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gus_reset.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *
 *
 *   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/driver.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/gus.h>

extern void snd_gf1_timers_init(struct snd_gus_card * gus);
extern void snd_gf1_timers_done(struct snd_gus_card * gus);
extern int snd_gf1_synth_init(struct snd_gus_card * gus);
extern void snd_gf1_synth_done(struct snd_gus_card * gus);

/*
 *  ok.. default interrupt handlers...
 */

static void snd_gf1_default_interrupt_handler_midi_out(struct snd_gus_card * gus)
{
      snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd &= ~0x20);
}

static void snd_gf1_default_interrupt_handler_midi_in(struct snd_gus_card * gus)
{
      snd_gf1_uart_cmd(gus, gus->gf1.uart_cmd &= ~0x80);
}

static void snd_gf1_default_interrupt_handler_timer1(struct snd_gus_card * gus)
{
      snd_gf1_i_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, gus->gf1.timer_enabled &= ~4);
}

static void snd_gf1_default_interrupt_handler_timer2(struct snd_gus_card * gus)
{
      snd_gf1_i_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, gus->gf1.timer_enabled &= ~8);
}

static void snd_gf1_default_interrupt_handler_wave_and_volume(struct snd_gus_card * gus, struct snd_gus_voice * voice)
{
      snd_gf1_i_ctrl_stop(gus, 0x00);
      snd_gf1_i_ctrl_stop(gus, 0x0d);
}

static void snd_gf1_default_interrupt_handler_dma_write(struct snd_gus_card * gus)
{
      snd_gf1_i_write8(gus, 0x41, 0x00);
}

static void snd_gf1_default_interrupt_handler_dma_read(struct snd_gus_card * gus)
{
      snd_gf1_i_write8(gus, 0x49, 0x00);
}

void snd_gf1_set_default_handlers(struct snd_gus_card * gus, unsigned int what)
{
      if (what & SNDRV_GF1_HANDLER_MIDI_OUT)
            gus->gf1.interrupt_handler_midi_out = snd_gf1_default_interrupt_handler_midi_out;
      if (what & SNDRV_GF1_HANDLER_MIDI_IN)
            gus->gf1.interrupt_handler_midi_in = snd_gf1_default_interrupt_handler_midi_in;
      if (what & SNDRV_GF1_HANDLER_TIMER1)
            gus->gf1.interrupt_handler_timer1 = snd_gf1_default_interrupt_handler_timer1;
      if (what & SNDRV_GF1_HANDLER_TIMER2)
            gus->gf1.interrupt_handler_timer2 = snd_gf1_default_interrupt_handler_timer2;
      if (what & SNDRV_GF1_HANDLER_VOICE) {
            struct snd_gus_voice *voice;
            
            voice = &gus->gf1.voices[what & 0xffff];
            voice->handler_wave =
            voice->handler_volume = snd_gf1_default_interrupt_handler_wave_and_volume;
            voice->handler_effect = NULL;
            voice->volume_change = NULL;
      }
      if (what & SNDRV_GF1_HANDLER_DMA_WRITE)
            gus->gf1.interrupt_handler_dma_write = snd_gf1_default_interrupt_handler_dma_write;
      if (what & SNDRV_GF1_HANDLER_DMA_READ)
            gus->gf1.interrupt_handler_dma_read = snd_gf1_default_interrupt_handler_dma_read;
}

/*

 */

static void snd_gf1_clear_regs(struct snd_gus_card * gus)
{
      unsigned long flags;

      spin_lock_irqsave(&gus->reg_lock, flags);
      inb(GUSP(gus, IRQSTAT));
      snd_gf1_write8(gus, 0x41, 0); /* DRAM DMA Control Register */
      snd_gf1_write8(gus, 0x45, 0); /* Timer Control */
      snd_gf1_write8(gus, 0x49, 0); /* Sampling Control Register */
      spin_unlock_irqrestore(&gus->reg_lock, flags);
}

static void snd_gf1_look_regs(struct snd_gus_card * gus)
{
      unsigned long flags;

      spin_lock_irqsave(&gus->reg_lock, flags);
      snd_gf1_look8(gus, 0x41);     /* DRAM DMA Control Register */
      snd_gf1_look8(gus, 0x49);     /* Sampling Control Register */
      inb(GUSP(gus, IRQSTAT));
      snd_gf1_read8(gus, 0x0f);     /* IRQ Source Register */
      spin_unlock_irqrestore(&gus->reg_lock, flags);
}

/*
 *  put selected GF1 voices to initial stage...
 */

void snd_gf1_smart_stop_voice(struct snd_gus_card * gus, unsigned short voice)
{
      unsigned long flags;

      spin_lock_irqsave(&gus->reg_lock, flags);
      snd_gf1_select_voice(gus, voice);
#if 0
      printk(KERN_DEBUG " -%i- smart stop voice - volume = 0x%x\n", voice, snd_gf1_i_read16(gus, SNDRV_GF1_VW_VOLUME));
#endif
      snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_ADDRESS_CONTROL);
      snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
      spin_unlock_irqrestore(&gus->reg_lock, flags);
}

void snd_gf1_stop_voice(struct snd_gus_card * gus, unsigned short voice)
{
      unsigned long flags;

      spin_lock_irqsave(&gus->reg_lock, flags);
      snd_gf1_select_voice(gus, voice);
#if 0
      printk(KERN_DEBUG " -%i- stop voice - volume = 0x%x\n", voice, snd_gf1_i_read16(gus, SNDRV_GF1_VW_VOLUME));
#endif
      snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_ADDRESS_CONTROL);
      snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);
      if (gus->gf1.enh_mode)
            snd_gf1_write8(gus, SNDRV_GF1_VB_ACCUMULATOR, 0);
      spin_unlock_irqrestore(&gus->reg_lock, flags);
#if 0
      snd_gf1_lfo_shutdown(gus, voice, ULTRA_LFO_VIBRATO);
      snd_gf1_lfo_shutdown(gus, voice, ULTRA_LFO_TREMOLO);
#endif
}

static void snd_gf1_clear_voices(struct snd_gus_card * gus, unsigned short v_min,
                         unsigned short v_max)
{
      unsigned long flags;
      unsigned int daddr;
      unsigned short i, w_16;

      daddr = gus->gf1.default_voice_address << 4;
      for (i = v_min; i <= v_max; i++) {
#if 0
            if (gus->gf1.syn_voices)
                  gus->gf1.syn_voices[i].flags = ~VFLG_DYNAMIC;
#endif
            spin_lock_irqsave(&gus->reg_lock, flags);
            snd_gf1_select_voice(gus, i);
            snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_ADDRESS_CONTROL); /* Voice Control Register = voice stop */
            snd_gf1_ctrl_stop(gus, SNDRV_GF1_VB_VOLUME_CONTROL);  /* Volume Ramp Control Register = ramp off */
            if (gus->gf1.enh_mode)
                  snd_gf1_write8(gus, SNDRV_GF1_VB_MODE, gus->gf1.memory ? 0x02 : 0x82);  /* Deactivate voice */
            w_16 = snd_gf1_read8(gus, SNDRV_GF1_VB_ADDRESS_CONTROL) & 0x04;
            snd_gf1_write16(gus, SNDRV_GF1_VW_FREQUENCY, 0x400);
            snd_gf1_write_addr(gus, SNDRV_GF1_VA_START, daddr, w_16);
            snd_gf1_write_addr(gus, SNDRV_GF1_VA_END, daddr, w_16);
            snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_START, 0);
            snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_END, 0);
            snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_RATE, 0);
            snd_gf1_write16(gus, SNDRV_GF1_VW_VOLUME, 0);
            snd_gf1_write_addr(gus, SNDRV_GF1_VA_CURRENT, daddr, w_16);
            snd_gf1_write8(gus, SNDRV_GF1_VB_PAN, 7);
            if (gus->gf1.enh_mode) {
                  snd_gf1_write8(gus, SNDRV_GF1_VB_ACCUMULATOR, 0);
                  snd_gf1_write16(gus, SNDRV_GF1_VW_EFFECT_VOLUME, 0);
                  snd_gf1_write16(gus, SNDRV_GF1_VW_EFFECT_VOLUME_FINAL, 0);
            }
            spin_unlock_irqrestore(&gus->reg_lock, flags);
#if 0
            snd_gf1_lfo_shutdown(gus, i, ULTRA_LFO_VIBRATO);
            snd_gf1_lfo_shutdown(gus, i, ULTRA_LFO_TREMOLO);
#endif
      }
}

void snd_gf1_stop_voices(struct snd_gus_card * gus, unsigned short v_min, unsigned short v_max)
{
      unsigned long flags;
      short i, ramp_ok;
      unsigned short ramp_end;

      if (!in_interrupt()) {  /* this can't be done in interrupt */
            for (i = v_min, ramp_ok = 0; i <= v_max; i++) {
                  spin_lock_irqsave(&gus->reg_lock, flags);
                  snd_gf1_select_voice(gus, i);
                  ramp_end = snd_gf1_read16(gus, 9) >> 8;
                  if (ramp_end > SNDRV_GF1_MIN_OFFSET) {
                        ramp_ok++;
                        snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_RATE, 20);    /* ramp rate */
                        snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_START, SNDRV_GF1_MIN_OFFSET);   /* ramp start */
                        snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_END, ramp_end);     /* ramp end */
                        snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, 0x40);     /* ramp down */
                        if (gus->gf1.enh_mode) {
                              snd_gf1_delay(gus);
                              snd_gf1_write8(gus, SNDRV_GF1_VB_VOLUME_CONTROL, 0x40);
                        }
                  }
                  spin_unlock_irqrestore(&gus->reg_lock, flags);
            }
            msleep_interruptible(50);
      }
      snd_gf1_clear_voices(gus, v_min, v_max);
}

static void snd_gf1_alloc_voice_use(struct snd_gus_card * gus, 
                            struct snd_gus_voice * pvoice,
                            int type, int client, int port)
{
      pvoice->use = 1;
      switch (type) {
      case SNDRV_GF1_VOICE_TYPE_PCM:
            gus->gf1.pcm_alloc_voices++;
            pvoice->pcm = 1;
            break;
      case SNDRV_GF1_VOICE_TYPE_SYNTH:
            pvoice->synth = 1;
            pvoice->client = client;
            pvoice->port = port;
            break;
      case SNDRV_GF1_VOICE_TYPE_MIDI:
            pvoice->midi = 1;
            pvoice->client = client;
            pvoice->port = port;
            break;
      }
}

struct snd_gus_voice *snd_gf1_alloc_voice(struct snd_gus_card * gus, int type, int client, int port)
{
      struct snd_gus_voice *pvoice;
      unsigned long flags;
      int idx;

      spin_lock_irqsave(&gus->voice_alloc, flags);
      if (type == SNDRV_GF1_VOICE_TYPE_PCM) {
            if (gus->gf1.pcm_alloc_voices >= gus->gf1.pcm_channels) {
                  spin_unlock_irqrestore(&gus->voice_alloc, flags);
                  return NULL;
            }
      }
      for (idx = 0; idx < 32; idx++) {
            pvoice = &gus->gf1.voices[idx];
            if (!pvoice->use) {
                  snd_gf1_alloc_voice_use(gus, pvoice, type, client, port);
                  spin_unlock_irqrestore(&gus->voice_alloc, flags);
                  return pvoice;
            }
      } 
      for (idx = 0; idx < 32; idx++) {
            pvoice = &gus->gf1.voices[idx];
            if (pvoice->midi && !pvoice->client) {
                  snd_gf1_clear_voices(gus, pvoice->number, pvoice->number);
                  snd_gf1_alloc_voice_use(gus, pvoice, type, client, port);
                  spin_unlock_irqrestore(&gus->voice_alloc, flags);
                  return pvoice;
            }
      } 
      spin_unlock_irqrestore(&gus->voice_alloc, flags);
      return NULL;
}

void snd_gf1_free_voice(struct snd_gus_card * gus, struct snd_gus_voice *voice)
{
      unsigned long flags;
      void (*private_free)(struct snd_gus_voice *voice);
      void *private_data;

      if (voice == NULL || !voice->use)
            return;
      snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_VOICE | voice->number);
      snd_gf1_clear_voices(gus, voice->number, voice->number);
      spin_lock_irqsave(&gus->voice_alloc, flags);
      private_free = voice->private_free;
      private_data = voice->private_data;
      voice->private_free = NULL;
      voice->private_data = NULL;
      if (voice->pcm)
            gus->gf1.pcm_alloc_voices--;
      voice->use = voice->pcm = 0;
      voice->sample_ops = NULL;
      spin_unlock_irqrestore(&gus->voice_alloc, flags);
      if (private_free)
            private_free(voice);
}

/*
 *  call this function only by start of driver
 */

int snd_gf1_start(struct snd_gus_card * gus)
{
      unsigned long flags;
      unsigned int i;

      snd_gf1_i_write8(gus, SNDRV_GF1_GB_RESET, 0);   /* reset GF1 */
      udelay(160);
      snd_gf1_i_write8(gus, SNDRV_GF1_GB_RESET, 1);   /* disable IRQ & DAC */
      udelay(160);
      snd_gf1_i_write8(gus, SNDRV_GF1_GB_JOYSTICK_DAC_LEVEL, gus->joystick_dac);

      snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_ALL);
      for (i = 0; i < 32; i++) {
            gus->gf1.voices[i].number = i;
            snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_VOICE | i);
      }

      snd_gf1_uart_cmd(gus, 0x03);  /* huh.. this cleanup took me some time... */

      if (gus->gf1.enh_mode) {      /* enhanced mode !!!! */
            snd_gf1_i_write8(gus, SNDRV_GF1_GB_GLOBAL_MODE, snd_gf1_i_look8(gus, SNDRV_GF1_GB_GLOBAL_MODE) | 0x01);
            snd_gf1_i_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
      }
      snd_gf1_clear_regs(gus);
      snd_gf1_select_active_voices(gus);
      snd_gf1_delay(gus);
      gus->gf1.default_voice_address = gus->gf1.memory > 0 ? 0 : 512 - 8;
      /* initialize LFOs & clear LFOs memory */
      if (gus->gf1.enh_mode && gus->gf1.memory) {
            gus->gf1.hw_lfo = 1;
            gus->gf1.default_voice_address += 1024;
      } else {
            gus->gf1.sw_lfo = 1;
      }
#if 0
      snd_gf1_lfo_init(gus);
#endif
      if (gus->gf1.memory > 0)
            for (i = 0; i < 4; i++)
                  snd_gf1_poke(gus, gus->gf1.default_voice_address + i, 0);
      snd_gf1_clear_regs(gus);
      snd_gf1_clear_voices(gus, 0, 31);
      snd_gf1_look_regs(gus);
      udelay(160);
      snd_gf1_i_write8(gus, SNDRV_GF1_GB_RESET, 7);   /* Reset Register = IRQ enable, DAC enable */
      udelay(160);
      snd_gf1_i_write8(gus, SNDRV_GF1_GB_RESET, 7);   /* Reset Register = IRQ enable, DAC enable */
      if (gus->gf1.enh_mode) {      /* enhanced mode !!!! */
            snd_gf1_i_write8(gus, SNDRV_GF1_GB_GLOBAL_MODE, snd_gf1_i_look8(gus, SNDRV_GF1_GB_GLOBAL_MODE) | 0x01);
            snd_gf1_i_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01);
      }
      while ((snd_gf1_i_read8(gus, SNDRV_GF1_GB_VOICES_IRQ) & 0xc0) != 0xc0);

      spin_lock_irqsave(&gus->reg_lock, flags);
      outb(gus->gf1.active_voice = 0, GUSP(gus, GF1PAGE));
      outb(gus->mix_cntrl_reg, GUSP(gus, MIXCNTRLREG));
      spin_unlock_irqrestore(&gus->reg_lock, flags);

      snd_gf1_timers_init(gus);
      snd_gf1_look_regs(gus);
      snd_gf1_mem_init(gus);
      snd_gf1_mem_proc_init(gus);
#ifdef CONFIG_SND_DEBUG
      snd_gus_irq_profile_init(gus);
#endif

#if 0
      if (gus->pnp_flag) {
            if (gus->chip.playback_fifo_size > 0)
                  snd_gf1_i_write16(gus, SNDRV_GF1_GW_FIFO_RECORD_BASE_ADDR, gus->chip.playback_fifo_block->ptr >> 8);
            if (gus->chip.record_fifo_size > 0)
                  snd_gf1_i_write16(gus, SNDRV_GF1_GW_FIFO_PLAY_BASE_ADDR, gus->chip.record_fifo_block->ptr >> 8);
            snd_gf1_i_write16(gus, SNDRV_GF1_GW_FIFO_SIZE, gus->chip.interwave_fifo_reg);
      }
#endif

      return 0;
}

/*
 *  call this function only by shutdown of driver
 */

int snd_gf1_stop(struct snd_gus_card * gus)
{
      snd_gf1_i_write8(gus, SNDRV_GF1_GB_SOUND_BLASTER_CONTROL, 0); /* stop all timers */
      snd_gf1_stop_voices(gus, 0, 31);          /* stop all voices */
      snd_gf1_i_write8(gus, SNDRV_GF1_GB_RESET, 1);   /* disable IRQ & DAC */
      snd_gf1_timers_done(gus);
      snd_gf1_mem_done(gus);
#if 0
      snd_gf1_lfo_done(gus);
#endif
      return 0;
}

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