Hook up the five gpio pins on the Avila board to the gpio framework. There are

actually 16 I/O lines but the other ones are used for system devices and
interrupts.

The IXP4XX platform can set interrupts on these pins for
high/low/rising/falling/transitional but this is not implemented yet.

The Cambria has the same interface but as all the pins are assigned to system
functions the gpio header is toggled via a PLD on the i2c bus and is not
supported by this commit.

1 files changed, 380 insertions, 0 deletions

diff --git a/sys/arm/xscale/ixp425/avila_gpio.c b/sys/arm/xscale/ixp425/avila_gpio.c
new file mode 100644
index 0000000..82103a1
--- /dev/null
+++ b/sys/arm/xscale/ixp425/avila_gpio.c
@@ -0,0 +1,380 @@
+/*-
+ * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
+ * Copyright (c) 2009, Luiz Otavio O Souza.
+ * Copyright (c) 2010, Andrew Thompson <thompsa@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 unmodified, 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.
+ */
+
+/*
+ * GPIO driver for Gateworks Avilia
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/rman.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/gpio.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <arm/xscale/ixp425/ixp425reg.h>
+#include <arm/xscale/ixp425/ixp425var.h>
+
+#include "gpio_if.h"
+
+#define GPIO_SET_BITS(sc, reg, bits)	\
+	GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, (reg)) | (bits))
+
+#define GPIO_CLEAR_BITS(sc, reg, bits)	\
+	GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, (reg)) & ~(bits))
+
+#define GPIO_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
+#define GPIO_UNLOCK(_sc)	mtx_unlock(&(_sc)->sc_mtx)
+#define GPIO_LOCK_ASSERT(_sc)	mtx_assert(&(_sc)->sc_mtx, MA_OWNED)
+
+struct avila_gpio_softc {
+	device_t		sc_dev;
+        struct mtx		sc_mtx;
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_gpio_ioh;
+	uint32_t		sc_valid;
+	struct gpio_pin		sc_pins[IXP4XX_GPIO_PINS];
+};
+
+struct avila_gpio_pin {
+	const char *name;
+	int pin;
+	int caps;
+};
+
+#define	GPIO_PIN_IO	(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)
+static struct avila_gpio_pin avila_gpio_pins[] = {
+	{ "GPIO0", 0, GPIO_PIN_IO },
+	{ "GPIO1", 1, GPIO_PIN_IO },
+	{ "GPIO2", 2, GPIO_PIN_IO },
+	{ "GPIO3", 3, GPIO_PIN_IO },
+	{ "GPIO4", 4, GPIO_PIN_IO },
+	/*
+	 * The following pins are connected to system devices and should not
+	 * really be frobbed.
+	 */
+#if 0
+	{ "SER_ENA", 5, GPIO_PIN_IO },
+	{ "I2C_SCL", 6, GPIO_PIN_IO },
+	{ "I2C_SDA", 7, GPIO_PIN_IO },
+	{ "PCI_INTD", 8, GPIO_PIN_IO },
+	{ "PCI_INTC", 9, GPIO_PIN_IO },
+	{ "PCI_INTB", 10, GPIO_PIN_IO },
+	{ "PCI_INTA", 11, GPIO_PIN_IO },
+	{ "ATA_INT", 12, GPIO_PIN_IO },
+	{ "PCI_RST", 13, GPIO_PIN_IO },
+	{ "PCI_CLK", 14, GPIO_PIN_OUTPUT },
+	{ "EX_CLK", 15, GPIO_PIN_OUTPUT },
+#endif
+};
+#undef GPIO_PIN_IO
+
+/*
+ * Helpers
+ */
+static void avila_gpio_pin_configure(struct avila_gpio_softc *sc, 
+    struct gpio_pin *pin, uint32_t flags);
+static int  avila_gpio_pin_flags(struct avila_gpio_softc *sc, uint32_t pin);
+
+/*
+ * Driver stuff
+ */
+static int avila_gpio_probe(device_t dev);
+static int avila_gpio_attach(device_t dev);
+static int avila_gpio_detach(device_t dev);
+
+/*
+ * GPIO interface
+ */
+static int avila_gpio_pin_max(device_t dev, int *maxpin);
+static int avila_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps);
+static int avila_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t
+    *flags);
+static int avila_gpio_pin_getname(device_t dev, uint32_t pin, char *name);
+static int avila_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags);
+static int avila_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value);
+static int avila_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val);
+static int avila_gpio_pin_toggle(device_t dev, uint32_t pin);
+
+static int
+avila_gpio_pin_flags(struct avila_gpio_softc *sc, uint32_t pin)
+{
+	uint32_t v;
+
+	v = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR) & (1 << pin);
+
+	return (v ? GPIO_PIN_INPUT : GPIO_PIN_OUTPUT);
+}
+
+static void
+avila_gpio_pin_configure(struct avila_gpio_softc *sc, struct gpio_pin *pin,
+    unsigned int flags)
+{
+	uint32_t mask;
+
+	mask = 1 << pin->gp_pin;
+	GPIO_LOCK(sc);
+
+	/*
+	 * Manage input/output
+	 */
+	if (flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) {
+		pin->gp_flags &= ~(GPIO_PIN_INPUT|GPIO_PIN_OUTPUT);
+		if (flags & GPIO_PIN_OUTPUT) {
+			pin->gp_flags |= GPIO_PIN_OUTPUT;
+			GPIO_CLEAR_BITS(sc, IXP425_GPIO_GPOER, mask);
+		}
+		else {
+			pin->gp_flags |= GPIO_PIN_INPUT;
+			GPIO_SET_BITS(sc, IXP425_GPIO_GPOER, mask);
+		}
+	}
+
+	GPIO_UNLOCK(sc);
+}
+
+static int
+avila_gpio_pin_max(device_t dev, int *maxpin)
+{
+
+	*maxpin = IXP4XX_GPIO_PINS - 1;
+	return (0);
+}
+
+static int
+avila_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
+{
+	struct avila_gpio_softc *sc = device_get_softc(dev);
+
+	if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & (1 << pin)))
+		return (EINVAL);
+
+	GPIO_LOCK(sc);
+	*caps = sc->sc_pins[pin].gp_caps;
+	GPIO_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+avila_gpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
+{
+	struct avila_gpio_softc *sc = device_get_softc(dev);
+
+	if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & (1 << pin)))
+		return (EINVAL);
+
+	GPIO_LOCK(sc);
+	/* refresh since we do not own all the pins */
+	sc->sc_pins[pin].gp_flags = avila_gpio_pin_flags(sc, pin);
+	*flags = sc->sc_pins[pin].gp_flags;
+	GPIO_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+avila_gpio_pin_getname(device_t dev, uint32_t pin, char *name)
+{
+	struct avila_gpio_softc *sc = device_get_softc(dev);
+
+	if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & (1 << pin)))
+		return (EINVAL);
+
+	GPIO_LOCK(sc);
+	memcpy(name, sc->sc_pins[pin].gp_name, GPIOMAXNAME);
+	GPIO_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+avila_gpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
+{
+	struct avila_gpio_softc *sc = device_get_softc(dev);
+	uint32_t mask = 1 << pin;
+
+	if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & mask))
+		return (EINVAL);
+
+	/* Filter out unwanted flags */
+	if ((flags &= sc->sc_pins[pin].gp_caps) != flags)
+		return (EINVAL);
+
+	/* Can't mix input/output together */
+	if ((flags & (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT)) ==
+	    (GPIO_PIN_INPUT|GPIO_PIN_OUTPUT))
+		return (EINVAL);
+
+	avila_gpio_pin_configure(sc, &sc->sc_pins[pin], flags);
+	return (0);
+}
+
+static int
+avila_gpio_pin_set(device_t dev, uint32_t pin, unsigned int value)
+{
+	struct avila_gpio_softc *sc = device_get_softc(dev);
+	uint32_t mask = 1 << pin;
+
+	if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & mask))
+		return (EINVAL);
+
+	GPIO_LOCK(sc);
+	if (value)
+		GPIO_SET_BITS(sc, IXP425_GPIO_GPOUTR, mask);
+	else
+		GPIO_CLEAR_BITS(sc, IXP425_GPIO_GPOUTR, mask);
+	GPIO_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+avila_gpio_pin_get(device_t dev, uint32_t pin, unsigned int *val)
+{
+	struct avila_gpio_softc *sc = device_get_softc(dev);
+
+	if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & (1 << pin)))
+		return (EINVAL);
+
+	GPIO_LOCK(sc);
+	*val = (GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR) & (1 << pin)) ? 1 : 0;
+	GPIO_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+avila_gpio_pin_toggle(device_t dev, uint32_t pin)
+{
+	struct avila_gpio_softc *sc = device_get_softc(dev);
+	uint32_t mask = 1 << pin;
+	int res;
+
+	if (pin >= IXP4XX_GPIO_PINS || !(sc->sc_valid & mask))
+		return (EINVAL);
+
+	GPIO_LOCK(sc);
+	res = (GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR) & mask) ? 1 : 0;
+	if (res)
+		GPIO_CLEAR_BITS(sc, IXP425_GPIO_GPOUTR, mask);
+	else
+		GPIO_SET_BITS(sc, IXP425_GPIO_GPOUTR, mask);
+	GPIO_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+avila_gpio_probe(device_t dev)
+{
+
+	device_set_desc(dev, "Gateworks Avila GPIO driver");
+	return (0);
+}
+
+static int
+avila_gpio_attach(device_t dev)
+{
+#define	N(a)	(sizeof(a) / sizeof(a[0]))
+	struct avila_gpio_softc *sc = device_get_softc(dev);
+	struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
+	int i;
+
+	sc->sc_dev = dev;
+	sc->sc_iot = sa->sc_iot;
+	sc->sc_gpio_ioh = sa->sc_gpio_ioh;
+
+	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
+	    MTX_DEF);
+
+	for (i = 0; i < N(avila_gpio_pins); i++) {
+		struct avila_gpio_pin *p = &avila_gpio_pins[i];
+
+		strncpy(sc->sc_pins[p->pin].gp_name, p->name, GPIOMAXNAME);
+		sc->sc_pins[p->pin].gp_pin = p->pin;
+		sc->sc_pins[p->pin].gp_caps = p->caps;
+		sc->sc_pins[p->pin].gp_flags = avila_gpio_pin_flags(sc, p->pin);
+		sc->sc_valid |= 1 << p->pin;
+	}
+
+	device_add_child(dev, "gpioc", device_get_unit(dev));
+	device_add_child(dev, "gpiobus", device_get_unit(dev));
+	return (bus_generic_attach(dev));
+#undef N
+}
+
+static int
+avila_gpio_detach(device_t dev)
+{
+	struct avila_gpio_softc *sc = device_get_softc(dev);
+
+	KASSERT(mtx_initialized(&sc->sc_mtx), ("gpio mutex not initialized"));
+
+	bus_generic_detach(dev);
+
+	mtx_destroy(&sc->sc_mtx);
+
+	return(0);
+}
+
+static device_method_t gpio_avila_methods[] = {
+	DEVMETHOD(device_probe, avila_gpio_probe),
+	DEVMETHOD(device_attach, avila_gpio_attach),
+	DEVMETHOD(device_detach, avila_gpio_detach),
+
+	/* GPIO protocol */
+	DEVMETHOD(gpio_pin_max, avila_gpio_pin_max),
+	DEVMETHOD(gpio_pin_getname, avila_gpio_pin_getname),
+	DEVMETHOD(gpio_pin_getflags, avila_gpio_pin_getflags),
+	DEVMETHOD(gpio_pin_getcaps, avila_gpio_pin_getcaps),
+	DEVMETHOD(gpio_pin_setflags, avila_gpio_pin_setflags),
+	DEVMETHOD(gpio_pin_get, avila_gpio_pin_get),
+	DEVMETHOD(gpio_pin_set, avila_gpio_pin_set),
+	DEVMETHOD(gpio_pin_toggle, avila_gpio_pin_toggle),
+	{0, 0},
+};
+
+static driver_t gpio_avila_driver = {
+	"gpio_avila",
+	gpio_avila_methods,
+	sizeof(struct avila_gpio_softc),
+};
+static devclass_t gpio_avila_devclass;
+
+DRIVER_MODULE(gpio_avila, ixp, gpio_avila_driver, gpio_avila_devclass, 0, 0);