root / hw / ssi.h @ 4b816985
History | View | Annotate | Download (1.2 kB)
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
|