pas2_card.c

LINUX1.0内核源代码,学习LINUX编程的一定要看。

#define _PAS2_CARD_C_
#define SND_SA_INTERRUPT
/*
 * sound/pas2_card.c
 * 
 * Detection routine for the Pro Audio Spectrum cards.
 * 
 * Copyright by Hannu Savolainen 1993
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer. 2.
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 */

#include "sound_config.h"

#if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_PAS)

#define DEFINE_TRANSLATIONS
#include "pas.h"

/*
 * The Address Translation code is used to convert I/O register addresses to
 * be relative to the given base -register
 */

int             translat_code;
static int      pas_intr_mask = 0;
static int      pas_irq = 0;

static char     pas_model;
static char    *pas_model_names[] =
{"", "Pro AudioSpectrum+", "CDPC", "Pro AudioSpectrum 16", "Pro AudioSpectrum 16D"};

/* pas_read() and pas_write() are equivalents of INB() and OUTB() */
/* These routines perform the I/O address translation required */
/* to support other than the default base address */

unsigned char
pas_read (int ioaddr)
{
  return INB (ioaddr ^ translat_code);
}

void
pas_write (unsigned char data, int ioaddr)
{
  OUTB (data, ioaddr ^ translat_code);
}

void
pas2_msg (char *foo)
{
  printk ("    PAS2: %s.\n", foo);
}

/******************* Begin of the Interrupt Handler ********************/

void
pasintr (int unused)
{
  int             status;

  status = pas_read (INTERRUPT_STATUS);
  pas_write (status, INTERRUPT_STATUS);	/* Clear interrupt */

  if (status & I_S_PCM_SAMPLE_BUFFER_IRQ)
    {
#ifndef EXCLUDE_AUDIO
      pas_pcm_interrupt (status, 1);
#endif
      status &= ~I_S_PCM_SAMPLE_BUFFER_IRQ;
    }
  if (status & I_S_MIDI_IRQ)
    {
#ifndef EXCLUDE_MIDI
#ifdef EXCLUDE_PRO_MIDI
      pas_midi_interrupt ();
#endif
#endif
      status &= ~I_S_MIDI_IRQ;
    }

}

int
pas_set_intr (int mask)
{
  int             err;

  if (!mask)
    return 0;

  if (!pas_intr_mask)
    {
      if ((err = snd_set_irq_handler (pas_irq, pasintr)) < 0)
	return err;
    }
  pas_intr_mask |= mask;

  pas_write (pas_intr_mask, INTERRUPT_MASK);
  return 0;
}

int
pas_remove_intr (int mask)
{
  if (!mask)
    return 0;

  pas_intr_mask &= ~mask;
  pas_write (pas_intr_mask, INTERRUPT_MASK);

  if (!pas_intr_mask)
    {
      snd_release_irq (pas_irq);
    }
  return 0;
}

/******************* End of the Interrupt handler **********************/

/******************* Begin of the Initialization Code ******************/

int
config_pas_hw (struct address_info *hw_config)
{
  char            ok = 1;

  pas_irq = hw_config->irq;

  pas_write (0x00, INTERRUPT_MASK);

  pas_write (0x36, SAMPLE_COUNTER_CONTROL);	/* Local timer control
						 * register */

  pas_write (0x36, SAMPLE_RATE_TIMER);	/* Sample rate timer (16 bit) */
  pas_write (0, SAMPLE_RATE_TIMER);

  pas_write (0x74, SAMPLE_COUNTER_CONTROL);	/* Local timer control
						 * register */

  pas_write (0x74, SAMPLE_BUFFER_COUNTER);	/* Sample count register (16
						 * bit) */
  pas_write (0, SAMPLE_BUFFER_COUNTER);

  pas_write (F_F_PCM_BUFFER_COUNTER | F_F_PCM_RATE_COUNTER | F_F_MIXER_UNMUTE | 1, FILTER_FREQUENCY);
  pas_write (P_C_PCM_DMA_ENABLE | P_C_PCM_MONO | P_C_PCM_DAC_MODE | P_C_MIXER_CROSS_L_TO_L | P_C_MIXER_CROSS_R_TO_R, PCM_CONTROL);
  pas_write (S_M_PCM_RESET | S_M_FM_RESET | S_M_SB_RESET | S_M_MIXER_RESET /* | S_M_OPL3_DUAL_MONO */ , SERIAL_MIXER);

  pas_write (I_C_1_BOOT_RESET_ENABLE, IO_CONFIGURATION_1);

  if (pas_irq < 0 || pas_irq > 15)
    {
      printk ("PAS2: Invalid IRQ %d", pas_irq);
      ok = 0;
    }
  else
    {
      pas_write (I_C_3_PCM_IRQ_translate[pas_irq], IO_CONFIGURATION_3);
      if (!I_C_3_PCM_IRQ_translate[pas_irq])
	{
	  printk ("PAS2: Invalid IRQ %d", pas_irq);
	  ok = 0;
	}
    }

  if (hw_config->dma < 0 || hw_config->dma > 7)
    {
      printk ("PAS2: Invalid DMA selection %d", hw_config->dma);
      ok = 0;
    }
  else
    {
      pas_write (I_C_2_PCM_DMA_translate[hw_config->dma], IO_CONFIGURATION_2);
      if (!I_C_2_PCM_DMA_translate[hw_config->dma])
	{
	  printk ("PAS2: Invalid DMA selection %d", hw_config->dma);
	  ok = 0;
	}
    }
  
/*
 * This fixes the timing problems of the PAS due to the Symphony chipset
 * as per Media Vision.  Only define this if your PAS doesn't work correctly.
 */
#ifdef SYMPHONY_PAS
	OUTB(0x05,0xa8);
	OUTB(0x60,0xa9);
#endif

#ifdef BROKEN_BUS_CLOCK
  pas_write (S_C_1_PCS_ENABLE | S_C_1_PCS_STEREO | S_C_1_PCS_REALSOUND | S_C_1_FM_EMULATE_CLOCK, SYSTEM_CONFIGURATION_1);
#else
  /* pas_write(S_C_1_PCS_ENABLE, SYSTEM_CONFIGURATION_1);     */
  pas_write (S_C_1_PCS_ENABLE | S_C_1_PCS_STEREO | S_C_1_PCS_REALSOUND, SYSTEM_CONFIGURATION_1);
#endif
  pas_write (0x18, SYSTEM_CONFIGURATION_3);	/* ??? */

  pas_write (F_F_MIXER_UNMUTE | 0x01, FILTER_FREQUENCY);	/* Sets mute off and
								 * selects filter rate
								 * of 17.897 kHz */

  if (pas_model == PAS_16 || pas_model == PAS_16D)
    pas_write (8, PRESCALE_DIVIDER);
  else
    pas_write (0, PRESCALE_DIVIDER);

  pas_write (P_M_MV508_ADDRESS | 5, PARALLEL_MIXER);
  pas_write (5, PARALLEL_MIXER);

#if !defined(EXCLUDE_SB_EMULATION) || !defined(EXCLUDE_SB)

    {
	struct address_info *sb_config;

	if ((sb_config=sound_getconf(SNDCARD_SB)))
        {
		unsigned char irq_dma;

  /* Turn on Sound Blaster compatibility */
  /* bit 1 = SB emulation */
  /* bit 0 = MPU401 emulation (CDPC only :-( ) */
  pas_write (0x02, COMPATIBILITY_ENABLE);

  /* "Emulation address"	 */
            pas_write ((sb_config->io_base >> 4) & 0x0f, EMULATION_ADDRESS);

	    if (!E_C_SB_DMA_translate[sb_config->dma]) 
               printk("\n\nPAS16 Warning: Invalid SB DMA %d\n\n",
			sb_config->dma);

	    if (!E_C_SB_IRQ_translate[sb_config->irq]) 
               printk("\n\nPAS16 Warning: Invalid SB IRQ %d\n\n",
			sb_config->irq);

	    irq_dma = E_C_SB_DMA_translate[sb_config->dma] | 
		      E_C_SB_IRQ_translate[sb_config->irq];

	    pas_write(irq_dma, EMULATION_CONFIGURATION);
        }
   }
#endif

  if (!ok)
    pas2_msg ("Driver not enabled");

  return ok;
}

int
detect_pas_hw (struct address_info *hw_config)
{
  unsigned char   board_id, foo;

  /*
   * WARNING: Setting an option like W:1 or so that disables warm boot reset
   * of the card will screw up this detect code something fierce. Adding code
   * to handle this means possibly interfering with other cards on the bus if
   * you have something on base port 0x388. SO be forewarned.
   */

  OUTB (0xBC, MASTER_DECODE);	/* Talk to first board */
  OUTB (hw_config->io_base >> 2, MASTER_DECODE);	/* Set base address */
  translat_code = PAS_DEFAULT_BASE ^ hw_config->io_base;
  pas_write (1, WAIT_STATE);	/* One wait-state */

  board_id = pas_read (INTERRUPT_MASK);

  if (board_id == 0xff)
    return 0;

  /*
   * We probably have a PAS-series board, now check for a PAS2-series board
   * by trying to change the board revision bits. PAS2-series hardware won't
   * let you do this - the bits are read-only.
   */

  foo = board_id ^ 0xe0;

  pas_write (foo, INTERRUPT_MASK);
  foo = INB (INTERRUPT_MASK);
  pas_write (board_id, INTERRUPT_MASK);

  if (board_id != foo)		/* Not a PAS2 */
    return 0;

  pas_model = O_M_1_to_card[pas_read (OPERATION_MODE_1) & 0x0f];

  return pas_model;
}

long
attach_pas_card (long mem_start, struct address_info *hw_config)
{
  pas_irq = hw_config->irq;

  if (detect_pas_hw (hw_config))
    {

      if ((pas_model = O_M_1_to_card[pas_read (OPERATION_MODE_1) & 0x0f]))
	{
	  printk (" <%s rev %d>", pas_model_names[(int) pas_model], pas_read (BOARD_REV_ID));
	}

      if (config_pas_hw (hw_config))
	{

#ifndef EXCLUDE_AUDIO
	  mem_start = pas_pcm_init (mem_start, hw_config);
#endif

# if !defined(EXCLUDE_SB_EMULATION) && !defined(EXCLUDE_SB)

	  sb_dsp_disable_midi ();	/* The SB emulation don't support
					 * midi */
# endif

#ifndef EXCLUDE_YM3812
	  enable_opl3_mode (0x388, 0x38a, 0);
#endif

#ifndef EXCLUDE_MIDI
#ifdef EXCLUDE_PRO_MIDI
	  mem_start = pas_midi_init (mem_start);
#endif
#endif

	  pas_init_mixer ();
	}
    }

  return mem_start;
}

int
probe_pas (struct address_info *hw_config)
{
  return detect_pas_hw (hw_config);
}

#endif