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