Documentation/devicetree/bindings/powerpc/fsl/srio-rmu.txt

   1 Message unit node:
   2
   3 For SRIO controllers that implement the message unit as part of the controller
   4 this node is required.  For devices with RMAN this node should NOT exist.  The
   5 node is composed of three types of sub-nodes ("fsl-srio-msg-unit",
   6 "fsl-srio-dbell-unit" and "fsl-srio-port-write-unit").
   7
   8 See srio.txt for more details about generic SRIO controller details.
   9
  10    - compatible
  11         Usage: required
  12         Value type: <string>
  13         Definition: Must include "fsl,srio-rmu-vX.Y", "fsl,srio-rmu".
  14
  15         The version X.Y should match the general SRIO controller's IP Block
  16         revision register's Major(X) and Minor (Y) value.
  17
  18    - reg
  19         Usage: required
  20         Value type: <prop-encoded-array>
  21         Definition: A standard property.  Specifies the physical address and
  22                 length of the SRIO configuration registers for message units
  23                 and doorbell units.
  24
  25    - fsl,liodn
  26         Usage: optional-but-recommended (for devices with PAMU)
  27         Value type: <prop-encoded-array>
  28         Definition: The logical I/O device number for the PAMU (IOMMU) to be
  29                 correctly configured for SRIO accesses.  The property should
  30                 not exist on devices that do not support PAMU.
  31
  32                 The LIODN value is associated with all RMU transactions
  33                 (msg-unit, doorbell, port-write).
  34
  35 Sub-Nodes for RMU:  The RMU node is composed of multiple sub-nodes that
  36 correspond to the actual sub-controllers in the RMU.  The manual for a given
  37 SoC will detail which and how many of these sub-controllers are implemented.
  38
  39 Message Unit:
  40
  41    - compatible
  42         Usage: required
  43         Value type: <string>
  44         Definition: Must include "fsl,srio-msg-unit-vX.Y", "fsl,srio-msg-unit".
  45
  46         The version X.Y should match the general SRIO controller's IP Block
  47         revision register's Major(X) and Minor (Y) value.
  48
  49    - reg
  50         Usage: required
  51         Value type: <prop-encoded-array>
  52         Definition: A standard property.  Specifies the physical address and
  53                 length of the SRIO configuration registers for message units
  54                 and doorbell units.
  55
  56    - interrupts
  57         Usage: required
  58         Value type: <prop_encoded-array>
  59         Definition:  Specifies the interrupts generated by this device.  The
  60                 value of the interrupts property consists of one interrupt
  61                 specifier. The format of the specifier is defined by the
  62                 binding document describing the node's interrupt parent.
  63
  64                 A pair of IRQs are specified in this property.  The first
  65                 element is associated with the transmit (TX) interrupt and the
  66                 second element is associated with the receive (RX) interrupt.
  67
  68 Doorbell Unit:
  69
  70    - compatible
  71         Usage: required
  72         Value type: <string>
  73         Definition: Must include:
  74                 "fsl,srio-dbell-unit-vX.Y", "fsl,srio-dbell-unit"
  75
  76         The version X.Y should match the general SRIO controller's IP Block
  77         revision register's Major(X) and Minor (Y) value.
  78
  79    - reg
  80         Usage: required
  81         Value type: <prop-encoded-array>
  82         Definition: A standard property.  Specifies the physical address and
  83                 length of the SRIO configuration registers for message units
  84                 and doorbell units.
  85
  86    - interrupts
  87         Usage: required
  88         Value type: <prop_encoded-array>
  89         Definition:  Specifies the interrupts generated by this device.  The
  90                 value of the interrupts property consists of one interrupt
  91                 specifier. The format of the specifier is defined by the
  92                 binding document describing the node's interrupt parent.
  93
  94                 A pair of IRQs are specified in this property.  The first
  95                 element is associated with the transmit (TX) interrupt and the
  96                 second element is associated with the receive (RX) interrupt.
  97
  98 Port-Write Unit:
  99
 100    - compatible
 101         Usage: required
 102         Value type: <string>
 103         Definition: Must include:
 104                  "fsl,srio-port-write-unit-vX.Y", "fsl,srio-port-write-unit"
 105
 106         The version X.Y should match the general SRIO controller's IP Block
 107         revision register's Major(X) and Minor (Y) value.
 108
 109    - reg
 110         Usage: required
 111         Value type: <prop-encoded-array>
 112         Definition: A standard property.  Specifies the physical address and
 113                 length of the SRIO configuration registers for message units
 114                 and doorbell units.
 115
 116    - interrupts
 117         Usage: required
 118         Value type: <prop_encoded-array>
 119         Definition:  Specifies the interrupts generated by this device.  The
 120                 value of the interrupts property consists of one interrupt
 121                 specifier. The format of the specifier is defined by the
 122                 binding document describing the node's interrupt parent.
 123
 124                 A single IRQ that handles port-write conditions is
 125                 specified by this property.  (Typically shared with error).
 126
 127    Note: All other standard properties (see the ePAPR) are allowed
 128    but are optional.
 129
 130 Example:
 131         rmu: rmu@d3000 {
 132                 compatible = "fsl,srio-rmu";
 133                 reg = <0xd3000 0x400>;
 134                 ranges = <0x0 0xd3000 0x400>;
 135                 fsl,liodn = <0xc8>;
 136
 137                 message-unit@0 {
 138                         compatible = "fsl,srio-msg-unit";
 139                         reg = <0x0 0x100>;
 140                         interrupts = <
 141                                 60 2 0 0  /* msg1_tx_irq */
 142                                 61 2 0 0>;/* msg1_rx_irq */
 143                 };
 144                 message-unit@100 {
 145                         compatible = "fsl,srio-msg-unit";
 146                         reg = <0x100 0x100>;
 147                         interrupts = <
 148                                 62 2 0 0  /* msg2_tx_irq */
 149                                 63 2 0 0>;/* msg2_rx_irq */
 150                 };
 151                 doorbell-unit@400 {
 152                         compatible = "fsl,srio-dbell-unit";
 153                         reg = <0x400 0x80>;
 154                         interrupts = <
 155                                 56 2 0 0  /* bell_outb_irq */
 156                                 57 2 0 0>;/* bell_inb_irq */
 157                 };
 158                 port-write-unit@4e0 {
 159                         compatible = "fsl,srio-port-write-unit";
 160                         reg = <0x4e0 0x20>;
 161                         interrupts = <16 2 1 11>;
 162                 };
 163         };