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SSP bus framework

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Signed-off-by: Paul Brook <paul@codesourcery.com>
This commit is contained in:
Paul Brook 2009-05-14 22:35:09 +01:00
parent 1de9610c8f
commit 90d37239d4
4 changed files with 95 additions and 1 deletions
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41
hw/ssi.h Normal file
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/* QEMU Synchronous Serial Interface support. */
/* In principle SSI is a point-point interface. As such the qemu
implementation has a single slave device on a "bus".
However it is fairly common for boards to have multiple slaves
connected to a single master, and select devices with an external
chip select. This is implemented in qemu by having an explicit mux device.
It is assumed that master and slave are both using the same transfer width.
*/
#ifndef QEMU_SSI_H
#define QEMU_SSI_H
#include "qdev.h"
typedef struct SSISlave SSISlave;
/* Slave devices. */
typedef struct {
void (*init)(SSISlave *dev);
uint32_t (*transfer)(SSISlave *dev, uint32_t val);
} SSISlaveInfo;
struct SSISlave {
DeviceState qdev;
SSISlaveInfo *info;
};
#define SSI_SLAVE_FROM_QDEV(dev) DO_UPCAST(SSISlave, qdev, dev)
#define FROM_SSI_SLAVE(type, dev) DO_UPCAST(type, ssidev, dev)
void ssi_register_slave(const char *name, int size, SSISlaveInfo *info);
DeviceState *ssi_create_slave(SSIBus *bus, const char *name);
/* Master interface. */
SSIBus *ssi_create_bus(void);
uint32_t ssi_transfer(SSIBus *bus, uint32_t val);
#endif