// SPDX-License-Identifier: GPL-2.0-only
/*
 * NETJet mISDN driver
 *
 * Author       Karsten Keil <keil@isdn4linux.de>
 *
 * Copyright 2009  by Karsten Keil <keil@isdn4linux.de>
 */

#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 "ipac.h"
#include "iohelper.h"
#include "netjet.h"
#include "isdnhdlc.h"

#define NETJET_REV      "2.0"

enum nj_types {
        NETJET_S_TJ300,
        NETJET_S_TJ320,
        ENTERNOW__TJ320,
};

struct tiger_dma {
        size_t          size;
        u32             *start;
        int             idx;
        u32             dmastart;
        u32             dmairq;
        u32             dmaend;
        u32             dmacur;
};

struct tiger_hw;

struct tiger_ch {
        struct bchannel         bch;
        struct tiger_hw         *nj;
        int                     idx;
        int                     free;
        int                     lastrx;
        u16                     rxstate;
        u16                     txstate;
        struct isdnhdlc_vars    hsend;
        struct isdnhdlc_vars    hrecv;
        u8                      *hsbuf;
        u8                      *hrbuf;
};

#define TX_INIT         0x0001
#define TX_IDLE         0x0002
#define TX_RUN          0x0004
#define TX_UNDERRUN     0x0100
#define RX_OVERRUN      0x0100

#define LOG_SIZE        64

struct tiger_hw {
        struct list_head        list;
        struct pci_dev          *pdev;
        char                    name[MISDN_MAX_IDLEN];
        enum nj_types           typ;
        int                     irq;
        u32                     irqcnt;
        u32                     base;
        size_t                  base_s;
        dma_addr_t              dma;
        void                    *dma_p;
        spinlock_t              lock;   /* lock HW */
        struct isac_hw          isac;
        struct tiger_dma        send;
        struct tiger_dma        recv;
        struct tiger_ch         bc[2];
        u8                      ctrlreg;
        u8                      dmactrl;
        u8                      auxd;
        u8                      last_is0;
        u8                      irqmask0;
        char                    log[LOG_SIZE];
};

static LIST_HEAD(Cards);
static DEFINE_RWLOCK(card_lock); /* protect Cards */
static u32 debug;
static int nj_cnt;

static void
_set_debug(struct tiger_hw *card)
{
        card->isac.dch.debug = debug;
        card->bc[0].bch.debug = debug;
        card->bc[1].bch.debug = debug;
}

static int
set_debug(const char *val, const struct kernel_param *kp)
{
        int ret;
        struct tiger_hw *card;

        ret = param_set_uint(val, kp);
        if (!ret) {
                read_lock(&card_lock);
                list_for_each_entry(card, &Cards, list)
                        _set_debug(card);
                read_unlock(&card_lock);
        }
        return ret;
}

MODULE_AUTHOR("Karsten Keil");
MODULE_DESCRIPTION("mISDN driver for NETJet cards");
MODULE_LICENSE("GPL v2");
MODULE_VERSION(NETJET_REV);
module_param_call(debug, set_debug, param_get_uint, &debug, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Netjet debug mask");

static void
nj_disable_hwirq(struct tiger_hw *card)
{
        outb(0, card->base + NJ_IRQMASK0);
        outb(0, card->base + NJ_IRQMASK1);
}


static u8
ReadISAC_nj(void *p, u8 offset)
{
        struct tiger_hw *card = p;
        u8 ret;

        card->auxd &= 0xfc;
        card->auxd |= (offset >> 4) & 3;
        outb(card->auxd, card->base + NJ_AUXDATA);
        ret = inb(card->base + NJ_ISAC_OFF + ((offset & 0x0f) << 2));
        return ret;
}

static void
WriteISAC_nj(void *p, u8 offset, u8 value)
{
        struct tiger_hw *card = p;

        card->auxd &= 0xfc;
        card->auxd |= (offset >> 4) & 3;
        outb(card->auxd, card->base + NJ_AUXDATA);
        outb(value, card->base + NJ_ISAC_OFF + ((offset & 0x0f) << 2));
}

static void
ReadFiFoISAC_nj(void *p, u8 offset, u8 *data, int size)
{
        struct tiger_hw *card = p;

        card->auxd &= 0xfc;
        outb(card->auxd, card->base + NJ_AUXDATA);
        insb(card->base + NJ_ISAC_OFF, data, size);
}

static void
WriteFiFoISAC_nj(void *p, u8 offset, u8 *data, int size)
{
        struct tiger_hw *card = p;

        card->auxd &= 0xfc;
        outb(card->auxd, card->base + NJ_AUXDATA);
        outsb(card->base + NJ_ISAC_OFF, data, size);
}

static void
fill_mem(struct tiger_ch *bc, u32 idx, u32 cnt, u32 fill)
{
        struct tiger_hw *card = bc->bch.hw;
        u32 mask = 0xff, val;

        pr_debug("%s: B%1d fill %02x len %d idx %d/%d\n", card->name,
                 bc->bch.nr, fill, cnt, idx, card->send.idx);
        if (bc->bch.nr & 2) {
                fill  <<= 8;
                mask <<= 8;
        }
        mask ^= 0xffffffff;
        while (cnt--) {
                val = card->send.start[idx];
                val &= mask;
                val |= fill;
                card->send.start[idx++] = val;
                if (idx >= card->send.size)
                        idx = 0;
        }
}

static int
mode_tiger(struct tiger_ch *bc, u32 protocol)
{
        struct tiger_hw *card = bc->bch.hw;

        pr_debug("%s: B%1d protocol %x-->%x\n", card->name,
                 bc->bch.nr, bc->bch.state, protocol);
        switch (protocol) {
        case ISDN_P_NONE:
                if (bc->bch.state == ISDN_P_NONE)
                        break;
                fill_mem(bc, 0, card->send.size, 0xff);
                bc->bch.state = protocol;
                /* only stop dma and interrupts if both channels NULL */
                if ((card->bc[0].bch.state == ISDN_P_NONE) &&
                    (card->bc[1].bch.state == ISDN_P_NONE)) {
                        card->dmactrl = 0;
                        outb(card->dmactrl, card->base + NJ_DMACTRL);
                        outb(0, card->base + NJ_IRQMASK0);
                }
                test_and_clear_bit(FLG_HDLC, &bc->bch.Flags);
                test_and_clear_bit(FLG_TRANSPARENT, &bc->bch.Flags);
                bc->txstate = 0;
                bc->rxstate = 0;
                bc->lastrx = -1;
                break;
        case ISDN_P_B_RAW:
                test_and_set_bit(FLG_TRANSPARENT, &bc->bch.Flags);
                bc->bch.state = protocol;
                bc->idx = 0;
                bc->free = card->send.size / 2;
                bc->rxstate = 0;
                bc->txstate = TX_INIT | TX_IDLE;
                bc->lastrx = -1;
                if (!card->dmactrl) {
                        card->dmactrl = 1;
                        outb(card->dmactrl, card->base + NJ_DMACTRL);
                        outb(0x0f, card->base + NJ_IRQMASK0);
                }
                break;
        case ISDN_P_B_HDLC:
                test_and_set_bit(FLG_HDLC, &bc->bch.Flags);
                bc->bch.state = protocol;
                bc->idx = 0;
                bc->free = card->send.size / 2;
                bc->rxstate = 0;
                bc->txstate = TX_INIT | TX_IDLE;
                isdnhdlc_rcv_init(&bc->hrecv, 0);
                isdnhdlc_out_init(&bc->hsend, 0);
                bc->lastrx = -1;
                if (!card->dmactrl) {
                        card->dmactrl = 1;
                        outb(card->dmactrl, card->base + NJ_DMACTRL);
                        outb(0x0f, card->base + NJ_IRQMASK0);
                }
                break;
        default:
                pr_info("%s: %s protocol %x not handled\n", card->name,
                        __func__, protocol);
                return -ENOPROTOOPT;
        }
        card->send.dmacur = inl(card->base + NJ_DMA_READ_ADR);
        card->recv.dmacur = inl(card->base + NJ_DMA_WRITE_ADR);
        card->send.idx = (card->send.dmacur - card->send.dmastart) >> 2;
        card->recv.idx = (card->recv.dmacur - card->recv.dmastart) >> 2;
        pr_debug("%s: %s ctrl %x irq  %02x/%02x idx %d/%d\n",
                 card->name, __func__,
                 inb(card->base + NJ_DMACTRL),
                 inb(card->base + NJ_IRQMASK0),
                 inb(card->base + NJ_IRQSTAT0),
                 card->send.idx,
                 card->recv.idx);
        return 0;
}

static void
nj_reset(struct tiger_hw *card)
{
        outb(0xff, card->base + NJ_CTRL); /* Reset On */
        mdelay(1);

        /* now edge triggered for TJ320 GE 13/07/00 */
        /* see comment in IRQ function */
        if (card->typ == NETJET_S_TJ320) /* TJ320 */
                card->ctrlreg = 0x40;  /* Reset Off and status read clear */
        else
                card->ctrlreg = 0x00;  /* Reset Off and status read clear */
        outb(card->ctrlreg, card->base + NJ_CTRL);
        mdelay(10);

        /* configure AUX pins (all output except ISAC IRQ pin) */
        card->auxd = 0;
        card->dmactrl = 0;
        outb(~NJ_ISACIRQ, card->base + NJ_AUXCTRL);
        outb(NJ_ISACIRQ,  card->base + NJ_IRQMASK1);
        outb(card->auxd, card->base + NJ_AUXDATA);
}

static int
inittiger(struct tiger_hw *card)
{
        int i;

        card->dma_p = dma_alloc_coherent(&card->pdev->dev, NJ_DMA_SIZE,
                                         &card->dma, GFP_ATOMIC);
        if (!card->dma_p) {
                pr_info("%s: No DMA memory\n", card->name);
                return -ENOMEM;
        }
        if ((u64)card->dma > 0xffffffff) {
                pr_info("%s: DMA outside 32 bit\n", card->name);
                return -ENOMEM;
        }
        for (i = 0; i < 2; i++) {
                card->bc[i].hsbuf = kmalloc(NJ_DMA_TXSIZE, GFP_ATOMIC);
                if (!card->bc[i].hsbuf) {
                        pr_info("%s: no B%d send buffer\n", card->name, i + 1);
                        return -ENOMEM;
                }
                card->bc[i].hrbuf = kmalloc(NJ_DMA_RXSIZE, GFP_ATOMIC);
                if (!card->bc[i].hrbuf) {
                        pr_info("%s: no B%d recv buffer\n", card->name, i + 1);
                        return -ENOMEM;
                }
        }
        memset(card->dma_p, 0xff, NJ_DMA_SIZE);

        card->send.start = card->dma_p;
        card->send.dmastart = (u32)card->dma;
        card->send.dmaend = card->send.dmastart +
                (4 * (NJ_DMA_TXSIZE - 1));
        card->send.dmairq = card->send.dmastart +
                (4 * ((NJ_DMA_TXSIZE / 2) - 1));
        card->send.size = NJ_DMA_TXSIZE;

        if (debug & DEBUG_HW)
                pr_notice("%s: send buffer phy %#x - %#x - %#x  virt %p"
                          " size %zu u32\n", card->name,
                          card->send.dmastart, card->send.dmairq,
                          card->send.dmaend, card->send.start, card->send.size);

        outl(card->send.dmastart, card->base + NJ_DMA_READ_START);
        outl(card->send.dmairq, card->base + NJ_DMA_READ_IRQ);
        outl(card->send.dmaend, card->base + NJ_DMA_READ_END);

        card->recv.start = card->dma_p + (NJ_DMA_SIZE / 2);
        card->recv.dmastart = (u32)card->dma  + (NJ_DMA_SIZE / 2);
        card->recv.dmaend = card->recv.dmastart +
                (4 * (NJ_DMA_RXSIZE - 1));
        card->recv.dmairq = card->recv.dmastart +
                (4 * ((NJ_DMA_RXSIZE / 2) - 1));
        card->recv.size = NJ_DMA_RXSIZE;

        if (debug & DEBUG_HW)
                pr_notice("%s: recv buffer phy %#x - %#x - %#x  virt %p"
                          " size %zu u32\n", card->name,
                          card->recv.dmastart, card->recv.dmairq,
                          card->recv.dmaend, card->recv.start, card->recv.size);

        outl(card->recv.dmastart, card->base + NJ_DMA_WRITE_START);
        outl(card->recv.dmairq, card->base + NJ_DMA_WRITE_IRQ);
        outl(card->recv.dmaend, card->base + NJ_DMA_WRITE_END);
        return 0;
}

static void
read_dma(struct tiger_ch *bc, u32 idx, int cnt)
{
        struct tiger_hw *card = bc->bch.hw;
        int i, stat;
        u32 val;
        u8 *p, *pn;

        if (bc->lastrx == idx) {
                bc->rxstate |= RX_OVERRUN;
                pr_info("%s: B%1d overrun at idx %d\n", card->name,
                        bc->bch.nr, idx);
        }
        bc->lastrx = idx;
        if (test_bit(FLG_RX_OFF, &bc->bch.Flags)) {
                bc->bch.dropcnt += cnt;
                return;
        }
        stat = bchannel_get_rxbuf(&bc->bch, cnt);
        /* only transparent use the count here, HDLC overun is detected later */
        if (stat == -ENOMEM) {
                pr_warn("%s.B%d: No memory for %d bytes\n",
                        card->name, bc->bch.nr, cnt);
                return;
        }
        if (test_bit(FLG_TRANSPARENT, &bc->bch.Flags))
                p = skb_put(bc->bch.rx_skb, cnt);
        else
                p = bc->hrbuf;

        for (i = 0; i < cnt; i++) {
                val = card->recv.start[idx++];
                if (bc->bch.nr & 2)
                        val >>= 8;
                if (idx >= card->recv.size)
                        idx = 0;
                p[i] = val & 0xff;
        }

        if (test_bit(FLG_TRANSPARENT, &bc->bch.Flags)) {
                recv_Bchannel(&bc->bch, 0, false);
                return;
        }

        pn = bc->hrbuf;
        while (cnt > 0) {
                stat = isdnhdlc_decode(&bc->hrecv, pn, cnt, &i,
                                       bc->bch.rx_skb->data, bc->bch.maxlen);
                if (stat > 0) { /* valid frame received */
                        p = skb_put(bc->bch.rx_skb, stat);
                        if (debug & DEBUG_HW_BFIFO) {
                                snprintf(card->log, LOG_SIZE,
                                         "B%1d-recv %s %d ", bc->bch.nr,
                                         card->name, stat);
                                print_hex_dump_bytes(card->log,
                                                     DUMP_PREFIX_OFFSET, p,
                                                     stat);
                        }
                        recv_Bchannel(&bc->bch, 0, false);
                        stat = bchannel_get_rxbuf(&bc->bch, bc->bch.maxlen);
                        if (stat < 0) {
                                pr_warn("%s.B%d: No memory for %d bytes\n",
                                        card->name, bc->bch.nr, cnt);
                                return;
                        }
                } else if (stat == -HDLC_CRC_ERROR) {
                        pr_info("%s: B%1d receive frame CRC error\n",
                                card->name, bc->bch.nr);
                } else if (stat == -HDLC_FRAMING_ERROR) {
                        pr_info("%s: B%1d receive framing error\n",
                                card->name, bc->bch.nr);
                } else if (stat == -HDLC_LENGTH_ERROR) {
                        pr_info("%s: B%1d receive frame too long (> %d)\n",
                                card->name, bc->bch.nr, bc->bch.maxlen);
                }
                pn += i;
                cnt -= i;
        }
}

static void
recv_tiger(struct tiger_hw *card, u8 irq_stat)
{
        u32 idx;
        int cnt = card->recv.size / 2;

        /* Note receive is via the WRITE DMA channel */
        card->last_is0 &= ~NJ_IRQM0_WR_MASK;
        card->last_is0 |= (irq_stat & NJ_IRQM0_WR_MASK);

        if (irq_stat & NJ_IRQM0_WR_END)
                idx = cnt - 1;
        else
                idx = card->recv.size - 1;

        if (test_bit(FLG_ACTIVE, &card->bc[0].bch.Flags))
                read_dma(&card->bc[0], idx, cnt);
        if (test_bit(FLG_ACTIVE, &card->bc[1].bch.Flags))
                read_dma(&card->bc[1], idx, cnt);
}

/* sync with current DMA address at start or after exception */
static void
resync(struct tiger_ch *bc, struct tiger_hw *card)
{
        card->send.dmacur = inl(card->base | NJ_DMA_READ_ADR);
        card->send.idx = (card->send.dmacur - card->send.dmastart) >> 2;
        if (bc->free > card->send.size / 2)
                bc->free = card->send.size / 2;
        /* currently we simple sync to the next complete free area
         * this hast the advantage that we have always maximum time to
         * handle TX irq
         */
        if (card->send.idx < ((card->send.size / 2) - 1))
                bc->idx = (card->recv.size / 2) - 1;
        else
                bc->idx = card->recv.size - 1;
        bc->txstate = TX_RUN;
        pr_debug("%s: %s B%1d free %d idx %d/%d\n", card->name,
                 __func__, bc->bch.nr, bc->free, bc->idx, card->send.idx);
}

static int bc_next_frame(struct tiger_ch *);

static void
fill_hdlc_flag(struct tiger_ch *bc)
{
        struct tiger_hw *card = bc->bch.hw;
        int count, i;
        u32 m, v;
        u8  *p;

        if (bc->free == 0)
                return;
        pr_debug("%s: %s B%1d %d state %x idx %d/%d\n", card->name,
                 __func__, bc->bch.nr, bc->free, bc->txstate,
                 bc->idx, card->send.idx);
        if (bc->txstate & (TX_IDLE | TX_INIT | TX_UNDERRUN))
                resync(bc, card);
        count = isdnhdlc_encode(&bc->hsend, NULL, 0, &i,
                                bc->hsbuf, bc->free);
        pr_debug("%s: B%1d hdlc encoded %d flags\n", card->name,
                 bc->bch.nr, count);
        bc->free -= count;
        p = bc->hsbuf;
        m = (bc->bch.nr & 1) ? 0xffffff00 : 0xffff00ff;
        for (i = 0; i < count; i++) {
                if (bc->idx >= card->send.size)
                        bc->idx = 0;
                v = card->send.start[bc->idx];
                v &= m;
                v |= (bc->bch.nr & 1) ? (u32)(p[i]) : ((u32)(p[i])) << 8;
                card->send.start[bc->idx++] = v;
        }
        if (debug & DEBUG_HW_BFIFO) {
                snprintf(card->log, LOG_SIZE, "B%1d-send %s %d ",
                         bc->bch.nr, card->name, count);
                print_hex_dump_bytes(card->log, DUMP_PREFIX_OFFSET, p, count);
        }
}

static void
fill_dma(struct tiger_ch *bc)
{
        struct tiger_hw *card = bc->bch.hw;
        int count, i, fillempty = 0;
        u32 m, v, n = 0;
        u8  *p;

        if (bc->free == 0)
                return;
        if (!bc->bch.tx_skb) {
                if (!test_bit(FLG_TX_EMPTY, &bc->bch.Flags))
                        return;
                fillempty = 1;
                count = card->send.size >> 1;
                p = bc->bch.fill;
        } else {
                count = bc->bch.tx_skb->len - bc->bch.tx_idx;
                if (count <= 0)
                        return;
                pr_debug("%s: %s B%1d %d/%d/%d/%d state %x idx %d/%d\n",
                         card->name, __func__, bc->bch.nr, count, bc->free,
                         bc->bch.tx_idx, bc->bch.tx_skb->len, bc->txstate,
                         bc->idx, card->send.idx);
                p = bc->bch.tx_skb->data + bc->bch.tx_idx;
        }
        if (bc->txstate & (TX_IDLE | TX_INIT | TX_UNDERRUN))
                resync(bc, card);
        if (test_bit(FLG_HDLC, &bc->bch.Flags) && !fillempty) {
                count = isdnhdlc_encode(&bc->hsend, p, count, &i,
                                        bc->hsbuf, bc->free);
                pr_debug("%s: B%1d hdlc encoded %d in %d\n", card->name,
                         bc->bch.nr, i, count);
                bc->bch.tx_idx += i;
                bc->free -= count;
                p = bc->hsbuf;
        } else {
                if (count > bc->free)
                        count = bc->free;
                if (!fillempty)
                        bc->bch.tx_idx += count;
                bc->free -= count;
        }
        m = (bc->bch.nr & 1) ? 0xffffff00 : 0xffff00ff;
        if (fillempty) {
                n = p[0];
                if (!(bc->bch.nr & 1))
                        n <<= 8;
                for (i = 0; i < count; i++) {
                        if (bc->idx >= card->send.size)
                                bc->idx = 0;
                        v = card->send.start[bc->idx];
                        v &= m;
                        v |= n;
                        card->send.start[bc->idx++] = v;
                }
        } else {
                for (i = 0; i < count; i++) {
                        if (bc->idx >= card->send.size)
                                bc->idx = 0;
                        v = card->send.start[bc->idx];
                        v &= m;
                        n = p[i];
                        v |= (bc->bch.nr & 1) ? n : n << 8;
                        card->send.start[bc->idx++] = v;
                }
        }
        if (debug & DEBUG_HW_BFIFO) {
                snprintf(card->log, LOG_SIZE, "B%1d-send %s %d ",
                         bc->bch.nr, card->name, count);
                print_hex_dump_bytes(card->log, DUMP_PREFIX_OFFSET, p, count);
        }
        if (bc->free)
                bc_next_frame(bc);
}


static int
bc_next_frame(struct tiger_ch *bc)
{
        int ret = 1;

        if (bc->bch.tx_skb && bc->bch.tx_idx < bc->bch.tx_skb->len) {
                fill_dma(bc);
        } else {
                dev_kfree_skb(bc->bch.tx_skb);
                if (get_next_bframe(&bc->bch)) {
                        fill_dma(bc);
                        test_and_clear_bit(FLG_TX_EMPTY, &bc->bch.Flags);
                } else if (test_bit(FLG_TX_EMPTY, &bc->bch.Flags)) {
                        fill_dma(bc);
                } else if (test_bit(FLG_FILLEMPTY, &bc->bch.Flags)) {
                        test_and_set_bit(FLG_TX_EMPTY, &bc->bch.Flags);
                        ret = 0;
                } else {
                        ret = 0;
                }
        }
        return ret;
}

static void
send_tiger_bc(struct tiger_hw *card, struct tiger_ch *bc)
{
        int ret;

        bc->free += card->send.size / 2;
        if (bc->free >= card->send.size) {
                if (!(bc->txstate & (TX_UNDERRUN | TX_INIT))) {
                        pr_info("%s: B%1d TX underrun state %x\n", card->name,
                                bc->bch.nr, bc->txstate);
                        bc->txstate |= TX_UNDERRUN;
                }
                bc->free = card->send.size;
        }
        ret = bc_next_frame(bc);
        if (!ret) {
                if (test_bit(FLG_HDLC, &bc->bch.Flags)) {
                        fill_hdlc_flag(bc);
                        return;
                }
                pr_debug("%s: B%1d TX no data free %d idx %d/%d\n", card->name,
                         bc->bch.nr, bc->free, bc->idx, card->send.idx);
                if (!(bc->txstate & (TX_IDLE | TX_INIT))) {
                        fill_mem(bc, bc->idx, bc->free, 0xff);
                        if (bc->free == card->send.size)
                                bc->txstate |= TX_IDLE;
                }
        }
}

static void
send_tiger(struct tiger_hw *card, u8 irq_stat)
{
        int i;

        /* Note send is via the READ DMA channel */
        if ((irq_stat & card->last_is0) & NJ_IRQM0_RD_MASK) {
                pr_info("%s: tiger warn write double dma %x/%x\n",
                        card->name, irq_stat, card->last_is0);
                return;
        } else {
                card->last_is0 &= ~NJ_IRQM0_RD_MASK;
                card->last_is0 |= (irq_stat & NJ_IRQM0_RD_MASK);
        }
        for (i = 0; i < 2; i++) {
                if (test_bit(FLG_ACTIVE, &card->bc[i].bch.Flags))
                        send_tiger_bc(card, &card->bc[i]);
        }
}

static irqreturn_t
nj_irq(int intno, void *dev_id)
{
        struct tiger_hw *card = dev_id;
        u8 val, s1val, s0val;

        spin_lock(&card->lock);
        s0val = inb(card->base | NJ_IRQSTAT0);
        s1val = inb(card->base | NJ_IRQSTAT1);
        if ((s1val & NJ_ISACIRQ) && (s0val == 0)) {
                /* shared IRQ */
                spin_unlock(&card->lock);
                return IRQ_NONE;
        }
        pr_debug("%s: IRQSTAT0 %02x IRQSTAT1 %02x\n", card->name, s0val, s1val);
        card->irqcnt++;
        if (!(s1val & NJ_ISACIRQ)) {
                val = ReadISAC_nj(card, ISAC_ISTA);
                if (val)
                        mISDNisac_irq(&card->isac, val);
        }

        if (s0val)
                /* write to clear */
                outb(s0val, card->base | NJ_IRQSTAT0);
        else
                goto end;
        s1val = s0val;
        /* set bits in sval to indicate which page is free */
        card->recv.dmacur = inl(card->base | NJ_DMA_WRITE_ADR);
        card->recv.idx = (card->recv.dmacur - card->recv.dmastart) >> 2;
        if (card->recv.dmacur < card->recv.dmairq)
                s0val = 0x08;   /* the 2nd write area is free */
        else
                s0val = 0x04;   /* the 1st write area is free */

        card->send.dmacur = inl(card->base | NJ_DMA_READ_ADR);
        card->send.idx = (card->send.dmacur - card->send.dmastart) >> 2;
        if (card->send.dmacur < card->send.dmairq)
                s0val |= 0x02;  /* the 2nd read area is free */
        else
                s0val |= 0x01;  /* the 1st read area is free */

        pr_debug("%s: DMA Status %02x/%02x/%02x %d/%d\n", card->name,
                 s1val, s0val, card->last_is0,
                 card->recv.idx, card->send.idx);
        /* test if we have a DMA interrupt */
        if (s0val != card->last_is0) {
                if ((s0val & NJ_IRQM0_RD_MASK) !=
                    (card->last_is0 & NJ_IRQM0_RD_MASK))
                        /* got a write dma int */
                        send_tiger(card, s0val);
                if ((s0val & NJ_IRQM0_WR_MASK) !=
                    (card->last_is0 & NJ_IRQM0_WR_MASK))
                        /* got a read dma int */
                        recv_tiger(card, s0val);
        }
end:
        spin_unlock(&card->lock);
        return IRQ_HANDLED;
}

static int
nj_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb)
{
        int ret = -EINVAL;
        struct bchannel *bch = container_of(ch, struct bchannel, ch);
        struct tiger_ch *bc = container_of(bch, struct tiger_ch, bch);
        struct tiger_hw *card = bch->hw;
        struct mISDNhead *hh = mISDN_HEAD_P(skb);
        unsigned long flags;

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

static int
channel_bctrl(struct tiger_ch *bc, struct mISDN_ctrl_req *cq)
{
        return mISDN_ctrl_bchannel(&bc->bch, cq);
}

static int
nj_bctrl(struct mISDNchannel *ch, u32 cmd, void *arg)
{
        struct bchannel *bch = container_of(ch, struct bchannel, ch);
        struct tiger_ch *bc = container_of(bch, struct tiger_ch, bch);
        struct tiger_hw *card  = bch->hw;
        int ret = -EINVAL;
        u_long flags;

        pr_debug("%s: %s cmd:%x %p\n", card->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(&card->lock, flags);
                mISDN_clear_bchannel(bch);
                mode_tiger(bc, ISDN_P_NONE);
                spin_unlock_irqrestore(&card->lock, flags);
                ch->protocol = ISDN_P_NONE;
                ch->peer = NULL;
                module_put(THIS_MODULE);
                ret = 0;
                break;
        case CONTROL_CHANNEL:
                ret = channel_bctrl(bc, arg);
                break;
        default:
                pr_info("%s: %s unknown prim(%x)\n", card->name, __func__, cmd);
        }
        return ret;
}

static int
channel_ctrl(struct tiger_hw *card, 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 = card->isac.ctrl(&card->isac, HW_TESTLOOP, cq->channel);
                break;
        case MISDN_CTRL_L1_TIMER3:
                ret = card->isac.ctrl(&card->isac, HW_TIMER3_VALUE, cq->p1);
                break;
        default:
                pr_info("%s: %s unknown Op %x\n", card->name, __func__, cq->op);
                ret = -EINVAL;
                break;
        }
        return ret;
}

static int
open_bchannel(struct tiger_hw *card, 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 = &card->bc[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;
}

/*
 * device control function
 */
static int
nj_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 tiger_hw *card = dch->hw;
        struct channel_req      *rq;
        int                     err = 0;

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

static int
nj_init_card(struct tiger_hw *card)
{
        u_long flags;
        int ret;

        spin_lock_irqsave(&card->lock, flags);
        nj_disable_hwirq(card);
        spin_unlock_irqrestore(&card->lock, flags);

        card->irq = card->pdev->irq;
        if (request_irq(card->irq, nj_irq, IRQF_SHARED, card->name, card)) {
                pr_info("%s: couldn't get interrupt %d\n",
                        card->name, card->irq);
                card->irq = -1;
                return -EIO;
        }

        spin_lock_irqsave(&card->lock, flags);
        nj_reset(card);
        ret = card->isac.init(&card->isac);
        if (ret)
                goto error;
        ret = inittiger(card);
        if (ret)
                goto error;
        mode_tiger(&card->bc[0], ISDN_P_NONE);
        mode_tiger(&card->bc[1], ISDN_P_NONE);
error:
        spin_unlock_irqrestore(&card->lock, flags);
        return ret;
}


static void
nj_release(struct tiger_hw *card)
{
        u_long flags;
        int i;

        if (card->base_s) {
                spin_lock_irqsave(&card->lock, flags);
                nj_disable_hwirq(card);
                mode_tiger(&card->bc[0], ISDN_P_NONE);
                mode_tiger(&card->bc[1], ISDN_P_NONE);
                spin_unlock_irqrestore(&card->lock, flags);
                card->isac.release(&card->isac);
                release_region(card->base, card->base_s);
                card->base_s = 0;
        }
        if (card->irq > 0)
                free_irq(card->irq, card);
        if (device_is_registered(&card->isac.dch.dev.dev))
                mISDN_unregister_device(&card->isac.dch.dev);

        for (i = 0; i < 2; i++) {
                mISDN_freebchannel(&card->bc[i].bch);
                kfree(card->bc[i].hsbuf);
                kfree(card->bc[i].hrbuf);
        }
        if (card->dma_p)
                dma_free_coherent(&card->pdev->dev, NJ_DMA_SIZE, card->dma_p,
                                  card->dma);
        write_lock_irqsave(&card_lock, flags);
        list_del(&card->list);
        write_unlock_irqrestore(&card_lock, flags);
        pci_disable_device(card->pdev);
        pci_set_drvdata(card->pdev, NULL);
        kfree(card);
}


static int
nj_setup(struct tiger_hw *card)
{
        card->base = pci_resource_start(card->pdev, 0);
        card->base_s = pci_resource_len(card->pdev, 0);
        if (!request_region(card->base, card->base_s, card->name)) {
                pr_info("%s: NETjet config port %#x-%#x already in use\n",
                        card->name, card->base,
                        (u32)(card->base + card->base_s - 1));
                card->base_s = 0;
                return -EIO;
        }
        ASSIGN_FUNC(nj, ISAC, card->isac);
        return 0;
}


static int
setup_instance(struct tiger_hw *card)
{
        int i, err;
        u_long flags;

        snprintf(card->name, MISDN_MAX_IDLEN - 1, "netjet.%d", nj_cnt + 1);
        write_lock_irqsave(&card_lock, flags);
        list_add_tail(&card->list, &Cards);
        write_unlock_irqrestore(&card_lock, flags);

        _set_debug(card);
        card->isac.name = card->name;
        spin_lock_init(&card->lock);
        card->isac.hwlock = &card->lock;
        mISDNisac_init(&card->isac, card);

        card->isac.dch.dev.Bprotocols = (1 << (ISDN_P_B_RAW & ISDN_P_B_MASK)) |
                (1 << (ISDN_P_B_HDLC & ISDN_P_B_MASK));
        card->isac.dch.dev.D.ctrl = nj_dctrl;
        for (i = 0; i < 2; i++) {
                card->bc[i].bch.nr = i + 1;
                set_channelmap(i + 1, card->isac.dch.dev.channelmap);
                mISDN_initbchannel(&card->bc[i].bch, MAX_DATA_MEM,
                                   NJ_DMA_RXSIZE >> 1);
                card->bc[i].bch.hw = card;
                card->bc[i].bch.ch.send = nj_l2l1B;
                card->bc[i].bch.ch.ctrl = nj_bctrl;
                card->bc[i].bch.ch.nr = i + 1;
                list_add(&card->bc[i].bch.ch.list,
                         &card->isac.dch.dev.bchannels);
                card->bc[i].bch.hw = card;
        }
        err = nj_setup(card);
        if (err)
                goto error;
        err = mISDN_register_device(&card->isac.dch.dev, &card->pdev->dev,
                                    card->name);
        if (err)
                goto error;
        err = nj_init_card(card);
        if (!err)  {
                nj_cnt++;
                pr_notice("Netjet %d cards installed\n", nj_cnt);
                return 0;
        }
error:
        nj_release(card);
        return err;
}

static int
nj_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        int err = -ENOMEM;
        int cfg;
        struct tiger_hw *card;

        if (pdev->subsystem_vendor == 0x8086 &&
            pdev->subsystem_device == 0x0003) {
                pr_notice("Netjet: Digium X100P/X101P not handled\n");
                return -ENODEV;
        }

        if (pdev->subsystem_vendor == 0x55 &&
            pdev->subsystem_device == 0x02) {
                pr_notice("Netjet: Enter!Now not handled yet\n");
                return -ENODEV;
        }

        if (pdev->subsystem_vendor == 0xb100 &&
            pdev->subsystem_device == 0x0003) {
                pr_notice("Netjet: Digium TDM400P not handled yet\n");
                return -ENODEV;
        }

        card = kzalloc_obj(struct tiger_hw);
        if (!card) {
                pr_info("No kmem for Netjet\n");
                return err;
        }

        card->pdev = pdev;

        err = pci_enable_device(pdev);
        if (err) {
                kfree(card);
                return err;
        }

        printk(KERN_INFO "nj_probe(mISDN): found adapter at %s\n",
               pci_name(pdev));

        pci_set_master(pdev);

        /* the TJ300 and TJ320 must be detected, the IRQ handling is different
         * unfortunately the chips use the same device ID, but the TJ320 has
         * the bit20 in status PCI cfg register set
         */
        pci_read_config_dword(pdev, 0x04, &cfg);
        if (cfg & 0x00100000)
                card->typ = NETJET_S_TJ320;
        else
                card->typ = NETJET_S_TJ300;

        card->base = pci_resource_start(pdev, 0);
        pci_set_drvdata(pdev, card);
        err = setup_instance(card);
        if (err)
                pci_set_drvdata(pdev, NULL);

        return err;
}


static void nj_remove(struct pci_dev *pdev)
{
        struct tiger_hw *card = pci_get_drvdata(pdev);

        if (card)
                nj_release(card);
        else
                pr_info("%s drvdata already removed\n", __func__);
}

/* We cannot select cards with PCI_SUB... IDs, since here are cards with
 * SUB IDs set to PCI_ANY_ID, so we need to match all and reject
 * known other cards which not work with this driver - see probe function */
static const struct pci_device_id nj_pci_ids[] = {
        { PCI_VENDOR_ID_TIGERJET, PCI_DEVICE_ID_TIGERJET_300,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        { }
};
MODULE_DEVICE_TABLE(pci, nj_pci_ids);

static struct pci_driver nj_driver = {
        .name = "netjet",
        .probe = nj_probe,
        .remove = nj_remove,
        .id_table = nj_pci_ids,
};

static int __init nj_init(void)
{
        int err;

        pr_notice("Netjet PCI driver Rev. %s\n", NETJET_REV);
        err = pci_register_driver(&nj_driver);
        return err;
}

static void __exit nj_cleanup(void)
{
        pci_unregister_driver(&nj_driver);
}

module_init(nj_init);
module_exit(nj_cleanup);