i3c: Start basic driver

This does the initialization sequence, routes interrupts, and does
passes reads and writes to the clients.

I haven't had a chance to do much testing yet, but that will be easier
once the peripheral is more complete.

Cargo.toml

@@ -3,23 +3,24 @@
 [workspace]
 members = [
     "emulator/app",
+    "emulator/bmc/pldm-fw-pkg",
+    "emulator/bus",
     "emulator/caliptra",
     "emulator/compliance-test",
-    "emulator/bus",
     "emulator/cpu",
     "emulator/derive",
     "emulator/periph",
     "emulator/types",
+    "registers/generated-emulator",
+    "registers/generated-firmware",
+    "registers/generator",
+    "registers/systemrdl",
     "rom",
     "runtime",
     "runtime/apps/pldm",
+    "runtime/i3c",
     "tests/hello",
     "xtask",
-    "registers/generated-emulator",
-    "registers/generated-firmware",
-    "registers/generator",
-    "registers/systemrdl",
-    "emulator/bmc/pldm-fw-pkg",
 ]
 resolver = "2"
 
@@ -61,6 +62,7 @@ gdbstub = "0.6.3"
 gdbstub_arch = "0.2.4"
 getrandom = "0.2"
 hex = "0.4.3"
+i3c-driver = { path = "runtime/i3c" }
 lazy_static = "1.4.0"
 num-derive = "0.4.2"
 num_enum = "0.7.2"

emulator/periph/src/i3c.rs

@@ -11,7 +11,7 @@ use emulator_bus::{Clock, Timer};
 use emulator_cpu::Irq;
 use emulator_registers_generated::i3c::I3cPeripheral;
 use emulator_types::{RvData, RvSize};
-use registers_generated::i3c::bits::{ExtcapHeader, TtiQueueSize};
+use registers_generated::i3c::bits::{ExtcapHeader, StbyCrCapabilities, TtiQueueSize};
 use std::collections::VecDeque;
 use zerocopy::FromBytes;
 
@@ -97,6 +97,13 @@ impl I3cPeripheral for I3c {
         RvData::from(Self::HCI_VERSION)
     }
 
+    fn read_i3c_ec_stdby_ctrl_mode_stby_cr_capabilities(
+        &mut self,
+        _size: emulator_types::RvSize,
+    ) -> emulator_bus::ReadWriteRegister<u32, StbyCrCapabilities::Register> {
+        emulator_bus::ReadWriteRegister::new(StbyCrCapabilities::TargetXactSupport.val(1).value)
+    }
+
     fn read_i3c_ec_tti_extcap_header(
         &mut self,
         _size: RvSize,

runtime/Cargo.toml

@@ -13,7 +13,10 @@ capsules-core = { git = "https://github.com/tock/tock.git", rev = "b128ae817b867
 capsules-extra = { git = "https://github.com/tock/tock.git", rev = "b128ae817b86706c8c4e39d27fae5c54b98659f1" }
 capsules-system = { git = "https://github.com/tock/tock.git", rev = "b128ae817b86706c8c4e39d27fae5c54b98659f1" }
 components = { git = "https://github.com/tock/tock.git", rev = "b128ae817b86706c8c4e39d27fae5c54b98659f1" }
+i3c-driver.workspace = true
 kernel = { git = "https://github.com/tock/tock.git", rev = "b128ae817b86706c8c4e39d27fae5c54b98659f1" }
+registers-generated.workspace = true
 riscv = { git = "https://github.com/tock/tock.git", rev = "b128ae817b86706c8c4e39d27fae5c54b98659f1" }
 riscv-csr = { git = "https://github.com/tock/tock.git", rev = "b128ae817b86706c8c4e39d27fae5c54b98659f1" }
 rv32i = { git = "https://github.com/tock/tock.git", rev = "b128ae817b86706c8c4e39d27fae5c54b98659f1" }
+tock-registers.workspace = true

runtime/i3c/Cargo.toml

@@ -0,0 +1,15 @@
+# Licensed under the Apache-2.0 license
+
+[package]
+name = "i3c-driver"
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+
+[dependencies]
+kernel = { git = "https://github.com/tock/tock.git", rev = "b128ae817b86706c8c4e39d27fae5c54b98659f1" }
+
+[target.'cfg(target_arch = "riscv32")'.dependencies]
+capsules-core = { git = "https://github.com/tock/tock.git", rev = "b128ae817b86706c8c4e39d27fae5c54b98659f1" }
+registers-generated.workspace = true
+tock-registers.workspace = true