https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: c7788792a5e7b0d5d7f96d0766b4cb6112d47d75 authored by Linus Torvalds on 20 May 2013, 21:37:38 UTC
Linux 3.10-rc2
Linux 3.10-rc2
Tip revision: c778879
pci-dma.c
/* pci-dma.c: Dynamic DMA mapping support for the FRV CPUs that have MMUs
*
* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <linux/export.h>
#include <linux/highmem.h>
#include <linux/scatterlist.h>
#include <asm/io.h>
void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, gfp_t gfp)
{
void *ret;
ret = consistent_alloc(gfp, size, dma_handle);
if (ret)
memset(ret, 0, size);
return ret;
}
EXPORT_SYMBOL(dma_alloc_coherent);
void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
{
consistent_free(vaddr);
}
EXPORT_SYMBOL(dma_free_coherent);
dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
return virt_to_bus(ptr);
}
EXPORT_SYMBOL(dma_map_single);
int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction)
{
unsigned long dampr2;
void *vaddr;
int i;
BUG_ON(direction == DMA_NONE);
dampr2 = __get_DAMPR(2);
for (i = 0; i < nents; i++) {
vaddr = kmap_atomic_primary(sg_page(&sg[i]));
frv_dcache_writeback((unsigned long) vaddr,
(unsigned long) vaddr + PAGE_SIZE);
}
kunmap_atomic_primary(vaddr);
if (dampr2) {
__set_DAMPR(2, dampr2);
__set_IAMPR(2, dampr2);
}
return nents;
}
EXPORT_SYMBOL(dma_map_sg);
dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset,
size_t size, enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
flush_dcache_page(page);
return (dma_addr_t) page_to_phys(page) + offset;
}
EXPORT_SYMBOL(dma_map_page);