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io.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *                   Creative Labs, Inc.
 *  Routines for control of EMU10K1 chips
 *
 *  BUGS:
 *    --
 *
 *  TODO:
 *    --
 *
 *   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/time.h>
#include <sound/core.h>
#include <sound/emu10k1.h>
#include <linux/delay.h>

unsigned int snd_emu10k1_ptr_read(struct snd_emu10k1 * emu, unsigned int reg, unsigned int chn)
{
      unsigned long flags;
      unsigned int regptr, val;
      unsigned int mask;

      mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK;
      regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK);

      if (reg & 0xff000000) {
            unsigned char size, offset;
            
            size = (reg >> 24) & 0x3f;
            offset = (reg >> 16) & 0x1f;
            mask = ((1 << size) - 1) << offset;
            
            spin_lock_irqsave(&emu->emu_lock, flags);
            outl(regptr, emu->port + PTR);
            val = inl(emu->port + DATA);
            spin_unlock_irqrestore(&emu->emu_lock, flags);
            
            return (val & mask) >> offset;
      } else {
            spin_lock_irqsave(&emu->emu_lock, flags);
            outl(regptr, emu->port + PTR);
            val = inl(emu->port + DATA);
            spin_unlock_irqrestore(&emu->emu_lock, flags);
            return val;
      }
}

EXPORT_SYMBOL(snd_emu10k1_ptr_read);

void snd_emu10k1_ptr_write(struct snd_emu10k1 *emu, unsigned int reg, unsigned int chn, unsigned int data)
{
      unsigned int regptr;
      unsigned long flags;
      unsigned int mask;

      mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK;
      regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK);

      if (reg & 0xff000000) {
            unsigned char size, offset;

            size = (reg >> 24) & 0x3f;
            offset = (reg >> 16) & 0x1f;
            mask = ((1 << size) - 1) << offset;
            data = (data << offset) & mask;

            spin_lock_irqsave(&emu->emu_lock, flags);
            outl(regptr, emu->port + PTR);
            data |= inl(emu->port + DATA) & ~mask;
            outl(data, emu->port + DATA);
            spin_unlock_irqrestore(&emu->emu_lock, flags);        
      } else {
            spin_lock_irqsave(&emu->emu_lock, flags);
            outl(regptr, emu->port + PTR);
            outl(data, emu->port + DATA);
            spin_unlock_irqrestore(&emu->emu_lock, flags);
      }
}

EXPORT_SYMBOL(snd_emu10k1_ptr_write);

unsigned int snd_emu10k1_ptr20_read(struct snd_emu10k1 * emu, 
                                unsigned int reg, 
                                unsigned int chn)
{
      unsigned long flags;
      unsigned int regptr, val;
  
      regptr = (reg << 16) | chn;

      spin_lock_irqsave(&emu->emu_lock, flags);
      outl(regptr, emu->port + 0x20 + PTR);
      val = inl(emu->port + 0x20 + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
      return val;
}

void snd_emu10k1_ptr20_write(struct snd_emu10k1 *emu, 
                           unsigned int reg, 
                           unsigned int chn, 
                           unsigned int data)
{
      unsigned int regptr;
      unsigned long flags;

      regptr = (reg << 16) | chn;

      spin_lock_irqsave(&emu->emu_lock, flags);
      outl(regptr, emu->port + 0x20 + PTR);
      outl(data, emu->port + 0x20 + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

int snd_emu10k1_spi_write(struct snd_emu10k1 * emu,
                           unsigned int data)
{
      unsigned int reset, set;
      unsigned int reg, tmp;
      int n, result;
      if (emu->card_capabilities->ca0108_chip)
            reg = 0x3c; /* PTR20, reg 0x3c */
      else {
            /* For other chip types the SPI register
             * is currently unknown. */
            return 1;
      }
      if (data > 0xffff) /* Only 16bit values allowed */
            return 1;

      tmp = snd_emu10k1_ptr20_read(emu, reg, 0);
      reset = (tmp & ~0x3ffff) | 0x20000; /* Set xxx20000 */
      set = reset | 0x10000; /* Set xxx1xxxx */
      snd_emu10k1_ptr20_write(emu, reg, 0, reset | data);
      tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* write post */
      snd_emu10k1_ptr20_write(emu, reg, 0, set | data);
      result = 1;
      /* Wait for status bit to return to 0 */
      for (n = 0; n < 100; n++) {
            udelay(10);
            tmp = snd_emu10k1_ptr20_read(emu, reg, 0);
            if (!(tmp & 0x10000)) {
                  result = 0;
                  break;
            }
      }
      if (result) /* Timed out */
            return 1;
      snd_emu10k1_ptr20_write(emu, reg, 0, reset | data);
      tmp = snd_emu10k1_ptr20_read(emu, reg, 0); /* Write post */
      return 0;
}

void snd_emu10k1_intr_enable(struct snd_emu10k1 *emu, unsigned int intrenb)
{
      unsigned long flags;
      unsigned int enable;

      spin_lock_irqsave(&emu->emu_lock, flags);
      enable = inl(emu->port + INTE) | intrenb;
      outl(enable, emu->port + INTE);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_intr_disable(struct snd_emu10k1 *emu, unsigned int intrenb)
{
      unsigned long flags;
      unsigned int enable;

      spin_lock_irqsave(&emu->emu_lock, flags);
      enable = inl(emu->port + INTE) & ~intrenb;
      outl(enable, emu->port + INTE);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_voice_intr_enable(struct snd_emu10k1 *emu, unsigned int voicenum)
{
      unsigned long flags;
      unsigned int val;

      spin_lock_irqsave(&emu->emu_lock, flags);
      /* voice interrupt */
      if (voicenum >= 32) {
            outl(CLIEH << 16, emu->port + PTR);
            val = inl(emu->port + DATA);
            val |= 1 << (voicenum - 32);
      } else {
            outl(CLIEL << 16, emu->port + PTR);
            val = inl(emu->port + DATA);
            val |= 1 << voicenum;
      }
      outl(val, emu->port + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_voice_intr_disable(struct snd_emu10k1 *emu, unsigned int voicenum)
{
      unsigned long flags;
      unsigned int val;

      spin_lock_irqsave(&emu->emu_lock, flags);
      /* voice interrupt */
      if (voicenum >= 32) {
            outl(CLIEH << 16, emu->port + PTR);
            val = inl(emu->port + DATA);
            val &= ~(1 << (voicenum - 32));
      } else {
            outl(CLIEL << 16, emu->port + PTR);
            val = inl(emu->port + DATA);
            val &= ~(1 << voicenum);
      }
      outl(val, emu->port + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_voice_intr_ack(struct snd_emu10k1 *emu, unsigned int voicenum)
{
      unsigned long flags;

      spin_lock_irqsave(&emu->emu_lock, flags);
      /* voice interrupt */
      if (voicenum >= 32) {
            outl(CLIPH << 16, emu->port + PTR);
            voicenum = 1 << (voicenum - 32);
      } else {
            outl(CLIPL << 16, emu->port + PTR);
            voicenum = 1 << voicenum;
      }
      outl(voicenum, emu->port + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_voice_half_loop_intr_enable(struct snd_emu10k1 *emu, unsigned int voicenum)
{
      unsigned long flags;
      unsigned int val;

      spin_lock_irqsave(&emu->emu_lock, flags);
      /* voice interrupt */
      if (voicenum >= 32) {
            outl(HLIEH << 16, emu->port + PTR);
            val = inl(emu->port + DATA);
            val |= 1 << (voicenum - 32);
      } else {
            outl(HLIEL << 16, emu->port + PTR);
            val = inl(emu->port + DATA);
            val |= 1 << voicenum;
      }
      outl(val, emu->port + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_voice_half_loop_intr_disable(struct snd_emu10k1 *emu, unsigned int voicenum)
{
      unsigned long flags;
      unsigned int val;

      spin_lock_irqsave(&emu->emu_lock, flags);
      /* voice interrupt */
      if (voicenum >= 32) {
            outl(HLIEH << 16, emu->port + PTR);
            val = inl(emu->port + DATA);
            val &= ~(1 << (voicenum - 32));
      } else {
            outl(HLIEL << 16, emu->port + PTR);
            val = inl(emu->port + DATA);
            val &= ~(1 << voicenum);
      }
      outl(val, emu->port + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_voice_half_loop_intr_ack(struct snd_emu10k1 *emu, unsigned int voicenum)
{
      unsigned long flags;

      spin_lock_irqsave(&emu->emu_lock, flags);
      /* voice interrupt */
      if (voicenum >= 32) {
            outl(HLIPH << 16, emu->port + PTR);
            voicenum = 1 << (voicenum - 32);
      } else {
            outl(HLIPL << 16, emu->port + PTR);
            voicenum = 1 << voicenum;
      }
      outl(voicenum, emu->port + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_voice_set_loop_stop(struct snd_emu10k1 *emu, unsigned int voicenum)
{
      unsigned long flags;
      unsigned int sol;

      spin_lock_irqsave(&emu->emu_lock, flags);
      /* voice interrupt */
      if (voicenum >= 32) {
            outl(SOLEH << 16, emu->port + PTR);
            sol = inl(emu->port + DATA);
            sol |= 1 << (voicenum - 32);
      } else {
            outl(SOLEL << 16, emu->port + PTR);
            sol = inl(emu->port + DATA);
            sol |= 1 << voicenum;
      }
      outl(sol, emu->port + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_voice_clear_loop_stop(struct snd_emu10k1 *emu, unsigned int voicenum)
{
      unsigned long flags;
      unsigned int sol;

      spin_lock_irqsave(&emu->emu_lock, flags);
      /* voice interrupt */
      if (voicenum >= 32) {
            outl(SOLEH << 16, emu->port + PTR);
            sol = inl(emu->port + DATA);
            sol &= ~(1 << (voicenum - 32));
      } else {
            outl(SOLEL << 16, emu->port + PTR);
            sol = inl(emu->port + DATA);
            sol &= ~(1 << voicenum);
      }
      outl(sol, emu->port + DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

void snd_emu10k1_wait(struct snd_emu10k1 *emu, unsigned int wait)
{
      volatile unsigned count;
      unsigned int newtime = 0, curtime;

      curtime = inl(emu->port + WC) >> 6;
      while (wait-- > 0) {
            count = 0;
            while (count++ < 16384) {
                  newtime = inl(emu->port + WC) >> 6;
                  if (newtime != curtime)
                        break;
            }
            if (count >= 16384)
                  break;
            curtime = newtime;
      }
}

unsigned short snd_emu10k1_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
      struct snd_emu10k1 *emu = ac97->private_data;
      unsigned long flags;
      unsigned short val;

      spin_lock_irqsave(&emu->emu_lock, flags);
      outb(reg, emu->port + AC97ADDRESS);
      val = inw(emu->port + AC97DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
      return val;
}

void snd_emu10k1_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short data)
{
      struct snd_emu10k1 *emu = ac97->private_data;
      unsigned long flags;

      spin_lock_irqsave(&emu->emu_lock, flags);
      outb(reg, emu->port + AC97ADDRESS);
      outw(data, emu->port + AC97DATA);
      spin_unlock_irqrestore(&emu->emu_lock, flags);
}

/*
 *  convert rate to pitch
 */

unsigned int snd_emu10k1_rate_to_pitch(unsigned int rate)
{
      static u32 logMagTable[128] = {
            0x00000, 0x02dfc, 0x05b9e, 0x088e6, 0x0b5d6, 0x0e26f, 0x10eb3, 0x13aa2,
            0x1663f, 0x1918a, 0x1bc84, 0x1e72e, 0x2118b, 0x23b9a, 0x2655d, 0x28ed5,
            0x2b803, 0x2e0e8, 0x30985, 0x331db, 0x359eb, 0x381b6, 0x3a93d, 0x3d081,
            0x3f782, 0x41e42, 0x444c1, 0x46b01, 0x49101, 0x4b6c4, 0x4dc49, 0x50191,
            0x5269e, 0x54b6f, 0x57006, 0x59463, 0x5b888, 0x5dc74, 0x60029, 0x623a7,
            0x646ee, 0x66a00, 0x68cdd, 0x6af86, 0x6d1fa, 0x6f43c, 0x7164b, 0x73829,
            0x759d4, 0x77b4f, 0x79c9a, 0x7bdb5, 0x7dea1, 0x7ff5e, 0x81fed, 0x8404e,
            0x86082, 0x88089, 0x8a064, 0x8c014, 0x8df98, 0x8fef1, 0x91e20, 0x93d26,
            0x95c01, 0x97ab4, 0x9993e, 0x9b79f, 0x9d5d9, 0x9f3ec, 0xa11d8, 0xa2f9d,
            0xa4d3c, 0xa6ab5, 0xa8808, 0xaa537, 0xac241, 0xadf26, 0xafbe7, 0xb1885,
            0xb3500, 0xb5157, 0xb6d8c, 0xb899f, 0xba58f, 0xbc15e, 0xbdd0c, 0xbf899,
            0xc1404, 0xc2f50, 0xc4a7b, 0xc6587, 0xc8073, 0xc9b3f, 0xcb5ed, 0xcd07c,
            0xceaec, 0xd053f, 0xd1f73, 0xd398a, 0xd5384, 0xd6d60, 0xd8720, 0xda0c3,
            0xdba4a, 0xdd3b4, 0xded03, 0xe0636, 0xe1f4e, 0xe384a, 0xe512c, 0xe69f3,
            0xe829f, 0xe9b31, 0xeb3a9, 0xecc08, 0xee44c, 0xefc78, 0xf148a, 0xf2c83,
            0xf4463, 0xf5c2a, 0xf73da, 0xf8b71, 0xfa2f0, 0xfba57, 0xfd1a7, 0xfe8df
      };
      static char logSlopeTable[128] = {
            0x5c, 0x5c, 0x5b, 0x5a, 0x5a, 0x59, 0x58, 0x58,
            0x57, 0x56, 0x56, 0x55, 0x55, 0x54, 0x53, 0x53,
            0x52, 0x52, 0x51, 0x51, 0x50, 0x50, 0x4f, 0x4f,
            0x4e, 0x4d, 0x4d, 0x4d, 0x4c, 0x4c, 0x4b, 0x4b,
            0x4a, 0x4a, 0x49, 0x49, 0x48, 0x48, 0x47, 0x47,
            0x47, 0x46, 0x46, 0x45, 0x45, 0x45, 0x44, 0x44,
            0x43, 0x43, 0x43, 0x42, 0x42, 0x42, 0x41, 0x41,
            0x41, 0x40, 0x40, 0x40, 0x3f, 0x3f, 0x3f, 0x3e,
            0x3e, 0x3e, 0x3d, 0x3d, 0x3d, 0x3c, 0x3c, 0x3c,
            0x3b, 0x3b, 0x3b, 0x3b, 0x3a, 0x3a, 0x3a, 0x39,
            0x39, 0x39, 0x39, 0x38, 0x38, 0x38, 0x38, 0x37,
            0x37, 0x37, 0x37, 0x36, 0x36, 0x36, 0x36, 0x35,
            0x35, 0x35, 0x35, 0x34, 0x34, 0x34, 0x34, 0x34,
            0x33, 0x33, 0x33, 0x33, 0x32, 0x32, 0x32, 0x32,
            0x32, 0x31, 0x31, 0x31, 0x31, 0x31, 0x30, 0x30,
            0x30, 0x30, 0x30, 0x2f, 0x2f, 0x2f, 0x2f, 0x2f
      };
      int i;

      if (rate == 0)
            return 0;   /* Bail out if no leading "1" */
      rate *= 11185;          /* Scale 48000 to 0x20002380 */
      for (i = 31; i > 0; i--) {
            if (rate & 0x80000000) {      /* Detect leading "1" */
                  return (((unsigned int) (i - 15) << 20) +
                         logMagTable[0x7f & (rate >> 24)] +
                              (0x7f & (rate >> 17)) *
                              logSlopeTable[0x7f & (rate >> 24)]);
            }
            rate <<= 1;
      }

      return 0;         /* Should never reach this point */
}


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