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From 5d84f16b0036b33487b94abef15ad3c224c81ee9 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Thu, 3 Feb 2022 16:38:50 +0000
Subject: [PATCH] net: mdio: support hardware-assisted indirect access
MDIO controllers found in Switch-SoCs can offload some MDIO operations
to the hardware:
* MMD register access via Clause-22
Instead of using multiple operations to access MMD registers via
MII register MII_MMD_CTRL and MII_MMD_DATA some controllers
allow transparent access to MMD PHY registers.
* paged MII register access
Some PHYs (namely RealTek and Vitesse) use vendor-defined MII
register 0x1f for paged access. Some MDIO host controllers support
transparent paged access when used with such PHYs.
* add convenience accessors to fully support paged access also on
multi-PHY packages (like the embedded PHYs in RTL83xx):
phy_package_read_paged and phy_package_write_paged
phy_package_port_read and phy_package_port_write
phy_package_port_read_paged and phy_package_port_write_paged
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/net/phy/mdio_bus.c | 335 ++++++++++++++++++++++++++++++++++++-
drivers/net/phy/phy-core.c | 66 +++++++-
include/linux/mdio.h | 59 +++++++
include/linux/phy.h | 129 ++++++++++++++
include/uapi/linux/mii.h | 1 +
5 files changed, 580 insertions(+), 10 deletions(-)
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -739,6 +739,32 @@ out:
}
/**
+ * __mdiobus_select_page - Unlocked version of the mdiobus_select_page function
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: register page to select
+ *
+ * Selects a MDIO bus register page. Caller must hold the mdio bus lock.
+ *
+ * NOTE: MUST NOT be called from interrupt context.
+ */
+int __mdiobus_select_page(struct mii_bus *bus, int addr, u16 page)
+{
+ lockdep_assert_held_once(&bus->mdio_lock);
+
+ if (bus->selected_page[addr] == page)
+ return 0;
+
+ bus->selected_page[addr] = page;
+ if (bus->read_paged)
+ return 0;
+
+ return bus->write(bus, addr, MII_MAINPAGE, page);
+
+}
+EXPORT_SYMBOL(__mdiobus_select_page);
+
+/**
* __mdiobus_read - Unlocked version of the mdiobus_read function
* @bus: the mii_bus struct
* @addr: the phy address
@@ -754,7 +780,10 @@ int __mdiobus_read(struct mii_bus *bus,
WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));
- retval = bus->read(bus, addr, regnum);
+ if (bus->read_paged)
+ retval = bus->read_paged(bus, addr, bus->selected_page[addr], regnum);
+ else
+ retval = bus->read(bus, addr, regnum);
trace_mdio_access(bus, 1, addr, regnum, retval, retval);
mdiobus_stats_acct(&bus->stats[addr], true, retval);
@@ -764,6 +793,40 @@ int __mdiobus_read(struct mii_bus *bus,
EXPORT_SYMBOL(__mdiobus_read);
/**
+ * __mdiobus_read_paged - Unlocked version of the mdiobus_read_paged function
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: the register page to access
+ * @regnum: register number to read
+ *
+ * Read a MDIO bus register. Caller must hold the mdio bus lock.
+ *
+ * NOTE: MUST NOT be called from interrupt context.
+ */
+int __mdiobus_read_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum)
+{
+ int retval;
+ int oldpage;
+
+ lockdep_assert_held_once(&bus->mdio_lock);
+
+ if (bus->read_paged) {
+ retval = bus->read_paged(bus, addr, page, regnum);
+ } else {
+ oldpage = bus->selected_page[addr];
+ __mdiobus_select_page(bus, addr, page);
+ retval = bus->read(bus, addr, regnum);
+ __mdiobus_select_page(bus, addr, oldpage);
+ }
+
+ trace_mdio_access(bus, 1, addr, regnum, retval, retval);
+ mdiobus_stats_acct(&bus->stats[addr], true, retval);
+
+ return retval;
+}
+EXPORT_SYMBOL(__mdiobus_read_paged);
+
+/**
* __mdiobus_write - Unlocked version of the mdiobus_write function
* @bus: the mii_bus struct
* @addr: the phy address
@@ -780,7 +843,10 @@ int __mdiobus_write(struct mii_bus *bus,
WARN_ON_ONCE(!mutex_is_locked(&bus->mdio_lock));
- err = bus->write(bus, addr, regnum, val);
+ if (bus->write_paged)
+ err = bus->write_paged(bus, addr, bus->selected_page[addr], regnum, val);
+ else
+ err = bus->write(bus, addr, regnum, val);
trace_mdio_access(bus, 0, addr, regnum, val, err);
mdiobus_stats_acct(&bus->stats[addr], false, err);
@@ -790,6 +856,39 @@ int __mdiobus_write(struct mii_bus *bus,
EXPORT_SYMBOL(__mdiobus_write);
/**
+ * __mdiobus_write_paged - Unlocked version of the mdiobus_write_paged function
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: the register page to access
+ * @regnum: register number to write
+ * @val: value to write to @regnum
+ *
+ * Write a MDIO bus register. Caller must hold the mdio bus lock.
+ *
+ * NOTE: MUST NOT be called from interrupt context.
+ */
+int __mdiobus_write_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum, u16 val)
+{
+ int err, oldpage;
+
+ lockdep_assert_held_once(&bus->mdio_lock);
+
+ if (bus->write_paged) {
+ err = bus->write_paged(bus, addr, page, regnum, val);
+ } else {
+ oldpage = bus->selected_page[addr];
+ __mdiobus_select_page(bus, addr, page);
+ err = bus->write(bus, addr, regnum, val);
+ __mdiobus_select_page(bus, addr, oldpage);
+ }
+ trace_mdio_access(bus, 0, addr, regnum, val, err);
+ mdiobus_stats_acct(&bus->stats[addr], false, err);
+ return err;
+}
+EXPORT_SYMBOL(__mdiobus_write_paged);
+
+
+/**
* __mdiobus_modify_changed - Unlocked version of the mdiobus_modify function
* @bus: the mii_bus struct
* @addr: the phy address
@@ -822,6 +921,43 @@ int __mdiobus_modify_changed(struct mii_
EXPORT_SYMBOL_GPL(__mdiobus_modify_changed);
/**
+ * __mdiobus_modify_changed_paged - Unlocked version of the mdiobus_modify_paged function
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @regnum: register number to modify
+ * @mask: bit mask of bits to clear
+ * @set: bit mask of bits to set
+ *
+ * Read, modify, and if any change, write the register value back to the
+ * device. Any error returns a negative number.
+ *
+ * NOTE: MUST NOT be called from interrupt context.
+ */
+int __mdiobus_modify_changed_paged(struct mii_bus *bus, int addr, u32 regnum, u16 page,
+ u16 mask, u16 set)
+{
+ int new, ret, oldpage;
+
+ oldpage = bus->selected_page[addr];
+ __mdiobus_select_page(bus, addr, page);
+
+ ret = __mdiobus_read_paged(bus, addr, page, regnum);
+ if (ret < 0)
+ return ret;
+
+ new = (ret & ~mask) | set;
+ if (new == ret)
+ return 0;
+
+ ret = __mdiobus_write_paged(bus, addr, page, regnum, new);
+
+ __mdiobus_select_page(bus, addr, oldpage);
+
+ return ret < 0 ? ret : 1;
+}
+EXPORT_SYMBOL_GPL(__mdiobus_modify_changed_paged);
+
+/**
* mdiobus_read_nested - Nested version of the mdiobus_read function
* @bus: the mii_bus struct
* @addr: the phy address
@@ -847,6 +983,79 @@ int mdiobus_read_nested(struct mii_bus *
EXPORT_SYMBOL(mdiobus_read_nested);
/**
+ * mdiobus_select_page_nested - Nested version of the mdiobus_select_page function
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: register page to access
+ *
+ * In case of nested MDIO bus access avoid lockdep false positives by
+ * using mutex_lock_nested().
+ *
+ * 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_select_page_nested(struct mii_bus *bus, int addr, u16 page)
+{
+ int retval;
+
+ mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
+ retval = __mdiobus_select_page(bus, addr, page);
+ mutex_unlock(&bus->mdio_lock);
+
+ return retval;
+}
+EXPORT_SYMBOL(mdiobus_select_page_nested);
+
+/**
+ * mdiobus_read_paged_nested - Nested version of the mdiobus_read_paged function
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: register page to access
+ * @regnum: register number to read
+ *
+ * In case of nested MDIO bus access avoid lockdep false positives by
+ * using mutex_lock_nested().
+ *
+ * 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_paged_nested(struct mii_bus *bus, int addr, u16 page, u32 regnum)
+{
+ int retval;
+
+ mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
+ retval = __mdiobus_read_paged(bus, addr, page, regnum);
+ mutex_unlock(&bus->mdio_lock);
+
+ return retval;
+}
+EXPORT_SYMBOL(mdiobus_read_paged_nested);
+
+/**
+ * mdiobus_select_page - Convenience function for setting the MII register page
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: the register page to set
+ *
+ * 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_select_page(struct mii_bus *bus, int addr, u16 page)
+{
+ int retval;
+
+ mutex_lock(&bus->mdio_lock);
+ retval = __mdiobus_select_page(bus, addr, page);
+ mutex_unlock(&bus->mdio_lock);
+
+ return retval;
+}
+EXPORT_SYMBOL(mdiobus_select_page);
+
+/**
* mdiobus_read - Convenience function for reading a given MII mgmt register
* @bus: the mii_bus struct
* @addr: the phy address
@@ -869,6 +1078,29 @@ int mdiobus_read(struct mii_bus *bus, in
EXPORT_SYMBOL(mdiobus_read);
/**
+ * mdiobus_read_paged - Convenience function for reading a given paged MII mgmt register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: register page to access
+ * @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_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum)
+{
+ int retval;
+
+ mutex_lock(&bus->mdio_lock);
+ retval = __mdiobus_read_paged(bus, addr, page, regnum);
+ mutex_unlock(&bus->mdio_lock);
+
+ return retval;
+}
+EXPORT_SYMBOL(mdiobus_read_paged);
+
+/**
* mdiobus_write_nested - Nested version of the mdiobus_write function
* @bus: the mii_bus struct
* @addr: the phy address
@@ -895,6 +1127,33 @@ int mdiobus_write_nested(struct mii_bus
EXPORT_SYMBOL(mdiobus_write_nested);
/**
+ * mdiobus_write_paged_nested - Nested version of the mdiobus_write_aged function
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: the register page to access
+ * @regnum: register number to write
+ * @val: value to write to @regnum
+ *
+ * In case of nested MDIO bus access avoid lockdep false positives by
+ * using mutex_lock_nested().
+ *
+ * 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_paged_nested(struct mii_bus *bus, int addr, u16 page, u32 regnum, u16 val)
+{
+ int err;
+
+ mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);
+ err = __mdiobus_write_paged(bus, addr, page, regnum, val);
+ mutex_unlock(&bus->mdio_lock);
+
+ return err;
+}
+EXPORT_SYMBOL(mdiobus_write_paged_nested);
+
+/**
* mdiobus_write - Convenience function for writing a given MII mgmt register
* @bus: the mii_bus struct
* @addr: the phy address
@@ -918,6 +1177,30 @@ int mdiobus_write(struct mii_bus *bus, i
EXPORT_SYMBOL(mdiobus_write);
/**
+ * mdiobus_write_paged - Convenience function for writing a given paged MII mgmt register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: the register page to access
+ * @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_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum, u16 val)
+{
+ int err;
+
+ mutex_lock(&bus->mdio_lock);
+ err = __mdiobus_write_paged(bus, addr, page, regnum, val);
+ mutex_unlock(&bus->mdio_lock);
+
+ return err;
+}
+EXPORT_SYMBOL(mdiobus_write_paged);
+
+/**
* mdiobus_modify - Convenience function for modifying a given mdio device
* register
* @bus: the mii_bus struct
@@ -939,6 +1222,51 @@ int mdiobus_modify(struct mii_bus *bus,
EXPORT_SYMBOL_GPL(mdiobus_modify);
/**
+ * mdiobus_modify_paged - Convenience function for modifying a given mdio device
+ * register
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: the register page to access
+ * @regnum: register number to write
+ * @mask: bit mask of bits to clear
+ * @set: bit mask of bits to set
+ */
+int mdiobus_modify_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum, u16 mask, u16 set)
+{
+ int err;
+
+ mutex_lock(&bus->mdio_lock);
+ err = __mdiobus_modify_changed_paged(bus, addr, page, regnum, mask, set);
+ mutex_unlock(&bus->mdio_lock);
+
+ return err < 0 ? err : 0;
+}
+EXPORT_SYMBOL_GPL(mdiobus_modify_paged);
+
+/**
+ * mdiobus_modify_changed_paged - Convenience function for modifying a given paged
+ * mdio device register and returning if it changed
+ * @bus: the mii_bus struct
+ * @addr: the phy address
+ * @page: the register page to access
+ * @regnum: register number to write
+ * @mask: bit mask of bits to clear
+ * @set: bit mask of bits to set
+ */
+int mdiobus_modify_changed_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum,
+ u16 mask, u16 set)
+{
+ int err;
+
+ mutex_lock(&bus->mdio_lock);
+ err = __mdiobus_modify_changed_paged(bus, addr, page, regnum, mask, set);
+ mutex_unlock(&bus->mdio_lock);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(mdiobus_modify_changed_paged);
+
+/**
* mdio_bus_match - determine if given MDIO driver supports the given
* MDIO device
* @dev: target MDIO device
--- a/drivers/net/phy/phy-core.c
+++ b/drivers/net/phy/phy-core.c
@@ -481,10 +481,16 @@ int __phy_read_mmd(struct phy_device *ph
struct mii_bus *bus = phydev->mdio.bus;
int phy_addr = phydev->mdio.addr;
- mmd_phy_indirect(bus, phy_addr, devad, regnum);
-
- /* Read the content of the MMD's selected register */
- val = __mdiobus_read(bus, phy_addr, MII_MMD_DATA);
+ if (bus->access_capabilities & MDIOBUS_ACCESS_C22_MMD) {
+ val = __mdiobus_c22_mmd_read(phydev->mdio.bus,
+ phydev->mdio.addr,
+ devad, regnum);
+ } else {
+ mmd_phy_indirect(bus, phy_addr, devad, regnum);
+
+ /* Read the content of the MMD's selected register */
+ val = __mdiobus_read(bus, phy_addr, MII_MMD_DATA);
+ }
}
return val;
}
@@ -537,12 +543,18 @@ int __phy_write_mmd(struct phy_device *p
struct mii_bus *bus = phydev->mdio.bus;
int phy_addr = phydev->mdio.addr;
- mmd_phy_indirect(bus, phy_addr, devad, regnum);
+ if (bus->access_capabilities & MDIOBUS_ACCESS_C22_MMD) {
+ ret = __mdiobus_c22_mmd_write(phydev->mdio.bus,
+ phydev->mdio.addr,
+ devad, regnum, val);
+ } else {
+ mmd_phy_indirect(bus, phy_addr, devad, regnum);
- /* Write the data into MMD's selected register */
- __mdiobus_write(bus, phy_addr, MII_MMD_DATA, val);
+ /* Write the data into MMD's selected register */
+ __mdiobus_write(bus, phy_addr, MII_MMD_DATA, val);
- ret = 0;
+ ret = 0;
+ }
}
return ret;
}
@@ -748,6 +760,13 @@ EXPORT_SYMBOL_GPL(phy_modify_mmd);
static int __phy_read_page(struct phy_device *phydev)
{
+ if (phydev->drv && phydev->drv->flags & PHY_HAS_REALTEK_PAGES) {
+ struct mii_bus *bus = phydev->mdio.bus;
+ int phy_addr = phydev->mdio.addr;
+
+ return bus->selected_page[phy_addr];
+ }
+
if (WARN_ONCE(!phydev->drv->read_page, "read_page callback not available, PHY driver not loaded?\n"))
return -EOPNOTSUPP;
@@ -756,6 +775,13 @@ static int __phy_read_page(struct phy_de
static int __phy_write_page(struct phy_device *phydev, int page)
{
+ if (phydev->drv && phydev->drv->flags & PHY_HAS_REALTEK_PAGES) {
+ struct mii_bus *bus = phydev->mdio.bus;
+ int phy_addr = phydev->mdio.addr;
+
+ return __mdiobus_select_page(bus, phy_addr, page);
+ }
+
if (WARN_ONCE(!phydev->drv->write_page, "write_page callback not available, PHY driver not loaded?\n"))
return -EOPNOTSUPP;
@@ -857,6 +883,18 @@ int phy_read_paged(struct phy_device *ph
{
int ret = 0, oldpage;
+ if (phydev->drv && phydev->drv->flags & PHY_HAS_REALTEK_PAGES) {
+ struct mii_bus *bus = phydev->mdio.bus;
+ int phy_addr = phydev->mdio.addr;
+
+ if (bus->read_paged) {
+ phy_lock_mdio_bus(phydev);
+ ret = bus->read_paged(bus, phy_addr, page, regnum);
+ phy_unlock_mdio_bus(phydev);
+ return ret;
+ }
+ }
+
oldpage = phy_select_page(phydev, page);
if (oldpage >= 0)
ret = __phy_read(phydev, regnum);
@@ -878,6 +916,18 @@ int phy_write_paged(struct phy_device *p
{
int ret = 0, oldpage;
+ if (phydev->drv && phydev->drv->flags & PHY_HAS_REALTEK_PAGES) {
+ struct mii_bus *bus = phydev->mdio.bus;
+ int phy_addr = phydev->mdio.addr;
+
+ if (bus->write_paged) {
+ phy_lock_mdio_bus(phydev);
+ ret = bus->write_paged(bus, phy_addr, page, regnum, val);
+ phy_unlock_mdio_bus(phydev);
+ return ret;
+ }
+ }
+
oldpage = phy_select_page(phydev, page);
if (oldpage >= 0)
ret = __phy_write(phydev, regnum, val);
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -14,6 +14,7 @@
* IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips.
*/
#define MII_ADDR_C45 (1<<30)
+#define MII_ADDR_C22_MMD (1<<29)
#define MII_DEVADDR_C45_SHIFT 16
#define MII_DEVADDR_C45_MASK GENMASK(20, 16)
#define MII_REGADDR_C45_MASK GENMASK(15, 0)
@@ -327,11 +328,19 @@ static inline void mii_10gbt_stat_mod_li
advertising, lpa & MDIO_AN_10GBT_STAT_LP10G);
}
+int __mdiobus_select_page(struct mii_bus *bus, int addr, u16 page);
int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
u16 mask, u16 set);
+int __mdiobus_read_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum);
+int __mdiobus_write_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum, u16 val);
+int __mdiobus_modify_changed_paged(struct mii_bus *bus, int addr, u32 regnum, u16 page,
+ u16 mask, u16 set);
+
+int mdiobus_select_page(struct mii_bus *bus, int addr, u16 page);
+int mdiobus_select_page_nested(struct mii_bus *bus, int addr, u16 page);
int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum);
int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
@@ -339,11 +348,51 @@ int mdiobus_write_nested(struct mii_bus
int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,
u16 set);
+int mdiobus_read_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum);
+int mdiobus_read_nested_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum);
+int mdiobus_write_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum, u16 val);
+int mdiobus_write_nested_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum, u16 val);
+int mdiobus_modify_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum, u16 mask,
+ u16 set);
+int mdiobus_modify_changed_paged(struct mii_bus *bus, int addr, u16 page, u32 regnum,
+ u16 mask, u16 set);
+
+static inline int mdiodev_read_paged(struct mdio_device *mdiodev, u16 page,
+ u32 regnum)
+{
+ return mdiobus_read_paged(mdiodev->bus, mdiodev->addr, page, regnum);
+}
+
+static inline int mdiodev_write_paged(struct mdio_device *mdiodev, u16 page,
+ u32 regnum, u16 val)
+{
+ return mdiobus_write_paged(mdiodev->bus, mdiodev->addr, page, regnum, val);
+}
+
+static inline int mdiodev_modify_paged(struct mdio_device *mdiodev, u16 page,
+ u32 regnum, u16 mask, u16 set)
+{
+ return mdiobus_modify_paged(mdiodev->bus, mdiodev->addr, page, regnum,
+ mask, set);
+}
+
+static inline int mdiodev_modify_changed_paged(struct mdio_device *mdiodev, u16 page,
+ u32 regnum, u16 mask, u16 set)
+{
+ return mdiobus_modify_changed_paged(mdiodev->bus, mdiodev->addr, page, regnum,
+ mask, set);
+}
+
static inline u32 mdiobus_c45_addr(int devad, u16 regnum)
{
return MII_ADDR_C45 | devad << MII_DEVADDR_C45_SHIFT | regnum;
}
+static inline u32 mdiobus_c22_mmd_addr(int devad, u16 regnum)
+{
+ return MII_ADDR_C22_MMD | devad << MII_DEVADDR_C45_SHIFT | regnum;
+}
+
static inline u16 mdiobus_c45_regad(u32 regnum)
{
return FIELD_GET(MII_REGADDR_C45_MASK, regnum);
@@ -367,6 +416,19 @@ static inline int __mdiobus_c45_write(st
val);
}
+static inline int __mdiobus_c22_mmd_read(struct mii_bus *bus, int prtad,
+ int devad, u16 regnum)
+{
+ return __mdiobus_read(bus, prtad, mdiobus_c22_mmd_addr(devad, regnum));
+}
+
+static inline int __mdiobus_c22_mmd_write(struct mii_bus *bus, int prtad,
+ int devad, u16 regnum, u16 val)
+{
+ return __mdiobus_write(bus, prtad, mdiobus_c22_mmd_addr(devad, regnum),
+ val);
+}
+
static inline int mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
u16 regnum)
{
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -80,6 +80,7 @@ extern const int phy_10gbit_features_arr
#define PHY_IS_INTERNAL 0x00000001
#define PHY_RST_AFTER_CLK_EN 0x00000002
#define PHY_POLL_CABLE_TEST 0x00000004
+#define PHY_HAS_REALTEK_PAGES 0x00000010
#define MDIO_DEVICE_IS_PHY 0x80000000
/**
@@ -374,6 +375,22 @@ struct mii_bus {
/** @shared: shared state across different PHYs */
struct phy_package_shared *shared[PHY_MAX_ADDR];
+
+ /** @access_capabilities: hardware-assisted access capabilties */
+ enum {
+ MDIOBUS_ACCESS_SOFTWARE_ONLY = 0,
+ MDIOBUS_ACCESS_C22_MMD = 0x1,
+ } access_capabilities;
+
+ /** @read: Perform a read transfer on the bus, offloading page access */
+ int (*read_paged)(struct mii_bus *bus, int addr, u16 page, int regnum);
+ /** @write: Perform a write transfer on the bus, offloading page access */
+ int (*write_paged)(struct mii_bus *bus, int addr, u16 page, int regnum, u16 val);
+ /** currently selected page when page access is offloaded
+ * array should be PHY_MAX_ADDR+1size, but current design of the MDIO driver
+ * uses port addresses as phy addresses and they are up to 6 bit.
+ */
+ u16 selected_page[64];
};
#define to_mii_bus(d) container_of(d, struct mii_bus, dev)
@@ -1651,6 +1668,66 @@ static inline int __phy_package_read(str
return __mdiobus_read(phydev->mdio.bus, shared->addr, regnum);
}
+static inline int phy_package_read_port(struct phy_device *phydev, u16 port, u32 regnum)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return mdiobus_read(phydev->mdio.bus, shared->addr + port, regnum);
+}
+
+static inline int __phy_package_read_port(struct phy_device *phydev, u16 port, u32 regnum)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return __mdiobus_read(phydev->mdio.bus, shared->addr + port, regnum);
+}
+
+static inline int phy_package_read_paged(struct phy_device *phydev, u16 page, u32 regnum)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return mdiobus_read_paged(phydev->mdio.bus, shared->addr, page, regnum);
+}
+
+static inline int __phy_package_read_paged(struct phy_device *phydev, u16 page, u32 regnum)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return __mdiobus_read_paged(phydev->mdio.bus, shared->addr, page, regnum);
+}
+
+static inline int phy_package_port_read_paged(struct phy_device *phydev, u16 port, u16 page, u32 regnum)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return mdiobus_read_paged(phydev->mdio.bus, shared->addr + port, page, regnum);
+}
+
+static inline int __phy_package_port_read_paged(struct phy_device *phydev, u16 port, u16 page, u32 regnum)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return __mdiobus_read_paged(phydev->mdio.bus, shared->addr + port, page, regnum);
+}
+
static inline int phy_package_write(struct phy_device *phydev,
u32 regnum, u16 val)
{
@@ -1673,6 +1750,72 @@ static inline int __phy_package_write(st
return __mdiobus_write(phydev->mdio.bus, shared->addr, regnum, val);
}
+static inline int phy_package_port_write(struct phy_device *phydev,
+ u16 port, u32 regnum, u16 val)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return mdiobus_write(phydev->mdio.bus, shared->addr + port, regnum, val);
+}
+
+static inline int __phy_package_port_write(struct phy_device *phydev,
+ u16 port, u32 regnum, u16 val)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return __mdiobus_write(phydev->mdio.bus, shared->addr + port, regnum, val);
+}
+
+static inline int phy_package_port_write_paged(struct phy_device *phydev,
+ u16 port, u16 page, u32 regnum, u16 val)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return mdiobus_write_paged(phydev->mdio.bus, shared->addr + port, page, regnum, val);
+}
+
+static inline int __phy_package_port_write_paged(struct phy_device *phydev,
+ u16 port, u16 page, u32 regnum, u16 val)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return __mdiobus_write_paged(phydev->mdio.bus, shared->addr + port, page, regnum, val);
+}
+
+static inline int phy_package_write_paged(struct phy_device *phydev,
+ u16 page, u32 regnum, u16 val)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return mdiobus_write_paged(phydev->mdio.bus, shared->addr, page, regnum, val);
+}
+
+static inline int __phy_package_write_paged(struct phy_device *phydev,
+ u16 page, u32 regnum, u16 val)
+{
+ struct phy_package_shared *shared = phydev->shared;
+
+ if (!shared)
+ return -EIO;
+
+ return __mdiobus_write_paged(phydev->mdio.bus, shared->addr, page, regnum, val);
+}
+
static inline bool __phy_package_set_once(struct phy_device *phydev,
unsigned int b)
{
--- a/include/uapi/linux/mii.h
+++ b/include/uapi/linux/mii.h
@@ -36,6 +36,7 @@
#define MII_RESV2 0x1a /* Reserved... */
#define MII_TPISTATUS 0x1b /* TPI status for 10mbps */
#define MII_NCONFIG 0x1c /* Network interface config */
+#define MII_MAINPAGE 0x1f /* Page register */
/* Basic mode control register. */
#define BMCR_RESV 0x003f /* Unused... */
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