drivers/gpu/drm/cirrus/cirrus_mode.c

   1
   2 /*
   3  * Copyright 2012 Red Hat
   4  *
   5  * This file is subject to the terms and conditions of the GNU General
   6  * Public License version 2. See the file COPYING in the main
   7  * directory of this archive for more details.
   8  *
   9  * Authors: Matthew Garrett
  10  *          Dave Airlie
  11  *
  12  * Portions of this code derived from cirrusfb.c:
  13  * drivers/video/cirrusfb.c - driver for Cirrus Logic chipsets
  14  *
  15  * Copyright 1999-2001 Jeff Garzik <jgarzik@pobox.com>
  16  */
  17 #include <drm/drmP.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_plane_helper.h>
  20
  21 #include <video/cirrus.h>
  22
  23 #include "cirrus_drv.h"
  24
  25 #define CIRRUS_LUT_SIZE 256
  26
  27 #define PALETTE_INDEX 0x8
  28 #define PALETTE_DATA 0x9
  29
  30 /*
  31  * This file contains setup code for the CRTC.
  32  */
  33
  34 static void cirrus_crtc_load_lut(struct drm_crtc *crtc)
  35 {
  36         struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
  37         struct drm_device *dev = crtc->dev;
  38         struct cirrus_device *cdev = dev->dev_private;
  39         int i;
  40
  41         if (!crtc->enabled)
  42                 return;
  43
  44         for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
  45                 /* VGA registers */
  46                 WREG8(PALETTE_INDEX, i);
  47                 WREG8(PALETTE_DATA, cirrus_crtc->lut_r[i]);
  48                 WREG8(PALETTE_DATA, cirrus_crtc->lut_g[i]);
  49                 WREG8(PALETTE_DATA, cirrus_crtc->lut_b[i]);
  50         }
  51 }
  52
  53 /*
  54  * The DRM core requires DPMS functions, but they make little sense in our
  55  * case and so are just stubs
  56  */
  57
  58 static void cirrus_crtc_dpms(struct drm_crtc *crtc, int mode)
  59 {
  60         struct drm_device *dev = crtc->dev;
  61         struct cirrus_device *cdev = dev->dev_private;
  62         u8 sr01, gr0e;
  63
  64         switch (mode) {
  65         case DRM_MODE_DPMS_ON:
  66                 sr01 = 0x00;
  67                 gr0e = 0x00;
  68                 break;
  69         case DRM_MODE_DPMS_STANDBY:
  70                 sr01 = 0x20;
  71                 gr0e = 0x02;
  72                 break;
  73         case DRM_MODE_DPMS_SUSPEND:
  74                 sr01 = 0x20;
  75                 gr0e = 0x04;
  76                 break;
  77         case DRM_MODE_DPMS_OFF:
  78                 sr01 = 0x20;
  79                 gr0e = 0x06;
  80                 break;
  81         default:
  82                 return;
  83         }
  84
  85         WREG8(SEQ_INDEX, 0x1);
  86         sr01 |= RREG8(SEQ_DATA) & ~0x20;
  87         WREG_SEQ(0x1, sr01);
  88
  89         WREG8(GFX_INDEX, 0xe);
  90         gr0e |= RREG8(GFX_DATA) & ~0x06;
  91         WREG_GFX(0xe, gr0e);
  92 }
  93
  94 /*
  95  * The core passes the desired mode to the CRTC code to see whether any
  96  * CRTC-specific modifications need to be made to it. We're in a position
  97  * to just pass that straight through, so this does nothing
  98  */
  99 static bool cirrus_crtc_mode_fixup(struct drm_crtc *crtc,
 100                                    const struct drm_display_mode *mode,
 101                                    struct drm_display_mode *adjusted_mode)
 102 {
 103         return true;
 104 }
 105
 106 static void cirrus_set_start_address(struct drm_crtc *crtc, unsigned offset)
 107 {
 108         struct cirrus_device *cdev = crtc->dev->dev_private;
 109         u32 addr;
 110         u8 tmp;
 111
 112         addr = offset >> 2;
 113         WREG_CRT(0x0c, (u8)((addr >> 8) & 0xff));
 114         WREG_CRT(0x0d, (u8)(addr & 0xff));
 115
 116         WREG8(CRT_INDEX, 0x1b);
 117         tmp = RREG8(CRT_DATA);
 118         tmp &= 0xf2;
 119         tmp |= (addr >> 16) & 0x01;
 120         tmp |= (addr >> 15) & 0x0c;
 121         WREG_CRT(0x1b, tmp);
 122         WREG8(CRT_INDEX, 0x1d);
 123         tmp = RREG8(CRT_DATA);
 124         tmp &= 0x7f;
 125         tmp |= (addr >> 12) & 0x80;
 126         WREG_CRT(0x1d, tmp);
 127 }
 128
 129 /* cirrus is different - we will force move buffers out of VRAM */
 130 static int cirrus_crtc_do_set_base(struct drm_crtc *crtc,
 131                                 struct drm_framebuffer *fb,
 132                                 int x, int y, int atomic)
 133 {
 134         struct cirrus_device *cdev = crtc->dev->dev_private;
 135         struct drm_gem_object *obj;
 136         struct cirrus_framebuffer *cirrus_fb;
 137         struct cirrus_bo *bo;
 138         int ret;
 139         u64 gpu_addr;
 140
 141         /* push the previous fb to system ram */
 142         if (!atomic && fb) {
 143                 cirrus_fb = to_cirrus_framebuffer(fb);
 144                 obj = cirrus_fb->obj;
 145                 bo = gem_to_cirrus_bo(obj);
 146                 ret = cirrus_bo_reserve(bo, false);
 147                 if (ret)
 148                         return ret;
 149                 cirrus_bo_push_sysram(bo);
 150                 cirrus_bo_unreserve(bo);
 151         }
 152
 153         cirrus_fb = to_cirrus_framebuffer(crtc->primary->fb);
 154         obj = cirrus_fb->obj;
 155         bo = gem_to_cirrus_bo(obj);
 156
 157         ret = cirrus_bo_reserve(bo, false);
 158         if (ret)
 159                 return ret;
 160
 161         ret = cirrus_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
 162         if (ret) {
 163                 cirrus_bo_unreserve(bo);
 164                 return ret;
 165         }
 166
 167         if (&cdev->mode_info.gfbdev->gfb == cirrus_fb) {
 168                 /* if pushing console in kmap it */
 169                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 170                 if (ret)
 171                         DRM_ERROR("failed to kmap fbcon\n");
 172         }
 173         cirrus_bo_unreserve(bo);
 174
 175         cirrus_set_start_address(crtc, (u32)gpu_addr);
 176         return 0;
 177 }
 178
 179 static int cirrus_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
 180                              struct drm_framebuffer *old_fb)
 181 {
 182         return cirrus_crtc_do_set_base(crtc, old_fb, x, y, 0);
 183 }
 184
 185 /*
 186  * The meat of this driver. The core passes us a mode and we have to program
 187  * it. The modesetting here is the bare minimum required to satisfy the qemu
 188  * emulation of this hardware, and running this against a real device is
 189  * likely to result in an inadequately programmed mode. We've already had
 190  * the opportunity to modify the mode, so whatever we receive here should
 191  * be something that can be correctly programmed and displayed
 192  */
 193 static int cirrus_crtc_mode_set(struct drm_crtc *crtc,
 194                                 struct drm_display_mode *mode,
 195                                 struct drm_display_mode *adjusted_mode,
 196                                 int x, int y, struct drm_framebuffer *old_fb)
 197 {
 198         struct drm_device *dev = crtc->dev;
 199         struct cirrus_device *cdev = dev->dev_private;
 200         int hsyncstart, hsyncend, htotal, hdispend;
 201         int vtotal, vdispend;
 202         int tmp;
 203         int sr07 = 0, hdr = 0;
 204
 205         htotal = mode->htotal / 8;
 206         hsyncend = mode->hsync_end / 8;
 207         hsyncstart = mode->hsync_start / 8;
 208         hdispend = mode->hdisplay / 8;
 209
 210         vtotal = mode->vtotal;
 211         vdispend = mode->vdisplay;
 212
 213         vdispend -= 1;
 214         vtotal -= 2;
 215
 216         htotal -= 5;
 217         hdispend -= 1;
 218         hsyncstart += 1;
 219         hsyncend += 1;
 220
 221         WREG_CRT(VGA_CRTC_V_SYNC_END, 0x20);
 222         WREG_CRT(VGA_CRTC_H_TOTAL, htotal);
 223         WREG_CRT(VGA_CRTC_H_DISP, hdispend);
 224         WREG_CRT(VGA_CRTC_H_SYNC_START, hsyncstart);
 225         WREG_CRT(VGA_CRTC_H_SYNC_END, hsyncend);
 226         WREG_CRT(VGA_CRTC_V_TOTAL, vtotal & 0xff);
 227         WREG_CRT(VGA_CRTC_V_DISP_END, vdispend & 0xff);
 228
 229         tmp = 0x40;
 230         if ((vdispend + 1) & 512)
 231                 tmp |= 0x20;
 232         WREG_CRT(VGA_CRTC_MAX_SCAN, tmp);
 233
 234         /*
 235          * Overflow bits for values that don't fit in the standard registers
 236          */
 237         tmp = 16;
 238         if (vtotal & 256)
 239                 tmp |= 1;
 240         if (vdispend & 256)
 241                 tmp |= 2;
 242         if ((vdispend + 1) & 256)
 243                 tmp |= 8;
 244         if (vtotal & 512)
 245                 tmp |= 32;
 246         if (vdispend & 512)
 247                 tmp |= 64;
 248         WREG_CRT(VGA_CRTC_OVERFLOW, tmp);
 249
 250         tmp = 0;
 251
 252         /* More overflow bits */
 253
 254         if ((htotal + 5) & 64)
 255                 tmp |= 16;
 256         if ((htotal + 5) & 128)
 257                 tmp |= 32;
 258         if (vtotal & 256)
 259                 tmp |= 64;
 260         if (vtotal & 512)
 261                 tmp |= 128;
 262
 263         WREG_CRT(CL_CRT1A, tmp);
 264
 265         /* Disable Hercules/CGA compatibility */
 266         WREG_CRT(VGA_CRTC_MODE, 0x03);
 267
 268         WREG8(SEQ_INDEX, 0x7);
 269         sr07 = RREG8(SEQ_DATA);
 270         sr07 &= 0xe0;
 271         hdr = 0;
 272         switch (crtc->primary->fb->bits_per_pixel) {
 273         case 8:
 274                 sr07 |= 0x11;
 275                 break;
 276         case 16:
 277                 sr07 |= 0x17;
 278                 hdr = 0xc1;
 279                 break;
 280         case 24:
 281                 sr07 |= 0x15;
 282                 hdr = 0xc5;
 283                 break;
 284         case 32:
 285                 sr07 |= 0x19;
 286                 hdr = 0xc5;
 287                 break;
 288         default:
 289                 return -1;
 290         }
 291
 292         WREG_SEQ(0x7, sr07);
 293
 294         /* Program the pitch */
 295         tmp = crtc->primary->fb->pitches[0] / 8;
 296         WREG_CRT(VGA_CRTC_OFFSET, tmp);
 297
 298         /* Enable extended blanking and pitch bits, and enable full memory */
 299         tmp = 0x22;
 300         tmp |= (crtc->primary->fb->pitches[0] >> 7) & 0x10;
 301         tmp |= (crtc->primary->fb->pitches[0] >> 6) & 0x40;
 302         WREG_CRT(0x1b, tmp);
 303
 304         /* Enable high-colour modes */
 305         WREG_GFX(VGA_GFX_MODE, 0x40);
 306
 307         /* And set graphics mode */
 308         WREG_GFX(VGA_GFX_MISC, 0x01);
 309
 310         WREG_HDR(hdr);
 311         cirrus_crtc_do_set_base(crtc, old_fb, x, y, 0);
 312
 313         /* Unblank (needed on S3 resume, vgabios doesn't do it then) */
 314         outb(0x20, 0x3c0);
 315         return 0;
 316 }
 317
 318 /*
 319  * This is called before a mode is programmed. A typical use might be to
 320  * enable DPMS during the programming to avoid seeing intermediate stages,
 321  * but that's not relevant to us
 322  */
 323 static void cirrus_crtc_prepare(struct drm_crtc *crtc)
 324 {
 325 }
 326
 327 /*
 328  * This is called after a mode is programmed. It should reverse anything done
 329  * by the prepare function
 330  */
 331 static void cirrus_crtc_commit(struct drm_crtc *crtc)
 332 {
 333 }
 334
 335 /*
 336  * The core can pass us a set of gamma values to program. We actually only
 337  * use this for 8-bit mode so can't perform smooth fades on deeper modes,
 338  * but it's a requirement that we provide the function
 339  */
 340 static void cirrus_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
 341                                   u16 *blue, uint32_t start, uint32_t size)
 342 {
 343         struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
 344         int i;
 345
 346         if (size != CIRRUS_LUT_SIZE)
 347                 return;
 348
 349         for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
 350                 cirrus_crtc->lut_r[i] = red[i];
 351                 cirrus_crtc->lut_g[i] = green[i];
 352                 cirrus_crtc->lut_b[i] = blue[i];
 353         }
 354         cirrus_crtc_load_lut(crtc);
 355 }
 356
 357 /* Simple cleanup function */
 358 static void cirrus_crtc_destroy(struct drm_crtc *crtc)
 359 {
 360         struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
 361
 362         drm_crtc_cleanup(crtc);
 363         kfree(cirrus_crtc);
 364 }
 365
 366 /* These provide the minimum set of functions required to handle a CRTC */
 367 static const struct drm_crtc_funcs cirrus_crtc_funcs = {
 368         .gamma_set = cirrus_crtc_gamma_set,
 369         .set_config = drm_crtc_helper_set_config,
 370         .destroy = cirrus_crtc_destroy,
 371 };
 372
 373 static const struct drm_crtc_helper_funcs cirrus_helper_funcs = {
 374         .dpms = cirrus_crtc_dpms,
 375         .mode_fixup = cirrus_crtc_mode_fixup,
 376         .mode_set = cirrus_crtc_mode_set,
 377         .mode_set_base = cirrus_crtc_mode_set_base,
 378         .prepare = cirrus_crtc_prepare,
 379         .commit = cirrus_crtc_commit,
 380         .load_lut = cirrus_crtc_load_lut,
 381 };
 382
 383 /* CRTC setup */
 384 static void cirrus_crtc_init(struct drm_device *dev)
 385 {
 386         struct cirrus_device *cdev = dev->dev_private;
 387         struct cirrus_crtc *cirrus_crtc;
 388         int i;
 389
 390         cirrus_crtc = kzalloc(sizeof(struct cirrus_crtc) +
 391                               (CIRRUSFB_CONN_LIMIT * sizeof(struct drm_connector *)),
 392                               GFP_KERNEL);
 393
 394         if (cirrus_crtc == NULL)
 395                 return;
 396
 397         drm_crtc_init(dev, &cirrus_crtc->base, &cirrus_crtc_funcs);
 398
 399         drm_mode_crtc_set_gamma_size(&cirrus_crtc->base, CIRRUS_LUT_SIZE);
 400         cdev->mode_info.crtc = cirrus_crtc;
 401
 402         for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
 403                 cirrus_crtc->lut_r[i] = i;
 404                 cirrus_crtc->lut_g[i] = i;
 405                 cirrus_crtc->lut_b[i] = i;
 406         }
 407
 408         drm_crtc_helper_add(&cirrus_crtc->base, &cirrus_helper_funcs);
 409 }
 410
 411 /** Sets the color ramps on behalf of fbcon */
 412 void cirrus_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 413                               u16 blue, int regno)
 414 {
 415         struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
 416
 417         cirrus_crtc->lut_r[regno] = red;
 418         cirrus_crtc->lut_g[regno] = green;
 419         cirrus_crtc->lut_b[regno] = blue;
 420 }
 421
 422 /** Gets the color ramps on behalf of fbcon */
 423 void cirrus_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 424                               u16 *blue, int regno)
 425 {
 426         struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
 427
 428         *red = cirrus_crtc->lut_r[regno];
 429         *green = cirrus_crtc->lut_g[regno];
 430         *blue = cirrus_crtc->lut_b[regno];
 431 }
 432
 433
 434 static bool cirrus_encoder_mode_fixup(struct drm_encoder *encoder,
 435                                       const struct drm_display_mode *mode,
 436                                       struct drm_display_mode *adjusted_mode)
 437 {
 438         return true;
 439 }
 440
 441 static void cirrus_encoder_mode_set(struct drm_encoder *encoder,
 442                                 struct drm_display_mode *mode,
 443                                 struct drm_display_mode *adjusted_mode)
 444 {
 445 }
 446
 447 static void cirrus_encoder_dpms(struct drm_encoder *encoder, int state)
 448 {
 449         return;
 450 }
 451
 452 static void cirrus_encoder_prepare(struct drm_encoder *encoder)
 453 {
 454 }
 455
 456 static void cirrus_encoder_commit(struct drm_encoder *encoder)
 457 {
 458 }
 459
 460 static void cirrus_encoder_destroy(struct drm_encoder *encoder)
 461 {
 462         struct cirrus_encoder *cirrus_encoder = to_cirrus_encoder(encoder);
 463         drm_encoder_cleanup(encoder);
 464         kfree(cirrus_encoder);
 465 }
 466
 467 static const struct drm_encoder_helper_funcs cirrus_encoder_helper_funcs = {
 468         .dpms = cirrus_encoder_dpms,
 469         .mode_fixup = cirrus_encoder_mode_fixup,
 470         .mode_set = cirrus_encoder_mode_set,
 471         .prepare = cirrus_encoder_prepare,
 472         .commit = cirrus_encoder_commit,
 473 };
 474
 475 static const struct drm_encoder_funcs cirrus_encoder_encoder_funcs = {
 476         .destroy = cirrus_encoder_destroy,
 477 };
 478
 479 static struct drm_encoder *cirrus_encoder_init(struct drm_device *dev)
 480 {
 481         struct drm_encoder *encoder;
 482         struct cirrus_encoder *cirrus_encoder;
 483
 484         cirrus_encoder = kzalloc(sizeof(struct cirrus_encoder), GFP_KERNEL);
 485         if (!cirrus_encoder)
 486                 return NULL;
 487
 488         encoder = &cirrus_encoder->base;
 489         encoder->possible_crtcs = 0x1;
 490
 491         drm_encoder_init(dev, encoder, &cirrus_encoder_encoder_funcs,
 492                          DRM_MODE_ENCODER_DAC, NULL);
 493         drm_encoder_helper_add(encoder, &cirrus_encoder_helper_funcs);
 494
 495         return encoder;
 496 }
 497
 498
 499 static int cirrus_vga_get_modes(struct drm_connector *connector)
 500 {
 501         int count;
 502
 503         /* Just add a static list of modes */
 504         if (cirrus_bpp <= 24) {
 505                 count = drm_add_modes_noedid(connector, 1280, 1024);
 506                 drm_set_preferred_mode(connector, 1024, 768);
 507         } else {
 508                 count = drm_add_modes_noedid(connector, 800, 600);
 509                 drm_set_preferred_mode(connector, 800, 600);
 510         }
 511         return count;
 512 }
 513
 514 static struct drm_encoder *cirrus_connector_best_encoder(struct drm_connector
 515                                                   *connector)
 516 {
 517         int enc_id = connector->encoder_ids[0];
 518         /* pick the encoder ids */
 519         if (enc_id)
 520                 return drm_encoder_find(connector->dev, enc_id);
 521         return NULL;
 522 }
 523
 524 static enum drm_connector_status cirrus_vga_detect(struct drm_connector
 525                                                    *connector, bool force)
 526 {
 527         return connector_status_connected;
 528 }
 529
 530 static void cirrus_connector_destroy(struct drm_connector *connector)
 531 {
 532         drm_connector_cleanup(connector);
 533         kfree(connector);
 534 }
 535
 536 struct drm_connector_helper_funcs cirrus_vga_connector_helper_funcs = {
 537         .get_modes = cirrus_vga_get_modes,
 538         .best_encoder = cirrus_connector_best_encoder,
 539 };
 540
 541 struct drm_connector_funcs cirrus_vga_connector_funcs = {
 542         .dpms = drm_helper_connector_dpms,
 543         .detect = cirrus_vga_detect,
 544         .fill_modes = drm_helper_probe_single_connector_modes,
 545         .destroy = cirrus_connector_destroy,
 546 };
 547
 548 static struct drm_connector *cirrus_vga_init(struct drm_device *dev)
 549 {
 550         struct drm_connector *connector;
 551         struct cirrus_connector *cirrus_connector;
 552
 553         cirrus_connector = kzalloc(sizeof(struct cirrus_connector), GFP_KERNEL);
 554         if (!cirrus_connector)
 555                 return NULL;
 556
 557         connector = &cirrus_connector->base;
 558
 559         drm_connector_init(dev, connector,
 560                            &cirrus_vga_connector_funcs, DRM_MODE_CONNECTOR_VGA);
 561
 562         drm_connector_helper_add(connector, &cirrus_vga_connector_helper_funcs);
 563
 564         drm_connector_register(connector);
 565         return connector;
 566 }
 567
 568
 569 int cirrus_modeset_init(struct cirrus_device *cdev)
 570 {
 571         struct drm_encoder *encoder;
 572         struct drm_connector *connector;
 573         int ret;
 574
 575         drm_mode_config_init(cdev->dev);
 576         cdev->mode_info.mode_config_initialized = true;
 577
 578         cdev->dev->mode_config.max_width = CIRRUS_MAX_FB_WIDTH;
 579         cdev->dev->mode_config.max_height = CIRRUS_MAX_FB_HEIGHT;
 580
 581         cdev->dev->mode_config.fb_base = cdev->mc.vram_base;
 582         cdev->dev->mode_config.preferred_depth = 24;
 583         /* don't prefer a shadow on virt GPU */
 584         cdev->dev->mode_config.prefer_shadow = 0;
 585
 586         cirrus_crtc_init(cdev->dev);
 587
 588         encoder = cirrus_encoder_init(cdev->dev);
 589         if (!encoder) {
 590                 DRM_ERROR("cirrus_encoder_init failed\n");
 591                 return -1;
 592         }
 593
 594         connector = cirrus_vga_init(cdev->dev);
 595         if (!connector) {
 596                 DRM_ERROR("cirrus_vga_init failed\n");
 597                 return -1;
 598         }
 599
 600         drm_mode_connector_attach_encoder(connector, encoder);
 601
 602         ret = cirrus_fbdev_init(cdev);
 603         if (ret) {
 604                 DRM_ERROR("cirrus_fbdev_init failed\n");
 605                 return ret;
 606         }
 607
 608         return 0;
 609 }
 610
 611 void cirrus_modeset_fini(struct cirrus_device *cdev)
 612 {
 613         cirrus_fbdev_fini(cdev);
 614
 615         if (cdev->mode_info.mode_config_initialized) {
 616                 drm_mode_config_cleanup(cdev->dev);
 617                 cdev->mode_info.mode_config_initialized = false;
 618         }
 619 }