1/*
 2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 3 *
 4 *   This program is free software; you can redistribute it and/or
 5 *   modify it under the terms of the GNU General Public License
 6 *   as published by the Free Software Foundation, version 2.
 7 *
 8 *   This program is distributed in the hope that it will be useful, but
 9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 *   NON INFRINGEMENT.  See the GNU General Public License for
12 *   more details.
13 *
14 * This header defines a wrapper interface for managing hypervisor
15 * device calls that will result in an interrupt at some later time.
16 * In particular, this provides wrappers for hv_preada() and
17 * hv_pwritea().
18 */
19
20#ifndef _ASM_TILE_HV_DRIVER_H
21#define _ASM_TILE_HV_DRIVER_H
22
23#include <hv/hypervisor.h>
24
25struct hv_driver_cb;
26
27/* A callback to be invoked when an operation completes. */
28typedef void hv_driver_callback_t(struct hv_driver_cb *cb, __hv32 result);
29
30/*
31 * A structure to hold information about an outstanding call.
32 * The driver must allocate a separate structure for each call.
33 */
34struct hv_driver_cb {
35	hv_driver_callback_t *callback;  /* Function to call on interrupt. */
36	void *dev;                       /* Driver-specific state variable. */
37};
38
39/* Wrapper for invoking hv_dev_preada(). */
40static inline int
41tile_hv_dev_preada(int devhdl, __hv32 flags, __hv32 sgl_len,
42		   HV_SGL sgl[/* sgl_len */], __hv64 offset,
43		   struct hv_driver_cb *callback)
44{
45	return hv_dev_preada(devhdl, flags, sgl_len, sgl,
46			     offset, (HV_IntArg)callback);
47}
48
49/* Wrapper for invoking hv_dev_pwritea(). */
50static inline int
51tile_hv_dev_pwritea(int devhdl, __hv32 flags, __hv32 sgl_len,
52		    HV_SGL sgl[/* sgl_len */], __hv64 offset,
53		    struct hv_driver_cb *callback)
54{
55	return hv_dev_pwritea(devhdl, flags, sgl_len, sgl,
56			      offset, (HV_IntArg)callback);
57}
58
59
60#endif /* _ASM_TILE_HV_DRIVER_H */