summaryrefslogtreecommitdiffstats
path: root/drivers/ieee1394/hosts.c
blob: d90a3a1898c0d4276bd6a1c7c0688f62a184a46b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
/*
 * IEEE 1394 for Linux
 *
 * Low level (host adapter) management.
 *
 * Copyright (C) 1999 Andreas E. Bombe
 * Copyright (C) 1999 Emanuel Pirker
 *
 * This code is licensed under the GPL.  See the file COPYING in the root
 * directory of the kernel sources for details.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>

#include "csr1212.h"
#include "ieee1394.h"
#include "ieee1394_types.h"
#include "hosts.h"
#include "ieee1394_core.h"
#include "highlevel.h"
#include "nodemgr.h"
#include "csr.h"
#include "config_roms.h"


static void delayed_reset_bus(void * __reset_info)
{
	struct hpsb_host *host = (struct hpsb_host*)__reset_info;
	int generation = host->csr.generation + 1;

	/* The generation field rolls over to 2 rather than 0 per IEEE
	 * 1394a-2000. */
	if (generation > 0xf || generation < 2)
		generation = 2;

	CSR_SET_BUS_INFO_GENERATION(host->csr.rom, generation);
	if (csr1212_generate_csr_image(host->csr.rom) != CSR1212_SUCCESS) {
		/* CSR image creation failed, reset generation field and do not
		 * issue a bus reset. */
		CSR_SET_BUS_INFO_GENERATION(host->csr.rom, host->csr.generation);
		return;
	}

	host->csr.generation = generation;

	host->update_config_rom = 0;
	if (host->driver->set_hw_config_rom)
		host->driver->set_hw_config_rom(host, host->csr.rom->bus_info_data);

	host->csr.gen_timestamp[host->csr.generation] = jiffies;
	hpsb_reset_bus(host, SHORT_RESET);
}

static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p)
{
	return 0;
}

static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg)
{
	return -1;
}

static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command, unsigned long arg)
{
	return -1;
}

static struct hpsb_host_driver dummy_driver = {
	.transmit_packet = dummy_transmit_packet,
	.devctl =	   dummy_devctl,
	.isoctl =	   dummy_isoctl
};

static int alloc_hostnum_cb(struct hpsb_host *host, void *__data)
{
	int *hostnum = __data;

	if (host->id == *hostnum)
		return 1;

	return 0;
}

/*
 * The pending_packet_queue is special in that it's processed
 * from hardirq context too (such as hpsb_bus_reset()). Hence
 * split the lock class from the usual networking skb-head
 * lock class by using a separate key for it:
 */
static struct lock_class_key pending_packet_queue_key;

static DEFINE_MUTEX(host_num_alloc);

/**
 * hpsb_alloc_host - allocate a new host controller.
 * @drv: the driver that will manage the host controller
 * @extra: number of extra bytes to allocate for the driver
 *
 * Allocate a &hpsb_host and initialize the general subsystem specific
 * fields.  If the driver needs to store per host data, as drivers
 * usually do, the amount of memory required can be specified by the
 * @extra parameter.  Once allocated, the driver should initialize the
 * driver specific parts, enable the controller and make it available
 * to the general subsystem using hpsb_add_host().
 *
 * Return Value: a pointer to the &hpsb_host if successful, %NULL if
 * no memory was available.
 */
struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
				  struct device *dev)
{
	struct hpsb_host *h;
	int i;
	int hostnum = 0;

	h = kzalloc(sizeof(*h) + extra, SLAB_KERNEL);
	if (!h)
		return NULL;

	h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h);
	if (!h->csr.rom) {
		kfree(h);
		return NULL;
	}

	h->hostdata = h + 1;
	h->driver = drv;

	skb_queue_head_init(&h->pending_packet_queue);
	lockdep_set_class(&h->pending_packet_queue.lock,
			   &pending_packet_queue_key);
	INIT_LIST_HEAD(&h->addr_space);

	for (i = 2; i < 16; i++)
		h->csr.gen_timestamp[i] = jiffies - 60 * HZ;

	atomic_set(&h->generation, 0);

	INIT_WORK(&h->delayed_reset, delayed_reset_bus, h);
	
	init_timer(&h->timeout);
	h->timeout.data = (unsigned long) h;
	h->timeout.function = abort_timedouts;
	h->timeout_interval = HZ / 20; // 50ms by default

	h->topology_map = h->csr.topology_map + 3;
	h->speed_map = (u8 *)(h->csr.speed_map + 2);

	mutex_lock(&host_num_alloc);

	while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb))
		hostnum++;

	h->id = hostnum;

	memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
	h->device.parent = dev;
	snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);

	h->class_dev.dev = &h->device;
	h->class_dev.class = &hpsb_host_class;
	snprintf(h->class_dev.class_id, BUS_ID_SIZE, "fw-host%d", h->id);

	device_register(&h->device);
	class_device_register(&h->class_dev);
	get_device(&h->device);

	mutex_unlock(&host_num_alloc);

	return h;
}

int hpsb_add_host(struct hpsb_host *host)
{
	if (hpsb_default_host_entry(host))
		return -ENOMEM;

	hpsb_add_extra_config_roms(host);

	highlevel_add_host(host);

	return 0;
}

void hpsb_remove_host(struct hpsb_host *host)
{
	host->is_shutdown = 1;

	cancel_delayed_work(&host->delayed_reset);
	flush_scheduled_work();

	host->driver = &dummy_driver;

	highlevel_remove_host(host);

	hpsb_remove_extra_config_roms(host);

	class_device_unregister(&host->class_dev);
	device_unregister(&host->device);
}

int hpsb_update_config_rom_image(struct hpsb_host *host)
{
	unsigned long reset_delay;
	int next_gen = host->csr.generation + 1;

	if (!host->update_config_rom)
		return -EINVAL;

	if (next_gen > 0xf)
		next_gen = 2;

	/* Stop the delayed interrupt, we're about to change the config rom and
	 * it would be a waste to do a bus reset twice. */
	cancel_delayed_work(&host->delayed_reset);

	/* IEEE 1394a-2000 prohibits using the same generation number
	 * twice in a 60 second period. */
	if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ))
		/* Wait 60 seconds from the last time this generation number was
		 * used. */
		reset_delay = (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies;
	else
		/* Wait 1 second in case some other code wants to change the
		 * Config ROM in the near future. */
		reset_delay = HZ;

	PREPARE_WORK(&host->delayed_reset, delayed_reset_bus, host);
	schedule_delayed_work(&host->delayed_reset, reset_delay);

	return 0;
}
OpenPOWER on IntegriCloud