arch/tile/include/asm/hv_driver.h

/*
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 *
 * This header defines a wrapper interface for managing hypervisor
 * device calls that will result in an interrupt at some later time.
 * In particular, this provides wrappers for hv_preada() and
 * hv_pwritea().
 */

#ifndef _ASM_TILE_HV_DRIVER_H
#define _ASM_TILE_HV_DRIVER_H

#include <hv/hypervisor.h>

struct hv_driver_cb;

/* A callback to be invoked when an operation completes. */
typedef void hv_driver_callback_t(struct hv_driver_cb *cb, __hv32 result);

/*
 * A structure to hold information about an outstanding call.
 * The driver must allocate a separate structure for each call.
 */
struct hv_driver_cb {
	hv_driver_callback_t *callback;  /* Function to call on interrupt. */
	void *dev;                       /* Driver-specific state variable. */
};

/* Wrapper for invoking hv_dev_preada(). */
static inline int
tile_hv_dev_preada(int devhdl, __hv32 flags, __hv32 sgl_len,
		   HV_SGL sgl[/* sgl_len */], __hv64 offset,
		   struct hv_driver_cb *callback)
{
	return hv_dev_preada(devhdl, flags, sgl_len, sgl,
			     offset, (HV_IntArg)callback);
}

/* Wrapper for invoking hv_dev_pwritea(). */
static inline int
tile_hv_dev_pwritea(int devhdl, __hv32 flags, __hv32 sgl_len,
		    HV_SGL sgl[/* sgl_len */], __hv64 offset,
		    struct hv_driver_cb *callback)
{
	return hv_dev_pwritea(devhdl, flags, sgl_len, sgl,
			      offset, (HV_IntArg)callback);
}


#endif /* _ASM_TILE_HV_DRIVER_H */