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 #include <net/dsa.h>
  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, struct device *dev)
  82 {
  83         struct dsa_port *dport;
  84         int ret, port;
  85
  86         for (port = 0; port < ds->num_ports; port++) {
  87                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
  88                         continue;
  89
  90                 dport = &ds->ports[port];
  91                 ret = dsa_cpu_dsa_setup(ds, dev, dport, port);
  92                 if (ret)
  93                         return ret;
  94         }
  95         return 0;
  96 }
  97
  98 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
  99 {
 100         const struct dsa_switch_ops *ops = ds->ops;
 101         struct dsa_switch_tree *dst = ds->dst;
 102         struct dsa_chip_data *cd = ds->cd;
 103         bool valid_name_found = false;
 104         int index = ds->index;
 105         int i, ret;
 106
 107         /*
 108          * Validate supplied switch configuration.
 109          */
 110         for (i = 0; i < ds->num_ports; i++) {
 111                 char *name;
 112
 113                 name = cd->port_names[i];
 114                 if (name == NULL)
 115                         continue;
 116
 117                 if (!strcmp(name, "cpu")) {
 118                         if (dst->cpu_switch) {
 119                                 netdev_err(dst->master_netdev,
 120                                            "multiple cpu ports?!\n");
 121                                 return -EINVAL;
 122                         }
 123                         dst->cpu_switch = ds;
 124                         dst->cpu_port = i;
 125                         ds->cpu_port_mask |= 1 << i;
 126                 } else if (!strcmp(name, "dsa")) {
 127                         ds->dsa_port_mask |= 1 << i;
 128                 } else {
 129                         ds->enabled_port_mask |= 1 << i;
 130                 }
 131                 valid_name_found = true;
 132         }
 133
 134         if (!valid_name_found && i == ds->num_ports)
 135                 return -EINVAL;
 136
 137         /* Make the built-in MII bus mask match the number of ports,
 138          * switch drivers can override this later
 139          */
 140         ds->phys_mii_mask = ds->enabled_port_mask;
 141
 142         /*
 143          * If the CPU connects to this switch, set the switch tree
 144          * tagging protocol to the preferred tagging format of this
 145          * switch.
 146          */
 147         if (dst->cpu_switch == ds) {
 148                 enum dsa_tag_protocol tag_protocol;
 149
 150                 tag_protocol = ops->get_tag_protocol(ds);
 151                 dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
 152                 if (IS_ERR(dst->tag_ops))
 153                         return PTR_ERR(dst->tag_ops);
 154
 155                 dst->rcv = dst->tag_ops->rcv;
 156         }
 157
 158         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 159
 160         /*
 161          * Do basic register setup.
 162          */
 163         ret = ops->setup(ds);
 164         if (ret < 0)
 165                 return ret;
 166
 167         ret = dsa_switch_register_notifier(ds);
 168         if (ret)
 169                 return ret;
 170
 171         if (ops->set_addr) {
 172                 ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
 173                 if (ret < 0)
 174                         return ret;
 175         }
 176
 177         if (!ds->slave_mii_bus && ops->phy_read) {
 178                 ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 179                 if (!ds->slave_mii_bus)
 180                         return -ENOMEM;
 181                 dsa_slave_mii_bus_init(ds);
 182
 183                 ret = mdiobus_register(ds->slave_mii_bus);
 184                 if (ret < 0)
 185                         return ret;
 186         }
 187
 188         /*
 189          * Create network devices for physical switch ports.
 190          */
 191         for (i = 0; i < ds->num_ports; i++) {
 192                 ds->ports[i].dn = cd->port_dn[i];
 193
 194                 if (!(ds->enabled_port_mask & (1 << i)))
 195                         continue;
 196
 197                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 198                 if (ret < 0)
 199                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 200                                    index, i, cd->port_names[i], ret);
 201         }
 202
 203         /* Perform configuration of the CPU and DSA ports */
 204         ret = dsa_cpu_dsa_setups(ds, parent);
 205         if (ret < 0)
 206                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 207                            index);
 208
 209         ret = dsa_cpu_port_ethtool_setup(ds);
 210         if (ret)
 211                 return ret;
 212
 213         return 0;
 214 }
 215
 216 static struct dsa_switch *
 217 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 218                  struct device *parent, struct device *host_dev)
 219 {
 220         struct dsa_chip_data *cd = dst->pd->chip + index;
 221         const struct dsa_switch_ops *ops;
 222         struct dsa_switch *ds;
 223         int ret;
 224         const char *name;
 225         void *priv;
 226
 227         /*
 228          * Probe for switch model.
 229          */
 230         ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 231         if (!ops) {
 232                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 233                            index);
 234                 return ERR_PTR(-EINVAL);
 235         }
 236         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 237                     index, name);
 238
 239
 240         /*
 241          * Allocate and initialise switch state.
 242          */
 243         ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
 244         if (!ds)
 245                 return ERR_PTR(-ENOMEM);
 246
 247         ds->dst = dst;
 248         ds->index = index;
 249         ds->cd = cd;
 250         ds->ops = ops;
 251         ds->priv = priv;
 252
 253         ret = dsa_switch_setup_one(ds, parent);
 254         if (ret)
 255                 return ERR_PTR(ret);
 256
 257         return ds;
 258 }
 259
 260 static void dsa_switch_destroy(struct dsa_switch *ds)
 261 {
 262         int port;
 263
 264         /* Destroy network devices for physical switch ports. */
 265         for (port = 0; port < ds->num_ports; port++) {
 266                 if (!(ds->enabled_port_mask & (1 << port)))
 267                         continue;
 268
 269                 if (!ds->ports[port].netdev)
 270                         continue;
 271
 272                 dsa_slave_destroy(ds->ports[port].netdev);
 273         }
 274
 275         /* Disable configuration of the CPU and DSA ports */
 276         for (port = 0; port < ds->num_ports; port++) {
 277                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 278                         continue;
 279                 dsa_cpu_dsa_destroy(&ds->ports[port]);
 280
 281                 /* Clearing a bit which is not set does no harm */
 282                 ds->cpu_port_mask |= ~(1 << port);
 283                 ds->dsa_port_mask |= ~(1 << port);
 284         }
 285
 286         if (ds->slave_mii_bus && ds->ops->phy_read)
 287                 mdiobus_unregister(ds->slave_mii_bus);
 288
 289         dsa_switch_unregister_notifier(ds);
 290 }
 291
 292 #ifdef CONFIG_PM_SLEEP
 293 int dsa_switch_suspend(struct dsa_switch *ds)
 294 {
 295         int i, ret = 0;
 296
 297         /* Suspend slave network devices */
 298         for (i = 0; i < ds->num_ports; i++) {
 299                 if (!dsa_is_port_initialized(ds, i))
 300                         continue;
 301
 302                 ret = dsa_slave_suspend(ds->ports[i].netdev);
 303                 if (ret)
 304                         return ret;
 305         }
 306
 307         if (ds->ops->suspend)
 308                 ret = ds->ops->suspend(ds);
 309
 310         return ret;
 311 }
 312 EXPORT_SYMBOL_GPL(dsa_switch_suspend);
 313
 314 int dsa_switch_resume(struct dsa_switch *ds)
 315 {
 316         int i, ret = 0;
 317
 318         if (ds->ops->resume)
 319                 ret = ds->ops->resume(ds);
 320
 321         if (ret)
 322                 return ret;
 323
 324         /* Resume slave network devices */
 325         for (i = 0; i < ds->num_ports; i++) {
 326                 if (!dsa_is_port_initialized(ds, i))
 327                         continue;
 328
 329                 ret = dsa_slave_resume(ds->ports[i].netdev);
 330                 if (ret)
 331                         return ret;
 332         }
 333
 334         return 0;
 335 }
 336 EXPORT_SYMBOL_GPL(dsa_switch_resume);
 337 #endif
 338
 339 /* platform driver init and cleanup *****************************************/
 340 static int dev_is_class(struct device *dev, void *class)
 341 {
 342         if (dev->class != NULL && !strcmp(dev->class->name, class))
 343                 return 1;
 344
 345         return 0;
 346 }
 347
 348 static struct device *dev_find_class(struct device *parent, char *class)
 349 {
 350         if (dev_is_class(parent, class)) {
 351                 get_device(parent);
 352                 return parent;
 353         }
 354
 355         return device_find_child(parent, class, dev_is_class);
 356 }
 357
 358 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 359 {
 360         struct device *d;
 361
 362         d = dev_find_class(dev, "mdio_bus");
 363         if (d != NULL) {
 364                 struct mii_bus *bus;
 365
 366                 bus = to_mii_bus(d);
 367                 put_device(d);
 368
 369                 return bus;
 370         }
 371
 372         return NULL;
 373 }
 374 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 375
 376 #ifdef CONFIG_OF
 377 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 378                                         struct dsa_chip_data *cd,
 379                                         int chip_index, int port_index,
 380                                         struct device_node *link)
 381 {
 382         const __be32 *reg;
 383         int link_sw_addr;
 384         struct device_node *parent_sw;
 385         int len;
 386
 387         parent_sw = of_get_parent(link);
 388         if (!parent_sw)
 389                 return -EINVAL;
 390
 391         reg = of_get_property(parent_sw, "reg", &len);
 392         if (!reg || (len != sizeof(*reg) * 2))
 393                 return -EINVAL;
 394
 395         /*
 396          * Get the destination switch number from the second field of its 'reg'
 397          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 398          */
 399         link_sw_addr = be32_to_cpup(reg + 1);
 400
 401         if (link_sw_addr >= pd->nr_chips)
 402                 return -EINVAL;
 403
 404         cd->rtable[link_sw_addr] = port_index;
 405
 406         return 0;
 407 }
 408
 409 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 410                               struct dsa_chip_data *cd,
 411                               int chip_index, int port_index,
 412                               struct device_node *port,
 413                               const char *port_name)
 414 {
 415         struct device_node *link;
 416         int link_index;
 417         int ret;
 418
 419         for (link_index = 0;; link_index++) {
 420                 link = of_parse_phandle(port, "link", link_index);
 421                 if (!link)
 422                         break;
 423
 424                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 425                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 426                                                          port_index, link);
 427                         if (ret)
 428                                 return ret;
 429                 }
 430         }
 431         return 0;
 432 }
 433
 434 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 435 {
 436         int i;
 437         int port_index;
 438
 439         for (i = 0; i < pd->nr_chips; i++) {
 440                 port_index = 0;
 441                 while (port_index < DSA_MAX_PORTS) {
 442                         kfree(pd->chip[i].port_names[port_index]);
 443                         port_index++;
 444                 }
 445
 446                 /* Drop our reference to the MDIO bus device */
 447                 if (pd->chip[i].host_dev)
 448                         put_device(pd->chip[i].host_dev);
 449         }
 450         kfree(pd->chip);
 451 }
 452
 453 static int dsa_of_probe(struct device *dev)
 454 {
 455         struct device_node *np = dev->of_node;
 456         struct device_node *child, *mdio, *ethernet, *port;
 457         struct mii_bus *mdio_bus, *mdio_bus_switch;
 458         struct net_device *ethernet_dev;
 459         struct dsa_platform_data *pd;
 460         struct dsa_chip_data *cd;
 461         const char *port_name;
 462         int chip_index, port_index;
 463         const unsigned int *sw_addr, *port_reg;
 464         u32 eeprom_len;
 465         int ret;
 466
 467         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 468         if (!mdio)
 469                 return -EINVAL;
 470
 471         mdio_bus = of_mdio_find_bus(mdio);
 472         if (!mdio_bus)
 473                 return -EPROBE_DEFER;
 474
 475         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 476         if (!ethernet) {
 477                 ret = -EINVAL;
 478                 goto out_put_mdio;
 479         }
 480
 481         ethernet_dev = of_find_net_device_by_node(ethernet);
 482         if (!ethernet_dev) {
 483                 ret = -EPROBE_DEFER;
 484                 goto out_put_mdio;
 485         }
 486
 487         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 488         if (!pd) {
 489                 ret = -ENOMEM;
 490                 goto out_put_ethernet;
 491         }
 492
 493         dev->platform_data = pd;
 494         pd->of_netdev = ethernet_dev;
 495         pd->nr_chips = of_get_available_child_count(np);
 496         if (pd->nr_chips > DSA_MAX_SWITCHES)
 497                 pd->nr_chips = DSA_MAX_SWITCHES;
 498
 499         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 500                            GFP_KERNEL);
 501         if (!pd->chip) {
 502                 ret = -ENOMEM;
 503                 goto out_free;
 504         }
 505
 506         chip_index = -1;
 507         for_each_available_child_of_node(np, child) {
 508                 int i;
 509
 510                 chip_index++;
 511                 cd = &pd->chip[chip_index];
 512
 513                 cd->of_node = child;
 514
 515                 /* Initialize the routing table */
 516                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
 517                         cd->rtable[i] = DSA_RTABLE_NONE;
 518
 519                 /* When assigning the host device, increment its refcount */
 520                 cd->host_dev = get_device(&mdio_bus->dev);
 521
 522                 sw_addr = of_get_property(child, "reg", NULL);
 523                 if (!sw_addr)
 524                         continue;
 525
 526                 cd->sw_addr = be32_to_cpup(sw_addr);
 527                 if (cd->sw_addr >= PHY_MAX_ADDR)
 528                         continue;
 529
 530                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 531                         cd->eeprom_len = eeprom_len;
 532
 533                 mdio = of_parse_phandle(child, "mii-bus", 0);
 534                 if (mdio) {
 535                         mdio_bus_switch = of_mdio_find_bus(mdio);
 536                         if (!mdio_bus_switch) {
 537                                 ret = -EPROBE_DEFER;
 538                                 goto out_free_chip;
 539                         }
 540
 541                         /* Drop the mdio_bus device ref, replacing the host
 542                          * device with the mdio_bus_switch device, keeping
 543                          * the refcount from of_mdio_find_bus() above.
 544                          */
 545                         put_device(cd->host_dev);
 546                         cd->host_dev = &mdio_bus_switch->dev;
 547                 }
 548
 549                 for_each_available_child_of_node(child, port) {
 550                         port_reg = of_get_property(port, "reg", NULL);
 551                         if (!port_reg)
 552                                 continue;
 553
 554                         port_index = be32_to_cpup(port_reg);
 555                         if (port_index >= DSA_MAX_PORTS)
 556                                 break;
 557
 558                         port_name = of_get_property(port, "label", NULL);
 559                         if (!port_name)
 560                                 continue;
 561
 562                         cd->port_dn[port_index] = port;
 563
 564                         cd->port_names[port_index] = kstrdup(port_name,
 565                                         GFP_KERNEL);
 566                         if (!cd->port_names[port_index]) {
 567                                 ret = -ENOMEM;
 568                                 goto out_free_chip;
 569                         }
 570
 571                         ret = dsa_of_probe_links(pd, cd, chip_index,
 572                                                  port_index, port, port_name);
 573                         if (ret)
 574                                 goto out_free_chip;
 575
 576                 }
 577         }
 578
 579         /* The individual chips hold their own refcount on the mdio bus,
 580          * so drop ours */
 581         put_device(&mdio_bus->dev);
 582
 583         return 0;
 584
 585 out_free_chip:
 586         dsa_of_free_platform_data(pd);
 587 out_free:
 588         kfree(pd);
 589         dev->platform_data = NULL;
 590 out_put_ethernet:
 591         put_device(&ethernet_dev->dev);
 592 out_put_mdio:
 593         put_device(&mdio_bus->dev);
 594         return ret;
 595 }
 596
 597 static void dsa_of_remove(struct device *dev)
 598 {
 599         struct dsa_platform_data *pd = dev->platform_data;
 600
 601         if (!dev->of_node)
 602                 return;
 603
 604         dsa_of_free_platform_data(pd);
 605         put_device(&pd->of_netdev->dev);
 606         kfree(pd);
 607 }
 608 #else
 609 static inline int dsa_of_probe(struct device *dev)
 610 {
 611         return 0;
 612 }
 613
 614 static inline void dsa_of_remove(struct device *dev)
 615 {
 616 }
 617 #endif
 618
 619 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 620                          struct device *parent, struct dsa_platform_data *pd)
 621 {
 622         int i;
 623         unsigned configured = 0;
 624
 625         dst->pd = pd;
 626         dst->master_netdev = dev;
 627         dst->cpu_port = -1;
 628
 629         for (i = 0; i < pd->nr_chips; i++) {
 630                 struct dsa_switch *ds;
 631
 632                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 633                 if (IS_ERR(ds)) {
 634                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 635                                    i, PTR_ERR(ds));
 636                         continue;
 637                 }
 638
 639                 dst->ds[i] = ds;
 640
 641                 ++configured;
 642         }
 643
 644         /*
 645          * If no switch was found, exit cleanly
 646          */
 647         if (!configured)
 648                 return -EPROBE_DEFER;
 649
 650         /*
 651          * If we use a tagging format that doesn't have an ethertype
 652          * field, make sure that all packets from this point on get
 653          * sent to the tag format's receive function.
 654          */
 655         wmb();
 656         dev->dsa_ptr = (void *)dst;
 657
 658         return 0;
 659 }
 660
 661 static int dsa_probe(struct platform_device *pdev)
 662 {
 663         struct dsa_platform_data *pd = pdev->dev.platform_data;
 664         struct net_device *dev;
 665         struct dsa_switch_tree *dst;
 666         int ret;
 667
 668         if (pdev->dev.of_node) {
 669                 ret = dsa_of_probe(&pdev->dev);
 670                 if (ret)
 671                         return ret;
 672
 673                 pd = pdev->dev.platform_data;
 674         }
 675
 676         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 677                 return -EINVAL;
 678
 679         if (pd->of_netdev) {
 680                 dev = pd->of_netdev;
 681                 dev_hold(dev);
 682         } else {
 683                 dev = dsa_dev_to_net_device(pd->netdev);
 684         }
 685         if (dev == NULL) {
 686                 ret = -EPROBE_DEFER;
 687                 goto out;
 688         }
 689
 690         if (dev->dsa_ptr != NULL) {
 691                 dev_put(dev);
 692                 ret = -EEXIST;
 693                 goto out;
 694         }
 695
 696         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 697         if (dst == NULL) {
 698                 dev_put(dev);
 699                 ret = -ENOMEM;
 700                 goto out;
 701         }
 702
 703         platform_set_drvdata(pdev, dst);
 704
 705         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 706         if (ret) {
 707                 dev_put(dev);
 708                 goto out;
 709         }
 710
 711         return 0;
 712
 713 out:
 714         dsa_of_remove(&pdev->dev);
 715
 716         return ret;
 717 }
 718
 719 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 720 {
 721         int i;
 722
 723         dst->master_netdev->dsa_ptr = NULL;
 724
 725         /* If we used a tagging format that doesn't have an ethertype
 726          * field, make sure that all packets from this point get sent
 727          * without the tag and go through the regular receive path.
 728          */
 729         wmb();
 730
 731         for (i = 0; i < dst->pd->nr_chips; i++) {
 732                 struct dsa_switch *ds = dst->ds[i];
 733
 734                 if (ds)
 735                         dsa_switch_destroy(ds);
 736         }
 737
 738         dsa_cpu_port_ethtool_restore(dst->cpu_switch);
 739
 740         dev_put(dst->master_netdev);
 741 }
 742
 743 static int dsa_remove(struct platform_device *pdev)
 744 {
 745         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 746
 747         dsa_remove_dst(dst);
 748         dsa_of_remove(&pdev->dev);
 749
 750         return 0;
 751 }
 752
 753 static void dsa_shutdown(struct platform_device *pdev)
 754 {
 755 }
 756
 757 #ifdef CONFIG_PM_SLEEP
 758 static int dsa_suspend(struct device *d)
 759 {
 760         struct platform_device *pdev = to_platform_device(d);
 761         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 762         int i, ret = 0;
 763
 764         for (i = 0; i < dst->pd->nr_chips; i++) {
 765                 struct dsa_switch *ds = dst->ds[i];
 766
 767                 if (ds != NULL)
 768                         ret = dsa_switch_suspend(ds);
 769         }
 770
 771         return ret;
 772 }
 773
 774 static int dsa_resume(struct device *d)
 775 {
 776         struct platform_device *pdev = to_platform_device(d);
 777         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 778         int i, ret = 0;
 779
 780         for (i = 0; i < dst->pd->nr_chips; i++) {
 781                 struct dsa_switch *ds = dst->ds[i];
 782
 783                 if (ds != NULL)
 784                         ret = dsa_switch_resume(ds);
 785         }
 786
 787         return ret;
 788 }
 789 #endif
 790
 791 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 792
 793 static const struct of_device_id dsa_of_match_table[] = {
 794         { .compatible = "marvell,dsa", },
 795         {}
 796 };
 797 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
 798
 799 static struct platform_driver dsa_driver = {
 800         .probe          = dsa_probe,
 801         .remove         = dsa_remove,
 802         .shutdown       = dsa_shutdown,
 803         .driver = {
 804                 .name   = "dsa",
 805                 .of_match_table = dsa_of_match_table,
 806                 .pm     = &dsa_pm_ops,
 807         },
 808 };
 809
 810 int dsa_legacy_register(void)
 811 {
 812         return platform_driver_register(&dsa_driver);
 813 }
 814
 815 void dsa_legacy_unregister(void)
 816 {
 817         platform_driver_unregister(&dsa_driver);
 818 }