122 lines
3.0 KiB
C
122 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/errno.h>
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#include <linux/mdio.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#define REGVAL_MASK GENMASK(15, 0)
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#define REGNUM_C22_MASK GENMASK(4, 0)
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/* Clause-45 mask includes the device type (5 bit) and actual register number (16 bit) */
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#define REGNUM_C45_MASK GENMASK(20, 0)
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static int regmap_mdio_c22_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct mdio_device *mdio_dev = context;
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int ret;
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if (unlikely(reg & ~REGNUM_C22_MASK))
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return -ENXIO;
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ret = mdiodev_read(mdio_dev, reg);
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if (ret < 0)
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return ret;
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*val = ret & REGVAL_MASK;
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return 0;
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}
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static int regmap_mdio_c22_write(void *context, unsigned int reg, unsigned int val)
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{
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struct mdio_device *mdio_dev = context;
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if (unlikely(reg & ~REGNUM_C22_MASK))
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return -ENXIO;
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return mdiodev_write(mdio_dev, reg, val);
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}
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static const struct regmap_bus regmap_mdio_c22_bus = {
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.reg_write = regmap_mdio_c22_write,
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.reg_read = regmap_mdio_c22_read,
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};
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static int regmap_mdio_c45_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct mdio_device *mdio_dev = context;
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unsigned int devad;
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int ret;
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if (unlikely(reg & ~REGNUM_C45_MASK))
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return -ENXIO;
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devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT;
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reg = reg & REGMAP_MDIO_C45_REGNUM_MASK;
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ret = mdiodev_c45_read(mdio_dev, devad, reg);
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if (ret < 0)
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return ret;
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*val = ret & REGVAL_MASK;
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return 0;
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}
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static int regmap_mdio_c45_write(void *context, unsigned int reg, unsigned int val)
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{
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struct mdio_device *mdio_dev = context;
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unsigned int devad;
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if (unlikely(reg & ~REGNUM_C45_MASK))
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return -ENXIO;
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devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT;
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reg = reg & REGMAP_MDIO_C45_REGNUM_MASK;
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return mdiodev_c45_write(mdio_dev, devad, reg, val);
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}
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static const struct regmap_bus regmap_mdio_c45_bus = {
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.reg_write = regmap_mdio_c45_write,
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.reg_read = regmap_mdio_c45_read,
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};
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struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev,
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const struct regmap_config *config, struct lock_class_key *lock_key,
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const char *lock_name)
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{
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const struct regmap_bus *bus;
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if (config->reg_bits == 5 && config->val_bits == 16)
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bus = ®map_mdio_c22_bus;
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else if (config->reg_bits == 21 && config->val_bits == 16)
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bus = ®map_mdio_c45_bus;
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else
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return ERR_PTR(-EOPNOTSUPP);
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return __regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__regmap_init_mdio);
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struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev,
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const struct regmap_config *config, struct lock_class_key *lock_key,
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const char *lock_name)
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{
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const struct regmap_bus *bus;
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if (config->reg_bits == 5 && config->val_bits == 16)
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bus = ®map_mdio_c22_bus;
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else if (config->reg_bits == 21 && config->val_bits == 16)
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bus = ®map_mdio_c45_bus;
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else
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return ERR_PTR(-EOPNOTSUPP);
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return __devm_regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio);
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MODULE_AUTHOR("Sander Vanheule <sander@svanheule.net>");
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MODULE_DESCRIPTION("Regmap MDIO Module");
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MODULE_LICENSE("GPL v2");
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