drivers/net/dsa/mv88e6xxx.c

   1 /*
   2  * net/dsa/mv88e6xxx.c - Marvell 88e6xxx switch chip support
   3  * Copyright (c) 2008 Marvell Semiconductor
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/jiffies.h>
  13 #include <linux/list.h>
  14 #include <linux/module.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/phy.h>
  17 #include <net/dsa.h>
  18 #include "mv88e6xxx.h"
  19
  20 /* If the switch's ADDR[4:0] strap pins are strapped to zero, it will
  21  * use all 32 SMI bus addresses on its SMI bus, and all switch registers
  22  * will be directly accessible on some {device address,register address}
  23  * pair.  If the ADDR[4:0] pins are not strapped to zero, the switch
  24  * will only respond to SMI transactions to that specific address, and
  25  * an indirect addressing mechanism needs to be used to access its
  26  * registers.
  27  */
  28 static int mv88e6xxx_reg_wait_ready(struct mii_bus *bus, int sw_addr)
  29 {
  30         int ret;
  31         int i;
  32
  33         for (i = 0; i < 16; i++) {
  34                 ret = mdiobus_read(bus, sw_addr, 0);
  35                 if (ret < 0)
  36                         return ret;
  37
  38                 if ((ret & 0x8000) == 0)
  39                         return 0;
  40         }
  41
  42         return -ETIMEDOUT;
  43 }
  44
  45 int __mv88e6xxx_reg_read(struct mii_bus *bus, int sw_addr, int addr, int reg)
  46 {
  47         int ret;
  48
  49         if (sw_addr == 0)
  50                 return mdiobus_read(bus, addr, reg);
  51
  52         /* Wait for the bus to become free. */
  53         ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
  54         if (ret < 0)
  55                 return ret;
  56
  57         /* Transmit the read command. */
  58         ret = mdiobus_write(bus, sw_addr, 0, 0x9800 | (addr << 5) | reg);
  59         if (ret < 0)
  60                 return ret;
  61
  62         /* Wait for the read command to complete. */
  63         ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
  64         if (ret < 0)
  65                 return ret;
  66
  67         /* Read the data. */
  68         ret = mdiobus_read(bus, sw_addr, 1);
  69         if (ret < 0)
  70                 return ret;
  71
  72         return ret & 0xffff;
  73 }
  74
  75 int mv88e6xxx_reg_read(struct dsa_switch *ds, int addr, int reg)
  76 {
  77         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
  78         int ret;
  79
  80         mutex_lock(&ps->smi_mutex);
  81         ret = __mv88e6xxx_reg_read(ds->master_mii_bus,
  82                                    ds->pd->sw_addr, addr, reg);
  83         mutex_unlock(&ps->smi_mutex);
  84
  85         return ret;
  86 }
  87
  88 int __mv88e6xxx_reg_write(struct mii_bus *bus, int sw_addr, int addr,
  89                           int reg, u16 val)
  90 {
  91         int ret;
  92
  93         if (sw_addr == 0)
  94                 return mdiobus_write(bus, addr, reg, val);
  95
  96         /* Wait for the bus to become free. */
  97         ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
  98         if (ret < 0)
  99                 return ret;
 100
 101         /* Transmit the data to write. */
 102         ret = mdiobus_write(bus, sw_addr, 1, val);
 103         if (ret < 0)
 104                 return ret;
 105
 106         /* Transmit the write command. */
 107         ret = mdiobus_write(bus, sw_addr, 0, 0x9400 | (addr << 5) | reg);
 108         if (ret < 0)
 109                 return ret;
 110
 111         /* Wait for the write command to complete. */
 112         ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
 113         if (ret < 0)
 114                 return ret;
 115
 116         return 0;
 117 }
 118
 119 int mv88e6xxx_reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
 120 {
 121         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 122         int ret;
 123
 124         mutex_lock(&ps->smi_mutex);
 125         ret = __mv88e6xxx_reg_write(ds->master_mii_bus,
 126                                     ds->pd->sw_addr, addr, reg, val);
 127         mutex_unlock(&ps->smi_mutex);
 128
 129         return ret;
 130 }
 131
 132 int mv88e6xxx_config_prio(struct dsa_switch *ds)
 133 {
 134         /* Configure the IP ToS mapping registers. */
 135         REG_WRITE(REG_GLOBAL, 0x10, 0x0000);
 136         REG_WRITE(REG_GLOBAL, 0x11, 0x0000);
 137         REG_WRITE(REG_GLOBAL, 0x12, 0x5555);
 138         REG_WRITE(REG_GLOBAL, 0x13, 0x5555);
 139         REG_WRITE(REG_GLOBAL, 0x14, 0xaaaa);
 140         REG_WRITE(REG_GLOBAL, 0x15, 0xaaaa);
 141         REG_WRITE(REG_GLOBAL, 0x16, 0xffff);
 142         REG_WRITE(REG_GLOBAL, 0x17, 0xffff);
 143
 144         /* Configure the IEEE 802.1p priority mapping register. */
 145         REG_WRITE(REG_GLOBAL, 0x18, 0xfa41);
 146
 147         return 0;
 148 }
 149
 150 int mv88e6xxx_set_addr_direct(struct dsa_switch *ds, u8 *addr)
 151 {
 152         REG_WRITE(REG_GLOBAL, 0x01, (addr[0] << 8) | addr[1]);
 153         REG_WRITE(REG_GLOBAL, 0x02, (addr[2] << 8) | addr[3]);
 154         REG_WRITE(REG_GLOBAL, 0x03, (addr[4] << 8) | addr[5]);
 155
 156         return 0;
 157 }
 158
 159 int mv88e6xxx_set_addr_indirect(struct dsa_switch *ds, u8 *addr)
 160 {
 161         int i;
 162         int ret;
 163
 164         for (i = 0; i < 6; i++) {
 165                 int j;
 166
 167                 /* Write the MAC address byte. */
 168                 REG_WRITE(REG_GLOBAL2, 0x0d, 0x8000 | (i << 8) | addr[i]);
 169
 170                 /* Wait for the write to complete. */
 171                 for (j = 0; j < 16; j++) {
 172                         ret = REG_READ(REG_GLOBAL2, 0x0d);
 173                         if ((ret & 0x8000) == 0)
 174                                 break;
 175                 }
 176                 if (j == 16)
 177                         return -ETIMEDOUT;
 178         }
 179
 180         return 0;
 181 }
 182
 183 int mv88e6xxx_phy_read(struct dsa_switch *ds, int addr, int regnum)
 184 {
 185         if (addr >= 0)
 186                 return mv88e6xxx_reg_read(ds, addr, regnum);
 187         return 0xffff;
 188 }
 189
 190 int mv88e6xxx_phy_write(struct dsa_switch *ds, int addr, int regnum, u16 val)
 191 {
 192         if (addr >= 0)
 193                 return mv88e6xxx_reg_write(ds, addr, regnum, val);
 194         return 0;
 195 }
 196
 197 #ifdef CONFIG_NET_DSA_MV88E6XXX_NEED_PPU
 198 static int mv88e6xxx_ppu_disable(struct dsa_switch *ds)
 199 {
 200         int ret;
 201         unsigned long timeout;
 202
 203         ret = REG_READ(REG_GLOBAL, 0x04);
 204         REG_WRITE(REG_GLOBAL, 0x04, ret & ~0x4000);
 205
 206         timeout = jiffies + 1 * HZ;
 207         while (time_before(jiffies, timeout)) {
 208                 ret = REG_READ(REG_GLOBAL, 0x00);
 209                 usleep_range(1000, 2000);
 210                 if ((ret & 0xc000) != 0xc000)
 211                         return 0;
 212         }
 213
 214         return -ETIMEDOUT;
 215 }
 216
 217 static int mv88e6xxx_ppu_enable(struct dsa_switch *ds)
 218 {
 219         int ret;
 220         unsigned long timeout;
 221
 222         ret = REG_READ(REG_GLOBAL, 0x04);
 223         REG_WRITE(REG_GLOBAL, 0x04, ret | 0x4000);
 224
 225         timeout = jiffies + 1 * HZ;
 226         while (time_before(jiffies, timeout)) {
 227                 ret = REG_READ(REG_GLOBAL, 0x00);
 228                 usleep_range(1000, 2000);
 229                 if ((ret & 0xc000) == 0xc000)
 230                         return 0;
 231         }
 232
 233         return -ETIMEDOUT;
 234 }
 235
 236 static void mv88e6xxx_ppu_reenable_work(struct work_struct *ugly)
 237 {
 238         struct mv88e6xxx_priv_state *ps;
 239
 240         ps = container_of(ugly, struct mv88e6xxx_priv_state, ppu_work);
 241         if (mutex_trylock(&ps->ppu_mutex)) {
 242                 struct dsa_switch *ds = ((struct dsa_switch *)ps) - 1;
 243
 244                 if (mv88e6xxx_ppu_enable(ds) == 0)
 245                         ps->ppu_disabled = 0;
 246                 mutex_unlock(&ps->ppu_mutex);
 247         }
 248 }
 249
 250 static void mv88e6xxx_ppu_reenable_timer(unsigned long _ps)
 251 {
 252         struct mv88e6xxx_priv_state *ps = (void *)_ps;
 253
 254         schedule_work(&ps->ppu_work);
 255 }
 256
 257 static int mv88e6xxx_ppu_access_get(struct dsa_switch *ds)
 258 {
 259         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 260         int ret;
 261
 262         mutex_lock(&ps->ppu_mutex);
 263
 264         /* If the PHY polling unit is enabled, disable it so that
 265          * we can access the PHY registers.  If it was already
 266          * disabled, cancel the timer that is going to re-enable
 267          * it.
 268          */
 269         if (!ps->ppu_disabled) {
 270                 ret = mv88e6xxx_ppu_disable(ds);
 271                 if (ret < 0) {
 272                         mutex_unlock(&ps->ppu_mutex);
 273                         return ret;
 274                 }
 275                 ps->ppu_disabled = 1;
 276         } else {
 277                 del_timer(&ps->ppu_timer);
 278                 ret = 0;
 279         }
 280
 281         return ret;
 282 }
 283
 284 static void mv88e6xxx_ppu_access_put(struct dsa_switch *ds)
 285 {
 286         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 287
 288         /* Schedule a timer to re-enable the PHY polling unit. */
 289         mod_timer(&ps->ppu_timer, jiffies + msecs_to_jiffies(10));
 290         mutex_unlock(&ps->ppu_mutex);
 291 }
 292
 293 void mv88e6xxx_ppu_state_init(struct dsa_switch *ds)
 294 {
 295         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 296
 297         mutex_init(&ps->ppu_mutex);
 298         INIT_WORK(&ps->ppu_work, mv88e6xxx_ppu_reenable_work);
 299         init_timer(&ps->ppu_timer);
 300         ps->ppu_timer.data = (unsigned long)ps;
 301         ps->ppu_timer.function = mv88e6xxx_ppu_reenable_timer;
 302 }
 303
 304 int mv88e6xxx_phy_read_ppu(struct dsa_switch *ds, int addr, int regnum)
 305 {
 306         int ret;
 307
 308         ret = mv88e6xxx_ppu_access_get(ds);
 309         if (ret >= 0) {
 310                 ret = mv88e6xxx_reg_read(ds, addr, regnum);
 311                 mv88e6xxx_ppu_access_put(ds);
 312         }
 313
 314         return ret;
 315 }
 316
 317 int mv88e6xxx_phy_write_ppu(struct dsa_switch *ds, int addr,
 318                             int regnum, u16 val)
 319 {
 320         int ret;
 321
 322         ret = mv88e6xxx_ppu_access_get(ds);
 323         if (ret >= 0) {
 324                 ret = mv88e6xxx_reg_write(ds, addr, regnum, val);
 325                 mv88e6xxx_ppu_access_put(ds);
 326         }
 327
 328         return ret;
 329 }
 330 #endif
 331
 332 void mv88e6xxx_poll_link(struct dsa_switch *ds)
 333 {
 334         int i;
 335
 336         for (i = 0; i < DSA_MAX_PORTS; i++) {
 337                 struct net_device *dev;
 338                 int uninitialized_var(port_status);
 339                 int link;
 340                 int speed;
 341                 int duplex;
 342                 int fc;
 343
 344                 dev = ds->ports[i];
 345                 if (dev == NULL)
 346                         continue;
 347
 348                 link = 0;
 349                 if (dev->flags & IFF_UP) {
 350                         port_status = mv88e6xxx_reg_read(ds, REG_PORT(i), 0x00);
 351                         if (port_status < 0)
 352                                 continue;
 353
 354                         link = !!(port_status & 0x0800);
 355                 }
 356
 357                 if (!link) {
 358                         if (netif_carrier_ok(dev)) {
 359                                 netdev_info(dev, "link down\n");
 360                                 netif_carrier_off(dev);
 361                         }
 362                         continue;
 363                 }
 364
 365                 switch (port_status & 0x0300) {
 366                 case 0x0000:
 367                         speed = 10;
 368                         break;
 369                 case 0x0100:
 370                         speed = 100;
 371                         break;
 372                 case 0x0200:
 373                         speed = 1000;
 374                         break;
 375                 default:
 376                         speed = -1;
 377                         break;
 378                 }
 379                 duplex = (port_status & 0x0400) ? 1 : 0;
 380                 fc = (port_status & 0x8000) ? 1 : 0;
 381
 382                 if (!netif_carrier_ok(dev)) {
 383                         netdev_info(dev,
 384                                     "link up, %d Mb/s, %s duplex, flow control %sabled\n",
 385                                     speed,
 386                                     duplex ? "full" : "half",
 387                                     fc ? "en" : "dis");
 388                         netif_carrier_on(dev);
 389                 }
 390         }
 391 }
 392
 393 static int mv88e6xxx_stats_wait(struct dsa_switch *ds)
 394 {
 395         int ret;
 396         int i;
 397
 398         for (i = 0; i < 10; i++) {
 399                 ret = REG_READ(REG_GLOBAL, 0x1d);
 400                 if ((ret & 0x8000) == 0)
 401                         return 0;
 402         }
 403
 404         return -ETIMEDOUT;
 405 }
 406
 407 static int mv88e6xxx_stats_snapshot(struct dsa_switch *ds, int port)
 408 {
 409         int ret;
 410
 411         /* Snapshot the hardware statistics counters for this port. */
 412         REG_WRITE(REG_GLOBAL, 0x1d, 0xdc00 | port);
 413
 414         /* Wait for the snapshotting to complete. */
 415         ret = mv88e6xxx_stats_wait(ds);
 416         if (ret < 0)
 417                 return ret;
 418
 419         return 0;
 420 }
 421
 422 static void mv88e6xxx_stats_read(struct dsa_switch *ds, int stat, u32 *val)
 423 {
 424         u32 _val;
 425         int ret;
 426
 427         *val = 0;
 428
 429         ret = mv88e6xxx_reg_write(ds, REG_GLOBAL, 0x1d, 0xcc00 | stat);
 430         if (ret < 0)
 431                 return;
 432
 433         ret = mv88e6xxx_stats_wait(ds);
 434         if (ret < 0)
 435                 return;
 436
 437         ret = mv88e6xxx_reg_read(ds, REG_GLOBAL, 0x1e);
 438         if (ret < 0)
 439                 return;
 440
 441         _val = ret << 16;
 442
 443         ret = mv88e6xxx_reg_read(ds, REG_GLOBAL, 0x1f);
 444         if (ret < 0)
 445                 return;
 446
 447         *val = _val | ret;
 448 }
 449
 450 void mv88e6xxx_get_strings(struct dsa_switch *ds,
 451                            int nr_stats, struct mv88e6xxx_hw_stat *stats,
 452                            int port, uint8_t *data)
 453 {
 454         int i;
 455
 456         for (i = 0; i < nr_stats; i++) {
 457                 memcpy(data + i * ETH_GSTRING_LEN,
 458                        stats[i].string, ETH_GSTRING_LEN);
 459         }
 460 }
 461
 462 void mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds,
 463                                  int nr_stats, struct mv88e6xxx_hw_stat *stats,
 464                                  int port, uint64_t *data)
 465 {
 466         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 467         int ret;
 468         int i;
 469
 470         mutex_lock(&ps->stats_mutex);
 471
 472         ret = mv88e6xxx_stats_snapshot(ds, port);
 473         if (ret < 0) {
 474                 mutex_unlock(&ps->stats_mutex);
 475                 return;
 476         }
 477
 478         /* Read each of the counters. */
 479         for (i = 0; i < nr_stats; i++) {
 480                 struct mv88e6xxx_hw_stat *s = stats + i;
 481                 u32 low;
 482                 u32 high;
 483
 484                 mv88e6xxx_stats_read(ds, s->reg, &low);
 485                 if (s->sizeof_stat == 8)
 486                         mv88e6xxx_stats_read(ds, s->reg + 1, &high);
 487                 else
 488                         high = 0;
 489
 490                 data[i] = (((u64)high) << 32) | low;
 491         }
 492
 493         mutex_unlock(&ps->stats_mutex);
 494 }
 495
 496 static int __init mv88e6xxx_init(void)
 497 {
 498 #if IS_ENABLED(CONFIG_NET_DSA_MV88E6131)
 499         register_switch_driver(&mv88e6131_switch_driver);
 500 #endif
 501 #if IS_ENABLED(CONFIG_NET_DSA_MV88E6123_61_65)
 502         register_switch_driver(&mv88e6123_61_65_switch_driver);
 503 #endif
 504         return 0;
 505 }
 506 module_init(mv88e6xxx_init);
 507
 508 static void __exit mv88e6xxx_cleanup(void)
 509 {
 510 #if IS_ENABLED(CONFIG_NET_DSA_MV88E6123_61_65)
 511         unregister_switch_driver(&mv88e6123_61_65_switch_driver);
 512 #endif
 513 #if IS_ENABLED(CONFIG_NET_DSA_MV88E6131)
 514         unregister_switch_driver(&mv88e6131_switch_driver);
 515 #endif
 516 }
 517 module_exit(mv88e6xxx_cleanup);
 518
 519 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
 520 MODULE_DESCRIPTION("Driver for Marvell 88E6XXX ethernet switch chips");
 521 MODULE_LICENSE("GPL");