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 "qemu/osdep.h"
  21 #include "qapi/error.h"
  22 #include "hw/sysbus.h"
  23 #include "monitor/monitor.h"
  24 #include "exec/address-spaces.h"
  25
  26 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  27 static char *sysbus_get_fw_dev_path(DeviceState *dev);
  28
  29 typedef struct SysBusFind {
  30     void *opaque;
  31     FindSysbusDeviceFunc *func;
  32 } SysBusFind;
  33
  34 /* Run func() for every sysbus device, traverse the tree for everything else */
  35 static int find_sysbus_device(Object *obj, void *opaque)
  36 {
  37     SysBusFind *find = opaque;
  38     Object *dev;
  39     SysBusDevice *sbdev;
  40
  41     dev = object_dynamic_cast(obj, TYPE_SYS_BUS_DEVICE);
  42     sbdev = (SysBusDevice *)dev;
  43
  44     if (!sbdev) {
  45         /* Container, traverse it for children */
  46         return object_child_foreach(obj, find_sysbus_device, opaque);
  47     }
  48
  49     find->func(sbdev, find->opaque);
  50
  51     return 0;
  52 }
  53
  54 /*
  55  * Loop through all dynamically created sysbus devices and call
  56  * func() for each instance.
  57  */
  58 void foreach_dynamic_sysbus_device(FindSysbusDeviceFunc *func, void *opaque)
  59 {
  60     Object *container;
  61     SysBusFind find = {
  62         .func = func,
  63         .opaque = opaque,
  64     };
  65
  66     /* Loop through all sysbus devices that were spawened outside the machine */
  67     container = container_get(qdev_get_machine(), "/peripheral");
  68     find_sysbus_device(container, &find);
  69     container = container_get(qdev_get_machine(), "/peripheral-anon");
  70     find_sysbus_device(container, &find);
  71 }
  72
  73
  74 static void system_bus_class_init(ObjectClass *klass, void *data)
  75 {
  76     BusClass *k = BUS_CLASS(klass);
  77
  78     k->print_dev = sysbus_dev_print;
  79     k->get_fw_dev_path = sysbus_get_fw_dev_path;
  80 }
  81
  82 static const TypeInfo system_bus_info = {
  83     .name = TYPE_SYSTEM_BUS,
  84     .parent = TYPE_BUS,
  85     .instance_size = sizeof(BusState),
  86     .class_init = system_bus_class_init,
  87 };
  88
  89 /* Check whether an IRQ source exists */
  90 bool sysbus_has_irq(SysBusDevice *dev, int n)
  91 {
  92     char *prop = g_strdup_printf("%s[%d]", SYSBUS_DEVICE_GPIO_IRQ, n);
  93     ObjectProperty *r;
  94
  95     r = object_property_find(OBJECT(dev), prop, NULL);
  96     g_free(prop);
  97
  98     return (r != NULL);
  99 }
 100
 101 bool sysbus_is_irq_connected(SysBusDevice *dev, int n)
 102 {
 103     return !!sysbus_get_connected_irq(dev, n);
 104 }
 105
 106 qemu_irq sysbus_get_connected_irq(SysBusDevice *dev, int n)
 107 {
 108     DeviceState *d = DEVICE(dev);
 109     return qdev_get_gpio_out_connector(d, SYSBUS_DEVICE_GPIO_IRQ, n);
 110 }
 111
 112 void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
 113 {
 114     SysBusDeviceClass *sbd = SYS_BUS_DEVICE_GET_CLASS(dev);
 115
 116     qdev_connect_gpio_out_named(DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ, n, irq);
 117
 118     if (sbd->connect_irq_notifier) {
 119         sbd->connect_irq_notifier(dev, irq);
 120     }
 121 }
 122
 123 /* Check whether an MMIO region exists */
 124 bool sysbus_has_mmio(SysBusDevice *dev, unsigned int n)
 125 {
 126     return (n < dev->num_mmio);
 127 }
 128
 129 static void sysbus_mmio_map_common(SysBusDevice *dev, int n, hwaddr addr,
 130                                    bool may_overlap, int priority)
 131 {
 132     assert(n >= 0 && n < dev->num_mmio);
 133
 134     if (dev->mmio[n].addr == addr) {
 135         /* ??? region already mapped here.  */
 136         return;
 137     }
 138     if (dev->mmio[n].addr != (hwaddr)-1) {
 139         /* Unregister previous mapping.  */
 140         memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
 141     }
 142     dev->mmio[n].addr = addr;
 143     if (may_overlap) {
 144         memory_region_add_subregion_overlap(get_system_memory(),
 145                                             addr,
 146                                             dev->mmio[n].memory,
 147                                             priority);
 148     }
 149     else {
 150         memory_region_add_subregion(get_system_memory(),
 151                                     addr,
 152                                     dev->mmio[n].memory);
 153     }
 154 }
 155
 156 void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
 157 {
 158     sysbus_mmio_map_common(dev, n, addr, false, 0);
 159 }
 160
 161 void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
 162                              int priority)
 163 {
 164     sysbus_mmio_map_common(dev, n, addr, true, priority);
 165 }
 166
 167 /* Request an IRQ source.  The actual IRQ object may be populated later.  */
 168 void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
 169 {
 170     qdev_init_gpio_out_named(DEVICE(dev), p, SYSBUS_DEVICE_GPIO_IRQ, 1);
 171 }
 172
 173 /* Pass IRQs from a target device.  */
 174 void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)
 175 {
 176     qdev_pass_gpios(DEVICE(target), DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ);
 177 }
 178
 179 void sysbus_init_mmio(SysBusDevice *dev, MemoryRegion *memory)
 180 {
 181     int n;
 182
 183     assert(dev->num_mmio < QDEV_MAX_MMIO);
 184     n = dev->num_mmio++;
 185     dev->mmio[n].addr = -1;
 186     dev->mmio[n].memory = memory;
 187 }
 188
 189 MemoryRegion *sysbus_mmio_get_region(SysBusDevice *dev, int n)
 190 {
 191     return dev->mmio[n].memory;
 192 }
 193
 194 void sysbus_init_ioports(SysBusDevice *dev, uint32_t ioport, uint32_t size)
 195 {
 196     uint32_t i;
 197
 198     for (i = 0; i < size; i++) {
 199         assert(dev->num_pio < QDEV_MAX_PIO);
 200         dev->pio[dev->num_pio++] = ioport++;
 201     }
 202 }
 203
 204 /* The purpose of preserving this empty realize function
 205  * is to prevent the parent_realize field of some subclasses
 206  * from being set to NULL to break the normal init/realize
 207  * of some devices.
 208  */
 209 static void sysbus_realize(DeviceState *dev, Error **errp)
 210 {
 211 }
 212
 213 DeviceState *sysbus_create_varargs(const char *name,
 214                                    hwaddr addr, ...)
 215 {
 216     DeviceState *dev;
 217     SysBusDevice *s;
 218     va_list va;
 219     qemu_irq irq;
 220     int n;
 221
 222     dev = qdev_create(NULL, name);
 223     s = SYS_BUS_DEVICE(dev);
 224     qdev_init_nofail(dev);
 225     if (addr != (hwaddr)-1) {
 226         sysbus_mmio_map(s, 0, addr);
 227     }
 228     va_start(va, addr);
 229     n = 0;
 230     while (1) {
 231         irq = va_arg(va, qemu_irq);
 232         if (!irq) {
 233             break;
 234         }
 235         sysbus_connect_irq(s, n, irq);
 236         n++;
 237     }
 238     va_end(va);
 239     return dev;
 240 }
 241
 242 DeviceState *sysbus_try_create_varargs(const char *name,
 243                                        hwaddr addr, ...)
 244 {
 245     DeviceState *dev;
 246     SysBusDevice *s;
 247     va_list va;
 248     qemu_irq irq;
 249     int n;
 250
 251     dev = qdev_try_create(NULL, name);
 252     if (!dev) {
 253         return NULL;
 254     }
 255     s = SYS_BUS_DEVICE(dev);
 256     qdev_init_nofail(dev);
 257     if (addr != (hwaddr)-1) {
 258         sysbus_mmio_map(s, 0, addr);
 259     }
 260     va_start(va, addr);
 261     n = 0;
 262     while (1) {
 263         irq = va_arg(va, qemu_irq);
 264         if (!irq) {
 265             break;
 266         }
 267         sysbus_connect_irq(s, n, irq);
 268         n++;
 269     }
 270     va_end(va);
 271     return dev;
 272 }
 273
 274 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 275 {
 276     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 277     hwaddr size;
 278     int i;
 279
 280     for (i = 0; i < s->num_mmio; i++) {
 281         size = memory_region_size(s->mmio[i].memory);
 282         monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
 283                        indent, "", s->mmio[i].addr, size);
 284     }
 285 }
 286
 287 static char *sysbus_get_fw_dev_path(DeviceState *dev)
 288 {
 289     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 290     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(s);
 291     char *addr, *fw_dev_path;
 292
 293     if (sbc->explicit_ofw_unit_address) {
 294         addr = sbc->explicit_ofw_unit_address(s);
 295         if (addr) {
 296             fw_dev_path = g_strdup_printf("%s@%s", qdev_fw_name(dev), addr);
 297             g_free(addr);
 298             return fw_dev_path;
 299         }
 300     }
 301     if (s->num_mmio) {
 302         return g_strdup_printf("%s@" TARGET_FMT_plx, qdev_fw_name(dev),
 303                                s->mmio[0].addr);
 304     }
 305     if (s->num_pio) {
 306         return g_strdup_printf("%s@i%04x", qdev_fw_name(dev), s->pio[0]);
 307     }
 308     return g_strdup(qdev_fw_name(dev));
 309 }
 310
 311 void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
 312                        MemoryRegion *mem)
 313 {
 314     memory_region_add_subregion(get_system_io(), addr, mem);
 315 }
 316
 317 MemoryRegion *sysbus_address_space(SysBusDevice *dev)
 318 {
 319     return get_system_memory();
 320 }
 321
 322 static void sysbus_device_class_init(ObjectClass *klass, void *data)
 323 {
 324     DeviceClass *k = DEVICE_CLASS(klass);
 325     k->realize = sysbus_realize;
 326     k->bus_type = TYPE_SYSTEM_BUS;
 327     /*
 328      * device_add plugs devices into a suitable bus.  For "real" buses,
 329      * that actually connects the device.  For sysbus, the connections
 330      * need to be made separately, and device_add can't do that.  The
 331      * device would be left unconnected, and will probably not work
 332      *
 333      * However, a few machines can handle device_add/-device with
 334      * a few specific sysbus devices. In those cases, the device
 335      * subclass needs to override it and set user_creatable=true.
 336      */
 337     k->user_creatable = false;
 338 }
 339
 340 static const TypeInfo sysbus_device_type_info = {
 341     .name = TYPE_SYS_BUS_DEVICE,
 342     .parent = TYPE_DEVICE,
 343     .instance_size = sizeof(SysBusDevice),
 344     .abstract = true,
 345     .class_size = sizeof(SysBusDeviceClass),
 346     .class_init = sysbus_device_class_init,
 347 };
 348
 349 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 350 static BusState *main_system_bus;
 351
 352 static void main_system_bus_create(void)
 353 {
 354     /* assign main_system_bus before qbus_create_inplace()
 355      * in order to make "if (bus != sysbus_get_default())" work */
 356     main_system_bus = g_malloc0(system_bus_info.instance_size);
 357     qbus_create_inplace(main_system_bus, system_bus_info.instance_size,
 358                         TYPE_SYSTEM_BUS, NULL, "main-system-bus");
 359     OBJECT(main_system_bus)->free = g_free;
 360 }
 361
 362 BusState *sysbus_get_default(void)
 363 {
 364     if (!main_system_bus) {
 365         main_system_bus_create();
 366     }
 367     return main_system_bus;
 368 }
 369
 370 void sysbus_init_child_obj(Object *parent, const char *childname, void *child,
 371                            size_t childsize, const char *childtype)
 372 {
 373     object_initialize_child(parent, childname, child, childsize, childtype,
 374                             &error_abort, NULL);
 375     qdev_set_parent_bus(DEVICE(child), sysbus_get_default());
 376 }
 377
 378 static void sysbus_register_types(void)
 379 {
 380     type_register_static(&system_bus_info);
 381     type_register_static(&sysbus_device_type_info);
 382 }
 383
 384 type_init(sysbus_register_types)