1 files changed, 266 insertions, 0 deletions
diff --git a/drivers/atm/uPD98402.c b/drivers/atm/uPD98402.c
new file mode 100644
index 000000000..239852d85
--- /dev/null
+++ b/drivers/atm/uPD98402.c
@@ -0,0 +1,266 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* drivers/atm/uPD98402.c - NEC uPD98402 (PHY) declarations */
+ 
+/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
+ 
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/atmdev.h>
+#include <linux/sonet.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/atomic.h>
+
+#include "uPD98402.h"
+
+
+#if 0
+#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
+#else
+#define DPRINTK(format,args...)
+#endif
+
+
+struct uPD98402_priv {
+	struct k_sonet_stats sonet_stats;/* link diagnostics */
+	unsigned char framing;		/* SONET/SDH framing */
+	int loop_mode;			/* loopback mode */
+	spinlock_t lock;
+};
+
+
+#define PRIV(dev) ((struct uPD98402_priv *) dev->phy_data)
+
+#define PUT(val,reg) dev->ops->phy_put(dev,val,uPD98402_##reg)
+#define GET(reg) dev->ops->phy_get(dev,uPD98402_##reg)
+
+
+static int fetch_stats(struct atm_dev *dev,struct sonet_stats __user *arg,int zero)
+{
+	struct sonet_stats tmp;
+ 	int error = 0;
+
+	atomic_add(GET(HECCT),&PRIV(dev)->sonet_stats.uncorr_hcs);
+	sonet_copy_stats(&PRIV(dev)->sonet_stats,&tmp);
+	if (arg) error = copy_to_user(arg,&tmp,sizeof(tmp));
+	if (zero && !error) {
+		/* unused fields are reported as -1, but we must not "adjust"
+		   them */
+		tmp.corr_hcs = tmp.tx_cells = tmp.rx_cells = 0;
+		sonet_subtract_stats(&PRIV(dev)->sonet_stats,&tmp);
+	}
+	return error ? -EFAULT : 0;
+}
+
+
+static int set_framing(struct atm_dev *dev,unsigned char framing)
+{
+	static const unsigned char sonet[] = { 1,2,3,0 };
+	static const unsigned char sdh[] = { 1,0,0,2 };
+	const char *set;
+	unsigned long flags;
+ 
+	switch (framing) {
+		case SONET_FRAME_SONET:
+			set = sonet;
+			break;
+		case SONET_FRAME_SDH:
+			set = sdh;
+			break;
+		default:
+			return -EINVAL;
+	}
+	spin_lock_irqsave(&PRIV(dev)->lock, flags);
+	PUT(set[0],C11T);
+	PUT(set[1],C12T);
+	PUT(set[2],C13T);
+	PUT((GET(MDR) & ~uPD98402_MDR_SS_MASK) | (set[3] <<
+	    uPD98402_MDR_SS_SHIFT),MDR);
+	spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
+	return 0;
+}
+
+
+static int get_sense(struct atm_dev *dev,u8 __user *arg)
+{
+	unsigned long flags;
+	unsigned char s[3];
+
+	spin_lock_irqsave(&PRIV(dev)->lock, flags);
+	s[0] = GET(C11R);
+	s[1] = GET(C12R);
+	s[2] = GET(C13R);
+	spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
+	return (put_user(s[0], arg) || put_user(s[1], arg+1) ||
+	    put_user(s[2], arg+2) || put_user(0xff, arg+3) ||
+	    put_user(0xff, arg+4) || put_user(0xff, arg+5)) ? -EFAULT : 0;
+}
+
+
+static int set_loopback(struct atm_dev *dev,int mode)
+{
+	unsigned char mode_reg;
+
+	mode_reg = GET(MDR) & ~(uPD98402_MDR_TPLP | uPD98402_MDR_ALP |
+	    uPD98402_MDR_RPLP);
+	switch (__ATM_LM_XTLOC(mode)) {
+		case __ATM_LM_NONE:
+			break;
+		case __ATM_LM_PHY:
+			mode_reg |= uPD98402_MDR_TPLP;
+			break;
+		case __ATM_LM_ATM:
+			mode_reg |= uPD98402_MDR_ALP;
+			break;
+		default:
+			return -EINVAL;
+	}
+	switch (__ATM_LM_XTRMT(mode)) {
+		case __ATM_LM_NONE:
+			break;
+		case __ATM_LM_PHY:
+			mode_reg |= uPD98402_MDR_RPLP;
+			break;
+		default:
+			return -EINVAL;
+	}
+	PUT(mode_reg,MDR);
+	PRIV(dev)->loop_mode = mode;
+	return 0;
+}
+
+
+static int uPD98402_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
+{
+	switch (cmd) {
+
+		case SONET_GETSTATZ:
+                case SONET_GETSTAT:
+			return fetch_stats(dev,arg, cmd == SONET_GETSTATZ);
+		case SONET_SETFRAMING:
+			return set_framing(dev, (int)(unsigned long)arg);
+		case SONET_GETFRAMING:
+			return put_user(PRIV(dev)->framing,(int __user *)arg) ?
+			    -EFAULT : 0;
+		case SONET_GETFRSENSE:
+			return get_sense(dev,arg);
+		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_PHY | ATM_LM_LOC_ATM |
+			    ATM_LM_RMT_PHY,(int __user *)arg) ? -EFAULT : 0;
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+
+#define ADD_LIMITED(s,v) \
+    { atomic_add(GET(v),&PRIV(dev)->sonet_stats.s); \
+    if (atomic_read(&PRIV(dev)->sonet_stats.s) < 0) \
+	atomic_set(&PRIV(dev)->sonet_stats.s,INT_MAX); }
+
+
+static void stat_event(struct atm_dev *dev)
+{
+	unsigned char events;
+
+	events = GET(PCR);
+	if (events & uPD98402_PFM_PFEB) ADD_LIMITED(path_febe,PFECB);
+	if (events & uPD98402_PFM_LFEB) ADD_LIMITED(line_febe,LECCT);
+	if (events & uPD98402_PFM_B3E) ADD_LIMITED(path_bip,B3ECT);
+	if (events & uPD98402_PFM_B2E) ADD_LIMITED(line_bip,B2ECT);
+	if (events & uPD98402_PFM_B1E) ADD_LIMITED(section_bip,B1ECT);
+}
+
+
+#undef ADD_LIMITED
+
+
+static void uPD98402_int(struct atm_dev *dev)
+{
+	static unsigned long silence = 0;
+	unsigned char reason;
+
+	while ((reason = GET(PICR))) {
+		if (reason & uPD98402_INT_LOS)
+			printk(KERN_NOTICE "%s(itf %d): signal lost\n",
+			    dev->type,dev->number);
+		if (reason & uPD98402_INT_PFM) stat_event(dev);
+		if (reason & uPD98402_INT_PCO) {
+			(void) GET(PCOCR); /* clear interrupt cause */
+			atomic_add(GET(HECCT),
+			    &PRIV(dev)->sonet_stats.uncorr_hcs);
+		}
+		if ((reason & uPD98402_INT_RFO) && 
+		    (time_after(jiffies, silence) || silence == 0)) {
+			printk(KERN_WARNING "%s(itf %d): uPD98402 receive "
+			    "FIFO overflow\n",dev->type,dev->number);
+			silence = (jiffies+HZ/2)|1;
+		}
+	}
+}
+
+
+static int uPD98402_start(struct atm_dev *dev)
+{
+	DPRINTK("phy_start\n");
+	if (!(dev->phy_data = kmalloc(sizeof(struct uPD98402_priv),GFP_KERNEL)))
+		return -ENOMEM;
+	spin_lock_init(&PRIV(dev)->lock);
+	memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats));
+	(void) GET(PCR); /* clear performance events */
+	PUT(uPD98402_PFM_FJ,PCMR); /* ignore frequency adj */
+	(void) GET(PCOCR); /* clear overflows */
+	PUT(~uPD98402_PCO_HECC,PCOMR);
+	(void) GET(PICR); /* clear interrupts */
+	PUT(~(uPD98402_INT_PFM | uPD98402_INT_ALM | uPD98402_INT_RFO |
+	  uPD98402_INT_LOS),PIMR); /* enable them */
+	(void) fetch_stats(dev,NULL,1); /* clear kernel counters */
+	atomic_set(&PRIV(dev)->sonet_stats.corr_hcs,-1);
+	atomic_set(&PRIV(dev)->sonet_stats.tx_cells,-1);
+	atomic_set(&PRIV(dev)->sonet_stats.rx_cells,-1);
+	return 0;
+}
+
+
+static int uPD98402_stop(struct atm_dev *dev)
+{
+	/* let SAR driver worry about stopping interrupts */
+	kfree(PRIV(dev));
+	return 0;
+}
+
+
+static const struct atmphy_ops uPD98402_ops = {
+	.start		= uPD98402_start,
+	.ioctl		= uPD98402_ioctl,
+	.interrupt	= uPD98402_int,
+	.stop		= uPD98402_stop,
+};
+
+
+int uPD98402_init(struct atm_dev *dev)
+{
+DPRINTK("phy_init\n");
+	dev->phy = &uPD98402_ops;
+	return 0;
+}
+
+
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(uPD98402_init);
+
+static __init int uPD98402_module_init(void)
+{
+	return 0;
+}
+module_init(uPD98402_module_init);
+/* module_exit not defined so not unloadable */