drm/radeon: add debugfs file for dma rings
[linux-3.10.git] / drivers / staging / omapdrm / omap_plane.c
1 /*
2  * drivers/staging/omapdrm/omap_plane.c
3  *
4  * Copyright (C) 2011 Texas Instruments
5  * Author: Rob Clark <rob.clark@linaro.org>
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 version 2 as published by
9  * the Free Software Foundation.
10  *
11  * This program is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14  * more details.
15  *
16  * You should have received a copy of the GNU General Public License along with
17  * this program.  If not, see <http://www.gnu.org/licenses/>.
18  */
19
20 #include <linux/kfifo.h>
21
22 #include "omap_drv.h"
23 #include "omap_dmm_tiler.h"
24
25 /* some hackery because omapdss has an 'enum omap_plane' (which would be
26  * better named omap_plane_id).. and compiler seems unhappy about having
27  * both a 'struct omap_plane' and 'enum omap_plane'
28  */
29 #define omap_plane _omap_plane
30
31 /*
32  * plane funcs
33  */
34
35 struct callback {
36         void (*fxn)(void *);
37         void *arg;
38 };
39
40 #define to_omap_plane(x) container_of(x, struct omap_plane, base)
41
42 struct omap_plane {
43         struct drm_plane base;
44         struct omap_overlay *ovl;
45         struct omap_overlay_info info;
46
47         /* position/orientation of scanout within the fb: */
48         struct omap_drm_window win;
49
50
51         /* last fb that we pinned: */
52         struct drm_framebuffer *pinned_fb;
53
54         uint32_t nformats;
55         uint32_t formats[32];
56
57         /* for synchronizing access to unpins fifo */
58         struct mutex unpin_mutex;
59
60         /* set of bo's pending unpin until next END_WIN irq */
61         DECLARE_KFIFO_PTR(unpin_fifo, struct drm_gem_object *);
62         int num_unpins, pending_num_unpins;
63
64         /* for deferred unpin when we need to wait for scanout complete irq */
65         struct work_struct work;
66
67         /* callback on next endwin irq */
68         struct callback endwin;
69 };
70
71 /* map from ovl->id to the irq we are interested in for scanout-done */
72 static const uint32_t id2irq[] = {
73                 [OMAP_DSS_GFX]    = DISPC_IRQ_GFX_END_WIN,
74                 [OMAP_DSS_VIDEO1] = DISPC_IRQ_VID1_END_WIN,
75                 [OMAP_DSS_VIDEO2] = DISPC_IRQ_VID2_END_WIN,
76                 [OMAP_DSS_VIDEO3] = DISPC_IRQ_VID3_END_WIN,
77 };
78
79 static void dispc_isr(void *arg, uint32_t mask)
80 {
81         struct drm_plane *plane = arg;
82         struct omap_plane *omap_plane = to_omap_plane(plane);
83         struct omap_drm_private *priv = plane->dev->dev_private;
84
85         omap_dispc_unregister_isr(dispc_isr, plane,
86                         id2irq[omap_plane->ovl->id]);
87
88         queue_work(priv->wq, &omap_plane->work);
89 }
90
91 static void unpin_worker(struct work_struct *work)
92 {
93         struct omap_plane *omap_plane =
94                         container_of(work, struct omap_plane, work);
95         struct callback endwin;
96
97         mutex_lock(&omap_plane->unpin_mutex);
98         DBG("unpinning %d of %d", omap_plane->num_unpins,
99                         omap_plane->num_unpins + omap_plane->pending_num_unpins);
100         while (omap_plane->num_unpins > 0) {
101                 struct drm_gem_object *bo = NULL;
102                 int ret = kfifo_get(&omap_plane->unpin_fifo, &bo);
103                 WARN_ON(!ret);
104                 omap_gem_put_paddr(bo);
105                 drm_gem_object_unreference_unlocked(bo);
106                 omap_plane->num_unpins--;
107         }
108         endwin = omap_plane->endwin;
109         omap_plane->endwin.fxn = NULL;
110         mutex_unlock(&omap_plane->unpin_mutex);
111
112         if (endwin.fxn)
113                 endwin.fxn(endwin.arg);
114 }
115
116 static void install_irq(struct drm_plane *plane)
117 {
118         struct omap_plane *omap_plane = to_omap_plane(plane);
119         struct omap_overlay *ovl = omap_plane->ovl;
120         int ret;
121
122         ret = omap_dispc_register_isr(dispc_isr, plane, id2irq[ovl->id]);
123
124         /*
125          * omapdss has upper limit on # of registered irq handlers,
126          * which we shouldn't hit.. but if we do the limit should
127          * be raised or bad things happen:
128          */
129         WARN_ON(ret == -EBUSY);
130 }
131
132 /* push changes down to dss2 */
133 static int commit(struct drm_plane *plane)
134 {
135         struct drm_device *dev = plane->dev;
136         struct omap_plane *omap_plane = to_omap_plane(plane);
137         struct omap_overlay *ovl = omap_plane->ovl;
138         struct omap_overlay_info *info = &omap_plane->info;
139         int ret;
140
141         DBG("%s", ovl->name);
142         DBG("%dx%d -> %dx%d (%d)", info->width, info->height, info->out_width,
143                         info->out_height, info->screen_width);
144         DBG("%d,%d %08x %08x", info->pos_x, info->pos_y,
145                         info->paddr, info->p_uv_addr);
146
147         /* NOTE: do we want to do this at all here, or just wait
148          * for dpms(ON) since other CRTC's may not have their mode
149          * set yet, so fb dimensions may still change..
150          */
151         ret = ovl->set_overlay_info(ovl, info);
152         if (ret) {
153                 dev_err(dev->dev, "could not set overlay info\n");
154                 return ret;
155         }
156
157         mutex_lock(&omap_plane->unpin_mutex);
158         omap_plane->num_unpins += omap_plane->pending_num_unpins;
159         omap_plane->pending_num_unpins = 0;
160         mutex_unlock(&omap_plane->unpin_mutex);
161
162         /* our encoder doesn't necessarily get a commit() after this, in
163          * particular in the dpms() and mode_set_base() cases, so force the
164          * manager to update:
165          *
166          * could this be in the encoder somehow?
167          */
168         if (ovl->manager) {
169                 ret = ovl->manager->apply(ovl->manager);
170                 if (ret) {
171                         dev_err(dev->dev, "could not apply settings\n");
172                         return ret;
173                 }
174
175                 /*
176                  * NOTE: really this should be atomic w/ mgr->apply() but
177                  * omapdss does not expose such an API
178                  */
179                 if (omap_plane->num_unpins > 0)
180                         install_irq(plane);
181
182         } else {
183                 struct omap_drm_private *priv = dev->dev_private;
184                 queue_work(priv->wq, &omap_plane->work);
185         }
186
187
188         if (ovl->is_enabled(ovl)) {
189                 omap_framebuffer_flush(plane->fb, info->pos_x, info->pos_y,
190                                 info->out_width, info->out_height);
191         }
192
193         return 0;
194 }
195
196 /* when CRTC that we are attached to has potentially changed, this checks
197  * if we are attached to proper manager, and if necessary updates.
198  */
199 static void update_manager(struct drm_plane *plane)
200 {
201         struct omap_drm_private *priv = plane->dev->dev_private;
202         struct omap_plane *omap_plane = to_omap_plane(plane);
203         struct omap_overlay *ovl = omap_plane->ovl;
204         struct omap_overlay_manager *mgr = NULL;
205         int i;
206
207         if (plane->crtc) {
208                 for (i = 0; i < priv->num_encoders; i++) {
209                         struct drm_encoder *encoder = priv->encoders[i];
210                         if (encoder->crtc == plane->crtc) {
211                                 mgr = omap_encoder_get_manager(encoder);
212                                 break;
213                         }
214                 }
215         }
216
217         if (ovl->manager != mgr) {
218                 bool enabled = ovl->is_enabled(ovl);
219
220                 /* don't switch things around with enabled overlays: */
221                 if (enabled)
222                         omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
223
224                 if (ovl->manager) {
225                         DBG("disconnecting %s from %s", ovl->name,
226                                         ovl->manager->name);
227                         ovl->unset_manager(ovl);
228                 }
229
230                 if (mgr) {
231                         DBG("connecting %s to %s", ovl->name, mgr->name);
232                         ovl->set_manager(ovl, mgr);
233                 }
234
235                 if (enabled && mgr)
236                         omap_plane_dpms(plane, DRM_MODE_DPMS_ON);
237         }
238 }
239
240 static void unpin(void *arg, struct drm_gem_object *bo)
241 {
242         struct drm_plane *plane = arg;
243         struct omap_plane *omap_plane = to_omap_plane(plane);
244
245         if (kfifo_put(&omap_plane->unpin_fifo,
246                         (const struct drm_gem_object **)&bo)) {
247                 omap_plane->pending_num_unpins++;
248                 /* also hold a ref so it isn't free'd while pinned */
249                 drm_gem_object_reference(bo);
250         } else {
251                 dev_err(plane->dev->dev, "unpin fifo full!\n");
252                 omap_gem_put_paddr(bo);
253         }
254 }
255
256 /* update which fb (if any) is pinned for scanout */
257 static int update_pin(struct drm_plane *plane, struct drm_framebuffer *fb)
258 {
259         struct omap_plane *omap_plane = to_omap_plane(plane);
260         struct drm_framebuffer *pinned_fb = omap_plane->pinned_fb;
261
262         if (pinned_fb != fb) {
263                 int ret;
264
265                 DBG("%p -> %p", pinned_fb, fb);
266
267                 mutex_lock(&omap_plane->unpin_mutex);
268                 ret = omap_framebuffer_replace(pinned_fb, fb, plane, unpin);
269                 mutex_unlock(&omap_plane->unpin_mutex);
270
271                 if (ret) {
272                         dev_err(plane->dev->dev, "could not swap %p -> %p\n",
273                                         omap_plane->pinned_fb, fb);
274                         omap_plane->pinned_fb = NULL;
275                         return ret;
276                 }
277
278                 omap_plane->pinned_fb = fb;
279         }
280
281         return 0;
282 }
283
284 /* update parameters that are dependent on the framebuffer dimensions and
285  * position within the fb that this plane scans out from. This is called
286  * when framebuffer or x,y base may have changed.
287  */
288 static void update_scanout(struct drm_plane *plane)
289 {
290         struct omap_plane *omap_plane = to_omap_plane(plane);
291         struct omap_overlay_info *info = &omap_plane->info;
292         struct omap_drm_window *win = &omap_plane->win;
293         int ret;
294
295         ret = update_pin(plane, plane->fb);
296         if (ret) {
297                 dev_err(plane->dev->dev,
298                         "could not pin fb: %d\n", ret);
299                 omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
300                 return;
301         }
302
303         omap_framebuffer_update_scanout(plane->fb, win, info);
304
305         DBG("%s: %d,%d: %08x %08x (%d)", omap_plane->ovl->name,
306                         win->src_x, win->src_y,
307                         (u32)info->paddr, (u32)info->p_uv_addr,
308                         info->screen_width);
309 }
310
311 int omap_plane_mode_set(struct drm_plane *plane,
312                 struct drm_crtc *crtc, struct drm_framebuffer *fb,
313                 int crtc_x, int crtc_y,
314                 unsigned int crtc_w, unsigned int crtc_h,
315                 uint32_t src_x, uint32_t src_y,
316                 uint32_t src_w, uint32_t src_h)
317 {
318         struct omap_plane *omap_plane = to_omap_plane(plane);
319         struct omap_drm_window *win = &omap_plane->win;
320
321         win->crtc_x = crtc_x;
322         win->crtc_y = crtc_y;
323         win->crtc_w = crtc_w;
324         win->crtc_h = crtc_h;
325
326         /* src values are in Q16 fixed point, convert to integer: */
327         win->src_x = src_x >> 16;
328         win->src_y = src_y >> 16;
329         win->src_w = src_w >> 16;
330         win->src_h = src_h >> 16;
331
332         /* note: this is done after this fxn returns.. but if we need
333          * to do a commit/update_scanout, etc before this returns we
334          * need the current value.
335          */
336         plane->fb = fb;
337         plane->crtc = crtc;
338
339         update_scanout(plane);
340         update_manager(plane);
341
342         return 0;
343 }
344
345 static int omap_plane_update(struct drm_plane *plane,
346                 struct drm_crtc *crtc, struct drm_framebuffer *fb,
347                 int crtc_x, int crtc_y,
348                 unsigned int crtc_w, unsigned int crtc_h,
349                 uint32_t src_x, uint32_t src_y,
350                 uint32_t src_w, uint32_t src_h)
351 {
352         omap_plane_mode_set(plane, crtc, fb, crtc_x, crtc_y, crtc_w, crtc_h,
353                         src_x, src_y, src_w, src_h);
354         return omap_plane_dpms(plane, DRM_MODE_DPMS_ON);
355 }
356
357 static int omap_plane_disable(struct drm_plane *plane)
358 {
359         struct omap_plane *omap_plane = to_omap_plane(plane);
360         omap_plane->win.rotation = BIT(DRM_ROTATE_0);
361         return omap_plane_dpms(plane, DRM_MODE_DPMS_OFF);
362 }
363
364 static void omap_plane_destroy(struct drm_plane *plane)
365 {
366         struct omap_plane *omap_plane = to_omap_plane(plane);
367         DBG("%s", omap_plane->ovl->name);
368         omap_plane_disable(plane);
369         drm_plane_cleanup(plane);
370         WARN_ON(omap_plane->pending_num_unpins + omap_plane->num_unpins > 0);
371         kfifo_free(&omap_plane->unpin_fifo);
372         kfree(omap_plane);
373 }
374
375 int omap_plane_dpms(struct drm_plane *plane, int mode)
376 {
377         struct omap_plane *omap_plane = to_omap_plane(plane);
378         struct omap_overlay *ovl = omap_plane->ovl;
379         int r;
380
381         DBG("%s: %d", omap_plane->ovl->name, mode);
382
383         if (mode == DRM_MODE_DPMS_ON) {
384                 update_scanout(plane);
385                 r = commit(plane);
386                 if (!r)
387                         r = ovl->enable(ovl);
388         } else {
389                 struct omap_drm_private *priv = plane->dev->dev_private;
390                 r = ovl->disable(ovl);
391                 update_pin(plane, NULL);
392                 queue_work(priv->wq, &omap_plane->work);
393         }
394
395         return r;
396 }
397
398 void omap_plane_on_endwin(struct drm_plane *plane,
399                 void (*fxn)(void *), void *arg)
400 {
401         struct omap_plane *omap_plane = to_omap_plane(plane);
402
403         mutex_lock(&omap_plane->unpin_mutex);
404         omap_plane->endwin.fxn = fxn;
405         omap_plane->endwin.arg = arg;
406         mutex_unlock(&omap_plane->unpin_mutex);
407
408         install_irq(plane);
409 }
410
411 /* helper to install properties which are common to planes and crtcs */
412 void omap_plane_install_properties(struct drm_plane *plane,
413                 struct drm_mode_object *obj)
414 {
415         struct drm_device *dev = plane->dev;
416         struct omap_drm_private *priv = dev->dev_private;
417         struct drm_property *prop;
418
419         if (priv->has_dmm) {
420                 prop = priv->rotation_prop;
421                 if (!prop) {
422                         const struct drm_prop_enum_list props[] = {
423                                         { DRM_ROTATE_0,   "rotate-0" },
424                                         { DRM_ROTATE_90,  "rotate-90" },
425                                         { DRM_ROTATE_180, "rotate-180" },
426                                         { DRM_ROTATE_270, "rotate-270" },
427                                         { DRM_REFLECT_X,  "reflect-x" },
428                                         { DRM_REFLECT_Y,  "reflect-y" },
429                         };
430                         prop = drm_property_create_bitmask(dev, 0, "rotation",
431                                         props, ARRAY_SIZE(props));
432                         if (prop == NULL)
433                                 return;
434                         priv->rotation_prop = prop;
435                 }
436                 drm_object_attach_property(obj, prop, 0);
437         }
438
439         prop = priv->zorder_prop;
440         if (!prop) {
441                 prop = drm_property_create_range(dev, 0, "zorder", 0, 3);
442                 if (prop == NULL)
443                         return;
444                 priv->zorder_prop = prop;
445         }
446         drm_object_attach_property(obj, prop, 0);
447 }
448
449 int omap_plane_set_property(struct drm_plane *plane,
450                 struct drm_property *property, uint64_t val)
451 {
452         struct omap_plane *omap_plane = to_omap_plane(plane);
453         struct omap_drm_private *priv = plane->dev->dev_private;
454         int ret = -EINVAL;
455
456         if (property == priv->rotation_prop) {
457                 struct omap_overlay *ovl = omap_plane->ovl;
458
459                 DBG("%s: rotation: %02x", ovl->name, (uint32_t)val);
460                 omap_plane->win.rotation = val;
461
462                 if (ovl->is_enabled(ovl))
463                         ret = omap_plane_dpms(plane, DRM_MODE_DPMS_ON);
464                 else
465                         ret = 0;
466         } else if (property == priv->zorder_prop) {
467                 struct omap_overlay *ovl = omap_plane->ovl;
468
469                 DBG("%s: zorder: %d", ovl->name, (uint32_t)val);
470                 omap_plane->info.zorder = val;
471
472                 if (ovl->is_enabled(ovl))
473                         ret = omap_plane_dpms(plane, DRM_MODE_DPMS_ON);
474                 else
475                         ret = 0;
476         }
477
478         return ret;
479 }
480
481 static const struct drm_plane_funcs omap_plane_funcs = {
482                 .update_plane = omap_plane_update,
483                 .disable_plane = omap_plane_disable,
484                 .destroy = omap_plane_destroy,
485                 .set_property = omap_plane_set_property,
486 };
487
488 /* initialize plane */
489 struct drm_plane *omap_plane_init(struct drm_device *dev,
490                 struct omap_overlay *ovl, unsigned int possible_crtcs,
491                 bool priv)
492 {
493         struct drm_plane *plane = NULL;
494         struct omap_plane *omap_plane;
495         int ret;
496
497         DBG("%s: possible_crtcs=%08x, priv=%d", ovl->name,
498                         possible_crtcs, priv);
499
500         /* friendly reminder to update table for future hw: */
501         WARN_ON(ovl->id >= ARRAY_SIZE(id2irq));
502
503         omap_plane = kzalloc(sizeof(*omap_plane), GFP_KERNEL);
504         if (!omap_plane) {
505                 dev_err(dev->dev, "could not allocate plane\n");
506                 goto fail;
507         }
508
509         mutex_init(&omap_plane->unpin_mutex);
510
511         ret = kfifo_alloc(&omap_plane->unpin_fifo, 16, GFP_KERNEL);
512         if (ret) {
513                 dev_err(dev->dev, "could not allocate unpin FIFO\n");
514                 goto fail;
515         }
516
517         INIT_WORK(&omap_plane->work, unpin_worker);
518
519         omap_plane->nformats = omap_framebuffer_get_formats(
520                         omap_plane->formats, ARRAY_SIZE(omap_plane->formats),
521                         ovl->supported_modes);
522         omap_plane->ovl = ovl;
523         plane = &omap_plane->base;
524
525         drm_plane_init(dev, plane, possible_crtcs, &omap_plane_funcs,
526                         omap_plane->formats, omap_plane->nformats, priv);
527
528         omap_plane_install_properties(plane, &plane->base);
529
530         /* get our starting configuration, set defaults for parameters
531          * we don't currently use, etc:
532          */
533         ovl->get_overlay_info(ovl, &omap_plane->info);
534         omap_plane->info.rotation_type = OMAP_DSS_ROT_DMA;
535         omap_plane->info.rotation = OMAP_DSS_ROT_0;
536         omap_plane->info.global_alpha = 0xff;
537         omap_plane->info.mirror = 0;
538
539         /* Set defaults depending on whether we are a CRTC or overlay
540          * layer.
541          * TODO add ioctl to give userspace an API to change this.. this
542          * will come in a subsequent patch.
543          */
544         if (priv)
545                 omap_plane->info.zorder = 0;
546         else
547                 omap_plane->info.zorder = ovl->id;
548
549         update_manager(plane);
550
551         return plane;
552
553 fail:
554         if (plane)
555                 omap_plane_destroy(plane);
556
557         return NULL;
558 }