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>
24 #include "ieee1394_types.h"
26 #include "ieee1394_core.h"
27 #include "highlevel.h"
30 #include "config_roms.h"
33 static void delayed_reset_bus(void * __reset_info)
35 struct hpsb_host *host = (struct hpsb_host*)__reset_info;
36 int generation = host->csr.generation + 1;
38 /* The generation field rolls over to 2 rather than 0 per IEEE
40 if (generation > 0xf || generation < 2)
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);
51 host->csr.generation = generation;
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);
57 host->csr.gen_timestamp[host->csr.generation] = jiffies;
58 hpsb_reset_bus(host, SHORT_RESET);
61 static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p)
66 static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg)
71 static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command, unsigned long arg)
76 static struct hpsb_host_driver dummy_driver = {
77 .transmit_packet = dummy_transmit_packet,
78 .devctl = dummy_devctl,
79 .isoctl = dummy_isoctl
82 static int alloc_hostnum_cb(struct hpsb_host *host, void *__data)
84 int *hostnum = __data;
86 if (host->id == *hostnum)
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
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().
104 * Return Value: a pointer to the &hpsb_host if succesful, %NULL if
105 * no memory was available.
107 static DECLARE_MUTEX(host_num_alloc);
109 struct hpsb_host *hpsb_alloc_host(struct hpsb_host_driver *drv, size_t extra,
116 h = kmalloc(sizeof(struct hpsb_host) + extra, SLAB_KERNEL);
118 memset(h, 0, sizeof(struct hpsb_host) + extra);
120 h->csr.rom = csr1212_create_csr(&csr_bus_ops, CSR_BUS_INFO_SIZE, h);
129 skb_queue_head_init(&h->pending_packet_queue);
130 INIT_LIST_HEAD(&h->addr_space);
132 for (i = 2; i < 16; i++)
133 h->csr.gen_timestamp[i] = jiffies - 60 * HZ;
135 for (i = 0; i < ARRAY_SIZE(h->tpool); i++)
136 HPSB_TPOOL_INIT(&h->tpool[i]);
138 atomic_set(&h->generation, 0);
140 INIT_WORK(&h->delayed_reset, delayed_reset_bus, h);
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
147 h->topology_map = h->csr.topology_map + 3;
148 h->speed_map = (u8 *)(h->csr.speed_map + 2);
150 down(&host_num_alloc);
152 while (nodemgr_for_each_host(&hostnum, alloc_hostnum_cb))
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);
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);
165 device_register(&h->device);
166 class_device_register(&h->class_dev);
167 get_device(&h->device);
174 int hpsb_add_host(struct hpsb_host *host)
176 if (hpsb_default_host_entry(host))
179 hpsb_add_extra_config_roms(host);
181 highlevel_add_host(host);
186 void hpsb_remove_host(struct hpsb_host *host)
188 host->is_shutdown = 1;
190 cancel_delayed_work(&host->delayed_reset);
191 flush_scheduled_work();
193 host->driver = &dummy_driver;
195 highlevel_remove_host(host);
197 hpsb_remove_extra_config_roms(host);
199 class_device_unregister(&host->class_dev);
200 device_unregister(&host->device);
203 int hpsb_update_config_rom_image(struct hpsb_host *host)
205 unsigned long reset_delay;
206 int next_gen = host->csr.generation + 1;
208 if (!host->update_config_rom)
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);
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
223 reset_delay = (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies;
225 /* Wait 1 second in case some other code wants to change the
226 * Config ROM in the near future. */
229 PREPARE_WORK(&host->delayed_reset, delayed_reset_bus, host);
230 schedule_delayed_work(&host->delayed_reset, reset_delay);