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/smp.h> 31 #include <linux/init.h> 32 #include <linux/vmalloc.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 bool 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 enum pci_bus_speed get_max_bus_speed(struct slot *slot) 134 { 135 enum pci_bus_speed speed; 136 switch (slot->type) { 137 case 1: 138 case 2: 139 case 3: 140 case 4: 141 case 5: 142 case 6: 143 speed = PCI_SPEED_33MHz; /* speed for case 1-6 */ 144 break; 145 case 7: 146 case 8: 147 speed = PCI_SPEED_66MHz; 148 break; 149 case 11: 150 case 14: 151 speed = PCI_SPEED_66MHz_PCIX; 152 break; 153 case 12: 154 case 15: 155 speed = PCI_SPEED_100MHz_PCIX; 156 break; 157 case 13: 158 case 16: 159 speed = PCI_SPEED_133MHz_PCIX; 160 break; 161 default: 162 speed = PCI_SPEED_UNKNOWN; 163 break; 164 } 165 166 return speed; 167 } 168 169 static int get_children_props(struct device_node *dn, const int **drc_indexes, 170 const int **drc_names, const int **drc_types, 171 const int **drc_power_domains) 172 { 173 const int *indexes, *names, *types, *domains; 174 175 indexes = of_get_property(dn, "ibm,drc-indexes", NULL); 176 names = of_get_property(dn, "ibm,drc-names", NULL); 177 types = of_get_property(dn, "ibm,drc-types", NULL); 178 domains = of_get_property(dn, "ibm,drc-power-domains", NULL); 179 180 if (!indexes || !names || !types || !domains) { 181 /* Slot does not have dynamically-removable children */ 182 return -EINVAL; 183 } 184 if (drc_indexes) 185 *drc_indexes = indexes; 186 if (drc_names) 187 /* &drc_names[1] contains NULL terminated slot names */ 188 *drc_names = names; 189 if (drc_types) 190 /* &drc_types[1] contains NULL terminated slot types */ 191 *drc_types = types; 192 if (drc_power_domains) 193 *drc_power_domains = domains; 194 195 return 0; 196 } 197 198 /* To get the DRC props describing the current node, first obtain it's 199 * my-drc-index property. Next obtain the DRC list from it's parent. Use 200 * the my-drc-index for correlation, and obtain the requested properties. 201 */ 202 int rpaphp_get_drc_props(struct device_node *dn, int *drc_index, 203 char **drc_name, char **drc_type, int *drc_power_domain) 204 { 205 const int *indexes, *names; 206 const int *types, *domains; 207 const unsigned int *my_index; 208 char *name_tmp, *type_tmp; 209 int i, rc; 210 211 my_index = of_get_property(dn, "ibm,my-drc-index", NULL); 212 if (!my_index) { 213 /* Node isn't DLPAR/hotplug capable */ 214 return -EINVAL; 215 } 216 217 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); 218 if (rc < 0) { 219 return -EINVAL; 220 } 221 222 name_tmp = (char *) &names[1]; 223 type_tmp = (char *) &types[1]; 224 225 /* Iterate through parent properties, looking for my-drc-index */ 226 for (i = 0; i < indexes[0]; i++) { 227 if ((unsigned int) indexes[i + 1] == *my_index) { 228 if (drc_name) 229 *drc_name = name_tmp; 230 if (drc_type) 231 *drc_type = type_tmp; 232 if (drc_index) 233 *drc_index = *my_index; 234 if (drc_power_domain) 235 *drc_power_domain = domains[i+1]; 236 return 0; 237 } 238 name_tmp += (strlen(name_tmp) + 1); 239 type_tmp += (strlen(type_tmp) + 1); 240 } 241 242 return -EINVAL; 243 } 244 245 static int is_php_type(char *drc_type) 246 { 247 unsigned long value; 248 char *endptr; 249 250 /* PCI Hotplug nodes have an integer for drc_type */ 251 value = simple_strtoul(drc_type, &endptr, 10); 252 if (endptr == drc_type) 253 return 0; 254 255 return 1; 256 } 257 258 /** 259 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0 260 * @dn: target &device_node 261 * @indexes: passed to get_children_props() 262 * @names: passed to get_children_props() 263 * @types: returned from get_children_props() 264 * @power_domains: 265 * 266 * This routine will return true only if the device node is 267 * a hotpluggable slot. This routine will return false 268 * for built-in pci slots (even when the built-in slots are 269 * dlparable.) 270 */ 271 static int is_php_dn(struct device_node *dn, const int **indexes, 272 const int **names, const int **types, const int **power_domains) 273 { 274 const int *drc_types; 275 int rc; 276 277 rc = get_children_props(dn, indexes, names, &drc_types, power_domains); 278 if (rc < 0) 279 return 0; 280 281 if (!is_php_type((char *) &drc_types[1])) 282 return 0; 283 284 *types = drc_types; 285 return 1; 286 } 287 288 /** 289 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem. 290 * @dn: device node of slot 291 * 292 * This subroutine will register a hotpluggable slot with the 293 * PCI hotplug infrastructure. This routine is typically called 294 * during boot time, if the hotplug slots are present at boot time, 295 * or is called later, by the dlpar add code, if the slot is 296 * being dynamically added during runtime. 297 * 298 * If the device node points at an embedded (built-in) slot, this 299 * routine will just return without doing anything, since embedded 300 * slots cannot be hotplugged. 301 * 302 * To remove a slot, it suffices to call rpaphp_deregister_slot(). 303 */ 304 int rpaphp_add_slot(struct device_node *dn) 305 { 306 struct slot *slot; 307 int retval = 0; 308 int i; 309 const int *indexes, *names, *types, *power_domains; 310 char *name, *type; 311 312 if (!dn->name || strcmp(dn->name, "pci")) 313 return 0; 314 315 /* If this is not a hotplug slot, return without doing anything. */ 316 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) 317 return 0; 318 319 dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name); 320 321 /* register PCI devices */ 322 name = (char *) &names[1]; 323 type = (char *) &types[1]; 324 for (i = 0; i < indexes[0]; i++) { 325 326 slot = alloc_slot_struct(dn, indexes[i + 1], name, power_domains[i + 1]); 327 if (!slot) 328 return -ENOMEM; 329 330 slot->type = simple_strtoul(type, NULL, 10); 331 332 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", 333 indexes[i + 1], name, type); 334 335 retval = rpaphp_enable_slot(slot); 336 if (!retval) 337 retval = rpaphp_register_slot(slot); 338 339 if (retval) 340 dealloc_slot_struct(slot); 341 342 name += strlen(name) + 1; 343 type += strlen(type) + 1; 344 } 345 dbg("%s - Exit: rc[%d]\n", __func__, retval); 346 347 /* XXX FIXME: reports a failure only if last entry in loop failed */ 348 return retval; 349 } 350 351 static void __exit cleanup_slots(void) 352 { 353 struct list_head *tmp, *n; 354 struct slot *slot; 355 356 /* 357 * Unregister all of our slots with the pci_hotplug subsystem, 358 * and free up all memory that we had allocated. 359 * memory will be freed in release_slot callback. 360 */ 361 362 list_for_each_safe(tmp, n, &rpaphp_slot_head) { 363 slot = list_entry(tmp, struct slot, rpaphp_slot_list); 364 list_del(&slot->rpaphp_slot_list); 365 pci_hp_deregister(slot->hotplug_slot); 366 } 367 return; 368 } 369 370 static int __init rpaphp_init(void) 371 { 372 struct device_node *dn = NULL; 373 374 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 375 376 while ((dn = of_find_node_by_name(dn, "pci"))) 377 rpaphp_add_slot(dn); 378 379 return 0; 380 } 381 382 static void __exit rpaphp_exit(void) 383 { 384 cleanup_slots(); 385 } 386 387 static int enable_slot(struct hotplug_slot *hotplug_slot) 388 { 389 struct slot *slot = (struct slot *)hotplug_slot->private; 390 int state; 391 int retval; 392 393 if (slot->state == CONFIGURED) 394 return 0; 395 396 retval = rpaphp_get_sensor_state(slot, &state); 397 if (retval) 398 return retval; 399 400 if (state == PRESENT) { 401 pcibios_add_pci_devices(slot->bus); 402 slot->state = CONFIGURED; 403 } else if (state == EMPTY) { 404 slot->state = EMPTY; 405 } else { 406 err("%s: slot[%s] is in invalid state\n", __func__, slot->name); 407 slot->state = NOT_VALID; 408 return -EINVAL; 409 } 410 411 slot->bus->max_bus_speed = get_max_bus_speed(slot); 412 return 0; 413 } 414 415 static int disable_slot(struct hotplug_slot *hotplug_slot) 416 { 417 struct slot *slot = (struct slot *)hotplug_slot->private; 418 if (slot->state == NOT_CONFIGURED) 419 return -EINVAL; 420 421 pcibios_remove_pci_devices(slot->bus); 422 vm_unmap_aliases(); 423 424 slot->state = NOT_CONFIGURED; 425 return 0; 426 } 427 428 struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { 429 .enable_slot = enable_slot, 430 .disable_slot = disable_slot, 431 .set_attention_status = set_attention_status, 432 .get_power_status = get_power_status, 433 .get_attention_status = get_attention_status, 434 .get_adapter_status = get_adapter_status, 435 }; 436 437 module_init(rpaphp_init); 438 module_exit(rpaphp_exit); 439 440 EXPORT_SYMBOL_GPL(rpaphp_add_slot); 441 EXPORT_SYMBOL_GPL(rpaphp_slot_head); 442 EXPORT_SYMBOL_GPL(rpaphp_get_drc_props); 443