LXR linux/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
  25struct 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
  39static 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
  57static 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
  85static 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
 101static 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
 134static 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
 168static 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
 184static 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
 209static 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
 231static 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
 239static 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
 247int uPD98402_init(struct atm_dev *dev)
 248{
 249DPRINTK("phy_init\n");
 250        dev->phy = &uPD98402_ops;
 251        return 0;
 252}
 253
 254
 255MODULE_LICENSE("GPL");
 256
 257EXPORT_SYMBOL(uPD98402_init);
 258
 259static __init int uPD98402_module_init(void)
 260{
 261        return 0;
 262}
 263module_init(uPD98402_module_init);
 264/* module_exit not defined so not unloadable */
 265