mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
70 lines
1.5 KiB
C
70 lines
1.5 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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* (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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#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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