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Add missing DMA ops

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For the initial architecture submission, not all of the DMA ops were
implemented.  This patch adds the *map_page and *map_sg variants of the
DMA mapping ops.

This patch is currently of interest mainly to some drivers that haven't
been submitted upstream yet.

Signed-off-by: Jonas Bonn <jonas@southpole.se>
This commit is contained in:
Jonas Bonn 2011-09-05 13:47:10 +02:00
parent d7cb666709
commit 707b38a00b
2 changed files with 84 additions and 3 deletions
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59
arch/openrisc/include/asm/dma-mapping.h
View File

@ -31,7 +31,6 @@
#define DMA_ERROR_CODE (~(dma_addr_t)0x0)
int dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
#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)
@ -47,6 +46,12 @@ dma_addr_t or1k_map_page(struct device *dev, struct page *page,
void or1k_unmap_page(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs);
int or1k_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
struct dma_attrs *attrs);
void or1k_unmap_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
struct dma_attrs *attrs);
void or1k_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir);
@ -98,6 +103,51 @@ static inline void dma_unmap_single(struct device *dev, dma_addr_t addr,
debug_dma_unmap_page(dev, addr, size, dir, true);
}
static inline int dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir)
{
int i, ents;
struct scatterlist *s;
for_each_sg(sg, s, nents, i)
kmemcheck_mark_initialized(sg_virt(s), s->length);
BUG_ON(!valid_dma_direction(dir));
ents = or1k_map_sg(dev, sg, nents, dir, NULL);
debug_dma_map_sg(dev, sg, nents, ents, dir);
return ents;
}
static inline void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir)
{
BUG_ON(!valid_dma_direction(dir));
debug_dma_unmap_sg(dev, sg, nents, dir);
or1k_unmap_sg(dev, sg, nents, dir, NULL);
}
static inline dma_addr_t dma_map_page(struct device *dev, struct page *page,
size_t offset, size_t size,
enum dma_data_direction dir)
{
dma_addr_t addr;
kmemcheck_mark_initialized(page_address(page) + offset, size);
BUG_ON(!valid_dma_direction(dir));
addr = or1k_map_page(dev, page, offset, size, dir, NULL);
debug_dma_map_page(dev, page, offset, size, dir, addr, false);
return addr;
}
static inline void dma_unmap_page(struct device *dev, dma_addr_t addr,
size_t size, enum dma_data_direction dir)
{
BUG_ON(!valid_dma_direction(dir));
or1k_unmap_page(dev, addr, size, dir, NULL);
debug_dma_unmap_page(dev, addr, size, dir, true);
}
static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
size_t size,
enum dma_data_direction dir)
@ -119,7 +169,12 @@ static inline void dma_sync_single_for_device(struct device *dev,
static inline int dma_supported(struct device *dev, u64 dma_mask)
{
/* Support 32 bit DMA mask exclusively */
return dma_mask == 0xffffffffULL;
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)

28
arch/openrisc/kernel/dma.c
View File

@ -154,6 +154,33 @@ void or1k_unmap_page(struct device *dev, dma_addr_t dma_handle,
/* Nothing special to do here... */
}
int or1k_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
struct scatterlist *s;
int i;
for_each_sg(sg, s, nents, i) {
s->dma_address = or1k_map_page(dev, sg_page(s), s->offset,
s->length, dir, NULL);
}
return nents;
}
void or1k_unmap_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
struct scatterlist *s;
int i;
for_each_sg(sg, s, nents, i) {
or1k_unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, NULL);
}
}
void or1k_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir)
@ -187,5 +214,4 @@ static int __init dma_init(void)
return 0;
}
fs_initcall(dma_init);