1/*
  2 * OpenRISC Linux
  3 *
  4 * Linux architectural port borrowing liberally from similar works of
  5 * others.  All original copyrights apply as per the original source
  6 * declaration.
  7 *
  8 * OpenRISC implementation:
  9 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 10 *
 11 * This program is free software; you can redistribute it and/or modify
 12 * it under the terms of the GNU General Public License as published by
 13 * the Free Software Foundation; either version 2 of the License, or
 14 * (at your option) any later version.
 15 */
 16
 17#ifndef __ASM_OPENRISC_DMA_MAPPING_H
 18#define __ASM_OPENRISC_DMA_MAPPING_H
 19
 20/*
 21 * See Documentation/DMA-API-HOWTO.txt and
 22 * Documentation/DMA-API.txt for documentation.
 23 */
 24
 25#include <linux/dma-debug.h>
 26#include <asm-generic/dma-coherent.h>
 27#include <linux/kmemcheck.h>
 28#include <linux/dma-mapping.h>
 29
 30#define DMA_ERROR_CODE		(~(dma_addr_t)0x0)
 31
 32extern struct dma_map_ops or1k_dma_map_ops;
 33
 34static inline struct dma_map_ops *get_dma_ops(struct device *dev)
 35{
 36	return &or1k_dma_map_ops;
 37}
 38
 39#include <asm-generic/dma-mapping-common.h>
 40
 41#define dma_alloc_coherent(d,s,h,f) dma_alloc_attrs(d,s,h,f,NULL) 
 42
 43static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 44				    dma_addr_t *dma_handle, gfp_t gfp,
 45				    struct dma_attrs *attrs)
 46{
 47	struct dma_map_ops *ops = get_dma_ops(dev);
 48	void *memory;
 49
 50	memory = ops->alloc(dev, size, dma_handle, gfp, attrs);
 51
 52	debug_dma_alloc_coherent(dev, size, *dma_handle, memory);
 53
 54	return memory;
 55}
 56
 57#define dma_free_coherent(d,s,c,h) dma_free_attrs(d,s,c,h,NULL)
 58
 59static inline void dma_free_attrs(struct device *dev, size_t size,
 60				  void *cpu_addr, dma_addr_t dma_handle,
 61				  struct dma_attrs *attrs)
 62{
 63	struct dma_map_ops *ops = get_dma_ops(dev);
 64
 65	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
 66
 67	ops->free(dev, size, cpu_addr, dma_handle, attrs);
 68}
 69
 70static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 71					  dma_addr_t *dma_handle, gfp_t gfp)
 72{
 73	struct dma_attrs attrs;
 74
 75	dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
 76
 77	return dma_alloc_attrs(dev, size, dma_handle, gfp, &attrs);
 78}
 79
 80static inline void dma_free_noncoherent(struct device *dev, size_t size,
 81					 void *cpu_addr, dma_addr_t dma_handle)
 82{
 83	struct dma_attrs attrs;
 84
 85	dma_set_attr(DMA_ATTR_NON_CONSISTENT, &attrs);
 86
 87	dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
 88}
 89
 90static inline int dma_supported(struct device *dev, u64 dma_mask)
 91{
 92	/* Support 32 bit DMA mask exclusively */
 93	return dma_mask == DMA_BIT_MASK(32);
 94}
 95
 96static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 97{
 98	return 0;
 99}
100
101static inline int dma_set_mask(struct device *dev, u64 dma_mask)
102{
103	if (!dev->dma_mask || !dma_supported(dev, dma_mask))
104		return -EIO;
105
106	*dev->dma_mask = dma_mask;
107
108	return 0;
109}
110#endif	/* __ASM_OPENRISC_DMA_MAPPING_H */