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>
This commit is contained in:
Barry Song
Mike Frysinger
Родитель
a00b4fe5ce
Коммит
dd3b0e3e6a
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@ -7,9 +7,9 @@
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#ifndef _BLACKFIN_DMA_MAPPING_H
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#define _BLACKFIN_DMA_MAPPING_H
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#include <asm/scatterlist.h>
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#include <asm/cacheflush.h>
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struct scatterlist;
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void dma_alloc_init(unsigned long start, unsigned long end);
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void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t gfp);
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void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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@ -20,13 +20,51 @@ void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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*/
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#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
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#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
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#define dma_supported(d, m) (1)
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#define dma_get_cache_alignment() (32)
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#define dma_is_consistent(d, h) (1)
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static inline
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int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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static inline int
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dma_set_mask(struct device *dev, u64 dma_mask)
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{
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if (!dev->dma_mask || !dma_supported(dev, dma_mask))
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return -EIO;
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*dev->dma_mask = dma_mask;
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return 0;
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}
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static inline int
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dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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{
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return 0;
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}
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extern void
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__dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir);
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static inline void
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_dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
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{
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if (!__builtin_constant_p(dir)) {
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__dma_sync(addr, size, dir);
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return;
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}
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switch (dir) {
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case DMA_NONE:
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BUG();
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case DMA_TO_DEVICE: /* writeback only */
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flush_dcache_range(addr, addr + size);
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break;
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case DMA_FROM_DEVICE: /* invalidate only */
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case DMA_BIDIRECTIONAL: /* flush and invalidate */
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/* Blackfin has no dedicated invalidate (it includes a flush) */
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invalidate_dcache_range(addr, addr + size);
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break;
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}
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}
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/*
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* Map a single buffer of the indicated size for DMA in streaming mode.
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* The 32-bit bus address to use is returned.
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@ -34,8 +72,13 @@ int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
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* Once the device is given the dma address, the device owns this memory
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* until either pci_unmap_single or pci_dma_sync_single is performed.
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*/
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extern dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction direction);
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static inline dma_addr_t
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dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction dir)
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{
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_dma_sync((dma_addr_t)ptr, size, dir);
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return (dma_addr_t) ptr;
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}
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static inline dma_addr_t
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dma_map_page(struct device *dev, struct page *page,
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@ -53,8 +96,12 @@ dma_map_page(struct device *dev, struct page *page,
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* After this call, reads by the cpu to the buffer are guarenteed to see
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* whatever the device wrote there.
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*/
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extern void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction direction);
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static inline void
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dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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}
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static inline void
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dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
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@ -80,38 +127,66 @@ dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
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* the same here.
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*/
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extern int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction);
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enum dma_data_direction dir);
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/*
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* Unmap a set of streaming mode DMA translations.
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* Again, cpu read rules concerning calls here are the same as for
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* pci_unmap_single() above.
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*/
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extern void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
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int nhwentries, enum dma_data_direction direction);
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static inline void
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dma_unmap_sg(struct device *dev, struct scatterlist *sg,
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int nhwentries, enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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}
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static inline void dma_sync_single_for_cpu(struct device *dev,
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dma_addr_t handle, size_t size,
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static inline void
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dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t handle,
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unsigned long offset, size_t size,
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enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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}
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static inline void dma_sync_single_for_device(struct device *dev,
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dma_addr_t handle, size_t size,
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static inline void
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dma_sync_single_range_for_device(struct device *dev, dma_addr_t handle,
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unsigned long offset, size_t size,
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enum dma_data_direction dir)
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{
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_dma_sync(handle + offset, size, dir);
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}
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static inline void dma_sync_sg_for_cpu(struct device *dev,
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struct scatterlist *sg,
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int nents, enum dma_data_direction dir)
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static inline void
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dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, size_t size,
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enum dma_data_direction dir)
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{
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dma_sync_single_range_for_cpu(dev, handle, 0, size, dir);
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}
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static inline void dma_sync_sg_for_device(struct device *dev,
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struct scatterlist *sg,
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int nents, enum dma_data_direction dir)
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static inline void
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dma_sync_single_for_device(struct device *dev, dma_addr_t handle, size_t size,
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enum dma_data_direction dir)
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{
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dma_sync_single_range_for_device(dev, handle, 0, size, dir);
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}
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static inline void
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dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction dir)
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{
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BUG_ON(!valid_dma_direction(dir));
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}
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extern void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
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int nents, enum dma_data_direction dir);
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static inline void
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dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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enum dma_data_direction dir)
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{
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_dma_sync((dma_addr_t)vaddr, size, dir);
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}
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#endif /* _BLACKFIN_DMA_MAPPING_H */
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@ -13,8 +13,7 @@
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#include <asm/atomic.h>
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#include <asm/blackfin.h>
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#include <asm/page.h>
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#define MAX_DMA_ADDRESS PAGE_OFFSET
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#include <asm-generic/dma.h>
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/* DMA_CONFIG Masks */
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#define DMAEN 0x0001 /* DMA Channel Enable */
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@ -257,8 +256,6 @@ static inline void enable_dma(unsigned int channel)
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dma_ch[channel].regs->curr_y_count = 0;
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dma_ch[channel].regs->cfg |= DMAEN;
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}
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void free_dma(unsigned int channel);
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int request_dma(unsigned int channel, const char *device_id);
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int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data);
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static inline void dma_disable_irq(unsigned int channel)
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@ -7,17 +7,11 @@
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/gfp.h>
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#include <linux/string.h>
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#include <linux/bootmem.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/scatterlist.h>
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#include <asm/cacheflush.h>
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#include <asm/bfin-global.h>
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#include <asm/sections.h>
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static spinlock_t dma_page_lock;
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static unsigned long *dma_page;
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@ -26,7 +20,7 @@ static unsigned long dma_base;
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static unsigned long dma_size;
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static unsigned int dma_initialized;
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void dma_alloc_init(unsigned long start, unsigned long end)
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static void dma_alloc_init(unsigned long start, unsigned long end)
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{
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spin_lock_init(&dma_page_lock);
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dma_initialized = 0;
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@ -93,7 +87,7 @@ static void __free_dma_pages(unsigned long addr, unsigned int pages)
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}
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void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t * dma_handle, gfp_t gfp)
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dma_addr_t *dma_handle, gfp_t gfp)
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{
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void *ret;
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@ -117,21 +111,14 @@ dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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EXPORT_SYMBOL(dma_free_coherent);
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/*
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* Dummy functions defined for some existing drivers
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* Streaming DMA mappings
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*/
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dma_addr_t
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dma_map_single(struct device *dev, void *ptr, size_t size,
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enum dma_data_direction direction)
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void __dma_sync(dma_addr_t addr, size_t size,
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enum dma_data_direction dir)
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{
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BUG_ON(direction == DMA_NONE);
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invalidate_dcache_range((unsigned long)ptr,
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(unsigned long)ptr + size);
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return (dma_addr_t) ptr;
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_dma_sync(addr, size, dir);
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}
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EXPORT_SYMBOL(dma_map_single);
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EXPORT_SYMBOL(__dma_sync);
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int
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dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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@ -139,30 +126,23 @@ dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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{
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int i;
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BUG_ON(direction == DMA_NONE);
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for (i = 0; i < nents; i++, sg++) {
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sg->dma_address = (dma_addr_t) sg_virt(sg);
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invalidate_dcache_range(sg_dma_address(sg),
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sg_dma_address(sg) +
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sg_dma_len(sg));
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__dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
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}
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return nents;
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}
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EXPORT_SYMBOL(dma_map_sg);
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void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
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enum dma_data_direction direction)
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void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
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int nelems, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_unmap_single);
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int i;
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void dma_unmap_sg(struct device *dev, struct scatterlist *sg,
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int nhwentries, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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for (i = 0; i < nelems; i++, sg++) {
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sg->dma_address = (dma_addr_t) sg_virt(sg);
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__dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction);
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}
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}
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EXPORT_SYMBOL(dma_unmap_sg);
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EXPORT_SYMBOL(dma_sync_sg_for_device);
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