993 lines
19 KiB
C
993 lines
19 KiB
C
/* $NetBSD: lmcaudio.c,v 1.2 1996/11/23 03:37:37 mark Exp $ */
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/*
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* Copyright (c) 1996, Danny C Tsen.
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* Copyright (c) 1996, VLSI Technology Inc. All Rights Reserved.
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* Copyright (c) 1995 Melvin Tang-Richardson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Michael L. Hitch.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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/*
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* audio driver for lmc1982
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*
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* Interfaces with the NetBSD generic audio driver to provide SUN
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* /dev/audio (partial) compatibility.
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*/
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#include <sys/param.h> /* proc.h */
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#include <sys/types.h> /* dunno */
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#include <sys/conf.h> /* autoconfig functions */
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#include <sys/device.h> /* device calls */
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#include <sys/proc.h> /* device calls */
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#include <sys/audioio.h>
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#include <sys/errno.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <dev/audio_if.h>
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#include <machine/irqhandler.h>
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#include <machine/iomd.h>
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#include <machine/vidc.h>
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#include <machine/katelib.h>
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#include <arm32/mainbus/mainbus.h>
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#include <arm32/mainbus/waveform.h>
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#include "lmcaudio.h"
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#include <arm32/mainbus/lmc1982.h>
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struct audio_general {
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int in_sr;
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int out_sr;
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vm_offset_t silence;
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vm_offset_t beep;
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irqhandler_t ih;
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void (*intr) ();
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void *arg;
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vm_offset_t next_cur;
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vm_offset_t next_end;
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void (*next_intr) ();
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void *next_arg;
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int buffer;
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int in_progress;
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int open;
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int drain;
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} ag;
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struct lmcaudio_softc {
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struct device device;
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int iobase;
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int open;
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u_int encoding;
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u_int precision;
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u_int channels;
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int inport;
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int outport;
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};
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int lmcaudio_probe __P((struct device *parent, void *match, void *aux));
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void lmcaudio_attach __P((struct device *parent, struct device *self, void *aux));
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int lmcaudio_open __P((dev_t dev, int flags));
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void lmcaudio_close __P((void *addr));
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int lmcaudio_drain __P((void *addr));
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void lmcaudio_timeout __P((void *arg));
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int lmcaudio_intr __P((void *arg));
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int lmcaudio_dma_program __P((vm_offset_t cur, vm_offset_t end, void (*intr)(), void *arg));
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void lmcaudio_dummy_routine __P((void *arg));
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int lmcaudio_stereo __P((int channel, int position));
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int lmcaudio_rate __P((int rate));
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void lmcaudio_shutdown __P((void));
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int lmcaudio_hw_attach __P((struct lmcaudio_softc *sc));
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struct cfattach lmcaudio_ca = {
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sizeof(struct lmcaudio_softc), lmcaudio_probe, lmcaudio_attach
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};
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struct cfdriver lmcaudio_cd = {
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NULL, "lmcaudio", DV_DULL
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};
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int curr_rate = 11;
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void
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lmcaudio_beep_generate()
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{
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lmcaudio_dma_program(ag.beep, ag.beep+sizeof(beep_waveform)-16,
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lmcaudio_dummy_routine, NULL);
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}
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static int sdma_channel;
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int
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lmcaudio_probe(parent, match, aux)
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struct device *parent;
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void *match;
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void *aux;
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{
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int id;
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id = IOMD_ID;
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switch (id) {
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case RPC600_IOMD_ID:
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return(0);
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#ifdef RC7500
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case RC7500_IOC_ID:
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sdma_channel = IRQ_SDMA;
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return(1);
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#endif
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default:
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printf("lmcaudio: Unknown IOMD id=%04x", id);
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break;
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}
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return (0);
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}
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void
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lmcaudio_attach(parent, self, aux)
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struct device *parent;
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struct device *self;
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void *aux;
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{
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struct mainbus_attach_args *mb = aux;
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struct lmcaudio_softc *sc = (void *)self;
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sc->iobase = mb->mb_iobase;
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sc->open = 0;
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sc->encoding = AUDIO_ENCODING_LINEAR;
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sc->precision = 16;
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sc->channels = 2;
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sc->inport = 0;
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sc->outport = 0;
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ag.in_sr = 20000;
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ag.out_sr = 20000;
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ag.in_progress = 0;
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ag.next_cur = 0;
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ag.next_end = 0;
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ag.next_intr = NULL;
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ag.next_arg = NULL;
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/*
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* Enable serial sound. The digital serial sound interface
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* consists of 16 bits sample on each channel.
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*/
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outl(VIDC_BASE, VIDC_SCR | 0x03);
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/*
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* Video LCD and Serial Sound Mux control. - Japanese format.
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*/
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outb(IOMD_VIDMUX, 0x02);
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volume_ctl(VINPUTSEL, VIN1);
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volume_ctl(VLOUD, 0);
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volume_ctl(VBASS, VDBM0);
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volume_ctl(VTREB, VDBM0);
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volume_ctl(VLEFT, 18);
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volume_ctl(VRIGHT, 18);
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volume_ctl(VMODE, VSTEREO);
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volume_ctl(VDIN, 0);
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/* Program the silence buffer and reset the DMA channel */
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ag.silence = kmem_alloc(kernel_map, NBPG);
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if (ag.silence == NULL)
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panic("lmcaudio: Cannot allocate memory\n");
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bzero((char *)ag.silence, NBPG);
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ag.beep = kmem_alloc(kernel_map, NBPG);
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if (ag.beep == NULL)
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panic("lmcaudio: Cannot allocate memory\n");
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bcopy((char *)beep_waveform, (char *)ag.beep, sizeof(beep_waveform));
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conv_jap((u_char *) ag.beep, sizeof(beep_waveform));
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ag.buffer = 0;
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/* Install the irq handler for the DMA interrupt */
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ag.ih.ih_func = lmcaudio_intr;
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ag.ih.ih_arg = NULL;
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ag.ih.ih_level = IPL_NONE;
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ag.intr = NULL;
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disable_irq(sdma_channel);
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if (irq_claim(sdma_channel, &(ag.ih)))
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panic("lmcaudio: couldn't claim VIDC AUDIO DMA channel");
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disable_irq(sdma_channel);
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lmcaudio_rate(ag.out_sr);
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lmcaudio_beep_generate();
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lmcaudio_hw_attach(sc);
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}
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int nauzero = 0;
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int ndmacall = 0;
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int
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lmcaudio_open(dev, flags)
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dev_t dev;
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int flags;
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{
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struct lmcaudio_softc *sc;
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int unit = AUDIOUNIT (dev);
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int s;
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#ifdef DEBUG
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printf("DEBUG: lmcaudio_open called\n");
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#endif
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if (unit >= lmcaudio_cd.cd_ndevs)
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return ENODEV;
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sc = lmcaudio_cd.cd_devs[unit];
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if (!sc)
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return ENXIO;
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s = splhigh();
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if (sc->open != 0) {
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(void)splx(s);
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return EBUSY;
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}
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sc->open = 1;
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ag.open = 1;
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ag.drain = 0;
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nauzero = 0;
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ndmacall = 0;
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(void)splx(s);
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return 0;
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}
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void
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lmcaudio_close(addr)
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void *addr;
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{
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struct lmcaudio_softc *sc = addr;
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#ifdef DEBUG
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printf("DEBUG: lmcaudio_close called\n");
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#endif
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lmcaudio_shutdown();
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sc->open = 0;
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ag.open = 0;
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ag.drain = 0;
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#if 0
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printf("ndmacall=%d, auzero=%d\n", ndmacall, nauzero);
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#endif
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nauzero = 0;
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ndmacall = 0;
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}
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void
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lmcaudio_timeout(arg)
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void *arg;
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{
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wakeup(arg);
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}
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/*
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* Drain the buffer before closing the device.
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*/
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int
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lmcaudio_drain(addr)
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void *addr;
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{
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ag.drain = 1;
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timeout(lmcaudio_timeout, &ag.drain, 30 * hz);
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(void) tsleep(lmcaudio_timeout, PWAIT | PCATCH, "lmcdrain", 0);
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ag.drain = 0;
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return(0);
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}
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/* ************************************************************************* *
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| Interface to the generic audio driver |
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* ************************************************************************* */
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int lmcaudio_set_in_sr __P((void *, u_long));
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u_long lmcaudio_get_in_sr __P((void *));
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int lmcaudio_set_out_sr __P((void *, u_long));
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u_long lmcaudio_get_out_sr __P((void *));
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int lmcaudio_query_encoding __P((void *, struct audio_encoding *));
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int lmcaudio_set_encoding __P((void *, u_int));
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int lmcaudio_get_encoding __P((void *));
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int lmcaudio_set_precision __P((void *, u_int));
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int lmcaudio_getprecision __P((void *));
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int lmcaudio_set_channels __P((void *, int));
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int lmcaudio_get_channels __P((void *));
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int lmcaudio_round_blocksize __P((void *, int));
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int lmcaudio_set_out_port __P((void *, int));
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int lmcaudio_get_out_port __P((void *));
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int lmcaudio_set_in_port __P((void *, int));
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int lmcaudio_get_in_port __P((void *));
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int lmcaudio_commit_settings __P((void *));
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u_int lmcaudio_get_silence __P((int));
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void lmcaudio_sw_encode __P((void *, int, u_char *, int));
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void lmcaudio_sw_decode __P((void *, int, u_char *, int));
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int lmcaudio_start_output __P((void *, void *, int, void (*)(), void *));
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int lmcaudio_start_input __P((void *, void *, int, void (*)(), void *));
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int lmcaudio_halt_output __P((void *));
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int lmcaudio_halt_input __P((void *));
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int lmcaudio_cont_output __P((void *));
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int lmcaudio_cont_input __P((void *));
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int lmcaudio_speaker_ctl __P((void *, int));
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int lmcaudio_getdev __P((void *, struct audio_device *));
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int lmcaudio_setfd __P((void *, int));
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int lmcaudio_set_port __P((void *, mixer_ctrl_t *));
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int lmcaudio_get_port __P((void *, mixer_ctrl_t *));
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int lmcaudio_query_devinfo __P((void *, mixer_devinfo_t *));
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struct audio_device lmcaudio_device = {
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"LMCAudio 16-bit",
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"x",
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"lmcaudio"
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};
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int
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lmcaudio_set_in_sr(addr, sr)
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void *addr;
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u_long sr;
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{
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ag.in_sr = sr;
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return 0;
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}
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u_long
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lmcaudio_get_in_sr(addr)
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void *addr;
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{
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return ag.in_sr;
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}
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int
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lmcaudio_set_out_sr(addr, sr)
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void *addr;
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u_long sr;
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{
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ag.out_sr = sr;
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lmcaudio_rate(sr);
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return 0;
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}
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u_long
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lmcaudio_get_out_sr(addr)
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void *addr;
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{
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return(ag.out_sr);
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}
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int
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lmcaudio_query_encoding(addr, fp)
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void *addr;
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struct audio_encoding *fp;
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{
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switch (fp->index) {
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case 0:
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strcpy (fp->name, AudioElinear);
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fp->format_id = AUDIO_ENCODING_LINEAR;
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break;
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default:
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return (EINVAL);
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}
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return 0;
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}
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int
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lmcaudio_set_encoding(addr, enc)
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void *addr;
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u_int enc;
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{
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struct lmcaudio_softc *sc = addr;
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switch (enc) {
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case AUDIO_ENCODING_LINEAR:
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#ifdef DEBUG
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printf ( "DEBUG: Set linear encoding\n" );
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#endif
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sc->encoding = enc;
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break;
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default:
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return (EINVAL);
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}
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return 0;
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}
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int
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lmcaudio_get_encoding(addr)
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void *addr;
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{
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struct lmcaudio_softc *sc = addr;
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return(sc->encoding);
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}
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int
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lmcaudio_set_precision(addr, prec)
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void *addr;
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u_int prec;
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{
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register struct lmcaudio_softc *sc = addr;
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if (prec != 16)
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return EINVAL;
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sc->precision = prec;
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return 0;
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}
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int
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lmcaudio_get_precision(addr)
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void *addr;
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{
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register struct lmcaudio_softc *sc = addr;
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return(sc->precision);
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}
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int
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lmcaudio_set_channels(addr, chans)
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void *addr;
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int chans;
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{
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register struct lmcaudio_softc *sc = addr;
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if (chans != 2)
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return EINVAL;
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sc->channels = chans;
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return 0;
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}
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int
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lmcaudio_get_channels(addr)
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void *addr;
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{
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register struct lmcaudio_softc *sc = addr;
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return(sc->channels);;
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}
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int
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lmcaudio_round_blocksize(addr, blk)
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void *addr;
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int blk;
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{
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if (blk > NBPG)
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blk = NBPG;
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else if (blk & 0x0f) /* quad word */
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blk &= ~0x0f;
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return blk;
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}
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int
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lmcaudio_set_out_port(addr, port)
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void *addr;
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int port;
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{
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register struct lmcaudio_softc *sc = addr;
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sc->outport = port;
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return(0);
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}
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int
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lmcaudio_get_out_port(addr)
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void *addr;
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{
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register struct lmcaudio_softc *sc = addr;
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return(sc->outport);
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}
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int
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lmcaudio_set_in_port(addr, port)
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void *addr;
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int port;
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{
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register struct lmcaudio_softc *sc = addr;
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sc->inport = port;
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return(0);
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}
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int
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lmcaudio_get_in_port(addr)
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void *addr;
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{
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register struct lmcaudio_softc *sc = addr;
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return(sc->inport);
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}
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int
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lmcaudio_commit_settings(addr)
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void *addr;
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{
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#ifdef DEBUG
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printf ( "DEBUG: committ_settings\n" );
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#endif
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return(0);
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}
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u_int
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lmcaudio_get_silence(enc)
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int enc;
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{
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#define ULAW_SILENCE 0x7f
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#define LINEAR_SILENCE 0
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u_int auzero = 0;
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switch (enc) {
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case AUDIO_ENCODING_LINEAR:
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default:
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auzero = LINEAR_SILENCE;
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break;
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}
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return(auzero);
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}
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void
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lmcaudio_sw_encode(addr, e, p, cc)
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void *addr;
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int e;
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u_char *p;
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int cc;
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{
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#ifdef DEBUG
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printf ( "DEBUG: sw_encode\n" );
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#endif
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return;
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}
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void
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lmcaudio_sw_decode(addr, e, p, cc)
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void *addr;
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int e;
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u_char *p;
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int cc;
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{
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#ifdef DEBUG
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printf ( "DEBUG: sw_decode\n" );
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#endif
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}
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#define ROUND(s) ( ((int)s) & (~(NBPG-1)) )
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extern char *auzero_block;
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int
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lmcaudio_start_output(addr, p, cc, intr, arg)
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void *addr;
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void *p;
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int cc;
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void (*intr)();
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void *arg;
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{
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#ifdef DEBUG
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printf ( "lmcaudio_start_output (%d) %08x %08x\n", cc, intr, arg );
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#endif
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if (p == auzero_block)
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nauzero++;
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ndmacall++;
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if (((u_int) p & 0x0000000f) || (ROUND(p) != ROUND(p+cc-1))) {
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/*
|
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* Not on quad word boundary.
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*/
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bcopy(p, (char *)ag.silence, (cc > NBPG ? NBPG : cc));
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p = (void *)ag.silence;
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if (cc > NBPG) {
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cc = NBPG;
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}
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}
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lmcaudio_dma_program((vm_offset_t)p, (vm_offset_t)(p+cc), intr, arg);
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return(0);
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}
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int
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lmcaudio_start_input(addr, p, cc, intr, arg)
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void *addr;
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void *p;
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int cc;
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void (*intr)();
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void *arg;
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{
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return EIO;
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}
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int
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lmcaudio_halt_output(addr)
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void *addr;
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{
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#ifdef DEBUG
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printf ( "DEBUG: lmcaudio_halt_output\n" );
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#endif
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return EIO;
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}
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int
|
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lmcaudio_halt_input(addr)
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void *addr;
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{
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#ifdef DEBUG
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printf ( "DEBUG: lmcaudio_halt_output\n" );
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#endif
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return EIO;
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}
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int
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lmcaudio_cont_output(addr)
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void *addr;
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{
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#ifdef DEBUG
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printf ( "DEBUG: lmcaudio_halt_output\n" );
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#endif
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return EIO;
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}
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|
|
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int
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lmcaudio_cont_input(addr)
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void *addr;
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|
{
|
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#ifdef DEBUG
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printf ( "DEBUG: lmcaudio_halt_output\n" );
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#endif
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return EIO;
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}
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|
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int
|
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lmcaudio_speaker_ctl(addr, newstate)
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void *addr;
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int newstate;
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|
{
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#ifdef DEBUG
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printf("DEBUG: lmcaudio_speaker_ctl\n");
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#endif
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|
|
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switch (newstate) {
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case SPKR_ON:
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volume_ctl(VINPUTSEL, VIN1);
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break;
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case SPKR_OFF:
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volume_ctl(VINPUTSEL, VMUTE);
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break;
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}
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return(0);
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}
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|
|
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int
|
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lmcaudio_getdev(addr, retp)
|
|
void *addr;
|
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struct audio_device *retp;
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|
{
|
|
*retp = lmcaudio_device;
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return(0);
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|
}
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|
|
|
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int
|
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lmcaudio_setfd(addr, flag)
|
|
void *addr;
|
|
int flag;
|
|
{
|
|
/* Can't do full-duplex */
|
|
return(ENOTTY);
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|
}
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|
|
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int
|
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lmcaudio_set_port(addr, cp)
|
|
void *addr;
|
|
mixer_ctrl_t *cp;
|
|
{
|
|
return(EINVAL);
|
|
}
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|
|
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int
|
|
lmcaudio_get_port(addr, cp)
|
|
void *addr;
|
|
mixer_ctrl_t *cp;
|
|
{
|
|
return(EINVAL);
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|
}
|
|
|
|
int
|
|
lmcaudio_query_devinfo(addr, dip)
|
|
void *addr;
|
|
register mixer_devinfo_t *dip;
|
|
{
|
|
return(0);
|
|
}
|
|
|
|
struct audio_hw_if lmcaudio_hw_if = {
|
|
lmcaudio_open,
|
|
lmcaudio_close,
|
|
lmcaudio_drain,
|
|
lmcaudio_set_in_sr,
|
|
lmcaudio_get_in_sr,
|
|
lmcaudio_set_out_sr,
|
|
lmcaudio_get_out_sr,
|
|
lmcaudio_query_encoding,
|
|
lmcaudio_set_encoding,
|
|
lmcaudio_get_encoding,
|
|
lmcaudio_set_precision,
|
|
lmcaudio_get_precision,
|
|
lmcaudio_set_channels,
|
|
lmcaudio_get_channels,
|
|
lmcaudio_round_blocksize,
|
|
lmcaudio_set_out_port,
|
|
lmcaudio_get_out_port,
|
|
lmcaudio_set_in_port,
|
|
lmcaudio_get_in_port,
|
|
lmcaudio_commit_settings,
|
|
lmcaudio_get_silence,
|
|
lmcaudio_sw_encode,
|
|
lmcaudio_sw_decode,
|
|
lmcaudio_start_output,
|
|
lmcaudio_start_input,
|
|
lmcaudio_halt_output,
|
|
lmcaudio_halt_input,
|
|
lmcaudio_cont_output,
|
|
lmcaudio_cont_input,
|
|
lmcaudio_speaker_ctl,
|
|
lmcaudio_getdev,
|
|
lmcaudio_setfd,
|
|
lmcaudio_set_port,
|
|
lmcaudio_get_port,
|
|
lmcaudio_query_devinfo,
|
|
0, /* not full duplex */
|
|
0
|
|
};
|
|
|
|
void
|
|
lmcaudio_dummy_routine(arg)
|
|
void *arg;
|
|
{
|
|
}
|
|
|
|
int
|
|
lmcaudio_hw_attach(sc)
|
|
struct lmcaudio_softc *sc;
|
|
{
|
|
return(audio_hardware_attach(&lmcaudio_hw_if, sc));
|
|
}
|
|
|
|
int
|
|
lmcaudio_rate(rate)
|
|
int rate;
|
|
{
|
|
curr_rate = (int)(250000/rate + 0.5) - 2;
|
|
outl(VIDC_BASE, VIDC_SFR | curr_rate);
|
|
return(0);
|
|
}
|
|
|
|
int
|
|
lmcaudio_stereo(channel, position)
|
|
int channel;
|
|
int position;
|
|
{
|
|
return(0);
|
|
}
|
|
|
|
#define PHYS(x) (pmap_extract( kernel_pmap, ((x)&PG_FRAME) ))
|
|
|
|
/*
|
|
* Program the next buffer to be used
|
|
* This function must be re-entrant, maximum re-entrancy of 2
|
|
*/
|
|
|
|
int
|
|
lmcaudio_dma_program(cur, end, intr, arg)
|
|
vm_offset_t cur;
|
|
vm_offset_t end;
|
|
void (*intr)();
|
|
void *arg;
|
|
{
|
|
int size = end - cur;
|
|
u_int stopflag = 0;
|
|
|
|
if (ag.drain) {
|
|
ag.drain++;
|
|
stopflag = 0x80000000;
|
|
}
|
|
|
|
/* If there isn't a transfer in progress then start a new one */
|
|
if (ag.in_progress == 0) {
|
|
ag.buffer = 0;
|
|
outl(IOMD_SD0CR, 0x90); /* Reset State Machine */
|
|
outl(IOMD_SD0CR, 0x30); /* Reset State Machine */
|
|
|
|
outl(IOMD_SD0CURA, PHYS(cur));
|
|
outl(IOMD_SD0ENDA, (PHYS(cur) + size - 16)|stopflag);
|
|
outl(IOMD_SD0CURB, PHYS(cur));
|
|
outl(IOMD_SD0ENDB, (PHYS(cur) + size - 16)|stopflag);
|
|
|
|
ag.in_progress = 1;
|
|
|
|
ag.next_cur = ag.next_end = 0;
|
|
ag.next_intr = ag.next_arg = 0;
|
|
|
|
ag.intr = intr;
|
|
ag.arg = arg;
|
|
|
|
/* The driver 'clicks' between buffer swaps, leading me to think */
|
|
/* that the fifo is much small than on other sound cards. So */
|
|
/* so I'm going to have to do some tricks here */
|
|
|
|
(*ag.intr)(ag.arg); /* Schedule the next buffer */
|
|
ag.intr = lmcaudio_dummy_routine; /* Already done this */
|
|
ag.arg = NULL;
|
|
|
|
enable_irq(sdma_channel);
|
|
} else {
|
|
/* Otherwise schedule the next one */
|
|
if (ag.next_cur != 0) {
|
|
/* If there's one scheduled then complain */
|
|
printf ( "lmcaudio: Buffer already Q'ed\n" );
|
|
return EIO;
|
|
} else {
|
|
/* We're OK to schedule it now */
|
|
ag.buffer = (++ag.buffer) & 1;
|
|
ag.next_cur = PHYS(cur);
|
|
ag.next_end = (ag.next_cur + size - 16) | stopflag;
|
|
ag.next_intr = intr;
|
|
ag.next_arg = arg;
|
|
}
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
void
|
|
lmcaudio_shutdown()
|
|
{
|
|
/* Shut down the channel */
|
|
ag.intr = NULL;
|
|
ag.in_progress = 0;
|
|
|
|
#ifdef PRINT
|
|
printf ( "lmcaudio: stop output\n" );
|
|
#endif
|
|
|
|
bzero((char *)ag.silence, NBPG);
|
|
outl(IOMD_SD0CURA, PHYS(ag.silence));
|
|
outl(IOMD_SD0ENDA, (PHYS(ag.silence) + NBPG - 16) | 0x80000000);
|
|
disable_irq(sdma_channel);
|
|
outl(IOMD_SD0CR, 0x90); /* Reset State Machine */
|
|
}
|
|
|
|
#define OVERRUN (0x04)
|
|
#define INTERRUPT (0x02)
|
|
#define BANK_A (0x00)
|
|
#define BANK_B (0x01)
|
|
|
|
int
|
|
lmcaudio_intr(arg)
|
|
void *arg;
|
|
{
|
|
int status = inb(IOMD_SD0ST);
|
|
void (*nintr)();
|
|
void *narg;
|
|
void (*xintr)();
|
|
void *xarg;
|
|
int xcur, xend;
|
|
u_char direction;
|
|
|
|
if (ag.open == 0) {
|
|
lmcaudio_shutdown ();
|
|
return(0);
|
|
}
|
|
|
|
nintr = ag.intr;
|
|
narg = ag.arg;
|
|
ag.intr = NULL;
|
|
|
|
xintr = ag.next_intr;
|
|
xarg = ag.next_arg;
|
|
xcur = ag.next_cur;
|
|
xend = ag.next_end;
|
|
ag.next_cur = 0;
|
|
ag.intr = xintr;
|
|
ag.arg = xarg;
|
|
|
|
if (nintr) {
|
|
(*nintr)(narg);
|
|
}
|
|
|
|
if (xcur == 0) {
|
|
untimeout(lmcaudio_timeout, &ag.drain);
|
|
wakeup(lmcaudio_timeout);
|
|
return(0);
|
|
#if 0
|
|
lmcaudio_shutdown ();
|
|
#endif
|
|
} else {
|
|
/*
|
|
* OIA means channel A should be programmed.
|
|
* OIB means channel B should be programmed.
|
|
* IA means channel A is busy, program B.
|
|
* IB means channel B is busy, program A.
|
|
*/
|
|
if (status & OVERRUN) {
|
|
direction = (status & BANK_B);
|
|
} else {
|
|
direction = (status ^ BANK_B) & BANK_B;
|
|
}
|
|
|
|
if (direction) {
|
|
outl(IOMD_SD0CURB, xcur);
|
|
outl(IOMD_SD0ENDB, xend);
|
|
} else {
|
|
outl(IOMD_SD0CURA, xcur);
|
|
outl(IOMD_SD0ENDA, xend);
|
|
}
|
|
status = inb(IOMD_SD0ST);
|
|
if (status & OVERRUN) {
|
|
if (status & BANK_B) {
|
|
outl(IOMD_SD0CURB, xcur);
|
|
outl(IOMD_SD0ENDB, xend);
|
|
} else {
|
|
outl(IOMD_SD0CURA, xcur);
|
|
outl(IOMD_SD0ENDA, xend);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!ag.drain && ag.next_cur == 0) {
|
|
(*ag.intr)(ag.arg); /* Schedule the next buffer */
|
|
ag.intr = lmcaudio_dummy_routine; /* Already done this */
|
|
ag.arg = NULL;
|
|
}
|
|
if (ag.drain == 1) {
|
|
lmcaudio_dma_program(ag.silence, ag.silence+NBPG,
|
|
lmcaudio_dummy_routine, NULL);
|
|
}
|
|
return 0;
|
|
}
|