fa2db87667c8367f3100d7e071b1a010895ff17e
[linux-2.6.git] / 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 __devinit njs_pci_probe(struct pci_dev *dev_netjet,
152                                    struct IsdnCardState *cs)
153 {
154         int cfg;
155
156         if (pci_enable_device(dev_netjet))
157                 return(0);
158         pci_set_master(dev_netjet);
159         cs->irq = dev_netjet->irq;
160         if (!cs->irq) {
161                 printk(KERN_WARNING "NETjet-S: No IRQ for PCI card found\n");
162                 return(0);
163         }
164         cs->hw.njet.base = pci_resource_start(dev_netjet, 0);
165         if (!cs->hw.njet.base) {
166                 printk(KERN_WARNING "NETjet-S: No IO-Adr for PCI card found\n");
167                 return(0);
168         }
169         /* the TJ300 and TJ320 must be detected, the IRQ handling is different
170          * unfortunatly the chips use the same device ID, but the TJ320 has
171          * the bit20 in status PCI cfg register set
172          */
173         pci_read_config_dword(dev_netjet, 0x04, &cfg);
174         if (cfg & 0x00100000)
175                 cs->subtyp = 1; /* TJ320 */
176         else
177                 cs->subtyp = 0; /* TJ300 */
178         /* 2001/10/04 Christoph Ersfeld, Formula-n Europe AG www.formula-n.com */
179         if ((dev_netjet->subsystem_vendor == 0x55) &&
180                 (dev_netjet->subsystem_device == 0x02)) {
181                 printk(KERN_WARNING "Netjet: You tried to load this driver with an incompatible TigerJet-card\n");
182                 printk(KERN_WARNING "Use type=41 for Formula-n enter:now ISDN PCI and compatible\n");
183                 return(0);
184         }
185         /* end new code */
186
187         return(1);
188 }
189
190 static int __devinit njs_cs_init(struct IsdnCard *card,
191                                  struct IsdnCardState *cs)
192 {
193
194         cs->hw.njet.auxa = cs->hw.njet.base + NETJET_AUXDATA;
195         cs->hw.njet.isac = cs->hw.njet.base | NETJET_ISAC_OFF;
196
197         cs->hw.njet.ctrl_reg = 0xff;  /* Reset On */
198         byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
199         mdelay(10);
200
201         cs->hw.njet.ctrl_reg = 0x00;  /* Reset Off and status read clear */
202         byteout(cs->hw.njet.base + NETJET_CTRL, cs->hw.njet.ctrl_reg);
203         mdelay(10);
204
205         cs->hw.njet.auxd = 0xC0;
206         cs->hw.njet.dmactrl = 0;
207
208         byteout(cs->hw.njet.base + NETJET_AUXCTRL, ~NETJET_ISACIRQ);
209         byteout(cs->hw.njet.base + NETJET_IRQMASK1, NETJET_ISACIRQ);
210         byteout(cs->hw.njet.auxa, cs->hw.njet.auxd);
211
212         switch ( ( ( NETjet_ReadIC( cs, ISAC_RBCH ) >> 5 ) & 3 ) )
213         {
214                 case 0 :
215                         return 1;       /* end loop */
216
217                 case 3 :
218                         printk( KERN_WARNING "NETjet-S: NETspider-U PCI card found\n" );
219                         return -1;      /* continue looping */
220
221                 default :
222                         printk( KERN_WARNING "NETjet-S: No PCI card found\n" );
223                         return 0;       /* end loop & function */
224         }
225         return 1;                       /* end loop */
226 }
227
228 static int __devinit njs_cs_init_rest(struct IsdnCard *card,
229                                       struct IsdnCardState *cs)
230 {
231         const int bytecnt = 256;
232
233         printk(KERN_INFO
234                 "NETjet-S: %s card configured at %#lx IRQ %d\n",
235                 cs->subtyp ? "TJ320" : "TJ300", cs->hw.njet.base, cs->irq);
236         if (!request_region(cs->hw.njet.base, bytecnt, "netjet-s isdn")) {
237                 printk(KERN_WARNING
238                        "HiSax: %s config port %#lx-%#lx already in use\n",
239                        CardType[card->typ],
240                        cs->hw.njet.base,
241                        cs->hw.njet.base + bytecnt);
242                 return (0);
243         }
244         cs->readisac  = &NETjet_ReadIC;
245         cs->writeisac = &NETjet_WriteIC;
246         cs->readisacfifo  = &NETjet_ReadICfifo;
247         cs->writeisacfifo = &NETjet_WriteICfifo;
248         cs->BC_Read_Reg  = &dummyrr;
249         cs->BC_Write_Reg = &dummywr;
250         cs->BC_Send_Data = &netjet_fill_dma;
251         setup_isac(cs);
252         cs->cardmsg = &NETjet_S_card_msg;
253         cs->irq_func = &netjet_s_interrupt;
254         cs->irq_flags |= IRQF_SHARED;
255         ISACVersion(cs, "NETjet-S:");
256
257         return (1);
258 }
259
260 static struct pci_dev *dev_netjet __devinitdata = NULL;
261
262 int __devinit
263 setup_netjet_s(struct IsdnCard *card)
264 {
265         int ret;
266         struct IsdnCardState *cs = card->cs;
267         char tmp[64];
268
269 #ifdef __BIG_ENDIAN
270 #error "not running on big endian machines now"
271 #endif
272         strcpy(tmp, NETjet_S_revision);
273         printk(KERN_INFO "HiSax: Traverse Tech. NETjet-S driver Rev. %s\n", HiSax_getrev(tmp));
274         if (cs->typ != ISDN_CTYPE_NETJET_S)
275                 return(0);
276         test_and_clear_bit(FLG_LOCK_ATOMIC, &cs->HW_Flags);
277
278         for ( ;; )
279         {
280                 if ((dev_netjet = pci_find_device(PCI_VENDOR_ID_TIGERJET,
281                         PCI_DEVICE_ID_TIGERJET_300,  dev_netjet))) {
282                         ret = njs_pci_probe(dev_netjet, cs);
283                         if (!ret)
284                                 return(0);
285                 } else {
286                         printk(KERN_WARNING "NETjet-S: No PCI card found\n");
287                         return(0);
288                 }
289
290                 ret = njs_cs_init(card, cs);
291                 if (!ret)
292                         return(0);
293                 if (ret > 0)
294                         break;
295                 /* otherwise, ret < 0, continue looping */
296         }
297
298         return njs_cs_init_rest(card, cs);
299 }