qemu

FORK: QEMU emulator
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sbsa_ec.c (2628B)

      1 /*
      2  * ARM SBSA Reference Platform Embedded Controller
      3  *
      4  * A device to allow PSCI running in the secure side of sbsa-ref machine
      5  * to communicate platform power states to qemu.
      6  *
      7  * Copyright (c) 2020 Nuvia Inc
      8  * Written by Graeme Gregory <graeme@nuviainc.com>
      9  *
     10  * SPDX-License-Identifier: GPL-2.0-or-later
     11  */
     12 
     13 #include "qemu/osdep.h"
     14 #include "qemu/log.h"
     15 #include "hw/sysbus.h"
     16 #include "sysemu/runstate.h"
     17 
     18 typedef struct {
     19     SysBusDevice parent_obj;
     20     MemoryRegion iomem;
     21 } SECUREECState;
     22 
     23 #define TYPE_SBSA_EC      "sbsa-ec"
     24 #define SECURE_EC(obj) OBJECT_CHECK(SECUREECState, (obj), TYPE_SBSA_EC)
     25 
     26 enum sbsa_ec_powerstates {
     27     SBSA_EC_CMD_POWEROFF = 0x01,
     28     SBSA_EC_CMD_REBOOT = 0x02,
     29 };
     30 
     31 static uint64_t sbsa_ec_read(void *opaque, hwaddr offset, unsigned size)
     32 {
     33     /* No use for this currently */
     34     qemu_log_mask(LOG_GUEST_ERROR, "sbsa-ec: no readable registers");
     35     return 0;
     36 }
     37 
     38 static void sbsa_ec_write(void *opaque, hwaddr offset,
     39                      uint64_t value, unsigned size)
     40 {
     41     if (offset == 0) { /* PSCI machine power command register */
     42         switch (value) {
     43         case SBSA_EC_CMD_POWEROFF:
     44             qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
     45             break;
     46         case SBSA_EC_CMD_REBOOT:
     47             qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
     48             break;
     49         default:
     50             qemu_log_mask(LOG_GUEST_ERROR,
     51                           "sbsa-ec: unknown power command");
     52         }
     53     } else {
     54         qemu_log_mask(LOG_GUEST_ERROR, "sbsa-ec: unknown EC register");
     55     }
     56 }
     57 
     58 static const MemoryRegionOps sbsa_ec_ops = {
     59     .read = sbsa_ec_read,
     60     .write = sbsa_ec_write,
     61     .endianness = DEVICE_NATIVE_ENDIAN,
     62     .valid.min_access_size = 4,
     63     .valid.max_access_size = 4,
     64 };
     65 
     66 static void sbsa_ec_init(Object *obj)
     67 {
     68     SECUREECState *s = SECURE_EC(obj);
     69     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
     70 
     71     memory_region_init_io(&s->iomem, obj, &sbsa_ec_ops, s, "sbsa-ec",
     72                           0x1000);
     73     sysbus_init_mmio(dev, &s->iomem);
     74 }
     75 
     76 static void sbsa_ec_class_init(ObjectClass *klass, void *data)
     77 {
     78     DeviceClass *dc = DEVICE_CLASS(klass);
     79 
     80     /* No vmstate or reset required: device has no internal state */
     81     dc->user_creatable = false;
     82 }
     83 
     84 static const TypeInfo sbsa_ec_info = {
     85     .name          = TYPE_SBSA_EC,
     86     .parent        = TYPE_SYS_BUS_DEVICE,
     87     .instance_size = sizeof(SECUREECState),
     88     .instance_init = sbsa_ec_init,
     89     .class_init    = sbsa_ec_class_init,
     90 };
     91 
     92 static void sbsa_ec_register_type(void)
     93 {
     94     type_register_static(&sbsa_ec_info);
     95 }
     96 
     97 type_init(sbsa_ec_register_type);