FreeBSD-5.3/sys/dev/stg/tmc18c30.c
/* $NecBSD: tmc18c30.c,v 1.28.12.3 2001/06/19 04:35:48 honda Exp $ */
/* $NetBSD$ */
#define STG_DEBUG
#define STG_STATICS
#define STG_IO_CONTROL_FLAGS (STG_FIFO_INTERRUPTS | STG_WAIT_FOR_SELECT)
/*
* [NetBSD for NEC PC-98 series]
* Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001
* NetBSD/pc98 porting staff. All rights reserved.
* Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001
* Naofumi HONDA. All rights reserved.
* Copyright (c) 1996, 1997, 1998, 1999
* Kouichi Matsuda. 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/dev/stg/tmc18c30.c,v 1.12 2004/07/10 21:14:20 marcel Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#if defined(__FreeBSD__) && __FreeBSD_version >= 500001
#include <sys/bio.h>
#endif /* __FreeBSD__ */
#include <sys/buf.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#ifdef __NetBSD__
#include <sys/device.h>
#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 <i386/Cbus/dev/tmc18c30reg.h>
#include <i386/Cbus/dev/tmc18c30var.h>
#endif /* __NetBSD__ */
#ifdef __FreeBSD__
#include <machine/clock.h>
#include <machine/cpu.h>
#include <machine/bus_pio.h>
#include <machine/bus.h>
#include <compat/netbsd/dvcfg.h>
#include <compat/netbsd/physio_proc.h>
#include <cam/scsi/scsi_low.h>
#include <dev/stg/tmc18c30reg.h>
#include <dev/stg/tmc18c30var.h>
#endif /* __FreeBSD__ */
/***************************************************
* USER SETTINGS
***************************************************/
/* DEVICE CONFIGURATION FLAGS (MINOR)
*
* 0x01 DISCONECT OFF
* 0x02 PARITY LINE OFF
* 0x04 IDENTIFY MSG OFF ( = single lun)
* 0x08 SYNC TRANSFER OFF
*/
/* #define STG_SYNC_SUPPORT */ /* NOT YET but easy */
/* For the 512 fifo type: change below */
#define TMC18C30_FIFOSZ 0x800
#define TMC18C30_FCBSZ 0x200
#define TMC18C50_FIFOSZ 0x2000
#define TMC18C50_FCBSZ 0x400
#define STG_MAX_DATA_SIZE (64 * 1024)
#define STG_DELAY_MAX (2 * 1000 * 1000)
#define STG_DELAY_INTERVAL (1)
#define STG_DELAY_SELECT_POLLING_MAX (5 * 1000 * 1000)
/***************************************************
* PARAMS
***************************************************/
#define STG_NTARGETS 8
#define STG_NLUNS 8
/***************************************************
* DEBUG
***************************************************/
#ifdef STG_DEBUG
static int stg_debug;
#endif /* STG_DEBUG */
#ifdef STG_STATICS
static struct stg_statics {
int arbit_fail_0;
int arbit_fail_1;
int disconnect;
int reselect;
} stg_statics;
#endif /* STG_STATICS */
/***************************************************
* IO control flags
***************************************************/
#define STG_FIFO_INTERRUPTS 0x0001
#define STG_WAIT_FOR_SELECT 0x0100
int stg_io_control = STG_IO_CONTROL_FLAGS;
/***************************************************
* DEVICE STRUCTURE
***************************************************/
extern struct cfdriver stg_cd;
/**************************************************************
* DECLARE
**************************************************************/
/* static */
static void stg_pio_read(struct stg_softc *, struct targ_info *, u_int);
static void stg_pio_write(struct stg_softc *, struct targ_info *, u_int);
static int stg_xfer(struct stg_softc *, u_int8_t *, int, int, int);
static int stg_msg(struct stg_softc *, struct targ_info *, u_int);
static int stg_reselected(struct stg_softc *);
static int stg_disconnected(struct stg_softc *, struct targ_info *);
static __inline void stg_pdma_end(struct stg_softc *, struct targ_info *);
static int stghw_select_targ_wait(struct stg_softc *, int);
static int stghw_check(struct stg_softc *);
static void stghw_init(struct stg_softc *);
static int stg_negate_signal(struct stg_softc *, u_int8_t, u_char *);
static int stg_expect_signal(struct stg_softc *, u_int8_t, u_int8_t);
static int stg_world_start(struct stg_softc *, int);
static int stghw_start_selection(struct stg_softc *sc, struct slccb *);
static void stghw_bus_reset(struct stg_softc *);
static void stghw_attention(struct stg_softc *);
static int stg_target_nexus_establish(struct stg_softc *);
static int stg_lun_nexus_establish(struct stg_softc *);
static int stg_ccb_nexus_establish(struct stg_softc *);
static int stg_targ_init(struct stg_softc *, struct targ_info *, int);
static __inline void stghw_bcr_write_1(struct stg_softc *, u_int8_t);
static int stg_timeout(struct stg_softc *);
static void stg_selection_done_and_expect_msgout(struct stg_softc *);
struct scsi_low_funcs stgfuncs = {
SC_LOW_INIT_T stg_world_start,
SC_LOW_BUSRST_T stghw_bus_reset,
SC_LOW_TARG_INIT_T stg_targ_init,
SC_LOW_LUN_INIT_T NULL,
SC_LOW_SELECT_T stghw_start_selection,
SC_LOW_NEXUS_T stg_lun_nexus_establish,
SC_LOW_NEXUS_T stg_ccb_nexus_establish,
SC_LOW_ATTEN_T stghw_attention,
SC_LOW_MSG_T stg_msg,
SC_LOW_TIMEOUT_T stg_timeout,
SC_LOW_POLL_T stgintr,
NULL,
};
/****************************************************
* hwfuncs
****************************************************/
static __inline void
stghw_bcr_write_1(sc, bcv)
struct stg_softc *sc;
u_int8_t bcv;
{
bus_space_write_1(sc->sc_iot, sc->sc_ioh, tmc_bctl, bcv);
sc->sc_busimg = bcv;
}
static int
stghw_check(sc)
struct stg_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
u_int fcbsize, fcb;
u_int16_t lsb, msb;
lsb = bus_space_read_1(iot, ioh, tmc_idlsb);
msb = bus_space_read_1(iot, ioh, tmc_idmsb);
switch (msb << 8 | lsb)
{
case 0x6127:
/* TMCCHIP_1800 not supported. (it's my policy) */
sc->sc_chip = TMCCHIP_1800;
return EINVAL;
case 0x60e9:
if (bus_space_read_1(iot, ioh, tmc_cfg2) & 0x02)
{
sc->sc_chip = TMCCHIP_18C30;
sc->sc_fsz = TMC18C30_FIFOSZ;
fcbsize = TMC18C30_FCBSZ;
}
else
{
sc->sc_chip = TMCCHIP_18C50;
sc->sc_fsz = TMC18C50_FIFOSZ;
fcbsize = TMC18C50_FCBSZ;
}
break;
default:
sc->sc_chip = TMCCHIP_UNK;
return ENODEV;
}
sc->sc_fcRinit = FCTL_INTEN;
sc->sc_fcWinit = FCTL_PARENB | FCTL_INTEN;
if (slp->sl_cfgflags & CFG_NOATTEN)
sc->sc_imsg = 0;
else
sc->sc_imsg = BCTL_ATN;
sc->sc_busc = BCTL_BUSEN;
sc->sc_wthold = fcbsize + 256;
sc->sc_rthold = fcbsize - 256;
sc->sc_maxwsize = sc->sc_fsz;
fcb = fcbsize / (sc->sc_fsz / 16);
sc->sc_icinit = ICTL_CD | ICTL_SEL | ICTL_ARBIT | fcb;
return 0;
}
static void
stghw_init(sc)
struct stg_softc *sc;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
bus_space_write_1(iot, ioh, tmc_ictl, 0);
stghw_bcr_write_1(sc, BCTL_BUSFREE);
bus_space_write_1(iot, ioh, tmc_fctl,
sc->sc_fcRinit | FCTL_CLRFIFO | FCTL_CLRINT);
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
bus_space_write_1(iot, ioh, tmc_ictl, sc->sc_icinit);
bus_space_write_1(iot, ioh, tmc_ssctl, 0);
}
static int
stg_targ_init(sc, ti, action)
struct stg_softc *sc;
struct targ_info *ti;
int action;
{
struct stg_targ_info *sti = (void *) ti;
if (action == SCSI_LOW_INFO_ALLOC || action == SCSI_LOW_INFO_REVOKE)
{
ti->ti_width = SCSI_LOW_BUS_WIDTH_8;
ti->ti_maxsynch.period = 0;
ti->ti_maxsynch.offset = 0;
sti->sti_reg_synch = 0;
}
return 0;
}
/****************************************************
* scsi low interface
****************************************************/
static void
stghw_attention(sc)
struct stg_softc *sc;
{
sc->sc_busc |= BCTL_ATN;
sc->sc_busimg |= BCTL_ATN;
bus_space_write_1(sc->sc_iot, sc->sc_ioh, tmc_bctl, sc->sc_busimg);
SCSI_LOW_DELAY(10);
}
static void
stghw_bus_reset(sc)
struct stg_softc *sc;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
bus_space_write_1(iot, ioh, tmc_ictl, 0);
bus_space_write_1(iot, ioh, tmc_fctl, 0);
stghw_bcr_write_1(sc, BCTL_RST);
SCSI_LOW_DELAY(100000);
stghw_bcr_write_1(sc, BCTL_BUSFREE);
}
static int
stghw_start_selection(sc, cb)
struct stg_softc *sc;
struct slccb *cb;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct targ_info *ti = cb->ti;
register u_int8_t stat;
int s;
sc->sc_tmaxcnt = cb->ccb_tcmax * 1000 * 1000;
sc->sc_dataout_timeout = 0;
sc->sc_ubf_timeout = 0;
stghw_bcr_write_1(sc, BCTL_BUSFREE);
bus_space_write_1(iot, ioh, tmc_ictl, sc->sc_icinit);
s = splhigh();
stat = bus_space_read_1(iot, ioh, tmc_astat);
if ((stat & ASTAT_INT) != 0)
{
splx(s);
return SCSI_LOW_START_FAIL;
}
bus_space_write_1(iot, ioh, tmc_scsiid, sc->sc_idbit);
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit | FCTL_ARBIT);
splx(s);
SCSI_LOW_SETUP_PHASE(ti, PH_ARBSTART);
return SCSI_LOW_START_OK;
}
static int
stg_world_start(sc, fdone)
struct stg_softc *sc;
int fdone;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
int error;
if ((slp->sl_cfgflags & CFG_NOPARITY) == 0)
sc->sc_fcRinit |= FCTL_PARENB;
else
sc->sc_fcRinit &= ~FCTL_PARENB;
if ((error = stghw_check(sc)) != 0)
return error;
stghw_init(sc);
scsi_low_bus_reset(slp);
stghw_init(sc);
SOFT_INTR_REQUIRED(slp);
return 0;
}
static int
stg_msg(sc, ti, msg)
struct stg_softc *sc;
struct targ_info *ti;
u_int msg;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct stg_targ_info *sti = (void *) ti;
u_int period, offset;
if ((msg & SCSI_LOW_MSG_WIDE) != 0)
{
if (ti->ti_width != SCSI_LOW_BUS_WIDTH_8)
{
ti->ti_width = SCSI_LOW_BUS_WIDTH_8;
return EINVAL;
}
return 0;
}
if ((msg & SCSI_LOW_MSG_SYNCH) == 0)
return 0;
period = ti->ti_maxsynch.period;
offset = ti->ti_maxsynch.offset;
period = period << 2;
if (period >= 200)
{
sti->sti_reg_synch = (period - 200) / 50;
if (period % 50)
sti->sti_reg_synch ++;
sti->sti_reg_synch |= SSCTL_SYNCHEN;
}
else if (period >= 100)
{
sti->sti_reg_synch = (period - 100) / 50;
if (period % 50)
sti->sti_reg_synch ++;
sti->sti_reg_synch |= SSCTL_SYNCHEN | SSCTL_FSYNCHEN;
}
bus_space_write_1(iot, ioh, tmc_ssctl, sti->sti_reg_synch);
return 0;
}
/**************************************************************
* General probe attach
**************************************************************/
int
stgprobesubr(iot, ioh, dvcfg)
bus_space_tag_t iot;
bus_space_handle_t ioh;
u_int dvcfg;
{
u_int16_t lsb, msb;
lsb = bus_space_read_1(iot, ioh, tmc_idlsb);
msb = bus_space_read_1(iot, ioh, tmc_idmsb);
switch (msb << 8 | lsb)
{
default:
return 0;
case 0x6127:
/* not support! */
return 0;
case 0x60e9:
return 1;
}
return 0;
}
int
stgprint(aux, name)
void *aux;
const char *name;
{
if (name != NULL)
printf("%s: scsibus ", name);
return UNCONF;
}
void
stgattachsubr(sc)
struct stg_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
printf("\n");
sc->sc_idbit = (1 << slp->sl_hostid);
slp->sl_funcs = &stgfuncs;
sc->sc_tmaxcnt = SCSI_LOW_MIN_TOUT * 1000 * 1000; /* default */
slp->sl_flags |= HW_READ_PADDING;
slp->sl_cfgflags |= CFG_ASYNC; /* XXX */
(void) scsi_low_attach(slp, 0, STG_NTARGETS, STG_NLUNS,
sizeof(struct stg_targ_info), 0);
}
/**************************************************************
* PDMA functions
**************************************************************/
static __inline void
stg_pdma_end(sc, ti)
struct stg_softc *sc;
struct targ_info *ti;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct slccb *cb = slp->sl_Qnexus;
u_int len, tres;
slp->sl_flags &= ~HW_PDMASTART;
sc->sc_icinit &= ~ICTL_FIFO;
sc->sc_dataout_timeout = 0;
if (cb == NULL)
{
slp->sl_error |= PDMAERR;
goto out;
}
if (ti->ti_phase == PH_DATA)
{
len = bus_space_read_2(iot, ioh, tmc_fdcnt);
if (slp->sl_scp.scp_direction == SCSI_LOW_WRITE)
{
if (len != 0)
{
tres = len + slp->sl_scp.scp_datalen;
if (tres <= (u_int) cb->ccb_scp.scp_datalen)
{
slp->sl_scp.scp_data -= len;
slp->sl_scp.scp_datalen = tres;
}
else
{
slp->sl_error |= PDMAERR;
printf("%s len %x >= datalen %x\n",
slp->sl_xname,
len, slp->sl_scp.scp_datalen);
}
}
}
else if (slp->sl_scp.scp_direction == SCSI_LOW_READ)
{
if (len != 0)
{
slp->sl_error |= PDMAERR;
printf("%s: len %x left in fifo\n",
slp->sl_xname, len);
}
}
scsi_low_data_finish(slp);
}
else
{
printf("%s data phase miss\n", slp->sl_xname);
slp->sl_error |= PDMAERR;
}
out:
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
}
static void
stg_pio_read(sc, ti, thold)
struct stg_softc *sc;
struct targ_info *ti;
u_int thold;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct sc_p *sp = &slp->sl_scp;
int s, tout;
u_int res;
u_int8_t stat;
if ((slp->sl_flags & HW_PDMASTART) == 0)
{
bus_space_write_1(iot, ioh, tmc_fctl,
sc->sc_fcRinit | FCTL_FIFOEN);
slp->sl_flags |= HW_PDMASTART;
}
tout = sc->sc_tmaxcnt;
while (tout -- > 0)
{
if (thold > 0)
{
s = splhigh();
res = bus_space_read_2(iot, ioh, tmc_fdcnt);
if (res < thold)
{
bus_space_write_1(iot, ioh, tmc_ictl,
sc->sc_icinit);
splx(s);
break;
}
splx(s);
}
else
{
stat = bus_space_read_1(iot, ioh, tmc_bstat);
res = bus_space_read_2(iot, ioh, tmc_fdcnt);
if (res == 0)
{
if ((stat & PHASE_MASK) != DATA_IN_PHASE)
break;
if (sp->scp_datalen <= 0)
break;
SCSI_LOW_DELAY(1);
continue;
}
}
/* The assumtion res != 0 is valid here */
if (res > sp->scp_datalen)
{
if (res == (u_int) -1)
break;
slp->sl_error |= PDMAERR;
if ((slp->sl_flags & HW_READ_PADDING) == 0)
{
printf("%s: read padding required\n",
slp->sl_xname);
break;
}
sp->scp_datalen = 0;
if (res > STG_MAX_DATA_SIZE)
res = STG_MAX_DATA_SIZE;
while (res -- > 0)
{
(void) bus_space_read_1(iot, ioh, tmc_rfifo);
}
continue;
}
sp->scp_datalen -= res;
if (res & 1)
{
*sp->scp_data = bus_space_read_1(iot, ioh, tmc_rfifo);
sp->scp_data ++;
res --;
}
bus_space_read_multi_2(iot, ioh, tmc_rfifo,
(u_int16_t *) sp->scp_data, res >> 1);
sp->scp_data += res;
}
if (tout <= 0)
printf("%s: pio read timeout\n", slp->sl_xname);
}
static void
stg_pio_write(sc, ti, thold)
struct stg_softc *sc;
struct targ_info *ti;
u_int thold;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct sc_p *sp = &slp->sl_scp;
u_int res;
int s, tout;
register u_int8_t stat;
if ((slp->sl_flags & HW_PDMASTART) == 0)
{
stat = sc->sc_fcWinit | FCTL_FIFOEN | FCTL_FIFOW;
bus_space_write_1(iot, ioh, tmc_fctl, stat | FCTL_CLRFIFO);
bus_space_write_1(iot, ioh, tmc_fctl, stat);
slp->sl_flags |= HW_PDMASTART;
}
tout = sc->sc_tmaxcnt;
while (tout -- > 0)
{
stat = bus_space_read_1(iot, ioh, tmc_bstat);
if ((stat & PHASE_MASK) != DATA_OUT_PHASE)
break;
if (sp->scp_datalen <= 0)
{
if (sc->sc_dataout_timeout == 0)
sc->sc_dataout_timeout = SCSI_LOW_TIMEOUT_HZ;
break;
}
if (thold > 0)
{
s = splhigh();
res = bus_space_read_2(iot, ioh, tmc_fdcnt);
if (res > thold)
{
bus_space_write_1(iot, ioh, tmc_ictl,
sc->sc_icinit);
splx(s);
break;
}
splx(s);
}
else
{
res = bus_space_read_2(iot, ioh, tmc_fdcnt);
if (res > sc->sc_maxwsize / 2)
{
SCSI_LOW_DELAY(1);
continue;
}
}
if (res == (u_int) -1)
break;
res = sc->sc_maxwsize - res;
if (res > sp->scp_datalen)
res = sp->scp_datalen;
sp->scp_datalen -= res;
if ((res & 0x1) != 0)
{
bus_space_write_1(iot, ioh, tmc_wfifo, *sp->scp_data);
sp->scp_data ++;
res --;
}
bus_space_write_multi_2(iot, ioh, tmc_wfifo,
(u_int16_t *) sp->scp_data, res >> 1);
sp->scp_data += res;
}
if (tout <= 0)
printf("%s: pio write timeout\n", slp->sl_xname);
}
static int
stg_negate_signal(sc, mask, s)
struct stg_softc *sc;
u_int8_t mask;
u_char *s;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
int wc;
u_int8_t regv;
for (wc = 0; wc < STG_DELAY_MAX / STG_DELAY_INTERVAL; wc ++)
{
regv = bus_space_read_1(bst, bsh, tmc_bstat);
if (regv == (u_int8_t) -1)
return -1;
if ((regv & mask) == 0)
return 1;
SCSI_LOW_DELAY(STG_DELAY_INTERVAL);
}
printf("%s: %s stg_negate_signal timeout\n", slp->sl_xname, s);
return -1;
}
static int
stg_expect_signal(sc, phase, mask)
struct stg_softc *sc;
u_int8_t phase, mask;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
int wc;
u_int8_t ph;
phase &= PHASE_MASK;
for (wc = 0; wc < STG_DELAY_MAX / STG_DELAY_INTERVAL; wc ++)
{
ph = bus_space_read_1(bst, bsh, tmc_bstat);
if (ph == (u_int8_t) -1)
return -1;
if ((ph & PHASE_MASK) != phase)
return 0;
if ((ph & mask) != 0)
return 1;
SCSI_LOW_DELAY(STG_DELAY_INTERVAL);
}
printf("%s: stg_expect_signal timeout\n", slp->sl_xname);
return -1;
}
static int
stg_xfer(sc, buf, len, phase, clear_atn)
struct stg_softc *sc;
u_int8_t *buf;
int len;
int phase;
int clear_atn;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int rv, ptr;
if (phase & BSTAT_IO)
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
else
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcWinit);
for (ptr = 0; len > 0; len --)
{
rv = stg_expect_signal(sc, phase, BSTAT_REQ);
if (rv <= 0)
goto bad;
if (len == 1 && clear_atn != 0)
{
sc->sc_busc &= ~BCTL_ATN;
stghw_bcr_write_1(sc, sc->sc_busc);
SCSI_LOW_DEASSERT_ATN(&sc->sc_sclow);
}
if (phase & BSTAT_IO)
{
buf[ptr ++] = bus_space_read_1(iot, ioh, tmc_rdata);
}
else
{
bus_space_write_1(iot, ioh, tmc_wdata, buf[ptr ++]);
}
stg_negate_signal(sc, BSTAT_ACK, "xfer<ACK>");
}
bad:
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
return len;
}
/**************************************************************
* disconnect & reselect (HW low)
**************************************************************/
static int
stg_reselected(sc)
struct stg_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int tout;
u_int sid;
u_int8_t regv;
if (slp->sl_selid != NULL)
{
/* XXX:
* Selection vs Reselection conflicts.
*/
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
stghw_bcr_write_1(sc, BCTL_BUSFREE);
}
else if (slp->sl_Tnexus != NULL)
{
printf("%s: unexpected termination\n", slp->sl_xname);
stg_disconnected(sc, slp->sl_Tnexus);
}
/* XXX:
* We should ack the reselection as soon as possible,
* because the target would abort the current reselection seq
* due to reselection timeout.
*/
tout = STG_DELAY_SELECT_POLLING_MAX;
while (tout -- > 0)
{
regv = bus_space_read_1(iot, ioh, tmc_bstat);
if ((regv & (BSTAT_IO | BSTAT_SEL | BSTAT_BSY)) ==
(BSTAT_IO | BSTAT_SEL))
{
SCSI_LOW_DELAY(1);
regv = bus_space_read_1(iot, ioh, tmc_bstat);
if ((regv & (BSTAT_IO | BSTAT_SEL | BSTAT_BSY)) ==
(BSTAT_IO | BSTAT_SEL))
goto reselect_start;
}
SCSI_LOW_DELAY(1);
}
printf("%s: reselction timeout I\n", slp->sl_xname);
return EJUSTRETURN;
reselect_start:
sid = (u_int) bus_space_read_1(iot, ioh, tmc_scsiid);
if ((sid & sc->sc_idbit) == 0)
{
/* not us */
return EJUSTRETURN;
}
bus_space_write_1(iot, ioh, tmc_fctl,
sc->sc_fcRinit | FCTL_CLRFIFO | FCTL_CLRINT);
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
stghw_bcr_write_1(sc, sc->sc_busc | BCTL_BSY);
while (tout -- > 0)
{
regv = bus_space_read_1(iot, ioh, tmc_bstat);
if ((regv & (BSTAT_SEL | BSTAT_BSY)) == BSTAT_BSY)
goto reselected;
SCSI_LOW_DELAY(1);
}
printf("%s: reselction timeout II\n", slp->sl_xname);
return EJUSTRETURN;
reselected:
sid &= ~sc->sc_idbit;
sid = ffs(sid) - 1;
if (scsi_low_reselected(slp, sid) == NULL)
return EJUSTRETURN;
#ifdef STG_STATICS
stg_statics.reselect ++;
#endif /* STG_STATICS */
return EJUSTRETURN;
}
static int
stg_disconnected(sc, ti)
struct stg_softc *sc;
struct targ_info *ti;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
/* clear bus status & fifo */
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit | FCTL_CLRFIFO);
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
stghw_bcr_write_1(sc, BCTL_BUSFREE);
sc->sc_icinit &= ~ICTL_FIFO;
sc->sc_busc &= ~BCTL_ATN;
sc->sc_dataout_timeout = 0;
sc->sc_ubf_timeout = 0;
#ifdef STG_STATICS
stg_statics.disconnect ++;
#endif /* STG_STATICS */
scsi_low_disconnected(slp, ti);
return 1;
}
/**************************************************************
* SEQUENCER
**************************************************************/
static int
stg_target_nexus_establish(sc)
struct stg_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct targ_info *ti = slp->sl_Tnexus;
struct stg_targ_info *sti = (void *) ti;
bus_space_write_1(iot, ioh, tmc_ssctl, sti->sti_reg_synch);
if ((stg_io_control & STG_FIFO_INTERRUPTS) != 0)
{
sc->sc_icinit |= ICTL_FIFO;
}
return 0;
}
static int
stg_lun_nexus_establish(sc)
struct stg_softc *sc;
{
return 0;
}
static int
stg_ccb_nexus_establish(sc)
struct stg_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
struct slccb *cb = slp->sl_Qnexus;
sc->sc_tmaxcnt = cb->ccb_tcmax * 1000 * 1000;
return 0;
}
#define STGHW_SELECT_INTERVAL 10
static int
stghw_select_targ_wait(sc, mu)
struct stg_softc *sc;
int mu;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
mu = mu / STGHW_SELECT_INTERVAL;
while (mu -- > 0)
{
if ((bus_space_read_1(iot, ioh, tmc_bstat) & BSTAT_BSY) == 0)
{
SCSI_LOW_DELAY(STGHW_SELECT_INTERVAL);
continue;
}
SCSI_LOW_DELAY(1);
if ((bus_space_read_1(iot, ioh, tmc_bstat) & BSTAT_BSY) != 0)
{
return 0;
}
}
return ENXIO;
}
static void
stg_selection_done_and_expect_msgout(sc)
struct stg_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit | FCTL_CLRFIFO);
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
stghw_bcr_write_1(sc, sc->sc_imsg | sc->sc_busc);
SCSI_LOW_ASSERT_ATN(slp);
}
int
stgintr(arg)
void *arg;
{
struct stg_softc *sc = arg;
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct targ_info *ti;
struct physio_proc *pp;
struct buf *bp;
u_int derror, flags;
int len, s;
u_int8_t status, astatus, regv;
/*******************************************
* interrupt check
*******************************************/
if (slp->sl_flags & HW_INACTIVE)
return 0;
astatus = bus_space_read_1(iot, ioh, tmc_astat);
status = bus_space_read_1(iot, ioh, tmc_bstat);
if ((astatus & ASTAT_STATMASK) == 0 || astatus == (u_int8_t) -1)
return 0;
bus_space_write_1(iot, ioh, tmc_ictl, 0);
if (astatus & ASTAT_SCSIRST)
{
bus_space_write_1(iot, ioh, tmc_fctl,
sc->sc_fcRinit | FCTL_CLRFIFO);
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
bus_space_write_1(iot, ioh, tmc_ictl, 0);
scsi_low_restart(slp, SCSI_LOW_RESTART_SOFT,
"bus reset (power off?)");
return 1;
}
/*******************************************
* debug section
*******************************************/
#ifdef STG_DEBUG
if (stg_debug)
{
scsi_low_print(slp, NULL);
printf("%s: st %x ist %x\n\n", slp->sl_xname,
status, astatus);
#ifdef KDB
if (stg_debug > 1)
SCSI_LOW_DEBUGGER("stg");
#endif /* KDB */
}
#endif /* STG_DEBUG */
/*******************************************
* reselection & nexus
*******************************************/
if ((status & RESEL_PHASE_MASK)== PHASE_RESELECTED)
{
if (stg_reselected(sc) == EJUSTRETURN)
goto out;
}
if ((ti = slp->sl_Tnexus) == NULL)
return 0;
derror = 0;
if ((astatus & ASTAT_PARERR) != 0 && ti->ti_phase != PH_ARBSTART &&
(sc->sc_fcRinit & FCTL_PARENB) != 0)
{
slp->sl_error |= PARITYERR;
derror = SCSI_LOW_DATA_PE;
if ((status & PHASE_MASK) == MESSAGE_IN_PHASE)
scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_PARITY, 0);
else
scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_ERROR, 1);
}
/*******************************************
* aribitration & selection
*******************************************/
switch (ti->ti_phase)
{
case PH_ARBSTART:
if ((astatus & ASTAT_ARBIT) == 0)
{
#ifdef STG_STATICS
stg_statics.arbit_fail_0 ++;
#endif /* STG_STATICS */
goto arb_fail;
}
status = bus_space_read_1(iot, ioh, tmc_bstat);
if ((status & BSTAT_IO) != 0)
{
/* XXX:
* Selection vs Reselection conflicts.
*/
#ifdef STG_STATICS
stg_statics.arbit_fail_1 ++;
#endif /* STG_STATICS */
arb_fail:
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
stghw_bcr_write_1(sc, BCTL_BUSFREE);
scsi_low_arbit_fail(slp, slp->sl_Qnexus);
goto out;
}
/*
* selection assert start.
*/
SCSI_LOW_SETUP_PHASE(ti, PH_SELSTART);
scsi_low_arbit_win(slp);
s = splhigh();
bus_space_write_1(iot, ioh, tmc_scsiid,
sc->sc_idbit | (1 << ti->ti_id));
stghw_bcr_write_1(sc, sc->sc_imsg | sc->sc_busc | BCTL_SEL);
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcWinit);
if ((stg_io_control & STG_WAIT_FOR_SELECT) != 0)
{
/* selection abort delay 200 + 100 micro sec */
if (stghw_select_targ_wait(sc, 300) == 0)
{
SCSI_LOW_SETUP_PHASE(ti, PH_SELECTED);
stg_selection_done_and_expect_msgout(sc);
}
}
splx(s);
goto out;
case PH_SELSTART:
if ((status & BSTAT_BSY) == 0)
{
/* selection timeout delay 250 ms */
if (stghw_select_targ_wait(sc, 250 * 1000) != 0)
{
stg_disconnected(sc, ti);
goto out;
}
}
SCSI_LOW_SETUP_PHASE(ti, PH_SELECTED);
stg_selection_done_and_expect_msgout(sc);
goto out;
case PH_SELECTED:
if ((status & BSTAT_REQ) == 0)
goto out;
stg_target_nexus_establish(sc);
break;
case PH_RESEL:
if ((status & BSTAT_REQ) == 0)
goto out;
/* clear a busy line */
bus_space_write_1(iot, ioh, tmc_fctl, sc->sc_fcRinit);
stghw_bcr_write_1(sc, sc->sc_busc);
stg_target_nexus_establish(sc);
if ((status & PHASE_MASK) != MESSAGE_IN_PHASE)
{
printf("%s: unexpected phase after reselect\n",
slp->sl_xname);
slp->sl_error |= FATALIO;
scsi_low_assert_msg(slp, ti, SCSI_LOW_MSG_ABORT, 1);
goto out;
}
break;
}
/*******************************************
* data phase
*******************************************/
if ((slp->sl_flags & HW_PDMASTART) && STG_IS_PHASE_DATA(status) == 0)
{
if (slp->sl_scp.scp_direction == SCSI_LOW_READ)
stg_pio_read(sc, ti, 0);
stg_pdma_end(sc, ti);
}
/*******************************************
* scsi seq
*******************************************/
switch (status & PHASE_MASK)
{
case COMMAND_PHASE:
if (stg_expect_signal(sc, COMMAND_PHASE, BSTAT_REQ) <= 0)
break;
SCSI_LOW_SETUP_PHASE(ti, PH_CMD);
if (scsi_low_cmd(slp, ti) != 0)
{
scsi_low_attention(slp);
}
if (stg_xfer(sc, slp->sl_scp.scp_cmd, slp->sl_scp.scp_cmdlen,
COMMAND_PHASE, 0) != 0)
{
printf("%s: CMDOUT short\n", slp->sl_xname);
}
break;
case DATA_OUT_PHASE:
SCSI_LOW_SETUP_PHASE(ti, PH_DATA);
if (scsi_low_data(slp, ti, &bp, SCSI_LOW_WRITE) != 0)
{
scsi_low_attention(slp);
}
pp = physio_proc_enter(bp);
if ((sc->sc_icinit & ICTL_FIFO) != 0)
stg_pio_write(sc, ti, sc->sc_wthold);
else
stg_pio_write(sc, ti, 0);
physio_proc_leave(pp);
break;
case DATA_IN_PHASE:
SCSI_LOW_SETUP_PHASE(ti, PH_DATA);
if (scsi_low_data(slp, ti, &bp, SCSI_LOW_READ) != 0)
{
scsi_low_attention(slp);
}
pp = physio_proc_enter(bp);
if ((sc->sc_icinit & ICTL_FIFO) != 0)
stg_pio_read(sc, ti, sc->sc_rthold);
else
stg_pio_read(sc, ti, 0);
physio_proc_leave(pp);
break;
case STATUS_PHASE:
regv = stg_expect_signal(sc, STATUS_PHASE, BSTAT_REQ);
if (regv <= 0)
break;
SCSI_LOW_SETUP_PHASE(ti, PH_STAT);
regv = bus_space_read_1(iot, ioh, tmc_sdna);
if (scsi_low_statusin(slp, ti, regv | derror) != 0)
{
scsi_low_attention(slp);
}
if (regv != bus_space_read_1(iot, ioh, tmc_rdata))
{
printf("%s: STATIN: data mismatch\n", slp->sl_xname);
}
stg_negate_signal(sc, BSTAT_ACK, "statin<ACK>");
break;
case MESSAGE_OUT_PHASE:
if (stg_expect_signal(sc, MESSAGE_OUT_PHASE, BSTAT_REQ) <= 0)
break;
SCSI_LOW_SETUP_PHASE(ti, PH_MSGOUT);
flags = (ti->ti_ophase != ti->ti_phase) ?
SCSI_LOW_MSGOUT_INIT : 0;
len = scsi_low_msgout(slp, ti, flags);
if (len > 1 && slp->sl_atten == 0)
{
scsi_low_attention(slp);
}
if (stg_xfer(sc, ti->ti_msgoutstr, len, MESSAGE_OUT_PHASE,
slp->sl_clear_atten) != 0)
{
printf("%s: MSGOUT short\n", slp->sl_xname);
}
else
{
if (slp->sl_msgphase >= MSGPH_ABORT)
{
stg_disconnected(sc, ti);
}
}
break;
case MESSAGE_IN_PHASE:
/* confirm phase and req signal */
if (stg_expect_signal(sc, MESSAGE_IN_PHASE, BSTAT_REQ) <= 0)
break;
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
/* read data with NOACK */
regv = bus_space_read_1(iot, ioh, tmc_sdna);
if (scsi_low_msgin(slp, ti, derror | regv) == 0)
{
if (scsi_low_is_msgout_continue(ti, 0) != 0)
{
scsi_low_attention(slp);
}
}
/* read data with ACK */
if (regv != bus_space_read_1(iot, ioh, tmc_rdata))
{
printf("%s: MSGIN: data mismatch\n", slp->sl_xname);
}
/* wait for the ack negated */
stg_negate_signal(sc, BSTAT_ACK, "msgin<ACK>");
if (slp->sl_msgphase != 0 && slp->sl_msgphase < MSGPH_ABORT)
{
stg_disconnected(sc, ti);
}
break;
case BUSFREE_PHASE:
printf("%s: unexpected disconnect\n", slp->sl_xname);
stg_disconnected(sc, ti);
break;
default:
slp->sl_error |= FATALIO;
printf("%s: unknown phase bus %x intr %x\n",
slp->sl_xname, status, astatus);
break;
}
out:
bus_space_write_1(iot, ioh, tmc_ictl, sc->sc_icinit);
return 1;
}
static int
stg_timeout(sc)
struct stg_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int tout, count;
u_int8_t status;
if (slp->sl_Tnexus == NULL)
return 0;
status = bus_space_read_1(iot, ioh, tmc_bstat);
if ((status & PHASE_MASK) == 0)
{
if (sc->sc_ubf_timeout ++ == 0)
return 0;
printf("%s: unexpected bus free detected\n", slp->sl_xname);
slp->sl_error |= FATALIO;
scsi_low_print(slp, slp->sl_Tnexus);
stg_disconnected(sc, slp->sl_Tnexus);
return 0;
}
switch (status & PHASE_MASK)
{
case DATA_OUT_PHASE:
if (sc->sc_dataout_timeout == 0)
break;
if ((status & BSTAT_REQ) == 0)
break;
if (bus_space_read_2(iot, ioh, tmc_fdcnt) != 0)
break;
if ((-- sc->sc_dataout_timeout) > 0)
break;
slp->sl_error |= PDMAERR;
if ((slp->sl_flags & HW_WRITE_PADDING) == 0)
{
printf("%s: write padding required\n",
slp->sl_xname);
break;
}
bus_space_write_1(iot, ioh, tmc_ictl, 0);
tout = STG_DELAY_MAX;
while (tout --)
{
status = bus_space_read_1(iot, ioh, tmc_bstat);
if ((status & PHASE_MASK) != DATA_OUT_PHASE)
break;
if (bus_space_read_2(iot, ioh, tmc_fdcnt) != 0)
{
SCSI_LOW_DELAY(1);
continue;
}
for (count = sc->sc_maxwsize; count > 0; count --)
bus_space_write_1(iot, ioh, tmc_wfifo, 0);
}
status = bus_space_read_1(iot, ioh, tmc_bstat);
if ((status & PHASE_MASK) == DATA_OUT_PHASE)
sc->sc_dataout_timeout = SCSI_LOW_TIMEOUT_HZ;
bus_space_write_1(iot, ioh, tmc_ictl, sc->sc_icinit);
break;
default:
break;
}
return 0;
}