target/linux/generic-2.6/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 MODULE_DESCRIPTION("Marvell 88E6060 Switch driver");
  34 MODULE_AUTHOR("Felix Fietkau");
  35 MODULE_LICENSE("GPL");
  36
  37 struct mvswitch_priv {
  38         /* the driver's tx function */
  39         int (*hardstart)(struct sk_buff *skb, struct net_device *dev);
  40         struct vlan_group *grp;
  41         u8 vlans[16];
  42 };
  43
  44 #define to_mvsw(_phy) ((struct mvswitch_priv *) (_phy)->priv)
  45
  46 static inline u16
  47 r16(struct phy_device *phydev, int addr, int reg)
  48 {
  49         return phydev->bus->read(phydev->bus, addr, reg);
  50 }
  51
  52 static inline void
  53 w16(struct phy_device *phydev, int addr, int reg, u16 val)
  54 {
  55         phydev->bus->write(phydev->bus, addr, reg, val);
  56 }
  57
  58 static int
  59 mvswitch_mangle_tx(struct sk_buff *skb, struct net_device *dev)
  60 {
  61         struct mvswitch_priv *priv;
  62         struct vlan_ethhdr *eh;
  63         char *buf = NULL;
  64         u16 vid;
  65
  66         priv = dev->phy_ptr;
  67         if (unlikely(!priv))
  68                 goto error;
  69
  70         if (unlikely(skb->len < 16))
  71                 goto error;
  72
  73         eh = (struct vlan_ethhdr *) skb->data;
  74         if (be16_to_cpu(eh->h_vlan_proto) != 0x8100)
  75                 goto error;
  76
  77         vid = be16_to_cpu(eh->h_vlan_TCI) & VLAN_VID_MASK;
  78         if (unlikely((vid > 15 || !priv->vlans[vid])))
  79                 goto error;
  80
  81         if (skb->len <= 64) {
  82                 if (pskb_expand_head(skb, 0, 68 - skb->len, GFP_ATOMIC)) {
  83                         if (net_ratelimit())
  84                                 printk("%s: failed to expand/update skb for the switch\n", dev->name);
  85                         goto error;
  86                 }
  87
  88                 buf = skb->data + 64;
  89                 skb->len = 68;
  90         } else {
  91                 if (skb_cloned(skb) || unlikely(skb_tailroom(skb) < 4)) {
  92                         if (pskb_expand_head(skb, 0, 4, GFP_ATOMIC)) {
  93                                 if (net_ratelimit())
  94                                         printk("%s: failed to expand/update skb for the switch\n", dev->name);
  95                                 goto error;
  96                         }
  97                 }
  98                 buf = skb_put(skb, 4);
  99         }
 100
 101         /* move the ethernet header 4 bytes forward, overwriting the vlan tag */
 102         memmove(skb->data + 4, skb->data, 12);
 103         skb->data += 4;
 104         skb->len -= 4;
 105         skb->mac_header += 4;
 106
 107         if (!buf)
 108                 goto error;
 109
 110         /* append the tag */
 111         *((u32 *) buf) = (
 112                 (0x80 << 24) |
 113                 ((priv->vlans[vid] & 0x1f) << 16)
 114         );
 115
 116         return priv->hardstart(skb, dev);
 117
 118 error:
 119         /* any errors? drop the packet! */
 120         dev_kfree_skb_any(skb);
 121         return 0;
 122 }
 123
 124 static int
 125 mvswitch_mangle_rx(struct sk_buff *skb, int napi)
 126 {
 127         struct mvswitch_priv *priv;
 128         struct net_device *dev;
 129         int vlan = -1;
 130         unsigned char *buf;
 131         int i;
 132
 133         dev = skb->dev;
 134         if (!dev)
 135                 goto error;
 136
 137         priv = dev->phy_ptr;
 138         if (!priv)
 139                 goto error;
 140
 141         if (!priv->grp)
 142                 goto error;
 143
 144         buf = skb->data + skb->len - 4;
 145         if (buf[0] != 0x80)
 146                 goto error;
 147
 148         /* look for the vlan matching the incoming port */
 149         for (i = 0; i < ARRAY_SIZE(priv->vlans); i++) {
 150                 if ((1 << buf[1]) & priv->vlans[i])
 151                         vlan = i;
 152         }
 153
 154         if (vlan == -1)
 155                 goto error;
 156
 157         if (napi)
 158                 return vlan_hwaccel_receive_skb(skb, priv->grp, vlan);
 159         else
 160                 return vlan_hwaccel_rx(skb, priv->grp, vlan);
 161
 162 error:
 163         /* no vlan? eat the packet! */
 164         dev_kfree_skb_any(skb);
 165         return 0;
 166 }
 167
 168
 169 static int
 170 mvswitch_netif_rx(struct sk_buff *skb)
 171 {
 172         return mvswitch_mangle_rx(skb, 0);
 173 }
 174
 175 static int
 176 mvswitch_netif_receive_skb(struct sk_buff *skb)
 177 {
 178         return mvswitch_mangle_rx(skb, 1);
 179 }
 180
 181
 182 static void
 183 mvswitch_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
 184 {
 185         struct mvswitch_priv *priv = dev->phy_ptr;
 186         priv->grp = grp;
 187 }
 188
 189
 190 static int
 191 mvswitch_config_init(struct phy_device *pdev)
 192 {
 193         struct mvswitch_priv *priv = to_mvsw(pdev);
 194         struct net_device *dev = pdev->attached_dev;
 195         u8 vlmap = 0;
 196         int i;
 197
 198         if (!dev)
 199                 return -EINVAL;
 200
 201         printk("%s: Marvell 88E6060 PHY driver attached.\n", dev->name);
 202         pdev->supported = ADVERTISED_100baseT_Full;
 203         pdev->advertising = ADVERTISED_100baseT_Full;
 204         dev->phy_ptr = priv;
 205
 206         /* initialize default vlans */
 207         for (i = 0; i < MV_PORTS; i++)
 208                 priv->vlans[(i == MV_WANPORT ? 1 : 0)] |= (1 << i);
 209
 210         /* before entering reset, disable all ports */
 211         for (i = 0; i < MV_PORTS; i++)
 212                 w16(pdev, MV_PORTREG(CONTROL, i), 0x00);
 213
 214         msleep(2); /* wait for the status change to settle in */
 215
 216         /* put the device in reset and set ATU flags */
 217         w16(pdev, MV_SWITCHREG(ATU_CTRL),
 218                 MV_ATUCTL_RESET |
 219                 MV_ATUCTL_ATU_1K |
 220                 MV_ATUCTL_AGETIME(4080) /* maximum */
 221         );
 222
 223         i = 100; /* timeout */
 224         do {
 225                 if (!(r16(pdev, MV_SWITCHREG(ATU_CTRL)) & MV_ATUCTL_RESET))
 226                         break;
 227                 msleep(1);
 228         } while (--i > 0);
 229
 230         if (!i) {
 231                 printk("%s: Timeout waiting for the switch to reset.\n", dev->name);
 232                 return -ETIMEDOUT;
 233         }
 234
 235         /* initialize the cpu port */
 236         w16(pdev, MV_PORTREG(CONTROL, MV_CPUPORT),
 237                 MV_PORTCTRL_ENABLED |
 238                 MV_PORTCTRL_VLANTUN |
 239                 MV_PORTCTRL_RXTR |
 240                 MV_PORTCTRL_TXTR
 241         );
 242         /* wait for the phy change to settle in */
 243         msleep(2);
 244         for (i = 0; i < MV_PORTS; i++) {
 245                 u8 pvid = 0;
 246                 int j;
 247
 248                 vlmap = 0;
 249
 250                 /* look for the matching vlan */
 251                 for (j = 0; j < ARRAY_SIZE(priv->vlans); j++) {
 252                         if (priv->vlans[j] & (1 << i)) {
 253                                 vlmap = priv->vlans[j];
 254                                 pvid = j;
 255                         }
 256                 }
 257                 /* leave port unconfigured if it's not part of a vlan */
 258                 if (!vlmap)
 259                         break;
 260
 261                 /* add the cpu port to the allowed destinations list */
 262                 vlmap |= (1 << MV_CPUPORT);
 263
 264                 /* take port out of its own vlan destination map */
 265                 vlmap &= ~(1 << i);
 266
 267                 /* apply vlan settings */
 268                 w16(pdev, MV_PORTREG(VLANMAP, i),
 269                         MV_PORTVLAN_PORTS(vlmap) |
 270                         MV_PORTVLAN_ID(pvid)
 271                 );
 272
 273                 /* re-enable port */
 274                 w16(pdev, MV_PORTREG(CONTROL, i), MV_PORTCTRL_ENABLED);
 275         }
 276
 277         /* build the target list for the cpu port */
 278         for (i = 0, vlmap = 0; i < ARRAY_SIZE(priv->vlans); i++)
 279                 vlmap |= priv->vlans[i];
 280
 281         w16(pdev, MV_PORTREG(VLANMAP, MV_CPUPORT),
 282                 MV_PORTVLAN_PORTS(vlmap)
 283         );
 284
 285         /* set the port association vector */
 286         for (i = 0; i <= MV_PORTS; i++) {
 287                 w16(pdev, MV_PORTREG(ASSOC, i),
 288                         MV_PORTASSOC_PORTS(1 << i)
 289                 );
 290         }
 291
 292         /* hook into the tx function */
 293         priv->hardstart = dev->hard_start_xmit;
 294         pdev->netif_receive_skb = mvswitch_netif_receive_skb;
 295         pdev->netif_rx = mvswitch_netif_rx;
 296         dev->hard_start_xmit = mvswitch_mangle_tx;
 297         dev->vlan_rx_register = mvswitch_vlan_rx_register;
 298         dev->features |= NETIF_F_HW_VLAN_RX;
 299
 300         return 0;
 301 }
 302
 303 static int
 304 mvswitch_read_status(struct phy_device *phydev)
 305 {
 306         phydev->speed = SPEED_100;
 307         phydev->duplex = DUPLEX_FULL;
 308         phydev->state = PHY_UP;
 309         return 0;
 310 }
 311
 312 static int
 313 mvswitch_config_aneg(struct phy_device *phydev)
 314 {
 315         return 0;
 316 }
 317
 318 static void
 319 mvswitch_remove(struct phy_device *pdev)
 320 {
 321         struct mvswitch_priv *priv = to_mvsw(pdev);
 322         struct net_device *dev = pdev->attached_dev;
 323
 324         /* restore old xmit handler */
 325         if (priv->hardstart && dev)
 326                 dev->hard_start_xmit = priv->hardstart;
 327         dev->vlan_rx_register = NULL;
 328         dev->vlan_rx_kill_vid = NULL;
 329         dev->phy_ptr = NULL;
 330         dev->features &= ~NETIF_F_HW_VLAN_RX;
 331         kfree(priv);
 332 }
 333
 334 static bool
 335 mvswitch_detect(struct mii_bus *bus, int addr)
 336 {
 337         u16 reg;
 338         int i;
 339
 340         /* we attach to phy id 31 to make sure that the late probe works */
 341         if (addr != 31)
 342                 return false;
 343
 344         /* look for the switch on the bus */
 345         reg = bus->read(bus, MV_PORTREG(IDENT, 0)) & MV_IDENT_MASK;
 346         if (reg != MV_IDENT_VALUE)
 347                 return false;
 348
 349         /*
 350          * Now that we've established that the switch actually exists, let's
 351          * get rid of the competition :)
 352          */
 353         for (i = 0; i < 31; i++) {
 354                 if (!bus->phy_map[i])
 355                         continue;
 356
 357                 device_unregister(&bus->phy_map[i]->dev);
 358                 kfree(bus->phy_map[i]);
 359                 bus->phy_map[i] = NULL;
 360         }
 361
 362         return true;
 363 }
 364
 365 static int
 366 mvswitch_probe(struct phy_device *pdev)
 367 {
 368         struct mvswitch_priv *priv;
 369
 370         priv = kzalloc(sizeof(struct mvswitch_priv), GFP_KERNEL);
 371         if (priv == NULL)
 372                 return -ENOMEM;
 373
 374         pdev->priv = priv;
 375
 376         return 0;
 377 }
 378
 379
 380 static struct phy_driver mvswitch_driver = {
 381         .name           = "Marvell 88E6060",
 382         .features       = PHY_BASIC_FEATURES,
 383         .detect         = &mvswitch_detect,
 384         .probe          = &mvswitch_probe,
 385         .remove         = &mvswitch_remove,
 386         .config_init    = &mvswitch_config_init,
 387         .config_aneg    = &mvswitch_config_aneg,
 388         .read_status    = &mvswitch_read_status,
 389         .driver         = { .owner = THIS_MODULE,},
 390 };
 391
 392 static int __init
 393 mvswitch_init(void)
 394 {
 395         return phy_driver_register(&mvswitch_driver);
 396 }
 397
 398 static void __exit
 399 mvswitch_exit(void)
 400 {
 401         phy_driver_unregister(&mvswitch_driver);
 402 }
 403
 404 module_init(mvswitch_init);
 405 module_exit(mvswitch_exit);