xref: /src/sys/dev/tc/asc_tc.c

/* $NetBSD: asc_tc.c,v 1.34 2008/04/28 20:23:58 martin Exp $ */

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Tohru Nishimura.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: asc_tc.c,v 1.34 2008/04/28 20:23:58 martin Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/buf.h>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <dev/scsipi/scsi_message.h>

#include <sys/bus.h>

#include <dev/ic/ncr53c9xreg.h>
#include <dev/ic/ncr53c9xvar.h>

#include <dev/tc/tcvar.h>

struct asc_softc {
	struct ncr53c9x_softc sc_ncr53c9x;	/* glue to MI code */
	bus_space_tag_t sc_bst;
	bus_space_handle_t sc_bsh;
	bus_dma_tag_t sc_dmat;
	bus_dmamap_t sc_dmamap;
	uint8_t **sc_dmaaddr;
	size_t	*sc_dmalen;
	size_t	sc_dmasize;
	int	sc_active;			/* DMA active ? */
	int	sc_ispullup;			/* DMA into main memory? */

	/* XXX XXX XXX */
	char *sc_base, *sc_bounce, *sc_target;
};

static int  asc_tc_match(device_t, cfdata_t, void *);
static void asc_tc_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(asc_tc, sizeof(struct asc_softc),
    asc_tc_match, asc_tc_attach, NULL, NULL);

static uint8_t	asc_read_reg(struct ncr53c9x_softc *, int);
static void	asc_write_reg(struct ncr53c9x_softc *, int, uint8_t);
static int	asc_dma_isintr(struct ncr53c9x_softc *);
static void	asc_tc_reset(struct ncr53c9x_softc *);
static int	asc_tc_intr(struct ncr53c9x_softc *);
static int	asc_tc_setup(struct ncr53c9x_softc *, uint8_t **,
		    size_t *, int, size_t *);
static void	asc_tc_go(struct ncr53c9x_softc *);
static void	asc_tc_stop(struct ncr53c9x_softc *);
static int	asc_dma_isactive(struct ncr53c9x_softc *);

static struct ncr53c9x_glue asc_tc_glue = {
	asc_read_reg,
	asc_write_reg,
	asc_dma_isintr,
	asc_tc_reset,
	asc_tc_intr,
	asc_tc_setup,
	asc_tc_go,
	asc_tc_stop,
	asc_dma_isactive,
	NULL,
};

/*
 * Parameters specific to PMAZ-A TC option card.
 */
#define PMAZ_OFFSET_53C94	0x0		/* from module base */
#define PMAZ_OFFSET_DMAR	0x40000		/* DMA Address Register */
#define PMAZ_OFFSET_RAM		0x80000		/* 128KB SRAM buffer */
#define PMAZ_OFFSET_ROM		0xc0000		/* diagnostic ROM */

#define PMAZ_RAM_SIZE		0x20000		/* 128k (32k*32) */
#define PER_TGT_DMA_SIZE	((PMAZ_RAM_SIZE / 7) & ~(sizeof(int) - 1))

#define PMAZ_DMAR_WRITE		0x80000000	/* DMA direction bit */
#define PMAZ_DMAR_MASK		0x1ffff		/* 17 bits, 128k */
#define PMAZ_DMA_ADDR(x)	((unsigned long)(x) & PMAZ_DMAR_MASK)

static int
asc_tc_match(device_t parent, cfdata_t cfdata, void *aux)
{
	struct tc_attach_args *d = aux;

	if (strncmp("PMAZ-AA ", d->ta_modname, TC_ROM_LLEN))
		return 0;

	return 1;
}

static void
asc_tc_attach(device_t parent, device_t self, void *aux)
{
	struct asc_softc *asc = device_private(self);
	struct ncr53c9x_softc *sc = &asc->sc_ncr53c9x;
	struct tc_attach_args *ta = aux;

	/*
	 * Set up glue for MI code early; we use some of it here.
	 */
	sc->sc_dev = self;
	sc->sc_glue = &asc_tc_glue;
	asc->sc_bst = ta->ta_memt;
	asc->sc_dmat = ta->ta_dmat;
	if (bus_space_map(asc->sc_bst, ta->ta_addr,
	    PMAZ_OFFSET_RAM + PMAZ_RAM_SIZE, 0, &asc->sc_bsh)) {
		aprint_error(": unable to map device\n");
		return;
	}
	asc->sc_base = (void *)ta->ta_addr;	/* XXX XXX XXX */

	tc_intr_establish(parent, ta->ta_cookie, IPL_BIO, ncr53c9x_intr, sc);

	sc->sc_id = 7;
	sc->sc_freq = (ta->ta_busspeed) ? 25000000 : 12500000;

	/* gimme MHz */
	sc->sc_freq /= 1000000;

	/*
	 * XXX More of this should be in ncr53c9x_attach(), but
	 * XXX should we really poke around the chip that much in
	 * XXX the MI code?  Think about this more...
	 */

	/*
	 * Set up static configuration info.
	 */
	sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB;
	sc->sc_cfg2 = NCRCFG2_SCSI2;
	sc->sc_cfg3 = 0;
	sc->sc_rev = NCR_VARIANT_NCR53C94;

	/*
	 * XXX minsync and maxxfer _should_ be set up in MI code,
	 * XXX but it appears to have some dependency on what sort
	 * XXX of DMA we're hooked up to, etc.
	 */

	/*
	 * This is the value used to start sync negotiations
	 * Note that the NCR register "SYNCTP" is programmed
	 * in "clocks per byte", and has a minimum value of 4.
	 * The SCSI period used in negotiation is one-fourth
	 * of the time (in nanoseconds) needed to transfer one byte.
	 * Since the chip's clock is given in MHz, we have the following
	 * formula: 4 * period = (1000 / freq) * 4
	 */
	sc->sc_minsync = (1000 / sc->sc_freq) * 5 / 4;

	sc->sc_maxxfer = 64 * 1024;

	/* Do the common parts of attachment. */
	sc->sc_adapter.adapt_minphys = minphys;
	sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request;
	ncr53c9x_attach(sc);
}

static void
asc_tc_reset(struct ncr53c9x_softc *sc)
{
	struct asc_softc *asc = (struct asc_softc *)sc;

	asc->sc_active = 0;
}

static int
asc_tc_intr(struct ncr53c9x_softc *sc)
{
	struct asc_softc *asc = (struct asc_softc *)sc;
	int trans, resid;

	resid = 0;
	if (!asc->sc_ispullup &&
	    (resid = (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF)) != 0) {
		NCR_DMA(("asc_tc_intr: empty FIFO of %d ", resid));
		DELAY(1);
	}

	resid += NCR_READ_REG(sc, NCR_TCL);
	resid += NCR_READ_REG(sc, NCR_TCM) << 8;

	trans = asc->sc_dmasize - resid;

	if (asc->sc_ispullup)
		memcpy(asc->sc_target, asc->sc_bounce, trans);
	*asc->sc_dmalen -= trans;
	*asc->sc_dmaaddr += trans;
	asc->sc_active = 0;

	return 0;
}

static int
asc_tc_setup(struct ncr53c9x_softc *sc, uint8_t **addr, size_t *len,
    int datain, size_t *dmasize)
{
	struct asc_softc *asc = (struct asc_softc *)sc;
	uint32_t tc_dmar;
	size_t size;

	asc->sc_dmaaddr = addr;
	asc->sc_dmalen = len;
	asc->sc_ispullup = datain;

	NCR_DMA(("asc_tc_setup: start %ld@%p, %s\n", (long)*asc->sc_dmalen,
	    *asc->sc_dmaaddr, datain ? "IN" : "OUT"));

	size = *dmasize;
	if (size > PER_TGT_DMA_SIZE)
		size = PER_TGT_DMA_SIZE;
	*dmasize = asc->sc_dmasize = size;

	NCR_DMA(("asc_tc_setup: dmasize = %ld\n", (long)asc->sc_dmasize));

	asc->sc_bounce = asc->sc_base + PMAZ_OFFSET_RAM;
	asc->sc_bounce += PER_TGT_DMA_SIZE *
	    sc->sc_nexus->xs->xs_periph->periph_target;
	asc->sc_target = *addr;

	if (!asc->sc_ispullup)
		memcpy(asc->sc_bounce, asc->sc_target, size);

#if 1
	if (asc->sc_ispullup)
		tc_dmar = PMAZ_DMA_ADDR(asc->sc_bounce);
	else
		tc_dmar = PMAZ_DMAR_WRITE | PMAZ_DMA_ADDR(asc->sc_bounce);
	bus_space_write_4(asc->sc_bst, asc->sc_bsh, PMAZ_OFFSET_DMAR, tc_dmar);
	asc->sc_active = 1;
#endif
	return 0;
}

static void
asc_tc_go(struct ncr53c9x_softc *sc)
{
#if 0
	struct asc_softc *asc = (struct asc_softc *)sc;
	uint32_t tc_dmar;

	if (asc->sc_ispullup)
		tc_dmar = PMAZ_DMA_ADDR(asc->sc_bounce);
	else
		tc_dmar = PMAZ_DMAR_WRITE | PMAZ_DMA_ADDR(asc->sc_bounce);
	bus_space_write_4(asc->sc_bst, asc->sc_bsh, PMAZ_OFFSET_DMAR, tc_dmar);
	asc->sc_active = 1;
#endif
}

/* NEVER CALLED BY MI 53C9x ENGINE INDEED */
static void
asc_tc_stop(struct ncr53c9x_softc *sc)
{
#if 0
	struct asc_softc *asc = (struct asc_softc *)sc;

	if (asc->sc_ispullup)
		memcpy(asc->sc_target, asc->sc_bounce, asc->sc_dmasize);
	asc->sc_active = 0;
#endif
}

/*
 * Glue functions.
 */
static uint8_t
asc_read_reg(struct ncr53c9x_softc *sc, int reg)
{
	struct asc_softc *asc = (struct asc_softc *)sc;

	return bus_space_read_4(asc->sc_bst, asc->sc_bsh,
	    reg * sizeof(uint32_t)) & 0xff;
}

static void
asc_write_reg(struct ncr53c9x_softc *sc, int reg, uint8_t val)
{
	struct asc_softc *asc = (struct asc_softc *)sc;

	bus_space_write_4(asc->sc_bst, asc->sc_bsh,
	    reg * sizeof(uint32_t), val);
}

static int
asc_dma_isintr(struct ncr53c9x_softc *sc)
{

	return (NCR_READ_REG(sc, NCR_STAT) & NCRSTAT_INT) != 0;
}

static int
asc_dma_isactive(struct ncr53c9x_softc *sc)
{
	struct asc_softc *asc = (struct asc_softc *)sc;

	return asc->sc_active;
}