From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/base/regmap/regmap-mdio.c | 121 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 drivers/base/regmap/regmap-mdio.c (limited to 'drivers/base/regmap/regmap-mdio.c') diff --git a/drivers/base/regmap/regmap-mdio.c b/drivers/base/regmap/regmap-mdio.c new file mode 100644 index 0000000000..6aa6a24094 --- /dev/null +++ b/drivers/base/regmap/regmap-mdio.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include + +#define REGVAL_MASK GENMASK(15, 0) +#define REGNUM_C22_MASK GENMASK(4, 0) +/* Clause-45 mask includes the device type (5 bit) and actual register number (16 bit) */ +#define REGNUM_C45_MASK GENMASK(20, 0) + +static int regmap_mdio_c22_read(void *context, unsigned int reg, unsigned int *val) +{ + struct mdio_device *mdio_dev = context; + int ret; + + if (unlikely(reg & ~REGNUM_C22_MASK)) + return -ENXIO; + + ret = mdiodev_read(mdio_dev, reg); + if (ret < 0) + return ret; + + *val = ret & REGVAL_MASK; + + return 0; +} + +static int regmap_mdio_c22_write(void *context, unsigned int reg, unsigned int val) +{ + struct mdio_device *mdio_dev = context; + + if (unlikely(reg & ~REGNUM_C22_MASK)) + return -ENXIO; + + return mdiodev_write(mdio_dev, reg, val); +} + +static const struct regmap_bus regmap_mdio_c22_bus = { + .reg_write = regmap_mdio_c22_write, + .reg_read = regmap_mdio_c22_read, +}; + +static int regmap_mdio_c45_read(void *context, unsigned int reg, unsigned int *val) +{ + struct mdio_device *mdio_dev = context; + unsigned int devad; + int ret; + + if (unlikely(reg & ~REGNUM_C45_MASK)) + return -ENXIO; + + devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT; + reg = reg & REGMAP_MDIO_C45_REGNUM_MASK; + + ret = mdiodev_c45_read(mdio_dev, devad, reg); + if (ret < 0) + return ret; + + *val = ret & REGVAL_MASK; + + return 0; +} + +static int regmap_mdio_c45_write(void *context, unsigned int reg, unsigned int val) +{ + struct mdio_device *mdio_dev = context; + unsigned int devad; + + if (unlikely(reg & ~REGNUM_C45_MASK)) + return -ENXIO; + + devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT; + reg = reg & REGMAP_MDIO_C45_REGNUM_MASK; + + return mdiodev_c45_write(mdio_dev, devad, reg, val); +} + +static const struct regmap_bus regmap_mdio_c45_bus = { + .reg_write = regmap_mdio_c45_write, + .reg_read = regmap_mdio_c45_read, +}; + +struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev, + const struct regmap_config *config, struct lock_class_key *lock_key, + const char *lock_name) +{ + const struct regmap_bus *bus; + + if (config->reg_bits == 5 && config->val_bits == 16) + bus = ®map_mdio_c22_bus; + else if (config->reg_bits == 21 && config->val_bits == 16) + bus = ®map_mdio_c45_bus; + else + return ERR_PTR(-EOPNOTSUPP); + + return __regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__regmap_init_mdio); + +struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev, + const struct regmap_config *config, struct lock_class_key *lock_key, + const char *lock_name) +{ + const struct regmap_bus *bus; + + if (config->reg_bits == 5 && config->val_bits == 16) + bus = ®map_mdio_c22_bus; + else if (config->reg_bits == 21 && config->val_bits == 16) + bus = ®map_mdio_c45_bus; + else + return ERR_PTR(-EOPNOTSUPP); + + return __devm_regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio); + +MODULE_AUTHOR("Sander Vanheule "); +MODULE_DESCRIPTION("Regmap MDIO Module"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3