svn commit: r258210 - head/sys/arm/ti
Rui Paulo
rpaulo at FreeBSD.org
Sat Nov 16 08:23:16 UTC 2013
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 at 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 at 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_ */
More information about the svn-src-all
mailing list