mirror of
https://github.com/smaeul/u-boot.git
synced 2025-11-03 21:48:15 +00:00
a0594cefb7
Implement a DMA uclass so that the devices like ethernet, spi, mmc etc can offload the data transfers from/to the device and memory. Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Jagan Teki <jteki@openedev.com>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/*
|
|
* Direct Memory Access U-Class driver
|
|
*
|
|
* (C) Copyright 2015
|
|
* Texas Instruments Incorporated, <www.ti.com>
|
|
*
|
|
* Author: Mugunthan V N <mugunthanvnm@ti.com>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dma.h>
|
|
#include <dm.h>
|
|
#include <dm/uclass-internal.h>
|
|
#include <dm/device-internal.h>
|
|
#include <errno.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
int dma_get_device(u32 transfer_type, struct udevice **devp)
|
|
{
|
|
struct udevice *dev;
|
|
int ret;
|
|
|
|
for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret;
|
|
ret = uclass_next_device(&dev)) {
|
|
struct dma_dev_priv *uc_priv;
|
|
|
|
uc_priv = dev_get_uclass_priv(dev);
|
|
if (uc_priv->supported & transfer_type)
|
|
break;
|
|
}
|
|
|
|
if (!dev) {
|
|
error("No DMA device found that supports %x type\n",
|
|
transfer_type);
|
|
return -EPROTONOSUPPORT;
|
|
}
|
|
|
|
*devp = dev;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int dma_memcpy(void *dst, void *src, size_t len)
|
|
{
|
|
struct udevice *dev;
|
|
const struct dma_ops *ops;
|
|
int ret;
|
|
|
|
ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ops = device_get_ops(dev);
|
|
if (!ops->transfer)
|
|
return -ENOSYS;
|
|
|
|
/* Invalidate the area, so no writeback into the RAM races with DMA */
|
|
invalidate_dcache_range((unsigned long)dst, (unsigned long)dst +
|
|
roundup(len, ARCH_DMA_MINALIGN));
|
|
|
|
return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len);
|
|
}
|
|
|
|
UCLASS_DRIVER(dma) = {
|
|
.id = UCLASS_DMA,
|
|
.name = "dma",
|
|
.flags = DM_UC_FLAG_SEQ_ALIAS,
|
|
.per_device_auto_alloc_size = sizeof(struct dma_dev_priv),
|
|
};
|