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         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 301
 302         /*
 303          * Do basic register setup.
 304          */
 305         ret = drv->setup(ds);
 306         if (ret < 0)
 307                 goto out;
 308
 309         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 310         if (ret < 0)
 311                 goto out;
 312
 313         ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 314         if (ds->slave_mii_bus == NULL) {
 315                 ret = -ENOMEM;
 316                 goto out;
 317         }
 318         dsa_slave_mii_bus_init(ds);
 319
 320         ret = mdiobus_register(ds->slave_mii_bus);
 321         if (ret < 0)
 322                 goto out;
 323
 324
 325         /*
 326          * Create network devices for physical switch ports.
 327          */
 328         for (i = 0; i < DSA_MAX_PORTS; i++) {
 329                 ds->ports[i].dn = cd->port_dn[i];
 330
 331                 if (!(ds->enabled_port_mask & (1 << i)))
 332                         continue;
 333
 334                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 335                 if (ret < 0) {
 336                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 337                                    index, i, cd->port_names[i], ret);
 338                         ret = 0;
 339                 }
 340         }
 341
 342         /* Perform configuration of the CPU and DSA ports */
 343         ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
 344         if (ret < 0) {
 345                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 346                            index);
 347                 ret = 0;
 348         }
 349
 350 #ifdef CONFIG_NET_DSA_HWMON
 351         /* If the switch provides a temperature sensor,
 352          * register with hardware monitoring subsystem.
 353          * Treat registration error as non-fatal and ignore it.
 354          */
 355         if (drv->get_temp) {
 356                 const char *netname = netdev_name(dst->master_netdev);
 357                 char hname[IFNAMSIZ + 1];
 358                 int i, j;
 359
 360                 /* Create valid hwmon 'name' attribute */
 361                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 362                         if (isalnum(netname[i]))
 363                                 hname[j++] = netname[i];
 364                 }
 365                 hname[j] = '\0';
 366                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 367                           hname, index);
 368                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 369                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 370                 if (IS_ERR(ds->hwmon_dev))
 371                         ds->hwmon_dev = NULL;
 372         }
 373 #endif /* CONFIG_NET_DSA_HWMON */
 374
 375         return ret;
 376
 377 out:
 378         return ret;
 379 }
 380
 381 static struct dsa_switch *
 382 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 383                  struct device *parent, struct device *host_dev)
 384 {
 385         struct dsa_chip_data *cd = dst->pd->chip + index;
 386         struct dsa_switch_driver *drv;
 387         struct dsa_switch *ds;
 388         int ret;
 389         const char *name;
 390         void *priv;
 391
 392         /*
 393          * Probe for switch model.
 394          */
 395         drv = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 396         if (drv == NULL) {
 397                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 398                            index);
 399                 return ERR_PTR(-EINVAL);
 400         }
 401         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 402                     index, name);
 403
 404
 405         /*
 406          * Allocate and initialise switch state.
 407          */
 408         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 409         if (ds == NULL)
 410                 return ERR_PTR(-ENOMEM);
 411
 412         ds->dst = dst;
 413         ds->index = index;
 414         ds->cd = cd;
 415         ds->drv = drv;
 416         ds->priv = priv;
 417         ds->dev = parent;
 418
 419         ret = dsa_switch_setup_one(ds, parent);
 420         if (ret)
 421                 return ERR_PTR(ret);
 422
 423         return ds;
 424 }
 425
 426 static void dsa_switch_destroy(struct dsa_switch *ds)
 427 {
 428         struct device_node *port_dn;
 429         struct phy_device *phydev;
 430         int port;
 431
 432 #ifdef CONFIG_NET_DSA_HWMON
 433         if (ds->hwmon_dev)
 434                 hwmon_device_unregister(ds->hwmon_dev);
 435 #endif
 436
 437         /* Destroy network devices for physical switch ports. */
 438         for (port = 0; port < DSA_MAX_PORTS; port++) {
 439                 if (!(ds->enabled_port_mask & (1 << port)))
 440                         continue;
 441
 442                 if (!ds->ports[port].netdev)
 443                         continue;
 444
 445                 dsa_slave_destroy(ds->ports[port].netdev);
 446         }
 447
 448         /* Remove any fixed link PHYs */
 449         for (port = 0; port < DSA_MAX_PORTS; port++) {
 450                 port_dn = ds->ports[port].dn;
 451                 if (of_phy_is_fixed_link(port_dn)) {
 452                         phydev = of_phy_find_device(port_dn);
 453                         if (phydev) {
 454                                 phy_device_free(phydev);
 455                                 of_node_put(port_dn);
 456                                 fixed_phy_unregister(phydev);
 457                         }
 458                 }
 459         }
 460
 461         mdiobus_unregister(ds->slave_mii_bus);
 462 }
 463
 464 #ifdef CONFIG_PM_SLEEP
 465 static int dsa_switch_suspend(struct dsa_switch *ds)
 466 {
 467         int i, ret = 0;
 468
 469         /* Suspend slave network devices */
 470         for (i = 0; i < DSA_MAX_PORTS; i++) {
 471                 if (!dsa_is_port_initialized(ds, i))
 472                         continue;
 473
 474                 ret = dsa_slave_suspend(ds->ports[i].netdev);
 475                 if (ret)
 476                         return ret;
 477         }
 478
 479         if (ds->drv->suspend)
 480                 ret = ds->drv->suspend(ds);
 481
 482         return ret;
 483 }
 484
 485 static int dsa_switch_resume(struct dsa_switch *ds)
 486 {
 487         int i, ret = 0;
 488
 489         if (ds->drv->resume)
 490                 ret = ds->drv->resume(ds);
 491
 492         if (ret)
 493                 return ret;
 494
 495         /* Resume slave network devices */
 496         for (i = 0; i < DSA_MAX_PORTS; i++) {
 497                 if (!dsa_is_port_initialized(ds, i))
 498                         continue;
 499
 500                 ret = dsa_slave_resume(ds->ports[i].netdev);
 501                 if (ret)
 502                         return ret;
 503         }
 504
 505         return 0;
 506 }
 507 #endif
 508
 509 /* platform driver init and cleanup *****************************************/
 510 static int dev_is_class(struct device *dev, void *class)
 511 {
 512         if (dev->class != NULL && !strcmp(dev->class->name, class))
 513                 return 1;
 514
 515         return 0;
 516 }
 517
 518 static struct device *dev_find_class(struct device *parent, char *class)
 519 {
 520         if (dev_is_class(parent, class)) {
 521                 get_device(parent);
 522                 return parent;
 523         }
 524
 525         return device_find_child(parent, class, dev_is_class);
 526 }
 527
 528 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 529 {
 530         struct device *d;
 531
 532         d = dev_find_class(dev, "mdio_bus");
 533         if (d != NULL) {
 534                 struct mii_bus *bus;
 535
 536                 bus = to_mii_bus(d);
 537                 put_device(d);
 538
 539                 return bus;
 540         }
 541
 542         return NULL;
 543 }
 544 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 545
 546 static struct net_device *dev_to_net_device(struct device *dev)
 547 {
 548         struct device *d;
 549
 550         d = dev_find_class(dev, "net");
 551         if (d != NULL) {
 552                 struct net_device *nd;
 553
 554                 nd = to_net_dev(d);
 555                 dev_hold(nd);
 556                 put_device(d);
 557
 558                 return nd;
 559         }
 560
 561         return NULL;
 562 }
 563
 564 #ifdef CONFIG_OF
 565 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 566                                         struct dsa_chip_data *cd,
 567                                         int chip_index, int port_index,
 568                                         struct device_node *link)
 569 {
 570         const __be32 *reg;
 571         int link_sw_addr;
 572         struct device_node *parent_sw;
 573         int len;
 574
 575         parent_sw = of_get_parent(link);
 576         if (!parent_sw)
 577                 return -EINVAL;
 578
 579         reg = of_get_property(parent_sw, "reg", &len);
 580         if (!reg || (len != sizeof(*reg) * 2))
 581                 return -EINVAL;
 582
 583         /*
 584          * Get the destination switch number from the second field of its 'reg'
 585          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 586          */
 587         link_sw_addr = be32_to_cpup(reg + 1);
 588
 589         if (link_sw_addr >= pd->nr_chips)
 590                 return -EINVAL;
 591
 592         cd->rtable[link_sw_addr] = port_index;
 593
 594         return 0;
 595 }
 596
 597 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 598                               struct dsa_chip_data *cd,
 599                               int chip_index, int port_index,
 600                               struct device_node *port,
 601                               const char *port_name)
 602 {
 603         struct device_node *link;
 604         int link_index;
 605         int ret;
 606
 607         for (link_index = 0;; link_index++) {
 608                 link = of_parse_phandle(port, "link", link_index);
 609                 if (!link)
 610                         break;
 611
 612                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 613                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 614                                                          port_index, link);
 615                         if (ret)
 616                                 return ret;
 617                 }
 618         }
 619         return 0;
 620 }
 621
 622 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 623 {
 624         int i;
 625         int port_index;
 626
 627         for (i = 0; i < pd->nr_chips; i++) {
 628                 port_index = 0;
 629                 while (port_index < DSA_MAX_PORTS) {
 630                         kfree(pd->chip[i].port_names[port_index]);
 631                         port_index++;
 632                 }
 633
 634                 /* Drop our reference to the MDIO bus device */
 635                 if (pd->chip[i].host_dev)
 636                         put_device(pd->chip[i].host_dev);
 637         }
 638         kfree(pd->chip);
 639 }
 640
 641 static int dsa_of_probe(struct device *dev)
 642 {
 643         struct device_node *np = dev->of_node;
 644         struct device_node *child, *mdio, *ethernet, *port;
 645         struct mii_bus *mdio_bus, *mdio_bus_switch;
 646         struct net_device *ethernet_dev;
 647         struct dsa_platform_data *pd;
 648         struct dsa_chip_data *cd;
 649         const char *port_name;
 650         int chip_index, port_index;
 651         const unsigned int *sw_addr, *port_reg;
 652         u32 eeprom_len;
 653         int ret;
 654
 655         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 656         if (!mdio)
 657                 return -EINVAL;
 658
 659         mdio_bus = of_mdio_find_bus(mdio);
 660         if (!mdio_bus)
 661                 return -EPROBE_DEFER;
 662
 663         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 664         if (!ethernet) {
 665                 ret = -EINVAL;
 666                 goto out_put_mdio;
 667         }
 668
 669         ethernet_dev = of_find_net_device_by_node(ethernet);
 670         if (!ethernet_dev) {
 671                 ret = -EPROBE_DEFER;
 672                 goto out_put_mdio;
 673         }
 674
 675         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 676         if (!pd) {
 677                 ret = -ENOMEM;
 678                 goto out_put_ethernet;
 679         }
 680
 681         dev->platform_data = pd;
 682         pd->of_netdev = ethernet_dev;
 683         pd->nr_chips = of_get_available_child_count(np);
 684         if (pd->nr_chips > DSA_MAX_SWITCHES)
 685                 pd->nr_chips = DSA_MAX_SWITCHES;
 686
 687         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 688                            GFP_KERNEL);
 689         if (!pd->chip) {
 690                 ret = -ENOMEM;
 691                 goto out_free;
 692         }
 693
 694         chip_index = -1;
 695         for_each_available_child_of_node(np, child) {
 696                 chip_index++;
 697                 cd = &pd->chip[chip_index];
 698
 699                 cd->of_node = child;
 700
 701                 /* When assigning the host device, increment its refcount */
 702                 cd->host_dev = get_device(&mdio_bus->dev);
 703
 704                 sw_addr = of_get_property(child, "reg", NULL);
 705                 if (!sw_addr)
 706                         continue;
 707
 708                 cd->sw_addr = be32_to_cpup(sw_addr);
 709                 if (cd->sw_addr >= PHY_MAX_ADDR)
 710                         continue;
 711
 712                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 713                         cd->eeprom_len = eeprom_len;
 714
 715                 mdio = of_parse_phandle(child, "mii-bus", 0);
 716                 if (mdio) {
 717                         mdio_bus_switch = of_mdio_find_bus(mdio);
 718                         if (!mdio_bus_switch) {
 719                                 ret = -EPROBE_DEFER;
 720                                 goto out_free_chip;
 721                         }
 722
 723                         /* Drop the mdio_bus device ref, replacing the host
 724                          * device with the mdio_bus_switch device, keeping
 725                          * the refcount from of_mdio_find_bus() above.
 726                          */
 727                         put_device(cd->host_dev);
 728                         cd->host_dev = &mdio_bus_switch->dev;
 729                 }
 730
 731                 for_each_available_child_of_node(child, port) {
 732                         port_reg = of_get_property(port, "reg", NULL);
 733                         if (!port_reg)
 734                                 continue;
 735
 736                         port_index = be32_to_cpup(port_reg);
 737                         if (port_index >= DSA_MAX_PORTS)
 738                                 break;
 739
 740                         port_name = of_get_property(port, "label", NULL);
 741                         if (!port_name)
 742                                 continue;
 743
 744                         cd->port_dn[port_index] = port;
 745
 746                         cd->port_names[port_index] = kstrdup(port_name,
 747                                         GFP_KERNEL);
 748                         if (!cd->port_names[port_index]) {
 749                                 ret = -ENOMEM;
 750                                 goto out_free_chip;
 751                         }
 752
 753                         ret = dsa_of_probe_links(pd, cd, chip_index,
 754                                                  port_index, port, port_name);
 755                         if (ret)
 756                                 goto out_free_chip;
 757
 758                 }
 759         }
 760
 761         /* The individual chips hold their own refcount on the mdio bus,
 762          * so drop ours */
 763         put_device(&mdio_bus->dev);
 764
 765         return 0;
 766
 767 out_free_chip:
 768         dsa_of_free_platform_data(pd);
 769 out_free:
 770         kfree(pd);
 771         dev->platform_data = NULL;
 772 out_put_ethernet:
 773         put_device(&ethernet_dev->dev);
 774 out_put_mdio:
 775         put_device(&mdio_bus->dev);
 776         return ret;
 777 }
 778
 779 static void dsa_of_remove(struct device *dev)
 780 {
 781         struct dsa_platform_data *pd = dev->platform_data;
 782
 783         if (!dev->of_node)
 784                 return;
 785
 786         dsa_of_free_platform_data(pd);
 787         put_device(&pd->of_netdev->dev);
 788         kfree(pd);
 789 }
 790 #else
 791 static inline int dsa_of_probe(struct device *dev)
 792 {
 793         return 0;
 794 }
 795
 796 static inline void dsa_of_remove(struct device *dev)
 797 {
 798 }
 799 #endif
 800
 801 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 802                          struct device *parent, struct dsa_platform_data *pd)
 803 {
 804         int i;
 805         unsigned configured = 0;
 806
 807         dst->pd = pd;
 808         dst->master_netdev = dev;
 809         dst->cpu_switch = -1;
 810         dst->cpu_port = -1;
 811
 812         for (i = 0; i < pd->nr_chips; i++) {
 813                 struct dsa_switch *ds;
 814
 815                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 816                 if (IS_ERR(ds)) {
 817                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 818                                    i, PTR_ERR(ds));
 819                         continue;
 820                 }
 821
 822                 dst->ds[i] = ds;
 823
 824                 ++configured;
 825         }
 826
 827         /*
 828          * If no switch was found, exit cleanly
 829          */
 830         if (!configured)
 831                 return -EPROBE_DEFER;
 832
 833         /*
 834          * If we use a tagging format that doesn't have an ethertype
 835          * field, make sure that all packets from this point on get
 836          * sent to the tag format's receive function.
 837          */
 838         wmb();
 839         dev->dsa_ptr = (void *)dst;
 840
 841         return 0;
 842 }
 843
 844 static int dsa_probe(struct platform_device *pdev)
 845 {
 846         struct dsa_platform_data *pd = pdev->dev.platform_data;
 847         struct net_device *dev;
 848         struct dsa_switch_tree *dst;
 849         int ret;
 850
 851         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 852                        dsa_driver_version);
 853
 854         if (pdev->dev.of_node) {
 855                 ret = dsa_of_probe(&pdev->dev);
 856                 if (ret)
 857                         return ret;
 858
 859                 pd = pdev->dev.platform_data;
 860         }
 861
 862         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 863                 return -EINVAL;
 864
 865         if (pd->of_netdev) {
 866                 dev = pd->of_netdev;
 867                 dev_hold(dev);
 868         } else {
 869                 dev = dev_to_net_device(pd->netdev);
 870         }
 871         if (dev == NULL) {
 872                 ret = -EPROBE_DEFER;
 873                 goto out;
 874         }
 875
 876         if (dev->dsa_ptr != NULL) {
 877                 dev_put(dev);
 878                 ret = -EEXIST;
 879                 goto out;
 880         }
 881
 882         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 883         if (dst == NULL) {
 884                 dev_put(dev);
 885                 ret = -ENOMEM;
 886                 goto out;
 887         }
 888
 889         platform_set_drvdata(pdev, dst);
 890
 891         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 892         if (ret) {
 893                 dev_put(dev);
 894                 goto out;
 895         }
 896
 897         return 0;
 898
 899 out:
 900         dsa_of_remove(&pdev->dev);
 901
 902         return ret;
 903 }
 904
 905 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 906 {
 907         int i;
 908
 909         dst->master_netdev->dsa_ptr = NULL;
 910
 911         /* If we used a tagging format that doesn't have an ethertype
 912          * field, make sure that all packets from this point get sent
 913          * without the tag and go through the regular receive path.
 914          */
 915         wmb();
 916
 917         for (i = 0; i < dst->pd->nr_chips; i++) {
 918                 struct dsa_switch *ds = dst->ds[i];
 919
 920                 if (ds)
 921                         dsa_switch_destroy(ds);
 922         }
 923
 924         dev_put(dst->master_netdev);
 925 }
 926
 927 static int dsa_remove(struct platform_device *pdev)
 928 {
 929         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 930
 931         dsa_remove_dst(dst);
 932         dsa_of_remove(&pdev->dev);
 933
 934         return 0;
 935 }
 936
 937 static void dsa_shutdown(struct platform_device *pdev)
 938 {
 939 }
 940
 941 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 942                           struct packet_type *pt, struct net_device *orig_dev)
 943 {
 944         struct dsa_switch_tree *dst = dev->dsa_ptr;
 945
 946         if (unlikely(dst == NULL)) {
 947                 kfree_skb(skb);
 948                 return 0;
 949         }
 950
 951         return dst->rcv(skb, dev, pt, orig_dev);
 952 }
 953
 954 static struct packet_type dsa_pack_type __read_mostly = {
 955         .type   = cpu_to_be16(ETH_P_XDSA),
 956         .func   = dsa_switch_rcv,
 957 };
 958
 959 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 960         .notifier_call  = dsa_slave_netdevice_event,
 961 };
 962
 963 #ifdef CONFIG_PM_SLEEP
 964 static int dsa_suspend(struct device *d)
 965 {
 966         struct platform_device *pdev = to_platform_device(d);
 967         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 968         int i, ret = 0;
 969
 970         for (i = 0; i < dst->pd->nr_chips; i++) {
 971                 struct dsa_switch *ds = dst->ds[i];
 972
 973                 if (ds != NULL)
 974                         ret = dsa_switch_suspend(ds);
 975         }
 976
 977         return ret;
 978 }
 979
 980 static int dsa_resume(struct device *d)
 981 {
 982         struct platform_device *pdev = to_platform_device(d);
 983         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 984         int i, ret = 0;
 985
 986         for (i = 0; i < dst->pd->nr_chips; i++) {
 987                 struct dsa_switch *ds = dst->ds[i];
 988
 989                 if (ds != NULL)
 990                         ret = dsa_switch_resume(ds);
 991         }
 992
 993         return ret;
 994 }
 995 #endif
 996
 997 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 998
 999 static const struct of_device_id dsa_of_match_table[] = {
1000         { .compatible = "brcm,bcm7445-switch-v4.0" },
1001         { .compatible = "marvell,dsa", },
1002         {}
1003 };
1004 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1005
1006 static struct platform_driver dsa_driver = {
1007         .probe          = dsa_probe,
1008         .remove         = dsa_remove,
1009         .shutdown       = dsa_shutdown,
1010         .driver = {
1011                 .name   = "dsa",
1012                 .of_match_table = dsa_of_match_table,
1013                 .pm     = &dsa_pm_ops,
1014         },
1015 };
1016
1017 static int __init dsa_init_module(void)
1018 {
1019         int rc;
1020
1021         register_netdevice_notifier(&dsa_netdevice_nb);
1022
1023         rc = platform_driver_register(&dsa_driver);
1024         if (rc)
1025                 return rc;
1026
1027         dev_add_pack(&dsa_pack_type);
1028
1029         return 0;
1030 }
1031 module_init(dsa_init_module);
1032
1033 static void __exit dsa_cleanup_module(void)
1034 {
1035         unregister_netdevice_notifier(&dsa_netdevice_nb);
1036         dev_remove_pack(&dsa_pack_type);
1037         platform_driver_unregister(&dsa_driver);
1038 }
1039 module_exit(dsa_cleanup_module);
1040
1041 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1042 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1043 MODULE_LICENSE("GPL");
1044 MODULE_ALIAS("platform:dsa");