blob: c502c6e9c440bea39cd64c2d0225ffa96b3929b2 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
33static 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
61static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p)
62{
63 return 0;
64}
65
66static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg)
67{
68 return -1;
69}
70
71static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command, unsigned long arg)
72{
73 return -1;
74}
75
76static struct hpsb_host_driver dummy_driver = {
77 .transmit_packet = dummy_transmit_packet,
78 .devctl = dummy_devctl,
79 .isoctl = dummy_isoctl
80};
81
82static 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 */
107static DECLARE_MUTEX(host_num_alloc);
108
109struct 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
174int 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
186void 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
203int 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}