blob: ea21fd9c6febdc0b08064419cbc178805ea09250 [file] [log] [blame]
Mugunthan V Na0594ce2016-02-15 15:31:37 +05301/*
2 * Direct Memory Access U-Class driver
3 *
4 * (C) Copyright 2015
5 * Texas Instruments Incorporated, <www.ti.com>
6 *
7 * Author: Mugunthan V N <mugunthanvnm@ti.com>
8 *
9 * SPDX-License-Identifier: GPL-2.0+
10 */
11
12#include <common.h>
13#include <dma.h>
14#include <dm.h>
15#include <dm/uclass-internal.h>
16#include <dm/device-internal.h>
17#include <errno.h>
18
19DECLARE_GLOBAL_DATA_PTR;
20
21int dma_get_device(u32 transfer_type, struct udevice **devp)
22{
23 struct udevice *dev;
24 int ret;
25
26 for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret;
27 ret = uclass_next_device(&dev)) {
28 struct dma_dev_priv *uc_priv;
29
30 uc_priv = dev_get_uclass_priv(dev);
31 if (uc_priv->supported & transfer_type)
32 break;
33 }
34
35 if (!dev) {
36 error("No DMA device found that supports %x type\n",
37 transfer_type);
38 return -EPROTONOSUPPORT;
39 }
40
41 *devp = dev;
42
43 return ret;
44}
45
46int dma_memcpy(void *dst, void *src, size_t len)
47{
48 struct udevice *dev;
49 const struct dma_ops *ops;
50 int ret;
51
52 ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev);
53 if (ret < 0)
54 return ret;
55
56 ops = device_get_ops(dev);
57 if (!ops->transfer)
58 return -ENOSYS;
59
60 /* Invalidate the area, so no writeback into the RAM races with DMA */
61 invalidate_dcache_range((unsigned long)dst, (unsigned long)dst +
62 roundup(len, ARCH_DMA_MINALIGN));
63
64 return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len);
65}
66
67UCLASS_DRIVER(dma) = {
68 .id = UCLASS_DMA,
69 .name = "dma",
70 .flags = DM_UC_FLAG_SEQ_ALIAS,
71 .per_device_auto_alloc_size = sizeof(struct dma_dev_priv),
72};