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#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
#include "io.h"
/*
* MPC8xx real time clock
* optional board option switch
* optional nvram
* interrupt statistics
*/
enum{
Qdir,
Qrtc,
Qswitch,
Qnvram,
Qintstat,
Qporta,
Qportb,
Qportc,
/* sccr */
RTDIV= 1<<24,
RTSEL= 1<<23,
/* rtcsc */
RTE= 1<<0,
R38K= 1<<4,
};
static QLock rtclock; /* mutex on clock operations */
static Dirtab rtcdir[]={
".", {Qdir,0,QTDIR}, 0, 0555,
"rtc", {Qrtc, 0}, 12, 0664,
"switch", {Qswitch, 0}, 0, 0444,
"intstat", {Qintstat, 0}, 0, 0444,
"porta", {Qporta, 0}, 0, 0444,
"portb", {Qportb, 0}, 0, 0444,
"portc", {Qportc, 0}, 0, 0444,
"nvram", {Qnvram, 0}, 0, 0660,
};
static long nrtc = nelem(rtcdir)-1; /* excludes nvram */
static long readport(int, ulong, char*, long);
static void
rtcreset(void)
{
IMM *io;
int n;
io = m->iomem;
io->rtcsck = KEEP_ALIVE_KEY;
n = (RTClevel<<8)|RTE;
if(m->clockgen == 5*MHz)
n |= R38K;
io->rtcsc = n;
io->rtcsck = ~KEEP_ALIVE_KEY;
if(conf.nvramsize != 0){
rtcdir[nrtc].length = conf.nvramsize;
nrtc++;
}
}
static Chan*
rtcattach(char *spec)
{
return devattach('r', spec);
}
static Walkqid*
rtcwalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, rtcdir, nrtc, devgen);
}
static int
rtcstat(Chan *c, uchar *dp, int n)
{
return devstat(c, dp, n, rtcdir, nrtc, devgen);
}
static Chan*
rtcopen(Chan *c, int omode)
{
return devopen(c, omode, rtcdir, nrtc, devgen);
}
static void
rtcclose(Chan*)
{
}
static long
rtcread(Chan *c, void *buf, long n, vlong off)
{
ulong offset = off;
ulong t;
char *b;
if(c->qid.type & QTDIR)
return devdirread(c, buf, n, rtcdir, nrtc, devgen);
switch((ulong)c->qid.path){
case Qrtc:
t = m->iomem->rtc;
n = readnum(offset, buf, n, t, 12);
return n;
case Qswitch:
return readnum(offset, buf, n, archoptionsw(), 12);
case Qintstat:
b = malloc(2048);
if(waserror()){
free(b);
nexterror();
}
intrstats(b, 2048);
t = readstr(offset, buf, n, b);
poperror();
free(b);
return t;
case Qporta:
case Qportb:
case Qportc:
return readport(c->qid.path, offset, buf, n);
case Qnvram:
if(offset < 0 || offset >= conf.nvramsize)
return 0;
if(offset + n > conf.nvramsize)
n = conf.nvramsize - offset;
memmove(buf, (char*)conf.nvrambase+offset, n);
return n;
}
error(Egreg);
return 0; /* not reached */
}
static long
rtcwrite(Chan *c, void *buf, long n, vlong off)
{
ulong offset = off;
ulong secs;
char *cp, sbuf[32];
IMM *io;
switch((ulong)c->qid.path){
case Qrtc:
/*
* read the time
*/
if(offset != 0 || n >= sizeof(sbuf)-1)
error(Ebadarg);
memmove(sbuf, buf, n);
sbuf[n] = '\0';
cp = sbuf;
while(*cp){
if(*cp>='0' && *cp<='9')
break;
cp++;
}
secs = strtoul(cp, 0, 0);
/*
* set it
*/
io = ioplock();
io->rtck = KEEP_ALIVE_KEY;
io->rtc = secs;
io->rtck = ~KEEP_ALIVE_KEY;
iopunlock();
return n;
case Qnvram:
if(offset < 0 || offset >= conf.nvramsize)
return 0;
if(offset + n > conf.nvramsize)
n = conf.nvramsize - offset;
memmove((char*)conf.nvrambase+offset, buf, n);
return n;
}
error(Egreg);
return 0; /* not reached */
}
static long
readport(int p, ulong offset, char *buf, long n)
{
long t;
char *b;
int v[4], i;
IMM *io;
io = m->iomem;
for(i=0;i<nelem(v); i++)
v[i] = 0;
switch(p){
case Qporta:
v[0] = io->padat;
v[1] = io->padir;
v[2] = io->papar;
break;
case Qportb:
v[0] = io->pbdat;
v[1] = io->pbdir;
v[2] = io->pbpar;
break;
case Qportc:
v[0] = io->pcdat;
v[1] = io->pcdir;
v[2] = io->pcpar;
v[3] = io->pcso;
break;
}
b = malloc(READSTR);
if(waserror()){
free(b);
nexterror();
}
t = 0;
for(i=0; i<nelem(v); i++)
t += snprint(b+t, READSTR-t, " %8.8ux", v[i]);
t = readstr(offset, buf, n, b);
poperror();
free(b);
return t;
}
long
rtctime(void)
{
return m->iomem->rtc;
}
Dev rtcdevtab = {
'r',
"rtc",
rtcreset,
devinit,
devshutdown,
rtcattach,
rtcwalk,
rtcstat,
rtcopen,
devcreate,
rtcclose,
rtcread,
devbread,
rtcwrite,
devbwrite,
devremove,
devwstat,
};
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