Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IEEE 1394 for Linux | |
3 | * | |
4 | * Low level (host adapter) management. | |
5 | * | |
6 | * Copyright (C) 1999 Andreas E. Bombe | |
7 | * Copyright (C) 1999 Emanuel Pirker | |
8 | * | |
9 | * This code is licensed under the GPL. See the file COPYING in the root | |
10 | * directory of the kernel sources for details. | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/module.h> |
14 | #include <linux/types.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/pci.h> | |
19 | #include <linux/timer.h> | |
63bea350 | 20 | #include <linux/jiffies.h> |
fa7614de | 21 | #include <linux/mutex.h> |
1da177e4 LT |
22 | |
23 | #include "csr1212.h" | |
24 | #include "ieee1394.h" | |
25 | #include "ieee1394_types.h" | |
26 | #include "hosts.h" | |
27 | #include "ieee1394_core.h" | |
28 | #include "highlevel.h" | |
29 | #include "nodemgr.h" | |
30 | #include "csr.h" | |
31 | #include "config_roms.h" | |
32 | ||
33 | ||
34 | static void delayed_reset_bus(void * __reset_info) | |
35 | { | |
36 | struct hpsb_host *host = (struct hpsb_host*)__reset_info; | |
37 | int generation = host->csr.generation + 1; | |
38 | ||
39 | /* The generation field rolls over to 2 rather than 0 per IEEE | |
40 | * 1394a-2000. */ | |
41 | if (generation > 0xf || generation < 2) | |
42 | generation = 2; | |
43 | ||
44 | CSR_SET_BUS_INFO_GENERATION(host->csr.rom, generation); | |
45 | if (csr1212_generate_csr_image(host->csr.rom) != CSR1212_SUCCESS) { | |
46 | /* CSR image creation failed, reset generation field and do not | |
47 | * issue a bus reset. */ | |
48 | CSR_SET_BUS_INFO_GENERATION(host->csr.rom, host->csr.generation); | |
49 | return; | |
50 | } | |
51 | ||
52 | host->csr.generation = generation; | |
53 | ||
54 | host->update_config_rom = 0; | |
55 | if (host->driver->set_hw_config_rom) | |
56 | host->driver->set_hw_config_rom(host, host->csr.rom->bus_info_data); | |
57 | ||
58 | host->csr.gen_timestamp[host->csr.generation] = jiffies; | |
59 | hpsb_reset_bus(host, SHORT_RESET); | |
60 | } | |
61 | ||
62 | static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p) | |
63 | { | |
741854e4 | 64 | return 0; |
1da177e4 LT |
65 | } |
66 | ||
67 | static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg) | |
68 | { | |
741854e4 | 69 | return -1; |
1da177e4 LT |
70 | } |
71 | ||
72 | static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command, unsigned long arg) | |
73 | { | |
74 | return -1; | |
75 | } | |
76 | ||
77 | static struct hpsb_host_driver dummy_driver = { | |
741854e4 SR |
78 | .transmit_packet = dummy_transmit_packet, |
79 | .devctl = dummy_devctl, | |
80 | .isoctl = dummy_isoctl | |
1da177e4 LT |
81 | }; |
82 | ||
83 | static int alloc_hostnum_cb(struct hpsb_host *host, void *__data) | |
84 | { | |
85 | int *hostnum = __data; | |
86 | ||
87 | if (host->id == *hostnum) | |
88 | return 1; | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | /** | |
94 | * hpsb_alloc_host - allocate a new host controller. | |
95 | * @drv: the driver that will manage the host controller | |
96 | * @extra: number of extra bytes to allocate for the driver | |
97 | * | |
98 | * Allocate a &hpsb_host and initialize the general subsystem specific | |
99 | * fields. If the driver needs to store per host data, as drivers | |
100 | * usually do, the amount of memory required can be specified by the | |
101 | * @extra parameter. Once allocated, the driver should initialize the | |
102 | * driver specific parts, enable the controller and make it available | |
103 | * to the general subsystem using hpsb_add_host(). | |
104 | * | |
d6e05edc | 105 | * Return Value: a pointer to the &hpsb_host if successful, %NULL if |
1da177e4 LT |
106 | * no memory was available. |
107 | */ | |
fa7614de | 108 | static DEFINE_MUTEX(host_num_alloc); |
1da177e4 | 109 | |
d3788348 IM |
110 | /* |
111 | * The pending_packet_queue is special in that it's processed | |
112 | * from hardirq context too (such as hpsb_bus_reset()). Hence | |
113 | * split the lock class from the usual networking skb-head | |
114 | * lock class by using a separate key for it: | |
115 | */ | |
116 | static struct lock_class_key pending_packet_queue_key; | |
117 | ||
1da177e4 LT |
118 | struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra, |
119 | struct device *dev) | |
120 | { | |
741854e4 | 121 | struct hpsb_host *h; |
1da177e4 LT |
122 | int i; |
123 | int hostnum = 0; | |
124 | ||
741854e4 SR |
125 | h = kzalloc(sizeof(*h) + extra, SLAB_KERNEL); |
126 | if (!h) | |
8551158a | 127 | return NULL; |
1da177e4 LT |
128 | |
129 | h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h); | |
130 | if (!h->csr.rom) { | |
131 | kfree(h); | |
132 | return NULL; | |
133 | } | |
134 | ||
135 | h->hostdata = h + 1; | |
741854e4 | 136 | h->driver = drv; |
1da177e4 LT |
137 | |
138 | skb_queue_head_init(&h->pending_packet_queue); | |
d3788348 IM |
139 | lockdep_set_class(&h->pending_packet_queue.lock, |
140 | &pending_packet_queue_key); | |
1da177e4 LT |
141 | INIT_LIST_HEAD(&h->addr_space); |
142 | ||
143 | for (i = 2; i < 16; i++) | |
144 | h->csr.gen_timestamp[i] = jiffies - 60 * HZ; | |
145 | ||
146 | for (i = 0; i < ARRAY_SIZE(h->tpool); i++) | |
147 | HPSB_TPOOL_INIT(&h->tpool[i]); | |
148 | ||
149 | atomic_set(&h->generation, 0); | |
150 | ||
151 | INIT_WORK(&h->delayed_reset, delayed_reset_bus, h); | |
152 | ||
153 | init_timer(&h->timeout); | |
154 | h->timeout.data = (unsigned long) h; | |
155 | h->timeout.function = abort_timedouts; | |
156 | h->timeout_interval = HZ / 20; // 50ms by default | |
157 | ||
741854e4 SR |
158 | h->topology_map = h->csr.topology_map + 3; |
159 | h->speed_map = (u8 *)(h->csr.speed_map + 2); | |
1da177e4 | 160 | |
fa7614de | 161 | mutex_lock(&host_num_alloc); |
1da177e4 LT |
162 | |
163 | while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb)) | |
164 | hostnum++; | |
165 | ||
166 | h->id = hostnum; | |
167 | ||
168 | memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device)); | |
169 | h->device.parent = dev; | |
170 | snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id); | |
171 | ||
172 | h->class_dev.dev = &h->device; | |
173 | h->class_dev.class = &hpsb_host_class; | |
174 | snprintf(h->class_dev.class_id, BUS_ID_SIZE, "fw-host%d", h->id); | |
175 | ||
176 | device_register(&h->device); | |
177 | class_device_register(&h->class_dev); | |
178 | get_device(&h->device); | |
179 | ||
fa7614de | 180 | mutex_unlock(&host_num_alloc); |
1da177e4 LT |
181 | |
182 | return h; | |
183 | } | |
184 | ||
185 | int hpsb_add_host(struct hpsb_host *host) | |
186 | { | |
187 | if (hpsb_default_host_entry(host)) | |
188 | return -ENOMEM; | |
189 | ||
190 | hpsb_add_extra_config_roms(host); | |
191 | ||
192 | highlevel_add_host(host); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | void hpsb_remove_host(struct hpsb_host *host) | |
198 | { | |
741854e4 | 199 | host->is_shutdown = 1; |
1da177e4 LT |
200 | |
201 | cancel_delayed_work(&host->delayed_reset); | |
202 | flush_scheduled_work(); | |
203 | ||
741854e4 | 204 | host->driver = &dummy_driver; |
1da177e4 | 205 | |
741854e4 | 206 | highlevel_remove_host(host); |
1da177e4 LT |
207 | |
208 | hpsb_remove_extra_config_roms(host); | |
209 | ||
210 | class_device_unregister(&host->class_dev); | |
211 | device_unregister(&host->device); | |
212 | } | |
213 | ||
214 | int hpsb_update_config_rom_image(struct hpsb_host *host) | |
215 | { | |
216 | unsigned long reset_delay; | |
217 | int next_gen = host->csr.generation + 1; | |
218 | ||
219 | if (!host->update_config_rom) | |
220 | return -EINVAL; | |
221 | ||
222 | if (next_gen > 0xf) | |
223 | next_gen = 2; | |
224 | ||
225 | /* Stop the delayed interrupt, we're about to change the config rom and | |
226 | * it would be a waste to do a bus reset twice. */ | |
227 | cancel_delayed_work(&host->delayed_reset); | |
228 | ||
229 | /* IEEE 1394a-2000 prohibits using the same generation number | |
230 | * twice in a 60 second period. */ | |
63bea350 | 231 | if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ)) |
1da177e4 LT |
232 | /* Wait 60 seconds from the last time this generation number was |
233 | * used. */ | |
234 | reset_delay = (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies; | |
235 | else | |
236 | /* Wait 1 second in case some other code wants to change the | |
237 | * Config ROM in the near future. */ | |
238 | reset_delay = HZ; | |
239 | ||
240 | PREPARE_WORK(&host->delayed_reset, delayed_reset_bus, host); | |
241 | schedule_delayed_work(&host->delayed_reset, reset_delay); | |
242 | ||
243 | return 0; | |
244 | } |