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>
17 #include <asm/cache.h>
20 #include <dma-coherence.h>
22 static inline unsigned long dma_addr_to_virt(dma_addr_t dma_addr)
24 unsigned long addr = plat_dma_addr_to_phys(dma_addr);
26 return (unsigned long)phys_to_virt(addr);
30 * Warning on the terminology - Linux calls an uncached area coherent;
31 * MIPS terminology calls memory areas with hardware maintained coherency
35 static inline int cpu_is_noncoherent_r10000(struct device *dev)
37 return !plat_device_is_coherent(dev) &&
38 (current_cpu_type() == CPU_R10000 ||
39 current_cpu_type() == CPU_R12000);
42 void *dma_alloc_noncoherent(struct device *dev, size_t size,
43 dma_addr_t * dma_handle, gfp_t gfp)
47 /* ignore region specifiers */
48 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
50 if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
52 ret = (void *) __get_free_pages(gfp, get_order(size));
56 *dma_handle = plat_map_dma_mem(dev, ret, size);
62 EXPORT_SYMBOL(dma_alloc_noncoherent);
64 void *dma_alloc_coherent(struct device *dev, size_t size,
65 dma_addr_t * dma_handle, gfp_t gfp)
69 /* ignore region specifiers */
70 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
72 if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
74 ret = (void *) __get_free_pages(gfp, get_order(size));
78 *dma_handle = plat_map_dma_mem(dev, ret, size);
80 if (!plat_device_is_coherent(dev)) {
81 dma_cache_wback_inv((unsigned long) ret, size);
82 ret = UNCAC_ADDR(ret);
89 EXPORT_SYMBOL(dma_alloc_coherent);
91 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
92 dma_addr_t dma_handle)
94 free_pages((unsigned long) vaddr, get_order(size));
97 EXPORT_SYMBOL(dma_free_noncoherent);
99 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
100 dma_addr_t dma_handle)
102 unsigned long addr = (unsigned long) vaddr;
104 if (!plat_device_is_coherent(dev))
105 addr = CAC_ADDR(addr);
107 free_pages(addr, get_order(size));
110 EXPORT_SYMBOL(dma_free_coherent);
112 static inline void __dma_sync(unsigned long addr, size_t size,
113 enum dma_data_direction direction)
117 dma_cache_wback(addr, size);
120 case DMA_FROM_DEVICE:
121 dma_cache_inv(addr, size);
124 case DMA_BIDIRECTIONAL:
125 dma_cache_wback_inv(addr, size);
133 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
134 enum dma_data_direction direction)
136 unsigned long addr = (unsigned long) ptr;
138 if (!plat_device_is_coherent(dev))
139 __dma_sync(addr, size, direction);
141 return plat_map_dma_mem(dev, ptr, size);
144 EXPORT_SYMBOL(dma_map_single);
146 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
147 enum dma_data_direction direction)
149 if (cpu_is_noncoherent_r10000(dev))
150 __dma_sync(dma_addr_to_virt(dma_addr), size,
153 plat_unmap_dma_mem(dma_addr);
156 EXPORT_SYMBOL(dma_unmap_single);
158 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
159 enum dma_data_direction direction)
163 BUG_ON(direction == DMA_NONE);
165 for (i = 0; i < nents; i++, sg++) {
168 addr = (unsigned long) sg_virt(sg);
169 if (!plat_device_is_coherent(dev) && addr)
170 __dma_sync(addr, sg->length, direction);
171 sg->dma_address = plat_map_dma_mem(dev,
172 (void *)addr, sg->length);
178 EXPORT_SYMBOL(dma_map_sg);
180 dma_addr_t dma_map_page(struct device *dev, struct page *page,
181 unsigned long offset, size_t size, enum dma_data_direction direction)
183 BUG_ON(direction == DMA_NONE);
185 if (!plat_device_is_coherent(dev)) {
188 addr = (unsigned long) page_address(page) + offset;
189 dma_cache_wback_inv(addr, size);
192 return plat_map_dma_mem_page(dev, page) + offset;
195 EXPORT_SYMBOL(dma_map_page);
197 void dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
198 enum dma_data_direction direction)
200 BUG_ON(direction == DMA_NONE);
202 if (!plat_device_is_coherent(dev) && direction != DMA_TO_DEVICE) {
205 addr = plat_dma_addr_to_phys(dma_address);
206 dma_cache_wback_inv(addr, size);
209 plat_unmap_dma_mem(dma_address);
212 EXPORT_SYMBOL(dma_unmap_page);
214 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
215 enum dma_data_direction direction)
220 BUG_ON(direction == DMA_NONE);
222 for (i = 0; i < nhwentries; i++, sg++) {
223 if (!plat_device_is_coherent(dev) &&
224 direction != DMA_TO_DEVICE) {
225 addr = (unsigned long) sg_virt(sg);
227 __dma_sync(addr, sg->length, direction);
229 plat_unmap_dma_mem(sg->dma_address);
233 EXPORT_SYMBOL(dma_unmap_sg);
235 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
236 size_t size, enum dma_data_direction direction)
238 BUG_ON(direction == DMA_NONE);
240 if (cpu_is_noncoherent_r10000(dev)) {
243 addr = dma_addr_to_virt(dma_handle);
244 __dma_sync(addr, size, direction);
248 EXPORT_SYMBOL(dma_sync_single_for_cpu);
250 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
251 size_t size, enum dma_data_direction direction)
253 BUG_ON(direction == DMA_NONE);
255 if (!plat_device_is_coherent(dev)) {
258 addr = dma_addr_to_virt(dma_handle);
259 __dma_sync(addr, size, direction);
263 EXPORT_SYMBOL(dma_sync_single_for_device);
265 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
266 unsigned long offset, size_t size, enum dma_data_direction direction)
268 BUG_ON(direction == DMA_NONE);
270 if (cpu_is_noncoherent_r10000(dev)) {
273 addr = dma_addr_to_virt(dma_handle);
274 __dma_sync(addr + offset, size, direction);
278 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
280 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
281 unsigned long offset, size_t size, enum dma_data_direction direction)
283 BUG_ON(direction == DMA_NONE);
285 if (!plat_device_is_coherent(dev)) {
288 addr = dma_addr_to_virt(dma_handle);
289 __dma_sync(addr + offset, size, direction);
293 EXPORT_SYMBOL(dma_sync_single_range_for_device);
295 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
296 enum dma_data_direction direction)
300 BUG_ON(direction == DMA_NONE);
302 /* Make sure that gcc doesn't leave the empty loop body. */
303 for (i = 0; i < nelems; i++, sg++) {
304 if (cpu_is_noncoherent_r10000(dev))
305 __dma_sync((unsigned long)page_address(sg_page(sg)),
306 sg->length, direction);
307 plat_unmap_dma_mem(sg->dma_address);
311 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
313 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
314 enum dma_data_direction direction)
318 BUG_ON(direction == DMA_NONE);
320 /* Make sure that gcc doesn't leave the empty loop body. */
321 for (i = 0; i < nelems; i++, sg++) {
322 if (!plat_device_is_coherent(dev))
323 __dma_sync((unsigned long)page_address(sg_page(sg)),
324 sg->length, direction);
325 plat_unmap_dma_mem(sg->dma_address);
329 EXPORT_SYMBOL(dma_sync_sg_for_device);
331 int dma_mapping_error(dma_addr_t dma_addr)
336 EXPORT_SYMBOL(dma_mapping_error);
338 int dma_supported(struct device *dev, u64 mask)
341 * we fall back to GFP_DMA when the mask isn't all 1s,
342 * so we can't guarantee allocations that must be
343 * within a tighter range than GFP_DMA..
345 if (mask < 0x00ffffff)
351 EXPORT_SYMBOL(dma_supported);
353 int dma_is_consistent(struct device *dev, dma_addr_t dma_addr)
355 return plat_device_is_coherent(dev);
358 EXPORT_SYMBOL(dma_is_consistent);
360 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
361 enum dma_data_direction direction)
363 BUG_ON(direction == DMA_NONE);
365 if (!plat_device_is_coherent(dev))
366 dma_cache_wback_inv((unsigned long)vaddr, size);
369 EXPORT_SYMBOL(dma_cache_sync);