drivers/atm/uPD98402.c

   1 /* drivers/atm/uPD98402.c - NEC uPD98402 (PHY) declarations */
   2
   3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   4
   5
   6 #include <linux/module.h>
   7 #include <linux/mm.h>
   8 #include <linux/errno.h>
   9 #include <linux/atmdev.h>
  10 #include <linux/sonet.h>
  11 #include <linux/init.h>
  12 #include <asm/uaccess.h>
  13 #include <asm/atomic.h>
  14
  15 #include "uPD98402.h"
  16
  17
  18 #if 0
  19 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  20 #else
  21 #define DPRINTK(format,args...)
  22 #endif
  23
  24
  25 struct uPD98402_priv {
  26         struct k_sonet_stats sonet_stats;/* link diagnostics */
  27         unsigned char framing;          /* SONET/SDH framing */
  28         int loop_mode;                  /* loopback mode */
  29         spinlock_t lock;
  30 };
  31
  32
  33 #define PRIV(dev) ((struct uPD98402_priv *) dev->phy_data)
  34
  35 #define PUT(val,reg) dev->ops->phy_put(dev,val,uPD98402_##reg)
  36 #define GET(reg) dev->ops->phy_get(dev,uPD98402_##reg)
  37
  38
  39 static int fetch_stats(struct atm_dev *dev,struct sonet_stats __user *arg,int zero)
  40 {
  41         struct sonet_stats tmp;
  42         int error = 0;
  43
  44         atomic_add(GET(HECCT),&PRIV(dev)->sonet_stats.uncorr_hcs);
  45         sonet_copy_stats(&PRIV(dev)->sonet_stats,&tmp);
  46         if (arg) error = copy_to_user(arg,&tmp,sizeof(tmp));
  47         if (zero && !error) {
  48                 /* unused fields are reported as -1, but we must not "adjust"
  49                    them */
  50                 tmp.corr_hcs = tmp.tx_cells = tmp.rx_cells = 0;
  51                 sonet_subtract_stats(&PRIV(dev)->sonet_stats,&tmp);
  52         }
  53         return error ? -EFAULT : 0;
  54 }
  55
  56
  57 static int set_framing(struct atm_dev *dev,unsigned char framing)
  58 {
  59         static const unsigned char sonet[] = { 1,2,3,0 };
  60         static const unsigned char sdh[] = { 1,0,0,2 };
  61         const char *set;
  62         unsigned long flags;
  63
  64         switch (framing) {
  65                 case SONET_FRAME_SONET:
  66                         set = sonet;
  67                         break;
  68                 case SONET_FRAME_SDH:
  69                         set = sdh;
  70                         break;
  71                 default:
  72                         return -EINVAL;
  73         }
  74         spin_lock_irqsave(&PRIV(dev)->lock, flags);
  75         PUT(set[0],C11T);
  76         PUT(set[1],C12T);
  77         PUT(set[2],C13T);
  78         PUT((GET(MDR) & ~uPD98402_MDR_SS_MASK) | (set[3] <<
  79             uPD98402_MDR_SS_SHIFT),MDR);
  80         spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
  81         return 0;
  82 }
  83
  84
  85 static int get_sense(struct atm_dev *dev,u8 __user *arg)
  86 {
  87         unsigned long flags;
  88         unsigned char s[3];
  89
  90         spin_lock_irqsave(&PRIV(dev)->lock, flags);
  91         s[0] = GET(C11R);
  92         s[1] = GET(C12R);
  93         s[2] = GET(C13R);
  94         spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
  95         return (put_user(s[0], arg) || put_user(s[1], arg+1) ||
  96             put_user(s[2], arg+2) || put_user(0xff, arg+3) ||
  97             put_user(0xff, arg+4) || put_user(0xff, arg+5)) ? -EFAULT : 0;
  98 }
  99
 100
 101 static int set_loopback(struct atm_dev *dev,int mode)
 102 {
 103         unsigned char mode_reg;
 104
 105         mode_reg = GET(MDR) & ~(uPD98402_MDR_TPLP | uPD98402_MDR_ALP |
 106             uPD98402_MDR_RPLP);
 107         switch (__ATM_LM_XTLOC(mode)) {
 108                 case __ATM_LM_NONE:
 109                         break;
 110                 case __ATM_LM_PHY:
 111                         mode_reg |= uPD98402_MDR_TPLP;
 112                         break;
 113                 case __ATM_LM_ATM:
 114                         mode_reg |= uPD98402_MDR_ALP;
 115                         break;
 116                 default:
 117                         return -EINVAL;
 118         }
 119         switch (__ATM_LM_XTRMT(mode)) {
 120                 case __ATM_LM_NONE:
 121                         break;
 122                 case __ATM_LM_PHY:
 123                         mode_reg |= uPD98402_MDR_RPLP;
 124                         break;
 125                 default:
 126                         return -EINVAL;
 127         }
 128         PUT(mode_reg,MDR);
 129         PRIV(dev)->loop_mode = mode;
 130         return 0;
 131 }
 132
 133
 134 static int uPD98402_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
 135 {
 136         switch (cmd) {
 137
 138                 case SONET_GETSTATZ:
 139                 case SONET_GETSTAT:
 140                         return fetch_stats(dev,arg, cmd == SONET_GETSTATZ);
 141                 case SONET_SETFRAMING:
 142                         return set_framing(dev, (int)(unsigned long)arg);
 143                 case SONET_GETFRAMING:
 144                         return put_user(PRIV(dev)->framing,(int __user *)arg) ?
 145                             -EFAULT : 0;
 146                 case SONET_GETFRSENSE:
 147                         return get_sense(dev,arg);
 148                 case ATM_SETLOOP:
 149                         return set_loopback(dev, (int)(unsigned long)arg);
 150                 case ATM_GETLOOP:
 151                         return put_user(PRIV(dev)->loop_mode,(int __user *)arg) ?
 152                             -EFAULT : 0;
 153                 case ATM_QUERYLOOP:
 154                         return put_user(ATM_LM_LOC_PHY | ATM_LM_LOC_ATM |
 155                             ATM_LM_RMT_PHY,(int __user *)arg) ? -EFAULT : 0;
 156                 default:
 157                         return -ENOIOCTLCMD;
 158         }
 159 }
 160
 161
 162 #define ADD_LIMITED(s,v) \
 163     { atomic_add(GET(v),&PRIV(dev)->sonet_stats.s); \
 164     if (atomic_read(&PRIV(dev)->sonet_stats.s) < 0) \
 165         atomic_set(&PRIV(dev)->sonet_stats.s,INT_MAX); }
 166
 167
 168 static void stat_event(struct atm_dev *dev)
 169 {
 170         unsigned char events;
 171
 172         events = GET(PCR);
 173         if (events & uPD98402_PFM_PFEB) ADD_LIMITED(path_febe,PFECB);
 174         if (events & uPD98402_PFM_LFEB) ADD_LIMITED(line_febe,LECCT);
 175         if (events & uPD98402_PFM_B3E) ADD_LIMITED(path_bip,B3ECT);
 176         if (events & uPD98402_PFM_B2E) ADD_LIMITED(line_bip,B2ECT);
 177         if (events & uPD98402_PFM_B1E) ADD_LIMITED(section_bip,B1ECT);
 178 }
 179
 180
 181 #undef ADD_LIMITED
 182
 183
 184 static void uPD98402_int(struct atm_dev *dev)
 185 {
 186         static unsigned long silence = 0;
 187         unsigned char reason;
 188
 189         while ((reason = GET(PICR))) {
 190                 if (reason & uPD98402_INT_LOS)
 191                         printk(KERN_NOTICE "%s(itf %d): signal lost\n",
 192                             dev->type,dev->number);
 193                 if (reason & uPD98402_INT_PFM) stat_event(dev);
 194                 if (reason & uPD98402_INT_PCO) {
 195                         (void) GET(PCOCR); /* clear interrupt cause */
 196                         atomic_add(GET(HECCT),
 197                             &PRIV(dev)->sonet_stats.uncorr_hcs);
 198                 }
 199                 if ((reason & uPD98402_INT_RFO) &&
 200                     (time_after(jiffies, silence) || silence == 0)) {
 201                         printk(KERN_WARNING "%s(itf %d): uPD98402 receive "
 202                             "FIFO overflow\n",dev->type,dev->number);
 203                         silence = (jiffies+HZ/2)|1;
 204                 }
 205         }
 206 }
 207
 208
 209 static int uPD98402_start(struct atm_dev *dev)
 210 {
 211         DPRINTK("phy_start\n");
 212         if (!(dev->dev_data = kmalloc(sizeof(struct uPD98402_priv),GFP_KERNEL)))
 213                 return -ENOMEM;
 214         spin_lock_init(&PRIV(dev)->lock);
 215         memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats));
 216         (void) GET(PCR); /* clear performance events */
 217         PUT(uPD98402_PFM_FJ,PCMR); /* ignore frequency adj */
 218         (void) GET(PCOCR); /* clear overflows */
 219         PUT(~uPD98402_PCO_HECC,PCOMR);
 220         (void) GET(PICR); /* clear interrupts */
 221         PUT(~(uPD98402_INT_PFM | uPD98402_INT_ALM | uPD98402_INT_RFO |
 222           uPD98402_INT_LOS),PIMR); /* enable them */
 223         (void) fetch_stats(dev,NULL,1); /* clear kernel counters */
 224         atomic_set(&PRIV(dev)->sonet_stats.corr_hcs,-1);
 225         atomic_set(&PRIV(dev)->sonet_stats.tx_cells,-1);
 226         atomic_set(&PRIV(dev)->sonet_stats.rx_cells,-1);
 227         return 0;
 228 }
 229
 230
 231 static int uPD98402_stop(struct atm_dev *dev)
 232 {
 233         /* let SAR driver worry about stopping interrupts */
 234         kfree(PRIV(dev));
 235         return 0;
 236 }
 237
 238
 239 static const struct atmphy_ops uPD98402_ops = {
 240         .start          = uPD98402_start,
 241         .ioctl          = uPD98402_ioctl,
 242         .interrupt      = uPD98402_int,
 243         .stop           = uPD98402_stop,
 244 };
 245
 246
 247 int uPD98402_init(struct atm_dev *dev)
 248 {
 249 DPRINTK("phy_init\n");
 250         dev->phy = &uPD98402_ops;
 251         return 0;
 252 }
 253
 254
 255 MODULE_LICENSE("GPL");
 256
 257 EXPORT_SYMBOL(uPD98402_init);
 258
 259 static __init int uPD98402_module_init(void)
 260 {
 261         return 0;
 262 }
 263 module_init(uPD98402_module_init);
 264 /* module_exit not defined so not unloadable */