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                  char **_name, void **priv)
  56 {
  57         struct dsa_switch_driver *ret;
  58         struct list_head *list;
  59         char *name;
  60
  61         ret = NULL;
  62         name = NULL;
  63
  64         mutex_lock(&dsa_switch_drivers_mutex);
  65         list_for_each(list, &dsa_switch_drivers) {
  66                 struct dsa_switch_driver *drv;
  67
  68                 drv = list_entry(list, struct dsa_switch_driver, list);
  69
  70                 name = drv->probe(parent, host_dev, sw_addr, priv);
  71                 if (name != NULL) {
  72                         ret = drv;
  73                         break;
  74                 }
  75         }
  76         mutex_unlock(&dsa_switch_drivers_mutex);
  77
  78         *_name = name;
  79
  80         return ret;
  81 }
  82
  83 /* hwmon support ************************************************************/
  84
  85 #ifdef CONFIG_NET_DSA_HWMON
  86
  87 static ssize_t temp1_input_show(struct device *dev,
  88                                 struct device_attribute *attr, char *buf)
  89 {
  90         struct dsa_switch *ds = dev_get_drvdata(dev);
  91         int temp, ret;
  92
  93         ret = ds->drv->get_temp(ds, &temp);
  94         if (ret < 0)
  95                 return ret;
  96
  97         return sprintf(buf, "%d\n", temp * 1000);
  98 }
  99 static DEVICE_ATTR_RO(temp1_input);
 100
 101 static ssize_t temp1_max_show(struct device *dev,
 102                               struct device_attribute *attr, char *buf)
 103 {
 104         struct dsa_switch *ds = dev_get_drvdata(dev);
 105         int temp, ret;
 106
 107         ret = ds->drv->get_temp_limit(ds, &temp);
 108         if (ret < 0)
 109                 return ret;
 110
 111         return sprintf(buf, "%d\n", temp * 1000);
 112 }
 113
 114 static ssize_t temp1_max_store(struct device *dev,
 115                                struct device_attribute *attr, const char *buf,
 116                                size_t count)
 117 {
 118         struct dsa_switch *ds = dev_get_drvdata(dev);
 119         int temp, ret;
 120
 121         ret = kstrtoint(buf, 0, &temp);
 122         if (ret < 0)
 123                 return ret;
 124
 125         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 126         if (ret < 0)
 127                 return ret;
 128
 129         return count;
 130 }
 131 static DEVICE_ATTR_RW(temp1_max);
 132
 133 static ssize_t temp1_max_alarm_show(struct device *dev,
 134                                     struct device_attribute *attr, char *buf)
 135 {
 136         struct dsa_switch *ds = dev_get_drvdata(dev);
 137         bool alarm;
 138         int ret;
 139
 140         ret = ds->drv->get_temp_alarm(ds, &alarm);
 141         if (ret < 0)
 142                 return ret;
 143
 144         return sprintf(buf, "%d\n", alarm);
 145 }
 146 static DEVICE_ATTR_RO(temp1_max_alarm);
 147
 148 static struct attribute *dsa_hwmon_attrs[] = {
 149         &dev_attr_temp1_input.attr,     /* 0 */
 150         &dev_attr_temp1_max.attr,       /* 1 */
 151         &dev_attr_temp1_max_alarm.attr, /* 2 */
 152         NULL
 153 };
 154
 155 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 156                                        struct attribute *attr, int index)
 157 {
 158         struct device *dev = container_of(kobj, struct device, kobj);
 159         struct dsa_switch *ds = dev_get_drvdata(dev);
 160         struct dsa_switch_driver *drv = ds->drv;
 161         umode_t mode = attr->mode;
 162
 163         if (index == 1) {
 164                 if (!drv->get_temp_limit)
 165                         mode = 0;
 166                 else if (!drv->set_temp_limit)
 167                         mode &= ~S_IWUSR;
 168         } else if (index == 2 && !drv->get_temp_alarm) {
 169                 mode = 0;
 170         }
 171         return mode;
 172 }
 173
 174 static const struct attribute_group dsa_hwmon_group = {
 175         .attrs = dsa_hwmon_attrs,
 176         .is_visible = dsa_hwmon_attrs_visible,
 177 };
 178 __ATTRIBUTE_GROUPS(dsa_hwmon);
 179
 180 #endif /* CONFIG_NET_DSA_HWMON */
 181
 182 /* basic switch operations **************************************************/
 183 static int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct net_device *master)
 184 {
 185         struct dsa_chip_data *cd = ds->pd;
 186         struct device_node *port_dn;
 187         struct phy_device *phydev;
 188         int ret, port, mode;
 189
 190         for (port = 0; port < DSA_MAX_PORTS; port++) {
 191                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 192                         continue;
 193
 194                 port_dn = cd->port_dn[port];
 195                 if (of_phy_is_fixed_link(port_dn)) {
 196                         ret = of_phy_register_fixed_link(port_dn);
 197                         if (ret) {
 198                                 netdev_err(master,
 199                                            "failed to register fixed PHY\n");
 200                                 return ret;
 201                         }
 202                         phydev = of_phy_find_device(port_dn);
 203
 204                         mode = of_get_phy_mode(port_dn);
 205                         if (mode < 0)
 206                                 mode = PHY_INTERFACE_MODE_NA;
 207                         phydev->interface = mode;
 208
 209                         genphy_config_init(phydev);
 210                         genphy_read_status(phydev);
 211                         if (ds->drv->adjust_link)
 212                                 ds->drv->adjust_link(ds, port, phydev);
 213                 }
 214         }
 215         return 0;
 216 }
 217
 218 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 219 {
 220         struct dsa_switch_driver *drv = ds->drv;
 221         struct dsa_switch_tree *dst = ds->dst;
 222         struct dsa_chip_data *pd = ds->pd;
 223         bool valid_name_found = false;
 224         int index = ds->index;
 225         int i, ret;
 226
 227         /*
 228          * Validate supplied switch configuration.
 229          */
 230         for (i = 0; i < DSA_MAX_PORTS; i++) {
 231                 char *name;
 232
 233                 name = pd->port_names[i];
 234                 if (name == NULL)
 235                         continue;
 236
 237                 if (!strcmp(name, "cpu")) {
 238                         if (dst->cpu_switch != -1) {
 239                                 netdev_err(dst->master_netdev,
 240                                            "multiple cpu ports?!\n");
 241                                 ret = -EINVAL;
 242                                 goto out;
 243                         }
 244                         dst->cpu_switch = index;
 245                         dst->cpu_port = i;
 246                 } else if (!strcmp(name, "dsa")) {
 247                         ds->dsa_port_mask |= 1 << i;
 248                 } else {
 249                         ds->phys_port_mask |= 1 << i;
 250                 }
 251                 valid_name_found = true;
 252         }
 253
 254         if (!valid_name_found && i == DSA_MAX_PORTS) {
 255                 ret = -EINVAL;
 256                 goto out;
 257         }
 258
 259         /* Make the built-in MII bus mask match the number of ports,
 260          * switch drivers can override this later
 261          */
 262         ds->phys_mii_mask = ds->phys_port_mask;
 263
 264         /*
 265          * If the CPU connects to this switch, set the switch tree
 266          * tagging protocol to the preferred tagging format of this
 267          * switch.
 268          */
 269         if (dst->cpu_switch == index) {
 270                 switch (ds->tag_protocol) {
 271 #ifdef CONFIG_NET_DSA_TAG_DSA
 272                 case DSA_TAG_PROTO_DSA:
 273                         dst->rcv = dsa_netdev_ops.rcv;
 274                         break;
 275 #endif
 276 #ifdef CONFIG_NET_DSA_TAG_EDSA
 277                 case DSA_TAG_PROTO_EDSA:
 278                         dst->rcv = edsa_netdev_ops.rcv;
 279                         break;
 280 #endif
 281 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 282                 case DSA_TAG_PROTO_TRAILER:
 283                         dst->rcv = trailer_netdev_ops.rcv;
 284                         break;
 285 #endif
 286 #ifdef CONFIG_NET_DSA_TAG_BRCM
 287                 case DSA_TAG_PROTO_BRCM:
 288                         dst->rcv = brcm_netdev_ops.rcv;
 289                         break;
 290 #endif
 291                 case DSA_TAG_PROTO_NONE:
 292                         break;
 293                 default:
 294                         ret = -ENOPROTOOPT;
 295                         goto out;
 296                 }
 297
 298                 dst->tag_protocol = ds->tag_protocol;
 299         }
 300
 301         /*
 302          * Do basic register setup.
 303          */
 304         ret = drv->setup(ds);
 305         if (ret < 0)
 306                 goto out;
 307
 308         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 309         if (ret < 0)
 310                 goto out;
 311
 312         ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 313         if (ds->slave_mii_bus == NULL) {
 314                 ret = -ENOMEM;
 315                 goto out;
 316         }
 317         dsa_slave_mii_bus_init(ds);
 318
 319         ret = mdiobus_register(ds->slave_mii_bus);
 320         if (ret < 0)
 321                 goto out;
 322
 323
 324         /*
 325          * Create network devices for physical switch ports.
 326          */
 327         for (i = 0; i < DSA_MAX_PORTS; i++) {
 328                 if (!(ds->phys_port_mask & (1 << i)))
 329                         continue;
 330
 331                 ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
 332                 if (ret < 0) {
 333                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 334                                    index, i, pd->port_names[i], ret);
 335                         ret = 0;
 336                 }
 337         }
 338
 339         /* Perform configuration of the CPU and DSA ports */
 340         ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
 341         if (ret < 0) {
 342                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 343                            index);
 344                 ret = 0;
 345         }
 346
 347 #ifdef CONFIG_NET_DSA_HWMON
 348         /* If the switch provides a temperature sensor,
 349          * register with hardware monitoring subsystem.
 350          * Treat registration error as non-fatal and ignore it.
 351          */
 352         if (drv->get_temp) {
 353                 const char *netname = netdev_name(dst->master_netdev);
 354                 char hname[IFNAMSIZ + 1];
 355                 int i, j;
 356
 357                 /* Create valid hwmon 'name' attribute */
 358                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 359                         if (isalnum(netname[i]))
 360                                 hname[j++] = netname[i];
 361                 }
 362                 hname[j] = '\0';
 363                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 364                           hname, index);
 365                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 366                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 367                 if (IS_ERR(ds->hwmon_dev))
 368                         ds->hwmon_dev = NULL;
 369         }
 370 #endif /* CONFIG_NET_DSA_HWMON */
 371
 372         return ret;
 373
 374 out:
 375         return ret;
 376 }
 377
 378 static struct dsa_switch *
 379 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 380                  struct device *parent, struct device *host_dev)
 381 {
 382         struct dsa_chip_data *pd = dst->pd->chip + index;
 383         struct dsa_switch_driver *drv;
 384         struct dsa_switch *ds;
 385         int ret;
 386         char *name;
 387         void *priv;
 388
 389         /*
 390          * Probe for switch model.
 391          */
 392         drv = dsa_switch_probe(parent, host_dev, pd->sw_addr, &name, &priv);
 393         if (drv == NULL) {
 394                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 395                            index);
 396                 return ERR_PTR(-EINVAL);
 397         }
 398         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 399                     index, name);
 400
 401
 402         /*
 403          * Allocate and initialise switch state.
 404          */
 405         ds = devm_kzalloc(parent, sizeof(*ds) + drv->priv_size, GFP_KERNEL);
 406         if (ds == NULL)
 407                 return ERR_PTR(-ENOMEM);
 408
 409         ds->dst = dst;
 410         ds->index = index;
 411         ds->pd = pd;
 412         ds->drv = drv;
 413         ds->priv = priv;
 414         ds->tag_protocol = drv->tag_protocol;
 415         ds->master_dev = host_dev;
 416
 417         ret = dsa_switch_setup_one(ds, parent);
 418         if (ret)
 419                 return ERR_PTR(ret);
 420
 421         return ds;
 422 }
 423
 424 static void dsa_switch_destroy(struct dsa_switch *ds)
 425 {
 426         struct device_node *port_dn;
 427         struct phy_device *phydev;
 428         struct dsa_chip_data *cd = ds->pd;
 429         int port;
 430
 431 #ifdef CONFIG_NET_DSA_HWMON
 432         if (ds->hwmon_dev)
 433                 hwmon_device_unregister(ds->hwmon_dev);
 434 #endif
 435
 436         /* Destroy network devices for physical switch ports. */
 437         for (port = 0; port < DSA_MAX_PORTS; port++) {
 438                 if (!(ds->phys_port_mask & (1 << port)))
 439                         continue;
 440
 441                 if (!ds->ports[port])
 442                         continue;
 443
 444                 dsa_slave_destroy(ds->ports[port]);
 445         }
 446
 447         /* Remove any fixed link PHYs */
 448         for (port = 0; port < DSA_MAX_PORTS; port++) {
 449                 port_dn = cd->port_dn[port];
 450                 if (of_phy_is_fixed_link(port_dn)) {
 451                         phydev = of_phy_find_device(port_dn);
 452                         if (phydev) {
 453                                 phy_device_free(phydev);
 454                                 of_node_put(port_dn);
 455                                 fixed_phy_unregister(phydev);
 456                         }
 457                 }
 458         }
 459
 460         mdiobus_unregister(ds->slave_mii_bus);
 461 }
 462
 463 #ifdef CONFIG_PM_SLEEP
 464 static int dsa_switch_suspend(struct dsa_switch *ds)
 465 {
 466         int i, ret = 0;
 467
 468         /* Suspend slave network devices */
 469         for (i = 0; i < DSA_MAX_PORTS; i++) {
 470                 if (!dsa_is_port_initialized(ds, i))
 471                         continue;
 472
 473                 ret = dsa_slave_suspend(ds->ports[i]);
 474                 if (ret)
 475                         return ret;
 476         }
 477
 478         if (ds->drv->suspend)
 479                 ret = ds->drv->suspend(ds);
 480
 481         return ret;
 482 }
 483
 484 static int dsa_switch_resume(struct dsa_switch *ds)
 485 {
 486         int i, ret = 0;
 487
 488         if (ds->drv->resume)
 489                 ret = ds->drv->resume(ds);
 490
 491         if (ret)
 492                 return ret;
 493
 494         /* Resume slave network devices */
 495         for (i = 0; i < DSA_MAX_PORTS; i++) {
 496                 if (!dsa_is_port_initialized(ds, i))
 497                         continue;
 498
 499                 ret = dsa_slave_resume(ds->ports[i]);
 500                 if (ret)
 501                         return ret;
 502         }
 503
 504         return 0;
 505 }
 506 #endif
 507
 508 /* platform driver init and cleanup *****************************************/
 509 static int dev_is_class(struct device *dev, void *class)
 510 {
 511         if (dev->class != NULL && !strcmp(dev->class->name, class))
 512                 return 1;
 513
 514         return 0;
 515 }
 516
 517 static struct device *dev_find_class(struct device *parent, char *class)
 518 {
 519         if (dev_is_class(parent, class)) {
 520                 get_device(parent);
 521                 return parent;
 522         }
 523
 524         return device_find_child(parent, class, dev_is_class);
 525 }
 526
 527 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 528 {
 529         struct device *d;
 530
 531         d = dev_find_class(dev, "mdio_bus");
 532         if (d != NULL) {
 533                 struct mii_bus *bus;
 534
 535                 bus = to_mii_bus(d);
 536                 put_device(d);
 537
 538                 return bus;
 539         }
 540
 541         return NULL;
 542 }
 543 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 544
 545 static struct net_device *dev_to_net_device(struct device *dev)
 546 {
 547         struct device *d;
 548
 549         d = dev_find_class(dev, "net");
 550         if (d != NULL) {
 551                 struct net_device *nd;
 552
 553                 nd = to_net_dev(d);
 554                 dev_hold(nd);
 555                 put_device(d);
 556
 557                 return nd;
 558         }
 559
 560         return NULL;
 561 }
 562
 563 #ifdef CONFIG_OF
 564 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 565                                         struct dsa_chip_data *cd,
 566                                         int chip_index, int port_index,
 567                                         struct device_node *link)
 568 {
 569         const __be32 *reg;
 570         int link_sw_addr;
 571         struct device_node *parent_sw;
 572         int len;
 573
 574         parent_sw = of_get_parent(link);
 575         if (!parent_sw)
 576                 return -EINVAL;
 577
 578         reg = of_get_property(parent_sw, "reg", &len);
 579         if (!reg || (len != sizeof(*reg) * 2))
 580                 return -EINVAL;
 581
 582         /*
 583          * Get the destination switch number from the second field of its 'reg'
 584          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 585          */
 586         link_sw_addr = be32_to_cpup(reg + 1);
 587
 588         if (link_sw_addr >= pd->nr_chips)
 589                 return -EINVAL;
 590
 591         /* First time routing table allocation */
 592         if (!cd->rtable) {
 593                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
 594                                            GFP_KERNEL);
 595                 if (!cd->rtable)
 596                         return -ENOMEM;
 597
 598                 /* default to no valid uplink/downlink */
 599                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
 600         }
 601
 602         cd->rtable[link_sw_addr] = port_index;
 603
 604         return 0;
 605 }
 606
 607 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 608                               struct dsa_chip_data *cd,
 609                               int chip_index, int port_index,
 610                               struct device_node *port,
 611                               const char *port_name)
 612 {
 613         struct device_node *link;
 614         int link_index;
 615         int ret;
 616
 617         for (link_index = 0;; link_index++) {
 618                 link = of_parse_phandle(port, "link", link_index);
 619                 if (!link)
 620                         break;
 621
 622                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 623                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 624                                                          port_index, link);
 625                         if (ret)
 626                                 return ret;
 627                 }
 628         }
 629         return 0;
 630 }
 631
 632 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 633 {
 634         int i;
 635         int port_index;
 636
 637         for (i = 0; i < pd->nr_chips; i++) {
 638                 port_index = 0;
 639                 while (port_index < DSA_MAX_PORTS) {
 640                         kfree(pd->chip[i].port_names[port_index]);
 641                         port_index++;
 642                 }
 643                 kfree(pd->chip[i].rtable);
 644
 645                 /* Drop our reference to the MDIO bus device */
 646                 if (pd->chip[i].host_dev)
 647                         put_device(pd->chip[i].host_dev);
 648         }
 649         kfree(pd->chip);
 650 }
 651
 652 static int dsa_of_probe(struct device *dev)
 653 {
 654         struct device_node *np = dev->of_node;
 655         struct device_node *child, *mdio, *ethernet, *port;
 656         struct mii_bus *mdio_bus, *mdio_bus_switch;
 657         struct net_device *ethernet_dev;
 658         struct dsa_platform_data *pd;
 659         struct dsa_chip_data *cd;
 660         const char *port_name;
 661         int chip_index, port_index;
 662         const unsigned int *sw_addr, *port_reg;
 663         int gpio;
 664         enum of_gpio_flags of_flags;
 665         unsigned long flags;
 666         u32 eeprom_len;
 667         int ret;
 668
 669         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 670         if (!mdio)
 671                 return -EINVAL;
 672
 673         mdio_bus = of_mdio_find_bus(mdio);
 674         if (!mdio_bus)
 675                 return -EPROBE_DEFER;
 676
 677         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 678         if (!ethernet) {
 679                 ret = -EINVAL;
 680                 goto out_put_mdio;
 681         }
 682
 683         ethernet_dev = of_find_net_device_by_node(ethernet);
 684         if (!ethernet_dev) {
 685                 ret = -EPROBE_DEFER;
 686                 goto out_put_mdio;
 687         }
 688
 689         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 690         if (!pd) {
 691                 ret = -ENOMEM;
 692                 goto out_put_ethernet;
 693         }
 694
 695         dev->platform_data = pd;
 696         pd->of_netdev = ethernet_dev;
 697         pd->nr_chips = of_get_available_child_count(np);
 698         if (pd->nr_chips > DSA_MAX_SWITCHES)
 699                 pd->nr_chips = DSA_MAX_SWITCHES;
 700
 701         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 702                            GFP_KERNEL);
 703         if (!pd->chip) {
 704                 ret = -ENOMEM;
 705                 goto out_free;
 706         }
 707
 708         chip_index = -1;
 709         for_each_available_child_of_node(np, child) {
 710                 chip_index++;
 711                 cd = &pd->chip[chip_index];
 712
 713                 cd->of_node = child;
 714
 715                 /* When assigning the host device, increment its refcount */
 716                 cd->host_dev = get_device(&mdio_bus->dev);
 717
 718                 sw_addr = of_get_property(child, "reg", NULL);
 719                 if (!sw_addr)
 720                         continue;
 721
 722                 cd->sw_addr = be32_to_cpup(sw_addr);
 723                 if (cd->sw_addr >= PHY_MAX_ADDR)
 724                         continue;
 725
 726                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 727                         cd->eeprom_len = eeprom_len;
 728
 729                 mdio = of_parse_phandle(child, "mii-bus", 0);
 730                 if (mdio) {
 731                         mdio_bus_switch = of_mdio_find_bus(mdio);
 732                         if (!mdio_bus_switch) {
 733                                 ret = -EPROBE_DEFER;
 734                                 goto out_free_chip;
 735                         }
 736
 737                         /* Drop the mdio_bus device ref, replacing the host
 738                          * device with the mdio_bus_switch device, keeping
 739                          * the refcount from of_mdio_find_bus() above.
 740                          */
 741                         put_device(cd->host_dev);
 742                         cd->host_dev = &mdio_bus_switch->dev;
 743                 }
 744                 gpio = of_get_named_gpio_flags(child, "reset-gpios", 0,
 745                                                &of_flags);
 746                 if (gpio_is_valid(gpio)) {
 747                         flags = (of_flags == OF_GPIO_ACTIVE_LOW ?
 748                                  GPIOF_ACTIVE_LOW : 0);
 749                         ret = devm_gpio_request_one(dev, gpio, flags,
 750                                                     "switch_reset");
 751                         if (ret)
 752                                 goto out_free_chip;
 753
 754                         cd->reset = gpio_to_desc(gpio);
 755                         gpiod_direction_output(cd->reset, 0);
 756                 }
 757
 758                 for_each_available_child_of_node(child, port) {
 759                         port_reg = of_get_property(port, "reg", NULL);
 760                         if (!port_reg)
 761                                 continue;
 762
 763                         port_index = be32_to_cpup(port_reg);
 764                         if (port_index >= DSA_MAX_PORTS)
 765                                 break;
 766
 767                         port_name = of_get_property(port, "label", NULL);
 768                         if (!port_name)
 769                                 continue;
 770
 771                         cd->port_dn[port_index] = port;
 772
 773                         cd->port_names[port_index] = kstrdup(port_name,
 774                                         GFP_KERNEL);
 775                         if (!cd->port_names[port_index]) {
 776                                 ret = -ENOMEM;
 777                                 goto out_free_chip;
 778                         }
 779
 780                         ret = dsa_of_probe_links(pd, cd, chip_index,
 781                                                  port_index, port, port_name);
 782                         if (ret)
 783                                 goto out_free_chip;
 784
 785                 }
 786         }
 787
 788         /* The individual chips hold their own refcount on the mdio bus,
 789          * so drop ours */
 790         put_device(&mdio_bus->dev);
 791
 792         return 0;
 793
 794 out_free_chip:
 795         dsa_of_free_platform_data(pd);
 796 out_free:
 797         kfree(pd);
 798         dev->platform_data = NULL;
 799 out_put_ethernet:
 800         put_device(&ethernet_dev->dev);
 801 out_put_mdio:
 802         put_device(&mdio_bus->dev);
 803         return ret;
 804 }
 805
 806 static void dsa_of_remove(struct device *dev)
 807 {
 808         struct dsa_platform_data *pd = dev->platform_data;
 809
 810         if (!dev->of_node)
 811                 return;
 812
 813         dsa_of_free_platform_data(pd);
 814         put_device(&pd->of_netdev->dev);
 815         kfree(pd);
 816 }
 817 #else
 818 static inline int dsa_of_probe(struct device *dev)
 819 {
 820         return 0;
 821 }
 822
 823 static inline void dsa_of_remove(struct device *dev)
 824 {
 825 }
 826 #endif
 827
 828 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 829                          struct device *parent, struct dsa_platform_data *pd)
 830 {
 831         int i;
 832         unsigned configured = 0;
 833
 834         dst->pd = pd;
 835         dst->master_netdev = dev;
 836         dst->cpu_switch = -1;
 837         dst->cpu_port = -1;
 838
 839         for (i = 0; i < pd->nr_chips; i++) {
 840                 struct dsa_switch *ds;
 841
 842                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 843                 if (IS_ERR(ds)) {
 844                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 845                                    i, PTR_ERR(ds));
 846                         continue;
 847                 }
 848
 849                 dst->ds[i] = ds;
 850
 851                 ++configured;
 852         }
 853
 854         /*
 855          * If no switch was found, exit cleanly
 856          */
 857         if (!configured)
 858                 return -EPROBE_DEFER;
 859
 860         /*
 861          * If we use a tagging format that doesn't have an ethertype
 862          * field, make sure that all packets from this point on get
 863          * sent to the tag format's receive function.
 864          */
 865         wmb();
 866         dev->dsa_ptr = (void *)dst;
 867
 868         return 0;
 869 }
 870
 871 static int dsa_probe(struct platform_device *pdev)
 872 {
 873         struct dsa_platform_data *pd = pdev->dev.platform_data;
 874         struct net_device *dev;
 875         struct dsa_switch_tree *dst;
 876         int ret;
 877
 878         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 879                        dsa_driver_version);
 880
 881         if (pdev->dev.of_node) {
 882                 ret = dsa_of_probe(&pdev->dev);
 883                 if (ret)
 884                         return ret;
 885
 886                 pd = pdev->dev.platform_data;
 887         }
 888
 889         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 890                 return -EINVAL;
 891
 892         if (pd->of_netdev) {
 893                 dev = pd->of_netdev;
 894                 dev_hold(dev);
 895         } else {
 896                 dev = dev_to_net_device(pd->netdev);
 897         }
 898         if (dev == NULL) {
 899                 ret = -EPROBE_DEFER;
 900                 goto out;
 901         }
 902
 903         if (dev->dsa_ptr != NULL) {
 904                 dev_put(dev);
 905                 ret = -EEXIST;
 906                 goto out;
 907         }
 908
 909         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 910         if (dst == NULL) {
 911                 dev_put(dev);
 912                 ret = -ENOMEM;
 913                 goto out;
 914         }
 915
 916         platform_set_drvdata(pdev, dst);
 917
 918         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 919         if (ret) {
 920                 dev_put(dev);
 921                 goto out;
 922         }
 923
 924         return 0;
 925
 926 out:
 927         dsa_of_remove(&pdev->dev);
 928
 929         return ret;
 930 }
 931
 932 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 933 {
 934         int i;
 935
 936         dst->master_netdev->dsa_ptr = NULL;
 937
 938         /* If we used a tagging format that doesn't have an ethertype
 939          * field, make sure that all packets from this point get sent
 940          * without the tag and go through the regular receive path.
 941          */
 942         wmb();
 943
 944         for (i = 0; i < dst->pd->nr_chips; i++) {
 945                 struct dsa_switch *ds = dst->ds[i];
 946
 947                 if (ds)
 948                         dsa_switch_destroy(ds);
 949         }
 950
 951         dev_put(dst->master_netdev);
 952 }
 953
 954 static int dsa_remove(struct platform_device *pdev)
 955 {
 956         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 957
 958         dsa_remove_dst(dst);
 959         dsa_of_remove(&pdev->dev);
 960
 961         return 0;
 962 }
 963
 964 static void dsa_shutdown(struct platform_device *pdev)
 965 {
 966 }
 967
 968 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 969                           struct packet_type *pt, struct net_device *orig_dev)
 970 {
 971         struct dsa_switch_tree *dst = dev->dsa_ptr;
 972
 973         if (unlikely(dst == NULL)) {
 974                 kfree_skb(skb);
 975                 return 0;
 976         }
 977
 978         return dst->rcv(skb, dev, pt, orig_dev);
 979 }
 980
 981 static struct packet_type dsa_pack_type __read_mostly = {
 982         .type   = cpu_to_be16(ETH_P_XDSA),
 983         .func   = dsa_switch_rcv,
 984 };
 985
 986 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 987         .notifier_call  = dsa_slave_netdevice_event,
 988 };
 989
 990 #ifdef CONFIG_PM_SLEEP
 991 static int dsa_suspend(struct device *d)
 992 {
 993         struct platform_device *pdev = to_platform_device(d);
 994         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 995         int i, ret = 0;
 996
 997         for (i = 0; i < dst->pd->nr_chips; i++) {
 998                 struct dsa_switch *ds = dst->ds[i];
 999
1000                 if (ds != NULL)
1001                         ret = dsa_switch_suspend(ds);
1002         }
1003
1004         return ret;
1005 }
1006
1007 static int dsa_resume(struct device *d)
1008 {
1009         struct platform_device *pdev = to_platform_device(d);
1010         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1011         int i, ret = 0;
1012
1013         for (i = 0; i < dst->pd->nr_chips; i++) {
1014                 struct dsa_switch *ds = dst->ds[i];
1015
1016                 if (ds != NULL)
1017                         ret = dsa_switch_resume(ds);
1018         }
1019
1020         return ret;
1021 }
1022 #endif
1023
1024 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1025
1026 static const struct of_device_id dsa_of_match_table[] = {
1027         { .compatible = "brcm,bcm7445-switch-v4.0" },
1028         { .compatible = "marvell,dsa", },
1029         {}
1030 };
1031 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1032
1033 static struct platform_driver dsa_driver = {
1034         .probe          = dsa_probe,
1035         .remove         = dsa_remove,
1036         .shutdown       = dsa_shutdown,
1037         .driver = {
1038                 .name   = "dsa",
1039                 .of_match_table = dsa_of_match_table,
1040                 .pm     = &dsa_pm_ops,
1041         },
1042 };
1043
1044 static int __init dsa_init_module(void)
1045 {
1046         int rc;
1047
1048         register_netdevice_notifier(&dsa_netdevice_nb);
1049
1050         rc = platform_driver_register(&dsa_driver);
1051         if (rc)
1052                 return rc;
1053
1054         dev_add_pack(&dsa_pack_type);
1055
1056         return 0;
1057 }
1058 module_init(dsa_init_module);
1059
1060 static void __exit dsa_cleanup_module(void)
1061 {
1062         unregister_netdevice_notifier(&dsa_netdevice_nb);
1063         dev_remove_pack(&dsa_pack_type);
1064         platform_driver_unregister(&dsa_driver);
1065 }
1066 module_exit(dsa_cleanup_module);
1067
1068 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1069 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1070 MODULE_LICENSE("GPL");
1071 MODULE_ALIAS("platform:dsa");