144 lines
4.0 KiB
C
144 lines
4.0 KiB
C
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/*-
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* Copyright (c) 2011 Ben Gray <ben.r.gray@gmail.com>.
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* Copyright (c) 2014 Andrew Turner <andrew@FreeBSD.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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* 3. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BEN GRAY ``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 BEN GRAY BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/gpio.h>
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#include <machine/bus.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <arm/ti/ti_cpuid.h>
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#include <arm/ti/ti_gpio.h>
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#include <arm/ti/ti_scm.h>
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#include <arm/ti/omap4/omap4_scm_padconf.h>
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#include "ti_gpio_if.h"
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static struct ofw_compat_data compat_data[] = {
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{"ti,omap4-gpio", 1},
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{"ti,gpio", 1},
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{NULL, 0},
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};
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static int
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omap4_gpio_probe(device_t dev)
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{
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if (ti_chip() != CHIP_OMAP_4)
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return (ENXIO);
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "Ti OMAP4 General Purpose I/O (GPIO)");
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return (0);
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}
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static int
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omap4_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags)
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{
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unsigned int state = 0;
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/* First the SCM driver needs to be told to put the pad into GPIO mode */
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if (flags & GPIO_PIN_OUTPUT)
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state = PADCONF_PIN_OUTPUT;
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else if (flags & GPIO_PIN_INPUT) {
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if (flags & GPIO_PIN_PULLUP)
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state = PADCONF_PIN_INPUT_PULLUP;
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else if (flags & GPIO_PIN_PULLDOWN)
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state = PADCONF_PIN_INPUT_PULLDOWN;
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else
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state = PADCONF_PIN_INPUT;
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}
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return ti_scm_padconf_set_gpiomode(gpio, state);
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}
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static int
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omap4_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags)
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{
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unsigned int state;
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/* Get the current pin state */
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if (ti_scm_padconf_get_gpiomode(gpio, &state) != 0) {
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*flags = 0;
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return (EINVAL);
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} else {
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switch (state) {
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case PADCONF_PIN_OUTPUT:
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*flags = GPIO_PIN_OUTPUT;
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break;
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case PADCONF_PIN_INPUT:
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*flags = GPIO_PIN_INPUT;
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break;
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case PADCONF_PIN_INPUT_PULLUP:
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*flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP;
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break;
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case PADCONF_PIN_INPUT_PULLDOWN:
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*flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN;
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break;
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default:
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*flags = 0;
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break;
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}
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}
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return (0);
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}
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static device_method_t omap4_gpio_methods[] = {
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/* bus interface */
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DEVMETHOD(device_probe, omap4_gpio_probe),
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/* ti_gpio interface */
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DEVMETHOD(ti_gpio_set_flags, omap4_gpio_set_flags),
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DEVMETHOD(ti_gpio_get_flags, omap4_gpio_get_flags),
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DEVMETHOD_END
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};
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extern driver_t ti_gpio_driver;
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static devclass_t omap4_gpio_devclass;
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DEFINE_CLASS_1(gpio, omap4_gpio_driver, omap4_gpio_methods,
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sizeof(struct ti_gpio_softc), ti_gpio_driver);
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DRIVER_MODULE(omap4_gpio, simplebus, omap4_gpio_driver, omap4_gpio_devclass,
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0, 0);
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