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8bc487d1 GL |
1 | /* |
2 | * OF helpers for the MDIO (Ethernet PHY) API | |
3 | * | |
4 | * Copyright (c) 2009 Secret Lab Technologies, Ltd. | |
5 | * | |
6 | * This file is released under the GPLv2 | |
7 | * | |
8 | * This file provides helper functions for extracting PHY device information | |
9 | * out of the OpenFirmware device tree and using it to populate an mii_bus. | |
10 | */ | |
11 | ||
24c30dbb AV |
12 | #include <linux/kernel.h> |
13 | #include <linux/device.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <linux/err.h> | |
8bc487d1 | 16 | #include <linux/phy.h> |
3be2a49e | 17 | #include <linux/phy_fixed.h> |
8bc487d1 | 18 | #include <linux/of.h> |
e3873444 | 19 | #include <linux/of_irq.h> |
8bc487d1 GL |
20 | #include <linux/of_mdio.h> |
21 | #include <linux/module.h> | |
22 | ||
23 | MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); | |
24 | MODULE_LICENSE("GPL"); | |
25 | ||
3c6f5592 JG |
26 | /* Extract the clause 22 phy ID from the compatible string of the form |
27 | * ethernet-phy-idAAAA.BBBB */ | |
28 | static int of_get_phy_id(struct device_node *device, u32 *phy_id) | |
29 | { | |
30 | struct property *prop; | |
31 | const char *cp; | |
32 | unsigned int upper, lower; | |
33 | ||
34 | of_property_for_each_string(device, "compatible", prop, cp) { | |
35 | if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) { | |
36 | *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF); | |
37 | return 0; | |
38 | } | |
39 | } | |
40 | return -EINVAL; | |
41 | } | |
42 | ||
2e79cb30 FF |
43 | static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *child, |
44 | u32 addr) | |
45 | { | |
46 | struct phy_device *phy; | |
47 | bool is_c45; | |
f15c586d | 48 | int rc; |
3c6f5592 | 49 | u32 phy_id; |
2e79cb30 FF |
50 | |
51 | is_c45 = of_device_is_compatible(child, | |
52 | "ethernet-phy-ieee802.3-c45"); | |
53 | ||
3c6f5592 JG |
54 | if (!is_c45 && !of_get_phy_id(child, &phy_id)) |
55 | phy = phy_device_create(mdio, addr, phy_id, 0, NULL); | |
56 | else | |
57 | phy = get_phy_device(mdio, addr, is_c45); | |
2e79cb30 FF |
58 | if (!phy || IS_ERR(phy)) |
59 | return 1; | |
60 | ||
f15c586d BD |
61 | rc = irq_of_parse_and_map(child, 0); |
62 | if (rc > 0) { | |
63 | phy->irq = rc; | |
64 | if (mdio->irq) | |
65 | mdio->irq[addr] = rc; | |
66 | } else { | |
67 | if (mdio->irq) | |
68 | phy->irq = mdio->irq[addr]; | |
2e79cb30 FF |
69 | } |
70 | ||
ab6016e0 FF |
71 | if (of_property_read_bool(child, "broken-turn-around")) |
72 | mdio->phy_ignore_ta_mask |= 1 << addr; | |
73 | ||
2e79cb30 FF |
74 | /* Associate the OF node with the device structure so it |
75 | * can be looked up later */ | |
76 | of_node_get(child); | |
77 | phy->dev.of_node = child; | |
78 | ||
79 | /* All data is now stored in the phy struct; | |
80 | * register it */ | |
81 | rc = phy_device_register(phy); | |
82 | if (rc) { | |
83 | phy_device_free(phy); | |
84 | of_node_put(child); | |
85 | return 1; | |
86 | } | |
87 | ||
88 | dev_dbg(&mdio->dev, "registered phy %s at address %i\n", | |
8fdade4b | 89 | child->name, addr); |
2e79cb30 FF |
90 | |
91 | return 0; | |
92 | } | |
93 | ||
33d67377 | 94 | int of_mdio_parse_addr(struct device *dev, const struct device_node *np) |
8f838288 DM |
95 | { |
96 | u32 addr; | |
97 | int ret; | |
98 | ||
99 | ret = of_property_read_u32(np, "reg", &addr); | |
100 | if (ret < 0) { | |
101 | dev_err(dev, "%s has invalid PHY address\n", np->full_name); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | /* A PHY must have a reg property in the range [0-31] */ | |
106 | if (addr >= PHY_MAX_ADDR) { | |
107 | dev_err(dev, "%s PHY address %i is too large\n", | |
108 | np->full_name, addr); | |
109 | return -EINVAL; | |
110 | } | |
111 | ||
112 | return addr; | |
113 | } | |
33d67377 | 114 | EXPORT_SYMBOL(of_mdio_parse_addr); |
8f838288 | 115 | |
8bc487d1 GL |
116 | /** |
117 | * of_mdiobus_register - Register mii_bus and create PHYs from the device tree | |
118 | * @mdio: pointer to mii_bus structure | |
119 | * @np: pointer to device_node of MDIO bus. | |
120 | * | |
121 | * This function registers the mii_bus structure and registers a phy_device | |
122 | * for each child node of @np. | |
123 | */ | |
124 | int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np) | |
125 | { | |
8bc487d1 | 126 | struct device_node *child; |
779d835e | 127 | const __be32 *paddr; |
2e79cb30 | 128 | bool scanphys = false; |
4cd984b0 | 129 | int addr, rc, i; |
8bc487d1 GL |
130 | |
131 | /* Mask out all PHYs from auto probing. Instead the PHYs listed in | |
132 | * the device tree are populated after the bus has been registered */ | |
133 | mdio->phy_mask = ~0; | |
134 | ||
135 | /* Clear all the IRQ properties */ | |
136 | if (mdio->irq) | |
137 | for (i=0; i<PHY_MAX_ADDR; i++) | |
138 | mdio->irq[i] = PHY_POLL; | |
139 | ||
25106022 DD |
140 | mdio->dev.of_node = np; |
141 | ||
8bc487d1 GL |
142 | /* Register the MDIO bus */ |
143 | rc = mdiobus_register(mdio); | |
144 | if (rc) | |
145 | return rc; | |
146 | ||
147 | /* Loop over the child nodes and register a phy_device for each one */ | |
e207e761 | 148 | for_each_available_child_of_node(np, child) { |
8f838288 DM |
149 | addr = of_mdio_parse_addr(&mdio->dev, child); |
150 | if (addr < 0) { | |
779d835e | 151 | scanphys = true; |
19458860 DD |
152 | continue; |
153 | } | |
154 | ||
2e79cb30 FF |
155 | rc = of_mdiobus_register_phy(mdio, child, addr); |
156 | if (rc) | |
8bc487d1 | 157 | continue; |
8bc487d1 GL |
158 | } |
159 | ||
779d835e SH |
160 | if (!scanphys) |
161 | return 0; | |
162 | ||
163 | /* auto scan for PHYs with empty reg property */ | |
164 | for_each_available_child_of_node(np, child) { | |
165 | /* Skip PHYs with reg property set */ | |
24f28dde | 166 | paddr = of_get_property(child, "reg", NULL); |
779d835e SH |
167 | if (paddr) |
168 | continue; | |
169 | ||
779d835e SH |
170 | for (addr = 0; addr < PHY_MAX_ADDR; addr++) { |
171 | /* skip already registered PHYs */ | |
172 | if (mdio->phy_map[addr]) | |
173 | continue; | |
174 | ||
175 | /* be noisy to encourage people to set reg property */ | |
176 | dev_info(&mdio->dev, "scan phy %s at address %i\n", | |
177 | child->name, addr); | |
178 | ||
2e79cb30 FF |
179 | rc = of_mdiobus_register_phy(mdio, child, addr); |
180 | if (rc) | |
779d835e | 181 | continue; |
779d835e SH |
182 | } |
183 | } | |
184 | ||
8bc487d1 GL |
185 | return 0; |
186 | } | |
187 | EXPORT_SYMBOL(of_mdiobus_register); | |
188 | ||
08a7963a JP |
189 | /* Helper function for of_phy_find_device */ |
190 | static int of_phy_match(struct device *dev, void *phy_np) | |
191 | { | |
61c7a080 | 192 | return dev->of_node == phy_np; |
08a7963a JP |
193 | } |
194 | ||
8bc487d1 GL |
195 | /** |
196 | * of_phy_find_device - Give a PHY node, find the phy_device | |
197 | * @phy_np: Pointer to the phy's device tree node | |
198 | * | |
199 | * Returns a pointer to the phy_device. | |
200 | */ | |
201 | struct phy_device *of_phy_find_device(struct device_node *phy_np) | |
202 | { | |
203 | struct device *d; | |
8bc487d1 GL |
204 | if (!phy_np) |
205 | return NULL; | |
206 | ||
08a7963a | 207 | d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match); |
8bc487d1 GL |
208 | return d ? to_phy_device(d) : NULL; |
209 | } | |
210 | EXPORT_SYMBOL(of_phy_find_device); | |
211 | ||
212 | /** | |
213 | * of_phy_connect - Connect to the phy described in the device tree | |
214 | * @dev: pointer to net_device claiming the phy | |
215 | * @phy_np: Pointer to device tree node for the PHY | |
216 | * @hndlr: Link state callback for the network device | |
217 | * @iface: PHY data interface type | |
218 | * | |
25985edc | 219 | * Returns a pointer to the phy_device if successful. NULL otherwise |
8bc487d1 GL |
220 | */ |
221 | struct phy_device *of_phy_connect(struct net_device *dev, | |
222 | struct device_node *phy_np, | |
223 | void (*hndlr)(struct net_device *), u32 flags, | |
224 | phy_interface_t iface) | |
225 | { | |
226 | struct phy_device *phy = of_phy_find_device(phy_np); | |
227 | ||
228 | if (!phy) | |
229 | return NULL; | |
230 | ||
2f637151 FF |
231 | phy->dev_flags = flags; |
232 | ||
f9a8f83b | 233 | return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy; |
8bc487d1 GL |
234 | } |
235 | EXPORT_SYMBOL(of_phy_connect); | |
24c30dbb | 236 | |
7614aba6 AF |
237 | /** |
238 | * of_phy_attach - Attach to a PHY without starting the state machine | |
239 | * @dev: pointer to net_device claiming the phy | |
240 | * @phy_np: Node pointer for the PHY | |
241 | * @flags: flags to pass to the PHY | |
242 | * @iface: PHY data interface type | |
243 | */ | |
244 | struct phy_device *of_phy_attach(struct net_device *dev, | |
245 | struct device_node *phy_np, u32 flags, | |
246 | phy_interface_t iface) | |
247 | { | |
248 | struct phy_device *phy = of_phy_find_device(phy_np); | |
249 | ||
250 | if (!phy) | |
251 | return NULL; | |
252 | ||
253 | return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy; | |
254 | } | |
255 | EXPORT_SYMBOL(of_phy_attach); | |
3be2a49e TP |
256 | |
257 | #if defined(CONFIG_FIXED_PHY) | |
258 | /* | |
259 | * of_phy_is_fixed_link() and of_phy_register_fixed_link() must | |
260 | * support two DT bindings: | |
261 | * - the old DT binding, where 'fixed-link' was a property with 5 | |
262 | * cells encoding various informations about the fixed PHY | |
263 | * - the new DT binding, where 'fixed-link' is a sub-node of the | |
264 | * Ethernet device. | |
265 | */ | |
266 | bool of_phy_is_fixed_link(struct device_node *np) | |
267 | { | |
268 | struct device_node *dn; | |
4cba5c21 SS |
269 | int len, err; |
270 | const char *managed; | |
3be2a49e TP |
271 | |
272 | /* New binding */ | |
273 | dn = of_get_child_by_name(np, "fixed-link"); | |
274 | if (dn) { | |
275 | of_node_put(dn); | |
276 | return true; | |
277 | } | |
278 | ||
4cba5c21 SS |
279 | err = of_property_read_string(np, "managed", &managed); |
280 | if (err == 0 && strcmp(managed, "auto") != 0) | |
281 | return true; | |
282 | ||
3be2a49e TP |
283 | /* Old binding */ |
284 | if (of_get_property(np, "fixed-link", &len) && | |
285 | len == (5 * sizeof(__be32))) | |
286 | return true; | |
287 | ||
288 | return false; | |
289 | } | |
290 | EXPORT_SYMBOL(of_phy_is_fixed_link); | |
291 | ||
292 | int of_phy_register_fixed_link(struct device_node *np) | |
293 | { | |
294 | struct fixed_phy_status status = {}; | |
295 | struct device_node *fixed_link_node; | |
296 | const __be32 *fixed_link_prop; | |
4cba5c21 | 297 | int len, err; |
fd2ef0ba | 298 | struct phy_device *phy; |
4cba5c21 SS |
299 | const char *managed; |
300 | ||
301 | err = of_property_read_string(np, "managed", &managed); | |
302 | if (err == 0) { | |
303 | if (strcmp(managed, "in-band-status") == 0) { | |
304 | /* status is zeroed, namely its .link member */ | |
305 | phy = fixed_phy_register(PHY_POLL, &status, np); | |
306 | return IS_ERR(phy) ? PTR_ERR(phy) : 0; | |
307 | } | |
308 | } | |
3be2a49e TP |
309 | |
310 | /* New binding */ | |
311 | fixed_link_node = of_get_child_by_name(np, "fixed-link"); | |
312 | if (fixed_link_node) { | |
313 | status.link = 1; | |
a72e1541 RR |
314 | status.duplex = of_property_read_bool(fixed_link_node, |
315 | "full-duplex"); | |
3be2a49e TP |
316 | if (of_property_read_u32(fixed_link_node, "speed", &status.speed)) |
317 | return -EINVAL; | |
a72e1541 RR |
318 | status.pause = of_property_read_bool(fixed_link_node, "pause"); |
319 | status.asym_pause = of_property_read_bool(fixed_link_node, | |
320 | "asym-pause"); | |
3be2a49e | 321 | of_node_put(fixed_link_node); |
fd2ef0ba PG |
322 | phy = fixed_phy_register(PHY_POLL, &status, np); |
323 | return IS_ERR(phy) ? PTR_ERR(phy) : 0; | |
3be2a49e TP |
324 | } |
325 | ||
326 | /* Old binding */ | |
327 | fixed_link_prop = of_get_property(np, "fixed-link", &len); | |
328 | if (fixed_link_prop && len == (5 * sizeof(__be32))) { | |
329 | status.link = 1; | |
330 | status.duplex = be32_to_cpu(fixed_link_prop[1]); | |
331 | status.speed = be32_to_cpu(fixed_link_prop[2]); | |
332 | status.pause = be32_to_cpu(fixed_link_prop[3]); | |
333 | status.asym_pause = be32_to_cpu(fixed_link_prop[4]); | |
fd2ef0ba PG |
334 | phy = fixed_phy_register(PHY_POLL, &status, np); |
335 | return IS_ERR(phy) ? PTR_ERR(phy) : 0; | |
3be2a49e TP |
336 | } |
337 | ||
338 | return -ENODEV; | |
339 | } | |
340 | EXPORT_SYMBOL(of_phy_register_fixed_link); | |
341 | #endif |