71d90c04a8
to check the status property in their probe routines. Simplebus used to only instantiate its children whose status="okay" but that was improper behavior, fixed in r261352. Now that it doesn't check anymore and probes all its children; the children all have to do the check because really only the children know how to properly interpret their status property strings. Right now all existing drivers only understand "okay" versus something- that's-not-okay, so they all use the new ofw_bus_status_okay() helper.
325 lines
8.3 KiB
C
325 lines
8.3 KiB
C
/*-
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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_status_okay(dev))
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return (ENXIO);
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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", NULL, MTX_DEF);
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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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