2 * Copyright (C) 2013 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "drm_fb_helper.h"
24 extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
25 struct vm_area_struct *vma);
26 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
29 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
32 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
35 struct drm_fb_helper base;
36 struct drm_framebuffer *fb;
37 struct drm_gem_object *bo;
40 static struct fb_ops msm_fb_ops = {
43 /* Note: to properly handle manual update displays, we wrap the
44 * basic fbdev ops which write to the framebuffer
46 .fb_read = drm_fb_helper_sys_read,
47 .fb_write = drm_fb_helper_sys_write,
48 .fb_fillrect = drm_fb_helper_sys_fillrect,
49 .fb_copyarea = drm_fb_helper_sys_copyarea,
50 .fb_imageblit = drm_fb_helper_sys_imageblit,
51 .fb_mmap = msm_fbdev_mmap,
53 .fb_check_var = drm_fb_helper_check_var,
54 .fb_set_par = drm_fb_helper_set_par,
55 .fb_pan_display = drm_fb_helper_pan_display,
56 .fb_blank = drm_fb_helper_blank,
57 .fb_setcmap = drm_fb_helper_setcmap,
60 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
62 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
63 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
64 struct drm_gem_object *drm_obj = fbdev->bo;
65 struct drm_device *dev = helper->dev;
68 ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
70 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
74 return msm_gem_mmap_obj(drm_obj, vma);
77 static int msm_fbdev_create(struct drm_fb_helper *helper,
78 struct drm_fb_helper_surface_size *sizes)
80 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
81 struct drm_device *dev = helper->dev;
82 struct drm_framebuffer *fb = NULL;
83 struct fb_info *fbi = NULL;
84 struct drm_mode_fb_cmd2 mode_cmd = {0};
88 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
89 sizes->surface_height, sizes->surface_bpp,
90 sizes->fb_width, sizes->fb_height);
92 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
93 sizes->surface_depth);
95 mode_cmd.width = sizes->surface_width;
96 mode_cmd.height = sizes->surface_height;
98 mode_cmd.pitches[0] = align_pitch(
99 mode_cmd.width, sizes->surface_bpp);
101 /* allocate backing bo */
102 size = mode_cmd.pitches[0] * mode_cmd.height;
103 DBG("allocating %d bytes for fb %d", size, dev->primary->index);
104 mutex_lock(&dev->struct_mutex);
105 fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT |
106 MSM_BO_WC | MSM_BO_STOLEN);
107 mutex_unlock(&dev->struct_mutex);
108 if (IS_ERR(fbdev->bo)) {
109 ret = PTR_ERR(fbdev->bo);
111 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
115 fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
117 dev_err(dev->dev, "failed to allocate fb\n");
118 /* note: if fb creation failed, we can't rely on fb destroy
121 drm_gem_object_unreference_unlocked(fbdev->bo);
126 mutex_lock(&dev->struct_mutex);
129 * NOTE: if we can be guaranteed to be able to map buffer
130 * in panic (ie. lock-safe, etc) we could avoid pinning the
133 ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
135 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
139 fbi = drm_fb_helper_alloc_fbi(helper);
141 dev_err(dev->dev, "failed to allocate fb info\n");
146 DBG("fbi=%p, dev=%p", fbi, dev);
152 fbi->flags = FBINFO_DEFAULT;
153 fbi->fbops = &msm_fb_ops;
155 strcpy(fbi->fix.id, "msm");
157 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
158 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
160 dev->mode_config.fb_base = paddr;
162 fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo);
163 fbi->screen_size = fbdev->bo->size;
164 fbi->fix.smem_start = paddr;
165 fbi->fix.smem_len = fbdev->bo->size;
167 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
168 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
170 mutex_unlock(&dev->struct_mutex);
175 mutex_unlock(&dev->struct_mutex);
180 drm_framebuffer_unregister_private(fb);
181 drm_framebuffer_remove(fb);
188 static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc,
189 u16 red, u16 green, u16 blue, int regno)
191 DBG("fbdev: set gamma");
194 static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc,
195 u16 *red, u16 *green, u16 *blue, int regno)
197 DBG("fbdev: get gamma");
200 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
201 .gamma_set = msm_crtc_fb_gamma_set,
202 .gamma_get = msm_crtc_fb_gamma_get,
203 .fb_probe = msm_fbdev_create,
206 /* initialize fbdev helper */
207 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
209 struct msm_drm_private *priv = dev->dev_private;
210 struct msm_fbdev *fbdev = NULL;
211 struct drm_fb_helper *helper;
214 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
218 helper = &fbdev->base;
220 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
222 ret = drm_fb_helper_init(dev, helper,
223 priv->num_crtcs, priv->num_connectors);
225 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
229 ret = drm_fb_helper_single_add_all_connectors(helper);
233 ret = drm_fb_helper_initial_config(helper, 32);
237 priv->fbdev = helper;
242 drm_fb_helper_fini(helper);
248 void msm_fbdev_free(struct drm_device *dev)
250 struct msm_drm_private *priv = dev->dev_private;
251 struct drm_fb_helper *helper = priv->fbdev;
252 struct msm_fbdev *fbdev;
256 drm_fb_helper_unregister_fbi(helper);
257 drm_fb_helper_release_fbi(helper);
259 drm_fb_helper_fini(helper);
261 fbdev = to_msm_fbdev(priv->fbdev);
263 /* this will free the backing object */
265 drm_framebuffer_unregister_private(fbdev->fb);
266 drm_framebuffer_remove(fbdev->fb);