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 <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/ctype.h>
  13 #include <linux/device.h>
  14 #include <linux/hwmon.h>
  15 #include <linux/list.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <net/dsa.h>
  20 #include <linux/of.h>
  21 #include <linux/of_mdio.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/of_net.h>
  24 #include <linux/of_gpio.h>
  25 #include <linux/sysfs.h>
  26 #include <linux/phy_fixed.h>
  27 #include <linux/gpio/consumer.h>
  28 #include "dsa_priv.h"
  29
  30 char dsa_driver_version[] = "0.1";
  31
  32 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
  33                                             struct net_device *dev)
  34 {
  35         /* Just return the original SKB */
  36         return skb;
  37 }
  38
  39 static const struct dsa_device_ops none_ops = {
  40         .xmit   = dsa_slave_notag_xmit,
  41         .rcv    = NULL,
  42 };
  43
  44 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
  45 #ifdef CONFIG_NET_DSA_TAG_DSA
  46         [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
  47 #endif
  48 #ifdef CONFIG_NET_DSA_TAG_EDSA
  49         [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
  50 #endif
  51 #ifdef CONFIG_NET_DSA_TAG_TRAILER
  52         [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
  53 #endif
  54 #ifdef CONFIG_NET_DSA_TAG_BRCM
  55         [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
  56 #endif
  57         [DSA_TAG_PROTO_NONE] = &none_ops,
  58 };
  59
  60 /* switch driver registration ***********************************************/
  61 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  62 static LIST_HEAD(dsa_switch_drivers);
  63
  64 void register_switch_driver(struct dsa_switch_driver *drv)
  65 {
  66         mutex_lock(&dsa_switch_drivers_mutex);
  67         list_add_tail(&drv->list, &dsa_switch_drivers);
  68         mutex_unlock(&dsa_switch_drivers_mutex);
  69 }
  70 EXPORT_SYMBOL_GPL(register_switch_driver);
  71
  72 void unregister_switch_driver(struct dsa_switch_driver *drv)
  73 {
  74         mutex_lock(&dsa_switch_drivers_mutex);
  75         list_del_init(&drv->list);
  76         mutex_unlock(&dsa_switch_drivers_mutex);
  77 }
  78 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  79
  80 static struct dsa_switch_driver *
  81 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
  82                  const char **_name, void **priv)
  83 {
  84         struct dsa_switch_driver *ret;
  85         struct list_head *list;
  86         const char *name;
  87
  88         ret = NULL;
  89         name = NULL;
  90
  91         mutex_lock(&dsa_switch_drivers_mutex);
  92         list_for_each(list, &dsa_switch_drivers) {
  93                 struct dsa_switch_driver *drv;
  94
  95                 drv = list_entry(list, struct dsa_switch_driver, list);
  96
  97                 name = drv->probe(parent, host_dev, sw_addr, priv);
  98                 if (name != NULL) {
  99                         ret = drv;
 100                         break;
 101                 }
 102         }
 103         mutex_unlock(&dsa_switch_drivers_mutex);
 104
 105         *_name = name;
 106
 107         return ret;
 108 }
 109
 110 /* hwmon support ************************************************************/
 111
 112 #ifdef CONFIG_NET_DSA_HWMON
 113
 114 static ssize_t temp1_input_show(struct device *dev,
 115                                 struct device_attribute *attr, char *buf)
 116 {
 117         struct dsa_switch *ds = dev_get_drvdata(dev);
 118         int temp, ret;
 119
 120         ret = ds->drv->get_temp(ds, &temp);
 121         if (ret < 0)
 122                 return ret;
 123
 124         return sprintf(buf, "%d\n", temp * 1000);
 125 }
 126 static DEVICE_ATTR_RO(temp1_input);
 127
 128 static ssize_t temp1_max_show(struct device *dev,
 129                               struct device_attribute *attr, char *buf)
 130 {
 131         struct dsa_switch *ds = dev_get_drvdata(dev);
 132         int temp, ret;
 133
 134         ret = ds->drv->get_temp_limit(ds, &temp);
 135         if (ret < 0)
 136                 return ret;
 137
 138         return sprintf(buf, "%d\n", temp * 1000);
 139 }
 140
 141 static ssize_t temp1_max_store(struct device *dev,
 142                                struct device_attribute *attr, const char *buf,
 143                                size_t count)
 144 {
 145         struct dsa_switch *ds = dev_get_drvdata(dev);
 146         int temp, ret;
 147
 148         ret = kstrtoint(buf, 0, &temp);
 149         if (ret < 0)
 150                 return ret;
 151
 152         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 153         if (ret < 0)
 154                 return ret;
 155
 156         return count;
 157 }
 158 static DEVICE_ATTR_RW(temp1_max);
 159
 160 static ssize_t temp1_max_alarm_show(struct device *dev,
 161                                     struct device_attribute *attr, char *buf)
 162 {
 163         struct dsa_switch *ds = dev_get_drvdata(dev);
 164         bool alarm;
 165         int ret;
 166
 167         ret = ds->drv->get_temp_alarm(ds, &alarm);
 168         if (ret < 0)
 169                 return ret;
 170
 171         return sprintf(buf, "%d\n", alarm);
 172 }
 173 static DEVICE_ATTR_RO(temp1_max_alarm);
 174
 175 static struct attribute *dsa_hwmon_attrs[] = {
 176         &dev_attr_temp1_input.attr,     /* 0 */
 177         &dev_attr_temp1_max.attr,       /* 1 */
 178         &dev_attr_temp1_max_alarm.attr, /* 2 */
 179         NULL
 180 };
 181
 182 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 183                                        struct attribute *attr, int index)
 184 {
 185         struct device *dev = container_of(kobj, struct device, kobj);
 186         struct dsa_switch *ds = dev_get_drvdata(dev);
 187         struct dsa_switch_driver *drv = ds->drv;
 188         umode_t mode = attr->mode;
 189
 190         if (index == 1) {
 191                 if (!drv->get_temp_limit)
 192                         mode = 0;
 193                 else if (!drv->set_temp_limit)
 194                         mode &= ~S_IWUSR;
 195         } else if (index == 2 && !drv->get_temp_alarm) {
 196                 mode = 0;
 197         }
 198         return mode;
 199 }
 200
 201 static const struct attribute_group dsa_hwmon_group = {
 202         .attrs = dsa_hwmon_attrs,
 203         .is_visible = dsa_hwmon_attrs_visible,
 204 };
 205 __ATTRIBUTE_GROUPS(dsa_hwmon);
 206
 207 #endif /* CONFIG_NET_DSA_HWMON */
 208
 209 /* basic switch operations **************************************************/
 210 int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
 211                       struct device_node *port_dn, int port)
 212 {
 213         struct phy_device *phydev;
 214         int ret, mode;
 215
 216         if (of_phy_is_fixed_link(port_dn)) {
 217                 ret = of_phy_register_fixed_link(port_dn);
 218                 if (ret) {
 219                         dev_err(dev, "failed to register fixed PHY\n");
 220                         return ret;
 221                 }
 222                 phydev = of_phy_find_device(port_dn);
 223
 224                 mode = of_get_phy_mode(port_dn);
 225                 if (mode < 0)
 226                         mode = PHY_INTERFACE_MODE_NA;
 227                 phydev->interface = mode;
 228
 229                 genphy_config_init(phydev);
 230                 genphy_read_status(phydev);
 231                 if (ds->drv->adjust_link)
 232                         ds->drv->adjust_link(ds, port, phydev);
 233         }
 234
 235         return 0;
 236 }
 237
 238 static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
 239 {
 240         struct device_node *port_dn;
 241         int ret, port;
 242
 243         for (port = 0; port < DSA_MAX_PORTS; port++) {
 244                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 245                         continue;
 246
 247                 port_dn = ds->ports[port].dn;
 248                 ret = dsa_cpu_dsa_setup(ds, dev, port_dn, port);
 249                 if (ret)
 250                         return ret;
 251         }
 252         return 0;
 253 }
 254
 255 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
 256 {
 257         const struct dsa_device_ops *ops;
 258
 259         if (tag_protocol >= DSA_TAG_LAST)
 260                 return ERR_PTR(-EINVAL);
 261         ops = dsa_device_ops[tag_protocol];
 262
 263         if (!ops)
 264                 return ERR_PTR(-ENOPROTOOPT);
 265
 266         return ops;
 267 }
 268
 269 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 270 {
 271         struct dsa_switch_driver *drv = ds->drv;
 272         struct dsa_switch_tree *dst = ds->dst;
 273         struct dsa_chip_data *cd = ds->cd;
 274         bool valid_name_found = false;
 275         int index = ds->index;
 276         int i, ret;
 277
 278         /*
 279          * Validate supplied switch configuration.
 280          */
 281         for (i = 0; i < DSA_MAX_PORTS; i++) {
 282                 char *name;
 283
 284                 name = cd->port_names[i];
 285                 if (name == NULL)
 286                         continue;
 287
 288                 if (!strcmp(name, "cpu")) {
 289                         if (dst->cpu_switch != -1) {
 290                                 netdev_err(dst->master_netdev,
 291                                            "multiple cpu ports?!\n");
 292                                 ret = -EINVAL;
 293                                 goto out;
 294                         }
 295                         dst->cpu_switch = index;
 296                         dst->cpu_port = i;
 297                 } else if (!strcmp(name, "dsa")) {
 298                         ds->dsa_port_mask |= 1 << i;
 299                 } else {
 300                         ds->enabled_port_mask |= 1 << i;
 301                 }
 302                 valid_name_found = true;
 303         }
 304
 305         if (!valid_name_found && i == DSA_MAX_PORTS) {
 306                 ret = -EINVAL;
 307                 goto out;
 308         }
 309
 310         /* Make the built-in MII bus mask match the number of ports,
 311          * switch drivers can override this later
 312          */
 313         ds->phys_mii_mask = ds->enabled_port_mask;
 314
 315         /*
 316          * If the CPU connects to this switch, set the switch tree
 317          * tagging protocol to the preferred tagging format of this
 318          * switch.
 319          */
 320         if (dst->cpu_switch == index) {
 321                 dst->tag_ops = dsa_resolve_tag_protocol(drv->tag_protocol);
 322                 if (IS_ERR(dst->tag_ops)) {
 323                         ret = PTR_ERR(dst->tag_ops);
 324                         goto out;
 325                 }
 326
 327                 dst->rcv = dst->tag_ops->rcv;
 328         }
 329
 330         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 331
 332         /*
 333          * Do basic register setup.
 334          */
 335         ret = drv->setup(ds);
 336         if (ret < 0)
 337                 goto out;
 338
 339         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 340         if (ret < 0)
 341                 goto out;
 342
 343         ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 344         if (ds->slave_mii_bus == NULL) {
 345                 ret = -ENOMEM;
 346                 goto out;
 347         }
 348         dsa_slave_mii_bus_init(ds);
 349
 350         ret = mdiobus_register(ds->slave_mii_bus);
 351         if (ret < 0)
 352                 goto out;
 353
 354
 355         /*
 356          * Create network devices for physical switch ports.
 357          */
 358         for (i = 0; i < DSA_MAX_PORTS; i++) {
 359                 ds->ports[i].dn = cd->port_dn[i];
 360
 361                 if (!(ds->enabled_port_mask & (1 << i)))
 362                         continue;
 363
 364                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 365                 if (ret < 0) {
 366                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 367                                    index, i, cd->port_names[i], ret);
 368                         ret = 0;
 369                 }
 370         }
 371
 372         /* Perform configuration of the CPU and DSA ports */
 373         ret = dsa_cpu_dsa_setups(ds, parent);
 374         if (ret < 0) {
 375                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 376                            index);
 377                 ret = 0;
 378         }
 379
 380 #ifdef CONFIG_NET_DSA_HWMON
 381         /* If the switch provides a temperature sensor,
 382          * register with hardware monitoring subsystem.
 383          * Treat registration error as non-fatal and ignore it.
 384          */
 385         if (drv->get_temp) {
 386                 const char *netname = netdev_name(dst->master_netdev);
 387                 char hname[IFNAMSIZ + 1];
 388                 int i, j;
 389
 390                 /* Create valid hwmon 'name' attribute */
 391                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 392                         if (isalnum(netname[i]))
 393                                 hname[j++] = netname[i];
 394                 }
 395                 hname[j] = '\0';
 396                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 397                           hname, index);
 398                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 399                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 400                 if (IS_ERR(ds->hwmon_dev))
 401                         ds->hwmon_dev = NULL;
 402         }
 403 #endif /* CONFIG_NET_DSA_HWMON */
 404
 405         return ret;
 406
 407 out:
 408         return ret;
 409 }
 410
 411 static struct dsa_switch *
 412 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 413                  struct device *parent, struct device *host_dev)
 414 {
 415         struct dsa_chip_data *cd = dst->pd->chip + index;
 416         struct dsa_switch_driver *drv;
 417         struct dsa_switch *ds;
 418         int ret;
 419         const char *name;
 420         void *priv;
 421
 422         /*
 423          * Probe for switch model.
 424          */
 425         drv = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 426         if (drv == NULL) {
 427                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 428                            index);
 429                 return ERR_PTR(-EINVAL);
 430         }
 431         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 432                     index, name);
 433
 434
 435         /*
 436          * Allocate and initialise switch state.
 437          */
 438         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 439         if (ds == NULL)
 440                 return ERR_PTR(-ENOMEM);
 441
 442         ds->dst = dst;
 443         ds->index = index;
 444         ds->cd = cd;
 445         ds->drv = drv;
 446         ds->priv = priv;
 447         ds->dev = parent;
 448
 449         ret = dsa_switch_setup_one(ds, parent);
 450         if (ret)
 451                 return ERR_PTR(ret);
 452
 453         return ds;
 454 }
 455
 456 void dsa_cpu_dsa_destroy(struct device_node *port_dn)
 457 {
 458         struct phy_device *phydev;
 459
 460         if (of_phy_is_fixed_link(port_dn)) {
 461                 phydev = of_phy_find_device(port_dn);
 462                 if (phydev) {
 463                         phy_device_free(phydev);
 464                         fixed_phy_unregister(phydev);
 465                 }
 466         }
 467 }
 468
 469 static void dsa_switch_destroy(struct dsa_switch *ds)
 470 {
 471         int port;
 472
 473 #ifdef CONFIG_NET_DSA_HWMON
 474         if (ds->hwmon_dev)
 475                 hwmon_device_unregister(ds->hwmon_dev);
 476 #endif
 477
 478         /* Destroy network devices for physical switch ports. */
 479         for (port = 0; port < DSA_MAX_PORTS; port++) {
 480                 if (!(ds->enabled_port_mask & (1 << port)))
 481                         continue;
 482
 483                 if (!ds->ports[port].netdev)
 484                         continue;
 485
 486                 dsa_slave_destroy(ds->ports[port].netdev);
 487         }
 488
 489         /* Disable configuration of the CPU and DSA ports */
 490         for (port = 0; port < DSA_MAX_PORTS; port++) {
 491                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 492                         continue;
 493                 dsa_cpu_dsa_destroy(ds->ports[port].dn);
 494         }
 495
 496         mdiobus_unregister(ds->slave_mii_bus);
 497 }
 498
 499 #ifdef CONFIG_PM_SLEEP
 500 static int dsa_switch_suspend(struct dsa_switch *ds)
 501 {
 502         int i, ret = 0;
 503
 504         /* Suspend slave network devices */
 505         for (i = 0; i < DSA_MAX_PORTS; i++) {
 506                 if (!dsa_is_port_initialized(ds, i))
 507                         continue;
 508
 509                 ret = dsa_slave_suspend(ds->ports[i].netdev);
 510                 if (ret)
 511                         return ret;
 512         }
 513
 514         if (ds->drv->suspend)
 515                 ret = ds->drv->suspend(ds);
 516
 517         return ret;
 518 }
 519
 520 static int dsa_switch_resume(struct dsa_switch *ds)
 521 {
 522         int i, ret = 0;
 523
 524         if (ds->drv->resume)
 525                 ret = ds->drv->resume(ds);
 526
 527         if (ret)
 528                 return ret;
 529
 530         /* Resume slave network devices */
 531         for (i = 0; i < DSA_MAX_PORTS; i++) {
 532                 if (!dsa_is_port_initialized(ds, i))
 533                         continue;
 534
 535                 ret = dsa_slave_resume(ds->ports[i].netdev);
 536                 if (ret)
 537                         return ret;
 538         }
 539
 540         return 0;
 541 }
 542 #endif
 543
 544 /* platform driver init and cleanup *****************************************/
 545 static int dev_is_class(struct device *dev, void *class)
 546 {
 547         if (dev->class != NULL && !strcmp(dev->class->name, class))
 548                 return 1;
 549
 550         return 0;
 551 }
 552
 553 static struct device *dev_find_class(struct device *parent, char *class)
 554 {
 555         if (dev_is_class(parent, class)) {
 556                 get_device(parent);
 557                 return parent;
 558         }
 559
 560         return device_find_child(parent, class, dev_is_class);
 561 }
 562
 563 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 564 {
 565         struct device *d;
 566
 567         d = dev_find_class(dev, "mdio_bus");
 568         if (d != NULL) {
 569                 struct mii_bus *bus;
 570
 571                 bus = to_mii_bus(d);
 572                 put_device(d);
 573
 574                 return bus;
 575         }
 576
 577         return NULL;
 578 }
 579 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 580
 581 static struct net_device *dev_to_net_device(struct device *dev)
 582 {
 583         struct device *d;
 584
 585         d = dev_find_class(dev, "net");
 586         if (d != NULL) {
 587                 struct net_device *nd;
 588
 589                 nd = to_net_dev(d);
 590                 dev_hold(nd);
 591                 put_device(d);
 592
 593                 return nd;
 594         }
 595
 596         return NULL;
 597 }
 598
 599 #ifdef CONFIG_OF
 600 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 601                                         struct dsa_chip_data *cd,
 602                                         int chip_index, int port_index,
 603                                         struct device_node *link)
 604 {
 605         const __be32 *reg;
 606         int link_sw_addr;
 607         struct device_node *parent_sw;
 608         int len;
 609
 610         parent_sw = of_get_parent(link);
 611         if (!parent_sw)
 612                 return -EINVAL;
 613
 614         reg = of_get_property(parent_sw, "reg", &len);
 615         if (!reg || (len != sizeof(*reg) * 2))
 616                 return -EINVAL;
 617
 618         /*
 619          * Get the destination switch number from the second field of its 'reg'
 620          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 621          */
 622         link_sw_addr = be32_to_cpup(reg + 1);
 623
 624         if (link_sw_addr >= pd->nr_chips)
 625                 return -EINVAL;
 626
 627         cd->rtable[link_sw_addr] = port_index;
 628
 629         return 0;
 630 }
 631
 632 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 633                               struct dsa_chip_data *cd,
 634                               int chip_index, int port_index,
 635                               struct device_node *port,
 636                               const char *port_name)
 637 {
 638         struct device_node *link;
 639         int link_index;
 640         int ret;
 641
 642         for (link_index = 0;; link_index++) {
 643                 link = of_parse_phandle(port, "link", link_index);
 644                 if (!link)
 645                         break;
 646
 647                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 648                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 649                                                          port_index, link);
 650                         if (ret)
 651                                 return ret;
 652                 }
 653         }
 654         return 0;
 655 }
 656
 657 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 658 {
 659         int i;
 660         int port_index;
 661
 662         for (i = 0; i < pd->nr_chips; i++) {
 663                 port_index = 0;
 664                 while (port_index < DSA_MAX_PORTS) {
 665                         kfree(pd->chip[i].port_names[port_index]);
 666                         port_index++;
 667                 }
 668
 669                 /* Drop our reference to the MDIO bus device */
 670                 if (pd->chip[i].host_dev)
 671                         put_device(pd->chip[i].host_dev);
 672         }
 673         kfree(pd->chip);
 674 }
 675
 676 static int dsa_of_probe(struct device *dev)
 677 {
 678         struct device_node *np = dev->of_node;
 679         struct device_node *child, *mdio, *ethernet, *port;
 680         struct mii_bus *mdio_bus, *mdio_bus_switch;
 681         struct net_device *ethernet_dev;
 682         struct dsa_platform_data *pd;
 683         struct dsa_chip_data *cd;
 684         const char *port_name;
 685         int chip_index, port_index;
 686         const unsigned int *sw_addr, *port_reg;
 687         u32 eeprom_len;
 688         int ret;
 689
 690         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 691         if (!mdio)
 692                 return -EINVAL;
 693
 694         mdio_bus = of_mdio_find_bus(mdio);
 695         if (!mdio_bus)
 696                 return -EPROBE_DEFER;
 697
 698         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 699         if (!ethernet) {
 700                 ret = -EINVAL;
 701                 goto out_put_mdio;
 702         }
 703
 704         ethernet_dev = of_find_net_device_by_node(ethernet);
 705         if (!ethernet_dev) {
 706                 ret = -EPROBE_DEFER;
 707                 goto out_put_mdio;
 708         }
 709
 710         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 711         if (!pd) {
 712                 ret = -ENOMEM;
 713                 goto out_put_ethernet;
 714         }
 715
 716         dev->platform_data = pd;
 717         pd->of_netdev = ethernet_dev;
 718         pd->nr_chips = of_get_available_child_count(np);
 719         if (pd->nr_chips > DSA_MAX_SWITCHES)
 720                 pd->nr_chips = DSA_MAX_SWITCHES;
 721
 722         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 723                            GFP_KERNEL);
 724         if (!pd->chip) {
 725                 ret = -ENOMEM;
 726                 goto out_free;
 727         }
 728
 729         chip_index = -1;
 730         for_each_available_child_of_node(np, child) {
 731                 chip_index++;
 732                 cd = &pd->chip[chip_index];
 733
 734                 cd->of_node = child;
 735
 736                 /* When assigning the host device, increment its refcount */
 737                 cd->host_dev = get_device(&mdio_bus->dev);
 738
 739                 sw_addr = of_get_property(child, "reg", NULL);
 740                 if (!sw_addr)
 741                         continue;
 742
 743                 cd->sw_addr = be32_to_cpup(sw_addr);
 744                 if (cd->sw_addr >= PHY_MAX_ADDR)
 745                         continue;
 746
 747                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 748                         cd->eeprom_len = eeprom_len;
 749
 750                 mdio = of_parse_phandle(child, "mii-bus", 0);
 751                 if (mdio) {
 752                         mdio_bus_switch = of_mdio_find_bus(mdio);
 753                         if (!mdio_bus_switch) {
 754                                 ret = -EPROBE_DEFER;
 755                                 goto out_free_chip;
 756                         }
 757
 758                         /* Drop the mdio_bus device ref, replacing the host
 759                          * device with the mdio_bus_switch device, keeping
 760                          * the refcount from of_mdio_find_bus() above.
 761                          */
 762                         put_device(cd->host_dev);
 763                         cd->host_dev = &mdio_bus_switch->dev;
 764                 }
 765
 766                 for_each_available_child_of_node(child, port) {
 767                         port_reg = of_get_property(port, "reg", NULL);
 768                         if (!port_reg)
 769                                 continue;
 770
 771                         port_index = be32_to_cpup(port_reg);
 772                         if (port_index >= DSA_MAX_PORTS)
 773                                 break;
 774
 775                         port_name = of_get_property(port, "label", NULL);
 776                         if (!port_name)
 777                                 continue;
 778
 779                         cd->port_dn[port_index] = port;
 780
 781                         cd->port_names[port_index] = kstrdup(port_name,
 782                                         GFP_KERNEL);
 783                         if (!cd->port_names[port_index]) {
 784                                 ret = -ENOMEM;
 785                                 goto out_free_chip;
 786                         }
 787
 788                         ret = dsa_of_probe_links(pd, cd, chip_index,
 789                                                  port_index, port, port_name);
 790                         if (ret)
 791                                 goto out_free_chip;
 792
 793                 }
 794         }
 795
 796         /* The individual chips hold their own refcount on the mdio bus,
 797          * so drop ours */
 798         put_device(&mdio_bus->dev);
 799
 800         return 0;
 801
 802 out_free_chip:
 803         dsa_of_free_platform_data(pd);
 804 out_free:
 805         kfree(pd);
 806         dev->platform_data = NULL;
 807 out_put_ethernet:
 808         put_device(&ethernet_dev->dev);
 809 out_put_mdio:
 810         put_device(&mdio_bus->dev);
 811         return ret;
 812 }
 813
 814 static void dsa_of_remove(struct device *dev)
 815 {
 816         struct dsa_platform_data *pd = dev->platform_data;
 817
 818         if (!dev->of_node)
 819                 return;
 820
 821         dsa_of_free_platform_data(pd);
 822         put_device(&pd->of_netdev->dev);
 823         kfree(pd);
 824 }
 825 #else
 826 static inline int dsa_of_probe(struct device *dev)
 827 {
 828         return 0;
 829 }
 830
 831 static inline void dsa_of_remove(struct device *dev)
 832 {
 833 }
 834 #endif
 835
 836 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 837                          struct device *parent, struct dsa_platform_data *pd)
 838 {
 839         int i;
 840         unsigned configured = 0;
 841
 842         dst->pd = pd;
 843         dst->master_netdev = dev;
 844         dst->cpu_switch = -1;
 845         dst->cpu_port = -1;
 846
 847         for (i = 0; i < pd->nr_chips; i++) {
 848                 struct dsa_switch *ds;
 849
 850                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 851                 if (IS_ERR(ds)) {
 852                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 853                                    i, PTR_ERR(ds));
 854                         continue;
 855                 }
 856
 857                 dst->ds[i] = ds;
 858
 859                 ++configured;
 860         }
 861
 862         /*
 863          * If no switch was found, exit cleanly
 864          */
 865         if (!configured)
 866                 return -EPROBE_DEFER;
 867
 868         /*
 869          * If we use a tagging format that doesn't have an ethertype
 870          * field, make sure that all packets from this point on get
 871          * sent to the tag format's receive function.
 872          */
 873         wmb();
 874         dev->dsa_ptr = (void *)dst;
 875
 876         return 0;
 877 }
 878
 879 static int dsa_probe(struct platform_device *pdev)
 880 {
 881         struct dsa_platform_data *pd = pdev->dev.platform_data;
 882         struct net_device *dev;
 883         struct dsa_switch_tree *dst;
 884         int ret;
 885
 886         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 887                        dsa_driver_version);
 888
 889         if (pdev->dev.of_node) {
 890                 ret = dsa_of_probe(&pdev->dev);
 891                 if (ret)
 892                         return ret;
 893
 894                 pd = pdev->dev.platform_data;
 895         }
 896
 897         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 898                 return -EINVAL;
 899
 900         if (pd->of_netdev) {
 901                 dev = pd->of_netdev;
 902                 dev_hold(dev);
 903         } else {
 904                 dev = dev_to_net_device(pd->netdev);
 905         }
 906         if (dev == NULL) {
 907                 ret = -EPROBE_DEFER;
 908                 goto out;
 909         }
 910
 911         if (dev->dsa_ptr != NULL) {
 912                 dev_put(dev);
 913                 ret = -EEXIST;
 914                 goto out;
 915         }
 916
 917         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 918         if (dst == NULL) {
 919                 dev_put(dev);
 920                 ret = -ENOMEM;
 921                 goto out;
 922         }
 923
 924         platform_set_drvdata(pdev, dst);
 925
 926         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 927         if (ret) {
 928                 dev_put(dev);
 929                 goto out;
 930         }
 931
 932         return 0;
 933
 934 out:
 935         dsa_of_remove(&pdev->dev);
 936
 937         return ret;
 938 }
 939
 940 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 941 {
 942         int i;
 943
 944         dst->master_netdev->dsa_ptr = NULL;
 945
 946         /* If we used a tagging format that doesn't have an ethertype
 947          * field, make sure that all packets from this point get sent
 948          * without the tag and go through the regular receive path.
 949          */
 950         wmb();
 951
 952         for (i = 0; i < dst->pd->nr_chips; i++) {
 953                 struct dsa_switch *ds = dst->ds[i];
 954
 955                 if (ds)
 956                         dsa_switch_destroy(ds);
 957         }
 958
 959         dev_put(dst->master_netdev);
 960 }
 961
 962 static int dsa_remove(struct platform_device *pdev)
 963 {
 964         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 965
 966         dsa_remove_dst(dst);
 967         dsa_of_remove(&pdev->dev);
 968
 969         return 0;
 970 }
 971
 972 static void dsa_shutdown(struct platform_device *pdev)
 973 {
 974 }
 975
 976 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 977                           struct packet_type *pt, struct net_device *orig_dev)
 978 {
 979         struct dsa_switch_tree *dst = dev->dsa_ptr;
 980
 981         if (unlikely(dst == NULL)) {
 982                 kfree_skb(skb);
 983                 return 0;
 984         }
 985
 986         return dst->rcv(skb, dev, pt, orig_dev);
 987 }
 988
 989 static struct packet_type dsa_pack_type __read_mostly = {
 990         .type   = cpu_to_be16(ETH_P_XDSA),
 991         .func   = dsa_switch_rcv,
 992 };
 993
 994 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 995         .notifier_call  = dsa_slave_netdevice_event,
 996 };
 997
 998 #ifdef CONFIG_PM_SLEEP
 999 static int dsa_suspend(struct device *d)
1000 {
1001         struct platform_device *pdev = to_platform_device(d);
1002         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1003         int i, ret = 0;
1004
1005         for (i = 0; i < dst->pd->nr_chips; i++) {
1006                 struct dsa_switch *ds = dst->ds[i];
1007
1008                 if (ds != NULL)
1009                         ret = dsa_switch_suspend(ds);
1010         }
1011
1012         return ret;
1013 }
1014
1015 static int dsa_resume(struct device *d)
1016 {
1017         struct platform_device *pdev = to_platform_device(d);
1018         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1019         int i, ret = 0;
1020
1021         for (i = 0; i < dst->pd->nr_chips; i++) {
1022                 struct dsa_switch *ds = dst->ds[i];
1023
1024                 if (ds != NULL)
1025                         ret = dsa_switch_resume(ds);
1026         }
1027
1028         return ret;
1029 }
1030 #endif
1031
1032 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1033
1034 static const struct of_device_id dsa_of_match_table[] = {
1035         { .compatible = "brcm,bcm7445-switch-v4.0" },
1036         { .compatible = "marvell,dsa", },
1037         {}
1038 };
1039 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1040
1041 static struct platform_driver dsa_driver = {
1042         .probe          = dsa_probe,
1043         .remove         = dsa_remove,
1044         .shutdown       = dsa_shutdown,
1045         .driver = {
1046                 .name   = "dsa",
1047                 .of_match_table = dsa_of_match_table,
1048                 .pm     = &dsa_pm_ops,
1049         },
1050 };
1051
1052 static int __init dsa_init_module(void)
1053 {
1054         int rc;
1055
1056         register_netdevice_notifier(&dsa_netdevice_nb);
1057
1058         rc = platform_driver_register(&dsa_driver);
1059         if (rc)
1060                 return rc;
1061
1062         dev_add_pack(&dsa_pack_type);
1063
1064         return 0;
1065 }
1066 module_init(dsa_init_module);
1067
1068 static void __exit dsa_cleanup_module(void)
1069 {
1070         unregister_netdevice_notifier(&dsa_netdevice_nb);
1071         dev_remove_pack(&dsa_pack_type);
1072         platform_driver_unregister(&dsa_driver);
1073 }
1074 module_exit(dsa_cleanup_module);
1075
1076 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1077 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1078 MODULE_LICENSE("GPL");
1079 MODULE_ALIAS("platform:dsa");