diff options
Diffstat (limited to 'arch/microblaze/kernel/dma.c')
| -rw-r--r-- | arch/microblaze/kernel/dma.c | 207 |
1 files changed, 23 insertions, 184 deletions
diff --git a/arch/microblaze/kernel/dma.c b/arch/microblaze/kernel/dma.c index da68d00fd087..04d091ade417 100644 --- a/arch/microblaze/kernel/dma.c +++ b/arch/microblaze/kernel/dma.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2009-2010 PetaLogix * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation @@ -7,198 +8,36 @@ */ #include <linux/device.h> -#include <linux/dma-mapping.h> +#include <linux/dma-map-ops.h> #include <linux/gfp.h> -#include <linux/dma-debug.h> #include <linux/export.h> #include <linux/bug.h> - -/* - * Generic direct DMA implementation - * - * This implementation supports a per-device offset that can be applied if - * the address at which memory is visible to devices is not 0. Platform code - * can set archdata.dma_data to an unsigned long holding the offset. By - * default the offset is PCI_DRAM_OFFSET. - */ - -static unsigned long get_dma_direct_offset(struct device *dev) -{ - if (likely(dev)) - return (unsigned long)dev->archdata.dma_data; - - return PCI_DRAM_OFFSET; /* FIXME Not sure if is correct */ -} - -#define NOT_COHERENT_CACHE - -static void *dma_direct_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag, - struct dma_attrs *attrs) -{ -#ifdef NOT_COHERENT_CACHE - return consistent_alloc(flag, size, dma_handle); -#else - void *ret; - struct page *page; - int node = dev_to_node(dev); - - /* ignore region specifiers */ - flag &= ~(__GFP_HIGHMEM); - - page = alloc_pages_node(node, flag, get_order(size)); - if (page == NULL) - return NULL; - ret = page_address(page); - memset(ret, 0, size); - *dma_handle = virt_to_phys(ret) + get_dma_direct_offset(dev); - - return ret; -#endif -} - -static void dma_direct_free_coherent(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle, - struct dma_attrs *attrs) -{ -#ifdef NOT_COHERENT_CACHE - consistent_free(size, vaddr); -#else - free_pages((unsigned long)vaddr, get_order(size)); -#endif -} - -static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction direction, - struct dma_attrs *attrs) -{ - struct scatterlist *sg; - int i; - - /* FIXME this part of code is untested */ - for_each_sg(sgl, sg, nents, i) { - sg->dma_address = sg_phys(sg) + get_dma_direct_offset(dev); - __dma_sync(page_to_phys(sg_page(sg)) + sg->offset, - sg->length, direction); +#include <asm/cacheflush.h> + +static void __dma_sync(phys_addr_t paddr, size_t size, + enum dma_data_direction direction) +{ + switch (direction) { + case DMA_TO_DEVICE: + case DMA_BIDIRECTIONAL: + flush_dcache_range(paddr, paddr + size); + break; + case DMA_FROM_DEVICE: + invalidate_dcache_range(paddr, paddr + size); + break; + default: + BUG(); } - - return nents; -} - -static void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction direction, - struct dma_attrs *attrs) -{ -} - -static int dma_direct_dma_supported(struct device *dev, u64 mask) -{ - return 1; -} - -static inline dma_addr_t dma_direct_map_page(struct device *dev, - struct page *page, - unsigned long offset, - size_t size, - enum dma_data_direction direction, - struct dma_attrs *attrs) -{ - __dma_sync(page_to_phys(page) + offset, size, direction); - return page_to_phys(page) + offset + get_dma_direct_offset(dev); -} - -static inline void dma_direct_unmap_page(struct device *dev, - dma_addr_t dma_address, - size_t size, - enum dma_data_direction direction, - struct dma_attrs *attrs) -{ -/* There is not necessary to do cache cleanup - * - * phys_to_virt is here because in __dma_sync_page is __virt_to_phys and - * dma_address is physical address - */ - __dma_sync(dma_address, size, direction); -} - -static inline void -dma_direct_sync_single_for_cpu(struct device *dev, - dma_addr_t dma_handle, size_t size, - enum dma_data_direction direction) -{ - /* - * It's pointless to flush the cache as the memory segment - * is given to the CPU - */ - - if (direction == DMA_FROM_DEVICE) - __dma_sync(dma_handle, size, direction); } -static inline void -dma_direct_sync_single_for_device(struct device *dev, - dma_addr_t dma_handle, size_t size, - enum dma_data_direction direction) +void arch_sync_dma_for_device(phys_addr_t paddr, size_t size, + enum dma_data_direction dir) { - /* - * It's pointless to invalidate the cache if the device isn't - * supposed to write to the relevant region - */ - - if (direction == DMA_TO_DEVICE) - __dma_sync(dma_handle, size, direction); + __dma_sync(paddr, size, dir); } -static inline void -dma_direct_sync_sg_for_cpu(struct device *dev, - struct scatterlist *sgl, int nents, - enum dma_data_direction direction) +void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, + enum dma_data_direction dir) { - struct scatterlist *sg; - int i; - - /* FIXME this part of code is untested */ - if (direction == DMA_FROM_DEVICE) - for_each_sg(sgl, sg, nents, i) - __dma_sync(sg->dma_address, sg->length, direction); -} - -static inline void -dma_direct_sync_sg_for_device(struct device *dev, - struct scatterlist *sgl, int nents, - enum dma_data_direction direction) -{ - struct scatterlist *sg; - int i; - - /* FIXME this part of code is untested */ - if (direction == DMA_TO_DEVICE) - for_each_sg(sgl, sg, nents, i) - __dma_sync(sg->dma_address, sg->length, direction); -} - -struct dma_map_ops dma_direct_ops = { - .alloc = dma_direct_alloc_coherent, - .free = dma_direct_free_coherent, - .map_sg = dma_direct_map_sg, - .unmap_sg = dma_direct_unmap_sg, - .dma_supported = dma_direct_dma_supported, - .map_page = dma_direct_map_page, - .unmap_page = dma_direct_unmap_page, - .sync_single_for_cpu = dma_direct_sync_single_for_cpu, - .sync_single_for_device = dma_direct_sync_single_for_device, - .sync_sg_for_cpu = dma_direct_sync_sg_for_cpu, - .sync_sg_for_device = dma_direct_sync_sg_for_device, -}; -EXPORT_SYMBOL(dma_direct_ops); - -/* Number of entries preallocated for DMA-API debugging */ -#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16) - -static int __init dma_init(void) -{ - dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); - - return 0; + __dma_sync(paddr, size, dir); } -fs_initcall(dma_init); 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