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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 GL |
16 | #include <linux/phy.h> |
17 | #include <linux/of.h> | |
e3873444 | 18 | #include <linux/of_irq.h> |
8bc487d1 GL |
19 | #include <linux/of_mdio.h> |
20 | #include <linux/module.h> | |
21 | ||
22 | MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>"); | |
23 | MODULE_LICENSE("GPL"); | |
24 | ||
8fdade4b FF |
25 | static void of_set_phy_supported(struct phy_device *phydev, u32 max_speed) |
26 | { | |
ce11c436 FF |
27 | /* The default values for phydev->supported are provided by the PHY |
28 | * driver "features" member, we want to reset to sane defaults fist | |
29 | * before supporting higher speeds. | |
30 | */ | |
31 | phydev->supported &= PHY_DEFAULT_FEATURES; | |
8fdade4b FF |
32 | |
33 | switch (max_speed) { | |
34 | default: | |
35 | return; | |
36 | ||
37 | case SPEED_1000: | |
38 | phydev->supported |= PHY_1000BT_FEATURES; | |
39 | case SPEED_100: | |
40 | phydev->supported |= PHY_100BT_FEATURES; | |
41 | case SPEED_10: | |
42 | phydev->supported |= PHY_10BT_FEATURES; | |
43 | } | |
44 | } | |
45 | ||
2e79cb30 FF |
46 | static int of_mdiobus_register_phy(struct mii_bus *mdio, struct device_node *child, |
47 | u32 addr) | |
48 | { | |
49 | struct phy_device *phy; | |
50 | bool is_c45; | |
7d976376 | 51 | int rc, prev_irq; |
8fdade4b | 52 | u32 max_speed = 0; |
2e79cb30 FF |
53 | |
54 | is_c45 = of_device_is_compatible(child, | |
55 | "ethernet-phy-ieee802.3-c45"); | |
56 | ||
57 | phy = get_phy_device(mdio, addr, is_c45); | |
58 | if (!phy || IS_ERR(phy)) | |
59 | return 1; | |
60 | ||
61 | if (mdio->irq) { | |
7d976376 | 62 | prev_irq = mdio->irq[addr]; |
2e79cb30 FF |
63 | mdio->irq[addr] = |
64 | irq_of_parse_and_map(child, 0); | |
65 | if (!mdio->irq[addr]) | |
7d976376 | 66 | mdio->irq[addr] = prev_irq; |
2e79cb30 FF |
67 | } |
68 | ||
69 | /* Associate the OF node with the device structure so it | |
70 | * can be looked up later */ | |
71 | of_node_get(child); | |
72 | phy->dev.of_node = child; | |
73 | ||
74 | /* All data is now stored in the phy struct; | |
75 | * register it */ | |
76 | rc = phy_device_register(phy); | |
77 | if (rc) { | |
78 | phy_device_free(phy); | |
79 | of_node_put(child); | |
80 | return 1; | |
81 | } | |
82 | ||
8fdade4b FF |
83 | /* Set phydev->supported based on the "max-speed" property |
84 | * if present */ | |
85 | if (!of_property_read_u32(child, "max-speed", &max_speed)) | |
86 | of_set_phy_supported(phy, max_speed); | |
87 | ||
2e79cb30 | 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 | ||
8bc487d1 GL |
94 | /** |
95 | * of_mdiobus_register - Register mii_bus and create PHYs from the device tree | |
96 | * @mdio: pointer to mii_bus structure | |
97 | * @np: pointer to device_node of MDIO bus. | |
98 | * | |
99 | * This function registers the mii_bus structure and registers a phy_device | |
100 | * for each child node of @np. | |
101 | */ | |
102 | int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np) | |
103 | { | |
8bc487d1 | 104 | struct device_node *child; |
779d835e SH |
105 | const __be32 *paddr; |
106 | u32 addr; | |
2e79cb30 | 107 | bool scanphys = false; |
779d835e | 108 | int rc, i, len; |
8bc487d1 GL |
109 | |
110 | /* Mask out all PHYs from auto probing. Instead the PHYs listed in | |
111 | * the device tree are populated after the bus has been registered */ | |
112 | mdio->phy_mask = ~0; | |
113 | ||
114 | /* Clear all the IRQ properties */ | |
115 | if (mdio->irq) | |
116 | for (i=0; i<PHY_MAX_ADDR; i++) | |
117 | mdio->irq[i] = PHY_POLL; | |
118 | ||
25106022 DD |
119 | mdio->dev.of_node = np; |
120 | ||
8bc487d1 GL |
121 | /* Register the MDIO bus */ |
122 | rc = mdiobus_register(mdio); | |
123 | if (rc) | |
124 | return rc; | |
125 | ||
126 | /* Loop over the child nodes and register a phy_device for each one */ | |
e207e761 | 127 | for_each_available_child_of_node(np, child) { |
8bc487d1 | 128 | /* A PHY must have a reg property in the range [0-31] */ |
19458860 DD |
129 | paddr = of_get_property(child, "reg", &len); |
130 | if (!paddr || len < sizeof(*paddr)) { | |
779d835e | 131 | scanphys = true; |
8bc487d1 GL |
132 | dev_err(&mdio->dev, "%s has invalid PHY address\n", |
133 | child->full_name); | |
134 | continue; | |
135 | } | |
136 | ||
19458860 | 137 | addr = be32_to_cpup(paddr); |
bed2f9ed | 138 | if (addr >= PHY_MAX_ADDR) { |
19458860 DD |
139 | dev_err(&mdio->dev, "%s PHY address %i is too large\n", |
140 | child->full_name, addr); | |
141 | continue; | |
142 | } | |
143 | ||
2e79cb30 FF |
144 | rc = of_mdiobus_register_phy(mdio, child, addr); |
145 | if (rc) | |
8bc487d1 | 146 | continue; |
8bc487d1 GL |
147 | } |
148 | ||
779d835e SH |
149 | if (!scanphys) |
150 | return 0; | |
151 | ||
152 | /* auto scan for PHYs with empty reg property */ | |
153 | for_each_available_child_of_node(np, child) { | |
154 | /* Skip PHYs with reg property set */ | |
155 | paddr = of_get_property(child, "reg", &len); | |
156 | if (paddr) | |
157 | continue; | |
158 | ||
779d835e SH |
159 | for (addr = 0; addr < PHY_MAX_ADDR; addr++) { |
160 | /* skip already registered PHYs */ | |
161 | if (mdio->phy_map[addr]) | |
162 | continue; | |
163 | ||
164 | /* be noisy to encourage people to set reg property */ | |
165 | dev_info(&mdio->dev, "scan phy %s at address %i\n", | |
166 | child->name, addr); | |
167 | ||
2e79cb30 FF |
168 | rc = of_mdiobus_register_phy(mdio, child, addr); |
169 | if (rc) | |
779d835e | 170 | continue; |
779d835e SH |
171 | } |
172 | } | |
173 | ||
8bc487d1 GL |
174 | return 0; |
175 | } | |
176 | EXPORT_SYMBOL(of_mdiobus_register); | |
177 | ||
08a7963a JP |
178 | /* Helper function for of_phy_find_device */ |
179 | static int of_phy_match(struct device *dev, void *phy_np) | |
180 | { | |
61c7a080 | 181 | return dev->of_node == phy_np; |
08a7963a JP |
182 | } |
183 | ||
8bc487d1 GL |
184 | /** |
185 | * of_phy_find_device - Give a PHY node, find the phy_device | |
186 | * @phy_np: Pointer to the phy's device tree node | |
187 | * | |
188 | * Returns a pointer to the phy_device. | |
189 | */ | |
190 | struct phy_device *of_phy_find_device(struct device_node *phy_np) | |
191 | { | |
192 | struct device *d; | |
8bc487d1 GL |
193 | if (!phy_np) |
194 | return NULL; | |
195 | ||
08a7963a | 196 | d = bus_find_device(&mdio_bus_type, NULL, phy_np, of_phy_match); |
8bc487d1 GL |
197 | return d ? to_phy_device(d) : NULL; |
198 | } | |
199 | EXPORT_SYMBOL(of_phy_find_device); | |
200 | ||
201 | /** | |
202 | * of_phy_connect - Connect to the phy described in the device tree | |
203 | * @dev: pointer to net_device claiming the phy | |
204 | * @phy_np: Pointer to device tree node for the PHY | |
205 | * @hndlr: Link state callback for the network device | |
206 | * @iface: PHY data interface type | |
207 | * | |
25985edc | 208 | * Returns a pointer to the phy_device if successful. NULL otherwise |
8bc487d1 GL |
209 | */ |
210 | struct phy_device *of_phy_connect(struct net_device *dev, | |
211 | struct device_node *phy_np, | |
212 | void (*hndlr)(struct net_device *), u32 flags, | |
213 | phy_interface_t iface) | |
214 | { | |
215 | struct phy_device *phy = of_phy_find_device(phy_np); | |
216 | ||
217 | if (!phy) | |
218 | return NULL; | |
219 | ||
f9a8f83b | 220 | return phy_connect_direct(dev, phy, hndlr, iface) ? NULL : phy; |
8bc487d1 GL |
221 | } |
222 | EXPORT_SYMBOL(of_phy_connect); | |
24c30dbb AV |
223 | |
224 | /** | |
225 | * of_phy_connect_fixed_link - Parse fixed-link property and return a dummy phy | |
226 | * @dev: pointer to net_device claiming the phy | |
227 | * @hndlr: Link state callback for the network device | |
228 | * @iface: PHY data interface type | |
229 | * | |
230 | * This function is a temporary stop-gap and will be removed soon. It is | |
231 | * only to support the fs_enet, ucc_geth and gianfar Ethernet drivers. Do | |
232 | * not call this function from new drivers. | |
233 | */ | |
234 | struct phy_device *of_phy_connect_fixed_link(struct net_device *dev, | |
235 | void (*hndlr)(struct net_device *), | |
236 | phy_interface_t iface) | |
237 | { | |
238 | struct device_node *net_np; | |
239 | char bus_id[MII_BUS_ID_SIZE + 3]; | |
240 | struct phy_device *phy; | |
33714881 | 241 | const __be32 *phy_id; |
24c30dbb AV |
242 | int sz; |
243 | ||
244 | if (!dev->dev.parent) | |
245 | return NULL; | |
246 | ||
61c7a080 | 247 | net_np = dev->dev.parent->of_node; |
24c30dbb AV |
248 | if (!net_np) |
249 | return NULL; | |
250 | ||
251 | phy_id = of_get_property(net_np, "fixed-link", &sz); | |
252 | if (!phy_id || sz < sizeof(*phy_id)) | |
253 | return NULL; | |
254 | ||
e5c7d1f6 | 255 | sprintf(bus_id, PHY_ID_FMT, "fixed-0", be32_to_cpu(phy_id[0])); |
24c30dbb | 256 | |
f9a8f83b | 257 | phy = phy_connect(dev, bus_id, hndlr, iface); |
24c30dbb AV |
258 | return IS_ERR(phy) ? NULL : phy; |
259 | } | |
260 | EXPORT_SYMBOL(of_phy_connect_fixed_link); | |
7614aba6 AF |
261 | |
262 | /** | |
263 | * of_phy_attach - Attach to a PHY without starting the state machine | |
264 | * @dev: pointer to net_device claiming the phy | |
265 | * @phy_np: Node pointer for the PHY | |
266 | * @flags: flags to pass to the PHY | |
267 | * @iface: PHY data interface type | |
268 | */ | |
269 | struct phy_device *of_phy_attach(struct net_device *dev, | |
270 | struct device_node *phy_np, u32 flags, | |
271 | phy_interface_t iface) | |
272 | { | |
273 | struct phy_device *phy = of_phy_find_device(phy_np); | |
274 | ||
275 | if (!phy) | |
276 | return NULL; | |
277 | ||
278 | return phy_attach_direct(dev, phy, flags, iface) ? NULL : phy; | |
279 | } | |
280 | EXPORT_SYMBOL(of_phy_attach); |