NetBSD/sys/arch/sun3/dev/esp.c

350 lines
9.1 KiB
C

/* $NetBSD: esp.c,v 1.14 2001/04/25 17:53:24 bouyer Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jeremy Cooper and Gordon W. Ross
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*/
/*
* "Front end" glue for the ncr53c9x chip, formerly known as the
* Emulex SCSI Processor (ESP) which is what we actually have.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.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 <machine/autoconf.h>
#include <dev/ic/ncr53c9xreg.h>
#include <dev/ic/ncr53c9xvar.h>
#include <sun3/dev/dmareg.h>
#include <sun3/dev/dmavar.h>
#define ESP_REG_SIZE (12*4)
struct esp_softc {
struct ncr53c9x_softc sc_ncr53c9x; /* glue to MI code */
volatile u_char *sc_reg; /* the registers */
struct dma_softc *sc_dma; /* pointer to my dma */
};
static int espmatch __P((struct device *, struct cfdata *, void *));
static void espattach __P((struct device *, struct device *, void *));
struct cfattach esp_ca = {
sizeof(struct esp_softc), espmatch, espattach
};
/*
* Functions and the switch for the MI code.
*/
static u_char esp_read_reg __P((struct ncr53c9x_softc *, int));
static void esp_write_reg __P((struct ncr53c9x_softc *, int, u_char));
static int esp_dma_isintr __P((struct ncr53c9x_softc *));
static void esp_dma_reset __P((struct ncr53c9x_softc *));
static int esp_dma_intr __P((struct ncr53c9x_softc *));
static int esp_dma_setup __P((struct ncr53c9x_softc *, caddr_t *,
size_t *, int, size_t *));
static void esp_dma_go __P((struct ncr53c9x_softc *));
static void esp_dma_stop __P((struct ncr53c9x_softc *));
static int esp_dma_isactive __P((struct ncr53c9x_softc *));
static struct ncr53c9x_glue esp_glue = {
esp_read_reg,
esp_write_reg,
esp_dma_isintr,
esp_dma_reset,
esp_dma_intr,
esp_dma_setup,
esp_dma_go,
esp_dma_stop,
esp_dma_isactive,
NULL, /* gl_clear_latched_intr */
};
static int
espmatch(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux;
{
struct confargs *ca = aux;
/*
* Check for the esp registers.
*/
if (bus_peek(ca->ca_bustype,
ca->ca_paddr + (NCR_STAT * 4), 1) == -1)
return (0);
/* If default ipl, fill it in. */
if (ca->ca_intpri == -1)
ca->ca_intpri = 2;
return (1);
}
static void
espattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct confargs *ca = aux;
struct esp_softc *esc = (void *)self;
struct ncr53c9x_softc *sc = &esc->sc_ncr53c9x;
/*
* Set up glue for MI code early; we use some of it here.
*/
sc->sc_glue = &esp_glue;
/*
* Map in the ESP registers.
*/
esc->sc_reg =
bus_mapin(ca->ca_bustype, ca->ca_paddr, ESP_REG_SIZE);
/* Other settings */
sc->sc_id = 7;
sc->sc_freq = 20; /* The 3/80 esp runs at 20 Mhz */
/*
* Hook up the DMA driver.
*/
esc->sc_dma = espdmafind(sc->sc_dev.dv_unit);
esc->sc_dma->sc_esp = sc; /* Point back to us */
/*
* 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...
*/
/*
* It is necessary to try to load the 2nd config register here,
* to find out what rev the esp chip is, else the ncr53c9x_reset
* will not set up the defaults correctly.
*/
sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB;
sc->sc_cfg2 = NCRCFG2_SCSI2 | NCRCFG2_RPE;
sc->sc_cfg3 = NCRCFG3_CDB;
NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2);
if ((NCR_READ_REG(sc, NCR_CFG2) & ~NCRCFG2_RSVD) !=
(NCRCFG2_SCSI2 | NCRCFG2_RPE)) {
sc->sc_rev = NCR_VARIANT_ESP100;
} else {
sc->sc_cfg2 = NCRCFG2_SCSI2;
NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2);
sc->sc_cfg3 = 0;
NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3);
sc->sc_cfg3 = (NCRCFG3_CDB | NCRCFG3_FCLK);
NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3);
if (NCR_READ_REG(sc, NCR_CFG3) !=
(NCRCFG3_CDB | NCRCFG3_FCLK)) {
sc->sc_rev = NCR_VARIANT_ESP100A;
} else {
/* NCRCFG2_FE enables > 64K transfers */
sc->sc_cfg2 |= NCRCFG2_FE;
sc->sc_cfg3 = 0;
NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3);
sc->sc_rev = NCR_VARIANT_ESP200;
}
}
/*
* 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;
/*
* Alas, we must now modify the value a bit, because it's
* only valid when can switch on FASTCLK and FASTSCSI bits
* in config register 3...
*/
switch (sc->sc_rev) {
case NCR_VARIANT_ESP100:
sc->sc_maxxfer = 64 * 1024;
sc->sc_minsync = 0; /* No synch on old chip? */
break;
case NCR_VARIANT_ESP100A:
sc->sc_maxxfer = 64 * 1024;
/* Min clocks/byte is 5 */
sc->sc_minsync = ncr53c9x_cpb2stp(sc, 5);
break;
case NCR_VARIANT_ESP200:
sc->sc_maxxfer = 16 * 1024 * 1024;
/* XXX - do actually set FAST* bits */
break;
}
/* and the interuppts */
isr_add_autovect(ncr53c9x_intr, sc, ca->ca_intpri);
evcnt_attach_dynamic(&sc->sc_intrcnt, EVCNT_TYPE_INTR, NULL,
sc->sc_dev.dv_xname, "intr");
/* Do the common parts of attachment. */
sc->sc_adapter.adapt_minphys = minphys;
sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request;
ncr53c9x_attach(sc);
#if 0
/* XXX - This doesn't work yet. Not sure why... */
/* Turn on target selection using the `dma' method */
sc->sc_features |= NCR_F_DMASELECT; /* XXX - OK? */
#endif
}
/*
* Glue functions.
*/
u_char
esp_read_reg(sc, reg)
struct ncr53c9x_softc *sc;
int reg;
{
struct esp_softc *esc = (struct esp_softc *)sc;
return (esc->sc_reg[reg * 4]);
}
void
esp_write_reg(sc, reg, val)
struct ncr53c9x_softc *sc;
int reg;
u_char val;
{
struct esp_softc *esc = (struct esp_softc *)sc;
esc->sc_reg[reg * 4] = val;
}
int
esp_dma_isintr(sc)
struct ncr53c9x_softc *sc;
{
struct esp_softc *esc = (struct esp_softc *)sc;
u_int32_t csr;
csr = DMACSR(esc->sc_dma);
return (csr & (D_INT_PEND|D_ERR_PEND));
}
void
esp_dma_reset(sc)
struct ncr53c9x_softc *sc;
{
struct esp_softc *esc = (struct esp_softc *)sc;
dma_reset(esc->sc_dma);
}
int
esp_dma_intr(sc)
struct ncr53c9x_softc *sc;
{
struct esp_softc *esc = (struct esp_softc *)sc;
return (espdmaintr(esc->sc_dma));
}
int
esp_dma_setup(sc, addr, len, datain, dmasize)
struct ncr53c9x_softc *sc;
caddr_t *addr;
size_t *len;
int datain;
size_t *dmasize;
{
struct esp_softc *esc = (struct esp_softc *)sc;
return (dma_setup(esc->sc_dma, addr, len, datain, dmasize));
}
void
esp_dma_go(sc)
struct ncr53c9x_softc *sc;
{
struct esp_softc *esc = (struct esp_softc *)sc;
/* Start DMA */
DMACSR(esc->sc_dma) |= D_EN_DMA;
esc->sc_dma->sc_active = 1;
}
void
esp_dma_stop(sc)
struct ncr53c9x_softc *sc;
{
struct esp_softc *esc = (struct esp_softc *)sc;
DMACSR(esc->sc_dma) &= ~D_EN_DMA;
}
int
esp_dma_isactive(sc)
struct ncr53c9x_softc *sc;
{
struct esp_softc *esc = (struct esp_softc *)sc;
return (esc->sc_dma->sc_active);
}