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https://github.com/torvalds/linux
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253 lines
8 KiB
C
253 lines
8 KiB
C
#ifndef _PARISC_DMA_MAPPING_H
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#define _PARISC_DMA_MAPPING_H
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#include <linux/mm.h>
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#include <asm/cacheflush.h>
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#include <asm/scatterlist.h>
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/* See Documentation/DMA-mapping.txt */
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struct hppa_dma_ops {
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int (*dma_supported)(struct device *dev, u64 mask);
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void *(*alloc_consistent)(struct device *dev, size_t size, dma_addr_t *iova, gfp_t flag);
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void *(*alloc_noncoherent)(struct device *dev, size_t size, dma_addr_t *iova, gfp_t flag);
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void (*free_consistent)(struct device *dev, size_t size, void *vaddr, dma_addr_t iova);
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dma_addr_t (*map_single)(struct device *dev, void *addr, size_t size, enum dma_data_direction direction);
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void (*unmap_single)(struct device *dev, dma_addr_t iova, size_t size, enum dma_data_direction direction);
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int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction);
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void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nhwents, enum dma_data_direction direction);
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void (*dma_sync_single_for_cpu)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
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void (*dma_sync_single_for_device)(struct device *dev, dma_addr_t iova, unsigned long offset, size_t size, enum dma_data_direction direction);
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void (*dma_sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
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void (*dma_sync_sg_for_device)(struct device *dev, struct scatterlist *sg, int nelems, enum dma_data_direction direction);
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};
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/*
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** We could live without the hppa_dma_ops indirection if we didn't want
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** to support 4 different coherent dma models with one binary (they will
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** someday be loadable modules):
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** I/O MMU consistent method dma_sync behavior
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** ============= ====================== =======================
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** a) PA-7x00LC uncachable host memory flush/purge
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** b) U2/Uturn cachable host memory NOP
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** c) Ike/Astro cachable host memory NOP
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** d) EPIC/SAGA memory on EPIC/SAGA flush/reset DMA channel
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**
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** PA-7[13]00LC processors have a GSC bus interface and no I/O MMU.
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**
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** Systems (eg PCX-T workstations) that don't fall into the above
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** categories will need to modify the needed drivers to perform
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** flush/purge and allocate "regular" cacheable pages for everything.
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*/
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#ifdef CONFIG_PA11
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extern struct hppa_dma_ops pcxl_dma_ops;
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extern struct hppa_dma_ops pcx_dma_ops;
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#endif
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extern struct hppa_dma_ops *hppa_dma_ops;
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static inline void *
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dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t flag)
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{
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return hppa_dma_ops->alloc_consistent(dev, size, dma_handle, flag);
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}
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static inline void *
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dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
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gfp_t flag)
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{
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return hppa_dma_ops->alloc_noncoherent(dev, size, dma_handle, flag);
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}
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static inline void
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dma_free_coherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle)
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{
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hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
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}
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static inline void
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dma_free_noncoherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle)
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{
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hppa_dma_ops->free_consistent(dev, size, vaddr, dma_handle);
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}
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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 direction)
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{
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return hppa_dma_ops->map_single(dev, ptr, size, direction);
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}
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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 direction)
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{
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hppa_dma_ops->unmap_single(dev, dma_addr, size, direction);
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}
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static inline int
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dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
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enum dma_data_direction direction)
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{
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return hppa_dma_ops->map_sg(dev, sg, nents, direction);
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}
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static inline void
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dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
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enum dma_data_direction direction)
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{
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hppa_dma_ops->unmap_sg(dev, sg, nhwentries, direction);
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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, unsigned long offset,
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size_t size, enum dma_data_direction direction)
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{
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return dma_map_single(dev, (page_address(page) + (offset)), size, direction);
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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_address, size_t size,
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enum dma_data_direction direction)
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{
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dma_unmap_single(dev, dma_address, size, direction);
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}
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static inline void
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dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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if(hppa_dma_ops->dma_sync_single_for_cpu)
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hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, 0, size, direction);
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}
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static inline void
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dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
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enum dma_data_direction direction)
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{
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if(hppa_dma_ops->dma_sync_single_for_device)
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hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, 0, size, direction);
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}
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static inline void
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dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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if(hppa_dma_ops->dma_sync_single_for_cpu)
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hppa_dma_ops->dma_sync_single_for_cpu(dev, dma_handle, offset, size, direction);
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}
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static inline void
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dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
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unsigned long offset, size_t size,
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enum dma_data_direction direction)
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{
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if(hppa_dma_ops->dma_sync_single_for_device)
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hppa_dma_ops->dma_sync_single_for_device(dev, dma_handle, offset, size, direction);
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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 nelems,
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enum dma_data_direction direction)
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{
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if(hppa_dma_ops->dma_sync_sg_for_cpu)
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hppa_dma_ops->dma_sync_sg_for_cpu(dev, sg, nelems, direction);
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}
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static inline void
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dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
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enum dma_data_direction direction)
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{
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if(hppa_dma_ops->dma_sync_sg_for_device)
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hppa_dma_ops->dma_sync_sg_for_device(dev, sg, nelems, direction);
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}
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static inline int
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dma_supported(struct device *dev, u64 mask)
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{
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return hppa_dma_ops->dma_supported(dev, mask);
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}
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static inline int
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dma_set_mask(struct device *dev, u64 mask)
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{
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if(!dev->dma_mask || !dma_supported(dev, mask))
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return -EIO;
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*dev->dma_mask = mask;
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return 0;
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}
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static inline int
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dma_get_cache_alignment(void)
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{
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return dcache_stride;
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}
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static inline int
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dma_is_consistent(dma_addr_t dma_addr)
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{
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return (hppa_dma_ops->dma_sync_single_for_cpu == NULL);
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}
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static inline void
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dma_cache_sync(void *vaddr, size_t size,
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enum dma_data_direction direction)
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{
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if(hppa_dma_ops->dma_sync_single_for_cpu)
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flush_kernel_dcache_range((unsigned long)vaddr, size);
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}
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static inline void *
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parisc_walk_tree(struct device *dev)
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{
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struct device *otherdev;
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if(likely(dev->platform_data != NULL))
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return dev->platform_data;
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/* OK, just traverse the bus to find it */
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for(otherdev = dev->parent; otherdev;
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otherdev = otherdev->parent) {
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if(otherdev->platform_data) {
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dev->platform_data = otherdev->platform_data;
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break;
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}
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}
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BUG_ON(!dev->platform_data);
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return dev->platform_data;
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}
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#define GET_IOC(dev) (HBA_DATA(parisc_walk_tree(dev))->iommu);
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#ifdef CONFIG_IOMMU_CCIO
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struct parisc_device;
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struct ioc;
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void * ccio_get_iommu(const struct parisc_device *dev);
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int ccio_request_resource(const struct parisc_device *dev,
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struct resource *res);
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int ccio_allocate_resource(const struct parisc_device *dev,
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struct resource *res, unsigned long size,
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unsigned long min, unsigned long max, unsigned long align);
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#else /* !CONFIG_IOMMU_CCIO */
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#define ccio_get_iommu(dev) NULL
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#define ccio_request_resource(dev, res) request_resource(&iomem_resource, res)
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#define ccio_allocate_resource(dev, res, size, min, max, align) \
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allocate_resource(&iomem_resource, res, size, min, max, \
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align, NULL, NULL)
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#endif /* !CONFIG_IOMMU_CCIO */
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#ifdef CONFIG_IOMMU_SBA
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struct parisc_device;
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void * sba_get_iommu(struct parisc_device *dev);
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#endif
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/* At the moment, we panic on error for IOMMU resource exaustion */
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#define dma_mapping_error(x) 0
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#endif
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