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1/*
2 * net/dsa/dsa.c - Hardware switch handling
3 * Copyright (c) 2008-2009 Marvell Semiconductor
4 *
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>
14#include <linux/slab.h>
15#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 *
71dsa_switch_setup(struct dsa_switch_tree *dst, int index,
72 struct device *parent, struct mii_bus *bus)
73{
74 struct dsa_chip_data *pd = dst->pd->chip + index;
75 struct dsa_switch_driver *drv;
76 struct dsa_switch *ds;
77 int ret;
78 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) {
86 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
87 dst->master_netdev->name, index);
88 return ERR_PTR(-EINVAL);
89 }
90 printk(KERN_INFO "%s[%d]: detected a %s switch\n",
91 dst->master_netdev->name, index, name);
92
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
101 ds->dst = dst;
102 ds->index = index;
103 ds->pd = dst->pd->chip + index;
104 ds->drv = drv;
105 ds->master_mii_bus = bus;
106
107
108 /*
109 * Validate supplied switch configuration.
110 */
111 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")) {
119 if (dst->cpu_switch != -1) {
120 printk(KERN_ERR "multiple cpu ports?!\n");
121 ret = -EINVAL;
122 goto out;
123 }
124 dst->cpu_switch = index;
125 dst->cpu_port = i;
126 } else if (!strcmp(name, "dsa")) {
127 ds->dsa_port_mask |= 1 << i;
128 } else {
129 ds->phys_port_mask |= 1 << i;
130 }
131 }
132
133
134 /*
135 * If the CPU connects to this switch, set the switch tree
136 * tagging protocol to the preferred tagging format of this
137 * switch.
138 */
139 if (ds->dst->cpu_switch == index)
140 ds->dst->tag_protocol = drv->tag_protocol;
141
142
143 /*
144 * Do basic register setup.
145 */
146 ret = drv->setup(ds);
147 if (ret < 0)
148 goto out;
149
150 ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
151 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 */
169 for (i = 0; i < DSA_MAX_PORTS; i++) {
170 struct net_device *slave_dev;
171
172 if (!(ds->phys_port_mask & (1 << i)))
173 continue;
174
175 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
176 if (slave_dev == NULL) {
177 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]);
181 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:
192 kfree(ds);
193 return ERR_PTR(ret);
194}
195
196static void dsa_switch_destroy(struct dsa_switch *ds)
197{
198}
199
200
201/* 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{
211 struct dsa_switch_tree *dst = dsa_ptr;
212
213 return !!(dst->tag_protocol == htons(ETH_P_DSA));
214}
215
216bool dsa_uses_trailer_tags(void *dsa_ptr)
217{
218 struct dsa_switch_tree *dst = dsa_ptr;
219
220 return !!(dst->tag_protocol == htons(ETH_P_TRAILER));
221}
222
223
224/* link polling *************************************************************/
225static void dsa_link_poll_work(struct work_struct *ugly)
226{
227 struct dsa_switch_tree *dst;
228 int i;
229
230 dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
231
232 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));
240}
241
242static void dsa_link_poll_timer(unsigned long _dst)
243{
244 struct dsa_switch_tree *dst = (void *)_dst;
245
246 schedule_work(&dst->link_poll_work);
247}
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;
309 struct dsa_switch_tree *dst;
310 int i;
311
312 if (!dsa_version_printed++)
313 printk(KERN_NOTICE "Distributed Switch Architecture "
314 "driver version %s\n", dsa_driver_version);
315
316 if (pd == NULL || pd->netdev == NULL)
317 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
328 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
329 if (dst == NULL) {
330 dev_put(dev);
331 return -ENOMEM;
332 }
333
334 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;
363 }
364
365 /*
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 }
381
382 return 0;
383}
384
385static int dsa_remove(struct platform_device *pdev)
386{
387 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
388 int i;
389
390 if (dst->link_poll_needed)
391 del_timer_sync(&dst->link_poll_timer);
392
393 flush_work_sync(&dst->link_poll_work);
394
395 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 }
401
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
431MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
432MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
433MODULE_LICENSE("GPL");
434MODULE_ALIAS("platform:dsa");
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
23char dsa_driver_version[] = "0.1";
24
25
26/* switch driver registration ***********************************************/
27static DEFINE_MUTEX(dsa_switch_drivers_mutex);
28static LIST_HEAD(dsa_switch_drivers);
29
30void 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}
36EXPORT_SYMBOL_GPL(register_switch_driver);
37
38void 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}
44EXPORT_SYMBOL_GPL(unregister_switch_driver);
45
46static struct dsa_switch_driver *
47dsa_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 **************************************************/
77static struct dsa_switch *
78dsa_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
202out_free:
203 mdiobus_free(ds->slave_mii_bus);
204out:
205 kfree(ds);
206 return ERR_PTR(ret);
207}
208
209static void dsa_switch_destroy(struct dsa_switch *ds)
210{
211}
212
213
214/* link polling *************************************************************/
215static 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
232static 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 *****************************************/
241static 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
249static 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
259static 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
276static 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
295static 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;
341out:
342 kfree(cd->rtable);
343 return ret;
344}
345
346static 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 if (pd->chip[i].port_names[port_index])
355 kfree(pd->chip[i].port_names[port_index]);
356 port_index++;
357 }
358 kfree(pd->chip[i].rtable);
359 }
360 kfree(pd->chip);
361}
362
363static int dsa_of_probe(struct platform_device *pdev)
364{
365 struct device_node *np = pdev->dev.of_node;
366 struct device_node *child, *mdio, *ethernet, *port, *link;
367 struct mii_bus *mdio_bus;
368 struct platform_device *ethernet_dev;
369 struct dsa_platform_data *pd;
370 struct dsa_chip_data *cd;
371 const char *port_name;
372 int chip_index, port_index;
373 const unsigned int *sw_addr, *port_reg;
374 int ret;
375
376 mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
377 if (!mdio)
378 return -EINVAL;
379
380 mdio_bus = of_mdio_find_bus(mdio);
381 if (!mdio_bus)
382 return -EINVAL;
383
384 ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
385 if (!ethernet)
386 return -EINVAL;
387
388 ethernet_dev = of_find_device_by_node(ethernet);
389 if (!ethernet_dev)
390 return -ENODEV;
391
392 pd = kzalloc(sizeof(*pd), GFP_KERNEL);
393 if (!pd)
394 return -ENOMEM;
395
396 pdev->dev.platform_data = pd;
397 pd->netdev = ðernet_dev->dev;
398 pd->nr_chips = of_get_child_count(np);
399 if (pd->nr_chips > DSA_MAX_SWITCHES)
400 pd->nr_chips = DSA_MAX_SWITCHES;
401
402 pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data),
403 GFP_KERNEL);
404 if (!pd->chip) {
405 ret = -ENOMEM;
406 goto out_free;
407 }
408
409 chip_index = -1;
410 for_each_available_child_of_node(np, child) {
411 chip_index++;
412 cd = &pd->chip[chip_index];
413
414 cd->mii_bus = &mdio_bus->dev;
415
416 sw_addr = of_get_property(child, "reg", NULL);
417 if (!sw_addr)
418 continue;
419
420 cd->sw_addr = be32_to_cpup(sw_addr);
421 if (cd->sw_addr > PHY_MAX_ADDR)
422 continue;
423
424 for_each_available_child_of_node(child, port) {
425 port_reg = of_get_property(port, "reg", NULL);
426 if (!port_reg)
427 continue;
428
429 port_index = be32_to_cpup(port_reg);
430
431 port_name = of_get_property(port, "label", NULL);
432 if (!port_name)
433 continue;
434
435 cd->port_names[port_index] = kstrdup(port_name,
436 GFP_KERNEL);
437 if (!cd->port_names[port_index]) {
438 ret = -ENOMEM;
439 goto out_free_chip;
440 }
441
442 link = of_parse_phandle(port, "link", 0);
443
444 if (!strcmp(port_name, "dsa") && link &&
445 pd->nr_chips > 1) {
446 ret = dsa_of_setup_routing_table(pd, cd,
447 chip_index, link);
448 if (ret)
449 goto out_free_chip;
450 }
451
452 if (port_index == DSA_MAX_PORTS)
453 break;
454 }
455 }
456
457 return 0;
458
459out_free_chip:
460 dsa_of_free_platform_data(pd);
461out_free:
462 kfree(pd);
463 pdev->dev.platform_data = NULL;
464 return ret;
465}
466
467static void dsa_of_remove(struct platform_device *pdev)
468{
469 struct dsa_platform_data *pd = pdev->dev.platform_data;
470
471 if (!pdev->dev.of_node)
472 return;
473
474 dsa_of_free_platform_data(pd);
475 kfree(pd);
476}
477#else
478static inline int dsa_of_probe(struct platform_device *pdev)
479{
480 return 0;
481}
482
483static inline void dsa_of_remove(struct platform_device *pdev)
484{
485}
486#endif
487
488static int dsa_probe(struct platform_device *pdev)
489{
490 static int dsa_version_printed;
491 struct dsa_platform_data *pd = pdev->dev.platform_data;
492 struct net_device *dev;
493 struct dsa_switch_tree *dst;
494 int i, ret;
495
496 if (!dsa_version_printed++)
497 printk(KERN_NOTICE "Distributed Switch Architecture "
498 "driver version %s\n", dsa_driver_version);
499
500 if (pdev->dev.of_node) {
501 ret = dsa_of_probe(pdev);
502 if (ret)
503 return ret;
504
505 pd = pdev->dev.platform_data;
506 }
507
508 if (pd == NULL || pd->netdev == NULL)
509 return -EINVAL;
510
511 dev = dev_to_net_device(pd->netdev);
512 if (dev == NULL) {
513 ret = -EINVAL;
514 goto out;
515 }
516
517 if (dev->dsa_ptr != NULL) {
518 dev_put(dev);
519 ret = -EEXIST;
520 goto out;
521 }
522
523 dst = kzalloc(sizeof(*dst), GFP_KERNEL);
524 if (dst == NULL) {
525 dev_put(dev);
526 ret = -ENOMEM;
527 goto out;
528 }
529
530 platform_set_drvdata(pdev, dst);
531
532 dst->pd = pd;
533 dst->master_netdev = dev;
534 dst->cpu_switch = -1;
535 dst->cpu_port = -1;
536
537 for (i = 0; i < pd->nr_chips; i++) {
538 struct mii_bus *bus;
539 struct dsa_switch *ds;
540
541 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
542 if (bus == NULL) {
543 printk(KERN_ERR "%s[%d]: no mii bus found for "
544 "dsa switch\n", dev->name, i);
545 continue;
546 }
547
548 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
549 if (IS_ERR(ds)) {
550 printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
551 "instance (error %ld)\n", dev->name, i,
552 PTR_ERR(ds));
553 continue;
554 }
555
556 dst->ds[i] = ds;
557 if (ds->drv->poll_link != NULL)
558 dst->link_poll_needed = 1;
559 }
560
561 /*
562 * If we use a tagging format that doesn't have an ethertype
563 * field, make sure that all packets from this point on get
564 * sent to the tag format's receive function.
565 */
566 wmb();
567 dev->dsa_ptr = (void *)dst;
568
569 if (dst->link_poll_needed) {
570 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
571 init_timer(&dst->link_poll_timer);
572 dst->link_poll_timer.data = (unsigned long)dst;
573 dst->link_poll_timer.function = dsa_link_poll_timer;
574 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
575 add_timer(&dst->link_poll_timer);
576 }
577
578 return 0;
579
580out:
581 dsa_of_remove(pdev);
582
583 return ret;
584}
585
586static int dsa_remove(struct platform_device *pdev)
587{
588 struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
589 int i;
590
591 if (dst->link_poll_needed)
592 del_timer_sync(&dst->link_poll_timer);
593
594 flush_work(&dst->link_poll_work);
595
596 for (i = 0; i < dst->pd->nr_chips; i++) {
597 struct dsa_switch *ds = dst->ds[i];
598
599 if (ds != NULL)
600 dsa_switch_destroy(ds);
601 }
602
603 dsa_of_remove(pdev);
604
605 return 0;
606}
607
608static void dsa_shutdown(struct platform_device *pdev)
609{
610}
611
612static const struct of_device_id dsa_of_match_table[] = {
613 { .compatible = "marvell,dsa", },
614 {}
615};
616MODULE_DEVICE_TABLE(of, dsa_of_match_table);
617
618static struct platform_driver dsa_driver = {
619 .probe = dsa_probe,
620 .remove = dsa_remove,
621 .shutdown = dsa_shutdown,
622 .driver = {
623 .name = "dsa",
624 .owner = THIS_MODULE,
625 .of_match_table = dsa_of_match_table,
626 },
627};
628
629static int __init dsa_init_module(void)
630{
631 int rc;
632
633 rc = platform_driver_register(&dsa_driver);
634 if (rc)
635 return rc;
636
637#ifdef CONFIG_NET_DSA_TAG_DSA
638 dev_add_pack(&dsa_packet_type);
639#endif
640#ifdef CONFIG_NET_DSA_TAG_EDSA
641 dev_add_pack(&edsa_packet_type);
642#endif
643#ifdef CONFIG_NET_DSA_TAG_TRAILER
644 dev_add_pack(&trailer_packet_type);
645#endif
646 return 0;
647}
648module_init(dsa_init_module);
649
650static void __exit dsa_cleanup_module(void)
651{
652#ifdef CONFIG_NET_DSA_TAG_TRAILER
653 dev_remove_pack(&trailer_packet_type);
654#endif
655#ifdef CONFIG_NET_DSA_TAG_EDSA
656 dev_remove_pack(&edsa_packet_type);
657#endif
658#ifdef CONFIG_NET_DSA_TAG_DSA
659 dev_remove_pack(&dsa_packet_type);
660#endif
661 platform_driver_unregister(&dsa_driver);
662}
663module_exit(dsa_cleanup_module);
664
665MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
666MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
667MODULE_LICENSE("GPL");
668MODULE_ALIAS("platform:dsa");