git.oblomov.eu Git - linux-2.6/blob - drivers/char/drm/mga_dma.c

   1 /* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
   2  * Created: Mon Dec 13 01:50:01 1999 by jhartmann@precisioninsight.com
   3  *
   4  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   6  * All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the next
  16  * paragraph) shall be included in all copies or substantial portions of the
  17  * Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  25  * DEALINGS IN THE SOFTWARE.
  26  */
  27
  28 /**
  29  * \file mga_dma.c
  30  * DMA support for MGA G200 / G400.
  31  *
  32  * \author Rickard E. (Rik) Faith <faith@valinux.com>
  33  * \author Jeff Hartmann <jhartmann@valinux.com>
  34  * \author Keith Whitwell <keith@tungstengraphics.com>
  35  * \author Gareth Hughes <gareth@valinux.com>
  36  */
  37
  38 #include "drmP.h"
  39 #include "drm.h"
  40 #include "drm_sarea.h"
  41 #include "mga_drm.h"
  42 #include "mga_drv.h"
  43
  44 #define MGA_DEFAULT_USEC_TIMEOUT        10000
  45 #define MGA_FREELIST_DEBUG              0
  46
  47 static int mga_do_cleanup_dma( drm_device_t *dev );
  48
  49 /* ================================================================
  50  * Engine control
  51  */
  52
  53 int mga_do_wait_for_idle( drm_mga_private_t *dev_priv )
  54 {
  55         u32 status = 0;
  56         int i;
  57         DRM_DEBUG( "\n" );
  58
  59         for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
  60                 status = MGA_READ( MGA_STATUS ) & MGA_ENGINE_IDLE_MASK;
  61                 if ( status == MGA_ENDPRDMASTS ) {
  62                         MGA_WRITE8( MGA_CRTC_INDEX, 0 );
  63                         return 0;
  64                 }
  65                 DRM_UDELAY( 1 );
  66         }
  67
  68 #if MGA_DMA_DEBUG
  69         DRM_ERROR( "failed!\n" );
  70         DRM_INFO( "   status=0x%08x\n", status );
  71 #endif
  72         return DRM_ERR(EBUSY);
  73 }
  74
  75 static int mga_do_dma_reset( drm_mga_private_t *dev_priv )
  76 {
  77         drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
  78         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
  79
  80         DRM_DEBUG( "\n" );
  81
  82         /* The primary DMA stream should look like new right about now.
  83          */
  84         primary->tail = 0;
  85         primary->space = primary->size;
  86         primary->last_flush = 0;
  87
  88         sarea_priv->last_wrap = 0;
  89
  90         /* FIXME: Reset counters, buffer ages etc...
  91          */
  92
  93         /* FIXME: What else do we need to reinitialize?  WARP stuff?
  94          */
  95
  96         return 0;
  97 }
  98
  99 /* ================================================================
 100  * Primary DMA stream
 101  */
 102
 103 void mga_do_dma_flush( drm_mga_private_t *dev_priv )
 104 {
 105         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 106         u32 head, tail;
 107         u32 status = 0;
 108         int i;
 109         DMA_LOCALS;
 110         DRM_DEBUG( "\n" );
 111
 112         /* We need to wait so that we can do an safe flush */
 113         for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
 114                 status = MGA_READ( MGA_STATUS ) & MGA_ENGINE_IDLE_MASK;
 115                 if ( status == MGA_ENDPRDMASTS ) break;
 116                 DRM_UDELAY( 1 );
 117         }
 118
 119         if ( primary->tail == primary->last_flush ) {
 120                 DRM_DEBUG( "   bailing out...\n" );
 121                 return;
 122         }
 123
 124         tail = primary->tail + dev_priv->primary->offset;
 125
 126         /* We need to pad the stream between flushes, as the card
 127          * actually (partially?) reads the first of these commands.
 128          * See page 4-16 in the G400 manual, middle of the page or so.
 129          */
 130         BEGIN_DMA( 1 );
 131
 132         DMA_BLOCK( MGA_DMAPAD,  0x00000000,
 133                    MGA_DMAPAD,  0x00000000,
 134                    MGA_DMAPAD,  0x00000000,
 135                    MGA_DMAPAD,  0x00000000 );
 136
 137         ADVANCE_DMA();
 138
 139         primary->last_flush = primary->tail;
 140
 141         head = MGA_READ( MGA_PRIMADDRESS );
 142
 143         if ( head <= tail ) {
 144                 primary->space = primary->size - primary->tail;
 145         } else {
 146                 primary->space = head - tail;
 147         }
 148
 149         DRM_DEBUG( "   head = 0x%06lx\n", head - dev_priv->primary->offset );
 150         DRM_DEBUG( "   tail = 0x%06lx\n", tail - dev_priv->primary->offset );
 151         DRM_DEBUG( "  space = 0x%06x\n", primary->space );
 152
 153         mga_flush_write_combine();
 154         MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);
 155
 156         DRM_DEBUG( "done.\n" );
 157 }
 158
 159 void mga_do_dma_wrap_start( drm_mga_private_t *dev_priv )
 160 {
 161         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 162         u32 head, tail;
 163         DMA_LOCALS;
 164         DRM_DEBUG( "\n" );
 165
 166         BEGIN_DMA_WRAP();
 167
 168         DMA_BLOCK( MGA_DMAPAD,  0x00000000,
 169                    MGA_DMAPAD,  0x00000000,
 170                    MGA_DMAPAD,  0x00000000,
 171                    MGA_DMAPAD,  0x00000000 );
 172
 173         ADVANCE_DMA();
 174
 175         tail = primary->tail + dev_priv->primary->offset;
 176
 177         primary->tail = 0;
 178         primary->last_flush = 0;
 179         primary->last_wrap++;
 180
 181         head = MGA_READ( MGA_PRIMADDRESS );
 182
 183         if ( head == dev_priv->primary->offset ) {
 184                 primary->space = primary->size;
 185         } else {
 186                 primary->space = head - dev_priv->primary->offset;
 187         }
 188
 189         DRM_DEBUG( "   head = 0x%06lx\n",
 190                   head - dev_priv->primary->offset );
 191         DRM_DEBUG( "   tail = 0x%06x\n", primary->tail );
 192         DRM_DEBUG( "   wrap = %d\n", primary->last_wrap );
 193         DRM_DEBUG( "  space = 0x%06x\n", primary->space );
 194
 195         mga_flush_write_combine();
 196         MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);
 197
 198         set_bit( 0, &primary->wrapped );
 199         DRM_DEBUG( "done.\n" );
 200 }
 201
 202 void mga_do_dma_wrap_end( drm_mga_private_t *dev_priv )
 203 {
 204         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 205         drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
 206         u32 head = dev_priv->primary->offset;
 207         DRM_DEBUG( "\n" );
 208
 209         sarea_priv->last_wrap++;
 210         DRM_DEBUG( "   wrap = %d\n", sarea_priv->last_wrap );
 211
 212         mga_flush_write_combine();
 213         MGA_WRITE( MGA_PRIMADDRESS, head | MGA_DMA_GENERAL );
 214
 215         clear_bit( 0, &primary->wrapped );
 216         DRM_DEBUG( "done.\n" );
 217 }
 218
 219
 220 /* ================================================================
 221  * Freelist management
 222  */
 223
 224 #define MGA_BUFFER_USED         ~0
 225 #define MGA_BUFFER_FREE         0
 226
 227 #if MGA_FREELIST_DEBUG
 228 static void mga_freelist_print( drm_device_t *dev )
 229 {
 230         drm_mga_private_t *dev_priv = dev->dev_private;
 231         drm_mga_freelist_t *entry;
 232
 233         DRM_INFO( "\n" );
 234         DRM_INFO( "current dispatch: last=0x%x done=0x%x\n",
 235                   dev_priv->sarea_priv->last_dispatch,
 236                   (unsigned int)(MGA_READ( MGA_PRIMADDRESS ) -
 237                                  dev_priv->primary->offset) );
 238         DRM_INFO( "current freelist:\n" );
 239
 240         for ( entry = dev_priv->head->next ; entry ; entry = entry->next ) {
 241                 DRM_INFO( "   %p   idx=%2d  age=0x%x 0x%06lx\n",
 242                           entry, entry->buf->idx, entry->age.head,
 243                           entry->age.head - dev_priv->primary->offset );
 244         }
 245         DRM_INFO( "\n" );
 246 }
 247 #endif
 248
 249 static int mga_freelist_init( drm_device_t *dev, drm_mga_private_t *dev_priv )
 250 {
 251         drm_device_dma_t *dma = dev->dma;
 252         drm_buf_t *buf;
 253         drm_mga_buf_priv_t *buf_priv;
 254         drm_mga_freelist_t *entry;
 255         int i;
 256         DRM_DEBUG( "count=%d\n", dma->buf_count );
 257
 258         dev_priv->head = drm_alloc( sizeof(drm_mga_freelist_t),
 259                                      DRM_MEM_DRIVER );
 260         if ( dev_priv->head == NULL )
 261                 return DRM_ERR(ENOMEM);
 262
 263         memset( dev_priv->head, 0, sizeof(drm_mga_freelist_t) );
 264         SET_AGE( &dev_priv->head->age, MGA_BUFFER_USED, 0 );
 265
 266         for ( i = 0 ; i < dma->buf_count ; i++ ) {
 267                 buf = dma->buflist[i];
 268                 buf_priv = buf->dev_private;
 269
 270                 entry = drm_alloc( sizeof(drm_mga_freelist_t),
 271                                     DRM_MEM_DRIVER );
 272                 if ( entry == NULL )
 273                         return DRM_ERR(ENOMEM);
 274
 275                 memset( entry, 0, sizeof(drm_mga_freelist_t) );
 276
 277                 entry->next = dev_priv->head->next;
 278                 entry->prev = dev_priv->head;
 279                 SET_AGE( &entry->age, MGA_BUFFER_FREE, 0 );
 280                 entry->buf = buf;
 281
 282                 if ( dev_priv->head->next != NULL )
 283                         dev_priv->head->next->prev = entry;
 284                 if ( entry->next == NULL )
 285                         dev_priv->tail = entry;
 286
 287                 buf_priv->list_entry = entry;
 288                 buf_priv->discard = 0;
 289                 buf_priv->dispatched = 0;
 290
 291                 dev_priv->head->next = entry;
 292         }
 293
 294         return 0;
 295 }
 296
 297 static void mga_freelist_cleanup( drm_device_t *dev )
 298 {
 299         drm_mga_private_t *dev_priv = dev->dev_private;
 300         drm_mga_freelist_t *entry;
 301         drm_mga_freelist_t *next;
 302         DRM_DEBUG( "\n" );
 303
 304         entry = dev_priv->head;
 305         while ( entry ) {
 306                 next = entry->next;
 307                 drm_free( entry, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER );
 308                 entry = next;
 309         }
 310
 311         dev_priv->head = dev_priv->tail = NULL;
 312 }
 313
 314 #if 0
 315 /* FIXME: Still needed?
 316  */
 317 static void mga_freelist_reset( drm_device_t *dev )
 318 {
 319         drm_device_dma_t *dma = dev->dma;
 320         drm_buf_t *buf;
 321         drm_mga_buf_priv_t *buf_priv;
 322         int i;
 323
 324         for ( i = 0 ; i < dma->buf_count ; i++ ) {
 325                 buf = dma->buflist[i];
 326                 buf_priv = buf->dev_private;
 327                 SET_AGE( &buf_priv->list_entry->age,
 328                          MGA_BUFFER_FREE, 0 );
 329         }
 330 }
 331 #endif
 332
 333 static drm_buf_t *mga_freelist_get( drm_device_t *dev )
 334 {
 335         drm_mga_private_t *dev_priv = dev->dev_private;
 336         drm_mga_freelist_t *next;
 337         drm_mga_freelist_t *prev;
 338         drm_mga_freelist_t *tail = dev_priv->tail;
 339         u32 head, wrap;
 340         DRM_DEBUG( "\n" );
 341
 342         head = MGA_READ( MGA_PRIMADDRESS );
 343         wrap = dev_priv->sarea_priv->last_wrap;
 344
 345         DRM_DEBUG( "   tail=0x%06lx %d\n",
 346                    tail->age.head ?
 347                    tail->age.head - dev_priv->primary->offset : 0,
 348                    tail->age.wrap );
 349         DRM_DEBUG( "   head=0x%06lx %d\n",
 350                    head - dev_priv->primary->offset, wrap );
 351
 352         if ( TEST_AGE( &tail->age, head, wrap ) ) {
 353                 prev = dev_priv->tail->prev;
 354                 next = dev_priv->tail;
 355                 prev->next = NULL;
 356                 next->prev = next->next = NULL;
 357                 dev_priv->tail = prev;
 358                 SET_AGE( &next->age, MGA_BUFFER_USED, 0 );
 359                 return next->buf;
 360         }
 361
 362         DRM_DEBUG( "returning NULL!\n" );
 363         return NULL;
 364 }
 365
 366 int mga_freelist_put( drm_device_t *dev, drm_buf_t *buf )
 367 {
 368         drm_mga_private_t *dev_priv = dev->dev_private;
 369         drm_mga_buf_priv_t *buf_priv = buf->dev_private;
 370         drm_mga_freelist_t *head, *entry, *prev;
 371
 372         DRM_DEBUG( "age=0x%06lx wrap=%d\n",
 373                    buf_priv->list_entry->age.head -
 374                    dev_priv->primary->offset,
 375                    buf_priv->list_entry->age.wrap );
 376
 377         entry = buf_priv->list_entry;
 378         head = dev_priv->head;
 379
 380         if ( buf_priv->list_entry->age.head == MGA_BUFFER_USED ) {
 381                 SET_AGE( &entry->age, MGA_BUFFER_FREE, 0 );
 382                 prev = dev_priv->tail;
 383                 prev->next = entry;
 384                 entry->prev = prev;
 385                 entry->next = NULL;
 386         } else {
 387                 prev = head->next;
 388                 head->next = entry;
 389                 prev->prev = entry;
 390                 entry->prev = head;
 391                 entry->next = prev;
 392         }
 393
 394         return 0;
 395 }
 396
 397
 398 /* ================================================================
 399  * DMA initialization, cleanup
 400  */
 401
 402
 403 int mga_driver_preinit(drm_device_t *dev, unsigned long flags)
 404 {
 405         drm_mga_private_t * dev_priv;
 406
 407         dev_priv = drm_alloc(sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
 408         if (!dev_priv)
 409                 return DRM_ERR(ENOMEM);
 410
 411         dev->dev_private = (void *)dev_priv;
 412         memset(dev_priv, 0, sizeof(drm_mga_private_t));
 413
 414         dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
 415         dev_priv->chipset = flags;
 416
 417         return 0;
 418 }
 419
 420 #if __OS_HAS_AGP
 421 /**
 422  * Bootstrap the driver for AGP DMA.
 423  *
 424  * \todo
 425  * Investigate whether there is any benifit to storing the WARP microcode in
 426  * AGP memory.  If not, the microcode may as well always be put in PCI
 427  * memory.
 428  *
 429  * \todo
 430  * This routine needs to set dma_bs->agp_mode to the mode actually configured
 431  * in the hardware.  Looking just at the Linux AGP driver code, I don't see
 432  * an easy way to determine this.
 433  *
 434  * \sa mga_do_dma_bootstrap, mga_do_pci_dma_bootstrap
 435  */
 436 static int mga_do_agp_dma_bootstrap(drm_device_t * dev,
 437                                     drm_mga_dma_bootstrap_t * dma_bs)
 438 {
 439         drm_mga_private_t * const dev_priv = (drm_mga_private_t *) dev->dev_private;
 440         const unsigned int warp_size = mga_warp_microcode_size(dev_priv);
 441         int err;
 442         unsigned  offset;
 443         const unsigned secondary_size = dma_bs->secondary_bin_count
 444                 * dma_bs->secondary_bin_size;
 445         const unsigned agp_size = (dma_bs->agp_size << 20);
 446         drm_buf_desc_t req;
 447         drm_agp_mode_t mode;
 448         drm_agp_info_t info;
 449
 450
 451         /* Acquire AGP. */
 452         err = drm_agp_acquire(dev);
 453         if (err) {
 454                 DRM_ERROR("Unable to acquire AGP\n");
 455                 return err;
 456         }
 457
 458         err = drm_agp_info(dev, &info);
 459         if (err) {
 460                 DRM_ERROR("Unable to get AGP info\n");
 461                 return err;
 462         }
 463
 464         mode.mode = (info.mode & ~0x07) | dma_bs->agp_mode;
 465         err = drm_agp_enable(dev, mode);
 466         if (err) {
 467                 DRM_ERROR("Unable to enable AGP (mode = 0x%lx)\n", mode.mode);
 468                 return err;
 469         }
 470
 471
 472         /* In addition to the usual AGP mode configuration, the G200 AGP cards
 473          * need to have the AGP mode "manually" set.
 474          */
 475
 476         if (dev_priv->chipset == MGA_CARD_TYPE_G200) {
 477                 if (mode.mode & 0x02) {
 478                         MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_ENABLE);
 479                 }
 480                 else {
 481                         MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_DISABLE);
 482                 }
 483         }
 484
 485
 486         /* Allocate and bind AGP memory. */
 487         dev_priv->agp_pages = agp_size / PAGE_SIZE;
 488         dev_priv->agp_mem = drm_alloc_agp( dev, dev_priv->agp_pages, 0 );
 489         if (dev_priv->agp_mem == NULL) {
 490                 dev_priv->agp_pages = 0;
 491                 DRM_ERROR("Unable to allocate %uMB AGP memory\n",
 492                           dma_bs->agp_size);
 493                 return DRM_ERR(ENOMEM);
 494         }
 495
 496         err = drm_bind_agp( dev_priv->agp_mem, 0 );
 497         if (err) {
 498                 DRM_ERROR("Unable to bind AGP memory\n");
 499                 return err;
 500         }
 501
 502         offset = 0;
 503         err = drm_addmap( dev, offset, warp_size,
 504                           _DRM_AGP, _DRM_READ_ONLY, & dev_priv->warp );
 505         if (err) {
 506                 DRM_ERROR("Unable to map WARP microcode\n");
 507                 return err;
 508         }
 509
 510         offset += warp_size;
 511         err = drm_addmap( dev, offset, dma_bs->primary_size,
 512                           _DRM_AGP, _DRM_READ_ONLY, & dev_priv->primary );
 513         if (err) {
 514                 DRM_ERROR("Unable to map primary DMA region\n");
 515                 return err;
 516         }
 517
 518         offset += dma_bs->primary_size;
 519         err = drm_addmap( dev, offset, secondary_size,
 520                           _DRM_AGP, 0, & dev->agp_buffer_map );
 521         if (err) {
 522                 DRM_ERROR("Unable to map secondary DMA region\n");
 523                 return err;
 524         }
 525
 526         (void) memset( &req, 0, sizeof(req) );
 527         req.count = dma_bs->secondary_bin_count;
 528         req.size = dma_bs->secondary_bin_size;
 529         req.flags = _DRM_AGP_BUFFER;
 530         req.agp_start = offset;
 531
 532         err = drm_addbufs_agp( dev, & req );
 533         if (err) {
 534                 DRM_ERROR("Unable to add secondary DMA buffers\n");
 535                 return err;
 536         }
 537
 538         offset += secondary_size;
 539         err = drm_addmap( dev, offset, agp_size - offset,
 540                           _DRM_AGP, 0, & dev_priv->agp_textures );
 541         if (err) {
 542                 DRM_ERROR("Unable to map AGP texture region\n");
 543                 return err;
 544         }
 545
 546         drm_core_ioremap(dev_priv->warp, dev);
 547         drm_core_ioremap(dev_priv->primary, dev);
 548         drm_core_ioremap(dev->agp_buffer_map, dev);
 549
 550         if (!dev_priv->warp->handle ||
 551             !dev_priv->primary->handle || !dev->agp_buffer_map->handle) {
 552                 DRM_ERROR("failed to ioremap agp regions! (%p, %p, %p)\n",
 553                           dev_priv->warp->handle, dev_priv->primary->handle,
 554                           dev->agp_buffer_map->handle);
 555                 return DRM_ERR(ENOMEM);
 556         }
 557
 558         dev_priv->dma_access = MGA_PAGPXFER;
 559         dev_priv->wagp_enable = MGA_WAGP_ENABLE;
 560
 561         DRM_INFO("Initialized card for AGP DMA.\n");
 562         return 0;
 563 }
 564 #else
 565 static int mga_do_agp_dma_bootstrap(drm_device_t * dev,
 566                                     drm_mga_dma_bootstrap_t * dma_bs)
 567 {
 568         return -EINVAL;
 569 }
 570 #endif
 571
 572 /**
 573  * Bootstrap the driver for PCI DMA.
 574  *
 575  * \todo
 576  * The algorithm for decreasing the size of the primary DMA buffer could be
 577  * better.  The size should be rounded up to the nearest page size, then
 578  * decrease the request size by a single page each pass through the loop.
 579  *
 580  * \todo
 581  * Determine whether the maximum address passed to drm_pci_alloc is correct.
 582  * The same goes for drm_addbufs_pci.
 583  *
 584  * \sa mga_do_dma_bootstrap, mga_do_agp_dma_bootstrap
 585  */
 586 static int mga_do_pci_dma_bootstrap(drm_device_t * dev,
 587                                     drm_mga_dma_bootstrap_t * dma_bs)
 588 {
 589         drm_mga_private_t * const dev_priv = (drm_mga_private_t *) dev->dev_private;
 590         const unsigned int warp_size = mga_warp_microcode_size(dev_priv);
 591         unsigned int primary_size;
 592         unsigned int bin_count;
 593         int err;
 594         drm_buf_desc_t req;
 595
 596
 597         if (dev->dma == NULL) {
 598                 DRM_ERROR("dev->dma is NULL\n");
 599                 return DRM_ERR(EFAULT);
 600         }
 601
 602         /* The proper alignment is 0x100 for this mapping */
 603         err = drm_addmap(dev, 0, warp_size, _DRM_CONSISTENT,
 604                          _DRM_READ_ONLY, &dev_priv->warp);
 605         if (err != 0) {
 606                 DRM_ERROR("Unable to create mapping for WARP microcode\n");
 607                 return err;
 608         }
 609
 610         /* Other than the bottom two bits being used to encode other
 611          * information, there don't appear to be any restrictions on the
 612          * alignment of the primary or secondary DMA buffers.
 613          */
 614
 615         for ( primary_size = dma_bs->primary_size
 616               ; primary_size != 0
 617               ; primary_size >>= 1 ) {
 618                 /* The proper alignment for this mapping is 0x04 */
 619                 err = drm_addmap(dev, 0, primary_size, _DRM_CONSISTENT,
 620                                  _DRM_READ_ONLY, &dev_priv->primary);
 621                 if (!err)
 622                         break;
 623         }
 624
 625         if (err != 0) {
 626                 DRM_ERROR("Unable to allocate primary DMA region\n");
 627                 return DRM_ERR(ENOMEM);
 628         }
 629
 630         if (dev_priv->primary->size != dma_bs->primary_size) {
 631                 DRM_INFO("Primary DMA buffer size reduced from %u to %u.\n",
 632                          dma_bs->primary_size,
 633                          (unsigned) dev_priv->primary->size);
 634                 dma_bs->primary_size = dev_priv->primary->size;
 635         }
 636
 637         for ( bin_count = dma_bs->secondary_bin_count
 638               ; bin_count > 0
 639               ; bin_count-- ) {
 640                 (void) memset( &req, 0, sizeof(req) );
 641                 req.count = bin_count;
 642                 req.size = dma_bs->secondary_bin_size;
 643
 644                 err = drm_addbufs_pci( dev, & req );
 645                 if (!err) {
 646                         break;
 647                 }
 648         }
 649
 650         if (bin_count == 0) {
 651                 DRM_ERROR("Unable to add secondary DMA buffers\n");
 652                 return err;
 653         }
 654
 655         if (bin_count != dma_bs->secondary_bin_count) {
 656                 DRM_INFO("Secondary PCI DMA buffer bin count reduced from %u "
 657                          "to %u.\n", dma_bs->secondary_bin_count, bin_count);
 658
 659                 dma_bs->secondary_bin_count = bin_count;
 660         }
 661
 662         dev_priv->dma_access = 0;
 663         dev_priv->wagp_enable = 0;
 664
 665         dma_bs->agp_mode = 0;
 666
 667         DRM_INFO("Initialized card for PCI DMA.\n");
 668         return 0;
 669 }
 670
 671
 672 static int mga_do_dma_bootstrap(drm_device_t * dev,
 673                                 drm_mga_dma_bootstrap_t * dma_bs)
 674 {
 675         const int is_agp = (dma_bs->agp_mode != 0) && drm_device_is_agp(dev);
 676         int err;
 677         drm_mga_private_t * const dev_priv =
 678                 (drm_mga_private_t *) dev->dev_private;
 679
 680
 681         dev_priv->used_new_dma_init = 1;
 682
 683         /* The first steps are the same for both PCI and AGP based DMA.  Map
 684          * the cards MMIO registers and map a status page.
 685          */
 686         err = drm_addmap( dev, dev_priv->mmio_base, dev_priv->mmio_size,
 687                           _DRM_REGISTERS, _DRM_READ_ONLY, & dev_priv->mmio );
 688         if (err) {
 689                 DRM_ERROR("Unable to map MMIO region\n");
 690                 return err;
 691         }
 692
 693
 694         err = drm_addmap( dev, 0, SAREA_MAX, _DRM_SHM,
 695                           _DRM_READ_ONLY | _DRM_LOCKED | _DRM_KERNEL,
 696                           & dev_priv->status );
 697         if (err) {
 698                 DRM_ERROR("Unable to map status region\n");
 699                 return err;
 700         }
 701
 702
 703         /* The DMA initialization procedure is slightly different for PCI and
 704          * AGP cards.  AGP cards just allocate a large block of AGP memory and
 705          * carve off portions of it for internal uses.  The remaining memory
 706          * is returned to user-mode to be used for AGP textures.
 707          */
 708         if (is_agp) {
 709                 err = mga_do_agp_dma_bootstrap(dev, dma_bs);
 710         }
 711
 712         /* If we attempted to initialize the card for AGP DMA but failed,
 713          * clean-up any mess that may have been created.
 714          */
 715
 716         if (err) {
 717                 mga_do_cleanup_dma(dev);
 718         }
 719
 720
 721         /* Not only do we want to try and initialized PCI cards for PCI DMA,
 722          * but we also try to initialized AGP cards that could not be
 723          * initialized for AGP DMA.  This covers the case where we have an AGP
 724          * card in a system with an unsupported AGP chipset.  In that case the
 725          * card will be detected as AGP, but we won't be able to allocate any
 726          * AGP memory, etc.
 727          */
 728
 729         if (!is_agp || err) {
 730                 err = mga_do_pci_dma_bootstrap(dev, dma_bs);
 731         }
 732
 733
 734         return err;
 735 }
 736
 737 int mga_dma_bootstrap(DRM_IOCTL_ARGS)
 738 {
 739         DRM_DEVICE;
 740         drm_mga_dma_bootstrap_t bootstrap;
 741         int err;
 742
 743
 744         DRM_COPY_FROM_USER_IOCTL(bootstrap,
 745                                  (drm_mga_dma_bootstrap_t __user *) data,
 746                                  sizeof(bootstrap));
 747
 748         err = mga_do_dma_bootstrap(dev, & bootstrap);
 749         if (! err) {
 750                 static const int modes[] = { 0, 1, 2, 2, 4, 4, 4, 4 };
 751                 const drm_mga_private_t * const dev_priv =
 752                         (drm_mga_private_t *) dev->dev_private;
 753
 754                 if (dev_priv->agp_textures != NULL) {
 755                         bootstrap.texture_handle = dev_priv->agp_textures->offset;
 756                         bootstrap.texture_size = dev_priv->agp_textures->size;
 757                 }
 758                 else {
 759                         bootstrap.texture_handle = 0;
 760                         bootstrap.texture_size = 0;
 761                 }
 762
 763                 bootstrap.agp_mode = modes[ bootstrap.agp_mode & 0x07 ];
 764                 if (DRM_COPY_TO_USER( (void __user *) data, & bootstrap,
 765                                      sizeof(bootstrap))) {
 766                         err = DRM_ERR(EFAULT);
 767                 }
 768         }
 769         else {
 770                 mga_do_cleanup_dma(dev);
 771         }
 772
 773         return err;
 774 }
 775
 776 static int mga_do_init_dma( drm_device_t *dev, drm_mga_init_t *init )
 777 {
 778         drm_mga_private_t *dev_priv;
 779         int ret;
 780         DRM_DEBUG( "\n" );
 781
 782
 783         dev_priv = dev->dev_private;
 784
 785         if (init->sgram) {
 786                 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
 787         } else {
 788                 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
 789         }
 790         dev_priv->maccess       = init->maccess;
 791
 792         dev_priv->fb_cpp        = init->fb_cpp;
 793         dev_priv->front_offset  = init->front_offset;
 794         dev_priv->front_pitch   = init->front_pitch;
 795         dev_priv->back_offset   = init->back_offset;
 796         dev_priv->back_pitch    = init->back_pitch;
 797
 798         dev_priv->depth_cpp     = init->depth_cpp;
 799         dev_priv->depth_offset  = init->depth_offset;
 800         dev_priv->depth_pitch   = init->depth_pitch;
 801
 802         /* FIXME: Need to support AGP textures...
 803          */
 804         dev_priv->texture_offset = init->texture_offset[0];
 805         dev_priv->texture_size = init->texture_size[0];
 806
 807         DRM_GETSAREA();
 808
 809         if (!dev_priv->sarea) {
 810                 DRM_ERROR("failed to find sarea!\n");
 811                 return DRM_ERR(EINVAL);
 812         }
 813
 814         if (! dev_priv->used_new_dma_init) {
 815                 dev_priv->status = drm_core_findmap(dev, init->status_offset);
 816                 if (!dev_priv->status) {
 817                         DRM_ERROR("failed to find status page!\n");
 818                         return DRM_ERR(EINVAL);
 819                 }
 820                 dev_priv->mmio = drm_core_findmap(dev, init->mmio_offset);
 821                 if (!dev_priv->mmio) {
 822                         DRM_ERROR("failed to find mmio region!\n");
 823                         return DRM_ERR(EINVAL);
 824                 }
 825                 dev_priv->warp = drm_core_findmap(dev, init->warp_offset);
 826                 if (!dev_priv->warp) {
 827                         DRM_ERROR("failed to find warp microcode region!\n");
 828                         return DRM_ERR(EINVAL);
 829                 }
 830                 dev_priv->primary = drm_core_findmap(dev, init->primary_offset);
 831                 if (!dev_priv->primary) {
 832                         DRM_ERROR("failed to find primary dma region!\n");
 833                         return DRM_ERR(EINVAL);
 834                 }
 835                 dev->agp_buffer_token = init->buffers_offset;
 836                 dev->agp_buffer_map = drm_core_findmap(dev, init->buffers_offset);
 837                 if (!dev->agp_buffer_map) {
 838                         DRM_ERROR("failed to find dma buffer region!\n");
 839                         return DRM_ERR(EINVAL);
 840                 }
 841
 842                 drm_core_ioremap(dev_priv->warp, dev);
 843                 drm_core_ioremap(dev_priv->primary, dev);
 844                 drm_core_ioremap(dev->agp_buffer_map, dev);
 845         }
 846
 847         dev_priv->sarea_priv =
 848                 (drm_mga_sarea_t *)((u8 *)dev_priv->sarea->handle +
 849                                     init->sarea_priv_offset);
 850
 851         if (!dev_priv->warp->handle ||
 852             !dev_priv->primary->handle ||
 853             ((dev_priv->dma_access != 0) &&
 854              ((dev->agp_buffer_map == NULL) ||
 855               (dev->agp_buffer_map->handle == NULL)))) {
 856                 DRM_ERROR("failed to ioremap agp regions!\n");
 857                 return DRM_ERR(ENOMEM);
 858         }
 859
 860         ret = mga_warp_install_microcode(dev_priv);
 861         if (ret < 0) {
 862                 DRM_ERROR("failed to install WARP ucode!\n");
 863                 return ret;
 864         }
 865
 866         ret = mga_warp_init(dev_priv);
 867         if (ret < 0) {
 868                 DRM_ERROR("failed to init WARP engine!\n");
 869                 return ret;
 870         }
 871
 872         dev_priv->prim.status = (u32 *)dev_priv->status->handle;
 873
 874         mga_do_wait_for_idle( dev_priv );
 875
 876         /* Init the primary DMA registers.
 877          */
 878         MGA_WRITE( MGA_PRIMADDRESS,
 879                    dev_priv->primary->offset | MGA_DMA_GENERAL );
 880 #if 0
 881         MGA_WRITE( MGA_PRIMPTR,
 882                    virt_to_bus((void *)dev_priv->prim.status) |
 883                    MGA_PRIMPTREN0 |     /* Soft trap, SECEND, SETUPEND */
 884                    MGA_PRIMPTREN1 );    /* DWGSYNC */
 885 #endif
 886
 887         dev_priv->prim.start = (u8 *)dev_priv->primary->handle;
 888         dev_priv->prim.end = ((u8 *)dev_priv->primary->handle
 889                               + dev_priv->primary->size);
 890         dev_priv->prim.size = dev_priv->primary->size;
 891
 892         dev_priv->prim.tail = 0;
 893         dev_priv->prim.space = dev_priv->prim.size;
 894         dev_priv->prim.wrapped = 0;
 895
 896         dev_priv->prim.last_flush = 0;
 897         dev_priv->prim.last_wrap = 0;
 898
 899         dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
 900
 901         dev_priv->prim.status[0] = dev_priv->primary->offset;
 902         dev_priv->prim.status[1] = 0;
 903
 904         dev_priv->sarea_priv->last_wrap = 0;
 905         dev_priv->sarea_priv->last_frame.head = 0;
 906         dev_priv->sarea_priv->last_frame.wrap = 0;
 907
 908         if (mga_freelist_init(dev, dev_priv) < 0) {
 909                 DRM_ERROR("could not initialize freelist\n");
 910                 return DRM_ERR(ENOMEM);
 911         }
 912
 913         return 0;
 914 }
 915
 916 static int mga_do_cleanup_dma( drm_device_t *dev )
 917 {
 918         int err = 0;
 919         DRM_DEBUG("\n");
 920
 921         /* Make sure interrupts are disabled here because the uninstall ioctl
 922          * may not have been called from userspace and after dev_private
 923          * is freed, it's too late.
 924          */
 925         if ( dev->irq_enabled ) drm_irq_uninstall(dev);
 926
 927         if ( dev->dev_private ) {
 928                 drm_mga_private_t *dev_priv = dev->dev_private;
 929
 930                 if ((dev_priv->warp != NULL)
 931                     && (dev_priv->mmio->type != _DRM_CONSISTENT))
 932                         drm_core_ioremapfree(dev_priv->warp, dev);
 933
 934                 if ((dev_priv->primary != NULL)
 935                     && (dev_priv->primary->type != _DRM_CONSISTENT))
 936                         drm_core_ioremapfree(dev_priv->primary, dev);
 937
 938                 if (dev->agp_buffer_map != NULL)
 939                         drm_core_ioremapfree(dev->agp_buffer_map, dev);
 940
 941                 if (dev_priv->used_new_dma_init) {
 942 #if __OS_HAS_AGP
 943                         if (dev_priv->agp_mem != NULL) {
 944                                 dev_priv->agp_textures = NULL;
 945                                 drm_unbind_agp(dev_priv->agp_mem);
 946
 947                                 drm_free_agp(dev_priv->agp_mem, dev_priv->agp_pages);
 948                                 dev_priv->agp_pages = 0;
 949                                 dev_priv->agp_mem = NULL;
 950                         }
 951
 952                         if ((dev->agp != NULL) && dev->agp->acquired) {
 953                                 err = drm_agp_release(dev);
 954                         }
 955 #endif
 956                         dev_priv->used_new_dma_init = 0;
 957                 }
 958
 959                 dev_priv->warp = NULL;
 960                 dev_priv->primary = NULL;
 961                 dev_priv->mmio = NULL;
 962                 dev_priv->status = NULL;
 963                 dev_priv->sarea = NULL;
 964                 dev_priv->sarea_priv = NULL;
 965                 dev->agp_buffer_map = NULL;
 966
 967                 memset(&dev_priv->prim, 0, sizeof(dev_priv->prim));
 968                 dev_priv->warp_pipe = 0;
 969                 memset(dev_priv->warp_pipe_phys, 0, sizeof(dev_priv->warp_pipe_phys));
 970
 971                 if (dev_priv->head != NULL) {
 972                         mga_freelist_cleanup(dev);
 973                 }
 974         }
 975
 976         return err;
 977 }
 978
 979 int mga_dma_init( DRM_IOCTL_ARGS )
 980 {
 981         DRM_DEVICE;
 982         drm_mga_init_t init;
 983         int err;
 984
 985         LOCK_TEST_WITH_RETURN( dev, filp );
 986
 987         DRM_COPY_FROM_USER_IOCTL(init, (drm_mga_init_t __user *) data,
 988                                  sizeof(init));
 989
 990         switch ( init.func ) {
 991         case MGA_INIT_DMA:
 992                 err = mga_do_init_dma(dev, &init);
 993                 if (err) {
 994                         (void) mga_do_cleanup_dma(dev);
 995                 }
 996                 return err;
 997         case MGA_CLEANUP_DMA:
 998                 return mga_do_cleanup_dma( dev );
 999         }
1000
1001         return DRM_ERR(EINVAL);
1002 }
1003
1004
1005 /* ================================================================
1006  * Primary DMA stream management
1007  */
1008
1009 int mga_dma_flush( DRM_IOCTL_ARGS )
1010 {
1011         DRM_DEVICE;
1012         drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
1013         drm_lock_t lock;
1014
1015         LOCK_TEST_WITH_RETURN( dev, filp );
1016
1017         DRM_COPY_FROM_USER_IOCTL( lock, (drm_lock_t __user *)data, sizeof(lock) );
1018
1019         DRM_DEBUG( "%s%s%s\n",
1020                    (lock.flags & _DRM_LOCK_FLUSH) ?     "flush, " : "",
1021                    (lock.flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
1022                    (lock.flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "" );
1023
1024         WRAP_WAIT_WITH_RETURN( dev_priv );
1025
1026         if ( lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL) ) {
1027                 mga_do_dma_flush( dev_priv );
1028         }
1029
1030         if ( lock.flags & _DRM_LOCK_QUIESCENT ) {
1031 #if MGA_DMA_DEBUG
1032                 int ret = mga_do_wait_for_idle( dev_priv );
1033                 if ( ret < 0 )
1034                         DRM_INFO( "%s: -EBUSY\n", __FUNCTION__ );
1035                 return ret;
1036 #else
1037                 return mga_do_wait_for_idle( dev_priv );
1038 #endif
1039         } else {
1040                 return 0;
1041         }
1042 }
1043
1044 int mga_dma_reset( DRM_IOCTL_ARGS )
1045 {
1046         DRM_DEVICE;
1047         drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
1048
1049         LOCK_TEST_WITH_RETURN( dev, filp );
1050
1051         return mga_do_dma_reset( dev_priv );
1052 }
1053
1054
1055 /* ================================================================
1056  * DMA buffer management
1057  */
1058
1059 static int mga_dma_get_buffers( DRMFILE filp,
1060                                 drm_device_t *dev, drm_dma_t *d )
1061 {
1062         drm_buf_t *buf;
1063         int i;
1064
1065         for ( i = d->granted_count ; i < d->request_count ; i++ ) {
1066                 buf = mga_freelist_get( dev );
1067                 if ( !buf ) return DRM_ERR(EAGAIN);
1068
1069                 buf->filp = filp;
1070
1071                 if ( DRM_COPY_TO_USER( &d->request_indices[i],
1072                                    &buf->idx, sizeof(buf->idx) ) )
1073                         return DRM_ERR(EFAULT);
1074                 if ( DRM_COPY_TO_USER( &d->request_sizes[i],
1075                                    &buf->total, sizeof(buf->total) ) )
1076                         return DRM_ERR(EFAULT);
1077
1078                 d->granted_count++;
1079         }
1080         return 0;
1081 }
1082
1083 int mga_dma_buffers( DRM_IOCTL_ARGS )
1084 {
1085         DRM_DEVICE;
1086         drm_device_dma_t *dma = dev->dma;
1087         drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
1088         drm_dma_t __user *argp = (void __user *)data;
1089         drm_dma_t d;
1090         int ret = 0;
1091
1092         LOCK_TEST_WITH_RETURN( dev, filp );
1093
1094         DRM_COPY_FROM_USER_IOCTL( d, argp, sizeof(d) );
1095
1096         /* Please don't send us buffers.
1097          */
1098         if ( d.send_count != 0 ) {
1099                 DRM_ERROR( "Process %d trying to send %d buffers via drmDMA\n",
1100                            DRM_CURRENTPID, d.send_count );
1101                 return DRM_ERR(EINVAL);
1102         }
1103
1104         /* We'll send you buffers.
1105          */
1106         if ( d.request_count < 0 || d.request_count > dma->buf_count ) {
1107                 DRM_ERROR( "Process %d trying to get %d buffers (of %d max)\n",
1108                            DRM_CURRENTPID, d.request_count, dma->buf_count );
1109                 return DRM_ERR(EINVAL);
1110         }
1111
1112         WRAP_TEST_WITH_RETURN( dev_priv );
1113
1114         d.granted_count = 0;
1115
1116         if ( d.request_count ) {
1117                 ret = mga_dma_get_buffers( filp, dev, &d );
1118         }
1119
1120         DRM_COPY_TO_USER_IOCTL( argp, d, sizeof(d) );
1121
1122         return ret;
1123 }
1124
1125 /**
1126  * Called just before the module is unloaded.
1127  */
1128 int mga_driver_postcleanup(drm_device_t * dev)
1129 {
1130         drm_free(dev->dev_private, sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
1131         dev->dev_private = NULL;
1132
1133         return 0;
1134 }
1135
1136 /**
1137  * Called when the last opener of the device is closed.
1138  */
1139 void mga_driver_pretakedown(drm_device_t * dev)
1140 {
1141         mga_do_cleanup_dma( dev );
1142 }
1143
1144 int mga_driver_dma_quiescent(drm_device_t *dev)
1145 {
1146         drm_mga_private_t *dev_priv = dev->dev_private;
1147         return mga_do_wait_for_idle( dev_priv );
1148 }