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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 | ||
71 | /* Associate the OF node with the device structure so it | |
72 | * can be looked up later */ | |
73 | of_node_get(child); | |
74 | phy->dev.of_node = child; | |
75 | ||
76 | /* All data is now stored in the phy struct; | |
77 | * register it */ | |
78 | rc = phy_device_register(phy); | |
79 | if (rc) { | |
80 | phy_device_free(phy); | |
81 | of_node_put(child); | |
82 | return 1; | |
83 | } | |
84 | ||
85 | dev_dbg(&mdio->dev, "registered phy %s at address %i\n", | |
8fdade4b | 86 | child->name, addr); |
2e79cb30 FF |
87 | |
88 | return 0; | |
89 | } | |
90 | ||
8f838288 DM |
91 | static int of_mdio_parse_addr(struct device *dev, const struct device_node *np) |
92 | { | |
93 | u32 addr; | |
94 | int ret; | |
95 | ||
96 | ret = of_property_read_u32(np, "reg", &addr); | |
97 | if (ret < 0) { | |
98 | dev_err(dev, "%s has invalid PHY address\n", np->full_name); | |
99 | return ret; | |
100 | } | |
101 | ||
102 | /* A PHY must have a reg property in the range [0-31] */ | |
103 | if (addr >= PHY_MAX_ADDR) { | |
104 | dev_err(dev, "%s PHY address %i is too large\n", | |
105 | np->full_name, addr); | |
106 | return -EINVAL; | |
107 | } | |
108 | ||
109 | return addr; | |
110 | } | |
111 | ||
8bc487d1 GL |
112 | /** |
113 | * of_mdiobus_register - Register mii_bus and create PHYs from the device tree | |
114 | * @mdio: pointer to mii_bus structure | |
115 | * @np: pointer to device_node of MDIO bus. | |
116 | * | |
117 | * This function registers the mii_bus structure and registers a phy_device | |
118 | * for each child node of @np. | |
119 | */ | |
120 | int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np) | |
121 | { | |
8bc487d1 | 122 | struct device_node *child; |
779d835e | 123 | const __be32 *paddr; |
2e79cb30 | 124 | bool scanphys = false; |
4cd984b0 | 125 | int addr, rc, i; |
8bc487d1 GL |
126 | |
127 | /* Mask out all PHYs from auto probing. Instead the PHYs listed in | |
128 | * the device tree are populated after the bus has been registered */ | |
129 | mdio->phy_mask = ~0; | |
130 | ||
131 | /* Clear all the IRQ properties */ | |
132 | if (mdio->irq) | |
133 | for (i=0; i<PHY_MAX_ADDR; i++) | |
134 | mdio->irq[i] = PHY_POLL; | |
135 | ||
25106022 DD |
136 | mdio->dev.of_node = np; |
137 | ||
8bc487d1 GL |
138 | /* Register the MDIO bus */ |
139 | rc = mdiobus_register(mdio); | |
140 | if (rc) | |
141 | return rc; | |
142 | ||
143 | /* Loop over the child nodes and register a phy_device for each one */ | |
e207e761 | 144 | for_each_available_child_of_node(np, child) { |
8f838288 DM |
145 | addr = of_mdio_parse_addr(&mdio->dev, child); |
146 | if (addr < 0) { | |
779d835e | 147 | scanphys = true; |
19458860 DD |
148 | continue; |
149 | } | |
150 | ||
2e79cb30 FF |
151 | rc = of_mdiobus_register_phy(mdio, child, addr); |
152 | if (rc) | |
8bc487d1 | 153 | continue; |
8bc487d1 GL |
154 | } |
155 | ||
779d835e SH |
156 | if (!scanphys) |
157 | return 0; | |
158 | ||
159 | /* auto scan for PHYs with empty reg property */ | |
160 | for_each_available_child_of_node(np, child) { | |
161 | /* Skip PHYs with reg property set */ | |
24f28dde | 162 | paddr = of_get_property(child, "reg", NULL); |
779d835e SH |
163 | if (paddr) |
164 | continue; | |
165 | ||
779d835e SH |
166 | for (addr = 0; addr < PHY_MAX_ADDR; addr++) { |
167 | /* skip already registered PHYs */ | |
168 | if (mdio->phy_map[addr]) | |
169 | continue; | |
170 | ||
171 | /* be noisy to encourage people to set reg property */ | |
172 | dev_info(&mdio->dev, "scan phy %s at address %i\n", | |
173 | child->name, addr); | |
174 | ||
2e79cb30 FF |
175 | rc = of_mdiobus_register_phy(mdio, child, addr); |
176 | if (rc) | |
779d835e | 177 | continue; |
779d835e SH |
178 | } |
179 | } | |
180 | ||
8bc487d1 GL |
181 | return 0; |
182 | } | |
183 | EXPORT_SYMBOL(of_mdiobus_register); | |
184 | ||
86f6cf41 DM |
185 | /** |
186 | * of_mdiobus_link_phydev - Find a device node for a phy | |
187 | * @mdio: pointer to mii_bus structure | |
188 | * @phydev: phydev for which the of_node pointer should be set | |
189 | * | |
190 | * Walk the list of subnodes of a mdio bus and look for a node that matches the | |
191 | * phy's address with its 'reg' property. If found, set the of_node pointer for | |
192 | * the phy. This allows auto-probed pyh devices to be supplied with information | |
193 | * passed in via DT. | |
194 | */ | |
195 | void of_mdiobus_link_phydev(struct mii_bus *mdio, | |
196 | struct phy_device *phydev) | |
197 | { | |
198 | struct device *dev = &phydev->dev; | |
199 | struct device_node *child; | |
200 | ||
201 | if (dev->of_node || !mdio->dev.of_node) | |
202 | return; | |
203 | ||
204 | for_each_available_child_of_node(mdio->dev.of_node, child) { | |
205 | int addr; | |
206 | ||
207 | addr = of_mdio_parse_addr(&mdio->dev, child); | |
208 | if (addr < 0) | |
209 | continue; | |
210 | ||
211 | if (addr == phydev->addr) { | |
212 | dev->of_node = child; | |
213 | return; | |
214 | } | |
215 | } | |
216 | } | |
e067ee33 | 217 | EXPORT_SYMBOL(of_mdiobus_link_phydev); |
86f6cf41 | 218 | |
08a7963a JP |
219 | /* Helper function for of_phy_find_device */ |
220 | static int of_phy_match(struct device *dev, void *phy_np) | |
221 | { | |
61c7a080 | 222 | return dev->of_node == phy_np; |
08a7963a JP |
223 | } |
224 | ||
8bc487d1 GL |
225 | /** |
226 | * of_phy_find_device - Give a PHY node, find the phy_device | |
227 | * @phy_np: Pointer to the phy's device tree node | |
228 | * | |
229 | * Returns a pointer to the phy_device. | |
230 | */ | |
231 | struct phy_device *of_phy_find_device(struct device_node *phy_np) | |
232 | { | |
233 | struct device *d; | |
8bc487d1 GL |
234 | if (!phy_np) |
235 | return NULL; | |
236 | ||
08a7963a | 237 | d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match); |
8bc487d1 GL |
238 | return d ? to_phy_device(d) : NULL; |
239 | } | |
240 | EXPORT_SYMBOL(of_phy_find_device); | |
241 | ||
242 | /** | |
243 | * of_phy_connect - Connect to the phy described in the device tree | |
244 | * @dev: pointer to net_device claiming the phy | |
245 | * @phy_np: Pointer to device tree node for the PHY | |
246 | * @hndlr: Link state callback for the network device | |
247 | * @iface: PHY data interface type | |
248 | * | |
25985edc | 249 | * Returns a pointer to the phy_device if successful. NULL otherwise |
8bc487d1 GL |
250 | */ |
251 | struct phy_device *of_phy_connect(struct net_device *dev, | |
252 | struct device_node *phy_np, | |
253 | void (*hndlr)(struct net_device *), u32 flags, | |
254 | phy_interface_t iface) | |
255 | { | |
256 | struct phy_device *phy = of_phy_find_device(phy_np); | |
257 | ||
258 | if (!phy) | |
259 | return NULL; | |
260 | ||
f9a8f83b | 261 | return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy; |
8bc487d1 GL |
262 | } |
263 | EXPORT_SYMBOL(of_phy_connect); | |
24c30dbb | 264 | |
7614aba6 AF |
265 | /** |
266 | * of_phy_attach - Attach to a PHY without starting the state machine | |
267 | * @dev: pointer to net_device claiming the phy | |
268 | * @phy_np: Node pointer for the PHY | |
269 | * @flags: flags to pass to the PHY | |
270 | * @iface: PHY data interface type | |
271 | */ | |
272 | struct phy_device *of_phy_attach(struct net_device *dev, | |
273 | struct device_node *phy_np, u32 flags, | |
274 | phy_interface_t iface) | |
275 | { | |
276 | struct phy_device *phy = of_phy_find_device(phy_np); | |
277 | ||
278 | if (!phy) | |
279 | return NULL; | |
280 | ||
281 | return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy; | |
282 | } | |
283 | EXPORT_SYMBOL(of_phy_attach); | |
3be2a49e TP |
284 | |
285 | #if defined(CONFIG_FIXED_PHY) | |
286 | /* | |
287 | * of_phy_is_fixed_link() and of_phy_register_fixed_link() must | |
288 | * support two DT bindings: | |
289 | * - the old DT binding, where 'fixed-link' was a property with 5 | |
290 | * cells encoding various informations about the fixed PHY | |
291 | * - the new DT binding, where 'fixed-link' is a sub-node of the | |
292 | * Ethernet device. | |
293 | */ | |
294 | bool of_phy_is_fixed_link(struct device_node *np) | |
295 | { | |
296 | struct device_node *dn; | |
297 | int len; | |
298 | ||
299 | /* New binding */ | |
300 | dn = of_get_child_by_name(np, "fixed-link"); | |
301 | if (dn) { | |
302 | of_node_put(dn); | |
303 | return true; | |
304 | } | |
305 | ||
306 | /* Old binding */ | |
307 | if (of_get_property(np, "fixed-link", &len) && | |
308 | len == (5 * sizeof(__be32))) | |
309 | return true; | |
310 | ||
311 | return false; | |
312 | } | |
313 | EXPORT_SYMBOL(of_phy_is_fixed_link); | |
314 | ||
315 | int of_phy_register_fixed_link(struct device_node *np) | |
316 | { | |
317 | struct fixed_phy_status status = {}; | |
318 | struct device_node *fixed_link_node; | |
319 | const __be32 *fixed_link_prop; | |
320 | int len; | |
321 | ||
322 | /* New binding */ | |
323 | fixed_link_node = of_get_child_by_name(np, "fixed-link"); | |
324 | if (fixed_link_node) { | |
325 | status.link = 1; | |
326 | status.duplex = of_property_read_bool(np, "full-duplex"); | |
327 | if (of_property_read_u32(fixed_link_node, "speed", &status.speed)) | |
328 | return -EINVAL; | |
329 | status.pause = of_property_read_bool(np, "pause"); | |
330 | status.asym_pause = of_property_read_bool(np, "asym-pause"); | |
331 | of_node_put(fixed_link_node); | |
332 | return fixed_phy_register(PHY_POLL, &status, np); | |
333 | } | |
334 | ||
335 | /* Old binding */ | |
336 | fixed_link_prop = of_get_property(np, "fixed-link", &len); | |
337 | if (fixed_link_prop && len == (5 * sizeof(__be32))) { | |
338 | status.link = 1; | |
339 | status.duplex = be32_to_cpu(fixed_link_prop[1]); | |
340 | status.speed = be32_to_cpu(fixed_link_prop[2]); | |
341 | status.pause = be32_to_cpu(fixed_link_prop[3]); | |
342 | status.asym_pause = be32_to_cpu(fixed_link_prop[4]); | |
343 | return fixed_phy_register(PHY_POLL, &status, np); | |
344 | } | |
345 | ||
346 | return -ENODEV; | |
347 | } | |
348 | EXPORT_SYMBOL(of_phy_register_fixed_link); | |
349 | #endif |