Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied...
[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         int i, temp_downclock;
118         struct drm_display_mode *temp_mode;
119
120         /* Defaults if we can't find VBT info */
121         dev_priv->lvds_dither = 0;
122         dev_priv->lvds_vbt = 0;
123
124         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
125         if (!lvds_options)
126                 return;
127
128         dev_priv->lvds_dither = lvds_options->pixel_dither;
129         if (lvds_options->panel_type == 0xff)
130                 return;
131
132         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
133         if (!lvds_lfp_data)
134                 return;
135
136         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
137         if (!lvds_lfp_data_ptrs)
138                 return;
139
140         dev_priv->lvds_vbt = 1;
141
142         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
143                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
144         entry = (struct bdb_lvds_lfp_data_entry *)
145                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
146                                                    lvds_options->panel_type));
147         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
148                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
149
150         /*
151          * the size of fp_timing varies on the different platform.
152          * So calculate the DVO timing relative offset in LVDS data
153          * entry to get the DVO timing entry
154          */
155         dvo_timing = (struct lvds_dvo_timing *)
156                         ((unsigned char *)entry + dvo_timing_offset);
157
158         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
159
160         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
161
162         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
163
164         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
165         drm_mode_debug_printmodeline(panel_fixed_mode);
166
167         temp_mode = kzalloc(sizeof(*temp_mode), GFP_KERNEL);
168         temp_downclock = panel_fixed_mode->clock;
169         /*
170          * enumerate the LVDS panel timing info entry in VBT to check whether
171          * the LVDS downclock is found.
172          */
173         for (i = 0; i < 16; i++) {
174                 entry = (struct bdb_lvds_lfp_data_entry *)
175                         ((uint8_t *)lvds_lfp_data->data + (lfp_data_size * i));
176                 dvo_timing = (struct lvds_dvo_timing *)
177                         ((unsigned char *)entry + dvo_timing_offset);
178
179                 fill_detail_timing_data(temp_mode, dvo_timing);
180
181                 if (temp_mode->hdisplay == panel_fixed_mode->hdisplay &&
182                 temp_mode->hsync_start == panel_fixed_mode->hsync_start &&
183                 temp_mode->hsync_end == panel_fixed_mode->hsync_end &&
184                 temp_mode->htotal == panel_fixed_mode->htotal &&
185                 temp_mode->vdisplay == panel_fixed_mode->vdisplay &&
186                 temp_mode->vsync_start == panel_fixed_mode->vsync_start &&
187                 temp_mode->vsync_end == panel_fixed_mode->vsync_end &&
188                 temp_mode->vtotal == panel_fixed_mode->vtotal &&
189                 temp_mode->clock < temp_downclock) {
190                         /*
191                          * downclock is already found. But we expect
192                          * to find the lower downclock.
193                          */
194                         temp_downclock = temp_mode->clock;
195                 }
196                 /* clear it to zero */
197                 memset(temp_mode, 0, sizeof(*temp_mode));
198         }
199         kfree(temp_mode);
200         if (temp_downclock < panel_fixed_mode->clock) {
201                 dev_priv->lvds_downclock_avail = 1;
202                 dev_priv->lvds_downclock = temp_downclock;
203                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. ",
204                                 "Normal Clock %dKHz, downclock %dKHz\n",
205                                 temp_downclock, panel_fixed_mode->clock);
206         }
207         return;
208 }
209
210 /* Try to find sdvo panel data */
211 static void
212 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
213                       struct bdb_header *bdb)
214 {
215         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
216         struct lvds_dvo_timing *dvo_timing;
217         struct drm_display_mode *panel_fixed_mode;
218
219         dev_priv->sdvo_lvds_vbt_mode = NULL;
220
221         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
222         if (!sdvo_lvds_options)
223                 return;
224
225         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
226         if (!dvo_timing)
227                 return;
228
229         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
230
231         if (!panel_fixed_mode)
232                 return;
233
234         fill_detail_timing_data(panel_fixed_mode,
235                         dvo_timing + sdvo_lvds_options->panel_type);
236
237         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
238
239         return;
240 }
241
242 static void
243 parse_general_features(struct drm_i915_private *dev_priv,
244                        struct bdb_header *bdb)
245 {
246         struct bdb_general_features *general;
247
248         /* Set sensible defaults in case we can't find the general block */
249         dev_priv->int_tv_support = 1;
250         dev_priv->int_crt_support = 1;
251
252         general = find_section(bdb, BDB_GENERAL_FEATURES);
253         if (general) {
254                 dev_priv->int_tv_support = general->int_tv_support;
255                 dev_priv->int_crt_support = general->int_crt_support;
256                 dev_priv->lvds_use_ssc = general->enable_ssc;
257
258                 if (dev_priv->lvds_use_ssc) {
259                         if (IS_I85X(dev_priv->dev))
260                                 dev_priv->lvds_ssc_freq =
261                                         general->ssc_freq ? 66 : 48;
262                         else if (IS_IRONLAKE(dev_priv->dev))
263                                 dev_priv->lvds_ssc_freq =
264                                         general->ssc_freq ? 100 : 120;
265                         else
266                                 dev_priv->lvds_ssc_freq =
267                                         general->ssc_freq ? 100 : 96;
268                 }
269         }
270 }
271
272 static void
273 parse_general_definitions(struct drm_i915_private *dev_priv,
274                           struct bdb_header *bdb)
275 {
276         struct bdb_general_definitions *general;
277         const int crt_bus_map_table[] = {
278                 GPIOB,
279                 GPIOA,
280                 GPIOC,
281                 GPIOD,
282                 GPIOE,
283                 GPIOF,
284         };
285
286         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
287         if (general) {
288                 u16 block_size = get_blocksize(general);
289                 if (block_size >= sizeof(*general)) {
290                         int bus_pin = general->crt_ddc_gmbus_pin;
291                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
292                         if ((bus_pin >= 1) && (bus_pin <= 6)) {
293                                 dev_priv->crt_ddc_bus =
294                                         crt_bus_map_table[bus_pin-1];
295                         }
296                 } else {
297                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
298                                   block_size);
299                 }
300         }
301 }
302
303 static void
304 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
305                        struct bdb_header *bdb)
306 {
307         struct sdvo_device_mapping *p_mapping;
308         struct bdb_general_definitions *p_defs;
309         struct child_device_config *p_child;
310         int i, child_device_num, count;
311         u16     block_size;
312
313         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
314         if (!p_defs) {
315                 DRM_DEBUG_KMS("No general definition block is found\n");
316                 return;
317         }
318         /* judge whether the size of child device meets the requirements.
319          * If the child device size obtained from general definition block
320          * is different with sizeof(struct child_device_config), skip the
321          * parsing of sdvo device info
322          */
323         if (p_defs->child_dev_size != sizeof(*p_child)) {
324                 /* different child dev size . Ignore it */
325                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
326                 return;
327         }
328         /* get the block size of general definitions */
329         block_size = get_blocksize(p_defs);
330         /* get the number of child device */
331         child_device_num = (block_size - sizeof(*p_defs)) /
332                                 sizeof(*p_child);
333         count = 0;
334         for (i = 0; i < child_device_num; i++) {
335                 p_child = &(p_defs->devices[i]);
336                 if (!p_child->device_type) {
337                         /* skip the device block if device type is invalid */
338                         continue;
339                 }
340                 if (p_child->slave_addr != SLAVE_ADDR1 &&
341                         p_child->slave_addr != SLAVE_ADDR2) {
342                         /*
343                          * If the slave address is neither 0x70 nor 0x72,
344                          * it is not a SDVO device. Skip it.
345                          */
346                         continue;
347                 }
348                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
349                         p_child->dvo_port != DEVICE_PORT_DVOC) {
350                         /* skip the incorrect SDVO port */
351                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
352                         continue;
353                 }
354                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
355                                 " %s port\n",
356                                 p_child->slave_addr,
357                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
358                                         "SDVOB" : "SDVOC");
359                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
360                 if (!p_mapping->initialized) {
361                         p_mapping->dvo_port = p_child->dvo_port;
362                         p_mapping->slave_addr = p_child->slave_addr;
363                         p_mapping->dvo_wiring = p_child->dvo_wiring;
364                         p_mapping->initialized = 1;
365                 } else {
366                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
367                                          "two SDVO device.\n");
368                 }
369                 if (p_child->slave2_addr) {
370                         /* Maybe this is a SDVO device with multiple inputs */
371                         /* And the mapping info is not added */
372                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
373                                 " is a SDVO device with multiple inputs.\n");
374                 }
375                 count++;
376         }
377
378         if (!count) {
379                 /* No SDVO device info is found */
380                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
381         }
382         return;
383 }
384
385 static void
386 parse_driver_features(struct drm_i915_private *dev_priv,
387                        struct bdb_header *bdb)
388 {
389         struct drm_device *dev = dev_priv->dev;
390         struct bdb_driver_features *driver;
391
392         driver = find_section(bdb, BDB_DRIVER_FEATURES);
393         if (!driver)
394                 return;
395
396         if (driver && SUPPORTS_EDP(dev) &&
397             driver->lvds_config == BDB_DRIVER_FEATURE_EDP) {
398                 dev_priv->edp_support = 1;
399         } else {
400                 dev_priv->edp_support = 0;
401         }
402
403         if (driver && driver->dual_frequency)
404                 dev_priv->render_reclock_avail = true;
405 }
406
407 static void
408 parse_device_mapping(struct drm_i915_private *dev_priv,
409                        struct bdb_header *bdb)
410 {
411         struct bdb_general_definitions *p_defs;
412         struct child_device_config *p_child, *child_dev_ptr;
413         int i, child_device_num, count;
414         u16     block_size;
415
416         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
417         if (!p_defs) {
418                 DRM_DEBUG_KMS("No general definition block is found\n");
419                 return;
420         }
421         /* judge whether the size of child device meets the requirements.
422          * If the child device size obtained from general definition block
423          * is different with sizeof(struct child_device_config), skip the
424          * parsing of sdvo device info
425          */
426         if (p_defs->child_dev_size != sizeof(*p_child)) {
427                 /* different child dev size . Ignore it */
428                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
429                 return;
430         }
431         /* get the block size of general definitions */
432         block_size = get_blocksize(p_defs);
433         /* get the number of child device */
434         child_device_num = (block_size - sizeof(*p_defs)) /
435                                 sizeof(*p_child);
436         count = 0;
437         /* get the number of child device that is present */
438         for (i = 0; i < child_device_num; i++) {
439                 p_child = &(p_defs->devices[i]);
440                 if (!p_child->device_type) {
441                         /* skip the device block if device type is invalid */
442                         continue;
443                 }
444                 count++;
445         }
446         if (!count) {
447                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
448                 return;
449         }
450         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
451         if (!dev_priv->child_dev) {
452                 DRM_DEBUG_KMS("No memory space for child device\n");
453                 return;
454         }
455
456         dev_priv->child_dev_num = count;
457         count = 0;
458         for (i = 0; i < child_device_num; i++) {
459                 p_child = &(p_defs->devices[i]);
460                 if (!p_child->device_type) {
461                         /* skip the device block if device type is invalid */
462                         continue;
463                 }
464                 child_dev_ptr = dev_priv->child_dev + count;
465                 count++;
466                 memcpy((void *)child_dev_ptr, (void *)p_child,
467                                         sizeof(*p_child));
468         }
469         return;
470 }
471 /**
472  * intel_init_bios - initialize VBIOS settings & find VBT
473  * @dev: DRM device
474  *
475  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
476  * to appropriate values.
477  *
478  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
479  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
480  * feed an updated VBT back through that, compared to what we'll fetch using
481  * this method of groping around in the BIOS data.
482  *
483  * Returns 0 on success, nonzero on failure.
484  */
485 bool
486 intel_init_bios(struct drm_device *dev)
487 {
488         struct drm_i915_private *dev_priv = dev->dev_private;
489         struct pci_dev *pdev = dev->pdev;
490         struct vbt_header *vbt = NULL;
491         struct bdb_header *bdb;
492         u8 __iomem *bios;
493         size_t size;
494         int i;
495
496         bios = pci_map_rom(pdev, &size);
497         if (!bios)
498                 return -1;
499
500         /* Scour memory looking for the VBT signature */
501         for (i = 0; i + 4 < size; i++) {
502                 if (!memcmp(bios + i, "$VBT", 4)) {
503                         vbt = (struct vbt_header *)(bios + i);
504                         break;
505                 }
506         }
507
508         if (!vbt) {
509                 DRM_ERROR("VBT signature missing\n");
510                 pci_unmap_rom(pdev, bios);
511                 return -1;
512         }
513
514         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
515
516         /* Grab useful general definitions */
517         parse_general_features(dev_priv, bdb);
518         parse_general_definitions(dev_priv, bdb);
519         parse_lfp_panel_data(dev_priv, bdb);
520         parse_sdvo_panel_data(dev_priv, bdb);
521         parse_sdvo_device_mapping(dev_priv, bdb);
522         parse_device_mapping(dev_priv, bdb);
523         parse_driver_features(dev_priv, bdb);
524
525         pci_unmap_rom(pdev, bios);
526
527         return 0;
528 }