The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/at91/at91_ssc.c

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    1 /*-
    2  * Copyright (c) 2006 M. Warner Losh.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/9.0/sys/arm/at91/at91_ssc.c 185265 2008-11-25 00:13:26Z imp $");
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/bus.h>
   32 #include <sys/conf.h>
   33 #include <sys/kernel.h>
   34 #include <sys/lock.h>
   35 #include <sys/module.h>
   36 #include <sys/mutex.h>
   37 #include <sys/rman.h>
   38 #include <machine/bus.h>
   39 
   40 #include <arm/at91/at91_sscreg.h>
   41 
   42 struct at91_ssc_softc
   43 {
   44         device_t dev;                   /* Myself */
   45         void *intrhand;                 /* Interrupt handle */
   46         struct resource *irq_res;       /* IRQ resource */
   47         struct resource *mem_res;       /* Memory resource */
   48         struct mtx sc_mtx;              /* basically a perimeter lock */
   49         struct cdev *cdev;
   50         int flags;
   51 #define OPENED 1
   52 };
   53 
   54 static inline uint32_t
   55 RD4(struct at91_ssc_softc *sc, bus_size_t off)
   56 {
   57         return bus_read_4(sc->mem_res, off);
   58 }
   59 
   60 static inline void
   61 WR4(struct at91_ssc_softc *sc, bus_size_t off, uint32_t val)
   62 {
   63         bus_write_4(sc->mem_res, off, val);
   64 }
   65 
   66 #define AT91_SSC_LOCK(_sc)              mtx_lock(&(_sc)->sc_mtx)
   67 #define AT91_SSC_UNLOCK(_sc)            mtx_unlock(&(_sc)->sc_mtx)
   68 #define AT91_SSC_LOCK_INIT(_sc) \
   69         mtx_init(&(_sc)->sc_mtx, device_get_nameunit((_sc)->dev), \
   70             "ssc", MTX_DEF)
   71 #define AT91_SSC_LOCK_DESTROY(_sc)      mtx_destroy(&(_sc)->sc_mtx);
   72 #define AT91_SSC_ASSERT_LOCKED(_sc)     mtx_assert(&(_sc)->sc_mtx, MA_OWNED);
   73 #define AT91_SSC_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED);
   74 #define CDEV2SOFTC(dev)         ((dev)->si_drv1)
   75 
   76 static devclass_t at91_ssc_devclass;
   77 
   78 /* bus entry points */
   79 
   80 static int at91_ssc_probe(device_t dev);
   81 static int at91_ssc_attach(device_t dev);
   82 static int at91_ssc_detach(device_t dev);
   83 static void at91_ssc_intr(void *);
   84 
   85 /* helper routines */
   86 static int at91_ssc_activate(device_t dev);
   87 static void at91_ssc_deactivate(device_t dev);
   88 
   89 /* cdev routines */
   90 static d_open_t at91_ssc_open;
   91 static d_close_t at91_ssc_close;
   92 static d_read_t at91_ssc_read;
   93 static d_write_t at91_ssc_write;
   94 
   95 static struct cdevsw at91_ssc_cdevsw =
   96 {
   97         .d_version = D_VERSION,
   98         .d_open = at91_ssc_open,
   99         .d_close = at91_ssc_close,
  100         .d_read = at91_ssc_read,
  101         .d_write = at91_ssc_write,
  102 };
  103 
  104 static int
  105 at91_ssc_probe(device_t dev)
  106 {
  107         device_set_desc(dev, "SSC");
  108         return (0);
  109 }
  110 
  111 static int
  112 at91_ssc_attach(device_t dev)
  113 {
  114         struct at91_ssc_softc *sc = device_get_softc(dev);
  115         int err;
  116 
  117         sc->dev = dev;
  118         err = at91_ssc_activate(dev);
  119         if (err)
  120                 goto out;
  121 
  122         AT91_SSC_LOCK_INIT(sc);
  123 
  124         /*
  125          * Activate the interrupt
  126          */
  127         err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
  128             NULL, at91_ssc_intr, sc, &sc->intrhand);
  129         if (err) {
  130                 AT91_SSC_LOCK_DESTROY(sc);
  131                 goto out;
  132         }
  133         sc->cdev = make_dev(&at91_ssc_cdevsw, device_get_unit(dev), UID_ROOT,
  134             GID_WHEEL, 0600, "ssc%d", device_get_unit(dev));
  135         if (sc->cdev == NULL) {
  136                 err = ENOMEM;
  137                 goto out;
  138         }
  139         sc->cdev->si_drv1 = sc;
  140 
  141         // Init for TSC needs
  142         WR4(sc, SSC_CR, SSC_CR_SWRST);
  143         WR4(sc, SSC_CMR, 0);            // clock divider unused
  144         WR4(sc, SSC_RCMR,
  145             SSC_RCMR_CKS_RK | SSC_RCMR_CKO_NONE | SSC_RCMR_START_FALL_EDGE_RF);
  146         WR4(sc, SSC_RFMR,
  147             0x1f | SSC_RFMR_MSFBF | SSC_RFMR_FSOS_NONE);
  148         WR4(sc, SSC_TCMR,
  149             SSC_TCMR_CKS_TK | SSC_TCMR_CKO_NONE |  SSC_RCMR_START_CONT);
  150         WR4(sc, SSC_TFMR,
  151             0x1f | SSC_TFMR_DATDEF | SSC_TFMR_MSFBF | SSC_TFMR_FSOS_NEG_PULSE);
  152 
  153 out:;
  154         if (err)
  155                 at91_ssc_deactivate(dev);
  156         return (err);
  157 }
  158 
  159 static int
  160 at91_ssc_detach(device_t dev)
  161 {
  162         return (EBUSY); /* XXX */
  163 }
  164 
  165 static int
  166 at91_ssc_activate(device_t dev)
  167 {
  168         struct at91_ssc_softc *sc;
  169         int rid;
  170 
  171         sc = device_get_softc(dev);
  172         rid = 0;
  173         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
  174             RF_ACTIVE);
  175         if (sc->mem_res == NULL)
  176                 goto errout;
  177         rid = 0;
  178         sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
  179             RF_ACTIVE);
  180         if (sc->irq_res == NULL)
  181                 goto errout;
  182         return (0);
  183 errout:
  184         at91_ssc_deactivate(dev);
  185         return (ENOMEM);
  186 }
  187 
  188 static void
  189 at91_ssc_deactivate(device_t dev)
  190 {
  191         struct at91_ssc_softc *sc;
  192 
  193         sc = device_get_softc(dev);
  194         if (sc->intrhand)
  195                 bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
  196         sc->intrhand = 0;
  197         bus_generic_detach(sc->dev);
  198         if (sc->mem_res)
  199                 bus_release_resource(dev, SYS_RES_IOPORT,
  200                     rman_get_rid(sc->mem_res), sc->mem_res);
  201         sc->mem_res = 0;
  202         if (sc->irq_res)
  203                 bus_release_resource(dev, SYS_RES_IRQ,
  204                     rman_get_rid(sc->irq_res), sc->irq_res);
  205         sc->irq_res = 0;
  206         return;
  207 }
  208 
  209 static void
  210 at91_ssc_intr(void *xsc)
  211 {
  212         struct at91_ssc_softc *sc = xsc;
  213         wakeup(sc);
  214         return;
  215 }
  216 
  217 static int 
  218 at91_ssc_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
  219 {
  220         struct at91_ssc_softc *sc;
  221 
  222         sc = CDEV2SOFTC(dev);
  223         AT91_SSC_LOCK(sc);
  224         if (!(sc->flags & OPENED)) {
  225                 sc->flags |= OPENED;
  226         }
  227         AT91_SSC_UNLOCK(sc);
  228         return (0);
  229 }
  230 
  231 static int
  232 at91_ssc_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
  233 {
  234         struct at91_ssc_softc *sc;
  235 
  236         sc = CDEV2SOFTC(dev);
  237         AT91_SSC_LOCK(sc);
  238         sc->flags &= ~OPENED;
  239         AT91_SSC_UNLOCK(sc);
  240         return (0);
  241 }
  242 
  243 static int
  244 at91_ssc_read(struct cdev *dev, struct uio *uio, int flag)
  245 {
  246         return EIO;
  247 }
  248 
  249 static int
  250 at91_ssc_write(struct cdev *dev, struct uio *uio, int flag)
  251 {
  252         return EIO;
  253 }
  254 
  255 static device_method_t at91_ssc_methods[] = {
  256         /* Device interface */
  257         DEVMETHOD(device_probe,         at91_ssc_probe),
  258         DEVMETHOD(device_attach,        at91_ssc_attach),
  259         DEVMETHOD(device_detach,        at91_ssc_detach),
  260 
  261         { 0, 0 }
  262 };
  263 
  264 static driver_t at91_ssc_driver = {
  265         "at91_ssc",
  266         at91_ssc_methods,
  267         sizeof(struct at91_ssc_softc),
  268 };
  269 
  270 DRIVER_MODULE(at91_ssc, atmelarm, at91_ssc_driver, at91_ssc_devclass, 0, 0);

Cache object: c248dad4c6a4d965ec474e8c293a268b


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