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