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1/* exynos_drm_vidi.c
2 *
3 * Copyright (C) 2012 Samsung Electronics Co.Ltd
4 * Authors:
5 * Inki Dae <inki.dae@samsung.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 */
13#include "drmP.h"
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18
19#include <drm/exynos_drm.h>
20
21#include "drm_edid.h"
22#include "drm_crtc_helper.h"
23
24#include "exynos_drm_drv.h"
25#include "exynos_drm_crtc.h"
26#include "exynos_drm_encoder.h"
27
28/* vidi has totally three virtual windows. */
29#define WINDOWS_NR 3
30
31#define get_vidi_context(dev) platform_get_drvdata(to_platform_device(dev))
32
33struct vidi_win_data {
34 unsigned int offset_x;
35 unsigned int offset_y;
36 unsigned int ovl_width;
37 unsigned int ovl_height;
38 unsigned int fb_width;
39 unsigned int fb_height;
40 unsigned int bpp;
41 dma_addr_t dma_addr;
42 void __iomem *vaddr;
43 unsigned int buf_offsize;
44 unsigned int line_size; /* bytes */
45 bool enabled;
46};
47
48struct vidi_context {
49 struct exynos_drm_subdrv subdrv;
50 struct drm_crtc *crtc;
51 struct vidi_win_data win_data[WINDOWS_NR];
52 struct edid *raw_edid;
53 unsigned int clkdiv;
54 unsigned int default_win;
55 unsigned long irq_flags;
56 unsigned int connected;
57 bool vblank_on;
58 bool suspended;
59 struct work_struct work;
60 struct mutex lock;
61};
62
63static const char fake_edid_info[] = {
64 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x4c, 0x2d, 0x05, 0x05,
65 0x00, 0x00, 0x00, 0x00, 0x30, 0x12, 0x01, 0x03, 0x80, 0x10, 0x09, 0x78,
66 0x0a, 0xee, 0x91, 0xa3, 0x54, 0x4c, 0x99, 0x26, 0x0f, 0x50, 0x54, 0xbd,
67 0xee, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
68 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x66, 0x21, 0x50, 0xb0, 0x51, 0x00,
69 0x1b, 0x30, 0x40, 0x70, 0x36, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e,
70 0x01, 0x1d, 0x00, 0x72, 0x51, 0xd0, 0x1e, 0x20, 0x6e, 0x28, 0x55, 0x00,
71 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0xfd, 0x00, 0x18,
72 0x4b, 0x1a, 0x44, 0x17, 0x00, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
73 0x00, 0x00, 0x00, 0xfc, 0x00, 0x53, 0x41, 0x4d, 0x53, 0x55, 0x4e, 0x47,
74 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0xbc, 0x02, 0x03, 0x1e, 0xf1,
75 0x46, 0x84, 0x05, 0x03, 0x10, 0x20, 0x22, 0x23, 0x09, 0x07, 0x07, 0x83,
76 0x01, 0x00, 0x00, 0xe2, 0x00, 0x0f, 0x67, 0x03, 0x0c, 0x00, 0x10, 0x00,
77 0xb8, 0x2d, 0x01, 0x1d, 0x80, 0x18, 0x71, 0x1c, 0x16, 0x20, 0x58, 0x2c,
78 0x25, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x9e, 0x8c, 0x0a, 0xd0, 0x8a,
79 0x20, 0xe0, 0x2d, 0x10, 0x10, 0x3e, 0x96, 0x00, 0xa0, 0x5a, 0x00, 0x00,
80 0x00, 0x18, 0x02, 0x3a, 0x80, 0x18, 0x71, 0x38, 0x2d, 0x40, 0x58, 0x2c,
81 0x45, 0x00, 0xa0, 0x5a, 0x00, 0x00, 0x00, 0x1e, 0x00, 0x00, 0x00, 0x00,
82 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
83 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
84 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
85 0x00, 0x00, 0x00, 0x06
86};
87
88static void vidi_fake_vblank_handler(struct work_struct *work);
89
90static bool vidi_display_is_connected(struct device *dev)
91{
92 struct vidi_context *ctx = get_vidi_context(dev);
93
94 DRM_DEBUG_KMS("%s\n", __FILE__);
95
96 /*
97 * connection request would come from user side
98 * to do hotplug through specific ioctl.
99 */
100 return ctx->connected ? true : false;
101}
102
103static int vidi_get_edid(struct device *dev, struct drm_connector *connector,
104 u8 *edid, int len)
105{
106 struct vidi_context *ctx = get_vidi_context(dev);
107 struct edid *raw_edid;
108
109 DRM_DEBUG_KMS("%s\n", __FILE__);
110
111 /*
112 * the edid data comes from user side and it would be set
113 * to ctx->raw_edid through specific ioctl.
114 */
115 if (!ctx->raw_edid) {
116 DRM_DEBUG_KMS("raw_edid is null.\n");
117 return -EFAULT;
118 }
119
120 raw_edid = kzalloc(len, GFP_KERNEL);
121 if (!raw_edid) {
122 DRM_DEBUG_KMS("failed to allocate raw_edid.\n");
123 return -ENOMEM;
124 }
125
126 memcpy(raw_edid, ctx->raw_edid, min((1 + ctx->raw_edid->extensions)
127 * EDID_LENGTH, len));
128
129 /* attach the edid data to connector. */
130 connector->display_info.raw_edid = (char *)raw_edid;
131
132 memcpy(edid, ctx->raw_edid, min((1 + ctx->raw_edid->extensions)
133 * EDID_LENGTH, len));
134
135 return 0;
136}
137
138static void *vidi_get_panel(struct device *dev)
139{
140 DRM_DEBUG_KMS("%s\n", __FILE__);
141
142 /* TODO. */
143
144 return NULL;
145}
146
147static int vidi_check_timing(struct device *dev, void *timing)
148{
149 DRM_DEBUG_KMS("%s\n", __FILE__);
150
151 /* TODO. */
152
153 return 0;
154}
155
156static int vidi_display_power_on(struct device *dev, int mode)
157{
158 DRM_DEBUG_KMS("%s\n", __FILE__);
159
160 /* TODO */
161
162 return 0;
163}
164
165static struct exynos_drm_display_ops vidi_display_ops = {
166 .type = EXYNOS_DISPLAY_TYPE_VIDI,
167 .is_connected = vidi_display_is_connected,
168 .get_edid = vidi_get_edid,
169 .get_panel = vidi_get_panel,
170 .check_timing = vidi_check_timing,
171 .power_on = vidi_display_power_on,
172};
173
174static void vidi_dpms(struct device *subdrv_dev, int mode)
175{
176 struct vidi_context *ctx = get_vidi_context(subdrv_dev);
177
178 DRM_DEBUG_KMS("%s, %d\n", __FILE__, mode);
179
180 mutex_lock(&ctx->lock);
181
182 switch (mode) {
183 case DRM_MODE_DPMS_ON:
184 /* TODO. */
185 break;
186 case DRM_MODE_DPMS_STANDBY:
187 case DRM_MODE_DPMS_SUSPEND:
188 case DRM_MODE_DPMS_OFF:
189 /* TODO. */
190 break;
191 default:
192 DRM_DEBUG_KMS("unspecified mode %d\n", mode);
193 break;
194 }
195
196 mutex_unlock(&ctx->lock);
197}
198
199static void vidi_apply(struct device *subdrv_dev)
200{
201 struct vidi_context *ctx = get_vidi_context(subdrv_dev);
202 struct exynos_drm_manager *mgr = ctx->subdrv.manager;
203 struct exynos_drm_manager_ops *mgr_ops = mgr->ops;
204 struct exynos_drm_overlay_ops *ovl_ops = mgr->overlay_ops;
205 struct vidi_win_data *win_data;
206 int i;
207
208 DRM_DEBUG_KMS("%s\n", __FILE__);
209
210 for (i = 0; i < WINDOWS_NR; i++) {
211 win_data = &ctx->win_data[i];
212 if (win_data->enabled && (ovl_ops && ovl_ops->commit))
213 ovl_ops->commit(subdrv_dev, i);
214 }
215
216 if (mgr_ops && mgr_ops->commit)
217 mgr_ops->commit(subdrv_dev);
218}
219
220static void vidi_commit(struct device *dev)
221{
222 struct vidi_context *ctx = get_vidi_context(dev);
223
224 DRM_DEBUG_KMS("%s\n", __FILE__);
225
226 if (ctx->suspended)
227 return;
228}
229
230static int vidi_enable_vblank(struct device *dev)
231{
232 struct vidi_context *ctx = get_vidi_context(dev);
233
234 DRM_DEBUG_KMS("%s\n", __FILE__);
235
236 if (ctx->suspended)
237 return -EPERM;
238
239 if (!test_and_set_bit(0, &ctx->irq_flags))
240 ctx->vblank_on = true;
241
242 return 0;
243}
244
245static void vidi_disable_vblank(struct device *dev)
246{
247 struct vidi_context *ctx = get_vidi_context(dev);
248
249 DRM_DEBUG_KMS("%s\n", __FILE__);
250
251 if (ctx->suspended)
252 return;
253
254 if (test_and_clear_bit(0, &ctx->irq_flags))
255 ctx->vblank_on = false;
256}
257
258static struct exynos_drm_manager_ops vidi_manager_ops = {
259 .dpms = vidi_dpms,
260 .apply = vidi_apply,
261 .commit = vidi_commit,
262 .enable_vblank = vidi_enable_vblank,
263 .disable_vblank = vidi_disable_vblank,
264};
265
266static void vidi_win_mode_set(struct device *dev,
267 struct exynos_drm_overlay *overlay)
268{
269 struct vidi_context *ctx = get_vidi_context(dev);
270 struct vidi_win_data *win_data;
271 int win;
272 unsigned long offset;
273
274 DRM_DEBUG_KMS("%s\n", __FILE__);
275
276 if (!overlay) {
277 dev_err(dev, "overlay is NULL\n");
278 return;
279 }
280
281 win = overlay->zpos;
282 if (win == DEFAULT_ZPOS)
283 win = ctx->default_win;
284
285 if (win < 0 || win > WINDOWS_NR)
286 return;
287
288 offset = overlay->fb_x * (overlay->bpp >> 3);
289 offset += overlay->fb_y * overlay->pitch;
290
291 DRM_DEBUG_KMS("offset = 0x%lx, pitch = %x\n", offset, overlay->pitch);
292
293 win_data = &ctx->win_data[win];
294
295 win_data->offset_x = overlay->crtc_x;
296 win_data->offset_y = overlay->crtc_y;
297 win_data->ovl_width = overlay->crtc_width;
298 win_data->ovl_height = overlay->crtc_height;
299 win_data->fb_width = overlay->fb_width;
300 win_data->fb_height = overlay->fb_height;
301 win_data->dma_addr = overlay->dma_addr[0] + offset;
302 win_data->vaddr = overlay->vaddr[0] + offset;
303 win_data->bpp = overlay->bpp;
304 win_data->buf_offsize = (overlay->fb_width - overlay->crtc_width) *
305 (overlay->bpp >> 3);
306 win_data->line_size = overlay->crtc_width * (overlay->bpp >> 3);
307
308 /*
309 * some parts of win_data should be transferred to user side
310 * through specific ioctl.
311 */
312
313 DRM_DEBUG_KMS("offset_x = %d, offset_y = %d\n",
314 win_data->offset_x, win_data->offset_y);
315 DRM_DEBUG_KMS("ovl_width = %d, ovl_height = %d\n",
316 win_data->ovl_width, win_data->ovl_height);
317 DRM_DEBUG_KMS("paddr = 0x%lx, vaddr = 0x%lx\n",
318 (unsigned long)win_data->dma_addr,
319 (unsigned long)win_data->vaddr);
320 DRM_DEBUG_KMS("fb_width = %d, crtc_width = %d\n",
321 overlay->fb_width, overlay->crtc_width);
322}
323
324static void vidi_win_commit(struct device *dev, int zpos)
325{
326 struct vidi_context *ctx = get_vidi_context(dev);
327 struct vidi_win_data *win_data;
328 int win = zpos;
329
330 DRM_DEBUG_KMS("%s\n", __FILE__);
331
332 if (ctx->suspended)
333 return;
334
335 if (win == DEFAULT_ZPOS)
336 win = ctx->default_win;
337
338 if (win < 0 || win > WINDOWS_NR)
339 return;
340
341 win_data = &ctx->win_data[win];
342
343 win_data->enabled = true;
344
345 DRM_DEBUG_KMS("dma_addr = 0x%x\n", win_data->dma_addr);
346
347 if (ctx->vblank_on)
348 schedule_work(&ctx->work);
349}
350
351static void vidi_win_disable(struct device *dev, int zpos)
352{
353 struct vidi_context *ctx = get_vidi_context(dev);
354 struct vidi_win_data *win_data;
355 int win = zpos;
356
357 DRM_DEBUG_KMS("%s\n", __FILE__);
358
359 if (win == DEFAULT_ZPOS)
360 win = ctx->default_win;
361
362 if (win < 0 || win > WINDOWS_NR)
363 return;
364
365 win_data = &ctx->win_data[win];
366 win_data->enabled = false;
367
368 /* TODO. */
369}
370
371static struct exynos_drm_overlay_ops vidi_overlay_ops = {
372 .mode_set = vidi_win_mode_set,
373 .commit = vidi_win_commit,
374 .disable = vidi_win_disable,
375};
376
377static struct exynos_drm_manager vidi_manager = {
378 .pipe = -1,
379 .ops = &vidi_manager_ops,
380 .overlay_ops = &vidi_overlay_ops,
381 .display_ops = &vidi_display_ops,
382};
383
384static void vidi_finish_pageflip(struct drm_device *drm_dev, int crtc)
385{
386 struct exynos_drm_private *dev_priv = drm_dev->dev_private;
387 struct drm_pending_vblank_event *e, *t;
388 struct timeval now;
389 unsigned long flags;
390 bool is_checked = false;
391
392 spin_lock_irqsave(&drm_dev->event_lock, flags);
393
394 list_for_each_entry_safe(e, t, &dev_priv->pageflip_event_list,
395 base.link) {
396 /* if event's pipe isn't same as crtc then ignore it. */
397 if (crtc != e->pipe)
398 continue;
399
400 is_checked = true;
401
402 do_gettimeofday(&now);
403 e->event.sequence = 0;
404 e->event.tv_sec = now.tv_sec;
405 e->event.tv_usec = now.tv_usec;
406
407 list_move_tail(&e->base.link, &e->base.file_priv->event_list);
408 wake_up_interruptible(&e->base.file_priv->event_wait);
409 }
410
411 if (is_checked) {
412 /*
413 * call drm_vblank_put only in case that drm_vblank_get was
414 * called.
415 */
416 if (atomic_read(&drm_dev->vblank_refcount[crtc]) > 0)
417 drm_vblank_put(drm_dev, crtc);
418
419 /*
420 * don't off vblank if vblank_disable_allowed is 1,
421 * because vblank would be off by timer handler.
422 */
423 if (!drm_dev->vblank_disable_allowed)
424 drm_vblank_off(drm_dev, crtc);
425 }
426
427 spin_unlock_irqrestore(&drm_dev->event_lock, flags);
428}
429
430static void vidi_fake_vblank_handler(struct work_struct *work)
431{
432 struct vidi_context *ctx = container_of(work, struct vidi_context,
433 work);
434 struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
435 struct exynos_drm_manager *manager = subdrv->manager;
436
437 if (manager->pipe < 0)
438 return;
439
440 /* refresh rate is about 50Hz. */
441 usleep_range(16000, 20000);
442
443 drm_handle_vblank(subdrv->drm_dev, manager->pipe);
444 vidi_finish_pageflip(subdrv->drm_dev, manager->pipe);
445}
446
447static int vidi_subdrv_probe(struct drm_device *drm_dev, struct device *dev)
448{
449 DRM_DEBUG_KMS("%s\n", __FILE__);
450
451 /*
452 * enable drm irq mode.
453 * - with irq_enabled = 1, we can use the vblank feature.
454 *
455 * P.S. note that we wouldn't use drm irq handler but
456 * just specific driver own one instead because
457 * drm framework supports only one irq handler.
458 */
459 drm_dev->irq_enabled = 1;
460
461 /*
462 * with vblank_disable_allowed = 1, vblank interrupt will be disabled
463 * by drm timer once a current process gives up ownership of
464 * vblank event.(after drm_vblank_put function is called)
465 */
466 drm_dev->vblank_disable_allowed = 1;
467
468 return 0;
469}
470
471static void vidi_subdrv_remove(struct drm_device *drm_dev)
472{
473 DRM_DEBUG_KMS("%s\n", __FILE__);
474
475 /* TODO. */
476}
477
478static int vidi_power_on(struct vidi_context *ctx, bool enable)
479{
480 struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
481 struct device *dev = subdrv->dev;
482
483 DRM_DEBUG_KMS("%s\n", __FILE__);
484
485 if (enable != false && enable != true)
486 return -EINVAL;
487
488 if (enable) {
489 ctx->suspended = false;
490
491 /* if vblank was enabled status, enable it again. */
492 if (test_and_clear_bit(0, &ctx->irq_flags))
493 vidi_enable_vblank(dev);
494
495 vidi_apply(dev);
496 } else {
497 ctx->suspended = true;
498 }
499
500 return 0;
501}
502
503static int vidi_show_connection(struct device *dev,
504 struct device_attribute *attr, char *buf)
505{
506 int rc;
507 struct vidi_context *ctx = get_vidi_context(dev);
508
509 mutex_lock(&ctx->lock);
510
511 rc = sprintf(buf, "%d\n", ctx->connected);
512
513 mutex_unlock(&ctx->lock);
514
515 return rc;
516}
517
518static int vidi_store_connection(struct device *dev,
519 struct device_attribute *attr,
520 const char *buf, size_t len)
521{
522 struct vidi_context *ctx = get_vidi_context(dev);
523 int ret;
524
525 DRM_DEBUG_KMS("%s\n", __FILE__);
526
527 ret = kstrtoint(buf, 0, &ctx->connected);
528 if (ret)
529 return ret;
530
531 if (ctx->connected > 1)
532 return -EINVAL;
533
534 DRM_DEBUG_KMS("requested connection.\n");
535
536 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev);
537
538 return len;
539}
540
541static DEVICE_ATTR(connection, 0644, vidi_show_connection,
542 vidi_store_connection);
543
544int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
545 struct drm_file *file_priv)
546{
547 struct vidi_context *ctx = NULL;
548 struct drm_encoder *encoder;
549 struct exynos_drm_manager *manager;
550 struct exynos_drm_display_ops *display_ops;
551 struct drm_exynos_vidi_connection *vidi = data;
552
553 DRM_DEBUG_KMS("%s\n", __FILE__);
554
555 if (!vidi) {
556 DRM_DEBUG_KMS("user data for vidi is null.\n");
557 return -EINVAL;
558 }
559
560 if (!vidi->edid) {
561 DRM_DEBUG_KMS("edid data is null.\n");
562 return -EINVAL;
563 }
564
565 if (vidi->connection > 1) {
566 DRM_DEBUG_KMS("connection should be 0 or 1.\n");
567 return -EINVAL;
568 }
569
570 list_for_each_entry(encoder, &drm_dev->mode_config.encoder_list,
571 head) {
572 manager = exynos_drm_get_manager(encoder);
573 display_ops = manager->display_ops;
574
575 if (display_ops->type == EXYNOS_DISPLAY_TYPE_VIDI) {
576 ctx = get_vidi_context(manager->dev);
577 break;
578 }
579 }
580
581 if (!ctx) {
582 DRM_DEBUG_KMS("not found virtual device type encoder.\n");
583 return -EINVAL;
584 }
585
586 if (ctx->connected == vidi->connection) {
587 DRM_DEBUG_KMS("same connection request.\n");
588 return -EINVAL;
589 }
590
591 if (vidi->connection)
592 ctx->raw_edid = (struct edid *)vidi->edid;
593
594 ctx->connected = vidi->connection;
595 drm_helper_hpd_irq_event(ctx->subdrv.drm_dev);
596
597 return 0;
598}
599
600static int __devinit vidi_probe(struct platform_device *pdev)
601{
602 struct device *dev = &pdev->dev;
603 struct vidi_context *ctx;
604 struct exynos_drm_subdrv *subdrv;
605 int ret;
606
607 DRM_DEBUG_KMS("%s\n", __FILE__);
608
609 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
610 if (!ctx)
611 return -ENOMEM;
612
613 ctx->default_win = 0;
614
615 INIT_WORK(&ctx->work, vidi_fake_vblank_handler);
616
617 /* for test */
618 ctx->raw_edid = (struct edid *)fake_edid_info;
619
620 subdrv = &ctx->subdrv;
621 subdrv->dev = dev;
622 subdrv->manager = &vidi_manager;
623 subdrv->probe = vidi_subdrv_probe;
624 subdrv->remove = vidi_subdrv_remove;
625
626 mutex_init(&ctx->lock);
627
628 platform_set_drvdata(pdev, ctx);
629
630 ret = device_create_file(&pdev->dev, &dev_attr_connection);
631 if (ret < 0)
632 DRM_INFO("failed to create connection sysfs.\n");
633
634 exynos_drm_subdrv_register(subdrv);
635
636 return 0;
637}
638
639static int __devexit vidi_remove(struct platform_device *pdev)
640{
641 struct vidi_context *ctx = platform_get_drvdata(pdev);
642
643 DRM_DEBUG_KMS("%s\n", __FILE__);
644
645 exynos_drm_subdrv_unregister(&ctx->subdrv);
646
647 kfree(ctx);
648
649 return 0;
650}
651
652#ifdef CONFIG_PM_SLEEP
653static int vidi_suspend(struct device *dev)
654{
655 struct vidi_context *ctx = get_vidi_context(dev);
656
657 return vidi_power_on(ctx, false);
658}
659
660static int vidi_resume(struct device *dev)
661{
662 struct vidi_context *ctx = get_vidi_context(dev);
663
664 return vidi_power_on(ctx, true);
665}
666#endif
667
668static const struct dev_pm_ops vidi_pm_ops = {
669 SET_SYSTEM_SLEEP_PM_OPS(vidi_suspend, vidi_resume)
670};
671
672struct platform_driver vidi_driver = {
673 .probe = vidi_probe,
674 .remove = __devexit_p(vidi_remove),
675 .driver = {
676 .name = "exynos-drm-vidi",
677 .owner = THIS_MODULE,
678 .pm = &vidi_pm_ops,
679 },
680};