aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/atm/idt77105.c
blob: d781b3f87693855b0b8d07634ab07d11f868669b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
/* drivers/atm/idt77105.c - IDT77105 (PHY) driver */
 
/* Written 1999 by Greg Banks, NEC Australia <gnb@linuxfan.com>. Based on suni.c */


#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/atm_idt77105.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <asm/param.h>
#include <linux/uaccess.h>

#include "idt77105.h"

#undef GENERAL_DEBUG

#ifdef GENERAL_DEBUG
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif


struct idt77105_priv {
	struct idt77105_stats stats;    /* link diagnostics */
	struct atm_dev *dev;		/* device back-pointer */
	struct idt77105_priv *next;
        int loop_mode;
        unsigned char old_mcr;          /* storage of MCR reg while signal lost */
};

static DEFINE_SPINLOCK(idt77105_priv_lock);

#define PRIV(dev) ((struct idt77105_priv *) dev->phy_data)

#define PUT(val,reg) dev->ops->phy_put(dev,val,IDT77105_##reg)
#define GET(reg) dev->ops->phy_get(dev,IDT77105_##reg)

static void idt77105_stats_timer_func(unsigned long);
static void idt77105_restart_timer_func(unsigned long);


static DEFINE_TIMER(stats_timer, idt77105_stats_timer_func, 0, 0);
static DEFINE_TIMER(restart_timer, idt77105_restart_timer_func, 0, 0);
static int start_timer = 1;
static struct idt77105_priv *idt77105_all = NULL;

/*
 * Retrieve the value of one of the IDT77105's counters.
 * `counter' is one of the IDT77105_CTRSEL_* constants.
 */
static u16 get_counter(struct atm_dev *dev, int counter)
{
        u16 val;
        
        /* write the counter bit into PHY register 6 */
        PUT(counter, CTRSEL);
        /* read the low 8 bits from register 4 */
        val = GET(CTRLO);
        /* read the high 8 bits from register 5 */
        val |= GET(CTRHI)<<8;
        
        return val;
}

/*
 * Timer function called every second to gather statistics
 * from the 77105. This is done because the h/w registers
 * will overflow if not read at least once per second. The
 * kernel's stats are much higher precision. Also, having
 * a separate copy of the stats allows implementation of
 * an ioctl which gathers the stats *without* zero'ing them.
 */
static void idt77105_stats_timer_func(unsigned long dummy)
{
	struct idt77105_priv *walk;
	struct atm_dev *dev;
	struct idt77105_stats *stats;

        DPRINTK("IDT77105 gathering statistics\n");
	for (walk = idt77105_all; walk; walk = walk->next) {
		dev = walk->dev;
                
		stats = &walk->stats;
                stats->symbol_errors += get_counter(dev, IDT77105_CTRSEL_SEC);
                stats->tx_cells += get_counter(dev, IDT77105_CTRSEL_TCC);
                stats->rx_cells += get_counter(dev, IDT77105_CTRSEL_RCC);
                stats->rx_hec_errors += get_counter(dev, IDT77105_CTRSEL_RHEC);
	}
        if (!start_timer) mod_timer(&stats_timer,jiffies+IDT77105_STATS_TIMER_PERIOD);
}


/*
 * A separate timer func which handles restarting PHY chips which
 * have had the cable re-inserted after being pulled out. This is
 * done by polling the Good Signal Bit in the Interrupt Status
 * register every 5 seconds. The other technique (checking Good
 * Signal Bit in the interrupt handler) cannot be used because PHY
 * interrupts need to be disabled when the cable is pulled out
 * to avoid lots of spurious cell error interrupts.
 */
static void idt77105_restart_timer_func(unsigned long dummy)
{
	struct idt77105_priv *walk;
	struct atm_dev *dev;
        unsigned char istat;

        DPRINTK("IDT77105 checking for cable re-insertion\n");
	for (walk = idt77105_all; walk; walk = walk->next) {
		dev = walk->dev;
                
                if (dev->signal != ATM_PHY_SIG_LOST)
                    continue;
                    
                istat = GET(ISTAT); /* side effect: clears all interrupt status bits */
                if (istat & IDT77105_ISTAT_GOODSIG) {
                    /* Found signal again */
                    atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND);
	            printk(KERN_NOTICE "%s(itf %d): signal detected again\n",
                        dev->type,dev->number);
                    /* flush the receive FIFO */
                    PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG);
                    /* re-enable interrupts */
	            PUT( walk->old_mcr ,MCR);
                }
	}
        if (!start_timer) mod_timer(&restart_timer,jiffies+IDT77105_RESTART_TIMER_PERIOD);
}


static int fetch_stats(struct atm_dev *dev,struct idt77105_stats __user *arg,int zero)
{
	unsigned long flags;
	struct idt77105_stats stats;

	spin_lock_irqsave(&idt77105_priv_lock, flags);
	memcpy(&stats, &PRIV(dev)->stats, sizeof(struct idt77105_stats));
	if (zero)
		memset(&PRIV(dev)->stats, 0, sizeof(struct idt77105_stats));
	spin_unlock_irqrestore(&idt77105_priv_lock, flags);
	if (arg == NULL)
		return 0;
	return copy_to_user(arg, &stats,
		    sizeof(struct idt77105_stats)) ? -EFAULT : 0;
}


static int set_loopback(struct atm_dev *dev,int mode)
{
	int diag;

	diag = GET(DIAG) & ~IDT77105_DIAG_LCMASK;
	switch (mode) {
		case ATM_LM_NONE:
			break;
		case ATM_LM_LOC_ATM:
			diag |= IDT77105_DIAG_LC_PHY_LOOPBACK;
			break;
		case ATM_LM_RMT_ATM:
			diag |= IDT77105_DIAG_LC_LINE_LOOPBACK;
			break;
		default:
			return -EINVAL;
	}
	PUT(diag,DIAG);
	printk(KERN_NOTICE "%s(%d) Loopback mode is: %s\n", dev->type,
	    dev->number,
	    (mode == ATM_LM_NONE ? "NONE" : 
	      (mode == ATM_LM_LOC_ATM ? "DIAG (local)" :
		(mode == IDT77105_DIAG_LC_LINE_LOOPBACK ? "LOOP (remote)" :
		  "unknown")))
		    );
	PRIV(dev)->loop_mode = mode;
	return 0;
}


static int idt77105_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
{
        printk(KERN_NOTICE "%s(%d) idt77105_ioctl() called\n",dev->type,dev->number);
	switch (cmd) {
		case IDT77105_GETSTATZ:
			if (!capable(CAP_NET_ADMIN)) return -EPERM;
			/* fall through */
		case IDT77105_GETSTAT:
			return fetch_stats(dev, arg, cmd == IDT77105_GETSTATZ);
		case ATM_SETLOOP:
			return set_loopback(dev,(int)(unsigned long) arg);
		case ATM_GETLOOP:
			return put_user(PRIV(dev)->loop_mode,(int __user *)arg) ?
			    -EFAULT : 0;
		case ATM_QUERYLOOP:
			return put_user(ATM_LM_LOC_ATM | ATM_LM_RMT_ATM,
			    (int __user *) arg) ? -EFAULT : 0;
		default:
			return -ENOIOCTLCMD;
	}
}



static void idt77105_int(struct atm_dev *dev)
{
        unsigned char istat;
        
        istat = GET(ISTAT); /* side effect: clears all interrupt status bits */
     
        DPRINTK("IDT77105 generated an interrupt, istat=%02x\n", (unsigned)istat);
                
        if (istat & IDT77105_ISTAT_RSCC) {
            /* Rx Signal Condition Change - line went up or down */
            if (istat & IDT77105_ISTAT_GOODSIG) {   /* signal detected again */
                /* This should not happen (restart timer does it) but JIC */
		atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND);
            } else {    /* signal lost */
                /*
                 * Disable interrupts and stop all transmission and
                 * reception - the restart timer will restore these.
                 */
                PRIV(dev)->old_mcr = GET(MCR);
	        PUT(
                    (PRIV(dev)->old_mcr|
                    IDT77105_MCR_DREC|
                    IDT77105_MCR_DRIC|
                    IDT77105_MCR_HALTTX
                    ) & ~IDT77105_MCR_EIP, MCR);
		atm_dev_signal_change(dev, ATM_PHY_SIG_LOST);
	        printk(KERN_NOTICE "%s(itf %d): signal lost\n",
                    dev->type,dev->number);
            }
        }
        
        if (istat & IDT77105_ISTAT_RFO) {
            /* Rx FIFO Overrun -- perform a FIFO flush */
            PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG);
	    printk(KERN_NOTICE "%s(itf %d): receive FIFO overrun\n",
                dev->type,dev->number);
        }
#ifdef GENERAL_DEBUG
        if (istat & (IDT77105_ISTAT_HECERR | IDT77105_ISTAT_SCR |
                     IDT77105_ISTAT_RSE)) {
            /* normally don't care - just report in stats */
	    printk(KERN_NOTICE "%s(itf %d): received cell with error\n",
                dev->type,dev->number);
        }
#endif
}


static int idt77105_start(struct atm_dev *dev)
{
	unsigned long flags;

	if (!(dev->dev_data = kmalloc(sizeof(struct idt77105_priv),GFP_KERNEL)))
		return -ENOMEM;
	PRIV(dev)->dev = dev;
	spin_lock_irqsave(&idt77105_priv_lock, flags);
	PRIV(dev)->next = idt77105_all;
	idt77105_all = PRIV(dev);
	spin_unlock_irqrestore(&idt77105_priv_lock, flags);
	memset(&PRIV(dev)->stats,0,sizeof(struct idt77105_stats));
        
        /* initialise dev->signal from Good Signal Bit */
	atm_dev_signal_change(dev,
		GET(ISTAT) & IDT77105_ISTAT_GOODSIG ?
		ATM_PHY_SIG_FOUND : ATM_PHY_SIG_LOST);
	if (dev->signal == ATM_PHY_SIG_LOST)
		printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type,
		    dev->number);

        /* initialise loop mode from hardware */
        switch ( GET(DIAG) & IDT77105_DIAG_LCMASK ) {
        case IDT77105_DIAG_LC_NORMAL:
            PRIV(dev)->loop_mode = ATM_LM_NONE;
            break;
        case IDT77105_DIAG_LC_PHY_LOOPBACK:
            PRIV(dev)->loop_mode = ATM_LM_LOC_ATM;
            break;
        case IDT77105_DIAG_LC_LINE_LOOPBACK:
            PRIV(dev)->loop_mode = ATM_LM_RMT_ATM;
            break;
        }
        
        /* enable interrupts, e.g. on loss of signal */
        PRIV(dev)->old_mcr = GET(MCR);
        if (dev->signal == ATM_PHY_SIG_FOUND) {
            PRIV(dev)->old_mcr |= IDT77105_MCR_EIP;
	    PUT(PRIV(dev)->old_mcr, MCR);
        }

                    
	idt77105_stats_timer_func(0); /* clear 77105 counters */
	(void) fetch_stats(dev,NULL,1); /* clear kernel counters */
        
	spin_lock_irqsave(&idt77105_priv_lock, flags);
	if (start_timer) {
		start_timer = 0;
                
		stats_timer.expires = jiffies+IDT77105_STATS_TIMER_PERIOD;
		add_timer(&stats_timer);
                
		restart_timer.expires = jiffies+IDT77105_RESTART_TIMER_PERIOD;
		add_timer(&restart_timer);
	}
	spin_unlock_irqrestore(&idt77105_priv_lock, flags);
	return 0;
}


static int idt77105_stop(struct atm_dev *dev)
{
	struct idt77105_priv *walk, *prev;

        DPRINTK("%s(itf %d): stopping IDT77105\n",dev->type,dev->number);
        
        /* disable interrupts */
	PUT( GET(MCR) & ~IDT77105_MCR_EIP, MCR );
        
        /* detach private struct from atm_dev & free */
	for (prev = NULL, walk = idt77105_all ;
             walk != NULL;
             prev = walk, walk = walk->next) {
            if (walk->dev == dev) {
                if (prev != NULL)
                    prev->next = walk->next;
                else
                    idt77105_all = walk->next;
	        dev->phy = NULL;
                dev->dev_data = NULL;
                kfree(walk);
                break;
            }
        }

	return 0;
}


static const struct atmphy_ops idt77105_ops = {
	.start = 	idt77105_start,
	.ioctl =	idt77105_ioctl,
	.interrupt =	idt77105_int,
	.stop =		idt77105_stop,
};


int idt77105_init(struct atm_dev *dev)
{
	dev->phy = &idt77105_ops;
	return 0;
}

EXPORT_SYMBOL(idt77105_init);

static void __exit idt77105_exit(void)
{
	/* turn off timers */
	del_timer_sync(&stats_timer);
	del_timer_sync(&restart_timer);
}

module_exit(idt77105_exit);

MODULE_LICENSE("GPL");

Privacy Policy