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 "sysemu.h"
  22 #include "monitor.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         cpu_register_physical_memory(dev->mmio[n].addr, dev->mmio[n].size,
  54                                      IO_MEM_UNASSIGNED);
  55     }
  56     dev->mmio[n].addr = addr;
  57     if (dev->mmio[n].cb) {
  58         dev->mmio[n].cb(dev, addr);
  59     } else {
  60         cpu_register_physical_memory(addr, dev->mmio[n].size,
  61                                      dev->mmio[n].iofunc);
  62     }
  63 }
  64
  65
  66 /* Request an IRQ source.  The actual IRQ object may be populated later.  */
  67 void sysbus_init_irq(SysBusDevice *dev, qemu_irq *p)
  68 {
  69     int n;
  70
  71     assert(dev->num_irq < QDEV_MAX_IRQ);
  72     n = dev->num_irq++;
  73     dev->irqp[n] = p;
  74 }
  75
  76 /* Pass IRQs from a target device.  */
  77 void sysbus_pass_irq(SysBusDevice *dev, SysBusDevice *target)
  78 {
  79     int i;
  80     assert(dev->num_irq == 0);
  81     dev->num_irq = target->num_irq;
  82     for (i = 0; i < dev->num_irq; i++) {
  83         dev->irqp[i] = target->irqp[i];
  84     }
  85 }
  86
  87 void sysbus_init_mmio(SysBusDevice *dev, target_phys_addr_t size,
  88                       ram_addr_t iofunc)
  89 {
  90     int n;
  91
  92     assert(dev->num_mmio < QDEV_MAX_MMIO);
  93     n = dev->num_mmio++;
  94     dev->mmio[n].addr = -1;
  95     dev->mmio[n].size = size;
  96     dev->mmio[n].iofunc = iofunc;
  97 }
  98
  99 void sysbus_init_mmio_cb(SysBusDevice *dev, target_phys_addr_t size,
 100                          mmio_mapfunc cb)
 101 {
 102     int n;
 103
 104     assert(dev->num_mmio < QDEV_MAX_MMIO);
 105     n = dev->num_mmio++;
 106     dev->mmio[n].addr = -1;
 107     dev->mmio[n].size = size;
 108     dev->mmio[n].cb = cb;
 109 }
 110
 111 void sysbus_init_ioports(SysBusDevice *dev, pio_addr_t ioport, pio_addr_t size)
 112 {
 113     pio_addr_t i;
 114
 115     for (i = 0; i < size; i++) {
 116         assert(dev->num_pio < QDEV_MAX_PIO);
 117         dev->pio[dev->num_pio++] = ioport++;
 118     }
 119 }
 120
 121 static int sysbus_device_init(DeviceState *dev, DeviceInfo *base)
 122 {
 123     SysBusDeviceInfo *info = container_of(base, SysBusDeviceInfo, qdev);
 124
 125     return info->init(sysbus_from_qdev(dev));
 126 }
 127
 128 void sysbus_register_withprop(SysBusDeviceInfo *info)
 129 {
 130     info->qdev.init = sysbus_device_init;
 131     info->qdev.bus_info = &system_bus_info;
 132
 133     assert(info->qdev.size >= sizeof(SysBusDevice));
 134     qdev_register(&info->qdev);
 135 }
 136
 137 void sysbus_register_dev(const char *name, size_t size, sysbus_initfn init)
 138 {
 139     SysBusDeviceInfo *info;
 140
 141     info = qemu_mallocz(sizeof(*info));
 142     info->qdev.name = qemu_strdup(name);
 143     info->qdev.size = size;
 144     info->init = init;
 145     sysbus_register_withprop(info);
 146 }
 147
 148 DeviceState *sysbus_create_varargs(const char *name,
 149                                    target_phys_addr_t addr, ...)
 150 {
 151     DeviceState *dev;
 152     SysBusDevice *s;
 153     va_list va;
 154     qemu_irq irq;
 155     int n;
 156
 157     dev = qdev_create(NULL, name);
 158     s = sysbus_from_qdev(dev);
 159     qdev_init_nofail(dev);
 160     if (addr != (target_phys_addr_t)-1) {
 161         sysbus_mmio_map(s, 0, addr);
 162     }
 163     va_start(va, addr);
 164     n = 0;
 165     while (1) {
 166         irq = va_arg(va, qemu_irq);
 167         if (!irq) {
 168             break;
 169         }
 170         sysbus_connect_irq(s, n, irq);
 171         n++;
 172     }
 173     return dev;
 174 }
 175
 176 DeviceState *sysbus_try_create_varargs(const char *name,
 177                                        target_phys_addr_t addr, ...)
 178 {
 179     DeviceState *dev;
 180     SysBusDevice *s;
 181     va_list va;
 182     qemu_irq irq;
 183     int n;
 184
 185     dev = qdev_try_create(NULL, name);
 186     if (!dev) {
 187         return NULL;
 188     }
 189     s = sysbus_from_qdev(dev);
 190     qdev_init_nofail(dev);
 191     if (addr != (target_phys_addr_t)-1) {
 192         sysbus_mmio_map(s, 0, addr);
 193     }
 194     va_start(va, addr);
 195     n = 0;
 196     while (1) {
 197         irq = va_arg(va, qemu_irq);
 198         if (!irq) {
 199             break;
 200         }
 201         sysbus_connect_irq(s, n, irq);
 202         n++;
 203     }
 204     return dev;
 205 }
 206
 207 static void sysbus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 208 {
 209     SysBusDevice *s = sysbus_from_qdev(dev);
 210     int i;
 211
 212     monitor_printf(mon, "%*sirq %d\n", indent, "", s->num_irq);
 213     for (i = 0; i < s->num_mmio; i++) {
 214         monitor_printf(mon, "%*smmio " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
 215                        indent, "", s->mmio[i].addr, s->mmio[i].size);
 216     }
 217 }
 218
 219 static char *sysbus_get_fw_dev_path(DeviceState *dev)
 220 {
 221     SysBusDevice *s = sysbus_from_qdev(dev);
 222     char path[40];
 223     int off;
 224
 225     off = snprintf(path, sizeof(path), "%s", qdev_fw_name(dev));
 226
 227     if (s->num_mmio) {
 228         snprintf(path + off, sizeof(path) - off, "@"TARGET_FMT_plx,
 229                  s->mmio[0].addr);
 230     } else if (s->num_pio) {
 231         snprintf(path + off, sizeof(path) - off, "@i%04x", s->pio[0]);
 232     }
 233
 234     return strdup(path);
 235 }