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 = mdiobus_alloc();
 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_free;
 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)\n",
 331                                    index, i, pd->port_names[i]);
 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_free:
 372         mdiobus_free(ds->slave_mii_bus);
 373 out:
 374         kfree(ds);
 375         return ret;
 376 }
 377
 378 static struct dsa_switch *
 379 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 380                  struct device *parent, struct device *host_dev)
 381 {
 382         struct dsa_chip_data *pd = dst->pd->chip + index;
 383         struct dsa_switch_driver *drv;
 384         struct dsa_switch *ds;
 385         int ret;
 386         char *name;
 387
 388         /*
 389          * Probe for switch model.
 390          */
 391         drv = dsa_switch_probe(host_dev, pd->sw_addr, &name);
 392         if (drv == NULL) {
 393                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 394                            index);
 395                 return ERR_PTR(-EINVAL);
 396         }
 397         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 398                     index, name);
 399
 400
 401         /*
 402          * Allocate and initialise switch state.
 403          */
 404         ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
 405         if (ds == NULL)
 406                 return ERR_PTR(-ENOMEM);
 407
 408         ds->dst = dst;
 409         ds->index = index;
 410         ds->pd = pd;
 411         ds->drv = drv;
 412         ds->tag_protocol = drv->tag_protocol;
 413         ds->master_dev = host_dev;
 414
 415         ret = dsa_switch_setup_one(ds, parent);
 416         if (ret)
 417                 return ERR_PTR(ret);
 418
 419         return ds;
 420 }
 421
 422 static void dsa_switch_destroy(struct dsa_switch *ds)
 423 {
 424         struct device_node *port_dn;
 425         struct phy_device *phydev;
 426         struct dsa_chip_data *cd = ds->pd;
 427         int port;
 428
 429 #ifdef CONFIG_NET_DSA_HWMON
 430         if (ds->hwmon_dev)
 431                 hwmon_device_unregister(ds->hwmon_dev);
 432 #endif
 433
 434         /* Disable configuration of the CPU and DSA ports */
 435         for (port = 0; port < DSA_MAX_PORTS; port++) {
 436                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 437                         continue;
 438
 439                 port_dn = cd->port_dn[port];
 440                 if (of_phy_is_fixed_link(port_dn)) {
 441                         phydev = of_phy_find_device(port_dn);
 442                         if (phydev) {
 443                                 int addr = phydev->addr;
 444
 445                                 phy_device_free(phydev);
 446                                 of_node_put(port_dn);
 447                                 fixed_phy_del(addr);
 448                         }
 449                 }
 450         }
 451
 452         /* Destroy network devices for physical switch ports. */
 453         for (port = 0; port < DSA_MAX_PORTS; port++) {
 454                 if (!(ds->phys_port_mask & (1 << port)))
 455                         continue;
 456
 457                 if (!ds->ports[port])
 458                         continue;
 459
 460                 unregister_netdev(ds->ports[port]);
 461                 free_netdev(ds->ports[port]);
 462         }
 463
 464         mdiobus_unregister(ds->slave_mii_bus);
 465         mdiobus_free(ds->slave_mii_bus);
 466 }
 467
 468 #ifdef CONFIG_PM_SLEEP
 469 static int dsa_switch_suspend(struct dsa_switch *ds)
 470 {
 471         int i, ret = 0;
 472
 473         /* Suspend slave network devices */
 474         for (i = 0; i < DSA_MAX_PORTS; i++) {
 475                 if (!dsa_is_port_initialized(ds, i))
 476                         continue;
 477
 478                 ret = dsa_slave_suspend(ds->ports[i]);
 479                 if (ret)
 480                         return ret;
 481         }
 482
 483         if (ds->drv->suspend)
 484                 ret = ds->drv->suspend(ds);
 485
 486         return ret;
 487 }
 488
 489 static int dsa_switch_resume(struct dsa_switch *ds)
 490 {
 491         int i, ret = 0;
 492
 493         if (ds->drv->resume)
 494                 ret = ds->drv->resume(ds);
 495
 496         if (ret)
 497                 return ret;
 498
 499         /* Resume slave network devices */
 500         for (i = 0; i < DSA_MAX_PORTS; i++) {
 501                 if (!dsa_is_port_initialized(ds, i))
 502                         continue;
 503
 504                 ret = dsa_slave_resume(ds->ports[i]);
 505                 if (ret)
 506                         return ret;
 507         }
 508
 509         return 0;
 510 }
 511 #endif
 512
 513
 514 /* link polling *************************************************************/
 515 static void dsa_link_poll_work(struct work_struct *ugly)
 516 {
 517         struct dsa_switch_tree *dst;
 518         int i;
 519
 520         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
 521
 522         for (i = 0; i < dst->pd->nr_chips; i++) {
 523                 struct dsa_switch *ds = dst->ds[i];
 524
 525                 if (ds != NULL && ds->drv->poll_link != NULL)
 526                         ds->drv->poll_link(ds);
 527         }
 528
 529         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
 530 }
 531
 532 static void dsa_link_poll_timer(unsigned long _dst)
 533 {
 534         struct dsa_switch_tree *dst = (void *)_dst;
 535
 536         schedule_work(&dst->link_poll_work);
 537 }
 538
 539
 540 /* platform driver init and cleanup *****************************************/
 541 static int dev_is_class(struct device *dev, void *class)
 542 {
 543         if (dev->class != NULL && !strcmp(dev->class->name, class))
 544                 return 1;
 545
 546         return 0;
 547 }
 548
 549 static struct device *dev_find_class(struct device *parent, char *class)
 550 {
 551         if (dev_is_class(parent, class)) {
 552                 get_device(parent);
 553                 return parent;
 554         }
 555
 556         return device_find_child(parent, class, dev_is_class);
 557 }
 558
 559 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 560 {
 561         struct device *d;
 562
 563         d = dev_find_class(dev, "mdio_bus");
 564         if (d != NULL) {
 565                 struct mii_bus *bus;
 566
 567                 bus = to_mii_bus(d);
 568                 put_device(d);
 569
 570                 return bus;
 571         }
 572
 573         return NULL;
 574 }
 575 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 576
 577 static struct net_device *dev_to_net_device(struct device *dev)
 578 {
 579         struct device *d;
 580
 581         d = dev_find_class(dev, "net");
 582         if (d != NULL) {
 583                 struct net_device *nd;
 584
 585                 nd = to_net_dev(d);
 586                 dev_hold(nd);
 587                 put_device(d);
 588
 589                 return nd;
 590         }
 591
 592         return NULL;
 593 }
 594
 595 #ifdef CONFIG_OF
 596 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 597                                         struct dsa_chip_data *cd,
 598                                         int chip_index, int port_index,
 599                                         struct device_node *link)
 600 {
 601         const __be32 *reg;
 602         int link_sw_addr;
 603         struct device_node *parent_sw;
 604         int len;
 605
 606         parent_sw = of_get_parent(link);
 607         if (!parent_sw)
 608                 return -EINVAL;
 609
 610         reg = of_get_property(parent_sw, "reg", &len);
 611         if (!reg || (len != sizeof(*reg) * 2))
 612                 return -EINVAL;
 613
 614         /*
 615          * Get the destination switch number from the second field of its 'reg'
 616          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 617          */
 618         link_sw_addr = be32_to_cpup(reg + 1);
 619
 620         if (link_sw_addr >= pd->nr_chips)
 621                 return -EINVAL;
 622
 623         /* First time routing table allocation */
 624         if (!cd->rtable) {
 625                 cd->rtable = kmalloc_array(pd->nr_chips, sizeof(s8),
 626                                            GFP_KERNEL);
 627                 if (!cd->rtable)
 628                         return -ENOMEM;
 629
 630                 /* default to no valid uplink/downlink */
 631                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
 632         }
 633
 634         cd->rtable[link_sw_addr] = port_index;
 635
 636         return 0;
 637 }
 638
 639 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 640                               struct dsa_chip_data *cd,
 641                               int chip_index, int port_index,
 642                               struct device_node *port,
 643                               const char *port_name)
 644 {
 645         struct device_node *link;
 646         int link_index;
 647         int ret;
 648
 649         for (link_index = 0;; link_index++) {
 650                 link = of_parse_phandle(port, "link", link_index);
 651                 if (!link)
 652                         break;
 653
 654                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 655                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 656                                                          port_index, link);
 657                         if (ret)
 658                                 return ret;
 659                 }
 660         }
 661         return 0;
 662 }
 663
 664 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 665 {
 666         int i;
 667         int port_index;
 668
 669         for (i = 0; i < pd->nr_chips; i++) {
 670                 port_index = 0;
 671                 while (port_index < DSA_MAX_PORTS) {
 672                         kfree(pd->chip[i].port_names[port_index]);
 673                         port_index++;
 674                 }
 675                 kfree(pd->chip[i].rtable);
 676
 677                 /* Drop our reference to the MDIO bus device */
 678                 if (pd->chip[i].host_dev)
 679                         put_device(pd->chip[i].host_dev);
 680         }
 681         kfree(pd->chip);
 682 }
 683
 684 static int dsa_of_probe(struct device *dev)
 685 {
 686         struct device_node *np = dev->of_node;
 687         struct device_node *child, *mdio, *ethernet, *port;
 688         struct mii_bus *mdio_bus, *mdio_bus_switch;
 689         struct net_device *ethernet_dev;
 690         struct dsa_platform_data *pd;
 691         struct dsa_chip_data *cd;
 692         const char *port_name;
 693         int chip_index, port_index;
 694         const unsigned int *sw_addr, *port_reg;
 695         u32 eeprom_len;
 696         int ret;
 697
 698         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 699         if (!mdio)
 700                 return -EINVAL;
 701
 702         mdio_bus = of_mdio_find_bus(mdio);
 703         if (!mdio_bus)
 704                 return -EPROBE_DEFER;
 705
 706         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 707         if (!ethernet) {
 708                 ret = -EINVAL;
 709                 goto out_put_mdio;
 710         }
 711
 712         ethernet_dev = of_find_net_device_by_node(ethernet);
 713         if (!ethernet_dev) {
 714                 ret = -EPROBE_DEFER;
 715                 goto out_put_mdio;
 716         }
 717
 718         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 719         if (!pd) {
 720                 ret = -ENOMEM;
 721                 goto out_put_ethernet;
 722         }
 723
 724         dev->platform_data = pd;
 725         pd->of_netdev = ethernet_dev;
 726         pd->nr_chips = of_get_available_child_count(np);
 727         if (pd->nr_chips > DSA_MAX_SWITCHES)
 728                 pd->nr_chips = DSA_MAX_SWITCHES;
 729
 730         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 731                            GFP_KERNEL);
 732         if (!pd->chip) {
 733                 ret = -ENOMEM;
 734                 goto out_free;
 735         }
 736
 737         chip_index = -1;
 738         for_each_available_child_of_node(np, child) {
 739                 chip_index++;
 740                 cd = &pd->chip[chip_index];
 741
 742                 cd->of_node = child;
 743
 744                 /* When assigning the host device, increment its refcount */
 745                 cd->host_dev = get_device(&mdio_bus->dev);
 746
 747                 sw_addr = of_get_property(child, "reg", NULL);
 748                 if (!sw_addr)
 749                         continue;
 750
 751                 cd->sw_addr = be32_to_cpup(sw_addr);
 752                 if (cd->sw_addr >= PHY_MAX_ADDR)
 753                         continue;
 754
 755                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 756                         cd->eeprom_len = eeprom_len;
 757
 758                 mdio = of_parse_phandle(child, "mii-bus", 0);
 759                 if (mdio) {
 760                         mdio_bus_switch = of_mdio_find_bus(mdio);
 761                         if (!mdio_bus_switch) {
 762                                 ret = -EPROBE_DEFER;
 763                                 goto out_free_chip;
 764                         }
 765
 766                         /* Drop the mdio_bus device ref, replacing the host
 767                          * device with the mdio_bus_switch device, keeping
 768                          * the refcount from of_mdio_find_bus() above.
 769                          */
 770                         put_device(cd->host_dev);
 771                         cd->host_dev = &mdio_bus_switch->dev;
 772                 }
 773
 774                 for_each_available_child_of_node(child, port) {
 775                         port_reg = of_get_property(port, "reg", NULL);
 776                         if (!port_reg)
 777                                 continue;
 778
 779                         port_index = be32_to_cpup(port_reg);
 780                         if (port_index >= DSA_MAX_PORTS)
 781                                 break;
 782
 783                         port_name = of_get_property(port, "label", NULL);
 784                         if (!port_name)
 785                                 continue;
 786
 787                         cd->port_dn[port_index] = port;
 788
 789                         cd->port_names[port_index] = kstrdup(port_name,
 790                                         GFP_KERNEL);
 791                         if (!cd->port_names[port_index]) {
 792                                 ret = -ENOMEM;
 793                                 goto out_free_chip;
 794                         }
 795
 796                         ret = dsa_of_probe_links(pd, cd, chip_index,
 797                                                  port_index, port, port_name);
 798                         if (ret)
 799                                 goto out_free_chip;
 800
 801                 }
 802         }
 803
 804         /* The individual chips hold their own refcount on the mdio bus,
 805          * so drop ours */
 806         put_device(&mdio_bus->dev);
 807
 808         return 0;
 809
 810 out_free_chip:
 811         dsa_of_free_platform_data(pd);
 812 out_free:
 813         kfree(pd);
 814         dev->platform_data = NULL;
 815 out_put_ethernet:
 816         put_device(&ethernet_dev->dev);
 817 out_put_mdio:
 818         put_device(&mdio_bus->dev);
 819         return ret;
 820 }
 821
 822 static void dsa_of_remove(struct device *dev)
 823 {
 824         struct dsa_platform_data *pd = dev->platform_data;
 825
 826         if (!dev->of_node)
 827                 return;
 828
 829         dsa_of_free_platform_data(pd);
 830         put_device(&pd->of_netdev->dev);
 831         kfree(pd);
 832 }
 833 #else
 834 static inline int dsa_of_probe(struct device *dev)
 835 {
 836         return 0;
 837 }
 838
 839 static inline void dsa_of_remove(struct device *dev)
 840 {
 841 }
 842 #endif
 843
 844 static void dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 845                           struct device *parent, struct dsa_platform_data *pd)
 846 {
 847         int i;
 848
 849         dst->pd = pd;
 850         dst->master_netdev = dev;
 851         dst->cpu_switch = -1;
 852         dst->cpu_port = -1;
 853
 854         for (i = 0; i < pd->nr_chips; i++) {
 855                 struct dsa_switch *ds;
 856
 857                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 858                 if (IS_ERR(ds)) {
 859                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 860                                    i, PTR_ERR(ds));
 861                         continue;
 862                 }
 863
 864                 dst->ds[i] = ds;
 865                 if (ds->drv->poll_link != NULL)
 866                         dst->link_poll_needed = 1;
 867         }
 868
 869         /*
 870          * If we use a tagging format that doesn't have an ethertype
 871          * field, make sure that all packets from this point on get
 872          * sent to the tag format's receive function.
 873          */
 874         wmb();
 875         dev->dsa_ptr = (void *)dst;
 876
 877         if (dst->link_poll_needed) {
 878                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
 879                 init_timer(&dst->link_poll_timer);
 880                 dst->link_poll_timer.data = (unsigned long)dst;
 881                 dst->link_poll_timer.function = dsa_link_poll_timer;
 882                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
 883                 add_timer(&dst->link_poll_timer);
 884         }
 885 }
 886
 887 static int dsa_probe(struct platform_device *pdev)
 888 {
 889         struct dsa_platform_data *pd = pdev->dev.platform_data;
 890         struct net_device *dev;
 891         struct dsa_switch_tree *dst;
 892         int ret;
 893
 894         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 895                        dsa_driver_version);
 896
 897         if (pdev->dev.of_node) {
 898                 ret = dsa_of_probe(&pdev->dev);
 899                 if (ret)
 900                         return ret;
 901
 902                 pd = pdev->dev.platform_data;
 903         }
 904
 905         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 906                 return -EINVAL;
 907
 908         if (pd->of_netdev) {
 909                 dev = pd->of_netdev;
 910                 dev_hold(dev);
 911         } else {
 912                 dev = dev_to_net_device(pd->netdev);
 913         }
 914         if (dev == NULL) {
 915                 ret = -EPROBE_DEFER;
 916                 goto out;
 917         }
 918
 919         if (dev->dsa_ptr != NULL) {
 920                 dev_put(dev);
 921                 ret = -EEXIST;
 922                 goto out;
 923         }
 924
 925         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
 926         if (dst == NULL) {
 927                 dev_put(dev);
 928                 ret = -ENOMEM;
 929                 goto out;
 930         }
 931
 932         platform_set_drvdata(pdev, dst);
 933
 934         dsa_setup_dst(dst, dev, &pdev->dev, pd);
 935
 936         return 0;
 937
 938 out:
 939         dsa_of_remove(&pdev->dev);
 940
 941         return ret;
 942 }
 943
 944 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 945 {
 946         int i;
 947
 948         if (dst->link_poll_needed)
 949                 del_timer_sync(&dst->link_poll_timer);
 950
 951         flush_work(&dst->link_poll_work);
 952
 953         for (i = 0; i < dst->pd->nr_chips; i++) {
 954                 struct dsa_switch *ds = dst->ds[i];
 955
 956                 if (ds) {
 957                         dsa_switch_destroy(ds);
 958                         kfree(ds);
 959                 }
 960         }
 961 }
 962
 963 static int dsa_remove(struct platform_device *pdev)
 964 {
 965         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 966
 967         dsa_remove_dst(dst);
 968         kfree(dst);
 969         dsa_of_remove(&pdev->dev);
 970
 971         return 0;
 972 }
 973
 974 static void dsa_shutdown(struct platform_device *pdev)
 975 {
 976 }
 977
 978 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
 979                           struct packet_type *pt, struct net_device *orig_dev)
 980 {
 981         struct dsa_switch_tree *dst = dev->dsa_ptr;
 982
 983         if (unlikely(dst == NULL)) {
 984                 kfree_skb(skb);
 985                 return 0;
 986         }
 987
 988         return dst->rcv(skb, dev, pt, orig_dev);
 989 }
 990
 991 static struct packet_type dsa_pack_type __read_mostly = {
 992         .type   = cpu_to_be16(ETH_P_XDSA),
 993         .func   = dsa_switch_rcv,
 994 };
 995
 996 static struct notifier_block dsa_netdevice_nb __read_mostly = {
 997         .notifier_call  = dsa_slave_netdevice_event,
 998 };
 999
1000 #ifdef CONFIG_PM_SLEEP
1001 static int dsa_suspend(struct device *d)
1002 {
1003         struct platform_device *pdev = to_platform_device(d);
1004         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1005         int i, ret = 0;
1006
1007         for (i = 0; i < dst->pd->nr_chips; i++) {
1008                 struct dsa_switch *ds = dst->ds[i];
1009
1010                 if (ds != NULL)
1011                         ret = dsa_switch_suspend(ds);
1012         }
1013
1014         return ret;
1015 }
1016
1017 static int dsa_resume(struct device *d)
1018 {
1019         struct platform_device *pdev = to_platform_device(d);
1020         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1021         int i, ret = 0;
1022
1023         for (i = 0; i < dst->pd->nr_chips; i++) {
1024                 struct dsa_switch *ds = dst->ds[i];
1025
1026                 if (ds != NULL)
1027                         ret = dsa_switch_resume(ds);
1028         }
1029
1030         return ret;
1031 }
1032 #endif
1033
1034 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1035
1036 static const struct of_device_id dsa_of_match_table[] = {
1037         { .compatible = "brcm,bcm7445-switch-v4.0" },
1038         { .compatible = "marvell,dsa", },
1039         {}
1040 };
1041 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1042
1043 static struct platform_driver dsa_driver = {
1044         .probe          = dsa_probe,
1045         .remove         = dsa_remove,
1046         .shutdown       = dsa_shutdown,
1047         .driver = {
1048                 .name   = "dsa",
1049                 .of_match_table = dsa_of_match_table,
1050                 .pm     = &dsa_pm_ops,
1051         },
1052 };
1053
1054 static int __init dsa_init_module(void)
1055 {
1056         int rc;
1057
1058         register_netdevice_notifier(&dsa_netdevice_nb);
1059
1060         rc = platform_driver_register(&dsa_driver);
1061         if (rc)
1062                 return rc;
1063
1064         dev_add_pack(&dsa_pack_type);
1065
1066         return 0;
1067 }
1068 module_init(dsa_init_module);
1069
1070 static void __exit dsa_cleanup_module(void)
1071 {
1072         unregister_netdevice_notifier(&dsa_netdevice_nb);
1073         dev_remove_pack(&dsa_pack_type);
1074         platform_driver_unregister(&dsa_driver);
1075 }
1076 module_exit(dsa_cleanup_module);
1077
1078 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1079 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1080 MODULE_LICENSE("GPL");
1081 MODULE_ALIAS("platform:dsa");