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/of_gpio.h>
  25 #include <linux/sysfs.h>
  26 #include <linux/phy_fixed.h>
  27 #include <linux/gpio/consumer.h>
  28 #include "dsa_priv.h"
  29
  30 char dsa_driver_version[] = "0.1";
  31
  32 static struct sk_buff *dsa_slave_notag_xmit(struct sk_buff *skb,
  33                                             struct net_device *dev)
  34 {
  35         /* Just return the original SKB */
  36         return skb;
  37 }
  38
  39 static const struct dsa_device_ops none_ops = {
  40         .xmit   = dsa_slave_notag_xmit,
  41         .rcv    = NULL,
  42 };
  43
  44 const struct dsa_device_ops *dsa_device_ops[DSA_TAG_LAST] = {
  45 #ifdef CONFIG_NET_DSA_TAG_DSA
  46         [DSA_TAG_PROTO_DSA] = &dsa_netdev_ops,
  47 #endif
  48 #ifdef CONFIG_NET_DSA_TAG_EDSA
  49         [DSA_TAG_PROTO_EDSA] = &edsa_netdev_ops,
  50 #endif
  51 #ifdef CONFIG_NET_DSA_TAG_TRAILER
  52         [DSA_TAG_PROTO_TRAILER] = &trailer_netdev_ops,
  53 #endif
  54 #ifdef CONFIG_NET_DSA_TAG_BRCM
  55         [DSA_TAG_PROTO_BRCM] = &brcm_netdev_ops,
  56 #endif
  57 #ifdef CONFIG_NET_DSA_TAG_QCA
  58         [DSA_TAG_PROTO_QCA] = &qca_netdev_ops,
  59 #endif
  60         [DSA_TAG_PROTO_NONE] = &none_ops,
  61 };
  62
  63 /* switch driver registration ***********************************************/
  64 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  65 static LIST_HEAD(dsa_switch_drivers);
  66
  67 void register_switch_driver(struct dsa_switch_ops *ops)
  68 {
  69         mutex_lock(&dsa_switch_drivers_mutex);
  70         list_add_tail(&ops->list, &dsa_switch_drivers);
  71         mutex_unlock(&dsa_switch_drivers_mutex);
  72 }
  73 EXPORT_SYMBOL_GPL(register_switch_driver);
  74
  75 void unregister_switch_driver(struct dsa_switch_ops *ops)
  76 {
  77         mutex_lock(&dsa_switch_drivers_mutex);
  78         list_del_init(&ops->list);
  79         mutex_unlock(&dsa_switch_drivers_mutex);
  80 }
  81 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  82
  83 static struct dsa_switch_ops *
  84 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
  85                  const char **_name, void **priv)
  86 {
  87         struct dsa_switch_ops *ret;
  88         struct list_head *list;
  89         const char *name;
  90
  91         ret = NULL;
  92         name = NULL;
  93
  94         mutex_lock(&dsa_switch_drivers_mutex);
  95         list_for_each(list, &dsa_switch_drivers) {
  96                 struct dsa_switch_ops *ops;
  97
  98                 ops = list_entry(list, struct dsa_switch_ops, list);
  99
 100                 name = ops->probe(parent, host_dev, sw_addr, priv);
 101                 if (name != NULL) {
 102                         ret = ops;
 103                         break;
 104                 }
 105         }
 106         mutex_unlock(&dsa_switch_drivers_mutex);
 107
 108         *_name = name;
 109
 110         return ret;
 111 }
 112
 113 /* hwmon support ************************************************************/
 114
 115 #ifdef CONFIG_NET_DSA_HWMON
 116
 117 static ssize_t temp1_input_show(struct device *dev,
 118                                 struct device_attribute *attr, char *buf)
 119 {
 120         struct dsa_switch *ds = dev_get_drvdata(dev);
 121         int temp, ret;
 122
 123         ret = ds->ops->get_temp(ds, &temp);
 124         if (ret < 0)
 125                 return ret;
 126
 127         return sprintf(buf, "%d\n", temp * 1000);
 128 }
 129 static DEVICE_ATTR_RO(temp1_input);
 130
 131 static ssize_t temp1_max_show(struct device *dev,
 132                               struct device_attribute *attr, char *buf)
 133 {
 134         struct dsa_switch *ds = dev_get_drvdata(dev);
 135         int temp, ret;
 136
 137         ret = ds->ops->get_temp_limit(ds, &temp);
 138         if (ret < 0)
 139                 return ret;
 140
 141         return sprintf(buf, "%d\n", temp * 1000);
 142 }
 143
 144 static ssize_t temp1_max_store(struct device *dev,
 145                                struct device_attribute *attr, const char *buf,
 146                                size_t count)
 147 {
 148         struct dsa_switch *ds = dev_get_drvdata(dev);
 149         int temp, ret;
 150
 151         ret = kstrtoint(buf, 0, &temp);
 152         if (ret < 0)
 153                 return ret;
 154
 155         ret = ds->ops->set_temp_limit(ds, DIV_ROUND_CLOSEST(temp, 1000));
 156         if (ret < 0)
 157                 return ret;
 158
 159         return count;
 160 }
 161 static DEVICE_ATTR_RW(temp1_max);
 162
 163 static ssize_t temp1_max_alarm_show(struct device *dev,
 164                                     struct device_attribute *attr, char *buf)
 165 {
 166         struct dsa_switch *ds = dev_get_drvdata(dev);
 167         bool alarm;
 168         int ret;
 169
 170         ret = ds->ops->get_temp_alarm(ds, &alarm);
 171         if (ret < 0)
 172                 return ret;
 173
 174         return sprintf(buf, "%d\n", alarm);
 175 }
 176 static DEVICE_ATTR_RO(temp1_max_alarm);
 177
 178 static struct attribute *dsa_hwmon_attrs[] = {
 179         &dev_attr_temp1_input.attr,     /* 0 */
 180         &dev_attr_temp1_max.attr,       /* 1 */
 181         &dev_attr_temp1_max_alarm.attr, /* 2 */
 182         NULL
 183 };
 184
 185 static umode_t dsa_hwmon_attrs_visible(struct kobject *kobj,
 186                                        struct attribute *attr, int index)
 187 {
 188         struct device *dev = container_of(kobj, struct device, kobj);
 189         struct dsa_switch *ds = dev_get_drvdata(dev);
 190         struct dsa_switch_ops *ops = ds->ops;
 191         umode_t mode = attr->mode;
 192
 193         if (index == 1) {
 194                 if (!ops->get_temp_limit)
 195                         mode = 0;
 196                 else if (!ops->set_temp_limit)
 197                         mode &= ~S_IWUSR;
 198         } else if (index == 2 && !ops->get_temp_alarm) {
 199                 mode = 0;
 200         }
 201         return mode;
 202 }
 203
 204 static const struct attribute_group dsa_hwmon_group = {
 205         .attrs = dsa_hwmon_attrs,
 206         .is_visible = dsa_hwmon_attrs_visible,
 207 };
 208 __ATTRIBUTE_GROUPS(dsa_hwmon);
 209
 210 #endif /* CONFIG_NET_DSA_HWMON */
 211
 212 /* basic switch operations **************************************************/
 213 int dsa_cpu_dsa_setup(struct dsa_switch *ds, struct device *dev,
 214                       struct device_node *port_dn, int port)
 215 {
 216         struct phy_device *phydev;
 217         int ret, mode;
 218
 219         if (of_phy_is_fixed_link(port_dn)) {
 220                 ret = of_phy_register_fixed_link(port_dn);
 221                 if (ret) {
 222                         dev_err(dev, "failed to register fixed PHY\n");
 223                         return ret;
 224                 }
 225                 phydev = of_phy_find_device(port_dn);
 226
 227                 mode = of_get_phy_mode(port_dn);
 228                 if (mode < 0)
 229                         mode = PHY_INTERFACE_MODE_NA;
 230                 phydev->interface = mode;
 231
 232                 genphy_config_init(phydev);
 233                 genphy_read_status(phydev);
 234                 if (ds->ops->adjust_link)
 235                         ds->ops->adjust_link(ds, port, phydev);
 236         }
 237
 238         return 0;
 239 }
 240
 241 static int dsa_cpu_dsa_setups(struct dsa_switch *ds, struct device *dev)
 242 {
 243         struct device_node *port_dn;
 244         int ret, port;
 245
 246         for (port = 0; port < DSA_MAX_PORTS; port++) {
 247                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 248                         continue;
 249
 250                 port_dn = ds->ports[port].dn;
 251                 ret = dsa_cpu_dsa_setup(ds, dev, port_dn, port);
 252                 if (ret)
 253                         return ret;
 254         }
 255         return 0;
 256 }
 257
 258 const struct dsa_device_ops *dsa_resolve_tag_protocol(int tag_protocol)
 259 {
 260         const struct dsa_device_ops *ops;
 261
 262         if (tag_protocol >= DSA_TAG_LAST)
 263                 return ERR_PTR(-EINVAL);
 264         ops = dsa_device_ops[tag_protocol];
 265
 266         if (!ops)
 267                 return ERR_PTR(-ENOPROTOOPT);
 268
 269         return ops;
 270 }
 271
 272 int dsa_cpu_port_ethtool_setup(struct dsa_switch *ds)
 273 {
 274         struct net_device *master;
 275         struct ethtool_ops *cpu_ops;
 276
 277         master = ds->dst->master_netdev;
 278         if (ds->master_netdev)
 279                 master = ds->master_netdev;
 280
 281         cpu_ops = devm_kzalloc(ds->dev, sizeof(*cpu_ops), GFP_KERNEL);
 282         if (!cpu_ops)
 283                 return -ENOMEM;
 284
 285         memcpy(&ds->dst->master_ethtool_ops, master->ethtool_ops,
 286                sizeof(struct ethtool_ops));
 287         ds->dst->master_orig_ethtool_ops = master->ethtool_ops;
 288         memcpy(cpu_ops, &ds->dst->master_ethtool_ops,
 289                sizeof(struct ethtool_ops));
 290         dsa_cpu_port_ethtool_init(cpu_ops);
 291         master->ethtool_ops = cpu_ops;
 292
 293         return 0;
 294 }
 295
 296 void dsa_cpu_port_ethtool_restore(struct dsa_switch *ds)
 297 {
 298         struct net_device *master;
 299
 300         master = ds->dst->master_netdev;
 301         if (ds->master_netdev)
 302                 master = ds->master_netdev;
 303
 304         master->ethtool_ops = ds->dst->master_orig_ethtool_ops;
 305 }
 306
 307 static int dsa_switch_setup_one(struct dsa_switch *ds, struct device *parent)
 308 {
 309         struct dsa_switch_ops *ops = ds->ops;
 310         struct dsa_switch_tree *dst = ds->dst;
 311         struct dsa_chip_data *cd = ds->cd;
 312         bool valid_name_found = false;
 313         int index = ds->index;
 314         int i, ret;
 315
 316         /*
 317          * Validate supplied switch configuration.
 318          */
 319         for (i = 0; i < DSA_MAX_PORTS; i++) {
 320                 char *name;
 321
 322                 name = cd->port_names[i];
 323                 if (name == NULL)
 324                         continue;
 325
 326                 if (!strcmp(name, "cpu")) {
 327                         if (dst->cpu_switch != -1) {
 328                                 netdev_err(dst->master_netdev,
 329                                            "multiple cpu ports?!\n");
 330                                 ret = -EINVAL;
 331                                 goto out;
 332                         }
 333                         dst->cpu_switch = index;
 334                         dst->cpu_port = i;
 335                         ds->cpu_port_mask |= 1 << i;
 336                 } else if (!strcmp(name, "dsa")) {
 337                         ds->dsa_port_mask |= 1 << i;
 338                 } else {
 339                         ds->enabled_port_mask |= 1 << i;
 340                 }
 341                 valid_name_found = true;
 342         }
 343
 344         if (!valid_name_found && i == DSA_MAX_PORTS) {
 345                 ret = -EINVAL;
 346                 goto out;
 347         }
 348
 349         /* Make the built-in MII bus mask match the number of ports,
 350          * switch drivers can override this later
 351          */
 352         ds->phys_mii_mask = ds->enabled_port_mask;
 353
 354         /*
 355          * If the CPU connects to this switch, set the switch tree
 356          * tagging protocol to the preferred tagging format of this
 357          * switch.
 358          */
 359         if (dst->cpu_switch == index) {
 360                 enum dsa_tag_protocol tag_protocol;
 361
 362                 tag_protocol = ops->get_tag_protocol(ds);
 363                 dst->tag_ops = dsa_resolve_tag_protocol(tag_protocol);
 364                 if (IS_ERR(dst->tag_ops)) {
 365                         ret = PTR_ERR(dst->tag_ops);
 366                         goto out;
 367                 }
 368
 369                 dst->rcv = dst->tag_ops->rcv;
 370         }
 371
 372         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 373
 374         /*
 375          * Do basic register setup.
 376          */
 377         ret = ops->setup(ds);
 378         if (ret < 0)
 379                 goto out;
 380
 381         if (ops->set_addr) {
 382                 ret = ops->set_addr(ds, dst->master_netdev->dev_addr);
 383                 if (ret < 0)
 384                         goto out;
 385         }
 386
 387         if (!ds->slave_mii_bus && ops->phy_read) {
 388                 ds->slave_mii_bus = devm_mdiobus_alloc(parent);
 389                 if (!ds->slave_mii_bus) {
 390                         ret = -ENOMEM;
 391                         goto out;
 392                 }
 393                 dsa_slave_mii_bus_init(ds);
 394
 395                 ret = mdiobus_register(ds->slave_mii_bus);
 396                 if (ret < 0)
 397                         goto out;
 398         }
 399
 400         /*
 401          * Create network devices for physical switch ports.
 402          */
 403         for (i = 0; i < DSA_MAX_PORTS; i++) {
 404                 ds->ports[i].dn = cd->port_dn[i];
 405
 406                 if (!(ds->enabled_port_mask & (1 << i)))
 407                         continue;
 408
 409                 ret = dsa_slave_create(ds, parent, i, cd->port_names[i]);
 410                 if (ret < 0) {
 411                         netdev_err(dst->master_netdev, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 412                                    index, i, cd->port_names[i], ret);
 413                         ret = 0;
 414                 }
 415         }
 416
 417         /* Perform configuration of the CPU and DSA ports */
 418         ret = dsa_cpu_dsa_setups(ds, parent);
 419         if (ret < 0) {
 420                 netdev_err(dst->master_netdev, "[%d] : can't configure CPU and DSA ports\n",
 421                            index);
 422                 ret = 0;
 423         }
 424
 425         ret = dsa_cpu_port_ethtool_setup(ds);
 426         if (ret)
 427                 return ret;
 428
 429 #ifdef CONFIG_NET_DSA_HWMON
 430         /* If the switch provides a temperature sensor,
 431          * register with hardware monitoring subsystem.
 432          * Treat registration error as non-fatal and ignore it.
 433          */
 434         if (ops->get_temp) {
 435                 const char *netname = netdev_name(dst->master_netdev);
 436                 char hname[IFNAMSIZ + 1];
 437                 int i, j;
 438
 439                 /* Create valid hwmon 'name' attribute */
 440                 for (i = j = 0; i < IFNAMSIZ && netname[i]; i++) {
 441                         if (isalnum(netname[i]))
 442                                 hname[j++] = netname[i];
 443                 }
 444                 hname[j] = '\0';
 445                 scnprintf(ds->hwmon_name, sizeof(ds->hwmon_name), "%s_dsa%d",
 446                           hname, index);
 447                 ds->hwmon_dev = hwmon_device_register_with_groups(NULL,
 448                                         ds->hwmon_name, ds, dsa_hwmon_groups);
 449                 if (IS_ERR(ds->hwmon_dev))
 450                         ds->hwmon_dev = NULL;
 451         }
 452 #endif /* CONFIG_NET_DSA_HWMON */
 453
 454         return ret;
 455
 456 out:
 457         return ret;
 458 }
 459
 460 static struct dsa_switch *
 461 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 462                  struct device *parent, struct device *host_dev)
 463 {
 464         struct dsa_chip_data *cd = dst->pd->chip + index;
 465         struct dsa_switch_ops *ops;
 466         struct dsa_switch *ds;
 467         int ret;
 468         const char *name;
 469         void *priv;
 470
 471         /*
 472          * Probe for switch model.
 473          */
 474         ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 475         if (!ops) {
 476                 netdev_err(dst->master_netdev, "[%d]: could not detect attached switch\n",
 477                            index);
 478                 return ERR_PTR(-EINVAL);
 479         }
 480         netdev_info(dst->master_netdev, "[%d]: detected a %s switch\n",
 481                     index, name);
 482
 483
 484         /*
 485          * Allocate and initialise switch state.
 486          */
 487         ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 488         if (ds == NULL)
 489                 return ERR_PTR(-ENOMEM);
 490
 491         ds->dst = dst;
 492         ds->index = index;
 493         ds->cd = cd;
 494         ds->ops = ops;
 495         ds->priv = priv;
 496         ds->dev = parent;
 497
 498         ret = dsa_switch_setup_one(ds, parent);
 499         if (ret)
 500                 return ERR_PTR(ret);
 501
 502         return ds;
 503 }
 504
 505 void dsa_cpu_dsa_destroy(struct device_node *port_dn)
 506 {
 507         struct phy_device *phydev;
 508
 509         if (of_phy_is_fixed_link(port_dn)) {
 510                 phydev = of_phy_find_device(port_dn);
 511                 if (phydev) {
 512                         phy_device_free(phydev);
 513                         fixed_phy_unregister(phydev);
 514                 }
 515         }
 516 }
 517
 518 static void dsa_switch_destroy(struct dsa_switch *ds)
 519 {
 520         int port;
 521
 522 #ifdef CONFIG_NET_DSA_HWMON
 523         if (ds->hwmon_dev)
 524                 hwmon_device_unregister(ds->hwmon_dev);
 525 #endif
 526
 527         /* Destroy network devices for physical switch ports. */
 528         for (port = 0; port < DSA_MAX_PORTS; port++) {
 529                 if (!(ds->enabled_port_mask & (1 << port)))
 530                         continue;
 531
 532                 if (!ds->ports[port].netdev)
 533                         continue;
 534
 535                 dsa_slave_destroy(ds->ports[port].netdev);
 536         }
 537
 538         /* Disable configuration of the CPU and DSA ports */
 539         for (port = 0; port < DSA_MAX_PORTS; port++) {
 540                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 541                         continue;
 542                 dsa_cpu_dsa_destroy(ds->ports[port].dn);
 543
 544                 /* Clearing a bit which is not set does no harm */
 545                 ds->cpu_port_mask |= ~(1 << port);
 546                 ds->dsa_port_mask |= ~(1 << port);
 547         }
 548
 549         if (ds->slave_mii_bus && ds->ops->phy_read)
 550                 mdiobus_unregister(ds->slave_mii_bus);
 551 }
 552
 553 #ifdef CONFIG_PM_SLEEP
 554 int dsa_switch_suspend(struct dsa_switch *ds)
 555 {
 556         int i, ret = 0;
 557
 558         /* Suspend slave network devices */
 559         for (i = 0; i < DSA_MAX_PORTS; i++) {
 560                 if (!dsa_is_port_initialized(ds, i))
 561                         continue;
 562
 563                 ret = dsa_slave_suspend(ds->ports[i].netdev);
 564                 if (ret)
 565                         return ret;
 566         }
 567
 568         if (ds->ops->suspend)
 569                 ret = ds->ops->suspend(ds);
 570
 571         return ret;
 572 }
 573 EXPORT_SYMBOL_GPL(dsa_switch_suspend);
 574
 575 int dsa_switch_resume(struct dsa_switch *ds)
 576 {
 577         int i, ret = 0;
 578
 579         if (ds->ops->resume)
 580                 ret = ds->ops->resume(ds);
 581
 582         if (ret)
 583                 return ret;
 584
 585         /* Resume slave network devices */
 586         for (i = 0; i < DSA_MAX_PORTS; i++) {
 587                 if (!dsa_is_port_initialized(ds, i))
 588                         continue;
 589
 590                 ret = dsa_slave_resume(ds->ports[i].netdev);
 591                 if (ret)
 592                         return ret;
 593         }
 594
 595         return 0;
 596 }
 597 EXPORT_SYMBOL_GPL(dsa_switch_resume);
 598 #endif
 599
 600 /* platform driver init and cleanup *****************************************/
 601 static int dev_is_class(struct device *dev, void *class)
 602 {
 603         if (dev->class != NULL && !strcmp(dev->class->name, class))
 604                 return 1;
 605
 606         return 0;
 607 }
 608
 609 static struct device *dev_find_class(struct device *parent, char *class)
 610 {
 611         if (dev_is_class(parent, class)) {
 612                 get_device(parent);
 613                 return parent;
 614         }
 615
 616         return device_find_child(parent, class, dev_is_class);
 617 }
 618
 619 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 620 {
 621         struct device *d;
 622
 623         d = dev_find_class(dev, "mdio_bus");
 624         if (d != NULL) {
 625                 struct mii_bus *bus;
 626
 627                 bus = to_mii_bus(d);
 628                 put_device(d);
 629
 630                 return bus;
 631         }
 632
 633         return NULL;
 634 }
 635 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 636
 637 static struct net_device *dev_to_net_device(struct device *dev)
 638 {
 639         struct device *d;
 640
 641         d = dev_find_class(dev, "net");
 642         if (d != NULL) {
 643                 struct net_device *nd;
 644
 645                 nd = to_net_dev(d);
 646                 dev_hold(nd);
 647                 put_device(d);
 648
 649                 return nd;
 650         }
 651
 652         return NULL;
 653 }
 654
 655 #ifdef CONFIG_OF
 656 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 657                                         struct dsa_chip_data *cd,
 658                                         int chip_index, int port_index,
 659                                         struct device_node *link)
 660 {
 661         const __be32 *reg;
 662         int link_sw_addr;
 663         struct device_node *parent_sw;
 664         int len;
 665
 666         parent_sw = of_get_parent(link);
 667         if (!parent_sw)
 668                 return -EINVAL;
 669
 670         reg = of_get_property(parent_sw, "reg", &len);
 671         if (!reg || (len != sizeof(*reg) * 2))
 672                 return -EINVAL;
 673
 674         /*
 675          * Get the destination switch number from the second field of its 'reg'
 676          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 677          */
 678         link_sw_addr = be32_to_cpup(reg + 1);
 679
 680         if (link_sw_addr >= pd->nr_chips)
 681                 return -EINVAL;
 682
 683         cd->rtable[link_sw_addr] = port_index;
 684
 685         return 0;
 686 }
 687
 688 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 689                               struct dsa_chip_data *cd,
 690                               int chip_index, int port_index,
 691                               struct device_node *port,
 692                               const char *port_name)
 693 {
 694         struct device_node *link;
 695         int link_index;
 696         int ret;
 697
 698         for (link_index = 0;; link_index++) {
 699                 link = of_parse_phandle(port, "link", link_index);
 700                 if (!link)
 701                         break;
 702
 703                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 704                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 705                                                          port_index, link);
 706                         if (ret)
 707                                 return ret;
 708                 }
 709         }
 710         return 0;
 711 }
 712
 713 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 714 {
 715         int i;
 716         int port_index;
 717
 718         for (i = 0; i < pd->nr_chips; i++) {
 719                 port_index = 0;
 720                 while (port_index < DSA_MAX_PORTS) {
 721                         kfree(pd->chip[i].port_names[port_index]);
 722                         port_index++;
 723                 }
 724
 725                 /* Drop our reference to the MDIO bus device */
 726                 if (pd->chip[i].host_dev)
 727                         put_device(pd->chip[i].host_dev);
 728         }
 729         kfree(pd->chip);
 730 }
 731
 732 static int dsa_of_probe(struct device *dev)
 733 {
 734         struct device_node *np = dev->of_node;
 735         struct device_node *child, *mdio, *ethernet, *port;
 736         struct mii_bus *mdio_bus, *mdio_bus_switch;
 737         struct net_device *ethernet_dev;
 738         struct dsa_platform_data *pd;
 739         struct dsa_chip_data *cd;
 740         const char *port_name;
 741         int chip_index, port_index;
 742         const unsigned int *sw_addr, *port_reg;
 743         u32 eeprom_len;
 744         int ret;
 745
 746         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 747         if (!mdio)
 748                 return -EINVAL;
 749
 750         mdio_bus = of_mdio_find_bus(mdio);
 751         if (!mdio_bus)
 752                 return -EPROBE_DEFER;
 753
 754         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 755         if (!ethernet) {
 756                 ret = -EINVAL;
 757                 goto out_put_mdio;
 758         }
 759
 760         ethernet_dev = of_find_net_device_by_node(ethernet);
 761         if (!ethernet_dev) {
 762                 ret = -EPROBE_DEFER;
 763                 goto out_put_mdio;
 764         }
 765
 766         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 767         if (!pd) {
 768                 ret = -ENOMEM;
 769                 goto out_put_ethernet;
 770         }
 771
 772         dev->platform_data = pd;
 773         pd->of_netdev = ethernet_dev;
 774         pd->nr_chips = of_get_available_child_count(np);
 775         if (pd->nr_chips > DSA_MAX_SWITCHES)
 776                 pd->nr_chips = DSA_MAX_SWITCHES;
 777
 778         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 779                            GFP_KERNEL);
 780         if (!pd->chip) {
 781                 ret = -ENOMEM;
 782                 goto out_free;
 783         }
 784
 785         chip_index = -1;
 786         for_each_available_child_of_node(np, child) {
 787                 int i;
 788
 789                 chip_index++;
 790                 cd = &pd->chip[chip_index];
 791
 792                 cd->of_node = child;
 793
 794                 /* Initialize the routing table */
 795                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
 796                         cd->rtable[i] = DSA_RTABLE_NONE;
 797
 798                 /* When assigning the host device, increment its refcount */
 799                 cd->host_dev = get_device(&mdio_bus->dev);
 800
 801                 sw_addr = of_get_property(child, "reg", NULL);
 802                 if (!sw_addr)
 803                         continue;
 804
 805                 cd->sw_addr = be32_to_cpup(sw_addr);
 806                 if (cd->sw_addr >= PHY_MAX_ADDR)
 807                         continue;
 808
 809                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 810                         cd->eeprom_len = eeprom_len;
 811
 812                 mdio = of_parse_phandle(child, "mii-bus", 0);
 813                 if (mdio) {
 814                         mdio_bus_switch = of_mdio_find_bus(mdio);
 815                         if (!mdio_bus_switch) {
 816                                 ret = -EPROBE_DEFER;
 817                                 goto out_free_chip;
 818                         }
 819
 820                         /* Drop the mdio_bus device ref, replacing the host
 821                          * device with the mdio_bus_switch device, keeping
 822                          * the refcount from of_mdio_find_bus() above.
 823                          */
 824                         put_device(cd->host_dev);
 825                         cd->host_dev = &mdio_bus_switch->dev;
 826                 }
 827
 828                 for_each_available_child_of_node(child, port) {
 829                         port_reg = of_get_property(port, "reg", NULL);
 830                         if (!port_reg)
 831                                 continue;
 832
 833                         port_index = be32_to_cpup(port_reg);
 834                         if (port_index >= DSA_MAX_PORTS)
 835                                 break;
 836
 837                         port_name = of_get_property(port, "label", NULL);
 838                         if (!port_name)
 839                                 continue;
 840
 841                         cd->port_dn[port_index] = port;
 842
 843                         cd->port_names[port_index] = kstrdup(port_name,
 844                                         GFP_KERNEL);
 845                         if (!cd->port_names[port_index]) {
 846                                 ret = -ENOMEM;
 847                                 goto out_free_chip;
 848                         }
 849
 850                         ret = dsa_of_probe_links(pd, cd, chip_index,
 851                                                  port_index, port, port_name);
 852                         if (ret)
 853                                 goto out_free_chip;
 854
 855                 }
 856         }
 857
 858         /* The individual chips hold their own refcount on the mdio bus,
 859          * so drop ours */
 860         put_device(&mdio_bus->dev);
 861
 862         return 0;
 863
 864 out_free_chip:
 865         dsa_of_free_platform_data(pd);
 866 out_free:
 867         kfree(pd);
 868         dev->platform_data = NULL;
 869 out_put_ethernet:
 870         put_device(&ethernet_dev->dev);
 871 out_put_mdio:
 872         put_device(&mdio_bus->dev);
 873         return ret;
 874 }
 875
 876 static void dsa_of_remove(struct device *dev)
 877 {
 878         struct dsa_platform_data *pd = dev->platform_data;
 879
 880         if (!dev->of_node)
 881                 return;
 882
 883         dsa_of_free_platform_data(pd);
 884         put_device(&pd->of_netdev->dev);
 885         kfree(pd);
 886 }
 887 #else
 888 static inline int dsa_of_probe(struct device *dev)
 889 {
 890         return 0;
 891 }
 892
 893 static inline void dsa_of_remove(struct device *dev)
 894 {
 895 }
 896 #endif
 897
 898 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 899                          struct device *parent, struct dsa_platform_data *pd)
 900 {
 901         int i;
 902         unsigned configured = 0;
 903
 904         dst->pd = pd;
 905         dst->master_netdev = dev;
 906         dst->cpu_switch = -1;
 907         dst->cpu_port = -1;
 908
 909         for (i = 0; i < pd->nr_chips; i++) {
 910                 struct dsa_switch *ds;
 911
 912                 ds = dsa_switch_setup(dst, i, parent, pd->chip[i].host_dev);
 913                 if (IS_ERR(ds)) {
 914                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 915                                    i, PTR_ERR(ds));
 916                         continue;
 917                 }
 918
 919                 dst->ds[i] = ds;
 920
 921                 ++configured;
 922         }
 923
 924         /*
 925          * If no switch was found, exit cleanly
 926          */
 927         if (!configured)
 928                 return -EPROBE_DEFER;
 929
 930         /*
 931          * If we use a tagging format that doesn't have an ethertype
 932          * field, make sure that all packets from this point on get
 933          * sent to the tag format's receive function.
 934          */
 935         wmb();
 936         dev->dsa_ptr = (void *)dst;
 937
 938         return 0;
 939 }
 940
 941 static int dsa_probe(struct platform_device *pdev)
 942 {
 943         struct dsa_platform_data *pd = pdev->dev.platform_data;
 944         struct net_device *dev;
 945         struct dsa_switch_tree *dst;
 946         int ret;
 947
 948         pr_notice_once("Distributed Switch Architecture driver version %s\n",
 949                        dsa_driver_version);
 950
 951         if (pdev->dev.of_node) {
 952                 ret = dsa_of_probe(&pdev->dev);
 953                 if (ret)
 954                         return ret;
 955
 956                 pd = pdev->dev.platform_data;
 957         }
 958
 959         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 960                 return -EINVAL;
 961
 962         if (pd->of_netdev) {
 963                 dev = pd->of_netdev;
 964                 dev_hold(dev);
 965         } else {
 966                 dev = dev_to_net_device(pd->netdev);
 967         }
 968         if (dev == NULL) {
 969                 ret = -EPROBE_DEFER;
 970                 goto out;
 971         }
 972
 973         if (dev->dsa_ptr != NULL) {
 974                 dev_put(dev);
 975                 ret = -EEXIST;
 976                 goto out;
 977         }
 978
 979         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 980         if (dst == NULL) {
 981                 dev_put(dev);
 982                 ret = -ENOMEM;
 983                 goto out;
 984         }
 985
 986         platform_set_drvdata(pdev, dst);
 987
 988         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 989         if (ret) {
 990                 dev_put(dev);
 991                 goto out;
 992         }
 993
 994         return 0;
 995
 996 out:
 997         dsa_of_remove(&pdev->dev);
 998
 999         return ret;
1000 }
1001
1002 static void dsa_remove_dst(struct dsa_switch_tree *dst)
1003 {
1004         int i;
1005
1006         dst->master_netdev->dsa_ptr = NULL;
1007
1008         /* If we used a tagging format that doesn't have an ethertype
1009          * field, make sure that all packets from this point get sent
1010          * without the tag and go through the regular receive path.
1011          */
1012         wmb();
1013
1014         for (i = 0; i < dst->pd->nr_chips; i++) {
1015                 struct dsa_switch *ds = dst->ds[i];
1016
1017                 if (ds)
1018                         dsa_switch_destroy(ds);
1019         }
1020
1021         dsa_cpu_port_ethtool_restore(dst->ds[0]);
1022
1023         dev_put(dst->master_netdev);
1024 }
1025
1026 static int dsa_remove(struct platform_device *pdev)
1027 {
1028         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1029
1030         dsa_remove_dst(dst);
1031         dsa_of_remove(&pdev->dev);
1032
1033         return 0;
1034 }
1035
1036 static void dsa_shutdown(struct platform_device *pdev)
1037 {
1038 }
1039
1040 static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,
1041                           struct packet_type *pt, struct net_device *orig_dev)
1042 {
1043         struct dsa_switch_tree *dst = dev->dsa_ptr;
1044
1045         if (unlikely(dst == NULL)) {
1046                 kfree_skb(skb);
1047                 return 0;
1048         }
1049
1050         return dst->rcv(skb, dev, pt, orig_dev);
1051 }
1052
1053 static struct packet_type dsa_pack_type __read_mostly = {
1054         .type   = cpu_to_be16(ETH_P_XDSA),
1055         .func   = dsa_switch_rcv,
1056 };
1057
1058 static struct notifier_block dsa_netdevice_nb __read_mostly = {
1059         .notifier_call  = dsa_slave_netdevice_event,
1060 };
1061
1062 #ifdef CONFIG_PM_SLEEP
1063 static int dsa_suspend(struct device *d)
1064 {
1065         struct platform_device *pdev = to_platform_device(d);
1066         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1067         int i, ret = 0;
1068
1069         for (i = 0; i < dst->pd->nr_chips; i++) {
1070                 struct dsa_switch *ds = dst->ds[i];
1071
1072                 if (ds != NULL)
1073                         ret = dsa_switch_suspend(ds);
1074         }
1075
1076         return ret;
1077 }
1078
1079 static int dsa_resume(struct device *d)
1080 {
1081         struct platform_device *pdev = to_platform_device(d);
1082         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
1083         int i, ret = 0;
1084
1085         for (i = 0; i < dst->pd->nr_chips; i++) {
1086                 struct dsa_switch *ds = dst->ds[i];
1087
1088                 if (ds != NULL)
1089                         ret = dsa_switch_resume(ds);
1090         }
1091
1092         return ret;
1093 }
1094 #endif
1095
1096 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
1097
1098 static const struct of_device_id dsa_of_match_table[] = {
1099         { .compatible = "marvell,dsa", },
1100         {}
1101 };
1102 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
1103
1104 static struct platform_driver dsa_driver = {
1105         .probe          = dsa_probe,
1106         .remove         = dsa_remove,
1107         .shutdown       = dsa_shutdown,
1108         .driver = {
1109                 .name   = "dsa",
1110                 .of_match_table = dsa_of_match_table,
1111                 .pm     = &dsa_pm_ops,
1112         },
1113 };
1114
1115 static int __init dsa_init_module(void)
1116 {
1117         int rc;
1118
1119         register_netdevice_notifier(&dsa_netdevice_nb);
1120
1121         rc = platform_driver_register(&dsa_driver);
1122         if (rc)
1123                 return rc;
1124
1125         dev_add_pack(&dsa_pack_type);
1126
1127         return 0;
1128 }
1129 module_init(dsa_init_module);
1130
1131 static void __exit dsa_cleanup_module(void)
1132 {
1133         unregister_netdevice_notifier(&dsa_netdevice_nb);
1134         dev_remove_pack(&dsa_pack_type);
1135         platform_driver_unregister(&dsa_driver);
1136 }
1137 module_exit(dsa_cleanup_module);
1138
1139 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
1140 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
1141 MODULE_LICENSE("GPL");
1142 MODULE_ALIAS("platform:dsa");