drm: Apply "Memory fragmentation from lost alignment blocks"
[linux-2.6] / drivers / gpu / drm / i915 / intel_bios.c
1 /*
2  * Copyright © 2006 Intel Corporation
3  *
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:
10  *
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
13  * Software.
14  *
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
21  * SOFTWARE.
22  *
23  * Authors:
24  *    Eric Anholt <eric@anholt.net>
25  *
26  */
27 #include "drmP.h"
28 #include "drm.h"
29 #include "i915_drm.h"
30 #include "i915_drv.h"
31 #include "intel_bios.h"
32
33 #define SLAVE_ADDR1     0x70
34 #define SLAVE_ADDR2     0x72
35
36 static void *
37 find_section(struct bdb_header *bdb, int section_id)
38 {
39         u8 *base = (u8 *)bdb;
40         int index = 0;
41         u16 total, current_size;
42         u8 current_id;
43
44         /* skip to first section */
45         index += bdb->header_size;
46         total = bdb->bdb_size;
47
48         /* walk the sections looking for section_id */
49         while (index < total) {
50                 current_id = *(base + index);
51                 index++;
52                 current_size = *((u16 *)(base + index));
53                 index += 2;
54                 if (current_id == section_id)
55                         return base + index;
56                 index += current_size;
57         }
58
59         return NULL;
60 }
61
62 static void
63 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
64                         struct lvds_dvo_timing *dvo_timing)
65 {
66         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
67                 dvo_timing->hactive_lo;
68         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
69                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
70         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
71                 dvo_timing->hsync_pulse_width;
72         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
73                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
74
75         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
76                 dvo_timing->vactive_lo;
77         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
78                 dvo_timing->vsync_off;
79         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
80                 dvo_timing->vsync_pulse_width;
81         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
82                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
83         panel_fixed_mode->clock = dvo_timing->clock * 10;
84         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
85
86         /* Some VBTs have bogus h/vtotal values */
87         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
88                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
89         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
90                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
91
92         drm_mode_set_name(panel_fixed_mode);
93 }
94
95 /* Try to find integrated panel data */
96 static void
97 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
98                             struct bdb_header *bdb)
99 {
100         struct bdb_lvds_options *lvds_options;
101         struct bdb_lvds_lfp_data *lvds_lfp_data;
102         struct bdb_lvds_lfp_data_entry *entry;
103         struct lvds_dvo_timing *dvo_timing;
104         struct drm_display_mode *panel_fixed_mode;
105
106         /* Defaults if we can't find VBT info */
107         dev_priv->lvds_dither = 0;
108         dev_priv->lvds_vbt = 0;
109
110         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
111         if (!lvds_options)
112                 return;
113
114         dev_priv->lvds_dither = lvds_options->pixel_dither;
115         if (lvds_options->panel_type == 0xff)
116                 return;
117
118         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
119         if (!lvds_lfp_data)
120                 return;
121
122         dev_priv->lvds_vbt = 1;
123
124         entry = &lvds_lfp_data->data[lvds_options->panel_type];
125         dvo_timing = &entry->dvo_timing;
126
127         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
128
129         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
130
131         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
132
133         DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
134         drm_mode_debug_printmodeline(panel_fixed_mode);
135
136         return;
137 }
138
139 /* Try to find sdvo panel data */
140 static void
141 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
142                       struct bdb_header *bdb)
143 {
144         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
145         struct lvds_dvo_timing *dvo_timing;
146         struct drm_display_mode *panel_fixed_mode;
147
148         dev_priv->sdvo_lvds_vbt_mode = NULL;
149
150         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
151         if (!sdvo_lvds_options)
152                 return;
153
154         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
155         if (!dvo_timing)
156                 return;
157
158         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
159
160         if (!panel_fixed_mode)
161                 return;
162
163         fill_detail_timing_data(panel_fixed_mode,
164                         dvo_timing + sdvo_lvds_options->panel_type);
165
166         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
167
168         return;
169 }
170
171 static void
172 parse_general_features(struct drm_i915_private *dev_priv,
173                        struct bdb_header *bdb)
174 {
175         struct bdb_general_features *general;
176
177         /* Set sensible defaults in case we can't find the general block */
178         dev_priv->int_tv_support = 1;
179         dev_priv->int_crt_support = 1;
180
181         general = find_section(bdb, BDB_GENERAL_FEATURES);
182         if (general) {
183                 dev_priv->int_tv_support = general->int_tv_support;
184                 dev_priv->int_crt_support = general->int_crt_support;
185                 dev_priv->lvds_use_ssc = general->enable_ssc;
186
187                 if (dev_priv->lvds_use_ssc) {
188                   if (IS_I855(dev_priv->dev))
189                     dev_priv->lvds_ssc_freq = general->ssc_freq ? 66 : 48;
190                   else
191                     dev_priv->lvds_ssc_freq = general->ssc_freq ? 100 : 96;
192                 }
193         }
194 }
195
196 static void
197 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
198                        struct bdb_header *bdb)
199 {
200         struct sdvo_device_mapping *p_mapping;
201         struct bdb_general_definitions *p_defs;
202         struct child_device_config *p_child;
203         int i, child_device_num, count;
204         u16     block_size, *block_ptr;
205
206         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
207         if (!p_defs) {
208                 DRM_DEBUG("No general definition block is found\n");
209                 return;
210         }
211         /* judge whether the size of child device meets the requirements.
212          * If the child device size obtained from general definition block
213          * is different with sizeof(struct child_device_config), skip the
214          * parsing of sdvo device info
215          */
216         if (p_defs->child_dev_size != sizeof(*p_child)) {
217                 /* different child dev size . Ignore it */
218                 DRM_DEBUG("different child size is found. Invalid.\n");
219                 return;
220         }
221         /* get the block size of general definitions */
222         block_ptr = (u16 *)((char *)p_defs - 2);
223         block_size = *block_ptr;
224         /* get the number of child device */
225         child_device_num = (block_size - sizeof(*p_defs)) /
226                                 sizeof(*p_child);
227         count = 0;
228         for (i = 0; i < child_device_num; i++) {
229                 p_child = &(p_defs->devices[i]);
230                 if (!p_child->device_type) {
231                         /* skip the device block if device type is invalid */
232                         continue;
233                 }
234                 if (p_child->slave_addr != SLAVE_ADDR1 &&
235                         p_child->slave_addr != SLAVE_ADDR2) {
236                         /*
237                          * If the slave address is neither 0x70 nor 0x72,
238                          * it is not a SDVO device. Skip it.
239                          */
240                         continue;
241                 }
242                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
243                         p_child->dvo_port != DEVICE_PORT_DVOC) {
244                         /* skip the incorrect SDVO port */
245                         DRM_DEBUG("Incorrect SDVO port. Skip it \n");
246                         continue;
247                 }
248                 DRM_DEBUG("the SDVO device with slave addr %2x is found on "
249                                 "%s port\n",
250                                 p_child->slave_addr,
251                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
252                                         "SDVOB" : "SDVOC");
253                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
254                 if (!p_mapping->initialized) {
255                         p_mapping->dvo_port = p_child->dvo_port;
256                         p_mapping->slave_addr = p_child->slave_addr;
257                         p_mapping->dvo_wiring = p_child->dvo_wiring;
258                         p_mapping->initialized = 1;
259                 } else {
260                         DRM_DEBUG("Maybe one SDVO port is shared by "
261                                          "two SDVO device.\n");
262                 }
263                 if (p_child->slave2_addr) {
264                         /* Maybe this is a SDVO device with multiple inputs */
265                         /* And the mapping info is not added */
266                         DRM_DEBUG("there exists the slave2_addr. Maybe this "
267                                 "is a SDVO device with multiple inputs.\n");
268                 }
269                 count++;
270         }
271
272         if (!count) {
273                 /* No SDVO device info is found */
274                 DRM_DEBUG("No SDVO device info is found in VBT\n");
275         }
276         return;
277 }
278 /**
279  * intel_init_bios - initialize VBIOS settings & find VBT
280  * @dev: DRM device
281  *
282  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
283  * to appropriate values.
284  *
285  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
286  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
287  * feed an updated VBT back through that, compared to what we'll fetch using
288  * this method of groping around in the BIOS data.
289  *
290  * Returns 0 on success, nonzero on failure.
291  */
292 bool
293 intel_init_bios(struct drm_device *dev)
294 {
295         struct drm_i915_private *dev_priv = dev->dev_private;
296         struct pci_dev *pdev = dev->pdev;
297         struct vbt_header *vbt = NULL;
298         struct bdb_header *bdb;
299         u8 __iomem *bios;
300         size_t size;
301         int i;
302
303         bios = pci_map_rom(pdev, &size);
304         if (!bios)
305                 return -1;
306
307         /* Scour memory looking for the VBT signature */
308         for (i = 0; i + 4 < size; i++) {
309                 if (!memcmp(bios + i, "$VBT", 4)) {
310                         vbt = (struct vbt_header *)(bios + i);
311                         break;
312                 }
313         }
314
315         if (!vbt) {
316                 DRM_ERROR("VBT signature missing\n");
317                 pci_unmap_rom(pdev, bios);
318                 return -1;
319         }
320
321         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
322
323         /* Grab useful general definitions */
324         parse_general_features(dev_priv, bdb);
325         parse_lfp_panel_data(dev_priv, bdb);
326         parse_sdvo_panel_data(dev_priv, bdb);
327         parse_sdvo_device_mapping(dev_priv, bdb);
328         pci_unmap_rom(pdev, bios);
329
330         return 0;
331 }