LXR linux/arch/powerpc/kernel/dma-swiotlb.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Contains routines needed to support swiotlb for ppc.
   4 *
   5 * Copyright (C) 2009-2010 Freescale Semiconductor, Inc.
   6 * Author: Becky Bruce
   7 */
   8#include <linux/memblock.h>
   9#include <asm/machdep.h>
  10#include <asm/swiotlb.h>
  11
  12unsigned int ppc_swiotlb_enable;
  13
  14void __init swiotlb_detect_4g(void)
  15{
  16        if ((memblock_end_of_DRAM() - 1) > 0xffffffff)
  17                ppc_swiotlb_enable = 1;
  18}
  19
  20static int __init check_swiotlb_enabled(void)
  21{
  22        if (ppc_swiotlb_enable)
  23                swiotlb_print_info();
  24        else
  25                swiotlb_exit();
  26
  27        return 0;
  28}
  29subsys_initcall(check_swiotlb_enabled);
  30