NetBSD/sys/dev/isa/toasterlcd.c

257 lines
7.2 KiB
C

/* $NetBSD: toasterlcd.c,v 1.2 2005/12/11 12:22:03 christos Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jesse Off.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: toasterlcd.c,v 1.2 2005/12/11 12:22:03 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/poll.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/callout.h>
#include <sys/select.h>
#include <sys/conf.h>
#include <machine/bus.h>
#include <machine/autoconf.h>
#include <dev/wscons/wsdisplayvar.h>
#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wscons_callbacks.h>
#include <dev/ic/hd44780reg.h>
#include <dev/ic/hd44780var.h>
#include <dev/isa/tsdiovar.h>
#include <dev/isa/tsdioreg.h>
struct toasterlcd_softc {
struct device sc_dev;
struct hd44780_chip sc_hlcd;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_gpioh;
};
static int toasterlcd_match(struct device *, struct cfdata *, void *);
static void toasterlcd_attach(struct device *, struct device *, void *);
static void toasterlcd_writereg(struct hd44780_chip *, u_int32_t, u_int32_t, u_int8_t);
static u_int8_t toasterlcd_readreg(struct hd44780_chip *, u_int32_t, u_int32_t);
extern const struct wsdisplay_emulops hlcd_emulops;
extern const struct wsdisplay_accessops hlcd_accessops;
extern struct cfdriver toasterlcd_cd;
CFATTACH_DECL(toasterlcd, sizeof(struct toasterlcd_softc),
toasterlcd_match, toasterlcd_attach, NULL, NULL);
static const struct wsscreen_descr toasterlcd_stdscreen = {
"std_toasterlcd", 40, 4,
&hlcd_emulops,
5, 7,
0,
};
static const struct wsscreen_descr *_toasterlcd_scrlist[] = {
&toasterlcd_stdscreen,
};
static const struct wsscreen_list toasterlcd_screenlist = {
sizeof(_toasterlcd_scrlist) / sizeof(struct wsscreen_descr *),
_toasterlcd_scrlist,
};
static int
toasterlcd_match(parent, match, aux)
struct device *parent;
struct cfdata *match;
void *aux;
{
return 1;
}
#define TSDIO_GET(x) bus_space_read_1(sc->sc_iot, sc->sc_gpioh, \
(TSDIO_ ## x))
#define TSDIO_SET(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \
(TSDIO_ ## x), (y))
#define TSDIO_SETBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \
(TSDIO_ ## x), TSDIO_GET(x) | (y))
#define TSDIO_CLEARBITS(x, y) bus_space_write_1(sc->sc_iot, sc->sc_gpioh, \
(TSDIO_ ## x), TSDIO_GET(x) & (~(y)))
static void
toasterlcd_attach(parent, self, aux)
struct device *parent;
struct device *self;
void *aux;
{
struct toasterlcd_softc *sc = (void *)self;
struct tsdio_attach_args *taa = aux;
struct wsemuldisplaydev_attach_args waa;
sc->sc_iot = taa->ta_iot;
sc->sc_gpioh = taa->ta_ioh;
sc->sc_hlcd.sc_dev_ok = 1;
sc->sc_hlcd.sc_cols = 40;
sc->sc_hlcd.sc_vcols = 40;
sc->sc_hlcd.sc_flags = HD_8BIT | HD_MULTILINE | HD_MULTICHIP;
sc->sc_hlcd.sc_dev = self;
sc->sc_hlcd.sc_writereg = toasterlcd_writereg;
sc->sc_hlcd.sc_readreg = toasterlcd_readreg;
TSDIO_SETBITS(DDR, 0x2); /* Port B as outputs */
TSDIO_CLEARBITS(DDR, 0x1); /* Port C as inputs */
TSDIO_CLEARBITS(PBDR, 0xd); /* De-assert EN, De-assert RS */
aprint_normal(": 4x40 text-mode hd44780 LCD\n");
aprint_normal("%s: using port C, bits 0-7 as DB0-DB7\n", sc->sc_dev.dv_xname);
aprint_normal("%s: using port B, bits 0-3 as RS, WR, EN1, EN2\n", sc->sc_dev.dv_xname);
hd44780_attach_subr(&sc->sc_hlcd);
waa.console = 0;
waa.scrdata = &toasterlcd_screenlist;
waa.accessops = &hlcd_accessops;
waa.accesscookie = &sc->sc_hlcd.sc_screen;
config_found(self, &waa, wsemuldisplaydevprint);
}
static void
toasterlcd_writereg(hd, en, rs, cmd)
struct hd44780_chip *hd;
u_int32_t en, rs;
u_int8_t cmd;
{
struct toasterlcd_softc *sc = (struct toasterlcd_softc *)hd->sc_dev;
u_int8_t ctrl;
if (hd->sc_dev_ok == 0)
return;
/* Step 1: Apply RS & WR, Send data */
ctrl = TSDIO_GET(PBDR);
TSDIO_SETBITS(DDR, 0x1); /* set port C to outputs */
TSDIO_SET(PCDR, cmd);
if (rs) {
ctrl |= 0x1; /* assert RS */
ctrl &= ~0x2; /* assert WR */
} else {
ctrl &= ~0x3; /* assert WR, de-assert RS */
}
TSDIO_SET(PBDR, ctrl);
/* Step 2: setup time delay */
delay(1);
/* Step 3: assert EN */
if (en == 1) ctrl |= 0x8;
else ctrl |= 0x4;
TSDIO_SET(PBDR, ctrl);
/* Step 4: pulse time delay */
delay(1);
/* Step 5: de-assert EN */
if (en == 1) ctrl &= ~0x8;
else ctrl &= ~0x4;
TSDIO_SET(PBDR, ctrl);
/* Step 6: hold time delay */
delay(1);
/* Step 7: de-assert WR */
ctrl |= 0x2;
TSDIO_SET(PBDR, ctrl);
/* Step 8: minimum delay till next bus-cycle */
delay(1000);
}
static u_int8_t
toasterlcd_readreg(hd, en, rs)
struct hd44780_chip *hd;
u_int32_t en, rs;
{
struct toasterlcd_softc *sc = (struct toasterlcd_softc *)hd->sc_dev;
u_int8_t ret, ctrl;
if (hd->sc_dev_ok == 0)
return 0;
/* Step 1: Apply RS & WR, Send data */
ctrl = TSDIO_GET(PBDR);
TSDIO_CLEARBITS(DDR, 0x1); /* set port C to inputs */
if (rs) {
ctrl |= 0x3; /* de-assert WR, assert RS */
} else {
ctrl |= 0x2; /* de-assert WR */
ctrl &= ~0x1; /* de-assert RS */
}
TSDIO_SET(PBDR, ctrl);
/* Step 2: setup time delay */
delay(1);
/* Step 3: assert EN */
if (en == 1) ctrl |= 0x8;
else ctrl |= 0x4;
TSDIO_SET(PBDR, ctrl);
/* Step 4: pulse time delay */
delay(1);
/* Step 5: de-assert EN */
ret = TSDIO_GET(PCDR) & 0xff;
if (en == 1) ctrl &= ~0x8;
else ctrl &= ~0x4;
TSDIO_SET(PBDR, ctrl);
/* Step 6: hold time delay + min bus cycle interval*/
delay(1000);
return ret;
}