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.
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rpaulo
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0a2bec4401
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320
sys/arm/ti/ti_pruss.c
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320
sys/arm/ti/ti_pruss.c
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/*-
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* Copyright (c) 2013 Rui Paulo <rpaulo@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <sys/event.h>
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#include <sys/selinfo.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/frame.h>
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#include <machine/intr.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <machine/fdt.h>
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#include <arm/ti/ti_prcm.h>
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#include <arm/ti/ti_pruss.h>
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#define DEBUG
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#ifdef DEBUG
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#define DPRINTF(fmt, ...) do { \
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printf("%s: ", __func__); \
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printf(fmt, __VA_ARGS__); \
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} while (0)
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#else
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#define DPRINTF(fmt, ...)
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#endif
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static device_probe_t ti_pruss_probe;
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static device_attach_t ti_pruss_attach;
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static device_detach_t ti_pruss_detach;
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static void ti_pruss_intr(void *);
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static d_open_t ti_pruss_open;
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static d_close_t ti_pruss_close;
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static d_mmap_t ti_pruss_mmap;
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static void ti_pruss_kq_read_detach(struct knote *);
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static int ti_pruss_kq_read_event(struct knote *, long);
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static d_kqfilter_t ti_pruss_kqfilter;
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#define TI_PRUSS_IRQS 8
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struct ti_pruss_softc {
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struct mtx sc_mtx;
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struct resource *sc_mem_res;
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struct resource *sc_irq_res[TI_PRUSS_IRQS];
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void *sc_intr[TI_PRUSS_IRQS];
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bus_space_tag_t sc_bt;
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bus_space_handle_t sc_bh;
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struct cdev *sc_pdev;
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struct selinfo sc_selinfo;
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uint32_t sc_inuse;
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};
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static struct cdevsw ti_pruss_cdevsw = {
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.d_version = D_VERSION,
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.d_name = "ti_pruss",
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.d_open = ti_pruss_open,
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.d_close = ti_pruss_close,
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.d_mmap = ti_pruss_mmap,
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.d_kqfilter = ti_pruss_kqfilter,
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};
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static device_method_t ti_pruss_methods[] = {
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DEVMETHOD(device_probe, ti_pruss_probe),
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DEVMETHOD(device_attach, ti_pruss_attach),
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DEVMETHOD(device_detach, ti_pruss_detach),
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DEVMETHOD_END
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};
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static driver_t ti_pruss_driver = {
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"ti_pruss",
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ti_pruss_methods,
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sizeof(struct ti_pruss_softc)
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};
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static devclass_t ti_pruss_devclass;
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DRIVER_MODULE(ti_pruss, simplebus, ti_pruss_driver, ti_pruss_devclass, 0, 0);
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static struct resource_spec ti_pruss_irq_spec[] = {
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{ SYS_RES_IRQ, 0, RF_ACTIVE },
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{ SYS_RES_IRQ, 1, RF_ACTIVE },
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{ SYS_RES_IRQ, 2, RF_ACTIVE },
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{ SYS_RES_IRQ, 3, RF_ACTIVE },
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{ SYS_RES_IRQ, 4, RF_ACTIVE },
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{ SYS_RES_IRQ, 5, RF_ACTIVE },
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{ SYS_RES_IRQ, 6, RF_ACTIVE },
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{ SYS_RES_IRQ, 7, RF_ACTIVE },
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{ -1, 0, 0 }
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};
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static struct ti_pruss_irq_arg {
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int irq;
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struct ti_pruss_softc *sc;
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} ti_pruss_irq_args[TI_PRUSS_IRQS];
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static __inline uint32_t
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ti_pruss_reg_read(struct ti_pruss_softc *sc, uint32_t reg)
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{
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return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
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}
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static __inline void
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ti_pruss_reg_write(struct ti_pruss_softc *sc, uint32_t reg, uint32_t val)
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{
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bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
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}
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static int
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ti_pruss_probe(device_t dev)
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{
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if (ofw_bus_is_compatible(dev, "ti,pruss-v1") ||
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ofw_bus_is_compatible(dev, "ti,pruss-v2")) {
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device_set_desc(dev, "TI Programmable Realtime Unit Subsystem");
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return (BUS_PROBE_DEFAULT);
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}
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return (ENXIO);
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}
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static int
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ti_pruss_attach(device_t dev)
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{
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struct ti_pruss_softc *sc;
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int rid, i;
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if (ti_prcm_clk_enable(PRUSS_CLK) != 0) {
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device_printf(dev, "could not enable PRUSS clock\n");
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return (ENXIO);
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}
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sc = device_get_softc(dev);
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rid = 0;
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mtx_init(&sc->sc_mtx, "TI PRUSS", MTX_DEF, 0);
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sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (sc->sc_mem_res == NULL) {
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device_printf(dev, "could not allocate memory resource\n");
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return (ENXIO);
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}
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sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
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sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
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if (bus_alloc_resources(dev, ti_pruss_irq_spec, sc->sc_irq_res) != 0) {
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device_printf(dev, "could not allocate interrupt resource\n");
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ti_pruss_detach(dev);
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return (ENXIO);
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}
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for (i = 0; i < TI_PRUSS_IRQS; i++) {
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ti_pruss_irq_args[i].irq = i;
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ti_pruss_irq_args[i].sc = sc;
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if (bus_setup_intr(dev, sc->sc_irq_res[i],
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INTR_MPSAFE | INTR_TYPE_MISC,
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NULL, ti_pruss_intr, &ti_pruss_irq_args[i],
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&sc->sc_intr[i]) != 0) {
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device_printf(dev,
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"unable to setup the interrupt handler\n");
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ti_pruss_detach(dev);
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return (ENXIO);
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}
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}
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if (ti_pruss_reg_read(sc, PRUSS_AM18XX_INTC) == PRUSS_AM18XX_REV)
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device_printf(dev, "AM18xx PRU-ICSS\n");
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else if (ti_pruss_reg_read(sc, PRUSS_AM33XX_INTC) == PRUSS_AM33XX_REV)
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device_printf(dev, "AM33xx PRU-ICSS\n");
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sc->sc_pdev = make_dev(&ti_pruss_cdevsw, 0, UID_ROOT, GID_WHEEL,
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0600, "pruss%d", device_get_unit(dev));
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sc->sc_pdev->si_drv1 = dev;
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return (0);
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}
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static int
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ti_pruss_detach(device_t dev)
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{
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struct ti_pruss_softc *sc;
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int i;
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sc = device_get_softc(dev);
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for (i = 0; i < TI_PRUSS_IRQS; i++) {
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if (sc->sc_intr[i])
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bus_teardown_intr(dev, sc->sc_irq_res[i], sc->sc_intr[i]);
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if (sc->sc_irq_res[i])
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bus_release_resource(dev, SYS_RES_IRQ,
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rman_get_rid(sc->sc_irq_res[i]),
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sc->sc_irq_res[i]);
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}
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if (sc->sc_mem_res)
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bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
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sc->sc_mem_res);
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if (sc->sc_pdev)
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destroy_dev(sc->sc_pdev);
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return (0);
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}
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static void
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ti_pruss_intr(void *arg)
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{
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struct ti_pruss_irq_arg *iap;
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struct ti_pruss_softc *sc;
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iap = arg;
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sc = iap->sc;
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DPRINTF("interrupt %p", sc);
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KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, iap->irq);
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}
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static int
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ti_pruss_open(struct cdev *cdev, int oflags, int devtype, struct thread *td)
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{
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device_t dev = cdev->si_drv1;
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struct ti_pruss_softc *sc = device_get_softc(dev);
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if (atomic_cmpset_32(&sc->sc_inuse, 0, 1) == 0)
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return (EBUSY);
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else
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return (0);
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}
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static int
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ti_pruss_close(struct cdev *cdev, int fflag, int devtype, struct thread *td)
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{
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device_t dev = cdev->si_drv1;
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struct ti_pruss_softc *sc = device_get_softc(dev);
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sc->sc_inuse = 0;
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return (0);
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}
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static int
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ti_pruss_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
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int nprot, vm_memattr_t *memattr)
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{
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device_t dev = cdev->si_drv1;
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struct ti_pruss_softc *sc = device_get_softc(dev);
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if (offset > rman_get_size(sc->sc_mem_res))
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return (-1);
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*paddr = rman_get_start(sc->sc_mem_res) + offset;
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return (0);
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}
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static struct filterops ti_pruss_kq_read = {
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.f_isfd = 1,
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.f_detach = ti_pruss_kq_read_detach,
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.f_event = ti_pruss_kq_read_event,
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};
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static void
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ti_pruss_kq_read_detach(struct knote *kn)
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{
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struct ti_pruss_softc *sc = kn->kn_hook;
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knlist_remove(&sc->sc_selinfo.si_note, kn, 0);
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}
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static int
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ti_pruss_kq_read_event(struct knote *kn, long hint)
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{
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kn->kn_data = hint;
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return (hint);
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}
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static int
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ti_pruss_kqfilter(struct cdev *cdev, struct knote *kn)
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{
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device_t dev = cdev->si_drv1;
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struct ti_pruss_softc *sc = device_get_softc(dev);
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switch (kn->kn_filter) {
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case EVFILT_READ:
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kn->kn_hook = sc;
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kn->kn_fop = &ti_pruss_kq_read;
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knlist_add(&sc->sc_selinfo.si_note, kn, 1);
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break;
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default:
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return (EINVAL);
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}
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return (0);
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}
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36
sys/arm/ti/ti_pruss.h
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36
sys/arm/ti/ti_pruss.h
Normal file
@ -0,0 +1,36 @@
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/*-
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* Copyright (c) 2013 Rui Paulo <rpaulo@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _TI_PRUSS_H_
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#define _TI_PRUSS_H_
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#define PRUSS_AM18XX_INTC 0x04000
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#define PRUSS_AM18XX_REV 0x4e825900
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#define PRUSS_AM33XX_REV 0x4e82A900
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#define PRUSS_AM33XX_INTC 0x20000
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#endif /* _TI_PRUSS_H_ */
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