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asc_tc.c revision 1.7.6.1
      1  1.7.6.1    mellon /*	$NetBSD: asc_tc.c,v 1.7.6.1 1997/10/31 07:55:12 mellon Exp $	*/
      2      1.1  jonathan 
      3      1.1  jonathan /*
      4      1.1  jonathan  * Copyright 1996 The Board of Trustees of The Leland Stanford
      5      1.1  jonathan  * Junior University. All Rights Reserved.
      6      1.1  jonathan  *
      7      1.1  jonathan  * Permission to use, copy, modify, and distribute this
      8      1.1  jonathan  * software and its documentation for any purpose and without
      9      1.1  jonathan  * fee is hereby granted, provided that the above copyright
     10      1.1  jonathan  * notice appear in all copies.  Stanford University
     11      1.1  jonathan  * makes no representations about the suitability of this
     12      1.1  jonathan  * software for any purpose.  It is provided "as is" without
     13      1.1  jonathan  * express or implied warranty.
     14      1.1  jonathan  *
     15      1.1  jonathan  */
     16      1.1  jonathan 
     17      1.1  jonathan #include <sys/param.h>
     18      1.1  jonathan #include <sys/systm.h>
     19      1.1  jonathan #include <sys/types.h>
     20      1.1  jonathan #include <sys/device.h>
     21      1.1  jonathan #include <dev/tc/tcvar.h>
     22      1.1  jonathan #include <machine/autoconf.h>
     23      1.1  jonathan #include <dev/tc/ioasicvar.h>
     24      1.1  jonathan 
     25      1.1  jonathan #include <pmax/dev/device.h>	/* XXX */
     26      1.1  jonathan #include <pmax/dev/scsi.h>	/* XXX */
     27      1.1  jonathan 
     28      1.1  jonathan #include <pmax/dev/ascreg.h>	/* XXX */
     29      1.1  jonathan #include <dev/tc/ascvar.h>
     30      1.1  jonathan 
     31      1.1  jonathan /*XXX*/
     32      1.1  jonathan 
     33      1.1  jonathan 
     34      1.1  jonathan /*
     35      1.1  jonathan  * Autoconfiguration data for config.
     36      1.1  jonathan  */
     37      1.6  jonathan int asc_tc_match __P((struct device *, struct cfdata *, void *));
     38      1.1  jonathan void asc_tc_attach __P((struct device *, struct device *, void *));
     39      1.1  jonathan 
     40      1.1  jonathan struct cfattach asc_tc_ca = {
     41      1.1  jonathan 	sizeof(struct asc_softc), asc_tc_match, asc_tc_attach
     42      1.1  jonathan };
     43      1.1  jonathan 
     44      1.1  jonathan /*
     45      1.1  jonathan  * DMA callbacks
     46      1.1  jonathan  */
     47      1.1  jonathan 
     48      1.7    mhitch static int
     49      1.1  jonathan tc_dma_start __P((struct asc_softc *asc, struct scsi_state *state,
     50      1.7    mhitch 		  caddr_t cp, int flag, int len, int off));
     51      1.1  jonathan 
     52      1.1  jonathan static void
     53      1.1  jonathan tc_dma_end __P((struct asc_softc *asc, struct scsi_state *state,
     54      1.1  jonathan 		int flag));
     55      1.1  jonathan 
     56      1.1  jonathan 
     57      1.1  jonathan int
     58      1.1  jonathan asc_tc_match(parent, match, aux)
     59      1.1  jonathan 	struct device *parent;
     60      1.6  jonathan 	struct cfdata *match;
     61      1.1  jonathan 	void *aux;
     62      1.1  jonathan {
     63      1.1  jonathan 	struct tc_attach_args *t = aux;
     64      1.1  jonathan 	void *ascaddr;
     65      1.1  jonathan 
     66      1.1  jonathan 	if (strncmp(t->ta_modname, "PMAZ-AA ", TC_ROM_LLEN))
     67      1.1  jonathan 		return (0);
     68      1.1  jonathan 
     69      1.1  jonathan 	ascaddr = (void*)t->ta_addr;
     70      1.1  jonathan 
     71      1.1  jonathan 	if (tc_badaddr(ascaddr + ASC_OFFSET_53C94))
     72      1.1  jonathan 		return (0);
     73      1.1  jonathan 
     74      1.1  jonathan 	return (1);
     75      1.1  jonathan }
     76      1.1  jonathan 
     77      1.1  jonathan 
     78      1.1  jonathan 
     79      1.1  jonathan void
     80      1.1  jonathan asc_tc_attach(parent, self, aux)
     81      1.1  jonathan 	struct device *parent;
     82      1.1  jonathan 	struct device *self;
     83      1.1  jonathan 	void *aux;
     84      1.1  jonathan {
     85      1.1  jonathan 	register struct tc_attach_args *t = aux;
     86      1.1  jonathan 	register asc_softc_t asc = (asc_softc_t) self;
     87      1.7    mhitch 	u_char *buff;
     88      1.7    mhitch 	int i, speed;
     89      1.1  jonathan 
     90      1.1  jonathan 	void *ascaddr;
     91      1.1  jonathan 	int unit;
     92      1.1  jonathan 
     93      1.5  jonathan 	/* Use uncached address for chip registers.  */
     94      1.5  jonathan 	ascaddr = (void*)MIPS_PHYS_TO_KSEG1(t->ta_addr);
     95      1.1  jonathan 	unit = asc->sc_dev.dv_unit;
     96      1.1  jonathan 
     97      1.1  jonathan 	/*
     98      1.1  jonathan 	 * Initialize hw descriptor, cache some pointers
     99      1.1  jonathan 	 */
    100      1.1  jonathan 	asc->regs = (asc_regmap_t *)(ascaddr + ASC_OFFSET_53C94);
    101      1.1  jonathan 
    102      1.1  jonathan 	/*
    103      1.1  jonathan 	 * Set up machine dependencies.
    104      1.1  jonathan 	 * (1) how to do dma
    105      1.1  jonathan 	 * (2) timing based on turbochannel frequency
    106      1.1  jonathan 	 */
    107      1.1  jonathan 
    108      1.1  jonathan 	/*
    109      1.1  jonathan 	 * Fall through for turbochannel option.
    110      1.1  jonathan 	 */
    111      1.1  jonathan 	asc->dmar = (volatile int *)(ascaddr + ASC_OFFSET_DMAR);
    112      1.7    mhitch 	buff = (u_char *)(ascaddr + ASC_OFFSET_RAM);
    113      1.7    mhitch 
    114      1.7    mhitch 	/*
    115      1.7    mhitch 	 * Statically partition the DMA buffer between targets.
    116      1.7    mhitch 	 * This way we will eventually be able to attach/detach
    117      1.7    mhitch 	 * drives on-fly.  And 18k/target is plenty for normal use.
    118      1.7    mhitch 	 */
    119      1.7    mhitch 
    120      1.7    mhitch 	/*
    121      1.7    mhitch 	 * Give each target its own DMA buffer region.
    122      1.7    mhitch 	 * We may want to try ping ponging buffers later.
    123      1.7    mhitch 	 */
    124      1.7    mhitch 	for (i = 0; i < ASC_NCMD; i++)
    125      1.7    mhitch 		asc->st[i].dmaBufAddr = buff + PER_TGT_DMA_SIZE * i;
    126      1.7    mhitch 
    127      1.1  jonathan 	asc->dma_start = tc_dma_start;
    128      1.1  jonathan 	asc->dma_end = tc_dma_end;
    129      1.1  jonathan 
    130      1.1  jonathan 	/*
    131      1.1  jonathan 	 * Now for timing. The 3max has a 25Mhz tb whereas the 3min and
    132      1.1  jonathan 	 * maxine are 12.5Mhz.
    133      1.1  jonathan 	 */
    134  1.7.6.1    mellon 	printf(" (bus speed: %s MHz) ", t->ta_busspeed? "25"  : "12.5");
    135      1.1  jonathan 
    136      1.1  jonathan 	switch (t->ta_busspeed) {
    137      1.1  jonathan 	case TC_SPEED_25_MHZ:
    138      1.1  jonathan 		speed = ASC_SPEED_25_MHZ;
    139      1.1  jonathan 		break;
    140      1.1  jonathan 
    141      1.1  jonathan 	default:
    142      1.4  christos 		printf(" (unknown TC speed, assuming 12.5MHz) ");
    143      1.1  jonathan 		/* FALLTHROUGH*/
    144      1.1  jonathan 	case TC_SPEED_12_5_MHZ:
    145      1.1  jonathan 		speed = ASC_SPEED_12_5_MHZ;
    146      1.1  jonathan 		break;
    147      1.1  jonathan 	};
    148      1.1  jonathan 
    149      1.7    mhitch 	ascattach(asc, speed);
    150      1.1  jonathan 
    151      1.1  jonathan 	/* tie pseudo-slot to device */
    152      1.1  jonathan 	tc_intr_establish(parent, t->ta_cookie, TC_IPL_BIO,
    153      1.1  jonathan 			  asc_intr, asc);
    154      1.1  jonathan }
    155      1.1  jonathan 
    156      1.1  jonathan 
    157      1.1  jonathan /*
    158      1.1  jonathan  * DMA handling routines. For a turbochannel device, just set the dmar.
    159      1.1  jonathan  * For the I/O ASIC, handle the actual DMA interface.
    160      1.1  jonathan  */
    161      1.7    mhitch static int
    162      1.7    mhitch tc_dma_start(asc, state, cp, flag, len, off)
    163      1.1  jonathan 	asc_softc_t asc;
    164      1.1  jonathan 	State *state;
    165      1.1  jonathan 	caddr_t cp;
    166      1.1  jonathan 	int flag;
    167      1.7    mhitch 	int len;
    168      1.7    mhitch 	int off;
    169      1.1  jonathan {
    170      1.1  jonathan 
    171      1.7    mhitch 	if (len > PER_TGT_DMA_SIZE)
    172      1.7    mhitch 		len = PER_TGT_DMA_SIZE;
    173      1.1  jonathan 	if (flag == ASCDMA_WRITE)
    174      1.7    mhitch 		bcopy(cp, state->dmaBufAddr + off, len);
    175      1.7    mhitch 	if (flag == ASCDMA_WRITE)
    176      1.7    mhitch 		*asc->dmar = ASC_DMAR_WRITE | ASC_DMA_ADDR(state->dmaBufAddr + off);
    177      1.1  jonathan 	else
    178      1.7    mhitch 		*asc->dmar = ASC_DMA_ADDR(state->dmaBufAddr + off);
    179      1.7    mhitch 	return (len);
    180      1.1  jonathan }
    181      1.1  jonathan 
    182      1.1  jonathan static void
    183      1.1  jonathan tc_dma_end(asc, state, flag)
    184      1.1  jonathan 	asc_softc_t asc;
    185      1.1  jonathan 	State *state;
    186      1.1  jonathan 	int flag;
    187      1.1  jonathan {
    188      1.7    mhitch 	if (flag == ASCDMA_READ)
    189      1.7    mhitch 		bcopy(state->dmaBufAddr, state->buf, state->dmalen);
    190      1.1  jonathan }
    191