hw/fsi/fsi.c

   1 /*
   2  * SPDX-License-Identifier: GPL-2.0-or-later
   3  * Copyright (C) 2024 IBM Corp.
   4  *
   5  * IBM Flexible Service Interface
   6  */
   7 #include "qemu/osdep.h"
   8 #include "qapi/error.h"
   9 #include "qemu/log.h"
  10 #include "trace.h"
  11
  12 #include "hw/fsi/fsi.h"
  13
  14 #define TO_REG(x)                               ((x) >> 2)
  15
  16 static const TypeInfo fsi_bus_info = {
  17     .name = TYPE_FSI_BUS,
  18     .parent = TYPE_BUS,
  19     .instance_size = sizeof(FSIBus),
  20 };
  21
  22 static uint64_t fsi_slave_read(void *opaque, hwaddr addr, unsigned size)
  23 {
  24     FSISlaveState *s = FSI_SLAVE(opaque);
  25     int reg = TO_REG(addr);
  26
  27     trace_fsi_slave_read(addr, size);
  28
  29     if (reg >= FSI_SLAVE_CONTROL_NR_REGS) {
  30         qemu_log_mask(LOG_GUEST_ERROR,
  31                       "%s: Out of bounds read: 0x%"HWADDR_PRIx" for %u\n",
  32                       __func__, addr, size);
  33         return 0;
  34     }
  35
  36     return s->regs[reg];
  37 }
  38
  39 static void fsi_slave_write(void *opaque, hwaddr addr, uint64_t data,
  40                                  unsigned size)
  41 {
  42     FSISlaveState *s = FSI_SLAVE(opaque);
  43     int reg = TO_REG(addr);
  44
  45     trace_fsi_slave_write(addr, size, data);
  46
  47     if (reg >= FSI_SLAVE_CONTROL_NR_REGS) {
  48         qemu_log_mask(LOG_GUEST_ERROR,
  49                       "%s: Out of bounds write: 0x%"HWADDR_PRIx" for %u\n",
  50                       __func__, addr, size);
  51         return;
  52     }
  53
  54     s->regs[reg] = data;
  55 }
  56
  57 static const struct MemoryRegionOps fsi_slave_ops = {
  58     .read = fsi_slave_read,
  59     .write = fsi_slave_write,
  60     .endianness = DEVICE_BIG_ENDIAN,
  61 };
  62
  63 static void fsi_slave_reset(DeviceState *dev)
  64 {
  65     FSISlaveState *s = FSI_SLAVE(dev);
  66
  67     /* Initialize registers */
  68     memset(s->regs, 0, sizeof(s->regs));
  69 }
  70
  71 static void fsi_slave_init(Object *o)
  72 {
  73     FSISlaveState *s = FSI_SLAVE(o);
  74
  75     memory_region_init_io(&s->iomem, OBJECT(s), &fsi_slave_ops,
  76                           s, TYPE_FSI_SLAVE, 0x400);
  77 }
  78
  79 static void fsi_slave_class_init(ObjectClass *klass, void *data)
  80 {
  81     DeviceClass *dc = DEVICE_CLASS(klass);
  82
  83     dc->bus_type = TYPE_FSI_BUS;
  84     dc->desc = "FSI Slave";
  85     device_class_set_legacy_reset(dc, fsi_slave_reset);
  86 }
  87
  88 static const TypeInfo fsi_slave_info = {
  89     .name = TYPE_FSI_SLAVE,
  90     .parent = TYPE_DEVICE,
  91     .instance_init = fsi_slave_init,
  92     .instance_size = sizeof(FSISlaveState),
  93     .class_init = fsi_slave_class_init,
  94 };
  95
  96 static void fsi_register_types(void)
  97 {
  98     type_register_static(&fsi_bus_info);
  99     type_register_static(&fsi_slave_info);
 100 }
 101
 102 type_init(fsi_register_types);