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