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/list.h> 13 #include <linux/netdevice.h> 14 #include <linux/platform_device.h> 15 #include <linux/slab.h> 16 #include <linux/module.h> 17 #include <net/dsa.h> 18 #include <linux/of.h> 19 #include <linux/of_mdio.h> 20 #include <linux/of_platform.h> 21 #include "dsa_priv.h" 22 23 char dsa_driver_version[] = "0.1"; 24 25 26 /* switch driver registration ***********************************************/ 27 static DEFINE_MUTEX(dsa_switch_drivers_mutex); 28 static LIST_HEAD(dsa_switch_drivers); 29 30 void register_switch_driver(struct dsa_switch_driver *drv) 31 { 32 mutex_lock(&dsa_switch_drivers_mutex); 33 list_add_tail(&drv->list, &dsa_switch_drivers); 34 mutex_unlock(&dsa_switch_drivers_mutex); 35 } 36 EXPORT_SYMBOL_GPL(register_switch_driver); 37 38 void unregister_switch_driver(struct dsa_switch_driver *drv) 39 { 40 mutex_lock(&dsa_switch_drivers_mutex); 41 list_del_init(&drv->list); 42 mutex_unlock(&dsa_switch_drivers_mutex); 43 } 44 EXPORT_SYMBOL_GPL(unregister_switch_driver); 45 46 static struct dsa_switch_driver * 47 dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name) 48 { 49 struct dsa_switch_driver *ret; 50 struct list_head *list; 51 char *name; 52 53 ret = NULL; 54 name = NULL; 55 56 mutex_lock(&dsa_switch_drivers_mutex); 57 list_for_each(list, &dsa_switch_drivers) { 58 struct dsa_switch_driver *drv; 59 60 drv = list_entry(list, struct dsa_switch_driver, list); 61 62 name = drv->probe(bus, sw_addr); 63 if (name != NULL) { 64 ret = drv; 65 break; 66 } 67 } 68 mutex_unlock(&dsa_switch_drivers_mutex); 69 70 *_name = name; 71 72 return ret; 73 } 74 75 76 /* basic switch operations **************************************************/ 77 static struct dsa_switch * 78 dsa_switch_setup(struct dsa_switch_tree *dst, int index, 79 struct device *parent, struct mii_bus *bus) 80 { 81 struct dsa_chip_data *pd = dst->pd->chip + index; 82 struct dsa_switch_driver *drv; 83 struct dsa_switch *ds; 84 int ret; 85 char *name; 86 int i; 87 bool valid_name_found = false; 88 89 /* 90 * Probe for switch model. 91 */ 92 drv = dsa_switch_probe(bus, pd->sw_addr, &name); 93 if (drv == NULL) { 94 printk(KERN_ERR "%s[%d]: could not detect attached switch\n", 95 dst->master_netdev->name, index); 96 return ERR_PTR(-EINVAL); 97 } 98 printk(KERN_INFO "%s[%d]: detected a %s switch\n", 99 dst->master_netdev->name, index, name); 100 101 102 /* 103 * Allocate and initialise switch state. 104 */ 105 ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL); 106 if (ds == NULL) 107 return ERR_PTR(-ENOMEM); 108 109 ds->dst = dst; 110 ds->index = index; 111 ds->pd = dst->pd->chip + index; 112 ds->drv = drv; 113 ds->master_mii_bus = bus; 114 115 116 /* 117 * Validate supplied switch configuration. 118 */ 119 for (i = 0; i < DSA_MAX_PORTS; i++) { 120 char *name; 121 122 name = pd->port_names[i]; 123 if (name == NULL) 124 continue; 125 126 if (!strcmp(name, "cpu")) { 127 if (dst->cpu_switch != -1) { 128 printk(KERN_ERR "multiple cpu ports?!\n"); 129 ret = -EINVAL; 130 goto out; 131 } 132 dst->cpu_switch = index; 133 dst->cpu_port = i; 134 } else if (!strcmp(name, "dsa")) { 135 ds->dsa_port_mask |= 1 << i; 136 } else { 137 ds->phys_port_mask |= 1 << i; 138 } 139 valid_name_found = true; 140 } 141 142 if (!valid_name_found && i == DSA_MAX_PORTS) { 143 ret = -EINVAL; 144 goto out; 145 } 146 147 /* 148 * If the CPU connects to this switch, set the switch tree 149 * tagging protocol to the preferred tagging format of this 150 * switch. 151 */ 152 if (ds->dst->cpu_switch == index) 153 ds->dst->tag_protocol = drv->tag_protocol; 154 155 156 /* 157 * Do basic register setup. 158 */ 159 ret = drv->setup(ds); 160 if (ret < 0) 161 goto out; 162 163 ret = drv->set_addr(ds, dst->master_netdev->dev_addr); 164 if (ret < 0) 165 goto out; 166 167 ds->slave_mii_bus = mdiobus_alloc(); 168 if (ds->slave_mii_bus == NULL) { 169 ret = -ENOMEM; 170 goto out; 171 } 172 dsa_slave_mii_bus_init(ds); 173 174 ret = mdiobus_register(ds->slave_mii_bus); 175 if (ret < 0) 176 goto out_free; 177 178 179 /* 180 * Create network devices for physical switch ports. 181 */ 182 for (i = 0; i < DSA_MAX_PORTS; i++) { 183 struct net_device *slave_dev; 184 185 if (!(ds->phys_port_mask & (1 << i))) 186 continue; 187 188 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]); 189 if (slave_dev == NULL) { 190 printk(KERN_ERR "%s[%d]: can't create dsa " 191 "slave device for port %d(%s)\n", 192 dst->master_netdev->name, 193 index, i, pd->port_names[i]); 194 continue; 195 } 196 197 ds->ports[i] = slave_dev; 198 } 199 200 return ds; 201 202 out_free: 203 mdiobus_free(ds->slave_mii_bus); 204 out: 205 kfree(ds); 206 return ERR_PTR(ret); 207 } 208 209 static void dsa_switch_destroy(struct dsa_switch *ds) 210 { 211 } 212 213 214 /* link polling *************************************************************/ 215 static void dsa_link_poll_work(struct work_struct *ugly) 216 { 217 struct dsa_switch_tree *dst; 218 int i; 219 220 dst = container_of(ugly, struct dsa_switch_tree, link_poll_work); 221 222 for (i = 0; i < dst->pd->nr_chips; i++) { 223 struct dsa_switch *ds = dst->ds[i]; 224 225 if (ds != NULL && ds->drv->poll_link != NULL) 226 ds->drv->poll_link(ds); 227 } 228 229 mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ)); 230 } 231 232 static void dsa_link_poll_timer(unsigned long _dst) 233 { 234 struct dsa_switch_tree *dst = (void *)_dst; 235 236 schedule_work(&dst->link_poll_work); 237 } 238 239 240 /* platform driver init and cleanup *****************************************/ 241 static int dev_is_class(struct device *dev, void *class) 242 { 243 if (dev->class != NULL && !strcmp(dev->class->name, class)) 244 return 1; 245 246 return 0; 247 } 248 249 static struct device *dev_find_class(struct device *parent, char *class) 250 { 251 if (dev_is_class(parent, class)) { 252 get_device(parent); 253 return parent; 254 } 255 256 return device_find_child(parent, class, dev_is_class); 257 } 258 259 static struct mii_bus *dev_to_mii_bus(struct device *dev) 260 { 261 struct device *d; 262 263 d = dev_find_class(dev, "mdio_bus"); 264 if (d != NULL) { 265 struct mii_bus *bus; 266 267 bus = to_mii_bus(d); 268 put_device(d); 269 270 return bus; 271 } 272 273 return NULL; 274 } 275 276 static struct net_device *dev_to_net_device(struct device *dev) 277 { 278 struct device *d; 279 280 d = dev_find_class(dev, "net"); 281 if (d != NULL) { 282 struct net_device *nd; 283 284 nd = to_net_dev(d); 285 dev_hold(nd); 286 put_device(d); 287 288 return nd; 289 } 290 291 return NULL; 292 } 293 294 #ifdef CONFIG_OF 295 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd, 296 struct dsa_chip_data *cd, 297 int chip_index, 298 struct device_node *link) 299 { 300 int ret; 301 const __be32 *reg; 302 int link_port_addr; 303 int link_sw_addr; 304 struct device_node *parent_sw; 305 int len; 306 307 parent_sw = of_get_parent(link); 308 if (!parent_sw) 309 return -EINVAL; 310 311 reg = of_get_property(parent_sw, "reg", &len); 312 if (!reg || (len != sizeof(*reg) * 2)) 313 return -EINVAL; 314 315 link_sw_addr = be32_to_cpup(reg + 1); 316 317 if (link_sw_addr >= pd->nr_chips) 318 return -EINVAL; 319 320 /* First time routing table allocation */ 321 if (!cd->rtable) { 322 cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL); 323 if (!cd->rtable) 324 return -ENOMEM; 325 326 /* default to no valid uplink/downlink */ 327 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8)); 328 } 329 330 reg = of_get_property(link, "reg", NULL); 331 if (!reg) { 332 ret = -EINVAL; 333 goto out; 334 } 335 336 link_port_addr = be32_to_cpup(reg); 337 338 cd->rtable[link_sw_addr] = link_port_addr; 339 340 return 0; 341 out: 342 kfree(cd->rtable); 343 return ret; 344 } 345 346 static void dsa_of_free_platform_data(struct dsa_platform_data *pd) 347 { 348 int i; 349 int port_index; 350 351 for (i = 0; i < pd->nr_chips; i++) { 352 port_index = 0; 353 while (port_index < DSA_MAX_PORTS) { 354 kfree(pd->chip[i].port_names[port_index]); 355 port_index++; 356 } 357 kfree(pd->chip[i].rtable); 358 } 359 kfree(pd->chip); 360 } 361 362 static int dsa_of_probe(struct platform_device *pdev) 363 { 364 struct device_node *np = pdev->dev.of_node; 365 struct device_node *child, *mdio, *ethernet, *port, *link; 366 struct mii_bus *mdio_bus; 367 struct platform_device *ethernet_dev; 368 struct dsa_platform_data *pd; 369 struct dsa_chip_data *cd; 370 const char *port_name; 371 int chip_index, port_index; 372 const unsigned int *sw_addr, *port_reg; 373 int ret; 374 375 mdio = of_parse_phandle(np, "dsa,mii-bus", 0); 376 if (!mdio) 377 return -EINVAL; 378 379 mdio_bus = of_mdio_find_bus(mdio); 380 if (!mdio_bus) 381 return -EINVAL; 382 383 ethernet = of_parse_phandle(np, "dsa,ethernet", 0); 384 if (!ethernet) 385 return -EINVAL; 386 387 ethernet_dev = of_find_device_by_node(ethernet); 388 if (!ethernet_dev) 389 return -ENODEV; 390 391 pd = kzalloc(sizeof(*pd), GFP_KERNEL); 392 if (!pd) 393 return -ENOMEM; 394 395 pdev->dev.platform_data = pd; 396 pd->netdev = ðernet_dev->dev; 397 pd->nr_chips = of_get_child_count(np); 398 if (pd->nr_chips > DSA_MAX_SWITCHES) 399 pd->nr_chips = DSA_MAX_SWITCHES; 400 401 pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data), 402 GFP_KERNEL); 403 if (!pd->chip) { 404 ret = -ENOMEM; 405 goto out_free; 406 } 407 408 chip_index = -1; 409 for_each_available_child_of_node(np, child) { 410 chip_index++; 411 cd = &pd->chip[chip_index]; 412 413 cd->mii_bus = &mdio_bus->dev; 414 415 sw_addr = of_get_property(child, "reg", NULL); 416 if (!sw_addr) 417 continue; 418 419 cd->sw_addr = be32_to_cpup(sw_addr); 420 if (cd->sw_addr > PHY_MAX_ADDR) 421 continue; 422 423 for_each_available_child_of_node(child, port) { 424 port_reg = of_get_property(port, "reg", NULL); 425 if (!port_reg) 426 continue; 427 428 port_index = be32_to_cpup(port_reg); 429 430 port_name = of_get_property(port, "label", NULL); 431 if (!port_name) 432 continue; 433 434 cd->port_names[port_index] = kstrdup(port_name, 435 GFP_KERNEL); 436 if (!cd->port_names[port_index]) { 437 ret = -ENOMEM; 438 goto out_free_chip; 439 } 440 441 link = of_parse_phandle(port, "link", 0); 442 443 if (!strcmp(port_name, "dsa") && link && 444 pd->nr_chips > 1) { 445 ret = dsa_of_setup_routing_table(pd, cd, 446 chip_index, link); 447 if (ret) 448 goto out_free_chip; 449 } 450 451 if (port_index == DSA_MAX_PORTS) 452 break; 453 } 454 } 455 456 return 0; 457 458 out_free_chip: 459 dsa_of_free_platform_data(pd); 460 out_free: 461 kfree(pd); 462 pdev->dev.platform_data = NULL; 463 return ret; 464 } 465 466 static void dsa_of_remove(struct platform_device *pdev) 467 { 468 struct dsa_platform_data *pd = pdev->dev.platform_data; 469 470 if (!pdev->dev.of_node) 471 return; 472 473 dsa_of_free_platform_data(pd); 474 kfree(pd); 475 } 476 #else 477 static inline int dsa_of_probe(struct platform_device *pdev) 478 { 479 return 0; 480 } 481 482 static inline void dsa_of_remove(struct platform_device *pdev) 483 { 484 } 485 #endif 486 487 static int dsa_probe(struct platform_device *pdev) 488 { 489 static int dsa_version_printed; 490 struct dsa_platform_data *pd = pdev->dev.platform_data; 491 struct net_device *dev; 492 struct dsa_switch_tree *dst; 493 int i, ret; 494 495 if (!dsa_version_printed++) 496 printk(KERN_NOTICE "Distributed Switch Architecture " 497 "driver version %s\n", dsa_driver_version); 498 499 if (pdev->dev.of_node) { 500 ret = dsa_of_probe(pdev); 501 if (ret) 502 return ret; 503 504 pd = pdev->dev.platform_data; 505 } 506 507 if (pd == NULL || pd->netdev == NULL) 508 return -EINVAL; 509 510 dev = dev_to_net_device(pd->netdev); 511 if (dev == NULL) { 512 ret = -EINVAL; 513 goto out; 514 } 515 516 if (dev->dsa_ptr != NULL) { 517 dev_put(dev); 518 ret = -EEXIST; 519 goto out; 520 } 521 522 dst = kzalloc(sizeof(*dst), GFP_KERNEL); 523 if (dst == NULL) { 524 dev_put(dev); 525 ret = -ENOMEM; 526 goto out; 527 } 528 529 platform_set_drvdata(pdev, dst); 530 531 dst->pd = pd; 532 dst->master_netdev = dev; 533 dst->cpu_switch = -1; 534 dst->cpu_port = -1; 535 536 for (i = 0; i < pd->nr_chips; i++) { 537 struct mii_bus *bus; 538 struct dsa_switch *ds; 539 540 bus = dev_to_mii_bus(pd->chip[i].mii_bus); 541 if (bus == NULL) { 542 printk(KERN_ERR "%s[%d]: no mii bus found for " 543 "dsa switch\n", dev->name, i); 544 continue; 545 } 546 547 ds = dsa_switch_setup(dst, i, &pdev->dev, bus); 548 if (IS_ERR(ds)) { 549 printk(KERN_ERR "%s[%d]: couldn't create dsa switch " 550 "instance (error %ld)\n", dev->name, i, 551 PTR_ERR(ds)); 552 continue; 553 } 554 555 dst->ds[i] = ds; 556 if (ds->drv->poll_link != NULL) 557 dst->link_poll_needed = 1; 558 } 559 560 /* 561 * If we use a tagging format that doesn't have an ethertype 562 * field, make sure that all packets from this point on get 563 * sent to the tag format's receive function. 564 */ 565 wmb(); 566 dev->dsa_ptr = (void *)dst; 567 568 if (dst->link_poll_needed) { 569 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work); 570 init_timer(&dst->link_poll_timer); 571 dst->link_poll_timer.data = (unsigned long)dst; 572 dst->link_poll_timer.function = dsa_link_poll_timer; 573 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ); 574 add_timer(&dst->link_poll_timer); 575 } 576 577 return 0; 578 579 out: 580 dsa_of_remove(pdev); 581 582 return ret; 583 } 584 585 static int dsa_remove(struct platform_device *pdev) 586 { 587 struct dsa_switch_tree *dst = platform_get_drvdata(pdev); 588 int i; 589 590 if (dst->link_poll_needed) 591 del_timer_sync(&dst->link_poll_timer); 592 593 flush_work(&dst->link_poll_work); 594 595 for (i = 0; i < dst->pd->nr_chips; i++) { 596 struct dsa_switch *ds = dst->ds[i]; 597 598 if (ds != NULL) 599 dsa_switch_destroy(ds); 600 } 601 602 dsa_of_remove(pdev); 603 604 return 0; 605 } 606 607 static void dsa_shutdown(struct platform_device *pdev) 608 { 609 } 610 611 static const struct of_device_id dsa_of_match_table[] = { 612 { .compatible = "marvell,dsa", }, 613 {} 614 }; 615 MODULE_DEVICE_TABLE(of, dsa_of_match_table); 616 617 static struct platform_driver dsa_driver = { 618 .probe = dsa_probe, 619 .remove = dsa_remove, 620 .shutdown = dsa_shutdown, 621 .driver = { 622 .name = "dsa", 623 .owner = THIS_MODULE, 624 .of_match_table = dsa_of_match_table, 625 }, 626 }; 627 628 static int __init dsa_init_module(void) 629 { 630 int rc; 631 632 rc = platform_driver_register(&dsa_driver); 633 if (rc) 634 return rc; 635 636 #ifdef CONFIG_NET_DSA_TAG_DSA 637 dev_add_pack(&dsa_packet_type); 638 #endif 639 #ifdef CONFIG_NET_DSA_TAG_EDSA 640 dev_add_pack(&edsa_packet_type); 641 #endif 642 #ifdef CONFIG_NET_DSA_TAG_TRAILER 643 dev_add_pack(&trailer_packet_type); 644 #endif 645 return 0; 646 } 647 module_init(dsa_init_module); 648 649 static void __exit dsa_cleanup_module(void) 650 { 651 #ifdef CONFIG_NET_DSA_TAG_TRAILER 652 dev_remove_pack(&trailer_packet_type); 653 #endif 654 #ifdef CONFIG_NET_DSA_TAG_EDSA 655 dev_remove_pack(&edsa_packet_type); 656 #endif 657 #ifdef CONFIG_NET_DSA_TAG_DSA 658 dev_remove_pack(&dsa_packet_type); 659 #endif 660 platform_driver_unregister(&dsa_driver); 661 } 662 module_exit(dsa_cleanup_module); 663 664 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>"); 665 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips"); 666 MODULE_LICENSE("GPL"); 667 MODULE_ALIAS("platform:dsa"); 668