267 lines
6.5 KiB
C
267 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* drivers/atm/uPD98402.c - NEC uPD98402 (PHY) declarations */
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/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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#include <linux/module.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/init.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/atomic.h>
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#include "uPD98402.h"
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#if 0
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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 uPD98402_priv {
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struct k_sonet_stats sonet_stats;/* link diagnostics */
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unsigned char framing; /* SONET/SDH framing */
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int loop_mode; /* loopback mode */
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spinlock_t lock;
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};
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#define PRIV(dev) ((struct uPD98402_priv *) dev->phy_data)
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#define PUT(val,reg) dev->ops->phy_put(dev,val,uPD98402_##reg)
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#define GET(reg) dev->ops->phy_get(dev,uPD98402_##reg)
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static int fetch_stats(struct atm_dev *dev,struct sonet_stats __user *arg,int zero)
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{
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struct sonet_stats tmp;
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int error = 0;
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atomic_add(GET(HECCT),&PRIV(dev)->sonet_stats.uncorr_hcs);
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sonet_copy_stats(&PRIV(dev)->sonet_stats,&tmp);
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if (arg) error = copy_to_user(arg,&tmp,sizeof(tmp));
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if (zero && !error) {
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/* unused fields are reported as -1, but we must not "adjust"
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them */
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tmp.corr_hcs = tmp.tx_cells = tmp.rx_cells = 0;
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sonet_subtract_stats(&PRIV(dev)->sonet_stats,&tmp);
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}
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return error ? -EFAULT : 0;
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}
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static int set_framing(struct atm_dev *dev,unsigned char framing)
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{
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static const unsigned char sonet[] = { 1,2,3,0 };
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static const unsigned char sdh[] = { 1,0,0,2 };
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const char *set;
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unsigned long flags;
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switch (framing) {
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case SONET_FRAME_SONET:
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set = sonet;
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break;
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case SONET_FRAME_SDH:
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set = sdh;
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break;
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default:
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return -EINVAL;
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}
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spin_lock_irqsave(&PRIV(dev)->lock, flags);
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PUT(set[0],C11T);
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PUT(set[1],C12T);
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PUT(set[2],C13T);
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PUT((GET(MDR) & ~uPD98402_MDR_SS_MASK) | (set[3] <<
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uPD98402_MDR_SS_SHIFT),MDR);
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spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
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return 0;
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}
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static int get_sense(struct atm_dev *dev,u8 __user *arg)
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{
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unsigned long flags;
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unsigned char s[3];
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spin_lock_irqsave(&PRIV(dev)->lock, flags);
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s[0] = GET(C11R);
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s[1] = GET(C12R);
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s[2] = GET(C13R);
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spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
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return (put_user(s[0], arg) || put_user(s[1], arg+1) ||
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put_user(s[2], arg+2) || put_user(0xff, arg+3) ||
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put_user(0xff, arg+4) || put_user(0xff, arg+5)) ? -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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unsigned char mode_reg;
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mode_reg = GET(MDR) & ~(uPD98402_MDR_TPLP | uPD98402_MDR_ALP |
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uPD98402_MDR_RPLP);
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switch (__ATM_LM_XTLOC(mode)) {
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case __ATM_LM_NONE:
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break;
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case __ATM_LM_PHY:
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mode_reg |= uPD98402_MDR_TPLP;
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break;
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case __ATM_LM_ATM:
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mode_reg |= uPD98402_MDR_ALP;
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break;
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default:
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return -EINVAL;
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}
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switch (__ATM_LM_XTRMT(mode)) {
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case __ATM_LM_NONE:
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break;
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case __ATM_LM_PHY:
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mode_reg |= uPD98402_MDR_RPLP;
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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(mode_reg,MDR);
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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 uPD98402_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
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{
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switch (cmd) {
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case SONET_GETSTATZ:
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case SONET_GETSTAT:
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return fetch_stats(dev,arg, cmd == SONET_GETSTATZ);
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case SONET_SETFRAMING:
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return set_framing(dev, (int)(unsigned long)arg);
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case SONET_GETFRAMING:
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return put_user(PRIV(dev)->framing,(int __user *)arg) ?
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-EFAULT : 0;
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case SONET_GETFRSENSE:
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return get_sense(dev,arg);
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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_PHY | ATM_LM_LOC_ATM |
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ATM_LM_RMT_PHY,(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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#define ADD_LIMITED(s,v) \
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{ atomic_add(GET(v),&PRIV(dev)->sonet_stats.s); \
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if (atomic_read(&PRIV(dev)->sonet_stats.s) < 0) \
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atomic_set(&PRIV(dev)->sonet_stats.s,INT_MAX); }
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static void stat_event(struct atm_dev *dev)
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{
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unsigned char events;
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events = GET(PCR);
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if (events & uPD98402_PFM_PFEB) ADD_LIMITED(path_febe,PFECB);
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if (events & uPD98402_PFM_LFEB) ADD_LIMITED(line_febe,LECCT);
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if (events & uPD98402_PFM_B3E) ADD_LIMITED(path_bip,B3ECT);
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if (events & uPD98402_PFM_B2E) ADD_LIMITED(line_bip,B2ECT);
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if (events & uPD98402_PFM_B1E) ADD_LIMITED(section_bip,B1ECT);
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}
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#undef ADD_LIMITED
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static void uPD98402_int(struct atm_dev *dev)
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{
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static unsigned long silence = 0;
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unsigned char reason;
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while ((reason = GET(PICR))) {
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if (reason & uPD98402_INT_LOS)
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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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if (reason & uPD98402_INT_PFM) stat_event(dev);
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if (reason & uPD98402_INT_PCO) {
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(void) GET(PCOCR); /* clear interrupt cause */
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atomic_add(GET(HECCT),
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&PRIV(dev)->sonet_stats.uncorr_hcs);
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}
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if ((reason & uPD98402_INT_RFO) &&
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(time_after(jiffies, silence) || silence == 0)) {
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printk(KERN_WARNING "%s(itf %d): uPD98402 receive "
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"FIFO overflow\n",dev->type,dev->number);
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silence = (jiffies+HZ/2)|1;
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}
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}
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}
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static int uPD98402_start(struct atm_dev *dev)
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{
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DPRINTK("phy_start\n");
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if (!(dev->phy_data = kmalloc(sizeof(struct uPD98402_priv),GFP_KERNEL)))
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return -ENOMEM;
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spin_lock_init(&PRIV(dev)->lock);
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memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats));
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(void) GET(PCR); /* clear performance events */
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PUT(uPD98402_PFM_FJ,PCMR); /* ignore frequency adj */
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(void) GET(PCOCR); /* clear overflows */
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PUT(~uPD98402_PCO_HECC,PCOMR);
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(void) GET(PICR); /* clear interrupts */
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PUT(~(uPD98402_INT_PFM | uPD98402_INT_ALM | uPD98402_INT_RFO |
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uPD98402_INT_LOS),PIMR); /* enable them */
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(void) fetch_stats(dev,NULL,1); /* clear kernel counters */
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atomic_set(&PRIV(dev)->sonet_stats.corr_hcs,-1);
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atomic_set(&PRIV(dev)->sonet_stats.tx_cells,-1);
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atomic_set(&PRIV(dev)->sonet_stats.rx_cells,-1);
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return 0;
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}
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static int uPD98402_stop(struct atm_dev *dev)
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{
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/* let SAR driver worry about stopping interrupts */
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kfree(PRIV(dev));
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return 0;
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}
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static const struct atmphy_ops uPD98402_ops = {
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.start = uPD98402_start,
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.ioctl = uPD98402_ioctl,
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.interrupt = uPD98402_int,
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.stop = uPD98402_stop,
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};
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int uPD98402_init(struct atm_dev *dev)
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{
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DPRINTK("phy_init\n");
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dev->phy = &uPD98402_ops;
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return 0;
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}
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL(uPD98402_init);
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static __init int uPD98402_module_init(void)
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{
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return 0;
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}
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module_init(uPD98402_module_init);
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/* module_exit not defined so not unloadable */
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