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