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/config.h>
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/kernel.h>
  17 #include <linux/sched.h>
  18 #include <linux/string.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/errno.h>
  21 #include <linux/ioport.h>
  22 #include <linux/slab.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/pci.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/netdevice.h>
  28 #include <linux/etherdevice.h>
  29 #include <linux/skbuff.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/mii.h>
  32 #include <linux/ethtool.h>
  33 #include <linux/bitops.h>
  34
  35 #include <asm/8xx_immap.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/mpc8xx.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/commproc.h>
  41
  42 /*************************************************/
  43
  44 #include "fec_8xx.h"
  45
  46 /*************************************************/
  47
  48 /* Make MII read/write commands for the FEC.
  49 */
  50 #define mk_mii_read(REG)        (0x60020000 | ((REG & 0x1f) << 18))
  51 #define mk_mii_write(REG, VAL)  (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
  52 #define mk_mii_end              0
  53
  54 /*************************************************/
  55
  56 /* XXX both FECs use the MII interface of FEC1 */
  57 static DEFINE_SPINLOCK(fec_mii_lock);
  58
  59 #define FEC_MII_LOOPS   10000
  60
  61 int fec_mii_read(struct net_device *dev, int phy_id, int location)
  62 {
  63         struct fec_enet_private *fep = netdev_priv(dev);
  64         fec_t *fecp;
  65         int i, ret = -1;
  66         unsigned long flags;
  67
  68         /* XXX MII interface is only connected to FEC1 */
  69         fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
  70
  71         spin_lock_irqsave(&fec_mii_lock, flags);
  72
  73         if ((FR(fecp, r_cntrl) & FEC_RCNTRL_MII_MODE) == 0) {
  74                 FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
  75                 FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
  76                 FW(fecp, ievent, FEC_ENET_MII);
  77         }
  78
  79         /* Add PHY address to register command.  */
  80         FW(fecp, mii_speed, fep->fec_phy_speed);
  81         FW(fecp, mii_data, (phy_id << 23) | mk_mii_read(location));
  82
  83         for (i = 0; i < FEC_MII_LOOPS; i++)
  84                 if ((FR(fecp, ievent) & FEC_ENET_MII) != 0)
  85                         break;
  86
  87         if (i < FEC_MII_LOOPS) {
  88                 FW(fecp, ievent, FEC_ENET_MII);
  89                 ret = FR(fecp, mii_data) & 0xffff;
  90         }
  91
  92         spin_unlock_irqrestore(&fec_mii_lock, flags);
  93
  94         return ret;
  95 }
  96
  97 void fec_mii_write(struct net_device *dev, int phy_id, int location, int value)
  98 {
  99         struct fec_enet_private *fep = netdev_priv(dev);
 100         fec_t *fecp;
 101         unsigned long flags;
 102         int i;
 103
 104         /* XXX MII interface is only connected to FEC1 */
 105         fecp = &((immap_t *) IMAP_ADDR)->im_cpm.cp_fec;
 106
 107         spin_lock_irqsave(&fec_mii_lock, flags);
 108
 109         if ((FR(fecp, r_cntrl) & FEC_RCNTRL_MII_MODE) == 0) {
 110                 FS(fecp, r_cntrl, FEC_RCNTRL_MII_MODE); /* MII enable */
 111                 FS(fecp, ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
 112                 FW(fecp, ievent, FEC_ENET_MII);
 113         }
 114
 115         /* Add PHY address to register command.  */
 116         FW(fecp, mii_speed, fep->fec_phy_speed);        /* always adapt mii speed */
 117         FW(fecp, mii_data, (phy_id << 23) | mk_mii_write(location, value));
 118
 119         for (i = 0; i < FEC_MII_LOOPS; i++)
 120                 if ((FR(fecp, ievent) & FEC_ENET_MII) != 0)
 121                         break;
 122
 123         if (i < FEC_MII_LOOPS)
 124                 FW(fecp, ievent, FEC_ENET_MII);
 125
 126         spin_unlock_irqrestore(&fec_mii_lock, flags);
 127 }
 128
 129 /*************************************************/
 130
 131 #ifdef CONFIG_FEC_8XX_GENERIC_PHY
 132
 133 /*
 134  * Generic PHY support.
 135  * Should work for all PHYs, but link change is detected by polling
 136  */
 137
 138 static void generic_timer_callback(unsigned long data)
 139 {
 140         struct net_device *dev = (struct net_device *)data;
 141         struct fec_enet_private *fep = netdev_priv(dev);
 142
 143         fep->phy_timer_list.expires = jiffies + HZ / 2;
 144
 145         add_timer(&fep->phy_timer_list);
 146
 147         fec_mii_link_status_change_check(dev, 0);
 148 }
 149
 150 static void generic_startup(struct net_device *dev)
 151 {
 152         struct fec_enet_private *fep = netdev_priv(dev);
 153
 154         fep->phy_timer_list.expires = jiffies + HZ / 2; /* every 500ms */
 155         fep->phy_timer_list.data = (unsigned long)dev;
 156         fep->phy_timer_list.function = generic_timer_callback;
 157         add_timer(&fep->phy_timer_list);
 158 }
 159
 160 static void generic_shutdown(struct net_device *dev)
 161 {
 162         struct fec_enet_private *fep = netdev_priv(dev);
 163
 164         del_timer_sync(&fep->phy_timer_list);
 165 }
 166
 167 #endif
 168
 169 #ifdef CONFIG_FEC_8XX_DM9161_PHY
 170
 171 /* ------------------------------------------------------------------------- */
 172 /* The Davicom DM9161 is used on the NETTA board                             */
 173
 174 /* register definitions */
 175
 176 #define MII_DM9161_ACR          16      /* Aux. Config Register         */
 177 #define MII_DM9161_ACSR         17      /* Aux. Config/Status Register  */
 178 #define MII_DM9161_10TCSR       18      /* 10BaseT Config/Status Reg.   */
 179 #define MII_DM9161_INTR         21      /* Interrupt Register           */
 180 #define MII_DM9161_RECR         22      /* Receive Error Counter Reg.   */
 181 #define MII_DM9161_DISCR        23      /* Disconnect Counter Register  */
 182
 183 static void dm9161_startup(struct net_device *dev)
 184 {
 185         struct fec_enet_private *fep = netdev_priv(dev);
 186
 187         fec_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0000);
 188 }
 189
 190 static void dm9161_ack_int(struct net_device *dev)
 191 {
 192         struct fec_enet_private *fep = netdev_priv(dev);
 193
 194         fec_mii_read(dev, fep->mii_if.phy_id, MII_DM9161_INTR);
 195 }
 196
 197 static void dm9161_shutdown(struct net_device *dev)
 198 {
 199         struct fec_enet_private *fep = netdev_priv(dev);
 200
 201         fec_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0f00);
 202 }
 203
 204 #endif
 205
 206 #ifdef CONFIG_FEC_8XX_LXT971_PHY
 207
 208 /* Support for LXT971/972 PHY */
 209
 210 #define MII_LXT971_PCR          16 /* Port Control Register */
 211 #define MII_LXT971_SR2          17 /* Status Register 2 */
 212 #define MII_LXT971_IER          18 /* Interrupt Enable Register */
 213 #define MII_LXT971_ISR          19 /* Interrupt Status Register */
 214 #define MII_LXT971_LCR          20 /* LED Control Register */
 215 #define MII_LXT971_TCR          30 /* Transmit Control Register */
 216
 217 static void lxt971_startup(struct net_device *dev)
 218 {
 219         struct fec_enet_private *fep = netdev_priv(dev);
 220
 221         fec_mii_write(dev, fep->mii_if.phy_id, MII_LXT971_IER, 0x00F2);
 222 }
 223
 224 static void lxt971_ack_int(struct net_device *dev)
 225 {
 226         struct fec_enet_private *fep = netdev_priv(dev);
 227
 228         fec_mii_read(dev, fep->mii_if.phy_id, MII_LXT971_ISR);
 229 }
 230
 231 static void lxt971_shutdown(struct net_device *dev)
 232 {
 233         struct fec_enet_private *fep = netdev_priv(dev);
 234
 235         fec_mii_write(dev, fep->mii_if.phy_id, MII_LXT971_IER, 0x0000);
 236 }
 237 #endif
 238
 239 /**********************************************************************************/
 240
 241 static const struct phy_info phy_info[] = {
 242 #ifdef CONFIG_FEC_8XX_DM9161_PHY
 243         {
 244          .id = 0x00181b88,
 245          .name = "DM9161",
 246          .startup = dm9161_startup,
 247          .ack_int = dm9161_ack_int,
 248          .shutdown = dm9161_shutdown,
 249          },
 250 #endif
 251 #ifdef CONFIG_FEC_8XX_LXT971_PHY
 252         {
 253          .id = 0x0001378e,
 254          .name = "LXT971/972",
 255          .startup = lxt971_startup,
 256          .ack_int = lxt971_ack_int,
 257          .shutdown = lxt971_shutdown,
 258         },
 259 #endif
 260 #ifdef CONFIG_FEC_8XX_GENERIC_PHY
 261         {
 262          .id = 0,
 263          .name = "GENERIC",
 264          .startup = generic_startup,
 265          .shutdown = generic_shutdown,
 266          },
 267 #endif
 268 };
 269
 270 /**********************************************************************************/
 271
 272 int fec_mii_phy_id_detect(struct net_device *dev)
 273 {
 274         struct fec_enet_private *fep = netdev_priv(dev);
 275         const struct fec_platform_info *fpi = fep->fpi;
 276         int i, r, start, end, phytype, physubtype;
 277         const struct phy_info *phy;
 278         int phy_hwid, phy_id;
 279
 280         /* if no MDIO */
 281         if (fpi->use_mdio == 0)
 282                 return -1;
 283
 284         phy_hwid = -1;
 285         fep->phy = NULL;
 286
 287         /* auto-detect? */
 288         if (fpi->phy_addr == -1) {
 289                 start = 0;
 290                 end = 32;
 291         } else {                /* direct */
 292                 start = fpi->phy_addr;
 293                 end = start + 1;
 294         }
 295
 296         for (phy_id = start; phy_id < end; phy_id++) {
 297                 r = fec_mii_read(dev, phy_id, MII_PHYSID1);
 298                 if (r == -1 || (phytype = (r & 0xffff)) == 0xffff)
 299                         continue;
 300                 r = fec_mii_read(dev, phy_id, MII_PHYSID2);
 301                 if (r == -1 || (physubtype = (r & 0xffff)) == 0xffff)
 302                         continue;
 303                 phy_hwid = (phytype << 16) | physubtype;
 304                 if (phy_hwid != -1)
 305                         break;
 306         }
 307
 308         if (phy_hwid == -1) {
 309                 printk(KERN_ERR DRV_MODULE_NAME
 310                        ": %s No PHY detected!\n", dev->name);
 311                 return -1;
 312         }
 313
 314         for (i = 0, phy = phy_info; i < sizeof(phy_info) / sizeof(phy_info[0]);
 315              i++, phy++)
 316                 if (phy->id == (phy_hwid >> 4) || phy->id == 0)
 317                         break;
 318
 319         if (i >= sizeof(phy_info) / sizeof(phy_info[0])) {
 320                 printk(KERN_ERR DRV_MODULE_NAME
 321                        ": %s PHY id 0x%08x is not supported!\n",
 322                        dev->name, phy_hwid);
 323                 return -1;
 324         }
 325
 326         fep->phy = phy;
 327
 328         printk(KERN_INFO DRV_MODULE_NAME
 329                ": %s Phy @ 0x%x, type %s (0x%08x)\n",
 330                dev->name, phy_id, fep->phy->name, phy_hwid);
 331
 332         return phy_id;
 333 }
 334
 335 void fec_mii_startup(struct net_device *dev)
 336 {
 337         struct fec_enet_private *fep = netdev_priv(dev);
 338         const struct fec_platform_info *fpi = fep->fpi;
 339
 340         if (!fpi->use_mdio || fep->phy == NULL)
 341                 return;
 342
 343         if (fep->phy->startup == NULL)
 344                 return;
 345
 346         (*fep->phy->startup) (dev);
 347 }
 348
 349 void fec_mii_shutdown(struct net_device *dev)
 350 {
 351         struct fec_enet_private *fep = netdev_priv(dev);
 352         const struct fec_platform_info *fpi = fep->fpi;
 353
 354         if (!fpi->use_mdio || fep->phy == NULL)
 355                 return;
 356
 357         if (fep->phy->shutdown == NULL)
 358                 return;
 359
 360         (*fep->phy->shutdown) (dev);
 361 }
 362
 363 void fec_mii_ack_int(struct net_device *dev)
 364 {
 365         struct fec_enet_private *fep = netdev_priv(dev);
 366         const struct fec_platform_info *fpi = fep->fpi;
 367
 368         if (!fpi->use_mdio || fep->phy == NULL)
 369                 return;
 370
 371         if (fep->phy->ack_int == NULL)
 372                 return;
 373
 374         (*fep->phy->ack_int) (dev);
 375 }
 376
 377 /* helper function */
 378 static int mii_negotiated(struct mii_if_info *mii)
 379 {
 380         int advert, lpa, val;
 381
 382         if (!mii_link_ok(mii))
 383                 return 0;
 384
 385         val = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_BMSR);
 386         if ((val & BMSR_ANEGCOMPLETE) == 0)
 387                 return 0;
 388
 389         advert = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_ADVERTISE);
 390         lpa = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_LPA);
 391
 392         return mii_nway_result(advert & lpa);
 393 }
 394
 395 void fec_mii_link_status_change_check(struct net_device *dev, int init_media)
 396 {
 397         struct fec_enet_private *fep = netdev_priv(dev);
 398         unsigned int media;
 399         unsigned long flags;
 400
 401         if (mii_check_media(&fep->mii_if, netif_msg_link(fep), init_media) == 0)
 402                 return;
 403
 404         media = mii_negotiated(&fep->mii_if);
 405
 406         if (netif_carrier_ok(dev)) {
 407                 spin_lock_irqsave(&fep->lock, flags);
 408                 fec_restart(dev, !!(media & ADVERTISE_FULL),
 409                             (media & (ADVERTISE_100FULL | ADVERTISE_100HALF)) ?
 410                             100 : 10);
 411                 spin_unlock_irqrestore(&fep->lock, flags);
 412
 413                 netif_start_queue(dev);
 414         } else {
 415                 netif_stop_queue(dev);
 416
 417                 spin_lock_irqsave(&fep->lock, flags);
 418                 fec_stop(dev);
 419                 spin_unlock_irqrestore(&fep->lock, flags);
 420
 421         }
 422 }