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                 struct net_device *slave_dev;
 318
 319                 if (!(ds->phys_port_mask & (1 << i)))
 320                         continue;
 321
 322                 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
 323                 if (slave_dev == NULL) {
 324                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s)\n",
 325                                    index, i, pd->port_names[i]);
 326                         continue;
 327                 }
 328
 329                 ds->ports[i] = slave_dev;
 330         }
 331
 332 #ifdef CONFIG_NET_DSA_HWMON
 333         /* If the switch provides a temperature sensor,
 334          * register with hardware monitoring subsystem.
 335          * Treat registration error as non-fatal and ignore it.
 336          */
 337         if (drv->get_temp) {
 338                 const char *netname = netdev_name(dst->master_netdev);
 339                 char hname[IFNAMSIZ + 1];
 340                 int i, j;
 341
 342                 /* Create valid hwmon 'name' attribute */
 343                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 344                         if (isalnum(netname[i]))
 345                                 hname[j++] = netname[i];
 346                 }
 347                 hname[j] = '\0';
 348                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 349                           hname, index);
 350                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 351                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 352                 if (IS_ERR(ds->hwmon_dev))
 353                         ds->hwmon_dev = NULL;
 354         }
 355 #endif /* CONFIG_NET_DSA_HWMON */
 356
 357         return ds;
 358
 359 out_free:
 360         mdiobus_free(ds->slave_mii_bus);
 361 out:
 362         kfree(ds);
 363         return ERR_PTR(ret);
 364 }
 365
 366 static void dsa_switch_destroy(struct dsa_switch *ds)
 367 {
 368 #ifdef CONFIG_NET_DSA_HWMON
 369         if (ds->hwmon_dev)
 370                 hwmon_device_unregister(ds->hwmon_dev);
 371 #endif
 372 }
 373
 374 #ifdef CONFIG_PM_SLEEP
 375 static int dsa_switch_suspend(struct dsa_switch *ds)
 376 {
 377         int i, ret = 0;
 378
 379         /* Suspend slave network devices */
 380         for (i = 0; i < DSA_MAX_PORTS; i++) {
 381                 if (!(ds->phys_port_mask & (1 << i)))
 382                         continue;
 383
 384                 ret = dsa_slave_suspend(ds->ports[i]);
 385                 if (ret)
 386                         return ret;
 387         }
 388
 389         if (ds->drv->suspend)
 390                 ret = ds->drv->suspend(ds);
 391
 392         return ret;
 393 }
 394
 395 static int dsa_switch_resume(struct dsa_switch *ds)
 396 {
 397         int i, ret = 0;
 398
 399         if (ds->drv->resume)
 400                 ret = ds->drv->resume(ds);
 401
 402         if (ret)
 403                 return ret;
 404
 405         /* Resume slave network devices */
 406         for (i = 0; i < DSA_MAX_PORTS; i++) {
 407                 if (!(ds->phys_port_mask & (1 << i)))
 408                         continue;
 409
 410                 ret = dsa_slave_resume(ds->ports[i]);
 411                 if (ret)
 412                         return ret;
 413         }
 414
 415         return 0;
 416 }
 417 #endif
 418
 419
 420 /* link polling *************************************************************/
 421 static void dsa_link_poll_work(struct work_struct *ugly)
 422 {
 423         struct dsa_switch_tree *dst;
 424         int i;
 425
 426         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
 427
 428         for (i = 0; i < dst->pd->nr_chips; i++) {
 429                 struct dsa_switch *ds = dst->ds[i];
 430
 431                 if (ds != NULL && ds->drv->poll_link != NULL)
 432                         ds->drv->poll_link(ds);
 433         }
 434
 435         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
 436 }
 437
 438 static void dsa_link_poll_timer(unsigned long _dst)
 439 {
 440         struct dsa_switch_tree *dst = (void *)_dst;
 441
 442         schedule_work(&dst->link_poll_work);
 443 }
 444
 445
 446 /* platform driver init and cleanup *****************************************/
 447 static int dev_is_class(struct device *dev, void *class)
 448 {
 449         if (dev->class != NULL && !strcmp(dev->class->name, class))
 450                 return 1;
 451
 452         return 0;
 453 }
 454
 455 static struct device *dev_find_class(struct device *parent, char *class)
 456 {
 457         if (dev_is_class(parent, class)) {
 458                 get_device(parent);
 459                 return parent;
 460         }
 461
 462         return device_find_child(parent, class, dev_is_class);
 463 }
 464
 465 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 466 {
 467         struct device *d;
 468
 469         d = dev_find_class(dev, "mdio_bus");
 470         if (d != NULL) {
 471                 struct mii_bus *bus;
 472
 473                 bus = to_mii_bus(d);
 474                 put_device(d);
 475
 476                 return bus;
 477         }
 478
 479         return NULL;
 480 }
 481 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 482
 483 static struct net_device *dev_to_net_device(struct device *dev)
 484 {
 485         struct device *d;
 486
 487         d = dev_find_class(dev, "net");
 488         if (d != NULL) {
 489                 struct net_device *nd;
 490
 491                 nd = to_net_dev(d);
 492                 dev_hold(nd);
 493                 put_device(d);
 494
 495                 return nd;
 496         }
 497
 498         return NULL;
 499 }
 500
 501 #ifdef CONFIG_OF
 502 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 503                                         struct dsa_chip_data *cd,
 504                                         int chip_index, int port_index,
 505                                         struct device_node *link)
 506 {
 507         const __be32 *reg;
 508         int link_sw_addr;
 509         struct device_node *parent_sw;
 510         int len;
 511
 512         parent_sw = of_get_parent(link);
 513         if (!parent_sw)
 514                 return -EINVAL;
 515
 516         reg = of_get_property(parent_sw, "reg", &len);
 517         if (!reg || (len != sizeof(*reg) * 2))
 518                 return -EINVAL;
 519
 520         /*
 521          * Get the destination switch number from the second field of its 'reg'
 522          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 523          */
 524         link_sw_addr = be32_to_cpup(reg + 1);
 525
 526         if (link_sw_addr >= pd->nr_chips)
 527                 return -EINVAL;
 528
 529         /* First time routing table allocation */
 530         if (!cd->rtable) {
 531                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
 532                                            GFP_KERNEL);
 533                 if (!cd->rtable)
 534                         return -ENOMEM;
 535
 536                 /* default to no valid uplink/downlink */
 537                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
 538         }
 539
 540         cd->rtable[link_sw_addr] = port_index;
 541
 542         return 0;
 543 }
 544
 545 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 546 {
 547         int i;
 548         int port_index;
 549
 550         for (i = 0; i < pd->nr_chips; i++) {
 551                 port_index = 0;
 552                 while (port_index < DSA_MAX_PORTS) {
 553                         kfree(pd->chip[i].port_names[port_index]);
 554                         port_index++;
 555                 }
 556                 kfree(pd->chip[i].rtable);
 557         }
 558         kfree(pd->chip);
 559 }
 560
 561 static int dsa_of_probe(struct platform_device *pdev)
 562 {
 563         struct device_node *np = pdev->dev.of_node;
 564         struct device_node *child, *mdio, *ethernet, *port, *link;
 565         struct mii_bus *mdio_bus;
 566         struct platform_device *ethernet_dev;
 567         struct dsa_platform_data *pd;
 568         struct dsa_chip_data *cd;
 569         const char *port_name;
 570         int chip_index, port_index;
 571         const unsigned int *sw_addr, *port_reg;
 572         u32 eeprom_len;
 573         int ret;
 574
 575         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 576         if (!mdio)
 577                 return -EINVAL;
 578
 579         mdio_bus = of_mdio_find_bus(mdio);
 580         if (!mdio_bus)
 581                 return -EINVAL;
 582
 583         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 584         if (!ethernet)
 585                 return -EINVAL;
 586
 587         ethernet_dev = of_find_device_by_node(ethernet);
 588         if (!ethernet_dev)
 589                 return -ENODEV;
 590
 591         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 592         if (!pd)
 593                 return -ENOMEM;
 594
 595         pdev->dev.platform_data = pd;
 596         pd->netdev = &ethernet_dev->dev;
 597         pd->nr_chips = of_get_available_child_count(np);
 598         if (pd->nr_chips > DSA_MAX_SWITCHES)
 599                 pd->nr_chips = DSA_MAX_SWITCHES;
 600
 601         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 602                            GFP_KERNEL);
 603         if (!pd->chip) {
 604                 ret = -ENOMEM;
 605                 goto out_free;
 606         }
 607
 608         chip_index = -1;
 609         for_each_available_child_of_node(np, child) {
 610                 chip_index++;
 611                 cd = &pd->chip[chip_index];
 612
 613                 cd->of_node = child;
 614                 cd->host_dev = &mdio_bus->dev;
 615
 616                 sw_addr = of_get_property(child, "reg", NULL);
 617                 if (!sw_addr)
 618                         continue;
 619
 620                 cd->sw_addr = be32_to_cpup(sw_addr);
 621                 if (cd->sw_addr > PHY_MAX_ADDR)
 622                         continue;
 623
 624                 if (!of_property_read_u32(np, "eeprom-length", &eeprom_len))
 625                         cd->eeprom_len = eeprom_len;
 626
 627                 for_each_available_child_of_node(child, port) {
 628                         port_reg = of_get_property(port, "reg", NULL);
 629                         if (!port_reg)
 630                                 continue;
 631
 632                         port_index = be32_to_cpup(port_reg);
 633
 634                         port_name = of_get_property(port, "label", NULL);
 635                         if (!port_name)
 636                                 continue;
 637
 638                         cd->port_dn[port_index] = port;
 639
 640                         cd->port_names[port_index] = kstrdup(port_name,
 641                                         GFP_KERNEL);
 642                         if (!cd->port_names[port_index]) {
 643                                 ret = -ENOMEM;
 644                                 goto out_free_chip;
 645                         }
 646
 647                         link = of_parse_phandle(port, "link", 0);
 648
 649                         if (!strcmp(port_name, "dsa") && link &&
 650                                         pd->nr_chips > 1) {
 651                                 ret = dsa_of_setup_routing_table(pd, cd,
 652                                                 chip_index, port_index, link);
 653                                 if (ret)
 654                                         goto out_free_chip;
 655                         }
 656
 657                         if (port_index == DSA_MAX_PORTS)
 658                                 break;
 659                 }
 660         }
 661
 662         return 0;
 663
 664 out_free_chip:
 665         dsa_of_free_platform_data(pd);
 666 out_free:
 667         kfree(pd);
 668         pdev->dev.platform_data = NULL;
 669         return ret;
 670 }
 671
 672 static void dsa_of_remove(struct platform_device *pdev)
 673 {
 674         struct dsa_platform_data *pd = pdev->dev.platform_data;
 675
 676         if (!pdev->dev.of_node)
 677                 return;
 678
 679         dsa_of_free_platform_data(pd);
 680         kfree(pd);
 681 }
 682 #else
 683 static inline int dsa_of_probe(struct platform_device *pdev)
 684 {
 685         return 0;
 686 }
 687
 688 static inline void dsa_of_remove(struct platform_device *pdev)
 689 {
 690 }
 691 #endif
 692
 693 static int dsa_probe(struct platform_device *pdev)
 694 {
 695         struct dsa_platform_data *pd = pdev->dev.platform_data;
 696         struct net_device *dev;
 697         struct dsa_switch_tree *dst;
 698         int i, ret;
 699
 700         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 701                        dsa_driver_version);
 702
 703         if (pdev->dev.of_node) {
 704                 ret = dsa_of_probe(pdev);
 705                 if (ret)
 706                         return ret;
 707
 708                 pd = pdev->dev.platform_data;
 709         }
 710
 711         if (pd == NULL || pd->netdev == NULL)
 712                 return -EINVAL;
 713
 714         dev = dev_to_net_device(pd->netdev);
 715         if (dev == NULL) {
 716                 ret = -EINVAL;
 717                 goto out;
 718         }
 719
 720         if (dev->dsa_ptr != NULL) {
 721                 dev_put(dev);
 722                 ret = -EEXIST;
 723                 goto out;
 724         }
 725
 726         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
 727         if (dst == NULL) {
 728                 dev_put(dev);
 729                 ret = -ENOMEM;
 730                 goto out;
 731         }
 732
 733         platform_set_drvdata(pdev, dst);
 734
 735         dst->pd = pd;
 736         dst->master_netdev = dev;
 737         dst->cpu_switch = -1;
 738         dst->cpu_port = -1;
 739
 740         for (i = 0; i < pd->nr_chips; i++) {
 741                 struct dsa_switch *ds;
 742
 743                 ds = dsa_switch_setup(dst, i, &pdev->dev, pd->chip[i].host_dev);
 744                 if (IS_ERR(ds)) {
 745                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 746                                    i, PTR_ERR(ds));
 747                         continue;
 748                 }
 749
 750                 dst->ds[i] = ds;
 751                 if (ds->drv->poll_link != NULL)
 752                         dst->link_poll_needed = 1;
 753         }
 754
 755         /*
 756          * If we use a tagging format that doesn't have an ethertype
 757          * field, make sure that all packets from this point on get
 758          * sent to the tag format's receive function.
 759          */
 760         wmb();
 761         dev->dsa_ptr = (void *)dst;
 762
 763         if (dst->link_poll_needed) {
 764                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
 765                 init_timer(&dst->link_poll_timer);
 766                 dst->link_poll_timer.data = (unsigned long)dst;
 767                 dst->link_poll_timer.function = dsa_link_poll_timer;
 768                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
 769                 add_timer(&dst->link_poll_timer);
 770         }
 771
 772         return 0;
 773
 774 out:
 775         dsa_of_remove(pdev);
 776
 777         return ret;
 778 }
 779
 780 static int dsa_remove(struct platform_device *pdev)
 781 {
 782         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 783         int i;
 784
 785         if (dst->link_poll_needed)
 786                 del_timer_sync(&dst->link_poll_timer);
 787
 788         flush_work(&dst->link_poll_work);
 789
 790         for (i = 0; i < dst->pd->nr_chips; i++) {
 791                 struct dsa_switch *ds = dst->ds[i];
 792
 793                 if (ds != NULL)
 794                         dsa_switch_destroy(ds);
 795         }
 796
 797         dsa_of_remove(pdev);
 798
 799         return 0;
 800 }
 801
 802 static void dsa_shutdown(struct platform_device *pdev)
 803 {
 804 }
 805
 806 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 807                           struct packet_type *pt, struct net_device *orig_dev)
 808 {
 809         struct dsa_switch_tree *dst = dev->dsa_ptr;
 810
 811         if (unlikely(dst == NULL)) {
 812                 kfree_skb(skb);
 813                 return 0;
 814         }
 815
 816         return dst->rcv(skb, dev, pt, orig_dev);
 817 }
 818
 819 static struct packet_type dsa_pack_type __read_mostly = {
 820         .type   = cpu_to_be16(ETH_P_XDSA),
 821         .func   = dsa_switch_rcv,
 822 };
 823
 824 #ifdef CONFIG_PM_SLEEP
 825 static int dsa_suspend(struct device *d)
 826 {
 827         struct platform_device *pdev = to_platform_device(d);
 828         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 829         int i, ret = 0;
 830
 831         for (i = 0; i < dst->pd->nr_chips; i++) {
 832                 struct dsa_switch *ds = dst->ds[i];
 833
 834                 if (ds != NULL)
 835                         ret = dsa_switch_suspend(ds);
 836         }
 837
 838         return ret;
 839 }
 840
 841 static int dsa_resume(struct device *d)
 842 {
 843         struct platform_device *pdev = to_platform_device(d);
 844         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 845         int i, ret = 0;
 846
 847         for (i = 0; i < dst->pd->nr_chips; i++) {
 848                 struct dsa_switch *ds = dst->ds[i];
 849
 850                 if (ds != NULL)
 851                         ret = dsa_switch_resume(ds);
 852         }
 853
 854         return ret;
 855 }
 856 #endif
 857
 858 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 859
 860 static const struct of_device_id dsa_of_match_table[] = {
 861         { .compatible = "brcm,bcm7445-switch-v4.0" },
 862         { .compatible = "marvell,dsa", },
 863         {}
 864 };
 865 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
 866
 867 static struct platform_driver dsa_driver = {
 868         .probe          = dsa_probe,
 869         .remove         = dsa_remove,
 870         .shutdown       = dsa_shutdown,
 871         .driver = {
 872                 .name   = "dsa",
 873                 .of_match_table = dsa_of_match_table,
 874                 .pm     = &dsa_pm_ops,
 875         },
 876 };
 877
 878 static int __init dsa_init_module(void)
 879 {
 880         int rc;
 881
 882         rc = platform_driver_register(&dsa_driver);
 883         if (rc)
 884                 return rc;
 885
 886         dev_add_pack(&dsa_pack_type);
 887
 888         return 0;
 889 }
 890 module_init(dsa_init_module);
 891
 892 static void __exit dsa_cleanup_module(void)
 893 {
 894         dev_remove_pack(&dsa_pack_type);
 895         platform_driver_unregister(&dsa_driver);
 896 }
 897 module_exit(dsa_cleanup_module);
 898
 899 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 900 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
 901 MODULE_LICENSE("GPL");
 902 MODULE_ALIAS("platform:dsa");