patch-2.3.38 linux/drivers/net/irda/nsc_fir.c

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diff -u --recursive --new-file v2.3.37/linux/drivers/net/irda/nsc_fir.c linux/drivers/net/irda/nsc_fir.c
@@ -0,0 +1,1825 @@
+/*********************************************************************
+ *                
+ * Filename:      nsc_fir.c
+ * Version:       1.0
+ * Description:   Driver for the NSC PC'108 and PC'338 IrDA chipsets
+ * Status:        Stable.
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Sat Nov  7 21:43:15 1998
+ * Modified at:   Wed Jan  5 13:59:21 2000
+ * Modified by:   Dag Brattli <dagb@cs.uit.no>
+ * 
+ *     Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>
+ *     Copyright (c) 1998 Lichen Wang, <lwang@actisys.com>
+ *     Copyright (c) 1998 Actisys Corp., www.actisys.com
+ *     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.
+ *  
+ *     Neither Dag Brattli nor University of Tromsų admit liability nor
+ *     provide warranty for any of this software. This material is 
+ *     provided "AS-IS" and at no charge.
+ *
+ *     Notice that all functions that needs to access the chip in _any_
+ *     way, must save BSR register on entry, and restore it on exit. 
+ *     It is _very_ important to follow this policy!
+ *
+ *         __u8 bank;
+ *     
+ *         bank = inb(iobase+BSR);
+ *  
+ *         do_your_stuff_here();
+ *
+ *         outb(bank, iobase+BSR);
+ *
+ *    If you find bugs in this file, its very likely that the same bug
+ *    will also be in w83977af_ir.c since the implementations are quite
+ *    similar.
+ *     
+ ********************************************************************/
+
+#include <linux/module.h>
+#include <linux/config.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/init.h>
+#include <linux/rtnetlink.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/byteorder.h>
+
+#ifdef CONFIG_APM
+#include <linux/apm_bios.h>
+#endif
+
+#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/nsc_fir.h>
+
+#define CHIP_IO_EXTENT 8
+#define BROKEN_DONGLE_ID
+
+/* 
+ * Define if you have multiple NSC IrDA controllers in your machine. Not
+ * enabled by default since some single chips detects at multiple addresses
+ */
+#undef  CONFIG_NSC_FIR_MULTIPLE 
+
+static char *driver_name = "nsc_fir";
+
+/* Module parameters */
+static int qos_mtt_bits = 0x07;  /* 1 ms or more */
+static int dongle_id = 0;
+
+static unsigned int io[]  = { 0x2f8, 0x2f8, 0x2f8, 0x2f8, 0x2f8 };
+static unsigned int io2[] = { 0x150, 0x398, 0xea, 0x15c, 0x2e };
+static unsigned int irq[] = { 3, 3, 3, 3, 3 };
+static unsigned int dma[] = { 0, 0, 0, 0, 3 };
+
+static struct nsc_fir_cb *dev_self[] = { NULL, NULL, NULL, NULL, NULL };
+
+static char *dongle_types[] = {
+	"Differential serial interface",
+	"Differential serial interface",
+	"Reserved",
+	"Reserved",
+	"Sharp RY5HD01",
+	"Reserved",
+	"Single-ended serial interface",
+	"Consumer-IR only",
+	"HP HSDL-2300, HP HSDL-3600/HSDL-3610",
+	"IBM31T1100 or Temic TFDS6000/TFDS6500",
+	"Reserved",
+	"Reserved",
+	"HP HSDL-1100/HSDL-2100",
+	"HP HSDL-1100/HSDL-2100"
+	"Supports SIR Mode only",
+	"No dongle connected",
+};
+
+/* Some prototypes */
+static int  nsc_fir_open(int i, unsigned int iobase, unsigned int board_addr, 
+			 unsigned int irq, unsigned int dma);
+#ifdef MODULE
+static int  nsc_fir_close(struct nsc_fir_cb *self);
+#endif /* MODULE */
+static int  nsc_fir_probe(int iobase, int board_addr, int irq, int dma);
+static void nsc_fir_pio_receive(struct nsc_fir_cb *self);
+static int  nsc_fir_dma_receive(struct nsc_fir_cb *self); 
+static int  nsc_fir_dma_receive_complete(struct nsc_fir_cb *self, int iobase);
+static int  nsc_fir_hard_xmit_sir(struct sk_buff *skb, struct net_device *dev);
+static int  nsc_fir_hard_xmit_fir(struct sk_buff *skb, struct net_device *dev);
+static int  nsc_fir_pio_write(int iobase, __u8 *buf, int len, int fifo_size);
+static void nsc_fir_dma_xmit(struct nsc_fir_cb *self, int iobase);
+static void nsc_fir_change_speed(struct nsc_fir_cb *self, __u32 baud);
+static void nsc_fir_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static int  nsc_fir_is_receiving(struct nsc_fir_cb *self);
+static int  nsc_fir_read_dongle_id (int iobase);
+static void nsc_fir_init_dongle_interface (int iobase, int dongle_id);
+
+static int  nsc_fir_net_init(struct net_device *dev);
+static int  nsc_fir_net_open(struct net_device *dev);
+static int  nsc_fir_net_close(struct net_device *dev);
+static int  nsc_fir_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static struct net_device_stats *nsc_fir_net_get_stats(struct net_device *dev);
+#ifdef CONFIG_APM
+static int nsc_fir_apmproc(apm_event_t event);
+#endif /* CONFIG_APM */
+/*
+ * Function nsc_fir_init ()
+ *
+ *    Initialize chip. Just try to find out how many chips we are dealing with
+ *    and where they are
+ */
+int __init nsc_fir_init(void)
+{
+	int ret = -ENODEV;
+	int ioaddr;
+	int i;
+
+#ifdef CONFIG_APM
+	apm_register_callback(nsc_fir_apmproc);
+#endif /* CONFIG_APM */
+
+	for (i=0; (io[i] < 2000) && (i < 5); i++) {
+		ioaddr = io[i];
+		if (check_region(ioaddr, CHIP_IO_EXTENT) < 0)
+			continue;
+		if (nsc_fir_open(i, io[i], io2[i], irq[i], dma[i]) == 0)
+		{
+#ifdef CONFIG_NSC_FIR_MULTIPLE
+			ret = 0;
+#else
+		        return 0;
+#endif
+		}
+	}
+
+	return ret;
+}
+
+/*
+ * Function nsc_fir_cleanup ()
+ *
+ *    Close all configured chips
+ *
+ */
+#ifdef MODULE
+static void nsc_fir_cleanup(void)
+{
+	int i;
+
+        IRDA_DEBUG(4, __FUNCTION__ "()\n");
+
+#ifdef CONFIG_APM
+	apm_unregister_callback(nsc_fir_apmproc);
+#endif /* CONFIG_APM */
+
+
+	for (i=0; i < 5; i++) {
+		if (dev_self[i])
+			nsc_fir_close(dev_self[i]);
+	}
+}
+#endif /* MODULE */
+
+/*
+ * Function nsc_fir_open (iobase, irq)
+ *
+ *    Open driver instance
+ *
+ */
+static int 
+nsc_fir_open(int i, unsigned int iobase, unsigned int board_addr, 
+	     unsigned int irq, unsigned int dma)
+{
+	struct net_device *dev;
+	struct nsc_fir_cb *self;
+	int dongle_id;
+	int ret;
+	int err;
+
+	IRDA_DEBUG(2, __FUNCTION__ "()\n");
+
+	if ((dongle_id = nsc_fir_probe(iobase, board_addr, irq, dma)) == -1)
+		return -1;
+
+	/*
+	 *  Allocate new instance of the driver
+	 */
+	self = kmalloc(sizeof(struct nsc_fir_cb), GFP_KERNEL);
+	if (self == NULL) {
+		ERROR(__FUNCTION__ "(), can't allocate memory for "
+		       "control block!\n");
+		return -ENOMEM;
+	}
+	memset(self, 0, sizeof(struct nsc_fir_cb));
+	spin_lock_init(&self->lock);
+   
+	/* Need to store self somewhere */
+	dev_self[i] = self;
+
+	/* Initialize IO */
+	self->io.iobase    = iobase;
+        self->io.irq       = irq;
+        self->io.io_ext    = CHIP_IO_EXTENT;
+        self->io.dma       = dma;
+        self->io.fifo_size = 32;
+
+	/* Lock the port that we need */
+	ret = check_region(self->io.iobase, self->io.io_ext);
+	if (ret < 0) { 
+		IRDA_DEBUG(0, __FUNCTION__ "(), can't get iobase of 0x%03x\n",
+		      self->io.iobase);
+		/* nsc_fir_cleanup(self->self);  */
+		return -ENODEV;
+	}
+	request_region(self->io.iobase, self->io.io_ext, driver_name);
+
+	/* Initialize QoS for this device */
+	irda_init_max_qos_capabilies(&self->qos);
+	
+	/* The only value we must override it the baudrate */
+	self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
+		IR_115200|IR_576000|IR_1152000 |(IR_4000000 << 8);
+	
+	self->qos.min_turn_time.bits = qos_mtt_bits;
+	irda_qos_bits_to_value(&self->qos);
+	
+	self->flags = IFF_FIR|IFF_MIR|IFF_SIR|IFF_DMA|IFF_PIO|IFF_DONGLE;
+
+	/* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
+	self->rx_buff.truesize = 14384; 
+	self->tx_buff.truesize = 14384;
+
+	/* Allocate memory if needed */
+	self->rx_buff.head = (__u8 *) kmalloc(self->rx_buff.truesize,
+					      GFP_KERNEL|GFP_DMA);
+	if (self->rx_buff.head == NULL)
+		return -ENOMEM;
+	memset(self->rx_buff.head, 0, self->rx_buff.truesize);
+	
+	self->tx_buff.head = (__u8 *) kmalloc(self->tx_buff.truesize, 
+					      GFP_KERNEL|GFP_DMA);
+	if (self->tx_buff.head == NULL) {
+		kfree(self->rx_buff.head);
+		return -ENOMEM;
+	}
+	memset(self->tx_buff.head, 0, self->tx_buff.truesize);
+
+	self->rx_buff.in_frame = FALSE;
+	self->rx_buff.state = OUTSIDE_FRAME;
+	self->tx_buff.data = self->tx_buff.head;
+	self->rx_buff.data = self->rx_buff.head;
+	
+	/* Reset Tx queue info */
+	self->tx_fifo.len = self->tx_fifo.ptr = self->tx_fifo.free = 0;
+	self->tx_fifo.tail = self->tx_buff.head;
+
+	if (!(dev = dev_alloc("irda%d", &err))) {
+		ERROR(__FUNCTION__ "(), dev_alloc() failed!\n");
+		return -ENOMEM;
+	}
+
+	dev->priv = (void *) self;
+	self->netdev = dev;
+
+	/* Override the network functions we need to use */
+	dev->init            = nsc_fir_net_init;
+	dev->hard_start_xmit = nsc_fir_hard_xmit_sir;
+	dev->open            = nsc_fir_net_open;
+	dev->stop            = nsc_fir_net_close;
+	dev->do_ioctl        = nsc_fir_net_ioctl;
+	dev->get_stats	     = nsc_fir_net_get_stats;
+
+	rtnl_lock();
+	err = register_netdevice(dev);
+	rtnl_unlock();
+	if (err) {
+		ERROR(__FUNCTION__ "(), register_netdev() failed!\n");
+		return -1;
+	}
+
+	MESSAGE("IrDA: Registered device %s\n", dev->name);
+	
+	self->io.dongle_id = dongle_id;
+	nsc_fir_init_dongle_interface(iobase, dongle_id);
+
+	return 0;
+}
+
+#ifdef MODULE
+/*
+ * Function nsc_fir_close (self)
+ *
+ *    Close driver instance
+ *
+ */
+static int nsc_fir_close(struct nsc_fir_cb *self)
+{
+	int iobase;
+
+	IRDA_DEBUG(4, __FUNCTION__ "()\n");
+
+	ASSERT(self != NULL, return -1;);
+
+        iobase = self->io.iobase;
+
+	/* Remove netdevice */
+	if (self->netdev) {
+		rtnl_lock();
+		unregister_netdevice(self->netdev);
+		rtnl_unlock();
+	}
+
+	/* Release the PORT that this driver is using */
+	IRDA_DEBUG(4, __FUNCTION__ "(), Releasing Region %03x\n", 
+		   self->io.iobase);
+	release_region(self->io.iobase, self->io.io_ext);
+
+	if (self->tx_buff.head)
+		kfree(self->tx_buff.head);
+	
+	if (self->rx_buff.head)
+		kfree(self->rx_buff.head);
+
+	kfree(self);
+
+	return 0;
+}
+#endif /* MODULE */
+
+/*
+ * Function nsc_fir_init_807 (iobase, board_addr, irq, dma)
+ *
+ *    Initialize the NSC '108 chip
+ *
+ */
+static void nsc_fir_init_807(int iobase, int board_addr, int irq, int dma)
+{
+	__u8 temp=0;
+
+	outb(2, board_addr);      /* Mode Control Register (MCTL) */
+	outb(0x00, board_addr+1); /* Disable device */
+	
+	/* Base Address and Interrupt Control Register (BAIC) */
+	outb(0, board_addr);
+	switch (iobase) {
+	case 0x3e8: outb(0x14, board_addr+1); break;
+	case 0x2e8: outb(0x15, board_addr+1); break;
+		case 0x3f8: outb(0x16, board_addr+1); break;
+	case 0x2f8: outb(0x17, board_addr+1); break;
+	default: ERROR(__FUNCTION__ "(), invalid base_address");
+	}
+	
+	/* Control Signal Routing Register (CSRT) */
+	switch (irq) {
+	case 3:  temp = 0x01; break;
+	case 4:  temp = 0x02; break;
+	case 5:  temp = 0x03; break;
+	case 7:  temp = 0x04; break;
+	case 9:  temp = 0x05; break;
+	case 11: temp = 0x06; break;
+	case 15: temp = 0x07; break;
+	default: ERROR(__FUNCTION__ "(), invalid irq");
+	}
+	outb(1, board_addr);
+	
+	switch (dma) {	
+	case 0: outb(0x08+temp, board_addr+1); break;
+	case 1: outb(0x10+temp, board_addr+1); break;
+	case 3: outb(0x18+temp, board_addr+1); break;
+	default: ERROR(__FUNCTION__ "(), invalid dma");
+	}
+	
+	outb(2, board_addr);      /* Mode Control Register (MCTL) */
+	outb(0x03, board_addr+1); /* Enable device */
+}
+
+/*
+ * Function nsc_fir_init_338 (iobase, board_addr, irq, dma)
+ *
+ *    Initialize the NSC '338 chip. Remember that the 87338 needs two 
+ *    consecutive writes to the data registers while CPU interrupts are
+ *    disabled. The 97338 does not require this, but shouldn't be any
+ *    harm if we do it anyway.
+ */
+static void nsc_fir_init_338(int iobase, int board_addr, int irq, int dma)
+{
+	/* No init yet */
+}
+
+static int nsc_fir_find_chip(int board_addr)
+{
+	__u8 index, id;
+
+	IRDA_DEBUG(4, __FUNCTION__ "()\n");
+
+	/* Read index register */
+	index = inb(board_addr);
+	if (index == 0xff) {
+		IRDA_DEBUG(0, __FUNCTION__ "(), no chip at 0x%03x\n", 
+			   board_addr);
+		return -1;
+	}
+
+	/* Read chip identification register (SID) for the PC97338 */
+	outb(8, board_addr);
+	id = inb(board_addr+1);
+	if ((id & 0xf0) == PC97338) {
+		MESSAGE("%s, Found NSC PC97338 chip, revision=%d\n", 
+			driver_name, id & 0x0f);
+		return PC97338;		
+	} 
+
+	/* Read device identification (DID) for the PC87108 */
+	outb(5, board_addr);
+	id = inb(board_addr+1);
+	if ((id & 0xf0) == PC87108) {
+		MESSAGE("%s, Found NSC PC87108 chip, revision=%d\n", 
+			driver_name, id & 0x0f);
+		return PC87108;
+	}
+
+	return -1;
+}
+
+/*
+ * Function nsc_fir_probe (iobase, board_addr, irq, dma)
+ *
+ *    Returns non-negative on success.
+ *
+ */
+static int nsc_fir_probe(int iobase, int board_addr, int irq, int dma)
+{
+	int version;
+	__u8 chip;
+
+	chip = nsc_fir_find_chip(board_addr);
+	switch (chip) {
+	case PC87108:
+		nsc_fir_init_807(iobase, board_addr, irq, dma);
+		break;
+	case PC97338:
+		nsc_fir_init_338(iobase, board_addr, irq, dma);
+		break;
+	default:
+		/* Found no chip */
+		return -1;
+	}
+
+	/* Read the Module ID */
+	switch_bank(iobase, BANK3);
+	version = inb(iobase+MID);
+
+	/* Should be 0x2? */
+	if (0x20 != (version & 0xf0)) {
+		ERROR("%s, Wrong chip version %02x\n", driver_name, version);
+		return -1;
+	}
+	MESSAGE("%s, Found chip at base=0x%04x\n", driver_name, board_addr);
+
+	/* Switch to advanced mode */
+	switch_bank(iobase, BANK2);
+	outb(ECR1_EXT_SL, iobase+ECR1);
+	switch_bank(iobase, BANK0);
+
+	/* Check if user has supplied the dongle id or not */
+	if (!dongle_id) {
+		dongle_id = nsc_fir_read_dongle_id(iobase);
+		
+		MESSAGE("%s, Found dongle: %s\n", driver_name,
+			dongle_types[dongle_id]);
+	} else {
+		MESSAGE("%s, Using dongle: %s\n", driver_name,
+			dongle_types[dongle_id]);
+	}
+	
+	/* Set FIFO threshold to TX17, RX16, reset and enable FIFO's */
+	switch_bank(iobase, BANK0);	
+	outb(FCR_RXTH|FCR_TXTH|FCR_TXSR|FCR_RXSR|FCR_FIFO_EN, iobase+FCR);
+	
+	/* Set FIFO size to 32 */
+	switch_bank(iobase, BANK2);
+	outb(EXCR2_RFSIZ|EXCR2_TFSIZ, iobase+EXCR2);
+
+	/* IRCR2: FEND_MD is set */
+	switch_bank(iobase, BANK5);
+ 	outb(0x2a, iobase+4);
+
+	/* Make sure that some defaults are OK */
+	switch_bank(iobase, BANK6);
+	outb(0x20, iobase+0); /* Set 32 bits FIR CRC */
+	outb(0x0a, iobase+1); /* Set MIR pulse width */
+	outb(0x0d, iobase+2); /* Set SIR pulse width */
+	outb(0x2a, iobase+4); /* Set beginning frag, and preamble length */
+
+	MESSAGE("%s, driver loaded (Dag Brattli)\n", driver_name);
+
+	/* Enable receive interrupts */
+	switch_bank(iobase, BANK0);
+	outb(IER_RXHDL_IE, iobase+IER);
+
+	return dongle_id;
+}
+
+/*
+ * Function nsc_fir_read_dongle_id (void)
+ *
+ * Try to read dongle indentification. This procedure needs to be executed
+ * once after power-on/reset. It also needs to be used whenever you suspect
+ * that the user may have plugged/unplugged the IrDA Dongle.
+ * 
+ */
+static int nsc_fir_read_dongle_id (int iobase)
+{
+	int dongle_id;
+	__u8 bank;
+
+	IRDA_DEBUG(4, __FUNCTION__ "()\n");
+
+	bank = inb(iobase+BSR);
+
+	/* Select Bank 7 */
+	switch_bank(iobase, BANK7);
+	
+	/* IRCFG4: IRSL0_DS and IRSL21_DS are cleared */
+	outb(0x00, iobase+7);
+	
+	/* ID0, 1, and 2 are pulled up/down very slowly */
+	udelay(50);
+	
+	/* IRCFG1: read the ID bits */
+	dongle_id = inb(iobase+4) & 0x0f;
+
+#ifdef BROKEN_DONGLE_ID
+	if (dongle_id == 0x0a)
+		dongle_id = 0x09;
+#endif
+	
+	/* Go back to  bank 0 before returning */
+	switch_bank(iobase, BANK0);
+
+	outb(bank, iobase+BSR);
+
+	return dongle_id;
+}
+
+/*
+ * Function nsc_fir_init_dongle_interface (iobase, dongle_id)
+ *
+ *     This function initializes the dongle for the transceiver that is
+ *     used. This procedure needs to be executed once after
+ *     power-on/reset. It also needs to be used whenever you suspect that
+ *     the dongle is changed. 
+ */
+static void nsc_fir_init_dongle_interface (int iobase, int dongle_id)
+{
+	int bank;
+
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+
+	/* Select Bank 7 */
+	switch_bank(iobase, BANK7);
+	
+	/* IRCFG4: set according to dongle_id */
+	switch (dongle_id) {
+	case 0x00: /* same as */
+	case 0x01: /* Differential serial interface */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x02: /* same as */
+	case 0x03: /* Reserved */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x04: /* Sharp RY5HD01 */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not supported yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x05: /* Reserved, but this is what the Thinkpad reports */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x06: /* Single-ended serial interface */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x07: /* Consumer-IR only */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s is not for IrDA mode\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x08: /* HP HSDL-2300, HP HSDL-3600/HSDL-3610 */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not supported yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x09: /* IBM31T1100 or Temic TFDS6000/TFDS6500 */
+		outb_p(0x28, iobase+7); /* Set irsl[0-2] as output */
+		break;
+	case 0x0A: /* same as */
+	case 0x0B: /* Reserved */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x0C: /* same as */
+	case 0x0D: /* HP HSDL-1100/HSDL-2100 */
+		/* 
+		 * Set irsl0 as input, irsl[1-2] as output, and separate 
+		 * inputs are used for SIR and MIR/FIR 
+		 */
+		outb(0x48, iobase+7); 
+		break;
+	case 0x0E: /* Supports SIR Mode only */
+		outb(0x28, iobase+7); /* Set irsl[0-2] as output */
+		break;
+	case 0x0F: /* No dongle connected */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s\n",
+			   dongle_types[dongle_id]); 
+
+		switch_bank(iobase, BANK0);
+		outb(0x62, iobase+MCR);
+		break;
+	default: 
+		IRDA_DEBUG(0, __FUNCTION__ "(), invalid dongle_id %#x", 
+			   dongle_id);
+	}
+	
+	/* IRCFG1: IRSL1 and 2 are set to IrDA mode */
+	outb(0x00, iobase+4);
+
+	/* Restore bank register */
+	outb(bank, iobase+BSR);
+	
+} /* set_up_dongle_interface */
+
+/*
+ * Function nsc_fir_change_dongle_speed (iobase, speed, dongle_id)
+ *
+ *    Change speed of the attach dongle
+ *
+ */
+static void nsc_fir_change_dongle_speed(int iobase, int speed, int dongle_id)
+{
+	unsigned long flags;
+	__u8 bank;
+
+	IRDA_DEBUG(4, __FUNCTION__ "()\n");
+
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+
+	/* Select Bank 7 */
+	switch_bank(iobase, BANK7);
+	
+	/* IRCFG1: set according to dongle_id */
+	switch (dongle_id) {
+	case 0x00: /* same as */
+	case 0x01: /* Differential serial interface */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x02: /* same as */
+	case 0x03: /* Reserved */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x04: /* Sharp RY5HD01 */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not supported yet\n",
+			   dongle_types[dongle_id]); 
+	case 0x05: /* Reserved */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x06: /* Single-ended serial interface */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x07: /* Consumer-IR only */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s is not for IrDA mode\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x08: /* HP HSDL-2300, HP HSDL-3600/HSDL-3610 */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not supported yet\n",
+			   dongle_types[dongle_id]); 
+	case 0x09: /* IBM31T1100 or Temic TFDS6000/TFDS6500 */
+		switch_bank(iobase, BANK7);
+		outb_p(0x01, iobase+4);
+
+		if (speed == 4000000) {
+			save_flags(flags);
+			cli();
+			outb(0x81, iobase+4);
+			outb(0x80, iobase+4);
+			restore_flags(flags);
+		} else
+			outb_p(0x00, iobase+4);
+		break;
+	case 0x0A: /* same as */
+	case 0x0B: /* Reserved */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s not defined by irda yet\n",
+			   dongle_types[dongle_id]); 
+		break;
+	case 0x0C: /* same as */
+	case 0x0D: /* HP HSDL-1100/HSDL-2100 */
+		break;
+	case 0x0E: /* Supports SIR Mode only */
+		break;
+	case 0x0F: /* No dongle connected */
+		IRDA_DEBUG(0, __FUNCTION__ "(), %s is not for IrDA mode\n",
+			   dongle_types[dongle_id]);
+
+		switch_bank(iobase, BANK0); 
+		outb(0x62, iobase+MCR);
+		break;
+	default: 
+		IRDA_DEBUG(0, __FUNCTION__ "(), invalid data_rate\n");
+	}
+	/* Restore bank register */
+	outb(bank, iobase+BSR);
+}
+
+/*
+ * Function nsc_fir_change_speed (self, baud)
+ *
+ *    Change the speed of the device
+ *
+ */
+static void nsc_fir_change_speed(struct nsc_fir_cb *self, __u32 speed)
+{
+	struct net_device *dev = self->netdev;
+	__u8 mcr = MCR_SIR;
+	int iobase; 
+	__u8 bank;
+
+	IRDA_DEBUG(2, __FUNCTION__ "(), speed=%d\n", speed);
+
+	ASSERT(self != NULL, return;);
+
+	iobase = self->io.iobase;
+
+	/* Update accounting for new speed */
+	self->io.speed = speed;
+
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+
+	/* Disable interrupts */
+	switch_bank(iobase, BANK0);
+	outb(0, iobase+IER);
+
+	/* Select Bank 2 */
+	switch_bank(iobase, BANK2);
+
+	outb(0x00, iobase+BGDH);
+	switch (speed) {
+	case 9600:   outb(0x0c, iobase+BGDL); break;
+	case 19200:  outb(0x06, iobase+BGDL); break;
+	case 38400:  outb(0x03, iobase+BGDL); break;
+	case 57600:  outb(0x02, iobase+BGDL); break;
+	case 115200: outb(0x01, iobase+BGDL); break;
+	case 576000:
+		switch_bank(iobase, BANK5);
+		
+		/* IRCR2: MDRS is set */
+		outb(inb(iobase+4) | 0x04, iobase+4);
+	       
+		mcr = MCR_MIR;
+		IRDA_DEBUG(0, __FUNCTION__ "(), handling baud of 576000\n");
+		break;
+	case 1152000:
+		mcr = MCR_MIR;
+		IRDA_DEBUG(0, __FUNCTION__ "(), handling baud of 1152000\n");
+		break;
+	case 4000000:
+		mcr = MCR_FIR;
+		IRDA_DEBUG(0, __FUNCTION__ "(), handling baud of 4000000\n");
+		break;
+	default:
+		mcr = MCR_FIR;
+		IRDA_DEBUG(0, __FUNCTION__ "(), unknown baud rate of %d\n", 
+			   speed);
+		break;
+	}
+
+	/* Set appropriate speed mode */
+	switch_bank(iobase, BANK0);
+	outb(mcr | MCR_TX_DFR, iobase+MCR);
+
+	/* Give some hits to the transceiver */
+	nsc_fir_change_dongle_speed(iobase, speed, self->io.dongle_id);
+
+	/* Set FIFO threshold to TX17, RX16 */
+	switch_bank(iobase, BANK0);
+	outb(0x00, iobase+FCR);
+	outb(FCR_FIFO_EN, iobase+FCR);
+	outb(FCR_RXTH|     /* Set Rx FIFO threshold */
+	     FCR_TXTH|     /* Set Tx FIFO threshold */
+	     FCR_TXSR|     /* Reset Tx FIFO */
+	     FCR_RXSR|     /* Reset Rx FIFO */
+	     FCR_FIFO_EN,  /* Enable FIFOs */
+	     iobase+FCR);
+	
+	/* Set FIFO size to 32 */
+	switch_bank(iobase, BANK2);
+	outb(EXCR2_RFSIZ|EXCR2_TFSIZ, iobase+EXCR2);
+	
+	self->netdev->tbusy = 0;
+	
+	/* Enable some interrupts so we can receive frames */
+	switch_bank(iobase, BANK0); 
+	if (speed > 115200) {
+		/* Install FIR xmit handler */
+		dev->hard_start_xmit = nsc_fir_hard_xmit_fir;
+		outb(IER_SFIF_IE, iobase+IER);
+		nsc_fir_dma_receive(self);
+	} else {
+		/* Install SIR xmit handler */
+		dev->hard_start_xmit = nsc_fir_hard_xmit_sir;
+		outb(IER_RXHDL_IE, iobase+IER);
+	}
+    	
+	/* Restore BSR */
+	outb(bank, iobase+BSR);
+}
+
+/*
+ * Function nsc_fir_hard_xmit (skb, dev)
+ *
+ *    Transmit the frame!
+ *
+ */
+static int nsc_fir_hard_xmit_sir(struct sk_buff *skb, struct net_device *dev)
+{
+	struct nsc_fir_cb *self;
+	unsigned long flags;
+	int iobase;
+	__u32 speed;
+	__u8 bank;
+	
+	self = (struct nsc_fir_cb *) dev->priv;
+
+	ASSERT(self != NULL, return 0;);
+
+	iobase = self->io.iobase;
+
+	/* Lock transmit buffer */
+	if (irda_lock((void *) &dev->tbusy) == FALSE)
+		return -EBUSY;
+	
+	/* Check if we need to change the speed */
+	if ((speed = irda_get_speed(skb)) != self->io.speed)
+		self->new_speed = speed;
+	
+	spin_lock_irqsave(&self->lock, flags);
+	
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+	
+	self->tx_buff.data = self->tx_buff.head;
+	
+	self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data, 
+					   self->tx_buff.truesize);
+	
+	/* Add interrupt on tx low level (will fire immediately) */
+	switch_bank(iobase, BANK0);
+	outb(IER_TXLDL_IE, iobase+IER);
+	
+	/* Restore bank register */
+	outb(bank, iobase+BSR);
+
+	spin_unlock_irqrestore(&self->lock, flags);
+
+	dev_kfree_skb(skb);
+
+	return 0;
+}
+
+static int nsc_fir_hard_xmit_fir(struct sk_buff *skb, struct net_device *dev)
+{
+	struct nsc_fir_cb *self;
+	unsigned long flags;
+	int iobase;
+	__u32 speed;
+	__u8 bank;
+	int mtt, diff;
+	
+	self = (struct nsc_fir_cb *) dev->priv;
+
+	ASSERT(self != NULL, return 0;);
+
+	iobase = self->io.iobase;
+
+	/* Lock transmit buffer */
+	if (irda_lock((void *) &dev->tbusy) == FALSE)
+		return -EBUSY;
+
+	/* Check if we need to change the speed */
+	if ((speed = irda_get_speed(skb)) != self->io.speed)
+		self->new_speed = speed;
+
+	spin_lock_irqsave(&self->lock, flags);
+
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+
+	/* Register and copy this frame to DMA memory */
+	self->tx_fifo.queue[self->tx_fifo.free].start = self->tx_fifo.tail;
+	self->tx_fifo.queue[self->tx_fifo.free].len = skb->len;
+	self->tx_fifo.tail += skb->len;
+
+	memcpy(self->tx_fifo.queue[self->tx_fifo.free].start, skb->data, 
+	       skb->len);
+	
+	self->tx_fifo.len++;
+	self->tx_fifo.free++;
+
+	/* Start transmit only if there is currently no transmit going on */
+	if (self->tx_fifo.len == 1) {
+		mtt = irda_get_mtt(skb);
+		if (mtt) {
+			/* Check how much time we have used already */
+			do_gettimeofday(&self->now);
+			diff = self->now.tv_usec - self->stamp.tv_usec;
+			if (diff < 0) 
+				diff += 1000000;
+			
+			/* Check if the mtt is larger than the time we have
+			 * already used by all the protocol processing
+			 */
+			if (mtt > diff) {
+				mtt -= diff;
+				if (mtt > 125) {
+					/* Adjust for timer resolution */
+					mtt = mtt / 125 + 1;
+					
+					/* Setup timer */
+					switch_bank(iobase, BANK4);
+					outb(mtt & 0xff, iobase+TMRL);
+					outb((mtt >> 8) & 0x0f, iobase+TMRH);
+					
+					/* Start timer */
+					outb(IRCR1_TMR_EN, iobase+IRCR1);
+					self->io.direction = IO_XMIT;
+					
+					/* Enable timer interrupt */
+					switch_bank(iobase, BANK0);
+					outb(IER_TMR_IE, iobase+IER);
+					
+					/* Timer will take care of the rest */
+					goto out; 
+				} else
+					udelay(mtt);
+			}
+		}
+		
+		/* Enable DMA interrupt */
+		switch_bank(iobase, BANK0);
+		outb(IER_DMA_IE, iobase+IER);
+		nsc_fir_dma_xmit(self, iobase);
+	}
+	/* Not busy transmitting anymore if window is not full */
+	if (self->tx_fifo.len < MAX_WINDOW)
+		dev->tbusy = 0;
+ out:
+	/* Restore bank register */
+	outb(bank, iobase+BSR);
+
+	spin_unlock_irqrestore(&self->lock, flags);
+
+	dev_kfree_skb(skb);
+
+	return 0;
+}
+
+/*
+ * Function nsc_fir_dma_xmit (self, iobase)
+ *
+ *    Transmit data using DMA
+ *
+ */
+static void nsc_fir_dma_xmit(struct nsc_fir_cb *self, int iobase)
+{
+	int bsr;
+
+	/* Save current bank */
+	bsr = inb(iobase+BSR);
+
+	/* Disable DMA */
+	switch_bank(iobase, BANK0);
+	outb(inb(iobase+MCR) & ~MCR_DMA_EN, iobase+MCR);
+	
+	self->io.direction = IO_XMIT;
+	
+	/* Choose transmit DMA channel  */ 
+	switch_bank(iobase, BANK2);
+	outb(ECR1_DMASWP|ECR1_DMANF|ECR1_EXT_SL, iobase+ECR1);
+	
+	setup_dma(self->io.dma, 
+		  self->tx_fifo.queue[self->tx_fifo.ptr].start, 
+		  self->tx_fifo.queue[self->tx_fifo.ptr].len, 
+		  DMA_TX_MODE);
+
+	/* Enable DMA and SIR interaction pulse */
+ 	switch_bank(iobase, BANK0);	
+	outb(inb(iobase+MCR)|MCR_TX_DFR|MCR_DMA_EN|MCR_IR_PLS, iobase+MCR);
+
+	/* Restore bank register */
+	outb(bsr, iobase+BSR);
+}
+
+/*
+ * Function nsc_fir_pio_xmit (self, iobase)
+ *
+ *    Transmit data using PIO. Returns the number of bytes that actually
+ *    got transfered
+ *
+ */
+static int nsc_fir_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
+{
+	int actual = 0;
+	__u8 bank;
+	
+	IRDA_DEBUG(4, __FUNCTION__ "()\n");
+
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+
+	switch_bank(iobase, BANK0);
+	if (!(inb_p(iobase+LSR) & LSR_TXEMP)) {
+		IRDA_DEBUG(4, __FUNCTION__ 
+			   "(), warning, FIFO not empty yet!\n");
+
+		fifo_size -= 17;
+	}
+
+	/* Fill FIFO with current frame */
+	while ((fifo_size-- > 0) && (actual < len)) {
+		/* Transmit next byte */
+		outb(buf[actual++], iobase+TXD);
+	}
+        
+	IRDA_DEBUG(4, __FUNCTION__ "(), fifo_size %d ; %d sent of %d\n", 
+		   fifo_size, actual, len);
+	
+	/* Restore bank */
+	outb(bank, iobase+BSR);
+
+	return actual;
+}
+
+/*
+ * Function nsc_fir_dma_xmit_complete (self)
+ *
+ *    The transfer of a frame in finished. This function will only be called 
+ *    by the interrupt handler
+ *
+ */
+static int nsc_fir_dma_xmit_complete(struct nsc_fir_cb *self)
+{
+	int iobase;
+	__u8 bank;
+	int ret = TRUE;
+
+	IRDA_DEBUG(2, __FUNCTION__ "()\n");
+
+	iobase = self->io.iobase;
+
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+
+	/* Disable DMA */
+	switch_bank(iobase, BANK0);
+        outb(inb(iobase+MCR) & ~MCR_DMA_EN, iobase+MCR);
+	
+	/* Check for underrrun! */
+	if (inb(iobase+ASCR) & ASCR_TXUR) {
+		self->stats.tx_errors++;
+		self->stats.tx_fifo_errors++;
+		
+		/* Clear bit, by writing 1 into it */
+		outb(ASCR_TXUR, iobase+ASCR);
+	} else {
+		self->stats.tx_packets++;
+		self->stats.tx_bytes += self->tx_buff.len;
+	}
+	
+	if (self->new_speed) {
+		nsc_fir_change_speed(self, self->new_speed);
+		self->new_speed = 0;
+	}
+
+	/* Finished with this frame, so prepare for next */
+	self->tx_fifo.ptr++;
+	self->tx_fifo.len--;
+
+	/* Any frames to be sent back-to-back? */
+	if (self->tx_fifo.len) {
+		nsc_fir_dma_xmit(self, iobase);
+		
+		/* Not finished yet! */
+		ret = FALSE;
+	}
+
+	/* Not busy transmitting anymore */
+	self->netdev->tbusy = 0;
+
+	/* Tell the network layer, that we can accept more frames */
+	mark_bh(NET_BH);
+
+	/* Restore bank */
+	outb(bank, iobase+BSR);
+	
+	return ret;
+}
+
+/*
+ * Function nsc_fir_dma_receive (self)
+ *
+ *    Get ready for receiving a frame. The device will initiate a DMA
+ *    if it starts to receive a frame.
+ *
+ */
+static int nsc_fir_dma_receive(struct nsc_fir_cb *self) 
+{
+	int iobase;
+	__u8 bsr;
+
+	ASSERT(self != NULL, return -1;);
+
+	iobase = self->io.iobase;
+
+	/* Reset Tx FIFO info */
+	self->tx_fifo.len = self->tx_fifo.ptr = self->tx_fifo.free = 0;
+	self->tx_fifo.tail = self->tx_buff.head;
+
+	/* Save current bank */
+	bsr = inb(iobase+BSR);
+
+	/* Disable DMA */
+	switch_bank(iobase, BANK0);
+	outb(inb(iobase+MCR) & ~MCR_DMA_EN, iobase+MCR);
+
+	/* Choose DMA Rx, DMA Fairness, and Advanced mode */
+	switch_bank(iobase, BANK2);
+	outb(ECR1_DMANF|ECR1_EXT_SL, iobase+ECR1);
+
+	self->io.direction = IO_RECV;
+	self->rx_buff.data = self->rx_buff.head;
+	
+	/* Reset Rx FIFO. This will also flush the ST_FIFO */
+	switch_bank(iobase, BANK0);
+	outb(FCR_RXSR|FCR_FIFO_EN, iobase+FCR);
+	self->st_fifo.len = self->st_fifo.tail = self->st_fifo.head = 0;
+	
+	setup_dma(self->io.dma, self->rx_buff.data, self->rx_buff.truesize, 
+		  DMA_RX_MODE);
+
+	/* Enable DMA */
+	switch_bank(iobase, BANK0);
+	outb(inb(iobase+MCR)|MCR_DMA_EN, iobase+MCR);
+
+	/* Restore bank register */
+	outb(bsr, iobase+BSR);
+	
+	return 0;
+}
+
+/*
+ * Function nsc_fir_dma_receive_complete (self)
+ *
+ *    Finished with receiving frames
+ *
+ *    
+ */
+static int nsc_fir_dma_receive_complete(struct nsc_fir_cb *self, int iobase)
+{
+	struct sk_buff *skb;
+	struct st_fifo *st_fifo;
+	__u8 bank;
+	__u8 status;
+	int len;
+
+	st_fifo = &self->st_fifo;
+
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+	
+	/* Read status FIFO */
+	switch_bank(iobase, BANK5);
+	while ((status = inb(iobase+FRM_ST)) & FRM_ST_VLD) {
+		st_fifo->entries[st_fifo->tail].status = status;
+
+		st_fifo->entries[st_fifo->tail].len  = inb(iobase+RFLFL);
+		st_fifo->entries[st_fifo->tail].len |= inb(iobase+RFLFH) << 8;
+		
+		st_fifo->tail++;
+		st_fifo->len++;
+	}
+	/* Try to process all entries in status FIFO */
+	while (st_fifo->len) {
+		/* Get first entry */
+		status = st_fifo->entries[st_fifo->head].status;
+		len    = st_fifo->entries[st_fifo->head].len;
+		st_fifo->head++;
+		st_fifo->len--;
+
+		/* Check for errors */
+		if (status & FRM_ST_ERR_MSK) {
+			if (status & FRM_ST_LOST_FR) {
+				/* Add number of lost frames to stats */
+				self->stats.rx_errors += len;	
+			} else {
+				/* Skip frame */
+				self->stats.rx_errors++;
+				
+				self->rx_buff.data += len;
+			
+				if (status & FRM_ST_MAX_LEN)
+					self->stats.rx_length_errors++;
+				
+				if (status & FRM_ST_PHY_ERR) 
+					self->stats.rx_frame_errors++;
+				
+				if (status & FRM_ST_BAD_CRC) 
+					self->stats.rx_crc_errors++;
+			}
+			/* The errors below can be reported in both cases */
+			if (status & FRM_ST_OVR1)
+				self->stats.rx_fifo_errors++;		       
+			
+			if (status & FRM_ST_OVR2)
+				self->stats.rx_fifo_errors++;
+		} else {
+			/* Check if we have transfered all data to memory */
+			switch_bank(iobase, BANK0);
+			if (inb(iobase+LSR) & LSR_RXDA) {
+				/* Put this entry back in fifo */
+				st_fifo->head--;
+				st_fifo->len++;
+				st_fifo->entries[st_fifo->head].status = status;
+				st_fifo->entries[st_fifo->head].len = len;
+				
+				/* Restore bank register */
+				outb(bank, iobase+BSR);
+				
+				return FALSE; 	/* I'll be back! */
+			}
+
+			/* 
+			 * Remember when we received this frame, so we can
+			 * reduce the min turn time a bit since we will know
+			 * how much time we have used for protocol processing
+			 */
+			do_gettimeofday(&self->stamp);
+
+			skb = dev_alloc_skb(len+1);
+			if (skb == NULL)  {
+				WARNING(__FUNCTION__ "(), memory squeeze, "
+					"dropping frame.\n");
+				
+				/* Restore bank register */
+				outb(bank, iobase+BSR);
+				
+				return FALSE;
+			}
+			
+			/* Make sure IP header gets aligned */
+			skb_reserve(skb, 1); 
+
+			/* Copy frame without CRC */
+			if (self->io.speed < 4000000) {
+				skb_put(skb, len-2);
+				memcpy(skb->data, self->rx_buff.data, len-2);
+			} else {
+				skb_put(skb, len-4);
+				memcpy(skb->data, self->rx_buff.data, len-4);
+			}
+
+			/* Move to next frame */
+			self->rx_buff.data += len;
+			self->stats.rx_packets++;
+
+			skb->dev = self->netdev;
+			skb->mac.raw  = skb->data;
+			skb->protocol = htons(ETH_P_IRDA);
+			netif_rx(skb);
+		}
+	}
+	/* Restore bank register */
+	outb(bank, iobase+BSR);
+
+	return TRUE;
+}
+
+/*
+ * Function nsc_fir_pio_receive (self)
+ *
+ *    Receive all data in receiver FIFO
+ *
+ */
+static void nsc_fir_pio_receive(struct nsc_fir_cb *self) 
+{
+	__u8 byte = 0x00;
+	int iobase;
+
+	IRDA_DEBUG(4, __FUNCTION__ "()\n");
+
+	ASSERT(self != NULL, return;);
+	
+	iobase = self->io.iobase;
+	
+	/*  Receive all characters in Rx FIFO */
+	do {
+		byte = inb(iobase+RXD);
+		async_unwrap_char(self->netdev, &self->stats, &self->rx_buff, 
+				  byte);
+	} while (inb(iobase+LSR) & LSR_RXDA); /* Data available */	
+}
+
+/*
+ * Function nsc_fir_sir_interrupt (self, eir)
+ *
+ *    Handle SIR interrupt
+ *
+ */
+static __u8 nsc_fir_sir_interrupt(struct nsc_fir_cb *self, int eir)
+{
+	int actual;
+	__u8 new_ier = 0;
+
+	/* Check if transmit FIFO is low on data */
+	if (eir & EIR_TXLDL_EV) {
+		/* Write data left in transmit buffer */
+		actual = nsc_fir_pio_write(self->io.iobase, 
+					   self->tx_buff.data, 
+					   self->tx_buff.len, 
+					   self->io.fifo_size);
+		self->tx_buff.data += actual;
+		self->tx_buff.len  -= actual;
+		
+		self->io.direction = IO_XMIT;
+
+		/* Check if finished */
+		if (self->tx_buff.len > 0)
+			new_ier |= IER_TXLDL_IE;
+		else { 
+			self->netdev->tbusy = 0; /* Unlock */
+			self->stats.tx_packets++;
+			
+		        mark_bh(NET_BH);	
+
+			new_ier |= IER_TXEMP_IE;
+		}
+			
+	}
+	/* Check if transmission has completed */
+	if (eir & EIR_TXEMP_EV) {
+		/* Check if we need to change the speed? */
+		if (self->new_speed) {
+			IRDA_DEBUG(2, __FUNCTION__ "(), Changing speed!\n");
+			nsc_fir_change_speed(self, self->new_speed);
+			self->new_speed = 0;
+		}
+
+		/* Turn around and get ready to receive some data */
+		self->io.direction = IO_RECV;
+		new_ier |= IER_RXHDL_IE;
+	}
+
+	/* Rx FIFO threshold or timeout */
+	if (eir & EIR_RXHDL_EV) {
+		nsc_fir_pio_receive(self);
+
+		/* Keep receiving */
+		new_ier |= IER_RXHDL_IE;
+	}
+	return new_ier;
+}
+
+/*
+ * Function nsc_fir_fir_interrupt (self, eir)
+ *
+ *    Handle MIR/FIR interrupt
+ *
+ */
+static __u8 nsc_fir_fir_interrupt(struct nsc_fir_cb *self, int iobase, int eir)
+{
+	__u8 new_ier = 0;
+	__u8 bank;
+
+	bank = inb(iobase+BSR);
+	
+	/* Status event, or end of frame detected in FIFO */
+	if (eir & (EIR_SFIF_EV|EIR_LS_EV)) {
+		if (nsc_fir_dma_receive_complete(self, iobase)) {
+
+			/* Wait for next status FIFO interrupt */
+			new_ier |= IER_SFIF_IE;
+		} else {
+			/* DMA not finished yet */
+
+			/* Set timer value, resolution 125 us */
+			switch_bank(iobase, BANK4);
+			outb(0x0f, iobase+TMRL); /* 125 us * 15 */
+			outb(0x00, iobase+TMRH);
+
+			/* Start timer */
+			outb(IRCR1_TMR_EN, iobase+IRCR1);
+
+			new_ier |= IER_TMR_IE;
+		}
+	} else if (eir & EIR_TMR_EV) { /* Timer finished */
+		/* Disable timer */
+		switch_bank(iobase, BANK4);
+		outb(0, iobase+IRCR1);
+
+		/* Clear timer event */
+		switch_bank(iobase, BANK0);
+		outb(ASCR_CTE, iobase+ASCR);
+
+		/* Check if this is a TX timer interrupt */
+		if (self->io.direction == IO_XMIT) {
+			nsc_fir_dma_xmit(self, iobase);
+
+			/*  Interrupt on DMA */
+			new_ier |= IER_DMA_IE;
+		} else {
+			/* Check if DMA has now finished */
+			nsc_fir_dma_receive_complete(self, iobase);
+
+			new_ier |= IER_SFIF_IE;
+		}
+	} else if (eir & EIR_DMA_EV) { /* Finished with transmission */
+		if (nsc_fir_dma_xmit_complete(self)) {		
+			/* Check if there are more frames to be transmitted */
+			if (irda_device_txqueue_empty(self->netdev)) {
+				/* Prepare for receive */
+				nsc_fir_dma_receive(self);
+			
+				new_ier = IER_LS_IE|IER_SFIF_IE;
+			}
+		} else {
+			/*  Not finished yet, so interrupt on DMA again */
+			new_ier |= IER_DMA_IE;
+		}
+	}
+	outb(bank, iobase+BSR);
+
+	return new_ier;
+}
+
+/*
+ * Function nsc_fir_interrupt (irq, dev_id, regs)
+ *
+ *    An interrupt from the chip has arrived. Time to do some work
+ *
+ */
+static void nsc_fir_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct nsc_fir_cb *self;
+	__u8 bsr, eir, ier;
+	int iobase;
+
+	if (!dev) {
+		printk(KERN_WARNING "%s: irq %d for unknown device.\n", 
+		       driver_name, irq);
+		return;
+	}
+	self = (struct nsc_fir_cb *) dev->priv;
+
+	spin_lock(&self->lock);	
+	dev->interrupt = 1;
+
+	iobase = self->io.iobase;
+
+	bsr = inb(iobase+BSR); 	/* Save current bank */
+
+	switch_bank(iobase, BANK0);	
+	ier = inb(iobase+IER); 
+	eir = inb(iobase+EIR) & ier; /* Mask out the interesting ones */ 
+
+	outb(0, iobase+IER); /* Disable interrupts */
+	
+	if (eir) {
+		/* Dispatch interrupt handler for the current speed */
+		if (self->io.speed > 115200)
+			ier = nsc_fir_fir_interrupt(self, iobase, eir);
+		else
+			ier = nsc_fir_sir_interrupt(self, eir);
+	}
+
+	outb(ier, iobase+IER);   /* Restore interrupts */
+	outb(bsr, iobase+BSR);   /* Restore bank register */
+
+	dev->interrupt = 0;
+	spin_unlock(&self->lock);
+}
+
+/*
+ * Function nsc_fir_is_receiving (self)
+ *
+ *    Return TRUE is we are currently receiving a frame
+ *
+ */
+static int nsc_fir_is_receiving(struct nsc_fir_cb *self)
+{
+	int status = FALSE;
+	int iobase;
+	__u8 bank;
+
+	ASSERT(self != NULL, return FALSE;);
+
+	if (self->io.speed > 115200) {
+		iobase = self->io.iobase;
+
+		/* Check if rx FIFO is not empty */
+		bank = inb(iobase+BSR);
+		switch_bank(iobase, BANK2);
+		if ((inb(iobase+RXFLV) & 0x3f) != 0) {
+			/* We are receiving something */
+			status =  TRUE;
+		}
+		outb(bank, iobase+BSR);
+	} else 
+		status = (self->rx_buff.state != OUTSIDE_FRAME);
+	
+	return status;
+}
+
+/*
+ * Function nsc_fir_net_init (dev)
+ *
+ *    Initialize network device
+ *
+ */
+static int nsc_fir_net_init(struct net_device *dev)
+{
+	IRDA_DEBUG(4, __FUNCTION__ "()\n");
+
+	/* Setup to be a normal IrDA network device driver */
+	irda_device_setup(dev);
+
+	/* Insert overrides below this line! */
+
+	return 0;
+}
+
+/*
+ * Function nsc_fir_net_open (dev)
+ *
+ *    Start the device
+ *
+ */
+static int nsc_fir_net_open(struct net_device *dev)
+{
+	struct nsc_fir_cb *self;
+	int iobase;
+	__u8 bank;
+	
+	IRDA_DEBUG(4, __FUNCTION__ "()\n");
+	
+	ASSERT(dev != NULL, return -1;);
+	self = (struct nsc_fir_cb *) dev->priv;
+	
+	ASSERT(self != NULL, return 0;);
+	
+	iobase = self->io.iobase;
+
+	if (request_irq(self->io.irq, nsc_fir_interrupt, 0, dev->name, 
+			(void *) dev)) 
+	{
+		return -EAGAIN;
+	}
+	/*
+	 * Always allocate the DMA channel after the IRQ, and clean up on 
+	 * failure.
+	 */
+	if (request_dma(self->io.dma, dev->name)) {
+		free_irq(self->io.irq, self);
+		return -EAGAIN;
+	}
+	
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+	
+	/* turn on interrupts */
+	switch_bank(iobase, BANK0);
+	outb(IER_LS_IE | IER_RXHDL_IE, iobase+IER);
+
+	/* Restore bank register */
+	outb(bank, iobase+BSR);
+
+	/* Ready to play! */
+	dev->tbusy = 0;
+	dev->interrupt = 0;
+	dev->start = 1;
+
+	/* 
+	 * Open new IrLAP layer instance, now that everything should be
+	 * initialized properly 
+	 */
+	self->irlap = irlap_open(dev, &self->qos);
+
+	MOD_INC_USE_COUNT;
+
+	return 0;
+}
+
+/*
+ * Function nsc_fir_net_close (dev)
+ *
+ *    Stop the device
+ *
+ */
+static int nsc_fir_net_close(struct net_device *dev)
+{
+	struct nsc_fir_cb *self;
+	int iobase;
+	__u8 bank;
+
+	IRDA_DEBUG(4, __FUNCTION__ "()\n");
+	
+	ASSERT(dev != NULL, return -1;);
+	self = (struct nsc_fir_cb *) dev->priv;
+	
+	ASSERT(self != NULL, return 0;);
+
+	/* Stop device */
+	dev->tbusy = 1;
+	dev->start = 0;
+
+	/* Stop and remove instance of IrLAP */
+	if (self->irlap)
+		irlap_close(self->irlap);
+	self->irlap = NULL;
+	
+	iobase = self->io.iobase;
+
+	disable_dma(self->io.dma);
+
+	/* Save current bank */
+	bank = inb(iobase+BSR);
+
+	/* Disable interrupts */
+	switch_bank(iobase, BANK0);
+	outb(0, iobase+IER); 
+       
+	free_irq(self->io.irq, dev);
+	free_dma(self->io.dma);
+
+	/* Restore bank register */
+	outb(bank, iobase+BSR);
+
+	MOD_DEC_USE_COUNT;
+
+	return 0;
+}
+
+/*
+ * Function nsc_fir_net_ioctl (dev, rq, cmd)
+ *
+ *    Process IOCTL commands for this device
+ *
+ */
+static int nsc_fir_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct if_irda_req *irq = (struct if_irda_req *) rq;
+	struct nsc_fir_cb *self;
+	unsigned long flags;
+	int ret = 0;
+
+	ASSERT(dev != NULL, return -1;);
+
+	self = dev->priv;
+
+	ASSERT(self != NULL, return -1;);
+
+	IRDA_DEBUG(2, __FUNCTION__ "(), %s, (cmd=0x%X)\n", dev->name, cmd);
+	
+	/* Disable interrupts & save flags */
+	save_flags(flags);
+	cli();
+	
+	switch (cmd) {
+	case SIOCSBANDWIDTH: /* Set bandwidth */
+		nsc_fir_change_speed(self, irq->ifr_baudrate);
+		break;
+	case SIOCSMEDIABUSY: /* Set media busy */
+		irda_device_set_media_busy(self->netdev, TRUE);
+		break;
+	case SIOCGRECEIVING: /* Check if we are receiving right now */
+		irq->ifr_receiving = nsc_fir_is_receiving(self);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+	}
+	
+	restore_flags(flags);
+	
+	return ret;
+}
+
+static struct net_device_stats *nsc_fir_net_get_stats(struct net_device *dev)
+{
+	struct nsc_fir_cb *self = (struct nsc_fir_cb *) dev->priv;
+	
+	return &self->stats;
+}
+
+#ifdef CONFIG_APM
+static void nsc_fir_suspend(struct nsc_fir_cb *self)
+{
+	int i = 10;
+
+	MESSAGE("%s, Suspending\n", driver_name);
+
+	if (self->suspend)
+		return;
+
+	self->suspend = 1;
+}
+
+
+static void nsc_fir_wakeup(struct nsc_fir_cb *self)
+{
+	struct net_device *dev = self->netdev;
+	unsigned long flags;
+
+	if (!self->suspend)
+		return;
+
+	save_flags(flags);
+	cli();
+
+	restore_flags(flags);
+	MESSAGE("%s, Waking up\n", driver_name);
+}
+
+static int nsc_fir_apmproc(apm_event_t event)
+{
+	static int down = 0;          /* Filter out double events */
+	int i;
+
+	switch (event) {
+	case APM_SYS_SUSPEND:
+	case APM_USER_SUSPEND:
+		if (!down) {			
+			for (i = 0; i < 4; i++) {
+				if (dev_self[i])
+					nsc_fir_suspend(dev_self[i]);
+			}
+		}
+		down = 1;
+		break;
+	case APM_NORMAL_RESUME:
+	case APM_CRITICAL_RESUME:
+		if (down) {
+			for (i = 0; i < 4; i++) {
+				if (dev_self[i])
+					nsc_fir_wakeup(dev_self[i]);
+			}
+		}
+		down = 0;
+		break;
+	}
+	return 0;
+}
+#endif /* CONFIG_APM */
+
+#ifdef MODULE
+MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
+MODULE_DESCRIPTION("NSC FIR IrDA Device Driver");
+
+MODULE_PARM(qos_mtt_bits, "i");
+MODULE_PARM(io, "1-4i");
+MODULE_PARM(io2, "1-4i");
+MODULE_PARM(irq, "1-4i");
+MODULE_PARM(dongle_id, "i");
+
+int init_module(void)
+{
+	return nsc_fir_init();
+}
+
+void cleanup_module(void)
+{
+	nsc_fir_cleanup();
+}
+#endif /* MODULE */
+

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