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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 gpio_desc;
16struct mii_bus;
17
18/* Multiple levels of nesting are possible. However typically this is
19 * limited to nested DSA like layer, a MUX layer, and the normal
20 * user. Instead of trying to handle the general case, just define
21 * these cases.
22 */
23enum mdio_mutex_lock_class {
24 MDIO_MUTEX_NORMAL,
25 MDIO_MUTEX_MUX,
26 MDIO_MUTEX_NESTED,
27};
28
29struct mdio_device {
30 struct device dev;
31
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 struct gpio_desc *reset;
43 unsigned int reset_assert_delay;
44 unsigned int reset_deassert_delay;
45};
46#define to_mdio_device(d) container_of(d, struct mdio_device, dev)
47
48/* struct mdio_driver_common: Common to all MDIO drivers */
49struct mdio_driver_common {
50 struct device_driver driver;
51 int flags;
52};
53#define MDIO_DEVICE_FLAG_PHY 1
54#define to_mdio_common_driver(d) \
55 container_of(d, struct mdio_driver_common, driver)
56
57/* struct mdio_driver: Generic MDIO driver */
58struct mdio_driver {
59 struct mdio_driver_common mdiodrv;
60
61 /*
62 * Called during discovery. Used to set
63 * up device-specific structures, if any
64 */
65 int (*probe)(struct mdio_device *mdiodev);
66
67 /* Clears up any memory if needed */
68 void (*remove)(struct mdio_device *mdiodev);
69};
70#define to_mdio_driver(d) \
71 container_of(to_mdio_common_driver(d), struct mdio_driver, mdiodrv)
72
73void mdio_device_free(struct mdio_device *mdiodev);
74struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr);
75int mdio_device_register(struct mdio_device *mdiodev);
76void mdio_device_remove(struct mdio_device *mdiodev);
77void mdio_device_reset(struct mdio_device *mdiodev, int value);
78int mdio_driver_register(struct mdio_driver *drv);
79void mdio_driver_unregister(struct mdio_driver *drv);
80int mdio_device_bus_match(struct device *dev, struct device_driver *drv);
81
82static inline bool mdio_phy_id_is_c45(int phy_id)
83{
84 return (phy_id & MDIO_PHY_ID_C45) && !(phy_id & ~MDIO_PHY_ID_C45_MASK);
85}
86
87static inline __u16 mdio_phy_id_prtad(int phy_id)
88{
89 return (phy_id & MDIO_PHY_ID_PRTAD) >> 5;
90}
91
92static inline __u16 mdio_phy_id_devad(int phy_id)
93{
94 return phy_id & MDIO_PHY_ID_DEVAD;
95}
96
97/**
98 * struct mdio_if_info - Ethernet controller MDIO interface
99 * @prtad: PRTAD of the PHY (%MDIO_PRTAD_NONE if not present/unknown)
100 * @mmds: Mask of MMDs expected to be present in the PHY. This must be
101 * non-zero unless @prtad = %MDIO_PRTAD_NONE.
102 * @mode_support: MDIO modes supported. If %MDIO_SUPPORTS_C22 is set then
103 * MII register access will be passed through with @devad =
104 * %MDIO_DEVAD_NONE. If %MDIO_EMULATE_C22 is set then access to
105 * commonly used clause 22 registers will be translated into
106 * clause 45 registers.
107 * @dev: Net device structure
108 * @mdio_read: Register read function; returns value or negative error code
109 * @mdio_write: Register write function; returns 0 or negative error code
110 */
111struct mdio_if_info {
112 int prtad;
113 u32 mmds;
114 unsigned mode_support;
115
116 struct net_device *dev;
117 int (*mdio_read)(struct net_device *dev, int prtad, int devad,
118 u16 addr);
119 int (*mdio_write)(struct net_device *dev, int prtad, int devad,
120 u16 addr, u16 val);
121};
122
123#define MDIO_PRTAD_NONE (-1)
124#define MDIO_DEVAD_NONE (-1)
125#define MDIO_SUPPORTS_C22 1
126#define MDIO_SUPPORTS_C45 2
127#define MDIO_EMULATE_C22 4
128
129struct ethtool_cmd;
130struct ethtool_pauseparam;
131extern int mdio45_probe(struct mdio_if_info *mdio, int prtad);
132extern int mdio_set_flag(const struct mdio_if_info *mdio,
133 int prtad, int devad, u16 addr, int mask,
134 bool sense);
135extern int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmds);
136extern int mdio45_nway_restart(const struct mdio_if_info *mdio);
137extern void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
138 struct ethtool_cmd *ecmd,
139 u32 npage_adv, u32 npage_lpa);
140extern void
141mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
142 struct ethtool_link_ksettings *cmd,
143 u32 npage_adv, u32 npage_lpa);
144
145/**
146 * mdio45_ethtool_gset - get settings for ETHTOOL_GSET
147 * @mdio: MDIO interface
148 * @ecmd: Ethtool request structure
149 *
150 * Since the CSRs for auto-negotiation using next pages are not fully
151 * standardised, this function does not attempt to decode them. Use
152 * mdio45_ethtool_gset_npage() to specify advertisement bits from next
153 * pages.
154 */
155static inline void mdio45_ethtool_gset(const struct mdio_if_info *mdio,
156 struct ethtool_cmd *ecmd)
157{
158 mdio45_ethtool_gset_npage(mdio, ecmd, 0, 0);
159}
160
161/**
162 * mdio45_ethtool_ksettings_get - get settings for ETHTOOL_GLINKSETTINGS
163 * @mdio: MDIO interface
164 * @cmd: Ethtool request structure
165 *
166 * Since the CSRs for auto-negotiation using next pages are not fully
167 * standardised, this function does not attempt to decode them. Use
168 * mdio45_ethtool_ksettings_get_npage() to specify advertisement bits
169 * from next pages.
170 */
171static inline void
172mdio45_ethtool_ksettings_get(const struct mdio_if_info *mdio,
173 struct ethtool_link_ksettings *cmd)
174{
175 mdio45_ethtool_ksettings_get_npage(mdio, cmd, 0, 0);
176}
177
178extern int mdio_mii_ioctl(const struct mdio_if_info *mdio,
179 struct mii_ioctl_data *mii_data, int cmd);
180
181/**
182 * mmd_eee_cap_to_ethtool_sup_t
183 * @eee_cap: value of the MMD EEE Capability register
184 *
185 * A small helper function that translates MMD EEE Capability (3.20) bits
186 * to ethtool supported settings.
187 */
188static inline u32 mmd_eee_cap_to_ethtool_sup_t(u16 eee_cap)
189{
190 u32 supported = 0;
191
192 if (eee_cap & MDIO_EEE_100TX)
193 supported |= SUPPORTED_100baseT_Full;
194 if (eee_cap & MDIO_EEE_1000T)
195 supported |= SUPPORTED_1000baseT_Full;
196 if (eee_cap & MDIO_EEE_10GT)
197 supported |= SUPPORTED_10000baseT_Full;
198 if (eee_cap & MDIO_EEE_1000KX)
199 supported |= SUPPORTED_1000baseKX_Full;
200 if (eee_cap & MDIO_EEE_10GKX4)
201 supported |= SUPPORTED_10000baseKX4_Full;
202 if (eee_cap & MDIO_EEE_10GKR)
203 supported |= SUPPORTED_10000baseKR_Full;
204
205 return supported;
206}
207
208/**
209 * mmd_eee_adv_to_ethtool_adv_t
210 * @eee_adv: value of the MMD EEE Advertisement/Link Partner Ability registers
211 *
212 * A small helper function that translates the MMD EEE Advertisment (7.60)
213 * and MMD EEE Link Partner Ability (7.61) bits to ethtool advertisement
214 * settings.
215 */
216static inline u32 mmd_eee_adv_to_ethtool_adv_t(u16 eee_adv)
217{
218 u32 adv = 0;
219
220 if (eee_adv & MDIO_EEE_100TX)
221 adv |= ADVERTISED_100baseT_Full;
222 if (eee_adv & MDIO_EEE_1000T)
223 adv |= ADVERTISED_1000baseT_Full;
224 if (eee_adv & MDIO_EEE_10GT)
225 adv |= ADVERTISED_10000baseT_Full;
226 if (eee_adv & MDIO_EEE_1000KX)
227 adv |= ADVERTISED_1000baseKX_Full;
228 if (eee_adv & MDIO_EEE_10GKX4)
229 adv |= ADVERTISED_10000baseKX4_Full;
230 if (eee_adv & MDIO_EEE_10GKR)
231 adv |= ADVERTISED_10000baseKR_Full;
232
233 return adv;
234}
235
236/**
237 * ethtool_adv_to_mmd_eee_adv_t
238 * @adv: the ethtool advertisement settings
239 *
240 * A small helper function that translates ethtool advertisement settings
241 * to EEE advertisements for the MMD EEE Advertisement (7.60) and
242 * MMD EEE Link Partner Ability (7.61) registers.
243 */
244static inline u16 ethtool_adv_to_mmd_eee_adv_t(u32 adv)
245{
246 u16 reg = 0;
247
248 if (adv & ADVERTISED_100baseT_Full)
249 reg |= MDIO_EEE_100TX;
250 if (adv & ADVERTISED_1000baseT_Full)
251 reg |= MDIO_EEE_1000T;
252 if (adv & ADVERTISED_10000baseT_Full)
253 reg |= MDIO_EEE_10GT;
254 if (adv & ADVERTISED_1000baseKX_Full)
255 reg |= MDIO_EEE_1000KX;
256 if (adv & ADVERTISED_10000baseKX4_Full)
257 reg |= MDIO_EEE_10GKX4;
258 if (adv & ADVERTISED_10000baseKR_Full)
259 reg |= MDIO_EEE_10GKR;
260
261 return reg;
262}
263
264int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
265int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
266
267int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
268int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum);
269int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
270int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val);
271
272int mdiobus_register_device(struct mdio_device *mdiodev);
273int mdiobus_unregister_device(struct mdio_device *mdiodev);
274bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
275struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr);
276
277/**
278 * mdio_module_driver() - Helper macro for registering mdio drivers
279 *
280 * Helper macro for MDIO drivers which do not do anything special in module
281 * init/exit. Each module may only use this macro once, and calling it
282 * replaces module_init() and module_exit().
283 */
284#define mdio_module_driver(_mdio_driver) \
285static int __init mdio_module_init(void) \
286{ \
287 return mdio_driver_register(&_mdio_driver); \
288} \
289module_init(mdio_module_init); \
290static void __exit mdio_module_exit(void) \
291{ \
292 mdio_driver_unregister(&_mdio_driver); \
293} \
294module_exit(mdio_module_exit)
295
296#endif /* __LINUX_MDIO_H__ */