drivers/gpu/drm/msm/msm_fbdev.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   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.
   8  *
   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
  12  * more details.
  13  *
  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/>.
  16  */
  17
  18 #include <drm/drm_crtc.h>
  19 #include <drm/drm_fb_helper.h>
  20
  21 #include "msm_drv.h"
  22 #include "msm_kms.h"
  23
  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);
  27
  28 /*
  29  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  30  */
  31
  32 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
  33
  34 struct msm_fbdev {
  35         struct drm_fb_helper base;
  36         struct drm_framebuffer *fb;
  37 };
  38
  39 static struct fb_ops msm_fb_ops = {
  40         .owner = THIS_MODULE,
  41         DRM_FB_HELPER_DEFAULT_OPS,
  42
  43         /* Note: to properly handle manual update displays, we wrap the
  44          * basic fbdev ops which write to the framebuffer
  45          */
  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,
  52 };
  53
  54 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
  55 {
  56         struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
  57         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  58         struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
  59         int ret = 0;
  60
  61         ret = drm_gem_mmap_obj(bo, bo->size, vma);
  62         if (ret) {
  63                 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
  64                 return ret;
  65         }
  66
  67         return msm_gem_mmap_obj(bo, vma);
  68 }
  69
  70 static int msm_fbdev_create(struct drm_fb_helper *helper,
  71                 struct drm_fb_helper_surface_size *sizes)
  72 {
  73         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  74         struct drm_device *dev = helper->dev;
  75         struct msm_drm_private *priv = dev->dev_private;
  76         struct drm_framebuffer *fb = NULL;
  77         struct drm_gem_object *bo;
  78         struct fb_info *fbi = NULL;
  79         uint64_t paddr;
  80         uint32_t format;
  81         int ret, pitch;
  82
  83         format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
  84
  85         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  86                         sizes->surface_height, sizes->surface_bpp,
  87                         sizes->fb_width, sizes->fb_height);
  88
  89         pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
  90         fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
  91                         sizes->surface_height, pitch, format);
  92
  93         if (IS_ERR(fb)) {
  94                 dev_err(dev->dev, "failed to allocate fb\n");
  95                 ret = PTR_ERR(fb);
  96                 goto fail;
  97         }
  98
  99         bo = msm_framebuffer_bo(fb, 0);
 100
 101         mutex_lock(&dev->struct_mutex);
 102
 103         /*
 104          * NOTE: if we can be guaranteed to be able to map buffer
 105          * in panic (ie. lock-safe, etc) we could avoid pinning the
 106          * buffer now:
 107          */
 108         ret = msm_gem_get_iova(bo, priv->kms->aspace, &paddr);
 109         if (ret) {
 110                 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 111                 goto fail_unlock;
 112         }
 113
 114         fbi = drm_fb_helper_alloc_fbi(helper);
 115         if (IS_ERR(fbi)) {
 116                 dev_err(dev->dev, "failed to allocate fb info\n");
 117                 ret = PTR_ERR(fbi);
 118                 goto fail_unlock;
 119         }
 120
 121         DBG("fbi=%p, dev=%p", fbi, dev);
 122
 123         fbdev->fb = fb;
 124         helper->fb = fb;
 125
 126         fbi->par = helper;
 127         fbi->fbops = &msm_fb_ops;
 128
 129         strcpy(fbi->fix.id, "msm");
 130
 131         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
 132         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 133
 134         dev->mode_config.fb_base = paddr;
 135
 136         fbi->screen_base = msm_gem_get_vaddr(bo);
 137         if (IS_ERR(fbi->screen_base)) {
 138                 ret = PTR_ERR(fbi->screen_base);
 139                 goto fail_unlock;
 140         }
 141         fbi->screen_size = bo->size;
 142         fbi->fix.smem_start = paddr;
 143         fbi->fix.smem_len = bo->size;
 144
 145         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 146         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 147
 148         mutex_unlock(&dev->struct_mutex);
 149
 150         return 0;
 151
 152 fail_unlock:
 153         mutex_unlock(&dev->struct_mutex);
 154 fail:
 155
 156         if (ret) {
 157                 if (fb)
 158                         drm_framebuffer_remove(fb);
 159         }
 160
 161         return ret;
 162 }
 163
 164 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 165         .fb_probe = msm_fbdev_create,
 166 };
 167
 168 /* initialize fbdev helper */
 169 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 170 {
 171         struct msm_drm_private *priv = dev->dev_private;
 172         struct msm_fbdev *fbdev = NULL;
 173         struct drm_fb_helper *helper;
 174         int ret;
 175
 176         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 177         if (!fbdev)
 178                 goto fail;
 179
 180         helper = &fbdev->base;
 181
 182         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 183
 184         ret = drm_fb_helper_init(dev, helper, priv->num_connectors);
 185         if (ret) {
 186                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 187                 goto fail;
 188         }
 189
 190         ret = drm_fb_helper_single_add_all_connectors(helper);
 191         if (ret)
 192                 goto fini;
 193
 194         ret = drm_fb_helper_initial_config(helper, 32);
 195         if (ret)
 196                 goto fini;
 197
 198         priv->fbdev = helper;
 199
 200         return helper;
 201
 202 fini:
 203         drm_fb_helper_fini(helper);
 204 fail:
 205         kfree(fbdev);
 206         return NULL;
 207 }
 208
 209 void msm_fbdev_free(struct drm_device *dev)
 210 {
 211         struct msm_drm_private *priv = dev->dev_private;
 212         struct drm_fb_helper *helper = priv->fbdev;
 213         struct msm_fbdev *fbdev;
 214
 215         DBG();
 216
 217         drm_fb_helper_unregister_fbi(helper);
 218
 219         drm_fb_helper_fini(helper);
 220
 221         fbdev = to_msm_fbdev(priv->fbdev);
 222
 223         /* this will free the backing object */
 224         if (fbdev->fb) {
 225                 struct drm_gem_object *bo =
 226                         msm_framebuffer_bo(fbdev->fb, 0);
 227                 msm_gem_put_vaddr(bo);
 228                 drm_framebuffer_remove(fbdev->fb);
 229         }
 230
 231         kfree(fbdev);
 232
 233         priv->fbdev = NULL;
 234 }