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serial-pci-multi.c
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serial-pci-multi.c
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/*
* QEMU 16550A multi UART emulation
*
* SPDX-License-Identifier: MIT
*
* Copyright (c) 2003-2004 Fabrice Bellard
* Copyright (c) 2008 Citrix Systems, Inc.
*
* 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.
*/
/* see docs/specs/pci-serial.txt */
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/char/serial.h"
#include "hw/pci/pci.h"
#define PCI_SERIAL_MAX_PORTS 4
typedef struct PCIMultiSerialState {
PCIDevice dev;
MemoryRegion iobar;
uint32_t ports;
char *name[PCI_SERIAL_MAX_PORTS];
SerialState state[PCI_SERIAL_MAX_PORTS];
uint32_t level[PCI_SERIAL_MAX_PORTS];
qemu_irq *irqs;
uint8_t prog_if;
} PCIMultiSerialState;
static void multi_serial_pci_exit(PCIDevice *dev)
{
PCIMultiSerialState *pci = DO_UPCAST(PCIMultiSerialState, dev, dev);
SerialState *s;
int i;
for (i = 0; i < pci->ports; i++) {
s = pci->state + i;
serial_exit_core(s);
memory_region_del_subregion(&pci->iobar, &s->io);
g_free(pci->name[i]);
}
qemu_free_irqs(pci->irqs, pci->ports);
}
static void multi_serial_irq_mux(void *opaque, int n, int level)
{
PCIMultiSerialState *pci = opaque;
int i, pending = 0;
pci->level[n] = level;
for (i = 0; i < pci->ports; i++) {
if (pci->level[i]) {
pending = 1;
}
}
pci_set_irq(&pci->dev, pending);
}
static void multi_serial_pci_realize(PCIDevice *dev, Error **errp)
{
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
PCIMultiSerialState *pci = DO_UPCAST(PCIMultiSerialState, dev, dev);
SerialState *s;
Error *err = NULL;
int i, nr_ports = 0;
switch (pc->device_id) {
case 0x0003:
nr_ports = 2;
break;
case 0x0004:
nr_ports = 4;
break;
}
assert(nr_ports > 0);
assert(nr_ports <= PCI_SERIAL_MAX_PORTS);
pci->dev.config[PCI_CLASS_PROG] = pci->prog_if;
pci->dev.config[PCI_INTERRUPT_PIN] = 0x01;
memory_region_init(&pci->iobar, OBJECT(pci), "multiserial", 8 * nr_ports);
pci_register_bar(&pci->dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &pci->iobar);
pci->irqs = qemu_allocate_irqs(multi_serial_irq_mux, pci,
nr_ports);
for (i = 0; i < nr_ports; i++) {
s = pci->state + i;
s->baudbase = 115200;
serial_realize_core(s, &err);
if (err != NULL) {
error_propagate(errp, err);
multi_serial_pci_exit(dev);
return;
}
s->irq = pci->irqs[i];
pci->name[i] = g_strdup_printf("uart #%d", i + 1);
memory_region_init_io(&s->io, OBJECT(pci), &serial_io_ops, s,
pci->name[i], 8);
memory_region_add_subregion(&pci->iobar, 8 * i, &s->io);
pci->ports++;
}
}
static const VMStateDescription vmstate_pci_multi_serial = {
.name = "pci-serial-multi",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_PCI_DEVICE(dev, PCIMultiSerialState),
VMSTATE_STRUCT_ARRAY(state, PCIMultiSerialState, PCI_SERIAL_MAX_PORTS,
0, vmstate_serial, SerialState),
VMSTATE_UINT32_ARRAY(level, PCIMultiSerialState, PCI_SERIAL_MAX_PORTS),
VMSTATE_END_OF_LIST()
}
};
static Property multi_2x_serial_pci_properties[] = {
DEFINE_PROP_CHR("chardev1", PCIMultiSerialState, state[0].chr),
DEFINE_PROP_CHR("chardev2", PCIMultiSerialState, state[1].chr),
DEFINE_PROP_UINT8("prog_if", PCIMultiSerialState, prog_if, 0x02),
DEFINE_PROP_END_OF_LIST(),
};
static Property multi_4x_serial_pci_properties[] = {
DEFINE_PROP_CHR("chardev1", PCIMultiSerialState, state[0].chr),
DEFINE_PROP_CHR("chardev2", PCIMultiSerialState, state[1].chr),
DEFINE_PROP_CHR("chardev3", PCIMultiSerialState, state[2].chr),
DEFINE_PROP_CHR("chardev4", PCIMultiSerialState, state[3].chr),
DEFINE_PROP_UINT8("prog_if", PCIMultiSerialState, prog_if, 0x02),
DEFINE_PROP_END_OF_LIST(),
};
static void multi_2x_serial_pci_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *pc = PCI_DEVICE_CLASS(klass);
pc->realize = multi_serial_pci_realize;
pc->exit = multi_serial_pci_exit;
pc->vendor_id = PCI_VENDOR_ID_REDHAT;
pc->device_id = PCI_DEVICE_ID_REDHAT_SERIAL2;
pc->revision = 1;
pc->class_id = PCI_CLASS_COMMUNICATION_SERIAL;
dc->vmsd = &vmstate_pci_multi_serial;
dc->props = multi_2x_serial_pci_properties;
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
}
static void multi_4x_serial_pci_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *pc = PCI_DEVICE_CLASS(klass);
pc->realize = multi_serial_pci_realize;
pc->exit = multi_serial_pci_exit;
pc->vendor_id = PCI_VENDOR_ID_REDHAT;
pc->device_id = PCI_DEVICE_ID_REDHAT_SERIAL4;
pc->revision = 1;
pc->class_id = PCI_CLASS_COMMUNICATION_SERIAL;
dc->vmsd = &vmstate_pci_multi_serial;
dc->props = multi_4x_serial_pci_properties;
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
}
static const TypeInfo multi_2x_serial_pci_info = {
.name = "pci-serial-2x",
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(PCIMultiSerialState),
.class_init = multi_2x_serial_pci_class_initfn,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static const TypeInfo multi_4x_serial_pci_info = {
.name = "pci-serial-4x",
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(PCIMultiSerialState),
.class_init = multi_4x_serial_pci_class_initfn,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static void multi_serial_pci_register_types(void)
{
type_register_static(&multi_2x_serial_pci_info);
type_register_static(&multi_4x_serial_pci_info);
}
type_init(multi_serial_pci_register_types)