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regmap: mdio: Add clause-45 support 

Modern ethernet phys support the so-called clause-45 register access
mode, which allows for register address widths of 16 bit.

Also allow for 16-bit register address widths, and return a regmap for
clause-45 access in that case.

Signed-off-by: Sander Vanheule <sander@svanheule.net>
Link: https://lore.kernel.org/r/9cc263e3e7d5865edd90453b4183f1cf363cb636.1622743333.git.sander@svanheule.net
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sander Vanheule 2021-06-03 20:25:10 +02:00 committed by Mark Brown
parent dff404deb8
commit f083be9db0
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 56 additions and 14 deletions
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70
drivers/base/regmap/regmap-mdio.c
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@ -7,13 +7,14 @@
#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(void *context, unsigned int reg, unsigned int *val)
static int regmap_mdio_read(struct mdio_device *mdio_dev, u32 reg, unsigned int *val)
{
struct mdio_device *mdio_dev = context;
int ret;
ret = mdiobus_read(mdio_dev->bus, mdio_dev->addr, reg & REGNUM_C22_MASK);
ret = mdiobus_read(mdio_dev->bus, mdio_dev->addr, reg);
if (ret < 0)
return ret;
@ -21,27 +22,63 @@ static int regmap_mdio_read(void *context, unsigned int reg, unsigned int *val)
return 0;
}
static int regmap_mdio_write(void *context, unsigned int reg, unsigned int val)
static int regmap_mdio_write(struct mdio_device *mdio_dev, u32 reg, unsigned int val)
{
return mdiobus_write(mdio_dev->bus, mdio_dev->addr, reg, val);
}
static int regmap_mdio_c22_read(void *context, unsigned int reg, unsigned int *val)
{
struct mdio_device *mdio_dev = context;
return mdiobus_write(mdio_dev->bus, mdio_dev->addr, reg & REGNUM_C22_MASK, val);
return regmap_mdio_read(mdio_dev, reg & REGNUM_C22_MASK, val);
}
static const struct regmap_bus regmap_mdio_bus = {
.reg_write = regmap_mdio_write,
.reg_read = regmap_mdio_read,
static int regmap_mdio_c22_write(void *context, unsigned int reg, unsigned int val)
{
struct mdio_device *mdio_dev = context;
return regmap_mdio_write(mdio_dev, reg & REGNUM_C22_MASK, 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;
return regmap_mdio_read(mdio_dev, MII_ADDR_C45 | (reg & REGNUM_C45_MASK), val);
}
static int regmap_mdio_c45_write(void *context, unsigned int reg, unsigned int val)
{
struct mdio_device *mdio_dev = context;
return regmap_mdio_write(mdio_dev, MII_ADDR_C45 | (reg & REGNUM_C45_MASK), 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)
{
if (config->reg_bits != 5 || config->val_bits != 16)
struct regmap_bus *bus;
if (config->reg_bits == 5 && config->val_bits == 16)
bus = &regmap_mdio_c22_bus;
else if (config->reg_bits == 21 && config->val_bits == 16)
bus = &regmap_mdio_c45_bus;
else
return ERR_PTR(-EOPNOTSUPP);
return __regmap_init(&mdio_dev->dev, &regmap_mdio_bus, mdio_dev, config,
lock_key, lock_name);
return __regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_mdio);
@ -49,11 +86,16 @@ 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)
{
if (config->reg_bits != 5 || config->val_bits != 16)
const struct regmap_bus *bus;
if (config->reg_bits == 5 && config->val_bits == 16)
bus = &regmap_mdio_c22_bus;
else if (config->reg_bits == 21 && config->val_bits == 16)
bus = &regmap_mdio_c45_bus;
else
return ERR_PTR(-EOPNOTSUPP);
return __devm_regmap_init(&mdio_dev->dev, &regmap_mdio_bus, mdio_dev,
config, lock_key, lock_name);
return __devm_regmap_init(&mdio_dev->dev, bus, mdio_dev, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio);