hw/core/sysbus.c

   1 /*
   2  *  System (CPU) Bus device support code
   3  *
   4  *  Copyright (c) 2009 CodeSourcery
   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
  20 #include "hw/sysbus.h"
  21 #include "monitor/monitor.h"
  22 #include "exec/address-spaces.h"
  23
  24 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  25 static char *sysbus_get_fw_dev_path(DeviceState *dev);
  26
  27 static void system_bus_class_init(ObjectClass *klass, void *data)
  28 {
  29     BusClass *k = BUS_CLASS(klass);
  30
  31     k->print_dev = sysbus_dev_print;
  32     k->get_fw_dev_path = sysbus_get_fw_dev_path;
  33 }
  34
  35 static const TypeInfo system_bus_info = {
  36     .name = TYPE_SYSTEM_BUS,
  37     .parent = TYPE_BUS,
  38     .instance_size = sizeof(BusState),
  39     .class_init = system_bus_class_init,
  40 };
  41
  42 void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
  43 {
  44     assert(n >= 0 && n < dev->num_irq);
  45     dev->irqs[n] = NULL;
  46     if (dev->irqp[n]) {
  47         *dev->irqp[n] = irq;
  48     }
  49 }
  50
  51 static void sysbus_mmio_map_common(SysBusDevice *dev, int n, hwaddr addr,
  52                                    bool may_overlap, int priority)
  53 {
  54     assert(n >= 0 && n < dev->num_mmio);
  55
  56     if (dev->mmio[n].addr == addr) {
  57         /* ??? region already mapped here.  */
  58         return;
  59     }
  60     if (dev->mmio[n].addr != (hwaddr)-1) {
  61         /* Unregister previous mapping.  */
  62         memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
  63     }
  64     dev->mmio[n].addr = addr;
  65     if (may_overlap) {
  66         memory_region_add_subregion_overlap(get_system_memory(),
  67                                             addr,
  68                                             dev->mmio[n].memory,
  69                                             priority);
  70     }
  71     else {
  72         memory_region_add_subregion(get_system_memory(),
  73                                     addr,
  74                                     dev->mmio[n].memory);
  75     }
  76 }
  77
  78 void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
  79 {
  80     sysbus_mmio_map_common(dev, n, addr, false, 0);
  81 }
  82
  83 void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
  84                              int priority)
  85 {
  86     sysbus_mmio_map_common(dev, n, addr, true, priority);
  87 }
  88
  89 /* Request an IRQ source.  The actual IRQ object may be populated later.  */
  90 void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
  91 {
  92     int n;
  93
  94     assert(dev->num_irq < QDEV_MAX_IRQ);
  95     n = dev->num_irq++;
  96     dev->irqp[n] = p;
  97 }
  98
  99 /* Pass IRQs from a target device.  */
 100 void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)
 101 {
 102     int i;
 103     assert(dev->num_irq == 0);
 104     dev->num_irq = target->num_irq;
 105     for (i = 0; i < dev->num_irq; i++) {
 106         dev->irqp[i] = target->irqp[i];
 107     }
 108 }
 109
 110 void sysbus_init_mmio(SysBusDevice *dev, MemoryRegion *memory)
 111 {
 112     int n;
 113
 114     assert(dev->num_mmio < QDEV_MAX_MMIO);
 115     n = dev->num_mmio++;
 116     dev->mmio[n].addr = -1;
 117     dev->mmio[n].memory = memory;
 118 }
 119
 120 MemoryRegion *sysbus_mmio_get_region(SysBusDevice *dev, int n)
 121 {
 122     return dev->mmio[n].memory;
 123 }
 124
 125 void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size)
 126 {
 127     pio_addr_t i;
 128
 129     for (i = 0; i < size; i++) {
 130         assert(dev->num_pio < QDEV_MAX_PIO);
 131         dev->pio[dev->num_pio++] = ioport++;
 132     }
 133 }
 134
 135 static int sysbus_device_init(DeviceState *dev)
 136 {
 137     SysBusDevice *sd = SYS_BUS_DEVICE(dev);
 138     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(sd);
 139
 140     if (!sbc->init) {
 141         return 0;
 142     }
 143     return sbc->init(sd);
 144 }
 145
 146 DeviceState *sysbus_create_varargs(const char *name,
 147                                    hwaddr addr, ...)
 148 {
 149     DeviceState *dev;
 150     SysBusDevice *s;
 151     va_list va;
 152     qemu_irq irq;
 153     int n;
 154
 155     dev = qdev_create(NULL, name);
 156     s = SYS_BUS_DEVICE(dev);
 157     qdev_init_nofail(dev);
 158     if (addr != (hwaddr)-1) {
 159         sysbus_mmio_map(s, 0, addr);
 160     }
 161     va_start(va, addr);
 162     n = 0;
 163     while (1) {
 164         irq = va_arg(va, qemu_irq);
 165         if (!irq) {
 166             break;
 167         }
 168         sysbus_connect_irq(s, n, irq);
 169         n++;
 170     }
 171     va_end(va);
 172     return dev;
 173 }
 174
 175 DeviceState *sysbus_try_create_varargs(const char *name,
 176                                        hwaddr addr, ...)
 177 {
 178     DeviceState *dev;
 179     SysBusDevice *s;
 180     va_list va;
 181     qemu_irq irq;
 182     int n;
 183
 184     dev = qdev_try_create(NULL, name);
 185     if (!dev) {
 186         return NULL;
 187     }
 188     s = SYS_BUS_DEVICE(dev);
 189     qdev_init_nofail(dev);
 190     if (addr != (hwaddr)-1) {
 191         sysbus_mmio_map(s, 0, addr);
 192     }
 193     va_start(va, addr);
 194     n = 0;
 195     while (1) {
 196         irq = va_arg(va, qemu_irq);
 197         if (!irq) {
 198             break;
 199         }
 200         sysbus_connect_irq(s, n, irq);
 201         n++;
 202     }
 203     va_end(va);
 204     return dev;
 205 }
 206
 207 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 208 {
 209     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 210     hwaddr size;
 211     int i;
 212
 213     monitor_printf(mon, "%*sirq %d\n", indent, "", s->num_irq);
 214     for (i = 0; i < s->num_mmio; i++) {
 215         size = memory_region_size(s->mmio[i].memory);
 216         monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
 217                        indent, "", s->mmio[i].addr, size);
 218     }
 219 }
 220
 221 static char *sysbus_get_fw_dev_path(DeviceState *dev)
 222 {
 223     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 224     char path[40];
 225     int off;
 226
 227     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 228
 229     if (s->num_mmio) {
 230         snprintf(path + off, sizeof(path) - off, "@"TARGET_FMT_plx,
 231                  s->mmio[0].addr);
 232     } else if (s->num_pio) {
 233         snprintf(path + off, sizeof(path) - off, "@i%04x", s->pio[0]);
 234     }
 235
 236     return g_strdup(path);
 237 }
 238
 239 void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
 240                        MemoryRegion *mem)
 241 {
 242     memory_region_add_subregion(get_system_io(), addr, mem);
 243 }
 244
 245 void sysbus_del_io(SysBusDevice *dev, MemoryRegion *mem)
 246 {
 247     memory_region_del_subregion(get_system_io(), mem);
 248 }
 249
 250 MemoryRegion *sysbus_address_space(SysBusDevice *dev)
 251 {
 252     return get_system_memory();
 253 }
 254
 255 static void sysbus_device_class_init(ObjectClass *klass, void *data)
 256 {
 257     DeviceClass *k = DEVICE_CLASS(klass);
 258     k->init = sysbus_device_init;
 259     k->bus_type = TYPE_SYSTEM_BUS;
 260     /*
 261      * device_add plugs devices into suitable bus.  For "real" buses,
 262      * that actually connects the device.  For sysbus, the connections
 263      * need to be made separately, and device_add can't do that.  The
 264      * device would be left unconnected, and could not possibly work.
 265      */
 266     k->cannot_instantiate_with_device_add_yet = true;
 267 }
 268
 269 static const TypeInfo sysbus_device_type_info = {
 270     .name = TYPE_SYS_BUS_DEVICE,
 271     .parent = TYPE_DEVICE,
 272     .instance_size = sizeof(SysBusDevice),
 273     .abstract = true,
 274     .class_size = sizeof(SysBusDeviceClass),
 275     .class_init = sysbus_device_class_init,
 276 };
 277
 278 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 279 static BusState *main_system_bus;
 280
 281 static void main_system_bus_create(void)
 282 {
 283     /* assign main_system_bus before qbus_create_inplace()
 284      * in order to make "if (bus != sysbus_get_default())" work */
 285     main_system_bus = g_malloc0(system_bus_info.instance_size);
 286     qbus_create_inplace(main_system_bus, system_bus_info.instance_size,
 287                         TYPE_SYSTEM_BUS, NULL, "main-system-bus");
 288     OBJECT(main_system_bus)->free = g_free;
 289     object_property_add_child(container_get(qdev_get_machine(),
 290                                             "/unattached"),
 291                               "sysbus", OBJECT(main_system_bus), NULL);
 292 }
 293
 294 BusState *sysbus_get_default(void)
 295 {
 296     if (!main_system_bus) {
 297         main_system_bus_create();
 298     }
 299     return main_system_bus;
 300 }
 301
 302 static void sysbus_register_types(void)
 303 {
 304     type_register_static(&system_bus_info);
 305     type_register_static(&sysbus_device_type_info);
 306 }
 307
 308 type_init(sysbus_register_types)