2 * Copyright © 2006 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 * Eric Anholt <eric@anholt.net>
31 #include "intel_bios.h"
35 i830_bios_get_aim_data_block (ScrnInfoPtr pScrn, int aim, int data_block)
41 struct vbt_header *vbt;
42 struct aimdb_header *aimdb;
43 struct aimdb_block *aimdb_block;
45 bios = i830_bios_get (pScrn);
49 vbt_off = INTEL_BIOS_16(0x1a);
50 vbt = (struct vbt_header *)(bios + vbt_off);
52 aim_off = vbt->aim_offset[aim];
58 xf86DrvMsg(pScrn->scrnIndex, X_INFO, "aim_off %d\n", aim_off);
59 aimdb = (struct aimdb_header *) (bios + vbt_off + aim_off);
60 bdb_off = aimdb->aimdb_header_size;
61 while (bdb_off < aimdb->aimdb_size)
63 aimdb_block = (struct aimdb_block *) (bios + vbt_off + aim_off + bdb_off);
64 if (aimdb_block->aimdb_id == data_block)
66 unsigned char *aim = malloc (aimdb_block->aimdb_size + sizeof (struct aimdb_block));
72 memcpy (aim, aimdb_block, aimdb_block->aimdb_size + sizeof (struct aimdb_block));
76 bdb_off += aimdb_block->aimdb_size + sizeof (struct aimdb_block);
84 find_section(struct bdb_header *bdb, int section_id)
88 u16 total, current_size;
91 /* skip to first section */
92 index += bdb->header_size;
93 total = bdb->bdb_size;
95 /* walk the sections looking for section_id */
96 while (index < total) {
97 current_id = *(base + index);
99 current_size = *((u16 *)(base + index));
101 if (current_id == section_id)
103 index += current_size;
109 /* Try to find panel data */
111 parse_panel_data(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
113 struct bdb_lvds_options *lvds_options;
114 struct bdb_lvds_lfp_data *lvds_lfp_data;
115 struct bdb_lvds_lfp_data_entry *entry;
116 struct lvds_dvo_timing *dvo_timing;
117 struct drm_display_mode *panel_fixed_mode;
119 /* Defaults if we can't find VBT info */
120 dev_priv->lvds_dither = 0;
121 dev_priv->lvds_vbt = 0;
123 lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
127 dev_priv->lvds_dither = lvds_options->pixel_dither;
128 if (lvds_options->panel_type == 0xff)
131 lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
135 dev_priv->lvds_vbt = 1;
137 entry = &lvds_lfp_data->data[lvds_options->panel_type];
138 dvo_timing = &entry->dvo_timing;
140 panel_fixed_mode = drm_calloc(1, sizeof(*panel_fixed_mode),
143 panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
144 dvo_timing->hactive_lo;
145 panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
146 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
147 panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
148 dvo_timing->hsync_pulse_width;
149 panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
150 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
152 panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
153 dvo_timing->vactive_lo;
154 panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
155 dvo_timing->vsync_off;
156 panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
157 dvo_timing->vsync_pulse_width;
158 panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
159 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
160 panel_fixed_mode->clock = dvo_timing->clock * 10;
161 panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
163 drm_mode_set_name(panel_fixed_mode);
165 dev_priv->vbt_mode = panel_fixed_mode;
167 DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
168 drm_mode_debug_printmodeline(panel_fixed_mode);
174 parse_general_features(struct drm_i915_private *dev_priv,
175 struct bdb_header *bdb)
177 struct bdb_general_features *general;
179 /* Set sensible defaults in case we can't find the general block */
180 dev_priv->int_tv_support = 1;
181 dev_priv->int_crt_support = 1;
183 general = find_section(bdb, BDB_GENERAL_FEATURES);
185 dev_priv->int_tv_support = general->int_tv_support;
186 dev_priv->int_crt_support = general->int_crt_support;
191 * intel_init_bios - initialize VBIOS settings & find VBT
194 * Loads the Video BIOS and checks that the VBT exists. Sets scratch registers
195 * to appropriate values.
197 * VBT existence is a sanity check that is relied on by other i830_bios.c code.
198 * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
199 * feed an updated VBT back through that, compared to what we'll fetch using
200 * this method of groping around in the BIOS data.
202 * Returns 0 on success, nonzero on failure.
205 intel_init_bios(struct drm_device *dev)
207 struct drm_i915_private *dev_priv = dev->dev_private;
208 struct pci_dev *pdev = dev->pdev;
209 struct vbt_header *vbt = NULL;
210 struct bdb_header *bdb;
215 bios = pci_map_rom(pdev, &size);
219 /* Scour memory looking for the VBT signature */
220 for (i = 0; i + 4 < size; i++) {
221 if (!memcmp(bios + i, "$VBT", 4)) {
222 vbt = (struct vbt_header *)(bios + i);
228 DRM_ERROR("VBT signature missing\n");
229 pci_unmap_rom(pdev, bios);
233 bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
235 /* Grab useful general definitions */
236 parse_general_features(dev_priv, bdb);
237 parse_panel_data(dev_priv, bdb);
239 pci_unmap_rom(pdev, bios);