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