path: root/drivers/char/ip2/i2ellis.c

/*******************************************************************************
*
*   (c) 1998 by Computone Corporation
*
********************************************************************************
*
*
*   PACKAGE:     Linux tty Device Driver for IntelliPort family of multiport
*                serial I/O controllers.
*
*   DESCRIPTION: Low-level interface code for the device driver
*                (This is included source code, not a separate compilation
*                module.)
*
*******************************************************************************/
//---------------------------------------------
// Function declarations private to this module
//---------------------------------------------
// Functions called only indirectly through i2eBordStr entries.

static int iiWriteBuf16(i2eBordStrPtr, unsigned char *, int);
static int iiWriteBuf8(i2eBordStrPtr, unsigned char *, int);
static int iiReadBuf16(i2eBordStrPtr, unsigned char *, int);
static int iiReadBuf8(i2eBordStrPtr, unsigned char *, int);

static unsigned short iiReadWord16(i2eBordStrPtr);
static unsigned short iiReadWord8(i2eBordStrPtr);
static void iiWriteWord16(i2eBordStrPtr, unsigned short);
static void iiWriteWord8(i2eBordStrPtr, unsigned short);

static int iiWaitForTxEmptyII(i2eBordStrPtr, int);
static int iiWaitForTxEmptyIIEX(i2eBordStrPtr, int);
static int iiTxMailEmptyII(i2eBordStrPtr);
static int iiTxMailEmptyIIEX(i2eBordStrPtr);
static int iiTrySendMailII(i2eBordStrPtr, unsigned char);
static int iiTrySendMailIIEX(i2eBordStrPtr, unsigned char);

static unsigned short iiGetMailII(i2eBordStrPtr);
static unsigned short iiGetMailIIEX(i2eBordStrPtr);

static void iiEnableMailIrqII(i2eBordStrPtr);
static void iiEnableMailIrqIIEX(i2eBordStrPtr);
static void iiWriteMaskII(i2eBordStrPtr, unsigned char);
static void iiWriteMaskIIEX(i2eBordStrPtr, unsigned char);

static void ii2DelayTimer(unsigned int);
static void ii2DelayWakeup(unsigned long id);
static void ii2Nop(void);

//***************
//* Static Data *
//***************

static int ii2Safe;         // Safe I/O address for delay routine

static int iiDelayed;	// Set when the iiResetDelay function is
							// called. Cleared when ANY board is reset.
static struct timer_list * pDelayTimer;   // Used by iiDelayTimer
static wait_queue_head_t pDelayWait;    // Used by iiDelayTimer
static rwlock_t Dl_spinlock;

//********
//* Code *
//********

//=======================================================
// Initialization Routines
//
// iiSetAddress
// iiReset
// iiResetDelay
// iiInitialize
//=======================================================

//******************************************************************************
// Function:   iiEllisInit()
// Parameters: None
//
// Returns:    Nothing
//
// Description:
//
// This routine performs any required initialization of the iiEllis subsystem.
//
//******************************************************************************
static void
iiEllisInit(void)
{
	pDelayTimer = kmalloc ( sizeof (struct timer_list), GFP_KERNEL );
	init_timer(pDelayTimer);
	init_waitqueue_head(&pDelayWait);
	LOCK_INIT(&Dl_spinlock);
}

//******************************************************************************
// Function:   iiEllisCleanup()
// Parameters: None
//
// Returns:    Nothing
//
// Description:
//
// This routine performs any required cleanup of the iiEllis subsystem.
//
//***********************************************************