mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-07 07:16:40 +07:00
154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
|
/*
|
||
|
* Copyright (C) 2011 Texas Instruments Incorporated
|
||
|
* Author: Mark Salter <msalter@redhat.com>
|
||
|
*
|
||
|
* This program is free software; you can redistribute it and/or modify
|
||
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
* published by the Free Software Foundation.
|
||
|
*/
|
||
|
#include <linux/module.h>
|
||
|
#include <linux/dma-mapping.h>
|
||
|
#include <linux/mm.h>
|
||
|
#include <linux/mm_types.h>
|
||
|
#include <linux/scatterlist.h>
|
||
|
|
||
|
#include <asm/cacheflush.h>
|
||
|
|
||
|
static void c6x_dma_sync(dma_addr_t handle, size_t size,
|
||
|
enum dma_data_direction dir)
|
||
|
{
|
||
|
unsigned long paddr = handle;
|
||
|
|
||
|
BUG_ON(!valid_dma_direction(dir));
|
||
|
|
||
|
switch (dir) {
|
||
|
case DMA_FROM_DEVICE:
|
||
|
L2_cache_block_invalidate(paddr, paddr + size);
|
||
|
break;
|
||
|
case DMA_TO_DEVICE:
|
||
|
L2_cache_block_writeback(paddr, paddr + size);
|
||
|
break;
|
||
|
case DMA_BIDIRECTIONAL:
|
||
|
L2_cache_block_writeback_invalidate(paddr, paddr + size);
|
||
|
break;
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
|
||
|
enum dma_data_direction dir)
|
||
|
{
|
||
|
dma_addr_t addr = virt_to_phys(ptr);
|
||
|
|
||
|
c6x_dma_sync(addr, size, dir);
|
||
|
|
||
|
debug_dma_map_page(dev, virt_to_page(ptr),
|
||
|
(unsigned long)ptr & ~PAGE_MASK, size,
|
||
|
dir, addr, true);
|
||
|
return addr;
|
||
|
}
|
||
|
EXPORT_SYMBOL(dma_map_single);
|
||
|
|
||
|
|
||
|
void dma_unmap_single(struct device *dev, dma_addr_t handle,
|
||
|
size_t size, enum dma_data_direction dir)
|
||
|
{
|
||
|
c6x_dma_sync(handle, size, dir);
|
||
|
|
||
|
debug_dma_unmap_page(dev, handle, size, dir, true);
|
||
|
}
|
||
|
EXPORT_SYMBOL(dma_unmap_single);
|
||
|
|
||
|
|
||
|
int dma_map_sg(struct device *dev, struct scatterlist *sglist,
|
||
|
int nents, enum dma_data_direction dir)
|
||
|
{
|
||
|
struct scatterlist *sg;
|
||
|
int i;
|
||
|
|
||
|
for_each_sg(sglist, sg, nents, i)
|
||
|
sg->dma_address = dma_map_single(dev, sg_virt(sg), sg->length,
|
||
|
dir);
|
||
|
|
||
|
debug_dma_map_sg(dev, sglist, nents, nents, dir);
|
||
|
|
||
|
return nents;
|
||
|
}
|
||
|
EXPORT_SYMBOL(dma_map_sg);
|
||
|
|
||
|
|
||
|
void dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
|
||
|
int nents, enum dma_data_direction dir)
|
||
|
{
|
||
|
struct scatterlist *sg;
|
||
|
int i;
|
||
|
|
||
|
for_each_sg(sglist, sg, nents, i)
|
||
|
dma_unmap_single(dev, sg_dma_address(sg), sg->length, dir);
|
||
|
|
||
|
debug_dma_unmap_sg(dev, sglist, nents, dir);
|
||
|
}
|
||
|
EXPORT_SYMBOL(dma_unmap_sg);
|
||
|
|
||
|
void dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle,
|
||
|
size_t size, enum dma_data_direction dir)
|
||
|
{
|
||
|
c6x_dma_sync(handle, size, dir);
|
||
|
|
||
|
debug_dma_sync_single_for_cpu(dev, handle, size, dir);
|
||
|
}
|
||
|
EXPORT_SYMBOL(dma_sync_single_for_cpu);
|
||
|
|
||
|
|
||
|
void dma_sync_single_for_device(struct device *dev, dma_addr_t handle,
|
||
|
size_t size, enum dma_data_direction dir)
|
||
|
{
|
||
|
c6x_dma_sync(handle, size, dir);
|
||
|
|
||
|
debug_dma_sync_single_for_device(dev, handle, size, dir);
|
||
|
}
|
||
|
EXPORT_SYMBOL(dma_sync_single_for_device);
|
||
|
|
||
|
|
||
|
void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist,
|
||
|
int nents, enum dma_data_direction dir)
|
||
|
{
|
||
|
struct scatterlist *sg;
|
||
|
int i;
|
||
|
|
||
|
for_each_sg(sglist, sg, nents, i)
|
||
|
dma_sync_single_for_cpu(dev, sg_dma_address(sg),
|
||
|
sg->length, dir);
|
||
|
|
||
|
debug_dma_sync_sg_for_cpu(dev, sglist, nents, dir);
|
||
|
}
|
||
|
EXPORT_SYMBOL(dma_sync_sg_for_cpu);
|
||
|
|
||
|
|
||
|
void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist,
|
||
|
int nents, enum dma_data_direction dir)
|
||
|
{
|
||
|
struct scatterlist *sg;
|
||
|
int i;
|
||
|
|
||
|
for_each_sg(sglist, sg, nents, i)
|
||
|
dma_sync_single_for_device(dev, sg_dma_address(sg),
|
||
|
sg->length, dir);
|
||
|
|
||
|
debug_dma_sync_sg_for_device(dev, sglist, nents, dir);
|
||
|
}
|
||
|
EXPORT_SYMBOL(dma_sync_sg_for_device);
|
||
|
|
||
|
|
||
|
/* Number of entries preallocated for DMA-API debugging */
|
||
|
#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
|
||
|
|
||
|
static int __init dma_init(void)
|
||
|
{
|
||
|
dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
fs_initcall(dma_init);
|