diff options
Diffstat (limited to 'hw/dma/i82374.c')
| -rw-r--r-- | hw/dma/i82374.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/hw/dma/i82374.c b/hw/dma/i82374.c new file mode 100644 index 000000000..34c3aaf7d --- /dev/null +++ b/hw/dma/i82374.c @@ -0,0 +1,168 @@ +/* + * QEMU Intel 82374 emulation (Enhanced DMA controller) + * + * Copyright (c) 2010 Hervé Poussineau + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "qemu/module.h" +#include "hw/isa/isa.h" +#include "hw/qdev-properties.h" +#include "migration/vmstate.h" +#include "hw/dma/i8257.h" +#include "qom/object.h" + +#define TYPE_I82374 "i82374" +OBJECT_DECLARE_SIMPLE_TYPE(I82374State, I82374) + +//#define DEBUG_I82374 + +#ifdef DEBUG_I82374 +#define DPRINTF(fmt, ...) \ +do { fprintf(stderr, "i82374: " fmt , ## __VA_ARGS__); } while (0) +#else +#define DPRINTF(fmt, ...) \ +do {} while (0) +#endif +#define BADF(fmt, ...) \ +do { fprintf(stderr, "i82374 ERROR: " fmt , ## __VA_ARGS__); } while (0) + +struct I82374State { + ISADevice parent_obj; + + uint32_t iobase; + uint8_t commands[8]; + PortioList port_list; +}; + +static const VMStateDescription vmstate_i82374 = { + .name = "i82374", + .version_id = 0, + .minimum_version_id = 0, + .fields = (VMStateField[]) { + VMSTATE_UINT8_ARRAY(commands, I82374State, 8), + VMSTATE_END_OF_LIST() + }, +}; + +static uint32_t i82374_read_isr(void *opaque, uint32_t nport) +{ + uint32_t val = 0; + + BADF("%s: %08x\n", __func__, nport); + + DPRINTF("%s: %08x=%08x\n", __func__, nport, val); + return val; +} + +static void i82374_write_command(void *opaque, uint32_t nport, uint32_t data) +{ + DPRINTF("%s: %08x=%08x\n", __func__, nport, data); + + if (data != 0x42) { + /* Not Stop S/G command */ + BADF("%s: %08x=%08x\n", __func__, nport, data); + } +} + +static uint32_t i82374_read_status(void *opaque, uint32_t nport) +{ + uint32_t val = 0; + + BADF("%s: %08x\n", __func__, nport); + + DPRINTF("%s: %08x=%08x\n", __func__, nport, val); + return val; +} + +static void i82374_write_descriptor(void *opaque, uint32_t nport, uint32_t data) +{ + DPRINTF("%s: %08x=%08x\n", __func__, nport, data); + + BADF("%s: %08x=%08x\n", __func__, nport, data); +} + +static uint32_t i82374_read_descriptor(void *opaque, uint32_t nport) +{ + uint32_t val = 0; + + BADF("%s: %08x\n", __func__, nport); + + DPRINTF("%s: %08x=%08x\n", __func__, nport, val); + return val; +} + +static const MemoryRegionPortio i82374_portio_list[] = { + { 0x0A, 1, 1, .read = i82374_read_isr, }, + { 0x10, 8, 1, .write = i82374_write_command, }, + { 0x18, 8, 1, .read = i82374_read_status, }, + { 0x20, 0x20, 1, + .write = i82374_write_descriptor, .read = i82374_read_descriptor, }, + PORTIO_END_OF_LIST(), +}; + +static void i82374_realize(DeviceState *dev, Error **errp) +{ + I82374State *s = I82374(dev); + ISABus *isa_bus = isa_bus_from_device(ISA_DEVICE(dev)); + + if (isa_get_dma(isa_bus, 0)) { + error_setg(errp, "DMA already initialized on ISA bus"); + return; + } + i8257_dma_init(isa_bus, true); + + portio_list_init(&s->port_list, OBJECT(s), i82374_portio_list, s, + "i82374"); + portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj), + s->iobase); + + memset(s->commands, 0, sizeof(s->commands)); +} + +static Property i82374_properties[] = { + DEFINE_PROP_UINT32("iobase", I82374State, iobase, 0x400), + DEFINE_PROP_END_OF_LIST() +}; + +static void i82374_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->realize = i82374_realize; + dc->vmsd = &vmstate_i82374; + device_class_set_props(dc, i82374_properties); +} + +static const TypeInfo i82374_info = { + .name = TYPE_I82374, + .parent = TYPE_ISA_DEVICE, + .instance_size = sizeof(I82374State), + .class_init = i82374_class_init, +}; + +static void i82374_register_types(void) +{ + type_register_static(&i82374_info); +} + +type_init(i82374_register_types) |