From 4e4aafcddbbfcdd6eed5780e190fcbfac8b4685a Mon Sep 17 00:00:00 2001 From: Andrew Lunn Date: Mon, 9 Jan 2023 16:30:41 +0100 Subject: net: mdio: Add dedicated C45 API to MDIO bus drivers Currently C22 and C45 transactions are mixed over a combined API calls which make use of a special bit in the reg address to indicate if a C45 transaction should be performed. This makes it impossible to know if the bus driver actually supports C45. Additionally, many C22 only drivers don't return -EOPNOTSUPP when asked to perform a C45 transaction, they mistaking perform a C22 transaction. This is the first step to cleanly separate C22 from C45. To maintain backwards compatibility until all drivers which are capable of performing C45 are converted to this new API, the helper functions will fall back to the older API if the new API is not supported. Eventually this fallback will be removed. Signed-off-by: Andrew Lunn Signed-off-by: Michael Walle Signed-off-by: Jakub Kicinski --- include/linux/mdio.h | 39 ++++++++++++++++++++------------------- include/linux/phy.h | 5 +++++ 2 files changed, 25 insertions(+), 19 deletions(-) (limited to 'include/linux') diff --git a/include/linux/mdio.h b/include/linux/mdio.h index f7fbbf3069e7..1e78c8410b21 100644 --- a/include/linux/mdio.h +++ b/include/linux/mdio.h @@ -423,6 +423,17 @@ int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set); int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set); +int __mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum); +int mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum); +int __mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum, + u16 val); +int mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum, + u16 val); +int mdiobus_c45_modify(struct mii_bus *bus, int addr, int devad, u32 regnum, + u16 mask, u16 set); + +int mdiobus_c45_modify_changed(struct mii_bus *bus, int addr, int devad, + u32 regnum, u16 mask, u16 set); static inline int mdiodev_read(struct mdio_device *mdiodev, u32 regnum) { @@ -463,29 +474,19 @@ static inline u16 mdiobus_c45_devad(u32 regnum) return FIELD_GET(MII_DEVADDR_C45_MASK, regnum); } -static inline int __mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad, - u16 regnum) +static inline int mdiodev_c45_modify(struct mdio_device *mdiodev, int devad, + u32 regnum, u16 mask, u16 set) { - return __mdiobus_read(bus, prtad, mdiobus_c45_addr(devad, regnum)); + return mdiobus_c45_modify(mdiodev->bus, mdiodev->addr, devad, regnum, + mask, set); } -static inline int __mdiobus_c45_write(struct mii_bus *bus, int prtad, int devad, - u16 regnum, u16 val) +static inline int mdiodev_c45_modify_changed(struct mdio_device *mdiodev, + int devad, u32 regnum, u16 mask, + u16 set) { - return __mdiobus_write(bus, prtad, mdiobus_c45_addr(devad, regnum), - val); -} - -static inline int mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad, - u16 regnum) -{ - return mdiobus_read(bus, prtad, mdiobus_c45_addr(devad, regnum)); -} - -static inline int mdiobus_c45_write(struct mii_bus *bus, int prtad, int devad, - u16 regnum, u16 val) -{ - return mdiobus_write(bus, prtad, mdiobus_c45_addr(devad, regnum), val); + return mdiobus_c45_modify_changed(mdiodev->bus, mdiodev->addr, devad, + regnum, mask, set); } static inline int mdiodev_c45_read(struct mdio_device *mdiodev, int devad, diff --git a/include/linux/phy.h b/include/linux/phy.h index 742754d72fc0..89b43cda5bda 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -364,6 +364,11 @@ struct mii_bus { int (*read)(struct mii_bus *bus, int addr, int regnum); /** @write: Perform a write transfer on the bus */ int (*write)(struct mii_bus *bus, int addr, int regnum, u16 val); + /** @read_c45: Perform a C45 read transfer on the bus */ + int (*read_c45)(struct mii_bus *bus, int addr, int devnum, int regnum); + /** @write_c45: Perform a C45 write transfer on the bus */ + int (*write_c45)(struct mii_bus *bus, int addr, int devnum, + int regnum, u16 val); /** @reset: Perform a reset of the bus */ int (*reset)(struct mii_bus *bus); -- cgit v1.2.3 From ce30fa56cbf09ab6b28170ced689c3cfd329e979 Mon Sep 17 00:00:00 2001 From: Andrew Lunn Date: Mon, 9 Jan 2023 16:30:45 +0100 Subject: net: mdio: Move mdiobus_c45_addr() next to users Now that mdiobus_c45_addr() is only used within the MDIO code during fallback, move the function next to its only users. This function should not be used any more in drivers, the c45 helpers should be used in its place, so hiding it away will prevent any new users from being added. Signed-off-by: Andrew Lunn Signed-off-by: Michael Walle Signed-off-by: Jakub Kicinski --- include/linux/mdio.h | 5 ----- 1 file changed, 5 deletions(-) (limited to 'include/linux') diff --git a/include/linux/mdio.h b/include/linux/mdio.h index 1e78c8410b21..97b49765e8b5 100644 --- a/include/linux/mdio.h +++ b/include/linux/mdio.h @@ -459,11 +459,6 @@ static inline int mdiodev_modify_changed(struct mdio_device *mdiodev, mask, set); } -static inline u32 mdiobus_c45_addr(int devad, u16 regnum) -{ - return MII_ADDR_C45 | devad << MII_DEVADDR_C45_SHIFT | regnum; -} - static inline u16 mdiobus_c45_regad(u32 regnum) { return FIELD_GET(MII_REGADDR_C45_MASK, regnum); -- cgit v1.2.3 From 002dd3de097c778a74ae9e47e598bea6ad055af0 Mon Sep 17 00:00:00 2001 From: Andrew Lunn Date: Mon, 9 Jan 2023 16:30:46 +0100 Subject: net: mdio: mdio-bitbang: Separate C22 and C45 transactions The bitbbanging bus driver can perform both C22 and C45 transfers. Create separate functions for each and register the C45 versions using the new driver API calls. The SH Ethernet driver places wrappers around these functions. In order to not break boards which might be using C45, add similar wrappers for C45 operations. Reviewed-by: Geert Uytterhoeven Signed-off-by: Andrew Lunn Signed-off-by: Michael Walle Signed-off-by: Jakub Kicinski --- include/linux/mdio-bitbang.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/mdio-bitbang.h b/include/linux/mdio-bitbang.h index 373630fe5c28..cffabdbce075 100644 --- a/include/linux/mdio-bitbang.h +++ b/include/linux/mdio-bitbang.h @@ -38,8 +38,10 @@ struct mdiobb_ctrl { u8 op_c22_write; }; -int mdiobb_read(struct mii_bus *bus, int phy, int reg); -int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val); +int mdiobb_read_c22(struct mii_bus *bus, int phy, int reg); +int mdiobb_write_c22(struct mii_bus *bus, int phy, int reg, u16 val); +int mdiobb_read_c45(struct mii_bus *bus, int devad, int phy, int reg); +int mdiobb_write_c45(struct mii_bus *bus, int devad, int phy, int reg, u16 val); /* The returned bus is not yet registered with the phy layer. */ struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl); -- cgit v1.2.3 From 1d914d51f03cbbbda3c34c675e49392ce60c1c33 Mon Sep 17 00:00:00 2001 From: Andrew Lunn Date: Mon, 9 Jan 2023 16:30:50 +0100 Subject: net: mdio: add mdiobus_c45_read/write_nested helpers Some DSA devices pass through PHY access to the MDIO bus the switch is on. Add C45 versions of the current C22 helpers for nested accesses to MDIO busses, so that C22 and C45 can be separated in these DSA drivers. Signed-off-by: Andrew Lunn Signed-off-by: Michael Walle Signed-off-by: Jakub Kicinski --- include/linux/mdio.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux') diff --git a/include/linux/mdio.h b/include/linux/mdio.h index 97b49765e8b5..220f3ca8702d 100644 --- a/include/linux/mdio.h +++ b/include/linux/mdio.h @@ -425,10 +425,14 @@ int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set); int __mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum); int mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum); +int mdiobus_c45_read_nested(struct mii_bus *bus, int addr, int devad, + u32 regnum); int __mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum, u16 val); int mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum, u16 val); +int mdiobus_c45_write_nested(struct mii_bus *bus, int addr, int devad, + u32 regnum, u16 val); int mdiobus_c45_modify(struct mii_bus *bus, int addr, int devad, u32 regnum, u16 mask, u16 set); -- cgit v1.2.3