1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * drivers/atm/suni.c - S/UNI PHY driver
4 *
5 * Supports the following:
6 * PMC PM5346 S/UNI LITE
7 * PMC PM5350 S/UNI 155 ULTRA
8 * PMC PM5355 S/UNI 622
9 */
10
11 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
12
13 #include <linux/module.h>
14 #include <linux/jiffies.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/errno.h>
18 #include <linux/atmdev.h>
19 #include <linux/sonet.h>
20 #include <linux/delay.h>
21 #include <linux/timer.h>
22 #include <linux/init.h>
23 #include <linux/capability.h>
24 #include <linux/slab.h>
25 #include <asm/param.h>
26 #include <linux/uaccess.h>
27 #include <linux/atomic.h>
28
29 #include "suni.h"
30
31
32 #if 0
33 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
34 #else
35 #define DPRINTK(format,args...)
36 #endif
37
38 #define PRIV(dev) ((struct suni_priv *) dev->phy_data)
39
40 #define PUT(val,reg) dev->ops->phy_put(dev,val,SUNI_##reg)
41 #define GET(reg) dev->ops->phy_get(dev,SUNI_##reg)
42 #define REG_CHANGE(mask,shift,value,reg) \
43 PUT((GET(reg) & ~(mask)) | ((value) << (shift)),reg)
44
45
46 static struct timer_list poll_timer;
47 static struct suni_priv *sunis = NULL;
48 static DEFINE_SPINLOCK(sunis_lock);
49
50
51 #define ADD_LIMITED(s,v) \
52 atomic_add((v),&stats->s); \
53 if (atomic_read(&stats->s) < 0) atomic_set(&stats->s,INT_MAX);
54
55
suni_hz(struct timer_list * timer)56 static void suni_hz(struct timer_list *timer)
57 {
58 struct suni_priv *walk;
59 struct atm_dev *dev;
60 struct k_sonet_stats *stats;
61
62 for (walk = sunis; walk; walk = walk->next) {
63 dev = walk->dev;
64 stats = &walk->sonet_stats;
65 PUT(0,MRI); /* latch counters */
66 udelay(1);
67 ADD_LIMITED(section_bip,(GET(RSOP_SBL) & 0xff) |
68 ((GET(RSOP_SBM) & 0xff) << 8));
69 ADD_LIMITED(line_bip,(GET(RLOP_LBL) & 0xff) |
70 ((GET(RLOP_LB) & 0xff) << 8) |
71 ((GET(RLOP_LBM) & 0xf) << 16));
72 ADD_LIMITED(path_bip,(GET(RPOP_PBL) & 0xff) |
73 ((GET(RPOP_PBM) & 0xff) << 8));
74 ADD_LIMITED(line_febe,(GET(RLOP_LFL) & 0xff) |
75 ((GET(RLOP_LF) & 0xff) << 8) |
76 ((GET(RLOP_LFM) & 0xf) << 16));
77 ADD_LIMITED(path_febe,(GET(RPOP_PFL) & 0xff) |
78 ((GET(RPOP_PFM) & 0xff) << 8));
79 ADD_LIMITED(corr_hcs,GET(RACP_CHEC) & 0xff);
80 ADD_LIMITED(uncorr_hcs,GET(RACP_UHEC) & 0xff);
81 ADD_LIMITED(rx_cells,(GET(RACP_RCCL) & 0xff) |
82 ((GET(RACP_RCC) & 0xff) << 8) |
83 ((GET(RACP_RCCM) & 7) << 16));
84 ADD_LIMITED(tx_cells,(GET(TACP_TCCL) & 0xff) |
85 ((GET(TACP_TCC) & 0xff) << 8) |
86 ((GET(TACP_TCCM) & 7) << 16));
87 }
88 if (timer) mod_timer(&poll_timer,jiffies+HZ);
89 }
90
91
92 #undef ADD_LIMITED
93
94
fetch_stats(struct atm_dev * dev,struct sonet_stats __user * arg,int zero)95 static int fetch_stats(struct atm_dev *dev,struct sonet_stats __user *arg,int zero)
96 {
97 struct sonet_stats tmp;
98 int error = 0;
99
100 sonet_copy_stats(&PRIV(dev)->sonet_stats,&tmp);
101 if (arg) error = copy_to_user(arg,&tmp,sizeof(tmp));
102 if (zero && !error) sonet_subtract_stats(&PRIV(dev)->sonet_stats,&tmp);
103 return error ? -EFAULT : 0;
104 }
105
106
107 #define HANDLE_FLAG(flag,reg,bit) \
108 if (todo & flag) { \
109 if (set) PUT(GET(reg) | bit,reg); \
110 else PUT(GET(reg) & ~bit,reg); \
111 todo &= ~flag; \
112 }
113
114
change_diag(struct atm_dev * dev,void __user * arg,int set)115 static int change_diag(struct atm_dev *dev,void __user *arg,int set)
116 {
117 int todo;
118
119 if (get_user(todo,(int __user *)arg)) return -EFAULT;
120 HANDLE_FLAG(SONET_INS_SBIP,TSOP_DIAG,SUNI_TSOP_DIAG_DBIP8);
121 HANDLE_FLAG(SONET_INS_LBIP,TLOP_DIAG,SUNI_TLOP_DIAG_DBIP);
122 HANDLE_FLAG(SONET_INS_PBIP,TPOP_CD,SUNI_TPOP_DIAG_DB3);
123 HANDLE_FLAG(SONET_INS_FRAME,RSOP_CIE,SUNI_RSOP_CIE_FOOF);
124 HANDLE_FLAG(SONET_INS_LAIS,TSOP_CTRL,SUNI_TSOP_CTRL_LAIS);
125 HANDLE_FLAG(SONET_INS_PAIS,TPOP_CD,SUNI_TPOP_DIAG_PAIS);
126 HANDLE_FLAG(SONET_INS_LOS,TSOP_DIAG,SUNI_TSOP_DIAG_DLOS);
127 HANDLE_FLAG(SONET_INS_HCS,TACP_CS,SUNI_TACP_CS_DHCS);
128 return put_user(todo,(int __user *)arg) ? -EFAULT : 0;
129 }
130
131
132 #undef HANDLE_FLAG
133
134
get_diag(struct atm_dev * dev,void __user * arg)135 static int get_diag(struct atm_dev *dev,void __user *arg)
136 {
137 int set;
138
139 set = 0;
140 if (GET(TSOP_DIAG) & SUNI_TSOP_DIAG_DBIP8) set |= SONET_INS_SBIP;
141 if (GET(TLOP_DIAG) & SUNI_TLOP_DIAG_DBIP) set |= SONET_INS_LBIP;
142 if (GET(TPOP_CD) & SUNI_TPOP_DIAG_DB3) set |= SONET_INS_PBIP;
143 /* SONET_INS_FRAME is one-shot only */
144 if (GET(TSOP_CTRL) & SUNI_TSOP_CTRL_LAIS) set |= SONET_INS_LAIS;
145 if (GET(TPOP_CD) & SUNI_TPOP_DIAG_PAIS) set |= SONET_INS_PAIS;
146 if (GET(TSOP_DIAG) & SUNI_TSOP_DIAG_DLOS) set |= SONET_INS_LOS;
147 if (GET(TACP_CS) & SUNI_TACP_CS_DHCS) set |= SONET_INS_HCS;
148 return put_user(set,(int __user *)arg) ? -EFAULT : 0;
149 }
150
151
set_loopback(struct atm_dev * dev,int mode)152 static int set_loopback(struct atm_dev *dev,int mode)
153 {
154 unsigned char control;
155 int reg, dle, lle;
156
157 if (PRIV(dev)->type == SUNI_MRI_TYPE_PM5355) {
158 reg = SUNI_MCM;
159 dle = SUNI_MCM_DLE;
160 lle = SUNI_MCM_LLE;
161 } else {
162 reg = SUNI_MCT;
163 dle = SUNI_MCT_DLE;
164 lle = SUNI_MCT_LLE;
165 }
166
167 control = dev->ops->phy_get(dev, reg) & ~(dle | lle);
168 switch (mode) {
169 case ATM_LM_NONE:
170 break;
171 case ATM_LM_LOC_PHY:
172 control |= dle;
173 break;
174 case ATM_LM_RMT_PHY:
175 control |= lle;
176 break;
177 default:
178 return -EINVAL;
179 }
180 dev->ops->phy_put(dev, control, reg);
181 PRIV(dev)->loop_mode = mode;
182 return 0;
183 }
184
185 /*
186 * SONET vs. SDH Configuration
187 *
188 * Z0INS (register 0x06): 0 for SONET, 1 for SDH
189 * ENSS (register 0x3D): 0 for SONET, 1 for SDH
190 * LEN16 (register 0x28): 0 for SONET, 1 for SDH (n/a for S/UNI 155 QUAD)
191 * LEN16 (register 0x50): 0 for SONET, 1 for SDH (n/a for S/UNI 155 QUAD)
192 * S[1:0] (register 0x46): 00 for SONET, 10 for SDH
193 */
194
set_sonet(struct atm_dev * dev)195 static int set_sonet(struct atm_dev *dev)
196 {
197 if (PRIV(dev)->type == SUNI_MRI_TYPE_PM5355) {
198 PUT(GET(RPOP_RC) & ~SUNI_RPOP_RC_ENSS, RPOP_RC);
199 PUT(GET(SSTB_CTRL) & ~SUNI_SSTB_CTRL_LEN16, SSTB_CTRL);
200 PUT(GET(SPTB_CTRL) & ~SUNI_SPTB_CTRL_LEN16, SPTB_CTRL);
201 }
202
203 REG_CHANGE(SUNI_TPOP_APM_S, SUNI_TPOP_APM_S_SHIFT,
204 SUNI_TPOP_S_SONET, TPOP_APM);
205
206 return 0;
207 }
208
set_sdh(struct atm_dev * dev)209 static int set_sdh(struct atm_dev *dev)
210 {
211 if (PRIV(dev)->type == SUNI_MRI_TYPE_PM5355) {
212 PUT(GET(RPOP_RC) | SUNI_RPOP_RC_ENSS, RPOP_RC);
213 PUT(GET(SSTB_CTRL) | SUNI_SSTB_CTRL_LEN16, SSTB_CTRL);
214 PUT(GET(SPTB_CTRL) | SUNI_SPTB_CTRL_LEN16, SPTB_CTRL);
215 }
216
217 REG_CHANGE(SUNI_TPOP_APM_S, SUNI_TPOP_APM_S_SHIFT,
218 SUNI_TPOP_S_SDH, TPOP_APM);
219
220 return 0;
221 }
222
223
get_framing(struct atm_dev * dev,void __user * arg)224 static int get_framing(struct atm_dev *dev, void __user *arg)
225 {
226 int framing;
227 unsigned char s;
228
229
230 s = (GET(TPOP_APM) & SUNI_TPOP_APM_S) >> SUNI_TPOP_APM_S_SHIFT;
231 if (s == SUNI_TPOP_S_SONET)
232 framing = SONET_FRAME_SONET;
233 else
234 framing = SONET_FRAME_SDH;
235
236 return put_user(framing, (int __user *) arg) ? -EFAULT : 0;
237 }
238
set_framing(struct atm_dev * dev,void __user * arg)239 static int set_framing(struct atm_dev *dev, void __user *arg)
240 {
241 int mode;
242
243 if (get_user(mode, (int __user *) arg))
244 return -EFAULT;
245
246 if (mode == SONET_FRAME_SONET)
247 return set_sonet(dev);
248 else if (mode == SONET_FRAME_SDH)
249 return set_sdh(dev);
250
251 return -EINVAL;
252 }
253
254
suni_ioctl(struct atm_dev * dev,unsigned int cmd,void __user * arg)255 static int suni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
256 {
257 switch (cmd) {
258 case SONET_GETSTATZ:
259 case SONET_GETSTAT:
260 return fetch_stats(dev, arg, cmd == SONET_GETSTATZ);
261 case SONET_SETDIAG:
262 return change_diag(dev,arg,1);
263 case SONET_CLRDIAG:
264 return change_diag(dev,arg,0);
265 case SONET_GETDIAG:
266 return get_diag(dev,arg);
267 case SONET_SETFRAMING:
268 if (!capable(CAP_NET_ADMIN))
269 return -EPERM;
270 return set_framing(dev, arg);
271 case SONET_GETFRAMING:
272 return get_framing(dev, arg);
273 case SONET_GETFRSENSE:
274 return -EINVAL;
275 case ATM_SETLOOP:
276 if (!capable(CAP_NET_ADMIN))
277 return -EPERM;
278 return set_loopback(dev,(int)(unsigned long)arg);
279 case ATM_GETLOOP:
280 return put_user(PRIV(dev)->loop_mode,(int __user *)arg) ?
281 -EFAULT : 0;
282 case ATM_QUERYLOOP:
283 return put_user(ATM_LM_LOC_PHY | ATM_LM_RMT_PHY,
284 (int __user *) arg) ? -EFAULT : 0;
285 default:
286 return -ENOIOCTLCMD;
287 }
288 }
289
290
poll_los(struct atm_dev * dev)291 static void poll_los(struct atm_dev *dev)
292 {
293 atm_dev_signal_change(dev,
294 GET(RSOP_SIS) & SUNI_RSOP_SIS_LOSV ?
295 ATM_PHY_SIG_LOST : ATM_PHY_SIG_FOUND);
296 }
297
298
suni_int(struct atm_dev * dev)299 static void suni_int(struct atm_dev *dev)
300 {
301 poll_los(dev);
302 printk(KERN_NOTICE "%s(itf %d): signal %s\n",dev->type,dev->number,
303 dev->signal == ATM_PHY_SIG_LOST ? "lost" : "detected again");
304 }
305
306
suni_start(struct atm_dev * dev)307 static int suni_start(struct atm_dev *dev)
308 {
309 unsigned long flags;
310 int first;
311
312 spin_lock_irqsave(&sunis_lock,flags);
313 first = !sunis;
314 PRIV(dev)->next = sunis;
315 sunis = PRIV(dev);
316 spin_unlock_irqrestore(&sunis_lock,flags);
317 memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats));
318 PUT(GET(RSOP_CIE) | SUNI_RSOP_CIE_LOSE,RSOP_CIE);
319 /* interrupt on loss of signal */
320 poll_los(dev); /* ... and clear SUNI interrupts */
321 if (dev->signal == ATM_PHY_SIG_LOST)
322 printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type,
323 dev->number);
324 PRIV(dev)->loop_mode = ATM_LM_NONE;
325 suni_hz(NULL); /* clear SUNI counters */
326 (void) fetch_stats(dev,NULL,1); /* clear kernel counters */
327 if (first) {
328 timer_setup(&poll_timer, suni_hz, 0);
329 poll_timer.expires = jiffies+HZ;
330 #if 0
331 printk(KERN_DEBUG "[u] p=0x%lx,n=0x%lx\n",(unsigned long) poll_timer.list.prev,
332 (unsigned long) poll_timer.list.next);
333 #endif
334 add_timer(&poll_timer);
335 }
336 return 0;
337 }
338
339
suni_stop(struct atm_dev * dev)340 static int suni_stop(struct atm_dev *dev)
341 {
342 struct suni_priv **walk;
343 unsigned long flags;
344
345 /* let SAR driver worry about stopping interrupts */
346 spin_lock_irqsave(&sunis_lock,flags);
347 for (walk = &sunis; *walk != PRIV(dev);
348 walk = &PRIV((*walk)->dev)->next);
349 *walk = PRIV((*walk)->dev)->next;
350 if (!sunis) del_timer_sync(&poll_timer);
351 spin_unlock_irqrestore(&sunis_lock,flags);
352 kfree(PRIV(dev));
353
354 return 0;
355 }
356
357
358 static const struct atmphy_ops suni_ops = {
359 .start = suni_start,
360 .ioctl = suni_ioctl,
361 .interrupt = suni_int,
362 .stop = suni_stop,
363 };
364
365
suni_init(struct atm_dev * dev)366 int suni_init(struct atm_dev *dev)
367 {
368 unsigned char mri;
369
370 if (!(dev->phy_data = kmalloc(sizeof(struct suni_priv),GFP_KERNEL)))
371 return -ENOMEM;
372 PRIV(dev)->dev = dev;
373
374 mri = GET(MRI); /* reset SUNI */
375 PRIV(dev)->type = (mri & SUNI_MRI_TYPE) >> SUNI_MRI_TYPE_SHIFT;
376 PUT(mri | SUNI_MRI_RESET,MRI);
377 PUT(mri,MRI);
378 PUT((GET(MT) & SUNI_MT_DS27_53),MT); /* disable all tests */
379 set_sonet(dev);
380 REG_CHANGE(SUNI_TACP_IUCHP_CLP,0,SUNI_TACP_IUCHP_CLP,
381 TACP_IUCHP); /* idle cells */
382 PUT(SUNI_IDLE_PATTERN,TACP_IUCPOP);
383 dev->phy = &suni_ops;
384
385 return 0;
386 }
387
388 EXPORT_SYMBOL(suni_init);
389
390 MODULE_LICENSE("GPL");
391