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gus_dma.c

/*
 *  Routines for GF1 DMA control
 *  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 <asm/dma.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/gus.h>

static void snd_gf1_dma_ack(struct snd_gus_card * gus)
{
      unsigned long flags;

      spin_lock_irqsave(&gus->reg_lock, flags);
      snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, 0x00);
      snd_gf1_look8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL);
      spin_unlock_irqrestore(&gus->reg_lock, flags);
}

static void snd_gf1_dma_program(struct snd_gus_card * gus,
                        unsigned int addr,
                        unsigned long buf_addr,
                        unsigned int count,
                        unsigned int cmd)
{
      unsigned long flags;
      unsigned int address;
      unsigned char dma_cmd;
      unsigned int address_high;

      // snd_printk("dma_transfer: addr=0x%x, buf=0x%lx, count=0x%x\n", addr, (long) buf, count);

      if (gus->gf1.dma1 > 3) {
            if (gus->gf1.enh_mode) {
                  address = addr >> 1;
            } else {
                  if (addr & 0x1f) {
                        snd_printd("snd_gf1_dma_transfer: unaligned address (0x%x)?\n", addr);
                        return;
                  }
                  address = (addr & 0x000c0000) | ((addr & 0x0003ffff) >> 1);
            }
      } else {
            address = addr;
      }

      dma_cmd = SNDRV_GF1_DMA_ENABLE | (unsigned short) cmd;
#if 0
      dma_cmd |= 0x08;
#endif
      if (dma_cmd & SNDRV_GF1_DMA_16BIT) {
            count++;
            count &= ~1;      /* align */
      }
      if (gus->gf1.dma1 > 3) {
            dma_cmd |= SNDRV_GF1_DMA_WIDTH16;
            count++;
            count &= ~1;      /* align */
      }
      snd_gf1_dma_ack(gus);
      snd_dma_program(gus->gf1.dma1, buf_addr, count, dma_cmd & SNDRV_GF1_DMA_READ ? DMA_MODE_READ : DMA_MODE_WRITE);
#if 0
      snd_printk("address = 0x%x, count = 0x%x, dma_cmd = 0x%x\n", address << 1, count, dma_cmd);
#endif
      spin_lock_irqsave(&gus->reg_lock, flags);
      if (gus->gf1.enh_mode) {
            address_high = ((address >> 16) & 0x000000f0) | (address & 0x0000000f);
            snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4));
            snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_HIGH, (unsigned char) address_high);
      } else
            snd_gf1_write16(gus, SNDRV_GF1_GW_DRAM_DMA_LOW, (unsigned short) (address >> 4));
      snd_gf1_write8(gus, SNDRV_GF1_GB_DRAM_DMA_CONTROL, dma_cmd);
      spin_unlock_irqrestore(&gus->reg_lock, flags);
}

static struct snd_gf1_dma_block *snd_gf1_dma_next_block(struct snd_gus_card * gus)
{
      struct snd_gf1_dma_block *block;

      /* PCM block have bigger priority than synthesizer one */
      if (gus->gf1.dma_data_pcm) {
            block = gus->gf1.dma_data_pcm;
            if (gus->gf1.dma_data_pcm_last == block) {
                  gus->gf1.dma_data_pcm =
                  gus->gf1.dma_data_pcm_last = NULL;
            } else {
                  gus->gf1.dma_data_pcm = block->next;
            }
      } else if (gus->gf1.dma_data_synth) {
            block = gus->gf1.dma_data_synth;
            if (gus->gf1.dma_data_synth_last == block) {
                  gus->gf1.dma_data_synth =
                  gus->gf1.dma_data_synth_last = NULL;
            } else {
                  gus->gf1.dma_data_synth = block->next;
            }
      } else {
            block = NULL;
      }
      if (block) {
            gus->gf1.dma_ack = block->ack;
            gus->gf1.dma_private_data = block->private_data;
      }
      return block;
}


static void snd_gf1_dma_interrupt(struct snd_gus_card * gus)
{
      struct snd_gf1_dma_block *block;

      snd_gf1_dma_ack(gus);
      if (gus->gf1.dma_ack)
            gus->gf1.dma_ack(gus, gus->gf1.dma_private_data);
      spin_lock(&gus->dma_lock);
      if (gus->gf1.dma_data_pcm == NULL &&
          gus->gf1.dma_data_synth == NULL) {
            gus->gf1.dma_ack = NULL;
            gus->gf1.dma_flags &= ~SNDRV_GF1_DMA_TRIGGER;
            spin_unlock(&gus->dma_lock);
            return;
      }
      block = snd_gf1_dma_next_block(gus);
      spin_unlock(&gus->dma_lock);
      snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd);
      kfree(block);
#if 0
      printk("program dma (IRQ) - addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", addr, (long) buffer, count, cmd);
#endif
}

int snd_gf1_dma_init(struct snd_gus_card * gus)
{
      mutex_lock(&gus->dma_mutex);
      gus->gf1.dma_shared++;
      if (gus->gf1.dma_shared > 1) {
            mutex_unlock(&gus->dma_mutex);
            return 0;
      }
      gus->gf1.interrupt_handler_dma_write = snd_gf1_dma_interrupt;
      gus->gf1.dma_data_pcm = 
      gus->gf1.dma_data_pcm_last =
      gus->gf1.dma_data_synth = 
      gus->gf1.dma_data_synth_last = NULL;
      mutex_unlock(&gus->dma_mutex);
      return 0;
}

int snd_gf1_dma_done(struct snd_gus_card * gus)
{
      struct snd_gf1_dma_block *block;

      mutex_lock(&gus->dma_mutex);
      gus->gf1.dma_shared--;
      if (!gus->gf1.dma_shared) {
            snd_dma_disable(gus->gf1.dma1);
            snd_gf1_set_default_handlers(gus, SNDRV_GF1_HANDLER_DMA_WRITE);
            snd_gf1_dma_ack(gus);
            while ((block = gus->gf1.dma_data_pcm)) {
                  gus->gf1.dma_data_pcm = block->next;
                  kfree(block);
            }
            while ((block = gus->gf1.dma_data_synth)) {
                  gus->gf1.dma_data_synth = block->next;
                  kfree(block);
            }
            gus->gf1.dma_data_pcm_last =
            gus->gf1.dma_data_synth_last = NULL;
      }
      mutex_unlock(&gus->dma_mutex);
      return 0;
}

int snd_gf1_dma_transfer_block(struct snd_gus_card * gus,
                         struct snd_gf1_dma_block * __block,
                         int atomic,
                         int synth)
{
      unsigned long flags;
      struct snd_gf1_dma_block *block;

      block = kmalloc(sizeof(*block), atomic ? GFP_ATOMIC : GFP_KERNEL);
      if (block == NULL) {
            snd_printk(KERN_ERR "gf1: DMA transfer failure; not enough memory\n");
            return -ENOMEM;
      }
      *block = *__block;
      block->next = NULL;
#if 0
      printk("addr = 0x%x, buffer = 0x%lx, count = 0x%x, cmd = 0x%x\n", block->addr, (long) block->buffer, block->count, block->cmd);
#endif
#if 0
      printk("gus->gf1.dma_data_pcm_last = 0x%lx\n", (long)gus->gf1.dma_data_pcm_last);
      printk("gus->gf1.dma_data_pcm = 0x%lx\n", (long)gus->gf1.dma_data_pcm);
#endif
      spin_lock_irqsave(&gus->dma_lock, flags);
      if (synth) {
            if (gus->gf1.dma_data_synth_last) {
                  gus->gf1.dma_data_synth_last->next = block;
                  gus->gf1.dma_data_synth_last = block;
            } else {
                  gus->gf1.dma_data_synth = 
                  gus->gf1.dma_data_synth_last = block;
            }
      } else {
            if (gus->gf1.dma_data_pcm_last) {
                  gus->gf1.dma_data_pcm_last->next = block;
                  gus->gf1.dma_data_pcm_last = block;
            } else {
                  gus->gf1.dma_data_pcm = 
                  gus->gf1.dma_data_pcm_last = block;
            }
      }
      if (!(gus->gf1.dma_flags & SNDRV_GF1_DMA_TRIGGER)) {
            gus->gf1.dma_flags |= SNDRV_GF1_DMA_TRIGGER;
            block = snd_gf1_dma_next_block(gus);
            spin_unlock_irqrestore(&gus->dma_lock, flags);
            if (block == NULL)
                  return 0;
            snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd);
            kfree(block);
            return 0;
      }
      spin_unlock_irqrestore(&gus->dma_lock, flags);
      return 0;
}

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