Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ACPI PCI Hot Plug Controller Driver |
| 3 | * |
| 4 | * Copyright (C) 1995,2001 Compaq Computer Corporation |
| 5 | * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) |
| 6 | * Copyright (C) 2001 IBM Corp. |
| 7 | * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) |
| 8 | * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) |
| 9 | * Copyright (C) 2002,2003 NEC Corporation |
Rajesh Shah | 42f49a6 | 2005-04-28 00:25:53 -0700 | [diff] [blame] | 10 | * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com) |
| 11 | * Copyright (C) 2003-2005 Hewlett Packard |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * |
| 13 | * All rights reserved. |
| 14 | * |
| 15 | * This program is free software; you can redistribute it and/or modify |
| 16 | * it under the terms of the GNU General Public License as published by |
| 17 | * the Free Software Foundation; either version 2 of the License, or (at |
| 18 | * your option) any later version. |
| 19 | * |
| 20 | * This program is distributed in the hope that it will be useful, but |
| 21 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 22 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 23 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 24 | * details. |
| 25 | * |
| 26 | * You should have received a copy of the GNU General Public License |
| 27 | * along with this program; if not, write to the Free Software |
| 28 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 29 | * |
Kristen Carlson Accardi | 998be20 | 2006-07-26 10:52:33 -0700 | [diff] [blame^] | 30 | * Send feedback to <kristen.c.accardi@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | * |
| 32 | */ |
| 33 | |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/moduleparam.h> |
| 37 | |
| 38 | #include <linux/kernel.h> |
| 39 | #include <linux/pci.h> |
| 40 | #include <linux/slab.h> |
| 41 | #include <linux/smp.h> |
| 42 | #include <linux/smp_lock.h> |
| 43 | #include "pci_hotplug.h" |
| 44 | #include "acpiphp.h" |
| 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #define MY_NAME "acpiphp" |
| 47 | |
| 48 | static int debug; |
| 49 | int acpiphp_debug; |
| 50 | |
| 51 | /* local variables */ |
| 52 | static int num_slots; |
| 53 | static struct acpiphp_attention_info *attention_info; |
| 54 | |
Rajesh Shah | 42f49a6 | 2005-04-28 00:25:53 -0700 | [diff] [blame] | 55 | #define DRIVER_VERSION "0.5" |
| 56 | #define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@us.ibm.com>, Takayoshi Kochi <t-kochi@bq.jp.nec.com>, Matthew Wilcox <willy@hp.com>" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | #define DRIVER_DESC "ACPI Hot Plug PCI Controller Driver" |
| 58 | |
| 59 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 60 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 61 | MODULE_LICENSE("GPL"); |
| 62 | MODULE_PARM_DESC(debug, "Debugging mode enabled or not"); |
| 63 | module_param(debug, bool, 0644); |
| 64 | |
| 65 | /* export the attention callback registration methods */ |
| 66 | EXPORT_SYMBOL_GPL(acpiphp_register_attention); |
| 67 | EXPORT_SYMBOL_GPL(acpiphp_unregister_attention); |
| 68 | |
| 69 | static int enable_slot (struct hotplug_slot *slot); |
| 70 | static int disable_slot (struct hotplug_slot *slot); |
| 71 | static int set_attention_status (struct hotplug_slot *slot, u8 value); |
| 72 | static int get_power_status (struct hotplug_slot *slot, u8 *value); |
| 73 | static int get_attention_status (struct hotplug_slot *slot, u8 *value); |
| 74 | static int get_address (struct hotplug_slot *slot, u32 *value); |
| 75 | static int get_latch_status (struct hotplug_slot *slot, u8 *value); |
| 76 | static int get_adapter_status (struct hotplug_slot *slot, u8 *value); |
| 77 | |
| 78 | static struct hotplug_slot_ops acpi_hotplug_slot_ops = { |
| 79 | .owner = THIS_MODULE, |
| 80 | .enable_slot = enable_slot, |
| 81 | .disable_slot = disable_slot, |
| 82 | .set_attention_status = set_attention_status, |
| 83 | .get_power_status = get_power_status, |
| 84 | .get_attention_status = get_attention_status, |
| 85 | .get_latch_status = get_latch_status, |
| 86 | .get_adapter_status = get_adapter_status, |
| 87 | .get_address = get_address, |
| 88 | }; |
| 89 | |
| 90 | |
| 91 | /** |
| 92 | * acpiphp_register_attention - set attention LED callback |
| 93 | * @info: must be completely filled with LED callbacks |
| 94 | * |
| 95 | * Description: this is used to register a hardware specific ACPI |
| 96 | * driver that manipulates the attention LED. All the fields in |
| 97 | * info must be set. |
| 98 | **/ |
| 99 | int acpiphp_register_attention(struct acpiphp_attention_info *info) |
| 100 | { |
| 101 | int retval = -EINVAL; |
| 102 | |
| 103 | if (info && info->owner && info->set_attn && |
| 104 | info->get_attn && !attention_info) { |
| 105 | retval = 0; |
| 106 | attention_info = info; |
| 107 | } |
| 108 | return retval; |
| 109 | } |
| 110 | |
| 111 | |
| 112 | /** |
| 113 | * acpiphp_unregister_attention - unset attention LED callback |
| 114 | * @info: must match the pointer used to register |
| 115 | * |
| 116 | * Description: this is used to un-register a hardware specific acpi |
| 117 | * driver that manipulates the attention LED. The pointer to the |
| 118 | * info struct must be the same as the one used to set it. |
| 119 | **/ |
| 120 | int acpiphp_unregister_attention(struct acpiphp_attention_info *info) |
| 121 | { |
| 122 | int retval = -EINVAL; |
| 123 | |
| 124 | if (info && attention_info == info) { |
| 125 | attention_info = NULL; |
| 126 | retval = 0; |
| 127 | } |
| 128 | return retval; |
| 129 | } |
| 130 | |
| 131 | |
| 132 | /** |
| 133 | * enable_slot - power on and enable a slot |
| 134 | * @hotplug_slot: slot to enable |
| 135 | * |
| 136 | * Actual tasks are done in acpiphp_enable_slot() |
| 137 | * |
| 138 | */ |
| 139 | static int enable_slot(struct hotplug_slot *hotplug_slot) |
| 140 | { |
| 141 | struct slot *slot = hotplug_slot->private; |
| 142 | |
| 143 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); |
| 144 | |
| 145 | /* enable the specified slot */ |
| 146 | return acpiphp_enable_slot(slot->acpi_slot); |
| 147 | } |
| 148 | |
| 149 | |
| 150 | /** |
| 151 | * disable_slot - disable and power off a slot |
| 152 | * @hotplug_slot: slot to disable |
| 153 | * |
| 154 | * Actual tasks are done in acpiphp_disable_slot() |
| 155 | * |
| 156 | */ |
| 157 | static int disable_slot(struct hotplug_slot *hotplug_slot) |
| 158 | { |
| 159 | struct slot *slot = hotplug_slot->private; |
| 160 | |
| 161 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); |
| 162 | |
| 163 | /* disable the specified slot */ |
| 164 | return acpiphp_disable_slot(slot->acpi_slot); |
| 165 | } |
| 166 | |
| 167 | |
| 168 | /** |
| 169 | * set_attention_status - set attention LED |
| 170 | * @hotplug_slot: slot to set attention LED on |
| 171 | * @status: value to set attention LED to (0 or 1) |
| 172 | * |
| 173 | * attention status LED, so we use a callback that |
| 174 | * was registered with us. This allows hardware specific |
| 175 | * ACPI implementations to blink the light for us. |
| 176 | **/ |
| 177 | static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) |
| 178 | { |
| 179 | int retval = -ENODEV; |
| 180 | |
| 181 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); |
| 182 | |
| 183 | if (attention_info && try_module_get(attention_info->owner)) { |
| 184 | retval = attention_info->set_attn(hotplug_slot, status); |
| 185 | module_put(attention_info->owner); |
| 186 | } else |
| 187 | attention_info = NULL; |
| 188 | return retval; |
| 189 | } |
| 190 | |
| 191 | |
| 192 | /** |
| 193 | * get_power_status - get power status of a slot |
| 194 | * @hotplug_slot: slot to get status |
| 195 | * @value: pointer to store status |
| 196 | * |
| 197 | * Some platforms may not implement _STA method properly. |
| 198 | * In that case, the value returned may not be reliable. |
| 199 | * |
| 200 | */ |
| 201 | static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) |
| 202 | { |
| 203 | struct slot *slot = hotplug_slot->private; |
| 204 | |
| 205 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); |
| 206 | |
| 207 | *value = acpiphp_get_power_status(slot->acpi_slot); |
| 208 | |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | |
| 213 | /** |
| 214 | * get_attention_status - get attention LED status |
| 215 | * @hotplug_slot: slot to get status from |
| 216 | * @value: returns with value of attention LED |
| 217 | * |
| 218 | * ACPI doesn't have known method to determine the state |
| 219 | * of the attention status LED, so we use a callback that |
| 220 | * was registered with us. This allows hardware specific |
| 221 | * ACPI implementations to determine its state |
| 222 | **/ |
| 223 | static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) |
| 224 | { |
| 225 | int retval = -EINVAL; |
| 226 | |
| 227 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); |
| 228 | |
| 229 | if (attention_info && try_module_get(attention_info->owner)) { |
| 230 | retval = attention_info->get_attn(hotplug_slot, value); |
| 231 | module_put(attention_info->owner); |
| 232 | } else |
| 233 | attention_info = NULL; |
| 234 | return retval; |
| 235 | } |
| 236 | |
| 237 | |
| 238 | /** |
| 239 | * get_latch_status - get latch status of a slot |
| 240 | * @hotplug_slot: slot to get status |
| 241 | * @value: pointer to store status |
| 242 | * |
| 243 | * ACPI doesn't provide any formal means to access latch status. |
| 244 | * Instead, we fake latch status from _STA |
| 245 | * |
| 246 | */ |
| 247 | static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) |
| 248 | { |
| 249 | struct slot *slot = hotplug_slot->private; |
| 250 | |
| 251 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); |
| 252 | |
| 253 | *value = acpiphp_get_latch_status(slot->acpi_slot); |
| 254 | |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | |
| 259 | /** |
| 260 | * get_adapter_status - get adapter status of a slot |
| 261 | * @hotplug_slot: slot to get status |
| 262 | * @value: pointer to store status |
| 263 | * |
| 264 | * ACPI doesn't provide any formal means to access adapter status. |
| 265 | * Instead, we fake adapter status from _STA |
| 266 | * |
| 267 | */ |
| 268 | static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) |
| 269 | { |
| 270 | struct slot *slot = hotplug_slot->private; |
| 271 | |
| 272 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); |
| 273 | |
| 274 | *value = acpiphp_get_adapter_status(slot->acpi_slot); |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | |
| 280 | /** |
| 281 | * get_address - get pci address of a slot |
| 282 | * @hotplug_slot: slot to get status |
Rajesh Shah | 42f49a6 | 2005-04-28 00:25:53 -0700 | [diff] [blame] | 283 | * @value: pointer to struct pci_busdev (seg, bus, dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | */ |
| 285 | static int get_address(struct hotplug_slot *hotplug_slot, u32 *value) |
| 286 | { |
| 287 | struct slot *slot = hotplug_slot->private; |
| 288 | |
| 289 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); |
| 290 | |
| 291 | *value = acpiphp_get_address(slot->acpi_slot); |
| 292 | |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | static int __init init_acpi(void) |
| 297 | { |
| 298 | int retval; |
| 299 | |
| 300 | /* initialize internal data structure etc. */ |
| 301 | retval = acpiphp_glue_init(); |
| 302 | |
| 303 | /* read initial number of slots */ |
| 304 | if (!retval) { |
| 305 | num_slots = acpiphp_get_num_slots(); |
| 306 | if (num_slots == 0) |
| 307 | retval = -ENODEV; |
| 308 | } |
| 309 | |
| 310 | return retval; |
| 311 | } |
| 312 | |
| 313 | |
| 314 | /** |
| 315 | * make_slot_name - make a slot name that appears in pcihpfs |
| 316 | * @slot: slot to name |
| 317 | * |
| 318 | */ |
| 319 | static void make_slot_name(struct slot *slot) |
| 320 | { |
| 321 | snprintf(slot->hotplug_slot->name, SLOT_NAME_SIZE, "%u", |
| 322 | slot->acpi_slot->sun); |
| 323 | } |
| 324 | |
| 325 | /** |
| 326 | * release_slot - free up the memory used by a slot |
| 327 | * @hotplug_slot: slot to free |
| 328 | */ |
| 329 | static void release_slot(struct hotplug_slot *hotplug_slot) |
| 330 | { |
| 331 | struct slot *slot = hotplug_slot->private; |
| 332 | |
| 333 | dbg("%s - physical_slot = %s\n", __FUNCTION__, hotplug_slot->name); |
| 334 | |
| 335 | kfree(slot->hotplug_slot->info); |
| 336 | kfree(slot->hotplug_slot->name); |
| 337 | kfree(slot->hotplug_slot); |
| 338 | kfree(slot); |
| 339 | } |
| 340 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 341 | /* callback routine to initialize 'struct slot' for each slot */ |
| 342 | int acpiphp_register_hotplug_slot(struct acpiphp_slot *acpiphp_slot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
| 344 | struct slot *slot; |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 345 | struct hotplug_slot *hotplug_slot; |
| 346 | struct hotplug_slot_info *hotplug_slot_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | int retval = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 349 | slot = kzalloc(sizeof(*slot), GFP_KERNEL); |
| 350 | if (!slot) |
| 351 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 353 | slot->hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL); |
| 354 | if (!slot->hotplug_slot) |
| 355 | goto error_slot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 357 | slot->hotplug_slot->info = kzalloc(sizeof(*hotplug_slot_info), |
| 358 | GFP_KERNEL); |
| 359 | if (!slot->hotplug_slot->info) |
| 360 | goto error_hpslot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 362 | slot->hotplug_slot->name = kzalloc(SLOT_NAME_SIZE, GFP_KERNEL); |
| 363 | if (!slot->hotplug_slot->name) |
| 364 | goto error_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 366 | slot->hotplug_slot->private = slot; |
| 367 | slot->hotplug_slot->release = &release_slot; |
| 368 | slot->hotplug_slot->ops = &acpi_hotplug_slot_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 370 | slot->acpi_slot = acpiphp_slot; |
| 371 | slot->hotplug_slot->info->power_status = acpiphp_get_power_status(slot->acpi_slot); |
| 372 | slot->hotplug_slot->info->attention_status = 0; |
| 373 | slot->hotplug_slot->info->latch_status = acpiphp_get_latch_status(slot->acpi_slot); |
| 374 | slot->hotplug_slot->info->adapter_status = acpiphp_get_adapter_status(slot->acpi_slot); |
| 375 | slot->hotplug_slot->info->max_bus_speed = PCI_SPEED_UNKNOWN; |
| 376 | slot->hotplug_slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 378 | acpiphp_slot->slot = slot; |
| 379 | make_slot_name(slot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 381 | retval = pci_hp_register(slot->hotplug_slot); |
| 382 | if (retval) { |
| 383 | err("pci_hp_register failed with error %d\n", retval); |
| 384 | goto error_name; |
| 385 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 387 | info("Slot [%s] registered\n", slot->hotplug_slot->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
| 389 | return 0; |
| 390 | error_name: |
| 391 | kfree(slot->hotplug_slot->name); |
| 392 | error_info: |
| 393 | kfree(slot->hotplug_slot->info); |
| 394 | error_hpslot: |
| 395 | kfree(slot->hotplug_slot); |
| 396 | error_slot: |
| 397 | kfree(slot); |
| 398 | error: |
| 399 | return retval; |
| 400 | } |
| 401 | |
| 402 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 403 | void acpiphp_unregister_hotplug_slot(struct acpiphp_slot *acpiphp_slot) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | { |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 405 | struct slot *slot = acpiphp_slot->slot; |
| 406 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
MUNEDA Takahiro | e27da38 | 2006-02-23 17:56:08 -0800 | [diff] [blame] | 408 | info ("Slot [%s] unregistered\n", slot->hotplug_slot->name); |
| 409 | |
| 410 | retval = pci_hp_deregister(slot->hotplug_slot); |
| 411 | if (retval) |
| 412 | err("pci_hp_deregister failed with error %d\n", retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | |
| 416 | static int __init acpiphp_init(void) |
| 417 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); |
| 419 | |
| 420 | acpiphp_debug = debug; |
| 421 | |
| 422 | /* read all the ACPI info from the system */ |
Kristen Accardi | 4e8662b | 2006-06-28 03:08:06 -0400 | [diff] [blame] | 423 | return init_acpi(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
| 425 | |
| 426 | |
| 427 | static void __exit acpiphp_exit(void) |
| 428 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | /* deallocate internal data structures etc. */ |
| 430 | acpiphp_glue_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | module_init(acpiphp_init); |
| 434 | module_exit(acpiphp_exit); |