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