// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Routine for IRQ handling from GF1/InterWave chip
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 */

#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;
        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
                        dev_dbg(gus->card->dev,
                                "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)
{
        snd_card_ro_proc_new(gus->card, "gusirq", gus, snd_gus_irq_info_read);
}

#endif