11f89d2feSSander Vanheule // SPDX-License-Identifier: GPL-2.0
21f89d2feSSander Vanheule
31f89d2feSSander Vanheule #include <linux/errno.h>
41f89d2feSSander Vanheule #include <linux/mdio.h>
51f89d2feSSander Vanheule #include <linux/module.h>
61f89d2feSSander Vanheule #include <linux/regmap.h>
71f89d2feSSander Vanheule
8dff404deSSander Vanheule #define REGVAL_MASK GENMASK(15, 0)
9dff404deSSander Vanheule #define REGNUM_C22_MASK GENMASK(4, 0)
10f083be9dSSander Vanheule /* Clause-45 mask includes the device type (5 bit) and actual register number (16 bit) */
11f083be9dSSander Vanheule #define REGNUM_C45_MASK GENMASK(20, 0)
12dff404deSSander Vanheule
regmap_mdio_c22_read(void * context,unsigned int reg,unsigned int * val)137b3c4c37SAndrew Lunn static int regmap_mdio_c22_read(void *context, unsigned int reg, unsigned int *val)
141f89d2feSSander Vanheule {
157b3c4c37SAndrew Lunn struct mdio_device *mdio_dev = context;
161f89d2feSSander Vanheule int ret;
171f89d2feSSander Vanheule
187b3c4c37SAndrew Lunn if (unlikely(reg & ~REGNUM_C22_MASK))
197b3c4c37SAndrew Lunn return -ENXIO;
207b3c4c37SAndrew Lunn
2165aa371eSSean Anderson ret = mdiodev_read(mdio_dev, reg);
22e56360d6SAndy Shevchenko if (ret < 0)
23e56360d6SAndy Shevchenko return ret;
241f89d2feSSander Vanheule
25dff404deSSander Vanheule *val = ret & REGVAL_MASK;
267b3c4c37SAndrew Lunn
27e56360d6SAndy Shevchenko return 0;
281f89d2feSSander Vanheule }
291f89d2feSSander Vanheule
regmap_mdio_c22_write(void * context,unsigned int reg,unsigned int val)30f083be9dSSander Vanheule static int regmap_mdio_c22_write(void *context, unsigned int reg, unsigned int val)
31f083be9dSSander Vanheule {
32f083be9dSSander Vanheule struct mdio_device *mdio_dev = context;
33f083be9dSSander Vanheule
340df02409SSander Vanheule if (unlikely(reg & ~REGNUM_C22_MASK))
350df02409SSander Vanheule return -ENXIO;
360df02409SSander Vanheule
3765aa371eSSean Anderson return mdiodev_write(mdio_dev, reg, val);
38f083be9dSSander Vanheule }
39f083be9dSSander Vanheule
40f083be9dSSander Vanheule static const struct regmap_bus regmap_mdio_c22_bus = {
41f083be9dSSander Vanheule .reg_write = regmap_mdio_c22_write,
42f083be9dSSander Vanheule .reg_read = regmap_mdio_c22_read,
43f083be9dSSander Vanheule };
44f083be9dSSander Vanheule
regmap_mdio_c45_read(void * context,unsigned int reg,unsigned int * val)45f083be9dSSander Vanheule static int regmap_mdio_c45_read(void *context, unsigned int reg, unsigned int *val)
46f083be9dSSander Vanheule {
47f083be9dSSander Vanheule struct mdio_device *mdio_dev = context;
487b3c4c37SAndrew Lunn unsigned int devad;
497b3c4c37SAndrew Lunn int ret;
50f083be9dSSander Vanheule
510df02409SSander Vanheule if (unlikely(reg & ~REGNUM_C45_MASK))
520df02409SSander Vanheule return -ENXIO;
530df02409SSander Vanheule
547b3c4c37SAndrew Lunn devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT;
557b3c4c37SAndrew Lunn reg = reg & REGMAP_MDIO_C45_REGNUM_MASK;
567b3c4c37SAndrew Lunn
577b3c4c37SAndrew Lunn ret = mdiodev_c45_read(mdio_dev, devad, reg);
587b3c4c37SAndrew Lunn if (ret < 0)
597b3c4c37SAndrew Lunn return ret;
607b3c4c37SAndrew Lunn
617b3c4c37SAndrew Lunn *val = ret & REGVAL_MASK;
627b3c4c37SAndrew Lunn
637b3c4c37SAndrew Lunn return 0;
64f083be9dSSander Vanheule }
65f083be9dSSander Vanheule
regmap_mdio_c45_write(void * context,unsigned int reg,unsigned int val)66f083be9dSSander Vanheule static int regmap_mdio_c45_write(void *context, unsigned int reg, unsigned int val)
67f083be9dSSander Vanheule {
68f083be9dSSander Vanheule struct mdio_device *mdio_dev = context;
697b3c4c37SAndrew Lunn unsigned int devad;
70f083be9dSSander Vanheule
710df02409SSander Vanheule if (unlikely(reg & ~REGNUM_C45_MASK))
720df02409SSander Vanheule return -ENXIO;
730df02409SSander Vanheule
747b3c4c37SAndrew Lunn devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT;
757b3c4c37SAndrew Lunn reg = reg & REGMAP_MDIO_C45_REGNUM_MASK;
767b3c4c37SAndrew Lunn
777b3c4c37SAndrew Lunn return mdiodev_c45_write(mdio_dev, devad, reg, val);
78f083be9dSSander Vanheule }
79f083be9dSSander Vanheule
80f083be9dSSander Vanheule static const struct regmap_bus regmap_mdio_c45_bus = {
81f083be9dSSander Vanheule .reg_write = regmap_mdio_c45_write,
82f083be9dSSander Vanheule .reg_read = regmap_mdio_c45_read,
831f89d2feSSander Vanheule };
841f89d2feSSander Vanheule
__regmap_init_mdio(struct mdio_device * mdio_dev,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)851f89d2feSSander Vanheule struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev,
861f89d2feSSander Vanheule const struct regmap_config *config, struct lock_class_key *lock_key,
871f89d2feSSander Vanheule const char *lock_name)
881f89d2feSSander Vanheule {
89ce62df22SSander Vanheule const struct regmap_bus *bus;
90f083be9dSSander Vanheule
91f083be9dSSander Vanheule if (config->reg_bits == 5 && config->val_bits == 16)
92f083be9dSSander Vanheule bus = ®map_mdio_c22_bus;
93f083be9dSSander Vanheule else if (config->reg_bits == 21 && config->val_bits == 16)
94f083be9dSSander Vanheule bus = ®map_mdio_c45_bus;
95f083be9dSSander Vanheule else
961f89d2feSSander Vanheule return ERR_PTR(-EOPNOTSUPP);
971f89d2feSSander Vanheule
98f083be9dSSander Vanheule return __regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name);
991f89d2feSSander Vanheule }
1001f89d2feSSander Vanheule EXPORT_SYMBOL_GPL(__regmap_init_mdio);
1011f89d2feSSander Vanheule
__devm_regmap_init_mdio(struct mdio_device * mdio_dev,const struct regmap_config * config,struct lock_class_key * lock_key,const char * lock_name)1021f89d2feSSander Vanheule struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev,
1031f89d2feSSander Vanheule const struct regmap_config *config, struct lock_class_key *lock_key,
1041f89d2feSSander Vanheule const char *lock_name)
1051f89d2feSSander Vanheule {
106f083be9dSSander Vanheule const struct regmap_bus *bus;
107f083be9dSSander Vanheule
108f083be9dSSander Vanheule if (config->reg_bits == 5 && config->val_bits == 16)
109f083be9dSSander Vanheule bus = ®map_mdio_c22_bus;
110f083be9dSSander Vanheule else if (config->reg_bits == 21 && config->val_bits == 16)
111f083be9dSSander Vanheule bus = ®map_mdio_c45_bus;
112f083be9dSSander Vanheule else
1131f89d2feSSander Vanheule return ERR_PTR(-EOPNOTSUPP);
1141f89d2feSSander Vanheule
115f083be9dSSander Vanheule return __devm_regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name);
1161f89d2feSSander Vanheule }
1171f89d2feSSander Vanheule EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio);
1181f89d2feSSander Vanheule
1191f89d2feSSander Vanheule MODULE_AUTHOR("Sander Vanheule <sander@svanheule.net>");
120*c1ffff88SAndy Shevchenko MODULE_DESCRIPTION("regmap MDIO Module");
1211f89d2feSSander Vanheule MODULE_LICENSE("GPL v2");
122