/* $NetBSD: lpt_pioc.c,v 1.12 2011/07/19 15:59:53 dyoung Exp $ */
/*
* Copyright (c) 1997 Mark Brinicombe
* Copyright (c) 1997 Causality Limited
* 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.
* 3. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* 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 OR CONTRIBUTERS 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.
*/
/*
* Device Driver for AT parallel printer port
*/
#include <sys/param.h>
__KERNEL_RCSID(0, "$NetBSD: lpt_pioc.c,v 1.12 2011/07/19 15:59:53 dyoung Exp $");
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/bus.h>
#include <machine/intr.h>
#include <acorn32/mainbus/piocvar.h>
#include <dev/ic/lptreg.h>
#include <dev/ic/lptvar.h>
#include "locators.h"
/* Prototypes for functions */
static int lpt_port_test (bus_space_tag_t, bus_space_handle_t, bus_addr_t,
bus_size_t, u_char, u_char);
static int lptprobe (bus_space_tag_t, u_int);
static int lpt_pioc_probe (device_t, cfdata_t , void *);
static void lpt_pioc_attach (device_t, device_t, void *);
/* device attach structure */
CFATTACH_DECL_NEW(lpt_pioc, sizeof(struct lpt_softc),
lpt_pioc_probe, lpt_pioc_attach, NULL, NULL);
/*
* Internal routine to lptprobe to do port tests of one byte value.
*/
static int
lpt_port_test(bus_space_tag_t iot, bus_space_handle_t ioh,
bus_addr_t base, bus_size_t off, u_char data, u_char mask)
{
int timeout;
u_char temp;
data &= mask;
bus_space_write_1(iot, ioh, off, data);
timeout = 1000;
do {
delay(10);
temp = bus_space_read_1(iot, ioh, off) & mask;
} while (temp != data && --timeout);
return (temp == data);
}
/*
* Logic:
* 1) You should be able to write to and read back the same value
* to the data port. Do an alternating zeros, alternating ones,
* walking zero, and walking one test to check for stuck bits.
*
* 2) You should be able to write to and read back the same value
* to the control port lower 5 bits, the upper 3 bits are reserved
* per the IBM PC technical reference manauls and different boards
* do different things with them. Do an alternating zeros, alternating
* ones, walking zero, and walking one test to check for stuck bits.
*
* Some printers drag the strobe line down when the are powered off
* so this bit has been masked out of the control port test.
*
* XXX Some printers may not like a fast pulse on init or strobe, I
* don't know at this point, if that becomes a problem these bits
* should be turned off in the mask byte for the control port test.
*
* 3) Set the data and control ports to a value of 0
*/
static int
lptprobe(bus_space_tag_t iot, u_int iobase)
{
bus_space_handle_t ioh;
u_char mask, data;
int i, rv;
#ifdef DEBUG
#define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \
goto out;} while (0)
#else
#define ABORT goto out
#endif
if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh))
return 0;
rv = 0;
mask = 0xff;
data = 0x55; /* Alternating zeros */
if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask))
ABORT;
data = 0xaa; /* Alternating ones */
if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask))
ABORT;
for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */
data = ~(1 << i);
if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask))
ABORT;
}
for (i = 0; i < CHAR_BIT; i++) { /* Walking one */
data = (1 << i);
if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask))
ABORT;
}
bus_space_write_1(iot, ioh, lpt_data, 0);
bus_space_write_1(iot, ioh, lpt_control, 0);
rv = LPT_NPORTS;
out:
bus_space_unmap(iot, ioh, LPT_NPORTS);
return rv;
}
/*
* int lpt_pioc_probe(device_t parent, cfdata_t cf, void *aux)
*
* Make sure we are trying to attach a lpt device and then
* probe for one.
*/
static int
lpt_pioc_probe(device_t parent, cfdata_t match, void *aux)
{
struct pioc_attach_args *pa = aux;
int rv;
if (pa->pa_name && strcmp(pa->pa_name, "lpt") != 0)
return(0);
/* We need an offset */
if (pa->pa_offset == PIOCCF_OFFSET_DEFAULT)
return(0);
rv = lptprobe(pa->pa_iot, pa->pa_iobase + pa->pa_offset);
if (rv) {
pa->pa_iosize = rv;
return(1);
}
return(0);
}
/*
* void lpt_pioc_attach(device_t parent, device_t self, void *aux)
*
* attach the lpt device
*/
static void
lpt_pioc_attach(device_t parent, device_t self, void *aux)
{
struct lpt_softc *sc = device_private(self);
struct pioc_attach_args *pa = aux;
bus_space_tag_t iot;
bus_space_handle_t ioh;
u_int iobase;
sc->sc_dev = self;
if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT)
aprint_normal("\n");
else
aprint_normal(": polled\n");
iobase = pa->pa_iobase + pa->pa_offset;
iot = sc->sc_iot = pa->pa_iot;
if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) {
aprint_error_dev(self, "couldn't map I/O ports");
return;
}
sc->sc_ioh = ioh;
lpt_attach_subr(sc);
if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT)
sc->sc_ih = intr_claim(pa->pa_irq, IPL_TTY, "lpt",
lptintr, sc);
}
/* End of lpt_pioc.c */