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1/*
2 * linux/mdio.h: definitions for MDIO (clause 45) transceivers
3 * Copyright 2006-2009 Solarflare Communications Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation, incorporated herein by reference.
8 */
9#ifndef __LINUX_MDIO_H__
10#define __LINUX_MDIO_H__
11
12#include <uapi/linux/mdio.h>
13#include <linux/mod_devicetable.h>
14
15struct mii_bus;
16
17/* Multiple levels of nesting are possible. However typically this is
18 * limited to nested DSA like layer, a MUX layer, and the normal
19 * user. Instead of trying to handle the general case, just define
20 * these cases.
21 */
22enum mdio_mutex_lock_class {
23 MDIO_MUTEX_NORMAL,
24 MDIO_MUTEX_MUX,
25 MDIO_MUTEX_NESTED,
26};
27
28struct mdio_device {
29 struct device dev;
30
31 const struct dev_pm_ops *pm_ops;
32 struct mii_bus *bus;
33 char modalias[MDIO_NAME_SIZE];
34
35 int (*bus_match)(struct device *dev, struct device_driver *drv);
36 void (*device_free)(struct mdio_device *mdiodev);
37 void (*device_remove)(struct mdio_device *mdiodev);
38
39 /* Bus address of the MDIO device (0-31) */
40 int addr;
41 int flags;
42};
43#define to_mdio_device(d) container_of(d, struct mdio_device, dev)
44
45/* struct mdio_driver_common: Common to all MDIO drivers */
46struct mdio_driver_common {
47 struct device_driver driver;
48 int flags;
49};
50#define MDIO_DEVICE_FLAG_PHY 1
51#define to_mdio_common_driver(d) \
52 container_of(d, struct mdio_driver_common, driver)
53
54/* struct mdio_driver: Generic MDIO driver */
55struct mdio_driver {
56 struct mdio_driver_common mdiodrv;
57
58 /*
59 * Called during discovery. Used to set
60 * up device-specific structures, if any
61 */
62 int (*probe)(struct mdio_device *mdiodev);
63
64 /* Clears up any memory if needed */
65 void (*remove)(struct mdio_device *mdiodev);
66};
67#define to_mdio_driver(d) \
68 container_of(to_mdio_common_driver(d), struct mdio_driver, mdiodrv)
69
70void mdio_device_free(struct mdio_device *mdiodev);
71struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr);
72int mdio_device_register(struct mdio_device *mdiodev);
73void mdio_device_remove(struct mdio_device *mdiodev);
74int mdio_driver_register(struct mdio_driver *drv);
75void mdio_driver_unregister(struct mdio_driver *drv);
76int mdio_device_bus_match(struct device *dev, struct device_driver *drv);
77
78static inline bool mdio_phy_id_is_c45(int phy_id)
79{
80 return (phy_id & MDIO_PHY_ID_C45) && !(phy_id & ~MDIO_PHY_ID_C45_MASK);
81}
82
83static inline __u16 mdio_phy_id_prtad(int phy_id)
84{
85 return (phy_id & MDIO_PHY_ID_PRTAD) >> 5;
86}
87
88static inline __u16 mdio_phy_id_devad(int phy_id)
89{
90 return phy_id & MDIO_PHY_ID_DEVAD;
91}
92
93/**
94 * struct mdio_if_info - Ethernet controller MDIO interface
95 * @prtad: PRTAD of the PHY (%MDIO_PRTAD_NONE if not present/unknown)
96 * @mmds: Mask of MMDs expected to be present in the PHY. This must be
97 * non-zero unless @prtad = %MDIO_PRTAD_NONE.
98 * @mode_support: MDIO modes supported. If %MDIO_SUPPORTS_C22 is set then
99 * MII register access will be passed through with @devad =
100 * %MDIO_DEVAD_NONE. If %MDIO_EMULATE_C22 is set then access to
101 * commonly used clause 22 registers will be translated into
102 * clause 45 registers.
103 * @dev: Net device structure
104 * @mdio_read: Register read function; returns value or negative error code
105 * @mdio_write: Register write function; returns 0 or negative error code
106 */
107struct mdio_if_info {
108 int prtad;
109 u32 mmds;
110 unsigned mode_support;
111
112 struct net_device *dev;
113 int (*mdio_read)(struct net_device *dev, int prtad, int devad,
114 u16 addr);
115 int (*mdio_write)(struct net_device *dev, int prtad, int devad,
116 u16 addr, u16 val);
117};
118
119#define MDIO_PRTAD_NONE (-1)
120#define MDIO_DEVAD_NONE (-1)
121#define MDIO_SUPPORTS_C22 1
122#define MDIO_SUPPORTS_C45 2
123#define MDIO_EMULATE_C22 4
124
125struct ethtool_cmd;
126struct ethtool_pauseparam;
127extern int mdio45_probe(struct mdio_if_info *mdio, int prtad);
128extern int mdio_set_flag(const struct mdio_if_info *mdio,
129 int prtad, int devad, u16 addr, int mask,
130 bool sense);
131extern int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmds);
132extern int mdio45_nway_restart(const struct mdio_if_info *mdio);
133extern void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
134 struct ethtool_cmd *ecmd,
135 u32 npage_adv, u32 npage_lpa);
136extern void
137mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
138 struct ethtool_link_ksettings *cmd,
139 u32 npage_adv, u32 npage_lpa);
140
141/**
142 * mdio45_ethtool_gset - get settings for ETHTOOL_GSET
143 * @mdio: MDIO interface
144 * @ecmd: Ethtool request structure
145 *
146 * Since the CSRs for auto-negotiation using next pages are not fully
147 * standardised, this function does not attempt to decode them. Use
148 * mdio45_ethtool_gset_npage() to specify advertisement bits from next
149 * pages.
150 */
151static inline void mdio45_ethtool_gset(const struct mdio_if_info *mdio,
152 struct ethtool_cmd *ecmd)
153{
154 mdio45_ethtool_gset_npage(mdio, ecmd, 0, 0);
155}
156
157/**
158 * mdio45_ethtool_ksettings_get - get settings for ETHTOOL_GLINKSETTINGS
159 * @mdio: MDIO interface
160 * @cmd: Ethtool request structure
161 *
162 * Since the CSRs for auto-negotiation using next pages are not fully
163 * standardised, this function does not attempt to decode them. Use
164 * mdio45_ethtool_ksettings_get_npage() to specify advertisement bits
165 * from next pages.
166 */
167static inline void
168mdio45_ethtool_ksettings_get(const struct mdio_if_info *mdio,
169 struct ethtool_link_ksettings *cmd)
170{
171 mdio45_ethtool_ksettings_get_npage(mdio, cmd, 0, 0);
172}
173
174extern int mdio_mii_ioctl(const struct mdio_if_info *mdio,
175 struct mii_ioctl_data *mii_data, int cmd);
176
177/**
178 * mmd_eee_cap_to_ethtool_sup_t
179 * @eee_cap: value of the MMD EEE Capability register
180 *
181 * A small helper function that translates MMD EEE Capability (3.20) bits
182 * to ethtool supported settings.
183 */
184static inline u32 mmd_eee_cap_to_ethtool_sup_t(u16 eee_cap)
185{
186 u32 supported = 0;
187
188 if (eee_cap & MDIO_EEE_100TX)
189 supported |= SUPPORTED_100baseT_Full;
190 if (eee_cap & MDIO_EEE_1000T)
191 supported |= SUPPORTED_1000baseT_Full;
192 if (eee_cap & MDIO_EEE_10GT)
193 supported |= SUPPORTED_10000baseT_Full;
194 if (eee_cap & MDIO_EEE_1000KX)
195 supported |= SUPPORTED_1000baseKX_Full;
196 if (eee_cap & MDIO_EEE_10GKX4)
197 supported |= SUPPORTED_10000baseKX4_Full;
198 if (eee_cap & MDIO_EEE_10GKR)
199 supported |= SUPPORTED_10000baseKR_Full;
200
201 return supported;
202}
203
204/**
205 * mmd_eee_adv_to_ethtool_adv_t
206 * @eee_adv: value of the MMD EEE Advertisement/Link Partner Ability registers
207 *
208 * A small helper function that translates the MMD EEE Advertisment (7.60)
209 * and MMD EEE Link Partner Ability (7.61) bits to ethtool advertisement
210 * settings.
211 */
212static inline u32 mmd_eee_adv_to_ethtool_adv_t(u16 eee_adv)
213{
214 u32 adv = 0;
215
216 if (eee_adv & MDIO_EEE_100TX)
217 adv |= ADVERTISED_100baseT_Full;
218 if (eee_adv & MDIO_EEE_1000T)
219 adv |= ADVERTISED_1000baseT_Full;
220 if (eee_adv & MDIO_EEE_10GT)
221 adv |= ADVERTISED_10000baseT_Full;
222 if (eee_adv & MDIO_EEE_1000KX)
223 adv |= ADVERTISED_1000baseKX_Full;
224 if (eee_adv & MDIO_EEE_10GKX4)
225 adv |= ADVERTISED_10000baseKX4_Full;
226 if (eee_adv & MDIO_EEE_10GKR)
227 adv |= ADVERTISED_10000baseKR_Full;
228
229 return adv;
230}
231
232/**
233 * ethtool_adv_to_mmd_eee_adv_t
234 * @adv: the ethtool advertisement settings
235 *
236 * A small helper function that translates ethtool advertisement settings
237 * to EEE advertisements for the MMD EEE Advertisement (7.60) and
238 * MMD EEE Link Partner Ability (7.61) registers.
239 */
240static inline u16 ethtool_adv_to_mmd_eee_adv_t(u32 adv)
241{
242 u16 reg = 0;
243
244 if (adv & ADVERTISED_100baseT_Full)
245 reg |= MDIO_EEE_100TX;
246 if (adv & ADVERTISED_1000baseT_Full)
247 reg |= MDIO_EEE_1000T;
248 if (adv & ADVERTISED_10000baseT_Full)
249 reg |= MDIO_EEE_10GT;
250 if (adv & ADVERTISED_1000baseKX_Full)
251 reg |= MDIO_EEE_1000KX;
252 if (adv & ADVERTISED_10000baseKX4_Full)
253 reg |= MDIO_EEE_10GKX4;
254 if (adv & ADVERTISED_10000baseKR_Full)
255 reg |= MDIO_EEE_10GKR;
256
257 return reg;
258}
259
260int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
261int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum);
262int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
263int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val);
264
265int mdiobus_register_device(struct mdio_device *mdiodev);
266int mdiobus_unregister_device(struct mdio_device *mdiodev);
267bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
268struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr);
269
270/**
271 * mdio_module_driver() - Helper macro for registering mdio drivers
272 *
273 * Helper macro for MDIO drivers which do not do anything special in module
274 * init/exit. Each module may only use this macro once, and calling it
275 * replaces module_init() and module_exit().
276 */
277#define mdio_module_driver(_mdio_driver) \
278static int __init mdio_module_init(void) \
279{ \
280 return mdio_driver_register(&_mdio_driver); \
281} \
282module_init(mdio_module_init); \
283static void __exit mdio_module_exit(void) \
284{ \
285 mdio_driver_unregister(&_mdio_driver); \
286} \
287module_exit(mdio_module_exit)
288
289#endif /* __LINUX_MDIO_H__ */