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NetBSD/sys/dev/vme/si.c

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/* $NetBSD: si.c,v 1.3 2001/04/25 17:53:43 bouyer Exp $ */
/*-
* Copyright (c) 1996,2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Glass, David Jones, Gordon W. Ross, Jason R. Thorpe and
* Paul Kranenburg.
*
* 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 VME bus-dependent of the `si' SCSI adapter.
* This hardware is frequently found on Sun 3 and Sun 4 machines.
*
* The SCSI machinery on this adapter is implemented by an NCR5380,
* which is taken care of by the chipset driver in /sys/dev/ic/ncr5380sbc.c
*
* The logic 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!
*
*/
/*
* This driver originated as an MD implementation for the sun3 and sun4
* ports. The notes pertaining to that history are included below.
*
* David Jones wrote the initial version of this module for NetBSD/sun3,
* which included support for the VME adapter only. (no reselection).
*
* Gordon Ross added support for the Sun 3 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.
*
* Jason R. Thorpe ported the autoconfiguration and VME portions to
* NetBSD/sparc, and added initial support for the 4/100 "SCSI Weird",
* a wacky OBIO variant of the VME SCSI-3. Many thanks to Chuck Cranor
* for lots of helpful tips and suggestions. Thanks also to Paul Kranenburg
* and Chris Torek for bits of insight needed along the way. Thanks to
* David Gilbert and Andrew Gillham who risked filesystem life-and-limb
* for the sake of testing. Andrew Gillham helped work out the bugs
* the 4/100 DMA code.
*/
#include "opt_ddb.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/vme/vmereg.h>
#include <dev/vme/vmevar.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsipi_debug.h>
#include <dev/scsipi/scsiconf.h>
#ifndef DDB
#define Debugger()
#endif
#ifndef DEBUG
#define DEBUG XXX
#endif
#include <dev/ic/ncr5380reg.h>
#include <dev/ic/ncr5380var.h>
#include <dev/vme/sireg.h>
/*
* Transfers smaller than this are done using PIO
* (on assumption they're not worth DMA overhead)
*/
#define MIN_DMA_LEN 128
#ifdef DEBUG
int si_debug = 0;
#endif
/*
* This structure is used to keep track of mapped DMA requests.
*/
struct si_dma_handle {
int dh_flags;
#define SIDH_BUSY 0x01 /* This DH is in use */
#define SIDH_OUT 0x02 /* DMA does data out (write) */
int dh_maplen; /* Original data length */
bus_dmamap_t dh_dmamap;
#define dh_dvma dh_dmamap->dm_segs[0].ds_addr /* VA of buffer in DVMA space */
};
/*
* The first structure member has to be the ncr5380_softc
* so we can just cast to go back and fourth between them.
*/
struct si_softc {
struct ncr5380_softc ncr_sc;
bus_space_tag_t sc_bustag; /* bus tags */
bus_dma_tag_t sc_dmatag;
vme_chipset_tag_t sc_vctag;
int sc_adapter_iv_am; /* int. vec + address modifier */
struct si_dma_handle *sc_dma;
int sc_xlen; /* length of current DMA segment. */
int sc_options; /* options for this instance. */
};
/*
* Options. By default, DMA is enabled and DMA completion interrupts
* and reselect are disabled. You may enable additional features
* the `flags' directive in your kernel's configuration file.
*
* Alternatively, you can patch your kernel with DDB or some other
* mechanism. The sc_options member of the softc is OR'd with
* the value in si_options.
*
* Note, there's a separate sw_options to make life easier.
*/
#define SI_ENABLE_DMA 0x01 /* Use DMA (maybe polled) */
#define SI_DMA_INTR 0x02 /* DMA completion interrupts */
#define SI_DO_RESELECT 0x04 /* Allow disconnect/reselect */
#define SI_OPTIONS_MASK (SI_ENABLE_DMA|SI_DMA_INTR|SI_DO_RESELECT)
#define SI_OPTIONS_BITS "\10\3RESELECT\2DMA_INTR\1DMA"
int si_options = SI_ENABLE_DMA|SI_DMA_INTR|SI_DO_RESELECT;
static int si_match __P((struct device *, struct cfdata *, void *));
static void si_attach __P((struct device *, struct device *, void *));
static int si_intr __P((void *));
static void si_reset_adapter __P((struct ncr5380_softc *));
void si_dma_alloc __P((struct ncr5380_softc *));
void si_dma_free __P((struct ncr5380_softc *));
void si_dma_poll __P((struct ncr5380_softc *));
void si_dma_setup __P((struct ncr5380_softc *));
void si_dma_start __P((struct ncr5380_softc *));
void si_dma_eop __P((struct ncr5380_softc *));
void si_dma_stop __P((struct ncr5380_softc *));
void si_intr_on __P((struct ncr5380_softc *));
void si_intr_off __P((struct ncr5380_softc *));
/*
* Shorthand bus space access
* XXX - must look into endian issues here.
*/
#define SIREG_READ(sc, index) \
bus_space_read_2((sc)->sc_regt, (sc)->sc_regh, index)
#define SIREG_WRITE(sc, index, v) \
bus_space_write_2((sc)->sc_regt, (sc)->sc_regh, index, v)
/* Auto-configuration glue. */
struct cfattach si_ca = {
sizeof(struct si_softc), si_match, si_attach
};
static int
si_match(parent, cf, aux)
struct device *parent;
struct cfdata *cf;
void *aux;
{
struct vme_attach_args *va = aux;
vme_chipset_tag_t ct = va->va_vct;
vme_am_t mod;
vme_addr_t vme_addr;
/* Make sure there is something there... */
mod = VME_AM_A24 | VME_AM_MBO | VME_AM_SUPER | VME_AM_DATA;
vme_addr = va->r[0].offset;
if (vme_probe(ct, vme_addr, 1, mod, VME_D8, NULL, 0) != 0)
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.
*/
return (vme_probe(ct, vme_addr + 0x801, 1, mod, VME_D8, NULL, 0) != 0);
}
static void
si_attach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct si_softc *sc = (struct si_softc *) self;
struct ncr5380_softc *ncr_sc = &sc->ncr_sc;
struct vme_attach_args *va = aux;
vme_chipset_tag_t ct = va->va_vct;
bus_space_tag_t bt;
bus_space_handle_t bh;
vme_mapresc_t resc;
vme_intr_handle_t ih;
vme_am_t mod;
char bits[64];
int i;
sc->sc_dmatag = va->va_bdt;
sc->sc_vctag = ct;
mod = VME_AM_A24 | VME_AM_MBO | VME_AM_SUPER | VME_AM_DATA;
if (vme_space_map(ct, va->r[0].offset, SIREG_BANK_SZ,
mod, VME_D8, 0, &bt, &bh, &resc) != 0)
panic("%s: vme_space_map", ncr_sc->sc_dev.dv_xname);
ncr_sc->sc_regt = bt;
ncr_sc->sc_regh = bh;
sc->sc_options = si_options;
ncr_sc->sc_dma_setup = si_dma_setup;
ncr_sc->sc_dma_start = si_dma_start;
ncr_sc->sc_dma_eop = si_dma_stop;
ncr_sc->sc_dma_stop = si_dma_stop;
vme_intr_map(ct, va->ilevel, va->ivector, &ih);
vme_intr_establish(ct, ih, IPL_BIO, si_intr, sc);
printf("\n");
sc->sc_adapter_iv_am = (mod << 8) | (va->ivector & 0xFF);
/*
* Pull in the options flags. Allow the user to completely
* override the default values.
*/
if ((ncr_sc->sc_dev.dv_cfdata->cf_flags & SI_OPTIONS_MASK) != 0)
sc->sc_options =
(ncr_sc->sc_dev.dv_cfdata->cf_flags & SI_OPTIONS_MASK);
/*
* Initialize fields used by the MI code
*/
/* NCR5380 register bank offsets */
ncr_sc->sci_r0 = 0;
ncr_sc->sci_r1 = 1;
ncr_sc->sci_r2 = 2;
ncr_sc->sci_r3 = 3;
ncr_sc->sci_r4 = 4;
ncr_sc->sci_r5 = 5;
ncr_sc->sci_r6 = 6;
ncr_sc->sci_r7 = 7;
ncr_sc->sc_rev = NCR_VARIANT_NCR5380;
/*
* 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_poll = si_dma_poll;
ncr_sc->sc_flags = 0;
if ((sc->sc_options & SI_DO_RESELECT) == 0)
ncr_sc->sc_no_disconnect = 0xFF;
if ((sc->sc_options & SI_DMA_INTR) == 0)
ncr_sc->sc_flags |= NCR5380_FORCE_POLLING;
ncr_sc->sc_min_dma_len = MIN_DMA_LEN;
/*
* Allocate DMA handles.
*/
i = SCI_OPENINGS * sizeof(struct si_dma_handle);
sc->sc_dma = (struct si_dma_handle *)malloc(i, M_DEVBUF, M_NOWAIT);
if (sc->sc_dma == NULL)
panic("si: dma handle malloc failed\n");
for (i = 0; i < SCI_OPENINGS; i++) {
sc->sc_dma[i].dh_flags = 0;
/* Allocate a DMA handle */
if (vme_dmamap_create(
sc->sc_vctag, /* VME chip tag */
MAXPHYS, /* size */
VME_AM_A24, /* address modifier */
VME_D16, /* data size */
0, /* swap */
1, /* nsegments */
MAXPHYS, /* maxsegsz */
0, /* boundary */
BUS_DMA_NOWAIT,
&sc->sc_dma[i].dh_dmamap) != 0) {
printf("%s: DMA buffer map create error\n",
ncr_sc->sc_dev.dv_xname);
return;
}
}
if (sc->sc_options) {
printf("%s: options=%s\n", ncr_sc->sc_dev.dv_xname,
bitmask_snprintf(sc->sc_options, SI_OPTIONS_BITS,
bits, sizeof(bits)));
}
ncr_sc->sc_channel.chan_id = 7;
ncr_sc->sc_adapter.adapt_minphys = minphys;
/*
* Initialize si board itself.
*/
si_reset_adapter(ncr_sc);
ncr5380_attach(ncr_sc);
if (sc->sc_options & SI_DO_RESELECT) {
/*
* Need to enable interrupts (and DMA!)
* on this H/W for reselect to work.
*/
ncr_sc->sc_intr_on = si_intr_on;
ncr_sc->sc_intr_off = si_intr_off;
}
}
#define CSR_WANT (SI_CSR_SBC_IP | SI_CSR_DMA_IP | \
SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR )
static int
si_intr(void *arg)
{
struct si_softc *sc = arg;
struct ncr5380_softc *ncr_sc = (struct ncr5380_softc *)arg;
int dma_error, claimed;
u_short csr;
claimed = 0;
dma_error = 0;
/* SBC interrupt? DMA interrupt? */
csr = SIREG_READ(ncr_sc, SIREG_CSR);
NCR_TRACE("si_intr: csr=0x%x\n", csr);
if (csr & SI_CSR_DMA_CONFLICT) {
dma_error |= SI_CSR_DMA_CONFLICT;
printf("si_intr: DMA conflict\n");
}
if (csr & SI_CSR_DMA_BUS_ERR) {
dma_error |= SI_CSR_DMA_BUS_ERR;
printf("si_intr: DMA bus error\n");
}
if (dma_error) {
if (sc->ncr_sc.sc_state & NCR_DOINGDMA)
sc->ncr_sc.sc_state |= NCR_ABORTING;
/* Make sure we will call the main isr. */
csr |= SI_CSR_DMA_IP;
}
if (csr & (SI_CSR_SBC_IP | SI_CSR_DMA_IP)) {
claimed = ncr5380_intr(&sc->ncr_sc);
#ifdef DEBUG
if (!claimed) {
printf("si_intr: spurious from SBC\n");
if (si_debug & 4) {
Debugger(); /* XXX */
}
}
#endif
}
return (claimed);
}
static void
si_reset_adapter(struct ncr5380_softc *ncr_sc)
{
struct si_softc *sc = (struct si_softc *)ncr_sc;
#ifdef DEBUG
if (si_debug) {
printf("si_reset_adapter\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.
*/
SIREG_WRITE(ncr_sc, SIREG_CSR, 0);
delay(10);
SIREG_WRITE(ncr_sc, SIREG_CSR,
SI_CSR_FIFO_RES | SI_CSR_SCSI_RES | SI_CSR_INTR_EN);
delay(10);
SIREG_WRITE(ncr_sc, SIREG_FIFO_CNT, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_ADDRH, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_ADDRL, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_CNTH, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_CNTL, 0);
SIREG_WRITE(ncr_sc, SIREG_IV_AM, sc->sc_adapter_iv_am);
SIREG_WRITE(ncr_sc, SIREG_FIFO_CNTH, 0);
SCI_CLR_INTR(ncr_sc);
}
/*****************************************************************
* Common functions for DMA
****************************************************************/
/*
* Allocate a DMA handle and put it in sc->sc_dma. Prepare
* for DMA transfer.
*/
void
si_dma_alloc(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 scsipi_xfer *xs = sr->sr_xs;
struct si_dma_handle *dh;
int i, xlen;
u_long addr;
#ifdef DIAGNOSTIC
if (sr->sr_dma_hand != NULL)
panic("si_dma_alloc: already have DMA handle");
#endif
#if 1 /* XXX - Temporary */
/* XXX - In case we think DMA is completely broken... */
if ((sc->sc_options & SI_ENABLE_DMA) == 0)
return;
#endif
addr = (u_long) ncr_sc->sc_dataptr;
xlen = ncr_sc->sc_datalen;
/* If the DMA start addr is misaligned then do PIO */
if ((addr & 1) || (xlen & 1)) {
printf("si_dma_alloc: misaligned.\n");
return;
}
/* Make sure our caller checked sc_min_dma_len. */
if (xlen < MIN_DMA_LEN)
panic("si_dma_alloc: xlen=0x%x\n", xlen);
/* Find free DMA handle. Guaranteed to find one since we have
as many DMA handles as the driver has processes. */
for (i = 0; i < SCI_OPENINGS; i++) {
if ((sc->sc_dma[i].dh_flags & SIDH_BUSY) == 0)
goto found;
}
panic("si: no free DMA handles.");
found:
dh = &sc->sc_dma[i];
dh->dh_flags = SIDH_BUSY;
dh->dh_maplen = xlen;
/* Copy the "write" flag for convenience. */
if ((xs->xs_control & XS_CTL_DATA_OUT) != 0)
dh->dh_flags |= SIDH_OUT;
/*
* Double-map the buffer into DVMA space. If we can't re-map
* the buffer, we print a warning and fall back to PIO mode.
*
* NOTE: it is not safe to sleep here!
*/
if (bus_dmamap_load(sc->sc_dmatag, dh->dh_dmamap,
(caddr_t)addr, xlen, NULL, BUS_DMA_NOWAIT) != 0) {
/* Can't remap segment */
printf("si_dma_alloc: can't remap 0x%lx/0x%x, doing PIO\n",
addr, dh->dh_maplen);
dh->dh_flags = 0;
return;
}
bus_dmamap_sync(sc->sc_dmatag, dh->dh_dmamap, addr, xlen,
(dh->dh_flags & SIDH_OUT)
? BUS_DMASYNC_PREWRITE
: BUS_DMASYNC_PREREAD);
/* success */
sr->sr_dma_hand = dh;
return;
}
void
si_dma_free(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;
#ifdef DIAGNOSTIC
if (dh == NULL)
panic("si_dma_free: no DMA handle");
#endif
if (ncr_sc->sc_state & NCR_DOINGDMA)
panic("si_dma_free: free while in progress");
if (dh->dh_flags & SIDH_BUSY) {
/* Give back the DVMA space. */
bus_dmamap_sync(sc->sc_dmatag, dh->dh_dmamap,
dh->dh_dvma, dh->dh_maplen,
(dh->dh_flags & SIDH_OUT)
? BUS_DMASYNC_POSTWRITE
: BUS_DMASYNC_POSTREAD);
bus_dmamap_unload(sc->sc_dmatag, dh->dh_dmamap);
dh->dh_flags = 0;
}
sr->sr_dma_hand = NULL;
}
/*
* Poll (spin-wait) for DMA completion.
* Called right after xx_dma_start(), and
* xx_dma_stop() will be called next.
* Same for either VME or OBIO.
*/
void
si_dma_poll(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
struct sci_req *sr = ncr_sc->sc_current;
int tmo, csr_mask, csr;
/* Make sure DMA started successfully. */
if (ncr_sc->sc_state & NCR_ABORTING)
return;
csr_mask = SI_CSR_SBC_IP | SI_CSR_DMA_IP |
SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR;
tmo = 50000; /* X100 = 5 sec. */
for (;;) {
csr = SIREG_READ(ncr_sc, SIREG_CSR);
if (csr & csr_mask)
break;
if (--tmo <= 0) {
printf("%s: DMA timeout (while polling)\n",
ncr_sc->sc_dev.dv_xname);
/* Indicate timeout as MI code would. */
sr->sr_flags |= SR_OVERDUE;
break;
}
delay(100);
}
#ifdef DEBUG
if (si_debug) {
printf("si_dma_poll: done, csr=0x%x\n", csr);
}
#endif
}
/*****************************************************************
* VME functions for DMA
****************************************************************/
/*
* 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_intr_on(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
u_int16_t csr;
si_dma_setup(ncr_sc);
csr = SIREG_READ(ncr_sc, SIREG_CSR);
csr |= SI_CSR_DMA_EN;
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
}
/*
* This is called when the bus is idle and we are
* about to start playing with the SBC chip.
*/
void
si_intr_off(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
u_int16_t csr;
csr = SIREG_READ(ncr_sc, SIREG_CSR);
csr &= ~SI_CSR_DMA_EN;
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
}
/*
* This function is called during the COMMAND or MSG_IN phase
* that preceeds 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 we just clear the DMA count and address
* here (to make sure it stays idle) and do the real setup
* later, in dma_start.
*/
void
si_dma_setup(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
u_int16_t csr;
csr = SIREG_READ(ncr_sc, SIREG_CSR);
/* Reset the FIFO */
csr &= ~SI_CSR_FIFO_RES; /* active low */
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
csr |= SI_CSR_FIFO_RES;
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
/* Set direction (assume recv here) */
csr &= ~SI_CSR_SEND;
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
/* Assume worst alignment */
csr |= SI_CSR_BPCON;
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
SIREG_WRITE(ncr_sc, SIREG_DMA_ADDRH, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_ADDRL, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_CNTH, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_CNTL, 0);
/* Clear FIFO counter. (also hits dma_count) */
SIREG_WRITE(ncr_sc, SIREG_FIFO_CNTH, 0);
SIREG_WRITE(ncr_sc, SIREG_FIFO_CNT, 0);
}
void
si_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;
u_long dva;
int xlen;
u_int mode;
u_int16_t csr;
/*
* Get the DVMA mapping for this segment.
*/
dva = (u_long)(dh->dh_dvma);
if (dva & 1)
panic("si_dma_start: bad dmaaddr=0x%lx", dva);
xlen = ncr_sc->sc_datalen;
xlen &= ~1;
sc->sc_xlen = xlen; /* XXX: or less... */
#ifdef DEBUG
if (si_debug & 2) {
printf("si_dma_start: dh=%p, dmaaddr=0x%lx, xlen=%d\n",
dh, dva, xlen);
}
#endif
/*
* Set up the DMA controller.
* Note that (dh->dh_len < sc_datalen)
*/
csr = SIREG_READ(ncr_sc, SIREG_CSR);
/* Disable DMA while we're setting up the transfer */
csr &= ~SI_CSR_DMA_EN;
/* Reset FIFO (again?) */
csr &= ~SI_CSR_FIFO_RES; /* active low */
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
csr |= SI_CSR_FIFO_RES;
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
/* Set direction (send/recv) */
if (dh->dh_flags & SIDH_OUT) {
csr |= SI_CSR_SEND;
} else {
csr &= ~SI_CSR_SEND;
}
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
if (dva & 2) {
csr |= SI_CSR_BPCON;
} else {
csr &= ~SI_CSR_BPCON;
}
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
SIREG_WRITE(ncr_sc, SIREG_DMA_ADDRH, (u_int16_t)(dva >> 16));
SIREG_WRITE(ncr_sc, SIREG_DMA_ADDRL, (u_int16_t)(dva & 0xFFFF));
SIREG_WRITE(ncr_sc, SIREG_DMA_CNTH, (u_int16_t)(xlen >> 16));
SIREG_WRITE(ncr_sc, SIREG_DMA_CNTL, (u_int16_t)(xlen & 0xFFFF));
SIREG_WRITE(ncr_sc, SIREG_FIFO_CNTH, (u_int16_t)(xlen >> 16));
SIREG_WRITE(ncr_sc, SIREG_FIFO_CNT, (u_int16_t)(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) {
NCR5380_WRITE(ncr_sc, sci_tcmd, PHASE_DATA_OUT);
SCI_CLR_INTR(ncr_sc);
NCR5380_WRITE(ncr_sc, sci_icmd, SCI_ICMD_DATA);
mode = NCR5380_READ(ncr_sc, sci_mode);
mode |= (SCI_MODE_DMA | SCI_MODE_DMA_IE);
NCR5380_WRITE(ncr_sc, sci_mode, mode);
NCR5380_WRITE(ncr_sc, sci_dma_send, 0); /* start it */
} else {
NCR5380_WRITE(ncr_sc, sci_tcmd, PHASE_DATA_IN);
SCI_CLR_INTR(ncr_sc);
NCR5380_WRITE(ncr_sc, sci_icmd, 0);
mode = NCR5380_READ(ncr_sc, sci_mode);
mode |= (SCI_MODE_DMA | SCI_MODE_DMA_IE);
NCR5380_WRITE(ncr_sc, sci_mode, mode);
NCR5380_WRITE(ncr_sc, sci_irecv, 0); /* start it */
}
/* Enable DMA engine */
csr |= SI_CSR_DMA_EN;
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
ncr_sc->sc_state |= NCR_DOINGDMA;
#ifdef DEBUG
if (si_debug & 2) {
printf("si_dma_start: started, flags=0x%x\n",
ncr_sc->sc_state);
}
#endif
}
void
si_dma_eop(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
/* Not needed - DMA was stopped prior to examining sci_csr */
}
void
si_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;
int resid, ntrans;
u_int16_t csr;
u_int mode;
if ((ncr_sc->sc_state & NCR_DOINGDMA) == 0) {
#ifdef DEBUG
printf("si_dma_stop: dma not running\n");
#endif
return;
}
ncr_sc->sc_state &= ~NCR_DOINGDMA;
csr = SIREG_READ(ncr_sc, SIREG_CSR);
/* First, halt the DMA engine. */
csr &= ~SI_CSR_DMA_EN;
SIREG_WRITE(ncr_sc, SIREG_CSR, csr);
if (csr & (SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR)) {
printf("si: DMA error, csr=0x%x, reset\n", csr);
sr->sr_xs->error = XS_DRIVER_STUFFUP;
ncr_sc->sc_state |= NCR_ABORTING;
si_reset_adapter(ncr_sc);
}
/* Note that timeout may have set the error flag. */
if (ncr_sc->sc_state & NCR_ABORTING)
goto out;
/*
* 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 = SIREG_READ(ncr_sc, SIREG_FIFO_CNTH) << 16;
resid |= SIREG_READ(ncr_sc, SIREG_FIFO_CNT) & 0xFFFF;
if (dh->dh_flags & SIDH_OUT)
if ((resid > 0) && (resid < sc->sc_xlen))
resid++;
ntrans = sc->sc_xlen - resid;
#ifdef DEBUG
if (si_debug & 2) {
printf("si_dma_stop: resid=0x%x ntrans=0x%x\n",
resid, ntrans);
}
#endif
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;
#ifdef DEBUG
if (si_debug & 2) {
printf("si_dma_stop: ntrans=0x%x\n", ntrans);
}
#endif
/*
* After a read, we may need to clean-up
* "Left-over bytes" (yuck!)
*/
if (((dh->dh_flags & SIDH_OUT) == 0) &&
((csr & SI_CSR_LOB) != 0))
{
char *cp = ncr_sc->sc_dataptr;
u_int16_t bprh, bprl;
bprh = SIREG_READ(ncr_sc, SIREG_BPRH);
bprl = SIREG_READ(ncr_sc, SIREG_BPRL);
#ifdef DEBUG
printf("si: got left-over bytes: bprh=%x, bprl=%x, csr=%x\n",
bprh, bprl, csr);
#endif
if (csr & SI_CSR_BPCON) {
/* have SI_CSR_BPCON */
cp[-1] = (bprl & 0xff00) >> 8;
} else {
switch (csr & SI_CSR_LOB) {
case SI_CSR_LOB_THREE:
cp[-3] = (bprh & 0xff00) >> 8;
cp[-2] = (bprh & 0x00ff);
cp[-1] = (bprl & 0xff00) >> 8;
break;
case SI_CSR_LOB_TWO:
cp[-2] = (bprh & 0xff00) >> 8;
cp[-1] = (bprh & 0x00ff);
break;
case SI_CSR_LOB_ONE:
cp[-1] = (bprh & 0xff00) >> 8;
break;
}
}
}
out:
SIREG_WRITE(ncr_sc, SIREG_DMA_ADDRH, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_ADDRL, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_CNTH, 0);
SIREG_WRITE(ncr_sc, SIREG_DMA_CNTL, 0);
SIREG_WRITE(ncr_sc, SIREG_FIFO_CNTH, 0);
SIREG_WRITE(ncr_sc, SIREG_FIFO_CNT, 0);
mode = NCR5380_READ(ncr_sc, sci_mode);
/* Put SBIC back in PIO mode. */
mode &= ~(SCI_MODE_DMA | SCI_MODE_DMA_IE);
NCR5380_WRITE(ncr_sc, sci_mode, mode);
NCR5380_WRITE(ncr_sc, sci_icmd, 0);
}
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