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 33static 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 64static int dummy_transmit_packet(struct hpsb_host *h, struct hpsb_packet *p) 65{ 66 return 0; 67} 68 69static int dummy_devctl(struct hpsb_host *h, enum devctl_cmd c, int arg) 70{ 71 return -1; 72} 73 74static int dummy_isoctl(struct hpsb_iso *iso, enum isoctl_cmd command, 75 unsigned long arg) 76{ 77 return -1; 78} 79 80static struct hpsb_host_driver dummy_driver = { 81 .transmit_packet = dummy_transmit_packet, 82 .devctl = dummy_devctl, 83 .isoctl = dummy_isoctl 84}; 85 86static 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 96static 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 */ 113struct 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 snprintf(h->device.bus_id, BUS_ID_SIZE, "fw-host%d", h->id); 158 159 h->class_dev.dev = &h->device; 160 h->class_dev.class = &hpsb_host_class; 161 snprintf(h->class_dev.class_id, BUS_ID_SIZE, "fw-host%d", h->id); 162 163 if (device_register(&h->device)) 164 goto fail; 165 if (class_device_register(&h->class_dev)) { 166 device_unregister(&h->device); 167 goto fail; 168 } 169 get_device(&h->device); 170 171 return h; 172 173fail: 174 kfree(h); 175 return NULL; 176} 177 178int hpsb_add_host(struct hpsb_host *host) 179{ 180 if (hpsb_default_host_entry(host)) 181 return -ENOMEM; 182 183 highlevel_add_host(host); 184 return 0; 185} 186 187void hpsb_resume_host(struct hpsb_host *host) 188{ 189 if (host->driver->set_hw_config_rom) 190 host->driver->set_hw_config_rom(host, 191 host->csr.rom->bus_info_data); 192 host->driver->devctl(host, RESET_BUS, SHORT_RESET); 193} 194 195void hpsb_remove_host(struct hpsb_host *host) 196{ 197 host->is_shutdown = 1; 198 199 cancel_delayed_work(&host->delayed_reset); 200 flush_scheduled_work(); 201 202 host->driver = &dummy_driver; 203 highlevel_remove_host(host); 204 205 class_device_unregister(&host->class_dev); 206 device_unregister(&host->device); 207} 208 209/** 210 * hpsb_update_config_rom_image - updates configuration ROM image of a host 211 * 212 * Updates the configuration ROM image of a host. rom_version must be the 213 * current version, otherwise it will fail with return value -1. If this 214 * host does not support config-rom-update, it will return -%EINVAL. 215 * Return value 0 indicates success. 216 */ 217int hpsb_update_config_rom_image(struct hpsb_host *host) 218{ 219 unsigned long reset_delay; 220 int next_gen = host->csr.generation + 1; 221 222 if (!host->update_config_rom) 223 return -EINVAL; 224 225 if (next_gen > 0xf) 226 next_gen = 2; 227 228 /* Stop the delayed interrupt, we're about to change the config rom and 229 * it would be a waste to do a bus reset twice. */ 230 cancel_delayed_work(&host->delayed_reset); 231 232 /* IEEE 1394a-2000 prohibits using the same generation number 233 * twice in a 60 second period. */ 234 if (time_before(jiffies, host->csr.gen_timestamp[next_gen] + 60 * HZ)) 235 /* Wait 60 seconds from the last time this generation number was 236 * used. */ 237 reset_delay = 238 (60 * HZ) + host->csr.gen_timestamp[next_gen] - jiffies; 239 else 240 /* Wait 1 second in case some other code wants to change the 241 * Config ROM in the near future. */ 242 reset_delay = HZ; 243 244 PREPARE_DELAYED_WORK(&host->delayed_reset, delayed_reset_bus); 245 schedule_delayed_work(&host->delayed_reset, reset_delay); 246 247 return 0; 248} 249