/* * Copyright (C) 2004 IBM Corporation * * Implements the generic device dma API for ppc64. Handles * the pci and vio busses */ #include <linux/device.h> #include <linux/dma-mapping.h> /* Include the busses we support */ #include <linux/pci.h> #include <asm/vio.h> #include <asm/scatterlist.h> #include <asm/bug.h> static struct dma_mapping_ops *get_dma_ops(struct device *dev) { #ifdef CONFIG_PCI if (dev->bus == &pci_bus_type) return &pci_dma_ops; #endif #ifdef CONFIG_IBMVIO if (dev->bus == &vio_bus_type) return &vio_dma_ops; #endif return NULL; } int dma_supported(struct device *dev, u64 mask) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (dma_ops) return dma_ops->dma_supported(dev, mask); BUG(); return 0; } EXPORT_SYMBOL(dma_supported); int dma_set_mask(struct device *dev, u64 dma_mask) { #ifdef CONFIG_PCI if (dev->bus == &pci_bus_type) return pci_set_dma_mask(to_pci_dev(dev), dma_mask); #endif #ifdef CONFIG_IBMVIO if (dev->bus == &vio_bus_type) return -EIO; #endif /* CONFIG_IBMVIO */ BUG(); return 0; } EXPORT_SYMBOL(dma_set_mask); void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle, unsigned int __nocast flag) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (dma_ops) return dma_ops->alloc_coherent(dev, size, dma_handle, flag); BUG(); return NULL; } EXPORT_SYMBOL(dma_alloc_coherent); void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_handle) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (dma_ops) dma_ops->free_coherent(dev, size, cpu_addr, dma_handle); else BUG(); } EXPORT_SYMBOL(dma_free_coherent); dma_addr_t dma_map_single(struct device *dev, void *cpu_addr, size_t size, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (dma_ops) return dma_ops->map_single(dev, cpu_addr, size, direction); BUG(); return (dma_addr_t)0; } EXPORT_SYMBOL(dma_map_single); void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (dma_ops) dma_ops->unmap_single(dev, dma_addr, size, direction); else BUG(); } EXPORT_SYMBOL(dma_unmap_single); dma_addr_t dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (dma_ops) return dma_ops->map_single(dev, (page_address(page) + offset), size, direction); BUG(); return (dma_addr_t)0; } EXPORT_SYMBOL(dma_map_page); void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (dma_ops) dma_ops->unmap_single(dev, dma_address, size, direction); else BUG(); } EXPORT_SYMBOL(dma_unmap_page); int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (dma_ops) return dma_ops->map_sg(dev, sg, nents, direction); BUG(); return 0; } EXPORT_SYMBOL(dma_map_sg); void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, enum dma_data_direction direction) { struct dma_mapping_ops *dma_ops = get_dma_ops(dev); if (dma_ops) dma_ops->unmap_sg(dev, sg, nhwentries, direction); else BUG(); } EXPORT_SYMBOL(dma_unmap_sg);