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
regmap_mdio_c22_read(void * context,unsigned int reg,unsigned int * val)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(mdio_dev, reg);
22 if (ret < 0)
23 return ret;
24
25 *val = ret & REGVAL_MASK;
26
27 return 0;
28 }
29
regmap_mdio_c22_write(void * context,unsigned int reg,unsigned int val)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(mdio_dev, 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
regmap_mdio_c45_read(void * context,unsigned int reg,unsigned int * val)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(mdio_dev, devad, reg);
58 if (ret < 0)
59 return ret;
60
61 *val = ret & REGVAL_MASK;
62
63 return 0;
64 }
65
regmap_mdio_c45_write(void * context,unsigned int reg,unsigned int val)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(mdio_dev, devad, 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
__regmap_init_mdio(struct mdio_device * mdio_dev,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)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(-EOPNOTSUPP);
97
98 return __regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name);
99 }
100 EXPORT_SYMBOL_GPL(__regmap_init_mdio);
101
__devm_regmap_init_mdio(struct mdio_device * mdio_dev,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)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(-EOPNOTSUPP);
114
115 return __devm_regmap_init(&mdio_dev->dev, bus, 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
