1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * drivers/atm/suni.c - S/UNI PHY driver 4 * 5 * Supports the following: 6 * PMC PM5346 S/UNI LITE 7 * PMC PM5350 S/UNI 155 ULTRA 8 * PMC PM5355 S/UNI 622 9 */ 10 11 /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ 12 13 #include <linux/module.h> 14 #include <linux/jiffies.h> 15 #include <linux/kernel.h> 16 #include <linux/mm.h> 17 #include <linux/errno.h> 18 #include <linux/atmdev.h> 19 #include <linux/sonet.h> 20 #include <linux/delay.h> 21 #include <linux/timer.h> 22 #include <linux/init.h> 23 #include <linux/capability.h> 24 #include <linux/slab.h> 25 #include <asm/param.h> 26 #include <linux/uaccess.h> 27 #include <linux/atomic.h> 28 29 #include "suni.h" 30 31 32 #if 0 33 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) 34 #else 35 #define DPRINTK(format,args...) 36 #endif 37 38 #define PRIV(dev) ((struct suni_priv *) dev->phy_data) 39 40 #define PUT(val,reg) dev->ops->phy_put(dev,val,SUNI_##reg) 41 #define GET(reg) dev->ops->phy_get(dev,SUNI_##reg) 42 #define REG_CHANGE(mask,shift,value,reg) \ 43 PUT((GET(reg) & ~(mask)) | ((value) << (shift)),reg) 44 45 46 static struct timer_list poll_timer; 47 static struct suni_priv *sunis = NULL; 48 static DEFINE_SPINLOCK(sunis_lock); 49 50 51 #define ADD_LIMITED(s,v) \ 52 atomic_add((v),&stats->s); \ 53 if (atomic_read(&stats->s) < 0) atomic_set(&stats->s,INT_MAX); 54 55 56 static void suni_hz(struct timer_list *timer) 57 { 58 struct suni_priv *walk; 59 struct atm_dev *dev; 60 struct k_sonet_stats *stats; 61 62 for (walk = sunis; walk; walk = walk->next) { 63 dev = walk->dev; 64 stats = &walk->sonet_stats; 65 PUT(0,MRI); /* latch counters */ 66 udelay(1); 67 ADD_LIMITED(section_bip,(GET(RSOP_SBL) & 0xff) | 68 ((GET(RSOP_SBM) & 0xff) << 8)); 69 ADD_LIMITED(line_bip,(GET(RLOP_LBL) & 0xff) | 70 ((GET(RLOP_LB) & 0xff) << 8) | 71 ((GET(RLOP_LBM) & 0xf) << 16)); 72 ADD_LIMITED(path_bip,(GET(RPOP_PBL) & 0xff) | 73 ((GET(RPOP_PBM) & 0xff) << 8)); 74 ADD_LIMITED(line_febe,(GET(RLOP_LFL) & 0xff) | 75 ((GET(RLOP_LF) & 0xff) << 8) | 76 ((GET(RLOP_LFM) & 0xf) << 16)); 77 ADD_LIMITED(path_febe,(GET(RPOP_PFL) & 0xff) | 78 ((GET(RPOP_PFM) & 0xff) << 8)); 79 ADD_LIMITED(corr_hcs,GET(RACP_CHEC) & 0xff); 80 ADD_LIMITED(uncorr_hcs,GET(RACP_UHEC) & 0xff); 81 ADD_LIMITED(rx_cells,(GET(RACP_RCCL) & 0xff) | 82 ((GET(RACP_RCC) & 0xff) << 8) | 83 ((GET(RACP_RCCM) & 7) << 16)); 84 ADD_LIMITED(tx_cells,(GET(TACP_TCCL) & 0xff) | 85 ((GET(TACP_TCC) & 0xff) << 8) | 86 ((GET(TACP_TCCM) & 7) << 16)); 87 } 88 if (timer) mod_timer(&poll_timer,jiffies+HZ); 89 } 90 91 92 #undef ADD_LIMITED 93 94 95 static int fetch_stats(struct atm_dev *dev,struct sonet_stats __user *arg,int zero) 96 { 97 struct sonet_stats tmp; 98 int error = 0; 99 100 sonet_copy_stats(&PRIV(dev)->sonet_stats,&tmp); 101 if (arg) error = copy_to_user(arg,&tmp,sizeof(tmp)); 102 if (zero && !error) sonet_subtract_stats(&PRIV(dev)->sonet_stats,&tmp); 103 return error ? -EFAULT : 0; 104 } 105 106 107 #define HANDLE_FLAG(flag,reg,bit) \ 108 if (todo & flag) { \ 109 if (set) PUT(GET(reg) | bit,reg); \ 110 else PUT(GET(reg) & ~bit,reg); \ 111 todo &= ~flag; \ 112 } 113 114 115 static int change_diag(struct atm_dev *dev,void __user *arg,int set) 116 { 117 int todo; 118 119 if (get_user(todo,(int __user *)arg)) return -EFAULT; 120 HANDLE_FLAG(SONET_INS_SBIP,TSOP_DIAG,SUNI_TSOP_DIAG_DBIP8); 121 HANDLE_FLAG(SONET_INS_LBIP,TLOP_DIAG,SUNI_TLOP_DIAG_DBIP); 122 HANDLE_FLAG(SONET_INS_PBIP,TPOP_CD,SUNI_TPOP_DIAG_DB3); 123 HANDLE_FLAG(SONET_INS_FRAME,RSOP_CIE,SUNI_RSOP_CIE_FOOF); 124 HANDLE_FLAG(SONET_INS_LAIS,TSOP_CTRL,SUNI_TSOP_CTRL_LAIS); 125 HANDLE_FLAG(SONET_INS_PAIS,TPOP_CD,SUNI_TPOP_DIAG_PAIS); 126 HANDLE_FLAG(SONET_INS_LOS,TSOP_DIAG,SUNI_TSOP_DIAG_DLOS); 127 HANDLE_FLAG(SONET_INS_HCS,TACP_CS,SUNI_TACP_CS_DHCS); 128 return put_user(todo,(int __user *)arg) ? -EFAULT : 0; 129 } 130 131 132 #undef HANDLE_FLAG 133 134 135 static int get_diag(struct atm_dev *dev,void __user *arg) 136 { 137 int set; 138 139 set = 0; 140 if (GET(TSOP_DIAG) & SUNI_TSOP_DIAG_DBIP8) set |= SONET_INS_SBIP; 141 if (GET(TLOP_DIAG) & SUNI_TLOP_DIAG_DBIP) set |= SONET_INS_LBIP; 142 if (GET(TPOP_CD) & SUNI_TPOP_DIAG_DB3) set |= SONET_INS_PBIP; 143 /* SONET_INS_FRAME is one-shot only */ 144 if (GET(TSOP_CTRL) & SUNI_TSOP_CTRL_LAIS) set |= SONET_INS_LAIS; 145 if (GET(TPOP_CD) & SUNI_TPOP_DIAG_PAIS) set |= SONET_INS_PAIS; 146 if (GET(TSOP_DIAG) & SUNI_TSOP_DIAG_DLOS) set |= SONET_INS_LOS; 147 if (GET(TACP_CS) & SUNI_TACP_CS_DHCS) set |= SONET_INS_HCS; 148 return put_user(set,(int __user *)arg) ? -EFAULT : 0; 149 } 150 151 152 static int set_loopback(struct atm_dev *dev,int mode) 153 { 154 unsigned char control; 155 int reg, dle, lle; 156 157 if (PRIV(dev)->type == SUNI_MRI_TYPE_PM5355) { 158 reg = SUNI_MCM; 159 dle = SUNI_MCM_DLE; 160 lle = SUNI_MCM_LLE; 161 } else { 162 reg = SUNI_MCT; 163 dle = SUNI_MCT_DLE; 164 lle = SUNI_MCT_LLE; 165 } 166 167 control = dev->ops->phy_get(dev, reg) & ~(dle | lle); 168 switch (mode) { 169 case ATM_LM_NONE: 170 break; 171 case ATM_LM_LOC_PHY: 172 control |= dle; 173 break; 174 case ATM_LM_RMT_PHY: 175 control |= lle; 176 break; 177 default: 178 return -EINVAL; 179 } 180 dev->ops->phy_put(dev, control, reg); 181 PRIV(dev)->loop_mode = mode; 182 return 0; 183 } 184 185 /* 186 * SONET vs. SDH Configuration 187 * 188 * Z0INS (register 0x06): 0 for SONET, 1 for SDH 189 * ENSS (register 0x3D): 0 for SONET, 1 for SDH 190 * LEN16 (register 0x28): 0 for SONET, 1 for SDH (n/a for S/UNI 155 QUAD) 191 * LEN16 (register 0x50): 0 for SONET, 1 for SDH (n/a for S/UNI 155 QUAD) 192 * S[1:0] (register 0x46): 00 for SONET, 10 for SDH 193 */ 194 195 static int set_sonet(struct atm_dev *dev) 196 { 197 if (PRIV(dev)->type == SUNI_MRI_TYPE_PM5355) { 198 PUT(GET(RPOP_RC) & ~SUNI_RPOP_RC_ENSS, RPOP_RC); 199 PUT(GET(SSTB_CTRL) & ~SUNI_SSTB_CTRL_LEN16, SSTB_CTRL); 200 PUT(GET(SPTB_CTRL) & ~SUNI_SPTB_CTRL_LEN16, SPTB_CTRL); 201 } 202 203 REG_CHANGE(SUNI_TPOP_APM_S, SUNI_TPOP_APM_S_SHIFT, 204 SUNI_TPOP_S_SONET, TPOP_APM); 205 206 return 0; 207 } 208 209 static int set_sdh(struct atm_dev *dev) 210 { 211 if (PRIV(dev)->type == SUNI_MRI_TYPE_PM5355) { 212 PUT(GET(RPOP_RC) | SUNI_RPOP_RC_ENSS, RPOP_RC); 213 PUT(GET(SSTB_CTRL) | SUNI_SSTB_CTRL_LEN16, SSTB_CTRL); 214 PUT(GET(SPTB_CTRL) | SUNI_SPTB_CTRL_LEN16, SPTB_CTRL); 215 } 216 217 REG_CHANGE(SUNI_TPOP_APM_S, SUNI_TPOP_APM_S_SHIFT, 218 SUNI_TPOP_S_SDH, TPOP_APM); 219 220 return 0; 221 } 222 223 224 static int get_framing(struct atm_dev *dev, void __user *arg) 225 { 226 int framing; 227 unsigned char s; 228 229 230 s = (GET(TPOP_APM) & SUNI_TPOP_APM_S) >> SUNI_TPOP_APM_S_SHIFT; 231 if (s == SUNI_TPOP_S_SONET) 232 framing = SONET_FRAME_SONET; 233 else 234 framing = SONET_FRAME_SDH; 235 236 return put_user(framing, (int __user *) arg) ? -EFAULT : 0; 237 } 238 239 static int set_framing(struct atm_dev *dev, void __user *arg) 240 { 241 int mode; 242 243 if (get_user(mode, (int __user *) arg)) 244 return -EFAULT; 245 246 if (mode == SONET_FRAME_SONET) 247 return set_sonet(dev); 248 else if (mode == SONET_FRAME_SDH) 249 return set_sdh(dev); 250 251 return -EINVAL; 252 } 253 254 255 static int suni_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg) 256 { 257 switch (cmd) { 258 case SONET_GETSTATZ: 259 case SONET_GETSTAT: 260 return fetch_stats(dev, arg, cmd == SONET_GETSTATZ); 261 case SONET_SETDIAG: 262 return change_diag(dev,arg,1); 263 case SONET_CLRDIAG: 264 return change_diag(dev,arg,0); 265 case SONET_GETDIAG: 266 return get_diag(dev,arg); 267 case SONET_SETFRAMING: 268 if (!capable(CAP_NET_ADMIN)) 269 return -EPERM; 270 return set_framing(dev, arg); 271 case SONET_GETFRAMING: 272 return get_framing(dev, arg); 273 case SONET_GETFRSENSE: 274 return -EINVAL; 275 case ATM_SETLOOP: 276 if (!capable(CAP_NET_ADMIN)) 277 return -EPERM; 278 return set_loopback(dev,(int)(unsigned long)arg); 279 case ATM_GETLOOP: 280 return put_user(PRIV(dev)->loop_mode,(int __user *)arg) ? 281 -EFAULT : 0; 282 case ATM_QUERYLOOP: 283 return put_user(ATM_LM_LOC_PHY | ATM_LM_RMT_PHY, 284 (int __user *) arg) ? -EFAULT : 0; 285 default: 286 return -ENOIOCTLCMD; 287 } 288 } 289 290 291 static void poll_los(struct atm_dev *dev) 292 { 293 atm_dev_signal_change(dev, 294 GET(RSOP_SIS) & SUNI_RSOP_SIS_LOSV ? 295 ATM_PHY_SIG_LOST : ATM_PHY_SIG_FOUND); 296 } 297 298 299 static void suni_int(struct atm_dev *dev) 300 { 301 poll_los(dev); 302 printk(KERN_NOTICE "%s(itf %d): signal %s\n",dev->type,dev->number, 303 dev->signal == ATM_PHY_SIG_LOST ? "lost" : "detected again"); 304 } 305 306 307 static int suni_start(struct atm_dev *dev) 308 { 309 unsigned long flags; 310 int first; 311 312 spin_lock_irqsave(&sunis_lock,flags); 313 first = !sunis; 314 PRIV(dev)->next = sunis; 315 sunis = PRIV(dev); 316 spin_unlock_irqrestore(&sunis_lock,flags); 317 memset(&PRIV(dev)->sonet_stats,0,sizeof(struct k_sonet_stats)); 318 PUT(GET(RSOP_CIE) | SUNI_RSOP_CIE_LOSE,RSOP_CIE); 319 /* interrupt on loss of signal */ 320 poll_los(dev); /* ... and clear SUNI interrupts */ 321 if (dev->signal == ATM_PHY_SIG_LOST) 322 printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type, 323 dev->number); 324 PRIV(dev)->loop_mode = ATM_LM_NONE; 325 suni_hz(NULL); /* clear SUNI counters */ 326 (void) fetch_stats(dev,NULL,1); /* clear kernel counters */ 327 if (first) { 328 timer_setup(&poll_timer, suni_hz, 0); 329 poll_timer.expires = jiffies+HZ; 330 #if 0 331 printk(KERN_DEBUG "[u] p=0x%lx,n=0x%lx\n",(unsigned long) poll_timer.list.prev, 332 (unsigned long) poll_timer.list.next); 333 #endif 334 add_timer(&poll_timer); 335 } 336 return 0; 337 } 338 339 340 static int suni_stop(struct atm_dev *dev) 341 { 342 struct suni_priv **walk; 343 unsigned long flags; 344 345 /* let SAR driver worry about stopping interrupts */ 346 spin_lock_irqsave(&sunis_lock,flags); 347 for (walk = &sunis; *walk != PRIV(dev); 348 walk = &PRIV((*walk)->dev)->next); 349 *walk = PRIV((*walk)->dev)->next; 350 if (!sunis) del_timer_sync(&poll_timer); 351 spin_unlock_irqrestore(&sunis_lock,flags); 352 kfree(PRIV(dev)); 353 354 return 0; 355 } 356 357 358 static const struct atmphy_ops suni_ops = { 359 .start = suni_start, 360 .ioctl = suni_ioctl, 361 .interrupt = suni_int, 362 .stop = suni_stop, 363 }; 364 365 366 int suni_init(struct atm_dev *dev) 367 { 368 unsigned char mri; 369 370 if (!(dev->phy_data = kmalloc(sizeof(struct suni_priv),GFP_KERNEL))) 371 return -ENOMEM; 372 PRIV(dev)->dev = dev; 373 374 mri = GET(MRI); /* reset SUNI */ 375 PRIV(dev)->type = (mri & SUNI_MRI_TYPE) >> SUNI_MRI_TYPE_SHIFT; 376 PUT(mri | SUNI_MRI_RESET,MRI); 377 PUT(mri,MRI); 378 PUT((GET(MT) & SUNI_MT_DS27_53),MT); /* disable all tests */ 379 set_sonet(dev); 380 REG_CHANGE(SUNI_TACP_IUCHP_CLP,0,SUNI_TACP_IUCHP_CLP, 381 TACP_IUCHP); /* idle cells */ 382 PUT(SUNI_IDLE_PATTERN,TACP_IUCPOP); 383 dev->phy = &suni_ops; 384 385 return 0; 386 } 387 388 EXPORT_SYMBOL(suni_init); 389 390 MODULE_DESCRIPTION("S/UNI PHY driver"); 391 MODULE_LICENSE("GPL"); 392