Merge branch 'master' of git://git.denx.de/u-boot-spi
[platform/kernel/u-boot.git] / drivers / dma / dma-uclass.c
1 /*
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
19 DECLARE_GLOBAL_DATA_PTR;
20
21 int 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
46 int 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
67 UCLASS_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 };