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path: root/drivers/ieee1394/dma.c
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Diffstat (limited to 'drivers/ieee1394/dma.c')
-rw-r--r--drivers/ieee1394/dma.c260
1 files changed, 0 insertions, 260 deletions
diff --git a/drivers/ieee1394/dma.c b/drivers/ieee1394/dma.c
deleted file mode 100644
index b79ddb43e74..00000000000
--- a/drivers/ieee1394/dma.c
+++ /dev/null
@@ -1,260 +0,0 @@
-/*
- * 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.
- */
-
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/slab.h>
-#include <linux/mm.h>
-#include "dma.h"
-
-/* dma_prog_region */
-
-void dma_prog_region_init(struct dma_prog_region *prog)
-{
- prog->kvirt = NULL;
- prog->dev = NULL;
- prog->n_pages = 0;
- prog->bus_addr = 0;
-}
-
-int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes, struct pci_dev *dev)
-{
- /* round up to page size */
- n_bytes = PAGE_ALIGN(n_bytes);
-
- prog->n_pages = n_bytes >> PAGE_SHIFT;
-
- prog->kvirt = pci_alloc_consistent(dev, n_bytes, &prog->bus_addr);
- if (!prog->kvirt) {
- printk(KERN_ERR "dma_prog_region_alloc: pci_alloc_consistent() failed\n");
- dma_prog_region_free(prog);
- return -ENOMEM;
- }
-
- prog->dev = dev;
-
- return 0;
-}
-
-void dma_prog_region_free(struct dma_prog_region *prog)
-{
- if (prog->kvirt) {
- pci_free_consistent(prog->dev, prog->n_pages << PAGE_SHIFT, prog->kvirt, prog->bus_addr);
- }
-
- prog->kvirt = NULL;
- prog->dev = NULL;
- prog->n_pages = 0;
- prog->bus_addr = 0;
-}
-
-/* dma_region */
-
-void dma_region_init(struct dma_region *dma)
-{
- dma->kvirt = NULL;
- dma->dev = NULL;
- dma->n_pages = 0;
- dma->n_dma_pages = 0;
- dma->sglist = NULL;
-}
-
-int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, struct pci_dev *dev, int direction)
-{
- unsigned int i;
-
- /* round up to page size */
- n_bytes = PAGE_ALIGN(n_bytes);
-
- dma->n_pages = n_bytes >> PAGE_SHIFT;
-
- dma->kvirt = vmalloc_32(n_bytes);
- if (!dma->kvirt) {
- printk(KERN_ERR "dma_region_alloc: vmalloc_32() failed\n");
- goto err;
- }
-
- /* Clear the ram out, no junk to the user */
- memset(dma->kvirt, 0, n_bytes);
-
- /* allocate scatter/gather list */
- dma->sglist = vmalloc(dma->n_pages * sizeof(*dma->sglist));
- if (!dma->sglist) {
- printk(KERN_ERR "dma_region_alloc: vmalloc(sglist) failed\n");
- goto err;
- }
-
- /* just to be safe - this will become unnecessary once sglist->address goes away */
- memset(dma->sglist, 0, dma->n_pages * sizeof(*dma->sglist));
-
- /* fill scatter/gather list with pages */
- for (i = 0; i < dma->n_pages; i++) {
- unsigned long va = (unsigned long) dma->kvirt + (i << PAGE_SHIFT);
-
- dma->sglist[i].page = vmalloc_to_page((void *)va);
- dma->sglist[i].length = PAGE_SIZE;
- }
-
- /* map sglist to the IOMMU */
- dma->n_dma_pages = pci_map_sg(dev, dma->sglist, dma->n_pages, direction);
-
- if (dma->n_dma_pages == 0) {
- printk(KERN_ERR "dma_region_alloc: pci_map_sg() failed\n");
- goto err;
- }
-
- dma->dev = dev;
- dma->direction = direction;
-
- return 0;
-
-err:
- dma_region_free(dma);
- return -ENOMEM;
-}
-
-void dma_region_free(struct dma_region *dma)
-{
- if (dma->n_dma_pages) {
- pci_unmap_sg(dma->dev, dma->sglist, dma->n_pages, dma->direction);
- dma->n_dma_pages = 0;
- dma->dev = NULL;
- }
-
- vfree(dma->sglist);
- dma->sglist = NULL;
-
- vfree(dma->kvirt);
- dma->kvirt = NULL;
- dma->n_pages = 0;
-}
-
-/* find the scatterlist index and remaining offset corresponding to a
- given offset from the beginning of the buffer */
-static inline int dma_region_find(struct dma_region *dma, unsigned long offset, unsigned long *rem)
-{
- int i;
- unsigned long off = offset;
-
- for (i = 0; i < dma->n_dma_pages; i++) {
- if (off < sg_dma_len(&dma->sglist[i])) {
- *rem = off;
- break;
- }
-
- off -= sg_dma_len(&dma->sglist[i]);
- }
-
- BUG_ON(i >= dma->n_dma_pages);
-
- return i;
-}
-
-dma_addr_t dma_region_offset_to_bus(struct dma_region *dma, unsigned long offset)
-{
- unsigned long rem = 0;
-
- struct scatterlist *sg = &dma->sglist[dma_region_find(dma, offset, &rem)];
- return sg_dma_address(sg) + rem;
-}
-
-void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, unsigned long len)
-{
- int first, last;
- unsigned long rem;
-
- if (!len)
- len = 1;
-
- first = dma_region_find(dma, offset, &rem);
- last = dma_region_find(dma, offset + len - 1, &rem);
-
- pci_dma_sync_sg_for_cpu(dma->dev, &dma->sglist[first], last - first + 1, dma->direction);
-}
-
-void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset, unsigned long len)
-{
- int first, last;
- unsigned long rem;
-
- if (!len)
- len = 1;
-
- first = dma_region_find(dma, offset, &rem);
- last = dma_region_find(dma, offset + len - 1, &rem);
-
- pci_dma_sync_sg_for_device(dma->dev, &dma->sglist[first], last - first + 1, dma->direction);
-}
-
-#ifdef CONFIG_MMU
-
-/* nopage() handler for mmap access */
-
-static struct page*
-dma_region_pagefault(struct vm_area_struct *area, unsigned long address, int *type)
-{
- unsigned long offset;
- unsigned long kernel_virt_addr;
- struct page *ret = NOPAGE_SIGBUS;
-
- struct dma_region *dma = (struct dma_region*) area->vm_private_data;
-
- if (!dma->kvirt)
- goto out;
-
- if ( (address < (unsigned long) area->vm_start) ||
- (address > (unsigned long) area->vm_start + (dma->n_pages << PAGE_SHIFT)) )
- goto out;
-
- if (type)
- *type = VM_FAULT_MINOR;
- offset = address - area->vm_start;
- kernel_virt_addr = (unsigned long) dma->kvirt + offset;
- ret = vmalloc_to_page((void*) kernel_virt_addr);
- get_page(ret);
-out:
- return ret;
-}
-
-static struct vm_operations_struct dma_region_vm_ops = {
- .nopage = dma_region_pagefault,
-};
-
-int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma)
-{
- unsigned long size;
-
- if (!dma->kvirt)
- return -EINVAL;
-
- /* must be page-aligned */
- if (vma->vm_pgoff != 0)
- return -EINVAL;
-
- /* check the length */
- size = vma->vm_end - vma->vm_start;
- if (size > (dma->n_pages << PAGE_SHIFT))
- return -EINVAL;
-
- vma->vm_ops = &dma_region_vm_ops;
- vma->vm_private_data = dma;
- vma->vm_file = file;
- vma->vm_flags |= VM_RESERVED;
-
- return 0;
-}
-
-#else /* CONFIG_MMU */
-
-int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma)
-{
- return -EINVAL;
-}
-
-#endif /* CONFIG_MMU */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 23:03:31 +0000