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https://github.com/brain-hackers/u-boot-brain
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d024236e5a
We have a large number of places where while we historically referenced gd in the code we no longer do, as well as cases where the code added that line "just in case" during development and never dropped it. Signed-off-by: Tom Rini <trini@konsulko.com>
71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/*
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* Direct Memory Access U-Class driver
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*
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* (C) Copyright 2015
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* Texas Instruments Incorporated, <www.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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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dma.h>
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#include <dm.h>
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#include <dm/uclass-internal.h>
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#include <dm/device-internal.h>
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#include <errno.h>
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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_err("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_alloc_size = sizeof(struct dma_dev_priv),
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};
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