On Tue, Dec 23, 2025 at 5:42 PM Kane Chen <[email protected]> wrote: > > From: Kane-Chen-AS <[email protected]> > > Introduce a minimal QEMU device model for the ASPEED AST1700, an > MCU-less I/O expander used in the LTPI topology defined by the > DC-SCM 2.0 specification (see figure 2): > https://www.opencompute.org/documents/ocp-dc-scm-2-0-ltpi-ver-1-0-pdf > > This initial implementation includes: > > * Definition of aspeed.ast1700 as a SysBusDevice > > * Setup of a basic memory region to reserve I/O space for future > peripheral modeling > > This stub establishes the foundation for LTPI-related device emulation, > without implementing any functional peripherals at this stage. > > Signed-off-by: Kane-Chen-AS <[email protected]>
Reviewed-by: Nabih Estefan <[email protected]> Tested-by: Nabih Estefan <[email protected]> > --- > include/hw/arm/aspeed_ast1700.h | 23 ++++++++++++++++ > hw/arm/aspeed_ast1700.c | 47 +++++++++++++++++++++++++++++++++ > hw/arm/meson.build | 1 + > 3 files changed, 71 insertions(+) > create mode 100644 include/hw/arm/aspeed_ast1700.h > create mode 100644 hw/arm/aspeed_ast1700.c > > diff --git a/include/hw/arm/aspeed_ast1700.h b/include/hw/arm/aspeed_ast1700.h > new file mode 100644 > index 0000000000..2a95ebfe89 > --- /dev/null > +++ b/include/hw/arm/aspeed_ast1700.h > @@ -0,0 +1,23 @@ > +/* > + * ASPEED AST1700 IO Expander > + * > + * Copyright (C) 2025 ASPEED Technology Inc. > + * > + * SPDX-License-Identifier: GPL-2.0-or-later > + */ > +#ifndef ASPEED_AST1700_H > +#define ASPEED_AST1700_H > + > +#include "hw/sysbus.h" > + > +#define TYPE_ASPEED_AST1700 "aspeed.ast1700" > + > +OBJECT_DECLARE_SIMPLE_TYPE(AspeedAST1700SoCState, ASPEED_AST1700) > + > +struct AspeedAST1700SoCState { > + SysBusDevice parent_obj; > + > + MemoryRegion iomem; > +}; > + > +#endif /* ASPEED_AST1700_H */ > diff --git a/hw/arm/aspeed_ast1700.c b/hw/arm/aspeed_ast1700.c > new file mode 100644 > index 0000000000..bb6ca2ce9e > --- /dev/null > +++ b/hw/arm/aspeed_ast1700.c > @@ -0,0 +1,47 @@ > +/* > + * ASPEED AST1700 IO Expander > + * > + * Copyright (C) 2025 ASPEED Technology Inc. > + * > + * SPDX-License-Identifier: GPL-2.0-or-later > + */ > + > +#include "qemu/osdep.h" > +#include "hw/boards.h" > +#include "hw/qdev-core.h" > +#include "qom/object.h" > +#include "hw/arm/aspeed_ast1700.h" > + > +#define AST2700_SOC_LTPI_SIZE 0x01000000 > + > +static void aspeed_ast1700_realize(DeviceState *dev, Error **errp) > +{ > + AspeedAST1700SoCState *s = ASPEED_AST1700(dev); > + SysBusDevice *sbd = SYS_BUS_DEVICE(dev); > + > + /* Occupy memory space for all controllers in AST1700 */ > + memory_region_init(&s->iomem, OBJECT(s), TYPE_ASPEED_AST1700, > + AST2700_SOC_LTPI_SIZE); > + sysbus_init_mmio(sbd, &s->iomem); > +} > + > +static void aspeed_ast1700_class_init(ObjectClass *klass, const void *data) > +{ > + DeviceClass *dc = DEVICE_CLASS(klass); > + > + dc->realize = aspeed_ast1700_realize; > +} > + > +static const TypeInfo aspeed_ast1700_info = { > + .name = TYPE_ASPEED_AST1700, > + .parent = TYPE_SYS_BUS_DEVICE, > + .instance_size = sizeof(AspeedAST1700SoCState), > + .class_init = aspeed_ast1700_class_init, > +}; > + > +static void aspeed_ast1700_register_types(void) > +{ > + type_register_static(&aspeed_ast1700_info); > +} > + > +type_init(aspeed_ast1700_register_types); nit: missing trailing empty line. > diff --git a/hw/arm/meson.build b/hw/arm/meson.build > index aeaf654790..175942263d 100644 > --- a/hw/arm/meson.build > +++ b/hw/arm/meson.build > @@ -70,6 +70,7 @@ arm_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files( > 'aspeed_ast10x0_evb.c', > 'fby35.c')) > arm_common_ss.add(when: ['CONFIG_ASPEED_SOC', 'TARGET_AARCH64'], if_true: > files( > + 'aspeed_ast1700.c', > 'aspeed_ast27x0.c', > 'aspeed_ast27x0_evb.c', > 'aspeed_ast27x0-fc.c', > -- > 2.43.0 >
