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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2013,2019 Intel Corporation
#include <linux/acpi.h>
#include <linux/acpi_dma.h>
#include "internal.h"
static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
{
struct acpi_dma_spec *dma_spec = param;
struct dw_dma_slave slave = {
.dma_dev = dma_spec->dev,
.src_id = dma_spec->slave_id,
.dst_id = dma_spec->slave_id,
.m_master = 0,
.p_master = 1,
};
return dw_dma_filter(chan, &slave);
}
void dw_dma_acpi_controller_register(struct dw_dma *dw)
{
struct device *dev = dw->dma.dev;
struct acpi_dma_filter_info *info;
int ret;
if (!has_acpi_companion(dev))
return;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return;
dma_cap_zero(info->dma_cap);
dma_cap_set(DMA_SLAVE, info->dma_cap);
info->filter_fn = dw_dma_acpi_filter;
ret = acpi_dma_controller_register(dev, acpi_dma_simple_xlate, info);
if (ret)
dev_err(dev, "could not register acpi_dma_controller\n");
}
EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_register);
void dw_dma_acpi_controller_free(struct dw_dma *dw)
{
struct device *dev = dw->dma.dev;
if (!has_acpi_companion(dev))
return;
acpi_dma_controller_free(dev);
}
EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_free);
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