simplefb.c 1.7 KB

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