235 lines
6.4 KiB
C
235 lines
6.4 KiB
C
/* DMA mapping routines for the MN10300 arch
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_DMA_MAPPING_H
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#define _ASM_DMA_MAPPING_H
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <asm/cache.h>
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#include <asm/io.h>
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extern void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, int flag);
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extern void dma_free_coherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle);
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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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/*
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* Map a single buffer of the indicated size for DMA in streaming mode. The
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* 32-bit bus address to use is returned.
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*
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* Once the device is given the dma address, the device owns this memory until
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* either pci_unmap_single or pci_dma_sync_single is performed.
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*/
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static inline
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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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{
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BUG_ON(direction == DMA_NONE);
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mn10300_dcache_flush_inv();
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return virt_to_bus(ptr);
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}
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/*
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* Unmap a single streaming mode DMA translation. The dma_addr and size must
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* match what was provided for in a previous pci_map_single call. All other
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* usages are undefined.
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*
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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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static inline
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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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{
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BUG_ON(direction == DMA_NONE);
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}
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/*
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* Map a set of buffers described by scatterlist in streaming mode for DMA.
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* This is the scather-gather version of the above pci_map_single interface.
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* Here the scatter gather list elements are each tagged with the appropriate
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* dma address and length. They are obtained via sg_dma_{address,length}(SG).
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*
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* NOTE: An implementation may be able to use a smaller number of DMA
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* address/length pairs than there are SG table elements. (for example
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* via virtual mapping capabilities) The routine returns the number of
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* addr/length pairs actually used, at most nents.
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*
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* Device ownership issues as mentioned above for pci_map_single are the same
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* here.
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*/
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static inline
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int dma_map_sg(struct device *dev, struct scatterlist *sglist, int nents,
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enum dma_data_direction direction)
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{
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struct scatterlist *sg;
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int i;
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BUG_ON(!valid_dma_direction(direction));
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WARN_ON(nents == 0 || sglist[0].length == 0);
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for_each_sg(sglist, sg, nents, i) {
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BUG_ON(!sg_page(sg));
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sg->dma_address = sg_phys(sg);
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}
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mn10300_dcache_flush_inv();
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return nents;
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}
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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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static inline
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void 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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BUG_ON(!valid_dma_direction(direction));
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}
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/*
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* pci_{map,unmap}_single_page maps a kernel page to a dma_addr_t. identical
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* to pci_map_single, but takes a struct page instead of a virtual address
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*/
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static inline
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dma_addr_t dma_map_page(struct device *dev, struct page *page,
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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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BUG_ON(direction == DMA_NONE);
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return page_to_bus(page) + offset;
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}
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static inline
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void 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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BUG_ON(direction == DMA_NONE);
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}
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/*
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* Make physical memory consistent for a single streaming mode DMA translation
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* after a transfer.
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*
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* If you perform a pci_map_single() but wish to interrogate the buffer using
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* the cpu, yet do not wish to teardown the PCI dma mapping, you must call this
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* function before doing so. At the next point you give the PCI dma address
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* back to the card, the device again owns the buffer.
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*/
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static inline
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void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction)
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{
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}
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static inline
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void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
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size_t size, enum dma_data_direction direction)
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{
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mn10300_dcache_flush_inv();
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}
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static inline
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void 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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}
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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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mn10300_dcache_flush_inv();
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}
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/*
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* Make physical memory consistent for a set of streaming mode DMA translations
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* after a transfer.
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*
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* The same as pci_dma_sync_single but for a scatter-gather list, same rules
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* and usage.
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*/
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static inline
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void dma_sync_sg_for_cpu(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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}
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static inline
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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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mn10300_dcache_flush_inv();
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}
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static inline
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int dma_mapping_error(dma_addr_t dma_addr)
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{
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return 0;
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}
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/*
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* Return whether the given PCI device DMA address mask can be supported
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* properly. For example, if your device can only drive the low 24-bits during
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* PCI bus mastering, then you would pass 0x00ffffff as the mask to this
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* function.
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*/
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static inline
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int dma_supported(struct device *dev, u64 mask)
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{
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/*
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* we fall back to GFP_DMA when the mask isn't all 1s, so we can't
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* guarantee allocations that must be within a tighter range than
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* GFP_DMA
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*/
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if (mask < 0x00ffffff)
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return 0;
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return 1;
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}
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static inline
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int 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
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int dma_get_cache_alignment(void)
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{
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return 1 << L1_CACHE_SHIFT;
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}
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#define dma_is_consistent(d) (1)
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static inline
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void 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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mn10300_dcache_flush_inv();
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}
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#endif
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