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freebsd-dev/sys/dev/ct/ct.c
Yoshihiro Takahashi 5c936ade5b Correct typo.
2001-06-14 11:09:11 +00:00

961 lines
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/* $FreeBSD$ */
/* $NecBSD: ct.c,v 1.13 1999/07/23 20:54:00 honda Exp $ */
/* $NetBSD$ */
#define CT_DEBUG
#define CT_USE_CCSEQ
/*
* [NetBSD for NEC PC-98 series]
* Copyright (c) 1994, 1995, 1996, 1997, 1998, 1999
* NetBSD/pc98 porting staff. All rights reserved.
*
* Copyright (c) 1994, 1995, 1996, 1997, 1998, 1999
* Naofumi HONDA. 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 author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/disklabel.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <sys/device_port.h>
#include <sys/errno.h>
#include <vm/vm.h>
#ifdef __NetBSD__
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <dev/scsipi/scsi_disk.h>
#include <machine/dvcfg.h>
#include <machine/physio_proc.h>
#include <i386/Cbus/dev/scsi_low.h>
#include <dev/ic/wd33c93reg.h>
#include <i386/Cbus/dev/ct/ctvar.h>
#endif /* __NetBSD__ */
#ifdef __FreeBSD__
#include <machine/bus.h>
#include <machine/dvcfg.h>
#include <machine/physio_proc.h>
#include <cam/scsi/scsi_low.h>
#include <dev/ic/wd33c93reg.h>
#include <dev/ct/ctvar.h>
#endif /* __FreeBSD__ */
/***************************************************
* DEBUG
***************************************************/
#define CT_NTARGETS 8
#define CT_NLUNS 8
#define CT_RESET_DEFAULT 2000
#ifndef DDB
#define Debugger() panic("should call debugger here (ct.c)")
#else /* ! DDB */
#ifdef __FreeBSD__
#define Debugger() Debugger("ct")
#endif /* __FreeBSD__ */
#endif
#ifdef CT_DEBUG
int ct_debug;
#endif /* CT_DEBUG */
/***************************************************
* default data
***************************************************/
u_int8_t cthw_cmdlevel[256] = {
/* 0 1 2 3 4 5 6 7 8 9 A B C E D F */
/*0*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,1 ,0 ,1 ,0 ,0 ,0 ,0 ,0 ,
/*1*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*2*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,1 ,0 ,1 ,0 ,0 ,0 ,0 ,0 ,
/*3*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*4*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*5*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*6*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*7*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*8*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*9*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*A*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*B*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*C*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*D*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*E*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
/*F*/0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
};
/* default synch data table */
/* A 10 6.6 5.0 4.0 3.3 2.8 2.5 2.0 M/s */
/* X 100 150 200 250 300 350 400 500 ns */
static struct ct_synch_data ct_synch_data_20MHz[] = {
{25, 0xa0}, {37, 0xb0}, {50, 0x20}, {62, 0xd0}, {75, 0x30},
{87, 0xf0}, {100, 0x40}, {125, 0x50}, {0, 0}
};
extern unsigned int delaycount;
/*****************************************************************
* Interface functions
*****************************************************************/
static int ct_xfer __P((struct ct_softc *, u_int8_t *, int, int));
static void ct_io_xfer __P((struct ct_softc *));
static __inline int ct_reselected __P((struct ct_softc *));
static void ct_phase_error __P((struct ct_softc *, u_int8_t));
static int ct_start_selection __P((struct ct_softc *, struct slccb *));
static int ct_msg __P((struct ct_softc *, struct targ_info *, u_int));
static int ct_world_start __P((struct ct_softc *, int));
static __inline void cthw_phase_bypass __P((struct ct_softc *, u_int8_t));
static int cthw_chip_reset __P((bus_space_tag_t, bus_space_handle_t, int, int));
static void cthw_bus_reset __P((struct ct_softc *));
static int ct_nexus __P((struct ct_softc *, struct targ_info *));
static void cthw_attention __P((struct ct_softc *));
static int ct_targ_init __P((struct ct_softc *, struct targ_info *));
struct scsi_low_funcs ct_funcs = {
SC_LOW_INIT_T ct_world_start,
SC_LOW_BUSRST_T cthw_bus_reset,
SC_LOW_TARG_INIT_T ct_targ_init,
SC_LOW_SELECT_T ct_start_selection,
SC_LOW_NEXUS_T ct_nexus,
SC_LOW_ATTEN_T cthw_attention,
SC_LOW_MSG_T ct_msg,
SC_LOW_POLL_T ctintr,
NULL, /* SC_LOW_POWER_T cthw_power, */
};
/**************************************************
* HW functions
**************************************************/
static __inline void
cthw_phase_bypass(ct, ph)
struct ct_softc *ct;
u_int8_t ph;
{
bus_space_tag_t bst = ct->sc_iot;
bus_space_handle_t bsh = ct->sc_ioh;
ct_cr_write_1(bst, bsh, wd3s_cph, ph);
ct_cr_write_1(bst, bsh, wd3s_cmd, WD3S_SELECT_ATN_TFR);
ct->sc_satgo = CT_SAT_GOING;
}
static void
cthw_bus_reset(ct)
struct ct_softc *ct;
{
/*
* wd33c93 does not have bus reset function.
*/
if (ct->ct_bus_reset != NULL)
((*ct->ct_bus_reset) (ct));
}
static int
cthw_chip_reset(bst, bsh, chipclk, hostid)
bus_space_tag_t bst;
bus_space_handle_t bsh;
int chipclk, hostid;
{
#define CT_SELTIMEOUT_20MHz_REGV (0x80)
u_int8_t aux, regv;
u_int seltout;
int wc;
/* issue abort cmd */
ct_cr_write_1(bst, bsh, wd3s_cmd, WD3S_ABORT);
delay(1000); /* 1ms wait */
(void) ct_stat_read_1(bst, bsh);
(void) ct_cr_read_1(bst, bsh, wd3s_stat);
/* setup chip registers */
regv = 0;
seltout = CT_SELTIMEOUT_20MHz_REGV;
switch (chipclk)
{
case 10:
seltout = (seltout * chipclk) / 20;
regv = 0;
break;
case 15:
seltout = (seltout * chipclk) / 20;
regv = IDR_FS_12_15;
break;
case 20:
seltout = (seltout * chipclk) / 20;
regv = IDR_FS_16_20;
break;
default:
panic("ct: illegal chip clk rate\n");
break;
}
regv |= IDR_EHP | hostid;
ct_cr_write_1(bst, bsh, wd3s_oid, regv);
ct_cr_write_1(bst, bsh, wd3s_cmd, WD3S_RESET);
for (wc = CT_RESET_DEFAULT; wc > 0; wc --)
{
aux = ct_stat_read_1(bst, bsh);
if (aux != 0xff && (aux & STR_INT))
{
if (ct_cr_read_1(bst, bsh, wd3s_stat) == 0)
break;
ct_cr_write_1(bst, bsh, wd3s_cmd, WD3S_RESET);
}
delay(1);
}
if (wc == 0)
return ENXIO;
ct_cr_write_1(bst, bsh, wd3s_tout, seltout);
ct_cr_write_1(bst, bsh, wd3s_sid, SIDR_RESEL);
ct_cr_write_1(bst, bsh, wd3s_ctrl, CR_DEFAULT);
ct_cr_write_1(bst, bsh, wd3s_synch, 0);
(void) ct_stat_read_1(bst, bsh);
(void) ct_cr_read_1(bst, bsh, wd3s_stat);
return 0;
}
/**************************************************
* Attach & Probe
**************************************************/
int
ctprobesubr(bst, bsh, dvcfg, hsid, chipclk)
bus_space_tag_t bst;
bus_space_handle_t bsh;
u_int dvcfg, chipclk;
int hsid;
{
#if 0
if ((ct_stat_read_1(bst, bsh) & STR_BUSY) != 0)
return 0;
#endif
if (cthw_chip_reset(bst, bsh, chipclk, hsid) != 0)
return 0;
return 1;
}
int
ctprint(aux, name)
void *aux;
const char *name;
{
if (name != NULL)
printf("%s: scsibus ", name);
return UNCONF;
}
void
ctattachsubr(ct)
struct ct_softc *ct;
{
struct scsi_low_softc *slp = &ct->sc_sclow;
ct->sc_wc = delaycount * 2000; /* 2 sec */
slp->sl_funcs = &ct_funcs;
(void) scsi_low_attach(slp, 2, CT_NTARGETS, CT_NLUNS,
sizeof(struct ct_targ_info));
}
/**************************************************
* SCSI LOW interface functions
**************************************************/
static void
cthw_attention(ct)
struct ct_softc *ct;
{
bus_space_tag_t bst = ct->sc_iot;
bus_space_handle_t bsh = ct->sc_ioh;
if ((ct_stat_read_1(bst, bsh) & STR_BUSY) != 0)
{
ct->sc_atten = 1;
return;
}
ct_cr_write_1(bst, bsh, wd3s_cmd, WD3S_ASSERT_ATN);
delay(10);
if ((ct_stat_read_1(bst, bsh) & STR_LCI) != 0)
{
ct->sc_atten = 1;
return;
}
ct->sc_atten = 0;
}
static int
ct_targ_init(ct, ti)
struct ct_softc *ct;
struct targ_info *ti;
{
struct ct_targ_info *cti = (void *) ti;
if (ct->sc_chiprev == CT_WD33C93_A)
{
ti->ti_maxsynch.period = 200 / 4; /* 5MHz */
ti->ti_maxsynch.offset = 8;
}
else
{
ti->ti_maxsynch.period = 100 / 4; /* 10MHz */
ti->ti_maxsynch.offset = 12;
}
cti->cti_syncreg = 0;
return 0;
}
static int
ct_world_start(ct, fdone)
struct ct_softc *ct;
int fdone;
{
struct scsi_low_softc *slp = &ct->sc_sclow;
bus_space_tag_t bst = ct->sc_iot;
bus_space_handle_t bsh = ct->sc_ioh;
intrmask_t s;
if (ct->sc_sdp == NULL)
ct->sc_sdp = &ct_synch_data_20MHz[0];
slp->sl_cfgflags |= CFG_MSGUNIFY;
if (slp->sl_cfgflags & CFG_NOPARITY)
ct->sc_creg = CR_DEFAULT;
else
ct->sc_creg = CR_DEFAULT_HP;
if (ct->sc_dma & CT_DMA_DMASTART)
(*ct->ct_dma_xfer_stop) (ct);
if (ct->sc_dma & CT_DMA_PIOSTART)
(*ct->ct_pio_xfer_stop) (ct);
ct->sc_dma = 0;
ct->sc_atten = 0;
s = splcam();
cthw_chip_reset(bst, bsh, ct->sc_chipclk, slp->sl_hostid);
scsi_low_bus_reset(slp);
cthw_chip_reset(bst, bsh, ct->sc_chipclk, slp->sl_hostid);
splx(s);
SOFT_INTR_REQUIRED(slp);
return 0;
}
static int
ct_start_selection(ct, cb)
struct ct_softc *ct;
struct slccb *cb;
{
struct scsi_low_softc *slp = &ct->sc_sclow;
bus_space_tag_t bst = ct->sc_iot;
bus_space_handle_t bsh = ct->sc_ioh;
struct targ_info *ti = slp->sl_nexus;
struct lun_info *li = ti->ti_li;
int s;
u_int8_t cmd;
ct->sc_atten = 0;
if (cthw_cmdlevel[slp->sl_scp.scp_cmd[0]] != 0)
{
/*
* This completely violates scsi protocols,
* however some old devices do not work
* properly with scsi attentions.
*/
if ((li->li_flags & SCSI_LOW_DISC) != 0)
cmd = WD3S_SELECT_ATN_TFR;
else
cmd = WD3S_SELECT_NO_ATN_TFR;
ct->sc_satgo = CT_SAT_GOING;
}
else
{
cmd = WD3S_SELECT_ATN;
ct->sc_satgo = 0;
}
if ((ct_stat_read_1(bst, bsh) & STR_BUSY) != 0)
return SCSI_LOW_START_FAIL;
scsi_low_cmd(slp, ti);
if ((ct->sc_satgo & CT_SAT_GOING) != 0)
ct_write_cmds(bst, bsh,
slp->sl_scp.scp_cmd, slp->sl_scp.scp_cmdlen);
s = splhigh();
if ((ct_stat_read_1(bst, bsh) & STR_BUSY) == 0)
{
/* XXX:
* Reload a lun again here.
*/
ct_cr_write_1(bst, bsh, wd3s_lun, li->li_lun);
ct_cr_write_1(bst, bsh, wd3s_cmd, cmd);
if ((ct_stat_read_1(bst, bsh) & STR_LCI) == 0)
{
splx(s);
SCSI_LOW_SETUP_PHASE(ti, PH_SELSTART);
return SCSI_LOW_START_OK;
}
}
splx(s);
return SCSI_LOW_START_FAIL;
}
static int
ct_msg(ct, ti, msg)
struct ct_softc *ct;
struct targ_info *ti;
u_int msg;
{
struct lun_info *li = ti->ti_li;
struct ct_targ_info *cti = (void *) ti;
struct ct_synch_data *csp = ct->sc_sdp;
u_int offset, period;
if (msg != SCSI_LOW_MSG_SYNCH)
return 0;
offset = ti->ti_maxsynch.offset;
period = ti->ti_maxsynch.period;
for ( ; csp->cs_period != 0; csp ++)
{
if (period == csp->cs_period)
break;
}
if (ti->ti_maxsynch.period != 0 && csp->cs_period == 0)
{
ti->ti_maxsynch.period = 0;
ti->ti_maxsynch.offset = 0;
cti->cti_syncreg = 0;
return EINVAL;
}
cti->cti_syncreg = ((offset & 0x0f) | csp->cs_syncr);
if (ct->ct_synch_setup != 0)
(*ct->ct_synch_setup) (ct, li);
return 0;
}
/*************************************************
* <DATA PHASE>
*************************************************/
static int
ct_xfer(ct, data, len, direction)
struct ct_softc *ct;
u_int8_t *data;
int len, direction;
{
bus_space_tag_t bst = ct->sc_iot;
bus_space_handle_t bsh = ct->sc_ioh;
int wc;
register u_int8_t aux;
if (len == 1)
{
ct_cr_write_1(bst, bsh, wd3s_cmd, WD3S_SBT | WD3S_TFR_INFO);
}
else
{
cthw_set_count(bst, bsh, len);
ct_cr_write_1(bst, bsh, wd3s_cmd, WD3S_TFR_INFO);
}
aux = ct_stat_read_1(bst, bsh);
if ((aux & STR_LCI) != 0)
{
cthw_set_count(bst, bsh, 0);
return len;
}
for (wc = ct->sc_wc ; wc > 0; wc --)
{
/* check data ready */
if ((aux & (STR_BSY | STR_DBR)) == (STR_BSY | STR_DBR))
{
if (direction == SCSI_LOW_READ)
*data = ct_cr_read_1(bst, bsh, wd3s_data);
else
ct_cr_write_1(bst, bsh, wd3s_data, *data);
len --;
if (len <= 0)
break;
data ++;
}
/* check phase miss */
aux = ct_stat_read_1(bst, bsh);
if ((aux & STR_INT) != 0)
break;
}
return len;
}
static void
ct_io_xfer(ct)
struct ct_softc *ct;
{
struct scsi_low_softc *slp = &ct->sc_sclow;
bus_space_tag_t bst = ct->sc_iot;
bus_space_handle_t bsh = ct->sc_ioh;
struct sc_p *sp = &slp->sl_scp;
u_int dummy;
int len;
/* io polling mode */
ct_cr_write_1(bst, bsh, wd3s_ctrl, ct->sc_creg);
if (sp->scp_datalen <= 0)
{
slp->sl_error |= PDMAERR;
dummy = 0;
len = ct_xfer(ct, (u_int8_t *) &dummy, 1, sp->scp_direction);
}
else
len = ct_xfer(ct, sp->scp_data, sp->scp_datalen,
sp->scp_direction);
sp->scp_data += (sp->scp_datalen - len);
sp->scp_datalen = len;
}
/**************************************************
* <PHASE ERROR>
**************************************************/
struct ct_err {
u_char *pe_msg;
u_int pe_err;
u_int pe_errmsg;
int pe_done;
};
struct ct_err ct_cmderr[] = {
/*0*/ { "illegal cmd", FATALIO, SCSI_LOW_MSG_ABORT, 1},
/*1*/ { "unexpected bus free", FATALIO, 0, 1},
/*2*/ { NULL, SELTIMEOUTIO, 0, 1},
/*3*/ { "scsi bus parity error", PARITYERR, SCSI_LOW_MSG_ERROR, 0},
/*4*/ { "scsi bus parity error", PARITYERR, SCSI_LOW_MSG_ERROR, 0},
/*5*/ { "unknown" , FATALIO, SCSI_LOW_MSG_ABORT, 1},
/*6*/ { "miss reselection (target mode)", FATALIO, SCSI_LOW_MSG_ABORT, 0},
/*7*/ { "wrong status byte", PARITYERR, SCSI_LOW_MSG_ERROR, 0},
};
static void
ct_phase_error(ct, scsi_status)
struct ct_softc *ct;
u_int8_t scsi_status;
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct targ_info *ti = slp->sl_nexus;
struct ct_err *pep;
u_int msg = 0;
if ((scsi_status & BSR_CM) == BSR_CMDERR &&
(scsi_status & BSR_PHVALID) == 0)
{
pep = &ct_cmderr[scsi_status & BSR_PM];
slp->sl_error |= pep->pe_err;
if ((pep->pe_err & PARITYERR) != 0)
{
if (ti->ti_phase == PH_MSGIN)
msg = SCSI_LOW_MSG_PARITY;
else
msg = SCSI_LOW_MSG_ERROR;
}
else
msg = pep->pe_errmsg;
if (msg != 0)
scsi_low_assert_msg(slp, slp->sl_nexus, msg, 1);
if (pep->pe_msg != NULL)
{
printf("%s: phase error: %s",
slp->sl_xname, pep->pe_msg);
scsi_low_print(slp, slp->sl_nexus);
}
if (pep->pe_done != 0)
scsi_low_disconnected(slp, ti);
}
else
{
slp->sl_error |= FATALIO;
scsi_low_restart(slp, SCSI_LOW_RESTART_HARD, "phase error");
}
}
/**************************************************
* ### SCSI PHASE SEQUENCER ###
**************************************************/
static __inline int
ct_reselected(ct)
struct ct_softc *ct;
{
struct scsi_low_softc *slp = &ct->sc_sclow;
bus_space_tag_t bst = ct->sc_iot;
bus_space_handle_t bsh = ct->sc_ioh;
struct targ_info *ti;
u_int sid;
ct->sc_atten = 0;
sid = (ct_cr_read_1(bst, bsh, wd3s_sid) & SIDR_IDM);
if ((ti = scsi_low_reselected(slp, sid)) == NULL)
return EJUSTRETURN;
ct_cr_write_1(bst, bsh, wd3s_did, sid);
ct_cr_write_1(bst, bsh, wd3s_lun, 0); /* temp */
ct_cr_write_1(bst, bsh, wd3s_ctrl, ct->sc_creg | CR_DMA);
cthw_set_count(bst, bsh, 0);
return EJUSTRETURN;
}
static int
ct_nexus(ct, ti)
struct ct_softc *ct;
struct targ_info *ti;
{
bus_space_tag_t bst = ct->sc_iot;
bus_space_handle_t bsh = ct->sc_ioh;
struct lun_info *li = ti->ti_li;
struct ct_targ_info *cti = (void *) ti;
if ((li->li_flags & SCSI_LOW_NOPARITY) != 0)
ct->sc_creg = CR_DEFAULT;
else
ct->sc_creg = CR_DEFAULT_HP;
ct_cr_write_1(bst, bsh, wd3s_did, ti->ti_id);
ct_cr_write_1(bst, bsh, wd3s_lun, li->li_lun);
ct_cr_write_1(bst, bsh, wd3s_ctrl, ct->sc_creg | CR_DMA);
ct_cr_write_1(bst, bsh, wd3s_cph, 0);
ct_cr_write_1(bst, bsh, wd3s_synch, cti->cti_syncreg);
cthw_set_count(bst, bsh, 0);
ct_cr_write_1(bst, bsh, wd3s_lun, li->li_lun); /* XXX */
return 0;
}
int
ctintr(arg)
void *arg;
{
struct ct_softc *ct = arg;
struct scsi_low_softc *slp = &ct->sc_sclow;
bus_space_tag_t bst = ct->sc_iot;
bus_space_handle_t bsh = ct->sc_ioh;
struct targ_info *ti;
struct physio_proc *pp;
struct buf *bp;
int len, satgo;
u_int8_t scsi_status, regv;
if (slp->sl_flags & HW_INACTIVE)
return 0;
/**************************************************
* Get status & bus phase
**************************************************/
if ((ct_stat_read_1(bst, bsh) & STR_INT) == 0)
return 0;
scsi_status = ct_cr_read_1(bst, bsh, wd3s_stat);
if (scsi_status == ((u_int8_t) -1))
return 1;
/**************************************************
* Check reselection, or nexus
**************************************************/
if (scsi_status == BSR_RESEL)
{
if (ct_reselected(ct) == EJUSTRETURN)
return 1;
}
if ((ti = slp->sl_nexus) == NULL)
return 1;
/**************************************************
* Debug section
**************************************************/
#ifdef CT_DEBUG
if (ct_debug > 0)
{
scsi_low_print(slp, NULL);
printf("%s: scsi_status 0x%x\n\n", slp->sl_xname,
(u_int) scsi_status);
if (ct_debug > 1)
Debugger();
}
#endif /* CT_DEBUG */
/**************************************************
* Internal scsi phase
**************************************************/
satgo = ct->sc_satgo;
ct->sc_satgo = 0;
switch (ti->ti_phase)
{
case PH_SELSTART:
if ((satgo & CT_SAT_GOING) == 0)
{
if (scsi_status != BSR_SELECTED)
{
ct_phase_error(ct, scsi_status);
return 1;
}
scsi_low_arbit_win(slp, ti);
SCSI_LOW_SETUP_PHASE(ti, PH_SELECTED);
scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_IDENTIFY, 0);
return 1;
}
else
{
scsi_low_arbit_win(slp, ti);
SCSI_LOW_SETUP_PHASE(ti, PH_SELECTED);
}
break;
case PH_RESEL:
if ((scsi_status & BSR_PHVALID) == 0 ||
(scsi_status & BSR_PM) != BSR_MSGIN)
{
scsi_low_restart(slp, SCSI_LOW_RESTART_HARD,
"phase miss after reselect");
return 1;
}
break;
default:
if (slp->sl_flags & HW_PDMASTART)
{
slp->sl_flags &= ~HW_PDMASTART;
if (ct->sc_dma & CT_DMA_DMASTART)
{
(*ct->ct_dma_xfer_stop) (ct);
ct->sc_dma &= ~CT_DMA_DMASTART;
}
else
{
(*ct->ct_pio_xfer_stop) (ct);
ct->sc_dma &= ~CT_DMA_PIOSTART;
}
}
break;
}
/**************************************************
* parse scsi phase
**************************************************/
if (scsi_status & BSR_PHVALID)
{
/**************************************************
* Normal SCSI phase.
**************************************************/
if ((scsi_status & BSR_CM) == BSR_CMDABT)
{
ct_phase_error(ct, scsi_status);
return 1;
}
switch (scsi_status & BSR_PM)
{
case BSR_DATAOUT:
SCSI_LOW_SETUP_PHASE(ti, PH_DATA);
if (scsi_low_data(slp, ti, &bp, SCSI_LOW_WRITE) != 0)
return 1;
goto common_data_phase;
case BSR_DATAIN:
SCSI_LOW_SETUP_PHASE(ti, PH_DATA);
if (scsi_low_data(slp, ti, &bp, SCSI_LOW_READ) != 0)
return 1;
common_data_phase:
if (slp->sl_scp.scp_datalen <= 0)
{
ct_io_xfer(ct);
return 1;
}
slp->sl_flags |= HW_PDMASTART;
if ((ct->sc_xmode & CT_XMODE_PIO) != 0 &&
(slp->sl_scp.scp_datalen % DEV_BSIZE) == 0)
{
pp = physio_proc_enter(bp);
ct->sc_dma |= CT_DMA_PIOSTART;
(*ct->ct_pio_xfer_start) (ct);
physio_proc_leave(pp);
return 1;
}
else
{
ct->sc_dma |= CT_DMA_DMASTART;
(*ct->ct_dma_xfer_start) (ct);
ct_cr_write_1(bst, bsh, wd3s_cmd, WD3S_TFR_INFO);
}
return 1;
case BSR_CMDOUT:
SCSI_LOW_SETUP_PHASE(ti, PH_CMD);
if (scsi_low_cmd(slp, ti) != 0)
break;
if (ct_xfer(ct,
slp->sl_scp.scp_cmd,
slp->sl_scp.scp_cmdlen,
SCSI_LOW_WRITE) != 0)
{
printf("%s: scsi cmd xfer short\n",
slp->sl_xname);
}
return 1;
case BSR_STATIN:
SCSI_LOW_SETUP_PHASE(ti, PH_STAT);
#ifdef CT_USE_CCSEQ
if (scsi_low_is_msgout_continue(ti) != 0 ||
ct->sc_atten != 0)
{
ct_xfer(ct, &ti->ti_status, 1, SCSI_LOW_READ);
}
else
{
cthw_set_count(bst, bsh, 0);
cthw_phase_bypass(ct, 0x41);
}
#else /* !CT_USE_CCSEQ */
ct_xfer(ct, &ti->ti_status, 1, SCSI_LOW_READ);
#endif /* !CT_USE_CCSEQ */
return 1;
case BSR_UNSPINFO0:
case BSR_UNSPINFO1:
printf("%s: illegal bus phase (0x%x)\n", slp->sl_xname,
(u_int) scsi_status);
scsi_low_print(slp, ti);
return 1;
case BSR_MSGOUT:
SCSI_LOW_SETUP_PHASE(ti, PH_MSGOUT);
len = scsi_low_msgout(slp, ti);
if (ct_xfer(ct, ti->ti_msgoutstr, len, SCSI_LOW_WRITE))
{
printf("%s: scsi msgout xfer short\n",
slp->sl_xname);
scsi_low_assert_msg(slp, ti,
SCSI_LOW_MSG_ABORT, 1);
}
return 1;
case BSR_MSGIN:/* msg in */
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
ct_xfer(ct, &regv, 1, SCSI_LOW_READ);
scsi_low_msgin(slp, ti, regv);
return 1;
}
}
else
{
/**************************************************
* Special SCSI phase
**************************************************/
switch (scsi_status)
{
case BSR_SATSDP: /* SAT with save data pointer */
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
scsi_low_msgin(slp, ti, MSG_SAVESP);
cthw_phase_bypass(ct, 0x41);
return 1;
case BSR_SATFIN: /* SAT COMPLETE */
/*
* emulate statusin => msgin
*/
ti->ti_status = ct_cr_read_1(bst, bsh, wd3s_lun);
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
SCSI_LOW_SETUP_MSGPHASE(slp, MSGPH_CMDC);
scsi_low_disconnected(slp, ti);
return 1;
case BSR_ACKREQ: /* negate ACK */
if (ct->sc_atten != 0)
cthw_attention(ct);
ct_cr_write_1(bst, bsh, wd3s_cmd, WD3S_NEGATE_ACK);
return 1;
case BSR_DISC: /* disconnect */
if (slp->sl_msgphase == MSGPH_NULL &&
(satgo & CT_SAT_GOING) != 0)
{
/*
* emulate disconnect msg
*/
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
SCSI_LOW_SETUP_MSGPHASE(slp, MSGPH_DISC);
}
scsi_low_disconnected(slp, ti);
return 1;
default:
break;
}
}
ct_phase_error(ct, scsi_status);
return 1;
}
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