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NetBSD/sys/arch/sun3/dev/ncr_si.c
gwr 5d5c8d0d4b Latest, greatest version of the new NCR driver. 
DMA works!  Interrupts work!  Disconnect/reselect works!
To be paranoid, leave that all disabled for now...
1995-11-17 23:27:41 +00:00

1292 lines
32 KiB
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/* $NetBSD: ncr_si.c,v 1.2 1995/11/17 23:27:52 gwr Exp $ */
/*
* 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.
*/
#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 <sys/proc.h>
#include <sys/user.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_debug.h>
#include <scsi/scsiconf.h>
#include <machine/autoconf.h>
#include <machine/isr.h>
#include <machine/obio.h>
#include <machine/dvma.h>
#define DEBUG XXX
#if 0 /* XXX - not yet... */
#include <dev/ic/ncr5380reg.h>
#include <dev/ic/ncr5380var.h>
#else
#include "ncr5380reg.h"
#include "ncr5380var.h"
#endif
#include "ncr_sireg.h"
#include "am9516.h"
/*
* 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?)
*/
#define MAX_DMA_LEN 0xE000
/*
* How many uS. to delay after touching the am9516 UDC.
*/
#define UDC_WAIT_USEC 5
#ifdef DEBUG
int si_debug = 0;
static int si_link_flags = 0 /* | SDEV_DB2 */ ;
#endif
/*
* This structure is used to keep track of mapped 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) */
u_char * dh_addr; /* KVA of start of buffer */
int dh_maplen; /* Length of KVA mapping. */
long dh_dvma; /* VA of buffer in DVMA space */
/* DMA command block for the OBIO controller. */
struct udc_table dh_cmd;
};
/*
* 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;
int sc_adapter_type;
int sc_adapter_iv_am; /* int. vec + address modifier */
struct si_dma_handle *sc_dma;
int sc_xlen; /* length of current DMA segment. */
};
/* Options. Interesting values are: 1,3,7 */
int si_options = 0;
#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 */
/* How long to wait for DMA before declaring an error. */
int si_dma_intr_timo = 500; /* ticks (sec. X 100) */
static char si_name[] = "si";
static int si_match();
static void si_attach();
static int si_intr(void *arg);
static void si_reset_adapter(struct ncr5380_softc *sc);
static void si_minphys(struct buf *bp);
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_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 *));
void si_obio_dma_setup __P((struct ncr5380_softc *));
void si_obio_dma_start __P((struct ncr5380_softc *));
void si_obio_dma_eop __P((struct ncr5380_softc *));
void si_obio_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_sicd = {
NULL, si_name, si_match, si_attach,
DV_DULL, sizeof(struct si_softc), NULL, 0,
};
static int
si_print(aux, name)
void *aux;
char *name;
{
if (name != NULL)
printf("%s: scsibus ", name);
return UNCONF;
}
static int
si_match(parent, vcf, args)
struct device *parent;
void *vcf, *args;
{
struct cfdata *cf = vcf;
struct confargs *ca = args;
int x, probe_addr;
/* Default interrupt priority always splbio==2 */
if (ca->ca_intpri == -1)
ca->ca_intpri = 2;
if ((cpu_machine_id == SUN3_MACH_50) ||
(cpu_machine_id == SUN3_MACH_60) )
{
/* Sun3/50 or Sun3/60 have only OBIO "si" */
if (ca->ca_bustype != BUS_OBIO)
return(0);
if (ca->ca_paddr == -1)
ca->ca_paddr = OBIO_NCR_SCSI;
/* OK... */
} else {
/* Other Sun3 models may have VME "si" or "sc" */
if (ca->ca_bustype != BUS_VME16)
return (0);
if (ca->ca_paddr == -1)
return (0);
/* OK... */
}
/* Make sure there is something there... */
x = bus_peek(ca->ca_bustype, ca->ca_paddr + 1, 1);
if (x == -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.
*/
if (ca->ca_bustype == BUS_VME16) {
/* Note, the "si" board should NOT respond here. */
x = bus_peek(ca->ca_bustype, ca->ca_paddr + 0x801, 1);
if (x != -1)
return(0);
}
return (1);
}
static void
si_attach(parent, self, args)
struct device *parent, *self;
void *args;
{
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 = args;
int i;
switch (ca->ca_bustype) {
case BUS_OBIO:
regs = (struct si_regs *)
obio_alloc(ca->ca_paddr, sizeof(*regs));
break;
case BUS_VME16:
regs = (struct si_regs *)
bus_mapin(ca->ca_bustype, ca->ca_paddr, sizeof(*regs));
break;
default:
printf("unknown\n");
return;
}
printf("\n");
/*
* Fill in the prototype scsi_link.
*/
ncr_sc->sc_link.adapter_softc = sc;
ncr_sc->sc_link.adapter_target = 7;
ncr_sc->sc_link.adapter = &si_ops;
ncr_sc->sc_link.device = &si_dev;
/*
* Initialize fields used by the MI code
*/
ncr_sc->sci_r0 = &regs->sci.sci_r0;
ncr_sc->sci_r1 = &regs->sci.sci_r1;
ncr_sc->sci_r2 = &regs->sci.sci_r2;
ncr_sc->sci_r3 = &regs->sci.sci_r3;
ncr_sc->sci_r4 = &regs->sci.sci_r4;
ncr_sc->sci_r5 = &regs->sci.sci_r5;
ncr_sc->sci_r6 = &regs->sci.sci_r6;
ncr_sc->sci_r7 = &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;
ncr_sc->sc_intr_on = NULL;
ncr_sc->sc_intr_off = NULL;
if (ca->ca_bustype == BUS_VME16) {
ncr_sc->sc_dma_setup = si_vme_dma_setup;
ncr_sc->sc_dma_start = si_vme_dma_start;
ncr_sc->sc_dma_eop = si_vme_dma_stop;
ncr_sc->sc_dma_stop = si_vme_dma_stop;
if (si_options & SI_DO_RESELECT) {
/*
* Need to enable interrupts (and DMA!)
* on this H/W for reselect to work.
*/
ncr_sc->sc_intr_on = si_vme_intr_on;
ncr_sc->sc_intr_off = si_vme_intr_off;
}
} else {
ncr_sc->sc_dma_setup = si_obio_dma_setup;
ncr_sc->sc_dma_start = si_obio_dma_start;
ncr_sc->sc_dma_eop = si_obio_dma_stop;
ncr_sc->sc_dma_stop = si_obio_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.
*/
/* Need DVMA-capable memory for the UDC command blocks. */
i = SCI_OPENINGS * sizeof(struct si_dma_handle);
sc->sc_dma = (struct si_dma_handle *) dvma_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;
sc->sc_adapter_type = ca->ca_bustype;
/* Now ready for interrupts. */
if (ca->ca_bustype == BUS_OBIO) {
isr_add_autovect(si_intr, (void *)sc,
ca->ca_intpri);
} else {
isr_add_vectored(si_intr, (void *)sc,
ca->ca_intpri, ca->ca_intvec);
sc->sc_adapter_iv_am =
VME_SUPV_DATA_24 | (ca->ca_intvec & 0xFF);
}
#ifdef DEBUG
if (si_debug)
printf("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), si_print);
}
static void
si_minphys(struct buf *bp)
{
if (bp->b_bcount > MAX_DMA_LEN) {
#ifdef DEBUG
if (si_debug) {
printf("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_intr(void *arg)
{
struct si_softc *sc = arg;
volatile struct si_regs *si = sc->sc_regs;
int dma_error, claimed;
u_short csr;
claimed = 0;
dma_error = 0;
/* SBC interrupt? DMA interrupt? */
csr = si->si_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;
volatile struct si_regs *si = sc->sc_regs;
#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.
*/
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;
if (sc->sc_adapter_type == BUS_VME16) {
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;
}
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 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 ((si_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);
/*
* 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) {
printf("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_dvma = 0;
/* Copy the "write" flag for convenience. */
if (xs->flags & SCSI_DATA_OUT)
dh->dh_flags |= SIDH_OUT;
#if 0
/*
* Some machines might not need to remap B_PHYS buffers.
* The sun3 does not map B_PHYS buffers into DVMA space,
* (they are mapped into normal KV space) so on the sun3
* we must always remap to a DVMA address here. Re-map is
* cheap anyway, because it's done by segments, not pages.
*/
if (xs->bp && (xs->bp->b_flags & B_PHYS))
dh->dh_flags |= SIDH_PHYS;
#endif
dh->dh_dvma = (u_long) dvma_mapin((char *)addr, xlen);
if (!dh->dh_dvma) {
/* Can't remap segment */
printf("si_dma_alloc: can't remap %x/%x\n",
dh->dh_addr, dh->dh_maplen);
dh->dh_flags = 0;
return;
}
/* success */
sr->sr_dma_hand = dh;
return;
}
void
si_dma_free(ncr_sc)
struct ncr5380_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) {
/* XXX - Should separate allocation and mapping. */
/* Give back the DVMA space. */
dvma_mapout((caddr_t)dh->dh_dvma, dh->dh_maplen);
dh->dh_dvma = 0;
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 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 tmo, csr_mask;
/* 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 (;;) {
if (si->si_csr & csr_mask)
break;
if (--tmo <= 0) {
printf("si: DMA timeout (while polling)\n");
/* 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", si->si_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_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;
si_vme_dma_setup(ncr_sc);
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
* 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_vme_dma_setup(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
struct si_softc *sc = (struct si_softc *)ncr_sc;
volatile struct si_regs *si = sc->sc_regs;
/* Reset the FIFO */
si->si_csr &= ~SI_CSR_FIFO_RES; /* active low */
si->si_csr |= SI_CSR_FIFO_RES;
/* Set direction (assume recv here) */
si->si_csr &= ~SI_CSR_SEND;
/* Assume worst alignment */
si->si_csr |= SI_CSR_BPCON;
si->dma_addrh = 0;
si->dma_addrl = 0;
si->dma_counth = 0;
si->dma_countl = 0;
/* Clear FIFO counter. (also hits dma_count) */
si->fifo_cnt_hi = 0;
si->fifo_count = 0;
}
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;
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)
panic("si_dma_start: bad pa=0x%x", data_pa);
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=0x%x, pa=0x%x, xlen=%d\n",
dh, data_pa, xlen);
}
#endif
/*
* Set up the DMA controller.
*/
si->si_csr &= ~SI_CSR_FIFO_RES; /* active low */
si->si_csr |= SI_CSR_FIFO_RES;
/* Set direction (send/recv) */
if (dh->dh_flags & SIDH_OUT) {
si->si_csr |= SI_CSR_SEND;
} else {
si->si_csr &= ~SI_CSR_SEND;
}
if (data_pa & 2) {
si->si_csr |= SI_CSR_BPCON;
} else {
si->si_csr &= ~SI_CSR_BPCON;
}
si->dma_addrh = (ushort)(data_pa >> 16);
si->dma_addrl = (ushort)(data_pa & 0xFFFF);
si->dma_counth = (ushort)(xlen >> 16);
si->dma_countl = (ushort)(xlen & 0xFFFF);
#if 1
/* Set it anyway, even though dma_count hits it? */
si->fifo_cnt_hi = (ushort)(xlen >> 16);
si->fifo_count = (ushort)(xlen & 0xFFFF);
#endif
#ifdef DEBUG
if (si->fifo_count != xlen) {
printf("si_dma_start: fifo_count=0x%x, xlen=0x%x\n",
si->fifo_count, xlen);
Debugger();
}
#endif
/*
* 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;
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_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
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 */
if (si->si_csr & (SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR)) {
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_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 needs to be incremented. This is
* true if we have not transferred either all data
* or no data. XXX - from Matt Jacob
*/
resid = si->fifo_count & 0xFFFF;
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 < MIN_DMA_LEN) {
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
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;
}
/*****************************************************************
* OBIO functions for DMA
****************************************************************/
static __inline__ void
si_obio_udc_write(si, regnum, value)
volatile struct si_regs *si;
int regnum, value;
{
delay(UDC_WAIT_USEC);
si->udc_addr = regnum;
delay(UDC_WAIT_USEC);
si->udc_data = value;
}
static __inline__ int
si_obio_udc_read(si, regnum)
volatile struct si_regs *si;
int regnum;
{
delay(UDC_WAIT_USEC);
si->udc_addr = regnum;
delay(UDC_WAIT_USEC);
return (si->udc_data);
}
/*
* 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.
*
* The OBIO "si" IGNORES any attempt to set the FIFO count
* register after the SCSI bus goes into any DATA phase, so
* this function has to setup the evil FIFO logic.
*/
void
si_obio_dma_setup(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
struct si_softc *sc = (struct si_softc *)ncr_sc;
volatile struct si_regs *si = sc->sc_regs;
struct sci_req *sr;
struct si_dma_handle *dh;
int send = 0;
int xlen = 0;
/* Let this work even without a dma hand, for testing... */
if ((sr = ncr_sc->sc_current) != NULL) {
if ((dh = sr->sr_dma_hand) != NULL) {
send = dh->dh_flags & SIDH_OUT;
xlen = ncr_sc->sc_datalen;
xlen &= ~1;
}
}
#ifdef DEBUG
if (si_debug) {
printf("si_dma_setup: send=%d xlen=%d\n", send, xlen);
}
#endif
/* Reset the FIFO */
si->si_csr &= ~SI_CSR_FIFO_RES; /* active low */
si->si_csr |= SI_CSR_FIFO_RES;
/* Set direction (send/recv) */
if (send) {
si->si_csr |= SI_CSR_SEND;
} else {
si->si_csr &= ~SI_CSR_SEND;
}
/* Set the FIFO counter. */
si->fifo_count = xlen;
#ifdef DEBUG
if ((si->fifo_count > xlen) || (si->fifo_count < (xlen - 1))) {
printf("si_dma_setup: fifo_count=0x%x, xlen=0x%x\n",
si->fifo_count, xlen);
Debugger();
}
#endif
}
void
si_obio_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;
struct udc_table *cmd;
long data_pa, cmd_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)
panic("si_dma_start: bad pa=0x%x", data_pa);
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=0x%x, pa=0x%x, xlen=%d\n",
dh, data_pa, xlen);
}
#endif
/*
* Set up the DMA controller.
* Already set FIFO count in dma_setup.
*/
#ifdef DEBUG
if ((si->fifo_count > xlen) ||
(si->fifo_count < (xlen - 1)))
{
printf("si_dma_start: fifo_count=0x%x, xlen=0x%x\n",
si->fifo_count, xlen);
Debugger();
}
#endif
/*
* The OBIO controller needs a command block.
*/
cmd = &dh->dh_cmd;
cmd->addrh = ((data_pa & 0xFF0000) >> 8) | UDC_ADDR_INFO;
cmd->addrl = data_pa & 0xFFFF;
cmd->count = xlen / 2; /* bytes -> words */
cmd->cmrh = UDC_CMR_HIGH;
if (dh->dh_flags & SIDH_OUT) {
cmd->cmrl = UDC_CMR_LSEND;
cmd->rsel = UDC_RSEL_SEND;
} else {
cmd->cmrl = UDC_CMR_LRECV;
cmd->rsel = UDC_RSEL_RECV;
}
/* Tell the DMA chip where the control block is. */
cmd_pa = dvma_kvtopa((long)cmd, BUS_OBIO);
si_obio_udc_write(si, UDC_ADR_CAR_HIGH,
(cmd_pa & 0xff0000) >> 8);
si_obio_udc_write(si, UDC_ADR_CAR_LOW,
(cmd_pa & 0xffff));
/* Tell the chip to be a DMA master. */
si_obio_udc_write(si, UDC_ADR_MODE, UDC_MODE);
/* Tell the chip to interrupt on error. */
si_obio_udc_write(si, UDC_ADR_COMMAND, UDC_CMD_CIE);
/* Finally, give the UDC a "start chain" command. */
si_obio_udc_write(si, UDC_ADR_COMMAND, UDC_CMD_STRT_CHN);
/*
* 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 */
}
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_obio_dma_eop(ncr_sc)
struct ncr5380_softc *ncr_sc;
{
/* Not needed - DMA was stopped prior to examining sci_csr */
}
void
si_obio_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, tmo, udc_cnt;
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;
if (si->si_csr & (SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR)) {
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_reset_adapter(ncr_sc);
}
/* Note that timeout may have set the error flag. */
if (ncr_sc->sc_state & NCR_ABORTING)
goto out;
/*
* After a read, wait for the FIFO to empty.
* Note: this only works on the OBIO version.
*/
if ((dh->dh_flags & SIDH_OUT) == 0) {
tmo = 200000; /* X10 = 2 sec. */
for (;;) {
if (si->si_csr & SI_CSR_FIFO_EMPTY)
break;
if (--tmo <= 0) {
printf("si: dma fifo did not empty, reset\n");
ncr_sc->sc_state |= NCR_ABORTING;
/* si_reset_adapter(ncr_sc); */
goto out;
}
delay(10);
}
}
/*
* Now try to figure out how much actually transferred
*
* The fifo_count might not reflect how many bytes were
* actually transferred for VME.
*/
resid = si->fifo_count & 0xFFFF;
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 < MIN_DMA_LEN) {
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) {
/* If odd transfer count, grab last byte by hand. */
if (ntrans & 1) {
ncr_sc->sc_dataptr[-1] =
(si->fifo_data & 0xff00) >> 8;
goto out;
}
/* UDC might not have transfered the last word. */
udc_cnt = si_obio_udc_read(si, UDC_ADR_COUNT);
if (((udc_cnt * 2) - resid) == 2) {
ncr_sc->sc_dataptr[-2] =
(si->fifo_data & 0xff00) >> 8;
ncr_sc->sc_dataptr[-1] =
(si->fifo_data & 0x00ff);
}
}
out:
/* Reset the UDC. */
si_obio_udc_write(si, UDC_ADR_COMMAND, UDC_CMD_RESET);
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;
}
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