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

     /*-
      * Copyright (c) 2006 M. Warner Losh.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
      * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/7.3/sys/arm/at91/at91_ssc.c 166901 2007-02-23 12:19:07Z piso $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/module.h>
    #include <sys/mutex.h>
    #include <sys/rman.h>
    #include <machine/bus.h>
    
    #include <arm/at91/at91_sscreg.h>
    
    struct at91_ssc_softc
    {
            device_t dev;                   /* Myself */
            void *intrhand;                 /* Interrupt handle */
            struct resource *irq_res;       /* IRQ resource */
            struct resource *mem_res;       /* Memory resource */
            struct mtx sc_mtx;              /* basically a perimeter lock */
            struct cdev *cdev;
            int flags;
    #define OPENED 1
    };
    
    static inline uint32_t
    RD4(struct at91_ssc_softc *sc, bus_size_t off)
    {
            return bus_read_4(sc->mem_res, off);
    }
    
    static inline void
    WR4(struct at91_ssc_softc *sc, bus_size_t off, uint32_t val)
    {
            bus_write_4(sc->mem_res, off, val);
    }
    
    #define AT91_SSC_LOCK(_sc)              mtx_lock(&(_sc)->sc_mtx)
    #define AT91_SSC_UNLOCK(_sc)            mtx_unlock(&(_sc)->sc_mtx)
    #define AT91_SSC_LOCK_INIT(_sc) \
            mtx_init(&(_sc)->sc_mtx, device_get_nameunit((_sc)->dev), \
                "ssc", MTX_DEF)
    #define AT91_SSC_LOCK_DESTROY(_sc)      mtx_destroy(&(_sc)->sc_mtx);
    #define AT91_SSC_ASSERT_LOCKED(_sc)     mtx_assert(&(_sc)->sc_mtx, MA_OWNED);
    #define AT91_SSC_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED);
    #define CDEV2SOFTC(dev)         ((dev)->si_drv1)
    
    static devclass_t at91_ssc_devclass;
    
    /* bus entry points */
    
    static int at91_ssc_probe(device_t dev);
    static int at91_ssc_attach(device_t dev);
    static int at91_ssc_detach(device_t dev);
    static void at91_ssc_intr(void *);
    
    /* helper routines */
    static int at91_ssc_activate(device_t dev);
    static void at91_ssc_deactivate(device_t dev);
    
    /* cdev routines */
    static d_open_t at91_ssc_open;
    static d_close_t at91_ssc_close;
    static d_read_t at91_ssc_read;
    static d_write_t at91_ssc_write;
    
    static struct cdevsw at91_ssc_cdevsw =
    {
            .d_version = D_VERSION,
            .d_open = at91_ssc_open,
            .d_close = at91_ssc_close,
            .d_read = at91_ssc_read,
           .d_write = at91_ssc_write,
   };
   
   static int
   at91_ssc_probe(device_t dev)
   {
           device_set_desc(dev, "SSC");
           return (0);
   }
   
   static int
   at91_ssc_attach(device_t dev)
   {
           struct at91_ssc_softc *sc = device_get_softc(dev);
           int err;
   
           sc->dev = dev;
           err = at91_ssc_activate(dev);
           if (err)
                   goto out;
   
           AT91_SSC_LOCK_INIT(sc);
   
           /*
            * Activate the interrupt
            */
           err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
               NULL, at91_ssc_intr, sc, &sc->intrhand);
           if (err) {
                   AT91_SSC_LOCK_DESTROY(sc);
                   goto out;
           }
           sc->cdev = make_dev(&at91_ssc_cdevsw, device_get_unit(dev), UID_ROOT,
               GID_WHEEL, 0600, "ssc%d", device_get_unit(dev));
           if (sc->cdev == NULL) {
                   err = ENOMEM;
                   goto out;
           }
           sc->cdev->si_drv1 = sc;
   
           // Init for TSC needs
           WR4(sc, SSC_CR, SSC_CR_SWRST);
           WR4(sc, SSC_CMR, 0);            // clock divider unused
           WR4(sc, SSC_RCMR,
               SSC_RCMR_CKS_RK | SSC_RCMR_CKO_NONE | SSC_RCMR_START_FALL_EDGE_RF);
           WR4(sc, SSC_RFMR,
               0x1f | SSC_RFMR_MSFBF | SSC_RFMR_FSOS_NONE);
           WR4(sc, SSC_TCMR,
               SSC_TCMR_CKS_TK | SSC_TCMR_CKO_NONE |  SSC_RCMR_START_CONT);
           WR4(sc, SSC_TFMR,
               0x1f | SSC_TFMR_DATDEF | SSC_TFMR_MSFBF | SSC_TFMR_FSOS_NEG_PULSE);
   
   out:;
           if (err)
                   at91_ssc_deactivate(dev);
           return (err);
   }
   
   static int
   at91_ssc_detach(device_t dev)
   {
           return (EBUSY); /* XXX */
   }
   
   static int
   at91_ssc_activate(device_t dev)
   {
           struct at91_ssc_softc *sc;
           int rid;
   
           sc = device_get_softc(dev);
           rid = 0;
           sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
               RF_ACTIVE);
           if (sc->mem_res == NULL)
                   goto errout;
           rid = 0;
           sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
               RF_ACTIVE);
           if (sc->irq_res == NULL)
                   goto errout;
           return (0);
   errout:
           at91_ssc_deactivate(dev);
           return (ENOMEM);
   }
   
   static void
   at91_ssc_deactivate(device_t dev)
   {
           struct at91_ssc_softc *sc;
   
           sc = device_get_softc(dev);
           if (sc->intrhand)
                   bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
           sc->intrhand = 0;
           bus_generic_detach(sc->dev);
           if (sc->mem_res)
                   bus_release_resource(dev, SYS_RES_IOPORT,
                       rman_get_rid(sc->mem_res), sc->mem_res);
           sc->mem_res = 0;
           if (sc->irq_res)
                   bus_release_resource(dev, SYS_RES_IRQ,
                       rman_get_rid(sc->irq_res), sc->irq_res);
           sc->irq_res = 0;
           return;
   }
   
   static void
   at91_ssc_intr(void *xsc)
   {
           struct at91_ssc_softc *sc = xsc;
   #if 0
           uint32_t status;
   
           /* Reading the status also clears the interrupt */
           status = RD4(sc, SSC_SR);
           if (status == 0)
                   return;
           AT91_SSC_LOCK(sc);
           AT91_SSC_UNLOCK(sc);
   #endif
           wakeup(sc);
           return;
   }
   
   static int 
   at91_ssc_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
   {
           struct at91_ssc_softc *sc;
   
           sc = CDEV2SOFTC(dev);
           AT91_SSC_LOCK(sc);
           if (!(sc->flags & OPENED)) {
                   sc->flags |= OPENED;
   #if 0
           // Enable interrupts
   #endif
           }
           AT91_SSC_UNLOCK(sc);
           return (0);
   }
   
   static int
   at91_ssc_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
   {
           struct at91_ssc_softc *sc;
   
           sc = CDEV2SOFTC(dev);
           AT91_SSC_LOCK(sc);
           sc->flags &= ~OPENED;
   #if 0
           // Disable interrupts
   #endif
           AT91_SSC_UNLOCK(sc);
           return (0);
   }
   
   static int
   at91_ssc_read(struct cdev *dev, struct uio *uio, int flag)
   {
           return EIO;
   }
   
   static int
   at91_ssc_write(struct cdev *dev, struct uio *uio, int flag)
   {
           return EIO;
   }
   
   static device_method_t at91_ssc_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         at91_ssc_probe),
           DEVMETHOD(device_attach,        at91_ssc_attach),
           DEVMETHOD(device_detach,        at91_ssc_detach),
   
           { 0, 0 }
   };
   
   static driver_t at91_ssc_driver = {
           "at91_ssc",
           at91_ssc_methods,
           sizeof(struct at91_ssc_softc),
   };
   
   DRIVER_MODULE(at91_ssc, atmelarm, at91_ssc_driver, at91_ssc_devclass, 0, 0);

Cache object: ace37a74fd4211853006a73233d62f53