=====================================================================
SEC 4 Device Tree Binding
Copyright (C) 2008-2011 Freescale Semiconductor Inc.

 CONTENTS
   -Overview
   -SEC 4 Node
   -Job Ring Node
   -Run Time Integrity Check (RTIC) Node
   -Run Time Integrity Check (RTIC) Memory Node
   -Secure Non-Volatile Storage (SNVS) Node
   -Secure Non-Volatile Storage (SNVS) Low Power (LP) RTC Node
   -Full Example

NOTE: the SEC 4 is also known as Freescale's Cryptographic Accelerator
Accelerator and Assurance Module (CAAM).

=====================================================================
Overview

DESCRIPTION

SEC 4 h/w can process requests from 2 types of sources.
1. DPAA Queue Interface (HW interface between Queue Manager & SEC 4).
2. Job Rings (HW interface between cores & SEC 4 registers).

High Speed Data Path Configuration:

HW interface between QM & SEC 4 and also BM & SEC 4, on DPAA-enabled parts
such as the P4080.  The number of simultaneous dequeues the QI can make is
equal to the number of Descriptor Controller (DECO) engines in a particular
SEC version.  E.g., the SEC 4.0 in the P4080 has 5 DECOs and can thus
dequeue from 5 subportals simultaneously.

Job Ring Data Path Configuration:

Each JR is located on a separate 4k page, they may (or may not) be made visible
in the memory partition devoted to a particular core.  The P4080 has 4 JRs, so
up to 4 JRs can be configured; and all 4 JRs process requests in parallel.

=====================================================================
SEC 4 Node

Description

    Node defines the base address of the SEC 4 block.
    This block specifies the address range of all global
    configuration registers for the SEC 4 block.  It
    also receives interrupts from the Run Time Integrity Check
    (RTIC) function within the SEC 4 block.

PROPERTIES

   - compatible
      Usage: required
      Value type: <string>
      Definition: Must include "fsl,sec-v4.0"

   - fsl,sec-era
      Usage: optional
      Value type: <u32>
      Definition: A standard property. Define the 'ERA' of the SEC
          device.

   - #address-cells
       Usage: required
       Value type: <u32>
       Definition: A standard property.  Defines the number of cells
           for representing physical addresses in child nodes.

   - #size-cells
       Usage: required
       Value type: <u32>
       Definition: A standard property.  Defines the number of cells
           for representing the size of physical addresses in
           child nodes.

   - reg
      Usage: required
      Value type: <prop-encoded-array>
      Definition: A standard property.  Specifies the physical
          address and length of the SEC4 configuration registers.
          registers

   - ranges
       Usage: required
       Value type: <prop-encoded-array>
       Definition: A standard property.  Specifies the physical address
           range of the SEC 4.0 register space (-SNVS not included).  A
           triplet that includes the child address, parent address, &
           length.

   - interrupts
      Usage: required
      Value type: <prop_encoded-array>
      Definition:  Specifies the interrupts generated by this
           device.  The value of the interrupts property
           consists of one interrupt specifier. The format
           of the specifier is defined by the binding document
           describing the node's interrupt parent.

   - interrupt-parent
      Usage: (required if interrupt property is defined)
      Value type: <phandle>
      Definition: A single <phandle> value that points
          to the interrupt parent to which the child domain
          is being mapped.

   - clocks
      Usage: required if SEC 4.0 requires explicit enablement of clocks
      Value type: <prop_encoded-array>
      Definition:  A list of phandle and clock specifier pairs describing
          the clocks required for enabling and disabling SEC 4.0.

   - clock-names
      Usage: required if SEC 4.0 requires explicit enablement of clocks
      Value type: <string>
      Definition: A list of clock name strings in the same order as the
          clocks property.

   Note: All other standard properties (see the Devicetree Specification)
   are allowed but are optional.


EXAMPLE

iMX6QDL/SX requires four clocks

	crypto@300000 {
		compatible = "fsl,sec-v4.0";
		fsl,sec-era = <2>;
		#address-cells = <1>;
		#size-cells = <1>;
		reg = <0x300000 0x10000>;
		ranges = <0 0x300000 0x10000>;
		interrupt-parent = <&mpic>;
		interrupts = <92 2>;
		clocks = <&clks IMX6QDL_CLK_CAAM_MEM>,
			 <&clks IMX6QDL_CLK_CAAM_ACLK>,
			 <&clks IMX6QDL_CLK_CAAM_IPG>,
			 <&clks IMX6QDL_CLK_EIM_SLOW>;
		clock-names = "mem", "aclk", "ipg", "emi_slow";
	};


iMX6UL does only require three clocks

	crypto: caam@2140000 {
		compatible = "fsl,sec-v4.0";
		#address-cells = <1>;
		#size-cells = <1>;
		reg = <0x2140000 0x3c000>;
		ranges = <0 0x2140000 0x3c000>;
		interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;

		clocks = <&clks IMX6UL_CLK_CAAM_MEM>,
			 <&clks IMX6UL_CLK_CAAM_ACLK>,
			 <&clks IMX6UL_CLK_CAAM_IPG>;
		clock-names = "mem", "aclk", "ipg";
	};

=====================================================================
Job Ring (JR) Node

    Child of the crypto node defines data processing interface to SEC 4
    across the peripheral bus for purposes of processing
    cryptographic descriptors. The specified address
    range can be made visible to one (or more) cores.
    The interrupt defined for this node is controlled within
    the address range of this node.

  - compatible
      Usage: required
      Value type: <string>
      Definition: Must include "fsl,sec-v4.0-job-ring"

  - reg
      Usage: required
      Value type: <prop-encoded-array>
      Definition: Specifies a two JR parameters:  an offset from
          the parent physical address and the length the JR registers.

   - fsl,liodn
       Usage: optional-but-recommended
       Value type: <prop-encoded-array>
       Definition:
           Specifies the LIODN to be used in conjunction with
           the ppid-to-liodn table that specifies the PPID to LIODN mapping.
           Needed if the PAMU is used.  Value is a 12 bit value
           where value is a LIODN ID for this JR. This property is
           normally set by boot firmware.

   - interrupts
      Usage: required
      Value type: <prop_encoded-array>
      Definition:  Specifies the interrupts generated by this
           device.  The value of the interrupts property
           consists of one interrupt specifier. The format
           of the specifier is defined by the binding document
           describing the node's interrupt parent.

   - interrupt-parent
      Usage: (required if interrupt property is defined)
      Value type: <phandle>
      Definition: A single <phandle> value that points
          to the interrupt parent to which the child domain
          is being mapped.

EXAMPLE
	jr@1000 {
		compatible = "fsl,sec-v4.0-job-ring";
		reg = <0x1000 0x1000>;
		fsl,liodn = <0x081>;
		interrupt-parent = <&mpic>;
		interrupts = <88 2>;
	};


=====================================================================
Run Time Integrity Check (RTIC) Node

  Child node of the crypto node.  Defines a register space that
  contains up to 5 sets of addresses and their lengths (sizes) that
  will be checked at run time.  After an initial hash result is
  calculated, these addresses are checked by HW to monitor any
  change.  If any memory is modified, a Security Violation is
  triggered (see SNVS definition).


  - compatible
      Usage: required
      Value type: <string>
      Definition: Must include "fsl,sec-v4.0-rtic".

   - #address-cells
       Usage: required
       Value type: <u32>
       Definition: A standard property.  Defines the number of cells
           for representing physical addresses in child nodes.  Must
           have a value of 1.

   - #size-cells
       Usage: required
       Value type: <u32>
       Definition: A standard property.  Defines the number of cells
           for representing the size of physical addresses in
           child nodes.  Must have a value of 1.

  - reg
      Usage: required
      Value type: <prop-encoded-array>
      Definition: A standard property.  Specifies a two parameters:
          an offset from the parent physical address and the length
          the SEC4 registers.

   - ranges
       Usage: required
       Value type: <prop-encoded-array>
       Definition: A standard property.  Specifies the physical address
           range of the SEC 4 register space (-SNVS not included).  A
           triplet that includes the child address, parent address, &
           length.

EXAMPLE
	rtic@6000 {
		compatible = "fsl,sec-v4.0-rtic";
		#address-cells = <1>;
		#size-cells = <1>;
		reg = <0x6000 0x100>;
		ranges = <0x0 0x6100 0xe00>;
	};

=====================================================================
Run Time Integrity Check (RTIC) Memory Node
  A child node that defines individual RTIC memory regions that are used to
  perform run-time integrity check of memory areas that should not modified.
  The node defines a register that contains the memory address &
  length (combined) and a second register that contains the hash result
  in big endian format.

  - compatible
      Usage: required
      Value type: <string>
      Definition: Must include "fsl,sec-v4.0-rtic-memory".

  - reg
      Usage: required
      Value type: <prop-encoded-array>
      Definition: A standard property.  Specifies two parameters:
          an offset from the parent physical address and the length:

          1. The location of the RTIC memory address & length registers.
          2. The location RTIC hash result.

  - fsl,rtic-region
       Usage: optional-but-recommended
       Value type: <prop-encoded-array>
       Definition:
           Specifies the HW address (36 bit address) for this region
           followed by the length of the HW partition to be checked;
           the address is represented as a 64 bit quantity followed
           by a 32 bit length.

   - fsl,liodn
       Usage: optional-but-recommended
       Value type: <prop-encoded-array>
       Definition:
           Specifies the LIODN to be used in conjunction with
           the ppid-to-liodn table that specifies the PPID to LIODN
           mapping.  Needed if the PAMU is used.  Value is a 12 bit value
           where value is a LIODN ID for this RTIC memory region. This
           property is normally set by boot firmware.

EXAMPLE
	rtic-a@0 {
		compatible = "fsl,sec-v4.0-rtic-memory";
		reg = <0x00 0x20 0x100 0x80>;
		fsl,liodn   = <0x03c>;
		fsl,rtic-region  = <0x12345678 0x12345678 0x12345678>;
	};

=====================================================================
Secure Non-Volatile Storage (SNVS) Node

    Node defines address range and the associated
    interrupt for the SNVS function.  This function
    monitors security state information & reports
    security violations. This also included rtc,
    system power off and ON/OFF key.

  - compatible
      Usage: required
      Value type: <string>
      Definition: Must include "fsl,sec-v4.0-mon" and "syscon".

  - reg
      Usage: required
      Value type: <prop-encoded-array>
      Definition: A standard property.  Specifies the physical
          address and length of the SEC4 configuration
          registers.

   - #address-cells
       Usage: required
       Value type: <u32>
       Definition: A standard property.  Defines the number of cells
           for representing physical addresses in child nodes.  Must
           have a value of 1.

   - #size-cells
       Usage: required
       Value type: <u32>
       Definition: A standard property.  Defines the number of cells
           for representing the size of physical addresses in
           child nodes.  Must have a value of 1.

   - ranges
       Usage: required
       Value type: <prop-encoded-array>
       Definition: A standard property.  Specifies the physical address
           range of the SNVS register space.  A triplet that includes
           the child address, parent address, & length.

   - interrupts
      Usage: optional
      Value type: <prop_encoded-array>
      Definition:  Specifies the interrupts generated by this
           device.  The value of the interrupts property
           consists of one interrupt specifier. The format
           of the specifier is defined by the binding document
           describing the node's interrupt parent.

   - interrupt-parent
      Usage: (required if interrupt property is defined)
      Value type: <phandle>
      Definition: A single <phandle> value that points
          to the interrupt parent to which the child domain
          is being mapped.

EXAMPLE
	sec_mon@314000 {
		compatible = "fsl,sec-v4.0-mon", "syscon";
		reg = <0x314000 0x1000>;
		ranges = <0 0x314000 0x1000>;
		interrupt-parent = <&mpic>;
		interrupts = <93 2>;
	};

=====================================================================
Secure Non-Volatile Storage (SNVS) Low Power (LP) RTC Node

  A SNVS child node that defines SNVS LP RTC.

  - compatible
      Usage: required
      Value type: <string>
      Definition: Must include "fsl,sec-v4.0-mon-rtc-lp".

  - interrupts
      Usage: required
      Value type: <prop_encoded-array>
      Definition: Specifies the interrupts generated by this
	   device.  The value of the interrupts property
	   consists of one interrupt specifier. The format
	   of the specifier is defined by the binding document
	   describing the node's interrupt parent.

 - regmap
	Usage: required
	Value type: <phandle>
	Definition: this is phandle to the register map node.

 - offset
	Usage: option
	value type: <u32>
	Definition: LP register offset. default it is 0x34.

EXAMPLE
	sec_mon_rtc_lp@1 {
		compatible = "fsl,sec-v4.0-mon-rtc-lp";
		interrupts = <93 2>;
		regmap = <&snvs>;
		offset = <0x34>;
	};

=====================================================================
System ON/OFF key driver

  The snvs-pwrkey is designed to enable POWER key function which controlled
  by SNVS ONOFF, the driver can report the status of POWER key and wakeup
  system if pressed after system suspend.

  - compatible:
      Usage: required
      Value type: <string>
      Definition: Mush include "fsl,sec-v4.0-pwrkey".

  - interrupts:
      Usage: required
      Value type: <prop_encoded-array>
      Definition: The SNVS ON/OFF interrupt number to the CPU(s).

  - linux,keycode:
      Usage: option
      Value type: <int>
      Definition: Keycode to emit, KEY_POWER by default.

  - wakeup-source:
      Usage: option
      Value type: <boo>
      Definition: Button can wake-up the system.

 - regmap:
      Usage: required:
      Value type: <phandle>
      Definition: this is phandle to the register map node.

EXAMPLE:
	snvs-pwrkey@0x020cc000 {
		compatible = "fsl,sec-v4.0-pwrkey";
		regmap = <&snvs>;
		interrupts = <0 4 0x4>
	        linux,keycode = <116>; /* KEY_POWER */
		wakeup-source;
	};

=====================================================================
FULL EXAMPLE

	crypto: crypto@300000 {
		compatible = "fsl,sec-v4.0";
		#address-cells = <1>;
		#size-cells = <1>;
		reg = <0x300000 0x10000>;
		ranges = <0 0x300000 0x10000>;
		interrupt-parent = <&mpic>;
		interrupts = <92 2>;

		sec_jr0: jr@1000 {
			compatible = "fsl,sec-v4.0-job-ring";
			reg = <0x1000 0x1000>;
			interrupt-parent = <&mpic>;
			interrupts = <88 2>;
		};

		sec_jr1: jr@2000 {
			compatible = "fsl,sec-v4.0-job-ring";
			reg = <0x2000 0x1000>;
			interrupt-parent = <&mpic>;
			interrupts = <89 2>;
		};

		sec_jr2: jr@3000 {
			compatible = "fsl,sec-v4.0-job-ring";
			reg = <0x3000 0x1000>;
			interrupt-parent = <&mpic>;
			interrupts = <90 2>;
		};

		sec_jr3: jr@4000 {
			compatible = "fsl,sec-v4.0-job-ring";
			reg = <0x4000 0x1000>;
			interrupt-parent = <&mpic>;
			interrupts = <91 2>;
		};

		rtic@6000 {
			compatible = "fsl,sec-v4.0-rtic";
			#address-cells = <1>;
			#size-cells = <1>;
			reg = <0x6000 0x100>;
			ranges = <0x0 0x6100 0xe00>;

			rtic_a: rtic-a@0 {
				compatible = "fsl,sec-v4.0-rtic-memory";
				reg = <0x00 0x20 0x100 0x80>;
			};

			rtic_b: rtic-b@20 {
				compatible = "fsl,sec-v4.0-rtic-memory";
				reg = <0x20 0x20 0x200 0x80>;
			};

			rtic_c: rtic-c@40 {
				compatible = "fsl,sec-v4.0-rtic-memory";
				reg = <0x40 0x20 0x300 0x80>;
			};

			rtic_d: rtic-d@60 {
				compatible = "fsl,sec-v4.0-rtic-memory";
				reg = <0x60 0x20 0x500 0x80>;
			};
		};
	};

	sec_mon: sec_mon@314000 {
		compatible = "fsl,sec-v4.0-mon";
		reg = <0x314000 0x1000>;
		ranges = <0 0x314000 0x1000>;

		sec_mon_rtc_lp@34 {
			compatible = "fsl,sec-v4.0-mon-rtc-lp";
			regmap = <&sec_mon>;
			offset = <0x34>;
			interrupts = <93 2>;
		};

		snvs-pwrkey@0x020cc000 {
			compatible = "fsl,sec-v4.0-pwrkey";
			regmap = <&sec_mon>;
			interrupts = <0 4 0x4>;
			linux,keycode = <116>; /* KEY_POWER */
			wakeup-source;
		};
	};

=====================================================================