/*
 *
 * hfcpci.c     low level driver for CCD's hfc-pci based cards
 *
 * Author     Werner Cornelius (werner@isdn4linux.de)
 *            based on existing driver for CCD hfc ISA cards
 *            type approval valid for HFC-S PCI A based card
 *
 * Copyright 1999  by Werner Cornelius (werner@isdn-development.de)
 * Copyright 2008  by Karsten Keil <kkeil@novell.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, 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.
 *
 * Module options:
 *
 * debug:
 *      NOTE: only one poll value must be given for all cards
 *      See hfc_pci.h for debug flags.
 *
 * poll:
 *      NOTE: only one poll value must be given for all cards
 *      Give the number of samples for each fifo process.
 *      By default 128 is used. Decrease to reduce delay, increase to
 *      reduce cpu load. If unsure, don't mess with it!
 *      A value of 128 will use controller's interrupt. Other values will
 *      use kernel timer, because the controller will not allow lower values
 *      than 128.
 *      Also note that the value depends on the kernel timer frequency.
 *      If kernel uses a frequency of 1000 Hz, steps of 8 samples are possible.
 *      If the kernel uses 100 Hz, steps of 80 samples are possible.
 *      If the kernel uses 300 Hz, steps of about 26 samples are possible.
 *
 */

#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/mISDNhw.h>
#include <linux/slab.h>

#include "hfc_pci.h"

static const char *hfcpci_revision = "2.0";

static int HFC_cnt;
static uint debug;
static uint poll, tics;
static struct timer_list hfc_tl;
static unsigned long hfc_jiffies;

MODULE_AUTHOR("Karsten Keil");
MODULE_LICENSE("GPL");
module_param(debug, uint, S_IRUGO | S_IWUSR);
module_param(poll, uint, S_IRUGO | S_IWUSR);

enum {
        HFC_CCD_2BD0,
        HFC_CCD_B000,
        HFC_CCD_B006,
        HFC_CCD_B007,
        HFC_CCD_B008,
        HFC_CCD_B009,
        HFC_CCD_B00A,
        HFC_CCD_B00B,
        HFC_CCD_B00C,
        HFC_CCD_B100,
        HFC_CCD_B700,
        HFC_CCD_B701,
        HFC_ASUS_0675,
        HFC_BERKOM_A1T,
        HFC_BERKOM_TCONCEPT,
        HFC_ANIGMA_MC145575,
        HFC_ZOLTRIX_2BD0,
        HFC_DIGI_DF_M_IOM2_E,
        HFC_DIGI_DF_M_E,
        HFC_DIGI_DF_M_IOM2_A,
        HFC_DIGI_DF_M_A,
        HFC_ABOCOM_2BD1,
        HFC_SITECOM_DC105V2,
};

struct hfcPCI_hw {
        unsigned char           cirm;
        unsigned char           ctmt;
        unsigned char           clkdel;
        unsigned char           states;
        unsigned char           conn;
        unsigned char           mst_m;
        unsigned char           int_m1;
        unsigned char           int_m2;
        unsigned char           sctrl;
        unsigned char           sctrl_r;
        unsigned char           sctrl_e;
        unsigned char           trm;
        unsigned char           fifo_en;
        unsigned char           bswapped;
        unsigned char           protocol;
        int                     nt_timer;
        unsigned char __iomem   *pci_io; /* start of PCI IO memory */
        dma_addr_t              dmahandle;
        void                    *fifos; /* FIFO memory */
        int                     last_bfifo_cnt[2];
        /* marker saving last b-fifo frame count */
        struct timer_list       timer;
};

#define HFC_CFG_MASTER          1
#define HFC_CFG_SLAVE           2
#define HFC_CFG_PCM             3
#define HFC_CFG_2HFC            4
#define HFC_CFG_SLAVEHFC        5
#define HFC_CFG_NEG_F0          6
#define HFC_CFG_SW_DD_DU        7

#define FLG_HFC_TIMER_T1        16
#define FLG_HFC_TIMER_T3        17

#define NT_T1_COUNT     1120    /* number of 3.125ms interrupts (3.5s) */
#define NT_T3_COUNT     31      /* number of 3.125ms interrupts (97 ms) */
#define CLKDEL_TE       0x0e    /* CLKDEL in TE mode */
#define CLKDEL_NT       0x6c    /* CLKDEL in NT mode */


struct hfc_pci {
        u_char                  subtype;
        u_char                  chanlimit;
        u_char                  initdone;
        u_long                  cfg;
        u_int                   irq;
        u_int                   irqcnt;
        struct pci_dev          *pdev;
        struct hfcPCI_hw        hw;
        spinlock_t              lock;   /* card lock */
        struct dchannel         dch;
        struct bchannel         bch[2];
};

/* Interface functions */
static void
enable_hwirq(struct hfc_pci *hc)
{
        hc->hw.int_m2 |= HFCPCI_IRQ_ENABLE;
        Write_hfc(hc, HFCPCI_INT_M2, hc->hw.int_m2);
}

static void
disable_hwirq(struct hfc_pci *hc)
{
        hc->hw.int_m2 &= ~((u_char)HFCPCI_IRQ_ENABLE);
        Write_hfc(hc, HFCPCI_INT_M2, hc->hw.int_m2);
}

/*
 * free hardware resources used by driver
 */
static void
release_io_hfcpci(struct hfc_pci *hc)
{
        /* disable memory mapped ports + busmaster */
        pci_write_config_word(hc->pdev, PCI_COMMAND, 0);
        del_timer(&hc->hw.timer);
        pci_free_consistent(hc->pdev, 0x8000, hc->hw.fifos, hc->hw.dmahandle);
        iounmap(hc->hw.pci_io);
}

/*
 * set mode (NT or TE)
 */
static void
hfcpci_setmode(struct hfc_pci *hc)
{
        if (hc->hw.protocol == ISDN_P_NT_S0) {
                hc->hw.clkdel = CLKDEL_NT;      /* ST-Bit delay for NT-Mode */
                hc->hw.sctrl |= SCTRL_MODE_NT;  /* NT-MODE */
                hc->hw.states = 1;              /* G1 */
        } else {
                hc->hw.clkdel = CLKDEL_TE;      /* ST-Bit delay for TE-Mode */
                hc->hw.sctrl &= ~SCTRL_MODE_NT; /* TE-MODE */
                hc->hw.states = 2;              /* F2 */
        }
        Write_hfc(hc, HFCPCI_CLKDEL, hc->hw.clkdel);
        Write_hfc(hc, HFCPCI_STATES, HFCPCI_LOAD_STATE | hc->hw.states);
        udelay(10);
        Write_hfc(hc, HFCPCI_STATES, hc->hw.states | 0x40); /* Deactivate */
        Write_hfc(hc, HFCPCI_SCTRL, hc->hw.sctrl);
}

/*
 * function called to reset the HFC PCI chip. A complete software reset of chip
 * and fifos is done.
 */
static void
reset_hfcpci(struct hfc_pci *hc)
{
        u_char  val;
        int     cnt = 0;

        printk(KERN_DEBUG "reset_hfcpci: entered\n");
        val = Read_hfc(hc, HFCPCI_CHIP_ID);
        printk(KERN_INFO "HFC_PCI: resetting HFC ChipId(%x)\n", val);
        /* enable memory mapped ports, disable busmaster */
        pci_write_config_word(hc->pdev, PCI_COMMAND, PCI_ENA_MEMIO);
        disable_hwirq(hc);
        /* enable memory ports + busmaster */
        pci_write_config_word(hc->pdev, PCI_COMMAND,
                              PCI_ENA_MEMIO + PCI_ENA_MASTER);
        val = Read_hfc(hc, HFCPCI_STATUS);
        printk(KERN_DEBUG "HFC-PCI status(%x) before reset\n", val);
        hc->hw.cirm = HFCPCI_RESET;     /* Reset On */
        Write_hfc(hc, HFCPCI_CIRM, hc->hw.cirm);
        set_current_state(TASK_UNINTERRUPTIBLE);
        mdelay(10);                     /* Timeout 10ms */
        hc->hw.cirm = 0;                /* Reset Off */
        Write_hfc(hc, HFCPCI_CIRM, hc->hw.cirm);
        val = Read_hfc(hc, HFCPCI_STATUS);
        printk(KERN_DEBUG "HFC-PCI status(%x) after reset\n", val);
        while (cnt < 50000) { /* max 50000 us */
                udelay(5);
                cnt += 5;
                val = Read_hfc(hc, HFCPCI_STATUS);
                if (!(val & 2))
                        break;
        }
        printk(KERN_DEBUG "HFC-PCI status(%x) after %dus\n", val, cnt);

        hc->hw.fifo_en = 0x30;  /* only D fifos enabled */

        hc->hw.bswapped = 0;    /* no exchange */
        hc->hw.ctmt = HFCPCI_TIM3_125 | HFCPCI_AUTO_TIMER;
        hc->hw.trm = HFCPCI_BTRANS_THRESMASK; /* no echo connect , threshold */
        hc->hw.sctrl = 0x40;    /* set tx_lo mode, error in datasheet ! */
        hc->hw.sctrl_r = 0;
        hc->hw.sctrl_e = HFCPCI_AUTO_AWAKE;     /* S/T Auto awake */
        hc->hw.mst_m = 0;
        if (test_bit(HFC_CFG_MASTER, &hc->cfg))
                hc->hw.mst_m |= HFCPCI_MASTER;  /* HFC Master Mode */
        if (test_bit(HFC_CFG_NEG_F0, &hc->cfg))
                hc->hw.mst_m |= HFCPCI_F0_NEGATIV;
        Write_hfc(hc, HFCPCI_FIFO_EN, hc->hw.fifo_en);
        Write_hfc(hc, HFCPCI_TRM, hc->hw.trm);
        Write_hfc(hc, HFCPCI_SCTRL_E, hc->hw.sctrl_e);
        Write_hfc(hc, HFCPCI_CTMT, hc->hw.ctmt);

        hc->hw.int_m1 = HFCPCI_INTS_DTRANS | HFCPCI_INTS_DREC |
                HFCPCI_INTS_L1STATE | HFCPCI_INTS_TIMER;
        Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);

        /* Clear already pending ints */
        val = Read_hfc(hc, HFCPCI_INT_S1);

        /* set NT/TE mode */
        hfcpci_setmode(hc);

        Write_hfc(hc, HFCPCI_MST_MODE, hc->hw.mst_m);
        Write_hfc(hc, HFCPCI_SCTRL_R, hc->hw.sctrl_r);

        /*
         * Init GCI/IOM2 in master mode
         * Slots 0 and 1 are set for B-chan 1 and 2
         * D- and monitor/CI channel are not enabled
         * STIO1 is used as output for data, B1+B2 from ST->IOM+HFC
         * STIO2 is used as data input, B1+B2 from IOM->ST
         * ST B-channel send disabled -> continuous 1s
         * The IOM slots are always enabled
         */
        if (test_bit(HFC_CFG_PCM, &hc->cfg)) {
                /* set data flow directions: connect B1,B2: HFC to/from PCM */
                hc->hw.conn = 0x09;
        } else {
                hc->hw.conn = 0x36;     /* set data flow directions */
                if (test_bit(HFC_CFG_SW_DD_DU, &hc->cfg)) {
                        Write_hfc(hc, HFCPCI_B1_SSL, 0xC0);
                        Write_hfc(hc, HFCPCI_B2_SSL, 0xC1);
                        Write_hfc(hc, HFCPCI_B1_RSL, 0xC0);
                        Write_hfc(hc, HFCPCI_B2_RSL, 0xC1);
                } else {
                        Write_hfc(hc, HFCPCI_B1_SSL, 0x80);
                        Write_hfc(hc, HFCPCI_B2_SSL, 0x81);
                        Write_hfc(hc, HFCPCI_B1_RSL, 0x80);
                        Write_hfc(hc, HFCPCI_B2_RSL, 0x81);
                }
        }
        Write_hfc(hc, HFCPCI_CONNECT, hc->hw.conn);
        val = Read_hfc(hc, HFCPCI_INT_S2);
}

/*
 * Timer function called when kernel timer expires
 */
static void
hfcpci_Timer(struct hfc_pci *hc)
{
        hc->hw.timer.expires = jiffies + 75;
        /* WD RESET */
/*
 *      WriteReg(hc, HFCD_DATA, HFCD_CTMT, hc->hw.ctmt | 0x80);
 *      add_timer(&hc->hw.timer);
 */
}


/*
 * select a b-channel entry matching and active
 */
static struct bchannel *
Sel_BCS(struct hfc_pci *hc, int channel)
{
        if (test_bit(FLG_ACTIVE, &hc->bch[0].Flags) &&
            (hc->bch[0].nr & channel))
                return &hc->bch[0];
        else if (test_bit(FLG_ACTIVE, &hc->bch[1].Flags) &&
                 (hc->bch[1].nr & channel))
                return &hc->bch[1];
        else
                return NULL;
}

/*
 * clear the desired B-channel rx fifo
 */
static void
hfcpci_clear_fifo_rx(struct hfc_pci *hc, int fifo)
{
        u_char          fifo_state;
        struct bzfifo   *bzr;

        if (fifo) {
                bzr = &((union fifo_area *)(hc->hw.fifos))->b_chans.rxbz_b2;
                fifo_state = hc->hw.fifo_en & HFCPCI_FIFOEN_B2RX;
        } else {
                bzr = &((union fifo_area *)(hc->hw.fifos))->b_chans.rxbz_b1;
                fifo_state = hc->hw.fifo_en & HFCPCI_FIFOEN_B1RX;
        }
        if (fifo_state)
                hc->hw.fifo_en ^= fifo_state;
        Write_hfc(hc, HFCPCI_FIFO_EN, hc->hw.fifo_en);
        hc->hw.last_bfifo_cnt[fifo] = 0;
        bzr->f1 = MAX_B_FRAMES;
        bzr->f2 = bzr->f1;      /* init F pointers to remain constant */
        bzr->za[MAX_B_FRAMES].z1 = cpu_to_le16(B_FIFO_SIZE + B_SUB_VAL - 1);
        bzr->za[MAX_B_FRAMES].z2 = cpu_to_le16(
                le16_to_cpu(bzr->za[MAX_B_FRAMES].z1));
        if (fifo_state)
                hc->hw.fifo_en |= fifo_state;
        Write_hfc(hc, HFCPCI_FIFO_EN, hc->hw.fifo_en);
}

/*
 * clear the desired B-channel tx fifo
 */
static void hfcpci_clear_fifo_tx(struct hfc_pci *hc, int fifo)
{
        u_char          fifo_state;
        struct bzfifo   *bzt;

        if (fifo) {
                bzt = &((union fifo_area *)(hc->hw.fifos))->b_chans.txbz_b2;
                fifo_state = hc->hw.fifo_en & HFCPCI_FIFOEN_B2TX;
        } else {
                bzt = &((union fifo_area *)(hc->hw.fifos))->b_chans.txbz_b1;
                fifo_state = hc->hw.fifo_en & HFCPCI_FIFOEN_B1TX;
        }
        if (fifo_state)
                hc->hw.fifo_en ^= fifo_state;
        Write_hfc(hc, HFCPCI_FIFO_EN, hc->hw.fifo_en);
        if (hc->bch[fifo].debug & DEBUG_HW_BCHANNEL)
                printk(KERN_DEBUG "hfcpci_clear_fifo_tx%d f1(%x) f2(%x) "
                       "z1(%x) z2(%x) state(%x)\n",
                       fifo, bzt->f1, bzt->f2,
                       le16_to_cpu(bzt->za[MAX_B_FRAMES].z1),
                       le16_to_cpu(bzt->za[MAX_B_FRAMES].z2),
                       fifo_state);
        bzt->f2 = MAX_B_FRAMES;
        bzt->f1 = bzt->f2;      /* init F pointers to remain constant */
        bzt->za[MAX_B_FRAMES].z1 = cpu_to_le16(B_FIFO_SIZE + B_SUB_VAL - 1);
        bzt->za[MAX_B_FRAMES].z2 = cpu_to_le16(B_FIFO_SIZE + B_SUB_VAL - 2);
        if (fifo_state)
                hc->hw.fifo_en |= fifo_state;
        Write_hfc(hc, HFCPCI_FIFO_EN, hc->hw.fifo_en);
        if (hc->bch[fifo].debug & DEBUG_HW_BCHANNEL)
                printk(KERN_DEBUG
                       "hfcpci_clear_fifo_tx%d f1(%x) f2(%x) z1(%x) z2(%x)\n",
                       fifo, bzt->f1, bzt->f2,
                       le16_to_cpu(bzt->za[MAX_B_FRAMES].z1),
                       le16_to_cpu(bzt->za[MAX_B_FRAMES].z2));
}

/*
 * read a complete B-frame out of the buffer
 */
static void
hfcpci_empty_bfifo(struct bchannel *bch, struct bzfifo *bz,
                   u_char *bdata, int count)
{
        u_char          *ptr, *ptr1, new_f2;
        int             maxlen, new_z2;
        struct zt       *zp;

        if ((bch->debug & DEBUG_HW_BCHANNEL) && !(bch->debug & DEBUG_HW_BFIFO))
                printk(KERN_DEBUG "hfcpci_empty_fifo\n");
        zp = &bz->za[bz->f2];   /* point to Z-Regs */
        new_z2 = le16_to_cpu(zp->z2) + count;   /* new position in fifo */
        if (new_z2 >= (B_FIFO_SIZE + B_SUB_VAL))
                new_z2 -= B_FIFO_SIZE;  /* buffer wrap */
        new_f2 = (bz->f2 + 1) & MAX_B_FRAMES;
        if ((count > MAX_DATA_SIZE + 3) || (count < 4) ||
            (*(bdata + (le16_to_cpu(zp->z1) - B_SUB_VAL)))) {
                if (bch->debug & DEBUG_HW)
                        printk(KERN_DEBUG "hfcpci_empty_fifo: incoming packet "
                               "invalid length %d or crc\n", count);
#ifdef ERROR_STATISTIC
                bch->err_inv++;
#endif
                bz->za[new_f2].z2 = cpu_to_le16(new_z2);
                bz->f2 = new_f2;        /* next buffer */
        } else {
                bch->rx_skb = mI_alloc_skb(count - 3, GFP_ATOMIC);
                if (!bch->rx_skb) {
                        printk(KERN_WARNING "HFCPCI: receive out of memory\n");
                        return;
                }
                count -= 3;
                ptr = skb_put(bch->rx_skb, count);

                if (le16_to_cpu(zp->z2) + count <= B_FIFO_SIZE + B_SUB_VAL)
                        maxlen = count;         /* complete transfer */
                else
                        maxlen = B_FIFO_SIZE + B_SUB_VAL -
                                le16_to_cpu(zp->z2);    /* maximum */

                ptr1 = bdata + (le16_to_cpu(zp->z2) - B_SUB_VAL);
                /* start of data */
                memcpy(ptr, ptr1, maxlen);      /* copy data */
                count -= maxlen;

                if (count) {    /* rest remaining */
                        ptr += maxlen;
                        ptr1 = bdata;   /* start of buffer */
                        memcpy(ptr, ptr1, count);       /* rest */
                }
                bz->za[new_f2].z2 = cpu_to_le16(new_z2);
                bz->f2 = new_f2;        /* next buffer */
                recv_Bchannel(bch, MISDN_ID_ANY, false);
        }
}

/*
 * D-channel receive procedure
 */
static int
receive_dmsg(struct hfc_pci *hc)
{
        struct dchannel *dch = &hc->dch;
        int             maxlen;
        int             rcnt, total;
        int             count = 5;
        u_char          *ptr, *ptr1;
        struct dfifo    *df;
        struct zt       *zp;

        df = &((union fifo_area *)(hc->hw.fifos))->d_chan.d_rx;
        while (((df->f1 & D_FREG_MASK) != (df->f2 & D_FREG_MASK)) && count--) {
                zp = &df->za[df->f2 & D_FREG_MASK];
                rcnt = le16_to_cpu(zp->z1) - le16_to_cpu(zp->z2);
                if (rcnt < 0)
                        rcnt += D_FIFO_SIZE;
                rcnt++;
                if (dch->debug & DEBUG_HW_DCHANNEL)
                        printk(KERN_DEBUG
                               "hfcpci recd f1(%d) f2(%d) z1(%x) z2(%x) cnt(%d)\n",
                               df->f1, df->f2,
                               le16_to_cpu(zp->z1),
                               le16_to_cpu(zp->z2),
                               rcnt);

                if ((rcnt > MAX_DFRAME_LEN + 3) || (rcnt < 4) ||
                    (df->data[le16_to_cpu(zp->z1)])) {
                        if (dch->debug & DEBUG_HW)
                                printk(KERN_DEBUG
                                       "empty_fifo hfcpci packet inv. len "
                                       "%d or crc %d\n",
                                       rcnt,
                                       df->data[le16_to_cpu(zp->z1)]);
#ifdef ERROR_STATISTIC
                        cs->err_rx++;
#endif
                        df->f2 = ((df->f2 + 1) & MAX_D_FRAMES) |
                                (MAX_D_FRAMES + 1);     /* next buffer */
                        df->za[df->f2 & D_FREG_MASK].z2 =
                                cpu_to_le16((le16_to_cpu(zp->z2) + rcnt) &
                                            (D_FIFO_SIZE - 1));
                } else {
                        dch->rx_skb = mI_alloc_skb(rcnt - 3, GFP_ATOMIC);
                        if (!dch->rx_skb) {
                                printk(KERN_WARNING
                                       "HFC-PCI: D receive out of memory\n");
                                break;
                        }
                        total = rcnt;
                        rcnt -= 3;
                        ptr = skb_put(dch->rx_skb, rcnt);

                        if (le16_to_cpu(zp->z2) + rcnt <= D_FIFO_SIZE)
                                maxlen = rcnt;  /* complete transfer */
                        else
                                maxlen = D_FIFO_SIZE - le16_to_cpu(zp->z2);
                        /* maximum */

                        ptr1 = df->data + le16_to_cpu(zp->z2);
                        /* start of data */
                        memcpy(ptr, ptr1, maxlen);      /* copy data */
                        rcnt -= maxlen;

                        if (rcnt) {     /* rest remaining */
                                ptr += maxlen;
                                ptr1 = df->data;        /* start of buffer */
                                memcpy(ptr, ptr1, rcnt);        /* rest */
                        }
                        df->f2 = ((df->f2 + 1) & MAX_D_FRAMES) |
                                (MAX_D_FRAMES + 1);     /* next buffer */
                        df->za[df->f2 & D_FREG_MASK].z2 = cpu_to_le16((
                                                                              le16_to_cpu(zp->z2) + total) & (D_FIFO_SIZE - 1));
                        recv_Dchannel(dch);
                }
        }
        return 1;
}

/*
 * check for transparent receive data and read max one 'poll' size if avail
 */
static void
hfcpci_empty_fifo_trans(struct bchannel *bch, struct bzfifo *rxbz,
                        struct bzfifo *txbz, u_char *bdata)
{
        __le16  *z1r, *z2r, *z1t, *z2t;
        int     new_z2, fcnt_rx, fcnt_tx, maxlen;
        u_char  *ptr, *ptr1;

        z1r = &rxbz->za[MAX_B_FRAMES].z1;       /* pointer to z reg */
        z2r = z1r + 1;
        z1t = &txbz->za[MAX_B_FRAMES].z1;
        z2t = z1t + 1;

        fcnt_rx = le16_to_cpu(*z1r) - le16_to_cpu(*z2r);
        if (!fcnt_rx)
                return; /* no data avail */

        if (fcnt_rx <= 0)
                fcnt_rx += B_FIFO_SIZE; /* bytes actually buffered */
        new_z2 = le16_to_cpu(*z2r) + fcnt_rx;   /* new position in fifo */
        if (new_z2 >= (B_FIFO_SIZE + B_SUB_VAL))
                new_z2 -= B_FIFO_SIZE;  /* buffer wrap */

        fcnt_tx = le16_to_cpu(*z2t) - le16_to_cpu(*z1t);
        if (fcnt_tx <= 0)
                fcnt_tx += B_FIFO_SIZE;
        /* fcnt_tx contains available bytes in tx-fifo */
        fcnt_tx = B_FIFO_SIZE - fcnt_tx;
        /* remaining bytes to send (bytes in tx-fifo) */

        if (test_bit(FLG_RX_OFF, &bch->Flags)) {
                bch->dropcnt += fcnt_rx;
                *z2r = cpu_to_le16(new_z2);
                return;
        }
        maxlen = bchannel_get_rxbuf(bch, fcnt_rx);
        if (maxlen < 0) {
                pr_warning("B%d: No bufferspace for %d bytes\n",
                           bch->nr, fcnt_rx);
        } else {
                ptr = skb_put(bch->rx_skb, fcnt_rx);
                if (le16_to_cpu(*z2r) + fcnt_rx <= B_FIFO_SIZE + B_SUB_VAL)
                        maxlen = fcnt_rx;       /* complete transfer */
                else
                        maxlen = B_FIFO_SIZE + B_SUB_VAL - le16_to_cpu(*z2r);
                /* maximum */

                ptr1 = bdata + (le16_to_cpu(*z2r) - B_SUB_VAL);
                /* start of data */
                memcpy(ptr, ptr1, maxlen);      /* copy data */
                fcnt_rx -= maxlen;

                if (fcnt_rx) {  /* rest remaining */
                        ptr += maxlen;
                        ptr1 = bdata;   /* start of buffer */
                        memcpy(ptr, ptr1, fcnt_rx);     /* rest */
                }
                recv_Bchannel(bch, fcnt_tx, false); /* bch, id, !force */
        }
        *z2r = cpu_to_le16(new_z2);             /* new position */
}

/*
 * B-channel main receive routine
 */
static void
main_rec_hfcpci(struct bchannel *bch)
{
        struct hfc_pci  *hc = bch->hw;
        int             rcnt, real_fifo;
        int             receive = 0, count = 5;
        struct bzfifo   *txbz, *rxbz;
        u_char          *bdata;
        struct zt       *zp;

        if ((bch->nr & 2) && (!hc->hw.bswapped)) {
                rxbz = &((union fifo_area *)(hc->hw.fifos))->b_chans.rxbz_b2;
                txbz = &((union fifo_area *)(hc->hw.fifos))->b_chans.txbz_b2;
                bdata = ((union fifo_area *)(hc->hw.fifos))->b_chans.rxdat_b2;
                real_fifo = 1;
        } else {
                rxbz = &((union fifo_area *)(hc->hw.fifos))->b_chans.rxbz_b1;
                txbz = &((union fifo_area *)(hc->hw.fifos))->b_chans.txbz_b1;
                bdata = ((union fifo_area *)(hc->hw.fifos))->b_chans.rxdat_b1;
                real_fifo = 0;
        }
Begin:
        count--;
        if (rxbz->f1 != rxbz->f2) {
                if (bch->debug & DEBUG_HW_BCHANNEL)
                        printk(KERN_DEBUG "hfcpci rec ch(%x) f1(%d) f2(%d)\n",
                               bch->nr, rxbz->f1, rxbz->f2);
                zp = &rxbz->za[rxbz->f2];

                rcnt = le16_to_cpu(zp->z1) - le16_to_cpu(zp->z2);
                if (rcnt < 0)
                        rcnt += B_FIFO_SIZE;
                rcnt++;
                if (bch->debug & DEBUG_HW_BCHANNEL)
                        printk(KERN_DEBUG
                               "hfcpci rec ch(%x) z1(%x) z2(%x) cnt(%d)\n",
                               bch->nr, le16_to_cpu(zp->z1),
                               le16_to_cpu(zp->z2), rcnt);
                hfcpci_empty_bfifo(bch, rxbz, bdata, rcnt);
                rcnt = rxbz->f1 - rxbz->f2;
                if (rcnt < 0)
                        rcnt += MAX_B_FRAMES + 1;
                if (hc->hw.last_bfifo_cnt[real_fifo] > rcnt + 1) {
                        rcnt = 0;
                        hfcpci_clear_fifo_rx(hc, real_fifo);
                }
                hc->hw.last_bfifo_cnt[real_fifo] = rcnt;
                if (rcnt > 1)
                        receive = 1;
                else
                        receive = 0;
        } else if (test_bit(FLG_TRANSPARENT, &bch->Flags)) {
                hfcpci_empty_fifo_trans(bch, rxbz, txbz, bdata);
                return;
        } else
                receive = 0;
        if (count && receive)
                goto Begin;

}

/*
 * D-channel send routine
 */
static void
hfcpci_fill_dfifo(struct hfc_pci *hc)
{
        struct dchannel *dch = &hc->dch;
        int             fcnt;
        int             count, new_z1, maxlen;
        struct dfifo    *df;
        u_char          *src, *dst, new_f1;

        if ((dch->debug & DEBUG_HW_DCHANNEL) && !(dch->debug & DEBUG_HW_DFIFO))
                printk(KERN_DEBUG "%s\n", __func__);

        if (!dch->tx_skb)
                return;
        count = dch->tx_skb->len - dch->tx_idx;
        if (count <= 0)
                return;
        df = &((union fifo_area *) (hc->hw.fifos))->d_chan.d_tx;

        if (dch->debug & DEBUG_HW_DFIFO)
                printk(KERN_DEBUG "%s:f1(%d) f2(%d) z1(f1)(%x)\n", __func__,
                       df->f1, df->f2,
                       le16_to_cpu(df->za[df->f1 & D_FREG_MASK].z1));
        fcnt = df->f1 - df->f2; /* frame count actually buffered */
        if (fcnt < 0)
                fcnt += (MAX_D_FRAMES + 1);     /* if wrap around */
        if (fcnt > (MAX_D_FRAMES - 1)) {
                if (dch->debug & DEBUG_HW_DCHANNEL)
                        printk(KERN_DEBUG
                               "hfcpci_fill_Dfifo more as 14 frames\n");
#ifdef ERROR_STATISTIC
                cs->err_tx++;
#endif
                return;
        }
        /* now determine free bytes in FIFO buffer */
        maxlen = le16_to_cpu(df->za[df->f2 & D_FREG_MASK].z2) -
                le16_to_cpu(df->za[df->f1 & D_FREG_MASK].z1) - 1;
        if (maxlen <= 0)
                maxlen += D_FIFO_SIZE;  /* count now contains available bytes */

        if (dch->debug & DEBUG_HW_DCHANNEL)
                printk(KERN_DEBUG "hfcpci_fill_Dfifo count(%d/%d)\n",
                       count, maxlen);
        if (count > maxlen) {
                if (dch->debug & DEBUG_HW_DCHANNEL)
                        printk(KERN_DEBUG "hfcpci_fill_Dfifo no fifo mem\n");
                return;
        }
        new_z1 = (le16_to_cpu(df->za[df->f1 & D_FREG_MASK].z1) + count) &
                (D_FIFO_SIZE - 1);
        new_f1 = ((df->f1 + 1) & D_FREG_MASK) | (D_FREG_MASK + 1);
        src = dch->tx_skb->data + dch->tx_idx;  /* source pointer */
        dst = df->data + le16_to_cpu(df->za[df->f1 & D_FREG_MASK].z1);
        maxlen = D_FIFO_SIZE - le16_to_cpu(df->za[df->f1 & D_FREG_MASK].z1);
        /* end fifo */
        if (maxlen > count)
                maxlen = count; /* limit size */
        memcpy(dst, src, maxlen);       /* first copy */

        count -= maxlen;        /* remaining bytes */
        if (count) {
                dst = df->data; /* start of buffer */
                src += maxlen;  /* new position */
                memcpy(dst, src, count);
        }
        df->za[new_f1 & D_FREG_MASK].z1 = cpu_to_le16(new_z1);
        /* for next buffer */
        df->za[df->f1 & D_FREG_MASK].z1 = cpu_to_le16(new_z1);
        /* new pos actual buffer */
        df->f1 = new_f1;        /* next frame */
        dch->tx_idx = dch->tx_skb->len;
}

/*
 * B-channel send routine
 */
static void
hfcpci_fill_fifo(struct bchannel *bch)
{
        struct hfc_pci  *hc = bch->hw;
        int             maxlen, fcnt;
        int             count, new_z1;
        struct bzfifo   *bz;
        u_char          *bdata;
        u_char          new_f1, *src, *dst;
        __le16 *z1t, *z2t;

        if ((bch->debug & DEBUG_HW_BCHANNEL) && !(bch->debug & DEBUG_HW_BFIFO))
                printk(KERN_DEBUG "%s\n", __func__);
        if ((!bch->tx_skb) || bch->tx_skb->len == 0) {
                if (!test_bit(FLG_FILLEMPTY, &bch->Flags) &&
                    !test_bit(FLG_TRANSPARENT, &bch->Flags))
                        return;
                count = HFCPCI_FILLEMPTY;
        } else {
                count = bch->tx_skb->len - bch->tx_idx;
        }
        if ((bch->nr & 2) && (!hc->hw.bswapped)) {
                bz = &((union fifo_area *)(hc->hw.fifos))->b_chans.txbz_b2;
                bdata = ((union fifo_area *)(hc->hw.fifos))->b_chans.txdat_b2;
        } else {
                bz = &((union fifo_area *)(hc->hw.fifos))->b_chans.txbz_b1;
                bdata = ((union fifo_area *)(hc->hw.fifos))->b_chans.txdat_b1;
        }

        if (test_bit(FLG_TRANSPARENT, &bch->Flags)) {
                z1t = &bz->za[MAX_B_FRAMES].z1;
                z2t = z1t + 1;
                if (bch->debug & DEBUG_HW_BCHANNEL)
                        printk(KERN_DEBUG "hfcpci_fill_fifo_trans ch(%x) "
                               "cnt(%d) z1(%x) z2(%x)\n", bch->nr, count,
                               le16_to_cpu(*z1t), le16_to_cpu(*z2t));
                fcnt = le16_to_cpu(*z2t) - le16_to_cpu(*z1t);
                if (fcnt <= 0)
                        fcnt += B_FIFO_SIZE;
                if (test_bit(FLG_FILLEMPTY, &bch->Flags)) {
                        /* fcnt contains available bytes in fifo */
                        if (count > fcnt)
                                count = fcnt;
                        new_z1 = le16_to_cpu(*z1t) + count;
                        /* new buffer Position */
                        if (new_z1 >= (B_FIFO_SIZE + B_SUB_VAL))
                                new_z1 -= B_FIFO_SIZE;  /* buffer wrap */
                        dst = bdata + (le16_to_cpu(*z1t) - B_SUB_VAL);
                        maxlen = (B_FIFO_SIZE + B_SUB_VAL) - le16_to_cpu(*z1t);
                        /* end of fifo */
                        if (bch->debug & DEBUG_HW_BFIFO)
                                printk(KERN_DEBUG "hfcpci_FFt fillempty "
                                       "fcnt(%d) maxl(%d) nz1(%x) dst(%p)\n",
                                       fcnt, maxlen, new_z1, dst);
                        if (maxlen > count)
                                maxlen = count;         /* limit size */
                        memset(dst, bch->fill[0], maxlen); /* first copy */
                        count -= maxlen;                /* remaining bytes */
                        if (count) {
                                dst = bdata;            /* start of buffer */
                                memset(dst, bch->fill[0], count);
                        }
                        *z1t = cpu_to_le16(new_z1);     /* now send data */
                        return;
                }
                /* fcnt contains available bytes in fifo */
                fcnt = B_FIFO_SIZE - fcnt;
                /* remaining bytes to send (bytes in fifo) */

        next_t_frame:
                count = bch->tx_skb->len - bch->tx_idx;
                /* maximum fill shall be poll*2 */
                if (count > (poll << 1) - fcnt)
                        count = (poll << 1) - fcnt;
                if (count <= 0)
                        return;
                /* data is suitable for fifo */
                new_z1 = le16_to_cpu(*z1t) + count;
                /* new buffer Position */
                if (new_z1 >= (B_FIFO_SIZE + B_SUB_VAL))
                        new_z1 -= B_FIFO_SIZE;  /* buffer wrap */
                src = bch->tx_skb->data + bch->tx_idx;
                /* source pointer */
                dst = bdata + (le16_to_cpu(*z1t) - B_SUB_VAL);
                maxlen = (B_FIFO_SIZE + B_SUB_VAL) - le16_to_cpu(*z1t);
                /* end of fifo */
                if (bch->debug & DEBUG_HW_BFIFO)
                        printk(KERN_DEBUG "hfcpci_FFt fcnt(%d) "
                               "maxl(%d) nz1(%x) dst(%p)\n",
                               fcnt, maxlen, new_z1, dst);
                fcnt += count;
                bch->tx_idx += count;
                if (maxlen > count)
                        maxlen = count;         /* limit size */
                memcpy(dst, src, maxlen);       /* first copy */
                count -= maxlen;        /* remaining bytes */
                if (count) {
                        dst = bdata;    /* start of buffer */
                        src += maxlen;  /* new position */
                        memcpy(dst, src, count);
                }
                *z1t = cpu_to_le16(new_z1);     /* now send data */
                if (bch->tx_idx < bch->tx_skb->len)
                        return;
                dev_kfree_skb(bch->tx_skb);
                if (get_next_bframe(bch))
                        goto next_t_frame;
                return;
        }
        if (bch->debug & DEBUG_HW_BCHANNEL)
                printk(KERN_DEBUG
                       "%s: ch(%x) f1(%d) f2(%d) z1(f1)(%x)\n",
                       __func__, bch->nr, bz->f1, bz->f2,
                       bz->za[bz->f1].z1);
        fcnt = bz->f1 - bz->f2; /* frame count actually buffered */
        if (fcnt < 0)
                fcnt += (MAX_B_FRAMES + 1);     /* if wrap around */
        if (fcnt > (MAX_B_FRAMES - 1)) {
                if (bch->debug & DEBUG_HW_BCHANNEL)
                        printk(KERN_DEBUG
                               "hfcpci_fill_Bfifo more as 14 frames\n");
                return;
        }
        /* now determine free bytes in FIFO buffer */
        maxlen = le16_to_cpu(bz->za[bz->f2].z2) -
                le16_to_cpu(bz->za[bz->f1].z1) - 1;
        if (maxlen <= 0)
                maxlen += B_FIFO_SIZE;  /* count now contains available bytes */

        if (bch->debug & DEBUG_HW_BCHANNEL)
                printk(KERN_DEBUG "hfcpci_fill_fifo ch(%x) count(%d/%d)\n",
                       bch->nr, count, maxlen);

        if (maxlen < count) {
                if (bch->debug & DEBUG_HW_BCHANNEL)
                        printk(KERN_DEBUG "hfcpci_fill_fifo no fifo mem\n");
                return;
        }
        new_z1 = le16_to_cpu(bz->za[bz->f1].z1) + count;
        /* new buffer Position */
        if (new_z1 >= (B_FIFO_SIZE + B_SUB_VAL))
                new_z1 -= B_FIFO_SIZE;  /* buffer wrap */

        new_f1 = ((bz->f1 + 1) & MAX_B_FRAMES);
        src = bch->tx_skb->data + bch->tx_idx;  /* source pointer */
        dst = bdata + (le16_to_cpu(bz->za[bz->f1].z1) - B_SUB_VAL);
        maxlen = (B_FIFO_SIZE + B_SUB_VAL) - le16_to_cpu(bz->za[bz->f1].z1);
        /* end fifo */
        if (maxlen > count)
                maxlen = count; /* limit size */
        memcpy(dst, src, maxlen);       /* first copy */

        count -= maxlen;        /* remaining bytes */
        if (count) {
                dst = bdata;    /* start of buffer */
                src += maxlen;  /* new position */
                memcpy(dst, src, count);
        }
        bz->za[new_f1].z1 = cpu_to_le16(new_z1);        /* for next buffer */
        bz->f1 = new_f1;        /* next frame */
        dev_kfree_skb(bch->tx_skb);
        get_next_bframe(bch);
}



/*
 * handle L1 state changes TE
 */

static void
ph_state_te(struct dchannel *dch)
{
        if (dch->debug)
                printk(KERN_DEBUG "%s: TE newstate %x\n",
                       __func__, dch->state);
        switch (dch->state) {
        case 0:
                l1_event(dch->l1, HW_RESET_IND);
                break;
        case 3:
                l1_event(dch->l1, HW_DEACT_IND);
                break;
        case 5:
        case 8:
                l1_event(dch->l1, ANYSIGNAL);
                break;
        case 6:
                l1_event(dch->l1, INFO2);
                break;
        case 7:
                l1_event(dch->l1, INFO4_P8);
                break;
        }
}

/*
 * handle L1 state changes NT
 */

static void
handle_nt_timer3(struct dchannel *dch) {
        struct hfc_pci  *hc = dch->hw;

        test_and_clear_bit(FLG_HFC_TIMER_T3, &dch->Flags);
        hc->hw.int_m1 &= ~HFCPCI_INTS_TIMER;
        Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
        hc->hw.nt_timer = 0;
        test_and_set_bit(FLG_ACTIVE, &dch->Flags);
        if (test_bit(HFC_CFG_MASTER, &hc->cfg))
                hc->hw.mst_m |= HFCPCI_MASTER;
        Write_hfc(hc, HFCPCI_MST_MODE, hc->hw.mst_m);
        _queue_data(&dch->dev.D, PH_ACTIVATE_IND,
                    MISDN_ID_ANY, 0, NULL, GFP_ATOMIC);
}

static void
ph_state_nt(struct dchannel *dch)
{
        struct hfc_pci  *hc = dch->hw;

        if (dch->debug)
                printk(KERN_DEBUG "%s: NT newstate %x\n",
                       __func__, dch->state);
        switch (dch->state) {
        case 2:
                if (hc->hw.nt_timer < 0) {
                        hc->hw.nt_timer = 0;
                        test_and_clear_bit(FLG_HFC_TIMER_T3, &dch->Flags);
                        test_and_clear_bit(FLG_HFC_TIMER_T1, &dch->Flags);
                        hc->hw.int_m1 &= ~HFCPCI_INTS_TIMER;
                        Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
                        /* Clear already pending ints */
                        (void) Read_hfc(hc, HFCPCI_INT_S1);
                        Write_hfc(hc, HFCPCI_STATES, 4 | HFCPCI_LOAD_STATE);
                        udelay(10);
                        Write_hfc(hc, HFCPCI_STATES, 4);
                        dch->state = 4;
                } else if (hc->hw.nt_timer == 0) {
                        hc->hw.int_m1 |= HFCPCI_INTS_TIMER;
                        Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
                        hc->hw.nt_timer = NT_T1_COUNT;
                        hc->hw.ctmt &= ~HFCPCI_AUTO_TIMER;
                        hc->hw.ctmt |= HFCPCI_TIM3_125;
                        Write_hfc(hc, HFCPCI_CTMT, hc->hw.ctmt |
                                  HFCPCI_CLTIMER);
                        test_and_clear_bit(FLG_HFC_TIMER_T3, &dch->Flags);
                        test_and_set_bit(FLG_HFC_TIMER_T1, &dch->Flags);
                        /* allow G2 -> G3 transition */
                        Write_hfc(hc, HFCPCI_STATES, 2 | HFCPCI_NT_G2_G3);

                } else {
                        Write_hfc(hc, HFCPCI_STATES, 2 | HFCPCI_NT_G2_G3);
                }
                break;
        case 1:
                hc->hw.nt_timer = 0;
                test_and_clear_bit(FLG_HFC_TIMER_T3, &dch->Flags);
                test_and_clear_bit(FLG_HFC_TIMER_T1, &dch->Flags);
                hc->hw.int_m1 &= ~HFCPCI_INTS_TIMER;
                Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
                test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
                hc->hw.mst_m &= ~HFCPCI_MASTER;
                Write_hfc(hc, HFCPCI_MST_MODE, hc->hw.mst_m);
                test_and_clear_bit(FLG_L2_ACTIVATED, &dch->Flags);
                _queue_data(&dch->dev.D, PH_DEACTIVATE_IND,
                            MISDN_ID_ANY, 0, NULL, GFP_ATOMIC);
                break;
        case 4:
                hc->hw.nt_timer = 0;
                test_and_clear_bit(FLG_HFC_TIMER_T3, &dch->Flags);
                test_and_clear_bit(FLG_HFC_TIMER_T1, &dch->Flags);
                hc->hw.int_m1 &= ~HFCPCI_INTS_TIMER;
                Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
                break;
        case 3:
                if (!test_and_set_bit(FLG_HFC_TIMER_T3, &dch->Flags)) {
                        if (!test_and_clear_bit(FLG_L2_ACTIVATED,
                                                &dch->Flags)) {
                                handle_nt_timer3(dch);
                                break;
                        }
                        test_and_clear_bit(FLG_HFC_TIMER_T1, &dch->Flags);
                        hc->hw.int_m1 |= HFCPCI_INTS_TIMER;
                        Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
                        hc->hw.nt_timer = NT_T3_COUNT;
                        hc->hw.ctmt &= ~HFCPCI_AUTO_TIMER;
                        hc->hw.ctmt |= HFCPCI_TIM3_125;
                        Write_hfc(hc, HFCPCI_CTMT, hc->hw.ctmt |
                                  HFCPCI_CLTIMER);
                }
                break;
        }
}

static void
ph_state(struct dchannel *dch)
{
        struct hfc_pci  *hc = dch->hw;

        if (hc->hw.protocol == ISDN_P_NT_S0) {
                if (test_bit(FLG_HFC_TIMER_T3, &dch->Flags) &&
                    hc->hw.nt_timer < 0)
                        handle_nt_timer3(dch);
                else
                        ph_state_nt(dch);
        } else
                ph_state_te(dch);
}

/*
 * Layer 1 callback function
 */
static int
hfc_l1callback(struct dchannel *dch, u_int cmd)
{
        struct hfc_pci          *hc = dch->hw;

        switch (cmd) {
        case INFO3_P8:
        case INFO3_P10:
                if (test_bit(HFC_CFG_MASTER, &hc->cfg))
                        hc->hw.mst_m |= HFCPCI_MASTER;
                Write_hfc(hc, HFCPCI_MST_MODE, hc->hw.mst_m);
                break;
        case HW_RESET_REQ:
                Write_hfc(hc, HFCPCI_STATES, HFCPCI_LOAD_STATE | 3);
                /* HFC ST 3 */
                udelay(6);
                Write_hfc(hc, HFCPCI_STATES, 3);        /* HFC ST 2 */
                if (test_bit(HFC_CFG_MASTER, &hc->cfg))
                        hc->hw.mst_m |= HFCPCI_MASTER;
                Write_hfc(hc, HFCPCI_MST_MODE, hc->hw.mst_m);
                Write_hfc(hc, HFCPCI_STATES, HFCPCI_ACTIVATE |
                          HFCPCI_DO_ACTION);
                l1_event(dch->l1, HW_POWERUP_IND);
                break;
        case HW_DEACT_REQ:
                hc->hw.mst_m &= ~HFCPCI_MASTER;
                Write_hfc(hc, HFCPCI_MST_MODE, hc->hw.mst_m);
                skb_queue_purge(&dch->squeue);
                if (dch->tx_skb) {
                        dev_kfree_skb(dch->tx_skb);
                        dch->tx_skb = NULL;
                }
                dch->tx_idx = 0;
                if (dch->rx_skb) {
                        dev_kfree_skb(dch->rx_skb);
                        dch->rx_skb = NULL;
                }
                test_and_clear_bit(FLG_TX_BUSY, &dch->Flags);
                if (test_and_clear_bit(FLG_BUSY_TIMER, &dch->Flags))
                        del_timer(&dch->timer);
                break;
        case HW_POWERUP_REQ:
                Write_hfc(hc, HFCPCI_STATES, HFCPCI_DO_ACTION);
                break;
        case PH_ACTIVATE_IND:
                test_and_set_bit(FLG_ACTIVE, &dch->Flags);
                _queue_data(&dch->dev.D, cmd, MISDN_ID_ANY, 0, NULL,
                            GFP_ATOMIC);
                break;
        case PH_DEACTIVATE_IND:
                test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
                _queue_data(&dch->dev.D, cmd, MISDN_ID_ANY, 0, NULL,
                            GFP_ATOMIC);
                break;
        default:
                if (dch->debug & DEBUG_HW)
                        printk(KERN_DEBUG "%s: unknown command %x\n",
                               __func__, cmd);
                return -1;
        }
        return 0;
}

/*
 * Interrupt handler
 */
static inline void
tx_birq(struct bchannel *bch)
{
        if (bch->tx_skb && bch->tx_idx < bch->tx_skb->len)
                hfcpci_fill_fifo(bch);
        else {
                if (bch->tx_skb)
                        dev_kfree_skb(bch->tx_skb);
                if (get_next_bframe(bch))
                        hfcpci_fill_fifo(bch);
        }
}

static inline void
tx_dirq(struct dchannel *dch)
{
        if (dch->tx_skb && dch->tx_idx < dch->tx_skb->len)
                hfcpci_fill_dfifo(dch->hw);
        else {
                if (dch->tx_skb)
                        dev_kfree_skb(dch->tx_skb);
                if (get_next_dframe(dch))
                        hfcpci_fill_dfifo(dch->hw);
        }
}

static irqreturn_t
hfcpci_int(int intno, void *dev_id)
{
        struct hfc_pci  *hc = dev_id;
        u_char          exval;
        struct bchannel *bch;
        u_char          val, stat;

        spin_lock(&hc->lock);
        if (!(hc->hw.int_m2 & 0x08)) {
                spin_unlock(&hc->lock);
                return IRQ_NONE; /* not initialised */
        }
        stat = Read_hfc(hc, HFCPCI_STATUS);
        if (HFCPCI_ANYINT & stat) {
                val = Read_hfc(hc, HFCPCI_INT_S1);
                if (hc->dch.debug & DEBUG_HW_DCHANNEL)
                        printk(KERN_DEBUG
                               "HFC-PCI: stat(%02x) s1(%02x)\n", stat, val);
        } else {
                /* shared */
                spin_unlock(&hc->lock);
                return IRQ_NONE;
        }
        hc->irqcnt++;

        if (hc->dch.debug & DEBUG_HW_DCHANNEL)
                printk(KERN_DEBUG "HFC-PCI irq %x\n", val);
        val &= hc->hw.int_m1;
        if (val & 0x40) {       /* state machine irq */
                exval = Read_hfc(hc, HFCPCI_STATES) & 0xf;
                if (hc->dch.debug & DEBUG_HW_DCHANNEL)
                        printk(KERN_DEBUG "ph_state chg %d->%d\n",
                               hc->dch.state, exval);
                hc->dch.state = exval;
                schedule_event(&hc->dch, FLG_PHCHANGE);
                val &= ~0x40;
        }
        if (val & 0x80) {       /* timer irq */
                if (hc->hw.protocol == ISDN_P_NT_S0) {
                        if ((--hc->hw.nt_timer) < 0)
                                schedule_event(&hc->dch, FLG_PHCHANGE);
                }
                val &= ~0x80;
                Write_hfc(hc, HFCPCI_CTMT, hc->hw.ctmt | HFCPCI_CLTIMER);
        }
        if (val & 0x08) {       /* B1 rx */
                bch = Sel_BCS(hc, hc->hw.bswapped ? 2 : 1);
                if (bch)
                        main_rec_hfcpci(bch);
                else if (hc->dch.debug)
                        printk(KERN_DEBUG "hfcpci spurious 0x08 IRQ\n");
        }
        if (val & 0x10) {       /* B2 rx */
                bch = Sel_BCS(hc, 2);
                if (bch)
                        main_rec_hfcpci(bch);
                else if (hc->dch.debug)
                        printk(KERN_DEBUG "hfcpci spurious 0x10 IRQ\n");
        }
        if (val & 0x01) {       /* B1 tx */
                bch = Sel_BCS(hc, hc->hw.bswapped ? 2 : 1);
                if (bch)
                        tx_birq(bch);
                else if (hc->dch.debug)
                        printk(KERN_DEBUG "hfcpci spurious 0x01 IRQ\n");
        }
        if (val & 0x02) {       /* B2 tx */
                bch = Sel_BCS(hc, 2);
                if (bch)
                        tx_birq(bch);
                else if (hc->dch.debug)
                        printk(KERN_DEBUG "hfcpci spurious 0x02 IRQ\n");
        }
        if (val & 0x20)         /* D rx */
                receive_dmsg(hc);
        if (val & 0x04) {       /* D tx */
                if (test_and_clear_bit(FLG_BUSY_TIMER, &hc->dch.Flags))
                        del_timer(&hc->dch.timer);
                tx_dirq(&hc->dch);
        }
        spin_unlock(&hc->lock);
        return IRQ_HANDLED;
}

/*
 * timer callback for D-chan busy resolution. Currently no function
 */
static void
hfcpci_dbusy_timer(struct hfc_pci *hc)
{
}

/*
 * activate/deactivate hardware for selected channels and mode
 */
static int
mode_hfcpci(struct bchannel *bch, int bc, int protocol)
{
        struct hfc_pci  *hc = bch->hw;
        int             fifo2;
        u_char          rx_slot = 0, tx_slot = 0, pcm_mode;

        if (bch->debug & DEBUG_HW_BCHANNEL)
                printk(KERN_DEBUG
                       "HFCPCI bchannel protocol %x-->%x ch %x-->%x\n",
                       bch->state, protocol, bch->nr, bc);

        fifo2 = bc;
        pcm_mode = (bc >> 24) & 0xff;
        if (pcm_mode) { /* PCM SLOT USE */
                if (!test_bit(HFC_CFG_PCM, &hc->cfg))
                        printk(KERN_WARNING
                               "%s: pcm channel id without HFC_CFG_PCM\n",
                               __func__);
                rx_slot = (bc >> 8) & 0xff;
                tx_slot = (bc >> 16) & 0xff;
                bc = bc & 0xff;
        } else if (test_bit(HFC_CFG_PCM, &hc->cfg) && (protocol > ISDN_P_NONE))
                printk(KERN_WARNING "%s: no pcm channel id but HFC_CFG_PCM\n",
                       __func__);
        if (hc->chanlimit > 1) {
                hc->hw.bswapped = 0;    /* B1 and B2 normal mode */
                hc->hw.sctrl_e &= ~0x80;
        } else {
                if (bc & 2) {
                        if (protocol != ISDN_P_NONE) {
                                hc->hw.bswapped = 1; /* B1 and B2 exchanged */
                                hc->hw.sctrl_e |= 0x80;
                        } else {
                                hc->hw.bswapped = 0; /* B1 and B2 normal mode */
                                hc->hw.sctrl_e &= ~0x80;
                        }
                        fifo2 = 1;
                } else {
                        hc->hw.bswapped = 0;    /* B1 and B2 normal mode */
                        hc->hw.sctrl_e &= ~0x80;
                }
        }
        switch (protocol) {
        case (-1): /* used for init */
                bch->state = -1;
                bch->nr = bc;
        case (ISDN_P_NONE):
                if (bch->state == ISDN_P_NONE)
                        return 0;
                if (bc & 2) {
                        hc->hw.sctrl &= ~SCTRL_B2_ENA;
                        hc->hw.sctrl_r &= ~SCTRL_B2_ENA;
                } else {
                        hc->hw.sctrl &= ~SCTRL_B1_ENA;
                        hc->hw.sctrl_r &= ~SCTRL_B1_ENA;
                }
                if (fifo2 & 2) {
                        hc->hw.fifo_en &= ~HFCPCI_FIFOEN_B2;
                        hc->hw.int_m1 &= ~(HFCPCI_INTS_B2TRANS +
                                           HFCPCI_INTS_B2REC);
                } else {
                        hc->hw.fifo_en &= ~HFCPCI_FIFOEN_B1;
                        hc->hw.int_m1 &= ~(HFCPCI_INTS_B1TRANS +
                                           HFCPCI_INTS_B1REC);
                }
#ifdef REVERSE_BITORDER
                if (bch->nr & 2)
                        hc->hw.cirm &= 0x7f;
                else
                        hc->hw.cirm &= 0xbf;
#endif
                bch->state = ISDN_P_NONE;
                bch->nr = bc;
                test_and_clear_bit(FLG_HDLC, &bch->Flags);
                test_and_clear_bit(FLG_TRANSPARENT, &bch->Flags);
                break;
        case (ISDN_P_B_RAW):
                bch->state = protocol;
                bch->nr = bc;
                hfcpci_clear_fifo_rx(hc, (fifo2 & 2) ? 1 : 0);
                hfcpci_clear_fifo_tx(hc, (fifo2 & 2) ? 1 : 0);
                if (bc & 2) {
                        hc->hw.sctrl |= SCTRL_B2_ENA;
                        hc->hw.sctrl_r |= SCTRL_B2_ENA;
#ifdef REVERSE_BITORDER
                        hc->hw.cirm |= 0x80;
#endif
                } else {
                        hc->hw.sctrl |= SCTRL_B1_ENA;
                        hc->hw.sctrl_r |= SCTRL_B1_ENA;
#ifdef REVERSE_BITORDER
                        hc->hw.cirm |= 0x40;
#endif
                }
                if (fifo2 & 2) {
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B2;
                        if (!tics)
                                hc->hw.int_m1 |= (HFCPCI_INTS_B2TRANS +
                                                  HFCPCI_INTS_B2REC);
                        hc->hw.ctmt |= 2;
                        hc->hw.conn &= ~0x18;
                } else {
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B1;
                        if (!tics)
                                hc->hw.int_m1 |= (HFCPCI_INTS_B1TRANS +
                                                  HFCPCI_INTS_B1REC);
                        hc->hw.ctmt |= 1;
                        hc->hw.conn &= ~0x03;
                }
                test_and_set_bit(FLG_TRANSPARENT, &bch->Flags);
                break;
        case (ISDN_P_B_HDLC):
                bch->state = protocol;
                bch->nr = bc;
                hfcpci_clear_fifo_rx(hc, (fifo2 & 2) ? 1 : 0);
                hfcpci_clear_fifo_tx(hc, (fifo2 & 2) ? 1 : 0);
                if (bc & 2) {
                        hc->hw.sctrl |= SCTRL_B2_ENA;
                        hc->hw.sctrl_r |= SCTRL_B2_ENA;
                } else {
                        hc->hw.sctrl |= SCTRL_B1_ENA;
                        hc->hw.sctrl_r |= SCTRL_B1_ENA;
                }
                if (fifo2 & 2) {
                        hc->hw.last_bfifo_cnt[1] = 0;
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B2;
                        hc->hw.int_m1 |= (HFCPCI_INTS_B2TRANS +
                                          HFCPCI_INTS_B2REC);
                        hc->hw.ctmt &= ~2;
                        hc->hw.conn &= ~0x18;
                } else {
                        hc->hw.last_bfifo_cnt[0] = 0;
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B1;
                        hc->hw.int_m1 |= (HFCPCI_INTS_B1TRANS +
                                          HFCPCI_INTS_B1REC);
                        hc->hw.ctmt &= ~1;
                        hc->hw.conn &= ~0x03;
                }
                test_and_set_bit(FLG_HDLC, &bch->Flags);
                break;
        default:
                printk(KERN_DEBUG "prot not known %x\n", protocol);
                return -ENOPROTOOPT;
        }
        if (test_bit(HFC_CFG_PCM, &hc->cfg)) {
                if ((protocol == ISDN_P_NONE) ||
                    (protocol == -1)) { /* init case */
                        rx_slot = 0;
                        tx_slot = 0;
                } else {
                        if (test_bit(HFC_CFG_SW_DD_DU, &hc->cfg)) {
                                rx_slot |= 0xC0;
                                tx_slot |= 0xC0;
                        } else {
                                rx_slot |= 0x80;
                                tx_slot |= 0x80;
                        }
                }
                if (bc & 2) {
                        hc->hw.conn &= 0xc7;
                        hc->hw.conn |= 0x08;
                        printk(KERN_DEBUG "%s: Write_hfc: B2_SSL 0x%x\n",
                               __func__, tx_slot);
                        printk(KERN_DEBUG "%s: Write_hfc: B2_RSL 0x%x\n",
                               __func__, rx_slot);
                        Write_hfc(hc, HFCPCI_B2_SSL, tx_slot);
                        Write_hfc(hc, HFCPCI_B2_RSL, rx_slot);
                } else {
                        hc->hw.conn &= 0xf8;
                        hc->hw.conn |= 0x01;
                        printk(KERN_DEBUG "%s: Write_hfc: B1_SSL 0x%x\n",
                               __func__, tx_slot);
                        printk(KERN_DEBUG "%s: Write_hfc: B1_RSL 0x%x\n",
                               __func__, rx_slot);
                        Write_hfc(hc, HFCPCI_B1_SSL, tx_slot);
                        Write_hfc(hc, HFCPCI_B1_RSL, rx_slot);
                }
        }
        Write_hfc(hc, HFCPCI_SCTRL_E, hc->hw.sctrl_e);
        Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
        Write_hfc(hc, HFCPCI_FIFO_EN, hc->hw.fifo_en);
        Write_hfc(hc, HFCPCI_SCTRL, hc->hw.sctrl);
        Write_hfc(hc, HFCPCI_SCTRL_R, hc->hw.sctrl_r);
        Write_hfc(hc, HFCPCI_CTMT, hc->hw.ctmt);
        Write_hfc(hc, HFCPCI_CONNECT, hc->hw.conn);
#ifdef REVERSE_BITORDER
        Write_hfc(hc, HFCPCI_CIRM, hc->hw.cirm);
#endif
        return 0;
}

static int
set_hfcpci_rxtest(struct bchannel *bch, int protocol, int chan)
{
        struct hfc_pci  *hc = bch->hw;

        if (bch->debug & DEBUG_HW_BCHANNEL)
                printk(KERN_DEBUG
                       "HFCPCI bchannel test rx protocol %x-->%x ch %x-->%x\n",
                       bch->state, protocol, bch->nr, chan);
        if (bch->nr != chan) {
                printk(KERN_DEBUG
                       "HFCPCI rxtest wrong channel parameter %x/%x\n",
                       bch->nr, chan);
                return -EINVAL;
        }
        switch (protocol) {
        case (ISDN_P_B_RAW):
                bch->state = protocol;
                hfcpci_clear_fifo_rx(hc, (chan & 2) ? 1 : 0);
                if (chan & 2) {
                        hc->hw.sctrl_r |= SCTRL_B2_ENA;
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B2RX;
                        if (!tics)
                                hc->hw.int_m1 |= HFCPCI_INTS_B2REC;
                        hc->hw.ctmt |= 2;
                        hc->hw.conn &= ~0x18;
#ifdef REVERSE_BITORDER
                        hc->hw.cirm |= 0x80;
#endif
                } else {
                        hc->hw.sctrl_r |= SCTRL_B1_ENA;
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B1RX;
                        if (!tics)
                                hc->hw.int_m1 |= HFCPCI_INTS_B1REC;
                        hc->hw.ctmt |= 1;
                        hc->hw.conn &= ~0x03;
#ifdef REVERSE_BITORDER
                        hc->hw.cirm |= 0x40;
#endif
                }
                break;
        case (ISDN_P_B_HDLC):
                bch->state = protocol;
                hfcpci_clear_fifo_rx(hc, (chan & 2) ? 1 : 0);
                if (chan & 2) {
                        hc->hw.sctrl_r |= SCTRL_B2_ENA;
                        hc->hw.last_bfifo_cnt[1] = 0;
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B2RX;
                        hc->hw.int_m1 |= HFCPCI_INTS_B2REC;
                        hc->hw.ctmt &= ~2;
                        hc->hw.conn &= ~0x18;
                } else {
                        hc->hw.sctrl_r |= SCTRL_B1_ENA;
                        hc->hw.last_bfifo_cnt[0] = 0;
                        hc->hw.fifo_en |= HFCPCI_FIFOEN_B1RX;
                        hc->hw.int_m1 |= HFCPCI_INTS_B1REC;
                        hc->hw.ctmt &= ~1;
                        hc->hw.conn &= ~0x03;
                }
                break;
        default:
                printk(KERN_DEBUG "prot not known %x\n", protocol);
                return -ENOPROTOOPT;
        }
        Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
        Write_hfc(hc, HFCPCI_FIFO_EN, hc->hw.fifo_en);
        Write_hfc(hc, HFCPCI_SCTRL_R, hc->hw.sctrl_r);
        Write_hfc(hc, HFCPCI_CTMT, hc->hw.ctmt);
        Write_hfc(hc, HFCPCI_CONNECT, hc->hw.conn);
#ifdef REVERSE_BITORDER
        Write_hfc(hc, HFCPCI_CIRM, hc->hw.cirm);
#endif
        return 0;
}

static void
deactivate_bchannel(struct bchannel *bch)
{
        struct hfc_pci  *hc = bch->hw;
        u_long          flags;

        spin_lock_irqsave(&hc->lock, flags);
        mISDN_clear_bchannel(bch);
        mode_hfcpci(bch, bch->nr, ISDN_P_NONE);
        spin_unlock_irqrestore(&hc->lock, flags);
}

/*
 * Layer 1 B-channel hardware access
 */
static int
channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
{
        return mISDN_ctrl_bchannel(bch, cq);
}
static int
hfc_bctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
{
        struct bchannel *bch = container_of(ch, struct bchannel, ch);
        struct hfc_pci  *hc = bch->hw;
        int             ret = -EINVAL;
        u_long          flags;

        if (bch->debug & DEBUG_HW)
                printk(KERN_DEBUG "%s: cmd:%x %p\n", __func__, cmd, arg);
        switch (cmd) {
        case HW_TESTRX_RAW:
                spin_lock_irqsave(&hc->lock, flags);
                ret = set_hfcpci_rxtest(bch, ISDN_P_B_RAW, (int)(long)arg);
                spin_unlock_irqrestore(&hc->lock, flags);
                break;
        case HW_TESTRX_HDLC:
                spin_lock_irqsave(&hc->lock, flags);
                ret = set_hfcpci_rxtest(bch, ISDN_P_B_HDLC, (int)(long)arg);
                spin_unlock_irqrestore(&hc->lock, flags);
                break;
        case HW_TESTRX_OFF:
                spin_lock_irqsave(&hc->lock, flags);
                mode_hfcpci(bch, bch->nr, ISDN_P_NONE);
                spin_unlock_irqrestore(&hc->lock, flags);
                ret = 0;
                break;
        case CLOSE_CHANNEL:
                test_and_clear_bit(FLG_OPEN, &bch->Flags);
                deactivate_bchannel(bch);
                ch->protocol = ISDN_P_NONE;
                ch->peer = NULL;
                module_put(THIS_MODULE);
                ret = 0;
                break;
        case CONTROL_CHANNEL:
                ret = channel_bctrl(bch, arg);
                break;
        default:
                printk(KERN_WARNING "%s: unknown prim(%x)\n",
                       __func__, cmd);
        }
        return ret;
}

/*
 * Layer2 -> Layer 1 Dchannel data
 */
static int
hfcpci_l2l1D(struct mISDNchannel *ch, struct sk_buff *skb)
{
        struct mISDNdevice      *dev = container_of(ch, struct mISDNdevice, D);
        struct dchannel         *dch = container_of(dev, struct dchannel, dev);
        struct hfc_pci          *hc = dch->hw;
        int                     ret = -EINVAL;
        struct mISDNhead        *hh = mISDN_HEAD_P(skb);
        unsigned int            id;
        u_long                  flags;

        switch (hh->prim) {
        case PH_DATA_REQ:
                spin_lock_irqsave(&hc->lock, flags);
                ret = dchannel_senddata(dch, skb);
                if (ret > 0) { /* direct TX */
                        id = hh->id; /* skb can be freed */
                        hfcpci_fill_dfifo(dch->hw);
                        ret = 0;
                        spin_unlock_irqrestore(&hc->lock, flags);
                        queue_ch_frame(ch, PH_DATA_CNF, id, NULL);
                } else
                        spin_unlock_irqrestore(&hc->lock, flags);
                return ret;
        case PH_ACTIVATE_REQ:
                spin_lock_irqsave(&hc->lock, flags);
                if (hc->hw.protocol == ISDN_P_NT_S0) {
                        ret = 0;
                        if (test_bit(HFC_CFG_MASTER, &hc->cfg))
                                hc->hw.mst_m |= HFCPCI_MASTER;
                        Write_hfc(hc, HFCPCI_MST_MODE, hc->hw.mst_m);
                        if (test_bit(FLG_ACTIVE, &dch->Flags)) {
                                spin_unlock_irqrestore(&hc->lock, flags);
                                _queue_data(&dch->dev.D, PH_ACTIVATE_IND,
                                            MISDN_ID_ANY, 0, NULL, GFP_ATOMIC);
                                break;
                        }
                        test_and_set_bit(FLG_L2_ACTIVATED, &dch->Flags);
                        Write_hfc(hc, HFCPCI_STATES, HFCPCI_ACTIVATE |
                                  HFCPCI_DO_ACTION | 1);
                } else
                        ret = l1_event(dch->l1, hh->prim);
                spin_unlock_irqrestore(&hc->lock, flags);
                break;
        case PH_DEACTIVATE_REQ:
                test_and_clear_bit(FLG_L2_ACTIVATED, &dch->Flags);
                spin_lock_irqsave(&hc->lock, flags);
                if (hc->hw.protocol == ISDN_P_NT_S0) {
                        /* prepare deactivation */
                        Write_hfc(hc, HFCPCI_STATES, 0x40);
                        skb_queue_purge(&dch->squeue);
                        if (dch->tx_skb) {
                                dev_kfree_skb(dch->tx_skb);
                                dch->tx_skb = NULL;
                        }
                        dch->tx_idx = 0;
                        if (dch->rx_skb) {
                                dev_kfree_skb(dch->rx_skb);
                                dch->rx_skb = NULL;
                        }
                        test_and_clear_bit(FLG_TX_BUSY, &dch->Flags);
                        if (test_and_clear_bit(FLG_BUSY_TIMER, &dch->Flags))
                                del_timer(&dch->timer);
#ifdef FIXME
                        if (test_and_clear_bit(FLG_L1_BUSY, &dch->Flags))
                                dchannel_sched_event(&hc->dch, D_CLEARBUSY);
#endif
                        hc->hw.mst_m &= ~HFCPCI_MASTER;
                        Write_hfc(hc, HFCPCI_MST_MODE, hc->hw.mst_m);
                        ret = 0;
                } else {
                        ret = l1_event(dch->l1, hh->prim);
                }
                spin_unlock_irqrestore(&hc->lock, flags);
                break;
        }
        if (!ret)
                dev_kfree_skb(skb);
        return ret;
}

/*
 * Layer2 -> Layer 1 Bchannel data
 */
static int
hfcpci_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
{
        struct bchannel         *bch = container_of(ch, struct bchannel, ch);
        struct hfc_pci          *hc = bch->hw;
        int                     ret = -EINVAL;
        struct mISDNhead        *hh = mISDN_HEAD_P(skb);
        unsigned long           flags;

        switch (hh->prim) {
        case PH_DATA_REQ:
                spin_lock_irqsave(&hc->lock, flags);
                ret = bchannel_senddata(bch, skb);
                if (ret > 0) { /* direct TX */
                        hfcpci_fill_fifo(bch);
                        ret = 0;
                }
                spin_unlock_irqrestore(&hc->lock, flags);
                return ret;
        case PH_ACTIVATE_REQ:
                spin_lock_irqsave(&hc->lock, flags);
                if (!test_and_set_bit(FLG_ACTIVE, &bch->Flags))
                        ret = mode_hfcpci(bch, bch->nr, ch->protocol);
                else
                        ret = 0;
                spin_unlock_irqrestore(&hc->lock, flags);
                if (!ret)
                        _queue_data(ch, PH_ACTIVATE_IND, MISDN_ID_ANY, 0,
                                    NULL, GFP_KERNEL);
                break;
        case PH_DEACTIVATE_REQ:
                deactivate_bchannel(bch);
                _queue_data(ch, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
                            NULL, GFP_KERNEL);
                ret = 0;
                break;
        }
        if (!ret)
                dev_kfree_skb(skb);
        return ret;
}

/*
 * called for card init message
 */

static void
inithfcpci(struct hfc_pci *hc)
{
        printk(KERN_DEBUG "inithfcpci: entered\n");
        hc->dch.timer.function = (void *) hfcpci_dbusy_timer;
        hc->dch.timer.data = (long) &hc->dch;
        init_timer(&hc->dch.timer);
        hc->chanlimit = 2;
        mode_hfcpci(&hc->bch[0], 1, -1);
        mode_hfcpci(&hc->bch[1], 2, -1);
}


static int
init_card(struct hfc_pci *hc)
{
        int     cnt = 3;
        u_long  flags;

        printk(KERN_DEBUG "init_card: entered\n");


        spin_lock_irqsave(&hc->lock, flags);
        disable_hwirq(hc);
        spin_unlock_irqrestore(&hc->lock, flags);
        if (request_irq(hc->irq, hfcpci_int, IRQF_SHARED, "HFC PCI", hc)) {
                printk(KERN_WARNING
                       "mISDN: couldn't get interrupt %d\n", hc->irq);
                return -EIO;
        }
        spin_lock_irqsave(&hc->lock, flags);
        reset_hfcpci(hc);
        while (cnt) {
                inithfcpci(hc);
                /*
                 * Finally enable IRQ output
                 * this is only allowed, if an IRQ routine is already
                 * established for this HFC, so don't do that earlier
                 */
                enable_hwirq(hc);
                spin_unlock_irqrestore(&hc->lock, flags);
                /* Timeout 80ms */
                current->state = TASK_UNINTERRUPTIBLE;
                schedule_timeout((80 * HZ) / 1000);
                printk(KERN_INFO "HFC PCI: IRQ %d count %d\n",
                       hc->irq, hc->irqcnt);
                /* now switch timer interrupt off */
                spin_lock_irqsave(&hc->lock, flags);
                hc->hw.int_m1 &= ~HFCPCI_INTS_TIMER;
                Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
                /* reinit mode reg */
                Write_hfc(hc, HFCPCI_MST_MODE, hc->hw.mst_m);
                if (!hc->irqcnt) {
                        printk(KERN_WARNING
                               "HFC PCI: IRQ(%d) getting no interrupts "
                               "during init %d\n", hc->irq, 4 - cnt);
                        if (cnt == 1)
                                break;
                        else {
                                reset_hfcpci(hc);
                                cnt--;
                        }
                } else {
                        spin_unlock_irqrestore(&hc->lock, flags);
                        hc->initdone = 1;
                        return 0;
                }
        }
        disable_hwirq(hc);
        spin_unlock_irqrestore(&hc->lock, flags);
        free_irq(hc->irq, hc);
        return -EIO;
}

static int
channel_ctrl(struct hfc_pci *hc, struct mISDN_ctrl_req *cq)
{
        int     ret = 0;
        u_char  slot;

        switch (cq->op) {
        case MISDN_CTRL_GETOP:
                cq->op = MISDN_CTRL_LOOP | MISDN_CTRL_CONNECT |
                         MISDN_CTRL_DISCONNECT | MISDN_CTRL_L1_TIMER3;
                break;
        case MISDN_CTRL_LOOP:
                /* channel 0 disabled loop */
                if (cq->channel < 0 || cq->channel > 2) {
                        ret = -EINVAL;
                        break;
                }
                if (cq->channel & 1) {
                        if (test_bit(HFC_CFG_SW_DD_DU, &hc->cfg))
                                slot = 0xC0;
                        else
                                slot = 0x80;
                        printk(KERN_DEBUG "%s: Write_hfc: B1_SSL/RSL 0x%x\n",
                               __func__, slot);
                        Write_hfc(hc, HFCPCI_B1_SSL, slot);
                        Write_hfc(hc, HFCPCI_B1_RSL, slot);
                        hc->hw.conn = (hc->hw.conn & ~7) | 6;
                        Write_hfc(hc, HFCPCI_CONNECT, hc->hw.conn);
                }
                if (cq->channel & 2) {
                        if (test_bit(HFC_CFG_SW_DD_DU, &hc->cfg))
                                slot = 0xC1;
                        else
                                slot = 0x81;
                        printk(KERN_DEBUG "%s: Write_hfc: B2_SSL/RSL 0x%x\n",
                               __func__, slot);
                        Write_hfc(hc, HFCPCI_B2_SSL, slot);
                        Write_hfc(hc, HFCPCI_B2_RSL, slot);
                        hc->hw.conn = (hc->hw.conn & ~0x38) | 0x30;
                        Write_hfc(hc, HFCPCI_CONNECT, hc->hw.conn);
                }
                if (cq->channel & 3)
                        hc->hw.trm |= 0x80;     /* enable IOM-loop */
                else {
                        hc->hw.conn = (hc->hw.conn & ~0x3f) | 0x09;
                        Write_hfc(hc, HFCPCI_CONNECT, hc->hw.conn);
                        hc->hw.trm &= 0x7f;     /* disable IOM-loop */
                }
                Write_hfc(hc, HFCPCI_TRM, hc->hw.trm);
                break;
        case MISDN_CTRL_CONNECT:
                if (cq->channel == cq->p1) {
                        ret = -EINVAL;
                        break;
                }
                if (cq->channel < 1 || cq->channel > 2 ||
                    cq->p1 < 1 || cq->p1 > 2) {
                        ret = -EINVAL;
                        break;
                }
                if (test_bit(HFC_CFG_SW_DD_DU, &hc->cfg))
                        slot = 0xC0;
                else
                        slot = 0x80;
                printk(KERN_DEBUG "%s: Write_hfc: B1_SSL/RSL 0x%x\n",
                       __func__, slot);
                Write_hfc(hc, HFCPCI_B1_SSL, slot);
                Write_hfc(hc, HFCPCI_B2_RSL, slot);
                if (test_bit(HFC_CFG_SW_DD_DU, &hc->cfg))
                        slot = 0xC1;
                else
                        slot = 0x81;
                printk(KERN_DEBUG "%s: Write_hfc: B2_SSL/RSL 0x%x\n",
                       __func__, slot);
                Write_hfc(hc, HFCPCI_B2_SSL, slot);
                Write_hfc(hc, HFCPCI_B1_RSL, slot);
                hc->hw.conn = (hc->hw.conn & ~0x3f) | 0x36;
                Write_hfc(hc, HFCPCI_CONNECT, hc->hw.conn);
                hc->hw.trm |= 0x80;
                Write_hfc(hc, HFCPCI_TRM, hc->hw.trm);
                break;
        case MISDN_CTRL_DISCONNECT:
                hc->hw.conn = (hc->hw.conn & ~0x3f) | 0x09;
                Write_hfc(hc, HFCPCI_CONNECT, hc->hw.conn);
                hc->hw.trm &= 0x7f;     /* disable IOM-loop */
                break;
        case MISDN_CTRL_L1_TIMER3:
                ret = l1_event(hc->dch.l1, HW_TIMER3_VALUE | (cq->p1 & 0xff));
                break;
        default:
                printk(KERN_WARNING "%s: unknown Op %x\n",
                       __func__, cq->op);
                ret = -EINVAL;
                break;
        }
        return ret;
}

static int
open_dchannel(struct hfc_pci *hc, struct mISDNchannel *ch,
              struct channel_req *rq)
{
        int err = 0;

        if (debug & DEBUG_HW_OPEN)
                printk(KERN_DEBUG "%s: dev(%d) open from %p\n", __func__,
                       hc->dch.dev.id, __builtin_return_address(0));
        if (rq->protocol == ISDN_P_NONE)
                return -EINVAL;
        if (rq->adr.channel == 1) {
                /* TODO: E-Channel */
                return -EINVAL;
        }
        if (!hc->initdone) {
                if (rq->protocol == ISDN_P_TE_S0) {
                        err = create_l1(&hc->dch, hfc_l1callback);
                        if (err)
                                return err;
                }
                hc->hw.protocol = rq->protocol;
                ch->protocol = rq->protocol;
                err = init_card(hc);
                if (err)
                        return err;
        } else {
                if (rq->protocol != ch->protocol) {
                        if (hc->hw.protocol == ISDN_P_TE_S0)
                                l1_event(hc->dch.l1, CLOSE_CHANNEL);
                        if (rq->protocol == ISDN_P_TE_S0) {
                                err = create_l1(&hc->dch, hfc_l1callback);
                                if (err)
                                        return err;
                        }
                        hc->hw.protocol = rq->protocol;
                        ch->protocol = rq->protocol;
                        hfcpci_setmode(hc);
                }
        }

        if (((ch->protocol == ISDN_P_NT_S0) && (hc->dch.state == 3)) ||
            ((ch->protocol == ISDN_P_TE_S0) && (hc->dch.state == 7))) {
                _queue_data(ch, PH_ACTIVATE_IND, MISDN_ID_ANY,
                            0, NULL, GFP_KERNEL);
        }
        rq->ch = ch;
        if (!try_module_get(THIS_MODULE))
                printk(KERN_WARNING "%s:cannot get module\n", __func__);
        return 0;
}

static int
open_bchannel(struct hfc_pci *hc, struct channel_req *rq)
{
        struct bchannel         *bch;

        if (rq->adr.channel == 0 || rq->adr.channel > 2)
                return -EINVAL;
        if (rq->protocol == ISDN_P_NONE)
                return -EINVAL;
        bch = &hc->bch[rq->adr.channel - 1];
        if (test_and_set_bit(FLG_OPEN, &bch->Flags))
                return -EBUSY; /* b-channel can be only open once */
        bch->ch.protocol = rq->protocol;
        rq->ch = &bch->ch; /* TODO: E-channel */
        if (!try_module_get(THIS_MODULE))
                printk(KERN_WARNING "%s:cannot get module\n", __func__);
        return 0;
}

/*
 * device control function
 */
static int
hfc_dctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
{
        struct mISDNdevice      *dev = container_of(ch, struct mISDNdevice, D);
        struct dchannel         *dch = container_of(dev, struct dchannel, dev);
        struct hfc_pci          *hc = dch->hw;
        struct channel_req      *rq;
        int                     err = 0;

        if (dch->debug & DEBUG_HW)
                printk(KERN_DEBUG "%s: cmd:%x %p\n",
                       __func__, cmd, arg);
        switch (cmd) {
        case OPEN_CHANNEL:
                rq = arg;
                if ((rq->protocol == ISDN_P_TE_S0) ||
                    (rq->protocol == ISDN_P_NT_S0))
                        err = open_dchannel(hc, ch, rq);
                else
                        err = open_bchannel(hc, rq);
                break;
        case CLOSE_CHANNEL:
                if (debug & DEBUG_HW_OPEN)
                        printk(KERN_DEBUG "%s: dev(%d) close from %p\n",
                               __func__, hc->dch.dev.id,
                               __builtin_return_address(0));
                module_put(THIS_MODULE);
                break;
        case CONTROL_CHANNEL:
                err = channel_ctrl(hc, arg);
                break;
        default:
                if (dch->debug & DEBUG_HW)
                        printk(KERN_DEBUG "%s: unknown command %x\n",
                               __func__, cmd);
                return -EINVAL;
        }
        return err;
}

static int
setup_hw(struct hfc_pci *hc)
{
        void    *buffer;

        printk(KERN_INFO "mISDN: HFC-PCI driver %s\n", hfcpci_revision);
        hc->hw.cirm = 0;
        hc->dch.state = 0;
        pci_set_master(hc->pdev);
        if (!hc->irq) {
                printk(KERN_WARNING "HFC-PCI: No IRQ for PCI card found\n");
                return 1;
        }
        hc->hw.pci_io =
                (char __iomem *)(unsigned long)hc->pdev->resource[1].start;

        if (!hc->hw.pci_io) {
                printk(KERN_WARNING "HFC-PCI: No IO-Mem for PCI card found\n");
                return 1;
        }
        /* Allocate memory for FIFOS */
        /* the memory needs to be on a 32k boundary within the first 4G */
        pci_set_dma_mask(hc->pdev, 0xFFFF8000);
        buffer = pci_alloc_consistent(hc->pdev, 0x8000, &hc->hw.dmahandle);
        /* We silently assume the address is okay if nonzero */
        if (!buffer) {
                printk(KERN_WARNING
                       "HFC-PCI: Error allocating memory for FIFO!\n");
                return 1;
        }
        hc->hw.fifos = buffer;
        pci_write_config_dword(hc->pdev, 0x80, hc->hw.dmahandle);
        hc->hw.pci_io = ioremap((ulong) hc->hw.pci_io, 256);
        printk(KERN_INFO
               "HFC-PCI: defined at mem %#lx fifo %#lx(%#lx) IRQ %d HZ %d\n",
               (u_long) hc->hw.pci_io, (u_long) hc->hw.fifos,
               (u_long) hc->hw.dmahandle, hc->irq, HZ);
        /* enable memory mapped ports, disable busmaster */
        pci_write_config_word(hc->pdev, PCI_COMMAND, PCI_ENA_MEMIO);
        hc->hw.int_m2 = 0;
        disable_hwirq(hc);
        hc->hw.int_m1 = 0;
        Write_hfc(hc, HFCPCI_INT_M1, hc->hw.int_m1);
        /* At this point the needed PCI config is done */
        /* fifos are still not enabled */
        hc->hw.timer.function = (void *) hfcpci_Timer;
        hc->hw.timer.data = (long) hc;
        init_timer(&hc->hw.timer);
        /* default PCM master */
        test_and_set_bit(HFC_CFG_MASTER, &hc->cfg);
        return 0;
}

static void
release_card(struct hfc_pci *hc) {
        u_long  flags;

        spin_lock_irqsave(&hc->lock, flags);
        hc->hw.int_m2 = 0; /* interrupt output off ! */
        disable_hwirq(hc);
        mode_hfcpci(&hc->bch[0], 1, ISDN_P_NONE);
        mode_hfcpci(&hc->bch[1], 2, ISDN_P_NONE);
        if (hc->dch.timer.function != NULL) {
                del_timer(&hc->dch.timer);
                hc->dch.timer.function = NULL;
        }
        spin_unlock_irqrestore(&hc->lock, flags);
        if (hc->hw.protocol == ISDN_P_TE_S0)
                l1_event(hc->dch.l1, CLOSE_CHANNEL);
        if (hc->initdone)
                free_irq(hc->irq, hc);
        release_io_hfcpci(hc); /* must release after free_irq! */
        mISDN_unregister_device(&hc->dch.dev);
        mISDN_freebchannel(&hc->bch[1]);
        mISDN_freebchannel(&hc->bch[0]);
        mISDN_freedchannel(&hc->dch);
        pci_set_drvdata(hc->pdev, NULL);
        kfree(hc);
}

static int
setup_card(struct hfc_pci *card)
{
        int             err = -EINVAL;
        u_int           i;
        char            name[MISDN_MAX_IDLEN];

        card->dch.debug = debug;
        spin_lock_init(&card->lock);
        mISDN_initdchannel(&card->dch, MAX_DFRAME_LEN_L1, ph_state);
        card->dch.hw = card;
        card->dch.dev.Dprotocols = (1 << ISDN_P_TE_S0) | (1 << ISDN_P_NT_S0);
        card->dch.dev.Bprotocols = (1 << (ISDN_P_B_RAW & ISDN_P_B_MASK)) |
                (1 << (ISDN_P_B_HDLC & ISDN_P_B_MASK));
        card->dch.dev.D.send = hfcpci_l2l1D;
        card->dch.dev.D.ctrl = hfc_dctrl;
        card->dch.dev.nrbchan = 2;
        for (i = 0; i < 2; i++) {
                card->bch[i].nr = i + 1;
                set_channelmap(i + 1, card->dch.dev.channelmap);
                card->bch[i].debug = debug;
                mISDN_initbchannel(&card->bch[i], MAX_DATA_MEM, poll >> 1);
                card->bch[i].hw = card;
                card->bch[i].ch.send = hfcpci_l2l1B;
                card->bch[i].ch.ctrl = hfc_bctrl;
                card->bch[i].ch.nr = i + 1;
                list_add(&card->bch[i].ch.list, &card->dch.dev.bchannels);
        }
        err = setup_hw(card);
        if (err)
                goto error;
        snprintf(name, MISDN_MAX_IDLEN - 1, "hfc-pci.%d", HFC_cnt + 1);
        err = mISDN_register_device(&card->dch.dev, &card->pdev->dev, name);
        if (err)
                goto error;
        HFC_cnt++;
        printk(KERN_INFO "HFC %d cards installed\n", HFC_cnt);
        return 0;
error:
        mISDN_freebchannel(&card->bch[1]);
        mISDN_freebchannel(&card->bch[0]);
        mISDN_freedchannel(&card->dch);
        kfree(card);
        return err;
}

/* private data in the PCI devices list */
struct _hfc_map {
        u_int   subtype;
        u_int   flag;
        char    *name;
};

static const struct _hfc_map hfc_map[] =
{
        {HFC_CCD_2BD0, 0, "CCD/Billion/Asuscom 2BD0"},
        {HFC_CCD_B000, 0, "Billion B000"},
        {HFC_CCD_B006, 0, "Billion B006"},
        {HFC_CCD_B007, 0, "Billion B007"},
        {HFC_CCD_B008, 0, "Billion B008"},
        {HFC_CCD_B009, 0, "Billion B009"},
        {HFC_CCD_B00A, 0, "Billion B00A"},
        {HFC_CCD_B00B, 0, "Billion B00B"},
        {HFC_CCD_B00C, 0, "Billion B00C"},
        {HFC_CCD_B100, 0, "Seyeon B100"},
        {HFC_CCD_B700, 0, "Primux II S0 B700"},
        {HFC_CCD_B701, 0, "Primux II S0 NT B701"},
        {HFC_ABOCOM_2BD1, 0, "Abocom/Magitek 2BD1"},
        {HFC_ASUS_0675, 0, "Asuscom/Askey 675"},
        {HFC_BERKOM_TCONCEPT, 0, "German telekom T-Concept"},
        {HFC_BERKOM_A1T, 0, "German telekom A1T"},
        {HFC_ANIGMA_MC145575, 0, "Motorola MC145575"},
        {HFC_ZOLTRIX_2BD0, 0, "Zoltrix 2BD0"},
        {HFC_DIGI_DF_M_IOM2_E, 0,
         "Digi International DataFire Micro V IOM2 (Europe)"},
        {HFC_DIGI_DF_M_E, 0,
         "Digi International DataFire Micro V (Europe)"},
        {HFC_DIGI_DF_M_IOM2_A, 0,
         "Digi International DataFire Micro V IOM2 (North America)"},
        {HFC_DIGI_DF_M_A, 0,
         "Digi International DataFire Micro V (North America)"},
        {HFC_SITECOM_DC105V2, 0, "Sitecom Connectivity DC-105 ISDN TA"},
        {},
};

static struct pci_device_id hfc_ids[] =
{
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_2BD0),
          (unsigned long) &hfc_map[0] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B000),
          (unsigned long) &hfc_map[1] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B006),
          (unsigned long) &hfc_map[2] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B007),
          (unsigned long) &hfc_map[3] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B008),
          (unsigned long) &hfc_map[4] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B009),
          (unsigned long) &hfc_map[5] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B00A),
          (unsigned long) &hfc_map[6] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B00B),
          (unsigned long) &hfc_map[7] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B00C),
          (unsigned long) &hfc_map[8] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B100),
          (unsigned long) &hfc_map[9] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B700),
          (unsigned long) &hfc_map[10] },
        { PCI_VDEVICE(CCD, PCI_DEVICE_ID_CCD_B701),
          (unsigned long) &hfc_map[11] },
        { PCI_VDEVICE(ABOCOM, PCI_DEVICE_ID_ABOCOM_2BD1),
          (unsigned long) &hfc_map[12] },
        { PCI_VDEVICE(ASUSTEK, PCI_DEVICE_ID_ASUSTEK_0675),
          (unsigned long) &hfc_map[13] },
        { PCI_VDEVICE(BERKOM, PCI_DEVICE_ID_BERKOM_T_CONCEPT),
          (unsigned long) &hfc_map[14] },
        { PCI_VDEVICE(BERKOM, PCI_DEVICE_ID_BERKOM_A1T),
          (unsigned long) &hfc_map[15] },
        { PCI_VDEVICE(ANIGMA, PCI_DEVICE_ID_ANIGMA_MC145575),
          (unsigned long) &hfc_map[16] },
        { PCI_VDEVICE(ZOLTRIX, PCI_DEVICE_ID_ZOLTRIX_2BD0),
          (unsigned long) &hfc_map[17] },
        { PCI_VDEVICE(DIGI, PCI_DEVICE_ID_DIGI_DF_M_IOM2_E),
          (unsigned long) &hfc_map[18] },
        { PCI_VDEVICE(DIGI, PCI_DEVICE_ID_DIGI_DF_M_E),
          (unsigned long) &hfc_map[19] },
        { PCI_VDEVICE(DIGI, PCI_DEVICE_ID_DIGI_DF_M_IOM2_A),
          (unsigned long) &hfc_map[20] },
        { PCI_VDEVICE(DIGI, PCI_DEVICE_ID_DIGI_DF_M_A),
          (unsigned long) &hfc_map[21] },
        { PCI_VDEVICE(SITECOM, PCI_DEVICE_ID_SITECOM_DC105V2),
          (unsigned long) &hfc_map[22] },
        {},
};

static int
hfc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        int             err = -ENOMEM;
        struct hfc_pci  *card;
        struct _hfc_map *m = (struct _hfc_map *)ent->driver_data;

        card = kzalloc(sizeof(struct hfc_pci), GFP_ATOMIC);
        if (!card) {
                printk(KERN_ERR "No kmem for HFC card\n");
                return err;
        }
        card->pdev = pdev;
        card->subtype = m->subtype;
        err = pci_enable_device(pdev);
        if (err) {
                kfree(card);
                return err;
        }

        printk(KERN_INFO "mISDN_hfcpci: found adapter %s at %s\n",
               m->name, pci_name(pdev));

        card->irq = pdev->irq;
        pci_set_drvdata(pdev, card);
        err = setup_card(card);
        if (err)
                pci_set_drvdata(pdev, NULL);
        return err;
}

static void
hfc_remove_pci(struct pci_dev *pdev)
{
        struct hfc_pci  *card = pci_get_drvdata(pdev);

        if (card)
                release_card(card);
        else
                if (debug)
                        printk(KERN_DEBUG "%s: drvdata already removed\n",
                               __func__);
}


static struct pci_driver hfc_driver = {
        .name = "hfcpci",
        .probe = hfc_probe,
        .remove = hfc_remove_pci,
        .id_table = hfc_ids,
};

static int
_hfcpci_softirq(struct device *dev, void *arg)
{
        struct hfc_pci  *hc = dev_get_drvdata(dev);
        struct bchannel *bch;
        if (hc == NULL)
                return 0;

        if (hc->hw.int_m2 & HFCPCI_IRQ_ENABLE) {
                spin_lock(&hc->lock);
                bch = Sel_BCS(hc, hc->hw.bswapped ? 2 : 1);
                if (bch && bch->state == ISDN_P_B_RAW) { /* B1 rx&tx */
                        main_rec_hfcpci(bch);
                        tx_birq(bch);
                }
                bch = Sel_BCS(hc, hc->hw.bswapped ? 1 : 2);
                if (bch && bch->state == ISDN_P_B_RAW) { /* B2 rx&tx */
                        main_rec_hfcpci(bch);
                        tx_birq(bch);
                }
                spin_unlock(&hc->lock);
        }
        return 0;
}

static void
hfcpci_softirq(void *arg)
{
        (void) driver_for_each_device(&hfc_driver.driver, NULL, arg,
                                      _hfcpci_softirq);

        /* if next event would be in the past ... */
        if ((s32)(hfc_jiffies + tics - jiffies) <= 0)
                hfc_jiffies = jiffies + 1;
        else
                hfc_jiffies += tics;
        hfc_tl.expires = hfc_jiffies;
        add_timer(&hfc_tl);
}

static int __init
HFC_init(void)
{
        int             err;

        if (!poll)
                poll = HFCPCI_BTRANS_THRESHOLD;

        if (poll != HFCPCI_BTRANS_THRESHOLD) {
                tics = (poll * HZ) / 8000;
                if (tics < 1)
                        tics = 1;
                poll = (tics * 8000) / HZ;
                if (poll > 256 || poll < 8) {
                        printk(KERN_ERR "%s: Wrong poll value %d not in range "
                               "of 8..256.\n", __func__, poll);
                        err = -EINVAL;
                        return err;
                }
        }
        if (poll != HFCPCI_BTRANS_THRESHOLD) {
                printk(KERN_INFO "%s: Using alternative poll value of %d\n",
                       __func__, poll);
                hfc_tl.function = (void *)hfcpci_softirq;
                hfc_tl.data = 0;
                init_timer(&hfc_tl);
                hfc_tl.expires = jiffies + tics;
                hfc_jiffies = hfc_tl.expires;
                add_timer(&hfc_tl);
        } else
                tics = 0; /* indicate the use of controller's timer */

        err = pci_register_driver(&hfc_driver);
        if (err) {
                if (timer_pending(&hfc_tl))
                        del_timer(&hfc_tl);
        }

        return err;
}

static void __exit
HFC_cleanup(void)
{
        if (timer_pending(&hfc_tl))
                del_timer(&hfc_tl);

        pci_unregister_driver(&hfc_driver);
}

module_init(HFC_init);
module_exit(HFC_cleanup);

MODULE_DEVICE_TABLE(pci, hfc_ids);