[irda] add driver for mips Alchemy Au1000 SIR/FIR

Submitted by Ralf Baechle <ralf@linux-mips.org>

drivers/net/irda/Kconfig

@@ -289,6 +289,10 @@ config TOSHIBA_FIR
 	  <file:Documentation/modules.txt>.
 	  The module will be called donauboe.
 
+config AU1000_FIR
+	tristate "Alchemy Au1000 SIR/FIR"
+	depends on MIPS_AU1000 && IRDA
+
 config SMC_IRCC_OLD
 	tristate "SMC IrCC (old driver) (EXPERIMENTAL)"
 	depends on EXPERIMENTAL && IRDA

drivers/net/irda/Makefile

@@ -28,6 +28,7 @@ obj-$(CONFIG_LITELINK_DONGLE)	+= litelink.o
 obj-$(CONFIG_OLD_BELKIN_DONGLE)	+= old_belkin.o
 obj-$(CONFIG_EP7211_IR)		+= ep7211_ir.o
 obj-$(CONFIG_MCP2120_DONGLE)	+= mcp2120.o
+obj-$(CONFIG_AU1000_FIR)	+= au1k_ir.o
 obj-$(CONFIG_ACT200L_DONGLE)	+= act200l.o
 obj-$(CONFIG_MA600_DONGLE)	+= ma600.o
 # New SIR drivers

drivers/net/irda/au1k_ir.c

+/*
+ *
+ * Alchemy Semi Au1000 IrDA driver
+ *
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ *         	ppopov@mvista.com or source@mvista.com
+ *
+ * ########################################################################
+ *
+ *  This program is free software; you can distribute it and/or modify it
+ *  under the terms of the GNU General Public License (Version 2) as
+ *  published by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * ########################################################################
+ *
+ * 
+ */
+
+#ifndef __mips__
+#error This driver only works with MIPS architectures!
+#endif
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/rtnetlink.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+
+#include <asm/irq.h>
+#include <asm/bitops.h>
+#include <asm/io.h>
+#include <asm/au1000.h>
+#include <asm/pb1000.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irmod.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/irda_device.h>
+#include "net/irda/au1000_ircc.h"
+
+static int au1k_irda_net_init(struct net_device *);
+static int au1k_irda_start(struct net_device *);
+static int au1k_irda_stop(struct net_device *dev);
+static int au1k_irda_hard_xmit(struct sk_buff *, struct net_device *);
+static int au1k_irda_rx(struct net_device *);
+static void au1k_irda_interrupt(int, void *, struct pt_regs *);
+static void au1k_tx_timeout(struct net_device *);
+static struct net_device_stats *au1k_irda_stats(struct net_device *);
+static int au1k_irda_ioctl(struct net_device *, struct ifreq *, int);
+static int au1k_irda_set_speed(struct net_device *dev, int speed);
+
+static void *dma_alloc(size_t, dma_addr_t *);
+static void dma_free(void *, size_t);
+
+static int qos_mtt_bits = 0x07;  /* 1 ms or more */
+static struct net_device *ir_devs[NUM_IR_IFF];
+static char version[] __devinitdata =
+    "au1k_ircc:1.0 ppopov@mvista.com\n";
+
+#define RUN_AT(x) (jiffies + (x))
+
+static spinlock_t ir_lock = SPIN_LOCK_UNLOCKED;
+
+/*
+ * IrDA peripheral bug. You have to read the register
+ * twice to get the right value.
+ */
+u32 read_ir_reg(u32 addr) 
+{ 
+	readl(addr);
+	return readl(addr);
+}
+
+
+/*
+ * Buffer allocation/deallocation routines. The buffer descriptor returned
+ * has the virtual and dma address of a buffer suitable for 
+ * both, receive and transmit operations.
+ */
+static db_dest_t *GetFreeDB(struct au1k_private *aup)
+{
+	db_dest_t *pDB;
+	pDB = aup->pDBfree;
+
+	if (pDB) {
+		aup->pDBfree = pDB->pnext;
+	}
+	return pDB;
+}
+
+static void ReleaseDB(struct au1k_private *aup, db_dest_t *pDB)
+{
+	db_dest_t *pDBfree = aup->pDBfree;
+	if (pDBfree)
+		pDBfree->pnext = pDB;
+	aup->pDBfree = pDB;
+}
+
+
+/*
+  DMA memory allocation, derived from pci_alloc_consistent.
+  However, the Au1000 data cache is coherent (when programmed
+  so), therefore we return KSEG0 address, not KSEG1.
+*/
+static void *dma_alloc(size_t size, dma_addr_t * dma_handle)
+{
+	void *ret;
+	int gfp = GFP_ATOMIC | GFP_DMA;
+
+	ret = (void *) __get_free_pages(gfp, get_order(size));
+
+	if (ret != NULL) {
+		memset(ret, 0, size);
+		*dma_handle = virt_to_bus(ret);
+		ret = KSEG0ADDR(ret);
+	}
+	return ret;
+}
+
+
+static void dma_free(void *vaddr, size_t size)
+{
+	vaddr = KSEG0ADDR(vaddr);
+	free_pages((unsigned long) vaddr, get_order(size));
+}
+
+
+static void 
+setup_hw_rings(struct au1k_private *aup, u32 rx_base, u32 tx_base)
+{
+	int i;
+	for (i=0; i<NUM_IR_DESC; i++) {
+		aup->rx_ring[i] = (volatile ring_dest_t *) 
+			(rx_base + sizeof(ring_dest_t)*i);
+	}
+	for (i=0; i<NUM_IR_DESC; i++) {
+		aup->tx_ring[i] = (volatile ring_dest_t *) 
+			(tx_base + sizeof(ring_dest_t)*i);
+	}
+}
+
+
+/* 
+ * Device has already been stopped at this point.
+ */
+static void au1k_irda_net_uninit(struct net_device *dev)
+{
+	dev->hard_start_xmit = NULL;
+	dev->open            = NULL;
+	dev->stop            = NULL;
+	dev->do_ioctl        = NULL;
+	dev->get_stats       = NULL;
+	dev->priv            = NULL;
+}
+
+
+static int au1k_irda_init(void)
+{
+	static unsigned version_printed = 0;
+	struct net_device *dev;
+	int err;
+
+	if (version_printed++ == 0) printk(version);
+
+	rtnl_lock();
+	dev = dev_alloc("irda%d", &err);
+	if (dev) {
+		dev->irq = AU1000_IRDA_RX_INT; /* TX has its own interrupt */
+		dev->init = au1k_irda_net_init;
+		dev->uninit = au1k_irda_net_uninit;
+		err = register_netdevice(dev);
+
+		if (err)
+			kfree(dev);
+		else
+			ir_devs[0] = dev;
+		printk(KERN_INFO "IrDA: Registered device %s\n", dev->name);
+	}
+	rtnl_unlock();
+	return err;
+}
+
+static int au1k_irda_init_iobuf(iobuff_t *io, int size)
+{
+	io->head = kmalloc(size, GFP_KERNEL);
+	if (io->head != NULL) {
+		io->truesize = size;
+		io->in_frame = FALSE;
+		io->state    = OUTSIDE_FRAME;
+		io->data     = io->head;
+	}
+	return io->head ? 0 : -ENOMEM;
+}
+
+static int au1k_irda_net_init(struct net_device *dev)
+{
+	struct au1k_private *aup = NULL;
+	int i, retval = 0, err;
+	db_dest_t *pDB, *pDBfree;
+	unsigned long temp;
+
+	dev->priv = kmalloc(sizeof(struct au1k_private), GFP_KERNEL);
+	if (dev->priv == NULL) {
+		retval = -ENOMEM;
+		goto out;
+	}
+	memset(dev->priv, 0, sizeof(struct au1k_private));
+	aup = dev->priv;
+
+	err = au1k_irda_init_iobuf(&aup->rx_buff, 14384);
+	if (err)
+		goto out;
+
+	dev->open = au1k_irda_start;
+	dev->hard_start_xmit = au1k_irda_hard_xmit;
+	dev->stop = au1k_irda_stop;
+	dev->get_stats = au1k_irda_stats;
+	dev->do_ioctl = au1k_irda_ioctl;
+	dev->tx_timeout = au1k_tx_timeout;
+
+	irda_device_setup(dev);
+	irda_init_max_qos_capabilies(&aup->qos);
+
+	/* The only value we must override it the baudrate */
+	aup->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
+		IR_115200|IR_576000 |(IR_4000000 << 8);
+	
+	aup->qos.min_turn_time.bits = qos_mtt_bits;
+	irda_qos_bits_to_value(&aup->qos);
+
+
+	/* Tx ring follows rx ring + 512 bytes */
+	/* we need a 1k aligned buffer */
+	aup->rx_ring[0] = (ring_dest_t *)
+		dma_alloc(2*MAX_NUM_IR_DESC*(sizeof(ring_dest_t)), &temp);
+
+	/* allocate the data buffers */
+	aup->db[0].vaddr = 
+		(void *)dma_alloc(MAX_BUF_SIZE * 2*NUM_IR_DESC, &temp);
+	if (!aup->db[0].vaddr || !aup->rx_ring[0]) {
+		retval = -ENOMEM;
+		goto out;
+	}
+
+	setup_hw_rings(aup, (u32)aup->rx_ring[0], (u32)aup->rx_ring[0] + 512);
+
+	pDBfree = NULL;
+	pDB = aup->db;
+	for (i=0; i<(2*NUM_IR_DESC); i++) {
+		pDB->pnext = pDBfree;
+		pDBfree = pDB;
+		pDB->vaddr = 
+			(u32 *)((unsigned)aup->db[0].vaddr + MAX_BUF_SIZE*i);
+		pDB->dma_addr = (dma_addr_t)virt_to_bus(pDB->vaddr);
+		pDB++;
+	}
+	aup->pDBfree = pDBfree;
+
+	/* attach a data buffer to each descriptor */
+	for (i=0; i<NUM_IR_DESC; i++) {
+		pDB = GetFreeDB(aup);
+		if (!pDB) goto out;
+		aup->rx_ring[i]->addr_0 = (u8)(pDB->dma_addr & 0xff);
+		aup->rx_ring[i]->addr_1 = (u8)((pDB->dma_addr>>8) & 0xff);
+		aup->rx_ring[i]->addr_2 = (u8)((pDB->dma_addr>>16) & 0xff);
+		aup->rx_ring[i]->addr_3 = (u8)((pDB->dma_addr>>24) & 0xff);
+		aup->rx_db_inuse[i] = pDB;
+	}
+	for (i=0; i<NUM_IR_DESC; i++) {
+		pDB = GetFreeDB(aup);
+		if (!pDB) goto out;
+		aup->tx_ring[i]->addr_0 = (u8)(pDB->dma_addr & 0xff);
+		aup->tx_ring[i]->addr_1 = (u8)((pDB->dma_addr>>8) & 0xff);
+		aup->tx_ring[i]->addr_2 = (u8)((pDB->dma_addr>>16) & 0xff);
+		aup->tx_ring[i]->addr_3 = (u8)((pDB->dma_addr>>24) & 0xff);
+		aup->tx_ring[i]->count_0 = 0;
+		aup->tx_ring[i]->count_1 = 0;
+		aup->tx_ring[i]->flags = 0;
+		aup->tx_db_inuse[i] = pDB;
+	}
+	return 0;
+
+out:
+	if (aup->db[0].vaddr) 
+		dma_free((void *)aup->db[0].vaddr, 
+				MAX_BUF_SIZE * 2*NUM_IR_DESC);
+	if (aup->rx_ring[0])
+		kfree((void *)aup->rx_ring[0]);
+	if (aup->rx_buff.head)
+		kfree(aup->rx_buff.head);
+	if (dev->priv != NULL)
+		kfree(dev->priv);
+	unregister_netdevice(dev);
+	printk(KERN_ERR "%s: au1k_init_module failed.  Returns %d\n",
+	       dev->name, retval);
+	return retval;
+}
+
+
+static int au1k_init(struct net_device *dev)
+{
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+	int i;
+	u32 control;
+	u32 ring_address;
+
+	/* bring the device out of reset */
+	control = 0xe; /* coherent, clock enable, one half system clock */
+			  
+#ifndef CONFIG_CPU_LITTLE_ENDIAN
+	control |= 1;
+#endif
+	aup->tx_head = 0;
+	aup->tx_tail = 0;
+	aup->rx_head = 0;
+
+	for (i=0; i<NUM_IR_DESC; i++) {
+		aup->rx_ring[i]->flags = AU_OWN;
+	}
+
+	writel(control, IR_INTERFACE_CONFIG);
+	au_sync_delay(10);
+
+	writel(read_ir_reg(IR_ENABLE) & ~0x8000, IR_ENABLE); /* disable PHY */
+	au_sync_delay(1);
+
+	writel(MAX_BUF_SIZE, IR_MAX_PKT_LEN);
+
+	ring_address = (u32)virt_to_phys((void *)aup->rx_ring[0]);
+	writel(ring_address >> 26, IR_RING_BASE_ADDR_H);
+	writel((ring_address >> 10) & 0xffff, IR_RING_BASE_ADDR_L);
+
+	writel(RING_SIZE_64<<8 | RING_SIZE_64<<12, IR_RING_SIZE);
+
+	writel(1<<2 | IR_ONE_PIN, IR_CONFIG_2); /* 48MHz */
+	writel(0, IR_RING_ADDR_CMPR);
+
+	au1k_irda_set_speed(dev, 9600);
+	return 0;
+}
+
+static int au1k_irda_start(struct net_device *dev)
+{
+	int retval;
+	char hwname[32];
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+
+	MOD_INC_USE_COUNT;
+
+	if ((retval = au1k_init(dev))) {
+		printk(KERN_ERR "%s: error in au1k_init\n", dev->name);
+		MOD_DEC_USE_COUNT;
+		return retval;
+	}
+
+	if ((retval = request_irq(AU1000_IRDA_TX_INT, &au1k_irda_interrupt, 
+					0, dev->name, dev))) {
+		printk(KERN_ERR "%s: unable to get IRQ %d\n", 
+				dev->name, dev->irq);
+		MOD_DEC_USE_COUNT;
+		return retval;
+	}
+	if ((retval = request_irq(AU1000_IRDA_RX_INT, &au1k_irda_interrupt, 
+					0, dev->name, dev))) {
+		free_irq(AU1000_IRDA_TX_INT, dev);
+		printk(KERN_ERR "%s: unable to get IRQ %d\n", 
+				dev->name, dev->irq);
+		MOD_DEC_USE_COUNT;
+		return retval;
+	}
+
+	/* Give self a hardware name */
+	sprintf(hwname, "Au1000 SIR/FIR");
+	aup->irlap = irlap_open(dev, &aup->qos, hwname);
+	netif_start_queue(dev);
+
+	writel(read_ir_reg(IR_CONFIG_2) | 1<<8, IR_CONFIG_2); /* int enable */
+
+	aup->timer.expires = RUN_AT((3*HZ)); 
+	aup->timer.data = (unsigned long)dev;
+	return 0;
+}
+
+static int au1k_irda_stop(struct net_device *dev)
+{
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+
+	/* disable interrupts */
+	writel(read_ir_reg(IR_CONFIG_2) & ~(1<<8), IR_CONFIG_2);
+	writel(0, IR_CONFIG_1); 
+	writel(0, IR_INTERFACE_CONFIG); /* disable clock */
+	au_sync();
+
+	if (aup->irlap) {
+		irlap_close(aup->irlap);
+		aup->irlap = NULL;
+	}
+
+	netif_stop_queue(dev);
+	del_timer(&aup->timer);
+
+	/* disable the interrupt */
+	free_irq(AU1000_IRDA_TX_INT, dev);
+	free_irq(AU1000_IRDA_RX_INT, dev);
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+static void __exit au1k_irda_exit(void)
+{
+	struct net_device *dev = ir_devs[0];
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+
+	if (!dev) {
+		printk(KERN_ERR "au1k_ircc no dev found\n");
+		return;
+	}
+	if (aup->db[0].vaddr)  {
+		dma_free((void *)aup->db[0].vaddr, 
+				MAX_BUF_SIZE * 2*NUM_IR_DESC);
+		aup->db[0].vaddr = 0;
+	}
+	if (aup->rx_ring[0]) {
+		dma_free((void *)aup->rx_ring[0], 
+				2*MAX_NUM_IR_DESC*(sizeof(ring_dest_t)));
+		aup->rx_ring[0] = 0;
+	}
+	rtnl_lock();
+	unregister_netdevice(dev);
+	rtnl_unlock();
+	ir_devs[0] = 0;
+}
+
+
+static inline void 
+update_tx_stats(struct net_device *dev, u32 status, u32 pkt_len)
+{
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+	struct net_device_stats *ps = &aup->stats;
+
+	ps->tx_packets++;
+	ps->tx_bytes += pkt_len;
+
+	if (status & IR_TX_ERROR) {
+		ps->tx_errors++;
+		ps->tx_aborted_errors++;
+	}
+}
+
+
+static void au1k_tx_ack(struct net_device *dev)
+{
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+	volatile ring_dest_t *ptxd;
+
+	ptxd = aup->tx_ring[aup->tx_tail];
+	while (!(ptxd->flags & AU_OWN) && (aup->tx_tail != aup->tx_head)) {
+		update_tx_stats(dev, ptxd->flags, 
+				ptxd->count_1<<8 | ptxd->count_0);
+		ptxd->count_0 = 0;
+		ptxd->count_1 = 0;
+		au_sync();
+
+		aup->tx_tail = (aup->tx_tail + 1) & (NUM_IR_DESC - 1);
+		ptxd = aup->tx_ring[aup->tx_tail];
+
+		if (aup->tx_full) {
+			aup->tx_full = 0;
+			netif_wake_queue(dev);
+		}
+	}
+
+	if (aup->tx_tail == aup->tx_head) {
+		if (aup->newspeed) {
+			au1k_irda_set_speed(dev, aup->newspeed);
+			aup->newspeed = 0;
+		}
+		else {
+			writel(read_ir_reg(IR_CONFIG_1) & ~IR_TX_ENABLE, 
+					IR_CONFIG_1); 
+			au_sync();
+			writel(read_ir_reg(IR_CONFIG_1) | IR_RX_ENABLE, 
+					IR_CONFIG_1); 
+			writel(0, IR_RING_PROMPT);
+			au_sync();
+		}
+	}
+}
+
+
+/*
+ * Au1000 transmit routine.
+ */
+static int au1k_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+	int speed = irda_get_next_speed(skb);
+	volatile ring_dest_t *ptxd;
+	u32 len;
+
+	u32 flags;
+	db_dest_t *pDB;
+
+	if (speed != aup->speed && speed != -1) {
+		aup->newspeed = speed;
+	}
+
+	if ((skb->len == 0) && (aup->newspeed)) {
+		if (aup->tx_tail == aup->tx_head) {
+			au1k_irda_set_speed(dev, speed);
+			aup->newspeed = 0;
+		}
+		dev_kfree_skb(skb);
+		return 0;
+	}
+
+	ptxd = aup->tx_ring[aup->tx_head];
+	flags = ptxd->flags;
+
+	if (flags & AU_OWN) {
+		printk(KERN_INFO "%s: tx_full\n", dev->name);
+		netif_stop_queue(dev);
+		aup->tx_full = 1;
+		return 1;
+	}
+	else if (((aup->tx_head + 1) & (NUM_IR_DESC - 1)) == aup->tx_tail) {
+		printk(KERN_INFO "%s: tx_full\n", dev->name);
+		netif_stop_queue(dev);
+		aup->tx_full = 1;
+		return 1;
+	}
+
+	pDB = aup->tx_db_inuse[aup->tx_head];
+
+#if 0
+	if (read_ir_reg(IR_RX_BYTE_CNT) != 0) {
+		printk("tx warning: rx byte cnt %x\n", 
+				read_ir_reg(IR_RX_BYTE_CNT));
+	}
+#endif
+	
+	if (aup->speed == 4000000) {
+		/* FIR */
+		memcpy((void *)pDB->vaddr, skb->data, skb->len);
+		ptxd->count_0 = skb->len & 0xff;
+		ptxd->count_1 = (skb->len >> 8) & 0xff;
+	}
+	else {
+		/* SIR */
+		len = async_wrap_skb(skb, (u8 *)pDB->vaddr, MAX_BUF_SIZE);
+		ptxd->count_0 = len & 0xff;
+		ptxd->count_1 = (len >> 8) & 0xff;
+		ptxd->flags |= IR_DIS_CRC;
+	}
+	ptxd->flags |= AU_OWN;
+	au_sync();
+
+	writel(read_ir_reg(IR_CONFIG_1) | IR_TX_ENABLE, IR_CONFIG_1); 
+	writel(0, IR_RING_PROMPT);
+	au_sync();
+
+	dev_kfree_skb(skb);
+	aup->tx_head = (aup->tx_head + 1) & (NUM_IR_DESC - 1);
+	dev->trans_start = jiffies;
+	return 0;
+}
+
+
+static inline void 
+update_rx_stats(struct net_device *dev, u32 status, u32 count)
+{
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+	struct net_device_stats *ps = &aup->stats;
+
+	ps->rx_packets++;
+
+	if (status & IR_RX_ERROR) {
+		ps->rx_errors++;
+		if (status & (IR_PHY_ERROR|IR_FIFO_OVER))
+			ps->rx_missed_errors++;
+		if (status & IR_MAX_LEN)
+			ps->rx_length_errors++;
+		if (status & IR_CRC_ERROR)
+			ps->rx_crc_errors++;
+	}
+	else 
+		ps->rx_bytes += count;
+}
+
+/*
+ * Au1000 receive routine.
+ */
+static int au1k_irda_rx(struct net_device *dev)
+{
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+	struct sk_buff *skb;
+	volatile ring_dest_t *prxd;
+	u32 flags, count;
+	db_dest_t *pDB;
+
+	prxd = aup->rx_ring[aup->rx_head];
+	flags = prxd->flags;
+
+	while (!(flags & AU_OWN))  {
+		pDB = aup->rx_db_inuse[aup->rx_head];
+		count = prxd->count_1<<8 | prxd->count_0;
+		if (!(flags & IR_RX_ERROR))  {
+			/* good frame */
+			update_rx_stats(dev, flags, count);
+			skb=alloc_skb(count+1,GFP_ATOMIC);
+			if (skb == NULL) {
+				aup->stats.rx_dropped++;
+				continue;
+			}
+			skb_reserve(skb, 1);
+			if (aup->speed == 4000000)
+				skb_put(skb, count);
+			else
+				skb_put(skb, count-2);
+			memcpy(skb->data, (void *)pDB->vaddr, count-2);
+			skb->dev = dev;
+			skb->mac.raw = skb->data;
+			skb->protocol = htons(ETH_P_IRDA);
+			netif_rx(skb);
+			prxd->count_0 = 0;
+			prxd->count_1 = 0;
+		}
+		prxd->flags |= AU_OWN;
+		aup->rx_head = (aup->rx_head + 1) & (NUM_IR_DESC - 1);
+		writel(0, IR_RING_PROMPT);
+		au_sync();
+
+		/* next descriptor */
+		prxd = aup->rx_ring[aup->rx_head];
+		flags = prxd->flags;
+		dev->last_rx = jiffies;
+
+	}
+	return 0;
+}
+
+
+void au1k_irda_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+
+	if (dev == NULL) {
+		printk(KERN_ERR "%s: isr: null dev ptr\n", dev->name);
+		return;
+	}
+
+	writel(0, IR_INT_CLEAR); /* ack irda interrupts */
+
+	au1k_irda_rx(dev);
+	au1k_tx_ack(dev);
+}
+
+
+/*
+ * The Tx ring has been full longer than the watchdog timeout
+ * value. The transmitter must be hung?
+ */
+static void au1k_tx_timeout(struct net_device *dev)
+{
+	u32 speed;
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+
+	printk(KERN_ERR "%s: tx timeout\n", dev->name);
+	speed = aup->speed;
+	aup->speed = 0;
+	au1k_irda_set_speed(dev, speed);
+	aup->tx_full = 0;
+	netif_wake_queue(dev);
+}
+
+
+/*
+ * Set the IrDA communications speed.
+ */
+static int 
+au1k_irda_set_speed(struct net_device *dev, int speed)
+{
+	unsigned long flags;
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+	u32 control;
+	int ret = 0, timeout = 10, i;
+	volatile ring_dest_t *ptxd;
+
+	if (speed == aup->speed)
+		return ret;
+
+	spin_lock_irqsave(&ir_lock, flags);
+
+	/* disable PHY first */
+	writel(read_ir_reg(IR_ENABLE) & ~0x8000, IR_ENABLE);
+
+	/* disable RX/TX */
+	writel(read_ir_reg(IR_CONFIG_1) & ~(IR_RX_ENABLE|IR_TX_ENABLE), 
+			IR_CONFIG_1);
+	au_sync_delay(1);
+	while (read_ir_reg(IR_ENABLE) & (IR_RX_STATUS | IR_TX_STATUS)) {
+		mdelay(1);
+		if (!timeout--) {
+			printk(KERN_ERR "%s: rx/tx disable timeout\n",
+					dev->name);
+			break;
+		}
+	}
+
+	/* disable DMA */
+	writel(read_ir_reg(IR_CONFIG_1) & ~IR_DMA_ENABLE, IR_CONFIG_1);
+	au_sync_delay(1);
+
+	/* 
+	 *  After we disable tx/rx. the index pointers
+ 	 * go back to zero.
+	 */
+	aup->tx_head = aup->tx_tail = aup->rx_head = 0;
+	for (i=0; i<NUM_IR_DESC; i++) {
+		ptxd = aup->tx_ring[i];
+		ptxd->flags = 0;
+		ptxd->count_0 = 0;
+		ptxd->count_1 = 0;
+	}
+
+	for (i=0; i<NUM_IR_DESC; i++) {
+		ptxd = aup->rx_ring[i];
+		ptxd->count_0 = 0;
+		ptxd->count_1 = 0;
+		ptxd->flags = AU_OWN;
+	}
+
+	if (speed == 4000000)
+		writel(1<<13, CPLD_AUX1);
+	else
+		writel(readl(CPLD_AUX1) & ~(1<<13), CPLD_AUX1);
+
+	switch (speed) {
+	case 9600:	
+		writel(11<<10 | 12<<5, IR_WRITE_PHY_CONFIG); 
+		writel(IR_SIR_MODE, IR_CONFIG_1); 
+		break;
+	case 19200:	
+		writel(5<<10 | 12<<5, IR_WRITE_PHY_CONFIG); 
+		writel(IR_SIR_MODE, IR_CONFIG_1); 
+		break;
+	case 38400:
+		writel(2<<10 | 12<<5, IR_WRITE_PHY_CONFIG); 
+		writel(IR_SIR_MODE, IR_CONFIG_1); 
+		break;
+	case 57600:	
+		writel(1<<10 | 12<<5, IR_WRITE_PHY_CONFIG); 
+		writel(IR_SIR_MODE, IR_CONFIG_1); 
+		break;
+	case 115200: 
+		writel(12<<5, IR_WRITE_PHY_CONFIG); 
+		writel(IR_SIR_MODE, IR_CONFIG_1); 
+		break;
+	case 4000000:
+		writel(0xF, IR_WRITE_PHY_CONFIG);
+		writel(IR_FIR|IR_DMA_ENABLE|IR_RX_ENABLE, IR_CONFIG_1); 
+		break;
+	default:
+		printk(KERN_ERR "%s unsupported speed %x\n", dev->name, speed);
+		ret = -EINVAL;
+		break;
+	}
+
+	aup->speed = speed;
+	writel(read_ir_reg(IR_ENABLE) | 0x8000, IR_ENABLE);
+	au_sync();
+
+	control = read_ir_reg(IR_ENABLE);
+	writel(0, IR_RING_PROMPT);
+	au_sync();
+
+	if (control & (1<<14)) {
+		printk(KERN_ERR "%s: configuration error\n", dev->name);
+	}
+	else {
+		if (control & (1<<11))
+			printk(KERN_INFO "%s Valid SIR config\n", dev->name);
+		if (control & (1<<12))
+			printk(KERN_INFO "%s Valid MIR config\n", dev->name);
+		if (control & (1<<13))
+			printk(KERN_INFO "%s Valid FIR config\n", dev->name);
+		if (control & (1<<10))
+			printk(KERN_INFO "%s TX enabled\n", dev->name);
+		if (control & (1<<9))
+			printk(KERN_INFO "%s RX enabled\n", dev->name);
+	}
+
+	spin_unlock_irqrestore(&ir_lock, flags);
+	return ret;
+}
+
+static int 
+au1k_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
+{
+	struct if_irda_req *rq = (struct if_irda_req *)ifreq;
+	struct au1k_private *aup = dev->priv;
+	int ret = -EOPNOTSUPP;
+
+	switch (cmd) {
+	case SIOCSBANDWIDTH:
+		if (capable(CAP_NET_ADMIN)) {
+			/*
+			 * We are unable to set the speed if the
+			 * device is not running.
+			 */
+			if (aup->open)
+				ret = au1k_irda_set_speed(dev,
+						rq->ifr_baudrate);
+			else {
+				printk(KERN_ERR "%s ioctl: !netif_running\n",
+						dev->name);
+				ret = 0;
+			}
+		}
+		break;
+
+	case SIOCSMEDIABUSY:
+		ret = -EPERM;
+		if (capable(CAP_NET_ADMIN)) {
+			irda_device_set_media_busy(dev, TRUE);
+			ret = 0;
+		}
+		break;
+
+	case SIOCGRECEIVING:
+		rq->ifr_receiving = 0;
+		break;
+	default:
+		break;
+	}
+	return ret;
+}
+
+
+static struct net_device_stats *au1k_irda_stats(struct net_device *dev)
+{
+	struct au1k_private *aup = (struct au1k_private *) dev->priv;
+	return &aup->stats;
+}
+
+#ifdef MODULE
+MODULE_AUTHOR("Pete Popov <ppopov@mvista.com>");
+MODULE_DESCRIPTION("Au1000 IrDA Device Driver");
+
+module_init(au1k_irda_init);
+module_exit(au1k_irda_exit);
+#endif /* MODULE */