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