projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b685fe26 AS |
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 | ||
| 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 | ||
| 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 | } | |
| 38e4fb66 | 44 | EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_register); |
| b685fe26 AS |
45 | |
| 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 | } | |
| 38e4fb66 | 55 | EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_free); |