hw/fsi/fsi-master.c

   1 /*
   2  * SPDX-License-Identifier: GPL-2.0-or-later
   3  * Copyright (C) 2024 IBM Corp.
   4  *
   5  * IBM Flexible Service Interface master
   6  */
   7
   8 #include "qemu/osdep.h"
   9 #include "qapi/error.h"
  10 #include "qemu/log.h"
  11 #include "trace.h"
  12
  13 #include "hw/fsi/fsi-master.h"
  14
  15 #define TYPE_OP_BUS "opb"
  16
  17 #define TO_REG(x)                               ((x) >> 2)
  18
  19 #define FSI_MENP0                               TO_REG(0x010)
  20 #define FSI_MENP32                              TO_REG(0x014)
  21 #define FSI_MSENP0                              TO_REG(0x018)
  22 #define FSI_MLEVP0                              TO_REG(0x018)
  23 #define FSI_MSENP32                             TO_REG(0x01c)
  24 #define FSI_MLEVP32                             TO_REG(0x01c)
  25 #define FSI_MCENP0                              TO_REG(0x020)
  26 #define FSI_MREFP0                              TO_REG(0x020)
  27 #define FSI_MCENP32                             TO_REG(0x024)
  28 #define FSI_MREFP32                             TO_REG(0x024)
  29
  30 #define FSI_MVER                                TO_REG(0x074)
  31 #define FSI_MRESP0                              TO_REG(0x0d0)
  32
  33 #define FSI_MRESB0                              TO_REG(0x1d0)
  34 #define   FSI_MRESB0_RESET_GENERAL              BIT(31)
  35 #define   FSI_MRESB0_RESET_ERROR                BIT(30)
  36
  37 static uint64_t fsi_master_read(void *opaque, hwaddr addr, unsigned size)
  38 {
  39     FSIMasterState *s = FSI_MASTER(opaque);
  40     int reg = TO_REG(addr);
  41
  42     trace_fsi_master_read(addr, size);
  43
  44     if (reg >= FSI_MASTER_NR_REGS) {
  45         qemu_log_mask(LOG_GUEST_ERROR,
  46                       "%s: Out of bounds read: 0x%"HWADDR_PRIx" for %u\n",
  47                       __func__, addr, size);
  48         return 0;
  49     }
  50
  51     return s->regs[reg];
  52 }
  53
  54 static void fsi_master_write(void *opaque, hwaddr addr, uint64_t data,
  55                              unsigned size)
  56 {
  57     FSIMasterState *s = FSI_MASTER(opaque);
  58     int reg = TO_REG(addr);
  59
  60     trace_fsi_master_write(addr, size, data);
  61
  62     if (reg >= FSI_MASTER_NR_REGS) {
  63         qemu_log_mask(LOG_GUEST_ERROR,
  64                       "%s: Out of bounds write: %"HWADDR_PRIx" for %u\n",
  65                       __func__, addr, size);
  66         return;
  67     }
  68
  69     switch (reg) {
  70     case FSI_MENP0:
  71         s->regs[FSI_MENP0] = data;
  72         break;
  73     case FSI_MENP32:
  74         s->regs[FSI_MENP32] = data;
  75         break;
  76     case FSI_MSENP0:
  77         s->regs[FSI_MENP0] |= data;
  78         break;
  79     case FSI_MSENP32:
  80         s->regs[FSI_MENP32] |= data;
  81         break;
  82     case FSI_MCENP0:
  83         s->regs[FSI_MENP0] &= ~data;
  84         break;
  85     case FSI_MCENP32:
  86         s->regs[FSI_MENP32] &= ~data;
  87         break;
  88     case FSI_MRESP0:
  89         /* Perform necessary resets leave register 0 to indicate no errors */
  90         break;
  91     case FSI_MRESB0:
  92         if (data & FSI_MRESB0_RESET_GENERAL) {
  93             device_cold_reset(DEVICE(opaque));
  94         }
  95         if (data & FSI_MRESB0_RESET_ERROR) {
  96             /* FIXME: this seems dubious */
  97             device_cold_reset(DEVICE(opaque));
  98         }
  99         break;
 100     default:
 101         s->regs[reg] = data;
 102     }
 103 }
 104
 105 static const struct MemoryRegionOps fsi_master_ops = {
 106     .read = fsi_master_read,
 107     .write = fsi_master_write,
 108     .endianness = DEVICE_BIG_ENDIAN,
 109 };
 110
 111 static void fsi_master_init(Object *o)
 112 {
 113     FSIMasterState *s = FSI_MASTER(o);
 114
 115     object_initialize_child(o, "cfam", &s->cfam, TYPE_FSI_CFAM);
 116
 117     qbus_init(&s->bus, sizeof(s->bus), TYPE_FSI_BUS, DEVICE(s), NULL);
 118
 119     memory_region_init_io(&s->iomem, OBJECT(s), &fsi_master_ops, s,
 120                           TYPE_FSI_MASTER, 0x10000000);
 121     memory_region_init(&s->opb2fsi, OBJECT(s), "fsi.opb2fsi", 0x10000000);
 122 }
 123
 124 static void fsi_master_realize(DeviceState *dev, Error **errp)
 125 {
 126     FSIMasterState *s = FSI_MASTER(dev);
 127
 128     if (!qdev_realize(DEVICE(&s->cfam), BUS(&s->bus), errp)) {
 129         return;
 130     }
 131
 132     /* address ? */
 133     memory_region_add_subregion(&s->opb2fsi, 0, &s->cfam.mr);
 134 }
 135
 136 static void fsi_master_reset(DeviceState *dev)
 137 {
 138     FSIMasterState *s = FSI_MASTER(dev);
 139
 140     /* Initialize registers */
 141     memset(s->regs, 0, sizeof(s->regs));
 142
 143     /* ASPEED default */
 144     s->regs[FSI_MVER] = 0xe0050101;
 145 }
 146
 147 static void fsi_master_class_init(ObjectClass *klass, void *data)
 148 {
 149     DeviceClass *dc = DEVICE_CLASS(klass);
 150
 151     dc->bus_type = TYPE_OP_BUS;
 152     dc->desc = "FSI Master";
 153     dc->realize = fsi_master_realize;
 154     dc->reset = fsi_master_reset;
 155 }
 156
 157 static const TypeInfo fsi_master_info = {
 158     .name = TYPE_FSI_MASTER,
 159     .parent = TYPE_DEVICE,
 160     .instance_init = fsi_master_init,
 161     .instance_size = sizeof(FSIMasterState),
 162     .class_init = fsi_master_class_init,
 163 };
 164
 165 static void fsi_register_types(void)
 166 {
 167     type_register_static(&fsi_master_info);
 168 }
 169
 170 type_init(fsi_register_types);