LXR linux/drivers/isdn/hisax/nj

   1/* $Id: nj_s.c,v 2.13.2.4 2004/01/16 01:53:48 keil Exp $
   2 *
   3 * This software may be used and distributed according to the terms
   4 * of the GNU General Public License, incorporated herein by reference.
   5 *
   6 */
   7
   8#include <linux/init.h>
   9#include "hisax.h"
  10#include "isac.h"
  11#include "isdnl1.h"
  12#include <linux/pci.h>
  13#include <linux/interrupt.h>
  14#include <linux/ppp_defs.h>
  15#include "netjet.h"
  16
  17static const char *NETjet_S_revision = "$Revision: 2.13.2.4 $";
  18
  19static u_char dummyrr(struct IsdnCardState *cs, int chan, u_char off)
  20{
  21        return (5);
  22}
  23
  24static void dummywr(struct IsdnCardState *cs, int chan, u_char off, u_char value)
  25{
  26}
  27
  28static irqreturn_t
  29netjet_s_interrupt(int intno, void *dev_id)
  30{
  31        struct IsdnCardState *cs = dev_id;
  32        u_char val, s1val, s0val;
  33        u_long flags;
  34
  35        spin_lock_irqsave(&cs->lock, flags);
  36        s1val = bytein(cs->hw.njet.base + NETJET_IRQSTAT1);
  37        if (!(s1val & NETJET_ISACIRQ)) {
  38                val = NETjet_ReadIC(cs, ISAC_ISTA);
  39                if (cs->debug & L1_DEB_ISAC)
  40                        debugl1(cs, "tiger: i1 %x %x", s1val, val);
  41                if (val) {
  42                        isac_interrupt(cs, val);
  43                        NETjet_WriteIC(cs, ISAC_MASK, 0xFF);
  44                        NETjet_WriteIC(cs, ISAC_MASK, 0x0);
  45                }
  46                s1val = 1;
  47        } else
  48                s1val = 0;
  49        /*
  50         * read/write stat0 is better, because lower IRQ rate
  51         * Note the IRQ is on for 125 us if a condition match
  52         * thats long on modern CPU and so the IRQ is reentered
  53         * all the time.
  54         */
  55        s0val = bytein(cs->hw.njet.base + NETJET_IRQSTAT0);
  56        if ((s0val | s1val) == 0) { // shared IRQ
  57                spin_unlock_irqrestore(&cs->lock, flags);
  58                return IRQ_NONE;
  59        }
  60        if (s0val)
  61                byteout(cs->hw.njet.base + NETJET_IRQSTAT0, s0val);
  62        /* start new code 13/07/00 GE */
  63        /* set bits in sval to indicate which page is free */
  64        if (inl(cs->hw.njet.base + NETJET_DMA_WRITE_ADR) <
  65            inl(cs->hw.njet.base + NETJET_DMA_WRITE_IRQ))
  66                /* the 2nd write page is free */
  67                s0val = 0x08;
  68        else    /* the 1st write page is free */
  69                s0val = 0x04;
  70        if (inl(cs->hw.njet.base + NETJET_DMA_READ_ADR) <
  71            inl(cs->hw.njet.base + NETJET_DMA_READ_IRQ))
  72                /* the 2nd read page is free */
  73                s0val |= 0x02;
  74        else    /* the 1st read page is free */
  75                s0val |= 0x01;
  76        if (s0val != cs->hw.njet.last_is0) /* we have a DMA interrupt */
  77        {
  78                if (test_and_set_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags)) {
  79                        printk(KERN_WARNING "nj LOCK_ATOMIC s0val %x->%x\n",
  80                               cs->hw.njet.last_is0, s0val);
  81                        spin_unlock_irqrestore(&cs->lock, flags);
  82                        return IRQ_HANDLED;
  83                }
  84                cs->hw.njet.irqstat0 = s0val;
  85                if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_READ) !=
  86                    (cs->hw.njet.last_is0 & NETJET_IRQM0_READ))
  87                        /* we have a read dma int */
  88                        read_tiger(cs);
  89                if ((cs->hw.njet.irqstat0 & NETJET_IRQM0_WRITE) !=
  90                    (cs->hw.njet.last_is0 & NETJET_IRQM0_WRITE))
  91                        /* we have a write dma int */
  92                        write_tiger(cs);
  93                /* end new code 13/07/00 GE */
  94                test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
  95        }
  96        spin_unlock_irqrestore(&cs->lock, flags);
  97        return IRQ_HANDLED;
  98}
  99
 100static void
 101reset_netjet_s(struct IsdnCardState *cs)
 102{
 103        cs->hw.njet.ctrl_reg = 0xff;  /* Reset On */
 104        byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
 105        mdelay(10);
 106        /* now edge triggered for TJ320 GE 13/07/00 */
 107        /* see comment in IRQ function */
 108        if (cs->subtyp) /* TJ320 */
 109                cs->hw.njet.ctrl_reg = 0x40;  /* Reset Off and status read clear */
 110        else
 111                cs->hw.njet.ctrl_reg = 0x00;  /* Reset Off and status read clear */
 112        byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
 113        mdelay(10);
 114        cs->hw.njet.auxd = 0;
 115        cs->hw.njet.dmactrl = 0;
 116        byteout(cs->hw.njet.base + NETJET_AUXCTRL, ~NETJET_ISACIRQ);
 117        byteout(cs->hw.njet.base + NETJET_IRQMASK1, NETJET_ISACIRQ);
 118        byteout(cs->hw.njet.auxa, cs->hw.njet.auxd);
 119}
 120
 121static int
 122NETjet_S_card_msg(struct IsdnCardState *cs, int mt, void *arg)
 123{
 124        u_long flags;
 125
 126        switch (mt) {
 127        case CARD_RESET:
 128                spin_lock_irqsave(&cs->lock, flags);
 129                reset_netjet_s(cs);
 130                spin_unlock_irqrestore(&cs->lock, flags);
 131                return (0);
 132        case CARD_RELEASE:
 133                release_io_netjet(cs);
 134                return (0);
 135        case CARD_INIT:
 136                reset_netjet_s(cs);
 137                inittiger(cs);
 138                spin_lock_irqsave(&cs->lock, flags);
 139                clear_pending_isac_ints(cs);
 140                initisac(cs);
 141                /* Reenable all IRQ */
 142                cs->writeisac(cs, ISAC_MASK, 0);
 143                spin_unlock_irqrestore(&cs->lock, flags);
 144                return (0);
 145        case CARD_TEST:
 146                return (0);
 147        }
 148        return (0);
 149}
 150
 151static int njs_pci_probe(struct pci_dev *dev_netjet, struct IsdnCardState *cs)
 152{
 153        u32 cfg;
 154
 155        if (pci_enable_device(dev_netjet))
 156                return (0);
 157        pci_set_master(dev_netjet);
 158        cs->irq = dev_netjet->irq;
 159        if (!cs->irq) {
 160                printk(KERN_WARNING "NETjet-S: No IRQ for PCI card found\n");
 161                return (0);
 162        }
 163        cs->hw.njet.base = pci_resource_start(dev_netjet, 0);
 164        if (!cs->hw.njet.base) {
 165                printk(KERN_WARNING "NETjet-S: No IO-Adr for PCI card found\n");
 166                return (0);
 167        }
 168        /* the TJ300 and TJ320 must be detected, the IRQ handling is different
 169         * unfortunately the chips use the same device ID, but the TJ320 has
 170         * the bit20 in status PCI cfg register set
 171         */
 172        pci_read_config_dword(dev_netjet, 0x04, &cfg);
 173        if (cfg & 0x00100000)
 174                cs->subtyp = 1; /* TJ320 */
 175        else
 176                cs->subtyp = 0; /* TJ300 */
 177        /* 2001/10/04 Christoph Ersfeld, Formula-n Europe AG www.formula-n.com */
 178        if ((dev_netjet->subsystem_vendor == 0x55) &&
 179            (dev_netjet->subsystem_device == 0x02)) {
 180                printk(KERN_WARNING "Netjet: You tried to load this driver with an incompatible TigerJet-card\n");
 181                printk(KERN_WARNING "Use type=41 for Formula-n enter:now ISDN PCI and compatible\n");
 182                return (0);
 183        }
 184        /* end new code */
 185
 186        return (1);
 187}
 188
 189static int njs_cs_init(struct IsdnCard *card, struct IsdnCardState *cs)
 190{
 191
 192        cs->hw.njet.auxa = cs->hw.njet.base + NETJET_AUXDATA;
 193        cs->hw.njet.isac = cs->hw.njet.base | NETJET_ISAC_OFF;
 194
 195        cs->hw.njet.ctrl_reg = 0xff;  /* Reset On */
 196        byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
 197        mdelay(10);
 198
 199        cs->hw.njet.ctrl_reg = 0x00;  /* Reset Off and status read clear */
 200        byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
 201        mdelay(10);
 202
 203        cs->hw.njet.auxd = 0xC0;
 204        cs->hw.njet.dmactrl = 0;
 205
 206        byteout(cs->hw.njet.base + NETJET_AUXCTRL, ~NETJET_ISACIRQ);
 207        byteout(cs->hw.njet.base + NETJET_IRQMASK1, NETJET_ISACIRQ);
 208        byteout(cs->hw.njet.auxa, cs->hw.njet.auxd);
 209
 210        switch (((NETjet_ReadIC(cs, ISAC_RBCH) >> 5) & 3))
 211        {
 212        case 0:
 213                return 1;       /* end loop */
 214
 215        case 3:
 216                printk(KERN_WARNING "NETjet-S: NETspider-U PCI card found\n");
 217                return -1;      /* continue looping */
 218
 219        default:
 220                printk(KERN_WARNING "NETjet-S: No PCI card found\n");
 221                return 0;       /* end loop & function */
 222        }
 223        return 1;                       /* end loop */
 224}
 225
 226static int njs_cs_init_rest(struct IsdnCard *card, struct IsdnCardState *cs)
 227{
 228        const int bytecnt = 256;
 229
 230        printk(KERN_INFO
 231               "NETjet-S: %s card configured at %#lx IRQ %d\n",
 232               cs->subtyp ? "TJ320" : "TJ300", cs->hw.njet.base, cs->irq);
 233        if (!request_region(cs->hw.njet.base, bytecnt, "netjet-s isdn")) {
 234                printk(KERN_WARNING
 235                       "HiSax: NETjet-S config port %#lx-%#lx already in use\n",
 236                       cs->hw.njet.base,
 237                       cs->hw.njet.base + bytecnt);
 238                return (0);
 239        }
 240        cs->readisac  = &NETjet_ReadIC;
 241        cs->writeisac = &NETjet_WriteIC;
 242        cs->readisacfifo  = &NETjet_ReadICfifo;
 243        cs->writeisacfifo = &NETjet_WriteICfifo;
 244        cs->BC_Read_Reg  = &dummyrr;
 245        cs->BC_Write_Reg = &dummywr;
 246        cs->BC_Send_Data = &netjet_fill_dma;
 247        setup_isac(cs);
 248        cs->cardmsg = &NETjet_S_card_msg;
 249        cs->irq_func = &netjet_s_interrupt;
 250        cs->irq_flags |= IRQF_SHARED;
 251        ISACVersion(cs, "NETjet-S:");
 252
 253        return (1);
 254}
 255
 256static struct pci_dev *dev_netjet = NULL;
 257
 258int setup_netjet_s(struct IsdnCard *card)
 259{
 260        int ret;
 261        struct IsdnCardState *cs = card->cs;
 262        char tmp[64];
 263
 264#ifdef __BIG_ENDIAN
 265#error "not running on big endian machines now"
 266#endif
 267        strcpy(tmp, NETjet_S_revision);
 268        printk(KERN_INFO "HiSax: Traverse Tech. NETjet-S driver Rev. %s\n", HiSax_getrev(tmp));
 269        if (cs->typ != ISDN_CTYPE_NETJET_S)
 270                return (0);
 271        test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
 272
 273        for (;;)
 274        {
 275                if ((dev_netjet = hisax_find_pci_device(PCI_VENDOR_ID_TIGERJET,
 276                                                        PCI_DEVICE_ID_TIGERJET_300,  dev_netjet))) {
 277                        ret = njs_pci_probe(dev_netjet, cs);
 278                        if (!ret)
 279                                return (0);
 280                } else {
 281                        printk(KERN_WARNING "NETjet-S: No PCI card found\n");
 282                        return (0);
 283                }
 284
 285                ret = njs_cs_init(card, cs);
 286                if (!ret)
 287                        return (0);
 288                if (ret > 0)
 289                        break;
 290                /* otherwise, ret < 0, continue looping */
 291        }
 292
 293        return njs_cs_init_rest(card, cs);
 294}
 295