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 /* 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 struct mvswitch_priv {
  42         /* the driver's tx function */
  43         int (*hardstart)(struct sk_buff *skb, struct net_device *dev);
  44         struct vlan_group *grp;
  45         u8 vlans[16];
  46 };
  47
  48 #define to_mvsw(_phy) ((struct mvswitch_priv *) (_phy)->priv)
  49
  50 static inline u16
  51 r16(struct phy_device *phydev, int addr, int reg)
  52 {
  53         return phydev->bus->read(phydev->bus, addr, reg);
  54 }
  55
  56 static inline void
  57 w16(struct phy_device *phydev, int addr, int reg, u16 val)
  58 {
  59         phydev->bus->write(phydev->bus, addr, reg, val);
  60 }
  61
  62
  63 static int
  64 mvswitch_mangle_tx(struct sk_buff *skb, struct net_device *dev)
  65 {
  66         struct mvswitch_priv *priv;
  67         char *buf = NULL;
  68         u16 vid;
  69
  70         priv = dev->phy_ptr;
  71         if (unlikely(!priv))
  72                 goto error;
  73
  74         if (unlikely(skb->len < 16))
  75                 goto error;
  76
  77 #ifdef HEADER_MODE
  78         if (__vlan_hwaccel_get_tag(skb, &vid))
  79                 goto error;
  80
  81         if ((skb->len <= 62) || (skb_headroom(skb) < MV_HEADER_SIZE)) {
  82                 if (pskb_expand_head(skb, MV_HEADER_SIZE, 0, GFP_ATOMIC))
  83                         goto error_expand;
  84                 if (skb->len < 62)
  85                         skb->len = 62;
  86         }
  87         buf = skb_push(skb, MV_HEADER_SIZE);
  88 #else
  89         if (__vlan_get_tag(skb, &vid))
  90                 goto error;
  91
  92         if (unlikely((vid > 15 || !priv->vlans[vid])))
  93                 goto error;
  94
  95         if (skb->len <= 64) {
  96                 if (pskb_expand_head(skb, 0, 64 + MV_TRAILER_SIZE - skb->len, GFP_ATOMIC))
  97                         goto error_expand;
  98
  99                 buf = skb->data + 64;
 100                 skb->len = 64 + MV_TRAILER_SIZE;
 101         } else {
 102                 if (skb_cloned(skb) || unlikely(skb_tailroom(skb) < 4)) {
 103                         if (pskb_expand_head(skb, 0, 4, GFP_ATOMIC))
 104                                 goto error_expand;
 105                 }
 106                 buf = skb_put(skb, 4);
 107         }
 108
 109         /* move the ethernet header 4 bytes forward, overwriting the vlan tag */
 110         memmove(skb->data + 4, skb->data, 12);
 111         skb->data += 4;
 112         skb->len -= 4;
 113         skb->mac_header += 4;
 114 #endif
 115
 116         if (!buf)
 117                 goto error;
 118
 119
 120 #ifdef HEADER_MODE
 121         /* prepend the tag */
 122         *((__be16 *) buf) = cpu_to_be16(
 123                 ((vid << MV_HEADER_VLAN_S) & MV_HEADER_VLAN_M) |
 124                 ((priv->vlans[vid] << MV_HEADER_PORTS_S) & MV_HEADER_PORTS_M)
 125         );
 126 #else
 127         /* append the tag */
 128         *((__be32 *) buf) = cpu_to_be32((
 129                 (MV_TRAILER_OVERRIDE << MV_TRAILER_FLAGS_S) |
 130                 ((priv->vlans[vid] & MV_TRAILER_PORTS_M) << MV_TRAILER_PORTS_S)
 131         ));
 132 #endif
 133
 134         return priv->hardstart(skb, dev);
 135
 136 error_expand:
 137         if (net_ratelimit())
 138                 printk("%s: failed to expand/update skb for the switch\n", dev->name);
 139
 140 error:
 141         /* any errors? drop the packet! */
 142         dev_kfree_skb_any(skb);
 143         return 0;
 144 }
 145
 146 static int
 147 mvswitch_mangle_rx(struct sk_buff *skb, int napi)
 148 {
 149         struct mvswitch_priv *priv;
 150         struct net_device *dev;
 151         int vlan = -1;
 152         unsigned char *buf;
 153         int i;
 154
 155         dev = skb->dev;
 156         if (!dev)
 157                 goto error;
 158
 159         priv = dev->phy_ptr;
 160         if (!priv)
 161                 goto error;
 162
 163         if (!priv->grp)
 164                 goto error;
 165
 166 #ifdef HEADER_MODE
 167         buf = skb->data;
 168         skb_pull(skb, MV_HEADER_SIZE);
 169 #else
 170         buf = skb->data + skb->len - MV_TRAILER_SIZE;
 171         if (buf[0] != 0x80)
 172                 goto error;
 173 #endif
 174
 175         /* look for the vlan matching the incoming port */
 176         for (i = 0; i < ARRAY_SIZE(priv->vlans); i++) {
 177                 if ((1 << buf[1]) & priv->vlans[i])
 178                         vlan = i;
 179         }
 180
 181         if (vlan == -1)
 182                 goto error;
 183
 184         skb->protocol = eth_type_trans(skb, skb->dev);
 185
 186         if (napi)
 187                 return vlan_hwaccel_receive_skb(skb, priv->grp, vlan);
 188         else
 189                 return vlan_hwaccel_rx(skb, priv->grp, vlan);
 190
 191 error:
 192         /* no vlan? eat the packet! */
 193         dev_kfree_skb_any(skb);
 194         return 0;
 195 }
 196
 197
 198 static int
 199 mvswitch_netif_rx(struct sk_buff *skb)
 200 {
 201         return mvswitch_mangle_rx(skb, 0);
 202 }
 203
 204 static int
 205 mvswitch_netif_receive_skb(struct sk_buff *skb)
 206 {
 207         return mvswitch_mangle_rx(skb, 1);
 208 }
 209
 210
 211 static void
 212 mvswitch_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
 213 {
 214         struct mvswitch_priv *priv = dev->phy_ptr;
 215         priv->grp = grp;
 216 }
 217
 218
 219 static int
 220 mvswitch_config_init(struct phy_device *pdev)
 221 {
 222         struct mvswitch_priv *priv = to_mvsw(pdev);
 223         struct net_device *dev = pdev->attached_dev;
 224         u8 vlmap = 0;
 225         int i;
 226
 227         if (!dev)
 228                 return -EINVAL;
 229
 230         printk("%s: Marvell 88E6060 PHY driver attached.\n", dev->name);
 231         pdev->supported = ADVERTISED_100baseT_Full;
 232         pdev->advertising = ADVERTISED_100baseT_Full;
 233         dev->phy_ptr = priv;
 234
 235         /* initialize default vlans */
 236         for (i = 0; i < MV_PORTS; i++)
 237                 priv->vlans[(i == MV_WANPORT ? 1 : 0)] |= (1 << i);
 238
 239         /* before entering reset, disable all ports */
 240         for (i = 0; i < MV_PORTS; i++)
 241                 w16(pdev, MV_PORTREG(CONTROL, i), 0x00);
 242
 243         msleep(2); /* wait for the status change to settle in */
 244
 245         /* put the device in reset and set ATU flags */
 246         w16(pdev, MV_SWITCHREG(ATU_CTRL),
 247                 MV_ATUCTL_RESET |
 248                 MV_ATUCTL_ATU_1K |
 249                 MV_ATUCTL_AGETIME(MV_ATUCTL_AGETIME_MIN) /* minimum without disabling ageing */
 250         );
 251
 252         i = 100; /* timeout */
 253         do {
 254                 if (!(r16(pdev, MV_SWITCHREG(ATU_CTRL)) & MV_ATUCTL_RESET))
 255                         break;
 256                 msleep(1);
 257         } while (--i > 0);
 258
 259         if (!i) {
 260                 printk("%s: Timeout waiting for the switch to reset.\n", dev->name);
 261                 return -ETIMEDOUT;
 262         }
 263
 264         /* initialize the cpu port */
 265         w16(pdev, MV_PORTREG(CONTROL, MV_CPUPORT),
 266 #ifdef HEADER_MODE
 267                 MV_PORTCTRL_HEADER |
 268 #else
 269                 MV_PORTCTRL_RXTR |
 270                 MV_PORTCTRL_TXTR |
 271 #endif
 272                 MV_PORTCTRL_ENABLED
 273         );
 274         /* wait for the phy change to settle in */
 275         msleep(2);
 276         for (i = 0; i < MV_PORTS; i++) {
 277                 u8 pvid = 0;
 278                 int j;
 279
 280                 vlmap = 0;
 281
 282                 /* look for the matching vlan */
 283                 for (j = 0; j < ARRAY_SIZE(priv->vlans); j++) {
 284                         if (priv->vlans[j] & (1 << i)) {
 285                                 vlmap = priv->vlans[j];
 286                                 pvid = j;
 287                         }
 288                 }
 289                 /* leave port unconfigured if it's not part of a vlan */
 290                 if (!vlmap)
 291                         break;
 292
 293                 /* add the cpu port to the allowed destinations list */
 294                 vlmap |= (1 << MV_CPUPORT);
 295
 296                 /* take port out of its own vlan destination map */
 297                 vlmap &= ~(1 << i);
 298
 299                 /* apply vlan settings */
 300                 w16(pdev, MV_PORTREG(VLANMAP, i),
 301                         MV_PORTVLAN_PORTS(vlmap) |
 302                         MV_PORTVLAN_ID(pvid)
 303                 );
 304
 305                 /* re-enable port */
 306                 w16(pdev, MV_PORTREG(CONTROL, i), MV_PORTCTRL_ENABLED);
 307         }
 308
 309         /* build the target list for the cpu port */
 310         for (i = 0; i < MV_PORTS; i++)
 311                 vlmap |= (1 << i);
 312
 313         w16(pdev, MV_PORTREG(VLANMAP, MV_CPUPORT),
 314                 MV_PORTVLAN_PORTS(vlmap)
 315         );
 316
 317         /* set the port association vector */
 318         for (i = 0; i <= MV_PORTS; i++) {
 319                 w16(pdev, MV_PORTREG(ASSOC, i),
 320                         MV_PORTASSOC_PORTS(1 << i)
 321                 );
 322         }
 323
 324         /* init switch control */
 325         w16(pdev, MV_SWITCHREG(CTRL),
 326                 MV_SWITCHCTL_MSIZE |
 327                 MV_SWITCHCTL_DROP
 328         );
 329
 330         /* hook into the tx function */
 331         priv->hardstart = dev->hard_start_xmit;
 332         pdev->netif_receive_skb = mvswitch_netif_receive_skb;
 333         pdev->netif_rx = mvswitch_netif_rx;
 334         dev->hard_start_xmit = mvswitch_mangle_tx;
 335         dev->vlan_rx_register = mvswitch_vlan_rx_register;
 336 #ifdef HEADER_MODE
 337         dev->features |= NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX;
 338 #else
 339         dev->features |= NETIF_F_HW_VLAN_RX;
 340 #endif
 341
 342         return 0;
 343 }
 344
 345 static int
 346 mvswitch_read_status(struct phy_device *phydev)
 347 {
 348         phydev->speed = SPEED_100;
 349         phydev->duplex = DUPLEX_FULL;
 350         phydev->state = PHY_UP;
 351         return 0;
 352 }
 353
 354 static int
 355 mvswitch_config_aneg(struct phy_device *phydev)
 356 {
 357         return 0;
 358 }
 359
 360 static void
 361 mvswitch_remove(struct phy_device *pdev)
 362 {
 363         struct mvswitch_priv *priv = to_mvsw(pdev);
 364         struct net_device *dev = pdev->attached_dev;
 365
 366         /* restore old xmit handler */
 367         if (priv->hardstart && dev)
 368                 dev->hard_start_xmit = priv->hardstart;
 369         dev->vlan_rx_register = NULL;
 370         dev->vlan_rx_kill_vid = NULL;
 371         dev->phy_ptr = NULL;
 372         dev->features &= ~NETIF_F_HW_VLAN_RX;
 373         kfree(priv);
 374 }
 375
 376 static bool
 377 mvswitch_detect(struct mii_bus *bus, int addr)
 378 {
 379         u16 reg;
 380         int i;
 381
 382         /* we attach to phy id 31 to make sure that the late probe works */
 383         if (addr != 31)
 384                 return false;
 385
 386         /* look for the switch on the bus */
 387         reg = bus->read(bus, MV_PORTREG(IDENT, 0)) & MV_IDENT_MASK;
 388         if (reg != MV_IDENT_VALUE)
 389                 return false;
 390
 391         /*
 392          * Now that we've established that the switch actually exists, let's
 393          * get rid of the competition :)
 394          */
 395         for (i = 0; i < 31; i++) {
 396                 if (!bus->phy_map[i])
 397                         continue;
 398
 399                 device_unregister(&bus->phy_map[i]->dev);
 400                 kfree(bus->phy_map[i]);
 401                 bus->phy_map[i] = NULL;
 402         }
 403
 404         return true;
 405 }
 406
 407 static int
 408 mvswitch_probe(struct phy_device *pdev)
 409 {
 410         struct mvswitch_priv *priv;
 411
 412         priv = kzalloc(sizeof(struct mvswitch_priv), GFP_KERNEL);
 413         if (priv == NULL)
 414                 return -ENOMEM;
 415
 416         pdev->priv = priv;
 417
 418         return 0;
 419 }
 420
 421
 422 static struct phy_driver mvswitch_driver = {
 423         .name           = "Marvell 88E6060",
 424         .features       = PHY_BASIC_FEATURES,
 425         .detect         = &mvswitch_detect,
 426         .probe          = &mvswitch_probe,
 427         .remove         = &mvswitch_remove,
 428         .config_init    = &mvswitch_config_init,
 429         .config_aneg    = &mvswitch_config_aneg,
 430         .read_status    = &mvswitch_read_status,
 431         .driver         = { .owner = THIS_MODULE,},
 432 };
 433
 434 static int __init
 435 mvswitch_init(void)
 436 {
 437         return phy_driver_register(&mvswitch_driver);
 438 }
 439
 440 static void __exit
 441 mvswitch_exit(void)
 442 {
 443         phy_driver_unregister(&mvswitch_driver);
 444 }
 445
 446 module_init(mvswitch_init);
 447 module_exit(mvswitch_exit);