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twevar.h revision 1.12 
      1 /*	$NetBSD: twevar.h,v 1.12 2002/05/24 18:10:07 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2000, 2001, 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Andrew Doran.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #ifndef _PCI_TWEVAR_H_
     40 #define	_PCI_TWEVAR_H_
     41 
     42 #include "locators.h"
     43 
     44 #define	TWE_MAX_QUEUECNT	129
     45 
     46 /* Per-controller state. */
     47 struct twe_softc {
     48 	struct device		sc_dv;
     49 	bus_space_tag_t		sc_iot;
     50 	bus_space_handle_t	sc_ioh;
     51 	bus_dma_tag_t		sc_dmat;
     52 	bus_dmamap_t		sc_dmamap;
     53 	void			*sc_ih;
     54 	caddr_t			sc_cmds;
     55 	bus_addr_t		sc_cmds_paddr;
     56 	int			sc_nccbs;
     57 	struct twe_ccb		*sc_ccbs;
     58 	SIMPLEQ_HEAD(, twe_ccb)	sc_ccb_queue;
     59 	SLIST_HEAD(, twe_ccb)	sc_ccb_freelist;
     60 	int			sc_flags;
     61 	int			sc_nunits;
     62 	u_int			sc_dsize[TWE_MAX_UNITS];
     63 };
     64 #define	TWEF_AEN	0x01	/* retrieving an AEN */
     65 
     66 /* Optional per-command context. */
     67 struct twe_context {
     68 	void	(*tx_handler)(struct twe_ccb *, int);
     69 	void 	*tx_context;
     70 	struct	device	*tx_dv;
     71 };
     72 
     73 /* Command control block. */
     74 struct twe_ccb {
     75 	union {
     76 		SIMPLEQ_ENTRY(twe_ccb) simpleq;
     77 		SLIST_ENTRY(twe_ccb) slist;
     78 	} ccb_chain;
     79 	struct twe_cmd	*ccb_cmd;
     80 	int		ccb_cmdid;
     81 	int		ccb_flags;
     82 	void		*ccb_data;
     83 	int		ccb_datasize;
     84 	vaddr_t		ccb_abuf;
     85 	bus_dmamap_t	ccb_dmamap_xfer;
     86 	struct twe_context ccb_tx;
     87 };
     88 #define	TWE_CCB_DATA_IN		0x01	/* Map describes inbound xfer */
     89 #define	TWE_CCB_DATA_OUT	0x02	/* Map describes outbound xfer */
     90 #define	TWE_CCB_COMPLETE	0x04	/* Command completed */
     91 #define	TWE_CCB_ACTIVE		0x08	/* Command active */
     92 #define	TWE_CCB_PARAM		0x10	/* For parameter retrieval */
     93 #define	TWE_CCB_ALLOCED		0x20	/* CCB allocated */
     94 
     95 struct twe_attach_args {
     96 	int		twea_unit;
     97 };
     98 
     99 #define	tweacf_unit	cf_loc[TWECF_UNIT]
    100 
    101 int	twe_ccb_alloc(struct twe_softc *, struct twe_ccb **, int);
    102 void	twe_ccb_enqueue(struct twe_softc *sc, struct twe_ccb *ccb);
    103 void	twe_ccb_free(struct twe_softc *sc, struct twe_ccb *);
    104 int	twe_ccb_map(struct twe_softc *, struct twe_ccb *);
    105 int	twe_ccb_poll(struct twe_softc *, struct twe_ccb *, int);
    106 int	twe_ccb_submit(struct twe_softc *, struct twe_ccb *);
    107 void	twe_ccb_unmap(struct twe_softc *, struct twe_ccb *);
    108 
    109 static __inline__ size_t twe_get_maxsegs(void) {
    110 	size_t max_segs = ((MAXPHYS + PAGE_SIZE - 1) / PAGE_SIZE) + 1;
    111 #ifdef TWE_SG_SIZE
    112 	if (TWE_SG_SIZE < max_segs)
    113 	    max_segs = TWE_SG_SIZE;
    114 #endif
    115 	return max_segs;
    116 }
    117 
    118 static __inline__ size_t twe_get_maxxfer(size_t maxsegs) {
    119 	return (maxsegs - 1) * PAGE_SIZE;
    120 }
    121 
    122 #endif	/* !_PCI_TWEVAR_H_ */
    123