Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/drivers/net/sb1000.c

  1 /* sb1000.c: A General Instruments SB1000 driver for linux. */
  2 /*
  3         Written 1998 by Franco Venturi.
  4 
  5         Copyright 1998 by Franco Venturi.
  6         Copyright 1994,1995 by Donald Becker.
  7         Copyright 1993 United States Government as represented by the
  8         Director, National Security Agency.
  9 
 10         This driver is for the General Instruments SB1000 (internal SURFboard)
 11 
 12         The author may be reached as fventuri@mediaone.net
 13 
 14         This program is free software; you can redistribute it
 15         and/or  modify it under  the terms of  the GNU General
 16         Public  License as  published  by  the  Free  Software
 17         Foundation;  either  version 2 of the License, or  (at
 18         your option) any later version.
 19 
 20         Changes:
 21 
 22         981115 Steven Hirsch <shirsch@adelphia.net>
 23 
 24         Linus changed the timer interface.  Should work on all recent
 25         development kernels.
 26 
 27         980608 Steven Hirsch <shirsch@adelphia.net>
 28 
 29         Small changes to make it work with 2.1.x kernels. Hopefully,
 30         nothing major will change before official release of Linux 2.2.
 31 
 32         Merged with 2.2 - Alan Cox
 33 */
 34 
 35 static char version[] = "sb1000.c:v1.1.2 6/01/98 (fventuri@mediaone.net)\n";
 36 
 37 #include <linux/module.h>
 38 #include <linux/kernel.h>
 39 #include <linux/sched.h>
 40 #include <linux/string.h>
 41 #include <linux/interrupt.h>
 42 #include <linux/errno.h>
 43 #include <linux/if_cablemodem.h> /* for SIOGCM/SIOSCM stuff */
 44 #include <linux/in.h>
 45 #include <linux/ioport.h>
 46 #include <linux/netdevice.h>
 47 #include <linux/if_arp.h>
 48 #include <linux/skbuff.h>
 49 #include <linux/delay.h>        /* for udelay() */
 50 #include <linux/etherdevice.h>
 51 #include <linux/pnp.h>
 52 #include <linux/init.h>
 53 #include <linux/bitops.h>
 54 #include <linux/gfp.h>
 55 
 56 #include <asm/io.h>
 57 #include <asm/processor.h>
 58 #include <linux/uaccess.h>
 59 
 60 #ifdef SB1000_DEBUG
 61 static int sb1000_debug = SB1000_DEBUG;
 62 #else
 63 static const int sb1000_debug = 1;
 64 #endif
 65 
 66 static const int SB1000_IO_EXTENT = 8;
 67 /* SB1000 Maximum Receive Unit */
 68 static const int SB1000_MRU = 1500; /* octects */
 69 
 70 #define NPIDS 4
 71 struct sb1000_private {
 72         struct sk_buff *rx_skb[NPIDS];
 73         short rx_dlen[NPIDS];
 74         unsigned int rx_frames;
 75         short rx_error_count;
 76         short rx_error_dpc_count;
 77         unsigned char rx_session_id[NPIDS];
 78         unsigned char rx_frame_id[NPIDS];
 79         unsigned char rx_pkt_type[NPIDS];
 80 };
 81 
 82 /* prototypes for Linux interface */
 83 extern int sb1000_probe(struct net_device *dev);
 84 static int sb1000_open(struct net_device *dev);
 85 static int sb1000_dev_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd);
 86 static netdev_tx_t sb1000_start_xmit(struct sk_buff *skb,
 87                                      struct net_device *dev);
 88 static irqreturn_t sb1000_interrupt(int irq, void *dev_id);
 89 static int sb1000_close(struct net_device *dev);
 90 
 91 
 92 /* SB1000 hardware routines to be used during open/configuration phases */
 93 static int card_wait_for_busy_clear(const int ioaddr[],
 94         const char* name);
 95 static int card_wait_for_ready(const int ioaddr[], const char* name,
 96         unsigned char in[]);
 97 static int card_send_command(const int ioaddr[], const char* name,
 98         const unsigned char out[], unsigned char in[]);
 99 
100 /* SB1000 hardware routines to be used during frame rx interrupt */
101 static int sb1000_wait_for_ready(const int ioaddr[], const char* name);
102 static int sb1000_wait_for_ready_clear(const int ioaddr[],
103         const char* name);
104 static void sb1000_send_command(const int ioaddr[], const char* name,
105         const unsigned char out[]);
106 static void sb1000_read_status(const int ioaddr[], unsigned char in[]);
107 static void sb1000_issue_read_command(const int ioaddr[],
108         const char* name);
109 
110 /* SB1000 commands for open/configuration */
111 static int sb1000_reset(const int ioaddr[], const char* name);
112 static int sb1000_check_CRC(const int ioaddr[], const char* name);
113 static inline int sb1000_start_get_set_command(const int ioaddr[],
114         const char* name);
115 static int sb1000_end_get_set_command(const int ioaddr[],
116         const char* name);
117 static int sb1000_activate(const int ioaddr[], const char* name);
118 static int sb1000_get_firmware_version(const int ioaddr[],
119         const char* name, unsigned char version[], int do_end);
120 static int sb1000_get_frequency(const int ioaddr[], const char* name,
121         int* frequency);
122 static int sb1000_set_frequency(const int ioaddr[], const char* name,
123         int frequency);
124 static int sb1000_get_PIDs(const int ioaddr[], const char* name,
125         short PID[]);
126 static int sb1000_set_PIDs(const int ioaddr[], const char* name,
127         const short PID[]);
128 
129 /* SB1000 commands for frame rx interrupt */
130 static int sb1000_rx(struct net_device *dev);
131 static void sb1000_error_dpc(struct net_device *dev);
132 
133 static const struct pnp_device_id sb1000_pnp_ids[] = {
134         { "GIC1000", 0 },
135         { "", 0 }
136 };
137 MODULE_DEVICE_TABLE(pnp, sb1000_pnp_ids);
138 
139 static const struct net_device_ops sb1000_netdev_ops = {
140         .ndo_open               = sb1000_open,
141         .ndo_start_xmit         = sb1000_start_xmit,
142         .ndo_do_ioctl           = sb1000_dev_ioctl,
143         .ndo_stop               = sb1000_close,
144         .ndo_set_mac_address    = eth_mac_addr,
145         .ndo_validate_addr      = eth_validate_addr,
146 };
147 
148 static int
149 sb1000_probe_one(struct pnp_dev *pdev, const struct pnp_device_id *id)
150 {
151         struct net_device *dev;
152         unsigned short ioaddr[2], irq;
153         unsigned int serial_number;
154         int error = -ENODEV;
155 
156         if (pnp_device_attach(pdev) < 0)
157                 return -ENODEV;
158         if (pnp_activate_dev(pdev) < 0)
159                 goto out_detach;
160 
161         if (!pnp_port_valid(pdev, 0) || !pnp_port_valid(pdev, 1))
162                 goto out_disable;
163         if (!pnp_irq_valid(pdev, 0))
164                 goto out_disable;
165 
166         serial_number = pdev->card->serial;
167 
168         ioaddr[0] = pnp_port_start(pdev, 0);
169         ioaddr[1] = pnp_port_start(pdev, 0);
170 
171         irq = pnp_irq(pdev, 0);
172 
173         if (!request_region(ioaddr[0], 16, "sb1000"))
174                 goto out_disable;
175         if (!request_region(ioaddr[1], 16, "sb1000"))
176                 goto out_release_region0;
177 
178         dev = alloc_etherdev(sizeof(struct sb1000_private));
179         if (!dev) {
180                 error = -ENOMEM;
181                 goto out_release_regions;
182         }
183 
184 
185         dev->base_addr = ioaddr[0];
186         /* mem_start holds the second I/O address */
187         dev->mem_start = ioaddr[1];
188         dev->irq = irq;
189 
190         if (sb1000_debug > 0)
191                 printk(KERN_NOTICE "%s: sb1000 at (%#3.3lx,%#3.3lx), "
192                         "S/N %#8.8x, IRQ %d.\n", dev->name, dev->base_addr,
193                         dev->mem_start, serial_number, dev->irq);
194 
195         /*
196          * The SB1000 is an rx-only cable modem device.  The uplink is a modem
197          * and we do not want to arp on it.
198          */
199         dev->flags = IFF_POINTOPOINT|IFF_NOARP;
200 
201         SET_NETDEV_DEV(dev, &pdev->dev);
202 
203         if (sb1000_debug > 0)
204                 printk(KERN_NOTICE "%s", version);
205 
206         dev->netdev_ops = &sb1000_netdev_ops;
207 
208         /* hardware address is 0:0:serial_number */
209         dev->dev_addr[2]        = serial_number >> 24 & 0xff;
210         dev->dev_addr[3]        = serial_number >> 16 & 0xff;
211         dev->dev_addr[4]        = serial_number >>  8 & 0xff;
212         dev->dev_addr[5]        = serial_number >>  0 & 0xff;
213 
214         pnp_set_drvdata(pdev, dev);
215 
216         error = register_netdev(dev);
217         if (error)
218                 goto out_free_netdev;
219         return 0;
220 
221  out_free_netdev:
222         free_netdev(dev);
223  out_release_regions:
224         release_region(ioaddr[1], 16);
225  out_release_region0:
226         release_region(ioaddr[0], 16);
227  out_disable:
228         pnp_disable_dev(pdev);
229  out_detach:
230         pnp_device_detach(pdev);
231         return error;
232 }
233 
234 static void
235 sb1000_remove_one(struct pnp_dev *pdev)
236 {
237         struct net_device *dev = pnp_get_drvdata(pdev);
238 
239         unregister_netdev(dev);
240         release_region(dev->base_addr, 16);
241         release_region(dev->mem_start, 16);
242         free_netdev(dev);
243 }
244 
245 static struct pnp_driver sb1000_driver = {
246         .name           = "sb1000",
247         .id_table       = sb1000_pnp_ids,
248         .probe          = sb1000_probe_one,
249         .remove         = sb1000_remove_one,
250 };
251 
252 
253 /*
254  * SB1000 hardware routines to be used during open/configuration phases
255  */
256 
257 static const int TimeOutJiffies = (875 * HZ) / 100;
258 
259 /* Card Wait For Busy Clear (cannot be used during an interrupt) */
260 static int
261 card_wait_for_busy_clear(const int ioaddr[], const char* name)
262 {
263         unsigned char a;
264         unsigned long timeout;
265 
266         a = inb(ioaddr[0] + 7);
267         timeout = jiffies + TimeOutJiffies;
268         while (a & 0x80 || a & 0x40) {
269                 /* a little sleep */
270                 yield();
271 
272                 a = inb(ioaddr[0] + 7);
273                 if (time_after_eq(jiffies, timeout)) {
274                         printk(KERN_WARNING "%s: card_wait_for_busy_clear timeout\n",
275                                 name);
276                         return -ETIME;
277                 }
278         }
279 
280         return 0;
281 }
282 
283 /* Card Wait For Ready (cannot be used during an interrupt) */
284 static int
285 card_wait_for_ready(const int ioaddr[], const char* name, unsigned char in[])
286 {
287         unsigned char a;
288         unsigned long timeout;
289 
290         a = inb(ioaddr[1] + 6);
291         timeout = jiffies + TimeOutJiffies;
292         while (a & 0x80 || !(a & 0x40)) {
293                 /* a little sleep */
294                 yield();
295 
296                 a = inb(ioaddr[1] + 6);
297                 if (time_after_eq(jiffies, timeout)) {
298                         printk(KERN_WARNING "%s: card_wait_for_ready timeout\n",
299                                 name);
300                         return -ETIME;
301                 }
302         }
303 
304         in[1] = inb(ioaddr[0] + 1);
305         in[2] = inb(ioaddr[0] + 2);
306         in[3] = inb(ioaddr[0] + 3);
307         in[4] = inb(ioaddr[0] + 4);
308         in[0] = inb(ioaddr[0] + 5);
309         in[6] = inb(ioaddr[0] + 6);
310         in[5] = inb(ioaddr[1] + 6);
311         return 0;
312 }
313 
314 /* Card Send Command (cannot be used during an interrupt) */
315 static int
316 card_send_command(const int ioaddr[], const char* name,
317         const unsigned char out[], unsigned char in[])
318 {
319         int status, x;
320 
321         if ((status = card_wait_for_busy_clear(ioaddr, name)))
322                 return status;
323         outb(0xa0, ioaddr[0] + 6);
324         outb(out[2], ioaddr[0] + 1);
325         outb(out[3], ioaddr[0] + 2);
326         outb(out[4], ioaddr[0] + 3);
327         outb(out[5], ioaddr[0] + 4);
328         outb(out[1], ioaddr[0] + 5);
329         outb(0xa0, ioaddr[0] + 6);
330         outb(out[0], ioaddr[0] + 7);
331         if (out[0] != 0x20 && out[0] != 0x30) {
332                 if ((status = card_wait_for_ready(ioaddr, name, in)))
333                         return status;
334                 inb(ioaddr[0] + 7);
335                 if (sb1000_debug > 3)
336                         printk(KERN_DEBUG "%s: card_send_command "
337                                 "out: %02x%02x%02x%02x%02x%02x  "
338                                 "in: %02x%02x%02x%02x%02x%02x%02x\n", name,
339                                 out[0], out[1], out[2], out[3], out[4], out[5],
340                                 in[0], in[1], in[2], in[3], in[4], in[5], in[6]);
341         } else {
342                 if (sb1000_debug > 3)
343                         printk(KERN_DEBUG "%s: card_send_command "
344                                 "out: %02x%02x%02x%02x%02x%02x\n", name,
345                                 out[0], out[1], out[2], out[3], out[4], out[5]);
346         }
347 
348         if (out[1] == 0x1b) {
349                 x = (out[2] == 0x02);
350         } else {
351                 if (out[0] >= 0x80 && in[0] != (out[1] | 0x80))
352                         return -EIO;
353         }
354         return 0;
355 }
356 
357 
358 /*
359  * SB1000 hardware routines to be used during frame rx interrupt
360  */
361 static const int Sb1000TimeOutJiffies = 7 * HZ;
362 
363 /* Card Wait For Ready (to be used during frame rx) */
364 static int
365 sb1000_wait_for_ready(const int ioaddr[], const char* name)
366 {
367         unsigned long timeout;
368 
369         timeout = jiffies + Sb1000TimeOutJiffies;
370         while (inb(ioaddr[1] + 6) & 0x80) {
371                 if (time_after_eq(jiffies, timeout)) {
372                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
373                                 name);
374                         return -ETIME;
375                 }
376         }
377         timeout = jiffies + Sb1000TimeOutJiffies;
378         while (!(inb(ioaddr[1] + 6) & 0x40)) {
379                 if (time_after_eq(jiffies, timeout)) {
380                         printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
381                                 name);
382                         return -ETIME;
383                 }
384         }
385         inb(ioaddr[0] + 7);
386         return 0;
387 }
388 
389 /* Card Wait For Ready Clear (to be used during frame rx) */
390 static int
391 sb1000_wait_for_ready_clear(const int ioaddr[], const char* name)
392 {
393         unsigned long timeout;
394 
395         timeout = jiffies + Sb1000TimeOutJiffies;
396         while (inb(ioaddr[1] + 6) & 0x80) {
397                 if (time_after_eq(jiffies, timeout)) {
398                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
399                                 name);
400                         return -ETIME;
401                 }
402         }
403         timeout = jiffies + Sb1000TimeOutJiffies;
404         while (inb(ioaddr[1] + 6) & 0x40) {
405                 if (time_after_eq(jiffies, timeout)) {
406                         printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
407                                 name);
408                         return -ETIME;
409                 }
410         }
411         return 0;
412 }
413 
414 /* Card Send Command (to be used during frame rx) */
415 static void
416 sb1000_send_command(const int ioaddr[], const char* name,
417         const unsigned char out[])
418 {
419         outb(out[2], ioaddr[0] + 1);
420         outb(out[3], ioaddr[0] + 2);
421         outb(out[4], ioaddr[0] + 3);
422         outb(out[5], ioaddr[0] + 4);
423         outb(out[1], ioaddr[0] + 5);
424         outb(out[0], ioaddr[0] + 7);
425         if (sb1000_debug > 3)
426                 printk(KERN_DEBUG "%s: sb1000_send_command out: %02x%02x%02x%02x"
427                         "%02x%02x\n", name, out[0], out[1], out[2], out[3], out[4], out[5]);
428 }
429 
430 /* Card Read Status (to be used during frame rx) */
431 static void
432 sb1000_read_status(const int ioaddr[], unsigned char in[])
433 {
434         in[1] = inb(ioaddr[0] + 1);
435         in[2] = inb(ioaddr[0] + 2);
436         in[3] = inb(ioaddr[0] + 3);
437         in[4] = inb(ioaddr[0] + 4);
438         in[0] = inb(ioaddr[0] + 5);
439 }
440 
441 /* Issue Read Command (to be used during frame rx) */
442 static void
443 sb1000_issue_read_command(const int ioaddr[], const char* name)
444 {
445         static const unsigned char Command0[6] = {0x20, 0x00, 0x00, 0x01, 0x00, 0x00};
446 
447         sb1000_wait_for_ready_clear(ioaddr, name);
448         outb(0xa0, ioaddr[0] + 6);
449         sb1000_send_command(ioaddr, name, Command0);
450 }
451 
452 
453 /*
454  * SB1000 commands for open/configuration
455  */
456 /* reset SB1000 card */
457 static int
458 sb1000_reset(const int ioaddr[], const char* name)
459 {
460         static const unsigned char Command0[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
461 
462         unsigned char st[7];
463         int port, status;
464 
465         port = ioaddr[1] + 6;
466         outb(0x4, port);
467         inb(port);
468         udelay(1000);
469         outb(0x0, port);
470         inb(port);
471         ssleep(1);
472         outb(0x4, port);
473         inb(port);
474         udelay(1000);
475         outb(0x0, port);
476         inb(port);
477         udelay(0);
478 
479         if ((status = card_send_command(ioaddr, name, Command0, st)))
480                 return status;
481         if (st[3] != 0xf0)
482                 return -EIO;
483         return 0;
484 }
485 
486 /* check SB1000 firmware CRC */
487 static int
488 sb1000_check_CRC(const int ioaddr[], const char* name)
489 {
490         static const unsigned char Command0[6] = {0x80, 0x1f, 0x00, 0x00, 0x00, 0x00};
491 
492         unsigned char st[7];
493         int crc, status;
494 
495         /* check CRC */
496         if ((status = card_send_command(ioaddr, name, Command0, st)))
497                 return status;
498         if (st[1] != st[3] || st[2] != st[4])
499                 return -EIO;
500         crc = st[1] << 8 | st[2];
501         return 0;
502 }
503 
504 static inline int
505 sb1000_start_get_set_command(const int ioaddr[], const char* name)
506 {
507         static const unsigned char Command0[6] = {0x80, 0x1b, 0x00, 0x00, 0x00, 0x00};
508 
509         unsigned char st[7];
510 
511         return card_send_command(ioaddr, name, Command0, st);
512 }
513 
514 static int
515 sb1000_end_get_set_command(const int ioaddr[], const char* name)
516 {
517         static const unsigned char Command0[6] = {0x80, 0x1b, 0x02, 0x00, 0x00, 0x00};
518         static const unsigned char Command1[6] = {0x20, 0x00, 0x00, 0x00, 0x00, 0x00};
519 
520         unsigned char st[7];
521         int status;
522 
523         if ((status = card_send_command(ioaddr, name, Command0, st)))
524                 return status;
525         return card_send_command(ioaddr, name, Command1, st);
526 }
527 
528 static int
529 sb1000_activate(const int ioaddr[], const char* name)
530 {
531         static const unsigned char Command0[6] = {0x80, 0x11, 0x00, 0x00, 0x00, 0x00};
532         static const unsigned char Command1[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
533 
534         unsigned char st[7];
535         int status;
536 
537         ssleep(1);
538         if ((status = card_send_command(ioaddr, name, Command0, st)))
539                 return status;
540         if ((status = card_send_command(ioaddr, name, Command1, st)))
541                 return status;
542         if (st[3] != 0xf1) {
543         if ((status = sb1000_start_get_set_command(ioaddr, name)))
544                         return status;
545                 return -EIO;
546         }
547         udelay(1000);
548     return sb1000_start_get_set_command(ioaddr, name);
549 }
550 
551 /* get SB1000 firmware version */
552 static int
553 sb1000_get_firmware_version(const int ioaddr[], const char* name,
554         unsigned char version[], int do_end)
555 {
556         static const unsigned char Command0[6] = {0x80, 0x23, 0x00, 0x00, 0x00, 0x00};
557 
558         unsigned char st[7];
559         int status;
560 
561         if ((status = sb1000_start_get_set_command(ioaddr, name)))
562                 return status;
563         if ((status = card_send_command(ioaddr, name, Command0, st)))
564                 return status;
565         if (st[0] != 0xa3)
566                 return -EIO;
567         version[0] = st[1];
568         version[1] = st[2];
569         if (do_end)
570                 return sb1000_end_get_set_command(ioaddr, name);
571         else
572                 return 0;
573 }
574 
575 /* get SB1000 frequency */
576 static int
577 sb1000_get_frequency(const int ioaddr[], const char* name, int* frequency)
578 {
579         static const unsigned char Command0[6] = {0x80, 0x44, 0x00, 0x00, 0x00, 0x00};
580 
581         unsigned char st[7];
582         int status;
583 
584         udelay(1000);
585         if ((status = sb1000_start_get_set_command(ioaddr, name)))
586                 return status;
587         if ((status = card_send_command(ioaddr, name, Command0, st)))
588                 return status;
589         *frequency = ((st[1] << 8 | st[2]) << 8 | st[3]) << 8 | st[4];
590         return sb1000_end_get_set_command(ioaddr, name);
591 }
592 
593 /* set SB1000 frequency */
594 static int
595 sb1000_set_frequency(const int ioaddr[], const char* name, int frequency)
596 {
597         unsigned char st[7];
598         int status;
599         unsigned char Command0[6] = {0x80, 0x29, 0x00, 0x00, 0x00, 0x00};
600 
601         const int FrequencyLowerLimit = 57000;
602         const int FrequencyUpperLimit = 804000;
603 
604         if (frequency < FrequencyLowerLimit || frequency > FrequencyUpperLimit) {
605                 printk(KERN_ERR "%s: frequency chosen (%d kHz) is not in the range "
606                         "[%d,%d] kHz\n", name, frequency, FrequencyLowerLimit,
607                         FrequencyUpperLimit);
608                 return -EINVAL;
609         }
610         udelay(1000);
611         if ((status = sb1000_start_get_set_command(ioaddr, name)))
612                 return status;
613         Command0[5] = frequency & 0xff;
614         frequency >>= 8;
615         Command0[4] = frequency & 0xff;
616         frequency >>= 8;
617         Command0[3] = frequency & 0xff;
618         frequency >>= 8;
619         Command0[2] = frequency & 0xff;
620         return card_send_command(ioaddr, name, Command0, st);
621 }
622 
623 /* get SB1000 PIDs */
624 static int
625 sb1000_get_PIDs(const int ioaddr[], const char* name, short PID[])
626 {
627         static const unsigned char Command0[6] = {0x80, 0x40, 0x00, 0x00, 0x00, 0x00};
628         static const unsigned char Command1[6] = {0x80, 0x41, 0x00, 0x00, 0x00, 0x00};
629         static const unsigned char Command2[6] = {0x80, 0x42, 0x00, 0x00, 0x00, 0x00};
630         static const unsigned char Command3[6] = {0x80, 0x43, 0x00, 0x00, 0x00, 0x00};
631 
632         unsigned char st[7];
633         int status;
634 
635         udelay(1000);
636         if ((status = sb1000_start_get_set_command(ioaddr, name)))
637                 return status;
638 
639         if ((status = card_send_command(ioaddr, name, Command0, st)))
640                 return status;
641         PID[0] = st[1] << 8 | st[2];
642 
643         if ((status = card_send_command(ioaddr, name, Command1, st)))
644                 return status;
645         PID[1] = st[1] << 8 | st[2];
646 
647         if ((status = card_send_command(ioaddr, name, Command2, st)))
648                 return status;
649         PID[2] = st[1] << 8 | st[2];
650 
651         if ((status = card_send_command(ioaddr, name, Command3, st)))
652                 return status;
653         PID[3] = st[1] << 8 | st[2];
654 
655         return sb1000_end_get_set_command(ioaddr, name);
656 }
657 
658 /* set SB1000 PIDs */
659 static int
660 sb1000_set_PIDs(const int ioaddr[], const char* name, const short PID[])
661 {
662         static const unsigned char Command4[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
663 
664         unsigned char st[7];
665         short p;
666         int status;
667         unsigned char Command0[6] = {0x80, 0x31, 0x00, 0x00, 0x00, 0x00};
668         unsigned char Command1[6] = {0x80, 0x32, 0x00, 0x00, 0x00, 0x00};
669         unsigned char Command2[6] = {0x80, 0x33, 0x00, 0x00, 0x00, 0x00};
670         unsigned char Command3[6] = {0x80, 0x34, 0x00, 0x00, 0x00, 0x00};
671 
672         udelay(1000);
673         if ((status = sb1000_start_get_set_command(ioaddr, name)))
674                 return status;
675 
676         p = PID[0];
677         Command0[3] = p & 0xff;
678         p >>= 8;
679         Command0[2] = p & 0xff;
680         if ((status = card_send_command(ioaddr, name, Command0, st)))
681                 return status;
682 
683         p = PID[1];
684         Command1[3] = p & 0xff;
685         p >>= 8;
686         Command1[2] = p & 0xff;
687         if ((status = card_send_command(ioaddr, name, Command1, st)))
688                 return status;
689 
690         p = PID[2];
691         Command2[3] = p & 0xff;
692         p >>= 8;
693         Command2[2] = p & 0xff;
694         if ((status = card_send_command(ioaddr, name, Command2, st)))
695                 return status;
696 
697         p = PID[3];
698         Command3[3] = p & 0xff;
699         p >>= 8;
700         Command3[2] = p & 0xff;
701         if ((status = card_send_command(ioaddr, name, Command3, st)))
702                 return status;
703 
704         if ((status = card_send_command(ioaddr, name, Command4, st)))
705                 return status;
706         return sb1000_end_get_set_command(ioaddr, name);
707 }
708 
709 
710 static void
711 sb1000_print_status_buffer(const char* name, unsigned char st[],
712         unsigned char buffer[], int size)
713 {
714         int i, j, k;
715 
716         printk(KERN_DEBUG "%s: status: %02x %02x\n", name, st[0], st[1]);
717         if (buffer[24] == 0x08 && buffer[25] == 0x00 && buffer[26] == 0x45) {
718                 printk(KERN_DEBUG "%s: length: %d protocol: %d from: %d.%d.%d.%d:%d "
719                         "to %d.%d.%d.%d:%d\n", name, buffer[28] << 8 | buffer[29],
720                         buffer[35], buffer[38], buffer[39], buffer[40], buffer[41],
721             buffer[46] << 8 | buffer[47],
722                         buffer[42], buffer[43], buffer[44], buffer[45],
723             buffer[48] << 8 | buffer[49]);
724         } else {
725                 for (i = 0, k = 0; i < (size + 7) / 8; i++) {
726                         printk(KERN_DEBUG "%s: %s", name, i ? "       " : "buffer:");
727                         for (j = 0; j < 8 && k < size; j++, k++)
728                                 printk(" %02x", buffer[k]);
729                         printk("\n");
730                 }
731         }
732 }
733 
734 /*
735  * SB1000 commands for frame rx interrupt
736  */
737 /* receive a single frame and assemble datagram
738  * (this is the heart of the interrupt routine)
739  */
740 static int
741 sb1000_rx(struct net_device *dev)
742 {
743 
744 #define FRAMESIZE 184
745         unsigned char st[2], buffer[FRAMESIZE], session_id, frame_id;
746         short dlen;
747         int ioaddr, ns;
748         unsigned int skbsize;
749         struct sk_buff *skb;
750         struct sb1000_private *lp = netdev_priv(dev);
751         struct net_device_stats *stats = &dev->stats;
752 
753         /* SB1000 frame constants */
754         const int FrameSize = FRAMESIZE;
755         const int NewDatagramHeaderSkip = 8;
756         const int NewDatagramHeaderSize = NewDatagramHeaderSkip + 18;
757         const int NewDatagramDataSize = FrameSize - NewDatagramHeaderSize;
758         const int ContDatagramHeaderSkip = 7;
759         const int ContDatagramHeaderSize = ContDatagramHeaderSkip + 1;
760         const int ContDatagramDataSize = FrameSize - ContDatagramHeaderSize;
761         const int TrailerSize = 4;
762 
763         ioaddr = dev->base_addr;
764 
765         insw(ioaddr, (unsigned short*) st, 1);
766 #ifdef XXXDEBUG
767 printk("cm0: received: %02x %02x\n", st[0], st[1]);
768 #endif /* XXXDEBUG */
769         lp->rx_frames++;
770 
771         /* decide if it is a good or bad frame */
772         for (ns = 0; ns < NPIDS; ns++) {
773                 session_id = lp->rx_session_id[ns];
774                 frame_id = lp->rx_frame_id[ns];
775                 if (st[0] == session_id) {
776                         if (st[1] == frame_id || (!frame_id && (st[1] & 0xf0) == 0x30)) {
777                                 goto good_frame;
778                         } else if ((st[1] & 0xf0) == 0x30 && (st[0] & 0x40)) {
779                                 goto skipped_frame;
780                         } else {
781                                 goto bad_frame;
782                         }
783                 } else if (st[0] == (session_id | 0x40)) {
784                         if ((st[1] & 0xf0) == 0x30) {
785                                 goto skipped_frame;
786                         } else {
787                                 goto bad_frame;
788                         }
789                 }
790         }
791         goto bad_frame;
792 
793 skipped_frame:
794         stats->rx_frame_errors++;
795         skb = lp->rx_skb[ns];
796         if (sb1000_debug > 1)
797                 printk(KERN_WARNING "%s: missing frame(s): got %02x %02x "
798                         "expecting %02x %02x\n", dev->name, st[0], st[1],
799                         skb ? session_id : session_id | 0x40, frame_id);
800         if (skb) {
801                 dev_kfree_skb(skb);
802                 skb = NULL;
803         }
804 
805 good_frame:
806         lp->rx_frame_id[ns] = 0x30 | ((st[1] + 1) & 0x0f);
807         /* new datagram */
808         if (st[0] & 0x40) {
809                 /* get data length */
810                 insw(ioaddr, buffer, NewDatagramHeaderSize / 2);
811 #ifdef XXXDEBUG
812 printk("cm0: IP identification: %02x%02x  fragment offset: %02x%02x\n", buffer[30], buffer[31], buffer[32], buffer[33]);
813 #endif /* XXXDEBUG */
814                 if (buffer[0] != NewDatagramHeaderSkip) {
815                         if (sb1000_debug > 1)
816                                 printk(KERN_WARNING "%s: new datagram header skip error: "
817                                         "got %02x expecting %02x\n", dev->name, buffer[0],
818                                         NewDatagramHeaderSkip);
819                         stats->rx_length_errors++;
820                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
821                         goto bad_frame_next;
822                 }
823                 dlen = ((buffer[NewDatagramHeaderSkip + 3] & 0x0f) << 8 |
824                         buffer[NewDatagramHeaderSkip + 4]) - 17;
825                 if (dlen > SB1000_MRU) {
826                         if (sb1000_debug > 1)
827                                 printk(KERN_WARNING "%s: datagram length (%d) greater "
828                                         "than MRU (%d)\n", dev->name, dlen, SB1000_MRU);
829                         stats->rx_length_errors++;
830                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
831                         goto bad_frame_next;
832                 }
833                 lp->rx_dlen[ns] = dlen;
834                 /* compute size to allocate for datagram */
835                 skbsize = dlen + FrameSize;
836                 if ((skb = alloc_skb(skbsize, GFP_ATOMIC)) == NULL) {
837                         if (sb1000_debug > 1)
838                                 printk(KERN_WARNING "%s: can't allocate %d bytes long "
839                                         "skbuff\n", dev->name, skbsize);
840                         stats->rx_dropped++;
841                         insw(ioaddr, buffer, NewDatagramDataSize / 2);
842                         goto dropped_frame;
843                 }
844                 skb->dev = dev;
845                 skb_reset_mac_header(skb);
846                 skb->protocol = (unsigned short) buffer[NewDatagramHeaderSkip + 16];
847                 insw(ioaddr, skb_put(skb, NewDatagramDataSize),
848                         NewDatagramDataSize / 2);
849                 lp->rx_skb[ns] = skb;
850         } else {
851                 /* continuation of previous datagram */
852                 insw(ioaddr, buffer, ContDatagramHeaderSize / 2);
853                 if (buffer[0] != ContDatagramHeaderSkip) {
854                         if (sb1000_debug > 1)
855                                 printk(KERN_WARNING "%s: cont datagram header skip error: "
856                                         "got %02x expecting %02x\n", dev->name, buffer[0],
857                                         ContDatagramHeaderSkip);
858                         stats->rx_length_errors++;
859                         insw(ioaddr, buffer, ContDatagramDataSize / 2);
860                         goto bad_frame_next;
861                 }
862                 skb = lp->rx_skb[ns];
863                 insw(ioaddr, skb_put(skb, ContDatagramDataSize),
864                         ContDatagramDataSize / 2);
865                 dlen = lp->rx_dlen[ns];
866         }
867         if (skb->len < dlen + TrailerSize) {
868                 lp->rx_session_id[ns] &= ~0x40;
869                 return 0;
870         }
871 
872         /* datagram completed: send to upper level */
873         skb_trim(skb, dlen);
874         netif_rx(skb);
875         stats->rx_bytes+=dlen;
876         stats->rx_packets++;
877         lp->rx_skb[ns] = NULL;
878         lp->rx_session_id[ns] |= 0x40;
879         return 0;
880 
881 bad_frame:
882         insw(ioaddr, buffer, FrameSize / 2);
883         if (sb1000_debug > 1)
884                 printk(KERN_WARNING "%s: frame error: got %02x %02x\n",
885                         dev->name, st[0], st[1]);
886         stats->rx_frame_errors++;
887 bad_frame_next:
888         if (sb1000_debug > 2)
889                 sb1000_print_status_buffer(dev->name, st, buffer, FrameSize);
890 dropped_frame:
891         stats->rx_errors++;
892         if (ns < NPIDS) {
893                 if ((skb = lp->rx_skb[ns])) {
894                         dev_kfree_skb(skb);
895                         lp->rx_skb[ns] = NULL;
896                 }
897                 lp->rx_session_id[ns] |= 0x40;
898         }
899         return -1;
900 }
901 
902 static void
903 sb1000_error_dpc(struct net_device *dev)
904 {
905         static const unsigned char Command0[6] = {0x80, 0x26, 0x00, 0x00, 0x00, 0x00};
906 
907         char *name;
908         unsigned char st[5];
909         int ioaddr[2];
910         struct sb1000_private *lp = netdev_priv(dev);
911         const int ErrorDpcCounterInitialize = 200;
912 
913         ioaddr[0] = dev->base_addr;
914         /* mem_start holds the second I/O address */
915         ioaddr[1] = dev->mem_start;
916         name = dev->name;
917 
918         sb1000_wait_for_ready_clear(ioaddr, name);
919         sb1000_send_command(ioaddr, name, Command0);
920         sb1000_wait_for_ready(ioaddr, name);
921         sb1000_read_status(ioaddr, st);
922         if (st[1] & 0x10)
923                 lp->rx_error_dpc_count = ErrorDpcCounterInitialize;
924 }
925 
926 
927 /*
928  * Linux interface functions
929  */
930 static int
931 sb1000_open(struct net_device *dev)
932 {
933         char *name;
934         int ioaddr[2], status;
935         struct sb1000_private *lp = netdev_priv(dev);
936         const unsigned short FirmwareVersion[] = {0x01, 0x01};
937 
938         ioaddr[0] = dev->base_addr;
939         /* mem_start holds the second I/O address */
940         ioaddr[1] = dev->mem_start;
941         name = dev->name;
942 
943         /* initialize sb1000 */
944         if ((status = sb1000_reset(ioaddr, name)))
945                 return status;
946         ssleep(1);
947         if ((status = sb1000_check_CRC(ioaddr, name)))
948                 return status;
949 
950         /* initialize private data before board can catch interrupts */
951         lp->rx_skb[0] = NULL;
952         lp->rx_skb[1] = NULL;
953         lp->rx_skb[2] = NULL;
954         lp->rx_skb[3] = NULL;
955         lp->rx_dlen[0] = 0;
956         lp->rx_dlen[1] = 0;
957         lp->rx_dlen[2] = 0;
958         lp->rx_dlen[3] = 0;
959         lp->rx_frames = 0;
960         lp->rx_error_count = 0;
961         lp->rx_error_dpc_count = 0;
962         lp->rx_session_id[0] = 0x50;
963         lp->rx_session_id[1] = 0x48;
964         lp->rx_session_id[2] = 0x44;
965         lp->rx_session_id[3] = 0x42;
966         lp->rx_frame_id[0] = 0;
967         lp->rx_frame_id[1] = 0;
968         lp->rx_frame_id[2] = 0;
969         lp->rx_frame_id[3] = 0;
970         if (request_irq(dev->irq, sb1000_interrupt, 0, "sb1000", dev)) {
971                 return -EAGAIN;
972         }
973 
974         if (sb1000_debug > 2)
975                 printk(KERN_DEBUG "%s: Opening, IRQ %d\n", name, dev->irq);
976 
977         /* Activate board and check firmware version */
978         udelay(1000);
979         if ((status = sb1000_activate(ioaddr, name)))
980                 return status;
981         udelay(0);
982         if ((status = sb1000_get_firmware_version(ioaddr, name, version, 0)))
983                 return status;
984         if (version[0] != FirmwareVersion[0] || version[1] != FirmwareVersion[1])
985                 printk(KERN_WARNING "%s: found firmware version %x.%02x "
986                         "(should be %x.%02x)\n", name, version[0], version[1],
987                         FirmwareVersion[0], FirmwareVersion[1]);
988 
989 
990         netif_start_queue(dev);
991         return 0;                                       /* Always succeed */
992 }
993 
994 static int sb1000_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
995 {
996         char* name;
997         unsigned char version[2];
998         short PID[4];
999         int ioaddr[2], status, frequency;
1000         unsigned int stats[5];
1001         struct sb1000_private *lp = netdev_priv(dev);
1002 
1003         if (!(dev && dev->flags & IFF_UP))
1004                 return -ENODEV;
1005 
1006         ioaddr[0] = dev->base_addr;
1007         /* mem_start holds the second I/O address */
1008         ioaddr[1] = dev->mem_start;
1009         name = dev->name;
1010 
1011         switch (cmd) {
1012         case SIOCGCMSTATS:              /* get statistics */
1013                 stats[0] = dev->stats.rx_bytes;
1014                 stats[1] = lp->rx_frames;
1015                 stats[2] = dev->stats.rx_packets;
1016                 stats[3] = dev->stats.rx_errors;
1017                 stats[4] = dev->stats.rx_dropped;
1018                 if(copy_to_user(ifr->ifr_data, stats, sizeof(stats)))
1019                         return -EFAULT;
1020                 status = 0;
1021                 break;
1022 
1023         case SIOCGCMFIRMWARE:           /* get firmware version */
1024                 if ((status = sb1000_get_firmware_version(ioaddr, name, version, 1)))
1025                         return status;
1026                 if(copy_to_user(ifr->ifr_data, version, sizeof(version)))
1027                         return -EFAULT;
1028                 break;
1029 
1030         case SIOCGCMFREQUENCY:          /* get frequency */
1031                 if ((status = sb1000_get_frequency(ioaddr, name, &frequency)))
1032                         return status;
1033                 if(put_user(frequency, (int __user *) ifr->ifr_data))
1034                         return -EFAULT;
1035                 break;
1036 
1037         case SIOCSCMFREQUENCY:          /* set frequency */
1038                 if (!capable(CAP_NET_ADMIN))
1039                         return -EPERM;
1040                 if(get_user(frequency, (int __user *) ifr->ifr_data))
1041                         return -EFAULT;
1042                 if ((status = sb1000_set_frequency(ioaddr, name, frequency)))
1043                         return status;
1044                 break;
1045 
1046         case SIOCGCMPIDS:                       /* get PIDs */
1047                 if ((status = sb1000_get_PIDs(ioaddr, name, PID)))
1048                         return status;
1049                 if(copy_to_user(ifr->ifr_data, PID, sizeof(PID)))
1050                         return -EFAULT;
1051                 break;
1052 
1053         case SIOCSCMPIDS:                       /* set PIDs */
1054                 if (!capable(CAP_NET_ADMIN))
1055                         return -EPERM;
1056                 if(copy_from_user(PID, ifr->ifr_data, sizeof(PID)))
1057                         return -EFAULT;
1058                 if ((status = sb1000_set_PIDs(ioaddr, name, PID)))
1059                         return status;
1060                 /* set session_id, frame_id and pkt_type too */
1061                 lp->rx_session_id[0] = 0x50 | (PID[0] & 0x0f);
1062                 lp->rx_session_id[1] = 0x48;
1063                 lp->rx_session_id[2] = 0x44;
1064                 lp->rx_session_id[3] = 0x42;
1065                 lp->rx_frame_id[0] = 0;
1066                 lp->rx_frame_id[1] = 0;
1067                 lp->rx_frame_id[2] = 0;
1068                 lp->rx_frame_id[3] = 0;
1069                 break;
1070 
1071         default:
1072                 status = -EINVAL;
1073                 break;
1074         }
1075         return status;
1076 }
1077 
1078 /* transmit function: do nothing since SB1000 can't send anything out */
1079 static netdev_tx_t
1080 sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
1081 {
1082         printk(KERN_WARNING "%s: trying to transmit!!!\n", dev->name);
1083         /* sb1000 can't xmit datagrams */
1084         dev_kfree_skb(skb);
1085         return NETDEV_TX_OK;
1086 }
1087 
1088 /* SB1000 interrupt handler. */
1089 static irqreturn_t sb1000_interrupt(int irq, void *dev_id)
1090 {
1091         static const unsigned char Command0[6] = {0x80, 0x2c, 0x00, 0x00, 0x00, 0x00};
1092         static const unsigned char Command1[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
1093 
1094         char *name;
1095         unsigned char st;
1096         int ioaddr[2];
1097         struct net_device *dev = dev_id;
1098         struct sb1000_private *lp = netdev_priv(dev);
1099 
1100         const int MaxRxErrorCount = 6;
1101 
1102         ioaddr[0] = dev->base_addr;
1103         /* mem_start holds the second I/O address */
1104         ioaddr[1] = dev->mem_start;
1105         name = dev->name;
1106 
1107         /* is it a good interrupt? */
1108         st = inb(ioaddr[1] + 6);
1109         if (!(st & 0x08 && st & 0x20)) {
1110                 return IRQ_NONE;
1111         }
1112 
1113         if (sb1000_debug > 3)
1114                 printk(KERN_DEBUG "%s: entering interrupt\n", dev->name);
1115 
1116         st = inb(ioaddr[0] + 7);
1117         if (sb1000_rx(dev))
1118                 lp->rx_error_count++;
1119 #ifdef SB1000_DELAY
1120         udelay(SB1000_DELAY);
1121 #endif /* SB1000_DELAY */
1122         sb1000_issue_read_command(ioaddr, name);
1123         if (st & 0x01) {
1124                 sb1000_error_dpc(dev);
1125                 sb1000_issue_read_command(ioaddr, name);
1126         }
1127         if (lp->rx_error_dpc_count && !(--lp->rx_error_dpc_count)) {
1128                 sb1000_wait_for_ready_clear(ioaddr, name);
1129                 sb1000_send_command(ioaddr, name, Command0);
1130                 sb1000_wait_for_ready(ioaddr, name);
1131                 sb1000_issue_read_command(ioaddr, name);
1132         }
1133         if (lp->rx_error_count >= MaxRxErrorCount) {
1134                 sb1000_wait_for_ready_clear(ioaddr, name);
1135                 sb1000_send_command(ioaddr, name, Command1);
1136                 sb1000_wait_for_ready(ioaddr, name);
1137                 sb1000_issue_read_command(ioaddr, name);
1138                 lp->rx_error_count = 0;
1139         }
1140 
1141         return IRQ_HANDLED;
1142 }
1143 
1144 static int sb1000_close(struct net_device *dev)
1145 {
1146         int i;
1147         int ioaddr[2];
1148         struct sb1000_private *lp = netdev_priv(dev);
1149 
1150         if (sb1000_debug > 2)
1151                 printk(KERN_DEBUG "%s: Shutting down sb1000.\n", dev->name);
1152 
1153         netif_stop_queue(dev);
1154 
1155         ioaddr[0] = dev->base_addr;
1156         /* mem_start holds the second I/O address */
1157         ioaddr[1] = dev->mem_start;
1158 
1159         free_irq(dev->irq, dev);
1160         /* If we don't do this, we can't re-insmod it later. */
1161         release_region(ioaddr[1], SB1000_IO_EXTENT);
1162         release_region(ioaddr[0], SB1000_IO_EXTENT);
1163 
1164         /* free rx_skb's if needed */
1165         for (i=0; i<4; i++) {
1166                 if (lp->rx_skb[i]) {
1167                         dev_kfree_skb(lp->rx_skb[i]);
1168                 }
1169         }
1170         return 0;
1171 }
1172 
1173 MODULE_AUTHOR("Franco Venturi <fventuri@mediaone.net>");
1174 MODULE_DESCRIPTION("General Instruments SB1000 driver");
1175 MODULE_LICENSE("GPL");
1176 
1177 module_pnp_driver(sb1000_driver);
1178 

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