drivers/video/bcm2835.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2012 Stephen Warren
   4  */
   5
   6 #include <dm.h>
   7 #include <log.h>
   8 #include <video.h>
   9 #include <asm/arch/mbox.h>
  10 #include <asm/arch/msg.h>
  11 #include <asm/cache.h>
  12
  13 static int bcm2835_video_probe(struct udevice *dev)
  14 {
  15         struct video_uc_plat *plat = dev_get_uclass_plat(dev);
  16         struct video_priv *uc_priv = dev_get_uclass_priv(dev);
  17         int ret;
  18         int w, h, pitch, bpp;
  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 || w == 0 || h == 0)
  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         if (ret)
  31                 return -EIO;
  32
  33         debug("bcm2835: Final resolution is %d x %d\n", w, h);
  34
  35         /* Enable dcache for the frame buffer */
  36         fb_start = fb_base & ~(MMU_SECTION_SIZE - 1);
  37         fb_end = fb_base + fb_size;
  38         fb_end = ALIGN(fb_end, 1 << MMU_SECTION_SHIFT);
  39         mmu_set_region_dcache_behaviour(fb_start, fb_end - fb_start,
  40                                         DCACHE_WRITEBACK);
  41         video_set_flush_dcache(dev, true);
  42
  43         bpp = pitch / w;
  44         switch (bpp) {
  45         case 2:
  46                 uc_priv->bpix = VIDEO_BPP16;
  47                 break;
  48         case 4:
  49                 uc_priv->bpix = VIDEO_BPP32;
  50                 break;
  51         default:
  52                 printf("bcm2835: unexpected bpp %d, pitch %d, width %d\n",
  53                        bpp, pitch, w);
  54                 uc_priv->bpix = VIDEO_BPP32;
  55                 break;
  56         }
  57
  58         uc_priv->xsize = w;
  59         uc_priv->ysize = h;
  60         plat->base = fb_base;
  61         plat->size = fb_size;
  62
  63         return 0;
  64 }
  65
  66 static const struct udevice_id bcm2835_video_ids[] = {
  67         { .compatible = "brcm,bcm2835-hdmi" },
  68         { .compatible = "brcm,bcm2711-hdmi0" },
  69         { .compatible = "brcm,bcm2708-fb" },
  70 #if !IS_ENABLED(CONFIG_VIDEO_DT_SIMPLEFB)
  71         { .compatible = "simple-framebuffer" },
  72 #endif
  73         { }
  74 };
  75
  76 U_BOOT_DRIVER(bcm2835_video) = {
  77         .name   = "bcm2835_video",
  78         .id     = UCLASS_VIDEO,
  79         .of_match = bcm2835_video_ids,
  80         .probe  = bcm2835_video_probe,
  81 };