xref: /netbsd/sys/arch/next68k/dev/espvar.h (revision bf9ec67e)
1 /*	$NetBSD: espvar.h,v 1.12 2001/09/14 18:29:08 jdolecek Exp $	*/
2 
3 /*-
4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
9  * NASA Ames Research Center.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  * 3. All advertising materials mentioning features or use of this software
20  *    must display the following acknowledgement:
21  *	This product includes software developed by the NetBSD
22  *	Foundation, Inc. and its contributors.
23  * 4. Neither the name of The NetBSD Foundation nor the names of its
24  *    contributors may be used to endorse or promote products derived
25  *    from this software without specific prior written permission.
26  *
27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37  * POSSIBILITY OF SUCH DAMAGE.
38  */
39 
40 struct esp_softc {
41 	struct ncr53c9x_softc sc_ncr53c9x;	/* glue to MI code */
42 	struct nextdma_config sc_scsi_dma;
43 	bus_space_tag_t	sc_bst;
44 	bus_space_handle_t sc_bsh;	/* the device registers */
45 
46 	caddr_t *sc_dmaaddr;		/* saved argument to esp_dma_setup */
47 	size_t  *sc_dmalen;		/* saved argument to esp_dma_setup */
48 	size_t  sc_dmasize;		/* saved argument to esp_dma_setup */
49 	int sc_datain;			/* saved argument to esp_dma_setup */
50 
51 #define ESP_LOADED_MAIN   (0x01)
52 #define ESP_LOADED_TAIL   (0x02)
53 #define ESP_UNLOADED_MAIN (0x10)
54 #define ESP_UNLOADED_TAIL (0x20)
55 
56 	int sc_loaded;			/* used by continue callback to remember
57 					 * which dmamaps are already loaded.
58 					 */
59 
60 	/* To deal with begin alignment problems, we stuff the fifo
61 	 * with a begin buffer
62 	 */
63 	caddr_t       sc_begin;		/* pointer to start io buf, NULL if invalid */
64 	size_t        sc_begin_size;	/*  */
65 
66 	bus_dmamap_t  sc_main_dmamap;	/* i/o dma map */
67 	caddr_t       sc_main;		/* pointer to main io buf, NULL if invalid */
68 	size_t        sc_main_size;	/* aligned length of main io buf we are using */
69 
70 	/* To deal with end alignment problems, we copy the end of the dma
71 	 * buffer into a "tail" buffer that we can control more carefully.
72 	 * We then chain this extra buffer onto the end.
73 	 */
74 #define ESP_DMA_OVERRUN 0x30 /* 3*DMA_ENDALIGNMENT */
75 #define ESP_DMA_MAXTAIL 128
76 #define ESP_DMA_TAILBUFSIZE (ESP_DMA_MAXTAIL+2*DMA_ENDALIGNMENT+ESP_DMA_OVERRUN)
77 	bus_dmamap_t  sc_tail_dmamap;
78 	caddr_t sc_tail;	/* pointer into sc_tailbuf, NULL if invalid */
79 	size_t  sc_tail_size;	/* aligned length of tailbuf we are using */
80 	u_char sc_tailbuf[ESP_DMA_TAILBUFSIZE];
81 };
82