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