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/* $NecBSD: nsp.c,v 1.21.12.6 2001/06/29 06:27:52 honda Exp $ */
/* $NetBSD$ */
#define NSP_DEBUG
#define NSP_STATICS
#define NSP_IO_CONTROL_FLAGS \
(NSP_READ_SUSPEND_IO | NSP_WRITE_SUSPEND_IO | \
NSP_READ_FIFO_INTERRUPTS | NSP_WRITE_FIFO_INTERRUPTS | \
NSP_USE_MEMIO | NSP_WAIT_FOR_SELECT)
/*-
* Copyright (c) 1998, 1999, 2000, 2001
* NetBSD/pc98 porting staff. All rights reserved.
*
* Copyright (c) 1998, 1999, 2000, 2001
* 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/nsp/nsp.c 189004 2009-02-24 18:09:31Z rdivacky $");
#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/nspreg.h>
#include <i386/Cbus/dev/nspvar.h>
#endif /* __NetBSD__ */
#ifdef __FreeBSD__
#include <machine/cpu.h>
#include <machine/bus.h>
#include <compat/netbsd/dvcfg.h>
#include <compat/netbsd/physio_proc.h>
#include <cam/scsi/scsi_low.h>
#include <dev/nsp/nspreg.h>
#include <dev/nsp/nspvar.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
*/
/***************************************************
* PARAMS
***************************************************/
#define NSP_NTARGETS 8
#define NSP_NLUNS 8
#define NSP_MAX_DATA_SIZE (64 * 1024)
#define NSP_SELTIMEOUT (200)
#define NSP_DELAY_MAX (2 * 1000 * 1000)
#define NSP_DELAY_INTERVAL (1)
#define NSP_TIMER_1MS (1000 / 51)
/***************************************************
* DEBUG
***************************************************/
#ifdef NSP_DEBUG
int nsp_debug;
#endif /* NSP_DEBUG */
#ifdef NSP_STATICS
struct nsp_statics {
int arbit_conflict_1;
int arbit_conflict_2;
int device_data_write;
int device_busy;
int disconnect;
int reselect;
int data_phase_bypass;
} nsp_statics;
#endif /* NSP_STATICS */
/***************************************************
* IO control
***************************************************/
#define NSP_READ_SUSPEND_IO 0x0001
#define NSP_WRITE_SUSPEND_IO 0x0002
#define NSP_USE_MEMIO 0x0004
#define NSP_READ_FIFO_INTERRUPTS 0x0010
#define NSP_WRITE_FIFO_INTERRUPTS 0x0020
#define NSP_WAIT_FOR_SELECT 0x0100
u_int nsp_io_control = NSP_IO_CONTROL_FLAGS;
int nsp_read_suspend_bytes = DEV_BSIZE;
int nsp_write_suspend_bytes = DEV_BSIZE;
int nsp_read_interrupt_bytes = 4096;
int nsp_write_interrupt_bytes = 4096;
/***************************************************
* DEVICE STRUCTURE
***************************************************/
extern struct cfdriver nsp_cd;
/**************************************************************
* DECLARE
**************************************************************/
#define NSP_FIFO_ON 1
#define NSP_FIFO_OFF 0
static void nsp_pio_read(struct nsp_softc *, int);
static void nsp_pio_write(struct nsp_softc *, int);
static int nsp_xfer(struct nsp_softc *, u_int8_t *, int, int, int);
static int nsp_msg(struct nsp_softc *, struct targ_info *, u_int);
static int nsp_reselected(struct nsp_softc *);
static int nsp_disconnected(struct nsp_softc *, struct targ_info *);
static void nsp_pdma_end(struct nsp_softc *, struct targ_info *);
static void nsphw_init(struct nsp_softc *);
static int nsp_target_nexus_establish(struct nsp_softc *);
static int nsp_lun_nexus_establish(struct nsp_softc *);
static int nsp_ccb_nexus_establish(struct nsp_softc *);
static int nsp_world_start(struct nsp_softc *, int);
static int nsphw_start_selection(struct nsp_softc *sc, struct slccb *);
static void nsphw_bus_reset(struct nsp_softc *);
static void nsphw_attention(struct nsp_softc *);
static u_int nsp_fifo_count(struct nsp_softc *);
static u_int nsp_request_count(struct nsp_softc *);
static int nsp_negate_signal(struct nsp_softc *, u_int8_t, u_char *);
static int nsp_expect_signal(struct nsp_softc *, u_int8_t, u_int8_t);
static void nsp_start_timer(struct nsp_softc *, int);
static void nsp_setup_fifo(struct nsp_softc *, int, int, int);
static int nsp_targ_init(struct nsp_softc *, struct targ_info *, int);
static void nsphw_selection_done_and_expect_msgout(struct nsp_softc *);
static void nsp_data_padding(struct nsp_softc *, int, u_int);
static int nsp_timeout(struct nsp_softc *);
static int nsp_read_fifo(struct nsp_softc *, int);
static int nsp_write_fifo(struct nsp_softc *, int);
static int nsp_phase_match(struct nsp_softc *, u_int8_t, u_int8_t);
static int nsp_wait_interrupt(struct nsp_softc *);
struct scsi_low_funcs nspfuncs = {
SC_LOW_INIT_T nsp_world_start,
SC_LOW_BUSRST_T nsphw_bus_reset,
SC_LOW_TARG_INIT_T nsp_targ_init,
SC_LOW_LUN_INIT_T NULL,
SC_LOW_SELECT_T nsphw_start_selection,
SC_LOW_NEXUS_T nsp_lun_nexus_establish,
SC_LOW_NEXUS_T nsp_ccb_nexus_establish,
SC_LOW_ATTEN_T nsphw_attention,
SC_LOW_MSG_T nsp_msg,
SC_LOW_TIMEOUT_T nsp_timeout,
SC_LOW_POLL_T nspintr,
NULL,
};
/****************************************************
* hwfuncs
****************************************************/
static __inline u_int8_t nsp_cr_read_1(bus_space_tag_t bst, bus_space_handle_t bsh, bus_addr_t ofs);
static __inline void nsp_cr_write_1(bus_space_tag_t bst, bus_space_handle_t bsh, bus_addr_t ofs, u_int8_t va);
static __inline u_int8_t
nsp_cr_read_1(bst, bsh, ofs)
bus_space_tag_t bst;
bus_space_handle_t bsh;
bus_addr_t ofs;
{
bus_space_write_1(bst, bsh, nsp_idxr, ofs);
return bus_space_read_1(bst, bsh, nsp_datar);
}
static __inline void
nsp_cr_write_1(bus_space_tag_t bst, bus_space_handle_t bsh, bus_addr_t ofs,
u_int8_t va)
{
bus_space_write_1(bst, bsh, nsp_idxr, ofs);
bus_space_write_1(bst, bsh, nsp_datar, va);
}
static int
nsp_expect_signal(struct nsp_softc *sc, u_int8_t curphase, u_int8_t 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, isrc;
for (wc = 0; wc < NSP_DELAY_MAX / NSP_DELAY_INTERVAL; wc ++)
{
ph = nsp_cr_read_1(bst, bsh, NSPR_SCBUSMON);
if (ph == (u_int8_t) -1)
return -1;
isrc = bus_space_read_1(bst, bsh, nsp_irqsr);
if (isrc & IRQSR_SCSI)
return 0;
if ((ph & mask) != 0 && (ph & SCBUSMON_PHMASK) == curphase)
return 1;
SCSI_LOW_DELAY(NSP_DELAY_INTERVAL);
}
printf("%s: nsp_expect_signal timeout\n", slp->sl_xname);
return -1;
}
static void
nsphw_init(sc)
struct nsp_softc *sc;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
/* block all interrupts */
bus_space_write_1(bst, bsh, nsp_irqcr, IRQCR_ALLMASK);
/* setup SCSI interface */
bus_space_write_1(bst, bsh, nsp_ifselr, IFSELR_IFSEL);
nsp_cr_write_1(bst, bsh, NSPR_SCIENR, 0);
nsp_cr_write_1(bst, bsh, NSPR_XFERMR, XFERMR_IO8);
nsp_cr_write_1(bst, bsh, NSPR_CLKDIVR, sc->sc_iclkdiv);
nsp_cr_write_1(bst, bsh, NSPR_SCIENR, sc->sc_icr);
nsp_cr_write_1(bst, bsh, NSPR_PARITYR, sc->sc_parr);
nsp_cr_write_1(bst, bsh, NSPR_PTCLRR,
PTCLRR_ACK | PTCLRR_REQ | PTCLRR_HOST | PTCLRR_RSS);
/* setup fifo asic */
bus_space_write_1(bst, bsh, nsp_ifselr, IFSELR_REGSEL);
nsp_cr_write_1(bst, bsh, NSPR_TERMPWRC, 0);
if ((nsp_cr_read_1(bst, bsh, NSPR_OCR) & OCR_TERMPWRS) == 0)
nsp_cr_write_1(bst, bsh, NSPR_TERMPWRC, TERMPWRC_POWON);
nsp_cr_write_1(bst, bsh, NSPR_XFERMR, XFERMR_IO8);
nsp_cr_write_1(bst, bsh, NSPR_CLKDIVR, sc->sc_clkdiv);
nsp_cr_write_1(bst, bsh, NSPR_TIMERCNT, 0);
nsp_cr_write_1(bst, bsh, NSPR_TIMERCNT, 0);
nsp_cr_write_1(bst, bsh, NSPR_SYNCR, 0);
nsp_cr_write_1(bst, bsh, NSPR_ACKWIDTH, 0);
/* enable interrupts and ack them */
nsp_cr_write_1(bst, bsh, NSPR_SCIENR, sc->sc_icr);
bus_space_write_1(bst, bsh, nsp_irqcr, IRQSR_MASK);
nsp_setup_fifo(sc, NSP_FIFO_OFF, SCSI_LOW_READ, 0);
}
/****************************************************
* scsi low interface
****************************************************/
static void
nsphw_attention(sc)
struct nsp_softc *sc;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
u_int8_t cr;
cr = nsp_cr_read_1(bst, bsh, NSPR_SCBUSCR)/* & ~SCBUSCR_ACK */;
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, cr | SCBUSCR_ATN);
SCSI_LOW_DELAY(10);
}
static void
nsphw_bus_reset(sc)
struct nsp_softc *sc;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
int i;
bus_space_write_1(bst, bsh, nsp_irqcr, IRQCR_ALLMASK);
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, SCBUSCR_RST);
SCSI_LOW_DELAY(100 * 1000); /* 100ms */
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, 0);
for (i = 0; i < 5; i ++)
(void) nsp_cr_read_1(bst, bsh, NSPR_IRQPHS);
bus_space_write_1(bst, bsh, nsp_irqcr, IRQSR_MASK);
}
static void
nsphw_selection_done_and_expect_msgout(sc)
struct nsp_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
/* clear ack counter */
sc->sc_cnt = 0;
nsp_cr_write_1(bst, bsh, NSPR_PTCLRR, PTCLRR_PT | PTCLRR_ACK |
PTCLRR_REQ | PTCLRR_HOST);
/* deassert sel and assert atten */
sc->sc_seltout = 0;
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, sc->sc_busc);
SCSI_LOW_DELAY(1);
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR,
sc->sc_busc | SCBUSCR_ADIR | SCBUSCR_ACKEN);
SCSI_LOW_ASSERT_ATN(slp);
}
static int
nsphw_start_selection(sc, cb)
struct nsp_softc *sc;
struct slccb *cb;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
struct targ_info *ti = cb->ti;
register u_int8_t arbs, ph;
int s, wc;
wc = sc->sc_tmaxcnt = cb->ccb_tcmax * 1000 * 1000;
sc->sc_dataout_timeout = 0;
/* check bus free */
s = splhigh();
ph = nsp_cr_read_1(bst, bsh, NSPR_SCBUSMON);
if (ph != SCBUSMON_FREE)
{
splx(s);
#ifdef NSP_STATICS
nsp_statics.arbit_conflict_1 ++;
#endif /* NSP_STATICS */
return SCSI_LOW_START_FAIL;
}
/* start arbitration */
nsp_cr_write_1(bst, bsh, NSPR_ARBITS, ARBITS_EXEC);
splx(s);
SCSI_LOW_SETUP_PHASE(ti, PH_ARBSTART);
do
{
/* XXX: what a stupid chip! */
arbs = nsp_cr_read_1(bst, bsh, NSPR_ARBITS);
SCSI_LOW_DELAY(1);
}
while ((arbs & (ARBITS_WIN | ARBITS_FAIL)) == 0 && wc -- > 0);
if ((arbs & ARBITS_WIN) == 0)
{
nsp_cr_write_1(bst, bsh, NSPR_ARBITS, ARBITS_CLR);
#ifdef NSP_STATICS
nsp_statics.arbit_conflict_2 ++;
#endif /* NSP_STATICS */
return SCSI_LOW_START_FAIL;
}
/* assert select line */
SCSI_LOW_SETUP_PHASE(ti, PH_SELSTART);
scsi_low_arbit_win(slp);
s = splhigh();
SCSI_LOW_DELAY(3);
nsp_cr_write_1(bst, bsh, NSPR_DATA,
sc->sc_idbit | (1 << ti->ti_id));
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR,
SCBUSCR_SEL | SCBUSCR_BSY | sc->sc_busc);
SCSI_LOW_DELAY(3);
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, SCBUSCR_SEL |
SCBUSCR_BSY | SCBUSCR_DOUT | sc->sc_busc);
nsp_cr_write_1(bst, bsh, NSPR_ARBITS, ARBITS_CLR);
SCSI_LOW_DELAY(3);
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR,
SCBUSCR_SEL | SCBUSCR_DOUT | sc->sc_busc);
SCSI_LOW_DELAY(1);
if ((nsp_io_control & NSP_WAIT_FOR_SELECT) != 0)
{
#define NSP_FIRST_SEL_WAIT 300
#define NSP_SEL_CHECK_INTERVAL 10
/* wait for a selection response */
for (wc = 0; wc < NSP_FIRST_SEL_WAIT / NSP_SEL_CHECK_INTERVAL;
wc ++)
{
ph = nsp_cr_read_1(bst, bsh, NSPR_SCBUSMON);
if ((ph & SCBUSMON_BSY) == 0)
{
SCSI_LOW_DELAY(NSP_SEL_CHECK_INTERVAL);
continue;
}
SCSI_LOW_DELAY(1);
ph = nsp_cr_read_1(bst, bsh, NSPR_SCBUSMON);
if ((ph & SCBUSMON_BSY) != 0)
{
nsphw_selection_done_and_expect_msgout(sc);
splx(s);
SCSI_LOW_SETUP_PHASE(ti, PH_SELECTED);
return SCSI_LOW_START_OK;
}
}
}
splx(s);
/* check a selection timeout */
nsp_start_timer(sc, NSP_TIMER_1MS);
sc->sc_seltout = 1;
return SCSI_LOW_START_OK;
}
static int
nsp_world_start(sc, fdone)
struct nsp_softc *sc;
int fdone;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
sc->sc_cnt = 0;
sc->sc_seltout = 0;
if ((slp->sl_cfgflags & CFG_NOATTEN) == 0)
sc->sc_busc = SCBUSCR_ATN;
else
sc->sc_busc = 0;
if ((slp->sl_cfgflags & CFG_NOPARITY) == 0)
sc->sc_parr = PARITYR_ENABLE | PARITYR_CLEAR;
else
sc->sc_parr = 0;
sc->sc_icr = (SCIENR_SCCHG | SCIENR_RESEL | SCIENR_RST);
nsphw_init(sc);
scsi_low_bus_reset(slp);
SOFT_INTR_REQUIRED(slp);
return 0;
}
struct ncp_synch_data {
u_int min_period;
u_int max_period;
u_int chip_period;
u_int ack_width;
};
static struct ncp_synch_data ncp_sync_data_40M[] = {
{0x0c,0x0c,0x1,0}, /* 20MB 50ns*/
{0x19,0x19,0x3,1}, /* 10MB 100ns*/
{0x1a,0x25,0x5,2}, /* 7.5MB 150ns*/
{0x26,0x32,0x7,3}, /* 5MB 200ns*/
{0x0, 0, 0, 0}
};
static struct ncp_synch_data ncp_sync_data_20M[] = {
{0x19,0x19,0x1,0}, /* 10MB 100ns*/
{0x1a,0x25,0x2,0}, /* 7.5MB 150ns*/
{0x26,0x32,0x3,1}, /* 5MB 200ns*/
{0x0, 0, 0, 0}
};
static int
nsp_msg(sc, ti, msg)
struct nsp_softc *sc;
struct targ_info *ti;
u_int msg;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
struct ncp_synch_data *sdp;
struct nsp_targ_info *nti = (void *) ti;
u_int period, offset;
int i, error;
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;
if (sc->sc_iclkdiv == CLKDIVR_20M)
sdp = &ncp_sync_data_20M[0];
else
sdp = &ncp_sync_data_40M[0];
for (i = 0; sdp->max_period != 0; i ++, sdp ++)
{
if (period >= sdp->min_period && period <= sdp->max_period)
break;
}
if (period != 0 && sdp->max_period == 0)
{
/*
* NO proper period/offset found,
* Retry neg with the target.
*/
ti->ti_maxsynch.period = 0;
ti->ti_maxsynch.offset = 0;
nti->nti_reg_syncr = 0;
nti->nti_reg_ackwidth = 0;
error = EINVAL;
}
else
{
nti->nti_reg_syncr = (sdp->chip_period << SYNCR_PERS) |
(offset & SYNCR_OFFM);
nti->nti_reg_ackwidth = sdp->ack_width;
error = 0;
}
nsp_cr_write_1(bst, bsh, NSPR_SYNCR, nti->nti_reg_syncr);
nsp_cr_write_1(bst, bsh, NSPR_ACKWIDTH, nti->nti_reg_ackwidth);
return error;
}
static int
nsp_targ_init(sc, ti, action)
struct nsp_softc *sc;
struct targ_info *ti;
int action;
{
struct nsp_targ_info *nti = (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 = 100 / 4;
ti->ti_maxsynch.offset = 15;
nti->nti_reg_syncr = 0;
nti->nti_reg_ackwidth = 0;
}
return 0;
}
static void
nsp_start_timer(sc, time)
struct nsp_softc *sc;
int time;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
sc->sc_timer = time;
nsp_cr_write_1(bst, bsh, NSPR_TIMERCNT, time);
}
/**************************************************************
* General probe attach
**************************************************************/
int
nspprobesubr(iot, ioh, dvcfg)
bus_space_tag_t iot;
bus_space_handle_t ioh;
u_int dvcfg;
{
u_int8_t regv;
regv = bus_space_read_1(iot, ioh, nsp_fifosr);
if (regv < 0x11 || regv >= 0x20)
return 0;
return 1;
}
int
nspprint(aux, name)
void *aux;
const char *name;
{
if (name != NULL)
printf("%s: scsibus ", name);
return UNCONF;
}
void
nspattachsubr(sc)
struct nsp_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
printf("\n");
sc->sc_idbit = (1 << slp->sl_hostid);
slp->sl_flags |= HW_READ_PADDING;
slp->sl_funcs = &nspfuncs;
sc->sc_tmaxcnt = SCSI_LOW_MIN_TOUT * 1000 * 1000; /* default */
(void) scsi_low_attach(slp, 0, NSP_NTARGETS, NSP_NLUNS,
sizeof(struct nsp_targ_info), 0);
}
/**************************************************************
* PDMA functions
**************************************************************/
static u_int
nsp_fifo_count(sc)
struct nsp_softc *sc;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
u_int count;
nsp_cr_write_1(bst, bsh, NSPR_PTCLRR, PTCLRR_RSS_ACK | PTCLRR_PT);
count = bus_space_read_1(bst, bsh, nsp_datar);
count += (((u_int) bus_space_read_1(bst, bsh, nsp_datar)) << 8);
count += (((u_int) bus_space_read_1(bst, bsh, nsp_datar)) << 16);
return count;
}
static u_int
nsp_request_count(sc)
struct nsp_softc *sc;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
u_int count;
nsp_cr_write_1(bst, bsh, NSPR_PTCLRR, PTCLRR_RSS_REQ | PTCLRR_PT);
count = bus_space_read_1(bst, bsh, nsp_datar);
count += (((u_int) bus_space_read_1(bst, bsh, nsp_datar)) << 8);
count += (((u_int) bus_space_read_1(bst, bsh, nsp_datar)) << 16);
return count;
}
static void
nsp_setup_fifo(sc, on, direction, datalen)
struct nsp_softc *sc;
int on;
int direction;
int datalen;
{
u_int8_t xfermode;
sc->sc_suspendio = 0;
if (on == NSP_FIFO_OFF)
{
xfermode = XFERMR_IO8;
goto out;
}
/* check if suspend io OK ? */
if (datalen > 0)
{
if (direction == SCSI_LOW_READ)
{
if ((nsp_io_control & NSP_READ_SUSPEND_IO) != 0 &&
(datalen % nsp_read_suspend_bytes) == 0)
sc->sc_suspendio = nsp_read_suspend_bytes;
}
else
{
if ((nsp_io_control & NSP_WRITE_SUSPEND_IO) != 0 &&
(datalen % nsp_write_suspend_bytes) == 0)
sc->sc_suspendio = nsp_write_suspend_bytes;
}
}
/* determine a transfer type */
if (datalen < DEV_BSIZE || (datalen & 3) != 0)
{
if (sc->sc_memh != 0 &&
(nsp_io_control & NSP_USE_MEMIO) != 0)
xfermode = XFERMR_XEN | XFERMR_MEM8;
else
xfermode = XFERMR_XEN | XFERMR_IO8;
}
else
{
if (sc->sc_memh != 0 &&
(nsp_io_control & NSP_USE_MEMIO) != 0)
xfermode = XFERMR_XEN | XFERMR_MEM32;
else
xfermode = XFERMR_XEN | XFERMR_IO32;
if (sc->sc_suspendio > 0)
xfermode |= XFERMR_FIFOEN;
}
out:
sc->sc_xfermr = xfermode;
nsp_cr_write_1(sc->sc_iot, sc->sc_ioh, NSPR_XFERMR, sc->sc_xfermr);
}
static void
nsp_pdma_end(sc, ti)
struct nsp_softc *sc;
struct targ_info *ti;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
struct slccb *cb = slp->sl_Qnexus;
u_int len = 0, cnt;
sc->sc_dataout_timeout = 0;
slp->sl_flags &= ~HW_PDMASTART;
nsp_setup_fifo(sc, NSP_FIFO_OFF, SCSI_LOW_READ, 0);
if ((sc->sc_icr & SCIENR_FIFO) != 0)
{
sc->sc_icr &= ~SCIENR_FIFO;
nsp_cr_write_1(sc->sc_iot, sc->sc_ioh, NSPR_SCIENR, sc->sc_icr);
}
if (cb == NULL)
{
slp->sl_error |= PDMAERR;
return;
}
if (ti->ti_phase == PH_DATA)
{
cnt = nsp_fifo_count(sc);
if (slp->sl_scp.scp_direction == SCSI_LOW_WRITE)
{
len = sc->sc_cnt - cnt;
if (sc->sc_cnt >= cnt &&
slp->sl_scp.scp_datalen + len <=
cb->ccb_scp.scp_datalen)
{
slp->sl_scp.scp_data -= len;
slp->sl_scp.scp_datalen += len;
}
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 (sc->sc_cnt != cnt ||
sc->sc_cnt > cb->ccb_scp.scp_datalen)
{
slp->sl_error |= PDMAERR;
printf("%s: data read count error %x != %x (%x)\n",
slp->sl_xname, sc->sc_cnt, cnt,
cb->ccb_scp.scp_datalen);
}
}
sc->sc_cnt = cnt;
scsi_low_data_finish(slp);
}
else
{
printf("%s data phase miss\n", slp->sl_xname);
slp->sl_error |= PDMAERR;
}
}
#define RFIFO_CRIT 64
#define WFIFO_CRIT 32
static void
nsp_data_padding(sc, direction, count)
struct nsp_softc *sc;
int direction;
u_int count;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
if (count > NSP_MAX_DATA_SIZE)
count = NSP_MAX_DATA_SIZE;
nsp_cr_write_1(bst, bsh, NSPR_XFERMR, XFERMR_XEN | XFERMR_IO8);
if (direction == SCSI_LOW_READ)
{
while (count -- > 0)
(void) bus_space_read_1(bst, bsh, nsp_fifodr);
}
else
{
while (count -- > 0)
(void) bus_space_write_1(bst, bsh, nsp_fifodr, 0);
}
nsp_cr_write_1(bst, bsh, NSPR_XFERMR, sc->sc_xfermr);
}
static int
nsp_read_fifo(sc, suspendio)
struct nsp_softc *sc;
int suspendio;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
u_int res;
res = nsp_fifo_count(sc);
if (res == sc->sc_cnt)
return 0;
#ifdef NSP_DEBUG
if (res < sc->sc_cnt || res == (u_int) -1)
{
printf("%s: strange fifo ack count 0x%x < 0x%x\n",
slp->sl_xname, res, sc->sc_cnt);
return 0;
}
#endif /* NSP_DEBUG */
res = res - sc->sc_cnt;
if (res > slp->sl_scp.scp_datalen)
{
if ((slp->sl_error & PDMAERR) == 0)
{
printf("%s: data overrun 0x%x > 0x%x\n",
slp->sl_xname, res, slp->sl_scp.scp_datalen);
}
slp->sl_error |= PDMAERR;
slp->sl_scp.scp_datalen = 0;
if ((slp->sl_flags & HW_READ_PADDING) == 0)
{
printf("%s: read padding required\n", slp->sl_xname);
return 0;
}
nsp_data_padding(sc, SCSI_LOW_READ, res);
sc->sc_cnt += res;
return 1; /* padding start */
}
if (suspendio > 0 && slp->sl_scp.scp_datalen >= suspendio)
res = suspendio;
if ((sc->sc_xfermr & (XFERMR_MEM32 | XFERMR_MEM8)) != 0)
{
if ((sc->sc_xfermr & XFERMR_MEM32) != 0)
{
res &= ~3;
bus_space_read_region_4(sc->sc_memt, sc->sc_memh, 0,
(u_int32_t *) slp->sl_scp.scp_data, res >> 2);
}
else
{
bus_space_read_region_1(sc->sc_memt, sc->sc_memh, 0,
(u_int8_t *) slp->sl_scp.scp_data, res);
}
}
else
{
if ((sc->sc_xfermr & XFERMR_IO32) != 0)
{
res &= ~3;
bus_space_read_multi_4(bst, bsh, nsp_fifodr,
(u_int32_t *) slp->sl_scp.scp_data, res >> 2);
}
else
{
bus_space_read_multi_1(bst, bsh, nsp_fifodr,
(u_int8_t *) slp->sl_scp.scp_data, res);
}
}
if (nsp_cr_read_1(bst, bsh, NSPR_PARITYR) & PARITYR_PE)
{
nsp_cr_write_1(bst, bsh, NSPR_PARITYR,
PARITYR_ENABLE | PARITYR_CLEAR);
scsi_low_assert_msg(slp, slp->sl_Tnexus, SCSI_LOW_MSG_ERROR, 1);
}
slp->sl_scp.scp_data += res;
slp->sl_scp.scp_datalen -= res;
sc->sc_cnt += res;
return 0;
}
static int
nsp_write_fifo(sc, suspendio)
struct nsp_softc *sc;
int suspendio;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
u_int res;
register u_int8_t stat;
if (suspendio > 0)
{
#ifdef NSP_DEBUG
if ((slp->sl_scp.scp_datalen % WFIFO_CRIT) != 0)
{
printf("%s: strange write length 0x%x\n",
slp->sl_xname, slp->sl_scp.scp_datalen);
}
#endif /* NSP_DEBUG */
res = slp->sl_scp.scp_datalen % suspendio;
if (res == 0)
{
res = suspendio;
}
}
else
{
res = WFIFO_CRIT;
}
if (res > slp->sl_scp.scp_datalen)
res = slp->sl_scp.scp_datalen;
/* XXX: reconfirm! */
stat = nsp_cr_read_1(bst, bsh, NSPR_SCBUSMON) & SCBUSMON_PHMASK;
if (stat != PHASE_DATAOUT)
return 0;
if ((sc->sc_xfermr & (XFERMR_MEM32 | XFERMR_MEM8)) != 0)
{
if ((sc->sc_xfermr & XFERMR_MEM32) != 0)
{
bus_space_write_region_4(sc->sc_memt, sc->sc_memh, 0,
(u_int32_t *) slp->sl_scp.scp_data, res >> 2);
}
else
{
bus_space_write_region_1(sc->sc_memt, sc->sc_memh, 0,
(u_int8_t *) slp->sl_scp.scp_data, res);
}
}
else
{
if ((sc->sc_xfermr & XFERMR_IO32) != 0)
{
bus_space_write_multi_4(bst, bsh, nsp_fifodr,
(u_int32_t *) slp->sl_scp.scp_data, res >> 2);
}
else
{
bus_space_write_multi_1(bst, bsh, nsp_fifodr,
(u_int8_t *) slp->sl_scp.scp_data, res);
}
}
slp->sl_scp.scp_datalen -= res;
slp->sl_scp.scp_data += res;
sc->sc_cnt += res;
return 0;
}
static int
nsp_wait_interrupt(sc)
struct nsp_softc *sc;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
int tout;
register u_int8_t isrc;
for (tout = 0; tout < DEV_BSIZE / 10; tout ++)
{
isrc = bus_space_read_1(bst, bsh, nsp_irqsr);
if ((isrc & (IRQSR_SCSI | IRQSR_FIFO)) != 0)
{
if ((isrc & IRQSR_FIFO) != 0)
{
bus_space_write_1(bst, bsh,
nsp_irqcr, IRQCR_FIFOCL);
}
return 1;
}
SCSI_LOW_DELAY(1);
}
return 0;
}
static void
nsp_pio_read(sc, suspendio)
struct nsp_softc *sc;
int suspendio;
{
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 tout, padding, datalen;
register u_int8_t stat, fstat;
padding = 0;
tout = sc->sc_tmaxcnt;
slp->sl_flags |= HW_PDMASTART;
datalen = slp->sl_scp.scp_datalen;
ReadLoop:
while (1)
{
stat = nsp_cr_read_1(bst, bsh, NSPR_SCBUSMON);
if (stat == (u_int8_t) -1)
return;
/* out of data phase */
if ((stat & SCBUSMON_PHMASK) != PHASE_DATAIN)
{
nsp_read_fifo(sc, 0);
return;
}
/* data phase */
fstat = bus_space_read_1(bst, bsh, nsp_fifosr);
if ((fstat & FIFOSR_FULLEMP) != 0)
{
if ((sc->sc_icr & SCIENR_FIFO) != 0)
{
bus_space_write_1(bst, bsh, nsp_irqcr,
IRQCR_FIFOCL);
}
if (suspendio > 0)
{
padding |= nsp_read_fifo(sc, suspendio);
}
else
{
padding |= nsp_read_fifo(sc, 0);
}
if ((sc->sc_icr & SCIENR_FIFO) != 0)
break;
}
else
{
if (padding == 0 && slp->sl_scp.scp_datalen <= 0)
return;
if ((sc->sc_icr & SCIENR_FIFO) != 0)
break;
SCSI_LOW_DELAY(1);
}
if ((-- tout) <= 0)
{
printf("%s: nsp_pio_read: timeout\n", slp->sl_xname);
return;
}
}
if (slp->sl_scp.scp_datalen > 0 &&
slp->sl_scp.scp_datalen > datalen - nsp_read_interrupt_bytes)
{
if (nsp_wait_interrupt(sc) != 0)
goto ReadLoop;
}
}
static void
nsp_pio_write(sc, suspendio)
struct nsp_softc *sc;
int suspendio;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
u_int rcount, acount;
int tout, datalen;
register u_int8_t stat, fstat;
tout = sc->sc_tmaxcnt;
slp->sl_flags |= HW_PDMASTART;
datalen = slp->sl_scp.scp_datalen;
WriteLoop:
while (1)
{
stat = nsp_cr_read_1(bst, bsh, NSPR_SCBUSMON) & SCBUSMON_PHMASK;
if (stat != PHASE_DATAOUT)
return;
if (slp->sl_scp.scp_datalen <= 0)
{
if (sc->sc_dataout_timeout == 0)
sc->sc_dataout_timeout = SCSI_LOW_TIMEOUT_HZ;
return;
}
fstat = bus_space_read_1(bst, bsh, nsp_fifosr);
if ((fstat & FIFOSR_FULLEMP) != 0)
{
if ((sc->sc_icr & SCIENR_FIFO) != 0)
{
bus_space_write_1(bst, bsh, nsp_irqcr,
IRQCR_FIFOCL);
}
if (suspendio > 0)
{
/* XXX:IMPORTANT:
* To avoid timeout of pcmcia bus
* (not scsi bus!), we should check
* the scsi device sends us request
* signals, which means the scsi device
* is ready to recieve data without
* heavy delays.
*/
if ((slp->sl_scp.scp_datalen % suspendio) == 0)
{
/* Step I:
* fill the nsp fifo, and waiting for
* the fifo empty.
*/
nsp_write_fifo(sc, 0);
}
else
{
/* Step II:
* check the request singals.
*/
acount = nsp_fifo_count(sc);
rcount = nsp_request_count(sc);
if (rcount <= acount)
{
nsp_write_fifo(sc, 0);
#ifdef NSP_STATICS
nsp_statics.device_busy ++;
#endif /* NSP_STATICS */
}
else
{
nsp_write_fifo(sc, suspendio);
#ifdef NSP_STATICS
nsp_statics.device_data_write ++;
#endif /* NSP_STATICS */
}
}
}
else
{
nsp_write_fifo(sc, 0);
}
if ((sc->sc_icr & SCIENR_FIFO) != 0)
break;
}
else
{
if ((sc->sc_icr & SCIENR_FIFO) != 0)
break;
SCSI_LOW_DELAY(1);
}
if ((-- tout) <= 0)
{
printf("%s: nsp_pio_write: timeout\n", slp->sl_xname);
return;
}
}
if (slp->sl_scp.scp_datalen > 0 &&
slp->sl_scp.scp_datalen > datalen - nsp_write_interrupt_bytes)
{
if (nsp_wait_interrupt(sc) != 0)
goto WriteLoop;
}
}
static int
nsp_negate_signal(struct nsp_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 < NSP_DELAY_MAX / NSP_DELAY_INTERVAL; wc ++)
{
regv = nsp_cr_read_1(bst, bsh, NSPR_SCBUSMON);
if (regv == (u_int8_t) -1)
return -1;
if ((regv & mask) == 0)
return 1;
SCSI_LOW_DELAY(NSP_DELAY_INTERVAL);
}
printf("%s: %s nsp_negate_signal timeout\n", slp->sl_xname, s);
return -1;
}
static int
nsp_xfer(sc, buf, len, phase, clear_atn)
struct nsp_softc *sc;
u_int8_t *buf;
int len;
int phase;
int clear_atn;
{
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
int ptr, rv;
for (ptr = 0; len > 0; len --, ptr ++)
{
rv = nsp_expect_signal(sc, phase, SCBUSMON_REQ);
if (rv <= 0)
goto out;
if (len == 1 && clear_atn != 0)
{
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR,
SCBUSCR_ADIR | SCBUSCR_ACKEN);
SCSI_LOW_DEASSERT_ATN(&sc->sc_sclow);
}
if (phase & SCBUSMON_IO)
{
buf[ptr] = nsp_cr_read_1(bst, bsh, NSPR_DATAACK);
}
else
{
nsp_cr_write_1(bst, bsh, NSPR_DATAACK, buf[ptr]);
}
nsp_negate_signal(sc, SCBUSMON_ACK, "xfer<ACK>");
}
out:
return len;
}
/**************************************************************
* disconnect & reselect (HW low)
**************************************************************/
static int
nsp_reselected(sc)
struct nsp_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
struct targ_info *ti;
u_int sid;
u_int8_t cr;
sid = (u_int) nsp_cr_read_1(bst, bsh, NSPR_RESELR);
sid &= ~sc->sc_idbit;
sid = ffs(sid) - 1;
if ((ti = scsi_low_reselected(slp, sid)) == NULL)
return EJUSTRETURN;
nsp_negate_signal(sc, SCBUSMON_SEL, "reselect<SEL>");
cr = nsp_cr_read_1(bst, bsh, NSPR_SCBUSCR);
cr &= ~(SCBUSCR_BSY | SCBUSCR_ATN);
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, cr);
cr |= SCBUSCR_ADIR | SCBUSCR_ACKEN;
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, cr);
#ifdef NSP_STATICS
nsp_statics.reselect ++;
#endif /* NSP_STATCIS */
return EJUSTRETURN;
}
static int
nsp_disconnected(sc, ti)
struct nsp_softc *sc;
struct targ_info *ti;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
nsp_cr_write_1(bst, bsh, NSPR_PTCLRR, PTCLRR_PT | PTCLRR_ACK |
PTCLRR_REQ | PTCLRR_HOST);
if ((sc->sc_icr & SCIENR_FIFO) != 0)
{
sc->sc_icr &= ~SCIENR_FIFO;
nsp_cr_write_1(bst, bsh, NSPR_SCIENR, sc->sc_icr);
}
sc->sc_cnt = 0;
sc->sc_dataout_timeout = 0;
#ifdef NSP_STATICS
nsp_statics.disconnect ++;
#endif /* NSP_STATICS */
scsi_low_disconnected(slp, ti);
return 1;
}
/**************************************************************
* SEQUENCER
**************************************************************/
static void nsp_error(struct nsp_softc *, u_char *, u_int8_t, u_int8_t, u_int8_t);
static void
nsp_error(struct nsp_softc * sc, u_char *s, u_int8_t isrc, u_int8_t ph,
u_int8_t irqphs)
{
struct scsi_low_softc *slp = &sc->sc_sclow;
printf("%s: %s\n", slp->sl_xname, s);
printf("%s: isrc 0x%x scmon 0x%x irqphs 0x%x\n",
slp->sl_xname, (u_int) isrc, (u_int) ph, (u_int) irqphs);
}
static int
nsp_target_nexus_establish(sc)
struct nsp_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
struct targ_info *ti = slp->sl_Tnexus;
struct nsp_targ_info *nti = (void *) ti;
/* setup synch transfer registers */
nsp_cr_write_1(bst, bsh, NSPR_SYNCR, nti->nti_reg_syncr);
nsp_cr_write_1(bst, bsh, NSPR_ACKWIDTH, nti->nti_reg_ackwidth);
/* setup pdma fifo (minimum) */
nsp_setup_fifo(sc, NSP_FIFO_ON, SCSI_LOW_READ, 0);
return 0;
}
static int
nsp_lun_nexus_establish(sc)
struct nsp_softc *sc;
{
return 0;
}
static int
nsp_ccb_nexus_establish(sc)
struct nsp_softc *sc;
{
struct scsi_low_softc *slp = &sc->sc_sclow;
struct slccb *cb = slp->sl_Qnexus;
sc->sc_tmaxcnt = cb->ccb_tcmax * 1000 * 1000;
/* setup pdma fifo */
nsp_setup_fifo(sc, NSP_FIFO_ON,
slp->sl_scp.scp_direction, slp->sl_scp.scp_datalen);
if (slp->sl_scp.scp_direction == SCSI_LOW_READ)
{
if (sc->sc_suspendio > 0 &&
(nsp_io_control & NSP_READ_FIFO_INTERRUPTS) != 0)
{
sc->sc_icr |= SCIENR_FIFO;
nsp_cr_write_1(sc->sc_iot, sc->sc_ioh,
NSPR_SCIENR, sc->sc_icr);
}
}
else
{
if (sc->sc_suspendio > 0 &&
(nsp_io_control & NSP_WRITE_FIFO_INTERRUPTS) != 0)
{
sc->sc_icr |= SCIENR_FIFO;
nsp_cr_write_1(sc->sc_iot, sc->sc_ioh,
NSPR_SCIENR, sc->sc_icr);
}
}
return 0;
}
static int
nsp_phase_match(struct nsp_softc *sc, u_int8_t phase, u_int8_t stat)
{
struct scsi_low_softc *slp = &sc->sc_sclow;
if ((stat & SCBUSMON_PHMASK) != phase)
{
printf("%s: phase mismatch 0x%x != 0x%x\n",
slp->sl_xname, (u_int) phase, (u_int) stat);
return EINVAL;
}
if ((stat & SCBUSMON_REQ) == 0)
return EINVAL;
return 0;
}
int
nspintr(arg)
void *arg;
{
struct nsp_softc *sc = arg;
struct scsi_low_softc *slp = &sc->sc_sclow;
bus_space_tag_t bst = sc->sc_iot;
bus_space_handle_t bsh = sc->sc_ioh;
struct targ_info *ti;
struct physio_proc *pp;
struct buf *bp;
u_int derror, flags;
int len, rv;
u_int8_t isrc, ph, irqphs, cr, regv;
/*******************************************
* interrupt check
*******************************************/
if (slp->sl_flags & HW_INACTIVE)
return 0;
bus_space_write_1(bst, bsh, nsp_irqcr, IRQCR_IRQDIS);
isrc = bus_space_read_1(bst, bsh, nsp_irqsr);
if (isrc == (u_int8_t) -1 || (isrc & IRQSR_MASK) == 0)
{
bus_space_write_1(bst, bsh, nsp_irqcr, 0);
return 0;
}
/* XXX: IMPORTANT
* Do not read an irqphs register if no scsi phase interrupt.
* Unless, you should lose a scsi phase interrupt.
*/
ph = nsp_cr_read_1(bst, bsh, NSPR_SCBUSMON);
if ((isrc & IRQSR_SCSI) != 0)
{
irqphs = nsp_cr_read_1(bst, bsh, NSPR_IRQPHS);
}
else
irqphs = 0;
/*
* timer interrupt handler (scsi vs timer interrupts)
*/
if (sc->sc_timer != 0)
{
nsp_cr_write_1(bst, bsh, NSPR_TIMERCNT, 0);
nsp_cr_write_1(bst, bsh, NSPR_TIMERCNT, 0);
sc->sc_timer = 0;
}
/* check a timer interrupt */
regv = 0;
if ((isrc & IRQSR_TIMER) != 0)
{
if ((isrc & IRQSR_MASK) == IRQSR_TIMER && sc->sc_seltout == 0)
{
bus_space_write_1(bst, bsh, nsp_irqcr, IRQCR_TIMERCL);
return 1;
}
regv |= IRQCR_TIMERCL;
}
/* check a fifo interrupt */
if ((isrc & IRQSR_FIFO) != 0)
{
regv |= IRQCR_FIFOCL;
}
/* OK. enable all interrupts */
bus_space_write_1(bst, bsh, nsp_irqcr, regv);
/*******************************************
* debug section
*******************************************/
#ifdef NSP_DEBUG
if (nsp_debug)
{
nsp_error(sc, "current status", isrc, ph, irqphs);
scsi_low_print(slp, NULL);
#ifdef KDB
if (nsp_debug > 1)
SCSI_LOW_DEBUGGER("nsp");
#endif /* KDB */
}
#endif /* NSP_DEBUG */
/*******************************************
* Parse hardware SCSI irq reasons register
*******************************************/
if ((isrc & IRQSR_SCSI) != 0)
{
if ((irqphs & IRQPHS_RST) != 0)
{
scsi_low_restart(slp, SCSI_LOW_RESTART_SOFT,
"bus reset (power off?)");
return 1;
}
if ((irqphs & IRQPHS_RSEL) != 0)
{
bus_space_write_1(bst, bsh, nsp_irqcr, IRQCR_RESCL);
if (nsp_reselected(sc) == EJUSTRETURN)
return 1;
}
if ((irqphs & (IRQPHS_PCHG | IRQPHS_LBF)) == 0)
return 1;
}
/*******************************************
* nexus check
*******************************************/
if ((ti = slp->sl_Tnexus) == NULL)
{
/* unknown scsi phase changes */
nsp_error(sc, "unknown scsi phase changes", isrc, ph, irqphs);
return 0;
}
/*******************************************
* aribitration & selection
*******************************************/
switch (ti->ti_phase)
{
case PH_SELSTART:
if ((ph & SCBUSMON_BSY) == 0)
{
if (sc->sc_seltout >= NSP_SELTIMEOUT)
{
sc->sc_seltout = 0;
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, 0);
return nsp_disconnected(sc, ti);
}
sc->sc_seltout ++;
nsp_start_timer(sc, NSP_TIMER_1MS);
return 1;
}
SCSI_LOW_SETUP_PHASE(ti, PH_SELECTED);
nsphw_selection_done_and_expect_msgout(sc);
return 1;
case PH_SELECTED:
if ((isrc & IRQSR_SCSI) == 0)
return 1;
nsp_target_nexus_establish(sc);
break;
case PH_RESEL:
if ((isrc & IRQSR_SCSI) == 0)
return 1;
nsp_target_nexus_establish(sc);
if ((ph & SCBUSMON_PHMASK) != PHASE_MSGIN)
{
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);
return 1;
}
break;
case PH_DATA:
if ((isrc & IRQSR_SCSI) != 0)
break;
if ((isrc & IRQSR_FIFO) != 0)
{
if (NSP_IS_PHASE_DATA(ph) == 0)
return 1;
irqphs = (ph & IRQPHS_PHMASK);
break;
}
return 1;
default:
if ((isrc & IRQSR_SCSI) == 0)
return 1;
break;
}
/*******************************************
* data phase control
*******************************************/
if (slp->sl_flags & HW_PDMASTART)
{
if ((isrc & IRQSR_SCSI) != 0 &&
NSP_IS_IRQPHS_DATA(irqphs) == 0)
{
if (slp->sl_scp.scp_direction == SCSI_LOW_READ)
nsp_pio_read(sc, 0);
nsp_pdma_end(sc, ti);
}
}
/*******************************************
* scsi seq
*******************************************/
if (slp->sl_msgphase != 0 && (irqphs & IRQPHS_LBF) != 0)
return nsp_disconnected(sc, ti);
/* check unexpected bus free state */
if (ph == 0)
{
nsp_error(sc, "unexpected bus free", isrc, ph, irqphs);
return nsp_disconnected(sc, ti);
}
/* check normal scsi phase */
switch (irqphs & IRQPHS_PHMASK)
{
case IRQPHS_CMD:
if (nsp_phase_match(sc, PHASE_CMD, ph) != 0)
return 1;
SCSI_LOW_SETUP_PHASE(ti, PH_CMD);
if (scsi_low_cmd(slp, ti) != 0)
{
scsi_low_attention(slp);
}
nsp_cr_write_1(bst, bsh, NSPR_CMDCR, CMDCR_PTCLR);
for (len = 0; len < slp->sl_scp.scp_cmdlen; len ++)
nsp_cr_write_1(bst, bsh, NSPR_CMDDR,
slp->sl_scp.scp_cmd[len]);
nsp_cr_write_1(bst, bsh, NSPR_CMDCR, CMDCR_PTCLR | CMDCR_EXEC);
break;
case IRQPHS_DATAOUT:
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);
nsp_pio_write(sc, sc->sc_suspendio);
physio_proc_leave(pp);
break;
case IRQPHS_DATAIN:
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);
nsp_pio_read(sc, sc->sc_suspendio);
physio_proc_leave(pp);
break;
case IRQPHS_STATUS:
if (nsp_phase_match(sc, PHASE_STATUS, ph) != 0)
return 1;
SCSI_LOW_SETUP_PHASE(ti, PH_STAT);
regv = nsp_cr_read_1(bst, bsh, NSPR_DATA);
if (nsp_cr_read_1(bst, bsh, NSPR_PARITYR) & PARITYR_PE)
{
nsp_cr_write_1(bst, bsh, NSPR_PARITYR,
PARITYR_ENABLE | PARITYR_CLEAR);
derror = SCSI_LOW_DATA_PE;
}
else
derror = 0;
/* assert ACK */
cr = SCBUSCR_ACK | nsp_cr_read_1(bst, bsh, NSPR_SCBUSCR);
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, cr);
if (scsi_low_statusin(slp, ti, derror | regv) != 0)
{
scsi_low_attention(slp);
}
/* check REQ nagated */
nsp_negate_signal(sc, SCBUSMON_REQ, "statin<REQ>");
/* deassert ACK */
cr = nsp_cr_read_1(bst, bsh, NSPR_SCBUSCR) & (~SCBUSCR_ACK);
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, cr);
break;
case IRQPHS_MSGOUT:
if (nsp_phase_match(sc, PHASE_MSGOUT, ph) != 0)
return 1;
#ifdef NSP_MSGOUT_SERIALIZE
/*
* XXX: NSP QUIRK
* NSP invoke interrupts only in the case of scsi phase changes,
* therefore we should poll the scsi phase here to catch
* the next "msg out" if exists (no scsi phase changes).
*/
rv = len = 16;
do {
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 (nsp_xfer(sc, ti->ti_msgoutstr, len, PHASE_MSGOUT,
slp->sl_clear_atten) != 0)
{
slp->sl_error |= FATALIO;
nsp_error(sc, "MSGOUT: xfer short",
isrc, ph, irqphs);
}
/* catch a next signal */
rv = nsp_expect_signal(sc, PHASE_MSGOUT, SCBUSMON_REQ);
}
while (rv > 0 && len -- > 0);
#else /* !NSP_MSGOUT_SERIALIZE */
SCSI_LOW_SETUP_PHASE(ti, PH_MSGOUT);
flags = SCSI_LOW_MSGOUT_UNIFY;
if (ti->ti_ophase != ti->ti_phase)
flags |= SCSI_LOW_MSGOUT_INIT;
len = scsi_low_msgout(slp, ti, flags);
if (len > 1 && slp->sl_atten == 0)
{
scsi_low_attention(slp);
}
if (nsp_xfer(sc, ti->ti_msgoutstr, len, PHASE_MSGOUT,
slp->sl_clear_atten) != 0)
{
nsp_error(sc, "MSGOUT: xfer short", isrc, ph, irqphs);
}
#endif /* !NSP_MSGOUT_SERIALIZE */
break;
case IRQPHS_MSGIN:
if (nsp_phase_match(sc, PHASE_MSGIN, ph) != 0)
return 1;
/*
* XXX: NSP QUIRK
* NSP invoke interrupts only in the case of scsi phase changes,
* therefore we should poll the scsi phase here to catch
* the next "msg in" if exists (no scsi phase changes).
*/
rv = len = 16;
do {
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
/* read a data */
regv = nsp_cr_read_1(bst, bsh, NSPR_DATA);
if (nsp_cr_read_1(bst, bsh, NSPR_PARITYR) & PARITYR_PE)
{
nsp_cr_write_1(bst, bsh,
NSPR_PARITYR,
PARITYR_ENABLE | PARITYR_CLEAR);
derror = SCSI_LOW_DATA_PE;
}
else
{
derror = 0;
}
/* assert ack */
cr = nsp_cr_read_1(bst, bsh, NSPR_SCBUSCR) | SCBUSCR_ACK;
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, cr);
if (scsi_low_msgin(slp, ti, regv | derror) == 0)
{
if (scsi_low_is_msgout_continue(ti, 0) != 0)
{
scsi_low_attention(slp);
}
}
/* check REQ nagated */
nsp_negate_signal(sc, SCBUSMON_REQ, "msgin<REQ>");
/* deassert ack */
cr = nsp_cr_read_1(bst, bsh, NSPR_SCBUSCR) & (~SCBUSCR_ACK);
nsp_cr_write_1(bst, bsh, NSPR_SCBUSCR, cr);
/* catch a next signal */
rv = nsp_expect_signal(sc, PHASE_MSGIN, SCBUSMON_REQ);
}
while (rv > 0 && len -- > 0);
break;
default:
slp->sl_error |= FATALIO;
nsp_error(sc, "unknown scsi phase", isrc, ph, irqphs);
break;
}
return 1;
#if 0
timerout:
nsp_start_timer(sc, NSP_TIMER_1MS);
return 0;
#endif
}
static int
nsp_timeout(sc)
struct nsp_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_int8_t ph, regv;
if (slp->sl_Tnexus == NULL)
return 0;
ph = nsp_cr_read_1(iot, ioh, NSPR_SCBUSMON);
switch (ph & SCBUSMON_PHMASK)
{
case PHASE_DATAOUT:
if (sc->sc_dataout_timeout == 0)
break;
/* check a fifo empty */
regv = bus_space_read_1(iot, ioh, nsp_fifosr);
if ((regv & FIFOSR_FULLEMP) == 0)
break;
bus_space_write_1(iot, ioh, nsp_irqcr, IRQCR_FIFOCL);
/* check still requested */
ph = nsp_cr_read_1(iot, ioh, NSPR_SCBUSMON);
if ((ph & SCBUSMON_REQ) == 0)
break;
/* check timeout */
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;
}
tout = NSP_DELAY_MAX;
while (tout -- > 0)
{
ph = nsp_cr_read_1(iot, ioh, NSPR_SCBUSMON);
if ((ph & SCBUSMON_PHMASK) != PHASE_DATAOUT)
break;
regv = bus_space_read_1(iot, ioh, nsp_fifosr);
if ((regv & FIFOSR_FULLEMP) == 0)
{
SCSI_LOW_DELAY(1);
continue;
}
bus_space_write_1(iot, ioh, nsp_irqcr, IRQCR_FIFOCL);
nsp_data_padding(sc, SCSI_LOW_WRITE, 32);
}
ph = nsp_cr_read_1(iot, ioh, NSPR_SCBUSMON);
if ((ph & SCBUSMON_PHMASK) == PHASE_DATAOUT)
sc->sc_dataout_timeout = SCSI_LOW_TIMEOUT_HZ;
break;
default:
break;
}
return 0;
}