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/scatterlist.h>
16 #include <linux/string.h>
17 #include <linux/gfp.h>
19 #include <asm/cache.h>
22 #include <dma-coherence.h>
24 static inline unsigned long dma_addr_to_virt(struct device *dev,
27 unsigned long addr = plat_dma_addr_to_phys(dev, dma_addr);
29 return (unsigned long)phys_to_virt(addr);
33 * Warning on the terminology - Linux calls an uncached area coherent;
34 * MIPS terminology calls memory areas with hardware maintained coherency
38 static inline int cpu_is_noncoherent_r10000(struct device *dev)
40 return !plat_device_is_coherent(dev) &&
41 (current_cpu_type() == CPU_R10000 ||
42 current_cpu_type() == CPU_R12000);
45 static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
49 /* ignore region specifiers */
50 gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
57 #if defined(CONFIG_ZONE_DMA32) && defined(CONFIG_ZONE_DMA)
58 if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
60 else if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
61 dma_flag = __GFP_DMA32;
64 #if defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_ZONE_DMA)
65 if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
66 dma_flag = __GFP_DMA32;
69 #if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32)
70 if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
76 /* Don't invoke OOM killer */
79 return gfp | dma_flag;
82 void *dma_alloc_noncoherent(struct device *dev, size_t size,
83 dma_addr_t * dma_handle, gfp_t gfp)
87 gfp = massage_gfp_flags(dev, gfp);
89 ret = (void *) __get_free_pages(gfp, get_order(size));
93 *dma_handle = plat_map_dma_mem(dev, ret, size);
99 EXPORT_SYMBOL(dma_alloc_noncoherent);
101 void *dma_alloc_coherent(struct device *dev, size_t size,
102 dma_addr_t * dma_handle, gfp_t gfp)
106 if (dma_alloc_from_coherent(dev, size, dma_handle, &ret))
109 gfp = massage_gfp_flags(dev, gfp);
111 ret = (void *) __get_free_pages(gfp, get_order(size));
114 memset(ret, 0, size);
115 *dma_handle = plat_map_dma_mem(dev, ret, size);
117 if (!plat_device_is_coherent(dev)) {
118 dma_cache_wback_inv((unsigned long) ret, size);
119 ret = UNCAC_ADDR(ret);
126 EXPORT_SYMBOL(dma_alloc_coherent);
128 void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr,
129 dma_addr_t dma_handle)
131 plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
132 free_pages((unsigned long) vaddr, get_order(size));
135 EXPORT_SYMBOL(dma_free_noncoherent);
137 void dma_free_coherent(struct device *dev, size_t size, void *vaddr,
138 dma_addr_t dma_handle)
140 unsigned long addr = (unsigned long) vaddr;
141 int order = get_order(size);
143 if (dma_release_from_coherent(dev, order, vaddr))
146 plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
148 if (!plat_device_is_coherent(dev))
149 addr = CAC_ADDR(addr);
151 free_pages(addr, get_order(size));
154 EXPORT_SYMBOL(dma_free_coherent);
156 static inline void __dma_sync(unsigned long addr, size_t size,
157 enum dma_data_direction direction)
161 dma_cache_wback(addr, size);
164 case DMA_FROM_DEVICE:
165 dma_cache_inv(addr, size);
168 case DMA_BIDIRECTIONAL:
169 dma_cache_wback_inv(addr, size);
177 dma_addr_t dma_map_single(struct device *dev, void *ptr, size_t size,
178 enum dma_data_direction direction)
180 unsigned long addr = (unsigned long) ptr;
182 if (!plat_device_is_coherent(dev))
183 __dma_sync(addr, size, direction);
185 return plat_map_dma_mem(dev, ptr, size);
188 EXPORT_SYMBOL(dma_map_single);
190 void dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
191 enum dma_data_direction direction)
193 if (cpu_is_noncoherent_r10000(dev))
194 __dma_sync(dma_addr_to_virt(dev, dma_addr), size,
197 plat_unmap_dma_mem(dev, dma_addr, size, direction);
200 EXPORT_SYMBOL(dma_unmap_single);
202 int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
203 enum dma_data_direction direction)
207 BUG_ON(direction == DMA_NONE);
209 for (i = 0; i < nents; i++, sg++) {
212 addr = (unsigned long) sg_virt(sg);
213 if (!plat_device_is_coherent(dev) && addr)
214 __dma_sync(addr, sg->length, direction);
215 sg->dma_address = plat_map_dma_mem(dev,
216 (void *)addr, sg->length);
222 EXPORT_SYMBOL(dma_map_sg);
224 dma_addr_t dma_map_page(struct device *dev, struct page *page,
225 unsigned long offset, size_t size, enum dma_data_direction direction)
227 BUG_ON(direction == DMA_NONE);
229 if (!plat_device_is_coherent(dev)) {
232 addr = (unsigned long) page_address(page) + offset;
233 __dma_sync(addr, size, direction);
236 return plat_map_dma_mem_page(dev, page) + offset;
239 EXPORT_SYMBOL(dma_map_page);
241 void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
242 enum dma_data_direction direction)
247 BUG_ON(direction == DMA_NONE);
249 for (i = 0; i < nhwentries; i++, sg++) {
250 if (!plat_device_is_coherent(dev) &&
251 direction != DMA_TO_DEVICE) {
252 addr = (unsigned long) sg_virt(sg);
254 __dma_sync(addr, sg->length, direction);
256 plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
260 EXPORT_SYMBOL(dma_unmap_sg);
262 void dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle,
263 size_t size, enum dma_data_direction direction)
265 BUG_ON(direction == DMA_NONE);
267 if (cpu_is_noncoherent_r10000(dev)) {
270 addr = dma_addr_to_virt(dev, dma_handle);
271 __dma_sync(addr, size, direction);
275 EXPORT_SYMBOL(dma_sync_single_for_cpu);
277 void dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle,
278 size_t size, enum dma_data_direction direction)
280 BUG_ON(direction == DMA_NONE);
282 plat_extra_sync_for_device(dev);
283 if (!plat_device_is_coherent(dev)) {
286 addr = dma_addr_to_virt(dev, dma_handle);
287 __dma_sync(addr, size, direction);
291 EXPORT_SYMBOL(dma_sync_single_for_device);
293 void dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
294 unsigned long offset, size_t size, enum dma_data_direction direction)
296 BUG_ON(direction == DMA_NONE);
298 if (cpu_is_noncoherent_r10000(dev)) {
301 addr = dma_addr_to_virt(dev, dma_handle);
302 __dma_sync(addr + offset, size, direction);
306 EXPORT_SYMBOL(dma_sync_single_range_for_cpu);
308 void dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
309 unsigned long offset, size_t size, enum dma_data_direction direction)
311 BUG_ON(direction == DMA_NONE);
313 plat_extra_sync_for_device(dev);
314 if (!plat_device_is_coherent(dev)) {
317 addr = dma_addr_to_virt(dev, dma_handle);
318 __dma_sync(addr + offset, size, direction);
322 EXPORT_SYMBOL(dma_sync_single_range_for_device);
324 void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
325 enum dma_data_direction direction)
329 BUG_ON(direction == DMA_NONE);
331 /* Make sure that gcc doesn't leave the empty loop body. */
332 for (i = 0; i < nelems; i++, sg++) {
333 if (cpu_is_noncoherent_r10000(dev))
334 __dma_sync((unsigned long)page_address(sg_page(sg)),
335 sg->length, direction);
339 EXPORT_SYMBOL(dma_sync_sg_for_cpu);
341 void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
342 enum dma_data_direction direction)
346 BUG_ON(direction == DMA_NONE);
348 /* Make sure that gcc doesn't leave the empty loop body. */
349 for (i = 0; i < nelems; i++, sg++) {
350 if (!plat_device_is_coherent(dev))
351 __dma_sync((unsigned long)page_address(sg_page(sg)),
352 sg->length, direction);
356 EXPORT_SYMBOL(dma_sync_sg_for_device);
358 int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
360 return plat_dma_mapping_error(dev, dma_addr);
363 EXPORT_SYMBOL(dma_mapping_error);
365 int dma_supported(struct device *dev, u64 mask)
367 return plat_dma_supported(dev, mask);
370 EXPORT_SYMBOL(dma_supported);
372 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
373 enum dma_data_direction direction)
375 BUG_ON(direction == DMA_NONE);
377 plat_extra_sync_for_device(dev);
378 if (!plat_device_is_coherent(dev))
379 __dma_sync((unsigned long)vaddr, size, direction);
382 EXPORT_SYMBOL(dma_cache_sync);