1C6X Interrupt Chips 2------------------- 3 4* C64X+ Core Interrupt Controller 5 6 The core interrupt controller provides 16 prioritized interrupts to the 7 C64X+ core. Priority 0 and 1 are used for reset and NMI respectively. 8 Priority 2 and 3 are reserved. Priority 4-15 are used for interrupt 9 sources coming from outside the core. 10 11 Required properties: 12 -------------------- 13 - compatible: Should be "ti,c64x+core-pic"; 14 - #interrupt-cells: <1> 15 16 Interrupt Specifier Definition 17 ------------------------------ 18 Single cell specifying the core interrupt priority level (4-15) where 19 4 is highest priority and 15 is lowest priority. 20 21 Example 22 ------- 23 core_pic: interrupt-controller@0 { 24 interrupt-controller; 25 #interrupt-cells = <1>; 26 compatible = "ti,c64x+core-pic"; 27 }; 28 29 30 31* C64x+ Megamodule Interrupt Controller 32 33 The megamodule PIC consists of four interrupt mupliplexers each of which 34 combine up to 32 interrupt inputs into a single interrupt output which 35 may be cascaded into the core interrupt controller. The megamodule PIC 36 has a total of 12 outputs cascading into the core interrupt controller. 37 One for each core interrupt priority level. In addition to the combined 38 interrupt sources, individual megamodule interrupts may be cascaded to 39 the core interrupt controller. When an individual interrupt is cascaded, 40 it is no longer handled through a megamodule interrupt combiner and is 41 considered to have the core interrupt controller as the parent. 42 43 Required properties: 44 -------------------- 45 - compatible: "ti,c64x+megamod-pic" 46 - interrupt-controller 47 - #interrupt-cells: <1> 48 - reg: base address and size of register area 49 - interrupts: This should have four cells; one for each interrupt combiner. 50 The cells contain the core priority interrupt to which the 51 corresponding combiner output is wired. 52 53 Optional properties: 54 -------------------- 55 - ti,c64x+megamod-pic-mux: Array of 12 cells correspnding to the 12 core 56 priority interrupts. The first cell corresponds to 57 core priority 4 and the last cell corresponds to 58 core priority 15. The value of each cell is the 59 megamodule interrupt source which is MUXed to 60 the core interrupt corresponding to the cell 61 position. Allowed values are 4 - 127. Mapping for 62 interrupts 0 - 3 (combined interrupt sources) are 63 ignored. 64 65 Interrupt Specifier Definition 66 ------------------------------ 67 Single cell specifying the megamodule interrupt source (4-127). Note that 68 interrupts mapped directly to the core with "ti,c64x+megamod-pic-mux" will 69 use the core interrupt controller as their parent and the specifier will 70 be the core priority level, not the megamodule interrupt number. 71 72 Examples 73 -------- 74 megamod_pic: interrupt-controller@1800000 { 75 compatible = "ti,c64x+megamod-pic"; 76 interrupt-controller; 77 #interrupt-cells = <1>; 78 reg = <0x1800000 0x1000>; 79 interrupt-parent = <&core_pic>; 80 interrupts = < 12 13 14 15 >; 81 }; 82 83 This is a minimal example where all individual interrupts go through a 84 combiner. Combiner-0 is mapped to core interrupt 12, combiner-1 is mapped 85 to interrupt 13, etc. 86 87 88 megamod_pic: interrupt-controller@1800000 { 89 compatible = "ti,c64x+megamod-pic"; 90 interrupt-controller; 91 #interrupt-cells = <1>; 92 reg = <0x1800000 0x1000>; 93 interrupt-parent = <&core_pic>; 94 interrupts = < 12 13 14 15 >; 95 ti,c64x+megamod-pic-mux = < 0 0 0 0 96 32 0 0 0 97 0 0 0 0 >; 98 }; 99 100 This the same as the first example except that megamodule interrupt 32 is 101 mapped directly to core priority interrupt 8. The node using this interrupt 102 must set the core controller as its interrupt parent and use 8 in the 103 interrupt specifier value. 104