f8779d4750ba63f98908492f2b11b9bfe7cf4ea8
[linux-3.10.git] / drivers / video / omap2 / dss / core.c
1 /*
2  * linux/drivers/video/omap2/dss/core.c
3  *
4  * Copyright (C) 2009 Nokia Corporation
5  * Author: Tomi Valkeinen <tomi.valkeinen@nokia.com>
6  *
7  * Some code and ideas taken from drivers/video/omap/ driver
8  * by Imre Deak.
9  *
10  * This program is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU General Public License version 2 as published by
12  * the Free Software Foundation.
13  *
14  * This program is distributed in the hope that it will be useful, but WITHOUT
15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
17  * more details.
18  *
19  * You should have received a copy of the GNU General Public License along with
20  * this program.  If not, see <http://www.gnu.org/licenses/>.
21  */
22
23 #define DSS_SUBSYS_NAME "CORE"
24
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/clk.h>
28 #include <linux/err.h>
29 #include <linux/platform_device.h>
30 #include <linux/seq_file.h>
31 #include <linux/debugfs.h>
32 #include <linux/io.h>
33 #include <linux/device.h>
34 #include <linux/regulator/consumer.h>
35 #include <linux/suspend.h>
36 #include <linux/slab.h>
37
38 #include <video/omapdss.h>
39
40 #include "dss.h"
41 #include "dss_features.h"
42
43 static struct {
44         struct platform_device *pdev;
45
46         struct regulator *vdds_dsi_reg;
47         struct regulator *vdds_sdi_reg;
48
49         const char *default_display_name;
50 } core;
51
52 static char *def_disp_name;
53 module_param_named(def_disp, def_disp_name, charp, 0);
54 MODULE_PARM_DESC(def_disp, "default display name");
55
56 const char *omapdss_get_default_display_name(void)
57 {
58         return core.default_display_name;
59 }
60 EXPORT_SYMBOL(omapdss_get_default_display_name);
61
62 enum omapdss_version omapdss_get_version(void)
63 {
64         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
65         return pdata->version;
66 }
67 EXPORT_SYMBOL(omapdss_get_version);
68
69 struct platform_device *dss_get_core_pdev(void)
70 {
71         return core.pdev;
72 }
73
74 /* REGULATORS */
75
76 struct regulator *dss_get_vdds_dsi(void)
77 {
78         struct regulator *reg;
79
80         if (core.vdds_dsi_reg != NULL)
81                 return core.vdds_dsi_reg;
82
83         reg = regulator_get(&core.pdev->dev, "vdds_dsi");
84         if (!IS_ERR(reg))
85                 core.vdds_dsi_reg = reg;
86
87         return reg;
88 }
89
90 struct regulator *dss_get_vdds_sdi(void)
91 {
92         struct regulator *reg;
93
94         if (core.vdds_sdi_reg != NULL)
95                 return core.vdds_sdi_reg;
96
97         reg = regulator_get(&core.pdev->dev, "vdds_sdi");
98         if (!IS_ERR(reg))
99                 core.vdds_sdi_reg = reg;
100
101         return reg;
102 }
103
104 int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
105 {
106         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
107
108         if (!board_data->dsi_enable_pads)
109                 return -ENOENT;
110
111         return board_data->dsi_enable_pads(dsi_id, lane_mask);
112 }
113
114 void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
115 {
116         struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
117
118         if (!board_data->dsi_disable_pads)
119                 return;
120
121         return board_data->dsi_disable_pads(dsi_id, lane_mask);
122 }
123
124 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
125 {
126         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
127
128         if (pdata->set_min_bus_tput)
129                 return pdata->set_min_bus_tput(dev, tput);
130         else
131                 return 0;
132 }
133
134 #if defined(CONFIG_OMAP2_DSS_DEBUGFS)
135 static int dss_debug_show(struct seq_file *s, void *unused)
136 {
137         void (*func)(struct seq_file *) = s->private;
138         func(s);
139         return 0;
140 }
141
142 static int dss_debug_open(struct inode *inode, struct file *file)
143 {
144         return single_open(file, dss_debug_show, inode->i_private);
145 }
146
147 static const struct file_operations dss_debug_fops = {
148         .open           = dss_debug_open,
149         .read           = seq_read,
150         .llseek         = seq_lseek,
151         .release        = single_release,
152 };
153
154 static struct dentry *dss_debugfs_dir;
155
156 static int dss_initialize_debugfs(void)
157 {
158         dss_debugfs_dir = debugfs_create_dir("omapdss", NULL);
159         if (IS_ERR(dss_debugfs_dir)) {
160                 int err = PTR_ERR(dss_debugfs_dir);
161                 dss_debugfs_dir = NULL;
162                 return err;
163         }
164
165         debugfs_create_file("clk", S_IRUGO, dss_debugfs_dir,
166                         &dss_debug_dump_clocks, &dss_debug_fops);
167
168         return 0;
169 }
170
171 static void dss_uninitialize_debugfs(void)
172 {
173         if (dss_debugfs_dir)
174                 debugfs_remove_recursive(dss_debugfs_dir);
175 }
176
177 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
178 {
179         struct dentry *d;
180
181         d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
182                         write, &dss_debug_fops);
183
184         if (IS_ERR(d))
185                 return PTR_ERR(d);
186
187         return 0;
188 }
189 #else /* CONFIG_OMAP2_DSS_DEBUGFS */
190 static inline int dss_initialize_debugfs(void)
191 {
192         return 0;
193 }
194 static inline void dss_uninitialize_debugfs(void)
195 {
196 }
197 int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
198 {
199         return 0;
200 }
201 #endif /* CONFIG_OMAP2_DSS_DEBUGFS */
202
203 /* PLATFORM DEVICE */
204 static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
205 {
206         DSSDBG("pm notif %lu\n", v);
207
208         switch (v) {
209         case PM_SUSPEND_PREPARE:
210                 DSSDBG("suspending displays\n");
211                 return dss_suspend_all_devices();
212
213         case PM_POST_SUSPEND:
214                 DSSDBG("resuming displays\n");
215                 return dss_resume_all_devices();
216
217         default:
218                 return 0;
219         }
220 }
221
222 static struct notifier_block omap_dss_pm_notif_block = {
223         .notifier_call = omap_dss_pm_notif,
224 };
225
226 static int __init omap_dss_probe(struct platform_device *pdev)
227 {
228         struct omap_dss_board_info *pdata = pdev->dev.platform_data;
229         int r;
230
231         core.pdev = pdev;
232
233         dss_features_init(omapdss_get_version());
234
235         r = dss_initialize_debugfs();
236         if (r)
237                 goto err_debugfs;
238
239         if (def_disp_name)
240                 core.default_display_name = def_disp_name;
241         else if (pdata->default_device)
242                 core.default_display_name = pdata->default_device->name;
243
244         register_pm_notifier(&omap_dss_pm_notif_block);
245
246         return 0;
247
248 err_debugfs:
249
250         return r;
251 }
252
253 static int omap_dss_remove(struct platform_device *pdev)
254 {
255         unregister_pm_notifier(&omap_dss_pm_notif_block);
256
257         dss_uninitialize_debugfs();
258
259         return 0;
260 }
261
262 static void omap_dss_shutdown(struct platform_device *pdev)
263 {
264         DSSDBG("shutdown\n");
265         dss_disable_all_devices();
266 }
267
268 static struct platform_driver omap_dss_driver = {
269         .remove         = omap_dss_remove,
270         .shutdown       = omap_dss_shutdown,
271         .driver         = {
272                 .name   = "omapdss",
273                 .owner  = THIS_MODULE,
274         },
275 };
276
277 /* BUS */
278 static int dss_bus_match(struct device *dev, struct device_driver *driver)
279 {
280         struct omap_dss_device *dssdev = to_dss_device(dev);
281
282         DSSDBG("bus_match. dev %s/%s, drv %s\n",
283                         dev_name(dev), dssdev->driver_name, driver->name);
284
285         return strcmp(dssdev->driver_name, driver->name) == 0;
286 }
287
288 static ssize_t device_name_show(struct device *dev,
289                 struct device_attribute *attr, char *buf)
290 {
291         struct omap_dss_device *dssdev = to_dss_device(dev);
292         return snprintf(buf, PAGE_SIZE, "%s\n",
293                         dssdev->name ?
294                         dssdev->name : "");
295 }
296
297 static struct device_attribute default_dev_attrs[] = {
298         __ATTR(name, S_IRUGO, device_name_show, NULL),
299         __ATTR_NULL,
300 };
301
302 static ssize_t driver_name_show(struct device_driver *drv, char *buf)
303 {
304         struct omap_dss_driver *dssdrv = to_dss_driver(drv);
305         return snprintf(buf, PAGE_SIZE, "%s\n",
306                         dssdrv->driver.name ?
307                         dssdrv->driver.name : "");
308 }
309 static struct driver_attribute default_drv_attrs[] = {
310         __ATTR(name, S_IRUGO, driver_name_show, NULL),
311         __ATTR_NULL,
312 };
313
314 static struct bus_type dss_bus_type = {
315         .name = "omapdss",
316         .match = dss_bus_match,
317         .dev_attrs = default_dev_attrs,
318         .drv_attrs = default_drv_attrs,
319 };
320
321 static void dss_bus_release(struct device *dev)
322 {
323         DSSDBG("bus_release\n");
324 }
325
326 static struct device dss_bus = {
327         .release = dss_bus_release,
328 };
329
330 struct bus_type *dss_get_bus(void)
331 {
332         return &dss_bus_type;
333 }
334
335 /* DRIVER */
336 static int dss_driver_probe(struct device *dev)
337 {
338         int r;
339         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
340         struct omap_dss_device *dssdev = to_dss_device(dev);
341
342         DSSDBG("driver_probe: dev %s/%s, drv %s\n",
343                                 dev_name(dev), dssdev->driver_name,
344                                 dssdrv->driver.name);
345
346         r = dssdrv->probe(dssdev);
347
348         if (r) {
349                 DSSERR("driver probe failed: %d\n", r);
350                 return r;
351         }
352
353         DSSDBG("probe done for device %s\n", dev_name(dev));
354
355         dssdev->driver = dssdrv;
356
357         return 0;
358 }
359
360 static int dss_driver_remove(struct device *dev)
361 {
362         struct omap_dss_driver *dssdrv = to_dss_driver(dev->driver);
363         struct omap_dss_device *dssdev = to_dss_device(dev);
364
365         DSSDBG("driver_remove: dev %s/%s\n", dev_name(dev),
366                         dssdev->driver_name);
367
368         dssdrv->remove(dssdev);
369
370         dssdev->driver = NULL;
371
372         return 0;
373 }
374
375 int omap_dss_register_driver(struct omap_dss_driver *dssdriver)
376 {
377         dssdriver->driver.bus = &dss_bus_type;
378         dssdriver->driver.probe = dss_driver_probe;
379         dssdriver->driver.remove = dss_driver_remove;
380
381         if (dssdriver->get_resolution == NULL)
382                 dssdriver->get_resolution = omapdss_default_get_resolution;
383         if (dssdriver->get_recommended_bpp == NULL)
384                 dssdriver->get_recommended_bpp =
385                         omapdss_default_get_recommended_bpp;
386         if (dssdriver->get_timings == NULL)
387                 dssdriver->get_timings = omapdss_default_get_timings;
388
389         return driver_register(&dssdriver->driver);
390 }
391 EXPORT_SYMBOL(omap_dss_register_driver);
392
393 void omap_dss_unregister_driver(struct omap_dss_driver *dssdriver)
394 {
395         driver_unregister(&dssdriver->driver);
396 }
397 EXPORT_SYMBOL(omap_dss_unregister_driver);
398
399 /* DEVICE */
400
401 static void omap_dss_dev_release(struct device *dev)
402 {
403         struct omap_dss_device *dssdev = to_dss_device(dev);
404         kfree(dssdev);
405 }
406
407 static int disp_num_counter;
408
409 struct omap_dss_device *dss_alloc_and_init_device(struct device *parent)
410 {
411         struct omap_dss_device *dssdev;
412
413         dssdev = kzalloc(sizeof(*dssdev), GFP_KERNEL);
414         if (!dssdev)
415                 return NULL;
416
417         dssdev->dev.bus = &dss_bus_type;
418         dssdev->dev.parent = parent;
419         dssdev->dev.release = omap_dss_dev_release;
420         dev_set_name(&dssdev->dev, "display%d", disp_num_counter++);
421
422         device_initialize(&dssdev->dev);
423
424         return dssdev;
425 }
426
427 int dss_add_device(struct omap_dss_device *dssdev)
428 {
429         return device_add(&dssdev->dev);
430 }
431
432 void dss_put_device(struct omap_dss_device *dssdev)
433 {
434         put_device(&dssdev->dev);
435 }
436
437 void dss_unregister_device(struct omap_dss_device *dssdev)
438 {
439         device_unregister(&dssdev->dev);
440 }
441
442 static int dss_unregister_dss_dev(struct device *dev, void *data)
443 {
444         struct omap_dss_device *dssdev = to_dss_device(dev);
445         dss_unregister_device(dssdev);
446         return 0;
447 }
448
449 void dss_unregister_child_devices(struct device *parent)
450 {
451         device_for_each_child(parent, NULL, dss_unregister_dss_dev);
452 }
453
454 void dss_copy_device_pdata(struct omap_dss_device *dst,
455                 const struct omap_dss_device *src)
456 {
457         u8 *d = (u8 *)dst;
458         u8 *s = (u8 *)src;
459         size_t dsize = sizeof(struct device);
460
461         memcpy(d + dsize, s + dsize, sizeof(struct omap_dss_device) - dsize);
462 }
463
464 /* BUS */
465 static int __init omap_dss_bus_register(void)
466 {
467         int r;
468
469         r = bus_register(&dss_bus_type);
470         if (r) {
471                 DSSERR("bus register failed\n");
472                 return r;
473         }
474
475         dev_set_name(&dss_bus, "omapdss");
476         r = device_register(&dss_bus);
477         if (r) {
478                 DSSERR("bus driver register failed\n");
479                 bus_unregister(&dss_bus_type);
480                 return r;
481         }
482
483         return 0;
484 }
485
486 /* INIT */
487 static int (*dss_output_drv_reg_funcs[])(void) __initdata = {
488 #ifdef CONFIG_OMAP2_DSS_DSI
489         dsi_init_platform_driver,
490 #endif
491 #ifdef CONFIG_OMAP2_DSS_DPI
492         dpi_init_platform_driver,
493 #endif
494 #ifdef CONFIG_OMAP2_DSS_SDI
495         sdi_init_platform_driver,
496 #endif
497 #ifdef CONFIG_OMAP2_DSS_RFBI
498         rfbi_init_platform_driver,
499 #endif
500 #ifdef CONFIG_OMAP2_DSS_VENC
501         venc_init_platform_driver,
502 #endif
503 #ifdef CONFIG_OMAP4_DSS_HDMI
504         hdmi_init_platform_driver,
505 #endif
506 };
507
508 static void (*dss_output_drv_unreg_funcs[])(void) __exitdata = {
509 #ifdef CONFIG_OMAP2_DSS_DSI
510         dsi_uninit_platform_driver,
511 #endif
512 #ifdef CONFIG_OMAP2_DSS_DPI
513         dpi_uninit_platform_driver,
514 #endif
515 #ifdef CONFIG_OMAP2_DSS_SDI
516         sdi_uninit_platform_driver,
517 #endif
518 #ifdef CONFIG_OMAP2_DSS_RFBI
519         rfbi_uninit_platform_driver,
520 #endif
521 #ifdef CONFIG_OMAP2_DSS_VENC
522         venc_uninit_platform_driver,
523 #endif
524 #ifdef CONFIG_OMAP4_DSS_HDMI
525         hdmi_uninit_platform_driver,
526 #endif
527 };
528
529 static bool dss_output_drv_loaded[ARRAY_SIZE(dss_output_drv_reg_funcs)];
530
531 static int __init omap_dss_register_drivers(void)
532 {
533         int r;
534         int i;
535
536         r = platform_driver_probe(&omap_dss_driver, omap_dss_probe);
537         if (r)
538                 return r;
539
540         r = dss_init_platform_driver();
541         if (r) {
542                 DSSERR("Failed to initialize DSS platform driver\n");
543                 goto err_dss;
544         }
545
546         r = dispc_init_platform_driver();
547         if (r) {
548                 DSSERR("Failed to initialize dispc platform driver\n");
549                 goto err_dispc;
550         }
551
552         /*
553          * It's ok if the output-driver register fails. It happens, for example,
554          * when there is no output-device (e.g. SDI for OMAP4).
555          */
556         for (i = 0; i < ARRAY_SIZE(dss_output_drv_reg_funcs); ++i) {
557                 r = dss_output_drv_reg_funcs[i]();
558                 if (r == 0)
559                         dss_output_drv_loaded[i] = true;
560         }
561
562         return 0;
563
564 err_dispc:
565         dss_uninit_platform_driver();
566 err_dss:
567         platform_driver_unregister(&omap_dss_driver);
568
569         return r;
570 }
571
572 static void __exit omap_dss_unregister_drivers(void)
573 {
574         int i;
575
576         for (i = 0; i < ARRAY_SIZE(dss_output_drv_unreg_funcs); ++i) {
577                 if (dss_output_drv_loaded[i])
578                         dss_output_drv_unreg_funcs[i]();
579         }
580
581         dispc_uninit_platform_driver();
582         dss_uninit_platform_driver();
583
584         platform_driver_unregister(&omap_dss_driver);
585 }
586
587 #ifdef CONFIG_OMAP2_DSS_MODULE
588 static void omap_dss_bus_unregister(void)
589 {
590         device_unregister(&dss_bus);
591
592         bus_unregister(&dss_bus_type);
593 }
594
595 static int __init omap_dss_init(void)
596 {
597         int r;
598
599         r = omap_dss_bus_register();
600         if (r)
601                 return r;
602
603         r = omap_dss_register_drivers();
604         if (r) {
605                 omap_dss_bus_unregister();
606                 return r;
607         }
608
609         return 0;
610 }
611
612 static void __exit omap_dss_exit(void)
613 {
614         if (core.vdds_dsi_reg != NULL) {
615                 regulator_put(core.vdds_dsi_reg);
616                 core.vdds_dsi_reg = NULL;
617         }
618
619         if (core.vdds_sdi_reg != NULL) {
620                 regulator_put(core.vdds_sdi_reg);
621                 core.vdds_sdi_reg = NULL;
622         }
623
624         omap_dss_unregister_drivers();
625
626         omap_dss_bus_unregister();
627 }
628
629 module_init(omap_dss_init);
630 module_exit(omap_dss_exit);
631 #else
632 static int __init omap_dss_init(void)
633 {
634         return omap_dss_bus_register();
635 }
636
637 static int __init omap_dss_init2(void)
638 {
639         return omap_dss_register_drivers();
640 }
641
642 core_initcall(omap_dss_init);
643 device_initcall(omap_dss_init2);
644 #endif
645
646 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
647 MODULE_DESCRIPTION("OMAP2/3 Display Subsystem");
648 MODULE_LICENSE("GPL v2");
649