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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 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/pci.h> | |
20 | #include <linux/timer.h> | |
63bea350 | 21 | #include <linux/jiffies.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 | { | |
64 | return 0; | |
65 | } | |
66 | ||
67 | static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg) | |
68 | { | |
69 | return -1; | |
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 = { | |
78 | .transmit_packet = dummy_transmit_packet, | |
79 | .devctl = dummy_devctl, | |
80 | .isoctl = dummy_isoctl | |
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 | * | |
105 | * Return Value: a pointer to the &hpsb_host if succesful, %NULL if | |
106 | * no memory was available. | |
107 | */ | |
108 | static DECLARE_MUTEX(host_num_alloc); | |
109 | ||
110 | struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra, | |
111 | struct device *dev) | |
112 | { | |
113 | struct hpsb_host *h; | |
114 | int i; | |
115 | int hostnum = 0; | |
116 | ||
8551158a SR |
117 | h = kzalloc(sizeof(*h) + extra, SLAB_KERNEL); |
118 | if (!h) | |
119 | return NULL; | |
1da177e4 LT |
120 | |
121 | h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h); | |
122 | if (!h->csr.rom) { | |
123 | kfree(h); | |
124 | return NULL; | |
125 | } | |
126 | ||
127 | h->hostdata = h + 1; | |
128 | h->driver = drv; | |
129 | ||
130 | skb_queue_head_init(&h->pending_packet_queue); | |
131 | INIT_LIST_HEAD(&h->addr_space); | |
132 | ||
133 | for (i = 2; i < 16; i++) | |
134 | h->csr.gen_timestamp[i] = jiffies - 60 * HZ; | |
135 | ||
136 | for (i = 0; i < ARRAY_SIZE(h->tpool); i++) | |
137 | HPSB_TPOOL_INIT(&h->tpool[i]); | |
138 | ||
139 | atomic_set(&h->generation, 0); | |
140 | ||
141 | INIT_WORK(&h->delayed_reset, delayed_reset_bus, h); | |
142 | ||
143 | init_timer(&h->timeout); | |
144 | h->timeout.data = (unsigned long) h; | |
145 | h->timeout.function = abort_timedouts; | |
146 | h->timeout_interval = HZ / 20; // 50ms by default | |
147 | ||
148 | h->topology_map = h->csr.topology_map + 3; | |
149 | h->speed_map = (u8 *)(h->csr.speed_map + 2); | |
150 | ||
151 | down(&host_num_alloc); | |
152 | ||
153 | while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb)) | |
154 | hostnum++; | |
155 | ||
156 | h->id = hostnum; | |
157 | ||
158 | memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device)); | |
159 | h->device.parent = dev; | |
160 | snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id); | |
161 | ||
162 | h->class_dev.dev = &h->device; | |
163 | h->class_dev.class = &hpsb_host_class; | |
164 | snprintf(h->class_dev.class_id, BUS_ID_SIZE, "fw-host%d", h->id); | |
165 | ||
166 | device_register(&h->device); | |
167 | class_device_register(&h->class_dev); | |
168 | get_device(&h->device); | |
169 | ||
170 | up(&host_num_alloc); | |
171 | ||
172 | return h; | |
173 | } | |
174 | ||
175 | int hpsb_add_host(struct hpsb_host *host) | |
176 | { | |
177 | if (hpsb_default_host_entry(host)) | |
178 | return -ENOMEM; | |
179 | ||
180 | hpsb_add_extra_config_roms(host); | |
181 | ||
182 | highlevel_add_host(host); | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | void hpsb_remove_host(struct hpsb_host *host) | |
188 | { | |
189 | host->is_shutdown = 1; | |
190 | ||
191 | cancel_delayed_work(&host->delayed_reset); | |
192 | flush_scheduled_work(); | |
193 | ||
194 | host->driver = &dummy_driver; | |
195 | ||
196 | highlevel_remove_host(host); | |
197 | ||
198 | hpsb_remove_extra_config_roms(host); | |
199 | ||
200 | class_device_unregister(&host->class_dev); | |
201 | device_unregister(&host->device); | |
202 | } | |
203 | ||
204 | int hpsb_update_config_rom_image(struct hpsb_host *host) | |
205 | { | |
206 | unsigned long reset_delay; | |
207 | int next_gen = host->csr.generation + 1; | |
208 | ||
209 | if (!host->update_config_rom) | |
210 | return -EINVAL; | |
211 | ||
212 | if (next_gen > 0xf) | |
213 | next_gen = 2; | |
214 | ||
215 | /* Stop the delayed interrupt, we're about to change the config rom and | |
216 | * it would be a waste to do a bus reset twice. */ | |
217 | cancel_delayed_work(&host->delayed_reset); | |
218 | ||
219 | /* IEEE 1394a-2000 prohibits using the same generation number | |
220 | * twice in a 60 second period. */ | |
63bea350 | 221 | if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ)) |
1da177e4 LT |
222 | /* Wait 60 seconds from the last time this generation number was |
223 | * used. */ | |
224 | reset_delay = (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies; | |
225 | else | |
226 | /* Wait 1 second in case some other code wants to change the | |
227 | * Config ROM in the near future. */ | |
228 | reset_delay = HZ; | |
229 | ||
230 | PREPARE_WORK(&host->delayed_reset, delayed_reset_bus, host); | |
231 | schedule_delayed_work(&host->delayed_reset, reset_delay); | |
232 | ||
233 | return 0; | |
234 | } |