1 /* 2 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. 3 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> 4 * 5 * All rights reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or (at 10 * your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 15 * NON INFRINGEMENT. See the GNU General Public License for more 16 * details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * 22 * Send feedback to <lxie@us.ibm.com> 23 * 24 */ 25 #include <linux/kernel.h> 26 #include <linux/module.h> 27 #include <linux/moduleparam.h> 28 #include <linux/pci.h> 29 #include <linux/slab.h> 30 #include <linux/smp.h> 31 #include <linux/smp_lock.h> 32 #include <linux/init.h> 33 #include <asm/eeh.h> /* for eeh_add_device() */ 34 #include <asm/rtas.h> /* rtas_call */ 35 #include <asm/pci-bridge.h> /* for pci_controller */ 36 #include "../pci.h" /* for pci_add_new_bus */ 37 /* and pci_do_scan_bus */ 38 #include "rpaphp.h" 39 #include "pci_hotplug.h" 40 41 int debug; 42 static struct semaphore rpaphp_sem; 43 LIST_HEAD(rpaphp_slot_head); 44 int num_slots; 45 46 #define DRIVER_VERSION "0.1" 47 #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>" 48 #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver" 49 50 #define MAX_LOC_CODE 128 51 52 MODULE_AUTHOR(DRIVER_AUTHOR); 53 MODULE_DESCRIPTION(DRIVER_DESC); 54 MODULE_LICENSE("GPL"); 55 56 module_param(debug, bool, 0644); 57 58 static int rpaphp_get_attention_status(struct slot *slot) 59 { 60 return slot->hotplug_slot->info->attention_status; 61 } 62 63 /** 64 * set_attention_status - set attention LED 65 * echo 0 > attention -- set LED OFF 66 * echo 1 > attention -- set LED ON 67 * echo 2 > attention -- set LED ID(identify, light is blinking) 68 * 69 */ 70 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) 71 { 72 int retval = 0; 73 struct slot *slot = (struct slot *)hotplug_slot->private; 74 75 down(&rpaphp_sem); 76 switch (value) { 77 case 0: 78 retval = rpaphp_set_attention_status(slot, LED_OFF); 79 hotplug_slot->info->attention_status = 0; 80 break; 81 case 1: 82 default: 83 retval = rpaphp_set_attention_status(slot, LED_ON); 84 hotplug_slot->info->attention_status = 1; 85 break; 86 case 2: 87 retval = rpaphp_set_attention_status(slot, LED_ID); 88 hotplug_slot->info->attention_status = 2; 89 break; 90 } 91 up(&rpaphp_sem); 92 return retval; 93 } 94 95 /** 96 * get_power_status - get power status of a slot 97 * @hotplug_slot: slot to get status 98 * @value: pointer to store status 99 * 100 * 101 */ 102 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 * value) 103 { 104 int retval; 105 struct slot *slot = (struct slot *)hotplug_slot->private; 106 107 down(&rpaphp_sem); 108 retval = rpaphp_get_power_status(slot, value); 109 up(&rpaphp_sem); 110 return retval; 111 } 112 113 /** 114 * get_attention_status - get attention LED status 115 * 116 * 117 */ 118 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 * value) 119 { 120 int retval = 0; 121 struct slot *slot = (struct slot *)hotplug_slot->private; 122 123 down(&rpaphp_sem); 124 *value = rpaphp_get_attention_status(slot); 125 up(&rpaphp_sem); 126 return retval; 127 } 128 129 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 * value) 130 { 131 struct slot *slot = (struct slot *)hotplug_slot->private; 132 int retval = 0; 133 134 down(&rpaphp_sem); 135 retval = rpaphp_get_pci_adapter_status(slot, 0, value); 136 up(&rpaphp_sem); 137 return retval; 138 } 139 140 static int get_max_bus_speed(struct hotplug_slot *hotplug_slot, enum pci_bus_speed *value) 141 { 142 struct slot *slot = (struct slot *)hotplug_slot->private; 143 144 down(&rpaphp_sem); 145 switch (slot->type) { 146 case 1: 147 case 2: 148 case 3: 149 case 4: 150 case 5: 151 case 6: 152 *value = PCI_SPEED_33MHz; /* speed for case 1-6 */ 153 break; 154 case 7: 155 case 8: 156 *value = PCI_SPEED_66MHz; 157 break; 158 case 11: 159 case 14: 160 *value = PCI_SPEED_66MHz_PCIX; 161 break; 162 case 12: 163 case 15: 164 *value = PCI_SPEED_100MHz_PCIX; 165 break; 166 case 13: 167 case 16: 168 *value = PCI_SPEED_133MHz_PCIX; 169 break; 170 default: 171 *value = PCI_SPEED_UNKNOWN; 172 break; 173 174 } 175 up(&rpaphp_sem); 176 return 0; 177 } 178 179 static int get_children_props(struct device_node *dn, int **drc_indexes, 180 int **drc_names, int **drc_types, int **drc_power_domains) 181 { 182 int *indexes, *names; 183 int *types, *domains; 184 185 indexes = (int *) get_property(dn, "ibm,drc-indexes", NULL); 186 names = (int *) get_property(dn, "ibm,drc-names", NULL); 187 types = (int *) get_property(dn, "ibm,drc-types", NULL); 188 domains = (int *) get_property(dn, "ibm,drc-power-domains", NULL); 189 190 if (!indexes || !names || !types || !domains) { 191 /* Slot does not have dynamically-removable children */ 192 return -EINVAL; 193 } 194 if (drc_indexes) 195 *drc_indexes = indexes; 196 if (drc_names) 197 /* &drc_names[1] contains NULL terminated slot names */ 198 *drc_names = names; 199 if (drc_types) 200 /* &drc_types[1] contains NULL terminated slot types */ 201 *drc_types = types; 202 if (drc_power_domains) 203 *drc_power_domains = domains; 204 205 return 0; 206 } 207 208 /* To get the DRC props describing the current node, first obtain it's 209 * my-drc-index property. Next obtain the DRC list from it's parent. Use 210 * the my-drc-index for correlation, and obtain the requested properties. 211 */ 212 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index, 213 char **drc_name, char **drc_type, int *drc_power_domain) 214 { 215 int *indexes, *names; 216 int *types, *domains; 217 unsigned int *my_index; 218 char *name_tmp, *type_tmp; 219 int i, rc; 220 221 my_index = (int *) get_property(dn, "ibm,my-drc-index", NULL); 222 if (!my_index) { 223 /* Node isn't DLPAR/hotplug capable */ 224 return -EINVAL; 225 } 226 227 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); 228 if (rc < 0) { 229 return -EINVAL; 230 } 231 232 name_tmp = (char *) &names[1]; 233 type_tmp = (char *) &types[1]; 234 235 /* Iterate through parent properties, looking for my-drc-index */ 236 for (i = 0; i < indexes[0]; i++) { 237 if ((unsigned int) indexes[i + 1] == *my_index) { 238 if (drc_name) 239 *drc_name = name_tmp; 240 if (drc_type) 241 *drc_type = type_tmp; 242 if (drc_index) 243 *drc_index = *my_index; 244 if (drc_power_domain) 245 *drc_power_domain = domains[i+1]; 246 return 0; 247 } 248 name_tmp += (strlen(name_tmp) + 1); 249 type_tmp += (strlen(type_tmp) + 1); 250 } 251 252 return -EINVAL; 253 } 254 255 static int is_php_type(char *drc_type) 256 { 257 unsigned long value; 258 char *endptr; 259 260 /* PCI Hotplug nodes have an integer for drc_type */ 261 value = simple_strtoul(drc_type, &endptr, 10); 262 if (endptr == drc_type) 263 return 0; 264 265 return 1; 266 } 267 268 static int is_php_dn(struct device_node *dn, int **indexes, int **names, 269 int **types, int **power_domains) 270 { 271 int *drc_types; 272 int rc; 273 274 rc = get_children_props(dn, indexes, names, &drc_types, power_domains); 275 if (rc >= 0) { 276 if (is_php_type((char *) &drc_types[1])) { 277 *types = drc_types; 278 return 1; 279 } 280 } 281 282 return 0; 283 } 284 285 /** 286 * rpaphp_add_slot -- add hotplug or dlpar slot 287 * 288 * rpaphp not only registers PCI hotplug slots(HOTPLUG), 289 * but also logical DR slots(EMBEDDED). 290 * HOTPLUG slot: An adapter can be physically added/removed. 291 * EMBEDDED slot: An adapter can be logically removed/added 292 * from/to a partition with the slot. 293 */ 294 int rpaphp_add_slot(struct device_node *dn) 295 { 296 struct slot *slot; 297 int retval = 0; 298 int i; 299 int *indexes, *names, *types, *power_domains; 300 char *name, *type; 301 302 dbg("Entry %s: dn->full_name=%s\n", __FUNCTION__, dn->full_name); 303 304 /* register PCI devices */ 305 if (dn->name != 0 && strcmp(dn->name, "pci") == 0) { 306 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) 307 goto exit; 308 309 name = (char *) &names[1]; 310 type = (char *) &types[1]; 311 for (i = 0; i < indexes[0]; i++, 312 name += (strlen(name) + 1), type += (strlen(type) + 1)) { 313 314 if (!(slot = alloc_slot_struct(dn, indexes[i + 1], name, 315 power_domains[i + 1]))) { 316 retval = -ENOMEM; 317 goto exit; 318 } 319 slot->type = simple_strtoul(type, NULL, 10); 320 321 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", 322 indexes[i + 1], name, type); 323 324 retval = rpaphp_register_pci_slot(slot); 325 } 326 } 327 exit: 328 dbg("%s - Exit: num_slots=%d rc[%d]\n", 329 __FUNCTION__, num_slots, retval); 330 return retval; 331 } 332 333 static void __exit cleanup_slots(void) 334 { 335 struct list_head *tmp, *n; 336 struct slot *slot; 337 338 /* 339 * Unregister all of our slots with the pci_hotplug subsystem, 340 * and free up all memory that we had allocated. 341 * memory will be freed in release_slot callback. 342 */ 343 344 list_for_each_safe(tmp, n, &rpaphp_slot_head) { 345 slot = list_entry(tmp, struct slot, rpaphp_slot_list); 346 list_del(&slot->rpaphp_slot_list); 347 pci_hp_deregister(slot->hotplug_slot); 348 } 349 return; 350 } 351 352 static int __init rpaphp_init(void) 353 { 354 struct device_node *dn = NULL; 355 356 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 357 init_MUTEX(&rpaphp_sem); 358 359 while ((dn = of_find_node_by_type(dn, "pci"))) 360 rpaphp_add_slot(dn); 361 362 return 0; 363 } 364 365 static void __exit rpaphp_exit(void) 366 { 367 cleanup_slots(); 368 } 369 370 static int __enable_slot(struct slot *slot) 371 { 372 int state; 373 int retval; 374 375 if (slot->state == CONFIGURED) 376 return 0; 377 378 retval = rpaphp_get_sensor_state(slot, &state); 379 if (retval) 380 return retval; 381 382 if (state == PRESENT) { 383 pcibios_add_pci_devices(slot->bus); 384 slot->state = CONFIGURED; 385 } else if (state == EMPTY) { 386 slot->state = EMPTY; 387 } else { 388 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, slot->name); 389 slot->state = NOT_VALID; 390 return -EINVAL; 391 } 392 return 0; 393 } 394 395 static int enable_slot(struct hotplug_slot *hotplug_slot) 396 { 397 int retval; 398 struct slot *slot = (struct slot *)hotplug_slot->private; 399 400 down(&rpaphp_sem); 401 retval = __enable_slot(slot); 402 up(&rpaphp_sem); 403 404 return retval; 405 } 406 407 static int __disable_slot(struct slot *slot) 408 { 409 struct pci_dev *dev, *tmp; 410 411 if (slot->state == NOT_CONFIGURED) 412 return -EINVAL; 413 414 list_for_each_entry_safe(dev, tmp, &slot->bus->devices, bus_list) { 415 eeh_remove_bus_device(dev); 416 pci_remove_bus_device(dev); 417 } 418 419 slot->state = NOT_CONFIGURED; 420 return 0; 421 } 422 423 static int disable_slot(struct hotplug_slot *hotplug_slot) 424 { 425 struct slot *slot = (struct slot *)hotplug_slot->private; 426 int retval; 427 428 down(&rpaphp_sem); 429 retval = __disable_slot (slot); 430 up(&rpaphp_sem); 431 432 return retval; 433 } 434 435 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { 436 .owner = THIS_MODULE, 437 .enable_slot = enable_slot, 438 .disable_slot = disable_slot, 439 .set_attention_status = set_attention_status, 440 .get_power_status = get_power_status, 441 .get_attention_status = get_attention_status, 442 .get_adapter_status = get_adapter_status, 443 .get_max_bus_speed = get_max_bus_speed, 444 }; 445 446 module_init(rpaphp_init); 447 module_exit(rpaphp_exit); 448 449 EXPORT_SYMBOL_GPL(rpaphp_add_slot); 450 EXPORT_SYMBOL_GPL(rpaphp_slot_head); 451 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props); 452