nj_u.c

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/* $Id: nj_u.c,v 2.14.2.3 2004/01/13 14:31:26 keil Exp $
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 */

#include <linux/init.h>
#include "hisax.h"
#include "icc.h"
#include "isdnl1.h"
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/ppp_defs.h>
#include "netjet.h"

static const char *NETjet_U_revision = "$Revision: 2.14.2.3 $";

static u_char dummyrr(struct IsdnCardState *cs, int chan, u_char off)
{
    return (5);
}

static void dummywr(struct IsdnCardState *cs, int chan, u_char off, u_char value)
{
}

static irqreturn_t
netjet_u_interrupt(int intno, void *dev_id)
{
    struct IsdnCardState *cs = dev_id;
    u_char val, sval;
    u_long flags;

    spin_lock_irqsave(&cs->lock, flags);
    if (!((sval = bytein(cs->hw.njet.base + NETJET_IRQSTAT1)) &
          NETJET_ISACIRQ)) {
        val = NETjet_ReadIC(cs, ICC_ISTA);
        if (cs->debug & L1_DEB_ISAC)
            debugl1(cs, "tiger: i1 %x %x", sval, val);
        if (val) {
            icc_interrupt(cs, val);
            NETjet_WriteIC(cs, ICC_MASK, 0xFF);
            NETjet_WriteIC(cs, ICC_MASK, 0x0);
        }
    }
    /* start new code 13/07/00 GE */
    /* set bits in sval to indicate which page is free */
    if (inl(cs->hw.njet.base + NETJET_DMA_WRITE_ADR) <
        inl(cs->hw.njet.base + NETJET_DMA_WRITE_IRQ))
        /* the 2nd write page is free */
        sval = 0x08;
    else    /* the 1st write page is free */
        sval = 0x04;
    if (inl(cs->hw.njet.base + NETJET_DMA_READ_ADR) <
        inl(cs->hw.njet.base + NETJET_DMA_READ_IRQ))
        /* the 2nd read page is free */
        sval = sval | 0x02;
    else    /* the 1st read page is free */
        sval = sval | 0x01;
    if (sval != cs->hw.njet.last_is0) /* we have a DMA interrupt */
    {
        if (test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
            spin_unlock_irqrestore(&cs->lock, flags);
            return IRQ_HANDLED;
        }
        cs->hw.njet.irqstat0 = sval;
        if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_READ) !=
            (cs->hw.njet.last_is0 & NETJET_IRQM0_READ))
            /* we have a read dma int */
            read_tiger(cs);
        if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_WRITE) !=
            (cs->hw.njet.last_is0 & NETJET_IRQM0_WRITE))
            /* we have a write dma int */
            write_tiger(cs);
        /* end new code 13/07/00 GE */
        test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
    }
    spin_unlock_irqrestore(&cs->lock, flags);
    return IRQ_HANDLED;
}

static void
reset_netjet_u(struct IsdnCardState *cs)
{
    cs->hw.njet.ctrl_reg = 0xff;  /* Reset On */
    byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
    mdelay(10);
    cs->hw.njet.ctrl_reg = 0x40;  /* Reset Off and status read clear */
    /* now edge triggered for TJ320 GE 13/07/00 */
    byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
    mdelay(10);
    cs->hw.njet.auxd = 0xC0;
    cs->hw.njet.dmactrl = 0;
    byteout(cs->hw.njet.auxa, 0);
    byteout(cs->hw.njet.base + NETJET_AUXCTRL, ~NETJET_ISACIRQ);
    byteout(cs->hw.njet.base + NETJET_IRQMASK1, NETJET_ISACIRQ);
    byteout(cs->hw.njet.auxa, cs->hw.njet.auxd);
}

static int
NETjet_U_card_msg(struct IsdnCardState *cs, int mt, void *arg)
{
    u_long flags;

    switch (mt) {
    case CARD_RESET:
        spin_lock_irqsave(&cs->lock, flags);
        reset_netjet_u(cs);
        spin_unlock_irqrestore(&cs->lock, flags);
        return (0);
    case CARD_RELEASE:
        release_io_netjet(cs);
        return (0);
    case CARD_INIT:
        spin_lock_irqsave(&cs->lock, flags);
        inittiger(cs);
        reset_netjet_u(cs);
        clear_pending_icc_ints(cs);
        initicc(cs);
        /* Reenable all IRQ */
        cs->writeisac(cs, ICC_MASK, 0);
        spin_unlock_irqrestore(&cs->lock, flags);
        return (0);
    case CARD_TEST:
        return (0);
    }
    return (0);
}

static int __devinit nju_pci_probe(struct pci_dev *dev_netjet,
                   struct IsdnCardState *cs)
{
    if (pci_enable_device(dev_netjet))
        return (0);
    pci_set_master(dev_netjet);
    cs->irq = dev_netjet->irq;
    if (!cs->irq) {
        printk(KERN_WARNING "NETspider-U: No IRQ for PCI card found\n");
        return (0);
    }
    cs->hw.njet.base = pci_resource_start(dev_netjet, 0);
    if (!cs->hw.njet.base) {
        printk(KERN_WARNING "NETspider-U: No IO-Adr for PCI card found\n");
        return (0);
    }

    return (1);
}

static int __devinit nju_cs_init(struct IsdnCard *card,
                 struct IsdnCardState *cs)
{
    cs->hw.njet.auxa = cs->hw.njet.base + NETJET_AUXDATA;
    cs->hw.njet.isac = cs->hw.njet.base | NETJET_ISAC_OFF;
    mdelay(10);

    cs->hw.njet.ctrl_reg = 0xff;  /* Reset On */
    byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
    mdelay(10);

    cs->hw.njet.ctrl_reg = 0x00;  /* Reset Off and status read clear */
    byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
    mdelay(10);

    cs->hw.njet.auxd = 0xC0;
    cs->hw.njet.dmactrl = 0;

    byteout(cs->hw.njet.auxa, 0);
    byteout(cs->hw.njet.base + NETJET_AUXCTRL, ~NETJET_ISACIRQ);
    byteout(cs->hw.njet.base + NETJET_IRQMASK1, NETJET_ISACIRQ);
    byteout(cs->hw.njet.auxa, cs->hw.njet.auxd);

    switch (((NETjet_ReadIC(cs, ICC_RBCH) >> 5) & 3))
    {
    case 3:
        return 1;   /* end loop */

    case 0:
        printk(KERN_WARNING "NETspider-U: NETjet-S PCI card found\n");
        return -1;  /* continue looping */

    default:
        printk(KERN_WARNING "NETspider-U: No PCI card found\n");
        return 0;   /* end loop & function */
    }
    return 1;           /* end loop */
}

static int __devinit nju_cs_init_rest(struct IsdnCard *card,
                      struct IsdnCardState *cs)
{
    const int bytecnt = 256;

    printk(KERN_INFO
           "NETspider-U: PCI card configured at %#lx IRQ %d\n",
           cs->hw.njet.base, cs->irq);
    if (!request_region(cs->hw.njet.base, bytecnt, "netspider-u isdn")) {
        printk(KERN_WARNING
               "HiSax: NETspider-U config port %#lx-%#lx "
               "already in use\n",
               cs->hw.njet.base,
               cs->hw.njet.base + bytecnt);
        return (0);
    }
    setup_icc(cs);
    cs->readisac  = &NETjet_ReadIC;
    cs->writeisac = &NETjet_WriteIC;
    cs->readisacfifo  = &NETjet_ReadICfifo;
    cs->writeisacfifo = &NETjet_WriteICfifo;
    cs->BC_Read_Reg  = &dummyrr;
    cs->BC_Write_Reg = &dummywr;
    cs->BC_Send_Data = &netjet_fill_dma;
    cs->cardmsg = &NETjet_U_card_msg;
    cs->irq_func = &netjet_u_interrupt;
    cs->irq_flags |= IRQF_SHARED;
    ICCVersion(cs, "NETspider-U:");

    return (1);
}

static struct pci_dev *dev_netjet __devinitdata = NULL;

int __devinit
setup_netjet_u(struct IsdnCard *card)
{
    int ret;
    struct IsdnCardState *cs = card->cs;
    char tmp[64];

#ifdef __BIG_ENDIAN
#error "not running on big endian machines now"
#endif

    strcpy(tmp, NETjet_U_revision);
    printk(KERN_INFO "HiSax: Traverse Tech. NETspider-U driver Rev. %s\n", HiSax_getrev(tmp));
    if (cs->typ != ISDN_CTYPE_NETJET_U)
        return (0);
    test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);

    for (;;)
    {
        if ((dev_netjet = hisax_find_pci_device(PCI_VENDOR_ID_TIGERJET,
                            PCI_DEVICE_ID_TIGERJET_300,  dev_netjet))) {
            ret = nju_pci_probe(dev_netjet, cs);
            if (!ret)
                return (0);
        } else {
            printk(KERN_WARNING "NETspider-U: No PCI card found\n");
            return (0);
        }

        ret = nju_cs_init(card, cs);
        if (!ret)
            return (0);
        if (ret > 0)
            break;
        /* ret < 0 == continue looping */
    }

    return nju_cs_init_rest(card, cs);
}