MODULE;
 415         init_waitqueue_head(&dev->i2c_wq);
 416
 417         /* set some sane pci arbitrition values */
 418         saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
 419
 420         /* TODO: use the status code of the callback */
 421
 422         err = -ENODEV;
 423
 424         if (ext->probe && ext->probe(dev)) {
 425                 DEB_D(("ext->probe() failed for %p. skipping device.\n",dev));
 426                 goto err_free_i2c;
 427         }
 428
 429         if (ext->attach(dev, pci_ext)) {
 430                 DEB_D(("ext->attach() failed for %p. skipping device.\n",dev));
 431                 goto err_unprobe;
 432         }
 433
 434         INIT_LIST_HEAD(&dev->item);
 435         list_add_tail(&dev->item,&saa7146_devices);
 436         saa7146_num++;
 437
 438         err = 0;
 439 out:
 440         return err;
 441
 442 err_unprobe:
 443         pci_set_drvdata(pci, NULL);
 444 err_free_i2c:
 445         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
 446                             dev->d_i2c.dma_handle);
 447 err_free_rps1:
 448         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
 449                             dev->d_rps1.dma_handle);
 450 err_free_rps0:
 451         pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
 452                             dev->d_rps0.dma_handle);
 453 err_free_irq:
 454         free_irq(pci->irq, (void *)dev);
 455 err_unmap:
 456         iounmap(dev->mem);
 457 err_release:
 458         pci_release_region(pci, 0);
 459 err_disable:
 460         pci_disable_device(pci);
 461 err_free:
 462         kfree(dev);
 463         goto out;
 464 }
 465
 466 static void saa7146_remove_one(struct pci_dev *pdev)
 467 {
 468         struct saa7146_dev* dev = pci_get_drvdata(pdev);
 469         struct {
 470                 void *addr;
 471                 dma_addr_t dma;
 472         } dev_map[] = {
 473                 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
 474                 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
 475                 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
 476                 { NULL, 0 }
 477         }, *p;
 478
 479         DEB_EE(("dev:%p\n",dev));
 480
 481         dev->ext->detach(dev);
 482
 483         /* shut down all video dma transfers */
 484         saa7146_write(dev, MC1, 0x00ff0000);
 485
 486         /* disable all irqs, release irq-routine */
 487         saa7146_write(dev, IER, 0);
 488
 489         free_irq(pdev->irq, dev);
 490
 491         for (p = dev_map; p->addr; p++)
 492                 pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
 493
 494         iounmap(dev->mem);
 495         pci_release_region(pdev, 0);
 496         list_del(&dev->item);
 497         pci_disable_device(pdev);
 498         kfree(dev);
 499
 500         saa7146_num--;
 501 }
 502
 503 /*********************************************************************************/
 504 /* extension handling functions                                                  */
 505
 506 int saa7146_register_extension(struct saa7146_extension* ext)
 507 {
 508         DEB_EE(("ext:%p\n",ext));
 509
 510         ext->driver.name = ext->name;
 511         ext->driver.id_table = ext->pci_tbl;
 512         ext->driver.probe = saa7146_init_one;
 513         ext->driver.remove = saa7146_remove_one;
 514
 515         printk("saa7146: register extension '%s'.\n",ext->name);
 516         return pci_register_driver(&ext->driver);
 517 }
 518
 519 int saa7146_unregister_extension(struct saa7146_extension* ext)
 520 {
 521         DEB_EE(("ext:%p\n",ext));
 522         printk("saa7146: unregister extension '%s'.\n",ext->name);
 523         pci_unregister_driver(&ext->driver);
 524         return 0;
 525 }
 526
 527 EXPORT_SYMBOL_GPL(saa7146_register_extension);
 528 EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
 529
 530 /* misc functions used by extension modules */
 531 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
 532 EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
 533 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
 534 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
 535 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
 536
 537 EXPORT_SYMBOL_GPL(saa7146_setgpio);
 538
 539 EXPORT_SYMBOL_GPL(saa7146_i2c_transfer);
 540 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
 541
 542 EXPORT_SYMBOL_GPL(saa7146_debug);
 543 EXPORT_SYMBOL_GPL(saa7146_devices);
 544 EXPORT_SYMBOL_GPL(saa7146_devices_lock);
 545
 546 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 547 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
 548 MODULE_LICENSE("GPL");