hw/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 "sysbus.h"
  21 #include "monitor.h"
  22 #include "exec-memory.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 struct BusInfo system_bus_info = {
  28     .name       = "System",
  29     .size       = sizeof(BusState),
  30     .print_dev  = sysbus_dev_print,
  31     .get_fw_dev_path = sysbus_get_fw_dev_path,
  32 };
  33
  34 void sysbus_connect_irq(SysBusDevice *dev, int n, qemu_irq irq)
  35 {
  36     assert(n >= 0 && n < dev->num_irq);
  37     dev->irqs[n] = NULL;
  38     if (dev->irqp[n]) {
  39         *dev->irqp[n] = irq;
  40     }
  41 }
  42
  43 void sysbus_mmio_map(SysBusDevice *dev, int n, target_phys_addr_t addr)
  44 {
  45     assert(n >= 0 && n < dev->num_mmio);
  46
  47     if (dev->mmio[n].addr == addr) {
  48         /* ??? region already mapped here.  */
  49         return;
  50     }
  51     if (dev->mmio[n].addr != (target_phys_addr_t)-1) {
  52         /* Unregister previous mapping.  */
  53         if (dev->mmio[n].memory) {
  54             memory_region_del_subregion(get_system_memory(),
  55                                         dev->mmio[n].memory);
  56         } else if (dev->mmio[n].unmap) {
  57             dev->mmio[n].unmap(dev, dev->mmio[n].addr);
  58         } else {
  59             cpu_register_physical_memory(dev->mmio[n].addr, dev->mmio[n].size,
  60                                          IO_MEM_UNASSIGNED);
  61         }
  62     }
  63     dev->mmio[n].addr = addr;
  64     if (dev->mmio[n].memory) {
  65         memory_region_add_subregion(get_system_memory(),
  66                                     addr,
  67                                     dev->mmio[n].memory);
  68     } else if (dev->mmio[n].cb) {
  69         dev->mmio[n].cb(dev, addr);
  70     } else {
  71         cpu_register_physical_memory(addr, dev->mmio[n].size,
  72                                      dev->mmio[n].iofunc);
  73     }
  74 }
  75
  76
  77 /* Request an IRQ source.  The actual IRQ object may be populated later.  */
  78 void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
  79 {
  80     int n;
  81
  82     assert(dev->num_irq < QDEV_MAX_IRQ);
  83     n = dev->num_irq++;
  84     dev->irqp[n] = p;
  85 }
  86
  87 /* Pass IRQs from a target device.  */
  88 void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)
  89 {
  90     int i;
  91     assert(dev->num_irq == 0);
  92     dev->num_irq = target->num_irq;
  93     for (i = 0; i < dev->num_irq; i++) {
  94         dev->irqp[i] = target->irqp[i];
  95     }
  96 }
  97
  98 void sysbus_init_mmio(SysBusDevice *dev, target_phys_addr_t size,
  99                       ram_addr_t iofunc)
 100 {
 101     int n;
 102
 103     assert(dev->num_mmio < QDEV_MAX_MMIO);
 104     n = dev->num_mmio++;
 105     dev->mmio[n].addr = -1;
 106     dev->mmio[n].size = size;
 107     dev->mmio[n].iofunc = iofunc;
 108 }
 109
 110 void sysbus_init_mmio_cb2(SysBusDevice *dev,
 111                           mmio_mapfunc cb, mmio_mapfunc unmap)
 112 {
 113     int n;
 114
 115     assert(dev->num_mmio < QDEV_MAX_MMIO);
 116     n = dev->num_mmio++;
 117     dev->mmio[n].addr = -1;
 118     dev->mmio[n].size = 0;
 119     dev->mmio[n].cb = cb;
 120     dev->mmio[n].unmap = unmap;
 121 }
 122
 123 void sysbus_init_mmio_region(SysBusDevice *dev, MemoryRegion *memory)
 124 {
 125     int n;
 126
 127     assert(dev->num_mmio < QDEV_MAX_MMIO);
 128     n = dev->num_mmio++;
 129     dev->mmio[n].addr = -1;
 130     dev->mmio[n].size = memory_region_size(memory);
 131     dev->mmio[n].memory = memory;
 132 }
 133
 134 void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size)
 135 {
 136     pio_addr_t i;
 137
 138     for (i = 0; i < size; i++) {
 139         assert(dev->num_pio < QDEV_MAX_PIO);
 140         dev->pio[dev->num_pio++] = ioport++;
 141     }
 142 }
 143
 144 static int sysbus_device_init(DeviceState *dev, DeviceInfo *base)
 145 {
 146     SysBusDeviceInfo *info = container_of(base, SysBusDeviceInfo, qdev);
 147
 148     return info->init(sysbus_from_qdev(dev));
 149 }
 150
 151 void sysbus_register_withprop(SysBusDeviceInfo *info)
 152 {
 153     info->qdev.init = sysbus_device_init;
 154     info->qdev.bus_info = &system_bus_info;
 155
 156     assert(info->qdev.size >= sizeof(SysBusDevice));
 157     qdev_register(&info->qdev);
 158 }
 159
 160 void sysbus_register_dev(const char *name, size_t size, sysbus_initfn init)
 161 {
 162     SysBusDeviceInfo *info;
 163
 164     info = g_malloc0(sizeof(*info));
 165     info->qdev.name = g_strdup(name);
 166     info->qdev.size = size;
 167     info->init = init;
 168     sysbus_register_withprop(info);
 169 }
 170
 171 DeviceState *sysbus_create_varargs(const char *name,
 172                                    target_phys_addr_t addr, ...)
 173 {
 174     DeviceState *dev;
 175     SysBusDevice *s;
 176     va_list va;
 177     qemu_irq irq;
 178     int n;
 179
 180     dev = qdev_create(NULL, name);
 181     s = sysbus_from_qdev(dev);
 182     qdev_init_nofail(dev);
 183     if (addr != (target_phys_addr_t)-1) {
 184         sysbus_mmio_map(s, 0, addr);
 185     }
 186     va_start(va, addr);
 187     n = 0;
 188     while (1) {
 189         irq = va_arg(va, qemu_irq);
 190         if (!irq) {
 191             break;
 192         }
 193         sysbus_connect_irq(s, n, irq);
 194         n++;
 195     }
 196     return dev;
 197 }
 198
 199 DeviceState *sysbus_try_create_varargs(const char *name,
 200                                        target_phys_addr_t addr, ...)
 201 {
 202     DeviceState *dev;
 203     SysBusDevice *s;
 204     va_list va;
 205     qemu_irq irq;
 206     int n;
 207
 208     dev = qdev_try_create(NULL, name);
 209     if (!dev) {
 210         return NULL;
 211     }
 212     s = sysbus_from_qdev(dev);
 213     qdev_init_nofail(dev);
 214     if (addr != (target_phys_addr_t)-1) {
 215         sysbus_mmio_map(s, 0, addr);
 216     }
 217     va_start(va, addr);
 218     n = 0;
 219     while (1) {
 220         irq = va_arg(va, qemu_irq);
 221         if (!irq) {
 222             break;
 223         }
 224         sysbus_connect_irq(s, n, irq);
 225         n++;
 226     }
 227     return dev;
 228 }
 229
 230 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 231 {
 232     SysBusDevice *s = sysbus_from_qdev(dev);
 233     int i;
 234
 235     monitor_printf(mon, "%*sirq %d\n", indent, "", s->num_irq);
 236     for (i = 0; i < s->num_mmio; i++) {
 237         monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
 238                        indent, "", s->mmio[i].addr, s->mmio[i].size);
 239     }
 240 }
 241
 242 static char *sysbus_get_fw_dev_path(DeviceState *dev)
 243 {
 244     SysBusDevice *s = sysbus_from_qdev(dev);
 245     char path[40];
 246     int off;
 247
 248     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 249
 250     if (s->num_mmio) {
 251         snprintf(path + off, sizeof(path) - off, "@"TARGET_FMT_plx,
 252                  s->mmio[0].addr);
 253     } else if (s->num_pio) {
 254         snprintf(path + off, sizeof(path) - off, "@i%04x", s->pio[0]);
 255     }
 256
 257     return strdup(path);
 258 }