hw/misc/iosb.c

   1 /*
   2  * QEMU IOSB emulation
   3  *
   4  * Copyright (c) 2019 Laurent Vivier
   5  * Copyright (c) 2022 Mark Cave-Ayland
   6  *
   7  * SPDX-License-Identifier: GPL-2.0-or-later
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "qemu/log.h"
  12 #include "migration/vmstate.h"
  13 #include "hw/sysbus.h"
  14 #include "hw/misc/iosb.h"
  15 #include "trace.h"
  16
  17 #define IOSB_SIZE          0x2000
  18
  19 #define IOSB_CONFIG        0x0
  20 #define IOSB_CONFIG2       0x100
  21 #define IOSB_SONIC_SCSI    0x200
  22 #define IOSB_REVISION      0x300
  23 #define IOSB_SCSI_RESID    0x400
  24 #define IOSB_BRIGHTNESS    0x500
  25 #define IOSB_TIMEOUT       0x600
  26
  27
  28 static uint64_t iosb_read(void *opaque, hwaddr addr,
  29                           unsigned size)
  30 {
  31     IOSBState *s = IOSB(opaque);
  32     uint64_t val = 0;
  33
  34     switch (addr) {
  35     case IOSB_CONFIG:
  36     case IOSB_CONFIG2:
  37     case IOSB_SONIC_SCSI:
  38     case IOSB_REVISION:
  39     case IOSB_SCSI_RESID:
  40     case IOSB_BRIGHTNESS:
  41     case IOSB_TIMEOUT:
  42         val = s->regs[addr >> 8];
  43         break;
  44     default:
  45         qemu_log_mask(LOG_UNIMP, "IOSB: unimplemented read addr=0x%"PRIx64
  46                                  " val=0x%"PRIx64 " size=%d\n",
  47                                  addr, val, size);
  48     }
  49
  50     trace_iosb_read(addr, val, size);
  51     return val;
  52 }
  53
  54 static void iosb_write(void *opaque, hwaddr addr, uint64_t val,
  55                        unsigned size)
  56 {
  57     IOSBState *s = IOSB(opaque);
  58
  59     switch (addr) {
  60     case IOSB_CONFIG:
  61     case IOSB_CONFIG2:
  62     case IOSB_SONIC_SCSI:
  63     case IOSB_REVISION:
  64     case IOSB_SCSI_RESID:
  65     case IOSB_BRIGHTNESS:
  66     case IOSB_TIMEOUT:
  67         s->regs[addr >> 8] = val;
  68         break;
  69     default:
  70         qemu_log_mask(LOG_UNIMP, "IOSB: unimplemented write addr=0x%"PRIx64
  71                                  " val=0x%"PRIx64 " size=%d\n",
  72                                  addr, val, size);
  73     }
  74
  75     trace_iosb_write(addr, val, size);
  76 }
  77
  78 static const MemoryRegionOps iosb_mmio_ops = {
  79     .read = iosb_read,
  80     .write = iosb_write,
  81     .endianness = DEVICE_BIG_ENDIAN,
  82 };
  83
  84 static void iosb_reset_hold(Object *obj, ResetType type)
  85 {
  86     IOSBState *s = IOSB(obj);
  87
  88     memset(s->regs, 0, sizeof(s->regs));
  89
  90     /* BCLK 33 MHz */
  91     s->regs[IOSB_CONFIG >> 8] = 1;
  92 }
  93
  94 static void iosb_init(Object *obj)
  95 {
  96     IOSBState *s = IOSB(obj);
  97     SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
  98
  99     memory_region_init_io(&s->mem_regs, obj, &iosb_mmio_ops, s, "IOSB",
 100                           IOSB_SIZE);
 101     sysbus_init_mmio(sbd, &s->mem_regs);
 102 }
 103
 104 static const VMStateDescription vmstate_iosb = {
 105     .name = "IOSB",
 106     .version_id = 1,
 107     .minimum_version_id = 1,
 108     .fields = (const VMStateField[]) {
 109         VMSTATE_UINT32_ARRAY(regs, IOSBState, IOSB_REGS),
 110         VMSTATE_END_OF_LIST()
 111     }
 112 };
 113
 114 static void iosb_class_init(ObjectClass *oc, void *data)
 115 {
 116     DeviceClass *dc = DEVICE_CLASS(oc);
 117     ResettableClass *rc = RESETTABLE_CLASS(oc);
 118
 119     dc->vmsd = &vmstate_iosb;
 120     rc->phases.hold = iosb_reset_hold;
 121 }
 122
 123 static const TypeInfo iosb_info_types[] = {
 124     {
 125         .name          = TYPE_IOSB,
 126         .parent        = TYPE_SYS_BUS_DEVICE,
 127         .instance_size = sizeof(IOSBState),
 128         .instance_init = iosb_init,
 129         .class_init    = iosb_class_init,
 130     },
 131 };
 132
 133 DEFINE_TYPES(iosb_info_types)