79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* 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-debug.h>
|
|
#include <asm/io.h>
|
|
#include <asm/swiotlb.h>
|
|
|
|
/* Some dma direct funcs must be visible for use in other dma_ops */
|
|
extern void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flag,
|
|
unsigned long attrs);
|
|
extern void __dma_nommu_free_coherent(struct device *dev, size_t size,
|
|
void *vaddr, dma_addr_t dma_handle,
|
|
unsigned long attrs);
|
|
|
|
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 const struct dma_map_ops dma_iommu_ops;
|
|
#endif
|
|
extern const struct dma_map_ops dma_nommu_ops;
|
|
|
|
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
|
|
{
|
|
/* 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.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* get_dma_offset()
|
|
*
|
|
* Get the dma offset on configurations where the dma address can be determined
|
|
* from the physical address by looking at a simple offset. Direct dma and
|
|
* swiotlb use this function, but it is typically not used by implementations
|
|
* with an iommu.
|
|
*/
|
|
static inline dma_addr_t get_dma_offset(struct device *dev)
|
|
{
|
|
if (dev)
|
|
return dev->archdata.dma_offset;
|
|
|
|
return PCI_DRAM_OFFSET;
|
|
}
|
|
|
|
static inline void set_dma_offset(struct device *dev, dma_addr_t off)
|
|
{
|
|
if (dev)
|
|
dev->archdata.dma_offset = off;
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _ASM_DMA_MAPPING_H */
|