kernel/drivers/isdn/hisax/nj_s.c

   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
  17 static const char *NETjet_S_revision = "$Revision: 2.13.2.4 $";
  18
  19 static u_char dummyrr(struct IsdnCardState *cs, int chan, u_char off)
  20 {
  21         return (5);
  22 }
  23
  24 static void dummywr(struct IsdnCardState *cs, int chan, u_char off, u_char value)
  25 {
  26 }
  27
  28 static irqreturn_t
  29 netjet_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
 100 static void
 101 reset_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
 121 static int
 122 NETjet_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
 151 static 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
 189 static 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
 226 static 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
 256 static struct pci_dev *dev_netjet = NULL;
 257
 258 int 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 }