drivers/video/simplefb.c

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