emifa.txt

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    1 External Memory Interface
    2 -------------------------
    3 
    4 The emifa node describes a simple external bus controller found on some C6X
    5 SoCs. This interface provides external busses with a number of chip selects.
    6 
    7 Required properties:
    8 
    9 - compatible: must be "ti,c64x+emifa", "simple-bus"
   10 - reg: register area base and size
   11 - #address-cells: must be 2 (chip-select + offset)
   12 - #size-cells: must be 1
   13 - ranges: mapping from EMIFA space to parent space
   14 
   15 
   16 Optional properties:
   17 
   18 - ti,dscr-dev-enable: Device ID if EMIF is enabled/disabled from DSCR
   19 
   20 - ti,emifa-burst-priority:
   21       Number of memory transfers after which the EMIF will elevate the priority
   22       of the oldest command in the command FIFO. Setting this field to 255
   23       disables this feature, thereby allowing old commands to stay in the FIFO
   24       indefinitely.
   25 
   26 - ti,emifa-ce-config:
   27       Configuration values for each of the supported chip selects.
   28 
   29 Example:
   30 
   31         emifa@70000000 {
   32                 compatible = "ti,c64x+emifa", "simple-bus";
   33                 #address-cells = <2>;
   34                 #size-cells = <1>;
   35                 reg = <0x70000000 0x100>;
   36                 ranges = <0x2 0x0 0xa0000000 0x00000008
   37                           0x3 0x0 0xb0000000 0x00400000
   38                           0x4 0x0 0xc0000000 0x10000000
   39                           0x5 0x0 0xD0000000 0x10000000>;
   40 
   41                 ti,dscr-dev-enable = <13>;
   42                 ti,emifa-burst-priority = <255>;
   43                 ti,emifa-ce-config = <0x00240120
   44                                       0x00240120
   45                                       0x00240122
   46                                       0x00240122>;
   47 
   48                 flash@3,0 {
   49                         #address-cells = <1>;
   50                         #size-cells = <1>;
   51                         compatible = "cfi-flash";
   52                         reg = <0x3 0x0 0x400000>;
   53                         bank-width = <1>;
   54                         device-width = <1>;
   55                         partition@0 {
   56                                 reg = <0x0 0x400000>;
   57                                 label = "NOR";
   58                         };
   59                 };
   60         };
   61 
   62 This shows a flash chip attached to chip select 3.

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/c6x/emifa.txt

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/c6x/emifa.txt