diff options
Diffstat (limited to 'drivers/atm/idt77105.c')
| -rw-r--r-- | drivers/atm/idt77105.c | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/drivers/atm/idt77105.c b/drivers/atm/idt77105.c new file mode 100644 index 000000000..bfca7b8a6 --- /dev/null +++ b/drivers/atm/idt77105.c @@ -0,0 +1,375 @@ +// 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; + fallthrough; + 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"); |