Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp
[linux-2.6.git] / 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 u16
63 get_blocksize(void *p)
64 {
65         u16 *block_ptr, block_size;
66
67         block_ptr = (u16 *)((char *)p - 2);
68         block_size = *block_ptr;
69         return block_size;
70 }
71
72 static void
73 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
74                         struct lvds_dvo_timing *dvo_timing)
75 {
76         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
77                 dvo_timing->hactive_lo;
78         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
79                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
80         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
81                 dvo_timing->hsync_pulse_width;
82         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
83                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
84
85         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
86                 dvo_timing->vactive_lo;
87         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
88                 dvo_timing->vsync_off;
89         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
90                 dvo_timing->vsync_pulse_width;
91         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
92                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
93         panel_fixed_mode->clock = dvo_timing->clock * 10;
94         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
95
96         /* Some VBTs have bogus h/vtotal values */
97         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
98                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
99         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
100                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
101
102         drm_mode_set_name(panel_fixed_mode);
103 }
104
105 /* Try to find integrated panel data */
106 static void
107 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
108                             struct bdb_header *bdb)
109 {
110         struct bdb_lvds_options *lvds_options;
111         struct bdb_lvds_lfp_data *lvds_lfp_data;
112         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
113         struct bdb_lvds_lfp_data_entry *entry;
114         struct lvds_dvo_timing *dvo_timing;
115         struct drm_display_mode *panel_fixed_mode;
116         int lfp_data_size, dvo_timing_offset;
117
118         /* Defaults if we can't find VBT info */
119         dev_priv->lvds_dither = 0;
120         dev_priv->lvds_vbt = 0;
121
122         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
123         if (!lvds_options)
124                 return;
125
126         dev_priv->lvds_dither = lvds_options->pixel_dither;
127         if (lvds_options->panel_type == 0xff)
128                 return;
129
130         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
131         if (!lvds_lfp_data)
132                 return;
133
134         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
135         if (!lvds_lfp_data_ptrs)
136                 return;
137
138         dev_priv->lvds_vbt = 1;
139
140         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
141                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
142         entry = (struct bdb_lvds_lfp_data_entry *)
143                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
144                                                    lvds_options->panel_type));
145         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
146                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
147
148         /*
149          * the size of fp_timing varies on the different platform.
150          * So calculate the DVO timing relative offset in LVDS data
151          * entry to get the DVO timing entry
152          */
153         dvo_timing = (struct lvds_dvo_timing *)
154                         ((unsigned char *)entry + dvo_timing_offset);
155
156         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
157
158         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
159
160         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
161
162         DRM_DEBUG("Found panel mode in BIOS VBT tables:\n");
163         drm_mode_debug_printmodeline(panel_fixed_mode);
164
165         return;
166 }
167
168 /* Try to find sdvo panel data */
169 static void
170 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
171                       struct bdb_header *bdb)
172 {
173         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
174         struct lvds_dvo_timing *dvo_timing;
175         struct drm_display_mode *panel_fixed_mode;
176
177         dev_priv->sdvo_lvds_vbt_mode = NULL;
178
179         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
180         if (!sdvo_lvds_options)
181                 return;
182
183         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
184         if (!dvo_timing)
185                 return;
186
187         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
188
189         if (!panel_fixed_mode)
190                 return;
191
192         fill_detail_timing_data(panel_fixed_mode,
193                         dvo_timing + sdvo_lvds_options->panel_type);
194
195         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
196
197         return;
198 }
199
200 static void
201 parse_general_features(struct drm_i915_private *dev_priv,
202                        struct bdb_header *bdb)
203 {
204         struct bdb_general_features *general;
205
206         /* Set sensible defaults in case we can't find the general block */
207         dev_priv->int_tv_support = 1;
208         dev_priv->int_crt_support = 1;
209
210         general = find_section(bdb, BDB_GENERAL_FEATURES);
211         if (general) {
212                 dev_priv->int_tv_support = general->int_tv_support;
213                 dev_priv->int_crt_support = general->int_crt_support;
214                 dev_priv->lvds_use_ssc = general->enable_ssc;
215
216                 if (dev_priv->lvds_use_ssc) {
217                         if (IS_I85X(dev_priv->dev))
218                                 dev_priv->lvds_ssc_freq =
219                                         general->ssc_freq ? 66 : 48;
220                         else if (IS_IGDNG(dev_priv->dev))
221                                 dev_priv->lvds_ssc_freq =
222                                         general->ssc_freq ? 100 : 120;
223                         else
224                                 dev_priv->lvds_ssc_freq =
225                                         general->ssc_freq ? 100 : 96;
226                 }
227         }
228 }
229
230 static void
231 parse_general_definitions(struct drm_i915_private *dev_priv,
232                           struct bdb_header *bdb)
233 {
234         struct bdb_general_definitions *general;
235         const int crt_bus_map_table[] = {
236                 GPIOB,
237                 GPIOA,
238                 GPIOC,
239                 GPIOD,
240                 GPIOE,
241                 GPIOF,
242         };
243
244         /* Set sensible defaults in case we can't find the general block
245            or it is the wrong chipset */
246         dev_priv->crt_ddc_bus = -1;
247
248         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
249         if (general) {
250                 u16 block_size = get_blocksize(general);
251                 if (block_size >= sizeof(*general)) {
252                         int bus_pin = general->crt_ddc_gmbus_pin;
253                         DRM_DEBUG("crt_ddc_bus_pin: %d\n", bus_pin);
254                         if ((bus_pin >= 1) && (bus_pin <= 6)) {
255                                 dev_priv->crt_ddc_bus =
256                                         crt_bus_map_table[bus_pin-1];
257                         }
258                 } else {
259                         DRM_DEBUG("BDB_GD too small (%d). Invalid.\n",
260                                   block_size);
261                 }
262         }
263 }
264
265 static void
266 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
267                        struct bdb_header *bdb)
268 {
269         struct sdvo_device_mapping *p_mapping;
270         struct bdb_general_definitions *p_defs;
271         struct child_device_config *p_child;
272         int i, child_device_num, count;
273         u16     block_size;
274
275         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
276         if (!p_defs) {
277                 DRM_DEBUG("No general definition block is found\n");
278                 return;
279         }
280         /* judge whether the size of child device meets the requirements.
281          * If the child device size obtained from general definition block
282          * is different with sizeof(struct child_device_config), skip the
283          * parsing of sdvo device info
284          */
285         if (p_defs->child_dev_size != sizeof(*p_child)) {
286                 /* different child dev size . Ignore it */
287                 DRM_DEBUG("different child size is found. Invalid.\n");
288                 return;
289         }
290         /* get the block size of general definitions */
291         block_size = get_blocksize(p_defs);
292         /* get the number of child device */
293         child_device_num = (block_size - sizeof(*p_defs)) /
294                                 sizeof(*p_child);
295         count = 0;
296         for (i = 0; i < child_device_num; i++) {
297                 p_child = &(p_defs->devices[i]);
298                 if (!p_child->device_type) {
299                         /* skip the device block if device type is invalid */
300                         continue;
301                 }
302                 if (p_child->slave_addr != SLAVE_ADDR1 &&
303                         p_child->slave_addr != SLAVE_ADDR2) {
304                         /*
305                          * If the slave address is neither 0x70 nor 0x72,
306                          * it is not a SDVO device. Skip it.
307                          */
308                         continue;
309                 }
310                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
311                         p_child->dvo_port != DEVICE_PORT_DVOC) {
312                         /* skip the incorrect SDVO port */
313                         DRM_DEBUG("Incorrect SDVO port. Skip it \n");
314                         continue;
315                 }
316                 DRM_DEBUG("the SDVO device with slave addr %2x is found on "
317                                 "%s port\n",
318                                 p_child->slave_addr,
319                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
320                                         "SDVOB" : "SDVOC");
321                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
322                 if (!p_mapping->initialized) {
323                         p_mapping->dvo_port = p_child->dvo_port;
324                         p_mapping->slave_addr = p_child->slave_addr;
325                         p_mapping->dvo_wiring = p_child->dvo_wiring;
326                         p_mapping->initialized = 1;
327                 } else {
328                         DRM_DEBUG("Maybe one SDVO port is shared by "
329                                          "two SDVO device.\n");
330                 }
331                 if (p_child->slave2_addr) {
332                         /* Maybe this is a SDVO device with multiple inputs */
333                         /* And the mapping info is not added */
334                         DRM_DEBUG("there exists the slave2_addr. Maybe this "
335                                 "is a SDVO device with multiple inputs.\n");
336                 }
337                 count++;
338         }
339
340         if (!count) {
341                 /* No SDVO device info is found */
342                 DRM_DEBUG("No SDVO device info is found in VBT\n");
343         }
344         return;
345 }
346
347 static void
348 parse_driver_features(struct drm_i915_private *dev_priv,
349                        struct bdb_header *bdb)
350 {
351         struct drm_device *dev = dev_priv->dev;
352         struct bdb_driver_features *driver;
353
354         driver = find_section(bdb, BDB_DRIVER_FEATURES);
355         if (!driver)
356                 return;
357
358         if (driver && SUPPORTS_EDP(dev) &&
359             driver->lvds_config == BDB_DRIVER_FEATURE_EDP) {
360                 dev_priv->edp_support = 1;
361         } else {
362                 dev_priv->edp_support = 0;
363         }
364
365         if (driver && driver->dual_frequency)
366                 dev_priv->render_reclock_avail = true;
367 }
368
369 /**
370  * intel_init_bios - initialize VBIOS settings & find VBT
371  * @dev: DRM device
372  *
373  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
374  * to appropriate values.
375  *
376  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
377  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
378  * feed an updated VBT back through that, compared to what we'll fetch using
379  * this method of groping around in the BIOS data.
380  *
381  * Returns 0 on success, nonzero on failure.
382  */
383 bool
384 intel_init_bios(struct drm_device *dev)
385 {
386         struct drm_i915_private *dev_priv = dev->dev_private;
387         struct pci_dev *pdev = dev->pdev;
388         struct vbt_header *vbt = NULL;
389         struct bdb_header *bdb;
390         u8 __iomem *bios;
391         size_t size;
392         int i;
393
394         bios = pci_map_rom(pdev, &size);
395         if (!bios)
396                 return -1;
397
398         /* Scour memory looking for the VBT signature */
399         for (i = 0; i + 4 < size; i++) {
400                 if (!memcmp(bios + i, "$VBT", 4)) {
401                         vbt = (struct vbt_header *)(bios + i);
402                         break;
403                 }
404         }
405
406         if (!vbt) {
407                 DRM_ERROR("VBT signature missing\n");
408                 pci_unmap_rom(pdev, bios);
409                 return -1;
410         }
411
412         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
413
414         /* Grab useful general definitions */
415         parse_general_features(dev_priv, bdb);
416         parse_general_definitions(dev_priv, bdb);
417         parse_lfp_panel_data(dev_priv, bdb);
418         parse_sdvo_panel_data(dev_priv, bdb);
419         parse_sdvo_device_mapping(dev_priv, bdb);
420         parse_driver_features(dev_priv, bdb);
421
422         pci_unmap_rom(pdev, bios);
423
424         return 0;
425 }