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         sizes->surface_bpp = 32;
  97         sizes->surface_depth = 24;
  98
  99         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
 100                         sizes->surface_height, sizes->surface_bpp,
 101                         sizes->fb_width, sizes->fb_height);
 102
 103         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 104                         sizes->surface_depth);
 105
 106         mode_cmd.width = sizes->surface_width;
 107         mode_cmd.height = sizes->surface_height;
 108
 109         mode_cmd.pitches[0] = align_pitch(
 110                         mode_cmd.width, sizes->surface_bpp);
 111
 112         /* allocate backing bo */
 113         size = mode_cmd.pitches[0] * mode_cmd.height;
 114         DBG("allocating %d bytes for fb %d", size, dev->primary->index);
 115         mutex_lock(&dev->struct_mutex);
 116         fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC);
 117         mutex_unlock(&dev->struct_mutex);
 118         if (IS_ERR(fbdev->bo)) {
 119                 ret = PTR_ERR(fbdev->bo);
 120                 fbdev->bo = NULL;
 121                 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
 122                 goto fail;
 123         }
 124
 125         fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
 126         if (IS_ERR(fb)) {
 127                 dev_err(dev->dev, "failed to allocate fb\n");
 128                 /* note: if fb creation failed, we can't rely on fb destroy
 129                  * to unref the bo:
 130                  */
 131                 drm_gem_object_unreference(fbdev->bo);
 132                 ret = PTR_ERR(fb);
 133                 goto fail;
 134         }
 135
 136         mutex_lock(&dev->struct_mutex);
 137
 138         /*
 139          * NOTE: if we can be guaranteed to be able to map buffer
 140          * in panic (ie. lock-safe, etc) we could avoid pinning the
 141          * buffer now:
 142          */
 143         ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
 144         if (ret) {
 145                 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 146                 goto fail_unlock;
 147         }
 148
 149         fbi = framebuffer_alloc(0, dev->dev);
 150         if (!fbi) {
 151                 dev_err(dev->dev, "failed to allocate fb info\n");
 152                 ret = -ENOMEM;
 153                 goto fail_unlock;
 154         }
 155
 156         DBG("fbi=%p, dev=%p", fbi, dev);
 157
 158         fbdev->fb = fb;
 159         helper->fb = fb;
 160         helper->fbdev = fbi;
 161
 162         fbi->par = helper;
 163         fbi->flags = FBINFO_DEFAULT;
 164         fbi->fbops = &msm_fb_ops;
 165
 166         strcpy(fbi->fix.id, "msm");
 167
 168         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 169         if (ret) {
 170                 ret = -ENOMEM;
 171                 goto fail_unlock;
 172         }
 173
 174         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
 175         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 176
 177         dev->mode_config.fb_base = paddr;
 178
 179         fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo);
 180         fbi->screen_size = fbdev->bo->size;
 181         fbi->fix.smem_start = paddr;
 182         fbi->fix.smem_len = fbdev->bo->size;
 183
 184         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 185         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 186
 187         mutex_unlock(&dev->struct_mutex);
 188
 189         return 0;
 190
 191 fail_unlock:
 192         mutex_unlock(&dev->struct_mutex);
 193 fail:
 194
 195         if (ret) {
 196                 if (fbi)
 197                         framebuffer_release(fbi);
 198                 if (fb) {
 199                         drm_framebuffer_unregister_private(fb);
 200                         drm_framebuffer_remove(fb);
 201                 }
 202         }
 203
 204         return ret;
 205 }
 206
 207 static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc,
 208                 u16 red, u16 green, u16 blue, int regno)
 209 {
 210         DBG("fbdev: set gamma");
 211 }
 212
 213 static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc,
 214                 u16 *red, u16 *green, u16 *blue, int regno)
 215 {
 216         DBG("fbdev: get gamma");
 217 }
 218
 219 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 220         .gamma_set = msm_crtc_fb_gamma_set,
 221         .gamma_get = msm_crtc_fb_gamma_get,
 222         .fb_probe = msm_fbdev_create,
 223 };
 224
 225 /* initialize fbdev helper */
 226 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 227 {
 228         struct msm_drm_private *priv = dev->dev_private;
 229         struct msm_fbdev *fbdev = NULL;
 230         struct drm_fb_helper *helper;
 231         int ret;
 232
 233         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 234         if (!fbdev)
 235                 goto fail;
 236
 237         helper = &fbdev->base;
 238
 239         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 240
 241         ret = drm_fb_helper_init(dev, helper,
 242                         priv->num_crtcs, priv->num_connectors);
 243         if (ret) {
 244                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 245                 goto fail;
 246         }
 247
 248         drm_fb_helper_single_add_all_connectors(helper);
 249
 250         /* disable all the possible outputs/crtcs before entering KMS mode */
 251         drm_helper_disable_unused_functions(dev);
 252
 253         drm_fb_helper_initial_config(helper, 32);
 254
 255         priv->fbdev = helper;
 256
 257         return helper;
 258
 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 }