forked from Minki/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
258 lines
6.0 KiB
C
258 lines
6.0 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
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* Copyright (C) 2000, 2001 Ralf Baechle <ralf@gnu.org>
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* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
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*/
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/pci.h>
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#include <asm/cache.h>
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#include <asm/pci/bridge.h>
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#define pdev_to_baddr(pdev, addr) \
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(BRIDGE_CONTROLLER(pdev->bus)->baddr + (addr))
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#define dev_to_baddr(dev, addr) \
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pdev_to_baddr(to_pci_dev(dev), (addr))
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void *dma_alloc_noncoherent(struct device *dev, size_t size,
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dma_addr_t * dma_handle, int gfp)
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{
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void *ret;
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/* ignore region specifiers */
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gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
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if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
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gfp |= GFP_DMA;
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ret = (void *) __get_free_pages(gfp, get_order(size));
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if (ret != NULL) {
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memset(ret, 0, size);
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*dma_handle = dev_to_baddr(dev, virt_to_phys(ret));
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}
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return ret;
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}
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EXPORT_SYMBOL(dma_alloc_noncoherent);
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void *dma_alloc_coherent(struct device *dev, size_t size,
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dma_addr_t * dma_handle, int gfp)
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__attribute__((alias("dma_alloc_noncoherent")));
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EXPORT_SYMBOL(dma_alloc_coherent);
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void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle)
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{
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unsigned long addr = (unsigned long) vaddr;
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free_pages(addr, get_order(size));
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}
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EXPORT_SYMBOL(dma_free_noncoherent);
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void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
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dma_addr_t dma_handle) __attribute__((alias("dma_free_noncoherent")));
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EXPORT_SYMBOL(dma_free_coherent);
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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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return dev_to_baddr(dev, __pa(ptr));
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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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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_unmap_single);
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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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int i;
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BUG_ON(direction == DMA_NONE);
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for (i = 0; i < nents; i++, sg++) {
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sg->dma_address = (dma_addr_t) dev_to_baddr(dev,
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page_to_phys(sg->page) + sg->offset);
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}
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return nents;
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}
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EXPORT_SYMBOL(dma_map_sg);
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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, enum dma_data_direction direction)
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{
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BUG_ON(direction == DMA_NONE);
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return dev_to_baddr(dev, page_to_phys(page) + offset);
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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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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_unmap_page);
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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(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_unmap_sg);
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void 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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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_sync_single_for_cpu);
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void 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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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_sync_single_for_device);
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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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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
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void 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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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_sync_single_range_for_device);
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void 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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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_sync_sg_for_cpu);
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void 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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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_sync_sg_for_device);
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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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EXPORT_SYMBOL(dma_mapping_error);
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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,
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* so we can't guarantee allocations that must be
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* within a tighter range than 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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EXPORT_SYMBOL(dma_supported);
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int dma_is_consistent(dma_addr_t dma_addr)
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{
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return 1;
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}
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EXPORT_SYMBOL(dma_is_consistent);
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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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BUG_ON(direction == DMA_NONE);
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}
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EXPORT_SYMBOL(dma_cache_sync);
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dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
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struct page *page, unsigned long offset, int direction)
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{
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dma64_addr_t addr = page_to_phys(page) + offset;
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return (dma64_addr_t) pdev_to_baddr(pdev, addr);
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}
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EXPORT_SYMBOL(pci_dac_page_to_dma);
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struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
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dma64_addr_t dma_addr)
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{
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struct bridge_controller *bc = BRIDGE_CONTROLLER(pdev->bus);
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return pfn_to_page((dma_addr - bc->baddr) >> PAGE_SHIFT);
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}
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EXPORT_SYMBOL(pci_dac_dma_to_page);
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unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
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dma64_addr_t dma_addr)
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{
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return dma_addr & ~PAGE_MASK;
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}
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EXPORT_SYMBOL(pci_dac_dma_to_offset);
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void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
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dma64_addr_t dma_addr, size_t len, int direction)
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{
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BUG_ON(direction == PCI_DMA_NONE);
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}
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EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu);
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void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
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dma64_addr_t dma_addr, size_t len, int direction)
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{
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BUG_ON(direction == PCI_DMA_NONE);
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}
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EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device);
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