mirror of
https://github.com/torvalds/linux.git
synced 2024-11-16 00:52:01 +00:00
de4394f13c
Remove unnecessary includes, add missing includes. Use forward type declarations for some structs. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Ben Collins <bcollins@ubuntu.com>
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/*
|
|
* DMA region bookkeeping routines
|
|
*
|
|
* Copyright (C) 2002 Maas Digital LLC
|
|
*
|
|
* This code is licensed under the GPL. See the file COPYING in the root
|
|
* directory of the kernel sources for details.
|
|
*/
|
|
|
|
#ifndef IEEE1394_DMA_H
|
|
#define IEEE1394_DMA_H
|
|
|
|
#include <asm/types.h>
|
|
|
|
struct pci_dev;
|
|
struct scatterlist;
|
|
struct vm_area_struct;
|
|
|
|
/**
|
|
* struct dma_prog_region - small contiguous DMA buffer
|
|
* @kvirt: kernel virtual address
|
|
* @dev: PCI device
|
|
* @n_pages: number of kernel pages
|
|
* @bus_addr: base bus address
|
|
*
|
|
* a small, physically contiguous DMA buffer with random-access, synchronous
|
|
* usage characteristics
|
|
*/
|
|
struct dma_prog_region {
|
|
unsigned char *kvirt;
|
|
struct pci_dev *dev;
|
|
unsigned int n_pages;
|
|
dma_addr_t bus_addr;
|
|
};
|
|
|
|
/* clear out all fields but do not allocate any memory */
|
|
void dma_prog_region_init(struct dma_prog_region *prog);
|
|
int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
|
|
struct pci_dev *dev);
|
|
void dma_prog_region_free(struct dma_prog_region *prog);
|
|
|
|
static inline dma_addr_t dma_prog_region_offset_to_bus(
|
|
struct dma_prog_region *prog, unsigned long offset)
|
|
{
|
|
return prog->bus_addr + offset;
|
|
}
|
|
|
|
/**
|
|
* struct dma_region - large non-contiguous DMA buffer
|
|
* @virt: kernel virtual address
|
|
* @dev: PCI device
|
|
* @n_pages: number of kernel pages
|
|
* @n_dma_pages: number of IOMMU pages
|
|
* @sglist: IOMMU mapping
|
|
* @direction: PCI_DMA_TODEVICE, etc.
|
|
*
|
|
* a large, non-physically-contiguous DMA buffer with streaming, asynchronous
|
|
* usage characteristics
|
|
*/
|
|
struct dma_region {
|
|
unsigned char *kvirt;
|
|
struct pci_dev *dev;
|
|
unsigned int n_pages;
|
|
unsigned int n_dma_pages;
|
|
struct scatterlist *sglist;
|
|
int direction;
|
|
};
|
|
|
|
/* clear out all fields but do not allocate anything */
|
|
void dma_region_init(struct dma_region *dma);
|
|
|
|
/* allocate the buffer and map it to the IOMMU */
|
|
int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
|
|
struct pci_dev *dev, int direction);
|
|
|
|
/* unmap and free the buffer */
|
|
void dma_region_free(struct dma_region *dma);
|
|
|
|
/* sync the CPU's view of the buffer */
|
|
void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
|
|
unsigned long len);
|
|
|
|
/* sync the IO bus' view of the buffer */
|
|
void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
|
|
unsigned long len);
|
|
|
|
/* map the buffer into a user space process */
|
|
int dma_region_mmap(struct dma_region *dma, struct file *file,
|
|
struct vm_area_struct *vma);
|
|
|
|
/* macro to index into a DMA region (or dma_prog_region) */
|
|
#define dma_region_i(_dma, _type, _index) \
|
|
( ((_type*) ((_dma)->kvirt)) + (_index) )
|
|
|
|
/* return the DMA bus address of the byte with the given offset
|
|
* relative to the beginning of the dma_region */
|
|
dma_addr_t dma_region_offset_to_bus(struct dma_region *dma,
|
|
unsigned long offset);
|
|
|
|
#endif /* IEEE1394_DMA_H */
|