1/*
 2 * DMA operations for the Hexagon architecture
 3 *
 4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License version 2 and
 8 * only version 2 as published by the Free Software Foundation.
 9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA.
19 */
20
21#ifndef _ASM_DMA_MAPPING_H
22#define _ASM_DMA_MAPPING_H
23
24#include <linux/types.h>
25#include <linux/cache.h>
26#include <linux/mm.h>
27#include <linux/scatterlist.h>
28#include <linux/dma-debug.h>
 
29#include <asm/io.h>
30
31struct device;
 
32
33extern const struct dma_map_ops *dma_ops;
34
35static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 
 
 
36{
 
 
 
37	return dma_ops;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
38}
39
40#endif

  1/*
  2 * DMA operations for the Hexagon architecture
  3 *
  4 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
  5 *
  6 * This program is free software; you can redistribute it and/or modify
  7 * it under the terms of the GNU General Public License version 2 and
  8 * only version 2 as published by the Free Software Foundation.
  9 *
 10 * This program is distributed in the hope that it will be useful,
 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13 * GNU General Public License for more details.
 14 *
 15 * You should have received a copy of the GNU General Public License
 16 * along with this program; if not, write to the Free Software
 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 18 * 02110-1301, USA.
 19 */
 20
 21#ifndef _ASM_DMA_MAPPING_H
 22#define _ASM_DMA_MAPPING_H
 23
 24#include <linux/types.h>
 25#include <linux/cache.h>
 26#include <linux/mm.h>
 27#include <linux/scatterlist.h>
 28#include <linux/dma-debug.h>
 29#include <linux/dma-attrs.h>
 30#include <asm/io.h>
 31
 32struct device;
 33extern int bad_dma_address;
 34
 35extern struct dma_map_ops *dma_ops;
 36
 37#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
 38#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
 39
 40static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 41{
 42	if (unlikely(dev == NULL))
 43		return NULL;
 44
 45	return dma_ops;
 46}
 47
 48extern int dma_supported(struct device *dev, u64 mask);
 49extern int dma_set_mask(struct device *dev, u64 mask);
 50extern int dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
 51extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 52			   enum dma_data_direction direction);
 53
 54#include <asm-generic/dma-mapping-common.h>
 55
 56static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 57{
 58	if (!dev->dma_mask)
 59		return 0;
 60	return addr + size - 1 <= *dev->dma_mask;
 61}
 62
 63static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 64{
 65	struct dma_map_ops *dma_ops = get_dma_ops(dev);
 66
 67	if (dma_ops->mapping_error)
 68		return dma_ops->mapping_error(dev, dma_addr);
 69
 70	return (dma_addr == bad_dma_address);
 71}
 72
 73#define dma_alloc_coherent(d,s,h,f)	dma_alloc_attrs(d,s,h,f,NULL)
 74
 75static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 76				    dma_addr_t *dma_handle, gfp_t flag,
 77				    struct dma_attrs *attrs)
 78{
 79	void *ret;
 80	struct dma_map_ops *ops = get_dma_ops(dev);
 81
 82	BUG_ON(!dma_ops);
 83
 84	ret = ops->alloc(dev, size, dma_handle, flag, attrs);
 85
 86	debug_dma_alloc_coherent(dev, size, *dma_handle, ret);
 87
 88	return ret;
 89}
 90
 91#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
 92
 93static inline void dma_free_attrs(struct device *dev, size_t size,
 94				  void *cpu_addr, dma_addr_t dma_handle,
 95				  struct dma_attrs *attrs)
 96{
 97	struct dma_map_ops *dma_ops = get_dma_ops(dev);
 98
 99	BUG_ON(!dma_ops);
100
101	dma_ops->free(dev, size, cpu_addr, dma_handle, attrs);
102
103	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
104}
105
106#endif