808 строки
24 KiB
C
808 строки
24 KiB
C
#ifndef _LINUX_DMA_MAPPING_H
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#define _LINUX_DMA_MAPPING_H
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#include <linux/sizes.h>
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#include <linux/string.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/dma-debug.h>
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#include <linux/dma-direction.h>
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#include <linux/scatterlist.h>
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#include <linux/kmemcheck.h>
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#include <linux/bug.h>
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/**
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* List of possible attributes associated with a DMA mapping. The semantics
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* of each attribute should be defined in Documentation/DMA-attributes.txt.
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*
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* DMA_ATTR_WRITE_BARRIER: DMA to a memory region with this attribute
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* forces all pending DMA writes to complete.
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*/
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#define DMA_ATTR_WRITE_BARRIER (1UL << 0)
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/*
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* DMA_ATTR_WEAK_ORDERING: Specifies that reads and writes to the mapping
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* may be weakly ordered, that is that reads and writes may pass each other.
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*/
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#define DMA_ATTR_WEAK_ORDERING (1UL << 1)
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/*
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* DMA_ATTR_WRITE_COMBINE: Specifies that writes to the mapping may be
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* buffered to improve performance.
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*/
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#define DMA_ATTR_WRITE_COMBINE (1UL << 2)
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/*
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* DMA_ATTR_NON_CONSISTENT: Lets the platform to choose to return either
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* consistent or non-consistent memory as it sees fit.
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*/
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#define DMA_ATTR_NON_CONSISTENT (1UL << 3)
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/*
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* DMA_ATTR_NO_KERNEL_MAPPING: Lets the platform to avoid creating a kernel
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* virtual mapping for the allocated buffer.
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*/
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#define DMA_ATTR_NO_KERNEL_MAPPING (1UL << 4)
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/*
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* DMA_ATTR_SKIP_CPU_SYNC: Allows platform code to skip synchronization of
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* the CPU cache for the given buffer assuming that it has been already
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* transferred to 'device' domain.
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*/
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#define DMA_ATTR_SKIP_CPU_SYNC (1UL << 5)
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/*
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* DMA_ATTR_FORCE_CONTIGUOUS: Forces contiguous allocation of the buffer
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* in physical memory.
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*/
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#define DMA_ATTR_FORCE_CONTIGUOUS (1UL << 6)
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/*
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* DMA_ATTR_ALLOC_SINGLE_PAGES: This is a hint to the DMA-mapping subsystem
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* that it's probably not worth the time to try to allocate memory to in a way
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* that gives better TLB efficiency.
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*/
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#define DMA_ATTR_ALLOC_SINGLE_PAGES (1UL << 7)
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/*
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* DMA_ATTR_NO_WARN: This tells the DMA-mapping subsystem to suppress
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* allocation failure reports (similarly to __GFP_NOWARN).
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*/
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#define DMA_ATTR_NO_WARN (1UL << 8)
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/*
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* DMA_ATTR_PRIVILEGED: used to indicate that the buffer is fully
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* accessible at an elevated privilege level (and ideally inaccessible or
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* at least read-only at lesser-privileged levels).
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*/
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#define DMA_ATTR_PRIVILEGED (1UL << 9)
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/*
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* A dma_addr_t can hold any valid DMA or bus address for the platform.
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* It can be given to a device to use as a DMA source or target. A CPU cannot
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* reference a dma_addr_t directly because there may be translation between
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* its physical address space and the bus address space.
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*/
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struct dma_map_ops {
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void* (*alloc)(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp,
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unsigned long attrs);
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void (*free)(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle,
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unsigned long attrs);
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int (*mmap)(struct device *, struct vm_area_struct *,
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void *, dma_addr_t, size_t,
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unsigned long attrs);
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int (*get_sgtable)(struct device *dev, struct sg_table *sgt, void *,
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dma_addr_t, size_t, unsigned long attrs);
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dma_addr_t (*map_page)(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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unsigned long attrs);
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void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction dir,
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unsigned long attrs);
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/*
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* map_sg returns 0 on error and a value > 0 on success.
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* It should never return a value < 0.
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*/
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int (*map_sg)(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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unsigned long attrs);
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void (*unmap_sg)(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir,
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unsigned long attrs);
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dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
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size_t size, enum dma_data_direction dir,
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unsigned long attrs);
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void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction dir,
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unsigned long attrs);
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void (*sync_single_for_cpu)(struct device *dev,
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dma_addr_t dma_handle, size_t size,
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enum dma_data_direction dir);
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void (*sync_single_for_device)(struct device *dev,
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dma_addr_t dma_handle, size_t size,
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enum dma_data_direction dir);
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void (*sync_sg_for_cpu)(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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void (*sync_sg_for_device)(struct device *dev,
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struct scatterlist *sg, int nents,
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enum dma_data_direction dir);
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int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
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int (*dma_supported)(struct device *dev, u64 mask);
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#ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
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u64 (*get_required_mask)(struct device *dev);
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#endif
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int is_phys;
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};
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extern const struct dma_map_ops dma_noop_ops;
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extern const struct dma_map_ops dma_virt_ops;
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#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
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#define DMA_MASK_NONE 0x0ULL
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static inline int valid_dma_direction(int dma_direction)
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{
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return ((dma_direction == DMA_BIDIRECTIONAL) ||
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(dma_direction == DMA_TO_DEVICE) ||
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(dma_direction == DMA_FROM_DEVICE));
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}
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static inline int is_device_dma_capable(struct device *dev)
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{
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return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
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}
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#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
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/*
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* These three functions are only for dma allocator.
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* Don't use them in device drivers.
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*/
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int dma_alloc_from_coherent(struct device *dev, ssize_t size,
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dma_addr_t *dma_handle, void **ret);
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int dma_release_from_coherent(struct device *dev, int order, void *vaddr);
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int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, size_t size, int *ret);
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#else
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#define dma_alloc_from_coherent(dev, size, handle, ret) (0)
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#define dma_release_from_coherent(dev, order, vaddr) (0)
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#define dma_mmap_from_coherent(dev, vma, vaddr, order, ret) (0)
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#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
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#ifdef CONFIG_HAS_DMA
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#include <asm/dma-mapping.h>
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static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
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{
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if (dev && dev->dma_ops)
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return dev->dma_ops;
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return get_arch_dma_ops(dev ? dev->bus : NULL);
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}
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static inline void set_dma_ops(struct device *dev,
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const struct dma_map_ops *dma_ops)
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{
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dev->dma_ops = dma_ops;
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}
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#else
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/*
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* Define the dma api to allow compilation but not linking of
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* dma dependent code. Code that depends on the dma-mapping
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* API needs to set 'depends on HAS_DMA' in its Kconfig
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*/
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extern const struct dma_map_ops bad_dma_ops;
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static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
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{
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return &bad_dma_ops;
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}
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#endif
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static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
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size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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dma_addr_t addr;
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kmemcheck_mark_initialized(ptr, size);
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BUG_ON(!valid_dma_direction(dir));
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addr = ops->map_page(dev, virt_to_page(ptr),
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offset_in_page(ptr), size,
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dir, attrs);
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debug_dma_map_page(dev, virt_to_page(ptr),
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offset_in_page(ptr), size,
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dir, addr, true);
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return addr;
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}
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static inline void dma_unmap_single_attrs(struct device *dev, dma_addr_t addr,
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size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (ops->unmap_page)
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ops->unmap_page(dev, addr, size, dir, attrs);
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debug_dma_unmap_page(dev, addr, size, dir, true);
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}
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/*
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* dma_maps_sg_attrs returns 0 on error and > 0 on success.
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* It should never return a value < 0.
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*/
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static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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int i, ents;
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struct scatterlist *s;
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for_each_sg(sg, s, nents, i)
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kmemcheck_mark_initialized(sg_virt(s), s->length);
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BUG_ON(!valid_dma_direction(dir));
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ents = ops->map_sg(dev, sg, nents, dir, attrs);
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BUG_ON(ents < 0);
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debug_dma_map_sg(dev, sg, nents, ents, dir);
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return ents;
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}
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static inline void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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debug_dma_unmap_sg(dev, sg, nents, dir);
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if (ops->unmap_sg)
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ops->unmap_sg(dev, sg, nents, dir, attrs);
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}
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static inline dma_addr_t dma_map_page_attrs(struct device *dev,
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struct page *page,
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size_t offset, size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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dma_addr_t addr;
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kmemcheck_mark_initialized(page_address(page) + offset, size);
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BUG_ON(!valid_dma_direction(dir));
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addr = ops->map_page(dev, page, offset, size, dir, attrs);
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debug_dma_map_page(dev, page, offset, size, dir, addr, false);
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return addr;
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}
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static inline void dma_unmap_page_attrs(struct device *dev,
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dma_addr_t addr, size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (ops->unmap_page)
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ops->unmap_page(dev, addr, size, dir, attrs);
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debug_dma_unmap_page(dev, addr, size, dir, false);
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}
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static inline dma_addr_t dma_map_resource(struct device *dev,
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phys_addr_t phys_addr,
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size_t size,
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enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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dma_addr_t addr;
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BUG_ON(!valid_dma_direction(dir));
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/* Don't allow RAM to be mapped */
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BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
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addr = phys_addr;
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if (ops->map_resource)
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addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
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debug_dma_map_resource(dev, phys_addr, size, dir, addr);
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return addr;
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}
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static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr,
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size_t size, enum dma_data_direction dir,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (ops->unmap_resource)
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ops->unmap_resource(dev, addr, size, dir, attrs);
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debug_dma_unmap_resource(dev, addr, size, dir);
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}
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static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
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size_t size,
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enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (ops->sync_single_for_cpu)
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ops->sync_single_for_cpu(dev, addr, size, dir);
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debug_dma_sync_single_for_cpu(dev, addr, size, dir);
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}
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static inline void dma_sync_single_for_device(struct device *dev,
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dma_addr_t addr, size_t size,
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enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (ops->sync_single_for_device)
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ops->sync_single_for_device(dev, addr, size, dir);
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debug_dma_sync_single_for_device(dev, addr, size, dir);
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}
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static inline void dma_sync_single_range_for_cpu(struct device *dev,
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dma_addr_t addr,
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unsigned long offset,
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size_t size,
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enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (ops->sync_single_for_cpu)
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ops->sync_single_for_cpu(dev, addr + offset, size, dir);
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debug_dma_sync_single_range_for_cpu(dev, addr, offset, size, dir);
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}
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static inline void dma_sync_single_range_for_device(struct device *dev,
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dma_addr_t addr,
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unsigned long offset,
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size_t size,
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enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (ops->sync_single_for_device)
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ops->sync_single_for_device(dev, addr + offset, size, dir);
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debug_dma_sync_single_range_for_device(dev, addr, offset, size, dir);
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}
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static inline void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
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int nelems, enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (ops->sync_sg_for_cpu)
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ops->sync_sg_for_cpu(dev, sg, nelems, dir);
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debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
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}
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static inline void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
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int nelems, enum dma_data_direction dir)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!valid_dma_direction(dir));
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if (ops->sync_sg_for_device)
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ops->sync_sg_for_device(dev, sg, nelems, dir);
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debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
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}
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#define dma_map_single(d, a, s, r) dma_map_single_attrs(d, a, s, r, 0)
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#define dma_unmap_single(d, a, s, r) dma_unmap_single_attrs(d, a, s, r, 0)
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#define dma_map_sg(d, s, n, r) dma_map_sg_attrs(d, s, n, r, 0)
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#define dma_unmap_sg(d, s, n, r) dma_unmap_sg_attrs(d, s, n, r, 0)
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#define dma_map_page(d, p, o, s, r) dma_map_page_attrs(d, p, o, s, r, 0)
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#define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0)
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extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
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void *cpu_addr, dma_addr_t dma_addr, size_t size);
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void *dma_common_contiguous_remap(struct page *page, size_t size,
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unsigned long vm_flags,
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pgprot_t prot, const void *caller);
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void *dma_common_pages_remap(struct page **pages, size_t size,
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unsigned long vm_flags, pgprot_t prot,
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const void *caller);
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void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags);
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/**
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* dma_mmap_attrs - map a coherent DMA allocation into user space
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* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
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* @vma: vm_area_struct describing requested user mapping
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* @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
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* @handle: device-view address returned from dma_alloc_attrs
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* @size: size of memory originally requested in dma_alloc_attrs
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* @attrs: attributes of mapping properties requested in dma_alloc_attrs
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*
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* Map a coherent DMA buffer previously allocated by dma_alloc_attrs
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* into user space. The coherent DMA buffer must not be freed by the
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* driver until the user space mapping has been released.
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*/
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static inline int
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dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
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dma_addr_t dma_addr, size_t size, unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!ops);
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if (ops->mmap)
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return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
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return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
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}
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#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)
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|
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int
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dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
|
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void *cpu_addr, dma_addr_t dma_addr, size_t size);
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static inline int
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dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt, void *cpu_addr,
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dma_addr_t dma_addr, size_t size,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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BUG_ON(!ops);
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if (ops->get_sgtable)
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return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size,
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attrs);
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return dma_common_get_sgtable(dev, sgt, cpu_addr, dma_addr, size);
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}
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#define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0)
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#ifndef arch_dma_alloc_attrs
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#define arch_dma_alloc_attrs(dev, flag) (true)
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#endif
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static inline void *dma_alloc_attrs(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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void *cpu_addr;
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BUG_ON(!ops);
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if (dma_alloc_from_coherent(dev, size, dma_handle, &cpu_addr))
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return cpu_addr;
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if (!arch_dma_alloc_attrs(&dev, &flag))
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return NULL;
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if (!ops->alloc)
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return NULL;
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cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
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debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
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return cpu_addr;
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}
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static inline void dma_free_attrs(struct device *dev, size_t size,
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void *cpu_addr, dma_addr_t dma_handle,
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unsigned long attrs)
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{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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|
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BUG_ON(!ops);
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WARN_ON(irqs_disabled());
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if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
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return;
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if (!ops->free || !cpu_addr)
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return;
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debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
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ops->free(dev, size, cpu_addr, dma_handle, attrs);
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}
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static inline void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flag)
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{
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return dma_alloc_attrs(dev, size, dma_handle, flag, 0);
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}
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static inline void dma_free_coherent(struct device *dev, size_t size,
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void *cpu_addr, dma_addr_t dma_handle)
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{
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return dma_free_attrs(dev, size, cpu_addr, dma_handle, 0);
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}
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static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp)
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{
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return dma_alloc_attrs(dev, size, dma_handle, gfp,
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DMA_ATTR_NON_CONSISTENT);
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}
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static inline void dma_free_noncoherent(struct device *dev, size_t size,
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void *cpu_addr, dma_addr_t dma_handle)
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{
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dma_free_attrs(dev, size, cpu_addr, dma_handle,
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DMA_ATTR_NON_CONSISTENT);
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}
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static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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{
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debug_dma_mapping_error(dev, dma_addr);
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|
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if (get_dma_ops(dev)->mapping_error)
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return get_dma_ops(dev)->mapping_error(dev, dma_addr);
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return 0;
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}
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|
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static inline int dma_supported(struct device *dev, u64 mask)
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|
{
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const struct dma_map_ops *ops = get_dma_ops(dev);
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|
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if (!ops)
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return 0;
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if (!ops->dma_supported)
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return 1;
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return ops->dma_supported(dev, mask);
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}
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|
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#ifndef HAVE_ARCH_DMA_SET_MASK
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static inline int dma_set_mask(struct device *dev, u64 mask)
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{
|
|
if (!dev->dma_mask || !dma_supported(dev, mask))
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return -EIO;
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*dev->dma_mask = mask;
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return 0;
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}
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#endif
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|
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static inline u64 dma_get_mask(struct device *dev)
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|
{
|
|
if (dev && dev->dma_mask && *dev->dma_mask)
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|
return *dev->dma_mask;
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|
return DMA_BIT_MASK(32);
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|
}
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|
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#ifdef CONFIG_ARCH_HAS_DMA_SET_COHERENT_MASK
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int dma_set_coherent_mask(struct device *dev, u64 mask);
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|
#else
|
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static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
|
|
{
|
|
if (!dma_supported(dev, mask))
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|
return -EIO;
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|
dev->coherent_dma_mask = mask;
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|
return 0;
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|
}
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|
#endif
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|
|
/*
|
|
* Set both the DMA mask and the coherent DMA mask to the same thing.
|
|
* Note that we don't check the return value from dma_set_coherent_mask()
|
|
* as the DMA API guarantees that the coherent DMA mask can be set to
|
|
* the same or smaller than the streaming DMA mask.
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|
*/
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|
static inline int dma_set_mask_and_coherent(struct device *dev, u64 mask)
|
|
{
|
|
int rc = dma_set_mask(dev, mask);
|
|
if (rc == 0)
|
|
dma_set_coherent_mask(dev, mask);
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|
return rc;
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|
}
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|
|
/*
|
|
* Similar to the above, except it deals with the case where the device
|
|
* does not have dev->dma_mask appropriately setup.
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|
*/
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static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
|
|
{
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|
dev->dma_mask = &dev->coherent_dma_mask;
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return dma_set_mask_and_coherent(dev, mask);
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|
}
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|
|
|
extern u64 dma_get_required_mask(struct device *dev);
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|
|
|
#ifndef arch_setup_dma_ops
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|
static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
|
|
u64 size, const struct iommu_ops *iommu,
|
|
bool coherent) { }
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|
#endif
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|
|
|
#ifndef arch_teardown_dma_ops
|
|
static inline void arch_teardown_dma_ops(struct device *dev) { }
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|
#endif
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|
|
static inline unsigned int dma_get_max_seg_size(struct device *dev)
|
|
{
|
|
if (dev->dma_parms && dev->dma_parms->max_segment_size)
|
|
return dev->dma_parms->max_segment_size;
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|
return SZ_64K;
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|
}
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|
|
|
static inline unsigned int dma_set_max_seg_size(struct device *dev,
|
|
unsigned int size)
|
|
{
|
|
if (dev->dma_parms) {
|
|
dev->dma_parms->max_segment_size = size;
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|
return 0;
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|
}
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|
return -EIO;
|
|
}
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|
|
|
static inline unsigned long dma_get_seg_boundary(struct device *dev)
|
|
{
|
|
if (dev->dma_parms && dev->dma_parms->segment_boundary_mask)
|
|
return dev->dma_parms->segment_boundary_mask;
|
|
return DMA_BIT_MASK(32);
|
|
}
|
|
|
|
static inline int dma_set_seg_boundary(struct device *dev, unsigned long mask)
|
|
{
|
|
if (dev->dma_parms) {
|
|
dev->dma_parms->segment_boundary_mask = mask;
|
|
return 0;
|
|
}
|
|
return -EIO;
|
|
}
|
|
|
|
#ifndef dma_max_pfn
|
|
static inline unsigned long dma_max_pfn(struct device *dev)
|
|
{
|
|
return *dev->dma_mask >> PAGE_SHIFT;
|
|
}
|
|
#endif
|
|
|
|
static inline void *dma_zalloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flag)
|
|
{
|
|
void *ret = dma_alloc_coherent(dev, size, dma_handle,
|
|
flag | __GFP_ZERO);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_HAS_DMA
|
|
static inline int dma_get_cache_alignment(void)
|
|
{
|
|
#ifdef ARCH_DMA_MINALIGN
|
|
return ARCH_DMA_MINALIGN;
|
|
#endif
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
/* flags for the coherent memory api */
|
|
#define DMA_MEMORY_MAP 0x01
|
|
#define DMA_MEMORY_IO 0x02
|
|
#define DMA_MEMORY_INCLUDES_CHILDREN 0x04
|
|
#define DMA_MEMORY_EXCLUSIVE 0x08
|
|
|
|
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
|
|
int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
|
|
dma_addr_t device_addr, size_t size, int flags);
|
|
void dma_release_declared_memory(struct device *dev);
|
|
void *dma_mark_declared_memory_occupied(struct device *dev,
|
|
dma_addr_t device_addr, size_t size);
|
|
#else
|
|
static inline int
|
|
dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
|
|
dma_addr_t device_addr, size_t size, int flags)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
dma_release_declared_memory(struct device *dev)
|
|
{
|
|
}
|
|
|
|
static inline void *
|
|
dma_mark_declared_memory_occupied(struct device *dev,
|
|
dma_addr_t device_addr, size_t size)
|
|
{
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
|
|
|
|
#ifdef CONFIG_HAS_DMA
|
|
int dma_configure(struct device *dev);
|
|
void dma_deconfigure(struct device *dev);
|
|
#else
|
|
static inline int dma_configure(struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void dma_deconfigure(struct device *dev) {}
|
|
#endif
|
|
|
|
/*
|
|
* Managed DMA API
|
|
*/
|
|
extern void *dmam_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t gfp);
|
|
extern void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
|
|
dma_addr_t dma_handle);
|
|
extern void *dmam_alloc_attrs(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t gfp,
|
|
unsigned long attrs);
|
|
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
|
|
extern int dmam_declare_coherent_memory(struct device *dev,
|
|
phys_addr_t phys_addr,
|
|
dma_addr_t device_addr, size_t size,
|
|
int flags);
|
|
extern void dmam_release_declared_memory(struct device *dev);
|
|
#else /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
|
|
static inline int dmam_declare_coherent_memory(struct device *dev,
|
|
phys_addr_t phys_addr, dma_addr_t device_addr,
|
|
size_t size, gfp_t gfp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void dmam_release_declared_memory(struct device *dev)
|
|
{
|
|
}
|
|
#endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
|
|
|
|
static inline void *dma_alloc_wc(struct device *dev, size_t size,
|
|
dma_addr_t *dma_addr, gfp_t gfp)
|
|
{
|
|
return dma_alloc_attrs(dev, size, dma_addr, gfp,
|
|
DMA_ATTR_WRITE_COMBINE);
|
|
}
|
|
#ifndef dma_alloc_writecombine
|
|
#define dma_alloc_writecombine dma_alloc_wc
|
|
#endif
|
|
|
|
static inline void dma_free_wc(struct device *dev, size_t size,
|
|
void *cpu_addr, dma_addr_t dma_addr)
|
|
{
|
|
return dma_free_attrs(dev, size, cpu_addr, dma_addr,
|
|
DMA_ATTR_WRITE_COMBINE);
|
|
}
|
|
#ifndef dma_free_writecombine
|
|
#define dma_free_writecombine dma_free_wc
|
|
#endif
|
|
|
|
static inline int dma_mmap_wc(struct device *dev,
|
|
struct vm_area_struct *vma,
|
|
void *cpu_addr, dma_addr_t dma_addr,
|
|
size_t size)
|
|
{
|
|
return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size,
|
|
DMA_ATTR_WRITE_COMBINE);
|
|
}
|
|
#ifndef dma_mmap_writecombine
|
|
#define dma_mmap_writecombine dma_mmap_wc
|
|
#endif
|
|
|
|
#if defined(CONFIG_NEED_DMA_MAP_STATE) || defined(CONFIG_DMA_API_DEBUG)
|
|
#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME) dma_addr_t ADDR_NAME
|
|
#define DEFINE_DMA_UNMAP_LEN(LEN_NAME) __u32 LEN_NAME
|
|
#define dma_unmap_addr(PTR, ADDR_NAME) ((PTR)->ADDR_NAME)
|
|
#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) (((PTR)->ADDR_NAME) = (VAL))
|
|
#define dma_unmap_len(PTR, LEN_NAME) ((PTR)->LEN_NAME)
|
|
#define dma_unmap_len_set(PTR, LEN_NAME, VAL) (((PTR)->LEN_NAME) = (VAL))
|
|
#else
|
|
#define DEFINE_DMA_UNMAP_ADDR(ADDR_NAME)
|
|
#define DEFINE_DMA_UNMAP_LEN(LEN_NAME)
|
|
#define dma_unmap_addr(PTR, ADDR_NAME) (0)
|
|
#define dma_unmap_addr_set(PTR, ADDR_NAME, VAL) do { } while (0)
|
|
#define dma_unmap_len(PTR, LEN_NAME) (0)
|
|
#define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
|
|
#endif
|
|
|
|
#endif
|