drivers/atm/idt77105.c - third_party/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /* drivers/atm/idt77105.c - IDT77105 (PHY) driver */

 /* Written 1999 by Greg Banks, NEC Australia <gnb@linuxfan.com>. Based on suni.c */


 #include <linux/module.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_idt77105.h>
 #include <linux/spinlock.h>
 #include <linux/slab.h>
 #include <asm/param.h>
 #include <linux/uaccess.h>

 #include "idt77105.h"

 #undef GENERAL_DEBUG

 #ifdef GENERAL_DEBUG
 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
 #else
 #define DPRINTK(format,args...)
 #endif


 struct idt77105_priv {
 	struct idt77105_stats stats;    /* link diagnostics */
 	struct atm_dev *dev;		/* device back-pointer */
 	struct idt77105_priv *next;
         int loop_mode;
         unsigned char old_mcr;          /* storage of MCR reg while signal lost */
 };

 static DEFINE_SPINLOCK(idt77105_priv_lock);

 #define PRIV(dev) ((struct idt77105_priv *) dev->phy_data)

 #define PUT(val,reg) dev->ops->phy_put(dev,val,IDT77105_##reg)
 #define GET(reg) dev->ops->phy_get(dev,IDT77105_##reg)

 static void idt77105_stats_timer_func(struct timer_list *);
 static void idt77105_restart_timer_func(struct timer_list *);


 static DEFINE_TIMER(stats_timer, idt77105_stats_timer_func);
 static DEFINE_TIMER(restart_timer, idt77105_restart_timer_func);
 static int start_timer = 1;
 static struct idt77105_priv *idt77105_all = NULL;

 /*
  * Retrieve the value of one of the IDT77105's counters.
  * `counter' is one of the IDT77105_CTRSEL_* constants.
  */
 static u16 get_counter(struct atm_dev *dev, int counter)
 {
         u16 val;

         /* write the counter bit into PHY register 6 */
         PUT(counter, CTRSEL);
         /* read the low 8 bits from register 4 */
         val = GET(CTRLO);
         /* read the high 8 bits from register 5 */
         val |= GET(CTRHI)<<8;

         return val;
 }

 /*
  * Timer function called every second to gather statistics
  * from the 77105. This is done because the h/w registers
  * will overflow if not read at least once per second. The
  * kernel's stats are much higher precision. Also, having
  * a separate copy of the stats allows implementation of
  * an ioctl which gathers the stats *without* zero'ing them.
  */
 static void idt77105_stats_timer_func(struct timer_list *unused)
 {
 	struct idt77105_priv *walk;
 	struct atm_dev *dev;
 	struct idt77105_stats *stats;

         DPRINTK("IDT77105 gathering statistics\n");
 	for (walk = idt77105_all; walk; walk = walk->next) {
 		dev = walk->dev;

 		stats = &walk->stats;
                 stats->symbol_errors += get_counter(dev, IDT77105_CTRSEL_SEC);
                 stats->tx_cells += get_counter(dev, IDT77105_CTRSEL_TCC);
                 stats->rx_cells += get_counter(dev, IDT77105_CTRSEL_RCC);
                 stats->rx_hec_errors += get_counter(dev, IDT77105_CTRSEL_RHEC);
 	}
         if (!start_timer) mod_timer(&stats_timer,jiffies+IDT77105_STATS_TIMER_PERIOD);
 }


 /*
  * A separate timer func which handles restarting PHY chips which
  * have had the cable re-inserted after being pulled out. This is
  * done by polling the Good Signal Bit in the Interrupt Status
  * register every 5 seconds. The other technique (checking Good
  * Signal Bit in the interrupt handler) cannot be used because PHY
  * interrupts need to be disabled when the cable is pulled out
  * to avoid lots of spurious cell error interrupts.
  */
 static void idt77105_restart_timer_func(struct timer_list *unused)
 {
 	struct idt77105_priv *walk;
 	struct atm_dev *dev;
         unsigned char istat;

         DPRINTK("IDT77105 checking for cable re-insertion\n");
 	for (walk = idt77105_all; walk; walk = walk->next) {
 		dev = walk->dev;

                 if (dev->signal != ATM_PHY_SIG_LOST)
                     continue;

                 istat = GET(ISTAT); /* side effect: clears all interrupt status bits */
                 if (istat & IDT77105_ISTAT_GOODSIG) {
                     /* Found signal again */
                     atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND);
 	            printk(KERN_NOTICE "%s(itf %d): signal detected again\n",
                         dev->type,dev->number);
                     /* flush the receive FIFO */
                     PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG);
                     /* re-enable interrupts */
 	            PUT( walk->old_mcr ,MCR);
                 }
 	}
         if (!start_timer) mod_timer(&restart_timer,jiffies+IDT77105_RESTART_TIMER_PERIOD);
 }


 static int fetch_stats(struct atm_dev *dev,struct idt77105_stats __user *arg,int zero)
 {
 	unsigned long flags;
 	struct idt77105_stats stats;

 	spin_lock_irqsave(&idt77105_priv_lock, flags);
 	memcpy(&stats, &PRIV(dev)->stats, sizeof(struct idt77105_stats));
 	if (zero)
 		memset(&PRIV(dev)->stats, 0, sizeof(struct idt77105_stats));
 	spin_unlock_irqrestore(&idt77105_priv_lock, flags);
 	if (arg == NULL)
 		return 0;
 	return copy_to_user(arg, &stats,
 		    sizeof(struct idt77105_stats)) ? -EFAULT : 0;
 }


 static int set_loopback(struct atm_dev *dev,int mode)
 {
 	int diag;

 	diag = GET(DIAG) & ~IDT77105_DIAG_LCMASK;
 	switch (mode) {
 		case ATM_LM_NONE:
 			break;
 		case ATM_LM_LOC_ATM:
 			diag |= IDT77105_DIAG_LC_PHY_LOOPBACK;
 			break;
 		case ATM_LM_RMT_ATM:
 			diag |= IDT77105_DIAG_LC_LINE_LOOPBACK;
 			break;
 		default:
 			return -EINVAL;
 	}
 	PUT(diag,DIAG);
 	printk(KERN_NOTICE "%s(%d) Loopback mode is: %s\n", dev->type,
 	    dev->number,
 	    (mode == ATM_LM_NONE ? "NONE" :
 	      (mode == ATM_LM_LOC_ATM ? "DIAG (local)" :
 		(mode == IDT77105_DIAG_LC_LINE_LOOPBACK ? "LOOP (remote)" :
 		  "unknown")))
 		    );
 	PRIV(dev)->loop_mode = mode;
 	return 0;
 }


 static int idt77105_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
 {
         printk(KERN_NOTICE "%s(%d) idt77105_ioctl() called\n",dev->type,dev->number);
 	switch (cmd) {
 		case IDT77105_GETSTATZ:
 			if (!capable(CAP_NET_ADMIN)) return -EPERM;
 			/* fall through */
 		case IDT77105_GETSTAT:
 			return fetch_stats(dev, arg, cmd == IDT77105_GETSTATZ);
 		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_ATM | ATM_LM_RMT_ATM,
 			    (int __user *) arg) ? -EFAULT : 0;
 		default:
 			return -ENOIOCTLCMD;
 	}
 }


 static void idt77105_int(struct atm_dev *dev)
 {
         unsigned char istat;

         istat = GET(ISTAT); /* side effect: clears all interrupt status bits */

         DPRINTK("IDT77105 generated an interrupt, istat=%02x\n", (unsigned)istat);

         if (istat & IDT77105_ISTAT_RSCC) {
             /* Rx Signal Condition Change - line went up or down */
             if (istat & IDT77105_ISTAT_GOODSIG) {   /* signal detected again */
                 /* This should not happen (restart timer does it) but JIC */
 		atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND);
             } else {    /* signal lost */
                 /*
                  * Disable interrupts and stop all transmission and
                  * reception - the restart timer will restore these.
                  */
                 PRIV(dev)->old_mcr = GET(MCR);
 	        PUT(
                     (PRIV(dev)->old_mcr|
                     IDT77105_MCR_DREC|
                     IDT77105_MCR_DRIC|
                     IDT77105_MCR_HALTTX
                     ) & ~IDT77105_MCR_EIP, MCR);
 		atm_dev_signal_change(dev, ATM_PHY_SIG_LOST);
 	        printk(KERN_NOTICE "%s(itf %d): signal lost\n",
                     dev->type,dev->number);
             }
         }

         if (istat & IDT77105_ISTAT_RFO) {
             /* Rx FIFO Overrun -- perform a FIFO flush */
             PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG);
 	    printk(KERN_NOTICE "%s(itf %d): receive FIFO overrun\n",
                 dev->type,dev->number);
         }
 #ifdef GENERAL_DEBUG
         if (istat & (IDT77105_ISTAT_HECERR | IDT77105_ISTAT_SCR |
                      IDT77105_ISTAT_RSE)) {
             /* normally don't care - just report in stats */
 	    printk(KERN_NOTICE "%s(itf %d): received cell with error\n",
                 dev->type,dev->number);
         }
 #endif
 }


 static int idt77105_start(struct atm_dev *dev)
 {
 	unsigned long flags;

 	if (!(dev->phy_data = kmalloc(sizeof(struct idt77105_priv),GFP_KERNEL)))
 		return -ENOMEM;
 	PRIV(dev)->dev = dev;
 	spin_lock_irqsave(&idt77105_priv_lock, flags);
 	PRIV(dev)->next = idt77105_all;
 	idt77105_all = PRIV(dev);
 	spin_unlock_irqrestore(&idt77105_priv_lock, flags);
 	memset(&PRIV(dev)->stats,0,sizeof(struct idt77105_stats));

         /* initialise dev->signal from Good Signal Bit */
 	atm_dev_signal_change(dev,
 		GET(ISTAT) & IDT77105_ISTAT_GOODSIG ?
 		ATM_PHY_SIG_FOUND : ATM_PHY_SIG_LOST);
 	if (dev->signal == ATM_PHY_SIG_LOST)
 		printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type,
 		    dev->number);

         /* initialise loop mode from hardware */
         switch ( GET(DIAG) & IDT77105_DIAG_LCMASK ) {
         case IDT77105_DIAG_LC_NORMAL:
             PRIV(dev)->loop_mode = ATM_LM_NONE;
             break;
         case IDT77105_DIAG_LC_PHY_LOOPBACK:
             PRIV(dev)->loop_mode = ATM_LM_LOC_ATM;
             break;
         case IDT77105_DIAG_LC_LINE_LOOPBACK:
             PRIV(dev)->loop_mode = ATM_LM_RMT_ATM;
             break;
         }

         /* enable interrupts, e.g. on loss of signal */
         PRIV(dev)->old_mcr = GET(MCR);
         if (dev->signal == ATM_PHY_SIG_FOUND) {
             PRIV(dev)->old_mcr |= IDT77105_MCR_EIP;
 	    PUT(PRIV(dev)->old_mcr, MCR);
         }


 	idt77105_stats_timer_func(0); /* clear 77105 counters */
 	(void) fetch_stats(dev,NULL,1); /* clear kernel counters */

 	spin_lock_irqsave(&idt77105_priv_lock, flags);
 	if (start_timer) {
 		start_timer = 0;

 		stats_timer.expires = jiffies+IDT77105_STATS_TIMER_PERIOD;
 		add_timer(&stats_timer);

 		restart_timer.expires = jiffies+IDT77105_RESTART_TIMER_PERIOD;
 		add_timer(&restart_timer);
 	}
 	spin_unlock_irqrestore(&idt77105_priv_lock, flags);
 	return 0;
 }


 static int idt77105_stop(struct atm_dev *dev)
 {
 	struct idt77105_priv *walk, *prev;

         DPRINTK("%s(itf %d): stopping IDT77105\n",dev->type,dev->number);

         /* disable interrupts */
 	PUT( GET(MCR) & ~IDT77105_MCR_EIP, MCR );

         /* detach private struct from atm_dev & free */
 	for (prev = NULL, walk = idt77105_all ;
              walk != NULL;
              prev = walk, walk = walk->next) {
             if (walk->dev == dev) {
                 if (prev != NULL)
                     prev->next = walk->next;
                 else
                     idt77105_all = walk->next;
 	        dev->phy = NULL;
                 dev->phy_data = NULL;
                 kfree(walk);
                 break;
             }
         }

 	return 0;
 }


 static const struct atmphy_ops idt77105_ops = {
 	.start = 	idt77105_start,
 	.ioctl =	idt77105_ioctl,
 	.interrupt =	idt77105_int,
 	.stop =		idt77105_stop,
 };


 int idt77105_init(struct atm_dev *dev)
 {
 	dev->phy = &idt77105_ops;
 	return 0;
 }

 EXPORT_SYMBOL(idt77105_init);

 static void __exit idt77105_exit(void)
 {
 	/* turn off timers */
 	del_timer_sync(&stats_timer);
 	del_timer_sync(&restart_timer);
 }

 module_exit(idt77105_exit);

 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/* drivers/atm/idt77105.c - IDT77105 (PHY) driver */

	/* Written 1999 by Greg Banks, NEC Australia <gnb@linuxfan.com>. Based on suni.c */


	#include <linux/module.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_idt77105.h>
	#include <linux/spinlock.h>
	#include <linux/slab.h>
	#include <asm/param.h>
	#include <linux/uaccess.h>

	#include "idt77105.h"

	#undef GENERAL_DEBUG

	#ifdef GENERAL_DEBUG
	#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
	#else
	#define DPRINTK(format,args...)
	#endif


	struct idt77105_priv {
	struct idt77105_stats stats; /* link diagnostics */
	struct atm_dev dev; / device back-pointer */
	struct idt77105_priv *next;
	int loop_mode;
	unsigned char old_mcr; /* storage of MCR reg while signal lost */
	};

	static DEFINE_SPINLOCK(idt77105_priv_lock);

	#define PRIV(dev) ((struct idt77105_priv *) dev->phy_data)

	#define PUT(val,reg) dev->ops->phy_put(dev,val,IDT77105_##reg)
	#define GET(reg) dev->ops->phy_get(dev,IDT77105_##reg)

	static void idt77105_stats_timer_func(struct timer_list *);
	static void idt77105_restart_timer_func(struct timer_list *);


	static DEFINE_TIMER(stats_timer, idt77105_stats_timer_func);
	static DEFINE_TIMER(restart_timer, idt77105_restart_timer_func);
	static int start_timer = 1;
	static struct idt77105_priv *idt77105_all = NULL;

	/*
	* Retrieve the value of one of the IDT77105's counters.
	* `counter' is one of the IDT77105_CTRSEL_* constants.
	*/
	static u16 get_counter(struct atm_dev *dev, int counter)
	{
	u16 val;

	/* write the counter bit into PHY register 6 */
	PUT(counter, CTRSEL);
	/* read the low 8 bits from register 4 */
	val = GET(CTRLO);
	/* read the high 8 bits from register 5 */
	val \|= GET(CTRHI)<<8;

	return val;
	}

	/*
	* Timer function called every second to gather statistics
	* from the 77105. This is done because the h/w registers
	* will overflow if not read at least once per second. The
	* kernel's stats are much higher precision. Also, having
	* a separate copy of the stats allows implementation of
	* an ioctl which gathers the stats without zero'ing them.
	*/
	static void idt77105_stats_timer_func(struct timer_list *unused)
	{
	struct idt77105_priv *walk;
	struct atm_dev *dev;
	struct idt77105_stats *stats;

	DPRINTK("IDT77105 gathering statistics\n");
	for (walk = idt77105_all; walk; walk = walk->next) {
	dev = walk->dev;

	stats = &walk->stats;
	stats->symbol_errors += get_counter(dev, IDT77105_CTRSEL_SEC);
	stats->tx_cells += get_counter(dev, IDT77105_CTRSEL_TCC);
	stats->rx_cells += get_counter(dev, IDT77105_CTRSEL_RCC);
	stats->rx_hec_errors += get_counter(dev, IDT77105_CTRSEL_RHEC);
	}
	if (!start_timer) mod_timer(&stats_timer,jiffies+IDT77105_STATS_TIMER_PERIOD);
	}


	/*
	* A separate timer func which handles restarting PHY chips which
	* have had the cable re-inserted after being pulled out. This is
	* done by polling the Good Signal Bit in the Interrupt Status
	* register every 5 seconds. The other technique (checking Good
	* Signal Bit in the interrupt handler) cannot be used because PHY
	* interrupts need to be disabled when the cable is pulled out
	* to avoid lots of spurious cell error interrupts.
	*/
	static void idt77105_restart_timer_func(struct timer_list *unused)
	{
	struct idt77105_priv *walk;
	struct atm_dev *dev;
	unsigned char istat;

	DPRINTK("IDT77105 checking for cable re-insertion\n");
	for (walk = idt77105_all; walk; walk = walk->next) {
	dev = walk->dev;

	if (dev->signal != ATM_PHY_SIG_LOST)
	continue;

	istat = GET(ISTAT); /* side effect: clears all interrupt status bits */
	if (istat & IDT77105_ISTAT_GOODSIG) {
	/* Found signal again */
	atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND);
	printk(KERN_NOTICE "%s(itf %d): signal detected again\n",
	dev->type,dev->number);
	/* flush the receive FIFO */
	PUT( GET(DIAG) \| IDT77105_DIAG_RFLUSH, DIAG);
	/* re-enable interrupts */
	PUT( walk->old_mcr ,MCR);
	}
	}
	if (!start_timer) mod_timer(&restart_timer,jiffies+IDT77105_RESTART_TIMER_PERIOD);
	}


	static int fetch_stats(struct atm_dev dev,struct idt77105_stats __user arg,int zero)
	{
	unsigned long flags;
	struct idt77105_stats stats;

	spin_lock_irqsave(&idt77105_priv_lock, flags);
	memcpy(&stats, &PRIV(dev)->stats, sizeof(struct idt77105_stats));
	if (zero)
	memset(&PRIV(dev)->stats, 0, sizeof(struct idt77105_stats));
	spin_unlock_irqrestore(&idt77105_priv_lock, flags);
	if (arg == NULL)
	return 0;
	return copy_to_user(arg, &stats,
	sizeof(struct idt77105_stats)) ? -EFAULT : 0;
	}


	static int set_loopback(struct atm_dev *dev,int mode)
	{
	int diag;

	diag = GET(DIAG) & ~IDT77105_DIAG_LCMASK;
	switch (mode) {
	case ATM_LM_NONE:
	break;
	case ATM_LM_LOC_ATM:
	diag \|= IDT77105_DIAG_LC_PHY_LOOPBACK;
	break;
	case ATM_LM_RMT_ATM:
	diag \|= IDT77105_DIAG_LC_LINE_LOOPBACK;
	break;
	default:
	return -EINVAL;
	}
	PUT(diag,DIAG);
	printk(KERN_NOTICE "%s(%d) Loopback mode is: %s\n", dev->type,
	dev->number,
	(mode == ATM_LM_NONE ? "NONE" :
	(mode == ATM_LM_LOC_ATM ? "DIAG (local)" :
	(mode == IDT77105_DIAG_LC_LINE_LOOPBACK ? "LOOP (remote)" :
	"unknown")))
	);
	PRIV(dev)->loop_mode = mode;
	return 0;
	}


	static int idt77105_ioctl(struct atm_dev dev,unsigned int cmd,void __user arg)
	{
	printk(KERN_NOTICE "%s(%d) idt77105_ioctl() called\n",dev->type,dev->number);
	switch (cmd) {
	case IDT77105_GETSTATZ:
	if (!capable(CAP_NET_ADMIN)) return -EPERM;
	/* fall through */
	case IDT77105_GETSTAT:
	return fetch_stats(dev, arg, cmd == IDT77105_GETSTATZ);
	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_ATM \| ATM_LM_RMT_ATM,
	(int __user *) arg) ? -EFAULT : 0;
	default:
	return -ENOIOCTLCMD;
	}
	}



	static void idt77105_int(struct atm_dev *dev)
	{
	unsigned char istat;

	istat = GET(ISTAT); /* side effect: clears all interrupt status bits */

	DPRINTK("IDT77105 generated an interrupt, istat=%02x\n", (unsigned)istat);

	if (istat & IDT77105_ISTAT_RSCC) {
	/* Rx Signal Condition Change - line went up or down */
	if (istat & IDT77105_ISTAT_GOODSIG) { /* signal detected again */
	/* This should not happen (restart timer does it) but JIC */
	atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND);
	} else { /* signal lost */
	/*
	* Disable interrupts and stop all transmission and
	* reception - the restart timer will restore these.
	*/
	PRIV(dev)->old_mcr = GET(MCR);
	PUT(
	(PRIV(dev)->old_mcr\|
	IDT77105_MCR_DREC\|
	IDT77105_MCR_DRIC\|
	IDT77105_MCR_HALTTX
	) & ~IDT77105_MCR_EIP, MCR);
	atm_dev_signal_change(dev, ATM_PHY_SIG_LOST);
	printk(KERN_NOTICE "%s(itf %d): signal lost\n",
	dev->type,dev->number);
	}
	}

	if (istat & IDT77105_ISTAT_RFO) {
	/* Rx FIFO Overrun -- perform a FIFO flush */
	PUT( GET(DIAG) \| IDT77105_DIAG_RFLUSH, DIAG);
	printk(KERN_NOTICE "%s(itf %d): receive FIFO overrun\n",
	dev->type,dev->number);
	}
	#ifdef GENERAL_DEBUG
	if (istat & (IDT77105_ISTAT_HECERR \| IDT77105_ISTAT_SCR \|
	IDT77105_ISTAT_RSE)) {
	/* normally don't care - just report in stats */
	printk(KERN_NOTICE "%s(itf %d): received cell with error\n",
	dev->type,dev->number);
	}
	#endif
	}


	static int idt77105_start(struct atm_dev *dev)
	{
	unsigned long flags;

	if (!(dev->phy_data = kmalloc(sizeof(struct idt77105_priv),GFP_KERNEL)))
	return -ENOMEM;
	PRIV(dev)->dev = dev;
	spin_lock_irqsave(&idt77105_priv_lock, flags);
	PRIV(dev)->next = idt77105_all;
	idt77105_all = PRIV(dev);
	spin_unlock_irqrestore(&idt77105_priv_lock, flags);
	memset(&PRIV(dev)->stats,0,sizeof(struct idt77105_stats));

	/* initialise dev->signal from Good Signal Bit */
	atm_dev_signal_change(dev,
	GET(ISTAT) & IDT77105_ISTAT_GOODSIG ?
	ATM_PHY_SIG_FOUND : ATM_PHY_SIG_LOST);
	if (dev->signal == ATM_PHY_SIG_LOST)
	printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type,
	dev->number);

	/* initialise loop mode from hardware */
	switch ( GET(DIAG) & IDT77105_DIAG_LCMASK ) {
	case IDT77105_DIAG_LC_NORMAL:
	PRIV(dev)->loop_mode = ATM_LM_NONE;
	break;
	case IDT77105_DIAG_LC_PHY_LOOPBACK:
	PRIV(dev)->loop_mode = ATM_LM_LOC_ATM;
	break;
	case IDT77105_DIAG_LC_LINE_LOOPBACK:
	PRIV(dev)->loop_mode = ATM_LM_RMT_ATM;
	break;
	}

	/* enable interrupts, e.g. on loss of signal */
	PRIV(dev)->old_mcr = GET(MCR);
	if (dev->signal == ATM_PHY_SIG_FOUND) {
	PRIV(dev)->old_mcr \|= IDT77105_MCR_EIP;
	PUT(PRIV(dev)->old_mcr, MCR);
	}


	idt77105_stats_timer_func(0); /* clear 77105 counters */
	(void) fetch_stats(dev,NULL,1); /* clear kernel counters */

	spin_lock_irqsave(&idt77105_priv_lock, flags);
	if (start_timer) {
	start_timer = 0;

	stats_timer.expires = jiffies+IDT77105_STATS_TIMER_PERIOD;
	add_timer(&stats_timer);

	restart_timer.expires = jiffies+IDT77105_RESTART_TIMER_PERIOD;
	add_timer(&restart_timer);
	}
	spin_unlock_irqrestore(&idt77105_priv_lock, flags);
	return 0;
	}


	static int idt77105_stop(struct atm_dev *dev)
	{
	struct idt77105_priv walk, prev;

	DPRINTK("%s(itf %d): stopping IDT77105\n",dev->type,dev->number);

	/* disable interrupts */
	PUT( GET(MCR) & ~IDT77105_MCR_EIP, MCR );

	/* detach private struct from atm_dev & free */
	for (prev = NULL, walk = idt77105_all ;
	walk != NULL;
	prev = walk, walk = walk->next) {
	if (walk->dev == dev) {
	if (prev != NULL)
	prev->next = walk->next;
	else
	idt77105_all = walk->next;
	dev->phy = NULL;
	dev->phy_data = NULL;
	kfree(walk);
	break;
	}
	}

	return 0;
	}


	static const struct atmphy_ops idt77105_ops = {
	.start = idt77105_start,
	.ioctl = idt77105_ioctl,
	.interrupt = idt77105_int,
	.stop = idt77105_stop,
	};


	int idt77105_init(struct atm_dev *dev)
	{
	dev->phy = &idt77105_ops;
	return 0;
	}

	EXPORT_SYMBOL(idt77105_init);

	static void __exit idt77105_exit(void)
	{
	/* turn off timers */
	del_timer_sync(&stats_timer);
	del_timer_sync(&restart_timer);
	}

	module_exit(idt77105_exit);

	MODULE_LICENSE("GPL");