net: libphy: Add phy specific function to access mmd phy registers
libphy was originally written assuming all phy devices support clause 45
access extensions to the mmd registers through the indirection registers
located within the first 16 phy registers. This assumption is not true
in all cases, and one specific example is the Micrel ksz9021 10/100/1000
Mbps phy. Using the stmmac driver, accessing the mmd registers to query
and configure energy efficient Ethernet (EEE) features yielded unexpected
behavior.
This patch adds mmd access functions to the phy driver that can be
overriden by the phy specific driver if the phy does not support this
mechanism or uses it's own non-standard access mechanism. By default,
the IEEE Compatible clause 45 access mechanism described in clause 22
is used. With this patch, EEE query/configure functions as expected
using the stmmac and the Micrel ksz9021 phy.
Signed-off-by: Vince Bridgers <vbridgers2013@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index e56e269..c94e2a2 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -942,7 +942,7 @@
/**
* phy_read_mmd_indirect - reads data from the MMD registers
- * @bus: the target MII bus
+ * @phydev: The PHY device bus
* @prtad: MMD Address
* @devad: MMD DEVAD
* @addr: PHY address on the MII bus
@@ -955,18 +955,26 @@
* 3) Write reg 13 // MMD Data Command for MMD DEVAD
* 3) Read reg 14 // Read MMD data
*/
-static int phy_read_mmd_indirect(struct mii_bus *bus, int prtad, int devad,
- int addr)
+static int phy_read_mmd_indirect(struct phy_device *phydev, int prtad,
+ int devad, int addr)
{
- mmd_phy_indirect(bus, prtad, devad, addr);
+ struct phy_driver *phydrv = phydev->drv;
+ int value = -1;
- /* Read the content of the MMD's selected register */
- return bus->read(bus, addr, MII_MMD_DATA);
+ if (phydrv->read_mmd_indirect == NULL) {
+ mmd_phy_indirect(phydev->bus, prtad, devad, addr);
+
+ /* Read the content of the MMD's selected register */
+ value = phydev->bus->read(phydev->bus, addr, MII_MMD_DATA);
+ } else {
+ value = phydrv->read_mmd_indirect(phydev, prtad, devad, addr);
+ }
+ return value;
}
/**
* phy_write_mmd_indirect - writes data to the MMD registers
- * @bus: the target MII bus
+ * @phydev: The PHY device
* @prtad: MMD Address
* @devad: MMD DEVAD
* @addr: PHY address on the MII bus
@@ -980,13 +988,19 @@
* 3) Write reg 13 // MMD Data Command for MMD DEVAD
* 3) Write reg 14 // Write MMD data
*/
-static void phy_write_mmd_indirect(struct mii_bus *bus, int prtad, int devad,
- int addr, u32 data)
+static void phy_write_mmd_indirect(struct phy_device *phydev, int prtad,
+ int devad, int addr, u32 data)
{
- mmd_phy_indirect(bus, prtad, devad, addr);
+ struct phy_driver *phydrv = phydev->drv;
- /* Write the data into MMD's selected register */
- bus->write(bus, addr, MII_MMD_DATA, data);
+ if (phydrv->write_mmd_indirect == NULL) {
+ mmd_phy_indirect(phydev->bus, prtad, devad, addr);
+
+ /* Write the data into MMD's selected register */
+ phydev->bus->write(phydev->bus, addr, MII_MMD_DATA, data);
+ } else {
+ phydrv->write_mmd_indirect(phydev, prtad, devad, addr, data);
+ }
}
/**
@@ -1020,7 +1034,7 @@
return status;
/* First check if the EEE ability is supported */
- eee_cap = phy_read_mmd_indirect(phydev->bus, MDIO_PCS_EEE_ABLE,
+ eee_cap = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE,
MDIO_MMD_PCS, phydev->addr);
if (eee_cap < 0)
return eee_cap;
@@ -1032,12 +1046,12 @@
/* Check which link settings negotiated and verify it in
* the EEE advertising registers.
*/
- eee_lp = phy_read_mmd_indirect(phydev->bus, MDIO_AN_EEE_LPABLE,
+ eee_lp = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE,
MDIO_MMD_AN, phydev->addr);
if (eee_lp < 0)
return eee_lp;
- eee_adv = phy_read_mmd_indirect(phydev->bus, MDIO_AN_EEE_ADV,
+ eee_adv = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
MDIO_MMD_AN, phydev->addr);
if (eee_adv < 0)
return eee_adv;
@@ -1052,15 +1066,16 @@
/* Configure the PHY to stop receiving xMII
* clock while it is signaling LPI.
*/
- int val = phy_read_mmd_indirect(phydev->bus, MDIO_CTRL1,
+ int val = phy_read_mmd_indirect(phydev, MDIO_CTRL1,
MDIO_MMD_PCS,
phydev->addr);
if (val < 0)
return val;
val |= MDIO_PCS_CTRL1_CLKSTOP_EN;
- phy_write_mmd_indirect(phydev->bus, MDIO_CTRL1,
- MDIO_MMD_PCS, phydev->addr, val);
+ phy_write_mmd_indirect(phydev, MDIO_CTRL1,
+ MDIO_MMD_PCS, phydev->addr,
+ val);
}
return 0; /* EEE supported */
@@ -1079,7 +1094,7 @@
*/
int phy_get_eee_err(struct phy_device *phydev)
{
- return phy_read_mmd_indirect(phydev->bus, MDIO_PCS_EEE_WK_ERR,
+ return phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_WK_ERR,
MDIO_MMD_PCS, phydev->addr);
}
EXPORT_SYMBOL(phy_get_eee_err);
@@ -1097,21 +1112,21 @@
int val;
/* Get Supported EEE */
- val = phy_read_mmd_indirect(phydev->bus, MDIO_PCS_EEE_ABLE,
+ val = phy_read_mmd_indirect(phydev, MDIO_PCS_EEE_ABLE,
MDIO_MMD_PCS, phydev->addr);
if (val < 0)
return val;
data->supported = mmd_eee_cap_to_ethtool_sup_t(val);
/* Get advertisement EEE */
- val = phy_read_mmd_indirect(phydev->bus, MDIO_AN_EEE_ADV,
+ val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
MDIO_MMD_AN, phydev->addr);
if (val < 0)
return val;
data->advertised = mmd_eee_adv_to_ethtool_adv_t(val);
/* Get LP advertisement EEE */
- val = phy_read_mmd_indirect(phydev->bus, MDIO_AN_EEE_LPABLE,
+ val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_LPABLE,
MDIO_MMD_AN, phydev->addr);
if (val < 0)
return val;
@@ -1132,7 +1147,7 @@
{
int val = ethtool_adv_to_mmd_eee_adv_t(data->advertised);
- phy_write_mmd_indirect(phydev->bus, MDIO_AN_EEE_ADV, MDIO_MMD_AN,
+ phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV, MDIO_MMD_AN,
phydev->addr, val);
return 0;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 6804144..ed39956 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -545,6 +545,24 @@
*/
void (*link_change_notify)(struct phy_device *dev);
+ /* A function provided by a phy specific driver to override the
+ * the PHY driver framework support for reading a MMD register
+ * from the PHY. If not supported, return -1. This function is
+ * optional for PHY specific drivers, if not provided then the
+ * default MMD read function is used by the PHY framework.
+ */
+ int (*read_mmd_indirect)(struct phy_device *dev, int ptrad,
+ int devnum, int regnum);
+
+ /* A function provided by a phy specific driver to override the
+ * the PHY driver framework support for writing a MMD register
+ * from the PHY. This function is optional for PHY specific drivers,
+ * if not provided then the default MMD read function is used by
+ * the PHY framework.
+ */
+ void (*write_mmd_indirect)(struct phy_device *dev, int ptrad,
+ int devnum, int regnum, u32 val);
+
struct device_driver driver;
};
#define to_phy_driver(d) container_of(d, struct phy_driver, driver)