drivers/dma/bcm2835-dma.c

697 	struct bcm2835_dmadev *od = to_bcm2835_dma_dev(chan->device);
750 		if (buf_addr == od->zero_page && !c->is_lite_channel)
842 static void bcm2835_dma_free(struct bcm2835_dmadev *od)
846 	list_for_each_entry_safe(c, next, &od->ddev.channels,
852 	dma_unmap_page_attrs(od->ddev.dev, od->zero_page, PAGE_SIZE,
880 	struct bcm2835_dmadev *od;
898 	od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
899 	if (!od)
908 	od->base = base;
910 	dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
911 	dma_cap_set(DMA_PRIVATE, od->ddev.cap_mask);
912 	dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask);
913 	dma_cap_set(DMA_MEMCPY, od->ddev.cap_mask);
914 	od->ddev.device_alloc_chan_resources = bcm2835_dma_alloc_chan_resources;
915 	od->ddev.device_free_chan_resources = bcm2835_dma_free_chan_resources;
916 	od->ddev.device_tx_status = bcm2835_dma_tx_status;
917 	od->ddev.device_issue_pending = bcm2835_dma_issue_pending;
918 	od->ddev.device_prep_dma_cyclic = bcm2835_dma_prep_dma_cyclic;
919 	od->ddev.device_prep_slave_sg = bcm2835_dma_prep_slave_sg;
920 	od->ddev.device_prep_dma_memcpy = bcm2835_dma_prep_dma_memcpy;
921 	od->ddev.device_config = bcm2835_dma_slave_config;
922 	od->ddev.device_terminate_all = bcm2835_dma_terminate_all;
923 	od->ddev.device_synchronize = bcm2835_dma_synchronize;
924 	od->ddev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
925 	od->ddev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
926 	od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
928 	od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
929 	od->ddev.descriptor_reuse = true;
930 	od->ddev.dev = &pdev->dev;
931 	INIT_LIST_HEAD(&od->ddev.channels);
933 	platform_set_drvdata(pdev, od);
935 	od->zero_page = dma_map_page_attrs(od->ddev.dev, ZERO_PAGE(0), 0,
938 	if (dma_mapping_error(od->ddev.dev, od->zero_page)) {
991 		rc = bcm2835_dma_chan_init(od, i, irq[i], irq_flags);
1000 			bcm2835_dma_xlate, od);
1006 	rc = dma_async_device_register(&od->ddev);
1018 	bcm2835_dma_free(od);
1024 	struct bcm2835_dmadev *od = platform_get_drvdata(pdev);
1026 	dma_async_device_unregister(&od->ddev);
1027 	bcm2835_dma_free(od);