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