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Kristian Høgsbergc781c062007-05-07 20:33:32 -04001/*
2 * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
Kristian Høgsberg3038e352006-12-19 19:58:27 -05003 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
Stefan Richtere8ca9702009-06-04 21:09:38 +020019#include <linux/bug.h>
Stefan Richter459f7922008-05-24 16:50:22 +020020#include <linux/completion.h>
21#include <linux/crc-itu-t.h>
Kristian Høgsberg3038e352006-12-19 19:58:27 -050022#include <linux/device.h>
Stefan Richter459f7922008-05-24 16:50:22 +020023#include <linux/errno.h>
Stefan Richtere8ca9702009-06-04 21:09:38 +020024#include <linux/jiffies.h>
25#include <linux/kernel.h>
Stefan Richter459f7922008-05-24 16:50:22 +020026#include <linux/kref.h>
Stefan Richtere8ca9702009-06-04 21:09:38 +020027#include <linux/list.h>
Stefan Richter459f7922008-05-24 16:50:22 +020028#include <linux/module.h>
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -040029#include <linux/mutex.h>
Stefan Richtere8ca9702009-06-04 21:09:38 +020030#include <linux/spinlock.h>
31#include <linux/timer.h>
32#include <linux/workqueue.h>
Stefan Richter459f7922008-05-24 16:50:22 +020033
Stefan Richtere8ca9702009-06-04 21:09:38 +020034#include <asm/atomic.h>
35#include <asm/byteorder.h>
36
Kristian Høgsberg19a15b92006-12-19 19:58:31 -050037#include "fw-device.h"
Stefan Richtere8ca9702009-06-04 21:09:38 +020038#include "fw-topology.h"
39#include "fw-transaction.h"
Kristian Høgsberg3038e352006-12-19 19:58:27 -050040
Kristian Høgsberge1755692007-05-07 20:33:31 -040041int fw_compute_block_crc(u32 *block)
Kristian Høgsberg3038e352006-12-19 19:58:27 -050042{
Kristian Høgsberge1755692007-05-07 20:33:31 -040043 __be32 be32_block[256];
44 int i, length;
Kristian Høgsberg3038e352006-12-19 19:58:27 -050045
Kristian Høgsberge1755692007-05-07 20:33:31 -040046 length = (*block >> 16) & 0xff;
47 for (i = 0; i < length; i++)
48 be32_block[i] = cpu_to_be32(block[i + 1]);
49 *block |= crc_itu_t(0, (u8 *) be32_block, length * 4);
Kristian Høgsberg3038e352006-12-19 19:58:27 -050050
Kristian Høgsberge1755692007-05-07 20:33:31 -040051 return length;
Kristian Høgsberg3038e352006-12-19 19:58:27 -050052}
53
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -040054static DEFINE_MUTEX(card_mutex);
Kristian Høgsberg3038e352006-12-19 19:58:27 -050055static LIST_HEAD(card_list);
56
57static LIST_HEAD(descriptor_list);
58static int descriptor_count;
59
Kristian Høgsberga77754a2007-05-07 20:33:35 -040060#define BIB_CRC(v) ((v) << 0)
61#define BIB_CRC_LENGTH(v) ((v) << 16)
62#define BIB_INFO_LENGTH(v) ((v) << 24)
Kristian Høgsberg3038e352006-12-19 19:58:27 -050063
Kristian Høgsberga77754a2007-05-07 20:33:35 -040064#define BIB_LINK_SPEED(v) ((v) << 0)
65#define BIB_GENERATION(v) ((v) << 4)
66#define BIB_MAX_ROM(v) ((v) << 8)
67#define BIB_MAX_RECEIVE(v) ((v) << 12)
68#define BIB_CYC_CLK_ACC(v) ((v) << 16)
69#define BIB_PMC ((1) << 27)
70#define BIB_BMC ((1) << 28)
71#define BIB_ISC ((1) << 29)
72#define BIB_CMC ((1) << 30)
73#define BIB_IMC ((1) << 31)
Kristian Høgsberg3038e352006-12-19 19:58:27 -050074
Stefan Richter53dca512008-12-14 21:47:04 +010075static u32 *generate_config_rom(struct fw_card *card, size_t *config_rom_length)
Kristian Høgsberg3038e352006-12-19 19:58:27 -050076{
77 struct fw_descriptor *desc;
78 static u32 config_rom[256];
79 int i, j, length;
80
Kristian Høgsbergc781c062007-05-07 20:33:32 -040081 /*
82 * Initialize contents of config rom buffer. On the OHCI
Stefan Richter5e20c282007-01-21 20:44:09 +010083 * controller, block reads to the config rom accesses the host
84 * memory, but quadlet read access the hardware bus info block
85 * registers. That's just crack, but it means we should make
Jay Fenlason2cc489c2008-10-22 15:59:42 -040086 * sure the contents of bus info block in host memory matches
Kristian Høgsbergc781c062007-05-07 20:33:32 -040087 * the version stored in the OHCI registers.
88 */
Kristian Høgsberg3038e352006-12-19 19:58:27 -050089
Kristian Høgsberg2d826cc2007-05-09 19:23:14 -040090 memset(config_rom, 0, sizeof(config_rom));
Kristian Høgsberga77754a2007-05-07 20:33:35 -040091 config_rom[0] = BIB_CRC_LENGTH(4) | BIB_INFO_LENGTH(4) | BIB_CRC(0);
Kristian Høgsberg3038e352006-12-19 19:58:27 -050092 config_rom[1] = 0x31333934;
93
94 config_rom[2] =
Kristian Høgsberga77754a2007-05-07 20:33:35 -040095 BIB_LINK_SPEED(card->link_speed) |
96 BIB_GENERATION(card->config_rom_generation++ % 14 + 2) |
97 BIB_MAX_ROM(2) |
98 BIB_MAX_RECEIVE(card->max_receive) |
99 BIB_BMC | BIB_ISC | BIB_CMC | BIB_IMC;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500100 config_rom[3] = card->guid >> 32;
101 config_rom[4] = card->guid;
102
103 /* Generate root directory. */
104 i = 5;
105 config_rom[i++] = 0;
106 config_rom[i++] = 0x0c0083c0; /* node capabilities */
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500107 j = i + descriptor_count;
108
109 /* Generate root directory entries for descriptors. */
110 list_for_each_entry (desc, &descriptor_list, link) {
Kristian Høgsberg937f6872007-03-07 12:12:36 -0500111 if (desc->immediate > 0)
112 config_rom[i++] = desc->immediate;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500113 config_rom[i] = desc->key | (j - i);
114 i++;
115 j += desc->length;
116 }
117
118 /* Update root directory length. */
119 config_rom[5] = (i - 5 - 1) << 16;
120
121 /* End of root directory, now copy in descriptors. */
122 list_for_each_entry (desc, &descriptor_list, link) {
123 memcpy(&config_rom[i], desc->data, desc->length * 4);
124 i += desc->length;
125 }
126
127 /* Calculate CRCs for all blocks in the config rom. This
128 * assumes that CRC length and info length are identical for
129 * the bus info block, which is always the case for this
130 * implementation. */
Kristian Høgsberge1755692007-05-07 20:33:31 -0400131 for (i = 0; i < j; i += length + 1)
132 length = fw_compute_block_crc(config_rom + i);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500133
134 *config_rom_length = j;
135
136 return config_rom;
137}
138
Stefan Richter53dca512008-12-14 21:47:04 +0100139static void update_config_roms(void)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500140{
141 struct fw_card *card;
142 u32 *config_rom;
143 size_t length;
144
145 list_for_each_entry (card, &card_list, link) {
146 config_rom = generate_config_rom(card, &length);
147 card->driver->set_config_rom(card, config_rom, length);
148 }
149}
150
Stefan Richter53dca512008-12-14 21:47:04 +0100151int fw_core_add_descriptor(struct fw_descriptor *desc)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500152{
153 size_t i;
154
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400155 /*
156 * Check descriptor is valid; the length of all blocks in the
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500157 * descriptor has to add up to exactly the length of the
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400158 * block.
159 */
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500160 i = 0;
161 while (i < desc->length)
162 i += (desc->data[i] >> 16) + 1;
163
164 if (i != desc->length)
Kristian Høgsberg66dea3e2007-03-28 21:26:42 +0200165 return -EINVAL;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500166
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -0400167 mutex_lock(&card_mutex);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500168
Kristian Høgsberga98e2712007-05-07 20:33:34 -0400169 list_add_tail(&desc->link, &descriptor_list);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500170 descriptor_count++;
Kristian Høgsberg937f6872007-03-07 12:12:36 -0500171 if (desc->immediate > 0)
172 descriptor_count++;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500173 update_config_roms();
174
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -0400175 mutex_unlock(&card_mutex);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500176
177 return 0;
178}
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500179
Stefan Richter53dca512008-12-14 21:47:04 +0100180void fw_core_remove_descriptor(struct fw_descriptor *desc)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500181{
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -0400182 mutex_lock(&card_mutex);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500183
184 list_del(&desc->link);
185 descriptor_count--;
Kristian Høgsberg937f6872007-03-07 12:12:36 -0500186 if (desc->immediate > 0)
187 descriptor_count--;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500188 update_config_roms();
189
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -0400190 mutex_unlock(&card_mutex);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500191}
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500192
Stefan Richter7889b602009-03-10 21:09:28 +0100193static int set_broadcast_channel(struct device *dev, void *data)
Jay Fenlason6104ee92009-02-23 15:59:34 -0500194{
Stefan Richter7889b602009-03-10 21:09:28 +0100195 fw_device_set_broadcast_channel(fw_device(dev), (long)data);
Jay Fenlason6104ee92009-02-23 15:59:34 -0500196 return 0;
197}
198
Stefan Richtercbae7872009-03-10 21:08:37 +0100199static void allocate_broadcast_channel(struct fw_card *card, int generation)
Jay Fenlason6104ee92009-02-23 15:59:34 -0500200{
Stefan Richtercbae7872009-03-10 21:08:37 +0100201 int channel, bandwidth = 0;
Jay Fenlason6104ee92009-02-23 15:59:34 -0500202
Stefan Richtercbae7872009-03-10 21:08:37 +0100203 fw_iso_resource_manage(card, generation, 1ULL << 31,
204 &channel, &bandwidth, true);
205 if (channel == 31) {
Stefan Richter7889b602009-03-10 21:09:28 +0100206 card->broadcast_channel_allocated = true;
207 device_for_each_child(card->device, (void *)(long)generation,
208 set_broadcast_channel);
Jay Fenlason6104ee92009-02-23 15:59:34 -0500209 }
Jay Fenlason6104ee92009-02-23 15:59:34 -0500210}
Jay Fenlason6104ee92009-02-23 15:59:34 -0500211
Kristian Høgsberg83db8012007-01-26 00:37:50 -0500212static const char gap_count_table[] = {
213 63, 5, 7, 8, 10, 13, 16, 18, 21, 24, 26, 29, 32, 35, 37, 40
214};
215
Stefan Richter53dca512008-12-14 21:47:04 +0100216void fw_schedule_bm_work(struct fw_card *card, unsigned long delay)
Jay Fenlason0fa1986f2008-11-29 17:44:57 +0100217{
218 int scheduled;
219
220 fw_card_get(card);
221 scheduled = schedule_delayed_work(&card->work, delay);
222 if (!scheduled)
223 fw_card_put(card);
224}
225
Stefan Richter53dca512008-12-14 21:47:04 +0100226static void fw_card_bm_work(struct work_struct *work)
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500227{
Kristian Høgsberg83db8012007-01-26 00:37:50 -0500228 struct fw_card *card = container_of(work, struct fw_card, work.work);
Stefan Richtercbae7872009-03-10 21:08:37 +0100229 struct fw_device *root_device;
230 struct fw_node *root_node;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500231 unsigned long flags;
Stefan Richtercbae7872009-03-10 21:08:37 +0100232 int root_id, new_root_id, irm_id, local_id;
233 int gap_count, generation, grace, rcode;
Stefan Richter25b1c3d2008-03-24 20:57:12 +0100234 bool do_reset = false;
Stefan Richter62305822009-01-09 20:49:37 +0100235 bool root_device_is_running;
236 bool root_device_is_cmc;
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200237 __be32 lock_data[2];
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500238
239 spin_lock_irqsave(&card->lock, flags);
Stefan Richter15803472008-02-24 18:57:23 +0100240
Stefan Richtercbae7872009-03-10 21:08:37 +0100241 if (card->local_node == NULL) {
Stefan Richter15803472008-02-24 18:57:23 +0100242 spin_unlock_irqrestore(&card->lock, flags);
Jay Fenlason0fa1986f2008-11-29 17:44:57 +0100243 goto out_put_card;
Stefan Richter15803472008-02-24 18:57:23 +0100244 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500245
246 generation = card->generation;
Stefan Richtercbae7872009-03-10 21:08:37 +0100247 root_node = card->root_node;
248 fw_node_get(root_node);
Stefan Richter15803472008-02-24 18:57:23 +0100249 root_device = root_node->data;
Stefan Richter62305822009-01-09 20:49:37 +0100250 root_device_is_running = root_device &&
251 atomic_read(&root_device->state) == FW_DEVICE_RUNNING;
252 root_device_is_cmc = root_device && root_device->cmc;
Stefan Richtercbae7872009-03-10 21:08:37 +0100253 root_id = root_node->node_id;
254 irm_id = card->irm_node->node_id;
255 local_id = card->local_node->node_id;
Stefan Richtere1dc7ca2009-03-10 21:07:46 +0100256
257 grace = time_after(jiffies, card->reset_jiffies + DIV_ROUND_UP(HZ, 8));
258
Stefan Richter8cd0bbb2008-03-24 20:56:40 +0100259 if (is_next_generation(generation, card->bm_generation) ||
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500260 (card->bm_generation != generation && grace)) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400261 /*
262 * This first step is to figure out who is IRM and
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500263 * then try to become bus manager. If the IRM is not
264 * well defined (e.g. does not have an active link
265 * layer or does not responds to our lock request, we
266 * will have to do a little vigilante bus management.
267 * In that case, we do a goto into the gap count logic
268 * so that when we do the reset, we still optimize the
269 * gap count. That could well save a reset in the
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400270 * next generation.
271 */
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500272
Stefan Richtercbae7872009-03-10 21:08:37 +0100273 if (!card->irm_node->link_on) {
274 new_root_id = local_id;
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500275 fw_notify("IRM has link off, making local node (%02x) root.\n",
276 new_root_id);
277 goto pick_me;
278 }
279
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200280 lock_data[0] = cpu_to_be32(0x3f);
Stefan Richtercbae7872009-03-10 21:08:37 +0100281 lock_data[1] = cpu_to_be32(local_id);
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500282
283 spin_unlock_irqrestore(&card->lock, flags);
284
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200285 rcode = fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
286 irm_id, generation, SCODE_100,
287 CSR_REGISTER_BASE + CSR_BUS_MANAGER_ID,
288 lock_data, sizeof(lock_data));
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500289
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200290 if (rcode == RCODE_GENERATION)
291 /* Another bus reset, BM work has been rescheduled. */
Stefan Richter15803472008-02-24 18:57:23 +0100292 goto out;
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500293
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200294 if (rcode == RCODE_COMPLETE &&
Jay Fenlason6104ee92009-02-23 15:59:34 -0500295 lock_data[0] != cpu_to_be32(0x3f)) {
Stefan Richtercbae7872009-03-10 21:08:37 +0100296
297 /* Somebody else is BM. Only act as IRM. */
298 if (local_id == irm_id)
299 allocate_broadcast_channel(card, generation);
300
Stefan Richter15803472008-02-24 18:57:23 +0100301 goto out;
Jay Fenlason6104ee92009-02-23 15:59:34 -0500302 }
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500303
304 spin_lock_irqsave(&card->lock, flags);
Jay Fenlason1e119fa2008-07-20 14:20:53 +0200305
306 if (rcode != RCODE_COMPLETE) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400307 /*
308 * The lock request failed, maybe the IRM
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500309 * isn't really IRM capable after all. Let's
310 * do a bus reset and pick the local node as
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400311 * root, and thus, IRM.
312 */
Stefan Richtercbae7872009-03-10 21:08:37 +0100313 new_root_id = local_id;
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500314 fw_notify("BM lock failed, making local node (%02x) root.\n",
315 new_root_id);
316 goto pick_me;
317 }
318 } else if (card->bm_generation != generation) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400319 /*
Stefan Richtere1dc7ca2009-03-10 21:07:46 +0100320 * We weren't BM in the last generation, and the last
321 * bus reset is less than 125ms ago. Reschedule this job.
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400322 */
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500323 spin_unlock_irqrestore(&card->lock, flags);
Stefan Richtere1dc7ca2009-03-10 21:07:46 +0100324 fw_schedule_bm_work(card, DIV_ROUND_UP(HZ, 8));
Stefan Richter15803472008-02-24 18:57:23 +0100325 goto out;
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500326 }
327
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400328 /*
329 * We're bus manager for this generation, so next step is to
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500330 * make sure we have an active cycle master and do gap count
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400331 * optimization.
332 */
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500333 card->bm_generation = generation;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500334
Stefan Richter15803472008-02-24 18:57:23 +0100335 if (root_device == NULL) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400336 /*
337 * Either link_on is false, or we failed to read the
338 * config rom. In either case, pick another root.
339 */
Stefan Richtercbae7872009-03-10 21:08:37 +0100340 new_root_id = local_id;
Stefan Richter62305822009-01-09 20:49:37 +0100341 } else if (!root_device_is_running) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400342 /*
343 * If we haven't probed this device yet, bail out now
344 * and let's try again once that's done.
345 */
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500346 spin_unlock_irqrestore(&card->lock, flags);
Stefan Richter15803472008-02-24 18:57:23 +0100347 goto out;
Stefan Richter62305822009-01-09 20:49:37 +0100348 } else if (root_device_is_cmc) {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400349 /*
350 * FIXME: I suppose we should set the cmstr bit in the
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500351 * STATE_CLEAR register of this node, as described in
352 * 1394-1995, 8.4.2.6. Also, send out a force root
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400353 * packet for this node.
354 */
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500355 new_root_id = root_id;
Kristian Høgsberg83db8012007-01-26 00:37:50 -0500356 } else {
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400357 /*
358 * Current root has an active link layer and we
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500359 * successfully read the config rom, but it's not
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400360 * cycle master capable.
361 */
Stefan Richtercbae7872009-03-10 21:08:37 +0100362 new_root_id = local_id;
Kristian Høgsberg83db8012007-01-26 00:37:50 -0500363 }
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500364
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500365 pick_me:
Stefan Richter24d40122007-06-18 19:44:12 +0200366 /*
367 * Pick a gap count from 1394a table E-1. The table doesn't cover
368 * the typically much larger 1394b beta repeater delays though.
369 */
370 if (!card->beta_repeaters_present &&
Stefan Richter15803472008-02-24 18:57:23 +0100371 root_node->max_hops < ARRAY_SIZE(gap_count_table))
372 gap_count = gap_count_table[root_node->max_hops];
Kristian Høgsberg83db8012007-01-26 00:37:50 -0500373 else
374 gap_count = 63;
375
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400376 /*
Stefan Richter25b1c3d2008-03-24 20:57:12 +0100377 * Finally, figure out if we should do a reset or not. If we have
378 * done less than 5 resets with the same physical topology and we
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400379 * have either a new root or a new gap count setting, let's do it.
380 */
Kristian Høgsberg83db8012007-01-26 00:37:50 -0500381
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500382 if (card->bm_retries++ < 5 &&
383 (card->gap_count != gap_count || new_root_id != root_id))
Stefan Richter25b1c3d2008-03-24 20:57:12 +0100384 do_reset = true;
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500385
386 spin_unlock_irqrestore(&card->lock, flags);
387
Kristian Høgsberg83db8012007-01-26 00:37:50 -0500388 if (do_reset) {
389 fw_notify("phy config: card %d, new root=%x, gap_count=%d\n",
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500390 card->index, new_root_id, gap_count);
391 fw_send_phy_config(card, new_root_id, generation, gap_count);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500392 fw_core_initiate_bus_reset(card, 1);
Stefan Richtercbae7872009-03-10 21:08:37 +0100393 /* Will allocate broadcast channel after the reset. */
394 } else {
395 if (local_id == irm_id)
396 allocate_broadcast_channel(card, generation);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500397 }
Jay Fenlason6104ee92009-02-23 15:59:34 -0500398
Stefan Richter15803472008-02-24 18:57:23 +0100399 out:
Stefan Richter15803472008-02-24 18:57:23 +0100400 fw_node_put(root_node);
Jay Fenlason0fa1986f2008-11-29 17:44:57 +0100401 out_put_card:
402 fw_card_put(card);
Kristian Høgsberg19a15b92006-12-19 19:58:31 -0500403}
404
Stefan Richter53dca512008-12-14 21:47:04 +0100405static void flush_timer_callback(unsigned long data)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500406{
407 struct fw_card *card = (struct fw_card *)data;
408
409 fw_flush_transactions(card);
410}
411
Stefan Richter53dca512008-12-14 21:47:04 +0100412void fw_card_initialize(struct fw_card *card,
413 const struct fw_card_driver *driver,
414 struct device *device)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500415{
Kristian Høgsbergbbf19db2007-02-06 14:49:38 -0500416 static atomic_t index = ATOMIC_INIT(-1);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500417
Kristian Høgsbergbbf19db2007-02-06 14:49:38 -0500418 card->index = atomic_inc_return(&index);
Stefan Richter5e20c282007-01-21 20:44:09 +0100419 card->driver = driver;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500420 card->device = device;
Stefan Richter5e20c282007-01-21 20:44:09 +0100421 card->current_tlabel = 0;
422 card->tlabel_mask = 0;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500423 card->color = 0;
Stefan Richtere534fe12008-05-24 16:41:09 +0200424 card->broadcast_channel = BROADCAST_CHANNEL_INITIAL;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500425
Stefan Richter459f7922008-05-24 16:50:22 +0200426 kref_init(&card->kref);
427 init_completion(&card->done);
Stefan Richter5e20c282007-01-21 20:44:09 +0100428 INIT_LIST_HEAD(&card->transaction_list);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500429 spin_lock_init(&card->lock);
430 setup_timer(&card->flush_timer,
431 flush_timer_callback, (unsigned long)card);
432
433 card->local_node = NULL;
434
Kristian Høgsberg931c4832007-01-26 00:38:45 -0500435 INIT_DELAYED_WORK(&card->work, fw_card_bm_work);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500436}
437EXPORT_SYMBOL(fw_card_initialize);
438
Stefan Richter53dca512008-12-14 21:47:04 +0100439int fw_card_add(struct fw_card *card,
440 u32 max_receive, u32 link_speed, u64 guid)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500441{
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500442 u32 *config_rom;
443 size_t length;
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100444 int ret;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500445
446 card->max_receive = max_receive;
447 card->link_speed = link_speed;
448 card->guid = guid;
449
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -0400450 mutex_lock(&card_mutex);
Kristian Høgsberga98e2712007-05-07 20:33:34 -0400451 config_rom = generate_config_rom(card, &length);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500452 list_add_tail(&card->link, &card_list);
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -0400453 mutex_unlock(&card_mutex);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500454
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100455 ret = card->driver->enable(card, config_rom, length);
456 if (ret < 0) {
Petr Vandrovecb7479fe2009-02-01 01:29:35 -0800457 mutex_lock(&card_mutex);
458 list_del(&card->link);
459 mutex_unlock(&card_mutex);
460 }
Stefan Richtere1eff7a2009-02-03 17:55:19 +0100461
462 return ret;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500463}
464EXPORT_SYMBOL(fw_card_add);
465
466
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400467/*
468 * The next few functions implements a dummy driver that use once a
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500469 * card driver shuts down an fw_card. This allows the driver to
470 * cleanly unload, as all IO to the card will be handled by the dummy
471 * driver instead of calling into the (possibly) unloaded module. The
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400472 * dummy driver just fails all IO.
473 */
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500474
Stefan Richter53dca512008-12-14 21:47:04 +0100475static int dummy_enable(struct fw_card *card, u32 *config_rom, size_t length)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500476{
477 BUG();
478 return -1;
479}
480
Stefan Richter53dca512008-12-14 21:47:04 +0100481static int dummy_update_phy_reg(struct fw_card *card, int address,
482 int clear_bits, int set_bits)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500483{
484 return -ENODEV;
485}
486
Stefan Richter53dca512008-12-14 21:47:04 +0100487static int dummy_set_config_rom(struct fw_card *card,
488 u32 *config_rom, size_t length)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500489{
Kristian Høgsbergc781c062007-05-07 20:33:32 -0400490 /*
491 * We take the card out of card_list before setting the dummy
492 * driver, so this should never get called.
493 */
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500494 BUG();
495 return -1;
496}
497
Stefan Richter53dca512008-12-14 21:47:04 +0100498static void dummy_send_request(struct fw_card *card, struct fw_packet *packet)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500499{
Stefan Richter5e20c282007-01-21 20:44:09 +0100500 packet->callback(packet, card, -ENODEV);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500501}
502
Stefan Richter53dca512008-12-14 21:47:04 +0100503static void dummy_send_response(struct fw_card *card, struct fw_packet *packet)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500504{
Stefan Richter5e20c282007-01-21 20:44:09 +0100505 packet->callback(packet, card, -ENODEV);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500506}
507
Stefan Richter53dca512008-12-14 21:47:04 +0100508static int dummy_cancel_packet(struct fw_card *card, struct fw_packet *packet)
Kristian Høgsberg730c32f2007-02-06 14:49:32 -0500509{
510 return -ENOENT;
511}
512
Stefan Richter53dca512008-12-14 21:47:04 +0100513static int dummy_enable_phys_dma(struct fw_card *card,
514 int node_id, int generation)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500515{
516 return -ENODEV;
517}
518
519static struct fw_card_driver dummy_driver = {
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500520 .enable = dummy_enable,
521 .update_phy_reg = dummy_update_phy_reg,
522 .set_config_rom = dummy_set_config_rom,
Stefan Richter5e20c282007-01-21 20:44:09 +0100523 .send_request = dummy_send_request,
Kristian Høgsberg730c32f2007-02-06 14:49:32 -0500524 .cancel_packet = dummy_cancel_packet,
Stefan Richter5e20c282007-01-21 20:44:09 +0100525 .send_response = dummy_send_response,
Stefan Richter5af4e5e2007-01-21 20:45:32 +0100526 .enable_phys_dma = dummy_enable_phys_dma,
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500527};
528
Stefan Richter53dca512008-12-14 21:47:04 +0100529void fw_card_release(struct kref *kref)
Stefan Richter459f7922008-05-24 16:50:22 +0200530{
531 struct fw_card *card = container_of(kref, struct fw_card, kref);
532
533 complete(&card->done);
534}
535
Stefan Richter53dca512008-12-14 21:47:04 +0100536void fw_core_remove_card(struct fw_card *card)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500537{
Marc Butlerecab4132007-03-23 10:24:02 -0600538 card->driver->update_phy_reg(card, 4,
539 PHY_LINK_ACTIVE | PHY_CONTENDER, 0);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500540 fw_core_initiate_bus_reset(card, 1);
541
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -0400542 mutex_lock(&card_mutex);
Stefan Richtere747a5c2009-01-24 20:35:38 +0100543 list_del_init(&card->link);
Kristian Høgsberg6a5033b2007-05-07 20:33:33 -0400544 mutex_unlock(&card_mutex);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500545
546 /* Set up the dummy driver. */
547 card->driver = &dummy_driver;
548
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500549 fw_destroy_nodes(card);
Stefan Richter459f7922008-05-24 16:50:22 +0200550
551 /* Wait for all users, especially device workqueue jobs, to finish. */
552 fw_card_put(card);
553 wait_for_completion(&card->done);
Stefan Richter8a2d9ed2007-08-21 01:05:14 +0200554
Stefan Richter1e8afea2008-07-12 14:51:18 +0200555 WARN_ON(!list_empty(&card->transaction_list));
Stefan Richter8a2d9ed2007-08-21 01:05:14 +0200556 del_timer_sync(&card->flush_timer);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500557}
558EXPORT_SYMBOL(fw_core_remove_card);
559
Stefan Richter53dca512008-12-14 21:47:04 +0100560int fw_core_initiate_bus_reset(struct fw_card *card, int short_reset)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500561{
Marc Butlerecab4132007-03-23 10:24:02 -0600562 int reg = short_reset ? 5 : 1;
Marc Butlerecab4132007-03-23 10:24:02 -0600563 int bit = short_reset ? PHY_BUS_SHORT_RESET : PHY_BUS_RESET;
564
565 return card->driver->update_phy_reg(card, reg, 0, bit);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500566}
567EXPORT_SYMBOL(fw_core_initiate_bus_reset);