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path: root/drivers/ieee1394/dma.c
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Diffstat (limited to 'drivers/ieee1394/dma.c')
-rw-r--r--drivers/ieee1394/dma.c73
1 files changed, 45 insertions, 28 deletions
diff --git a/drivers/ieee1394/dma.c b/drivers/ieee1394/dma.c
index b79ddb43e746..9fb2769d9abc 100644
--- a/drivers/ieee1394/dma.c
+++ b/drivers/ieee1394/dma.c
@@ -23,7 +23,8 @@ void dma_prog_region_init(struct dma_prog_region *prog)
23 prog->bus_addr = 0; 23 prog->bus_addr = 0;
24} 24}
25 25
26int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes, struct pci_dev *dev) 26int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
27 struct pci_dev *dev)
27{ 28{
28 /* round up to page size */ 29 /* round up to page size */
29 n_bytes = PAGE_ALIGN(n_bytes); 30 n_bytes = PAGE_ALIGN(n_bytes);
@@ -32,7 +33,8 @@ int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
32 33
33 prog->kvirt = pci_alloc_consistent(dev, n_bytes, &prog->bus_addr); 34 prog->kvirt = pci_alloc_consistent(dev, n_bytes, &prog->bus_addr);
34 if (!prog->kvirt) { 35 if (!prog->kvirt) {
35 printk(KERN_ERR "dma_prog_region_alloc: pci_alloc_consistent() failed\n"); 36 printk(KERN_ERR
37 "dma_prog_region_alloc: pci_alloc_consistent() failed\n");
36 dma_prog_region_free(prog); 38 dma_prog_region_free(prog);
37 return -ENOMEM; 39 return -ENOMEM;
38 } 40 }
@@ -45,7 +47,8 @@ int dma_prog_region_alloc(struct dma_prog_region *prog, unsigned long n_bytes,
45void dma_prog_region_free(struct dma_prog_region *prog) 47void dma_prog_region_free(struct dma_prog_region *prog)
46{ 48{
47 if (prog->kvirt) { 49 if (prog->kvirt) {
48 pci_free_consistent(prog->dev, prog->n_pages << PAGE_SHIFT, prog->kvirt, prog->bus_addr); 50 pci_free_consistent(prog->dev, prog->n_pages << PAGE_SHIFT,
51 prog->kvirt, prog->bus_addr);
49 } 52 }
50 53
51 prog->kvirt = NULL; 54 prog->kvirt = NULL;
@@ -65,7 +68,8 @@ void dma_region_init(struct dma_region *dma)
65 dma->sglist = NULL; 68 dma->sglist = NULL;
66} 69}
67 70
68int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, struct pci_dev *dev, int direction) 71int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes,
72 struct pci_dev *dev, int direction)
69{ 73{
70 unsigned int i; 74 unsigned int i;
71 75
@@ -95,14 +99,16 @@ int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, struct pci_d
95 99
96 /* fill scatter/gather list with pages */ 100 /* fill scatter/gather list with pages */
97 for (i = 0; i < dma->n_pages; i++) { 101 for (i = 0; i < dma->n_pages; i++) {
98 unsigned long va = (unsigned long) dma->kvirt + (i << PAGE_SHIFT); 102 unsigned long va =
103 (unsigned long)dma->kvirt + (i << PAGE_SHIFT);
99 104
100 dma->sglist[i].page = vmalloc_to_page((void *)va); 105 dma->sglist[i].page = vmalloc_to_page((void *)va);
101 dma->sglist[i].length = PAGE_SIZE; 106 dma->sglist[i].length = PAGE_SIZE;
102 } 107 }
103 108
104 /* map sglist to the IOMMU */ 109 /* map sglist to the IOMMU */
105 dma->n_dma_pages = pci_map_sg(dev, dma->sglist, dma->n_pages, direction); 110 dma->n_dma_pages =
111 pci_map_sg(dev, dma->sglist, dma->n_pages, direction);
106 112
107 if (dma->n_dma_pages == 0) { 113 if (dma->n_dma_pages == 0) {
108 printk(KERN_ERR "dma_region_alloc: pci_map_sg() failed\n"); 114 printk(KERN_ERR "dma_region_alloc: pci_map_sg() failed\n");
@@ -114,7 +120,7 @@ int dma_region_alloc(struct dma_region *dma, unsigned long n_bytes, struct pci_d
114 120
115 return 0; 121 return 0;
116 122
117err: 123 err:
118 dma_region_free(dma); 124 dma_region_free(dma);
119 return -ENOMEM; 125 return -ENOMEM;
120} 126}
@@ -122,7 +128,8 @@ err:
122void dma_region_free(struct dma_region *dma) 128void dma_region_free(struct dma_region *dma)
123{ 129{
124 if (dma->n_dma_pages) { 130 if (dma->n_dma_pages) {
125 pci_unmap_sg(dma->dev, dma->sglist, dma->n_pages, dma->direction); 131 pci_unmap_sg(dma->dev, dma->sglist, dma->n_pages,
132 dma->direction);
126 dma->n_dma_pages = 0; 133 dma->n_dma_pages = 0;
127 dma->dev = NULL; 134 dma->dev = NULL;
128 } 135 }
@@ -137,7 +144,8 @@ void dma_region_free(struct dma_region *dma)
137 144
138/* find the scatterlist index and remaining offset corresponding to a 145/* find the scatterlist index and remaining offset corresponding to a
139 given offset from the beginning of the buffer */ 146 given offset from the beginning of the buffer */
140static inline int dma_region_find(struct dma_region *dma, unsigned long offset, unsigned long *rem) 147static inline int dma_region_find(struct dma_region *dma, unsigned long offset,
148 unsigned long *rem)
141{ 149{
142 int i; 150 int i;
143 unsigned long off = offset; 151 unsigned long off = offset;
@@ -156,15 +164,18 @@ static inline int dma_region_find(struct dma_region *dma, unsigned long offset,
156 return i; 164 return i;
157} 165}
158 166
159dma_addr_t dma_region_offset_to_bus(struct dma_region *dma, unsigned long offset) 167dma_addr_t dma_region_offset_to_bus(struct dma_region * dma,
168 unsigned long offset)
160{ 169{
161 unsigned long rem = 0; 170 unsigned long rem = 0;
162 171
163 struct scatterlist *sg = &dma->sglist[dma_region_find(dma, offset, &rem)]; 172 struct scatterlist *sg =
173 &dma->sglist[dma_region_find(dma, offset, &rem)];
164 return sg_dma_address(sg) + rem; 174 return sg_dma_address(sg) + rem;
165} 175}
166 176
167void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, unsigned long len) 177void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset,
178 unsigned long len)
168{ 179{
169 int first, last; 180 int first, last;
170 unsigned long rem; 181 unsigned long rem;
@@ -175,10 +186,12 @@ void dma_region_sync_for_cpu(struct dma_region *dma, unsigned long offset, unsig
175 first = dma_region_find(dma, offset, &rem); 186 first = dma_region_find(dma, offset, &rem);
176 last = dma_region_find(dma, offset + len - 1, &rem); 187 last = dma_region_find(dma, offset + len - 1, &rem);
177 188
178 pci_dma_sync_sg_for_cpu(dma->dev, &dma->sglist[first], last - first + 1, dma->direction); 189 pci_dma_sync_sg_for_cpu(dma->dev, &dma->sglist[first], last - first + 1,
190 dma->direction);
179} 191}
180 192
181void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset, unsigned long len) 193void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset,
194 unsigned long len)
182{ 195{
183 int first, last; 196 int first, last;
184 unsigned long rem; 197 unsigned long rem;
@@ -189,44 +202,47 @@ void dma_region_sync_for_device(struct dma_region *dma, unsigned long offset, un
189 first = dma_region_find(dma, offset, &rem); 202 first = dma_region_find(dma, offset, &rem);
190 last = dma_region_find(dma, offset + len - 1, &rem); 203 last = dma_region_find(dma, offset + len - 1, &rem);
191 204
192 pci_dma_sync_sg_for_device(dma->dev, &dma->sglist[first], last - first + 1, dma->direction); 205 pci_dma_sync_sg_for_device(dma->dev, &dma->sglist[first],
206 last - first + 1, dma->direction);
193} 207}
194 208
195#ifdef CONFIG_MMU 209#ifdef CONFIG_MMU
196 210
197/* nopage() handler for mmap access */ 211/* nopage() handler for mmap access */
198 212
199static struct page* 213static struct page *dma_region_pagefault(struct vm_area_struct *area,
200dma_region_pagefault(struct vm_area_struct *area, unsigned long address, int *type) 214 unsigned long address, int *type)
201{ 215{
202 unsigned long offset; 216 unsigned long offset;
203 unsigned long kernel_virt_addr; 217 unsigned long kernel_virt_addr;
204 struct page *ret = NOPAGE_SIGBUS; 218 struct page *ret = NOPAGE_SIGBUS;
205 219
206 struct dma_region *dma = (struct dma_region*) area->vm_private_data; 220 struct dma_region *dma = (struct dma_region *)area->vm_private_data;
207 221
208 if (!dma->kvirt) 222 if (!dma->kvirt)
209 goto out; 223 goto out;
210 224
211 if ( (address < (unsigned long) area->vm_start) || 225 if ((address < (unsigned long)area->vm_start) ||
212 (address > (unsigned long) area->vm_start + (dma->n_pages << PAGE_SHIFT)) ) 226 (address >
227 (unsigned long)area->vm_start + (dma->n_pages << PAGE_SHIFT)))
213 goto out; 228 goto out;
214 229
215 if (type) 230 if (type)
216 *type = VM_FAULT_MINOR; 231 *type = VM_FAULT_MINOR;
217 offset = address - area->vm_start; 232 offset = address - area->vm_start;
218 kernel_virt_addr = (unsigned long) dma->kvirt + offset; 233 kernel_virt_addr = (unsigned long)dma->kvirt + offset;
219 ret = vmalloc_to_page((void*) kernel_virt_addr); 234 ret = vmalloc_to_page((void *)kernel_virt_addr);
220 get_page(ret); 235 get_page(ret);
221out: 236 out:
222 return ret; 237 return ret;
223} 238}
224 239
225static struct vm_operations_struct dma_region_vm_ops = { 240static struct vm_operations_struct dma_region_vm_ops = {
226 .nopage = dma_region_pagefault, 241 .nopage = dma_region_pagefault,
227}; 242};
228 243
229int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma) 244int dma_region_mmap(struct dma_region *dma, struct file *file,
245 struct vm_area_struct *vma)
230{ 246{
231 unsigned long size; 247 unsigned long size;
232 248
@@ -250,11 +266,12 @@ int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_st
250 return 0; 266 return 0;
251} 267}
252 268
253#else /* CONFIG_MMU */ 269#else /* CONFIG_MMU */
254 270
255int dma_region_mmap(struct dma_region *dma, struct file *file, struct vm_area_struct *vma) 271int dma_region_mmap(struct dma_region *dma, struct file *file,
272 struct vm_area_struct *vma)
256{ 273{
257 return -EINVAL; 274 return -EINVAL;
258} 275}
259 276
260#endif /* CONFIG_MMU */ 277#endif /* CONFIG_MMU */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-13 13:57:06 -0500