hw/isa-bus.c

   1 /*
   2  * isa bus support for qdev.
   3  *
   4  * Copyright (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "hw.h"
  20 #include "sysemu.h"
  21 #include "monitor.h"
  22 #include "sysbus.h"
  23 #include "isa.h"
  24
  25 struct ISABus {
  26     BusState qbus;
  27     qemu_irq *irqs;
  28     uint32_t assigned;
  29 };
  30 static ISABus *isabus;
  31 target_phys_addr_t isa_mem_base = 0;
  32
  33 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  34 static char *isabus_get_fw_dev_path(DeviceState *dev);
  35
  36 static struct BusInfo isa_bus_info = {
  37     .name      = "ISA",
  38     .size      = sizeof(ISABus),
  39     .print_dev = isabus_dev_print,
  40     .get_fw_dev_path = isabus_get_fw_dev_path,
  41 };
  42
  43 ISABus *isa_bus_new(DeviceState *dev)
  44 {
  45     if (isabus) {
  46         fprintf(stderr, "Can't create a second ISA bus\n");
  47         return NULL;
  48     }
  49     if (NULL == dev) {
  50         dev = qdev_create(NULL, "isabus-bridge");
  51         qdev_init_nofail(dev);
  52     }
  53
  54     isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
  55     return isabus;
  56 }
  57
  58 void isa_bus_irqs(qemu_irq *irqs)
  59 {
  60     isabus->irqs = irqs;
  61 }
  62
  63 /*
  64  * isa_reserve_irq() reserves the ISA irq and returns the corresponding
  65  * qemu_irq entry for the i8259.
  66  *
  67  * This function is only for special cases such as the 'ferr', and
  68  * temporary use for normal devices until they are converted to qdev.
  69  */
  70 qemu_irq isa_reserve_irq(int isairq)
  71 {
  72     if (isairq < 0 || isairq > 15) {
  73         hw_error("isa irq %d invalid", isairq);
  74     }
  75     if (isabus->assigned & (1 << isairq)) {
  76         hw_error("isa irq %d already assigned", isairq);
  77     }
  78     isabus->assigned |= (1 << isairq);
  79     return isabus->irqs[isairq];
  80 }
  81
  82 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq)
  83 {
  84     assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
  85     if (isabus->assigned & (1 << isairq)) {
  86         hw_error("isa irq %d already assigned", isairq);
  87     }
  88     isabus->assigned |= (1 << isairq);
  89     dev->isairq[dev->nirqs] = isairq;
  90     *p = isabus->irqs[isairq];
  91     dev->nirqs++;
  92 }
  93
  94 static void isa_init_ioport_one(ISADevice *dev, uint16_t ioport)
  95 {
  96     assert(dev->nioports < ARRAY_SIZE(dev->ioports));
  97     dev->ioports[dev->nioports++] = ioport;
  98 }
  99
 100 static int isa_cmp_ports(const void *p1, const void *p2)
 101 {
 102     return *(uint16_t*)p1 - *(uint16_t*)p2;
 103 }
 104
 105 void isa_init_ioport_range(ISADevice *dev, uint16_t start, uint16_t length)
 106 {
 107     int i;
 108     for (i = start; i < start + length; i++) {
 109         isa_init_ioport_one(dev, i);
 110     }
 111     qsort(dev->ioports, dev->nioports, sizeof(dev->ioports[0]), isa_cmp_ports);
 112 }
 113
 114 void isa_init_ioport(ISADevice *dev, uint16_t ioport)
 115 {
 116     isa_init_ioport_range(dev, ioport, 1);
 117 }
 118
 119 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 120 {
 121     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
 122     ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
 123
 124     dev->isairq[0] = -1;
 125     dev->isairq[1] = -1;
 126
 127     return info->init(dev);
 128 }
 129
 130 void isa_qdev_register(ISADeviceInfo *info)
 131 {
 132     info->qdev.init = isa_qdev_init;
 133     info->qdev.bus_info = &isa_bus_info;
 134     qdev_register(&info->qdev);
 135 }
 136
 137 ISADevice *isa_create(const char *name)
 138 {
 139     DeviceState *dev;
 140
 141     if (!isabus) {
 142         hw_error("Tried to create isa device %s with no isa bus present.",
 143                  name);
 144     }
 145     dev = qdev_create(&isabus->qbus, name);
 146     return DO_UPCAST(ISADevice, qdev, dev);
 147 }
 148
 149 ISADevice *isa_try_create(const char *name)
 150 {
 151     DeviceState *dev;
 152
 153     if (!isabus) {
 154         hw_error("Tried to create isa device %s with no isa bus present.",
 155                  name);
 156     }
 157     dev = qdev_try_create(&isabus->qbus, name);
 158     return DO_UPCAST(ISADevice, qdev, dev);
 159 }
 160
 161 ISADevice *isa_create_simple(const char *name)
 162 {
 163     ISADevice *dev;
 164
 165     dev = isa_create(name);
 166     qdev_init_nofail(&dev->qdev);
 167     return dev;
 168 }
 169
 170 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 171 {
 172     ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
 173
 174     if (d->isairq[1] != -1) {
 175         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 176                        d->isairq[0], d->isairq[1]);
 177     } else if (d->isairq[0] != -1) {
 178         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 179                        d->isairq[0]);
 180     }
 181 }
 182
 183 static int isabus_bridge_init(SysBusDevice *dev)
 184 {
 185     /* nothing */
 186     return 0;
 187 }
 188
 189 static SysBusDeviceInfo isabus_bridge_info = {
 190     .init = isabus_bridge_init,
 191     .qdev.name  = "isabus-bridge",
 192     .qdev.fw_name  = "isa",
 193     .qdev.size  = sizeof(SysBusDevice),
 194     .qdev.no_user = 1,
 195 };
 196
 197 static void isabus_register_devices(void)
 198 {
 199     sysbus_register_withprop(&isabus_bridge_info);
 200 }
 201
 202 static char *isabus_get_fw_dev_path(DeviceState *dev)
 203 {
 204     ISADevice *d = (ISADevice*)dev;
 205     char path[40];
 206     int off;
 207
 208     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 209     if (d->nioports) {
 210         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioports[0]);
 211     }
 212
 213     return strdup(path);
 214 }
 215
 216 device_init(isabus_register_devices)