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Date:      Sat, 16 Nov 2013 08:23:15 +0000 (UTC)
From:      Rui Paulo <rpaulo@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r258210 - head/sys/arm/ti
Message-ID:  <201311160823.rAG8NFDF012472@svn.freebsd.org>

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Author: rpaulo
Date: Sat Nov 16 08:23:15 2013
New Revision: 258210
URL: http://svnweb.freebsd.org/changeset/base/258210

Log:
  Add a driver for the TI Programmable Realtime Unit Subsystem.
  
  This is only a userland accessibility driver.  It mmaps the hardware region to
  userland and posts interrupt notifications via kqueue.

Added:
  head/sys/arm/ti/ti_pruss.c   (contents, props changed)
  head/sys/arm/ti/ti_pruss.h   (contents, props changed)

Added: head/sys/arm/ti/ti_pruss.c
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/sys/arm/ti/ti_pruss.c	Sat Nov 16 08:23:15 2013	(r258210)
@@ -0,0 +1,320 @@
+/*-
+ * Copyright (c) 2013 Rui Paulo <rpaulo@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 ``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/module.h>
+#include <sys/malloc.h>
+#include <sys/rman.h>
+#include <sys/event.h>
+#include <sys/selinfo.h>
+#include <machine/bus.h>
+#include <machine/cpu.h>
+#include <machine/frame.h>
+#include <machine/intr.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <arm/ti/ti_prcm.h>
+#include <arm/ti/ti_pruss.h>
+
+#define DEBUG
+#ifdef DEBUG
+#define	DPRINTF(fmt, ...)	do {	\
+	printf("%s: ", __func__);	\
+	printf(fmt, __VA_ARGS__);	\
+} while (0)
+#else
+#define	DPRINTF(fmt, ...)
+#endif
+
+static device_probe_t		ti_pruss_probe;
+static device_attach_t		ti_pruss_attach;
+static device_detach_t		ti_pruss_detach;
+static void			ti_pruss_intr(void *);
+static d_open_t			ti_pruss_open;
+static d_close_t		ti_pruss_close;
+static d_mmap_t			ti_pruss_mmap;
+static void 			ti_pruss_kq_read_detach(struct knote *);
+static int 			ti_pruss_kq_read_event(struct knote *, long);
+static d_kqfilter_t		ti_pruss_kqfilter;
+
+#define	TI_PRUSS_IRQS	8
+struct ti_pruss_softc {
+	struct mtx		sc_mtx;
+	struct resource 	*sc_mem_res;
+	struct resource 	*sc_irq_res[TI_PRUSS_IRQS];
+	void            	*sc_intr[TI_PRUSS_IRQS];
+	bus_space_tag_t		sc_bt;
+	bus_space_handle_t	sc_bh;
+	struct cdev		*sc_pdev;
+	struct selinfo		sc_selinfo;
+	uint32_t		sc_inuse;
+};
+
+static struct cdevsw ti_pruss_cdevsw = {
+	.d_version =	D_VERSION,
+	.d_name =	"ti_pruss",
+	.d_open =	ti_pruss_open,
+	.d_close =	ti_pruss_close,
+	.d_mmap =	ti_pruss_mmap,
+	.d_kqfilter =	ti_pruss_kqfilter,
+};
+
+static device_method_t ti_pruss_methods[] = {
+	DEVMETHOD(device_probe,		ti_pruss_probe),
+	DEVMETHOD(device_attach,	ti_pruss_attach),
+	DEVMETHOD(device_detach,	ti_pruss_detach),
+
+	DEVMETHOD_END
+};
+
+static driver_t ti_pruss_driver = {
+	"ti_pruss",
+	ti_pruss_methods,
+	sizeof(struct ti_pruss_softc)
+};
+
+static devclass_t ti_pruss_devclass;
+
+DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0);
+
+static struct resource_spec ti_pruss_irq_spec[] = {
+	{ SYS_RES_IRQ,	    0,  RF_ACTIVE },
+	{ SYS_RES_IRQ,	    1,  RF_ACTIVE },
+	{ SYS_RES_IRQ,	    2,  RF_ACTIVE },
+	{ SYS_RES_IRQ,	    3,  RF_ACTIVE },
+	{ SYS_RES_IRQ,	    4,  RF_ACTIVE },
+	{ SYS_RES_IRQ,	    5,  RF_ACTIVE },
+	{ SYS_RES_IRQ,	    6,  RF_ACTIVE },
+	{ SYS_RES_IRQ,	    7,  RF_ACTIVE },
+	{ -1,               0,  0 }
+};
+
+static struct ti_pruss_irq_arg {
+	int 		       irq;
+	struct ti_pruss_softc *sc;
+} ti_pruss_irq_args[TI_PRUSS_IRQS];
+
+static __inline uint32_t
+ti_pruss_reg_read(struct ti_pruss_softc *sc, uint32_t reg)
+{
+	return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
+}
+
+static __inline void
+ti_pruss_reg_write(struct ti_pruss_softc *sc, uint32_t reg, uint32_t val)
+{
+	bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
+}
+
+static int
+ti_pruss_probe(device_t dev)
+{
+	if (ofw_bus_is_compatible(dev, "ti,pruss-v1") ||
+	    ofw_bus_is_compatible(dev, "ti,pruss-v2")) {
+		device_set_desc(dev, "TI Programmable Realtime Unit Subsystem");
+		return (BUS_PROBE_DEFAULT);
+	}
+
+	return (ENXIO);
+}
+
+static int
+ti_pruss_attach(device_t dev)
+{
+	struct ti_pruss_softc *sc;
+	int rid, i;
+
+	if (ti_prcm_clk_enable(PRUSS_CLK) != 0) {
+		device_printf(dev, "could not enable PRUSS clock\n");
+		return (ENXIO);
+	}
+	sc = device_get_softc(dev);
+	rid = 0;
+	mtx_init(&sc->sc_mtx, "TI PRUSS", MTX_DEF, 0);
+	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
+	    RF_ACTIVE);
+	if (sc->sc_mem_res == NULL) {
+		device_printf(dev, "could not allocate memory resource\n");
+		return (ENXIO);
+	}
+	sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
+	sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
+	if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) {
+		device_printf(dev, "could not allocate interrupt resource\n");
+		ti_pruss_detach(dev);
+		return (ENXIO);
+	}
+	for (i = 0; i < TI_PRUSS_IRQS; i++) {
+		ti_pruss_irq_args[i].irq = i;
+		ti_pruss_irq_args[i].sc = sc;
+		if (bus_setup_intr(dev, sc->sc_irq_res[i], 
+		    INTR_MPSAFE | INTR_TYPE_MISC,
+		    NULL, ti_pruss_intr, &ti_pruss_irq_args[i], 
+		    &sc->sc_intr[i]) != 0) {
+			device_printf(dev, 
+			    "unable to setup the interrupt handler\n");
+			ti_pruss_detach(dev);
+			return (ENXIO);
+		}
+	}
+	if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV)
+		device_printf(dev, "AM18xx PRU-ICSS\n");
+	else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV)
+		device_printf(dev, "AM33xx PRU-ICSS\n");
+
+	sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL,
+	    0600, "pruss%d", device_get_unit(dev));
+	sc->sc_pdev->si_drv1 = dev;
+
+	return (0);
+}
+
+static int
+ti_pruss_detach(device_t dev)
+{
+	struct ti_pruss_softc *sc;
+	int i;
+
+	sc = device_get_softc(dev);
+	for (i = 0; i < TI_PRUSS_IRQS; i++) {
+		if (sc->sc_intr[i])
+			bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]);
+		if (sc->sc_irq_res[i])
+			bus_release_resource(dev, SYS_RES_IRQ, 
+			    rman_get_rid(sc->sc_irq_res[i]),
+			    sc->sc_irq_res[i]);
+	}
+	if (sc->sc_mem_res)
+		bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
+		    sc->sc_mem_res);
+	if (sc->sc_pdev)
+		destroy_dev(sc->sc_pdev);
+
+	return (0);
+}
+
+static void
+ti_pruss_intr(void *arg)
+{
+	struct ti_pruss_irq_arg *iap;
+	struct ti_pruss_softc *sc;
+
+	iap = arg;
+	sc = iap->sc;
+	DPRINTF("interrupt %p", sc);
+	KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, iap->irq);
+}
+
+static int
+ti_pruss_open(struct cdev *cdev, int oflags, int devtype, struct thread *td)
+{
+	device_t dev = cdev->si_drv1;
+	struct ti_pruss_softc *sc = device_get_softc(dev);
+
+	if (atomic_cmpset_32(&sc->sc_inuse, 0, 1) == 0)
+		return (EBUSY);
+	else
+		return (0);
+}
+
+static int
+ti_pruss_close(struct cdev *cdev, int fflag, int devtype, struct thread *td)
+{
+	device_t dev = cdev->si_drv1;
+	struct ti_pruss_softc *sc = device_get_softc(dev);
+
+	sc->sc_inuse = 0;
+
+	return (0);
+}
+
+static int
+ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
+    int nprot, vm_memattr_t *memattr)
+{
+	device_t dev = cdev->si_drv1;
+	struct ti_pruss_softc *sc = device_get_softc(dev);
+
+	if (offset > rman_get_size(sc->sc_mem_res))
+		return (-1);
+	*paddr = rman_get_start(sc->sc_mem_res) + offset;
+
+	return (0);
+}
+
+static struct filterops ti_pruss_kq_read = {
+	.f_isfd = 1,
+	.f_detach = ti_pruss_kq_read_detach,
+	.f_event = ti_pruss_kq_read_event,
+};
+
+static void
+ti_pruss_kq_read_detach(struct knote *kn)
+{
+	struct ti_pruss_softc *sc = kn->kn_hook;
+
+	knlist_remove(&sc->sc_selinfo.si_note, kn, 0);
+}
+
+static int
+ti_pruss_kq_read_event(struct knote *kn, long hint)
+{
+	kn->kn_data = hint;
+
+	return (hint);
+}
+
+static int
+ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn)
+{
+	device_t dev = cdev->si_drv1;
+	struct ti_pruss_softc *sc = device_get_softc(dev);
+
+	switch (kn->kn_filter) {
+	case EVFILT_READ:
+		kn->kn_hook = sc;
+		kn->kn_fop = &ti_pruss_kq_read;
+		knlist_add(&sc->sc_selinfo.si_note, kn, 1);
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	return (0);
+}

Added: head/sys/arm/ti/ti_pruss.h
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/sys/arm/ti/ti_pruss.h	Sat Nov 16 08:23:15 2013	(r258210)
@@ -0,0 +1,36 @@
+/*-
+ * Copyright (c) 2013 Rui Paulo <rpaulo@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 ``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 _TI_PRUSS_H_
+#define _TI_PRUSS_H_
+
+#define	PRUSS_AM18XX_INTC	0x04000
+#define	PRUSS_AM18XX_REV	0x4e825900
+#define	PRUSS_AM33XX_REV	0x4e82A900
+#define	PRUSS_AM33XX_INTC	0x20000
+
+#endif /* _TI_PRUSS_H_ */



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