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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
25MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
26static bool ywrap_enabled = true;
27module_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
35struct 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
45static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h);
46static struct drm_fb_helper *get_fb(struct fb_info *fbi);
47
48static 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
59static 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
66static 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
73static 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
81static 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
92static 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
113fallback:
114 return drm_fb_helper_pan_display(var, fbi);
115}
116
117static 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
136static 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
268fail_unlock:
269 mutex_unlock(&dev->struct_mutex);
270fail:
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
284static struct drm_fb_helper_funcs omap_fb_helper_funcs = {
285 .fb_probe = omap_fbdev_create,
286};
287
288static struct drm_fb_helper *get_fb(struct fb_info *fbi)
289{
290 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
291 /* these are not the fb's you're looking for */
292 return NULL;
293 }
294 return fbi->par;
295}
296
297/* flush an area of the framebuffer (in case of manual update display that
298 * is not automatically flushed)
299 */
300static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h)
301{
302 struct drm_fb_helper *helper = get_fb(fbi);
303
304 if (!helper)
305 return;
306
307 VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi);
308
309 omap_framebuffer_flush(helper->fb, x, y, w, h);
310}
311
312/* initialize fbdev helper */
313struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
314{
315 struct omap_drm_private *priv = dev->dev_private;
316 struct omap_fbdev *fbdev = NULL;
317 struct drm_fb_helper *helper;
318 int ret = 0;
319
320 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
321 if (!fbdev)
322 goto fail;
323
324 INIT_WORK(&fbdev->work, pan_worker);
325
326 helper = &fbdev->base;
327
328 helper->funcs = &omap_fb_helper_funcs;
329
330 ret = drm_fb_helper_init(dev, helper,
331 priv->num_crtcs, priv->num_connectors);
332 if (ret) {
333 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
334 goto fail;
335 }
336
337 drm_fb_helper_single_add_all_connectors(helper);
338
339 /* disable all the possible outputs/crtcs before entering KMS mode */
340 drm_helper_disable_unused_functions(dev);
341
342 drm_fb_helper_initial_config(helper, 32);
343
344 priv->fbdev = helper;
345
346 return helper;
347
348fail:
349 kfree(fbdev);
350 return NULL;
351}
352
353void omap_fbdev_free(struct drm_device *dev)
354{
355 struct omap_drm_private *priv = dev->dev_private;
356 struct drm_fb_helper *helper = priv->fbdev;
357 struct omap_fbdev *fbdev;
358 struct fb_info *fbi;
359
360 DBG();
361
362 fbi = helper->fbdev;
363
364 /* only cleanup framebuffer if it is present */
365 if (fbi) {
366 unregister_framebuffer(fbi);
367 framebuffer_release(fbi);
368 }
369
370 drm_fb_helper_fini(helper);
371
372 fbdev = to_omap_fbdev(priv->fbdev);
373
374 /* release the ref taken in omap_fbdev_create() */
375 omap_gem_put_paddr(fbdev->bo);
376
377 /* this will free the backing object */
378 if (fbdev->fb) {
379 drm_framebuffer_unregister_private(fbdev->fb);
380 drm_framebuffer_remove(fbdev->fb);
381 }
382
383 kfree(fbdev);
384
385 priv->fbdev = NULL;
386}