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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
258 lines
5.1 KiB
C
258 lines
5.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Direct Memory Access U-Class driver
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*
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* Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
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* Copyright (C) 2015 - 2018 Texas Instruments Incorporated <www.ti.com>
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* Written by Mugunthan V N <mugunthanvnm@ti.com>
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*
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* Author: Mugunthan V N <mugunthanvnm@ti.com>
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*/
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#include <common.h>
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#include <cpu_func.h>
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#include <dm.h>
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#include <log.h>
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#include <malloc.h>
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#include <asm/cache.h>
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#include <dm/read.h>
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#include <dma-uclass.h>
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#include <dt-structs.h>
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#include <errno.h>
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#ifdef CONFIG_DMA_CHANNELS
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static inline struct dma_ops *dma_dev_ops(struct udevice *dev)
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{
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return (struct dma_ops *)dev->driver->ops;
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}
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# if CONFIG_IS_ENABLED(OF_CONTROL)
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static int dma_of_xlate_default(struct dma *dma,
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struct ofnode_phandle_args *args)
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{
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debug("%s(dma=%p)\n", __func__, dma);
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if (args->args_count > 1) {
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pr_err("Invaild args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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if (args->args_count)
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dma->id = args->args[0];
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else
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dma->id = 0;
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return 0;
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}
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int dma_get_by_index(struct udevice *dev, int index, struct dma *dma)
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{
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int ret;
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struct ofnode_phandle_args args;
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struct udevice *dev_dma;
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const struct dma_ops *ops;
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debug("%s(dev=%p, index=%d, dma=%p)\n", __func__, dev, index, dma);
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assert(dma);
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dma->dev = NULL;
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ret = dev_read_phandle_with_args(dev, "dmas", "#dma-cells", 0, index,
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&args);
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if (ret) {
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pr_err("%s: dev_read_phandle_with_args failed: err=%d\n",
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__func__, ret);
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return ret;
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}
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ret = uclass_get_device_by_ofnode(UCLASS_DMA, args.node, &dev_dma);
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if (ret) {
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pr_err("%s: uclass_get_device_by_ofnode failed: err=%d\n",
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__func__, ret);
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return ret;
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}
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dma->dev = dev_dma;
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ops = dma_dev_ops(dev_dma);
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if (ops->of_xlate)
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ret = ops->of_xlate(dma, &args);
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else
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ret = dma_of_xlate_default(dma, &args);
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if (ret) {
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pr_err("of_xlate() failed: %d\n", ret);
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return ret;
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}
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return dma_request(dev_dma, dma);
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}
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int dma_get_by_name(struct udevice *dev, const char *name, struct dma *dma)
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{
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int index;
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debug("%s(dev=%p, name=%s, dma=%p)\n", __func__, dev, name, dma);
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dma->dev = NULL;
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index = dev_read_stringlist_search(dev, "dma-names", name);
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if (index < 0) {
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pr_err("dev_read_stringlist_search() failed: %d\n", index);
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return index;
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}
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return dma_get_by_index(dev, index, dma);
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}
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# endif /* OF_CONTROL */
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int dma_request(struct udevice *dev, struct dma *dma)
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{
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struct dma_ops *ops = dma_dev_ops(dev);
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debug("%s(dev=%p, dma=%p)\n", __func__, dev, dma);
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dma->dev = dev;
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if (!ops->request)
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return 0;
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return ops->request(dma);
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}
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int dma_free(struct dma *dma)
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{
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struct dma_ops *ops = dma_dev_ops(dma->dev);
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debug("%s(dma=%p)\n", __func__, dma);
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if (!ops->rfree)
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return 0;
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return ops->rfree(dma);
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}
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int dma_enable(struct dma *dma)
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{
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struct dma_ops *ops = dma_dev_ops(dma->dev);
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debug("%s(dma=%p)\n", __func__, dma);
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if (!ops->enable)
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return -ENOSYS;
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return ops->enable(dma);
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}
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int dma_disable(struct dma *dma)
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{
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struct dma_ops *ops = dma_dev_ops(dma->dev);
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debug("%s(dma=%p)\n", __func__, dma);
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if (!ops->disable)
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return -ENOSYS;
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return ops->disable(dma);
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}
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int dma_prepare_rcv_buf(struct dma *dma, void *dst, size_t size)
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{
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struct dma_ops *ops = dma_dev_ops(dma->dev);
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debug("%s(dma=%p)\n", __func__, dma);
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if (!ops->prepare_rcv_buf)
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return -1;
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return ops->prepare_rcv_buf(dma, dst, size);
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}
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int dma_receive(struct dma *dma, void **dst, void *metadata)
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{
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struct dma_ops *ops = dma_dev_ops(dma->dev);
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debug("%s(dma=%p)\n", __func__, dma);
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if (!ops->receive)
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return -ENOSYS;
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return ops->receive(dma, dst, metadata);
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}
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int dma_send(struct dma *dma, void *src, size_t len, void *metadata)
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{
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struct dma_ops *ops = dma_dev_ops(dma->dev);
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debug("%s(dma=%p)\n", __func__, dma);
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if (!ops->send)
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return -ENOSYS;
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return ops->send(dma, src, len, metadata);
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}
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int dma_get_cfg(struct dma *dma, u32 cfg_id, void **cfg_data)
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{
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struct dma_ops *ops = dma_dev_ops(dma->dev);
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debug("%s(dma=%p)\n", __func__, dma);
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if (!ops->get_cfg)
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return -ENOSYS;
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return ops->get_cfg(dma, cfg_id, cfg_data);
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}
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#endif /* CONFIG_DMA_CHANNELS */
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int dma_get_device(u32 transfer_type, struct udevice **devp)
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{
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struct udevice *dev;
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int ret;
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for (ret = uclass_first_device(UCLASS_DMA, &dev); dev && !ret;
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ret = uclass_next_device(&dev)) {
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struct dma_dev_priv *uc_priv;
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uc_priv = dev_get_uclass_priv(dev);
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if (uc_priv->supported & transfer_type)
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break;
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}
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if (!dev) {
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pr_debug("No DMA device found that supports %x type\n",
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transfer_type);
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return -EPROTONOSUPPORT;
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}
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*devp = dev;
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return ret;
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}
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int dma_memcpy(void *dst, void *src, size_t len)
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{
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struct udevice *dev;
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const struct dma_ops *ops;
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int ret;
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ret = dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev);
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if (ret < 0)
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return ret;
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ops = device_get_ops(dev);
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if (!ops->transfer)
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return -ENOSYS;
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/* Invalidate the area, so no writeback into the RAM races with DMA */
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invalidate_dcache_range((unsigned long)dst, (unsigned long)dst +
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roundup(len, ARCH_DMA_MINALIGN));
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return ops->transfer(dev, DMA_MEM_TO_MEM, dst, src, len);
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}
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UCLASS_DRIVER(dma) = {
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.id = UCLASS_DMA,
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.name = "dma",
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.per_device_auto = sizeof(struct dma_dev_priv),
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};
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