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asc_tc.c revision 1.12 
      1 /*	$NetBSD: asc_tc.c,v 1.12 2000/02/11 01:32:42 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright 1996 The Board of Trustees of The Leland Stanford
      5  * Junior University. All Rights Reserved.
      6  *
      7  * Permission to use, copy, modify, and distribute this
      8  * software and its documentation for any purpose and without
      9  * fee is hereby granted, provided that the above copyright
     10  * notice appear in all copies.  Stanford University
     11  * makes no representations about the suitability of this
     12  * software for any purpose.  It is provided "as is" without
     13  * express or implied warranty.
     14  *
     15  */
     16 
     17 #include <sys/param.h>
     18 #include <sys/systm.h>
     19 #include <sys/types.h>
     20 #include <sys/device.h>
     21 
     22 #include <dev/tc/tcvar.h>
     23 #include <dev/tc/ioasicvar.h>
     24 
     25 #include <pmax/dev/device.h>	/* XXX */
     26 #include <pmax/dev/scsi.h>	/* XXX */
     27 
     28 #include <pmax/dev/ascreg.h>	/* XXX */
     29 #include <dev/tc/ascvar.h>
     30 
     31 /*XXX*/
     32 
     33 
     34 /*
     35  * Autoconfiguration data for config.
     36  */
     37 int asc_tc_match __P((struct device *, struct cfdata *, void *));
     38 void asc_tc_attach __P((struct device *, struct device *, void *));
     39 
     40 struct cfattach asc_tc_ca = {
     41 	sizeof(struct asc_softc), asc_tc_match, asc_tc_attach
     42 };
     43 
     44 /*
     45  * DMA callbacks
     46  */
     47 
     48 static int
     49 tc_dma_start __P((struct asc_softc *asc, struct scsi_state *state,
     50 		  caddr_t cp, int flag, int len, int off));
     51 
     52 static void
     53 tc_dma_end __P((struct asc_softc *asc, struct scsi_state *state,
     54 		int flag));
     55 
     56 
     57 int
     58 asc_tc_match(parent, match, aux)
     59 	struct device *parent;
     60 	struct cfdata *match;
     61 	void *aux;
     62 {
     63 	struct tc_attach_args *t = aux;
     64 
     65 	if (strncmp(t->ta_modname, "PMAZ-AA ", TC_ROM_LLEN))
     66 		return (0);
     67 
     68 	return (1);
     69 }
     70 
     71 
     72 
     73 void
     74 asc_tc_attach(parent, self, aux)
     75 	struct device *parent;
     76 	struct device *self;
     77 	void *aux;
     78 {
     79 	register struct tc_attach_args *t = aux;
     80 	register asc_softc_t asc = (asc_softc_t) self;
     81 	u_char *buff;
     82 	int i, speed;
     83 	int unit;
     84 
     85 	unit = asc->sc_dev.dv_unit;
     86 
     87 	/*
     88 	 * Initialize hw descriptor, cache some pointers
     89 	 */
     90 	asc->regs = (asc_regmap_t *)(t->ta_addr + ASC_OFFSET_53C94);
     91 
     92 	/*
     93 	 * Set up machine dependencies.
     94 	 * (1) how to do dma
     95 	 * (2) timing based on turbochannel frequency
     96 	 */
     97 
     98 	/*
     99 	 * Fall through for turbochannel option.
    100 	 */
    101 	asc->dmar = (volatile int *)(t->ta_addr + ASC_OFFSET_DMAR);
    102 	buff = (u_char *)(t->ta_addr + ASC_OFFSET_RAM);
    103 
    104 	/*
    105 	 * Statically partition the DMA buffer between targets.
    106 	 * This way we will eventually be able to attach/detach
    107 	 * drives on-fly.  And 18k/target is plenty for normal use.
    108 	 */
    109 
    110 	/*
    111 	 * Give each target its own DMA buffer region.
    112 	 * We may want to try ping ponging buffers later.
    113 	 */
    114 	for (i = 0; i < ASC_NCMD; i++)
    115 		asc->st[i].dmaBufAddr = buff + PER_TGT_DMA_SIZE * i;
    116 
    117 	asc->dma_start = tc_dma_start;
    118 	asc->dma_end = tc_dma_end;
    119 
    120 	/*
    121 	 * Now for timing. The 3max has a 25Mhz tb whereas the 3min and
    122 	 * maxine are 12.5Mhz.
    123 	 */
    124 	printf(" (bus speed: %s MHz) ", t->ta_busspeed? "25"  : "12.5");
    125 
    126 	switch (t->ta_busspeed) {
    127 	case TC_SPEED_25_MHZ:
    128 		speed = ASC_SPEED_25_MHZ;
    129 		break;
    130 
    131 	default:
    132 		printf(" (unknown TC speed, assuming 12.5MHz) ");
    133 		/* FALLTHROUGH*/
    134 	case TC_SPEED_12_5_MHZ:
    135 		speed = ASC_SPEED_12_5_MHZ;
    136 		break;
    137 	};
    138 
    139 	ascattach(asc, speed);
    140 
    141 	/* tie pseudo-slot to device */
    142 	tc_intr_establish(parent, t->ta_cookie, TC_IPL_BIO,
    143 			  asc_intr, asc);
    144 }
    145 
    146 
    147 /*
    148  * DMA handling routines. For a turbochannel device, just set the dmar.
    149  * For the I/O ASIC, handle the actual DMA interface.
    150  */
    151 static int
    152 tc_dma_start(asc, state, cp, flag, len, off)
    153 	asc_softc_t asc;
    154 	State *state;
    155 	caddr_t cp;
    156 	int flag;
    157 	int len;
    158 	int off;
    159 {
    160 
    161 	if (len > PER_TGT_DMA_SIZE)
    162 		len = PER_TGT_DMA_SIZE;
    163 	if (flag == ASCDMA_WRITE)
    164 		bcopy(cp, state->dmaBufAddr + off, len);
    165 	if (flag == ASCDMA_WRITE)
    166 		*asc->dmar = ASC_DMAR_WRITE | ASC_DMA_ADDR(state->dmaBufAddr + off);
    167 	else
    168 		*asc->dmar = ASC_DMA_ADDR(state->dmaBufAddr + off);
    169 	return (len);
    170 }
    171 
    172 static void
    173 tc_dma_end(asc, state, flag)
    174 	asc_softc_t asc;
    175 	State *state;
    176 	int flag;
    177 {
    178 	if (flag == ASCDMA_READ)
    179 		bcopy(state->dmaBufAddr, state->buf, state->dmalen);
    180 }
    181