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d524dac927
The device tree is used by more than just PowerPC. Make the documentation
directory available to all.
v2: reorganized files while moving to create arch and driver specific
directories.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
149 lines
6.1 KiB
Plaintext
149 lines
6.1 KiB
Plaintext
4xx/Axon EMAC ethernet nodes
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The EMAC ethernet controller in IBM and AMCC 4xx chips, and also
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the Axon bridge. To operate this needs to interact with a ths
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special McMAL DMA controller, and sometimes an RGMII or ZMII
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interface. In addition to the nodes and properties described
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below, the node for the OPB bus on which the EMAC sits must have a
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correct clock-frequency property.
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i) The EMAC node itself
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Required properties:
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- device_type : "network"
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- compatible : compatible list, contains 2 entries, first is
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"ibm,emac-CHIP" where CHIP is the host ASIC (440gx,
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405gp, Axon) and second is either "ibm,emac" or
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"ibm,emac4". For Axon, thus, we have: "ibm,emac-axon",
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"ibm,emac4"
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- interrupts : <interrupt mapping for EMAC IRQ and WOL IRQ>
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- interrupt-parent : optional, if needed for interrupt mapping
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- reg : <registers mapping>
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- local-mac-address : 6 bytes, MAC address
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- mal-device : phandle of the associated McMAL node
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- mal-tx-channel : 1 cell, index of the tx channel on McMAL associated
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with this EMAC
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- mal-rx-channel : 1 cell, index of the rx channel on McMAL associated
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with this EMAC
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- cell-index : 1 cell, hardware index of the EMAC cell on a given
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ASIC (typically 0x0 and 0x1 for EMAC0 and EMAC1 on
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each Axon chip)
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- max-frame-size : 1 cell, maximum frame size supported in bytes
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- rx-fifo-size : 1 cell, Rx fifo size in bytes for 10 and 100 Mb/sec
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operations.
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For Axon, 2048
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- tx-fifo-size : 1 cell, Tx fifo size in bytes for 10 and 100 Mb/sec
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operations.
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For Axon, 2048.
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- fifo-entry-size : 1 cell, size of a fifo entry (used to calculate
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thresholds).
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For Axon, 0x00000010
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- mal-burst-size : 1 cell, MAL burst size (used to calculate thresholds)
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in bytes.
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For Axon, 0x00000100 (I think ...)
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- phy-mode : string, mode of operations of the PHY interface.
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Supported values are: "mii", "rmii", "smii", "rgmii",
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"tbi", "gmii", rtbi", "sgmii".
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For Axon on CAB, it is "rgmii"
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- mdio-device : 1 cell, required iff using shared MDIO registers
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(440EP). phandle of the EMAC to use to drive the
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MDIO lines for the PHY used by this EMAC.
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- zmii-device : 1 cell, required iff connected to a ZMII. phandle of
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the ZMII device node
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- zmii-channel : 1 cell, required iff connected to a ZMII. Which ZMII
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channel or 0xffffffff if ZMII is only used for MDIO.
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- rgmii-device : 1 cell, required iff connected to an RGMII. phandle
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of the RGMII device node.
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For Axon: phandle of plb5/plb4/opb/rgmii
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- rgmii-channel : 1 cell, required iff connected to an RGMII. Which
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RGMII channel is used by this EMAC.
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Fox Axon: present, whatever value is appropriate for each
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EMAC, that is the content of the current (bogus) "phy-port"
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property.
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Optional properties:
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- phy-address : 1 cell, optional, MDIO address of the PHY. If absent,
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a search is performed.
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- phy-map : 1 cell, optional, bitmap of addresses to probe the PHY
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for, used if phy-address is absent. bit 0x00000001 is
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MDIO address 0.
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For Axon it can be absent, though my current driver
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doesn't handle phy-address yet so for now, keep
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0x00ffffff in it.
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- rx-fifo-size-gige : 1 cell, Rx fifo size in bytes for 1000 Mb/sec
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operations (if absent the value is the same as
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rx-fifo-size). For Axon, either absent or 2048.
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- tx-fifo-size-gige : 1 cell, Tx fifo size in bytes for 1000 Mb/sec
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operations (if absent the value is the same as
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tx-fifo-size). For Axon, either absent or 2048.
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- tah-device : 1 cell, optional. If connected to a TAH engine for
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offload, phandle of the TAH device node.
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- tah-channel : 1 cell, optional. If appropriate, channel used on the
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TAH engine.
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Example:
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EMAC0: ethernet@40000800 {
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device_type = "network";
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compatible = "ibm,emac-440gp", "ibm,emac";
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interrupt-parent = <&UIC1>;
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interrupts = <1c 4 1d 4>;
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reg = <40000800 70>;
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local-mac-address = [00 04 AC E3 1B 1E];
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mal-device = <&MAL0>;
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mal-tx-channel = <0 1>;
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mal-rx-channel = <0>;
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cell-index = <0>;
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max-frame-size = <5dc>;
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rx-fifo-size = <1000>;
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tx-fifo-size = <800>;
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phy-mode = "rmii";
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phy-map = <00000001>;
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zmii-device = <&ZMII0>;
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zmii-channel = <0>;
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};
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ii) McMAL node
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Required properties:
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- device_type : "dma-controller"
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- compatible : compatible list, containing 2 entries, first is
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"ibm,mcmal-CHIP" where CHIP is the host ASIC (like
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emac) and the second is either "ibm,mcmal" or
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"ibm,mcmal2".
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For Axon, "ibm,mcmal-axon","ibm,mcmal2"
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- interrupts : <interrupt mapping for the MAL interrupts sources:
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5 sources: tx_eob, rx_eob, serr, txde, rxde>.
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For Axon: This is _different_ from the current
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firmware. We use the "delayed" interrupts for txeob
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and rxeob. Thus we end up with mapping those 5 MPIC
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interrupts, all level positive sensitive: 10, 11, 32,
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33, 34 (in decimal)
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- dcr-reg : < DCR registers range >
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- dcr-parent : if needed for dcr-reg
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- num-tx-chans : 1 cell, number of Tx channels
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- num-rx-chans : 1 cell, number of Rx channels
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iii) ZMII node
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Required properties:
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- compatible : compatible list, containing 2 entries, first is
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"ibm,zmii-CHIP" where CHIP is the host ASIC (like
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EMAC) and the second is "ibm,zmii".
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For Axon, there is no ZMII node.
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- reg : <registers mapping>
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iv) RGMII node
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Required properties:
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- compatible : compatible list, containing 2 entries, first is
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"ibm,rgmii-CHIP" where CHIP is the host ASIC (like
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EMAC) and the second is "ibm,rgmii".
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For Axon, "ibm,rgmii-axon","ibm,rgmii"
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- reg : <registers mapping>
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- revision : as provided by the RGMII new version register if
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available.
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For Axon: 0x0000012a
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