drivers/video/simplefb.c

   1 /*
   2  * (C) Copyright 2017 Rob Clark
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <fdtdec.h>
  10 #include <fdt_support.h>
  11 #include <video.h>
  12
  13 static int simple_video_probe(struct udevice *dev)
  14 {
  15         struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
  16         struct video_priv *uc_priv = dev_get_uclass_priv(dev);
  17         const void *blob = gd->fdt_blob;
  18         const int node = dev_of_offset(dev);
  19         const char *format;
  20         fdt_addr_t base;
  21         fdt_size_t size;
  22
  23         base = fdtdec_get_addr_size_auto_parent(blob, dev_of_offset(dev->parent),
  24                         node, "reg", 0, &size, false);
  25         if (base == FDT_ADDR_T_NONE) {
  26                 debug("%s: Failed to decode memory region\n", __func__);
  27                 return -EINVAL;
  28         }
  29
  30         debug("%s: base=%llx, size=%llu\n", __func__, base, size);
  31
  32         /*
  33          * TODO is there some way to reserve the framebuffer
  34          * region so it isn't clobbered?
  35          */
  36         plat->base = base;
  37         plat->size = size;
  38
  39         video_set_flush_dcache(dev, true);
  40
  41         debug("%s: Query resolution...\n", __func__);
  42
  43         uc_priv->xsize = fdtdec_get_uint(blob, node, "width", 0);
  44         uc_priv->ysize = fdtdec_get_uint(blob, node, "height", 0);
  45         uc_priv->rot = 0;
  46
  47         format = fdt_getprop(blob, node, "format", NULL);
  48         debug("%s: %dx%d@%s\n", __func__, uc_priv->xsize, uc_priv->ysize, format);
  49
  50         if (strcmp(format, "r5g6b5") == 0) {
  51                 uc_priv->bpix = VIDEO_BPP16;
  52         } else if (strcmp(format, "a8b8g8r8") == 0) {
  53                 uc_priv->bpix = VIDEO_BPP32;
  54         } else {
  55                 printf("%s: invalid format: %s\n", __func__, format);
  56                 return -EINVAL;
  57         }
  58
  59         return 0;
  60 }
  61
  62 static const struct udevice_id simple_video_ids[] = {
  63         { .compatible = "simple-framebuffer" },
  64         { }
  65 };
  66
  67 U_BOOT_DRIVER(simple_video) = {
  68         .name   = "simple_video",
  69         .id     = UCLASS_VIDEO,
  70         .of_match = simple_video_ids,
  71         .probe  = simple_video_probe,
  72         .flags  = DM_FLAG_PRE_RELOC,
  73 };