1 /* drivers/atm/idt77105.c - IDT77105 (PHY) driver */
3 /* Written 1999 by Greg Banks, NEC Australia <gnb@linuxfan.com>. Based on suni.c */
6 #include <linux/module.h>
7 #include <linux/sched.h>
8 #include <linux/kernel.h>
10 #include <linux/errno.h>
11 #include <linux/atmdev.h>
12 #include <linux/sonet.h>
13 #include <linux/delay.h>
14 #include <linux/timer.h>
15 #include <linux/init.h>
16 #include <linux/capability.h>
17 #include <linux/atm_idt77105.h>
18 #include <linux/spinlock.h>
19 #include <asm/system.h>
20 #include <asm/param.h>
21 #include <asm/uaccess.h>
28 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
30 #define DPRINTK(format,args...)
34 struct idt77105_priv {
35 struct idt77105_stats stats; /* link diagnostics */
36 struct atm_dev *dev; /* device back-pointer */
37 struct idt77105_priv *next;
39 unsigned char old_mcr; /* storage of MCR reg while signal lost */
42 static DEFINE_SPINLOCK(idt77105_priv_lock);
44 #define PRIV(dev) ((struct idt77105_priv *) dev->phy_data)
46 #define PUT(val,reg) dev->ops->phy_put(dev,val,IDT77105_##reg)
47 #define GET(reg) dev->ops->phy_get(dev,IDT77105_##reg)
49 static void idt77105_stats_timer_func(unsigned long);
50 static void idt77105_restart_timer_func(unsigned long);
53 static struct timer_list stats_timer =
54 TIMER_INITIALIZER(idt77105_stats_timer_func, 0, 0);
55 static struct timer_list restart_timer =
56 TIMER_INITIALIZER(idt77105_restart_timer_func, 0, 0);
57 static int start_timer = 1;
58 static struct idt77105_priv *idt77105_all = NULL;
61 * Retrieve the value of one of the IDT77105's counters.
62 * `counter' is one of the IDT77105_CTRSEL_* constants.
64 static u16 get_counter(struct atm_dev *dev, int counter)
68 /* write the counter bit into PHY register 6 */
70 /* read the low 8 bits from register 4 */
72 /* read the high 8 bits from register 5 */
79 * Timer function called every second to gather statistics
80 * from the 77105. This is done because the h/w registers
81 * will overflow if not read at least once per second. The
82 * kernel's stats are much higher precision. Also, having
83 * a separate copy of the stats allows implementation of
84 * an ioctl which gathers the stats *without* zero'ing them.
86 static void idt77105_stats_timer_func(unsigned long dummy)
88 struct idt77105_priv *walk;
90 struct idt77105_stats *stats;
92 DPRINTK("IDT77105 gathering statistics\n");
93 for (walk = idt77105_all; walk; walk = walk->next) {
97 stats->symbol_errors += get_counter(dev, IDT77105_CTRSEL_SEC);
98 stats->tx_cells += get_counter(dev, IDT77105_CTRSEL_TCC);
99 stats->rx_cells += get_counter(dev, IDT77105_CTRSEL_RCC);
100 stats->rx_hec_errors += get_counter(dev, IDT77105_CTRSEL_RHEC);
102 if (!start_timer) mod_timer(&stats_timer,jiffies+IDT77105_STATS_TIMER_PERIOD);
107 * A separate timer func which handles restarting PHY chips which
108 * have had the cable re-inserted after being pulled out. This is
109 * done by polling the Good Signal Bit in the Interrupt Status
110 * register every 5 seconds. The other technique (checking Good
111 * Signal Bit in the interrupt handler) cannot be used because PHY
112 * interrupts need to be disabled when the cable is pulled out
113 * to avoid lots of spurious cell error interrupts.
115 static void idt77105_restart_timer_func(unsigned long dummy)
117 struct idt77105_priv *walk;
121 DPRINTK("IDT77105 checking for cable re-insertion\n");
122 for (walk = idt77105_all; walk; walk = walk->next) {
125 if (dev->signal != ATM_PHY_SIG_LOST)
128 istat = GET(ISTAT); /* side effect: clears all interrupt status bits */
129 if (istat & IDT77105_ISTAT_GOODSIG) {
130 /* Found signal again */
131 dev->signal = ATM_PHY_SIG_FOUND;
132 printk(KERN_NOTICE "%s(itf %d): signal detected again\n",
133 dev->type,dev->number);
134 /* flush the receive FIFO */
135 PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG);
136 /* re-enable interrupts */
137 PUT( walk->old_mcr ,MCR);
140 if (!start_timer) mod_timer(&restart_timer,jiffies+IDT77105_RESTART_TIMER_PERIOD);
144 static int fetch_stats(struct atm_dev *dev,struct idt77105_stats __user *arg,int zero)
147 struct idt77105_stats stats;
149 spin_lock_irqsave(&idt77105_priv_lock, flags);
150 memcpy(&stats, &PRIV(dev)->stats, sizeof(struct idt77105_stats));
152 memset(&PRIV(dev)->stats, 0, sizeof(struct idt77105_stats));
153 spin_unlock_irqrestore(&idt77105_priv_lock, flags);
156 return copy_to_user(arg, &PRIV(dev)->stats,
157 sizeof(struct idt77105_stats)) ? -EFAULT : 0;
161 static int set_loopback(struct atm_dev *dev,int mode)
165 diag = GET(DIAG) & ~IDT77105_DIAG_LCMASK;
170 diag |= IDT77105_DIAG_LC_PHY_LOOPBACK;
173 diag |= IDT77105_DIAG_LC_LINE_LOOPBACK;
179 printk(KERN_NOTICE "%s(%d) Loopback mode is: %s\n", dev->type,
181 (mode == ATM_LM_NONE ? "NONE" :
182 (mode == ATM_LM_LOC_ATM ? "DIAG (local)" :
183 (mode == IDT77105_DIAG_LC_LINE_LOOPBACK ? "LOOP (remote)" :
186 PRIV(dev)->loop_mode = mode;
191 static int idt77105_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
193 printk(KERN_NOTICE "%s(%d) idt77105_ioctl() called\n",dev->type,dev->number);
195 case IDT77105_GETSTATZ:
196 if (!capable(CAP_NET_ADMIN)) return -EPERM;
198 case IDT77105_GETSTAT:
199 return fetch_stats(dev, arg, cmd == IDT77105_GETSTATZ);
201 return set_loopback(dev,(int)(unsigned long) arg);
203 return put_user(PRIV(dev)->loop_mode,(int __user *)arg) ?
206 return put_user(ATM_LM_LOC_ATM | ATM_LM_RMT_ATM,
207 (int __user *) arg) ? -EFAULT : 0;
215 static void idt77105_int(struct atm_dev *dev)
219 istat = GET(ISTAT); /* side effect: clears all interrupt status bits */
221 DPRINTK("IDT77105 generated an interrupt, istat=%02x\n", (unsigned)istat);
223 if (istat & IDT77105_ISTAT_RSCC) {
224 /* Rx Signal Condition Change - line went up or down */
225 if (istat & IDT77105_ISTAT_GOODSIG) { /* signal detected again */
226 /* This should not happen (restart timer does it) but JIC */
227 dev->signal = ATM_PHY_SIG_FOUND;
228 } else { /* signal lost */
230 * Disable interrupts and stop all transmission and
231 * reception - the restart timer will restore these.
233 PRIV(dev)->old_mcr = GET(MCR);
239 ) & ~IDT77105_MCR_EIP, MCR);
240 dev->signal = ATM_PHY_SIG_LOST;
241 printk(KERN_NOTICE "%s(itf %d): signal lost\n",
242 dev->type,dev->number);
246 if (istat & IDT77105_ISTAT_RFO) {
247 /* Rx FIFO Overrun -- perform a FIFO flush */
248 PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG);
249 printk(KERN_NOTICE "%s(itf %d): receive FIFO overrun\n",
250 dev->type,dev->number);
253 if (istat & (IDT77105_ISTAT_HECERR | IDT77105_ISTAT_SCR |
254 IDT77105_ISTAT_RSE)) {
255 /* normally don't care - just report in stats */
256 printk(KERN_NOTICE "%s(itf %d): received cell with error\n",
257 dev->type,dev->number);
263 static int idt77105_start(struct atm_dev *dev)
267 if (!(dev->dev_data = kmalloc(sizeof(struct idt77105_priv),GFP_KERNEL)))
269 PRIV(dev)->dev = dev;
270 spin_lock_irqsave(&idt77105_priv_lock, flags);
271 PRIV(dev)->next = idt77105_all;
272 idt77105_all = PRIV(dev);
273 spin_unlock_irqrestore(&idt77105_priv_lock, flags);
274 memset(&PRIV(dev)->stats,0,sizeof(struct idt77105_stats));
276 /* initialise dev->signal from Good Signal Bit */
277 dev->signal = GET(ISTAT) & IDT77105_ISTAT_GOODSIG ? ATM_PHY_SIG_FOUND :
279 if (dev->signal == ATM_PHY_SIG_LOST)
280 printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type,
283 /* initialise loop mode from hardware */
284 switch ( GET(DIAG) & IDT77105_DIAG_LCMASK ) {
285 case IDT77105_DIAG_LC_NORMAL:
286 PRIV(dev)->loop_mode = ATM_LM_NONE;
288 case IDT77105_DIAG_LC_PHY_LOOPBACK:
289 PRIV(dev)->loop_mode = ATM_LM_LOC_ATM;
291 case IDT77105_DIAG_LC_LINE_LOOPBACK:
292 PRIV(dev)->loop_mode = ATM_LM_RMT_ATM;
296 /* enable interrupts, e.g. on loss of signal */
297 PRIV(dev)->old_mcr = GET(MCR);
298 if (dev->signal == ATM_PHY_SIG_FOUND) {
299 PRIV(dev)->old_mcr |= IDT77105_MCR_EIP;
300 PUT(PRIV(dev)->old_mcr, MCR);
304 idt77105_stats_timer_func(0); /* clear 77105 counters */
305 (void) fetch_stats(dev,NULL,1); /* clear kernel counters */
307 spin_lock_irqsave(&idt77105_priv_lock, flags);
311 init_timer(&stats_timer);
312 stats_timer.expires = jiffies+IDT77105_STATS_TIMER_PERIOD;
313 stats_timer.function = idt77105_stats_timer_func;
314 add_timer(&stats_timer);
316 init_timer(&restart_timer);
317 restart_timer.expires = jiffies+IDT77105_RESTART_TIMER_PERIOD;
318 restart_timer.function = idt77105_restart_timer_func;
319 add_timer(&restart_timer);
321 spin_unlock_irqrestore(&idt77105_priv_lock, flags);
326 static int idt77105_stop(struct atm_dev *dev)
328 struct idt77105_priv *walk, *prev;
330 DPRINTK("%s(itf %d): stopping IDT77105\n",dev->type,dev->number);
332 /* disable interrupts */
333 PUT( GET(MCR) & ~IDT77105_MCR_EIP, MCR );
335 /* detach private struct from atm_dev & free */
336 for (prev = NULL, walk = idt77105_all ;
338 prev = walk, walk = walk->next) {
339 if (walk->dev == dev) {
341 prev->next = walk->next;
343 idt77105_all = walk->next;
345 dev->dev_data = NULL;
355 static const struct atmphy_ops idt77105_ops = {
356 .start = idt77105_start,
357 .ioctl = idt77105_ioctl,
358 .interrupt = idt77105_int,
359 .stop = idt77105_stop,
363 int idt77105_init(struct atm_dev *dev)
365 dev->phy = &idt77105_ops;
369 EXPORT_SYMBOL(idt77105_init);
371 static void __exit idt77105_exit(void)
373 /* turn off timers */
374 del_timer(&stats_timer);
375 del_timer(&restart_timer);
378 module_exit(idt77105_exit);
380 MODULE_LICENSE("GPL");