Nothing prevented IRQ sharing on the ISA bus in principle. Not all boards supported this, neither each and every card nor driver and OS. Still, there existed valid IRQ sharing scenarios, (at least) two of them can also be found in QEMU: >2 PC UARTs and the PREP IDE buses. So remove this artificial restriction from our ISA model. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
207 lines
5.1 KiB
C
207 lines
5.1 KiB
C
/*
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* isa bus support for qdev.
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*
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* Copyright (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "hw.h"
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#include "sysemu.h"
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#include "monitor.h"
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#include "sysbus.h"
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#include "isa.h"
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struct ISABus {
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BusState qbus;
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qemu_irq *irqs;
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};
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static ISABus *isabus;
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target_phys_addr_t isa_mem_base = 0;
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static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
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static char *isabus_get_fw_dev_path(DeviceState *dev);
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static struct BusInfo isa_bus_info = {
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.name = "ISA",
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.size = sizeof(ISABus),
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.print_dev = isabus_dev_print,
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.get_fw_dev_path = isabus_get_fw_dev_path,
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};
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ISABus *isa_bus_new(DeviceState *dev)
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{
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if (isabus) {
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fprintf(stderr, "Can't create a second ISA bus\n");
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return NULL;
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}
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if (NULL == dev) {
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dev = qdev_create(NULL, "isabus-bridge");
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qdev_init_nofail(dev);
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}
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isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
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return isabus;
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}
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void isa_bus_irqs(qemu_irq *irqs)
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{
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isabus->irqs = irqs;
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}
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/*
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* isa_get_irq() returns the corresponding qemu_irq entry for the i8259.
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*
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* This function is only for special cases such as the 'ferr', and
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* temporary use for normal devices until they are converted to qdev.
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*/
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qemu_irq isa_get_irq(int isairq)
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{
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if (isairq < 0 || isairq > 15) {
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hw_error("isa irq %d invalid", isairq);
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}
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return isabus->irqs[isairq];
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}
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void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq)
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{
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assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
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dev->isairq[dev->nirqs] = isairq;
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*p = isa_get_irq(isairq);
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dev->nirqs++;
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}
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static void isa_init_ioport_one(ISADevice *dev, uint16_t ioport)
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{
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assert(dev->nioports < ARRAY_SIZE(dev->ioports));
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dev->ioports[dev->nioports++] = ioport;
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}
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static int isa_cmp_ports(const void *p1, const void *p2)
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{
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return *(uint16_t*)p1 - *(uint16_t*)p2;
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}
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void isa_init_ioport_range(ISADevice *dev, uint16_t start, uint16_t length)
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{
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int i;
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for (i = start; i < start + length; i++) {
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isa_init_ioport_one(dev, i);
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}
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qsort(dev->ioports, dev->nioports, sizeof(dev->ioports[0]), isa_cmp_ports);
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}
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void isa_init_ioport(ISADevice *dev, uint16_t ioport)
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{
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isa_init_ioport_range(dev, ioport, 1);
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}
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static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
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{
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ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
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ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
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dev->isairq[0] = -1;
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dev->isairq[1] = -1;
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return info->init(dev);
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}
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void isa_qdev_register(ISADeviceInfo *info)
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{
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info->qdev.init = isa_qdev_init;
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info->qdev.bus_info = &isa_bus_info;
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qdev_register(&info->qdev);
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}
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ISADevice *isa_create(const char *name)
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{
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DeviceState *dev;
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if (!isabus) {
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hw_error("Tried to create isa device %s with no isa bus present.",
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name);
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}
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dev = qdev_create(&isabus->qbus, name);
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return DO_UPCAST(ISADevice, qdev, dev);
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}
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ISADevice *isa_try_create(const char *name)
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{
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DeviceState *dev;
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if (!isabus) {
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hw_error("Tried to create isa device %s with no isa bus present.",
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name);
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}
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dev = qdev_try_create(&isabus->qbus, name);
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return DO_UPCAST(ISADevice, qdev, dev);
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}
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ISADevice *isa_create_simple(const char *name)
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{
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ISADevice *dev;
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dev = isa_create(name);
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qdev_init_nofail(&dev->qdev);
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return dev;
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}
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static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
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{
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ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
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if (d->isairq[1] != -1) {
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monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
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d->isairq[0], d->isairq[1]);
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} else if (d->isairq[0] != -1) {
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monitor_printf(mon, "%*sisa irq %d\n", indent, "",
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d->isairq[0]);
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}
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}
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static int isabus_bridge_init(SysBusDevice *dev)
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{
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/* nothing */
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return 0;
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}
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static SysBusDeviceInfo isabus_bridge_info = {
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.init = isabus_bridge_init,
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.qdev.name = "isabus-bridge",
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.qdev.fw_name = "isa",
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.qdev.size = sizeof(SysBusDevice),
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.qdev.no_user = 1,
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};
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static void isabus_register_devices(void)
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{
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sysbus_register_withprop(&isabus_bridge_info);
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}
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static char *isabus_get_fw_dev_path(DeviceState *dev)
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{
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ISADevice *d = (ISADevice*)dev;
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char path[40];
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int off;
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off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
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if (d->nioports) {
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snprintf(path + off, sizeof(path) - off, "@%04x", d->ioports[0]);
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}
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return strdup(path);
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}
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device_init(isabus_register_devices)
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