mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 22:10:49 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
106 lines
2.9 KiB
C
106 lines
2.9 KiB
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/slab.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/list.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/highmem.h>
|
|
#include <asm/io.h>
|
|
|
|
void *dma_alloc_coherent(struct device *hwdev, size_t size, dma_addr_t *dma_handle, int gfp)
|
|
{
|
|
void *ret;
|
|
|
|
ret = consistent_alloc(gfp, size, dma_handle);
|
|
if (ret)
|
|
memset(ret, 0, size);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void dma_free_coherent(struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
|
|
{
|
|
consistent_free(vaddr);
|
|
}
|
|
|
|
/*
|
|
* Map a single buffer of the indicated size for DMA in streaming mode.
|
|
* The 32-bit bus address to use is returned.
|
|
*
|
|
* Once the device is given the dma address, the device owns this memory
|
|
* until either pci_unmap_single or pci_dma_sync_single is performed.
|
|
*/
|
|
dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
|
|
enum dma_data_direction direction)
|
|
{
|
|
if (direction == DMA_NONE)
|
|
BUG();
|
|
|
|
frv_cache_wback_inv((unsigned long) ptr, (unsigned long) ptr + size);
|
|
|
|
return virt_to_bus(ptr);
|
|
}
|
|
|
|
/*
|
|
* Map a set of buffers described by scatterlist in streaming
|
|
* mode for DMA. This is the scather-gather version of the
|
|
* above pci_map_single interface. Here the scatter gather list
|
|
* elements are each tagged with the appropriate dma address
|
|
* and length. They are obtained via sg_dma_{address,length}(SG).
|
|
*
|
|
* NOTE: An implementation may be able to use a smaller number of
|
|
* DMA address/length pairs than there are SG table elements.
|
|
* (for example via virtual mapping capabilities)
|
|
* The routine returns the number of addr/length pairs actually
|
|
* used, at most nents.
|
|
*
|
|
* Device ownership issues as mentioned above for pci_map_single are
|
|
* the same here.
|
|
*/
|
|
int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
|
|
enum dma_data_direction direction)
|
|
{
|
|
unsigned long dampr2;
|
|
void *vaddr;
|
|
int i;
|
|
|
|
if (direction == DMA_NONE)
|
|
BUG();
|
|
|
|
dampr2 = __get_DAMPR(2);
|
|
|
|
for (i = 0; i < nents; i++) {
|
|
vaddr = kmap_atomic(sg[i].page, __KM_CACHE);
|
|
|
|
frv_dcache_writeback((unsigned long) vaddr,
|
|
(unsigned long) vaddr + PAGE_SIZE);
|
|
|
|
}
|
|
|
|
kunmap_atomic(vaddr, __KM_CACHE);
|
|
if (dampr2) {
|
|
__set_DAMPR(2, dampr2);
|
|
__set_IAMPR(2, dampr2);
|
|
}
|
|
|
|
return nents;
|
|
}
|
|
|
|
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;
|
|
}
|