drivers/net/fs_enet/fs_enet-mii.c

   1 /*
   2  * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
   3  *
   4  * Copyright (c) 2003 Intracom S.A.
   5  *  by Pantelis Antoniou <panto@intracom.gr>
   6  *
   7  * 2005 (c) MontaVista Software, Inc.
   8  * Vitaly Bordug <vbordug@ru.mvista.com>
   9  *
  10  * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
  11  * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
  12  *
  13  * This file is licensed under the terms of the GNU General Public License
  14  * version 2. This program is licensed "as is" without any warranty of any
  15  * kind, whether express or implied.
  16  */
  17
  18
  19 #include <linux/config.h>
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/kernel.h>
  23 #include <linux/sched.h>
  24 #include <linux/string.h>
  25 #include <linux/ptrace.h>
  26 #include <linux/errno.h>
  27 #include <linux/ioport.h>
  28 #include <linux/slab.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/pci.h>
  31 #include <linux/init.h>
  32 #include <linux/delay.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/mii.h>
  38 #include <linux/ethtool.h>
  39 #include <linux/bitops.h>
  40
  41 #include <asm/pgtable.h>
  42 #include <asm/irq.h>
  43 #include <asm/uaccess.h>
  44
  45 #include "fs_enet.h"
  46
  47 /*************************************************/
  48
  49 /*
  50  * Generic PHY support.
  51  * Should work for all PHYs, but link change is detected by polling
  52  */
  53
  54 static void generic_timer_callback(unsigned long data)
  55 {
  56         struct net_device *dev = (struct net_device *)data;
  57         struct fs_enet_private *fep = netdev_priv(dev);
  58
  59         fep->phy_timer_list.expires = jiffies + HZ / 2;
  60
  61         add_timer(&fep->phy_timer_list);
  62
  63         fs_mii_link_status_change_check(dev, 0);
  64 }
  65
  66 static void generic_startup(struct net_device *dev)
  67 {
  68         struct fs_enet_private *fep = netdev_priv(dev);
  69
  70         fep->phy_timer_list.expires = jiffies + HZ / 2; /* every 500ms */
  71         fep->phy_timer_list.data = (unsigned long)dev;
  72         fep->phy_timer_list.function = generic_timer_callback;
  73         add_timer(&fep->phy_timer_list);
  74 }
  75
  76 static void generic_shutdown(struct net_device *dev)
  77 {
  78         struct fs_enet_private *fep = netdev_priv(dev);
  79
  80         del_timer_sync(&fep->phy_timer_list);
  81 }
  82
  83 /* ------------------------------------------------------------------------- */
  84 /* The Davicom DM9161 is used on the NETTA board                             */
  85
  86 /* register definitions */
  87
  88 #define MII_DM9161_ANAR         4       /* Aux. Config Register         */
  89 #define MII_DM9161_ACR          16      /* Aux. Config Register         */
  90 #define MII_DM9161_ACSR         17      /* Aux. Config/Status Register  */
  91 #define MII_DM9161_10TCSR       18      /* 10BaseT Config/Status Reg.   */
  92 #define MII_DM9161_INTR         21      /* Interrupt Register           */
  93 #define MII_DM9161_RECR         22      /* Receive Error Counter Reg.   */
  94 #define MII_DM9161_DISCR        23      /* Disconnect Counter Register  */
  95
  96 static void dm9161_startup(struct net_device *dev)
  97 {
  98         struct fs_enet_private *fep = netdev_priv(dev);
  99
 100         fs_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0000);
 101         /* Start autonegotiation */
 102         fs_mii_write(dev, fep->mii_if.phy_id, MII_BMCR, 0x1200);
 103
 104         set_current_state(TASK_UNINTERRUPTIBLE);
 105         schedule_timeout(HZ*8);
 106 }
 107
 108 static void dm9161_ack_int(struct net_device *dev)
 109 {
 110         struct fs_enet_private *fep = netdev_priv(dev);
 111
 112         fs_mii_read(dev, fep->mii_if.phy_id, MII_DM9161_INTR);
 113 }
 114
 115 static void dm9161_shutdown(struct net_device *dev)
 116 {
 117         struct fs_enet_private *fep = netdev_priv(dev);
 118
 119         fs_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0f00);
 120 }
 121
 122 /**********************************************************************************/
 123
 124 static const struct phy_info phy_info[] = {
 125         {
 126                 .id = 0x00181b88,
 127                 .name = "DM9161",
 128                 .startup = dm9161_startup,
 129                 .ack_int = dm9161_ack_int,
 130                 .shutdown = dm9161_shutdown,
 131         }, {
 132                 .id = 0,
 133                 .name = "GENERIC",
 134                 .startup = generic_startup,
 135                 .shutdown = generic_shutdown,
 136         },
 137 };
 138
 139 /**********************************************************************************/
 140
 141 static int phy_id_detect(struct net_device *dev)
 142 {
 143         struct fs_enet_private *fep = netdev_priv(dev);
 144         const struct fs_platform_info *fpi = fep->fpi;
 145         struct fs_enet_mii_bus *bus = fep->mii_bus;
 146         int i, r, start, end, phytype, physubtype;
 147         const struct phy_info *phy;
 148         int phy_hwid, phy_id;
 149
 150         phy_hwid = -1;
 151         fep->phy = NULL;
 152
 153         /* auto-detect? */
 154         if (fpi->phy_addr == -1) {
 155                 start = 1;
 156                 end = 32;
 157         } else {                /* direct */
 158                 start = fpi->phy_addr;
 159                 end = start + 1;
 160         }
 161
 162         for (phy_id = start; phy_id < end; phy_id++) {
 163                 /* skip already used phy addresses on this bus */
 164                 if (bus->usage_map & (1 << phy_id))
 165                         continue;
 166                 r = fs_mii_read(dev, phy_id, MII_PHYSID1);
 167                 if (r == -1 || (phytype = (r & 0xffff)) == 0xffff)
 168                         continue;
 169                 r = fs_mii_read(dev, phy_id, MII_PHYSID2);
 170                 if (r == -1 || (physubtype = (r & 0xffff)) == 0xffff)
 171                         continue;
 172                 phy_hwid = (phytype << 16) | physubtype;
 173                 if (phy_hwid != -1)
 174                         break;
 175         }
 176
 177         if (phy_hwid == -1) {
 178                 printk(KERN_ERR DRV_MODULE_NAME
 179                        ": %s No PHY detected! range=0x%02x-0x%02x\n",
 180                         dev->name, start, end);
 181                 return -1;
 182         }
 183
 184         for (i = 0, phy = phy_info; i < ARRAY_SIZE(phy_info); i++, phy++)
 185                 if (phy->id == (phy_hwid >> 4) || phy->id == 0)
 186                         break;
 187
 188         if (i >= ARRAY_SIZE(phy_info)) {
 189                 printk(KERN_ERR DRV_MODULE_NAME
 190                        ": %s PHY id 0x%08x is not supported!\n",
 191                        dev->name, phy_hwid);
 192                 return -1;
 193         }
 194
 195         fep->phy = phy;
 196
 197         /* mark this address as used */
 198         bus->usage_map |= (1 << phy_id);
 199
 200         printk(KERN_INFO DRV_MODULE_NAME
 201                ": %s Phy @ 0x%x, type %s (0x%08x)%s\n",
 202                dev->name, phy_id, fep->phy->name, phy_hwid,
 203                fpi->phy_addr == -1 ? " (auto-detected)" : "");
 204
 205         return phy_id;
 206 }
 207
 208 void fs_mii_startup(struct net_device *dev)
 209 {
 210         struct fs_enet_private *fep = netdev_priv(dev);
 211
 212         if (fep->phy->startup)
 213                 (*fep->phy->startup) (dev);
 214 }
 215
 216 void fs_mii_shutdown(struct net_device *dev)
 217 {
 218         struct fs_enet_private *fep = netdev_priv(dev);
 219
 220         if (fep->phy->shutdown)
 221                 (*fep->phy->shutdown) (dev);
 222 }
 223
 224 void fs_mii_ack_int(struct net_device *dev)
 225 {
 226         struct fs_enet_private *fep = netdev_priv(dev);
 227
 228         if (fep->phy->ack_int)
 229                 (*fep->phy->ack_int) (dev);
 230 }
 231
 232 #define MII_LINK        0x0001
 233 #define MII_HALF        0x0002
 234 #define MII_FULL        0x0004
 235 #define MII_BASE4       0x0008
 236 #define MII_10M         0x0010
 237 #define MII_100M        0x0020
 238 #define MII_1G          0x0040
 239 #define MII_10G         0x0080
 240
 241 /* return full mii info at one gulp, with a usable form */
 242 static unsigned int mii_full_status(struct mii_if_info *mii)
 243 {
 244         unsigned int status;
 245         int bmsr, adv, lpa, neg;
 246         struct fs_enet_private* fep = netdev_priv(mii->dev);
 247
 248         /* first, a dummy read, needed to latch some MII phys */
 249         (void)mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);
 250         bmsr = mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);
 251
 252         /* no link */
 253         if ((bmsr & BMSR_LSTATUS) == 0)
 254                 return 0;
 255
 256         status = MII_LINK;
 257
 258         /* Lets look what ANEG says if it's supported - otherwize we shall
 259            take the right values from the platform info*/
 260         if(!mii->force_media) {
 261                 /* autoneg not completed; don't bother */
 262                 if ((bmsr & BMSR_ANEGCOMPLETE) == 0)
 263                         return 0;
 264
 265                 adv = (*mii->mdio_read)(mii->dev, mii->phy_id, MII_ADVERTISE);
 266                 lpa = (*mii->mdio_read)(mii->dev, mii->phy_id, MII_LPA);
 267
 268                 neg = lpa & adv;
 269         } else {
 270                 neg = fep->fpi->bus_info->lpa;
 271         }
 272
 273         if (neg & LPA_100FULL)
 274                 status |= MII_FULL | MII_100M;
 275         else if (neg & LPA_100BASE4)
 276                 status |= MII_FULL | MII_BASE4 | MII_100M;
 277         else if (neg & LPA_100HALF)
 278                 status |= MII_HALF | MII_100M;
 279         else if (neg & LPA_10FULL)
 280                 status |= MII_FULL | MII_10M;
 281         else
 282                 status |= MII_HALF | MII_10M;
 283
 284         return status;
 285 }
 286
 287 void fs_mii_link_status_change_check(struct net_device *dev, int init_media)
 288 {
 289         struct fs_enet_private *fep = netdev_priv(dev);
 290         struct mii_if_info *mii = &fep->mii_if;
 291         unsigned int mii_status;
 292         int ok_to_print, link, duplex, speed;
 293         unsigned long flags;
 294
 295         ok_to_print = netif_msg_link(fep);
 296
 297         mii_status = mii_full_status(mii);
 298
 299         if (!init_media && mii_status == fep->last_mii_status)
 300                 return;
 301
 302         fep->last_mii_status = mii_status;
 303
 304         link = !!(mii_status & MII_LINK);
 305         duplex = !!(mii_status & MII_FULL);
 306         speed = (mii_status & MII_100M) ? 100 : 10;
 307
 308         if (link == 0) {
 309                 netif_carrier_off(mii->dev);
 310                 netif_stop_queue(dev);
 311                 if (!init_media) {
 312                         spin_lock_irqsave(&fep->lock, flags);
 313                         (*fep->ops->stop)(dev);
 314                         spin_unlock_irqrestore(&fep->lock, flags);
 315                 }
 316
 317                 if (ok_to_print)
 318                         printk(KERN_INFO "%s: link down\n", mii->dev->name);
 319
 320         } else {
 321
 322                 mii->full_duplex = duplex;
 323
 324                 netif_carrier_on(mii->dev);
 325
 326                 spin_lock_irqsave(&fep->lock, flags);
 327                 fep->duplex = duplex;
 328                 fep->speed = speed;
 329                 (*fep->ops->restart)(dev);
 330                 spin_unlock_irqrestore(&fep->lock, flags);
 331
 332                 netif_start_queue(dev);
 333
 334                 if (ok_to_print)
 335                         printk(KERN_INFO "%s: link up, %dMbps, %s-duplex\n",
 336                                dev->name, speed, duplex ? "full" : "half");
 337         }
 338 }
 339
 340 /**********************************************************************************/
 341
 342 int fs_mii_read(struct net_device *dev, int phy_id, int location)
 343 {
 344         struct fs_enet_private *fep = netdev_priv(dev);
 345         struct fs_enet_mii_bus *bus = fep->mii_bus;
 346
 347         unsigned long flags;
 348         int ret;
 349
 350         spin_lock_irqsave(&bus->mii_lock, flags);
 351         ret = (*bus->mii_read)(bus, phy_id, location);
 352         spin_unlock_irqrestore(&bus->mii_lock, flags);
 353
 354         return ret;
 355 }
 356
 357 void fs_mii_write(struct net_device *dev, int phy_id, int location, int value)
 358 {
 359         struct fs_enet_private *fep = netdev_priv(dev);
 360         struct fs_enet_mii_bus *bus = fep->mii_bus;
 361         unsigned long flags;
 362
 363         spin_lock_irqsave(&bus->mii_lock, flags);
 364         (*bus->mii_write)(bus, phy_id, location, value);
 365         spin_unlock_irqrestore(&bus->mii_lock, flags);
 366 }
 367
 368 /*****************************************************************************/
 369
 370 /* list of all registered mii buses */
 371 static LIST_HEAD(fs_mii_bus_list);
 372
 373 static struct fs_enet_mii_bus *lookup_bus(int method, int id)
 374 {
 375         struct list_head *ptr;
 376         struct fs_enet_mii_bus *bus;
 377
 378         list_for_each(ptr, &fs_mii_bus_list) {
 379                 bus = list_entry(ptr, struct fs_enet_mii_bus, list);
 380                 if (bus->bus_info->method == method &&
 381                         bus->bus_info->id == id)
 382                         return bus;
 383         }
 384         return NULL;
 385 }
 386
 387 static struct fs_enet_mii_bus *create_bus(const struct fs_mii_bus_info *bi)
 388 {
 389         struct fs_enet_mii_bus *bus;
 390         int ret = 0;
 391
 392         bus = kmalloc(sizeof(*bus), GFP_KERNEL);
 393         if (bus == NULL) {
 394                 ret = -ENOMEM;
 395                 goto err;
 396         }
 397         memset(bus, 0, sizeof(*bus));
 398         spin_lock_init(&bus->mii_lock);
 399         bus->bus_info = bi;
 400         bus->refs = 0;
 401         bus->usage_map = 0;
 402
 403         /* perform initialization */
 404         switch (bi->method) {
 405
 406                 case fsmii_fixed:
 407                         ret = fs_mii_fixed_init(bus);
 408                         if (ret != 0)
 409                                 goto err;
 410                         break;
 411
 412                 case fsmii_bitbang:
 413                         ret = fs_mii_bitbang_init(bus);
 414                         if (ret != 0)
 415                                 goto err;
 416                         break;
 417 #ifdef CONFIG_FS_ENET_HAS_FEC
 418                 case fsmii_fec:
 419                         ret = fs_mii_fec_init(bus);
 420                         if (ret != 0)
 421                                 goto err;
 422                         break;
 423 #endif
 424                 default:
 425                         ret = -EINVAL;
 426                         goto err;
 427         }
 428
 429         list_add(&bus->list, &fs_mii_bus_list);
 430
 431         return bus;
 432
 433 err:
 434         kfree(bus);
 435         return ERR_PTR(ret);
 436 }
 437
 438 static void destroy_bus(struct fs_enet_mii_bus *bus)
 439 {
 440         /* remove from bus list */
 441         list_del(&bus->list);
 442
 443         /* nothing more needed */
 444         kfree(bus);
 445 }
 446
 447 int fs_mii_connect(struct net_device *dev)
 448 {
 449         struct fs_enet_private *fep = netdev_priv(dev);
 450         const struct fs_platform_info *fpi = fep->fpi;
 451         struct fs_enet_mii_bus *bus = NULL;
 452
 453         /* check method validity */
 454         switch (fpi->bus_info->method) {
 455                 case fsmii_fixed:
 456                 case fsmii_bitbang:
 457                         break;
 458 #ifdef CONFIG_FS_ENET_HAS_FEC
 459                 case fsmii_fec:
 460                         break;
 461 #endif
 462                 default:
 463                         printk(KERN_ERR DRV_MODULE_NAME
 464                                ": %s Unknown MII bus method (%d)!\n",
 465                                dev->name, fpi->bus_info->method);
 466                         return -EINVAL;
 467         }
 468
 469         bus = lookup_bus(fpi->bus_info->method, fpi->bus_info->id);
 470
 471         /* if not found create new bus */
 472         if (bus == NULL) {
 473                 bus = create_bus(fpi->bus_info);
 474                 if (IS_ERR(bus)) {
 475                         printk(KERN_ERR DRV_MODULE_NAME
 476                                ": %s MII bus creation failure!\n", dev->name);
 477                         return PTR_ERR(bus);
 478                 }
 479         }
 480
 481         bus->refs++;
 482
 483         fep->mii_bus = bus;
 484
 485         fep->mii_if.dev = dev;
 486         fep->mii_if.phy_id_mask = 0x1f;
 487         fep->mii_if.reg_num_mask = 0x1f;
 488         fep->mii_if.mdio_read = fs_mii_read;
 489         fep->mii_if.mdio_write = fs_mii_write;
 490         fep->mii_if.force_media = fpi->bus_info->disable_aneg;
 491         fep->mii_if.phy_id = phy_id_detect(dev);
 492
 493         return 0;
 494 }
 495
 496 void fs_mii_disconnect(struct net_device *dev)
 497 {
 498         struct fs_enet_private *fep = netdev_priv(dev);
 499         struct fs_enet_mii_bus *bus = NULL;
 500
 501         bus = fep->mii_bus;
 502         fep->mii_bus = NULL;
 503
 504         if (--bus->refs <= 0)
 505                 destroy_bus(bus);
 506 }