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/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 #include <linux/jiffies.h>
22 #include <linux/mutex.h>
26 #include "ieee1394_types.h"
28 #include "ieee1394_core.h"
29 #include "highlevel.h"
32 #include "config_roms.h"
35 static void delayed_reset_bus(void * __reset_info)
37 struct hpsb_host *host = (struct hpsb_host*)__reset_info;
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, reset generation field and do not
48 * issue a bus reset. */
49 CSR_SET_BUS_INFO_GENERATION(host->csr.rom, host->csr.generation);
53 host->csr.generation = generation;
55 host->update_config_rom = 0;
56 if (host->driver->set_hw_config_rom)
57 host->driver->set_hw_config_rom(host, host->csr.rom->bus_info_data);
59 host->csr.gen_timestamp[host->csr.generation] = jiffies;
60 hpsb_reset_bus(host, SHORT_RESET);
63 static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p)
68 static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg)
73 static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command, unsigned long arg)
78 static struct hpsb_host_driver dummy_driver = {
79 .transmit_packet = dummy_transmit_packet,
80 .devctl = dummy_devctl,
81 .isoctl = dummy_isoctl
84 static int alloc_hostnum_cb(struct hpsb_host *host, void *__data)
86 int *hostnum = __data;
88 if (host->id == *hostnum)
95 * hpsb_alloc_host - allocate a new host controller.
96 * @drv: the driver that will manage the host controller
97 * @extra: number of extra bytes to allocate for the driver
99 * Allocate a &hpsb_host and initialize the general subsystem specific
100 * fields. If the driver needs to store per host data, as drivers
101 * usually do, the amount of memory required can be specified by the
102 * @extra parameter. Once allocated, the driver should initialize the
103 * driver specific parts, enable the controller and make it available
104 * to the general subsystem using hpsb_add_host().
106 * Return Value: a pointer to the &hpsb_host if succesful, %NULL if
107 * no memory was available.
109 static DEFINE_MUTEX(host_num_alloc);
111 struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
118 h = kzalloc(sizeof(*h) + extra, SLAB_KERNEL);
122 h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h);
131 skb_queue_head_init(&h->pending_packet_queue);
132 INIT_LIST_HEAD(&h->addr_space);
134 for (i = 2; i < 16; i++)
135 h->csr.gen_timestamp[i] = jiffies - 60 * HZ;
137 for (i = 0; i < ARRAY_SIZE(h->tpool); i++)
138 HPSB_TPOOL_INIT(&h->tpool[i]);
140 atomic_set(&h->generation, 0);
142 INIT_WORK(&h->delayed_reset, delayed_reset_bus, h);
144 init_timer(&h->timeout);
145 h->timeout.data = (unsigned long) h;
146 h->timeout.function = abort_timedouts;
147 h->timeout_interval = HZ / 20; // 50ms by default
149 h->topology_map = h->csr.topology_map + 3;
150 h->speed_map = (u8 *)(h->csr.speed_map + 2);
152 mutex_lock(&host_num_alloc);
154 while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb))
159 memcpy(&h->device, &nodemgr_dev_template_host, sizeof(h->device));
160 h->device.parent = dev;
161 snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id);
163 h->class_dev.dev = &h->device;
164 h->class_dev.class = &hpsb_host_class;
165 snprintf(h->class_dev.class_id, BUS_ID_SIZE, "fw-host%d", h->id);
167 device_register(&h->device);
168 class_device_register(&h->class_dev);
169 get_device(&h->device);
171 mutex_unlock(&host_num_alloc);
176 int hpsb_add_host(struct hpsb_host *host)
178 if (hpsb_default_host_entry(host))
181 hpsb_add_extra_config_roms(host);
183 highlevel_add_host(host);
188 void hpsb_remove_host(struct hpsb_host *host)
190 host->is_shutdown = 1;
192 cancel_delayed_work(&host->delayed_reset);
193 flush_scheduled_work();
195 host->driver = &dummy_driver;
197 highlevel_remove_host(host);
199 hpsb_remove_extra_config_roms(host);
201 class_device_unregister(&host->class_dev);
202 device_unregister(&host->device);
205 int hpsb_update_config_rom_image(struct hpsb_host *host)
207 unsigned long reset_delay;
208 int next_gen = host->csr.generation + 1;
210 if (!host->update_config_rom)
216 /* Stop the delayed interrupt, we're about to change the config rom and
217 * it would be a waste to do a bus reset twice. */
218 cancel_delayed_work(&host->delayed_reset);
220 /* IEEE 1394a-2000 prohibits using the same generation number
221 * twice in a 60 second period. */
222 if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ))
223 /* Wait 60 seconds from the last time this generation number was
225 reset_delay = (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies;
227 /* Wait 1 second in case some other code wants to change the
228 * Config ROM in the near future. */
231 PREPARE_WORK(&host->delayed_reset, delayed_reset_bus, host);
232 schedule_delayed_work(&host->delayed_reset, reset_delay);