root / hw / ssi.h @ 8a637d44
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1 | 90d37239 | Paul Brook | /* QEMU Synchronous Serial Interface support. */
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2 | 90d37239 | Paul Brook | |
3 | 90d37239 | Paul Brook | /* In principle SSI is a point-point interface. As such the qemu
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4 | 90d37239 | Paul Brook | implementation has a single slave device on a "bus".
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5 | 90d37239 | Paul Brook | However it is fairly common for boards to have multiple slaves
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6 | 90d37239 | Paul Brook | connected to a single master, and select devices with an external
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7 | 90d37239 | Paul Brook | chip select. This is implemented in qemu by having an explicit mux device.
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8 | 90d37239 | Paul Brook | It is assumed that master and slave are both using the same transfer width.
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9 | 90d37239 | Paul Brook | */
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10 | 90d37239 | Paul Brook | |
11 | 90d37239 | Paul Brook | #ifndef QEMU_SSI_H
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12 | 90d37239 | Paul Brook | #define QEMU_SSI_H
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13 | 90d37239 | Paul Brook | |
14 | 90d37239 | Paul Brook | #include "qdev.h" |
15 | 90d37239 | Paul Brook | |
16 | 90d37239 | Paul Brook | typedef struct SSISlave SSISlave; |
17 | 90d37239 | Paul Brook | |
18 | 90d37239 | Paul Brook | /* Slave devices. */
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19 | 90d37239 | Paul Brook | typedef struct { |
20 | 90d37239 | Paul Brook | void (*init)(SSISlave *dev);
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21 | 90d37239 | Paul Brook | uint32_t (*transfer)(SSISlave *dev, uint32_t val); |
22 | 90d37239 | Paul Brook | } SSISlaveInfo; |
23 | 90d37239 | Paul Brook | |
24 | 90d37239 | Paul Brook | struct SSISlave {
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25 | 90d37239 | Paul Brook | DeviceState qdev; |
26 | 90d37239 | Paul Brook | SSISlaveInfo *info; |
27 | 90d37239 | Paul Brook | }; |
28 | 90d37239 | Paul Brook | |
29 | 90d37239 | Paul Brook | #define SSI_SLAVE_FROM_QDEV(dev) DO_UPCAST(SSISlave, qdev, dev)
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30 | 90d37239 | Paul Brook | #define FROM_SSI_SLAVE(type, dev) DO_UPCAST(type, ssidev, dev)
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31 | 90d37239 | Paul Brook | |
32 | 90d37239 | Paul Brook | void ssi_register_slave(const char *name, int size, SSISlaveInfo *info); |
33 | 90d37239 | Paul Brook | |
34 | 90d37239 | Paul Brook | DeviceState *ssi_create_slave(SSIBus *bus, const char *name); |
35 | 90d37239 | Paul Brook | |
36 | 90d37239 | Paul Brook | /* Master interface. */
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37 | 90d37239 | Paul Brook | SSIBus *ssi_create_bus(void);
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38 | 90d37239 | Paul Brook | |
39 | 90d37239 | Paul Brook | uint32_t ssi_transfer(SSIBus *bus, uint32_t val); |
40 | 90d37239 | Paul Brook | |
41 | a984a69e | Paul Brook | /* max111x.c */
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42 | a984a69e | Paul Brook | void max111x_set_input(DeviceState *dev, int line, uint8_t value); |
43 | a984a69e | Paul Brook | |
44 | 90d37239 | Paul Brook | #endif |