diff options
Diffstat (limited to 'sys/arm/ti/omap4/omap4_gpio.c')
| -rw-r--r-- | sys/arm/ti/omap4/omap4_gpio.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/sys/arm/ti/omap4/omap4_gpio.c b/sys/arm/ti/omap4/omap4_gpio.c new file mode 100644 index 000000000000..faf2339411b6 --- /dev/null +++ b/sys/arm/ti/omap4/omap4_gpio.c @@ -0,0 +1,149 @@ +/*- + * Copyright (c) 2011 Ben Gray <ben.r.gray@gmail.com>. + * Copyright (c) 2014 Andrew Turner <andrew@FreeBSD.org> + * All rights reserved. + * + * 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. The name of the company nor the name of the author may be used to + * endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY BEN GRAY ``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 BEN GRAY 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> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/bus.h> +#include <sys/gpio.h> + +#include <machine/bus.h> +#include <machine/intr.h> + +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <arm/ti/ti_cpuid.h> +#include <arm/ti/ti_gpio.h> +#include <arm/ti/ti_pinmux.h> + +#include <arm/ti/omap4/omap4_scm_padconf.h> + +#include "ti_gpio_if.h" + +static struct ofw_compat_data compat_data[] = { + {"ti,omap4-gpio", 1}, + {"ti,gpio", 1}, + {NULL, 0}, +}; + +static int +omap4_gpio_probe(device_t dev) +{ + + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) + return (ENXIO); + if (ti_chip() != CHIP_OMAP_4) + return (ENXIO); + + device_set_desc(dev, "TI OMAP4 General Purpose I/O (GPIO)"); + + return (0); +} + +static int +omap4_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags) +{ + unsigned int state = 0; + struct ti_gpio_softc *sc; + + sc = device_get_softc(dev); + /* First the SCM driver needs to be told to put the pad into GPIO mode */ + if (flags & GPIO_PIN_OUTPUT) + state = PADCONF_PIN_OUTPUT; + else if (flags & GPIO_PIN_INPUT) { + if (flags & GPIO_PIN_PULLUP) + state = PADCONF_PIN_INPUT_PULLUP; + else if (flags & GPIO_PIN_PULLDOWN) + state = PADCONF_PIN_INPUT_PULLDOWN; + else + state = PADCONF_PIN_INPUT; + } + return ti_pinmux_padconf_set_gpiomode((sc->sc_bank-1)*32 + gpio, state); +} + +static int +omap4_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags) +{ + unsigned int state; + struct ti_gpio_softc *sc; + + sc = device_get_softc(dev); + + /* Get the current pin state */ + if (ti_pinmux_padconf_get_gpiomode((sc->sc_bank-1)*32 + gpio, &state) != 0) { + *flags = 0; + return (EINVAL); + } else { + switch (state) { + case PADCONF_PIN_OUTPUT: + *flags = GPIO_PIN_OUTPUT; + break; + case PADCONF_PIN_INPUT: + *flags = GPIO_PIN_INPUT; + break; + case PADCONF_PIN_INPUT_PULLUP: + *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP; + break; + case PADCONF_PIN_INPUT_PULLDOWN: + *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN; + break; + default: + *flags = 0; + break; + } + } + + return (0); +} + +static device_method_t omap4_gpio_methods[] = { + /* bus interface */ + DEVMETHOD(device_probe, omap4_gpio_probe), + + /* ti_gpio interface */ + DEVMETHOD(ti_gpio_set_flags, omap4_gpio_set_flags), + DEVMETHOD(ti_gpio_get_flags, omap4_gpio_get_flags), + + DEVMETHOD_END +}; + +extern driver_t ti_gpio_driver; +static devclass_t omap4_gpio_devclass; + +DEFINE_CLASS_1(gpio, omap4_gpio_driver, omap4_gpio_methods, + sizeof(struct ti_gpio_softc), ti_gpio_driver); +DRIVER_MODULE(omap4_gpio, simplebus, omap4_gpio_driver, omap4_gpio_devclass, + 0, 0); |