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> | |
1da177e4 | 18 | #include <linux/timer.h> |
63bea350 | 19 | #include <linux/jiffies.h> |
fa7614de | 20 | #include <linux/mutex.h> |
1da177e4 LT |
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 | ||
c4028958 | 33 | static void delayed_reset_bus(struct work_struct *work) |
1da177e4 | 34 | { |
c4028958 DH |
35 | struct hpsb_host *host = |
36 | container_of(work, struct hpsb_host, delayed_reset.work); | |
a5e6f64d | 37 | u8 generation = host->csr.generation + 1; |
1da177e4 LT |
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 | ||
a5e6f64d | 44 | csr_set_bus_info_generation(host->csr.rom, generation); |
1da177e4 | 45 | if (csr1212_generate_csr_image(host->csr.rom) != CSR1212_SUCCESS) { |
1ed891c6 SR |
46 | /* CSR image creation failed. |
47 | * Reset generation field and do not issue a bus reset. */ | |
a5e6f64d | 48 | csr_set_bus_info_generation(host->csr.rom, |
1ed891c6 | 49 | host->csr.generation); |
1da177e4 LT |
50 | return; |
51 | } | |
52 | ||
53 | host->csr.generation = generation; | |
54 | ||
55 | host->update_config_rom = 0; | |
56 | if (host->driver->set_hw_config_rom) | |
1ed891c6 SR |
57 | host->driver->set_hw_config_rom(host, |
58 | host->csr.rom->bus_info_data); | |
1da177e4 LT |
59 | |
60 | host->csr.gen_timestamp[host->csr.generation] = jiffies; | |
61 | hpsb_reset_bus(host, SHORT_RESET); | |
62 | } | |
63 | ||
64 | static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p) | |
65 | { | |
741854e4 | 66 | return 0; |
1da177e4 LT |
67 | } |
68 | ||
69 | static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg) | |
70 | { | |
741854e4 | 71 | return -1; |
1da177e4 LT |
72 | } |
73 | ||
1ed891c6 SR |
74 | static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command, |
75 | unsigned long arg) | |
1da177e4 LT |
76 | { |
77 | return -1; | |
78 | } | |
79 | ||
80 | static struct hpsb_host_driver dummy_driver = { | |
741854e4 SR |
81 | .transmit_packet = dummy_transmit_packet, |
82 | .devctl = dummy_devctl, | |
83 | .isoctl = dummy_isoctl | |
1da177e4 LT |
84 | }; |
85 | ||
86 | static int alloc_hostnum_cb(struct hpsb_host *host, void *__data) | |
87 | { | |
88 | int *hostnum = __data; | |
89 | ||
90 | if (host->id == *hostnum) | |
91 | return 1; | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
3c6c65f5 SR |
96 | static DEFINE_MUTEX(host_num_alloc); |
97 | ||
1da177e4 LT |
98 | /** |
99 | * hpsb_alloc_host - allocate a new host controller. | |
100 | * @drv: the driver that will manage the host controller | |
101 | * @extra: number of extra bytes to allocate for the driver | |
102 | * | |
103 | * Allocate a &hpsb_host and initialize the general subsystem specific | |
104 | * fields. If the driver needs to store per host data, as drivers | |
105 | * usually do, the amount of memory required can be specified by the | |
106 | * @extra parameter. Once allocated, the driver should initialize the | |
107 | * driver specific parts, enable the controller and make it available | |
108 | * to the general subsystem using hpsb_add_host(). | |
109 | * | |
d6e05edc | 110 | * Return Value: a pointer to the &hpsb_host if successful, %NULL if |
1da177e4 LT |
111 | * no memory was available. |
112 | */ | |
1da177e4 LT |
113 | struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra, |
114 | struct device *dev) | |
115 | { | |
741854e4 | 116 | struct hpsb_host *h; |
1da177e4 LT |
117 | int i; |
118 | int hostnum = 0; | |
119 | ||
e94b1766 | 120 | h = kzalloc(sizeof(*h) + extra, GFP_KERNEL); |
741854e4 | 121 | if (!h) |
8551158a | 122 | return NULL; |
1da177e4 LT |
123 | |
124 | h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h); | |
c1c9c7cd SR |
125 | if (!h->csr.rom) |
126 | goto fail; | |
1da177e4 LT |
127 | |
128 | h->hostdata = h + 1; | |
741854e4 | 129 | h->driver = drv; |
1da177e4 | 130 | |
7542e0e6 | 131 | INIT_LIST_HEAD(&h->pending_packets); |
1da177e4 LT |
132 | INIT_LIST_HEAD(&h->addr_space); |
133 | ||
134 | for (i = 2; i < 16; i++) | |
135 | h->csr.gen_timestamp[i] = jiffies - 60 * HZ; | |
136 | ||
1da177e4 LT |
137 | atomic_set(&h->generation, 0); |
138 | ||
c4028958 | 139 | INIT_DELAYED_WORK(&h->delayed_reset, delayed_reset_bus); |
1da177e4 LT |
140 | |
141 | init_timer(&h->timeout); | |
142 | h->timeout.data = (unsigned long) h; | |
143 | h->timeout.function = abort_timedouts; | |
1ed891c6 | 144 | h->timeout_interval = HZ / 20; /* 50ms, half of minimum SPLIT_TIMEOUT */ |
1da177e4 | 145 | |
741854e4 SR |
146 | h->topology_map = h->csr.topology_map + 3; |
147 | h->speed_map = (u8 *)(h->csr.speed_map + 2); | |
1da177e4 | 148 | |
fa7614de | 149 | mutex_lock(&host_num_alloc); |
1da177e4 LT |
150 | while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb)) |
151 | hostnum++; | |
5c37dcbe | 152 | mutex_unlock(&host_num_alloc); |
1da177e4 LT |
153 | h->id = hostnum; |
154 | ||
155 | memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device)); | |
156 | h->device.parent = dev; | |
93f2e025 | 157 | set_dev_node(&h->device, dev_to_node(dev)); |
233976e5 | 158 | dev_set_name(&h->device, "fw-host%d", h->id); |
1da177e4 | 159 | |
dd7f2928 KS |
160 | h->host_dev.parent = &h->device; |
161 | h->host_dev.class = &hpsb_host_class; | |
233976e5 | 162 | dev_set_name(&h->host_dev, "fw-host%d", h->id); |
1da177e4 | 163 | |
c1c9c7cd SR |
164 | if (device_register(&h->device)) |
165 | goto fail; | |
dd7f2928 | 166 | if (device_register(&h->host_dev)) { |
c1c9c7cd SR |
167 | device_unregister(&h->device); |
168 | goto fail; | |
169 | } | |
1da177e4 LT |
170 | get_device(&h->device); |
171 | ||
1da177e4 | 172 | return h; |
c1c9c7cd SR |
173 | |
174 | fail: | |
175 | kfree(h); | |
176 | return NULL; | |
1da177e4 LT |
177 | } |
178 | ||
179 | int hpsb_add_host(struct hpsb_host *host) | |
180 | { | |
181 | if (hpsb_default_host_entry(host)) | |
182 | return -ENOMEM; | |
70093cfd | 183 | |
1da177e4 | 184 | highlevel_add_host(host); |
1da177e4 LT |
185 | return 0; |
186 | } | |
187 | ||
3360177c SR |
188 | void hpsb_resume_host(struct hpsb_host *host) |
189 | { | |
190 | if (host->driver->set_hw_config_rom) | |
191 | host->driver->set_hw_config_rom(host, | |
192 | host->csr.rom->bus_info_data); | |
193 | host->driver->devctl(host, RESET_BUS, SHORT_RESET); | |
194 | } | |
195 | ||
1da177e4 LT |
196 | void hpsb_remove_host(struct hpsb_host *host) |
197 | { | |
741854e4 | 198 | host->is_shutdown = 1; |
1da177e4 LT |
199 | |
200 | cancel_delayed_work(&host->delayed_reset); | |
201 | flush_scheduled_work(); | |
202 | ||
741854e4 | 203 | host->driver = &dummy_driver; |
741854e4 | 204 | highlevel_remove_host(host); |
1da177e4 | 205 | |
dd7f2928 | 206 | device_unregister(&host->host_dev); |
1da177e4 LT |
207 | device_unregister(&host->device); |
208 | } | |
209 | ||
afd6546d SR |
210 | /** |
211 | * hpsb_update_config_rom_image - updates configuration ROM image of a host | |
212 | * | |
213 | * Updates the configuration ROM image of a host. rom_version must be the | |
214 | * current version, otherwise it will fail with return value -1. If this | |
215 | * host does not support config-rom-update, it will return -%EINVAL. | |
216 | * Return value 0 indicates success. | |
217 | */ | |
1da177e4 LT |
218 | int hpsb_update_config_rom_image(struct hpsb_host *host) |
219 | { | |
220 | unsigned long reset_delay; | |
221 | int next_gen = host->csr.generation + 1; | |
222 | ||
223 | if (!host->update_config_rom) | |
224 | return -EINVAL; | |
225 | ||
226 | if (next_gen > 0xf) | |
227 | next_gen = 2; | |
228 | ||
229 | /* Stop the delayed interrupt, we're about to change the config rom and | |
230 | * it would be a waste to do a bus reset twice. */ | |
231 | cancel_delayed_work(&host->delayed_reset); | |
232 | ||
233 | /* IEEE 1394a-2000 prohibits using the same generation number | |
234 | * twice in a 60 second period. */ | |
63bea350 | 235 | if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ)) |
1da177e4 LT |
236 | /* Wait 60 seconds from the last time this generation number was |
237 | * used. */ | |
1ed891c6 SR |
238 | reset_delay = |
239 | (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies; | |
1da177e4 LT |
240 | else |
241 | /* Wait 1 second in case some other code wants to change the | |
242 | * Config ROM in the near future. */ | |
243 | reset_delay = HZ; | |
244 | ||
c4028958 | 245 | PREPARE_DELAYED_WORK(&host->delayed_reset, delayed_reset_bus); |
1da177e4 LT |
246 | schedule_delayed_work(&host->delayed_reset, reset_delay); |
247 | ||
248 | return 0; | |
249 | } |