target/linux/generic/files/drivers/net/phy/mvswitch.c

   1 /*
   2  * Marvell 88E6060 switch driver
   3  * Copyright (c) 2008 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute  it and/or modify it
   6  * under  the terms of the GNU General Public License v2 as published by the
   7  * Free Software Foundation
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/string.h>
  11 #include <linux/errno.h>
  12 #include <linux/unistd.h>
  13 #include <linux/slab.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/init.h>
  16 #include <linux/delay.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/skbuff.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/mm.h>
  22 #include <linux/module.h>
  23 #include <linux/mii.h>
  24 #include <linux/ethtool.h>
  25 #include <linux/phy.h>
  26 #include <linux/if_vlan.h>
  27
  28 #include <asm/io.h>
  29 #include <asm/irq.h>
  30 #include <asm/uaccess.h>
  31 #include "mvswitch.h"
  32
  33 /* Undefine this to use trailer mode instead.
  34  * I don't know if header mode works with all chips */
  35 #define HEADER_MODE     1
  36
  37 MODULE_DESCRIPTION("Marvell 88E6060 Switch driver");
  38 MODULE_AUTHOR("Felix Fietkau");
  39 MODULE_LICENSE("GPL");
  40
  41 #define MVSWITCH_MAGIC 0x88E6060
  42
  43 struct mvswitch_priv {
  44         const struct net_device_ops *ndo_old;
  45         struct net_device_ops ndo;
  46         struct vlan_group *grp;
  47         u8 vlans[16];
  48 };
  49
  50 #define to_mvsw(_phy) ((struct mvswitch_priv *) (_phy)->priv)
  51
  52 static inline u16
  53 r16(struct phy_device *phydev, int addr, int reg)
  54 {
  55         return phydev->bus->read(phydev->bus, addr, reg);
  56 }
  57
  58 static inline void
  59 w16(struct phy_device *phydev, int addr, int reg, u16 val)
  60 {
  61         phydev->bus->write(phydev->bus, addr, reg, val);
  62 }
  63
  64
  65 static int
  66 mvswitch_mangle_tx(struct sk_buff *skb, struct net_device *dev)
  67 {
  68         struct mvswitch_priv *priv;
  69         char *buf = NULL;
  70         u16 vid;
  71
  72         priv = dev->phy_ptr;
  73         if (unlikely(!priv))
  74                 goto error;
  75
  76         if (unlikely(skb->len < 16))
  77                 goto error;
  78
  79 #ifdef HEADER_MODE
  80         if (__vlan_hwaccel_get_tag(skb, &vid))
  81                 goto error;
  82
  83         if (skb_cloned(skb) || (skb->len <= 62) || (skb_headroom(skb) < MV_HEADER_SIZE)) {
  84                 if (pskb_expand_head(skb, MV_HEADER_SIZE, (skb->len < 62 ? 62 - skb->len : 0), GFP_ATOMIC))
  85                         goto error_expand;
  86                 if (skb->len < 62)
  87                         skb->len = 62;
  88         }
  89         buf = skb_push(skb, MV_HEADER_SIZE);
  90 #else
  91         if (__vlan_get_tag(skb, &vid))
  92                 goto error;
  93
  94         if (unlikely((vid > 15 || !priv->vlans[vid])))
  95                 goto error;
  96
  97         if (skb->len <= 64) {
  98                 if (pskb_expand_head(skb, 0, 64 + MV_TRAILER_SIZE - skb->len, GFP_ATOMIC))
  99                         goto error_expand;
 100
 101                 buf = skb->data + 64;
 102                 skb->len = 64 + MV_TRAILER_SIZE;
 103         } else {
 104                 if (skb_cloned(skb) || unlikely(skb_tailroom(skb) < 4)) {
 105                         if (pskb_expand_head(skb, 0, 4, GFP_ATOMIC))
 106                                 goto error_expand;
 107                 }
 108                 buf = skb_put(skb, 4);
 109         }
 110
 111         /* move the ethernet header 4 bytes forward, overwriting the vlan tag */
 112         memmove(skb->data + 4, skb->data, 12);
 113         skb->data += 4;
 114         skb->len -= 4;
 115         skb->mac_header += 4;
 116 #endif
 117
 118         if (!buf)
 119                 goto error;
 120
 121
 122 #ifdef HEADER_MODE
 123         /* prepend the tag */
 124         *((__be16 *) buf) = cpu_to_be16(
 125                 ((vid << MV_HEADER_VLAN_S) & MV_HEADER_VLAN_M) |
 126                 ((priv->vlans[vid] << MV_HEADER_PORTS_S) & MV_HEADER_PORTS_M)
 127         );
 128 #else
 129         /* append the tag */
 130         *((__be32 *) buf) = cpu_to_be32((
 131                 (MV_TRAILER_OVERRIDE << MV_TRAILER_FLAGS_S) |
 132                 ((priv->vlans[vid] & MV_TRAILER_PORTS_M) << MV_TRAILER_PORTS_S)
 133         ));
 134 #endif
 135
 136         return priv->ndo_old->ndo_start_xmit(skb, dev);
 137
 138 error_expand:
 139         if (net_ratelimit())
 140                 printk("%s: failed to expand/update skb for the switch\n", dev->name);
 141
 142 error:
 143         /* any errors? drop the packet! */
 144         dev_kfree_skb_any(skb);
 145         return 0;
 146 }
 147
 148 static int
 149 mvswitch_mangle_rx(struct sk_buff *skb, int napi)
 150 {
 151         struct mvswitch_priv *priv;
 152         struct net_device *dev;
 153         int vlan = -1;
 154         unsigned char *buf;
 155         int i;
 156
 157         dev = skb->dev;
 158         if (!dev)
 159                 goto error;
 160
 161         priv = dev->phy_ptr;
 162         if (!priv)
 163                 goto error;
 164
 165         if (!priv->grp)
 166                 goto error;
 167
 168 #ifdef HEADER_MODE
 169         buf = skb->data;
 170         skb_pull(skb, MV_HEADER_SIZE);
 171 #else
 172         buf = skb->data + skb->len - MV_TRAILER_SIZE;
 173         if (buf[0] != 0x80)
 174                 goto error;
 175 #endif
 176
 177         /* look for the vlan matching the incoming port */
 178         for (i = 0; i < ARRAY_SIZE(priv->vlans); i++) {
 179                 if ((1 << buf[1]) & priv->vlans[i])
 180                         vlan = i;
 181         }
 182
 183         if (vlan == -1)
 184                 goto error;
 185
 186         skb->protocol = eth_type_trans(skb, skb->dev);
 187
 188         if (napi)
 189                 return vlan_hwaccel_receive_skb(skb, priv->grp, vlan);
 190         else
 191                 return vlan_hwaccel_rx(skb, priv->grp, vlan);
 192
 193 error:
 194         /* no vlan? eat the packet! */
 195         dev_kfree_skb_any(skb);
 196         return 0;
 197 }
 198
 199
 200 static int
 201 mvswitch_netif_rx(struct sk_buff *skb)
 202 {
 203         return mvswitch_mangle_rx(skb, 0);
 204 }
 205
 206 static int
 207 mvswitch_netif_receive_skb(struct sk_buff *skb)
 208 {
 209         return mvswitch_mangle_rx(skb, 1);
 210 }
 211
 212
 213 static void
 214 mvswitch_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
 215 {
 216         struct mvswitch_priv *priv = dev->phy_ptr;
 217         priv->grp = grp;
 218 }
 219
 220
 221 static int
 222 mvswitch_wait_mask(struct phy_device *pdev, int addr, int reg, u16 mask, u16 val)
 223 {
 224         int i = 100;
 225         u16 r;
 226
 227         do {
 228                 r = r16(pdev, addr, reg) & mask;
 229                 if (r == val)
 230                         return 0;
 231         } while(--i > 0);
 232         return -ETIMEDOUT;
 233 }
 234
 235 static int
 236 mvswitch_config_init(struct phy_device *pdev)
 237 {
 238         struct mvswitch_priv *priv = to_mvsw(pdev);
 239         struct net_device *dev = pdev->attached_dev;
 240         u8 vlmap = 0;
 241         int i;
 242
 243         if (!dev)
 244                 return -EINVAL;
 245
 246         printk("%s: Marvell 88E6060 PHY driver attached.\n", dev->name);
 247         pdev->supported = ADVERTISED_100baseT_Full;
 248         pdev->advertising = ADVERTISED_100baseT_Full;
 249         dev->phy_ptr = priv;
 250         pdev->irq = PHY_POLL;
 251 #ifdef HEADER_MODE
 252         dev->flags |= IFF_PROMISC;
 253 #endif
 254
 255         /* initialize default vlans */
 256         for (i = 0; i < MV_PORTS; i++)
 257                 priv->vlans[(i == MV_WANPORT ? 2 : 1)] |= (1 << i);
 258
 259         /* before entering reset, disable all ports */
 260         for (i = 0; i < MV_PORTS; i++)
 261                 w16(pdev, MV_PORTREG(CONTROL, i), 0x00);
 262
 263         msleep(2); /* wait for the status change to settle in */
 264
 265         /* put the ATU in reset */
 266         w16(pdev, MV_SWITCHREG(ATU_CTRL), MV_ATUCTL_RESET);
 267
 268         i = mvswitch_wait_mask(pdev, MV_SWITCHREG(ATU_CTRL), MV_ATUCTL_RESET, 0);
 269         if (i < 0) {
 270                 printk("%s: Timeout waiting for the switch to reset.\n", dev->name);
 271                 return i;
 272         }
 273
 274         /* set the ATU flags */
 275         w16(pdev, MV_SWITCHREG(ATU_CTRL),
 276                 MV_ATUCTL_NO_LEARN |
 277                 MV_ATUCTL_ATU_1K |
 278                 MV_ATUCTL_AGETIME(MV_ATUCTL_AGETIME_MIN) /* minimum without disabling ageing */
 279         );
 280
 281         /* initialize the cpu port */
 282         w16(pdev, MV_PORTREG(CONTROL, MV_CPUPORT),
 283 #ifdef HEADER_MODE
 284                 MV_PORTCTRL_HEADER |
 285 #else
 286                 MV_PORTCTRL_RXTR |
 287                 MV_PORTCTRL_TXTR |
 288 #endif
 289                 MV_PORTCTRL_ENABLED
 290         );
 291         /* wait for the phy change to settle in */
 292         msleep(2);
 293         for (i = 0; i < MV_PORTS; i++) {
 294                 u8 pvid = 0;
 295                 int j;
 296
 297                 vlmap = 0;
 298
 299                 /* look for the matching vlan */
 300                 for (j = 0; j < ARRAY_SIZE(priv->vlans); j++) {
 301                         if (priv->vlans[j] & (1 << i)) {
 302                                 vlmap = priv->vlans[j];
 303                                 pvid = j;
 304                         }
 305                 }
 306                 /* leave port unconfigured if it's not part of a vlan */
 307                 if (!vlmap)
 308                         continue;
 309
 310                 /* add the cpu port to the allowed destinations list */
 311                 vlmap |= (1 << MV_CPUPORT);
 312
 313                 /* take port out of its own vlan destination map */
 314                 vlmap &= ~(1 << i);
 315
 316                 /* apply vlan settings */
 317                 w16(pdev, MV_PORTREG(VLANMAP, i),
 318                         MV_PORTVLAN_PORTS(vlmap) |
 319                         MV_PORTVLAN_ID(i)
 320                 );
 321
 322                 /* re-enable port */
 323                 w16(pdev, MV_PORTREG(CONTROL, i),
 324                         MV_PORTCTRL_ENABLED
 325                 );
 326         }
 327
 328         w16(pdev, MV_PORTREG(VLANMAP, MV_CPUPORT),
 329                 MV_PORTVLAN_ID(MV_CPUPORT)
 330         );
 331
 332         /* set the port association vector */
 333         for (i = 0; i <= MV_PORTS; i++) {
 334                 w16(pdev, MV_PORTREG(ASSOC, i),
 335                         MV_PORTASSOC_PORTS(1 << i)
 336                 );
 337         }
 338
 339         /* init switch control */
 340         w16(pdev, MV_SWITCHREG(CTRL),
 341                 MV_SWITCHCTL_MSIZE |
 342                 MV_SWITCHCTL_DROP
 343         );
 344
 345         /* hook into the tx function */
 346         priv->ndo_old = dev->netdev_ops;
 347         memcpy(&priv->ndo, priv->ndo_old, sizeof(struct net_device_ops));
 348         priv->ndo.ndo_start_xmit = mvswitch_mangle_tx;
 349         priv->ndo.ndo_vlan_rx_register = mvswitch_vlan_rx_register;
 350         dev->netdev_ops = &priv->ndo;
 351
 352         pdev->pkt_align = 2;
 353         pdev->netif_receive_skb = mvswitch_netif_receive_skb;
 354         pdev->netif_rx = mvswitch_netif_rx;
 355 #ifdef HEADER_MODE
 356         dev->features |= NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX;
 357 #else
 358         dev->features |= NETIF_F_HW_VLAN_RX;
 359 #endif
 360
 361         return 0;
 362 }
 363
 364 static int
 365 mvswitch_read_status(struct phy_device *pdev)
 366 {
 367         pdev->speed = SPEED_100;
 368         pdev->duplex = DUPLEX_FULL;
 369         pdev->link = 1;
 370
 371         /* XXX ugly workaround: we can't force the switch
 372          * to gracefully handle hosts moving from one port to another,
 373          * so we have to regularly clear the ATU database */
 374
 375         /* wait for the ATU to become available */
 376         mvswitch_wait_mask(pdev, MV_SWITCHREG(ATU_OP), MV_ATUOP_INPROGRESS, 0);
 377
 378         /* flush the ATU */
 379         w16(pdev, MV_SWITCHREG(ATU_OP),
 380                 MV_ATUOP_INPROGRESS |
 381                 MV_ATUOP_FLUSH_ALL
 382         );
 383
 384         /* wait for operation to complete */
 385         mvswitch_wait_mask(pdev, MV_SWITCHREG(ATU_OP), MV_ATUOP_INPROGRESS, 0);
 386
 387         return 0;
 388 }
 389
 390 static int
 391 mvswitch_config_aneg(struct phy_device *phydev)
 392 {
 393         return 0;
 394 }
 395
 396 static void
 397 mvswitch_remove(struct phy_device *pdev)
 398 {
 399         struct mvswitch_priv *priv = to_mvsw(pdev);
 400         struct net_device *dev = pdev->attached_dev;
 401
 402         /* restore old netdev ops */
 403         if (priv->ndo_old && dev)
 404                 dev->netdev_ops = priv->ndo_old;
 405         dev->phy_ptr = NULL;
 406         dev->features &= ~NETIF_F_HW_VLAN_RX;
 407         kfree(priv);
 408 }
 409
 410 static int
 411 mvswitch_probe(struct phy_device *pdev)
 412 {
 413         struct mvswitch_priv *priv;
 414
 415         priv = kzalloc(sizeof(struct mvswitch_priv), GFP_KERNEL);
 416         if (priv == NULL)
 417                 return -ENOMEM;
 418
 419         pdev->priv = priv;
 420
 421         return 0;
 422 }
 423
 424 static int
 425 mvswitch_fixup(struct phy_device *dev)
 426 {
 427         u16 reg;
 428
 429         if (dev->addr != 0x10)
 430                 return 0;
 431
 432         reg = dev->bus->read(dev->bus, MV_PORTREG(IDENT, 0)) & MV_IDENT_MASK;
 433         if (reg != MV_IDENT_VALUE)
 434                 return 0;
 435
 436         dev->phy_id = MVSWITCH_MAGIC;
 437         return 0;
 438 }
 439
 440
 441 static struct phy_driver mvswitch_driver = {
 442         .name           = "Marvell 88E6060",
 443         .phy_id         = MVSWITCH_MAGIC,
 444         .phy_id_mask    = 0xffffffff,
 445         .features       = PHY_BASIC_FEATURES,
 446         .probe          = &mvswitch_probe,
 447         .remove         = &mvswitch_remove,
 448         .config_init    = &mvswitch_config_init,
 449         .config_aneg    = &mvswitch_config_aneg,
 450         .read_status    = &mvswitch_read_status,
 451         .driver         = { .owner = THIS_MODULE,},
 452 };
 453
 454 static int __init
 455 mvswitch_init(void)
 456 {
 457         phy_register_fixup_for_id(PHY_ANY_ID, mvswitch_fixup);
 458         return phy_driver_register(&mvswitch_driver);
 459 }
 460
 461 static void __exit
 462 mvswitch_exit(void)
 463 {
 464         phy_driver_unregister(&mvswitch_driver);
 465 }
 466
 467 module_init(mvswitch_init);
 468 module_exit(mvswitch_exit);