264 lines
6.7 KiB
C
264 lines
6.7 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/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/timeet.h>
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#include <sys/timetc.h>
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#include <sys/watchdog.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/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 <arm/ti/ti_mbox.h>
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#include <arm/ti/ti_prcm.h>
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#include "mbox_if.h"
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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_mbox_probe;
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static device_attach_t ti_mbox_attach;
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static device_detach_t ti_mbox_detach;
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static void ti_mbox_intr(void *);
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static int ti_mbox_read(device_t, int, uint32_t *);
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static int ti_mbox_write(device_t, int, uint32_t);
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struct ti_mbox_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;
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void *sc_intr;
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bus_space_tag_t sc_bt;
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bus_space_handle_t sc_bh;
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};
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#define TI_MBOX_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
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#define TI_MBOX_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
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static device_method_t ti_mbox_methods[] = {
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DEVMETHOD(device_probe, ti_mbox_probe),
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DEVMETHOD(device_attach, ti_mbox_attach),
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DEVMETHOD(device_detach, ti_mbox_detach),
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DEVMETHOD(mbox_read, ti_mbox_read),
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DEVMETHOD(mbox_write, ti_mbox_write),
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DEVMETHOD_END
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};
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static driver_t ti_mbox_driver = {
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"ti_mbox",
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ti_mbox_methods,
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sizeof(struct ti_mbox_softc)
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};
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static devclass_t ti_mbox_devclass;
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DRIVER_MODULE(ti_mbox, simplebus, ti_mbox_driver, ti_mbox_devclass, 0, 0);
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static __inline uint32_t
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ti_mbox_reg_read(struct ti_mbox_softc *sc, uint16_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_mbox_reg_write(struct ti_mbox_softc *sc, uint16_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_mbox_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,omap4-mailbox")) {
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device_set_desc(dev, "TI System Mailbox");
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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_mbox_attach(device_t dev)
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{
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struct ti_mbox_softc *sc;
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int rid, delay, chan;
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uint32_t rev, sysconfig;
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if (ti_prcm_clk_enable(MAILBOX0_CLK) != 0) {
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device_printf(dev, "could not enable MBOX 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 mbox", 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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rid = 0;
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sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
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RF_ACTIVE);
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if (sc->sc_irq_res == NULL) {
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device_printf(dev, "could not allocate interrupt resource\n");
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ti_mbox_detach(dev);
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return (ENXIO);
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}
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if (bus_setup_intr(dev, sc->sc_irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
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NULL, ti_mbox_intr, sc, &sc->sc_intr) != 0) {
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device_printf(dev, "unable to setup the interrupt handler\n");
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ti_mbox_detach(dev);
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return (ENXIO);
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}
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/*
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* Reset the controller.
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*/
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sysconfig = ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG);
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DPRINTF("initial sysconfig %d\n", sysconfig);
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sysconfig |= TI_MBOX_SYSCONFIG_SOFTRST;
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delay = 100;
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while (ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG) &
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TI_MBOX_SYSCONFIG_SOFTRST) {
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delay--;
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DELAY(10);
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}
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if (delay == 0) {
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device_printf(dev, "controller reset failed\n");
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ti_mbox_detach(dev);
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return (ENXIO);
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}
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/*
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* Enable smart idle mode.
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*/
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ti_mbox_reg_write(sc, TI_MBOX_SYSCONFIG,
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ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG) | TI_MBOX_SYSCONFIG_SMARTIDLE);
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rev = ti_mbox_reg_read(sc, TI_MBOX_REVISION);
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DPRINTF("rev %d\n", rev);
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device_printf(dev, "revision %d.%d\n", (rev >> 8) & 0x4, rev & 0x40);
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/*
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* Enable message interrupts.
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*/
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for (chan = 0; chan < 8; chan++)
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ti_mbox_reg_write(sc, TI_MBOX_IRQENABLE_SET(chan), 1);
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return (0);
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}
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static int
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ti_mbox_detach(device_t dev)
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{
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struct ti_mbox_softc *sc;
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sc = device_get_softc(dev);
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if (sc->sc_intr)
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bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr);
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if (sc->sc_irq_res)
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bus_release_resource(dev, SYS_RES_IRQ, rman_get_rid(sc->sc_irq_res),
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sc->sc_irq_res);
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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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return (0);
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}
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static void
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ti_mbox_intr(void *arg)
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{
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struct ti_mbox_softc *sc;
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sc = arg;
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DPRINTF("interrupt %p", sc);
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}
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static int
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ti_mbox_read(device_t dev, int chan, uint32_t *data)
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{
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struct ti_mbox_softc *sc;
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if (chan < 0 || chan > 7)
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return (EINVAL);
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sc = device_get_softc(dev);
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return (ti_mbox_reg_read(sc, TI_MBOX_MESSAGE(chan)));
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}
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static int
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ti_mbox_write(device_t dev, int chan, uint32_t data)
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{
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int limit = 500;
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struct ti_mbox_softc *sc;
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if (chan < 0 || chan > 7)
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return (EINVAL);
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sc = device_get_softc(dev);
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TI_MBOX_LOCK(sc);
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/* XXX implement interrupt method */
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while (ti_mbox_reg_read(sc, TI_MBOX_FIFOSTATUS(chan)) == 1 &&
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limit--) {
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DELAY(10);
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}
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if (limit == 0) {
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device_printf(dev, "FIFOSTAUS%d stuck\n", chan);
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TI_MBOX_UNLOCK(sc);
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return (EAGAIN);
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}
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ti_mbox_reg_write(sc, TI_MBOX_MESSAGE(chan), data);
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return (0);
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}
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