/* * 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, 06 Ralf Baechle <ralf@linux-mips.org> * swiped from i386, and cloned for MIPS by Geert, polished by Ralf. */ #include <linux/types.h> #include <linux/dma-mapping.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/scatterlist.h> #include <linux/string.h> #include <asm/cache.h> #include <asm/io.h> #include <dma-coherence.h> static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr) { unsigned long addr = plat_dma_addr_to_phys(dma_addr); return (unsigned long)phys_to_virt(addr); } /* * Warning on the terminology - Linux calls an uncached area coherent; * MIPS terminology calls memory areas with hardware maintained coherency * coherent. */ static inline int cpu_is_noncoherent_r10000(struct device *dev) { return !plat_device_is_coherent(dev) && (current_cpu_type() == CPU_R10000 || current_cpu_type() == CPU_R12000); } static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp) { /* ignore region specifiers */ gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); #ifdef CONFIG_ZONE_DMA if (dev == NULL) gfp |= __GFP_DMA; else if (dev->coherent_dma_mask < DMA_BIT_MASK(24)) gfp |= __GFP_DMA; else #endif #ifdef CONFIG_ZONE_DMA32 if (dev->coherent_dma_mask < DMA_BIT_MASK(32)) gfp |= __GFP_DMA32; else #endif ; /* Don't invoke OOM killer */ gfp |= __GFP_NORETRY; return gfp; } void *dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t * dma_handle, gfp_t gfp) { void *ret; gfp = massage_gfp_flags(dev, gfp); ret = (void *) __get_free_pages(gfp, get_order(size)); if (ret != NULL) { memset(ret, 0, size); *dma_handle = plat_map_dma_mem(dev, ret, size); } return ret; } EXPORT_SYMBOL(dma_alloc_noncoherent); void *dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t * dma_handle, gfp_t gfp) { void *ret; gfp = massage_gfp_flags(dev, gfp); ret = (void *) __get_free_pages(gfp, get_order(size)); if (ret) { memset(ret, 0, size); *dma_handle = plat_map_dma_mem(dev, ret, size); if (!plat_device_is_coherent(dev)) { dma_cache_wback_inv((unsigned long) ret, size); ret = UNCAC_ADDR(ret); } } return ret; } EXPORT_SYMBOL(dma_alloc_coherent); void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle) { free_pages((unsigned long) vaddr, 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) { unsigned long addr = (unsigned long) vaddr; if (!plat_device_is_coherent(dev)) addr = CAC_ADDR(addr); free_pages(addr, get_order(size)); } EXPORT_SYMBOL(dma_free_coherent); static inline void __dma_sync(unsigned long addr, size_t size, enum dma_data_direction direction) { switch (direction) { case DMA_TO_DEVICE: dma_cache_wback(addr, size); break; case DMA_FROM_DEVICE: dma_cache_inv(addr, size); break; case DMA_BIDIRECTIONAL: dma_cache_wback_inv(addr, size); break; default: BUG(); } } dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size, enum dma_data_direction direction) { unsigned long addr = (unsigned long) ptr; if (!plat_device_is_coherent(dev)) __dma_sync(addr, size, direction); return plat_map_dma_mem(dev, ptr, size); } 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) { if (cpu_is_noncoherent_r10000(dev)) __dma_sync(dma_addr_to_virt(dma_addr), size, direction); plat_unmap_dma_mem(dma_addr); } 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++) { unsigned long addr; addr = (unsigned long) sg_virt(sg); if (!plat_device_is_coherent(dev) && addr) __dma_sync(addr, sg->length, direction); sg->dma_address = plat_map_dma_mem(dev, (void *)addr, sg->length); } 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); if (!plat_device_is_coherent(dev)) { unsigned long addr; addr = (unsigned long) page_address(page) + offset; dma_cache_wback_inv(addr, size); } return plat_map_dma_mem_page(dev, 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); if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) { unsigned long addr; addr = plat_dma_addr_to_phys(dma_address); dma_cache_wback_inv(addr, size); } plat_unmap_dma_mem(dma_address); } EXPORT_SYMBOL(dma_unmap_page); void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, enum dma_data_direction direction) { unsigned long addr; int i; BUG_ON(direction == DMA_NONE); for (i = 0; i < nhwentries; i++, sg++) { if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) { addr = (unsigned long) sg_virt(sg); if (addr) __dma_sync(addr, sg->length, direction); } plat_unmap_dma_mem(sg->dma_address); } } 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); if (cpu_is_noncoherent_r10000(dev)) { unsigned long addr; addr = dma_addr_to_virt(dma_handle); __dma_sync(addr, size, direction); } } 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); if (!plat_device_is_coherent(dev)) { unsigned long addr; addr = dma_addr_to_virt(dma_handle); __dma_sync(addr, size, direction); } } 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); if (cpu_is_noncoherent_r10000(dev)) { unsigned long addr; addr = dma_addr_to_virt(dma_handle); __dma_sync(addr + offset, size, direction); } } 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); if (!plat_device_is_coherent(dev)) { unsigned long addr; addr = dma_addr_to_virt(dma_handle); __dma_sync(addr + offset, size, direction); } } 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) { int i; BUG_ON(direction == DMA_NONE); /* Make sure that gcc doesn't leave the empty loop body. */ for (i = 0; i < nelems; i++, sg++) { if (cpu_is_noncoherent_r10000(dev)) __dma_sync((unsigned long)page_address(sg_page(sg)), sg->length, direction); plat_unmap_dma_mem(sg->dma_address); } } 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) { int i; BUG_ON(direction == DMA_NONE); /* Make sure that gcc doesn't leave the empty loop body. */ for (i = 0; i < nelems; i++, sg++) { if (!plat_device_is_coherent(dev)) __dma_sync((unsigned long)page_address(sg_page(sg)), sg->length, direction); plat_unmap_dma_mem(sg->dma_address); } } 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 < DMA_BIT_MASK(24)) return 0; return 1; } EXPORT_SYMBOL(dma_supported); int dma_is_consistent(struct device *dev, dma_addr_t dma_addr) { return plat_device_is_coherent(dev); } EXPORT_SYMBOL(dma_is_consistent); void dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction) { BUG_ON(direction == DMA_NONE); if (!plat_device_is_coherent(dev)) dma_cache_wback_inv((unsigned long)vaddr, size); } EXPORT_SYMBOL(dma_cache_sync);