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/* $OpenBSD: pcc.c,v 1.17 2009/03/01 22:07:12 miod Exp $ */
/*
* Copyright (c) 1995 Theo de Raadt
* 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.
*
* 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.
*/
/*
* VME147 peripheral channel controller
*/
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/tty.h>
#include <sys/uio.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/fcntl.h>
#include <sys/device.h>
#include <machine/cpu.h>
#include <machine/autoconf.h>
#include <dev/cons.h>
#include <mvme68k/dev/pccreg.h>
struct pccsoftc {
struct device sc_dev;
vaddr_t sc_vaddr;
paddr_t sc_paddr;
struct pccreg *sc_pcc;
struct intrhand sc_nmiih;
};
void pccattach(struct device *, struct device *, void *);
int pccmatch(struct device *, void *, void *);
int pccabort(void *);
int pcc_print(void *, const char *);
int pcc_scan(struct device *, void *, void *);
struct cfattach pcc_ca = {
sizeof(struct pccsoftc), pccmatch, pccattach
};
struct cfdriver pcc_cd = {
NULL, "pcc", DV_DULL
};
struct pccreg *sys_pcc = NULL;
int
pccmatch(parent, vcf, args)
struct device *parent;
void *vcf, *args;
{
struct confargs *ca = args;
/* the pcc only exist on vme147's */
if (cputyp != CPU_147)
return (0);
return (!badvaddr(IIOV(ca->ca_paddr) + PCCSPACE_PCCCHIP_OFF, 1));
}
int
pcc_print(args, bus)
void *args;
const char *bus;
{
struct confargs *ca = args;
if (ca->ca_offset != -1)
printf(" offset 0x%x", ca->ca_offset);
if (ca->ca_ipl > 0)
printf(" ipl %d", ca->ca_ipl);
return (UNCONF);
}
int
pcc_scan(parent, child, args)
struct device *parent;
void *child, *args;
{
struct cfdata *cf = child;
struct pccsoftc *sc = (struct pccsoftc *)parent;
struct confargs *ca = args;
struct confargs oca;
bzero(&oca, sizeof oca);
oca.ca_iot = ca->ca_iot;
oca.ca_dmat = ca->ca_dmat;
oca.ca_offset = cf->cf_loc[0];
oca.ca_ipl = cf->cf_loc[1];
if (oca.ca_offset != -1) {
oca.ca_vaddr = sc->sc_vaddr + oca.ca_offset;
oca.ca_paddr = sc->sc_paddr + oca.ca_offset;
} else {
oca.ca_vaddr = (vaddr_t)-1;
oca.ca_paddr = (paddr_t)-1;
}
oca.ca_bustype = BUS_PCC;
oca.ca_name = cf->cf_driver->cd_name;
if ((*cf->cf_attach->ca_match)(parent, cf, &oca) == 0)
return (0);
config_attach(parent, cf, &oca, pcc_print);
return (1);
}
void
pccattach(parent, self, args)
struct device *parent, *self;
void *args;
{
struct confargs *ca = args;
struct pccsoftc *sc = (struct pccsoftc *)self;
if (sys_pcc)
panic("pcc already attached!");
/*
* since we know ourself to land in intiobase land,
* we must adjust our address
*/
sc->sc_paddr = ca->ca_paddr;
sc->sc_vaddr = IIOV(sc->sc_paddr);
sc->sc_pcc = (struct pccreg *)(sc->sc_vaddr + PCCSPACE_PCCCHIP_OFF);
sys_pcc = sc->sc_pcc;
printf(": rev %d\n", sc->sc_pcc->pcc_chiprev);
sc->sc_nmiih.ih_fn = pccabort;
sc->sc_nmiih.ih_ipl = 7;
sc->sc_nmiih.ih_wantframe = 1;
pccintr_establish(PCCV_ABORT, &sc->sc_nmiih, self->dv_xname);
sc->sc_pcc->pcc_vecbase = PCC_VECBASE;
sc->sc_pcc->pcc_abortirq = PCC_ABORT_IEN | PCC_ABORT_ACK;
sc->sc_pcc->pcc_genctl |= PCC_GENCTL_IEN;
/* XXX further init of PCC chip? */
config_search(pcc_scan, self, args);
}
/*
* PCC interrupts land in a PCC_NVEC sized hole starting at PCC_VECBASE
*/
int
pccintr_establish(vec, ih, name)
int vec;
struct intrhand *ih;
const char *name;
{
#ifdef DIAGNOSTIC
if (vec < 0 || vec >= PCC_NVEC)
panic("pccintr_establish: illegal vector for %s: 0x%x",
name, vec);
#endif
return intr_establish(PCC_VECBASE + vec, ih, name);
}
int
pccabort(frame)
void *frame;
{
#if 0
/* XXX wait for it to debounce -- there is something wrong here */
while (sys_pcc->pcc_abortirq & PCC_ABORT_ABS)
;
delay(2);
#endif
sys_pcc->pcc_abortirq = PCC_ABORT_IEN | PCC_ABORT_ACK;
nmihand(frame);
return (1);
}
int
pccspeed(pcc)
struct pccreg *pcc;
{
volatile u_short lim = pcc_timer_us2lim(400);
volatile u_short tmp;
volatile int cnt;
int speed;
pcc->pcc_t1irq = 0; /* just in case */
pcc->pcc_t1pload = 0;
pcc->pcc_t1ctl = PCC_TIMERCLEAR;
pcc->pcc_t1ctl = PCC_TIMERSTART;
cnt = 0;
for (;;) {
tmp = pcc->pcc_t1count;
if (tmp > lim)
break;
tmp = lim;
cnt++;
}
pcc->pcc_t1ctl = PCC_TIMERCLEAR;
printf("pccspeed cnt=%d\n", cnt);
/*
* Empirically determined. Unfortunately, because of various
* memory board effects and such, it is rather unlikely that
* we will find a nice formula.
*/
if (cnt > 280000)
speed = 50;
else if (cnt > 210000)
speed = 33;
else if (cnt > 190000)
speed = 25;
else if (cnt > 170000) /* 171163, 170335 */
speed = 20;
else
speed = 16;
return (speed);
}
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