drivers/video/fbdev/vermilion/vermilion.c

   1 /*
   2  * Copyright (c) Intel Corp. 2007.
   3  * All Rights Reserved.
   4  *
   5  * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   6  * develop this driver.
   7  *
   8  * This file is part of the Vermilion Range fb driver.
   9  * The Vermilion Range fb driver is free software;
  10  * you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * The Vermilion Range fb driver is distributed
  16  * in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this driver; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  *
  25  * Authors:
  26  *   Thomas Hellström <thomas-at-tungstengraphics-dot-com>
  27  *   Michel Dänzer <michel-at-tungstengraphics-dot-com>
  28  *   Alan Hourihane <alanh-at-tungstengraphics-dot-com>
  29  */
  30
  31 #include <linux/module.h>
  32 #include <linux/kernel.h>
  33 #include <linux/errno.h>
  34 #include <linux/string.h>
  35 #include <linux/delay.h>
  36 #include <linux/slab.h>
  37 #include <linux/mm.h>
  38 #include <linux/fb.h>
  39 #include <linux/pci.h>
  40 #include <asm/cacheflush.h>
  41 #include <asm/tlbflush.h>
  42 #include <linux/mmzone.h>
  43
  44 /* #define VERMILION_DEBUG */
  45
  46 #include "vermilion.h"
  47
  48 #define MODULE_NAME "vmlfb"
  49
  50 #define VML_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
  51
  52 static struct mutex vml_mutex;
  53 static struct list_head global_no_mode;
  54 static struct list_head global_has_mode;
  55 static struct fb_ops vmlfb_ops;
  56 static struct vml_sys *subsys = NULL;
  57 static char *vml_default_mode = "1024x768@60";
  58 static struct fb_videomode defaultmode = {
  59         NULL, 60, 1024, 768, 12896, 144, 24, 29, 3, 136, 6,
  60         0, FB_VMODE_NONINTERLACED
  61 };
  62
  63 static u32 vml_mem_requested = (10 * 1024 * 1024);
  64 static u32 vml_mem_contig = (4 * 1024 * 1024);
  65 static u32 vml_mem_min = (4 * 1024 * 1024);
  66
  67 static u32 vml_clocks[] = {
  68         6750,
  69         13500,
  70         27000,
  71         29700,
  72         37125,
  73         54000,
  74         59400,
  75         74250,
  76         120000,
  77         148500
  78 };
  79
  80 static u32 vml_num_clocks = ARRAY_SIZE(vml_clocks);
  81
  82 /*
  83  * Allocate a contiguous vram area and make its linear kernel map
  84  * uncached.
  85  */
  86
  87 static int vmlfb_alloc_vram_area(struct vram_area *va, unsigned max_order,
  88                                  unsigned min_order)
  89 {
  90         gfp_t flags;
  91         unsigned long i;
  92
  93         max_order++;
  94         do {
  95                 /*
  96                  * Really try hard to get the needed memory.
  97                  * We need memory below the first 32MB, so we
  98                  * add the __GFP_DMA flag that guarantees that we are
  99                  * below the first 16MB.
 100                  */
 101
 102                 flags = __GFP_DMA | __GFP_HIGH;
 103                 va->logical =
 104                          __get_free_pages(flags, --max_order);
 105         } while (va->logical == 0 && max_order > min_order);
 106
 107         if (!va->logical)
 108                 return -ENOMEM;
 109
 110         va->phys = virt_to_phys((void *)va->logical);
 111         va->size = PAGE_SIZE << max_order;
 112         va->order = max_order;
 113
 114         /*
 115          * It seems like __get_free_pages only ups the usage count
 116          * of the first page. This doesn't work with fault mapping, so
 117          * up the usage count once more (XXX: should use split_page or
 118          * compound page).
 119          */
 120
 121         memset((void *)va->logical, 0x00, va->size);
 122         for (i = va->logical; i < va->logical + va->size; i += PAGE_SIZE) {
 123                 get_page(virt_to_page(i));
 124         }
 125
 126         /*
 127          * Change caching policy of the linear kernel map to avoid
 128          * mapping type conflicts with user-space mappings.
 129          */
 130         set_pages_uc(virt_to_page(va->logical), va->size >> PAGE_SHIFT);
 131
 132         printk(KERN_DEBUG MODULE_NAME
 133                ": Allocated %ld bytes vram area at 0x%08lx\n",
 134                va->size, va->phys);
 135
 136         return 0;
 137 }
 138
 139 /*
 140  * Free a contiguous vram area and reset its linear kernel map
 141  * mapping type.
 142  */
 143
 144 static void vmlfb_free_vram_area(struct vram_area *va)
 145 {
 146         unsigned long j;
 147
 148         if (va->logical) {
 149
 150                 /*
 151                  * Reset the linear kernel map caching policy.
 152                  */
 153
 154                 set_pages_wb(virt_to_page(va->logical),
 155                                  va->size >> PAGE_SHIFT);
 156
 157                 /*
 158                  * Decrease the usage count on the pages we've used
 159                  * to compensate for upping when allocating.
 160                  */
 161
 162                 for (j = va->logical; j < va->logical + va->size;
 163                      j += PAGE_SIZE) {
 164                         (void)put_page_testzero(virt_to_page(j));
 165                 }
 166
 167                 printk(KERN_DEBUG MODULE_NAME
 168                        ": Freeing %ld bytes vram area at 0x%08lx\n",
 169                        va->size, va->phys);
 170                 free_pages(va->logical, va->order);
 171
 172                 va->logical = 0;
 173         }
 174 }
 175
 176 /*
 177  * Free allocated vram.
 178  */
 179
 180 static void vmlfb_free_vram(struct vml_info *vinfo)
 181 {
 182         int i;
 183
 184         for (i = 0; i < vinfo->num_areas; ++i) {
 185                 vmlfb_free_vram_area(&vinfo->vram[i]);
 186         }
 187         vinfo->num_areas = 0;
 188 }
 189
 190 /*
 191  * Allocate vram. Currently we try to allocate contiguous areas from the
 192  * __GFP_DMA zone and puzzle them together. A better approach would be to
 193  * allocate one contiguous area for scanout and use one-page allocations for
 194  * offscreen areas. This requires user-space and GPU virtual mappings.
 195  */
 196
 197 static int vmlfb_alloc_vram(struct vml_info *vinfo,
 198                             size_t requested,
 199                             size_t min_total, size_t min_contig)
 200 {
 201         int i, j;
 202         int order;
 203         int contiguous;
 204         int err;
 205         struct vram_area *va;
 206         struct vram_area *va2;
 207
 208         vinfo->num_areas = 0;
 209         for (i = 0; i < VML_VRAM_AREAS; ++i) {
 210                 va = &vinfo->vram[i];
 211                 order = 0;
 212
 213                 while (requested > (PAGE_SIZE << order) && order < MAX_ORDER)
 214                         order++;
 215
 216                 err = vmlfb_alloc_vram_area(va, order, 0);
 217
 218                 if (err)
 219                         break;
 220
 221                 if (i == 0) {
 222                         vinfo->vram_start = va->phys;
 223                         vinfo->vram_logical = (void __iomem *) va->logical;
 224                         vinfo->vram_contig_size = va->size;
 225                         vinfo->num_areas = 1;
 226                 } else {
 227                         contiguous = 0;
 228
 229                         for (j = 0; j < i; ++j) {
 230                                 va2 = &vinfo->vram[j];
 231                                 if (va->phys + va->size == va2->phys ||
 232                                     va2->phys + va2->size == va->phys) {
 233                                         contiguous = 1;
 234                                         break;
 235                                 }
 236                         }
 237
 238                         if (contiguous) {
 239                                 vinfo->num_areas++;
 240                                 if (va->phys < vinfo->vram_start) {
 241                                         vinfo->vram_start = va->phys;
 242                                         vinfo->vram_logical =
 243                                                 (void __iomem *)va->logical;
 244                                 }
 245                                 vinfo->vram_contig_size += va->size;
 246                         } else {
 247                                 vmlfb_free_vram_area(va);
 248                                 break;
 249                         }
 250                 }
 251
 252                 if (requested < va->size)
 253                         break;
 254                 else
 255                         requested -= va->size;
 256         }
 257
 258         if (vinfo->vram_contig_size > min_total &&
 259             vinfo->vram_contig_size > min_contig) {
 260
 261                 printk(KERN_DEBUG MODULE_NAME
 262                        ": Contiguous vram: %ld bytes at physical 0x%08lx.\n",
 263                        (unsigned long)vinfo->vram_contig_size,
 264                        (unsigned long)vinfo->vram_start);
 265
 266                 return 0;
 267         }
 268
 269         printk(KERN_ERR MODULE_NAME
 270                ": Could not allocate requested minimal amount of vram.\n");
 271
 272         vmlfb_free_vram(vinfo);
 273
 274         return -ENOMEM;
 275 }
 276
 277 /*
 278  * Find the GPU to use with our display controller.
 279  */
 280
 281 static int vmlfb_get_gpu(struct vml_par *par)
 282 {
 283         mutex_lock(&vml_mutex);
 284
 285         par->gpu = pci_get_device(PCI_VENDOR_ID_INTEL, VML_DEVICE_GPU, NULL);
 286
 287         if (!par->gpu) {
 288                 mutex_unlock(&vml_mutex);
 289                 return -ENODEV;
 290         }
 291
 292         mutex_unlock(&vml_mutex);
 293
 294         if (pci_enable_device(par->gpu) < 0)
 295                 return -ENODEV;
 296
 297         return 0;
 298 }
 299
 300 /*
 301  * Find a contiguous vram area that contains a given offset from vram start.
 302  */
 303 static int vmlfb_vram_offset(struct vml_info *vinfo, unsigned long offset)
 304 {
 305         unsigned long aoffset;
 306         unsigned i;
 307
 308         for (i = 0; i < vinfo->num_areas; ++i) {
 309                 aoffset = offset - (vinfo->vram[i].phys - vinfo->vram_start);
 310
 311                 if (aoffset < vinfo->vram[i].size) {
 312                         return 0;
 313                 }
 314         }
 315
 316         return -EINVAL;
 317 }
 318
 319 /*
 320  * Remap the MMIO register spaces of the VDC and the GPU.
 321  */
 322
 323 static int vmlfb_enable_mmio(struct vml_par *par)
 324 {
 325         int err;
 326
 327         par->vdc_mem_base = pci_resource_start(par->vdc, 0);
 328         par->vdc_mem_size = pci_resource_len(par->vdc, 0);
 329         if (!request_mem_region(par->vdc_mem_base, par->vdc_mem_size, "vmlfb")) {
 330                 printk(KERN_ERR MODULE_NAME
 331                        ": Could not claim display controller MMIO.\n");
 332                 return -EBUSY;
 333         }
 334         par->vdc_mem = ioremap_nocache(par->vdc_mem_base, par->vdc_mem_size);
 335         if (par->vdc_mem == NULL) {
 336                 printk(KERN_ERR MODULE_NAME
 337                        ": Could not map display controller MMIO.\n");
 338                 err = -ENOMEM;
 339                 goto out_err_0;
 340         }
 341
 342         par->gpu_mem_base = pci_resource_start(par->gpu, 0);
 343         par->gpu_mem_size = pci_resource_len(par->gpu, 0);
 344         if (!request_mem_region(par->gpu_mem_base, par->gpu_mem_size, "vmlfb")) {
 345                 printk(KERN_ERR MODULE_NAME ": Could not claim GPU MMIO.\n");
 346                 err = -EBUSY;
 347                 goto out_err_1;
 348         }
 349         par->gpu_mem = ioremap_nocache(par->gpu_mem_base, par->gpu_mem_size);
 350         if (par->gpu_mem == NULL) {
 351                 printk(KERN_ERR MODULE_NAME ": Could not map GPU MMIO.\n");
 352                 err = -ENOMEM;
 353                 goto out_err_2;
 354         }
 355
 356         return 0;
 357
 358 out_err_2:
 359         release_mem_region(par->gpu_mem_base, par->gpu_mem_size);
 360 out_err_1:
 361         iounmap(par->vdc_mem);
 362 out_err_0:
 363         release_mem_region(par->vdc_mem_base, par->vdc_mem_size);
 364         return err;
 365 }
 366
 367 /*
 368  * Unmap the VDC and GPU register spaces.
 369  */
 370
 371 static void vmlfb_disable_mmio(struct vml_par *par)
 372 {
 373         iounmap(par->gpu_mem);
 374         release_mem_region(par->gpu_mem_base, par->gpu_mem_size);
 375         iounmap(par->vdc_mem);
 376         release_mem_region(par->vdc_mem_base, par->vdc_mem_size);
 377 }
 378
 379 /*
 380  * Release and uninit the VDC and GPU.
 381  */
 382
 383 static void vmlfb_release_devices(struct vml_par *par)
 384 {
 385         if (atomic_dec_and_test(&par->refcount)) {
 386                 pci_disable_device(par->gpu);
 387                 pci_disable_device(par->vdc);
 388         }
 389 }
 390
 391 /*
 392  * Free up allocated resources for a device.
 393  */
 394
 395 static void vml_pci_remove(struct pci_dev *dev)
 396 {
 397         struct fb_info *info;
 398         struct vml_info *vinfo;
 399         struct vml_par *par;
 400
 401         info = pci_get_drvdata(dev);
 402         if (info) {
 403                 vinfo = container_of(info, struct vml_info, info);
 404                 par = vinfo->par;
 405                 mutex_lock(&vml_mutex);
 406                 unregister_framebuffer(info);
 407                 fb_dealloc_cmap(&info->cmap);
 408                 vmlfb_free_vram(vinfo);
 409                 vmlfb_disable_mmio(par);
 410                 vmlfb_release_devices(par);
 411                 kfree(vinfo);
 412                 kfree(par);
 413                 mutex_unlock(&vml_mutex);
 414         }
 415 }
 416
 417 static void vmlfb_set_pref_pixel_format(struct fb_var_screeninfo *var)
 418 {
 419         switch (var->bits_per_pixel) {
 420         case 16:
 421                 var->blue.offset = 0;
 422                 var->blue.length = 5;
 423                 var->green.offset = 5;
 424                 var->green.length = 5;
 425                 var->red.offset = 10;
 426                 var->red.length = 5;
 427                 var->transp.offset = 15;
 428                 var->transp.length = 1;
 429                 break;
 430         case 32:
 431                 var->blue.offset = 0;
 432                 var->blue.length = 8;
 433                 var->green.offset = 8;
 434                 var->green.length = 8;
 435                 var->red.offset = 16;
 436                 var->red.length = 8;
 437                 var->transp.offset = 24;
 438                 var->transp.length = 0;
 439                 break;
 440         default:
 441                 break;
 442         }
 443
 444         var->blue.msb_right = var->green.msb_right =
 445             var->red.msb_right = var->transp.msb_right = 0;
 446 }
 447
 448 /*
 449  * Device initialization.
 450  * We initialize one vml_par struct per device and one vml_info
 451  * struct per pipe. Currently we have only one pipe.
 452  */
 453
 454 static int vml_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 455 {
 456         struct vml_info *vinfo;
 457         struct fb_info *info;
 458         struct vml_par *par;
 459         int err = 0;
 460
 461         par = kzalloc(sizeof(*par), GFP_KERNEL);
 462         if (par == NULL)
 463                 return -ENOMEM;
 464
 465         vinfo = kzalloc(sizeof(*vinfo), GFP_KERNEL);
 466         if (vinfo == NULL) {
 467                 err = -ENOMEM;
 468                 goto out_err_0;
 469         }
 470
 471         vinfo->par = par;
 472         par->vdc = dev;
 473         atomic_set(&par->refcount, 1);
 474
 475         switch (id->device) {
 476         case VML_DEVICE_VDC:
 477                 if ((err = vmlfb_get_gpu(par)))
 478                         goto out_err_1;
 479                 pci_set_drvdata(dev, &vinfo->info);
 480                 break;
 481         default:
 482                 err = -ENODEV;
 483                 goto out_err_1;
 484                 break;
 485         }
 486
 487         info = &vinfo->info;
 488         info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK;
 489
 490         err = vmlfb_enable_mmio(par);
 491         if (err)
 492                 goto out_err_2;
 493
 494         err = vmlfb_alloc_vram(vinfo, vml_mem_requested,
 495                                vml_mem_contig, vml_mem_min);
 496         if (err)
 497                 goto out_err_3;
 498
 499         strcpy(info->fix.id, "Vermilion Range");
 500         info->fix.mmio_start = 0;
 501         info->fix.mmio_len = 0;
 502         info->fix.smem_start = vinfo->vram_start;
 503         info->fix.smem_len = vinfo->vram_contig_size;
 504         info->fix.type = FB_TYPE_PACKED_PIXELS;
 505         info->fix.visual = FB_VISUAL_TRUECOLOR;
 506         info->fix.ypanstep = 1;
 507         info->fix.xpanstep = 1;
 508         info->fix.ywrapstep = 0;
 509         info->fix.accel = FB_ACCEL_NONE;
 510         info->screen_base = vinfo->vram_logical;
 511         info->pseudo_palette = vinfo->pseudo_palette;
 512         info->par = par;
 513         info->fbops = &vmlfb_ops;
 514         info->device = &dev->dev;
 515
 516         INIT_LIST_HEAD(&vinfo->head);
 517         vinfo->pipe_disabled = 1;
 518         vinfo->cur_blank_mode = FB_BLANK_UNBLANK;
 519
 520         info->var.grayscale = 0;
 521         info->var.bits_per_pixel = 16;
 522         vmlfb_set_pref_pixel_format(&info->var);
 523
 524         if (!fb_find_mode
 525             (&info->var, info, vml_default_mode, NULL, 0, &defaultmode, 16)) {
 526                 printk(KERN_ERR MODULE_NAME ": Could not find initial mode\n");
 527         }
 528
 529         if (fb_alloc_cmap(&info->cmap, 256, 1) < 0) {
 530                 err = -ENOMEM;
 531                 goto out_err_4;
 532         }
 533
 534         err = register_framebuffer(info);
 535         if (err) {
 536                 printk(KERN_ERR MODULE_NAME ": Register framebuffer error.\n");
 537                 goto out_err_5;
 538         }
 539
 540         printk("Initialized vmlfb\n");
 541
 542         return 0;
 543
 544 out_err_5:
 545         fb_dealloc_cmap(&info->cmap);
 546 out_err_4:
 547         vmlfb_free_vram(vinfo);
 548 out_err_3:
 549         vmlfb_disable_mmio(par);
 550 out_err_2:
 551         vmlfb_release_devices(par);
 552 out_err_1:
 553         kfree(vinfo);
 554 out_err_0:
 555         kfree(par);
 556         return err;
 557 }
 558
 559 static int vmlfb_open(struct fb_info *info, int user)
 560 {
 561         /*
 562          * Save registers here?
 563          */
 564         return 0;
 565 }
 566
 567 static int vmlfb_release(struct fb_info *info, int user)
 568 {
 569         /*
 570          * Restore registers here.
 571          */
 572
 573         return 0;
 574 }
 575
 576 static int vml_nearest_clock(int clock)
 577 {
 578
 579         int i;
 580         int cur_index;
 581         int cur_diff;
 582         int diff;
 583
 584         cur_index = 0;
 585         cur_diff = clock - vml_clocks[0];
 586         cur_diff = (cur_diff < 0) ? -cur_diff : cur_diff;
 587         for (i = 1; i < vml_num_clocks; ++i) {
 588                 diff = clock - vml_clocks[i];
 589                 diff = (diff < 0) ? -diff : diff;
 590                 if (diff < cur_diff) {
 591                         cur_index = i;
 592                         cur_diff = diff;
 593                 }
 594         }
 595         return vml_clocks[cur_index];
 596 }
 597
 598 static int vmlfb_check_var_locked(struct fb_var_screeninfo *var,
 599                                   struct vml_info *vinfo)
 600 {
 601         u32 pitch;
 602         u64 mem;
 603         int nearest_clock;
 604         int clock;
 605         int clock_diff;
 606         struct fb_var_screeninfo v;
 607
 608         v = *var;
 609         clock = PICOS2KHZ(var->pixclock);
 610
 611         if (subsys && subsys->nearest_clock) {
 612                 nearest_clock = subsys->nearest_clock(subsys, clock);
 613         } else {
 614                 nearest_clock = vml_nearest_clock(clock);
 615         }
 616
 617         /*
 618          * Accept a 20% diff.
 619          */
 620
 621         clock_diff = nearest_clock - clock;
 622         clock_diff = (clock_diff < 0) ? -clock_diff : clock_diff;
 623         if (clock_diff > clock / 5) {
 624 #if 0
 625                 printk(KERN_DEBUG MODULE_NAME ": Diff failure. %d %d\n",clock_diff,clock);
 626 #endif
 627                 return -EINVAL;
 628         }
 629
 630         v.pixclock = KHZ2PICOS(nearest_clock);
 631
 632         if (var->xres > VML_MAX_XRES || var->yres > VML_MAX_YRES) {
 633                 printk(KERN_DEBUG MODULE_NAME ": Resolution failure.\n");
 634                 return -EINVAL;
 635         }
 636         if (var->xres_virtual > VML_MAX_XRES_VIRTUAL) {
 637                 printk(KERN_DEBUG MODULE_NAME
 638                        ": Virtual resolution failure.\n");
 639                 return -EINVAL;
 640         }
 641         switch (v.bits_per_pixel) {
 642         case 0 ... 16:
 643                 v.bits_per_pixel = 16;
 644                 break;
 645         case 17 ... 32:
 646                 v.bits_per_pixel = 32;
 647                 break;
 648         default:
 649                 printk(KERN_DEBUG MODULE_NAME ": Invalid bpp: %d.\n",
 650                        var->bits_per_pixel);
 651                 return -EINVAL;
 652         }
 653
 654         pitch = ALIGN((var->xres * var->bits_per_pixel) >> 3, 0x40);
 655         mem = pitch * var->yres_virtual;
 656         if (mem > vinfo->vram_contig_size) {
 657                 return -ENOMEM;
 658         }
 659
 660         switch (v.bits_per_pixel) {
 661         case 16:
 662                 if (var->blue.offset != 0 ||
 663                     var->blue.length != 5 ||
 664                     var->green.offset != 5 ||
 665                     var->green.length != 5 ||
 666                     var->red.offset != 10 ||
 667                     var->red.length != 5 ||
 668                     var->transp.offset != 15 || var->transp.length != 1) {
 669                         vmlfb_set_pref_pixel_format(&v);
 670                 }
 671                 break;
 672         case 32:
 673                 if (var->blue.offset != 0 ||
 674                     var->blue.length != 8 ||
 675                     var->green.offset != 8 ||
 676                     var->green.length != 8 ||
 677                     var->red.offset != 16 ||
 678                     var->red.length != 8 ||
 679                     (var->transp.length != 0 && var->transp.length != 8) ||
 680                     (var->transp.length == 8 && var->transp.offset != 24)) {
 681                         vmlfb_set_pref_pixel_format(&v);
 682                 }
 683                 break;
 684         default:
 685                 return -EINVAL;
 686         }
 687
 688         *var = v;
 689
 690         return 0;
 691 }
 692
 693 static int vmlfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 694 {
 695         struct vml_info *vinfo = container_of(info, struct vml_info, info);
 696         int ret;
 697
 698         mutex_lock(&vml_mutex);
 699         ret = vmlfb_check_var_locked(var, vinfo);
 700         mutex_unlock(&vml_mutex);
 701
 702         return ret;
 703 }
 704
 705 static void vml_wait_vblank(struct vml_info *vinfo)
 706 {
 707         /* Wait for vblank. For now, just wait for a 50Hz cycle (20ms)) */
 708         mdelay(20);
 709 }
 710
 711 static void vmlfb_disable_pipe(struct vml_info *vinfo)
 712 {
 713         struct vml_par *par = vinfo->par;
 714
 715         /* Disable the MDVO pad */
 716         VML_WRITE32(par, VML_RCOMPSTAT, 0);
 717         while (!(VML_READ32(par, VML_RCOMPSTAT) & VML_MDVO_VDC_I_RCOMP)) ;
 718
 719         /* Disable display planes */
 720         VML_WRITE32(par, VML_DSPCCNTR,
 721                     VML_READ32(par, VML_DSPCCNTR) & ~VML_GFX_ENABLE);
 722         (void)VML_READ32(par, VML_DSPCCNTR);
 723         /* Wait for vblank for the disable to take effect */
 724         vml_wait_vblank(vinfo);
 725
 726         /* Next, disable display pipes */
 727         VML_WRITE32(par, VML_PIPEACONF, 0);
 728         (void)VML_READ32(par, VML_PIPEACONF);
 729
 730         vinfo->pipe_disabled = 1;
 731 }
 732
 733 #ifdef VERMILION_DEBUG
 734 static void vml_dump_regs(struct vml_info *vinfo)
 735 {
 736         struct vml_par *par = vinfo->par;
 737
 738         printk(KERN_DEBUG MODULE_NAME ": Modesetting register dump:\n");
 739         printk(KERN_DEBUG MODULE_NAME ": \tHTOTAL_A         : 0x%08x\n",
 740                (unsigned)VML_READ32(par, VML_HTOTAL_A));
 741         printk(KERN_DEBUG MODULE_NAME ": \tHBLANK_A         : 0x%08x\n",
 742                (unsigned)VML_READ32(par, VML_HBLANK_A));
 743         printk(KERN_DEBUG MODULE_NAME ": \tHSYNC_A          : 0x%08x\n",
 744                (unsigned)VML_READ32(par, VML_HSYNC_A));
 745         printk(KERN_DEBUG MODULE_NAME ": \tVTOTAL_A         : 0x%08x\n",
 746                (unsigned)VML_READ32(par, VML_VTOTAL_A));
 747         printk(KERN_DEBUG MODULE_NAME ": \tVBLANK_A         : 0x%08x\n",
 748                (unsigned)VML_READ32(par, VML_VBLANK_A));
 749         printk(KERN_DEBUG MODULE_NAME ": \tVSYNC_A          : 0x%08x\n",
 750                (unsigned)VML_READ32(par, VML_VSYNC_A));
 751         printk(KERN_DEBUG MODULE_NAME ": \tDSPCSTRIDE       : 0x%08x\n",
 752                (unsigned)VML_READ32(par, VML_DSPCSTRIDE));
 753         printk(KERN_DEBUG MODULE_NAME ": \tDSPCSIZE         : 0x%08x\n",
 754                (unsigned)VML_READ32(par, VML_DSPCSIZE));
 755         printk(KERN_DEBUG MODULE_NAME ": \tDSPCPOS          : 0x%08x\n",
 756                (unsigned)VML_READ32(par, VML_DSPCPOS));
 757         printk(KERN_DEBUG MODULE_NAME ": \tDSPARB           : 0x%08x\n",
 758                (unsigned)VML_READ32(par, VML_DSPARB));
 759         printk(KERN_DEBUG MODULE_NAME ": \tDSPCADDR         : 0x%08x\n",
 760                (unsigned)VML_READ32(par, VML_DSPCADDR));
 761         printk(KERN_DEBUG MODULE_NAME ": \tBCLRPAT_A        : 0x%08x\n",
 762                (unsigned)VML_READ32(par, VML_BCLRPAT_A));
 763         printk(KERN_DEBUG MODULE_NAME ": \tCANVSCLR_A       : 0x%08x\n",
 764                (unsigned)VML_READ32(par, VML_CANVSCLR_A));
 765         printk(KERN_DEBUG MODULE_NAME ": \tPIPEASRC         : 0x%08x\n",
 766                (unsigned)VML_READ32(par, VML_PIPEASRC));
 767         printk(KERN_DEBUG MODULE_NAME ": \tPIPEACONF        : 0x%08x\n",
 768                (unsigned)VML_READ32(par, VML_PIPEACONF));
 769         printk(KERN_DEBUG MODULE_NAME ": \tDSPCCNTR         : 0x%08x\n",
 770                (unsigned)VML_READ32(par, VML_DSPCCNTR));
 771         printk(KERN_DEBUG MODULE_NAME ": \tRCOMPSTAT        : 0x%08x\n",
 772                (unsigned)VML_READ32(par, VML_RCOMPSTAT));
 773         printk(KERN_DEBUG MODULE_NAME ": End of modesetting register dump.\n");
 774 }
 775 #endif
 776
 777 static int vmlfb_set_par_locked(struct vml_info *vinfo)
 778 {
 779         struct vml_par *par = vinfo->par;
 780         struct fb_info *info = &vinfo->info;
 781         struct fb_var_screeninfo *var = &info->var;
 782         u32 htotal, hactive, hblank_start, hblank_end, hsync_start, hsync_end;
 783         u32 vtotal, vactive, vblank_start, vblank_end, vsync_start, vsync_end;
 784         u32 dspcntr;
 785         int clock;
 786
 787         vinfo->bytes_per_pixel = var->bits_per_pixel >> 3;
 788         vinfo->stride = ALIGN(var->xres_virtual * vinfo->bytes_per_pixel, 0x40);
 789         info->fix.line_length = vinfo->stride;
 790
 791         if (!subsys)
 792                 return 0;
 793
 794         htotal =
 795             var->xres + var->right_margin + var->hsync_len + var->left_margin;
 796         hactive = var->xres;
 797         hblank_start = var->xres;
 798         hblank_end = htotal;
 799         hsync_start = hactive + var->right_margin;
 800         hsync_end = hsync_start + var->hsync_len;
 801
 802         vtotal =
 803             var->yres + var->lower_margin + var->vsync_len + var->upper_margin;
 804         vactive = var->yres;
 805         vblank_start = var->yres;
 806         vblank_end = vtotal;
 807         vsync_start = vactive + var->lower_margin;
 808         vsync_end = vsync_start + var->vsync_len;
 809
 810         dspcntr = VML_GFX_ENABLE | VML_GFX_GAMMABYPASS;
 811         clock = PICOS2KHZ(var->pixclock);
 812
 813         if (subsys->nearest_clock) {
 814                 clock = subsys->nearest_clock(subsys, clock);
 815         } else {
 816                 clock = vml_nearest_clock(clock);
 817         }
 818         printk(KERN_DEBUG MODULE_NAME
 819                ": Set mode Hfreq : %d kHz, Vfreq : %d Hz.\n", clock / htotal,
 820                ((clock / htotal) * 1000) / vtotal);
 821
 822         switch (var->bits_per_pixel) {
 823         case 16:
 824                 dspcntr |= VML_GFX_ARGB1555;
 825                 break;
 826         case 32:
 827                 if (var->transp.length == 8)
 828                         dspcntr |= VML_GFX_ARGB8888 | VML_GFX_ALPHAMULT;
 829                 else
 830                         dspcntr |= VML_GFX_RGB0888;
 831                 break;
 832         default:
 833                 return -EINVAL;
 834         }
 835
 836         vmlfb_disable_pipe(vinfo);
 837         mb();
 838
 839         if (subsys->set_clock)
 840                 subsys->set_clock(subsys, clock);
 841         else
 842                 return -EINVAL;
 843
 844         VML_WRITE32(par, VML_HTOTAL_A, ((htotal - 1) << 16) | (hactive - 1));
 845         VML_WRITE32(par, VML_HBLANK_A,
 846                     ((hblank_end - 1) << 16) | (hblank_start - 1));
 847         VML_WRITE32(par, VML_HSYNC_A,
 848                     ((hsync_end - 1) << 16) | (hsync_start - 1));
 849         VML_WRITE32(par, VML_VTOTAL_A, ((vtotal - 1) << 16) | (vactive - 1));
 850         VML_WRITE32(par, VML_VBLANK_A,
 851                     ((vblank_end - 1) << 16) | (vblank_start - 1));
 852         VML_WRITE32(par, VML_VSYNC_A,
 853                     ((vsync_end - 1) << 16) | (vsync_start - 1));
 854         VML_WRITE32(par, VML_DSPCSTRIDE, vinfo->stride);
 855         VML_WRITE32(par, VML_DSPCSIZE,
 856                     ((var->yres - 1) << 16) | (var->xres - 1));
 857         VML_WRITE32(par, VML_DSPCPOS, 0x00000000);
 858         VML_WRITE32(par, VML_DSPARB, VML_FIFO_DEFAULT);
 859         VML_WRITE32(par, VML_BCLRPAT_A, 0x00000000);
 860         VML_WRITE32(par, VML_CANVSCLR_A, 0x00000000);
 861         VML_WRITE32(par, VML_PIPEASRC,
 862                     ((var->xres - 1) << 16) | (var->yres - 1));
 863
 864         wmb();
 865         VML_WRITE32(par, VML_PIPEACONF, VML_PIPE_ENABLE);
 866         wmb();
 867         VML_WRITE32(par, VML_DSPCCNTR, dspcntr);
 868         wmb();
 869         VML_WRITE32(par, VML_DSPCADDR, (u32) vinfo->vram_start +
 870                     var->yoffset * vinfo->stride +
 871                     var->xoffset * vinfo->bytes_per_pixel);
 872
 873         VML_WRITE32(par, VML_RCOMPSTAT, VML_MDVO_PAD_ENABLE);
 874
 875         while (!(VML_READ32(par, VML_RCOMPSTAT) &
 876                  (VML_MDVO_VDC_I_RCOMP | VML_MDVO_PAD_ENABLE))) ;
 877
 878         vinfo->pipe_disabled = 0;
 879 #ifdef VERMILION_DEBUG
 880         vml_dump_regs(vinfo);
 881 #endif
 882
 883         return 0;
 884 }
 885
 886 static int vmlfb_set_par(struct fb_info *info)
 887 {
 888         struct vml_info *vinfo = container_of(info, struct vml_info, info);
 889         int ret;
 890
 891         mutex_lock(&vml_mutex);
 892         list_move(&vinfo->head, (subsys) ? &global_has_mode : &global_no_mode);
 893         ret = vmlfb_set_par_locked(vinfo);
 894
 895         mutex_unlock(&vml_mutex);
 896         return ret;
 897 }
 898
 899 static int vmlfb_blank_locked(struct vml_info *vinfo)
 900 {
 901         struct vml_par *par = vinfo->par;
 902         u32 cur = VML_READ32(par, VML_PIPEACONF);
 903
 904         switch (vinfo->cur_blank_mode) {
 905         case FB_BLANK_UNBLANK:
 906                 if (vinfo->pipe_disabled) {
 907                         vmlfb_set_par_locked(vinfo);
 908                 }
 909                 VML_WRITE32(par, VML_PIPEACONF, cur & ~VML_PIPE_FORCE_BORDER);
 910                 (void)VML_READ32(par, VML_PIPEACONF);
 911                 break;
 912         case FB_BLANK_NORMAL:
 913                 if (vinfo->pipe_disabled) {
 914                         vmlfb_set_par_locked(vinfo);
 915                 }
 916                 VML_WRITE32(par, VML_PIPEACONF, cur | VML_PIPE_FORCE_BORDER);
 917                 (void)VML_READ32(par, VML_PIPEACONF);
 918                 break;
 919         case FB_BLANK_VSYNC_SUSPEND:
 920         case FB_BLANK_HSYNC_SUSPEND:
 921                 if (!vinfo->pipe_disabled) {
 922                         vmlfb_disable_pipe(vinfo);
 923                 }
 924                 break;
 925         case FB_BLANK_POWERDOWN:
 926                 if (!vinfo->pipe_disabled) {
 927                         vmlfb_disable_pipe(vinfo);
 928                 }
 929                 break;
 930         default:
 931                 return -EINVAL;
 932         }
 933
 934         return 0;
 935 }
 936
 937 static int vmlfb_blank(int blank_mode, struct fb_info *info)
 938 {
 939         struct vml_info *vinfo = container_of(info, struct vml_info, info);
 940         int ret;
 941
 942         mutex_lock(&vml_mutex);
 943         vinfo->cur_blank_mode = blank_mode;
 944         ret = vmlfb_blank_locked(vinfo);
 945         mutex_unlock(&vml_mutex);
 946         return ret;
 947 }
 948
 949 static int vmlfb_pan_display(struct fb_var_screeninfo *var,
 950                              struct fb_info *info)
 951 {
 952         struct vml_info *vinfo = container_of(info, struct vml_info, info);
 953         struct vml_par *par = vinfo->par;
 954
 955         mutex_lock(&vml_mutex);
 956         VML_WRITE32(par, VML_DSPCADDR, (u32) vinfo->vram_start +
 957                     var->yoffset * vinfo->stride +
 958                     var->xoffset * vinfo->bytes_per_pixel);
 959         (void)VML_READ32(par, VML_DSPCADDR);
 960         mutex_unlock(&vml_mutex);
 961
 962         return 0;
 963 }
 964
 965 static int vmlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 966                            u_int transp, struct fb_info *info)
 967 {
 968         u32 v;
 969
 970         if (regno >= 16)
 971                 return -EINVAL;
 972
 973         if (info->var.grayscale) {
 974                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 975         }
 976
 977         if (info->fix.visual != FB_VISUAL_TRUECOLOR)
 978                 return -EINVAL;
 979
 980         red = VML_TOHW(red, info->var.red.length);
 981         blue = VML_TOHW(blue, info->var.blue.length);
 982         green = VML_TOHW(green, info->var.green.length);
 983         transp = VML_TOHW(transp, info->var.transp.length);
 984
 985         v = (red << info->var.red.offset) |
 986             (green << info->var.green.offset) |
 987             (blue << info->var.blue.offset) |
 988             (transp << info->var.transp.offset);
 989
 990         switch (info->var.bits_per_pixel) {
 991         case 16:
 992                 ((u32 *) info->pseudo_palette)[regno] = v;
 993                 break;
 994         case 24:
 995         case 32:
 996                 ((u32 *) info->pseudo_palette)[regno] = v;
 997                 break;
 998         }
 999         return 0;
1000 }
1001
1002 static int vmlfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
1003 {
1004         struct vml_info *vinfo = container_of(info, struct vml_info, info);
1005         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
1006         int ret;
1007
1008         ret = vmlfb_vram_offset(vinfo, offset);
1009         if (ret)
1010                 return -EINVAL;
1011
1012         pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
1013         pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
1014
1015         return vm_iomap_memory(vma, vinfo->vram_start,
1016                         vinfo->vram_contig_size);
1017 }
1018
1019 static int vmlfb_sync(struct fb_info *info)
1020 {
1021         return 0;
1022 }
1023
1024 static int vmlfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
1025 {
1026         return -EINVAL; /* just to force soft_cursor() call */
1027 }
1028
1029 static struct fb_ops vmlfb_ops = {
1030         .owner = THIS_MODULE,
1031         .fb_open = vmlfb_open,
1032         .fb_release = vmlfb_release,
1033         .fb_check_var = vmlfb_check_var,
1034         .fb_set_par = vmlfb_set_par,
1035         .fb_blank = vmlfb_blank,
1036         .fb_pan_display = vmlfb_pan_display,
1037         .fb_fillrect = cfb_fillrect,
1038         .fb_copyarea = cfb_copyarea,
1039         .fb_imageblit = cfb_imageblit,
1040         .fb_cursor = vmlfb_cursor,
1041         .fb_sync = vmlfb_sync,
1042         .fb_mmap = vmlfb_mmap,
1043         .fb_setcolreg = vmlfb_setcolreg
1044 };
1045
1046 static struct pci_device_id vml_ids[] = {
1047         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, VML_DEVICE_VDC)},
1048         {0}
1049 };
1050
1051 static struct pci_driver vmlfb_pci_driver = {
1052         .name = "vmlfb",
1053         .id_table = vml_ids,
1054         .probe = vml_pci_probe,
1055         .remove = vml_pci_remove,
1056 };
1057
1058 static void __exit vmlfb_cleanup(void)
1059 {
1060         pci_unregister_driver(&vmlfb_pci_driver);
1061 }
1062
1063 static int __init vmlfb_init(void)
1064 {
1065
1066 #ifndef MODULE
1067         char *option = NULL;
1068
1069         if (fb_get_options(MODULE_NAME, &option))
1070                 return -ENODEV;
1071 #endif
1072
1073         printk(KERN_DEBUG MODULE_NAME ": initializing\n");
1074         mutex_init(&vml_mutex);
1075         INIT_LIST_HEAD(&global_no_mode);
1076         INIT_LIST_HEAD(&global_has_mode);
1077
1078         return pci_register_driver(&vmlfb_pci_driver);
1079 }
1080
1081 int vmlfb_register_subsys(struct vml_sys *sys)
1082 {
1083         struct vml_info *entry;
1084         struct list_head *list;
1085         u32 save_activate;
1086
1087         mutex_lock(&vml_mutex);
1088         if (subsys != NULL) {
1089                 subsys->restore(subsys);
1090         }
1091         subsys = sys;
1092         subsys->save(subsys);
1093
1094         /*
1095          * We need to restart list traversal for each item, since we
1096          * release the list mutex in the loop.
1097          */
1098
1099         list = global_no_mode.next;
1100         while (list != &global_no_mode) {
1101                 list_del_init(list);
1102                 entry = list_entry(list, struct vml_info, head);
1103
1104                 /*
1105                  * First, try the current mode which might not be
1106                  * completely validated with respect to the pixel clock.
1107                  */
1108
1109                 if (!vmlfb_check_var_locked(&entry->info.var, entry)) {
1110                         vmlfb_set_par_locked(entry);
1111                         list_add_tail(list, &global_has_mode);
1112                 } else {
1113
1114                         /*
1115                          * Didn't work. Try to find another mode,
1116                          * that matches this subsys.
1117                          */
1118
1119                         mutex_unlock(&vml_mutex);
1120                         save_activate = entry->info.var.activate;
1121                         entry->info.var.bits_per_pixel = 16;
1122                         vmlfb_set_pref_pixel_format(&entry->info.var);
1123                         if (fb_find_mode(&entry->info.var,
1124                                          &entry->info,
1125                                          vml_default_mode, NULL, 0, NULL, 16)) {
1126                                 entry->info.var.activate |=
1127                                     FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
1128                                 fb_set_var(&entry->info, &entry->info.var);
1129                         } else {
1130                                 printk(KERN_ERR MODULE_NAME
1131                                        ": Sorry. no mode found for this subsys.\n");
1132                         }
1133                         entry->info.var.activate = save_activate;
1134                         mutex_lock(&vml_mutex);
1135                 }
1136                 vmlfb_blank_locked(entry);
1137                 list = global_no_mode.next;
1138         }
1139         mutex_unlock(&vml_mutex);
1140
1141         printk(KERN_DEBUG MODULE_NAME ": Registered %s subsystem.\n",
1142                                 subsys->name ? subsys->name : "unknown");
1143         return 0;
1144 }
1145
1146 EXPORT_SYMBOL_GPL(vmlfb_register_subsys);
1147
1148 void vmlfb_unregister_subsys(struct vml_sys *sys)
1149 {
1150         struct vml_info *entry, *next;
1151
1152         mutex_lock(&vml_mutex);
1153         if (subsys != sys) {
1154                 mutex_unlock(&vml_mutex);
1155                 return;
1156         }
1157         subsys->restore(subsys);
1158         subsys = NULL;
1159         list_for_each_entry_safe(entry, next, &global_has_mode, head) {
1160                 printk(KERN_DEBUG MODULE_NAME ": subsys disable pipe\n");
1161                 vmlfb_disable_pipe(entry);
1162                 list_move_tail(&entry->head, &global_no_mode);
1163         }
1164         mutex_unlock(&vml_mutex);
1165 }
1166
1167 EXPORT_SYMBOL_GPL(vmlfb_unregister_subsys);
1168
1169 module_init(vmlfb_init);
1170 module_exit(vmlfb_cleanup);
1171
1172 MODULE_AUTHOR("Tungsten Graphics");
1173 MODULE_DESCRIPTION("Initialization of the Vermilion display devices");
1174 MODULE_VERSION("1.0.0");
1175 MODULE_LICENSE("GPL");