1 /* drivers/atm/uPD98402.c - NEC uPD98402 (PHY) declarations */
2 
3 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
4 
5 
6 #include <linux/module.h>
7 #include <linux/mm.h>
8 #include <linux/errno.h>
9 #include <linux/atmdev.h>
10 #include <linux/sonet.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13 #include <linux/uaccess.h>
14 #include <linux/atomic.h>
15 
16 #include "uPD98402.h"
17 
18 
19 #if 0
20 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
21 #else
22 #define DPRINTK(format,args...)
23 #endif
24 
25 
26 struct uPD98402_priv {
27 	struct k_sonet_stats sonet_stats;/* link diagnostics */
28 	unsigned char framing;		/* SONET/SDH framing */
29 	int loop_mode;			/* loopback mode */
30 	spinlock_t lock;
31 };
32 
33 
34 #define PRIV(dev) ((struct uPD98402_priv *) dev->phy_data)
35 
36 #define PUT(val,reg) dev->ops->phy_put(dev,val,uPD98402_##reg)
37 #define GET(reg) dev->ops->phy_get(dev,uPD98402_##reg)
38 
39 
fetch_stats(struct atm_dev * dev,struct sonet_stats __user * arg,int zero)40 static int fetch_stats(struct atm_dev *dev,struct sonet_stats __user *arg,int zero)
41 {
42 	struct sonet_stats tmp;
43  	int error = 0;
44 
45 	atomic_add(GET(HECCT),&PRIV(dev)->sonet_stats.uncorr_hcs);
46 	sonet_copy_stats(&PRIV(dev)->sonet_stats,&tmp);
47 	if (arg) error = copy_to_user(arg,&tmp,sizeof(tmp));
48 	if (zero && !error) {
49 		/* unused fields are reported as -1, but we must not "adjust"
50 		   them */
51 		tmp.corr_hcs = tmp.tx_cells = tmp.rx_cells = 0;
52 		sonet_subtract_stats(&PRIV(dev)->sonet_stats,&tmp);
53 	}
54 	return error ? -EFAULT : 0;
55 }
56 
57 
set_framing(struct atm_dev * dev,unsigned char framing)58 static int set_framing(struct atm_dev *dev,unsigned char framing)
59 {
60 	static const unsigned char sonet[] = { 1,2,3,0 };
61 	static const unsigned char sdh[] = { 1,0,0,2 };
62 	const char *set;
63 	unsigned long flags;
64 
65 	switch (framing) {
66 		case SONET_FRAME_SONET:
67 			set = sonet;
68 			break;
69 		case SONET_FRAME_SDH:
70 			set = sdh;
71 			break;
72 		default:
73 			return -EINVAL;
74 	}
75 	spin_lock_irqsave(&PRIV(dev)->lock, flags);
76 	PUT(set[0],C11T);
77 	PUT(set[1],C12T);
78 	PUT(set[2],C13T);
79 	PUT((GET(MDR) & ~uPD98402_MDR_SS_MASK) | (set[3] <<
80 	    uPD98402_MDR_SS_SHIFT),MDR);
81 	spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
82 	return 0;
83 }
84 
85 
get_sense(struct atm_dev * dev,u8 __user * arg)86 static int get_sense(struct atm_dev *dev,u8 __user *arg)
87 {
88 	unsigned long flags;
89 	unsigned char s[3];
90 
91 	spin_lock_irqsave(&PRIV(dev)->lock, flags);
92 	s[0] = GET(C11R);
93 	s[1] = GET(C12R);
94 	s[2] = GET(C13R);
95 	spin_unlock_irqrestore(&PRIV(dev)->lock, flags);
96 	return (put_user(s[0], arg) || put_user(s[1], arg+1) ||
97 	    put_user(s[2], arg+2) || put_user(0xff, arg+3) ||
98 	    put_user(0xff, arg+4) || put_user(0xff, arg+5)) ? -EFAULT : 0;
99 }
100 
101 
set_loopback(struct atm_dev * dev,int mode)102 static int set_loopback(struct atm_dev *dev,int mode)
103 {
104 	unsigned char mode_reg;
105 
106 	mode_reg = GET(MDR) & ~(uPD98402_MDR_TPLP | uPD98402_MDR_ALP |
107 	    uPD98402_MDR_RPLP);
108 	switch (__ATM_LM_XTLOC(mode)) {
109 		case __ATM_LM_NONE:
110 			break;
111 		case __ATM_LM_PHY:
112 			mode_reg |= uPD98402_MDR_TPLP;
113 			break;
114 		case __ATM_LM_ATM:
115 			mode_reg |= uPD98402_MDR_ALP;
116 			break;
117 		default:
118 			return -EINVAL;
119 	}
120 	switch (__ATM_LM_XTRMT(mode)) {
121 		case __ATM_LM_NONE:
122 			break;
123 		case __ATM_LM_PHY:
124 			mode_reg |= uPD98402_MDR_RPLP;
125 			break;
126 		default:
127 			return -EINVAL;
128 	}
129 	PUT(mode_reg,MDR);
130 	PRIV(dev)->loop_mode = mode;
131 	return 0;
132 }
133 
134 
uPD98402_ioctl(struct atm_dev * dev,unsigned int cmd,void __user * arg)135 static int uPD98402_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
136 {
137 	switch (cmd) {
138 
139 		case SONET_GETSTATZ:
140                 case SONET_GETSTAT:
141 			return fetch_stats(dev,arg, cmd == SONET_GETSTATZ);
142 		case SONET_SETFRAMING:
143 			return set_framing(dev, (int)(unsigned long)arg);
144 		case SONET_GETFRAMING:
145 			return put_user(PRIV(dev)->framing,(int __user *)arg) ?
146 			    -EFAULT : 0;
147 		case SONET_GETFRSENSE:
148 			return get_sense(dev,arg);
149 		case ATM_SETLOOP:
150 			return set_loopback(dev, (int)(unsigned long)arg);
151 		case ATM_GETLOOP:
152 			return put_user(PRIV(dev)->loop_mode,(int __user *)arg) ?
153 			    -EFAULT : 0;
154 		case ATM_QUERYLOOP:
155 			return put_user(ATM_LM_LOC_PHY | ATM_LM_LOC_ATM |
156 			    ATM_LM_RMT_PHY,(int __user *)arg) ? -EFAULT : 0;
157 		default:
158 			return -ENOIOCTLCMD;
159 	}
160 }
161 
162 
163 #define ADD_LIMITED(s,v) \
164     { atomic_add(GET(v),&PRIV(dev)->sonet_stats.s); \
165     if (atomic_read(&PRIV(dev)->sonet_stats.s) < 0) \
166 	atomic_set(&PRIV(dev)->sonet_stats.s,INT_MAX); }
167 
168 
stat_event(struct atm_dev * dev)169 static void stat_event(struct atm_dev *dev)
170 {
171 	unsigned char events;
172 
173 	events = GET(PCR);
174 	if (events & uPD98402_PFM_PFEB) ADD_LIMITED(path_febe,PFECB);
175 	if (events & uPD98402_PFM_LFEB) ADD_LIMITED(line_febe,LECCT);
176 	if (events & uPD98402_PFM_B3E) ADD_LIMITED(path_bip,B3ECT);
177 	if (events & uPD98402_PFM_B2E) ADD_LIMITED(line_bip,B2ECT);
178 	if (events & uPD98402_PFM_B1E) ADD_LIMITED(section_bip,B1ECT);
179 }
180 
181 
182 #undef ADD_LIMITED
183 
184 
uPD98402_int(struct atm_dev * dev)185 static void uPD98402_int(struct atm_dev *dev)
186 {
187 	static unsigned long silence = 0;
188 	unsigned char reason;
189 
190 	while ((reason = GET(PICR))) {
191 		if (reason & uPD98402_INT_LOS)
192 			printk(KERN_NOTICE "%s(itf %d): signal lost\n",
193 			    dev->type,dev->number);
194 		if (reason & uPD98402_INT_PFM) stat_event(dev);
195 		if (reason & uPD98402_INT_PCO) {
196 			(void) GET(PCOCR); /* clear interrupt cause */
197 			atomic_add(GET(HECCT),
198 			    &PRIV(dev)->sonet_stats.uncorr_hcs);
199 		}
200 		if ((reason & uPD98402_INT_RFO) &&
201 		    (time_after(jiffies, silence) || silence == 0)) {
202 			printk(KERN_WARNING "%s(itf %d): uPD98402 receive "
203 			    "FIFO overflow\n",dev->type,dev->number);
204 			silence = (jiffies+HZ/2)|1;
205 		}
206 	}
207 }
208 
209 
uPD98402_start(struct atm_dev * dev)210 static int uPD98402_start(struct atm_dev *dev)
211 {
212 	DPRINTK("phy_start\n");
213 	if (!(dev->dev_data = kmalloc(sizeof(struct uPD98402_priv),GFP_KERNEL)))
214 		return -ENOMEM;
215 	spin_lock_init(&PRIV(dev)->lock);
216 	memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats));
217 	(void) GET(PCR); /* clear performance events */
218 	PUT(uPD98402_PFM_FJ,PCMR); /* ignore frequency adj */
219 	(void) GET(PCOCR); /* clear overflows */
220 	PUT(~uPD98402_PCO_HECC,PCOMR);
221 	(void) GET(PICR); /* clear interrupts */
222 	PUT(~(uPD98402_INT_PFM | uPD98402_INT_ALM | uPD98402_INT_RFO |
223 	  uPD98402_INT_LOS),PIMR); /* enable them */
224 	(void) fetch_stats(dev,NULL,1); /* clear kernel counters */
225 	atomic_set(&PRIV(dev)->sonet_stats.corr_hcs,-1);
226 	atomic_set(&PRIV(dev)->sonet_stats.tx_cells,-1);
227 	atomic_set(&PRIV(dev)->sonet_stats.rx_cells,-1);
228 	return 0;
229 }
230 
231 
uPD98402_stop(struct atm_dev * dev)232 static int uPD98402_stop(struct atm_dev *dev)
233 {
234 	/* let SAR driver worry about stopping interrupts */
235 	kfree(PRIV(dev));
236 	return 0;
237 }
238 
239 
240 static const struct atmphy_ops uPD98402_ops = {
241 	.start		= uPD98402_start,
242 	.ioctl		= uPD98402_ioctl,
243 	.interrupt	= uPD98402_int,
244 	.stop		= uPD98402_stop,
245 };
246 
247 
uPD98402_init(struct atm_dev * dev)248 int uPD98402_init(struct atm_dev *dev)
249 {
250 DPRINTK("phy_init\n");
251 	dev->phy = &uPD98402_ops;
252 	return 0;
253 }
254 
255 
256 MODULE_LICENSE("GPL");
257 
258 EXPORT_SYMBOL(uPD98402_init);
259 
uPD98402_module_init(void)260 static __init int uPD98402_module_init(void)
261 {
262 	return 0;
263 }
264 module_init(uPD98402_module_init);
265 /* module_exit not defined so not unloadable */
266