arch/arm64/mm/dma-mapping.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 ARM Ltd.
   4  * Author: Catalin Marinas <catalin.marinas@arm.com>
   5  */
   6
   7 #include <linux/gfp.h>
   8 #include <linux/cache.h>
   9 #include <linux/dma-map-ops.h>
  10 #include <linux/iommu.h>
  11 #include <xen/xen.h>
  12
  13 #include <asm/cacheflush.h>
  14 #include <asm/xen/xen-ops.h>
  15
  16 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
  17                               enum dma_data_direction dir)
  18 {
  19         unsigned long start = (unsigned long)phys_to_virt(paddr);
  20
  21         dcache_clean_poc(start, start + size);
  22 }
  23
  24 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
  25                            enum dma_data_direction dir)
  26 {
  27         unsigned long start = (unsigned long)phys_to_virt(paddr);
  28
  29         if (dir == DMA_TO_DEVICE)
  30                 return;
  31
  32         dcache_inval_poc(start, start + size);
  33 }
  34
  35 void arch_dma_prep_coherent(struct page *page, size_t size)
  36 {
  37         unsigned long start = (unsigned long)page_address(page);
  38
  39         dcache_clean_poc(start, start + size);
  40 }
  41
  42 #ifdef CONFIG_IOMMU_DMA
  43 void arch_teardown_dma_ops(struct device *dev)
  44 {
  45         dev->dma_ops = NULL;
  46 }
  47 #endif
  48
  49 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
  50                         bool coherent)
  51 {
  52         int cls = cache_line_size_of_cpu();
  53
  54         WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN,
  55                    TAINT_CPU_OUT_OF_SPEC,
  56                    "%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
  57                    dev_driver_string(dev), dev_name(dev),
  58                    ARCH_DMA_MINALIGN, cls);
  59
  60         dev->dma_coherent = coherent;
  61         if (device_iommu_mapped(dev))
  62                 iommu_setup_dma_ops(dev, dma_base, dma_base + size - 1);
  63
  64         xen_setup_dma_ops(dev);
  65 }