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#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
/* Centronix parallel (printer) port */
/* base addresses */
static int lptbase[] = {
0x378, /* lpt1 */
0x3bc, /* lpt2 */
0x278 /* lpt3 (sic) */
};
#define NDEV nelem(lptbase)
static int lptallocd[NDEV];
/* offsets, and bits in the registers */
enum
{
Qdir= 0x8000,
/* data latch register */
Qdlr= 0x0,
/* printer status register */
Qpsr= 0x1,
Fnotbusy= 0x80,
Fack= 0x40,
Fpe= 0x20,
Fselect= 0x10,
Fnoerror= 0x08,
/* printer control register */
Qpcr= 0x2,
Fie= 0x10,
Fselectin= 0x08,
Finitbar= 0x04,
Faf= 0x02,
Fstrobe= 0x01,
/* fake `data register' */
Qdata= 0x3,
};
static int lptready(void*);
static void outch(int, int);
static void lptintr(Ureg*, void*);
static Rendez lptrendez;
Dirtab lptdir[]={
".", {Qdir, 0, QTDIR}, 0, DMDIR|0555,
"dlr", {Qdlr}, 1, 0666,
"psr", {Qpsr}, 5, 0444,
"pcr", {Qpcr}, 0, 0222,
"data", {Qdata}, 0, 0222,
};
static int
lptgen(Chan *c, char*, Dirtab *tab, int ntab, int i, Dir *dp)
{
Qid qid;
if(i == DEVDOTDOT){
mkqid(&qid, Qdir, 0, QTDIR);
devdir(c, qid, ".", 0, eve, 0555, dp);
return 1;
}
i++; /* skip first element for . itself */
if(tab==0 || i>=ntab)
return -1;
tab += i;
qid = tab->qid;
qid.path &= ~Qdir;
if(qid.path < Qdata)
qid.path += lptbase[c->dev];
qid.vers = c->dev;
snprint(up->genbuf, sizeof up->genbuf, "lpt%lud%s", c->dev+1, tab->name);
devdir(c, qid, up->genbuf, tab->length, eve, tab->perm, dp);
return 1;
}
static Chan*
lptattach(char *spec)
{
Chan *c;
int i = (spec && *spec) ? strtol(spec, 0, 0) : 1;
char name[8];
static int set;
if(!set){
outb(lptbase[i-1]+Qpcr, 0); /* turn off interrupts */
set = 1;
intrenable(IrqLPT, lptintr, 0, BUSUNKNOWN, "lpt");
}
if(i < 1 || i > NDEV)
error(Ebadarg);
if(lptallocd[i-1] == 0){
int ecr;
snprint(name, sizeof name, "lpt%d", i-1);
if(ioalloc(lptbase[i-1], 3, 0, name) < 0)
error("lpt port space in use");
lptallocd[i-1] = 1;
/* Detect ECP - if found, put into PS/2 mode to suit style of driver */
ecr = lptbase[i-1] + 0x402;
if ((inb(ecr) & 3) == 1) {
outb(ecr, 0x34);
if (inb(ecr) == 0x35) {
outb(ecr, (inb(ecr) & 0x1f) | (1 << 5));
if(ioalloc(ecr, 1, 0, name) < 0)
error("lpt ecr port space in use");
}
}
}
c = devattach('L', spec);
c->qid.path = Qdir;
c->dev = i-1;
return c;
}
static Walkqid*
lptwalk(Chan *c, Chan *nc, char **name, int nname)
{
return devwalk(c, nc, name, nname, lptdir, nelem(lptdir), lptgen);
}
static int
lptstat(Chan *c, uchar *dp, int n)
{
return devstat(c, dp, n, lptdir, nelem(lptdir), lptgen);
}
static Chan*
lptopen(Chan *c, int omode)
{
return devopen(c, omode, lptdir, nelem(lptdir), lptgen);
}
static void
lptclose(Chan *)
{
}
static long
lptread(Chan *c, void *a, long n, vlong)
{
char str[16];
int size;
ulong o;
if(c->qid.path == Qdir)
return devdirread(c, a, n, lptdir, nelem(lptdir), lptgen);
size = snprint(str, sizeof str, "0x%2.2ux\n", inb(c->qid.path));
o = c->offset;
if(o >= size)
return 0;
if(o+n > size)
n = size-c->offset;
memmove(a, str+o, n);
return n;
}
static long
lptwrite(Chan *c, void *a, long n, vlong)
{
char str[16], *p;
long base, k;
if(n <= 0)
return 0;
if(c->qid.path != Qdata){
if(n > sizeof str-1)
n = sizeof str-1;
memmove(str, a, n);
str[n] = 0;
outb(c->qid.path, strtoul(str, 0, 0));
return n;
}
p = a;
k = n;
base = lptbase[c->dev];
if(waserror()){
outb(base+Qpcr, Finitbar);
nexterror();
}
while(--k >= 0)
outch(base, *p++);
poperror();
return n;
}
static void
outch(int base, int c)
{
int status, tries;
for(tries=0;; tries++) {
status = inb(base+Qpsr);
if(status&Fnotbusy)
break;
if((status&Fpe)==0 && (status&(Fselect|Fnoerror)) != (Fselect|Fnoerror))
error(Eio);
outb(base+Qpcr, Finitbar|Fie);
tsleep(&lptrendez, lptready, (void *)base, 100);
}
outb(base+Qdlr, c);
outb(base+Qpcr, Finitbar|Fstrobe);
outb(base+Qpcr, Finitbar);
}
static int
lptready(void *base)
{
return inb((int)base+Qpsr)&Fnotbusy;
}
static void
lptintr(Ureg *, void *)
{
wakeup(&lptrendez);
}
Dev lptdevtab = {
'L',
"lpt",
devreset,
devinit,
devshutdown,
lptattach,
lptwalk,
lptstat,
lptopen,
devcreate,
lptclose,
lptread,
devbread,
lptwrite,
devbwrite,
devremove,
devwstat,
};
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