1 /* $NetBSD: sbcvar.h,v 1.15 2024/11/22 07:16:01 nat 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 /* 42 * This structure is used to keep track of PDMA requests. 43 */ 44 struct sbc_pdma_handle { 45 int dh_flags; /* flags */ 46 #define SBC_DH_BUSY 0x01 /* This handle is in use */ 47 #define SBC_DH_OUT 0x02 /* PDMA data out (write) */ 48 #define SBC_DH_DONE 0x04 /* PDMA transfer is complete */ 49 u_char *dh_addr; /* data buffer */ 50 int dh_len; /* length of data buffer */ 51 }; 52 53 /* 54 * The first structure member has to be the ncr5380_softc 55 * so we can just cast to go back and forth between them. 56 */ 57 struct sbc_softc { 58 struct ncr5380_softc ncr_sc; 59 volatile struct sbc_regs *sc_regs; 60 volatile vaddr_t sc_drq_addr; 61 volatile vaddr_t sc_nodrq_addr; 62 void (*sc_clrintr)(struct ncr5380_softc *); 63 volatile int sc_resid; 64 int sc_options; /* options for this instance. */ 65 struct sbc_pdma_handle sc_pdma[SCI_OPENINGS]; 66 kmutex_t sc_drq_lock; 67 }; 68 69 /* 70 * Options. By default, SCSI interrupts and reselect are disabled. 71 * You may enable either of these features with the `flags' directive 72 * in your kernel's configuration file. 73 * 74 * Alternatively, you can patch your kernel with DDB or some other 75 * mechanism. The sc_options member of the softc is OR'd with 76 * the value in sbc_options. 77 * 78 * The options code is based on the sparc 'si' driver's version of 79 * the same. 80 */ 81 #define SBC_PDMA 0x01 /* Use PDMA for polled transfers */ 82 #define SBC_INTR 0x02 /* Allow SCSI IRQ/DRQ interrupts */ 83 #define SBC_RESELECT 0x04 /* Allow disconnect/reselect */ 84 #define SBC_PDMA_NO_WRITE 0x08 /* No PDMA for writes */ 85 #define SBC_OPTIONS_MASK (SBC_PDMA_NO_WRITE|SBC_RESELECT|SBC_INTR|SBC_PDMA) 86 #define SBC_OPTIONS_BITS "\10\4NOWRITE\3RESELECT\2INTR\1PDMA" 87 88 extern int sbc_debug; 89 extern int sbc_link_flags; 90 extern int sbc_options; 91 92 int sbc_pdma_in(struct ncr5380_softc *, int, int, u_char *); 93 int sbc_pdma_out(struct ncr5380_softc *, int, int, u_char *); 94 void sbc_irq_intr(void *); 95 void sbc_drq_intr(void *); 96 void sbc_dma_alloc(struct ncr5380_softc *); 97 void sbc_dma_free(struct ncr5380_softc *); 98 void sbc_dma_poll(struct ncr5380_softc *); 99 void sbc_dma_setup(struct ncr5380_softc *); 100 void sbc_dma_start(struct ncr5380_softc *); 101 void sbc_dma_eop(struct ncr5380_softc *); 102 void sbc_dma_stop(struct ncr5380_softc *); 103 #ifdef SBC_DEBUG 104 void decode_5380_intr(struct ncr5380_softc *); 105 #endif 106