Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
[linux-3.10.git] / drivers / gpu / drm / omapdrm / omap_fbdev.c
1 /*
2  * drivers/gpu/drm/omapdrm/omap_fbdev.c
3  *
4  * Copyright (C) 2011 Texas Instruments
5  * Author: Rob Clark <rob@ti.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 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 "omap_drv.h"
21
22 #include "drm_crtc.h"
23 #include "drm_fb_helper.h"
24
25 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
26 static bool ywrap_enabled = true;
27 module_param_named(ywrap, ywrap_enabled, bool, 0644);
28
29 /*
30  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
31  */
32
33 #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
34
35 struct omap_fbdev {
36         struct drm_fb_helper base;
37         struct drm_framebuffer *fb;
38         struct drm_gem_object *bo;
39         bool ywrap_enabled;
40
41         /* for deferred dmm roll when getting called in atomic ctx */
42         struct work_struct work;
43 };
44
45 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h);
46 static struct drm_fb_helper *get_fb(struct fb_info *fbi);
47
48 static ssize_t omap_fbdev_write(struct fb_info *fbi, const char __user *buf,
49                 size_t count, loff_t *ppos)
50 {
51         ssize_t res;
52
53         res = fb_sys_write(fbi, buf, count, ppos);
54         omap_fbdev_flush(fbi, 0, 0, fbi->var.xres, fbi->var.yres);
55
56         return res;
57 }
58
59 static void omap_fbdev_fillrect(struct fb_info *fbi,
60                 const struct fb_fillrect *rect)
61 {
62         sys_fillrect(fbi, rect);
63         omap_fbdev_flush(fbi, rect->dx, rect->dy, rect->width, rect->height);
64 }
65
66 static void omap_fbdev_copyarea(struct fb_info *fbi,
67                 const struct fb_copyarea *area)
68 {
69         sys_copyarea(fbi, area);
70         omap_fbdev_flush(fbi, area->dx, area->dy, area->width, area->height);
71 }
72
73 static void omap_fbdev_imageblit(struct fb_info *fbi,
74                 const struct fb_image *image)
75 {
76         sys_imageblit(fbi, image);
77         omap_fbdev_flush(fbi, image->dx, image->dy,
78                                 image->width, image->height);
79 }
80
81 static void pan_worker(struct work_struct *work)
82 {
83         struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
84         struct fb_info *fbi = fbdev->base.fbdev;
85         int npages;
86
87         /* DMM roll shifts in 4K pages: */
88         npages = fbi->fix.line_length >> PAGE_SHIFT;
89         omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
90 }
91
92 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
93                 struct fb_info *fbi)
94 {
95         struct drm_fb_helper *helper = get_fb(fbi);
96         struct omap_fbdev *fbdev = to_omap_fbdev(helper);
97
98         if (!helper)
99                 goto fallback;
100
101         if (!fbdev->ywrap_enabled)
102                 goto fallback;
103
104         if (drm_can_sleep()) {
105                 pan_worker(&fbdev->work);
106         } else {
107                 struct omap_drm_private *priv = helper->dev->dev_private;
108                 queue_work(priv->wq, &fbdev->work);
109         }
110
111         return 0;
112
113 fallback:
114         return drm_fb_helper_pan_display(var, fbi);
115 }
116
117 static struct fb_ops omap_fb_ops = {
118         .owner = THIS_MODULE,
119
120         /* Note: to properly handle manual update displays, we wrap the
121          * basic fbdev ops which write to the framebuffer
122          */
123         .fb_read = fb_sys_read,
124         .fb_write = omap_fbdev_write,
125         .fb_fillrect = omap_fbdev_fillrect,
126         .fb_copyarea = omap_fbdev_copyarea,
127         .fb_imageblit = omap_fbdev_imageblit,
128
129         .fb_check_var = drm_fb_helper_check_var,
130         .fb_set_par = drm_fb_helper_set_par,
131         .fb_pan_display = omap_fbdev_pan_display,
132         .fb_blank = drm_fb_helper_blank,
133         .fb_setcmap = drm_fb_helper_setcmap,
134 };
135
136 static int omap_fbdev_create(struct drm_fb_helper *helper,
137                 struct drm_fb_helper_surface_size *sizes)
138 {
139         struct omap_fbdev *fbdev = to_omap_fbdev(helper);
140         struct drm_device *dev = helper->dev;
141         struct omap_drm_private *priv = dev->dev_private;
142         struct drm_framebuffer *fb = NULL;
143         union omap_gem_size gsize;
144         struct fb_info *fbi = NULL;
145         struct drm_mode_fb_cmd2 mode_cmd = {0};
146         dma_addr_t paddr;
147         int ret;
148
149         /* only doing ARGB32 since this is what is needed to alpha-blend
150          * with video overlays:
151          */
152         sizes->surface_bpp = 32;
153         sizes->surface_depth = 32;
154
155         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
156                         sizes->surface_height, sizes->surface_bpp,
157                         sizes->fb_width, sizes->fb_height);
158
159         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
160                         sizes->surface_depth);
161
162         mode_cmd.width = sizes->surface_width;
163         mode_cmd.height = sizes->surface_height;
164
165         mode_cmd.pitches[0] = align_pitch(
166                         mode_cmd.width * ((sizes->surface_bpp + 7) / 8),
167                         mode_cmd.width, sizes->surface_bpp);
168
169         fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
170         if (fbdev->ywrap_enabled) {
171                 /* need to align pitch to page size if using DMM scrolling */
172                 mode_cmd.pitches[0] = ALIGN(mode_cmd.pitches[0], PAGE_SIZE);
173         }
174
175         /* allocate backing bo */
176         gsize = (union omap_gem_size){
177                 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
178         };
179         DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
180         fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
181         if (!fbdev->bo) {
182                 dev_err(dev->dev, "failed to allocate buffer object\n");
183                 ret = -ENOMEM;
184                 goto fail;
185         }
186
187         fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
188         if (IS_ERR(fb)) {
189                 dev_err(dev->dev, "failed to allocate fb\n");
190                 /* note: if fb creation failed, we can't rely on fb destroy
191                  * to unref the bo:
192                  */
193                 drm_gem_object_unreference(fbdev->bo);
194                 ret = PTR_ERR(fb);
195                 goto fail;
196         }
197
198         /* note: this keeps the bo pinned.. which is perhaps not ideal,
199          * but is needed as long as we use fb_mmap() to mmap to userspace
200          * (since this happens using fix.smem_start).  Possibly we could
201          * implement our own mmap using GEM mmap support to avoid this
202          * (non-tiled buffer doesn't need to be pinned for fbcon to write
203          * to it).  Then we just need to be sure that we are able to re-
204          * pin it in case of an opps.
205          */
206         ret = omap_gem_get_paddr(fbdev->bo, &paddr, true);
207         if (ret) {
208                 dev_err(dev->dev,
209                         "could not map (paddr)!  Skipping framebuffer alloc\n");
210                 ret = -ENOMEM;
211                 goto fail;
212         }
213
214         mutex_lock(&dev->struct_mutex);
215
216         fbi = framebuffer_alloc(0, dev->dev);
217         if (!fbi) {
218                 dev_err(dev->dev, "failed to allocate fb info\n");
219                 ret = -ENOMEM;
220                 goto fail_unlock;
221         }
222
223         DBG("fbi=%p, dev=%p", fbi, dev);
224
225         fbdev->fb = fb;
226         helper->fb = fb;
227         helper->fbdev = fbi;
228
229         fbi->par = helper;
230         fbi->flags = FBINFO_DEFAULT;
231         fbi->fbops = &omap_fb_ops;
232
233         strcpy(fbi->fix.id, MODULE_NAME);
234
235         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
236         if (ret) {
237                 ret = -ENOMEM;
238                 goto fail_unlock;
239         }
240
241         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
242         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
243
244         dev->mode_config.fb_base = paddr;
245
246         fbi->screen_base = omap_gem_vaddr(fbdev->bo);
247         fbi->screen_size = fbdev->bo->size;
248         fbi->fix.smem_start = paddr;
249         fbi->fix.smem_len = fbdev->bo->size;
250
251         /* if we have DMM, then we can use it for scrolling by just
252          * shuffling pages around in DMM rather than doing sw blit.
253          */
254         if (fbdev->ywrap_enabled) {
255                 DRM_INFO("Enabling DMM ywrap scrolling\n");
256                 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
257                 fbi->fix.ywrapstep = 1;
258         }
259
260
261         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
262         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
263
264         mutex_unlock(&dev->struct_mutex);
265
266         return 0;
267
268 fail_unlock:
269         mutex_unlock(&dev->struct_mutex);
270 fail:
271
272         if (ret) {
273                 if (fbi)
274                         framebuffer_release(fbi);
275                 if (fb) {
276                         drm_framebuffer_unregister_private(fb);
277                         drm_framebuffer_remove(fb);
278                 }
279         }
280
281         return ret;
282 }
283
284 static void omap_crtc_fb_gamma_set(struct drm_crtc *crtc,
285                 u16 red, u16 green, u16 blue, int regno)
286 {
287         DBG("fbdev: set gamma");
288 }
289
290 static void omap_crtc_fb_gamma_get(struct drm_crtc *crtc,
291                 u16 *red, u16 *green, u16 *blue, int regno)
292 {
293         DBG("fbdev: get gamma");
294 }
295
296 static struct drm_fb_helper_funcs omap_fb_helper_funcs = {
297         .gamma_set = omap_crtc_fb_gamma_set,
298         .gamma_get = omap_crtc_fb_gamma_get,
299         .fb_probe = omap_fbdev_create,
300 };
301
302 static struct drm_fb_helper *get_fb(struct fb_info *fbi)
303 {
304         if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
305                 /* these are not the fb's you're looking for */
306                 return NULL;
307         }
308         return fbi->par;
309 }
310
311 /* flush an area of the framebuffer (in case of manual update display that
312  * is not automatically flushed)
313  */
314 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h)
315 {
316         struct drm_fb_helper *helper = get_fb(fbi);
317
318         if (!helper)
319                 return;
320
321         VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi);
322
323         omap_framebuffer_flush(helper->fb, x, y, w, h);
324 }
325
326 /* initialize fbdev helper */
327 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
328 {
329         struct omap_drm_private *priv = dev->dev_private;
330         struct omap_fbdev *fbdev = NULL;
331         struct drm_fb_helper *helper;
332         int ret = 0;
333
334         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
335         if (!fbdev)
336                 goto fail;
337
338         INIT_WORK(&fbdev->work, pan_worker);
339
340         helper = &fbdev->base;
341
342         helper->funcs = &omap_fb_helper_funcs;
343
344         ret = drm_fb_helper_init(dev, helper,
345                         priv->num_crtcs, priv->num_connectors);
346         if (ret) {
347                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
348                 goto fail;
349         }
350
351         drm_fb_helper_single_add_all_connectors(helper);
352
353         /* disable all the possible outputs/crtcs before entering KMS mode */
354         drm_helper_disable_unused_functions(dev);
355
356         drm_fb_helper_initial_config(helper, 32);
357
358         priv->fbdev = helper;
359
360         return helper;
361
362 fail:
363         kfree(fbdev);
364         return NULL;
365 }
366
367 void omap_fbdev_free(struct drm_device *dev)
368 {
369         struct omap_drm_private *priv = dev->dev_private;
370         struct drm_fb_helper *helper = priv->fbdev;
371         struct omap_fbdev *fbdev;
372         struct fb_info *fbi;
373
374         DBG();
375
376         fbi = helper->fbdev;
377
378         /* only cleanup framebuffer if it is present */
379         if (fbi) {
380                 unregister_framebuffer(fbi);
381                 framebuffer_release(fbi);
382         }
383
384         drm_fb_helper_fini(helper);
385
386         fbdev = to_omap_fbdev(priv->fbdev);
387
388         /* this will free the backing object */
389         if (fbdev->fb) {
390                 drm_framebuffer_unregister_private(fbdev->fb);
391                 drm_framebuffer_remove(fbdev->fb);
392         }
393
394         kfree(fbdev);
395
396         priv->fbdev = NULL;
397 }