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| Current File : //sys/sparc64/sbus/lsi64854.c |
/*-
* Copyright (c) 2004 Scott Long
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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.
*
*/
/* $NetBSD: lsi64854.c,v 1.33 2008/04/28 20:23:50 martin Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by 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.
*
* 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>
__FBSDID("$FreeBSD: release/9.1.0/sys/sparc64/sbus/lsi64854.c 227718 2011-11-19 13:33:21Z marius $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/scsi/scsi_all.h>
#include <sparc64/sbus/lsi64854reg.h>
#include <sparc64/sbus/lsi64854var.h>
#include <dev/esp/ncr53c9xreg.h>
#include <dev/esp/ncr53c9xvar.h>
#ifdef DEBUG
#define LDB_SCSI 1
#define LDB_ENET 2
#define LDB_PP 4
#define LDB_ANY 0xff
int lsi64854debug = 0;
#define DPRINTF(a,x) \
do { \
if ((lsi64854debug & (a)) != 0) \
printf x; \
} while (/* CONSTCOND */0)
#else
#define DPRINTF(a,x)
#endif
/*
* The rules say we cannot transfer more than the limit of this DMA chip (64k
* for old and 16Mb for new), and we cannot cross a 16Mb boundary.
*/
#define MAX_DMA_SZ (64 * 1024)
#define BOUNDARY (16 * 1024 * 1024)
static void lsi64854_reset(struct lsi64854_softc *);
static void lsi64854_map_scsi(void *, bus_dma_segment_t *, int, int);
static int lsi64854_setup(struct lsi64854_softc *, void **, size_t *,
int, size_t *);
static int lsi64854_scsi_intr(void *);
static int lsi64854_enet_intr(void *);
static int lsi64854_setup_pp(struct lsi64854_softc *, void **,
size_t *, int, size_t *);
static int lsi64854_pp_intr(void *);
/*
* Finish attaching this DMA device.
* Front-end must fill in these fields:
* sc_res
* sc_burst
* sc_channel (one of SCSI, ENET, PP)
* sc_client (one of SCSI, ENET, PP `soft_c' pointers)
*/
int
lsi64854_attach(struct lsi64854_softc *sc)
{
bus_dma_lock_t *lockfunc;
struct ncr53c9x_softc *nsc;
void *lockfuncarg;
uint32_t csr;
int error;
lockfunc = NULL;
lockfuncarg = NULL;
sc->sc_maxdmasize = MAX_DMA_SZ;
switch (sc->sc_channel) {
case L64854_CHANNEL_SCSI:
nsc = sc->sc_client;
if (NCR_LOCK_INITIALIZED(nsc) == 0) {
device_printf(sc->sc_dev, "mutex not initialized\n");
return (ENXIO);
}
lockfunc = busdma_lock_mutex;
lockfuncarg = &nsc->sc_lock;
sc->sc_maxdmasize = nsc->sc_maxxfer;
sc->intr = lsi64854_scsi_intr;
sc->setup = lsi64854_setup;
break;
case L64854_CHANNEL_ENET:
sc->intr = lsi64854_enet_intr;
break;
case L64854_CHANNEL_PP:
sc->intr = lsi64854_pp_intr;
sc->setup = lsi64854_setup_pp;
break;
default:
device_printf(sc->sc_dev, "unknown channel\n");
}
sc->reset = lsi64854_reset;
if (sc->setup != NULL) {
error = bus_dma_tag_create(
sc->sc_parent_dmat, /* parent */
1, BOUNDARY, /* alignment, boundary */
BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
BUS_SPACE_MAXADDR, /* highaddr */
NULL, NULL, /* filter, filterarg */
sc->sc_maxdmasize, /* maxsize */
1, /* nsegments */
sc->sc_maxdmasize, /* maxsegsize */
BUS_DMA_ALLOCNOW, /* flags */
lockfunc, lockfuncarg, /* lockfunc, lockfuncarg */
&sc->sc_buffer_dmat);
if (error != 0) {
device_printf(sc->sc_dev,
"cannot allocate buffer DMA tag\n");
return (error);
}
error = bus_dmamap_create(sc->sc_buffer_dmat, 0,
&sc->sc_dmamap);
if (error != 0) {
device_printf(sc->sc_dev, "DMA map create failed\n");
bus_dma_tag_destroy(sc->sc_buffer_dmat);
return (error);
}
}
csr = L64854_GCSR(sc);
sc->sc_rev = csr & L64854_DEVID;
if (sc->sc_rev == DMAREV_HME)
return (0);
device_printf(sc->sc_dev, "DMA rev. ");
switch (sc->sc_rev) {
case DMAREV_0:
printf("0");
break;
case DMAREV_ESC:
printf("ESC");
break;
case DMAREV_1:
printf("1");
break;
case DMAREV_PLUS:
printf("1+");
break;
case DMAREV_2:
printf("2");
break;
default:
printf("unknown (0x%x)", sc->sc_rev);
}
DPRINTF(LDB_ANY, (", burst 0x%x, csr 0x%x", sc->sc_burst, csr));
printf("\n");
return (0);
}
int
lsi64854_detach(struct lsi64854_softc *sc)
{
if (sc->setup != NULL) {
bus_dmamap_sync(sc->sc_buffer_dmat, sc->sc_dmamap,
(L64854_GCSR(sc) & L64854_WRITE) != 0 ?
BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
bus_dmamap_unload(sc->sc_buffer_dmat, sc->sc_dmamap);
bus_dmamap_destroy(sc->sc_buffer_dmat, sc->sc_dmamap);
bus_dma_tag_destroy(sc->sc_buffer_dmat);
}
return (0);
}
/*
* DMAWAIT waits while condition is true.
*/
#define DMAWAIT(SC, COND, MSG, DONTPANIC) do if (COND) { \
int count = 500000; \
while ((COND) && --count > 0) DELAY(1); \
if (count == 0) { \
printf("%s: line %d: CSR = 0x%lx\n", __FILE__, __LINE__, \
(u_long)L64854_GCSR(SC)); \
if (DONTPANIC) \
printf(MSG); \
else \
panic(MSG); \
} \
} while (/* CONSTCOND */0)
#define DMA_DRAIN(sc, dontpanic) do { \
uint32_t csr; \
/* \
* DMA rev0 & rev1: we are not allowed to touch the DMA "flush" \
* and "drain" bits while it is still thinking about a \
* request. \
* other revs: D_ESC_R_PEND bit reads as 0 \
*/ \
DMAWAIT(sc, L64854_GCSR(sc) & D_ESC_R_PEND, "R_PEND", dontpanic);\
if (sc->sc_rev != DMAREV_HME) { \
/* \
* Select drain bit based on revision \
* also clears errors and D_TC flag \
*/ \
csr = L64854_GCSR(sc); \
if (sc->sc_rev == DMAREV_1 || sc->sc_rev == DMAREV_0) \
csr |= D_ESC_DRAIN; \
else \
csr |= L64854_INVALIDATE; \
\
L64854_SCSR(sc, csr); \
} \
/* \
* Wait for draining to finish \
* rev0 & rev1 call this PACKCNT \
*/ \
DMAWAIT(sc, L64854_GCSR(sc) & L64854_DRAINING, "DRAINING", \
dontpanic); \
} while (/* CONSTCOND */0)
#define DMA_FLUSH(sc, dontpanic) do { \
uint32_t csr; \
/* \
* DMA rev0 & rev1: we are not allowed to touch the DMA "flush" \
* and "drain" bits while it is still thinking about a \
* request. \
* other revs: D_ESC_R_PEND bit reads as 0 \
*/ \
DMAWAIT(sc, L64854_GCSR(sc) & D_ESC_R_PEND, "R_PEND", dontpanic);\
csr = L64854_GCSR(sc); \
csr &= ~(L64854_WRITE|L64854_EN_DMA); /* no-ops on ENET */ \
csr |= L64854_INVALIDATE; /* XXX FAS ? */ \
L64854_SCSR(sc, csr); \
} while (/* CONSTCOND */0)
static void
lsi64854_reset(struct lsi64854_softc *sc)
{
bus_dma_tag_t dmat;
bus_dmamap_t dmam;
uint32_t csr;
DMA_FLUSH(sc, 1);
csr = L64854_GCSR(sc);
DPRINTF(LDB_ANY, ("%s: csr 0x%x\n", __func__, csr));
if (sc->sc_dmasize != 0) {
dmat = sc->sc_buffer_dmat;
dmam = sc->sc_dmamap;
bus_dmamap_sync(dmat, dmam, (csr & D_WRITE) != 0 ?
BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
bus_dmamap_unload(dmat, dmam);
}
if (sc->sc_rev == DMAREV_HME)
L64854_SCSR(sc, csr | D_HW_RESET_FAS366);
csr |= L64854_RESET; /* reset DMA */
L64854_SCSR(sc, csr);
DELAY(200); /* > 10 Sbus clocks(?) */
/*DMAWAIT1(sc); why was this here? */
csr = L64854_GCSR(sc);
csr &= ~L64854_RESET; /* de-assert reset line */
L64854_SCSR(sc, csr);
DELAY(5); /* allow a few ticks to settle */
csr = L64854_GCSR(sc);
csr |= L64854_INT_EN; /* enable interrupts */
if (sc->sc_rev > DMAREV_1 && sc->sc_channel == L64854_CHANNEL_SCSI) {
if (sc->sc_rev == DMAREV_HME)
csr |= D_TWO_CYCLE;
else
csr |= D_FASTER;
}
/* Set burst */
switch (sc->sc_rev) {
case DMAREV_HME:
case DMAREV_2:
csr &= ~L64854_BURST_SIZE;
if (sc->sc_burst == 32)
csr |= L64854_BURST_32;
else if (sc->sc_burst == 16)
csr |= L64854_BURST_16;
else
csr |= L64854_BURST_0;
break;
case DMAREV_ESC:
csr |= D_ESC_AUTODRAIN; /* Auto-drain */
if (sc->sc_burst == 32)
csr &= ~D_ESC_BURST;
else
csr |= D_ESC_BURST;
break;
default:
break;
}
L64854_SCSR(sc, csr);
if (sc->sc_rev == DMAREV_HME) {
bus_write_4(sc->sc_res, L64854_REG_ADDR, 0);
sc->sc_dmactl = csr;
}
sc->sc_active = 0;
DPRINTF(LDB_ANY, ("%s: done, csr 0x%x\n", __func__, csr));
}
static void
lsi64854_map_scsi(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
struct lsi64854_softc *sc;
sc = (struct lsi64854_softc *)arg;
if (error != 0)
return;
if (nseg != 1)
panic("%s: cannot map %d segments\n", __func__, nseg);
bus_dmamap_sync(sc->sc_buffer_dmat, sc->sc_dmamap,
sc->sc_datain != 0 ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
bus_write_4(sc->sc_res, L64854_REG_ADDR, segs[0].ds_addr);
}
/*
* setup a DMA transfer
*/
static int
lsi64854_setup(struct lsi64854_softc *sc, void **addr, size_t *len,
int datain, size_t *dmasize)
{
long bcnt;
int error;
uint32_t csr;
DMA_FLUSH(sc, 0);
#if 0
DMACSR(sc) &= ~D_INT_EN;
#endif
sc->sc_dmaaddr = addr;
sc->sc_dmalen = len;
sc->sc_datain = datain;
KASSERT(*dmasize <= sc->sc_maxdmasize,
("%s: transfer size %ld too large", __func__, (long)*dmasize));
sc->sc_dmasize = *dmasize;
DPRINTF(LDB_ANY, ("%s: dmasize=%ld\n", __func__, (long)*dmasize));
/*
* XXX what length?
*/
if (sc->sc_rev == DMAREV_HME) {
L64854_SCSR(sc, sc->sc_dmactl | L64854_RESET);
L64854_SCSR(sc, sc->sc_dmactl);
bus_write_4(sc->sc_res, L64854_REG_CNT, *dmasize);
}
/*
* Load the transfer buffer and program the DMA address.
* Note that the NCR53C9x core can't handle EINPROGRESS so we set
* BUS_DMA_NOWAIT.
*/
if (*dmasize != 0) {
error = bus_dmamap_load(sc->sc_buffer_dmat, sc->sc_dmamap,
*sc->sc_dmaaddr, *dmasize, lsi64854_map_scsi, sc,
BUS_DMA_NOWAIT);
if (error != 0)
return (error);
}
if (sc->sc_rev == DMAREV_ESC) {
/* DMA ESC chip bug work-around */
bcnt = *dmasize;
if (((bcnt + (long)*sc->sc_dmaaddr) & PAGE_MASK_8K) != 0)
bcnt = roundup(bcnt, PAGE_SIZE_8K);
bus_write_4(sc->sc_res, L64854_REG_CNT, bcnt);
}
/* Setup the DMA control register. */
csr = L64854_GCSR(sc);
if (datain != 0)
csr |= L64854_WRITE;
else
csr &= ~L64854_WRITE;
csr |= L64854_INT_EN;
if (sc->sc_rev == DMAREV_HME)
csr |= (D_DSBL_SCSI_DRN | D_EN_DMA);
L64854_SCSR(sc, csr);
return (0);
}
/*
* Pseudo (chained) interrupt from the esp driver to kick the
* current running DMA transfer. Called from ncr53c9x_intr()
* for now.
*
* return 1 if it was a DMA continue.
*/
static int
lsi64854_scsi_intr(void *arg)
{
struct lsi64854_softc *sc = arg;
struct ncr53c9x_softc *nsc = sc->sc_client;
bus_dma_tag_t dmat;
bus_dmamap_t dmam;
size_t dmasize;
int lxfer, resid, trans;
uint32_t csr;
csr = L64854_GCSR(sc);
DPRINTF(LDB_SCSI, ("%s: addr 0x%x, csr %b\n", __func__,
bus_read_4(sc->sc_res, L64854_REG_ADDR), csr, DDMACSR_BITS));
if (csr & (D_ERR_PEND | D_SLAVE_ERR)) {
device_printf(sc->sc_dev, "error: csr=%b\n", csr,
DDMACSR_BITS);
csr &= ~D_EN_DMA; /* Stop DMA. */
/* Invalidate the queue; SLAVE_ERR bit is write-to-clear */
csr |= D_INVALIDATE | D_SLAVE_ERR;
L64854_SCSR(sc, csr);
return (-1);
}
/* This is an "assertion" :) */
if (sc->sc_active == 0)
panic("%s: DMA wasn't active", __func__);
DMA_DRAIN(sc, 0);
/* DMA has stopped */
csr &= ~D_EN_DMA;
L64854_SCSR(sc, csr);
sc->sc_active = 0;
dmasize = sc->sc_dmasize;
if (dmasize == 0) {
/* A "Transfer Pad" operation completed. */
DPRINTF(LDB_SCSI, ("%s: discarded %d bytes (tcl=%d, "
"tcm=%d)\n", __func__, NCR_READ_REG(nsc, NCR_TCL) |
(NCR_READ_REG(nsc, NCR_TCM) << 8),
NCR_READ_REG(nsc, NCR_TCL), NCR_READ_REG(nsc, NCR_TCM)));
return (0);
}
resid = 0;
/*
* If a transfer onto the SCSI bus gets interrupted by the device
* (e.g. for a SAVEPOINTER message), the data in the FIFO counts
* as residual since the NCR53C9X counter registers get decremented
* as bytes are clocked into the FIFO.
*/
if ((csr & D_WRITE) == 0 &&
(resid = (NCR_READ_REG(nsc, NCR_FFLAG) & NCRFIFO_FF)) != 0) {
DPRINTF(LDB_SCSI, ("%s: empty esp FIFO of %d ", __func__,
resid));
if (nsc->sc_rev == NCR_VARIANT_FAS366 &&
(NCR_READ_REG(nsc, NCR_CFG3) & NCRFASCFG3_EWIDE))
resid <<= 1;
}
if ((nsc->sc_espstat & NCRSTAT_TC) == 0) {
lxfer = nsc->sc_features & NCR_F_LARGEXFER;
/*
* "Terminal count" is off, so read the residue
* out of the NCR53C9X counter registers.
*/
resid += (NCR_READ_REG(nsc, NCR_TCL) |
(NCR_READ_REG(nsc, NCR_TCM) << 8) |
(lxfer != 0 ? (NCR_READ_REG(nsc, NCR_TCH) << 16) : 0));
if (resid == 0 && dmasize == 65536 && lxfer == 0)
/* A transfer of 64k is encoded as TCL=TCM=0. */
resid = 65536;
}
trans = dmasize - resid;
if (trans < 0) { /* transferred < 0? */
#if 0
/*
* This situation can happen in perfectly normal operation
* if the ESP is reselected while using DMA to select
* another target. As such, don't print the warning.
*/
device_printf(sc->sc_dev, "xfer (%d) > req (%d)\n", trans,
dmasize);
#endif
trans = dmasize;
}
DPRINTF(LDB_SCSI, ("%s: tcl=%d, tcm=%d, tch=%d; trans=%d, resid=%d\n",
__func__, NCR_READ_REG(nsc, NCR_TCL), NCR_READ_REG(nsc, NCR_TCM),
(nsc->sc_features & NCR_F_LARGEXFER) != 0 ?
NCR_READ_REG(nsc, NCR_TCH) : 0, trans, resid));
if (dmasize != 0) {
dmat = sc->sc_buffer_dmat;
dmam = sc->sc_dmamap;
bus_dmamap_sync(dmat, dmam, (csr & D_WRITE) != 0 ?
BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(dmat, dmam);
}
*sc->sc_dmalen -= trans;
*sc->sc_dmaaddr = (char *)*sc->sc_dmaaddr + trans;
#if 0 /* this is not normal operation just yet */
if (*sc->sc_dmalen == 0 || nsc->sc_phase != nsc->sc_prevphase)
return (0);
/* and again */
dma_start(sc, sc->sc_dmaaddr, sc->sc_dmalen, DMACSR(sc) & D_WRITE);
return (1);
#endif
return (0);
}
/*
* Pseudo (chained) interrupt to le(4) driver to handle DMA errors
*/
static int
lsi64854_enet_intr(void *arg)
{
struct lsi64854_softc *sc = arg;
uint32_t csr;
int i, rv;
csr = L64854_GCSR(sc);
/* If the DMA logic shows an interrupt, claim it */
rv = ((csr & E_INT_PEND) != 0) ? 1 : 0;
if (csr & (E_ERR_PEND | E_SLAVE_ERR)) {
device_printf(sc->sc_dev, "error: csr=%b\n", csr,
EDMACSR_BITS);
csr &= ~L64854_EN_DMA; /* Stop DMA. */
/* Invalidate the queue; SLAVE_ERR bit is write-to-clear */
csr |= E_INVALIDATE | E_SLAVE_ERR;
L64854_SCSR(sc, csr);
/* Will be drained with the LE_C0_IDON interrupt. */
sc->sc_dodrain = 1;
return (-1);
}
/* XXX - is this necessary with E_DSBL_WR_INVAL on? */
if (sc->sc_dodrain) {
i = 10;
csr |= E_DRAIN;
L64854_SCSR(sc, csr);
while (i-- > 0 && (L64854_GCSR(sc) & E_DRAINING))
DELAY(1);
sc->sc_dodrain = 0;
}
return (rv);
}
static void
lsi64854_map_pp(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
struct lsi64854_softc *sc;
sc = (struct lsi64854_softc *)arg;
if (error != 0)
return;
if (nsegs != 1)
panic("%s: cannot map %d segments\n", __func__, nsegs);
bus_dmamap_sync(sc->sc_buffer_dmat, sc->sc_dmamap,
sc->sc_datain != 0 ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
bus_write_4(sc->sc_res, L64854_REG_ADDR, segs[0].ds_addr);
bus_write_4(sc->sc_res, L64854_REG_CNT, sc->sc_dmasize);
}
/*
* Setup a DMA transfer.
*/
static int
lsi64854_setup_pp(struct lsi64854_softc *sc, void **addr, size_t *len,
int datain, size_t *dmasize)
{
int error;
uint32_t csr;
DMA_FLUSH(sc, 0);
sc->sc_dmaaddr = addr;
sc->sc_dmalen = len;
sc->sc_datain = datain;
DPRINTF(LDB_PP, ("%s: pp start %ld@%p,%d\n", __func__,
(long)*sc->sc_dmalen, *sc->sc_dmaaddr, datain != 0 ? 1 : 0));
KASSERT(*dmasize <= sc->sc_maxdmasize,
("%s: transfer size %ld too large", __func__, (long)*dmasize));
sc->sc_dmasize = *dmasize;
DPRINTF(LDB_PP, ("%s: dmasize=%ld\n", __func__, (long)*dmasize));
/* Load the transfer buffer and program the DMA address. */
if (*dmasize != 0) {
error = bus_dmamap_load(sc->sc_buffer_dmat, sc->sc_dmamap,
*sc->sc_dmaaddr, *dmasize, lsi64854_map_pp, sc,
BUS_DMA_NOWAIT);
if (error != 0)
return (error);
}
/* Setup the DMA control register. */
csr = L64854_GCSR(sc);
csr &= ~L64854_BURST_SIZE;
if (sc->sc_burst == 32)
csr |= L64854_BURST_32;
else if (sc->sc_burst == 16)
csr |= L64854_BURST_16;
else
csr |= L64854_BURST_0;
csr |= P_EN_DMA | P_INT_EN | P_EN_CNT;
#if 0
/* This bit is read-only in PP csr register. */
if (datain != 0)
csr |= P_WRITE;
else
csr &= ~P_WRITE;
#endif
L64854_SCSR(sc, csr);
return (0);
}
/*
* Parallel port DMA interrupt
*/
static int
lsi64854_pp_intr(void *arg)
{
struct lsi64854_softc *sc = arg;
bus_dma_tag_t dmat;
bus_dmamap_t dmam;
size_t dmasize;
int ret, trans, resid = 0;
uint32_t csr;
csr = L64854_GCSR(sc);
DPRINTF(LDB_PP, ("%s: addr 0x%x, csr %b\n", __func__,
bus_read_4(sc->sc_res, L64854_REG_ADDR), csr, PDMACSR_BITS));
if ((csr & (P_ERR_PEND | P_SLAVE_ERR)) != 0) {
resid = bus_read_4(sc->sc_res, L64854_REG_CNT);
device_printf(sc->sc_dev, "error: resid %d csr=%b\n", resid,
csr, PDMACSR_BITS);
csr &= ~P_EN_DMA; /* Stop DMA. */
/* Invalidate the queue; SLAVE_ERR bit is write-to-clear */
csr |= P_INVALIDATE | P_SLAVE_ERR;
L64854_SCSR(sc, csr);
return (-1);
}
ret = (csr & P_INT_PEND) != 0;
if (sc->sc_active != 0) {
DMA_DRAIN(sc, 0);
resid = bus_read_4(sc->sc_res, L64854_REG_CNT);
}
/* DMA has stopped */
csr &= ~D_EN_DMA;
L64854_SCSR(sc, csr);
sc->sc_active = 0;
dmasize = sc->sc_dmasize;
trans = dmasize - resid;
if (trans < 0) /* transferred < 0? */
trans = dmasize;
*sc->sc_dmalen -= trans;
*sc->sc_dmaaddr = (char *)*sc->sc_dmaaddr + trans;
if (dmasize != 0) {
dmat = sc->sc_buffer_dmat;
dmam = sc->sc_dmamap;
bus_dmamap_sync(dmat, dmam, (csr & D_WRITE) != 0 ?
BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
bus_dmamap_unload(dmat, dmam);
}
return (ret != 0);
}