Root/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
35static 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/string.h>
40#include <linux/interrupt.h>
41#include <linux/errno.h>
42#include <linux/if_cablemodem.h> /* for SIOGCM/SIOSCM stuff */
43#include <linux/in.h>
44#include <linux/slab.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
55#include <asm/io.h>
56#include <asm/processor.h>
57#include <asm/uaccess.h>
58
59#ifdef SB1000_DEBUG
60static int sb1000_debug = SB1000_DEBUG;
61#else
62static const int sb1000_debug = 1;
63#endif
64
65static const int SB1000_IO_EXTENT = 8;
66/* SB1000 Maximum Receive Unit */
67static const int SB1000_MRU = 1500; /* octects */
68
69#define NPIDS 4
70struct sb1000_private {
71    struct sk_buff *rx_skb[NPIDS];
72    short rx_dlen[NPIDS];
73    unsigned int rx_frames;
74    short rx_error_count;
75    short rx_error_dpc_count;
76    unsigned char rx_session_id[NPIDS];
77    unsigned char rx_frame_id[NPIDS];
78    unsigned char rx_pkt_type[NPIDS];
79};
80
81/* prototypes for Linux interface */
82extern int sb1000_probe(struct net_device *dev);
83static int sb1000_open(struct net_device *dev);
84static int sb1000_dev_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd);
85static int sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev);
86static irqreturn_t sb1000_interrupt(int irq, void *dev_id);
87static int sb1000_close(struct net_device *dev);
88
89
90/* SB1000 hardware routines to be used during open/configuration phases */
91static int card_wait_for_busy_clear(const int ioaddr[],
92    const char* name);
93static int card_wait_for_ready(const int ioaddr[], const char* name,
94    unsigned char in[]);
95static int card_send_command(const int ioaddr[], const char* name,
96    const unsigned char out[], unsigned char in[]);
97
98/* SB1000 hardware routines to be used during frame rx interrupt */
99static int sb1000_wait_for_ready(const int ioaddr[], const char* name);
100static int sb1000_wait_for_ready_clear(const int ioaddr[],
101    const char* name);
102static void sb1000_send_command(const int ioaddr[], const char* name,
103    const unsigned char out[]);
104static void sb1000_read_status(const int ioaddr[], unsigned char in[]);
105static void sb1000_issue_read_command(const int ioaddr[],
106    const char* name);
107
108/* SB1000 commands for open/configuration */
109static int sb1000_reset(const int ioaddr[], const char* name);
110static int sb1000_check_CRC(const int ioaddr[], const char* name);
111static inline int sb1000_start_get_set_command(const int ioaddr[],
112    const char* name);
113static int sb1000_end_get_set_command(const int ioaddr[],
114    const char* name);
115static int sb1000_activate(const int ioaddr[], const char* name);
116static int sb1000_get_firmware_version(const int ioaddr[],
117    const char* name, unsigned char version[], int do_end);
118static int sb1000_get_frequency(const int ioaddr[], const char* name,
119    int* frequency);
120static int sb1000_set_frequency(const int ioaddr[], const char* name,
121    int frequency);
122static int sb1000_get_PIDs(const int ioaddr[], const char* name,
123    short PID[]);
124static int sb1000_set_PIDs(const int ioaddr[], const char* name,
125    const short PID[]);
126
127/* SB1000 commands for frame rx interrupt */
128static int sb1000_rx(struct net_device *dev);
129static void sb1000_error_dpc(struct net_device *dev);
130
131static const struct pnp_device_id sb1000_pnp_ids[] = {
132    { "GIC1000", 0 },
133    { "", 0 }
134};
135MODULE_DEVICE_TABLE(pnp, sb1000_pnp_ids);
136
137static const struct net_device_ops sb1000_netdev_ops = {
138    .ndo_open = sb1000_open,
139    .ndo_start_xmit = sb1000_start_xmit,
140    .ndo_do_ioctl = sb1000_dev_ioctl,
141    .ndo_stop = sb1000_close,
142    .ndo_change_mtu = eth_change_mtu,
143    .ndo_set_mac_address = eth_mac_addr,
144    .ndo_validate_addr = eth_validate_addr,
145};
146
147static int
148sb1000_probe_one(struct pnp_dev *pdev, const struct pnp_device_id *id)
149{
150    struct net_device *dev;
151    unsigned short ioaddr[2], irq;
152    unsigned int serial_number;
153    int error = -ENODEV;
154
155    if (pnp_device_attach(pdev) < 0)
156        return -ENODEV;
157    if (pnp_activate_dev(pdev) < 0)
158        goto out_detach;
159
160    if (!pnp_port_valid(pdev, 0) || !pnp_port_valid(pdev, 1))
161        goto out_disable;
162    if (!pnp_irq_valid(pdev, 0))
163        goto out_disable;
164
165    serial_number = pdev->card->serial;
166
167    ioaddr[0] = pnp_port_start(pdev, 0);
168    ioaddr[1] = pnp_port_start(pdev, 0);
169
170    irq = pnp_irq(pdev, 0);
171
172    if (!request_region(ioaddr[0], 16, "sb1000"))
173        goto out_disable;
174    if (!request_region(ioaddr[1], 16, "sb1000"))
175        goto out_release_region0;
176
177    dev = alloc_etherdev(sizeof(struct sb1000_private));
178    if (!dev) {
179        error = -ENOMEM;
180        goto out_release_regions;
181    }
182
183
184    dev->base_addr = ioaddr[0];
185    /* mem_start holds the second I/O address */
186    dev->mem_start = ioaddr[1];
187    dev->irq = irq;
188
189    if (sb1000_debug > 0)
190        printk(KERN_NOTICE "%s: sb1000 at (%#3.3lx,%#3.3lx), "
191            "S/N %#8.8x, IRQ %d.\n", dev->name, dev->base_addr,
192            dev->mem_start, serial_number, dev->irq);
193
194    /*
195     * The SB1000 is an rx-only cable modem device. The uplink is a modem
196     * and we do not want to arp on it.
197     */
198    dev->flags = IFF_POINTOPOINT|IFF_NOARP;
199
200    SET_NETDEV_DEV(dev, &pdev->dev);
201
202    if (sb1000_debug > 0)
203        printk(KERN_NOTICE "%s", version);
204
205    dev->netdev_ops = &sb1000_netdev_ops;
206
207    /* hardware address is 0:0:serial_number */
208    dev->dev_addr[2] = serial_number >> 24 & 0xff;
209    dev->dev_addr[3] = serial_number >> 16 & 0xff;
210    dev->dev_addr[4] = serial_number >> 8 & 0xff;
211    dev->dev_addr[5] = serial_number >> 0 & 0xff;
212
213    pnp_set_drvdata(pdev, dev);
214
215    error = register_netdev(dev);
216    if (error)
217        goto out_free_netdev;
218    return 0;
219
220 out_free_netdev:
221    free_netdev(dev);
222 out_release_regions:
223    release_region(ioaddr[1], 16);
224 out_release_region0:
225    release_region(ioaddr[0], 16);
226 out_disable:
227    pnp_disable_dev(pdev);
228 out_detach:
229    pnp_device_detach(pdev);
230    return error;
231}
232
233static void
234sb1000_remove_one(struct pnp_dev *pdev)
235{
236    struct net_device *dev = pnp_get_drvdata(pdev);
237
238    unregister_netdev(dev);
239    release_region(dev->base_addr, 16);
240    release_region(dev->mem_start, 16);
241    free_netdev(dev);
242}
243
244static struct pnp_driver sb1000_driver = {
245    .name = "sb1000",
246    .id_table = sb1000_pnp_ids,
247    .probe = sb1000_probe_one,
248    .remove = sb1000_remove_one,
249};
250
251
252/*
253 * SB1000 hardware routines to be used during open/configuration phases
254 */
255
256static const int TimeOutJiffies = (875 * HZ) / 100;
257
258/* Card Wait For Busy Clear (cannot be used during an interrupt) */
259static int
260card_wait_for_busy_clear(const int ioaddr[], const char* name)
261{
262    unsigned char a;
263    unsigned long timeout;
264
265    a = inb(ioaddr[0] + 7);
266    timeout = jiffies + TimeOutJiffies;
267    while (a & 0x80 || a & 0x40) {
268        /* a little sleep */
269        yield();
270
271        a = inb(ioaddr[0] + 7);
272        if (time_after_eq(jiffies, timeout)) {
273            printk(KERN_WARNING "%s: card_wait_for_busy_clear timeout\n",
274                name);
275            return -ETIME;
276        }
277    }
278
279    return 0;
280}
281
282/* Card Wait For Ready (cannot be used during an interrupt) */
283static int
284card_wait_for_ready(const int ioaddr[], const char* name, unsigned char in[])
285{
286    unsigned char a;
287    unsigned long timeout;
288
289    a = inb(ioaddr[1] + 6);
290    timeout = jiffies + TimeOutJiffies;
291    while (a & 0x80 || !(a & 0x40)) {
292        /* a little sleep */
293        yield();
294
295        a = inb(ioaddr[1] + 6);
296        if (time_after_eq(jiffies, timeout)) {
297            printk(KERN_WARNING "%s: card_wait_for_ready timeout\n",
298                name);
299            return -ETIME;
300        }
301    }
302
303    in[1] = inb(ioaddr[0] + 1);
304    in[2] = inb(ioaddr[0] + 2);
305    in[3] = inb(ioaddr[0] + 3);
306    in[4] = inb(ioaddr[0] + 4);
307    in[0] = inb(ioaddr[0] + 5);
308    in[6] = inb(ioaddr[0] + 6);
309    in[5] = inb(ioaddr[1] + 6);
310    return 0;
311}
312
313/* Card Send Command (cannot be used during an interrupt) */
314static int
315card_send_command(const int ioaddr[], const char* name,
316    const unsigned char out[], unsigned char in[])
317{
318    int status, x;
319
320    if ((status = card_wait_for_busy_clear(ioaddr, name)))
321        return status;
322    outb(0xa0, ioaddr[0] + 6);
323    outb(out[2], ioaddr[0] + 1);
324    outb(out[3], ioaddr[0] + 2);
325    outb(out[4], ioaddr[0] + 3);
326    outb(out[5], ioaddr[0] + 4);
327    outb(out[1], ioaddr[0] + 5);
328    outb(0xa0, ioaddr[0] + 6);
329    outb(out[0], ioaddr[0] + 7);
330    if (out[0] != 0x20 && out[0] != 0x30) {
331        if ((status = card_wait_for_ready(ioaddr, name, in)))
332            return status;
333        inb(ioaddr[0] + 7);
334        if (sb1000_debug > 3)
335            printk(KERN_DEBUG "%s: card_send_command "
336                "out: %02x%02x%02x%02x%02x%02x "
337                "in: %02x%02x%02x%02x%02x%02x%02x\n", name,
338                out[0], out[1], out[2], out[3], out[4], out[5],
339                in[0], in[1], in[2], in[3], in[4], in[5], in[6]);
340    } else {
341        if (sb1000_debug > 3)
342            printk(KERN_DEBUG "%s: card_send_command "
343                "out: %02x%02x%02x%02x%02x%02x\n", name,
344                out[0], out[1], out[2], out[3], out[4], out[5]);
345    }
346
347    if (out[1] == 0x1b) {
348        x = (out[2] == 0x02);
349    } else {
350        if (out[0] >= 0x80 && in[0] != (out[1] | 0x80))
351            return -EIO;
352    }
353    return 0;
354}
355
356
357/*
358 * SB1000 hardware routines to be used during frame rx interrupt
359 */
360static const int Sb1000TimeOutJiffies = 7 * HZ;
361
362/* Card Wait For Ready (to be used during frame rx) */
363static int
364sb1000_wait_for_ready(const int ioaddr[], const char* name)
365{
366    unsigned long timeout;
367
368    timeout = jiffies + Sb1000TimeOutJiffies;
369    while (inb(ioaddr[1] + 6) & 0x80) {
370        if (time_after_eq(jiffies, timeout)) {
371            printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
372                name);
373            return -ETIME;
374        }
375    }
376    timeout = jiffies + Sb1000TimeOutJiffies;
377    while (!(inb(ioaddr[1] + 6) & 0x40)) {
378        if (time_after_eq(jiffies, timeout)) {
379            printk(KERN_WARNING "%s: sb1000_wait_for_ready timeout\n",
380                name);
381            return -ETIME;
382        }
383    }
384    inb(ioaddr[0] + 7);
385    return 0;
386}
387
388/* Card Wait For Ready Clear (to be used during frame rx) */
389static int
390sb1000_wait_for_ready_clear(const int ioaddr[], const char* name)
391{
392    unsigned long timeout;
393
394    timeout = jiffies + Sb1000TimeOutJiffies;
395    while (inb(ioaddr[1] + 6) & 0x80) {
396        if (time_after_eq(jiffies, timeout)) {
397            printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
398                name);
399            return -ETIME;
400        }
401    }
402    timeout = jiffies + Sb1000TimeOutJiffies;
403    while (inb(ioaddr[1] + 6) & 0x40) {
404        if (time_after_eq(jiffies, timeout)) {
405            printk(KERN_WARNING "%s: sb1000_wait_for_ready_clear timeout\n",
406                name);
407            return -ETIME;
408        }
409    }
410    return 0;
411}
412
413/* Card Send Command (to be used during frame rx) */
414static void
415sb1000_send_command(const int ioaddr[], const char* name,
416    const unsigned char out[])
417{
418    outb(out[2], ioaddr[0] + 1);
419    outb(out[3], ioaddr[0] + 2);
420    outb(out[4], ioaddr[0] + 3);
421    outb(out[5], ioaddr[0] + 4);
422    outb(out[1], ioaddr[0] + 5);
423    outb(out[0], ioaddr[0] + 7);
424    if (sb1000_debug > 3)
425        printk(KERN_DEBUG "%s: sb1000_send_command out: %02x%02x%02x%02x"
426            "%02x%02x\n", name, out[0], out[1], out[2], out[3], out[4], out[5]);
427    return;
428}
429
430/* Card Read Status (to be used during frame rx) */
431static void
432sb1000_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    return;
440}
441
442/* Issue Read Command (to be used during frame rx) */
443static void
444sb1000_issue_read_command(const int ioaddr[], const char* name)
445{
446    static const unsigned char Command0[6] = {0x20, 0x00, 0x00, 0x01, 0x00, 0x00};
447
448    sb1000_wait_for_ready_clear(ioaddr, name);
449    outb(0xa0, ioaddr[0] + 6);
450    sb1000_send_command(ioaddr, name, Command0);
451    return;
452}
453
454
455/*
456 * SB1000 commands for open/configuration
457 */
458/* reset SB1000 card */
459static int
460sb1000_reset(const int ioaddr[], const char* name)
461{
462    static const unsigned char Command0[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
463
464    unsigned char st[7];
465    int port, status;
466
467    port = ioaddr[1] + 6;
468    outb(0x4, port);
469    inb(port);
470    udelay(1000);
471    outb(0x0, port);
472    inb(port);
473    ssleep(1);
474    outb(0x4, port);
475    inb(port);
476    udelay(1000);
477    outb(0x0, port);
478    inb(port);
479    udelay(0);
480
481    if ((status = card_send_command(ioaddr, name, Command0, st)))
482        return status;
483    if (st[3] != 0xf0)
484        return -EIO;
485    return 0;
486}
487
488/* check SB1000 firmware CRC */
489static int
490sb1000_check_CRC(const int ioaddr[], const char* name)
491{
492    static const unsigned char Command0[6] = {0x80, 0x1f, 0x00, 0x00, 0x00, 0x00};
493
494    unsigned char st[7];
495    int crc, status;
496
497    /* check CRC */
498    if ((status = card_send_command(ioaddr, name, Command0, st)))
499        return status;
500    if (st[1] != st[3] || st[2] != st[4])
501        return -EIO;
502    crc = st[1] << 8 | st[2];
503    return 0;
504}
505
506static inline int
507sb1000_start_get_set_command(const int ioaddr[], const char* name)
508{
509    static const unsigned char Command0[6] = {0x80, 0x1b, 0x00, 0x00, 0x00, 0x00};
510
511    unsigned char st[7];
512
513    return card_send_command(ioaddr, name, Command0, st);
514}
515
516static int
517sb1000_end_get_set_command(const int ioaddr[], const char* name)
518{
519    static const unsigned char Command0[6] = {0x80, 0x1b, 0x02, 0x00, 0x00, 0x00};
520    static const unsigned char Command1[6] = {0x20, 0x00, 0x00, 0x00, 0x00, 0x00};
521
522    unsigned char st[7];
523    int status;
524
525    if ((status = card_send_command(ioaddr, name, Command0, st)))
526        return status;
527    return card_send_command(ioaddr, name, Command1, st);
528}
529
530static int
531sb1000_activate(const int ioaddr[], const char* name)
532{
533    static const unsigned char Command0[6] = {0x80, 0x11, 0x00, 0x00, 0x00, 0x00};
534    static const unsigned char Command1[6] = {0x80, 0x16, 0x00, 0x00, 0x00, 0x00};
535
536    unsigned char st[7];
537    int status;
538
539    ssleep(1);
540    if ((status = card_send_command(ioaddr, name, Command0, st)))
541        return status;
542    if ((status = card_send_command(ioaddr, name, Command1, st)))
543        return status;
544    if (st[3] != 0xf1) {
545        if ((status = sb1000_start_get_set_command(ioaddr, name)))
546            return status;
547        return -EIO;
548    }
549    udelay(1000);
550    return sb1000_start_get_set_command(ioaddr, name);
551}
552
553/* get SB1000 firmware version */
554static int
555sb1000_get_firmware_version(const int ioaddr[], const char* name,
556    unsigned char version[], int do_end)
557{
558    static const unsigned char Command0[6] = {0x80, 0x23, 0x00, 0x00, 0x00, 0x00};
559
560    unsigned char st[7];
561    int status;
562
563    if ((status = sb1000_start_get_set_command(ioaddr, name)))
564        return status;
565    if ((status = card_send_command(ioaddr, name, Command0, st)))
566        return status;
567    if (st[0] != 0xa3)
568        return -EIO;
569    version[0] = st[1];
570    version[1] = st[2];
571    if (do_end)
572        return sb1000_end_get_set_command(ioaddr, name);
573    else
574        return 0;
575}
576
577/* get SB1000 frequency */
578static int
579sb1000_get_frequency(const int ioaddr[], const char* name, int* frequency)
580{
581    static const unsigned char Command0[6] = {0x80, 0x44, 0x00, 0x00, 0x00, 0x00};
582
583    unsigned char st[7];
584    int status;
585
586    udelay(1000);
587    if ((status = sb1000_start_get_set_command(ioaddr, name)))
588        return status;
589    if ((status = card_send_command(ioaddr, name, Command0, st)))
590        return status;
591    *frequency = ((st[1] << 8 | st[2]) << 8 | st[3]) << 8 | st[4];
592    return sb1000_end_get_set_command(ioaddr, name);
593}
594
595/* set SB1000 frequency */
596static int
597sb1000_set_frequency(const int ioaddr[], const char* name, int frequency)
598{
599    unsigned char st[7];
600    int status;
601    unsigned char Command0[6] = {0x80, 0x29, 0x00, 0x00, 0x00, 0x00};
602
603    const int FrequencyLowerLimit = 57000;
604    const int FrequencyUpperLimit = 804000;
605
606    if (frequency < FrequencyLowerLimit || frequency > FrequencyUpperLimit) {
607        printk(KERN_ERR "%s: frequency chosen (%d kHz) is not in the range "
608            "[%d,%d] kHz\n", name, frequency, FrequencyLowerLimit,
609            FrequencyUpperLimit);
610        return -EINVAL;
611    }
612    udelay(1000);
613    if ((status = sb1000_start_get_set_command(ioaddr, name)))
614        return status;
615    Command0[5] = frequency & 0xff;
616    frequency >>= 8;
617    Command0[4] = frequency & 0xff;
618    frequency >>= 8;
619    Command0[3] = frequency & 0xff;
620    frequency >>= 8;
621    Command0[2] = frequency & 0xff;
622    return card_send_command(ioaddr, name, Command0, st);
623}
624
625/* get SB1000 PIDs */
626static int
627sb1000_get_PIDs(const int ioaddr[], const char* name, short PID[])
628{
629    static const unsigned char Command0[6] = {0x80, 0x40, 0x00, 0x00, 0x00, 0x00};
630    static const unsigned char Command1[6] = {0x80, 0x41, 0x00, 0x00, 0x00, 0x00};
631    static const unsigned char Command2[6] = {0x80, 0x42, 0x00, 0x00, 0x00, 0x00};
632    static const unsigned char Command3[6] = {0x80, 0x43, 0x00, 0x00, 0x00, 0x00};
633
634    unsigned char st[7];
635    int status;
636
637    udelay(1000);
638    if ((status = sb1000_start_get_set_command(ioaddr, name)))
639        return status;
640
641    if ((status = card_send_command(ioaddr, name, Command0, st)))
642        return status;
643    PID[0] = st[1] << 8 | st[2];
644
645    if ((status = card_send_command(ioaddr, name, Command1, st)))
646        return status;
647    PID[1] = st[1] << 8 | st[2];
648
649    if ((status = card_send_command(ioaddr, name, Command2, st)))
650        return status;
651    PID[2] = st[1] << 8 | st[2];
652
653    if ((status = card_send_command(ioaddr, name, Command3, st)))
654        return status;
655    PID[3] = st[1] << 8 | st[2];
656
657    return sb1000_end_get_set_command(ioaddr, name);
658}
659
660/* set SB1000 PIDs */
661static int
662sb1000_set_PIDs(const int ioaddr[], const char* name, const short PID[])
663{
664    static const unsigned char Command4[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
665
666    unsigned char st[7];
667    short p;
668    int status;
669    unsigned char Command0[6] = {0x80, 0x31, 0x00, 0x00, 0x00, 0x00};
670    unsigned char Command1[6] = {0x80, 0x32, 0x00, 0x00, 0x00, 0x00};
671    unsigned char Command2[6] = {0x80, 0x33, 0x00, 0x00, 0x00, 0x00};
672    unsigned char Command3[6] = {0x80, 0x34, 0x00, 0x00, 0x00, 0x00};
673
674    udelay(1000);
675    if ((status = sb1000_start_get_set_command(ioaddr, name)))
676        return status;
677
678    p = PID[0];
679    Command0[3] = p & 0xff;
680    p >>= 8;
681    Command0[2] = p & 0xff;
682    if ((status = card_send_command(ioaddr, name, Command0, st)))
683        return status;
684
685    p = PID[1];
686    Command1[3] = p & 0xff;
687    p >>= 8;
688    Command1[2] = p & 0xff;
689    if ((status = card_send_command(ioaddr, name, Command1, st)))
690        return status;
691
692    p = PID[2];
693    Command2[3] = p & 0xff;
694    p >>= 8;
695    Command2[2] = p & 0xff;
696    if ((status = card_send_command(ioaddr, name, Command2, st)))
697        return status;
698
699    p = PID[3];
700    Command3[3] = p & 0xff;
701    p >>= 8;
702    Command3[2] = p & 0xff;
703    if ((status = card_send_command(ioaddr, name, Command3, st)))
704        return status;
705
706    if ((status = card_send_command(ioaddr, name, Command4, st)))
707        return status;
708    return sb1000_end_get_set_command(ioaddr, name);
709}
710
711
712static void
713sb1000_print_status_buffer(const char* name, unsigned char st[],
714    unsigned char buffer[], int size)
715{
716    int i, j, k;
717
718    printk(KERN_DEBUG "%s: status: %02x %02x\n", name, st[0], st[1]);
719    if (buffer[24] == 0x08 && buffer[25] == 0x00 && buffer[26] == 0x45) {
720        printk(KERN_DEBUG "%s: length: %d protocol: %d from: %d.%d.%d.%d:%d "
721            "to %d.%d.%d.%d:%d\n", name, buffer[28] << 8 | buffer[29],
722            buffer[35], buffer[38], buffer[39], buffer[40], buffer[41],
723            buffer[46] << 8 | buffer[47],
724            buffer[42], buffer[43], buffer[44], buffer[45],
725            buffer[48] << 8 | buffer[49]);
726    } else {
727        for (i = 0, k = 0; i < (size + 7) / 8; i++) {
728            printk(KERN_DEBUG "%s: %s", name, i ? " " : "buffer:");
729            for (j = 0; j < 8 && k < size; j++, k++)
730                printk(" %02x", buffer[k]);
731            printk("\n");
732        }
733    }
734    return;
735}
736
737/*
738 * SB1000 commands for frame rx interrupt
739 */
740/* receive a single frame and assemble datagram
741 * (this is the heart of the interrupt routine)
742 */
743static int
744sb1000_rx(struct net_device *dev)
745{
746
747#define FRAMESIZE 184
748    unsigned char st[2], buffer[FRAMESIZE], session_id, frame_id;
749    short dlen;
750    int ioaddr, ns;
751    unsigned int skbsize;
752    struct sk_buff *skb;
753    struct sb1000_private *lp = netdev_priv(dev);
754    struct net_device_stats *stats = &dev->stats;
755
756    /* SB1000 frame constants */
757    const int FrameSize = FRAMESIZE;
758    const int NewDatagramHeaderSkip = 8;
759    const int NewDatagramHeaderSize = NewDatagramHeaderSkip + 18;
760    const int NewDatagramDataSize = FrameSize - NewDatagramHeaderSize;
761    const int ContDatagramHeaderSkip = 7;
762    const int ContDatagramHeaderSize = ContDatagramHeaderSkip + 1;
763    const int ContDatagramDataSize = FrameSize - ContDatagramHeaderSize;
764    const int TrailerSize = 4;
765
766    ioaddr = dev->base_addr;
767
768    insw(ioaddr, (unsigned short*) st, 1);
769#ifdef XXXDEBUG
770printk("cm0: received: %02x %02x\n", st[0], st[1]);
771#endif /* XXXDEBUG */
772    lp->rx_frames++;
773
774    /* decide if it is a good or bad frame */
775    for (ns = 0; ns < NPIDS; ns++) {
776        session_id = lp->rx_session_id[ns];
777        frame_id = lp->rx_frame_id[ns];
778        if (st[0] == session_id) {
779            if (st[1] == frame_id || (!frame_id && (st[1] & 0xf0) == 0x30)) {
780                goto good_frame;
781            } else if ((st[1] & 0xf0) == 0x30 && (st[0] & 0x40)) {
782                goto skipped_frame;
783            } else {
784                goto bad_frame;
785            }
786        } else if (st[0] == (session_id | 0x40)) {
787            if ((st[1] & 0xf0) == 0x30) {
788                goto skipped_frame;
789            } else {
790                goto bad_frame;
791            }
792        }
793    }
794    goto bad_frame;
795
796skipped_frame:
797    stats->rx_frame_errors++;
798    skb = lp->rx_skb[ns];
799    if (sb1000_debug > 1)
800        printk(KERN_WARNING "%s: missing frame(s): got %02x %02x "
801            "expecting %02x %02x\n", dev->name, st[0], st[1],
802            skb ? session_id : session_id | 0x40, frame_id);
803    if (skb) {
804        dev_kfree_skb(skb);
805        skb = NULL;
806    }
807
808good_frame:
809    lp->rx_frame_id[ns] = 0x30 | ((st[1] + 1) & 0x0f);
810    /* new datagram */
811    if (st[0] & 0x40) {
812        /* get data length */
813        insw(ioaddr, buffer, NewDatagramHeaderSize / 2);
814#ifdef XXXDEBUG
815printk("cm0: IP identification: %02x%02x fragment offset: %02x%02x\n", buffer[30], buffer[31], buffer[32], buffer[33]);
816#endif /* XXXDEBUG */
817        if (buffer[0] != NewDatagramHeaderSkip) {
818            if (sb1000_debug > 1)
819                printk(KERN_WARNING "%s: new datagram header skip error: "
820                    "got %02x expecting %02x\n", dev->name, buffer[0],
821                    NewDatagramHeaderSkip);
822            stats->rx_length_errors++;
823            insw(ioaddr, buffer, NewDatagramDataSize / 2);
824            goto bad_frame_next;
825        }
826        dlen = ((buffer[NewDatagramHeaderSkip + 3] & 0x0f) << 8 |
827            buffer[NewDatagramHeaderSkip + 4]) - 17;
828        if (dlen > SB1000_MRU) {
829            if (sb1000_debug > 1)
830                printk(KERN_WARNING "%s: datagram length (%d) greater "
831                    "than MRU (%d)\n", dev->name, dlen, SB1000_MRU);
832            stats->rx_length_errors++;
833            insw(ioaddr, buffer, NewDatagramDataSize / 2);
834            goto bad_frame_next;
835        }
836        lp->rx_dlen[ns] = dlen;
837        /* compute size to allocate for datagram */
838        skbsize = dlen + FrameSize;
839        if ((skb = alloc_skb(skbsize, GFP_ATOMIC)) == NULL) {
840            if (sb1000_debug > 1)
841                printk(KERN_WARNING "%s: can't allocate %d bytes long "
842                    "skbuff\n", dev->name, skbsize);
843            stats->rx_dropped++;
844            insw(ioaddr, buffer, NewDatagramDataSize / 2);
845            goto dropped_frame;
846        }
847        skb->dev = dev;
848        skb_reset_mac_header(skb);
849        skb->protocol = (unsigned short) buffer[NewDatagramHeaderSkip + 16];
850        insw(ioaddr, skb_put(skb, NewDatagramDataSize),
851            NewDatagramDataSize / 2);
852        lp->rx_skb[ns] = skb;
853    } else {
854        /* continuation of previous datagram */
855        insw(ioaddr, buffer, ContDatagramHeaderSize / 2);
856        if (buffer[0] != ContDatagramHeaderSkip) {
857            if (sb1000_debug > 1)
858                printk(KERN_WARNING "%s: cont datagram header skip error: "
859                    "got %02x expecting %02x\n", dev->name, buffer[0],
860                    ContDatagramHeaderSkip);
861            stats->rx_length_errors++;
862            insw(ioaddr, buffer, ContDatagramDataSize / 2);
863            goto bad_frame_next;
864        }
865        skb = lp->rx_skb[ns];
866        insw(ioaddr, skb_put(skb, ContDatagramDataSize),
867            ContDatagramDataSize / 2);
868        dlen = lp->rx_dlen[ns];
869    }
870    if (skb->len < dlen + TrailerSize) {
871        lp->rx_session_id[ns] &= ~0x40;
872        return 0;
873    }
874
875    /* datagram completed: send to upper level */
876    skb_trim(skb, dlen);
877    netif_rx(skb);
878    stats->rx_bytes+=dlen;
879    stats->rx_packets++;
880    lp->rx_skb[ns] = NULL;
881    lp->rx_session_id[ns] |= 0x40;
882    return 0;
883
884bad_frame:
885    insw(ioaddr, buffer, FrameSize / 2);
886    if (sb1000_debug > 1)
887        printk(KERN_WARNING "%s: frame error: got %02x %02x\n",
888            dev->name, st[0], st[1]);
889    stats->rx_frame_errors++;
890bad_frame_next:
891    if (sb1000_debug > 2)
892        sb1000_print_status_buffer(dev->name, st, buffer, FrameSize);
893dropped_frame:
894    stats->rx_errors++;
895    if (ns < NPIDS) {
896        if ((skb = lp->rx_skb[ns])) {
897            dev_kfree_skb(skb);
898            lp->rx_skb[ns] = NULL;
899        }
900        lp->rx_session_id[ns] |= 0x40;
901    }
902    return -1;
903}
904
905static void
906sb1000_error_dpc(struct net_device *dev)
907{
908    static const unsigned char Command0[6] = {0x80, 0x26, 0x00, 0x00, 0x00, 0x00};
909
910    char *name;
911    unsigned char st[5];
912    int ioaddr[2];
913    struct sb1000_private *lp = netdev_priv(dev);
914    const int ErrorDpcCounterInitialize = 200;
915
916    ioaddr[0] = dev->base_addr;
917    /* mem_start holds the second I/O address */
918    ioaddr[1] = dev->mem_start;
919    name = dev->name;
920
921    sb1000_wait_for_ready_clear(ioaddr, name);
922    sb1000_send_command(ioaddr, name, Command0);
923    sb1000_wait_for_ready(ioaddr, name);
924    sb1000_read_status(ioaddr, st);
925    if (st[1] & 0x10)
926        lp->rx_error_dpc_count = ErrorDpcCounterInitialize;
927    return;
928}
929
930
931/*
932 * Linux interface functions
933 */
934static int
935sb1000_open(struct net_device *dev)
936{
937    char *name;
938    int ioaddr[2], status;
939    struct sb1000_private *lp = netdev_priv(dev);
940    const unsigned short FirmwareVersion[] = {0x01, 0x01};
941
942    ioaddr[0] = dev->base_addr;
943    /* mem_start holds the second I/O address */
944    ioaddr[1] = dev->mem_start;
945    name = dev->name;
946
947    /* initialize sb1000 */
948    if ((status = sb1000_reset(ioaddr, name)))
949        return status;
950    ssleep(1);
951    if ((status = sb1000_check_CRC(ioaddr, name)))
952        return status;
953
954    /* initialize private data before board can catch interrupts */
955    lp->rx_skb[0] = NULL;
956    lp->rx_skb[1] = NULL;
957    lp->rx_skb[2] = NULL;
958    lp->rx_skb[3] = NULL;
959    lp->rx_dlen[0] = 0;
960    lp->rx_dlen[1] = 0;
961    lp->rx_dlen[2] = 0;
962    lp->rx_dlen[3] = 0;
963    lp->rx_frames = 0;
964    lp->rx_error_count = 0;
965    lp->rx_error_dpc_count = 0;
966    lp->rx_session_id[0] = 0x50;
967    lp->rx_session_id[0] = 0x48;
968    lp->rx_session_id[0] = 0x44;
969    lp->rx_session_id[0] = 0x42;
970    lp->rx_frame_id[0] = 0;
971    lp->rx_frame_id[1] = 0;
972    lp->rx_frame_id[2] = 0;
973    lp->rx_frame_id[3] = 0;
974    if (request_irq(dev->irq, &sb1000_interrupt, 0, "sb1000", dev)) {
975        return -EAGAIN;
976    }
977
978    if (sb1000_debug > 2)
979        printk(KERN_DEBUG "%s: Opening, IRQ %d\n", name, dev->irq);
980
981    /* Activate board and check firmware version */
982    udelay(1000);
983    if ((status = sb1000_activate(ioaddr, name)))
984        return status;
985    udelay(0);
986    if ((status = sb1000_get_firmware_version(ioaddr, name, version, 0)))
987        return status;
988    if (version[0] != FirmwareVersion[0] || version[1] != FirmwareVersion[1])
989        printk(KERN_WARNING "%s: found firmware version %x.%02x "
990            "(should be %x.%02x)\n", name, version[0], version[1],
991            FirmwareVersion[0], FirmwareVersion[1]);
992
993
994    netif_start_queue(dev);
995    return 0; /* Always succeed */
996}
997
998static int sb1000_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
999{
1000    char* name;
1001    unsigned char version[2];
1002    short PID[4];
1003    int ioaddr[2], status, frequency;
1004    unsigned int stats[5];
1005    struct sb1000_private *lp = netdev_priv(dev);
1006
1007    if (!(dev && dev->flags & IFF_UP))
1008        return -ENODEV;
1009
1010    ioaddr[0] = dev->base_addr;
1011    /* mem_start holds the second I/O address */
1012    ioaddr[1] = dev->mem_start;
1013    name = dev->name;
1014
1015    switch (cmd) {
1016    case SIOCGCMSTATS: /* get statistics */
1017        stats[0] = dev->stats.rx_bytes;
1018        stats[1] = lp->rx_frames;
1019        stats[2] = dev->stats.rx_packets;
1020        stats[3] = dev->stats.rx_errors;
1021        stats[4] = dev->stats.rx_dropped;
1022        if(copy_to_user(ifr->ifr_data, stats, sizeof(stats)))
1023            return -EFAULT;
1024        status = 0;
1025        break;
1026
1027    case SIOCGCMFIRMWARE: /* get firmware version */
1028        if ((status = sb1000_get_firmware_version(ioaddr, name, version, 1)))
1029            return status;
1030        if(copy_to_user(ifr->ifr_data, version, sizeof(version)))
1031            return -EFAULT;
1032        break;
1033
1034    case SIOCGCMFREQUENCY: /* get frequency */
1035        if ((status = sb1000_get_frequency(ioaddr, name, &frequency)))
1036            return status;
1037        if(put_user(frequency, (int __user *) ifr->ifr_data))
1038            return -EFAULT;
1039        break;
1040
1041    case SIOCSCMFREQUENCY: /* set frequency */
1042        if (!capable(CAP_NET_ADMIN))
1043            return -EPERM;
1044        if(get_user(frequency, (int __user *) ifr->ifr_data))
1045            return -EFAULT;
1046        if ((status = sb1000_set_frequency(ioaddr, name, frequency)))
1047            return status;
1048        break;
1049
1050    case SIOCGCMPIDS: /* get PIDs */
1051        if ((status = sb1000_get_PIDs(ioaddr, name, PID)))
1052            return status;
1053        if(copy_to_user(ifr->ifr_data, PID, sizeof(PID)))
1054            return -EFAULT;
1055        break;
1056
1057    case SIOCSCMPIDS: /* set PIDs */
1058        if (!capable(CAP_NET_ADMIN))
1059            return -EPERM;
1060        if(copy_from_user(PID, ifr->ifr_data, sizeof(PID)))
1061            return -EFAULT;
1062        if ((status = sb1000_set_PIDs(ioaddr, name, PID)))
1063            return status;
1064        /* set session_id, frame_id and pkt_type too */
1065        lp->rx_session_id[0] = 0x50 | (PID[0] & 0x0f);
1066        lp->rx_session_id[1] = 0x48;
1067        lp->rx_session_id[2] = 0x44;
1068        lp->rx_session_id[3] = 0x42;
1069        lp->rx_frame_id[0] = 0;
1070        lp->rx_frame_id[1] = 0;
1071        lp->rx_frame_id[2] = 0;
1072        lp->rx_frame_id[3] = 0;
1073        break;
1074
1075    default:
1076        status = -EINVAL;
1077        break;
1078    }
1079    return status;
1080}
1081
1082/* transmit function: do nothing since SB1000 can't send anything out */
1083static int
1084sb1000_start_xmit(struct sk_buff *skb, struct net_device *dev)
1085{
1086    printk(KERN_WARNING "%s: trying to transmit!!!\n", dev->name);
1087    /* sb1000 can't xmit datagrams */
1088    dev_kfree_skb(skb);
1089    return 0;
1090}
1091
1092/* SB1000 interrupt handler. */
1093static irqreturn_t sb1000_interrupt(int irq, void *dev_id)
1094{
1095    static const unsigned char Command0[6] = {0x80, 0x2c, 0x00, 0x00, 0x00, 0x00};
1096    static const unsigned char Command1[6] = {0x80, 0x2e, 0x00, 0x00, 0x00, 0x00};
1097
1098    char *name;
1099    unsigned char st;
1100    int ioaddr[2];
1101    struct net_device *dev = dev_id;
1102    struct sb1000_private *lp = netdev_priv(dev);
1103
1104    const int MaxRxErrorCount = 6;
1105
1106    ioaddr[0] = dev->base_addr;
1107    /* mem_start holds the second I/O address */
1108    ioaddr[1] = dev->mem_start;
1109    name = dev->name;
1110
1111    /* is it a good interrupt? */
1112    st = inb(ioaddr[1] + 6);
1113    if (!(st & 0x08 && st & 0x20)) {
1114        return IRQ_NONE;
1115    }
1116
1117    if (sb1000_debug > 3)
1118        printk(KERN_DEBUG "%s: entering interrupt\n", dev->name);
1119
1120    st = inb(ioaddr[0] + 7);
1121    if (sb1000_rx(dev))
1122        lp->rx_error_count++;
1123#ifdef SB1000_DELAY
1124    udelay(SB1000_DELAY);
1125#endif /* SB1000_DELAY */
1126    sb1000_issue_read_command(ioaddr, name);
1127    if (st & 0x01) {
1128        sb1000_error_dpc(dev);
1129        sb1000_issue_read_command(ioaddr, name);
1130    }
1131    if (lp->rx_error_dpc_count && !(--lp->rx_error_dpc_count)) {
1132        sb1000_wait_for_ready_clear(ioaddr, name);
1133        sb1000_send_command(ioaddr, name, Command0);
1134        sb1000_wait_for_ready(ioaddr, name);
1135        sb1000_issue_read_command(ioaddr, name);
1136    }
1137    if (lp->rx_error_count >= MaxRxErrorCount) {
1138        sb1000_wait_for_ready_clear(ioaddr, name);
1139        sb1000_send_command(ioaddr, name, Command1);
1140        sb1000_wait_for_ready(ioaddr, name);
1141        sb1000_issue_read_command(ioaddr, name);
1142        lp->rx_error_count = 0;
1143    }
1144
1145    return IRQ_HANDLED;
1146}
1147
1148static int sb1000_close(struct net_device *dev)
1149{
1150    int i;
1151    int ioaddr[2];
1152    struct sb1000_private *lp = netdev_priv(dev);
1153
1154    if (sb1000_debug > 2)
1155        printk(KERN_DEBUG "%s: Shutting down sb1000.\n", dev->name);
1156
1157    netif_stop_queue(dev);
1158
1159    ioaddr[0] = dev->base_addr;
1160    /* mem_start holds the second I/O address */
1161    ioaddr[1] = dev->mem_start;
1162
1163    free_irq(dev->irq, dev);
1164    /* If we don't do this, we can't re-insmod it later. */
1165    release_region(ioaddr[1], SB1000_IO_EXTENT);
1166    release_region(ioaddr[0], SB1000_IO_EXTENT);
1167
1168    /* free rx_skb's if needed */
1169    for (i=0; i<4; i++) {
1170        if (lp->rx_skb[i]) {
1171            dev_kfree_skb(lp->rx_skb[i]);
1172        }
1173    }
1174    return 0;
1175}
1176
1177MODULE_AUTHOR("Franco Venturi <fventuri@mediaone.net>");
1178MODULE_DESCRIPTION("General Instruments SB1000 driver");
1179MODULE_LICENSE("GPL");
1180
1181static int __init
1182sb1000_init(void)
1183{
1184    return pnp_register_driver(&sb1000_driver);
1185}
1186
1187static void __exit
1188sb1000_exit(void)
1189{
1190    pnp_unregister_driver(&sb1000_driver);
1191}
1192
1193module_init(sb1000_init);
1194module_exit(sb1000_exit);
1195

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