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2 ARM CCI cache coherent interconnect binding description
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5 ARM multi-cluster systems maintain intra-cluster coherency through a
6 cache coherent interconnect (CCI) that is capable of monitoring bus
7 transactions and manage coherency, TLB invalidations and memory barriers.
9 It allows snooping and distributed virtual memory message broadcast across
10 clusters, through memory mapped interface, with a global control register
11 space and multiple sets of interface control registers, one per slave
14 Bindings for the CCI node follow the ePAPR standard, available from:
16 www.power.org/documentation/epapr-version-1-1/
18 with the addition of the bindings described in this document which are
21 * CCI interconnect node
23 Description: Describes a CCI cache coherent Interconnect component
25 Node name must be "cci".
26 Node's parent must be the root node /, and the address space visible
27 through the CCI interconnect is the same as the one seen from the
28 root node (ie from CPUs perspective as per DT standard).
29 Every CCI node has to define the following properties:
34 Definition: must be set to
39 Value type: Integer cells. A register entry, expressed as a pair
40 of cells, containing base and size.
41 Definition: A standard property. Specifies base physical
42 address of CCI control registers common to all
47 Value type: Integer cells. An array of range entries, expressed
48 as a tuple of cells, containing child address,
49 parent address and the size of the region in the
51 Definition: A standard property. Follow rules in the ePAPR for
52 hierarchical bus addressing. CCI interfaces
53 addresses refer to the parent node addressing
54 scheme to declare their register bases.
56 CCI interconnect node can define the following child nodes:
58 - CCI control interface nodes
60 Node name must be "slave-if".
61 Parent node must be CCI interconnect node.
63 A CCI control interface node must contain the following
69 Definition: must be set to
75 Definition: must be set to one of {"ace", "ace-lite"}
76 depending on the interface type the node
81 Value type: Integer cells. A register entry, expressed
82 as a pair of cells, containing base and
84 Definition: the base address and size of the
85 corresponding interface programming
88 * CCI interconnect bus masters
90 Description: masters in the device tree connected to a CCI port
91 (inclusive of CPUs and their cpu nodes).
93 A CCI interconnect bus master node must contain the following
99 Definition: a phandle containing the CCI control interface node
100 the master is connected to.
106 #address-cells = <1>;
110 compatible = "arm,cortex-a15";
111 cci-control-port = <&cci_control1>;
117 compatible = "arm,cortex-a15";
118 cci-control-port = <&cci_control1>;
124 compatible = "arm,cortex-a7";
125 cci-control-port = <&cci_control2>;
131 compatible = "arm,cortex-a7";
132 cci-control-port = <&cci_control2>;
139 compatible = "arm,pl330", "arm,primecell";
140 cci-control-port = <&cci_control0>;
141 reg = <0x0 0x3000000 0x0 0x1000>;
145 #dma-requests = <32>;
149 compatible = "arm,cci-400";
150 #address-cells = <1>;
152 reg = <0x0 0x2c090000 0 0x1000>;
153 ranges = <0x0 0x0 0x2c090000 0x6000>;
155 cci_control0: slave-if@1000 {
156 compatible = "arm,cci-400-ctrl-if";
157 interface-type = "ace-lite";
158 reg = <0x1000 0x1000>;
161 cci_control1: slave-if@4000 {
162 compatible = "arm,cci-400-ctrl-if";
163 interface-type = "ace";
164 reg = <0x4000 0x1000>;
167 cci_control2: slave-if@5000 {
168 compatible = "arm,cci-400-ctrl-if";
169 interface-type = "ace";
170 reg = <0x5000 0x1000>;
174 This CCI node corresponds to a CCI component whose control registers sits
175 at address 0x000000002c090000.
176 CCI slave interface @0x000000002c091000 is connected to dma controller dma0.
177 CCI slave interface @0x000000002c094000 is connected to CPUs {CPU0, CPU1};
178 CCI slave interface @0x000000002c095000 is connected to CPUs {CPU2, CPU3};