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 | |
13 | static 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 | |
30 | static 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 | |
40 | static const struct regmap_bus regmap_mdio_c22_bus = { |
41 | .reg_write = regmap_mdio_c22_write, |
42 | .reg_read = regmap_mdio_c22_read, |
43 | }; |
44 | |
45 | static 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 | |
66 | static 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 | |
80 | static const struct regmap_bus regmap_mdio_c45_bus = { |
81 | .reg_write = regmap_mdio_c45_write, |
82 | .reg_read = regmap_mdio_c45_read, |
83 | }; |
84 | |
85 | struct 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 = ®map_mdio_c22_bus; |
93 | else if (config->reg_bits == 21 && config->val_bits == 16) |
94 | bus = ®map_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 | } |
100 | EXPORT_SYMBOL_GPL(__regmap_init_mdio); |
101 | |
102 | struct 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 = ®map_mdio_c22_bus; |
110 | else if (config->reg_bits == 21 && config->val_bits == 16) |
111 | bus = ®map_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 | } |
117 | EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio); |
118 | |
119 | MODULE_AUTHOR("Sander Vanheule <sander@svanheule.net>" ); |
120 | MODULE_DESCRIPTION("Regmap MDIO Module" ); |
121 | MODULE_LICENSE("GPL v2" ); |
122 | |