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

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2002-10-09 01:29:46 +04:00
/* $NetBSD: si_vme.c,v 1.20 2002/10/08 21:29:46 jdolecek Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Glass, David Jones, 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.
*/
/*
* This file contains only the machine-dependent parts of the
* Sun3 SCSI driver. (Autoconfig stuff and DMA functions.)
* The machine-independent parts are in ncr5380sbc.c
*
* Supported hardware includes:
* Sun SCSI-3 on OBIO (Sun3/50,Sun3/60)
* Sun SCSI-3 on VME (Sun3/160,Sun3/260)
*
* Could be made to support the Sun3/E if someone wanted to.
*
* Note: Both supported variants of the Sun SCSI-3 adapter have
* some really unusual "features" for this driver to deal with,
* generally related to the DMA engine. The OBIO variant will
* ignore any attempt to write the FIFO count register while the
* SCSI bus is in DATA_IN or DATA_OUT phase. This is dealt with
* by setting the FIFO count early in COMMAND or MSG_IN phase.
*
* The VME variant has a bit to enable or disable the DMA engine,
* but that bit also gates the interrupt line from the NCR5380!
* Therefore, in order to get any interrupt from the 5380, (i.e.
* for reselect) one must clear the DMA engine transfer count and
* then enable DMA. This has the further complication that you
* CAN NOT touch the NCR5380 while the DMA enable bit is set, so
* we have to turn DMA back off before we even look at the 5380.
*
* What wonderfully whacky hardware this is!
*
* Credits, history:
*
* David Jones wrote the initial version of this module, which
* included support for the VME adapter only. (no reselection).
*
* Gordon Ross added support for the OBIO adapter, and re-worked
* both the VME and OBIO code to support disconnect/reselect.
* (Required figuring out the hardware "features" noted above.)
*
* The autoconfiguration boilerplate came from Adam Glass.
*/
/*****************************************************************
* VME functions for DMA
****************************************************************/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsipi_debug.h>
#include <dev/scsipi/scsiconf.h>
#include <machine/autoconf.h>
#include <machine/dvma.h>
/* #define DEBUG XXX */
#include <dev/ic/ncr5380reg.h>
#include <dev/ic/ncr5380var.h>
#include "sireg.h"
#include "sivar.h"
void si_vme_dma_setup __P((struct ncr5380_softc *));
void si_vme_dma_start __P((struct ncr5380_softc *));
void si_vme_dma_eop __P((struct ncr5380_softc *));
void si_vme_dma_stop __P((struct ncr5380_softc *));
void si_vme_intr_on __P((struct ncr5380_softc *));
void si_vme_intr_off __P((struct ncr5380_softc *));
static void si_vme_reset __P((struct ncr5380_softc *));
/*
* New-style autoconfig attachment
*/
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static int si_vme_match __P((struct device *, struct cfdata *, void *));
static void si_vme_attach __P((struct device *, struct device *, void *));
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CFATTACH_DECL(si_vme, sizeof(struct si_softc),
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si_vme_match, si_vme_attach, NULL, NULL);
/*
* Options for disconnect/reselect, DMA, and interrupts.
* By default, allow disconnect/reselect on targets 4-6.
* Those are normally tapes that really need it enabled.
*/
int si_vme_options = 0x0f;
static int
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si_vme_match(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux;
{
struct confargs *ca = aux;
int probe_addr;
/* No default VME address. */
if (ca->ca_paddr == -1)
return (0);
/* Make sure something is there... */
probe_addr = ca->ca_paddr + 1;
if (bus_peek(ca->ca_bustype, probe_addr, 1) == -1)
return (0);
/*
* If this is a VME SCSI board, we have to determine whether
* it is an "sc" (Sun2) or "si" (Sun3) SCSI board. This can
* be determined using the fact that the "sc" board occupies
* 4K bytes in VME space but the "si" board occupies 2K bytes.
*/
/* Note: the "si" board should NOT respond here. */
probe_addr = ca->ca_paddr + 0x801;
if (bus_peek(ca->ca_bustype, probe_addr, 1) != -1) {
/* Something responded at 2K+1. Maybe an "sc" board? */
#ifdef DEBUG
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printf("si_vme_match: May be an `sc' board at pa=0x%x\n",
ca->ca_paddr);
#endif
return(0);
}
/* Default interrupt priority. */
if (ca->ca_intpri == -1)
ca->ca_intpri = 2;
return (1);
}
static void
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si_vme_attach(parent, self, args)
struct device *parent, *self;
void *args;
{
struct si_softc *sc = (struct si_softc *) self;
struct ncr5380_softc *ncr_sc = &sc->ncr_sc;
struct cfdata *cf = self->dv_cfdata;
struct confargs *ca = args;
/* Get options from config flags if specified. */
if (cf->cf_flags)
sc->sc_options = cf->cf_flags;
else
sc->sc_options = si_vme_options;
printf(": options=0x%x\n", sc->sc_options);
sc->sc_adapter_type = ca->ca_bustype;
sc->sc_regs = (struct si_regs *)
bus_mapin(ca->ca_bustype, ca->ca_paddr,
sizeof(struct si_regs));
sc->sc_adapter_iv_am =
VME_SUPV_DATA_24 | (ca->ca_intvec & 0xFF);
/*
* MD function pointers used by the MI code.
*/
ncr_sc->sc_pio_out = ncr5380_pio_out;
ncr_sc->sc_pio_in = ncr5380_pio_in;
ncr_sc->sc_dma_alloc = si_dma_alloc;
ncr_sc->sc_dma_free = si_dma_free;
ncr_sc->sc_dma_setup = si_vme_dma_setup;
ncr_sc->sc_dma_start = si_vme_dma_start;
ncr_sc->sc_dma_poll = si_dma_poll;
ncr_sc->sc_dma_eop = si_vme_dma_eop;
ncr_sc->sc_dma_stop = si_vme_dma_stop;
ncr_sc->sc_intr_on = si_vme_intr_on;
ncr_sc->sc_intr_off = si_vme_intr_off;
/* Attach interrupt handler. */
isr_add_vectored(si_intr, (void *)sc,
ca->ca_intpri, ca->ca_intvec);
/* Reset the hardware. */
si_vme_reset(ncr_sc);
/* Do the common attach stuff. */
si_attach(sc);
}
static void
si_vme_reset(struct ncr5380_softc *ncr_sc)
{
struct si_softc *sc = (struct si_softc *)ncr_sc;
volatile struct si_regs *si = sc->sc_regs;
#ifdef DEBUG
if (si_debug) {
printf("si_vme_reset\n");
}
#endif
/*
* The SCSI3 controller has an 8K FIFO to buffer data between the
* 5380 and the DMA. Make sure it starts out empty.
*
* The reset bits in the CSR are active low.
*/
si->si_csr = 0;
delay(10);
si->si_csr = SI_CSR_FIFO_RES | SI_CSR_SCSI_RES | SI_CSR_INTR_EN;
delay(10);
si->fifo_count = 0;
/* Make sure the DMA engine is stopped. */
si->dma_addrh = 0;
si->dma_addrl = 0;
si->dma_counth = 0;
si->dma_countl = 0;
si->si_iv_am = sc->sc_adapter_iv_am;
si->fifo_cnt_hi = 0;
}
/*
* This is called when the bus is going idle,
* so we want to enable the SBC interrupts.
* That is controlled by the DMA enable!
* Who would have guessed!
* What a NASTY trick!
*/
void
si_vme_intr_on(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
struct si_softc *sc = (struct si_softc *)ncr_sc;
volatile struct si_regs *si = sc->sc_regs;
/* receive mode should be safer */
si->si_csr &= ~SI_CSR_SEND;
/* Clear the count so nothing happens. */
si->dma_counth = 0;
si->dma_countl = 0;
/* Clear the start address too. (paranoid?) */
si->dma_addrh = 0;
si->dma_addrl = 0;
/* Finally, enable the DMA engine. */
si->si_csr |= SI_CSR_DMA_EN;
}
/*
* This is called when the bus is idle and we are
* about to start playing with the SBC chip.
*/
void
si_vme_intr_off(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
struct si_softc *sc = (struct si_softc *)ncr_sc;
volatile struct si_regs *si = sc->sc_regs;
si->si_csr &= ~SI_CSR_DMA_EN;
}
/*
* This function is called during the COMMAND or MSG_IN phase
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* that precedes a DATA_IN or DATA_OUT phase, in case we need
* to setup the DMA engine before the bus enters a DATA phase.
*
* XXX: The VME adapter appears to suppress SBC interrupts
* when the FIFO is not empty or the FIFO count is non-zero!
*
* On the VME version, setup the start addres, but clear the
* count (to make sure it stays idle) and set that later.
*/
void
si_vme_dma_setup(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
struct si_softc *sc = (struct si_softc *)ncr_sc;
struct sci_req *sr = ncr_sc->sc_current;
struct si_dma_handle *dh = sr->sr_dma_hand;
volatile struct si_regs *si = sc->sc_regs;
long data_pa;
int xlen;
/*
* Get the DVMA mapping for this segment.
* XXX - Should separate allocation and mapin.
*/
data_pa = dvma_kvtopa(dh->dh_dvma, sc->sc_adapter_type);
data_pa += (ncr_sc->sc_dataptr - dh->dh_addr);
if (data_pa & 1)
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panic("si_dma_start: bad pa=0x%lx", data_pa);
xlen = ncr_sc->sc_datalen;
xlen &= ~1; /* XXX: necessary? */
sc->sc_reqlen = xlen; /* XXX: or less? */
#ifdef DEBUG
if (si_debug & 2) {
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printf("si_dma_setup: dh=%p, pa=0x%lx, xlen=0x%x\n",
dh, data_pa, xlen);
}
#endif
/* Set direction (send/recv) */
if (dh->dh_flags & SIDH_OUT) {
si->si_csr |= SI_CSR_SEND;
} else {
si->si_csr &= ~SI_CSR_SEND;
}
/* Reset the FIFO. */
si->si_csr &= ~SI_CSR_FIFO_RES; /* active low */
si->si_csr |= SI_CSR_FIFO_RES;
if (data_pa & 2) {
si->si_csr |= SI_CSR_BPCON;
} else {
si->si_csr &= ~SI_CSR_BPCON;
}
/* Load the start address. */
si->dma_addrh = (ushort)(data_pa >> 16);
si->dma_addrl = (ushort)(data_pa & 0xFFFF);
/*
* Keep the count zero or it may start early!
*/
si->dma_counth = 0;
si->dma_countl = 0;
#if 0
/* Clear FIFO counter. (also hits dma_count) */
si->fifo_cnt_hi = 0;
si->fifo_count = 0;
#endif
}
void
si_vme_dma_start(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
struct si_softc *sc = (struct si_softc *)ncr_sc;
struct sci_req *sr = ncr_sc->sc_current;
struct si_dma_handle *dh = sr->sr_dma_hand;
volatile struct si_regs *si = sc->sc_regs;
int s, xlen;
xlen = sc->sc_reqlen;
/* This MAY be time critical (not sure). */
s = splhigh();
si->dma_counth = (ushort)(xlen >> 16);
si->dma_countl = (ushort)(xlen & 0xFFFF);
/* Set it anyway, even though dma_count hits it. */
si->fifo_cnt_hi = (ushort)(xlen >> 16);
si->fifo_count = (ushort)(xlen & 0xFFFF);
/*
* Acknowledge the phase change. (After DMA setup!)
* Put the SBIC into DMA mode, and start the transfer.
*/
if (dh->dh_flags & SIDH_OUT) {
*ncr_sc->sci_tcmd = PHASE_DATA_OUT;
SCI_CLR_INTR(ncr_sc);
*ncr_sc->sci_icmd = SCI_ICMD_DATA;
*ncr_sc->sci_mode |= (SCI_MODE_DMA | SCI_MODE_DMA_IE);
*ncr_sc->sci_dma_send = 0; /* start it */
} else {
*ncr_sc->sci_tcmd = PHASE_DATA_IN;
SCI_CLR_INTR(ncr_sc);
*ncr_sc->sci_icmd = 0;
*ncr_sc->sci_mode |= (SCI_MODE_DMA | SCI_MODE_DMA_IE);
*ncr_sc->sci_irecv = 0; /* start it */
}
/* Let'er rip! */
si->si_csr |= SI_CSR_DMA_EN;
splx(s);
ncr_sc->sc_state |= NCR_DOINGDMA;
#ifdef DEBUG
if (si_debug & 2) {
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printf("si_dma_start: started, flags=0x%x\n",
ncr_sc->sc_state);
}
#endif
}
void
si_vme_dma_eop(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
/* Not needed - DMA was stopped prior to examining sci_csr */
}
void
si_vme_dma_stop(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
struct si_softc *sc = (struct si_softc *)ncr_sc;
struct sci_req *sr = ncr_sc->sc_current;
struct si_dma_handle *dh = sr->sr_dma_hand;
volatile struct si_regs *si = sc->sc_regs;
int resid, ntrans;
if ((ncr_sc->sc_state & NCR_DOINGDMA) == 0) {
#ifdef DEBUG
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printf("si_dma_stop: dma not running\n");
#endif
return;
}
ncr_sc->sc_state &= ~NCR_DOINGDMA;
/* First, halt the DMA engine. */
si->si_csr &= ~SI_CSR_DMA_EN; /* VME only */
/* Set an impossible phase to prevent data movement? */
*ncr_sc->sci_tcmd = PHASE_INVALID;
if (si->si_csr & (SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR)) {
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printf("si: DMA error, csr=0x%x, reset\n", si->si_csr);
sr->sr_xs->error = XS_DRIVER_STUFFUP;
ncr_sc->sc_state |= NCR_ABORTING;
si_vme_reset(ncr_sc);
goto out;
}
/* Note that timeout may have set the error flag. */
if (ncr_sc->sc_state & NCR_ABORTING)
goto out;
/* XXX: Wait for DMA to actually finish? */
/*
* Now try to figure out how much actually transferred
*
* The fifo_count does not reflect how many bytes were
* actually transferred for VME.
*
* SCSI-3 VME interface is a little funny on writes:
* if we have a disconnect, the dma has overshot by
* one byte and the resid needs to be incremented.
* Only happens for partial transfers.
* (Thanks to Matt Jacob)
*/
resid = si->fifo_count & 0xFFFF;
if (dh->dh_flags & SIDH_OUT)
if ((resid > 0) && (resid < sc->sc_reqlen))
resid++;
ntrans = sc->sc_reqlen - resid;
#ifdef DEBUG
if (si_debug & 2) {
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printf("si_dma_stop: resid=0x%x ntrans=0x%x\n",
resid, ntrans);
}
#endif
if (ntrans < MIN_DMA_LEN) {
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printf("si: fifo count: 0x%x\n", resid);
ncr_sc->sc_state |= NCR_ABORTING;
goto out;
}
if (ntrans > ncr_sc->sc_datalen)
panic("si_dma_stop: excess transfer");
/* Adjust data pointer */
ncr_sc->sc_dataptr += ntrans;
ncr_sc->sc_datalen -= ntrans;
/*
* After a read, we may need to clean-up
* "Left-over bytes" (yuck!)
*/
if (((dh->dh_flags & SIDH_OUT) == 0) &&
((si->si_csr & SI_CSR_LOB) != 0))
{
char *cp = ncr_sc->sc_dataptr;
#ifdef DEBUG
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printf("si: Got Left-over bytes!\n");
#endif
if (si->si_csr & SI_CSR_BPCON) {
/* have SI_CSR_BPCON */
cp[-1] = (si->si_bprl & 0xff00) >> 8;
} else {
switch (si->si_csr & SI_CSR_LOB) {
case SI_CSR_LOB_THREE:
cp[-3] = (si->si_bprh & 0xff00) >> 8;
cp[-2] = (si->si_bprh & 0x00ff);
cp[-1] = (si->si_bprl & 0xff00) >> 8;
break;
case SI_CSR_LOB_TWO:
cp[-2] = (si->si_bprh & 0xff00) >> 8;
cp[-1] = (si->si_bprh & 0x00ff);
break;
case SI_CSR_LOB_ONE:
cp[-1] = (si->si_bprh & 0xff00) >> 8;
break;
}
}
}
out:
si->dma_addrh = 0;
si->dma_addrl = 0;
si->dma_counth = 0;
si->dma_countl = 0;
si->fifo_cnt_hi = 0;
si->fifo_count = 0;
/* Put SBIC back in PIO mode. */
*ncr_sc->sci_mode &= ~(SCI_MODE_DMA | SCI_MODE_DMA_IE);
*ncr_sc->sci_icmd = 0;
}