1 /* 2 * QEMU Macintosh Nubus 3 * 4 * Copyright (c) 2013-2018 Laurent Vivier <laurent@vivier.eu> 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2 or later. 7 * See the COPYING file in the top-level directory. 8 * 9 */ 10 11 /* 12 * References: 13 * Nubus Specification (TI) 14 * http://www.bitsavers.org/pdf/ti/nubus/2242825-0001_NuBus_Spec1983.pdf 15 * 16 * Designing Cards and Drivers for the Macintosh Family (Apple) 17 */ 18 19 #include "qemu/osdep.h" 20 #include "hw/nubus/nubus.h" 21 #include "qapi/error.h" 22 #include "trace.h" 23 24 25 static NubusBus *nubus_find(void) 26 { 27 /* Returns NULL unless there is exactly one nubus device */ 28 return NUBUS_BUS(object_resolve_path_type("", TYPE_NUBUS_BUS, NULL)); 29 } 30 31 static MemTxResult nubus_slot_write(void *opaque, hwaddr addr, uint64_t val, 32 unsigned size, MemTxAttrs attrs) 33 { 34 trace_nubus_slot_write(addr, val, size); 35 return MEMTX_DECODE_ERROR; 36 } 37 38 static MemTxResult nubus_slot_read(void *opaque, hwaddr addr, uint64_t *data, 39 unsigned size, MemTxAttrs attrs) 40 { 41 trace_nubus_slot_read(addr, size); 42 return MEMTX_DECODE_ERROR; 43 } 44 45 static const MemoryRegionOps nubus_slot_ops = { 46 .read_with_attrs = nubus_slot_read, 47 .write_with_attrs = nubus_slot_write, 48 .endianness = DEVICE_BIG_ENDIAN, 49 .valid = { 50 .min_access_size = 1, 51 .max_access_size = 4, 52 }, 53 }; 54 55 static MemTxResult nubus_super_slot_write(void *opaque, hwaddr addr, 56 uint64_t val, unsigned size, 57 MemTxAttrs attrs) 58 { 59 trace_nubus_super_slot_write(addr, val, size); 60 return MEMTX_DECODE_ERROR; 61 } 62 63 static MemTxResult nubus_super_slot_read(void *opaque, hwaddr addr, 64 uint64_t *data, unsigned size, 65 MemTxAttrs attrs) 66 { 67 trace_nubus_super_slot_read(addr, size); 68 return MEMTX_DECODE_ERROR; 69 } 70 71 static const MemoryRegionOps nubus_super_slot_ops = { 72 .read_with_attrs = nubus_super_slot_read, 73 .write_with_attrs = nubus_super_slot_write, 74 .endianness = DEVICE_BIG_ENDIAN, 75 .valid = { 76 .min_access_size = 1, 77 .max_access_size = 4, 78 }, 79 }; 80 81 static void nubus_realize(BusState *bus, Error **errp) 82 { 83 if (!nubus_find()) { 84 error_setg(errp, "at most one %s device is permitted", TYPE_NUBUS_BUS); 85 return; 86 } 87 } 88 89 static void nubus_init(Object *obj) 90 { 91 NubusBus *nubus = NUBUS_BUS(obj); 92 93 memory_region_init_io(&nubus->super_slot_io, obj, &nubus_super_slot_ops, 94 nubus, "nubus-super-slots", 95 (NUBUS_SUPER_SLOT_NB + 1) * NUBUS_SUPER_SLOT_SIZE); 96 97 memory_region_init_io(&nubus->slot_io, obj, &nubus_slot_ops, 98 nubus, "nubus-slots", 99 NUBUS_SLOT_NB * NUBUS_SLOT_SIZE); 100 101 nubus->slot_available_mask = MAKE_64BIT_MASK(NUBUS_FIRST_SLOT, 102 NUBUS_SLOT_NB); 103 } 104 105 static char *nubus_get_dev_path(DeviceState *dev) 106 { 107 NubusDevice *nd = NUBUS_DEVICE(dev); 108 BusState *bus = qdev_get_parent_bus(dev); 109 char *p = qdev_get_dev_path(bus->parent); 110 111 if (p) { 112 char *ret = g_strdup_printf("%s/%s/%02x", p, bus->name, nd->slot); 113 g_free(p); 114 return ret; 115 } else { 116 return g_strdup_printf("%s/%02x", bus->name, nd->slot); 117 } 118 } 119 120 static bool nubus_check_address(BusState *bus, DeviceState *dev, Error **errp) 121 { 122 NubusDevice *nd = NUBUS_DEVICE(dev); 123 NubusBus *nubus = NUBUS_BUS(bus); 124 125 if (nd->slot == -1) { 126 /* No slot specified, find first available free slot */ 127 int s = ctz32(nubus->slot_available_mask); 128 if (s != 32) { 129 nd->slot = s; 130 } else { 131 error_setg(errp, "Cannot register nubus card, no free slot " 132 "available"); 133 return false; 134 } 135 } else { 136 /* Slot specified, make sure the slot is available */ 137 if (!(nubus->slot_available_mask & BIT(nd->slot))) { 138 error_setg(errp, "Cannot register nubus card, slot %d is " 139 "unavailable or already occupied", nd->slot); 140 return false; 141 } 142 } 143 144 nubus->slot_available_mask &= ~BIT(nd->slot); 145 return true; 146 } 147 148 static void nubus_class_init(ObjectClass *oc, void *data) 149 { 150 BusClass *bc = BUS_CLASS(oc); 151 152 bc->realize = nubus_realize; 153 bc->check_address = nubus_check_address; 154 bc->get_dev_path = nubus_get_dev_path; 155 } 156 157 static const TypeInfo nubus_bus_info = { 158 .name = TYPE_NUBUS_BUS, 159 .parent = TYPE_BUS, 160 .instance_size = sizeof(NubusBus), 161 .instance_init = nubus_init, 162 .class_init = nubus_class_init, 163 }; 164 165 static void nubus_register_types(void) 166 { 167 type_register_static(&nubus_bus_info); 168 } 169 170 type_init(nubus_register_types) 171