Paul Brook | 90d3723 | 2009-05-14 22:35:09 +0100 | [diff] [blame] | 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 { |
Paul Brook | 02e2da4 | 2009-05-23 00:05:19 +0100 | [diff] [blame] | 20 | DeviceInfo qdev; |
Gerd Hoffmann | 81a322d | 2009-08-14 10:36:05 +0200 | [diff] [blame] | 21 | int (*init)(SSISlave *dev); |
Paul Brook | 90d3723 | 2009-05-14 22:35:09 +0100 | [diff] [blame] | 22 | uint32_t (*transfer)(SSISlave *dev, uint32_t val); |
| 23 | } SSISlaveInfo; |
| 24 | |
| 25 | struct SSISlave { |
| 26 | DeviceState qdev; |
| 27 | SSISlaveInfo *info; |
| 28 | }; |
| 29 | |
| 30 | #define SSI_SLAVE_FROM_QDEV(dev) DO_UPCAST(SSISlave, qdev, dev) |
| 31 | #define FROM_SSI_SLAVE(type, dev) DO_UPCAST(type, ssidev, dev) |
| 32 | |
Gerd Hoffmann | 074f2ff | 2009-06-10 09:41:42 +0200 | [diff] [blame] | 33 | void ssi_register_slave(SSISlaveInfo *info); |
Paul Brook | 90d3723 | 2009-05-14 22:35:09 +0100 | [diff] [blame] | 34 | |
| 35 | DeviceState *ssi_create_slave(SSIBus *bus, const char *name); |
| 36 | |
| 37 | /* Master interface. */ |
Paul Brook | 02e2da4 | 2009-05-23 00:05:19 +0100 | [diff] [blame] | 38 | SSIBus *ssi_create_bus(DeviceState *parent, const char *name); |
Paul Brook | 90d3723 | 2009-05-14 22:35:09 +0100 | [diff] [blame] | 39 | |
| 40 | uint32_t ssi_transfer(SSIBus *bus, uint32_t val); |
| 41 | |
Paul Brook | a984a69 | 2009-05-14 22:35:09 +0100 | [diff] [blame] | 42 | /* max111x.c */ |
| 43 | void max111x_set_input(DeviceState *dev, int line, uint8_t value); |
| 44 | |
Paul Brook | 90d3723 | 2009-05-14 22:35:09 +0100 | [diff] [blame] | 45 | #endif |