drivers/media/common/saa7146/saa7146_core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     saa7146.o - driver for generic saa7146-based hardware
   4
   5     Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
   6
   7 */
   8
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <media/drv-intf/saa7146.h>
  12 #include <linux/module.h>
  13
  14 static int saa7146_num;
  15
  16 unsigned int saa7146_debug;
  17
  18 module_param(saa7146_debug, uint, 0644);
  19 MODULE_PARM_DESC(saa7146_debug, "debug level (default: 0)");
  20
  21 #if 0
  22 static void dump_registers(struct saa7146_dev* dev)
  23 {
  24         int i = 0;
  25
  26         pr_info(" @ %li jiffies:\n", jiffies);
  27         for (i = 0; i <= 0x148; i += 4)
  28                 pr_info("0x%03x: 0x%08x\n", i, saa7146_read(dev, i));
  29 }
  30 #endif
  31
  32 /****************************************************************************
  33  * gpio and debi helper functions
  34  ****************************************************************************/
  35
  36 void saa7146_setgpio(struct saa7146_dev *dev, int port, u32 data)
  37 {
  38         u32 value = 0;
  39
  40         if (WARN_ON(port > 3))
  41                 return;
  42
  43         value = saa7146_read(dev, GPIO_CTRL);
  44         value &= ~(0xff << (8*port));
  45         value |= (data << (8*port));
  46         saa7146_write(dev, GPIO_CTRL, value);
  47 }
  48
  49 /* This DEBI code is based on the saa7146 Stradis driver by Nathan Laredo */
  50 static inline int saa7146_wait_for_debi_done_sleep(struct saa7146_dev *dev,
  51                                 unsigned long us1, unsigned long us2)
  52 {
  53         unsigned long timeout;
  54         int err;
  55
  56         /* wait for registers to be programmed */
  57         timeout = jiffies + usecs_to_jiffies(us1);
  58         while (1) {
  59                 err = time_after(jiffies, timeout);
  60                 if (saa7146_read(dev, MC2) & 2)
  61                         break;
  62                 if (err) {
  63                         pr_debug("%s: %s timed out while waiting for registers getting programmed\n",
  64                                dev->name, __func__);
  65                         return -ETIMEDOUT;
  66                 }
  67                 msleep(1);
  68         }
  69
  70         /* wait for transfer to complete */
  71         timeout = jiffies + usecs_to_jiffies(us2);
  72         while (1) {
  73                 err = time_after(jiffies, timeout);
  74                 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
  75                         break;
  76                 saa7146_read(dev, MC2);
  77                 if (err) {
  78                         DEB_S("%s: %s timed out while waiting for transfer completion\n",
  79                               dev->name, __func__);
  80                         return -ETIMEDOUT;
  81                 }
  82                 msleep(1);
  83         }
  84
  85         return 0;
  86 }
  87
  88 static inline int saa7146_wait_for_debi_done_busyloop(struct saa7146_dev *dev,
  89                                 unsigned long us1, unsigned long us2)
  90 {
  91         unsigned long loops;
  92
  93         /* wait for registers to be programmed */
  94         loops = us1;
  95         while (1) {
  96                 if (saa7146_read(dev, MC2) & 2)
  97                         break;
  98                 if (!loops--) {
  99                         pr_err("%s: %s timed out while waiting for registers getting programmed\n",
 100                                dev->name, __func__);
 101                         return -ETIMEDOUT;
 102                 }
 103                 udelay(1);
 104         }
 105
 106         /* wait for transfer to complete */
 107         loops = us2 / 5;
 108         while (1) {
 109                 if (!(saa7146_read(dev, PSR) & SPCI_DEBI_S))
 110                         break;
 111                 saa7146_read(dev, MC2);
 112                 if (!loops--) {
 113                         DEB_S("%s: %s timed out while waiting for transfer completion\n",
 114                               dev->name, __func__);
 115                         return -ETIMEDOUT;
 116                 }
 117                 udelay(5);
 118         }
 119
 120         return 0;
 121 }
 122
 123 int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
 124 {
 125         if (nobusyloop)
 126                 return saa7146_wait_for_debi_done_sleep(dev, 50000, 250000);
 127         else
 128                 return saa7146_wait_for_debi_done_busyloop(dev, 50000, 250000);
 129 }
 130
 131 /****************************************************************************
 132  * general helper functions
 133  ****************************************************************************/
 134
 135 /* this is videobuf_vmalloc_to_sg() from videobuf-dma-sg.c
 136    make sure virt has been allocated with vmalloc_32(), otherwise return NULL
 137    on highmem machines */
 138 static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
 139 {
 140         struct scatterlist *sglist;
 141         struct page *pg;
 142         int i;
 143
 144         sglist = kmalloc_array(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
 145         if (NULL == sglist)
 146                 return NULL;
 147         sg_init_table(sglist, nr_pages);
 148         for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
 149                 pg = vmalloc_to_page(virt);
 150                 if (NULL == pg)
 151                         goto err;
 152                 if (WARN_ON(PageHighMem(pg)))
 153                         goto err;
 154                 sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
 155         }
 156         return sglist;
 157
 158  err:
 159         kfree(sglist);
 160         return NULL;
 161 }
 162
 163 /********************************************************************************/
 164 /* common page table functions */
 165
 166 void *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa7146_pgtable *pt)
 167 {
 168         int pages = (length+PAGE_SIZE-1)/PAGE_SIZE;
 169         void *mem = vmalloc_32(length);
 170         int slen = 0;
 171
 172         if (NULL == mem)
 173                 goto err_null;
 174
 175         if (!(pt->slist = vmalloc_to_sg(mem, pages)))
 176                 goto err_free_mem;
 177
 178         if (saa7146_pgtable_alloc(pci, pt))
 179                 goto err_free_slist;
 180
 181         pt->nents = pages;
 182         slen = dma_map_sg(&pci->dev, pt->slist, pt->nents, DMA_FROM_DEVICE);
 183         if (0 == slen)
 184                 goto err_free_pgtable;
 185
 186         if (0 != saa7146_pgtable_build_single(pci, pt, pt->slist, slen))
 187                 goto err_unmap_sg;
 188
 189         return mem;
 190
 191 err_unmap_sg:
 192         dma_unmap_sg(&pci->dev, pt->slist, pt->nents, DMA_FROM_DEVICE);
 193 err_free_pgtable:
 194         saa7146_pgtable_free(pci, pt);
 195 err_free_slist:
 196         kfree(pt->slist);
 197         pt->slist = NULL;
 198 err_free_mem:
 199         vfree(mem);
 200 err_null:
 201         return NULL;
 202 }
 203
 204 void saa7146_vfree_destroy_pgtable(struct pci_dev *pci, void *mem, struct saa7146_pgtable *pt)
 205 {
 206         dma_unmap_sg(&pci->dev, pt->slist, pt->nents, DMA_FROM_DEVICE);
 207         saa7146_pgtable_free(pci, pt);
 208         kfree(pt->slist);
 209         pt->slist = NULL;
 210         vfree(mem);
 211 }
 212
 213 void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
 214 {
 215         if (NULL == pt->cpu)
 216                 return;
 217         dma_free_coherent(&pci->dev, pt->size, pt->cpu, pt->dma);
 218         pt->cpu = NULL;
 219 }
 220
 221 int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
 222 {
 223         __le32       *cpu;
 224         dma_addr_t   dma_addr = 0;
 225
 226         cpu = dma_alloc_coherent(&pci->dev, PAGE_SIZE, &dma_addr, GFP_KERNEL);
 227         if (NULL == cpu) {
 228                 return -ENOMEM;
 229         }
 230         pt->size = PAGE_SIZE;
 231         pt->cpu  = cpu;
 232         pt->dma  = dma_addr;
 233
 234         return 0;
 235 }
 236
 237 int saa7146_pgtable_build_single(struct pci_dev *pci, struct saa7146_pgtable *pt,
 238                                  struct scatterlist *list, int sglen)
 239 {
 240         struct sg_dma_page_iter dma_iter;
 241         __le32 *ptr, fill;
 242         int nr_pages = 0;
 243         int i;
 244
 245         if (WARN_ON(!sglen) ||
 246             WARN_ON(list->offset > PAGE_SIZE))
 247                 return -EIO;
 248
 249         /* if we have a user buffer, the first page may not be
 250            aligned to a page boundary. */
 251         pt->offset = list->offset;
 252
 253         ptr = pt->cpu;
 254         for_each_sg_dma_page(list, &dma_iter, sglen, 0) {
 255                 *ptr++ = cpu_to_le32(sg_page_iter_dma_address(&dma_iter));
 256                 nr_pages++;
 257         }
 258
 259
 260         /* safety; fill the page table up with the last valid page */
 261         fill = *(ptr-1);
 262         for (i = nr_pages; i < 1024; i++)
 263                 *ptr++ = fill;
 264         return 0;
 265 }
 266
 267 /********************************************************************************/
 268 /* interrupt handler */
 269 static irqreturn_t interrupt_hw(int irq, void *dev_id)
 270 {
 271         struct saa7146_dev *dev = dev_id;
 272         u32 isr;
 273         u32 ack_isr;
 274
 275         /* read out the interrupt status register */
 276         ack_isr = isr = saa7146_read(dev, ISR);
 277
 278         /* is this our interrupt? */
 279         if ( 0 == isr ) {
 280                 /* nope, some other device */
 281                 return IRQ_NONE;
 282         }
 283
 284         if (dev->ext) {
 285                 if (dev->ext->irq_mask & isr) {
 286                         if (dev->ext->irq_func)
 287                                 dev->ext->irq_func(dev, &isr);
 288                         isr &= ~dev->ext->irq_mask;
 289                 }
 290         }
 291         if (0 != (isr & (MASK_27))) {
 292                 DEB_INT("irq: RPS0 (0x%08x)\n", isr);
 293                 if (dev->vv_data && dev->vv_callback)
 294                         dev->vv_callback(dev,isr);
 295                 isr &= ~MASK_27;
 296         }
 297         if (0 != (isr & (MASK_28))) {
 298                 if (dev->vv_data && dev->vv_callback)
 299                         dev->vv_callback(dev,isr);
 300                 isr &= ~MASK_28;
 301         }
 302         if (0 != (isr & (MASK_16|MASK_17))) {
 303                 SAA7146_IER_DISABLE(dev, MASK_16|MASK_17);
 304                 /* only wake up if we expect something */
 305                 if (0 != dev->i2c_op) {
 306                         dev->i2c_op = 0;
 307                         wake_up(&dev->i2c_wq);
 308                 } else {
 309                         u32 psr = saa7146_read(dev, PSR);
 310                         u32 ssr = saa7146_read(dev, SSR);
 311                         pr_warn("%s: unexpected i2c irq: isr %08x psr %08x ssr %08x\n",
 312                                 dev->name, isr, psr, ssr);
 313                 }
 314                 isr &= ~(MASK_16|MASK_17);
 315         }
 316         if( 0 != isr ) {
 317                 ERR("warning: interrupt enabled, but not handled properly.(0x%08x)\n",
 318                     isr);
 319                 ERR("disabling interrupt source(s)!\n");
 320                 SAA7146_IER_DISABLE(dev,isr);
 321         }
 322         saa7146_write(dev, ISR, ack_isr);
 323         return IRQ_HANDLED;
 324 }
 325
 326 /*********************************************************************************/
 327 /* configuration-functions                                                       */
 328
 329 static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent)
 330 {
 331         struct saa7146_pci_extension_data *pci_ext = (struct saa7146_pci_extension_data *)ent->driver_data;
 332         struct saa7146_extension *ext = pci_ext->ext;
 333         struct saa7146_dev *dev;
 334         int err = -ENOMEM;
 335
 336         /* clear out mem for sure */
 337         dev = kzalloc(sizeof(struct saa7146_dev), GFP_KERNEL);
 338         if (!dev) {
 339                 ERR("out of memory\n");
 340                 goto out;
 341         }
 342
 343         /* create a nice device name */
 344         sprintf(dev->name, "saa7146 (%d)", saa7146_num);
 345
 346         DEB_EE("pci:%p\n", pci);
 347
 348         err = pci_enable_device(pci);
 349         if (err < 0) {
 350                 ERR("pci_enable_device() failed\n");
 351                 goto err_free;
 352         }
 353
 354         /* enable bus-mastering */
 355         pci_set_master(pci);
 356
 357         dev->pci = pci;
 358
 359         /* get chip-revision; this is needed to enable bug-fixes */
 360         dev->revision = pci->revision;
 361
 362         /* remap the memory from virtual to physical address */
 363
 364         err = pci_request_region(pci, 0, "saa7146");
 365         if (err < 0)
 366                 goto err_disable;
 367
 368         dev->mem = ioremap(pci_resource_start(pci, 0),
 369                            pci_resource_len(pci, 0));
 370         if (!dev->mem) {
 371                 ERR("ioremap() failed\n");
 372                 err = -ENODEV;
 373                 goto err_release;
 374         }
 375
 376         /* we don't do a master reset here anymore, it screws up
 377            some boards that don't have an i2c-eeprom for configuration
 378            values */
 379 /*
 380         saa7146_write(dev, MC1, MASK_31);
 381 */
 382
 383         /* disable all irqs */
 384         saa7146_write(dev, IER, 0);
 385
 386         /* shut down all dma transfers and rps tasks */
 387         saa7146_write(dev, MC1, 0x30ff0000);
 388
 389         /* clear out any rps-signals pending */
 390         saa7146_write(dev, MC2, 0xf8000000);
 391
 392         /* request an interrupt for the saa7146 */
 393         err = request_irq(pci->irq, interrupt_hw, IRQF_SHARED,
 394                           dev->name, dev);
 395         if (err < 0) {
 396                 ERR("request_irq() failed\n");
 397                 goto err_unmap;
 398         }
 399
 400         err = -ENOMEM;
 401
 402         /* get memory for various stuff */
 403         dev->d_rps0.cpu_addr = dma_alloc_coherent(&pci->dev, SAA7146_RPS_MEM,
 404                                                   &dev->d_rps0.dma_handle,
 405                                                   GFP_KERNEL);
 406         if (!dev->d_rps0.cpu_addr)
 407                 goto err_free_irq;
 408
 409         dev->d_rps1.cpu_addr = dma_alloc_coherent(&pci->dev, SAA7146_RPS_MEM,
 410                                                   &dev->d_rps1.dma_handle,
 411                                                   GFP_KERNEL);
 412         if (!dev->d_rps1.cpu_addr)
 413                 goto err_free_rps0;
 414
 415         dev->d_i2c.cpu_addr = dma_alloc_coherent(&pci->dev, SAA7146_RPS_MEM,
 416                                                  &dev->d_i2c.dma_handle, GFP_KERNEL);
 417         if (!dev->d_i2c.cpu_addr)
 418                 goto err_free_rps1;
 419
 420         /* the rest + print status message */
 421
 422         pr_info("found saa7146 @ mem %p (revision %d, irq %d) (0x%04x,0x%04x)\n",
 423                 dev->mem, dev->revision, pci->irq,
 424                 pci->subsystem_vendor, pci->subsystem_device);
 425         dev->ext = ext;
 426
 427         mutex_init(&dev->v4l2_lock);
 428         spin_lock_init(&dev->int_slock);
 429         spin_lock_init(&dev->slock);
 430
 431         mutex_init(&dev->i2c_lock);
 432
 433         dev->module = THIS_MODULE;
 434         init_waitqueue_head(&dev->i2c_wq);
 435
 436         /* set some sane pci arbitrition values */
 437         saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
 438
 439         /* TODO: use the status code of the callback */
 440
 441         err = -ENODEV;
 442
 443         if (ext->probe && ext->probe(dev)) {
 444                 DEB_D("ext->probe() failed for %p. skipping device.\n", dev);
 445                 goto err_free_i2c;
 446         }
 447
 448         if (ext->attach(dev, pci_ext)) {
 449                 DEB_D("ext->attach() failed for %p. skipping device.\n", dev);
 450                 goto err_free_i2c;
 451         }
 452         /* V4L extensions will set the pci drvdata to the v4l2_device in the
 453            attach() above. So for those cards that do not use V4L we have to
 454            set it explicitly. */
 455         pci_set_drvdata(pci, &dev->v4l2_dev);
 456
 457         saa7146_num++;
 458
 459         err = 0;
 460 out:
 461         return err;
 462
 463 err_free_i2c:
 464         dma_free_coherent(&pci->dev, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
 465                           dev->d_i2c.dma_handle);
 466 err_free_rps1:
 467         dma_free_coherent(&pci->dev, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
 468                           dev->d_rps1.dma_handle);
 469 err_free_rps0:
 470         dma_free_coherent(&pci->dev, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
 471                           dev->d_rps0.dma_handle);
 472 err_free_irq:
 473         free_irq(pci->irq, (void *)dev);
 474 err_unmap:
 475         iounmap(dev->mem);
 476 err_release:
 477         pci_release_region(pci, 0);
 478 err_disable:
 479         pci_disable_device(pci);
 480 err_free:
 481         kfree(dev);
 482         goto out;
 483 }
 484
 485 static void saa7146_remove_one(struct pci_dev *pdev)
 486 {
 487         struct v4l2_device *v4l2_dev = pci_get_drvdata(pdev);
 488         struct saa7146_dev *dev = to_saa7146_dev(v4l2_dev);
 489         struct {
 490                 void *addr;
 491                 dma_addr_t dma;
 492         } dev_map[] = {
 493                 { dev->d_i2c.cpu_addr, dev->d_i2c.dma_handle },
 494                 { dev->d_rps1.cpu_addr, dev->d_rps1.dma_handle },
 495                 { dev->d_rps0.cpu_addr, dev->d_rps0.dma_handle },
 496                 { NULL, 0 }
 497         }, *p;
 498
 499         DEB_EE("dev:%p\n", dev);
 500
 501         dev->ext->detach(dev);
 502
 503         /* shut down all video dma transfers */
 504         saa7146_write(dev, MC1, 0x00ff0000);
 505
 506         /* disable all irqs, release irq-routine */
 507         saa7146_write(dev, IER, 0);
 508
 509         free_irq(pdev->irq, dev);
 510
 511         for (p = dev_map; p->addr; p++)
 512                 dma_free_coherent(&pdev->dev, SAA7146_RPS_MEM, p->addr,
 513                                   p->dma);
 514
 515         iounmap(dev->mem);
 516         pci_release_region(pdev, 0);
 517         pci_disable_device(pdev);
 518         kfree(dev);
 519
 520         saa7146_num--;
 521 }
 522
 523 /*********************************************************************************/
 524 /* extension handling functions                                                  */
 525
 526 int saa7146_register_extension(struct saa7146_extension* ext)
 527 {
 528         DEB_EE("ext:%p\n", ext);
 529
 530         ext->driver.name = ext->name;
 531         ext->driver.id_table = ext->pci_tbl;
 532         ext->driver.probe = saa7146_init_one;
 533         ext->driver.remove = saa7146_remove_one;
 534
 535         pr_info("register extension '%s'\n", ext->name);
 536         return pci_register_driver(&ext->driver);
 537 }
 538
 539 int saa7146_unregister_extension(struct saa7146_extension* ext)
 540 {
 541         DEB_EE("ext:%p\n", ext);
 542         pr_info("unregister extension '%s'\n", ext->name);
 543         pci_unregister_driver(&ext->driver);
 544         return 0;
 545 }
 546
 547 EXPORT_SYMBOL_GPL(saa7146_register_extension);
 548 EXPORT_SYMBOL_GPL(saa7146_unregister_extension);
 549
 550 /* misc functions used by extension modules */
 551 EXPORT_SYMBOL_GPL(saa7146_pgtable_alloc);
 552 EXPORT_SYMBOL_GPL(saa7146_pgtable_free);
 553 EXPORT_SYMBOL_GPL(saa7146_pgtable_build_single);
 554 EXPORT_SYMBOL_GPL(saa7146_vmalloc_build_pgtable);
 555 EXPORT_SYMBOL_GPL(saa7146_vfree_destroy_pgtable);
 556 EXPORT_SYMBOL_GPL(saa7146_wait_for_debi_done);
 557
 558 EXPORT_SYMBOL_GPL(saa7146_setgpio);
 559
 560 EXPORT_SYMBOL_GPL(saa7146_i2c_adapter_prepare);
 561
 562 EXPORT_SYMBOL_GPL(saa7146_debug);
 563
 564 MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
 565 MODULE_DESCRIPTION("driver for generic saa7146-based hardware");
 566 MODULE_LICENSE("GPL");