hw/ssi.c

   1 /*
   2  * QEMU Synchronous Serial Interface support
   3  *
   4  * Copyright (c) 2009 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licenced under the GNU GPL v2.
   8  */
   9
  10 #include "ssi.h"
  11
  12 struct SSIBus {
  13     SSISlave *slave;
  14 };
  15
  16 static void ssi_slave_init(DeviceState *dev, void *opaque)
  17 {
  18     SSISlaveInfo *info = opaque;
  19     SSISlave *s = SSI_SLAVE_FROM_QDEV(dev);
  20     SSIBus *bus = qdev_get_bus(dev);
  21
  22     bus->slave = s;
  23     s->info = info;
  24     info->init(s);
  25 }
  26
  27 void ssi_register_slave(const char *name, int size, SSISlaveInfo *info)
  28 {
  29     assert(size >= sizeof(SSISlave));
  30     qdev_register(name, size, ssi_slave_init, info);
  31 }
  32
  33 DeviceState *ssi_create_slave(SSIBus *bus, const char *name)
  34 {
  35     DeviceState *dev;
  36     dev = qdev_create(bus, name);
  37     qdev_init(dev);
  38     return dev;
  39 }
  40
  41 SSIBus *ssi_create_bus(void)
  42 {
  43     return qemu_mallocz(sizeof(SSIBus));
  44 }
  45
  46 uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
  47 {
  48     if (!bus->slave) {
  49         return 0;
  50     }
  51     return bus->slave->info->transfer(bus->slave, val);
  52 }