diff options
Diffstat (limited to 'sys/arm/ti/am335x/am335x_gpio.c')
| -rw-r--r-- | sys/arm/ti/am335x/am335x_gpio.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/sys/arm/ti/am335x/am335x_gpio.c b/sys/arm/ti/am335x/am335x_gpio.c new file mode 100644 index 000000000000..beb169b3e4b5 --- /dev/null +++ b/sys/arm/ti/am335x/am335x_gpio.c @@ -0,0 +1,158 @@ +/*- + * Copyright (c) 2012 Damjan Marion <dmarion@FreeBSD.org> + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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/resource.h> +#include <sys/rman.h> +#include <sys/lock.h> +#include <sys/malloc.h> + +#include <machine/bus.h> +#include <machine/resource.h> +#include <machine/intr.h> +#include <sys/gpio.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/am335x/am335x_scm_padconf.h> + +#include "ti_gpio_if.h" + +static struct ofw_compat_data compat_data[] = { + {"ti,am335x-gpio", 1}, + /* Linux uses ti,omap4-gpio on am335x so we need to support it */ + {"ti,omap4-gpio", 1}, + {"ti,gpio", 1}, + {NULL, 0}, +}; + +static int +am335x_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_AM335X) + return (ENXIO); + + device_set_desc(dev, "TI AM335x General Purpose I/O (GPIO)"); + + return (0); +} + +static int +am335x_gpio_set_flags(device_t dev, uint32_t gpio, uint32_t flags) +{ + unsigned int state = 0; + struct ti_gpio_softc *sc = device_get_softc(dev); + + if (flags & GPIO_PIN_OUTPUT) { + if (flags & GPIO_PIN_PULLUP) + state = PADCONF_OUTPUT_PULLUP; + else + state = PADCONF_OUTPUT; + } else if (flags & GPIO_PIN_INPUT) { + if (flags & GPIO_PIN_PULLUP) + state = PADCONF_INPUT_PULLUP; + else if (flags & GPIO_PIN_PULLDOWN) + state = PADCONF_INPUT_PULLDOWN; + else + state = PADCONF_INPUT; + } + return ti_pinmux_padconf_set_gpiomode(sc->sc_bank*32 + gpio, state); +} + +static int +am335x_gpio_get_flags(device_t dev, uint32_t gpio, uint32_t *flags) +{ + unsigned int state; + struct ti_gpio_softc *sc = device_get_softc(dev); + + if (ti_pinmux_padconf_get_gpiomode(sc->sc_bank*32 + gpio, &state) != 0) { + *flags = 0; + return (EINVAL); + } else { + switch (state) { + case PADCONF_OUTPUT: + *flags = GPIO_PIN_OUTPUT; + break; + case PADCONF_OUTPUT_PULLUP: + *flags = GPIO_PIN_OUTPUT | GPIO_PIN_PULLUP; + break; + case PADCONF_INPUT: + *flags = GPIO_PIN_INPUT; + break; + case PADCONF_INPUT_PULLUP: + *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLUP; + break; + case PADCONF_INPUT_PULLDOWN: + *flags = GPIO_PIN_INPUT | GPIO_PIN_PULLDOWN; + break; + default: + *flags = 0; + break; + } + } + + return (0); +} + +static device_method_t am335x_gpio_methods[] = { + /* bus interface */ + DEVMETHOD(device_probe, am335x_gpio_probe), + + /* ti_gpio interface */ + DEVMETHOD(ti_gpio_set_flags, am335x_gpio_set_flags), + DEVMETHOD(ti_gpio_get_flags, am335x_gpio_get_flags), + + DEVMETHOD_END +}; + +extern driver_t ti_gpio_driver; +static devclass_t am335x_gpio_devclass; + +DEFINE_CLASS_1(gpio, am335x_gpio_driver, am335x_gpio_methods, + sizeof(struct ti_gpio_softc), ti_gpio_driver); +DRIVER_MODULE(am335x_gpio, simplebus, am335x_gpio_driver, am335x_gpio_devclass, + 0, 0); +MODULE_DEPEND(am335x_gpio, ti_sysc, 1, 1, 1); |