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