x86/PCI: truncate _CRS windows with _LEN > _MAX - _MIN + 1
[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 int panel_type;
37
38 static void *
39 find_section(struct bdb_header *bdb, int section_id)
40 {
41         u8 *base = (u8 *)bdb;
42         int index = 0;
43         u16 total, current_size;
44         u8 current_id;
45
46         /* skip to first section */
47         index += bdb->header_size;
48         total = bdb->bdb_size;
49
50         /* walk the sections looking for section_id */
51         while (index < total) {
52                 current_id = *(base + index);
53                 index++;
54                 current_size = *((u16 *)(base + index));
55                 index += 2;
56                 if (current_id == section_id)
57                         return base + index;
58                 index += current_size;
59         }
60
61         return NULL;
62 }
63
64 static u16
65 get_blocksize(void *p)
66 {
67         u16 *block_ptr, block_size;
68
69         block_ptr = (u16 *)((char *)p - 2);
70         block_size = *block_ptr;
71         return block_size;
72 }
73
74 static void
75 fill_detail_timing_data(struct drm_display_mode *panel_fixed_mode,
76                         struct lvds_dvo_timing *dvo_timing)
77 {
78         panel_fixed_mode->hdisplay = (dvo_timing->hactive_hi << 8) |
79                 dvo_timing->hactive_lo;
80         panel_fixed_mode->hsync_start = panel_fixed_mode->hdisplay +
81                 ((dvo_timing->hsync_off_hi << 8) | dvo_timing->hsync_off_lo);
82         panel_fixed_mode->hsync_end = panel_fixed_mode->hsync_start +
83                 dvo_timing->hsync_pulse_width;
84         panel_fixed_mode->htotal = panel_fixed_mode->hdisplay +
85                 ((dvo_timing->hblank_hi << 8) | dvo_timing->hblank_lo);
86
87         panel_fixed_mode->vdisplay = (dvo_timing->vactive_hi << 8) |
88                 dvo_timing->vactive_lo;
89         panel_fixed_mode->vsync_start = panel_fixed_mode->vdisplay +
90                 dvo_timing->vsync_off;
91         panel_fixed_mode->vsync_end = panel_fixed_mode->vsync_start +
92                 dvo_timing->vsync_pulse_width;
93         panel_fixed_mode->vtotal = panel_fixed_mode->vdisplay +
94                 ((dvo_timing->vblank_hi << 8) | dvo_timing->vblank_lo);
95         panel_fixed_mode->clock = dvo_timing->clock * 10;
96         panel_fixed_mode->type = DRM_MODE_TYPE_PREFERRED;
97
98         /* Some VBTs have bogus h/vtotal values */
99         if (panel_fixed_mode->hsync_end > panel_fixed_mode->htotal)
100                 panel_fixed_mode->htotal = panel_fixed_mode->hsync_end + 1;
101         if (panel_fixed_mode->vsync_end > panel_fixed_mode->vtotal)
102                 panel_fixed_mode->vtotal = panel_fixed_mode->vsync_end + 1;
103
104         drm_mode_set_name(panel_fixed_mode);
105 }
106
107 /* Try to find integrated panel data */
108 static void
109 parse_lfp_panel_data(struct drm_i915_private *dev_priv,
110                             struct bdb_header *bdb)
111 {
112         struct bdb_lvds_options *lvds_options;
113         struct bdb_lvds_lfp_data *lvds_lfp_data;
114         struct bdb_lvds_lfp_data_ptrs *lvds_lfp_data_ptrs;
115         struct bdb_lvds_lfp_data_entry *entry;
116         struct lvds_dvo_timing *dvo_timing;
117         struct drm_display_mode *panel_fixed_mode;
118         int lfp_data_size, dvo_timing_offset;
119         int i, temp_downclock;
120         struct drm_display_mode *temp_mode;
121
122         /* Defaults if we can't find VBT info */
123         dev_priv->lvds_dither = 0;
124         dev_priv->lvds_vbt = 0;
125
126         lvds_options = find_section(bdb, BDB_LVDS_OPTIONS);
127         if (!lvds_options)
128                 return;
129
130         dev_priv->lvds_dither = lvds_options->pixel_dither;
131         if (lvds_options->panel_type == 0xff)
132                 return;
133         panel_type = lvds_options->panel_type;
134
135         lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
136         if (!lvds_lfp_data)
137                 return;
138
139         lvds_lfp_data_ptrs = find_section(bdb, BDB_LVDS_LFP_DATA_PTRS);
140         if (!lvds_lfp_data_ptrs)
141                 return;
142
143         dev_priv->lvds_vbt = 1;
144
145         lfp_data_size = lvds_lfp_data_ptrs->ptr[1].dvo_timing_offset -
146                 lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset;
147         entry = (struct bdb_lvds_lfp_data_entry *)
148                 ((uint8_t *)lvds_lfp_data->data + (lfp_data_size *
149                                                    lvds_options->panel_type));
150         dvo_timing_offset = lvds_lfp_data_ptrs->ptr[0].dvo_timing_offset -
151                 lvds_lfp_data_ptrs->ptr[0].fp_timing_offset;
152
153         /*
154          * the size of fp_timing varies on the different platform.
155          * So calculate the DVO timing relative offset in LVDS data
156          * entry to get the DVO timing entry
157          */
158         dvo_timing = (struct lvds_dvo_timing *)
159                         ((unsigned char *)entry + dvo_timing_offset);
160
161         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
162
163         fill_detail_timing_data(panel_fixed_mode, dvo_timing);
164
165         dev_priv->lfp_lvds_vbt_mode = panel_fixed_mode;
166
167         DRM_DEBUG_KMS("Found panel mode in BIOS VBT tables:\n");
168         drm_mode_debug_printmodeline(panel_fixed_mode);
169
170         temp_mode = kzalloc(sizeof(*temp_mode), GFP_KERNEL);
171         temp_downclock = panel_fixed_mode->clock;
172         /*
173          * enumerate the LVDS panel timing info entry in VBT to check whether
174          * the LVDS downclock is found.
175          */
176         for (i = 0; i < 16; i++) {
177                 entry = (struct bdb_lvds_lfp_data_entry *)
178                         ((uint8_t *)lvds_lfp_data->data + (lfp_data_size * i));
179                 dvo_timing = (struct lvds_dvo_timing *)
180                         ((unsigned char *)entry + dvo_timing_offset);
181
182                 fill_detail_timing_data(temp_mode, dvo_timing);
183
184                 if (temp_mode->hdisplay == panel_fixed_mode->hdisplay &&
185                 temp_mode->hsync_start == panel_fixed_mode->hsync_start &&
186                 temp_mode->hsync_end == panel_fixed_mode->hsync_end &&
187                 temp_mode->htotal == panel_fixed_mode->htotal &&
188                 temp_mode->vdisplay == panel_fixed_mode->vdisplay &&
189                 temp_mode->vsync_start == panel_fixed_mode->vsync_start &&
190                 temp_mode->vsync_end == panel_fixed_mode->vsync_end &&
191                 temp_mode->vtotal == panel_fixed_mode->vtotal &&
192                 temp_mode->clock < temp_downclock) {
193                         /*
194                          * downclock is already found. But we expect
195                          * to find the lower downclock.
196                          */
197                         temp_downclock = temp_mode->clock;
198                 }
199                 /* clear it to zero */
200                 memset(temp_mode, 0, sizeof(*temp_mode));
201         }
202         kfree(temp_mode);
203         if (temp_downclock < panel_fixed_mode->clock &&
204             i915_lvds_downclock) {
205                 dev_priv->lvds_downclock_avail = 1;
206                 dev_priv->lvds_downclock = temp_downclock;
207                 DRM_DEBUG_KMS("LVDS downclock is found in VBT. ",
208                                 "Normal Clock %dKHz, downclock %dKHz\n",
209                                 temp_downclock, panel_fixed_mode->clock);
210         }
211         return;
212 }
213
214 /* Try to find sdvo panel data */
215 static void
216 parse_sdvo_panel_data(struct drm_i915_private *dev_priv,
217                       struct bdb_header *bdb)
218 {
219         struct bdb_sdvo_lvds_options *sdvo_lvds_options;
220         struct lvds_dvo_timing *dvo_timing;
221         struct drm_display_mode *panel_fixed_mode;
222
223         dev_priv->sdvo_lvds_vbt_mode = NULL;
224
225         sdvo_lvds_options = find_section(bdb, BDB_SDVO_LVDS_OPTIONS);
226         if (!sdvo_lvds_options)
227                 return;
228
229         dvo_timing = find_section(bdb, BDB_SDVO_PANEL_DTDS);
230         if (!dvo_timing)
231                 return;
232
233         panel_fixed_mode = kzalloc(sizeof(*panel_fixed_mode), GFP_KERNEL);
234
235         if (!panel_fixed_mode)
236                 return;
237
238         fill_detail_timing_data(panel_fixed_mode,
239                         dvo_timing + sdvo_lvds_options->panel_type);
240
241         dev_priv->sdvo_lvds_vbt_mode = panel_fixed_mode;
242
243         return;
244 }
245
246 static void
247 parse_general_features(struct drm_i915_private *dev_priv,
248                        struct bdb_header *bdb)
249 {
250         struct drm_device *dev = dev_priv->dev;
251         struct bdb_general_features *general;
252
253         /* Set sensible defaults in case we can't find the general block */
254         dev_priv->int_tv_support = 1;
255         dev_priv->int_crt_support = 1;
256
257         general = find_section(bdb, BDB_GENERAL_FEATURES);
258         if (general) {
259                 dev_priv->int_tv_support = general->int_tv_support;
260                 dev_priv->int_crt_support = general->int_crt_support;
261                 dev_priv->lvds_use_ssc = general->enable_ssc;
262
263                 if (dev_priv->lvds_use_ssc) {
264                         if (IS_I85X(dev_priv->dev))
265                                 dev_priv->lvds_ssc_freq =
266                                         general->ssc_freq ? 66 : 48;
267                         else if (IS_IRONLAKE(dev_priv->dev) || IS_GEN6(dev))
268                                 dev_priv->lvds_ssc_freq =
269                                         general->ssc_freq ? 100 : 120;
270                         else
271                                 dev_priv->lvds_ssc_freq =
272                                         general->ssc_freq ? 100 : 96;
273                 }
274         }
275 }
276
277 static void
278 parse_general_definitions(struct drm_i915_private *dev_priv,
279                           struct bdb_header *bdb)
280 {
281         struct bdb_general_definitions *general;
282         const int crt_bus_map_table[] = {
283                 GPIOB,
284                 GPIOA,
285                 GPIOC,
286                 GPIOD,
287                 GPIOE,
288                 GPIOF,
289         };
290
291         general = find_section(bdb, BDB_GENERAL_DEFINITIONS);
292         if (general) {
293                 u16 block_size = get_blocksize(general);
294                 if (block_size >= sizeof(*general)) {
295                         int bus_pin = general->crt_ddc_gmbus_pin;
296                         DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
297                         if ((bus_pin >= 1) && (bus_pin <= 6)) {
298                                 dev_priv->crt_ddc_bus =
299                                         crt_bus_map_table[bus_pin-1];
300                         }
301                 } else {
302                         DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
303                                   block_size);
304                 }
305         }
306 }
307
308 static void
309 parse_sdvo_device_mapping(struct drm_i915_private *dev_priv,
310                        struct bdb_header *bdb)
311 {
312         struct sdvo_device_mapping *p_mapping;
313         struct bdb_general_definitions *p_defs;
314         struct child_device_config *p_child;
315         int i, child_device_num, count;
316         u16     block_size;
317
318         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
319         if (!p_defs) {
320                 DRM_DEBUG_KMS("No general definition block is found\n");
321                 return;
322         }
323         /* judge whether the size of child device meets the requirements.
324          * If the child device size obtained from general definition block
325          * is different with sizeof(struct child_device_config), skip the
326          * parsing of sdvo device info
327          */
328         if (p_defs->child_dev_size != sizeof(*p_child)) {
329                 /* different child dev size . Ignore it */
330                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
331                 return;
332         }
333         /* get the block size of general definitions */
334         block_size = get_blocksize(p_defs);
335         /* get the number of child device */
336         child_device_num = (block_size - sizeof(*p_defs)) /
337                                 sizeof(*p_child);
338         count = 0;
339         for (i = 0; i < child_device_num; i++) {
340                 p_child = &(p_defs->devices[i]);
341                 if (!p_child->device_type) {
342                         /* skip the device block if device type is invalid */
343                         continue;
344                 }
345                 if (p_child->slave_addr != SLAVE_ADDR1 &&
346                         p_child->slave_addr != SLAVE_ADDR2) {
347                         /*
348                          * If the slave address is neither 0x70 nor 0x72,
349                          * it is not a SDVO device. Skip it.
350                          */
351                         continue;
352                 }
353                 if (p_child->dvo_port != DEVICE_PORT_DVOB &&
354                         p_child->dvo_port != DEVICE_PORT_DVOC) {
355                         /* skip the incorrect SDVO port */
356                         DRM_DEBUG_KMS("Incorrect SDVO port. Skip it \n");
357                         continue;
358                 }
359                 DRM_DEBUG_KMS("the SDVO device with slave addr %2x is found on"
360                                 " %s port\n",
361                                 p_child->slave_addr,
362                                 (p_child->dvo_port == DEVICE_PORT_DVOB) ?
363                                         "SDVOB" : "SDVOC");
364                 p_mapping = &(dev_priv->sdvo_mappings[p_child->dvo_port - 1]);
365                 if (!p_mapping->initialized) {
366                         p_mapping->dvo_port = p_child->dvo_port;
367                         p_mapping->slave_addr = p_child->slave_addr;
368                         p_mapping->dvo_wiring = p_child->dvo_wiring;
369                         p_mapping->initialized = 1;
370                 } else {
371                         DRM_DEBUG_KMS("Maybe one SDVO port is shared by "
372                                          "two SDVO device.\n");
373                 }
374                 if (p_child->slave2_addr) {
375                         /* Maybe this is a SDVO device with multiple inputs */
376                         /* And the mapping info is not added */
377                         DRM_DEBUG_KMS("there exists the slave2_addr. Maybe this"
378                                 " is a SDVO device with multiple inputs.\n");
379                 }
380                 count++;
381         }
382
383         if (!count) {
384                 /* No SDVO device info is found */
385                 DRM_DEBUG_KMS("No SDVO device info is found in VBT\n");
386         }
387         return;
388 }
389
390 static void
391 parse_driver_features(struct drm_i915_private *dev_priv,
392                        struct bdb_header *bdb)
393 {
394         struct drm_device *dev = dev_priv->dev;
395         struct bdb_driver_features *driver;
396
397         driver = find_section(bdb, BDB_DRIVER_FEATURES);
398         if (!driver)
399                 return;
400
401         if (driver && SUPPORTS_EDP(dev) &&
402             driver->lvds_config == BDB_DRIVER_FEATURE_EDP) {
403                 dev_priv->edp_support = 1;
404         } else {
405                 dev_priv->edp_support = 0;
406         }
407
408         if (driver && driver->dual_frequency)
409                 dev_priv->render_reclock_avail = true;
410 }
411
412 static void
413 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
414 {
415         struct bdb_edp *edp;
416
417         edp = find_section(bdb, BDB_EDP);
418         if (!edp) {
419                 if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp_support) {
420                         DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported,\
421                                        assume 18bpp panel color depth.\n");
422                         dev_priv->edp_bpp = 18;
423                 }
424                 return;
425         }
426
427         switch ((edp->color_depth >> (panel_type * 2)) & 3) {
428         case EDP_18BPP:
429                 dev_priv->edp_bpp = 18;
430                 break;
431         case EDP_24BPP:
432                 dev_priv->edp_bpp = 24;
433                 break;
434         case EDP_30BPP:
435                 dev_priv->edp_bpp = 30;
436                 break;
437         }
438 }
439
440 static void
441 parse_device_mapping(struct drm_i915_private *dev_priv,
442                        struct bdb_header *bdb)
443 {
444         struct bdb_general_definitions *p_defs;
445         struct child_device_config *p_child, *child_dev_ptr;
446         int i, child_device_num, count;
447         u16     block_size;
448
449         p_defs = find_section(bdb, BDB_GENERAL_DEFINITIONS);
450         if (!p_defs) {
451                 DRM_DEBUG_KMS("No general definition block is found\n");
452                 return;
453         }
454         /* judge whether the size of child device meets the requirements.
455          * If the child device size obtained from general definition block
456          * is different with sizeof(struct child_device_config), skip the
457          * parsing of sdvo device info
458          */
459         if (p_defs->child_dev_size != sizeof(*p_child)) {
460                 /* different child dev size . Ignore it */
461                 DRM_DEBUG_KMS("different child size is found. Invalid.\n");
462                 return;
463         }
464         /* get the block size of general definitions */
465         block_size = get_blocksize(p_defs);
466         /* get the number of child device */
467         child_device_num = (block_size - sizeof(*p_defs)) /
468                                 sizeof(*p_child);
469         count = 0;
470         /* get the number of child device that is present */
471         for (i = 0; i < child_device_num; i++) {
472                 p_child = &(p_defs->devices[i]);
473                 if (!p_child->device_type) {
474                         /* skip the device block if device type is invalid */
475                         continue;
476                 }
477                 count++;
478         }
479         if (!count) {
480                 DRM_DEBUG_KMS("no child dev is parsed from VBT \n");
481                 return;
482         }
483         dev_priv->child_dev = kzalloc(sizeof(*p_child) * count, GFP_KERNEL);
484         if (!dev_priv->child_dev) {
485                 DRM_DEBUG_KMS("No memory space for child device\n");
486                 return;
487         }
488
489         dev_priv->child_dev_num = count;
490         count = 0;
491         for (i = 0; i < child_device_num; i++) {
492                 p_child = &(p_defs->devices[i]);
493                 if (!p_child->device_type) {
494                         /* skip the device block if device type is invalid */
495                         continue;
496                 }
497                 child_dev_ptr = dev_priv->child_dev + count;
498                 count++;
499                 memcpy((void *)child_dev_ptr, (void *)p_child,
500                                         sizeof(*p_child));
501         }
502         return;
503 }
504 /**
505  * intel_init_bios - initialize VBIOS settings & find VBT
506  * @dev: DRM device
507  *
508  * Loads the Video BIOS and checks that the VBT exists.  Sets scratch registers
509  * to appropriate values.
510  *
511  * VBT existence is a sanity check that is relied on by other i830_bios.c code.
512  * Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
513  * feed an updated VBT back through that, compared to what we'll fetch using
514  * this method of groping around in the BIOS data.
515  *
516  * Returns 0 on success, nonzero on failure.
517  */
518 bool
519 intel_init_bios(struct drm_device *dev)
520 {
521         struct drm_i915_private *dev_priv = dev->dev_private;
522         struct pci_dev *pdev = dev->pdev;
523         struct vbt_header *vbt = NULL;
524         struct bdb_header *bdb;
525         u8 __iomem *bios;
526         size_t size;
527         int i;
528
529         bios = pci_map_rom(pdev, &size);
530         if (!bios)
531                 return -1;
532
533         /* Scour memory looking for the VBT signature */
534         for (i = 0; i + 4 < size; i++) {
535                 if (!memcmp(bios + i, "$VBT", 4)) {
536                         vbt = (struct vbt_header *)(bios + i);
537                         break;
538                 }
539         }
540
541         if (!vbt) {
542                 DRM_ERROR("VBT signature missing\n");
543                 pci_unmap_rom(pdev, bios);
544                 return -1;
545         }
546
547         bdb = (struct bdb_header *)(bios + i + vbt->bdb_offset);
548
549         /* Grab useful general definitions */
550         parse_general_features(dev_priv, bdb);
551         parse_general_definitions(dev_priv, bdb);
552         parse_lfp_panel_data(dev_priv, bdb);
553         parse_sdvo_panel_data(dev_priv, bdb);
554         parse_sdvo_device_mapping(dev_priv, bdb);
555         parse_device_mapping(dev_priv, bdb);
556         parse_driver_features(dev_priv, bdb);
557         parse_edp(dev_priv, bdb);
558
559         pci_unmap_rom(pdev, bios);
560
561         return 0;
562 }