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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 | // SPDX-License-Identifier: GPL-2.0-only /* drivers/atm/idt77105.c - IDT77105 (PHY) driver */ /* Written 1999 by Greg Banks, NEC Australia <gnb@linuxfan.com>. Based on suni.c */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/errno.h> #include <linux/atmdev.h> #include <linux/sonet.h> #include <linux/delay.h> #include <linux/timer.h> #include <linux/init.h> #include <linux/capability.h> #include <linux/atm_idt77105.h> #include <linux/spinlock.h> #include <linux/slab.h> #include <asm/param.h> #include <linux/uaccess.h> #include "idt77105.h" #undef GENERAL_DEBUG #ifdef GENERAL_DEBUG #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args) #else #define DPRINTK(format,args...) #endif struct idt77105_priv { struct idt77105_stats stats; /* link diagnostics */ struct atm_dev *dev; /* device back-pointer */ struct idt77105_priv *next; int loop_mode; unsigned char old_mcr; /* storage of MCR reg while signal lost */ }; static DEFINE_SPINLOCK(idt77105_priv_lock); #define PRIV(dev) ((struct idt77105_priv *) dev->phy_data) #define PUT(val,reg) dev->ops->phy_put(dev,val,IDT77105_##reg) #define GET(reg) dev->ops->phy_get(dev,IDT77105_##reg) static void idt77105_stats_timer_func(struct timer_list *); static void idt77105_restart_timer_func(struct timer_list *); static DEFINE_TIMER(stats_timer, idt77105_stats_timer_func); static DEFINE_TIMER(restart_timer, idt77105_restart_timer_func); static int start_timer = 1; static struct idt77105_priv *idt77105_all = NULL; /* * Retrieve the value of one of the IDT77105's counters. * `counter' is one of the IDT77105_CTRSEL_* constants. */ static u16 get_counter(struct atm_dev *dev, int counter) { u16 val; /* write the counter bit into PHY register 6 */ PUT(counter, CTRSEL); /* read the low 8 bits from register 4 */ val = GET(CTRLO); /* read the high 8 bits from register 5 */ val |= GET(CTRHI)<<8; return val; } /* * Timer function called every second to gather statistics * from the 77105. This is done because the h/w registers * will overflow if not read at least once per second. The * kernel's stats are much higher precision. Also, having * a separate copy of the stats allows implementation of * an ioctl which gathers the stats *without* zero'ing them. */ static void idt77105_stats_timer_func(struct timer_list *unused) { struct idt77105_priv *walk; struct atm_dev *dev; struct idt77105_stats *stats; DPRINTK("IDT77105 gathering statistics\n"); for (walk = idt77105_all; walk; walk = walk->next) { dev = walk->dev; stats = &walk->stats; stats->symbol_errors += get_counter(dev, IDT77105_CTRSEL_SEC); stats->tx_cells += get_counter(dev, IDT77105_CTRSEL_TCC); stats->rx_cells += get_counter(dev, IDT77105_CTRSEL_RCC); stats->rx_hec_errors += get_counter(dev, IDT77105_CTRSEL_RHEC); } if (!start_timer) mod_timer(&stats_timer,jiffies+IDT77105_STATS_TIMER_PERIOD); } /* * A separate timer func which handles restarting PHY chips which * have had the cable re-inserted after being pulled out. This is * done by polling the Good Signal Bit in the Interrupt Status * register every 5 seconds. The other technique (checking Good * Signal Bit in the interrupt handler) cannot be used because PHY * interrupts need to be disabled when the cable is pulled out * to avoid lots of spurious cell error interrupts. */ static void idt77105_restart_timer_func(struct timer_list *unused) { struct idt77105_priv *walk; struct atm_dev *dev; unsigned char istat; DPRINTK("IDT77105 checking for cable re-insertion\n"); for (walk = idt77105_all; walk; walk = walk->next) { dev = walk->dev; if (dev->signal != ATM_PHY_SIG_LOST) continue; istat = GET(ISTAT); /* side effect: clears all interrupt status bits */ if (istat & IDT77105_ISTAT_GOODSIG) { /* Found signal again */ atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND); printk(KERN_NOTICE "%s(itf %d): signal detected again\n", dev->type,dev->number); /* flush the receive FIFO */ PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG); /* re-enable interrupts */ PUT( walk->old_mcr ,MCR); } } if (!start_timer) mod_timer(&restart_timer,jiffies+IDT77105_RESTART_TIMER_PERIOD); } static int fetch_stats(struct atm_dev *dev,struct idt77105_stats __user *arg,int zero) { unsigned long flags; struct idt77105_stats stats; spin_lock_irqsave(&idt77105_priv_lock, flags); memcpy(&stats, &PRIV(dev)->stats, sizeof(struct idt77105_stats)); if (zero) memset(&PRIV(dev)->stats, 0, sizeof(struct idt77105_stats)); spin_unlock_irqrestore(&idt77105_priv_lock, flags); if (arg == NULL) return 0; return copy_to_user(arg, &stats, sizeof(struct idt77105_stats)) ? -EFAULT : 0; } static int set_loopback(struct atm_dev *dev,int mode) { int diag; diag = GET(DIAG) & ~IDT77105_DIAG_LCMASK; switch (mode) { case ATM_LM_NONE: break; case ATM_LM_LOC_ATM: diag |= IDT77105_DIAG_LC_PHY_LOOPBACK; break; case ATM_LM_RMT_ATM: diag |= IDT77105_DIAG_LC_LINE_LOOPBACK; break; default: return -EINVAL; } PUT(diag,DIAG); printk(KERN_NOTICE "%s(%d) Loopback mode is: %s\n", dev->type, dev->number, (mode == ATM_LM_NONE ? "NONE" : (mode == ATM_LM_LOC_ATM ? "DIAG (local)" : (mode == IDT77105_DIAG_LC_LINE_LOOPBACK ? "LOOP (remote)" : "unknown"))) ); PRIV(dev)->loop_mode = mode; return 0; } static int idt77105_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg) { printk(KERN_NOTICE "%s(%d) idt77105_ioctl() called\n",dev->type,dev->number); switch (cmd) { case IDT77105_GETSTATZ: if (!capable(CAP_NET_ADMIN)) return -EPERM; fallthrough; case IDT77105_GETSTAT: return fetch_stats(dev, arg, cmd == IDT77105_GETSTATZ); 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_ATM | ATM_LM_RMT_ATM, (int __user *) arg) ? -EFAULT : 0; default: return -ENOIOCTLCMD; } } static void idt77105_int(struct atm_dev *dev) { unsigned char istat; istat = GET(ISTAT); /* side effect: clears all interrupt status bits */ DPRINTK("IDT77105 generated an interrupt, istat=%02x\n", (unsigned)istat); if (istat & IDT77105_ISTAT_RSCC) { /* Rx Signal Condition Change - line went up or down */ if (istat & IDT77105_ISTAT_GOODSIG) { /* signal detected again */ /* This should not happen (restart timer does it) but JIC */ atm_dev_signal_change(dev, ATM_PHY_SIG_FOUND); } else { /* signal lost */ /* * Disable interrupts and stop all transmission and * reception - the restart timer will restore these. */ PRIV(dev)->old_mcr = GET(MCR); PUT( (PRIV(dev)->old_mcr| IDT77105_MCR_DREC| IDT77105_MCR_DRIC| IDT77105_MCR_HALTTX ) & ~IDT77105_MCR_EIP, MCR); atm_dev_signal_change(dev, ATM_PHY_SIG_LOST); printk(KERN_NOTICE "%s(itf %d): signal lost\n", dev->type,dev->number); } } if (istat & IDT77105_ISTAT_RFO) { /* Rx FIFO Overrun -- perform a FIFO flush */ PUT( GET(DIAG) | IDT77105_DIAG_RFLUSH, DIAG); printk(KERN_NOTICE "%s(itf %d): receive FIFO overrun\n", dev->type,dev->number); } #ifdef GENERAL_DEBUG if (istat & (IDT77105_ISTAT_HECERR | IDT77105_ISTAT_SCR | IDT77105_ISTAT_RSE)) { /* normally don't care - just report in stats */ printk(KERN_NOTICE "%s(itf %d): received cell with error\n", dev->type,dev->number); } #endif } static int idt77105_start(struct atm_dev *dev) { unsigned long flags; if (!(dev->phy_data = kmalloc(sizeof(struct idt77105_priv),GFP_KERNEL))) return -ENOMEM; PRIV(dev)->dev = dev; spin_lock_irqsave(&idt77105_priv_lock, flags); PRIV(dev)->next = idt77105_all; idt77105_all = PRIV(dev); spin_unlock_irqrestore(&idt77105_priv_lock, flags); memset(&PRIV(dev)->stats,0,sizeof(struct idt77105_stats)); /* initialise dev->signal from Good Signal Bit */ atm_dev_signal_change(dev, GET(ISTAT) & IDT77105_ISTAT_GOODSIG ? ATM_PHY_SIG_FOUND : ATM_PHY_SIG_LOST); if (dev->signal == ATM_PHY_SIG_LOST) printk(KERN_WARNING "%s(itf %d): no signal\n",dev->type, dev->number); /* initialise loop mode from hardware */ switch ( GET(DIAG) & IDT77105_DIAG_LCMASK ) { case IDT77105_DIAG_LC_NORMAL: PRIV(dev)->loop_mode = ATM_LM_NONE; break; case IDT77105_DIAG_LC_PHY_LOOPBACK: PRIV(dev)->loop_mode = ATM_LM_LOC_ATM; break; case IDT77105_DIAG_LC_LINE_LOOPBACK: PRIV(dev)->loop_mode = ATM_LM_RMT_ATM; break; } /* enable interrupts, e.g. on loss of signal */ PRIV(dev)->old_mcr = GET(MCR); if (dev->signal == ATM_PHY_SIG_FOUND) { PRIV(dev)->old_mcr |= IDT77105_MCR_EIP; PUT(PRIV(dev)->old_mcr, MCR); } idt77105_stats_timer_func(0); /* clear 77105 counters */ (void) fetch_stats(dev,NULL,1); /* clear kernel counters */ spin_lock_irqsave(&idt77105_priv_lock, flags); if (start_timer) { start_timer = 0; stats_timer.expires = jiffies+IDT77105_STATS_TIMER_PERIOD; add_timer(&stats_timer); restart_timer.expires = jiffies+IDT77105_RESTART_TIMER_PERIOD; add_timer(&restart_timer); } spin_unlock_irqrestore(&idt77105_priv_lock, flags); return 0; } static int idt77105_stop(struct atm_dev *dev) { struct idt77105_priv *walk, *prev; DPRINTK("%s(itf %d): stopping IDT77105\n",dev->type,dev->number); /* disable interrupts */ PUT( GET(MCR) & ~IDT77105_MCR_EIP, MCR ); /* detach private struct from atm_dev & free */ for (prev = NULL, walk = idt77105_all ; walk != NULL; prev = walk, walk = walk->next) { if (walk->dev == dev) { if (prev != NULL) prev->next = walk->next; else idt77105_all = walk->next; dev->phy = NULL; dev->phy_data = NULL; kfree(walk); break; } } return 0; } static const struct atmphy_ops idt77105_ops = { .start = idt77105_start, .ioctl = idt77105_ioctl, .interrupt = idt77105_int, .stop = idt77105_stop, }; int idt77105_init(struct atm_dev *dev) { dev->phy = &idt77105_ops; return 0; } EXPORT_SYMBOL(idt77105_init); static void __exit idt77105_exit(void) { /* turn off timers */ del_timer_sync(&stats_timer); del_timer_sync(&restart_timer); } module_exit(idt77105_exit); MODULE_LICENSE("GPL"); |