patch-2.3.6 linux/drivers/net/irda/smc-ircc.c

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diff -u --recursive --new-file v2.3.5/linux/drivers/net/irda/smc-ircc.c linux/drivers/net/irda/smc-ircc.c
@@ -0,0 +1,969 @@
+/*********************************************************************
+ *                
+ * Filename:      smc-ircc.c
+ * Version:       0.1
+ * Description:   Driver for the SMC Infrared Communications Controller (SMC)
+ * Status:        Experimental.
+ * Author:        Thomas Davis (tadavis@jps.net)
+ * Created at:    
+ * Modified at:   Wed May 19 15:30:08 1999
+ * Modified by:   Dag Brattli <dagb@cs.uit.no>
+ * 
+ *     Copyright (c) 1998-1999 Thomas Davis, All Rights Reserved.
+ *      
+ *     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.
+ *  
+ *     I, Thomas Davis, admit no liability nor provide warranty for any
+ *     of this software. This material is provided "AS-IS" and at no charge.
+ *
+ *     Applicable Models : Fujitsu Lifebook 635t
+ *			   Sony PCG-505TX (gets DMA wrong.)
+ *
+ ********************************************************************/
+
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/malloc.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/byteorder.h>
+
+#include <net/irda/wrapper.h>
+#include <net/irda/irda.h>
+#include <net/irda/irmod.h>
+#include <net/irda/irlap_frame.h>
+#include <net/irda/irda_device.h>
+
+#include <net/irda/smc-ircc.h>
+#include <net/irda/irport.h>
+
+static char *driver_name = "smc-ircc";
+
+#define CHIP_IO_EXTENT 8
+
+static unsigned int io[]  = { 0x2e8, 0x140, ~0, ~0 };
+static unsigned int io2[] = { 0x2f8, 0x3e8, 0, 0};
+
+static struct ircc_cb *dev_self[] = { NULL, NULL, NULL, NULL};
+
+/* Some prototypes */
+static int  ircc_open( int i, unsigned int iobase, unsigned int board_addr);
+static int  ircc_close( struct irda_device *idev);
+static int  ircc_probe( int iobase, int board_addr);
+static int  ircc_dma_receive( struct irda_device *idev); 
+static int  ircc_dma_receive_complete(struct irda_device *idev, int iobase);
+static int  ircc_hard_xmit( struct sk_buff *skb, struct device *dev);
+static void ircc_dma_write( struct irda_device *idev, int iobase);
+static void ircc_change_speed( struct irda_device *idev, int baud);
+static void ircc_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static void ircc_wait_until_sent( struct irda_device *idev);
+static int  ircc_is_receiving( struct irda_device *idev);
+
+static int  ircc_net_init( struct device *dev);
+static int  ircc_net_open( struct device *dev);
+static int  ircc_net_close( struct device *dev);
+
+static int ircc_debug=3;
+static int ircc_irq=255;
+static int ircc_dma=255;
+
+static inline void register_bank(int port, int bank)
+{
+        outb(((inb(port+UART_MASTER) & 0xF0) | (bank & 0x07)),
+             port+UART_MASTER);
+}
+
+static inline unsigned int serial_in(int port, int offset)
+{
+        return inb(port+offset);
+}
+
+static inline void serial_out(int port, int offset, int value)
+{
+        outb(value, port+offset);
+}
+
+/*
+ * Function ircc_init ()
+ *
+ *    Initialize chip. Just try to find out how many chips we are dealing with
+ *    and where they are
+ */
+__initfunc(int ircc_init(void))
+{
+	int i;
+
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+	for ( i=0; (io[i] < 2000) && (i < 4); i++) {
+		int ioaddr = io[i];
+		if (check_region(ioaddr, CHIP_IO_EXTENT))
+			continue;
+		if (ircc_open( i, io[i], io2[i]) == 0)
+			return 0;
+	}
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+
+	return -ENODEV;
+}
+
+/*
+ * Function ircc_cleanup ()
+ *
+ *    Close all configured chips
+ *
+ */
+#ifdef MODULE
+static void ircc_cleanup(void)
+{
+	int i;
+
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	for ( i=0; i < 4; i++) {
+		if ( dev_self[i])
+			ircc_close( &(dev_self[i]->idev));
+	}
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+}
+#endif /* MODULE */
+
+/*
+ * Function ircc_open (iobase, irq)
+ *
+ *    Open driver instance
+ *
+ */
+static int ircc_open( int i, unsigned int iobase, unsigned int iobase2)
+{
+	struct ircc_cb *self;
+	struct irda_device *idev;
+	int ret;
+	int config;
+
+	DEBUG( ircc_debug, __FUNCTION__ " -->\n");
+
+	if ((config = ircc_probe( iobase, iobase2)) == -1) {
+	        DEBUG(ircc_debug, 
+		      __FUNCTION__ ": addr 0x%04x - no device found!\n", iobase);
+		return -1;
+	}
+	
+	/*
+	 *  Allocate new instance of the driver
+	 */
+	self = kmalloc( sizeof(struct ircc_cb), GFP_KERNEL);
+	if ( self == NULL) {
+		printk( KERN_ERR "IrDA: Can't allocate memory for "
+			"IrDA control block!\n");
+		return -ENOMEM;
+	}
+	memset(self, 0, sizeof(struct ircc_cb));
+   
+	/* Need to store self somewhere */
+	dev_self[i] = self;
+
+	idev = &self->idev;
+
+	/* Initialize IO */
+	idev->io.iobase    = iobase;
+        idev->io.iobase2   = iobase2; /* Used by irport */
+        idev->io.irq       = config >> 4 & 0x0f;
+	if (ircc_irq < 255) {
+	        printk(KERN_INFO "smc: Overriding IRQ - chip says %d, using %d\n",
+		      idev->io.irq, ircc_irq);
+		idev->io.irq = ircc_irq;
+	}
+        idev->io.io_ext    = CHIP_IO_EXTENT;
+        idev->io.io_ext2   = 8;       /* Used by irport */
+        idev->io.dma       = config & 0x0f;
+	if (ircc_dma < 255) {
+	        printk(KERN_INFO "smc: Overriding DMA - chip says %d, using %d\n",
+		      idev->io.dma, ircc_dma);
+		idev->io.dma = ircc_dma;
+	}
+        idev->io.fifo_size = 16;
+
+	/* Lock the port that we need */
+	ret = check_region( idev->io.iobase, idev->io.io_ext);
+	if ( ret < 0) { 
+		DEBUG( 0, __FUNCTION__ ": can't get iobase of 0x%03x\n",
+		       idev->io.iobase);
+		/* ircc_cleanup( self->idev);  */
+		return -ENODEV;
+	}
+	ret = check_region( idev->io.iobase2, idev->io.io_ext2);
+	if ( ret < 0) { 
+		DEBUG( 0, __FUNCTION__ ": can't get iobase of 0x%03x\n",
+		       idev->io.iobase2);
+		/* ircc_cleanup( self->idev);  */
+		return -ENODEV;
+	}
+	request_region( idev->io.iobase, idev->io.io_ext, idev->name);
+        request_region( idev->io.iobase2, idev->io.io_ext2, idev->name);
+
+	/* Initialize QoS for this device */
+	irda_init_max_qos_capabilies( &idev->qos);
+	
+#if 1
+	/* The only value we must override it the baudrate */
+	idev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
+		IR_115200|IR_576000|IR_1152000|(IR_4000000 << 8);
+#else
+	/* The only value we must override it the baudrate */
+	idev->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
+		IR_115200;
+#endif
+
+	idev->qos.min_turn_time.bits = 0x07;
+	irda_qos_bits_to_value( &idev->qos);
+
+	idev->flags = IFF_FIR|IFF_SIR|IFF_DMA|IFF_PIO;
+	
+	/* Specify which buffer allocation policy we need */
+	idev->rx_buff.flags = GFP_KERNEL | GFP_DMA;
+	idev->tx_buff.flags = GFP_KERNEL | GFP_DMA;
+
+	/* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
+	idev->rx_buff.truesize = 4000; 
+	idev->tx_buff.truesize = 4000;
+	
+	/* Initialize callbacks */
+	idev->change_speed    = ircc_change_speed;
+	idev->wait_until_sent = ircc_wait_until_sent;
+	idev->is_receiving    = ircc_is_receiving;
+     
+	/* Override the network functions we need to use */
+	idev->netdev.init            = ircc_net_init;
+	idev->netdev.hard_start_xmit = ircc_hard_xmit;
+	idev->netdev.open            = ircc_net_open;
+	idev->netdev.stop            = ircc_net_close;
+
+	irport_start(idev, iobase2);
+
+	/* Open the IrDA device */
+	irda_device_open( idev, driver_name, self);
+	
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+	return 0;
+}
+
+/*
+ * Function ircc_close (idev)
+ *
+ *    Close driver instance
+ *
+ */
+static int ircc_close( struct irda_device *idev)
+{
+	int iobase;
+
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	ASSERT( idev != NULL, return -1;);
+	ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return -1;);
+
+        iobase = idev->io.iobase;
+
+	irport_stop(idev, idev->io.iobase2);
+
+	register_bank(iobase, 0);
+	serial_out(iobase, UART_IER, 0);
+	serial_out(iobase, UART_MASTER, UART_MASTER_RESET);
+
+	register_bank(iobase, 1);
+
+        serial_out(iobase, UART_SCE_CFGA, 
+		   UART_CFGA_IRDA_SIR_A | UART_CFGA_TX_POLARITY);
+        serial_out(iobase, UART_SCE_CFGB, UART_CFGB_IR);
+ 
+	/* Release the PORT that this driver is using */
+	DEBUG( ircc_debug, 
+	       __FUNCTION__ ": releasing 0x%03x\n", idev->io.iobase);
+
+	release_region( idev->io.iobase, idev->io.io_ext);
+
+	if ( idev->io.iobase2) {
+		DEBUG( ircc_debug, __FUNCTION__ ": releasing 0x%03x\n", 
+		       idev->io.iobase2);
+		release_region( idev->io.iobase2, idev->io.io_ext2);
+	}
+
+	irda_device_close( idev);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+	return 0;
+}
+
+/*
+ * Function ircc_probe (iobase, board_addr, irq, dma)
+ *
+ *    Returns non-negative on success.
+ *
+ */
+static int ircc_probe( int iobase, int iobase2) 
+{
+	int version = 1;
+	int low, high, chip, config, dma, irq;
+	
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	register_bank(iobase, 3);
+	high = serial_in(iobase, UART_ID_HIGH);
+	low = serial_in(iobase, UART_ID_LOW);
+	chip = serial_in(iobase, UART_CHIP_ID);
+	version = serial_in(iobase, UART_VERSION);
+	config = serial_in(iobase, UART_INTERFACE);
+	irq = config >> 4 & 0x0f;
+	dma = config & 0x0f;
+
+	if (high == 0x10 && low == 0xb8 && chip == 0xf1) {
+		DEBUG(0, "SMC IrDA Controller found; version = %d, "
+		      "port 0x%04x, dma %d, interrupt %d\n",
+		      version, iobase, dma, irq);
+	} else {
+		return -1;
+	}
+
+	serial_out(iobase, UART_MASTER, 0);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+
+	return config;
+}
+
+/*
+ * Function ircc_change_speed (idev, baud)
+ *
+ *    Change the speed of the device
+ *
+ */
+static void ircc_change_speed( struct irda_device *idev, int speed)
+{
+	struct ircc_cb *self;
+	int iobase, ir_mode, select, fast; 
+
+	DEBUG(ircc_debug+1, __FUNCTION__ " -->\n");
+
+	ASSERT(idev != NULL, return;);
+	ASSERT(idev->magic == IRDA_DEVICE_MAGIC, return;);
+
+	self = idev->priv;
+	iobase = idev->io.iobase;
+
+	/* Update accounting for new speed */
+	idev->io.baudrate = speed;
+
+	switch ( speed) {
+	case 9600:
+	case 19200:
+	case 37600:
+	case 57600:
+	case 115200:
+	        DEBUG(ircc_debug+1, 
+		      __FUNCTION__ ": using irport to change speed to %d\n",
+		      speed);
+		register_bank(iobase, 0);
+		serial_out(iobase, UART_IER, 0);
+		serial_out(iobase, UART_MASTER, UART_MASTER_RESET);
+		serial_out(iobase, UART_MASTER, UART_MASTER_INT_EN);
+		irport_start(idev, idev->io.iobase2);
+		irport_change_speed( idev, speed);
+		return;
+		break;
+
+	case 576000:		
+		ir_mode = UART_CFGA_IRDA_HDLC;
+		select = 0;
+		fast = 0;
+		DEBUG( ircc_debug, __FUNCTION__ ": handling baud of 576000\n");
+		break;
+	case 1152000:
+		ir_mode = UART_CFGA_IRDA_HDLC;
+		select = UART_1152;
+		fast = 0;
+		DEBUG(ircc_debug, __FUNCTION__ ": handling baud of 1152000\n");
+		break;
+	case 4000000:
+		ir_mode = UART_CFGA_IRDA_4PPM;
+		select = 0;
+		fast = UART_LCR_A_FAST;
+		DEBUG(ircc_debug, __FUNCTION__ ": handling baud of 4000000\n");
+		break;
+	default:
+		DEBUG( 0, __FUNCTION__ ": unknown baud rate of %d\n", speed);
+		return;
+	}
+
+#if 0
+	serial_out(idev->io.iobase2, 4, 0x08);
+#endif
+
+	serial_out(iobase, UART_MASTER, UART_MASTER_RESET);
+
+	register_bank(iobase, 0);
+	serial_out(iobase, UART_IER, 0);
+	
+       	irport_stop(idev, idev->io.iobase2);
+
+	idev->netdev.tbusy = 0;
+	
+	register_bank(iobase, 1);
+
+	serial_out(iobase, UART_SCE_CFGA, 
+		   ((serial_in(iobase, UART_SCE_CFGA) & 0x87) | ir_mode));
+
+	serial_out(iobase, UART_SCE_CFGB,
+		   ((serial_in(iobase, UART_SCE_CFGB) & 0x3f) | UART_CFGB_IR));
+
+	(void) serial_in(iobase, UART_FIFO_THRESHOLD);
+	serial_out(iobase, UART_FIFO_THRESHOLD, 64);
+
+	register_bank(iobase, 4);
+
+	serial_out(iobase, UART_CONTROL,
+		   (serial_in(iobase, UART_CONTROL) & 0x30) 
+		   | select | UART_CRC );
+
+	register_bank(iobase, 0);
+
+	serial_out(iobase, UART_LCR_A, fast);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+}
+
+/*
+ * Function ircc_hard_xmit (skb, dev)
+ *
+ *    Transmit the frame!
+ *
+ */
+static int ircc_hard_xmit( struct sk_buff *skb, struct device *dev)
+{
+	struct irda_device *idev;
+	int iobase;
+	int mtt;
+
+	DEBUG(ircc_debug+1, __FUNCTION__ " -->\n");
+	idev = (struct irda_device *) dev->priv;
+
+	ASSERT( idev != NULL, return 0;);
+	ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return 0;);
+
+	iobase = idev->io.iobase;
+
+	DEBUG(ircc_debug+1, __FUNCTION__ "(%ld), skb->len=%d\n", jiffies, (int) skb->len);
+
+	/* Use irport for SIR speeds */
+	if (idev->io.baudrate <= 115200) {
+		DEBUG(ircc_debug+1, __FUNCTION__ ": calling irport_hard_xmit\n");
+		return irport_hard_xmit(skb, dev);
+	}
+	
+	DEBUG(ircc_debug, __FUNCTION__ ": using dma; len=%d\n", skb->len);
+
+	/* Lock transmit buffer */
+	if (irda_lock((void *) &dev->tbusy) == FALSE)
+		return -EBUSY;
+
+	memcpy( idev->tx_buff.head, skb->data, skb->len);
+
+	/* Make sure that the length is a multiple of 16 bits */
+	if ( skb->len & 0x01)
+		skb->len++;
+
+	idev->tx_buff.len = skb->len;
+	idev->tx_buff.data = idev->tx_buff.head;
+#if 0
+	idev->tx_buff.offset = 0;
+#endif
+	
+	mtt = irda_get_mtt( skb);
+	
+	/* Use udelay for delays less than 50 us. */
+	if (mtt)
+		udelay( mtt);
+	
+	ircc_dma_write( idev, iobase);
+	
+	dev_kfree_skb( skb);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+	return 0;
+}
+
+/*
+ * Function ircc_dma_xmit (idev, iobase)
+ *
+ *    Transmit data using DMA
+ *
+ */
+static void ircc_dma_write( struct irda_device *idev, int iobase)
+{
+	struct ircc_cb *self;
+
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	ASSERT( idev != NULL, return;);
+	ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return;);
+
+	self = idev->priv;
+	iobase = idev->io.iobase;
+
+	setup_dma( idev->io.dma, idev->tx_buff.data, idev->tx_buff.len, 
+		   DMA_MODE_WRITE);
+	
+	idev->io.direction = IO_XMIT;
+
+	serial_out(idev->io.iobase2, 4, 0x08);
+
+	register_bank(iobase, 4);
+	serial_out(iobase, UART_CONTROL, 
+		   (serial_in(iobase, UART_CONTROL) & 0xF0));
+
+	serial_out(iobase, UART_BOF_COUNT_LO, 2);
+	serial_out(iobase, UART_BRICKWALL_CNT_LO, 0);
+#if 1
+	serial_out(iobase, UART_BRICKWALL_TX_CNT_HI, idev->tx_buff.len >> 8);
+	serial_out(iobase, UART_TX_SIZE_LO, idev->tx_buff.len & 0xff);
+#else
+	serial_out(iobase, UART_BRICKWALL_TX_CNT_HI, 0);
+	serial_out(iobase, UART_TX_SIZE_LO, 0);
+#endif
+
+	register_bank(iobase, 1);
+	serial_out(iobase, UART_SCE_CFGB,
+		   serial_in(iobase, UART_SCE_CFGB) | UART_CFGB_DMA_ENABLE);
+
+	register_bank(iobase, 0);
+
+	serial_out(iobase, UART_IER, UART_IER_ACTIVE_FRAME | UART_IER_EOM);
+	serial_out(iobase, UART_LCR_B,
+		   UART_LCR_B_SCE_TRANSMIT|UART_LCR_B_SIP_ENABLE);
+
+	serial_out(iobase, UART_MASTER, UART_MASTER_INT_EN);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+}
+
+/*
+ * Function ircc_dma_xmit_complete (idev)
+ *
+ *    The transfer of a frame in finished. This function will only be called 
+ *    by the interrupt handler
+ *
+ */
+static void ircc_dma_xmit_complete( struct irda_device *idev, int underrun)
+{
+	struct ircc_cb *self;
+	int iobase, d;
+
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	ASSERT( idev != NULL, return;);
+	ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return;);
+
+	register_bank(idev->io.iobase, 1);
+
+	serial_out(idev->io.iobase, UART_SCE_CFGB,
+		   serial_in(idev->io.iobase, UART_SCE_CFGB) &
+		   ~UART_CFGB_DMA_ENABLE);
+
+	d = get_dma_residue(idev->io.dma);
+
+	DEBUG(ircc_debug, __FUNCTION__ ": dma residue = %d, len=%d, sent=%d\n", 
+	      d, idev->tx_buff.len, idev->tx_buff.len - d);
+
+	self = idev->priv;
+
+	iobase = idev->io.iobase;
+
+	/* Check for underrrun! */
+	if ( underrun) {
+		idev->stats.tx_errors++;
+		idev->stats.tx_fifo_errors++;		
+	} else {
+		idev->stats.tx_packets++;
+		idev->stats.tx_bytes +=  idev->tx_buff.len;
+	}
+
+	/* Unlock tx_buff and request another frame */
+	idev->netdev.tbusy = 0; /* Unlock */
+	idev->media_busy = FALSE;
+	
+	/* Tell the network layer, that we can accept more frames */
+	mark_bh( NET_BH);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+}
+
+/*
+ * Function ircc_dma_receive (idev)
+ *
+ *    Get ready for receiving a frame. The device will initiate a DMA
+ *    if it starts to receive a frame.
+ *
+ */
+static int ircc_dma_receive( struct irda_device *idev) 
+{
+	struct ircc_cb *self;
+	int iobase;
+
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	ASSERT( idev != NULL, return -1;);
+	ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return -1;);
+
+	self = idev->priv;
+	iobase= idev->io.iobase;
+
+	setup_dma( idev->io.dma, idev->rx_buff.data, idev->rx_buff.truesize, 
+		   DMA_MODE_READ);
+	
+	/* driver->media_busy = FALSE; */
+	idev->io.direction = IO_RECV;
+	idev->rx_buff.data = idev->rx_buff.head;
+#if 0
+	idev->rx_buff.offset = 0;
+#endif
+
+	register_bank(iobase, 4);
+	serial_out(iobase, UART_CONTROL, 
+		   (serial_in(iobase, UART_CONTROL) &0xF0));
+	serial_out(iobase, UART_BOF_COUNT_LO, 2);
+	serial_out(iobase, UART_BRICKWALL_CNT_LO, 0);
+	serial_out(iobase, UART_BRICKWALL_TX_CNT_HI, 0);
+	serial_out(iobase, UART_TX_SIZE_LO, 0);
+	serial_out(iobase, UART_RX_SIZE_HI, 0);
+	serial_out(iobase, UART_RX_SIZE_LO, 0);
+
+	register_bank(iobase, 0);
+	serial_out(iobase, 
+		   UART_LCR_B, UART_LCR_B_SCE_RECEIVE | UART_LCR_B_SIP_ENABLE);
+	
+	register_bank(iobase, 1);
+	serial_out(iobase, UART_SCE_CFGB,
+		   serial_in(iobase, UART_SCE_CFGB) | 
+		   UART_CFGB_DMA_ENABLE | UART_CFGB_DMA_BURST);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+	return 0;
+}
+
+/*
+ * Function ircc_dma_receive_complete (idev)
+ *
+ *    Finished with receiving frames
+ *
+ *    
+ */
+static int ircc_dma_receive_complete( struct irda_device *idev, int iobase)
+{
+	struct sk_buff *skb;
+	struct ircc_cb *self;
+	int len, msgcnt;
+
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	self = idev->priv;
+
+	msgcnt = serial_in(idev->io.iobase, UART_LCR_B) & 0x08;
+
+	DEBUG(ircc_debug, __FUNCTION__ ": dma count = %d\n",
+	      get_dma_residue(idev->io.dma));
+
+	len = idev->rx_buff.truesize - get_dma_residue(idev->io.dma) - 4;
+
+	DEBUG(ircc_debug, __FUNCTION__ ": msgcnt = %d, len=%d\n", msgcnt, len);
+
+	skb = dev_alloc_skb( len+1);
+
+	if (skb == NULL)  {
+		printk( KERN_INFO __FUNCTION__ 
+			": memory squeeze, dropping frame.\n");
+		return FALSE;
+	}
+			
+	/* Make sure IP header gets aligned */
+	skb_reserve( skb, 1); 
+	skb_put( skb, len);
+
+	memcpy(skb->data, idev->rx_buff.data, len);
+	idev->stats.rx_packets++;
+
+	skb->dev = &idev->netdev;
+	skb->mac.raw  = skb->data;
+	skb->protocol = htons(ETH_P_IRDA);
+	netif_rx( skb);
+
+	register_bank(idev->io.iobase, 1);
+	serial_out(idev->io.iobase, UART_SCE_CFGB,
+		   serial_in(idev->io.iobase, UART_SCE_CFGB) &
+		   ~UART_CFGB_DMA_ENABLE);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+	return TRUE;
+}
+
+/*
+ * Function ircc_interrupt (irq, dev_id, regs)
+ *
+ *    An interrupt from the chip has arrived. Time to do some work
+ *
+ */
+static void ircc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	int iobase, iir;
+
+	struct irda_device *idev = (struct irda_device *) dev_id;
+
+	DEBUG(ircc_debug+1, __FUNCTION__ " -->\n");
+
+	if (idev == NULL) {
+		printk( KERN_WARNING "%s: irq %d for unknown device.\n", 
+			driver_name, irq);
+		return;
+	}
+	
+	if (idev->io.baudrate <= 115200) {
+		DEBUG(ircc_debug+1, __FUNCTION__ 
+		      ": routing interrupt to irport_interrupt\n");
+		return irport_interrupt( irq, dev_id, regs);
+	}
+
+	iobase = idev->io.iobase;
+
+	idev->netdev.interrupt = 1;
+
+	serial_out(iobase, UART_MASTER, 0);
+
+	register_bank(iobase, 0);
+
+	iir = serial_in(iobase, UART_IIR);
+
+	serial_out(iobase, UART_IER, 0);
+
+	DEBUG(ircc_debug, __FUNCTION__ ": iir = 0x%02x\n", iir);
+
+	if (iir & UART_IIR_EOM) {
+	        DEBUG(ircc_debug, __FUNCTION__ ": UART_IIR_EOM\n");
+		if (idev->io.direction == IO_RECV) {
+			ircc_dma_receive_complete(idev, iobase);
+		} else {
+			ircc_dma_xmit_complete(idev, iobase);
+		}
+		ircc_dma_receive(idev);
+	}
+
+	if (iir & UART_IIR_ACTIVE_FRAME) {
+	        DEBUG(ircc_debug, __FUNCTION__ ": UART_IIR_ACTIVE_FRAME\n");
+		idev->rx_buff.state = INSIDE_FRAME;
+#if 0
+		ircc_dma_receive(idev);
+#endif
+	}
+
+	if (iir & UART_IIR_RAW_MODE) {
+		DEBUG(ircc_debug, __FUNCTION__ ": IIR RAW mode interrupt.\n");
+	}
+
+	idev->netdev.interrupt = 0;
+
+	register_bank(iobase, 0);
+	serial_out(iobase, UART_IER, UART_IER_ACTIVE_FRAME|UART_IER_EOM);
+	serial_out(iobase, UART_MASTER, UART_MASTER_INT_EN);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+}
+
+/*
+ * Function ircc_wait_until_sent (idev)
+ *
+ *    This function should put the current thread to sleep until all data 
+ *    have been sent, so it is safe to change the speed.
+ */
+static void ircc_wait_until_sent( struct irda_device *idev)
+{
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	/* Just delay 60 ms */
+	current->state = TASK_INTERRUPTIBLE;
+	schedule_timeout(6);
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+}
+
+/*
+ * Function ircc_is_receiving (idev)
+ *
+ *    Return TRUE is we are currently receiving a frame
+ *
+ */
+static int ircc_is_receiving( struct irda_device *idev)
+{
+	int status = FALSE;
+	/* int iobase; */
+
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	ASSERT( idev != NULL, return FALSE;);
+	ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return FALSE;);
+
+	DEBUG(ircc_debug, __FUNCTION__ ": dma count = %d\n",
+	      get_dma_residue(idev->io.dma));
+
+	status = ( idev->rx_buff.state != OUTSIDE_FRAME);
+	
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+
+	return status;
+}
+
+/*
+ * Function ircc_net_init (dev)
+ *
+ *    Initialize network device
+ *
+ */
+static int ircc_net_init( struct device *dev)
+{
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+
+	/* Setup to be a normal IrDA network device driver */
+	irda_device_setup( dev);
+
+	/* Insert overrides below this line! */
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+	return 0;
+}
+
+
+/*
+ * Function ircc_net_open (dev)
+ *
+ *    Start the device
+ *
+ */
+static int ircc_net_open( struct device *dev)
+{
+	struct irda_device *idev;
+	int iobase;
+	
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+	
+	ASSERT( dev != NULL, return -1;);
+	idev = (struct irda_device *) dev->priv;
+	
+	ASSERT( idev != NULL, return 0;);
+	ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return 0;);
+	
+	iobase = idev->io.iobase;
+
+	if (request_irq( idev->io.irq, ircc_interrupt, 0, idev->name, 
+			 (void *) idev)) {
+		return -EAGAIN;
+	}
+	/*
+	 * Always allocate the DMA channel after the IRQ,
+	 * and clean up on failure.
+	 */
+	if (request_dma(idev->io.dma, idev->name)) {
+		free_irq( idev->io.irq, idev);
+		return -EAGAIN;
+	}
+		
+	/* Ready to play! */
+	dev->tbusy = 0;
+	dev->interrupt = 0;
+	dev->start = 1;
+
+	/* turn on interrupts */
+	
+	MOD_INC_USE_COUNT;
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+	return 0;
+}
+
+/*
+ * Function ircc_net_close (dev)
+ *
+ *    Stop the device
+ *
+ */
+static int ircc_net_close(struct device *dev)
+{
+	struct irda_device *idev;
+	int iobase;
+
+	DEBUG(ircc_debug, __FUNCTION__ " -->\n");
+	
+	/* Stop device */
+	dev->tbusy = 1;
+	dev->start = 0;
+
+	ASSERT( dev != NULL, return -1;);
+	idev = (struct irda_device *) dev->priv;
+	
+	ASSERT( idev != NULL, return 0;);
+	ASSERT( idev->magic == IRDA_DEVICE_MAGIC, return 0;);
+	
+	iobase = idev->io.iobase;
+
+	disable_dma( idev->io.dma);
+
+	/* Disable interrupts */
+       
+	free_irq( idev->io.irq, idev);
+	free_dma( idev->io.dma);
+
+	MOD_DEC_USE_COUNT;
+
+	DEBUG( ircc_debug, "--> " __FUNCTION__ "\n");
+	return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Thomas Davis <tadavis@jps.net>");
+MODULE_DESCRIPTION("SMC IrCC controller driver");
+MODULE_PARM(ircc_debug,"1i");
+MODULE_PARM(ircc_dma, "1i");
+MODULE_PARM(ircc_irq, "1i");
+
+/*
+ * Function init_module (void)
+ *
+ *    
+ *
+ */
+int init_module(void)
+{
+	return ircc_init();
+}
+
+/*
+ * Function cleanup_module (void)
+ *
+ *    
+ *
+ */
+void cleanup_module(void)
+{
+	ircc_cleanup();
+}
+
+#endif

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)