lcs.c

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/*
 *  Linux for S/390 Lan Channel Station Network Driver
 *
 *  Copyright IBM Corp. 1999, 2009
 *  Author(s): Original Code written by
 *          DJ Barrow <[email protected],[email protected]>
 *         Rewritten by
 *          Frank Pavlic <[email protected]> and
 *          Martin Schwidefsky <[email protected]>
 *
 * 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, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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

static char version[] __initdata = "LCS driver";

static struct device *lcs_root_dev;

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);

static char debug_buffer[255];
static debug_info_t *lcs_dbf_setup;
static debug_info_t *lcs_dbf_trace;

static void
lcs_unregister_debug_facility(void)
{
    if (lcs_dbf_setup)
        debug_unregister(lcs_dbf_setup);
    if (lcs_dbf_trace)
        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;
}

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;
}

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);
}

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);
}

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 inline 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 inline 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 inline 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;
}

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 inline 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
}
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);
}

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;
}


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;
}

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;
}

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;
}

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;
}

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;

}

static inline 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;
}

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);
}

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);
}

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)
{
    WARN_ON(atomic_read(&reply->refcnt) <= 0);
    atomic_inc(&reply->refcnt);
}

static void
lcs_put_reply(struct lcs_reply *reply)
{
        WARN_ON(atomic_read(&reply->refcnt) <= 0);
        if (atomic_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;
    atomic_set(&reply->refcnt,1);
    reply->sequence_no = cmd->sequence_no;
    reply->received = 0;
    reply->rc = 0;
    init_waitqueue_head(&reply->wait_q);

    return reply;
}

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);
}

static void
lcs_lancmd_timeout(unsigned long data)
{
    struct lcs_reply *reply, *list_reply, *r;
    unsigned long flags;

    LCS_DBF_TEXT(4, trace, "timeout");
    reply = (struct lcs_reply *) data;
    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;
    struct timer_list timer;
    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;
    init_timer_on_stack(&timer);
    timer.function = lcs_lancmd_timeout;
    timer.data = (unsigned long) reply;
    timer.expires = jiffies + HZ*card->lancmd_timeout;
    add_timer(&timer);
    wait_event(reply->wait_q, reply->received);
    del_timer_sync(&timer);
    LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
    rc = reply->rc;
    lcs_put_reply(reply);
    return rc ? -EIO : 0;
}

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);
}

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);
}

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);
}

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);
}

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

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);
}

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);
}

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;
}

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);
}

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);
}

static inline 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 inline 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 inline 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 */

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);
}

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);
}

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);
}

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++;
}

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);
}

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;
}

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;
}

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;
}

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;
}

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
}

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:
            pr_warning("Stoplan for %s initiated by LGW.\n",
                   card->dev->name);
            if (card->dev)
                netif_carrier_off(card->dev);
            break;
        default:
            LCS_DBF_TEXT(5, trace, "noLGWcmd");
            break;
        }
    } else
        lcs_notify_lancmd_waiters(card, cmd);
}

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;
    }
    memcpy(skb_put(skb, skb_len), 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);
}

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);
}

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;
}

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;
}

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;
}

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);
}

static ssize_t
lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
        struct lcs_card *card;
        int value;

    card = dev_get_drvdata(dev);

        if (!card)
                return 0;

        sscanf(buf, "%u", &value);
        /* TODO: sanity checks */
        card->portno = value;

        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;
        int value;

    card = dev_get_drvdata(dev);

        if (!card)
                return 0;

        sscanf(buf, "%u", &value);
        /* 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,
};

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);
}

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(&card->dev->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;
    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;
}

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);
}

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;
}

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 = IOINT_LCS,
};

static struct ccwgroup_driver lcs_group_driver = {
    .driver = {
        .owner  = THIS_MODULE,
        .name   = "lcs",
    },
    .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 lcs_driver_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(group, 0200, NULL, lcs_driver_group_store);

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,
};

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 = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
    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;
}


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 <[email protected]>");
MODULE_LICENSE("GPL");