1 // SPDX-License-Identifier: GPL-2.0+
3 * Direct Memory Access U-Class driver
6 * Texas Instruments Incorporated, <www.ti.com>
8 * Author: Mugunthan V N <mugunthanvnm@ti.com>
14 #include <dm/uclass-internal.h>
15 #include <dm/device-internal.h>
18 int dma_get_device(u32 transfer_type, struct udevice **devp)
23 for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret;
24 ret = uclass_next_device(&dev)) {
25 struct dma_dev_priv *uc_priv;
27 uc_priv = dev_get_uclass_priv(dev);
28 if (uc_priv->supported & transfer_type)
33 pr_err("No DMA device found that supports %x type\n",
35 return -EPROTONOSUPPORT;
43 int dma_memcpy(void *dst, void *src, size_t len)
46 const struct dma_ops *ops;
49 ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev);
53 ops = device_get_ops(dev);
57 /* Invalidate the area, so no writeback into the RAM races with DMA */
58 invalidate_dcache_range((unsigned long)dst, (unsigned long)dst +
59 roundup(len, ARCH_DMA_MINALIGN));
61 return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len);
64 UCLASS_DRIVER(dma) = {
67 .flags = DM_UC_FLAG_SEQ_ALIAS,
68 .per_device_auto_alloc_size = sizeof(struct dma_dev_priv),