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