aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/atm/suni.c
blob: 6097f6877a44208ec9a51640373572f024131c61 (plain) (blame)
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
/* drivers/atm/suni.c - PMC PM5346 SUNI (PHY) driver */
 
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */


#include <linux/module.h>
#include <linux/jiffies.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_suni.h>
#include <asm/system.h>
#include <asm/param.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>

#include "suni.h"


#if 0
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif

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

#define PUT(val,reg) dev->ops->phy_put(dev,val,SUNI_##reg)
#define GET(reg) dev->ops->phy_get(dev,SUNI_##reg)
#define REG_CHANGE(mask,shift,value,reg) \
  PUT((GET(reg) & ~(mask)) | ((value) << (shift)),reg)


static struct timer_list poll_timer;
static struct suni_priv *sunis = NULL;
static DEFINE_SPINLOCK(sunis_lock);


#define ADD_LIMITED(s,v) \
    atomic_add((v),&stats->s); \
    if (atomic_read(&stats->s) < 0) atomic_set(&stats->s,INT_MAX);


static void suni_hz(unsigned long from_timer)
{
	struct suni_priv *walk;
	struct atm_dev *dev;
	struct k_sonet_stats *stats;

	for (walk = sunis; walk; walk = walk->next) {
		dev = walk->dev;
		stats = &walk->sonet_stats;
		PUT(0,MRI); /* latch counters */
		udelay(1);
		ADD_LIMITED(section_bip,(GET(RSOP_SBL) & 0xff) |
		    ((GET(RSOP_SBM) & 0xff) << 8));
		ADD_LIMITED(line_bip,(GET(RLOP_LBL) & 0xff) |
		    ((GET(RLOP_LB) & 0xff) << 8) |
		    ((GET(RLOP_LBM) & 0xf) << 16));
		ADD_LIMITED(path_bip,(GET(RPOP_PBL) & 0xff) |
		    ((GET(RPOP_PBM) & 0xff) << 8));
		ADD_LIMITED(line_febe,(GET(RLOP_LFL) & 0xff) |
		    ((GET(RLOP_LF) & 0xff) << 8) |
		    ((GET(RLOP_LFM) & 0xf) << 16));
		ADD_LIMITED(path_febe,(GET(RPOP_PFL) & 0xff) |
		    ((GET(RPOP_PFM) & 0xff) << 8));
		ADD_LIMITED(corr_hcs,GET(RACP_CHEC) & 0xff);
		ADD_LIMITED(uncorr_hcs,GET(RACP_UHEC) & 0xff);
		ADD_LIMITED(rx_cells,(GET(RACP_RCCL) & 0xff) |
		    ((GET(RACP_RCC) & 0xff) << 8) |
		    ((GET(RACP_RCCM) & 7) << 16));
		ADD_LIMITED(tx_cells,(GET(TACP_TCCL) & 0xff) |
		    ((GET(TACP_TCC) & 0xff) << 8) |
		    ((GET(TACP_TCCM) & 7) << 16));
	}
	if (from_timer) mod_timer(&poll_timer,jiffies+HZ);
}


#undef ADD_LIMITED


static int fetch_stats(struct atm_dev *dev,struct sonet_stats __user *arg,int zero)
{
	struct sonet_stats tmp;
	int error = 0;

	sonet_copy_stats(&PRIV(dev)->sonet_stats,&tmp);
	if (arg) error = copy_to_user(arg,&tmp,sizeof(tmp));
	if (zero && !error) sonet_subtract_stats(&PRIV(dev)->sonet_stats,&tmp);
	return error ? -EFAULT : 0;
}


#define HANDLE_FLAG(flag,reg,bit) \
  if (todo & flag) { \
    if (set) PUT(GET(reg) | bit,reg); \
    else PUT(GET(reg) & ~bit,reg); \
    todo &= ~flag; \
  }


static int change_diag(struct atm_dev *dev,void __user *arg,int set)
{
	int todo;

	if (get_user(todo,(int __user *)arg)) return -EFAULT;
	HANDLE_FLAG(SONET_INS_SBIP,TSOP_DIAG,SUNI_TSOP_DIAG_DBIP8);
	HANDLE_FLAG(SONET_INS_LBIP,TLOP_DIAG,SUNI_TLOP_DIAG_DBIP);
	HANDLE_FLAG(SONET_INS_PBIP,TPOP_CD,SUNI_TPOP_DIAG_DB3);
	HANDLE_FLAG(SONET_INS_FRAME,RSOP_CIE,SUNI_RSOP_CIE_FOOF);
	HANDLE_FLAG(SONET_INS_LAIS,TSOP_CTRL,SUNI_TSOP_CTRL_LAIS);
	HANDLE_FLAG(SONET_INS_PAIS,TPOP_CD,SUNI_TPOP_DIAG_PAIS);
	HANDLE_FLAG(SONET_INS_LOS,TSOP_DIAG,SUNI_TSOP_DIAG_DLOS);
	HANDLE_FLAG(SONET_INS_HCS,TACP_CS,SUNI_TACP_CS_DHCS);
	return put_user(todo,(int __user *)arg) ? -EFAULT : 0;
}


#undef HANDLE_FLAG


static int get_diag(struct atm_dev *dev,void __user *arg)
{
	int set;

	set = 0;
	if (GET(TSOP_DIAG) & SUNI_TSOP_DIAG_DBIP8) set |= SONET_INS_SBIP;
	if (GET(TLOP_DIAG) & SUNI_TLOP_DIAG_DBIP) set |= SONET_INS_LBIP;
	if (GET(TPOP_CD) & SUNI_TPOP_DIAG_DB3) set |= SONET_INS_PBIP;
	/* SONET_INS_FRAME is one-shot only */
	if (GET(TSOP_CTRL) & SUNI_TSOP_CTRL_LAIS) set |= SONET_INS_LAIS;
	if (GET(TPOP_CD) & SUNI_TPOP_DIAG_PAIS) set |= SONET_INS_PAIS;
	if (GET(TSOP_DIAG) & SUNI_TSOP_DIAG_DLOS) set |= SONET_INS_LOS;
	if (GET(TACP_CS) & SUNI_TACP_CS_DHCS) set |= SONET_INS_HCS;
	return put_user(set,(int __user *)arg) ? -EFAULT : 0;
}


static int set_loopback(struct atm_dev *dev,int mode)
{
	unsigned char control;

	control = GET(MCT) & ~(SUNI_MCT_DLE | SUNI_MCT_LLE);
	switch (mode) {
		case ATM_LM_NONE:
			break;
		case ATM_LM_LOC_PHY:
			control |= SUNI_MCT_DLE;
			break;
		case ATM_LM_RMT_PHY:
			control |= SUNI_MCT_LLE;
			break;
		default:
			return -EINVAL;
	}
	PUT(control,MCT);
	PRIV(dev)->loop_mode = mode;
	return 0;
}


static int suni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
{
	switch (cmd) {
		case SONET_GETSTATZ:
		case SONET_GETSTAT:
			return fetch_stats(dev, arg, cmd == SONET_GETSTATZ);
		case SONET_SETDIAG:
			return change_diag(dev,arg,1);
		case SONET_CLRDIAG:
			return change_diag(dev,arg,0);
		case SONET_GETDIAG:
			return get_diag(dev,arg);
		case SONET_SETFRAMING:
			if ((int)(unsigned long)arg != SONET_FRAME_SONET) return -EINVAL;
			return 0;
		case SONET_GETFRAMING:
			return put_user(SONET_FRAME_SONET,(int __user *)arg) ?
			    -EFAULT : 0;
		case SONET_GETFRSENSE:
			return -EINVAL;
		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_PHY | ATM_LM_RMT_PHY,
			    (int __user *) arg) ? -EFAULT : 0;
		default:
			return -ENOIOCTLCMD;
	}
}


static void poll_los(struct atm_dev *dev)
{
	dev->signal = GET(RSOP_SIS) & SUNI_RSOP_SIS_LOSV ? ATM_PHY_SIG_LOST :
	  ATM_PHY_SIG_FOUND;
}


static void suni_int(struct atm_dev *dev)
{
	poll_los(dev);
	printk(KERN_NOTICE "%s(itf %d): signal %s\n",dev->type,dev->number,
	    dev->signal == ATM_PHY_SIG_LOST ?  "lost" : "detected again");
}


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

	if (!(dev->phy_data = kmalloc(sizeof(struct suni_priv),GFP_KERNEL)))
		return -ENOMEM;

	PRIV(dev)->dev = dev;
	spin_lock_irqsave(&sunis_lock,flags);
	first = !sunis;
	PRIV(dev)->next = sunis;
	sunis = PRIV(dev);
	spin_unlock_irqrestore(&sunis_lock,flags);
	memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats));
	PUT(GET(RSOP_CIE) | SUNI_RSOP_CIE_LOSE,RSOP_CIE);
		/* interrupt on loss of signal */
	poll_los(dev); /* ... and clear SUNI interrupts */
	if (dev->signal == ATM_PHY_SIG_LOST)
		printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type,
		    dev->number);
	PRIV(dev)->loop_mode = ATM_LM_NONE;
	suni_hz(0); /* clear SUNI counters */
	(void) fetch_stats(dev,NULL,1); /* clear kernel counters */
	if (first) {
		init_timer(&poll_timer);
		poll_timer.expires = jiffies+HZ;
		poll_timer.function = suni_hz;
		poll_timer.data = 1;
#if 0
printk(KERN_DEBUG "[u] p=0x%lx,n=0x%lx\n",(unsigned long) poll_timer.list.prev,
    (unsigned long) poll_timer.list.next);
#endif
		add_timer(&poll_timer);
	}
	return 0;
}


static int suni_stop(struct atm_dev *dev)
{
	struct suni_priv **walk;
	unsigned long flags;

	/* let SAR driver worry about stopping interrupts */
	spin_lock_irqsave(&sunis_lock,flags);
	for (walk = &sunis; *walk != PRIV(dev);
	    walk = &PRIV((*walk)->dev)->next);
	*walk = PRIV((*walk)->dev)->next;
	if (!sunis) del_timer_sync(&poll_timer);
	spin_unlock_irqrestore(&sunis_lock,flags);
	kfree(PRIV(dev));

	return 0;
}


static const struct atmphy_ops suni_ops = {
	.start		= suni_start,
	.ioctl		= suni_ioctl,
	.interrupt	= suni_int,
	.stop		= suni_stop,
};


int suni_init(struct atm_dev *dev)
{
	unsigned char mri;

	mri = GET(MRI); /* reset SUNI */
	PUT(mri | SUNI_MRI_RESET,MRI);
	PUT(mri,MRI);
	PUT((GET(MT) & SUNI_MT_DS27_53),MT); /* disable all tests */
	REG_CHANGE(SUNI_TPOP_APM_S,SUNI_TPOP_APM_S_SHIFT,SUNI_TPOP_S_SONET,
	    TPOP_APM); /* use SONET */
	REG_CHANGE(SUNI_TACP_IUCHP_CLP,0,SUNI_TACP_IUCHP_CLP,
	    TACP_IUCHP); /* idle cells */
	PUT(SUNI_IDLE_PATTERN,TACP_IUCPOP);
	dev->phy = &suni_ops;
	return 0;
}

EXPORT_SYMBOL(suni_init);

MODULE_LICENSE("GPL");