59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*
|
|
* Copyright (c) 2015, Xilinx Inc. and Contributors. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <metal/errno.h>
|
|
#include <string.h>
|
|
#include <metal/device.h>
|
|
#include <metal/log.h>
|
|
#include <metal/dma.h>
|
|
#include <metal/atomic.h>
|
|
|
|
int metal_dma_map(struct metal_device *dev,
|
|
uint32_t dir,
|
|
struct metal_sg *sg_in,
|
|
int nents_in,
|
|
struct metal_sg *sg_out)
|
|
{
|
|
int nents_out;
|
|
|
|
if (!dev || !sg_in || !sg_out)
|
|
return -EINVAL;
|
|
if (!dev->bus->ops.dev_dma_map)
|
|
return -ENODEV;
|
|
|
|
/* memory barrier */
|
|
if (dir == METAL_DMA_DEV_R)
|
|
/* If it is device read, apply memory write fence. */
|
|
atomic_thread_fence(memory_order_release);
|
|
else
|
|
/* If it is device write or device r/w,
|
|
apply memory r/w fence. */
|
|
atomic_thread_fence(memory_order_acq_rel);
|
|
nents_out = dev->bus->ops.dev_dma_map(dev->bus,
|
|
dev, dir, sg_in, nents_in, sg_out);
|
|
return nents_out;
|
|
}
|
|
|
|
void metal_dma_unmap(struct metal_device *dev,
|
|
uint32_t dir,
|
|
struct metal_sg *sg,
|
|
int nents)
|
|
{
|
|
/* memory barrier */
|
|
if (dir == METAL_DMA_DEV_R)
|
|
/* If it is device read, apply memory write fence. */
|
|
atomic_thread_fence(memory_order_release);
|
|
else
|
|
/* If it is device write or device r/w,
|
|
apply memory r/w fence. */
|
|
atomic_thread_fence(memory_order_acq_rel);
|
|
|
|
if (!dev || !dev->bus->ops.dev_dma_unmap || !sg)
|
|
return;
|
|
dev->bus->ops.dev_dma_unmap(dev->bus,
|
|
dev, dir, sg, nents);
|
|
}
|