Based on kernel version 2.6.37. Page generated on 2011-03-22 21:57 EST.
1 4xx/Axon EMAC ethernet nodes 2 3 The EMAC ethernet controller in IBM and AMCC 4xx chips, and also 4 the Axon bridge. To operate this needs to interact with a ths 5 special McMAL DMA controller, and sometimes an RGMII or ZMII 6 interface. In addition to the nodes and properties described 7 below, the node for the OPB bus on which the EMAC sits must have a 8 correct clock-frequency property. 9 10 i) The EMAC node itself 11 12 Required properties: 13 - device_type : "network" 14 15 - compatible : compatible list, contains 2 entries, first is 16 "ibm,emac-CHIP" where CHIP is the host ASIC (440gx, 17 405gp, Axon) and second is either "ibm,emac" or 18 "ibm,emac4". For Axon, thus, we have: "ibm,emac-axon", 19 "ibm,emac4" 20 - interrupts : <interrupt mapping for EMAC IRQ and WOL IRQ> 21 - interrupt-parent : optional, if needed for interrupt mapping 22 - reg : <registers mapping> 23 - local-mac-address : 6 bytes, MAC address 24 - mal-device : phandle of the associated McMAL node 25 - mal-tx-channel : 1 cell, index of the tx channel on McMAL associated 26 with this EMAC 27 - mal-rx-channel : 1 cell, index of the rx channel on McMAL associated 28 with this EMAC 29 - cell-index : 1 cell, hardware index of the EMAC cell on a given 30 ASIC (typically 0x0 and 0x1 for EMAC0 and EMAC1 on 31 each Axon chip) 32 - max-frame-size : 1 cell, maximum frame size supported in bytes 33 - rx-fifo-size : 1 cell, Rx fifo size in bytes for 10 and 100 Mb/sec 34 operations. 35 For Axon, 2048 36 - tx-fifo-size : 1 cell, Tx fifo size in bytes for 10 and 100 Mb/sec 37 operations. 38 For Axon, 2048. 39 - fifo-entry-size : 1 cell, size of a fifo entry (used to calculate 40 thresholds). 41 For Axon, 0x00000010 42 - mal-burst-size : 1 cell, MAL burst size (used to calculate thresholds) 43 in bytes. 44 For Axon, 0x00000100 (I think ...) 45 - phy-mode : string, mode of operations of the PHY interface. 46 Supported values are: "mii", "rmii", "smii", "rgmii", 47 "tbi", "gmii", rtbi", "sgmii". 48 For Axon on CAB, it is "rgmii" 49 - mdio-device : 1 cell, required iff using shared MDIO registers 50 (440EP). phandle of the EMAC to use to drive the 51 MDIO lines for the PHY used by this EMAC. 52 - zmii-device : 1 cell, required iff connected to a ZMII. phandle of 53 the ZMII device node 54 - zmii-channel : 1 cell, required iff connected to a ZMII. Which ZMII 55 channel or 0xffffffff if ZMII is only used for MDIO. 56 - rgmii-device : 1 cell, required iff connected to an RGMII. phandle 57 of the RGMII device node. 58 For Axon: phandle of plb5/plb4/opb/rgmii 59 - rgmii-channel : 1 cell, required iff connected to an RGMII. Which 60 RGMII channel is used by this EMAC. 61 Fox Axon: present, whatever value is appropriate for each 62 EMAC, that is the content of the current (bogus) "phy-port" 63 property. 64 65 Optional properties: 66 - phy-address : 1 cell, optional, MDIO address of the PHY. If absent, 67 a search is performed. 68 - phy-map : 1 cell, optional, bitmap of addresses to probe the PHY 69 for, used if phy-address is absent. bit 0x00000001 is 70 MDIO address 0. 71 For Axon it can be absent, though my current driver 72 doesn't handle phy-address yet so for now, keep 73 0x00ffffff in it. 74 - rx-fifo-size-gige : 1 cell, Rx fifo size in bytes for 1000 Mb/sec 75 operations (if absent the value is the same as 76 rx-fifo-size). For Axon, either absent or 2048. 77 - tx-fifo-size-gige : 1 cell, Tx fifo size in bytes for 1000 Mb/sec 78 operations (if absent the value is the same as 79 tx-fifo-size). For Axon, either absent or 2048. 80 - tah-device : 1 cell, optional. If connected to a TAH engine for 81 offload, phandle of the TAH device node. 82 - tah-channel : 1 cell, optional. If appropriate, channel used on the 83 TAH engine. 84 85 Example: 86 87 EMAC0: ethernet@40000800 { 88 device_type = "network"; 89 compatible = "ibm,emac-440gp", "ibm,emac"; 90 interrupt-parent = <&UIC1>; 91 interrupts = <1c 4 1d 4>; 92 reg = <40000800 70>; 93 local-mac-address = [00 04 AC E3 1B 1E]; 94 mal-device = <&MAL0>; 95 mal-tx-channel = <0 1>; 96 mal-rx-channel = <0>; 97 cell-index = <0>; 98 max-frame-size = <5dc>; 99 rx-fifo-size = <1000>; 100 tx-fifo-size = <800>; 101 phy-mode = "rmii"; 102 phy-map = <00000001>; 103 zmii-device = <&ZMII0>; 104 zmii-channel = <0>; 105 }; 106 107 ii) McMAL node 108 109 Required properties: 110 - device_type : "dma-controller" 111 - compatible : compatible list, containing 2 entries, first is 112 "ibm,mcmal-CHIP" where CHIP is the host ASIC (like 113 emac) and the second is either "ibm,mcmal" or 114 "ibm,mcmal2". 115 For Axon, "ibm,mcmal-axon","ibm,mcmal2" 116 - interrupts : <interrupt mapping for the MAL interrupts sources: 117 5 sources: tx_eob, rx_eob, serr, txde, rxde>. 118 For Axon: This is _different_ from the current 119 firmware. We use the "delayed" interrupts for txeob 120 and rxeob. Thus we end up with mapping those 5 MPIC 121 interrupts, all level positive sensitive: 10, 11, 32, 122 33, 34 (in decimal) 123 - dcr-reg : < DCR registers range > 124 - dcr-parent : if needed for dcr-reg 125 - num-tx-chans : 1 cell, number of Tx channels 126 - num-rx-chans : 1 cell, number of Rx channels 127 128 iii) ZMII node 129 130 Required properties: 131 - compatible : compatible list, containing 2 entries, first is 132 "ibm,zmii-CHIP" where CHIP is the host ASIC (like 133 EMAC) and the second is "ibm,zmii". 134 For Axon, there is no ZMII node. 135 - reg : <registers mapping> 136 137 iv) RGMII node 138 139 Required properties: 140 - compatible : compatible list, containing 2 entries, first is 141 "ibm,rgmii-CHIP" where CHIP is the host ASIC (like 142 EMAC) and the second is "ibm,rgmii". 143 For Axon, "ibm,rgmii-axon","ibm,rgmii" 144 - reg : <registers mapping> 145 - revision : as provided by the RGMII new version register if 146 available. 147 For Axon: 0x0000012a