Home | History | Annotate | Line # | Download | only in tc
asc_tc.c revision 1.7 
      1 /*	$NetBSD: asc_tc.c,v 1.7 1997/07/28 19:39:26 mhitch 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 #include <dev/tc/tcvar.h>
     22 #include <machine/autoconf.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 	void *ascaddr;
     65 
     66 	if (strncmp(t->ta_modname, "PMAZ-AA ", TC_ROM_LLEN))
     67 		return (0);
     68 
     69 	ascaddr = (void*)t->ta_addr;
     70 
     71 	if (tc_badaddr(ascaddr + ASC_OFFSET_53C94))
     72 		return (0);
     73 
     74 	return (1);
     75 }
     76 
     77 
     78 
     79 void
     80 asc_tc_attach(parent, self, aux)
     81 	struct device *parent;
     82 	struct device *self;
     83 	void *aux;
     84 {
     85 	register struct tc_attach_args *t = aux;
     86 	register asc_softc_t asc = (asc_softc_t) self;
     87 	u_char *buff;
     88 	int i, speed;
     89 
     90 	void *ascaddr;
     91 	int unit;
     92 
     93 	/* Use uncached address for chip registers.  */
     94 	ascaddr = (void*)MIPS_PHYS_TO_KSEG1(t->ta_addr);
     95 	unit = asc->sc_dev.dv_unit;
     96 
     97 	/*
     98 	 * Initialize hw descriptor, cache some pointers
     99 	 */
    100 	asc->regs = (asc_regmap_t *)(ascaddr + ASC_OFFSET_53C94);
    101 
    102 	/*
    103 	 * Set up machine dependencies.
    104 	 * (1) how to do dma
    105 	 * (2) timing based on turbochannel frequency
    106 	 */
    107 
    108 	/*
    109 	 * Fall through for turbochannel option.
    110 	 */
    111 	asc->dmar = (volatile int *)(ascaddr + ASC_OFFSET_DMAR);
    112 	buff = (u_char *)(ascaddr + ASC_OFFSET_RAM);
    113 
    114 	/*
    115 	 * Statically partition the DMA buffer between targets.
    116 	 * This way we will eventually be able to attach/detach
    117 	 * drives on-fly.  And 18k/target is plenty for normal use.
    118 	 */
    119 
    120 	/*
    121 	 * Give each target its own DMA buffer region.
    122 	 * We may want to try ping ponging buffers later.
    123 	 */
    124 	for (i = 0; i < ASC_NCMD; i++)
    125 		asc->st[i].dmaBufAddr = buff + PER_TGT_DMA_SIZE * i;
    126 
    127 	asc->dma_start = tc_dma_start;
    128 	asc->dma_end = tc_dma_end;
    129 
    130 	/*
    131 	 * Now for timing. The 3max has a 25Mhz tb whereas the 3min and
    132 	 * maxine are 12.5Mhz.
    133 	 */
    134 	printf(" (bus speed: %d) ", t->ta_busspeed);
    135 
    136 	switch (t->ta_busspeed) {
    137 	case TC_SPEED_25_MHZ:
    138 		speed = ASC_SPEED_25_MHZ;
    139 		break;
    140 
    141 	default:
    142 		printf(" (unknown TC speed, assuming 12.5MHz) ");
    143 		/* FALLTHROUGH*/
    144 	case TC_SPEED_12_5_MHZ:
    145 		speed = ASC_SPEED_12_5_MHZ;
    146 		break;
    147 	};
    148 
    149 	ascattach(asc, speed);
    150 
    151 	/* tie pseudo-slot to device */
    152 	tc_intr_establish(parent, t->ta_cookie, TC_IPL_BIO,
    153 			  asc_intr, asc);
    154 }
    155 
    156 
    157 /*
    158  * DMA handling routines. For a turbochannel device, just set the dmar.
    159  * For the I/O ASIC, handle the actual DMA interface.
    160  */
    161 static int
    162 tc_dma_start(asc, state, cp, flag, len, off)
    163 	asc_softc_t asc;
    164 	State *state;
    165 	caddr_t cp;
    166 	int flag;
    167 	int len;
    168 	int off;
    169 {
    170 
    171 	if (len > PER_TGT_DMA_SIZE)
    172 		len = PER_TGT_DMA_SIZE;
    173 	if (flag == ASCDMA_WRITE)
    174 		bcopy(cp, state->dmaBufAddr + off, len);
    175 	if (flag == ASCDMA_WRITE)
    176 		*asc->dmar = ASC_DMAR_WRITE | ASC_DMA_ADDR(state->dmaBufAddr + off);
    177 	else
    178 		*asc->dmar = ASC_DMA_ADDR(state->dmaBufAddr + off);
    179 	return (len);
    180 }
    181 
    182 static void
    183 tc_dma_end(asc, state, flag)
    184 	asc_softc_t asc;
    185 	State *state;
    186 	int flag;
    187 {
    188 	if (flag == ASCDMA_READ)
    189 		bcopy(state->dmaBufAddr, state->buf, state->dmalen);
    190 }
    191