gus_irq.c

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/*
 *  Routine for IRQ handling from GF1/InterWave chip
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/core.h>
#include <sound/info.h>
#include <sound/gus.h>

#ifdef CONFIG_SND_DEBUG
#define STAT_ADD(x) ((x)++)
#else
#define STAT_ADD(x) while (0) { ; }
#endif

irqreturn_t snd_gus_interrupt(int irq, void *dev_id)
{
    struct snd_gus_card * gus = dev_id;
    unsigned char status;
    int loop = 100;
    int handled = 0;

__again:
    status = inb(gus->gf1.reg_irqstat);
    if (status == 0)
        return IRQ_RETVAL(handled);
    handled = 1;
    /* snd_printk(KERN_DEBUG "IRQ: status = 0x%x\n", status); */
    if (status & 0x02) {
        STAT_ADD(gus->gf1.interrupt_stat_midi_in);
        if (gus->gf1.interrupt_handler_midi_in)
            gus->gf1.interrupt_handler_midi_in(gus);
    }
    if (status & 0x01) {
        STAT_ADD(gus->gf1.interrupt_stat_midi_out);
        if (gus->gf1.interrupt_handler_midi_out)
            gus->gf1.interrupt_handler_midi_out(gus);
    }
    if (status & (0x20 | 0x40)) {
        unsigned int already, _current_;
        unsigned char voice_status, voice;
        struct snd_gus_voice *pvoice;

        already = 0;
        while (((voice_status = snd_gf1_i_read8(gus, SNDRV_GF1_GB_VOICES_IRQ)) & 0xc0) != 0xc0) {
            voice = voice_status & 0x1f;
            _current_ = 1 << voice;
            if (already & _current_)
                continue;   /* multi request */
            already |= _current_;   /* mark request */
#if 0
            printk(KERN_DEBUG "voice = %i, voice_status = 0x%x, "
                   "voice_verify = %i\n",
                   voice, voice_status, inb(GUSP(gus, GF1PAGE)));
#endif
            pvoice = &gus->gf1.voices[voice]; 
            if (pvoice->use) {
                if (!(voice_status & 0x80)) {   /* voice position IRQ */
                    STAT_ADD(pvoice->interrupt_stat_wave);
                    pvoice->handler_wave(gus, pvoice);
                }
                if (!(voice_status & 0x40)) {   /* volume ramp IRQ */
                    STAT_ADD(pvoice->interrupt_stat_volume);
                    pvoice->handler_volume(gus, pvoice);
                }
            } else {
                STAT_ADD(gus->gf1.interrupt_stat_voice_lost);
                snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_ADDRESS_CONTROL);
                snd_gf1_i_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
            }
        }
    }
    if (status & 0x04) {
        STAT_ADD(gus->gf1.interrupt_stat_timer1);
        if (gus->gf1.interrupt_handler_timer1)
            gus->gf1.interrupt_handler_timer1(gus);
    }
    if (status & 0x08) {
        STAT_ADD(gus->gf1.interrupt_stat_timer2);
        if (gus->gf1.interrupt_handler_timer2)
            gus->gf1.interrupt_handler_timer2(gus);
    }
    if (status & 0x80) {
        if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL) & 0x40) {
            STAT_ADD(gus->gf1.interrupt_stat_dma_write);
            if (gus->gf1.interrupt_handler_dma_write)
                gus->gf1.interrupt_handler_dma_write(gus);
        }
        if (snd_gf1_i_look8(gus, SNDRV_GF1_GB_REC_DMA_CONTROL) & 0x40) {
            STAT_ADD(gus->gf1.interrupt_stat_dma_read);
            if (gus->gf1.interrupt_handler_dma_read)
                gus->gf1.interrupt_handler_dma_read(gus);
        }
    }
    if (--loop > 0)
        goto __again;
    return IRQ_NONE;
}

#ifdef CONFIG_SND_DEBUG
static void snd_gus_irq_info_read(struct snd_info_entry *entry, 
                  struct snd_info_buffer *buffer)
{
    struct snd_gus_card *gus;
    struct snd_gus_voice *pvoice;
    int idx;

    gus = entry->private_data;
    snd_iprintf(buffer, "midi out = %u\n", gus->gf1.interrupt_stat_midi_out);
    snd_iprintf(buffer, "midi in = %u\n", gus->gf1.interrupt_stat_midi_in);
    snd_iprintf(buffer, "timer1 = %u\n", gus->gf1.interrupt_stat_timer1);
    snd_iprintf(buffer, "timer2 = %u\n", gus->gf1.interrupt_stat_timer2);
    snd_iprintf(buffer, "dma write = %u\n", gus->gf1.interrupt_stat_dma_write);
    snd_iprintf(buffer, "dma read = %u\n", gus->gf1.interrupt_stat_dma_read);
    snd_iprintf(buffer, "voice lost = %u\n", gus->gf1.interrupt_stat_voice_lost);
    for (idx = 0; idx < 32; idx++) {
        pvoice = &gus->gf1.voices[idx];
        snd_iprintf(buffer, "voice %i: wave = %u, volume = %u\n",
                    idx,
                    pvoice->interrupt_stat_wave,
                    pvoice->interrupt_stat_volume);
    }
}

void snd_gus_irq_profile_init(struct snd_gus_card *gus)
{
    struct snd_info_entry *entry;

    if (! snd_card_proc_new(gus->card, "gusirq", &entry))
        snd_info_set_text_ops(entry, gus, snd_gus_irq_info_read);
}

#endif