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/sysfs.h>
  25 #include "dsa_priv.h"
  26
  27 char dsa_driver_version[] = "0.1";
  28
  29
  30 /* switch driver registration ***********************************************/
  31 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  32 static LIST_HEAD(dsa_switch_drivers);
  33
  34 void register_switch_driver(struct dsa_switch_driver *drv)
  35 {
  36         mutex_lock(&dsa_switch_drivers_mutex);
  37         list_add_tail(&drv->list, &dsa_switch_drivers);
  38         mutex_unlock(&dsa_switch_drivers_mutex);
  39 }
  40 EXPORT_SYMBOL_GPL(register_switch_driver);
  41
  42 void unregister_switch_driver(struct dsa_switch_driver *drv)
  43 {
  44         mutex_lock(&dsa_switch_drivers_mutex);
  45         list_del_init(&drv->list);
  46         mutex_unlock(&dsa_switch_drivers_mutex);
  47 }
  48 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  49
  50 static struct dsa_switch_driver *
  51 dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
  52 {
  53         struct dsa_switch_driver *ret;
  54         struct list_head *list;
  55         char *name;
  56
  57         ret = NULL;
  58         name = NULL;
  59
  60         mutex_lock(&dsa_switch_drivers_mutex);
  61         list_for_each(list, &dsa_switch_drivers) {
  62                 struct dsa_switch_driver *drv;
  63
  64                 drv = list_entry(list, struct dsa_switch_driver, list);
  65
  66                 name = drv->probe(host_dev, sw_addr);
  67                 if (name != NULL) {
  68                         ret = drv;
  69                         break;
  70                 }
  71         }
  72         mutex_unlock(&dsa_switch_drivers_mutex);
  73
  74         *_name = name;
  75
  76         return ret;
  77 }
  78
  79 /* hwmon support ************************************************************/
  80
  81 #ifdef CONFIG_NET_DSA_HWMON
  82
  83 static ssize_t temp1_input_show(struct device *dev,
  84                                 struct device_attribute *attr, char *buf)
  85 {
  86         struct dsa_switch *ds = dev_get_drvdata(dev);
  87         int temp, ret;
  88
  89         ret = ds->drv->get_temp(ds, &temp);
  90         if (ret < 0)
  91                 return ret;
  92
  93         return sprintf(buf, "%d\n", temp * 1000);
  94 }
  95 static DEVICE_ATTR_RO(temp1_input);
  96
  97 static ssize_t temp1_max_show(struct device *dev,
  98                               struct device_attribute *attr, char *buf)
  99 {
 100         struct dsa_switch *ds = dev_get_drvdata(dev);
 101         int temp, ret;
 102
 103         ret = ds->drv->get_temp_limit(ds, &temp);
 104         if (ret < 0)
 105                 return ret;
 106
 107         return sprintf(buf, "%d\n", temp * 1000);
 108 }
 109
 110 static ssize_t temp1_max_store(struct device *dev,
 111                                struct device_attribute *attr, const char *buf,
 112                                size_t count)
 113 {
 114         struct dsa_switch *ds = dev_get_drvdata(dev);
 115         int temp, ret;
 116
 117         ret = kstrtoint(buf, 0, &temp);
 118         if (ret < 0)
 119                 return ret;
 120
 121         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 122         if (ret < 0)
 123                 return ret;
 124
 125         return count;
 126 }
 127 static DEVICE_ATTR_RW(temp1_max);
 128
 129 static ssize_t temp1_max_alarm_show(struct device *dev,
 130                                     struct device_attribute *attr, char *buf)
 131 {
 132         struct dsa_switch *ds = dev_get_drvdata(dev);
 133         bool alarm;
 134         int ret;
 135
 136         ret = ds->drv->get_temp_alarm(ds, &alarm);
 137         if (ret < 0)
 138                 return ret;
 139
 140         return sprintf(buf, "%d\n", alarm);
 141 }
 142 static DEVICE_ATTR_RO(temp1_max_alarm);
 143
 144 static struct attribute *dsa_hwmon_attrs[] = {
 145         &dev_attr_temp1_input.attr,     /* 0 */
 146         &dev_attr_temp1_max.attr,       /* 1 */
 147         &dev_attr_temp1_max_alarm.attr, /* 2 */
 148         NULL
 149 };
 150
 151 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 152                                        struct attribute *attr, int index)
 153 {
 154         struct device *dev = container_of(kobj, struct device, kobj);
 155         struct dsa_switch *ds = dev_get_drvdata(dev);
 156         struct dsa_switch_driver *drv = ds->drv;
 157         umode_t mode = attr->mode;
 158
 159         if (index == 1) {
 160                 if (!drv->get_temp_limit)
 161                         mode = 0;
 162                 else if (!drv->set_temp_limit)
 163                         mode &= ~S_IWUSR;
 164         } else if (index == 2 && !drv->get_temp_alarm) {
 165                 mode = 0;
 166         }
 167         return mode;
 168 }
 169
 170 static const struct attribute_group dsa_hwmon_group = {
 171         .attrs = dsa_hwmon_attrs,
 172         .is_visible = dsa_hwmon_attrs_visible,
 173 };
 174 __ATTRIBUTE_GROUPS(dsa_hwmon);
 175
 176 #endif /* CONFIG_NET_DSA_HWMON */
 177
 178 /* basic switch operations **************************************************/
 179 static int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct net_device *master)
 180 {
 181         struct dsa_chip_data *cd = ds->pd;
 182         struct device_node *port_dn;
 183         struct phy_device *phydev;
 184         int ret, port, mode;
 185
 186         for (port = 0; port < DSA_MAX_PORTS; port++) {
 187                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 188                         continue;
 189
 190                 port_dn = cd->port_dn[port];
 191                 if (of_phy_is_fixed_link(port_dn)) {
 192                         ret = of_phy_register_fixed_link(port_dn);
 193                         if (ret) {
 194                                 netdev_err(master,
 195                                            "failed to register fixed PHY\n");
 196                                 return ret;
 197                         }
 198                         phydev = of_phy_find_device(port_dn);
 199
 200                         mode = of_get_phy_mode(port_dn);
 201                         if (mode < 0)
 202                                 mode = PHY_INTERFACE_MODE_NA;
 203                         phydev->interface = mode;
 204
 205                         genphy_config_init(phydev);
 206                         genphy_read_status(phydev);
 207                         if (ds->drv->adjust_link)
 208                                 ds->drv->adjust_link(ds, port, phydev);
 209                 }
 210         }
 211         return 0;
 212 }
 213
 214 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 215 {
 216         struct dsa_switch_driver *drv = ds->drv;
 217         struct dsa_switch_tree *dst = ds->dst;
 218         struct dsa_chip_data *pd = ds->pd;
 219         bool valid_name_found = false;
 220         int index = ds->index;
 221         int i, ret;
 222
 223         /*
 224          * Validate supplied switch configuration.
 225          */
 226         for (i = 0; i < DSA_MAX_PORTS; i++) {
 227                 char *name;
 228
 229                 name = pd->port_names[i];
 230                 if (name == NULL)
 231                         continue;
 232
 233                 if (!strcmp(name, "cpu")) {
 234                         if (dst->cpu_switch != -1) {
 235                                 netdev_err(dst->master_netdev,
 236                                            "multiple cpu ports?!\n");
 237                                 ret = -EINVAL;
 238                                 goto out;
 239                         }
 240                         dst->cpu_switch = index;
 241                         dst->cpu_port = i;
 242                 } else if (!strcmp(name, "dsa")) {
 243                         ds->dsa_port_mask |= 1 << i;
 244                 } else {
 245                         ds->phys_port_mask |= 1 << i;
 246                 }
 247                 valid_name_found = true;
 248         }
 249
 250         if (!valid_name_found && i == DSA_MAX_PORTS) {
 251                 ret = -EINVAL;
 252                 goto out;
 253         }
 254
 255         /* Make the built-in MII bus mask match the number of ports,
 256          * switch drivers can override this later
 257          */
 258         ds->phys_mii_mask = ds->phys_port_mask;
 259
 260         /*
 261          * If the CPU connects to this switch, set the switch tree
 262          * tagging protocol to the preferred tagging format of this
 263          * switch.
 264          */
 265         if (dst->cpu_switch == index) {
 266                 switch (ds->tag_protocol) {
 267 #ifdef CONFIG_NET_DSA_TAG_DSA
 268                 case DSA_TAG_PROTO_DSA:
 269                         dst->rcv = dsa_netdev_ops.rcv;
 270                         break;
 271 #endif
 272 #ifdef CONFIG_NET_DSA_TAG_EDSA
 273                 case DSA_TAG_PROTO_EDSA:
 274                         dst->rcv = edsa_netdev_ops.rcv;
 275                         break;
 276 #endif
 277 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 278                 case DSA_TAG_PROTO_TRAILER:
 279                         dst->rcv = trailer_netdev_ops.rcv;
 280                         break;
 281 #endif
 282 #ifdef CONFIG_NET_DSA_TAG_BRCM
 283                 case DSA_TAG_PROTO_BRCM:
 284                         dst->rcv = brcm_netdev_ops.rcv;
 285                         break;
 286 #endif
 287                 case DSA_TAG_PROTO_NONE:
 288                         break;
 289                 default:
 290                         ret = -ENOPROTOOPT;
 291                         goto out;
 292                 }
 293
 294                 dst->tag_protocol = ds->tag_protocol;
 295         }
 296
 297         /*
 298          * Do basic register setup.
 299          */
 300         ret = drv->setup(ds);
 301         if (ret < 0)
 302                 goto out;
 303
 304         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 305         if (ret < 0)
 306                 goto out;
 307
 308         ds->slave_mii_bus = mdiobus_alloc();
 309         if (ds->slave_mii_bus == NULL) {
 310                 ret = -ENOMEM;
 311                 goto out;
 312         }
 313         dsa_slave_mii_bus_init(ds);
 314
 315         ret = mdiobus_register(ds->slave_mii_bus);
 316         if (ret < 0)
 317                 goto out_free;
 318
 319
 320         /*
 321          * Create network devices for physical switch ports.
 322          */
 323         for (i = 0; i < DSA_MAX_PORTS; i++) {
 324                 if (!(ds->phys_port_mask & (1 << i)))
 325                         continue;
 326
 327                 ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
 328                 if (ret < 0) {
 329                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s)\n",
 330                                    index, i, pd->port_names[i]);
 331                         ret = 0;
 332                 }
 333         }
 334
 335         /* Perform configuration of the CPU and DSA ports */
 336         ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
 337         if (ret < 0) {
 338                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 339                            index);
 340                 ret = 0;
 341         }
 342
 343 #ifdef CONFIG_NET_DSA_HWMON
 344         /* If the switch provides a temperature sensor,
 345          * register with hardware monitoring subsystem.
 346          * Treat registration error as non-fatal and ignore it.
 347          */
 348         if (drv->get_temp) {
 349                 const char *netname = netdev_name(dst->master_netdev);
 350                 char hname[IFNAMSIZ + 1];
 351                 int i, j;
 352
 353                 /* Create valid hwmon 'name' attribute */
 354                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 355                         if (isalnum(netname[i]))
 356                                 hname[j++] = netname[i];
 357                 }
 358                 hname[j] = '\0';
 359                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 360                           hname, index);
 361                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 362                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 363                 if (IS_ERR(ds->hwmon_dev))
 364                         ds->hwmon_dev = NULL;
 365         }
 366 #endif /* CONFIG_NET_DSA_HWMON */
 367
 368         return ret;
 369
 370 out_free:
 371         mdiobus_free(ds->slave_mii_bus);
 372 out:
 373         kfree(ds);
 374         return ret;
 375 }
 376
 377 static struct dsa_switch *
 378 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 379                  struct device *parent, struct device *host_dev)
 380 {
 381         struct dsa_chip_data *pd = dst->pd->chip + index;
 382         struct dsa_switch_driver *drv;
 383         struct dsa_switch *ds;
 384         int ret;
 385         char *name;
 386
 387         /*
 388          * Probe for switch model.
 389          */
 390         drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
 391         if (drv == NULL) {
 392                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 393                            index);
 394                 return ERR_PTR(-EINVAL);
 395         }
 396         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 397                     index, name);
 398
 399
 400         /*
 401          * Allocate and initialise switch state.
 402          */
 403         ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
 404         if (ds == NULL)
 405                 return ERR_PTR(-ENOMEM);
 406
 407         ds->dst = dst;
 408         ds->index = index;
 409         ds->pd = pd;
 410         ds->drv = drv;
 411         ds->tag_protocol = drv->tag_protocol;
 412         ds->master_dev = host_dev;
 413
 414         ret = dsa_switch_setup_one(ds, parent);
 415         if (ret)
 416                 return ERR_PTR(ret);
 417
 418         return ds;
 419 }
 420
 421 static void dsa_switch_destroy(struct dsa_switch *ds)
 422 {
 423 #ifdef CONFIG_NET_DSA_HWMON
 424         if (ds->hwmon_dev)
 425                 hwmon_device_unregister(ds->hwmon_dev);
 426 #endif
 427 }
 428
 429 #ifdef CONFIG_PM_SLEEP
 430 static int dsa_switch_suspend(struct dsa_switch *ds)
 431 {
 432         int i, ret = 0;
 433
 434         /* Suspend slave network devices */
 435         for (i = 0; i < DSA_MAX_PORTS; i++) {
 436                 if (!dsa_is_port_initialized(ds, i))
 437                         continue;
 438
 439                 ret = dsa_slave_suspend(ds->ports[i]);
 440                 if (ret)
 441                         return ret;
 442         }
 443
 444         if (ds->drv->suspend)
 445                 ret = ds->drv->suspend(ds);
 446
 447         return ret;
 448 }
 449
 450 static int dsa_switch_resume(struct dsa_switch *ds)
 451 {
 452         int i, ret = 0;
 453
 454         if (ds->drv->resume)
 455                 ret = ds->drv->resume(ds);
 456
 457         if (ret)
 458                 return ret;
 459
 460         /* Resume slave network devices */
 461         for (i = 0; i < DSA_MAX_PORTS; i++) {
 462                 if (!dsa_is_port_initialized(ds, i))
 463                         continue;
 464
 465                 ret = dsa_slave_resume(ds->ports[i]);
 466                 if (ret)
 467                         return ret;
 468         }
 469
 470         return 0;
 471 }
 472 #endif
 473
 474
 475 /* link polling *************************************************************/
 476 static void dsa_link_poll_work(struct work_struct *ugly)
 477 {
 478         struct dsa_switch_tree *dst;
 479         int i;
 480
 481         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
 482
 483         for (i = 0; i < dst->pd->nr_chips; i++) {
 484                 struct dsa_switch *ds = dst->ds[i];
 485
 486                 if (ds != NULL && ds->drv->poll_link != NULL)
 487                         ds->drv->poll_link(ds);
 488         }
 489
 490         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
 491 }
 492
 493 static void dsa_link_poll_timer(unsigned long _dst)
 494 {
 495         struct dsa_switch_tree *dst = (void *)_dst;
 496
 497         schedule_work(&dst->link_poll_work);
 498 }
 499
 500
 501 /* platform driver init and cleanup *****************************************/
 502 static int dev_is_class(struct device *dev, void *class)
 503 {
 504         if (dev->class != NULL && !strcmp(dev->class->name, class))
 505                 return 1;
 506
 507         return 0;
 508 }
 509
 510 static struct device *dev_find_class(struct device *parent, char *class)
 511 {
 512         if (dev_is_class(parent, class)) {
 513                 get_device(parent);
 514                 return parent;
 515         }
 516
 517         return device_find_child(parent, class, dev_is_class);
 518 }
 519
 520 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 521 {
 522         struct device *d;
 523
 524         d = dev_find_class(dev, "mdio_bus");
 525         if (d != NULL) {
 526                 struct mii_bus *bus;
 527
 528                 bus = to_mii_bus(d);
 529                 put_device(d);
 530
 531                 return bus;
 532         }
 533
 534         return NULL;
 535 }
 536 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 537
 538 static struct net_device *dev_to_net_device(struct device *dev)
 539 {
 540         struct device *d;
 541
 542         d = dev_find_class(dev, "net");
 543         if (d != NULL) {
 544                 struct net_device *nd;
 545
 546                 nd = to_net_dev(d);
 547                 dev_hold(nd);
 548                 put_device(d);
 549
 550                 return nd;
 551         }
 552
 553         return NULL;
 554 }
 555
 556 #ifdef CONFIG_OF
 557 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 558                                         struct dsa_chip_data *cd,
 559                                         int chip_index, int port_index,
 560                                         struct device_node *link)
 561 {
 562         const __be32 *reg;
 563         int link_sw_addr;
 564         struct device_node *parent_sw;
 565         int len;
 566
 567         parent_sw = of_get_parent(link);
 568         if (!parent_sw)
 569                 return -EINVAL;
 570
 571         reg = of_get_property(parent_sw, "reg", &len);
 572         if (!reg || (len != sizeof(*reg) * 2))
 573                 return -EINVAL;
 574
 575         /*
 576          * Get the destination switch number from the second field of its 'reg'
 577          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 578          */
 579         link_sw_addr = be32_to_cpup(reg + 1);
 580
 581         if (link_sw_addr >= pd->nr_chips)
 582                 return -EINVAL;
 583
 584         /* First time routing table allocation */
 585         if (!cd->rtable) {
 586                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
 587                                            GFP_KERNEL);
 588                 if (!cd->rtable)
 589                         return -ENOMEM;
 590
 591                 /* default to no valid uplink/downlink */
 592                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
 593         }
 594
 595         cd->rtable[link_sw_addr] = port_index;
 596
 597         return 0;
 598 }
 599
 600 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 601                               struct dsa_chip_data *cd,
 602                               int chip_index, int port_index,
 603                               struct device_node *port,
 604                               const char *port_name)
 605 {
 606         struct device_node *link;
 607         int link_index;
 608         int ret;
 609
 610         for (link_index = 0;; link_index++) {
 611                 link = of_parse_phandle(port, "link", link_index);
 612                 if (!link)
 613                         break;
 614
 615                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 616                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 617                                                          port_index, link);
 618                         if (ret)
 619                                 return ret;
 620                 }
 621         }
 622         return 0;
 623 }
 624
 625 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 626 {
 627         int i;
 628         int port_index;
 629
 630         for (i = 0; i < pd->nr_chips; i++) {
 631                 port_index = 0;
 632                 while (port_index < DSA_MAX_PORTS) {
 633                         kfree(pd->chip[i].port_names[port_index]);
 634                         port_index++;
 635                 }
 636                 kfree(pd->chip[i].rtable);
 637
 638                 /* Drop our reference to the MDIO bus device */
 639                 if (pd->chip[i].host_dev)
 640                         put_device(pd->chip[i].host_dev);
 641         }
 642         kfree(pd->chip);
 643 }
 644
 645 static int dsa_of_probe(struct device *dev)
 646 {
 647         struct device_node *np = dev->of_node;
 648         struct device_node *child, *mdio, *ethernet, *port;
 649         struct mii_bus *mdio_bus, *mdio_bus_switch;
 650         struct net_device *ethernet_dev;
 651         struct dsa_platform_data *pd;
 652         struct dsa_chip_data *cd;
 653         const char *port_name;
 654         int chip_index, port_index;
 655         const unsigned int *sw_addr, *port_reg;
 656         u32 eeprom_len;
 657         int ret;
 658
 659         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 660         if (!mdio)
 661                 return -EINVAL;
 662
 663         mdio_bus = of_mdio_find_bus(mdio);
 664         if (!mdio_bus)
 665                 return -EPROBE_DEFER;
 666
 667         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 668         if (!ethernet) {
 669                 ret = -EINVAL;
 670                 goto out_put_mdio;
 671         }
 672
 673         ethernet_dev = of_find_net_device_by_node(ethernet);
 674         if (!ethernet_dev) {
 675                 ret = -EPROBE_DEFER;
 676                 goto out_put_mdio;
 677         }
 678
 679         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 680         if (!pd) {
 681                 ret = -ENOMEM;
 682                 goto out_put_ethernet;
 683         }
 684
 685         dev->platform_data = pd;
 686         pd->of_netdev = ethernet_dev;
 687         pd->nr_chips = of_get_available_child_count(np);
 688         if (pd->nr_chips > DSA_MAX_SWITCHES)
 689                 pd->nr_chips = DSA_MAX_SWITCHES;
 690
 691         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 692                            GFP_KERNEL);
 693         if (!pd->chip) {
 694                 ret = -ENOMEM;
 695                 goto out_free;
 696         }
 697
 698         chip_index = -1;
 699         for_each_available_child_of_node(np, child) {
 700                 chip_index++;
 701                 cd = &pd->chip[chip_index];
 702
 703                 cd->of_node = child;
 704
 705                 /* When assigning the host device, increment its refcount */
 706                 cd->host_dev = get_device(&mdio_bus->dev);
 707
 708                 sw_addr = of_get_property(child, "reg", NULL);
 709                 if (!sw_addr)
 710                         continue;
 711
 712                 cd->sw_addr = be32_to_cpup(sw_addr);
 713                 if (cd->sw_addr >= PHY_MAX_ADDR)
 714                         continue;
 715
 716                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 717                         cd->eeprom_len = eeprom_len;
 718
 719                 mdio = of_parse_phandle(child, "mii-bus", 0);
 720                 if (mdio) {
 721                         mdio_bus_switch = of_mdio_find_bus(mdio);
 722                         if (!mdio_bus_switch) {
 723                                 ret = -EPROBE_DEFER;
 724                                 goto out_free_chip;
 725                         }
 726
 727                         /* Drop the mdio_bus device ref, replacing the host
 728                          * device with the mdio_bus_switch device, keeping
 729                          * the refcount from of_mdio_find_bus() above.
 730                          */
 731                         put_device(cd->host_dev);
 732                         cd->host_dev = &mdio_bus_switch->dev;
 733                 }
 734
 735                 for_each_available_child_of_node(child, port) {
 736                         port_reg = of_get_property(port, "reg", NULL);
 737                         if (!port_reg)
 738                                 continue;
 739
 740                         port_index = be32_to_cpup(port_reg);
 741                         if (port_index >= DSA_MAX_PORTS)
 742                                 break;
 743
 744                         port_name = of_get_property(port, "label", NULL);
 745                         if (!port_name)
 746                                 continue;
 747
 748                         cd->port_dn[port_index] = port;
 749
 750                         cd->port_names[port_index] = kstrdup(port_name,
 751                                         GFP_KERNEL);
 752                         if (!cd->port_names[port_index]) {
 753                                 ret = -ENOMEM;
 754                                 goto out_free_chip;
 755                         }
 756
 757                         ret = dsa_of_probe_links(pd, cd, chip_index,
 758                                                  port_index, port, port_name);
 759                         if (ret)
 760                                 goto out_free_chip;
 761
 762                 }
 763         }
 764
 765         /* The individual chips hold their own refcount on the mdio bus,
 766          * so drop ours */
 767         put_device(&mdio_bus->dev);
 768
 769         return 0;
 770
 771 out_free_chip:
 772         dsa_of_free_platform_data(pd);
 773 out_free:
 774         kfree(pd);
 775         dev->platform_data = NULL;
 776 out_put_ethernet:
 777         put_device(&ethernet_dev->dev);
 778 out_put_mdio:
 779         put_device(&mdio_bus->dev);
 780         return ret;
 781 }
 782
 783 static void dsa_of_remove(struct device *dev)
 784 {
 785         struct dsa_platform_data *pd = dev->platform_data;
 786
 787         if (!dev->of_node)
 788                 return;
 789
 790         dsa_of_free_platform_data(pd);
 791         put_device(&pd->of_netdev->dev);
 792         kfree(pd);
 793 }
 794 #else
 795 static inline int dsa_of_probe(struct device *dev)
 796 {
 797         return 0;
 798 }
 799
 800 static inline void dsa_of_remove(struct device *dev)
 801 {
 802 }
 803 #endif
 804
 805 static void dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 806                           struct device *parent, struct dsa_platform_data *pd)
 807 {
 808         int i;
 809
 810         dst->pd = pd;
 811         dst->master_netdev = dev;
 812         dst->cpu_switch = -1;
 813         dst->cpu_port = -1;
 814
 815         for (i = 0; i < pd->nr_chips; i++) {
 816                 struct dsa_switch *ds;
 817
 818                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 819                 if (IS_ERR(ds)) {
 820                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 821                                    i, PTR_ERR(ds));
 822                         continue;
 823                 }
 824
 825                 dst->ds[i] = ds;
 826                 if (ds->drv->poll_link != NULL)
 827                         dst->link_poll_needed = 1;
 828         }
 829
 830         /*
 831          * If we use a tagging format that doesn't have an ethertype
 832          * field, make sure that all packets from this point on get
 833          * sent to the tag format's receive function.
 834          */
 835         wmb();
 836         dev->dsa_ptr = (void *)dst;
 837
 838         if (dst->link_poll_needed) {
 839                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
 840                 init_timer(&dst->link_poll_timer);
 841                 dst->link_poll_timer.data = (unsigned long)dst;
 842                 dst->link_poll_timer.function = dsa_link_poll_timer;
 843                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
 844                 add_timer(&dst->link_poll_timer);
 845         }
 846 }
 847
 848 static int dsa_probe(struct platform_device *pdev)
 849 {
 850         struct dsa_platform_data *pd = pdev->dev.platform_data;
 851         struct net_device *dev;
 852         struct dsa_switch_tree *dst;
 853         int ret;
 854
 855         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 856                        dsa_driver_version);
 857
 858         if (pdev->dev.of_node) {
 859                 ret = dsa_of_probe(&pdev->dev);
 860                 if (ret)
 861                         return ret;
 862
 863                 pd = pdev->dev.platform_data;
 864         }
 865
 866         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 867                 return -EINVAL;
 868
 869         if (pd->of_netdev) {
 870                 dev = pd->of_netdev;
 871                 dev_hold(dev);
 872         } else {
 873                 dev = dev_to_net_device(pd->netdev);
 874         }
 875         if (dev == NULL) {
 876                 ret = -EPROBE_DEFER;
 877                 goto out;
 878         }
 879
 880         if (dev->dsa_ptr != NULL) {
 881                 dev_put(dev);
 882                 ret = -EEXIST;
 883                 goto out;
 884         }
 885
 886         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
 887         if (dst == NULL) {
 888                 dev_put(dev);
 889                 ret = -ENOMEM;
 890                 goto out;
 891         }
 892
 893         platform_set_drvdata(pdev, dst);
 894
 895         dsa_setup_dst(dst, dev, &pdev->dev, pd);
 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         if (dst->link_poll_needed)
 910                 del_timer_sync(&dst->link_poll_timer);
 911
 912         flush_work(&dst->link_poll_work);
 913
 914         for (i = 0; i < dst->pd->nr_chips; i++) {
 915                 struct dsa_switch *ds = dst->ds[i];
 916
 917                 if (ds != NULL)
 918                         dsa_switch_destroy(ds);
 919         }
 920 }
 921
 922 static int dsa_remove(struct platform_device *pdev)
 923 {
 924         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 925
 926         dsa_remove_dst(dst);
 927         dsa_of_remove(&pdev->dev);
 928
 929         return 0;
 930 }
 931
 932 static void dsa_shutdown(struct platform_device *pdev)
 933 {
 934 }
 935
 936 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 937                           struct packet_type *pt, struct net_device *orig_dev)
 938 {
 939         struct dsa_switch_tree *dst = dev->dsa_ptr;
 940
 941         if (unlikely(dst == NULL)) {
 942                 kfree_skb(skb);
 943                 return 0;
 944         }
 945
 946         return dst->rcv(skb, dev, pt, orig_dev);
 947 }
 948
 949 static struct packet_type dsa_pack_type __read_mostly = {
 950         .type   = cpu_to_be16(ETH_P_XDSA),
 951         .func   = dsa_switch_rcv,
 952 };
 953
 954 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 955         .notifier_call  = dsa_slave_netdevice_event,
 956 };
 957
 958 #ifdef CONFIG_PM_SLEEP
 959 static int dsa_suspend(struct device *d)
 960 {
 961         struct platform_device *pdev = to_platform_device(d);
 962         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 963         int i, ret = 0;
 964
 965         for (i = 0; i < dst->pd->nr_chips; i++) {
 966                 struct dsa_switch *ds = dst->ds[i];
 967
 968                 if (ds != NULL)
 969                         ret = dsa_switch_suspend(ds);
 970         }
 971
 972         return ret;
 973 }
 974
 975 static int dsa_resume(struct device *d)
 976 {
 977         struct platform_device *pdev = to_platform_device(d);
 978         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 979         int i, ret = 0;
 980
 981         for (i = 0; i < dst->pd->nr_chips; i++) {
 982                 struct dsa_switch *ds = dst->ds[i];
 983
 984                 if (ds != NULL)
 985                         ret = dsa_switch_resume(ds);
 986         }
 987
 988         return ret;
 989 }
 990 #endif
 991
 992 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 993
 994 static const struct of_device_id dsa_of_match_table[] = {
 995         { .compatible = "brcm,bcm7445-switch-v4.0" },
 996         { .compatible = "marvell,dsa", },
 997         {}
 998 };
 999 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1000
1001 static struct platform_driver dsa_driver = {
1002         .probe          = dsa_probe,
1003         .remove         = dsa_remove,
1004         .shutdown       = dsa_shutdown,
1005         .driver = {
1006                 .name   = "dsa",
1007                 .of_match_table = dsa_of_match_table,
1008                 .pm     = &dsa_pm_ops,
1009         },
1010 };
1011
1012 static int __init dsa_init_module(void)
1013 {
1014         int rc;
1015
1016         register_netdevice_notifier(&dsa_netdevice_nb);
1017
1018         rc = platform_driver_register(&dsa_driver);
1019         if (rc)
1020                 return rc;
1021
1022         dev_add_pack(&dsa_pack_type);
1023
1024         return 0;
1025 }
1026 module_init(dsa_init_module);
1027
1028 static void __exit dsa_cleanup_module(void)
1029 {
1030         unregister_netdevice_notifier(&dsa_netdevice_nb);
1031         dev_remove_pack(&dsa_pack_type);
1032         platform_driver_unregister(&dsa_driver);
1033 }
1034 module_exit(dsa_cleanup_module);
1035
1036 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1037 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1038 MODULE_LICENSE("GPL");
1039 MODULE_ALIAS("platform:dsa");