mindrvr.c

来自「ata和atapi的驱动程序」· C语言 代码 · 共 2,161 行 · 第 1/5 页

   // these commands transfer only 1 sector
   if (    ( cmd == CMD_IDENTIFY_DEVICE )
        || ( cmd == CMD_IDENTIFY_DEVICE_PACKET )
      )
      numSect = 1;

   // adjust multiple count
   if ( multiCnt & 0x0800 )
   {
      // assume caller knows what they are doing
      multiCnt &= 0x00ff;
   }
   else
   {
      // only Read Multiple uses multiCnt
      if ( cmd != CMD_READ_MULTIPLE )
         multiCnt = 1;
   }

   reg_cmd_info.ns  = numSect;
   reg_cmd_info.mc  = multiCnt;

   return exec_pio_data_in_cmd( dev, bufAddr, numSect, multiCnt );
}

//*************************************************************
//
// reg_pio_data_in_lba48() - Easy way to execute a PIO Data In command
//                           using an LBA sector address.
//
//*************************************************************

int reg_pio_data_in_lba48( unsigned char dev, unsigned char cmd,
                           unsigned int fr, unsigned int sc,
                           unsigned long lbahi, unsigned long lbalo,
                           unsigned char * bufAddr,
                           long numSect, int multiCnt )

{

   reg_cmd_info.cmd = cmd;
   reg_cmd_info.fr = fr;
   reg_cmd_info.sc = sc;
   reg_cmd_info.dh = (unsigned char) ( CB_DH_LBA | ( dev ? CB_DH_DEV1 : CB_DH_DEV0 ) );
   reg_cmd_info.dc = (unsigned char) ( int_use_intr_flag ? 0 : CB_DC_NIEN );
   reg_cmd_info.lbaSize = LBA48;
   reg_cmd_info.lbaHigh = lbahi;
   reg_cmd_info.lbaLow = lbalo;

   // adjust multiple count
   if ( multiCnt & 0x0800 )
   {
      // assume caller knows what they are doing
      multiCnt &= 0x00ff;
   }
   else
   {
      // only Read Multiple Ext uses multiCnt
      if ( cmd != CMD_READ_MULTIPLE_EXT )
         multiCnt = 1;
   }

   reg_cmd_info.ns  = numSect;
   reg_cmd_info.mc  = multiCnt;

   return exec_pio_data_in_cmd( dev, bufAddr, numSect, multiCnt );
}

//*************************************************************
//
// exec_pio_data_out_cmd() - Execute a PIO Data Out command.
//
// See ATA-2 Section 9.4, ATA-3 Section 9.4,
// ATA-4 Section 8.7 Figure 11.
//
//*************************************************************

static int exec_pio_data_out_cmd( unsigned char dev,
                             unsigned char * bufAddr,
                             long numSect, int multiCnt );

static int exec_pio_data_out_cmd( unsigned char dev,
                             unsigned char * bufAddr,
                             long numSect, int multiCnt )

{
   unsigned char status;
   int loopFlag = 1;
   long wordCnt;

   // reset Bus Master Error bit

   pio_writeBusMstrStatus( BM_SR_MASK_ERR );

   // Set command time out.

   tmr_set_timeout();

   // Select the drive - call the sub_select function.
   // Quit now if this fails.

   if ( sub_select( dev ) )
   {
      return 1;
   }

   // Set up all the registers except the command register.

   sub_setup_command();

   // Start the command by setting the Command register.  The drive
   // should immediately set BUSY status.

   pio_outbyte( CB_CMD, reg_cmd_info.cmd );

   // Waste some time by reading the alternate status a few times.
   // This gives the drive time to set BUSY in the status register on
   // really fast systems.  If we don't do this, a slow drive on a fast
   // system may not set BUSY fast enough and we would think it had
   // completed the command when it really had not even started the
   // command yet.

   DELAY400NS;

   // Wait for not BUSY or time out.
   // Note: No interrupt is generated for the
   // first sector of a write command.

   while ( 1 )
   {
      status = pio_inbyte( CB_ASTAT );
      if ( ( status & CB_STAT_BSY ) == 0 )
         break;
      if ( tmr_chk_timeout() )
      {
         reg_cmd_info.to = 1;
         reg_cmd_info.ec = 47;
         loopFlag = 0;
         break;
      }
   }

   // This loop writes each sector.

   while ( loopFlag )
   {
      // WRITE_LOOP:
      //
      // NOTE NOTE NOTE ...  The primary status register (1f7) MUST NOT be
      // read more than ONCE for each sector transferred!  When the
      // primary status register is read, the drive resets IRQ.  The
      // alternate status register (3f6) can be read any number of times.
      // For correct results, transfer the 256 words (REP OUTSW), wait for
      // interrupt and then read the primary status register.  AS
      // SOON as BOTH the primary status register has been read AND the
      // last of the 256 words has been written, the drive is allowed to
      // generate the next IRQ (newer and faster drives could generate
      // the next IRQ in 50 microseconds or less).  If the primary
      // status register is read more than once, there is the possibility
      // of a race between the drive and the software and the next IRQ
      // could be reset before the system interrupt controller sees it.

      // If BSY=0 and DRQ=1, transfer the data,
      // even if we find out there is an error later.

      if ( ( status & ( CB_STAT_BSY | CB_STAT_DRQ ) ) == CB_STAT_DRQ )
      {

         // increment number of DRQ packets

         reg_cmd_info.drqPackets ++ ;

         // determine the number of sectors to transfer

         wordCnt = multiCnt ? multiCnt : 1;
         if ( wordCnt > numSect )
            wordCnt = numSect;
         wordCnt = wordCnt * 256;

         // Do the REP OUTSW to write the data for one DRQ block.

         reg_cmd_info.totalBytesXfer += ( wordCnt << 1 );
         pio_drq_block_out( CB_DATA, bufAddr, wordCnt );

         DELAY400NS;    // delay so device can get the status updated

         // Note: The drive should have dropped DATA REQUEST and
         // raised BUSY by now.

         // Decrement the count of sectors to be transferred
         // and increment buffer address.

         numSect = numSect - ( multiCnt ? multiCnt : 1 );
         bufAddr = bufAddr + ( 512 * ( multiCnt ? multiCnt : 1 ) );
      }

      // So was there any error condition?

      if ( status & ( CB_STAT_BSY | CB_STAT_DF | CB_STAT_ERR ) )
      {
         reg_cmd_info.ec = 41;
         break;   // go to WRITE_DONE
      }

      // DRQ should have been set -- was it?

      if ( ( status & CB_STAT_DRQ ) == 0 )
      {
         reg_cmd_info.ec = 42;
         break;   // go to WRITE_DONE
      }

      // Wait for interrupt -or- wait for not BUSY -or- wait for time out.

      sub_wait_poll( 44, 45 );

      // If polling or error read the status, otherwise
      // get the status that was read by the interrupt handler.

      if ( ( ! int_use_intr_flag ) || ( reg_cmd_info.ec ) )
         status = pio_inbyte( CB_STAT );
      else
         status = int_ata_status;

      // If there was a time out error, go to WRITE_DONE.

      if ( reg_cmd_info.ec )
         break;   // go to WRITE_DONE

      // If all of the requested sectors have been transferred, make a
      // few more checks before we exit.

      if ( numSect < 1 )
      {
         // Since the drive has transferred all of the sectors without
         // error, the drive MUST not have BUSY, DEVICE FAULT, DATA REQUEST
         // or ERROR status at this time.

         if ( status & ( CB_STAT_BSY | CB_STAT_DF | CB_STAT_DRQ | CB_STAT_ERR ) )
         {
            reg_cmd_info.ec = 43;
            break;   // go to WRITE_DONE
         }

         // All sectors have been written without error, go to WRITE_DONE.

         break;   // go to WRITE_DONE

      }

      //
      // This is the end of the write loop.  If we get here, the loop
      // is repeated to write the next sector.  Go back to WRITE_LOOP.

   }

   // BMIDE Error=1?

   if ( pio_readBusMstrStatus() & BM_SR_MASK_ERR )
   {
      reg_cmd_info.ec = 78;                  // yes
   }

   // WRITE_DONE:

   // All done.  The return values of this function are described in
   // MINDRVR.H.

   if ( reg_cmd_info.ec )
      return 1;
   return 0;
}

//*************************************************************
//
// reg_pio_data_out_lba28() - Easy way to execute a PIO Data In command
//                            using an LBA sector address.
//
//*************************************************************

int reg_pio_data_out_lba28( unsigned char dev, unsigned char cmd,
                            unsigned int fr, unsigned int sc,
                            unsigned long lba,
                            unsigned char * bufAddr,
                            long numSect, int multiCnt )

{

   reg_cmd_info.cmd = cmd;
   reg_cmd_info.fr = fr;
   reg_cmd_info.sc = sc;
   reg_cmd_info.dh = (unsigned char) ( CB_DH_LBA | ( dev ? CB_DH_DEV1 : CB_DH_DEV0 ) );
   reg_cmd_info.dc = (unsigned char) ( int_use_intr_flag ? 0 : CB_DC_NIEN );
   reg_cmd_info.lbaSize = LBA28;
   reg_cmd_info.lbaHigh = 0;
   reg_cmd_info.lbaLow = lba;

   // adjust multiple count
   if ( multiCnt & 0x0800 )
   {
      // assume caller knows what they are doing
      multiCnt &= 0x00ff;
   }
   else
   {
      // only Write Multiple and CFA Write Multiple W/O Erase uses multiCnt
      if (    ( cmd != CMD_WRITE_MULTIPLE )
           && ( cmd != CMD_CFA_WRITE_MULTIPLE_WO_ERASE )
         )
         multiCnt = 1;
   }

   reg_cmd_info.ns  = numSect;
   reg_cmd_info.mc  = multiCnt;

   return exec_pio_data_out_cmd( dev, bufAddr, numSect, multiCnt );
}

//*************************************************************
//
// reg_pio_data_out_lba48() - Easy way to execute a PIO Data In command
//                            using an LBA sector address.
//
//*************************************************************

int reg_pio_data_out_lba48( unsigned char dev, unsigned char cmd,
                            unsigned int fr, unsigned int sc,
                            unsigned long lbahi, unsigned long lbalo,
                            unsigned char * bufAddr,
                            long numSect, int multiCnt )

{

   reg_cmd_info.cmd = cmd;
   reg_cmd_info.fr = fr;
   reg_cmd_info.sc = sc;
   reg_cmd_info.dh = (unsigned char) ( CB_DH_LBA | ( dev ? CB_DH_DEV1 : CB_DH_DEV0 ) );
   reg_cmd_info.dc = (unsigned char) ( int_use_intr_flag ? 0 : CB_DC_NIEN );
   reg_cmd_info.lbaSize = LBA48;
   reg_cmd_info.lbaHigh = lbahi;
   reg_cmd_info.lbaLow = lbalo;

   // adjust multiple count
   if ( multiCnt & 0x0800 )
   {
      // assume caller knows what they are doing
      multiCnt &= 0x00ff;
   }
   else
   {
      // only Write Multiple Ext uses multiCnt
      if ( cmd != CMD_WRITE_MULTIPLE_EXT )
         multiCnt = 1;
   }

   reg_cmd_info.ns  = numSect;
   reg_cmd_info.mc  = multiCnt;

   return exec_pio_data_out_cmd( dev, bufAddr, numSect, multiCnt );
}

#if INCLUDE_ATAPI_PIO

//*************************************************************
//
// reg_packet() - Execute an ATAPI Packet (A0H) command.
//
// See ATA-4 Section 9.10, Figure 14.
//
//*************************************************************

int reg_packet( unsigned char dev,
                unsigned int cpbc,
                unsigned char * cdbBufAddr,
                int dir,
                long dpbc,
                unsigned char * dataBufAddr )

{
   unsigned char status;
   unsigned int byteCnt;
   long wordCnt;

   // reset Bus Master Error bit

   pio_writeBusMstrStatus( BM_SR_MASK_ERR );

   // Make sure the command packet size is either 12 or 16
   // and save the command packet size and data.

   cpbc = cpbc < 12 ? 12 : cpbc;
   cpbc = cpbc > 12 ? 16 : cpbc;

   // Setup current command information.

   reg_cmd_info.cmd = CMD_PACKET;
   reg_cmd_info.fr = 0;
   reg_cmd_info.sc = 0;
   reg_cmd_info.sn = 0;
   reg_cmd_info.cl = (unsigned char) ( dpbc & 0x00ff );
   reg_cmd_info.ch = ( unsigned char) ( ( dpbc & 0xff00 ) >> 8 );
   reg_cmd_info.dh = (unsigned char) ( dev ? CB_DH_DEV1 : CB_DH_DEV0 );
   reg_cmd_info.dc = (unsigned char) ( int_use_intr_flag ? 0 : CB_DC_NIEN );

   // Set command time out.

   tmr_set_timeout();

   // Select the drive - call the sub_select function.
   // Quit now if this fails.

   if ( sub_select( dev ) )
   {
      return 1;
   }

   // Set up all the registers except the command register.

   sub_setup_command();

   // Start the command by setting the Command register.  The drive
   // should immediately set BUSY status.

   pio_outbyte( CB_CMD, CMD_PACKET );

   // Waste some time by reading the alternate status a few times.
   // This gives the drive time to set BUSY in the status register on
   // really fast systems.  If we don't do this, a slow drive on a fast
   // system may not set BUSY fast enough and we would think it had
   // completed the command when it really had not even started the
   // command yet.