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      1 /*	$NetBSD: espvar.h,v 1.20 2023/02/03 23:16:07 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 
     33 struct 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