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