linux/drivers/pci/hotplug/rpaphp_core.c
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   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
  40bool rpaphp_debug;
  41LIST_HEAD(rpaphp_slot_head);
  42EXPORT_SYMBOL_GPL(rpaphp_slot_head);
  43
  44#define DRIVER_VERSION  "0.1"
  45#define DRIVER_AUTHOR   "Linda Xie <lxie@us.ibm.com>"
  46#define DRIVER_DESC     "RPA HOT Plug PCI Controller Driver"
  47
  48#define MAX_LOC_CODE 128
  49
  50MODULE_AUTHOR(DRIVER_AUTHOR);
  51MODULE_DESCRIPTION(DRIVER_DESC);
  52MODULE_LICENSE("GPL");
  53
  54module_param_named(debug, rpaphp_debug, bool, 0644);
  55
  56/**
  57 * set_attention_status - set attention LED
  58 * @hotplug_slot: target &hotplug_slot
  59 * @value: LED control value
  60 *
  61 * echo 0 > attention -- set LED OFF
  62 * echo 1 > attention -- set LED ON
  63 * echo 2 > attention -- set LED ID(identify, light is blinking)
  64 */
  65static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
  66{
  67        int rc;
  68        struct slot *slot = (struct slot *)hotplug_slot->private;
  69
  70        switch (value) {
  71        case 0:
  72        case 1:
  73        case 2:
  74                break;
  75        default:
  76                value = 1;
  77                break;
  78        }
  79
  80        rc = rtas_set_indicator(DR_INDICATOR, slot->index, value);
  81        if (!rc)
  82                hotplug_slot->info->attention_status = value;
  83
  84        return rc;
  85}
  86
  87/**
  88 * get_power_status - get power status of a slot
  89 * @hotplug_slot: slot to get status
  90 * @value: pointer to store status
  91 */
  92static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
  93{
  94        int retval, level;
  95        struct slot *slot = (struct slot *)hotplug_slot->private;
  96
  97        retval = rtas_get_power_level(slot->power_domain, &level);
  98        if (!retval)
  99                *value = level;
 100        return retval;
 101}
 102
 103/**
 104 * get_attention_status - get attention LED status
 105 * @hotplug_slot: slot to get status
 106 * @value: pointer to store status
 107 */
 108static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
 109{
 110        struct slot *slot = (struct slot *)hotplug_slot->private;
 111        *value = slot->hotplug_slot->info->attention_status;
 112        return 0;
 113}
 114
 115static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
 116{
 117        struct slot *slot = (struct slot *)hotplug_slot->private;
 118        int rc, state;
 119
 120        rc = rpaphp_get_sensor_state(slot, &state);
 121
 122        *value = NOT_VALID;
 123        if (rc)
 124                return rc;
 125
 126        if (state == EMPTY)
 127                *value = EMPTY;
 128        else if (state == PRESENT)
 129                *value = slot->state;
 130
 131        return 0;
 132}
 133
 134static enum pci_bus_speed get_max_bus_speed(struct slot *slot)
 135{
 136        enum pci_bus_speed speed;
 137        switch (slot->type) {
 138        case 1:
 139        case 2:
 140        case 3:
 141        case 4:
 142        case 5:
 143        case 6:
 144                speed = PCI_SPEED_33MHz;        /* speed for case 1-6 */
 145                break;
 146        case 7:
 147        case 8:
 148                speed = PCI_SPEED_66MHz;
 149                break;
 150        case 11:
 151        case 14:
 152                speed = PCI_SPEED_66MHz_PCIX;
 153                break;
 154        case 12:
 155        case 15:
 156                speed = PCI_SPEED_100MHz_PCIX;
 157                break;
 158        case 13:
 159        case 16:
 160                speed = PCI_SPEED_133MHz_PCIX;
 161                break;
 162        default:
 163                speed = PCI_SPEED_UNKNOWN;
 164                break;
 165        }
 166
 167        return speed;
 168}
 169
 170static 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 */
 203int 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 < be32_to_cpu(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 = be32_to_cpu(*my_index);
 235                        if (drc_power_domain)
 236                                *drc_power_domain = be32_to_cpu(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}
 245EXPORT_SYMBOL_GPL(rpaphp_get_drc_props);
 246
 247static int is_php_type(char *drc_type)
 248{
 249        unsigned long value;
 250        char *endptr;
 251
 252        /* PCI Hotplug nodes have an integer for drc_type */
 253        value = simple_strtoul(drc_type, &endptr, 10);
 254        if (endptr == drc_type)
 255                return 0;
 256
 257        return 1;
 258}
 259
 260/**
 261 * is_php_dn() - return 1 if this is a hotpluggable pci slot, else 0
 262 * @dn: target &device_node
 263 * @indexes: passed to get_children_props()
 264 * @names: passed to get_children_props()
 265 * @types: returned from get_children_props()
 266 * @power_domains:
 267 *
 268 * This routine will return true only if the device node is
 269 * a hotpluggable slot. This routine will return false
 270 * for built-in pci slots (even when the built-in slots are
 271 * dlparable.)
 272 */
 273static int is_php_dn(struct device_node *dn, const int **indexes,
 274                const int **names, const int **types, const int **power_domains)
 275{
 276        const int *drc_types;
 277        int rc;
 278
 279        rc = get_children_props(dn, indexes, names, &drc_types, power_domains);
 280        if (rc < 0)
 281                return 0;
 282
 283        if (!is_php_type((char *) &drc_types[1]))
 284                return 0;
 285
 286        *types = drc_types;
 287        return 1;
 288}
 289
 290/**
 291 * rpaphp_add_slot -- declare a hotplug slot to the hotplug subsystem.
 292 * @dn: device node of slot
 293 *
 294 * This subroutine will register a hotpluggable slot with the
 295 * PCI hotplug infrastructure. This routine is typically called
 296 * during boot time, if the hotplug slots are present at boot time,
 297 * or is called later, by the dlpar add code, if the slot is
 298 * being dynamically added during runtime.
 299 *
 300 * If the device node points at an embedded (built-in) slot, this
 301 * routine will just return without doing anything, since embedded
 302 * slots cannot be hotplugged.
 303 *
 304 * To remove a slot, it suffices to call rpaphp_deregister_slot().
 305 */
 306int rpaphp_add_slot(struct device_node *dn)
 307{
 308        struct slot *slot;
 309        int retval = 0;
 310        int i;
 311        const int *indexes, *names, *types, *power_domains;
 312        char *name, *type;
 313
 314        if (!dn->name || strcmp(dn->name, "pci"))
 315                return 0;
 316
 317        /* If this is not a hotplug slot, return without doing anything. */
 318        if (!is_php_dn(dn, &indexes, &names, &types, &power_domains))
 319                return 0;
 320
 321        dbg("Entry %s: dn->full_name=%s\n", __func__, dn->full_name);
 322
 323        /* register PCI devices */
 324        name = (char *) &names[1];
 325        type = (char *) &types[1];
 326        for (i = 0; i < be32_to_cpu(indexes[0]); i++) {
 327                int index;
 328
 329                index = be32_to_cpu(indexes[i + 1]);
 330                slot = alloc_slot_struct(dn, index, name,
 331                                         be32_to_cpu(power_domains[i + 1]));
 332                if (!slot)
 333                        return -ENOMEM;
 334
 335                slot->type = simple_strtoul(type, NULL, 10);
 336
 337                dbg("Found drc-index:0x%x drc-name:%s drc-type:%s\n",
 338                                index, name, type);
 339
 340                retval = rpaphp_enable_slot(slot);
 341                if (!retval)
 342                        retval = rpaphp_register_slot(slot);
 343
 344                if (retval)
 345                        dealloc_slot_struct(slot);
 346
 347                name += strlen(name) + 1;
 348                type += strlen(type) + 1;
 349        }
 350        dbg("%s - Exit: rc[%d]\n", __func__, retval);
 351
 352        /* XXX FIXME: reports a failure only if last entry in loop failed */
 353        return retval;
 354}
 355EXPORT_SYMBOL_GPL(rpaphp_add_slot);
 356
 357static void __exit cleanup_slots(void)
 358{
 359        struct slot *slot, *next;
 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_entry_safe(slot, next, &rpaphp_slot_head,
 368                                 rpaphp_slot_list) {
 369                list_del(&slot->rpaphp_slot_list);
 370                pci_hp_deregister(slot->hotplug_slot);
 371        }
 372        return;
 373}
 374
 375static int __init rpaphp_init(void)
 376{
 377        struct device_node *dn;
 378
 379        info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 380
 381        for_each_node_by_name(dn, "pci")
 382                rpaphp_add_slot(dn);
 383
 384        return 0;
 385}
 386
 387static void __exit rpaphp_exit(void)
 388{
 389        cleanup_slots();
 390}
 391
 392static int enable_slot(struct hotplug_slot *hotplug_slot)
 393{
 394        struct slot *slot = (struct slot *)hotplug_slot->private;
 395        int state;
 396        int retval;
 397
 398        if (slot->state == CONFIGURED)
 399                return 0;
 400
 401        retval = rpaphp_get_sensor_state(slot, &state);
 402        if (retval)
 403                return retval;
 404
 405        if (state == PRESENT) {
 406                pci_lock_rescan_remove();
 407                pci_hp_add_devices(slot->bus);
 408                pci_unlock_rescan_remove();
 409                slot->state = CONFIGURED;
 410        } else if (state == EMPTY) {
 411                slot->state = EMPTY;
 412        } else {
 413                err("%s: slot[%s] is in invalid state\n", __func__, slot->name);
 414                slot->state = NOT_VALID;
 415                return -EINVAL;
 416        }
 417
 418        slot->bus->max_bus_speed = get_max_bus_speed(slot);
 419        return 0;
 420}
 421
 422static int disable_slot(struct hotplug_slot *hotplug_slot)
 423{
 424        struct slot *slot = (struct slot *)hotplug_slot->private;
 425        if (slot->state == NOT_CONFIGURED)
 426                return -EINVAL;
 427
 428        pci_lock_rescan_remove();
 429        pci_hp_remove_devices(slot->bus);
 430        pci_unlock_rescan_remove();
 431        vm_unmap_aliases();
 432
 433        slot->state = NOT_CONFIGURED;
 434        return 0;
 435}
 436
 437struct hotplug_slot_ops rpaphp_hotplug_slot_ops = {
 438        .enable_slot = enable_slot,
 439        .disable_slot = disable_slot,
 440        .set_attention_status = set_attention_status,
 441        .get_power_status = get_power_status,
 442        .get_attention_status = get_attention_status,
 443        .get_adapter_status = get_adapter_status,
 444};
 445
 446module_init(rpaphp_init);
 447module_exit(rpaphp_exit);
 448