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[mdio] Add MDIO support for "extended" registers as defined by IEEE 802.3 Clause 45. 

IEEE 802.3 Clause 45 added backwards-compatible support for 2^16 PHY registers
through the addition of an additional device address frame.

Clause 45 addressing is used in 10Gbe PHYs, 802.3az EEE registers, etc. It may
make sense to provide a similar extension to the miibus interface, but I've
refrained from unilaterally doing so here.

Submitted by:	Landon Fuller <landon@landonf.org>
Differential Revision:	https://reviews.freebsd.org/D4607
This commit is contained in:
Adrian Chadd 2015-12-26 17:22:02 +00:00
parent 1899507706
commit e2db1d1f11
3 changed files with 92 additions and 6 deletions
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17
sys/dev/mdio/mdio.c
View File

@ -83,6 +83,21 @@ mdio_writereg(device_t dev, int phy, int reg, int val)
return (MDIO_WRITEREG(device_get_parent(dev), phy, reg, val));
}
static int
mdio_readextreg(device_t dev, int phy, int devad, int reg)
{
return (MDIO_READEXTREG(device_get_parent(dev), phy, devad, reg));
}
static int
mdio_writeextreg(device_t dev, int phy, int devad, int reg,
int val)
{
return (MDIO_WRITEEXTREG(device_get_parent(dev), phy, devad, reg, val));
}
static void
mdio_hinted_child(device_t dev, const char *name, int unit)
{
@ -105,6 +120,8 @@ static device_method_t mdio_methods[] = {
/* MDIO access */
DEVMETHOD(mdio_readreg, mdio_readreg),
DEVMETHOD(mdio_writereg, mdio_writereg),
DEVMETHOD(mdio_readextreg, mdio_readextreg),
DEVMETHOD(mdio_writeextreg, mdio_writeextreg),
DEVMETHOD_END
};

2
sys/dev/mdio/mdio.h
View File

@ -32,4 +32,6 @@
extern driver_t mdio_driver;
extern devclass_t mdio_devclass;
#define MDIO_DEVADDR_NONE -1 /**< Use clause 22 register access */
#endif /* __DEV_MDIO_MDIO_H__ */

79
sys/dev/mdio/mdio_if.m
View File

@ -4,21 +4,88 @@
INTERFACE mdio;
#
# Read register from device on MDIO bus
#
CODE {
#include <dev/mdio/mdio.h>
static int
mdio_null_readextreg(device_t dev, int phy, int devad, int reg)
{
if (devad == MDIO_DEVADDR_NONE)
return (MDIO_READREG(dev, phy, reg));
return (~0U);
}
static int
mdio_null_writeextreg(device_t dev, int phy, int devad, int reg,
int val)
{
if (devad == MDIO_DEVADDR_NONE)
return (MDIO_WRITEREG(dev, phy, reg, val));
return (EINVAL);
}
}
/**
* @brief Read register from device on MDIO bus.
*
* @param dev MDIO bus device.
* @param phy PHY address.
* @param reg The PHY register offset.
*/
METHOD int readreg {
device_t dev;
int phy;
int reg;
};
#
# Write register to device on MDIO bus
#
/**
* @brief Write register to device on MDIO bus.
*
* @param dev MDIO bus device.
* @param phy PHY address.
* @param reg The PHY register offset.
* @param val The value to write at offset @p reg.
*/
METHOD int writereg {
device_t dev;
int phy;
int reg;
int val;
};
/**
* @brief Read extended register from device on MDIO bus.
*
* @param dev MDIO bus device.
* @param phy PHY address.
* @param devad The MDIO IEEE 802.3 Clause 45 device address, or
* MDIO_DEVADDR_NONE to request Clause 22 register addressing.
* @param reg The PHY register offset.
*/
METHOD int readextreg {
device_t dev;
int phy;
int devad;
int reg;
} DEFAULT mdio_null_readextreg;
/**
* @brief Write extended register to device on MDIO bus.
*
* @param dev MDIO bus device.
* @param phy PHY address.
* @param devad The MDIO IEEE 802.3 Clause 45 device address, or
* MDIO_DEVADDR_NONE to request Clause 22 register addressing.
* @param reg The PHY register offset.
* @param val The value to write at offset @p reg.
*/
METHOD int writeextreg {
device_t dev;
int phy;
int devad;
int reg;
int val;
} DEFAULT mdio_null_writeextreg;