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-=====================================================================
-Freescale MPIC Interrupt Controller Node
-Copyright (C) 2010,2011 Freescale Semiconductor Inc.
-=====================================================================
-
-The Freescale MPIC interrupt controller is found on all PowerQUICC
-and QorIQ processors and is compatible with the Open PIC. The
-notable difference from Open PIC binding is the addition of 2
-additional cells in the interrupt specifier defining interrupt type
-information.
-
-PROPERTIES
-
- - compatible
- Usage: required
- Value type: <string>
- Definition: Shall include "fsl,mpic". Freescale MPIC
- controllers compatible with this binding have Block
- Revision Registers BRR1 and BRR2 at offset 0x0 and
- 0x10 in the MPIC.
-
- - reg
- Usage: required
- Value type: <prop-encoded-array>
- Definition: A standard property. Specifies the physical
- offset and length of the device's registers within the
- CCSR address space.
-
- - interrupt-controller
- Usage: required
- Value type: <empty>
- Definition: Specifies that this node is an interrupt
- controller
-
- - #interrupt-cells
- Usage: required
- Value type: <u32>
- Definition: Shall be 2 or 4. A value of 2 means that interrupt
- specifiers do not contain the interrupt-type or type-specific
- information cells.
-
- - #address-cells
- Usage: required
- Value type: <u32>
- Definition: Shall be 0.
-
- - pic-no-reset
- Usage: optional
- Value type: <empty>
- Definition: The presence of this property specifies that the
- MPIC must not be reset by the client program, and that
- the boot program has initialized all interrupt source
- configuration registers to a sane state-- masked or
- directed at other cores. This ensures that the client
- program will not receive interrupts for sources not belonging
- to the client. The presence of this property also mandates
- that any initialization related to interrupt sources shall
- be limited to sources explicitly referenced in the device tree.
-
- - big-endian
- Usage: optional
- Value type: <empty>
- If present the MPIC will be assumed to be big-endian. Some
- device-trees omit this property on MPIC nodes even when the MPIC is
- in fact big-endian, so certain boards override this property.
-
- - single-cpu-affinity
- Usage: optional
- Value type: <empty>
- If present the MPIC will be assumed to only be able to route
- non-IPI interrupts to a single CPU at a time (EG: Freescale MPIC).
-
- - last-interrupt-source
- Usage: optional
- Value type: <u32>
- Some MPICs do not correctly report the number of hardware sources
- in the global feature registers. If specified, this field will
- override the value read from MPIC_GREG_FEATURE_LAST_SRC.
-
-INTERRUPT SPECIFIER DEFINITION
-
- Interrupt specifiers consists of 4 cells encoded as
- follows:
-
- <1st-cell> interrupt-number
-
- Identifies the interrupt source. The meaning
- depends on the type of interrupt.
-
- Note: If the interrupt-type cell is undefined
- (i.e. #interrupt-cells = 2), this cell
- should be interpreted the same as for
- interrupt-type 0-- i.e. an external or
- normal SoC device interrupt.
-
- <2nd-cell> level-sense information, encoded as follows:
- 0 = low-to-high edge triggered
- 1 = active low level-sensitive
- 2 = active high level-sensitive
- 3 = high-to-low edge triggered
-
- <3rd-cell> interrupt-type
-
- The following types are supported:
-
- 0 = external or normal SoC device interrupt
-
- The interrupt-number cell contains
- the SoC device interrupt number. The
- type-specific cell is undefined. The
- interrupt-number is derived from the
- MPIC a block of registers referred to as
- the "Interrupt Source Configuration Registers".
- Each source has 32-bytes of registers
- (vector/priority and destination) in this
- region. So interrupt 0 is at offset 0x0,
- interrupt 1 is at offset 0x20, and so on.
-
- 1 = error interrupt
-
- The interrupt-number cell contains
- the SoC device interrupt number for
- the error interrupt. The type-specific
- cell identifies the specific error
- interrupt number.
-
- 2 = MPIC inter-processor interrupt (IPI)
-
- The interrupt-number cell identifies
- the MPIC IPI number. The type-specific
- cell is undefined.
-
- 3 = MPIC timer interrupt
-
- The interrupt-number cell identifies
- the MPIC timer number. The type-specific
- cell is undefined.
-
- <4th-cell> type-specific information
-
- The type-specific cell is encoded as follows:
-
- - For interrupt-type 1 (error interrupt),
- the type-specific cell contains the
- bit number of the error interrupt in the
- Error Interrupt Summary Register.
-
-EXAMPLE 1
- /*
- * mpic interrupt controller with 4 cells per specifier
- */
- mpic: pic@40000 {
- compatible = "fsl,mpic";
- interrupt-controller;
- #interrupt-cells = <4>;
- #address-cells = <0>;
- reg = <0x40000 0x40000>;
- };
-
-EXAMPLE 2
- /*
- * The MPC8544 I2C controller node has an internal
- * interrupt number of 27. As per the reference manual
- * this corresponds to interrupt source configuration
- * registers at 0x5_0560.
- *
- * The interrupt source configuration registers begin
- * at 0x5_0000.
- *
- * To compute the interrupt specifier interrupt number
- *
- * 0x560 >> 5 = 43
- *
- * The interrupt source configuration registers begin
- * at 0x5_0000, and so the i2c vector/priority registers
- * are at 0x5_0560.
- */
- i2c@3000 {
- #address-cells = <1>;
- #size-cells = <0>;
- cell-index = <0>;
- compatible = "fsl-i2c";
- reg = <0x3000 0x100>;
- interrupts = <43 2>;
- interrupt-parent = <&mpic>;
- dfsrr;
- };
-
-
-EXAMPLE 3
- /*
- * Definition of a node defining the 4
- * MPIC IPI interrupts. Note the interrupt
- * type of 2.
- */
- ipi@410a0 {
- compatible = "fsl,mpic-ipi";
- reg = <0x40040 0x10>;
- interrupts = <0 0 2 0
- 1 0 2 0
- 2 0 2 0
- 3 0 2 0>;
- };
-
-EXAMPLE 4
- /*
- * Definition of a node defining the MPIC
- * global timers. Note the interrupt
- * type of 3.
- */
- timer0: timer@41100 {
- compatible = "fsl,mpic-global-timer";
- reg = <0x41100 0x100 0x41300 4>;
- interrupts = <0 0 3 0
- 1 0 3 0
- 2 0 3 0
- 3 0 3 0>;
- };
-
-EXAMPLE 5
- /*
- * Definition of an error interrupt (interrupt type 1).
- * SoC interrupt number is 16 and the specific error
- * interrupt bit in the error interrupt summary register
- * is 23.
- */
- memory-controller@8000 {
- compatible = "fsl,p4080-memory-controller";
- reg = <0x8000 0x1000>;
- interrupts = <16 2 1 23>;
- };