5d33eebee8
Use BUG_ON rather than BUG to simplify the dma_ops handing, and remove the now-unnecessary return cases. Booted on pseries. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
/*
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* Copyright (C) 2004 IBM Corporation
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*
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* Implements the generic device dma API for ppc64. Handles
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* the pci and vio busses
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*/
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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/* Include the busses we support */
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#include <linux/pci.h>
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#include <asm/vio.h>
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#include <asm/ibmebus.h>
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#include <asm/scatterlist.h>
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#include <asm/bug.h>
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static struct dma_mapping_ops *get_dma_ops(struct device *dev)
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{
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#ifdef CONFIG_PCI
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if (dev->bus == &pci_bus_type)
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return &pci_dma_ops;
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#endif
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#ifdef CONFIG_IBMVIO
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if (dev->bus == &vio_bus_type)
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return &vio_dma_ops;
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#endif
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#ifdef CONFIG_IBMEBUS
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if (dev->bus == &ibmebus_bus_type)
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return &ibmebus_dma_ops;
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#endif
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return NULL;
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}
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int dma_supported(struct device *dev, u64 mask)
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{
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struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
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BUG_ON(!dma_ops);
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return dma_ops->dma_supported(dev, mask);
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}
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EXPORT_SYMBOL(dma_supported);
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int dma_set_mask(struct device *dev, u64 dma_mask)
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{
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#ifdef CONFIG_PCI
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if (dev->bus == &pci_bus_type)
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return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
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#endif
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#ifdef CONFIG_IBMVIO
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if (dev->bus == &vio_bus_type)
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return -EIO;
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#endif /* CONFIG_IBMVIO */
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#ifdef CONFIG_IBMEBUS
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if (dev->bus == &ibmebus_bus_type)
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return -EIO;
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#endif
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BUG();
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return 0;
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}
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EXPORT_SYMBOL(dma_set_mask);
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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 flag)
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{
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struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
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BUG_ON(!dma_ops);
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return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
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}
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EXPORT_SYMBOL(dma_alloc_coherent);
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void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
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dma_addr_t dma_handle)
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{
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struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
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BUG_ON(!dma_ops);
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dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
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}
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EXPORT_SYMBOL(dma_free_coherent);
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dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, size_t size,
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enum dma_data_direction direction)
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{
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struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
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BUG_ON(!dma_ops);
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return dma_ops->map_single(dev, cpu_addr, size, direction);
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}
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EXPORT_SYMBOL(dma_map_single);
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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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struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
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BUG_ON(!dma_ops);
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dma_ops->unmap_single(dev, dma_addr, size, direction);
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}
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EXPORT_SYMBOL(dma_unmap_single);
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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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struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
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BUG_ON(!dma_ops);
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return dma_ops->map_single(dev, page_address(page) + offset, size,
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direction);
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}
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EXPORT_SYMBOL(dma_map_page);
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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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struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
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BUG_ON(!dma_ops);
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dma_ops->unmap_single(dev, dma_address, size, direction);
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}
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EXPORT_SYMBOL(dma_unmap_page);
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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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{
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struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
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BUG_ON(!dma_ops);
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return dma_ops->map_sg(dev, sg, nents, direction);
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}
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EXPORT_SYMBOL(dma_map_sg);
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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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struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
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BUG_ON(!dma_ops);
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dma_ops->unmap_sg(dev, sg, nhwentries, direction);
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}
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EXPORT_SYMBOL(dma_unmap_sg);
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