1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/errno.h>
4#include <linux/mdio.h>
5#include <linux/module.h>
6#include <linux/regmap.h>
7
8#define REGVAL_MASK GENMASK(15, 0)
9#define REGNUM_C22_MASK GENMASK(4, 0)
10/* Clause-45 mask includes the device type (5 bit) and actual register number (16 bit) */
11#define REGNUM_C45_MASK GENMASK(20, 0)
12
13static int regmap_mdio_c22_read(void *context, unsigned int reg, unsigned int *val)
14{
15 struct mdio_device *mdio_dev = context;
16 int ret;
17
18 if (unlikely(reg & ~REGNUM_C22_MASK))
19 return -ENXIO;
20
21 ret = mdiodev_read(mdiodev: mdio_dev, regnum: reg);
22 if (ret < 0)
23 return ret;
24
25 *val = ret & REGVAL_MASK;
26
27 return 0;
28}
29
30static int regmap_mdio_c22_write(void *context, unsigned int reg, unsigned int val)
31{
32 struct mdio_device *mdio_dev = context;
33
34 if (unlikely(reg & ~REGNUM_C22_MASK))
35 return -ENXIO;
36
37 return mdiodev_write(mdiodev: mdio_dev, regnum: reg, val);
38}
39
40static const struct regmap_bus regmap_mdio_c22_bus = {
41 .reg_write = regmap_mdio_c22_write,
42 .reg_read = regmap_mdio_c22_read,
43};
44
45static int regmap_mdio_c45_read(void *context, unsigned int reg, unsigned int *val)
46{
47 struct mdio_device *mdio_dev = context;
48 unsigned int devad;
49 int ret;
50
51 if (unlikely(reg & ~REGNUM_C45_MASK))
52 return -ENXIO;
53
54 devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT;
55 reg = reg & REGMAP_MDIO_C45_REGNUM_MASK;
56
57 ret = mdiodev_c45_read(mdiodev: mdio_dev, devad, regnum: reg);
58 if (ret < 0)
59 return ret;
60
61 *val = ret & REGVAL_MASK;
62
63 return 0;
64}
65
66static int regmap_mdio_c45_write(void *context, unsigned int reg, unsigned int val)
67{
68 struct mdio_device *mdio_dev = context;
69 unsigned int devad;
70
71 if (unlikely(reg & ~REGNUM_C45_MASK))
72 return -ENXIO;
73
74 devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT;
75 reg = reg & REGMAP_MDIO_C45_REGNUM_MASK;
76
77 return mdiodev_c45_write(mdiodev: mdio_dev, devad, regnum: reg, val);
78}
79
80static const struct regmap_bus regmap_mdio_c45_bus = {
81 .reg_write = regmap_mdio_c45_write,
82 .reg_read = regmap_mdio_c45_read,
83};
84
85struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev,
86 const struct regmap_config *config, struct lock_class_key *lock_key,
87 const char *lock_name)
88{
89 const struct regmap_bus *bus;
90
91 if (config->reg_bits == 5 && config->val_bits == 16)
92 bus = &regmap_mdio_c22_bus;
93 else if (config->reg_bits == 21 && config->val_bits == 16)
94 bus = &regmap_mdio_c45_bus;
95 else
96 return ERR_PTR(error: -EOPNOTSUPP);
97
98 return __regmap_init(dev: &mdio_dev->dev, bus, bus_context: mdio_dev, config, lock_key, lock_name);
99}
100EXPORT_SYMBOL_GPL(__regmap_init_mdio);
101
102struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev,
103 const struct regmap_config *config, struct lock_class_key *lock_key,
104 const char *lock_name)
105{
106 const struct regmap_bus *bus;
107
108 if (config->reg_bits == 5 && config->val_bits == 16)
109 bus = &regmap_mdio_c22_bus;
110 else if (config->reg_bits == 21 && config->val_bits == 16)
111 bus = &regmap_mdio_c45_bus;
112 else
113 return ERR_PTR(error: -EOPNOTSUPP);
114
115 return __devm_regmap_init(dev: &mdio_dev->dev, bus, bus_context: mdio_dev, config, lock_key, lock_name);
116}
117EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio);
118
119MODULE_AUTHOR("Sander Vanheule <sander@svanheule.net>");
120MODULE_DESCRIPTION("regmap MDIO Module");
121MODULE_LICENSE("GPL v2");
122

source code of linux/drivers/base/regmap/regmap-mdio.c