Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1379 insertions, 0 deletions

diff --git a/drivers/net/irda/w83977af_ir.c b/drivers/net/irda/w83977af_ir.c
new file mode 100644
index 000000000000..0ea65c4c6f85
--- /dev/null
+++ b/drivers/net/irda/w83977af_ir.c
@@ -0,0 +1,1379 @@
+/*********************************************************************
+ *                
+ * Filename:      w83977af_ir.c
+ * Version:       1.0
+ * Description:   FIR driver for the Winbond W83977AF Super I/O chip
+ * Status:        Experimental.
+ * Author:        Paul VanderSpek
+ * Created at:    Wed Nov  4 11:46:16 1998
+ * Modified at:   Fri Jan 28 12:10:59 2000
+ * Modified by:   Dag Brattli <dagb@cs.uit.no>
+ * 
+ *     Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>
+ *     Copyright (c) 1998-1999 Rebel.com
+ *      
+ *     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 Paul VanderSpek nor Rebel.com admit liability nor provide
+ *     warranty for any of this software. This material is provided "AS-IS"
+ *     and at no charge.
+ *     
+ *     If you find bugs in this file, its very likely that the same bug
+ *     will also be in pc87108.c since the implementations are quite
+ *     similar.
+ *
+ *     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);
+ *
+ ********************************************************************/
+
+#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/slab.h>
+#include <linux/init.h>
+#include <linux/rtnetlink.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/byteorder.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/irda_device.h>
+#include "w83977af.h"
+#include "w83977af_ir.h"
+
+#ifdef  CONFIG_ARCH_NETWINDER            /* Adjust to NetWinder differences */
+#undef  CONFIG_NETWINDER_TX_DMA_PROBLEMS /* Not needed */
+#define CONFIG_NETWINDER_RX_DMA_PROBLEMS /* Must have this one! */
+#endif
+#undef  CONFIG_USE_INTERNAL_TIMER  /* Just cannot make that timer work */
+#define CONFIG_USE_W977_PNP        /* Currently needed */
+#define PIO_MAX_SPEED       115200 
+
+static char *driver_name = "w83977af_ir";
+static int  qos_mtt_bits = 0x07;   /* 1 ms or more */
+
+#define CHIP_IO_EXTENT 8
+
+static unsigned int io[] = { 0x180, ~0, ~0, ~0 };
+#ifdef CONFIG_ARCH_NETWINDER             /* Adjust to NetWinder differences */
+static unsigned int irq[] = { 6, 0, 0, 0 };
+#else
+static unsigned int irq[] = { 11, 0, 0, 0 };
+#endif
+static unsigned int dma[] = { 1, 0, 0, 0 };
+static unsigned int efbase[] = { W977_EFIO_BASE, W977_EFIO2_BASE };
+static unsigned int efio = W977_EFIO_BASE;
+
+static struct w83977af_ir *dev_self[] = { NULL, NULL, NULL, NULL};
+
+/* Some prototypes */
+static int  w83977af_open(int i, unsigned int iobase, unsigned int irq, 
+                          unsigned int dma);
+static int  w83977af_close(struct w83977af_ir *self);
+static int  w83977af_probe(int iobase, int irq, int dma);
+static int  w83977af_dma_receive(struct w83977af_ir *self); 
+static int  w83977af_dma_receive_complete(struct w83977af_ir *self);
+static int  w83977af_hard_xmit(struct sk_buff *skb, struct net_device *dev);
+static int  w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size);
+static void w83977af_dma_write(struct w83977af_ir *self, int iobase);
+static void w83977af_change_speed(struct w83977af_ir *self, __u32 speed);
+static int  w83977af_is_receiving(struct w83977af_ir *self);
+
+static int  w83977af_net_open(struct net_device *dev);
+static int  w83977af_net_close(struct net_device *dev);
+static int  w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static struct net_device_stats *w83977af_net_get_stats(struct net_device *dev);
+
+/*
+ * Function w83977af_init ()
+ *
+ *    Initialize chip. Just try to find out how many chips we are dealing with
+ *    and where they are
+ */
+static int __init w83977af_init(void)
+{
+        int i;
+
+	IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
+
+	for (i=0; (io[i] < 2000) && (i < 4); i++) { 
+		if (w83977af_open(i, io[i], irq[i], dma[i]) == 0)
+			return 0;
+	}
+	return -ENODEV;
+}
+
+/*
+ * Function w83977af_cleanup ()
+ *
+ *    Close all configured chips
+ *
+ */
+static void __exit w83977af_cleanup(void)
+{
+	int i;
+
+        IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
+
+	for (i=0; i < 4; i++) {
+		if (dev_self[i])
+			w83977af_close(dev_self[i]);
+	}
+}
+
+/*
+ * Function w83977af_open (iobase, irq)
+ *
+ *    Open driver instance
+ *
+ */
+int w83977af_open(int i, unsigned int iobase, unsigned int irq, 
+		  unsigned int dma)
+{
+	struct net_device *dev;
+        struct w83977af_ir *self;
+	int err;
+
+	IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
+
+	/* Lock the port that we need */
+	if (!request_region(iobase, CHIP_IO_EXTENT, driver_name)) {
+		IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
+		      __FUNCTION__ , iobase);
+		return -ENODEV;
+	}
+
+	if (w83977af_probe(iobase, irq, dma) == -1) {
+		err = -1;
+		goto err_out;
+	}
+	/*
+	 *  Allocate new instance of the driver
+	 */
+	dev = alloc_irdadev(sizeof(struct w83977af_ir));
+	if (dev == NULL) {
+		printk( KERN_ERR "IrDA: Can't allocate memory for "
+			"IrDA control block!\n");
+		err = -ENOMEM;
+		goto err_out;
+	}
+
+	self = dev->priv;
+	spin_lock_init(&self->lock);
+   
+
+	/* Initialize IO */
+	self->io.fir_base   = iobase;
+        self->io.irq       = irq;
+        self->io.fir_ext   = CHIP_IO_EXTENT;
+        self->io.dma       = dma;
+        self->io.fifo_size = 32;
+
+	/* Initialize QoS for this device */
+	irda_init_max_qos_capabilies(&self->qos);
+	
+	/* The only value we must override it the baudrate */
+
+	/* FIXME: The HP HDLS-1100 does not support 1152000! */
+	self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
+		IR_115200|IR_576000|IR_1152000|(IR_4000000 << 8);
+
+	/* The HP HDLS-1100 needs 1 ms according to the specs */
+	self->qos.min_turn_time.bits = qos_mtt_bits;
+	irda_qos_bits_to_value(&self->qos);
+	
+	/* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
+	self->rx_buff.truesize = 14384; 
+	self->tx_buff.truesize = 4000;
+	
+	/* Allocate memory if needed */
+	self->rx_buff.head =
+		dma_alloc_coherent(NULL, self->rx_buff.truesize,
+				   &self->rx_buff_dma, GFP_KERNEL);
+	if (self->rx_buff.head == NULL) {
+		err = -ENOMEM;
+		goto err_out1;
+	}
+
+	memset(self->rx_buff.head, 0, self->rx_buff.truesize);
+	
+	self->tx_buff.head =
+		dma_alloc_coherent(NULL, self->tx_buff.truesize,
+				   &self->tx_buff_dma, GFP_KERNEL);
+	if (self->tx_buff.head == NULL) {
+		err = -ENOMEM;
+		goto err_out2;
+	}
+	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;
+	self->netdev = dev;
+
+	/* Keep track of module usage */
+	SET_MODULE_OWNER(dev);
+
+	/* Override the network functions we need to use */
+	dev->hard_start_xmit = w83977af_hard_xmit;
+	dev->open            = w83977af_net_open;
+	dev->stop            = w83977af_net_close;
+	dev->do_ioctl        = w83977af_net_ioctl;
+	dev->get_stats	     = w83977af_net_get_stats;
+
+	err = register_netdev(dev);
+	if (err) {
+		IRDA_ERROR("%s(), register_netdevice() failed!\n", __FUNCTION__);
+		goto err_out3;
+	}
+	IRDA_MESSAGE("IrDA: Registered device %s\n", dev->name);
+
+	/* Need to store self somewhere */
+	dev_self[i] = self;
+	
+	return 0;
+err_out3:
+	dma_free_coherent(NULL, self->tx_buff.truesize,
+			  self->tx_buff.head, self->tx_buff_dma);
+err_out2:	
+	dma_free_coherent(NULL, self->rx_buff.truesize,
+			  self->rx_buff.head, self->rx_buff_dma);
+err_out1:
+	free_netdev(dev);
+err_out:
+	release_region(iobase, CHIP_IO_EXTENT);
+	return err;
+}
+
+/*
+ * Function w83977af_close (self)
+ *
+ *    Close driver instance
+ *
+ */
+static int w83977af_close(struct w83977af_ir *self)
+{
+	int iobase;
+
+	IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
+
+        iobase = self->io.fir_base;
+
+#ifdef CONFIG_USE_W977_PNP
+	/* enter PnP configuration mode */
+	w977_efm_enter(efio);
+
+	w977_select_device(W977_DEVICE_IR, efio);
+
+	/* Deactivate device */
+	w977_write_reg(0x30, 0x00, efio);
+
+	w977_efm_exit(efio);
+#endif /* CONFIG_USE_W977_PNP */
+
+	/* Remove netdevice */
+	unregister_netdev(self->netdev);
+
+	/* Release the PORT that this driver is using */
+	IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n", 
+	      __FUNCTION__ , self->io.fir_base);
+	release_region(self->io.fir_base, self->io.fir_ext);
+
+	if (self->tx_buff.head)
+		dma_free_coherent(NULL, self->tx_buff.truesize,
+				  self->tx_buff.head, self->tx_buff_dma);
+	
+	if (self->rx_buff.head)
+		dma_free_coherent(NULL, self->rx_buff.truesize,
+				  self->rx_buff.head, self->rx_buff_dma);
+
+	free_netdev(self->netdev);
+
+	return 0;
+}
+
+int w83977af_probe( int iobase, int irq, int dma)
+{
+  	int version;
+	int i;
+  	
+ 	for (i=0; i < 2; i++) {
+ 		IRDA_DEBUG( 0, "%s()\n", __FUNCTION__ );
+#ifdef CONFIG_USE_W977_PNP
+ 		/* Enter PnP configuration mode */
+		w977_efm_enter(efbase[i]);
+  
+ 		w977_select_device(W977_DEVICE_IR, efbase[i]);
+  
+ 		/* Configure PnP port, IRQ, and DMA channel */
+ 		w977_write_reg(0x60, (iobase >> 8) & 0xff, efbase[i]);
+ 		w977_write_reg(0x61, (iobase) & 0xff, efbase[i]);
+  
+ 		w977_write_reg(0x70, irq, efbase[i]);
+#ifdef CONFIG_ARCH_NETWINDER
+		/* Netwinder uses 1 higher than Linux */
+ 		w977_write_reg(0x74, dma+1, efbase[i]);
+#else
+ 		w977_write_reg(0x74, dma, efbase[i]);   
+#endif /*CONFIG_ARCH_NETWINDER */
+ 		w977_write_reg(0x75, 0x04, efbase[i]);  /* Disable Tx DMA */
+  	
+ 		/* Set append hardware CRC, enable IR bank selection */	
+ 		w977_write_reg(0xf0, APEDCRC|ENBNKSEL, efbase[i]);
+  
+ 		/* Activate device */
+ 		w977_write_reg(0x30, 0x01, efbase[i]);
+  
+ 		w977_efm_exit(efbase[i]);
+#endif /* CONFIG_USE_W977_PNP */
+  		/* Disable Advanced mode */
+  		switch_bank(iobase, SET2);
+  		outb(iobase+2, 0x00);  
+ 
+ 		/* Turn on UART (global) interrupts */
+ 		switch_bank(iobase, SET0);
+  		outb(HCR_EN_IRQ, iobase+HCR);
+  	
+  		/* Switch to advanced mode */
+  		switch_bank(iobase, SET2);
+  		outb(inb(iobase+ADCR1) | ADCR1_ADV_SL, iobase+ADCR1);
+  
+  		/* Set default IR-mode */
+  		switch_bank(iobase, SET0);
+  		outb(HCR_SIR, iobase+HCR);
+  
+  		/* Read the Advanced IR ID */
+  		switch_bank(iobase, SET3);
+  		version = inb(iobase+AUID);
+  	
+  		/* Should be 0x1? */
+  		if (0x10 == (version & 0xf0)) {
+ 			efio = efbase[i];
+ 
+ 			/* Set FIFO size to 32 */
+ 			switch_bank(iobase, SET2);
+ 			outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);	
+ 	
+ 			/* Set FIFO threshold to TX17, RX16 */
+ 			switch_bank(iobase, SET0);	
+ 			outb(UFR_RXTL|UFR_TXTL|UFR_TXF_RST|UFR_RXF_RST|
+			     UFR_EN_FIFO,iobase+UFR);
+ 
+ 			/* Receiver frame length */
+ 			switch_bank(iobase, SET4);
+			outb(2048 & 0xff, iobase+6);
+			outb((2048 >> 8) & 0x1f, iobase+7);
+
+			/* 
+			 * Init HP HSDL-1100 transceiver. 
+			 * 
+			 * Set IRX_MSL since we have 2 * receive paths IRRX, 
+			 * and IRRXH. Clear IRSL0D since we want IRSL0 * to 
+			 * be a input pin used for IRRXH 
+			 *
+			 *   IRRX  pin 37 connected to receiver 
+			 *   IRTX  pin 38 connected to transmitter
+			 *   FIRRX pin 39 connected to receiver      (IRSL0) 
+			 *   CIRRX pin 40 connected to pin 37
+			 */
+			switch_bank(iobase, SET7);
+			outb(0x40, iobase+7);
+			
+			IRDA_MESSAGE("W83977AF (IR) driver loaded. "
+				     "Version: 0x%02x\n", version);
+			
+			return 0;
+		} else {
+			/* Try next extented function register address */
+			IRDA_DEBUG( 0, "%s(), Wrong chip version", __FUNCTION__ );
+		}
+  	}   	
+	return -1;
+}
+
+void w83977af_change_speed(struct w83977af_ir *self, __u32 speed)
+{
+	int ir_mode = HCR_SIR;
+	int iobase; 
+	__u8 set;
+
+	iobase = self->io.fir_base;
+
+	/* Update accounting for new speed */
+	self->io.speed = speed;
+
+	/* Save current bank */
+	set = inb(iobase+SSR);
+
+	/* Disable interrupts */
+	switch_bank(iobase, SET0);
+	outb(0, iobase+ICR);
+
+	/* Select Set 2 */
+	switch_bank(iobase, SET2);
+	outb(0x00, iobase+ABHL);
+
+	switch (speed) {
+	case 9600:   outb(0x0c, iobase+ABLL); break;
+	case 19200:  outb(0x06, iobase+ABLL); break;
+	case 38400:  outb(0x03, iobase+ABLL); break;
+	case 57600:  outb(0x02, iobase+ABLL); break;
+	case 115200: outb(0x01, iobase+ABLL); break;
+	case 576000:
+		ir_mode = HCR_MIR_576;
+		IRDA_DEBUG(0, "%s(), handling baud of 576000\n", __FUNCTION__ );
+		break;
+	case 1152000:
+		ir_mode = HCR_MIR_1152;
+		IRDA_DEBUG(0, "%s(), handling baud of 1152000\n", __FUNCTION__ );
+		break;
+	case 4000000:
+		ir_mode = HCR_FIR;
+		IRDA_DEBUG(0, "%s(), handling baud of 4000000\n", __FUNCTION__ );
+		break;
+	default:
+		ir_mode = HCR_FIR;
+		IRDA_DEBUG(0, "%s(), unknown baud rate of %d\n", __FUNCTION__ , speed);
+		break;
+	}
+
+	/* Set speed mode */
+	switch_bank(iobase, SET0);
+	outb(ir_mode, iobase+HCR);
+
+	/* set FIFO size to 32 */
+	switch_bank(iobase, SET2);
+	outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);	
+	
+	/* set FIFO threshold to TX17, RX16 */
+	switch_bank(iobase, SET0);
+	outb(0x00, iobase+UFR);        /* Reset */
+	outb(UFR_EN_FIFO, iobase+UFR); /* First we must enable FIFO */
+	outb(0xa7, iobase+UFR);
+
+	netif_wake_queue(self->netdev);
+		
+	/* Enable some interrupts so we can receive frames */
+	switch_bank(iobase, SET0);
+	if (speed > PIO_MAX_SPEED) {
+		outb(ICR_EFSFI, iobase+ICR);
+		w83977af_dma_receive(self);
+	} else
+		outb(ICR_ERBRI, iobase+ICR);
+    	
+	/* Restore SSR */
+	outb(set, iobase+SSR);
+}
+
+/*
+ * Function w83977af_hard_xmit (skb, dev)
+ *
+ *    Sets up a DMA transfer to send the current frame.
+ *
+ */
+int w83977af_hard_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct w83977af_ir *self;
+	__s32 speed;
+	int iobase;
+	__u8 set;
+	int mtt;
+	
+	self = (struct w83977af_ir *) dev->priv;
+
+	iobase = self->io.fir_base;
+
+	IRDA_DEBUG(4, "%s(%ld), skb->len=%d\n", __FUNCTION__ , jiffies, 
+		   (int) skb->len);
+	
+	/* Lock transmit buffer */
+	netif_stop_queue(dev);
+	
+	/* Check if we need to change the speed */
+	speed = irda_get_next_speed(skb);
+	if ((speed != self->io.speed) && (speed != -1)) {
+		/* Check for empty frame */
+		if (!skb->len) {
+			w83977af_change_speed(self, speed); 
+			dev->trans_start = jiffies;
+			dev_kfree_skb(skb);
+			return 0;
+		} else
+			self->new_speed = speed;
+	}
+
+	/* Save current set */
+	set = inb(iobase+SSR);
+	
+	/* Decide if we should use PIO or DMA transfer */
+	if (self->io.speed > PIO_MAX_SPEED) {
+		self->tx_buff.data = self->tx_buff.head;
+		memcpy(self->tx_buff.data, skb->data, skb->len);
+		self->tx_buff.len = skb->len;
+		
+		mtt = irda_get_mtt(skb);
+#ifdef CONFIG_USE_INTERNAL_TIMER
+	        if (mtt > 50) {
+			/* Adjust for timer resolution */
+			mtt /= 1000+1;
+
+			/* Setup timer */
+			switch_bank(iobase, SET4);
+			outb(mtt & 0xff, iobase+TMRL);
+			outb((mtt >> 8) & 0x0f, iobase+TMRH);
+			
+			/* Start timer */
+			outb(IR_MSL_EN_TMR, iobase+IR_MSL);
+			self->io.direction = IO_XMIT;
+			
+			/* Enable timer interrupt */
+			switch_bank(iobase, SET0);
+			outb(ICR_ETMRI, iobase+ICR);
+		} else {
+#endif
+			IRDA_DEBUG(4, "%s(%ld), mtt=%d\n", __FUNCTION__ , jiffies, mtt);
+			if (mtt)
+				udelay(mtt);
+
+			/* Enable DMA interrupt */
+			switch_bank(iobase, SET0);
+	 		outb(ICR_EDMAI, iobase+ICR);
+	     		w83977af_dma_write(self, iobase);
+#ifdef CONFIG_USE_INTERNAL_TIMER
+		}
+#endif
+	} else {
+		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, SET0);
+		outb(ICR_ETXTHI, iobase+ICR);
+	}
+	dev->trans_start = jiffies;
+	dev_kfree_skb(skb);
+
+	/* Restore set register */
+	outb(set, iobase+SSR);
+
+	return 0;
+}
+
+/*
+ * Function w83977af_dma_write (self, iobase)
+ *
+ *    Send frame using DMA
+ *
+ */
+static void w83977af_dma_write(struct w83977af_ir *self, int iobase)
+{
+	__u8 set;
+#ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
+	unsigned long flags;
+	__u8 hcr;
+#endif
+        IRDA_DEBUG(4, "%s(), len=%d\n", __FUNCTION__ , self->tx_buff.len);
+
+	/* Save current set */
+	set = inb(iobase+SSR);
+
+	/* Disable DMA */
+	switch_bank(iobase, SET0);
+	outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
+
+	/* Choose transmit DMA channel  */ 
+	switch_bank(iobase, SET2);
+	outb(ADCR1_D_CHSW|/*ADCR1_DMA_F|*/ADCR1_ADV_SL, iobase+ADCR1);
+#ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
+	spin_lock_irqsave(&self->lock, flags);
+
+	disable_dma(self->io.dma);
+	clear_dma_ff(self->io.dma);
+	set_dma_mode(self->io.dma, DMA_MODE_READ);
+	set_dma_addr(self->io.dma, self->tx_buff_dma);
+	set_dma_count(self->io.dma, self->tx_buff.len);
+#else
+	irda_setup_dma(self->io.dma, self->tx_buff_dma, self->tx_buff.len,
+		       DMA_MODE_WRITE);	
+#endif
+	self->io.direction = IO_XMIT;
+	
+	/* Enable DMA */
+ 	switch_bank(iobase, SET0);
+#ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
+	hcr = inb(iobase+HCR);
+	outb(hcr | HCR_EN_DMA, iobase+HCR);
+	enable_dma(self->io.dma);
+	spin_unlock_irqrestore(&self->lock, flags);
+#else	
+	outb(inb(iobase+HCR) | HCR_EN_DMA | HCR_TX_WT, iobase+HCR);
+#endif
+
+	/* Restore set register */
+	outb(set, iobase+SSR);
+}
+
+/*
+ * Function w83977af_pio_write (iobase, buf, len, fifo_size)
+ *
+ *    
+ *
+ */
+static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
+{
+	int actual = 0;
+	__u8 set;
+	
+	IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
+
+	/* Save current bank */
+	set = inb(iobase+SSR);
+
+	switch_bank(iobase, SET0);
+	if (!(inb_p(iobase+USR) & USR_TSRE)) {
+		IRDA_DEBUG(4,
+			   "%s(), warning, FIFO not empty yet!\n", __FUNCTION__  );
+
+		fifo_size -= 17;
+		IRDA_DEBUG(4, "%s(), %d bytes left in tx fifo\n", 
+			   __FUNCTION__ , fifo_size);
+	}
+
+	/* Fill FIFO with current frame */
+	while ((fifo_size-- > 0) && (actual < len)) {
+		/* Transmit next byte */
+		outb(buf[actual++], iobase+TBR);
+	}
+        
+	IRDA_DEBUG(4, "%s(), fifo_size %d ; %d sent of %d\n", 
+		   __FUNCTION__ , fifo_size, actual, len);
+
+	/* Restore bank */
+	outb(set, iobase+SSR);
+
+	return actual;
+}
+
+/*
+ * Function w83977af_dma_xmit_complete (self)
+ *
+ *    The transfer of a frame in finished. So do the necessary things
+ *
+ *    
+ */
+static void w83977af_dma_xmit_complete(struct w83977af_ir *self)
+{
+	int iobase;
+	__u8 set;
+
+	IRDA_DEBUG(4, "%s(%ld)\n", __FUNCTION__ , jiffies);
+
+	IRDA_ASSERT(self != NULL, return;);
+
+	iobase = self->io.fir_base;
+
+	/* Save current set */
+	set = inb(iobase+SSR);
+
+	/* Disable DMA */
+	switch_bank(iobase, SET0);
+	outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
+	
+	/* Check for underrrun! */
+	if (inb(iobase+AUDR) & AUDR_UNDR) {
+		IRDA_DEBUG(0, "%s(), Transmit underrun!\n", __FUNCTION__ );
+		
+		self->stats.tx_errors++;
+		self->stats.tx_fifo_errors++;
+
+		/* Clear bit, by writing 1 to it */
+		outb(AUDR_UNDR, iobase+AUDR);
+	} else
+		self->stats.tx_packets++;
+
+	
+	if (self->new_speed) {
+		w83977af_change_speed(self, self->new_speed);
+		self->new_speed = 0;
+	}
+
+	/* Unlock tx_buff and request another frame */
+	/* Tell the network layer, that we want more frames */
+	netif_wake_queue(self->netdev);
+	
+	/* Restore set */
+	outb(set, iobase+SSR);
+}
+
+/*
+ * Function w83977af_dma_receive (self)
+ *
+ *    Get ready for receiving a frame. The device will initiate a DMA
+ *    if it starts to receive a frame.
+ *
+ */
+int w83977af_dma_receive(struct w83977af_ir *self) 
+{
+	int iobase;
+	__u8 set;
+#ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
+	unsigned long flags;
+	__u8 hcr;
+#endif
+	IRDA_ASSERT(self != NULL, return -1;);
+
+	IRDA_DEBUG(4, "%s\n", __FUNCTION__ );
+
+	iobase= self->io.fir_base;
+
+	/* Save current set */
+	set = inb(iobase+SSR);
+
+	/* Disable DMA */
+	switch_bank(iobase, SET0);
+	outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
+
+	/* Choose DMA Rx, DMA Fairness, and Advanced mode */
+	switch_bank(iobase, SET2);
+	outb((inb(iobase+ADCR1) & ~ADCR1_D_CHSW)/*|ADCR1_DMA_F*/|ADCR1_ADV_SL,
+	     iobase+ADCR1);
+
+	self->io.direction = IO_RECV;
+	self->rx_buff.data = self->rx_buff.head;
+
+#ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
+	spin_lock_irqsave(&self->lock, flags);
+
+	disable_dma(self->io.dma);
+	clear_dma_ff(self->io.dma);
+	set_dma_mode(self->io.dma, DMA_MODE_READ);
+	set_dma_addr(self->io.dma, self->rx_buff_dma);
+	set_dma_count(self->io.dma, self->rx_buff.truesize);
+#else
+	irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
+		       DMA_MODE_READ);
+#endif
+	/* 
+	 * Reset Rx FIFO. This will also flush the ST_FIFO, it's very 
+	 * important that we don't reset the Tx FIFO since it might not
+	 * be finished transmitting yet
+	 */
+	switch_bank(iobase, SET0);
+	outb(UFR_RXTL|UFR_TXTL|UFR_RXF_RST|UFR_EN_FIFO, iobase+UFR);
+	self->st_fifo.len = self->st_fifo.tail = self->st_fifo.head = 0;
+	
+	/* Enable DMA */
+	switch_bank(iobase, SET0);
+#ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
+	hcr = inb(iobase+HCR);
+	outb(hcr | HCR_EN_DMA, iobase+HCR);
+	enable_dma(self->io.dma);
+	spin_unlock_irqrestore(&self->lock, flags);
+#else	
+	outb(inb(iobase+HCR) | HCR_EN_DMA, iobase+HCR);
+#endif
+	/* Restore set */
+	outb(set, iobase+SSR);
+
+	return 0;
+}
+
+/*
+ * Function w83977af_receive_complete (self)
+ *
+ *    Finished with receiving a frame
+ *
+ */
+int w83977af_dma_receive_complete(struct w83977af_ir *self)
+{
+	struct sk_buff *skb;
+	struct st_fifo *st_fifo;
+	int len;
+	int iobase;
+	__u8 set;
+	__u8 status;
+
+	IRDA_DEBUG(4, "%s\n", __FUNCTION__ );
+
+	st_fifo = &self->st_fifo;
+
+	iobase = self->io.fir_base;
+
+	/* Save current set */
+	set = inb(iobase+SSR);
+	
+	iobase = self->io.fir_base;
+
+	/* Read status FIFO */
+	switch_bank(iobase, SET5);
+	while ((status = inb(iobase+FS_FO)) & FS_FO_FSFDR) {
+		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++;
+	}
+	
+	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 & FS_FO_ERR_MSK) {
+			if (status & FS_FO_LST_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 & FS_FO_MX_LEX)
+					self->stats.rx_length_errors++;
+				
+				if (status & FS_FO_PHY_ERR) 
+					self->stats.rx_frame_errors++;
+				
+				if (status & FS_FO_CRC_ERR) 
+					self->stats.rx_crc_errors++;
+			}
+			/* The errors below can be reported in both cases */
+			if (status & FS_FO_RX_OV)
+				self->stats.rx_fifo_errors++;
+			
+			if (status & FS_FO_FSF_OV)
+				self->stats.rx_fifo_errors++;
+			
+		} else {
+			/* Check if we have transferred all data to memory */
+			switch_bank(iobase, SET0);
+			if (inb(iobase+USR) & USR_RDR) {
+#ifdef CONFIG_USE_INTERNAL_TIMER
+				/* 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 set register */
+				outb(set, iobase+SSR);
+			
+				return FALSE; 	/* I'll be back! */
+#else
+				udelay(80); /* Should be enough!? */
+#endif
+			}
+						
+			skb = dev_alloc_skb(len+1);
+			if (skb == NULL)  {
+				printk(KERN_INFO
+				       "%s(), memory squeeze, dropping frame.\n", __FUNCTION__);
+				/* Restore set register */
+				outb(set, iobase+SSR);
+
+				return FALSE;
+			}
+			
+			/*  Align to 20 bytes */
+			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);
+			self->netdev->last_rx = jiffies;
+		}
+	}
+	/* Restore set register */
+	outb(set, iobase+SSR);
+
+	return TRUE;
+}
+
+/*
+ * Function pc87108_pio_receive (self)
+ *
+ *    Receive all data in receiver FIFO
+ *
+ */
+static void w83977af_pio_receive(struct w83977af_ir *self) 
+{
+	__u8 byte = 0x00;
+	int iobase;
+
+	IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
+
+	IRDA_ASSERT(self != NULL, return;);
+	
+	iobase = self->io.fir_base;
+	
+	/*  Receive all characters in Rx FIFO */
+	do {
+		byte = inb(iobase+RBR);
+		async_unwrap_char(self->netdev, &self->stats, &self->rx_buff, 
+				  byte);
+	} while (inb(iobase+USR) & USR_RDR); /* Data available */	
+}
+
+/*
+ * Function w83977af_sir_interrupt (self, eir)
+ *
+ *    Handle SIR interrupt
+ *
+ */
+static __u8 w83977af_sir_interrupt(struct w83977af_ir *self, int isr)
+{
+	int actual;
+	__u8 new_icr = 0;
+	__u8 set;
+	int iobase;
+
+	IRDA_DEBUG(4, "%s(), isr=%#x\n", __FUNCTION__ , isr);
+	
+	iobase = self->io.fir_base;
+	/* Transmit FIFO low on data */
+	if (isr & ISR_TXTH_I) {
+		/* Write data left in transmit buffer */
+		actual = w83977af_pio_write(self->io.fir_base, 
+					    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_icr |= ICR_ETXTHI;
+		} else {
+			set = inb(iobase+SSR);
+			switch_bank(iobase, SET0);
+			outb(AUDR_SFEND, iobase+AUDR);
+			outb(set, iobase+SSR); 
+
+			self->stats.tx_packets++;
+
+			/* Feed me more packets */
+			netif_wake_queue(self->netdev);
+			new_icr |= ICR_ETBREI;
+		}
+	}
+	/* Check if transmission has completed */
+	if (isr & ISR_TXEMP_I) {		
+		/* Check if we need to change the speed? */
+		if (self->new_speed) {
+			IRDA_DEBUG(2,
+				   "%s(), Changing speed!\n", __FUNCTION__ );
+			w83977af_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_icr |= ICR_ERBRI;
+	}
+
+	/* Rx FIFO threshold or timeout */
+	if (isr & ISR_RXTH_I) {
+		w83977af_pio_receive(self);
+
+		/* Keep receiving */
+		new_icr |= ICR_ERBRI;
+	}
+	return new_icr;
+}
+
+/*
+ * Function pc87108_fir_interrupt (self, eir)
+ *
+ *    Handle MIR/FIR interrupt
+ *
+ */
+static __u8 w83977af_fir_interrupt(struct w83977af_ir *self, int isr)
+{
+	__u8 new_icr = 0;
+	__u8 set;
+	int iobase;
+
+	iobase = self->io.fir_base;
+	set = inb(iobase+SSR);
+	
+	/* End of frame detected in FIFO */
+	if (isr & (ISR_FEND_I|ISR_FSF_I)) {
+		if (w83977af_dma_receive_complete(self)) {
+			
+			/* Wait for next status FIFO interrupt */
+			new_icr |= ICR_EFSFI;
+		} else {
+			/* DMA not finished yet */
+
+			/* Set timer value, resolution 1 ms */
+			switch_bank(iobase, SET4);
+			outb(0x01, iobase+TMRL); /* 1 ms */
+			outb(0x00, iobase+TMRH);
+
+			/* Start timer */
+			outb(IR_MSL_EN_TMR, iobase+IR_MSL);
+
+			new_icr |= ICR_ETMRI;
+		}
+	}
+	/* Timer finished */
+	if (isr & ISR_TMR_I) {
+		/* Disable timer */
+		switch_bank(iobase, SET4);
+		outb(0, iobase+IR_MSL);
+
+		/* Clear timer event */
+		/* switch_bank(iobase, SET0); */
+/* 		outb(ASCR_CTE, iobase+ASCR); */
+
+		/* Check if this is a TX timer interrupt */
+		if (self->io.direction == IO_XMIT) {
+			w83977af_dma_write(self, iobase);
+
+			new_icr |= ICR_EDMAI;
+		} else {
+			/* Check if DMA has now finished */
+			w83977af_dma_receive_complete(self);
+
+			new_icr |= ICR_EFSFI;
+		}
+	}	
+	/* Finished with DMA */
+	if (isr & ISR_DMA_I) {
+		w83977af_dma_xmit_complete(self);
+
+		/* Check if there are more frames to be transmitted */
+		/* if (irda_device_txqueue_empty(self)) { */
+		
+		/* Prepare for receive 
+		 * 
+		 * ** Netwinder Tx DMA likes that we do this anyway **
+		 */
+		w83977af_dma_receive(self);
+		new_icr = ICR_EFSFI;
+	       /* } */
+	}
+	
+	/* Restore set */
+	outb(set, iobase+SSR);
+
+	return new_icr;
+}
+
+/*
+ * Function w83977af_interrupt (irq, dev_id, regs)
+ *
+ *    An interrupt from the chip has arrived. Time to do some work
+ *
+ */
+static irqreturn_t w83977af_interrupt(int irq, void *dev_id,
+					struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct w83977af_ir *self;
+	__u8 set, icr, isr;
+	int iobase;
+
+	if (!dev) {
+		printk(KERN_WARNING "%s: irq %d for unknown device.\n", 
+			driver_name, irq);
+		return IRQ_NONE;
+	}
+	self = (struct w83977af_ir *) dev->priv;
+
+	iobase = self->io.fir_base;
+
+	/* Save current bank */
+	set = inb(iobase+SSR);
+	switch_bank(iobase, SET0);
+	
+	icr = inb(iobase+ICR); 
+	isr = inb(iobase+ISR) & icr; /* Mask out the interesting ones */ 
+
+	outb(0, iobase+ICR); /* Disable interrupts */
+	
+	if (isr) {
+		/* Dispatch interrupt handler for the current speed */
+		if (self->io.speed > PIO_MAX_SPEED )
+			icr = w83977af_fir_interrupt(self, isr);
+		else
+			icr = w83977af_sir_interrupt(self, isr);
+	}
+
+	outb(icr, iobase+ICR);    /* Restore (new) interrupts */
+	outb(set, iobase+SSR);    /* Restore bank register */
+	return IRQ_RETVAL(isr);
+}
+
+/*
+ * Function w83977af_is_receiving (self)
+ *
+ *    Return TRUE is we are currently receiving a frame
+ *
+ */
+static int w83977af_is_receiving(struct w83977af_ir *self)
+{
+	int status = FALSE;
+	int iobase;
+	__u8 set;
+
+	IRDA_ASSERT(self != NULL, return FALSE;);
+
+	if (self->io.speed > 115200) {
+		iobase = self->io.fir_base;
+
+		/* Check if rx FIFO is not empty */
+		set = inb(iobase+SSR);
+		switch_bank(iobase, SET2);
+		if ((inb(iobase+RXFDTH) & 0x3f) != 0) {
+			/* We are receiving something */
+			status =  TRUE;
+		}
+		outb(set, iobase+SSR);
+	} else 
+		status = (self->rx_buff.state != OUTSIDE_FRAME);
+	
+	return status;
+}
+
+/*
+ * Function w83977af_net_open (dev)
+ *
+ *    Start the device
+ *
+ */
+static int w83977af_net_open(struct net_device *dev)
+{
+	struct w83977af_ir *self;
+	int iobase;
+	char hwname[32];
+	__u8 set;
+	
+	IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
+	
+	IRDA_ASSERT(dev != NULL, return -1;);
+	self = (struct w83977af_ir *) dev->priv;
+	
+	IRDA_ASSERT(self != NULL, return 0;);
+	
+	iobase = self->io.fir_base;
+
+	if (request_irq(self->io.irq, w83977af_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 set */
+	set = inb(iobase+SSR);
+
+ 	/* Enable some interrupts so we can receive frames again */
+ 	switch_bank(iobase, SET0);
+ 	if (self->io.speed > 115200) {
+ 		outb(ICR_EFSFI, iobase+ICR);
+ 		w83977af_dma_receive(self);
+ 	} else
+ 		outb(ICR_ERBRI, iobase+ICR);
+
+	/* Restore bank register */
+	outb(set, iobase+SSR);
+
+	/* Ready to play! */
+	netif_start_queue(dev);
+	
+	/* Give self a hardware name */
+	sprintf(hwname, "w83977af @ 0x%03x", self->io.fir_base);
+
+	/* 
+	 * Open new IrLAP layer instance, now that everything should be
+	 * initialized properly 
+	 */
+	self->irlap = irlap_open(dev, &self->qos, hwname);
+
+	return 0;
+}
+
+/*
+ * Function w83977af_net_close (dev)
+ *
+ *    Stop the device
+ *
+ */
+static int w83977af_net_close(struct net_device *dev)
+{
+	struct w83977af_ir *self;
+	int iobase;
+	__u8 set;
+
+	IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
+
+	IRDA_ASSERT(dev != NULL, return -1;);
+	
+	self = (struct w83977af_ir *) dev->priv;
+	
+	IRDA_ASSERT(self != NULL, return 0;);
+	
+	iobase = self->io.fir_base;
+
+	/* Stop device */
+	netif_stop_queue(dev);
+	
+	/* Stop and remove instance of IrLAP */
+	if (self->irlap)
+		irlap_close(self->irlap);
+	self->irlap = NULL;
+
+	disable_dma(self->io.dma);
+
+	/* Save current set */
+	set = inb(iobase+SSR);
+	
+	/* Disable interrupts */
+	switch_bank(iobase, SET0);
+	outb(0, iobase+ICR); 
+
+	free_irq(self->io.irq, dev);
+	free_dma(self->io.dma);
+
+	/* Restore bank register */
+	outb(set, iobase+SSR);
+
+	return 0;
+}
+
+/*
+ * Function w83977af_net_ioctl (dev, rq, cmd)
+ *
+ *    Process IOCTL commands for this device
+ *
+ */
+static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct if_irda_req *irq = (struct if_irda_req *) rq;
+	struct w83977af_ir *self;
+	unsigned long flags;
+	int ret = 0;
+
+	IRDA_ASSERT(dev != NULL, return -1;);
+
+	self = dev->priv;
+
+	IRDA_ASSERT(self != NULL, return -1;);
+
+	IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__ , dev->name, cmd);
+	
+	spin_lock_irqsave(&self->lock, flags);
+
+	switch (cmd) {
+	case SIOCSBANDWIDTH: /* Set bandwidth */
+		if (!capable(CAP_NET_ADMIN)) {
+			ret = -EPERM;
+			goto out;
+		}
+		w83977af_change_speed(self, irq->ifr_baudrate);
+		break;
+	case SIOCSMEDIABUSY: /* Set media busy */
+		if (!capable(CAP_NET_ADMIN)) {
+			ret = -EPERM;
+			goto out;
+		}
+		irda_device_set_media_busy(self->netdev, TRUE);
+		break;
+	case SIOCGRECEIVING: /* Check if we are receiving right now */
+		irq->ifr_receiving = w83977af_is_receiving(self);
+		break;
+	default:
+		ret = -EOPNOTSUPP;
+	}
+out:
+	spin_unlock_irqrestore(&self->lock, flags);
+	return ret;
+}
+
+static struct net_device_stats *w83977af_net_get_stats(struct net_device *dev)
+{
+	struct w83977af_ir *self = (struct w83977af_ir *) dev->priv;
+	
+	return &self->stats;
+}
+
+MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
+MODULE_DESCRIPTION("Winbond W83977AF IrDA Device Driver");
+MODULE_LICENSE("GPL");
+
+
+module_param(qos_mtt_bits, int, 0);
+MODULE_PARM_DESC(qos_mtt_bits, "Mimimum Turn Time");
+module_param_array(io, int, NULL, 0);
+MODULE_PARM_DESC(io, "Base I/O addresses");
+module_param_array(irq, int, NULL, 0);
+MODULE_PARM_DESC(irq, "IRQ lines");
+
+/*
+ * Function init_module (void)
+ *
+ *    
+ *
+ */
+module_init(w83977af_init);
+
+/*
+ * Function cleanup_module (void)
+ *
+ *    
+ *
+ */
+module_exit(w83977af_cleanup);