diff options
Diffstat (limited to 'arch/frv/mb93090-mb00/pci-dma-nommu.c')
| -rw-r--r-- | arch/frv/mb93090-mb00/pci-dma-nommu.c | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/arch/frv/mb93090-mb00/pci-dma-nommu.c b/arch/frv/mb93090-mb00/pci-dma-nommu.c deleted file mode 100644 index 4a96de7f0af4..000000000000 --- a/arch/frv/mb93090-mb00/pci-dma-nommu.c +++ /dev/null @@ -1,176 +0,0 @@ -/* pci-dma-nommu.c: Dynamic DMA mapping support for the FRV - * - * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. - * Written by David Woodhouse (dwmw2@infradead.org) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <linux/types.h> -#include <linux/slab.h> -#include <linux/export.h> -#include <linux/dma-mapping.h> -#include <linux/list.h> -#include <linux/pci.h> -#include <asm/io.h> - -#if 1 -#define DMA_SRAM_START dma_coherent_mem_start -#define DMA_SRAM_END dma_coherent_mem_end -#else // Use video RAM on Matrox -#define DMA_SRAM_START 0xe8900000 -#define DMA_SRAM_END 0xe8a00000 -#endif - -struct dma_alloc_record { - struct list_head list; - unsigned long ofs; - unsigned long len; -}; - -static DEFINE_SPINLOCK(dma_alloc_lock); -static LIST_HEAD(dma_alloc_list); - -static void *frv_dma_alloc(struct device *hwdev, size_t size, dma_addr_t *dma_handle, - gfp_t gfp, unsigned long attrs) -{ - struct dma_alloc_record *new; - struct list_head *this = &dma_alloc_list; - unsigned long flags; - unsigned long start = DMA_SRAM_START; - unsigned long end; - - if (!DMA_SRAM_START) { - printk("%s called without any DMA area reserved!\n", __func__); - return NULL; - } - - new = kmalloc(sizeof (*new), GFP_ATOMIC); - if (!new) - return NULL; - - /* Round up to a reasonable alignment */ - new->len = (size + 31) & ~31; - - spin_lock_irqsave(&dma_alloc_lock, flags); - - list_for_each (this, &dma_alloc_list) { - struct dma_alloc_record *this_r = list_entry(this, struct dma_alloc_record, list); - end = this_r->ofs; - - if (end - start >= size) - goto gotone; - - start = this_r->ofs + this_r->len; - } - /* Reached end of list. */ - end = DMA_SRAM_END; - this = &dma_alloc_list; - - if (end - start >= size) { - gotone: - new->ofs = start; - list_add_tail(&new->list, this); - spin_unlock_irqrestore(&dma_alloc_lock, flags); - - *dma_handle = start; - return (void *)start; - } - - kfree(new); - spin_unlock_irqrestore(&dma_alloc_lock, flags); - return NULL; -} - -static void frv_dma_free(struct device *hwdev, size_t size, void *vaddr, - dma_addr_t dma_handle, unsigned long attrs) -{ - struct dma_alloc_record *rec; - unsigned long flags; - - spin_lock_irqsave(&dma_alloc_lock, flags); - - list_for_each_entry(rec, &dma_alloc_list, list) { - if (rec->ofs == dma_handle) { - list_del(&rec->list); - kfree(rec); - spin_unlock_irqrestore(&dma_alloc_lock, flags); - return; - } - } - spin_unlock_irqrestore(&dma_alloc_lock, flags); - BUG(); -} - -static int frv_dma_map_sg(struct device *dev, struct scatterlist *sglist, - int nents, enum dma_data_direction direction, - unsigned long attrs) -{ - struct scatterlist *sg; - int i; - - BUG_ON(direction == DMA_NONE); - - if (attrs & DMA_ATTR_SKIP_CPU_SYNC) - return nents; - - for_each_sg(sglist, sg, nents, i) { - frv_cache_wback_inv(sg_dma_address(sg), - sg_dma_address(sg) + sg_dma_len(sg)); - } - - return nents; -} - -static dma_addr_t frv_dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction direction, unsigned long attrs) -{ - BUG_ON(direction == DMA_NONE); - - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - flush_dcache_page(page); - - return (dma_addr_t) page_to_phys(page) + offset; -} - -static void frv_dma_sync_single_for_device(struct device *dev, - dma_addr_t dma_handle, size_t size, - enum dma_data_direction direction) -{ - flush_write_buffers(); -} - -static void frv_dma_sync_sg_for_device(struct device *dev, - struct scatterlist *sg, int nelems, - enum dma_data_direction direction) -{ - flush_write_buffers(); -} - - -static int frv_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; -} - -const struct dma_map_ops frv_dma_ops = { - .alloc = frv_dma_alloc, - .free = frv_dma_free, - .map_page = frv_dma_map_page, - .map_sg = frv_dma_map_sg, - .sync_single_for_device = frv_dma_sync_single_for_device, - .sync_sg_for_device = frv_dma_sync_sg_for_device, - .dma_supported = frv_dma_supported, -}; -EXPORT_SYMBOL(frv_dma_ops); |