net/dsa/legacy.c

   1 /*
   2  * net/dsa/legacy.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 <linux/of.h>
  18 #include <linux/of_mdio.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/of_net.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/sysfs.h>
  23 #include <linux/phy_fixed.h>
  24 #include <linux/etherdevice.h>
  25
  26 #include "dsa_priv.h"
  27
  28 /* switch driver registration ***********************************************/
  29 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  30 static LIST_HEAD(dsa_switch_drivers);
  31
  32 void register_switch_driver(struct dsa_switch_driver *drv)
  33 {
  34         mutex_lock(&dsa_switch_drivers_mutex);
  35         list_add_tail(&drv->list, &dsa_switch_drivers);
  36         mutex_unlock(&dsa_switch_drivers_mutex);
  37 }
  38 EXPORT_SYMBOL_GPL(register_switch_driver);
  39
  40 void unregister_switch_driver(struct dsa_switch_driver *drv)
  41 {
  42         mutex_lock(&dsa_switch_drivers_mutex);
  43         list_del_init(&drv->list);
  44         mutex_unlock(&dsa_switch_drivers_mutex);
  45 }
  46 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  47
  48 static const struct dsa_switch_ops *
  49 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
  50                  const char **_name, void **priv)
  51 {
  52         const struct dsa_switch_ops *ret;
  53         struct list_head *list;
  54         const char *name;
  55
  56         ret = NULL;
  57         name = NULL;
  58
  59         mutex_lock(&dsa_switch_drivers_mutex);
  60         list_for_each(list, &dsa_switch_drivers) {
  61                 const struct dsa_switch_ops *ops;
  62                 struct dsa_switch_driver *drv;
  63
  64                 drv = list_entry(list, struct dsa_switch_driver, list);
  65                 ops = drv->ops;
  66
  67                 name = ops->probe(parent, host_dev, sw_addr, priv);
  68                 if (name != NULL) {
  69                         ret = ops;
  70                         break;
  71                 }
  72         }
  73         mutex_unlock(&dsa_switch_drivers_mutex);
  74
  75         *_name = name;
  76
  77         return ret;
  78 }
  79
  80 /* basic switch operations **************************************************/
  81 static int dsa_cpu_dsa_setups(struct dsa_switch *ds)
  82 {
  83         int ret, port;
  84
  85         for (port = 0; port < ds->num_ports; port++) {
  86                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
  87                         continue;
  88
  89                 ret = dsa_cpu_dsa_setup(&ds->ports[port]);
  90                 if (ret)
  91                         return ret;
  92         }
  93         return 0;
  94 }
  95
  96 static int dsa_switch_setup_one(struct dsa_switch *ds,
  97                                 struct net_device *master)
  98 {
  99         const struct dsa_switch_ops *ops = ds->ops;
 100         struct dsa_switch_tree *dst = ds->dst;
 101         struct dsa_chip_data *cd = ds->cd;
 102         bool valid_name_found = false;
 103         int index = ds->index;
 104         int i, ret;
 105
 106         /*
 107          * Validate supplied switch configuration.
 108          */
 109         for (i = 0; i < ds->num_ports; i++) {
 110                 char *name;
 111
 112                 name = cd->port_names[i];
 113                 if (name == NULL)
 114                         continue;
 115
 116                 if (!strcmp(name, "cpu")) {
 117                         if (dst->cpu_dp) {
 118                                 netdev_err(master,
 119                                            "multiple cpu ports?!\n");
 120                                 return -EINVAL;
 121                         }
 122                         dst->cpu_dp = &ds->ports[i];
 123                         dst->cpu_dp->netdev = master;
 124                         ds->cpu_port_mask |= 1 << i;
 125                 } else if (!strcmp(name, "dsa")) {
 126                         ds->dsa_port_mask |= 1 << i;
 127                 } else {
 128                         ds->enabled_port_mask |= 1 << i;
 129                 }
 130                 valid_name_found = true;
 131         }
 132
 133         if (!valid_name_found && i == ds->num_ports)
 134                 return -EINVAL;
 135
 136         /* Make the built-in MII bus mask match the number of ports,
 137          * switch drivers can override this later
 138          */
 139         ds->phys_mii_mask = ds->enabled_port_mask;
 140
 141         /*
 142          * If the CPU connects to this switch, set the switch tree
 143          * tagging protocol to the preferred tagging format of this
 144          * switch.
 145          */
 146         if (dst->cpu_dp->ds == ds) {
 147                 const struct dsa_device_ops *tag_ops;
 148                 enum dsa_tag_protocol tag_protocol;
 149
 150                 tag_protocol = ops->get_tag_protocol(ds);
 151                 tag_ops = dsa_resolve_tag_protocol(tag_protocol);
 152                 if (IS_ERR(tag_ops))
 153                         return PTR_ERR(tag_ops);
 154
 155                 dst->cpu_dp->tag_ops = tag_ops;
 156
 157                 /* Few copies for faster access in master receive hot path */
 158                 dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
 159                 dst->cpu_dp->dst = dst;
 160         }
 161
 162         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 163
 164         /*
 165          * Do basic register setup.
 166          */
 167         ret = ops->setup(ds);
 168         if (ret < 0)
 169                 return ret;
 170
 171         ret = dsa_switch_register_notifier(ds);
 172         if (ret)
 173                 return ret;
 174
 175         if (ops->set_addr) {
 176                 ret = ops->set_addr(ds, master->dev_addr);
 177                 if (ret < 0)
 178                         return ret;
 179         }
 180
 181         if (!ds->slave_mii_bus && ops->phy_read) {
 182                 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
 183                 if (!ds->slave_mii_bus)
 184                         return -ENOMEM;
 185                 dsa_slave_mii_bus_init(ds);
 186
 187                 ret = mdiobus_register(ds->slave_mii_bus);
 188                 if (ret < 0)
 189                         return ret;
 190         }
 191
 192         /*
 193          * Create network devices for physical switch ports.
 194          */
 195         for (i = 0; i < ds->num_ports; i++) {
 196                 ds->ports[i].dn = cd->port_dn[i];
 197                 ds->ports[i].cpu_dp = dst->cpu_dp;
 198
 199                 if (!(ds->enabled_port_mask & (1 << i)))
 200                         continue;
 201
 202                 ret = dsa_slave_create(&ds->ports[i], cd->port_names[i]);
 203                 if (ret < 0)
 204                         netdev_err(master, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 205                                    index, i, cd->port_names[i], ret);
 206         }
 207
 208         /* Perform configuration of the CPU and DSA ports */
 209         ret = dsa_cpu_dsa_setups(ds);
 210         if (ret < 0)
 211                 netdev_err(master, "[%d] : can't configure CPU and DSA ports\n",
 212                            index);
 213
 214         return 0;
 215 }
 216
 217 static struct dsa_switch *
 218 dsa_switch_setup(struct dsa_switch_tree *dst, struct net_device *master,
 219                  int index, struct device *parent, struct device *host_dev)
 220 {
 221         struct dsa_chip_data *cd = dst->pd->chip + index;
 222         const struct dsa_switch_ops *ops;
 223         struct dsa_switch *ds;
 224         int ret;
 225         const char *name;
 226         void *priv;
 227
 228         /*
 229          * Probe for switch model.
 230          */
 231         ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 232         if (!ops) {
 233                 netdev_err(master, "[%d]: could not detect attached switch\n",
 234                            index);
 235                 return ERR_PTR(-EINVAL);
 236         }
 237         netdev_info(master, "[%d]: detected a %s switch\n",
 238                     index, name);
 239
 240
 241         /*
 242          * Allocate and initialise switch state.
 243          */
 244         ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
 245         if (!ds)
 246                 return ERR_PTR(-ENOMEM);
 247
 248         ds->dst = dst;
 249         ds->index = index;
 250         ds->cd = cd;
 251         ds->ops = ops;
 252         ds->priv = priv;
 253
 254         ret = dsa_switch_setup_one(ds, master);
 255         if (ret)
 256                 return ERR_PTR(ret);
 257
 258         return ds;
 259 }
 260
 261 static void dsa_switch_destroy(struct dsa_switch *ds)
 262 {
 263         int port;
 264
 265         /* Destroy network devices for physical switch ports. */
 266         for (port = 0; port < ds->num_ports; port++) {
 267                 if (!(ds->enabled_port_mask & (1 << port)))
 268                         continue;
 269
 270                 if (!ds->ports[port].netdev)
 271                         continue;
 272
 273                 dsa_slave_destroy(ds->ports[port].netdev);
 274         }
 275
 276         /* Disable configuration of the CPU and DSA ports */
 277         for (port = 0; port < ds->num_ports; port++) {
 278                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 279                         continue;
 280                 dsa_cpu_dsa_destroy(&ds->ports[port]);
 281
 282                 /* Clearing a bit which is not set does no harm */
 283                 ds->cpu_port_mask |= ~(1 << port);
 284                 ds->dsa_port_mask |= ~(1 << port);
 285         }
 286
 287         if (ds->slave_mii_bus && ds->ops->phy_read)
 288                 mdiobus_unregister(ds->slave_mii_bus);
 289
 290         dsa_switch_unregister_notifier(ds);
 291 }
 292
 293 /* platform driver init and cleanup *****************************************/
 294 static int dev_is_class(struct device *dev, void *class)
 295 {
 296         if (dev->class != NULL && !strcmp(dev->class->name, class))
 297                 return 1;
 298
 299         return 0;
 300 }
 301
 302 static struct device *dev_find_class(struct device *parent, char *class)
 303 {
 304         if (dev_is_class(parent, class)) {
 305                 get_device(parent);
 306                 return parent;
 307         }
 308
 309         return device_find_child(parent, class, dev_is_class);
 310 }
 311
 312 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 313 {
 314         struct device *d;
 315
 316         d = dev_find_class(dev, "mdio_bus");
 317         if (d != NULL) {
 318                 struct mii_bus *bus;
 319
 320                 bus = to_mii_bus(d);
 321                 put_device(d);
 322
 323                 return bus;
 324         }
 325
 326         return NULL;
 327 }
 328 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 329
 330 #ifdef CONFIG_OF
 331 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 332                                         struct dsa_chip_data *cd,
 333                                         int chip_index, int port_index,
 334                                         struct device_node *link)
 335 {
 336         const __be32 *reg;
 337         int link_sw_addr;
 338         struct device_node *parent_sw;
 339         int len;
 340
 341         parent_sw = of_get_parent(link);
 342         if (!parent_sw)
 343                 return -EINVAL;
 344
 345         reg = of_get_property(parent_sw, "reg", &len);
 346         if (!reg || (len != sizeof(*reg) * 2))
 347                 return -EINVAL;
 348
 349         /*
 350          * Get the destination switch number from the second field of its 'reg'
 351          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 352          */
 353         link_sw_addr = be32_to_cpup(reg + 1);
 354
 355         if (link_sw_addr >= pd->nr_chips)
 356                 return -EINVAL;
 357
 358         cd->rtable[link_sw_addr] = port_index;
 359
 360         return 0;
 361 }
 362
 363 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 364                               struct dsa_chip_data *cd,
 365                               int chip_index, int port_index,
 366                               struct device_node *port,
 367                               const char *port_name)
 368 {
 369         struct device_node *link;
 370         int link_index;
 371         int ret;
 372
 373         for (link_index = 0;; link_index++) {
 374                 link = of_parse_phandle(port, "link", link_index);
 375                 if (!link)
 376                         break;
 377
 378                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 379                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 380                                                          port_index, link);
 381                         if (ret)
 382                                 return ret;
 383                 }
 384         }
 385         return 0;
 386 }
 387
 388 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 389 {
 390         int i;
 391         int port_index;
 392
 393         for (i = 0; i < pd->nr_chips; i++) {
 394                 port_index = 0;
 395                 while (port_index < DSA_MAX_PORTS) {
 396                         kfree(pd->chip[i].port_names[port_index]);
 397                         port_index++;
 398                 }
 399
 400                 /* Drop our reference to the MDIO bus device */
 401                 if (pd->chip[i].host_dev)
 402                         put_device(pd->chip[i].host_dev);
 403         }
 404         kfree(pd->chip);
 405 }
 406
 407 static int dsa_of_probe(struct device *dev)
 408 {
 409         struct device_node *np = dev->of_node;
 410         struct device_node *child, *mdio, *ethernet, *port;
 411         struct mii_bus *mdio_bus, *mdio_bus_switch;
 412         struct net_device *ethernet_dev;
 413         struct dsa_platform_data *pd;
 414         struct dsa_chip_data *cd;
 415         const char *port_name;
 416         int chip_index, port_index;
 417         const unsigned int *sw_addr, *port_reg;
 418         u32 eeprom_len;
 419         int ret;
 420
 421         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 422         if (!mdio)
 423                 return -EINVAL;
 424
 425         mdio_bus = of_mdio_find_bus(mdio);
 426         if (!mdio_bus)
 427                 return -EPROBE_DEFER;
 428
 429         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 430         if (!ethernet) {
 431                 ret = -EINVAL;
 432                 goto out_put_mdio;
 433         }
 434
 435         ethernet_dev = of_find_net_device_by_node(ethernet);
 436         if (!ethernet_dev) {
 437                 ret = -EPROBE_DEFER;
 438                 goto out_put_mdio;
 439         }
 440
 441         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 442         if (!pd) {
 443                 ret = -ENOMEM;
 444                 goto out_put_ethernet;
 445         }
 446
 447         dev->platform_data = pd;
 448         pd->of_netdev = ethernet_dev;
 449         pd->nr_chips = of_get_available_child_count(np);
 450         if (pd->nr_chips > DSA_MAX_SWITCHES)
 451                 pd->nr_chips = DSA_MAX_SWITCHES;
 452
 453         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 454                            GFP_KERNEL);
 455         if (!pd->chip) {
 456                 ret = -ENOMEM;
 457                 goto out_free;
 458         }
 459
 460         chip_index = -1;
 461         for_each_available_child_of_node(np, child) {
 462                 int i;
 463
 464                 chip_index++;
 465                 cd = &pd->chip[chip_index];
 466
 467                 cd->of_node = child;
 468
 469                 /* Initialize the routing table */
 470                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
 471                         cd->rtable[i] = DSA_RTABLE_NONE;
 472
 473                 /* When assigning the host device, increment its refcount */
 474                 cd->host_dev = get_device(&mdio_bus->dev);
 475
 476                 sw_addr = of_get_property(child, "reg", NULL);
 477                 if (!sw_addr)
 478                         continue;
 479
 480                 cd->sw_addr = be32_to_cpup(sw_addr);
 481                 if (cd->sw_addr >= PHY_MAX_ADDR)
 482                         continue;
 483
 484                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 485                         cd->eeprom_len = eeprom_len;
 486
 487                 mdio = of_parse_phandle(child, "mii-bus", 0);
 488                 if (mdio) {
 489                         mdio_bus_switch = of_mdio_find_bus(mdio);
 490                         if (!mdio_bus_switch) {
 491                                 ret = -EPROBE_DEFER;
 492                                 goto out_free_chip;
 493                         }
 494
 495                         /* Drop the mdio_bus device ref, replacing the host
 496                          * device with the mdio_bus_switch device, keeping
 497                          * the refcount from of_mdio_find_bus() above.
 498                          */
 499                         put_device(cd->host_dev);
 500                         cd->host_dev = &mdio_bus_switch->dev;
 501                 }
 502
 503                 for_each_available_child_of_node(child, port) {
 504                         port_reg = of_get_property(port, "reg", NULL);
 505                         if (!port_reg)
 506                                 continue;
 507
 508                         port_index = be32_to_cpup(port_reg);
 509                         if (port_index >= DSA_MAX_PORTS)
 510                                 break;
 511
 512                         port_name = of_get_property(port, "label", NULL);
 513                         if (!port_name)
 514                                 continue;
 515
 516                         cd->port_dn[port_index] = port;
 517
 518                         cd->port_names[port_index] = kstrdup(port_name,
 519                                         GFP_KERNEL);
 520                         if (!cd->port_names[port_index]) {
 521                                 ret = -ENOMEM;
 522                                 goto out_free_chip;
 523                         }
 524
 525                         ret = dsa_of_probe_links(pd, cd, chip_index,
 526                                                  port_index, port, port_name);
 527                         if (ret)
 528                                 goto out_free_chip;
 529
 530                 }
 531         }
 532
 533         /* The individual chips hold their own refcount on the mdio bus,
 534          * so drop ours */
 535         put_device(&mdio_bus->dev);
 536
 537         return 0;
 538
 539 out_free_chip:
 540         dsa_of_free_platform_data(pd);
 541 out_free:
 542         kfree(pd);
 543         dev->platform_data = NULL;
 544 out_put_ethernet:
 545         put_device(&ethernet_dev->dev);
 546 out_put_mdio:
 547         put_device(&mdio_bus->dev);
 548         return ret;
 549 }
 550
 551 static void dsa_of_remove(struct device *dev)
 552 {
 553         struct dsa_platform_data *pd = dev->platform_data;
 554
 555         if (!dev->of_node)
 556                 return;
 557
 558         dsa_of_free_platform_data(pd);
 559         put_device(&pd->of_netdev->dev);
 560         kfree(pd);
 561 }
 562 #else
 563 static inline int dsa_of_probe(struct device *dev)
 564 {
 565         return 0;
 566 }
 567
 568 static inline void dsa_of_remove(struct device *dev)
 569 {
 570 }
 571 #endif
 572
 573 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 574                          struct device *parent, struct dsa_platform_data *pd)
 575 {
 576         int i;
 577         unsigned configured = 0;
 578
 579         dst->pd = pd;
 580
 581         for (i = 0; i < pd->nr_chips; i++) {
 582                 struct dsa_switch *ds;
 583
 584                 ds = dsa_switch_setup(dst, dev, i, parent, pd->chip[i].host_dev);
 585                 if (IS_ERR(ds)) {
 586                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 587                                    i, PTR_ERR(ds));
 588                         continue;
 589                 }
 590
 591                 dst->ds[i] = ds;
 592
 593                 ++configured;
 594         }
 595
 596         /*
 597          * If no switch was found, exit cleanly
 598          */
 599         if (!configured)
 600                 return -EPROBE_DEFER;
 601
 602         /*
 603          * If we use a tagging format that doesn't have an ethertype
 604          * field, make sure that all packets from this point on get
 605          * sent to the tag format's receive function.
 606          */
 607         wmb();
 608         dev->dsa_ptr = dst->cpu_dp;
 609
 610         return dsa_master_ethtool_setup(dst->cpu_dp->netdev);
 611 }
 612
 613 static int dsa_probe(struct platform_device *pdev)
 614 {
 615         struct dsa_platform_data *pd = pdev->dev.platform_data;
 616         struct net_device *dev;
 617         struct dsa_switch_tree *dst;
 618         int ret;
 619
 620         if (pdev->dev.of_node) {
 621                 ret = dsa_of_probe(&pdev->dev);
 622                 if (ret)
 623                         return ret;
 624
 625                 pd = pdev->dev.platform_data;
 626         }
 627
 628         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 629                 return -EINVAL;
 630
 631         if (pd->of_netdev) {
 632                 dev = pd->of_netdev;
 633                 dev_hold(dev);
 634         } else {
 635                 dev = dsa_dev_to_net_device(pd->netdev);
 636         }
 637         if (dev == NULL) {
 638                 ret = -EPROBE_DEFER;
 639                 goto out;
 640         }
 641
 642         if (dev->dsa_ptr != NULL) {
 643                 dev_put(dev);
 644                 ret = -EEXIST;
 645                 goto out;
 646         }
 647
 648         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 649         if (dst == NULL) {
 650                 dev_put(dev);
 651                 ret = -ENOMEM;
 652                 goto out;
 653         }
 654
 655         platform_set_drvdata(pdev, dst);
 656
 657         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 658         if (ret) {
 659                 dev_put(dev);
 660                 goto out;
 661         }
 662
 663         return 0;
 664
 665 out:
 666         dsa_of_remove(&pdev->dev);
 667
 668         return ret;
 669 }
 670
 671 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 672 {
 673         int i;
 674
 675         dsa_master_ethtool_restore(dst->cpu_dp->netdev);
 676
 677         dst->cpu_dp->netdev->dsa_ptr = NULL;
 678
 679         /* If we used a tagging format that doesn't have an ethertype
 680          * field, make sure that all packets from this point get sent
 681          * without the tag and go through the regular receive path.
 682          */
 683         wmb();
 684
 685         for (i = 0; i < dst->pd->nr_chips; i++) {
 686                 struct dsa_switch *ds = dst->ds[i];
 687
 688                 if (ds)
 689                         dsa_switch_destroy(ds);
 690         }
 691
 692         dev_put(dst->cpu_dp->netdev);
 693 }
 694
 695 static int dsa_remove(struct platform_device *pdev)
 696 {
 697         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 698
 699         dsa_remove_dst(dst);
 700         dsa_of_remove(&pdev->dev);
 701
 702         return 0;
 703 }
 704
 705 static void dsa_shutdown(struct platform_device *pdev)
 706 {
 707 }
 708
 709 #ifdef CONFIG_PM_SLEEP
 710 static int dsa_suspend(struct device *d)
 711 {
 712         struct platform_device *pdev = to_platform_device(d);
 713         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 714         int i, ret = 0;
 715
 716         for (i = 0; i < dst->pd->nr_chips; i++) {
 717                 struct dsa_switch *ds = dst->ds[i];
 718
 719                 if (ds != NULL)
 720                         ret = dsa_switch_suspend(ds);
 721         }
 722
 723         return ret;
 724 }
 725
 726 static int dsa_resume(struct device *d)
 727 {
 728         struct platform_device *pdev = to_platform_device(d);
 729         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 730         int i, ret = 0;
 731
 732         for (i = 0; i < dst->pd->nr_chips; i++) {
 733                 struct dsa_switch *ds = dst->ds[i];
 734
 735                 if (ds != NULL)
 736                         ret = dsa_switch_resume(ds);
 737         }
 738
 739         return ret;
 740 }
 741 #endif
 742
 743 /* legacy way, bypassing the bridge *****************************************/
 744 int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 745                        struct net_device *dev,
 746                        const unsigned char *addr, u16 vid,
 747                        u16 flags)
 748 {
 749         struct dsa_slave_priv *p = netdev_priv(dev);
 750         struct dsa_port *dp = p->dp;
 751
 752         return dsa_port_fdb_add(dp, addr, vid);
 753 }
 754
 755 int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
 756                        struct net_device *dev,
 757                        const unsigned char *addr, u16 vid)
 758 {
 759         struct dsa_slave_priv *p = netdev_priv(dev);
 760         struct dsa_port *dp = p->dp;
 761
 762         return dsa_port_fdb_del(dp, addr, vid);
 763 }
 764
 765 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 766
 767 static const struct of_device_id dsa_of_match_table[] = {
 768         { .compatible = "marvell,dsa", },
 769         {}
 770 };
 771 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
 772
 773 static struct platform_driver dsa_driver = {
 774         .probe          = dsa_probe,
 775         .remove         = dsa_remove,
 776         .shutdown       = dsa_shutdown,
 777         .driver = {
 778                 .name   = "dsa",
 779                 .of_match_table = dsa_of_match_table,
 780                 .pm     = &dsa_pm_ops,
 781         },
 782 };
 783
 784 int dsa_legacy_register(void)
 785 {
 786         return platform_driver_register(&dsa_driver);
 787 }
 788
 789 void dsa_legacy_unregister(void)
 790 {
 791         platform_driver_unregister(&dsa_driver);
 792 }