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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/spinlock.h>
30#include <linux/vmalloc.h>
31
32#include <asm/byteorder.h>
33
34#include "core.h"
35
36
37
38
39
40int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
41 int page_count, enum dma_data_direction direction)
42{
43 int i, j;
44 dma_addr_t address;
45
46 buffer->page_count = page_count;
47 buffer->direction = direction;
48
49 buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
50 GFP_KERNEL);
51 if (buffer->pages == NULL)
52 goto out;
53
54 for (i = 0; i < buffer->page_count; i++) {
55 buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
56 if (buffer->pages[i] == NULL)
57 goto out_pages;
58
59 address = dma_map_page(card->device, buffer->pages[i],
60 0, PAGE_SIZE, direction);
61 if (dma_mapping_error(card->device, address)) {
62 __free_page(buffer->pages[i]);
63 goto out_pages;
64 }
65 set_page_private(buffer->pages[i], address);
66 }
67
68 return 0;
69
70 out_pages:
71 for (j = 0; j < i; j++) {
72 address = page_private(buffer->pages[j]);
73 dma_unmap_page(card->device, address,
74 PAGE_SIZE, direction);
75 __free_page(buffer->pages[j]);
76 }
77 kfree(buffer->pages);
78 out:
79 buffer->pages = NULL;
80
81 return -ENOMEM;
82}
83EXPORT_SYMBOL(fw_iso_buffer_init);
84
85int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
86{
87 unsigned long uaddr;
88 int i, err;
89
90 uaddr = vma->vm_start;
91 for (i = 0; i < buffer->page_count; i++) {
92 err = vm_insert_page(vma, uaddr, buffer->pages[i]);
93 if (err)
94 return err;
95
96 uaddr += PAGE_SIZE;
97 }
98
99 return 0;
100}
101
102void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
103 struct fw_card *card)
104{
105 int i;
106 dma_addr_t address;
107
108 for (i = 0; i < buffer->page_count; i++) {
109 address = page_private(buffer->pages[i]);
110 dma_unmap_page(card->device, address,
111 PAGE_SIZE, buffer->direction);
112 __free_page(buffer->pages[i]);
113 }
114
115 kfree(buffer->pages);
116 buffer->pages = NULL;
117}
118EXPORT_SYMBOL(fw_iso_buffer_destroy);
119
120struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
121 int type, int channel, int speed, size_t header_size,
122 fw_iso_callback_t callback, void *callback_data)
123{
124 struct fw_iso_context *ctx;
125
126 ctx = card->driver->allocate_iso_context(card,
127 type, channel, header_size);
128 if (IS_ERR(ctx))
129 return ctx;
130
131 ctx->card = card;
132 ctx->type = type;
133 ctx->channel = channel;
134 ctx->speed = speed;
135 ctx->header_size = header_size;
136 ctx->callback = callback;
137 ctx->callback_data = callback_data;
138
139 return ctx;
140}
141EXPORT_SYMBOL(fw_iso_context_create);
142
143void fw_iso_context_destroy(struct fw_iso_context *ctx)
144{
145 struct fw_card *card = ctx->card;
146
147 card->driver->free_iso_context(ctx);
148}
149EXPORT_SYMBOL(fw_iso_context_destroy);
150
151int fw_iso_context_start(struct fw_iso_context *ctx,
152 int cycle, int sync, int tags)
153{
154 return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
155}
156EXPORT_SYMBOL(fw_iso_context_start);
157
158int fw_iso_context_queue(struct fw_iso_context *ctx,
159 struct fw_iso_packet *packet,
160 struct fw_iso_buffer *buffer,
161 unsigned long payload)
162{
163 struct fw_card *card = ctx->card;
164
165 return card->driver->queue_iso(ctx, packet, buffer, payload);
166}
167EXPORT_SYMBOL(fw_iso_context_queue);
168
169int fw_iso_context_stop(struct fw_iso_context *ctx)
170{
171 return ctx->card->driver->stop_iso(ctx);
172}
173EXPORT_SYMBOL(fw_iso_context_stop);
174
175
176
177
178
179static int manage_bandwidth(struct fw_card *card, int irm_id, int generation,
180 int bandwidth, bool allocate, __be32 data[2])
181{
182 int try, new, old = allocate ? BANDWIDTH_AVAILABLE_INITIAL : 0;
183
184
185
186
187
188
189 for (try = 0; try < 5; try++) {
190 new = allocate ? old - bandwidth : old + bandwidth;
191 if (new < 0 || new > BANDWIDTH_AVAILABLE_INITIAL)
192 break;
193
194 data[0] = cpu_to_be32(old);
195 data[1] = cpu_to_be32(new);
196 switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
197 irm_id, generation, SCODE_100,
198 CSR_REGISTER_BASE + CSR_BANDWIDTH_AVAILABLE,
199 data, 8)) {
200 case RCODE_GENERATION:
201
202 return allocate ? -EAGAIN : bandwidth;
203
204 case RCODE_COMPLETE:
205 if (be32_to_cpup(data) == old)
206 return bandwidth;
207
208 old = be32_to_cpup(data);
209
210 }
211 }
212
213 return -EIO;
214}
215
216static int manage_channel(struct fw_card *card, int irm_id, int generation,
217 u32 channels_mask, u64 offset, bool allocate, __be32 data[2])
218{
219 __be32 c, all, old;
220 int i, retry = 5;
221
222 old = all = allocate ? cpu_to_be32(~0) : 0;
223
224 for (i = 0; i < 32; i++) {
225 if (!(channels_mask & 1 << i))
226 continue;
227
228 c = cpu_to_be32(1 << (31 - i));
229 if ((old & c) != (all & c))
230 continue;
231
232 data[0] = old;
233 data[1] = old ^ c;
234 switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
235 irm_id, generation, SCODE_100,
236 offset, data, 8)) {
237 case RCODE_GENERATION:
238
239 return allocate ? -EAGAIN : i;
240
241 case RCODE_COMPLETE:
242 if (data[0] == old)
243 return i;
244
245 old = data[0];
246
247
248 if ((data[0] & c) == (data[1] & c))
249 continue;
250
251
252 default:
253 if (retry--)
254 i--;
255 }
256 }
257
258 return -EIO;
259}
260
261static void deallocate_channel(struct fw_card *card, int irm_id,
262 int generation, int channel, __be32 buffer[2])
263{
264 u32 mask;
265 u64 offset;
266
267 mask = channel < 32 ? 1 << channel : 1 << (channel - 32);
268 offset = channel < 32 ? CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI :
269 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO;
270
271 manage_channel(card, irm_id, generation, mask, offset, false, buffer);
272}
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298void fw_iso_resource_manage(struct fw_card *card, int generation,
299 u64 channels_mask, int *channel, int *bandwidth,
300 bool allocate, __be32 buffer[2])
301{
302 u32 channels_hi = channels_mask;
303 u32 channels_lo = channels_mask >> 32;
304 int irm_id, ret, c = -EINVAL;
305
306 spin_lock_irq(&card->lock);
307 irm_id = card->irm_node->node_id;
308 spin_unlock_irq(&card->lock);
309
310 if (channels_hi)
311 c = manage_channel(card, irm_id, generation, channels_hi,
312 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI,
313 allocate, buffer);
314 if (channels_lo && c < 0) {
315 c = manage_channel(card, irm_id, generation, channels_lo,
316 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO,
317 allocate, buffer);
318 if (c >= 0)
319 c += 32;
320 }
321 *channel = c;
322
323 if (allocate && channels_mask != 0 && c < 0)
324 *bandwidth = 0;
325
326 if (*bandwidth == 0)
327 return;
328
329 ret = manage_bandwidth(card, irm_id, generation, *bandwidth,
330 allocate, buffer);
331 if (ret < 0)
332 *bandwidth = 0;
333
334 if (allocate && ret < 0 && c >= 0) {
335 deallocate_channel(card, irm_id, generation, c, buffer);
336 *channel = ret;
337 }
338}
339