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12#include <linux/kernel.h>
13#include <linux/device.h>
14#include <linux/netdevice.h>
15#include <linux/err.h>
16#include <linux/phy.h>
17#include <linux/phy_fixed.h>
18#include <linux/of.h>
19#include <linux/of_gpio.h>
20#include <linux/of_irq.h>
21#include <linux/of_mdio.h>
22#include <linux/of_net.h>
23#include <linux/module.h>
24
25#define DEFAULT_GPIO_RESET_DELAY 10
26
27MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
28MODULE_LICENSE("GPL");
29
30
31
32static int of_get_phy_id(struct device_node *device, u32 *phy_id)
33{
34 struct property *prop;
35 const char *cp;
36 unsigned int upper, lower;
37
38 of_property_for_each_string(device, "compatible", prop, cp) {
39 if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
40 *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
41 return 0;
42 }
43 }
44 return -EINVAL;
45}
46
47static int of_mdiobus_register_phy(struct mii_bus *mdio,
48 struct device_node *child, u32 addr)
49{
50 struct phy_device *phy;
51 bool is_c45;
52 int rc;
53 u32 phy_id;
54
55 is_c45 = of_device_is_compatible(child,
56 "ethernet-phy-ieee802.3-c45");
57
58 if (!is_c45 && !of_get_phy_id(child, &phy_id))
59 phy = phy_device_create(mdio, addr, phy_id, 0, NULL);
60 else
61 phy = get_phy_device(mdio, addr, is_c45);
62 if (IS_ERR(phy))
63 return PTR_ERR(phy);
64
65 rc = of_irq_get(child, 0);
66 if (rc == -EPROBE_DEFER) {
67 phy_device_free(phy);
68 return rc;
69 }
70 if (rc > 0) {
71 phy->irq = rc;
72 mdio->irq[addr] = rc;
73 } else {
74 phy->irq = mdio->irq[addr];
75 }
76
77 if (of_property_read_bool(child, "broken-turn-around"))
78 mdio->phy_ignore_ta_mask |= 1 << addr;
79
80
81
82 of_node_get(child);
83 phy->mdio.dev.of_node = child;
84 phy->mdio.dev.fwnode = of_fwnode_handle(child);
85
86
87
88 rc = phy_device_register(phy);
89 if (rc) {
90 phy_device_free(phy);
91 of_node_put(child);
92 return rc;
93 }
94
95 dev_dbg(&mdio->dev, "registered phy %s at address %i\n",
96 child->name, addr);
97 return 0;
98}
99
100static int of_mdiobus_register_device(struct mii_bus *mdio,
101 struct device_node *child, u32 addr)
102{
103 struct mdio_device *mdiodev;
104 int rc;
105
106 mdiodev = mdio_device_create(mdio, addr);
107 if (IS_ERR(mdiodev))
108 return PTR_ERR(mdiodev);
109
110
111
112
113 of_node_get(child);
114 mdiodev->dev.of_node = child;
115 mdiodev->dev.fwnode = of_fwnode_handle(child);
116
117
118 rc = mdio_device_register(mdiodev);
119 if (rc) {
120 mdio_device_free(mdiodev);
121 of_node_put(child);
122 return rc;
123 }
124
125 dev_dbg(&mdio->dev, "registered mdio device %s at address %i\n",
126 child->name, addr);
127 return 0;
128}
129
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133
134
135
136static const struct of_device_id whitelist_phys[] = {
137 { .compatible = "brcm,40nm-ephy" },
138 { .compatible = "broadcom,bcm5241" },
139 { .compatible = "marvell,88E1111", },
140 { .compatible = "marvell,88e1116", },
141 { .compatible = "marvell,88e1118", },
142 { .compatible = "marvell,88e1145", },
143 { .compatible = "marvell,88e1149r", },
144 { .compatible = "marvell,88e1310", },
145 { .compatible = "marvell,88E1510", },
146 { .compatible = "marvell,88E1514", },
147 { .compatible = "moxa,moxart-rtl8201cp", },
148 {}
149};
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161
162static bool of_mdiobus_child_is_phy(struct device_node *child)
163{
164 u32 phy_id;
165
166 if (of_get_phy_id(child, &phy_id) != -EINVAL)
167 return true;
168
169 if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c45"))
170 return true;
171
172 if (of_device_is_compatible(child, "ethernet-phy-ieee802.3-c22"))
173 return true;
174
175 if (of_match_node(whitelist_phys, child)) {
176 pr_warn(FW_WARN
177 "%pOF: Whitelisted compatible string. Please remove\n",
178 child);
179 return true;
180 }
181
182 if (!of_find_property(child, "compatible", NULL))
183 return true;
184
185 return false;
186}
187
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195
196int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
197{
198 struct device_node *child;
199 bool scanphys = false;
200 int addr, rc;
201
202
203 if (!of_device_is_available(np))
204 return -ENODEV;
205
206
207
208 mdio->phy_mask = ~0;
209
210 mdio->dev.of_node = np;
211 mdio->dev.fwnode = of_fwnode_handle(np);
212
213
214 mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY;
215 of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us);
216
217
218 rc = mdiobus_register(mdio);
219 if (rc)
220 return rc;
221
222
223 for_each_available_child_of_node(np, child) {
224 addr = of_mdio_parse_addr(&mdio->dev, child);
225 if (addr < 0) {
226 scanphys = true;
227 continue;
228 }
229
230 if (of_mdiobus_child_is_phy(child))
231 rc = of_mdiobus_register_phy(mdio, child, addr);
232 else
233 rc = of_mdiobus_register_device(mdio, child, addr);
234
235 if (rc == -ENODEV)
236 dev_err(&mdio->dev,
237 "MDIO device at address %d is missing.\n",
238 addr);
239 else if (rc)
240 goto unregister;
241 }
242
243 if (!scanphys)
244 return 0;
245
246
247 for_each_available_child_of_node(np, child) {
248
249 if (of_find_property(child, "reg", NULL))
250 continue;
251
252 for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
253
254 if (mdiobus_is_registered_device(mdio, addr))
255 continue;
256
257
258 dev_info(&mdio->dev, "scan phy %s at address %i\n",
259 child->name, addr);
260
261 if (of_mdiobus_child_is_phy(child)) {
262 rc = of_mdiobus_register_phy(mdio, child, addr);
263 if (rc && rc != -ENODEV)
264 goto unregister;
265 }
266 }
267 }
268
269 return 0;
270
271unregister:
272 mdiobus_unregister(mdio);
273 return rc;
274}
275EXPORT_SYMBOL(of_mdiobus_register);
276
277
278static int of_phy_match(struct device *dev, void *phy_np)
279{
280 return dev->of_node == phy_np;
281}
282
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289
290struct phy_device *of_phy_find_device(struct device_node *phy_np)
291{
292 struct device *d;
293 struct mdio_device *mdiodev;
294
295 if (!phy_np)
296 return NULL;
297
298 d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match);
299 if (d) {
300 mdiodev = to_mdio_device(d);
301 if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
302 return to_phy_device(d);
303 put_device(d);
304 }
305
306 return NULL;
307}
308EXPORT_SYMBOL(of_phy_find_device);
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321
322struct phy_device *of_phy_connect(struct net_device *dev,
323 struct device_node *phy_np,
324 void (*hndlr)(struct net_device *), u32 flags,
325 phy_interface_t iface)
326{
327 struct phy_device *phy = of_phy_find_device(phy_np);
328 int ret;
329
330 if (!phy)
331 return NULL;
332
333 phy->dev_flags = flags;
334
335 ret = phy_connect_direct(dev, phy, hndlr, iface);
336
337
338 put_device(&phy->mdio.dev);
339
340 return ret ? NULL : phy;
341}
342EXPORT_SYMBOL(of_phy_connect);
343
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354
355struct phy_device *of_phy_get_and_connect(struct net_device *dev,
356 struct device_node *np,
357 void (*hndlr)(struct net_device *))
358{
359 phy_interface_t iface;
360 struct device_node *phy_np;
361 struct phy_device *phy;
362
363 iface = of_get_phy_mode(np);
364 if (iface < 0)
365 return NULL;
366
367 phy_np = of_parse_phandle(np, "phy-handle", 0);
368 if (!phy_np)
369 return NULL;
370
371 phy = of_phy_connect(dev, phy_np, hndlr, 0, iface);
372
373 of_node_put(phy_np);
374
375 return phy;
376}
377EXPORT_SYMBOL(of_phy_get_and_connect);
378
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388
389
390struct phy_device *of_phy_attach(struct net_device *dev,
391 struct device_node *phy_np, u32 flags,
392 phy_interface_t iface)
393{
394 struct phy_device *phy = of_phy_find_device(phy_np);
395 int ret;
396
397 if (!phy)
398 return NULL;
399
400 ret = phy_attach_direct(dev, phy, flags, iface);
401
402
403 put_device(&phy->mdio.dev);
404
405 return ret ? NULL : phy;
406}
407EXPORT_SYMBOL(of_phy_attach);
408
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411
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414
415
416
417bool of_phy_is_fixed_link(struct device_node *np)
418{
419 struct device_node *dn;
420 int len, err;
421 const char *managed;
422
423
424 dn = of_get_child_by_name(np, "fixed-link");
425 if (dn) {
426 of_node_put(dn);
427 return true;
428 }
429
430 err = of_property_read_string(np, "managed", &managed);
431 if (err == 0 && strcmp(managed, "auto") != 0)
432 return true;
433
434
435 if (of_get_property(np, "fixed-link", &len) &&
436 len == (5 * sizeof(__be32)))
437 return true;
438
439 return false;
440}
441EXPORT_SYMBOL(of_phy_is_fixed_link);
442
443int of_phy_register_fixed_link(struct device_node *np)
444{
445 struct fixed_phy_status status = {};
446 struct device_node *fixed_link_node;
447 u32 fixed_link_prop[5];
448 const char *managed;
449 int link_gpio = -1;
450
451 if (of_property_read_string(np, "managed", &managed) == 0 &&
452 strcmp(managed, "in-band-status") == 0) {
453
454 goto register_phy;
455 }
456
457
458 fixed_link_node = of_get_child_by_name(np, "fixed-link");
459 if (fixed_link_node) {
460 status.link = 1;
461 status.duplex = of_property_read_bool(fixed_link_node,
462 "full-duplex");
463 if (of_property_read_u32(fixed_link_node, "speed",
464 &status.speed)) {
465 of_node_put(fixed_link_node);
466 return -EINVAL;
467 }
468 status.pause = of_property_read_bool(fixed_link_node, "pause");
469 status.asym_pause = of_property_read_bool(fixed_link_node,
470 "asym-pause");
471 link_gpio = of_get_named_gpio_flags(fixed_link_node,
472 "link-gpios", 0, NULL);
473 of_node_put(fixed_link_node);
474 if (link_gpio == -EPROBE_DEFER)
475 return -EPROBE_DEFER;
476
477 goto register_phy;
478 }
479
480
481 if (of_property_read_u32_array(np, "fixed-link", fixed_link_prop,
482 ARRAY_SIZE(fixed_link_prop)) == 0) {
483 status.link = 1;
484 status.duplex = fixed_link_prop[1];
485 status.speed = fixed_link_prop[2];
486 status.pause = fixed_link_prop[3];
487 status.asym_pause = fixed_link_prop[4];
488 goto register_phy;
489 }
490
491 return -ENODEV;
492
493register_phy:
494 return PTR_ERR_OR_ZERO(fixed_phy_register(PHY_POLL, &status, link_gpio,
495 np));
496}
497EXPORT_SYMBOL(of_phy_register_fixed_link);
498
499void of_phy_deregister_fixed_link(struct device_node *np)
500{
501 struct phy_device *phydev;
502
503 phydev = of_phy_find_device(np);
504 if (!phydev)
505 return;
506
507 fixed_phy_unregister(phydev);
508
509 put_device(&phydev->mdio.dev);
510 phy_device_free(phydev);
511}
512EXPORT_SYMBOL(of_phy_deregister_fixed_link);
513