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
  33 /* switch driver registration ***********************************************/
  34 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  35 static LIST_HEAD(dsa_switch_drivers);
  36
  37 void register_switch_driver(struct dsa_switch_driver *drv)
  38 {
  39         mutex_lock(&dsa_switch_drivers_mutex);
  40         list_add_tail(&drv->list, &dsa_switch_drivers);
  41         mutex_unlock(&dsa_switch_drivers_mutex);
  42 }
  43 EXPORT_SYMBOL_GPL(register_switch_driver);
  44
  45 void unregister_switch_driver(struct dsa_switch_driver *drv)
  46 {
  47         mutex_lock(&dsa_switch_drivers_mutex);
  48         list_del_init(&drv->list);
  49         mutex_unlock(&dsa_switch_drivers_mutex);
  50 }
  51 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  52
  53 static struct dsa_switch_driver *
  54 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
  55                  const char **_name, void **priv)
  56 {
  57         struct dsa_switch_driver *ret;
  58         struct list_head *list;
  59         const char *name;
  60
  61         ret = NULL;
  62         name = NULL;
  63
  64         mutex_lock(&dsa_switch_drivers_mutex);
  65         list_for_each(list, &dsa_switch_drivers) {
  66                 struct dsa_switch_driver *drv;
  67
  68                 drv = list_entry(list, struct dsa_switch_driver, list);
  69
  70                 name = drv->probe(parent, host_dev, sw_addr, priv);
  71                 if (name != NULL) {
  72                         ret = drv;
  73                         break;
  74                 }
  75         }
  76         mutex_unlock(&dsa_switch_drivers_mutex);
  77
  78         *_name = name;
  79
  80         return ret;
  81 }
  82
  83 /* hwmon support ************************************************************/
  84
  85 #ifdef CONFIG_NET_DSA_HWMON
  86
  87 static ssize_t temp1_input_show(struct device *dev,
  88                                 struct device_attribute *attr, char *buf)
  89 {
  90         struct dsa_switch *ds = dev_get_drvdata(dev);
  91         int temp, ret;
  92
  93         ret = ds->drv->get_temp(ds, &temp);
  94         if (ret < 0)
  95                 return ret;
  96
  97         return sprintf(buf, "%d\n", temp * 1000);
  98 }
  99 static DEVICE_ATTR_RO(temp1_input);
 100
 101 static ssize_t temp1_max_show(struct device *dev,
 102                               struct device_attribute *attr, char *buf)
 103 {
 104         struct dsa_switch *ds = dev_get_drvdata(dev);
 105         int temp, ret;
 106
 107         ret = ds->drv->get_temp_limit(ds, &temp);
 108         if (ret < 0)
 109                 return ret;
 110
 111         return sprintf(buf, "%d\n", temp * 1000);
 112 }
 113
 114 static ssize_t temp1_max_store(struct device *dev,
 115                                struct device_attribute *attr, const char *buf,
 116                                size_t count)
 117 {
 118         struct dsa_switch *ds = dev_get_drvdata(dev);
 119         int temp, ret;
 120
 121         ret = kstrtoint(buf, 0, &temp);
 122         if (ret < 0)
 123                 return ret;
 124
 125         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 126         if (ret < 0)
 127                 return ret;
 128
 129         return count;
 130 }
 131 static DEVICE_ATTR_RW(temp1_max);
 132
 133 static ssize_t temp1_max_alarm_show(struct device *dev,
 134                                     struct device_attribute *attr, char *buf)
 135 {
 136         struct dsa_switch *ds = dev_get_drvdata(dev);
 137         bool alarm;
 138         int ret;
 139
 140         ret = ds->drv->get_temp_alarm(ds, &alarm);
 141         if (ret < 0)
 142                 return ret;
 143
 144         return sprintf(buf, "%d\n", alarm);
 145 }
 146 static DEVICE_ATTR_RO(temp1_max_alarm);
 147
 148 static struct attribute *dsa_hwmon_attrs[] = {
 149         &dev_attr_temp1_input.attr,     /* 0 */
 150         &dev_attr_temp1_max.attr,       /* 1 */
 151         &dev_attr_temp1_max_alarm.attr, /* 2 */
 152         NULL
 153 };
 154
 155 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 156                                        struct attribute *attr, int index)
 157 {
 158         struct device *dev = container_of(kobj, struct device, kobj);
 159         struct dsa_switch *ds = dev_get_drvdata(dev);
 160         struct dsa_switch_driver *drv = ds->drv;
 161         umode_t mode = attr->mode;
 162
 163         if (index == 1) {
 164                 if (!drv->get_temp_limit)
 165                         mode = 0;
 166                 else if (!drv->set_temp_limit)
 167                         mode &= ~S_IWUSR;
 168         } else if (index == 2 && !drv->get_temp_alarm) {
 169                 mode = 0;
 170         }
 171         return mode;
 172 }
 173
 174 static const struct attribute_group dsa_hwmon_group = {
 175         .attrs = dsa_hwmon_attrs,
 176         .is_visible = dsa_hwmon_attrs_visible,
 177 };
 178 __ATTRIBUTE_GROUPS(dsa_hwmon);
 179
 180 #endif /* CONFIG_NET_DSA_HWMON */
 181
 182 /* basic switch operations **************************************************/
 183 static int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct net_device *master)
 184 {
 185         struct dsa_chip_data *cd = ds->cd;
 186         struct device_node *port_dn;
 187         struct phy_device *phydev;
 188         int ret, port, mode;
 189
 190         for (port = 0; port < DSA_MAX_PORTS; port++) {
 191                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 192                         continue;
 193
 194                 port_dn = cd->port_dn[port];
 195                 if (of_phy_is_fixed_link(port_dn)) {
 196                         ret = of_phy_register_fixed_link(port_dn);
 197                         if (ret) {
 198                                 netdev_err(master,
 199                                            "failed to register fixed PHY\n");
 200                                 return ret;
 201                         }
 202                         phydev = of_phy_find_device(port_dn);
 203
 204                         mode = of_get_phy_mode(port_dn);
 205                         if (mode < 0)
 206                                 mode = PHY_INTERFACE_MODE_NA;
 207                         phydev->interface = mode;
 208
 209                         genphy_config_init(phydev);
 210                         genphy_read_status(phydev);
 211                         if (ds->drv->adjust_link)
 212                                 ds->drv->adjust_link(ds, port, phydev);
 213                 }
 214         }
 215         return 0;
 216 }
 217
 218 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 219 {
 220         struct dsa_switch_driver *drv = ds->drv;
 221         struct dsa_switch_tree *dst = ds->dst;
 222         struct dsa_chip_data *cd = ds->cd;
 223         bool valid_name_found = false;
 224         int index = ds->index;
 225         int i, ret;
 226
 227         /*
 228          * Validate supplied switch configuration.
 229          */
 230         for (i = 0; i < DSA_MAX_PORTS; i++) {
 231                 char *name;
 232
 233                 name = cd->port_names[i];
 234                 if (name == NULL)
 235                         continue;
 236
 237                 if (!strcmp(name, "cpu")) {
 238                         if (dst->cpu_switch != -1) {
 239                                 netdev_err(dst->master_netdev,
 240                                            "multiple cpu ports?!\n");
 241                                 ret = -EINVAL;
 242                                 goto out;
 243                         }
 244                         dst->cpu_switch = index;
 245                         dst->cpu_port = i;
 246                 } else if (!strcmp(name, "dsa")) {
 247                         ds->dsa_port_mask |= 1 << i;
 248                 } else {
 249                         ds->enabled_port_mask |= 1 << i;
 250                 }
 251                 valid_name_found = true;
 252         }
 253
 254         if (!valid_name_found && i == DSA_MAX_PORTS) {
 255                 ret = -EINVAL;
 256                 goto out;
 257         }
 258
 259         /* Make the built-in MII bus mask match the number of ports,
 260          * switch drivers can override this later
 261          */
 262         ds->phys_mii_mask = ds->enabled_port_mask;
 263
 264         /*
 265          * If the CPU connects to this switch, set the switch tree
 266          * tagging protocol to the preferred tagging format of this
 267          * switch.
 268          */
 269         if (dst->cpu_switch == index) {
 270                 switch (drv->tag_protocol) {
 271 #ifdef CONFIG_NET_DSA_TAG_DSA
 272                 case DSA_TAG_PROTO_DSA:
 273                         dst->rcv = dsa_netdev_ops.rcv;
 274                         break;
 275 #endif
 276 #ifdef CONFIG_NET_DSA_TAG_EDSA
 277                 case DSA_TAG_PROTO_EDSA:
 278                         dst->rcv = edsa_netdev_ops.rcv;
 279                         break;
 280 #endif
 281 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 282                 case DSA_TAG_PROTO_TRAILER:
 283                         dst->rcv = trailer_netdev_ops.rcv;
 284                         break;
 285 #endif
 286 #ifdef CONFIG_NET_DSA_TAG_BRCM
 287                 case DSA_TAG_PROTO_BRCM:
 288                         dst->rcv = brcm_netdev_ops.rcv;
 289                         break;
 290 #endif
 291                 case DSA_TAG_PROTO_NONE:
 292                         break;
 293                 default:
 294                         ret = -ENOPROTOOPT;
 295                         goto out;
 296                 }
 297
 298                 dst->tag_protocol = drv->tag_protocol;
 299         }
 300
 301         /*
 302          * Do basic register setup.
 303          */
 304         ret = drv->setup(ds);
 305         if (ret < 0)
 306                 goto out;
 307
 308         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 309         if (ret < 0)
 310                 goto out;
 311
 312         ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 313         if (ds->slave_mii_bus == NULL) {
 314                 ret = -ENOMEM;
 315                 goto out;
 316         }
 317         dsa_slave_mii_bus_init(ds);
 318
 319         ret = mdiobus_register(ds->slave_mii_bus);
 320         if (ret < 0)
 321                 goto out;
 322
 323
 324         /*
 325          * Create network devices for physical switch ports.
 326          */
 327         for (i = 0; i < DSA_MAX_PORTS; i++) {
 328                 if (!(ds->enabled_port_mask & (1 << i)))
 329                         continue;
 330
 331                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 332                 if (ret < 0) {
 333                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 334                                    index, i, cd->port_names[i], ret);
 335                         ret = 0;
 336                 }
 337         }
 338
 339         /* Perform configuration of the CPU and DSA ports */
 340         ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
 341         if (ret < 0) {
 342                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 343                            index);
 344                 ret = 0;
 345         }
 346
 347 #ifdef CONFIG_NET_DSA_HWMON
 348         /* If the switch provides a temperature sensor,
 349          * register with hardware monitoring subsystem.
 350          * Treat registration error as non-fatal and ignore it.
 351          */
 352         if (drv->get_temp) {
 353                 const char *netname = netdev_name(dst->master_netdev);
 354                 char hname[IFNAMSIZ + 1];
 355                 int i, j;
 356
 357                 /* Create valid hwmon 'name' attribute */
 358                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 359                         if (isalnum(netname[i]))
 360                                 hname[j++] = netname[i];
 361                 }
 362                 hname[j] = '\0';
 363                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 364                           hname, index);
 365                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 366                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 367                 if (IS_ERR(ds->hwmon_dev))
 368                         ds->hwmon_dev = NULL;
 369         }
 370 #endif /* CONFIG_NET_DSA_HWMON */
 371
 372         return ret;
 373
 374 out:
 375         return ret;
 376 }
 377
 378 static struct dsa_switch *
 379 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 380                  struct device *parent, struct device *host_dev)
 381 {
 382         struct dsa_chip_data *cd = dst->pd->chip + index;
 383         struct dsa_switch_driver *drv;
 384         struct dsa_switch *ds;
 385         int ret;
 386         const char *name;
 387         void *priv;
 388
 389         /*
 390          * Probe for switch model.
 391          */
 392         drv = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 393         if (drv == NULL) {
 394                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 395                            index);
 396                 return ERR_PTR(-EINVAL);
 397         }
 398         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 399                     index, name);
 400
 401
 402         /*
 403          * Allocate and initialise switch state.
 404          */
 405         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 406         if (ds == NULL)
 407                 return ERR_PTR(-ENOMEM);
 408
 409         ds->dst = dst;
 410         ds->index = index;
 411         ds->cd = cd;
 412         ds->drv = drv;
 413         ds->priv = priv;
 414         ds->dev = parent;
 415
 416         ret = dsa_switch_setup_one(ds, parent);
 417         if (ret)
 418                 return ERR_PTR(ret);
 419
 420         return ds;
 421 }
 422
 423 static void dsa_switch_destroy(struct dsa_switch *ds)
 424 {
 425         struct device_node *port_dn;
 426         struct phy_device *phydev;
 427         struct dsa_chip_data *cd = ds->cd;
 428         int port;
 429
 430 #ifdef CONFIG_NET_DSA_HWMON
 431         if (ds->hwmon_dev)
 432                 hwmon_device_unregister(ds->hwmon_dev);
 433 #endif
 434
 435         /* Destroy network devices for physical switch ports. */
 436         for (port = 0; port < DSA_MAX_PORTS; port++) {
 437                 if (!(ds->enabled_port_mask & (1 << port)))
 438                         continue;
 439
 440                 if (!ds->ports[port])
 441                         continue;
 442
 443                 dsa_slave_destroy(ds->ports[port]);
 444         }
 445
 446         /* Remove any fixed link PHYs */
 447         for (port = 0; port < DSA_MAX_PORTS; port++) {
 448                 port_dn = cd->port_dn[port];
 449                 if (of_phy_is_fixed_link(port_dn)) {
 450                         phydev = of_phy_find_device(port_dn);
 451                         if (phydev) {
 452                                 phy_device_free(phydev);
 453                                 of_node_put(port_dn);
 454                                 fixed_phy_unregister(phydev);
 455                         }
 456                 }
 457         }
 458
 459         mdiobus_unregister(ds->slave_mii_bus);
 460 }
 461
 462 #ifdef CONFIG_PM_SLEEP
 463 static int dsa_switch_suspend(struct dsa_switch *ds)
 464 {
 465         int i, ret = 0;
 466
 467         /* Suspend slave network devices */
 468         for (i = 0; i < DSA_MAX_PORTS; i++) {
 469                 if (!dsa_is_port_initialized(ds, i))
 470                         continue;
 471
 472                 ret = dsa_slave_suspend(ds->ports[i]);
 473                 if (ret)
 474                         return ret;
 475         }
 476
 477         if (ds->drv->suspend)
 478                 ret = ds->drv->suspend(ds);
 479
 480         return ret;
 481 }
 482
 483 static int dsa_switch_resume(struct dsa_switch *ds)
 484 {
 485         int i, ret = 0;
 486
 487         if (ds->drv->resume)
 488                 ret = ds->drv->resume(ds);
 489
 490         if (ret)
 491                 return ret;
 492
 493         /* Resume slave network devices */
 494         for (i = 0; i < DSA_MAX_PORTS; i++) {
 495                 if (!dsa_is_port_initialized(ds, i))
 496                         continue;
 497
 498                 ret = dsa_slave_resume(ds->ports[i]);
 499                 if (ret)
 500                         return ret;
 501         }
 502
 503         return 0;
 504 }
 505 #endif
 506
 507 /* platform driver init and cleanup *****************************************/
 508 static int dev_is_class(struct device *dev, void *class)
 509 {
 510         if (dev->class != NULL && !strcmp(dev->class->name, class))
 511                 return 1;
 512
 513         return 0;
 514 }
 515
 516 static struct device *dev_find_class(struct device *parent, char *class)
 517 {
 518         if (dev_is_class(parent, class)) {
 519                 get_device(parent);
 520                 return parent;
 521         }
 522
 523         return device_find_child(parent, class, dev_is_class);
 524 }
 525
 526 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 527 {
 528         struct device *d;
 529
 530         d = dev_find_class(dev, "mdio_bus");
 531         if (d != NULL) {
 532                 struct mii_bus *bus;
 533
 534                 bus = to_mii_bus(d);
 535                 put_device(d);
 536
 537                 return bus;
 538         }
 539
 540         return NULL;
 541 }
 542 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 543
 544 static struct net_device *dev_to_net_device(struct device *dev)
 545 {
 546         struct device *d;
 547
 548         d = dev_find_class(dev, "net");
 549         if (d != NULL) {
 550                 struct net_device *nd;
 551
 552                 nd = to_net_dev(d);
 553                 dev_hold(nd);
 554                 put_device(d);
 555
 556                 return nd;
 557         }
 558
 559         return NULL;
 560 }
 561
 562 #ifdef CONFIG_OF
 563 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 564                                         struct dsa_chip_data *cd,
 565                                         int chip_index, int port_index,
 566                                         struct device_node *link)
 567 {
 568         const __be32 *reg;
 569         int link_sw_addr;
 570         struct device_node *parent_sw;
 571         int len;
 572
 573         parent_sw = of_get_parent(link);
 574         if (!parent_sw)
 575                 return -EINVAL;
 576
 577         reg = of_get_property(parent_sw, "reg", &len);
 578         if (!reg || (len != sizeof(*reg) * 2))
 579                 return -EINVAL;
 580
 581         /*
 582          * Get the destination switch number from the second field of its 'reg'
 583          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 584          */
 585         link_sw_addr = be32_to_cpup(reg + 1);
 586
 587         if (link_sw_addr >= pd->nr_chips)
 588                 return -EINVAL;
 589
 590         /* First time routing table allocation */
 591         if (!cd->rtable) {
 592                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
 593                                            GFP_KERNEL);
 594                 if (!cd->rtable)
 595                         return -ENOMEM;
 596
 597                 /* default to no valid uplink/downlink */
 598                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
 599         }
 600
 601         cd->rtable[link_sw_addr] = port_index;
 602
 603         return 0;
 604 }
 605
 606 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 607                               struct dsa_chip_data *cd,
 608                               int chip_index, int port_index,
 609                               struct device_node *port,
 610                               const char *port_name)
 611 {
 612         struct device_node *link;
 613         int link_index;
 614         int ret;
 615
 616         for (link_index = 0;; link_index++) {
 617                 link = of_parse_phandle(port, "link", link_index);
 618                 if (!link)
 619                         break;
 620
 621                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 622                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 623                                                          port_index, link);
 624                         if (ret)
 625                                 return ret;
 626                 }
 627         }
 628         return 0;
 629 }
 630
 631 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 632 {
 633         int i;
 634         int port_index;
 635
 636         for (i = 0; i < pd->nr_chips; i++) {
 637                 port_index = 0;
 638                 while (port_index < DSA_MAX_PORTS) {
 639                         kfree(pd->chip[i].port_names[port_index]);
 640                         port_index++;
 641                 }
 642                 kfree(pd->chip[i].rtable);
 643
 644                 /* Drop our reference to the MDIO bus device */
 645                 if (pd->chip[i].host_dev)
 646                         put_device(pd->chip[i].host_dev);
 647         }
 648         kfree(pd->chip);
 649 }
 650
 651 static int dsa_of_probe(struct device *dev)
 652 {
 653         struct device_node *np = dev->of_node;
 654         struct device_node *child, *mdio, *ethernet, *port;
 655         struct mii_bus *mdio_bus, *mdio_bus_switch;
 656         struct net_device *ethernet_dev;
 657         struct dsa_platform_data *pd;
 658         struct dsa_chip_data *cd;
 659         const char *port_name;
 660         int chip_index, port_index;
 661         const unsigned int *sw_addr, *port_reg;
 662         u32 eeprom_len;
 663         int ret;
 664
 665         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 666         if (!mdio)
 667                 return -EINVAL;
 668
 669         mdio_bus = of_mdio_find_bus(mdio);
 670         if (!mdio_bus)
 671                 return -EPROBE_DEFER;
 672
 673         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 674         if (!ethernet) {
 675                 ret = -EINVAL;
 676                 goto out_put_mdio;
 677         }
 678
 679         ethernet_dev = of_find_net_device_by_node(ethernet);
 680         if (!ethernet_dev) {
 681                 ret = -EPROBE_DEFER;
 682                 goto out_put_mdio;
 683         }
 684
 685         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 686         if (!pd) {
 687                 ret = -ENOMEM;
 688                 goto out_put_ethernet;
 689         }
 690
 691         dev->platform_data = pd;
 692         pd->of_netdev = ethernet_dev;
 693         pd->nr_chips = of_get_available_child_count(np);
 694         if (pd->nr_chips > DSA_MAX_SWITCHES)
 695                 pd->nr_chips = DSA_MAX_SWITCHES;
 696
 697         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 698                            GFP_KERNEL);
 699         if (!pd->chip) {
 700                 ret = -ENOMEM;
 701                 goto out_free;
 702         }
 703
 704         chip_index = -1;
 705         for_each_available_child_of_node(np, child) {
 706                 chip_index++;
 707                 cd = &pd->chip[chip_index];
 708
 709                 cd->of_node = child;
 710
 711                 /* When assigning the host device, increment its refcount */
 712                 cd->host_dev = get_device(&mdio_bus->dev);
 713
 714                 sw_addr = of_get_property(child, "reg", NULL);
 715                 if (!sw_addr)
 716                         continue;
 717
 718                 cd->sw_addr = be32_to_cpup(sw_addr);
 719                 if (cd->sw_addr >= PHY_MAX_ADDR)
 720                         continue;
 721
 722                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 723                         cd->eeprom_len = eeprom_len;
 724
 725                 mdio = of_parse_phandle(child, "mii-bus", 0);
 726                 if (mdio) {
 727                         mdio_bus_switch = of_mdio_find_bus(mdio);
 728                         if (!mdio_bus_switch) {
 729                                 ret = -EPROBE_DEFER;
 730                                 goto out_free_chip;
 731                         }
 732
 733                         /* Drop the mdio_bus device ref, replacing the host
 734                          * device with the mdio_bus_switch device, keeping
 735                          * the refcount from of_mdio_find_bus() above.
 736                          */
 737                         put_device(cd->host_dev);
 738                         cd->host_dev = &mdio_bus_switch->dev;
 739                 }
 740
 741                 for_each_available_child_of_node(child, port) {
 742                         port_reg = of_get_property(port, "reg", NULL);
 743                         if (!port_reg)
 744                                 continue;
 745
 746                         port_index = be32_to_cpup(port_reg);
 747                         if (port_index >= DSA_MAX_PORTS)
 748                                 break;
 749
 750                         port_name = of_get_property(port, "label", NULL);
 751                         if (!port_name)
 752                                 continue;
 753
 754                         cd->port_dn[port_index] = port;
 755
 756                         cd->port_names[port_index] = kstrdup(port_name,
 757                                         GFP_KERNEL);
 758                         if (!cd->port_names[port_index]) {
 759                                 ret = -ENOMEM;
 760                                 goto out_free_chip;
 761                         }
 762
 763                         ret = dsa_of_probe_links(pd, cd, chip_index,
 764                                                  port_index, port, port_name);
 765                         if (ret)
 766                                 goto out_free_chip;
 767
 768                 }
 769         }
 770
 771         /* The individual chips hold their own refcount on the mdio bus,
 772          * so drop ours */
 773         put_device(&mdio_bus->dev);
 774
 775         return 0;
 776
 777 out_free_chip:
 778         dsa_of_free_platform_data(pd);
 779 out_free:
 780         kfree(pd);
 781         dev->platform_data = NULL;
 782 out_put_ethernet:
 783         put_device(&ethernet_dev->dev);
 784 out_put_mdio:
 785         put_device(&mdio_bus->dev);
 786         return ret;
 787 }
 788
 789 static void dsa_of_remove(struct device *dev)
 790 {
 791         struct dsa_platform_data *pd = dev->platform_data;
 792
 793         if (!dev->of_node)
 794                 return;
 795
 796         dsa_of_free_platform_data(pd);
 797         put_device(&pd->of_netdev->dev);
 798         kfree(pd);
 799 }
 800 #else
 801 static inline int dsa_of_probe(struct device *dev)
 802 {
 803         return 0;
 804 }
 805
 806 static inline void dsa_of_remove(struct device *dev)
 807 {
 808 }
 809 #endif
 810
 811 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 812                          struct device *parent, struct dsa_platform_data *pd)
 813 {
 814         int i;
 815         unsigned configured = 0;
 816
 817         dst->pd = pd;
 818         dst->master_netdev = dev;
 819         dst->cpu_switch = -1;
 820         dst->cpu_port = -1;
 821
 822         for (i = 0; i < pd->nr_chips; i++) {
 823                 struct dsa_switch *ds;
 824
 825                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 826                 if (IS_ERR(ds)) {
 827                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 828                                    i, PTR_ERR(ds));
 829                         continue;
 830                 }
 831
 832                 dst->ds[i] = ds;
 833
 834                 ++configured;
 835         }
 836
 837         /*
 838          * If no switch was found, exit cleanly
 839          */
 840         if (!configured)
 841                 return -EPROBE_DEFER;
 842
 843         /*
 844          * If we use a tagging format that doesn't have an ethertype
 845          * field, make sure that all packets from this point on get
 846          * sent to the tag format's receive function.
 847          */
 848         wmb();
 849         dev->dsa_ptr = (void *)dst;
 850
 851         return 0;
 852 }
 853
 854 static int dsa_probe(struct platform_device *pdev)
 855 {
 856         struct dsa_platform_data *pd = pdev->dev.platform_data;
 857         struct net_device *dev;
 858         struct dsa_switch_tree *dst;
 859         int ret;
 860
 861         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 862                        dsa_driver_version);
 863
 864         if (pdev->dev.of_node) {
 865                 ret = dsa_of_probe(&pdev->dev);
 866                 if (ret)
 867                         return ret;
 868
 869                 pd = pdev->dev.platform_data;
 870         }
 871
 872         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 873                 return -EINVAL;
 874
 875         if (pd->of_netdev) {
 876                 dev = pd->of_netdev;
 877                 dev_hold(dev);
 878         } else {
 879                 dev = dev_to_net_device(pd->netdev);
 880         }
 881         if (dev == NULL) {
 882                 ret = -EPROBE_DEFER;
 883                 goto out;
 884         }
 885
 886         if (dev->dsa_ptr != NULL) {
 887                 dev_put(dev);
 888                 ret = -EEXIST;
 889                 goto out;
 890         }
 891
 892         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 893         if (dst == NULL) {
 894                 dev_put(dev);
 895                 ret = -ENOMEM;
 896                 goto out;
 897         }
 898
 899         platform_set_drvdata(pdev, dst);
 900
 901         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 902         if (ret) {
 903                 dev_put(dev);
 904                 goto out;
 905         }
 906
 907         return 0;
 908
 909 out:
 910         dsa_of_remove(&pdev->dev);
 911
 912         return ret;
 913 }
 914
 915 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 916 {
 917         int i;
 918
 919         dst->master_netdev->dsa_ptr = NULL;
 920
 921         /* If we used a tagging format that doesn't have an ethertype
 922          * field, make sure that all packets from this point get sent
 923          * without the tag and go through the regular receive path.
 924          */
 925         wmb();
 926
 927         for (i = 0; i < dst->pd->nr_chips; i++) {
 928                 struct dsa_switch *ds = dst->ds[i];
 929
 930                 if (ds)
 931                         dsa_switch_destroy(ds);
 932         }
 933
 934         dev_put(dst->master_netdev);
 935 }
 936
 937 static int dsa_remove(struct platform_device *pdev)
 938 {
 939         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 940
 941         dsa_remove_dst(dst);
 942         dsa_of_remove(&pdev->dev);
 943
 944         return 0;
 945 }
 946
 947 static void dsa_shutdown(struct platform_device *pdev)
 948 {
 949 }
 950
 951 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 952                           struct packet_type *pt, struct net_device *orig_dev)
 953 {
 954         struct dsa_switch_tree *dst = dev->dsa_ptr;
 955
 956         if (unlikely(dst == NULL)) {
 957                 kfree_skb(skb);
 958                 return 0;
 959         }
 960
 961         return dst->rcv(skb, dev, pt, orig_dev);
 962 }
 963
 964 static struct packet_type dsa_pack_type __read_mostly = {
 965         .type   = cpu_to_be16(ETH_P_XDSA),
 966         .func   = dsa_switch_rcv,
 967 };
 968
 969 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 970         .notifier_call  = dsa_slave_netdevice_event,
 971 };
 972
 973 #ifdef CONFIG_PM_SLEEP
 974 static int dsa_suspend(struct device *d)
 975 {
 976         struct platform_device *pdev = to_platform_device(d);
 977         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 978         int i, ret = 0;
 979
 980         for (i = 0; i < dst->pd->nr_chips; i++) {
 981                 struct dsa_switch *ds = dst->ds[i];
 982
 983                 if (ds != NULL)
 984                         ret = dsa_switch_suspend(ds);
 985         }
 986
 987         return ret;
 988 }
 989
 990 static int dsa_resume(struct device *d)
 991 {
 992         struct platform_device *pdev = to_platform_device(d);
 993         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 994         int i, ret = 0;
 995
 996         for (i = 0; i < dst->pd->nr_chips; i++) {
 997                 struct dsa_switch *ds = dst->ds[i];
 998
 999                 if (ds != NULL)
1000                         ret = dsa_switch_resume(ds);
1001         }
1002
1003         return ret;
1004 }
1005 #endif
1006
1007 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1008
1009 static const struct of_device_id dsa_of_match_table[] = {
1010         { .compatible = "brcm,bcm7445-switch-v4.0" },
1011         { .compatible = "marvell,dsa", },
1012         {}
1013 };
1014 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1015
1016 static struct platform_driver dsa_driver = {
1017         .probe          = dsa_probe,
1018         .remove         = dsa_remove,
1019         .shutdown       = dsa_shutdown,
1020         .driver = {
1021                 .name   = "dsa",
1022                 .of_match_table = dsa_of_match_table,
1023                 .pm     = &dsa_pm_ops,
1024         },
1025 };
1026
1027 static int __init dsa_init_module(void)
1028 {
1029         int rc;
1030
1031         register_netdevice_notifier(&dsa_netdevice_nb);
1032
1033         rc = platform_driver_register(&dsa_driver);
1034         if (rc)
1035                 return rc;
1036
1037         dev_add_pack(&dsa_pack_type);
1038
1039         return 0;
1040 }
1041 module_init(dsa_init_module);
1042
1043 static void __exit dsa_cleanup_module(void)
1044 {
1045         unregister_netdevice_notifier(&dsa_netdevice_nb);
1046         dev_remove_pack(&dsa_pack_type);
1047         platform_driver_unregister(&dsa_driver);
1048 }
1049 module_exit(dsa_cleanup_module);
1050
1051 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1052 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1053 MODULE_LICENSE("GPL");
1054 MODULE_ALIAS("platform:dsa");