1/*	$NetBSD: espvar.h,v 1.18 2008/04/13 04:55:52 tsutsui 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 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33struct esp_softc {
34	struct ncr53c9x_softc sc_ncr53c9x;	/* glue to MI code */
35	struct nextdma_softc *sc_dma;
36	bus_space_tag_t	sc_bst;
37	bus_space_handle_t sc_bsh;	/* the device registers */
38
39	uint8_t **sc_dmaaddr;		/* saved argument to esp_dma_setup */
40	size_t *sc_dmalen;		/* saved argument to esp_dma_setup */
41	size_t sc_dmasize;		/* saved argument to esp_dma_setup */
42	int sc_datain;			/* saved argument to esp_dma_setup */
43
44#define ESP_LOADED_MAIN   (0x01)
45#define ESP_LOADED_TAIL   (0x02)
46#define ESP_UNLOADED_MAIN (0x10)
47#define ESP_UNLOADED_TAIL (0x20)
48
49	int sc_loaded;			/* used by continue callback to remember
50					 * which dmamaps are already loaded.
51					 */
52
53	/* To deal with begin alignment problems, we stuff the fifo
54	 * with a begin buffer
55	 */
56	uint8_t *sc_begin;	/* pointer to start io buf, NULL if invalid */
57	size_t sc_begin_size;		/*  */
58
59	bus_dmamap_t sc_main_dmamap;	/* I/O DMA map */
60	uint8_t *sc_main;	/* pointer to main io buf, NULL if invalid */
61	size_t sc_main_size;	/* aligned length of main io buf we are using */
62
63	/* To deal with end alignment problems, we copy the end of the DMA
64	 * buffer into a "tail" buffer that we can control more carefully.
65	 * We then chain this extra buffer onto the end.
66	 */
67#define ESP_DMA_OVERRUN 0x30 /* 3*DMA_ENDALIGNMENT */
68#define ESP_DMA_MAXTAIL 128
69#define ESP_DMA_TAILBUFSIZE (ESP_DMA_MAXTAIL+2*DMA_ENDALIGNMENT+ESP_DMA_OVERRUN)
70	bus_dmamap_t  sc_tail_dmamap;
71	uint8_t *sc_tail;	/* pointer into sc_tailbuf, NULL if invalid */
72	size_t  sc_tail_size;	/* aligned length of tailbuf we are using */
73	uint8_t sc_tailbuf[ESP_DMA_TAILBUFSIZE];
74};
75
76#ifndef ESP_MAX_DMASIZE
77#define ESP_MAX_DMASIZE MAX_DMASIZE
78#endif
79