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 <log.h>
   9 #include <video.h>
  10 #include <asm/arch/mbox.h>
  11 #include <asm/arch/msg.h>
  12 #include <asm/cache.h>
  13
  14 static int bcm2835_video_probe(struct udevice *dev)
  15 {
  16         struct video_uc_platdata *plat = dev_get_uclass_platdata(dev);
  17         struct video_priv *uc_priv = dev_get_uclass_priv(dev);
  18         int ret;
  19         int w, h, pitch;
  20         ulong fb_base, fb_size, fb_start, fb_end;
  21
  22         debug("bcm2835: Query resolution...\n");
  23         ret = bcm2835_get_video_size(&w, &h);
  24         if (ret || w == 0 || h == 0)
  25                 return -EIO;
  26
  27         debug("bcm2835: Setting up display for %d x %d\n", w, h);
  28         ret = bcm2835_set_video_params(&w, &h, 32, BCM2835_MBOX_PIXEL_ORDER_RGB,
  29                                        BCM2835_MBOX_ALPHA_MODE_IGNORED,
  30                                        &fb_base, &fb_size, &pitch);
  31         if (ret)
  32                 return -EIO;
  33
  34         debug("bcm2835: Final resolution is %d x %d\n", w, h);
  35
  36         /* Enable dcache for the frame buffer */
  37         fb_start = fb_base & ~(MMU_SECTION_SIZE - 1);
  38         fb_end = fb_base + fb_size;
  39         fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
  40         mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
  41                                         DCACHE_WRITEBACK);
  42         video_set_flush_dcache(dev, true);
  43
  44         uc_priv->xsize = w;
  45         uc_priv->ysize = h;
  46         uc_priv->bpix = VIDEO_BPP32;
  47         plat->base = fb_base;
  48         plat->size = fb_size;
  49
  50         return 0;
  51 }
  52
  53 static const struct udevice_id bcm2835_video_ids[] = {
  54         { .compatible = "brcm,bcm2835-hdmi" },
  55         { .compatible = "brcm,bcm2708-fb" },
  56         { }
  57 };
  58
  59 U_BOOT_DRIVER(bcm2835_video) = {
  60         .name   = "bcm2835_video",
  61         .id     = UCLASS_VIDEO,
  62         .of_match = bcm2835_video_ids,
  63         .probe  = bcm2835_video_probe,
  64 };