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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/base/regmap/regmap-mdio.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/base/regmap/regmap-mdio.c')
-rw-r--r-- | drivers/base/regmap/regmap-mdio.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/drivers/base/regmap/regmap-mdio.c b/drivers/base/regmap/regmap-mdio.c new file mode 100644 index 000000000..f7293040a --- /dev/null +++ b/drivers/base/regmap/regmap-mdio.c @@ -0,0 +1,116 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/errno.h> +#include <linux/mdio.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#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_read(struct mdio_device *mdio_dev, u32 reg, unsigned int *val) +{ + int ret; + + ret = mdiodev_read(mdio_dev, reg); + if (ret < 0) + return ret; + + *val = ret & REGVAL_MASK; + return 0; +} + +static int regmap_mdio_write(struct mdio_device *mdio_dev, u32 reg, unsigned int val) +{ + return mdiodev_write(mdio_dev, reg, val); +} + +static int regmap_mdio_c22_read(void *context, unsigned int reg, unsigned int *val) +{ + struct mdio_device *mdio_dev = context; + + if (unlikely(reg & ~REGNUM_C22_MASK)) + return -ENXIO; + + return regmap_mdio_read(mdio_dev, reg, val); +} + +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; + + if (unlikely(reg & ~REGNUM_C45_MASK)) + return -ENXIO; + + return regmap_mdio_read(mdio_dev, MII_ADDR_C45 | reg, val); +} + +static int regmap_mdio_c45_write(void *context, unsigned int reg, unsigned int val) +{ + struct mdio_device *mdio_dev = context; + + if (unlikely(reg & ~REGNUM_C45_MASK)) + return -ENXIO; + + return regmap_mdio_write(mdio_dev, MII_ADDR_C45 | 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 <sander@svanheule.net>"); +MODULE_DESCRIPTION("Regmap MDIO Module"); +MODULE_LICENSE("GPL v2"); |