LXR uboot/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
  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                pr_err("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};
  73