FreeBSD/Linux Kernel Cross Reference
sys/arm/freescale/imx/imx6_audmux.c

     /*-
      * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
      * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
     */
    
    /*
     * i.MX6 Digital Audio Multiplexer (AUDMUX)
     * Chapter 16, i.MX 6Dual/6Quad Applications Processor Reference Manual,
     * Rev. 1, 04/2013
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/malloc.h>
    #include <sys/endian.h>
    #include <sys/rman.h>
    #include <sys/timeet.h>
    #include <sys/timetc.h>
    
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <machine/bus.h>
    #include <machine/cpu.h>
    #include <machine/intr.h>
    
    #define READ4(_sc, _reg)        \
            bus_space_read_4(_sc->bst, _sc->bsh, _reg)
    #define WRITE4(_sc, _reg, _val) \
            bus_space_write_4(_sc->bst, _sc->bsh, _reg, _val)
    
    #define AUDMUX_PTCR(n)  (0x8 * (n - 1)) /* Port Timing Control Register */
    #define  PTCR_TFS_DIR   (1 << 31)       /* Transmit Frame Sync Direction Control */
    #define  PTCR_TFSEL_S   27              /* Transmit Frame Sync Select */
    #define  PTCR_TFSEL_M   0xf
    #define  PTCR_TCLKDIR   (1 << 26)       /* Transmit Clock Direction Control */
    #define  PTCR_TCSEL_S   22              /* Transmit Clock Select. */
    #define  PTCR_TCSEL_M   0xf
    #define  PTCR_RFS_DIR   (1 << 21)       /* Receive Frame Sync Direction Control */
    #define  PTCR_SYN       (1 << 11)
    #define AUDMUX_PDCR(n)  (0x8 * (n - 1) + 0x4)   /* Port Data Control Reg */
    #define  PDCR_RXDSEL_S          13      /* Receive Data Select */
    #define  PDCR_RXDSEL_M          0x3
    #define  PDCR_RXDSEL_PORT(n)    (n - 1)
    
    struct audmux_softc {
            struct resource         *res[1];
            bus_space_tag_t         bst;
            bus_space_handle_t      bsh;
            void                    *ih;
    };
    
    static struct resource_spec audmux_spec[] = {
            { SYS_RES_MEMORY,       0,      RF_ACTIVE },
            { -1, 0 }
    };
    
    static int
    audmux_probe(device_t dev)
    {
    
            if (!ofw_bus_status_okay(dev))
                    return (ENXIO);
    
            if (!ofw_bus_is_compatible(dev, "fsl,imx6q-audmux"))
                    return (ENXIO);
    
            device_set_desc(dev, "i.MX6 Digital Audio Multiplexer");
            return (BUS_PROBE_DEFAULT);
    }
    
   static int
   audmux_configure(struct audmux_softc *sc,
           int ssi_port, int audmux_port)
   {
           uint32_t reg;
   
           /* Direction: output */
           reg = (PTCR_TFS_DIR | PTCR_TCLKDIR | PTCR_SYN);
           WRITE4(sc, AUDMUX_PTCR(audmux_port), reg);
   
           /* Select source */
           reg = (PDCR_RXDSEL_PORT(ssi_port) << PDCR_RXDSEL_S);
           WRITE4(sc, AUDMUX_PDCR(audmux_port), reg);
   
           return (0);
   }
   
   static int
   audmux_attach(device_t dev)
   {
           struct audmux_softc *sc;
   
           sc = device_get_softc(dev);
   
           if (bus_alloc_resources(dev, audmux_spec, sc->res)) {
                   device_printf(dev, "could not allocate resources\n");
                   return (ENXIO);
           }
   
           /* Memory interface */
           sc->bst = rman_get_bustag(sc->res[0]);
           sc->bsh = rman_get_bushandle(sc->res[0]);
   
           /*
            * Direct SSI1 output to AUDMUX5 pins.
            * TODO: dehardcore this.
            */
           audmux_configure(sc, 1, 5);
   
           return (0);
   };
   
   static device_method_t audmux_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         audmux_probe),
           DEVMETHOD(device_attach,        audmux_attach),
           { 0, 0 }
   };
   
   static driver_t audmux_driver = {
           "audmux",
           audmux_methods,
           sizeof(struct audmux_softc),
   };
   
   static devclass_t audmux_devclass;
   
   DRIVER_MODULE(audmux, simplebus, audmux_driver, audmux_devclass, 0, 0);

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