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 <linux/phy_fixed.h>
  26 #include "dsa_priv.h"
  27
  28 char dsa_driver_version[] = "0.1";
  29
  30
  31 /* switch driver registration ***********************************************/
  32 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  33 static LIST_HEAD(dsa_switch_drivers);
  34
  35 void register_switch_driver(struct dsa_switch_driver *drv)
  36 {
  37         mutex_lock(&dsa_switch_drivers_mutex);
  38         list_add_tail(&drv->list, &dsa_switch_drivers);
  39         mutex_unlock(&dsa_switch_drivers_mutex);
  40 }
  41 EXPORT_SYMBOL_GPL(register_switch_driver);
  42
  43 void unregister_switch_driver(struct dsa_switch_driver *drv)
  44 {
  45         mutex_lock(&dsa_switch_drivers_mutex);
  46         list_del_init(&drv->list);
  47         mutex_unlock(&dsa_switch_drivers_mutex);
  48 }
  49 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  50
  51 static struct dsa_switch_driver *
  52 dsa_switch_probe(struct device *host_dev, int sw_addr, char **_name)
  53 {
  54         struct dsa_switch_driver *ret;
  55         struct list_head *list;
  56         char *name;
  57
  58         ret = NULL;
  59         name = NULL;
  60
  61         mutex_lock(&dsa_switch_drivers_mutex);
  62         list_for_each(list, &dsa_switch_drivers) {
  63                 struct dsa_switch_driver *drv;
  64
  65                 drv = list_entry(list, struct dsa_switch_driver, list);
  66
  67                 name = drv->probe(host_dev, sw_addr);
  68                 if (name != NULL) {
  69                         ret = drv;
  70                         break;
  71                 }
  72         }
  73         mutex_unlock(&dsa_switch_drivers_mutex);
  74
  75         *_name = name;
  76
  77         return ret;
  78 }
  79
  80 /* hwmon support ************************************************************/
  81
  82 #ifdef CONFIG_NET_DSA_HWMON
  83
  84 static ssize_t temp1_input_show(struct device *dev,
  85                                 struct device_attribute *attr, char *buf)
  86 {
  87         struct dsa_switch *ds = dev_get_drvdata(dev);
  88         int temp, ret;
  89
  90         ret = ds->drv->get_temp(ds, &temp);
  91         if (ret < 0)
  92                 return ret;
  93
  94         return sprintf(buf, "%d\n", temp * 1000);
  95 }
  96 static DEVICE_ATTR_RO(temp1_input);
  97
  98 static ssize_t temp1_max_show(struct device *dev,
  99                               struct device_attribute *attr, char *buf)
 100 {
 101         struct dsa_switch *ds = dev_get_drvdata(dev);
 102         int temp, ret;
 103
 104         ret = ds->drv->get_temp_limit(ds, &temp);
 105         if (ret < 0)
 106                 return ret;
 107
 108         return sprintf(buf, "%d\n", temp * 1000);
 109 }
 110
 111 static ssize_t temp1_max_store(struct device *dev,
 112                                struct device_attribute *attr, const char *buf,
 113                                size_t count)
 114 {
 115         struct dsa_switch *ds = dev_get_drvdata(dev);
 116         int temp, ret;
 117
 118         ret = kstrtoint(buf, 0, &temp);
 119         if (ret < 0)
 120                 return ret;
 121
 122         ret = ds->drv->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 123         if (ret < 0)
 124                 return ret;
 125
 126         return count;
 127 }
 128 static DEVICE_ATTR_RW(temp1_max);
 129
 130 static ssize_t temp1_max_alarm_show(struct device *dev,
 131                                     struct device_attribute *attr, char *buf)
 132 {
 133         struct dsa_switch *ds = dev_get_drvdata(dev);
 134         bool alarm;
 135         int ret;
 136
 137         ret = ds->drv->get_temp_alarm(ds, &alarm);
 138         if (ret < 0)
 139                 return ret;
 140
 141         return sprintf(buf, "%d\n", alarm);
 142 }
 143 static DEVICE_ATTR_RO(temp1_max_alarm);
 144
 145 static struct attribute *dsa_hwmon_attrs[] = {
 146         &dev_attr_temp1_input.attr,     /* 0 */
 147         &dev_attr_temp1_max.attr,       /* 1 */
 148         &dev_attr_temp1_max_alarm.attr, /* 2 */
 149         NULL
 150 };
 151
 152 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 153                                        struct attribute *attr, int index)
 154 {
 155         struct device *dev = container_of(kobj, struct device, kobj);
 156         struct dsa_switch *ds = dev_get_drvdata(dev);
 157         struct dsa_switch_driver *drv = ds->drv;
 158         umode_t mode = attr->mode;
 159
 160         if (index == 1) {
 161                 if (!drv->get_temp_limit)
 162                         mode = 0;
 163                 else if (!drv->set_temp_limit)
 164                         mode &= ~S_IWUSR;
 165         } else if (index == 2 && !drv->get_temp_alarm) {
 166                 mode = 0;
 167         }
 168         return mode;
 169 }
 170
 171 static const struct attribute_group dsa_hwmon_group = {
 172         .attrs = dsa_hwmon_attrs,
 173         .is_visible = dsa_hwmon_attrs_visible,
 174 };
 175 __ATTRIBUTE_GROUPS(dsa_hwmon);
 176
 177 #endif /* CONFIG_NET_DSA_HWMON */
 178
 179 /* basic switch operations **************************************************/
 180 static int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct net_device *master)
 181 {
 182         struct dsa_chip_data *cd = ds->pd;
 183         struct device_node *port_dn;
 184         struct phy_device *phydev;
 185         int ret, port, mode;
 186
 187         for (port = 0; port < DSA_MAX_PORTS; port++) {
 188                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 189                         continue;
 190
 191                 port_dn = cd->port_dn[port];
 192                 if (of_phy_is_fixed_link(port_dn)) {
 193                         ret = of_phy_register_fixed_link(port_dn);
 194                         if (ret) {
 195                                 netdev_err(master,
 196                                            "failed to register fixed PHY\n");
 197                                 return ret;
 198                         }
 199                         phydev = of_phy_find_device(port_dn);
 200
 201                         mode = of_get_phy_mode(port_dn);
 202                         if (mode < 0)
 203                                 mode = PHY_INTERFACE_MODE_NA;
 204                         phydev->interface = mode;
 205
 206                         genphy_config_init(phydev);
 207                         genphy_read_status(phydev);
 208                         if (ds->drv->adjust_link)
 209                                 ds->drv->adjust_link(ds, port, phydev);
 210                 }
 211         }
 212         return 0;
 213 }
 214
 215 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 216 {
 217         struct dsa_switch_driver *drv = ds->drv;
 218         struct dsa_switch_tree *dst = ds->dst;
 219         struct dsa_chip_data *pd = ds->pd;
 220         bool valid_name_found = false;
 221         int index = ds->index;
 222         int i, ret;
 223
 224         /*
 225          * Validate supplied switch configuration.
 226          */
 227         for (i = 0; i < DSA_MAX_PORTS; i++) {
 228                 char *name;
 229
 230                 name = pd->port_names[i];
 231                 if (name == NULL)
 232                         continue;
 233
 234                 if (!strcmp(name, "cpu")) {
 235                         if (dst->cpu_switch != -1) {
 236                                 netdev_err(dst->master_netdev,
 237                                            "multiple cpu ports?!\n");
 238                                 ret = -EINVAL;
 239                                 goto out;
 240                         }
 241                         dst->cpu_switch = index;
 242                         dst->cpu_port = i;
 243                 } else if (!strcmp(name, "dsa")) {
 244                         ds->dsa_port_mask |= 1 << i;
 245                 } else {
 246                         ds->phys_port_mask |= 1 << i;
 247                 }
 248                 valid_name_found = true;
 249         }
 250
 251         if (!valid_name_found && i == DSA_MAX_PORTS) {
 252                 ret = -EINVAL;
 253                 goto out;
 254         }
 255
 256         /* Make the built-in MII bus mask match the number of ports,
 257          * switch drivers can override this later
 258          */
 259         ds->phys_mii_mask = ds->phys_port_mask;
 260
 261         /*
 262          * If the CPU connects to this switch, set the switch tree
 263          * tagging protocol to the preferred tagging format of this
 264          * switch.
 265          */
 266         if (dst->cpu_switch == index) {
 267                 switch (ds->tag_protocol) {
 268 #ifdef CONFIG_NET_DSA_TAG_DSA
 269                 case DSA_TAG_PROTO_DSA:
 270                         dst->rcv = dsa_netdev_ops.rcv;
 271                         break;
 272 #endif
 273 #ifdef CONFIG_NET_DSA_TAG_EDSA
 274                 case DSA_TAG_PROTO_EDSA:
 275                         dst->rcv = edsa_netdev_ops.rcv;
 276                         break;
 277 #endif
 278 #ifdef CONFIG_NET_DSA_TAG_TRAILER
 279                 case DSA_TAG_PROTO_TRAILER:
 280                         dst->rcv = trailer_netdev_ops.rcv;
 281                         break;
 282 #endif
 283 #ifdef CONFIG_NET_DSA_TAG_BRCM
 284                 case DSA_TAG_PROTO_BRCM:
 285                         dst->rcv = brcm_netdev_ops.rcv;
 286                         break;
 287 #endif
 288                 case DSA_TAG_PROTO_NONE:
 289                         break;
 290                 default:
 291                         ret = -ENOPROTOOPT;
 292                         goto out;
 293                 }
 294
 295                 dst->tag_protocol = ds->tag_protocol;
 296         }
 297
 298         /*
 299          * Do basic register setup.
 300          */
 301         ret = drv->setup(ds);
 302         if (ret < 0)
 303                 goto out;
 304
 305         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
 306         if (ret < 0)
 307                 goto out;
 308
 309         ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 310         if (ds->slave_mii_bus == NULL) {
 311                 ret = -ENOMEM;
 312                 goto out;
 313         }
 314         dsa_slave_mii_bus_init(ds);
 315
 316         ret = mdiobus_register(ds->slave_mii_bus);
 317         if (ret < 0)
 318                 goto out;
 319
 320
 321         /*
 322          * Create network devices for physical switch ports.
 323          */
 324         for (i = 0; i < DSA_MAX_PORTS; i++) {
 325                 if (!(ds->phys_port_mask & (1 << i)))
 326                         continue;
 327
 328                 ret = dsa_slave_create(ds, parent, i, pd->port_names[i]);
 329                 if (ret < 0) {
 330                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 331                                    index, i, pd->port_names[i], ret);
 332                         ret = 0;
 333                 }
 334         }
 335
 336         /* Perform configuration of the CPU and DSA ports */
 337         ret = dsa_cpu_dsa_setup(ds, dst->master_netdev);
 338         if (ret < 0) {
 339                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 340                            index);
 341                 ret = 0;
 342         }
 343
 344 #ifdef CONFIG_NET_DSA_HWMON
 345         /* If the switch provides a temperature sensor,
 346          * register with hardware monitoring subsystem.
 347          * Treat registration error as non-fatal and ignore it.
 348          */
 349         if (drv->get_temp) {
 350                 const char *netname = netdev_name(dst->master_netdev);
 351                 char hname[IFNAMSIZ + 1];
 352                 int i, j;
 353
 354                 /* Create valid hwmon 'name' attribute */
 355                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 356                         if (isalnum(netname[i]))
 357                                 hname[j++] = netname[i];
 358                 }
 359                 hname[j] = '\0';
 360                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 361                           hname, index);
 362                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 363                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 364                 if (IS_ERR(ds->hwmon_dev))
 365                         ds->hwmon_dev = NULL;
 366         }
 367 #endif /* CONFIG_NET_DSA_HWMON */
 368
 369         return ret;
 370
 371 out:
 372         return ret;
 373 }
 374
 375 static struct dsa_switch *
 376 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 377                  struct device *parent, struct device *host_dev)
 378 {
 379         struct dsa_chip_data *pd = dst->pd->chip + index;
 380         struct dsa_switch_driver *drv;
 381         struct dsa_switch *ds;
 382         int ret;
 383         char *name;
 384
 385         /*
 386          * Probe for switch model.
 387          */
 388         drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
 389         if (drv == NULL) {
 390                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 391                            index);
 392                 return ERR_PTR(-EINVAL);
 393         }
 394         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 395                     index, name);
 396
 397
 398         /*
 399          * Allocate and initialise switch state.
 400          */
 401         ds = devm_kzalloc(parent, sizeof(*ds) + drv->priv_size, GFP_KERNEL);
 402         if (ds == NULL)
 403                 return ERR_PTR(-ENOMEM);
 404
 405         ds->dst = dst;
 406         ds->index = index;
 407         ds->pd = pd;
 408         ds->drv = drv;
 409         ds->tag_protocol = drv->tag_protocol;
 410         ds->master_dev = host_dev;
 411
 412         ret = dsa_switch_setup_one(ds, parent);
 413         if (ret)
 414                 return ERR_PTR(ret);
 415
 416         return ds;
 417 }
 418
 419 static void dsa_switch_destroy(struct dsa_switch *ds)
 420 {
 421         struct device_node *port_dn;
 422         struct phy_device *phydev;
 423         struct dsa_chip_data *cd = ds->pd;
 424         int port;
 425
 426 #ifdef CONFIG_NET_DSA_HWMON
 427         if (ds->hwmon_dev)
 428                 hwmon_device_unregister(ds->hwmon_dev);
 429 #endif
 430
 431         /* Disable configuration of the CPU and DSA ports */
 432         for (port = 0; port < DSA_MAX_PORTS; port++) {
 433                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 434                         continue;
 435
 436                 port_dn = cd->port_dn[port];
 437                 if (of_phy_is_fixed_link(port_dn)) {
 438                         phydev = of_phy_find_device(port_dn);
 439                         if (phydev) {
 440                                 int addr = phydev->addr;
 441
 442                                 phy_device_free(phydev);
 443                                 of_node_put(port_dn);
 444                                 fixed_phy_del(addr);
 445                         }
 446                 }
 447         }
 448
 449         /* Destroy network devices for physical switch ports. */
 450         for (port = 0; port < DSA_MAX_PORTS; port++) {
 451                 if (!(ds->phys_port_mask & (1 << port)))
 452                         continue;
 453
 454                 if (!ds->ports[port])
 455                         continue;
 456
 457                 unregister_netdev(ds->ports[port]);
 458                 free_netdev(ds->ports[port]);
 459         }
 460
 461         mdiobus_unregister(ds->slave_mii_bus);
 462 }
 463
 464 #ifdef CONFIG_PM_SLEEP
 465 static int dsa_switch_suspend(struct dsa_switch *ds)
 466 {
 467         int i, ret = 0;
 468
 469         /* Suspend slave network devices */
 470         for (i = 0; i < DSA_MAX_PORTS; i++) {
 471                 if (!dsa_is_port_initialized(ds, i))
 472                         continue;
 473
 474                 ret = dsa_slave_suspend(ds->ports[i]);
 475                 if (ret)
 476                         return ret;
 477         }
 478
 479         if (ds->drv->suspend)
 480                 ret = ds->drv->suspend(ds);
 481
 482         return ret;
 483 }
 484
 485 static int dsa_switch_resume(struct dsa_switch *ds)
 486 {
 487         int i, ret = 0;
 488
 489         if (ds->drv->resume)
 490                 ret = ds->drv->resume(ds);
 491
 492         if (ret)
 493                 return ret;
 494
 495         /* Resume slave network devices */
 496         for (i = 0; i < DSA_MAX_PORTS; i++) {
 497                 if (!dsa_is_port_initialized(ds, i))
 498                         continue;
 499
 500                 ret = dsa_slave_resume(ds->ports[i]);
 501                 if (ret)
 502                         return ret;
 503         }
 504
 505         return 0;
 506 }
 507 #endif
 508
 509
 510 /* link polling *************************************************************/
 511 static void dsa_link_poll_work(struct work_struct *ugly)
 512 {
 513         struct dsa_switch_tree *dst;
 514         int i;
 515
 516         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
 517
 518         for (i = 0; i < dst->pd->nr_chips; i++) {
 519                 struct dsa_switch *ds = dst->ds[i];
 520
 521                 if (ds != NULL && ds->drv->poll_link != NULL)
 522                         ds->drv->poll_link(ds);
 523         }
 524
 525         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
 526 }
 527
 528 static void dsa_link_poll_timer(unsigned long _dst)
 529 {
 530         struct dsa_switch_tree *dst = (void *)_dst;
 531
 532         schedule_work(&dst->link_poll_work);
 533 }
 534
 535
 536 /* platform driver init and cleanup *****************************************/
 537 static int dev_is_class(struct device *dev, void *class)
 538 {
 539         if (dev->class != NULL && !strcmp(dev->class->name, class))
 540                 return 1;
 541
 542         return 0;
 543 }
 544
 545 static struct device *dev_find_class(struct device *parent, char *class)
 546 {
 547         if (dev_is_class(parent, class)) {
 548                 get_device(parent);
 549                 return parent;
 550         }
 551
 552         return device_find_child(parent, class, dev_is_class);
 553 }
 554
 555 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 556 {
 557         struct device *d;
 558
 559         d = dev_find_class(dev, "mdio_bus");
 560         if (d != NULL) {
 561                 struct mii_bus *bus;
 562
 563                 bus = to_mii_bus(d);
 564                 put_device(d);
 565
 566                 return bus;
 567         }
 568
 569         return NULL;
 570 }
 571 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 572
 573 static struct net_device *dev_to_net_device(struct device *dev)
 574 {
 575         struct device *d;
 576
 577         d = dev_find_class(dev, "net");
 578         if (d != NULL) {
 579                 struct net_device *nd;
 580
 581                 nd = to_net_dev(d);
 582                 dev_hold(nd);
 583                 put_device(d);
 584
 585                 return nd;
 586         }
 587
 588         return NULL;
 589 }
 590
 591 #ifdef CONFIG_OF
 592 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 593                                         struct dsa_chip_data *cd,
 594                                         int chip_index, int port_index,
 595                                         struct device_node *link)
 596 {
 597         const __be32 *reg;
 598         int link_sw_addr;
 599         struct device_node *parent_sw;
 600         int len;
 601
 602         parent_sw = of_get_parent(link);
 603         if (!parent_sw)
 604                 return -EINVAL;
 605
 606         reg = of_get_property(parent_sw, "reg", &len);
 607         if (!reg || (len != sizeof(*reg) * 2))
 608                 return -EINVAL;
 609
 610         /*
 611          * Get the destination switch number from the second field of its 'reg'
 612          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 613          */
 614         link_sw_addr = be32_to_cpup(reg + 1);
 615
 616         if (link_sw_addr >= pd->nr_chips)
 617                 return -EINVAL;
 618
 619         /* First time routing table allocation */
 620         if (!cd->rtable) {
 621                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
 622                                            GFP_KERNEL);
 623                 if (!cd->rtable)
 624                         return -ENOMEM;
 625
 626                 /* default to no valid uplink/downlink */
 627                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
 628         }
 629
 630         cd->rtable[link_sw_addr] = port_index;
 631
 632         return 0;
 633 }
 634
 635 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 636                               struct dsa_chip_data *cd,
 637                               int chip_index, int port_index,
 638                               struct device_node *port,
 639                               const char *port_name)
 640 {
 641         struct device_node *link;
 642         int link_index;
 643         int ret;
 644
 645         for (link_index = 0;; link_index++) {
 646                 link = of_parse_phandle(port, "link", link_index);
 647                 if (!link)
 648                         break;
 649
 650                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 651                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 652                                                          port_index, link);
 653                         if (ret)
 654                                 return ret;
 655                 }
 656         }
 657         return 0;
 658 }
 659
 660 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 661 {
 662         int i;
 663         int port_index;
 664
 665         for (i = 0; i < pd->nr_chips; i++) {
 666                 port_index = 0;
 667                 while (port_index < DSA_MAX_PORTS) {
 668                         kfree(pd->chip[i].port_names[port_index]);
 669                         port_index++;
 670                 }
 671                 kfree(pd->chip[i].rtable);
 672
 673                 /* Drop our reference to the MDIO bus device */
 674                 if (pd->chip[i].host_dev)
 675                         put_device(pd->chip[i].host_dev);
 676         }
 677         kfree(pd->chip);
 678 }
 679
 680 static int dsa_of_probe(struct device *dev)
 681 {
 682         struct device_node *np = dev->of_node;
 683         struct device_node *child, *mdio, *ethernet, *port;
 684         struct mii_bus *mdio_bus, *mdio_bus_switch;
 685         struct net_device *ethernet_dev;
 686         struct dsa_platform_data *pd;
 687         struct dsa_chip_data *cd;
 688         const char *port_name;
 689         int chip_index, port_index;
 690         const unsigned int *sw_addr, *port_reg;
 691         u32 eeprom_len;
 692         int ret;
 693
 694         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 695         if (!mdio)
 696                 return -EINVAL;
 697
 698         mdio_bus = of_mdio_find_bus(mdio);
 699         if (!mdio_bus)
 700                 return -EPROBE_DEFER;
 701
 702         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 703         if (!ethernet) {
 704                 ret = -EINVAL;
 705                 goto out_put_mdio;
 706         }
 707
 708         ethernet_dev = of_find_net_device_by_node(ethernet);
 709         if (!ethernet_dev) {
 710                 ret = -EPROBE_DEFER;
 711                 goto out_put_mdio;
 712         }
 713
 714         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 715         if (!pd) {
 716                 ret = -ENOMEM;
 717                 goto out_put_ethernet;
 718         }
 719
 720         dev->platform_data = pd;
 721         pd->of_netdev = ethernet_dev;
 722         pd->nr_chips = of_get_available_child_count(np);
 723         if (pd->nr_chips > DSA_MAX_SWITCHES)
 724                 pd->nr_chips = DSA_MAX_SWITCHES;
 725
 726         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 727                            GFP_KERNEL);
 728         if (!pd->chip) {
 729                 ret = -ENOMEM;
 730                 goto out_free;
 731         }
 732
 733         chip_index = -1;
 734         for_each_available_child_of_node(np, child) {
 735                 chip_index++;
 736                 cd = &pd->chip[chip_index];
 737
 738                 cd->of_node = child;
 739
 740                 /* When assigning the host device, increment its refcount */
 741                 cd->host_dev = get_device(&mdio_bus->dev);
 742
 743                 sw_addr = of_get_property(child, "reg", NULL);
 744                 if (!sw_addr)
 745                         continue;
 746
 747                 cd->sw_addr = be32_to_cpup(sw_addr);
 748                 if (cd->sw_addr >= PHY_MAX_ADDR)
 749                         continue;
 750
 751                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 752                         cd->eeprom_len = eeprom_len;
 753
 754                 mdio = of_parse_phandle(child, "mii-bus", 0);
 755                 if (mdio) {
 756                         mdio_bus_switch = of_mdio_find_bus(mdio);
 757                         if (!mdio_bus_switch) {
 758                                 ret = -EPROBE_DEFER;
 759                                 goto out_free_chip;
 760                         }
 761
 762                         /* Drop the mdio_bus device ref, replacing the host
 763                          * device with the mdio_bus_switch device, keeping
 764                          * the refcount from of_mdio_find_bus() above.
 765                          */
 766                         put_device(cd->host_dev);
 767                         cd->host_dev = &mdio_bus_switch->dev;
 768                 }
 769
 770                 for_each_available_child_of_node(child, port) {
 771                         port_reg = of_get_property(port, "reg", NULL);
 772                         if (!port_reg)
 773                                 continue;
 774
 775                         port_index = be32_to_cpup(port_reg);
 776                         if (port_index >= DSA_MAX_PORTS)
 777                                 break;
 778
 779                         port_name = of_get_property(port, "label", NULL);
 780                         if (!port_name)
 781                                 continue;
 782
 783                         cd->port_dn[port_index] = port;
 784
 785                         cd->port_names[port_index] = kstrdup(port_name,
 786                                         GFP_KERNEL);
 787                         if (!cd->port_names[port_index]) {
 788                                 ret = -ENOMEM;
 789                                 goto out_free_chip;
 790                         }
 791
 792                         ret = dsa_of_probe_links(pd, cd, chip_index,
 793                                                  port_index, port, port_name);
 794                         if (ret)
 795                                 goto out_free_chip;
 796
 797                 }
 798         }
 799
 800         /* The individual chips hold their own refcount on the mdio bus,
 801          * so drop ours */
 802         put_device(&mdio_bus->dev);
 803
 804         return 0;
 805
 806 out_free_chip:
 807         dsa_of_free_platform_data(pd);
 808 out_free:
 809         kfree(pd);
 810         dev->platform_data = NULL;
 811 out_put_ethernet:
 812         put_device(&ethernet_dev->dev);
 813 out_put_mdio:
 814         put_device(&mdio_bus->dev);
 815         return ret;
 816 }
 817
 818 static void dsa_of_remove(struct device *dev)
 819 {
 820         struct dsa_platform_data *pd = dev->platform_data;
 821
 822         if (!dev->of_node)
 823                 return;
 824
 825         dsa_of_free_platform_data(pd);
 826         put_device(&pd->of_netdev->dev);
 827         kfree(pd);
 828 }
 829 #else
 830 static inline int dsa_of_probe(struct device *dev)
 831 {
 832         return 0;
 833 }
 834
 835 static inline void dsa_of_remove(struct device *dev)
 836 {
 837 }
 838 #endif
 839
 840 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 841                          struct device *parent, struct dsa_platform_data *pd)
 842 {
 843         int i;
 844         unsigned configured = 0;
 845
 846         dst->pd = pd;
 847         dst->master_netdev = dev;
 848         dst->cpu_switch = -1;
 849         dst->cpu_port = -1;
 850
 851         for (i = 0; i < pd->nr_chips; i++) {
 852                 struct dsa_switch *ds;
 853
 854                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 855                 if (IS_ERR(ds)) {
 856                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 857                                    i, PTR_ERR(ds));
 858                         continue;
 859                 }
 860
 861                 dst->ds[i] = ds;
 862                 if (ds->drv->poll_link != NULL)
 863                         dst->link_poll_needed = 1;
 864
 865                 ++configured;
 866         }
 867
 868         /*
 869          * If no switch was found, exit cleanly
 870          */
 871         if (!configured)
 872                 return -EPROBE_DEFER;
 873
 874         /*
 875          * If we use a tagging format that doesn't have an ethertype
 876          * field, make sure that all packets from this point on get
 877          * sent to the tag format's receive function.
 878          */
 879         wmb();
 880         dev->dsa_ptr = (void *)dst;
 881
 882         if (dst->link_poll_needed) {
 883                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
 884                 init_timer(&dst->link_poll_timer);
 885                 dst->link_poll_timer.data = (unsigned long)dst;
 886                 dst->link_poll_timer.function = dsa_link_poll_timer;
 887                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
 888                 add_timer(&dst->link_poll_timer);
 889         }
 890
 891         return 0;
 892 }
 893
 894 static int dsa_probe(struct platform_device *pdev)
 895 {
 896         struct dsa_platform_data *pd = pdev->dev.platform_data;
 897         struct net_device *dev;
 898         struct dsa_switch_tree *dst;
 899         int ret;
 900
 901         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 902                        dsa_driver_version);
 903
 904         if (pdev->dev.of_node) {
 905                 ret = dsa_of_probe(&pdev->dev);
 906                 if (ret)
 907                         return ret;
 908
 909                 pd = pdev->dev.platform_data;
 910         }
 911
 912         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 913                 return -EINVAL;
 914
 915         if (pd->of_netdev) {
 916                 dev = pd->of_netdev;
 917                 dev_hold(dev);
 918         } else {
 919                 dev = dev_to_net_device(pd->netdev);
 920         }
 921         if (dev == NULL) {
 922                 ret = -EPROBE_DEFER;
 923                 goto out;
 924         }
 925
 926         if (dev->dsa_ptr != NULL) {
 927                 dev_put(dev);
 928                 ret = -EEXIST;
 929                 goto out;
 930         }
 931
 932         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 933         if (dst == NULL) {
 934                 dev_put(dev);
 935                 ret = -ENOMEM;
 936                 goto out;
 937         }
 938
 939         platform_set_drvdata(pdev, dst);
 940
 941         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 942         if (ret)
 943                 goto out;
 944
 945         return 0;
 946
 947 out:
 948         dsa_of_remove(&pdev->dev);
 949
 950         return ret;
 951 }
 952
 953 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 954 {
 955         int i;
 956
 957         if (dst->link_poll_needed)
 958                 del_timer_sync(&dst->link_poll_timer);
 959
 960         flush_work(&dst->link_poll_work);
 961
 962         for (i = 0; i < dst->pd->nr_chips; i++) {
 963                 struct dsa_switch *ds = dst->ds[i];
 964
 965                 if (ds)
 966                         dsa_switch_destroy(ds);
 967         }
 968 }
 969
 970 static int dsa_remove(struct platform_device *pdev)
 971 {
 972         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 973
 974         dsa_remove_dst(dst);
 975         dsa_of_remove(&pdev->dev);
 976
 977         return 0;
 978 }
 979
 980 static void dsa_shutdown(struct platform_device *pdev)
 981 {
 982 }
 983
 984 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 985                           struct packet_type *pt, struct net_device *orig_dev)
 986 {
 987         struct dsa_switch_tree *dst = dev->dsa_ptr;
 988
 989         if (unlikely(dst == NULL)) {
 990                 kfree_skb(skb);
 991                 return 0;
 992         }
 993
 994         return dst->rcv(skb, dev, pt, orig_dev);
 995 }
 996
 997 static struct packet_type dsa_pack_type __read_mostly = {
 998         .type   = cpu_to_be16(ETH_P_XDSA),
 999         .func   = dsa_switch_rcv,
1000 };
1001
1002 static struct notifier_block dsa_netdevice_nb __read_mostly = {
1003         .notifier_call  = dsa_slave_netdevice_event,
1004 };
1005
1006 #ifdef CONFIG_PM_SLEEP
1007 static int dsa_suspend(struct device *d)
1008 {
1009         struct platform_device *pdev = to_platform_device(d);
1010         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1011         int i, ret = 0;
1012
1013         for (i = 0; i < dst->pd->nr_chips; i++) {
1014                 struct dsa_switch *ds = dst->ds[i];
1015
1016                 if (ds != NULL)
1017                         ret = dsa_switch_suspend(ds);
1018         }
1019
1020         return ret;
1021 }
1022
1023 static int dsa_resume(struct device *d)
1024 {
1025         struct platform_device *pdev = to_platform_device(d);
1026         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1027         int i, ret = 0;
1028
1029         for (i = 0; i < dst->pd->nr_chips; i++) {
1030                 struct dsa_switch *ds = dst->ds[i];
1031
1032                 if (ds != NULL)
1033                         ret = dsa_switch_resume(ds);
1034         }
1035
1036         return ret;
1037 }
1038 #endif
1039
1040 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1041
1042 static const struct of_device_id dsa_of_match_table[] = {
1043         { .compatible = "brcm,bcm7445-switch-v4.0" },
1044         { .compatible = "marvell,dsa", },
1045         {}
1046 };
1047 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1048
1049 static struct platform_driver dsa_driver = {
1050         .probe          = dsa_probe,
1051         .remove         = dsa_remove,
1052         .shutdown       = dsa_shutdown,
1053         .driver = {
1054                 .name   = "dsa",
1055                 .of_match_table = dsa_of_match_table,
1056                 .pm     = &dsa_pm_ops,
1057         },
1058 };
1059
1060 static int __init dsa_init_module(void)
1061 {
1062         int rc;
1063
1064         register_netdevice_notifier(&dsa_netdevice_nb);
1065
1066         rc = platform_driver_register(&dsa_driver);
1067         if (rc)
1068                 return rc;
1069
1070         dev_add_pack(&dsa_pack_type);
1071
1072         return 0;
1073 }
1074 module_init(dsa_init_module);
1075
1076 static void __exit dsa_cleanup_module(void)
1077 {
1078         unregister_netdevice_notifier(&dsa_netdevice_nb);
1079         dev_remove_pack(&dsa_pack_type);
1080         platform_driver_unregister(&dsa_driver);
1081 }
1082 module_exit(dsa_cleanup_module);
1083
1084 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1085 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1086 MODULE_LICENSE("GPL");
1087 MODULE_ALIAS("platform:dsa");