Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2471 insertions, 0 deletions

diff --git a/drivers/s390/net/lcs.c b/drivers/s390/net/lcs.c
new file mode 100644
index 000000000..d8f99ff53
--- /dev/null
+++ b/drivers/s390/net/lcs.c
@@ -0,0 +1,2471 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Linux for S/390 Lan Channel Station Network Driver
+ *
+ *  Copyright IBM Corp. 1999, 2009
+ *  Author(s): Original Code written by
+ *			DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
+ *	       Rewritten by
+ *			Frank Pavlic <fpavlic@de.ibm.com> and
+ *			Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#define KMSG_COMPONENT		"lcs"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/module.h>
+#include <linux/if.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/fddidevice.h>
+#include <linux/inetdevice.h>
+#include <linux/in.h>
+#include <linux/igmp.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/slab.h>
+#include <net/arp.h>
+#include <net/ip.h>
+
+#include <asm/debug.h>
+#include <asm/idals.h>
+#include <asm/timex.h>
+#include <linux/device.h>
+#include <asm/ccwgroup.h>
+
+#include "lcs.h"
+
+
+#if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
+#error Cannot compile lcs.c without some net devices switched on.
+#endif
+
+/**
+ * initialization string for output
+ */
+
+static char version[] __initdata = "LCS driver";
+
+/**
+  * the root device for lcs group devices
+  */
+static struct device *lcs_root_dev;
+
+/**
+ * Some prototypes.
+ */
+static void lcs_tasklet(unsigned long);
+static void lcs_start_kernel_thread(struct work_struct *);
+static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
+#ifdef CONFIG_IP_MULTICAST
+static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
+#endif /* CONFIG_IP_MULTICAST */
+static int lcs_recovery(void *ptr);
+
+/**
+ * Debug Facility Stuff
+ */
+static char debug_buffer[255];
+static debug_info_t *lcs_dbf_setup;
+static debug_info_t *lcs_dbf_trace;
+
+/**
+ *  LCS Debug Facility functions
+ */
+static void
+lcs_unregister_debug_facility(void)
+{
+	debug_unregister(lcs_dbf_setup);
+	debug_unregister(lcs_dbf_trace);
+}
+
+static int
+lcs_register_debug_facility(void)
+{
+	lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
+	lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
+	if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
+		pr_err("Not enough memory for debug facility.\n");
+		lcs_unregister_debug_facility();
+		return -ENOMEM;
+	}
+	debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
+	debug_set_level(lcs_dbf_setup, 2);
+	debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
+	debug_set_level(lcs_dbf_trace, 2);
+	return 0;
+}
+
+/**
+ * Allocate io buffers.
+ */
+static int
+lcs_alloc_channel(struct lcs_channel *channel)
+{
+	int cnt;
+
+	LCS_DBF_TEXT(2, setup, "ichalloc");
+	for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
+		/* alloc memory fo iobuffer */
+		channel->iob[cnt].data =
+			kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
+		if (channel->iob[cnt].data == NULL)
+			break;
+		channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
+	}
+	if (cnt < LCS_NUM_BUFFS) {
+		/* Not all io buffers could be allocated. */
+		LCS_DBF_TEXT(2, setup, "echalloc");
+		while (cnt-- > 0)
+			kfree(channel->iob[cnt].data);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+/**
+ * Free io buffers.
+ */
+static void
+lcs_free_channel(struct lcs_channel *channel)
+{
+	int cnt;
+
+	LCS_DBF_TEXT(2, setup, "ichfree");
+	for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
+		kfree(channel->iob[cnt].data);
+		channel->iob[cnt].data = NULL;
+	}
+}
+
+/*
+ * Cleanup channel.
+ */
+static void
+lcs_cleanup_channel(struct lcs_channel *channel)
+{
+	LCS_DBF_TEXT(3, setup, "cleanch");
+	/* Kill write channel tasklets. */
+	tasklet_kill(&channel->irq_tasklet);
+	/* Free channel buffers. */
+	lcs_free_channel(channel);
+}
+
+/**
+ * LCS free memory for card and channels.
+ */
+static void
+lcs_free_card(struct lcs_card *card)
+{
+	LCS_DBF_TEXT(2, setup, "remcard");
+	LCS_DBF_HEX(2, setup, &card, sizeof(void*));
+	kfree(card);
+}
+
+/**
+ * LCS alloc memory for card and channels
+ */
+static struct lcs_card *
+lcs_alloc_card(void)
+{
+	struct lcs_card *card;
+	int rc;
+
+	LCS_DBF_TEXT(2, setup, "alloclcs");
+
+	card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
+	if (card == NULL)
+		return NULL;
+	card->lan_type = LCS_FRAME_TYPE_AUTO;
+	card->pkt_seq = 0;
+	card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
+	/* Allocate io buffers for the read channel. */
+	rc = lcs_alloc_channel(&card->read);
+	if (rc){
+		LCS_DBF_TEXT(2, setup, "iccwerr");
+		lcs_free_card(card);
+		return NULL;
+	}
+	/* Allocate io buffers for the write channel. */
+	rc = lcs_alloc_channel(&card->write);
+	if (rc) {
+		LCS_DBF_TEXT(2, setup, "iccwerr");
+		lcs_cleanup_channel(&card->read);
+		lcs_free_card(card);
+		return NULL;
+	}
+
+#ifdef CONFIG_IP_MULTICAST
+	INIT_LIST_HEAD(&card->ipm_list);
+#endif
+	LCS_DBF_HEX(2, setup, &card, sizeof(void*));
+	return card;
+}
+
+/*
+ * Setup read channel.
+ */
+static void
+lcs_setup_read_ccws(struct lcs_card *card)
+{
+	int cnt;
+
+	LCS_DBF_TEXT(2, setup, "ireadccw");
+	/* Setup read ccws. */
+	memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
+	for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
+		card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
+		card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
+		card->read.ccws[cnt].flags =
+			CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
+		/*
+		 * Note: we have allocated the buffer with GFP_DMA, so
+		 * we do not need to do set_normalized_cda.
+		 */
+		card->read.ccws[cnt].cda =
+			(__u32) __pa(card->read.iob[cnt].data);
+		((struct lcs_header *)
+		 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
+		card->read.iob[cnt].callback = lcs_get_frames_cb;
+		card->read.iob[cnt].state = LCS_BUF_STATE_READY;
+		card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
+	}
+	card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
+	card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
+	card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
+	/* Last ccw is a tic (transfer in channel). */
+	card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
+	card->read.ccws[LCS_NUM_BUFFS].cda =
+		(__u32) __pa(card->read.ccws);
+	/* Setg initial state of the read channel. */
+	card->read.state = LCS_CH_STATE_INIT;
+
+	card->read.io_idx = 0;
+	card->read.buf_idx = 0;
+}
+
+static void
+lcs_setup_read(struct lcs_card *card)
+{
+	LCS_DBF_TEXT(3, setup, "initread");
+
+	lcs_setup_read_ccws(card);
+	/* Initialize read channel tasklet. */
+	card->read.irq_tasklet.data = (unsigned long) &card->read;
+	card->read.irq_tasklet.func = lcs_tasklet;
+	/* Initialize waitqueue. */
+	init_waitqueue_head(&card->read.wait_q);
+}
+
+/*
+ * Setup write channel.
+ */
+static void
+lcs_setup_write_ccws(struct lcs_card *card)
+{
+	int cnt;
+
+	LCS_DBF_TEXT(3, setup, "iwritccw");
+	/* Setup write ccws. */
+	memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
+	for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
+		card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
+		card->write.ccws[cnt].count = 0;
+		card->write.ccws[cnt].flags =
+			CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
+		/*
+		 * Note: we have allocated the buffer with GFP_DMA, so
+		 * we do not need to do set_normalized_cda.
+		 */
+		card->write.ccws[cnt].cda =
+			(__u32) __pa(card->write.iob[cnt].data);
+	}
+	/* Last ccw is a tic (transfer in channel). */
+	card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
+	card->write.ccws[LCS_NUM_BUFFS].cda =
+		(__u32) __pa(card->write.ccws);
+	/* Set initial state of the write channel. */
+	card->read.state = LCS_CH_STATE_INIT;
+
+	card->write.io_idx = 0;
+	card->write.buf_idx = 0;
+}
+
+static void
+lcs_setup_write(struct lcs_card *card)
+{
+	LCS_DBF_TEXT(3, setup, "initwrit");
+
+	lcs_setup_write_ccws(card);
+	/* Initialize write channel tasklet. */
+	card->write.irq_tasklet.data = (unsigned long) &card->write;
+	card->write.irq_tasklet.func = lcs_tasklet;
+	/* Initialize waitqueue. */
+	init_waitqueue_head(&card->write.wait_q);
+}
+
+static void
+lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&card->mask_lock, flags);
+	card->thread_allowed_mask = threads;
+	spin_unlock_irqrestore(&card->mask_lock, flags);
+	wake_up(&card->wait_q);
+}
+static int lcs_threads_running(struct lcs_card *card, unsigned long threads)
+{
+        unsigned long flags;
+        int rc = 0;
+
+	spin_lock_irqsave(&card->mask_lock, flags);
+        rc = (card->thread_running_mask & threads);
+	spin_unlock_irqrestore(&card->mask_lock, flags);
+        return rc;
+}
+
+static int
+lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
+{
+        return wait_event_interruptible(card->wait_q,
+                        lcs_threads_running(card, threads) == 0);
+}
+
+static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
+{
+        unsigned long flags;
+
+	spin_lock_irqsave(&card->mask_lock, flags);
+        if ( !(card->thread_allowed_mask & thread) ||
+              (card->thread_start_mask & thread) ) {
+                spin_unlock_irqrestore(&card->mask_lock, flags);
+                return -EPERM;
+        }
+        card->thread_start_mask |= thread;
+	spin_unlock_irqrestore(&card->mask_lock, flags);
+        return 0;
+}
+
+static void
+lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
+{
+        unsigned long flags;
+
+	spin_lock_irqsave(&card->mask_lock, flags);
+        card->thread_running_mask &= ~thread;
+	spin_unlock_irqrestore(&card->mask_lock, flags);
+        wake_up(&card->wait_q);
+}
+
+static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
+{
+        unsigned long flags;
+        int rc = 0;
+
+	spin_lock_irqsave(&card->mask_lock, flags);
+        if (card->thread_start_mask & thread){
+                if ((card->thread_allowed_mask & thread) &&
+                    !(card->thread_running_mask & thread)){
+                        rc = 1;
+                        card->thread_start_mask &= ~thread;
+                        card->thread_running_mask |= thread;
+                } else
+                        rc = -EPERM;
+        }
+	spin_unlock_irqrestore(&card->mask_lock, flags);
+        return rc;
+}
+
+static int
+lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
+{
+        int rc = 0;
+        wait_event(card->wait_q,
+                   (rc = __lcs_do_run_thread(card, thread)) >= 0);
+        return rc;
+}
+
+static int
+lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
+{
+        unsigned long flags;
+        int rc = 0;
+
+	spin_lock_irqsave(&card->mask_lock, flags);
+        LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
+                        (u8) card->thread_start_mask,
+                        (u8) card->thread_allowed_mask,
+                        (u8) card->thread_running_mask);
+        rc = (card->thread_start_mask & thread);
+	spin_unlock_irqrestore(&card->mask_lock, flags);
+        return rc;
+}
+
+/**
+ * Initialize channels,card and state machines.
+ */
+static void
+lcs_setup_card(struct lcs_card *card)
+{
+	LCS_DBF_TEXT(2, setup, "initcard");
+	LCS_DBF_HEX(2, setup, &card, sizeof(void*));
+
+	lcs_setup_read(card);
+	lcs_setup_write(card);
+	/* Set cards initial state. */
+	card->state = DEV_STATE_DOWN;
+	card->tx_buffer = NULL;
+	card->tx_emitted = 0;
+
+	init_waitqueue_head(&card->wait_q);
+	spin_lock_init(&card->lock);
+	spin_lock_init(&card->ipm_lock);
+	spin_lock_init(&card->mask_lock);
+#ifdef CONFIG_IP_MULTICAST
+	INIT_LIST_HEAD(&card->ipm_list);
+#endif
+	INIT_LIST_HEAD(&card->lancmd_waiters);
+}
+
+static void lcs_clear_multicast_list(struct lcs_card *card)
+{
+#ifdef	CONFIG_IP_MULTICAST
+	struct lcs_ipm_list *ipm;
+	unsigned long flags;
+
+	/* Free multicast list. */
+	LCS_DBF_TEXT(3, setup, "clmclist");
+	spin_lock_irqsave(&card->ipm_lock, flags);
+	while (!list_empty(&card->ipm_list)){
+		ipm = list_entry(card->ipm_list.next,
+				 struct lcs_ipm_list, list);
+		list_del(&ipm->list);
+		if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
+			spin_unlock_irqrestore(&card->ipm_lock, flags);
+			lcs_send_delipm(card, ipm);
+			spin_lock_irqsave(&card->ipm_lock, flags);
+		}
+		kfree(ipm);
+	}
+	spin_unlock_irqrestore(&card->ipm_lock, flags);
+#endif
+}
+/**
+ * Cleanup channels,card and state machines.
+ */
+static void
+lcs_cleanup_card(struct lcs_card *card)
+{
+
+	LCS_DBF_TEXT(3, setup, "cleancrd");
+	LCS_DBF_HEX(2,setup,&card,sizeof(void*));
+
+	if (card->dev != NULL)
+		free_netdev(card->dev);
+	/* Cleanup channels. */
+	lcs_cleanup_channel(&card->write);
+	lcs_cleanup_channel(&card->read);
+}
+
+/**
+ * Start channel.
+ */
+static int
+lcs_start_channel(struct lcs_channel *channel)
+{
+	unsigned long flags;
+	int rc;
+
+	LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
+	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
+	rc = ccw_device_start(channel->ccwdev,
+			      channel->ccws + channel->io_idx, 0, 0,
+			      DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
+	if (rc == 0)
+		channel->state = LCS_CH_STATE_RUNNING;
+	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
+	if (rc) {
+		LCS_DBF_TEXT_(4,trace,"essh%s",
+			      dev_name(&channel->ccwdev->dev));
+		dev_err(&channel->ccwdev->dev,
+			"Starting an LCS device resulted in an error,"
+			" rc=%d!\n", rc);
+	}
+	return rc;
+}
+
+static int
+lcs_clear_channel(struct lcs_channel *channel)
+{
+	unsigned long flags;
+	int rc;
+
+	LCS_DBF_TEXT(4,trace,"clearch");
+	LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
+	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
+	rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
+	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
+	if (rc) {
+		LCS_DBF_TEXT_(4, trace, "ecsc%s",
+			      dev_name(&channel->ccwdev->dev));
+		return rc;
+	}
+	wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
+	channel->state = LCS_CH_STATE_STOPPED;
+	return rc;
+}
+
+
+/**
+ * Stop channel.
+ */
+static int
+lcs_stop_channel(struct lcs_channel *channel)
+{
+	unsigned long flags;
+	int rc;
+
+	if (channel->state == LCS_CH_STATE_STOPPED)
+		return 0;
+	LCS_DBF_TEXT(4,trace,"haltsch");
+	LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
+	channel->state = LCS_CH_STATE_INIT;
+	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
+	rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
+	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
+	if (rc) {
+		LCS_DBF_TEXT_(4, trace, "ehsc%s",
+			      dev_name(&channel->ccwdev->dev));
+		return rc;
+	}
+	/* Asynchronous halt initialted. Wait for its completion. */
+	wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
+	lcs_clear_channel(channel);
+	return 0;
+}
+
+/**
+ * start read and write channel
+ */
+static int
+lcs_start_channels(struct lcs_card *card)
+{
+	int rc;
+
+	LCS_DBF_TEXT(2, trace, "chstart");
+	/* start read channel */
+	rc = lcs_start_channel(&card->read);
+	if (rc)
+		return rc;
+	/* start write channel */
+	rc = lcs_start_channel(&card->write);
+	if (rc)
+		lcs_stop_channel(&card->read);
+	return rc;
+}
+
+/**
+ * stop read and write channel
+ */
+static int
+lcs_stop_channels(struct lcs_card *card)
+{
+	LCS_DBF_TEXT(2, trace, "chhalt");
+	lcs_stop_channel(&card->read);
+	lcs_stop_channel(&card->write);
+	return 0;
+}
+
+/**
+ * Get empty buffer.
+ */
+static struct lcs_buffer *
+__lcs_get_buffer(struct lcs_channel *channel)
+{
+	int index;
+
+	LCS_DBF_TEXT(5, trace, "_getbuff");
+	index = channel->io_idx;
+	do {
+		if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
+			channel->iob[index].state = LCS_BUF_STATE_LOCKED;
+			return channel->iob + index;
+		}
+		index = (index + 1) & (LCS_NUM_BUFFS - 1);
+	} while (index != channel->io_idx);
+	return NULL;
+}
+
+static struct lcs_buffer *
+lcs_get_buffer(struct lcs_channel *channel)
+{
+	struct lcs_buffer *buffer;
+	unsigned long flags;
+
+	LCS_DBF_TEXT(5, trace, "getbuff");
+	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
+	buffer = __lcs_get_buffer(channel);
+	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
+	return buffer;
+}
+
+/**
+ * Resume channel program if the channel is suspended.
+ */
+static int
+__lcs_resume_channel(struct lcs_channel *channel)
+{
+	int rc;
+
+	if (channel->state != LCS_CH_STATE_SUSPENDED)
+		return 0;
+	if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
+		return 0;
+	LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
+	rc = ccw_device_resume(channel->ccwdev);
+	if (rc) {
+		LCS_DBF_TEXT_(4, trace, "ersc%s",
+			      dev_name(&channel->ccwdev->dev));
+		dev_err(&channel->ccwdev->dev,
+			"Sending data from the LCS device to the LAN failed"
+			" with rc=%d\n",rc);
+	} else
+		channel->state = LCS_CH_STATE_RUNNING;
+	return rc;
+
+}
+
+/**
+ * Make a buffer ready for processing.
+ */
+static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
+{
+	int prev, next;
+
+	LCS_DBF_TEXT(5, trace, "rdybits");
+	prev = (index - 1) & (LCS_NUM_BUFFS - 1);
+	next = (index + 1) & (LCS_NUM_BUFFS - 1);
+	/* Check if we may clear the suspend bit of this buffer. */
+	if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
+		/* Check if we have to set the PCI bit. */
+		if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
+			/* Suspend bit of the previous buffer is not set. */
+			channel->ccws[index].flags |= CCW_FLAG_PCI;
+		/* Suspend bit of the next buffer is set. */
+		channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
+	}
+}
+
+static int
+lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
+{
+	unsigned long flags;
+	int index, rc;
+
+	LCS_DBF_TEXT(5, trace, "rdybuff");
+	BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
+	       buffer->state != LCS_BUF_STATE_PROCESSED);
+	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
+	buffer->state = LCS_BUF_STATE_READY;
+	index = buffer - channel->iob;
+	/* Set length. */
+	channel->ccws[index].count = buffer->count;
+	/* Check relevant PCI/suspend bits. */
+	__lcs_ready_buffer_bits(channel, index);
+	rc = __lcs_resume_channel(channel);
+	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
+	return rc;
+}
+
+/**
+ * Mark the buffer as processed. Take care of the suspend bit
+ * of the previous buffer. This function is called from
+ * interrupt context, so the lock must not be taken.
+ */
+static int
+__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
+{
+	int index, prev, next;
+
+	LCS_DBF_TEXT(5, trace, "prcsbuff");
+	BUG_ON(buffer->state != LCS_BUF_STATE_READY);
+	buffer->state = LCS_BUF_STATE_PROCESSED;
+	index = buffer - channel->iob;
+	prev = (index - 1) & (LCS_NUM_BUFFS - 1);
+	next = (index + 1) & (LCS_NUM_BUFFS - 1);
+	/* Set the suspend bit and clear the PCI bit of this buffer. */
+	channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
+	channel->ccws[index].flags &= ~CCW_FLAG_PCI;
+	/* Check the suspend bit of the previous buffer. */
+	if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
+		/*
+		 * Previous buffer is in state ready. It might have
+		 * happened in lcs_ready_buffer that the suspend bit
+		 * has not been cleared to avoid an endless loop.
+		 * Do it now.
+		 */
+		__lcs_ready_buffer_bits(channel, prev);
+	}
+	/* Clear PCI bit of next buffer. */
+	channel->ccws[next].flags &= ~CCW_FLAG_PCI;
+	return __lcs_resume_channel(channel);
+}
+
+/**
+ * Put a processed buffer back to state empty.
+ */
+static void
+lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
+{
+	unsigned long flags;
+
+	LCS_DBF_TEXT(5, trace, "relbuff");
+	BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
+	       buffer->state != LCS_BUF_STATE_PROCESSED);
+	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
+	buffer->state = LCS_BUF_STATE_EMPTY;
+	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
+}
+
+/**
+ * Get buffer for a lan command.
+ */
+static struct lcs_buffer *
+lcs_get_lancmd(struct lcs_card *card, int count)
+{
+	struct lcs_buffer *buffer;
+	struct lcs_cmd *cmd;
+
+	LCS_DBF_TEXT(4, trace, "getlncmd");
+	/* Get buffer and wait if none is available. */
+	wait_event(card->write.wait_q,
+		   ((buffer = lcs_get_buffer(&card->write)) != NULL));
+	count += sizeof(struct lcs_header);
+	*(__u16 *)(buffer->data + count) = 0;
+	buffer->count = count + sizeof(__u16);
+	buffer->callback = lcs_release_buffer;
+	cmd = (struct lcs_cmd *) buffer->data;
+	cmd->offset = count;
+	cmd->type = LCS_FRAME_TYPE_CONTROL;
+	cmd->slot = 0;
+	return buffer;
+}
+
+
+static void
+lcs_get_reply(struct lcs_reply *reply)
+{
+	refcount_inc(&reply->refcnt);
+}
+
+static void
+lcs_put_reply(struct lcs_reply *reply)
+{
+	if (refcount_dec_and_test(&reply->refcnt))
+		kfree(reply);
+}
+
+static struct lcs_reply *
+lcs_alloc_reply(struct lcs_cmd *cmd)
+{
+	struct lcs_reply *reply;
+
+	LCS_DBF_TEXT(4, trace, "getreply");
+
+	reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
+	if (!reply)
+		return NULL;
+	refcount_set(&reply->refcnt, 1);
+	reply->sequence_no = cmd->sequence_no;
+	reply->received = 0;
+	reply->rc = 0;
+	init_waitqueue_head(&reply->wait_q);
+
+	return reply;
+}
+
+/**
+ * Notifier function for lancmd replies. Called from read irq.
+ */
+static void
+lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
+{
+	struct list_head *l, *n;
+	struct lcs_reply *reply;
+
+	LCS_DBF_TEXT(4, trace, "notiwait");
+	spin_lock(&card->lock);
+	list_for_each_safe(l, n, &card->lancmd_waiters) {
+		reply = list_entry(l, struct lcs_reply, list);
+		if (reply->sequence_no == cmd->sequence_no) {
+			lcs_get_reply(reply);
+			list_del_init(&reply->list);
+			if (reply->callback != NULL)
+				reply->callback(card, cmd);
+			reply->received = 1;
+			reply->rc = cmd->return_code;
+			wake_up(&reply->wait_q);
+			lcs_put_reply(reply);
+			break;
+		}
+	}
+	spin_unlock(&card->lock);
+}
+
+/**
+ * Emit buffer of a lan command.
+ */
+static void
+lcs_lancmd_timeout(struct timer_list *t)
+{
+	struct lcs_reply *reply = from_timer(reply, t, timer);
+	struct lcs_reply *list_reply, *r;
+	unsigned long flags;
+
+	LCS_DBF_TEXT(4, trace, "timeout");
+	spin_lock_irqsave(&reply->card->lock, flags);
+	list_for_each_entry_safe(list_reply, r,
+				 &reply->card->lancmd_waiters,list) {
+		if (reply == list_reply) {
+			lcs_get_reply(reply);
+			list_del_init(&reply->list);
+			spin_unlock_irqrestore(&reply->card->lock, flags);
+			reply->received = 1;
+			reply->rc = -ETIME;
+			wake_up(&reply->wait_q);
+			lcs_put_reply(reply);
+			return;
+		}
+	}
+	spin_unlock_irqrestore(&reply->card->lock, flags);
+}
+
+static int
+lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
+		void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
+{
+	struct lcs_reply *reply;
+	struct lcs_cmd *cmd;
+	unsigned long flags;
+	int rc;
+
+	LCS_DBF_TEXT(4, trace, "sendcmd");
+	cmd = (struct lcs_cmd *) buffer->data;
+	cmd->return_code = 0;
+	cmd->sequence_no = card->sequence_no++;
+	reply = lcs_alloc_reply(cmd);
+	if (!reply)
+		return -ENOMEM;
+	reply->callback = reply_callback;
+	reply->card = card;
+	spin_lock_irqsave(&card->lock, flags);
+	list_add_tail(&reply->list, &card->lancmd_waiters);
+	spin_unlock_irqrestore(&card->lock, flags);
+
+	buffer->callback = lcs_release_buffer;
+	rc = lcs_ready_buffer(&card->write, buffer);
+	if (rc)
+		return rc;
+	timer_setup(&reply->timer, lcs_lancmd_timeout, 0);
+	mod_timer(&reply->timer, jiffies + HZ * card->lancmd_timeout);
+	wait_event(reply->wait_q, reply->received);
+	del_timer_sync(&reply->timer);
+	LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
+	rc = reply->rc;
+	lcs_put_reply(reply);
+	return rc ? -EIO : 0;
+}
+
+/**
+ * LCS startup command
+ */
+static int
+lcs_send_startup(struct lcs_card *card, __u8 initiator)
+{
+	struct lcs_buffer *buffer;
+	struct lcs_cmd *cmd;
+
+	LCS_DBF_TEXT(2, trace, "startup");
+	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
+	cmd = (struct lcs_cmd *) buffer->data;
+	cmd->cmd_code = LCS_CMD_STARTUP;
+	cmd->initiator = initiator;
+	cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
+	return lcs_send_lancmd(card, buffer, NULL);
+}
+
+/**
+ * LCS shutdown command
+ */
+static int
+lcs_send_shutdown(struct lcs_card *card)
+{
+	struct lcs_buffer *buffer;
+	struct lcs_cmd *cmd;
+
+	LCS_DBF_TEXT(2, trace, "shutdown");
+	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
+	cmd = (struct lcs_cmd *) buffer->data;
+	cmd->cmd_code = LCS_CMD_SHUTDOWN;
+	cmd->initiator = LCS_INITIATOR_TCPIP;
+	return lcs_send_lancmd(card, buffer, NULL);
+}
+
+/**
+ * LCS lanstat command
+ */
+static void
+__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
+{
+	LCS_DBF_TEXT(2, trace, "statcb");
+	memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
+}
+
+static int
+lcs_send_lanstat(struct lcs_card *card)
+{
+	struct lcs_buffer *buffer;
+	struct lcs_cmd *cmd;
+
+	LCS_DBF_TEXT(2,trace, "cmdstat");
+	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
+	cmd = (struct lcs_cmd *) buffer->data;
+	/* Setup lanstat command. */
+	cmd->cmd_code = LCS_CMD_LANSTAT;
+	cmd->initiator = LCS_INITIATOR_TCPIP;
+	cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
+	cmd->cmd.lcs_std_cmd.portno = card->portno;
+	return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
+}
+
+/**
+ * send stoplan command
+ */
+static int
+lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
+{
+	struct lcs_buffer *buffer;
+	struct lcs_cmd *cmd;
+
+	LCS_DBF_TEXT(2, trace, "cmdstpln");
+	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
+	cmd = (struct lcs_cmd *) buffer->data;
+	cmd->cmd_code = LCS_CMD_STOPLAN;
+	cmd->initiator = initiator;
+	cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
+	cmd->cmd.lcs_std_cmd.portno = card->portno;
+	return lcs_send_lancmd(card, buffer, NULL);
+}
+
+/**
+ * send startlan command
+ */
+static void
+__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
+{
+	LCS_DBF_TEXT(2, trace, "srtlancb");
+	card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
+	card->portno = cmd->cmd.lcs_std_cmd.portno;
+}
+
+static int
+lcs_send_startlan(struct lcs_card *card, __u8 initiator)
+{
+	struct lcs_buffer *buffer;
+	struct lcs_cmd *cmd;
+
+	LCS_DBF_TEXT(2, trace, "cmdstaln");
+	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
+	cmd = (struct lcs_cmd *) buffer->data;
+	cmd->cmd_code = LCS_CMD_STARTLAN;
+	cmd->initiator = initiator;
+	cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
+	cmd->cmd.lcs_std_cmd.portno = card->portno;
+	return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
+}
+
+#ifdef CONFIG_IP_MULTICAST
+/**
+ * send setipm command (Multicast)
+ */
+static int
+lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
+{
+	struct lcs_buffer *buffer;
+	struct lcs_cmd *cmd;
+
+	LCS_DBF_TEXT(2, trace, "cmdsetim");
+	buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
+	cmd = (struct lcs_cmd *) buffer->data;
+	cmd->cmd_code = LCS_CMD_SETIPM;
+	cmd->initiator = LCS_INITIATOR_TCPIP;
+	cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
+	cmd->cmd.lcs_qipassist.portno = card->portno;
+	cmd->cmd.lcs_qipassist.version = 4;
+	cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
+	memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
+	       &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
+	LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
+	return lcs_send_lancmd(card, buffer, NULL);
+}
+
+/**
+ * send delipm command (Multicast)
+ */
+static int
+lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
+{
+	struct lcs_buffer *buffer;
+	struct lcs_cmd *cmd;
+
+	LCS_DBF_TEXT(2, trace, "cmddelim");
+	buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
+	cmd = (struct lcs_cmd *) buffer->data;
+	cmd->cmd_code = LCS_CMD_DELIPM;
+	cmd->initiator = LCS_INITIATOR_TCPIP;
+	cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
+	cmd->cmd.lcs_qipassist.portno = card->portno;
+	cmd->cmd.lcs_qipassist.version = 4;
+	cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
+	memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
+	       &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
+	LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
+	return lcs_send_lancmd(card, buffer, NULL);
+}
+
+/**
+ * check if multicast is supported by LCS
+ */
+static void
+__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
+{
+	LCS_DBF_TEXT(2, trace, "chkmccb");
+	card->ip_assists_supported =
+		cmd->cmd.lcs_qipassist.ip_assists_supported;
+	card->ip_assists_enabled =
+		cmd->cmd.lcs_qipassist.ip_assists_enabled;
+}
+
+static int
+lcs_check_multicast_support(struct lcs_card *card)
+{
+	struct lcs_buffer *buffer;
+	struct lcs_cmd *cmd;
+	int rc;
+
+	LCS_DBF_TEXT(2, trace, "cmdqipa");
+	/* Send query ipassist. */
+	buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
+	cmd = (struct lcs_cmd *) buffer->data;
+	cmd->cmd_code = LCS_CMD_QIPASSIST;
+	cmd->initiator = LCS_INITIATOR_TCPIP;
+	cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
+	cmd->cmd.lcs_qipassist.portno = card->portno;
+	cmd->cmd.lcs_qipassist.version = 4;
+	cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
+	rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
+	if (rc != 0) {
+		pr_err("Query IPAssist failed. Assuming unsupported!\n");
+		return -EOPNOTSUPP;
+	}
+	if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
+		return 0;
+	return -EOPNOTSUPP;
+}
+
+/**
+ * set or del multicast address on LCS card
+ */
+static void
+lcs_fix_multicast_list(struct lcs_card *card)
+{
+	struct list_head failed_list;
+	struct lcs_ipm_list *ipm, *tmp;
+	unsigned long flags;
+	int rc;
+
+	LCS_DBF_TEXT(4,trace, "fixipm");
+	INIT_LIST_HEAD(&failed_list);
+	spin_lock_irqsave(&card->ipm_lock, flags);
+list_modified:
+	list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
+		switch (ipm->ipm_state) {
+		case LCS_IPM_STATE_SET_REQUIRED:
+			/* del from ipm_list so no one else can tamper with
+			 * this entry */
+			list_del_init(&ipm->list);
+			spin_unlock_irqrestore(&card->ipm_lock, flags);
+			rc = lcs_send_setipm(card, ipm);
+			spin_lock_irqsave(&card->ipm_lock, flags);
+			if (rc) {
+				pr_info("Adding multicast address failed."
+					" Table possibly full!\n");
+				/* store ipm in failed list -> will be added
+				 * to ipm_list again, so a retry will be done
+				 * during the next call of this function */
+				list_add_tail(&ipm->list, &failed_list);
+			} else {
+				ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
+				/* re-insert into ipm_list */
+				list_add_tail(&ipm->list, &card->ipm_list);
+			}
+			goto list_modified;
+		case LCS_IPM_STATE_DEL_REQUIRED:
+			list_del(&ipm->list);
+			spin_unlock_irqrestore(&card->ipm_lock, flags);
+			lcs_send_delipm(card, ipm);
+			spin_lock_irqsave(&card->ipm_lock, flags);
+			kfree(ipm);
+			goto list_modified;
+		case LCS_IPM_STATE_ON_CARD:
+			break;
+		}
+	}
+	/* re-insert all entries from the failed_list into ipm_list */
+	list_for_each_entry_safe(ipm, tmp, &failed_list, list)
+		list_move_tail(&ipm->list, &card->ipm_list);
+
+	spin_unlock_irqrestore(&card->ipm_lock, flags);
+}
+
+/**
+ * get mac address for the relevant Multicast address
+ */
+static void
+lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
+{
+	LCS_DBF_TEXT(4,trace, "getmac");
+	ip_eth_mc_map(ipm, mac);
+}
+
+/**
+ * function called by net device to handle multicast address relevant things
+ */
+static void lcs_remove_mc_addresses(struct lcs_card *card,
+				    struct in_device *in4_dev)
+{
+	struct ip_mc_list *im4;
+	struct list_head *l;
+	struct lcs_ipm_list *ipm;
+	unsigned long flags;
+	char buf[MAX_ADDR_LEN];
+
+	LCS_DBF_TEXT(4, trace, "remmclst");
+	spin_lock_irqsave(&card->ipm_lock, flags);
+	list_for_each(l, &card->ipm_list) {
+		ipm = list_entry(l, struct lcs_ipm_list, list);
+		for (im4 = rcu_dereference(in4_dev->mc_list);
+		     im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
+			lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
+			if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
+			     (memcmp(buf, &ipm->ipm.mac_addr,
+				     LCS_MAC_LENGTH) == 0) )
+				break;
+		}
+		if (im4 == NULL)
+			ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
+	}
+	spin_unlock_irqrestore(&card->ipm_lock, flags);
+}
+
+static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card,
+						 struct ip_mc_list *im4,
+						 char *buf)
+{
+	struct lcs_ipm_list *tmp, *ipm = NULL;
+	struct list_head *l;
+	unsigned long flags;
+
+	LCS_DBF_TEXT(4, trace, "chkmcent");
+	spin_lock_irqsave(&card->ipm_lock, flags);
+	list_for_each(l, &card->ipm_list) {
+		tmp = list_entry(l, struct lcs_ipm_list, list);
+		if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
+		     (memcmp(buf, &tmp->ipm.mac_addr,
+			     LCS_MAC_LENGTH) == 0) ) {
+			ipm = tmp;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&card->ipm_lock, flags);
+	return ipm;
+}
+
+static void lcs_set_mc_addresses(struct lcs_card *card,
+				 struct in_device *in4_dev)
+{
+
+	struct ip_mc_list *im4;
+	struct lcs_ipm_list *ipm;
+	char buf[MAX_ADDR_LEN];
+	unsigned long flags;
+
+	LCS_DBF_TEXT(4, trace, "setmclst");
+	for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
+	     im4 = rcu_dereference(im4->next_rcu)) {
+		lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
+		ipm = lcs_check_addr_entry(card, im4, buf);
+		if (ipm != NULL)
+			continue;	/* Address already in list. */
+		ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
+		if (ipm == NULL) {
+			pr_info("Not enough memory to add"
+				" new multicast entry!\n");
+			break;
+		}
+		memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
+		ipm->ipm.ip_addr = im4->multiaddr;
+		ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
+		spin_lock_irqsave(&card->ipm_lock, flags);
+		LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
+		list_add(&ipm->list, &card->ipm_list);
+		spin_unlock_irqrestore(&card->ipm_lock, flags);
+	}
+}
+
+static int
+lcs_register_mc_addresses(void *data)
+{
+	struct lcs_card *card;
+	struct in_device *in4_dev;
+
+	card = (struct lcs_card *) data;
+
+	if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
+		return 0;
+	LCS_DBF_TEXT(4, trace, "regmulti");
+
+	in4_dev = in_dev_get(card->dev);
+	if (in4_dev == NULL)
+		goto out;
+	rcu_read_lock();
+	lcs_remove_mc_addresses(card,in4_dev);
+	lcs_set_mc_addresses(card, in4_dev);
+	rcu_read_unlock();
+	in_dev_put(in4_dev);
+
+	netif_carrier_off(card->dev);
+	netif_tx_disable(card->dev);
+	wait_event(card->write.wait_q,
+			(card->write.state != LCS_CH_STATE_RUNNING));
+	lcs_fix_multicast_list(card);
+	if (card->state == DEV_STATE_UP) {
+		netif_carrier_on(card->dev);
+		netif_wake_queue(card->dev);
+	}
+out:
+	lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
+	return 0;
+}
+#endif /* CONFIG_IP_MULTICAST */
+
+/**
+ * function called by net device to
+ * handle multicast address relevant things
+ */
+static void
+lcs_set_multicast_list(struct net_device *dev)
+{
+#ifdef CONFIG_IP_MULTICAST
+        struct lcs_card *card;
+
+        LCS_DBF_TEXT(4, trace, "setmulti");
+        card = (struct lcs_card *) dev->ml_priv;
+
+        if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
+		schedule_work(&card->kernel_thread_starter);
+#endif /* CONFIG_IP_MULTICAST */
+}
+
+static long
+lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
+{
+	if (!IS_ERR(irb))
+		return 0;
+
+	switch (PTR_ERR(irb)) {
+	case -EIO:
+		dev_warn(&cdev->dev,
+			"An I/O-error occurred on the LCS device\n");
+		LCS_DBF_TEXT(2, trace, "ckirberr");
+		LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
+		break;
+	case -ETIMEDOUT:
+		dev_warn(&cdev->dev,
+			"A command timed out on the LCS device\n");
+		LCS_DBF_TEXT(2, trace, "ckirberr");
+		LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
+		break;
+	default:
+		dev_warn(&cdev->dev,
+			"An error occurred on the LCS device, rc=%ld\n",
+			PTR_ERR(irb));
+		LCS_DBF_TEXT(2, trace, "ckirberr");
+		LCS_DBF_TEXT(2, trace, "  rc???");
+	}
+	return PTR_ERR(irb);
+}
+
+static int
+lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
+{
+	int dstat, cstat;
+	char *sense;
+
+	sense = (char *) irb->ecw;
+	cstat = irb->scsw.cmd.cstat;
+	dstat = irb->scsw.cmd.dstat;
+
+	if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
+		     SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
+		     SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
+		LCS_DBF_TEXT(2, trace, "CGENCHK");
+		return 1;
+	}
+	if (dstat & DEV_STAT_UNIT_CHECK) {
+		if (sense[LCS_SENSE_BYTE_1] &
+		    LCS_SENSE_RESETTING_EVENT) {
+			LCS_DBF_TEXT(2, trace, "REVIND");
+			return 1;
+		}
+		if (sense[LCS_SENSE_BYTE_0] &
+		    LCS_SENSE_CMD_REJECT) {
+			LCS_DBF_TEXT(2, trace, "CMDREJ");
+			return 0;
+		}
+		if ((!sense[LCS_SENSE_BYTE_0]) &&
+		    (!sense[LCS_SENSE_BYTE_1]) &&
+		    (!sense[LCS_SENSE_BYTE_2]) &&
+		    (!sense[LCS_SENSE_BYTE_3])) {
+			LCS_DBF_TEXT(2, trace, "ZEROSEN");
+			return 0;
+		}
+		LCS_DBF_TEXT(2, trace, "DGENCHK");
+		return 1;
+	}
+	return 0;
+}
+
+static void
+lcs_schedule_recovery(struct lcs_card *card)
+{
+	LCS_DBF_TEXT(2, trace, "startrec");
+	if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
+		schedule_work(&card->kernel_thread_starter);
+}
+
+/**
+ * IRQ Handler for LCS channels
+ */
+static void
+lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
+{
+	struct lcs_card *card;
+	struct lcs_channel *channel;
+	int rc, index;
+	int cstat, dstat;
+
+	if (lcs_check_irb_error(cdev, irb))
+		return;
+
+	card = CARD_FROM_DEV(cdev);
+	if (card->read.ccwdev == cdev)
+		channel = &card->read;
+	else
+		channel = &card->write;
+
+	cstat = irb->scsw.cmd.cstat;
+	dstat = irb->scsw.cmd.dstat;
+	LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
+	LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
+		      irb->scsw.cmd.dstat);
+	LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
+		      irb->scsw.cmd.actl);
+
+	/* Check for channel and device errors presented */
+	rc = lcs_get_problem(cdev, irb);
+	if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
+		dev_warn(&cdev->dev,
+			"The LCS device stopped because of an error,"
+			" dstat=0x%X, cstat=0x%X \n",
+			    dstat, cstat);
+		if (rc) {
+			channel->state = LCS_CH_STATE_ERROR;
+		}
+	}
+	if (channel->state == LCS_CH_STATE_ERROR) {
+		lcs_schedule_recovery(card);
+		wake_up(&card->wait_q);
+		return;
+	}
+	/* How far in the ccw chain have we processed? */
+	if ((channel->state != LCS_CH_STATE_INIT) &&
+	    (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
+	    (irb->scsw.cmd.cpa != 0)) {
+		index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
+			- channel->ccws;
+		if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
+		    (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
+			/* Bloody io subsystem tells us lies about cpa... */
+			index = (index - 1) & (LCS_NUM_BUFFS - 1);
+		while (channel->io_idx != index) {
+			__lcs_processed_buffer(channel,
+					       channel->iob + channel->io_idx);
+			channel->io_idx =
+				(channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
+		}
+	}
+
+	if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
+	    (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
+	    (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
+		/* Mark channel as stopped. */
+		channel->state = LCS_CH_STATE_STOPPED;
+	else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
+		/* CCW execution stopped on a suspend bit. */
+		channel->state = LCS_CH_STATE_SUSPENDED;
+	if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
+		if (irb->scsw.cmd.cc != 0) {
+			ccw_device_halt(channel->ccwdev, (addr_t) channel);
+			return;
+		}
+		/* The channel has been stopped by halt_IO. */
+		channel->state = LCS_CH_STATE_HALTED;
+	}
+	if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
+		channel->state = LCS_CH_STATE_CLEARED;
+	/* Do the rest in the tasklet. */
+	tasklet_schedule(&channel->irq_tasklet);
+}
+
+/**
+ * Tasklet for IRQ handler
+ */
+static void
+lcs_tasklet(unsigned long data)
+{
+	unsigned long flags;
+	struct lcs_channel *channel;
+	struct lcs_buffer *iob;
+	int buf_idx;
+
+	channel = (struct lcs_channel *) data;
+	LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
+
+	/* Check for processed buffers. */
+	iob = channel->iob;
+	buf_idx = channel->buf_idx;
+	while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
+		/* Do the callback thing. */
+		if (iob[buf_idx].callback != NULL)
+			iob[buf_idx].callback(channel, iob + buf_idx);
+		buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
+	}
+	channel->buf_idx = buf_idx;
+
+	if (channel->state == LCS_CH_STATE_STOPPED)
+		lcs_start_channel(channel);
+	spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
+	if (channel->state == LCS_CH_STATE_SUSPENDED &&
+	    channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
+		__lcs_resume_channel(channel);
+	spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
+
+	/* Something happened on the channel. Wake up waiters. */
+	wake_up(&channel->wait_q);
+}
+
+/**
+ * Finish current tx buffer and make it ready for transmit.
+ */
+static void
+__lcs_emit_txbuffer(struct lcs_card *card)
+{
+	LCS_DBF_TEXT(5, trace, "emittx");
+	*(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
+	card->tx_buffer->count += 2;
+	lcs_ready_buffer(&card->write, card->tx_buffer);
+	card->tx_buffer = NULL;
+	card->tx_emitted++;
+}
+
+/**
+ * Callback for finished tx buffers.
+ */
+static void
+lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
+{
+	struct lcs_card *card;
+
+	LCS_DBF_TEXT(5, trace, "txbuffcb");
+	/* Put buffer back to pool. */
+	lcs_release_buffer(channel, buffer);
+	card = container_of(channel, struct lcs_card, write);
+	if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
+		netif_wake_queue(card->dev);
+	spin_lock(&card->lock);
+	card->tx_emitted--;
+	if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
+		/*
+		 * Last running tx buffer has finished. Submit partially
+		 * filled current buffer.
+		 */
+		__lcs_emit_txbuffer(card);
+	spin_unlock(&card->lock);
+}
+
+/**
+ * Packet transmit function called by network stack
+ */
+static int
+__lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
+		 struct net_device *dev)
+{
+	struct lcs_header *header;
+	int rc = NETDEV_TX_OK;
+
+	LCS_DBF_TEXT(5, trace, "hardxmit");
+	if (skb == NULL) {
+		card->stats.tx_dropped++;
+		card->stats.tx_errors++;
+		return NETDEV_TX_OK;
+	}
+	if (card->state != DEV_STATE_UP) {
+		dev_kfree_skb(skb);
+		card->stats.tx_dropped++;
+		card->stats.tx_errors++;
+		card->stats.tx_carrier_errors++;
+		return NETDEV_TX_OK;
+	}
+	if (skb->protocol == htons(ETH_P_IPV6)) {
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+	}
+	netif_stop_queue(card->dev);
+	spin_lock(&card->lock);
+	if (card->tx_buffer != NULL &&
+	    card->tx_buffer->count + sizeof(struct lcs_header) +
+	    skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
+		/* skb too big for current tx buffer. */
+		__lcs_emit_txbuffer(card);
+	if (card->tx_buffer == NULL) {
+		/* Get new tx buffer */
+		card->tx_buffer = lcs_get_buffer(&card->write);
+		if (card->tx_buffer == NULL) {
+			card->stats.tx_dropped++;
+			rc = NETDEV_TX_BUSY;
+			goto out;
+		}
+		card->tx_buffer->callback = lcs_txbuffer_cb;
+		card->tx_buffer->count = 0;
+	}
+	header = (struct lcs_header *)
+		(card->tx_buffer->data + card->tx_buffer->count);
+	card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
+	header->offset = card->tx_buffer->count;
+	header->type = card->lan_type;
+	header->slot = card->portno;
+	skb_copy_from_linear_data(skb, header + 1, skb->len);
+	spin_unlock(&card->lock);
+	card->stats.tx_bytes += skb->len;
+	card->stats.tx_packets++;
+	dev_kfree_skb(skb);
+	netif_wake_queue(card->dev);
+	spin_lock(&card->lock);
+	if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
+		/* If this is the first tx buffer emit it immediately. */
+		__lcs_emit_txbuffer(card);
+out:
+	spin_unlock(&card->lock);
+	return rc;
+}
+
+static int
+lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct lcs_card *card;
+	int rc;
+
+	LCS_DBF_TEXT(5, trace, "pktxmit");
+	card = (struct lcs_card *) dev->ml_priv;
+	rc = __lcs_start_xmit(card, skb, dev);
+	return rc;
+}
+
+/**
+ * send startlan and lanstat command to make LCS device ready
+ */
+static int
+lcs_startlan_auto(struct lcs_card *card)
+{
+	int rc;
+
+	LCS_DBF_TEXT(2, trace, "strtauto");
+#ifdef CONFIG_ETHERNET
+	card->lan_type = LCS_FRAME_TYPE_ENET;
+	rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
+	if (rc == 0)
+		return 0;
+
+#endif
+#ifdef CONFIG_FDDI
+	card->lan_type = LCS_FRAME_TYPE_FDDI;
+	rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
+	if (rc == 0)
+		return 0;
+#endif
+	return -EIO;
+}
+
+static int
+lcs_startlan(struct lcs_card *card)
+{
+	int rc, i;
+
+	LCS_DBF_TEXT(2, trace, "startlan");
+	rc = 0;
+	if (card->portno != LCS_INVALID_PORT_NO) {
+		if (card->lan_type == LCS_FRAME_TYPE_AUTO)
+			rc = lcs_startlan_auto(card);
+		else
+			rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
+	} else {
+                for (i = 0; i <= 16; i++) {
+                        card->portno = i;
+                        if (card->lan_type != LCS_FRAME_TYPE_AUTO)
+                                rc = lcs_send_startlan(card,
+                                                       LCS_INITIATOR_TCPIP);
+                        else
+                                /* autodetecting lan type */
+                                rc = lcs_startlan_auto(card);
+                        if (rc == 0)
+                                break;
+                }
+        }
+	if (rc == 0)
+		return lcs_send_lanstat(card);
+	return rc;
+}
+
+/**
+ * LCS detect function
+ * setup channels and make them I/O ready
+ */
+static int
+lcs_detect(struct lcs_card *card)
+{
+	int rc = 0;
+
+	LCS_DBF_TEXT(2, setup, "lcsdetct");
+	/* start/reset card */
+	if (card->dev)
+		netif_stop_queue(card->dev);
+	rc = lcs_stop_channels(card);
+	if (rc == 0) {
+		rc = lcs_start_channels(card);
+		if (rc == 0) {
+			rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
+			if (rc == 0)
+				rc = lcs_startlan(card);
+		}
+	}
+	if (rc == 0) {
+		card->state = DEV_STATE_UP;
+	} else {
+		card->state = DEV_STATE_DOWN;
+		card->write.state = LCS_CH_STATE_INIT;
+		card->read.state =  LCS_CH_STATE_INIT;
+	}
+	return rc;
+}
+
+/**
+ * LCS Stop card
+ */
+static int
+lcs_stopcard(struct lcs_card *card)
+{
+	int rc;
+
+	LCS_DBF_TEXT(3, setup, "stopcard");
+
+	if (card->read.state != LCS_CH_STATE_STOPPED &&
+	    card->write.state != LCS_CH_STATE_STOPPED &&
+	    card->read.state != LCS_CH_STATE_ERROR &&
+	    card->write.state != LCS_CH_STATE_ERROR &&
+	    card->state == DEV_STATE_UP) {
+		lcs_clear_multicast_list(card);
+		rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
+		rc = lcs_send_shutdown(card);
+	}
+	rc = lcs_stop_channels(card);
+	card->state = DEV_STATE_DOWN;
+
+	return rc;
+}
+
+/**
+ * Kernel Thread helper functions for LGW initiated commands
+ */
+static void
+lcs_start_kernel_thread(struct work_struct *work)
+{
+	struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
+	LCS_DBF_TEXT(5, trace, "krnthrd");
+	if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
+		kthread_run(lcs_recovery, card, "lcs_recover");
+#ifdef CONFIG_IP_MULTICAST
+	if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
+		kthread_run(lcs_register_mc_addresses, card, "regipm");
+#endif
+}
+
+/**
+ * Process control frames.
+ */
+static void
+lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
+{
+	LCS_DBF_TEXT(5, trace, "getctrl");
+	if (cmd->initiator == LCS_INITIATOR_LGW) {
+		switch(cmd->cmd_code) {
+		case LCS_CMD_STARTUP:
+		case LCS_CMD_STARTLAN:
+			lcs_schedule_recovery(card);
+			break;
+		case LCS_CMD_STOPLAN:
+			if (card->dev) {
+				pr_warn("Stoplan for %s initiated by LGW\n",
+					card->dev->name);
+				netif_carrier_off(card->dev);
+			}
+			break;
+		default:
+			LCS_DBF_TEXT(5, trace, "noLGWcmd");
+			break;
+		}
+	} else
+		lcs_notify_lancmd_waiters(card, cmd);
+}
+
+/**
+ * Unpack network packet.
+ */
+static void
+lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
+{
+	struct sk_buff *skb;
+
+	LCS_DBF_TEXT(5, trace, "getskb");
+	if (card->dev == NULL ||
+	    card->state != DEV_STATE_UP)
+		/* The card isn't up. Ignore the packet. */
+		return;
+
+	skb = dev_alloc_skb(skb_len);
+	if (skb == NULL) {
+		dev_err(&card->dev->dev,
+			" Allocating a socket buffer to interface %s failed\n",
+			  card->dev->name);
+		card->stats.rx_dropped++;
+		return;
+	}
+	skb_put_data(skb, skb_data, skb_len);
+	skb->protocol =	card->lan_type_trans(skb, card->dev);
+	card->stats.rx_bytes += skb_len;
+	card->stats.rx_packets++;
+	if (skb->protocol == htons(ETH_P_802_2))
+		*((__u32 *)skb->cb) = ++card->pkt_seq;
+	netif_rx(skb);
+}
+
+/**
+ * LCS main routine to get packets and lancmd replies from the buffers
+ */
+static void
+lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
+{
+	struct lcs_card *card;
+	struct lcs_header *lcs_hdr;
+	__u16 offset;
+
+	LCS_DBF_TEXT(5, trace, "lcsgtpkt");
+	lcs_hdr = (struct lcs_header *) buffer->data;
+	if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
+		LCS_DBF_TEXT(4, trace, "-eiogpkt");
+		return;
+	}
+	card = container_of(channel, struct lcs_card, read);
+	offset = 0;
+	while (lcs_hdr->offset != 0) {
+		if (lcs_hdr->offset <= 0 ||
+		    lcs_hdr->offset > LCS_IOBUFFERSIZE ||
+		    lcs_hdr->offset < offset) {
+			/* Offset invalid. */
+			card->stats.rx_length_errors++;
+			card->stats.rx_errors++;
+			return;
+		}
+		/* What kind of frame is it? */
+		if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
+			/* Control frame. */
+			lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
+		else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
+			 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
+			 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
+			/* Normal network packet. */
+			lcs_get_skb(card, (char *)(lcs_hdr + 1),
+				    lcs_hdr->offset - offset -
+				    sizeof(struct lcs_header));
+		else
+			/* Unknown frame type. */
+			; // FIXME: error message ?
+		/* Proceed to next frame. */
+		offset = lcs_hdr->offset;
+		lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
+		lcs_hdr = (struct lcs_header *) (buffer->data + offset);
+	}
+	/* The buffer is now empty. Make it ready again. */
+	lcs_ready_buffer(&card->read, buffer);
+}
+
+/**
+ * get network statistics for ifconfig and other user programs
+ */
+static struct net_device_stats *
+lcs_getstats(struct net_device *dev)
+{
+	struct lcs_card *card;
+
+	LCS_DBF_TEXT(4, trace, "netstats");
+	card = (struct lcs_card *) dev->ml_priv;
+	return &card->stats;
+}
+
+/**
+ * stop lcs device
+ * This function will be called by user doing ifconfig xxx down
+ */
+static int
+lcs_stop_device(struct net_device *dev)
+{
+	struct lcs_card *card;
+	int rc;
+
+	LCS_DBF_TEXT(2, trace, "stopdev");
+	card   = (struct lcs_card *) dev->ml_priv;
+	netif_carrier_off(dev);
+	netif_tx_disable(dev);
+	dev->flags &= ~IFF_UP;
+	wait_event(card->write.wait_q,
+		(card->write.state != LCS_CH_STATE_RUNNING));
+	rc = lcs_stopcard(card);
+	if (rc)
+		dev_err(&card->dev->dev,
+			" Shutting down the LCS device failed\n");
+	return rc;
+}
+
+/**
+ * start lcs device and make it runnable
+ * This function will be called by user doing ifconfig xxx up
+ */
+static int
+lcs_open_device(struct net_device *dev)
+{
+	struct lcs_card *card;
+	int rc;
+
+	LCS_DBF_TEXT(2, trace, "opendev");
+	card = (struct lcs_card *) dev->ml_priv;
+	/* initialize statistics */
+	rc = lcs_detect(card);
+	if (rc) {
+		pr_err("Error in opening device!\n");
+
+	} else {
+		dev->flags |= IFF_UP;
+		netif_carrier_on(dev);
+		netif_wake_queue(dev);
+		card->state = DEV_STATE_UP;
+	}
+	return rc;
+}
+
+/**
+ * show function for portno called by cat or similar things
+ */
+static ssize_t
+lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct lcs_card *card;
+
+	card = dev_get_drvdata(dev);
+
+        if (!card)
+                return 0;
+
+        return sprintf(buf, "%d\n", card->portno);
+}
+
+/**
+ * store the value which is piped to file portno
+ */
+static ssize_t
+lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct lcs_card *card;
+	int rc;
+	s16 value;
+
+	card = dev_get_drvdata(dev);
+
+        if (!card)
+                return 0;
+
+	rc = kstrtos16(buf, 0, &value);
+	if (rc)
+		return -EINVAL;
+        /* TODO: sanity checks */
+        card->portno = value;
+	if (card->dev)
+		card->dev->dev_port = card->portno;
+
+        return count;
+
+}
+
+static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
+
+static const char *lcs_type[] = {
+	"not a channel",
+	"2216 parallel",
+	"2216 channel",
+	"OSA LCS card",
+	"unknown channel type",
+	"unsupported channel type",
+};
+
+static ssize_t
+lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct ccwgroup_device *cgdev;
+
+	cgdev = to_ccwgroupdev(dev);
+	if (!cgdev)
+		return -ENODEV;
+
+	return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
+}
+
+static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
+
+static ssize_t
+lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct lcs_card *card;
+
+	card = dev_get_drvdata(dev);
+
+	return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
+}
+
+static ssize_t
+lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct lcs_card *card;
+	unsigned int value;
+	int rc;
+
+	card = dev_get_drvdata(dev);
+
+        if (!card)
+                return 0;
+
+	rc = kstrtouint(buf, 0, &value);
+	if (rc)
+		return -EINVAL;
+        /* TODO: sanity checks */
+        card->lancmd_timeout = value;
+
+        return count;
+
+}
+
+static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
+
+static ssize_t
+lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
+		      const char *buf, size_t count)
+{
+	struct lcs_card *card = dev_get_drvdata(dev);
+	char *tmp;
+	int i;
+
+	if (!card)
+		return -EINVAL;
+	if (card->state != DEV_STATE_UP)
+		return -EPERM;
+	i = simple_strtoul(buf, &tmp, 16);
+	if (i == 1)
+		lcs_schedule_recovery(card);
+	return count;
+}
+
+static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
+
+static struct attribute * lcs_attrs[] = {
+	&dev_attr_portno.attr,
+	&dev_attr_type.attr,
+	&dev_attr_lancmd_timeout.attr,
+	&dev_attr_recover.attr,
+	NULL,
+};
+static struct attribute_group lcs_attr_group = {
+	.attrs = lcs_attrs,
+};
+static const struct attribute_group *lcs_attr_groups[] = {
+	&lcs_attr_group,
+	NULL,
+};
+static const struct device_type lcs_devtype = {
+	.name = "lcs",
+	.groups = lcs_attr_groups,
+};
+
+/**
+ * lcs_probe_device is called on establishing a new ccwgroup_device.
+ */
+static int
+lcs_probe_device(struct ccwgroup_device *ccwgdev)
+{
+	struct lcs_card *card;
+
+	if (!get_device(&ccwgdev->dev))
+		return -ENODEV;
+
+	LCS_DBF_TEXT(2, setup, "add_dev");
+        card = lcs_alloc_card();
+        if (!card) {
+		LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
+		put_device(&ccwgdev->dev);
+                return -ENOMEM;
+        }
+	dev_set_drvdata(&ccwgdev->dev, card);
+	ccwgdev->cdev[0]->handler = lcs_irq;
+	ccwgdev->cdev[1]->handler = lcs_irq;
+	card->gdev = ccwgdev;
+	INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
+	card->thread_start_mask = 0;
+	card->thread_allowed_mask = 0;
+	card->thread_running_mask = 0;
+	ccwgdev->dev.type = &lcs_devtype;
+
+	return 0;
+}
+
+static int
+lcs_register_netdev(struct ccwgroup_device *ccwgdev)
+{
+	struct lcs_card *card;
+
+	LCS_DBF_TEXT(2, setup, "regnetdv");
+	card = dev_get_drvdata(&ccwgdev->dev);
+	if (card->dev->reg_state != NETREG_UNINITIALIZED)
+		return 0;
+	SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
+	return register_netdev(card->dev);
+}
+
+/**
+ * lcs_new_device will be called by setting the group device online.
+ */
+static const struct net_device_ops lcs_netdev_ops = {
+	.ndo_open		= lcs_open_device,
+	.ndo_stop		= lcs_stop_device,
+	.ndo_get_stats		= lcs_getstats,
+	.ndo_start_xmit		= lcs_start_xmit,
+};
+
+static const struct net_device_ops lcs_mc_netdev_ops = {
+	.ndo_open		= lcs_open_device,
+	.ndo_stop		= lcs_stop_device,
+	.ndo_get_stats		= lcs_getstats,
+	.ndo_start_xmit		= lcs_start_xmit,
+	.ndo_set_rx_mode	= lcs_set_multicast_list,
+};
+
+static int
+lcs_new_device(struct ccwgroup_device *ccwgdev)
+{
+	struct  lcs_card *card;
+	struct net_device *dev=NULL;
+	enum lcs_dev_states recover_state;
+	int rc;
+
+	card = dev_get_drvdata(&ccwgdev->dev);
+	if (!card)
+		return -ENODEV;
+
+	LCS_DBF_TEXT(2, setup, "newdev");
+	LCS_DBF_HEX(3, setup, &card, sizeof(void*));
+	card->read.ccwdev  = ccwgdev->cdev[0];
+	card->write.ccwdev = ccwgdev->cdev[1];
+
+	recover_state = card->state;
+	rc = ccw_device_set_online(card->read.ccwdev);
+	if (rc)
+		goto out_err;
+	rc = ccw_device_set_online(card->write.ccwdev);
+	if (rc)
+		goto out_werr;
+
+	LCS_DBF_TEXT(3, setup, "lcsnewdv");
+
+	lcs_setup_card(card);
+	rc = lcs_detect(card);
+	if (rc) {
+		LCS_DBF_TEXT(2, setup, "dtctfail");
+		dev_err(&ccwgdev->dev,
+			"Detecting a network adapter for LCS devices"
+			" failed with rc=%d (0x%x)\n", rc, rc);
+		lcs_stopcard(card);
+		goto out;
+	}
+	if (card->dev) {
+		LCS_DBF_TEXT(2, setup, "samedev");
+		LCS_DBF_HEX(3, setup, &card, sizeof(void*));
+		goto netdev_out;
+	}
+	switch (card->lan_type) {
+#ifdef CONFIG_ETHERNET
+	case LCS_FRAME_TYPE_ENET:
+		card->lan_type_trans = eth_type_trans;
+		dev = alloc_etherdev(0);
+		break;
+#endif
+#ifdef CONFIG_FDDI
+	case LCS_FRAME_TYPE_FDDI:
+		card->lan_type_trans = fddi_type_trans;
+		dev = alloc_fddidev(0);
+		break;
+#endif
+	default:
+		LCS_DBF_TEXT(3, setup, "errinit");
+		pr_err(" Initialization failed\n");
+		goto out;
+	}
+	if (!dev)
+		goto out;
+	card->dev = dev;
+	card->dev->ml_priv = card;
+	card->dev->netdev_ops = &lcs_netdev_ops;
+	card->dev->dev_port = card->portno;
+	memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
+#ifdef CONFIG_IP_MULTICAST
+	if (!lcs_check_multicast_support(card))
+		card->dev->netdev_ops = &lcs_mc_netdev_ops;
+#endif
+netdev_out:
+	lcs_set_allowed_threads(card,0xffffffff);
+	if (recover_state == DEV_STATE_RECOVER) {
+		lcs_set_multicast_list(card->dev);
+		card->dev->flags |= IFF_UP;
+		netif_carrier_on(card->dev);
+		netif_wake_queue(card->dev);
+		card->state = DEV_STATE_UP;
+	} else {
+		lcs_stopcard(card);
+	}
+
+	if (lcs_register_netdev(ccwgdev) != 0)
+		goto out;
+
+	/* Print out supported assists: IPv6 */
+	pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
+		(card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
+		"with" : "without");
+	/* Print out supported assist: Multicast */
+	pr_info("LCS device %s %s Multicast support\n", card->dev->name,
+		(card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
+		"with" : "without");
+	return 0;
+out:
+
+	ccw_device_set_offline(card->write.ccwdev);
+out_werr:
+	ccw_device_set_offline(card->read.ccwdev);
+out_err:
+	return -ENODEV;
+}
+
+/**
+ * lcs_shutdown_device, called when setting the group device offline.
+ */
+static int
+__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
+{
+	struct lcs_card *card;
+	enum lcs_dev_states recover_state;
+	int ret = 0, ret2 = 0, ret3 = 0;
+
+	LCS_DBF_TEXT(3, setup, "shtdndev");
+	card = dev_get_drvdata(&ccwgdev->dev);
+	if (!card)
+		return -ENODEV;
+	if (recovery_mode == 0) {
+		lcs_set_allowed_threads(card, 0);
+		if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
+			return -ERESTARTSYS;
+	}
+	LCS_DBF_HEX(3, setup, &card, sizeof(void*));
+	recover_state = card->state;
+
+	ret = lcs_stop_device(card->dev);
+	ret2 = ccw_device_set_offline(card->read.ccwdev);
+	ret3 = ccw_device_set_offline(card->write.ccwdev);
+	if (!ret)
+		ret = (ret2) ? ret2 : ret3;
+	if (ret)
+		LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
+	if (recover_state == DEV_STATE_UP) {
+		card->state = DEV_STATE_RECOVER;
+	}
+	return 0;
+}
+
+static int
+lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
+{
+	return __lcs_shutdown_device(ccwgdev, 0);
+}
+
+/**
+ * drive lcs recovery after startup and startlan initiated by Lan Gateway
+ */
+static int
+lcs_recovery(void *ptr)
+{
+	struct lcs_card *card;
+	struct ccwgroup_device *gdev;
+        int rc;
+
+	card = (struct lcs_card *) ptr;
+
+	LCS_DBF_TEXT(4, trace, "recover1");
+	if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
+		return 0;
+	LCS_DBF_TEXT(4, trace, "recover2");
+	gdev = card->gdev;
+	dev_warn(&gdev->dev,
+		"A recovery process has been started for the LCS device\n");
+	rc = __lcs_shutdown_device(gdev, 1);
+	rc = lcs_new_device(gdev);
+	if (!rc)
+		pr_info("Device %s successfully recovered!\n",
+			card->dev->name);
+	else
+		pr_info("Device %s could not be recovered!\n",
+			card->dev->name);
+	lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
+	return 0;
+}
+
+/**
+ * lcs_remove_device, free buffers and card
+ */
+static void
+lcs_remove_device(struct ccwgroup_device *ccwgdev)
+{
+	struct lcs_card *card;
+
+	card = dev_get_drvdata(&ccwgdev->dev);
+	if (!card)
+		return;
+
+	LCS_DBF_TEXT(3, setup, "remdev");
+	LCS_DBF_HEX(3, setup, &card, sizeof(void*));
+	if (ccwgdev->state == CCWGROUP_ONLINE) {
+		lcs_shutdown_device(ccwgdev);
+	}
+	if (card->dev)
+		unregister_netdev(card->dev);
+	lcs_cleanup_card(card);
+	lcs_free_card(card);
+	dev_set_drvdata(&ccwgdev->dev, NULL);
+	put_device(&ccwgdev->dev);
+}
+
+static int lcs_pm_suspend(struct lcs_card *card)
+{
+	if (card->dev)
+		netif_device_detach(card->dev);
+	lcs_set_allowed_threads(card, 0);
+	lcs_wait_for_threads(card, 0xffffffff);
+	if (card->state != DEV_STATE_DOWN)
+		__lcs_shutdown_device(card->gdev, 1);
+	return 0;
+}
+
+static int lcs_pm_resume(struct lcs_card *card)
+{
+	int rc = 0;
+
+	if (card->state == DEV_STATE_RECOVER)
+		rc = lcs_new_device(card->gdev);
+	if (card->dev)
+		netif_device_attach(card->dev);
+	if (rc) {
+		dev_warn(&card->gdev->dev, "The lcs device driver "
+			"failed to recover the device\n");
+	}
+	return rc;
+}
+
+static int lcs_prepare(struct ccwgroup_device *gdev)
+{
+	return 0;
+}
+
+static void lcs_complete(struct ccwgroup_device *gdev)
+{
+	return;
+}
+
+static int lcs_freeze(struct ccwgroup_device *gdev)
+{
+	struct lcs_card *card = dev_get_drvdata(&gdev->dev);
+	return lcs_pm_suspend(card);
+}
+
+static int lcs_thaw(struct ccwgroup_device *gdev)
+{
+	struct lcs_card *card = dev_get_drvdata(&gdev->dev);
+	return lcs_pm_resume(card);
+}
+
+static int lcs_restore(struct ccwgroup_device *gdev)
+{
+	struct lcs_card *card = dev_get_drvdata(&gdev->dev);
+	return lcs_pm_resume(card);
+}
+
+static struct ccw_device_id lcs_ids[] = {
+	{CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
+	{CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
+	{CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
+	{},
+};
+MODULE_DEVICE_TABLE(ccw, lcs_ids);
+
+static struct ccw_driver lcs_ccw_driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= "lcs",
+	},
+	.ids	= lcs_ids,
+	.probe	= ccwgroup_probe_ccwdev,
+	.remove	= ccwgroup_remove_ccwdev,
+	.int_class = IRQIO_LCS,
+};
+
+/**
+ * LCS ccwgroup driver registration
+ */
+static struct ccwgroup_driver lcs_group_driver = {
+	.driver = {
+		.owner	= THIS_MODULE,
+		.name	= "lcs",
+	},
+	.ccw_driver  = &lcs_ccw_driver,
+	.setup	     = lcs_probe_device,
+	.remove      = lcs_remove_device,
+	.set_online  = lcs_new_device,
+	.set_offline = lcs_shutdown_device,
+	.prepare     = lcs_prepare,
+	.complete    = lcs_complete,
+	.freeze	     = lcs_freeze,
+	.thaw	     = lcs_thaw,
+	.restore     = lcs_restore,
+};
+
+static ssize_t group_store(struct device_driver *ddrv, const char *buf,
+			   size_t count)
+{
+	int err;
+	err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
+	return err ? err : count;
+}
+static DRIVER_ATTR_WO(group);
+
+static struct attribute *lcs_drv_attrs[] = {
+	&driver_attr_group.attr,
+	NULL,
+};
+static struct attribute_group lcs_drv_attr_group = {
+	.attrs = lcs_drv_attrs,
+};
+static const struct attribute_group *lcs_drv_attr_groups[] = {
+	&lcs_drv_attr_group,
+	NULL,
+};
+
+/**
+ *  LCS Module/Kernel initialization function
+ */
+static int
+__init lcs_init_module(void)
+{
+	int rc;
+
+	pr_info("Loading %s\n", version);
+	rc = lcs_register_debug_facility();
+	LCS_DBF_TEXT(0, setup, "lcsinit");
+	if (rc)
+		goto out_err;
+	lcs_root_dev = root_device_register("lcs");
+	rc = PTR_ERR_OR_ZERO(lcs_root_dev);
+	if (rc)
+		goto register_err;
+	rc = ccw_driver_register(&lcs_ccw_driver);
+	if (rc)
+		goto ccw_err;
+	lcs_group_driver.driver.groups = lcs_drv_attr_groups;
+	rc = ccwgroup_driver_register(&lcs_group_driver);
+	if (rc)
+		goto ccwgroup_err;
+	return 0;
+
+ccwgroup_err:
+	ccw_driver_unregister(&lcs_ccw_driver);
+ccw_err:
+	root_device_unregister(lcs_root_dev);
+register_err:
+	lcs_unregister_debug_facility();
+out_err:
+	pr_err("Initializing the lcs device driver failed\n");
+	return rc;
+}
+
+
+/**
+ *  LCS module cleanup function
+ */
+static void
+__exit lcs_cleanup_module(void)
+{
+	pr_info("Terminating lcs module.\n");
+	LCS_DBF_TEXT(0, trace, "cleanup");
+	ccwgroup_driver_unregister(&lcs_group_driver);
+	ccw_driver_unregister(&lcs_ccw_driver);
+	root_device_unregister(lcs_root_dev);
+	lcs_unregister_debug_facility();
+}
+
+module_init(lcs_init_module);
+module_exit(lcs_cleanup_module);
+
+MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
+MODULE_LICENSE("GPL");
+