Skeleton support for the SSC device, which implements I2S interfaces,

amoung others.

2 files changed, 297 insertions, 0 deletions

diff --git a/sys/arm/at91/at91_ssc.c b/sys/arm/at91/at91_ssc.c
new file mode 100644
index 0000000..1d012fb
--- /dev/null
+++ b/sys/arm/at91/at91_ssc.c
@@ -0,0 +1,267 @@
+/*-
+ * Copyright (c) 2006 M. Warner Losh.  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 ``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 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/conf.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/mbuf.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/rman.h>
+#include <machine/bus.h>
+
+#include <arm/at91/at91_sscreg.h>
+
+struct at91_ssc_softc
+{
+	device_t dev;			/* Myself */
+	void *intrhand;			/* Interrupt handle */
+	struct resource *irq_res;	/* IRQ resource */
+	struct resource	*mem_res;	/* Memory resource */
+	struct mtx sc_mtx;		/* basically a perimeter lock */
+	struct cdev *cdev;
+	int flags;
+#define OPENED 1
+};
+
+static inline uint32_t
+RD4(struct at91_ssc_softc *sc, bus_size_t off)
+{
+	return bus_read_4(sc->mem_res, off);
+}
+
+static inline void
+WR4(struct at91_ssc_softc *sc, bus_size_t off, uint32_t val)
+{
+	bus_write_4(sc->mem_res, off, val);
+}
+
+#define AT91_SSC_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
+#define	AT91_SSC_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
+#define AT91_SSC_LOCK_INIT(_sc) \
+	mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
+	    "ssc", MTX_DEF)
+#define AT91_SSC_LOCK_DESTROY(_sc)	mtx_destroy(&_sc->sc_mtx);
+#define AT91_SSC_ASSERT_LOCKED(_sc)	mtx_assert(&_sc->sc_mtx, MA_OWNED);
+#define AT91_SSC_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
+#define CDEV2SOFTC(dev)		((dev)->si_drv1)
+
+static devclass_t at91_ssc_devclass;
+
+/* bus entry points */
+
+static int at91_ssc_probe(device_t dev);
+static int at91_ssc_attach(device_t dev);
+static int at91_ssc_detach(device_t dev);
+static void at91_ssc_intr(void *);
+
+/* helper routines */
+static int at91_ssc_activate(device_t dev);
+static void at91_ssc_deactivate(device_t dev);
+
+/* cdev routines */
+static d_open_t at91_ssc_open;
+static d_close_t at91_ssc_close;
+static d_ioctl_t at91_ssc_ioctl;
+
+static struct cdevsw at91_ssc_cdevsw =
+{
+	.d_version = D_VERSION,
+	.d_open = at91_ssc_open,
+	.d_close = at91_ssc_close,
+	.d_ioctl = at91_ssc_ioctl
+};
+
+static int
+at91_ssc_probe(device_t dev)
+{
+	device_set_desc(dev, "SSC");
+	return (0);
+}
+
+static int
+at91_ssc_attach(device_t dev)
+{
+	struct at91_ssc_softc *sc = device_get_softc(dev);
+	int err;
+
+	sc->dev = dev;
+	err = at91_ssc_activate(dev);
+	if (err)
+		goto out;
+
+	AT91_SSC_LOCK_INIT(sc);
+
+	/*
+	 * Activate the interrupt
+	 */
+	err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
+	    at91_ssc_intr, sc, &sc->intrhand);
+	if (err) {
+		AT91_SSC_LOCK_DESTROY(sc);
+		goto out;
+	}
+	sc->cdev = make_dev(&at91_ssc_cdevsw, device_get_unit(dev), UID_ROOT,
+	    GID_WHEEL, 0600, "ssc%d", device_get_unit(dev));
+	if (sc->cdev == NULL) {
+		err = ENOMEM;
+		goto out;
+	}
+	sc->cdev->si_drv1 = sc;
+out:;
+	if (err)
+		at91_ssc_deactivate(dev);
+	return (err);
+}
+
+static int
+at91_ssc_detach(device_t dev)
+{
+	return (EBUSY);	/* XXX */
+}
+
+static int
+at91_ssc_activate(device_t dev)
+{
+	struct at91_ssc_softc *sc;
+	int rid;
+
+	sc = device_get_softc(dev);
+	rid = 0;
+	sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
+	    RF_ACTIVE);
+	if (sc->mem_res == NULL)
+		goto errout;
+	rid = 0;
+	sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
+	    RF_ACTIVE);
+	if (sc->mem_res == NULL)
+		goto errout;
+	return (0);
+errout:
+	at91_ssc_deactivate(dev);
+	return (ENOMEM);
+}
+
+static void
+at91_ssc_deactivate(device_t dev)
+{
+	struct at91_ssc_softc *sc;
+
+	sc = device_get_softc(dev);
+	if (sc->intrhand)
+		bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
+	sc->intrhand = 0;
+	bus_generic_detach(sc->dev);
+	if (sc->mem_res)
+		bus_release_resource(dev, SYS_RES_IOPORT,
+		    rman_get_rid(sc->mem_res), sc->mem_res);
+	sc->mem_res = 0;
+	if (sc->irq_res)
+		bus_release_resource(dev, SYS_RES_IRQ,
+		    rman_get_rid(sc->irq_res), sc->irq_res);
+	sc->irq_res = 0;
+	return;
+}
+
+static void
+at91_ssc_intr(void *xsc)
+{
+	struct at91_ssc_softc *sc = xsc;
+#if 0
+	uint32_t status;
+
+	/* Reading the status also clears the interrupt */
+	status = RD4(sc, SSC_SR);
+	if (status == 0)
+		return;
+	AT91_SSC_LOCK(sc);
+	AT91_SSC_UNLOCK(sc);
+#endif
+	wakeup(sc);
+	return;
+}
+
+static int 
+at91_ssc_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
+{
+	struct at91_ssc_softc *sc;
+
+	sc = CDEV2SOFTC(dev);
+	AT91_SSC_LOCK(sc);
+	if (!(sc->flags & OPENED)) {
+		sc->flags |= OPENED;
+#if 0
+	// Enable interrupts
+#endif
+	}
+	AT91_SSC_UNLOCK(sc);
+    	return (0);
+}
+
+static int
+at91_ssc_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
+{
+	struct at91_ssc_softc *sc;
+
+	sc = CDEV2SOFTC(dev);
+	AT91_SSC_LOCK(sc);
+	sc->flags &= ~OPENED;
+#if 0
+	// Disable interrupts
+#endif
+	AT91_SSC_UNLOCK(sc);
+	return (0);
+}
+
+static int
+at91_ssc_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
+    struct thread *td)
+{
+	return (ENXIO);
+}
+
+static device_method_t at91_ssc_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		at91_ssc_probe),
+	DEVMETHOD(device_attach,	at91_ssc_attach),
+	DEVMETHOD(device_detach,	at91_ssc_detach),
+
+	{ 0, 0 }
+};
+
+static driver_t at91_ssc_driver = {
+	"at91_ssc",
+	at91_ssc_methods,
+	sizeof(struct at91_ssc_softc),
+};
+
+DRIVER_MODULE(at91_ssc, atmelarm, at91_ssc_driver, at91_ssc_devclass, 0, 0);
diff --git a/sys/arm/at91/at91_sscreg.h b/sys/arm/at91/at91_sscreg.h
new file mode 100644
index 0000000..9768b00
--- /dev/null
+++ b/sys/arm/at91/at91_sscreg.h
@@ -0,0 +1,30 @@
+/*-
+ * Copyright (c) 2006 M. Warner Losh.  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 ``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 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.
+ */
+
+/* $FreeBSD$ */
+
+#ifndef ARM_AT91_AT91_SSCREG_H
+#define ARM_AT91_AT91_SSCREG_H
+
+#endif /* ARM_AT91_AT91_SSCREG_H */