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/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/timer.h>
19 #include <linux/jiffies.h>
20 #include <linux/mutex.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(struct work_struct *work)
34 {
35 struct hpsb_host *host =
36 container_of(work, struct hpsb_host, delayed_reset.work);
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.
47 * Reset generation field and do not issue a bus reset. */
48 CSR_SET_BUS_INFO_GENERATION(host->csr.rom,
49 host->csr.generation);
50 return;
51 }
52
53 host->csr.generation = generation;
54
55 host->update_config_rom = 0;
56 if (host->driver->set_hw_config_rom)
57 host->driver->set_hw_config_rom(host,
58 host->csr.rom->bus_info_data);
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 {
66 return 0;
67 }
68
69 static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg)
70 {
71 return -1;
72 }
73
74 static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command,
75 unsigned long arg)
76 {
77 return -1;
78 }
79
80 static struct hpsb_host_driver dummy_driver = {
81 .transmit_packet = dummy_transmit_packet,
82 .devctl = dummy_devctl,
83 .isoctl = dummy_isoctl
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
96 static DEFINE_MUTEX(host_num_alloc);
97
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 *
110 * Return Value: a pointer to the &hpsb_host if successful, %NULL if
111 * no memory was available.
112 */
113 struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
114 struct device *dev)
115 {
116 struct hpsb_host *h;
117 int i;
118 int hostnum = 0;
119
120 h = kzalloc(sizeof(*h) + extra, GFP_KERNEL);
121 if (!h)
122 return NULL;
123
124 h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h);
125 if (!h->csr.rom)
126 goto fail;
127
128 h->hostdata = h + 1;
129 h->driver = drv;
130
131 INIT_LIST_HEAD(&h->pending_packets);
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
137 atomic_set(&h->generation, 0);
138
139 INIT_DELAYED_WORK(&h->delayed_reset, delayed_reset_bus);
140
141 init_timer(&h->timeout);
142 h->timeout.data = (unsigned long) h;
143 h->timeout.function = abort_timedouts;
144 h->timeout_interval = HZ / 20; /* 50ms, half of minimum SPLIT_TIMEOUT */
145
146 h->topology_map = h->csr.topology_map + 3;
147 h->speed_map = (u8 *)(h->csr.speed_map + 2);
148
149 mutex_lock(&host_num_alloc);
150 while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb))
151 hostnum++;
152 mutex_unlock(&host_num_alloc);
153 h->id = hostnum;
154
155 memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
156 h->device.parent = dev;
157 set_dev_node(&h->device, dev_to_node(dev));
158 snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
159
160 h->host_dev.parent = &h->device;
161 h->host_dev.class = &hpsb_host_class;
162 snprintf(h->host_dev.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
163
164 if (device_register(&h->device))
165 goto fail;
166 if (device_register(&h->host_dev)) {
167 device_unregister(&h->device);
168 goto fail;
169 }
170 get_device(&h->device);
171
172 return h;
173
174 fail:
175 kfree(h);
176 return NULL;
177 }
178
179 int hpsb_add_host(struct hpsb_host *host)
180 {
181 if (hpsb_default_host_entry(host))
182 return -ENOMEM;
183
184 highlevel_add_host(host);
185 return 0;
186 }
187
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
196 void hpsb_remove_host(struct hpsb_host *host)
197 {
198 host->is_shutdown = 1;
199
200 cancel_delayed_work(&host->delayed_reset);
201 flush_scheduled_work();
202
203 host->driver = &dummy_driver;
204 highlevel_remove_host(host);
205
206 device_unregister(&host->host_dev);
207 device_unregister(&host->device);
208 }
209
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 */
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. */
235 if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ))
236 /* Wait 60 seconds from the last time this generation number was
237 * used. */
238 reset_delay =
239 (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies;
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
245 PREPARE_DELAYED_WORK(&host->delayed_reset, delayed_reset_bus);
246 schedule_delayed_work(&host->delayed_reset, reset_delay);
247
248 return 0;
249 }
250
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