diff options
Diffstat (limited to 'arch/blackfin/kernel/dma-mapping.c')
| -rw-r--r-- | arch/blackfin/kernel/dma-mapping.c | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/arch/blackfin/kernel/dma-mapping.c b/arch/blackfin/kernel/dma-mapping.c deleted file mode 100644 index 477bb29a7987..000000000000 --- a/arch/blackfin/kernel/dma-mapping.c +++ /dev/null @@ -1,172 +0,0 @@ -/* - * Dynamic DMA mapping support - * - * Copyright 2005-2009 Analog Devices Inc. - * - * Licensed under the GPL-2 or later - */ - -#include <linux/types.h> -#include <linux/gfp.h> -#include <linux/string.h> -#include <linux/spinlock.h> -#include <linux/dma-mapping.h> -#include <linux/scatterlist.h> -#include <linux/export.h> -#include <linux/bitmap.h> - -static spinlock_t dma_page_lock; -static unsigned long *dma_page; -static unsigned int dma_pages; -static unsigned long dma_base; -static unsigned long dma_size; -static unsigned int dma_initialized; - -static void dma_alloc_init(unsigned long start, unsigned long end) -{ - spin_lock_init(&dma_page_lock); - dma_initialized = 0; - - dma_page = (unsigned long *)__get_free_page(GFP_KERNEL); - memset(dma_page, 0, PAGE_SIZE); - dma_base = PAGE_ALIGN(start); - dma_size = PAGE_ALIGN(end) - PAGE_ALIGN(start); - dma_pages = dma_size >> PAGE_SHIFT; - memset((void *)dma_base, 0, DMA_UNCACHED_REGION); - dma_initialized = 1; - - printk(KERN_INFO "%s: dma_page @ 0x%p - %d pages at 0x%08lx\n", __func__, - dma_page, dma_pages, dma_base); -} - -static inline unsigned int get_pages(size_t size) -{ - return ((size - 1) >> PAGE_SHIFT) + 1; -} - -static unsigned long __alloc_dma_pages(unsigned int pages) -{ - unsigned long ret = 0, flags; - unsigned long start; - - if (dma_initialized == 0) - dma_alloc_init(_ramend - DMA_UNCACHED_REGION, _ramend); - - spin_lock_irqsave(&dma_page_lock, flags); - - start = bitmap_find_next_zero_area(dma_page, dma_pages, 0, pages, 0); - if (start < dma_pages) { - ret = dma_base + (start << PAGE_SHIFT); - bitmap_set(dma_page, start, pages); - } - spin_unlock_irqrestore(&dma_page_lock, flags); - return ret; -} - -static void __free_dma_pages(unsigned long addr, unsigned int pages) -{ - unsigned long page = (addr - dma_base) >> PAGE_SHIFT; - unsigned long flags; - - if ((page + pages) > dma_pages) { - printk(KERN_ERR "%s: freeing outside range.\n", __func__); - BUG(); - } - - spin_lock_irqsave(&dma_page_lock, flags); - bitmap_clear(dma_page, page, pages); - spin_unlock_irqrestore(&dma_page_lock, flags); -} - -static void *bfin_dma_alloc(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) -{ - void *ret; - - ret = (void *)__alloc_dma_pages(get_pages(size)); - - if (ret) { - memset(ret, 0, size); - *dma_handle = virt_to_phys(ret); - } - - return ret; -} - -static void bfin_dma_free(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, unsigned long attrs) -{ - __free_dma_pages((unsigned long)vaddr, get_pages(size)); -} - -/* - * Streaming DMA mappings - */ -void __dma_sync(dma_addr_t addr, size_t size, - enum dma_data_direction dir) -{ - __dma_sync_inline(addr, size, dir); -} -EXPORT_SYMBOL(__dma_sync); - -static int bfin_dma_map_sg(struct device *dev, struct scatterlist *sg_list, - int nents, enum dma_data_direction direction, - unsigned long attrs) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sg_list, sg, nents, i) { - sg->dma_address = (dma_addr_t) sg_virt(sg); - - if (attrs & DMA_ATTR_SKIP_CPU_SYNC) - continue; - - __dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction); - } - - return nents; -} - -static void bfin_dma_sync_sg_for_device(struct device *dev, - struct scatterlist *sg_list, int nelems, - enum dma_data_direction direction) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sg_list, sg, nelems, i) { - sg->dma_address = (dma_addr_t) sg_virt(sg); - __dma_sync(sg_dma_address(sg), sg_dma_len(sg), direction); - } -} - -static dma_addr_t bfin_dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - dma_addr_t handle = (dma_addr_t)(page_address(page) + offset); - - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - _dma_sync(handle, size, dir); - - return handle; -} - -static inline void bfin_dma_sync_single_for_device(struct device *dev, - dma_addr_t handle, size_t size, enum dma_data_direction dir) -{ - _dma_sync(handle, size, dir); -} - -const struct dma_map_ops bfin_dma_ops = { - .alloc = bfin_dma_alloc, - .free = bfin_dma_free, - - .map_page = bfin_dma_map_page, - .map_sg = bfin_dma_map_sg, - - .sync_single_for_device = bfin_dma_sync_single_for_device, - .sync_sg_for_device = bfin_dma_sync_sg_for_device, -}; -EXPORT_SYMBOL(bfin_dma_ops); |