drivers/net/fec_8xx/fec_mii.c

   1 /*
   2  * Fast Ethernet Controller (FEC) driver for Motorola MPC8xx.
   3  *
   4  * Copyright (c) 2003 Intracom S.A.
   5  *  by Pantelis Antoniou <panto@intracom.gr>
   6  *
   7  * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
   8  * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
   9  *
  10  * Released under the GPL
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/string.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/errno.h>
  19 #include <linux/ioport.h>
  20 #include <linux/slab.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/init.h>
  23 #include <linux/delay.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/mii.h>
  29 #include <linux/ethtool.h>
  30 #include <linux/bitops.h>
  31
  32 #include <asm/8xx_immap.h>
  33 #include <asm/pgtable.h>
  34 #include <asm/mpc8xx.h>
  35 #include <asm/irq.h>
  36 #include <asm/uaccess.h>
  37 #include <asm/commproc.h>
  38
  39 /*************************************************/
  40
  41 #include "fec_8xx.h"
  42
  43 /*************************************************/
  44
  45 /* Make MII read/write commands for the FEC.
  46 */
  47 #define mk_mii_read(REG)        (0x60020000 | ((REG & 0x1f) << 18))
  48 #define mk_mii_write(REG, VAL)  (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
  49 #define mk_mii_end              0
  50
  51 /*************************************************/
  52
  53 /* XXX both FECs use the MII interface of FEC1 */
  54 static DEFINE_SPINLOCK(fec_mii_lock);
  55
  56 #define FEC_MII_LOOPS   10000
  57
  58 int fec_mii_read(struct net_device *dev, int phy_id, int location)
  59 {
  60         struct fec_enet_private *fep = netdev_priv(dev);
  61         fec_t *fecp;
  62         int i, ret = -1;
  63         unsigned long flags;
  64
  65         /* XXX MII interface is only connected to FEC1 */
  66         fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
  67
  68         spin_lock_irqsave(&fec_mii_lock, flags);
  69
  70         if ((FR(fecp, r_cntrl) & FEC_RCNTRL_MII_MODE) == 0) {
  71                 FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
  72                 FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
  73                 FW(fecp, ievent, FEC_ENET_MII);
  74         }
  75
  76         /* Add PHY address to register command.  */
  77         FW(fecp, mii_speed, fep->fec_phy_speed);
  78         FW(fecp, mii_data, (phy_id << 23) | mk_mii_read(location));
  79
  80         for (i = 0; i < FEC_MII_LOOPS; i++)
  81                 if ((FR(fecp, ievent) & FEC_ENET_MII) != 0)
  82                         break;
  83
  84         if (i < FEC_MII_LOOPS) {
  85                 FW(fecp, ievent, FEC_ENET_MII);
  86                 ret = FR(fecp, mii_data) & 0xffff;
  87         }
  88
  89         spin_unlock_irqrestore(&fec_mii_lock, flags);
  90
  91         return ret;
  92 }
  93
  94 void fec_mii_write(struct net_device *dev, int phy_id, int location, int value)
  95 {
  96         struct fec_enet_private *fep = netdev_priv(dev);
  97         fec_t *fecp;
  98         unsigned long flags;
  99         int i;
 100
 101         /* XXX MII interface is only connected to FEC1 */
 102         fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
 103
 104         spin_lock_irqsave(&fec_mii_lock, flags);
 105
 106         if ((FR(fecp, r_cntrl) & FEC_RCNTRL_MII_MODE) == 0) {
 107                 FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
 108                 FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
 109                 FW(fecp, ievent, FEC_ENET_MII);
 110         }
 111
 112         /* Add PHY address to register command.  */
 113         FW(fecp, mii_speed, fep->fec_phy_speed);        /* always adapt mii speed */
 114         FW(fecp, mii_data, (phy_id << 23) | mk_mii_write(location, value));
 115
 116         for (i = 0; i < FEC_MII_LOOPS; i++)
 117                 if ((FR(fecp, ievent) & FEC_ENET_MII) != 0)
 118                         break;
 119
 120         if (i < FEC_MII_LOOPS)
 121                 FW(fecp, ievent, FEC_ENET_MII);
 122
 123         spin_unlock_irqrestore(&fec_mii_lock, flags);
 124 }
 125
 126 /*************************************************/
 127
 128 #ifdef CONFIG_FEC_8XX_GENERIC_PHY
 129
 130 /*
 131  * Generic PHY support.
 132  * Should work for all PHYs, but link change is detected by polling
 133  */
 134
 135 static void generic_timer_callback(unsigned long data)
 136 {
 137         struct net_device *dev = (struct net_device *)data;
 138         struct fec_enet_private *fep = netdev_priv(dev);
 139
 140         fep->phy_timer_list.expires = jiffies + HZ / 2;
 141
 142         add_timer(&fep->phy_timer_list);
 143
 144         fec_mii_link_status_change_check(dev, 0);
 145 }
 146
 147 static void generic_startup(struct net_device *dev)
 148 {
 149         struct fec_enet_private *fep = netdev_priv(dev);
 150
 151         fep->phy_timer_list.expires = jiffies + HZ / 2; /* every 500ms */
 152         fep->phy_timer_list.data = (unsigned long)dev;
 153         fep->phy_timer_list.function = generic_timer_callback;
 154         add_timer(&fep->phy_timer_list);
 155 }
 156
 157 static void generic_shutdown(struct net_device *dev)
 158 {
 159         struct fec_enet_private *fep = netdev_priv(dev);
 160
 161         del_timer_sync(&fep->phy_timer_list);
 162 }
 163
 164 #endif
 165
 166 #ifdef CONFIG_FEC_8XX_DM9161_PHY
 167
 168 /* ------------------------------------------------------------------------- */
 169 /* The Davicom DM9161 is used on the NETTA board                             */
 170
 171 /* register definitions */
 172
 173 #define MII_DM9161_ACR          16      /* Aux. Config Register         */
 174 #define MII_DM9161_ACSR         17      /* Aux. Config/Status Register  */
 175 #define MII_DM9161_10TCSR       18      /* 10BaseT Config/Status Reg.   */
 176 #define MII_DM9161_INTR         21      /* Interrupt Register           */
 177 #define MII_DM9161_RECR         22      /* Receive Error Counter Reg.   */
 178 #define MII_DM9161_DISCR        23      /* Disconnect Counter Register  */
 179
 180 static void dm9161_startup(struct net_device *dev)
 181 {
 182         struct fec_enet_private *fep = netdev_priv(dev);
 183
 184         fec_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0000);
 185 }
 186
 187 static void dm9161_ack_int(struct net_device *dev)
 188 {
 189         struct fec_enet_private *fep = netdev_priv(dev);
 190
 191         fec_mii_read(dev, fep->mii_if.phy_id, MII_DM9161_INTR);
 192 }
 193
 194 static void dm9161_shutdown(struct net_device *dev)
 195 {
 196         struct fec_enet_private *fep = netdev_priv(dev);
 197
 198         fec_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0f00);
 199 }
 200
 201 #endif
 202
 203 #ifdef CONFIG_FEC_8XX_LXT971_PHY
 204
 205 /* Support for LXT971/972 PHY */
 206
 207 #define MII_LXT971_PCR          16 /* Port Control Register */
 208 #define MII_LXT971_SR2          17 /* Status Register 2 */
 209 #define MII_LXT971_IER          18 /* Interrupt Enable Register */
 210 #define MII_LXT971_ISR          19 /* Interrupt Status Register */
 211 #define MII_LXT971_LCR          20 /* LED Control Register */
 212 #define MII_LXT971_TCR          30 /* Transmit Control Register */
 213
 214 static void lxt971_startup(struct net_device *dev)
 215 {
 216         struct fec_enet_private *fep = netdev_priv(dev);
 217
 218         fec_mii_write(dev, fep->mii_if.phy_id, MII_LXT971_IER, 0x00F2);
 219 }
 220
 221 static void lxt971_ack_int(struct net_device *dev)
 222 {
 223         struct fec_enet_private *fep = netdev_priv(dev);
 224
 225         fec_mii_read(dev, fep->mii_if.phy_id, MII_LXT971_ISR);
 226 }
 227
 228 static void lxt971_shutdown(struct net_device *dev)
 229 {
 230         struct fec_enet_private *fep = netdev_priv(dev);
 231
 232         fec_mii_write(dev, fep->mii_if.phy_id, MII_LXT971_IER, 0x0000);
 233 }
 234 #endif
 235
 236 /**********************************************************************************/
 237
 238 static const struct phy_info phy_info[] = {
 239 #ifdef CONFIG_FEC_8XX_DM9161_PHY
 240         {
 241          .id = 0x00181b88,
 242          .name = "DM9161",
 243          .startup = dm9161_startup,
 244          .ack_int = dm9161_ack_int,
 245          .shutdown = dm9161_shutdown,
 246          },
 247 #endif
 248 #ifdef CONFIG_FEC_8XX_LXT971_PHY
 249         {
 250          .id = 0x0001378e,
 251          .name = "LXT971/972",
 252          .startup = lxt971_startup,
 253          .ack_int = lxt971_ack_int,
 254          .shutdown = lxt971_shutdown,
 255         },
 256 #endif
 257 #ifdef CONFIG_FEC_8XX_GENERIC_PHY
 258         {
 259          .id = 0,
 260          .name = "GENERIC",
 261          .startup = generic_startup,
 262          .shutdown = generic_shutdown,
 263          },
 264 #endif
 265 };
 266
 267 /**********************************************************************************/
 268
 269 int fec_mii_phy_id_detect(struct net_device *dev)
 270 {
 271         struct fec_enet_private *fep = netdev_priv(dev);
 272         const struct fec_platform_info *fpi = fep->fpi;
 273         int i, r, start, end, phytype, physubtype;
 274         const struct phy_info *phy;
 275         int phy_hwid, phy_id;
 276
 277         /* if no MDIO */
 278         if (fpi->use_mdio == 0)
 279                 return -1;
 280
 281         phy_hwid = -1;
 282         fep->phy = NULL;
 283
 284         /* auto-detect? */
 285         if (fpi->phy_addr == -1) {
 286                 start = 0;
 287                 end = 32;
 288         } else {                /* direct */
 289                 start = fpi->phy_addr;
 290                 end = start + 1;
 291         }
 292
 293         for (phy_id = start; phy_id < end; phy_id++) {
 294                 r = fec_mii_read(dev, phy_id, MII_PHYSID1);
 295                 if (r == -1 || (phytype = (r & 0xffff)) == 0xffff)
 296                         continue;
 297                 r = fec_mii_read(dev, phy_id, MII_PHYSID2);
 298                 if (r == -1 || (physubtype = (r & 0xffff)) == 0xffff)
 299                         continue;
 300                 phy_hwid = (phytype << 16) | physubtype;
 301                 if (phy_hwid != -1)
 302                         break;
 303         }
 304
 305         if (phy_hwid == -1) {
 306                 printk(KERN_ERR DRV_MODULE_NAME
 307                        ": %s No PHY detected!\n", dev->name);
 308                 return -1;
 309         }
 310
 311         for (i = 0, phy = phy_info; i < ARRAY_SIZE(phy_info); i++, phy++)
 312                 if (phy->id == (phy_hwid >> 4) || phy->id == 0)
 313                         break;
 314
 315         if (i >= ARRAY_SIZE(phy_info)) {
 316                 printk(KERN_ERR DRV_MODULE_NAME
 317                        ": %s PHY id 0x%08x is not supported!\n",
 318                        dev->name, phy_hwid);
 319                 return -1;
 320         }
 321
 322         fep->phy = phy;
 323
 324         printk(KERN_INFO DRV_MODULE_NAME
 325                ": %s Phy @ 0x%x, type %s (0x%08x)\n",
 326                dev->name, phy_id, fep->phy->name, phy_hwid);
 327
 328         return phy_id;
 329 }
 330
 331 void fec_mii_startup(struct net_device *dev)
 332 {
 333         struct fec_enet_private *fep = netdev_priv(dev);
 334         const struct fec_platform_info *fpi = fep->fpi;
 335
 336         if (!fpi->use_mdio || fep->phy == NULL)
 337                 return;
 338
 339         if (fep->phy->startup == NULL)
 340                 return;
 341
 342         (*fep->phy->startup) (dev);
 343 }
 344
 345 void fec_mii_shutdown(struct net_device *dev)
 346 {
 347         struct fec_enet_private *fep = netdev_priv(dev);
 348         const struct fec_platform_info *fpi = fep->fpi;
 349
 350         if (!fpi->use_mdio || fep->phy == NULL)
 351                 return;
 352
 353         if (fep->phy->shutdown == NULL)
 354                 return;
 355
 356         (*fep->phy->shutdown) (dev);
 357 }
 358
 359 void fec_mii_ack_int(struct net_device *dev)
 360 {
 361         struct fec_enet_private *fep = netdev_priv(dev);
 362         const struct fec_platform_info *fpi = fep->fpi;
 363
 364         if (!fpi->use_mdio || fep->phy == NULL)
 365                 return;
 366
 367         if (fep->phy->ack_int == NULL)
 368                 return;
 369
 370         (*fep->phy->ack_int) (dev);
 371 }
 372
 373 /* helper function */
 374 static int mii_negotiated(struct mii_if_info *mii)
 375 {
 376         int advert, lpa, val;
 377
 378         if (!mii_link_ok(mii))
 379                 return 0;
 380
 381         val = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_BMSR);
 382         if ((val & BMSR_ANEGCOMPLETE) == 0)
 383                 return 0;
 384
 385         advert = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_ADVERTISE);
 386         lpa = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_LPA);
 387
 388         return mii_nway_result(advert & lpa);
 389 }
 390
 391 void fec_mii_link_status_change_check(struct net_device *dev, int init_media)
 392 {
 393         struct fec_enet_private *fep = netdev_priv(dev);
 394         unsigned int media;
 395         unsigned long flags;
 396
 397         if (mii_check_media(&fep->mii_if, netif_msg_link(fep), init_media) == 0)
 398                 return;
 399
 400         media = mii_negotiated(&fep->mii_if);
 401
 402         if (netif_carrier_ok(dev)) {
 403                 spin_lock_irqsave(&fep->lock, flags);
 404                 fec_restart(dev, !!(media & ADVERTISE_FULL),
 405                             (media & (ADVERTISE_100FULL | ADVERTISE_100HALF)) ?
 406                             100 : 10);
 407                 spin_unlock_irqrestore(&fep->lock, flags);
 408
 409                 netif_start_queue(dev);
 410         } else {
 411                 netif_stop_queue(dev);
 412
 413                 spin_lock_irqsave(&fep->lock, flags);
 414                 fec_stop(dev);
 415                 spin_unlock_irqrestore(&fep->lock, flags);
 416
 417         }
 418 }