drivers/net/bna/bfa_cs.h

/*
 * Linux network driver for Brocade Converged Network Adapter.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License (GPL) Version 2 as
 * published by the Free Software Foundation
 *
 * 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.  See the GNU
 * General Public License for more details.
 */
/*
 * Copyright (c) 2005-2011 Brocade Communications Systems, Inc.
 * All rights reserved
 * www.brocade.com
 */

/**
 * @file bfa_cs.h BFA common services
 */

#ifndef __BFA_CS_H__
#define __BFA_CS_H__

#include "cna.h"

/**
 * @ BFA state machine interfaces
 */

typedef void (*bfa_sm_t)(void *sm, int event);

/**
 * oc - object class eg. bfa_ioc
 * st - state, eg. reset
 * otype - object type, eg. struct bfa_ioc
 * etype - object type, eg. enum ioc_event
 */
#define bfa_sm_state_decl(oc, st, otype, etype)			\
	static void oc ## _sm_ ## st(otype * fsm, etype event)

#define bfa_sm_set_state(_sm, _state)	((_sm)->sm = (bfa_sm_t)(_state))
#define bfa_sm_send_event(_sm, _event)	((_sm)->sm((_sm), (_event)))
#define bfa_sm_get_state(_sm)		((_sm)->sm)
#define bfa_sm_cmp_state(_sm, _state)	((_sm)->sm == (bfa_sm_t)(_state))

/**
 * For converting from state machine function to state encoding.
 */
struct bfa_sm_table {
	bfa_sm_t	sm;	/*!< state machine function	*/
	int		state;	/*!< state machine encoding	*/
	char		*name;	/*!< state name for display	*/
};
#define BFA_SM(_sm)		((bfa_sm_t)(_sm))

/**
 * State machine with entry actions.
 */
typedef void (*bfa_fsm_t)(void *fsm, int event);

/**
 * oc - object class eg. bfa_ioc
 * st - state, eg. reset
 * otype - object type, eg. struct bfa_ioc
 * etype - object type, eg. enum ioc_event
 */
#define bfa_fsm_state_decl(oc, st, otype, etype)			\
	static void oc ## _sm_ ## st(otype * fsm, etype event);		\
	static void oc ## _sm_ ## st ## _entry(otype * fsm)

#define bfa_fsm_set_state(_fsm, _state) do {				\
	(_fsm)->fsm = (bfa_fsm_t)(_state);				\
	_state ## _entry(_fsm);						\
} while (0)

#define bfa_fsm_send_event(_fsm, _event)	((_fsm)->fsm((_fsm), (_event)))
#define bfa_fsm_get_state(_fsm)			((_fsm)->fsm)
#define bfa_fsm_cmp_state(_fsm, _state)					\
	((_fsm)->fsm == (bfa_fsm_t)(_state))

static inline int
bfa_sm_to_state(const struct bfa_sm_table *smt, bfa_sm_t sm)
{
	int	i = 0;

	while (smt[i].sm && smt[i].sm != sm)
		i++;
	return smt[i].state;
}

/**
 * @ Generic wait counter.
 */

typedef void (*bfa_wc_resume_t) (void *cbarg);

struct bfa_wc {
	bfa_wc_resume_t wc_resume;
	void		*wc_cbarg;
	int		wc_count;
};

static inline void
bfa_wc_up(struct bfa_wc *wc)
{
	wc->wc_count++;
}

static inline void
bfa_wc_down(struct bfa_wc *wc)
{
	wc->wc_count--;
	if (wc->wc_count == 0)
		wc->wc_resume(wc->wc_cbarg);
}

/**
 * Initialize a waiting counter.
 */
static inline void
bfa_wc_init(struct bfa_wc *wc, bfa_wc_resume_t wc_resume, void *wc_cbarg)
{
	wc->wc_resume = wc_resume;
	wc->wc_cbarg = wc_cbarg;
	wc->wc_count = 0;
	bfa_wc_up(wc);
}

/**
 * Wait for counter to reach zero
 */
static inline void
bfa_wc_wait(struct bfa_wc *wc)
{
	bfa_wc_down(wc);
}

#endif /* __BFA_CS_H__ */