All registers in the mac and phy units can be managed thr ough the spi interface. In this case, how should i work out a generic phy driver to handle this. This patch is to add support for the hardware with multiple ethernet mac controllers and a single mdio bus connected to multiple phy devices. The problem is that the am335x does not support clause 45 mdio access2. Lan95xx usb to ethernet, how to use an external phy on linux. Im trying to write a userspace app to access devices on an mii management bus mdio mdc associated with an ethernet controller. Usually, the serial management interface smi using mdc and mdio is used to access the phys internal registers to read the state of the link updown, duplex mode, speed, and.
There seems to be no direct userspace interface to an mdio bus. There is no change required if there only one phy on the mdio bus. Dealing with multiple phys on an mdio bus community forums. We connected only kr interface of cpu and x557at2 on main board since our mdio and interrupt pins of cpu are not routed to the vpx connector. The interface requires 18 signals, out of which only two mdio and mdc can be shared among multiple phys. Im trying to write a userspace app to access devices on an mii management bus mdiomdc associated with an ethernet controller. From the other hand, when i am running davinci with mdiomdc in muxmode0, the bitbang driver is muted. Page 5 of 22 enable external oe allows to split the mdio bidirectional in. Contribute to pievomdio tool development by creating an account on github. The two lines include the mdc line management data clock, and the mdio line management data inputoutput. Besides the data interface, a twowire management interface mdio is defined to connect mac. The ethernet phy supported by the darsena development board is the texas instruments dp83867. From the ethernet mac to the link partner linux foundation events. If the interface is configured as rmii, the code fails to configure the smi mdc mdio pins.
Integrated 4port 10100 managed ethernet switch with. The driver controls the mac controller by writingreading its memorymapped registers mmrs. The miim is also known as the mdiomdc interface and is typically supported by ethernet phy products industry wide. Miim phy registers can be accessed through the mdcmdio interface. Hello, and welcome to this presentation of the stm32 management. To meet the needs the expanding needs of 10gigabit ethernet devices, clause 45 of the. May 15, 2017 smsc9500 driver supports an external phy. The pin mux tables contain incorrect mux data for ethernet for some pins. I want to access the registers of this device from the user space. The designware ethernet ip solutions consist of configurable controllers and siliconproven phys supporting speeds of up to 100g, verification ip, ip prototyping kits, software development kits and interface ip subsystems. Linux drivers for texas instruments ethernet physical layer phy transceivers support communication through the serial management interface mdcmdio. Following is the definition of the probe function in the standard gpio based mdio bitbang driver.
Dropin module for spartan6, virtex7, artix7, kintex7 and zynq xilinx fpgas. I think this is because the macb driver still doesnt know about the mdio bus access for the other gems the mdio access is on gem3 so, when the other gems phys are probed, the device id cannot be read, and comes back as 1. The ksz8567 is a fully integrated layer 2, managed, sevenport 10100 ethernet switch with numerous advanced features, designed to exceed automotive aecq100 grade 2. Ethernet phy configuration using mdio for industrial. Configuring sgmii ethernet on the powerquicc mpc83e processor, rev. Ethernet phy configuration using mdio for industrial applications. Typically an mdio bus is used between the ethernet mac and the. Ethernet mdio mmd design for fpga open source network. Our soc, cygnus, uses a generic mdc mdio controller to talk to various phys, including 2 x ethernet gphy, 2 x pcie serdes, and 3 x usb phys. Ethernet phy configuration using mdio for industrial applications 3 phy speed, duplex, and more after the phy is reset, it can be configured using the mdio for the desired operation mode. A robust assortment of power management features including energy efficient ethernet eee, pme, and wol have been designed in to satisfy energy efficient environments. Ksz8795 interface and networking ethernet switches. How to access non ethernet phy device register over mdio bus.
Integrated 4port 10100 managed ethernet switch with gigabit. The ethernet fec driver exposes device data through the sysfs at sysclassnetethx. If the interface is configured as rmii, the code fails to configure the smi mdcmdio pins. The linux drivers for texas instruments ethernet physical layer phy transceivers support communication through the serial management interface mdc mdio to configure and read phy registers. This chip is complete configurable via spi and we dont use mdiomdc lines for communication. It seems like the physical mdio bus driver finds the switch but how do i talk to it. In the linux system, the ethernet interfaces are known as ethx where x is a number, starting at 0, that indicates the interface index. Management data inputoutput mdio, also known as serial management interface smi or media independent interface management miim, is a serial bus defined for the ethernet family of ieee 802. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. The mdio interface is a simple, twowire, serial interface, clock and data.
As the phy device is not an ethenet phy i am a bit confused. Do i create a fake ethernet device whose only purpose is to access the mdio bus or do i somehow attach it to the ethernet device which will then have two mdio busses attached. Smi is a serial bus, which allows to connect up to 32 devices. This device is considered the mdio manageable device mmd. Mdio history management data inputoutput, or mdio, is a 2wire serial bus that is used to manage phys or physical layer devices in media access controllers macs in gigabit ethernet equipment. Our soc, cygnus, uses a generic mdcmdio controller to talk to various phys, including 2 x ethernet gphy, 2 x pcie serdes, and 3 x usb phys. Ksz8775 phy modetwo pic32mxrmiihow to share miimmdio. Configuring sgmii ethernet on the powerquicc mpc83e.
Phy registers by connecting the serial management bus signals mdc and mdio to gpios. A robust assortment of powermanagement features including energyefficient ethernet eee, pme, and wakeonlan wol have been designedin to satisfy energyefficient environments. It uses new readwrite routines to write to the mii registers mapped on the local etsec mdio bus. Mdio master core for actel fpgas product brief version 1.
Im working on a custom board where i have an am335x with an mdiomdc bus connected to a gigabit ethernet phy marvell 88e1510 and a 10gigabit ethernet phy marvell 88x2222p. The purpose of the bus is configure, control, and obtain status of each phy e. Miim phy registers can be accessed through the mdc mdio interface. The first two of the 32 phy registers, the control register register 0 and the. Management data inputoutput mdio, also known as serial management interface smi or media independent interface management miim, is a serial bus defined for the ethernet family of. Am335x implementing mdio bitbang driver for clause 45. The usb2mdio software tool lets texas instruments ethernet phys access the mdio status and device control registers. How to disable mdc clock when not accessing the ph. Psoc output driver is open drain, so voh is determined by pullup resistor on the mdio bus. We are using as a driver intel ethernet adapter complete driver pack, v23. Sending seems to be working, i receive frames but no good one, all have runt or rxalign errors. It also manages the phy by commanding the mac controller to writeread the 32 phy registers via the mii management data exchange channel. The mdio controller in turn controls the mdio driver to perform mdio communication with the gigabit ethernet phys. Im using code copied from miitool, but the method used by miitool to override the phy id doesnt seem to work.
So if the smi interface is not working, the pin mux table for the pins you are using must be manually. The mdio within the pruicss in amic110 implements the 802. The mii connects media access control mac devices with ethernet physical layer phy circuits. Via the 2 gpio dip switches and the center gpio push button sw to register the change in speed buttons.
How to connect an ethernet device directly to a switch in. After calling an ioctl to fill in the miiphy details in the. Copenhagen, denmark sept 1719, 2001 may 4, 2000ieee p802. Linux macb mdio support for single mac managing multiple phys. Interesting, i have typically seen separate mdio controllers for at least ethernet and usbpciesata. Psoc creator component datasheet mdio interface document number. We try to all our prototype boards 5 of 5 and we cannot see the ethernet connection. The usb2mdio software lets you directly access the registers during debug and prototyping. Usually, the serial management interface smi using mdc and mdio is used to access the phys internal registers to read the state of the link updown, duplex mode, speed, and to restart autonegotiation etc. Psoc creator component datasheet mdio interface features.
The xgmac ip also provides mdio interface capable of addressing mdio devices that comply with the ieee 802. Heres a list of bugs i have found in the illd ethernet driver. The usb2mdio tool includes a launchpad development kit for tis msp430 mcus that is interfaced with a lightweight gui. Mdio is used to connect a management entity and a managed phy for the purposes of controlling the phy and gathering status from the phy. Im working on a custom board where i have an am335x with an mdio mdc bus connected to a gigabit ethernet phy marvell 88e1510 and a 10gigabit ethernet phy marvell 88x2222p. Mdc clocks to copy the data before the mdio host can read. From the other hand, when i am running davinci with mdio mdc in muxmode0, the bitbang driver is muted. I have a non ethernet phy device connected to the mdio bus.
Ethernet mdio mmd design for fpga open source network processor. May, 2016 this patch is to add support for the hardware with multiple ethernet mac controllers and a single mdio bus connected to multiple phy devices. I am using a buildroot1 system with linux kernel 4. I think this is because the macb driver still doesnt know about the mdio bus access for the other gems the mdio access is on gem3 so, when the other gems phys are probed, the device id cannot be read, and comes back as. The ethernet mac controller is driven by an ethernet driver. Secondly when is the probe function called by the driver. The mvd mdio sta management interface is a dropin module for an easy control of the ethernet phy writing or reading phy registers. We want to disable the mdc mdio interface clock when the mdio bus is not in use most of. Im bothering about microchip tcpip stack ethernet mac driver and miim driver. The mdio controller in turn controls the mdio driver mdio. All registers in the mac and phy units can be managed through the spi interface. Mdio lines are connected to any one of the ethernet mac controllers and all the phy devices will be accessed using the phy maintenance interface in that mac controller. Mdio a bidirectional data line and mdc a clock line.
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