drivers/atm/suni.c

   1 /*
   2  * drivers/atm/suni.c - S/UNI PHY driver
   3  *
   4  * Supports the following:
   5  *      PMC PM5346 S/UNI LITE
   6  *      PMC PM5350 S/UNI 155 ULTRA
   7  *      PMC PM5355 S/UNI 622
   8  */
   9
  10 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
  11
  12 #include <linux/module.h>
  13 #include <linux/jiffies.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mm.h>
  16 #include <linux/errno.h>
  17 #include <linux/atmdev.h>
  18 #include <linux/sonet.h>
  19 #include <linux/delay.h>
  20 #include <linux/timer.h>
  21 #include <linux/init.h>
  22 #include <linux/capability.h>
  23 #include <linux/atm_suni.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
  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
  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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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
 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");