1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2013,2019 Intel Corporation
3
4 #include <linux/acpi.h>
5 #include <linux/acpi_dma.h>
6
7 #include "internal.h"
8
dw_dma_acpi_filter(struct dma_chan * chan,void * param)9 static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
10 {
11 struct acpi_dma_spec *dma_spec = param;
12 struct dw_dma_slave slave = {
13 .dma_dev = dma_spec->dev,
14 .src_id = dma_spec->slave_id,
15 .dst_id = dma_spec->slave_id,
16 .m_master = 0,
17 .p_master = 1,
18 };
19
20 return dw_dma_filter(chan, &slave);
21 }
22
dw_dma_acpi_controller_register(struct dw_dma * dw)23 void dw_dma_acpi_controller_register(struct dw_dma *dw)
24 {
25 struct device *dev = dw->dma.dev;
26 struct acpi_dma_filter_info *info;
27 int ret;
28
29 if (!has_acpi_companion(dev))
30 return;
31
32 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
33 if (!info)
34 return;
35
36 dma_cap_zero(info->dma_cap);
37 dma_cap_set(DMA_SLAVE, info->dma_cap);
38 info->filter_fn = dw_dma_acpi_filter;
39
40 ret = acpi_dma_controller_register(dev, acpi_dma_simple_xlate, info);
41 if (ret)
42 dev_err(dev, "could not register acpi_dma_controller\n");
43 }
44 EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_register);
45
dw_dma_acpi_controller_free(struct dw_dma * dw)46 void dw_dma_acpi_controller_free(struct dw_dma *dw)
47 {
48 struct device *dev = dw->dma.dev;
49
50 if (!has_acpi_companion(dev))
51 return;
52
53 acpi_dma_controller_free(dev);
54 }
55 EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_free);
56