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 void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
  88 {
  89     qdev_connect_gpio_out_named(DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ, n, irq);
  90 }
  91
  92 static void sysbus_mmio_map_common(SysBusDevice *dev, int n, hwaddr addr,
  93                                    bool may_overlap, int priority)
  94 {
  95     assert(n >= 0 && n < dev->num_mmio);
  96
  97     if (dev->mmio[n].addr == addr) {
  98         /* ??? region already mapped here.  */
  99         return;
 100     }
 101     if (dev->mmio[n].addr != (hwaddr)-1) {
 102         /* Unregister previous mapping.  */
 103         memory_region_del_subregion(get_system_memory(), dev->mmio[n].memory);
 104     }
 105     dev->mmio[n].addr = addr;
 106     if (may_overlap) {
 107         memory_region_add_subregion_overlap(get_system_memory(),
 108                                             addr,
 109                                             dev->mmio[n].memory,
 110                                             priority);
 111     }
 112     else {
 113         memory_region_add_subregion(get_system_memory(),
 114                                     addr,
 115                                     dev->mmio[n].memory);
 116     }
 117 }
 118
 119 void sysbus_mmio_map(SysBusDevice *dev, int n, hwaddr addr)
 120 {
 121     sysbus_mmio_map_common(dev, n, addr, false, 0);
 122 }
 123
 124 void sysbus_mmio_map_overlap(SysBusDevice *dev, int n, hwaddr addr,
 125                              int priority)
 126 {
 127     sysbus_mmio_map_common(dev, n, addr, true, priority);
 128 }
 129
 130 /* Request an IRQ source.  The actual IRQ object may be populated later.  */
 131 void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
 132 {
 133     qdev_init_gpio_out_named(DEVICE(dev), p, SYSBUS_DEVICE_GPIO_IRQ, 1);
 134 }
 135
 136 /* Pass IRQs from a target device.  */
 137 void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)
 138 {
 139     qdev_pass_gpios(DEVICE(target), DEVICE(dev), SYSBUS_DEVICE_GPIO_IRQ);
 140 }
 141
 142 void sysbus_init_mmio(SysBusDevice *dev, MemoryRegion *memory)
 143 {
 144     int n;
 145
 146     assert(dev->num_mmio < QDEV_MAX_MMIO);
 147     n = dev->num_mmio++;
 148     dev->mmio[n].addr = -1;
 149     dev->mmio[n].memory = memory;
 150 }
 151
 152 MemoryRegion *sysbus_mmio_get_region(SysBusDevice *dev, int n)
 153 {
 154     return dev->mmio[n].memory;
 155 }
 156
 157 void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size)
 158 {
 159     pio_addr_t i;
 160
 161     for (i = 0; i < size; i++) {
 162         assert(dev->num_pio < QDEV_MAX_PIO);
 163         dev->pio[dev->num_pio++] = ioport++;
 164     }
 165 }
 166
 167 static int sysbus_device_init(DeviceState *dev)
 168 {
 169     SysBusDevice *sd = SYS_BUS_DEVICE(dev);
 170     SysBusDeviceClass *sbc = SYS_BUS_DEVICE_GET_CLASS(sd);
 171
 172     if (!sbc->init) {
 173         return 0;
 174     }
 175     return sbc->init(sd);
 176 }
 177
 178 DeviceState *sysbus_create_varargs(const char *name,
 179                                    hwaddr addr, ...)
 180 {
 181     DeviceState *dev;
 182     SysBusDevice *s;
 183     va_list va;
 184     qemu_irq irq;
 185     int n;
 186
 187     dev = qdev_create(NULL, name);
 188     s = SYS_BUS_DEVICE(dev);
 189     qdev_init_nofail(dev);
 190     if (addr != (hwaddr)-1) {
 191         sysbus_mmio_map(s, 0, addr);
 192     }
 193     va_start(va, addr);
 194     n = 0;
 195     while (1) {
 196         irq = va_arg(va, qemu_irq);
 197         if (!irq) {
 198             break;
 199         }
 200         sysbus_connect_irq(s, n, irq);
 201         n++;
 202     }
 203     va_end(va);
 204     return dev;
 205 }
 206
 207 DeviceState *sysbus_try_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_try_create(NULL, name);
 217     if (!dev) {
 218         return NULL;
 219     }
 220     s = SYS_BUS_DEVICE(dev);
 221     qdev_init_nofail(dev);
 222     if (addr != (hwaddr)-1) {
 223         sysbus_mmio_map(s, 0, addr);
 224     }
 225     va_start(va, addr);
 226     n = 0;
 227     while (1) {
 228         irq = va_arg(va, qemu_irq);
 229         if (!irq) {
 230             break;
 231         }
 232         sysbus_connect_irq(s, n, irq);
 233         n++;
 234     }
 235     va_end(va);
 236     return dev;
 237 }
 238
 239 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 240 {
 241     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 242     hwaddr size;
 243     int i;
 244
 245     for (i = 0; i < s->num_mmio; i++) {
 246         size = memory_region_size(s->mmio[i].memory);
 247         monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
 248                        indent, "", s->mmio[i].addr, size);
 249     }
 250 }
 251
 252 static char *sysbus_get_fw_dev_path(DeviceState *dev)
 253 {
 254     SysBusDevice *s = SYS_BUS_DEVICE(dev);
 255     char path[40];
 256     int off;
 257
 258     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 259
 260     if (s->num_mmio) {
 261         snprintf(path + off, sizeof(path) - off, "@"TARGET_FMT_plx,
 262                  s->mmio[0].addr);
 263     } else if (s->num_pio) {
 264         snprintf(path + off, sizeof(path) - off, "@i%04x", s->pio[0]);
 265     }
 266
 267     return g_strdup(path);
 268 }
 269
 270 void sysbus_add_io(SysBusDevice *dev, hwaddr addr,
 271                        MemoryRegion *mem)
 272 {
 273     memory_region_add_subregion(get_system_io(), addr, mem);
 274 }
 275
 276 MemoryRegion *sysbus_address_space(SysBusDevice *dev)
 277 {
 278     return get_system_memory();
 279 }
 280
 281 static void sysbus_device_class_init(ObjectClass *klass, void *data)
 282 {
 283     DeviceClass *k = DEVICE_CLASS(klass);
 284     k->init = sysbus_device_init;
 285     k->bus_type = TYPE_SYSTEM_BUS;
 286 }
 287
 288 static const TypeInfo sysbus_device_type_info = {
 289     .name = TYPE_SYS_BUS_DEVICE,
 290     .parent = TYPE_DEVICE,
 291     .instance_size = sizeof(SysBusDevice),
 292     .abstract = true,
 293     .class_size = sizeof(SysBusDeviceClass),
 294     .class_init = sysbus_device_class_init,
 295 };
 296
 297 /* This is a nasty hack to allow passing a NULL bus to qdev_create.  */
 298 static BusState *main_system_bus;
 299
 300 static void main_system_bus_create(void)
 301 {
 302     /* assign main_system_bus before qbus_create_inplace()
 303      * in order to make "if (bus != sysbus_get_default())" work */
 304     main_system_bus = g_malloc0(system_bus_info.instance_size);
 305     qbus_create_inplace(main_system_bus, system_bus_info.instance_size,
 306                         TYPE_SYSTEM_BUS, NULL, "main-system-bus");
 307     OBJECT(main_system_bus)->free = g_free;
 308     object_property_add_child(container_get(qdev_get_machine(),
 309                                             "/unattached"),
 310                               "sysbus", OBJECT(main_system_bus), NULL);
 311 }
 312
 313 BusState *sysbus_get_default(void)
 314 {
 315     if (!main_system_bus) {
 316         main_system_bus_create();
 317     }
 318     return main_system_bus;
 319 }
 320
 321 static void sysbus_register_types(void)
 322 {
 323     type_register_static(&system_bus_info);
 324     type_register_static(&sysbus_device_type_info);
 325 }
 326
 327 type_init(sysbus_register_types)