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         struct drm_device *dev = helper->dev;
  66         int ret = 0;
  67
  68         ret = drm_gem_mmap_obj(drm_obj, drm_obj->size, vma);
  69         if (ret) {
  70                 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
  71                 return ret;
  72         }
  73
  74         return msm_gem_mmap_obj(drm_obj, vma);
  75 }
  76
  77 static int msm_fbdev_create(struct drm_fb_helper *helper,
  78                 struct drm_fb_helper_surface_size *sizes)
  79 {
  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};
  85         uint32_t paddr;
  86         int ret, size;
  87
  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);
  91
  92         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  93                         sizes->surface_depth);
  94
  95         mode_cmd.width = sizes->surface_width;
  96         mode_cmd.height = sizes->surface_height;
  97
  98         mode_cmd.pitches[0] = align_pitch(
  99                         mode_cmd.width, sizes->surface_bpp);
 100
 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);
 110                 fbdev->bo = NULL;
 111                 dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret);
 112                 goto fail;
 113         }
 114
 115         fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
 116         if (IS_ERR(fb)) {
 117                 dev_err(dev->dev, "failed to allocate fb\n");
 118                 /* note: if fb creation failed, we can't rely on fb destroy
 119                  * to unref the bo:
 120                  */
 121                 drm_gem_object_unreference_unlocked(fbdev->bo);
 122                 ret = PTR_ERR(fb);
 123                 goto fail;
 124         }
 125
 126         mutex_lock(&dev->struct_mutex);
 127
 128         /*
 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
 131          * buffer now:
 132          */
 133         ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr);
 134         if (ret) {
 135                 dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 136                 goto fail_unlock;
 137         }
 138
 139         fbi = drm_fb_helper_alloc_fbi(helper);
 140         if (IS_ERR(fbi)) {
 141                 dev_err(dev->dev, "failed to allocate fb info\n");
 142                 ret = PTR_ERR(fbi);
 143                 goto fail_unlock;
 144         }
 145
 146         DBG("fbi=%p, dev=%p", fbi, dev);
 147
 148         fbdev->fb = fb;
 149         helper->fb = fb;
 150
 151         fbi->par = helper;
 152         fbi->flags = FBINFO_DEFAULT;
 153         fbi->fbops = &msm_fb_ops;
 154
 155         strcpy(fbi->fix.id, "msm");
 156
 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);
 159
 160         dev->mode_config.fb_base = paddr;
 161
 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;
 166
 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);
 169
 170         mutex_unlock(&dev->struct_mutex);
 171
 172         return 0;
 173
 174 fail_unlock:
 175         mutex_unlock(&dev->struct_mutex);
 176 fail:
 177
 178         if (ret) {
 179                 if (fb) {
 180                         drm_framebuffer_unregister_private(fb);
 181                         drm_framebuffer_remove(fb);
 182                 }
 183         }
 184
 185         return ret;
 186 }
 187
 188 static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc,
 189                 u16 red, u16 green, u16 blue, int regno)
 190 {
 191         DBG("fbdev: set gamma");
 192 }
 193
 194 static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc,
 195                 u16 *red, u16 *green, u16 *blue, int regno)
 196 {
 197         DBG("fbdev: get gamma");
 198 }
 199
 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,
 204 };
 205
 206 /* initialize fbdev helper */
 207 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 208 {
 209         struct msm_drm_private *priv = dev->dev_private;
 210         struct msm_fbdev *fbdev = NULL;
 211         struct drm_fb_helper *helper;
 212         int ret;
 213
 214         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 215         if (!fbdev)
 216                 goto fail;
 217
 218         helper = &fbdev->base;
 219
 220         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 221
 222         ret = drm_fb_helper_init(dev, helper,
 223                         priv->num_crtcs, priv->num_connectors);
 224         if (ret) {
 225                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 226                 goto fail;
 227         }
 228
 229         ret = drm_fb_helper_single_add_all_connectors(helper);
 230         if (ret)
 231                 goto fini;
 232
 233         ret = drm_fb_helper_initial_config(helper, 32);
 234         if (ret)
 235                 goto fini;
 236
 237         priv->fbdev = helper;
 238
 239         return helper;
 240
 241 fini:
 242         drm_fb_helper_fini(helper);
 243 fail:
 244         kfree(fbdev);
 245         return NULL;
 246 }
 247
 248 void msm_fbdev_free(struct drm_device *dev)
 249 {
 250         struct msm_drm_private *priv = dev->dev_private;
 251         struct drm_fb_helper *helper = priv->fbdev;
 252         struct msm_fbdev *fbdev;
 253
 254         DBG();
 255
 256         drm_fb_helper_unregister_fbi(helper);
 257         drm_fb_helper_release_fbi(helper);
 258
 259         drm_fb_helper_fini(helper);
 260
 261         fbdev = to_msm_fbdev(priv->fbdev);
 262
 263         /* this will free the backing object */
 264         if (fbdev->fb) {
 265                 drm_framebuffer_unregister_private(fbdev->fb);
 266                 drm_framebuffer_remove(fbdev->fb);
 267         }
 268
 269         kfree(fbdev);
 270
 271         priv->fbdev = NULL;
 272 }