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