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NetBSD/sys/arch/vax/vsa/ncr.c

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/* $NetBSD: ncr.c,v 1.4 1996/10/11 01:51:52 christos Exp $ */
/* #define DEBUG /* */
/* #define TRACE /* */
/* #define POLL_MODE /* */
#define USE_VMAPBUF
/*
* Copyright (c) 1995 David Jones, Gordon W. Ross
* Copyright (c) 1994 Adam Glass
* 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.
* 3. The name of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* 4. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by
* Adam Glass, David Jones, and Gordon Ross
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.
*
* VS2000:
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/map.h>
#include <sys/device.h>
#include <sys/dkstat.h>
#include <sys/disklabel.h>
#include <sys/disk.h>
#include <sys/syslog.h>
/* #include <sys/errno.h> */
#include <scsi/scsi_all.h>
#include <scsi/scsi_debug.h>
#include <scsi/scsiconf.h>
#include <machine/uvax.h>
#include <machine/ka410.h>
#include <machine/ka43.h>
#include <machine/vsbus.h> /* struct confargs */
#include <dev/ic/ncr5380reg.h>
#include <dev/ic/ncr5380var.h>
#define trace(x)
#define debug(x)
#ifndef NCR5380_CSRBITS
#define NCR5380_CSRBITS \
"\020\010DEND\007DREQ\006PERR\005IREQ\004MTCH\003DCON\002ATN\001ACK"
#endif
#ifndef NCR5380_BUSCSRBITS
#define NCR5380_BUSCSRBITS \
"\020\010RST\007BSY\006REQ\005MSG\004C/D\003I/O\002SEL\001DBP"
#endif
#include "ncr.h"
#ifdef DDB
#define integrate
#else
#define integrate static
#endif
/*
* Transfers smaller than this are done using PIO
* (on assumption they're not worth DMA overhead)
*/
#define MIN_DMA_LEN 128
/*
* Transfers lager than 65535 bytes need to be split-up.
* (Some of the FIFO logic has only 16 bits counters.)
* Make the size an integer multiple of the page size
* to avoid buf/cluster remap problems. (paranoid?)
*
* bertram: VS2000 has an DMA-area which is 16KB, thus
* have a maximum DMA-size of 16KB...
*/
#ifdef DMA_SHARED
#define MAX_DMA_LEN 0x2000 /* (8 * 1024) */
#define DMA_ADDR_HBYTE 0x20
#define DMA_ADDR_LBYTE 0x00
#else
#define MAX_DMA_LEN 0x4000 /* (16 * 1024) */
#define DMA_ADDR_HBYTE 0x00
#define DMA_ADDR_LBYTE 0x00
#endif
#ifdef DEBUG
int si_debug = 3;
static int si_link_flags = 0 /* | SDEV_DB2 */ ;
#endif
/*
* This structure is used to keep track of mappedpwd DMA requests.
* Note: combined the UDC command block with this structure, so
* the array of these has to be in DVMA space.
*/
struct si_dma_handle {
int dh_flags;
#define SIDH_BUSY 1 /* This DH is in use */
#define SIDH_OUT 2 /* DMA does data out (write) */
#define SIDH_PHYS 4
#define SIDH_DONE 8
u_char * dh_addr; /* KVA of start of buffer */
int dh_maplen; /* Length of KVA mapping. */
u_char * dh_dvma; /* VA of buffer in DVMA space */
int dh_xlen;
};
/*
* 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;
volatile struct si_regs *sc_regs; /* do we really need this? */
struct si_dma_handle *sc_dma;
struct confargs *sc_cfargs;
int sc_xflags; /* ka410/ka43: resid, sizeof(areg) */
char *sc_dbase;
int sc_dsize;
volatile char *sc_dareg;
volatile short *sc_dcreg;
volatile char *sc_ddreg;
volatile int sc_dflags;
#define VSDMA_LOCKED 0x80 /* */
#define VSDMA_WANTED 0x40 /* */
#define VSDMA_IWANTED 0x20
#define VSDMA_BLOCKED 0x10
#define VSDMA_DMABUSY 0x08 /* DMA in progress */
#define VSDMA_REGBUSY 0x04 /* accessing registers */
#define VSDMA_WRBUF 0x02 /* writing to bounce-buffer */
#define VSDMA_RDBUF 0x01 /* reading from bounce-buffer */
#define VSDMA_STATUS 0xF0
#define VSDMA_LCKTYPE 0x0F
#ifdef POLL_MODE
volatile u_char *intreq;
volatile u_char *intclr;
volatile u_char *intmsk;
volatile int intbit;
#endif
};
extern int cold; /* enable polling while cold-flag set */
/* Options. Interesting values are: 1,3,7 */
int si_options = 3; /* bertram: 3 or 7 ??? */
#define SI_ENABLE_DMA 1 /* Use DMA (maybe polled) */
#define SI_DMA_INTR 2 /* DMA completion interrupts */
#define SI_DO_RESELECT 4 /* Allow disconnect/reselect */
#define DMA_DIR_IN 1
#define DMA_DIR_OUT 0
/* How long to wait for DMA before declaring an error. */
int si_dma_intr_timo = 500; /* ticks (sec. X 100) */
integrate char si_name[] = "ncr";
integrate int si_match();
integrate void si_attach();
integrate int si_intr __P((void *));
integrate void si_minphys __P((struct buf *bp));
integrate void si_reset_adapter __P((struct ncr5380_softc *sc));
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_intr_on __P((struct ncr5380_softc *));
void si_intr_off __P((struct ncr5380_softc *));
int si_dmaLockBus __P((struct ncr5380_softc *, int));
int si_dmaToggleLock __P((struct ncr5380_softc *, int, int));
int si_dmaReleaseBus __P((struct ncr5380_softc *, int));
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 *));
static struct scsi_adapter si_ops = {
ncr5380_scsi_cmd, /* scsi_cmd() */
si_minphys, /* scsi_minphys() */
NULL, /* open_target_lu() */
NULL, /* close_target_lu() */
};
/* This is copied from julian's bt driver */
/* "so we have a default dev struct for our link struct." */
static struct scsi_device si_dev = {
NULL, /* Use default error handler. */
NULL, /* Use default start handler. */
NULL, /* Use default async handler. */
NULL, /* Use default "done" routine. */
};
struct cfdriver ncr_cd = {
NULL, si_name, DV_DULL
};
struct cfattach ncr_ca = {
sizeof(struct si_softc), si_match, si_attach,
};
void
dk_establish(p,q)
struct disk *p;
struct device *q;
{
#if 0
kprintf ("faking dk_establish()...\n");
#endif
}
integrate int
si_match(parent, match, aux)
struct device *parent;
void *match, *aux;
{
struct cfdata *cf = match;
struct confargs *ca = aux;
trace(("ncr_match(0x%x, %d, %s)\n", parent, cf->cf_unit, ca->ca_name));
if (strcmp(ca->ca_name, "ncr") &&
strcmp(ca->ca_name, "ncr5380") &&
strcmp(ca->ca_name, "NCR5380"))
return (0);
/*
* we just define it being there ...
*/
return (1);
}
integrate void
si_set_portid(pid,port)
int pid;
int port;
{
struct {
u_long :2;
u_long id0:3;
u_long id1:3;
u_long :26;
} *p;
#ifdef DEBUG
int *ip;
ip = (void*)uvax_phys2virt(KA410_SCSIPORT);
p = (void*)uvax_phys2virt(KA410_SCSIPORT);
kprintf("scsi-id: (%x/%d) %d / %d\n", *ip, *ip, p->id0, p->id1);
#endif
p = (void*)uvax_phys2virt(KA410_SCSIPORT);
switch (port) {
case 0:
p->id0 = pid;
kprintf(": scsi-id %d\n", p->id0);
break;
case 1:
p->id1 = pid;
kprintf(": scsi-id %d\n", p->id1);
break;
default:
kprintf("invalid port-number %d\n", port);
}
}
integrate 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 = (struct ncr5380_softc *)sc;
volatile struct si_regs *regs;
struct confargs *ca = aux;
int i;
int *ip = aux;;
trace (("ncr_attach(0x%x, 0x%x, %s)\n", parent, self, ca->ca_name));
/*
*
*/
#ifdef POLL_MODE
sc->intreq = (void*)uvax_phys2virt(KA410_INTREQ);
sc->intmsk = (void*)uvax_phys2virt(KA410_INTMSK);
sc->intclr = (void*)uvax_phys2virt(KA410_INTCLR);
sc->intbit = ca->ca_intbit;
#endif
sc->sc_cfargs = ca; /* needed for interrupt-setup */
regs = (void*)uvax_phys2virt(ca->ca_ioaddr);
sc->sc_dareg = (void*)uvax_phys2virt(ca->ca_dareg);
sc->sc_dcreg = (void*)uvax_phys2virt(ca->ca_dcreg);
sc->sc_ddreg = (void*)uvax_phys2virt(ca->ca_ddreg);
sc->sc_dbase = (void*)uvax_phys2virt(ca->ca_dbase);
sc->sc_dsize = ca->ca_dsize;
sc->sc_dflags = 4; /* XXX */
sc->sc_xflags = ca->ca_dflag; /* should/will be renamed */
/*
* Fill in the prototype scsi_link.
*/
ncr_sc->sc_link.channel = SCSI_CHANNEL_ONLY_ONE;
ncr_sc->sc_link.adapter_softc = sc;
ncr_sc->sc_link.adapter_target = ca->ca_idval;
ncr_sc->sc_link.adapter = &si_ops;
ncr_sc->sc_link.device = &si_dev;
si_set_portid(ca->ca_idval, ncr_sc->sc_dev.dv_unit);
/*
* Initialize fields used by the MI code
*/
ncr_sc->sci_r0 = (void*)&regs->sci.sci_r0;
ncr_sc->sci_r1 = (void*)&regs->sci.sci_r1;
ncr_sc->sci_r2 = (void*)&regs->sci.sci_r2;
ncr_sc->sci_r3 = (void*)&regs->sci.sci_r3;
ncr_sc->sci_r4 = (void*)&regs->sci.sci_r4;
ncr_sc->sci_r5 = (void*)&regs->sci.sci_r5;
ncr_sc->sci_r6 = (void*)&regs->sci.sci_r6;
ncr_sc->sci_r7 = (void*)&regs->sci.sci_r7;
/*
* 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; /* si_dma_poll not used! */
ncr_sc->sc_intr_on = si_intr_on; /* vsbus_unlockDMA; */
ncr_sc->sc_intr_off = si_intr_off; /* vsbus_lockDMA; */
ncr_sc->sc_dma_setup = NULL; /* si_dma_setup not used! */
ncr_sc->sc_dma_start = si_dma_start;
ncr_sc->sc_dma_eop = NULL;
ncr_sc->sc_dma_stop = si_dma_stop;
ncr_sc->sc_flags = 0;
if (si_options & SI_DO_RESELECT)
ncr_sc->sc_flags |= NCR5380_PERMIT_RESELECT;
if ((si_options & SI_DMA_INTR) == 0)
ncr_sc->sc_flags |= NCR5380_FORCE_POLLING;
ncr_sc->sc_min_dma_len = MIN_DMA_LEN;
/*
* Initialize fields used only here in the MD code.
*/
i = SCI_OPENINGS * sizeof(struct si_dma_handle);
sc->sc_dma = (struct si_dma_handle *) malloc(i);
if (sc->sc_dma == NULL)
panic("si: dvma_malloc failed\n");
for (i = 0; i < SCI_OPENINGS; i++)
sc->sc_dma[i].dh_flags = 0;
sc->sc_regs = regs;
#ifdef DEBUG
if (si_debug)
kprintf("si: Set TheSoftC=%x TheRegs=%x\n", sc, regs);
ncr_sc->sc_link.flags |= si_link_flags;
#endif
/*
* Initialize si board itself.
*/
si_reset_adapter(ncr_sc);
ncr5380_init(ncr_sc);
ncr5380_reset_scsibus(ncr_sc);
config_found(self, &(ncr_sc->sc_link), scsiprint);
/*
* Now ready for interrupts.
*/
vsbus_intr_register(sc->sc_cfargs, si_intr, (void *)sc);
vsbus_intr_enable(sc->sc_cfargs);
}
integrate void
si_minphys(struct buf *bp)
{
debug(("minphys: blkno=%d, bcount=%d, data=0x%x, flags=%x\n",
bp->b_blkno, bp->b_bcount, bp->b_data, bp->b_flags));
if (bp->b_bcount > MAX_DMA_LEN) {
#ifdef DEBUG
if (si_debug) {
kprintf("si_minphys len = 0x%x.\n", bp->b_bcount);
Debugger();
}
#endif
bp->b_bcount = MAX_DMA_LEN;
}
return (minphys(bp));
}
#define CSR_WANT (SI_CSR_SBC_IP | SI_CSR_DMA_IP | \
SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR )
static int si_intrCount = 0;
static int lastCSR = 0;
integrate int
si_intr(arg)
void *arg;
{
struct ncr5380_softc *ncr_sc = arg;
struct si_softc *sc = arg;
int count, claimed;
count = ++si_intrCount;
trace(("%s: si-intr(%d).....\n", ncr_sc->sc_dev.dv_xname, count));
#ifdef DEBUG
/*
* Each DMA interrupt is followed by one spurious(?) interrupt.
* if (ncr_sc->sc_state & NCR_WORKING == 0) we know, that the
* interrupt was not claimed by the higher-level routine, so that
* it might be save to ignore these...
*/
if ((ncr_sc->sc_state & NCR_DOINGDMA) == 0) {
kprintf("spurious(%d): %x, %d, status=%b\n", count,
sc->sc_dflags, ncr_sc->sc_ncmds,
*ncr_sc->sci_csr, NCR5380_CSRBITS);
}
#endif
/*
* If there was a DMA operation in progress, now it's no longer
* active, since whatever caused the interrupt also interrupted
* the DMA operation. Thus accessing the registers now doesn't
* harm anything which is not yet broken...
*/
debug(("si_intr(status: %x, dma-count: %d)\n",
*ncr_sc->sci_csr, *sc->sc_dcreg));
/*
* First check for DMA errors / incomplete transfers
* If operation was read/data-in, the copy data from buffer
*/
if (ncr_sc->sc_state & NCR_DOINGDMA) {
struct sci_req *sr = ncr_sc->sc_current;
struct si_dma_handle *dh = sr->sr_dma_hand;
int resid, ntrans;
resid = *sc->sc_dcreg;
if (resid == 1 && sc->sc_xflags) {
debug(("correcting resid...\n"));
resid = 0;
}
ntrans = dh->dh_xlen + resid;
if (resid == 0) {
if ((dh->dh_flags & SIDH_OUT) == 0) {
si_dmaToggleLock(ncr_sc,
VSDMA_DMABUSY, VSDMA_RDBUF);
bcopy(sc->sc_dbase, dh->dh_dvma, ntrans);
si_dmaToggleLock(ncr_sc,
VSDMA_RDBUF, VSDMA_DMABUSY);
dh->dh_flags |= SIDH_DONE;
}
}
else {
#ifdef DEBUG
int csr = *ncr_sc->sci_csr;
kprintf("DMA incomplete (%d/%d) status = %b\n",
ntrans, resid, csr, NCR5380_CSRBITS);
if(csr != lastCSR) {
int k = (csr & ~lastCSR) | (~csr & lastCSR);
debug(("Changed status bits: %b\n",
k, NCR5380_CSRBITS));
lastCSR = csr & 0xFF;
}
#endif
kprintf("DMA incomplete: ntrans=%d/%d, lock=%x\n",
ntrans, dh->dh_xlen, sc->sc_dflags);
ncr_sc->sc_state |= NCR_ABORTING;
}
if ((sc->sc_dflags & VSDMA_BLOCKED) == 0) {
kprintf("not blocked during DMA.\n");
}
sc->sc_dflags &= ~VSDMA_BLOCKED;
si_dmaReleaseBus(ncr_sc, VSDMA_DMABUSY);
}
if ((sc->sc_dflags & VSDMA_BLOCKED) != 0) {
kprintf("blocked while not doing DMA.\n");
sc->sc_dflags &= ~VSDMA_BLOCKED;
}
/*
* Now, whatever it was, let the ncr5380sbc routine handle it...
*/
claimed = ncr5380_intr(ncr_sc);
#ifdef DEBUG
if (!claimed) {
kprintf("si_intr: spurious from SBC\n");
if (si_debug & 4) {
Debugger(); /* XXX */
}
}
#endif
trace(("%s: si-intr(%d) done, claimed=%d\n",
ncr_sc->sc_dev.dv_xname, count, claimed));
return (claimed);
}
integrate void
si_reset_adapter(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) {
kprintf("si_reset_adapter\n");
}
#endif
SCI_CLR_INTR(ncr_sc);
}
/*****************************************************************
* Common functions for DMA
****************************************************************/
/*
* Allocate a DMA handle and put it in sc->sc_dma. Prepare
* for DMA transfer. On the Sun3, this means mapping the buffer
* into DVMA space. dvma_mapin() flushes the cache for us.
*/
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 scsi_xfer *xs = sr->sr_xs;
struct buf *bp = sr->sr_xs->bp;
struct si_dma_handle *dh;
int i, xlen;
u_long addr;
trace (("si_dma_alloc()\n"));
#ifdef DIAGNOSTIC
if (sr->sr_dma_hand != NULL)
panic("si_dma_alloc: already have DMA handle");
#endif
addr = (u_long) ncr_sc->sc_dataptr;
debug(("addr=%x, dataptr=%x\n", addr, ncr_sc->sc_dataptr));
xlen = ncr_sc->sc_datalen;
/* Make sure our caller checked sc_min_dma_len. */
if (xlen < MIN_DMA_LEN)
panic("si_dma_alloc: xlen=0x%x\n", xlen);
/*
* Never attempt single transfers of more than 63k, because
* our count register may be only 16 bits (an OBIO adapter).
* This should never happen since already bounded by minphys().
* XXX - Should just segment these...
*/
if (xlen > MAX_DMA_LEN) {
kprintf("si_dma_alloc: excessive xlen=0x%x\n", xlen);
Debugger();
ncr_sc->sc_datalen = xlen = MAX_DMA_LEN;
}
/* 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_addr = (u_char*) addr;
dh->dh_maplen = xlen;
dh->dh_xlen = xlen;
dh->dh_dvma = 0;
/* Copy the "write" flag for convenience. */
if (xs->flags & SCSI_DATA_OUT)
dh->dh_flags |= SIDH_OUT;
#if 1
/*
* If the buffer has the flag B_PHYS, the the address specified
* in the buffer is a user-space address and we need to remap
* this address into kernel space so that using this buffer
* within the interrupt routine will work.
* If it's already a kernel space address, we need to make sure
* that all pages are in-core. the mapin() routine takes care
* of that.
*/
if (bp && (bp->b_flags & B_PHYS))
dh->dh_flags |= SIDH_PHYS;
#endif
if (!bp) {
kprintf("ncr.c: struct buf *bp is null-pointer.\n");
dh->dh_flags = 0;
return;
}
if (bp->b_bcount < 0 || bp->b_bcount > MAX_DMA_LEN) {
kprintf("ncr.c: invalid bcount %d (0x%x)\n",
bp->b_bcount, bp->b_bcount);
dh->dh_flags = 0;
return;
}
dh->dh_dvma = bp->b_data;
#if 0
/*
* mapping of user-space addresses is no longer neccessary, now
* that the vmapbuf/vunmapbuf routines exist. Now the higher-level
* driver already cares for the mapping!
*/
if (bp->b_flags & B_PHYS) {
xdebug(("not mapping in... %x/%x %x\n", bp->b_saveaddr,
bp->b_data, bp->b_bcount));
#ifdef USE_VMAPBUF
dh->dh_addr = bp->b_data;
dh->dh_maplen = bp->b_bcount;
vmapbuf(bp, bp->b_bcount);
dh->dh_dvma = bp->b_data;
#else
dh->dh_dvma = (u_char*)vsdma_mapin(bp);
#endif
xdebug(("addr %x, maplen %d, dvma %x, bcount %d, dir %s\n",
dh->dh_addr, dh->dh_maplen, dh->dh_dvma, bp->b_bcount,
(dh->dh_flags & SIDH_OUT ? "OUT" : "IN")));
}
#endif
/* 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 scsi_xfer *xs = sr->sr_xs;
struct buf *bp = sr->sr_xs->bp;
struct si_dma_handle *dh = sr->sr_dma_hand;
trace (("si_dma_free()\n"));
#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) {
#if 0
debug(("bp->b_flags=0x%x\n", bp->b_flags));
if (bp->b_flags & B_PHYS) {
#ifdef USE_VMAPBUF
kprintf("not unmapping(%x/%x %x/%x %d/%d)...\n",
dh->dh_addr, dh->dh_dvma,
bp->b_saveaddr, bp->b_data,
bp->b_bcount, dh->dh_maplen);
/* vunmapbuf(bp, dh->dh_maplen); */
kprintf("done.\n");
#endif
dh->dh_dvma = 0;
}
#endif
dh->dh_flags = 0;
}
sr->sr_dma_hand = NULL;
}
/*
* REGBUSY and DMABUSY won't collide since the higher-level driver
* issues intr_on/intr_off before/after doing DMA. The only problem
* is to handle RDBUF/WRBUF wrt REGBUSY/DMABUSY
*
* There might be race-conditions, but for now we don't care for them...
*/
int
si_dmaLockBus(ncr_sc, lt)
struct ncr5380_softc *ncr_sc;
int lt; /* Lock-Type */
{
struct si_softc *sc = (void*)ncr_sc;
int timeout = 200; /* wait .2 seconds max. */
trace(("si_dmaLockBus(%x), cold: %d, current: %x\n",
lt, cold, sc->sc_dflags));
#ifdef POLL_MODE
if (cold)
return (0);
#endif
if ((ncr_sc->sc_current != NULL) && (lt == VSDMA_REGBUSY)) {
kprintf("trying to use regs while sc_current is set.\n");
kprintf("lt=%x, fl=%x, cur=%x\n",
lt, sc->sc_dflags, ncr_sc->sc_current);
}
if ((ncr_sc->sc_current == NULL) && (lt != VSDMA_REGBUSY)) {
kprintf("trying to use/prepare DMA without current.\n");
kprintf("lt=%x, fl=%x, cur=%x\n",
lt, sc->sc_dflags, ncr_sc->sc_current);
}
if ((sc->sc_dflags & VSDMA_LOCKED) == 0) {
struct si_softc *sc = (struct si_softc *)ncr_sc;
sc->sc_dflags |= VSDMA_WANTED;
vsbus_lockDMA(sc->sc_cfargs);
sc->sc_dflags = VSDMA_LOCKED | lt;
return (0);
}
#if 1
while ((sc->sc_dflags & VSDMA_LCKTYPE) != lt) {
debug(("busy wait(1)...\n"));
if (--timeout == 0) {
kprintf("timeout in busy-wait(%x %x)\n",
lt, sc->sc_dflags);
sc->sc_dflags &= ~VSDMA_LCKTYPE;
break;
}
delay(1000);
}
debug(("busy wait(1) done.\n"));
sc->sc_dflags |= lt;
#else
if ((sc->sc_dflags & VSDMA_LCKTYPE) != lt) {
switch (lt) {
case VSDMA_RDBUF:
/* sc->sc_dflags |= VSDMA_IWANTED; */
debug(("busy wait(1)...\n"));
while (sc->sc_dflags &
(VSDMA_WRBUF | VSDMA_DMABUSY)) {
if (--timeout == 0) {
kprintf("timeout in busy-wait(1)\n");
sc->sc_dflags &= ~VSDMA_WRBUF;
sc->sc_dflags &= ~VSDMA_DMABUSY;
}
delay(1000);
}
/* sc->sc_dflags &= ~VSDMA_IWANTED; */
debug(("busy wait(1) done.\n"));
sc->sc_dflags |= lt;
break;
case VSDMA_WRBUF:
/* sc->sc_dflags |= VSDMA_IWANTED; */
debug(("busy wait(2)...\n"));
while (sc->sc_dflags &
(VSDMA_RDBUF | VSDMA_DMABUSY)) {
if (--timeout == 0) {
kprintf("timeout in busy-wait(2)\n");
sc->sc_dflags &= ~VSDMA_RDBUF;
sc->sc_dflags &= ~VSDMA_DMABUSY;
}
delay(1000);
}
/* sc->sc_dflags &= ~VSDMA_IWANTED; */
debug(("busy wait(2) done.\n"));
sc->sc_dflags |= lt;
break;
case VSDMA_DMABUSY:
/* sc->sc_dflags |= VSDMA_IWANTED; */
debug(("busy wait(3)...\n"));
while (sc->sc_dflags &
(VSDMA_RDBUF | VSDMA_WRBUF)) {
if (--timeout == 0) {
kprintf("timeout in busy-wait(3)\n");
sc->sc_dflags &= ~VSDMA_RDBUF;
sc->sc_dflags &= ~VSDMA_WRBUF;
}
delay(1000);
}
/* sc->sc_dflags &= ~VSDMA_IWANTED; */
debug(("busy wait(3) done.\n"));
sc->sc_dflags |= lt;
break;
case VSDMA_REGBUSY:
/* sc->sc_dflags |= VSDMA_IWANTED; */
debug(("busy wait(4)...\n"));
while (sc->sc_dflags &
(VSDMA_RDBUF | VSDMA_WRBUF | VSDMA_DMABUSY)) {
if (--timeout == 0) {
kprintf("timeout in busy-wait(4)\n");
sc->sc_dflags &= ~VSDMA_RDBUF;
sc->sc_dflags &= ~VSDMA_WRBUF;
sc->sc_dflags &= ~VSDMA_DMABUSY;
}
delay(1000);
}
/* sc->sc_dflags &= ~VSDMA_IWANTED; */
debug(("busy wait(4) done.\n"));
sc->sc_dflags |= lt;
break;
default:
kprintf("illegal lockType %x in si_dmaLockBus()\n");
}
}
else
kprintf("already locked. (%x/%x)\n", lt, sc->sc_dflags);
#endif
if (sc->sc_dflags & lt) /* successfully locked for this type */
return (0);
kprintf("spurious %x in si_dmaLockBus(%x)\n", lt, sc->sc_dflags);
}
/*
* the lock of this type is no longer needed. If all (internal) locks are
* released, release the DMA bus.
*/
int
si_dmaReleaseBus(ncr_sc, lt)
struct ncr5380_softc *ncr_sc;
int lt; /* Lock-Type */
{
struct si_softc *sc = (void*)ncr_sc;
trace(("si_dmaReleaseBus(%x), cold: %d, current: %x\n",
lt, cold, sc->sc_dflags));
#ifdef POLL_MODE
if (cold)
return (0);
#endif
if ((sc->sc_dflags & VSDMA_LCKTYPE) == lt) {
sc->sc_dflags &= ~lt;
}
else
kprintf("trying to release %x while flags = %x\n", lt,
sc->sc_dflags);
if (sc->sc_dflags == VSDMA_LOCKED) { /* no longer needed */
struct si_softc *sc = (struct si_softc *)ncr_sc;
vsbus_unlockDMA(sc->sc_cfargs);
sc->sc_dflags = 0;
return (0);
}
}
/*
* Just toggle the type of lock without releasing the lock...
* This is usually needed before/after bcopy() to/from DMA-buffer
*/
int
si_dmaToggleLock(ncr_sc, lt1, lt2)
struct ncr5380_softc *ncr_sc;
int lt1, lt2; /* Lock-Type */
{
struct si_softc *sc = (void*)ncr_sc;
#ifdef POLL_MODE
if (cold)
return (0);
#endif
if (((sc->sc_dflags & lt1) != 0) &&
((sc->sc_dflags & lt2) == 0)) {
sc->sc_dflags |= lt2;
sc->sc_dflags &= ~lt1;
return (0);
}
kprintf("cannot toggle locking from %x to %x (current = %x)\n",
lt1, lt2, sc->sc_dflags);
}
/*
* 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;
{
si_dmaReleaseBus(ncr_sc, VSDMA_REGBUSY);
}
/*
* This is called when the bus is idle and we are
* about to start playing with the SBC chip.
*
* VS2000 note: we have four kinds of access which are mutually exclusive:
* - access to the NCR5380 registers
* - access to the HDC9224 registers
* - access to the DMA area
* - doing DMA
*/
void
si_intr_off(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
si_dmaLockBus(ncr_sc, VSDMA_REGBUSY);
}
/*****************************************************************
* VME functions for DMA
****************************************************************/
/*
* 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;
{
trace (("si_dma_setup(ncr_sc) !!!\n"));
/*
* VS2000: nothing to do ...
*/
}
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;
volatile struct si_regs *si = sc->sc_regs;
long data_pa;
int xlen;
trace(("si_dma_start(%x)\n", sr->sr_dma_hand));
/*
* we always transfer from/to base of DMA-area,
* thus the DMA-address is always the same, only size
* and direction matter/differ on VS2000
*/
debug(("ncr_sc->sc_datalen = %d\n", ncr_sc->sc_datalen));
xlen = ncr_sc->sc_datalen;
dh->dh_xlen = xlen;
/*
* VS2000 has a fixed 16KB-area where DMA is restricted to.
* All DMA-addresses are relative to this base: KA410_DMA_BASE
* Thus we need to copy the data into this area when writing,
* or copy from this area when reading. (kind of bounce-buffer)
*/
/* Set direction (send/recv) */
if (dh->dh_flags & SIDH_OUT) {
/*
* We know that we are called while intr_off (regs locked)
* thus we toggle the lock from REGBUSY to WRBUF
* also we set the BLOCKIT flag, so that the locking of
* the DMA bus won't be released to the HDC9224...
*/
debug(("preparing msg-out (bcopy)\n"));
si_dmaToggleLock(ncr_sc, VSDMA_REGBUSY, VSDMA_WRBUF);
bcopy(dh->dh_dvma, sc->sc_dbase, xlen);
si_dmaToggleLock(ncr_sc, VSDMA_WRBUF, VSDMA_REGBUSY);
*sc->sc_ddreg = DMA_DIR_OUT;
}
else {
debug(("preparing data-in (bzero)\n"));
/* bzero(sc->sc_dbase, xlen); */
*sc->sc_ddreg = DMA_DIR_IN;
}
sc->sc_dflags |= VSDMA_BLOCKED;
*sc->sc_dareg = DMA_ADDR_HBYTE; /* high byte (6 bits) */
*sc->sc_dareg = DMA_ADDR_LBYTE; /* low byte */
*sc->sc_dcreg = 0 - xlen; /* bertram XXX */
#ifdef DEBUG
if (si_debug & 2) {
kprintf("si_dma_start: dh=0x%x, pa=0x%x, xlen=%d, creg=0x%x\n",
dh, data_pa, xlen, *sc->sc_dcreg);
}
#endif
#ifdef POLL_MODE
debug(("dma_start: cold=%d\n", cold));
if (cold) {
*sc->intmsk &= ~sc->intbit;
*sc->intclr = sc->intbit;
}
else
*sc->intmsk |= sc->intbit;
#endif
/*
* Acknowledge the phase change. (After DMA setup!)
* Put the SBIC into DMA mode, and start the transfer.
*/
si_dmaToggleLock(ncr_sc, VSDMA_REGBUSY, VSDMA_DMABUSY);
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 */
}
ncr_sc->sc_state |= NCR_DOINGDMA;
/*
* having a delay (eg. kprintf) here, seems to solve the problem.
* Isn't that strange ????
* Maybe the higher-level driver accesses one of the registers of
* the controller while DMA is in progress. Having a long enough
* delay here might prevent/delay this access until DMA bus is
* free again...
*
* The instruction ++++ kprintf("DMA started.\n"); ++++
* is long/slow enough, to make the SSCI driver work. Thus we
* try to find a delay() long/slow enough to do the same. The
* argument to this delay is relative to the transfer-count.
*/
delay(3*xlen/4); /* XXX solve this problem!!! XXX */
#ifdef DEBUG
if (si_debug & 2) {
kprintf("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;
{
trace (("si_vme_dma_eop() !!!\n"));
/* Not needed - DMA was stopped prior to examining sci_csr */
}
/*
* si_dma_stop() has now become almost a nop-routine, since DMA-buffer
* has already been read within si_intr(), so there's nothing left to do.
*/
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;
volatile struct si_regs *si = sc->sc_regs;
int resid, ntrans;
if ((ncr_sc->sc_state & NCR_DOINGDMA) == 0) {
#ifdef DEBUG
kprintf("si_dma_stop: dma not running\n");
#endif
return;
}
ncr_sc->sc_state &= ~NCR_DOINGDMA;
/* Note that timeout may have set the error flag. */
if (ncr_sc->sc_state & NCR_ABORTING) {
kprintf("si_dma_stop: timeout?\n");
goto out;
}
/*
* Now try to figure out how much actually transferred
*/
si_dmaLockBus(ncr_sc, VSDMA_DMABUSY);
si_dmaToggleLock(ncr_sc, VSDMA_DMABUSY, VSDMA_REGBUSY);
resid = *sc->sc_dcreg;
/*
* XXX: don't correct at two places !!!
*/
if (resid == 1 && sc->sc_xflags) {
resid = 0;
}
ntrans = dh->dh_xlen + resid;
if (resid != 0)
kprintf("resid=%d, xlen=%d, ntrans=%d\n",
resid, dh->dh_xlen, ntrans);
#ifdef DEBUG
if (si_debug & 2) {
kprintf("si_dma_stop: resid=0x%x ntrans=0x%x\n",
resid, ntrans);
}
#endif
if (ntrans < MIN_DMA_LEN) {
kprintf("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");
/*
* On VS2000 in case of a READ-operation, we must now copy
* the buffer-contents to the destination-address!
*/
if ((dh->dh_flags & SIDH_OUT) == 0 &&
(dh->dh_flags & SIDH_DONE) == 0) {
kprintf("DMA buffer not yet copied.\n");
si_dmaToggleLock(ncr_sc, VSDMA_REGBUSY, VSDMA_RDBUF);
bcopy(sc->sc_dbase, dh->dh_dvma, ntrans);
si_dmaToggleLock(ncr_sc, VSDMA_RDBUF, VSDMA_REGBUSY);
}
si_dmaReleaseBus(ncr_sc, VSDMA_REGBUSY);
/* Adjust data pointer */
ncr_sc->sc_dataptr += ntrans;
ncr_sc->sc_datalen -= ntrans;
out:
si_dmaLockBus(ncr_sc, VSDMA_DMABUSY);
/* Put SBIC back in PIO mode. */
*ncr_sc->sci_mode &= ~(SCI_MODE_DMA | SCI_MODE_DMA_IE);
*ncr_sc->sci_icmd = 0;
si_dmaReleaseBus(ncr_sc, VSDMA_DMABUSY);
}
/*
* Poll (spin-wait) for DMA completion.
* Called right after xx_dma_start(), and
* xx_dma_stop() will be called next.
*/
void
si_dma_poll(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 i, timeout;
if (! cold)
kprintf("spurious call of DMA-poll ???");
#ifdef POLL_MODE
delay(10000);
trace(("si_dma_poll(%x)\n", *sc->sc_dcreg));
/*
* interrupt-request has been cleared by dma_start, thus
* we do nothing else but wait for the intreq to reappear...
*/
timeout = 5000;
for (i=0; i<timeout; i++) {
if (*sc->intreq & sc->intbit)
break;
delay(100);
}
if ((*sc->intreq & sc->intbit) == 0) {
kprintf("si: DMA timeout (while polling)\n");
/* Indicate timeout as MI code would. */
sr->sr_flags |= SR_OVERDUE;
}
#endif
return;
}
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