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 /**********************************************************************************/
 207
 208 static const struct phy_info phy_info[] = {
 209 #ifdef CONFIG_FEC_8XX_DM9161_PHY
 210         {
 211          .id = 0x00181b88,
 212          .name = "DM9161",
 213          .startup = dm9161_startup,
 214          .ack_int = dm9161_ack_int,
 215          .shutdown = dm9161_shutdown,
 216          },
 217 #endif
 218 #ifdef CONFIG_FEC_8XX_GENERIC_PHY
 219         {
 220          .id = 0,
 221          .name = "GENERIC",
 222          .startup = generic_startup,
 223          .shutdown = generic_shutdown,
 224          },
 225 #endif
 226 };
 227
 228 /**********************************************************************************/
 229
 230 int fec_mii_phy_id_detect(struct net_device *dev)
 231 {
 232         struct fec_enet_private *fep = netdev_priv(dev);
 233         const struct fec_platform_info *fpi = fep->fpi;
 234         int i, r, start, end, phytype, physubtype;
 235         const struct phy_info *phy;
 236         int phy_hwid, phy_id;
 237
 238         /* if no MDIO */
 239         if (fpi->use_mdio == 0)
 240                 return -1;
 241
 242         phy_hwid = -1;
 243         fep->phy = NULL;
 244
 245         /* auto-detect? */
 246         if (fpi->phy_addr == -1) {
 247                 start = 0;
 248                 end = 32;
 249         } else {                /* direct */
 250                 start = fpi->phy_addr;
 251                 end = start + 1;
 252         }
 253
 254         for (phy_id = start; phy_id < end; phy_id++) {
 255                 r = fec_mii_read(dev, phy_id, MII_PHYSID1);
 256                 if (r == -1 || (phytype = (r & 0xffff)) == 0xffff)
 257                         continue;
 258                 r = fec_mii_read(dev, phy_id, MII_PHYSID2);
 259                 if (r == -1 || (physubtype = (r & 0xffff)) == 0xffff)
 260                         continue;
 261                 phy_hwid = (phytype << 16) | physubtype;
 262                 if (phy_hwid != -1)
 263                         break;
 264         }
 265
 266         if (phy_hwid == -1) {
 267                 printk(KERN_ERR DRV_MODULE_NAME
 268                        ": %s No PHY detected!\n", dev->name);
 269                 return -1;
 270         }
 271
 272         for (i = 0, phy = phy_info; i < sizeof(phy_info) / sizeof(phy_info[0]);
 273              i++, phy++)
 274                 if (phy->id == (phy_hwid >> 4) || phy->id == 0)
 275                         break;
 276
 277         if (i >= sizeof(phy_info) / sizeof(phy_info[0])) {
 278                 printk(KERN_ERR DRV_MODULE_NAME
 279                        ": %s PHY id 0x%08x is not supported!\n",
 280                        dev->name, phy_hwid);
 281                 return -1;
 282         }
 283
 284         fep->phy = phy;
 285
 286         printk(KERN_INFO DRV_MODULE_NAME
 287                ": %s Phy @ 0x%x, type %s (0x%08x)\n",
 288                dev->name, phy_id, fep->phy->name, phy_hwid);
 289
 290         return phy_id;
 291 }
 292
 293 void fec_mii_startup(struct net_device *dev)
 294 {
 295         struct fec_enet_private *fep = netdev_priv(dev);
 296         const struct fec_platform_info *fpi = fep->fpi;
 297
 298         if (!fpi->use_mdio || fep->phy == NULL)
 299                 return;
 300
 301         if (fep->phy->startup == NULL)
 302                 return;
 303
 304         (*fep->phy->startup) (dev);
 305 }
 306
 307 void fec_mii_shutdown(struct net_device *dev)
 308 {
 309         struct fec_enet_private *fep = netdev_priv(dev);
 310         const struct fec_platform_info *fpi = fep->fpi;
 311
 312         if (!fpi->use_mdio || fep->phy == NULL)
 313                 return;
 314
 315         if (fep->phy->shutdown == NULL)
 316                 return;
 317
 318         (*fep->phy->shutdown) (dev);
 319 }
 320
 321 void fec_mii_ack_int(struct net_device *dev)
 322 {
 323         struct fec_enet_private *fep = netdev_priv(dev);
 324         const struct fec_platform_info *fpi = fep->fpi;
 325
 326         if (!fpi->use_mdio || fep->phy == NULL)
 327                 return;
 328
 329         if (fep->phy->ack_int == NULL)
 330                 return;
 331
 332         (*fep->phy->ack_int) (dev);
 333 }
 334
 335 /* helper function */
 336 static int mii_negotiated(struct mii_if_info *mii)
 337 {
 338         int advert, lpa, val;
 339
 340         if (!mii_link_ok(mii))
 341                 return 0;
 342
 343         val = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_BMSR);
 344         if ((val & BMSR_ANEGCOMPLETE) == 0)
 345                 return 0;
 346
 347         advert = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_ADVERTISE);
 348         lpa = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_LPA);
 349
 350         return mii_nway_result(advert & lpa);
 351 }
 352
 353 void fec_mii_link_status_change_check(struct net_device *dev, int init_media)
 354 {
 355         struct fec_enet_private *fep = netdev_priv(dev);
 356         unsigned int media;
 357         unsigned long flags;
 358
 359         if (mii_check_media(&fep->mii_if, netif_msg_link(fep), init_media) == 0)
 360                 return;
 361
 362         media = mii_negotiated(&fep->mii_if);
 363
 364         if (netif_carrier_ok(dev)) {
 365                 spin_lock_irqsave(&fep->lock, flags);
 366                 fec_restart(dev, !!(media & ADVERTISE_FULL),
 367                             (media & (ADVERTISE_100FULL | ADVERTISE_100HALF)) ?
 368                             100 : 10);
 369                 spin_unlock_irqrestore(&fep->lock, flags);
 370
 371                 netif_start_queue(dev);
 372         } else {
 373                 netif_stop_queue(dev);
 374
 375                 spin_lock_irqsave(&fep->lock, flags);
 376                 fec_stop(dev);
 377                 spin_unlock_irqrestore(&fep->lock, flags);
 378
 379         }
 380 }