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_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 180 {
 181         struct dsa_switch_driver *drv = ds->drv;
 182         struct dsa_switch_tree *dst = ds->dst;
 183         struct dsa_chip_data *pd = ds->pd;
 184         bool valid_name_found = false;
 185         int index = ds->index;
 186         int i, ret;
 187
 188         /*
 189          * Validate supplied switch configuration.
 190          */
 191         for (i = 0; i < DSA_MAX_PORTS; i++) {
 192                 char *name;
 193
 194                 name = pd->port_names[i];
 195                 if (name == NULL)
 196                         continue;
 197
 198                 if (!strcmp(name, "cpu")) {
 199                         if (dst->cpu_switch != -1) {
 200                                 netdev_err(dst->master_netdev,
 201                                            "multiple cpu ports?!\n");
 202                                 ret = -EINVAL;
 203                                 goto out;
 204                         }
 205                         dst->cpu_switch = index;
 206                         dst->cpu_port = i;
 207                 } else if (!strcmp(name, "dsa")) {
 208                         ds->dsa_port_mask |= 1 << i;
 209                 } else {
 210                         ds->phys_port_mask |= 1 << i;
 211                 }
 212                 valid_name_found = true;
 213         }
 214
 215         if (!valid_name_found && i == DSA_MAX_PORTS) {
 216                 ret = -EINVAL;
 217                 goto out;
 218         }
 219
 220         /* Make the built-in MII bus mask match the number of ports,
 221          * switch drivers can override this later
 222          */
 223         ds->phys_mii_mask = ds->phys_port_mask;
 224
 225         /*
 226          * If the CPU connects to this switch, set the switch tree
 227          * tagging protocol to the preferred tagging format of this
 228          * switch.
 229          */
 230         if (dst->cpu_switch == index) {
 231                 switch (ds->tag_protocol) {
 232 #ifdef CONFIG_NET_DSA_TAG_DSA
 233                 case DSA_TAG_PROTO_DSA:
 234                         dst->rcv = dsa_netdev_ops.rcv;
 235                         break;
 236 #endif
 237 #ifdef CONFIG_NET_DSA_TAG_EDSA
 238                 case DSA_TAG_PROTO_EDSA:
 239                         dst->rcv = edsa_netdev_ops.rcv;
 240                         break;
 241 #endif
 242 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 243                 case DSA_TAG_PROTO_TRAILER:
 244                         dst->rcv = trailer_netdev_ops.rcv;
 245                         break;
 246 #endif
 247 #ifdef CONFIG_NET_DSA_TAG_BRCM
 248                 case DSA_TAG_PROTO_BRCM:
 249                         dst->rcv = brcm_netdev_ops.rcv;
 250                         break;
 251 #endif
 252                 case DSA_TAG_PROTO_NONE:
 253                         break;
 254                 default:
 255                         ret = -ENOPROTOOPT;
 256                         goto out;
 257                 }
 258
 259                 dst->tag_protocol = ds->tag_protocol;
 260         }
 261
 262         /*
 263          * Do basic register setup.
 264          */
 265         ret = drv->setup(ds);
 266         if (ret < 0)
 267                 goto out;
 268
 269         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 270         if (ret < 0)
 271                 goto out;
 272
 273         ds->slave_mii_bus = mdiobus_alloc();
 274         if (ds->slave_mii_bus == NULL) {
 275                 ret = -ENOMEM;
 276                 goto out;
 277         }
 278         dsa_slave_mii_bus_init(ds);
 279
 280         ret = mdiobus_register(ds->slave_mii_bus);
 281         if (ret < 0)
 282                 goto out_free;
 283
 284
 285         /*
 286          * Create network devices for physical switch ports.
 287          */
 288         for (i = 0; i < DSA_MAX_PORTS; i++) {
 289                 if (!(ds->phys_port_mask & (1 << i)))
 290                         continue;
 291
 292                 ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
 293                 if (ret < 0) {
 294                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s)\n",
 295                                    index, i, pd->port_names[i]);
 296                         ret = 0;
 297                 }
 298         }
 299
 300 #ifdef CONFIG_NET_DSA_HWMON
 301         /* If the switch provides a temperature sensor,
 302          * register with hardware monitoring subsystem.
 303          * Treat registration error as non-fatal and ignore it.
 304          */
 305         if (drv->get_temp) {
 306                 const char *netname = netdev_name(dst->master_netdev);
 307                 char hname[IFNAMSIZ + 1];
 308                 int i, j;
 309
 310                 /* Create valid hwmon 'name' attribute */
 311                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 312                         if (isalnum(netname[i]))
 313                                 hname[j++] = netname[i];
 314                 }
 315                 hname[j] = '\0';
 316                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 317                           hname, index);
 318                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 319                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 320                 if (IS_ERR(ds->hwmon_dev))
 321                         ds->hwmon_dev = NULL;
 322         }
 323 #endif /* CONFIG_NET_DSA_HWMON */
 324
 325         return ret;
 326
 327 out_free:
 328         mdiobus_free(ds->slave_mii_bus);
 329 out:
 330         kfree(ds);
 331         return ret;
 332 }
 333
 334 static struct dsa_switch *
 335 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 336                  struct device *parent, struct device *host_dev)
 337 {
 338         struct dsa_chip_data *pd = dst->pd->chip + index;
 339         struct dsa_switch_driver *drv;
 340         struct dsa_switch *ds;
 341         int ret;
 342         char *name;
 343
 344         /*
 345          * Probe for switch model.
 346          */
 347         drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
 348         if (drv == NULL) {
 349                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 350                            index);
 351                 return ERR_PTR(-EINVAL);
 352         }
 353         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 354                     index, name);
 355
 356
 357         /*
 358          * Allocate and initialise switch state.
 359          */
 360         ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
 361         if (ds == NULL)
 362                 return ERR_PTR(-ENOMEM);
 363
 364         ds->dst = dst;
 365         ds->index = index;
 366         ds->pd = pd;
 367         ds->drv = drv;
 368         ds->tag_protocol = drv->tag_protocol;
 369         ds->master_dev = host_dev;
 370
 371         ret = dsa_switch_setup_one(ds, parent);
 372         if (ret)
 373                 return ERR_PTR(ret);
 374
 375         return ds;
 376 }
 377
 378 static void dsa_switch_destroy(struct dsa_switch *ds)
 379 {
 380 #ifdef CONFIG_NET_DSA_HWMON
 381         if (ds->hwmon_dev)
 382                 hwmon_device_unregister(ds->hwmon_dev);
 383 #endif
 384 }
 385
 386 #ifdef CONFIG_PM_SLEEP
 387 static int dsa_switch_suspend(struct dsa_switch *ds)
 388 {
 389         int i, ret = 0;
 390
 391         /* Suspend slave network devices */
 392         for (i = 0; i < DSA_MAX_PORTS; i++) {
 393                 if (!dsa_is_port_initialized(ds, i))
 394                         continue;
 395
 396                 ret = dsa_slave_suspend(ds->ports[i]);
 397                 if (ret)
 398                         return ret;
 399         }
 400
 401         if (ds->drv->suspend)
 402                 ret = ds->drv->suspend(ds);
 403
 404         return ret;
 405 }
 406
 407 static int dsa_switch_resume(struct dsa_switch *ds)
 408 {
 409         int i, ret = 0;
 410
 411         if (ds->drv->resume)
 412                 ret = ds->drv->resume(ds);
 413
 414         if (ret)
 415                 return ret;
 416
 417         /* Resume slave network devices */
 418         for (i = 0; i < DSA_MAX_PORTS; i++) {
 419                 if (!dsa_is_port_initialized(ds, i))
 420                         continue;
 421
 422                 ret = dsa_slave_resume(ds->ports[i]);
 423                 if (ret)
 424                         return ret;
 425         }
 426
 427         return 0;
 428 }
 429 #endif
 430
 431
 432 /* link polling *************************************************************/
 433 static void dsa_link_poll_work(struct work_struct *ugly)
 434 {
 435         struct dsa_switch_tree *dst;
 436         int i;
 437
 438         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
 439
 440         for (i = 0; i < dst->pd->nr_chips; i++) {
 441                 struct dsa_switch *ds = dst->ds[i];
 442
 443                 if (ds != NULL && ds->drv->poll_link != NULL)
 444                         ds->drv->poll_link(ds);
 445         }
 446
 447         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
 448 }
 449
 450 static void dsa_link_poll_timer(unsigned long _dst)
 451 {
 452         struct dsa_switch_tree *dst = (void *)_dst;
 453
 454         schedule_work(&dst->link_poll_work);
 455 }
 456
 457
 458 /* platform driver init and cleanup *****************************************/
 459 static int dev_is_class(struct device *dev, void *class)
 460 {
 461         if (dev->class != NULL && !strcmp(dev->class->name, class))
 462                 return 1;
 463
 464         return 0;
 465 }
 466
 467 static struct device *dev_find_class(struct device *parent, char *class)
 468 {
 469         if (dev_is_class(parent, class)) {
 470                 get_device(parent);
 471                 return parent;
 472         }
 473
 474         return device_find_child(parent, class, dev_is_class);
 475 }
 476
 477 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 478 {
 479         struct device *d;
 480
 481         d = dev_find_class(dev, "mdio_bus");
 482         if (d != NULL) {
 483                 struct mii_bus *bus;
 484
 485                 bus = to_mii_bus(d);
 486                 put_device(d);
 487
 488                 return bus;
 489         }
 490
 491         return NULL;
 492 }
 493 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 494
 495 static struct net_device *dev_to_net_device(struct device *dev)
 496 {
 497         struct device *d;
 498
 499         d = dev_find_class(dev, "net");
 500         if (d != NULL) {
 501                 struct net_device *nd;
 502
 503                 nd = to_net_dev(d);
 504                 dev_hold(nd);
 505                 put_device(d);
 506
 507                 return nd;
 508         }
 509
 510         return NULL;
 511 }
 512
 513 #ifdef CONFIG_OF
 514 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 515                                         struct dsa_chip_data *cd,
 516                                         int chip_index, int port_index,
 517                                         struct device_node *link)
 518 {
 519         const __be32 *reg;
 520         int link_sw_addr;
 521         struct device_node *parent_sw;
 522         int len;
 523
 524         parent_sw = of_get_parent(link);
 525         if (!parent_sw)
 526                 return -EINVAL;
 527
 528         reg = of_get_property(parent_sw, "reg", &len);
 529         if (!reg || (len != sizeof(*reg) * 2))
 530                 return -EINVAL;
 531
 532         /*
 533          * Get the destination switch number from the second field of its 'reg'
 534          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 535          */
 536         link_sw_addr = be32_to_cpup(reg + 1);
 537
 538         if (link_sw_addr >= pd->nr_chips)
 539                 return -EINVAL;
 540
 541         /* First time routing table allocation */
 542         if (!cd->rtable) {
 543                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
 544                                            GFP_KERNEL);
 545                 if (!cd->rtable)
 546                         return -ENOMEM;
 547
 548                 /* default to no valid uplink/downlink */
 549                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
 550         }
 551
 552         cd->rtable[link_sw_addr] = port_index;
 553
 554         return 0;
 555 }
 556
 557 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 558 {
 559         int i;
 560         int port_index;
 561
 562         for (i = 0; i < pd->nr_chips; i++) {
 563                 port_index = 0;
 564                 while (port_index < DSA_MAX_PORTS) {
 565                         kfree(pd->chip[i].port_names[port_index]);
 566                         port_index++;
 567                 }
 568                 kfree(pd->chip[i].rtable);
 569         }
 570         kfree(pd->chip);
 571 }
 572
 573 static int dsa_of_probe(struct device *dev)
 574 {
 575         struct device_node *np = dev->of_node;
 576         struct device_node *child, *mdio, *ethernet, *port, *link;
 577         struct mii_bus *mdio_bus;
 578         struct net_device *ethernet_dev;
 579         struct dsa_platform_data *pd;
 580         struct dsa_chip_data *cd;
 581         const char *port_name;
 582         int chip_index, port_index;
 583         const unsigned int *sw_addr, *port_reg;
 584         u32 eeprom_len;
 585         int ret;
 586
 587         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 588         if (!mdio)
 589                 return -EINVAL;
 590
 591         mdio_bus = of_mdio_find_bus(mdio);
 592         if (!mdio_bus)
 593                 return -EPROBE_DEFER;
 594
 595         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 596         if (!ethernet)
 597                 return -EINVAL;
 598
 599         ethernet_dev = of_find_net_device_by_node(ethernet);
 600         if (!ethernet_dev)
 601                 return -EPROBE_DEFER;
 602
 603         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 604         if (!pd)
 605                 return -ENOMEM;
 606
 607         dev->platform_data = pd;
 608         pd->of_netdev = ethernet_dev;
 609         pd->nr_chips = of_get_available_child_count(np);
 610         if (pd->nr_chips > DSA_MAX_SWITCHES)
 611                 pd->nr_chips = DSA_MAX_SWITCHES;
 612
 613         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 614                            GFP_KERNEL);
 615         if (!pd->chip) {
 616                 ret = -ENOMEM;
 617                 goto out_free;
 618         }
 619
 620         chip_index = -1;
 621         for_each_available_child_of_node(np, child) {
 622                 chip_index++;
 623                 cd = &pd->chip[chip_index];
 624
 625                 cd->of_node = child;
 626                 cd->host_dev = &mdio_bus->dev;
 627
 628                 sw_addr = of_get_property(child, "reg", NULL);
 629                 if (!sw_addr)
 630                         continue;
 631
 632                 cd->sw_addr = be32_to_cpup(sw_addr);
 633                 if (cd->sw_addr > PHY_MAX_ADDR)
 634                         continue;
 635
 636                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 637                         cd->eeprom_len = eeprom_len;
 638
 639                 for_each_available_child_of_node(child, port) {
 640                         port_reg = of_get_property(port, "reg", NULL);
 641                         if (!port_reg)
 642                                 continue;
 643
 644                         port_index = be32_to_cpup(port_reg);
 645
 646                         port_name = of_get_property(port, "label", NULL);
 647                         if (!port_name)
 648                                 continue;
 649
 650                         cd->port_dn[port_index] = port;
 651
 652                         cd->port_names[port_index] = kstrdup(port_name,
 653                                         GFP_KERNEL);
 654                         if (!cd->port_names[port_index]) {
 655                                 ret = -ENOMEM;
 656                                 goto out_free_chip;
 657                         }
 658
 659                         link = of_parse_phandle(port, "link", 0);
 660
 661                         if (!strcmp(port_name, "dsa") && link &&
 662                                         pd->nr_chips > 1) {
 663                                 ret = dsa_of_setup_routing_table(pd, cd,
 664                                                 chip_index, port_index, link);
 665                                 if (ret)
 666                                         goto out_free_chip;
 667                         }
 668
 669                         if (port_index == DSA_MAX_PORTS)
 670                                 break;
 671                 }
 672         }
 673
 674         return 0;
 675
 676 out_free_chip:
 677         dsa_of_free_platform_data(pd);
 678 out_free:
 679         kfree(pd);
 680         dev->platform_data = NULL;
 681         return ret;
 682 }
 683
 684 static void dsa_of_remove(struct device *dev)
 685 {
 686         struct dsa_platform_data *pd = dev->platform_data;
 687
 688         if (!dev->of_node)
 689                 return;
 690
 691         dsa_of_free_platform_data(pd);
 692         kfree(pd);
 693 }
 694 #else
 695 static inline int dsa_of_probe(struct device *dev)
 696 {
 697         return 0;
 698 }
 699
 700 static inline void dsa_of_remove(struct device *dev)
 701 {
 702 }
 703 #endif
 704
 705 static void dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 706                           struct device *parent, struct dsa_platform_data *pd)
 707 {
 708         int i;
 709
 710         dst->pd = pd;
 711         dst->master_netdev = dev;
 712         dst->cpu_switch = -1;
 713         dst->cpu_port = -1;
 714
 715         for (i = 0; i < pd->nr_chips; i++) {
 716                 struct dsa_switch *ds;
 717
 718                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 719                 if (IS_ERR(ds)) {
 720                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 721                                    i, PTR_ERR(ds));
 722                         continue;
 723                 }
 724
 725                 dst->ds[i] = ds;
 726                 if (ds->drv->poll_link != NULL)
 727                         dst->link_poll_needed = 1;
 728         }
 729
 730         /*
 731          * If we use a tagging format that doesn't have an ethertype
 732          * field, make sure that all packets from this point on get
 733          * sent to the tag format's receive function.
 734          */
 735         wmb();
 736         dev->dsa_ptr = (void *)dst;
 737
 738         if (dst->link_poll_needed) {
 739                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
 740                 init_timer(&dst->link_poll_timer);
 741                 dst->link_poll_timer.data = (unsigned long)dst;
 742                 dst->link_poll_timer.function = dsa_link_poll_timer;
 743                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
 744                 add_timer(&dst->link_poll_timer);
 745         }
 746 }
 747
 748 static int dsa_probe(struct platform_device *pdev)
 749 {
 750         struct dsa_platform_data *pd = pdev->dev.platform_data;
 751         struct net_device *dev;
 752         struct dsa_switch_tree *dst;
 753         int ret;
 754
 755         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 756                        dsa_driver_version);
 757
 758         if (pdev->dev.of_node) {
 759                 ret = dsa_of_probe(&pdev->dev);
 760                 if (ret)
 761                         return ret;
 762
 763                 pd = pdev->dev.platform_data;
 764         }
 765
 766         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 767                 return -EINVAL;
 768
 769         if (pd->of_netdev) {
 770                 dev = pd->of_netdev;
 771                 dev_hold(dev);
 772         } else {
 773                 dev = dev_to_net_device(pd->netdev);
 774         }
 775         if (dev == NULL) {
 776                 ret = -EPROBE_DEFER;
 777                 goto out;
 778         }
 779
 780         if (dev->dsa_ptr != NULL) {
 781                 dev_put(dev);
 782                 ret = -EEXIST;
 783                 goto out;
 784         }
 785
 786         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
 787         if (dst == NULL) {
 788                 dev_put(dev);
 789                 ret = -ENOMEM;
 790                 goto out;
 791         }
 792
 793         platform_set_drvdata(pdev, dst);
 794
 795         dsa_setup_dst(dst, dev, &pdev->dev, pd);
 796
 797         return 0;
 798
 799 out:
 800         dsa_of_remove(&pdev->dev);
 801
 802         return ret;
 803 }
 804
 805 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 806 {
 807         int i;
 808
 809         if (dst->link_poll_needed)
 810                 del_timer_sync(&dst->link_poll_timer);
 811
 812         flush_work(&dst->link_poll_work);
 813
 814         for (i = 0; i < dst->pd->nr_chips; i++) {
 815                 struct dsa_switch *ds = dst->ds[i];
 816
 817                 if (ds != NULL)
 818                         dsa_switch_destroy(ds);
 819         }
 820 }
 821
 822 static int dsa_remove(struct platform_device *pdev)
 823 {
 824         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 825
 826         dsa_remove_dst(dst);
 827         dsa_of_remove(&pdev->dev);
 828
 829         return 0;
 830 }
 831
 832 static void dsa_shutdown(struct platform_device *pdev)
 833 {
 834 }
 835
 836 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 837                           struct packet_type *pt, struct net_device *orig_dev)
 838 {
 839         struct dsa_switch_tree *dst = dev->dsa_ptr;
 840
 841         if (unlikely(dst == NULL)) {
 842                 kfree_skb(skb);
 843                 return 0;
 844         }
 845
 846         return dst->rcv(skb, dev, pt, orig_dev);
 847 }
 848
 849 static struct packet_type dsa_pack_type __read_mostly = {
 850         .type   = cpu_to_be16(ETH_P_XDSA),
 851         .func   = dsa_switch_rcv,
 852 };
 853
 854 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 855         .notifier_call  = dsa_slave_netdevice_event,
 856 };
 857
 858 #ifdef CONFIG_PM_SLEEP
 859 static int dsa_suspend(struct device *d)
 860 {
 861         struct platform_device *pdev = to_platform_device(d);
 862         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 863         int i, ret = 0;
 864
 865         for (i = 0; i < dst->pd->nr_chips; i++) {
 866                 struct dsa_switch *ds = dst->ds[i];
 867
 868                 if (ds != NULL)
 869                         ret = dsa_switch_suspend(ds);
 870         }
 871
 872         return ret;
 873 }
 874
 875 static int dsa_resume(struct device *d)
 876 {
 877         struct platform_device *pdev = to_platform_device(d);
 878         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 879         int i, ret = 0;
 880
 881         for (i = 0; i < dst->pd->nr_chips; i++) {
 882                 struct dsa_switch *ds = dst->ds[i];
 883
 884                 if (ds != NULL)
 885                         ret = dsa_switch_resume(ds);
 886         }
 887
 888         return ret;
 889 }
 890 #endif
 891
 892 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 893
 894 static const struct of_device_id dsa_of_match_table[] = {
 895         { .compatible = "brcm,bcm7445-switch-v4.0" },
 896         { .compatible = "marvell,dsa", },
 897         {}
 898 };
 899 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
 900
 901 static struct platform_driver dsa_driver = {
 902         .probe          = dsa_probe,
 903         .remove         = dsa_remove,
 904         .shutdown       = dsa_shutdown,
 905         .driver = {
 906                 .name   = "dsa",
 907                 .of_match_table = dsa_of_match_table,
 908                 .pm     = &dsa_pm_ops,
 909         },
 910 };
 911
 912 static int __init dsa_init_module(void)
 913 {
 914         int rc;
 915
 916         register_netdevice_notifier(&dsa_netdevice_nb);
 917
 918         rc = platform_driver_register(&dsa_driver);
 919         if (rc)
 920                 return rc;
 921
 922         dev_add_pack(&dsa_pack_type);
 923
 924         return 0;
 925 }
 926 module_init(dsa_init_module);
 927
 928 static void __exit dsa_cleanup_module(void)
 929 {
 930         unregister_netdevice_notifier(&dsa_netdevice_nb);
 931         dev_remove_pack(&dsa_pack_type);
 932         platform_driver_unregister(&dsa_driver);
 933 }
 934 module_exit(dsa_cleanup_module);
 935
 936 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 937 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
 938 MODULE_LICENSE("GPL");
 939 MODULE_ALIAS("platform:dsa");