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 } 44 EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_register); 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 } 55 EXPORT_SYMBOL_GPL(dw_dma_acpi_controller_free); 56