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 /* TODO remove once all sysbus devices have been converted to realize */
 205 static void sysbus_realize(DeviceState *dev, Error **errp)
 206 {
 207     SysBusDevice *sd = SYS_BUS_DEVICE(dev);
 208     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(sd);
 209
 210     if (!sbc->init) {
 211         return;
 212     }
 213     if (sbc->init(sd) < 0) {
 214         error_setg(errp, "Device initialization failed");
 215     }
 216 }
 217
 218 DeviceState *sysbus_create_varargs(const char *name,
 219                                    hwaddr addr, ...)
 220 {
 221     DeviceState *dev;
 222     SysBusDevice *s;
 223     va_list va;
 224     qemu_irq irq;
 225     int n;
 226
 227     dev = qdev_create(NULL, name);
 228     s = SYS_BUS_DEVICE(dev);
 229     qdev_init_nofail(dev);
 230     if (addr != (hwaddr)-1) {
 231         sysbus_mmio_map(s, 0, addr);
 232     }
 233     va_start(va, addr);
 234     n = 0;
 235     while (1) {
 236         irq = va_arg(va, qemu_irq);
 237         if (!irq) {
 238             break;
 239         }
 240         sysbus_connect_irq(s, n, irq);
 241         n++;
 242     }
 243     va_end(va);
 244     return dev;
 245 }
 246
 247 DeviceState *sysbus_try_create_varargs(const char *name,
 248                                        hwaddr addr, ...)
 249 {
 250     DeviceState *dev;
 251     SysBusDevice *s;
 252     va_list va;
 253     qemu_irq irq;
 254     int n;
 255
 256     dev = qdev_try_create(NULL, name);
 257     if (!dev) {
 258         return NULL;
 259     }
 260     s = SYS_BUS_DEVICE(dev);
 261     qdev_init_nofail(dev);
 262     if (addr != (hwaddr)-1) {
 263         sysbus_mmio_map(s, 0, addr);
 264     }
 265     va_start(va, addr);
 266     n = 0;
 267     while (1) {
 268         irq = va_arg(va, qemu_irq);
 269         if (!irq) {
 270             break;
 271         }
 272         sysbus_connect_irq(s, n, irq);
 273         n++;
 274     }
 275     va_end(va);
 276     return dev;
 277 }
 278
 279 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 280 {
 281     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 282     hwaddr size;
 283     int i;
 284
 285     for (i = 0; i < s->num_mmio; i++) {
 286         size = memory_region_size(s->mmio[i].memory);
 287         monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
 288                        indent, "", s->mmio[i].addr, size);
 289     }
 290 }
 291
 292 static char *sysbus_get_fw_dev_path(DeviceState *dev)
 293 {
 294     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 295     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(s);
 296     char *addr, *fw_dev_path;
 297
 298     if (sbc->explicit_ofw_unit_address) {
 299         addr = sbc->explicit_ofw_unit_address(s);
 300         if (addr) {
 301             fw_dev_path = g_strdup_printf("%s@%s", qdev_fw_name(dev), addr);
 302             g_free(addr);
 303             return fw_dev_path;
 304         }
 305     }
 306     if (s->num_mmio) {
 307         return g_strdup_printf("%s@" TARGET_FMT_plx, qdev_fw_name(dev),
 308                                s->mmio[0].addr);
 309     }
 310     if (s->num_pio) {
 311         return g_strdup_printf("%s@i%04x", qdev_fw_name(dev), s->pio[0]);
 312     }
 313     return g_strdup(qdev_fw_name(dev));
 314 }
 315
 316 void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
 317                        MemoryRegion *mem)
 318 {
 319     memory_region_add_subregion(get_system_io(), addr, mem);
 320 }
 321
 322 MemoryRegion *sysbus_address_space(SysBusDevice *dev)
 323 {
 324     return get_system_memory();
 325 }
 326
 327 static void sysbus_device_class_init(ObjectClass *klass, void *data)
 328 {
 329     DeviceClass *k = DEVICE_CLASS(klass);
 330     k->realize = sysbus_realize;
 331     k->bus_type = TYPE_SYSTEM_BUS;
 332     /*
 333      * device_add plugs devices into a suitable bus.  For "real" buses,
 334      * that actually connects the device.  For sysbus, the connections
 335      * need to be made separately, and device_add can't do that.  The
 336      * device would be left unconnected, and will probably not work
 337      *
 338      * However, a few machines can handle device_add/-device with
 339      * a few specific sysbus devices. In those cases, the device
 340      * subclass needs to override it and set user_creatable=true.
 341      */
 342     k->user_creatable = false;
 343 }
 344
 345 static const TypeInfo sysbus_device_type_info = {
 346     .name = TYPE_SYS_BUS_DEVICE,
 347     .parent = TYPE_DEVICE,
 348     .instance_size = sizeof(SysBusDevice),
 349     .abstract = true,
 350     .class_size = sizeof(SysBusDeviceClass),
 351     .class_init = sysbus_device_class_init,
 352 };
 353
 354 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 355 static BusState *main_system_bus;
 356
 357 static void main_system_bus_create(void)
 358 {
 359     /* assign main_system_bus before qbus_create_inplace()
 360      * in order to make "if (bus != sysbus_get_default())" work */
 361     main_system_bus = g_malloc0(system_bus_info.instance_size);
 362     qbus_create_inplace(main_system_bus, system_bus_info.instance_size,
 363                         TYPE_SYSTEM_BUS, NULL, "main-system-bus");
 364     OBJECT(main_system_bus)->free = g_free;
 365     object_property_add_child(container_get(qdev_get_machine(),
 366                                             "/unattached"),
 367                               "sysbus", OBJECT(main_system_bus), NULL);
 368 }
 369
 370 BusState *sysbus_get_default(void)
 371 {
 372     if (!main_system_bus) {
 373         main_system_bus_create();
 374     }
 375     return main_system_bus;
 376 }
 377
 378 void sysbus_init_child_obj(Object *parent, const char *childname, void *child,
 379                            size_t childsize, const char *childtype)
 380 {
 381     object_initialize_child(parent, childname, child, childsize, childtype,
 382                             &error_abort, NULL);
 383     qdev_set_parent_bus(DEVICE(child), sysbus_get_default());
 384 }
 385
 386 static void sysbus_register_types(void)
 387 {
 388     type_register_static(&system_bus_info);
 389     type_register_static(&sysbus_device_type_info);
 390 }
 391
 392 type_init(sysbus_register_types)