blob: 8382e27e9a271877c98d24ff6268f9d578738b47 [file] [log] [blame]
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001/*
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +01002 * Isochronous I/O functionality:
3 * - Isochronous DMA context management
4 * - Isochronous bus resource management (channels, bandwidth), client side
Kristian Høgsberg3038e352006-12-19 19:58:27 -05005 *
Kristian Høgsberg3038e352006-12-19 19:58:27 -05006 * Copyright (C) 2006 Kristian Hoegsberg <krh@bitplanet.net>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 */
22
Kristian Høgsberg3038e352006-12-19 19:58:27 -050023#include <linux/dma-mapping.h>
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +010024#include <linux/errno.h>
Stefan Richter77c9a5d2009-06-05 16:26:18 +020025#include <linux/firewire.h>
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +010026#include <linux/firewire-constants.h>
27#include <linux/kernel.h>
Kristian Høgsberg3038e352006-12-19 19:58:27 -050028#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/slab.h>
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +010030#include <linux/spinlock.h>
31#include <linux/vmalloc.h>
Paul Gortmaker823467e2011-07-10 12:16:32 -040032#include <linux/export.h>
Kristian Høgsberg3038e352006-12-19 19:58:27 -050033
Stefan Richtere8ca9702009-06-04 21:09:38 +020034#include <asm/byteorder.h>
35
Stefan Richter77c9a5d2009-06-05 16:26:18 +020036#include "core.h"
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +010037
38/*
39 * Isochronous DMA context management
40 */
Kristian Høgsberg3038e352006-12-19 19:58:27 -050041
Stefan Richter0b6c4852012-04-09 20:51:18 +020042int fw_iso_buffer_alloc(struct fw_iso_buffer *buffer, int page_count)
Kristian Høgsberg3038e352006-12-19 19:58:27 -050043{
Stefan Richter0b6c4852012-04-09 20:51:18 +020044 int i;
Kristian Høgsberg3038e352006-12-19 19:58:27 -050045
Stefan Richter0b6c4852012-04-09 20:51:18 +020046 buffer->page_count = 0;
47 buffer->page_count_mapped = 0;
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050048 buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
49 GFP_KERNEL);
50 if (buffer->pages == NULL)
Stefan Richter0b6c4852012-04-09 20:51:18 +020051 return -ENOMEM;
Kristian Høgsberg3038e352006-12-19 19:58:27 -050052
Stefan Richter0b6c4852012-04-09 20:51:18 +020053 for (i = 0; i < page_count; i++) {
Kristian Høgsberg68be3fa2007-02-16 17:34:48 -050054 buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050055 if (buffer->pages[i] == NULL)
Stefan Richter0b6c4852012-04-09 20:51:18 +020056 break;
57 }
58 buffer->page_count = i;
59 if (i < page_count) {
60 fw_iso_buffer_destroy(buffer, NULL);
61 return -ENOMEM;
Kristian Høgsberg3038e352006-12-19 19:58:27 -050062 }
63
64 return 0;
Stefan Richter0b6c4852012-04-09 20:51:18 +020065}
Kristian Høgsberg82eff9d2007-02-06 14:49:40 -050066
Stefan Richter0b6c4852012-04-09 20:51:18 +020067int fw_iso_buffer_map_dma(struct fw_iso_buffer *buffer, struct fw_card *card,
68 enum dma_data_direction direction)
69{
70 dma_addr_t address;
71 int i;
72
73 buffer->direction = direction;
74
75 for (i = 0; i < buffer->page_count; i++) {
76 address = dma_map_page(card->device, buffer->pages[i],
77 0, PAGE_SIZE, direction);
78 if (dma_mapping_error(card->device, address))
79 break;
80
81 set_page_private(buffer->pages[i], address);
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050082 }
Stefan Richter0b6c4852012-04-09 20:51:18 +020083 buffer->page_count_mapped = i;
84 if (i < buffer->page_count)
85 return -ENOMEM;
Stefan Richtere1eff7a2009-02-03 17:55:19 +010086
Stefan Richter0b6c4852012-04-09 20:51:18 +020087 return 0;
88}
89
90int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
91 int page_count, enum dma_data_direction direction)
92{
93 int ret;
94
95 ret = fw_iso_buffer_alloc(buffer, page_count);
96 if (ret < 0)
97 return ret;
98
99 ret = fw_iso_buffer_map_dma(buffer, card, direction);
100 if (ret < 0)
101 fw_iso_buffer_destroy(buffer, card);
102
103 return ret;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500104}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400105EXPORT_SYMBOL(fw_iso_buffer_init);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500106
Stefan Richter0b6c4852012-04-09 20:51:18 +0200107int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
108 struct vm_area_struct *vma)
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500109{
110 unsigned long uaddr;
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100111 int i, err;
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500112
113 uaddr = vma->vm_start;
114 for (i = 0; i < buffer->page_count; i++) {
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100115 err = vm_insert_page(vma, uaddr, buffer->pages[i]);
116 if (err)
117 return err;
118
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500119 uaddr += PAGE_SIZE;
120 }
121
122 return 0;
123}
124
125void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
126 struct fw_card *card)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500127{
128 int i;
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500129 dma_addr_t address;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500130
Stefan Richter0b6c4852012-04-09 20:51:18 +0200131 for (i = 0; i < buffer->page_count_mapped; i++) {
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500132 address = page_private(buffer->pages[i]);
133 dma_unmap_page(card->device, address,
Stefan Richter29ad14c2009-06-15 00:38:50 +0200134 PAGE_SIZE, buffer->direction);
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500135 }
Stefan Richter0b6c4852012-04-09 20:51:18 +0200136 for (i = 0; i < buffer->page_count; i++)
137 __free_page(buffer->pages[i]);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500138
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500139 kfree(buffer->pages);
140 buffer->pages = NULL;
Stefan Richter0b6c4852012-04-09 20:51:18 +0200141 buffer->page_count = 0;
142 buffer->page_count_mapped = 0;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500143}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400144EXPORT_SYMBOL(fw_iso_buffer_destroy);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500145
Stefan Richter872e3302010-07-29 18:19:22 +0200146/* Convert DMA address to offset into virtually contiguous buffer. */
147size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed)
148{
149 int i;
150 dma_addr_t address;
151 ssize_t offset;
152
153 for (i = 0; i < buffer->page_count; i++) {
154 address = page_private(buffer->pages[i]);
155 offset = (ssize_t)completed - (ssize_t)address;
156 if (offset > 0 && offset <= PAGE_SIZE)
157 return (i << PAGE_SHIFT) + offset;
158 }
159
160 return 0;
161}
162
Stefan Richter53dca512008-12-14 21:47:04 +0100163struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
164 int type, int channel, int speed, size_t header_size,
165 fw_iso_callback_t callback, void *callback_data)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500166{
167 struct fw_iso_context *ctx;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500168
Stefan Richter4817ed22008-12-21 16:39:46 +0100169 ctx = card->driver->allocate_iso_context(card,
170 type, channel, header_size);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500171 if (IS_ERR(ctx))
172 return ctx;
173
174 ctx->card = card;
175 ctx->type = type;
Kristian Høgsberg21efb3c2007-02-16 17:34:50 -0500176 ctx->channel = channel;
177 ctx->speed = speed;
Kristian Høgsberg295e3fe2007-02-16 17:34:40 -0500178 ctx->header_size = header_size;
Stefan Richter872e3302010-07-29 18:19:22 +0200179 ctx->callback.sc = callback;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500180 ctx->callback_data = callback_data;
181
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500182 return ctx;
183}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400184EXPORT_SYMBOL(fw_iso_context_create);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500185
186void fw_iso_context_destroy(struct fw_iso_context *ctx)
187{
Stefan Richter872e3302010-07-29 18:19:22 +0200188 ctx->card->driver->free_iso_context(ctx);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500189}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400190EXPORT_SYMBOL(fw_iso_context_destroy);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500191
Stefan Richter53dca512008-12-14 21:47:04 +0100192int fw_iso_context_start(struct fw_iso_context *ctx,
193 int cycle, int sync, int tags)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500194{
Kristian Høgsbergeb0306e2007-03-14 17:34:54 -0400195 return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500196}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400197EXPORT_SYMBOL(fw_iso_context_start);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500198
Stefan Richter872e3302010-07-29 18:19:22 +0200199int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels)
200{
201 return ctx->card->driver->set_iso_channels(ctx, channels);
202}
203
Stefan Richter53dca512008-12-14 21:47:04 +0100204int fw_iso_context_queue(struct fw_iso_context *ctx,
205 struct fw_iso_packet *packet,
206 struct fw_iso_buffer *buffer,
207 unsigned long payload)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500208{
Stefan Richter872e3302010-07-29 18:19:22 +0200209 return ctx->card->driver->queue_iso(ctx, packet, buffer, payload);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500210}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400211EXPORT_SYMBOL(fw_iso_context_queue);
Kristian Høgsbergb8295662007-02-16 17:34:42 -0500212
Clemens Ladisch13882a82011-05-02 09:33:56 +0200213void fw_iso_context_queue_flush(struct fw_iso_context *ctx)
214{
215 ctx->card->driver->flush_queue_iso(ctx);
216}
217EXPORT_SYMBOL(fw_iso_context_queue_flush);
218
Clemens Ladischd1bbd202012-03-18 19:06:39 +0100219int fw_iso_context_flush_completions(struct fw_iso_context *ctx)
220{
221 return ctx->card->driver->flush_iso_completions(ctx);
222}
223EXPORT_SYMBOL(fw_iso_context_flush_completions);
224
Stefan Richter53dca512008-12-14 21:47:04 +0100225int fw_iso_context_stop(struct fw_iso_context *ctx)
Kristian Høgsbergb8295662007-02-16 17:34:42 -0500226{
227 return ctx->card->driver->stop_iso(ctx);
228}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400229EXPORT_SYMBOL(fw_iso_context_stop);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100230
231/*
232 * Isochronous bus resource management (channels, bandwidth), client side
233 */
234
235static int manage_bandwidth(struct fw_card *card, int irm_id, int generation,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200236 int bandwidth, bool allocate)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100237{
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100238 int try, new, old = allocate ? BANDWIDTH_AVAILABLE_INITIAL : 0;
Stefan Richterf30e6d32011-04-22 15:13:54 +0200239 __be32 data[2];
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100240
241 /*
242 * On a 1394a IRM with low contention, try < 1 is enough.
243 * On a 1394-1995 IRM, we need at least try < 2.
244 * Let's just do try < 5.
245 */
246 for (try = 0; try < 5; try++) {
247 new = allocate ? old - bandwidth : old + bandwidth;
248 if (new < 0 || new > BANDWIDTH_AVAILABLE_INITIAL)
Clemens Ladischd6372b62010-04-12 10:35:18 +0200249 return -EBUSY;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100250
251 data[0] = cpu_to_be32(old);
252 data[1] = cpu_to_be32(new);
253 switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
254 irm_id, generation, SCODE_100,
255 CSR_REGISTER_BASE + CSR_BANDWIDTH_AVAILABLE,
Stefan Richter1821bc12009-09-05 13:23:49 +0200256 data, 8)) {
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100257 case RCODE_GENERATION:
258 /* A generation change frees all bandwidth. */
259 return allocate ? -EAGAIN : bandwidth;
260
261 case RCODE_COMPLETE:
262 if (be32_to_cpup(data) == old)
263 return bandwidth;
264
265 old = be32_to_cpup(data);
266 /* Fall through. */
267 }
268 }
269
270 return -EIO;
271}
272
273static int manage_channel(struct fw_card *card, int irm_id, int generation,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200274 u32 channels_mask, u64 offset, bool allocate)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100275{
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100276 __be32 bit, all, old;
Stefan Richterf30e6d32011-04-22 15:13:54 +0200277 __be32 data[2];
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100278 int channel, ret = -EIO, retry = 5;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100279
Stefan Richter5d9cb7d272009-01-08 23:07:40 +0100280 old = all = allocate ? cpu_to_be32(~0) : 0;
281
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100282 for (channel = 0; channel < 32; channel++) {
283 if (!(channels_mask & 1 << channel))
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100284 continue;
285
Clemens Ladischd6372b62010-04-12 10:35:18 +0200286 ret = -EBUSY;
287
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100288 bit = cpu_to_be32(1 << (31 - channel));
289 if ((old & bit) != (all & bit))
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100290 continue;
291
292 data[0] = old;
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100293 data[1] = old ^ bit;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100294 switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
295 irm_id, generation, SCODE_100,
Stefan Richter1821bc12009-09-05 13:23:49 +0200296 offset, data, 8)) {
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100297 case RCODE_GENERATION:
298 /* A generation change frees all channels. */
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100299 return allocate ? -EAGAIN : channel;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100300
301 case RCODE_COMPLETE:
302 if (data[0] == old)
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100303 return channel;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100304
305 old = data[0];
306
307 /* Is the IRM 1394a-2000 compliant? */
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100308 if ((data[0] & bit) == (data[1] & bit))
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100309 continue;
310
311 /* 1394-1995 IRM, fall through to retry. */
312 default:
Clemens Ladisch3a1f0a02010-04-12 10:35:05 +0200313 if (retry) {
314 retry--;
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100315 channel--;
Clemens Ladischd6372b62010-04-12 10:35:18 +0200316 } else {
317 ret = -EIO;
Clemens Ladisch3a1f0a02010-04-12 10:35:05 +0200318 }
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100319 }
320 }
321
Clemens Ladischd6372b62010-04-12 10:35:18 +0200322 return ret;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100323}
324
325static void deallocate_channel(struct fw_card *card, int irm_id,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200326 int generation, int channel)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100327{
Stefan Richter5d9cb7d272009-01-08 23:07:40 +0100328 u32 mask;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100329 u64 offset;
330
Stefan Richter5d9cb7d272009-01-08 23:07:40 +0100331 mask = channel < 32 ? 1 << channel : 1 << (channel - 32);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100332 offset = channel < 32 ? CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI :
333 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO;
334
Stefan Richterf30e6d32011-04-22 15:13:54 +0200335 manage_channel(card, irm_id, generation, mask, offset, false);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100336}
337
338/**
Stefan Richter656b7af2010-07-07 13:26:18 +0200339 * fw_iso_resource_manage() - Allocate or deallocate a channel and/or bandwidth
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100340 *
341 * In parameters: card, generation, channels_mask, bandwidth, allocate
342 * Out parameters: channel, bandwidth
343 * This function blocks (sleeps) during communication with the IRM.
Stefan Richter5d9cb7d272009-01-08 23:07:40 +0100344 *
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100345 * Allocates or deallocates at most one channel out of channels_mask.
Stefan Richter5d9cb7d272009-01-08 23:07:40 +0100346 * channels_mask is a bitfield with MSB for channel 63 and LSB for channel 0.
347 * (Note, the IRM's CHANNELS_AVAILABLE is a big-endian bitfield with MSB for
348 * channel 0 and LSB for channel 63.)
349 * Allocates or deallocates as many bandwidth allocation units as specified.
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100350 *
351 * Returns channel < 0 if no channel was allocated or deallocated.
352 * Returns bandwidth = 0 if no bandwidth was allocated or deallocated.
353 *
354 * If generation is stale, deallocations succeed but allocations fail with
355 * channel = -EAGAIN.
356 *
Stefan Richter5d9cb7d272009-01-08 23:07:40 +0100357 * If channel allocation fails, no bandwidth will be allocated either.
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100358 * If bandwidth allocation fails, no channel will be allocated either.
Stefan Richter5d9cb7d272009-01-08 23:07:40 +0100359 * But deallocations of channel and bandwidth are tried independently
360 * of each other's success.
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100361 */
362void fw_iso_resource_manage(struct fw_card *card, int generation,
363 u64 channels_mask, int *channel, int *bandwidth,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200364 bool allocate)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100365{
Stefan Richter5d9cb7d272009-01-08 23:07:40 +0100366 u32 channels_hi = channels_mask; /* channels 31...0 */
367 u32 channels_lo = channels_mask >> 32; /* channels 63...32 */
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100368 int irm_id, ret, c = -EINVAL;
369
370 spin_lock_irq(&card->lock);
371 irm_id = card->irm_node->node_id;
372 spin_unlock_irq(&card->lock);
373
374 if (channels_hi)
375 c = manage_channel(card, irm_id, generation, channels_hi,
Stefan Richter6fdc0372009-06-20 13:23:59 +0200376 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200377 allocate);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100378 if (channels_lo && c < 0) {
379 c = manage_channel(card, irm_id, generation, channels_lo,
Stefan Richter6fdc0372009-06-20 13:23:59 +0200380 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200381 allocate);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100382 if (c >= 0)
383 c += 32;
384 }
385 *channel = c;
386
Stefan Richter5d9cb7d272009-01-08 23:07:40 +0100387 if (allocate && channels_mask != 0 && c < 0)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100388 *bandwidth = 0;
389
390 if (*bandwidth == 0)
391 return;
392
Stefan Richterf30e6d32011-04-22 15:13:54 +0200393 ret = manage_bandwidth(card, irm_id, generation, *bandwidth, allocate);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100394 if (ret < 0)
395 *bandwidth = 0;
396
Clemens Ladischcf36df62010-03-15 13:20:32 +0100397 if (allocate && ret < 0) {
398 if (c >= 0)
Stefan Richterf30e6d32011-04-22 15:13:54 +0200399 deallocate_channel(card, irm_id, generation, c);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100400 *channel = ret;
401 }
402}
Clemens Ladisch31ef9132011-03-15 07:53:21 +0100403EXPORT_SYMBOL(fw_iso_resource_manage);