2 * drivers/staging/omapdrm/omap_fbdev.c
4 * Copyright (C) 2011 Texas Instruments
5 * Author: Rob Clark <rob@ti.com>
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.
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
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/>.
23 #include "drm_fb_helper.h"
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);
30 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
33 #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
36 struct drm_fb_helper base;
37 struct drm_framebuffer *fb;
38 struct drm_gem_object *bo;
41 /* for deferred dmm roll when getting called in atomic ctx */
42 struct work_struct work;
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);
48 static ssize_t omap_fbdev_write(struct fb_info *fbi, const char __user *buf,
49 size_t count, loff_t *ppos)
53 res = fb_sys_write(fbi, buf, count, ppos);
54 omap_fbdev_flush(fbi, 0, 0, fbi->var.xres, fbi->var.yres);
59 static void omap_fbdev_fillrect(struct fb_info *fbi,
60 const struct fb_fillrect *rect)
62 sys_fillrect(fbi, rect);
63 omap_fbdev_flush(fbi, rect->dx, rect->dy, rect->width, rect->height);
66 static void omap_fbdev_copyarea(struct fb_info *fbi,
67 const struct fb_copyarea *area)
69 sys_copyarea(fbi, area);
70 omap_fbdev_flush(fbi, area->dx, area->dy, area->width, area->height);
73 static void omap_fbdev_imageblit(struct fb_info *fbi,
74 const struct fb_image *image)
76 sys_imageblit(fbi, image);
77 omap_fbdev_flush(fbi, image->dx, image->dy,
78 image->width, image->height);
81 static void pan_worker(struct work_struct *work)
83 struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
84 struct fb_info *fbi = fbdev->base.fbdev;
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);
92 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
95 struct drm_fb_helper *helper = get_fb(fbi);
96 struct omap_fbdev *fbdev = to_omap_fbdev(helper);
101 if (!fbdev->ywrap_enabled)
104 if (drm_can_sleep()) {
105 pan_worker(&fbdev->work);
107 struct omap_drm_private *priv = helper->dev->dev_private;
108 queue_work(priv->wq, &fbdev->work);
114 return drm_fb_helper_pan_display(var, fbi);
117 static struct fb_ops omap_fb_ops = {
118 .owner = THIS_MODULE,
120 /* Note: to properly handle manual update displays, we wrap the
121 * basic fbdev ops which write to the framebuffer
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,
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,
135 .fb_debug_enter = drm_fb_helper_debug_enter,
136 .fb_debug_leave = drm_fb_helper_debug_leave,
139 static int omap_fbdev_create(struct drm_fb_helper *helper,
140 struct drm_fb_helper_surface_size *sizes)
142 struct omap_fbdev *fbdev = to_omap_fbdev(helper);
143 struct drm_device *dev = helper->dev;
144 struct omap_drm_private *priv = dev->dev_private;
145 struct drm_framebuffer *fb = NULL;
146 union omap_gem_size gsize;
147 struct fb_info *fbi = NULL;
148 struct drm_mode_fb_cmd2 mode_cmd = {0};
152 /* only doing ARGB32 since this is what is needed to alpha-blend
153 * with video overlays:
155 sizes->surface_bpp = 32;
156 sizes->surface_depth = 32;
158 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
159 sizes->surface_height, sizes->surface_bpp,
160 sizes->fb_width, sizes->fb_height);
162 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
163 sizes->surface_depth);
165 mode_cmd.width = sizes->surface_width;
166 mode_cmd.height = sizes->surface_height;
168 mode_cmd.pitches[0] = align_pitch(
169 mode_cmd.width * ((sizes->surface_bpp + 7) / 8),
170 mode_cmd.width, sizes->surface_bpp);
172 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
173 if (fbdev->ywrap_enabled) {
174 /* need to align pitch to page size if using DMM scrolling */
175 mode_cmd.pitches[0] = ALIGN(mode_cmd.pitches[0], PAGE_SIZE);
178 /* allocate backing bo */
179 gsize = (union omap_gem_size){
180 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
182 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
183 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
185 dev_err(dev->dev, "failed to allocate buffer object\n");
190 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
192 dev_err(dev->dev, "failed to allocate fb\n");
193 /* note: if fb creation failed, we can't rely on fb destroy
196 drm_gem_object_unreference(fbdev->bo);
201 /* note: this keeps the bo pinned.. which is perhaps not ideal,
202 * but is needed as long as we use fb_mmap() to mmap to userspace
203 * (since this happens using fix.smem_start). Possibly we could
204 * implement our own mmap using GEM mmap support to avoid this
205 * (non-tiled buffer doesn't need to be pinned for fbcon to write
206 * to it). Then we just need to be sure that we are able to re-
207 * pin it in case of an opps.
209 ret = omap_gem_get_paddr(fbdev->bo, &paddr, true);
212 "could not map (paddr)! Skipping framebuffer alloc\n");
217 mutex_lock(&dev->struct_mutex);
219 fbi = framebuffer_alloc(0, dev->dev);
221 dev_err(dev->dev, "failed to allocate fb info\n");
226 DBG("fbi=%p, dev=%p", fbi, dev);
233 fbi->flags = FBINFO_DEFAULT;
234 fbi->fbops = &omap_fb_ops;
236 strcpy(fbi->fix.id, MODULE_NAME);
238 ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
244 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
245 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
247 dev->mode_config.fb_base = paddr;
249 fbi->screen_base = omap_gem_vaddr(fbdev->bo);
250 fbi->screen_size = fbdev->bo->size;
251 fbi->fix.smem_start = paddr;
252 fbi->fix.smem_len = fbdev->bo->size;
254 /* if we have DMM, then we can use it for scrolling by just
255 * shuffling pages around in DMM rather than doing sw blit.
257 if (fbdev->ywrap_enabled) {
258 DRM_INFO("Enabling DMM ywrap scrolling\n");
259 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
260 fbi->fix.ywrapstep = 1;
264 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
265 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
267 mutex_unlock(&dev->struct_mutex);
272 mutex_unlock(&dev->struct_mutex);
277 framebuffer_release(fbi);
279 drm_framebuffer_remove(fb);
285 static void omap_crtc_fb_gamma_set(struct drm_crtc *crtc,
286 u16 red, u16 green, u16 blue, int regno)
288 DBG("fbdev: set gamma");
291 static void omap_crtc_fb_gamma_get(struct drm_crtc *crtc,
292 u16 *red, u16 *green, u16 *blue, int regno)
294 DBG("fbdev: get gamma");
297 static int omap_fbdev_probe(struct drm_fb_helper *helper,
298 struct drm_fb_helper_surface_size *sizes)
304 ret = omap_fbdev_create(helper, sizes);
312 static struct drm_fb_helper_funcs omap_fb_helper_funcs = {
313 .gamma_set = omap_crtc_fb_gamma_set,
314 .gamma_get = omap_crtc_fb_gamma_get,
315 .fb_probe = omap_fbdev_probe,
318 static struct drm_fb_helper *get_fb(struct fb_info *fbi)
320 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
321 /* these are not the fb's you're looking for */
327 /* flush an area of the framebuffer (in case of manual update display that
328 * is not automatically flushed)
330 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h)
332 struct drm_fb_helper *helper = get_fb(fbi);
337 VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi);
339 omap_framebuffer_flush(helper->fb, x, y, w, h);
342 /* initialize fbdev helper */
343 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
345 struct omap_drm_private *priv = dev->dev_private;
346 struct omap_fbdev *fbdev = NULL;
347 struct drm_fb_helper *helper;
350 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
352 dev_err(dev->dev, "could not allocate fbdev\n");
356 INIT_WORK(&fbdev->work, pan_worker);
358 helper = &fbdev->base;
360 helper->funcs = &omap_fb_helper_funcs;
362 ret = drm_fb_helper_init(dev, helper,
363 priv->num_crtcs, priv->num_connectors);
365 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
369 drm_fb_helper_single_add_all_connectors(helper);
370 drm_fb_helper_initial_config(helper, 32);
372 priv->fbdev = helper;
381 void omap_fbdev_free(struct drm_device *dev)
383 struct omap_drm_private *priv = dev->dev_private;
384 struct drm_fb_helper *helper = priv->fbdev;
385 struct omap_fbdev *fbdev;
392 /* only cleanup framebuffer if it is present */
394 unregister_framebuffer(fbi);
395 framebuffer_release(fbi);
398 drm_fb_helper_fini(helper);
400 fbdev = to_omap_fbdev(priv->fbdev);
402 /* this will free the backing object */
404 drm_framebuffer_remove(fbdev->fb);