Add a SysBus model for the 64 K230 Function IO configuration registers documented by the K230 Technical Reference Manual. The model retains the writable configuration fields needed by the SDK U-Boot and Linux read-modify-write paths.
The series adds the device model, wires it into the K230 SoC at 0x91105000, and adds qtest coverage. Changes in v3: - Migrated the model from the deprecated device_class_set_legacy_reset() to the Resettable interface. - Added a comment to the model stating that bit 31 (DI) is read-only and reads as zero, since the model does not simulate external pin input (TRM V0.3.1, section 12.9.2.2). - Added MAINTAINERS entries for the model and the qtest. - Defined an independent K230_IOMUX_EXPECTED_WRITABLE_MASK (0x00003fff) in the test instead of reusing the implementation mask, with a comment explaining the bit layout. Changes in v2: - Split the device model, SoC wiring, and qtest coverage into separate patches. - Removed redundant MMIO bounds, access-size, and alignment checks. - Limited register storage to the 64 documented Function IO registers. - Applied the documented 0x00003fff writable mask. - Treated offsets 0x100 through 0x7ff as reserved. - Added tests for write masking, read-modify-write accesses, IO63, reserved offsets, and system reset. Tested with: - qtest-riscv64/k230-iomux-test - U-Boot and Linux boot tests with no unimplemented-device warnings for the IOMUX region Thanks to Alistair Francis and Chao Liu for the v1 review comments that shaped the v2 series structure and the register semantics. Reviewed-by: Junze Cao <[email protected]> v2: https://lore.kernel.org/qemu-devel/[email protected]/ v1: https://lore.kernel.org/qemu-devel/[email protected]/ Kangjie Huang (3): hw/misc/k230_iomux: add Kendryte K230 IOMUX model hw/riscv/k230: wire up the IOMUX device tests/qtest: add test for K230 IOMUX MAINTAINERS | 3 + docs/system/riscv/k230.rst | 1 + hw/misc/Kconfig | 3 + hw/misc/k230_iomux.c | 125 ++++++++++++++++++++++++++ hw/misc/meson.build | 1 + hw/misc/trace-events | 4 + hw/riscv/Kconfig | 1 + hw/riscv/k230.c | 11 ++- include/hw/misc/k230_iomux.h | 43 +++++++++ include/hw/riscv/k230.h | 2 + tests/qtest/k230-iomux-test.c | 160 ++++++++++++++++++++++++++++++++++ tests/qtest/meson.build | 5 +- 12 files changed, 355 insertions(+), 4 deletions(-) create mode 100644 hw/misc/k230_iomux.c create mode 100644 include/hw/misc/k230_iomux.h create mode 100644 tests/qtest/k230-iomux-test.c base-commit: d49f87606ac1a6e15701b26c1b16c5d7e948ffcb -- 2.43.0
