1 /* $NetBSD: sbcvar.h,v 1.4 1997/10/10 05:55:07 scottr Exp $ */ 2 3 /* 4 * Copyright (C) 1996 Scott Reynolds. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Transfers smaller than this are done using PIO 31 * (on assumption they're not worth PDMA overhead) 32 */ 33 #define MIN_DMA_LEN 128 34 35 /* 36 * Transfers larger than 8192 bytes need to be split up 37 * due to the size of the PDMA space. 38 */ 39 #define MAX_DMA_LEN 0x2000 40 41 #ifdef SBC_DEBUG 42 # define SBC_DB_INTR 0x01 43 # define SBC_DB_DMA 0x02 44 # define SBC_DB_REG 0x04 45 # define SBC_DB_BREAK 0x08 46 # ifndef DDB 47 # define Debugger() printf("Debug: sbc.c:%d\n", __LINE__) 48 # endif 49 # define SBC_BREAK \ 50 do { if (sbc_debug & SBC_DB_BREAK) Debugger(); } while (0) 51 #else 52 # define SBC_BREAK 53 #endif 54 55 /* 56 * This structure is used to keep track of PDMA requests. 57 */ 58 struct sbc_pdma_handle { 59 int dh_flags; /* flags */ 60 #define SBC_DH_BUSY 0x01 /* This handle is in use */ 61 #define SBC_DH_OUT 0x02 /* PDMA data out (write) */ 62 #define SBC_DH_DONE 0x04 /* PDMA transfer is complete */ 63 u_char *dh_addr; /* data buffer */ 64 int dh_len; /* length of data buffer */ 65 }; 66 67 /* 68 * The first structure member has to be the ncr5380_softc 69 * so we can just cast to go back and forth between them. 70 */ 71 struct sbc_softc { 72 struct ncr5380_softc ncr_sc; 73 volatile struct sbc_regs *sc_regs; 74 volatile vm_offset_t sc_drq_addr; 75 volatile vm_offset_t sc_nodrq_addr; 76 void (*sc_clrintr) __P((struct ncr5380_softc *)); 77 int sc_options; /* options for this instance. */ 78 struct sbc_pdma_handle sc_pdma[SCI_OPENINGS]; 79 }; 80 81 /* 82 * Options. By default, SCSI interrupts and reselect are disabled. 83 * You may enable either of these features with the `flags' directive 84 * in your kernel's configuration file. 85 * 86 * Alternatively, you can patch your kernel with DDB or some other 87 * mechanism. The sc_options member of the softc is OR'd with 88 * the value in sbc_options. 89 * 90 * The options code is based on the sparc 'si' driver's version of 91 * the same. 92 */ 93 #define SBC_PDMA 0x01 /* Use PDMA for polled transfers */ 94 #define SBC_INTR 0x02 /* Allow SCSI IRQ/DRQ interrupts */ 95 #define SBC_RESELECT 0x04 /* Allow disconnect/reselect */ 96 #define SBC_OPTIONS_MASK (SBC_RESELECT|SBC_INTR|SBC_PDMA) 97 #define SBC_OPTIONS_BITS "\10\3RESELECT\2INTR\1PDMA" 98 99 extern int sbc_debug; 100 extern int sbc_link_flags; 101 extern int sbc_options; 102 extern struct scsipi_adapter sbc_ops; 103 extern struct scsipi_device sbc_dev; 104 105 int sbc_pdma_in __P((struct ncr5380_softc *, int, int, u_char *)); 106 int sbc_pdma_out __P((struct ncr5380_softc *, int, int, u_char *)); 107 void sbc_irq_intr __P((void *)); 108 void sbc_drq_intr __P((void *)); 109 void sbc_dma_alloc __P((struct ncr5380_softc *)); 110 void sbc_dma_free __P((struct ncr5380_softc *)); 111 void sbc_dma_poll __P((struct ncr5380_softc *)); 112 void sbc_dma_setup __P((struct ncr5380_softc *)); 113 void sbc_dma_start __P((struct ncr5380_softc *)); 114 void sbc_dma_eop __P((struct ncr5380_softc *)); 115 void sbc_dma_stop __P((struct ncr5380_softc *)); 116 #ifdef SBC_DEBUG 117 void decode_5380_intr __P((struct ncr5380_softc *)); 118 #endif 119