517 lines
11 KiB
C
517 lines
11 KiB
C
/*-
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* Copyright (c) 2006 Benno Rice.
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* Copyright (C) 2008 MARVELL INTERNATIONAL LTD.
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* All rights reserved.
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*
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* Adapted and extended for Marvell SoCs by Semihalf.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from: FreeBSD: //depot/projects/arm/src/sys/arm/xscale/pxa2x0/pxa2x0_gpio.c, rev 1
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/interrupt.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/rman.h>
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#include <sys/queue.h>
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#include <sys/timetc.h>
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#include <machine/bus.h>
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#include <machine/intr.h>
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#include <arm/mv/mvvar.h>
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#include <arm/mv/mvreg.h>
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#define GPIO_MAX_INTR_COUNT 8
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#define GPIO_PINS_PER_REG 32
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struct mv_gpio_softc {
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struct resource * res[GPIO_MAX_INTR_COUNT + 1];
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void *ih_cookie[GPIO_MAX_INTR_COUNT];
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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uint8_t pin_num; /* number of GPIO pins */
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uint8_t irq_num; /* number of real IRQs occupied by GPIO controller */
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uint8_t use_high;
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};
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extern struct resource_spec mv_gpio_spec[];
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static struct mv_gpio_softc *mv_gpio_softc = NULL;
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static uint32_t gpio_setup[MV_GPIO_MAX_NPINS];
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static int mv_gpio_probe(device_t);
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static int mv_gpio_attach(device_t);
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static void mv_gpio_intr(void *);
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static void mv_gpio_intr_handler(int pin);
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static uint32_t mv_gpio_reg_read(uint32_t reg);
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static void mv_gpio_reg_write(uint32_t reg, uint32_t val);
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static void mv_gpio_reg_set(uint32_t reg, uint32_t val);
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static void mv_gpio_reg_clear(uint32_t reg, uint32_t val);
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static void mv_gpio_blink(uint32_t pin, uint8_t enable);
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static void mv_gpio_polarity(uint32_t pin, uint8_t enable);
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static void mv_gpio_level(uint32_t pin, uint8_t enable);
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static void mv_gpio_edge(uint32_t pin, uint8_t enable);
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static void mv_gpio_out_en(uint32_t pin, uint8_t enable);
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static void mv_gpio_int_ack(uint32_t pin);
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static void mv_gpio_value_set(uint32_t pin, uint8_t val);
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static uint32_t mv_gpio_value_get(uint32_t pin);
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static device_method_t mv_gpio_methods[] = {
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DEVMETHOD(device_probe, mv_gpio_probe),
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DEVMETHOD(device_attach, mv_gpio_attach),
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{ 0, 0 }
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};
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static driver_t mv_gpio_driver = {
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"gpio",
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mv_gpio_methods,
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sizeof(struct mv_gpio_softc),
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};
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static devclass_t mv_gpio_devclass;
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DRIVER_MODULE(gpio, mbus, mv_gpio_driver, mv_gpio_devclass, 0, 0);
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static int
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mv_gpio_probe(device_t dev)
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{
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device_set_desc(dev, "Marvell Integrated GPIO Controller");
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return (0);
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}
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static int
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mv_gpio_attach(device_t dev)
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{
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int error, i;
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struct mv_gpio_softc *sc;
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uint32_t dev_id, rev_id;
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sc = (struct mv_gpio_softc *)device_get_softc(dev);
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if (mv_gpio_softc != NULL)
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return (ENXIO);
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mv_gpio_softc = sc;
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/* Get board id and revision */
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soc_id(&dev_id, &rev_id);
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if (dev_id == MV_DEV_88F5182 ||
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dev_id == MV_DEV_88F5281 ||
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dev_id == MV_DEV_MV78100) {
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sc->pin_num = 32;
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sc->irq_num = 4;
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sc->use_high = 0;
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} else if (dev_id == MV_DEV_88F6281) {
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sc->pin_num = 50;
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sc->irq_num = 7;
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sc->use_high = 1;
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} else {
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device_printf(dev, "unknown board id=0x%x\n", dev_id);
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return (ENXIO);
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}
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error = bus_alloc_resources(dev, mv_gpio_spec, sc->res);
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if (error) {
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device_printf(dev, "could not allocate resources\n");
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return (ENXIO);
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}
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sc->bst = rman_get_bustag(sc->res[0]);
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sc->bsh = rman_get_bushandle(sc->res[0]);
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/* Disable and clear all interrupts */
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bus_space_write_4(sc->bst, sc->bsh, GPIO_INT_EDGE_MASK, 0);
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bus_space_write_4(sc->bst, sc->bsh, GPIO_INT_LEV_MASK, 0);
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bus_space_write_4(sc->bst, sc->bsh, GPIO_INT_CAUSE, 0);
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if (sc->use_high) {
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bus_space_write_4(sc->bst, sc->bsh,
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GPIO_HI_INT_EDGE_MASK, 0);
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bus_space_write_4(sc->bst, sc->bsh,
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GPIO_HI_INT_LEV_MASK, 0);
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bus_space_write_4(sc->bst, sc->bsh,
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GPIO_HI_INT_CAUSE, 0);
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}
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for (i = 0; i < sc->irq_num; i++) {
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if (bus_setup_intr(dev, sc->res[1 + i],
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INTR_TYPE_MISC | INTR_FAST,
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(driver_filter_t *)mv_gpio_intr, NULL,
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sc, &sc->ih_cookie[i]) != 0) {
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bus_release_resources(dev, mv_gpio_spec, sc->res);
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device_printf(dev, "could not set up intr %d\n", i);
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return (ENXIO);
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}
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}
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return (0);
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}
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static void
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mv_gpio_intr(void *arg)
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{
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uint32_t int_cause, gpio_val;
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uint32_t int_cause_hi, gpio_val_hi = 0;
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int i;
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int_cause = mv_gpio_reg_read(GPIO_INT_CAUSE);
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gpio_val = mv_gpio_reg_read(GPIO_DATA_IN);
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gpio_val &= int_cause;
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if (mv_gpio_softc->use_high) {
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int_cause_hi = mv_gpio_reg_read(GPIO_HI_INT_CAUSE);
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gpio_val_hi = mv_gpio_reg_read(GPIO_HI_DATA_IN);
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gpio_val_hi &= int_cause_hi;
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}
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i = 0;
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while (gpio_val != 0) {
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if (gpio_val & 1)
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mv_gpio_intr_handler(i);
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gpio_val >>= 1;
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i++;
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}
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if (mv_gpio_softc->use_high) {
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i = 0;
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while (gpio_val_hi != 0) {
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if (gpio_val_hi & 1)
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mv_gpio_intr_handler(i + GPIO_PINS_PER_REG);
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gpio_val_hi >>= 1;
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i++;
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}
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}
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}
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/*
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* GPIO interrupt handling
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*/
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static struct intr_event *gpio_events[MV_GPIO_MAX_NPINS];
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int
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mv_gpio_setup_intrhandler(const char *name, driver_filter_t *filt,
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void (*hand)(void *), void *arg, int pin, int flags, void **cookiep)
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{
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struct intr_event *event;
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int error;
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if (pin < 0 || pin >= mv_gpio_softc->pin_num)
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return (ENXIO);
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event = gpio_events[pin];
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if (event == NULL) {
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error = intr_event_create(&event, (void *)pin, 0, pin,
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(void (*)(void *))mv_gpio_intr_mask,
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(void (*)(void *))mv_gpio_intr_unmask,
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(void (*)(void *))mv_gpio_int_ack,
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NULL,
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"gpio%d:", pin);
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if (error != 0)
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return (error);
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gpio_events[pin] = event;
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}
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intr_event_add_handler(event, name, filt, hand, arg,
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intr_priority(flags), flags, cookiep);
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return (0);
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}
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void
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mv_gpio_intr_mask(int pin)
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{
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if (pin >= mv_gpio_softc->pin_num)
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return;
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if (gpio_setup[pin] & MV_GPIO_EDGE)
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mv_gpio_edge(pin, 0);
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else
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mv_gpio_level(pin, 0);
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}
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void
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mv_gpio_intr_unmask(int pin)
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{
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if (pin >= mv_gpio_softc->pin_num)
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return;
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if (gpio_setup[pin] & MV_GPIO_EDGE)
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mv_gpio_edge(pin, 1);
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else
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mv_gpio_level(pin, 1);
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}
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static void
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mv_gpio_intr_handler(int pin)
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{
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struct intr_event *event;
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event = gpio_events[pin];
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if (event == NULL || TAILQ_EMPTY(&event->ie_handlers))
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return;
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intr_event_handle(event, NULL);
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}
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int
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mv_gpio_configure(uint32_t pin, uint32_t flags, uint32_t mask)
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{
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if (pin >= mv_gpio_softc->pin_num)
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return (EINVAL);
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if (mask & MV_GPIO_BLINK)
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mv_gpio_blink(pin, flags & MV_GPIO_BLINK);
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if (mask & MV_GPIO_POLARITY)
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mv_gpio_polarity(pin, flags & MV_GPIO_POLARITY);
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if (mask & MV_GPIO_EDGE)
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mv_gpio_edge(pin, flags & MV_GPIO_EDGE);
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if (mask & MV_GPIO_LEVEL)
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mv_gpio_level(pin, flags & MV_GPIO_LEVEL);
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gpio_setup[pin] &= ~(mask);
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gpio_setup[pin] |= (flags & mask);
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return (0);
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}
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void
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mv_gpio_out(uint32_t pin, uint8_t val, uint8_t enable)
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{
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mv_gpio_value_set(pin, val);
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mv_gpio_out_en(pin, enable);
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}
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uint8_t
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mv_gpio_in(uint32_t pin)
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{
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return (mv_gpio_value_get(pin));
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}
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static uint32_t
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mv_gpio_reg_read(uint32_t reg)
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{
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return (bus_space_read_4(mv_gpio_softc->bst,
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mv_gpio_softc->bsh, reg));
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}
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static void
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mv_gpio_reg_write(uint32_t reg, uint32_t val)
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{
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bus_space_write_4(mv_gpio_softc->bst,
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mv_gpio_softc->bsh, reg, val);
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}
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static void
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mv_gpio_reg_set(uint32_t reg, uint32_t pin)
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{
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uint32_t reg_val;
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reg_val = mv_gpio_reg_read(reg);
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reg_val |= GPIO(pin);
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mv_gpio_reg_write(reg, reg_val);
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}
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static void
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mv_gpio_reg_clear(uint32_t reg, uint32_t pin)
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{
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uint32_t reg_val;
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reg_val = mv_gpio_reg_read(reg);
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reg_val &= ~(GPIO(pin));
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mv_gpio_reg_write(reg, reg_val);
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}
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static void
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mv_gpio_out_en(uint32_t pin, uint8_t enable)
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{
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uint32_t reg;
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if (pin >= mv_gpio_softc->pin_num)
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return;
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if (pin >= GPIO_PINS_PER_REG) {
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reg = GPIO_HI_DATA_OUT_EN_CTRL;
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pin -= GPIO_PINS_PER_REG;
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} else
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reg = GPIO_DATA_OUT_EN_CTRL;
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if (enable)
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mv_gpio_reg_clear(reg, pin);
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else
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mv_gpio_reg_set(reg, pin);
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}
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static void
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mv_gpio_blink(uint32_t pin, uint8_t enable)
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{
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uint32_t reg;
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if (pin >= mv_gpio_softc->pin_num)
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return;
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if (pin >= GPIO_PINS_PER_REG) {
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reg = GPIO_HI_BLINK_EN;
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pin -= GPIO_PINS_PER_REG;
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} else
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reg = GPIO_BLINK_EN;
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if (enable)
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mv_gpio_reg_set(reg, pin);
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else
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mv_gpio_reg_clear(reg, pin);
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}
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static void
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mv_gpio_polarity(uint32_t pin, uint8_t enable)
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{
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uint32_t reg;
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if (pin >= mv_gpio_softc->pin_num)
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return;
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if (pin >= GPIO_PINS_PER_REG) {
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reg = GPIO_HI_DATA_IN_POLAR;
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pin -= GPIO_PINS_PER_REG;
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} else
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reg = GPIO_DATA_IN_POLAR;
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if (enable)
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mv_gpio_reg_set(reg, pin);
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else
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mv_gpio_reg_clear(reg, pin);
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}
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static void
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mv_gpio_level(uint32_t pin, uint8_t enable)
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{
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uint32_t reg;
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if (pin >= mv_gpio_softc->pin_num)
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return;
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if (pin >= GPIO_PINS_PER_REG) {
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reg = GPIO_HI_INT_LEV_MASK;
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pin -= GPIO_PINS_PER_REG;
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} else
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reg = GPIO_INT_LEV_MASK;
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if (enable)
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mv_gpio_reg_set(reg, pin);
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else
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mv_gpio_reg_clear(reg, pin);
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}
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static void
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mv_gpio_edge(uint32_t pin, uint8_t enable)
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{
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uint32_t reg;
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if (pin >= mv_gpio_softc->pin_num)
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return;
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if (pin >= GPIO_PINS_PER_REG) {
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reg = GPIO_HI_INT_EDGE_MASK;
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pin -= GPIO_PINS_PER_REG;
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} else
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reg = GPIO_INT_EDGE_MASK;
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if (enable)
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mv_gpio_reg_set(reg, pin);
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else
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mv_gpio_reg_clear(reg, pin);
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}
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static void
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mv_gpio_int_ack(uint32_t pin)
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{
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uint32_t reg;
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if (pin >= mv_gpio_softc->pin_num)
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return;
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if (pin >= GPIO_PINS_PER_REG) {
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reg = GPIO_HI_INT_CAUSE;
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pin -= GPIO_PINS_PER_REG;
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} else
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reg = GPIO_INT_CAUSE;
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mv_gpio_reg_clear(reg, pin);
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}
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static uint32_t
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mv_gpio_value_get(uint32_t pin)
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{
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uint32_t reg, reg_val;
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if (pin >= mv_gpio_softc->pin_num)
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return (0);
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if (pin >= GPIO_PINS_PER_REG) {
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reg = GPIO_HI_DATA_IN;
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pin -= GPIO_PINS_PER_REG;
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} else
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reg = GPIO_DATA_IN;
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reg_val = mv_gpio_reg_read(reg);
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return (reg_val & GPIO(pin));
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}
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static void
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mv_gpio_value_set(uint32_t pin, uint8_t val)
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{
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uint32_t reg;
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if (pin >= mv_gpio_softc->pin_num)
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return;
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if (pin >= GPIO_PINS_PER_REG) {
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reg = GPIO_HI_DATA_OUT;
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pin -= GPIO_PINS_PER_REG;
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} else
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reg = GPIO_DATA_OUT;
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if (val)
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mv_gpio_reg_set(reg, pin);
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else
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mv_gpio_reg_clear(reg, pin);
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}
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