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vxp_ops.c

/*
 * Driver for Digigram VXpocket soundcards
 *
 * lowlevel routines for VXpocket soundcards
 *
 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de>
 *
 *   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/device.h>
#include <linux/firmware.h>
#include <sound/core.h>
#include <asm/io.h>
#include "vxpocket.h"


static int vxp_reg_offset[VX_REG_MAX] = {
      [VX_ICR]    = 0x00,           // ICR
      [VX_CVR]    = 0x01,           // CVR
      [VX_ISR]    = 0x02,           // ISR
      [VX_IVR]    = 0x03,           // IVR
      [VX_RXH]    = 0x05,           // RXH
      [VX_RXM]    = 0x06,           // RXM
      [VX_RXL]    = 0x07,           // RXL
      [VX_DMA]    = 0x04,           // DMA
      [VX_CDSP]   = 0x08,           // CDSP
      [VX_LOFREQ] = 0x09,           // LFREQ
      [VX_HIFREQ] = 0x0a,           // HFREQ
      [VX_DATA]   = 0x0b,           // DATA
      [VX_MICRO]  = 0x0c,           // MICRO
      [VX_DIALOG] = 0x0d,           // DIALOG
      [VX_CSUER]  = 0x0e,           // CSUER
      [VX_RUER]   = 0x0f,           // RUER
};


static inline unsigned long vxp_reg_addr(struct vx_core *_chip, int reg)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;
      return chip->port + vxp_reg_offset[reg];
}

/*
 * snd_vx_inb - read a byte from the register
 * @offset: register offset
 */
static unsigned char vxp_inb(struct vx_core *chip, int offset)
{
      return inb(vxp_reg_addr(chip, offset));
}

/*
 * snd_vx_outb - write a byte on the register
 * @offset: the register offset
 * @val: the value to write
 */
static void vxp_outb(struct vx_core *chip, int offset, unsigned char val)
{
      outb(val, vxp_reg_addr(chip, offset));
}

/*
 * redefine macros to call directly
 */
#undef vx_inb
#define vx_inb(chip,reg)      vxp_inb((struct vx_core *)(chip), VX_##reg)
#undef vx_outb
#define vx_outb(chip,reg,val) vxp_outb((struct vx_core *)(chip), VX_##reg,val)


/*
 * vx_check_magic - check the magic word on xilinx
 *
 * returns zero if a magic word is detected, or a negative error code.
 */
static int vx_check_magic(struct vx_core *chip)
{
      unsigned long end_time = jiffies + HZ / 5;
      int c;
      do {
            c = vx_inb(chip, CDSP);
            if (c == CDSP_MAGIC)
                  return 0;
            msleep(10);
      } while (time_after_eq(end_time, jiffies));
      snd_printk(KERN_ERR "cannot find xilinx magic word (%x)\n", c);
      return -EIO;
}


/*
 * vx_reset_dsp - reset the DSP
 */

#define XX_DSP_RESET_WAIT_TIME            2     /* ms */

static void vxp_reset_dsp(struct vx_core *_chip)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;

      /* set the reset dsp bit to 1 */
      vx_outb(chip, CDSP, chip->regCDSP | VXP_CDSP_DSP_RESET_MASK);
      vx_inb(chip, CDSP);
      mdelay(XX_DSP_RESET_WAIT_TIME);
      /* reset the bit */
      chip->regCDSP &= ~VXP_CDSP_DSP_RESET_MASK;
      vx_outb(chip, CDSP, chip->regCDSP);
      vx_inb(chip, CDSP);
      mdelay(XX_DSP_RESET_WAIT_TIME);
}

/*
 * reset codec bit
 */
static void vxp_reset_codec(struct vx_core *_chip)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;

      /* Set the reset CODEC bit to 1. */
      vx_outb(chip, CDSP, chip->regCDSP | VXP_CDSP_CODEC_RESET_MASK);
      vx_inb(chip, CDSP);
      msleep(10);
      /* Set the reset CODEC bit to 0. */
      chip->regCDSP &= ~VXP_CDSP_CODEC_RESET_MASK;
      vx_outb(chip, CDSP, chip->regCDSP);
      vx_inb(chip, CDSP);
      msleep(1);
}

/*
 * vx_load_xilinx_binary - load the xilinx binary image
 * the binary image is the binary array converted from the bitstream file.
 */
static int vxp_load_xilinx_binary(struct vx_core *_chip, const struct firmware *fw)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;
      unsigned int i;
      int c;
      int regCSUER, regRUER;
      unsigned char *image;
      unsigned char data;

      /* Switch to programmation mode */
      chip->regDIALOG |= VXP_DLG_XILINX_REPROG_MASK;
      vx_outb(chip, DIALOG, chip->regDIALOG);

      /* Save register CSUER and RUER */
      regCSUER = vx_inb(chip, CSUER);
      regRUER = vx_inb(chip, RUER);

      /* reset HF0 and HF1 */
      vx_outb(chip, ICR, 0);

      /* Wait for answer HF2 equal to 1 */
      snd_printdd(KERN_DEBUG "check ISR_HF2\n");
      if (vx_check_isr(_chip, ISR_HF2, ISR_HF2, 20) < 0)
            goto _error;

      /* set HF1 for loading xilinx binary */
      vx_outb(chip, ICR, ICR_HF1);
      image = fw->data;
      for (i = 0; i < fw->size; i++, image++) {
            data = *image;
            if (vx_wait_isr_bit(_chip, ISR_TX_EMPTY) < 0)
                  goto _error;
            vx_outb(chip, TXL, data);
            /* wait for reading */
            if (vx_wait_for_rx_full(_chip) < 0)
                  goto _error;
            c = vx_inb(chip, RXL);
            if (c != (int)data)
                  snd_printk(KERN_ERR "vxpocket: load xilinx mismatch at %d: 0x%x != 0x%x\n", i, c, (int)data);
        }

      /* reset HF1 */
      vx_outb(chip, ICR, 0);

      /* wait for HF3 */
      if (vx_check_isr(_chip, ISR_HF3, ISR_HF3, 20) < 0)
            goto _error;

      /* read the number of bytes received */
      if (vx_wait_for_rx_full(_chip) < 0)
            goto _error;

      c = (int)vx_inb(chip, RXH) << 16;
      c |= (int)vx_inb(chip, RXM) << 8;
      c |= vx_inb(chip, RXL);

      snd_printdd(KERN_DEBUG "xilinx: dsp size received 0x%x, orig 0x%Zx\n", c, fw->size);

      vx_outb(chip, ICR, ICR_HF0);

      /* TEMPO 250ms : wait until Xilinx is downloaded */
      msleep(300);

      /* test magical word */
      if (vx_check_magic(_chip) < 0)
            goto _error;

      /* Restore register 0x0E and 0x0F (thus replacing COR and FCSR) */
      vx_outb(chip, CSUER, regCSUER);
      vx_outb(chip, RUER, regRUER);

      /* Reset the Xilinx's signal enabling IO access */
      chip->regDIALOG |= VXP_DLG_XILINX_REPROG_MASK;
      vx_outb(chip, DIALOG, chip->regDIALOG);
      vx_inb(chip, DIALOG);
      msleep(10);
      chip->regDIALOG &= ~VXP_DLG_XILINX_REPROG_MASK;
      vx_outb(chip, DIALOG, chip->regDIALOG);
      vx_inb(chip, DIALOG);

      /* Reset of the Codec */
      vxp_reset_codec(_chip);
      vx_reset_dsp(_chip);

      return 0;

 _error:
      vx_outb(chip, CSUER, regCSUER);
      vx_outb(chip, RUER, regRUER);
      chip->regDIALOG &= ~VXP_DLG_XILINX_REPROG_MASK;
      vx_outb(chip, DIALOG, chip->regDIALOG);
      return -EIO;
}


/*
 * vxp_load_dsp - load_dsp callback
 */
static int vxp_load_dsp(struct vx_core *vx, int index, const struct firmware *fw)
{
      int err;

      switch (index) {
      case 0:
            /* xilinx boot */
            if ((err = vx_check_magic(vx)) < 0)
                  return err;
            if ((err = snd_vx_load_boot_image(vx, fw)) < 0)
                  return err;
            return 0;
      case 1:
            /* xilinx image */
            return vxp_load_xilinx_binary(vx, fw);
      case 2:
            /* DSP boot */
            return snd_vx_dsp_boot(vx, fw);
      case 3:
            /* DSP image */
            return snd_vx_dsp_load(vx, fw);
      default:
            snd_BUG();
            return -EINVAL;
      }
}
            

/*
 * vx_test_and_ack - test and acknowledge interrupt
 *
 * called from irq hander, too
 *
 * spinlock held!
 */
static int vxp_test_and_ack(struct vx_core *_chip)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;

      /* not booted yet? */
      if (! (_chip->chip_status & VX_STAT_XILINX_LOADED))
            return -ENXIO;

      if (! (vx_inb(chip, DIALOG) & VXP_DLG_MEMIRQ_MASK))
            return -EIO;
      
      /* ok, interrupts generated, now ack it */
      /* set ACQUIT bit up and down */
      vx_outb(chip, DIALOG, chip->regDIALOG | VXP_DLG_ACK_MEMIRQ_MASK);
      /* useless read just to spend some time and maintain
       * the ACQUIT signal up for a while ( a bus cycle )
       */
      vx_inb(chip, DIALOG);
      vx_outb(chip, DIALOG, chip->regDIALOG & ~VXP_DLG_ACK_MEMIRQ_MASK);

      return 0;
}


/*
 * vx_validate_irq - enable/disable IRQ
 */
static void vxp_validate_irq(struct vx_core *_chip, int enable)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;

      /* Set the interrupt enable bit to 1 in CDSP register */
      if (enable)
            chip->regCDSP |= VXP_CDSP_VALID_IRQ_MASK;
      else
            chip->regCDSP &= ~VXP_CDSP_VALID_IRQ_MASK;
      vx_outb(chip, CDSP, chip->regCDSP);
}

/*
 * vx_setup_pseudo_dma - set up the pseudo dma read/write mode.
 * @do_write: 0 = read, 1 = set up for DMA write
 */
static void vx_setup_pseudo_dma(struct vx_core *_chip, int do_write)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;

      /* Interrupt mode and HREQ pin enabled for host transmit / receive data transfers */
      vx_outb(chip, ICR, do_write ? ICR_TREQ : ICR_RREQ);
      /* Reset the pseudo-dma register */
      vx_inb(chip, ISR);
      vx_outb(chip, ISR, 0);

      /* Select DMA in read/write transfer mode and in 16-bit accesses */
      chip->regDIALOG |= VXP_DLG_DMA16_SEL_MASK;
      chip->regDIALOG |= do_write ? VXP_DLG_DMAWRITE_SEL_MASK : VXP_DLG_DMAREAD_SEL_MASK;
      vx_outb(chip, DIALOG, chip->regDIALOG);

}

/*
 * vx_release_pseudo_dma - disable the pseudo-DMA mode
 */
static void vx_release_pseudo_dma(struct vx_core *_chip)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;

      /* Disable DMA and 16-bit accesses */
      chip->regDIALOG &= ~(VXP_DLG_DMAWRITE_SEL_MASK|
                       VXP_DLG_DMAREAD_SEL_MASK|
                       VXP_DLG_DMA16_SEL_MASK);
      vx_outb(chip, DIALOG, chip->regDIALOG);
      /* HREQ pin disabled. */
      vx_outb(chip, ICR, 0);
}

/*
 * vx_pseudo_dma_write - write bulk data on pseudo-DMA mode
 * @count: data length to transfer in bytes
 *
 * data size must be aligned to 6 bytes to ensure the 24bit alignment on DSP.
 * NB: call with a certain lock!
 */
static void vxp_dma_write(struct vx_core *chip, struct snd_pcm_runtime *runtime,
                    struct vx_pipe *pipe, int count)
{
      long port = vxp_reg_addr(chip, VX_DMA);
      int offset = pipe->hw_ptr;
      unsigned short *addr = (unsigned short *)(runtime->dma_area + offset);

      vx_setup_pseudo_dma(chip, 1);
      if (offset + count > pipe->buffer_bytes) {
            int length = pipe->buffer_bytes - offset;
            count -= length;
            length >>= 1; /* in 16bit words */
            /* Transfer using pseudo-dma. */
            while (length-- > 0) {
                  outw(cpu_to_le16(*addr), port);
                  addr++;
            }
            addr = (unsigned short *)runtime->dma_area;
            pipe->hw_ptr = 0;
      }
      pipe->hw_ptr += count;
      count >>= 1; /* in 16bit words */
      /* Transfer using pseudo-dma. */
      while (count-- > 0) {
            outw(cpu_to_le16(*addr), port);
            addr++;
      }
      vx_release_pseudo_dma(chip);
}


/*
 * vx_pseudo_dma_read - read bulk data on pseudo DMA mode
 * @offset: buffer offset in bytes
 * @count: data length to transfer in bytes
 *
 * the read length must be aligned to 6 bytes, as well as write.
 * NB: call with a certain lock!
 */
static void vxp_dma_read(struct vx_core *chip, struct snd_pcm_runtime *runtime,
                   struct vx_pipe *pipe, int count)
{
      struct snd_vxpocket *pchip = (struct snd_vxpocket *)chip;
      long port = vxp_reg_addr(chip, VX_DMA);
      int offset = pipe->hw_ptr;
      unsigned short *addr = (unsigned short *)(runtime->dma_area + offset);

      snd_assert(count % 2 == 0, return);
      vx_setup_pseudo_dma(chip, 0);
      if (offset + count > pipe->buffer_bytes) {
            int length = pipe->buffer_bytes - offset;
            count -= length;
            length >>= 1; /* in 16bit words */
            /* Transfer using pseudo-dma. */
            while (length-- > 0)
                  *addr++ = le16_to_cpu(inw(port));
            addr = (unsigned short *)runtime->dma_area;
            pipe->hw_ptr = 0;
      }
      pipe->hw_ptr += count;
      count >>= 1; /* in 16bit words */
      /* Transfer using pseudo-dma. */
      while (count-- > 1)
            *addr++ = le16_to_cpu(inw(port));
      /* Disable DMA */
      pchip->regDIALOG &= ~VXP_DLG_DMAREAD_SEL_MASK;
      vx_outb(chip, DIALOG, pchip->regDIALOG);
      /* Read the last word (16 bits) */
      *addr = le16_to_cpu(inw(port));
      /* Disable 16-bit accesses */
      pchip->regDIALOG &= ~VXP_DLG_DMA16_SEL_MASK;
      vx_outb(chip, DIALOG, pchip->regDIALOG);
      /* HREQ pin disabled. */
      vx_outb(chip, ICR, 0);
}


/*
 * write a codec data (24bit)
 */
static void vxp_write_codec_reg(struct vx_core *chip, int codec, unsigned int data)
{
      int i;

      /* Activate access to the corresponding codec register */
      if (! codec)
            vx_inb(chip, LOFREQ);
      else
            vx_inb(chip, CODEC2);
            
      /* We have to send 24 bits (3 x 8 bits). Start with most signif. Bit */
      for (i = 0; i < 24; i++, data <<= 1)
            vx_outb(chip, DATA, ((data & 0x800000) ? VX_DATA_CODEC_MASK : 0));
      
      /* Terminate access to codec registers */
      vx_inb(chip, HIFREQ);
}


/*
 * vx_set_mic_boost - set mic boost level (on vxp440 only)
 * @boost: 0 = 20dB, 1 = +38dB
 */
void vx_set_mic_boost(struct vx_core *chip, int boost)
{
      struct snd_vxpocket *pchip = (struct snd_vxpocket *)chip;
      unsigned long flags;

      if (chip->chip_status & VX_STAT_IS_STALE)
            return;

      spin_lock_irqsave(&chip->lock, flags);
      if (pchip->regCDSP & P24_CDSP_MICS_SEL_MASK) {
            if (boost) {
                  /* boost: 38 dB */
                  pchip->regCDSP &= ~P24_CDSP_MIC20_SEL_MASK;
                  pchip->regCDSP |=  P24_CDSP_MIC38_SEL_MASK;
            } else {
                  /* minimum value: 20 dB */
                  pchip->regCDSP |=  P24_CDSP_MIC20_SEL_MASK;
                  pchip->regCDSP &= ~P24_CDSP_MIC38_SEL_MASK;
                }
            vx_outb(chip, CDSP, pchip->regCDSP);
      }
      spin_unlock_irqrestore(&chip->lock, flags);
}

/*
 * remap the linear value (0-8) to the actual value (0-15)
 */
static int vx_compute_mic_level(int level)
{
      switch (level) {
      case 5: level = 6 ; break;
      case 6: level = 8 ; break;
      case 7: level = 11; break;
      case 8: level = 15; break;
      default: break ;
      }
      return level;
}

/*
 * vx_set_mic_level - set mic level (on vxpocket only)
 * @level: the mic level = 0 - 8 (max)
 */
void vx_set_mic_level(struct vx_core *chip, int level)
{
      struct snd_vxpocket *pchip = (struct snd_vxpocket *)chip;
      unsigned long flags;

      if (chip->chip_status & VX_STAT_IS_STALE)
            return;

      spin_lock_irqsave(&chip->lock, flags);
      if (pchip->regCDSP & VXP_CDSP_MIC_SEL_MASK) {
            level = vx_compute_mic_level(level);
            vx_outb(chip, MICRO, level);
      }
      spin_unlock_irqrestore(&chip->lock, flags);
}


/*
 * change the input audio source
 */
static void vxp_change_audio_source(struct vx_core *_chip, int src)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;

      switch (src) {
      case VX_AUDIO_SRC_DIGITAL:
            chip->regCDSP |= VXP_CDSP_DATAIN_SEL_MASK;
            vx_outb(chip, CDSP, chip->regCDSP);
            break;
      case VX_AUDIO_SRC_LINE:
            chip->regCDSP &= ~VXP_CDSP_DATAIN_SEL_MASK;
            if (_chip->type == VX_TYPE_VXP440)
                  chip->regCDSP &= ~P24_CDSP_MICS_SEL_MASK;
            else
                  chip->regCDSP &= ~VXP_CDSP_MIC_SEL_MASK;
            vx_outb(chip, CDSP, chip->regCDSP);
            break;
      case VX_AUDIO_SRC_MIC:
            chip->regCDSP &= ~VXP_CDSP_DATAIN_SEL_MASK;
            /* reset mic levels */
            if (_chip->type == VX_TYPE_VXP440) {
                  chip->regCDSP &= ~P24_CDSP_MICS_SEL_MASK;
                  if (chip->mic_level)
                        chip->regCDSP |=  P24_CDSP_MIC38_SEL_MASK;
                  else
                        chip->regCDSP |= P24_CDSP_MIC20_SEL_MASK;
                  vx_outb(chip, CDSP, chip->regCDSP);
            } else {
                  chip->regCDSP |= VXP_CDSP_MIC_SEL_MASK;
                  vx_outb(chip, CDSP, chip->regCDSP);
                  vx_outb(chip, MICRO, vx_compute_mic_level(chip->mic_level));
            }
            break;
      }
}

/*
 * change the clock source
 * source = INTERNAL_QUARTZ or UER_SYNC
 */
static void vxp_set_clock_source(struct vx_core *_chip, int source)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;

      if (source == INTERNAL_QUARTZ)
            chip->regCDSP &= ~VXP_CDSP_CLOCKIN_SEL_MASK;
      else
            chip->regCDSP |= VXP_CDSP_CLOCKIN_SEL_MASK;
      vx_outb(chip, CDSP, chip->regCDSP);
}


/*
 * reset the board
 */
static void vxp_reset_board(struct vx_core *_chip, int cold_reset)
{
      struct snd_vxpocket *chip = (struct snd_vxpocket *)_chip;

      chip->regCDSP = 0;
      chip->regDIALOG = 0;
}


/*
 * callbacks
 */
/* exported */
struct snd_vx_ops snd_vxpocket_ops = {
      .in8 = vxp_inb,
      .out8 = vxp_outb,
      .test_and_ack = vxp_test_and_ack,
      .validate_irq = vxp_validate_irq,
      .write_codec = vxp_write_codec_reg,
      .reset_codec = vxp_reset_codec,
      .change_audio_source = vxp_change_audio_source,
      .set_clock_source = vxp_set_clock_source,
      .load_dsp = vxp_load_dsp,
      .add_controls = vxp_add_mic_controls,
      .reset_dsp = vxp_reset_dsp,
      .reset_board = vxp_reset_board,
      .dma_write = vxp_dma_write,
      .dma_read = vxp_dma_read,
};

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