diff options
Diffstat (limited to 'drivers/ieee1394/dma.c')
| -rw-r--r-- | drivers/ieee1394/dma.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/ieee1394/dma.c b/drivers/ieee1394/dma.c index c68f328e1a29..45d605581922 100644 --- a/drivers/ieee1394/dma.c +++ b/drivers/ieee1394/dma.c @@ -62,6 +62,9 @@ void dma_prog_region_free(struct dma_prog_region *prog) /* dma_region */ +/** + * dma_region_init - clear out all fields but do not allocate anything + */ void dma_region_init(struct dma_region *dma) { dma->kvirt = NULL; @@ -71,6 +74,9 @@ void dma_region_init(struct dma_region *dma) dma->sglist = NULL; } +/** + * dma_region_alloc - 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) { @@ -128,6 +134,9 @@ int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, return -ENOMEM; } +/** + * dma_region_free - unmap and free the buffer + */ void dma_region_free(struct dma_region *dma) { if (dma->n_dma_pages) { @@ -167,6 +176,12 @@ static inline int dma_region_find(struct dma_region *dma, unsigned long offset, return i; } +/** + * dma_region_offset_to_bus - get bus address of an offset within a DMA region + * + * Returns the DMA bus address of the byte with the given @offset relative to + * the beginning of the @dma. + */ dma_addr_t dma_region_offset_to_bus(struct dma_region * dma, unsigned long offset) { @@ -177,6 +192,9 @@ dma_addr_t dma_region_offset_to_bus(struct dma_region * dma, return sg_dma_address(sg) + rem; } +/** + * dma_region_sync_for_cpu - sync the CPU's view of the buffer + */ void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, unsigned long len) { @@ -193,6 +211,9 @@ void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, dma->direction); } +/** + * dma_region_sync_for_device - sync the IO bus' view of the buffer + */ void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset, unsigned long len) { @@ -244,6 +265,9 @@ static struct vm_operations_struct dma_region_vm_ops = { .nopage = dma_region_pagefault, }; +/** + * dma_region_mmap - map the buffer into a user space process + */ int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma) { |