1 /* 2 * Copyright (c) 2016 Sascha Wildner <saw@online.de> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <linux/dma-mapping.h> 28 29 #include <vm/vm_extern.h> 30 31 void * 32 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, 33 gfp_t flag) 34 { 35 vm_paddr_t high; 36 size_t align; 37 void *mem; 38 39 #if 0 /* XXX swildner */ 40 if (dev->dma_mask) 41 high = *dev->dma_mask; 42 else 43 #endif 44 high = BUS_SPACE_MAXADDR_32BIT; 45 align = PAGE_SIZE << get_order(size); 46 mem = (void *)kmem_alloc_contig(size, 0, high, align); 47 if (mem) 48 *dma_handle = vtophys(mem); 49 else 50 *dma_handle = 0; 51 return (mem); 52 } 53 54 void 55 dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, 56 dma_addr_t dma_handle) 57 { 58 59 kmem_free(kernel_map, (vm_offset_t)cpu_addr, size); 60 } 61