target/linux/generic-2.6/files/drivers/net/phy/ar8216.c

   1 /*
   2  * ar8216.c: AR8216 switch driver
   3  *
   4  * Copyright (C) 2009 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/if.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/list.h>
  21 #include <linux/if_ether.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/netlink.h>
  25 #include <linux/bitops.h>
  26 #include <net/genetlink.h>
  27 #include <linux/switch.h>
  28 #include <linux/delay.h>
  29 #include <linux/phy.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include "ar8216.h"
  33
  34
  35 struct ar8216_priv {
  36         int (*hardstart)(struct sk_buff *skb, struct net_device *dev);
  37
  38         struct switch_dev dev;
  39         struct phy_device *phy;
  40         u32 (*read)(struct ar8216_priv *priv, int reg);
  41         void (*write)(struct ar8216_priv *priv, int reg, u32 val);
  42
  43         /* all fields below are cleared on reset */
  44         bool vlan;
  45         u8 vlan_id[AR8216_NUM_VLANS];
  46         u8 vlan_table[AR8216_NUM_VLANS];
  47         u8 vlan_tagged;
  48         u16 pvid[AR8216_NUM_PORTS];
  49 };
  50 static struct switch_dev athdev;
  51
  52 #define to_ar8216(_dev) container_of(_dev, struct ar8216_priv, dev)
  53
  54 static inline void
  55 split_addr(u32 regaddr, u16 *r1, u16 *r2, u16 *page)
  56 {
  57         regaddr >>= 1;
  58         *r1 = regaddr & 0x1e;
  59
  60         regaddr >>= 5;
  61         *r2 = regaddr & 0x7;
  62
  63         regaddr >>= 3;
  64         *page = regaddr & 0x1ff;
  65 }
  66
  67 static u32
  68 ar8216_mii_read(struct ar8216_priv *priv, int reg)
  69 {
  70         struct phy_device *phy = priv->phy;
  71         u16 r1, r2, page;
  72         u16 lo, hi;
  73
  74         split_addr((u32) reg, &r1, &r2, &page);
  75         phy->bus->write(phy->bus, 0x18, 0, page);
  76         msleep(1); /* wait for the page switch to propagate */
  77         lo = phy->bus->read(phy->bus, 0x10 | r2, r1);
  78         hi = phy->bus->read(phy->bus, 0x10 | r2, r1 + 1);
  79
  80         return (hi << 16) | lo;
  81 }
  82
  83 static void
  84 ar8216_mii_write(struct ar8216_priv *priv, int reg, u32 val)
  85 {
  86         struct phy_device *phy = priv->phy;
  87         u16 r1, r2, r3;
  88         u16 lo, hi;
  89
  90         split_addr((u32) reg, &r1, &r2, &r3);
  91         phy->bus->write(phy->bus, 0x18, 0, r3);
  92         msleep(1); /* wait for the page switch to propagate */
  93
  94         lo = val & 0xffff;
  95         hi = (u16) (val >> 16);
  96         phy->bus->write(phy->bus, 0x10 | r2, r1 + 1, hi);
  97         phy->bus->write(phy->bus, 0x10 | r2, r1, lo);
  98 }
  99
 100 static u32
 101 ar8216_rmw(struct ar8216_priv *priv, int reg, u32 mask, u32 val)
 102 {
 103         u32 v;
 104
 105         v = priv->read(priv, reg);
 106         v &= ~mask;
 107         v |= val;
 108         priv->write(priv, reg, v);
 109
 110         return v;
 111 }
 112
 113 static int
 114 ar8216_set_vlan(struct switch_dev *dev, const struct switch_attr *attr,
 115                 struct switch_val *val)
 116 {
 117         struct ar8216_priv *priv = to_ar8216(dev);
 118         priv->vlan = !!val->value.i;
 119         return 0;
 120 }
 121
 122 static int
 123 ar8216_get_vlan(struct switch_dev *dev, const struct switch_attr *attr,
 124                 struct switch_val *val)
 125 {
 126         struct ar8216_priv *priv = to_ar8216(dev);
 127         val->value.i = priv->vlan;
 128         return 0;
 129 }
 130
 131
 132 static int
 133 ar8216_set_pvid(struct switch_dev *dev, int port, int vlan)
 134 {
 135         struct ar8216_priv *priv = to_ar8216(dev);
 136         priv->pvid[port] = vlan;
 137         return 0;
 138 }
 139
 140 static int
 141 ar8216_get_pvid(struct switch_dev *dev, int port, int *vlan)
 142 {
 143         struct ar8216_priv *priv = to_ar8216(dev);
 144         *vlan = priv->pvid[port];
 145         return 0;
 146 }
 147
 148 static int
 149 ar8216_set_vid(struct switch_dev *dev, const struct switch_attr *attr,
 150                 struct switch_val *val)
 151 {
 152         struct ar8216_priv *priv = to_ar8216(dev);
 153         priv->vlan_id[val->port_vlan] = val->value.i;
 154         return 0;
 155 }
 156
 157 static int
 158 ar8216_get_vid(struct switch_dev *dev, const struct switch_attr *attr,
 159                 struct switch_val *val)
 160 {
 161         struct ar8216_priv *priv = to_ar8216(dev);
 162         val->value.i = priv->vlan_id[val->port_vlan];
 163         return 0;
 164 }
 165
 166
 167 static int
 168 ar8216_mangle_tx(struct sk_buff *skb, struct net_device *dev)
 169 {
 170         struct ar8216_priv *priv = dev->phy_ptr;
 171         unsigned char *buf;
 172
 173     if (unlikely(!priv))
 174         goto error;
 175
 176         if (!priv->vlan)
 177                 goto send;
 178
 179         if (unlikely(skb_headroom(skb) < 2)) {
 180                 if (pskb_expand_head(skb, 2, 0, GFP_ATOMIC) < 0)
 181                         goto error;
 182         }
 183
 184         buf = skb_push(skb, 2);
 185         buf[0] = 0x10;
 186         buf[1] = 0x80;
 187
 188 send:
 189         return priv->hardstart(skb, dev);
 190
 191 error:
 192         dev_kfree_skb_any(skb);
 193         return 0;
 194 }
 195
 196 static int
 197 ar8216_mangle_rx(struct sk_buff *skb, int napi)
 198 {
 199         struct ar8216_priv *priv;
 200         struct net_device *dev;
 201         unsigned char *buf;
 202         int port, vlan;
 203
 204         dev = skb->dev;
 205         if (!dev)
 206                 goto error;
 207
 208         priv = dev->phy_ptr;
 209         if (!priv)
 210                 goto error;
 211
 212         /* don't strip the header if vlan mode is disabled */
 213         if (!priv->vlan)
 214                 goto recv;
 215
 216         /* strip header, get vlan id */
 217         buf = skb->data;
 218         skb_pull(skb, 2);
 219
 220         /* check for vlan header presence */
 221         if ((buf[12 + 2] != 0x81) || (buf[13 + 2] != 0x00))
 222                 goto recv;
 223
 224         port = buf[0] & 0xf;
 225
 226         /* no need to fix up packets coming from a tagged source */
 227         if (priv->vlan_tagged & (1 << port))
 228                 goto recv;
 229
 230         /* lookup port vid from local table, the switch passes an invalid vlan id */
 231         vlan = priv->pvid[port];
 232
 233         buf[14 + 2] &= 0xf0;
 234         buf[14 + 2] |= vlan >> 8;
 235         buf[15 + 2] = vlan & 0xff;
 236
 237 recv:
 238         skb->protocol = eth_type_trans(skb, skb->dev);
 239
 240         if (napi)
 241                 return netif_receive_skb(skb);
 242         else
 243                 return netif_rx(skb);
 244
 245 error:
 246         /* no vlan? eat the packet! */
 247         dev_kfree_skb_any(skb);
 248         return 0;
 249 }
 250
 251 static int
 252 ar8216_netif_rx(struct sk_buff *skb)
 253 {
 254         return ar8216_mangle_rx(skb, 0);
 255 }
 256
 257 static int
 258 ar8216_netif_receive_skb(struct sk_buff *skb)
 259 {
 260         return ar8216_mangle_rx(skb, 1);
 261 }
 262
 263
 264 static struct switch_attr ar8216_globals[] = {
 265         {
 266                 .type = SWITCH_TYPE_INT,
 267                 .name = "vlan",
 268                 .description = "Enable VLAN mode",
 269                 .set = ar8216_set_vlan,
 270                 .get = ar8216_get_vlan,
 271                 .max = 1
 272         },
 273 };
 274
 275 static struct switch_attr ar8216_port[] = {
 276 };
 277
 278 static struct switch_attr ar8216_vlan[] = {
 279         {
 280                 .type = SWITCH_TYPE_INT,
 281                 .name = "pvid",
 282                 .description = "VLAN ID",
 283                 .set = ar8216_set_vid,
 284                 .get = ar8216_get_vid,
 285                 .max = 4095,
 286         },
 287 };
 288
 289
 290 static int
 291 ar8216_get_ports(struct switch_dev *dev, struct switch_val *val)
 292 {
 293         struct ar8216_priv *priv = to_ar8216(dev);
 294         u8 ports = priv->vlan_table[val->port_vlan];
 295         int i;
 296
 297         val->len = 0;
 298         for (i = 0; i < AR8216_NUM_PORTS; i++) {
 299                 struct switch_port *p;
 300
 301                 if (!(ports & (1 << i)))
 302                         continue;
 303
 304                 p = &val->value.ports[val->len++];
 305                 p->id = i;
 306                 if (priv->vlan_tagged & (1 << i))
 307                         p->flags = (1 << SWITCH_PORT_FLAG_TAGGED);
 308                 else
 309                         p->flags = 0;
 310         }
 311         return 0;
 312 }
 313
 314 static int
 315 ar8216_set_ports(struct switch_dev *dev, struct switch_val *val)
 316 {
 317         struct ar8216_priv *priv = to_ar8216(dev);
 318         u8 *vt = &priv->vlan_table[val->port_vlan];
 319         int i, j;
 320
 321         *vt = 0;
 322         for (i = 0; i < val->len; i++) {
 323                 struct switch_port *p = &val->value.ports[i];
 324
 325                 if (p->flags & (1 << SWITCH_PORT_FLAG_TAGGED))
 326                         priv->vlan_tagged |= (1 << p->id);
 327                 else {
 328                         priv->vlan_tagged &= ~(1 << p->id);
 329                         priv->pvid[p->id] = val->port_vlan;
 330
 331                         /* make sure that an untagged port does not
 332                          * appear in other vlans */
 333                         for (j = 0; j < AR8216_NUM_VLANS; j++) {
 334                                 if (j == val->port_vlan)
 335                                         continue;
 336                                 priv->vlan_table[j] &= ~(1 << p->id);
 337                         }
 338                 }
 339
 340                 *vt |= 1 << p->id;
 341         }
 342         return 0;
 343 }
 344
 345 static int
 346 ar8216_wait_bit(struct ar8216_priv *priv, int reg, u32 mask, u32 val)
 347 {
 348         int timeout = 20;
 349
 350         while ((priv->read(priv, reg) & mask) != val) {
 351                 if (timeout-- <= 0) {
 352                         printk(KERN_ERR "ar8216: timeout waiting for operation to complete\n");
 353                         return 1;
 354                 }
 355         }
 356         return 0;
 357 }
 358
 359 static void
 360 ar8216_vtu_op(struct ar8216_priv *priv, u32 op, u32 val)
 361 {
 362         if (ar8216_wait_bit(priv, AR8216_REG_VTU, AR8216_VTU_ACTIVE, 0))
 363                 return;
 364         if ((op & AR8216_VTU_OP) == AR8216_VTU_OP_LOAD) {
 365                 val &= AR8216_VTUDATA_MEMBER;
 366                 val |= AR8216_VTUDATA_VALID;
 367                 priv->write(priv, AR8216_REG_VTU_DATA, val);
 368         }
 369         op |= AR8216_VTU_ACTIVE;
 370         priv->write(priv, AR8216_REG_VTU, op);
 371 }
 372
 373 static int
 374 ar8216_hw_apply(struct switch_dev *dev)
 375 {
 376         struct ar8216_priv *priv = to_ar8216(dev);
 377         u8 portmask[AR8216_NUM_PORTS];
 378         int i, j;
 379
 380         /* flush all vlan translation unit entries */
 381         ar8216_vtu_op(priv, AR8216_VTU_OP_FLUSH, 0);
 382
 383         memset(portmask, 0, sizeof(portmask));
 384         if (priv->vlan) {
 385                 /* calculate the port destination masks and load vlans
 386                  * into the vlan translation unit */
 387                 for (j = 0; j < AR8216_NUM_VLANS; j++) {
 388                         u8 vp = priv->vlan_table[j];
 389
 390                         if (!vp)
 391                                 continue;
 392
 393                         for (i = 0; i < AR8216_NUM_PORTS; i++) {
 394                                 u8 mask = (1 << i);
 395                                 if (vp & mask)
 396                                         portmask[i] |= vp & ~mask;
 397                         }
 398
 399                         if (!priv->vlan_table[j])
 400                                 continue;
 401
 402                         ar8216_vtu_op(priv,
 403                                 AR8216_VTU_OP_LOAD |
 404                                 (priv->vlan_id[j] << AR8216_VTU_VID_S),
 405                                 priv->vlan_table[j]);
 406                 }
 407         } else {
 408                 /* vlan disabled:
 409                  * isolate all ports, but connect them to the cpu port */
 410                 for (i = 0; i < AR8216_NUM_PORTS; i++) {
 411                         if (i == AR8216_PORT_CPU)
 412                                 continue;
 413
 414                         portmask[i] = 1 << AR8216_PORT_CPU;
 415                         portmask[AR8216_PORT_CPU] |= (1 << i);
 416                 }
 417         }
 418
 419         /* update the port destination mask registers and tag settings */
 420         for (i = 0; i < AR8216_NUM_PORTS; i++) {
 421                 int egress, ingress;
 422                 int pvid;
 423
 424                 if (priv->vlan) {
 425                         pvid = priv->vlan_id[priv->pvid[i]];
 426                 } else {
 427                         pvid = i;
 428                 }
 429
 430                 if (priv->vlan && (priv->vlan_tagged & (1 << i))) {
 431                         egress = AR8216_OUT_ADD_VLAN;
 432                 } else {
 433                         egress = AR8216_OUT_STRIP_VLAN;
 434                 }
 435                 ingress = AR8216_IN_SECURE;
 436
 437                 ar8216_rmw(priv, AR8216_REG_PORT_CTRL(i),
 438                         AR8216_PORT_CTRL_LEARN | AR8216_PORT_CTRL_VLAN_MODE |
 439                         AR8216_PORT_CTRL_SINGLE_VLAN | AR8216_PORT_CTRL_STATE |
 440                         AR8216_PORT_CTRL_HEADER | AR8216_PORT_CTRL_LEARN_LOCK,
 441                         AR8216_PORT_CTRL_LEARN |
 442                           (i == AR8216_PORT_CPU ? AR8216_PORT_CTRL_HEADER : 0) |
 443                           (egress << AR8216_PORT_CTRL_VLAN_MODE_S) |
 444                           (AR8216_PORT_STATE_FORWARD << AR8216_PORT_CTRL_STATE_S));
 445
 446                 ar8216_rmw(priv, AR8216_REG_PORT_VLAN(i),
 447                         AR8216_PORT_VLAN_DEST_PORTS | AR8216_PORT_VLAN_MODE |
 448                           AR8216_PORT_VLAN_DEFAULT_ID,
 449                         (portmask[i] << AR8216_PORT_VLAN_DEST_PORTS_S) |
 450                           (ingress << AR8216_PORT_VLAN_MODE_S) |
 451                           (pvid << AR8216_PORT_VLAN_DEFAULT_ID_S));
 452         }
 453
 454         return 0;
 455 }
 456
 457 static int
 458 ar8216_reset_switch(struct switch_dev *dev)
 459 {
 460         struct ar8216_priv *priv = to_ar8216(dev);
 461         int i;
 462
 463         memset(&priv->vlan, 0, sizeof(struct ar8216_priv) -
 464                 offsetof(struct ar8216_priv, vlan));
 465         for (i = 0; i < AR8216_NUM_VLANS; i++) {
 466                 priv->vlan_id[i] = i;
 467         }
 468         for (i = 0; i < AR8216_NUM_PORTS; i++) {
 469                 /* Enable port learning and tx */
 470                 priv->write(priv, AR8216_REG_PORT_CTRL(i),
 471                         AR8216_PORT_CTRL_LEARN |
 472                         (4 << AR8216_PORT_CTRL_STATE_S));
 473
 474                 priv->write(priv, AR8216_REG_PORT_VLAN(i), 0);
 475
 476                 /* Configure all PHYs */
 477                 if (i == AR8216_PORT_CPU) {
 478                         priv->write(priv, AR8216_REG_PORT_STATUS(i),
 479                                 AR8216_PORT_STATUS_LINK_UP |
 480                                 AR8216_PORT_STATUS_SPEED |
 481                                 AR8216_PORT_STATUS_TXMAC |
 482                                 AR8216_PORT_STATUS_RXMAC |
 483                                 AR8216_PORT_STATUS_DUPLEX);
 484                 } else {
 485                         priv->write(priv, AR8216_REG_PORT_STATUS(i),
 486                                 AR8216_PORT_STATUS_LINK_AUTO);
 487                 }
 488         }
 489         /* XXX: undocumented magic from atheros, required! */
 490         priv->write(priv, 0x38, 0xc000050e);
 491         return ar8216_hw_apply(dev);
 492 }
 493
 494 static int
 495 ar8216_config_init(struct phy_device *pdev)
 496 {
 497         struct ar8216_priv *priv;
 498         struct net_device *dev = pdev->attached_dev;
 499         int ret;
 500
 501         printk("%s: AR8216 PHY driver attached.\n", pdev->attached_dev->name);
 502         pdev->supported = ADVERTISED_100baseT_Full;
 503         pdev->advertising = ADVERTISED_100baseT_Full;
 504
 505         priv = kzalloc(sizeof(struct ar8216_priv), GFP_KERNEL);
 506         if (priv == NULL)
 507                 return -ENOMEM;
 508
 509         priv->phy = pdev;
 510         priv->read = ar8216_mii_read;
 511         priv->write = ar8216_mii_write;
 512         memcpy(&priv->dev, &athdev, sizeof(struct switch_dev));
 513         pdev->priv = priv;
 514         if ((ret = register_switch(&priv->dev, pdev->attached_dev)) < 0) {
 515                 kfree(priv);
 516                 goto done;
 517         }
 518
 519         ret = ar8216_reset_switch(&priv->dev);
 520         if (ret)
 521                 goto done;
 522
 523         dev->phy_ptr = priv;
 524         pdev->pkt_align = 2;
 525         priv->hardstart = dev->hard_start_xmit;
 526         pdev->netif_receive_skb = ar8216_netif_receive_skb;
 527         pdev->netif_rx = ar8216_netif_rx;
 528         dev->hard_start_xmit = ar8216_mangle_tx;
 529
 530 done:
 531         return ret;
 532 }
 533
 534 static int
 535 ar8216_read_status(struct phy_device *phydev)
 536 {
 537         struct ar8216_priv *priv = phydev->priv;
 538
 539         phydev->speed = SPEED_100;
 540         phydev->duplex = DUPLEX_FULL;
 541         phydev->state = PHY_UP;
 542
 543         /* flush the address translation unit */
 544         if (ar8216_wait_bit(priv, AR8216_REG_ATU, AR8216_ATU_ACTIVE, 0))
 545                 return -ETIMEDOUT;
 546
 547         priv->write(priv, AR8216_REG_ATU, AR8216_ATU_OP_FLUSH);
 548
 549         return 0;
 550 }
 551
 552 static int
 553 ar8216_config_aneg(struct phy_device *phydev)
 554 {
 555         return 0;
 556 }
 557
 558 static int
 559 ar8216_probe(struct phy_device *pdev)
 560 {
 561         struct ar8216_priv priv;
 562
 563         u8 id, rev;
 564         u32 val;
 565
 566         priv.phy = pdev;
 567         val = ar8216_mii_read(&priv, AR8216_REG_CTRL);
 568         rev = val & 0xff;
 569         id = (val >> 8) & 0xff;
 570         if ((id != 1) || (rev != 1))
 571                 return -ENODEV;
 572
 573         return 0;
 574 }
 575
 576 static void
 577 ar8216_remove(struct phy_device *pdev)
 578 {
 579         struct ar8216_priv *priv = pdev->priv;
 580         struct net_device *dev = pdev->attached_dev;
 581
 582         if (!priv)
 583                 return;
 584
 585         if (priv->hardstart && dev)
 586                 dev->hard_start_xmit = priv->hardstart;
 587         unregister_switch(&priv->dev);
 588         kfree(priv);
 589 }
 590
 591 /* template */
 592 static struct switch_dev athdev = {
 593         .name = "Atheros AR8216",
 594         .cpu_port = AR8216_PORT_CPU,
 595         .ports = AR8216_NUM_PORTS,
 596         .vlans = AR8216_NUM_VLANS,
 597         .attr_global = {
 598                 .attr = ar8216_globals,
 599                 .n_attr = ARRAY_SIZE(ar8216_globals),
 600         },
 601         .attr_port = {
 602                 .attr = ar8216_port,
 603                 .n_attr = ARRAY_SIZE(ar8216_port),
 604         },
 605         .attr_vlan = {
 606                 .attr = ar8216_vlan,
 607                 .n_attr = ARRAY_SIZE(ar8216_vlan),
 608         },
 609         .get_port_pvid = ar8216_get_pvid,
 610         .set_port_pvid = ar8216_set_pvid,
 611         .get_vlan_ports = ar8216_get_ports,
 612         .set_vlan_ports = ar8216_set_ports,
 613         .apply_config = ar8216_hw_apply,
 614         .reset_switch = ar8216_reset_switch,
 615 };
 616
 617 static struct phy_driver ar8216_driver = {
 618         .name           = "Atheros AR8216",
 619         .features       = PHY_BASIC_FEATURES,
 620         .probe          = ar8216_probe,
 621         .remove         = ar8216_remove,
 622         .config_init    = &ar8216_config_init,
 623         .config_aneg    = &ar8216_config_aneg,
 624         .read_status    = &ar8216_read_status,
 625         .driver         = { .owner = THIS_MODULE },
 626 };
 627
 628 int __init
 629 ar8216_init(void)
 630 {
 631         return phy_driver_register(&ar8216_driver);
 632 }
 633
 634 void __exit
 635 ar8216_exit(void)
 636 {
 637         phy_driver_unregister(&ar8216_driver);
 638 }
 639
 640 module_init(ar8216_init);
 641 module_exit(ar8216_exit);
 642 MODULE_LICENSE("GPL");
 643