diff options
Diffstat (limited to 'drivers/ieee1394/dma.c')
| -rw-r--r-- | drivers/ieee1394/dma.c | 289 |
1 files changed, 0 insertions, 289 deletions
diff --git a/drivers/ieee1394/dma.c b/drivers/ieee1394/dma.c deleted file mode 100644 index d178699b194a..000000000000 --- a/drivers/ieee1394/dma.c +++ /dev/null @@ -1,289 +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/mm.h> -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/vmalloc.h> -#include <linux/scatterlist.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 */ - -/** - * dma_region_init - clear out all fields but do not allocate anything - */ -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; -} - -/** - * 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) -{ - 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; - } - - sg_init_table(dma->sglist, dma->n_pages); - - /* fill scatter/gather list with pages */ - for (i = 0; i < dma->n_pages; i++) { - unsigned long va = - (unsigned long)dma->kvirt + (i << PAGE_SHIFT); - - sg_set_page(&dma->sglist[i], vmalloc_to_page((void *)va), - PAGE_SIZE, 0); - } - - /* 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; -} - -/** - * dma_region_free - unmap and free the buffer - */ -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 int start, unsigned long *rem) -{ - int i; - unsigned long off = offset; - - for (i = start; 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_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) -{ - unsigned long rem = 0; - - struct scatterlist *sg = - &dma->sglist[dma_region_find(dma, offset, 0, &rem)]; - 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) -{ - int first, last; - unsigned long rem = 0; - - if (!len) - len = 1; - - first = dma_region_find(dma, offset, 0, &rem); - last = dma_region_find(dma, rem + len - 1, first, &rem); - - pci_dma_sync_sg_for_cpu(dma->dev, &dma->sglist[first], last - first + 1, - 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) -{ - int first, last; - unsigned long rem = 0; - - if (!len) - len = 1; - - first = dma_region_find(dma, offset, 0, &rem); - last = dma_region_find(dma, rem + len - 1, first, &rem); - - pci_dma_sync_sg_for_device(dma->dev, &dma->sglist[first], - last - first + 1, dma->direction); -} - -#ifdef CONFIG_MMU - -static int dma_region_pagefault(struct vm_area_struct *vma, - struct vm_fault *vmf) -{ - struct dma_region *dma = (struct dma_region *)vma->vm_private_data; - - if (!dma->kvirt) - return VM_FAULT_SIGBUS; - - if (vmf->pgoff >= dma->n_pages) - return VM_FAULT_SIGBUS; - - vmf->page = vmalloc_to_page(dma->kvirt + (vmf->pgoff << PAGE_SHIFT)); - get_page(vmf->page); - return 0; -} - -static const struct vm_operations_struct dma_region_vm_ops = { - .fault = 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) -{ - unsigned long size; - - if (!dma->kvirt) - return -EINVAL; - - /* must be page-aligned (XXX: comment is wrong, we could allow pgoff) */ - 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 | VM_ALWAYSDUMP; - - 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 */ |