// SPDX-License-Identifier: GPL-2.0-only
/*
 * isac.c   ISAC specific routines
 *
 * Author       Karsten Keil <keil@isdn4linux.de>
 *
 * Copyright 2009  by Karsten Keil <keil@isdn4linux.de>
 */

#include <linux/irqreturn.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mISDNhw.h>
#include "ipac.h"


#define DBUSY_TIMER_VALUE       80
#define ARCOFI_USE              1

#define ISAC_REV                "2.0"

MODULE_AUTHOR("Karsten Keil");
MODULE_VERSION(ISAC_REV);
MODULE_DESCRIPTION("mISDN driver for ISAC specific functions");
MODULE_LICENSE("GPL v2");

#define ReadISAC(is, o)         (is->read_reg(is->dch.hw, o + is->off))
#define WriteISAC(is, o, v)     (is->write_reg(is->dch.hw, o + is->off, v))
#define ReadHSCX(h, o)          (h->ip->read_reg(h->ip->hw, h->off + o))
#define WriteHSCX(h, o, v)      (h->ip->write_reg(h->ip->hw, h->off + o, v))
#define ReadIPAC(ip, o)         (ip->read_reg(ip->hw, o))
#define WriteIPAC(ip, o, v)     (ip->write_reg(ip->hw, o, v))

static inline void
ph_command(struct isac_hw *isac, u8 command)
{
        pr_debug("%s: ph_command %x\n", isac->name, command);
        if (isac->type & IPAC_TYPE_ISACX)
                WriteISAC(isac, ISACX_CIX0, (command << 4) | 0xE);
        else
                WriteISAC(isac, ISAC_CIX0, (command << 2) | 3);
}

static void
isac_ph_state_change(struct isac_hw *isac)
{
        switch (isac->state) {
        case (ISAC_IND_RS):
        case (ISAC_IND_EI):
                ph_command(isac, ISAC_CMD_DUI);
        }
        schedule_event(&isac->dch, FLG_PHCHANGE);
}

static void
isac_ph_state_bh(struct dchannel *dch)
{
        struct isac_hw *isac = container_of(dch, struct isac_hw, dch);

        switch (isac->state) {
        case ISAC_IND_RS:
        case ISAC_IND_EI:
                dch->state = 0;
                l1_event(dch->l1, HW_RESET_IND);
                break;
        case ISAC_IND_DID:
                dch->state = 3;
                l1_event(dch->l1, HW_DEACT_CNF);
                break;
        case ISAC_IND_DR:
        case ISAC_IND_DR6:
                dch->state = 3;
                l1_event(dch->l1, HW_DEACT_IND);
                break;
        case ISAC_IND_PU:
                dch->state = 4;
                l1_event(dch->l1, HW_POWERUP_IND);
                break;
        case ISAC_IND_RSY:
                if (dch->state <= 5) {
                        dch->state = 5;
                        l1_event(dch->l1, ANYSIGNAL);
                } else {
                        dch->state = 8;
                        l1_event(dch->l1, LOSTFRAMING);
                }
                break;
        case ISAC_IND_ARD:
                dch->state = 6;
                l1_event(dch->l1, INFO2);
                break;
        case ISAC_IND_AI8:
                dch->state = 7;
                l1_event(dch->l1, INFO4_P8);
                break;
        case ISAC_IND_AI10:
                dch->state = 7;
                l1_event(dch->l1, INFO4_P10);
                break;
        }
        pr_debug("%s: TE newstate %x\n", isac->name, dch->state);
}

static void
isac_empty_fifo(struct isac_hw *isac, int count)
{
        u8 *ptr;

        pr_debug("%s: %s  %d\n", isac->name, __func__, count);

        if (!isac->dch.rx_skb) {
                isac->dch.rx_skb = mI_alloc_skb(isac->dch.maxlen, GFP_ATOMIC);
                if (!isac->dch.rx_skb) {
                        pr_info("%s: D receive out of memory\n", isac->name);
                        WriteISAC(isac, ISAC_CMDR, 0x80);
                        return;
                }
        }
        if ((isac->dch.rx_skb->len + count) >= isac->dch.maxlen) {
                pr_debug("%s: %s overrun %d\n", isac->name, __func__,
                         isac->dch.rx_skb->len + count);
                WriteISAC(isac, ISAC_CMDR, 0x80);
                return;
        }
        ptr = skb_put(isac->dch.rx_skb, count);
        isac->read_fifo(isac->dch.hw, isac->off, ptr, count);
        WriteISAC(isac, ISAC_CMDR, 0x80);
        if (isac->dch.debug & DEBUG_HW_DFIFO) {
                char    pfx[MISDN_MAX_IDLEN + 16];

                snprintf(pfx, MISDN_MAX_IDLEN + 15, "D-recv %s %d ",
                         isac->name, count);
                print_hex_dump_bytes(pfx, DUMP_PREFIX_OFFSET, ptr, count);
        }
}

static void
isac_fill_fifo(struct isac_hw *isac)
{
        int count, more;
        u8 *ptr;

        if (!isac->dch.tx_skb)
                return;
        count = isac->dch.tx_skb->len - isac->dch.tx_idx;
        if (count <= 0)
                return;

        more = 0;
        if (count > 32) {
                more = !0;
                count = 32;
        }
        pr_debug("%s: %s  %d\n", isac->name, __func__, count);
        ptr = isac->dch.tx_skb->data + isac->dch.tx_idx;
        isac->dch.tx_idx += count;
        isac->write_fifo(isac->dch.hw, isac->off, ptr, count);
        WriteISAC(isac, ISAC_CMDR, more ? 0x8 : 0xa);
        if (test_and_set_bit(FLG_BUSY_TIMER, &isac->dch.Flags)) {
                pr_debug("%s: %s dbusytimer running\n", isac->name, __func__);
                timer_delete(&isac->dch.timer);
        }
        isac->dch.timer.expires = jiffies + ((DBUSY_TIMER_VALUE * HZ)/1000);
        add_timer(&isac->dch.timer);
        if (isac->dch.debug & DEBUG_HW_DFIFO) {
                char    pfx[MISDN_MAX_IDLEN + 16];

                snprintf(pfx, MISDN_MAX_IDLEN + 15, "D-send %s %d ",
                         isac->name, count);
                print_hex_dump_bytes(pfx, DUMP_PREFIX_OFFSET, ptr, count);
        }
}

static void
isac_rme_irq(struct isac_hw *isac)
{
        u8 val, count;

        val = ReadISAC(isac, ISAC_RSTA);
        if ((val & 0x70) != 0x20) {
                if (val & 0x40) {
                        pr_debug("%s: ISAC RDO\n", isac->name);
#ifdef ERROR_STATISTIC
                        isac->dch.err_rx++;
#endif
                }
                if (!(val & 0x20)) {
                        pr_debug("%s: ISAC CRC error\n", isac->name);
#ifdef ERROR_STATISTIC
                        isac->dch.err_crc++;
#endif
                }
                WriteISAC(isac, ISAC_CMDR, 0x80);
                dev_kfree_skb(isac->dch.rx_skb);
                isac->dch.rx_skb = NULL;
        } else {
                count = ReadISAC(isac, ISAC_RBCL) & 0x1f;
                if (count == 0)
                        count = 32;
                isac_empty_fifo(isac, count);
                recv_Dchannel(&isac->dch);
        }
}

static void
isac_xpr_irq(struct isac_hw *isac)
{
        if (test_and_clear_bit(FLG_BUSY_TIMER, &isac->dch.Flags))
                timer_delete(&isac->dch.timer);
        if (isac->dch.tx_skb && isac->dch.tx_idx < isac->dch.tx_skb->len) {
                isac_fill_fifo(isac);
        } else {
                dev_kfree_skb(isac->dch.tx_skb);
                if (get_next_dframe(&isac->dch))
                        isac_fill_fifo(isac);
        }
}

static void
isac_retransmit(struct isac_hw *isac)
{
        if (test_and_clear_bit(FLG_BUSY_TIMER, &isac->dch.Flags))
                timer_delete(&isac->dch.timer);
        if (test_bit(FLG_TX_BUSY, &isac->dch.Flags)) {
                /* Restart frame */
                isac->dch.tx_idx = 0;
                isac_fill_fifo(isac);
        } else if (isac->dch.tx_skb) { /* should not happen */
                pr_info("%s: tx_skb exist but not busy\n", isac->name);
                test_and_set_bit(FLG_TX_BUSY, &isac->dch.Flags);
                isac->dch.tx_idx = 0;
                isac_fill_fifo(isac);
        } else {
                pr_info("%s: ISAC XDU no TX_BUSY\n", isac->name);
                if (get_next_dframe(&isac->dch))
                        isac_fill_fifo(isac);
        }
}

static void
isac_mos_irq(struct isac_hw *isac)
{
        u8 val;
        int ret;

        val = ReadISAC(isac, ISAC_MOSR);
        pr_debug("%s: ISAC MOSR %02x\n", isac->name, val);
#if ARCOFI_USE
        if (val & 0x08) {
                if (!isac->mon_rx) {
                        isac->mon_rx = kmalloc(MAX_MON_FRAME, GFP_ATOMIC);
                        if (!isac->mon_rx) {
                                pr_info("%s: ISAC MON RX out of memory!\n",
                                        isac->name);
                                isac->mocr &= 0xf0;
                                isac->mocr |= 0x0a;
                                WriteISAC(isac, ISAC_MOCR, isac->mocr);
                                goto afterMONR0;
                        } else
                                isac->mon_rxp = 0;
                }
                if (isac->mon_rxp >= MAX_MON_FRAME) {
                        isac->mocr &= 0xf0;
                        isac->mocr |= 0x0a;
                        WriteISAC(isac, ISAC_MOCR, isac->mocr);
                        isac->mon_rxp = 0;
                        pr_debug("%s: ISAC MON RX overflow!\n", isac->name);
                        goto afterMONR0;
                }
                isac->mon_rx[isac->mon_rxp++] = ReadISAC(isac, ISAC_MOR0);
                pr_debug("%s: ISAC MOR0 %02x\n", isac->name,
                         isac->mon_rx[isac->mon_rxp - 1]);
                if (isac->mon_rxp == 1) {
                        isac->mocr |= 0x04;
                        WriteISAC(isac, ISAC_MOCR, isac->mocr);
                }
        }
afterMONR0:
        if (val & 0x80) {
                if (!isac->mon_rx) {
                        isac->mon_rx = kmalloc(MAX_MON_FRAME, GFP_ATOMIC);
                        if (!isac->mon_rx) {
                                pr_info("%s: ISAC MON RX out of memory!\n",
                                        isac->name);
                                isac->mocr &= 0x0f;
                                isac->mocr |= 0xa0;
                                WriteISAC(isac, ISAC_MOCR, isac->mocr);
                                goto afterMONR1;
                        } else
                                isac->mon_rxp = 0;
                }
                if (isac->mon_rxp >= MAX_MON_FRAME) {
                        isac->mocr &= 0x0f;
                        isac->mocr |= 0xa0;
                        WriteISAC(isac, ISAC_MOCR, isac->mocr);
                        isac->mon_rxp = 0;
                        pr_debug("%s: ISAC MON RX overflow!\n", isac->name);
                        goto afterMONR1;
                }
                isac->mon_rx[isac->mon_rxp++] = ReadISAC(isac, ISAC_MOR1);
                pr_debug("%s: ISAC MOR1 %02x\n", isac->name,
                         isac->mon_rx[isac->mon_rxp - 1]);
                isac->mocr |= 0x40;
                WriteISAC(isac, ISAC_MOCR, isac->mocr);
        }
afterMONR1:
        if (val & 0x04) {
                isac->mocr &= 0xf0;
                WriteISAC(isac, ISAC_MOCR, isac->mocr);
                isac->mocr |= 0x0a;
                WriteISAC(isac, ISAC_MOCR, isac->mocr);
                if (isac->monitor) {
                        ret = isac->monitor(isac->dch.hw, MONITOR_RX_0,
                                            isac->mon_rx, isac->mon_rxp);
                        if (ret)
                                kfree(isac->mon_rx);
                } else {
                        pr_info("%s: MONITOR 0 received %d but no user\n",
                                isac->name, isac->mon_rxp);
                        kfree(isac->mon_rx);
                }
                isac->mon_rx = NULL;
                isac->mon_rxp = 0;
        }
        if (val & 0x40) {
                isac->mocr &= 0x0f;
                WriteISAC(isac, ISAC_MOCR, isac->mocr);
                isac->mocr |= 0xa0;
                WriteISAC(isac, ISAC_MOCR, isac->mocr);
                if (isac->monitor) {
                        ret = isac->monitor(isac->dch.hw, MONITOR_RX_1,
                                            isac->mon_rx, isac->mon_rxp);
                        if (ret)
                                kfree(isac->mon_rx);
                } else {
                        pr_info("%s: MONITOR 1 received %d but no user\n",
                                isac->name, isac->mon_rxp);
                        kfree(isac->mon_rx);
                }
                isac->mon_rx = NULL;
                isac->mon_rxp = 0;
        }
        if (val & 0x02) {
                if ((!isac->mon_tx) || (isac->mon_txc &&
                                        (isac->mon_txp >= isac->mon_txc) && !(val & 0x08))) {
                        isac->mocr &= 0xf0;
                        WriteISAC(isac, ISAC_MOCR, isac->mocr);
                        isac->mocr |= 0x0a;
                        WriteISAC(isac, ISAC_MOCR, isac->mocr);
                        if (isac->mon_txc && (isac->mon_txp >= isac->mon_txc)) {
                                if (isac->monitor)
                                        isac->monitor(isac->dch.hw,
                                                      MONITOR_TX_0, NULL, 0);
                        }
                        kfree(isac->mon_tx);
                        isac->mon_tx = NULL;
                        isac->mon_txc = 0;
                        isac->mon_txp = 0;
                        goto AfterMOX0;
                }
                if (isac->mon_txc && (isac->mon_txp >= isac->mon_txc)) {
                        if (isac->monitor)
                                isac->monitor(isac->dch.hw,
                                              MONITOR_TX_0, NULL, 0);
                        kfree(isac->mon_tx);
                        isac->mon_tx = NULL;
                        isac->mon_txc = 0;
                        isac->mon_txp = 0;
                        goto AfterMOX0;
                }
                WriteISAC(isac, ISAC_MOX0, isac->mon_tx[isac->mon_txp++]);
                pr_debug("%s: ISAC %02x -> MOX0\n", isac->name,
                         isac->mon_tx[isac->mon_txp - 1]);
        }
AfterMOX0:
        if (val & 0x20) {
                if ((!isac->mon_tx) || (isac->mon_txc &&
                                        (isac->mon_txp >= isac->mon_txc) && !(val & 0x80))) {
                        isac->mocr &= 0x0f;
                        WriteISAC(isac, ISAC_MOCR, isac->mocr);
                        isac->mocr |= 0xa0;
                        WriteISAC(isac, ISAC_MOCR, isac->mocr);
                        if (isac->mon_txc && (isac->mon_txp >= isac->mon_txc)) {
                                if (isac->monitor)
                                        isac->monitor(isac->dch.hw,
                                                      MONITOR_TX_1, NULL, 0);
                        }
                        kfree(isac->mon_tx);
                        isac->mon_tx = NULL;
                        isac->mon_txc = 0;
                        isac->mon_txp = 0;
                        goto AfterMOX1;
                }
                if (isac->mon_txc && (isac->mon_txp >= isac->mon_txc)) {
                        if (isac->monitor)
                                isac->monitor(isac->dch.hw,
                                              MONITOR_TX_1, NULL, 0);
                        kfree(isac->mon_tx);
                        isac->mon_tx = NULL;
                        isac->mon_txc = 0;
                        isac->mon_txp = 0;
                        goto AfterMOX1;
                }
                WriteISAC(isac, ISAC_MOX1, isac->mon_tx[isac->mon_txp++]);
                pr_debug("%s: ISAC %02x -> MOX1\n", isac->name,
                         isac->mon_tx[isac->mon_txp - 1]);
        }
AfterMOX1:
        val = 0; /* dummy to avoid warning */
#endif
}

static void
isac_cisq_irq(struct isac_hw *isac) {
        u8 val;

        val = ReadISAC(isac, ISAC_CIR0);
        pr_debug("%s: ISAC CIR0 %02X\n", isac->name, val);
        if (val & 2) {
                pr_debug("%s: ph_state change %x->%x\n", isac->name,
                         isac->state, (val >> 2) & 0xf);
                isac->state = (val >> 2) & 0xf;
                isac_ph_state_change(isac);
        }
        if (val & 1) {
                val = ReadISAC(isac, ISAC_CIR1);
                pr_debug("%s: ISAC CIR1 %02X\n", isac->name, val);
        }
}

static void
isacsx_cic_irq(struct isac_hw *isac)
{
        u8 val;

        val = ReadISAC(isac, ISACX_CIR0);
        pr_debug("%s: ISACX CIR0 %02X\n", isac->name, val);
        if (val & ISACX_CIR0_CIC0) {
                pr_debug("%s: ph_state change %x->%x\n", isac->name,
                         isac->state, val >> 4);
                isac->state = val >> 4;
                isac_ph_state_change(isac);
        }
}

static void
isacsx_rme_irq(struct isac_hw *isac)
{
        int count;
        u8 val;

        val = ReadISAC(isac, ISACX_RSTAD);
        if ((val & (ISACX_RSTAD_VFR |
                    ISACX_RSTAD_RDO |
                    ISACX_RSTAD_CRC |
                    ISACX_RSTAD_RAB))
            != (ISACX_RSTAD_VFR | ISACX_RSTAD_CRC)) {
                pr_debug("%s: RSTAD %#x, dropped\n", isac->name, val);
#ifdef ERROR_STATISTIC
                if (val & ISACX_RSTAD_CRC)
                        isac->dch.err_rx++;
                else
                        isac->dch.err_crc++;
#endif
                WriteISAC(isac, ISACX_CMDRD, ISACX_CMDRD_RMC);
                dev_kfree_skb(isac->dch.rx_skb);
                isac->dch.rx_skb = NULL;
        } else {
                count = ReadISAC(isac, ISACX_RBCLD) & 0x1f;
                if (count == 0)
                        count = 32;
                isac_empty_fifo(isac, count);
                if (isac->dch.rx_skb) {
                        skb_trim(isac->dch.rx_skb, isac->dch.rx_skb->len - 1);
                        pr_debug("%s: dchannel received %d\n", isac->name,
                                 isac->dch.rx_skb->len);
                        recv_Dchannel(&isac->dch);
                }
        }
}

irqreturn_t
mISDNisac_irq(struct isac_hw *isac, u8 val)
{
        if (unlikely(!val))
                return IRQ_NONE;
        pr_debug("%s: ISAC interrupt %02x\n", isac->name, val);
        if (isac->type & IPAC_TYPE_ISACX) {
                if (val & ISACX__CIC)
                        isacsx_cic_irq(isac);
                if (val & ISACX__ICD) {
                        val = ReadISAC(isac, ISACX_ISTAD);
                        pr_debug("%s: ISTAD %02x\n", isac->name, val);
                        if (val & ISACX_D_XDU) {
                                pr_debug("%s: ISAC XDU\n", isac->name);
#ifdef ERROR_STATISTIC
                                isac->dch.err_tx++;
#endif
                                isac_retransmit(isac);
                        }
                        if (val & ISACX_D_XMR) {
                                pr_debug("%s: ISAC XMR\n", isac->name);
#ifdef ERROR_STATISTIC
                                isac->dch.err_tx++;
#endif
                                isac_retransmit(isac);
                        }
                        if (val & ISACX_D_XPR)
                                isac_xpr_irq(isac);
                        if (val & ISACX_D_RFO) {
                                pr_debug("%s: ISAC RFO\n", isac->name);
                                WriteISAC(isac, ISACX_CMDRD, ISACX_CMDRD_RMC);
                        }
                        if (val & ISACX_D_RME)
                                isacsx_rme_irq(isac);
                        if (val & ISACX_D_RPF)
                                isac_empty_fifo(isac, 0x20);
                }
        } else {
                if (val & 0x80) /* RME */
                        isac_rme_irq(isac);
                if (val & 0x40) /* RPF */
                        isac_empty_fifo(isac, 32);
                if (val & 0x10) /* XPR */
                        isac_xpr_irq(isac);
                if (val & 0x04) /* CISQ */
                        isac_cisq_irq(isac);
                if (val & 0x20) /* RSC - never */
                        pr_debug("%s: ISAC RSC interrupt\n", isac->name);
                if (val & 0x02) /* SIN - never */
                        pr_debug("%s: ISAC SIN interrupt\n", isac->name);
                if (val & 0x01) {       /* EXI */
                        val = ReadISAC(isac, ISAC_EXIR);
                        pr_debug("%s: ISAC EXIR %02x\n", isac->name, val);
                        if (val & 0x80) /* XMR */
                                pr_debug("%s: ISAC XMR\n", isac->name);
                        if (val & 0x40) { /* XDU */
                                pr_debug("%s: ISAC XDU\n", isac->name);
#ifdef ERROR_STATISTIC
                                isac->dch.err_tx++;
#endif
                                isac_retransmit(isac);
                        }
                        if (val & 0x04) /* MOS */
                                isac_mos_irq(isac);
                }
        }
        return IRQ_HANDLED;
}
EXPORT_SYMBOL(mISDNisac_irq);

static int
isac_l1hw(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 isac_hw          *isac = container_of(dch, struct isac_hw, dch);
        int                     ret = -EINVAL;
        struct mISDNhead        *hh = mISDN_HEAD_P(skb);
        u32                     id;
        u_long                  flags;

        switch (hh->prim) {
        case PH_DATA_REQ:
                spin_lock_irqsave(isac->hwlock, flags);
                ret = dchannel_senddata(dch, skb);
                if (ret > 0) { /* direct TX */
                        id = hh->id; /* skb can be freed */
                        isac_fill_fifo(isac);
                        ret = 0;
                        spin_unlock_irqrestore(isac->hwlock, flags);
                        queue_ch_frame(ch, PH_DATA_CNF, id, NULL);
                } else
                        spin_unlock_irqrestore(isac->hwlock, flags);
                return ret;
        case PH_ACTIVATE_REQ:
                ret = l1_event(dch->l1, hh->prim);
                break;
        case PH_DEACTIVATE_REQ:
                test_and_clear_bit(FLG_L2_ACTIVATED, &dch->Flags);
                ret = l1_event(dch->l1, hh->prim);
                break;
        }

        if (!ret)
                dev_kfree_skb(skb);
        return ret;
}

static int
isac_ctrl(struct isac_hw *isac, u32 cmd, unsigned long para)
{
        u8 tl = 0;
        unsigned long flags;
        int ret = 0;

        switch (cmd) {
        case HW_TESTLOOP:
                spin_lock_irqsave(isac->hwlock, flags);
                if (!(isac->type & IPAC_TYPE_ISACX)) {
                        /* TODO: implement for IPAC_TYPE_ISACX */
                        if (para & 1) /* B1 */
                                tl |= 0x0c;
                        else if (para & 2) /* B2 */
                                tl |= 0x3;
                        /* we only support IOM2 mode */
                        WriteISAC(isac, ISAC_SPCR, tl);
                        if (tl)
                                WriteISAC(isac, ISAC_ADF1, 0x8);
                        else
                                WriteISAC(isac, ISAC_ADF1, 0x0);
                }
                spin_unlock_irqrestore(isac->hwlock, flags);
                break;
        case HW_TIMER3_VALUE:
                ret = l1_event(isac->dch.l1, HW_TIMER3_VALUE | (para & 0xff));
                break;
        default:
                pr_debug("%s: %s unknown command %x %lx\n", isac->name,
                         __func__, cmd, para);
                ret = -1;
        }
        return ret;
}

static int
isac_l1cmd(struct dchannel *dch, u32 cmd)
{
        struct isac_hw *isac = container_of(dch, struct isac_hw, dch);
        u_long flags;

        pr_debug("%s: cmd(%x) state(%02x)\n", isac->name, cmd, isac->state);
        switch (cmd) {
        case INFO3_P8:
                spin_lock_irqsave(isac->hwlock, flags);
                ph_command(isac, ISAC_CMD_AR8);
                spin_unlock_irqrestore(isac->hwlock, flags);
                break;
        case INFO3_P10:
                spin_lock_irqsave(isac->hwlock, flags);
                ph_command(isac, ISAC_CMD_AR10);
                spin_unlock_irqrestore(isac->hwlock, flags);
                break;
        case HW_RESET_REQ:
                spin_lock_irqsave(isac->hwlock, flags);
                if ((isac->state == ISAC_IND_EI) ||
                    (isac->state == ISAC_IND_DR) ||
                    (isac->state == ISAC_IND_DR6) ||
                    (isac->state == ISAC_IND_RS))
                        ph_command(isac, ISAC_CMD_TIM);
                else
                        ph_command(isac, ISAC_CMD_RS);
                spin_unlock_irqrestore(isac->hwlock, flags);
                break;
        case HW_DEACT_REQ:
                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))
                        timer_delete(&dch->timer);
                break;
        case HW_POWERUP_REQ:
                spin_lock_irqsave(isac->hwlock, flags);
                ph_command(isac, ISAC_CMD_TIM);
                spin_unlock_irqrestore(isac->hwlock, flags);
                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:
                pr_debug("%s: %s unknown command %x\n", isac->name,
                         __func__, cmd);
                return -1;
        }
        return 0;
}

static void
isac_release(struct isac_hw *isac)
{
        if (isac->type & IPAC_TYPE_ISACX)
                WriteISAC(isac, ISACX_MASK, 0xff);
        else if (isac->type != 0)
                WriteISAC(isac, ISAC_MASK, 0xff);
        if (isac->dch.timer.function != NULL) {
                timer_delete(&isac->dch.timer);
                isac->dch.timer.function = NULL;
        }
        kfree(isac->mon_rx);
        isac->mon_rx = NULL;
        kfree(isac->mon_tx);
        isac->mon_tx = NULL;
        if (isac->dch.l1)
                l1_event(isac->dch.l1, CLOSE_CHANNEL);
        mISDN_freedchannel(&isac->dch);
}

static void
dbusy_timer_handler(struct timer_list *t)
{
        struct isac_hw *isac = timer_container_of(isac, t, dch.timer);
        int rbch, star;
        u_long flags;

        if (test_bit(FLG_BUSY_TIMER, &isac->dch.Flags)) {
                spin_lock_irqsave(isac->hwlock, flags);
                rbch = ReadISAC(isac, ISAC_RBCH);
                star = ReadISAC(isac, ISAC_STAR);
                pr_debug("%s: D-Channel Busy RBCH %02x STAR %02x\n",
                         isac->name, rbch, star);
                if (rbch & ISAC_RBCH_XAC) /* D-Channel Busy */
                        test_and_set_bit(FLG_L1_BUSY, &isac->dch.Flags);
                else {
                        /* discard frame; reset transceiver */
                        test_and_clear_bit(FLG_BUSY_TIMER, &isac->dch.Flags);
                        if (isac->dch.tx_idx)
                                isac->dch.tx_idx = 0;
                        else
                                pr_info("%s: ISAC D-Channel Busy no tx_idx\n",
                                        isac->name);
                        /* Transmitter reset */
                        WriteISAC(isac, ISAC_CMDR, 0x01);
                }
                spin_unlock_irqrestore(isac->hwlock, flags);
        }
}

static int
open_dchannel_caller(struct isac_hw *isac, struct channel_req *rq, void *caller)
{
        pr_debug("%s: %s dev(%d) open from %p\n", isac->name, __func__,
                 isac->dch.dev.id, caller);
        if (rq->protocol != ISDN_P_TE_S0)
                return -EINVAL;
        if (rq->adr.channel == 1)
                /* E-Channel not supported */
                return -EINVAL;
        rq->ch = &isac->dch.dev.D;
        rq->ch->protocol = rq->protocol;
        if (isac->dch.state == 7)
                _queue_data(rq->ch, PH_ACTIVATE_IND, MISDN_ID_ANY,
                            0, NULL, GFP_KERNEL);
        return 0;
}

static int
open_dchannel(struct isac_hw *isac, struct channel_req *rq)
{
        return open_dchannel_caller(isac, rq, __builtin_return_address(0));
}

static const char *ISACVer[] =
{"2086/2186 V1.1", "2085 B1", "2085 B2",
 "2085 V2.3"};

static int
isac_init(struct isac_hw *isac)
{
        u8 val;
        int err = 0;

        if (!isac->dch.l1) {
                err = create_l1(&isac->dch, isac_l1cmd);
                if (err)
                        return err;
        }
        isac->mon_tx = NULL;
        isac->mon_rx = NULL;
        timer_setup(&isac->dch.timer, dbusy_timer_handler, 0);
        isac->mocr = 0xaa;
        if (isac->type & IPAC_TYPE_ISACX) {
                /* Disable all IRQ */
                WriteISAC(isac, ISACX_MASK, 0xff);
                val = ReadISAC(isac, ISACX_STARD);
                pr_debug("%s: ISACX STARD %x\n", isac->name, val);
                val = ReadISAC(isac, ISACX_ISTAD);
                pr_debug("%s: ISACX ISTAD %x\n", isac->name, val);
                val = ReadISAC(isac, ISACX_ISTA);
                pr_debug("%s: ISACX ISTA %x\n", isac->name, val);
                /* clear LDD */
                WriteISAC(isac, ISACX_TR_CONF0, 0x00);
                /* enable transmitter */
                WriteISAC(isac, ISACX_TR_CONF2, 0x00);
                /* transparent mode 0, RAC, stop/go */
                WriteISAC(isac, ISACX_MODED, 0xc9);
                /* all HDLC IRQ unmasked */
                val = ReadISAC(isac, ISACX_ID);
                if (isac->dch.debug & DEBUG_HW)
                        pr_notice("%s: ISACX Design ID %x\n",
                                  isac->name, val & 0x3f);
                val = ReadISAC(isac, ISACX_CIR0);
                pr_debug("%s: ISACX CIR0 %02X\n", isac->name, val);
                isac->state = val >> 4;
                isac_ph_state_change(isac);
                ph_command(isac, ISAC_CMD_RS);
                WriteISAC(isac, ISACX_MASK, IPACX__ON);
                WriteISAC(isac, ISACX_MASKD, 0x00);
        } else { /* old isac */
                WriteISAC(isac, ISAC_MASK, 0xff);
                val = ReadISAC(isac, ISAC_STAR);
                pr_debug("%s: ISAC STAR %x\n", isac->name, val);
                val = ReadISAC(isac, ISAC_MODE);
                pr_debug("%s: ISAC MODE %x\n", isac->name, val);
                val = ReadISAC(isac, ISAC_ADF2);
                pr_debug("%s: ISAC ADF2 %x\n", isac->name, val);
                val = ReadISAC(isac, ISAC_ISTA);
                pr_debug("%s: ISAC ISTA %x\n", isac->name, val);
                if (val & 0x01) {
                        val = ReadISAC(isac, ISAC_EXIR);
                        pr_debug("%s: ISAC EXIR %x\n", isac->name, val);
                }
                val = ReadISAC(isac, ISAC_RBCH);
                if (isac->dch.debug & DEBUG_HW)
                        pr_notice("%s: ISAC version (%x): %s\n", isac->name,
                                  val, ISACVer[(val >> 5) & 3]);
                isac->type |= ((val >> 5) & 3);
                if (!isac->adf2)
                        isac->adf2 = 0x80;
                if (!(isac->adf2 & 0x80)) { /* only IOM 2 Mode */
                        pr_info("%s: only support IOM2 mode but adf2=%02x\n",
                                isac->name, isac->adf2);
                        isac_release(isac);
                        return -EINVAL;
                }
                WriteISAC(isac, ISAC_ADF2, isac->adf2);
                WriteISAC(isac, ISAC_SQXR, 0x2f);
                WriteISAC(isac, ISAC_SPCR, 0x00);
                WriteISAC(isac, ISAC_STCR, 0x70);
                WriteISAC(isac, ISAC_MODE, 0xc9);
                WriteISAC(isac, ISAC_TIMR, 0x00);
                WriteISAC(isac, ISAC_ADF1, 0x00);
                val = ReadISAC(isac, ISAC_CIR0);
                pr_debug("%s: ISAC CIR0 %x\n", isac->name, val);
                isac->state = (val >> 2) & 0xf;
                isac_ph_state_change(isac);
                ph_command(isac, ISAC_CMD_RS);
                WriteISAC(isac, ISAC_MASK, 0);
        }
        return err;
}

int
mISDNisac_init(struct isac_hw *isac, void *hw)
{
        mISDN_initdchannel(&isac->dch, MAX_DFRAME_LEN_L1, isac_ph_state_bh);
        isac->dch.hw = hw;
        isac->dch.dev.D.send = isac_l1hw;
        isac->init = isac_init;
        isac->release = isac_release;
        isac->ctrl = isac_ctrl;
        isac->open = open_dchannel;
        isac->dch.dev.Dprotocols = (1 << ISDN_P_TE_S0);
        isac->dch.dev.nrbchan = 2;
        return 0;
}
EXPORT_SYMBOL(mISDNisac_init);

static void
waitforCEC(struct hscx_hw *hx)
{
        u8 starb, to = 50;

        while (to) {
                starb = ReadHSCX(hx, IPAC_STARB);
                if (!(starb & 0x04))
                        break;
                udelay(1);
                to--;
        }
        if (to < 50)
                pr_debug("%s: B%1d CEC %d us\n", hx->ip->name, hx->bch.nr,
                         50 - to);
        if (!to)
                pr_info("%s: B%1d CEC timeout\n", hx->ip->name, hx->bch.nr);
}


static void
waitforXFW(struct hscx_hw *hx)
{
        u8 starb, to = 50;

        while (to) {
                starb = ReadHSCX(hx, IPAC_STARB);
                if ((starb & 0x44) == 0x40)
                        break;
                udelay(1);
                to--;
        }
        if (to < 50)
                pr_debug("%s: B%1d XFW %d us\n", hx->ip->name, hx->bch.nr,
                         50 - to);
        if (!to)
                pr_info("%s: B%1d XFW timeout\n", hx->ip->name, hx->bch.nr);
}

static void
hscx_cmdr(struct hscx_hw *hx, u8 cmd)
{
        if (hx->ip->type & IPAC_TYPE_IPACX)
                WriteHSCX(hx, IPACX_CMDRB, cmd);
        else {
                waitforCEC(hx);
                WriteHSCX(hx, IPAC_CMDRB, cmd);
        }
}

static void
hscx_empty_fifo(struct hscx_hw *hscx, u8 count)
{
        u8 *p;
        int maxlen;

        pr_debug("%s: B%1d %d\n", hscx->ip->name, hscx->bch.nr, count);
        if (test_bit(FLG_RX_OFF, &hscx->bch.Flags)) {
                hscx->bch.dropcnt += count;
                hscx_cmdr(hscx, 0x80); /* RMC */
                return;
        }
        maxlen = bchannel_get_rxbuf(&hscx->bch, count);
        if (maxlen < 0) {
                hscx_cmdr(hscx, 0x80); /* RMC */
                if (hscx->bch.rx_skb)
                        skb_trim(hscx->bch.rx_skb, 0);
                pr_warn("%s.B%d: No bufferspace for %d bytes\n",
                        hscx->ip->name, hscx->bch.nr, count);
                return;
        }
        p = skb_put(hscx->bch.rx_skb, count);

        if (hscx->ip->type & IPAC_TYPE_IPACX)
                hscx->ip->read_fifo(hscx->ip->hw,
                                    hscx->off + IPACX_RFIFOB, p, count);
        else
                hscx->ip->read_fifo(hscx->ip->hw,
                                    hscx->off, p, count);

        hscx_cmdr(hscx, 0x80); /* RMC */

        if (hscx->bch.debug & DEBUG_HW_BFIFO) {
                snprintf(hscx->log, 64, "B%1d-recv %s %d ",
                         hscx->bch.nr, hscx->ip->name, count);
                print_hex_dump_bytes(hscx->log, DUMP_PREFIX_OFFSET, p, count);
        }
}

static void
hscx_fill_fifo(struct hscx_hw *hscx)
{
        int count, more;
        u8 *p;

        if (!hscx->bch.tx_skb) {
                if (!test_bit(FLG_TX_EMPTY, &hscx->bch.Flags))
                        return;
                count = hscx->fifo_size;
                more = 1;
                p = hscx->log;
                memset(p, hscx->bch.fill[0], count);
        } else {
                count = hscx->bch.tx_skb->len - hscx->bch.tx_idx;
                if (count <= 0)
                        return;
                p = hscx->bch.tx_skb->data + hscx->bch.tx_idx;

                more = test_bit(FLG_TRANSPARENT, &hscx->bch.Flags) ? 1 : 0;
                if (count > hscx->fifo_size) {
                        count = hscx->fifo_size;
                        more = 1;
                }
                pr_debug("%s: B%1d %d/%d/%d\n", hscx->ip->name, hscx->bch.nr,
                         count, hscx->bch.tx_idx, hscx->bch.tx_skb->len);
                hscx->bch.tx_idx += count;
        }
        if (hscx->ip->type & IPAC_TYPE_IPACX)
                hscx->ip->write_fifo(hscx->ip->hw,
                                     hscx->off + IPACX_XFIFOB, p, count);
        else {
                waitforXFW(hscx);
                hscx->ip->write_fifo(hscx->ip->hw,
                                     hscx->off, p, count);
        }
        hscx_cmdr(hscx, more ? 0x08 : 0x0a);

        if (hscx->bch.tx_skb && (hscx->bch.debug & DEBUG_HW_BFIFO)) {
                snprintf(hscx->log, 64, "B%1d-send %s %d ",
                         hscx->bch.nr, hscx->ip->name, count);
                print_hex_dump_bytes(hscx->log, DUMP_PREFIX_OFFSET, p, count);
        }
}

static void
hscx_xpr(struct hscx_hw *hx)
{
        if (hx->bch.tx_skb && hx->bch.tx_idx < hx->bch.tx_skb->len) {
                hscx_fill_fifo(hx);
        } else {
                dev_kfree_skb(hx->bch.tx_skb);
                if (get_next_bframe(&hx->bch)) {
                        hscx_fill_fifo(hx);
                        test_and_clear_bit(FLG_TX_EMPTY, &hx->bch.Flags);
                } else if (test_bit(FLG_TX_EMPTY, &hx->bch.Flags)) {
                        hscx_fill_fifo(hx);
                }
        }
}

static void
ipac_rme(struct hscx_hw *hx)
{
        int count;
        u8 rstab;

        if (hx->ip->type & IPAC_TYPE_IPACX)
                rstab = ReadHSCX(hx, IPACX_RSTAB);
        else
                rstab = ReadHSCX(hx, IPAC_RSTAB);
        pr_debug("%s: B%1d RSTAB %02x\n", hx->ip->name, hx->bch.nr, rstab);
        if ((rstab & 0xf0) != 0xa0) {
                /* !(VFR && !RDO && CRC && !RAB) */
                if (!(rstab & 0x80)) {
                        if (hx->bch.debug & DEBUG_HW_BCHANNEL)
                                pr_notice("%s: B%1d invalid frame\n",
                                          hx->ip->name, hx->bch.nr);
                }
                if (rstab & 0x40) {
                        if (hx->bch.debug & DEBUG_HW_BCHANNEL)
                                pr_notice("%s: B%1d RDO proto=%x\n",
                                          hx->ip->name, hx->bch.nr,
                                          hx->bch.state);
                }
                if (!(rstab & 0x20)) {
                        if (hx->bch.debug & DEBUG_HW_BCHANNEL)
                                pr_notice("%s: B%1d CRC error\n",
                                          hx->ip->name, hx->bch.nr);
                }
                hscx_cmdr(hx, 0x80); /* Do RMC */
                return;
        }
        if (hx->ip->type & IPAC_TYPE_IPACX)
                count = ReadHSCX(hx, IPACX_RBCLB);
        else
                count = ReadHSCX(hx, IPAC_RBCLB);
        count &= (hx->fifo_size - 1);
        if (count == 0)
                count = hx->fifo_size;
        hscx_empty_fifo(hx, count);
        if (!hx->bch.rx_skb)
                return;
        if (hx->bch.rx_skb->len < 2) {
                pr_debug("%s: B%1d frame too short %d\n",
                         hx->ip->name, hx->bch.nr, hx->bch.rx_skb->len);
                skb_trim(hx->bch.rx_skb, 0);
        } else {
                skb_trim(hx->bch.rx_skb, hx->bch.rx_skb->len - 1);
                recv_Bchannel(&hx->bch, 0, false);
        }
}

static void
ipac_irq(struct hscx_hw *hx, u8 ista)
{
        u8 istab, m, exirb = 0;

        if (hx->ip->type & IPAC_TYPE_IPACX)
                istab = ReadHSCX(hx, IPACX_ISTAB);
        else if (hx->ip->type & IPAC_TYPE_IPAC) {
                istab = ReadHSCX(hx, IPAC_ISTAB);
                m = (hx->bch.nr & 1) ? IPAC__EXA : IPAC__EXB;
                if (m & ista) {
                        exirb = ReadHSCX(hx, IPAC_EXIRB);
                        pr_debug("%s: B%1d EXIRB %02x\n", hx->ip->name,
                                 hx->bch.nr, exirb);
                }
        } else if (hx->bch.nr & 2) { /* HSCX B */
                if (ista & (HSCX__EXA | HSCX__ICA))
                        ipac_irq(&hx->ip->hscx[0], ista);
                if (ista & HSCX__EXB) {
                        exirb = ReadHSCX(hx, IPAC_EXIRB);
                        pr_debug("%s: B%1d EXIRB %02x\n", hx->ip->name,
                                 hx->bch.nr, exirb);
                }
                istab = ista & 0xF8;
        } else { /* HSCX A */
                istab = ReadHSCX(hx, IPAC_ISTAB);
                if (ista & HSCX__EXA) {
                        exirb = ReadHSCX(hx, IPAC_EXIRB);
                        pr_debug("%s: B%1d EXIRB %02x\n", hx->ip->name,
                                 hx->bch.nr, exirb);
                }
                istab = istab & 0xF8;
        }
        if (exirb & IPAC_B_XDU)
                istab |= IPACX_B_XDU;
        if (exirb & IPAC_B_RFO)
                istab |= IPACX_B_RFO;
        pr_debug("%s: B%1d ISTAB %02x\n", hx->ip->name, hx->bch.nr, istab);

        if (!test_bit(FLG_ACTIVE, &hx->bch.Flags))
                return;

        if (istab & IPACX_B_RME)
                ipac_rme(hx);

        if (istab & IPACX_B_RPF) {
                hscx_empty_fifo(hx, hx->fifo_size);
                if (test_bit(FLG_TRANSPARENT, &hx->bch.Flags))
                        recv_Bchannel(&hx->bch, 0, false);
        }

        if (istab & IPACX_B_RFO) {
                pr_debug("%s: B%1d RFO error\n", hx->ip->name, hx->bch.nr);
                hscx_cmdr(hx, 0x40);    /* RRES */
        }

        if (istab & IPACX_B_XPR)
                hscx_xpr(hx);

        if (istab & IPACX_B_XDU) {
                if (test_bit(FLG_TRANSPARENT, &hx->bch.Flags)) {
                        if (test_bit(FLG_FILLEMPTY, &hx->bch.Flags))
                                test_and_set_bit(FLG_TX_EMPTY, &hx->bch.Flags);
                        hscx_xpr(hx);
                        return;
                }
                pr_debug("%s: B%1d XDU error at len %d\n", hx->ip->name,
                         hx->bch.nr, hx->bch.tx_idx);
                hx->bch.tx_idx = 0;
                hscx_cmdr(hx, 0x01);    /* XRES */
        }
}

irqreturn_t
mISDNipac_irq(struct ipac_hw *ipac, int maxloop)
{
        int cnt = maxloop + 1;
        u8 ista, istad;
        struct isac_hw  *isac = &ipac->isac;

        if (ipac->type & IPAC_TYPE_IPACX) {
                ista = ReadIPAC(ipac, ISACX_ISTA);
                while (ista && --cnt) {
                        pr_debug("%s: ISTA %02x\n", ipac->name, ista);
                        if (ista & IPACX__ICA)
                                ipac_irq(&ipac->hscx[0], ista);
                        if (ista & IPACX__ICB)
                                ipac_irq(&ipac->hscx[1], ista);
                        if (ista & (ISACX__ICD | ISACX__CIC))
                                mISDNisac_irq(&ipac->isac, ista);
                        ista = ReadIPAC(ipac, ISACX_ISTA);
                }
        } else if (ipac->type & IPAC_TYPE_IPAC) {
                ista = ReadIPAC(ipac, IPAC_ISTA);
                while (ista && --cnt) {
                        pr_debug("%s: ISTA %02x\n", ipac->name, ista);
                        if (ista & (IPAC__ICD | IPAC__EXD)) {
                                istad = ReadISAC(isac, ISAC_ISTA);
                                pr_debug("%s: ISTAD %02x\n", ipac->name, istad);
                                if (istad & IPAC_D_TIN2)
                                        pr_debug("%s TIN2 irq\n", ipac->name);
                                if (ista & IPAC__EXD)
                                        istad |= 1; /* ISAC EXI */
                                mISDNisac_irq(isac, istad);
                        }
                        if (ista & (IPAC__ICA | IPAC__EXA))
                                ipac_irq(&ipac->hscx[0], ista);
                        if (ista & (IPAC__ICB | IPAC__EXB))
                                ipac_irq(&ipac->hscx[1], ista);
                        ista = ReadIPAC(ipac, IPAC_ISTA);
                }
        } else if (ipac->type & IPAC_TYPE_HSCX) {
                while (--cnt) {
                        ista = ReadIPAC(ipac, IPAC_ISTAB + ipac->hscx[1].off);
                        pr_debug("%s: B2 ISTA %02x\n", ipac->name, ista);
                        if (ista)
                                ipac_irq(&ipac->hscx[1], ista);
                        istad = ReadISAC(isac, ISAC_ISTA);
                        pr_debug("%s: ISTAD %02x\n", ipac->name, istad);
                        if (istad)
                                mISDNisac_irq(isac, istad);
                        if (0 == (ista | istad))
                                break;
                }
        }
        if (cnt > maxloop) /* only for ISAC/HSCX without PCI IRQ test */
                return IRQ_NONE;
        if (cnt < maxloop)
                pr_debug("%s: %d irqloops cpu%d\n", ipac->name,
                         maxloop - cnt, smp_processor_id());
        if (maxloop && !cnt)
                pr_notice("%s: %d IRQ LOOP cpu%d\n", ipac->name,
                          maxloop, smp_processor_id());
        return IRQ_HANDLED;
}
EXPORT_SYMBOL(mISDNipac_irq);

static int
hscx_mode(struct hscx_hw *hscx, u32 bprotocol)
{
        pr_debug("%s: HSCX %c protocol %x-->%x ch %d\n", hscx->ip->name,
                 '@' + hscx->bch.nr, hscx->bch.state, bprotocol, hscx->bch.nr);
        if (hscx->ip->type & IPAC_TYPE_IPACX) {
                if (hscx->bch.nr & 1) { /* B1 and ICA */
                        WriteIPAC(hscx->ip, ISACX_BCHA_TSDP_BC1, 0x80);
                        WriteIPAC(hscx->ip, ISACX_BCHA_CR, 0x88);
                } else { /* B2 and ICB */
                        WriteIPAC(hscx->ip, ISACX_BCHB_TSDP_BC1, 0x81);
                        WriteIPAC(hscx->ip, ISACX_BCHB_CR, 0x88);
                }
                switch (bprotocol) {
                case ISDN_P_NONE: /* init */
                        WriteHSCX(hscx, IPACX_MODEB, 0xC0);     /* rec off */
                        WriteHSCX(hscx, IPACX_EXMB,  0x30);     /* std adj. */
                        WriteHSCX(hscx, IPACX_MASKB, 0xFF);     /* ints off */
                        hscx_cmdr(hscx, 0x41);
                        test_and_clear_bit(FLG_HDLC, &hscx->bch.Flags);
                        test_and_clear_bit(FLG_TRANSPARENT, &hscx->bch.Flags);
                        break;
                case ISDN_P_B_RAW:
                        WriteHSCX(hscx, IPACX_MODEB, 0x88);     /* ex trans */
                        WriteHSCX(hscx, IPACX_EXMB,  0x00);     /* trans */
                        hscx_cmdr(hscx, 0x41);
                        WriteHSCX(hscx, IPACX_MASKB, IPACX_B_ON);
                        test_and_set_bit(FLG_TRANSPARENT, &hscx->bch.Flags);
                        break;
                case ISDN_P_B_HDLC:
                        WriteHSCX(hscx, IPACX_MODEB, 0xC0);     /* trans */
                        WriteHSCX(hscx, IPACX_EXMB,  0x00);     /* hdlc,crc */
                        hscx_cmdr(hscx, 0x41);
                        WriteHSCX(hscx, IPACX_MASKB, IPACX_B_ON);
                        test_and_set_bit(FLG_HDLC, &hscx->bch.Flags);
                        break;
                default:
                        pr_info("%s: protocol not known %x\n", hscx->ip->name,
                                bprotocol);
                        return -ENOPROTOOPT;
                }
        } else if (hscx->ip->type & IPAC_TYPE_IPAC) { /* IPAC */
                WriteHSCX(hscx, IPAC_CCR1, 0x82);
                WriteHSCX(hscx, IPAC_CCR2, 0x30);
                WriteHSCX(hscx, IPAC_XCCR, 0x07);
                WriteHSCX(hscx, IPAC_RCCR, 0x07);
                WriteHSCX(hscx, IPAC_TSAX, hscx->slot);
                WriteHSCX(hscx, IPAC_TSAR, hscx->slot);
                switch (bprotocol) {
                case ISDN_P_NONE:
                        WriteHSCX(hscx, IPAC_TSAX, 0x1F);
                        WriteHSCX(hscx, IPAC_TSAR, 0x1F);
                        WriteHSCX(hscx, IPAC_MODEB, 0x84);
                        WriteHSCX(hscx, IPAC_CCR1, 0x82);
                        WriteHSCX(hscx, IPAC_MASKB, 0xFF);      /* ints off */
                        test_and_clear_bit(FLG_HDLC, &hscx->bch.Flags);
                        test_and_clear_bit(FLG_TRANSPARENT, &hscx->bch.Flags);
                        break;
                case ISDN_P_B_RAW:
                        WriteHSCX(hscx, IPAC_MODEB, 0xe4);      /* ex trans */
                        WriteHSCX(hscx, IPAC_CCR1, 0x82);
                        hscx_cmdr(hscx, 0x41);
                        WriteHSCX(hscx, IPAC_MASKB, 0);
                        test_and_set_bit(FLG_TRANSPARENT, &hscx->bch.Flags);
                        break;
                case ISDN_P_B_HDLC:
                        WriteHSCX(hscx, IPAC_MODEB, 0x8c);
                        WriteHSCX(hscx, IPAC_CCR1, 0x8a);
                        hscx_cmdr(hscx, 0x41);
                        WriteHSCX(hscx, IPAC_MASKB, 0);
                        test_and_set_bit(FLG_HDLC, &hscx->bch.Flags);
                        break;
                default:
                        pr_info("%s: protocol not known %x\n", hscx->ip->name,
                                bprotocol);
                        return -ENOPROTOOPT;
                }
        } else if (hscx->ip->type & IPAC_TYPE_HSCX) { /* HSCX */
                WriteHSCX(hscx, IPAC_CCR1, 0x85);
                WriteHSCX(hscx, IPAC_CCR2, 0x30);
                WriteHSCX(hscx, IPAC_XCCR, 0x07);
                WriteHSCX(hscx, IPAC_RCCR, 0x07);
                WriteHSCX(hscx, IPAC_TSAX, hscx->slot);
                WriteHSCX(hscx, IPAC_TSAR, hscx->slot);
                switch (bprotocol) {
                case ISDN_P_NONE:
                        WriteHSCX(hscx, IPAC_TSAX, 0x1F);
                        WriteHSCX(hscx, IPAC_TSAR, 0x1F);
                        WriteHSCX(hscx, IPAC_MODEB, 0x84);
                        WriteHSCX(hscx, IPAC_CCR1, 0x85);
                        WriteHSCX(hscx, IPAC_MASKB, 0xFF);      /* ints off */
                        test_and_clear_bit(FLG_HDLC, &hscx->bch.Flags);
                        test_and_clear_bit(FLG_TRANSPARENT, &hscx->bch.Flags);
                        break;
                case ISDN_P_B_RAW:
                        WriteHSCX(hscx, IPAC_MODEB, 0xe4);      /* ex trans */
                        WriteHSCX(hscx, IPAC_CCR1, 0x85);
                        hscx_cmdr(hscx, 0x41);
                        WriteHSCX(hscx, IPAC_MASKB, 0);
                        test_and_set_bit(FLG_TRANSPARENT, &hscx->bch.Flags);
                        break;
                case ISDN_P_B_HDLC:
                        WriteHSCX(hscx, IPAC_MODEB, 0x8c);
                        WriteHSCX(hscx, IPAC_CCR1, 0x8d);
                        hscx_cmdr(hscx, 0x41);
                        WriteHSCX(hscx, IPAC_MASKB, 0);
                        test_and_set_bit(FLG_HDLC, &hscx->bch.Flags);
                        break;
                default:
                        pr_info("%s: protocol not known %x\n", hscx->ip->name,
                                bprotocol);
                        return -ENOPROTOOPT;
                }
        } else
                return -EINVAL;
        hscx->bch.state = bprotocol;
        return 0;
}

static int
hscx_l2l1(struct mISDNchannel *ch, struct sk_buff *skb)
{
        struct bchannel *bch = container_of(ch, struct bchannel, ch);
        struct hscx_hw  *hx = container_of(bch, struct hscx_hw, bch);
        int ret = -EINVAL;
        struct mISDNhead *hh = mISDN_HEAD_P(skb);
        unsigned long flags;

        switch (hh->prim) {
        case PH_DATA_REQ:
                spin_lock_irqsave(hx->ip->hwlock, flags);
                ret = bchannel_senddata(bch, skb);
                if (ret > 0) { /* direct TX */
                        ret = 0;
                        hscx_fill_fifo(hx);
                }
                spin_unlock_irqrestore(hx->ip->hwlock, flags);
                return ret;
        case PH_ACTIVATE_REQ:
                spin_lock_irqsave(hx->ip->hwlock, flags);
                if (!test_and_set_bit(FLG_ACTIVE, &bch->Flags))
                        ret = hscx_mode(hx, ch->protocol);
                else
                        ret = 0;
                spin_unlock_irqrestore(hx->ip->hwlock, flags);
                if (!ret)
                        _queue_data(ch, PH_ACTIVATE_IND, MISDN_ID_ANY, 0,
                                    NULL, GFP_KERNEL);
                break;
        case PH_DEACTIVATE_REQ:
                spin_lock_irqsave(hx->ip->hwlock, flags);
                mISDN_clear_bchannel(bch);
                hscx_mode(hx, ISDN_P_NONE);
                spin_unlock_irqrestore(hx->ip->hwlock, flags);
                _queue_data(ch, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
                            NULL, GFP_KERNEL);
                ret = 0;
                break;
        default:
                pr_info("%s: %s unknown prim(%x,%x)\n",
                        hx->ip->name, __func__, hh->prim, hh->id);
                ret = -EINVAL;
        }
        if (!ret)
                dev_kfree_skb(skb);
        return ret;
}

static int
channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
{
        return mISDN_ctrl_bchannel(bch, cq);
}

static int
hscx_bctrl(struct mISDNchannel *ch, u32 cmd, void *arg)
{
        struct bchannel *bch = container_of(ch, struct bchannel, ch);
        struct hscx_hw  *hx = container_of(bch, struct hscx_hw, bch);
        int ret = -EINVAL;
        u_long flags;

        pr_debug("%s: %s cmd:%x %p\n", hx->ip->name, __func__, cmd, arg);
        switch (cmd) {
        case CLOSE_CHANNEL:
                test_and_clear_bit(FLG_OPEN, &bch->Flags);
                cancel_work_sync(&bch->workq);
                spin_lock_irqsave(hx->ip->hwlock, flags);
                mISDN_clear_bchannel(bch);
                hscx_mode(hx, ISDN_P_NONE);
                spin_unlock_irqrestore(hx->ip->hwlock, flags);
                ch->protocol = ISDN_P_NONE;
                ch->peer = NULL;
                module_put(hx->ip->owner);
                ret = 0;
                break;
        case CONTROL_CHANNEL:
                ret = channel_bctrl(bch, arg);
                break;
        default:
                pr_info("%s: %s unknown prim(%x)\n",
                        hx->ip->name, __func__, cmd);
        }
        return ret;
}

static void
free_ipac(struct ipac_hw *ipac)
{
        isac_release(&ipac->isac);
}

static const char *HSCXVer[] =
{"A1", "?1", "A2", "?3", "A3", "V2.1", "?6", "?7",
 "?8", "?9", "?10", "?11", "?12", "?13", "?14", "???"};



static void
hscx_init(struct hscx_hw *hx)
{
        u8 val;

        WriteHSCX(hx, IPAC_RAH2, 0xFF);
        WriteHSCX(hx, IPAC_XBCH, 0x00);
        WriteHSCX(hx, IPAC_RLCR, 0x00);

        if (hx->ip->type & IPAC_TYPE_HSCX) {
                WriteHSCX(hx, IPAC_CCR1, 0x85);
                val = ReadHSCX(hx, HSCX_VSTR);
                pr_debug("%s: HSCX VSTR %02x\n", hx->ip->name, val);
                if (hx->bch.debug & DEBUG_HW)
                        pr_notice("%s: HSCX version %s\n", hx->ip->name,
                                  HSCXVer[val & 0x0f]);
        } else
                WriteHSCX(hx, IPAC_CCR1, 0x82);
        WriteHSCX(hx, IPAC_CCR2, 0x30);
        WriteHSCX(hx, IPAC_XCCR, 0x07);
        WriteHSCX(hx, IPAC_RCCR, 0x07);
}

static int
ipac_init(struct ipac_hw *ipac)
{
        u8 val;

        if (ipac->type & IPAC_TYPE_HSCX) {
                hscx_init(&ipac->hscx[0]);
                hscx_init(&ipac->hscx[1]);
                val = ReadIPAC(ipac, IPAC_ID);
        } else if (ipac->type & IPAC_TYPE_IPAC) {
                hscx_init(&ipac->hscx[0]);
                hscx_init(&ipac->hscx[1]);
                WriteIPAC(ipac, IPAC_MASK, IPAC__ON);
                val = ReadIPAC(ipac, IPAC_CONF);
                /* conf is default 0, but can be overwritten by card setup */
                pr_debug("%s: IPAC CONF %02x/%02x\n", ipac->name,
                         val, ipac->conf);
                WriteIPAC(ipac, IPAC_CONF, ipac->conf);
                val = ReadIPAC(ipac, IPAC_ID);
                if (ipac->hscx[0].bch.debug & DEBUG_HW)
                        pr_notice("%s: IPAC Design ID %02x\n", ipac->name, val);
        }
        /* nothing special for IPACX to do here */
        return isac_init(&ipac->isac);
}

static int
open_bchannel(struct ipac_hw *ipac, 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 = &ipac->hscx[rq->adr.channel - 1].bch;
        if (test_and_set_bit(FLG_OPEN, &bch->Flags))
                return -EBUSY; /* b-channel can be only open once */
        test_and_clear_bit(FLG_FILLEMPTY, &bch->Flags);
        bch->ch.protocol = rq->protocol;
        rq->ch = &bch->ch;
        return 0;
}

static int
channel_ctrl(struct ipac_hw *ipac, struct mISDN_ctrl_req *cq)
{
        int     ret = 0;

        switch (cq->op) {
        case MISDN_CTRL_GETOP:
                cq->op = MISDN_CTRL_LOOP | MISDN_CTRL_L1_TIMER3;
                break;
        case MISDN_CTRL_LOOP:
                /* cq->channel: 0 disable, 1 B1 loop 2 B2 loop, 3 both */
                if (cq->channel < 0 || cq->channel > 3) {
                        ret = -EINVAL;
                        break;
                }
                ret = ipac->ctrl(ipac, HW_TESTLOOP, cq->channel);
                break;
        case MISDN_CTRL_L1_TIMER3:
                ret = ipac->isac.ctrl(&ipac->isac, HW_TIMER3_VALUE, cq->p1);
                break;
        default:
                pr_info("%s: unknown CTRL OP %x\n", ipac->name, cq->op);
                ret = -EINVAL;
                break;
        }
        return ret;
}

static int
ipac_dctrl(struct mISDNchannel *ch, u32 cmd, void *arg)
{
        struct mISDNdevice *dev = container_of(ch, struct mISDNdevice, D);
        struct dchannel *dch = container_of(dev, struct dchannel, dev);
        struct isac_hw *isac = container_of(dch, struct isac_hw, dch);
        struct ipac_hw *ipac = container_of(isac, struct ipac_hw, isac);
        struct channel_req *rq;
        int err = 0;

        pr_debug("%s: DCTRL: %x %p\n", ipac->name, cmd, arg);
        switch (cmd) {
        case OPEN_CHANNEL:
                rq = arg;
                if (rq->protocol == ISDN_P_TE_S0)
                        err = open_dchannel_caller(isac, rq, __builtin_return_address(0));
                else
                        err = open_bchannel(ipac, rq);
                if (err)
                        break;
                if (!try_module_get(ipac->owner))
                        pr_info("%s: cannot get module\n", ipac->name);
                break;
        case CLOSE_CHANNEL:
                pr_debug("%s: dev(%d) close from %p\n", ipac->name,
                         dch->dev.id, __builtin_return_address(0));
                module_put(ipac->owner);
                break;
        case CONTROL_CHANNEL:
                err = channel_ctrl(ipac, arg);
                break;
        default:
                pr_debug("%s: unknown DCTRL command %x\n", ipac->name, cmd);
                return -EINVAL;
        }
        return err;
}

u32
mISDNipac_init(struct ipac_hw *ipac, void *hw)
{
        u32 ret;
        u8 i;

        ipac->hw = hw;
        if (ipac->isac.dch.debug & DEBUG_HW)
                pr_notice("%s: ipac type %x\n", ipac->name, ipac->type);
        if (ipac->type & IPAC_TYPE_HSCX) {
                ipac->isac.type = IPAC_TYPE_ISAC;
                ipac->hscx[0].off = 0;
                ipac->hscx[1].off = 0x40;
                ipac->hscx[0].fifo_size = 32;
                ipac->hscx[1].fifo_size = 32;
        } else if (ipac->type & IPAC_TYPE_IPAC) {
                ipac->isac.type = IPAC_TYPE_IPAC | IPAC_TYPE_ISAC;
                ipac->hscx[0].off = 0;
                ipac->hscx[1].off = 0x40;
                ipac->hscx[0].fifo_size = 64;
                ipac->hscx[1].fifo_size = 64;
        } else if (ipac->type & IPAC_TYPE_IPACX) {
                ipac->isac.type = IPAC_TYPE_IPACX | IPAC_TYPE_ISACX;
                ipac->hscx[0].off = IPACX_OFF_ICA;
                ipac->hscx[1].off = IPACX_OFF_ICB;
                ipac->hscx[0].fifo_size = 64;
                ipac->hscx[1].fifo_size = 64;
        } else
                return 0;

        mISDNisac_init(&ipac->isac, hw);

        ipac->isac.dch.dev.D.ctrl = ipac_dctrl;

        for (i = 0; i < 2; i++) {
                ipac->hscx[i].bch.nr = i + 1;
                set_channelmap(i + 1, ipac->isac.dch.dev.channelmap);
                list_add(&ipac->hscx[i].bch.ch.list,
                         &ipac->isac.dch.dev.bchannels);
                mISDN_initbchannel(&ipac->hscx[i].bch, MAX_DATA_MEM,
                                   ipac->hscx[i].fifo_size);
                ipac->hscx[i].bch.ch.nr = i + 1;
                ipac->hscx[i].bch.ch.send = &hscx_l2l1;
                ipac->hscx[i].bch.ch.ctrl = hscx_bctrl;
                ipac->hscx[i].bch.hw = hw;
                ipac->hscx[i].ip = ipac;
                /* default values for IOM time slots
                 * can be overwritten by card */
                ipac->hscx[i].slot = (i == 0) ? 0x2f : 0x03;
        }

        ipac->init = ipac_init;
        ipac->release = free_ipac;

        ret =   (1 << (ISDN_P_B_RAW & ISDN_P_B_MASK)) |
                (1 << (ISDN_P_B_HDLC & ISDN_P_B_MASK));
        return ret;
}
EXPORT_SYMBOL(mISDNipac_init);

static int __init
isac_mod_init(void)
{
        pr_notice("mISDNipac module version %s\n", ISAC_REV);
        return 0;
}

static void __exit
isac_mod_cleanup(void)
{
        pr_notice("mISDNipac module unloaded\n");
}
module_init(isac_mod_init);
module_exit(isac_mod_cleanup);