mirror of https://gitee.com/openkylin/qemu.git
52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/* QEMU Synchronous Serial Interface support. */
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/* In principle SSI is a point-point interface. As such the qemu
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implementation has a single slave device on a "bus".
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However it is fairly common for boards to have multiple slaves
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connected to a single master, and select devices with an external
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chip select. This is implemented in qemu by having an explicit mux device.
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It is assumed that master and slave are both using the same transfer width.
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*/
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#ifndef QEMU_SSI_H
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#define QEMU_SSI_H
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#include "qdev.h"
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typedef struct SSISlave SSISlave;
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#define TYPE_SSI_SLAVE "ssi-slave"
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#define SSI_SLAVE(obj) \
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OBJECT_CHECK(SSISlave, (obj), TYPE_SSI_SLAVE)
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#define SSI_SLAVE_CLASS(klass) \
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OBJECT_CLASS_CHECK(SSISlaveClass, (klass), TYPE_SSI_SLAVE)
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#define SSI_SLAVE_GET_CLASS(obj) \
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OBJECT_GET_CLASS(SSISlaveClass, (obj), TYPE_SSI_SLAVE)
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/* Slave devices. */
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typedef struct SSISlaveClass {
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DeviceClass parent_class;
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int (*init)(SSISlave *dev);
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uint32_t (*transfer)(SSISlave *dev, uint32_t val);
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} SSISlaveClass;
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struct SSISlave {
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DeviceState qdev;
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};
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#define SSI_SLAVE_FROM_QDEV(dev) DO_UPCAST(SSISlave, qdev, dev)
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#define FROM_SSI_SLAVE(type, dev) DO_UPCAST(type, ssidev, dev)
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DeviceState *ssi_create_slave(SSIBus *bus, const char *name);
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/* Master interface. */
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SSIBus *ssi_create_bus(DeviceState *parent, const char *name);
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uint32_t ssi_transfer(SSIBus *bus, uint32_t val);
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/* max111x.c */
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void max111x_set_input(DeviceState *dev, int line, uint8_t value);
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#endif
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