ti_mbox.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013 Rui Paulo <rpaulo@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   18  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   19  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
   20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   22  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   24  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   25  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   26  * POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/malloc.h>
   37 #include <sys/rman.h>
   38 #include <sys/timeet.h>
   39 #include <sys/timetc.h>
   40 #include <sys/watchdog.h>
   41 #include <machine/bus.h>
   42 #include <machine/cpu.h>
   43 #include <machine/frame.h>
   44 #include <machine/intr.h>
   45 
   46 #include <dev/ofw/openfirm.h>
   47 #include <dev/ofw/ofw_bus.h>
   48 #include <dev/ofw/ofw_bus_subr.h>
   49 
   50 #include <machine/bus.h>
   51 
   52 #include <arm/ti/ti_mbox.h>
   53 #include <arm/ti/ti_sysc.h>
   54 
   55 #include "mbox_if.h"
   56 
   57 #ifdef DEBUG
   58 #define DPRINTF(fmt, ...)       do {    \
   59         printf("%s: ", __func__);       \
   60         printf(fmt, __VA_ARGS__);       \
   61 } while (0)
   62 #else
   63 #define DPRINTF(fmt, ...)
   64 #endif
   65 
   66 static device_probe_t           ti_mbox_probe;
   67 static device_attach_t          ti_mbox_attach;
   68 static device_detach_t          ti_mbox_detach;
   69 static void                     ti_mbox_intr(void *);
   70 static int                      ti_mbox_read(device_t, int, uint32_t *);
   71 static int                      ti_mbox_write(device_t, int, uint32_t);
   72 
   73 struct ti_mbox_softc {
   74         struct mtx              sc_mtx;
   75         struct resource         *sc_mem_res;
   76         struct resource         *sc_irq_res;
   77         void                    *sc_intr;
   78         bus_space_tag_t         sc_bt;
   79         bus_space_handle_t      sc_bh;
   80 };
   81 
   82 #define TI_MBOX_LOCK(sc)        mtx_lock(&(sc)->sc_mtx)
   83 #define TI_MBOX_UNLOCK(sc)      mtx_unlock(&(sc)->sc_mtx)
   84 
   85 static device_method_t ti_mbox_methods[] = {
   86         DEVMETHOD(device_probe,         ti_mbox_probe),
   87         DEVMETHOD(device_attach,        ti_mbox_attach),
   88         DEVMETHOD(device_detach,        ti_mbox_detach),
   89 
   90         DEVMETHOD(mbox_read,            ti_mbox_read),
   91         DEVMETHOD(mbox_write,           ti_mbox_write),
   92 
   93         DEVMETHOD_END
   94 };
   95 
   96 static driver_t ti_mbox_driver = {
   97         "ti_mbox",
   98         ti_mbox_methods,
   99         sizeof(struct ti_mbox_softc)
  100 };
  101 
  102 DRIVER_MODULE(ti_mbox, simplebus, ti_mbox_driver, 0, 0);
  103 MODULE_DEPEND(ti_mbox, ti_sysc, 1, 1, 1);
  104 
  105 static __inline uint32_t
  106 ti_mbox_reg_read(struct ti_mbox_softc *sc, uint16_t reg)
  107 {
  108         return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
  109 }
  110 
  111 static __inline void
  112 ti_mbox_reg_write(struct ti_mbox_softc *sc, uint16_t reg, uint32_t val)
  113 {
  114         bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
  115 }
  116 
  117 static int
  118 ti_mbox_probe(device_t dev)
  119 {
  120 
  121         if (!ofw_bus_status_okay(dev))
  122                 return (ENXIO);
  123 
  124         if (ofw_bus_is_compatible(dev, "ti,omap4-mailbox")) {
  125                 device_set_desc(dev, "TI System Mailbox");
  126                 return (BUS_PROBE_DEFAULT);
  127         }
  128 
  129         return (ENXIO);
  130 }
  131 
  132 static int
  133 ti_mbox_attach(device_t dev)
  134 {
  135         struct ti_mbox_softc *sc;
  136         int rid, delay, chan;
  137         uint32_t rev, sysconfig;
  138 
  139         if (ti_sysc_clock_enable(device_get_parent(dev)) != 0) {
  140                 device_printf(dev, "could not enable MBOX clock\n");
  141                 return (ENXIO);
  142         }
  143 
  144         sc = device_get_softc(dev);
  145         rid = 0;
  146         mtx_init(&sc->sc_mtx, "TI mbox", NULL, MTX_DEF);
  147         sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  148             RF_ACTIVE);
  149         if (sc->sc_mem_res == NULL) {
  150                 device_printf(dev, "could not allocate memory resource\n");
  151                 return (ENXIO);
  152         }
  153         sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
  154         sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
  155         rid = 0;
  156         sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
  157             RF_ACTIVE);
  158         if (sc->sc_irq_res == NULL) {
  159                 device_printf(dev, "could not allocate interrupt resource\n");
  160                 ti_mbox_detach(dev);
  161                 return (ENXIO);
  162         }
  163         if (bus_setup_intr(dev, sc->sc_irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
  164             NULL, ti_mbox_intr, sc, &sc->sc_intr) != 0) {
  165                 device_printf(dev, "unable to setup the interrupt handler\n");
  166                 ti_mbox_detach(dev);
  167                 return (ENXIO);
  168         }
  169         /*
  170          * Reset the controller.
  171          */
  172         sysconfig = ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG);
  173         DPRINTF("initial sysconfig %d\n", sysconfig);
  174         sysconfig |= TI_MBOX_SYSCONFIG_SOFTRST;
  175         ti_mbox_reg_write(sc, TI_MBOX_SYSCONFIG, sysconfig);
  176         delay = 100;
  177         while (ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG) & 
  178             TI_MBOX_SYSCONFIG_SOFTRST) {
  179                 delay--;
  180                 DELAY(10);
  181         }
  182         if (delay == 0) {
  183                 device_printf(dev, "controller reset failed\n");
  184                 ti_mbox_detach(dev);
  185                 return (ENXIO);
  186         }
  187         /*
  188          * Enable smart idle mode.
  189          */
  190         ti_mbox_reg_write(sc, TI_MBOX_SYSCONFIG,
  191             ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG) | TI_MBOX_SYSCONFIG_SMARTIDLE);
  192         rev = ti_mbox_reg_read(sc,
  193             ti_sysc_get_rev_address_offset_host(device_get_parent(dev)));
  194         DPRINTF("rev %d\n", rev);
  195         device_printf(dev, "revision %d.%d\n", (rev >> 8) & 0x4, rev & 0x40);
  196         /*
  197          * Enable message interrupts.
  198          */
  199         for (chan = 0; chan < 8; chan++)
  200                 ti_mbox_reg_write(sc, TI_MBOX_IRQENABLE_SET(chan), 1);
  201 
  202         return (0);
  203 }
  204 
  205 static int
  206 ti_mbox_detach(device_t dev)
  207 {
  208         struct ti_mbox_softc *sc;
  209 
  210         sc = device_get_softc(dev);
  211         if (sc->sc_intr)
  212                 bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr);
  213         if (sc->sc_irq_res)
  214                 bus_release_resource(dev, SYS_RES_IRQ, rman_get_rid(sc->sc_irq_res),
  215                     sc->sc_irq_res);
  216         if (sc->sc_mem_res)
  217                 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
  218                     sc->sc_mem_res);
  219 
  220         return (0);
  221 }
  222 
  223 static void
  224 ti_mbox_intr(void *arg)
  225 {
  226         DPRINTF("interrupt %p", arg);
  227 }
  228 
  229 static int
  230 ti_mbox_read(device_t dev, int chan, uint32_t *data)
  231 {
  232         struct ti_mbox_softc *sc;
  233 
  234         if (chan < 0 || chan > 7)
  235                 return (EINVAL);
  236         sc = device_get_softc(dev);
  237 
  238         return (ti_mbox_reg_read(sc, TI_MBOX_MESSAGE(chan)));
  239 }
  240 
  241 static int
  242 ti_mbox_write(device_t dev, int chan, uint32_t data)
  243 {
  244         int limit = 500;
  245         struct ti_mbox_softc *sc;
  246 
  247         if (chan < 0 || chan > 7)
  248                 return (EINVAL);
  249         sc = device_get_softc(dev);
  250         TI_MBOX_LOCK(sc);
  251         /* XXX implement interrupt method */
  252         while (ti_mbox_reg_read(sc, TI_MBOX_FIFOSTATUS(chan)) == 1 && 
  253             limit--) {
  254                 DELAY(10);
  255         }
  256         if (limit == 0) {
  257                 device_printf(dev, "FIFOSTAUS%d stuck\n", chan);
  258                 TI_MBOX_UNLOCK(sc);
  259                 return (EAGAIN);
  260         }
  261         ti_mbox_reg_write(sc, TI_MBOX_MESSAGE(chan), data);
  262 
  263         return (0);
  264 }

Cache object: 40f4af3007e4e88978f7743dd5d42069

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FreeBSD/Linux Kernel Cross Reference sys/arm/ti/ti_mbox.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/ti_mbox.c