https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: a99d8080aaf358d5d23581244e5da23b35e340b9 authored by Linus Torvalds on 03 November 2019, 22:07:26 UTC
Linux 5.4-rc6
Linux 5.4-rc6
Tip revision: a99d808
shdma-of.c
// SPDX-License-Identifier: GPL-2.0
/*
* SHDMA Device Tree glue
*
* Copyright (C) 2013 Renesas Electronics Inc.
* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
*/
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_dma.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/shdma-base.h>
#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
static struct dma_chan *shdma_of_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
u32 id = dma_spec->args[0];
dma_cap_mask_t mask;
struct dma_chan *chan;
if (dma_spec->args_count != 1)
return NULL;
dma_cap_zero(mask);
/* Only slave DMA channels can be allocated via DT */
dma_cap_set(DMA_SLAVE, mask);
chan = dma_request_channel(mask, shdma_chan_filter,
(void *)(uintptr_t)id);
if (chan)
to_shdma_chan(chan)->hw_req = id;
return chan;
}
static int shdma_of_probe(struct platform_device *pdev)
{
const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
int ret;
ret = of_dma_controller_register(pdev->dev.of_node,
shdma_of_xlate, pdev);
if (ret < 0)
return ret;
ret = of_platform_populate(pdev->dev.of_node, NULL, lookup, &pdev->dev);
if (ret < 0)
of_dma_controller_free(pdev->dev.of_node);
return ret;
}
static const struct of_device_id shdma_of_match[] = {
{ .compatible = "renesas,shdma-mux", },
{ }
};
MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
static struct platform_driver shdma_of = {
.driver = {
.name = "shdma-of",
.of_match_table = shdma_of_match,
},
.probe = shdma_of_probe,
};
module_platform_driver(shdma_of);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("SH-DMA driver DT glue");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");