diff options
Diffstat (limited to 'hw/nubus/nubus-bus.c')
| -rw-r--r-- | hw/nubus/nubus-bus.c | 120 |
1 files changed, 99 insertions, 21 deletions
diff --git a/hw/nubus/nubus-bus.c b/hw/nubus/nubus-bus.c index 5c13452..07c279b 100644 --- a/hw/nubus/nubus-bus.c +++ b/hw/nubus/nubus-bus.c @@ -8,9 +8,18 @@ * */ +/* + * References: + * Nubus Specification (TI) + * http://www.bitsavers.org/pdf/ti/nubus/2242825-0001_NuBus_Spec1983.pdf + * + * Designing Cards and Drivers for the Macintosh Family (Apple) + */ + #include "qemu/osdep.h" #include "hw/nubus/nubus.h" #include "qapi/error.h" +#include "trace.h" static NubusBus *nubus_find(void) @@ -19,72 +28,138 @@ static NubusBus *nubus_find(void) return NUBUS_BUS(object_resolve_path_type("", TYPE_NUBUS_BUS, NULL)); } -static void nubus_slot_write(void *opaque, hwaddr addr, uint64_t val, - unsigned int size) +static MemTxResult nubus_slot_write(void *opaque, hwaddr addr, uint64_t val, + unsigned size, MemTxAttrs attrs) { - /* read only */ + trace_nubus_slot_write(addr, val, size); + return MEMTX_DECODE_ERROR; } - -static uint64_t nubus_slot_read(void *opaque, hwaddr addr, - unsigned int size) +static MemTxResult nubus_slot_read(void *opaque, hwaddr addr, uint64_t *data, + unsigned size, MemTxAttrs attrs) { - return 0; + trace_nubus_slot_read(addr, size); + return MEMTX_DECODE_ERROR; } static const MemoryRegionOps nubus_slot_ops = { - .read = nubus_slot_read, - .write = nubus_slot_write, + .read_with_attrs = nubus_slot_read, + .write_with_attrs = nubus_slot_write, .endianness = DEVICE_BIG_ENDIAN, .valid = { .min_access_size = 1, - .max_access_size = 1, + .max_access_size = 4, }, }; -static void nubus_super_slot_write(void *opaque, hwaddr addr, uint64_t val, - unsigned int size) +static MemTxResult nubus_super_slot_write(void *opaque, hwaddr addr, + uint64_t val, unsigned size, + MemTxAttrs attrs) { - /* read only */ + trace_nubus_super_slot_write(addr, val, size); + return MEMTX_DECODE_ERROR; } -static uint64_t nubus_super_slot_read(void *opaque, hwaddr addr, - unsigned int size) +static MemTxResult nubus_super_slot_read(void *opaque, hwaddr addr, + uint64_t *data, unsigned size, + MemTxAttrs attrs) { - return 0; + trace_nubus_super_slot_read(addr, size); + return MEMTX_DECODE_ERROR; } static const MemoryRegionOps nubus_super_slot_ops = { - .read = nubus_super_slot_read, - .write = nubus_super_slot_write, + .read_with_attrs = nubus_super_slot_read, + .write_with_attrs = nubus_super_slot_write, .endianness = DEVICE_BIG_ENDIAN, .valid = { .min_access_size = 1, - .max_access_size = 1, + .max_access_size = 4, }, }; +static void nubus_unrealize(BusState *bus) +{ + NubusBus *nubus = NUBUS_BUS(bus); + + address_space_destroy(&nubus->nubus_as); +} + static void nubus_realize(BusState *bus, Error **errp) { + NubusBus *nubus = NUBUS_BUS(bus); + if (!nubus_find()) { error_setg(errp, "at most one %s device is permitted", TYPE_NUBUS_BUS); return; } + + address_space_init(&nubus->nubus_as, &nubus->nubus_mr, "nubus"); } static void nubus_init(Object *obj) { NubusBus *nubus = NUBUS_BUS(obj); + memory_region_init(&nubus->nubus_mr, obj, "nubus", 0x100000000); + memory_region_init_io(&nubus->super_slot_io, obj, &nubus_super_slot_ops, nubus, "nubus-super-slots", - NUBUS_SUPER_SLOT_NB * NUBUS_SUPER_SLOT_SIZE); + (NUBUS_SUPER_SLOT_NB + 1) * NUBUS_SUPER_SLOT_SIZE); + memory_region_add_subregion(&nubus->nubus_mr, 0x0, &nubus->super_slot_io); memory_region_init_io(&nubus->slot_io, obj, &nubus_slot_ops, nubus, "nubus-slots", NUBUS_SLOT_NB * NUBUS_SLOT_SIZE); + memory_region_add_subregion(&nubus->nubus_mr, + (NUBUS_SUPER_SLOT_NB + 1) * + NUBUS_SUPER_SLOT_SIZE, &nubus->slot_io); + + nubus->slot_available_mask = MAKE_64BIT_MASK(NUBUS_FIRST_SLOT, + NUBUS_SLOT_NB); +} + +static char *nubus_get_dev_path(DeviceState *dev) +{ + NubusDevice *nd = NUBUS_DEVICE(dev); + BusState *bus = qdev_get_parent_bus(dev); + char *p = qdev_get_dev_path(bus->parent); + + if (p) { + char *ret = g_strdup_printf("%s/%s/%02x", p, bus->name, nd->slot); + g_free(p); + return ret; + } else { + return g_strdup_printf("%s/%02x", bus->name, nd->slot); + } +} + +static bool nubus_check_address(BusState *bus, DeviceState *dev, Error **errp) +{ + NubusDevice *nd = NUBUS_DEVICE(dev); + NubusBus *nubus = NUBUS_BUS(bus); + + if (nd->slot == -1) { + /* No slot specified, find first available free slot */ + int s = ctz32(nubus->slot_available_mask); + if (s != 32) { + nd->slot = s; + } else { + error_setg(errp, "Cannot register nubus card, no free slot " + "available"); + return false; + } + } else { + /* Slot specified, make sure the slot is available */ + if (!(nubus->slot_available_mask & BIT(nd->slot))) { + error_setg(errp, "Cannot register nubus card, slot %d is " + "unavailable or already occupied", nd->slot); + return false; + } + } - nubus->current_slot = NUBUS_FIRST_SLOT; + nubus->slot_available_mask &= ~BIT(nd->slot); + return true; } static void nubus_class_init(ObjectClass *oc, void *data) @@ -92,6 +167,9 @@ static void nubus_class_init(ObjectClass *oc, void *data) BusClass *bc = BUS_CLASS(oc); bc->realize = nubus_realize; + bc->unrealize = nubus_unrealize; + bc->check_address = nubus_check_address; + bc->get_dev_path = nubus_get_dev_path; } static const TypeInfo nubus_bus_info = { |