/* $NetBSD: uha_eisa.c,v 1.39 2021/01/27 04:35:15 thorpej Exp $ */

/* $NetBSD: uha_eisa.c,v 1.39 2021/01/27 04:35:15 thorpej Exp $ */

/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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>
__KERNEL_RCSID(0, "$NetBSD: uha_eisa.c,v 1.39 2021/01/27 04:35:15 thorpej Exp $");

#include "opt_ddb.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/proc.h>

#include <sys/bus.h>
#include <sys/intr.h>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>

#include <dev/eisa/eisavar.h>
#include <dev/eisa/eisadevs.h>

#include <dev/ic/uhareg.h>
#include <dev/ic/uhavar.h>

#define UHA_EISA_SLOT_OFFSET 0xc80
#define UHA_EISA_IOSIZE 0x020

static int uha_eisa_match(device_t, cfdata_t, void *);
static void uha_eisa_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(uha_eisa, sizeof(struct uha_softc),
uha_eisa_match, uha_eisa_attach, NULL, NULL);

#ifndef DDB
#define Debugger() panic("should call debugger here (uha_eisa.c)")
#endif /* ! DDB */

static int u24_find(bus_space_tag_t, bus_space_handle_t,
struct uha_probe_data *);
static void u24_start_mbox(struct uha_softc *, struct uha_mscp *);
static int u24_poll(struct uha_softc *, struct scsipi_xfer *, int);
static int u24_intr(void *);
static void u24_init(struct uha_softc *);

static const struct device_compatible_entry compat_data[] = {
{ .compat = "USC024?", .data = EISA_PRODUCT_USC0240 },
DEVICE_COMPAT_EOL
};

/*
* Check the slots looking for a board we recognise
* If we find one, note its address (slot) and call
* the actual probe routine to check it out.
*/
static int
uha_eisa_match(device_t parent, cfdata_t match,
void *aux)
{
struct eisa_attach_args *ea = aux;
bus_space_tag_t iot = ea->ea_iot;
bus_space_handle_t ioh;
int rv;

if (!eisa_compatible_match(ea, compat_data))
return (0);

if (bus_space_map(iot, EISA_SLOT_ADDR(ea->ea_slot) +
UHA_EISA_SLOT_OFFSET, UHA_EISA_IOSIZE, 0, &ioh))
return (0);

rv = u24_find(iot, ioh, NULL);

bus_space_unmap(iot, ioh, UHA_EISA_IOSIZE);

return (rv);
}

/*
* Attach all the sub-devices we can find
*/
static void
uha_eisa_attach(device_t parent, device_t self, void *aux)
{
struct eisa_attach_args *ea = aux;
struct uha_softc *sc = device_private(self);
const struct device_compatible_entry *dce;
bus_space_tag_t iot = ea->ea_iot;
bus_dma_tag_t dmat = ea->ea_dmat;
bus_space_handle_t ioh;
struct uha_probe_data upd;
eisa_chipset_tag_t ec = ea->ea_ec;
eisa_intr_handle_t ih;
const char *intrstr;
char intrbuf[EISA_INTRSTR_LEN];

dce = eisa_compatible_lookup(ea, compat_data);
KASSERT(dce != NULL);

printf(": %s\n", (const char *)dce->data);

if (bus_space_map(iot, EISA_SLOT_ADDR(ea->ea_slot) +
UHA_EISA_SLOT_OFFSET, UHA_EISA_IOSIZE, 0, &ioh))
panic("uha_eisa_attach: could not map I/O addresses");

sc->sc_dev = self;
sc->sc_iot = iot;
sc->sc_ioh = ioh;
sc->sc_dmat = dmat;
if (!u24_find(iot, ioh, &upd))
panic("uha_eisa_attach: u24_find failed!");

sc->sc_dmaflags = 0;

if (eisa_intr_map(ec, upd.sc_irq, &ih)) {
aprint_error_dev(sc->sc_dev, "couldn't map interrupt (%d)\n",
upd.sc_irq);
return;
}
intrstr = eisa_intr_string(ec, ih, intrbuf, sizeof(intrbuf));
sc->sc_ih = eisa_intr_establish(ec, ih, IST_LEVEL, IPL_BIO,
u24_intr, sc);
if (sc->sc_ih == NULL) {
aprint_error_dev(sc->sc_dev, "couldn't establish interrupt");
if (intrstr != NULL)
aprint_error(" at %s", intrstr);
aprint_error("\n");
return;
}
aprint_normal_dev(sc->sc_dev, "interrupting at %s\n", intrstr);

/* Save function pointers for later use. */
sc->start_mbox = u24_start_mbox;
sc->poll = u24_poll;
sc->init = u24_init;

uha_attach(sc, &upd);
}

static int
u24_find(bus_space_tag_t iot, bus_space_handle_t ioh,
struct uha_probe_data *sc)
{
u_int8_t config0, config1, config2;
int irq, drq;
int resetcount = 4000; /* 4 secs? */

config0 = bus_space_read_1(iot, ioh, U24_CONFIG + 0);
config1 = bus_space_read_1(iot, ioh, U24_CONFIG + 1);
config2 = bus_space_read_1(iot, ioh, U24_CONFIG + 2);
if ((config0 & U24_MAGIC1) == 0 ||
(config1 & U24_MAGIC2) == 0)
return (0);

drq = -1;

switch (config0 & U24_IRQ_MASK) {
case U24_IRQ10:
irq = 10;
break;
case U24_IRQ11:
irq = 11;
break;
case U24_IRQ14:
irq = 14;
break;
case U24_IRQ15:
irq = 15;
break;
default:
printf("u24_find: illegal irq setting %x\n",
config0 & U24_IRQ_MASK);
return (0);
}

bus_space_write_1(iot, ioh, U24_LINT, UHA_ASRST);

while (--resetcount) {
if (bus_space_read_1(iot, ioh, U24_LINT))
break;
delay(1000); /* 1 mSec per loop */
}
if (!resetcount) {
printf("u24_find: board timed out during reset\n");
return (0);
}

/* if we want to fill in softc, do so now */
if (sc) {
sc->sc_irq = irq;
sc->sc_drq = drq;
sc->sc_scsi_dev = config2 & U24_HOSTID_MASK;
}

return (1);
}

static void
u24_start_mbox(struct uha_softc *sc, struct uha_mscp *mscp)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
int spincount = 100000; /* 1s should be enough */

while (--spincount) {
if ((bus_space_read_1(iot, ioh, U24_LINT) & U24_LDIP) == 0)
break;
delay(100);
}
if (!spincount) {
aprint_error_dev(sc->sc_dev,
"uha_start_mbox, board not responding\n");
Debugger();
}

bus_space_write_4(iot, ioh, U24_OGMPTR,
sc->sc_dmamap_mscp->dm_segs[0].ds_addr + UHA_MSCP_OFF(mscp));
if (mscp->flags & MSCP_ABORT)
bus_space_write_1(iot, ioh, U24_OGMCMD, 0x80);
else
bus_space_write_1(iot, ioh, U24_OGMCMD, 0x01);
bus_space_write_1(iot, ioh, U24_LINT, U24_OGMFULL);

if ((mscp->xs->xs_control & XS_CTL_POLL) == 0)
callout_reset(&mscp->xs->xs_callout,
mstohz(mscp->timeout), uha_timeout, mscp);
}

static int
u24_poll(struct uha_softc *sc, struct scsipi_xfer *xs, int count)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;

while (count) {
/*
* If we had interrupts enabled, would we
* have got an interrupt?
*/
if (bus_space_read_1(iot, ioh, U24_SINT) & U24_SDIP)
u24_intr(sc);
if (xs->xs_status & XS_STS_DONE)
return (0);
delay(1000);
count--;
}
return (1);
}

static int
u24_intr(void *arg)
{
struct uha_softc *sc = arg;
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
struct uha_mscp *mscp;
u_char uhastat;
u_long mboxval;

#ifdef UHADEBUG
printf("%s: uhaintr ", device_xname(sc->sc_dev));
#endif /*UHADEBUG */

if ((bus_space_read_1(iot, ioh, U24_SINT) & U24_SDIP) == 0)
return (0);

for (;;) {
/*
* First get all the information and then
* acknowledge the interrupt
*/
uhastat = bus_space_read_1(iot, ioh, U24_SINT);
mboxval = bus_space_read_4(iot, ioh, U24_ICMPTR);
bus_space_write_1(iot, ioh, U24_SINT, U24_ICM_ACK);
bus_space_write_1(iot, ioh, U24_ICMCMD, 0);

#ifdef UHADEBUG
printf("status = 0x%x ", uhastat);
#else
__USE(uhastat);
#endif /*UHADEBUG*/

/*
* Process the completed operation
*/
mscp = uha_mscp_phys_kv(sc, mboxval);
if (!mscp) {
printf("%s: BAD MSCP RETURNED!\n",
device_xname(sc->sc_dev));
continue; /* whatever it was, it'll timeout */
}
callout_stop(&mscp->xs->xs_callout);
uha_done(sc, mscp);

if ((bus_space_read_1(iot, ioh, U24_SINT) & U24_SDIP) == 0)
return (1);
}
}

static void
u24_init(struct uha_softc *sc)
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;

/* free OGM and ICM */
bus_space_write_1(iot, ioh, U24_OGMCMD, 0);
bus_space_write_1(iot, ioh, U24_ICMCMD, 0);
/* make sure interrupts are enabled */
#ifdef UHADEBUG
printf("u24_init: lmask=%02x, smask=%02x\n",
bus_space_read_1(iot, ioh, U24_LMASK),
bus_space_read_1(iot, ioh, U24_SMASK));
#endif
bus_space_write_1(iot, ioh, U24_LMASK, 0xd2); /* XXX */
bus_space_write_1(iot, ioh, U24_SMASK, 0x92); /* XXX */
}