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 typedef struct SysBusFind {
  28     void *opaque;
  29     FindSysbusDeviceFunc *func;
  30 } SysBusFind;
  31
  32 /* Run func() for every sysbus device, traverse the tree for everything else */
  33 static int find_sysbus_device(Object *obj, void *opaque)
  34 {
  35     SysBusFind *find = opaque;
  36     Object *dev;
  37     SysBusDevice *sbdev;
  38
  39     dev = object_dynamic_cast(obj, TYPE_SYS_BUS_DEVICE);
  40     sbdev = (SysBusDevice *)dev;
  41
  42     if (!sbdev) {
  43         /* Container, traverse it for children */
  44         return object_child_foreach(obj, find_sysbus_device, opaque);
  45     }
  46
  47     find->func(sbdev, find->opaque);
  48
  49     return 0;
  50 }
  51
  52 /*
  53  * Loop through all dynamically created sysbus devices and call
  54  * func() for each instance.
  55  */
  56 void foreach_dynamic_sysbus_device(FindSysbusDeviceFunc *func, void *opaque)
  57 {
  58     Object *container;
  59     SysBusFind find = {
  60         .func = func,
  61         .opaque = opaque,
  62     };
  63
  64     /* Loop through all sysbus devices that were spawened outside the machine */
  65     container = container_get(qdev_get_machine(), "/peripheral");
  66     find_sysbus_device(container, &find);
  67     container = container_get(qdev_get_machine(), "/peripheral-anon");
  68     find_sysbus_device(container, &find);
  69 }
  70
  71
  72 static void system_bus_class_init(ObjectClass *klass, void *data)
  73 {
  74     BusClass *k = BUS_CLASS(klass);
  75
  76     k->print_dev = sysbus_dev_print;
  77     k->get_fw_dev_path = sysbus_get_fw_dev_path;
  78 }
  79
  80 static const TypeInfo system_bus_info = {
  81     .name = TYPE_SYSTEM_BUS,
  82     .parent = TYPE_BUS,
  83     .instance_size = sizeof(BusState),
  84     .class_init = system_bus_class_init,
  85 };
  86
  87 /* Check whether an IRQ source exists */
  88 bool sysbus_has_irq(SysBusDevice *dev, int n)
  89 {
  90     char *prop = g_strdup_printf("%s[%d]", SYSBUS_DEVICE_GPIO_IRQ, n);
  91     ObjectProperty *r;
  92
  93     r = object_property_find(OBJECT(dev), prop, NULL);
  94     g_free(prop);
  95
  96     return (r != NULL);
  97 }
  98
  99 bool sysbus_is_irq_connected(SysBusDevice *dev, int n)
 100 {
 101     return !!sysbus_get_connected_irq(dev, n);
 102 }
 103
 104 qemu_irq sysbus_get_connected_irq(SysBusDevice *dev, int n)
 105 {
 106     DeviceState *d = DEVICE(dev);
 107     return qdev_get_gpio_out_connector(d, SYSBUS_DEVICE_GPIO_IRQ, n);
 108 }
 109
 110 void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
 111 {
 112     SysBusDeviceClass *sbd = SYS_BUS_DEVICE_GET_CLASS(dev);
 113
 114     qdev_connect_gpio_out_named(DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ, n, irq);
 115
 116     if (sbd->connect_irq_notifier) {
 117         sbd->connect_irq_notifier(dev, irq);
 118     }
 119 }
 120
 121 /* Check whether an MMIO region exists */
 122 bool sysbus_has_mmio(SysBusDevice *dev, unsigned int n)
 123 {
 124     return (n < dev->num_mmio);
 125 }
 126
 127 static void sysbus_mmio_map_common(SysBusDevice *dev, int n, hwaddr addr,
 128                                    bool may_overlap, int priority)
 129 {
 130     assert(n >= 0 && n < dev->num_mmio);
 131
 132     if (dev->mmio[n].addr == addr) {
 133         /* ??? region already mapped here.  */
 134         return;
 135     }
 136     if (dev->mmio[n].addr != (hwaddr)-1) {
 137         /* Unregister previous mapping.  */
 138         memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
 139     }
 140     dev->mmio[n].addr = addr;
 141     if (may_overlap) {
 142         memory_region_add_subregion_overlap(get_system_memory(),
 143                                             addr,
 144                                             dev->mmio[n].memory,
 145                                             priority);
 146     }
 147     else {
 148         memory_region_add_subregion(get_system_memory(),
 149                                     addr,
 150                                     dev->mmio[n].memory);
 151     }
 152 }
 153
 154 void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
 155 {
 156     sysbus_mmio_map_common(dev, n, addr, false, 0);
 157 }
 158
 159 void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
 160                              int priority)
 161 {
 162     sysbus_mmio_map_common(dev, n, addr, true, priority);
 163 }
 164
 165 /* Request an IRQ source.  The actual IRQ object may be populated later.  */
 166 void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
 167 {
 168     qdev_init_gpio_out_named(DEVICE(dev), p, SYSBUS_DEVICE_GPIO_IRQ, 1);
 169 }
 170
 171 /* Pass IRQs from a target device.  */
 172 void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)
 173 {
 174     qdev_pass_gpios(DEVICE(target), DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ);
 175 }
 176
 177 void sysbus_init_mmio(SysBusDevice *dev, MemoryRegion *memory)
 178 {
 179     int n;
 180
 181     assert(dev->num_mmio < QDEV_MAX_MMIO);
 182     n = dev->num_mmio++;
 183     dev->mmio[n].addr = -1;
 184     dev->mmio[n].memory = memory;
 185 }
 186
 187 MemoryRegion *sysbus_mmio_get_region(SysBusDevice *dev, int n)
 188 {
 189     return dev->mmio[n].memory;
 190 }
 191
 192 void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size)
 193 {
 194     pio_addr_t i;
 195
 196     for (i = 0; i < size; i++) {
 197         assert(dev->num_pio < QDEV_MAX_PIO);
 198         dev->pio[dev->num_pio++] = ioport++;
 199     }
 200 }
 201
 202 static int sysbus_device_init(DeviceState *dev)
 203 {
 204     SysBusDevice *sd = SYS_BUS_DEVICE(dev);
 205     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(sd);
 206
 207     if (!sbc->init) {
 208         return 0;
 209     }
 210     return sbc->init(sd);
 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     /* for the explicit unit address fallback case: */
 292     char *addr, *fw_dev_path;
 293
 294     if (s->num_mmio) {
 295         return g_strdup_printf("%s@" TARGET_FMT_plx, qdev_fw_name(dev),
 296                                s->mmio[0].addr);
 297     }
 298     if (s->num_pio) {
 299         return g_strdup_printf("%s@i%04x", qdev_fw_name(dev), s->pio[0]);
 300     }
 301     if (sbc->explicit_ofw_unit_address) {
 302         addr = sbc->explicit_ofw_unit_address(s);
 303         if (addr) {
 304             fw_dev_path = g_strdup_printf("%s@%s", qdev_fw_name(dev), addr);
 305             g_free(addr);
 306             return fw_dev_path;
 307         }
 308     }
 309     return g_strdup(qdev_fw_name(dev));
 310 }
 311
 312 void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
 313                        MemoryRegion *mem)
 314 {
 315     memory_region_add_subregion(get_system_io(), addr, mem);
 316 }
 317
 318 MemoryRegion *sysbus_address_space(SysBusDevice *dev)
 319 {
 320     return get_system_memory();
 321 }
 322
 323 static void sysbus_device_class_init(ObjectClass *klass, void *data)
 324 {
 325     DeviceClass *k = DEVICE_CLASS(klass);
 326     k->init = sysbus_device_init;
 327     k->bus_type = TYPE_SYSTEM_BUS;
 328 }
 329
 330 static const TypeInfo sysbus_device_type_info = {
 331     .name = TYPE_SYS_BUS_DEVICE,
 332     .parent = TYPE_DEVICE,
 333     .instance_size = sizeof(SysBusDevice),
 334     .abstract = true,
 335     .class_size = sizeof(SysBusDeviceClass),
 336     .class_init = sysbus_device_class_init,
 337 };
 338
 339 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 340 static BusState *main_system_bus;
 341
 342 static void main_system_bus_create(void)
 343 {
 344     /* assign main_system_bus before qbus_create_inplace()
 345      * in order to make "if (bus != sysbus_get_default())" work */
 346     main_system_bus = g_malloc0(system_bus_info.instance_size);
 347     qbus_create_inplace(main_system_bus, system_bus_info.instance_size,
 348                         TYPE_SYSTEM_BUS, NULL, "main-system-bus");
 349     OBJECT(main_system_bus)->free = g_free;
 350     object_property_add_child(container_get(qdev_get_machine(),
 351                                             "/unattached"),
 352                               "sysbus", OBJECT(main_system_bus), NULL);
 353 }
 354
 355 BusState *sysbus_get_default(void)
 356 {
 357     if (!main_system_bus) {
 358         main_system_bus_create();
 359     }
 360     return main_system_bus;
 361 }
 362
 363 static void sysbus_register_types(void)
 364 {
 365     type_register_static(&system_bus_info);
 366     type_register_static(&sysbus_device_type_info);
 367 }
 368
 369 type_init(sysbus_register_types)