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linux/drivers/atm/idt77105.c
Kees Cook 24ed960abf treewide: Switch DEFINE_TIMER callbacks to struct timer_list * 
This changes all DEFINE_TIMER() callbacks to use a struct timer_list
pointer instead of unsigned long. Since the data argument has already been
removed, none of these callbacks are using their argument currently, so
this renames the argument to "unused".

Done using the following semantic patch:

@match_define_timer@
declarer name DEFINE_TIMER;
identifier _timer, _callback;
@@

 DEFINE_TIMER(_timer, _callback);

@change_callback depends on match_define_timer@
identifier match_define_timer._callback;
type _origtype;
identifier _origarg;
@@

 void
-_callback(_origtype _origarg)
+_callback(struct timer_list *unused)
 { ... }

Signed-off-by: Kees Cook <keescook@chromium.org>
2017-11-21 15:57:05 -08:00

375 lines
11 KiB
C
Raw Blame History

/* 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->dev_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->dev_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");
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