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authorBarry Song <barry.song@analog.com>2009-11-23 03:47:24 +0000
committerMike Frysinger <vapier@gentoo.org>2009-12-15 00:16:01 -0500
commitdd3b0e3e6a322184313e47e2fd5955ab113ad463 (patch)
tree224a3f1eae739b66ecfb65bc44dc7d9a482a0df3 /arch/blackfin
parenta00b4fe5ce4b98f7c4457fffdb392d7bfece2e78 (diff)
Blackfin: dma-mapping.h: flesh out missing DMA mapping functions
Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/include/asm/dma-mapping.h121
-rw-r--r--arch/blackfin/include/asm/dma.h5
-rw-r--r--arch/blackfin/kernel/dma-mapping.c54
3 files changed, 116 insertions, 64 deletions
diff --git a/arch/blackfin/include/asm/dma-mapping.h b/arch/blackfin/include/asm/dma-mapping.h
index 7a23d824ac96..f9172ff30e5c 100644
--- a/arch/blackfin/include/asm/dma-mapping.h
+++ b/arch/blackfin/include/asm/dma-mapping.h
@@ -7,9 +7,9 @@
#ifndef _BLACKFIN_DMA_MAPPING_H
#define _BLACKFIN_DMA_MAPPING_H
-#include <asm/scatterlist.h>
+#include <asm/cacheflush.h>
+struct scatterlist;
-void dma_alloc_init(unsigned long start, unsigned long end);
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 *vaddr,
@@ -20,13 +20,51 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
*/
#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)
+#define dma_supported(d, m) (1)
+#define dma_get_cache_alignment() (32)
+#define dma_is_consistent(d, h) (1)
-static inline
-int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+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;
}
+static inline int
+dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+ return 0;
+}
+
+extern void
+__dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
+static inline void
+_dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
+{
+ if (!__builtin_constant_p(dir)) {
+ __dma_sync(addr, size, dir);
+ return;
+ }
+
+ switch (dir) {
+ case DMA_NONE:
+ BUG();
+ case DMA_TO_DEVICE: /* writeback only */
+ flush_dcache_range(addr, addr + size);
+ break;
+ case DMA_FROM_DEVICE: /* invalidate only */
+ case DMA_BIDIRECTIONAL: /* flush and invalidate */
+ /* Blackfin has no dedicated invalidate (it includes a flush) */
+ invalidate_dcache_range(addr, addr + size);
+ break;
+ }
+}
+
/*
* Map a single buffer of the indicated size for DMA in streaming mode.
* The 32-bit bus address to use is returned.
@@ -34,8 +72,13 @@ int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
* Once the device is given the dma address, the device owns this memory
* until either pci_unmap_single or pci_dma_sync_single is performed.
*/
-extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
- enum dma_data_direction direction);
+static inline dma_addr_t
+dma_map_single(struct device *dev, void *ptr, size_t size,
+ enum dma_data_direction dir)
+{
+ _dma_sync((dma_addr_t)ptr, size, dir);
+ return (dma_addr_t) ptr;
+}
static inline dma_addr_t
dma_map_page(struct device *dev, struct page *page,
@@ -53,8 +96,12 @@ dma_map_page(struct device *dev, struct page *page,
* After this call, reads by the cpu to the buffer are guarenteed to see
* whatever the device wrote there.
*/
-extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
- enum dma_data_direction direction);
+static inline void
+dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
+ enum dma_data_direction dir)
+{
+ BUG_ON(!valid_dma_direction(dir));
+}
static inline void
dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
@@ -80,38 +127,66 @@ dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
* the same here.
*/
extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction direction);
+ enum dma_data_direction dir);
/*
* Unmap a set of streaming mode DMA translations.
* Again, cpu read rules concerning calls here are the same as for
* pci_unmap_single() above.
*/
-extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
- int nhwentries, enum dma_data_direction direction);
+static inline void
+dma_unmap_sg(struct device *dev, struct scatterlist *sg,
+ int nhwentries, enum dma_data_direction dir)
+{
+ BUG_ON(!valid_dma_direction(dir));
+}
-static inline void dma_sync_single_for_cpu(struct device *dev,
- dma_addr_t handle, size_t size,
- enum dma_data_direction dir)
+static inline void
+dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir)
{
+ BUG_ON(!valid_dma_direction(dir));
}
-static inline void dma_sync_single_for_device(struct device *dev,
- dma_addr_t handle, size_t size,
- enum dma_data_direction dir)
+static inline void
+dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir)
{
+ _dma_sync(handle + offset, size, dir);
}
-static inline void dma_sync_sg_for_cpu(struct device *dev,
- struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
+static inline void
+dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
+ enum dma_data_direction dir)
{
+ dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
}
-static inline void dma_sync_sg_for_device(struct device *dev,
- struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
+static inline void
+dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
+ enum dma_data_direction dir)
+{
+ dma_sync_single_range_for_device(dev, handle, 0, size, dir);
+}
+
+static inline void
+dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
+ enum dma_data_direction dir)
+{
+ BUG_ON(!valid_dma_direction(dir));
+}
+
+extern void
+dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+ int nents, enum dma_data_direction dir);
+
+static inline void
+dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+ enum dma_data_direction dir)
{
+ _dma_sync((dma_addr_t)vaddr, size, dir);
}
#endif /* _BLACKFIN_DMA_MAPPING_H */
diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h
index 5eb29502bbe4..bd2e62243abe 100644
--- a/arch/blackfin/include/asm/dma.h
+++ b/arch/blackfin/include/asm/dma.h
@@ -13,8 +13,7 @@
#include <asm/atomic.h>
#include <asm/blackfin.h>
#include <asm/page.h>
-
-#define MAX_DMA_ADDRESS PAGE_OFFSET
+#include <asm-generic/dma.h>
/* DMA_CONFIG Masks */
#define DMAEN 0x0001 /* DMA Channel Enable */
@@ -257,8 +256,6 @@ static inline void enable_dma(unsigned int channel)
dma_ch[channel].regs->curr_y_count = 0;
dma_ch[channel].regs->cfg |= DMAEN;
}
-void free_dma(unsigned int channel);
-int request_dma(unsigned int channel, const char *device_id);
int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data);
static inline void dma_disable_irq(unsigned int channel)
diff --git a/arch/blackfin/kernel/dma-mapping.c b/arch/blackfin/kernel/dma-mapping.c
index 755a0f4b61ae..e937f323d82c 100644
--- a/arch/blackfin/kernel/dma-mapping.c
+++ b/arch/blackfin/kernel/dma-mapping.c
@@ -7,17 +7,11 @@
*/
#include <linux/types.h>
-#include <linux/mm.h>
+#include <linux/gfp.h>
#include <linux/string.h>
-#include <linux/bootmem.h>
#include <linux/spinlock.h>
-#include <linux/device.h>
#include <linux/dma-mapping.h>
-#include <linux/io.h>
#include <linux/scatterlist.h>
-#include <asm/cacheflush.h>
-#include <asm/bfin-global.h>
-#include <asm/sections.h>
static spinlock_t dma_page_lock;
static unsigned long *dma_page;
@@ -26,7 +20,7 @@ static unsigned long dma_base;
static unsigned long dma_size;
static unsigned int dma_initialized;
-void dma_alloc_init(unsigned long start, unsigned long end)
+static void dma_alloc_init(unsigned long start, unsigned long end)
{
spin_lock_init(&dma_page_lock);
dma_initialized = 0;
@@ -93,7 +87,7 @@ static void __free_dma_pages(unsigned long addr, unsigned int pages)
}
void *dma_alloc_coherent(struct device *dev, size_t size,
- dma_addr_t * dma_handle, gfp_t gfp)
+ dma_addr_t *dma_handle, gfp_t gfp)
{
void *ret;
@@ -117,21 +111,14 @@ dma_free_coherent(struct device *dev, size_t size, void *vaddr,
EXPORT_SYMBOL(dma_free_coherent);
/*
- * Dummy functions defined for some existing drivers
+ * Streaming DMA mappings
*/
-
-dma_addr_t
-dma_map_single(struct device *dev, void *ptr, size_t size,
- enum dma_data_direction direction)
+void __dma_sync(dma_addr_t addr, size_t size,
+ enum dma_data_direction dir)
{
- BUG_ON(direction == DMA_NONE);
-
- invalidate_dcache_range((unsigned long)ptr,
- (unsigned long)ptr + size);
-
- return (dma_addr_t) ptr;
+ _dma_sync(addr, size, dir);
}
-EXPORT_SYMBOL(dma_map_single);
+EXPORT_SYMBOL(__dma_sync);
int
dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
@@ -139,30 +126,23 @@ dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
{
int i;
- BUG_ON(direction == DMA_NONE);
-
for (i = 0; i < nents; i++, sg++) {
sg->dma_address = (dma_addr_t) sg_virt(sg);
-
- invalidate_dcache_range(sg_dma_address(sg),
- sg_dma_address(sg) +
- sg_dma_len(sg));
+ __dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
}
return nents;
}
EXPORT_SYMBOL(dma_map_sg);
-void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
- enum dma_data_direction direction)
+void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
+ int nelems, enum dma_data_direction direction)
{
- BUG_ON(direction == DMA_NONE);
-}
-EXPORT_SYMBOL(dma_unmap_single);
+ int i;
-void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
- int nhwentries, enum dma_data_direction direction)
-{
- BUG_ON(direction == DMA_NONE);
+ for (i = 0; i < nelems; i++, sg++) {
+ sg->dma_address = (dma_addr_t) sg_virt(sg);
+ __dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
+ }
}
-EXPORT_SYMBOL(dma_unmap_sg);
+EXPORT_SYMBOL(dma_sync_sg_for_device);