arc/mm/dma.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
6 #include <linux/dma-map-ops.h>
12  *  - hardware IOC not available (or "dma-coherent" not set for device in DT)
13  *  - But still handle both coherent and non-coherent requests from caller
15  * For DMA coherent hardware (IOC) generic code suffices
23 	 * Yeah this bit us - STAR 9000898266  in arch_dma_prep_coherent()
37  * dma-mapping: provide a generic dma-noncoherent implementation)"
40  *          |----------------------------------------------------------------
48  * upper layer functions (in include/linux/dma-mapping.h)
93 void arch_setup_dma_ops(struct device *dev, bool coherent)  in arch_setup_dma_ops()  argument
97 	 * with memory - eliding need for any explicit cache maintenance of  in arch_setup_dma_ops()
100 	if (is_isa_arcv2() && ioc_enable && coherent)  in arch_setup_dma_ops()
101 		dev->dma_coherent = true;  in arch_setup_dma_ops()
104 		 dev->dma_coherent ? "" : "non");  in arch_setup_dma_ops()