159 lines
5.0 KiB
C
159 lines
5.0 KiB
C
/* $NetBSD: ppbus_gpio.c,v 1.1 2008/04/29 14:07:37 cegger Exp $ */
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/*
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* Copyright (c) 2008, Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ppbus_gpio.c,v 1.1 2008/04/29 14:07:37 cegger Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/gpio.h>
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#include <sys/kernel.h>
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#include <dev/gpio/gpiovar.h>
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#include <dev/ppbus/ppbus_conf.h>
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#include <dev/ppbus/ppbus_base.h>
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#include <dev/ppbus/ppbus_io.h>
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static int gpio_ppbus_open(void *, device_t);
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static void gpio_ppbus_close(void *, device_t);
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static int gpio_ppbus_pin_read(void *, int);
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static void gpio_ppbus_pin_write(void *, int, int);
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static void gpio_ppbus_pin_ctl(void *, int, int);
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#define PORT(r, b, i) { PPBUS_R##r##TR, PPBUS_W##r##TR, b, i}
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static const struct {
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u_char rreg;
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u_char wreg;
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u_char bit;
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u_char inv;
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} ppbus_port[PPBUS_NPINS] = { /* parallel port wiring: */
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PORT(C, 0, 1), /* 1: /C0 Output */
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PORT(D, 0, 0), /* 2: D0 Output */
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PORT(D, 1, 0), /* 3: D1 Output */
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PORT(D, 2, 0), /* 4: D2 Output */
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PORT(D, 3, 0), /* 5: D3 Output */
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PORT(D, 4, 0), /* 6: D4 Output */
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PORT(D, 5, 0), /* 7: D5 Output */
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PORT(D, 6, 0), /* 8: D6 Output */
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PORT(D, 7, 0), /* 9: D7 Output */
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PORT(S, 6, 0), /* 10: S6 Input */
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PORT(S, 7, 1), /* 11: /S7 Input */
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PORT(S, 5, 0), /* 12: S5 Input */
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PORT(S, 4, 0), /* 13: S4 Input */
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PORT(C, 1, 1), /* 14: /C1 Output */
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PORT(S, 3, 0), /* 15: S3 Input */
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PORT(C, 2, 0), /* 16: C2 Output */
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PORT(C, 3, 1), /* 17: /C3 Output */
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}; /* 18-25: GND */
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void
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gpio_ppbus_attach(struct ppbus_softc *sc)
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{
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struct gpiobus_attach_args gba;
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gpio_pin_t *pin;
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int i;
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for (pin = &sc->sc_gpio_pins[0], i = 0; i < PPBUS_NPINS; pin++, i++) {
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pin->pin_num = i;
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if (((i >= 9) && (i <= 12)) || (i == 14)) {
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pin->pin_caps = GPIO_PIN_INPUT;
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pin->pin_flags = GPIO_PIN_INPUT;
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pin->pin_state = gpio_ppbus_pin_read(sc, i);
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} else {
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pin->pin_caps = GPIO_PIN_OUTPUT;
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pin->pin_flags = GPIO_PIN_OUTPUT;
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pin->pin_state = GPIO_PIN_LOW;
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gpio_ppbus_pin_write(sc, i, pin->pin_state);
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}
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gpio_ppbus_pin_ctl(sc, i, pin->pin_flags);
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}
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sc->sc_gpio_gc.gp_cookie = sc;
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sc->sc_gpio_gc.gp_gc_open = gpio_ppbus_open;
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sc->sc_gpio_gc.gp_gc_close = gpio_ppbus_close;
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sc->sc_gpio_gc.gp_pin_read = gpio_ppbus_pin_read;
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sc->sc_gpio_gc.gp_pin_write = gpio_ppbus_pin_write;
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sc->sc_gpio_gc.gp_pin_ctl = gpio_ppbus_pin_ctl;
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gba.gba_gc = &sc->sc_gpio_gc;
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gba.gba_pins = sc->sc_gpio_pins;
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gba.gba_npins = PPBUS_NPINS;
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config_found_ia(sc->sc_dev, "gpiobus", &gba, gpiobus_print);
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}
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static int
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gpio_ppbus_open(void *arg, device_t dev)
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{
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struct ppbus_softc *sc = arg;
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return ppbus_request_bus(sc->sc_dev, dev, PPBUS_WAIT|PPBUS_INTR, (hz));
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}
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static void
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gpio_ppbus_close(void *arg, device_t dev)
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{
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struct ppbus_softc *sc = arg;
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(void) ppbus_release_bus(sc->sc_dev, dev, PPBUS_WAIT|PPBUS_INTR, (hz));
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}
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static int
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gpio_ppbus_pin_read(void *arg, int pin)
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{
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struct ppbus_softc *sc = arg;
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u_char port = ppbus_io(sc->sc_dev, ppbus_port[pin].rreg, NULL, 0, 0);
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return ((port >> ppbus_port[pin].bit) & 1) ^ ppbus_port[pin].inv;
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}
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static void
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gpio_ppbus_pin_write(void *arg, int pin, int value)
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{
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struct ppbus_softc *sc = arg;
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u_char port = ppbus_io(sc->sc_dev, ppbus_port[pin].rreg, NULL, 0, 0);
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value ^= ppbus_port[pin].inv;
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value <<= ppbus_port[pin].bit;
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port &= ~(1 << ppbus_port[pin].bit);
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port |= value;
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ppbus_io(sc->sc_dev, ppbus_port[pin].wreg, NULL, 0, port);
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}
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static void
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gpio_ppbus_pin_ctl(void *arg, int pin, int flags)
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{
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/* can't change parallel port pin configuration */
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}
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