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