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142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
/* $NetBSD: admgpio.c,v 1.4 2011/07/01 18:38:49 dyoung Exp $ */
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/*-
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* Copyright (c) 2007 David Young. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions 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
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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* OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: admgpio.c,v 1.4 2011/07/01 18:38:49 dyoung 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> /* for hz */
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#include <sys/bus.h>
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#include <dev/gpio/gpiovar.h>
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#include <mips/adm5120/include/adm5120reg.h>
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#include <mips/adm5120/include/adm5120var.h>
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#include <mips/adm5120/include/adm5120_mainbusvar.h>
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static inline uint32_t
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admgpio_read(struct mainbus_softc *sc)
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{
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return bus_space_read_4(sc->sc_obiot, sc->sc_gpioh, ADM5120_GPIO0);
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}
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static inline void
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admgpio_write(struct mainbus_softc *sc, uint32_t val)
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{
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bus_space_write_4(sc->sc_obiot, sc->sc_gpioh, ADM5120_GPIO0, val);
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}
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static void
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admgpio_pin_ctl(void *cookie, int pin, int flags)
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{
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struct mainbus_softc *sc = cookie;
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uint32_t gpio0, mask;
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KASSERT(flags == GPIO_PIN_INPUT || flags == GPIO_PIN_OUTPUT);
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mask = __SHIFTIN(1 << pin, ADM5120_GPIO0_OE);
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gpio0 = admgpio_read(sc);
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if (flags == GPIO_PIN_OUTPUT)
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admgpio_write(sc, gpio0 | mask);
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else
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admgpio_write(sc, gpio0 & ~mask);
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}
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static int
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admgpio_pin_read(void *cookie, int pin)
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{
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struct mainbus_softc *sc = cookie;
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uint32_t gpio0, mask;
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KASSERT(pin >= 0 && pin < 8);
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if (sc->sc_pins[pin].pin_flags == GPIO_PIN_INPUT)
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mask = __SHIFTIN(1 << pin, ADM5120_GPIO0_IV);
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else
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mask = __SHIFTIN(1 << pin, ADM5120_GPIO0_OV);
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gpio0 = admgpio_read(sc);
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return ((gpio0 & mask) != 0) ? GPIO_PIN_HIGH : GPIO_PIN_LOW;
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}
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static void
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admgpio_pin_write(void *cookie, int pin, int value)
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{
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struct mainbus_softc *sc = cookie;
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uint32_t gpio0, mask;
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KASSERT(pin >= 0 && pin < 8);
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mask = __SHIFTIN(1 << pin, ADM5120_GPIO0_OV);
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gpio0 = admgpio_read(sc);
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admgpio_write(sc,
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(value == GPIO_PIN_HIGH) ? (gpio0 | mask) : (gpio0 & ~mask));
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}
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device_t
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admgpio_attach(struct mainbus_softc *sc)
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{
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int pin;
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uint32_t oe;
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struct gpiobus_attach_args gba;
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oe = __SHIFTOUT(admgpio_read(sc), ADM5120_GPIO0_OE);
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for (pin = 0; pin < __arraycount(sc->sc_pins); pin++) {
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sc->sc_pins[pin].pin_num = pin;
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sc->sc_pins[pin].pin_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT;
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if ((oe & (1 << pin)) != 0)
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sc->sc_pins[pin].pin_flags = GPIO_PIN_OUTPUT;
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else
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sc->sc_pins[pin].pin_flags = GPIO_PIN_INPUT;
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sc->sc_pins[pin].pin_state = admgpio_pin_read(sc, pin);
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}
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sc->sc_gp.gp_cookie = sc;
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sc->sc_gp.gp_pin_read = admgpio_pin_read;
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sc->sc_gp.gp_pin_write = admgpio_pin_write;
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sc->sc_gp.gp_pin_ctl = admgpio_pin_ctl;
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gba.gba_gc = &sc->sc_gp;
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gba.gba_pins = &sc->sc_pins[0];
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gba.gba_npins = __arraycount(sc->sc_pins);
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/* Attach GPIO framework */
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return config_found_ia(sc->sc_dev, "gpiobus", &gba, gpiobus_print);
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}
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