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freebsd-dev/sys/dev/ct/ct.c
John Baldwin a92cf726f8 Lock the scsi_low code and the drivers which use it along with other 
related cleanups:
- Require each driver to initalize a mutex in the scsi_low_softc that
  is shared with the scsi_low code.  This mutex is used for CAM SIMs,
  timers, and interrupt handlers.
- Replace the osdep function switch with direct calls to the relevant
  CAM functions and direct manipulation of timers via callout(9).
- Collapse the CAM-specific scsi_low_osdep_interface substructure
  directly into scsi_low_softc.
- Use bus_*() instead of bus_space_*().
- Return BUS_PROBE_DEFAULT from probe routines instead of 0.
- No need to zero softcs.
- Pass 0ul and ~0ul instead of 0 and ~0 to bus_alloc_resource().
- Spell "dettach" as "detach".
- Remove unused 'dvname' variables.
- De-spl().

Tested by:	no one
2014-11-20 20:50:05 +00:00

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/* $NecBSD: ct.c,v 1.13.12.5 2001/06/26 07:31:53 honda Exp $ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/* $NetBSD$ */
#define CT_DEBUG
#define CT_IO_CONTROL_FLAGS (CT_USE_CCSEQ | CT_FAST_INTR)
/*-
* [NetBSD for NEC PC-98 series]
* Copyright (c) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
* NetBSD/pc98 porting staff. All rights reserved.
*
* Copyright (c) 1994, 1995, 1996, 1997, 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/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/queue.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <cam/scsi/scsi_low.h>
#include <dev/ic/wd33c93reg.h>
#include <dev/ct/ctvar.h>
#include <dev/ct/ct_machdep.h>
#define CT_NTARGETS 8
#define CT_NLUNS 8
#define CT_RESET_DEFAULT 2000
#define CT_DELAY_MAX (2 * 1000 * 1000)
#define CT_DELAY_INTERVAL (1)
/***************************************************
* DEBUG
***************************************************/
#ifdef CT_DEBUG
int ct_debug;
#endif /* CT_DEBUG */
/***************************************************
* IO control
***************************************************/
#define CT_USE_CCSEQ 0x0100
#define CT_FAST_INTR 0x0200
u_int ct_io_control = CT_IO_CONTROL_FLAGS;
/***************************************************
* 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 ,
};
#if 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_FSCSI[] = {
{25, 0xa0}, {37, 0xb0}, {50, 0x20}, {62, 0xd0}, {75, 0x30},
{87, 0xf0}, {100, 0x40}, {125, 0x50}, {0, 0}
};
static struct ct_synch_data ct_synch_data_SCSI[] = {
{50, 0x20}, {75, 0x30}, {100, 0x40}, {125, 0x50}, {0, 0}
};
#endif
/***************************************************
* DEVICE STRUCTURE
***************************************************/
extern struct cfdriver ct_cd;
/*****************************************************************
* Interface functions
*****************************************************************/
static int ct_xfer(struct ct_softc *, u_int8_t *, int, int, u_int *);
static void ct_io_xfer(struct ct_softc *);
static int ct_reselected(struct ct_softc *, u_int8_t);
static void ct_phase_error(struct ct_softc *, u_int8_t);
static int ct_start_selection(struct ct_softc *, struct slccb *);
static int ct_msg(struct ct_softc *, struct targ_info *, u_int);
static int ct_world_start(struct ct_softc *, int);
static __inline void cthw_phase_bypass(struct ct_softc *, u_int8_t);
static int cthw_chip_reset(struct ct_bus_access_handle *, int *, int, int);
static void cthw_bus_reset(struct ct_softc *);
static int ct_ccb_nexus_establish(struct ct_softc *);
static int ct_lun_nexus_establish(struct ct_softc *);
static int ct_target_nexus_establish(struct ct_softc *, int, int);
static void cthw_attention(struct ct_softc *);
static int ct_targ_init(struct ct_softc *, struct targ_info *, int);
static int ct_unbusy(struct ct_softc *);
static void ct_attention(struct ct_softc *);
static struct ct_synch_data *ct_make_synch_table(struct ct_softc *);
static int ct_catch_intr(struct ct_softc *);
static int ct_poll(void *);
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_LUN_INIT_T NULL,
SC_LOW_SELECT_T ct_start_selection,
SC_LOW_NEXUS_T ct_lun_nexus_establish,
SC_LOW_NEXUS_T ct_ccb_nexus_establish,
SC_LOW_ATTEN_T cthw_attention,
SC_LOW_MSG_T ct_msg,
SC_LOW_TIMEOUT_T NULL,
SC_LOW_POLL_T ct_poll,
NULL, /* SC_LOW_POWER_T cthw_power, */
};
/**************************************************
* HW functions
**************************************************/
static __inline void
cthw_phase_bypass(struct ct_softc *ct, u_int8_t ph)
{
struct ct_bus_access_handle *chp = &ct->sc_ch;
ct_cr_write_1(chp, wd3s_cph, ph);
ct_cr_write_1(chp, wd3s_cmd, WD3S_SELECT_ATN_TFR);
}
static void
cthw_bus_reset(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(struct ct_bus_access_handle *chp, int *chiprevp, int chipclk,
int hostid)
{
#define CT_SELTIMEOUT_20MHz_REGV (0x80)
u_int8_t aux, regv;
u_int seltout;
int wc;
/* issue abort cmd */
ct_cr_write_1(chp, wd3s_cmd, WD3S_ABORT);
DELAY(1000); /* 1ms wait */
(void) ct_stat_read_1(chp);
(void) ct_cr_read_1(chp, wd3s_stat);
/* setup chip registers */
regv = 0;
seltout = CT_SELTIMEOUT_20MHz_REGV;
switch (chipclk)
{
case 8:
case 10:
seltout = (seltout * chipclk) / 20;
regv = IDR_FS_8_10;
break;
case 12:
case 15:
seltout = (seltout * chipclk) / 20;
regv = IDR_FS_12_15;
break;
case 16:
case 20:
seltout = (seltout * chipclk) / 20;
regv = IDR_FS_16_20;
break;
default:
panic("ct: illegal chip clk rate");
break;
}
regv |= IDR_EHP | hostid | IDR_RAF | IDR_EAF;
ct_cr_write_1(chp, wd3s_oid, regv);
ct_cr_write_1(chp, wd3s_cmd, WD3S_RESET);
for (wc = CT_RESET_DEFAULT; wc > 0; wc --)
{
aux = ct_stat_read_1(chp);
if (aux != 0xff && (aux & STR_INT))
{
regv = ct_cr_read_1(chp, wd3s_stat);
if (regv == BSR_RESET || regv == BSR_AFM_RESET)
break;
ct_cr_write_1(chp, wd3s_cmd, WD3S_RESET);
}
DELAY(1);
}
if (wc == 0)
return ENXIO;
ct_cr_write_1(chp, wd3s_tout, seltout);
ct_cr_write_1(chp, wd3s_sid, SIDR_RESEL);
ct_cr_write_1(chp, wd3s_ctrl, CR_DEFAULT);
ct_cr_write_1(chp, wd3s_synch, 0);
if (chiprevp != NULL)
{
*chiprevp = CT_WD33C93;
if (regv == BSR_RESET)
goto out;
*chiprevp = CT_WD33C93_A;
ct_cr_write_1(chp, wd3s_qtag, 0xaa);
if (ct_cr_read_1(chp, wd3s_qtag) != 0xaa)
{
ct_cr_write_1(chp, wd3s_qtag, 0x0);
goto out;
}
ct_cr_write_1(chp, wd3s_qtag, 0x55);
if (ct_cr_read_1(chp, wd3s_qtag) != 0x55)
{
ct_cr_write_1(chp, wd3s_qtag, 0x0);
goto out;
}
ct_cr_write_1(chp, wd3s_qtag, 0x0);
*chiprevp = CT_WD33C93_B;
}
out:
(void) ct_stat_read_1(chp);
(void) ct_cr_read_1(chp, wd3s_stat);
return 0;
}
static struct ct_synch_data *
ct_make_synch_table(struct ct_softc *ct)
{
struct ct_synch_data *sdtp, *sdp;
u_int base, i, period;
sdtp = sdp = &ct->sc_default_sdt[0];
if ((ct->sc_chipclk % 5) == 0)
base = 1000 / (5 * 2); /* 5 MHz type */
else
base = 1000 / (4 * 2); /* 4 MHz type */
if (ct->sc_chiprev >= CT_WD33C93_B)
{
/* fast scsi */
for (i = 2; i < 8; i ++, sdp ++)
{
period = (base * i) / 2;
if (period >= 200) /* 5 MHz */
break;
sdp->cs_period = period / 4;
sdp->cs_syncr = (i * 0x10) | 0x80;
}
}
for (i = 2; i < 8; i ++, sdp ++)
{
period = (base * i);
if (period > 500) /* 2 MHz */
break;
sdp->cs_period = period / 4;
sdp->cs_syncr = (i * 0x10);
}
sdp->cs_period = 0;
sdp->cs_syncr = 0;
return sdtp;
}
/**************************************************
* Attach & Probe
**************************************************/
int
ctprobesubr(struct ct_bus_access_handle *chp, u_int dvcfg, int hsid,
u_int chipclk, int *chiprevp)
{
#if 0
if ((ct_stat_read_1(chp) & STR_BSY) != 0)
return 0;
#endif
if (cthw_chip_reset(chp, chiprevp, chipclk, hsid) != 0)
return 0;
return 1;
}
void
ctattachsubr(struct ct_softc *ct)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
ct->sc_tmaxcnt = SCSI_LOW_MIN_TOUT * 1000 * 1000; /* default */
slp->sl_funcs = &ct_funcs;
slp->sl_flags |= HW_READ_PADDING;
(void) scsi_low_attach(slp, 0, CT_NTARGETS, CT_NLUNS,
sizeof(struct ct_targ_info), 0);
}
/**************************************************
* SCSI LOW interface functions
**************************************************/
static void
cthw_attention(struct ct_softc *ct)
{
struct ct_bus_access_handle *chp = &ct->sc_ch;
ct->sc_atten = 1;
if ((ct_stat_read_1(chp) & (STR_BSY | STR_CIP)) != 0)
return;
ct_cr_write_1(chp, wd3s_cmd, WD3S_ASSERT_ATN);
DELAY(10);
if ((ct_stat_read_1(chp) & STR_LCI) == 0)
ct->sc_atten = 0;
ct_unbusy(ct);
return;
}
static void
ct_attention(struct ct_softc *ct)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
if (slp->sl_atten == 0)
{
ct_unbusy(ct);
scsi_low_attention(slp);
}
else if (ct->sc_atten != 0)
{
ct_unbusy(ct);
cthw_attention(ct);
}
}
static int
ct_targ_init(struct ct_softc *ct, struct targ_info *ti, int action)
{
struct ct_targ_info *cti = (void *) ti;
if (action == SCSI_LOW_INFO_ALLOC || action == SCSI_LOW_INFO_REVOKE)
{
if (ct->sc_sdp == NULL)
{
ct->sc_sdp = ct_make_synch_table(ct);
}
switch (ct->sc_chiprev)
{
default:
ti->ti_maxsynch.offset = 5;
break;
case CT_WD33C93_A:
case CT_AM33C93_A:
ti->ti_maxsynch.offset = 12;
break;
case CT_WD33C93_B:
case CT_WD33C93_C:
ti->ti_maxsynch.offset = 12;
break;
}
ti->ti_maxsynch.period = ct->sc_sdp[0].cs_period;
ti->ti_width = SCSI_LOW_BUS_WIDTH_8;
cti->cti_syncreg = 0;
}
return 0;
}
static int
ct_world_start(struct ct_softc *ct, int fdone)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct ct_bus_access_handle *chp = &ct->sc_ch;
if (ct->sc_sdp == NULL)
{
ct->sc_sdp = ct_make_synch_table(ct);
}
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;
cthw_chip_reset(chp, NULL, ct->sc_chipclk, slp->sl_hostid);
scsi_low_bus_reset(slp);
cthw_chip_reset(chp, NULL, ct->sc_chipclk, slp->sl_hostid);
return 0;
}
static int
ct_start_selection(struct ct_softc *ct, struct slccb *cb)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct ct_bus_access_handle *chp = &ct->sc_ch;
struct targ_info *ti = slp->sl_Tnexus;
struct lun_info *li = slp->sl_Lnexus;
int s, satok;
u_int8_t cmd;
ct->sc_tmaxcnt = cb->ccb_tcmax * 1000 * 1000;
ct->sc_atten = 0;
satok = 0;
if (scsi_low_is_disconnect_ok(cb) != 0)
{
if (ct->sc_chiprev >= CT_WD33C93_A)
satok = 1;
else if (cthw_cmdlevel[slp->sl_scp.scp_cmd[0]] != 0)
satok = 1;
}
if (satok != 0 &&
scsi_low_is_msgout_continue(ti, SCSI_LOW_MSG_IDENTIFY) == 0)
{
cmd = WD3S_SELECT_ATN_TFR;
ct->sc_satgo = CT_SAT_GOING;
}
else
{
cmd = WD3S_SELECT_ATN;
ct->sc_satgo = 0;
}
if ((ct_stat_read_1(chp) & (STR_BSY | STR_INT | STR_CIP)) != 0)
return SCSI_LOW_START_FAIL;
if ((ct->sc_satgo & CT_SAT_GOING) != 0)
{
(void) scsi_low_msgout(slp, ti, SCSI_LOW_MSGOUT_INIT);
scsi_low_cmd(slp, ti);
ct_cr_write_1(chp, wd3s_oid, slp->sl_scp.scp_cmdlen);
ct_write_cmds(chp, slp->sl_scp.scp_cmd, slp->sl_scp.scp_cmdlen);
}
else
{
/* anyway attention assert */
SCSI_LOW_ASSERT_ATN(slp);
}
ct_target_nexus_establish(ct, li->li_lun, slp->sl_scp.scp_direction);
s = splhigh();
if ((ct_stat_read_1(chp) & (STR_BSY | STR_INT | STR_CIP)) == 0)
{
/* XXX:
* Reload a lun again here.
*/
ct_cr_write_1(chp, wd3s_lun, li->li_lun);
ct_cr_write_1(chp, wd3s_cmd, cmd);
if ((ct_stat_read_1(chp) & 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(struct ct_softc *ct, struct targ_info *ti, u_int msg)
{
struct ct_bus_access_handle *chp = &ct->sc_ch;
struct ct_targ_info *cti = (void *) ti;
struct ct_synch_data *csp = ct->sc_sdp;
u_int offset, period;
int 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;
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;
error = EINVAL;
}
else
{
cti->cti_syncreg = ((offset & 0x0f) | csp->cs_syncr);
error = 0;
}
if (ct->ct_synch_setup != 0)
(*ct->ct_synch_setup) (ct, ti);
ct_cr_write_1(chp, wd3s_synch, cti->cti_syncreg);
return error;
}
/*************************************************
* <DATA PHASE>
*************************************************/
static int
ct_xfer(struct ct_softc *ct, u_int8_t *data, int len, int direction,
u_int *statp)
{
struct ct_bus_access_handle *chp = &ct->sc_ch;
int wc;
register u_int8_t aux;
*statp = 0;
if (len == 1)
{
ct_cr_write_1(chp, wd3s_cmd, WD3S_SBT | WD3S_TFR_INFO);
}
else
{
cthw_set_count(chp, len);
ct_cr_write_1(chp, wd3s_cmd, WD3S_TFR_INFO);
}
aux = ct_stat_read_1(chp);
if ((aux & STR_LCI) != 0)
{
cthw_set_count(chp, 0);
return len;
}
for (wc = 0; wc < ct->sc_tmaxcnt; wc ++)
{
/* check data ready */
if ((aux & (STR_BSY | STR_DBR)) == (STR_BSY | STR_DBR))
{
if (direction == SCSI_LOW_READ)
{
*data = ct_cr_read_1(chp, wd3s_data);
if ((aux & STR_PE) != 0)
*statp |= SCSI_LOW_DATA_PE;
}
else
{
ct_cr_write_1(chp, wd3s_data, *data);
}
len --;
if (len <= 0)
break;
data ++;
}
else
{
DELAY(1);
}
/* check phase miss */
aux = ct_stat_read_1(chp);
if ((aux & STR_INT) != 0)
break;
}
return len;
}
#define CT_PADDING_BUF_SIZE 32
static void
ct_io_xfer(struct ct_softc *ct)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct ct_bus_access_handle *chp = &ct->sc_ch;
struct sc_p *sp = &slp->sl_scp;
u_int stat;
int len;
u_int8_t pbuf[CT_PADDING_BUF_SIZE];
/* polling mode */
ct_cr_write_1(chp, wd3s_ctrl, ct->sc_creg);
if (sp->scp_datalen <= 0)
{
slp->sl_error |= PDMAERR;
if (slp->sl_scp.scp_direction == SCSI_LOW_WRITE)
bzero(pbuf, CT_PADDING_BUF_SIZE);
ct_xfer(ct, pbuf, CT_PADDING_BUF_SIZE,
sp->scp_direction, &stat);
}
else
{
len = ct_xfer(ct, sp->scp_data, sp->scp_datalen,
sp->scp_direction, &stat);
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(struct ct_softc *ct, u_int8_t scsi_status)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct targ_info *ti = slp->sl_Tnexus;
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_Tnexus, msg, 1);
if (pep->pe_msg != NULL)
{
device_printf(slp->sl_dev, "phase error: %s",
pep->pe_msg);
scsi_low_print(slp, slp->sl_Tnexus);
}
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 int
ct_reselected(struct ct_softc *ct, u_int8_t scsi_status)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct ct_bus_access_handle *chp = &ct->sc_ch;
struct targ_info *ti;
u_int sid;
u_int8_t regv;
ct->sc_atten = 0;
ct->sc_satgo &= ~CT_SAT_GOING;
regv = ct_cr_read_1(chp, wd3s_sid);
if ((regv & SIDR_VALID) == 0)
return EJUSTRETURN;
sid = regv & SIDR_IDM;
if ((ti = scsi_low_reselected(slp, sid)) == NULL)
return EJUSTRETURN;
ct_target_nexus_establish(ct, 0, SCSI_LOW_READ);
if (scsi_status != BSR_AFM_RESEL)
return EJUSTRETURN;
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
regv = ct_cr_read_1(chp, wd3s_data);
if (scsi_low_msgin(slp, ti, (u_int) regv) == 0)
{
if (scsi_low_is_msgout_continue(ti, 0) != 0)
{
/* XXX: scsi_low_attetion */
scsi_low_attention(slp);
}
}
if (ct->sc_atten != 0)
{
ct_attention(ct);
}
ct_cr_write_1(chp, wd3s_cmd, WD3S_NEGATE_ACK);
return EJUSTRETURN;
}
static int
ct_target_nexus_establish(struct ct_softc *ct, int lun, int dir)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct ct_bus_access_handle *chp = &ct->sc_ch;
struct targ_info *ti = slp->sl_Tnexus;
struct ct_targ_info *cti = (void *) ti;
if (dir == SCSI_LOW_WRITE)
ct_cr_write_1(chp, wd3s_did, ti->ti_id);
else
ct_cr_write_1(chp, wd3s_did, ti->ti_id | DIDR_DPD);
ct_cr_write_1(chp, wd3s_lun, lun);
ct_cr_write_1(chp, wd3s_ctrl, ct->sc_creg | CR_DMA);
ct_cr_write_1(chp, wd3s_cph, 0);
ct_cr_write_1(chp, wd3s_synch, cti->cti_syncreg);
cthw_set_count(chp, 0);
return 0;
}
static int
ct_lun_nexus_establish(struct ct_softc *ct)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct ct_bus_access_handle *chp = &ct->sc_ch;
struct lun_info *li = slp->sl_Lnexus;
ct_cr_write_1(chp, wd3s_lun, li->li_lun);
return 0;
}
static int
ct_ccb_nexus_establish(struct ct_softc *ct)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct ct_bus_access_handle *chp = &ct->sc_ch;
struct lun_info *li = slp->sl_Lnexus;
struct targ_info *ti = slp->sl_Tnexus;
struct ct_targ_info *cti = (void *) ti;
struct slccb *cb = slp->sl_Qnexus;
ct->sc_tmaxcnt = cb->ccb_tcmax * 1000 * 1000;
if ((ct->sc_satgo & CT_SAT_GOING) != 0)
{
ct_cr_write_1(chp, wd3s_oid, slp->sl_scp.scp_cmdlen);
ct_write_cmds(chp, slp->sl_scp.scp_cmd, slp->sl_scp.scp_cmdlen);
}
if (slp->sl_scp.scp_direction == SCSI_LOW_WRITE)
ct_cr_write_1(chp, wd3s_did, ti->ti_id);
else
ct_cr_write_1(chp, wd3s_did, ti->ti_id | DIDR_DPD);
ct_cr_write_1(chp, wd3s_lun, li->li_lun);
ct_cr_write_1(chp, wd3s_synch, cti->cti_syncreg);
return 0;
}
static int
ct_unbusy(struct ct_softc *ct)
{
struct scsi_low_softc *slp = &ct->sc_sclow;
struct ct_bus_access_handle *chp = &ct->sc_ch;
int wc;
register u_int8_t regv;
for (wc = 0; wc < CT_DELAY_MAX / CT_DELAY_INTERVAL; wc ++)
{
regv = ct_stat_read_1(chp);
if ((regv & (STR_BSY | STR_CIP)) == 0)
return 0;
if (regv == (u_int8_t) -1)
return EIO;
DELAY(CT_DELAY_INTERVAL);
}
device_printf(slp->sl_dev, "unbusy timeout\n");
return EBUSY;
}
static int
ct_catch_intr(struct ct_softc *ct)
{
struct ct_bus_access_handle *chp = &ct->sc_ch;
int wc;
register u_int8_t regv;
for (wc = 0; wc < CT_DELAY_MAX / CT_DELAY_INTERVAL; wc ++)
{
regv = ct_stat_read_1(chp);
if ((regv & (STR_INT | STR_BSY | STR_CIP)) == STR_INT)
return 0;
DELAY(CT_DELAY_INTERVAL);
}
return EJUSTRETURN;
}
void
ctintr(void *arg)
{
struct ct_softc *ct = arg;
struct scsi_low_softc *slp = &ct->sc_sclow;
SCSI_LOW_LOCK(slp);
ct_poll(ct);
SCSI_LOW_UNLOCK(slp);
}
static int
ct_poll(void *arg)
{
struct ct_softc *ct = arg;
struct scsi_low_softc *slp = &ct->sc_sclow;
struct ct_bus_access_handle *chp = &ct->sc_ch;
struct targ_info *ti;
struct buf *bp;
u_int derror, flags;
int len, satgo, error;
u_int8_t scsi_status, regv;
again:
if (slp->sl_flags & HW_INACTIVE)
return 0;
/**************************************************
* Get status & bus phase
**************************************************/
if ((ct_stat_read_1(chp) & STR_INT) == 0)
return 0;
scsi_status = ct_cr_read_1(chp, wd3s_stat);
if (scsi_status == ((u_int8_t) -1))
return 1;
/**************************************************
* Check reselection, or nexus
**************************************************/
if (scsi_status == BSR_RESEL || scsi_status == BSR_AFM_RESEL)
{
if (ct_reselected(ct, scsi_status) == EJUSTRETURN)
return 1;
}
if ((ti = slp->sl_Tnexus) == NULL)
return 1;
/**************************************************
* Debug section
**************************************************/
#ifdef CT_DEBUG
if (ct_debug > 0)
{
scsi_low_print(slp, NULL);
device_printf(slp->sl_dev, "scsi_status 0x%x\n\n",
(u_int) scsi_status);
#ifdef KDB
if (ct_debug > 1)
kdb_enter(KDB_WHY_CAM, "ct");
#endif /* KDB */
}
#endif /* CT_DEBUG */
/**************************************************
* Internal scsi phase
**************************************************/
satgo = ct->sc_satgo;
ct->sc_satgo &= ~CT_SAT_GOING;
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);
SCSI_LOW_SETUP_PHASE(ti, PH_SELECTED);
return 1;
}
else
{
scsi_low_arbit_win(slp);
SCSI_LOW_SETUP_PHASE(ti, PH_MSGOUT); /* XXX */
}
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 if (ct->sc_dma & CT_DMA_PIOSTART)
{
(*ct->ct_pio_xfer_stop) (ct);
ct->sc_dma &= ~CT_DMA_PIOSTART;
}
else
{
scsi_low_data_finish(slp);
}
}
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)
{
ct_attention(ct);
}
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)
{
ct_attention(ct);
}
common_data_phase:
if (slp->sl_scp.scp_datalen > 0)
{
slp->sl_flags |= HW_PDMASTART;
if ((ct->sc_xmode & CT_XMODE_PIO) != 0)
{
error = (*ct->ct_pio_xfer_start) (ct);
if (error == 0)
{
ct->sc_dma |= CT_DMA_PIOSTART;
return 1;
}
}
if ((ct->sc_xmode & CT_XMODE_DMA) != 0)
{
error = (*ct->ct_dma_xfer_start) (ct);
if (error == 0)
{
ct->sc_dma |= CT_DMA_DMASTART;
return 1;
}
}
}
else
{
if (slp->sl_scp.scp_direction == SCSI_LOW_READ)
{
if (!(slp->sl_flags & HW_READ_PADDING))
{
device_printf(slp->sl_dev,
"read padding required\n");
return 1;
}
}
else
{
if (!(slp->sl_flags & HW_WRITE_PADDING))
{
device_printf(slp->sl_dev,
"write padding required\n");
return 1;
}
}
slp->sl_flags |= HW_PDMASTART;
}
ct_io_xfer(ct);
return 1;
case BSR_CMDOUT:
SCSI_LOW_SETUP_PHASE(ti, PH_CMD);
if (scsi_low_cmd(slp, ti) != 0)
{
ct_attention(ct);
}
if (ct_xfer(ct, slp->sl_scp.scp_cmd,
slp->sl_scp.scp_cmdlen,
SCSI_LOW_WRITE, &derror) != 0)
{
device_printf(slp->sl_dev,
"scsi cmd xfer short\n");
}
return 1;
case BSR_STATIN:
SCSI_LOW_SETUP_PHASE(ti, PH_STAT);
if ((ct_io_control & CT_USE_CCSEQ) != 0)
{
if (scsi_low_is_msgout_continue(ti, 0) != 0 ||
ct->sc_atten != 0)
{
ct_xfer(ct, &regv, 1, SCSI_LOW_READ,
&derror);
scsi_low_statusin(slp, ti,
regv | derror);
}
else
{
ct->sc_satgo |= CT_SAT_GOING;
cthw_set_count(chp, 0);
cthw_phase_bypass(ct, 0x41);
}
}
else
{
ct_xfer(ct, &regv, 1, SCSI_LOW_READ, &derror);
scsi_low_statusin(slp, ti, regv | derror);
}
return 1;
case BSR_UNSPINFO0:
case BSR_UNSPINFO1:
device_printf(slp->sl_dev, "illegal bus phase (0x%x)\n",
(u_int) scsi_status);
scsi_low_print(slp, ti);
return 1;
case BSR_MSGOUT:
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)
{
ct_attention(ct);
}
if (ct_xfer(ct, ti->ti_msgoutstr, len,
SCSI_LOW_WRITE, &derror) != 0)
{
device_printf(slp->sl_dev,
"scsi msgout xfer short\n");
}
SCSI_LOW_DEASSERT_ATN(slp);
ct->sc_atten = 0;
return 1;
case BSR_MSGIN:/* msg in */
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
ct_xfer(ct, &regv, 1, SCSI_LOW_READ, &derror);
if (scsi_low_msgin(slp, ti, regv | derror) == 0)
{
if (scsi_low_is_msgout_continue(ti, 0) != 0)
{
/* XXX: scsi_low_attetion */
scsi_low_attention(slp);
}
}
if ((ct_io_control & CT_FAST_INTR) != 0)
{
if (ct_catch_intr(ct) == 0)
goto again;
}
return 1;
}
}
else
{
/**************************************************
* Special SCSI phase
**************************************************/
switch (scsi_status)
{
case BSR_SATSDP: /* SAT with save data pointer */
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
ct->sc_satgo |= CT_SAT_GOING;
scsi_low_msgin(slp, ti, MSG_SAVESP);
cthw_phase_bypass(ct, 0x41);
return 1;
case BSR_SATFIN: /* SAT COMPLETE */
/*
* emulate statusin => msgin
*/
SCSI_LOW_SETUP_PHASE(ti, PH_STAT);
scsi_low_statusin(slp, ti, ct_cr_read_1(chp, wd3s_lun));
SCSI_LOW_SETUP_PHASE(ti, PH_MSGIN);
scsi_low_msgin(slp, ti, MSG_COMP);
scsi_low_disconnected(slp, ti);
return 1;
case BSR_ACKREQ: /* negate ACK */
if (ct->sc_atten != 0)
{
ct_attention(ct);
}
ct_cr_write_1(chp, wd3s_cmd, WD3S_NEGATE_ACK);
if ((ct_io_control & CT_FAST_INTR) != 0)
{
/* XXX:
* Should clear a pending interrupt and
* sync with a next interrupt!
*/
ct_catch_intr(ct);
}
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_msgin(slp, ti, MSG_DISCON);
}
scsi_low_disconnected(slp, ti);
return 1;
default:
break;
}
}
ct_phase_error(ct, scsi_status);
return 1;
}
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