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         if (!ds->slave_mii_bus && drv->phy_read) {
 344                 ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 345                 if (!ds->slave_mii_bus) {
 346                         ret = -ENOMEM;
 347                         goto out;
 348                 }
 349                 dsa_slave_mii_bus_init(ds);
 350
 351                 ret = mdiobus_register(ds->slave_mii_bus);
 352                 if (ret < 0)
 353                         goto out;
 354         }
 355
 356         /*
 357          * Create network devices for physical switch ports.
 358          */
 359         for (i = 0; i < DSA_MAX_PORTS; i++) {
 360                 ds->ports[i].dn = cd->port_dn[i];
 361
 362                 if (!(ds->enabled_port_mask & (1 << i)))
 363                         continue;
 364
 365                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 366                 if (ret < 0) {
 367                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 368                                    index, i, cd->port_names[i], ret);
 369                         ret = 0;
 370                 }
 371         }
 372
 373         /* Perform configuration of the CPU and DSA ports */
 374         ret = dsa_cpu_dsa_setups(ds, parent);
 375         if (ret < 0) {
 376                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 377                            index);
 378                 ret = 0;
 379         }
 380
 381 #ifdef CONFIG_NET_DSA_HWMON
 382         /* If the switch provides a temperature sensor,
 383          * register with hardware monitoring subsystem.
 384          * Treat registration error as non-fatal and ignore it.
 385          */
 386         if (drv->get_temp) {
 387                 const char *netname = netdev_name(dst->master_netdev);
 388                 char hname[IFNAMSIZ + 1];
 389                 int i, j;
 390
 391                 /* Create valid hwmon 'name' attribute */
 392                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 393                         if (isalnum(netname[i]))
 394                                 hname[j++] = netname[i];
 395                 }
 396                 hname[j] = '\0';
 397                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 398                           hname, index);
 399                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 400                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 401                 if (IS_ERR(ds->hwmon_dev))
 402                         ds->hwmon_dev = NULL;
 403         }
 404 #endif /* CONFIG_NET_DSA_HWMON */
 405
 406         return ret;
 407
 408 out:
 409         return ret;
 410 }
 411
 412 static struct dsa_switch *
 413 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 414                  struct device *parent, struct device *host_dev)
 415 {
 416         struct dsa_chip_data *cd = dst->pd->chip + index;
 417         struct dsa_switch_driver *drv;
 418         struct dsa_switch *ds;
 419         int ret;
 420         const char *name;
 421         void *priv;
 422
 423         /*
 424          * Probe for switch model.
 425          */
 426         drv = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 427         if (drv == NULL) {
 428                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 429                            index);
 430                 return ERR_PTR(-EINVAL);
 431         }
 432         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 433                     index, name);
 434
 435
 436         /*
 437          * Allocate and initialise switch state.
 438          */
 439         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 440         if (ds == NULL)
 441                 return ERR_PTR(-ENOMEM);
 442
 443         ds->dst = dst;
 444         ds->index = index;
 445         ds->cd = cd;
 446         ds->drv = drv;
 447         ds->priv = priv;
 448         ds->dev = parent;
 449
 450         ret = dsa_switch_setup_one(ds, parent);
 451         if (ret)
 452                 return ERR_PTR(ret);
 453
 454         return ds;
 455 }
 456
 457 void dsa_cpu_dsa_destroy(struct device_node *port_dn)
 458 {
 459         struct phy_device *phydev;
 460
 461         if (of_phy_is_fixed_link(port_dn)) {
 462                 phydev = of_phy_find_device(port_dn);
 463                 if (phydev) {
 464                         phy_device_free(phydev);
 465                         fixed_phy_unregister(phydev);
 466                 }
 467         }
 468 }
 469
 470 static void dsa_switch_destroy(struct dsa_switch *ds)
 471 {
 472         int port;
 473
 474 #ifdef CONFIG_NET_DSA_HWMON
 475         if (ds->hwmon_dev)
 476                 hwmon_device_unregister(ds->hwmon_dev);
 477 #endif
 478
 479         /* Destroy network devices for physical switch ports. */
 480         for (port = 0; port < DSA_MAX_PORTS; port++) {
 481                 if (!(ds->enabled_port_mask & (1 << port)))
 482                         continue;
 483
 484                 if (!ds->ports[port].netdev)
 485                         continue;
 486
 487                 dsa_slave_destroy(ds->ports[port].netdev);
 488         }
 489
 490         /* Disable configuration of the CPU and DSA ports */
 491         for (port = 0; port < DSA_MAX_PORTS; port++) {
 492                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 493                         continue;
 494                 dsa_cpu_dsa_destroy(ds->ports[port].dn);
 495         }
 496
 497         if (ds->slave_mii_bus && ds->drv->phy_read)
 498                 mdiobus_unregister(ds->slave_mii_bus);
 499 }
 500
 501 #ifdef CONFIG_PM_SLEEP
 502 static int dsa_switch_suspend(struct dsa_switch *ds)
 503 {
 504         int i, ret = 0;
 505
 506         /* Suspend slave network devices */
 507         for (i = 0; i < DSA_MAX_PORTS; i++) {
 508                 if (!dsa_is_port_initialized(ds, i))
 509                         continue;
 510
 511                 ret = dsa_slave_suspend(ds->ports[i].netdev);
 512                 if (ret)
 513                         return ret;
 514         }
 515
 516         if (ds->drv->suspend)
 517                 ret = ds->drv->suspend(ds);
 518
 519         return ret;
 520 }
 521
 522 static int dsa_switch_resume(struct dsa_switch *ds)
 523 {
 524         int i, ret = 0;
 525
 526         if (ds->drv->resume)
 527                 ret = ds->drv->resume(ds);
 528
 529         if (ret)
 530                 return ret;
 531
 532         /* Resume slave network devices */
 533         for (i = 0; i < DSA_MAX_PORTS; i++) {
 534                 if (!dsa_is_port_initialized(ds, i))
 535                         continue;
 536
 537                 ret = dsa_slave_resume(ds->ports[i].netdev);
 538                 if (ret)
 539                         return ret;
 540         }
 541
 542         return 0;
 543 }
 544 #endif
 545
 546 /* platform driver init and cleanup *****************************************/
 547 static int dev_is_class(struct device *dev, void *class)
 548 {
 549         if (dev->class != NULL && !strcmp(dev->class->name, class))
 550                 return 1;
 551
 552         return 0;
 553 }
 554
 555 static struct device *dev_find_class(struct device *parent, char *class)
 556 {
 557         if (dev_is_class(parent, class)) {
 558                 get_device(parent);
 559                 return parent;
 560         }
 561
 562         return device_find_child(parent, class, dev_is_class);
 563 }
 564
 565 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 566 {
 567         struct device *d;
 568
 569         d = dev_find_class(dev, "mdio_bus");
 570         if (d != NULL) {
 571                 struct mii_bus *bus;
 572
 573                 bus = to_mii_bus(d);
 574                 put_device(d);
 575
 576                 return bus;
 577         }
 578
 579         return NULL;
 580 }
 581 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 582
 583 static struct net_device *dev_to_net_device(struct device *dev)
 584 {
 585         struct device *d;
 586
 587         d = dev_find_class(dev, "net");
 588         if (d != NULL) {
 589                 struct net_device *nd;
 590
 591                 nd = to_net_dev(d);
 592                 dev_hold(nd);
 593                 put_device(d);
 594
 595                 return nd;
 596         }
 597
 598         return NULL;
 599 }
 600
 601 #ifdef CONFIG_OF
 602 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 603                                         struct dsa_chip_data *cd,
 604                                         int chip_index, int port_index,
 605                                         struct device_node *link)
 606 {
 607         const __be32 *reg;
 608         int link_sw_addr;
 609         struct device_node *parent_sw;
 610         int len;
 611
 612         parent_sw = of_get_parent(link);
 613         if (!parent_sw)
 614                 return -EINVAL;
 615
 616         reg = of_get_property(parent_sw, "reg", &len);
 617         if (!reg || (len != sizeof(*reg) * 2))
 618                 return -EINVAL;
 619
 620         /*
 621          * Get the destination switch number from the second field of its 'reg'
 622          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 623          */
 624         link_sw_addr = be32_to_cpup(reg + 1);
 625
 626         if (link_sw_addr >= pd->nr_chips)
 627                 return -EINVAL;
 628
 629         cd->rtable[link_sw_addr] = port_index;
 630
 631         return 0;
 632 }
 633
 634 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 635                               struct dsa_chip_data *cd,
 636                               int chip_index, int port_index,
 637                               struct device_node *port,
 638                               const char *port_name)
 639 {
 640         struct device_node *link;
 641         int link_index;
 642         int ret;
 643
 644         for (link_index = 0;; link_index++) {
 645                 link = of_parse_phandle(port, "link", link_index);
 646                 if (!link)
 647                         break;
 648
 649                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 650                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 651                                                          port_index, link);
 652                         if (ret)
 653                                 return ret;
 654                 }
 655         }
 656         return 0;
 657 }
 658
 659 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 660 {
 661         int i;
 662         int port_index;
 663
 664         for (i = 0; i < pd->nr_chips; i++) {
 665                 port_index = 0;
 666                 while (port_index < DSA_MAX_PORTS) {
 667                         kfree(pd->chip[i].port_names[port_index]);
 668                         port_index++;
 669                 }
 670
 671                 /* Drop our reference to the MDIO bus device */
 672                 if (pd->chip[i].host_dev)
 673                         put_device(pd->chip[i].host_dev);
 674         }
 675         kfree(pd->chip);
 676 }
 677
 678 static int dsa_of_probe(struct device *dev)
 679 {
 680         struct device_node *np = dev->of_node;
 681         struct device_node *child, *mdio, *ethernet, *port;
 682         struct mii_bus *mdio_bus, *mdio_bus_switch;
 683         struct net_device *ethernet_dev;
 684         struct dsa_platform_data *pd;
 685         struct dsa_chip_data *cd;
 686         const char *port_name;
 687         int chip_index, port_index;
 688         const unsigned int *sw_addr, *port_reg;
 689         u32 eeprom_len;
 690         int ret;
 691
 692         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 693         if (!mdio)
 694                 return -EINVAL;
 695
 696         mdio_bus = of_mdio_find_bus(mdio);
 697         if (!mdio_bus)
 698                 return -EPROBE_DEFER;
 699
 700         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 701         if (!ethernet) {
 702                 ret = -EINVAL;
 703                 goto out_put_mdio;
 704         }
 705
 706         ethernet_dev = of_find_net_device_by_node(ethernet);
 707         if (!ethernet_dev) {
 708                 ret = -EPROBE_DEFER;
 709                 goto out_put_mdio;
 710         }
 711
 712         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 713         if (!pd) {
 714                 ret = -ENOMEM;
 715                 goto out_put_ethernet;
 716         }
 717
 718         dev->platform_data = pd;
 719         pd->of_netdev = ethernet_dev;
 720         pd->nr_chips = of_get_available_child_count(np);
 721         if (pd->nr_chips > DSA_MAX_SWITCHES)
 722                 pd->nr_chips = DSA_MAX_SWITCHES;
 723
 724         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 725                            GFP_KERNEL);
 726         if (!pd->chip) {
 727                 ret = -ENOMEM;
 728                 goto out_free;
 729         }
 730
 731         chip_index = -1;
 732         for_each_available_child_of_node(np, child) {
 733                 chip_index++;
 734                 cd = &pd->chip[chip_index];
 735
 736                 cd->of_node = child;
 737
 738                 /* When assigning the host device, increment its refcount */
 739                 cd->host_dev = get_device(&mdio_bus->dev);
 740
 741                 sw_addr = of_get_property(child, "reg", NULL);
 742                 if (!sw_addr)
 743                         continue;
 744
 745                 cd->sw_addr = be32_to_cpup(sw_addr);
 746                 if (cd->sw_addr >= PHY_MAX_ADDR)
 747                         continue;
 748
 749                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 750                         cd->eeprom_len = eeprom_len;
 751
 752                 mdio = of_parse_phandle(child, "mii-bus", 0);
 753                 if (mdio) {
 754                         mdio_bus_switch = of_mdio_find_bus(mdio);
 755                         if (!mdio_bus_switch) {
 756                                 ret = -EPROBE_DEFER;
 757                                 goto out_free_chip;
 758                         }
 759
 760                         /* Drop the mdio_bus device ref, replacing the host
 761                          * device with the mdio_bus_switch device, keeping
 762                          * the refcount from of_mdio_find_bus() above.
 763                          */
 764                         put_device(cd->host_dev);
 765                         cd->host_dev = &mdio_bus_switch->dev;
 766                 }
 767
 768                 for_each_available_child_of_node(child, port) {
 769                         port_reg = of_get_property(port, "reg", NULL);
 770                         if (!port_reg)
 771                                 continue;
 772
 773                         port_index = be32_to_cpup(port_reg);
 774                         if (port_index >= DSA_MAX_PORTS)
 775                                 break;
 776
 777                         port_name = of_get_property(port, "label", NULL);
 778                         if (!port_name)
 779                                 continue;
 780
 781                         cd->port_dn[port_index] = port;
 782
 783                         cd->port_names[port_index] = kstrdup(port_name,
 784                                         GFP_KERNEL);
 785                         if (!cd->port_names[port_index]) {
 786                                 ret = -ENOMEM;
 787                                 goto out_free_chip;
 788                         }
 789
 790                         ret = dsa_of_probe_links(pd, cd, chip_index,
 791                                                  port_index, port, port_name);
 792                         if (ret)
 793                                 goto out_free_chip;
 794
 795                 }
 796         }
 797
 798         /* The individual chips hold their own refcount on the mdio bus,
 799          * so drop ours */
 800         put_device(&mdio_bus->dev);
 801
 802         return 0;
 803
 804 out_free_chip:
 805         dsa_of_free_platform_data(pd);
 806 out_free:
 807         kfree(pd);
 808         dev->platform_data = NULL;
 809 out_put_ethernet:
 810         put_device(&ethernet_dev->dev);
 811 out_put_mdio:
 812         put_device(&mdio_bus->dev);
 813         return ret;
 814 }
 815
 816 static void dsa_of_remove(struct device *dev)
 817 {
 818         struct dsa_platform_data *pd = dev->platform_data;
 819
 820         if (!dev->of_node)
 821                 return;
 822
 823         dsa_of_free_platform_data(pd);
 824         put_device(&pd->of_netdev->dev);
 825         kfree(pd);
 826 }
 827 #else
 828 static inline int dsa_of_probe(struct device *dev)
 829 {
 830         return 0;
 831 }
 832
 833 static inline void dsa_of_remove(struct device *dev)
 834 {
 835 }
 836 #endif
 837
 838 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 839                          struct device *parent, struct dsa_platform_data *pd)
 840 {
 841         int i;
 842         unsigned configured = 0;
 843
 844         dst->pd = pd;
 845         dst->master_netdev = dev;
 846         dst->cpu_switch = -1;
 847         dst->cpu_port = -1;
 848
 849         for (i = 0; i < pd->nr_chips; i++) {
 850                 struct dsa_switch *ds;
 851
 852                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 853                 if (IS_ERR(ds)) {
 854                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 855                                    i, PTR_ERR(ds));
 856                         continue;
 857                 }
 858
 859                 dst->ds[i] = ds;
 860
 861                 ++configured;
 862         }
 863
 864         /*
 865          * If no switch was found, exit cleanly
 866          */
 867         if (!configured)
 868                 return -EPROBE_DEFER;
 869
 870         /*
 871          * If we use a tagging format that doesn't have an ethertype
 872          * field, make sure that all packets from this point on get
 873          * sent to the tag format's receive function.
 874          */
 875         wmb();
 876         dev->dsa_ptr = (void *)dst;
 877
 878         return 0;
 879 }
 880
 881 static int dsa_probe(struct platform_device *pdev)
 882 {
 883         struct dsa_platform_data *pd = pdev->dev.platform_data;
 884         struct net_device *dev;
 885         struct dsa_switch_tree *dst;
 886         int ret;
 887
 888         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 889                        dsa_driver_version);
 890
 891         if (pdev->dev.of_node) {
 892                 ret = dsa_of_probe(&pdev->dev);
 893                 if (ret)
 894                         return ret;
 895
 896                 pd = pdev->dev.platform_data;
 897         }
 898
 899         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 900                 return -EINVAL;
 901
 902         if (pd->of_netdev) {
 903                 dev = pd->of_netdev;
 904                 dev_hold(dev);
 905         } else {
 906                 dev = dev_to_net_device(pd->netdev);
 907         }
 908         if (dev == NULL) {
 909                 ret = -EPROBE_DEFER;
 910                 goto out;
 911         }
 912
 913         if (dev->dsa_ptr != NULL) {
 914                 dev_put(dev);
 915                 ret = -EEXIST;
 916                 goto out;
 917         }
 918
 919         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 920         if (dst == NULL) {
 921                 dev_put(dev);
 922                 ret = -ENOMEM;
 923                 goto out;
 924         }
 925
 926         platform_set_drvdata(pdev, dst);
 927
 928         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 929         if (ret) {
 930                 dev_put(dev);
 931                 goto out;
 932         }
 933
 934         return 0;
 935
 936 out:
 937         dsa_of_remove(&pdev->dev);
 938
 939         return ret;
 940 }
 941
 942 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 943 {
 944         int i;
 945
 946         dst->master_netdev->dsa_ptr = NULL;
 947
 948         /* If we used a tagging format that doesn't have an ethertype
 949          * field, make sure that all packets from this point get sent
 950          * without the tag and go through the regular receive path.
 951          */
 952         wmb();
 953
 954         for (i = 0; i < dst->pd->nr_chips; i++) {
 955                 struct dsa_switch *ds = dst->ds[i];
 956
 957                 if (ds)
 958                         dsa_switch_destroy(ds);
 959         }
 960
 961         dev_put(dst->master_netdev);
 962 }
 963
 964 static int dsa_remove(struct platform_device *pdev)
 965 {
 966         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 967
 968         dsa_remove_dst(dst);
 969         dsa_of_remove(&pdev->dev);
 970
 971         return 0;
 972 }
 973
 974 static void dsa_shutdown(struct platform_device *pdev)
 975 {
 976 }
 977
 978 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 979                           struct packet_type *pt, struct net_device *orig_dev)
 980 {
 981         struct dsa_switch_tree *dst = dev->dsa_ptr;
 982
 983         if (unlikely(dst == NULL)) {
 984                 kfree_skb(skb);
 985                 return 0;
 986         }
 987
 988         return dst->rcv(skb, dev, pt, orig_dev);
 989 }
 990
 991 static struct packet_type dsa_pack_type __read_mostly = {
 992         .type   = cpu_to_be16(ETH_P_XDSA),
 993         .func   = dsa_switch_rcv,
 994 };
 995
 996 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 997         .notifier_call  = dsa_slave_netdevice_event,
 998 };
 999
1000 #ifdef CONFIG_PM_SLEEP
1001 static int dsa_suspend(struct device *d)
1002 {
1003         struct platform_device *pdev = to_platform_device(d);
1004         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1005         int i, ret = 0;
1006
1007         for (i = 0; i < dst->pd->nr_chips; i++) {
1008                 struct dsa_switch *ds = dst->ds[i];
1009
1010                 if (ds != NULL)
1011                         ret = dsa_switch_suspend(ds);
1012         }
1013
1014         return ret;
1015 }
1016
1017 static int dsa_resume(struct device *d)
1018 {
1019         struct platform_device *pdev = to_platform_device(d);
1020         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1021         int i, ret = 0;
1022
1023         for (i = 0; i < dst->pd->nr_chips; i++) {
1024                 struct dsa_switch *ds = dst->ds[i];
1025
1026                 if (ds != NULL)
1027                         ret = dsa_switch_resume(ds);
1028         }
1029
1030         return ret;
1031 }
1032 #endif
1033
1034 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1035
1036 static const struct of_device_id dsa_of_match_table[] = {
1037         { .compatible = "brcm,bcm7445-switch-v4.0" },
1038         { .compatible = "marvell,dsa", },
1039         {}
1040 };
1041 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1042
1043 static struct platform_driver dsa_driver = {
1044         .probe          = dsa_probe,
1045         .remove         = dsa_remove,
1046         .shutdown       = dsa_shutdown,
1047         .driver = {
1048                 .name   = "dsa",
1049                 .of_match_table = dsa_of_match_table,
1050                 .pm     = &dsa_pm_ops,
1051         },
1052 };
1053
1054 static int __init dsa_init_module(void)
1055 {
1056         int rc;
1057
1058         register_netdevice_notifier(&dsa_netdevice_nb);
1059
1060         rc = platform_driver_register(&dsa_driver);
1061         if (rc)
1062                 return rc;
1063
1064         dev_add_pack(&dsa_pack_type);
1065
1066         return 0;
1067 }
1068 module_init(dsa_init_module);
1069
1070 static void __exit dsa_cleanup_module(void)
1071 {
1072         unregister_netdevice_notifier(&dsa_netdevice_nb);
1073         dev_remove_pack(&dsa_pack_type);
1074         platform_driver_unregister(&dsa_driver);
1075 }
1076 module_exit(dsa_cleanup_module);
1077
1078 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1079 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1080 MODULE_LICENSE("GPL");
1081 MODULE_ALIAS("platform:dsa");