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/* drivers/atm/suni.c - PMC PM5346 SUNI (PHY) driver */
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
#include <linux/module.h>
#include <linux/sched.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 spinlock_t sunis_lock = SPIN_LOCK_UNLOCKED;
#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 *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 *arg,int set)
{
int todo;
if (get_user(todo,(int *) 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 *) arg) ? -EFAULT : 0;
}
#undef HANDLE_FLAG
static int get_diag(struct atm_dev *dev,void *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 *) 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 *arg)
{
switch (cmd) {
case SONET_GETSTATZ:
case SONET_GETSTAT:
return fetch_stats(dev,(struct sonet_stats *) 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 (arg != SONET_FRAME_SONET) return -EINVAL;
return 0;
case SONET_GETFRAMING:
return put_user(SONET_FRAME_SONET,(int *) arg) ?
-EFAULT : 0;
case SONET_GETFRSENSE:
return -EINVAL;
case ATM_SETLOOP:
return set_loopback(dev,(int) (long) arg);
case ATM_GETLOOP:
return put_user(PRIV(dev)->loop_mode,(int *) arg) ?
-EFAULT : 0;
case ATM_QUERYLOOP:
return put_user(ATM_LM_LOC_PHY | ATM_LM_RMT_PHY,
(int *) 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 (!(PRIV(dev) = kmalloc(sizeof(struct suni_priv),GFP_KERNEL)))
return -ENOMEM;
MOD_INC_USE_COUNT;
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));
MOD_DEC_USE_COUNT;
return 0;
}
static const struct atmphy_ops suni_ops = {
start: suni_start,
ioctl: suni_ioctl,
interrupt: suni_int,
stop: suni_stop,
};
int __init suni_init(struct atm_dev *dev)
{
unsigned char mri;
mri = GET(MRI); /* reset SUNI */
PUT(mri | SUNI_MRI_RESET,MRI);
PUT(mri,MRI);
PUT(0,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");
#ifdef MODULE
int init_module(void)
{
return 0;
}
void cleanup_module(void)
{
/* Nay */
}
#endif
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