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55 lines
1.2 KiB
55 lines
1.2 KiB
// 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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EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_register); |
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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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EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_free);
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