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