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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

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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);