i2ellis.c

linux-2.6.15.6

// sent (identity unknown...). Uses 16-bit (word) operations. Is called
// indirectly through pB->i2eWriteBuf.
//
//******************************************************************************
static int
iiWriteBuf16(i2eBordStrPtr pB, unsigned char *address, int count)
{
	// Rudimentary sanity checking here.
	if (pB->i2eValid != I2E_MAGIC)
		COMPLETE(pB, I2EE_INVALID);

	OUTSW ( pB->i2eData, address, count);

	COMPLETE(pB, I2EE_GOOD);
}

//******************************************************************************
// Function:   iiWriteBuf8(pB, address, count)
// Parameters: pB      - pointer to board structure
//             address - address of data to write
//             count   - number of data bytes to write
//
// Returns:    True if everything appears copacetic.
//             False if there is any error: the pB->i2eError field has the error
//
// Description:
//
// Writes 'count' bytes from 'address' to the data fifo specified by the board
// structure pointer pB. Should count happen to be odd, an extra pad byte is
// sent (identity unknown...). This is to be consistent with the 16-bit version.
// Uses 8-bit (byte) operations. Is called indirectly through pB->i2eWriteBuf.
//
//******************************************************************************
static int
iiWriteBuf8(i2eBordStrPtr pB, unsigned char *address, int count)
{
	/* Rudimentary sanity checking here */
	if (pB->i2eValid != I2E_MAGIC)
		COMPLETE(pB, I2EE_INVALID);

	OUTSB ( pB->i2eData, address, count );

	COMPLETE(pB, I2EE_GOOD);
}

//******************************************************************************
// Function:   iiReadBuf16(pB, address, count)
// Parameters: pB      - pointer to board structure
//             address - address to put data read
//             count   - number of data bytes to read
//
// Returns:    True if everything appears copacetic.
//             False if there is any error: the pB->i2eError field has the error
//
// Description:
//
// Reads 'count' bytes into 'address' from the data fifo specified by the board
// structure pointer pB. Should count happen to be odd, an extra pad byte is
// received (identity unknown...). Uses 16-bit (word) operations. Is called
// indirectly through pB->i2eReadBuf.
//
//******************************************************************************
static int
iiReadBuf16(i2eBordStrPtr pB, unsigned char *address, int count)
{
	// Rudimentary sanity checking here.
	if (pB->i2eValid != I2E_MAGIC)
		COMPLETE(pB, I2EE_INVALID);

	INSW ( pB->i2eData, address, count);

	COMPLETE(pB, I2EE_GOOD);
}

//******************************************************************************
// Function:   iiReadBuf8(pB, address, count)
// Parameters: pB      - pointer to board structure
//             address - address to put data read
//             count   - number of data bytes to read
//
// Returns:    True if everything appears copacetic.
//             False if there is any error: the pB->i2eError field has the error
//
// Description:
//
// Reads 'count' bytes into 'address' from the data fifo specified by the board
// structure pointer pB. Should count happen to be odd, an extra pad byte is
// received (identity unknown...). This to match the 16-bit behaviour. Uses
// 8-bit (byte) operations. Is called indirectly through pB->i2eReadBuf.
//
//******************************************************************************
static int
iiReadBuf8(i2eBordStrPtr pB, unsigned char *address, int count)
{
	// Rudimentary sanity checking here.
	if (pB->i2eValid != I2E_MAGIC)
		COMPLETE(pB, I2EE_INVALID);

	INSB ( pB->i2eData, address, count);

	COMPLETE(pB, I2EE_GOOD);
}

//******************************************************************************
// Function:   iiReadWord16(pB)
// Parameters: pB      - pointer to board structure
//
// Returns:    True if everything appears copacetic.
//             False if there is any error: the pB->i2eError field has the error
//
// Description:
//
// Returns the word read from the data fifo specified by the board-structure
// pointer pB. Uses a 16-bit operation. Is called indirectly through
// pB->i2eReadWord.
//
//******************************************************************************
static unsigned short
iiReadWord16(i2eBordStrPtr pB)
{
	return (unsigned short)( INW(pB->i2eData) );
}

//******************************************************************************
// Function:   iiReadWord8(pB)
// Parameters: pB      - pointer to board structure
//
// Returns:    True if everything appears copacetic.
//             False if there is any error: the pB->i2eError field has the error
//
// Description:
//
// Returns the word read from the data fifo specified by the board-structure
// pointer pB. Uses two 8-bit operations. Bytes are assumed to be LSB first. Is
// called indirectly through pB->i2eReadWord.
//
//******************************************************************************
static unsigned short
iiReadWord8(i2eBordStrPtr pB)
{
	unsigned short urs;

	urs = INB ( pB->i2eData );

	return ( ( INB ( pB->i2eData ) << 8 ) | urs );
}

//******************************************************************************
// Function:   iiWriteWord16(pB, value)
// Parameters: pB    - pointer to board structure
//             value - data to write
//
// Returns:    True if everything appears copacetic.
//             False if there is any error: the pB->i2eError field has the error
//
// Description:
//
// Writes the word 'value' to the data fifo specified by the board-structure
// pointer pB. Uses 16-bit operation. Is called indirectly through
// pB->i2eWriteWord.
//
//******************************************************************************
static void
iiWriteWord16(i2eBordStrPtr pB, unsigned short value)
{
	WORD_TO(pB, (int)value);
}

//******************************************************************************
// Function:   iiWriteWord8(pB, value)
// Parameters: pB    - pointer to board structure
//             value - data to write
//
// Returns:    True if everything appears copacetic.
//             False if there is any error: the pB->i2eError field has the error
//
// Description:
//
// Writes the word 'value' to the data fifo specified by the board-structure
// pointer pB. Uses two 8-bit operations (writes LSB first). Is called
// indirectly through pB->i2eWriteWord.
//
//******************************************************************************
static void
iiWriteWord8(i2eBordStrPtr pB, unsigned short value)
{
	BYTE_TO(pB, (char)value);
	BYTE_TO(pB, (char)(value >> 8) );
}

//******************************************************************************
// Function:   iiWaitForTxEmptyII(pB, mSdelay)
// Parameters: pB      - pointer to board structure
//             mSdelay - period to wait before returning
//
// Returns:    True if the FIFO is empty.
//             False if it not empty in the required time: the pB->i2eError
//             field has the error.
//
// Description:
//
// Waits up to "mSdelay" milliseconds for the outgoing FIFO to become empty; if
// not empty by the required time, returns false and error in pB->i2eError,
// otherwise returns true.
//
// mSdelay == 0 is taken to mean must be empty on the first test.
//
// This version operates on IntelliPort-II - style FIFO's
//
// Note this routine is organized so that if status is ok there is no delay at
// all called either before or after the test.  Is called indirectly through
// pB->i2eWaitForTxEmpty.
//
//******************************************************************************
static int
iiWaitForTxEmptyII(i2eBordStrPtr pB, int mSdelay)
{
	unsigned long	flags;
	int itemp;

	for (;;)
	{
		// This routine hinges on being able to see the "other" status register
		// (as seen by the local processor).  His incoming fifo is our outgoing
		// FIFO.
		//
		// By the nature of this routine, you would be using this as part of a
		// larger atomic context: i.e., you would use this routine to ensure the
		// fifo empty, then act on this information. Between these two halves, 
		// you will generally not want to service interrupts or in any way 
		// disrupt the assumptions implicit in the larger context.
		//
		// Even worse, however, this routine "shifts" the status register to 
		// point to the local status register which is not the usual situation.
		// Therefore for extra safety, we force the critical section to be
		// completely atomic, and pick up after ourselves before allowing any
		// interrupts of any kind.


		WRITE_LOCK_IRQSAVE(&Dl_spinlock,flags)
		OUTB(pB->i2ePointer, SEL_COMMAND);
		OUTB(pB->i2ePointer, SEL_CMD_SH);

		itemp = INB(pB->i2eStatus);

		OUTB(pB->i2ePointer, SEL_COMMAND);
		OUTB(pB->i2ePointer, SEL_CMD_UNSH);

		if (itemp & ST_IN_EMPTY)
		{
			UPDATE_FIFO_ROOM(pB);
			WRITE_UNLOCK_IRQRESTORE(&Dl_spinlock,flags)
			COMPLETE(pB, I2EE_GOOD);
		}

		WRITE_UNLOCK_IRQRESTORE(&Dl_spinlock,flags)

		if (mSdelay-- == 0)
			break;

		iiDelay(pB, 1);      /* 1 mS granularity on checking condition */
	}
	COMPLETE(pB, I2EE_TXE_TIME);
}

//******************************************************************************
// Function:   iiWaitForTxEmptyIIEX(pB, mSdelay)
// Parameters: pB      - pointer to board structure
//             mSdelay - period to wait before returning
//
// Returns:    True if the FIFO is empty.
//             False if it not empty in the required time: the pB->i2eError
//             field has the error.
//
// Description:
//
// Waits up to "mSdelay" milliseconds for the outgoing FIFO to become empty; if
// not empty by the required time, returns false and error in pB->i2eError,
// otherwise returns true.
//
// mSdelay == 0 is taken to mean must be empty on the first test.
//
// This version operates on IntelliPort-IIEX - style FIFO's
//
// Note this routine is organized so that if status is ok there is no delay at
// all called either before or after the test.  Is called indirectly through
// pB->i2eWaitForTxEmpty.
//
//******************************************************************************
static int
iiWaitForTxEmptyIIEX(i2eBordStrPtr pB, int mSdelay)
{
	unsigned long	flags;

	for (;;)
	{
		// By the nature of this routine, you would be using this as part of a
		// larger atomic context: i.e., you would use this routine to ensure the
		// fifo empty, then act on this information. Between these two halves,
		// you will generally not want to service interrupts or in any way
		// disrupt the assumptions implicit in the larger context.

		WRITE_LOCK_IRQSAVE(&Dl_spinlock,flags)

		if (INB(pB->i2eStatus) & STE_OUT_MT) {
			UPDATE_FIFO_ROOM(pB);
			WRITE_UNLOCK_IRQRESTORE(&Dl_spinlock,flags)
			COMPLETE(pB, I2EE_GOOD);
		}
		WRITE_UNLOCK_IRQRESTORE(&Dl_spinlock,flags)

		if (mSdelay-- == 0)
			break;

		iiDelay(pB, 1);      // 1 mS granularity on checking condition
	}
	COMPLETE(pB, I2EE_TXE_TIME);
}

//******************************************************************************
// Function:   iiTxMailEmptyII(pB)
// Parameters: pB      - pointer to board structure
//
// Returns:    True if the transmit mailbox is empty.
//             False if it not empty.
//
// Description:
//
// Returns true or false according to whether the transmit mailbox is empty (and
// therefore able to accept more mail)
//
// This version operates on IntelliPort-II - style FIFO's
//
//******************************************************************************
static int
iiTxMailEmptyII(i2eBordStrPtr pB)
{
	int port = pB->i2ePointer;
	OUTB ( port, SEL_OUTMAIL );
	return ( INB(port) == 0 );
}

//******************************************************************************
// Function:   iiTxMailEmptyIIEX(pB)
// Parameters: pB      - pointer to board structure
//
// Returns:    True if the transmit mailbox is empty.
//             False if it not empty.
//
// Description:
//
// Returns true or false according to whether the transmit mailbox is empty (and
// therefore able to accept more mail)
//
// This version operates on IntelliPort-IIEX - style FIFO's
//
//******************************************************************************
static int
iiTxMailEmptyIIEX(i2eBordStrPtr pB)
{
	return !(INB(pB->i2eStatus) & STE_OUT_MAIL);
}

//******************************************************************************
// Function:   iiTrySendMailII(pB,mail)
// Parameters: pB   - pointer to board structure
//             mail - value to write to mailbox
//
// Returns:    True if the transmit mailbox is empty, and mail is sent.
//             False if it not empty.
//
// Description: