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/*
* QEMU Macintosh Nubus
*
* Copyright (c) 2013-2018 Laurent Vivier <laurent@vivier.eu>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "hw/nubus/nubus.h"
#include "qapi/error.h"
/* The Format Block Structure */
#define FBLOCK_DIRECTORY_OFFSET 0
#define FBLOCK_LENGTH 4
#define FBLOCK_CRC 8
#define FBLOCK_REVISION_LEVEL 12
#define FBLOCK_FORMAT 13
#define FBLOCK_TEST_PATTERN 14
#define FBLOCK_RESERVED 18
#define FBLOCK_BYTE_LANES 19
#define FBLOCK_SIZE 20
#define FBLOCK_PATTERN_VAL 0x5a932bc7
static uint64_t nubus_fblock_read(void *opaque, hwaddr addr, unsigned int size)
{
NubusDevice *dev = opaque;
uint64_t val;
#define BYTE(v, b) (((v) >> (24 - 8 * (b))) & 0xff)
switch (addr) {
case FBLOCK_BYTE_LANES:
val = dev->byte_lanes;
val |= (val ^ 0xf) << 4;
break;
case FBLOCK_RESERVED:
val = 0x00;
break;
case FBLOCK_TEST_PATTERN...FBLOCK_TEST_PATTERN + 3:
val = BYTE(FBLOCK_PATTERN_VAL, addr - FBLOCK_TEST_PATTERN);
break;
case FBLOCK_FORMAT:
val = dev->rom_format;
break;
case FBLOCK_REVISION_LEVEL:
val = dev->rom_rev;
break;
case FBLOCK_CRC...FBLOCK_CRC + 3:
val = BYTE(dev->rom_crc, addr - FBLOCK_CRC);
break;
case FBLOCK_LENGTH...FBLOCK_LENGTH + 3:
val = BYTE(dev->rom_length, addr - FBLOCK_LENGTH);
break;
case FBLOCK_DIRECTORY_OFFSET...FBLOCK_DIRECTORY_OFFSET + 3:
val = BYTE(dev->directory_offset, addr - FBLOCK_DIRECTORY_OFFSET);
break;
default:
val = 0;
break;
}
return val;
}
static void nubus_fblock_write(void *opaque, hwaddr addr, uint64_t val,
unsigned int size)
{
/* read only */
}
static const MemoryRegionOps nubus_format_block_ops = {
.read = nubus_fblock_read,
.write = nubus_fblock_write,
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 1,
}
};
static void nubus_register_format_block(NubusDevice *dev)
{
char *fblock_name;
fblock_name = g_strdup_printf("nubus-slot-%d-format-block",
dev->slot);
hwaddr fblock_offset = memory_region_size(&dev->slot_mem) - FBLOCK_SIZE;
memory_region_init_io(&dev->fblock_io, NULL, &nubus_format_block_ops,
dev, fblock_name, FBLOCK_SIZE);
memory_region_add_subregion(&dev->slot_mem, fblock_offset,
&dev->fblock_io);
g_free(fblock_name);
}
static void mac_nubus_rom_write(void *opaque, hwaddr addr, uint64_t val,
unsigned int size)
{
/* read only */
}
static uint64_t mac_nubus_rom_read(void *opaque, hwaddr addr,
unsigned int size)
{
NubusDevice *dev = opaque;
return dev->rom[addr];
}
static const MemoryRegionOps mac_nubus_rom_ops = {
.read = mac_nubus_rom_read,
.write = mac_nubus_rom_write,
.endianness = DEVICE_BIG_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 1,
},
};
void nubus_register_rom(NubusDevice *dev, const uint8_t *rom, uint32_t size,
int revision, int format, uint8_t byte_lanes)
{
hwaddr rom_offset;
char *rom_name;
/* FIXME : really compute CRC */
dev->rom_length = 0;
dev->rom_crc = 0;
dev->rom_rev = revision;
dev->rom_format = format;
dev->byte_lanes = byte_lanes;
dev->directory_offset = -size;
/* ROM */
dev->rom = rom;
rom_name = g_strdup_printf("nubus-slot-%d-rom", dev->slot);
memory_region_init_io(&dev->rom_io, NULL, &mac_nubus_rom_ops,
dev, rom_name, size);
memory_region_set_readonly(&dev->rom_io, true);
rom_offset = memory_region_size(&dev->slot_mem) - FBLOCK_SIZE +
dev->directory_offset;
memory_region_add_subregion(&dev->slot_mem, rom_offset, &dev->rom_io);
g_free(rom_name);
}
static void nubus_device_realize(DeviceState *dev, Error **errp)
{
NubusBus *nubus = NUBUS_BUS(qdev_get_parent_bus(dev));
NubusDevice *nd = NUBUS_DEVICE(dev);
char *name;
hwaddr slot_offset;
if (nubus->current_slot < NUBUS_FIRST_SLOT ||
nubus->current_slot > NUBUS_LAST_SLOT) {
error_setg(errp, "Cannot register nubus card, not enough slots");
return;
}
nd->slot = nubus->current_slot++;
name = g_strdup_printf("nubus-slot-%d", nd->slot);
if (nd->slot < NUBUS_FIRST_SLOT) {
/* Super */
slot_offset = (nd->slot - 6) * NUBUS_SUPER_SLOT_SIZE;
memory_region_init(&nd->slot_mem, OBJECT(dev), name,
NUBUS_SUPER_SLOT_SIZE);
memory_region_add_subregion(&nubus->super_slot_io, slot_offset,
&nd->slot_mem);
} else {
/* Normal */
slot_offset = nd->slot * NUBUS_SLOT_SIZE;
memory_region_init(&nd->slot_mem, OBJECT(dev), name, NUBUS_SLOT_SIZE);
memory_region_add_subregion(&nubus->slot_io, slot_offset,
&nd->slot_mem);
}
g_free(name);
nubus_register_format_block(nd);
}
static void nubus_device_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->realize = nubus_device_realize;
dc->bus_type = TYPE_NUBUS_BUS;
}
static const TypeInfo nubus_device_type_info = {
.name = TYPE_NUBUS_DEVICE,
.parent = TYPE_DEVICE,
.abstract = true,
.instance_size = sizeof(NubusDevice),
.class_init = nubus_device_class_init,
};
static void nubus_register_types(void)
{
type_register_static(&nubus_device_type_info);
}
type_init(nubus_register_types)
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