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 #define TYPE_SSI_SLAVE "ssi-slave"
  19 #define SSI_SLAVE(obj) \
  20      OBJECT_CHECK(SSISlave, (obj), TYPE_SSI_SLAVE)
  21 #define SSI_SLAVE_CLASS(klass) \
  22      OBJECT_CLASS_CHECK(SSISlaveClass, (klass), TYPE_SSI_SLAVE)
  23 #define SSI_SLAVE_GET_CLASS(obj) \
  24      OBJECT_GET_CLASS(SSISlaveClass, (obj), TYPE_SSI_SLAVE)
  25
  26 /* Slave devices.  */
  27 typedef struct SSISlaveClass {
  28     DeviceClass parent_class;
  29
  30     int (*init)(SSISlave *dev);
  31     uint32_t (*transfer)(SSISlave *dev, uint32_t val);
  32 } SSISlaveClass;
  33
  34 struct SSISlave {
  35     DeviceState qdev;
  36 };
  37
  38 #define SSI_SLAVE_FROM_QDEV(dev) DO_UPCAST(SSISlave, qdev, dev)
  39 #define FROM_SSI_SLAVE(type, dev) DO_UPCAST(type, ssidev, dev)
  40
  41 DeviceState *ssi_create_slave(SSIBus *bus, const char *name);
  42
  43 /* Master interface.  */
  44 SSIBus *ssi_create_bus(DeviceState *parent, const char *name);
  45
  46 uint32_t ssi_transfer(SSIBus *bus, uint32_t val);
  47
  48 /* max111x.c */
  49 void max111x_set_input(DeviceState *dev, int line, uint8_t value);
  50
  51 #endif