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authorLennert Buytenhek <buytenh@wantstofly.org>2008-09-29 17:12:35 +0000
committerDavid S. Miller <davem@davemloft.net>2008-10-08 16:38:41 -0700
commit2e888103295f47b8fcbf7e9bb8c5da97dd2ecd76 (patch)
tree210943ed285496352078124fd2a43443b1e5b265 /drivers/net/phy/mdio_bus.c
parent46abc02175b3c246dd5141d878f565a8725060c9 (diff)
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>
Diffstat (limited to 'drivers/net/phy/mdio_bus.c')
-rw-r--r--drivers/net/phy/mdio_bus.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index fb4c0965b152..6671e2da0d57 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -211,6 +211,55 @@ 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
* @drv: given PHY driver