ti_mbox.c

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    1 /*-
    2  * Copyright (c) 2013 Rui Paulo <rpaulo@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   17  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
   18  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   20  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   22  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   23  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   24  * POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/10.2/sys/arm/ti/ti_mbox.c 266152 2014-05-15 16:11:06Z ian $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/bus.h>
   32 #include <sys/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/malloc.h>
   35 #include <sys/rman.h>
   36 #include <sys/timeet.h>
   37 #include <sys/timetc.h>
   38 #include <sys/watchdog.h>
   39 #include <machine/bus.h>
   40 #include <machine/cpu.h>
   41 #include <machine/frame.h>
   42 #include <machine/intr.h>
   43 
   44 #include <dev/fdt/fdt_common.h>
   45 #include <dev/ofw/openfirm.h>
   46 #include <dev/ofw/ofw_bus.h>
   47 #include <dev/ofw/ofw_bus_subr.h>
   48 
   49 #include <machine/bus.h>
   50 #include <machine/fdt.h>
   51 
   52 #include <arm/ti/ti_mbox.h>
   53 #include <arm/ti/ti_prcm.h>
   54 
   55 #include "mbox_if.h"
   56 
   57 #define DEBUG
   58 #ifdef DEBUG
   59 #define DPRINTF(fmt, ...)       do {    \
   60         printf("%s: ", __func__);       \
   61         printf(fmt, __VA_ARGS__);       \
   62 } while (0)
   63 #else
   64 #define DPRINTF(fmt, ...)
   65 #endif
   66 
   67 static device_probe_t           ti_mbox_probe;
   68 static device_attach_t          ti_mbox_attach;
   69 static device_detach_t          ti_mbox_detach;
   70 static void                     ti_mbox_intr(void *);
   71 static int                      ti_mbox_read(device_t, int, uint32_t *);
   72 static int                      ti_mbox_write(device_t, int, uint32_t);
   73 
   74 struct ti_mbox_softc {
   75         struct mtx              sc_mtx;
   76         struct resource         *sc_mem_res;
   77         struct resource         *sc_irq_res;
   78         void                    *sc_intr;
   79         bus_space_tag_t         sc_bt;
   80         bus_space_handle_t      sc_bh;
   81 };
   82 
   83 #define TI_MBOX_LOCK(sc)        mtx_lock(&(sc)->sc_mtx)
   84 #define TI_MBOX_UNLOCK(sc)      mtx_unlock(&(sc)->sc_mtx)
   85 
   86 static device_method_t ti_mbox_methods[] = {
   87         DEVMETHOD(device_probe,         ti_mbox_probe),
   88         DEVMETHOD(device_attach,        ti_mbox_attach),
   89         DEVMETHOD(device_detach,        ti_mbox_detach),
   90 
   91         DEVMETHOD(mbox_read,            ti_mbox_read),
   92         DEVMETHOD(mbox_write,           ti_mbox_write),
   93 
   94         DEVMETHOD_END
   95 };
   96 
   97 static driver_t ti_mbox_driver = {
   98         "ti_mbox",
   99         ti_mbox_methods,
  100         sizeof(struct ti_mbox_softc)
  101 };
  102 
  103 static devclass_t ti_mbox_devclass;
  104 
  105 DRIVER_MODULE(ti_mbox, simplebus, ti_mbox_driver, ti_mbox_devclass, 0, 0);
  106 
  107 static __inline uint32_t
  108 ti_mbox_reg_read(struct ti_mbox_softc *sc, uint16_t reg)
  109 {
  110         return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
  111 }
  112 
  113 static __inline void
  114 ti_mbox_reg_write(struct ti_mbox_softc *sc, uint16_t reg, uint32_t val)
  115 {
  116         bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
  117 }
  118 
  119 static int
  120 ti_mbox_probe(device_t dev)
  121 {
  122 
  123         if (!ofw_bus_status_okay(dev))
  124                 return (ENXIO);
  125 
  126         if (ofw_bus_is_compatible(dev, "ti,system-mbox")) {
  127                 device_set_desc(dev, "TI System Mailbox");
  128                 return (BUS_PROBE_DEFAULT);
  129         }
  130 
  131         return (ENXIO);
  132 }
  133 
  134 static int
  135 ti_mbox_attach(device_t dev)
  136 {
  137         struct ti_mbox_softc *sc;
  138         int rid, delay, chan;
  139         uint32_t rev, sysconfig;
  140 
  141         if (ti_prcm_clk_enable(MAILBOX0_CLK) != 0) {
  142                 device_printf(dev, "could not enable MBOX clock\n");
  143                 return (ENXIO);
  144         }
  145         sc = device_get_softc(dev);
  146         rid = 0;
  147         mtx_init(&sc->sc_mtx, "TI mbox", NULL, MTX_DEF);
  148         sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  149             RF_ACTIVE);
  150         if (sc->sc_mem_res == NULL) {
  151                 device_printf(dev, "could not allocate memory resource\n");
  152                 return (ENXIO);
  153         }
  154         sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
  155         sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
  156         rid = 0;
  157         sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
  158             RF_ACTIVE);
  159         if (sc->sc_irq_res == NULL) {
  160                 device_printf(dev, "could not allocate interrupt resource\n");
  161                 ti_mbox_detach(dev);
  162                 return (ENXIO);
  163         }
  164         if (bus_setup_intr(dev, sc->sc_irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
  165             NULL, ti_mbox_intr, sc, &sc->sc_intr) != 0) {
  166                 device_printf(dev, "unable to setup the interrupt handler\n");
  167                 ti_mbox_detach(dev);
  168                 return (ENXIO);
  169         }
  170         /*
  171          * Reset the controller.
  172          */
  173         sysconfig = ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG);
  174         DPRINTF("initial sysconfig %d\n", sysconfig);
  175         sysconfig |= TI_MBOX_SYSCONFIG_SOFTRST;
  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, TI_MBOX_REVISION);
  193         DPRINTF("rev %d\n", rev);
  194         device_printf(dev, "revision %d.%d\n", (rev >> 8) & 0x4, rev & 0x40);
  195         /*
  196          * Enable message interrupts.
  197          */
  198         for (chan = 0; chan < 8; chan++)
  199                 ti_mbox_reg_write(sc, TI_MBOX_IRQENABLE_SET(chan), 1);
  200 
  201         return (0);
  202 }
  203 
  204 static int
  205 ti_mbox_detach(device_t dev)
  206 {
  207         struct ti_mbox_softc *sc;
  208 
  209         sc = device_get_softc(dev);
  210         if (sc->sc_intr)
  211                 bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr);
  212         if (sc->sc_irq_res)
  213                 bus_release_resource(dev, SYS_RES_IRQ, rman_get_rid(sc->sc_irq_res),
  214                     sc->sc_irq_res);
  215         if (sc->sc_mem_res)
  216                 bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
  217                     sc->sc_mem_res);
  218 
  219         return (0);
  220 }
  221 
  222 static void
  223 ti_mbox_intr(void *arg)
  224 {
  225         struct ti_mbox_softc *sc;
  226 
  227         sc = arg;
  228         DPRINTF("interrupt %p", sc);
  229 }
  230 
  231 static int
  232 ti_mbox_read(device_t dev, int chan, uint32_t *data)
  233 {
  234         struct ti_mbox_softc *sc;
  235 
  236         if (chan < 0 || chan > 7)
  237                 return (EINVAL);
  238         sc = device_get_softc(dev);
  239 
  240         return (ti_mbox_reg_read(sc, TI_MBOX_MESSAGE(chan)));
  241 }
  242 
  243 static int
  244 ti_mbox_write(device_t dev, int chan, uint32_t data)
  245 {
  246         int limit = 500;
  247         struct ti_mbox_softc *sc;
  248 
  249         if (chan < 0 || chan > 7)
  250                 return (EINVAL);
  251         sc = device_get_softc(dev);
  252         TI_MBOX_LOCK(sc);
  253         /* XXX implement interrupt method */
  254         while (ti_mbox_reg_read(sc, TI_MBOX_FIFOSTATUS(chan)) == 1 && 
  255             limit--) {
  256                 DELAY(10);
  257         }
  258         if (limit == 0) {
  259                 device_printf(dev, "FIFOSTAUS%d stuck\n", chan);
  260                 TI_MBOX_UNLOCK(sc);
  261                 return (EAGAIN);
  262         }
  263         ti_mbox_reg_write(sc, TI_MBOX_MESSAGE(chan), data);
  264 
  265         return (0);
  266 }

Cache object: 52fe113a1ba86dab8b4e190962432f66

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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