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(mdio_dev, 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(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 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 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 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); 101 102 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