drivers/staging/imx-drm/imx-fbdev.c

   1 /*
   2  * i.MX drm driver
   3  *
   4  * Copyright (C) 2012 Sascha Hauer, Pengutronix
   5  *
   6  * Based on Samsung Exynos code
   7  *
   8  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  */
  20 #include <linux/module.h>
  21 #include <drm/drmP.h>
  22 #include <drm/drm_crtc.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <drm/drm_fb_cma_helper.h>
  25
  26 #include "imx-drm.h"
  27
  28 #define MAX_CONNECTOR           4
  29 #define PREFERRED_BPP           16
  30
  31 static struct drm_fbdev_cma *fbdev_cma;
  32
  33 static int legacyfb_depth = 16;
  34
  35 module_param(legacyfb_depth, int, 0444);
  36
  37 static int __init imx_fb_helper_init(void)
  38 {
  39         struct drm_device *drm = imx_drm_device_get();
  40
  41         if (!drm)
  42                 return -EINVAL;
  43
  44         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
  45                 pr_warn("i.MX legacyfb: invalid legacyfb_depth setting. defaulting to 16bpp\n");
  46                 legacyfb_depth = 16;
  47         }
  48
  49         fbdev_cma = drm_fbdev_cma_init(drm, legacyfb_depth,
  50                         drm->mode_config.num_crtc, MAX_CONNECTOR);
  51
  52         if (IS_ERR(fbdev_cma)) {
  53                 imx_drm_device_put();
  54                 return PTR_ERR(fbdev_cma);
  55         }
  56
  57         imx_drm_fb_helper_set(fbdev_cma);
  58
  59         return 0;
  60 }
  61
  62 static void __exit imx_fb_helper_exit(void)
  63 {
  64         imx_drm_fb_helper_set(NULL);
  65         drm_fbdev_cma_fini(fbdev_cma);
  66         imx_drm_device_put();
  67 }
  68
  69 late_initcall(imx_fb_helper_init);
  70 module_exit(imx_fb_helper_exit);
  71
  72 MODULE_DESCRIPTION("Freescale i.MX legacy fb driver");
  73 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
  74 MODULE_LICENSE("GPL");