drivers/atm/suni.c

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