1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform. 4 * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> 5 * 6 * All rights reserved. 7 * 8 * Send feedback to <lxie@us.ibm.com> 9 * 10 */ 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/moduleparam.h> 14 #include <linux/pci.h> 15 #include <linux/pci_hotplug.h> 16 #include <linux/smp.h> 17 #include <linux/init.h> 18 #include <linux/vmalloc.h> 19 #include <asm/firmware.h> 20 #include <asm/eeh.h> /* for eeh_add_device() */ 21 #include <asm/rtas.h> /* rtas_call */ 22 #include <asm/pci-bridge.h> /* for pci_controller */ 23 #include "../pci.h" /* for pci_add_new_bus */ 24 /* and pci_do_scan_bus */ 25 #include "rpaphp.h" 26 27 bool rpaphp_debug; 28 LIST_HEAD(rpaphp_slot_head); 29 EXPORT_SYMBOL_GPL(rpaphp_slot_head); 30 31 #define DRIVER_VERSION "0.1" 32 #define DRIVER_AUTHOR "Linda Xie <lxie@us.ibm.com>" 33 #define DRIVER_DESC "RPA HOT Plug PCI Controller Driver" 34 35 #define MAX_LOC_CODE 128 36 37 MODULE_AUTHOR(DRIVER_AUTHOR); 38 MODULE_DESCRIPTION(DRIVER_DESC); 39 MODULE_LICENSE("GPL"); 40 41 module_param_named(debug, rpaphp_debug, bool, 0644); 42 43 /** 44 * set_attention_status - set attention LED 45 * @hotplug_slot: target &hotplug_slot 46 * @value: LED control value 47 * 48 * echo 0 > attention -- set LED OFF 49 * echo 1 > attention -- set LED ON 50 * echo 2 > attention -- set LED ID(identify, light is blinking) 51 */ 52 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value) 53 { 54 int rc; 55 struct slot *slot = to_slot(hotplug_slot); 56 57 switch (value) { 58 case 0: 59 case 1: 60 case 2: 61 break; 62 default: 63 value = 1; 64 break; 65 } 66 67 rc = rtas_set_indicator(DR_INDICATOR, slot->index, value); 68 if (!rc) 69 slot->attention_status = value; 70 71 return rc; 72 } 73 74 /** 75 * get_power_status - get power status of a slot 76 * @hotplug_slot: slot to get status 77 * @value: pointer to store status 78 */ 79 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) 80 { 81 int retval, level; 82 struct slot *slot = to_slot(hotplug_slot); 83 84 retval = rtas_get_power_level(slot->power_domain, &level); 85 if (!retval) 86 *value = level; 87 return retval; 88 } 89 90 /** 91 * get_attention_status - get attention LED status 92 * @hotplug_slot: slot to get status 93 * @value: pointer to store status 94 */ 95 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) 96 { 97 struct slot *slot = to_slot(hotplug_slot); 98 *value = slot->attention_status; 99 return 0; 100 } 101 102 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) 103 { 104 struct slot *slot = to_slot(hotplug_slot); 105 int rc, state; 106 107 rc = rpaphp_get_sensor_state(slot, &state); 108 109 *value = NOT_VALID; 110 if (rc) 111 return rc; 112 113 if (state == EMPTY) 114 *value = EMPTY; 115 else if (state == PRESENT) 116 *value = slot->state; 117 118 return 0; 119 } 120 121 static enum pci_bus_speed get_max_bus_speed(struct slot *slot) 122 { 123 enum pci_bus_speed speed; 124 switch (slot->type) { 125 case 1: 126 case 2: 127 case 3: 128 case 4: 129 case 5: 130 case 6: 131 speed = PCI_SPEED_33MHz; /* speed for case 1-6 */ 132 break; 133 case 7: 134 case 8: 135 speed = PCI_SPEED_66MHz; 136 break; 137 case 11: 138 case 14: 139 speed = PCI_SPEED_66MHz_PCIX; 140 break; 141 case 12: 142 case 15: 143 speed = PCI_SPEED_100MHz_PCIX; 144 break; 145 case 13: 146 case 16: 147 speed = PCI_SPEED_133MHz_PCIX; 148 break; 149 default: 150 speed = PCI_SPEED_UNKNOWN; 151 break; 152 } 153 154 return speed; 155 } 156 157 static int get_children_props(struct device_node *dn, const int **drc_indexes, 158 const int **drc_names, const int **drc_types, 159 const int **drc_power_domains) 160 { 161 const int *indexes, *names, *types, *domains; 162 163 indexes = of_get_property(dn, "ibm,drc-indexes", NULL); 164 names = of_get_property(dn, "ibm,drc-names", NULL); 165 types = of_get_property(dn, "ibm,drc-types", NULL); 166 domains = of_get_property(dn, "ibm,drc-power-domains", NULL); 167 168 if (!indexes || !names || !types || !domains) { 169 /* Slot does not have dynamically-removable children */ 170 return -EINVAL; 171 } 172 if (drc_indexes) 173 *drc_indexes = indexes; 174 if (drc_names) 175 /* &drc_names[1] contains NULL terminated slot names */ 176 *drc_names = names; 177 if (drc_types) 178 /* &drc_types[1] contains NULL terminated slot types */ 179 *drc_types = types; 180 if (drc_power_domains) 181 *drc_power_domains = domains; 182 183 return 0; 184 } 185 186 187 /* Verify the existence of 'drc_name' and/or 'drc_type' within the 188 * current node. First obtain it's my-drc-index property. Next, 189 * obtain the DRC info from it's parent. Use the my-drc-index for 190 * correlation, and obtain/validate the requested properties. 191 */ 192 193 static int rpaphp_check_drc_props_v1(struct device_node *dn, char *drc_name, 194 char *drc_type, unsigned int my_index) 195 { 196 char *name_tmp, *type_tmp; 197 const int *indexes, *names; 198 const int *types, *domains; 199 int i, rc; 200 201 rc = get_children_props(dn->parent, &indexes, &names, &types, &domains); 202 if (rc < 0) { 203 return -EINVAL; 204 } 205 206 name_tmp = (char *) &names[1]; 207 type_tmp = (char *) &types[1]; 208 209 /* Iterate through parent properties, looking for my-drc-index */ 210 for (i = 0; i < be32_to_cpu(indexes[0]); i++) { 211 if ((unsigned int) indexes[i + 1] == my_index) 212 break; 213 214 name_tmp += (strlen(name_tmp) + 1); 215 type_tmp += (strlen(type_tmp) + 1); 216 } 217 218 if (((drc_name == NULL) || (drc_name && !strcmp(drc_name, name_tmp))) && 219 ((drc_type == NULL) || (drc_type && !strcmp(drc_type, type_tmp)))) 220 return 0; 221 222 return -EINVAL; 223 } 224 225 static int rpaphp_check_drc_props_v2(struct device_node *dn, char *drc_name, 226 char *drc_type, unsigned int my_index) 227 { 228 struct property *info; 229 unsigned int entries; 230 struct of_drc_info drc; 231 const __be32 *value; 232 char cell_drc_name[MAX_DRC_NAME_LEN]; 233 int j; 234 235 info = of_find_property(dn->parent, "ibm,drc-info", NULL); 236 if (info == NULL) 237 return -EINVAL; 238 239 value = of_prop_next_u32(info, NULL, &entries); 240 if (!value) 241 return -EINVAL; 242 243 for (j = 0; j < entries; j++) { 244 of_read_drc_info_cell(&info, &value, &drc); 245 246 /* Should now know end of current entry */ 247 248 /* Found it */ 249 if (my_index <= drc.last_drc_index) { 250 sprintf(cell_drc_name, "%s%d", drc.drc_name_prefix, 251 my_index); 252 break; 253 } 254 } 255 256 if (((drc_name == NULL) || 257 (drc_name && !strcmp(drc_name, cell_drc_name))) && 258 ((drc_type == NULL) || 259 (drc_type && !strcmp(drc_type, drc.drc_type)))) 260 return 0; 261 262 return -EINVAL; 263 } 264 265 int rpaphp_check_drc_props(struct device_node *dn, char *drc_name, 266 char *drc_type) 267 { 268 const unsigned int *my_index; 269 270 my_index = of_get_property(dn, "ibm,my-drc-index", NULL); 271 if (!my_index) { 272 /* Node isn't DLPAR/hotplug capable */ 273 return -EINVAL; 274 } 275 276 if (firmware_has_feature(FW_FEATURE_DRC_INFO)) 277 return rpaphp_check_drc_props_v2(dn, drc_name, drc_type, 278 *my_index); 279 else 280 return rpaphp_check_drc_props_v1(dn, drc_name, drc_type, 281 *my_index); 282 } 283 EXPORT_SYMBOL_GPL(rpaphp_check_drc_props); 284 285 286 static int is_php_type(char *drc_type) 287 { 288 unsigned long value; 289 char *endptr; 290 291 /* PCI Hotplug nodes have an integer for drc_type */ 292 value = simple_strtoul(drc_type, &endptr, 10); 293 if (endptr == drc_type) 294 return 0; 295 296 return 1; 297 } 298 299 /** 300 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0 301 * @dn: target &device_node 302 * @indexes: passed to get_children_props() 303 * @names: passed to get_children_props() 304 * @types: returned from get_children_props() 305 * @power_domains: 306 * 307 * This routine will return true only if the device node is 308 * a hotpluggable slot. This routine will return false 309 * for built-in pci slots (even when the built-in slots are 310 * dlparable.) 311 */ 312 static int is_php_dn(struct device_node *dn, const int **indexes, 313 const int **names, const int **types, const int **power_domains) 314 { 315 const int *drc_types; 316 int rc; 317 318 rc = get_children_props(dn, indexes, names, &drc_types, power_domains); 319 if (rc < 0) 320 return 0; 321 322 if (!is_php_type((char *) &drc_types[1])) 323 return 0; 324 325 *types = drc_types; 326 return 1; 327 } 328 329 /** 330 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem. 331 * @dn: device node of slot 332 * 333 * This subroutine will register a hotpluggable slot with the 334 * PCI hotplug infrastructure. This routine is typically called 335 * during boot time, if the hotplug slots are present at boot time, 336 * or is called later, by the dlpar add code, if the slot is 337 * being dynamically added during runtime. 338 * 339 * If the device node points at an embedded (built-in) slot, this 340 * routine will just return without doing anything, since embedded 341 * slots cannot be hotplugged. 342 * 343 * To remove a slot, it suffices to call rpaphp_deregister_slot(). 344 */ 345 int rpaphp_add_slot(struct device_node *dn) 346 { 347 struct slot *slot; 348 int retval = 0; 349 int i; 350 const int *indexes, *names, *types, *power_domains; 351 char *name, *type; 352 353 if (!dn->name || strcmp(dn->name, "pci")) 354 return 0; 355 356 /* If this is not a hotplug slot, return without doing anything. */ 357 if (!is_php_dn(dn, &indexes, &names, &types, &power_domains)) 358 return 0; 359 360 dbg("Entry %s: dn=%pOF\n", __func__, dn); 361 362 /* register PCI devices */ 363 name = (char *) &names[1]; 364 type = (char *) &types[1]; 365 for (i = 0; i < be32_to_cpu(indexes[0]); i++) { 366 int index; 367 368 index = be32_to_cpu(indexes[i + 1]); 369 slot = alloc_slot_struct(dn, index, name, 370 be32_to_cpu(power_domains[i + 1])); 371 if (!slot) 372 return -ENOMEM; 373 374 slot->type = simple_strtoul(type, NULL, 10); 375 376 dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n", 377 index, name, type); 378 379 retval = rpaphp_enable_slot(slot); 380 if (!retval) 381 retval = rpaphp_register_slot(slot); 382 383 if (retval) 384 dealloc_slot_struct(slot); 385 386 name += strlen(name) + 1; 387 type += strlen(type) + 1; 388 } 389 dbg("%s - Exit: rc[%d]\n", __func__, retval); 390 391 /* XXX FIXME: reports a failure only if last entry in loop failed */ 392 return retval; 393 } 394 EXPORT_SYMBOL_GPL(rpaphp_add_slot); 395 396 static void __exit cleanup_slots(void) 397 { 398 struct slot *slot, *next; 399 400 /* 401 * Unregister all of our slots with the pci_hotplug subsystem, 402 * and free up all memory that we had allocated. 403 */ 404 405 list_for_each_entry_safe(slot, next, &rpaphp_slot_head, 406 rpaphp_slot_list) { 407 list_del(&slot->rpaphp_slot_list); 408 pci_hp_deregister(&slot->hotplug_slot); 409 dealloc_slot_struct(slot); 410 } 411 } 412 413 static int __init rpaphp_init(void) 414 { 415 struct device_node *dn; 416 417 info(DRIVER_DESC " version: " DRIVER_VERSION "\n"); 418 419 for_each_node_by_name(dn, "pci") 420 rpaphp_add_slot(dn); 421 422 return 0; 423 } 424 425 static void __exit rpaphp_exit(void) 426 { 427 cleanup_slots(); 428 } 429 430 static int enable_slot(struct hotplug_slot *hotplug_slot) 431 { 432 struct slot *slot = to_slot(hotplug_slot); 433 int state; 434 int retval; 435 436 if (slot->state == CONFIGURED) 437 return 0; 438 439 retval = rpaphp_get_sensor_state(slot, &state); 440 if (retval) 441 return retval; 442 443 if (state == PRESENT) { 444 pci_lock_rescan_remove(); 445 pci_hp_add_devices(slot->bus); 446 pci_unlock_rescan_remove(); 447 slot->state = CONFIGURED; 448 } else if (state == EMPTY) { 449 slot->state = EMPTY; 450 } else { 451 err("%s: slot[%s] is in invalid state\n", __func__, slot->name); 452 slot->state = NOT_VALID; 453 return -EINVAL; 454 } 455 456 slot->bus->max_bus_speed = get_max_bus_speed(slot); 457 return 0; 458 } 459 460 static int disable_slot(struct hotplug_slot *hotplug_slot) 461 { 462 struct slot *slot = to_slot(hotplug_slot); 463 if (slot->state == NOT_CONFIGURED) 464 return -EINVAL; 465 466 pci_lock_rescan_remove(); 467 pci_hp_remove_devices(slot->bus); 468 pci_unlock_rescan_remove(); 469 vm_unmap_aliases(); 470 471 slot->state = NOT_CONFIGURED; 472 return 0; 473 } 474 475 const struct hotplug_slot_ops rpaphp_hotplug_slot_ops = { 476 .enable_slot = enable_slot, 477 .disable_slot = disable_slot, 478 .set_attention_status = set_attention_status, 479 .get_power_status = get_power_status, 480 .get_attention_status = get_attention_status, 481 .get_adapter_status = get_adapter_status, 482 }; 483 484 module_init(rpaphp_init); 485 module_exit(rpaphp_exit); 486