1 # SPDX-License-Identifier: (GPL-2.0 OR MIT) 1 # SPDX-License-Identifier: (GPL-2.0 OR MIT)
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/riscv/cpus. 4 $id: http://devicetree.org/schemas/riscv/cpus.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: RISC-V CPUs !! 7 title: RISC-V bindings for 'cpus' DT nodes
8 8
9 maintainers: 9 maintainers:
10 - Paul Walmsley <paul.walmsley@sifive.com> 10 - Paul Walmsley <paul.walmsley@sifive.com>
11 - Palmer Dabbelt <palmer@sifive.com> 11 - Palmer Dabbelt <palmer@sifive.com>
12 - Conor Dooley <conor@kernel.org> <<
13 12
14 description: | 13 description: |
15 This document uses some terminology common t 14 This document uses some terminology common to the RISC-V community
16 that is not widely used, the definitions of 15 that is not widely used, the definitions of which are listed here:
17 16
18 hart: A hardware execution context, which co 17 hart: A hardware execution context, which contains all the state
19 mandated by the RISC-V ISA: a PC and some re 18 mandated by the RISC-V ISA: a PC and some registers. This
20 terminology is designed to disambiguate soft 19 terminology is designed to disambiguate software's view of execution
21 contexts from any particular microarchitectu 20 contexts from any particular microarchitectural implementation
22 strategy. For example, an Intel laptop cont 21 strategy. For example, an Intel laptop containing one socket with
23 two cores, each of which has two hyperthread 22 two cores, each of which has two hyperthreads, could be described as
24 having four harts. 23 having four harts.
25 24
26 allOf: <<
27 - $ref: /schemas/cpu.yaml# <<
28 - $ref: extensions.yaml <<
29 <<
30 properties: 25 properties:
31 compatible: 26 compatible:
32 oneOf: 27 oneOf:
33 - items: 28 - items:
34 - enum: 29 - enum:
35 - amd,mbv32 <<
36 - andestech,ax45mp <<
37 - canaan,k210 <<
38 - sifive,bullet0 <<
39 - sifive,e5 <<
40 - sifive,e7 <<
41 - sifive,e71 <<
42 - sifive,rocket0 30 - sifive,rocket0
43 - sifive,s7 !! 31 - sifive,e5
44 - sifive,u5 <<
45 - sifive,u54 <<
46 - sifive,u7 <<
47 - sifive,u74 <<
48 - sifive,u74-mc <<
49 - thead,c906 <<
50 - thead,c908 <<
51 - thead,c910 <<
52 - thead,c920 <<
53 - const: riscv <<
54 - items: <<
55 - enum: <<
56 - sifive,e51 32 - sifive,e51
57 - sifive,u54-mc 33 - sifive,u54-mc
58 - const: sifive,rocket0 !! 34 - sifive,u54
>> 35 - sifive,u5
59 - const: riscv 36 - const: riscv
60 - const: riscv # Simulator only 37 - const: riscv # Simulator only
61 description: 38 description:
62 Identifies that the hart uses the RISC-V 39 Identifies that the hart uses the RISC-V instruction set
63 and identifies the type of the hart. 40 and identifies the type of the hart.
64 41
65 mmu-type: 42 mmu-type:
66 description: 43 description:
67 Identifies the largest MMU address trans !! 44 Identifies the MMU address translation mode used on this
68 this hart. These values originate from !! 45 hart. These values originate from the RISC-V Privileged
69 Specification document, available from 46 Specification document, available from
70 https://riscv.org/specifications/ 47 https://riscv.org/specifications/
71 $ref: /schemas/types.yaml#/definitions/str !! 48 $ref: "/schemas/types.yaml#/definitions/string"
72 enum: 49 enum:
73 - riscv,sv32 50 - riscv,sv32
74 - riscv,sv39 51 - riscv,sv39
75 - riscv,sv48 52 - riscv,sv48
76 - riscv,sv57 <<
77 - riscv,none <<
78 <<
79 reg: <<
80 description: <<
81 The hart ID of this CPU node. <<
82 53
83 riscv,cbom-block-size: !! 54 riscv,isa:
84 $ref: /schemas/types.yaml#/definitions/uin <<
85 description: 55 description:
86 The blocksize in bytes for the Zicbom ca !! 56 Identifies the specific RISC-V instruction set architecture
87 !! 57 supported by the hart. These are documented in the RISC-V
88 riscv,cbop-block-size: !! 58 User-Level ISA document, available from
89 $ref: /schemas/types.yaml#/definitions/uin !! 59 https://riscv.org/specifications/
90 description: <<
91 The blocksize in bytes for the Zicbop ca <<
92 60
93 riscv,cboz-block-size: !! 61 While the isa strings in ISA specification are case
94 $ref: /schemas/types.yaml#/definitions/uin !! 62 insensitive, letters in the riscv,isa string must be all
95 description: !! 63 lowercase to simplify parsing.
96 The blocksize in bytes for the Zicboz ca !! 64 $ref: "/schemas/types.yaml#/definitions/string"
>> 65 enum:
>> 66 - rv64imac
>> 67 - rv64imafdc
97 68
98 # RISC-V has multiple properties for cache o <<
99 # differ between individual CBO extensions <<
100 cache-op-block-size: false <<
101 # RISC-V requires 'timebase-frequency' in /c 69 # RISC-V requires 'timebase-frequency' in /cpus, so disallow it here
102 timebase-frequency: false 70 timebase-frequency: false
103 71
104 interrupt-controller: 72 interrupt-controller:
105 type: object 73 type: object
106 $ref: /schemas/interrupt-controller/riscv, !! 74 description: Describes the CPU's local interrupt controller
107 75
108 cpu-idle-states: !! 76 properties:
109 $ref: /schemas/types.yaml#/definitions/pha !! 77 '#interrupt-cells':
110 items: !! 78 const: 1
111 maxItems: 1 <<
112 description: | <<
113 List of phandles to idle state nodes sup <<
114 by this hart (see ./idle-states.yaml). <<
115 79
116 capacity-dmips-mhz: !! 80 compatible:
117 description: !! 81 const: riscv,cpu-intc
118 u32 value representing CPU capacity (see !! 82
119 DMIPS/MHz, relative to highest capacity- !! 83 interrupt-controller: true
120 in the system. !! 84
121 !! 85 required:
122 anyOf: !! 86 - '#interrupt-cells'
123 - required: !! 87 - compatible
124 - riscv,isa !! 88 - interrupt-controller
125 - required: <<
126 - riscv,isa-base <<
127 <<
128 dependencies: <<
129 riscv,isa-base: [ "riscv,isa-extensions" ] <<
130 riscv,isa-extensions: [ "riscv,isa-base" ] <<
131 89
132 required: 90 required:
>> 91 - riscv,isa
133 - interrupt-controller 92 - interrupt-controller
134 93
135 unevaluatedProperties: false !! 94 additionalProperties: true
136 95
137 examples: 96 examples:
138 - | 97 - |
139 // Example 1: SiFive Freedom U540G Develop 98 // Example 1: SiFive Freedom U540G Development Kit
140 cpus { 99 cpus {
141 #address-cells = <1>; 100 #address-cells = <1>;
142 #size-cells = <0>; 101 #size-cells = <0>;
143 timebase-frequency = <1000000>; 102 timebase-frequency = <1000000>;
144 cpu@0 { 103 cpu@0 {
145 clock-frequency = <0>; 104 clock-frequency = <0>;
146 compatible = "sifive,rocket0", 105 compatible = "sifive,rocket0", "riscv";
147 device_type = "cpu"; 106 device_type = "cpu";
148 i-cache-block-size = <64>; 107 i-cache-block-size = <64>;
149 i-cache-sets = <128>; 108 i-cache-sets = <128>;
150 i-cache-size = <16384>; 109 i-cache-size = <16384>;
151 reg = <0>; 110 reg = <0>;
152 riscv,isa-base = "rv64i"; !! 111 riscv,isa = "rv64imac";
153 riscv,isa-extensions = "i", "m <<
154 <<
155 cpu_intc0: interrupt-controlle 112 cpu_intc0: interrupt-controller {
156 #interrupt-cells = <1> 113 #interrupt-cells = <1>;
157 compatible = "riscv,cp 114 compatible = "riscv,cpu-intc";
158 interrupt-controller; 115 interrupt-controller;
159 }; 116 };
160 }; 117 };
161 cpu@1 { 118 cpu@1 {
162 clock-frequency = <0>; 119 clock-frequency = <0>;
163 compatible = "sifive,rocket0", 120 compatible = "sifive,rocket0", "riscv";
164 d-cache-block-size = <64>; 121 d-cache-block-size = <64>;
165 d-cache-sets = <64>; 122 d-cache-sets = <64>;
166 d-cache-size = <32768>; 123 d-cache-size = <32768>;
167 d-tlb-sets = <1>; 124 d-tlb-sets = <1>;
168 d-tlb-size = <32>; 125 d-tlb-size = <32>;
169 device_type = "cpu"; 126 device_type = "cpu";
170 i-cache-block-size = <64>; 127 i-cache-block-size = <64>;
171 i-cache-sets = <64>; 128 i-cache-sets = <64>;
172 i-cache-size = <32768>; 129 i-cache-size = <32768>;
173 i-tlb-sets = <1>; 130 i-tlb-sets = <1>;
174 i-tlb-size = <32>; 131 i-tlb-size = <32>;
175 mmu-type = "riscv,sv39"; 132 mmu-type = "riscv,sv39";
176 reg = <1>; 133 reg = <1>;
>> 134 riscv,isa = "rv64imafdc";
177 tlb-split; 135 tlb-split;
178 riscv,isa-base = "rv64i"; <<
179 riscv,isa-extensions = "i", "m <<
180 <<
181 cpu_intc1: interrupt-controlle 136 cpu_intc1: interrupt-controller {
182 #interrupt-cells = <1> 137 #interrupt-cells = <1>;
183 compatible = "riscv,cp 138 compatible = "riscv,cpu-intc";
184 interrupt-controller; 139 interrupt-controller;
185 }; 140 };
186 }; 141 };
187 }; 142 };
188 143
189 - | 144 - |
190 // Example 2: Spike ISA Simulator with 1 H 145 // Example 2: Spike ISA Simulator with 1 Hart
191 cpus { 146 cpus {
192 #address-cells = <1>; 147 #address-cells = <1>;
193 #size-cells = <0>; 148 #size-cells = <0>;
194 cpu@0 { 149 cpu@0 {
195 device_type = "cpu"; 150 device_type = "cpu";
196 reg = <0>; 151 reg = <0>;
197 compatible = "riscv"; 152 compatible = "riscv";
>> 153 riscv,isa = "rv64imafdc";
198 mmu-type = "riscv,sv48"; 154 mmu-type = "riscv,sv48";
199 riscv,isa-base = "rv64i"; <<
200 riscv,isa-extensions = "i", "m <<
201 <<
202 interrupt-controller { 155 interrupt-controller {
203 #interrupt-cells = <1> 156 #interrupt-cells = <1>;
204 interrupt-controller; 157 interrupt-controller;
205 compatible = "riscv,cp 158 compatible = "riscv,cpu-intc";
206 }; 159 };
207 }; 160 };
208 }; 161 };
209 ... 162 ...
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