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 /* platform driver init and cleanup *****************************************/
 293 static int dev_is_class(struct device *dev, void *class)
 294 {
 295         if (dev->class != NULL && !strcmp(dev->class->name, class))
 296                 return 1;
 297
 298         return 0;
 299 }
 300
 301 static struct device *dev_find_class(struct device *parent, char *class)
 302 {
 303         if (dev_is_class(parent, class)) {
 304                 get_device(parent);
 305                 return parent;
 306         }
 307
 308         return device_find_child(parent, class, dev_is_class);
 309 }
 310
 311 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 312 {
 313         struct device *d;
 314
 315         d = dev_find_class(dev, "mdio_bus");
 316         if (d != NULL) {
 317                 struct mii_bus *bus;
 318
 319                 bus = to_mii_bus(d);
 320                 put_device(d);
 321
 322                 return bus;
 323         }
 324
 325         return NULL;
 326 }
 327 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 328
 329 #ifdef CONFIG_OF
 330 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 331                                         struct dsa_chip_data *cd,
 332                                         int chip_index, int port_index,
 333                                         struct device_node *link)
 334 {
 335         const __be32 *reg;
 336         int link_sw_addr;
 337         struct device_node *parent_sw;
 338         int len;
 339
 340         parent_sw = of_get_parent(link);
 341         if (!parent_sw)
 342                 return -EINVAL;
 343
 344         reg = of_get_property(parent_sw, "reg", &len);
 345         if (!reg || (len != sizeof(*reg) * 2))
 346                 return -EINVAL;
 347
 348         /*
 349          * Get the destination switch number from the second field of its 'reg'
 350          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 351          */
 352         link_sw_addr = be32_to_cpup(reg + 1);
 353
 354         if (link_sw_addr >= pd->nr_chips)
 355                 return -EINVAL;
 356
 357         cd->rtable[link_sw_addr] = port_index;
 358
 359         return 0;
 360 }
 361
 362 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 363                               struct dsa_chip_data *cd,
 364                               int chip_index, int port_index,
 365                               struct device_node *port,
 366                               const char *port_name)
 367 {
 368         struct device_node *link;
 369         int link_index;
 370         int ret;
 371
 372         for (link_index = 0;; link_index++) {
 373                 link = of_parse_phandle(port, "link", link_index);
 374                 if (!link)
 375                         break;
 376
 377                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 378                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 379                                                          port_index, link);
 380                         if (ret)
 381                                 return ret;
 382                 }
 383         }
 384         return 0;
 385 }
 386
 387 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 388 {
 389         int i;
 390         int port_index;
 391
 392         for (i = 0; i < pd->nr_chips; i++) {
 393                 port_index = 0;
 394                 while (port_index < DSA_MAX_PORTS) {
 395                         kfree(pd->chip[i].port_names[port_index]);
 396                         port_index++;
 397                 }
 398
 399                 /* Drop our reference to the MDIO bus device */
 400                 if (pd->chip[i].host_dev)
 401                         put_device(pd->chip[i].host_dev);
 402         }
 403         kfree(pd->chip);
 404 }
 405
 406 static int dsa_of_probe(struct device *dev)
 407 {
 408         struct device_node *np = dev->of_node;
 409         struct device_node *child, *mdio, *ethernet, *port;
 410         struct mii_bus *mdio_bus, *mdio_bus_switch;
 411         struct net_device *ethernet_dev;
 412         struct dsa_platform_data *pd;
 413         struct dsa_chip_data *cd;
 414         const char *port_name;
 415         int chip_index, port_index;
 416         const unsigned int *sw_addr, *port_reg;
 417         u32 eeprom_len;
 418         int ret;
 419
 420         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 421         if (!mdio)
 422                 return -EINVAL;
 423
 424         mdio_bus = of_mdio_find_bus(mdio);
 425         if (!mdio_bus)
 426                 return -EPROBE_DEFER;
 427
 428         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 429         if (!ethernet) {
 430                 ret = -EINVAL;
 431                 goto out_put_mdio;
 432         }
 433
 434         ethernet_dev = of_find_net_device_by_node(ethernet);
 435         if (!ethernet_dev) {
 436                 ret = -EPROBE_DEFER;
 437                 goto out_put_mdio;
 438         }
 439
 440         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 441         if (!pd) {
 442                 ret = -ENOMEM;
 443                 goto out_put_ethernet;
 444         }
 445
 446         dev->platform_data = pd;
 447         pd->of_netdev = ethernet_dev;
 448         pd->nr_chips = of_get_available_child_count(np);
 449         if (pd->nr_chips > DSA_MAX_SWITCHES)
 450                 pd->nr_chips = DSA_MAX_SWITCHES;
 451
 452         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 453                            GFP_KERNEL);
 454         if (!pd->chip) {
 455                 ret = -ENOMEM;
 456                 goto out_free;
 457         }
 458
 459         chip_index = -1;
 460         for_each_available_child_of_node(np, child) {
 461                 int i;
 462
 463                 chip_index++;
 464                 cd = &pd->chip[chip_index];
 465
 466                 cd->of_node = child;
 467
 468                 /* Initialize the routing table */
 469                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
 470                         cd->rtable[i] = DSA_RTABLE_NONE;
 471
 472                 /* When assigning the host device, increment its refcount */
 473                 cd->host_dev = get_device(&mdio_bus->dev);
 474
 475                 sw_addr = of_get_property(child, "reg", NULL);
 476                 if (!sw_addr)
 477                         continue;
 478
 479                 cd->sw_addr = be32_to_cpup(sw_addr);
 480                 if (cd->sw_addr >= PHY_MAX_ADDR)
 481                         continue;
 482
 483                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 484                         cd->eeprom_len = eeprom_len;
 485
 486                 mdio = of_parse_phandle(child, "mii-bus", 0);
 487                 if (mdio) {
 488                         mdio_bus_switch = of_mdio_find_bus(mdio);
 489                         if (!mdio_bus_switch) {
 490                                 ret = -EPROBE_DEFER;
 491                                 goto out_free_chip;
 492                         }
 493
 494                         /* Drop the mdio_bus device ref, replacing the host
 495                          * device with the mdio_bus_switch device, keeping
 496                          * the refcount from of_mdio_find_bus() above.
 497                          */
 498                         put_device(cd->host_dev);
 499                         cd->host_dev = &mdio_bus_switch->dev;
 500                 }
 501
 502                 for_each_available_child_of_node(child, port) {
 503                         port_reg = of_get_property(port, "reg", NULL);
 504                         if (!port_reg)
 505                                 continue;
 506
 507                         port_index = be32_to_cpup(port_reg);
 508                         if (port_index >= DSA_MAX_PORTS)
 509                                 break;
 510
 511                         port_name = of_get_property(port, "label", NULL);
 512                         if (!port_name)
 513                                 continue;
 514
 515                         cd->port_dn[port_index] = port;
 516
 517                         cd->port_names[port_index] = kstrdup(port_name,
 518                                         GFP_KERNEL);
 519                         if (!cd->port_names[port_index]) {
 520                                 ret = -ENOMEM;
 521                                 goto out_free_chip;
 522                         }
 523
 524                         ret = dsa_of_probe_links(pd, cd, chip_index,
 525                                                  port_index, port, port_name);
 526                         if (ret)
 527                                 goto out_free_chip;
 528
 529                 }
 530         }
 531
 532         /* The individual chips hold their own refcount on the mdio bus,
 533          * so drop ours */
 534         put_device(&mdio_bus->dev);
 535
 536         return 0;
 537
 538 out_free_chip:
 539         dsa_of_free_platform_data(pd);
 540 out_free:
 541         kfree(pd);
 542         dev->platform_data = NULL;
 543 out_put_ethernet:
 544         put_device(&ethernet_dev->dev);
 545 out_put_mdio:
 546         put_device(&mdio_bus->dev);
 547         return ret;
 548 }
 549
 550 static void dsa_of_remove(struct device *dev)
 551 {
 552         struct dsa_platform_data *pd = dev->platform_data;
 553
 554         if (!dev->of_node)
 555                 return;
 556
 557         dsa_of_free_platform_data(pd);
 558         put_device(&pd->of_netdev->dev);
 559         kfree(pd);
 560 }
 561 #else
 562 static inline int dsa_of_probe(struct device *dev)
 563 {
 564         return 0;
 565 }
 566
 567 static inline void dsa_of_remove(struct device *dev)
 568 {
 569 }
 570 #endif
 571
 572 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 573                          struct device *parent, struct dsa_platform_data *pd)
 574 {
 575         int i;
 576         unsigned configured = 0;
 577
 578         dst->pd = pd;
 579         dst->master_netdev = dev;
 580         dst->cpu_port = -1;
 581
 582         for (i = 0; i < pd->nr_chips; i++) {
 583                 struct dsa_switch *ds;
 584
 585                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 586                 if (IS_ERR(ds)) {
 587                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 588                                    i, PTR_ERR(ds));
 589                         continue;
 590                 }
 591
 592                 dst->ds[i] = ds;
 593
 594                 ++configured;
 595         }
 596
 597         /*
 598          * If no switch was found, exit cleanly
 599          */
 600         if (!configured)
 601                 return -EPROBE_DEFER;
 602
 603         /*
 604          * If we use a tagging format that doesn't have an ethertype
 605          * field, make sure that all packets from this point on get
 606          * sent to the tag format's receive function.
 607          */
 608         wmb();
 609         dev->dsa_ptr = (void *)dst;
 610
 611         return 0;
 612 }
 613
 614 static int dsa_probe(struct platform_device *pdev)
 615 {
 616         struct dsa_platform_data *pd = pdev->dev.platform_data;
 617         struct net_device *dev;
 618         struct dsa_switch_tree *dst;
 619         int ret;
 620
 621         if (pdev->dev.of_node) {
 622                 ret = dsa_of_probe(&pdev->dev);
 623                 if (ret)
 624                         return ret;
 625
 626                 pd = pdev->dev.platform_data;
 627         }
 628
 629         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 630                 return -EINVAL;
 631
 632         if (pd->of_netdev) {
 633                 dev = pd->of_netdev;
 634                 dev_hold(dev);
 635         } else {
 636                 dev = dsa_dev_to_net_device(pd->netdev);
 637         }
 638         if (dev == NULL) {
 639                 ret = -EPROBE_DEFER;
 640                 goto out;
 641         }
 642
 643         if (dev->dsa_ptr != NULL) {
 644                 dev_put(dev);
 645                 ret = -EEXIST;
 646                 goto out;
 647         }
 648
 649         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 650         if (dst == NULL) {
 651                 dev_put(dev);
 652                 ret = -ENOMEM;
 653                 goto out;
 654         }
 655
 656         platform_set_drvdata(pdev, dst);
 657
 658         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 659         if (ret) {
 660                 dev_put(dev);
 661                 goto out;
 662         }
 663
 664         return 0;
 665
 666 out:
 667         dsa_of_remove(&pdev->dev);
 668
 669         return ret;
 670 }
 671
 672 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 673 {
 674         int i;
 675
 676         dst->master_netdev->dsa_ptr = NULL;
 677
 678         /* If we used a tagging format that doesn't have an ethertype
 679          * field, make sure that all packets from this point get sent
 680          * without the tag and go through the regular receive path.
 681          */
 682         wmb();
 683
 684         for (i = 0; i < dst->pd->nr_chips; i++) {
 685                 struct dsa_switch *ds = dst->ds[i];
 686
 687                 if (ds)
 688                         dsa_switch_destroy(ds);
 689         }
 690
 691         dsa_cpu_port_ethtool_restore(dst->cpu_switch);
 692
 693         dev_put(dst->master_netdev);
 694 }
 695
 696 static int dsa_remove(struct platform_device *pdev)
 697 {
 698         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 699
 700         dsa_remove_dst(dst);
 701         dsa_of_remove(&pdev->dev);
 702
 703         return 0;
 704 }
 705
 706 static void dsa_shutdown(struct platform_device *pdev)
 707 {
 708 }
 709
 710 #ifdef CONFIG_PM_SLEEP
 711 static int dsa_suspend(struct device *d)
 712 {
 713         struct platform_device *pdev = to_platform_device(d);
 714         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 715         int i, ret = 0;
 716
 717         for (i = 0; i < dst->pd->nr_chips; i++) {
 718                 struct dsa_switch *ds = dst->ds[i];
 719
 720                 if (ds != NULL)
 721                         ret = dsa_switch_suspend(ds);
 722         }
 723
 724         return ret;
 725 }
 726
 727 static int dsa_resume(struct device *d)
 728 {
 729         struct platform_device *pdev = to_platform_device(d);
 730         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 731         int i, ret = 0;
 732
 733         for (i = 0; i < dst->pd->nr_chips; i++) {
 734                 struct dsa_switch *ds = dst->ds[i];
 735
 736                 if (ds != NULL)
 737                         ret = dsa_switch_resume(ds);
 738         }
 739
 740         return ret;
 741 }
 742 #endif
 743
 744 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 745
 746 static const struct of_device_id dsa_of_match_table[] = {
 747         { .compatible = "marvell,dsa", },
 748         {}
 749 };
 750 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
 751
 752 static struct platform_driver dsa_driver = {
 753         .probe          = dsa_probe,
 754         .remove         = dsa_remove,
 755         .shutdown       = dsa_shutdown,
 756         .driver = {
 757                 .name   = "dsa",
 758                 .of_match_table = dsa_of_match_table,
 759                 .pm     = &dsa_pm_ops,
 760         },
 761 };
 762
 763 int dsa_legacy_register(void)
 764 {
 765         return platform_driver_register(&dsa_driver);
 766 }
 767
 768 void dsa_legacy_unregister(void)
 769 {
 770         platform_driver_unregister(&dsa_driver);
 771 }