synclink.c

linux和2410结合开发 用他可以生成2410所需的zImage文件

}	/* end of mgsl_isr_transmit_status() */

/* mgsl_isr_io_pin()
 * 
 * 	Service an Input/Output pin interrupt. The type of
 * 	interrupt is indicated by bits in the MISR
 * 	
 * Arguments:		info	       pointer to device instance data
 * Return Value:	None
 */
void mgsl_isr_io_pin( struct mgsl_struct *info )
{
 	struct	mgsl_icount *icount;
	u16 status = usc_InReg( info, MISR );

	if ( debug_level >= DEBUG_LEVEL_ISR )	
		printk("%s(%d):mgsl_isr_io_pin status=%04X\n",
			__FILE__,__LINE__,status);
			
	usc_ClearIrqPendingBits( info, IO_PIN );
	usc_UnlatchIostatusBits( info, status );

	if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
	              MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
		icount = &info->icount;
		/* update input line counters */
		if (status & MISCSTATUS_RI_LATCHED) {
			if ((info->ri_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
				usc_DisablestatusIrqs(info,SICR_RI);
			icount->rng++;
			if ( status & MISCSTATUS_RI )
				info->input_signal_events.ri_up++;	
			else
				info->input_signal_events.ri_down++;	
		}
		if (status & MISCSTATUS_DSR_LATCHED) {
			if ((info->dsr_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
				usc_DisablestatusIrqs(info,SICR_DSR);
			icount->dsr++;
			if ( status & MISCSTATUS_DSR )
				info->input_signal_events.dsr_up++;
			else
				info->input_signal_events.dsr_down++;
		}
		if (status & MISCSTATUS_DCD_LATCHED) {
			if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
				usc_DisablestatusIrqs(info,SICR_DCD);
			icount->dcd++;
			if (status & MISCSTATUS_DCD) {
				info->input_signal_events.dcd_up++;
#ifdef CONFIG_SYNCLINK_SYNCPPP	
				if (info->netcount)
					sppp_reopen(info->netdev);
#endif
			} else
				info->input_signal_events.dcd_down++;
		}
		if (status & MISCSTATUS_CTS_LATCHED)
		{
			if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT)
				usc_DisablestatusIrqs(info,SICR_CTS);
			icount->cts++;
			if ( status & MISCSTATUS_CTS )
				info->input_signal_events.cts_up++;
			else
				info->input_signal_events.cts_down++;
		}
		wake_up_interruptible(&info->status_event_wait_q);
		wake_up_interruptible(&info->event_wait_q);

		if ( (info->flags & ASYNC_CHECK_CD) && 
		     (status & MISCSTATUS_DCD_LATCHED) ) {
			if ( debug_level >= DEBUG_LEVEL_ISR )
				printk("%s CD now %s...", info->device_name,
				       (status & MISCSTATUS_DCD) ? "on" : "off");
			if (status & MISCSTATUS_DCD)
				wake_up_interruptible(&info->open_wait);
			else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
				   (info->flags & ASYNC_CALLOUT_NOHUP))) {
				if ( debug_level >= DEBUG_LEVEL_ISR )
					printk("doing serial hangup...");
				if (info->tty)
					tty_hangup(info->tty);
			}
		}
	
		if ( (info->flags & ASYNC_CTS_FLOW) && 
		     (status & MISCSTATUS_CTS_LATCHED) ) {
			if (info->tty->hw_stopped) {
				if (status & MISCSTATUS_CTS) {
					if ( debug_level >= DEBUG_LEVEL_ISR )
						printk("CTS tx start...");
					if (info->tty)
						info->tty->hw_stopped = 0;
					usc_start_transmitter(info);
					info->pending_bh |= BH_TRANSMIT;
					return;
				}
			} else {
				if (!(status & MISCSTATUS_CTS)) {
					if ( debug_level >= DEBUG_LEVEL_ISR )
						printk("CTS tx stop...");
					if (info->tty)
						info->tty->hw_stopped = 1;
					usc_stop_transmitter(info);
				}
			}
		}
	}

	info->pending_bh |= BH_STATUS;
	
	/* for diagnostics set IRQ flag */
	if ( status & MISCSTATUS_TXC_LATCHED ){
		usc_OutReg( info, SICR,
			(unsigned short)(usc_InReg(info,SICR) & ~(SICR_TXC_ACTIVE+SICR_TXC_INACTIVE)) );
		usc_UnlatchIostatusBits( info, MISCSTATUS_TXC_LATCHED );
		info->irq_occurred = 1;
	}

}	/* end of mgsl_isr_io_pin() */

/* mgsl_isr_transmit_data()
 * 
 * 	Service a transmit data interrupt (async mode only).
 * 
 * Arguments:		info	pointer to device instance data
 * Return Value:	None
 */
void mgsl_isr_transmit_data( struct mgsl_struct *info )
{
	if ( debug_level >= DEBUG_LEVEL_ISR )	
		printk("%s(%d):mgsl_isr_transmit_data xmit_cnt=%d\n",
			__FILE__,__LINE__,info->xmit_cnt);
			
	usc_ClearIrqPendingBits( info, TRANSMIT_DATA );
	
	if (info->tty->stopped || info->tty->hw_stopped) {
		usc_stop_transmitter(info);
		return;
	}
	
	if ( info->xmit_cnt )
		usc_load_txfifo( info );
	else
		info->tx_active = 0;
		
	if (info->xmit_cnt < WAKEUP_CHARS)
		info->pending_bh |= BH_TRANSMIT;

}	/* end of mgsl_isr_transmit_data() */

/* mgsl_isr_receive_data()
 * 
 * 	Service a receive data interrupt. This occurs
 * 	when operating in asynchronous interrupt transfer mode.
 *	The receive data FIFO is flushed to the receive data buffers. 
 * 
 * Arguments:		info		pointer to device instance data
 * Return Value:	None
 */
void mgsl_isr_receive_data( struct mgsl_struct *info )
{
	int Fifocount;
	u16 status;
	unsigned char DataByte;
 	struct tty_struct *tty = info->tty;
 	struct	mgsl_icount *icount = &info->icount;
	
	if ( debug_level >= DEBUG_LEVEL_ISR )	
		printk("%s(%d):mgsl_isr_receive_data\n",
			__FILE__,__LINE__);

	usc_ClearIrqPendingBits( info, RECEIVE_DATA );
	
	/* select FIFO status for RICR readback */
	usc_RCmd( info, RCmd_SelectRicrRxFifostatus );

	/* clear the Wordstatus bit so that status readback */
	/* only reflects the status of this byte */
	usc_OutReg( info, RICR+LSBONLY, (u16)(usc_InReg(info, RICR+LSBONLY) & ~BIT3 ));

	/* flush the receive FIFO */

	while( (Fifocount = (usc_InReg(info,RICR) >> 8)) ) {
		/* read one byte from RxFIFO */
		outw( (inw(info->io_base + CCAR) & 0x0780) | (RDR+LSBONLY),
		      info->io_base + CCAR );
		DataByte = inb( info->io_base + CCAR );

		/* get the status of the received byte */
		status = usc_InReg(info, RCSR);
		if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
				RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) )
			usc_UnlatchRxstatusBits(info,RXSTATUS_ALL);
		
		if (tty->flip.count >= TTY_FLIPBUF_SIZE)
			continue;
			
		*tty->flip.char_buf_ptr = DataByte;
		icount->rx++;
		
		*tty->flip.flag_buf_ptr = 0;
		if ( status & (RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR +
				RXSTATUS_OVERRUN + RXSTATUS_BREAK_RECEIVED) ) {
			printk("rxerr=%04X\n",status);					
			/* update error statistics */
			if ( status & RXSTATUS_BREAK_RECEIVED ) {
				status &= ~(RXSTATUS_FRAMING_ERROR + RXSTATUS_PARITY_ERROR);
				icount->brk++;
			} else if (status & RXSTATUS_PARITY_ERROR) 
				icount->parity++;
			else if (status & RXSTATUS_FRAMING_ERROR)
				icount->frame++;
			else if (status & RXSTATUS_OVERRUN) {
				/* must issue purge fifo cmd before */
				/* 16C32 accepts more receive chars */
				usc_RTCmd(info,RTCmd_PurgeRxFifo);
				icount->overrun++;
			}

			/* discard char if tty control flags say so */					
			if (status & info->ignore_status_mask)
				continue;
				
			status &= info->read_status_mask;
		
			if (status & RXSTATUS_BREAK_RECEIVED) {
				*tty->flip.flag_buf_ptr = TTY_BREAK;
				if (info->flags & ASYNC_SAK)
					do_SAK(tty);
			} else if (status & RXSTATUS_PARITY_ERROR)
				*tty->flip.flag_buf_ptr = TTY_PARITY;
			else if (status & RXSTATUS_FRAMING_ERROR)
				*tty->flip.flag_buf_ptr = TTY_FRAME;
			if (status & RXSTATUS_OVERRUN) {
				/* Overrun is special, since it's
				 * reported immediately, and doesn't
				 * affect the current character
				 */
				if (tty->flip.count < TTY_FLIPBUF_SIZE) {
					tty->flip.count++;
					tty->flip.flag_buf_ptr++;
					tty->flip.char_buf_ptr++;
					*tty->flip.flag_buf_ptr = TTY_OVERRUN;
				}
			}
		}	/* end of if (error) */
		
		tty->flip.flag_buf_ptr++;
		tty->flip.char_buf_ptr++;
		tty->flip.count++;
	}

	if ( debug_level >= DEBUG_LEVEL_ISR ) {
		printk("%s(%d):mgsl_isr_receive_data flip count=%d\n",
			__FILE__,__LINE__,tty->flip.count);
		printk("%s(%d):rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
			__FILE__,__LINE__,icount->rx,icount->brk,
			icount->parity,icount->frame,icount->overrun);
	}
			
	if ( tty->flip.count )
		tty_flip_buffer_push(tty);
}

/* mgsl_isr_misc()
 * 
 * 	Service a miscellaneos interrupt source.
 * 	
 * Arguments:		info		pointer to device extension (instance data)
 * Return Value:	None
 */
void mgsl_isr_misc( struct mgsl_struct *info )
{
	u16 status = usc_InReg( info, MISR );

	if ( debug_level >= DEBUG_LEVEL_ISR )	
		printk("%s(%d):mgsl_isr_misc status=%04X\n",
			__FILE__,__LINE__,status);
			
	usc_ClearIrqPendingBits( info, MISC );
	usc_UnlatchMiscstatusBits( info, status );

}	/* end of mgsl_isr_misc() */

/* mgsl_isr_null()
 *
 * 	Services undefined interrupt vectors from the
 * 	USC. (hence this function SHOULD never be called)
 * 
 * Arguments:		info		pointer to device extension (instance data)
 * Return Value:	None
 */
void mgsl_isr_null( struct mgsl_struct *info )
{

}	/* end of mgsl_isr_null() */

/* mgsl_isr_receive_dma()
 * 
 * 	Service a receive DMA channel interrupt.
 * 	For this driver there are two sources of receive DMA interrupts
 * 	as identified in the Receive DMA mode Register (RDMR):
 * 
 * 	BIT3	EOA/EOL		End of List, all receive buffers in receive
 * 				buffer list have been filled (no more free buffers
 * 				available). The DMA controller has shut down.
 * 
 * 	BIT2	EOB		End of Buffer. This interrupt occurs when a receive
 * 				DMA buffer is terminated in response to completion
 * 				of a good frame or a frame with errors. The status
 * 				of the frame is stored in the buffer entry in the
 * 				list of receive buffer entries.
 * 
 * Arguments:		info		pointer to device instance data
 * Return Value:	None
 */
void mgsl_isr_receive_dma( struct mgsl_struct *info )
{
	u16 status;
	
	/* clear interrupt pending and IUS bit for Rx DMA IRQ */
	usc_OutDmaReg( info, CDIR, BIT9+BIT1 );

	/* Read the receive DMA status to identify interrupt type. */
	/* This also clears the status bits. */
	status = usc_InDmaReg( info, RDMR );

	if ( debug_level >= DEBUG_LEVEL_ISR )	
		printk("%s(%d):mgsl_isr_receive_dma(%s) status=%04X\n",
			__FILE__,__LINE__,info->device_name,status);
			
	info->pending_bh |= BH_RECEIVE;
	
	if ( status & BIT3 ) {
		info->rx_overflow = 1;
		info->icount.buf_overrun++;
	}

}	/* end of mgsl_isr_receive_dma() */

/* mgsl_isr_transmit_dma()
 *
 *	This function services a transmit DMA channel interrupt.
 *
 *	For this driver there is one source of transmit DMA interrupts
 *	as identified in the Transmit DMA Mode Register (TDMR):
 *
 *     	BIT2  EOB       End of Buffer. This interrupt occurs when a
 *     			transmit DMA buffer has been emptied.
 *
 *     	The driver maintains enough transmit DMA buffers to hold at least
 *     	one max frame size transmit frame. When operating in a buffered
 *     	transmit mode, there may be enough transmit DMA buffers to hold at
 *     	least two or more max frame size frames. On an EOB condition,
 *     	determine if there are any queued transmit buffers and copy into
 *     	transmit DMA buffers if we have room.
 *
 * Arguments:		info		pointer to device instance data
 * Return Value:	None
 */
void mgsl_isr_transmit_dma( struct mgsl_struct *info )
{
	u16 status;

	/* clear interrupt pending and IUS bit for Tx DMA IRQ */
	usc_OutDmaReg(info, CDIR, BIT8+BIT0 );

	/* Read the transmit DMA status to identify interrupt type. */
	/* This also clears the status bits. */

	status = usc_InDmaReg( info, TDMR );

	if ( debug_level >= DEBUG_LEVEL_ISR )
		printk("%s(%d):mgsl_isr_transmit_dma(%s) status=%04X\n",
			__FILE__,__LINE__,info->device_name,status);

	if ( status & BIT2 ) {
		--info->tx_dma_buffers_used;

		/* if there are transmit frames queued,
		 *  try to load the next one
		 */
		if ( load_next_tx_holding_buffer(info) ) {
			/* if call returns non-zero value, we have
			 * at least one free tx holding buffer
			 */
			info->pending_bh |= BH_TRANSMIT;
		}
	}

}	/* end of mgsl_isr_transmit_dma() */

/* mgsl_interrupt()
 * 
 * 	Interrupt service routine entry point.
 * 	
 * Arguments:
 * 
 * 	irq		interrupt number that caused interrupt
 * 	dev_id		device ID supplied during interrupt registration
 * 	regs		interrupted processor context
 * 	
 * Return Value: None
 */
static void mgsl_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
	struct mgsl_struct * info;
	u16 UscVector;
	u16 DmaVector;

	if ( debug_level >= DEBUG_LEVEL_ISR )	
		printk("%s(%d):mgsl_interrupt(%d)entry.\n",
			__FILE__,__LINE__,irq);

	info = (struct mgsl_struct *)dev_id;	
	if (!info)
		return;
		
	spin_lock(&info->irq_spinlock);

	for(;;) {
		/* Read the interrupt vectors from hardware. */
		UscVector = usc_InReg(info, IVR) >> 9;
		DmaVector = usc_InDmaReg(info, DIVR);
		
		if ( debug_level >= DEBUG_LEVEL_ISR )	
			printk("%s(%d):%s UscVector=%08X DmaVector=%08X\n",
				__FILE__,__LINE__,info->device_name,UscVector,DmaVector);
			
		if ( !UscVector && !DmaVector )
			break;
			
		/* Dispatch interrupt vector */