drivers/staging/gma500/psb_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 "psb_drm.h"
  24 #include "psb_drv.h"
  25 #include "psb_intel_drv.h"
  26 #include "psb_intel_reg.h"
  27 #include "psb_intel_bios.h"
  28
  29
  30 static void *find_section(struct bdb_header *bdb, int section_id)
  31 {
  32         u8 *base = (u8 *)bdb;
  33         int index = 0;
  34         u16 total, current_size;
  35         u8 current_id;
  36
  37         /* skip to first section */
  38         index += bdb->header_size;
  39         total = bdb->bdb_size;
  40
  41         /* walk the sections looking for section_id */
  42         while (index < total) {
  43                 current_id = *(base + index);
  44                 index++;
  45                 current_size = *((u16 *)(base + index));
  46                 index += 2;
  47                 if (current_id == section_id)
  48                         return base + index;
  49                 index += current_size;
  50         }
  51
  52         return NULL;
  53 }
  54
  55 static void fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
  56                         struct lvds_dvo_timing *dvo_timing)
  57 {
  58         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
  59                 dvo_timing->hactive_lo;
  60         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
  61                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
  62         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
  63                 dvo_timing->hsync_pulse_width;
  64         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
  65                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
  66
  67         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
  68                 dvo_timing->vactive_lo;
  69         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
  70                 dvo_timing->vsync_off;
  71         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
  72                 dvo_timing->vsync_pulse_width;
  73         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
  74                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
  75         panel_fixed_mode->clock = dvo_timing->clock * 10;
  76         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
  77
  78         /* Some VBTs have bogus h/vtotal values */
  79         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
  80                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
  81         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
  82                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
  83
  84         drm_mode_set_name(panel_fixed_mode);
  85 }
  86
  87 static void parse_backlight_data(struct drm_psb_private *dev_priv,
  88                                 struct bdb_header *bdb)
  89 {
  90         struct bdb_lvds_backlight *vbt_lvds_bl = NULL;
  91         struct bdb_lvds_backlight *lvds_bl;
  92         u8 p_type = 0;
  93         void *bl_start = NULL;
  94         struct bdb_lvds_options *lvds_opts
  95                                 = find_section(bdb, BDB_LVDS_OPTIONS);
  96
  97         dev_priv->lvds_bl = NULL;
  98
  99         if (lvds_opts) {
 100                 DRM_DEBUG("lvds_options found at %p\n", lvds_opts);
 101                 p_type = lvds_opts->panel_type;
 102         } else {
 103                 DRM_DEBUG("no lvds_options\n");
 104                 return;
 105         }
 106
 107         bl_start = find_section(bdb, BDB_LVDS_BACKLIGHT);
 108         vbt_lvds_bl = (struct bdb_lvds_backlight *)(bl_start + 1) + p_type;
 109
 110         lvds_bl = kzalloc(sizeof(*vbt_lvds_bl), GFP_KERNEL);
 111         if (!lvds_bl) {
 112                 DRM_DEBUG("No memory\n");
 113                 return;
 114         }
 115
 116         memcpy(lvds_bl, vbt_lvds_bl, sizeof(*vbt_lvds_bl));
 117
 118         dev_priv->lvds_bl = lvds_bl;
 119 }
 120
 121 /* Try to find integrated panel data */
 122 static void parse_lfp_panel_data(struct drm_psb_private *dev_priv,
 123                             struct bdb_header *bdb)
 124 {
 125         struct bdb_lvds_options *lvds_options;
 126         struct bdb_lvds_lfp_data *lvds_lfp_data;
 127         struct bdb_lvds_lfp_data_entry *entry;
 128         struct lvds_dvo_timing *dvo_timing;
 129         struct drm_display_mode *panel_fixed_mode;
 130
 131         /* Defaults if we can't find VBT info */
 132         dev_priv->lvds_dither = 0;
 133         dev_priv->lvds_vbt = 0;
 134
 135         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
 136         if (!lvds_options)
 137                 return;
 138
 139         dev_priv->lvds_dither = lvds_options->pixel_dither;
 140         if (lvds_options->panel_type == 0xff)
 141                 return;
 142
 143         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
 144         if (!lvds_lfp_data)
 145                 return;
 146
 147         dev_priv->lvds_vbt = 1;
 148
 149         entry = &lvds_lfp_data->data[lvds_options->panel_type];
 150         dvo_timing = &entry->dvo_timing;
 151
 152         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode),
 153                                       GFP_KERNEL);
 154
 155         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
 156
 157         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
 158
 159         DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
 160         drm_mode_debug_printmodeline(panel_fixed_mode);
 161
 162         return;
 163 }
 164
 165 /* Try to find sdvo panel data */
 166 static void parse_sdvo_panel_data(struct drm_psb_private *dev_priv,
 167                       struct bdb_header *bdb)
 168 {
 169         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
 170         struct lvds_dvo_timing *dvo_timing;
 171         struct drm_display_mode *panel_fixed_mode;
 172
 173         dev_priv->sdvo_lvds_vbt_mode = NULL;
 174
 175         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
 176         if (!sdvo_lvds_options)
 177                 return;
 178
 179         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
 180         if (!dvo_timing)
 181                 return;
 182
 183         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
 184
 185         if (!panel_fixed_mode)
 186                 return;
 187
 188         fill_detail_timing_data(panel_fixed_mode,
 189                         dvo_timing + sdvo_lvds_options->panel_type);
 190
 191         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
 192
 193         return;
 194 }
 195
 196 static void parse_general_features(struct drm_psb_private *dev_priv,
 197                        struct bdb_header *bdb)
 198 {
 199         struct bdb_general_features *general;
 200
 201         /* Set sensible defaults in case we can't find the general block */
 202         dev_priv->int_tv_support = 1;
 203         dev_priv->int_crt_support = 1;
 204
 205         general = find_section(bdb, BDB_GENERAL_FEATURES);
 206         if (general) {
 207                 dev_priv->int_tv_support = general->int_tv_support;
 208                 dev_priv->int_crt_support = general->int_crt_support;
 209                 dev_priv->lvds_use_ssc = general->enable_ssc;
 210
 211                 if (dev_priv->lvds_use_ssc) {
 212                         dev_priv->lvds_ssc_freq
 213                                 = general->ssc_freq ? 100 : 96;
 214                 }
 215         }
 216 }
 217
 218 /**
 219  * psb_intel_init_bios - initialize VBIOS settings & find VBT
 220  * @dev: DRM device
 221  *
 222  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
 223  * to appropriate values.
 224  *
 225  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
 226  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
 227  * feed an updated VBT back through that, compared to what we'll fetch using
 228  * this method of groping around in the BIOS data.
 229  *
 230  * Returns 0 on success, nonzero on failure.
 231  */
 232 bool psb_intel_init_bios(struct drm_device *dev)
 233 {
 234         struct drm_psb_private *dev_priv = dev->dev_private;
 235         struct pci_dev *pdev = dev->pdev;
 236         struct vbt_header *vbt = NULL;
 237         struct bdb_header *bdb;
 238         u8 __iomem *bios;
 239         size_t size;
 240         int i;
 241
 242         bios = pci_map_rom(pdev, &size);
 243         if (!bios)
 244                 return -1;
 245
 246         /* Scour memory looking for the VBT signature */
 247         for (i = 0; i + 4 < size; i++) {
 248                 if (!memcmp(bios + i, "$VBT", 4)) {
 249                         vbt = (struct vbt_header *)(bios + i);
 250                         break;
 251                 }
 252         }
 253
 254         if (!vbt) {
 255                 DRM_ERROR("VBT signature missing\n");
 256                 pci_unmap_rom(pdev, bios);
 257                 return -1;
 258         }
 259
 260         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
 261
 262         /* Grab useful general definitions */
 263         parse_general_features(dev_priv, bdb);
 264         parse_lfp_panel_data(dev_priv, bdb);
 265         parse_sdvo_panel_data(dev_priv, bdb);
 266         parse_backlight_data(dev_priv, bdb);
 267
 268         pci_unmap_rom(pdev, bios);
 269
 270         return 0;
 271 }
 272
 273 /**
 274  * Destroy and free VBT data
 275  */
 276 void psb_intel_destroy_bios(struct drm_device *dev)
 277 {
 278         struct drm_psb_private *dev_priv = dev->dev_private;
 279         struct drm_display_mode *sdvo_lvds_vbt_mode =
 280                                 dev_priv->sdvo_lvds_vbt_mode;
 281         struct drm_display_mode *lfp_lvds_vbt_mode =
 282                                 dev_priv->lfp_lvds_vbt_mode;
 283         struct bdb_lvds_backlight *lvds_bl =
 284                                 dev_priv->lvds_bl;
 285
 286         /*free sdvo panel mode*/
 287         if (sdvo_lvds_vbt_mode) {
 288                 dev_priv->sdvo_lvds_vbt_mode = NULL;
 289                 kfree(sdvo_lvds_vbt_mode);
 290         }
 291
 292         if (lfp_lvds_vbt_mode) {
 293                 dev_priv->lfp_lvds_vbt_mode = NULL;
 294                 kfree(lfp_lvds_vbt_mode);
 295         }
 296
 297         if (lvds_bl) {
 298                 dev_priv->lvds_bl = NULL;
 299                 kfree(lvds_bl);
 300         }
 301 }