Bindings/net/qcom,ipa.yaml

   1 # SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/net/qcom,ipa.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Qualcomm IP Accelerator (IPA)
   8
   9 maintainers:
  10   - Alex Elder <elder@kernel.org>
  11
  12 description:
  13   This binding describes the Qualcomm IPA.  The IPA is capable of offloading
  14   certain network processing tasks (e.g. filtering, routing, and NAT) from
  15   the main processor.
  16
  17   The IPA sits between multiple independent "execution environments,"
  18   including the Application Processor (AP) and the modem.  The IPA presents
  19   a Generic Software Interface (GSI) to each execution environment.
  20   The GSI is an integral part of the IPA, but it is logically isolated
  21   and has a distinct interrupt and a separately-defined address space.
  22
  23   See also soc/qcom/qcom,smp2p.txt and interconnect/interconnect.txt.  See
  24   iommu/iommu.txt and iommu/arm,smmu.yaml for more information about SMMU
  25   bindings.
  26
  27
  28   - |
  29     --------             ---------
  30     |      |             |       |
  31     |  AP  +<---.   .----+ Modem |
  32     |      +--. |   | .->+       |
  33     |      |  | |   | |  |       |
  34     --------  | |   | |  ---------
  35               v |   v |
  36             --+-+---+-+--
  37             |    GSI    |
  38             |-----------|
  39             |           |
  40             |    IPA    |
  41             |           |
  42             -------------
  43
  44 properties:
  45   compatible:
  46       const: "qcom,sdm845-ipa"
  47
  48   reg:
  49     items:
  50       - description: IPA registers
  51       - description: IPA shared memory
  52       - description: GSI registers
  53
  54   reg-names:
  55     items:
  56       - const: ipa-reg
  57       - const: ipa-shared
  58       - const: gsi
  59
  60   iommus:
  61     maxItems: 1
  62
  63   clocks:
  64     maxItems: 1
  65
  66   clock-names:
  67       const: core
  68
  69   interrupts:
  70     items:
  71       - description: IPA interrupt (hardware IRQ)
  72       - description: GSI interrupt (hardware IRQ)
  73       - description: Modem clock query interrupt (smp2p interrupt)
  74       - description: Modem setup ready interrupt (smp2p interrupt)
  75
  76   interrupt-names:
  77     items:
  78       - const: ipa
  79       - const: gsi
  80       - const: ipa-clock-query
  81       - const: ipa-setup-ready
  82
  83   interconnects:
  84     items:
  85       - description: Interconnect path between IPA and main memory
  86       - description: Interconnect path between IPA and internal memory
  87       - description: Interconnect path between IPA and the AP subsystem
  88
  89   interconnect-names:
  90     items:
  91       - const: memory
  92       - const: imem
  93       - const: config
  94
  95   qcom,smem-states:
  96     $ref: /schemas/types.yaml#/definitions/phandle-array
  97     description: State bits used in by the AP to signal the modem.
  98     items:
  99     - description: Whether the "ipa-clock-enabled" state bit is valid
 100     - description: Whether the IPA clock is enabled (if valid)
 101
 102   qcom,smem-state-names:
 103     $ref: /schemas/types.yaml#/definitions/string-array
 104     description: The names of the state bits used for SMP2P output
 105     items:
 106       - const: ipa-clock-enabled-valid
 107       - const: ipa-clock-enabled
 108
 109   modem-init:
 110     type: boolean
 111     description:
 112       If present, it indicates that the modem is responsible for
 113       performing early IPA initialization, including loading and
 114       validating firwmare used by the GSI.
 115
 116   modem-remoteproc:
 117     $ref: /schemas/types.yaml#definitions/phandle
 118     description:
 119       This defines the phandle to the remoteproc node representing
 120       the modem subsystem.  This is requied so the IPA driver can
 121       receive and act on notifications of modem up/down events.
 122
 123   memory-region:
 124     $ref: /schemas/types.yaml#/definitions/phandle-array
 125     maxItems: 1
 126     description:
 127       If present, a phandle for a reserved memory area that holds
 128       the firmware passed to Trust Zone for authentication.  Required
 129       when Trust Zone (not the modem) performs early initialization.
 130
 131 required:
 132   - compatible
 133   - iommus
 134   - reg
 135   - clocks
 136   - interrupts
 137   - interconnects
 138   - qcom,smem-states
 139   - modem-remoteproc
 140
 141 oneOf:
 142   - required:
 143     - modem-init
 144   - required:
 145     - memory-region
 146
 147 examples:
 148   - |
 149         #include <dt-bindings/interrupt-controller/irq.h>
 150         #include <dt-bindings/clock/qcom,rpmh.h>
 151         #include <dt-bindings/interconnect/qcom,sdm845.h>
 152
 153         smp2p-mpss {
 154                 compatible = "qcom,smp2p";
 155                 ipa_smp2p_out: ipa-ap-to-modem {
 156                         qcom,entry-name = "ipa";
 157                         #qcom,smem-state-cells = <1>;
 158                 };
 159
 160                 ipa_smp2p_in: ipa-modem-to-ap {
 161                         qcom,entry-name = "ipa";
 162                         interrupt-controller;
 163                         #interrupt-cells = <2>;
 164                 };
 165         };
 166         ipa@1e40000 {
 167                 compatible = "qcom,sdm845-ipa";
 168
 169                 modem-init;
 170                 modem-remoteproc = <&mss_pil>;
 171
 172                 iommus = <&apps_smmu 0x720 0x3>;
 173                 reg = <0x1e40000 0x7000>,
 174                         <0x1e47000 0x2000>,
 175                         <0x1e04000 0x2c000>;
 176                 reg-names = "ipa-reg",
 177                             "ipa-shared",
 178                             "gsi";
 179
 180                 interrupts-extended = <&intc 0 311 IRQ_TYPE_EDGE_RISING>,
 181                                       <&intc 0 432 IRQ_TYPE_LEVEL_HIGH>,
 182                                       <&ipa_smp2p_in 0 IRQ_TYPE_EDGE_RISING>,
 183                                       <&ipa_smp2p_in 1 IRQ_TYPE_EDGE_RISING>;
 184                 interrupt-names = "ipa",
 185                                   "gsi",
 186                                   "ipa-clock-query",
 187                                   "ipa-setup-ready";
 188
 189                 clocks = <&rpmhcc RPMH_IPA_CLK>;
 190                 clock-names = "core";
 191
 192                 interconnects =
 193                         <&rsc_hlos MASTER_IPA &rsc_hlos SLAVE_EBI1>,
 194                         <&rsc_hlos MASTER_IPA &rsc_hlos SLAVE_IMEM>,
 195                         <&rsc_hlos MASTER_APPSS_PROC &rsc_hlos SLAVE_IPA_CFG>;
 196                 interconnect-names = "memory",
 197                                      "imem",
 198                                      "config";
 199
 200                 qcom,smem-states = <&ipa_smp2p_out 0>,
 201                                    <&ipa_smp2p_out 1>;
 202                 qcom,smem-state-names = "ipa-clock-enabled-valid",
 203                                         "ipa-clock-enabled";
 204         };