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375 lines
11 KiB
375 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* drivers/atm/idt77105.c - IDT77105 (PHY) driver */ |
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/* Written 1999 by Greg Banks, NEC Australia <[email protected]>. Based on suni.c */ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/errno.h> |
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#include <linux/atmdev.h> |
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#include <linux/sonet.h> |
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#include <linux/delay.h> |
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#include <linux/timer.h> |
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#include <linux/init.h> |
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#include <linux/capability.h> |
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#include <linux/atm_idt77105.h> |
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#include <linux/spinlock.h> |
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#include <linux/slab.h> |
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#include <asm/param.h> |
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#include <linux/uaccess.h> |
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#include "idt77105.h" |
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#undef GENERAL_DEBUG |
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#ifdef GENERAL_DEBUG |
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#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) |
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#else |
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#define DPRINTK(format,args...) |
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#endif |
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struct idt77105_priv { |
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struct idt77105_stats stats; /* link diagnostics */ |
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struct atm_dev *dev; /* device back-pointer */ |
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struct idt77105_priv *next; |
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int loop_mode; |
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unsigned char old_mcr; /* storage of MCR reg while signal lost */ |
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}; |
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static DEFINE_SPINLOCK(idt77105_priv_lock); |
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#define PRIV(dev) ((struct idt77105_priv *) dev->phy_data) |
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#define PUT(val,reg) dev->ops->phy_put(dev,val,IDT77105_##reg) |
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#define GET(reg) dev->ops->phy_get(dev,IDT77105_##reg) |
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static void idt77105_stats_timer_func(struct timer_list *); |
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static void idt77105_restart_timer_func(struct timer_list *); |
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static DEFINE_TIMER(stats_timer, idt77105_stats_timer_func); |
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static DEFINE_TIMER(restart_timer, idt77105_restart_timer_func); |
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static int start_timer = 1; |
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static struct idt77105_priv *idt77105_all = NULL; |
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/* |
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* Retrieve the value of one of the IDT77105's counters. |
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* `counter' is one of the IDT77105_CTRSEL_* constants. |
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*/ |
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static u16 get_counter(struct atm_dev *dev, int counter) |
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{ |
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u16 val; |
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/* write the counter bit into PHY register 6 */ |
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PUT(counter, CTRSEL); |
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/* read the low 8 bits from register 4 */ |
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val = GET(CTRLO); |
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/* read the high 8 bits from register 5 */ |
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val |= GET(CTRHI)<<8; |
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return val; |
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} |
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/* |
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* Timer function called every second to gather statistics |
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* from the 77105. This is done because the h/w registers |
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* will overflow if not read at least once per second. The |
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* kernel's stats are much higher precision. Also, having |
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* a separate copy of the stats allows implementation of |
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* an ioctl which gathers the stats *without* zero'ing them. |
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*/ |
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static void idt77105_stats_timer_func(struct timer_list *unused) |
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{ |
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struct idt77105_priv *walk; |
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struct atm_dev *dev; |
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struct idt77105_stats *stats; |
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DPRINTK("IDT77105 gathering statistics\n"); |
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for (walk = idt77105_all; walk; walk = walk->next) { |
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dev = walk->dev; |
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stats = &walk->stats; |
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stats->symbol_errors += get_counter(dev, IDT77105_CTRSEL_SEC); |
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stats->tx_cells += get_counter(dev, IDT77105_CTRSEL_TCC); |
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stats->rx_cells += get_counter(dev, IDT77105_CTRSEL_RCC); |
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stats->rx_hec_errors += get_counter(dev, IDT77105_CTRSEL_RHEC); |
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} |
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if (!start_timer) mod_timer(&stats_timer,jiffies+IDT77105_STATS_TIMER_PERIOD); |
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} |
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/* |
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* A separate timer func which handles restarting PHY chips which |
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* have had the cable re-inserted after being pulled out. This is |
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* done by polling the Good Signal Bit in the Interrupt Status |
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* register every 5 seconds. The other technique (checking Good |
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* Signal Bit in the interrupt handler) cannot be used because PHY |
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* interrupts need to be disabled when the cable is pulled out |
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* to avoid lots of spurious cell error interrupts. |
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*/ |
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static void idt77105_restart_timer_func(struct timer_list *unused) |
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{ |
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struct idt77105_priv *walk; |
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struct atm_dev *dev; |
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unsigned char istat; |
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DPRINTK("IDT77105 checking for cable re-insertion\n"); |
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for (walk = idt77105_all; walk; walk = walk->next) { |
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dev = walk->dev; |
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if (dev->signal != ATM_PHY_SIG_LOST) |
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continue; |
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istat = GET(ISTAT); /* side effect: clears all interrupt status bits */ |
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if (istat & IDT77105_ISTAT_GOODSIG) { |
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/* Found signal again */ |
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atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND); |
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printk(KERN_NOTICE "%s(itf %d): signal detected again\n", |
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dev->type,dev->number); |
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/* flush the receive FIFO */ |
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PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG); |
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/* re-enable interrupts */ |
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PUT( walk->old_mcr ,MCR); |
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} |
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} |
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if (!start_timer) mod_timer(&restart_timer,jiffies+IDT77105_RESTART_TIMER_PERIOD); |
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} |
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static int fetch_stats(struct atm_dev *dev,struct idt77105_stats __user *arg,int zero) |
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{ |
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unsigned long flags; |
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struct idt77105_stats stats; |
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spin_lock_irqsave(&idt77105_priv_lock, flags); |
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memcpy(&stats, &PRIV(dev)->stats, sizeof(struct idt77105_stats)); |
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if (zero) |
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memset(&PRIV(dev)->stats, 0, sizeof(struct idt77105_stats)); |
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spin_unlock_irqrestore(&idt77105_priv_lock, flags); |
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if (arg == NULL) |
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return 0; |
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return copy_to_user(arg, &stats, |
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sizeof(struct idt77105_stats)) ? -EFAULT : 0; |
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} |
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static int set_loopback(struct atm_dev *dev,int mode) |
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{ |
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int diag; |
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diag = GET(DIAG) & ~IDT77105_DIAG_LCMASK; |
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switch (mode) { |
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case ATM_LM_NONE: |
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break; |
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case ATM_LM_LOC_ATM: |
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diag |= IDT77105_DIAG_LC_PHY_LOOPBACK; |
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break; |
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case ATM_LM_RMT_ATM: |
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diag |= IDT77105_DIAG_LC_LINE_LOOPBACK; |
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break; |
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default: |
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return -EINVAL; |
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} |
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PUT(diag,DIAG); |
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printk(KERN_NOTICE "%s(%d) Loopback mode is: %s\n", dev->type, |
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dev->number, |
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(mode == ATM_LM_NONE ? "NONE" : |
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(mode == ATM_LM_LOC_ATM ? "DIAG (local)" : |
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(mode == IDT77105_DIAG_LC_LINE_LOOPBACK ? "LOOP (remote)" : |
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"unknown"))) |
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); |
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PRIV(dev)->loop_mode = mode; |
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return 0; |
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} |
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static int idt77105_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg) |
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{ |
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printk(KERN_NOTICE "%s(%d) idt77105_ioctl() called\n",dev->type,dev->number); |
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switch (cmd) { |
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case IDT77105_GETSTATZ: |
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if (!capable(CAP_NET_ADMIN)) return -EPERM; |
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fallthrough; |
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case IDT77105_GETSTAT: |
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return fetch_stats(dev, arg, cmd == IDT77105_GETSTATZ); |
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case ATM_SETLOOP: |
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return set_loopback(dev,(int)(unsigned long) arg); |
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case ATM_GETLOOP: |
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return put_user(PRIV(dev)->loop_mode,(int __user *)arg) ? |
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-EFAULT : 0; |
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case ATM_QUERYLOOP: |
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return put_user(ATM_LM_LOC_ATM | ATM_LM_RMT_ATM, |
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(int __user *) arg) ? -EFAULT : 0; |
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default: |
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return -ENOIOCTLCMD; |
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} |
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} |
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static void idt77105_int(struct atm_dev *dev) |
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{ |
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unsigned char istat; |
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istat = GET(ISTAT); /* side effect: clears all interrupt status bits */ |
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DPRINTK("IDT77105 generated an interrupt, istat=%02x\n", (unsigned)istat); |
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if (istat & IDT77105_ISTAT_RSCC) { |
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/* Rx Signal Condition Change - line went up or down */ |
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if (istat & IDT77105_ISTAT_GOODSIG) { /* signal detected again */ |
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/* This should not happen (restart timer does it) but JIC */ |
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atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND); |
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} else { /* signal lost */ |
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/* |
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* Disable interrupts and stop all transmission and |
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* reception - the restart timer will restore these. |
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*/ |
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PRIV(dev)->old_mcr = GET(MCR); |
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PUT( |
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(PRIV(dev)->old_mcr| |
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IDT77105_MCR_DREC| |
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IDT77105_MCR_DRIC| |
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IDT77105_MCR_HALTTX |
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) & ~IDT77105_MCR_EIP, MCR); |
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atm_dev_signal_change(dev, ATM_PHY_SIG_LOST); |
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printk(KERN_NOTICE "%s(itf %d): signal lost\n", |
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dev->type,dev->number); |
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} |
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} |
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if (istat & IDT77105_ISTAT_RFO) { |
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/* Rx FIFO Overrun -- perform a FIFO flush */ |
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PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG); |
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printk(KERN_NOTICE "%s(itf %d): receive FIFO overrun\n", |
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dev->type,dev->number); |
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} |
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#ifdef GENERAL_DEBUG |
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if (istat & (IDT77105_ISTAT_HECERR | IDT77105_ISTAT_SCR | |
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IDT77105_ISTAT_RSE)) { |
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/* normally don't care - just report in stats */ |
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printk(KERN_NOTICE "%s(itf %d): received cell with error\n", |
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dev->type,dev->number); |
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} |
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#endif |
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} |
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static int idt77105_start(struct atm_dev *dev) |
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{ |
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unsigned long flags; |
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if (!(dev->phy_data = kmalloc(sizeof(struct idt77105_priv),GFP_KERNEL))) |
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return -ENOMEM; |
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PRIV(dev)->dev = dev; |
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spin_lock_irqsave(&idt77105_priv_lock, flags); |
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PRIV(dev)->next = idt77105_all; |
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idt77105_all = PRIV(dev); |
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spin_unlock_irqrestore(&idt77105_priv_lock, flags); |
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memset(&PRIV(dev)->stats,0,sizeof(struct idt77105_stats)); |
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/* initialise dev->signal from Good Signal Bit */ |
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atm_dev_signal_change(dev, |
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GET(ISTAT) & IDT77105_ISTAT_GOODSIG ? |
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ATM_PHY_SIG_FOUND : ATM_PHY_SIG_LOST); |
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if (dev->signal == ATM_PHY_SIG_LOST) |
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printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type, |
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dev->number); |
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/* initialise loop mode from hardware */ |
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switch ( GET(DIAG) & IDT77105_DIAG_LCMASK ) { |
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case IDT77105_DIAG_LC_NORMAL: |
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PRIV(dev)->loop_mode = ATM_LM_NONE; |
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break; |
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case IDT77105_DIAG_LC_PHY_LOOPBACK: |
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PRIV(dev)->loop_mode = ATM_LM_LOC_ATM; |
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break; |
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case IDT77105_DIAG_LC_LINE_LOOPBACK: |
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PRIV(dev)->loop_mode = ATM_LM_RMT_ATM; |
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break; |
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} |
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/* enable interrupts, e.g. on loss of signal */ |
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PRIV(dev)->old_mcr = GET(MCR); |
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if (dev->signal == ATM_PHY_SIG_FOUND) { |
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PRIV(dev)->old_mcr |= IDT77105_MCR_EIP; |
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PUT(PRIV(dev)->old_mcr, MCR); |
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} |
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idt77105_stats_timer_func(0); /* clear 77105 counters */ |
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(void) fetch_stats(dev,NULL,1); /* clear kernel counters */ |
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spin_lock_irqsave(&idt77105_priv_lock, flags); |
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if (start_timer) { |
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start_timer = 0; |
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stats_timer.expires = jiffies+IDT77105_STATS_TIMER_PERIOD; |
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add_timer(&stats_timer); |
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restart_timer.expires = jiffies+IDT77105_RESTART_TIMER_PERIOD; |
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add_timer(&restart_timer); |
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} |
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spin_unlock_irqrestore(&idt77105_priv_lock, flags); |
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return 0; |
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} |
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static int idt77105_stop(struct atm_dev *dev) |
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{ |
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struct idt77105_priv *walk, *prev; |
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DPRINTK("%s(itf %d): stopping IDT77105\n",dev->type,dev->number); |
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/* disable interrupts */ |
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PUT( GET(MCR) & ~IDT77105_MCR_EIP, MCR ); |
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/* detach private struct from atm_dev & free */ |
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for (prev = NULL, walk = idt77105_all ; |
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walk != NULL; |
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prev = walk, walk = walk->next) { |
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if (walk->dev == dev) { |
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if (prev != NULL) |
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prev->next = walk->next; |
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else |
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idt77105_all = walk->next; |
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dev->phy = NULL; |
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dev->phy_data = NULL; |
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kfree(walk); |
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break; |
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} |
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} |
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return 0; |
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} |
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static const struct atmphy_ops idt77105_ops = { |
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.start = idt77105_start, |
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.ioctl = idt77105_ioctl, |
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.interrupt = idt77105_int, |
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.stop = idt77105_stop, |
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}; |
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int idt77105_init(struct atm_dev *dev) |
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{ |
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dev->phy = &idt77105_ops; |
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return 0; |
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} |
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EXPORT_SYMBOL(idt77105_init); |
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static void __exit idt77105_exit(void) |
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{ |
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/* turn off timers */ |
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del_timer_sync(&stats_timer); |
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del_timer_sync(&restart_timer); |
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} |
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module_exit(idt77105_exit); |
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MODULE_LICENSE("GPL");
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