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_read(struct mdio_device * mdio_dev,u32 reg,unsigned int * val)13 static int regmap_mdio_read(struct mdio_device *mdio_dev, u32 reg, unsigned int *val)
14 {
15 int ret;
16
17 ret = mdiodev_read(mdio_dev, reg);
18 if (ret < 0)
19 return ret;
20
21 *val = ret & REGVAL_MASK;
22 return 0;
23 }
24
regmap_mdio_write(struct mdio_device * mdio_dev,u32 reg,unsigned int val)25 static int regmap_mdio_write(struct mdio_device *mdio_dev, u32 reg, unsigned int val)
26 {
27 return mdiodev_write(mdio_dev, reg, val);
28 }
29
regmap_mdio_c22_read(void * context,unsigned int reg,unsigned int * val)30 static int regmap_mdio_c22_read(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 regmap_mdio_read(mdio_dev, reg, val);
38 }
39
regmap_mdio_c22_write(void * context,unsigned int reg,unsigned int val)40 static int regmap_mdio_c22_write(void *context, unsigned int reg, unsigned int val)
41 {
42 struct mdio_device *mdio_dev = context;
43
44 if (unlikely(reg & ~REGNUM_C22_MASK))
45 return -ENXIO;
46
47 return mdiodev_write(mdio_dev, reg, val);
48 }
49
50 static const struct regmap_bus regmap_mdio_c22_bus = {
51 .reg_write = regmap_mdio_c22_write,
52 .reg_read = regmap_mdio_c22_read,
53 };
54
regmap_mdio_c45_read(void * context,unsigned int reg,unsigned int * val)55 static int regmap_mdio_c45_read(void *context, unsigned int reg, unsigned int *val)
56 {
57 struct mdio_device *mdio_dev = context;
58
59 if (unlikely(reg & ~REGNUM_C45_MASK))
60 return -ENXIO;
61
62 return regmap_mdio_read(mdio_dev, MII_ADDR_C45 | reg, val);
63 }
64
regmap_mdio_c45_write(void * context,unsigned int reg,unsigned int val)65 static int regmap_mdio_c45_write(void *context, unsigned int reg, unsigned int val)
66 {
67 struct mdio_device *mdio_dev = context;
68
69 if (unlikely(reg & ~REGNUM_C45_MASK))
70 return -ENXIO;
71
72 return regmap_mdio_write(mdio_dev, MII_ADDR_C45 | reg, val);
73 }
74
75 static const struct regmap_bus regmap_mdio_c45_bus = {
76 .reg_write = regmap_mdio_c45_write,
77 .reg_read = regmap_mdio_c45_read,
78 };
79
__regmap_init_mdio(struct mdio_device * mdio_dev,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)80 struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev,
81 const struct regmap_config *config, struct lock_class_key *lock_key,
82 const char *lock_name)
83 {
84 const struct regmap_bus *bus;
85
86 if (config->reg_bits == 5 && config->val_bits == 16)
87 bus = ®map_mdio_c22_bus;
88 else if (config->reg_bits == 21 && config->val_bits == 16)
89 bus = ®map_mdio_c45_bus;
90 else
91 return ERR_PTR(-EOPNOTSUPP);
92
93 return __regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name);
94 }
95 EXPORT_SYMBOL_GPL(__regmap_init_mdio);
96
__devm_regmap_init_mdio(struct mdio_device * mdio_dev,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)97 struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev,
98 const struct regmap_config *config, struct lock_class_key *lock_key,
99 const char *lock_name)
100 {
101 const struct regmap_bus *bus;
102
103 if (config->reg_bits == 5 && config->val_bits == 16)
104 bus = ®map_mdio_c22_bus;
105 else if (config->reg_bits == 21 && config->val_bits == 16)
106 bus = ®map_mdio_c45_bus;
107 else
108 return ERR_PTR(-EOPNOTSUPP);
109
110 return __devm_regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name);
111 }
112 EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio);
113
114 MODULE_AUTHOR("Sander Vanheule <sander@svanheule.net>");
115 MODULE_DESCRIPTION("Regmap MDIO Module");
116 MODULE_LICENSE("GPL v2");
117