funnyos/sys/bus.h - diff

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version 1.3, 2007/10/16 19:31:07

version 1.7, 2007/10/25 20:58:47

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#ifndef _SYS_BUS_H

#define _SYS_BUS_H

#include <sys/device.h>

#include <sys/types.h>

* Each bus (bus driver instance) has its own bus_handle.

* Device drivers attached to bus aquire bus_handle to perform all bus i/o.

struct bus_handle {

void *bh_ownerdd; /* devdata of device that owns this handler XXX kill that it is ugly */

uint8_t (*bus_read_1)(void *ddp, uint32_t addr);

uint16_t (*bus_read_2)(void *ddp, uint32_t addr);

uint32_t (*bus_read_4)(void *ddp, uint32_t addr);

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/* XXX DMA related stuff */

};

#define bus_read_1(dev, addr) ((struct busops *)dev->dv_devdata)->bus_read_1(dev, addr)

#define bus_write_1(dev, addr, data) ((struct busops *)dev->dv_devdata)->bus_write_1(dev, addr, data)

uint8_t bus_read_1(struct bus_handle *bhp, uint32_t addr);

uint16_t bus_read_2(struct bus_handle *bhp, uint32_t addr);

uint32_t bus_read_4(struct bus_handle *bhp, uint32_t addr);

int bus_write_1(struct bus_handle *bhp, uint32_t addr, uint8_t data);

int bus_write_2(struct bus_handle *bhp, uint32_t addr, uint16_t data);

int bus_write_4(struct bus_handle *bhp, uint32_t addr, uint32_t data);

#endif /* _SYS_BUS_H */