4 * Low level (host adapter) management.
6 * Copyright (C) 1999 Andreas E. Bombe
7 * Copyright (C) 1999 Emanuel Pirker
9 * This code is licensed under the GPL. See the file COPYING in the root
10 * directory of the kernel sources for details.
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/pci.h>
19 #include <linux/timer.h>
20 #include <linux/jiffies.h>
21 #include <linux/mutex.h>
25 #include "ieee1394_types.h"
27 #include "ieee1394_core.h"
28 #include "highlevel.h"
31 #include "config_roms.h"
34 static void delayed_reset_bus(struct work_struct *work)
36 struct hpsb_host *host =
37 container_of(work, struct hpsb_host, delayed_reset.work);
38 int generation = host->csr.generation + 1;
40 /* The generation field rolls over to 2 rather than 0 per IEEE
42 if (generation > 0xf || generation < 2)
45 CSR_SET_BUS_INFO_GENERATION(host->csr.rom, generation);
46 if (csr1212_generate_csr_image(host->csr.rom) != CSR1212_SUCCESS) {
47 /* CSR image creation failed.
48 * Reset generation field and do not issue a bus reset. */
49 CSR_SET_BUS_INFO_GENERATION(host->csr.rom,
50 host->csr.generation);
54 host->csr.generation = generation;
56 host->update_config_rom = 0;
57 if (host->driver->set_hw_config_rom)
58 host->driver->set_hw_config_rom(host,
59 host->csr.rom->bus_info_data);
61 host->csr.gen_timestamp[host->csr.generation] = jiffies;
62 hpsb_reset_bus(host, SHORT_RESET);
65 static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p)
70 static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg)
75 static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command,
81 static struct hpsb_host_driver dummy_driver = {
82 .transmit_packet = dummy_transmit_packet,
83 .devctl = dummy_devctl,
84 .isoctl = dummy_isoctl
87 static int alloc_hostnum_cb(struct hpsb_host *host, void *__data)
89 int *hostnum = __data;
91 if (host->id == *hostnum)
97 static DEFINE_MUTEX(host_num_alloc);
100 * hpsb_alloc_host - allocate a new host controller.
101 * @drv: the driver that will manage the host controller
102 * @extra: number of extra bytes to allocate for the driver
104 * Allocate a &hpsb_host and initialize the general subsystem specific
105 * fields. If the driver needs to store per host data, as drivers
106 * usually do, the amount of memory required can be specified by the
107 * @extra parameter. Once allocated, the driver should initialize the
108 * driver specific parts, enable the controller and make it available
109 * to the general subsystem using hpsb_add_host().
111 * Return Value: a pointer to the &hpsb_host if successful, %NULL if
112 * no memory was available.
114 struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
121 h = kzalloc(sizeof(*h) + extra, GFP_KERNEL);
125 h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h);
132 INIT_LIST_HEAD(&h->pending_packets);
133 INIT_LIST_HEAD(&h->addr_space);
135 for (i = 2; i < 16; i++)
136 h->csr.gen_timestamp[i] = jiffies - 60 * HZ;
138 atomic_set(&h->generation, 0);
140 INIT_DELAYED_WORK(&h->delayed_reset, delayed_reset_bus);
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, half of minimum SPLIT_TIMEOUT */
147 h->topology_map = h->csr.topology_map + 3;
148 h->speed_map = (u8 *)(h->csr.speed_map + 2);
150 mutex_lock(&host_num_alloc);
151 while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb))
153 mutex_unlock(&host_num_alloc);
156 memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
157 h->device.parent = dev;
158 snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
160 h->class_dev.dev = &h->device;
161 h->class_dev.class = &hpsb_host_class;
162 snprintf(h->class_dev.class_id, BUS_ID_SIZE, "fw-host%d", h->id);
164 if (device_register(&h->device))
166 if (class_device_register(&h->class_dev)) {
167 device_unregister(&h->device);
170 get_device(&h->device);
179 int hpsb_add_host(struct hpsb_host *host)
181 if (hpsb_default_host_entry(host))
184 highlevel_add_host(host);
188 void hpsb_resume_host(struct hpsb_host *host)
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);
196 void hpsb_remove_host(struct hpsb_host *host)
198 host->is_shutdown = 1;
200 cancel_delayed_work(&host->delayed_reset);
201 flush_scheduled_work();
203 host->driver = &dummy_driver;
204 highlevel_remove_host(host);
206 class_device_unregister(&host->class_dev);
207 device_unregister(&host->device);
211 * hpsb_update_config_rom_image - updates configuration ROM image of a host
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.
218 int hpsb_update_config_rom_image(struct hpsb_host *host)
220 unsigned long reset_delay;
221 int next_gen = host->csr.generation + 1;
223 if (!host->update_config_rom)
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);
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
239 (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies;
241 /* Wait 1 second in case some other code wants to change the
242 * Config ROM in the near future. */
245 PREPARE_DELAYED_WORK(&host->delayed_reset, delayed_reset_bus);
246 schedule_delayed_work(&host->delayed_reset, reset_delay);