kernel/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 = fb_sys_read,
  47         .fb_write = fb_sys_write,
  48         .fb_fillrect = sys_fillrect,
  49         .fb_copyarea = sys_copyarea,
  50         .fb_imageblit = 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         struct drm_device *dev = helper->dev;
  66         int ret = 0;
  67
  68         if (drm_device_is_unplugged(dev))
  69                 return -ENODEV;
  70
  71         mutex_lock(&dev->struct_mutex);
  72
  73         ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
  74
  75         mutex_unlock(&dev->struct_mutex);
  76
  77         if (ret) {
  78                 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
  79                 return ret;
  80         }
  81
  82         return msm_gem_mmap_obj(drm_obj, vma);
  83 }
  84
  85 static int msm_fbdev_create(struct drm_fb_helper *helper,
  86                 struct drm_fb_helper_surface_size *sizes)
  87 {
  88         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  89         struct drm_device *dev = helper->dev;
  90         struct drm_framebuffer *fb = NULL;
  91         struct fb_info *fbi = NULL;
  92         struct drm_mode_fb_cmd2 mode_cmd = {0};
  93         uint32_t paddr;
  94         int ret, size;
  95
  96         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  97                         sizes->surface_height, sizes->surface_bpp,
  98                         sizes->fb_width, sizes->fb_height);
  99
 100         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 101                         sizes->surface_depth);
 102
 103         mode_cmd.width = sizes->surface_width;
 104         mode_cmd.height = sizes->surface_height;
 105
 106         mode_cmd.pitches[0] = align_pitch(
 107                         mode_cmd.width, sizes->surface_bpp);
 108
 109         /* allocate backing bo */
 110         size = mode_cmd.pitches[0] * mode_cmd.height;
 111         DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 112         mutex_lock(&dev->struct_mutex);
 113         fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT |
 114                         MSM_BO_WC | MSM_BO_STOLEN);
 115         mutex_unlock(&dev->struct_mutex);
 116         if (IS_ERR(fbdev->bo)) {
 117                 ret = PTR_ERR(fbdev->bo);
 118                 fbdev->bo = NULL;
 119                 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
 120                 goto fail;
 121         }
 122
 123         fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
 124         if (IS_ERR(fb)) {
 125                 dev_err(dev->dev, "failed to allocate fb\n");
 126                 /* note: if fb creation failed, we can't rely on fb destroy
 127                  * to unref the bo:
 128                  */
 129                 drm_gem_object_unreference(fbdev->bo);
 130                 ret = PTR_ERR(fb);
 131                 goto fail;
 132         }
 133
 134         mutex_lock(&dev->struct_mutex);
 135
 136         /*
 137          * NOTE: if we can be guaranteed to be able to map buffer
 138          * in panic (ie. lock-safe, etc) we could avoid pinning the
 139          * buffer now:
 140          */
 141         ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
 142         if (ret) {
 143                 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 144                 goto fail_unlock;
 145         }
 146
 147         fbi = framebuffer_alloc(0, dev->dev);
 148         if (!fbi) {
 149                 dev_err(dev->dev, "failed to allocate fb info\n");
 150                 ret = -ENOMEM;
 151                 goto fail_unlock;
 152         }
 153
 154         DBG("fbi=%p, dev=%p", fbi, dev);
 155
 156         fbdev->fb = fb;
 157         helper->fb = fb;
 158         helper->fbdev = fbi;
 159
 160         fbi->par = helper;
 161         fbi->flags = FBINFO_DEFAULT;
 162         fbi->fbops = &msm_fb_ops;
 163
 164         strcpy(fbi->fix.id, "msm");
 165
 166         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 167         if (ret) {
 168                 ret = -ENOMEM;
 169                 goto fail_unlock;
 170         }
 171
 172         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
 173         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 174
 175         dev->mode_config.fb_base = paddr;
 176
 177         fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo);
 178         fbi->screen_size = fbdev->bo->size;
 179         fbi->fix.smem_start = paddr;
 180         fbi->fix.smem_len = fbdev->bo->size;
 181
 182         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 183         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 184
 185         mutex_unlock(&dev->struct_mutex);
 186
 187         return 0;
 188
 189 fail_unlock:
 190         mutex_unlock(&dev->struct_mutex);
 191 fail:
 192
 193         if (ret) {
 194                 framebuffer_release(fbi);
 195                 if (fb) {
 196                         drm_framebuffer_unregister_private(fb);
 197                         drm_framebuffer_remove(fb);
 198                 }
 199         }
 200
 201         return ret;
 202 }
 203
 204 static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc,
 205                 u16 red, u16 green, u16 blue, int regno)
 206 {
 207         DBG("fbdev: set gamma");
 208 }
 209
 210 static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc,
 211                 u16 *red, u16 *green, u16 *blue, int regno)
 212 {
 213         DBG("fbdev: get gamma");
 214 }
 215
 216 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 217         .gamma_set = msm_crtc_fb_gamma_set,
 218         .gamma_get = msm_crtc_fb_gamma_get,
 219         .fb_probe = msm_fbdev_create,
 220 };
 221
 222 /* initialize fbdev helper */
 223 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 224 {
 225         struct msm_drm_private *priv = dev->dev_private;
 226         struct msm_fbdev *fbdev = NULL;
 227         struct drm_fb_helper *helper;
 228         int ret;
 229
 230         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 231         if (!fbdev)
 232                 goto fail;
 233
 234         helper = &fbdev->base;
 235
 236         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 237
 238         ret = drm_fb_helper_init(dev, helper,
 239                         priv->num_crtcs, priv->num_connectors);
 240         if (ret) {
 241                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 242                 goto fail;
 243         }
 244
 245         ret = drm_fb_helper_single_add_all_connectors(helper);
 246         if (ret)
 247                 goto fini;
 248
 249         ret = drm_fb_helper_initial_config(helper, 32);
 250         if (ret)
 251                 goto fini;
 252
 253         priv->fbdev = helper;
 254
 255         return helper;
 256
 257 fini:
 258         drm_fb_helper_fini(helper);
 259 fail:
 260         kfree(fbdev);
 261         return NULL;
 262 }
 263
 264 void msm_fbdev_free(struct drm_device *dev)
 265 {
 266         struct msm_drm_private *priv = dev->dev_private;
 267         struct drm_fb_helper *helper = priv->fbdev;
 268         struct msm_fbdev *fbdev;
 269         struct fb_info *fbi;
 270
 271         DBG();
 272
 273         fbi = helper->fbdev;
 274
 275         /* only cleanup framebuffer if it is present */
 276         if (fbi) {
 277                 unregister_framebuffer(fbi);
 278                 framebuffer_release(fbi);
 279         }
 280
 281         drm_fb_helper_fini(helper);
 282
 283         fbdev = to_msm_fbdev(priv->fbdev);
 284
 285         /* this will free the backing object */
 286         if (fbdev->fb) {
 287                 drm_framebuffer_unregister_private(fbdev->fb);
 288                 drm_framebuffer_remove(fbdev->fb);
 289         }
 290
 291         kfree(fbdev);
 292
 293         priv->fbdev = NULL;
 294 }