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]> --- include/hw/arm/aspeed_ast1700.h | 23 ++++++++++++++++ hw/arm/aspeed_ast1700.c | 48 +++++++++++++++++++++++++++++++++ hw/arm/meson.build | 1 + 3 files changed, 72 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..f564b9b242 --- /dev/null +++ b/hw/arm/aspeed_ast1700.c @@ -0,0 +1,48 @@ +/* + * 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, + .abstract = false, +}; + +static void aspeed_ast1700_register_types(void) +{ + type_register_static(&aspeed_ast1700_info); +} + +type_init(aspeed_ast1700_register_types); diff --git a/hw/arm/meson.build b/hw/arm/meson.build index aeaf654790..ee26a05dc9 100644 --- a/hw/arm/meson.build +++ b/hw/arm/meson.build @@ -42,6 +42,7 @@ arm_common_ss.add(when: 'CONFIG_FSL_IMX31', if_true: files('fsl-imx31.c', 'kzm.c arm_common_ss.add(when: 'CONFIG_FSL_IMX6', if_true: files('fsl-imx6.c')) arm_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files( 'aspeed.c', + 'aspeed_ast1700.c', 'aspeed_soc_common.c', 'aspeed_ast2400.c', 'aspeed_ast2400_palmetto.c', -- 2.43.0
