drivers/atm/uPD98402.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* drivers/atm/uPD98402.c - NEC uPD98402 (PHY) declarations */
   3
   4 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   5
   6
   7 #include <linux/module.h>
   8 #include <linux/mm.h>
   9 #include <linux/errno.h>
  10 #include <linux/atmdev.h>
  11 #include <linux/sonet.h>
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/uaccess.h>
  15 #include <linux/atomic.h>
  16
  17 #include "uPD98402.h"
  18
  19
  20 #if 0
  21 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
  22 #else
  23 #define DPRINTK(format,args...)
  24 #endif
  25
  26
  27 struct uPD98402_priv {
  28         struct k_sonet_stats sonet_stats;/* link diagnostics */
  29         unsigned char framing;          /* SONET/SDH framing */
  30         int loop_mode;                  /* loopback mode */
  31         spinlock_t lock;
  32 };
  33
  34
  35 #define PRIV(dev) ((struct uPD98402_priv *) dev->phy_data)
  36
  37 #define PUT(val,reg) dev->ops->phy_put(dev,val,uPD98402_##reg)
  38 #define GET(reg) dev->ops->phy_get(dev,uPD98402_##reg)
  39
  40
  41 static int fetch_stats(struct atm_dev *dev,struct sonet_stats __user *arg,int zero)
  42 {
  43         struct sonet_stats tmp;
  44         int error = 0;
  45
  46         atomic_add(GET(HECCT),&PRIV(dev)->sonet_stats.uncorr_hcs);
  47         sonet_copy_stats(&PRIV(dev)->sonet_stats,&tmp);
  48         if (arg) error = copy_to_user(arg,&tmp,sizeof(tmp));
  49         if (zero && !error) {
  50                 /* unused fields are reported as -1, but we must not "adjust"
  51                    them */
  52                 tmp.corr_hcs = tmp.tx_cells = tmp.rx_cells = 0;
  53                 sonet_subtract_stats(&PRIV(dev)->sonet_stats,&tmp);
  54         }
  55         return error ? -EFAULT : 0;
  56 }
  57
  58
  59 static int set_framing(struct atm_dev *dev,unsigned char framing)
  60 {
  61         static const unsigned char sonet[] = { 1,2,3,0 };
  62         static const unsigned char sdh[] = { 1,0,0,2 };
  63         const char *set;
  64         unsigned long flags;
  65
  66         switch (framing) {
  67                 case SONET_FRAME_SONET:
  68                         set = sonet;
  69                         break;
  70                 case SONET_FRAME_SDH:
  71                         set = sdh;
  72                         break;
  73                 default:
  74                         return -EINVAL;
  75         }
  76         spin_lock_irqsave(&PRIV(dev)->lock, flags);
  77         PUT(set[0],C11T);
  78         PUT(set[1],C12T);
  79         PUT(set[2],C13T);
  80         PUT((GET(MDR) & ~uPD98402_MDR_SS_MASK) | (set[3] <<
  81             uPD98402_MDR_SS_SHIFT),MDR);
  82         spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
  83         return 0;
  84 }
  85
  86
  87 static int get_sense(struct atm_dev *dev,u8 __user *arg)
  88 {
  89         unsigned long flags;
  90         unsigned char s[3];
  91
  92         spin_lock_irqsave(&PRIV(dev)->lock, flags);
  93         s[0] = GET(C11R);
  94         s[1] = GET(C12R);
  95         s[2] = GET(C13R);
  96         spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
  97         return (put_user(s[0], arg) || put_user(s[1], arg+1) ||
  98             put_user(s[2], arg+2) || put_user(0xff, arg+3) ||
  99             put_user(0xff, arg+4) || put_user(0xff, arg+5)) ? -EFAULT : 0;
 100 }
 101
 102
 103 static int set_loopback(struct atm_dev *dev,int mode)
 104 {
 105         unsigned char mode_reg;
 106
 107         mode_reg = GET(MDR) & ~(uPD98402_MDR_TPLP | uPD98402_MDR_ALP |
 108             uPD98402_MDR_RPLP);
 109         switch (__ATM_LM_XTLOC(mode)) {
 110                 case __ATM_LM_NONE:
 111                         break;
 112                 case __ATM_LM_PHY:
 113                         mode_reg |= uPD98402_MDR_TPLP;
 114                         break;
 115                 case __ATM_LM_ATM:
 116                         mode_reg |= uPD98402_MDR_ALP;
 117                         break;
 118                 default:
 119                         return -EINVAL;
 120         }
 121         switch (__ATM_LM_XTRMT(mode)) {
 122                 case __ATM_LM_NONE:
 123                         break;
 124                 case __ATM_LM_PHY:
 125                         mode_reg |= uPD98402_MDR_RPLP;
 126                         break;
 127                 default:
 128                         return -EINVAL;
 129         }
 130         PUT(mode_reg,MDR);
 131         PRIV(dev)->loop_mode = mode;
 132         return 0;
 133 }
 134
 135
 136 static int uPD98402_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
 137 {
 138         switch (cmd) {
 139
 140                 case SONET_GETSTATZ:
 141                 case SONET_GETSTAT:
 142                         return fetch_stats(dev,arg, cmd == SONET_GETSTATZ);
 143                 case SONET_SETFRAMING:
 144                         return set_framing(dev, (int)(unsigned long)arg);
 145                 case SONET_GETFRAMING:
 146                         return put_user(PRIV(dev)->framing,(int __user *)arg) ?
 147                             -EFAULT : 0;
 148                 case SONET_GETFRSENSE:
 149                         return get_sense(dev,arg);
 150                 case ATM_SETLOOP:
 151                         return set_loopback(dev, (int)(unsigned long)arg);
 152                 case ATM_GETLOOP:
 153                         return put_user(PRIV(dev)->loop_mode,(int __user *)arg) ?
 154                             -EFAULT : 0;
 155                 case ATM_QUERYLOOP:
 156                         return put_user(ATM_LM_LOC_PHY | ATM_LM_LOC_ATM |
 157                             ATM_LM_RMT_PHY,(int __user *)arg) ? -EFAULT : 0;
 158                 default:
 159                         return -ENOIOCTLCMD;
 160         }
 161 }
 162
 163
 164 #define ADD_LIMITED(s,v) \
 165     { atomic_add(GET(v),&PRIV(dev)->sonet_stats.s); \
 166     if (atomic_read(&PRIV(dev)->sonet_stats.s) < 0) \
 167         atomic_set(&PRIV(dev)->sonet_stats.s,INT_MAX); }
 168
 169
 170 static void stat_event(struct atm_dev *dev)
 171 {
 172         unsigned char events;
 173
 174         events = GET(PCR);
 175         if (events & uPD98402_PFM_PFEB) ADD_LIMITED(path_febe,PFECB);
 176         if (events & uPD98402_PFM_LFEB) ADD_LIMITED(line_febe,LECCT);
 177         if (events & uPD98402_PFM_B3E) ADD_LIMITED(path_bip,B3ECT);
 178         if (events & uPD98402_PFM_B2E) ADD_LIMITED(line_bip,B2ECT);
 179         if (events & uPD98402_PFM_B1E) ADD_LIMITED(section_bip,B1ECT);
 180 }
 181
 182
 183 #undef ADD_LIMITED
 184
 185
 186 static void uPD98402_int(struct atm_dev *dev)
 187 {
 188         static unsigned long silence = 0;
 189         unsigned char reason;
 190
 191         while ((reason = GET(PICR))) {
 192                 if (reason & uPD98402_INT_LOS)
 193                         printk(KERN_NOTICE "%s(itf %d): signal lost\n",
 194                             dev->type,dev->number);
 195                 if (reason & uPD98402_INT_PFM) stat_event(dev);
 196                 if (reason & uPD98402_INT_PCO) {
 197                         (void) GET(PCOCR); /* clear interrupt cause */
 198                         atomic_add(GET(HECCT),
 199                             &PRIV(dev)->sonet_stats.uncorr_hcs);
 200                 }
 201                 if ((reason & uPD98402_INT_RFO) &&
 202                     (time_after(jiffies, silence) || silence == 0)) {
 203                         printk(KERN_WARNING "%s(itf %d): uPD98402 receive "
 204                             "FIFO overflow\n",dev->type,dev->number);
 205                         silence = (jiffies+HZ/2)|1;
 206                 }
 207         }
 208 }
 209
 210
 211 static int uPD98402_start(struct atm_dev *dev)
 212 {
 213         DPRINTK("phy_start\n");
 214         if (!(dev->dev_data = kmalloc(sizeof(struct uPD98402_priv),GFP_KERNEL)))
 215                 return -ENOMEM;
 216         spin_lock_init(&PRIV(dev)->lock);
 217         memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats));
 218         (void) GET(PCR); /* clear performance events */
 219         PUT(uPD98402_PFM_FJ,PCMR); /* ignore frequency adj */
 220         (void) GET(PCOCR); /* clear overflows */
 221         PUT(~uPD98402_PCO_HECC,PCOMR);
 222         (void) GET(PICR); /* clear interrupts */
 223         PUT(~(uPD98402_INT_PFM | uPD98402_INT_ALM | uPD98402_INT_RFO |
 224           uPD98402_INT_LOS),PIMR); /* enable them */
 225         (void) fetch_stats(dev,NULL,1); /* clear kernel counters */
 226         atomic_set(&PRIV(dev)->sonet_stats.corr_hcs,-1);
 227         atomic_set(&PRIV(dev)->sonet_stats.tx_cells,-1);
 228         atomic_set(&PRIV(dev)->sonet_stats.rx_cells,-1);
 229         return 0;
 230 }
 231
 232
 233 static int uPD98402_stop(struct atm_dev *dev)
 234 {
 235         /* let SAR driver worry about stopping interrupts */
 236         kfree(PRIV(dev));
 237         return 0;
 238 }
 239
 240
 241 static const struct atmphy_ops uPD98402_ops = {
 242         .start          = uPD98402_start,
 243         .ioctl          = uPD98402_ioctl,
 244         .interrupt      = uPD98402_int,
 245         .stop           = uPD98402_stop,
 246 };
 247
 248
 249 int uPD98402_init(struct atm_dev *dev)
 250 {
 251 DPRINTK("phy_init\n");
 252         dev->phy = &uPD98402_ops;
 253         return 0;
 254 }
 255
 256
 257 MODULE_LICENSE("GPL");
 258
 259 EXPORT_SYMBOL(uPD98402_init);
 260
 261 static __init int uPD98402_module_init(void)
 262 {
 263         return 0;
 264 }
 265 module_init(uPD98402_module_init);
 266 /* module_exit not defined so not unloadable */