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/*
* DMA Mapping glue for ARC
*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef ASM_ARC_DMA_MAPPING_H
#define ASM_ARC_DMA_MAPPING_H
#include <asm-generic/dma-coherent.h>
#include <asm/cacheflush.h>
#ifndef CONFIG_ARC_PLAT_NEEDS_CPU_TO_DMA
/*
* dma_map_* API take cpu addresses, which is kernel logical address in the
* untranslated address space (0x8000_0000) based. The dma address (bus addr)
* ideally needs to be 0x0000_0000 based hence these glue routines.
* However given that intermediate bus bridges can ignore the high bit, we can
* do with these routines being no-ops.
* If a platform/device comes up which sriclty requires 0 based bus addr
* (e.g. AHB-PCI bridge on Angel4 board), then it can provide it's own versions
*/
#define plat_dma_addr_to_kernel(dev, addr) ((unsigned long)(addr))
#define plat_kernel_addr_to_dma(dev, ptr) ((dma_addr_t)(ptr))
#else
#include <plat/dma_addr.h>
#endif
void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle);
void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp);
void dma_free_coherent(struct device *dev, size_t size, void *kvaddr,
dma_addr_t dma_handle);
/* drivers/base/dma-mapping.c */
extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size);
extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t dma_addr,
size_t size);
#define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
#define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
/*
* streaming DMA Mapping API...
* CPU accesses page via normal paddr, thus needs to explicitly made
* consistent before each use
*/
static inline void __inline_dma_cache_sync(unsigned long paddr, size_t size,
enum dma_data_direction dir)
{
switch (dir) {
case DMA_FROM_DEVICE:
dma_cache_inv(paddr, size);
break;
case DMA_TO_DEVICE:
dma_cache_wback(paddr, size);
break;
case DMA_BIDIRECTIONAL:
dma_cache_wback_inv(paddr, size);
break;
default:
pr_err("Invalid DMA dir [%d] for OP @ %lx\n", dir, paddr);
}
}
void __arc_dma_cache_sync(unsigned long paddr, size_t size,
enum dma_data_direction dir);
#define _dma_cache_sync(addr, sz, dir) \
do { \
if (__builtin_constant_p(dir)) \
__inline_dma_cache_sync(addr, sz, dir); \
else \
__arc_dma_cache_sync(addr, sz, dir); \
} \
while (0);
static inline dma_addr_t
dma_map_single(struct device *dev, void *cpu_addr, size_t size,
enum dma_data_direction dir)
{
_dma_cache_sync((unsigned long)cpu_addr, size, dir);
return plat_kernel_addr_to_dma(dev, cpu_addr);
}
static inline void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr,
size_t size, enum dma_data_direction dir)
{
}
static inline dma_addr_t
dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir)
{
unsigned long paddr = page_to_phys(page) + offset;
return dma_map_single(dev, (void *)paddr, size, dir);
}
static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir)
{
}
static inline int
dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir)
{
struct scatterlist *s;
int i;
for_each_sg(sg, s, nents, i)
s->dma_address = dma_map_page(dev, sg_page(s), s->offset,
s->length, dir);
return nents;
}
static inline void
dma_unmap_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir)
{
struct scatterlist *s;
int i;
for_each_sg(sg, s, nents, i)
dma_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir);
}
static inline void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir)
{
_dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,
DMA_FROM_DEVICE);
}
static inline void
dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir)
{
_dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle), size,
DMA_TO_DEVICE);
}
static inline void
dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
unsigned long offset, size_t size,
enum dma_data_direction direction)
{
_dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,
size, DMA_FROM_DEVICE);
}
static inline void
dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
unsigned long offset, size_t size,
enum dma_data_direction direction)
{
_dma_cache_sync(plat_dma_addr_to_kernel(dev, dma_handle) + offset,
size, DMA_TO_DEVICE);
}
static inline void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction dir)
{
int i;
for (i = 0; i < nelems; i++, sg++)
_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
}
static inline void
dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction dir)
{
int i;
for (i = 0; i < nelems; i++, sg++)
_dma_cache_sync((unsigned int)sg_virt(sg), sg->length, dir);
}
static inline int dma_supported(struct device *dev, u64 dma_mask)
{
/* Support 32 bit DMA mask exclusively */
return dma_mask == DMA_BIT_MASK(32);
}
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
return 0;
}
static inline int dma_set_mask(struct device *dev, u64 dma_mask)
{
if (!dev->dma_mask || !dma_supported(dev, dma_mask))
return -EIO;
*dev->dma_mask = dma_mask;
return 0;
}
#endif
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