hw/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, unsigned 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                              unsigned 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     return sbc->init(sd);
 141 }
 142
 143 DeviceState *sysbus_create_varargs(const char *name,
 144                                    hwaddr addr, ...)
 145 {
 146     DeviceState *dev;
 147     SysBusDevice *s;
 148     va_list va;
 149     qemu_irq irq;
 150     int n;
 151
 152     dev = qdev_create(NULL, name);
 153     s = SYS_BUS_DEVICE(dev);
 154     qdev_init_nofail(dev);
 155     if (addr != (hwaddr)-1) {
 156         sysbus_mmio_map(s, 0, addr);
 157     }
 158     va_start(va, addr);
 159     n = 0;
 160     while (1) {
 161         irq = va_arg(va, qemu_irq);
 162         if (!irq) {
 163             break;
 164         }
 165         sysbus_connect_irq(s, n, irq);
 166         n++;
 167     }
 168     va_end(va);
 169     return dev;
 170 }
 171
 172 DeviceState *sysbus_try_create_varargs(const char *name,
 173                                        hwaddr addr, ...)
 174 {
 175     DeviceState *dev;
 176     SysBusDevice *s;
 177     va_list va;
 178     qemu_irq irq;
 179     int n;
 180
 181     dev = qdev_try_create(NULL, name);
 182     if (!dev) {
 183         return NULL;
 184     }
 185     s = SYS_BUS_DEVICE(dev);
 186     qdev_init_nofail(dev);
 187     if (addr != (hwaddr)-1) {
 188         sysbus_mmio_map(s, 0, addr);
 189     }
 190     va_start(va, addr);
 191     n = 0;
 192     while (1) {
 193         irq = va_arg(va, qemu_irq);
 194         if (!irq) {
 195             break;
 196         }
 197         sysbus_connect_irq(s, n, irq);
 198         n++;
 199     }
 200     va_end(va);
 201     return dev;
 202 }
 203
 204 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 205 {
 206     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 207     hwaddr size;
 208     int i;
 209
 210     monitor_printf(mon, "%*sirq %d\n", indent, "", s->num_irq);
 211     for (i = 0; i < s->num_mmio; i++) {
 212         size = memory_region_size(s->mmio[i].memory);
 213         monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
 214                        indent, "", s->mmio[i].addr, size);
 215     }
 216 }
 217
 218 static char *sysbus_get_fw_dev_path(DeviceState *dev)
 219 {
 220     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 221     char path[40];
 222     int off;
 223
 224     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 225
 226     if (s->num_mmio) {
 227         snprintf(path + off, sizeof(path) - off, "@"TARGET_FMT_plx,
 228                  s->mmio[0].addr);
 229     } else if (s->num_pio) {
 230         snprintf(path + off, sizeof(path) - off, "@i%04x", s->pio[0]);
 231     }
 232
 233     return g_strdup(path);
 234 }
 235
 236 void sysbus_add_memory(SysBusDevice *dev, hwaddr addr,
 237                        MemoryRegion *mem)
 238 {
 239     memory_region_add_subregion(get_system_memory(), addr, mem);
 240 }
 241
 242 void sysbus_add_memory_overlap(SysBusDevice *dev, hwaddr addr,
 243                                MemoryRegion *mem, unsigned priority)
 244 {
 245     memory_region_add_subregion_overlap(get_system_memory(), addr, mem,
 246                                         priority);
 247 }
 248
 249 void sysbus_del_memory(SysBusDevice *dev, MemoryRegion *mem)
 250 {
 251     memory_region_del_subregion(get_system_memory(), mem);
 252 }
 253
 254 void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
 255                        MemoryRegion *mem)
 256 {
 257     memory_region_add_subregion(get_system_io(), addr, mem);
 258 }
 259
 260 void sysbus_del_io(SysBusDevice *dev, MemoryRegion *mem)
 261 {
 262     memory_region_del_subregion(get_system_io(), mem);
 263 }
 264
 265 MemoryRegion *sysbus_address_space(SysBusDevice *dev)
 266 {
 267     return get_system_memory();
 268 }
 269
 270 static void sysbus_device_class_init(ObjectClass *klass, void *data)
 271 {
 272     DeviceClass *k = DEVICE_CLASS(klass);
 273     k->init = sysbus_device_init;
 274     k->bus_type = TYPE_SYSTEM_BUS;
 275 }
 276
 277 static const TypeInfo sysbus_device_type_info = {
 278     .name = TYPE_SYS_BUS_DEVICE,
 279     .parent = TYPE_DEVICE,
 280     .instance_size = sizeof(SysBusDevice),
 281     .abstract = true,
 282     .class_size = sizeof(SysBusDeviceClass),
 283     .class_init = sysbus_device_class_init,
 284 };
 285
 286 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 287 static BusState *main_system_bus;
 288
 289 static void main_system_bus_create(void)
 290 {
 291     /* assign main_system_bus before qbus_create_inplace()
 292      * in order to make "if (bus != sysbus_get_default())" work */
 293     main_system_bus = g_malloc0(system_bus_info.instance_size);
 294     qbus_create_inplace(main_system_bus, TYPE_SYSTEM_BUS, NULL,
 295                         "main-system-bus");
 296     OBJECT(main_system_bus)->free = g_free;
 297     object_property_add_child(container_get(qdev_get_machine(),
 298                                             "/unattached"),
 299                               "sysbus", OBJECT(main_system_bus), NULL);
 300 }
 301
 302 BusState *sysbus_get_default(void)
 303 {
 304     if (!main_system_bus) {
 305         main_system_bus_create();
 306     }
 307     return main_system_bus;
 308 }
 309
 310 static void sysbus_register_types(void)
 311 {
 312     type_register_static(&system_bus_info);
 313     type_register_static(&sysbus_device_type_info);
 314 }
 315
 316 type_init(sysbus_register_types)