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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