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Lennert Buytenhek91da11f2008-10-07 13:44:02 +00001/*
2 * net/dsa/dsa.c - Hardware switch handling
Lennert Buytenheke84665c2009-03-20 09:52:09 +00003 * Copyright (c) 2008-2009 Marvell Semiconductor
Lennert Buytenhek91da11f2008-10-07 13:44:02 +00004 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 */
10
11#include <linux/list.h>
12#include <linux/netdevice.h>
13#include <linux/platform_device.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Lennert Buytenhek91da11f2008-10-07 13:44:02 +000015#include <net/dsa.h>
16#include "dsa_priv.h"
17
18char dsa_driver_version[] = "0.1";
19
20
21/* switch driver registration ***********************************************/
22static DEFINE_MUTEX(dsa_switch_drivers_mutex);
23static LIST_HEAD(dsa_switch_drivers);
24
25void register_switch_driver(struct dsa_switch_driver *drv)
26{
27 mutex_lock(&dsa_switch_drivers_mutex);
28 list_add_tail(&drv->list, &dsa_switch_drivers);
29 mutex_unlock(&dsa_switch_drivers_mutex);
30}
31
32void unregister_switch_driver(struct dsa_switch_driver *drv)
33{
34 mutex_lock(&dsa_switch_drivers_mutex);
35 list_del_init(&drv->list);
36 mutex_unlock(&dsa_switch_drivers_mutex);
37}
38
39static struct dsa_switch_driver *
40dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
41{
42 struct dsa_switch_driver *ret;
43 struct list_head *list;
44 char *name;
45
46 ret = NULL;
47 name = NULL;
48
49 mutex_lock(&dsa_switch_drivers_mutex);
50 list_for_each(list, &dsa_switch_drivers) {
51 struct dsa_switch_driver *drv;
52
53 drv = list_entry(list, struct dsa_switch_driver, list);
54
55 name = drv->probe(bus, sw_addr);
56 if (name != NULL) {
57 ret = drv;
58 break;
59 }
60 }
61 mutex_unlock(&dsa_switch_drivers_mutex);
62
63 *_name = name;
64
65 return ret;
66}
67
68
69/* basic switch operations **************************************************/
70static struct dsa_switch *
Lennert Buytenheke84665c2009-03-20 09:52:09 +000071dsa_switch_setup(struct dsa_switch_tree *dst, int index,
72 struct device *parent, struct mii_bus *bus)
Lennert Buytenhek91da11f2008-10-07 13:44:02 +000073{
Lennert Buytenheke84665c2009-03-20 09:52:09 +000074 struct dsa_chip_data *pd = dst->pd->chip + index;
75 struct dsa_switch_driver *drv;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +000076 struct dsa_switch *ds;
77 int ret;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +000078 char *name;
79 int i;
80
81 /*
82 * Probe for switch model.
83 */
84 drv = dsa_switch_probe(bus, pd->sw_addr, &name);
85 if (drv == NULL) {
Lennert Buytenheke84665c2009-03-20 09:52:09 +000086 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
87 dst->master_netdev->name, index);
Lennert Buytenhek91da11f2008-10-07 13:44:02 +000088 return ERR_PTR(-EINVAL);
89 }
Lennert Buytenheke84665c2009-03-20 09:52:09 +000090 printk(KERN_INFO "%s[%d]: detected a %s switch\n",
91 dst->master_netdev->name, index, name);
Lennert Buytenhek91da11f2008-10-07 13:44:02 +000092
93
94 /*
95 * Allocate and initialise switch state.
96 */
97 ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
98 if (ds == NULL)
99 return ERR_PTR(-ENOMEM);
100
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000101 ds->dst = dst;
102 ds->index = index;
103 ds->pd = dst->pd->chip + index;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000104 ds->drv = drv;
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000105 ds->master_mii_bus = bus;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000106
107
108 /*
109 * Validate supplied switch configuration.
110 */
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000111 for (i = 0; i < DSA_MAX_PORTS; i++) {
112 char *name;
113
114 name = pd->port_names[i];
115 if (name == NULL)
116 continue;
117
118 if (!strcmp(name, "cpu")) {
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000119 if (dst->cpu_switch != -1) {
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000120 printk(KERN_ERR "multiple cpu ports?!\n");
121 ret = -EINVAL;
122 goto out;
123 }
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000124 dst->cpu_switch = index;
125 dst->cpu_port = i;
126 } else if (!strcmp(name, "dsa")) {
127 ds->dsa_port_mask |= 1 << i;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000128 } else {
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000129 ds->phys_port_mask |= 1 << i;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000130 }
131 }
132
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000133
134 /*
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000135 * If the CPU connects to this switch, set the switch tree
136 * tagging protocol to the preferred tagging format of this
137 * switch.
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000138 */
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000139 if (ds->dst->cpu_switch == index)
140 ds->dst->tag_protocol = drv->tag_protocol;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000141
142
143 /*
144 * Do basic register setup.
145 */
146 ret = drv->setup(ds);
147 if (ret < 0)
148 goto out;
149
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000150 ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000151 if (ret < 0)
152 goto out;
153
154 ds->slave_mii_bus = mdiobus_alloc();
155 if (ds->slave_mii_bus == NULL) {
156 ret = -ENOMEM;
157 goto out;
158 }
159 dsa_slave_mii_bus_init(ds);
160
161 ret = mdiobus_register(ds->slave_mii_bus);
162 if (ret < 0)
163 goto out_free;
164
165
166 /*
167 * Create network devices for physical switch ports.
168 */
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000169 for (i = 0; i < DSA_MAX_PORTS; i++) {
170 struct net_device *slave_dev;
171
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000172 if (!(ds->phys_port_mask & (1 << i)))
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000173 continue;
174
175 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
176 if (slave_dev == NULL) {
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000177 printk(KERN_ERR "%s[%d]: can't create dsa "
178 "slave device for port %d(%s)\n",
179 dst->master_netdev->name,
180 index, i, pd->port_names[i]);
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000181 continue;
182 }
183
184 ds->ports[i] = slave_dev;
185 }
186
187 return ds;
188
189out_free:
190 mdiobus_free(ds->slave_mii_bus);
191out:
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000192 kfree(ds);
193 return ERR_PTR(ret);
194}
195
196static void dsa_switch_destroy(struct dsa_switch *ds)
197{
198}
199
200
Lennert Buytenhekcf85d082008-10-07 13:45:02 +0000201/* hooks for ethertype-less tagging formats *********************************/
202/*
203 * The original DSA tag format and some other tag formats have no
204 * ethertype, which means that we need to add a little hack to the
205 * networking receive path to make sure that received frames get
206 * the right ->protocol assigned to them when one of those tag
207 * formats is in use.
208 */
209bool dsa_uses_dsa_tags(void *dsa_ptr)
210{
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000211 struct dsa_switch_tree *dst = dsa_ptr;
Lennert Buytenhekcf85d082008-10-07 13:45:02 +0000212
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000213 return !!(dst->tag_protocol == htons(ETH_P_DSA));
Lennert Buytenhekcf85d082008-10-07 13:45:02 +0000214}
215
Lennert Buytenhek396138f2008-10-07 13:46:07 +0000216bool dsa_uses_trailer_tags(void *dsa_ptr)
217{
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000218 struct dsa_switch_tree *dst = dsa_ptr;
Lennert Buytenhek396138f2008-10-07 13:46:07 +0000219
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000220 return !!(dst->tag_protocol == htons(ETH_P_TRAILER));
Lennert Buytenhek396138f2008-10-07 13:46:07 +0000221}
222
Lennert Buytenhekcf85d082008-10-07 13:45:02 +0000223
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000224/* link polling *************************************************************/
225static void dsa_link_poll_work(struct work_struct *ugly)
226{
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000227 struct dsa_switch_tree *dst;
228 int i;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000229
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000230 dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000231
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000232 for (i = 0; i < dst->pd->nr_chips; i++) {
233 struct dsa_switch *ds = dst->ds[i];
234
235 if (ds != NULL && ds->drv->poll_link != NULL)
236 ds->drv->poll_link(ds);
237 }
238
239 mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000240}
241
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000242static void dsa_link_poll_timer(unsigned long _dst)
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000243{
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000244 struct dsa_switch_tree *dst = (void *)_dst;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000245
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000246 schedule_work(&dst->link_poll_work);
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000247}
248
249
250/* platform driver init and cleanup *****************************************/
251static int dev_is_class(struct device *dev, void *class)
252{
253 if (dev->class != NULL && !strcmp(dev->class->name, class))
254 return 1;
255
256 return 0;
257}
258
259static struct device *dev_find_class(struct device *parent, char *class)
260{
261 if (dev_is_class(parent, class)) {
262 get_device(parent);
263 return parent;
264 }
265
266 return device_find_child(parent, class, dev_is_class);
267}
268
269static struct mii_bus *dev_to_mii_bus(struct device *dev)
270{
271 struct device *d;
272
273 d = dev_find_class(dev, "mdio_bus");
274 if (d != NULL) {
275 struct mii_bus *bus;
276
277 bus = to_mii_bus(d);
278 put_device(d);
279
280 return bus;
281 }
282
283 return NULL;
284}
285
286static struct net_device *dev_to_net_device(struct device *dev)
287{
288 struct device *d;
289
290 d = dev_find_class(dev, "net");
291 if (d != NULL) {
292 struct net_device *nd;
293
294 nd = to_net_dev(d);
295 dev_hold(nd);
296 put_device(d);
297
298 return nd;
299 }
300
301 return NULL;
302}
303
304static int dsa_probe(struct platform_device *pdev)
305{
306 static int dsa_version_printed;
307 struct dsa_platform_data *pd = pdev->dev.platform_data;
308 struct net_device *dev;
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000309 struct dsa_switch_tree *dst;
310 int i;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000311
312 if (!dsa_version_printed++)
313 printk(KERN_NOTICE "Distributed Switch Architecture "
314 "driver version %s\n", dsa_driver_version);
315
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000316 if (pd == NULL || pd->netdev == NULL)
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000317 return -EINVAL;
318
319 dev = dev_to_net_device(pd->netdev);
320 if (dev == NULL)
321 return -EINVAL;
322
323 if (dev->dsa_ptr != NULL) {
324 dev_put(dev);
325 return -EEXIST;
326 }
327
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000328 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
329 if (dst == NULL) {
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000330 dev_put(dev);
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000331 return -ENOMEM;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000332 }
333
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000334 platform_set_drvdata(pdev, dst);
335
336 dst->pd = pd;
337 dst->master_netdev = dev;
338 dst->cpu_switch = -1;
339 dst->cpu_port = -1;
340
341 for (i = 0; i < pd->nr_chips; i++) {
342 struct mii_bus *bus;
343 struct dsa_switch *ds;
344
345 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
346 if (bus == NULL) {
347 printk(KERN_ERR "%s[%d]: no mii bus found for "
348 "dsa switch\n", dev->name, i);
349 continue;
350 }
351
352 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
353 if (IS_ERR(ds)) {
354 printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
355 "instance (error %ld)\n", dev->name, i,
356 PTR_ERR(ds));
357 continue;
358 }
359
360 dst->ds[i] = ds;
361 if (ds->drv->poll_link != NULL)
362 dst->link_poll_needed = 1;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000363 }
364
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000365 /*
366 * If we use a tagging format that doesn't have an ethertype
367 * field, make sure that all packets from this point on get
368 * sent to the tag format's receive function.
369 */
370 wmb();
371 dev->dsa_ptr = (void *)dst;
372
373 if (dst->link_poll_needed) {
374 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
375 init_timer(&dst->link_poll_timer);
376 dst->link_poll_timer.data = (unsigned long)dst;
377 dst->link_poll_timer.function = dsa_link_poll_timer;
378 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
379 add_timer(&dst->link_poll_timer);
380 }
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000381
382 return 0;
383}
384
385static int dsa_remove(struct platform_device *pdev)
386{
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000387 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
388 int i;
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000389
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000390 if (dst->link_poll_needed)
391 del_timer_sync(&dst->link_poll_timer);
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000392
Tejun Heo7f6b0db2010-12-24 15:59:06 +0100393 flush_work_sync(&dst->link_poll_work);
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000394
Lennert Buytenheke84665c2009-03-20 09:52:09 +0000395 for (i = 0; i < dst->pd->nr_chips; i++) {
396 struct dsa_switch *ds = dst->ds[i];
397
398 if (ds != NULL)
399 dsa_switch_destroy(ds);
400 }
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000401
402 return 0;
403}
404
405static void dsa_shutdown(struct platform_device *pdev)
406{
407}
408
409static struct platform_driver dsa_driver = {
410 .probe = dsa_probe,
411 .remove = dsa_remove,
412 .shutdown = dsa_shutdown,
413 .driver = {
414 .name = "dsa",
415 .owner = THIS_MODULE,
416 },
417};
418
419static int __init dsa_init_module(void)
420{
421 return platform_driver_register(&dsa_driver);
422}
423module_init(dsa_init_module);
424
425static void __exit dsa_cleanup_module(void)
426{
427 platform_driver_unregister(&dsa_driver);
428}
429module_exit(dsa_cleanup_module);
430
Rusty Russell577d6a72011-01-24 14:32:52 -0600431MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
Lennert Buytenhek91da11f2008-10-07 13:44:02 +0000432MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
433MODULE_LICENSE("GPL");
434MODULE_ALIAS("platform:dsa");