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suni.c

/* drivers/atm/suni.c - PMC PM5346 SUNI (PHY) driver */
 
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */


#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/atmdev.h>
#include <linux/sonet.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/atm_suni.h>
#include <asm/system.h>
#include <asm/param.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>

#include "suni.h"


#if 0
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif


struct suni_priv {
      struct k_sonet_stats sonet_stats; /* link diagnostics */
      int loop_mode;                /* loopback mode */
      struct atm_dev *dev;          /* device back-pointer */
      struct suni_priv *next;       /* next SUNI */
};


#define PRIV(dev) ((struct suni_priv *) dev->phy_data)

#define PUT(val,reg) dev->ops->phy_put(dev,val,SUNI_##reg)
#define GET(reg) dev->ops->phy_get(dev,SUNI_##reg)
#define REG_CHANGE(mask,shift,value,reg) \
  PUT((GET(reg) & ~(mask)) | ((value) << (shift)),reg)


static struct timer_list poll_timer;
static struct suni_priv *sunis = NULL;
static DEFINE_SPINLOCK(sunis_lock);


#define ADD_LIMITED(s,v) \
    atomic_add((v),&stats->s); \
    if (atomic_read(&stats->s) < 0) atomic_set(&stats->s,INT_MAX);


static void suni_hz(unsigned long from_timer)
{
      struct suni_priv *walk;
      struct atm_dev *dev;
      struct k_sonet_stats *stats;

      for (walk = sunis; walk; walk = walk->next) {
            dev = walk->dev;
            stats = &walk->sonet_stats;
            PUT(0,MRI); /* latch counters */
            udelay(1);
            ADD_LIMITED(section_bip,(GET(RSOP_SBL) & 0xff) |
                ((GET(RSOP_SBM) & 0xff) << 8));
            ADD_LIMITED(line_bip,(GET(RLOP_LBL) & 0xff) |
                ((GET(RLOP_LB) & 0xff) << 8) |
                ((GET(RLOP_LBM) & 0xf) << 16));
            ADD_LIMITED(path_bip,(GET(RPOP_PBL) & 0xff) |
                ((GET(RPOP_PBM) & 0xff) << 8));
            ADD_LIMITED(line_febe,(GET(RLOP_LFL) & 0xff) |
                ((GET(RLOP_LF) & 0xff) << 8) |
                ((GET(RLOP_LFM) & 0xf) << 16));
            ADD_LIMITED(path_febe,(GET(RPOP_PFL) & 0xff) |
                ((GET(RPOP_PFM) & 0xff) << 8));
            ADD_LIMITED(corr_hcs,GET(RACP_CHEC) & 0xff);
            ADD_LIMITED(uncorr_hcs,GET(RACP_UHEC) & 0xff);
            ADD_LIMITED(rx_cells,(GET(RACP_RCCL) & 0xff) |
                ((GET(RACP_RCC) & 0xff) << 8) |
                ((GET(RACP_RCCM) & 7) << 16));
            ADD_LIMITED(tx_cells,(GET(TACP_TCCL) & 0xff) |
                ((GET(TACP_TCC) & 0xff) << 8) |
                ((GET(TACP_TCCM) & 7) << 16));
      }
      if (from_timer) mod_timer(&poll_timer,jiffies+HZ);
}


#undef ADD_LIMITED


static int fetch_stats(struct atm_dev *dev,struct sonet_stats __user *arg,int zero)
{
      struct sonet_stats tmp;
      int error = 0;

      sonet_copy_stats(&PRIV(dev)->sonet_stats,&tmp);
      if (arg) error = copy_to_user(arg,&tmp,sizeof(tmp));
      if (zero && !error) sonet_subtract_stats(&PRIV(dev)->sonet_stats,&tmp);
      return error ? -EFAULT : 0;
}


#define HANDLE_FLAG(flag,reg,bit) \
  if (todo & flag) { \
    if (set) PUT(GET(reg) | bit,reg); \
    else PUT(GET(reg) & ~bit,reg); \
    todo &= ~flag; \
  }


static int change_diag(struct atm_dev *dev,void __user *arg,int set)
{
      int todo;

      if (get_user(todo,(int __user *)arg)) return -EFAULT;
      HANDLE_FLAG(SONET_INS_SBIP,TSOP_DIAG,SUNI_TSOP_DIAG_DBIP8);
      HANDLE_FLAG(SONET_INS_LBIP,TLOP_DIAG,SUNI_TLOP_DIAG_DBIP);
      HANDLE_FLAG(SONET_INS_PBIP,TPOP_CD,SUNI_TPOP_DIAG_DB3);
      HANDLE_FLAG(SONET_INS_FRAME,RSOP_CIE,SUNI_RSOP_CIE_FOOF);
      HANDLE_FLAG(SONET_INS_LAIS,TSOP_CTRL,SUNI_TSOP_CTRL_LAIS);
      HANDLE_FLAG(SONET_INS_PAIS,TPOP_CD,SUNI_TPOP_DIAG_PAIS);
      HANDLE_FLAG(SONET_INS_LOS,TSOP_DIAG,SUNI_TSOP_DIAG_DLOS);
      HANDLE_FLAG(SONET_INS_HCS,TACP_CS,SUNI_TACP_CS_DHCS);
      return put_user(todo,(int __user *)arg) ? -EFAULT : 0;
}


#undef HANDLE_FLAG


static int get_diag(struct atm_dev *dev,void __user *arg)
{
      int set;

      set = 0;
      if (GET(TSOP_DIAG) & SUNI_TSOP_DIAG_DBIP8) set |= SONET_INS_SBIP;
      if (GET(TLOP_DIAG) & SUNI_TLOP_DIAG_DBIP) set |= SONET_INS_LBIP;
      if (GET(TPOP_CD) & SUNI_TPOP_DIAG_DB3) set |= SONET_INS_PBIP;
      /* SONET_INS_FRAME is one-shot only */
      if (GET(TSOP_CTRL) & SUNI_TSOP_CTRL_LAIS) set |= SONET_INS_LAIS;
      if (GET(TPOP_CD) & SUNI_TPOP_DIAG_PAIS) set |= SONET_INS_PAIS;
      if (GET(TSOP_DIAG) & SUNI_TSOP_DIAG_DLOS) set |= SONET_INS_LOS;
      if (GET(TACP_CS) & SUNI_TACP_CS_DHCS) set |= SONET_INS_HCS;
      return put_user(set,(int __user *)arg) ? -EFAULT : 0;
}


static int set_loopback(struct atm_dev *dev,int mode)
{
      unsigned char control;

      control = GET(MCT) & ~(SUNI_MCT_DLE | SUNI_MCT_LLE);
      switch (mode) {
            case ATM_LM_NONE:
                  break;
            case ATM_LM_LOC_PHY:
                  control |= SUNI_MCT_DLE;
                  break;
            case ATM_LM_RMT_PHY:
                  control |= SUNI_MCT_LLE;
                  break;
            default:
                  return -EINVAL;
      }
      PUT(control,MCT);
      PRIV(dev)->loop_mode = mode;
      return 0;
}


static int suni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
{
      switch (cmd) {
            case SONET_GETSTATZ:
            case SONET_GETSTAT:
                  return fetch_stats(dev, arg, cmd == SONET_GETSTATZ);
            case SONET_SETDIAG:
                  return change_diag(dev,arg,1);
            case SONET_CLRDIAG:
                  return change_diag(dev,arg,0);
            case SONET_GETDIAG:
                  return get_diag(dev,arg);
            case SONET_SETFRAMING:
                  if ((int)(unsigned long)arg != SONET_FRAME_SONET) return -EINVAL;
                  return 0;
            case SONET_GETFRAMING:
                  return put_user(SONET_FRAME_SONET,(int __user *)arg) ?
                      -EFAULT : 0;
            case SONET_GETFRSENSE:
                  return -EINVAL;
            case ATM_SETLOOP:
                  return set_loopback(dev,(int)(unsigned long)arg);
            case ATM_GETLOOP:
                  return put_user(PRIV(dev)->loop_mode,(int __user *)arg) ?
                      -EFAULT : 0;
            case ATM_QUERYLOOP:
                  return put_user(ATM_LM_LOC_PHY | ATM_LM_RMT_PHY,
                      (int __user *) arg) ? -EFAULT : 0;
            default:
                  return -ENOIOCTLCMD;
      }
}


static void poll_los(struct atm_dev *dev)
{
      dev->signal = GET(RSOP_SIS) & SUNI_RSOP_SIS_LOSV ? ATM_PHY_SIG_LOST :
        ATM_PHY_SIG_FOUND;
}


static void suni_int(struct atm_dev *dev)
{
      poll_los(dev);
      printk(KERN_NOTICE "%s(itf %d): signal %s\n",dev->type,dev->number,
          dev->signal == ATM_PHY_SIG_LOST ?  "lost" : "detected again");
}


static int suni_start(struct atm_dev *dev)
{
      unsigned long flags;
      int first;

      if (!(dev->phy_data = kmalloc(sizeof(struct suni_priv),GFP_KERNEL)))
            return -ENOMEM;

      PRIV(dev)->dev = dev;
      spin_lock_irqsave(&sunis_lock,flags);
      first = !sunis;
      PRIV(dev)->next = sunis;
      sunis = PRIV(dev);
      spin_unlock_irqrestore(&sunis_lock,flags);
      memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats));
      PUT(GET(RSOP_CIE) | SUNI_RSOP_CIE_LOSE,RSOP_CIE);
            /* interrupt on loss of signal */
      poll_los(dev); /* ... and clear SUNI interrupts */
      if (dev->signal == ATM_PHY_SIG_LOST)
            printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type,
                dev->number);
      PRIV(dev)->loop_mode = ATM_LM_NONE;
      suni_hz(0); /* clear SUNI counters */
      (void) fetch_stats(dev,NULL,1); /* clear kernel counters */
      if (first) {
            init_timer(&poll_timer);
            poll_timer.expires = jiffies+HZ;
            poll_timer.function = suni_hz;
            poll_timer.data = 1;
#if 0
printk(KERN_DEBUG "[u] p=0x%lx,n=0x%lx\n",(unsigned long) poll_timer.list.prev,
    (unsigned long) poll_timer.list.next);
#endif
            add_timer(&poll_timer);
      }
      return 0;
}


static int suni_stop(struct atm_dev *dev)
{
      struct suni_priv **walk;
      unsigned long flags;

      /* let SAR driver worry about stopping interrupts */
      spin_lock_irqsave(&sunis_lock,flags);
      for (walk = &sunis; *walk != PRIV(dev);
          walk = &PRIV((*walk)->dev)->next);
      *walk = PRIV((*walk)->dev)->next;
      if (!sunis) del_timer_sync(&poll_timer);
      spin_unlock_irqrestore(&sunis_lock,flags);
      kfree(PRIV(dev));

      return 0;
}


static const struct atmphy_ops suni_ops = {
      .start            = suni_start,
      .ioctl            = suni_ioctl,
      .interrupt  = suni_int,
      .stop       = suni_stop,
};


int suni_init(struct atm_dev *dev)
{
      unsigned char mri;

      mri = GET(MRI); /* reset SUNI */
      PUT(mri | SUNI_MRI_RESET,MRI);
      PUT(mri,MRI);
      PUT((GET(MT) & SUNI_MT_DS27_53),MT); /* disable all tests */
      REG_CHANGE(SUNI_TPOP_APM_S,SUNI_TPOP_APM_S_SHIFT,SUNI_TPOP_S_SONET,
          TPOP_APM); /* use SONET */
      REG_CHANGE(SUNI_TACP_IUCHP_CLP,0,SUNI_TACP_IUCHP_CLP,
          TACP_IUCHP); /* idle cells */
      PUT(SUNI_IDLE_PATTERN,TACP_IUCPOP);
      dev->phy = &suni_ops;
      return 0;
}

EXPORT_SYMBOL(suni_init);

MODULE_LICENSE("GPL");

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