80 строки
1.9 KiB
C
80 строки
1.9 KiB
C
/*
|
|
* SHDMA Device Tree glue
|
|
*
|
|
* Copyright (C) 2013 Renesas Electronics Inc.
|
|
* Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
|
|
*
|
|
* This is free software; you can redistribute it and/or modify
|
|
* it under the terms of version 2 of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#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>");
|