| /* |
| * IMX7 Secure Non-Volatile Storage |
| * |
| * Copyright (c) 2018, Impinj, Inc. |
| * |
| * Author: Andrey Smirnov <andrew.smirnov@gmail.com> |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| * |
| * Bare minimum emulation code needed to support being able to shut |
| * down linux guest gracefully. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "hw/misc/imx7_snvs.h" |
| #include "qemu/log.h" |
| #include "sysemu/sysemu.h" |
| |
| static uint64_t imx7_snvs_read(void *opaque, hwaddr offset, unsigned size) |
| { |
| return 0; |
| } |
| |
| static void imx7_snvs_write(void *opaque, hwaddr offset, |
| uint64_t v, unsigned size) |
| { |
| const uint32_t value = v; |
| const uint32_t mask = SNVS_LPCR_TOP | SNVS_LPCR_DP_EN; |
| |
| if (offset == SNVS_LPCR && ((value & mask) == mask)) { |
| qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); |
| } |
| } |
| |
| static const struct MemoryRegionOps imx7_snvs_ops = { |
| .read = imx7_snvs_read, |
| .write = imx7_snvs_write, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| .impl = { |
| /* |
| * Our device would not work correctly if the guest was doing |
| * unaligned access. This might not be a limitation on the real |
| * device but in practice there is no reason for a guest to access |
| * this device unaligned. |
| */ |
| .min_access_size = 4, |
| .max_access_size = 4, |
| .unaligned = false, |
| }, |
| }; |
| |
| static void imx7_snvs_init(Object *obj) |
| { |
| SysBusDevice *sd = SYS_BUS_DEVICE(obj); |
| IMX7SNVSState *s = IMX7_SNVS(obj); |
| |
| memory_region_init_io(&s->mmio, obj, &imx7_snvs_ops, s, |
| TYPE_IMX7_SNVS, 0x1000); |
| |
| sysbus_init_mmio(sd, &s->mmio); |
| } |
| |
| static void imx7_snvs_class_init(ObjectClass *klass, void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| dc->desc = "i.MX7 Secure Non-Volatile Storage Module"; |
| } |
| |
| static const TypeInfo imx7_snvs_info = { |
| .name = TYPE_IMX7_SNVS, |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(IMX7SNVSState), |
| .instance_init = imx7_snvs_init, |
| .class_init = imx7_snvs_class_init, |
| }; |
| |
| static void imx7_snvs_register_type(void) |
| { |
| type_register_static(&imx7_snvs_info); |
| } |
| type_init(imx7_snvs_register_type) |