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