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/list.h>
  12 #include <linux/netdevice.h>
  13 #include <linux/phy.h>
  14 #include "dsa_priv.h"
  15 #include "mv88e6xxx.h"
  16
  17 /*
  18  * If the switch's ADDR[4:0] strap pins are strapped to zero, it will
  19  * use all 32 SMI bus addresses on its SMI bus, and all switch registers
  20  * will be directly accessible on some {device address,register address}
  21  * pair.  If the ADDR[4:0] pins are not strapped to zero, the switch
  22  * will only respond to SMI transactions to that specific address, and
  23  * an indirect addressing mechanism needs to be used to access its
  24  * registers.
  25  */
  26 static int mv88e6xxx_reg_wait_ready(struct mii_bus *bus, int sw_addr)
  27 {
  28         int ret;
  29         int i;
  30
  31         for (i = 0; i < 16; i++) {
  32                 ret = mdiobus_read(bus, sw_addr, 0);
  33                 if (ret < 0)
  34                         return ret;
  35
  36                 if ((ret & 0x8000) == 0)
  37                         return 0;
  38         }
  39
  40         return -ETIMEDOUT;
  41 }
  42
  43 int __mv88e6xxx_reg_read(struct mii_bus *bus, int sw_addr, int addr, int reg)
  44 {
  45         int ret;
  46
  47         if (sw_addr == 0)
  48                 return mdiobus_read(bus, addr, reg);
  49
  50         /*
  51          * Wait for the bus to become free.
  52          */
  53         ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
  54         if (ret < 0)
  55                 return ret;
  56
  57         /*
  58          * Transmit the read command.
  59          */
  60         ret = mdiobus_write(bus, sw_addr, 0, 0x9800 | (addr << 5) | reg);
  61         if (ret < 0)
  62                 return ret;
  63
  64         /*
  65          * Wait for the read command to complete.
  66          */
  67         ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
  68         if (ret < 0)
  69                 return ret;
  70
  71         /*
  72          * Read the data.
  73          */
  74         ret = mdiobus_read(bus, sw_addr, 1);
  75         if (ret < 0)
  76                 return ret;
  77
  78         return ret & 0xffff;
  79 }
  80
  81 int mv88e6xxx_reg_read(struct dsa_switch *ds, int addr, int reg)
  82 {
  83         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
  84         int ret;
  85
  86         mutex_lock(&ps->smi_mutex);
  87         ret = __mv88e6xxx_reg_read(ds->master_mii_bus,
  88                                    ds->pd->sw_addr, addr, reg);
  89         mutex_unlock(&ps->smi_mutex);
  90
  91         return ret;
  92 }
  93
  94 int __mv88e6xxx_reg_write(struct mii_bus *bus, int sw_addr, int addr,
  95                           int reg, u16 val)
  96 {
  97         int ret;
  98
  99         if (sw_addr == 0)
 100                 return mdiobus_write(bus, addr, reg, val);
 101
 102         /*
 103          * Wait for the bus to become free.
 104          */
 105         ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
 106         if (ret < 0)
 107                 return ret;
 108
 109         /*
 110          * Transmit the data to write.
 111          */
 112         ret = mdiobus_write(bus, sw_addr, 1, val);
 113         if (ret < 0)
 114                 return ret;
 115
 116         /*
 117          * Transmit the write command.
 118          */
 119         ret = mdiobus_write(bus, sw_addr, 0, 0x9400 | (addr << 5) | reg);
 120         if (ret < 0)
 121                 return ret;
 122
 123         /*
 124          * Wait for the write command to complete.
 125          */
 126         ret = mv88e6xxx_reg_wait_ready(bus, sw_addr);
 127         if (ret < 0)
 128                 return ret;
 129
 130         return 0;
 131 }
 132
 133 int mv88e6xxx_reg_write(struct dsa_switch *ds, int addr, int reg, u16 val)
 134 {
 135         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 136         int ret;
 137
 138         mutex_lock(&ps->smi_mutex);
 139         ret = __mv88e6xxx_reg_write(ds->master_mii_bus,
 140                                     ds->pd->sw_addr, addr, reg, val);
 141         mutex_unlock(&ps->smi_mutex);
 142
 143         return ret;
 144 }
 145
 146 int mv88e6xxx_config_prio(struct dsa_switch *ds)
 147 {
 148         /*
 149          * Configure the IP ToS mapping registers.
 150          */
 151         REG_WRITE(REG_GLOBAL, 0x10, 0x0000);
 152         REG_WRITE(REG_GLOBAL, 0x11, 0x0000);
 153         REG_WRITE(REG_GLOBAL, 0x12, 0x5555);
 154         REG_WRITE(REG_GLOBAL, 0x13, 0x5555);
 155         REG_WRITE(REG_GLOBAL, 0x14, 0xaaaa);
 156         REG_WRITE(REG_GLOBAL, 0x15, 0xaaaa);
 157         REG_WRITE(REG_GLOBAL, 0x16, 0xffff);
 158         REG_WRITE(REG_GLOBAL, 0x17, 0xffff);
 159
 160         /*
 161          * Configure the IEEE 802.1p priority mapping register.
 162          */
 163         REG_WRITE(REG_GLOBAL, 0x18, 0xfa41);
 164
 165         return 0;
 166 }
 167
 168 int mv88e6xxx_set_addr_direct(struct dsa_switch *ds, u8 *addr)
 169 {
 170         REG_WRITE(REG_GLOBAL, 0x01, (addr[0] << 8) | addr[1]);
 171         REG_WRITE(REG_GLOBAL, 0x02, (addr[2] << 8) | addr[3]);
 172         REG_WRITE(REG_GLOBAL, 0x03, (addr[4] << 8) | addr[5]);
 173
 174         return 0;
 175 }
 176
 177 int mv88e6xxx_set_addr_indirect(struct dsa_switch *ds, u8 *addr)
 178 {
 179         int i;
 180         int ret;
 181
 182         for (i = 0; i < 6; i++) {
 183                 int j;
 184
 185                 /*
 186                  * Write the MAC address byte.
 187                  */
 188                 REG_WRITE(REG_GLOBAL2, 0x0d, 0x8000 | (i << 8) | addr[i]);
 189
 190                 /*
 191                  * Wait for the write to complete.
 192                  */
 193                 for (j = 0; j < 16; j++) {
 194                         ret = REG_READ(REG_GLOBAL2, 0x0d);
 195                         if ((ret & 0x8000) == 0)
 196                                 break;
 197                 }
 198                 if (j == 16)
 199                         return -ETIMEDOUT;
 200         }
 201
 202         return 0;
 203 }
 204
 205 int mv88e6xxx_phy_read(struct dsa_switch *ds, int addr, int regnum)
 206 {
 207         if (addr >= 0)
 208                 return mv88e6xxx_reg_read(ds, addr, regnum);
 209         return 0xffff;
 210 }
 211
 212 int mv88e6xxx_phy_write(struct dsa_switch *ds, int addr, int regnum, u16 val)
 213 {
 214         if (addr >= 0)
 215                 return mv88e6xxx_reg_write(ds, addr, regnum, val);
 216         return 0;
 217 }
 218
 219 #ifdef CONFIG_NET_DSA_MV88E6XXX_NEED_PPU
 220 static int mv88e6xxx_ppu_disable(struct dsa_switch *ds)
 221 {
 222         int ret;
 223         int i;
 224
 225         ret = REG_READ(REG_GLOBAL, 0x04);
 226         REG_WRITE(REG_GLOBAL, 0x04, ret & ~0x4000);
 227
 228         for (i = 0; i < 1000; i++) {
 229                 ret = REG_READ(REG_GLOBAL, 0x00);
 230                 msleep(1);
 231                 if ((ret & 0xc000) != 0xc000)
 232                         return 0;
 233         }
 234
 235         return -ETIMEDOUT;
 236 }
 237
 238 static int mv88e6xxx_ppu_enable(struct dsa_switch *ds)
 239 {
 240         int ret;
 241         int i;
 242
 243         ret = REG_READ(REG_GLOBAL, 0x04);
 244         REG_WRITE(REG_GLOBAL, 0x04, ret | 0x4000);
 245
 246         for (i = 0; i < 1000; i++) {
 247                 ret = REG_READ(REG_GLOBAL, 0x00);
 248                 msleep(1);
 249                 if ((ret & 0xc000) == 0xc000)
 250                         return 0;
 251         }
 252
 253         return -ETIMEDOUT;
 254 }
 255
 256 static void mv88e6xxx_ppu_reenable_work(struct work_struct *ugly)
 257 {
 258         struct mv88e6xxx_priv_state *ps;
 259
 260         ps = container_of(ugly, struct mv88e6xxx_priv_state, ppu_work);
 261         if (mutex_trylock(&ps->ppu_mutex)) {
 262                 struct dsa_switch *ds = ((struct dsa_switch *)ps) - 1;
 263
 264                 if (mv88e6xxx_ppu_enable(ds) == 0)
 265                         ps->ppu_disabled = 0;
 266                 mutex_unlock(&ps->ppu_mutex);
 267         }
 268 }
 269
 270 static void mv88e6xxx_ppu_reenable_timer(unsigned long _ps)
 271 {
 272         struct mv88e6xxx_priv_state *ps = (void *)_ps;
 273
 274         schedule_work(&ps->ppu_work);
 275 }
 276
 277 static int mv88e6xxx_ppu_access_get(struct dsa_switch *ds)
 278 {
 279         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 280         int ret;
 281
 282         mutex_lock(&ps->ppu_mutex);
 283
 284         /*
 285          * If the PHY polling unit is enabled, disable it so that
 286          * we can access the PHY registers.  If it was already
 287          * disabled, cancel the timer that is going to re-enable
 288          * it.
 289          */
 290         if (!ps->ppu_disabled) {
 291                 ret = mv88e6xxx_ppu_disable(ds);
 292                 if (ret < 0) {
 293                         mutex_unlock(&ps->ppu_mutex);
 294                         return ret;
 295                 }
 296                 ps->ppu_disabled = 1;
 297         } else {
 298                 del_timer(&ps->ppu_timer);
 299                 ret = 0;
 300         }
 301
 302         return ret;
 303 }
 304
 305 static void mv88e6xxx_ppu_access_put(struct dsa_switch *ds)
 306 {
 307         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 308
 309         /*
 310          * Schedule a timer to re-enable the PHY polling unit.
 311          */
 312         mod_timer(&ps->ppu_timer, jiffies + msecs_to_jiffies(10));
 313         mutex_unlock(&ps->ppu_mutex);
 314 }
 315
 316 void mv88e6xxx_ppu_state_init(struct dsa_switch *ds)
 317 {
 318         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 319
 320         mutex_init(&ps->ppu_mutex);
 321         INIT_WORK(&ps->ppu_work, mv88e6xxx_ppu_reenable_work);
 322         init_timer(&ps->ppu_timer);
 323         ps->ppu_timer.data = (unsigned long)ps;
 324         ps->ppu_timer.function = mv88e6xxx_ppu_reenable_timer;
 325 }
 326
 327 int mv88e6xxx_phy_read_ppu(struct dsa_switch *ds, int addr, int regnum)
 328 {
 329         int ret;
 330
 331         ret = mv88e6xxx_ppu_access_get(ds);
 332         if (ret >= 0) {
 333                 ret = mv88e6xxx_reg_read(ds, addr, regnum);
 334                 mv88e6xxx_ppu_access_put(ds);
 335         }
 336
 337         return ret;
 338 }
 339
 340 int mv88e6xxx_phy_write_ppu(struct dsa_switch *ds, int addr,
 341                             int regnum, u16 val)
 342 {
 343         int ret;
 344
 345         ret = mv88e6xxx_ppu_access_get(ds);
 346         if (ret >= 0) {
 347                 ret = mv88e6xxx_reg_write(ds, addr, regnum, val);
 348                 mv88e6xxx_ppu_access_put(ds);
 349         }
 350
 351         return ret;
 352 }
 353 #endif
 354
 355 void mv88e6xxx_poll_link(struct dsa_switch *ds)
 356 {
 357         int i;
 358
 359         for (i = 0; i < DSA_MAX_PORTS; i++) {
 360                 struct net_device *dev;
 361                 int port_status;
 362                 int link;
 363                 int speed;
 364                 int duplex;
 365                 int fc;
 366
 367                 dev = ds->ports[i];
 368                 if (dev == NULL)
 369                         continue;
 370
 371                 link = 0;
 372                 if (dev->flags & IFF_UP) {
 373                         port_status = mv88e6xxx_reg_read(ds, REG_PORT(i), 0x00);
 374                         if (port_status < 0)
 375                                 continue;
 376
 377                         link = !!(port_status & 0x0800);
 378                 }
 379
 380                 if (!link) {
 381                         if (netif_carrier_ok(dev)) {
 382                                 printk(KERN_INFO "%s: link down\n", dev->name);
 383                                 netif_carrier_off(dev);
 384                         }
 385                         continue;
 386                 }
 387
 388                 switch (port_status & 0x0300) {
 389                 case 0x0000:
 390                         speed = 10;
 391                         break;
 392                 case 0x0100:
 393                         speed = 100;
 394                         break;
 395                 case 0x0200:
 396                         speed = 1000;
 397                         break;
 398                 default:
 399                         speed = -1;
 400                         break;
 401                 }
 402                 duplex = (port_status & 0x0400) ? 1 : 0;
 403                 fc = (port_status & 0x8000) ? 1 : 0;
 404
 405                 if (!netif_carrier_ok(dev)) {
 406                         printk(KERN_INFO "%s: link up, %d Mb/s, %s duplex, "
 407                                          "flow control %sabled\n", dev->name,
 408                                          speed, duplex ? "full" : "half",
 409                                          fc ? "en" : "dis");
 410                         netif_carrier_on(dev);
 411                 }
 412         }
 413 }
 414
 415 static int mv88e6xxx_stats_wait(struct dsa_switch *ds)
 416 {
 417         int ret;
 418         int i;
 419
 420         for (i = 0; i < 10; i++) {
 421                 ret = REG_READ(REG_GLOBAL2, 0x1d);
 422                 if ((ret & 0x8000) == 0)
 423                         return 0;
 424         }
 425
 426         return -ETIMEDOUT;
 427 }
 428
 429 static int mv88e6xxx_stats_snapshot(struct dsa_switch *ds, int port)
 430 {
 431         int ret;
 432
 433         /*
 434          * Snapshot the hardware statistics counters for this port.
 435          */
 436         REG_WRITE(REG_GLOBAL, 0x1d, 0xdc00 | port);
 437
 438         /*
 439          * Wait for the snapshotting to complete.
 440          */
 441         ret = mv88e6xxx_stats_wait(ds);
 442         if (ret < 0)
 443                 return ret;
 444
 445         return 0;
 446 }
 447
 448 static void mv88e6xxx_stats_read(struct dsa_switch *ds, int stat, u32 *val)
 449 {
 450         u32 _val;
 451         int ret;
 452
 453         *val = 0;
 454
 455         ret = mv88e6xxx_reg_write(ds, REG_GLOBAL, 0x1d, 0xcc00 | stat);
 456         if (ret < 0)
 457                 return;
 458
 459         ret = mv88e6xxx_stats_wait(ds);
 460         if (ret < 0)
 461                 return;
 462
 463         ret = mv88e6xxx_reg_read(ds, REG_GLOBAL, 0x1e);
 464         if (ret < 0)
 465                 return;
 466
 467         _val = ret << 16;
 468
 469         ret = mv88e6xxx_reg_read(ds, REG_GLOBAL, 0x1f);
 470         if (ret < 0)
 471                 return;
 472
 473         *val = _val | ret;
 474 }
 475
 476 void mv88e6xxx_get_strings(struct dsa_switch *ds,
 477                            int nr_stats, struct mv88e6xxx_hw_stat *stats,
 478                            int port, uint8_t *data)
 479 {
 480         int i;
 481
 482         for (i = 0; i < nr_stats; i++) {
 483                 memcpy(data + i * ETH_GSTRING_LEN,
 484                        stats[i].string, ETH_GSTRING_LEN);
 485         }
 486 }
 487
 488 void mv88e6xxx_get_ethtool_stats(struct dsa_switch *ds,
 489                                  int nr_stats, struct mv88e6xxx_hw_stat *stats,
 490                                  int port, uint64_t *data)
 491 {
 492         struct mv88e6xxx_priv_state *ps = (void *)(ds + 1);
 493         int ret;
 494         int i;
 495
 496         mutex_lock(&ps->stats_mutex);
 497
 498         ret = mv88e6xxx_stats_snapshot(ds, port);
 499         if (ret < 0) {
 500                 mutex_unlock(&ps->stats_mutex);
 501                 return;
 502         }
 503
 504         /*
 505          * Read each of the counters.
 506          */
 507         for (i = 0; i < nr_stats; i++) {
 508                 struct mv88e6xxx_hw_stat *s = stats + i;
 509                 u32 low;
 510                 u32 high;
 511
 512                 mv88e6xxx_stats_read(ds, s->reg, &low);
 513                 if (s->sizeof_stat == 8)
 514                         mv88e6xxx_stats_read(ds, s->reg + 1, &high);
 515                 else
 516                         high = 0;
 517
 518                 data[i] = (((u64)high) << 32) | low;
 519         }
 520
 521         mutex_unlock(&ps->stats_mutex);
 522 }