FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/isa/es1888.c

     /*
      * Copyright (c) 1999 Doug Rabson
      * 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.
     */
    
    #include <dev/sound/pcm/sound.h>
    #include <dev/sound/isa/sb.h>
    
    SND_DECLARE_FILE("$FreeBSD: releng/5.0/sys/dev/sound/isa/es1888.c 82180 2001-08-23 11:30:52Z cg $");
    
    #ifdef __alpha__
    static int
    es1888_dspready(u_int32_t port)
    {
            return ((inb(port + SBDSP_STATUS) & 0x80) == 0);
    }
    
    static int
    es1888_dspwr(u_int32_t port, u_char val)
    {
            int  i;
    
            for (i = 0; i < 1000; i++) {
                    if (es1888_dspready(port)) {
                            outb(port + SBDSP_CMD, val);
                            return 0;
                    }
                    if (i > 10) DELAY((i > 100)? 1000 : 10);
            }
            return ENXIO;
    }
    
    static u_int
    es1888_get_byte(u_int32_t port)
    {
            int i;
    
            for (i = 1000; i > 0; i--) {
                    if (inb(port + DSP_DATA_AVAIL) & 0x80)
                            return inb(port + DSP_READ);
                    else
                            DELAY(20);
            }
            return 0xffff;
    }
    
    static int
    es1888_reset(u_int32_t port)
    {
            outb(port + SBDSP_RST, 3);
            DELAY(100);
            outb(port + SBDSP_RST, 0);
            if (es1888_get_byte(port) != 0xAA) {
                    return ENXIO;   /* Sorry */
            }
            return 0;
    }
    
    static void
    es1888_configuration_mode(void)
    {
            /*
             * Emit the Read-Sequence-Key to enter configuration
             * mode. Note this only works after a reset (or after bit 2 of
             * mixer register 0x40 is set).
             *
             * 3 reads from 0x229 in a row guarantees reset of key
             * sequence to beginning.
             */
            inb(0x229);
            inb(0x229);
            inb(0x229);
    
            inb(0x22b);             /* state 1 */
            inb(0x229);             /* state 2 */
            inb(0x22b);             /* state 3 */
            inb(0x229);             /* state 4 */
            inb(0x229);             /* state 5 */
           inb(0x22b);             /* state 6 */
           inb(0x229);             /* state 7 */
   }
   
   static void
   es1888_set_port(u_int32_t port)
   {
           es1888_configuration_mode();
           inb(port);
   }
   #endif
   
   static void
   es1888_identify(driver_t *driver, device_t parent)
   {
   /*
    * Only use this on alpha since PNPBIOS is a better solution on x86.
    */
   #ifdef __alpha__
           u_int32_t lo, hi;
           device_t dev;
   
           es1888_set_port(0x220);
           if (es1888_reset(0x220))
                   return;
   
           /*
            * Check identification bytes for es1888.
            */
           if (es1888_dspwr(0x220, 0xe7))
                   return;
           hi = es1888_get_byte(0x220);
           lo = es1888_get_byte(0x220);
           if (hi != 0x68 || (lo & 0xf0) != 0x80)
                   return;
   
           /*
            * Program irq and drq.
            */
           if (es1888_dspwr(0x220, 0xc6) /* enter extended mode */
               || es1888_dspwr(0x220, 0xb1) /* write register b1 */
               || es1888_dspwr(0x220, 0x14) /* enable irq 5 */
               || es1888_dspwr(0x220, 0xb2) /* write register b1 */
               || es1888_dspwr(0x220, 0x18)) /* enable drq 1 */
                   return;
   
           /*
            * Create the device and program its resources.
            */
           dev = BUS_ADD_CHILD(parent, ISA_ORDER_PNP, NULL, -1);
           bus_set_resource(dev, SYS_RES_IOPORT, 0, 0x220, 0x10);
           bus_set_resource(dev, SYS_RES_IRQ, 0, 5, 1);
           bus_set_resource(dev, SYS_RES_DRQ, 0, 1, 1);
           isa_set_vendorid(dev, PNP_EISAID("ESS1888"));
           isa_set_logicalid(dev, PNP_EISAID("ESS1888"));
   #endif
   }
   
   static device_method_t es1888_methods[] = {
           /* Device interface */
           DEVMETHOD(device_identify,      es1888_identify),
   
           { 0, 0 }
   };
   
   static driver_t es1888_driver = {
           "pcm",
           es1888_methods,
           1,                      /* no softc */
   };
   
   DRIVER_MODULE(snd_es1888, isa, es1888_driver, pcm_devclass, 0, 0);
   MODULE_DEPEND(snd_es1888, snd_pcm, PCM_MINVER, PCM_PREFVER, PCM_MAXVER);
   MODULE_VERSION(snd_es1888, 1);
   
   

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