2 * arch/sh/mm/consistent.c
4 * Copyright (C) 2004 - 2007 Paul Mundt
6 * Declared coherent memory functions based on arch/x86/kernel/pci-dma_32.c
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
13 #include <linux/platform_device.h>
14 #include <linux/dma-mapping.h>
15 #include <asm/cacheflush.h>
16 #include <asm/addrspace.h>
19 struct dma_coherent_mem {
24 unsigned long *bitmap;
27 void *dma_alloc_coherent(struct device *dev, size_t size,
28 dma_addr_t *dma_handle, gfp_t gfp)
30 void *ret, *ret_nocache;
31 int order = get_order(size);
33 if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
36 ret = (void *)__get_free_pages(gfp, order);
42 * Pages from the page allocator may have data present in
43 * cache. So flush the cache before using uncached memory.
45 dma_cache_sync(dev, ret, size, DMA_BIDIRECTIONAL);
47 ret_nocache = ioremap_nocache(virt_to_phys(ret), size);
49 free_pages((unsigned long)ret, order);
53 *dma_handle = virt_to_phys(ret);
56 EXPORT_SYMBOL(dma_alloc_coherent);
58 void dma_free_coherent(struct device *dev, size_t size,
59 void *vaddr, dma_addr_t dma_handle)
61 struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
62 int order = get_order(size);
64 if (!dma_release_from_coherent(dev, order, vaddr)) {
65 WARN_ON(irqs_disabled()); /* for portability */
66 BUG_ON(mem && mem->flags & DMA_MEMORY_EXCLUSIVE);
67 free_pages((unsigned long)phys_to_virt(dma_handle), order);
71 EXPORT_SYMBOL(dma_free_coherent);
73 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
74 enum dma_data_direction direction)
79 void *p1addr = (void*) P1SEGADDR((unsigned long)vaddr);
83 case DMA_FROM_DEVICE: /* invalidate only */
84 __flush_invalidate_region(p1addr, size);
86 case DMA_TO_DEVICE: /* writeback only */
87 __flush_wback_region(p1addr, size);
89 case DMA_BIDIRECTIONAL: /* writeback and invalidate */
90 __flush_purge_region(p1addr, size);
96 EXPORT_SYMBOL(dma_cache_sync);
98 int platform_resource_setup_memory(struct platform_device *pdev,
99 char *name, unsigned long memsize)
102 dma_addr_t dma_handle;
105 r = pdev->resource + pdev->num_resources - 1;
107 pr_warning("%s: unable to find empty space for resource\n",
112 buf = dma_alloc_coherent(NULL, memsize, &dma_handle, GFP_KERNEL);
114 pr_warning("%s: unable to allocate memory\n", name);
118 memset(buf, 0, memsize);
120 r->flags = IORESOURCE_MEM;
121 r->start = dma_handle;
122 r->end = r->start + memsize - 1;