drivers/gpu/drm/gma500/intel_bios.c

   1 /*
   2  * Copyright (c) 2006 Intel Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Authors:
  18  *    Eric Anholt <eric@anholt.net>
  19  *
  20  */
  21 #include <drm/drmP.h>
  22 #include <drm/drm.h>
  23 #include "gma_drm.h"
  24 #include "psb_drv.h"
  25 #include "psb_intel_drv.h"
  26 #include "psb_intel_reg.h"
  27 #include "intel_bios.h"
  28
  29 #define SLAVE_ADDR1     0x70
  30 #define SLAVE_ADDR2     0x72
  31
  32 static void *find_section(struct bdb_header *bdb, int section_id)
  33 {
  34         u8 *base = (u8 *)bdb;
  35         int index = 0;
  36         u16 total, current_size;
  37         u8 current_id;
  38
  39         /* skip to first section */
  40         index += bdb->header_size;
  41         total = bdb->bdb_size;
  42
  43         /* walk the sections looking for section_id */
  44         while (index < total) {
  45                 current_id = *(base + index);
  46                 index++;
  47                 current_size = *((u16 *)(base + index));
  48                 index += 2;
  49                 if (current_id == section_id)
  50                         return base + index;
  51                 index += current_size;
  52         }
  53
  54         return NULL;
  55 }
  56
  57 static u16
  58 get_blocksize(void *p)
  59 {
  60         u16 *block_ptr, block_size;
  61
  62         block_ptr = (u16 *)((char *)p - 2);
  63         block_size = *block_ptr;
  64         return block_size;
  65 }
  66
  67 static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  68                         struct lvds_dvo_timing *dvo_timing)
  69 {
  70         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  71                 dvo_timing->hactive_lo;
  72         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  73                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  74         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  75                 dvo_timing->hsync_pulse_width;
  76         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  77                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  78
  79         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  80                 dvo_timing->vactive_lo;
  81         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  82                 dvo_timing->vsync_off;
  83         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  84                 dvo_timing->vsync_pulse_width;
  85         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  86                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  87         panel_fixed_mode->clock = dvo_timing->clock * 10;
  88         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  89
  90         if (dvo_timing->hsync_positive)
  91                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PHSYNC;
  92         else
  93                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NHSYNC;
  94
  95         if (dvo_timing->vsync_positive)
  96                 panel_fixed_mode->flags |= DRM_MODE_FLAG_PVSYNC;
  97         else
  98                 panel_fixed_mode->flags |= DRM_MODE_FLAG_NVSYNC;
  99
 100         /* Some VBTs have bogus h/vtotal values */
 101         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
 102                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
 103         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
 104                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
 105
 106         drm_mode_set_name(panel_fixed_mode);
 107 }
 108
 109 static void parse_backlight_data(struct drm_psb_private *dev_priv,
 110                                 struct bdb_header *bdb)
 111 {
 112         struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
 113         struct bdb_lvds_backlight *lvds_bl;
 114         u8 p_type = 0;
 115         void *bl_start = NULL;
 116         struct bdb_lvds_options *lvds_opts
 117                                 = find_section(bdb, BDB_LVDS_OPTIONS);
 118
 119         dev_priv->lvds_bl = NULL;
 120
 121         if (lvds_opts)
 122                 p_type = lvds_opts->panel_type;
 123         else
 124                 return;
 125
 126         bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
 127         vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
 128
 129         lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
 130         if (!lvds_bl) {
 131                 dev_err(dev_priv->dev->dev, "out of memory for backlight data\n");
 132                 return;
 133         }
 134         memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
 135         dev_priv->lvds_bl = lvds_bl;
 136 }
 137
 138 /* Try to find integrated panel data */
 139 static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
 140                             struct bdb_header *bdb)
 141 {
 142         struct bdb_lvds_options *lvds_options;
 143         struct bdb_lvds_lfp_data *lvds_lfp_data;
 144         struct bdb_lvds_lfp_data_entry *entry;
 145         struct lvds_dvo_timing *dvo_timing;
 146         struct drm_display_mode *panel_fixed_mode;
 147
 148         /* Defaults if we can't find VBT info */
 149         dev_priv->lvds_dither = 0;
 150         dev_priv->lvds_vbt = 0;
 151
 152         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 153         if (!lvds_options)
 154                 return;
 155
 156         dev_priv->lvds_dither = lvds_options->pixel_dither;
 157         if (lvds_options->panel_type == 0xff)
 158                 return;
 159
 160         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 161         if (!lvds_lfp_data)
 162                 return;
 163
 164
 165         entry = &lvds_lfp_data->data[lvds_options->panel_type];
 166         dvo_timing = &entry->dvo_timing;
 167
 168         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
 169                                       GFP_KERNEL);
 170         if (panel_fixed_mode == NULL) {
 171                 dev_err(dev_priv->dev->dev, "out of memory for fixed panel mode\n");
 172                 return;
 173         }
 174
 175         dev_priv->lvds_vbt = 1;
 176         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 177
 178         if (panel_fixed_mode->htotal > 0 && panel_fixed_mode->vtotal > 0) {
 179                 dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 180                 drm_mode_debug_printmodeline(panel_fixed_mode);
 181         } else {
 182                 dev_dbg(dev_priv->dev->dev, "ignoring invalid LVDS VBT\n");
 183                 dev_priv->lvds_vbt = 0;
 184                 kfree(panel_fixed_mode);
 185         }
 186         return;
 187 }
 188
 189 /* Try to find sdvo panel data */
 190 static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
 191                       struct bdb_header *bdb)
 192 {
 193         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 194         struct lvds_dvo_timing *dvo_timing;
 195         struct drm_display_mode *panel_fixed_mode;
 196
 197         dev_priv->sdvo_lvds_vbt_mode = NULL;
 198
 199         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 200         if (!sdvo_lvds_options)
 201                 return;
 202
 203         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 204         if (!dvo_timing)
 205                 return;
 206
 207         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 208
 209         if (!panel_fixed_mode)
 210                 return;
 211
 212         fill_detail_timing_data(panel_fixed_mode,
 213                         dvo_timing + sdvo_lvds_options->panel_type);
 214
 215         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 216
 217         return;
 218 }
 219
 220 static void parse_general_features(struct drm_psb_private *dev_priv,
 221                        struct bdb_header *bdb)
 222 {
 223         struct bdb_general_features *general;
 224
 225         /* Set sensible defaults in case we can't find the general block */
 226         dev_priv->int_tv_support = 1;
 227         dev_priv->int_crt_support = 1;
 228
 229         general = find_section(bdb, BDB_GENERAL_FEATURES);
 230         if (general) {
 231                 dev_priv->int_tv_support = general->int_tv_support;
 232                 dev_priv->int_crt_support = general->int_crt_support;
 233                 dev_priv->lvds_use_ssc = general->enable_ssc;
 234
 235                 if (dev_priv->lvds_use_ssc) {
 236                         dev_priv->lvds_ssc_freq
 237                                 = general->ssc_freq ? 100 : 96;
 238                 }
 239         }
 240 }
 241
 242 static void
 243 parse_sdvo_device_mapping(struct drm_psb_private *dev_priv,
 244                           struct bdb_header *bdb)
 245 {
 246         struct sdvo_device_mapping *p_mapping;
 247         struct bdb_general_definitions *p_defs;
 248         struct child_device_config *p_child;
 249         int i, child_device_num, count;
 250         u16     block_size;
 251
 252         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 253         if (!p_defs) {
 254                 DRM_DEBUG_KMS("No general definition block is found, unable to construct sdvo mapping.\n");
 255                 return;
 256         }
 257         /* judge whether the size of child device meets the requirements.
 258          * If the child device size obtained from general definition block
 259          * is different with sizeof(struct child_device_config), skip the
 260          * parsing of sdvo device info
 261          */
 262         if (p_defs->child_dev_size != sizeof(*p_child)) {
 263                 /* different child dev size . Ignore it */
 264                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 265                 return;
 266         }
 267         /* get the block size of general definitions */
 268         block_size = get_blocksize(p_defs);
 269         /* get the number of child device */
 270         child_device_num = (block_size - sizeof(*p_defs)) /
 271                                 sizeof(*p_child);
 272         count = 0;
 273         for (i = 0; i < child_device_num; i++) {
 274                 p_child = &(p_defs->devices[i]);
 275                 if (!p_child->device_type) {
 276                         /* skip the device block if device type is invalid */
 277                         continue;
 278                 }
 279                 if (p_child->slave_addr != SLAVE_ADDR1 &&
 280                         p_child->slave_addr != SLAVE_ADDR2) {
 281                         /*
 282                          * If the slave address is neither 0x70 nor 0x72,
 283                          * it is not a SDVO device. Skip it.
 284                          */
 285                         continue;
 286                 }
 287                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
 288                         p_child->dvo_port != DEVICE_PORT_DVOC) {
 289                         /* skip the incorrect SDVO port */
 290                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it\n");
 291                         continue;
 292                 }
 293                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
 294                                 " %s port\n",
 295                                 p_child->slave_addr,
 296                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
 297                                         "SDVOB" : "SDVOC");
 298                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
 299                 if (!p_mapping->initialized) {
 300                         p_mapping->dvo_port = p_child->dvo_port;
 301                         p_mapping->slave_addr = p_child->slave_addr;
 302                         p_mapping->dvo_wiring = p_child->dvo_wiring;
 303                         p_mapping->ddc_pin = p_child->ddc_pin;
 304                         p_mapping->i2c_pin = p_child->i2c_pin;
 305                         p_mapping->initialized = 1;
 306                         DRM_DEBUG_KMS("SDVO device: dvo=%x, addr=%x, wiring=%d, ddc_pin=%d, i2c_pin=%d\n",
 307                                       p_mapping->dvo_port,
 308                                       p_mapping->slave_addr,
 309                                       p_mapping->dvo_wiring,
 310                                       p_mapping->ddc_pin,
 311                                       p_mapping->i2c_pin);
 312                 } else {
 313                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
 314                                          "two SDVO device.\n");
 315                 }
 316                 if (p_child->slave2_addr) {
 317                         /* Maybe this is a SDVO device with multiple inputs */
 318                         /* And the mapping info is not added */
 319                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
 320                                 " is a SDVO device with multiple inputs.\n");
 321                 }
 322                 count++;
 323         }
 324
 325         if (!count) {
 326                 /* No SDVO device info is found */
 327                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
 328         }
 329         return;
 330 }
 331
 332
 333 static void
 334 parse_driver_features(struct drm_psb_private *dev_priv,
 335                       struct bdb_header *bdb)
 336 {
 337         struct bdb_driver_features *driver;
 338
 339         driver = find_section(bdb, BDB_DRIVER_FEATURES);
 340         if (!driver)
 341                 return;
 342
 343         /* This bit means to use 96Mhz for DPLL_A or not */
 344         if (driver->primary_lfp_id)
 345                 dev_priv->dplla_96mhz = true;
 346         else
 347                 dev_priv->dplla_96mhz = false;
 348 }
 349
 350 static void
 351 parse_device_mapping(struct drm_psb_private *dev_priv,
 352                        struct bdb_header *bdb)
 353 {
 354         struct bdb_general_definitions *p_defs;
 355         struct child_device_config *p_child, *child_dev_ptr;
 356         int i, child_device_num, count;
 357         u16     block_size;
 358
 359         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
 360         if (!p_defs) {
 361                 DRM_DEBUG_KMS("No general definition block is found, no devices defined.\n");
 362                 return;
 363         }
 364         /* judge whether the size of child device meets the requirements.
 365          * If the child device size obtained from general definition block
 366          * is different with sizeof(struct child_device_config), skip the
 367          * parsing of sdvo device info
 368          */
 369         if (p_defs->child_dev_size != sizeof(*p_child)) {
 370                 /* different child dev size . Ignore it */
 371                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
 372                 return;
 373         }
 374         /* get the block size of general definitions */
 375         block_size = get_blocksize(p_defs);
 376         /* get the number of child device */
 377         child_device_num = (block_size - sizeof(*p_defs)) /
 378                                 sizeof(*p_child);
 379         count = 0;
 380         /* get the number of child devices that are present */
 381         for (i = 0; i < child_device_num; i++) {
 382                 p_child = &(p_defs->devices[i]);
 383                 if (!p_child->device_type) {
 384                         /* skip the device block if device type is invalid */
 385                         continue;
 386                 }
 387                 count++;
 388         }
 389         if (!count) {
 390                 DRM_DEBUG_KMS("no child dev is parsed from VBT\n");
 391                 return;
 392         }
 393         dev_priv->child_dev = kcalloc(count, sizeof(*p_child), GFP_KERNEL);
 394         if (!dev_priv->child_dev) {
 395                 DRM_DEBUG_KMS("No memory space for child devices\n");
 396                 return;
 397         }
 398
 399         dev_priv->child_dev_num = count;
 400         count = 0;
 401         for (i = 0; i < child_device_num; i++) {
 402                 p_child = &(p_defs->devices[i]);
 403                 if (!p_child->device_type) {
 404                         /* skip the device block if device type is invalid */
 405                         continue;
 406                 }
 407                 child_dev_ptr = dev_priv->child_dev + count;
 408                 count++;
 409                 memcpy((void *)child_dev_ptr, (void *)p_child,
 410                                         sizeof(*p_child));
 411         }
 412         return;
 413 }
 414
 415
 416 /**
 417  * psb_intel_init_bios - initialize VBIOS settings & find VBT
 418  * @dev: DRM device
 419  *
 420  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 421  * to appropriate values.
 422  *
 423  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 424  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 425  * feed an updated VBT back through that, compared to what we'll fetch using
 426  * this method of groping around in the BIOS data.
 427  *
 428  * Returns 0 on success, nonzero on failure.
 429  */
 430 bool psb_intel_init_bios(struct drm_device *dev)
 431 {
 432         struct drm_psb_private *dev_priv = dev->dev_private;
 433         struct pci_dev *pdev = dev->pdev;
 434         struct vbt_header *vbt = NULL;
 435         struct bdb_header *bdb = NULL;
 436         u8 __iomem *bios = NULL;
 437         size_t size;
 438         int i;
 439
 440         /* XXX Should this validation be moved to intel_opregion.c? */
 441         if (dev_priv->opregion.vbt) {
 442                 struct vbt_header *vbt = dev_priv->opregion.vbt;
 443                 if (memcmp(vbt->signature, "$VBT", 4) == 0) {
 444                         DRM_DEBUG_KMS("Using VBT from OpRegion: %20s\n",
 445                                          vbt->signature);
 446                         bdb = (struct bdb_header *)((char *)vbt + vbt->bdb_offset);
 447                 } else
 448                         dev_priv->opregion.vbt = NULL;
 449         }
 450
 451         if (bdb == NULL) {
 452                 bios = pci_map_rom(pdev, &size);
 453                 if (!bios)
 454                         return -1;
 455
 456                 /* Scour memory looking for the VBT signature */
 457                 for (i = 0; i + 4 < size; i++) {
 458                         if (!memcmp(bios + i, "$VBT", 4)) {
 459                                 vbt = (struct vbt_header *)(bios + i);
 460                                 break;
 461                         }
 462                 }
 463
 464                 if (!vbt) {
 465                         dev_err(dev->dev, "VBT signature missing\n");
 466                         pci_unmap_rom(pdev, bios);
 467                         return -1;
 468                 }
 469                 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 470         }
 471
 472         /* Grab useful general dxefinitions */
 473         parse_general_features(dev_priv, bdb);
 474         parse_driver_features(dev_priv, bdb);
 475         parse_lfp_panel_data(dev_priv, bdb);
 476         parse_sdvo_panel_data(dev_priv, bdb);
 477         parse_sdvo_device_mapping(dev_priv, bdb);
 478         parse_device_mapping(dev_priv, bdb);
 479         parse_backlight_data(dev_priv, bdb);
 480
 481         if (bios)
 482                 pci_unmap_rom(pdev, bios);
 483
 484         return 0;
 485 }
 486
 487 /**
 488  * Destroy and free VBT data
 489  */
 490 void psb_intel_destroy_bios(struct drm_device *dev)
 491 {
 492         struct drm_psb_private *dev_priv = dev->dev_private;
 493
 494         kfree(dev_priv->sdvo_lvds_vbt_mode);
 495         kfree(dev_priv->lfp_lvds_vbt_mode);
 496         kfree(dev_priv->lvds_bl);
 497 }