2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
7 * Copyright (C) 2000, 2001, 06 Ralf Baechle <ralf@linux-mips.org>
8 * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
11 #include <linux/types.h>
12 #include <linux/dma-mapping.h>
14 #include <linux/module.h>
15 #include <linux/string.h>
16 #include <linux/scatterlist.h>
18 #include <asm/cache.h>
21 #include <dma-coherence.h>
23 static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr)
25 unsigned long addr = plat_dma_addr_to_phys(dma_addr);
27 return (unsigned long)phys_to_virt(addr);
31 * Warning on the terminology - Linux calls an uncached area coherent;
32 * MIPS terminology calls memory areas with hardware maintained coherency
36 static inline int cpu_is_noncoherent_r10000(struct device *dev)
38 return !plat_device_is_coherent(dev) &&
39 (current_cpu_type() == CPU_R10000 ||
40 current_cpu_type() == CPU_R12000);
43 void *dma_alloc_noncoherent(struct device *dev, size_t size,
44 dma_addr_t * dma_handle, gfp_t gfp)
48 /* ignore region specifiers */
49 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
51 if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
53 ret = (void *) __get_free_pages(gfp, get_order(size));
57 *dma_handle = plat_map_dma_mem(dev, ret, size);
63 EXPORT_SYMBOL(dma_alloc_noncoherent);
65 void *dma_alloc_coherent(struct device *dev, size_t size,
66 dma_addr_t * dma_handle, gfp_t gfp)
70 /* ignore region specifiers */
71 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
73 if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
75 ret = (void *) __get_free_pages(gfp, get_order(size));
79 *dma_handle = plat_map_dma_mem(dev, ret, size);
81 if (!plat_device_is_coherent(dev)) {
82 dma_cache_wback_inv((unsigned long) ret, size);
83 ret = UNCAC_ADDR(ret);
90 EXPORT_SYMBOL(dma_alloc_coherent);
92 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
93 dma_addr_t dma_handle)
95 free_pages((unsigned long) vaddr, get_order(size));
98 EXPORT_SYMBOL(dma_free_noncoherent);
100 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
101 dma_addr_t dma_handle)
103 unsigned long addr = (unsigned long) vaddr;
105 if (!plat_device_is_coherent(dev))
106 addr = CAC_ADDR(addr);
108 free_pages(addr, get_order(size));
111 EXPORT_SYMBOL(dma_free_coherent);
113 static inline void __dma_sync(unsigned long addr, size_t size,
114 enum dma_data_direction direction)
118 dma_cache_wback(addr, size);
121 case DMA_FROM_DEVICE:
122 dma_cache_inv(addr, size);
125 case DMA_BIDIRECTIONAL:
126 dma_cache_wback_inv(addr, size);
134 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
135 enum dma_data_direction direction)
137 unsigned long addr = (unsigned long) ptr;
139 if (!plat_device_is_coherent(dev))
140 __dma_sync(addr, size, direction);
142 return plat_map_dma_mem(dev, ptr, size);
145 EXPORT_SYMBOL(dma_map_single);
147 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
148 enum dma_data_direction direction)
150 if (cpu_is_noncoherent_r10000(dev))
151 __dma_sync(dma_addr_to_virt(dma_addr), size,
154 plat_unmap_dma_mem(dma_addr);
157 EXPORT_SYMBOL(dma_unmap_single);
159 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
160 enum dma_data_direction direction)
164 BUG_ON(direction == DMA_NONE);
166 for (i = 0; i < nents; i++, sg++) {
169 addr = (unsigned long) sg_virt(sg);
170 if (!plat_device_is_coherent(dev) && addr)
171 __dma_sync(addr, sg->length, direction);
172 sg->dma_address = plat_map_dma_mem(dev,
173 (void *)addr, sg->length);
179 EXPORT_SYMBOL(dma_map_sg);
181 dma_addr_t dma_map_page(struct device *dev, struct page *page,
182 unsigned long offset, size_t size, enum dma_data_direction direction)
184 BUG_ON(direction == DMA_NONE);
186 if (!plat_device_is_coherent(dev)) {
189 addr = (unsigned long) page_address(page) + offset;
190 dma_cache_wback_inv(addr, size);
193 return plat_map_dma_mem_page(dev, page) + offset;
196 EXPORT_SYMBOL(dma_map_page);
198 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
199 enum dma_data_direction direction)
201 BUG_ON(direction == DMA_NONE);
203 if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
206 addr = plat_dma_addr_to_phys(dma_address);
207 dma_cache_wback_inv(addr, size);
210 plat_unmap_dma_mem(dma_address);
213 EXPORT_SYMBOL(dma_unmap_page);
215 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
216 enum dma_data_direction direction)
221 BUG_ON(direction == DMA_NONE);
223 for (i = 0; i < nhwentries; i++, sg++) {
224 if (!plat_device_is_coherent(dev) &&
225 direction != DMA_TO_DEVICE) {
226 addr = (unsigned long) sg_virt(sg);
228 __dma_sync(addr, sg->length, direction);
230 plat_unmap_dma_mem(sg->dma_address);
234 EXPORT_SYMBOL(dma_unmap_sg);
236 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
237 size_t size, enum dma_data_direction direction)
239 BUG_ON(direction == DMA_NONE);
241 if (cpu_is_noncoherent_r10000(dev)) {
244 addr = dma_addr_to_virt(dma_handle);
245 __dma_sync(addr, size, direction);
249 EXPORT_SYMBOL(dma_sync_single_for_cpu);
251 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
252 size_t size, enum dma_data_direction direction)
254 BUG_ON(direction == DMA_NONE);
256 if (!plat_device_is_coherent(dev)) {
259 addr = dma_addr_to_virt(dma_handle);
260 __dma_sync(addr, size, direction);
264 EXPORT_SYMBOL(dma_sync_single_for_device);
266 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
267 unsigned long offset, size_t size, enum dma_data_direction direction)
269 BUG_ON(direction == DMA_NONE);
271 if (cpu_is_noncoherent_r10000(dev)) {
274 addr = dma_addr_to_virt(dma_handle);
275 __dma_sync(addr + offset, size, direction);
279 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
281 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
282 unsigned long offset, size_t size, enum dma_data_direction direction)
284 BUG_ON(direction == DMA_NONE);
286 if (!plat_device_is_coherent(dev)) {
289 addr = dma_addr_to_virt(dma_handle);
290 __dma_sync(addr + offset, size, direction);
294 EXPORT_SYMBOL(dma_sync_single_range_for_device);
296 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
297 enum dma_data_direction direction)
301 BUG_ON(direction == DMA_NONE);
303 /* Make sure that gcc doesn't leave the empty loop body. */
304 for (i = 0; i < nelems; i++, sg++) {
305 if (cpu_is_noncoherent_r10000(dev))
306 __dma_sync((unsigned long)page_address(sg_page(sg)),
307 sg->length, direction);
308 plat_unmap_dma_mem(sg->dma_address);
312 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
314 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
315 enum dma_data_direction direction)
319 BUG_ON(direction == DMA_NONE);
321 /* Make sure that gcc doesn't leave the empty loop body. */
322 for (i = 0; i < nelems; i++, sg++) {
323 if (!plat_device_is_coherent(dev))
324 __dma_sync((unsigned long)page_address(sg_page(sg)),
325 sg->length, direction);
326 plat_unmap_dma_mem(sg->dma_address);
330 EXPORT_SYMBOL(dma_sync_sg_for_device);
332 int dma_mapping_error(dma_addr_t dma_addr)
337 EXPORT_SYMBOL(dma_mapping_error);
339 int dma_supported(struct device *dev, u64 mask)
342 * we fall back to GFP_DMA when the mask isn't all 1s,
343 * so we can't guarantee allocations that must be
344 * within a tighter range than GFP_DMA..
346 if (mask < 0x00ffffff)
352 EXPORT_SYMBOL(dma_supported);
354 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
356 return plat_device_is_coherent(dev);
359 EXPORT_SYMBOL(dma_is_consistent);
361 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
362 enum dma_data_direction direction)
364 BUG_ON(direction == DMA_NONE);
366 if (!plat_device_is_coherent(dev))
367 dma_cache_wback_inv((unsigned long)vaddr, size);
370 EXPORT_SYMBOL(dma_cache_sync);