net/dsa/dsa.c

   1 /*
   2  * net/dsa/dsa.c - Hardware switch handling
   3  * Copyright (c) 2008-2009 Marvell Semiconductor
   4  * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/ctype.h>
  13 #include <linux/device.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/list.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <net/dsa.h>
  20 #include <linux/of.h>
  21 #include <linux/of_mdio.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/of_net.h>
  24 #include <linux/of_gpio.h>
  25 #include <linux/sysfs.h>
  26 #include <linux/phy_fixed.h>
  27 #include <linux/gpio/consumer.h>
  28 #include "dsa_priv.h"
  29
  30 char dsa_driver_version[] = "0.1";
  31
  32 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
  33                                             struct net_device *dev)
  34 {
  35         /* Just return the original SKB */
  36         return skb;
  37 }
  38
  39 static const struct dsa_device_ops none_ops = {
  40         .xmit   = dsa_slave_notag_xmit,
  41         .rcv    = NULL,
  42 };
  43
  44 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
  45 #ifdef CONFIG_NET_DSA_TAG_DSA
  46         [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
  47 #endif
  48 #ifdef CONFIG_NET_DSA_TAG_EDSA
  49         [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
  50 #endif
  51 #ifdef CONFIG_NET_DSA_TAG_TRAILER
  52         [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
  53 #endif
  54 #ifdef CONFIG_NET_DSA_TAG_BRCM
  55         [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
  56 #endif
  57         [DSA_TAG_PROTO_NONE] = &none_ops,
  58 };
  59
  60 /* switch driver registration ***********************************************/
  61 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  62 static LIST_HEAD(dsa_switch_drivers);
  63
  64 void register_switch_driver(struct dsa_switch_ops *ops)
  65 {
  66         mutex_lock(&dsa_switch_drivers_mutex);
  67         list_add_tail(&ops->list, &dsa_switch_drivers);
  68         mutex_unlock(&dsa_switch_drivers_mutex);
  69 }
  70 EXPORT_SYMBOL_GPL(register_switch_driver);
  71
  72 void unregister_switch_driver(struct dsa_switch_ops *ops)
  73 {
  74         mutex_lock(&dsa_switch_drivers_mutex);
  75         list_del_init(&ops->list);
  76         mutex_unlock(&dsa_switch_drivers_mutex);
  77 }
  78 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  79
  80 static struct dsa_switch_ops *
  81 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
  82                  const char **_name, void **priv)
  83 {
  84         struct dsa_switch_ops *ret;
  85         struct list_head *list;
  86         const char *name;
  87
  88         ret = NULL;
  89         name = NULL;
  90
  91         mutex_lock(&dsa_switch_drivers_mutex);
  92         list_for_each(list, &dsa_switch_drivers) {
  93                 struct dsa_switch_ops *ops;
  94
  95                 ops = list_entry(list, struct dsa_switch_ops, list);
  96
  97                 name = ops->probe(parent, host_dev, sw_addr, priv);
  98                 if (name != NULL) {
  99                         ret = ops;
 100                         break;
 101                 }
 102         }
 103         mutex_unlock(&dsa_switch_drivers_mutex);
 104
 105         *_name = name;
 106
 107         return ret;
 108 }
 109
 110 /* hwmon support ************************************************************/
 111
 112 #ifdef CONFIG_NET_DSA_HWMON
 113
 114 static ssize_t temp1_input_show(struct device *dev,
 115                                 struct device_attribute *attr, char *buf)
 116 {
 117         struct dsa_switch *ds = dev_get_drvdata(dev);
 118         int temp, ret;
 119
 120         ret = ds->ops->get_temp(ds, &temp);
 121         if (ret < 0)
 122                 return ret;
 123
 124         return sprintf(buf, "%d\n", temp * 1000);
 125 }
 126 static DEVICE_ATTR_RO(temp1_input);
 127
 128 static ssize_t temp1_max_show(struct device *dev,
 129                               struct device_attribute *attr, char *buf)
 130 {
 131         struct dsa_switch *ds = dev_get_drvdata(dev);
 132         int temp, ret;
 133
 134         ret = ds->ops->get_temp_limit(ds, &temp);
 135         if (ret < 0)
 136                 return ret;
 137
 138         return sprintf(buf, "%d\n", temp * 1000);
 139 }
 140
 141 static ssize_t temp1_max_store(struct device *dev,
 142                                struct device_attribute *attr, const char *buf,
 143                                size_t count)
 144 {
 145         struct dsa_switch *ds = dev_get_drvdata(dev);
 146         int temp, ret;
 147
 148         ret = kstrtoint(buf, 0, &temp);
 149         if (ret < 0)
 150                 return ret;
 151
 152         ret = ds->ops->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 153         if (ret < 0)
 154                 return ret;
 155
 156         return count;
 157 }
 158 static DEVICE_ATTR_RW(temp1_max);
 159
 160 static ssize_t temp1_max_alarm_show(struct device *dev,
 161                                     struct device_attribute *attr, char *buf)
 162 {
 163         struct dsa_switch *ds = dev_get_drvdata(dev);
 164         bool alarm;
 165         int ret;
 166
 167         ret = ds->ops->get_temp_alarm(ds, &alarm);
 168         if (ret < 0)
 169                 return ret;
 170
 171         return sprintf(buf, "%d\n", alarm);
 172 }
 173 static DEVICE_ATTR_RO(temp1_max_alarm);
 174
 175 static struct attribute *dsa_hwmon_attrs[] = {
 176         &dev_attr_temp1_input.attr,     /* 0 */
 177         &dev_attr_temp1_max.attr,       /* 1 */
 178         &dev_attr_temp1_max_alarm.attr, /* 2 */
 179         NULL
 180 };
 181
 182 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 183                                        struct attribute *attr, int index)
 184 {
 185         struct device *dev = container_of(kobj, struct device, kobj);
 186         struct dsa_switch *ds = dev_get_drvdata(dev);
 187         struct dsa_switch_ops *ops = ds->ops;
 188         umode_t mode = attr->mode;
 189
 190         if (index == 1) {
 191                 if (!ops->get_temp_limit)
 192                         mode = 0;
 193                 else if (!ops->set_temp_limit)
 194                         mode &= ~S_IWUSR;
 195         } else if (index == 2 && !ops->get_temp_alarm) {
 196                 mode = 0;
 197         }
 198         return mode;
 199 }
 200
 201 static const struct attribute_group dsa_hwmon_group = {
 202         .attrs = dsa_hwmon_attrs,
 203         .is_visible = dsa_hwmon_attrs_visible,
 204 };
 205 __ATTRIBUTE_GROUPS(dsa_hwmon);
 206
 207 #endif /* CONFIG_NET_DSA_HWMON */
 208
 209 /* basic switch operations **************************************************/
 210 int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
 211                       struct device_node *port_dn, int port)
 212 {
 213         struct phy_device *phydev;
 214         int ret, mode;
 215
 216         if (of_phy_is_fixed_link(port_dn)) {
 217                 ret = of_phy_register_fixed_link(port_dn);
 218                 if (ret) {
 219                         dev_err(dev, "failed to register fixed PHY\n");
 220                         return ret;
 221                 }
 222                 phydev = of_phy_find_device(port_dn);
 223
 224                 mode = of_get_phy_mode(port_dn);
 225                 if (mode < 0)
 226                         mode = PHY_INTERFACE_MODE_NA;
 227                 phydev->interface = mode;
 228
 229                 genphy_config_init(phydev);
 230                 genphy_read_status(phydev);
 231                 if (ds->ops->adjust_link)
 232                         ds->ops->adjust_link(ds, port, phydev);
 233         }
 234
 235         return 0;
 236 }
 237
 238 static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
 239 {
 240         struct device_node *port_dn;
 241         int ret, port;
 242
 243         for (port = 0; port < DSA_MAX_PORTS; port++) {
 244                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 245                         continue;
 246
 247                 port_dn = ds->ports[port].dn;
 248                 ret = dsa_cpu_dsa_setup(ds, dev, port_dn, port);
 249                 if (ret)
 250                         return ret;
 251         }
 252         return 0;
 253 }
 254
 255 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
 256 {
 257         const struct dsa_device_ops *ops;
 258
 259         if (tag_protocol >= DSA_TAG_LAST)
 260                 return ERR_PTR(-EINVAL);
 261         ops = dsa_device_ops[tag_protocol];
 262
 263         if (!ops)
 264                 return ERR_PTR(-ENOPROTOOPT);
 265
 266         return ops;
 267 }
 268
 269 int dsa_cpu_port_ethtool_setup(struct dsa_switch *ds)
 270 {
 271         struct net_device *master;
 272         struct ethtool_ops *cpu_ops;
 273
 274         master = ds->dst->master_netdev;
 275         if (ds->master_netdev)
 276                 master = ds->master_netdev;
 277
 278         cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
 279         if (!cpu_ops)
 280                 return -ENOMEM;
 281
 282         memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops,
 283                sizeof(struct ethtool_ops));
 284         ds->dst->master_orig_ethtool_ops = master->ethtool_ops;
 285         memcpy(cpu_ops, &ds->dst->master_ethtool_ops,
 286                sizeof(struct ethtool_ops));
 287         dsa_cpu_port_ethtool_init(cpu_ops);
 288         master->ethtool_ops = cpu_ops;
 289
 290         return 0;
 291 }
 292
 293 void dsa_cpu_port_ethtool_restore(struct dsa_switch *ds)
 294 {
 295         struct net_device *master;
 296
 297         master = ds->dst->master_netdev;
 298         if (ds->master_netdev)
 299                 master = ds->master_netdev;
 300
 301         master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
 302 }
 303
 304 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 305 {
 306         struct dsa_switch_ops *ops = ds->ops;
 307         struct dsa_switch_tree *dst = ds->dst;
 308         struct dsa_chip_data *cd = ds->cd;
 309         bool valid_name_found = false;
 310         int index = ds->index;
 311         int i, ret;
 312
 313         /*
 314          * Validate supplied switch configuration.
 315          */
 316         for (i = 0; i < DSA_MAX_PORTS; i++) {
 317                 char *name;
 318
 319                 name = cd->port_names[i];
 320                 if (name == NULL)
 321                         continue;
 322
 323                 if (!strcmp(name, "cpu")) {
 324                         if (dst->cpu_switch != -1) {
 325                                 netdev_err(dst->master_netdev,
 326                                            "multiple cpu ports?!\n");
 327                                 ret = -EINVAL;
 328                                 goto out;
 329                         }
 330                         dst->cpu_switch = index;
 331                         dst->cpu_port = i;
 332                         ds->cpu_port_mask |= 1 << i;
 333                 } else if (!strcmp(name, "dsa")) {
 334                         ds->dsa_port_mask |= 1 << i;
 335                 } else {
 336                         ds->enabled_port_mask |= 1 << i;
 337                 }
 338                 valid_name_found = true;
 339         }
 340
 341         if (!valid_name_found && i == DSA_MAX_PORTS) {
 342                 ret = -EINVAL;
 343                 goto out;
 344         }
 345
 346         /* Make the built-in MII bus mask match the number of ports,
 347          * switch drivers can override this later
 348          */
 349         ds->phys_mii_mask = ds->enabled_port_mask;
 350
 351         /*
 352          * If the CPU connects to this switch, set the switch tree
 353          * tagging protocol to the preferred tagging format of this
 354          * switch.
 355          */
 356         if (dst->cpu_switch == index) {
 357                 enum dsa_tag_protocol tag_protocol;
 358
 359                 tag_protocol = ops->get_tag_protocol(ds);
 360                 dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
 361                 if (IS_ERR(dst->tag_ops)) {
 362                         ret = PTR_ERR(dst->tag_ops);
 363                         goto out;
 364                 }
 365
 366                 dst->rcv = dst->tag_ops->rcv;
 367         }
 368
 369         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 370
 371         /*
 372          * Do basic register setup.
 373          */
 374         ret = ops->setup(ds);
 375         if (ret < 0)
 376                 goto out;
 377
 378         ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
 379         if (ret < 0)
 380                 goto out;
 381
 382         if (!ds->slave_mii_bus && ops->phy_read) {
 383                 ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 384                 if (!ds->slave_mii_bus) {
 385                         ret = -ENOMEM;
 386                         goto out;
 387                 }
 388                 dsa_slave_mii_bus_init(ds);
 389
 390                 ret = mdiobus_register(ds->slave_mii_bus);
 391                 if (ret < 0)
 392                         goto out;
 393         }
 394
 395         /*
 396          * Create network devices for physical switch ports.
 397          */
 398         for (i = 0; i < DSA_MAX_PORTS; i++) {
 399                 ds->ports[i].dn = cd->port_dn[i];
 400
 401                 if (!(ds->enabled_port_mask & (1 << i)))
 402                         continue;
 403
 404                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 405                 if (ret < 0) {
 406                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 407                                    index, i, cd->port_names[i], ret);
 408                         ret = 0;
 409                 }
 410         }
 411
 412         /* Perform configuration of the CPU and DSA ports */
 413         ret = dsa_cpu_dsa_setups(ds, parent);
 414         if (ret < 0) {
 415                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 416                            index);
 417                 ret = 0;
 418         }
 419
 420         ret = dsa_cpu_port_ethtool_setup(ds);
 421         if (ret)
 422                 return ret;
 423
 424 #ifdef CONFIG_NET_DSA_HWMON
 425         /* If the switch provides a temperature sensor,
 426          * register with hardware monitoring subsystem.
 427          * Treat registration error as non-fatal and ignore it.
 428          */
 429         if (ops->get_temp) {
 430                 const char *netname = netdev_name(dst->master_netdev);
 431                 char hname[IFNAMSIZ + 1];
 432                 int i, j;
 433
 434                 /* Create valid hwmon 'name' attribute */
 435                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 436                         if (isalnum(netname[i]))
 437                                 hname[j++] = netname[i];
 438                 }
 439                 hname[j] = '\0';
 440                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 441                           hname, index);
 442                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 443                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 444                 if (IS_ERR(ds->hwmon_dev))
 445                         ds->hwmon_dev = NULL;
 446         }
 447 #endif /* CONFIG_NET_DSA_HWMON */
 448
 449         return ret;
 450
 451 out:
 452         return ret;
 453 }
 454
 455 static struct dsa_switch *
 456 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 457                  struct device *parent, struct device *host_dev)
 458 {
 459         struct dsa_chip_data *cd = dst->pd->chip + index;
 460         struct dsa_switch_ops *ops;
 461         struct dsa_switch *ds;
 462         int ret;
 463         const char *name;
 464         void *priv;
 465
 466         /*
 467          * Probe for switch model.
 468          */
 469         ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 470         if (!ops) {
 471                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 472                            index);
 473                 return ERR_PTR(-EINVAL);
 474         }
 475         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 476                     index, name);
 477
 478
 479         /*
 480          * Allocate and initialise switch state.
 481          */
 482         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 483         if (ds == NULL)
 484                 return ERR_PTR(-ENOMEM);
 485
 486         ds->dst = dst;
 487         ds->index = index;
 488         ds->cd = cd;
 489         ds->ops = ops;
 490         ds->priv = priv;
 491         ds->dev = parent;
 492
 493         ret = dsa_switch_setup_one(ds, parent);
 494         if (ret)
 495                 return ERR_PTR(ret);
 496
 497         return ds;
 498 }
 499
 500 void dsa_cpu_dsa_destroy(struct device_node *port_dn)
 501 {
 502         struct phy_device *phydev;
 503
 504         if (of_phy_is_fixed_link(port_dn)) {
 505                 phydev = of_phy_find_device(port_dn);
 506                 if (phydev) {
 507                         phy_device_free(phydev);
 508                         fixed_phy_unregister(phydev);
 509                 }
 510         }
 511 }
 512
 513 static void dsa_switch_destroy(struct dsa_switch *ds)
 514 {
 515         int port;
 516
 517 #ifdef CONFIG_NET_DSA_HWMON
 518         if (ds->hwmon_dev)
 519                 hwmon_device_unregister(ds->hwmon_dev);
 520 #endif
 521
 522         /* Destroy network devices for physical switch ports. */
 523         for (port = 0; port < DSA_MAX_PORTS; port++) {
 524                 if (!(ds->enabled_port_mask & (1 << port)))
 525                         continue;
 526
 527                 if (!ds->ports[port].netdev)
 528                         continue;
 529
 530                 dsa_slave_destroy(ds->ports[port].netdev);
 531         }
 532
 533         /* Disable configuration of the CPU and DSA ports */
 534         for (port = 0; port < DSA_MAX_PORTS; port++) {
 535                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 536                         continue;
 537                 dsa_cpu_dsa_destroy(ds->ports[port].dn);
 538
 539                 /* Clearing a bit which is not set does no harm */
 540                 ds->cpu_port_mask |= ~(1 << port);
 541                 ds->dsa_port_mask |= ~(1 << port);
 542         }
 543
 544         if (ds->slave_mii_bus && ds->ops->phy_read)
 545                 mdiobus_unregister(ds->slave_mii_bus);
 546 }
 547
 548 #ifdef CONFIG_PM_SLEEP
 549 int dsa_switch_suspend(struct dsa_switch *ds)
 550 {
 551         int i, ret = 0;
 552
 553         /* Suspend slave network devices */
 554         for (i = 0; i < DSA_MAX_PORTS; i++) {
 555                 if (!dsa_is_port_initialized(ds, i))
 556                         continue;
 557
 558                 ret = dsa_slave_suspend(ds->ports[i].netdev);
 559                 if (ret)
 560                         return ret;
 561         }
 562
 563         if (ds->ops->suspend)
 564                 ret = ds->ops->suspend(ds);
 565
 566         return ret;
 567 }
 568 EXPORT_SYMBOL_GPL(dsa_switch_suspend);
 569
 570 int dsa_switch_resume(struct dsa_switch *ds)
 571 {
 572         int i, ret = 0;
 573
 574         if (ds->ops->resume)
 575                 ret = ds->ops->resume(ds);
 576
 577         if (ret)
 578                 return ret;
 579
 580         /* Resume slave network devices */
 581         for (i = 0; i < DSA_MAX_PORTS; i++) {
 582                 if (!dsa_is_port_initialized(ds, i))
 583                         continue;
 584
 585                 ret = dsa_slave_resume(ds->ports[i].netdev);
 586                 if (ret)
 587                         return ret;
 588         }
 589
 590         return 0;
 591 }
 592 EXPORT_SYMBOL_GPL(dsa_switch_resume);
 593 #endif
 594
 595 /* platform driver init and cleanup *****************************************/
 596 static int dev_is_class(struct device *dev, void *class)
 597 {
 598         if (dev->class != NULL && !strcmp(dev->class->name, class))
 599                 return 1;
 600
 601         return 0;
 602 }
 603
 604 static struct device *dev_find_class(struct device *parent, char *class)
 605 {
 606         if (dev_is_class(parent, class)) {
 607                 get_device(parent);
 608                 return parent;
 609         }
 610
 611         return device_find_child(parent, class, dev_is_class);
 612 }
 613
 614 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 615 {
 616         struct device *d;
 617
 618         d = dev_find_class(dev, "mdio_bus");
 619         if (d != NULL) {
 620                 struct mii_bus *bus;
 621
 622                 bus = to_mii_bus(d);
 623                 put_device(d);
 624
 625                 return bus;
 626         }
 627
 628         return NULL;
 629 }
 630 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 631
 632 static struct net_device *dev_to_net_device(struct device *dev)
 633 {
 634         struct device *d;
 635
 636         d = dev_find_class(dev, "net");
 637         if (d != NULL) {
 638                 struct net_device *nd;
 639
 640                 nd = to_net_dev(d);
 641                 dev_hold(nd);
 642                 put_device(d);
 643
 644                 return nd;
 645         }
 646
 647         return NULL;
 648 }
 649
 650 #ifdef CONFIG_OF
 651 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 652                                         struct dsa_chip_data *cd,
 653                                         int chip_index, int port_index,
 654                                         struct device_node *link)
 655 {
 656         const __be32 *reg;
 657         int link_sw_addr;
 658         struct device_node *parent_sw;
 659         int len;
 660
 661         parent_sw = of_get_parent(link);
 662         if (!parent_sw)
 663                 return -EINVAL;
 664
 665         reg = of_get_property(parent_sw, "reg", &len);
 666         if (!reg || (len != sizeof(*reg) * 2))
 667                 return -EINVAL;
 668
 669         /*
 670          * Get the destination switch number from the second field of its 'reg'
 671          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 672          */
 673         link_sw_addr = be32_to_cpup(reg + 1);
 674
 675         if (link_sw_addr >= pd->nr_chips)
 676                 return -EINVAL;
 677
 678         cd->rtable[link_sw_addr] = port_index;
 679
 680         return 0;
 681 }
 682
 683 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 684                               struct dsa_chip_data *cd,
 685                               int chip_index, int port_index,
 686                               struct device_node *port,
 687                               const char *port_name)
 688 {
 689         struct device_node *link;
 690         int link_index;
 691         int ret;
 692
 693         for (link_index = 0;; link_index++) {
 694                 link = of_parse_phandle(port, "link", link_index);
 695                 if (!link)
 696                         break;
 697
 698                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 699                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 700                                                          port_index, link);
 701                         if (ret)
 702                                 return ret;
 703                 }
 704         }
 705         return 0;
 706 }
 707
 708 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 709 {
 710         int i;
 711         int port_index;
 712
 713         for (i = 0; i < pd->nr_chips; i++) {
 714                 port_index = 0;
 715                 while (port_index < DSA_MAX_PORTS) {
 716                         kfree(pd->chip[i].port_names[port_index]);
 717                         port_index++;
 718                 }
 719
 720                 /* Drop our reference to the MDIO bus device */
 721                 if (pd->chip[i].host_dev)
 722                         put_device(pd->chip[i].host_dev);
 723         }
 724         kfree(pd->chip);
 725 }
 726
 727 static int dsa_of_probe(struct device *dev)
 728 {
 729         struct device_node *np = dev->of_node;
 730         struct device_node *child, *mdio, *ethernet, *port;
 731         struct mii_bus *mdio_bus, *mdio_bus_switch;
 732         struct net_device *ethernet_dev;
 733         struct dsa_platform_data *pd;
 734         struct dsa_chip_data *cd;
 735         const char *port_name;
 736         int chip_index, port_index;
 737         const unsigned int *sw_addr, *port_reg;
 738         u32 eeprom_len;
 739         int ret;
 740
 741         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 742         if (!mdio)
 743                 return -EINVAL;
 744
 745         mdio_bus = of_mdio_find_bus(mdio);
 746         if (!mdio_bus)
 747                 return -EPROBE_DEFER;
 748
 749         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 750         if (!ethernet) {
 751                 ret = -EINVAL;
 752                 goto out_put_mdio;
 753         }
 754
 755         ethernet_dev = of_find_net_device_by_node(ethernet);
 756         if (!ethernet_dev) {
 757                 ret = -EPROBE_DEFER;
 758                 goto out_put_mdio;
 759         }
 760
 761         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 762         if (!pd) {
 763                 ret = -ENOMEM;
 764                 goto out_put_ethernet;
 765         }
 766
 767         dev->platform_data = pd;
 768         pd->of_netdev = ethernet_dev;
 769         pd->nr_chips = of_get_available_child_count(np);
 770         if (pd->nr_chips > DSA_MAX_SWITCHES)
 771                 pd->nr_chips = DSA_MAX_SWITCHES;
 772
 773         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 774                            GFP_KERNEL);
 775         if (!pd->chip) {
 776                 ret = -ENOMEM;
 777                 goto out_free;
 778         }
 779
 780         chip_index = -1;
 781         for_each_available_child_of_node(np, child) {
 782                 int i;
 783
 784                 chip_index++;
 785                 cd = &pd->chip[chip_index];
 786
 787                 cd->of_node = child;
 788
 789                 /* Initialize the routing table */
 790                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
 791                         cd->rtable[i] = DSA_RTABLE_NONE;
 792
 793                 /* When assigning the host device, increment its refcount */
 794                 cd->host_dev = get_device(&mdio_bus->dev);
 795
 796                 sw_addr = of_get_property(child, "reg", NULL);
 797                 if (!sw_addr)
 798                         continue;
 799
 800                 cd->sw_addr = be32_to_cpup(sw_addr);
 801                 if (cd->sw_addr >= PHY_MAX_ADDR)
 802                         continue;
 803
 804                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 805                         cd->eeprom_len = eeprom_len;
 806
 807                 mdio = of_parse_phandle(child, "mii-bus", 0);
 808                 if (mdio) {
 809                         mdio_bus_switch = of_mdio_find_bus(mdio);
 810                         if (!mdio_bus_switch) {
 811                                 ret = -EPROBE_DEFER;
 812                                 goto out_free_chip;
 813                         }
 814
 815                         /* Drop the mdio_bus device ref, replacing the host
 816                          * device with the mdio_bus_switch device, keeping
 817                          * the refcount from of_mdio_find_bus() above.
 818                          */
 819                         put_device(cd->host_dev);
 820                         cd->host_dev = &mdio_bus_switch->dev;
 821                 }
 822
 823                 for_each_available_child_of_node(child, port) {
 824                         port_reg = of_get_property(port, "reg", NULL);
 825                         if (!port_reg)
 826                                 continue;
 827
 828                         port_index = be32_to_cpup(port_reg);
 829                         if (port_index >= DSA_MAX_PORTS)
 830                                 break;
 831
 832                         port_name = of_get_property(port, "label", NULL);
 833                         if (!port_name)
 834                                 continue;
 835
 836                         cd->port_dn[port_index] = port;
 837
 838                         cd->port_names[port_index] = kstrdup(port_name,
 839                                         GFP_KERNEL);
 840                         if (!cd->port_names[port_index]) {
 841                                 ret = -ENOMEM;
 842                                 goto out_free_chip;
 843                         }
 844
 845                         ret = dsa_of_probe_links(pd, cd, chip_index,
 846                                                  port_index, port, port_name);
 847                         if (ret)
 848                                 goto out_free_chip;
 849
 850                 }
 851         }
 852
 853         /* The individual chips hold their own refcount on the mdio bus,
 854          * so drop ours */
 855         put_device(&mdio_bus->dev);
 856
 857         return 0;
 858
 859 out_free_chip:
 860         dsa_of_free_platform_data(pd);
 861 out_free:
 862         kfree(pd);
 863         dev->platform_data = NULL;
 864 out_put_ethernet:
 865         put_device(&ethernet_dev->dev);
 866 out_put_mdio:
 867         put_device(&mdio_bus->dev);
 868         return ret;
 869 }
 870
 871 static void dsa_of_remove(struct device *dev)
 872 {
 873         struct dsa_platform_data *pd = dev->platform_data;
 874
 875         if (!dev->of_node)
 876                 return;
 877
 878         dsa_of_free_platform_data(pd);
 879         put_device(&pd->of_netdev->dev);
 880         kfree(pd);
 881 }
 882 #else
 883 static inline int dsa_of_probe(struct device *dev)
 884 {
 885         return 0;
 886 }
 887
 888 static inline void dsa_of_remove(struct device *dev)
 889 {
 890 }
 891 #endif
 892
 893 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 894                          struct device *parent, struct dsa_platform_data *pd)
 895 {
 896         int i;
 897         unsigned configured = 0;
 898
 899         dst->pd = pd;
 900         dst->master_netdev = dev;
 901         dst->cpu_switch = -1;
 902         dst->cpu_port = -1;
 903
 904         for (i = 0; i < pd->nr_chips; i++) {
 905                 struct dsa_switch *ds;
 906
 907                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 908                 if (IS_ERR(ds)) {
 909                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 910                                    i, PTR_ERR(ds));
 911                         continue;
 912                 }
 913
 914                 dst->ds[i] = ds;
 915
 916                 ++configured;
 917         }
 918
 919         /*
 920          * If no switch was found, exit cleanly
 921          */
 922         if (!configured)
 923                 return -EPROBE_DEFER;
 924
 925         /*
 926          * If we use a tagging format that doesn't have an ethertype
 927          * field, make sure that all packets from this point on get
 928          * sent to the tag format's receive function.
 929          */
 930         wmb();
 931         dev->dsa_ptr = (void *)dst;
 932
 933         return 0;
 934 }
 935
 936 static int dsa_probe(struct platform_device *pdev)
 937 {
 938         struct dsa_platform_data *pd = pdev->dev.platform_data;
 939         struct net_device *dev;
 940         struct dsa_switch_tree *dst;
 941         int ret;
 942
 943         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 944                        dsa_driver_version);
 945
 946         if (pdev->dev.of_node) {
 947                 ret = dsa_of_probe(&pdev->dev);
 948                 if (ret)
 949                         return ret;
 950
 951                 pd = pdev->dev.platform_data;
 952         }
 953
 954         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 955                 return -EINVAL;
 956
 957         if (pd->of_netdev) {
 958                 dev = pd->of_netdev;
 959                 dev_hold(dev);
 960         } else {
 961                 dev = dev_to_net_device(pd->netdev);
 962         }
 963         if (dev == NULL) {
 964                 ret = -EPROBE_DEFER;
 965                 goto out;
 966         }
 967
 968         if (dev->dsa_ptr != NULL) {
 969                 dev_put(dev);
 970                 ret = -EEXIST;
 971                 goto out;
 972         }
 973
 974         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 975         if (dst == NULL) {
 976                 dev_put(dev);
 977                 ret = -ENOMEM;
 978                 goto out;
 979         }
 980
 981         platform_set_drvdata(pdev, dst);
 982
 983         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 984         if (ret) {
 985                 dev_put(dev);
 986                 goto out;
 987         }
 988
 989         return 0;
 990
 991 out:
 992         dsa_of_remove(&pdev->dev);
 993
 994         return ret;
 995 }
 996
 997 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 998 {
 999         int i;
1000
1001         dst->master_netdev->dsa_ptr = NULL;
1002
1003         /* If we used a tagging format that doesn't have an ethertype
1004          * field, make sure that all packets from this point get sent
1005          * without the tag and go through the regular receive path.
1006          */
1007         wmb();
1008
1009         for (i = 0; i < dst->pd->nr_chips; i++) {
1010                 struct dsa_switch *ds = dst->ds[i];
1011
1012                 if (ds)
1013                         dsa_switch_destroy(ds);
1014         }
1015
1016         dsa_cpu_port_ethtool_restore(dst->ds[0]);
1017
1018         dev_put(dst->master_netdev);
1019 }
1020
1021 static int dsa_remove(struct platform_device *pdev)
1022 {
1023         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1024
1025         dsa_remove_dst(dst);
1026         dsa_of_remove(&pdev->dev);
1027
1028         return 0;
1029 }
1030
1031 static void dsa_shutdown(struct platform_device *pdev)
1032 {
1033 }
1034
1035 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
1036                           struct packet_type *pt, struct net_device *orig_dev)
1037 {
1038         struct dsa_switch_tree *dst = dev->dsa_ptr;
1039
1040         if (unlikely(dst == NULL)) {
1041                 kfree_skb(skb);
1042                 return 0;
1043         }
1044
1045         return dst->rcv(skb, dev, pt, orig_dev);
1046 }
1047
1048 static struct packet_type dsa_pack_type __read_mostly = {
1049         .type   = cpu_to_be16(ETH_P_XDSA),
1050         .func   = dsa_switch_rcv,
1051 };
1052
1053 static struct notifier_block dsa_netdevice_nb __read_mostly = {
1054         .notifier_call  = dsa_slave_netdevice_event,
1055 };
1056
1057 #ifdef CONFIG_PM_SLEEP
1058 static int dsa_suspend(struct device *d)
1059 {
1060         struct platform_device *pdev = to_platform_device(d);
1061         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1062         int i, ret = 0;
1063
1064         for (i = 0; i < dst->pd->nr_chips; i++) {
1065                 struct dsa_switch *ds = dst->ds[i];
1066
1067                 if (ds != NULL)
1068                         ret = dsa_switch_suspend(ds);
1069         }
1070
1071         return ret;
1072 }
1073
1074 static int dsa_resume(struct device *d)
1075 {
1076         struct platform_device *pdev = to_platform_device(d);
1077         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1078         int i, ret = 0;
1079
1080         for (i = 0; i < dst->pd->nr_chips; i++) {
1081                 struct dsa_switch *ds = dst->ds[i];
1082
1083                 if (ds != NULL)
1084                         ret = dsa_switch_resume(ds);
1085         }
1086
1087         return ret;
1088 }
1089 #endif
1090
1091 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1092
1093 static const struct of_device_id dsa_of_match_table[] = {
1094         { .compatible = "marvell,dsa", },
1095         {}
1096 };
1097 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1098
1099 static struct platform_driver dsa_driver = {
1100         .probe          = dsa_probe,
1101         .remove         = dsa_remove,
1102         .shutdown       = dsa_shutdown,
1103         .driver = {
1104                 .name   = "dsa",
1105                 .of_match_table = dsa_of_match_table,
1106                 .pm     = &dsa_pm_ops,
1107         },
1108 };
1109
1110 static int __init dsa_init_module(void)
1111 {
1112         int rc;
1113
1114         register_netdevice_notifier(&dsa_netdevice_nb);
1115
1116         rc = platform_driver_register(&dsa_driver);
1117         if (rc)
1118                 return rc;
1119
1120         dev_add_pack(&dsa_pack_type);
1121
1122         return 0;
1123 }
1124 module_init(dsa_init_module);
1125
1126 static void __exit dsa_cleanup_module(void)
1127 {
1128         unregister_netdevice_notifier(&dsa_netdevice_nb);
1129         dev_remove_pack(&dsa_pack_type);
1130         platform_driver_unregister(&dsa_driver);
1131 }
1132 module_exit(dsa_cleanup_module);
1133
1134 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1135 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1136 MODULE_LICENSE("GPL");
1137 MODULE_ALIAS("platform:dsa");