hw/ssi.h

   1 /* QEMU Synchronous Serial Interface support.  */
   2
   3 /* In principle SSI is a point-point interface.  As such the qemu
   4    implementation has a single slave device on a "bus".
   5    However it is fairly common for boards to have multiple slaves
   6    connected to a single master, and select devices with an external
   7    chip select.  This is implemented in qemu by having an explicit mux device.
   8    It is assumed that master and slave are both using the same transfer width.
   9    */
  10
  11 #ifndef QEMU_SSI_H
  12 #define QEMU_SSI_H
  13
  14 #include "qdev.h"
  15
  16 typedef struct SSISlave SSISlave;
  17
  18 /* Slave devices.  */
  19 typedef struct {
  20     void (*init)(SSISlave *dev);
  21     uint32_t (*transfer)(SSISlave *dev, uint32_t val);
  22 } SSISlaveInfo;
  23
  24 struct SSISlave {
  25     DeviceState qdev;
  26     SSISlaveInfo *info;
  27 };
  28
  29 #define SSI_SLAVE_FROM_QDEV(dev) DO_UPCAST(SSISlave, qdev, dev)
  30 #define FROM_SSI_SLAVE(type, dev) DO_UPCAST(type, ssidev, dev)
  31
  32 void ssi_register_slave(const char *name, int size, SSISlaveInfo *info);
  33
  34 DeviceState *ssi_create_slave(SSIBus *bus, const char *name);
  35
  36 /* Master interface.  */
  37 SSIBus *ssi_create_bus(void);
  38
  39 uint32_t ssi_transfer(SSIBus *bus, uint32_t val);
  40
  41 /* max111x.c */
  42 void max111x_set_input(DeviceState *dev, int line, uint8_t value);
  43
  44 #endif