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 dw_dma *dw = to_dw_dma(chan->device); 12 struct dw_dma_chip_pdata *data = dev_get_drvdata(dw->dma.dev); 13 struct acpi_dma_spec *dma_spec = param; 14 struct dw_dma_slave slave = { 15 .dma_dev = dma_spec->dev, 16 .src_id = dma_spec->slave_id, 17 .dst_id = dma_spec->slave_id, 18 .m_master = data->m_master, 19 .p_master = data->p_master, 20 }; 21 22 return dw_dma_filter(chan, &slave); 23 } 24 25 void dw_dma_acpi_controller_register(struct dw_dma *dw) 26 { 27 struct device *dev = dw->dma.dev; 28 struct acpi_dma_filter_info *info; 29 int ret; 30 31 if (!has_acpi_companion(dev)) 32 return; 33 34 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); 35 if (!info) 36 return; 37 38 dma_cap_zero(info->dma_cap); 39 dma_cap_set(DMA_SLAVE, info->dma_cap); 40 info->filter_fn = dw_dma_acpi_filter; 41 42 ret = acpi_dma_controller_register(dev, acpi_dma_simple_xlate, info); 43 if (ret) 44 dev_err(dev, "could not register acpi_dma_controller\n"); 45 } 46 EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_register); 47 48 void dw_dma_acpi_controller_free(struct dw_dma *dw) 49 { 50 struct device *dev = dw->dma.dev; 51 52 if (!has_acpi_companion(dev)) 53 return; 54 55 acpi_dma_controller_free(dev); 56 } 57 EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_free); 58