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/sysfs.h>
  24 #include "dsa_priv.h"
  25
  26 char dsa_driver_version[] = "0.1";
  27
  28
  29 /* switch driver registration ***********************************************/
  30 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  31 static LIST_HEAD(dsa_switch_drivers);
  32
  33 void register_switch_driver(struct dsa_switch_driver *drv)
  34 {
  35         mutex_lock(&dsa_switch_drivers_mutex);
  36         list_add_tail(&drv->list, &dsa_switch_drivers);
  37         mutex_unlock(&dsa_switch_drivers_mutex);
  38 }
  39 EXPORT_SYMBOL_GPL(register_switch_driver);
  40
  41 void unregister_switch_driver(struct dsa_switch_driver *drv)
  42 {
  43         mutex_lock(&dsa_switch_drivers_mutex);
  44         list_del_init(&drv->list);
  45         mutex_unlock(&dsa_switch_drivers_mutex);
  46 }
  47 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  48
  49 static struct dsa_switch_driver *
  50 dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
  51 {
  52         struct dsa_switch_driver *ret;
  53         struct list_head *list;
  54         char *name;
  55
  56         ret = NULL;
  57         name = NULL;
  58
  59         mutex_lock(&dsa_switch_drivers_mutex);
  60         list_for_each(list, &dsa_switch_drivers) {
  61                 struct dsa_switch_driver *drv;
  62
  63                 drv = list_entry(list, struct dsa_switch_driver, list);
  64
  65                 name = drv->probe(host_dev, sw_addr);
  66                 if (name != NULL) {
  67                         ret = drv;
  68                         break;
  69                 }
  70         }
  71         mutex_unlock(&dsa_switch_drivers_mutex);
  72
  73         *_name = name;
  74
  75         return ret;
  76 }
  77
  78 /* hwmon support ************************************************************/
  79
  80 #ifdef CONFIG_NET_DSA_HWMON
  81
  82 static ssize_t temp1_input_show(struct device *dev,
  83                                 struct device_attribute *attr, char *buf)
  84 {
  85         struct dsa_switch *ds = dev_get_drvdata(dev);
  86         int temp, ret;
  87
  88         ret = ds->drv->get_temp(ds, &temp);
  89         if (ret < 0)
  90                 return ret;
  91
  92         return sprintf(buf, "%d\n", temp * 1000);
  93 }
  94 static DEVICE_ATTR_RO(temp1_input);
  95
  96 static ssize_t temp1_max_show(struct device *dev,
  97                               struct device_attribute *attr, char *buf)
  98 {
  99         struct dsa_switch *ds = dev_get_drvdata(dev);
 100         int temp, ret;
 101
 102         ret = ds->drv->get_temp_limit(ds, &temp);
 103         if (ret < 0)
 104                 return ret;
 105
 106         return sprintf(buf, "%d\n", temp * 1000);
 107 }
 108
 109 static ssize_t temp1_max_store(struct device *dev,
 110                                struct device_attribute *attr, const char *buf,
 111                                size_t count)
 112 {
 113         struct dsa_switch *ds = dev_get_drvdata(dev);
 114         int temp, ret;
 115
 116         ret = kstrtoint(buf, 0, &temp);
 117         if (ret < 0)
 118                 return ret;
 119
 120         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 121         if (ret < 0)
 122                 return ret;
 123
 124         return count;
 125 }
 126 static DEVICE_ATTR(temp1_max, S_IRUGO, temp1_max_show, temp1_max_store);
 127
 128 static ssize_t temp1_max_alarm_show(struct device *dev,
 129                                     struct device_attribute *attr, char *buf)
 130 {
 131         struct dsa_switch *ds = dev_get_drvdata(dev);
 132         bool alarm;
 133         int ret;
 134
 135         ret = ds->drv->get_temp_alarm(ds, &alarm);
 136         if (ret < 0)
 137                 return ret;
 138
 139         return sprintf(buf, "%d\n", alarm);
 140 }
 141 static DEVICE_ATTR_RO(temp1_max_alarm);
 142
 143 static struct attribute *dsa_hwmon_attrs[] = {
 144         &dev_attr_temp1_input.attr,     /* 0 */
 145         &dev_attr_temp1_max.attr,       /* 1 */
 146         &dev_attr_temp1_max_alarm.attr, /* 2 */
 147         NULL
 148 };
 149
 150 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 151                                        struct attribute *attr, int index)
 152 {
 153         struct device *dev = container_of(kobj, struct device, kobj);
 154         struct dsa_switch *ds = dev_get_drvdata(dev);
 155         struct dsa_switch_driver *drv = ds->drv;
 156         umode_t mode = attr->mode;
 157
 158         if (index == 1) {
 159                 if (!drv->get_temp_limit)
 160                         mode = 0;
 161                 else if (drv->set_temp_limit)
 162                         mode |= S_IWUSR;
 163         } else if (index == 2 && !drv->get_temp_alarm) {
 164                 mode = 0;
 165         }
 166         return mode;
 167 }
 168
 169 static const struct attribute_group dsa_hwmon_group = {
 170         .attrs = dsa_hwmon_attrs,
 171         .is_visible = dsa_hwmon_attrs_visible,
 172 };
 173 __ATTRIBUTE_GROUPS(dsa_hwmon);
 174
 175 #endif /* CONFIG_NET_DSA_HWMON */
 176
 177 /* basic switch operations **************************************************/
 178 static struct dsa_switch *
 179 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 180                  struct device *parent, struct device *host_dev)
 181 {
 182         struct dsa_chip_data *pd = dst->pd->chip + index;
 183         struct dsa_switch_driver *drv;
 184         struct dsa_switch *ds;
 185         int ret;
 186         char *name;
 187         int i;
 188         bool valid_name_found = false;
 189
 190         /*
 191          * Probe for switch model.
 192          */
 193         drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
 194         if (drv == NULL) {
 195                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 196                            index);
 197                 return ERR_PTR(-EINVAL);
 198         }
 199         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 200                     index, name);
 201
 202
 203         /*
 204          * Allocate and initialise switch state.
 205          */
 206         ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
 207         if (ds == NULL)
 208                 return ERR_PTR(-ENOMEM);
 209
 210         ds->dst = dst;
 211         ds->index = index;
 212         ds->pd = dst->pd->chip + index;
 213         ds->drv = drv;
 214         ds->master_dev = host_dev;
 215
 216         /*
 217          * Validate supplied switch configuration.
 218          */
 219         for (i = 0; i < DSA_MAX_PORTS; i++) {
 220                 char *name;
 221
 222                 name = pd->port_names[i];
 223                 if (name == NULL)
 224                         continue;
 225
 226                 if (!strcmp(name, "cpu")) {
 227                         if (dst->cpu_switch != -1) {
 228                                 netdev_err(dst->master_netdev,
 229                                            "multiple cpu ports?!\n");
 230                                 ret = -EINVAL;
 231                                 goto out;
 232                         }
 233                         dst->cpu_switch = index;
 234                         dst->cpu_port = i;
 235                 } else if (!strcmp(name, "dsa")) {
 236                         ds->dsa_port_mask |= 1 << i;
 237                 } else {
 238                         ds->phys_port_mask |= 1 << i;
 239                 }
 240                 valid_name_found = true;
 241         }
 242
 243         if (!valid_name_found && i == DSA_MAX_PORTS) {
 244                 ret = -EINVAL;
 245                 goto out;
 246         }
 247
 248         /* Make the built-in MII bus mask match the number of ports,
 249          * switch drivers can override this later
 250          */
 251         ds->phys_mii_mask = ds->phys_port_mask;
 252
 253         /*
 254          * If the CPU connects to this switch, set the switch tree
 255          * tagging protocol to the preferred tagging format of this
 256          * switch.
 257          */
 258         if (dst->cpu_switch == index) {
 259                 switch (drv->tag_protocol) {
 260 #ifdef CONFIG_NET_DSA_TAG_DSA
 261                 case DSA_TAG_PROTO_DSA:
 262                         dst->rcv = dsa_netdev_ops.rcv;
 263                         break;
 264 #endif
 265 #ifdef CONFIG_NET_DSA_TAG_EDSA
 266                 case DSA_TAG_PROTO_EDSA:
 267                         dst->rcv = edsa_netdev_ops.rcv;
 268                         break;
 269 #endif
 270 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 271                 case DSA_TAG_PROTO_TRAILER:
 272                         dst->rcv = trailer_netdev_ops.rcv;
 273                         break;
 274 #endif
 275 #ifdef CONFIG_NET_DSA_TAG_BRCM
 276                 case DSA_TAG_PROTO_BRCM:
 277                         dst->rcv = brcm_netdev_ops.rcv;
 278                         break;
 279 #endif
 280                 case DSA_TAG_PROTO_NONE:
 281                         break;
 282                 default:
 283                         ret = -ENOPROTOOPT;
 284                         goto out;
 285                 }
 286
 287                 dst->tag_protocol = drv->tag_protocol;
 288         }
 289
 290         /*
 291          * Do basic register setup.
 292          */
 293         ret = drv->setup(ds);
 294         if (ret < 0)
 295                 goto out;
 296
 297         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 298         if (ret < 0)
 299                 goto out;
 300
 301         ds->slave_mii_bus = mdiobus_alloc();
 302         if (ds->slave_mii_bus == NULL) {
 303                 ret = -ENOMEM;
 304                 goto out;
 305         }
 306         dsa_slave_mii_bus_init(ds);
 307
 308         ret = mdiobus_register(ds->slave_mii_bus);
 309         if (ret < 0)
 310                 goto out_free;
 311
 312
 313         /*
 314          * Create network devices for physical switch ports.
 315          */
 316         for (i = 0; i < DSA_MAX_PORTS; i++) {
 317                 if (!(ds->phys_port_mask & (1 << i)))
 318                         continue;
 319
 320                 ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
 321                 if (ret < 0) {
 322                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s)\n",
 323                                    index, i, pd->port_names[i]);
 324                         ret = 0;
 325                 }
 326         }
 327
 328 #ifdef CONFIG_NET_DSA_HWMON
 329         /* If the switch provides a temperature sensor,
 330          * register with hardware monitoring subsystem.
 331          * Treat registration error as non-fatal and ignore it.
 332          */
 333         if (drv->get_temp) {
 334                 const char *netname = netdev_name(dst->master_netdev);
 335                 char hname[IFNAMSIZ + 1];
 336                 int i, j;
 337
 338                 /* Create valid hwmon 'name' attribute */
 339                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 340                         if (isalnum(netname[i]))
 341                                 hname[j++] = netname[i];
 342                 }
 343                 hname[j] = '\0';
 344                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 345                           hname, index);
 346                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 347                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 348                 if (IS_ERR(ds->hwmon_dev))
 349                         ds->hwmon_dev = NULL;
 350         }
 351 #endif /* CONFIG_NET_DSA_HWMON */
 352
 353         return ds;
 354
 355 out_free:
 356         mdiobus_free(ds->slave_mii_bus);
 357 out:
 358         kfree(ds);
 359         return ERR_PTR(ret);
 360 }
 361
 362 static void dsa_switch_destroy(struct dsa_switch *ds)
 363 {
 364 #ifdef CONFIG_NET_DSA_HWMON
 365         if (ds->hwmon_dev)
 366                 hwmon_device_unregister(ds->hwmon_dev);
 367 #endif
 368 }
 369
 370 #ifdef CONFIG_PM_SLEEP
 371 static int dsa_switch_suspend(struct dsa_switch *ds)
 372 {
 373         int i, ret = 0;
 374
 375         /* Suspend slave network devices */
 376         for (i = 0; i < DSA_MAX_PORTS; i++) {
 377                 if (!dsa_is_port_initialized(ds, i))
 378                         continue;
 379
 380                 ret = dsa_slave_suspend(ds->ports[i]);
 381                 if (ret)
 382                         return ret;
 383         }
 384
 385         if (ds->drv->suspend)
 386                 ret = ds->drv->suspend(ds);
 387
 388         return ret;
 389 }
 390
 391 static int dsa_switch_resume(struct dsa_switch *ds)
 392 {
 393         int i, ret = 0;
 394
 395         if (ds->drv->resume)
 396                 ret = ds->drv->resume(ds);
 397
 398         if (ret)
 399                 return ret;
 400
 401         /* Resume slave network devices */
 402         for (i = 0; i < DSA_MAX_PORTS; i++) {
 403                 if (!dsa_is_port_initialized(ds, i))
 404                         continue;
 405
 406                 ret = dsa_slave_resume(ds->ports[i]);
 407                 if (ret)
 408                         return ret;
 409         }
 410
 411         return 0;
 412 }
 413 #endif
 414
 415
 416 /* link polling *************************************************************/
 417 static void dsa_link_poll_work(struct work_struct *ugly)
 418 {
 419         struct dsa_switch_tree *dst;
 420         int i;
 421
 422         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
 423
 424         for (i = 0; i < dst->pd->nr_chips; i++) {
 425                 struct dsa_switch *ds = dst->ds[i];
 426
 427                 if (ds != NULL && ds->drv->poll_link != NULL)
 428                         ds->drv->poll_link(ds);
 429         }
 430
 431         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
 432 }
 433
 434 static void dsa_link_poll_timer(unsigned long _dst)
 435 {
 436         struct dsa_switch_tree *dst = (void *)_dst;
 437
 438         schedule_work(&dst->link_poll_work);
 439 }
 440
 441
 442 /* platform driver init and cleanup *****************************************/
 443 static int dev_is_class(struct device *dev, void *class)
 444 {
 445         if (dev->class != NULL && !strcmp(dev->class->name, class))
 446                 return 1;
 447
 448         return 0;
 449 }
 450
 451 static struct device *dev_find_class(struct device *parent, char *class)
 452 {
 453         if (dev_is_class(parent, class)) {
 454                 get_device(parent);
 455                 return parent;
 456         }
 457
 458         return device_find_child(parent, class, dev_is_class);
 459 }
 460
 461 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 462 {
 463         struct device *d;
 464
 465         d = dev_find_class(dev, "mdio_bus");
 466         if (d != NULL) {
 467                 struct mii_bus *bus;
 468
 469                 bus = to_mii_bus(d);
 470                 put_device(d);
 471
 472                 return bus;
 473         }
 474
 475         return NULL;
 476 }
 477 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 478
 479 static struct net_device *dev_to_net_device(struct device *dev)
 480 {
 481         struct device *d;
 482
 483         d = dev_find_class(dev, "net");
 484         if (d != NULL) {
 485                 struct net_device *nd;
 486
 487                 nd = to_net_dev(d);
 488                 dev_hold(nd);
 489                 put_device(d);
 490
 491                 return nd;
 492         }
 493
 494         return NULL;
 495 }
 496
 497 #ifdef CONFIG_OF
 498 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 499                                         struct dsa_chip_data *cd,
 500                                         int chip_index,
 501                                         struct device_node *link)
 502 {
 503         int ret;
 504         const __be32 *reg;
 505         int link_port_addr;
 506         int link_sw_addr;
 507         struct device_node *parent_sw;
 508         int len;
 509
 510         parent_sw = of_get_parent(link);
 511         if (!parent_sw)
 512                 return -EINVAL;
 513
 514         reg = of_get_property(parent_sw, "reg", &len);
 515         if (!reg || (len != sizeof(*reg) * 2))
 516                 return -EINVAL;
 517
 518         link_sw_addr = be32_to_cpup(reg + 1);
 519
 520         if (link_sw_addr >= pd->nr_chips)
 521                 return -EINVAL;
 522
 523         /* First time routing table allocation */
 524         if (!cd->rtable) {
 525                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
 526                                            GFP_KERNEL);
 527                 if (!cd->rtable)
 528                         return -ENOMEM;
 529
 530                 /* default to no valid uplink/downlink */
 531                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
 532         }
 533
 534         reg = of_get_property(link, "reg", NULL);
 535         if (!reg) {
 536                 ret = -EINVAL;
 537                 goto out;
 538         }
 539
 540         link_port_addr = be32_to_cpup(reg);
 541
 542         cd->rtable[link_sw_addr] = link_port_addr;
 543
 544         return 0;
 545 out:
 546         kfree(cd->rtable);
 547         return ret;
 548 }
 549
 550 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 551 {
 552         int i;
 553         int port_index;
 554
 555         for (i = 0; i < pd->nr_chips; i++) {
 556                 port_index = 0;
 557                 while (port_index < DSA_MAX_PORTS) {
 558                         kfree(pd->chip[i].port_names[port_index]);
 559                         port_index++;
 560                 }
 561                 kfree(pd->chip[i].rtable);
 562         }
 563         kfree(pd->chip);
 564 }
 565
 566 static int dsa_of_probe(struct device *dev)
 567 {
 568         struct device_node *np = dev->of_node;
 569         struct device_node *child, *mdio, *ethernet, *port, *link;
 570         struct mii_bus *mdio_bus;
 571         struct platform_device *ethernet_dev;
 572         struct dsa_platform_data *pd;
 573         struct dsa_chip_data *cd;
 574         const char *port_name;
 575         int chip_index, port_index;
 576         const unsigned int *sw_addr, *port_reg;
 577         u32 eeprom_len;
 578         int ret;
 579
 580         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 581         if (!mdio)
 582                 return -EINVAL;
 583
 584         mdio_bus = of_mdio_find_bus(mdio);
 585         if (!mdio_bus)
 586                 return -EPROBE_DEFER;
 587
 588         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 589         if (!ethernet)
 590                 return -EINVAL;
 591
 592         ethernet_dev = of_find_device_by_node(ethernet);
 593         if (!ethernet_dev)
 594                 return -EPROBE_DEFER;
 595
 596         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 597         if (!pd)
 598                 return -ENOMEM;
 599
 600         dev->platform_data = pd;
 601         pd->netdev = &ethernet_dev->dev;
 602         pd->nr_chips = of_get_available_child_count(np);
 603         if (pd->nr_chips > DSA_MAX_SWITCHES)
 604                 pd->nr_chips = DSA_MAX_SWITCHES;
 605
 606         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 607                            GFP_KERNEL);
 608         if (!pd->chip) {
 609                 ret = -ENOMEM;
 610                 goto out_free;
 611         }
 612
 613         chip_index = -1;
 614         for_each_available_child_of_node(np, child) {
 615                 chip_index++;
 616                 cd = &pd->chip[chip_index];
 617
 618                 cd->of_node = child;
 619                 cd->host_dev = &mdio_bus->dev;
 620
 621                 sw_addr = of_get_property(child, "reg", NULL);
 622                 if (!sw_addr)
 623                         continue;
 624
 625                 cd->sw_addr = be32_to_cpup(sw_addr);
 626                 if (cd->sw_addr > PHY_MAX_ADDR)
 627                         continue;
 628
 629                 if (!of_property_read_u32(np, "eeprom-length", &eeprom_len))
 630                         cd->eeprom_len = eeprom_len;
 631
 632                 for_each_available_child_of_node(child, port) {
 633                         port_reg = of_get_property(port, "reg", NULL);
 634                         if (!port_reg)
 635                                 continue;
 636
 637                         port_index = be32_to_cpup(port_reg);
 638
 639                         port_name = of_get_property(port, "label", NULL);
 640                         if (!port_name)
 641                                 continue;
 642
 643                         cd->port_dn[port_index] = port;
 644
 645                         cd->port_names[port_index] = kstrdup(port_name,
 646                                         GFP_KERNEL);
 647                         if (!cd->port_names[port_index]) {
 648                                 ret = -ENOMEM;
 649                                 goto out_free_chip;
 650                         }
 651
 652                         link = of_parse_phandle(port, "link", 0);
 653
 654                         if (!strcmp(port_name, "dsa") && link &&
 655                                         pd->nr_chips > 1) {
 656                                 ret = dsa_of_setup_routing_table(pd, cd,
 657                                                 chip_index, link);
 658                                 if (ret)
 659                                         goto out_free_chip;
 660                         }
 661
 662                         if (port_index == DSA_MAX_PORTS)
 663                                 break;
 664                 }
 665         }
 666
 667         return 0;
 668
 669 out_free_chip:
 670         dsa_of_free_platform_data(pd);
 671 out_free:
 672         kfree(pd);
 673         dev->platform_data = NULL;
 674         return ret;
 675 }
 676
 677 static void dsa_of_remove(struct device *dev)
 678 {
 679         struct dsa_platform_data *pd = dev->platform_data;
 680
 681         if (!dev->of_node)
 682                 return;
 683
 684         dsa_of_free_platform_data(pd);
 685         kfree(pd);
 686 }
 687 #else
 688 static inline int dsa_of_probe(struct device *dev)
 689 {
 690         return 0;
 691 }
 692
 693 static inline void dsa_of_remove(struct device *dev)
 694 {
 695 }
 696 #endif
 697
 698 static int dsa_probe(struct platform_device *pdev)
 699 {
 700         struct dsa_platform_data *pd = pdev->dev.platform_data;
 701         struct net_device *dev;
 702         struct dsa_switch_tree *dst;
 703         int i, ret;
 704
 705         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 706                        dsa_driver_version);
 707
 708         if (pdev->dev.of_node) {
 709                 ret = dsa_of_probe(&pdev->dev);
 710                 if (ret)
 711                         return ret;
 712
 713                 pd = pdev->dev.platform_data;
 714         }
 715
 716         if (pd == NULL || pd->netdev == NULL)
 717                 return -EINVAL;
 718
 719         dev = dev_to_net_device(pd->netdev);
 720         if (dev == NULL) {
 721                 ret = -EPROBE_DEFER;
 722                 goto out;
 723         }
 724
 725         if (dev->dsa_ptr != NULL) {
 726                 dev_put(dev);
 727                 ret = -EEXIST;
 728                 goto out;
 729         }
 730
 731         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
 732         if (dst == NULL) {
 733                 dev_put(dev);
 734                 ret = -ENOMEM;
 735                 goto out;
 736         }
 737
 738         platform_set_drvdata(pdev, dst);
 739
 740         dst->pd = pd;
 741         dst->master_netdev = dev;
 742         dst->cpu_switch = -1;
 743         dst->cpu_port = -1;
 744
 745         for (i = 0; i < pd->nr_chips; i++) {
 746                 struct dsa_switch *ds;
 747
 748                 ds = dsa_switch_setup(dst, i, &pdev->dev, pd->chip[i].host_dev);
 749                 if (IS_ERR(ds)) {
 750                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 751                                    i, PTR_ERR(ds));
 752                         continue;
 753                 }
 754
 755                 dst->ds[i] = ds;
 756                 if (ds->drv->poll_link != NULL)
 757                         dst->link_poll_needed = 1;
 758         }
 759
 760         /*
 761          * If we use a tagging format that doesn't have an ethertype
 762          * field, make sure that all packets from this point on get
 763          * sent to the tag format's receive function.
 764          */
 765         wmb();
 766         dev->dsa_ptr = (void *)dst;
 767
 768         if (dst->link_poll_needed) {
 769                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
 770                 init_timer(&dst->link_poll_timer);
 771                 dst->link_poll_timer.data = (unsigned long)dst;
 772                 dst->link_poll_timer.function = dsa_link_poll_timer;
 773                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
 774                 add_timer(&dst->link_poll_timer);
 775         }
 776
 777         return 0;
 778
 779 out:
 780         dsa_of_remove(&pdev->dev);
 781
 782         return ret;
 783 }
 784
 785 static int dsa_remove(struct platform_device *pdev)
 786 {
 787         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 788         int i;
 789
 790         if (dst->link_poll_needed)
 791                 del_timer_sync(&dst->link_poll_timer);
 792
 793         flush_work(&dst->link_poll_work);
 794
 795         for (i = 0; i < dst->pd->nr_chips; i++) {
 796                 struct dsa_switch *ds = dst->ds[i];
 797
 798                 if (ds != NULL)
 799                         dsa_switch_destroy(ds);
 800         }
 801
 802         dsa_of_remove(&pdev->dev);
 803
 804         return 0;
 805 }
 806
 807 static void dsa_shutdown(struct platform_device *pdev)
 808 {
 809 }
 810
 811 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 812                           struct packet_type *pt, struct net_device *orig_dev)
 813 {
 814         struct dsa_switch_tree *dst = dev->dsa_ptr;
 815
 816         if (unlikely(dst == NULL)) {
 817                 kfree_skb(skb);
 818                 return 0;
 819         }
 820
 821         return dst->rcv(skb, dev, pt, orig_dev);
 822 }
 823
 824 static struct packet_type dsa_pack_type __read_mostly = {
 825         .type   = cpu_to_be16(ETH_P_XDSA),
 826         .func   = dsa_switch_rcv,
 827 };
 828
 829 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 830         .notifier_call  = dsa_slave_netdevice_event,
 831 };
 832
 833 #ifdef CONFIG_PM_SLEEP
 834 static int dsa_suspend(struct device *d)
 835 {
 836         struct platform_device *pdev = to_platform_device(d);
 837         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 838         int i, ret = 0;
 839
 840         for (i = 0; i < dst->pd->nr_chips; i++) {
 841                 struct dsa_switch *ds = dst->ds[i];
 842
 843                 if (ds != NULL)
 844                         ret = dsa_switch_suspend(ds);
 845         }
 846
 847         return ret;
 848 }
 849
 850 static int dsa_resume(struct device *d)
 851 {
 852         struct platform_device *pdev = to_platform_device(d);
 853         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 854         int i, ret = 0;
 855
 856         for (i = 0; i < dst->pd->nr_chips; i++) {
 857                 struct dsa_switch *ds = dst->ds[i];
 858
 859                 if (ds != NULL)
 860                         ret = dsa_switch_resume(ds);
 861         }
 862
 863         return ret;
 864 }
 865 #endif
 866
 867 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 868
 869 static const struct of_device_id dsa_of_match_table[] = {
 870         { .compatible = "brcm,bcm7445-switch-v4.0" },
 871         { .compatible = "marvell,dsa", },
 872         {}
 873 };
 874 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
 875
 876 static struct platform_driver dsa_driver = {
 877         .probe          = dsa_probe,
 878         .remove         = dsa_remove,
 879         .shutdown       = dsa_shutdown,
 880         .driver = {
 881                 .name   = "dsa",
 882                 .of_match_table = dsa_of_match_table,
 883                 .pm     = &dsa_pm_ops,
 884         },
 885 };
 886
 887 static int __init dsa_init_module(void)
 888 {
 889         int rc;
 890
 891         register_netdevice_notifier(&dsa_netdevice_nb);
 892
 893         rc = platform_driver_register(&dsa_driver);
 894         if (rc)
 895                 return rc;
 896
 897         dev_add_pack(&dsa_pack_type);
 898
 899         return 0;
 900 }
 901 module_init(dsa_init_module);
 902
 903 static void __exit dsa_cleanup_module(void)
 904 {
 905         unregister_netdevice_notifier(&dsa_netdevice_nb);
 906         dev_remove_pack(&dsa_pack_type);
 907         platform_driver_unregister(&dsa_driver);
 908 }
 909 module_exit(dsa_cleanup_module);
 910
 911 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 912 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
 913 MODULE_LICENSE("GPL");
 914 MODULE_ALIAS("platform:dsa");