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 #define MINIMAL_CLEANUP 0
  48 #define FULL_CLEANUP 1
  49 static int mga_do_cleanup_dma(struct drm_device *dev, int full_cleanup);
  50
  51 /* ================================================================
  52  * Engine control
  53  */
  54
  55 int mga_do_wait_for_idle(drm_mga_private_t * dev_priv)
  56 {
  57         u32 status = 0;
  58         int i;
  59         DRM_DEBUG("\n");
  60
  61         for (i = 0; i < dev_priv->usec_timeout; i++) {
  62                 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
  63                 if (status == MGA_ENDPRDMASTS) {
  64                         MGA_WRITE8(MGA_CRTC_INDEX, 0);
  65                         return 0;
  66                 }
  67                 DRM_UDELAY(1);
  68         }
  69
  70 #if MGA_DMA_DEBUG
  71         DRM_ERROR("failed!\n");
  72         DRM_INFO("   status=0x%08x\n", status);
  73 #endif
  74         return DRM_ERR(EBUSY);
  75 }
  76
  77 static int mga_do_dma_reset(drm_mga_private_t * dev_priv)
  78 {
  79         drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
  80         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
  81
  82         DRM_DEBUG("\n");
  83
  84         /* The primary DMA stream should look like new right about now.
  85          */
  86         primary->tail = 0;
  87         primary->space = primary->size;
  88         primary->last_flush = 0;
  89
  90         sarea_priv->last_wrap = 0;
  91
  92         /* FIXME: Reset counters, buffer ages etc...
  93          */
  94
  95         /* FIXME: What else do we need to reinitialize?  WARP stuff?
  96          */
  97
  98         return 0;
  99 }
 100
 101 /* ================================================================
 102  * Primary DMA stream
 103  */
 104
 105 void mga_do_dma_flush(drm_mga_private_t * dev_priv)
 106 {
 107         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 108         u32 head, tail;
 109         u32 status = 0;
 110         int i;
 111         DMA_LOCALS;
 112         DRM_DEBUG("\n");
 113
 114         /* We need to wait so that we can do an safe flush */
 115         for (i = 0; i < dev_priv->usec_timeout; i++) {
 116                 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK;
 117                 if (status == MGA_ENDPRDMASTS)
 118                         break;
 119                 DRM_UDELAY(1);
 120         }
 121
 122         if (primary->tail == primary->last_flush) {
 123                 DRM_DEBUG("   bailing out...\n");
 124                 return;
 125         }
 126
 127         tail = primary->tail + dev_priv->primary->offset;
 128
 129         /* We need to pad the stream between flushes, as the card
 130          * actually (partially?) reads the first of these commands.
 131          * See page 4-16 in the G400 manual, middle of the page or so.
 132          */
 133         BEGIN_DMA(1);
 134
 135         DMA_BLOCK(MGA_DMAPAD, 0x00000000,
 136                   MGA_DMAPAD, 0x00000000,
 137                   MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
 138
 139         ADVANCE_DMA();
 140
 141         primary->last_flush = primary->tail;
 142
 143         head = MGA_READ(MGA_PRIMADDRESS);
 144
 145         if (head <= tail) {
 146                 primary->space = primary->size - primary->tail;
 147         } else {
 148                 primary->space = head - tail;
 149         }
 150
 151         DRM_DEBUG("   head = 0x%06lx\n", head - dev_priv->primary->offset);
 152         DRM_DEBUG("   tail = 0x%06lx\n", tail - dev_priv->primary->offset);
 153         DRM_DEBUG("  space = 0x%06x\n", primary->space);
 154
 155         mga_flush_write_combine();
 156         MGA_WRITE(MGA_PRIMEND, tail | dev_priv->dma_access);
 157
 158         DRM_DEBUG("done.\n");
 159 }
 160
 161 void mga_do_dma_wrap_start(drm_mga_private_t * dev_priv)
 162 {
 163         drm_mga_primary_buffer_t *primary = &dev_priv->prim;
 164         u32 head, tail;
 165         DMA_LOCALS;
 166         DRM_DEBUG("\n");
 167
 168         BEGIN_DMA_WRAP();
 169
 170         DMA_BLOCK(MGA_DMAPAD, 0x00000000,
 171                   MGA_DMAPAD, 0x00000000,
 172                   MGA_DMAPAD, 0x00000000, MGA_DMAPAD, 0x00000000);
 173
 174         ADVANCE_DMA();
 175
 176         tail = primary->tail + dev_priv->primary->offset;
 177
 178         primary->tail = 0;
 179         primary->last_flush = 0;
 180         primary->last_wrap++;
 181
 182         head = MGA_READ(MGA_PRIMADDRESS);
 183
 184         if (head == dev_priv->primary->offset) {
 185                 primary->space = primary->size;
 186         } else {
 187                 primary->space = head - dev_priv->primary->offset;
 188         }
 189
 190         DRM_DEBUG("   head = 0x%06lx\n", 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  * Freelist management
 221  */
 222
 223 #define MGA_BUFFER_USED         ~0
 224 #define MGA_BUFFER_FREE         0
 225
 226 #if MGA_FREELIST_DEBUG
 227 static void mga_freelist_print(struct drm_device * dev)
 228 {
 229         drm_mga_private_t *dev_priv = dev->dev_private;
 230         drm_mga_freelist_t *entry;
 231
 232         DRM_INFO("\n");
 233         DRM_INFO("current dispatch: last=0x%x done=0x%x\n",
 234                  dev_priv->sarea_priv->last_dispatch,
 235                  (unsigned int)(MGA_READ(MGA_PRIMADDRESS) -
 236                                 dev_priv->primary->offset));
 237         DRM_INFO("current freelist:\n");
 238
 239         for (entry = dev_priv->head->next; entry; entry = entry->next) {
 240                 DRM_INFO("   %p   idx=%2d  age=0x%x 0x%06lx\n",
 241                          entry, entry->buf->idx, entry->age.head,
 242                          entry->age.head - dev_priv->primary->offset);
 243         }
 244         DRM_INFO("\n");
 245 }
 246 #endif
 247
 248 static int mga_freelist_init(struct drm_device * dev, drm_mga_private_t * dev_priv)
 249 {
 250         struct drm_device_dma *dma = dev->dma;
 251         struct drm_buf *buf;
 252         drm_mga_buf_priv_t *buf_priv;
 253         drm_mga_freelist_t *entry;
 254         int i;
 255         DRM_DEBUG("count=%d\n", dma->buf_count);
 256
 257         dev_priv->head = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
 258         if (dev_priv->head == NULL)
 259                 return DRM_ERR(ENOMEM);
 260
 261         memset(dev_priv->head, 0, sizeof(drm_mga_freelist_t));
 262         SET_AGE(&dev_priv->head->age, MGA_BUFFER_USED, 0);
 263
 264         for (i = 0; i < dma->buf_count; i++) {
 265                 buf = dma->buflist[i];
 266                 buf_priv = buf->dev_private;
 267
 268                 entry = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
 269                 if (entry == NULL)
 270                         return DRM_ERR(ENOMEM);
 271
 272                 memset(entry, 0, sizeof(drm_mga_freelist_t));
 273
 274                 entry->next = dev_priv->head->next;
 275                 entry->prev = dev_priv->head;
 276                 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
 277                 entry->buf = buf;
 278
 279                 if (dev_priv->head->next != NULL)
 280                         dev_priv->head->next->prev = entry;
 281                 if (entry->next == NULL)
 282                         dev_priv->tail = entry;
 283
 284                 buf_priv->list_entry = entry;
 285                 buf_priv->discard = 0;
 286                 buf_priv->dispatched = 0;
 287
 288                 dev_priv->head->next = entry;
 289         }
 290
 291         return 0;
 292 }
 293
 294 static void mga_freelist_cleanup(struct drm_device * dev)
 295 {
 296         drm_mga_private_t *dev_priv = dev->dev_private;
 297         drm_mga_freelist_t *entry;
 298         drm_mga_freelist_t *next;
 299         DRM_DEBUG("\n");
 300
 301         entry = dev_priv->head;
 302         while (entry) {
 303                 next = entry->next;
 304                 drm_free(entry, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
 305                 entry = next;
 306         }
 307
 308         dev_priv->head = dev_priv->tail = NULL;
 309 }
 310
 311 #if 0
 312 /* FIXME: Still needed?
 313  */
 314 static void mga_freelist_reset(struct drm_device * dev)
 315 {
 316         struct drm_device_dma *dma = dev->dma;
 317         struct drm_buf *buf;
 318         drm_mga_buf_priv_t *buf_priv;
 319         int i;
 320
 321         for (i = 0; i < dma->buf_count; i++) {
 322                 buf = dma->buflist[i];
 323                 buf_priv = buf->dev_private;
 324                 SET_AGE(&buf_priv->list_entry->age, MGA_BUFFER_FREE, 0);
 325         }
 326 }
 327 #endif
 328
 329 static struct drm_buf *mga_freelist_get(struct drm_device * dev)
 330 {
 331         drm_mga_private_t *dev_priv = dev->dev_private;
 332         drm_mga_freelist_t *next;
 333         drm_mga_freelist_t *prev;
 334         drm_mga_freelist_t *tail = dev_priv->tail;
 335         u32 head, wrap;
 336         DRM_DEBUG("\n");
 337
 338         head = MGA_READ(MGA_PRIMADDRESS);
 339         wrap = dev_priv->sarea_priv->last_wrap;
 340
 341         DRM_DEBUG("   tail=0x%06lx %d\n",
 342                   tail->age.head ?
 343                   tail->age.head - dev_priv->primary->offset : 0,
 344                   tail->age.wrap);
 345         DRM_DEBUG("   head=0x%06lx %d\n",
 346                   head - dev_priv->primary->offset, wrap);
 347
 348         if (TEST_AGE(&tail->age, head, wrap)) {
 349                 prev = dev_priv->tail->prev;
 350                 next = dev_priv->tail;
 351                 prev->next = NULL;
 352                 next->prev = next->next = NULL;
 353                 dev_priv->tail = prev;
 354                 SET_AGE(&next->age, MGA_BUFFER_USED, 0);
 355                 return next->buf;
 356         }
 357
 358         DRM_DEBUG("returning NULL!\n");
 359         return NULL;
 360 }
 361
 362 int mga_freelist_put(struct drm_device * dev, struct drm_buf * buf)
 363 {
 364         drm_mga_private_t *dev_priv = dev->dev_private;
 365         drm_mga_buf_priv_t *buf_priv = buf->dev_private;
 366         drm_mga_freelist_t *head, *entry, *prev;
 367
 368         DRM_DEBUG("age=0x%06lx wrap=%d\n",
 369                   buf_priv->list_entry->age.head -
 370                   dev_priv->primary->offset, buf_priv->list_entry->age.wrap);
 371
 372         entry = buf_priv->list_entry;
 373         head = dev_priv->head;
 374
 375         if (buf_priv->list_entry->age.head == MGA_BUFFER_USED) {
 376                 SET_AGE(&entry->age, MGA_BUFFER_FREE, 0);
 377                 prev = dev_priv->tail;
 378                 prev->next = entry;
 379                 entry->prev = prev;
 380                 entry->next = NULL;
 381         } else {
 382                 prev = head->next;
 383                 head->next = entry;
 384                 prev->prev = entry;
 385                 entry->prev = head;
 386                 entry->next = prev;
 387         }
 388
 389         return 0;
 390 }
 391
 392 /* ================================================================
 393  * DMA initialization, cleanup
 394  */
 395
 396 int mga_driver_load(struct drm_device * dev, unsigned long flags)
 397 {
 398         drm_mga_private_t *dev_priv;
 399
 400         dev_priv = drm_alloc(sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
 401         if (!dev_priv)
 402                 return DRM_ERR(ENOMEM);
 403
 404         dev->dev_private = (void *)dev_priv;
 405         memset(dev_priv, 0, sizeof(drm_mga_private_t));
 406
 407         dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
 408         dev_priv->chipset = flags;
 409
 410         dev_priv->mmio_base = drm_get_resource_start(dev, 1);
 411         dev_priv->mmio_size = drm_get_resource_len(dev, 1);
 412
 413         dev->counters += 3;
 414         dev->types[6] = _DRM_STAT_IRQ;
 415         dev->types[7] = _DRM_STAT_PRIMARY;
 416         dev->types[8] = _DRM_STAT_SECONDARY;
 417
 418         return 0;
 419 }
 420
 421 #if __OS_HAS_AGP
 422 /**
 423  * Bootstrap the driver for AGP DMA.
 424  *
 425  * \todo
 426  * Investigate whether there is any benifit to storing the WARP microcode in
 427  * AGP memory.  If not, the microcode may as well always be put in PCI
 428  * memory.
 429  *
 430  * \todo
 431  * This routine needs to set dma_bs->agp_mode to the mode actually configured
 432  * in the hardware.  Looking just at the Linux AGP driver code, I don't see
 433  * an easy way to determine this.
 434  *
 435  * \sa mga_do_dma_bootstrap, mga_do_pci_dma_bootstrap
 436  */
 437 static int mga_do_agp_dma_bootstrap(struct drm_device * dev,
 438                                     drm_mga_dma_bootstrap_t * dma_bs)
 439 {
 440         drm_mga_private_t *const dev_priv =
 441             (drm_mga_private_t *) dev->dev_private;
 442         unsigned int warp_size = mga_warp_microcode_size(dev_priv);
 443         int err;
 444         unsigned offset;
 445         const unsigned secondary_size = dma_bs->secondary_bin_count
 446             * dma_bs->secondary_bin_size;
 447         const unsigned agp_size = (dma_bs->agp_size << 20);
 448         struct drm_buf_desc req;
 449         struct drm_agp_mode mode;
 450         struct drm_agp_info info;
 451         struct drm_agp_buffer agp_req;
 452         struct drm_agp_binding bind_req;
 453
 454         /* Acquire AGP. */
 455         err = drm_agp_acquire(dev);
 456         if (err) {
 457                 DRM_ERROR("Unable to acquire AGP: %d\n", err);
 458                 return err;
 459         }
 460
 461         err = drm_agp_info(dev, &info);
 462         if (err) {
 463                 DRM_ERROR("Unable to get AGP info: %d\n", err);
 464                 return err;
 465         }
 466
 467         mode.mode = (info.mode & ~0x07) | dma_bs->agp_mode;
 468         err = drm_agp_enable(dev, mode);
 469         if (err) {
 470                 DRM_ERROR("Unable to enable AGP (mode = 0x%lx)\n", mode.mode);
 471                 return err;
 472         }
 473
 474         /* In addition to the usual AGP mode configuration, the G200 AGP cards
 475          * need to have the AGP mode "manually" set.
 476          */
 477
 478         if (dev_priv->chipset == MGA_CARD_TYPE_G200) {
 479                 if (mode.mode & 0x02) {
 480                         MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_ENABLE);
 481                 } else {
 482                         MGA_WRITE(MGA_AGP_PLL, MGA_AGP2XPLL_DISABLE);
 483                 }
 484         }
 485
 486         /* Allocate and bind AGP memory. */
 487         agp_req.size = agp_size;
 488         agp_req.type = 0;
 489         err = drm_agp_alloc(dev, &agp_req);
 490         if (err) {
 491                 dev_priv->agp_size = 0;
 492                 DRM_ERROR("Unable to allocate %uMB AGP memory\n",
 493                           dma_bs->agp_size);
 494                 return err;
 495         }
 496
 497         dev_priv->agp_size = agp_size;
 498         dev_priv->agp_handle = agp_req.handle;
 499
 500         bind_req.handle = agp_req.handle;
 501         bind_req.offset = 0;
 502         err = drm_agp_bind(dev, &bind_req);
 503         if (err) {
 504                 DRM_ERROR("Unable to bind AGP memory: %d\n", err);
 505                 return err;
 506         }
 507
 508         /* Make drm_addbufs happy by not trying to create a mapping for less
 509          * than a page.
 510          */
 511         if (warp_size < PAGE_SIZE)
 512                 warp_size = PAGE_SIZE;
 513
 514         offset = 0;
 515         err = drm_addmap(dev, offset, warp_size,
 516                          _DRM_AGP, _DRM_READ_ONLY, &dev_priv->warp);
 517         if (err) {
 518                 DRM_ERROR("Unable to map WARP microcode: %d\n", err);
 519                 return err;
 520         }
 521
 522         offset += warp_size;
 523         err = drm_addmap(dev, offset, dma_bs->primary_size,
 524                          _DRM_AGP, _DRM_READ_ONLY, &dev_priv->primary);
 525         if (err) {
 526                 DRM_ERROR("Unable to map primary DMA region: %d\n", err);
 527                 return err;
 528         }
 529
 530         offset += dma_bs->primary_size;
 531         err = drm_addmap(dev, offset, secondary_size,
 532                          _DRM_AGP, 0, &dev->agp_buffer_map);
 533         if (err) {
 534                 DRM_ERROR("Unable to map secondary DMA region: %d\n", err);
 535                 return err;
 536         }
 537
 538         (void)memset(&req, 0, sizeof(req));
 539         req.count = dma_bs->secondary_bin_count;
 540         req.size = dma_bs->secondary_bin_size;
 541         req.flags = _DRM_AGP_BUFFER;
 542         req.agp_start = offset;
 543
 544         err = drm_addbufs_agp(dev, &req);
 545         if (err) {
 546                 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
 547                 return err;
 548         }
 549
 550         {
 551                 struct drm_map_list *_entry;
 552                 unsigned long agp_token = 0;
 553
 554                 list_for_each_entry(_entry, &dev->maplist, head) {
 555                         if (_entry->map == dev->agp_buffer_map)
 556                                 agp_token = _entry->user_token;
 557                 }
 558                 if (!agp_token)
 559                         return -EFAULT;
 560
 561                 dev->agp_buffer_token = agp_token;
 562         }
 563
 564         offset += secondary_size;
 565         err = drm_addmap(dev, offset, agp_size - offset,
 566                          _DRM_AGP, 0, &dev_priv->agp_textures);
 567         if (err) {
 568                 DRM_ERROR("Unable to map AGP texture region %d\n", err);
 569                 return err;
 570         }
 571
 572         drm_core_ioremap(dev_priv->warp, dev);
 573         drm_core_ioremap(dev_priv->primary, dev);
 574         drm_core_ioremap(dev->agp_buffer_map, dev);
 575
 576         if (!dev_priv->warp->handle ||
 577             !dev_priv->primary->handle || !dev->agp_buffer_map->handle) {
 578                 DRM_ERROR("failed to ioremap agp regions! (%p, %p, %p)\n",
 579                           dev_priv->warp->handle, dev_priv->primary->handle,
 580                           dev->agp_buffer_map->handle);
 581                 return DRM_ERR(ENOMEM);
 582         }
 583
 584         dev_priv->dma_access = MGA_PAGPXFER;
 585         dev_priv->wagp_enable = MGA_WAGP_ENABLE;
 586
 587         DRM_INFO("Initialized card for AGP DMA.\n");
 588         return 0;
 589 }
 590 #else
 591 static int mga_do_agp_dma_bootstrap(struct drm_device * dev,
 592                                     drm_mga_dma_bootstrap_t * dma_bs)
 593 {
 594         return -EINVAL;
 595 }
 596 #endif
 597
 598 /**
 599  * Bootstrap the driver for PCI DMA.
 600  *
 601  * \todo
 602  * The algorithm for decreasing the size of the primary DMA buffer could be
 603  * better.  The size should be rounded up to the nearest page size, then
 604  * decrease the request size by a single page each pass through the loop.
 605  *
 606  * \todo
 607  * Determine whether the maximum address passed to drm_pci_alloc is correct.
 608  * The same goes for drm_addbufs_pci.
 609  *
 610  * \sa mga_do_dma_bootstrap, mga_do_agp_dma_bootstrap
 611  */
 612 static int mga_do_pci_dma_bootstrap(struct drm_device * dev,
 613                                     drm_mga_dma_bootstrap_t * dma_bs)
 614 {
 615         drm_mga_private_t *const dev_priv =
 616             (drm_mga_private_t *) dev->dev_private;
 617         unsigned int warp_size = mga_warp_microcode_size(dev_priv);
 618         unsigned int primary_size;
 619         unsigned int bin_count;
 620         int err;
 621         struct drm_buf_desc req;
 622
 623         if (dev->dma == NULL) {
 624                 DRM_ERROR("dev->dma is NULL\n");
 625                 return DRM_ERR(EFAULT);
 626         }
 627
 628         /* Make drm_addbufs happy by not trying to create a mapping for less
 629          * than a page.
 630          */
 631         if (warp_size < PAGE_SIZE)
 632                 warp_size = PAGE_SIZE;
 633
 634         /* The proper alignment is 0x100 for this mapping */
 635         err = drm_addmap(dev, 0, warp_size, _DRM_CONSISTENT,
 636                          _DRM_READ_ONLY, &dev_priv->warp);
 637         if (err != 0) {
 638                 DRM_ERROR("Unable to create mapping for WARP microcode: %d\n",
 639                           err);
 640                 return err;
 641         }
 642
 643         /* Other than the bottom two bits being used to encode other
 644          * information, there don't appear to be any restrictions on the
 645          * alignment of the primary or secondary DMA buffers.
 646          */
 647
 648         for (primary_size = dma_bs->primary_size; primary_size != 0;
 649              primary_size >>= 1) {
 650                 /* The proper alignment for this mapping is 0x04 */
 651                 err = drm_addmap(dev, 0, primary_size, _DRM_CONSISTENT,
 652                                  _DRM_READ_ONLY, &dev_priv->primary);
 653                 if (!err)
 654                         break;
 655         }
 656
 657         if (err != 0) {
 658                 DRM_ERROR("Unable to allocate primary DMA region: %d\n", err);
 659                 return DRM_ERR(ENOMEM);
 660         }
 661
 662         if (dev_priv->primary->size != dma_bs->primary_size) {
 663                 DRM_INFO("Primary DMA buffer size reduced from %u to %u.\n",
 664                          dma_bs->primary_size,
 665                          (unsigned)dev_priv->primary->size);
 666                 dma_bs->primary_size = dev_priv->primary->size;
 667         }
 668
 669         for (bin_count = dma_bs->secondary_bin_count; bin_count > 0;
 670              bin_count--) {
 671                 (void)memset(&req, 0, sizeof(req));
 672                 req.count = bin_count;
 673                 req.size = dma_bs->secondary_bin_size;
 674
 675                 err = drm_addbufs_pci(dev, &req);
 676                 if (!err) {
 677                         break;
 678                 }
 679         }
 680
 681         if (bin_count == 0) {
 682                 DRM_ERROR("Unable to add secondary DMA buffers: %d\n", err);
 683                 return err;
 684         }
 685
 686         if (bin_count != dma_bs->secondary_bin_count) {
 687                 DRM_INFO("Secondary PCI DMA buffer bin count reduced from %u "
 688                          "to %u.\n", dma_bs->secondary_bin_count, bin_count);
 689
 690                 dma_bs->secondary_bin_count = bin_count;
 691         }
 692
 693         dev_priv->dma_access = 0;
 694         dev_priv->wagp_enable = 0;
 695
 696         dma_bs->agp_mode = 0;
 697
 698         DRM_INFO("Initialized card for PCI DMA.\n");
 699         return 0;
 700 }
 701
 702 static int mga_do_dma_bootstrap(struct drm_device * dev,
 703                                 drm_mga_dma_bootstrap_t * dma_bs)
 704 {
 705         const int is_agp = (dma_bs->agp_mode != 0) && drm_device_is_agp(dev);
 706         int err;
 707         drm_mga_private_t *const dev_priv =
 708             (drm_mga_private_t *) dev->dev_private;
 709
 710         dev_priv->used_new_dma_init = 1;
 711
 712         /* The first steps are the same for both PCI and AGP based DMA.  Map
 713          * the cards MMIO registers and map a status page.
 714          */
 715         err = drm_addmap(dev, dev_priv->mmio_base, dev_priv->mmio_size,
 716                          _DRM_REGISTERS, _DRM_READ_ONLY, &dev_priv->mmio);
 717         if (err) {
 718                 DRM_ERROR("Unable to map MMIO region: %d\n", err);
 719                 return err;
 720         }
 721
 722         err = drm_addmap(dev, 0, SAREA_MAX, _DRM_SHM,
 723                          _DRM_READ_ONLY | _DRM_LOCKED | _DRM_KERNEL,
 724                          &dev_priv->status);
 725         if (err) {
 726                 DRM_ERROR("Unable to map status region: %d\n", err);
 727                 return err;
 728         }
 729
 730         /* The DMA initialization procedure is slightly different for PCI and
 731          * AGP cards.  AGP cards just allocate a large block of AGP memory and
 732          * carve off portions of it for internal uses.  The remaining memory
 733          * is returned to user-mode to be used for AGP textures.
 734          */
 735         if (is_agp) {
 736                 err = mga_do_agp_dma_bootstrap(dev, dma_bs);
 737         }
 738
 739         /* If we attempted to initialize the card for AGP DMA but failed,
 740          * clean-up any mess that may have been created.
 741          */
 742
 743         if (err) {
 744                 mga_do_cleanup_dma(dev, MINIMAL_CLEANUP);
 745         }
 746
 747         /* Not only do we want to try and initialized PCI cards for PCI DMA,
 748          * but we also try to initialized AGP cards that could not be
 749          * initialized for AGP DMA.  This covers the case where we have an AGP
 750          * card in a system with an unsupported AGP chipset.  In that case the
 751          * card will be detected as AGP, but we won't be able to allocate any
 752          * AGP memory, etc.
 753          */
 754
 755         if (!is_agp || err) {
 756                 err = mga_do_pci_dma_bootstrap(dev, dma_bs);
 757         }
 758
 759         return err;
 760 }
 761
 762 int mga_dma_bootstrap(DRM_IOCTL_ARGS)
 763 {
 764         DRM_DEVICE;
 765         drm_mga_dma_bootstrap_t bootstrap;
 766         int err;
 767         static const int modes[] = { 0, 1, 2, 2, 4, 4, 4, 4 };
 768         const drm_mga_private_t *const dev_priv =
 769                 (drm_mga_private_t *) dev->dev_private;
 770
 771         DRM_COPY_FROM_USER_IOCTL(bootstrap,
 772                                  (drm_mga_dma_bootstrap_t __user *) data,
 773                                  sizeof(bootstrap));
 774
 775         err = mga_do_dma_bootstrap(dev, &bootstrap);
 776         if (err) {
 777                 mga_do_cleanup_dma(dev, FULL_CLEANUP);
 778                 return err;
 779         }
 780
 781         if (dev_priv->agp_textures != NULL) {
 782                 bootstrap.texture_handle = dev_priv->agp_textures->offset;
 783                 bootstrap.texture_size = dev_priv->agp_textures->size;
 784         } else {
 785                 bootstrap.texture_handle = 0;
 786                 bootstrap.texture_size = 0;
 787         }
 788
 789         bootstrap.agp_mode = modes[bootstrap.agp_mode & 0x07];
 790         DRM_COPY_TO_USER_IOCTL((drm_mga_dma_bootstrap_t __user *)data,
 791                                bootstrap, sizeof(bootstrap));
 792
 793         return err;
 794 }
 795
 796 static int mga_do_init_dma(struct drm_device * dev, drm_mga_init_t * init)
 797 {
 798         drm_mga_private_t *dev_priv;
 799         int ret;
 800         DRM_DEBUG("\n");
 801
 802         dev_priv = dev->dev_private;
 803
 804         if (init->sgram) {
 805                 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
 806         } else {
 807                 dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
 808         }
 809         dev_priv->maccess = init->maccess;
 810
 811         dev_priv->fb_cpp = init->fb_cpp;
 812         dev_priv->front_offset = init->front_offset;
 813         dev_priv->front_pitch = init->front_pitch;
 814         dev_priv->back_offset = init->back_offset;
 815         dev_priv->back_pitch = init->back_pitch;
 816
 817         dev_priv->depth_cpp = init->depth_cpp;
 818         dev_priv->depth_offset = init->depth_offset;
 819         dev_priv->depth_pitch = init->depth_pitch;
 820
 821         /* FIXME: Need to support AGP textures...
 822          */
 823         dev_priv->texture_offset = init->texture_offset[0];
 824         dev_priv->texture_size = init->texture_size[0];
 825
 826         dev_priv->sarea = drm_getsarea(dev);
 827         if (!dev_priv->sarea) {
 828                 DRM_ERROR("failed to find sarea!\n");
 829                 return DRM_ERR(EINVAL);
 830         }
 831
 832         if (!dev_priv->used_new_dma_init) {
 833
 834                 dev_priv->dma_access = MGA_PAGPXFER;
 835                 dev_priv->wagp_enable = MGA_WAGP_ENABLE;
 836
 837                 dev_priv->status = drm_core_findmap(dev, init->status_offset);
 838                 if (!dev_priv->status) {
 839                         DRM_ERROR("failed to find status page!\n");
 840                         return DRM_ERR(EINVAL);
 841                 }
 842                 dev_priv->mmio = drm_core_findmap(dev, init->mmio_offset);
 843                 if (!dev_priv->mmio) {
 844                         DRM_ERROR("failed to find mmio region!\n");
 845                         return DRM_ERR(EINVAL);
 846                 }
 847                 dev_priv->warp = drm_core_findmap(dev, init->warp_offset);
 848                 if (!dev_priv->warp) {
 849                         DRM_ERROR("failed to find warp microcode region!\n");
 850                         return DRM_ERR(EINVAL);
 851                 }
 852                 dev_priv->primary = drm_core_findmap(dev, init->primary_offset);
 853                 if (!dev_priv->primary) {
 854                         DRM_ERROR("failed to find primary dma region!\n");
 855                         return DRM_ERR(EINVAL);
 856                 }
 857                 dev->agp_buffer_token = init->buffers_offset;
 858                 dev->agp_buffer_map =
 859                     drm_core_findmap(dev, init->buffers_offset);
 860                 if (!dev->agp_buffer_map) {
 861                         DRM_ERROR("failed to find dma buffer region!\n");
 862                         return DRM_ERR(EINVAL);
 863                 }
 864
 865                 drm_core_ioremap(dev_priv->warp, dev);
 866                 drm_core_ioremap(dev_priv->primary, dev);
 867                 drm_core_ioremap(dev->agp_buffer_map, dev);
 868         }
 869
 870         dev_priv->sarea_priv =
 871             (drm_mga_sarea_t *) ((u8 *) dev_priv->sarea->handle +
 872                                  init->sarea_priv_offset);
 873
 874         if (!dev_priv->warp->handle ||
 875             !dev_priv->primary->handle ||
 876             ((dev_priv->dma_access != 0) &&
 877              ((dev->agp_buffer_map == NULL) ||
 878               (dev->agp_buffer_map->handle == NULL)))) {
 879                 DRM_ERROR("failed to ioremap agp regions!\n");
 880                 return DRM_ERR(ENOMEM);
 881         }
 882
 883         ret = mga_warp_install_microcode(dev_priv);
 884         if (ret < 0) {
 885                 DRM_ERROR("failed to install WARP ucode!: %d\n", ret);
 886                 return ret;
 887         }
 888
 889         ret = mga_warp_init(dev_priv);
 890         if (ret < 0) {
 891                 DRM_ERROR("failed to init WARP engine!: %d\n", ret);
 892                 return ret;
 893         }
 894
 895         dev_priv->prim.status = (u32 *) dev_priv->status->handle;
 896
 897         mga_do_wait_for_idle(dev_priv);
 898
 899         /* Init the primary DMA registers.
 900          */
 901         MGA_WRITE(MGA_PRIMADDRESS, dev_priv->primary->offset | MGA_DMA_GENERAL);
 902 #if 0
 903         MGA_WRITE(MGA_PRIMPTR, virt_to_bus((void *)dev_priv->prim.status) | MGA_PRIMPTREN0 |    /* Soft trap, SECEND, SETUPEND */
 904                   MGA_PRIMPTREN1);      /* DWGSYNC */
 905 #endif
 906
 907         dev_priv->prim.start = (u8 *) dev_priv->primary->handle;
 908         dev_priv->prim.end = ((u8 *) dev_priv->primary->handle
 909                               + dev_priv->primary->size);
 910         dev_priv->prim.size = dev_priv->primary->size;
 911
 912         dev_priv->prim.tail = 0;
 913         dev_priv->prim.space = dev_priv->prim.size;
 914         dev_priv->prim.wrapped = 0;
 915
 916         dev_priv->prim.last_flush = 0;
 917         dev_priv->prim.last_wrap = 0;
 918
 919         dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
 920
 921         dev_priv->prim.status[0] = dev_priv->primary->offset;
 922         dev_priv->prim.status[1] = 0;
 923
 924         dev_priv->sarea_priv->last_wrap = 0;
 925         dev_priv->sarea_priv->last_frame.head = 0;
 926         dev_priv->sarea_priv->last_frame.wrap = 0;
 927
 928         if (mga_freelist_init(dev, dev_priv) < 0) {
 929                 DRM_ERROR("could not initialize freelist\n");
 930                 return DRM_ERR(ENOMEM);
 931         }
 932
 933         return 0;
 934 }
 935
 936 static int mga_do_cleanup_dma(struct drm_device *dev, int full_cleanup)
 937 {
 938         int err = 0;
 939         DRM_DEBUG("\n");
 940
 941         /* Make sure interrupts are disabled here because the uninstall ioctl
 942          * may not have been called from userspace and after dev_private
 943          * is freed, it's too late.
 944          */
 945         if (dev->irq_enabled)
 946                 drm_irq_uninstall(dev);
 947
 948         if (dev->dev_private) {
 949                 drm_mga_private_t *dev_priv = dev->dev_private;
 950
 951                 if ((dev_priv->warp != NULL)
 952                     && (dev_priv->warp->type != _DRM_CONSISTENT))
 953                         drm_core_ioremapfree(dev_priv->warp, dev);
 954
 955                 if ((dev_priv->primary != NULL)
 956                     && (dev_priv->primary->type != _DRM_CONSISTENT))
 957                         drm_core_ioremapfree(dev_priv->primary, dev);
 958
 959                 if (dev->agp_buffer_map != NULL)
 960                         drm_core_ioremapfree(dev->agp_buffer_map, dev);
 961
 962                 if (dev_priv->used_new_dma_init) {
 963 #if __OS_HAS_AGP
 964                         if (dev_priv->agp_handle != 0) {
 965                                 struct drm_agp_binding unbind_req;
 966                                 struct drm_agp_buffer free_req;
 967
 968                                 unbind_req.handle = dev_priv->agp_handle;
 969                                 drm_agp_unbind(dev, &unbind_req);
 970
 971                                 free_req.handle = dev_priv->agp_handle;
 972                                 drm_agp_free(dev, &free_req);
 973
 974                                 dev_priv->agp_textures = NULL;
 975                                 dev_priv->agp_size = 0;
 976                                 dev_priv->agp_handle = 0;
 977                         }
 978
 979                         if ((dev->agp != NULL) && dev->agp->acquired) {
 980                                 err = drm_agp_release(dev);
 981                         }
 982 #endif
 983                 }
 984
 985                 dev_priv->warp = NULL;
 986                 dev_priv->primary = NULL;
 987                 dev_priv->sarea = NULL;
 988                 dev_priv->sarea_priv = NULL;
 989                 dev->agp_buffer_map = NULL;
 990
 991                 if (full_cleanup) {
 992                         dev_priv->mmio = NULL;
 993                         dev_priv->status = NULL;
 994                         dev_priv->used_new_dma_init = 0;
 995                 }
 996
 997                 memset(&dev_priv->prim, 0, sizeof(dev_priv->prim));
 998                 dev_priv->warp_pipe = 0;
 999                 memset(dev_priv->warp_pipe_phys, 0,
1000                        sizeof(dev_priv->warp_pipe_phys));
1001
1002                 if (dev_priv->head != NULL) {
1003                         mga_freelist_cleanup(dev);
1004                 }
1005         }
1006
1007         return 0;
1008 }
1009
1010 int mga_dma_init(DRM_IOCTL_ARGS)
1011 {
1012         DRM_DEVICE;
1013         drm_mga_init_t init;
1014         int err;
1015
1016         LOCK_TEST_WITH_RETURN(dev, filp);
1017
1018         DRM_COPY_FROM_USER_IOCTL(init, (drm_mga_init_t __user *) data,
1019                                  sizeof(init));
1020
1021         switch (init.func) {
1022         case MGA_INIT_DMA:
1023                 err = mga_do_init_dma(dev, &init);
1024                 if (err) {
1025                         (void)mga_do_cleanup_dma(dev, FULL_CLEANUP);
1026                 }
1027                 return err;
1028         case MGA_CLEANUP_DMA:
1029                 return mga_do_cleanup_dma(dev, FULL_CLEANUP);
1030         }
1031
1032         return DRM_ERR(EINVAL);
1033 }
1034
1035 /* ================================================================
1036  * Primary DMA stream management
1037  */
1038
1039 int mga_dma_flush(DRM_IOCTL_ARGS)
1040 {
1041         DRM_DEVICE;
1042         drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1043         struct drm_lock lock;
1044
1045         LOCK_TEST_WITH_RETURN(dev, filp);
1046
1047         DRM_COPY_FROM_USER_IOCTL(lock, (struct drm_lock __user *) data,
1048                                  sizeof(lock));
1049
1050         DRM_DEBUG("%s%s%s\n",
1051                   (lock.flags & _DRM_LOCK_FLUSH) ? "flush, " : "",
1052                   (lock.flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
1053                   (lock.flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "");
1054
1055         WRAP_WAIT_WITH_RETURN(dev_priv);
1056
1057         if (lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL)) {
1058                 mga_do_dma_flush(dev_priv);
1059         }
1060
1061         if (lock.flags & _DRM_LOCK_QUIESCENT) {
1062 #if MGA_DMA_DEBUG
1063                 int ret = mga_do_wait_for_idle(dev_priv);
1064                 if (ret < 0)
1065                         DRM_INFO("%s: -EBUSY\n", __FUNCTION__);
1066                 return ret;
1067 #else
1068                 return mga_do_wait_for_idle(dev_priv);
1069 #endif
1070         } else {
1071                 return 0;
1072         }
1073 }
1074
1075 int mga_dma_reset(DRM_IOCTL_ARGS)
1076 {
1077         DRM_DEVICE;
1078         drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1079
1080         LOCK_TEST_WITH_RETURN(dev, filp);
1081
1082         return mga_do_dma_reset(dev_priv);
1083 }
1084
1085 /* ================================================================
1086  * DMA buffer management
1087  */
1088
1089 static int mga_dma_get_buffers(DRMFILE filp, struct drm_device * dev, struct drm_dma * d)
1090 {
1091         struct drm_buf *buf;
1092         int i;
1093
1094         for (i = d->granted_count; i < d->request_count; i++) {
1095                 buf = mga_freelist_get(dev);
1096                 if (!buf)
1097                         return DRM_ERR(EAGAIN);
1098
1099                 buf->filp = filp;
1100
1101                 if (DRM_COPY_TO_USER(&d->request_indices[i],
1102                                      &buf->idx, sizeof(buf->idx)))
1103                         return DRM_ERR(EFAULT);
1104                 if (DRM_COPY_TO_USER(&d->request_sizes[i],
1105                                      &buf->total, sizeof(buf->total)))
1106                         return DRM_ERR(EFAULT);
1107
1108                 d->granted_count++;
1109         }
1110         return 0;
1111 }
1112
1113 int mga_dma_buffers(DRM_IOCTL_ARGS)
1114 {
1115         DRM_DEVICE;
1116         struct drm_device_dma *dma = dev->dma;
1117         drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
1118         struct drm_dma __user *argp = (void __user *)data;
1119         struct drm_dma d;
1120         int ret = 0;
1121
1122         LOCK_TEST_WITH_RETURN(dev, filp);
1123
1124         DRM_COPY_FROM_USER_IOCTL(d, argp, sizeof(d));
1125
1126         /* Please don't send us buffers.
1127          */
1128         if (d.send_count != 0) {
1129                 DRM_ERROR("Process %d trying to send %d buffers via drmDMA\n",
1130                           DRM_CURRENTPID, d.send_count);
1131                 return DRM_ERR(EINVAL);
1132         }
1133
1134         /* We'll send you buffers.
1135          */
1136         if (d.request_count < 0 || d.request_count > dma->buf_count) {
1137                 DRM_ERROR("Process %d trying to get %d buffers (of %d max)\n",
1138                           DRM_CURRENTPID, d.request_count, dma->buf_count);
1139                 return DRM_ERR(EINVAL);
1140         }
1141
1142         WRAP_TEST_WITH_RETURN(dev_priv);
1143
1144         d.granted_count = 0;
1145
1146         if (d.request_count) {
1147                 ret = mga_dma_get_buffers(filp, dev, &d);
1148         }
1149
1150         DRM_COPY_TO_USER_IOCTL(argp, d, sizeof(d));
1151
1152         return ret;
1153 }
1154
1155 /**
1156  * Called just before the module is unloaded.
1157  */
1158 int mga_driver_unload(struct drm_device * dev)
1159 {
1160         drm_free(dev->dev_private, sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
1161         dev->dev_private = NULL;
1162
1163         return 0;
1164 }
1165
1166 /**
1167  * Called when the last opener of the device is closed.
1168  */
1169 void mga_driver_lastclose(struct drm_device * dev)
1170 {
1171         mga_do_cleanup_dma(dev, FULL_CLEANUP);
1172 }
1173
1174 int mga_driver_dma_quiescent(struct drm_device * dev)
1175 {
1176         drm_mga_private_t *dev_priv = dev->dev_private;
1177         return mga_do_wait_for_idle(dev_priv);
1178 }