am335x display drivers: Import from FreeBSD

1 files changed, 202 insertions, 0 deletions

diff --git a/freebsd/sys/arm/ti/am335x/am335x_ecap.c b/freebsd/sys/arm/ti/am335x/am335x_ecap.c
new file mode 100644
index 00000000..9ebc51db
--- /dev/null
+++ b/freebsd/sys/arm/ti/am335x/am335x_ecap.c
@@ -0,0 +1,202 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@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/bus.h>
+#include <sys/kernel.h>
+#include <sys/limits.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <rtems/bsd/sys/resource.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+
+#include <machine/bus.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "am335x_pwm.h"
+
+#define	ECAP_TSCTR		0x00
+#define	ECAP_CAP1		0x08
+#define	ECAP_CAP2		0x0C
+#define	ECAP_CAP3		0x10
+#define	ECAP_CAP4		0x14
+#define	ECAP_ECCTL2		0x2A
+#define		ECCTL2_MODE_APWM		(1 << 9)
+#define		ECCTL2_SYNCO_SEL		(3 << 6)
+#define		ECCTL2_TSCTRSTOP_FREERUN	(1 << 4)
+
+#define	ECAP_READ2(_sc, reg)	bus_read_2((_sc)->sc_mem_res, reg);
+#define	ECAP_WRITE2(_sc, reg, value)	\
+    bus_write_2((_sc)->sc_mem_res, reg, value);
+#define	ECAP_READ4(_sc, reg)	bus_read_4((_sc)->sc_mem_res, reg);
+#define	ECAP_WRITE4(_sc, reg, value)	\
+    bus_write_4((_sc)->sc_mem_res, reg, value);
+
+#define	PWM_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
+#define	PWM_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
+#define	PWM_LOCK_INIT(_sc)	mtx_init(&(_sc)->sc_mtx, \
+    device_get_nameunit(_sc->sc_dev), "am335x_ecap softc", MTX_DEF)
+#define	PWM_LOCK_DESTROY(_sc)	mtx_destroy(&(_sc)->sc_mtx)
+
+static device_probe_t am335x_ecap_probe;
+static device_attach_t am335x_ecap_attach;
+static device_detach_t am335x_ecap_detach;
+
+struct am335x_ecap_softc {
+	device_t		sc_dev;
+	struct mtx		sc_mtx;
+	struct resource		*sc_mem_res;
+	int			sc_mem_rid;
+};
+
+static device_method_t am335x_ecap_methods[] = {
+	DEVMETHOD(device_probe,		am335x_ecap_probe),
+	DEVMETHOD(device_attach,	am335x_ecap_attach),
+	DEVMETHOD(device_detach,	am335x_ecap_detach),
+
+	DEVMETHOD_END
+};
+
+static driver_t am335x_ecap_driver = {
+	"am335x_ecap",
+	am335x_ecap_methods,
+	sizeof(struct am335x_ecap_softc),
+};
+
+static devclass_t am335x_ecap_devclass;
+
+/*
+ * API function to set period/duty cycles for ECAPx
+ */
+int
+am335x_pwm_config_ecap(int unit, int period, int duty)
+{
+	device_t dev;
+	struct am335x_ecap_softc *sc;
+	uint16_t reg;
+
+	dev = devclass_get_device(am335x_ecap_devclass, unit);
+	if (dev == NULL)
+		return (ENXIO);
+
+	if (duty > period)
+		return (EINVAL);
+
+	if (period == 0)
+		return (EINVAL);
+
+	sc = device_get_softc(dev);
+	PWM_LOCK(sc);
+
+	reg = ECAP_READ2(sc, ECAP_ECCTL2);
+	reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL;
+	ECAP_WRITE2(sc, ECAP_ECCTL2, reg);
+
+	/* CAP3 in APWM mode is APRD shadow register */
+	ECAP_WRITE4(sc, ECAP_CAP3, period - 1);
+
+	/* CAP4 in APWM mode is ACMP shadow register */
+	ECAP_WRITE4(sc, ECAP_CAP4, duty);
+	/* Restart counter */
+	ECAP_WRITE4(sc, ECAP_TSCTR, 0);
+
+	PWM_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+am335x_ecap_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_is_compatible(dev, "ti,am33xx-ecap"))
+		return (ENXIO);
+
+	device_set_desc(dev, "AM335x eCAP");
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+am335x_ecap_attach(device_t dev)
+{
+	struct am335x_ecap_softc *sc;
+
+	sc = device_get_softc(dev);
+	sc->sc_dev = dev;
+
+	PWM_LOCK_INIT(sc);
+
+	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
+	    &sc->sc_mem_rid, RF_ACTIVE);
+	if (sc->sc_mem_res == NULL) {
+		device_printf(dev, "cannot allocate memory resources\n");
+		goto fail;
+	}
+
+	return (0);
+
+fail:
+	PWM_LOCK_DESTROY(sc);
+	return (ENXIO);
+}
+
+static int
+am335x_ecap_detach(device_t dev)
+{
+	struct am335x_ecap_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	PWM_LOCK(sc);
+	if (sc->sc_mem_res)
+		bus_release_resource(dev, SYS_RES_MEMORY,
+		    sc->sc_mem_rid, sc->sc_mem_res);
+	PWM_UNLOCK(sc);
+
+	PWM_LOCK_DESTROY(sc);
+
+
+	return (0);
+}
+
+DRIVER_MODULE(am335x_ecap, am335x_pwmss, am335x_ecap_driver, am335x_ecap_devclass, 0, 0);
+MODULE_VERSION(am335x_ecap, 1);
+MODULE_DEPEND(am335x_ecap, am335x_pwmss, 1, 1, 1);