nj_s.c

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/* $Id: nj_s.c,v 2.13.2.4 2004/01/16 01:53:48 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 "isac.h"
#include "isdnl1.h"
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/ppp_defs.h>
#include "netjet.h"

static const char *NETjet_S_revision = "$Revision: 2.13.2.4 $";

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_s_interrupt(int intno, void *dev_id)
{
    struct IsdnCardState *cs = dev_id;
    u_char val, s1val, s0val;
    u_long flags;

    spin_lock_irqsave(&cs->lock, flags);
    s1val = bytein(cs->hw.njet.base + NETJET_IRQSTAT1);
    if (!(s1val & NETJET_ISACIRQ)) {
        val = NETjet_ReadIC(cs, ISAC_ISTA);
        if (cs->debug & L1_DEB_ISAC)
            debugl1(cs, "tiger: i1 %x %x", s1val, val);
        if (val) {
            isac_interrupt(cs, val);
            NETjet_WriteIC(cs, ISAC_MASK, 0xFF);
            NETjet_WriteIC(cs, ISAC_MASK, 0x0);
        }
        s1val = 1;
    } else
        s1val = 0;
    /*
     * read/write stat0 is better, because lower IRQ rate
     * Note the IRQ is on for 125 us if a condition match
     * thats long on modern CPU and so the IRQ is reentered
     * all the time.
     */
    s0val = bytein(cs->hw.njet.base + NETJET_IRQSTAT0);
    if ((s0val | s1val) == 0) { // shared IRQ
        spin_unlock_irqrestore(&cs->lock, flags);
        return IRQ_NONE;
    }
    if (s0val)
        byteout(cs->hw.njet.base + NETJET_IRQSTAT0, s0val);
    /* 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 */
        s0val = 0x08;
    else    /* the 1st write page is free */
        s0val = 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 */
        s0val |= 0x02;
    else    /* the 1st read page is free */
        s0val |= 0x01;
    if (s0val != cs->hw.njet.last_is0) /* we have a DMA interrupt */
    {
        if (test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
            printk(KERN_WARNING "nj LOCK_ATOMIC s0val %x->%x\n",
                   cs->hw.njet.last_is0, s0val);
            spin_unlock_irqrestore(&cs->lock, flags);
            return IRQ_HANDLED;
        }
        cs->hw.njet.irqstat0 = s0val;
        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_s(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);
    /* now edge triggered for TJ320 GE 13/07/00 */
    /* see comment in IRQ function */
    if (cs->subtyp) /* TJ320 */
        cs->hw.njet.ctrl_reg = 0x40;  /* Reset Off and status read clear */
    else
        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 = 0;
    cs->hw.njet.dmactrl = 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_S_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_s(cs);
        spin_unlock_irqrestore(&cs->lock, flags);
        return (0);
    case CARD_RELEASE:
        release_io_netjet(cs);
        return (0);
    case CARD_INIT:
        reset_netjet_s(cs);
        inittiger(cs);
        spin_lock_irqsave(&cs->lock, flags);
        clear_pending_isac_ints(cs);
        initisac(cs);
        /* Reenable all IRQ */
        cs->writeisac(cs, ISAC_MASK, 0);
        spin_unlock_irqrestore(&cs->lock, flags);
        return (0);
    case CARD_TEST:
        return (0);
    }
    return (0);
}

static int __devinit njs_pci_probe(struct pci_dev *dev_netjet,
                   struct IsdnCardState *cs)
{
    u32 cfg;

    if (pci_enable_device(dev_netjet))
        return (0);
    pci_set_master(dev_netjet);
    cs->irq = dev_netjet->irq;
    if (!cs->irq) {
        printk(KERN_WARNING "NETjet-S: 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 "NETjet-S: No IO-Adr for PCI card found\n");
        return (0);
    }
    /* 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(dev_netjet, 0x04, &cfg);
    if (cfg & 0x00100000)
        cs->subtyp = 1; /* TJ320 */
    else
        cs->subtyp = 0; /* TJ300 */
    /* 2001/10/04 Christoph Ersfeld, Formula-n Europe AG www.formula-n.com */
    if ((dev_netjet->subsystem_vendor == 0x55) &&
        (dev_netjet->subsystem_device == 0x02)) {
        printk(KERN_WARNING "Netjet: You tried to load this driver with an incompatible TigerJet-card\n");
        printk(KERN_WARNING "Use type=41 for Formula-n enter:now ISDN PCI and compatible\n");
        return (0);
    }
    /* end new code */

    return (1);
}

static int __devinit njs_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;

    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.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, ISAC_RBCH) >> 5) & 3))
    {
    case 0:
        return 1;   /* end loop */

    case 3:
        printk(KERN_WARNING "NETjet-S: NETspider-U PCI card found\n");
        return -1;  /* continue looping */

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

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

    printk(KERN_INFO
           "NETjet-S: %s card configured at %#lx IRQ %d\n",
           cs->subtyp ? "TJ320" : "TJ300", cs->hw.njet.base, cs->irq);
    if (!request_region(cs->hw.njet.base, bytecnt, "netjet-s isdn")) {
        printk(KERN_WARNING
               "HiSax: NETjet-S config port %#lx-%#lx already in use\n",
               cs->hw.njet.base,
               cs->hw.njet.base + bytecnt);
        return (0);
    }
    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;
    setup_isac(cs);
    cs->cardmsg = &NETjet_S_card_msg;
    cs->irq_func = &netjet_s_interrupt;
    cs->irq_flags |= IRQF_SHARED;
    ISACVersion(cs, "NETjet-S:");

    return (1);
}

static struct pci_dev *dev_netjet __devinitdata = NULL;

int __devinit
setup_netjet_s(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_S_revision);
    printk(KERN_INFO "HiSax: Traverse Tech. NETjet-S driver Rev. %s\n", HiSax_getrev(tmp));
    if (cs->typ != ISDN_CTYPE_NETJET_S)
        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 = njs_pci_probe(dev_netjet, cs);
            if (!ret)
                return (0);
        } else {
            printk(KERN_WARNING "NETjet-S: No PCI card found\n");
            return (0);
        }

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

    return njs_cs_init_rest(card, cs);
}