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 device_node *port_dn;
 186         struct phy_device *phydev;
 187         int ret, port, mode;
 188
 189         for (port = 0; port < DSA_MAX_PORTS; port++) {
 190                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 191                         continue;
 192
 193                 port_dn = ds->ports[port].dn;
 194                 if (of_phy_is_fixed_link(port_dn)) {
 195                         ret = of_phy_register_fixed_link(port_dn);
 196                         if (ret) {
 197                                 netdev_err(master,
 198                                            "failed to register fixed PHY\n");
 199                                 return ret;
 200                         }
 201                         phydev = of_phy_find_device(port_dn);
 202
 203                         mode = of_get_phy_mode(port_dn);
 204                         if (mode < 0)
 205                                 mode = PHY_INTERFACE_MODE_NA;
 206                         phydev->interface = mode;
 207
 208                         genphy_config_init(phydev);
 209                         genphy_read_status(phydev);
 210                         if (ds->drv->adjust_link)
 211                                 ds->drv->adjust_link(ds, port, phydev);
 212                 }
 213         }
 214         return 0;
 215 }
 216
 217 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 218 {
 219         struct dsa_switch_driver *drv = ds->drv;
 220         struct dsa_switch_tree *dst = ds->dst;
 221         struct dsa_chip_data *cd = ds->cd;
 222         bool valid_name_found = false;
 223         int index = ds->index;
 224         int i, ret;
 225
 226         /*
 227          * Validate supplied switch configuration.
 228          */
 229         for (i = 0; i < DSA_MAX_PORTS; i++) {
 230                 char *name;
 231
 232                 name = cd->port_names[i];
 233                 if (name == NULL)
 234                         continue;
 235
 236                 if (!strcmp(name, "cpu")) {
 237                         if (dst->cpu_switch != -1) {
 238                                 netdev_err(dst->master_netdev,
 239                                            "multiple cpu ports?!\n");
 240                                 ret = -EINVAL;
 241                                 goto out;
 242                         }
 243                         dst->cpu_switch = index;
 244                         dst->cpu_port = i;
 245                 } else if (!strcmp(name, "dsa")) {
 246                         ds->dsa_port_mask |= 1 << i;
 247                 } else {
 248                         ds->enabled_port_mask |= 1 << i;
 249                 }
 250                 valid_name_found = true;
 251         }
 252
 253         if (!valid_name_found && i == DSA_MAX_PORTS) {
 254                 ret = -EINVAL;
 255                 goto out;
 256         }
 257
 258         /* Make the built-in MII bus mask match the number of ports,
 259          * switch drivers can override this later
 260          */
 261         ds->phys_mii_mask = ds->enabled_port_mask;
 262
 263         /*
 264          * If the CPU connects to this switch, set the switch tree
 265          * tagging protocol to the preferred tagging format of this
 266          * switch.
 267          */
 268         if (dst->cpu_switch == index) {
 269                 switch (drv->tag_protocol) {
 270 #ifdef CONFIG_NET_DSA_TAG_DSA
 271                 case DSA_TAG_PROTO_DSA:
 272                         dst->rcv = dsa_netdev_ops.rcv;
 273                         break;
 274 #endif
 275 #ifdef CONFIG_NET_DSA_TAG_EDSA
 276                 case DSA_TAG_PROTO_EDSA:
 277                         dst->rcv = edsa_netdev_ops.rcv;
 278                         break;
 279 #endif
 280 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 281                 case DSA_TAG_PROTO_TRAILER:
 282                         dst->rcv = trailer_netdev_ops.rcv;
 283                         break;
 284 #endif
 285 #ifdef CONFIG_NET_DSA_TAG_BRCM
 286                 case DSA_TAG_PROTO_BRCM:
 287                         dst->rcv = brcm_netdev_ops.rcv;
 288                         break;
 289 #endif
 290                 case DSA_TAG_PROTO_NONE:
 291                         break;
 292                 default:
 293                         ret = -ENOPROTOOPT;
 294                         goto out;
 295                 }
 296
 297                 dst->tag_protocol = drv->tag_protocol;
 298         }
 299
 300         /*
 301          * Do basic register setup.
 302          */
 303         ret = drv->setup(ds);
 304         if (ret < 0)
 305                 goto out;
 306
 307         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 308         if (ret < 0)
 309                 goto out;
 310
 311         ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 312         if (ds->slave_mii_bus == NULL) {
 313                 ret = -ENOMEM;
 314                 goto out;
 315         }
 316         dsa_slave_mii_bus_init(ds);
 317
 318         ret = mdiobus_register(ds->slave_mii_bus);
 319         if (ret < 0)
 320                 goto out;
 321
 322
 323         /*
 324          * Create network devices for physical switch ports.
 325          */
 326         for (i = 0; i < DSA_MAX_PORTS; i++) {
 327                 ds->ports[i].dn = cd->port_dn[i];
 328
 329                 if (!(ds->enabled_port_mask & (1 << i)))
 330                         continue;
 331
 332                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 333                 if (ret < 0) {
 334                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 335                                    index, i, cd->port_names[i], ret);
 336                         ret = 0;
 337                 }
 338         }
 339
 340         /* Perform configuration of the CPU and DSA ports */
 341         ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
 342         if (ret < 0) {
 343                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 344                            index);
 345                 ret = 0;
 346         }
 347
 348 #ifdef CONFIG_NET_DSA_HWMON
 349         /* If the switch provides a temperature sensor,
 350          * register with hardware monitoring subsystem.
 351          * Treat registration error as non-fatal and ignore it.
 352          */
 353         if (drv->get_temp) {
 354                 const char *netname = netdev_name(dst->master_netdev);
 355                 char hname[IFNAMSIZ + 1];
 356                 int i, j;
 357
 358                 /* Create valid hwmon 'name' attribute */
 359                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 360                         if (isalnum(netname[i]))
 361                                 hname[j++] = netname[i];
 362                 }
 363                 hname[j] = '\0';
 364                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 365                           hname, index);
 366                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 367                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 368                 if (IS_ERR(ds->hwmon_dev))
 369                         ds->hwmon_dev = NULL;
 370         }
 371 #endif /* CONFIG_NET_DSA_HWMON */
 372
 373         return ret;
 374
 375 out:
 376         return ret;
 377 }
 378
 379 static struct dsa_switch *
 380 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 381                  struct device *parent, struct device *host_dev)
 382 {
 383         struct dsa_chip_data *cd = dst->pd->chip + index;
 384         struct dsa_switch_driver *drv;
 385         struct dsa_switch *ds;
 386         int ret;
 387         const char *name;
 388         void *priv;
 389
 390         /*
 391          * Probe for switch model.
 392          */
 393         drv = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 394         if (drv == NULL) {
 395                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 396                            index);
 397                 return ERR_PTR(-EINVAL);
 398         }
 399         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 400                     index, name);
 401
 402
 403         /*
 404          * Allocate and initialise switch state.
 405          */
 406         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 407         if (ds == NULL)
 408                 return ERR_PTR(-ENOMEM);
 409
 410         ds->dst = dst;
 411         ds->index = index;
 412         ds->cd = cd;
 413         ds->drv = drv;
 414         ds->priv = priv;
 415         ds->dev = parent;
 416
 417         ret = dsa_switch_setup_one(ds, parent);
 418         if (ret)
 419                 return ERR_PTR(ret);
 420
 421         return ds;
 422 }
 423
 424 static void dsa_switch_destroy(struct dsa_switch *ds)
 425 {
 426         struct device_node *port_dn;
 427         struct phy_device *phydev;
 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].netdev)
 441                         continue;
 442
 443                 dsa_slave_destroy(ds->ports[port].netdev);
 444         }
 445
 446         /* Remove any fixed link PHYs */
 447         for (port = 0; port < DSA_MAX_PORTS; port++) {
 448                 port_dn = ds->ports[port].dn;
 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].netdev);
 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].netdev);
 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         cd->rtable[link_sw_addr] = port_index;
 591
 592         return 0;
 593 }
 594
 595 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 596                               struct dsa_chip_data *cd,
 597                               int chip_index, int port_index,
 598                               struct device_node *port,
 599                               const char *port_name)
 600 {
 601         struct device_node *link;
 602         int link_index;
 603         int ret;
 604
 605         for (link_index = 0;; link_index++) {
 606                 link = of_parse_phandle(port, "link", link_index);
 607                 if (!link)
 608                         break;
 609
 610                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 611                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 612                                                          port_index, link);
 613                         if (ret)
 614                                 return ret;
 615                 }
 616         }
 617         return 0;
 618 }
 619
 620 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 621 {
 622         int i;
 623         int port_index;
 624
 625         for (i = 0; i < pd->nr_chips; i++) {
 626                 port_index = 0;
 627                 while (port_index < DSA_MAX_PORTS) {
 628                         kfree(pd->chip[i].port_names[port_index]);
 629                         port_index++;
 630                 }
 631
 632                 /* Drop our reference to the MDIO bus device */
 633                 if (pd->chip[i].host_dev)
 634                         put_device(pd->chip[i].host_dev);
 635         }
 636         kfree(pd->chip);
 637 }
 638
 639 static int dsa_of_probe(struct device *dev)
 640 {
 641         struct device_node *np = dev->of_node;
 642         struct device_node *child, *mdio, *ethernet, *port;
 643         struct mii_bus *mdio_bus, *mdio_bus_switch;
 644         struct net_device *ethernet_dev;
 645         struct dsa_platform_data *pd;
 646         struct dsa_chip_data *cd;
 647         const char *port_name;
 648         int chip_index, port_index;
 649         const unsigned int *sw_addr, *port_reg;
 650         u32 eeprom_len;
 651         int ret;
 652
 653         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 654         if (!mdio)
 655                 return -EINVAL;
 656
 657         mdio_bus = of_mdio_find_bus(mdio);
 658         if (!mdio_bus)
 659                 return -EPROBE_DEFER;
 660
 661         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 662         if (!ethernet) {
 663                 ret = -EINVAL;
 664                 goto out_put_mdio;
 665         }
 666
 667         ethernet_dev = of_find_net_device_by_node(ethernet);
 668         if (!ethernet_dev) {
 669                 ret = -EPROBE_DEFER;
 670                 goto out_put_mdio;
 671         }
 672
 673         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 674         if (!pd) {
 675                 ret = -ENOMEM;
 676                 goto out_put_ethernet;
 677         }
 678
 679         dev->platform_data = pd;
 680         pd->of_netdev = ethernet_dev;
 681         pd->nr_chips = of_get_available_child_count(np);
 682         if (pd->nr_chips > DSA_MAX_SWITCHES)
 683                 pd->nr_chips = DSA_MAX_SWITCHES;
 684
 685         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 686                            GFP_KERNEL);
 687         if (!pd->chip) {
 688                 ret = -ENOMEM;
 689                 goto out_free;
 690         }
 691
 692         chip_index = -1;
 693         for_each_available_child_of_node(np, child) {
 694                 chip_index++;
 695                 cd = &pd->chip[chip_index];
 696
 697                 cd->of_node = child;
 698
 699                 /* When assigning the host device, increment its refcount */
 700                 cd->host_dev = get_device(&mdio_bus->dev);
 701
 702                 sw_addr = of_get_property(child, "reg", NULL);
 703                 if (!sw_addr)
 704                         continue;
 705
 706                 cd->sw_addr = be32_to_cpup(sw_addr);
 707                 if (cd->sw_addr >= PHY_MAX_ADDR)
 708                         continue;
 709
 710                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 711                         cd->eeprom_len = eeprom_len;
 712
 713                 mdio = of_parse_phandle(child, "mii-bus", 0);
 714                 if (mdio) {
 715                         mdio_bus_switch = of_mdio_find_bus(mdio);
 716                         if (!mdio_bus_switch) {
 717                                 ret = -EPROBE_DEFER;
 718                                 goto out_free_chip;
 719                         }
 720
 721                         /* Drop the mdio_bus device ref, replacing the host
 722                          * device with the mdio_bus_switch device, keeping
 723                          * the refcount from of_mdio_find_bus() above.
 724                          */
 725                         put_device(cd->host_dev);
 726                         cd->host_dev = &mdio_bus_switch->dev;
 727                 }
 728
 729                 for_each_available_child_of_node(child, port) {
 730                         port_reg = of_get_property(port, "reg", NULL);
 731                         if (!port_reg)
 732                                 continue;
 733
 734                         port_index = be32_to_cpup(port_reg);
 735                         if (port_index >= DSA_MAX_PORTS)
 736                                 break;
 737
 738                         port_name = of_get_property(port, "label", NULL);
 739                         if (!port_name)
 740                                 continue;
 741
 742                         cd->port_dn[port_index] = port;
 743
 744                         cd->port_names[port_index] = kstrdup(port_name,
 745                                         GFP_KERNEL);
 746                         if (!cd->port_names[port_index]) {
 747                                 ret = -ENOMEM;
 748                                 goto out_free_chip;
 749                         }
 750
 751                         ret = dsa_of_probe_links(pd, cd, chip_index,
 752                                                  port_index, port, port_name);
 753                         if (ret)
 754                                 goto out_free_chip;
 755
 756                 }
 757         }
 758
 759         /* The individual chips hold their own refcount on the mdio bus,
 760          * so drop ours */
 761         put_device(&mdio_bus->dev);
 762
 763         return 0;
 764
 765 out_free_chip:
 766         dsa_of_free_platform_data(pd);
 767 out_free:
 768         kfree(pd);
 769         dev->platform_data = NULL;
 770 out_put_ethernet:
 771         put_device(&ethernet_dev->dev);
 772 out_put_mdio:
 773         put_device(&mdio_bus->dev);
 774         return ret;
 775 }
 776
 777 static void dsa_of_remove(struct device *dev)
 778 {
 779         struct dsa_platform_data *pd = dev->platform_data;
 780
 781         if (!dev->of_node)
 782                 return;
 783
 784         dsa_of_free_platform_data(pd);
 785         put_device(&pd->of_netdev->dev);
 786         kfree(pd);
 787 }
 788 #else
 789 static inline int dsa_of_probe(struct device *dev)
 790 {
 791         return 0;
 792 }
 793
 794 static inline void dsa_of_remove(struct device *dev)
 795 {
 796 }
 797 #endif
 798
 799 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 800                          struct device *parent, struct dsa_platform_data *pd)
 801 {
 802         int i;
 803         unsigned configured = 0;
 804
 805         dst->pd = pd;
 806         dst->master_netdev = dev;
 807         dst->cpu_switch = -1;
 808         dst->cpu_port = -1;
 809
 810         for (i = 0; i < pd->nr_chips; i++) {
 811                 struct dsa_switch *ds;
 812
 813                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 814                 if (IS_ERR(ds)) {
 815                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 816                                    i, PTR_ERR(ds));
 817                         continue;
 818                 }
 819
 820                 dst->ds[i] = ds;
 821
 822                 ++configured;
 823         }
 824
 825         /*
 826          * If no switch was found, exit cleanly
 827          */
 828         if (!configured)
 829                 return -EPROBE_DEFER;
 830
 831         /*
 832          * If we use a tagging format that doesn't have an ethertype
 833          * field, make sure that all packets from this point on get
 834          * sent to the tag format's receive function.
 835          */
 836         wmb();
 837         dev->dsa_ptr = (void *)dst;
 838
 839         return 0;
 840 }
 841
 842 static int dsa_probe(struct platform_device *pdev)
 843 {
 844         struct dsa_platform_data *pd = pdev->dev.platform_data;
 845         struct net_device *dev;
 846         struct dsa_switch_tree *dst;
 847         int ret;
 848
 849         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 850                        dsa_driver_version);
 851
 852         if (pdev->dev.of_node) {
 853                 ret = dsa_of_probe(&pdev->dev);
 854                 if (ret)
 855                         return ret;
 856
 857                 pd = pdev->dev.platform_data;
 858         }
 859
 860         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 861                 return -EINVAL;
 862
 863         if (pd->of_netdev) {
 864                 dev = pd->of_netdev;
 865                 dev_hold(dev);
 866         } else {
 867                 dev = dev_to_net_device(pd->netdev);
 868         }
 869         if (dev == NULL) {
 870                 ret = -EPROBE_DEFER;
 871                 goto out;
 872         }
 873
 874         if (dev->dsa_ptr != NULL) {
 875                 dev_put(dev);
 876                 ret = -EEXIST;
 877                 goto out;
 878         }
 879
 880         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 881         if (dst == NULL) {
 882                 dev_put(dev);
 883                 ret = -ENOMEM;
 884                 goto out;
 885         }
 886
 887         platform_set_drvdata(pdev, dst);
 888
 889         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 890         if (ret) {
 891                 dev_put(dev);
 892                 goto out;
 893         }
 894
 895         return 0;
 896
 897 out:
 898         dsa_of_remove(&pdev->dev);
 899
 900         return ret;
 901 }
 902
 903 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 904 {
 905         int i;
 906
 907         dst->master_netdev->dsa_ptr = NULL;
 908
 909         /* If we used a tagging format that doesn't have an ethertype
 910          * field, make sure that all packets from this point get sent
 911          * without the tag and go through the regular receive path.
 912          */
 913         wmb();
 914
 915         for (i = 0; i < dst->pd->nr_chips; i++) {
 916                 struct dsa_switch *ds = dst->ds[i];
 917
 918                 if (ds)
 919                         dsa_switch_destroy(ds);
 920         }
 921
 922         dev_put(dst->master_netdev);
 923 }
 924
 925 static int dsa_remove(struct platform_device *pdev)
 926 {
 927         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 928
 929         dsa_remove_dst(dst);
 930         dsa_of_remove(&pdev->dev);
 931
 932         return 0;
 933 }
 934
 935 static void dsa_shutdown(struct platform_device *pdev)
 936 {
 937 }
 938
 939 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 940                           struct packet_type *pt, struct net_device *orig_dev)
 941 {
 942         struct dsa_switch_tree *dst = dev->dsa_ptr;
 943
 944         if (unlikely(dst == NULL)) {
 945                 kfree_skb(skb);
 946                 return 0;
 947         }
 948
 949         return dst->rcv(skb, dev, pt, orig_dev);
 950 }
 951
 952 static struct packet_type dsa_pack_type __read_mostly = {
 953         .type   = cpu_to_be16(ETH_P_XDSA),
 954         .func   = dsa_switch_rcv,
 955 };
 956
 957 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 958         .notifier_call  = dsa_slave_netdevice_event,
 959 };
 960
 961 #ifdef CONFIG_PM_SLEEP
 962 static int dsa_suspend(struct device *d)
 963 {
 964         struct platform_device *pdev = to_platform_device(d);
 965         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 966         int i, ret = 0;
 967
 968         for (i = 0; i < dst->pd->nr_chips; i++) {
 969                 struct dsa_switch *ds = dst->ds[i];
 970
 971                 if (ds != NULL)
 972                         ret = dsa_switch_suspend(ds);
 973         }
 974
 975         return ret;
 976 }
 977
 978 static int dsa_resume(struct device *d)
 979 {
 980         struct platform_device *pdev = to_platform_device(d);
 981         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 982         int i, ret = 0;
 983
 984         for (i = 0; i < dst->pd->nr_chips; i++) {
 985                 struct dsa_switch *ds = dst->ds[i];
 986
 987                 if (ds != NULL)
 988                         ret = dsa_switch_resume(ds);
 989         }
 990
 991         return ret;
 992 }
 993 #endif
 994
 995 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 996
 997 static const struct of_device_id dsa_of_match_table[] = {
 998         { .compatible = "brcm,bcm7445-switch-v4.0" },
 999         { .compatible = "marvell,dsa", },
1000         {}
1001 };
1002 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1003
1004 static struct platform_driver dsa_driver = {
1005         .probe          = dsa_probe,
1006         .remove         = dsa_remove,
1007         .shutdown       = dsa_shutdown,
1008         .driver = {
1009                 .name   = "dsa",
1010                 .of_match_table = dsa_of_match_table,
1011                 .pm     = &dsa_pm_ops,
1012         },
1013 };
1014
1015 static int __init dsa_init_module(void)
1016 {
1017         int rc;
1018
1019         register_netdevice_notifier(&dsa_netdevice_nb);
1020
1021         rc = platform_driver_register(&dsa_driver);
1022         if (rc)
1023                 return rc;
1024
1025         dev_add_pack(&dsa_pack_type);
1026
1027         return 0;
1028 }
1029 module_init(dsa_init_module);
1030
1031 static void __exit dsa_cleanup_module(void)
1032 {
1033         unregister_netdevice_notifier(&dsa_netdevice_nb);
1034         dev_remove_pack(&dsa_pack_type);
1035         platform_driver_unregister(&dsa_driver);
1036 }
1037 module_exit(dsa_cleanup_module);
1038
1039 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1040 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1041 MODULE_LICENSE("GPL");
1042 MODULE_ALIAS("platform:dsa");