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 "msm_drv.h"
  19
  20 #include "drm_crtc.h"
  21 #include "drm_fb_helper.h"
  22 #include "msm_gem.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         struct drm_gem_object *bo;
  38 };
  39
  40 static struct fb_ops msm_fb_ops = {
  41         .owner = THIS_MODULE,
  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         .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,
  58 };
  59
  60 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
  61 {
  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         int ret = 0;
  66
  67         ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
  68         if (ret) {
  69                 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
  70                 return ret;
  71         }
  72
  73         return msm_gem_mmap_obj(drm_obj, vma);
  74 }
  75
  76 static int msm_fbdev_create(struct drm_fb_helper *helper,
  77                 struct drm_fb_helper_surface_size *sizes)
  78 {
  79         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  80         struct drm_device *dev = helper->dev;
  81         struct drm_framebuffer *fb = NULL;
  82         struct fb_info *fbi = NULL;
  83         struct drm_mode_fb_cmd2 mode_cmd = {0};
  84         uint32_t paddr;
  85         int ret, size;
  86
  87         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  88                         sizes->surface_height, sizes->surface_bpp,
  89                         sizes->fb_width, sizes->fb_height);
  90
  91         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  92                         sizes->surface_depth);
  93
  94         mode_cmd.width = sizes->surface_width;
  95         mode_cmd.height = sizes->surface_height;
  96
  97         mode_cmd.pitches[0] = align_pitch(
  98                         mode_cmd.width, sizes->surface_bpp);
  99
 100         /* allocate backing bo */
 101         size = mode_cmd.pitches[0] * mode_cmd.height;
 102         DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 103         mutex_lock(&dev->struct_mutex);
 104         fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT |
 105                         MSM_BO_WC | MSM_BO_STOLEN);
 106         mutex_unlock(&dev->struct_mutex);
 107         if (IS_ERR(fbdev->bo)) {
 108                 ret = PTR_ERR(fbdev->bo);
 109                 fbdev->bo = NULL;
 110                 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
 111                 goto fail;
 112         }
 113
 114         fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
 115         if (IS_ERR(fb)) {
 116                 dev_err(dev->dev, "failed to allocate fb\n");
 117                 /* note: if fb creation failed, we can't rely on fb destroy
 118                  * to unref the bo:
 119                  */
 120                 drm_gem_object_unreference_unlocked(fbdev->bo);
 121                 ret = PTR_ERR(fb);
 122                 goto fail;
 123         }
 124
 125         mutex_lock(&dev->struct_mutex);
 126
 127         /*
 128          * NOTE: if we can be guaranteed to be able to map buffer
 129          * in panic (ie. lock-safe, etc) we could avoid pinning the
 130          * buffer now:
 131          */
 132         ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
 133         if (ret) {
 134                 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 135                 goto fail_unlock;
 136         }
 137
 138         fbi = drm_fb_helper_alloc_fbi(helper);
 139         if (IS_ERR(fbi)) {
 140                 dev_err(dev->dev, "failed to allocate fb info\n");
 141                 ret = PTR_ERR(fbi);
 142                 goto fail_unlock;
 143         }
 144
 145         DBG("fbi=%p, dev=%p", fbi, dev);
 146
 147         fbdev->fb = fb;
 148         helper->fb = fb;
 149
 150         fbi->par = helper;
 151         fbi->flags = FBINFO_DEFAULT;
 152         fbi->fbops = &msm_fb_ops;
 153
 154         strcpy(fbi->fix.id, "msm");
 155
 156         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
 157         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 158
 159         dev->mode_config.fb_base = paddr;
 160
 161         fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo);
 162         if (IS_ERR(fbi->screen_base)) {
 163                 ret = PTR_ERR(fbi->screen_base);
 164                 goto fail_unlock;
 165         }
 166         fbi->screen_size = fbdev->bo->size;
 167         fbi->fix.smem_start = paddr;
 168         fbi->fix.smem_len = fbdev->bo->size;
 169
 170         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 171         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 172
 173         mutex_unlock(&dev->struct_mutex);
 174
 175         return 0;
 176
 177 fail_unlock:
 178         mutex_unlock(&dev->struct_mutex);
 179 fail:
 180
 181         if (ret) {
 182                 if (fb) {
 183                         drm_framebuffer_unregister_private(fb);
 184                         drm_framebuffer_remove(fb);
 185                 }
 186         }
 187
 188         return ret;
 189 }
 190
 191 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 192         .fb_probe = msm_fbdev_create,
 193 };
 194
 195 /* initialize fbdev helper */
 196 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 197 {
 198         struct msm_drm_private *priv = dev->dev_private;
 199         struct msm_fbdev *fbdev = NULL;
 200         struct drm_fb_helper *helper;
 201         int ret;
 202
 203         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 204         if (!fbdev)
 205                 goto fail;
 206
 207         helper = &fbdev->base;
 208
 209         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 210
 211         ret = drm_fb_helper_init(dev, helper,
 212                         priv->num_crtcs, priv->num_connectors);
 213         if (ret) {
 214                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 215                 goto fail;
 216         }
 217
 218         ret = drm_fb_helper_single_add_all_connectors(helper);
 219         if (ret)
 220                 goto fini;
 221
 222         ret = drm_fb_helper_initial_config(helper, 32);
 223         if (ret)
 224                 goto fini;
 225
 226         priv->fbdev = helper;
 227
 228         return helper;
 229
 230 fini:
 231         drm_fb_helper_fini(helper);
 232 fail:
 233         kfree(fbdev);
 234         return NULL;
 235 }
 236
 237 void msm_fbdev_free(struct drm_device *dev)
 238 {
 239         struct msm_drm_private *priv = dev->dev_private;
 240         struct drm_fb_helper *helper = priv->fbdev;
 241         struct msm_fbdev *fbdev;
 242
 243         DBG();
 244
 245         drm_fb_helper_unregister_fbi(helper);
 246         drm_fb_helper_release_fbi(helper);
 247
 248         drm_fb_helper_fini(helper);
 249
 250         fbdev = to_msm_fbdev(priv->fbdev);
 251
 252         /* this will free the backing object */
 253         if (fbdev->fb) {
 254                 drm_framebuffer_unregister_private(fbdev->fb);
 255                 drm_framebuffer_remove(fbdev->fb);
 256         }
 257
 258         kfree(fbdev);
 259
 260         priv->fbdev = NULL;
 261 }