net/dsa/dsa.c

   1 /*
   2  * net/dsa/dsa.c - Hardware switch handling
   3  * Copyright (c) 2008-2009 Marvell Semiconductor
   4  * Copyright (c) 2013 Florian Fainelli <[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 <net/dsa.h>
  18 #include <linux/of.h>
  19 #include <linux/of_mdio.h>
  20 #include <linux/of_platform.h>
  21 #include <linux/of_net.h>
  22 #include <linux/of_gpio.h>
  23 #include <linux/sysfs.h>
  24 #include <linux/phy_fixed.h>
  25 #include <linux/gpio/consumer.h>
  26 #include "dsa_priv.h"
  27
  28 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
  29                                             struct net_device *dev)
  30 {
  31         /* Just return the original SKB */
  32         return skb;
  33 }
  34
  35 static const struct dsa_device_ops none_ops = {
  36         .xmit   = dsa_slave_notag_xmit,
  37         .rcv    = NULL,
  38 };
  39
  40 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
  41 #ifdef CONFIG_NET_DSA_TAG_DSA
  42         [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
  43 #endif
  44 #ifdef CONFIG_NET_DSA_TAG_EDSA
  45         [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
  46 #endif
  47 #ifdef CONFIG_NET_DSA_TAG_TRAILER
  48         [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
  49 #endif
  50 #ifdef CONFIG_NET_DSA_TAG_BRCM
  51         [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
  52 #endif
  53 #ifdef CONFIG_NET_DSA_TAG_QCA
  54         [DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
  55 #endif
  56         [DSA_TAG_PROTO_NONE] = &none_ops,
  57 };
  58
  59 /* switch driver registration ***********************************************/
  60 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  61 static LIST_HEAD(dsa_switch_drivers);
  62
  63 void register_switch_driver(struct dsa_switch_driver *drv)
  64 {
  65         mutex_lock(&dsa_switch_drivers_mutex);
  66         list_add_tail(&drv->list, &dsa_switch_drivers);
  67         mutex_unlock(&dsa_switch_drivers_mutex);
  68 }
  69 EXPORT_SYMBOL_GPL(register_switch_driver);
  70
  71 void unregister_switch_driver(struct dsa_switch_driver *drv)
  72 {
  73         mutex_lock(&dsa_switch_drivers_mutex);
  74         list_del_init(&drv->list);
  75         mutex_unlock(&dsa_switch_drivers_mutex);
  76 }
  77 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  78
  79 static const struct dsa_switch_ops *
  80 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
  81                  const char **_name, void **priv)
  82 {
  83         const struct dsa_switch_ops *ret;
  84         struct list_head *list;
  85         const char *name;
  86
  87         ret = NULL;
  88         name = NULL;
  89
  90         mutex_lock(&dsa_switch_drivers_mutex);
  91         list_for_each(list, &dsa_switch_drivers) {
  92                 const struct dsa_switch_ops *ops;
  93                 struct dsa_switch_driver *drv;
  94
  95                 drv = list_entry(list, struct dsa_switch_driver, list);
  96                 ops = drv->ops;
  97
  98                 name = ops->probe(parent, host_dev, sw_addr, priv);
  99                 if (name != NULL) {
 100                         ret = ops;
 101                         break;
 102                 }
 103         }
 104         mutex_unlock(&dsa_switch_drivers_mutex);
 105
 106         *_name = name;
 107
 108         return ret;
 109 }
 110
 111 /* basic switch operations **************************************************/
 112 int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
 113                       struct device_node *port_dn, int port)
 114 {
 115         struct phy_device *phydev;
 116         int ret, mode;
 117
 118         if (of_phy_is_fixed_link(port_dn)) {
 119                 ret = of_phy_register_fixed_link(port_dn);
 120                 if (ret) {
 121                         dev_err(dev, "failed to register fixed PHY\n");
 122                         return ret;
 123                 }
 124                 phydev = of_phy_find_device(port_dn);
 125
 126                 mode = of_get_phy_mode(port_dn);
 127                 if (mode < 0)
 128                         mode = PHY_INTERFACE_MODE_NA;
 129                 phydev->interface = mode;
 130
 131                 genphy_config_init(phydev);
 132                 genphy_read_status(phydev);
 133                 if (ds->ops->adjust_link)
 134                         ds->ops->adjust_link(ds, port, phydev);
 135
 136                 put_device(&phydev->mdio.dev);
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
 143 {
 144         struct device_node *port_dn;
 145         int ret, port;
 146
 147         for (port = 0; port < DSA_MAX_PORTS; port++) {
 148                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 149                         continue;
 150
 151                 port_dn = ds->ports[port].dn;
 152                 ret = dsa_cpu_dsa_setup(ds, dev, port_dn, port);
 153                 if (ret)
 154                         return ret;
 155         }
 156         return 0;
 157 }
 158
 159 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
 160 {
 161         const struct dsa_device_ops *ops;
 162
 163         if (tag_protocol >= DSA_TAG_LAST)
 164                 return ERR_PTR(-EINVAL);
 165         ops = dsa_device_ops[tag_protocol];
 166
 167         if (!ops)
 168                 return ERR_PTR(-ENOPROTOOPT);
 169
 170         return ops;
 171 }
 172
 173 int dsa_cpu_port_ethtool_setup(struct dsa_switch *ds)
 174 {
 175         struct net_device *master;
 176         struct ethtool_ops *cpu_ops;
 177
 178         master = ds->dst->master_netdev;
 179         if (ds->master_netdev)
 180                 master = ds->master_netdev;
 181
 182         cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
 183         if (!cpu_ops)
 184                 return -ENOMEM;
 185
 186         memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops,
 187                sizeof(struct ethtool_ops));
 188         ds->dst->master_orig_ethtool_ops = master->ethtool_ops;
 189         memcpy(cpu_ops, &ds->dst->master_ethtool_ops,
 190                sizeof(struct ethtool_ops));
 191         dsa_cpu_port_ethtool_init(cpu_ops);
 192         master->ethtool_ops = cpu_ops;
 193
 194         return 0;
 195 }
 196
 197 void dsa_cpu_port_ethtool_restore(struct dsa_switch *ds)
 198 {
 199         struct net_device *master;
 200
 201         master = ds->dst->master_netdev;
 202         if (ds->master_netdev)
 203                 master = ds->master_netdev;
 204
 205         master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
 206 }
 207
 208 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 209 {
 210         const struct dsa_switch_ops *ops = ds->ops;
 211         struct dsa_switch_tree *dst = ds->dst;
 212         struct dsa_chip_data *cd = ds->cd;
 213         bool valid_name_found = false;
 214         int index = ds->index;
 215         int i, ret;
 216
 217         /*
 218          * Validate supplied switch configuration.
 219          */
 220         for (i = 0; i < DSA_MAX_PORTS; i++) {
 221                 char *name;
 222
 223                 name = cd->port_names[i];
 224                 if (name == NULL)
 225                         continue;
 226
 227                 if (!strcmp(name, "cpu")) {
 228                         if (!dst->cpu_switch) {
 229                                 netdev_err(dst->master_netdev,
 230                                            "multiple cpu ports?!\n");
 231                                 return -EINVAL;
 232                         }
 233                         dst->cpu_switch = ds;
 234                         dst->cpu_port = i;
 235                         ds->cpu_port_mask |= 1 << i;
 236                 } else if (!strcmp(name, "dsa")) {
 237                         ds->dsa_port_mask |= 1 << i;
 238                 } else {
 239                         ds->enabled_port_mask |= 1 << i;
 240                 }
 241                 valid_name_found = true;
 242         }
 243
 244         if (!valid_name_found && i == DSA_MAX_PORTS)
 245                 return -EINVAL;
 246
 247         /* Make the built-in MII bus mask match the number of ports,
 248          * switch drivers can override this later
 249          */
 250         ds->phys_mii_mask = ds->enabled_port_mask;
 251
 252         /*
 253          * If the CPU connects to this switch, set the switch tree
 254          * tagging protocol to the preferred tagging format of this
 255          * switch.
 256          */
 257         if (dst->cpu_switch == ds) {
 258                 enum dsa_tag_protocol tag_protocol;
 259
 260                 tag_protocol = ops->get_tag_protocol(ds);
 261                 dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
 262                 if (IS_ERR(dst->tag_ops))
 263                         return PTR_ERR(dst->tag_ops);
 264
 265                 dst->rcv = dst->tag_ops->rcv;
 266         }
 267
 268         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 269
 270         /*
 271          * Do basic register setup.
 272          */
 273         ret = ops->setup(ds);
 274         if (ret < 0)
 275                 return ret;
 276
 277         if (ops->set_addr) {
 278                 ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
 279                 if (ret < 0)
 280                         return ret;
 281         }
 282
 283         if (!ds->slave_mii_bus && ops->phy_read) {
 284                 ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 285                 if (!ds->slave_mii_bus)
 286                         return -ENOMEM;
 287                 dsa_slave_mii_bus_init(ds);
 288
 289                 ret = mdiobus_register(ds->slave_mii_bus);
 290                 if (ret < 0)
 291                         return ret;
 292         }
 293
 294         /*
 295          * Create network devices for physical switch ports.
 296          */
 297         for (i = 0; i < DSA_MAX_PORTS; i++) {
 298                 ds->ports[i].dn = cd->port_dn[i];
 299
 300                 if (!(ds->enabled_port_mask & (1 << i)))
 301                         continue;
 302
 303                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 304                 if (ret < 0)
 305                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 306                                    index, i, cd->port_names[i], ret);
 307         }
 308
 309         /* Perform configuration of the CPU and DSA ports */
 310         ret = dsa_cpu_dsa_setups(ds, parent);
 311         if (ret < 0)
 312                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 313                            index);
 314
 315         ret = dsa_cpu_port_ethtool_setup(ds);
 316         if (ret)
 317                 return ret;
 318
 319         dsa_hwmon_register(ds);
 320
 321         return 0;
 322 }
 323
 324 static struct dsa_switch *
 325 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 326                  struct device *parent, struct device *host_dev)
 327 {
 328         struct dsa_chip_data *cd = dst->pd->chip + index;
 329         const struct dsa_switch_ops *ops;
 330         struct dsa_switch *ds;
 331         int ret;
 332         const char *name;
 333         void *priv;
 334
 335         /*
 336          * Probe for switch model.
 337          */
 338         ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 339         if (!ops) {
 340                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 341                            index);
 342                 return ERR_PTR(-EINVAL);
 343         }
 344         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 345                     index, name);
 346
 347
 348         /*
 349          * Allocate and initialise switch state.
 350          */
 351         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 352         if (ds == NULL)
 353                 return ERR_PTR(-ENOMEM);
 354
 355         ds->dst = dst;
 356         ds->index = index;
 357         ds->cd = cd;
 358         ds->ops = ops;
 359         ds->priv = priv;
 360         ds->dev = parent;
 361
 362         ret = dsa_switch_setup_one(ds, parent);
 363         if (ret)
 364                 return ERR_PTR(ret);
 365
 366         return ds;
 367 }
 368
 369 void dsa_cpu_dsa_destroy(struct device_node *port_dn)
 370 {
 371         if (of_phy_is_fixed_link(port_dn))
 372                 of_phy_deregister_fixed_link(port_dn);
 373 }
 374
 375 static void dsa_switch_destroy(struct dsa_switch *ds)
 376 {
 377         int port;
 378
 379         dsa_hwmon_unregister(ds);
 380
 381         /* Destroy network devices for physical switch ports. */
 382         for (port = 0; port < DSA_MAX_PORTS; port++) {
 383                 if (!(ds->enabled_port_mask & (1 << port)))
 384                         continue;
 385
 386                 if (!ds->ports[port].netdev)
 387                         continue;
 388
 389                 dsa_slave_destroy(ds->ports[port].netdev);
 390         }
 391
 392         /* Disable configuration of the CPU and DSA ports */
 393         for (port = 0; port < DSA_MAX_PORTS; port++) {
 394                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 395                         continue;
 396                 dsa_cpu_dsa_destroy(ds->ports[port].dn);
 397
 398                 /* Clearing a bit which is not set does no harm */
 399                 ds->cpu_port_mask |= ~(1 << port);
 400                 ds->dsa_port_mask |= ~(1 << port);
 401         }
 402
 403         if (ds->slave_mii_bus && ds->ops->phy_read)
 404                 mdiobus_unregister(ds->slave_mii_bus);
 405 }
 406
 407 #ifdef CONFIG_PM_SLEEP
 408 int dsa_switch_suspend(struct dsa_switch *ds)
 409 {
 410         int i, ret = 0;
 411
 412         /* Suspend slave network devices */
 413         for (i = 0; i < DSA_MAX_PORTS; i++) {
 414                 if (!dsa_is_port_initialized(ds, i))
 415                         continue;
 416
 417                 ret = dsa_slave_suspend(ds->ports[i].netdev);
 418                 if (ret)
 419                         return ret;
 420         }
 421
 422         if (ds->ops->suspend)
 423                 ret = ds->ops->suspend(ds);
 424
 425         return ret;
 426 }
 427 EXPORT_SYMBOL_GPL(dsa_switch_suspend);
 428
 429 int dsa_switch_resume(struct dsa_switch *ds)
 430 {
 431         int i, ret = 0;
 432
 433         if (ds->ops->resume)
 434                 ret = ds->ops->resume(ds);
 435
 436         if (ret)
 437                 return ret;
 438
 439         /* Resume slave network devices */
 440         for (i = 0; i < DSA_MAX_PORTS; i++) {
 441                 if (!dsa_is_port_initialized(ds, i))
 442                         continue;
 443
 444                 ret = dsa_slave_resume(ds->ports[i].netdev);
 445                 if (ret)
 446                         return ret;
 447         }
 448
 449         return 0;
 450 }
 451 EXPORT_SYMBOL_GPL(dsa_switch_resume);
 452 #endif
 453
 454 /* platform driver init and cleanup *****************************************/
 455 static int dev_is_class(struct device *dev, void *class)
 456 {
 457         if (dev->class != NULL && !strcmp(dev->class->name, class))
 458                 return 1;
 459
 460         return 0;
 461 }
 462
 463 static struct device *dev_find_class(struct device *parent, char *class)
 464 {
 465         if (dev_is_class(parent, class)) {
 466                 get_device(parent);
 467                 return parent;
 468         }
 469
 470         return device_find_child(parent, class, dev_is_class);
 471 }
 472
 473 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 474 {
 475         struct device *d;
 476
 477         d = dev_find_class(dev, "mdio_bus");
 478         if (d != NULL) {
 479                 struct mii_bus *bus;
 480
 481                 bus = to_mii_bus(d);
 482                 put_device(d);
 483
 484                 return bus;
 485         }
 486
 487         return NULL;
 488 }
 489 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 490
 491 static struct net_device *dev_to_net_device(struct device *dev)
 492 {
 493         struct device *d;
 494
 495         d = dev_find_class(dev, "net");
 496         if (d != NULL) {
 497                 struct net_device *nd;
 498
 499                 nd = to_net_dev(d);
 500                 dev_hold(nd);
 501                 put_device(d);
 502
 503                 return nd;
 504         }
 505
 506         return NULL;
 507 }
 508
 509 #ifdef CONFIG_OF
 510 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 511                                         struct dsa_chip_data *cd,
 512                                         int chip_index, int port_index,
 513                                         struct device_node *link)
 514 {
 515         const __be32 *reg;
 516         int link_sw_addr;
 517         struct device_node *parent_sw;
 518         int len;
 519
 520         parent_sw = of_get_parent(link);
 521         if (!parent_sw)
 522                 return -EINVAL;
 523
 524         reg = of_get_property(parent_sw, "reg", &len);
 525         if (!reg || (len != sizeof(*reg) * 2))
 526                 return -EINVAL;
 527
 528         /*
 529          * Get the destination switch number from the second field of its 'reg'
 530          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 531          */
 532         link_sw_addr = be32_to_cpup(reg + 1);
 533
 534         if (link_sw_addr >= pd->nr_chips)
 535                 return -EINVAL;
 536
 537         cd->rtable[link_sw_addr] = port_index;
 538
 539         return 0;
 540 }
 541
 542 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 543                               struct dsa_chip_data *cd,
 544                               int chip_index, int port_index,
 545                               struct device_node *port,
 546                               const char *port_name)
 547 {
 548         struct device_node *link;
 549         int link_index;
 550         int ret;
 551
 552         for (link_index = 0;; link_index++) {
 553                 link = of_parse_phandle(port, "link", link_index);
 554                 if (!link)
 555                         break;
 556
 557                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 558                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 559                                                          port_index, link);
 560                         if (ret)
 561                                 return ret;
 562                 }
 563         }
 564         return 0;
 565 }
 566
 567 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 568 {
 569         int i;
 570         int port_index;
 571
 572         for (i = 0; i < pd->nr_chips; i++) {
 573                 port_index = 0;
 574                 while (port_index < DSA_MAX_PORTS) {
 575                         kfree(pd->chip[i].port_names[port_index]);
 576                         port_index++;
 577                 }
 578
 579                 /* Drop our reference to the MDIO bus device */
 580                 if (pd->chip[i].host_dev)
 581                         put_device(pd->chip[i].host_dev);
 582         }
 583         kfree(pd->chip);
 584 }
 585
 586 static int dsa_of_probe(struct device *dev)
 587 {
 588         struct device_node *np = dev->of_node;
 589         struct device_node *child, *mdio, *ethernet, *port;
 590         struct mii_bus *mdio_bus, *mdio_bus_switch;
 591         struct net_device *ethernet_dev;
 592         struct dsa_platform_data *pd;
 593         struct dsa_chip_data *cd;
 594         const char *port_name;
 595         int chip_index, port_index;
 596         const unsigned int *sw_addr, *port_reg;
 597         u32 eeprom_len;
 598         int ret;
 599
 600         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 601         if (!mdio)
 602                 return -EINVAL;
 603
 604         mdio_bus = of_mdio_find_bus(mdio);
 605         if (!mdio_bus)
 606                 return -EPROBE_DEFER;
 607
 608         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 609         if (!ethernet) {
 610                 ret = -EINVAL;
 611                 goto out_put_mdio;
 612         }
 613
 614         ethernet_dev = of_find_net_device_by_node(ethernet);
 615         if (!ethernet_dev) {
 616                 ret = -EPROBE_DEFER;
 617                 goto out_put_mdio;
 618         }
 619
 620         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 621         if (!pd) {
 622                 ret = -ENOMEM;
 623                 goto out_put_ethernet;
 624         }
 625
 626         dev->platform_data = pd;
 627         pd->of_netdev = ethernet_dev;
 628         pd->nr_chips = of_get_available_child_count(np);
 629         if (pd->nr_chips > DSA_MAX_SWITCHES)
 630                 pd->nr_chips = DSA_MAX_SWITCHES;
 631
 632         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 633                            GFP_KERNEL);
 634         if (!pd->chip) {
 635                 ret = -ENOMEM;
 636                 goto out_free;
 637         }
 638
 639         chip_index = -1;
 640         for_each_available_child_of_node(np, child) {
 641                 int i;
 642
 643                 chip_index++;
 644                 cd = &pd->chip[chip_index];
 645
 646                 cd->of_node = child;
 647
 648                 /* Initialize the routing table */
 649                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
 650                         cd->rtable[i] = DSA_RTABLE_NONE;
 651
 652                 /* When assigning the host device, increment its refcount */
 653                 cd->host_dev = get_device(&mdio_bus->dev);
 654
 655                 sw_addr = of_get_property(child, "reg", NULL);
 656                 if (!sw_addr)
 657                         continue;
 658
 659                 cd->sw_addr = be32_to_cpup(sw_addr);
 660                 if (cd->sw_addr >= PHY_MAX_ADDR)
 661                         continue;
 662
 663                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 664                         cd->eeprom_len = eeprom_len;
 665
 666                 mdio = of_parse_phandle(child, "mii-bus", 0);
 667                 if (mdio) {
 668                         mdio_bus_switch = of_mdio_find_bus(mdio);
 669                         if (!mdio_bus_switch) {
 670                                 ret = -EPROBE_DEFER;
 671                                 goto out_free_chip;
 672                         }
 673
 674                         /* Drop the mdio_bus device ref, replacing the host
 675                          * device with the mdio_bus_switch device, keeping
 676                          * the refcount from of_mdio_find_bus() above.
 677                          */
 678                         put_device(cd->host_dev);
 679                         cd->host_dev = &mdio_bus_switch->dev;
 680                 }
 681
 682                 for_each_available_child_of_node(child, port) {
 683                         port_reg = of_get_property(port, "reg", NULL);
 684                         if (!port_reg)
 685                                 continue;
 686
 687                         port_index = be32_to_cpup(port_reg);
 688                         if (port_index >= DSA_MAX_PORTS)
 689                                 break;
 690
 691                         port_name = of_get_property(port, "label", NULL);
 692                         if (!port_name)
 693                                 continue;
 694
 695                         cd->port_dn[port_index] = port;
 696
 697                         cd->port_names[port_index] = kstrdup(port_name,
 698                                         GFP_KERNEL);
 699                         if (!cd->port_names[port_index]) {
 700                                 ret = -ENOMEM;
 701                                 goto out_free_chip;
 702                         }
 703
 704                         ret = dsa_of_probe_links(pd, cd, chip_index,
 705                                                  port_index, port, port_name);
 706                         if (ret)
 707                                 goto out_free_chip;
 708
 709                 }
 710         }
 711
 712         /* The individual chips hold their own refcount on the mdio bus,
 713          * so drop ours */
 714         put_device(&mdio_bus->dev);
 715
 716         return 0;
 717
 718 out_free_chip:
 719         dsa_of_free_platform_data(pd);
 720 out_free:
 721         kfree(pd);
 722         dev->platform_data = NULL;
 723 out_put_ethernet:
 724         put_device(&ethernet_dev->dev);
 725 out_put_mdio:
 726         put_device(&mdio_bus->dev);
 727         return ret;
 728 }
 729
 730 static void dsa_of_remove(struct device *dev)
 731 {
 732         struct dsa_platform_data *pd = dev->platform_data;
 733
 734         if (!dev->of_node)
 735                 return;
 736
 737         dsa_of_free_platform_data(pd);
 738         put_device(&pd->of_netdev->dev);
 739         kfree(pd);
 740 }
 741 #else
 742 static inline int dsa_of_probe(struct device *dev)
 743 {
 744         return 0;
 745 }
 746
 747 static inline void dsa_of_remove(struct device *dev)
 748 {
 749 }
 750 #endif
 751
 752 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 753                          struct device *parent, struct dsa_platform_data *pd)
 754 {
 755         int i;
 756         unsigned configured = 0;
 757
 758         dst->pd = pd;
 759         dst->master_netdev = dev;
 760         dst->cpu_port = -1;
 761
 762         for (i = 0; i < pd->nr_chips; i++) {
 763                 struct dsa_switch *ds;
 764
 765                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 766                 if (IS_ERR(ds)) {
 767                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 768                                    i, PTR_ERR(ds));
 769                         continue;
 770                 }
 771
 772                 dst->ds[i] = ds;
 773
 774                 ++configured;
 775         }
 776
 777         /*
 778          * If no switch was found, exit cleanly
 779          */
 780         if (!configured)
 781                 return -EPROBE_DEFER;
 782
 783         /*
 784          * If we use a tagging format that doesn't have an ethertype
 785          * field, make sure that all packets from this point on get
 786          * sent to the tag format's receive function.
 787          */
 788         wmb();
 789         dev->dsa_ptr = (void *)dst;
 790
 791         return 0;
 792 }
 793
 794 static int dsa_probe(struct platform_device *pdev)
 795 {
 796         struct dsa_platform_data *pd = pdev->dev.platform_data;
 797         struct net_device *dev;
 798         struct dsa_switch_tree *dst;
 799         int ret;
 800
 801         if (pdev->dev.of_node) {
 802                 ret = dsa_of_probe(&pdev->dev);
 803                 if (ret)
 804                         return ret;
 805
 806                 pd = pdev->dev.platform_data;
 807         }
 808
 809         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 810                 return -EINVAL;
 811
 812         if (pd->of_netdev) {
 813                 dev = pd->of_netdev;
 814                 dev_hold(dev);
 815         } else {
 816                 dev = dev_to_net_device(pd->netdev);
 817         }
 818         if (dev == NULL) {
 819                 ret = -EPROBE_DEFER;
 820                 goto out;
 821         }
 822
 823         if (dev->dsa_ptr != NULL) {
 824                 dev_put(dev);
 825                 ret = -EEXIST;
 826                 goto out;
 827         }
 828
 829         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 830         if (dst == NULL) {
 831                 dev_put(dev);
 832                 ret = -ENOMEM;
 833                 goto out;
 834         }
 835
 836         platform_set_drvdata(pdev, dst);
 837
 838         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 839         if (ret) {
 840                 dev_put(dev);
 841                 goto out;
 842         }
 843
 844         return 0;
 845
 846 out:
 847         dsa_of_remove(&pdev->dev);
 848
 849         return ret;
 850 }
 851
 852 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 853 {
 854         int i;
 855
 856         dst->master_netdev->dsa_ptr = NULL;
 857
 858         /* If we used a tagging format that doesn't have an ethertype
 859          * field, make sure that all packets from this point get sent
 860          * without the tag and go through the regular receive path.
 861          */
 862         wmb();
 863
 864         for (i = 0; i < dst->pd->nr_chips; i++) {
 865                 struct dsa_switch *ds = dst->ds[i];
 866
 867                 if (ds)
 868                         dsa_switch_destroy(ds);
 869         }
 870
 871         dsa_cpu_port_ethtool_restore(dst->cpu_switch);
 872
 873         dev_put(dst->master_netdev);
 874 }
 875
 876 static int dsa_remove(struct platform_device *pdev)
 877 {
 878         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 879
 880         dsa_remove_dst(dst);
 881         dsa_of_remove(&pdev->dev);
 882
 883         return 0;
 884 }
 885
 886 static void dsa_shutdown(struct platform_device *pdev)
 887 {
 888 }
 889
 890 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 891                           struct packet_type *pt, struct net_device *orig_dev)
 892 {
 893         struct dsa_switch_tree *dst = dev->dsa_ptr;
 894
 895         if (unlikely(dst == NULL)) {
 896                 kfree_skb(skb);
 897                 return 0;
 898         }
 899
 900         return dst->rcv(skb, dev, pt, orig_dev);
 901 }
 902
 903 static struct packet_type dsa_pack_type __read_mostly = {
 904         .type   = cpu_to_be16(ETH_P_XDSA),
 905         .func   = dsa_switch_rcv,
 906 };
 907
 908 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 909         .notifier_call  = dsa_slave_netdevice_event,
 910 };
 911
 912 #ifdef CONFIG_PM_SLEEP
 913 static int dsa_suspend(struct device *d)
 914 {
 915         struct platform_device *pdev = to_platform_device(d);
 916         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 917         int i, ret = 0;
 918
 919         for (i = 0; i < dst->pd->nr_chips; i++) {
 920                 struct dsa_switch *ds = dst->ds[i];
 921
 922                 if (ds != NULL)
 923                         ret = dsa_switch_suspend(ds);
 924         }
 925
 926         return ret;
 927 }
 928
 929 static int dsa_resume(struct device *d)
 930 {
 931         struct platform_device *pdev = to_platform_device(d);
 932         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 933         int i, ret = 0;
 934
 935         for (i = 0; i < dst->pd->nr_chips; i++) {
 936                 struct dsa_switch *ds = dst->ds[i];
 937
 938                 if (ds != NULL)
 939                         ret = dsa_switch_resume(ds);
 940         }
 941
 942         return ret;
 943 }
 944 #endif
 945
 946 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 947
 948 static const struct of_device_id dsa_of_match_table[] = {
 949         { .compatible = "marvell,dsa", },
 950         {}
 951 };
 952 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
 953
 954 static struct platform_driver dsa_driver = {
 955         .probe          = dsa_probe,
 956         .remove         = dsa_remove,
 957         .shutdown       = dsa_shutdown,
 958         .driver = {
 959                 .name   = "dsa",
 960                 .of_match_table = dsa_of_match_table,
 961                 .pm     = &dsa_pm_ops,
 962         },
 963 };
 964
 965 static int __init dsa_init_module(void)
 966 {
 967         int rc;
 968
 969         register_netdevice_notifier(&dsa_netdevice_nb);
 970
 971         rc = platform_driver_register(&dsa_driver);
 972         if (rc)
 973                 return rc;
 974
 975         dev_add_pack(&dsa_pack_type);
 976
 977         return 0;
 978 }
 979 module_init(dsa_init_module);
 980
 981 static void __exit dsa_cleanup_module(void)
 982 {
 983         unregister_netdevice_notifier(&dsa_netdevice_nb);
 984         dev_remove_pack(&dsa_pack_type);
 985         platform_driver_unregister(&dsa_driver);
 986 }
 987 module_exit(dsa_cleanup_module);
 988
 989 MODULE_AUTHOR("Lennert Buytenhek <[email protected]>");
 990 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
 991 MODULE_LICENSE("GPL");
 992 MODULE_ALIAS("platform:dsa");