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     qdev_connect_gpio_out_named(DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ, n, irq);
 113 }
 114
 115 /* Check whether an MMIO region exists */
 116 bool sysbus_has_mmio(SysBusDevice *dev, unsigned int n)
 117 {
 118     return (n < dev->num_mmio);
 119 }
 120
 121 static void sysbus_mmio_map_common(SysBusDevice *dev, int n, hwaddr addr,
 122                                    bool may_overlap, int priority)
 123 {
 124     assert(n >= 0 && n < dev->num_mmio);
 125
 126     if (dev->mmio[n].addr == addr) {
 127         /* ??? region already mapped here.  */
 128         return;
 129     }
 130     if (dev->mmio[n].addr != (hwaddr)-1) {
 131         /* Unregister previous mapping.  */
 132         memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
 133     }
 134     dev->mmio[n].addr = addr;
 135     if (may_overlap) {
 136         memory_region_add_subregion_overlap(get_system_memory(),
 137                                             addr,
 138                                             dev->mmio[n].memory,
 139                                             priority);
 140     }
 141     else {
 142         memory_region_add_subregion(get_system_memory(),
 143                                     addr,
 144                                     dev->mmio[n].memory);
 145     }
 146 }
 147
 148 void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
 149 {
 150     sysbus_mmio_map_common(dev, n, addr, false, 0);
 151 }
 152
 153 void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
 154                              int priority)
 155 {
 156     sysbus_mmio_map_common(dev, n, addr, true, priority);
 157 }
 158
 159 /* Request an IRQ source.  The actual IRQ object may be populated later.  */
 160 void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
 161 {
 162     qdev_init_gpio_out_named(DEVICE(dev), p, SYSBUS_DEVICE_GPIO_IRQ, 1);
 163 }
 164
 165 /* Pass IRQs from a target device.  */
 166 void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)
 167 {
 168     qdev_pass_gpios(DEVICE(target), DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ);
 169 }
 170
 171 void sysbus_init_mmio(SysBusDevice *dev, MemoryRegion *memory)
 172 {
 173     int n;
 174
 175     assert(dev->num_mmio < QDEV_MAX_MMIO);
 176     n = dev->num_mmio++;
 177     dev->mmio[n].addr = -1;
 178     dev->mmio[n].memory = memory;
 179 }
 180
 181 MemoryRegion *sysbus_mmio_get_region(SysBusDevice *dev, int n)
 182 {
 183     return dev->mmio[n].memory;
 184 }
 185
 186 void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size)
 187 {
 188     pio_addr_t i;
 189
 190     for (i = 0; i < size; i++) {
 191         assert(dev->num_pio < QDEV_MAX_PIO);
 192         dev->pio[dev->num_pio++] = ioport++;
 193     }
 194 }
 195
 196 static int sysbus_device_init(DeviceState *dev)
 197 {
 198     SysBusDevice *sd = SYS_BUS_DEVICE(dev);
 199     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(sd);
 200
 201     if (!sbc->init) {
 202         return 0;
 203     }
 204     return sbc->init(sd);
 205 }
 206
 207 DeviceState *sysbus_create_varargs(const char *name,
 208                                    hwaddr addr, ...)
 209 {
 210     DeviceState *dev;
 211     SysBusDevice *s;
 212     va_list va;
 213     qemu_irq irq;
 214     int n;
 215
 216     dev = qdev_create(NULL, name);
 217     s = SYS_BUS_DEVICE(dev);
 218     qdev_init_nofail(dev);
 219     if (addr != (hwaddr)-1) {
 220         sysbus_mmio_map(s, 0, addr);
 221     }
 222     va_start(va, addr);
 223     n = 0;
 224     while (1) {
 225         irq = va_arg(va, qemu_irq);
 226         if (!irq) {
 227             break;
 228         }
 229         sysbus_connect_irq(s, n, irq);
 230         n++;
 231     }
 232     va_end(va);
 233     return dev;
 234 }
 235
 236 DeviceState *sysbus_try_create_varargs(const char *name,
 237                                        hwaddr addr, ...)
 238 {
 239     DeviceState *dev;
 240     SysBusDevice *s;
 241     va_list va;
 242     qemu_irq irq;
 243     int n;
 244
 245     dev = qdev_try_create(NULL, name);
 246     if (!dev) {
 247         return NULL;
 248     }
 249     s = SYS_BUS_DEVICE(dev);
 250     qdev_init_nofail(dev);
 251     if (addr != (hwaddr)-1) {
 252         sysbus_mmio_map(s, 0, addr);
 253     }
 254     va_start(va, addr);
 255     n = 0;
 256     while (1) {
 257         irq = va_arg(va, qemu_irq);
 258         if (!irq) {
 259             break;
 260         }
 261         sysbus_connect_irq(s, n, irq);
 262         n++;
 263     }
 264     va_end(va);
 265     return dev;
 266 }
 267
 268 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 269 {
 270     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 271     hwaddr size;
 272     int i;
 273
 274     for (i = 0; i < s->num_mmio; i++) {
 275         size = memory_region_size(s->mmio[i].memory);
 276         monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
 277                        indent, "", s->mmio[i].addr, size);
 278     }
 279 }
 280
 281 static char *sysbus_get_fw_dev_path(DeviceState *dev)
 282 {
 283     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 284
 285     if (s->num_mmio) {
 286         return g_strdup_printf("%s@" TARGET_FMT_plx, qdev_fw_name(dev),
 287                                s->mmio[0].addr);
 288     }
 289     if (s->num_pio) {
 290         return g_strdup_printf("%s@i%04x", qdev_fw_name(dev), s->pio[0]);
 291     }
 292     return g_strdup(qdev_fw_name(dev));
 293 }
 294
 295 void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
 296                        MemoryRegion *mem)
 297 {
 298     memory_region_add_subregion(get_system_io(), addr, mem);
 299 }
 300
 301 MemoryRegion *sysbus_address_space(SysBusDevice *dev)
 302 {
 303     return get_system_memory();
 304 }
 305
 306 static void sysbus_device_class_init(ObjectClass *klass, void *data)
 307 {
 308     DeviceClass *k = DEVICE_CLASS(klass);
 309     k->init = sysbus_device_init;
 310     k->bus_type = TYPE_SYSTEM_BUS;
 311 }
 312
 313 static const TypeInfo sysbus_device_type_info = {
 314     .name = TYPE_SYS_BUS_DEVICE,
 315     .parent = TYPE_DEVICE,
 316     .instance_size = sizeof(SysBusDevice),
 317     .abstract = true,
 318     .class_size = sizeof(SysBusDeviceClass),
 319     .class_init = sysbus_device_class_init,
 320 };
 321
 322 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 323 static BusState *main_system_bus;
 324
 325 static void main_system_bus_create(void)
 326 {
 327     /* assign main_system_bus before qbus_create_inplace()
 328      * in order to make "if (bus != sysbus_get_default())" work */
 329     main_system_bus = g_malloc0(system_bus_info.instance_size);
 330     qbus_create_inplace(main_system_bus, system_bus_info.instance_size,
 331                         TYPE_SYSTEM_BUS, NULL, "main-system-bus");
 332     OBJECT(main_system_bus)->free = g_free;
 333     object_property_add_child(container_get(qdev_get_machine(),
 334                                             "/unattached"),
 335                               "sysbus", OBJECT(main_system_bus), NULL);
 336 }
 337
 338 BusState *sysbus_get_default(void)
 339 {
 340     if (!main_system_bus) {
 341         main_system_bus_create();
 342     }
 343     return main_system_bus;
 344 }
 345
 346 static void sysbus_register_types(void)
 347 {
 348     type_register_static(&system_bus_info);
 349     type_register_static(&sysbus_device_type_info);
 350 }
 351
 352 type_init(sysbus_register_types)