net/dsa/legacy.c

   1 /*
   2  * net/dsa/legacy.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/device.h>
  13 #include <linux/list.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/of_mdio.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/of_net.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/sysfs.h>
  23 #include <linux/phy_fixed.h>
  24 #include <linux/etherdevice.h>
  25
  26 #include "dsa_priv.h"
  27
  28 /* switch driver registration ***********************************************/
  29 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
  30 static LIST_HEAD(dsa_switch_drivers);
  31
  32 void register_switch_driver(struct dsa_switch_driver *drv)
  33 {
  34         mutex_lock(&dsa_switch_drivers_mutex);
  35         list_add_tail(&drv->list, &dsa_switch_drivers);
  36         mutex_unlock(&dsa_switch_drivers_mutex);
  37 }
  38 EXPORT_SYMBOL_GPL(register_switch_driver);
  39
  40 void unregister_switch_driver(struct dsa_switch_driver *drv)
  41 {
  42         mutex_lock(&dsa_switch_drivers_mutex);
  43         list_del_init(&drv->list);
  44         mutex_unlock(&dsa_switch_drivers_mutex);
  45 }
  46 EXPORT_SYMBOL_GPL(unregister_switch_driver);
  47
  48 static const struct dsa_switch_ops *
  49 dsa_switch_probe(struct device *parent, struct device *host_dev, int sw_addr,
  50                  const char **_name, void **priv)
  51 {
  52         const struct dsa_switch_ops *ret;
  53         struct list_head *list;
  54         const char *name;
  55
  56         ret = NULL;
  57         name = NULL;
  58
  59         mutex_lock(&dsa_switch_drivers_mutex);
  60         list_for_each(list, &dsa_switch_drivers) {
  61                 const struct dsa_switch_ops *ops;
  62                 struct dsa_switch_driver *drv;
  63
  64                 drv = list_entry(list, struct dsa_switch_driver, list);
  65                 ops = drv->ops;
  66
  67                 name = ops->probe(parent, host_dev, sw_addr, priv);
  68                 if (name != NULL) {
  69                         ret = ops;
  70                         break;
  71                 }
  72         }
  73         mutex_unlock(&dsa_switch_drivers_mutex);
  74
  75         *_name = name;
  76
  77         return ret;
  78 }
  79
  80 /* basic switch operations **************************************************/
  81 static int dsa_cpu_dsa_setups(struct dsa_switch *ds)
  82 {
  83         int ret, port;
  84
  85         for (port = 0; port < ds->num_ports; port++) {
  86                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
  87                         continue;
  88
  89                 ret = dsa_port_link_register_of(&ds->ports[port]);
  90                 if (ret)
  91                         return ret;
  92         }
  93         return 0;
  94 }
  95
  96 static int dsa_switch_setup_one(struct dsa_switch *ds,
  97                                 struct net_device *master)
  98 {
  99         const struct dsa_switch_ops *ops = ds->ops;
 100         struct dsa_switch_tree *dst = ds->dst;
 101         struct dsa_chip_data *cd = ds->cd;
 102         bool valid_name_found = false;
 103         int index = ds->index;
 104         struct dsa_port *dp;
 105         int i, ret;
 106
 107         /*
 108          * Validate supplied switch configuration.
 109          */
 110         for (i = 0; i < ds->num_ports; i++) {
 111                 char *name;
 112
 113                 dp = &ds->ports[i];
 114
 115                 name = cd->port_names[i];
 116                 if (name == NULL)
 117                         continue;
 118                 dp->name = name;
 119
 120                 if (!strcmp(name, "cpu")) {
 121                         if (dst->cpu_dp) {
 122                                 netdev_err(master,
 123                                            "multiple cpu ports?!\n");
 124                                 return -EINVAL;
 125                         }
 126                         dst->cpu_dp = &ds->ports[i];
 127                         dst->cpu_dp->master = master;
 128                         dp->type = DSA_PORT_TYPE_CPU;
 129                 } else if (!strcmp(name, "dsa")) {
 130                         dp->type = DSA_PORT_TYPE_DSA;
 131                 } else {
 132                         dp->type = DSA_PORT_TYPE_USER;
 133                 }
 134                 valid_name_found = true;
 135         }
 136
 137         if (!valid_name_found && i == ds->num_ports)
 138                 return -EINVAL;
 139
 140         /* Make the built-in MII bus mask match the number of ports,
 141          * switch drivers can override this later
 142          */
 143         ds->phys_mii_mask |= dsa_user_ports(ds);
 144
 145         /*
 146          * If the CPU connects to this switch, set the switch tree
 147          * tagging protocol to the preferred tagging format of this
 148          * switch.
 149          */
 150         if (dst->cpu_dp->ds == ds) {
 151                 const struct dsa_device_ops *tag_ops;
 152                 enum dsa_tag_protocol tag_protocol;
 153
 154                 tag_protocol = ops->get_tag_protocol(ds, dst->cpu_dp->index);
 155                 tag_ops = dsa_resolve_tag_protocol(tag_protocol);
 156                 if (IS_ERR(tag_ops))
 157                         return PTR_ERR(tag_ops);
 158
 159                 dst->cpu_dp->tag_ops = tag_ops;
 160
 161                 /* Few copies for faster access in master receive hot path */
 162                 dst->cpu_dp->rcv = dst->cpu_dp->tag_ops->rcv;
 163                 dst->cpu_dp->dst = dst;
 164         }
 165
 166         memcpy(ds->rtable, cd->rtable, sizeof(ds->rtable));
 167
 168         /*
 169          * Do basic register setup.
 170          */
 171         ret = ops->setup(ds);
 172         if (ret < 0)
 173                 return ret;
 174
 175         ret = dsa_switch_register_notifier(ds);
 176         if (ret)
 177                 return ret;
 178
 179         if (!ds->slave_mii_bus && ops->phy_read) {
 180                 ds->slave_mii_bus = devm_mdiobus_alloc(ds->dev);
 181                 if (!ds->slave_mii_bus)
 182                         return -ENOMEM;
 183                 dsa_slave_mii_bus_init(ds);
 184
 185                 ret = mdiobus_register(ds->slave_mii_bus);
 186                 if (ret < 0)
 187                         return ret;
 188         }
 189
 190         /*
 191          * Create network devices for physical switch ports.
 192          */
 193         for (i = 0; i < ds->num_ports; i++) {
 194                 ds->ports[i].dn = cd->port_dn[i];
 195                 ds->ports[i].cpu_dp = dst->cpu_dp;
 196
 197                 if (!dsa_is_user_port(ds, i))
 198                         continue;
 199
 200                 ret = dsa_slave_create(&ds->ports[i]);
 201                 if (ret < 0)
 202                         netdev_err(master, "[%d]: can't create dsa slave device for port %d(%s): %d\n",
 203                                    index, i, cd->port_names[i], ret);
 204         }
 205
 206         /* Perform configuration of the CPU and DSA ports */
 207         ret = dsa_cpu_dsa_setups(ds);
 208         if (ret < 0)
 209                 netdev_err(master, "[%d] : can't configure CPU and DSA ports\n",
 210                            index);
 211
 212         return 0;
 213 }
 214
 215 static struct dsa_switch *
 216 dsa_switch_setup(struct dsa_switch_tree *dst, struct net_device *master,
 217                  int index, struct device *parent, struct device *host_dev)
 218 {
 219         struct dsa_chip_data *cd = dst->pd->chip + index;
 220         const struct dsa_switch_ops *ops;
 221         struct dsa_switch *ds;
 222         int ret;
 223         const char *name;
 224         void *priv;
 225
 226         /*
 227          * Probe for switch model.
 228          */
 229         ops = dsa_switch_probe(parent, host_dev, cd->sw_addr, &name, &priv);
 230         if (!ops) {
 231                 netdev_err(master, "[%d]: could not detect attached switch\n",
 232                            index);
 233                 return ERR_PTR(-EINVAL);
 234         }
 235         netdev_info(master, "[%d]: detected a %s switch\n",
 236                     index, name);
 237
 238
 239         /*
 240          * Allocate and initialise switch state.
 241          */
 242         ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
 243         if (!ds)
 244                 return ERR_PTR(-ENOMEM);
 245
 246         ds->dst = dst;
 247         ds->index = index;
 248         ds->cd = cd;
 249         ds->ops = ops;
 250         ds->priv = priv;
 251
 252         ret = dsa_switch_setup_one(ds, master);
 253         if (ret)
 254                 return ERR_PTR(ret);
 255
 256         return ds;
 257 }
 258
 259 static void dsa_switch_destroy(struct dsa_switch *ds)
 260 {
 261         int port;
 262
 263         /* Destroy network devices for physical switch ports. */
 264         for (port = 0; port < ds->num_ports; port++) {
 265                 if (!dsa_is_user_port(ds, port))
 266                         continue;
 267
 268                 if (!ds->ports[port].slave)
 269                         continue;
 270
 271                 dsa_slave_destroy(ds->ports[port].slave);
 272         }
 273
 274         /* Disable configuration of the CPU and DSA ports */
 275         for (port = 0; port < ds->num_ports; port++) {
 276                 if (!(dsa_is_cpu_port(ds, port) || dsa_is_dsa_port(ds, port)))
 277                         continue;
 278                 dsa_port_link_unregister_of(&ds->ports[port]);
 279         }
 280
 281         if (ds->slave_mii_bus && ds->ops->phy_read)
 282                 mdiobus_unregister(ds->slave_mii_bus);
 283
 284         dsa_switch_unregister_notifier(ds);
 285 }
 286
 287 /* platform driver init and cleanup *****************************************/
 288 static int dev_is_class(struct device *dev, void *class)
 289 {
 290         if (dev->class != NULL && !strcmp(dev->class->name, class))
 291                 return 1;
 292
 293         return 0;
 294 }
 295
 296 static struct device *dev_find_class(struct device *parent, char *class)
 297 {
 298         if (dev_is_class(parent, class)) {
 299                 get_device(parent);
 300                 return parent;
 301         }
 302
 303         return device_find_child(parent, class, dev_is_class);
 304 }
 305
 306 struct mii_bus *dsa_host_dev_to_mii_bus(struct device *dev)
 307 {
 308         struct device *d;
 309
 310         d = dev_find_class(dev, "mdio_bus");
 311         if (d != NULL) {
 312                 struct mii_bus *bus;
 313
 314                 bus = to_mii_bus(d);
 315                 put_device(d);
 316
 317                 return bus;
 318         }
 319
 320         return NULL;
 321 }
 322 EXPORT_SYMBOL_GPL(dsa_host_dev_to_mii_bus);
 323
 324 #ifdef CONFIG_OF
 325 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
 326                                         struct dsa_chip_data *cd,
 327                                         int chip_index, int port_index,
 328                                         struct device_node *link)
 329 {
 330         const __be32 *reg;
 331         int link_sw_addr;
 332         struct device_node *parent_sw;
 333         int len;
 334
 335         parent_sw = of_get_parent(link);
 336         if (!parent_sw)
 337                 return -EINVAL;
 338
 339         reg = of_get_property(parent_sw, "reg", &len);
 340         if (!reg || (len != sizeof(*reg) * 2))
 341                 return -EINVAL;
 342
 343         /*
 344          * Get the destination switch number from the second field of its 'reg'
 345          * property, i.e. for "reg = <0x19 1>" sw_addr is '1'.
 346          */
 347         link_sw_addr = be32_to_cpup(reg + 1);
 348
 349         if (link_sw_addr >= pd->nr_chips)
 350                 return -EINVAL;
 351
 352         cd->rtable[link_sw_addr] = port_index;
 353
 354         return 0;
 355 }
 356
 357 static int dsa_of_probe_links(struct dsa_platform_data *pd,
 358                               struct dsa_chip_data *cd,
 359                               int chip_index, int port_index,
 360                               struct device_node *port,
 361                               const char *port_name)
 362 {
 363         struct device_node *link;
 364         int link_index;
 365         int ret;
 366
 367         for (link_index = 0;; link_index++) {
 368                 link = of_parse_phandle(port, "link", link_index);
 369                 if (!link)
 370                         break;
 371
 372                 if (!strcmp(port_name, "dsa") && pd->nr_chips > 1) {
 373                         ret = dsa_of_setup_routing_table(pd, cd, chip_index,
 374                                                          port_index, link);
 375                         if (ret)
 376                                 return ret;
 377                 }
 378         }
 379         return 0;
 380 }
 381
 382 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
 383 {
 384         int i;
 385         int port_index;
 386
 387         for (i = 0; i < pd->nr_chips; i++) {
 388                 port_index = 0;
 389                 while (port_index < DSA_MAX_PORTS) {
 390                         kfree(pd->chip[i].port_names[port_index]);
 391                         port_index++;
 392                 }
 393
 394                 /* Drop our reference to the MDIO bus device */
 395                 put_device(pd->chip[i].host_dev);
 396         }
 397         kfree(pd->chip);
 398 }
 399
 400 static int dsa_of_probe(struct device *dev)
 401 {
 402         struct device_node *np = dev->of_node;
 403         struct device_node *child, *mdio, *ethernet, *port;
 404         struct mii_bus *mdio_bus, *mdio_bus_switch;
 405         struct net_device *ethernet_dev;
 406         struct dsa_platform_data *pd;
 407         struct dsa_chip_data *cd;
 408         const char *port_name;
 409         int chip_index, port_index;
 410         const unsigned int *sw_addr, *port_reg;
 411         u32 eeprom_len;
 412         int ret;
 413
 414         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
 415         if (!mdio)
 416                 return -EINVAL;
 417
 418         mdio_bus = of_mdio_find_bus(mdio);
 419         if (!mdio_bus)
 420                 return -EPROBE_DEFER;
 421
 422         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
 423         if (!ethernet) {
 424                 ret = -EINVAL;
 425                 goto out_put_mdio;
 426         }
 427
 428         ethernet_dev = of_find_net_device_by_node(ethernet);
 429         if (!ethernet_dev) {
 430                 ret = -EPROBE_DEFER;
 431                 goto out_put_mdio;
 432         }
 433
 434         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
 435         if (!pd) {
 436                 ret = -ENOMEM;
 437                 goto out_put_ethernet;
 438         }
 439
 440         dev->platform_data = pd;
 441         pd->of_netdev = ethernet_dev;
 442         pd->nr_chips = of_get_available_child_count(np);
 443         if (pd->nr_chips > DSA_MAX_SWITCHES)
 444                 pd->nr_chips = DSA_MAX_SWITCHES;
 445
 446         pd->chip = kcalloc(pd->nr_chips, sizeof(struct dsa_chip_data),
 447                            GFP_KERNEL);
 448         if (!pd->chip) {
 449                 ret = -ENOMEM;
 450                 goto out_free;
 451         }
 452
 453         chip_index = -1;
 454         for_each_available_child_of_node(np, child) {
 455                 int i;
 456
 457                 chip_index++;
 458                 cd = &pd->chip[chip_index];
 459
 460                 cd->of_node = child;
 461
 462                 /* Initialize the routing table */
 463                 for (i = 0; i < DSA_MAX_SWITCHES; ++i)
 464                         cd->rtable[i] = DSA_RTABLE_NONE;
 465
 466                 /* When assigning the host device, increment its refcount */
 467                 cd->host_dev = get_device(&mdio_bus->dev);
 468
 469                 sw_addr = of_get_property(child, "reg", NULL);
 470                 if (!sw_addr)
 471                         continue;
 472
 473                 cd->sw_addr = be32_to_cpup(sw_addr);
 474                 if (cd->sw_addr >= PHY_MAX_ADDR)
 475                         continue;
 476
 477                 if (!of_property_read_u32(child, "eeprom-length", &eeprom_len))
 478                         cd->eeprom_len = eeprom_len;
 479
 480                 mdio = of_parse_phandle(child, "mii-bus", 0);
 481                 if (mdio) {
 482                         mdio_bus_switch = of_mdio_find_bus(mdio);
 483                         if (!mdio_bus_switch) {
 484                                 ret = -EPROBE_DEFER;
 485                                 goto out_free_chip;
 486                         }
 487
 488                         /* Drop the mdio_bus device ref, replacing the host
 489                          * device with the mdio_bus_switch device, keeping
 490                          * the refcount from of_mdio_find_bus() above.
 491                          */
 492                         put_device(cd->host_dev);
 493                         cd->host_dev = &mdio_bus_switch->dev;
 494                 }
 495
 496                 for_each_available_child_of_node(child, port) {
 497                         port_reg = of_get_property(port, "reg", NULL);
 498                         if (!port_reg)
 499                                 continue;
 500
 501                         port_index = be32_to_cpup(port_reg);
 502                         if (port_index >= DSA_MAX_PORTS)
 503                                 break;
 504
 505                         port_name = of_get_property(port, "label", NULL);
 506                         if (!port_name)
 507                                 continue;
 508
 509                         cd->port_dn[port_index] = port;
 510
 511                         cd->port_names[port_index] = kstrdup(port_name,
 512                                         GFP_KERNEL);
 513                         if (!cd->port_names[port_index]) {
 514                                 ret = -ENOMEM;
 515                                 goto out_free_chip;
 516                         }
 517
 518                         ret = dsa_of_probe_links(pd, cd, chip_index,
 519                                                  port_index, port, port_name);
 520                         if (ret)
 521                                 goto out_free_chip;
 522
 523                 }
 524         }
 525
 526         /* The individual chips hold their own refcount on the mdio bus,
 527          * so drop ours */
 528         put_device(&mdio_bus->dev);
 529
 530         return 0;
 531
 532 out_free_chip:
 533         dsa_of_free_platform_data(pd);
 534 out_free:
 535         kfree(pd);
 536         dev->platform_data = NULL;
 537 out_put_ethernet:
 538         put_device(&ethernet_dev->dev);
 539 out_put_mdio:
 540         put_device(&mdio_bus->dev);
 541         return ret;
 542 }
 543
 544 static void dsa_of_remove(struct device *dev)
 545 {
 546         struct dsa_platform_data *pd = dev->platform_data;
 547
 548         if (!dev->of_node)
 549                 return;
 550
 551         dsa_of_free_platform_data(pd);
 552         put_device(&pd->of_netdev->dev);
 553         kfree(pd);
 554 }
 555 #else
 556 static inline int dsa_of_probe(struct device *dev)
 557 {
 558         return 0;
 559 }
 560
 561 static inline void dsa_of_remove(struct device *dev)
 562 {
 563 }
 564 #endif
 565
 566 static int dsa_setup_dst(struct dsa_switch_tree *dst, struct net_device *dev,
 567                          struct device *parent, struct dsa_platform_data *pd)
 568 {
 569         int i;
 570         unsigned configured = 0;
 571
 572         dst->pd = pd;
 573
 574         for (i = 0; i < pd->nr_chips; i++) {
 575                 struct dsa_switch *ds;
 576
 577                 ds = dsa_switch_setup(dst, dev, i, parent, pd->chip[i].host_dev);
 578                 if (IS_ERR(ds)) {
 579                         netdev_err(dev, "[%d]: couldn't create dsa switch instance (error %ld)\n",
 580                                    i, PTR_ERR(ds));
 581                         continue;
 582                 }
 583
 584                 dst->ds[i] = ds;
 585
 586                 ++configured;
 587         }
 588
 589         /*
 590          * If no switch was found, exit cleanly
 591          */
 592         if (!configured)
 593                 return -EPROBE_DEFER;
 594
 595         return dsa_master_setup(dst->cpu_dp->master, dst->cpu_dp);
 596 }
 597
 598 static int dsa_probe(struct platform_device *pdev)
 599 {
 600         struct dsa_platform_data *pd = pdev->dev.platform_data;
 601         struct net_device *dev;
 602         struct dsa_switch_tree *dst;
 603         int ret;
 604
 605         if (pdev->dev.of_node) {
 606                 ret = dsa_of_probe(&pdev->dev);
 607                 if (ret)
 608                         return ret;
 609
 610                 pd = pdev->dev.platform_data;
 611         }
 612
 613         if (pd == NULL || (pd->netdev == NULL && pd->of_netdev == NULL))
 614                 return -EINVAL;
 615
 616         if (pd->of_netdev) {
 617                 dev = pd->of_netdev;
 618                 dev_hold(dev);
 619         } else {
 620                 dev = dsa_dev_to_net_device(pd->netdev);
 621         }
 622         if (dev == NULL) {
 623                 ret = -EPROBE_DEFER;
 624                 goto out;
 625         }
 626
 627         if (dev->dsa_ptr != NULL) {
 628                 dev_put(dev);
 629                 ret = -EEXIST;
 630                 goto out;
 631         }
 632
 633         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 634         if (dst == NULL) {
 635                 dev_put(dev);
 636                 ret = -ENOMEM;
 637                 goto out;
 638         }
 639
 640         platform_set_drvdata(pdev, dst);
 641
 642         ret = dsa_setup_dst(dst, dev, &pdev->dev, pd);
 643         if (ret) {
 644                 dev_put(dev);
 645                 goto out;
 646         }
 647
 648         return 0;
 649
 650 out:
 651         dsa_of_remove(&pdev->dev);
 652
 653         return ret;
 654 }
 655
 656 static void dsa_remove_dst(struct dsa_switch_tree *dst)
 657 {
 658         int i;
 659
 660         dsa_master_teardown(dst->cpu_dp->master);
 661
 662         for (i = 0; i < dst->pd->nr_chips; i++) {
 663                 struct dsa_switch *ds = dst->ds[i];
 664
 665                 if (ds)
 666                         dsa_switch_destroy(ds);
 667         }
 668
 669         dev_put(dst->cpu_dp->master);
 670 }
 671
 672 static int dsa_remove(struct platform_device *pdev)
 673 {
 674         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
 675
 676         dsa_remove_dst(dst);
 677         dsa_of_remove(&pdev->dev);
 678
 679         return 0;
 680 }
 681
 682 static void dsa_shutdown(struct platform_device *pdev)
 683 {
 684 }
 685
 686 #ifdef CONFIG_PM_SLEEP
 687 static int dsa_suspend(struct device *d)
 688 {
 689         struct dsa_switch_tree *dst = dev_get_drvdata(d);
 690         int i, ret = 0;
 691
 692         for (i = 0; i < dst->pd->nr_chips; i++) {
 693                 struct dsa_switch *ds = dst->ds[i];
 694
 695                 if (ds != NULL)
 696                         ret = dsa_switch_suspend(ds);
 697         }
 698
 699         return ret;
 700 }
 701
 702 static int dsa_resume(struct device *d)
 703 {
 704         struct dsa_switch_tree *dst = dev_get_drvdata(d);
 705         int i, ret = 0;
 706
 707         for (i = 0; i < dst->pd->nr_chips; i++) {
 708                 struct dsa_switch *ds = dst->ds[i];
 709
 710                 if (ds != NULL)
 711                         ret = dsa_switch_resume(ds);
 712         }
 713
 714         return ret;
 715 }
 716 #endif
 717
 718 static SIMPLE_DEV_PM_OPS(dsa_pm_ops, dsa_suspend, dsa_resume);
 719
 720 static const struct of_device_id dsa_of_match_table[] = {
 721         { .compatible = "marvell,dsa", },
 722         {}
 723 };
 724 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
 725
 726 static struct platform_driver dsa_driver = {
 727         .probe          = dsa_probe,
 728         .remove         = dsa_remove,
 729         .shutdown       = dsa_shutdown,
 730         .driver = {
 731                 .name   = "dsa",
 732                 .of_match_table = dsa_of_match_table,
 733                 .pm     = &dsa_pm_ops,
 734         },
 735 };
 736
 737 int dsa_legacy_register(void)
 738 {
 739         return platform_driver_register(&dsa_driver);
 740 }
 741
 742 void dsa_legacy_unregister(void)
 743 {
 744         platform_driver_unregister(&dsa_driver);
 745 }