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/*
* Copyright (C) 2004 IBM
*
* Implements the generic device dma API for powerpc.
* the pci and vio busses
*/
#ifndef _ASM_DMA_MAPPING_H
#define _ASM_DMA_MAPPING_H
#ifdef __KERNEL__
#include <linux/types.h>
#include <linux/cache.h>
/* need struct page definitions */
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/dma-attrs.h>
#include <linux/dma-debug.h>
#include <asm/io.h>
#include <asm/swiotlb.h>
#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
/* Some dma direct funcs must be visible for use in other dma_ops */
extern void *dma_direct_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag);
extern void dma_direct_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle);
extern unsigned long get_dma_direct_offset(struct device *dev);
#ifdef CONFIG_NOT_COHERENT_CACHE
/*
* DMA-consistent mapping functions for PowerPCs that don't support
* cache snooping. These allocate/free a region of uncached mapped
* memory space for use with DMA devices. Alternatively, you could
* allocate the space "normally" and use the cache management functions
* to ensure it is consistent.
*/
struct device;
extern void *__dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t gfp);
extern void __dma_free_coherent(size_t size, void *vaddr);
extern void __dma_sync(void *vaddr, size_t size, int direction);
extern void __dma_sync_page(struct page *page, unsigned long offset,
size_t size, int direction);
#else /* ! CONFIG_NOT_COHERENT_CACHE */
/*
* Cache coherent cores.
*/
#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
#define __dma_free_coherent(size, addr) ((void)0)
#define __dma_sync(addr, size, rw) ((void)0)
#define __dma_sync_page(pg, off, sz, rw) ((void)0)
#endif /* ! CONFIG_NOT_COHERENT_CACHE */
static inline unsigned long device_to_mask(struct device *dev)
{
if (dev->dma_mask && *dev->dma_mask)
return *dev->dma_mask;
/* Assume devices without mask can take 32 bit addresses */
return 0xfffffffful;
}
/*
* Available generic sets of operations
*/
#ifdef CONFIG_PPC64
extern struct dma_map_ops dma_iommu_ops;
#endif
extern struct dma_map_ops dma_direct_ops;
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
{
/* We don't handle the NULL dev case for ISA for now. We could
* do it via an out of line call but it is not needed for now. The
* only ISA DMA device we support is the floppy and we have a hack
* in the floppy driver directly to get a device for us.
*/
if (unlikely(dev == NULL))
return NULL;
return dev->archdata.dma_ops;
}
static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
{
dev->archdata.dma_ops = ops;
}
/* this will be removed soon */
#define flush_write_buffers()
#include <asm-generic/dma-mapping-common.h>
static inline int dma_supported(struct device *dev, u64 mask)
{
struct dma_map_ops *dma_ops = get_dma_ops(dev);
if (unlikely(dma_ops == NULL))
return 0;
if (dma_ops->dma_supported == NULL)
return 1;
return dma_ops->dma_supported(dev, mask);
}
/* We have our own implementation of pci_set_dma_mask() */
#define HAVE_ARCH_PCI_SET_DMA_MASK
static inline int dma_set_mask(struct device *dev, u64 dma_mask)
{
struct dma_map_ops *dma_ops = get_dma_ops(dev);
if (unlikely(dma_ops == NULL))
return -EIO;
if (dma_ops->set_dma_mask != NULL)
return dma_ops->set_dma_mask(dev, dma_mask);
if (!dev->dma_mask || !dma_supported(dev, dma_mask))
return -EIO;
*dev->dma_mask = dma_mask;
return 0;
}
static inline void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
struct dma_map_ops *dma_ops = get_dma_ops(dev);
void *cpu_addr;
BUG_ON(!dma_ops);
cpu_addr = dma_ops->alloc_coherent(dev, size, dma_handle, flag);
debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
return cpu_addr;
}
static inline void dma_free_coherent(struct device *dev, size_t size,
void *cpu_addr, dma_addr_t dma_handle)
{
struct dma_map_ops *dma_ops = get_dma_ops(dev);
BUG_ON(!dma_ops);
debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
}
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
struct dma_map_ops *dma_ops = get_dma_ops(dev);
if (dma_ops->mapping_error)
return dma_ops->mapping_error(dev, dma_addr);
#ifdef CONFIG_PPC64
return (dma_addr == DMA_ERROR_CODE);
#else
return 0;
#endif
}
static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
{
#ifdef CONFIG_SWIOTLB
struct dev_archdata *sd = &dev->archdata;
if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
return 0;
#endif
if (!dev->dma_mask)
return 0;
return addr + size <= *dev->dma_mask;
}
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
return paddr + get_dma_direct_offset(dev);
}
static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
{
return daddr - get_dma_direct_offset(dev);
}
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
#ifdef CONFIG_NOT_COHERENT_CACHE
#define dma_is_consistent(d, h) (0)
#else
#define dma_is_consistent(d, h) (1)
#endif
static inline int dma_get_cache_alignment(void)
{
#ifdef CONFIG_PPC64
/* no easy way to get cache size on all processors, so return
* the maximum possible, to be safe */
return (1 << INTERNODE_CACHE_SHIFT);
#else
/*
* Each processor family will define its own L1_CACHE_SHIFT,
* L1_CACHE_BYTES wraps to this, so this is always safe.
*/
return L1_CACHE_BYTES;
#endif
}
static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction)
{
BUG_ON(direction == DMA_NONE);
__dma_sync(vaddr, size, (int)direction);
}
#endif /* __KERNEL__ */
#endif /* _ASM_DMA_MAPPING_H */
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