2000/0813/pc/devlpt.c (diff list | history)

2000/0813/sys/src/9/pc/devlpt.c:1,230 – 2001/0413/sys/src/9/pc/devlpt.c:1,241 (short | long | prev | next)
Handle ECP parallel ports. rsc Fri Mar 4 12:44:25 2005
1991/1204		#include "u.h"
1992/0321		#include "../port/lib.h"
1991/1204		#include "mem.h" #include "dat.h" #include "fns.h" #include "io.h"
1992/0111		#include "../port/error.h"
1991/1204		/* Centronix parallel (printer) port */ /* base addresses */
1992/0205		static int lptbase[] = {
1994/0324		0x378, /* lpt1 */ 0x3bc, /* lpt2 */
1991/1204		0x278 /* lpt3 (sic) */ };
1999/0714		#define NDEV nelem(lptbase) static int lptallocd[NDEV];
1991/1204		/* offsets, and bits in the registers */ enum { /* 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);
1994/0324		static void lptintr(Ureg*, void*);
1991/1204		static Rendez lptrendez; Dirtab lptdir[]={ "dlr", {Qdlr}, 1, 0666, "psr", {Qpsr}, 5, 0444, "pcr", {Qpcr}, 0, 0222, "data", {Qdata}, 0, 0222, }; static int lptgen(Chan *c, Dirtab *tab, int ntab, int i, Dir *dp) { Qid qid; char name[NAMELEN];
1999/1230		if(i == DEVDOTDOT){ sprint(name, "#L%lud", c->dev+1); devdir(c, (Qid){CHDIR, 0}, name, 0, eve, 0555, dp); return 1; }
1991/1204		if(tab==0 || i>=ntab) return -1; tab += i; qid = tab->qid; if(qid.path < Qdata) qid.path += lptbase[c->dev]; qid.vers = c->dev;
1998/0825		sprint(name, "lpt%lud%s", c->dev+1, tab->name);
1991/1204		devdir(c, qid, name, tab->length, eve, tab->perm, dp); return 1; }
1997/0327		static Chan*
1991/1204		lptattach(char *spec) { Chan *c; int i = (spec && *spec) ? strtol(spec, 0, 0) : 1;
1999/0714		char name[5];
1993/0224		static int set;
1991/1204
1993/0224		if(!set){
1994/0513		outb(lptbase[i-1]+Qpcr, 0); /* turn off interrupts */
1993/0224		set = 1;
1999/0819		intrenable(IrqLPT, lptintr, 0, BUSUNKNOWN, "lpt");
1993/0224		}
1991/1204		if(i < 1 || i > NDEV)
1992/0114		error(Ebadarg);
1999/0714		if(lptallocd[i-1] == 0){
2001/0413		int ecr;
1999/0714		sprint(name, "lpt%d", i-1); if(ioalloc(lptbase[i-1], 3, 0, name) < 0) error("lpt port space in use"); lptallocd[i-1] = 1;
2001/0413		// 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"); } }
1999/0714		}
1991/1204		c = devattach('L', spec); c->dev = i-1; return c; }
1997/0327		static int
1991/1204		lptwalk(Chan *c, char *name) {
1997/0327		return devwalk(c, name, lptdir, nelem(lptdir), lptgen);
1991/1204		}
1997/0327		static void
1991/1204		lptstat(Chan *c, char *dp) {
1997/0327		devstat(c, dp, lptdir, nelem(lptdir), lptgen);
1991/1204		}
1997/0327		static Chan*
1991/1204		lptopen(Chan *c, int omode) {
1997/0327		return devopen(c, omode, lptdir, nelem(lptdir), lptgen);
1991/1204		}
1997/0327		static void
1998/0319		lptclose(Chan *)
1992/0711		{ }
1991/1204
1997/0327		static long
1998/0319		lptread(Chan *c, void *a, long n, vlong)
1991/1204		{
1998/0319		char str[16]; int size; ulong o;
1991/1204		if(c->qid.path == CHDIR)
1997/0327		return devdirread(c, a, n, lptdir, nelem(lptdir), lptgen);
1991/1204		size = sprint(str, "0x%2.2ux\n", inb(c->qid.path));
1998/0319		o = c->offset; if(o >= size)
1991/1204		return 0;
1998/0319		if(o+n > size)
1991/1204		n = size-c->offset;
1998/0319		memmove(a, str+o, n);
1991/1204		return n; }
1997/0327		static long
1998/0319		lptwrite(Chan *c, void *a, long n, vlong)
1995/0108		{
1991/1204		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;
1995/0108		}
1991/1204		static void outch(int base, int c) {
1994/0331		int status, tries;
1991/1204
2000/0813		for(tries=0;; tries++) {
1994/0331		status = inb(base+Qpsr);
2000/0813		if(status&Fnotbusy)
1994/0331		break;
2000/0813		if((status&Fpe)==0 && (status&(Fselect|Fnoerror)) != (Fselect|Fnoerror)) error(Eio); if(tries < 10) tsleep(&lptrendez, return0, nil, 1); else {
1994/0331		outb(base+Qpcr, Finitbar|Fie);
2000/0813		tsleep(&lptrendez, lptready, (void *)base, 100);
1994/0331		}
1991/1204		} 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
1998/0319		lptintr(Ureg *, void *)
1991/1204		{ wakeup(&lptrendez); }
1997/0327		Dev lptdevtab = {
1997/0408		'L', "lpt",
1997/0327		devreset, devinit, lptattach, devclone, lptwalk, lptstat, lptopen, devcreate, lptclose, lptread, devbread, lptwrite, devbwrite, devremove, devwstat, };