| 1 | /* |
| 2 | * CompactPCI Hot Plug Driver |
| 3 | * |
| 4 | * Copyright (C) 2002,2005 SOMA Networks, Inc. |
| 5 | * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) |
| 6 | * Copyright (C) 2001 IBM Corp. |
| 7 | * |
| 8 | * All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or (at |
| 13 | * your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 18 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 19 | * details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 24 | * |
| 25 | * Send feedback to <scottm@somanetworks.com> |
| 26 | */ |
| 27 | |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/pci.h> |
| 32 | #include <linux/pci_hotplug.h> |
| 33 | #include <linux/init.h> |
| 34 | #include <linux/interrupt.h> |
| 35 | #include <asm/atomic.h> |
| 36 | #include <linux/delay.h> |
| 37 | #include <linux/kthread.h> |
| 38 | #include "cpci_hotplug.h" |
| 39 | |
| 40 | #define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>" |
| 41 | #define DRIVER_DESC "CompactPCI Hot Plug Core" |
| 42 | |
| 43 | #define MY_NAME "cpci_hotplug" |
| 44 | |
| 45 | #define dbg(format, arg...) \ |
| 46 | do { \ |
| 47 | if (cpci_debug) \ |
| 48 | printk (KERN_DEBUG "%s: " format "\n", \ |
| 49 | MY_NAME , ## arg); \ |
| 50 | } while (0) |
| 51 | #define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg) |
| 52 | #define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg) |
| 53 | #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg) |
| 54 | |
| 55 | /* local variables */ |
| 56 | static DECLARE_RWSEM(list_rwsem); |
| 57 | static LIST_HEAD(slot_list); |
| 58 | static int slots; |
| 59 | static atomic_t extracting; |
| 60 | int cpci_debug; |
| 61 | static struct cpci_hp_controller *controller; |
| 62 | static struct task_struct *cpci_thread; |
| 63 | static int thread_finished; |
| 64 | |
| 65 | static int enable_slot(struct hotplug_slot *slot); |
| 66 | static int disable_slot(struct hotplug_slot *slot); |
| 67 | static int set_attention_status(struct hotplug_slot *slot, u8 value); |
| 68 | static int get_power_status(struct hotplug_slot *slot, u8 * value); |
| 69 | static int get_attention_status(struct hotplug_slot *slot, u8 * value); |
| 70 | static int get_adapter_status(struct hotplug_slot *slot, u8 * value); |
| 71 | static int get_latch_status(struct hotplug_slot *slot, u8 * value); |
| 72 | |
| 73 | static struct hotplug_slot_ops cpci_hotplug_slot_ops = { |
| 74 | .enable_slot = enable_slot, |
| 75 | .disable_slot = disable_slot, |
| 76 | .set_attention_status = set_attention_status, |
| 77 | .get_power_status = get_power_status, |
| 78 | .get_attention_status = get_attention_status, |
| 79 | .get_adapter_status = get_adapter_status, |
| 80 | .get_latch_status = get_latch_status, |
| 81 | }; |
| 82 | |
| 83 | static int |
| 84 | update_latch_status(struct hotplug_slot *hotplug_slot, u8 value) |
| 85 | { |
| 86 | struct hotplug_slot_info info; |
| 87 | |
| 88 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); |
| 89 | info.latch_status = value; |
| 90 | return pci_hp_change_slot_info(hotplug_slot, &info); |
| 91 | } |
| 92 | |
| 93 | static int |
| 94 | update_adapter_status(struct hotplug_slot *hotplug_slot, u8 value) |
| 95 | { |
| 96 | struct hotplug_slot_info info; |
| 97 | |
| 98 | memcpy(&info, hotplug_slot->info, sizeof(struct hotplug_slot_info)); |
| 99 | info.adapter_status = value; |
| 100 | return pci_hp_change_slot_info(hotplug_slot, &info); |
| 101 | } |
| 102 | |
| 103 | static int |
| 104 | enable_slot(struct hotplug_slot *hotplug_slot) |
| 105 | { |
| 106 | struct slot *slot = hotplug_slot->private; |
| 107 | int retval = 0; |
| 108 | |
| 109 | dbg("%s - physical_slot = %s", __func__, slot_name(slot)); |
| 110 | |
| 111 | if (controller->ops->set_power) |
| 112 | retval = controller->ops->set_power(slot, 1); |
| 113 | return retval; |
| 114 | } |
| 115 | |
| 116 | static int |
| 117 | disable_slot(struct hotplug_slot *hotplug_slot) |
| 118 | { |
| 119 | struct slot *slot = hotplug_slot->private; |
| 120 | int retval = 0; |
| 121 | |
| 122 | dbg("%s - physical_slot = %s", __func__, slot_name(slot)); |
| 123 | |
| 124 | down_write(&list_rwsem); |
| 125 | |
| 126 | /* Unconfigure device */ |
| 127 | dbg("%s - unconfiguring slot %s", __func__, slot_name(slot)); |
| 128 | if ((retval = cpci_unconfigure_slot(slot))) { |
| 129 | err("%s - could not unconfigure slot %s", |
| 130 | __func__, slot_name(slot)); |
| 131 | goto disable_error; |
| 132 | } |
| 133 | dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot)); |
| 134 | |
| 135 | /* Clear EXT (by setting it) */ |
| 136 | if (cpci_clear_ext(slot)) { |
| 137 | err("%s - could not clear EXT for slot %s", |
| 138 | __func__, slot_name(slot)); |
| 139 | retval = -ENODEV; |
| 140 | goto disable_error; |
| 141 | } |
| 142 | cpci_led_on(slot); |
| 143 | |
| 144 | if (controller->ops->set_power) |
| 145 | if ((retval = controller->ops->set_power(slot, 0))) |
| 146 | goto disable_error; |
| 147 | |
| 148 | if (update_adapter_status(slot->hotplug_slot, 0)) |
| 149 | warn("failure to update adapter file"); |
| 150 | |
| 151 | if (slot->extracting) { |
| 152 | slot->extracting = 0; |
| 153 | atomic_dec(&extracting); |
| 154 | } |
| 155 | disable_error: |
| 156 | up_write(&list_rwsem); |
| 157 | return retval; |
| 158 | } |
| 159 | |
| 160 | static u8 |
| 161 | cpci_get_power_status(struct slot *slot) |
| 162 | { |
| 163 | u8 power = 1; |
| 164 | |
| 165 | if (controller->ops->get_power) |
| 166 | power = controller->ops->get_power(slot); |
| 167 | return power; |
| 168 | } |
| 169 | |
| 170 | static int |
| 171 | get_power_status(struct hotplug_slot *hotplug_slot, u8 * value) |
| 172 | { |
| 173 | struct slot *slot = hotplug_slot->private; |
| 174 | |
| 175 | *value = cpci_get_power_status(slot); |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static int |
| 180 | get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) |
| 181 | { |
| 182 | struct slot *slot = hotplug_slot->private; |
| 183 | |
| 184 | *value = cpci_get_attention_status(slot); |
| 185 | return 0; |
| 186 | } |
| 187 | |
| 188 | static int |
| 189 | set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) |
| 190 | { |
| 191 | return cpci_set_attention_status(hotplug_slot->private, status); |
| 192 | } |
| 193 | |
| 194 | static int |
| 195 | get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) |
| 196 | { |
| 197 | *value = hotplug_slot->info->adapter_status; |
| 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | static int |
| 202 | get_latch_status(struct hotplug_slot *hotplug_slot, u8 * value) |
| 203 | { |
| 204 | *value = hotplug_slot->info->latch_status; |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | static void release_slot(struct hotplug_slot *hotplug_slot) |
| 209 | { |
| 210 | struct slot *slot = hotplug_slot->private; |
| 211 | |
| 212 | kfree(slot->hotplug_slot->info); |
| 213 | kfree(slot->hotplug_slot); |
| 214 | if (slot->dev) |
| 215 | pci_dev_put(slot->dev); |
| 216 | kfree(slot); |
| 217 | } |
| 218 | |
| 219 | #define SLOT_NAME_SIZE 6 |
| 220 | |
| 221 | int |
| 222 | cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last) |
| 223 | { |
| 224 | struct slot *slot; |
| 225 | struct hotplug_slot *hotplug_slot; |
| 226 | struct hotplug_slot_info *info; |
| 227 | char name[SLOT_NAME_SIZE]; |
| 228 | int status = -ENOMEM; |
| 229 | int i; |
| 230 | |
| 231 | if (!(controller && bus)) |
| 232 | return -ENODEV; |
| 233 | |
| 234 | /* |
| 235 | * Create a structure for each slot, and register that slot |
| 236 | * with the pci_hotplug subsystem. |
| 237 | */ |
| 238 | for (i = first; i <= last; ++i) { |
| 239 | slot = kzalloc(sizeof (struct slot), GFP_KERNEL); |
| 240 | if (!slot) |
| 241 | goto error; |
| 242 | |
| 243 | hotplug_slot = |
| 244 | kzalloc(sizeof (struct hotplug_slot), GFP_KERNEL); |
| 245 | if (!hotplug_slot) |
| 246 | goto error_slot; |
| 247 | slot->hotplug_slot = hotplug_slot; |
| 248 | |
| 249 | info = kzalloc(sizeof (struct hotplug_slot_info), GFP_KERNEL); |
| 250 | if (!info) |
| 251 | goto error_hpslot; |
| 252 | hotplug_slot->info = info; |
| 253 | |
| 254 | slot->bus = bus; |
| 255 | slot->number = i; |
| 256 | slot->devfn = PCI_DEVFN(i, 0); |
| 257 | |
| 258 | snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i); |
| 259 | |
| 260 | hotplug_slot->private = slot; |
| 261 | hotplug_slot->release = &release_slot; |
| 262 | hotplug_slot->ops = &cpci_hotplug_slot_ops; |
| 263 | |
| 264 | /* |
| 265 | * Initialize the slot info structure with some known |
| 266 | * good values. |
| 267 | */ |
| 268 | dbg("initializing slot %s", name); |
| 269 | info->power_status = cpci_get_power_status(slot); |
| 270 | info->attention_status = cpci_get_attention_status(slot); |
| 271 | |
| 272 | dbg("registering slot %s", name); |
| 273 | status = pci_hp_register(slot->hotplug_slot, bus, i, name); |
| 274 | if (status) { |
| 275 | err("pci_hp_register failed with error %d", status); |
| 276 | goto error_info; |
| 277 | } |
| 278 | dbg("slot registered with name: %s", slot_name(slot)); |
| 279 | |
| 280 | /* Add slot to our internal list */ |
| 281 | down_write(&list_rwsem); |
| 282 | list_add(&slot->slot_list, &slot_list); |
| 283 | slots++; |
| 284 | up_write(&list_rwsem); |
| 285 | } |
| 286 | return 0; |
| 287 | error_info: |
| 288 | kfree(info); |
| 289 | error_hpslot: |
| 290 | kfree(hotplug_slot); |
| 291 | error_slot: |
| 292 | kfree(slot); |
| 293 | error: |
| 294 | return status; |
| 295 | } |
| 296 | |
| 297 | int |
| 298 | cpci_hp_unregister_bus(struct pci_bus *bus) |
| 299 | { |
| 300 | struct slot *slot; |
| 301 | struct slot *tmp; |
| 302 | int status = 0; |
| 303 | |
| 304 | down_write(&list_rwsem); |
| 305 | if (!slots) { |
| 306 | up_write(&list_rwsem); |
| 307 | return -1; |
| 308 | } |
| 309 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { |
| 310 | if (slot->bus == bus) { |
| 311 | list_del(&slot->slot_list); |
| 312 | slots--; |
| 313 | |
| 314 | dbg("deregistering slot %s", slot_name(slot)); |
| 315 | status = pci_hp_deregister(slot->hotplug_slot); |
| 316 | if (status) { |
| 317 | err("pci_hp_deregister failed with error %d", |
| 318 | status); |
| 319 | break; |
| 320 | } |
| 321 | } |
| 322 | } |
| 323 | up_write(&list_rwsem); |
| 324 | return status; |
| 325 | } |
| 326 | |
| 327 | /* This is the interrupt mode interrupt handler */ |
| 328 | static irqreturn_t |
| 329 | cpci_hp_intr(int irq, void *data) |
| 330 | { |
| 331 | dbg("entered cpci_hp_intr"); |
| 332 | |
| 333 | /* Check to see if it was our interrupt */ |
| 334 | if ((controller->irq_flags & IRQF_SHARED) && |
| 335 | !controller->ops->check_irq(controller->dev_id)) { |
| 336 | dbg("exited cpci_hp_intr, not our interrupt"); |
| 337 | return IRQ_NONE; |
| 338 | } |
| 339 | |
| 340 | /* Disable ENUM interrupt */ |
| 341 | controller->ops->disable_irq(); |
| 342 | |
| 343 | /* Trigger processing by the event thread */ |
| 344 | wake_up_process(cpci_thread); |
| 345 | return IRQ_HANDLED; |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * According to PICMG 2.1 R2.0, section 6.3.2, upon |
| 350 | * initialization, the system driver shall clear the |
| 351 | * INS bits of the cold-inserted devices. |
| 352 | */ |
| 353 | static int |
| 354 | init_slots(int clear_ins) |
| 355 | { |
| 356 | struct slot *slot; |
| 357 | struct pci_dev* dev; |
| 358 | |
| 359 | dbg("%s - enter", __func__); |
| 360 | down_read(&list_rwsem); |
| 361 | if (!slots) { |
| 362 | up_read(&list_rwsem); |
| 363 | return -1; |
| 364 | } |
| 365 | list_for_each_entry(slot, &slot_list, slot_list) { |
| 366 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
| 367 | if (clear_ins && cpci_check_and_clear_ins(slot)) |
| 368 | dbg("%s - cleared INS for slot %s", |
| 369 | __func__, slot_name(slot)); |
| 370 | dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0)); |
| 371 | if (dev) { |
| 372 | if (update_adapter_status(slot->hotplug_slot, 1)) |
| 373 | warn("failure to update adapter file"); |
| 374 | if (update_latch_status(slot->hotplug_slot, 1)) |
| 375 | warn("failure to update latch file"); |
| 376 | slot->dev = dev; |
| 377 | } |
| 378 | } |
| 379 | up_read(&list_rwsem); |
| 380 | dbg("%s - exit", __func__); |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | static int |
| 385 | check_slots(void) |
| 386 | { |
| 387 | struct slot *slot; |
| 388 | int extracted; |
| 389 | int inserted; |
| 390 | u16 hs_csr; |
| 391 | |
| 392 | down_read(&list_rwsem); |
| 393 | if (!slots) { |
| 394 | up_read(&list_rwsem); |
| 395 | err("no slots registered, shutting down"); |
| 396 | return -1; |
| 397 | } |
| 398 | extracted = inserted = 0; |
| 399 | list_for_each_entry(slot, &slot_list, slot_list) { |
| 400 | dbg("%s - looking at slot %s", __func__, slot_name(slot)); |
| 401 | if (cpci_check_and_clear_ins(slot)) { |
| 402 | /* |
| 403 | * Some broken hardware (e.g. PLX 9054AB) asserts |
| 404 | * ENUM# twice... |
| 405 | */ |
| 406 | if (slot->dev) { |
| 407 | warn("slot %s already inserted", |
| 408 | slot_name(slot)); |
| 409 | inserted++; |
| 410 | continue; |
| 411 | } |
| 412 | |
| 413 | /* Process insertion */ |
| 414 | dbg("%s - slot %s inserted", __func__, slot_name(slot)); |
| 415 | |
| 416 | /* GSM, debug */ |
| 417 | hs_csr = cpci_get_hs_csr(slot); |
| 418 | dbg("%s - slot %s HS_CSR (1) = %04x", |
| 419 | __func__, slot_name(slot), hs_csr); |
| 420 | |
| 421 | /* Configure device */ |
| 422 | dbg("%s - configuring slot %s", |
| 423 | __func__, slot_name(slot)); |
| 424 | if (cpci_configure_slot(slot)) { |
| 425 | err("%s - could not configure slot %s", |
| 426 | __func__, slot_name(slot)); |
| 427 | continue; |
| 428 | } |
| 429 | dbg("%s - finished configuring slot %s", |
| 430 | __func__, slot_name(slot)); |
| 431 | |
| 432 | /* GSM, debug */ |
| 433 | hs_csr = cpci_get_hs_csr(slot); |
| 434 | dbg("%s - slot %s HS_CSR (2) = %04x", |
| 435 | __func__, slot_name(slot), hs_csr); |
| 436 | |
| 437 | if (update_latch_status(slot->hotplug_slot, 1)) |
| 438 | warn("failure to update latch file"); |
| 439 | |
| 440 | if (update_adapter_status(slot->hotplug_slot, 1)) |
| 441 | warn("failure to update adapter file"); |
| 442 | |
| 443 | cpci_led_off(slot); |
| 444 | |
| 445 | /* GSM, debug */ |
| 446 | hs_csr = cpci_get_hs_csr(slot); |
| 447 | dbg("%s - slot %s HS_CSR (3) = %04x", |
| 448 | __func__, slot_name(slot), hs_csr); |
| 449 | |
| 450 | inserted++; |
| 451 | } else if (cpci_check_ext(slot)) { |
| 452 | /* Process extraction request */ |
| 453 | dbg("%s - slot %s extracted", |
| 454 | __func__, slot_name(slot)); |
| 455 | |
| 456 | /* GSM, debug */ |
| 457 | hs_csr = cpci_get_hs_csr(slot); |
| 458 | dbg("%s - slot %s HS_CSR = %04x", |
| 459 | __func__, slot_name(slot), hs_csr); |
| 460 | |
| 461 | if (!slot->extracting) { |
| 462 | if (update_latch_status(slot->hotplug_slot, 0)) { |
| 463 | warn("failure to update latch file"); |
| 464 | } |
| 465 | slot->extracting = 1; |
| 466 | atomic_inc(&extracting); |
| 467 | } |
| 468 | extracted++; |
| 469 | } else if (slot->extracting) { |
| 470 | hs_csr = cpci_get_hs_csr(slot); |
| 471 | if (hs_csr == 0xffff) { |
| 472 | /* |
| 473 | * Hmmm, we're likely hosed at this point, should we |
| 474 | * bother trying to tell the driver or not? |
| 475 | */ |
| 476 | err("card in slot %s was improperly removed", |
| 477 | slot_name(slot)); |
| 478 | if (update_adapter_status(slot->hotplug_slot, 0)) |
| 479 | warn("failure to update adapter file"); |
| 480 | slot->extracting = 0; |
| 481 | atomic_dec(&extracting); |
| 482 | } |
| 483 | } |
| 484 | } |
| 485 | up_read(&list_rwsem); |
| 486 | dbg("inserted=%d, extracted=%d, extracting=%d", |
| 487 | inserted, extracted, atomic_read(&extracting)); |
| 488 | if (inserted || extracted) |
| 489 | return extracted; |
| 490 | else if (!atomic_read(&extracting)) { |
| 491 | err("cannot find ENUM# source, shutting down"); |
| 492 | return -1; |
| 493 | } |
| 494 | return 0; |
| 495 | } |
| 496 | |
| 497 | /* This is the interrupt mode worker thread body */ |
| 498 | static int |
| 499 | event_thread(void *data) |
| 500 | { |
| 501 | int rc; |
| 502 | |
| 503 | dbg("%s - event thread started", __func__); |
| 504 | while (1) { |
| 505 | dbg("event thread sleeping"); |
| 506 | set_current_state(TASK_INTERRUPTIBLE); |
| 507 | schedule(); |
| 508 | if (kthread_should_stop()) |
| 509 | break; |
| 510 | do { |
| 511 | rc = check_slots(); |
| 512 | if (rc > 0) { |
| 513 | /* Give userspace a chance to handle extraction */ |
| 514 | msleep(500); |
| 515 | } else if (rc < 0) { |
| 516 | dbg("%s - error checking slots", __func__); |
| 517 | thread_finished = 1; |
| 518 | goto out; |
| 519 | } |
| 520 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
| 521 | if (kthread_should_stop()) |
| 522 | break; |
| 523 | |
| 524 | /* Re-enable ENUM# interrupt */ |
| 525 | dbg("%s - re-enabling irq", __func__); |
| 526 | controller->ops->enable_irq(); |
| 527 | } |
| 528 | out: |
| 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | /* This is the polling mode worker thread body */ |
| 533 | static int |
| 534 | poll_thread(void *data) |
| 535 | { |
| 536 | int rc; |
| 537 | |
| 538 | while (1) { |
| 539 | if (kthread_should_stop() || signal_pending(current)) |
| 540 | break; |
| 541 | if (controller->ops->query_enum()) { |
| 542 | do { |
| 543 | rc = check_slots(); |
| 544 | if (rc > 0) { |
| 545 | /* Give userspace a chance to handle extraction */ |
| 546 | msleep(500); |
| 547 | } else if (rc < 0) { |
| 548 | dbg("%s - error checking slots", __func__); |
| 549 | thread_finished = 1; |
| 550 | goto out; |
| 551 | } |
| 552 | } while (atomic_read(&extracting) && !kthread_should_stop()); |
| 553 | } |
| 554 | msleep(100); |
| 555 | } |
| 556 | out: |
| 557 | return 0; |
| 558 | } |
| 559 | |
| 560 | static int |
| 561 | cpci_start_thread(void) |
| 562 | { |
| 563 | if (controller->irq) |
| 564 | cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd"); |
| 565 | else |
| 566 | cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld"); |
| 567 | if (IS_ERR(cpci_thread)) { |
| 568 | err("Can't start up our thread"); |
| 569 | return PTR_ERR(cpci_thread); |
| 570 | } |
| 571 | thread_finished = 0; |
| 572 | return 0; |
| 573 | } |
| 574 | |
| 575 | static void |
| 576 | cpci_stop_thread(void) |
| 577 | { |
| 578 | kthread_stop(cpci_thread); |
| 579 | thread_finished = 1; |
| 580 | } |
| 581 | |
| 582 | int |
| 583 | cpci_hp_register_controller(struct cpci_hp_controller *new_controller) |
| 584 | { |
| 585 | int status = 0; |
| 586 | |
| 587 | if (controller) |
| 588 | return -1; |
| 589 | if (!(new_controller && new_controller->ops)) |
| 590 | return -EINVAL; |
| 591 | if (new_controller->irq) { |
| 592 | if (!(new_controller->ops->enable_irq && |
| 593 | new_controller->ops->disable_irq)) |
| 594 | status = -EINVAL; |
| 595 | if (request_irq(new_controller->irq, |
| 596 | cpci_hp_intr, |
| 597 | new_controller->irq_flags, |
| 598 | MY_NAME, |
| 599 | new_controller->dev_id)) { |
| 600 | err("Can't get irq %d for the hotplug cPCI controller", |
| 601 | new_controller->irq); |
| 602 | status = -ENODEV; |
| 603 | } |
| 604 | dbg("%s - acquired controller irq %d", |
| 605 | __func__, new_controller->irq); |
| 606 | } |
| 607 | if (!status) |
| 608 | controller = new_controller; |
| 609 | return status; |
| 610 | } |
| 611 | |
| 612 | static void |
| 613 | cleanup_slots(void) |
| 614 | { |
| 615 | struct slot *slot; |
| 616 | struct slot *tmp; |
| 617 | |
| 618 | /* |
| 619 | * Unregister all of our slots with the pci_hotplug subsystem, |
| 620 | * and free up all memory that we had allocated. |
| 621 | */ |
| 622 | down_write(&list_rwsem); |
| 623 | if (!slots) |
| 624 | goto cleanup_null; |
| 625 | list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) { |
| 626 | list_del(&slot->slot_list); |
| 627 | pci_hp_deregister(slot->hotplug_slot); |
| 628 | } |
| 629 | cleanup_null: |
| 630 | up_write(&list_rwsem); |
| 631 | return; |
| 632 | } |
| 633 | |
| 634 | int |
| 635 | cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller) |
| 636 | { |
| 637 | int status = 0; |
| 638 | |
| 639 | if (controller) { |
| 640 | if (!thread_finished) |
| 641 | cpci_stop_thread(); |
| 642 | if (controller->irq) |
| 643 | free_irq(controller->irq, controller->dev_id); |
| 644 | controller = NULL; |
| 645 | cleanup_slots(); |
| 646 | } else |
| 647 | status = -ENODEV; |
| 648 | return status; |
| 649 | } |
| 650 | |
| 651 | int |
| 652 | cpci_hp_start(void) |
| 653 | { |
| 654 | static int first = 1; |
| 655 | int status; |
| 656 | |
| 657 | dbg("%s - enter", __func__); |
| 658 | if (!controller) |
| 659 | return -ENODEV; |
| 660 | |
| 661 | down_read(&list_rwsem); |
| 662 | if (list_empty(&slot_list)) { |
| 663 | up_read(&list_rwsem); |
| 664 | return -ENODEV; |
| 665 | } |
| 666 | up_read(&list_rwsem); |
| 667 | |
| 668 | status = init_slots(first); |
| 669 | if (first) |
| 670 | first = 0; |
| 671 | if (status) |
| 672 | return status; |
| 673 | |
| 674 | status = cpci_start_thread(); |
| 675 | if (status) |
| 676 | return status; |
| 677 | dbg("%s - thread started", __func__); |
| 678 | |
| 679 | if (controller->irq) { |
| 680 | /* Start enum interrupt processing */ |
| 681 | dbg("%s - enabling irq", __func__); |
| 682 | controller->ops->enable_irq(); |
| 683 | } |
| 684 | dbg("%s - exit", __func__); |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | int |
| 689 | cpci_hp_stop(void) |
| 690 | { |
| 691 | if (!controller) |
| 692 | return -ENODEV; |
| 693 | if (controller->irq) { |
| 694 | /* Stop enum interrupt processing */ |
| 695 | dbg("%s - disabling irq", __func__); |
| 696 | controller->ops->disable_irq(); |
| 697 | } |
| 698 | cpci_stop_thread(); |
| 699 | return 0; |
| 700 | } |
| 701 | |
| 702 | int __init |
| 703 | cpci_hotplug_init(int debug) |
| 704 | { |
| 705 | cpci_debug = debug; |
| 706 | return 0; |
| 707 | } |
| 708 | |
| 709 | void __exit |
| 710 | cpci_hotplug_exit(void) |
| 711 | { |
| 712 | /* |
| 713 | * Clean everything up. |
| 714 | */ |
| 715 | cpci_hp_stop(); |
| 716 | cpci_hp_unregister_controller(controller); |
| 717 | } |
| 718 | |
| 719 | EXPORT_SYMBOL_GPL(cpci_hp_register_controller); |
| 720 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller); |
| 721 | EXPORT_SYMBOL_GPL(cpci_hp_register_bus); |
| 722 | EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus); |
| 723 | EXPORT_SYMBOL_GPL(cpci_hp_start); |
| 724 | EXPORT_SYMBOL_GPL(cpci_hp_stop); |