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 *host_dev, int sw_addr, char **_name)
  55 {
  56         struct dsa_switch_driver *ret;
  57         struct list_head *list;
  58         char *name;
  59
  60         ret = NULL;
  61         name = NULL;
  62
  63         mutex_lock(&dsa_switch_drivers_mutex);
  64         list_for_each(list, &dsa_switch_drivers) {
  65                 struct dsa_switch_driver *drv;
  66
  67                 drv = list_entry(list, struct dsa_switch_driver, list);
  68
  69                 name = drv->probe(host_dev, sw_addr);
  70                 if (name != NULL) {
  71                         ret = drv;
  72                         break;
  73                 }
  74         }
  75         mutex_unlock(&dsa_switch_drivers_mutex);
  76
  77         *_name = name;
  78
  79         return ret;
  80 }
  81
  82 /* hwmon support ************************************************************/
  83
  84 #ifdef CONFIG_NET_DSA_HWMON
  85
  86 static ssize_t temp1_input_show(struct device *dev,
  87                                 struct device_attribute *attr, char *buf)
  88 {
  89         struct dsa_switch *ds = dev_get_drvdata(dev);
  90         int temp, ret;
  91
  92         ret = ds->drv->get_temp(ds, &temp);
  93         if (ret < 0)
  94                 return ret;
  95
  96         return sprintf(buf, "%d\n", temp * 1000);
  97 }
  98 static DEVICE_ATTR_RO(temp1_input);
  99
 100 static ssize_t temp1_max_show(struct device *dev,
 101                               struct device_attribute *attr, char *buf)
 102 {
 103         struct dsa_switch *ds = dev_get_drvdata(dev);
 104         int temp, ret;
 105
 106         ret = ds->drv->get_temp_limit(ds, &temp);
 107         if (ret < 0)
 108                 return ret;
 109
 110         return sprintf(buf, "%d\n", temp * 1000);
 111 }
 112
 113 static ssize_t temp1_max_store(struct device *dev,
 114                                struct device_attribute *attr, const char *buf,
 115                                size_t count)
 116 {
 117         struct dsa_switch *ds = dev_get_drvdata(dev);
 118         int temp, ret;
 119
 120         ret = kstrtoint(buf, 0, &temp);
 121         if (ret < 0)
 122                 return ret;
 123
 124         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 125         if (ret < 0)
 126                 return ret;
 127
 128         return count;
 129 }
 130 static DEVICE_ATTR_RW(temp1_max);
 131
 132 static ssize_t temp1_max_alarm_show(struct device *dev,
 133                                     struct device_attribute *attr, char *buf)
 134 {
 135         struct dsa_switch *ds = dev_get_drvdata(dev);
 136         bool alarm;
 137         int ret;
 138
 139         ret = ds->drv->get_temp_alarm(ds, &alarm);
 140         if (ret < 0)
 141                 return ret;
 142
 143         return sprintf(buf, "%d\n", alarm);
 144 }
 145 static DEVICE_ATTR_RO(temp1_max_alarm);
 146
 147 static struct attribute *dsa_hwmon_attrs[] = {
 148         &dev_attr_temp1_input.attr,     /* 0 */
 149         &dev_attr_temp1_max.attr,       /* 1 */
 150         &dev_attr_temp1_max_alarm.attr, /* 2 */
 151         NULL
 152 };
 153
 154 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 155                                        struct attribute *attr, int index)
 156 {
 157         struct device *dev = container_of(kobj, struct device, kobj);
 158         struct dsa_switch *ds = dev_get_drvdata(dev);
 159         struct dsa_switch_driver *drv = ds->drv;
 160         umode_t mode = attr->mode;
 161
 162         if (index == 1) {
 163                 if (!drv->get_temp_limit)
 164                         mode = 0;
 165                 else if (!drv->set_temp_limit)
 166                         mode &= ~S_IWUSR;
 167         } else if (index == 2 && !drv->get_temp_alarm) {
 168                 mode = 0;
 169         }
 170         return mode;
 171 }
 172
 173 static const struct attribute_group dsa_hwmon_group = {
 174         .attrs = dsa_hwmon_attrs,
 175         .is_visible = dsa_hwmon_attrs_visible,
 176 };
 177 __ATTRIBUTE_GROUPS(dsa_hwmon);
 178
 179 #endif /* CONFIG_NET_DSA_HWMON */
 180
 181 /* basic switch operations **************************************************/
 182 static int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct net_device *master)
 183 {
 184         struct dsa_chip_data *cd = ds->pd;
 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 = cd->port_dn[port];
 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 *pd = ds->pd;
 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 = pd->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->phys_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->phys_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 (ds->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 = ds->tag_protocol;
 298         }
 299
 300         /*
 301          * Do basic register setup.
 302          */
 303         ret = drv->setup(ds);
 304         if (ret < 0)
 305                 goto out;
 306
 307         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 308         if (ret < 0)
 309                 goto out;
 310
 311         ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 312         if (ds->slave_mii_bus == NULL) {
 313                 ret = -ENOMEM;
 314                 goto out;
 315         }
 316         dsa_slave_mii_bus_init(ds);
 317
 318         ret = mdiobus_register(ds->slave_mii_bus);
 319         if (ret < 0)
 320                 goto out;
 321
 322
 323         /*
 324          * Create network devices for physical switch ports.
 325          */
 326         for (i = 0; i < DSA_MAX_PORTS; i++) {
 327                 if (!(ds->phys_port_mask & (1 << i)))
 328                         continue;
 329
 330                 ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
 331                 if (ret < 0) {
 332                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 333                                    index, i, pd->port_names[i], ret);
 334                         ret = 0;
 335                 }
 336         }
 337
 338         /* Perform configuration of the CPU and DSA ports */
 339         ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
 340         if (ret < 0) {
 341                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 342                            index);
 343                 ret = 0;
 344         }
 345
 346 #ifdef CONFIG_NET_DSA_HWMON
 347         /* If the switch provides a temperature sensor,
 348          * register with hardware monitoring subsystem.
 349          * Treat registration error as non-fatal and ignore it.
 350          */
 351         if (drv->get_temp) {
 352                 const char *netname = netdev_name(dst->master_netdev);
 353                 char hname[IFNAMSIZ + 1];
 354                 int i, j;
 355
 356                 /* Create valid hwmon 'name' attribute */
 357                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 358                         if (isalnum(netname[i]))
 359                                 hname[j++] = netname[i];
 360                 }
 361                 hname[j] = '\0';
 362                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 363                           hname, index);
 364                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 365                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 366                 if (IS_ERR(ds->hwmon_dev))
 367                         ds->hwmon_dev = NULL;
 368         }
 369 #endif /* CONFIG_NET_DSA_HWMON */
 370
 371         return ret;
 372
 373 out:
 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 = devm_kzalloc(parent, 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         struct device_node *port_dn;
 424         struct phy_device *phydev;
 425         struct dsa_chip_data *cd = ds->pd;
 426         int port;
 427
 428 #ifdef CONFIG_NET_DSA_HWMON
 429         if (ds->hwmon_dev)
 430                 hwmon_device_unregister(ds->hwmon_dev);
 431 #endif
 432
 433         /* Destroy network devices for physical switch ports. */
 434         for (port = 0; port < DSA_MAX_PORTS; port++) {
 435                 if (!(ds->phys_port_mask & (1 << port)))
 436                         continue;
 437
 438                 if (!ds->ports[port])
 439                         continue;
 440
 441                 dsa_slave_destroy(ds->ports[port]);
 442         }
 443
 444         /* Remove any fixed link PHYs */
 445         for (port = 0; port < DSA_MAX_PORTS; port++) {
 446                 port_dn = cd->port_dn[port];
 447                 if (of_phy_is_fixed_link(port_dn)) {
 448                         phydev = of_phy_find_device(port_dn);
 449                         if (phydev) {
 450                                 phy_device_free(phydev);
 451                                 of_node_put(port_dn);
 452                                 fixed_phy_unregister(phydev);
 453                         }
 454                 }
 455         }
 456
 457         mdiobus_unregister(ds->slave_mii_bus);
 458 }
 459
 460 #ifdef CONFIG_PM_SLEEP
 461 static int dsa_switch_suspend(struct dsa_switch *ds)
 462 {
 463         int i, ret = 0;
 464
 465         /* Suspend slave network devices */
 466         for (i = 0; i < DSA_MAX_PORTS; i++) {
 467                 if (!dsa_is_port_initialized(ds, i))
 468                         continue;
 469
 470                 ret = dsa_slave_suspend(ds->ports[i]);
 471                 if (ret)
 472                         return ret;
 473         }
 474
 475         if (ds->drv->suspend)
 476                 ret = ds->drv->suspend(ds);
 477
 478         return ret;
 479 }
 480
 481 static int dsa_switch_resume(struct dsa_switch *ds)
 482 {
 483         int i, ret = 0;
 484
 485         if (ds->drv->resume)
 486                 ret = ds->drv->resume(ds);
 487
 488         if (ret)
 489                 return ret;
 490
 491         /* Resume slave network devices */
 492         for (i = 0; i < DSA_MAX_PORTS; i++) {
 493                 if (!dsa_is_port_initialized(ds, i))
 494                         continue;
 495
 496                 ret = dsa_slave_resume(ds->ports[i]);
 497                 if (ret)
 498                         return ret;
 499         }
 500
 501         return 0;
 502 }
 503 #endif
 504
 505 /* platform driver init and cleanup *****************************************/
 506 static int dev_is_class(struct device *dev, void *class)
 507 {
 508         if (dev->class != NULL && !strcmp(dev->class->name, class))
 509                 return 1;
 510
 511         return 0;
 512 }
 513
 514 static struct device *dev_find_class(struct device *parent, char *class)
 515 {
 516         if (dev_is_class(parent, class)) {
 517                 get_device(parent);
 518                 return parent;
 519         }
 520
 521         return device_find_child(parent, class, dev_is_class);
 522 }
 523
 524 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 525 {
 526         struct device *d;
 527
 528         d = dev_find_class(dev, "mdio_bus");
 529         if (d != NULL) {
 530                 struct mii_bus *bus;
 531
 532                 bus = to_mii_bus(d);
 533                 put_device(d);
 534
 535                 return bus;
 536         }
 537
 538         return NULL;
 539 }
 540 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 541
 542 static struct net_device *dev_to_net_device(struct device *dev)
 543 {
 544         struct device *d;
 545
 546         d = dev_find_class(dev, "net");
 547         if (d != NULL) {
 548                 struct net_device *nd;
 549
 550                 nd = to_net_dev(d);
 551                 dev_hold(nd);
 552                 put_device(d);
 553
 554                 return nd;
 555         }
 556
 557         return NULL;
 558 }
 559
 560 #ifdef CONFIG_OF
 561 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 562                                         struct dsa_chip_data *cd,
 563                                         int chip_index, int port_index,
 564                                         struct device_node *link)
 565 {
 566         const __be32 *reg;
 567         int link_sw_addr;
 568         struct device_node *parent_sw;
 569         int len;
 570
 571         parent_sw = of_get_parent(link);
 572         if (!parent_sw)
 573                 return -EINVAL;
 574
 575         reg = of_get_property(parent_sw, "reg", &len);
 576         if (!reg || (len != sizeof(*reg) * 2))
 577                 return -EINVAL;
 578
 579         /*
 580          * Get the destination switch number from the second field of its 'reg'
 581          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 582          */
 583         link_sw_addr = be32_to_cpup(reg + 1);
 584
 585         if (link_sw_addr >= pd->nr_chips)
 586                 return -EINVAL;
 587
 588         /* First time routing table allocation */
 589         if (!cd->rtable) {
 590                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
 591                                            GFP_KERNEL);
 592                 if (!cd->rtable)
 593                         return -ENOMEM;
 594
 595                 /* default to no valid uplink/downlink */
 596                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
 597         }
 598
 599         cd->rtable[link_sw_addr] = port_index;
 600
 601         return 0;
 602 }
 603
 604 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 605                               struct dsa_chip_data *cd,
 606                               int chip_index, int port_index,
 607                               struct device_node *port,
 608                               const char *port_name)
 609 {
 610         struct device_node *link;
 611         int link_index;
 612         int ret;
 613
 614         for (link_index = 0;; link_index++) {
 615                 link = of_parse_phandle(port, "link", link_index);
 616                 if (!link)
 617                         break;
 618
 619                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 620                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 621                                                          port_index, link);
 622                         if (ret)
 623                                 return ret;
 624                 }
 625         }
 626         return 0;
 627 }
 628
 629 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 630 {
 631         int i;
 632         int port_index;
 633
 634         for (i = 0; i < pd->nr_chips; i++) {
 635                 port_index = 0;
 636                 while (port_index < DSA_MAX_PORTS) {
 637                         kfree(pd->chip[i].port_names[port_index]);
 638                         port_index++;
 639                 }
 640                 kfree(pd->chip[i].rtable);
 641
 642                 /* Drop our reference to the MDIO bus device */
 643                 if (pd->chip[i].host_dev)
 644                         put_device(pd->chip[i].host_dev);
 645         }
 646         kfree(pd->chip);
 647 }
 648
 649 static int dsa_of_probe(struct device *dev)
 650 {
 651         struct device_node *np = dev->of_node;
 652         struct device_node *child, *mdio, *ethernet, *port;
 653         struct mii_bus *mdio_bus, *mdio_bus_switch;
 654         struct net_device *ethernet_dev;
 655         struct dsa_platform_data *pd;
 656         struct dsa_chip_data *cd;
 657         const char *port_name;
 658         int chip_index, port_index;
 659         const unsigned int *sw_addr, *port_reg;
 660         int gpio;
 661         enum of_gpio_flags of_flags;
 662         unsigned long flags;
 663         u32 eeprom_len;
 664         int ret;
 665
 666         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 667         if (!mdio)
 668                 return -EINVAL;
 669
 670         mdio_bus = of_mdio_find_bus(mdio);
 671         if (!mdio_bus)
 672                 return -EPROBE_DEFER;
 673
 674         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 675         if (!ethernet) {
 676                 ret = -EINVAL;
 677                 goto out_put_mdio;
 678         }
 679
 680         ethernet_dev = of_find_net_device_by_node(ethernet);
 681         if (!ethernet_dev) {
 682                 ret = -EPROBE_DEFER;
 683                 goto out_put_mdio;
 684         }
 685
 686         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 687         if (!pd) {
 688                 ret = -ENOMEM;
 689                 goto out_put_ethernet;
 690         }
 691
 692         dev->platform_data = pd;
 693         pd->of_netdev = ethernet_dev;
 694         pd->nr_chips = of_get_available_child_count(np);
 695         if (pd->nr_chips > DSA_MAX_SWITCHES)
 696                 pd->nr_chips = DSA_MAX_SWITCHES;
 697
 698         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 699                            GFP_KERNEL);
 700         if (!pd->chip) {
 701                 ret = -ENOMEM;
 702                 goto out_free;
 703         }
 704
 705         chip_index = -1;
 706         for_each_available_child_of_node(np, child) {
 707                 chip_index++;
 708                 cd = &pd->chip[chip_index];
 709
 710                 cd->of_node = child;
 711
 712                 /* When assigning the host device, increment its refcount */
 713                 cd->host_dev = get_device(&mdio_bus->dev);
 714
 715                 sw_addr = of_get_property(child, "reg", NULL);
 716                 if (!sw_addr)
 717                         continue;
 718
 719                 cd->sw_addr = be32_to_cpup(sw_addr);
 720                 if (cd->sw_addr >= PHY_MAX_ADDR)
 721                         continue;
 722
 723                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 724                         cd->eeprom_len = eeprom_len;
 725
 726                 mdio = of_parse_phandle(child, "mii-bus", 0);
 727                 if (mdio) {
 728                         mdio_bus_switch = of_mdio_find_bus(mdio);
 729                         if (!mdio_bus_switch) {
 730                                 ret = -EPROBE_DEFER;
 731                                 goto out_free_chip;
 732                         }
 733
 734                         /* Drop the mdio_bus device ref, replacing the host
 735                          * device with the mdio_bus_switch device, keeping
 736                          * the refcount from of_mdio_find_bus() above.
 737                          */
 738                         put_device(cd->host_dev);
 739                         cd->host_dev = &mdio_bus_switch->dev;
 740                 }
 741                 gpio = of_get_named_gpio_flags(child, "reset-gpios", 0,
 742                                                &of_flags);
 743                 if (gpio_is_valid(gpio)) {
 744                         flags = (of_flags == OF_GPIO_ACTIVE_LOW ?
 745                                  GPIOF_ACTIVE_LOW : 0);
 746                         ret = devm_gpio_request_one(dev, gpio, flags,
 747                                                     "switch_reset");
 748                         if (ret)
 749                                 goto out_free_chip;
 750
 751                         cd->reset = gpio_to_desc(gpio);
 752                         gpiod_direction_output(cd->reset, 0);
 753                 }
 754
 755                 for_each_available_child_of_node(child, port) {
 756                         port_reg = of_get_property(port, "reg", NULL);
 757                         if (!port_reg)
 758                                 continue;
 759
 760                         port_index = be32_to_cpup(port_reg);
 761                         if (port_index >= DSA_MAX_PORTS)
 762                                 break;
 763
 764                         port_name = of_get_property(port, "label", NULL);
 765                         if (!port_name)
 766                                 continue;
 767
 768                         cd->port_dn[port_index] = port;
 769
 770                         cd->port_names[port_index] = kstrdup(port_name,
 771                                         GFP_KERNEL);
 772                         if (!cd->port_names[port_index]) {
 773                                 ret = -ENOMEM;
 774                                 goto out_free_chip;
 775                         }
 776
 777                         ret = dsa_of_probe_links(pd, cd, chip_index,
 778                                                  port_index, port, port_name);
 779                         if (ret)
 780                                 goto out_free_chip;
 781
 782                 }
 783         }
 784
 785         /* The individual chips hold their own refcount on the mdio bus,
 786          * so drop ours */
 787         put_device(&mdio_bus->dev);
 788
 789         return 0;
 790
 791 out_free_chip:
 792         dsa_of_free_platform_data(pd);
 793 out_free:
 794         kfree(pd);
 795         dev->platform_data = NULL;
 796 out_put_ethernet:
 797         put_device(&ethernet_dev->dev);
 798 out_put_mdio:
 799         put_device(&mdio_bus->dev);
 800         return ret;
 801 }
 802
 803 static void dsa_of_remove(struct device *dev)
 804 {
 805         struct dsa_platform_data *pd = dev->platform_data;
 806
 807         if (!dev->of_node)
 808                 return;
 809
 810         dsa_of_free_platform_data(pd);
 811         put_device(&pd->of_netdev->dev);
 812         kfree(pd);
 813 }
 814 #else
 815 static inline int dsa_of_probe(struct device *dev)
 816 {
 817         return 0;
 818 }
 819
 820 static inline void dsa_of_remove(struct device *dev)
 821 {
 822 }
 823 #endif
 824
 825 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 826                          struct device *parent, struct dsa_platform_data *pd)
 827 {
 828         int i;
 829         unsigned configured = 0;
 830
 831         dst->pd = pd;
 832         dst->master_netdev = dev;
 833         dst->cpu_switch = -1;
 834         dst->cpu_port = -1;
 835
 836         for (i = 0; i < pd->nr_chips; i++) {
 837                 struct dsa_switch *ds;
 838
 839                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 840                 if (IS_ERR(ds)) {
 841                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 842                                    i, PTR_ERR(ds));
 843                         continue;
 844                 }
 845
 846                 dst->ds[i] = ds;
 847
 848                 ++configured;
 849         }
 850
 851         /*
 852          * If no switch was found, exit cleanly
 853          */
 854         if (!configured)
 855                 return -EPROBE_DEFER;
 856
 857         /*
 858          * If we use a tagging format that doesn't have an ethertype
 859          * field, make sure that all packets from this point on get
 860          * sent to the tag format's receive function.
 861          */
 862         wmb();
 863         dev->dsa_ptr = (void *)dst;
 864
 865         return 0;
 866 }
 867
 868 static int dsa_probe(struct platform_device *pdev)
 869 {
 870         struct dsa_platform_data *pd = pdev->dev.platform_data;
 871         struct net_device *dev;
 872         struct dsa_switch_tree *dst;
 873         int ret;
 874
 875         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 876                        dsa_driver_version);
 877
 878         if (pdev->dev.of_node) {
 879                 ret = dsa_of_probe(&pdev->dev);
 880                 if (ret)
 881                         return ret;
 882
 883                 pd = pdev->dev.platform_data;
 884         }
 885
 886         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 887                 return -EINVAL;
 888
 889         if (pd->of_netdev) {
 890                 dev = pd->of_netdev;
 891                 dev_hold(dev);
 892         } else {
 893                 dev = dev_to_net_device(pd->netdev);
 894         }
 895         if (dev == NULL) {
 896                 ret = -EPROBE_DEFER;
 897                 goto out;
 898         }
 899
 900         if (dev->dsa_ptr != NULL) {
 901                 dev_put(dev);
 902                 ret = -EEXIST;
 903                 goto out;
 904         }
 905
 906         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 907         if (dst == NULL) {
 908                 dev_put(dev);
 909                 ret = -ENOMEM;
 910                 goto out;
 911         }
 912
 913         platform_set_drvdata(pdev, dst);
 914
 915         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 916         if (ret) {
 917                 dev_put(dev);
 918                 goto out;
 919         }
 920
 921         return 0;
 922
 923 out:
 924         dsa_of_remove(&pdev->dev);
 925
 926         return ret;
 927 }
 928
 929 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 930 {
 931         int i;
 932
 933         dst->master_netdev->dsa_ptr = NULL;
 934
 935         /* If we used a tagging format that doesn't have an ethertype
 936          * field, make sure that all packets from this point get sent
 937          * without the tag and go through the regular receive path.
 938          */
 939         wmb();
 940
 941         for (i = 0; i < dst->pd->nr_chips; i++) {
 942                 struct dsa_switch *ds = dst->ds[i];
 943
 944                 if (ds)
 945                         dsa_switch_destroy(ds);
 946         }
 947
 948         dev_put(dst->master_netdev);
 949 }
 950
 951 static int dsa_remove(struct platform_device *pdev)
 952 {
 953         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 954
 955         dsa_remove_dst(dst);
 956         dsa_of_remove(&pdev->dev);
 957
 958         return 0;
 959 }
 960
 961 static void dsa_shutdown(struct platform_device *pdev)
 962 {
 963 }
 964
 965 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 966                           struct packet_type *pt, struct net_device *orig_dev)
 967 {
 968         struct dsa_switch_tree *dst = dev->dsa_ptr;
 969
 970         if (unlikely(dst == NULL)) {
 971                 kfree_skb(skb);
 972                 return 0;
 973         }
 974
 975         return dst->rcv(skb, dev, pt, orig_dev);
 976 }
 977
 978 static struct packet_type dsa_pack_type __read_mostly = {
 979         .type   = cpu_to_be16(ETH_P_XDSA),
 980         .func   = dsa_switch_rcv,
 981 };
 982
 983 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 984         .notifier_call  = dsa_slave_netdevice_event,
 985 };
 986
 987 #ifdef CONFIG_PM_SLEEP
 988 static int dsa_suspend(struct device *d)
 989 {
 990         struct platform_device *pdev = to_platform_device(d);
 991         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 992         int i, ret = 0;
 993
 994         for (i = 0; i < dst->pd->nr_chips; i++) {
 995                 struct dsa_switch *ds = dst->ds[i];
 996
 997                 if (ds != NULL)
 998                         ret = dsa_switch_suspend(ds);
 999         }
1000
1001         return ret;
1002 }
1003
1004 static int dsa_resume(struct device *d)
1005 {
1006         struct platform_device *pdev = to_platform_device(d);
1007         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1008         int i, ret = 0;
1009
1010         for (i = 0; i < dst->pd->nr_chips; i++) {
1011                 struct dsa_switch *ds = dst->ds[i];
1012
1013                 if (ds != NULL)
1014                         ret = dsa_switch_resume(ds);
1015         }
1016
1017         return ret;
1018 }
1019 #endif
1020
1021 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1022
1023 static const struct of_device_id dsa_of_match_table[] = {
1024         { .compatible = "brcm,bcm7445-switch-v4.0" },
1025         { .compatible = "marvell,dsa", },
1026         {}
1027 };
1028 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1029
1030 static struct platform_driver dsa_driver = {
1031         .probe          = dsa_probe,
1032         .remove         = dsa_remove,
1033         .shutdown       = dsa_shutdown,
1034         .driver = {
1035                 .name   = "dsa",
1036                 .of_match_table = dsa_of_match_table,
1037                 .pm     = &dsa_pm_ops,
1038         },
1039 };
1040
1041 static int __init dsa_init_module(void)
1042 {
1043         int rc;
1044
1045         register_netdevice_notifier(&dsa_netdevice_nb);
1046
1047         rc = platform_driver_register(&dsa_driver);
1048         if (rc)
1049                 return rc;
1050
1051         dev_add_pack(&dsa_pack_type);
1052
1053         return 0;
1054 }
1055 module_init(dsa_init_module);
1056
1057 static void __exit dsa_cleanup_module(void)
1058 {
1059         unregister_netdevice_notifier(&dsa_netdevice_nb);
1060         dev_remove_pack(&dsa_pack_type);
1061         platform_driver_unregister(&dsa_driver);
1062 }
1063 module_exit(dsa_cleanup_module);
1064
1065 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1066 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1067 MODULE_LICENSE("GPL");
1068 MODULE_ALIAS("platform:dsa");