drivers/video/bcm2835.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2012 Stephen Warren
   4  */
   5
   6 #include <common.h>
   7 #include <dm.h>
   8 #include <video.h>
   9 #include <asm/arch/mbox.h>
  10 #include <asm/arch/msg.h>
  11
  12 static int bcm2835_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         int ret;
  17         int w, h, pitch;
  18         ulong fb_base, fb_size, fb_start, fb_end;
  19
  20         debug("bcm2835: Query resolution...\n");
  21         ret = bcm2835_get_video_size(&w, &h);
  22         if (ret || w == 0 || h == 0)
  23                 return -EIO;
  24
  25         debug("bcm2835: Setting up display for %d x %d\n", w, h);
  26         ret = bcm2835_set_video_params(&w, &h, 32, BCM2835_MBOX_PIXEL_ORDER_RGB,
  27                                        BCM2835_MBOX_ALPHA_MODE_IGNORED,
  28                                        &fb_base, &fb_size, &pitch);
  29         if (ret)
  30                 return -EIO;
  31
  32         debug("bcm2835: Final resolution is %d x %d\n", w, h);
  33
  34         /* Enable dcache for the frame buffer */
  35         fb_start = fb_base & ~(MMU_SECTION_SIZE - 1);
  36         fb_end = fb_base + fb_size;
  37         fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
  38         mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
  39                                         DCACHE_WRITEBACK);
  40         video_set_flush_dcache(dev, true);
  41
  42         uc_priv->xsize = w;
  43         uc_priv->ysize = h;
  44         uc_priv->bpix = VIDEO_BPP32;
  45         plat->base = fb_base;
  46         plat->size = fb_size;
  47
  48         return 0;
  49 }
  50
  51 static const struct udevice_id bcm2835_video_ids[] = {
  52         { .compatible = "brcm,bcm2835-hdmi" },
  53         { .compatible = "brcm,bcm2708-fb" },
  54         { }
  55 };
  56
  57 U_BOOT_DRIVER(bcm2835_video) = {
  58         .name   = "bcm2835_video",
  59         .id     = UCLASS_VIDEO,
  60         .of_match = bcm2835_video_ids,
  61         .probe  = bcm2835_video_probe,
  62 };