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Diffstat (limited to 'arch/mips/mm/dma-coherent.c')
| -rw-r--r-- | arch/mips/mm/dma-coherent.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/arch/mips/mm/dma-coherent.c b/arch/mips/mm/dma-coherent.c new file mode 100644 index 0000000..97a50d3 --- /dev/null +++ b/arch/mips/mm/dma-coherent.c @@ -0,0 +1,255 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com> + * Copyright (C) 2000, 2001 Ralf Baechle <ralf@gnu.org> + * swiped from i386, and cloned for MIPS by Geert, polished by Ralf. + */ +#include <linux/config.h> +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/pci.h> + +#include <asm/cache.h> +#include <asm/io.h> + +void *dma_alloc_noncoherent(struct device *dev, size_t size, + dma_addr_t * dma_handle, int gfp) +{ + void *ret; + /* ignore region specifiers */ + gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); + + if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff)) + gfp |= GFP_DMA; + ret = (void *) __get_free_pages(gfp, get_order(size)); + + if (ret != NULL) { + memset(ret, 0, size); + *dma_handle = virt_to_phys(ret); + } + + return ret; +} + +EXPORT_SYMBOL(dma_alloc_noncoherent); + +void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t * dma_handle, int gfp) + __attribute__((alias("dma_alloc_noncoherent"))); + +EXPORT_SYMBOL(dma_alloc_coherent); + +void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle) +{ + unsigned long addr = (unsigned long) vaddr; + + free_pages(addr, get_order(size)); +} + +EXPORT_SYMBOL(dma_free_noncoherent); + +void dma_free_coherent(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle) __attribute__((alias("dma_free_noncoherent"))); + +EXPORT_SYMBOL(dma_free_coherent); + +dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, + enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); + + return __pa(ptr); +} + +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) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_unmap_single); + +int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, + enum dma_data_direction direction) +{ + int i; + + BUG_ON(direction == DMA_NONE); + + for (i = 0; i < nents; i++, sg++) { + sg->dma_address = (dma_addr_t)page_to_phys(sg->page) + sg->offset; + } + + return nents; +} + +EXPORT_SYMBOL(dma_map_sg); + +dma_addr_t dma_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); + + return page_to_phys(page) + offset; +} + +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) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_unmap_page); + +void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, + enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_unmap_sg); + +void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_sync_single_for_cpu); + +void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_sync_single_for_device); + +void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle, + unsigned long offset, size_t size, + enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_sync_single_range_for_cpu); + +void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle, + unsigned long offset, size_t size, + enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_sync_single_range_for_device); + +void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, + enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_sync_sg_for_cpu); + +void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems, + enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_sync_sg_for_device); + +int dma_mapping_error(dma_addr_t dma_addr) +{ + return 0; +} + +EXPORT_SYMBOL(dma_mapping_error); + +int dma_supported(struct device *dev, u64 mask) +{ + /* + * we fall back to GFP_DMA when the mask isn't all 1s, + * so we can't guarantee allocations that must be + * within a tighter range than GFP_DMA.. + */ + if (mask < 0x00ffffff) + return 0; + + return 1; +} + +EXPORT_SYMBOL(dma_supported); + +int dma_is_consistent(dma_addr_t dma_addr) +{ + return 1; +} + +EXPORT_SYMBOL(dma_is_consistent); + +void dma_cache_sync(void *vaddr, size_t size, + enum dma_data_direction direction) +{ + BUG_ON(direction == DMA_NONE); +} + +EXPORT_SYMBOL(dma_cache_sync); + +/* The DAC routines are a PCIism.. */ + +#ifdef CONFIG_PCI + +#include <linux/pci.h> + +dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev, + struct page *page, unsigned long offset, int direction) +{ + return (dma64_addr_t)page_to_phys(page) + offset; +} + +EXPORT_SYMBOL(pci_dac_page_to_dma); + +struct page *pci_dac_dma_to_page(struct pci_dev *pdev, + dma64_addr_t dma_addr) +{ + return mem_map + (dma_addr >> PAGE_SHIFT); +} + +EXPORT_SYMBOL(pci_dac_dma_to_page); + +unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev, + dma64_addr_t dma_addr) +{ + return dma_addr & ~PAGE_MASK; +} + +EXPORT_SYMBOL(pci_dac_dma_to_offset); + +void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, + dma64_addr_t dma_addr, size_t len, int direction) +{ + BUG_ON(direction == PCI_DMA_NONE); +} + +EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu); + +void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, + dma64_addr_t dma_addr, size_t len, int direction) +{ + BUG_ON(direction == PCI_DMA_NONE); +} + +EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device); + +#endif /* CONFIG_PCI */ |
