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23#include <linux/dma-mapping.h>
24#include <linux/errno.h>
25#include <linux/firewire.h>
26#include <linux/firewire-constants.h>
27#include <linux/kernel.h>
28#include <linux/mm.h>
29#include <linux/slab.h>
30#include <linux/spinlock.h>
31#include <linux/vmalloc.h>
32
33#include <asm/byteorder.h>
34
35#include "core.h"
36
37
38
39
40
41int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
42 int page_count, enum dma_data_direction direction)
43{
44 int i, j;
45 dma_addr_t address;
46
47 buffer->page_count = page_count;
48 buffer->direction = direction;
49
50 buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
51 GFP_KERNEL);
52 if (buffer->pages == NULL)
53 goto out;
54
55 for (i = 0; i < buffer->page_count; i++) {
56 buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
57 if (buffer->pages[i] == NULL)
58 goto out_pages;
59
60 address = dma_map_page(card->device, buffer->pages[i],
61 0, PAGE_SIZE, direction);
62 if (dma_mapping_error(card->device, address)) {
63 __free_page(buffer->pages[i]);
64 goto out_pages;
65 }
66 set_page_private(buffer->pages[i], address);
67 }
68
69 return 0;
70
71 out_pages:
72 for (j = 0; j < i; j++) {
73 address = page_private(buffer->pages[j]);
74 dma_unmap_page(card->device, address,
75 PAGE_SIZE, direction);
76 __free_page(buffer->pages[j]);
77 }
78 kfree(buffer->pages);
79 out:
80 buffer->pages = NULL;
81
82 return -ENOMEM;
83}
84EXPORT_SYMBOL(fw_iso_buffer_init);
85
86int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
87{
88 unsigned long uaddr;
89 int i, err;
90
91 uaddr = vma->vm_start;
92 for (i = 0; i < buffer->page_count; i++) {
93 err = vm_insert_page(vma, uaddr, buffer->pages[i]);
94 if (err)
95 return err;
96
97 uaddr += PAGE_SIZE;
98 }
99
100 return 0;
101}
102
103void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
104 struct fw_card *card)
105{
106 int i;
107 dma_addr_t address;
108
109 for (i = 0; i < buffer->page_count; i++) {
110 address = page_private(buffer->pages[i]);
111 dma_unmap_page(card->device, address,
112 PAGE_SIZE, buffer->direction);
113 __free_page(buffer->pages[i]);
114 }
115
116 kfree(buffer->pages);
117 buffer->pages = NULL;
118}
119EXPORT_SYMBOL(fw_iso_buffer_destroy);
120
121
122size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed)
123{
124 int i;
125 dma_addr_t address;
126 ssize_t offset;
127
128 for (i = 0; i < buffer->page_count; i++) {
129 address = page_private(buffer->pages[i]);
130 offset = (ssize_t)completed - (ssize_t)address;
131 if (offset > 0 && offset <= PAGE_SIZE)
132 return (i << PAGE_SHIFT) + offset;
133 }
134
135 return 0;
136}
137
138struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
139 int type, int channel, int speed, size_t header_size,
140 fw_iso_callback_t callback, void *callback_data)
141{
142 struct fw_iso_context *ctx;
143
144 ctx = card->driver->allocate_iso_context(card,
145 type, channel, header_size);
146 if (IS_ERR(ctx))
147 return ctx;
148
149 ctx->card = card;
150 ctx->type = type;
151 ctx->channel = channel;
152 ctx->speed = speed;
153 ctx->header_size = header_size;
154 ctx->callback.sc = callback;
155 ctx->callback_data = callback_data;
156
157 return ctx;
158}
159EXPORT_SYMBOL(fw_iso_context_create);
160
161void fw_iso_context_destroy(struct fw_iso_context *ctx)
162{
163 ctx->card->driver->free_iso_context(ctx);
164}
165EXPORT_SYMBOL(fw_iso_context_destroy);
166
167int fw_iso_context_start(struct fw_iso_context *ctx,
168 int cycle, int sync, int tags)
169{
170 return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
171}
172EXPORT_SYMBOL(fw_iso_context_start);
173
174int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels)
175{
176 return ctx->card->driver->set_iso_channels(ctx, channels);
177}
178
179int fw_iso_context_queue(struct fw_iso_context *ctx,
180 struct fw_iso_packet *packet,
181 struct fw_iso_buffer *buffer,
182 unsigned long payload)
183{
184 return ctx->card->driver->queue_iso(ctx, packet, buffer, payload);
185}
186EXPORT_SYMBOL(fw_iso_context_queue);
187
188int fw_iso_context_stop(struct fw_iso_context *ctx)
189{
190 return ctx->card->driver->stop_iso(ctx);
191}
192EXPORT_SYMBOL(fw_iso_context_stop);
193
194
195
196
197
198static int manage_bandwidth(struct fw_card *card, int irm_id, int generation,
199 int bandwidth, bool allocate, __be32 data[2])
200{
201 int try, new, old = allocate ? BANDWIDTH_AVAILABLE_INITIAL : 0;
202
203
204
205
206
207
208 for (try = 0; try < 5; try++) {
209 new = allocate ? old - bandwidth : old + bandwidth;
210 if (new < 0 || new > BANDWIDTH_AVAILABLE_INITIAL)
211 return -EBUSY;
212
213 data[0] = cpu_to_be32(old);
214 data[1] = cpu_to_be32(new);
215 switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
216 irm_id, generation, SCODE_100,
217 CSR_REGISTER_BASE + CSR_BANDWIDTH_AVAILABLE,
218 data, 8)) {
219 case RCODE_GENERATION:
220
221 return allocate ? -EAGAIN : bandwidth;
222
223 case RCODE_COMPLETE:
224 if (be32_to_cpup(data) == old)
225 return bandwidth;
226
227 old = be32_to_cpup(data);
228
229 }
230 }
231
232 return -EIO;
233}
234
235static int manage_channel(struct fw_card *card, int irm_id, int generation,
236 u32 channels_mask, u64 offset, bool allocate, __be32 data[2])
237{
238 __be32 c, all, old;
239 int i, ret = -EIO, retry = 5;
240
241 old = all = allocate ? cpu_to_be32(~0) : 0;
242
243 for (i = 0; i < 32; i++) {
244 if (!(channels_mask & 1 << i))
245 continue;
246
247 ret = -EBUSY;
248
249 c = cpu_to_be32(1 << (31 - i));
250 if ((old & c) != (all & c))
251 continue;
252
253 data[0] = old;
254 data[1] = old ^ c;
255 switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
256 irm_id, generation, SCODE_100,
257 offset, data, 8)) {
258 case RCODE_GENERATION:
259
260 return allocate ? -EAGAIN : i;
261
262 case RCODE_COMPLETE:
263 if (data[0] == old)
264 return i;
265
266 old = data[0];
267
268
269 if ((data[0] & c) == (data[1] & c))
270 continue;
271
272
273 default:
274 if (retry) {
275 retry--;
276 i--;
277 } else {
278 ret = -EIO;
279 }
280 }
281 }
282
283 return ret;
284}
285
286static void deallocate_channel(struct fw_card *card, int irm_id,
287 int generation, int channel, __be32 buffer[2])
288{
289 u32 mask;
290 u64 offset;
291
292 mask = channel < 32 ? 1 << channel : 1 << (channel - 32);
293 offset = channel < 32 ? CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI :
294 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO;
295
296 manage_channel(card, irm_id, generation, mask, offset, false, buffer);
297}
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323void fw_iso_resource_manage(struct fw_card *card, int generation,
324 u64 channels_mask, int *channel, int *bandwidth,
325 bool allocate, __be32 buffer[2])
326{
327 u32 channels_hi = channels_mask;
328 u32 channels_lo = channels_mask >> 32;
329 int irm_id, ret, c = -EINVAL;
330
331 spin_lock_irq(&card->lock);
332 irm_id = card->irm_node->node_id;
333 spin_unlock_irq(&card->lock);
334
335 if (channels_hi)
336 c = manage_channel(card, irm_id, generation, channels_hi,
337 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI,
338 allocate, buffer);
339 if (channels_lo && c < 0) {
340 c = manage_channel(card, irm_id, generation, channels_lo,
341 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO,
342 allocate, buffer);
343 if (c >= 0)
344 c += 32;
345 }
346 *channel = c;
347
348 if (allocate && channels_mask != 0 && c < 0)
349 *bandwidth = 0;
350
351 if (*bandwidth == 0)
352 return;
353
354 ret = manage_bandwidth(card, irm_id, generation, *bandwidth,
355 allocate, buffer);
356 if (ret < 0)
357 *bandwidth = 0;
358
359 if (allocate && ret < 0) {
360 if (c >= 0)
361 deallocate_channel(card, irm_id, generation, c, buffer);
362 *channel = ret;
363 }
364}
365