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phylib: add mdiobus_{read,write} 

Add mdiobus_{read,write} routines to allow direct reading/writing
of registers on an mii bus without having to go through the PHY
abstraction, and make phy_{read,write} use these primitives.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Lennert Buytenhek 2008-09-29 17:12:35 +00:00 committed by David S. Miller
parent 46abc02175
commit 2e88810329
3 changed files with 87 additions and 57 deletions
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49
drivers/net/phy/mdio_bus.c
View File

@ -210,6 +210,55 @@ struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
}
EXPORT_SYMBOL(mdiobus_scan);
/**
* mdiobus_read - Convenience function for reading a given MII mgmt register
* @bus: the mii_bus struct
* @addr: the phy address
* @regnum: register number to read
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int mdiobus_read(struct mii_bus *bus, int addr, u16 regnum)
{
int retval;
BUG_ON(in_interrupt());
mutex_lock(&bus->mdio_lock);
retval = bus->read(bus, addr, regnum);
mutex_unlock(&bus->mdio_lock);
return retval;
}
EXPORT_SYMBOL(mdiobus_read);
/**
* mdiobus_write - Convenience function for writing a given MII mgmt register
* @bus: the mii_bus struct
* @addr: the phy address
* @regnum: register number to write
* @val: value to write to @regnum
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int mdiobus_write(struct mii_bus *bus, int addr, u16 regnum, u16 val)
{
int err;
BUG_ON(in_interrupt());
mutex_lock(&bus->mdio_lock);
err = bus->write(bus, addr, regnum, val);
mutex_unlock(&bus->mdio_lock);
return err;
}
EXPORT_SYMBOL(mdiobus_write);
/**
* mdio_bus_match - determine if given PHY driver supports the given PHY device
* @dev: target PHY device

49
drivers/net/phy/phy.c
View File

@ -57,55 +57,6 @@ void phy_print_status(struct phy_device *phydev)
EXPORT_SYMBOL(phy_print_status);
/**
* phy_read - Convenience function for reading a given PHY register
* @phydev: the phy_device struct
* @regnum: register number to read
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int phy_read(struct phy_device *phydev, u16 regnum)
{
int retval;
struct mii_bus *bus = phydev->bus;
BUG_ON(in_interrupt());
mutex_lock(&bus->mdio_lock);
retval = bus->read(bus, phydev->addr, regnum);
mutex_unlock(&bus->mdio_lock);
return retval;
}
EXPORT_SYMBOL(phy_read);
/**
* phy_write - Convenience function for writing a given PHY register
* @phydev: the phy_device struct
* @regnum: register number to write
* @val: value to write to @regnum
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
{
int err;
struct mii_bus *bus = phydev->bus;
BUG_ON(in_interrupt());
mutex_lock(&bus->mdio_lock);
err = bus->write(bus, phydev->addr, regnum, val);
mutex_unlock(&bus->mdio_lock);
return err;
}
EXPORT_SYMBOL(phy_write);
/**
* phy_clear_interrupt - Ack the phy device's interrupt
* @phydev: the phy_device struct

46
include/linux/phy.h
View File

@ -122,6 +122,15 @@ struct mii_bus {
};
#define to_mii_bus(d) container_of(d, struct mii_bus, dev)
struct mii_bus *mdiobus_alloc(void);
int mdiobus_register(struct mii_bus *bus);
void mdiobus_unregister(struct mii_bus *bus);
void mdiobus_free(struct mii_bus *bus);
struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
int mdiobus_read(struct mii_bus *bus, int addr, u16 regnum);
int mdiobus_write(struct mii_bus *bus, int addr, u16 regnum, u16 val);
#define PHY_INTERRUPT_DISABLED 0x0
#define PHY_INTERRUPT_ENABLED 0x80000000
@ -399,8 +408,35 @@ struct phy_fixup {
int (*run)(struct phy_device *phydev);
};
int phy_read(struct phy_device *phydev, u16 regnum);
int phy_write(struct phy_device *phydev, u16 regnum, u16 val);
/**
* phy_read - Convenience function for reading a given PHY register
* @phydev: the phy_device struct
* @regnum: register number to read
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
static inline int phy_read(struct phy_device *phydev, u16 regnum)
{
return mdiobus_read(phydev->bus, phydev->addr, regnum);
}
/**
* phy_write - Convenience function for writing a given PHY register
* @phydev: the phy_device struct
* @regnum: register number to write
* @val: value to write to @regnum
*
* NOTE: MUST NOT be called from interrupt context,
* because the bus read/write functions may wait for an interrupt
* to conclude the operation.
*/
static inline int phy_write(struct phy_device *phydev, u16 regnum, u16 val)
{
return mdiobus_write(phydev->bus, phydev->addr, regnum, val);
}
int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id);
struct phy_device* get_phy_device(struct mii_bus *bus, int addr);
int phy_clear_interrupt(struct phy_device *phydev);
@ -416,12 +452,6 @@ void phy_start(struct phy_device *phydev);
void phy_stop(struct phy_device *phydev);
int phy_start_aneg(struct phy_device *phydev);
struct mii_bus *mdiobus_alloc(void);
int mdiobus_register(struct mii_bus *bus);
void mdiobus_unregister(struct mii_bus *bus);
void mdiobus_free(struct mii_bus *bus);
struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
void phy_sanitize_settings(struct phy_device *phydev);
int phy_stop_interrupts(struct phy_device *phydev);
int phy_enable_interrupts(struct phy_device *phydev);