drivers/video/bcm2835.c

   1 /*
   2  * (C) Copyright 2012 Stephen Warren
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <video.h>
  10 #include <asm/arch/mbox.h>
  11 #include <asm/arch/msg.h>
  12
  13 static int bcm2835_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         int ret;
  18         int w, h, pitch;
  19         ulong fb_base, fb_size, fb_start, fb_end;
  20
  21         debug("bcm2835: Query resolution...\n");
  22         ret = bcm2835_get_video_size(&w, &h);
  23         if (ret)
  24                 return -EIO;
  25
  26         debug("bcm2835: Setting up display for %d x %d\n", w, h);
  27         ret = bcm2835_set_video_params(&w, &h, 32, BCM2835_MBOX_PIXEL_ORDER_RGB,
  28                                        BCM2835_MBOX_ALPHA_MODE_IGNORED,
  29                                        &fb_base, &fb_size, &pitch);
  30
  31         debug("bcm2835: Final resolution is %d x %d\n", w, h);
  32
  33         /* Enable dcache for the frame buffer */
  34         fb_start = fb_base & ~(MMU_SECTION_SIZE - 1);
  35         fb_end = fb_base + fb_size;
  36         fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
  37         mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
  38                                         DCACHE_WRITEBACK);
  39         video_set_flush_dcache(dev, true);
  40
  41         uc_priv->xsize = w;
  42         uc_priv->ysize = h;
  43         uc_priv->bpix = VIDEO_BPP32;
  44         plat->base = fb_base;
  45         plat->size = fb_size;
  46
  47         return 0;
  48 }
  49
  50 static const struct udevice_id bcm2835_video_ids[] = {
  51         { .compatible = "brcm,bcm2835-hdmi" },
  52         { }
  53 };
  54
  55 U_BOOT_DRIVER(bcm2835_video) = {
  56         .name   = "bcm2835_video",
  57         .id     = UCLASS_VIDEO,
  58         .of_match = bcm2835_video_ids,
  59         .probe  = bcm2835_video_probe,
  60 };