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   1 /*
   2  * drivers/net/ibm_newemac/core.c
   3  *
   4  * Driver for PowerPC 4xx on-chip ethernet controller.
   5  *
   6  * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
   7  *                <benh@kernel.crashing.org>
   8  *
   9  * Based on the arch/ppc version of the driver:
  10  *
  11  * Copyright (c) 2004, 2005 Zultys Technologies.
  12  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  13  *
  14  * Based on original work by
  15  *      Matt Porter <mporter@kernel.crashing.org>
  16  *      (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
  17  *      Armin Kuster <akuster@mvista.com>
  18  *      Johnnie Peters <jpeters@mvista.com>
  19  *
  20  * This program is free software; you can redistribute  it and/or modify it
  21  * under  the terms of  the GNU General  Public License as published by the
  22  * Free Software Foundation;  either version 2 of the  License, or (at your
  23  * option) any later version.
  24  *
  25  */
  26
  27 #include <linux/sched.h>
  28 #include <linux/string.h>
  29 #include <linux/errno.h>
  30 #include <linux/delay.h>
  31 #include <linux/types.h>
  32 #include <linux/pci.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/skbuff.h>
  35 #include <linux/crc32.h>
  36 #include <linux/ethtool.h>
  37 #include <linux/mii.h>
  38 #include <linux/bitops.h>
  39 #include <linux/workqueue.h>
  40 #include <linux/of.h>
  41
  42 #include <asm/processor.h>
  43 #include <asm/io.h>
  44 #include <asm/dma.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/dcr.h>
  47 #include <asm/dcr-regs.h>
  48
  49 #include "core.h"
  50
  51 /*
  52  * Lack of dma_unmap_???? calls is intentional.
  53  *
  54  * API-correct usage requires additional support state information to be
  55  * maintained for every RX and TX buffer descriptor (BD). Unfortunately, due to
  56  * EMAC design (e.g. TX buffer passed from network stack can be split into
  57  * several BDs, dma_map_single/dma_map_page can be used to map particular BD),
  58  * maintaining such information will add additional overhead.
  59  * Current DMA API implementation for 4xx processors only ensures cache coherency
  60  * and dma_unmap_???? routines are empty and are likely to stay this way.
  61  * I decided to omit dma_unmap_??? calls because I don't want to add additional
  62  * complexity just for the sake of following some abstract API, when it doesn't
  63  * add any real benefit to the driver. I understand that this decision maybe
  64  * controversial, but I really tried to make code API-correct and efficient
  65  * at the same time and didn't come up with code I liked :(.                --ebs
  66  */
  67
  68 #define DRV_NAME        "emac"
  69 #define DRV_VERSION     "3.54"
  70 #define DRV_DESC        "PPC 4xx OCP EMAC driver"
  71
  72 MODULE_DESCRIPTION(DRV_DESC);
  73 MODULE_AUTHOR
  74     ("Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>");
  75 MODULE_LICENSE("GPL");
  76
  77 /*
  78  * PPC64 doesn't (yet) have a cacheable_memcpy
  79  */
  80 #ifdef CONFIG_PPC64
  81 #define cacheable_memcpy(d,s,n) memcpy((d),(s),(n))
  82 #endif
  83
  84 /* minimum number of free TX descriptors required to wake up TX process */
  85 #define EMAC_TX_WAKEUP_THRESH           (NUM_TX_BUFF / 4)
  86
  87 /* If packet size is less than this number, we allocate small skb and copy packet
  88  * contents into it instead of just sending original big skb up
  89  */
  90 #define EMAC_RX_COPY_THRESH             CONFIG_IBM_NEW_EMAC_RX_COPY_THRESHOLD
  91
  92 /* Since multiple EMACs share MDIO lines in various ways, we need
  93  * to avoid re-using the same PHY ID in cases where the arch didn't
  94  * setup precise phy_map entries
  95  *
  96  * XXX This is something that needs to be reworked as we can have multiple
  97  * EMAC "sets" (multiple ASICs containing several EMACs) though we can
  98  * probably require in that case to have explicit PHY IDs in the device-tree
  99  */
 100 static u32 busy_phy_map;
 101 static DEFINE_MUTEX(emac_phy_map_lock);
 102
 103 /* This is the wait queue used to wait on any event related to probe, that
 104  * is discovery of MALs, other EMACs, ZMII/RGMIIs, etc...
 105  */
 106 static DECLARE_WAIT_QUEUE_HEAD(emac_probe_wait);
 107
 108 /* Having stable interface names is a doomed idea. However, it would be nice
 109  * if we didn't have completely random interface names at boot too :-) It's
 110  * just a matter of making everybody's life easier. Since we are doing
 111  * threaded probing, it's a bit harder though. The base idea here is that
 112  * we make up a list of all emacs in the device-tree before we register the
 113  * driver. Every emac will then wait for the previous one in the list to
 114  * initialize before itself. We should also keep that list ordered by
 115  * cell_index.
 116  * That list is only 4 entries long, meaning that additional EMACs don't
 117  * get ordering guarantees unless EMAC_BOOT_LIST_SIZE is increased.
 118  */
 119
 120 #define EMAC_BOOT_LIST_SIZE     4
 121 static struct device_node *emac_boot_list[EMAC_BOOT_LIST_SIZE];
 122
 123 /* How long should I wait for dependent devices ? */
 124 #define EMAC_PROBE_DEP_TIMEOUT  (HZ * 5)
 125
 126 /* I don't want to litter system log with timeout errors
 127  * when we have brain-damaged PHY.
 128  */
 129 static inline void emac_report_timeout_error(struct emac_instance *dev,
 130                                              const char *error)
 131 {
 132         if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX |
 133                                   EMAC_FTR_460EX_PHY_CLK_FIX |
 134                                   EMAC_FTR_440EP_PHY_CLK_FIX))
 135                 DBG(dev, "%s" NL, error);
 136         else if (net_ratelimit())
 137                 printk(KERN_ERR "%s: %s\n", dev->ndev->name, error);
 138 }
 139
 140 /* EMAC PHY clock workaround:
 141  * 440EP/440GR has more sane SDR0_MFR register implementation than 440GX,
 142  * which allows controlling each EMAC clock
 143  */
 144 static inline void emac_rx_clk_tx(struct emac_instance *dev)
 145 {
 146 #ifdef CONFIG_PPC_DCR_NATIVE
 147         if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
 148                 dcri_clrset(SDR0, SDR0_MFR,
 149                             0, SDR0_MFR_ECS >> dev->cell_index);
 150 #endif
 151 }
 152
 153 static inline void emac_rx_clk_default(struct emac_instance *dev)
 154 {
 155 #ifdef CONFIG_PPC_DCR_NATIVE
 156         if (emac_has_feature(dev, EMAC_FTR_440EP_PHY_CLK_FIX))
 157                 dcri_clrset(SDR0, SDR0_MFR,
 158                             SDR0_MFR_ECS >> dev->cell_index, 0);
 159 #endif
 160 }
 161
 162 /* PHY polling intervals */
 163 #define PHY_POLL_LINK_ON        HZ
 164 #define PHY_POLL_LINK_OFF       (HZ / 5)
 165
 166 /* Graceful stop timeouts in us.
 167  * We should allow up to 1 frame time (full-duplex, ignoring collisions)
 168  */
 169 #define STOP_TIMEOUT_10         1230
 170 #define STOP_TIMEOUT_100        124
 171 #define STOP_TIMEOUT_1000       13
 172 #define STOP_TIMEOUT_1000_JUMBO 73
 173
 174 static unsigned char default_mcast_addr[] = {
 175         0x01, 0x80, 0xC2, 0x00, 0x00, 0x01
 176 };
 177
 178 /* Please, keep in sync with struct ibm_emac_stats/ibm_emac_error_stats */
 179 static const char emac_stats_keys[EMAC_ETHTOOL_STATS_COUNT][ETH_GSTRING_LEN] = {
 180         "rx_packets", "rx_bytes", "tx_packets", "tx_bytes", "rx_packets_csum",
 181         "tx_packets_csum", "tx_undo", "rx_dropped_stack", "rx_dropped_oom",
 182         "rx_dropped_error", "rx_dropped_resize", "rx_dropped_mtu",
 183         "rx_stopped", "rx_bd_errors", "rx_bd_overrun", "rx_bd_bad_packet",
 184         "rx_bd_runt_packet", "rx_bd_short_event", "rx_bd_alignment_error",
 185         "rx_bd_bad_fcs", "rx_bd_packet_too_long", "rx_bd_out_of_range",
 186         "rx_bd_in_range", "rx_parity", "rx_fifo_overrun", "rx_overrun",
 187         "rx_bad_packet", "rx_runt_packet", "rx_short_event",
 188         "rx_alignment_error", "rx_bad_fcs", "rx_packet_too_long",
 189         "rx_out_of_range", "rx_in_range", "tx_dropped", "tx_bd_errors",
 190         "tx_bd_bad_fcs", "tx_bd_carrier_loss", "tx_bd_excessive_deferral",
 191         "tx_bd_excessive_collisions", "tx_bd_late_collision",
 192         "tx_bd_multple_collisions", "tx_bd_single_collision",
 193         "tx_bd_underrun", "tx_bd_sqe", "tx_parity", "tx_underrun", "tx_sqe",
 194         "tx_errors"
 195 };
 196
 197 static irqreturn_t emac_irq(int irq, void *dev_instance);
 198 static void emac_clean_tx_ring(struct emac_instance *dev);
 199 static void __emac_set_multicast_list(struct emac_instance *dev);
 200
 201 static inline int emac_phy_supports_gige(int phy_mode)
 202 {
 203         return  phy_mode == PHY_MODE_GMII ||
 204                 phy_mode == PHY_MODE_RGMII ||
 205                 phy_mode == PHY_MODE_SGMII ||
 206                 phy_mode == PHY_MODE_TBI ||
 207                 phy_mode == PHY_MODE_RTBI;
 208 }
 209
 210 static inline int emac_phy_gpcs(int phy_mode)
 211 {
 212         return  phy_mode == PHY_MODE_SGMII ||
 213                 phy_mode == PHY_MODE_TBI ||
 214                 phy_mode == PHY_MODE_RTBI;
 215 }
 216
 217 static inline void emac_tx_enable(struct emac_instance *dev)
 218 {
 219         struct emac_regs __iomem *p = dev->emacp;
 220         u32 r;
 221
 222         DBG(dev, "tx_enable" NL);
 223
 224         r = in_be32(&p->mr0);
 225         if (!(r & EMAC_MR0_TXE))
 226                 out_be32(&p->mr0, r | EMAC_MR0_TXE);
 227 }
 228
 229 static void emac_tx_disable(struct emac_instance *dev)
 230 {
 231         struct emac_regs __iomem *p = dev->emacp;
 232         u32 r;
 233
 234         DBG(dev, "tx_disable" NL);
 235
 236         r = in_be32(&p->mr0);
 237         if (r & EMAC_MR0_TXE) {
 238                 int n = dev->stop_timeout;
 239                 out_be32(&p->mr0, r & ~EMAC_MR0_TXE);
 240                 while (!(in_be32(&p->mr0) & EMAC_MR0_TXI) && n) {
 241                         udelay(1);
 242                         --n;
 243                 }
 244                 if (unlikely(!n))
 245                         emac_report_timeout_error(dev, "TX disable timeout");
 246         }
 247 }
 248
 249 static void emac_rx_enable(struct emac_instance *dev)
 250 {
 251         struct emac_regs __iomem *p = dev->emacp;
 252         u32 r;
 253
 254         if (unlikely(test_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags)))
 255                 goto out;
 256
 257         DBG(dev, "rx_enable" NL);
 258
 259         r = in_be32(&p->mr0);
 260         if (!(r & EMAC_MR0_RXE)) {
 261                 if (unlikely(!(r & EMAC_MR0_RXI))) {
 262                         /* Wait if previous async disable is still in progress */
 263                         int n = dev->stop_timeout;
 264                         while (!(r = in_be32(&p->mr0) & EMAC_MR0_RXI) && n) {
 265                                 udelay(1);
 266                                 --n;
 267                         }
 268                         if (unlikely(!n))
 269                                 emac_report_timeout_error(dev,
 270                                                           "RX disable timeout");
 271                 }
 272                 out_be32(&p->mr0, r | EMAC_MR0_RXE);
 273         }
 274  out:
 275         ;
 276 }
 277
 278 static void emac_rx_disable(struct emac_instance *dev)
 279 {
 280         struct emac_regs __iomem *p = dev->emacp;
 281         u32 r;
 282
 283         DBG(dev, "rx_disable" NL);
 284
 285         r = in_be32(&p->mr0);
 286         if (r & EMAC_MR0_RXE) {
 287                 int n = dev->stop_timeout;
 288                 out_be32(&p->mr0, r & ~EMAC_MR0_RXE);
 289                 while (!(in_be32(&p->mr0) & EMAC_MR0_RXI) && n) {
 290                         udelay(1);
 291                         --n;
 292                 }
 293                 if (unlikely(!n))
 294                         emac_report_timeout_error(dev, "RX disable timeout");
 295         }
 296 }
 297
 298 static inline void emac_netif_stop(struct emac_instance *dev)
 299 {
 300         netif_tx_lock_bh(dev->ndev);
 301         netif_addr_lock(dev->ndev);
 302         dev->no_mcast = 1;
 303         netif_addr_unlock(dev->ndev);
 304         netif_tx_unlock_bh(dev->ndev);
 305         dev->ndev->trans_start = jiffies;       /* prevent tx timeout */
 306         mal_poll_disable(dev->mal, &dev->commac);
 307         netif_tx_disable(dev->ndev);
 308 }
 309
 310 static inline void emac_netif_start(struct emac_instance *dev)
 311 {
 312         netif_tx_lock_bh(dev->ndev);
 313         netif_addr_lock(dev->ndev);
 314         dev->no_mcast = 0;
 315         if (dev->mcast_pending && netif_running(dev->ndev))
 316                 __emac_set_multicast_list(dev);
 317         netif_addr_unlock(dev->ndev);
 318         netif_tx_unlock_bh(dev->ndev);
 319
 320         netif_wake_queue(dev->ndev);
 321
 322         /* NOTE: unconditional netif_wake_queue is only appropriate
 323          * so long as all callers are assured to have free tx slots
 324          * (taken from tg3... though the case where that is wrong is
 325          *  not terribly harmful)
 326          */
 327         mal_poll_enable(dev->mal, &dev->commac);
 328 }
 329
 330 static inline void emac_rx_disable_async(struct emac_instance *dev)
 331 {
 332         struct emac_regs __iomem *p = dev->emacp;
 333         u32 r;
 334
 335         DBG(dev, "rx_disable_async" NL);
 336
 337         r = in_be32(&p->mr0);
 338         if (r & EMAC_MR0_RXE)
 339                 out_be32(&p->mr0, r & ~EMAC_MR0_RXE);
 340 }
 341
 342 static int emac_reset(struct emac_instance *dev)
 343 {
 344         struct emac_regs __iomem *p = dev->emacp;
 345         int n = 20;
 346
 347         DBG(dev, "reset" NL);
 348
 349         if (!dev->reset_failed) {
 350                 /* 40x erratum suggests stopping RX channel before reset,
 351                  * we stop TX as well
 352                  */
 353                 emac_rx_disable(dev);
 354                 emac_tx_disable(dev);
 355         }
 356
 357 #ifdef CONFIG_PPC_DCR_NATIVE
 358         /* Enable internal clock source */
 359         if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX))
 360                 dcri_clrset(SDR0, SDR0_ETH_CFG,
 361                             0, SDR0_ETH_CFG_ECS << dev->cell_index);
 362 #endif
 363
 364         out_be32(&p->mr0, EMAC_MR0_SRST);
 365         while ((in_be32(&p->mr0) & EMAC_MR0_SRST) && n)
 366                 --n;
 367
 368 #ifdef CONFIG_PPC_DCR_NATIVE
 369          /* Enable external clock source */
 370         if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX))
 371                 dcri_clrset(SDR0, SDR0_ETH_CFG,
 372                             SDR0_ETH_CFG_ECS << dev->cell_index, 0);
 373 #endif
 374
 375         if (n) {
 376                 dev->reset_failed = 0;
 377                 return 0;
 378         } else {
 379                 emac_report_timeout_error(dev, "reset timeout");
 380                 dev->reset_failed = 1;
 381                 return -ETIMEDOUT;
 382         }
 383 }
 384
 385 static void emac_hash_mc(struct emac_instance *dev)
 386 {
 387         const int regs = EMAC_XAHT_REGS(dev);
 388         u32 *gaht_base = emac_gaht_base(dev);
 389         u32 gaht_temp[regs];
 390         struct dev_mc_list *dmi;
 391         int i;
 392
 393         DBG(dev, "hash_mc %d" NL, dev->ndev->mc_count);
 394
 395         memset(gaht_temp, 0, sizeof (gaht_temp));
 396
 397         for (dmi = dev->ndev->mc_list; dmi; dmi = dmi->next) {
 398                 int slot, reg, mask;
 399                 DBG2(dev, "mc %02x:%02x:%02x:%02x:%02x:%02x" NL,
 400                      dmi->dmi_addr[0], dmi->dmi_addr[1], dmi->dmi_addr[2],
 401                      dmi->dmi_addr[3], dmi->dmi_addr[4], dmi->dmi_addr[5]);
 402
 403                 slot = EMAC_XAHT_CRC_TO_SLOT(dev, ether_crc(ETH_ALEN, dmi->dmi_addr));
 404                 reg = EMAC_XAHT_SLOT_TO_REG(dev, slot);
 405                 mask = EMAC_XAHT_SLOT_TO_MASK(dev, slot);
 406
 407                 gaht_temp[reg] |= mask;
 408         }
 409
 410         for (i = 0; i < regs; i++)
 411                 out_be32(gaht_base + i, gaht_temp[i]);
 412 }
 413
 414 static inline u32 emac_iff2rmr(struct net_device *ndev)
 415 {
 416         struct emac_instance *dev = netdev_priv(ndev);
 417         u32 r;
 418
 419         r = EMAC_RMR_SP | EMAC_RMR_SFCS | EMAC_RMR_IAE | EMAC_RMR_BAE;
 420
 421         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
 422             r |= EMAC4_RMR_BASE;
 423         else
 424             r |= EMAC_RMR_BASE;
 425
 426         if (ndev->flags & IFF_PROMISC)
 427                 r |= EMAC_RMR_PME;
 428         else if (ndev->flags & IFF_ALLMULTI ||
 429                          (ndev->mc_count > EMAC_XAHT_SLOTS(dev)))
 430                 r |= EMAC_RMR_PMME;
 431         else if (ndev->mc_count > 0)
 432                 r |= EMAC_RMR_MAE;
 433
 434         return r;
 435 }
 436
 437 static u32 __emac_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_size)
 438 {
 439         u32 ret = EMAC_MR1_VLE | EMAC_MR1_IST | EMAC_MR1_TR0_MULT;
 440
 441         DBG2(dev, "__emac_calc_base_mr1" NL);
 442
 443         switch(tx_size) {
 444         case 2048:
 445                 ret |= EMAC_MR1_TFS_2K;
 446                 break;
 447         default:
 448                 printk(KERN_WARNING "%s: Unknown Rx FIFO size %d\n",
 449                        dev->ndev->name, tx_size);
 450         }
 451
 452         switch(rx_size) {
 453         case 16384:
 454                 ret |= EMAC_MR1_RFS_16K;
 455                 break;
 456         case 4096:
 457                 ret |= EMAC_MR1_RFS_4K;
 458                 break;
 459         default:
 460                 printk(KERN_WARNING "%s: Unknown Rx FIFO size %d\n",
 461                        dev->ndev->name, rx_size);
 462         }
 463
 464         return ret;
 465 }
 466
 467 static u32 __emac4_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_size)
 468 {
 469         u32 ret = EMAC_MR1_VLE | EMAC_MR1_IST | EMAC4_MR1_TR |
 470                 EMAC4_MR1_OBCI(dev->opb_bus_freq / 1000000);
 471
 472         DBG2(dev, "__emac4_calc_base_mr1" NL);
 473
 474         switch(tx_size) {
 475         case 4096:
 476                 ret |= EMAC4_MR1_TFS_4K;
 477                 break;
 478         case 2048:
 479                 ret |= EMAC4_MR1_TFS_2K;
 480                 break;
 481         default:
 482                 printk(KERN_WARNING "%s: Unknown Rx FIFO size %d\n",
 483                        dev->ndev->name, tx_size);
 484         }
 485
 486         switch(rx_size) {
 487         case 16384:
 488                 ret |= EMAC4_MR1_RFS_16K;
 489                 break;
 490         case 4096:
 491                 ret |= EMAC4_MR1_RFS_4K;
 492                 break;
 493         case 2048:
 494                 ret |= EMAC4_MR1_RFS_2K;
 495                 break;
 496         default:
 497                 printk(KERN_WARNING "%s: Unknown Rx FIFO size %d\n",
 498                        dev->ndev->name, rx_size);
 499         }
 500
 501         return ret;
 502 }
 503
 504 static u32 emac_calc_base_mr1(struct emac_instance *dev, int tx_size, int rx_size)
 505 {
 506         return emac_has_feature(dev, EMAC_FTR_EMAC4) ?
 507                 __emac4_calc_base_mr1(dev, tx_size, rx_size) :
 508                 __emac_calc_base_mr1(dev, tx_size, rx_size);
 509 }
 510
 511 static inline u32 emac_calc_trtr(struct emac_instance *dev, unsigned int size)
 512 {
 513         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
 514                 return ((size >> 6) - 1) << EMAC_TRTR_SHIFT_EMAC4;
 515         else
 516                 return ((size >> 6) - 1) << EMAC_TRTR_SHIFT;
 517 }
 518
 519 static inline u32 emac_calc_rwmr(struct emac_instance *dev,
 520                                  unsigned int low, unsigned int high)
 521 {
 522         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
 523                 return (low << 22) | ( (high & 0x3ff) << 6);
 524         else
 525                 return (low << 23) | ( (high & 0x1ff) << 7);
 526 }
 527
 528 static int emac_configure(struct emac_instance *dev)
 529 {
 530         struct emac_regs __iomem *p = dev->emacp;
 531         struct net_device *ndev = dev->ndev;
 532         int tx_size, rx_size, link = netif_carrier_ok(dev->ndev);
 533         u32 r, mr1 = 0;
 534
 535         DBG(dev, "configure" NL);
 536
 537         if (!link) {
 538                 out_be32(&p->mr1, in_be32(&p->mr1)
 539                          | EMAC_MR1_FDE | EMAC_MR1_ILE);
 540                 udelay(100);
 541         } else if (emac_reset(dev) < 0)
 542                 return -ETIMEDOUT;
 543
 544         if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
 545                 tah_reset(dev->tah_dev);
 546
 547         DBG(dev, " link = %d duplex = %d, pause = %d, asym_pause = %d\n",
 548             link, dev->phy.duplex, dev->phy.pause, dev->phy.asym_pause);
 549
 550         /* Default fifo sizes */
 551         tx_size = dev->tx_fifo_size;
 552         rx_size = dev->rx_fifo_size;
 553
 554         /* No link, force loopback */
 555         if (!link)
 556                 mr1 = EMAC_MR1_FDE | EMAC_MR1_ILE;
 557
 558         /* Check for full duplex */
 559         else if (dev->phy.duplex == DUPLEX_FULL)
 560                 mr1 |= EMAC_MR1_FDE | EMAC_MR1_MWSW_001;
 561
 562         /* Adjust fifo sizes, mr1 and timeouts based on link speed */
 563         dev->stop_timeout = STOP_TIMEOUT_10;
 564         switch (dev->phy.speed) {
 565         case SPEED_1000:
 566                 if (emac_phy_gpcs(dev->phy.mode)) {
 567                         mr1 |= EMAC_MR1_MF_1000GPCS | EMAC_MR1_MF_IPPA(
 568                                 (dev->phy.gpcs_address != 0xffffffff) ?
 569                                  dev->phy.gpcs_address : dev->phy.address);
 570
 571                         /* Put some arbitrary OUI, Manuf & Rev IDs so we can
 572                          * identify this GPCS PHY later.
 573                          */
 574                         out_be32(&p->u1.emac4.ipcr, 0xdeadbeef);
 575                 } else
 576                         mr1 |= EMAC_MR1_MF_1000;
 577
 578                 /* Extended fifo sizes */
 579                 tx_size = dev->tx_fifo_size_gige;
 580                 rx_size = dev->rx_fifo_size_gige;
 581
 582                 if (dev->ndev->mtu > ETH_DATA_LEN) {
 583                         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
 584                                 mr1 |= EMAC4_MR1_JPSM;
 585                         else
 586                                 mr1 |= EMAC_MR1_JPSM;
 587                         dev->stop_timeout = STOP_TIMEOUT_1000_JUMBO;
 588                 } else
 589                         dev->stop_timeout = STOP_TIMEOUT_1000;
 590                 break;
 591         case SPEED_100:
 592                 mr1 |= EMAC_MR1_MF_100;
 593                 dev->stop_timeout = STOP_TIMEOUT_100;
 594                 break;
 595         default: /* make gcc happy */
 596                 break;
 597         }
 598
 599         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
 600                 rgmii_set_speed(dev->rgmii_dev, dev->rgmii_port,
 601                                 dev->phy.speed);
 602         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
 603                 zmii_set_speed(dev->zmii_dev, dev->zmii_port, dev->phy.speed);
 604
 605         /* on 40x erratum forces us to NOT use integrated flow control,
 606          * let's hope it works on 44x ;)
 607          */
 608         if (!emac_has_feature(dev, EMAC_FTR_NO_FLOW_CONTROL_40x) &&
 609             dev->phy.duplex == DUPLEX_FULL) {
 610                 if (dev->phy.pause)
 611                         mr1 |= EMAC_MR1_EIFC | EMAC_MR1_APP;
 612                 else if (dev->phy.asym_pause)
 613                         mr1 |= EMAC_MR1_APP;
 614         }
 615
 616         /* Add base settings & fifo sizes & program MR1 */
 617         mr1 |= emac_calc_base_mr1(dev, tx_size, rx_size);
 618         out_be32(&p->mr1, mr1);
 619
 620         /* Set individual MAC address */
 621         out_be32(&p->iahr, (ndev->dev_addr[0] << 8) | ndev->dev_addr[1]);
 622         out_be32(&p->ialr, (ndev->dev_addr[2] << 24) |
 623                  (ndev->dev_addr[3] << 16) | (ndev->dev_addr[4] << 8) |
 624                  ndev->dev_addr[5]);
 625
 626         /* VLAN Tag Protocol ID */
 627         out_be32(&p->vtpid, 0x8100);
 628
 629         /* Receive mode register */
 630         r = emac_iff2rmr(ndev);
 631         if (r & EMAC_RMR_MAE)
 632                 emac_hash_mc(dev);
 633         out_be32(&p->rmr, r);
 634
 635         /* FIFOs thresholds */
 636         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
 637                 r = EMAC4_TMR1((dev->mal_burst_size / dev->fifo_entry_size) + 1,
 638                                tx_size / 2 / dev->fifo_entry_size);
 639         else
 640                 r = EMAC_TMR1((dev->mal_burst_size / dev->fifo_entry_size) + 1,
 641                               tx_size / 2 / dev->fifo_entry_size);
 642         out_be32(&p->tmr1, r);
 643         out_be32(&p->trtr, emac_calc_trtr(dev, tx_size / 2));
 644
 645         /* PAUSE frame is sent when RX FIFO reaches its high-water mark,
 646            there should be still enough space in FIFO to allow the our link
 647            partner time to process this frame and also time to send PAUSE
 648            frame itself.
 649
 650            Here is the worst case scenario for the RX FIFO "headroom"
 651            (from "The Switch Book") (100Mbps, without preamble, inter-frame gap):
 652
 653            1) One maximum-length frame on TX                    1522 bytes
 654            2) One PAUSE frame time                                64 bytes
 655            3) PAUSE frame decode time allowance                   64 bytes
 656            4) One maximum-length frame on RX                    1522 bytes
 657            5) Round-trip propagation delay of the link (100Mb)    15 bytes
 658            ----------
 659            3187 bytes
 660
 661            I chose to set high-water mark to RX_FIFO_SIZE / 4 (1024 bytes)
 662            low-water mark  to RX_FIFO_SIZE / 8 (512 bytes)
 663          */
 664         r = emac_calc_rwmr(dev, rx_size / 8 / dev->fifo_entry_size,
 665                            rx_size / 4 / dev->fifo_entry_size);
 666         out_be32(&p->rwmr, r);
 667
 668         /* Set PAUSE timer to the maximum */
 669         out_be32(&p->ptr, 0xffff);
 670
 671         /* IRQ sources */
 672         r = EMAC_ISR_OVR | EMAC_ISR_BP | EMAC_ISR_SE |
 673                 EMAC_ISR_ALE | EMAC_ISR_BFCS | EMAC_ISR_PTLE | EMAC_ISR_ORE |
 674                 EMAC_ISR_IRE | EMAC_ISR_TE;
 675         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
 676             r |= EMAC4_ISR_TXPE | EMAC4_ISR_RXPE /* | EMAC4_ISR_TXUE |
 677                                                   EMAC4_ISR_RXOE | */;
 678         out_be32(&p->iser,  r);
 679
 680         /* We need to take GPCS PHY out of isolate mode after EMAC reset */
 681         if (emac_phy_gpcs(dev->phy.mode)) {
 682                 if (dev->phy.gpcs_address != 0xffffffff)
 683                         emac_mii_reset_gpcs(&dev->phy);
 684                 else
 685                         emac_mii_reset_phy(&dev->phy);
 686         }
 687
 688         return 0;
 689 }
 690
 691 static void emac_reinitialize(struct emac_instance *dev)
 692 {
 693         DBG(dev, "reinitialize" NL);
 694
 695         emac_netif_stop(dev);
 696         if (!emac_configure(dev)) {
 697                 emac_tx_enable(dev);
 698                 emac_rx_enable(dev);
 699         }
 700         emac_netif_start(dev);
 701 }
 702
 703 static void emac_full_tx_reset(struct emac_instance *dev)
 704 {
 705         DBG(dev, "full_tx_reset" NL);
 706
 707         emac_tx_disable(dev);
 708         mal_disable_tx_channel(dev->mal, dev->mal_tx_chan);
 709         emac_clean_tx_ring(dev);
 710         dev->tx_cnt = dev->tx_slot = dev->ack_slot = 0;
 711
 712         emac_configure(dev);
 713
 714         mal_enable_tx_channel(dev->mal, dev->mal_tx_chan);
 715         emac_tx_enable(dev);
 716         emac_rx_enable(dev);
 717 }
 718
 719 static void emac_reset_work(struct work_struct *work)
 720 {
 721         struct emac_instance *dev = container_of(work, struct emac_instance, reset_work);
 722
 723         DBG(dev, "reset_work" NL);
 724
 725         mutex_lock(&dev->link_lock);
 726         if (dev->opened) {
 727                 emac_netif_stop(dev);
 728                 emac_full_tx_reset(dev);
 729                 emac_netif_start(dev);
 730         }
 731         mutex_unlock(&dev->link_lock);
 732 }
 733
 734 static void emac_tx_timeout(struct net_device *ndev)
 735 {
 736         struct emac_instance *dev = netdev_priv(ndev);
 737
 738         DBG(dev, "tx_timeout" NL);
 739
 740         schedule_work(&dev->reset_work);
 741 }
 742
 743
 744 static inline int emac_phy_done(struct emac_instance *dev, u32 stacr)
 745 {
 746         int done = !!(stacr & EMAC_STACR_OC);
 747
 748         if (emac_has_feature(dev, EMAC_FTR_STACR_OC_INVERT))
 749                 done = !done;
 750
 751         return done;
 752 };
 753
 754 static int __emac_mdio_read(struct emac_instance *dev, u8 id, u8 reg)
 755 {
 756         struct emac_regs __iomem *p = dev->emacp;
 757         u32 r = 0;
 758         int n, err = -ETIMEDOUT;
 759
 760         mutex_lock(&dev->mdio_lock);
 761
 762         DBG2(dev, "mdio_read(%02x,%02x)" NL, id, reg);
 763
 764         /* Enable proper MDIO port */
 765         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
 766                 zmii_get_mdio(dev->zmii_dev, dev->zmii_port);
 767         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
 768                 rgmii_get_mdio(dev->rgmii_dev, dev->rgmii_port);
 769
 770         /* Wait for management interface to become idle */
 771         n = 20;
 772         while (!emac_phy_done(dev, in_be32(&p->stacr))) {
 773                 udelay(1);
 774                 if (!--n) {
 775                         DBG2(dev, " -> timeout wait idle\n");
 776                         goto bail;
 777                 }
 778         }
 779
 780         /* Issue read command */
 781         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
 782                 r = EMAC4_STACR_BASE(dev->opb_bus_freq);
 783         else
 784                 r = EMAC_STACR_BASE(dev->opb_bus_freq);
 785         if (emac_has_feature(dev, EMAC_FTR_STACR_OC_INVERT))
 786                 r |= EMAC_STACR_OC;
 787         if (emac_has_feature(dev, EMAC_FTR_HAS_NEW_STACR))
 788                 r |= EMACX_STACR_STAC_READ;
 789         else
 790                 r |= EMAC_STACR_STAC_READ;
 791         r |= (reg & EMAC_STACR_PRA_MASK)
 792                 | ((id & EMAC_STACR_PCDA_MASK) << EMAC_STACR_PCDA_SHIFT);
 793         out_be32(&p->stacr, r);
 794
 795         /* Wait for read to complete */
 796         n = 200;
 797         while (!emac_phy_done(dev, (r = in_be32(&p->stacr)))) {
 798                 udelay(1);
 799                 if (!--n) {
 800                         DBG2(dev, " -> timeout wait complete\n");
 801                         goto bail;
 802                 }
 803         }
 804
 805         if (unlikely(r & EMAC_STACR_PHYE)) {
 806                 DBG(dev, "mdio_read(%02x, %02x) failed" NL, id, reg);
 807                 err = -EREMOTEIO;
 808                 goto bail;
 809         }
 810
 811         r = ((r >> EMAC_STACR_PHYD_SHIFT) & EMAC_STACR_PHYD_MASK);
 812
 813         DBG2(dev, "mdio_read -> %04x" NL, r);
 814         err = 0;
 815  bail:
 816         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
 817                 rgmii_put_mdio(dev->rgmii_dev, dev->rgmii_port);
 818         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
 819                 zmii_put_mdio(dev->zmii_dev, dev->zmii_port);
 820         mutex_unlock(&dev->mdio_lock);
 821
 822         return err == 0 ? r : err;
 823 }
 824
 825 static void __emac_mdio_write(struct emac_instance *dev, u8 id, u8 reg,
 826                               u16 val)
 827 {
 828         struct emac_regs __iomem *p = dev->emacp;
 829         u32 r = 0;
 830         int n, err = -ETIMEDOUT;
 831
 832         mutex_lock(&dev->mdio_lock);
 833
 834         DBG2(dev, "mdio_write(%02x,%02x,%04x)" NL, id, reg, val);
 835
 836         /* Enable proper MDIO port */
 837         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
 838                 zmii_get_mdio(dev->zmii_dev, dev->zmii_port);
 839         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
 840                 rgmii_get_mdio(dev->rgmii_dev, dev->rgmii_port);
 841
 842         /* Wait for management interface to be idle */
 843         n = 20;
 844         while (!emac_phy_done(dev, in_be32(&p->stacr))) {
 845                 udelay(1);
 846                 if (!--n) {
 847                         DBG2(dev, " -> timeout wait idle\n");
 848                         goto bail;
 849                 }
 850         }
 851
 852         /* Issue write command */
 853         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
 854                 r = EMAC4_STACR_BASE(dev->opb_bus_freq);
 855         else
 856                 r = EMAC_STACR_BASE(dev->opb_bus_freq);
 857         if (emac_has_feature(dev, EMAC_FTR_STACR_OC_INVERT))
 858                 r |= EMAC_STACR_OC;
 859         if (emac_has_feature(dev, EMAC_FTR_HAS_NEW_STACR))
 860                 r |= EMACX_STACR_STAC_WRITE;
 861         else
 862                 r |= EMAC_STACR_STAC_WRITE;
 863         r |= (reg & EMAC_STACR_PRA_MASK) |
 864                 ((id & EMAC_STACR_PCDA_MASK) << EMAC_STACR_PCDA_SHIFT) |
 865                 (val << EMAC_STACR_PHYD_SHIFT);
 866         out_be32(&p->stacr, r);
 867
 868         /* Wait for write to complete */
 869         n = 200;
 870         while (!emac_phy_done(dev, in_be32(&p->stacr))) {
 871                 udelay(1);
 872                 if (!--n) {
 873                         DBG2(dev, " -> timeout wait complete\n");
 874                         goto bail;
 875                 }
 876         }
 877         err = 0;
 878  bail:
 879         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
 880                 rgmii_put_mdio(dev->rgmii_dev, dev->rgmii_port);
 881         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
 882                 zmii_put_mdio(dev->zmii_dev, dev->zmii_port);
 883         mutex_unlock(&dev->mdio_lock);
 884 }
 885
 886 static int emac_mdio_read(struct net_device *ndev, int id, int reg)
 887 {
 888         struct emac_instance *dev = netdev_priv(ndev);
 889         int res;
 890
 891         res = __emac_mdio_read((dev->mdio_instance &&
 892                                 dev->phy.gpcs_address != id) ?
 893                                 dev->mdio_instance : dev,
 894                                (u8) id, (u8) reg);
 895         return res;
 896 }
 897
 898 static void emac_mdio_write(struct net_device *ndev, int id, int reg, int val)
 899 {
 900         struct emac_instance *dev = netdev_priv(ndev);
 901
 902         __emac_mdio_write((dev->mdio_instance &&
 903                            dev->phy.gpcs_address != id) ?
 904                            dev->mdio_instance : dev,
 905                           (u8) id, (u8) reg, (u16) val);
 906 }
 907
 908 /* Tx lock BH */
 909 static void __emac_set_multicast_list(struct emac_instance *dev)
 910 {
 911         struct emac_regs __iomem *p = dev->emacp;
 912         u32 rmr = emac_iff2rmr(dev->ndev);
 913
 914         DBG(dev, "__multicast %08x" NL, rmr);
 915
 916         /* I decided to relax register access rules here to avoid
 917          * full EMAC reset.
 918          *
 919          * There is a real problem with EMAC4 core if we use MWSW_001 bit
 920          * in MR1 register and do a full EMAC reset.
 921          * One TX BD status update is delayed and, after EMAC reset, it
 922          * never happens, resulting in TX hung (it'll be recovered by TX
 923          * timeout handler eventually, but this is just gross).
 924          * So we either have to do full TX reset or try to cheat here :)
 925          *
 926          * The only required change is to RX mode register, so I *think* all
 927          * we need is just to stop RX channel. This seems to work on all
 928          * tested SoCs.                                                --ebs
 929          *
 930          * If we need the full reset, we might just trigger the workqueue
 931          * and do it async... a bit nasty but should work --BenH
 932          */
 933         dev->mcast_pending = 0;
 934         emac_rx_disable(dev);
 935         if (rmr & EMAC_RMR_MAE)
 936                 emac_hash_mc(dev);
 937         out_be32(&p->rmr, rmr);
 938         emac_rx_enable(dev);
 939 }
 940
 941 /* Tx lock BH */
 942 static void emac_set_multicast_list(struct net_device *ndev)
 943 {
 944         struct emac_instance *dev = netdev_priv(ndev);
 945
 946         DBG(dev, "multicast" NL);
 947
 948         BUG_ON(!netif_running(dev->ndev));
 949
 950         if (dev->no_mcast) {
 951                 dev->mcast_pending = 1;
 952                 return;
 953         }
 954         __emac_set_multicast_list(dev);
 955 }
 956
 957 static int emac_resize_rx_ring(struct emac_instance *dev, int new_mtu)
 958 {
 959         int rx_sync_size = emac_rx_sync_size(new_mtu);
 960         int rx_skb_size = emac_rx_skb_size(new_mtu);
 961         int i, ret = 0;
 962
 963         mutex_lock(&dev->link_lock);
 964         emac_netif_stop(dev);
 965         emac_rx_disable(dev);
 966         mal_disable_rx_channel(dev->mal, dev->mal_rx_chan);
 967
 968         if (dev->rx_sg_skb) {
 969                 ++dev->estats.rx_dropped_resize;
 970                 dev_kfree_skb(dev->rx_sg_skb);
 971                 dev->rx_sg_skb = NULL;
 972         }
 973
 974         /* Make a first pass over RX ring and mark BDs ready, dropping
 975          * non-processed packets on the way. We need this as a separate pass
 976          * to simplify error recovery in the case of allocation failure later.
 977          */
 978         for (i = 0; i < NUM_RX_BUFF; ++i) {
 979                 if (dev->rx_desc[i].ctrl & MAL_RX_CTRL_FIRST)
 980                         ++dev->estats.rx_dropped_resize;
 981
 982                 dev->rx_desc[i].data_len = 0;
 983                 dev->rx_desc[i].ctrl = MAL_RX_CTRL_EMPTY |
 984                     (i == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
 985         }
 986
 987         /* Reallocate RX ring only if bigger skb buffers are required */
 988         if (rx_skb_size <= dev->rx_skb_size)
 989                 goto skip;
 990
 991         /* Second pass, allocate new skbs */
 992         for (i = 0; i < NUM_RX_BUFF; ++i) {
 993                 struct sk_buff *skb = alloc_skb(rx_skb_size, GFP_ATOMIC);
 994                 if (!skb) {
 995                         ret = -ENOMEM;
 996                         goto oom;
 997                 }
 998
 999                 BUG_ON(!dev->rx_skb[i]);
1000                 dev_kfree_skb(dev->rx_skb[i]);
1001
1002                 skb_reserve(skb, EMAC_RX_SKB_HEADROOM + 2);
1003                 dev->rx_desc[i].data_ptr =
1004                     dma_map_single(&dev->ofdev->dev, skb->data - 2, rx_sync_size,
1005                                    DMA_FROM_DEVICE) + 2;
1006                 dev->rx_skb[i] = skb;
1007         }
1008  skip:
1009         /* Check if we need to change "Jumbo" bit in MR1 */
1010         if ((new_mtu > ETH_DATA_LEN) ^ (dev->ndev->mtu > ETH_DATA_LEN)) {
1011                 /* This is to prevent starting RX channel in emac_rx_enable() */
1012                 set_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1013
1014                 dev->ndev->mtu = new_mtu;
1015                 emac_full_tx_reset(dev);
1016         }
1017
1018         mal_set_rcbs(dev->mal, dev->mal_rx_chan, emac_rx_size(new_mtu));
1019  oom:
1020         /* Restart RX */
1021         clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1022         dev->rx_slot = 0;
1023         mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1024         emac_rx_enable(dev);
1025         emac_netif_start(dev);
1026         mutex_unlock(&dev->link_lock);
1027
1028         return ret;
1029 }
1030
1031 /* Process ctx, rtnl_lock semaphore */
1032 static int emac_change_mtu(struct net_device *ndev, int new_mtu)
1033 {
1034         struct emac_instance *dev = netdev_priv(ndev);
1035         int ret = 0;
1036
1037         if (new_mtu < EMAC_MIN_MTU || new_mtu > dev->max_mtu)
1038                 return -EINVAL;
1039
1040         DBG(dev, "change_mtu(%d)" NL, new_mtu);
1041
1042         if (netif_running(ndev)) {
1043                 /* Check if we really need to reinitalize RX ring */
1044                 if (emac_rx_skb_size(ndev->mtu) != emac_rx_skb_size(new_mtu))
1045                         ret = emac_resize_rx_ring(dev, new_mtu);
1046         }
1047
1048         if (!ret) {
1049                 ndev->mtu = new_mtu;
1050                 dev->rx_skb_size = emac_rx_skb_size(new_mtu);
1051                 dev->rx_sync_size = emac_rx_sync_size(new_mtu);
1052         }
1053
1054         return ret;
1055 }
1056
1057 static void emac_clean_tx_ring(struct emac_instance *dev)
1058 {
1059         int i;
1060
1061         for (i = 0; i < NUM_TX_BUFF; ++i) {
1062                 if (dev->tx_skb[i]) {
1063                         dev_kfree_skb(dev->tx_skb[i]);
1064                         dev->tx_skb[i] = NULL;
1065                         if (dev->tx_desc[i].ctrl & MAL_TX_CTRL_READY)
1066                                 ++dev->estats.tx_dropped;
1067                 }
1068                 dev->tx_desc[i].ctrl = 0;
1069                 dev->tx_desc[i].data_ptr = 0;
1070         }
1071 }
1072
1073 static void emac_clean_rx_ring(struct emac_instance *dev)
1074 {
1075         int i;
1076
1077         for (i = 0; i < NUM_RX_BUFF; ++i)
1078                 if (dev->rx_skb[i]) {
1079                         dev->rx_desc[i].ctrl = 0;
1080                         dev_kfree_skb(dev->rx_skb[i]);
1081                         dev->rx_skb[i] = NULL;
1082                         dev->rx_desc[i].data_ptr = 0;
1083                 }
1084
1085         if (dev->rx_sg_skb) {
1086                 dev_kfree_skb(dev->rx_sg_skb);
1087                 dev->rx_sg_skb = NULL;
1088         }
1089 }
1090
1091 static inline int emac_alloc_rx_skb(struct emac_instance *dev, int slot,
1092                                     gfp_t flags)
1093 {
1094         struct sk_buff *skb = alloc_skb(dev->rx_skb_size, flags);
1095         if (unlikely(!skb))
1096                 return -ENOMEM;
1097
1098         dev->rx_skb[slot] = skb;
1099         dev->rx_desc[slot].data_len = 0;
1100
1101         skb_reserve(skb, EMAC_RX_SKB_HEADROOM + 2);
1102         dev->rx_desc[slot].data_ptr =
1103             dma_map_single(&dev->ofdev->dev, skb->data - 2, dev->rx_sync_size,
1104                            DMA_FROM_DEVICE) + 2;
1105         wmb();
1106         dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
1107             (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1108
1109         return 0;
1110 }
1111
1112 static void emac_print_link_status(struct emac_instance *dev)
1113 {
1114         if (netif_carrier_ok(dev->ndev))
1115                 printk(KERN_INFO "%s: link is up, %d %s%s\n",
1116                        dev->ndev->name, dev->phy.speed,
1117                        dev->phy.duplex == DUPLEX_FULL ? "FDX" : "HDX",
1118                        dev->phy.pause ? ", pause enabled" :
1119                        dev->phy.asym_pause ? ", asymmetric pause enabled" : "");
1120         else
1121                 printk(KERN_INFO "%s: link is down\n", dev->ndev->name);
1122 }
1123
1124 /* Process ctx, rtnl_lock semaphore */
1125 static int emac_open(struct net_device *ndev)
1126 {
1127         struct emac_instance *dev = netdev_priv(ndev);
1128         int err, i;
1129
1130         DBG(dev, "open" NL);
1131
1132         /* Setup error IRQ handler */
1133         err = request_irq(dev->emac_irq, emac_irq, 0, "EMAC", dev);
1134         if (err) {
1135                 printk(KERN_ERR "%s: failed to request IRQ %d\n",
1136                        ndev->name, dev->emac_irq);
1137                 return err;
1138         }
1139
1140         /* Allocate RX ring */
1141         for (i = 0; i < NUM_RX_BUFF; ++i)
1142                 if (emac_alloc_rx_skb(dev, i, GFP_KERNEL)) {
1143                         printk(KERN_ERR "%s: failed to allocate RX ring\n",
1144                                ndev->name);
1145                         goto oom;
1146                 }
1147
1148         dev->tx_cnt = dev->tx_slot = dev->ack_slot = dev->rx_slot = 0;
1149         clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1150         dev->rx_sg_skb = NULL;
1151
1152         mutex_lock(&dev->link_lock);
1153         dev->opened = 1;
1154
1155         /* Start PHY polling now.
1156          */
1157         if (dev->phy.address >= 0) {
1158                 int link_poll_interval;
1159                 if (dev->phy.def->ops->poll_link(&dev->phy)) {
1160                         dev->phy.def->ops->read_link(&dev->phy);
1161                         emac_rx_clk_default(dev);
1162                         netif_carrier_on(dev->ndev);
1163                         link_poll_interval = PHY_POLL_LINK_ON;
1164                 } else {
1165                         emac_rx_clk_tx(dev);
1166                         netif_carrier_off(dev->ndev);
1167                         link_poll_interval = PHY_POLL_LINK_OFF;
1168                 }
1169                 dev->link_polling = 1;
1170                 wmb();
1171                 schedule_delayed_work(&dev->link_work, link_poll_interval);
1172                 emac_print_link_status(dev);
1173         } else
1174                 netif_carrier_on(dev->ndev);
1175
1176         /* Required for Pause packet support in EMAC */
1177         dev_mc_add(ndev, default_mcast_addr, sizeof(default_mcast_addr), 1);
1178
1179         emac_configure(dev);
1180         mal_poll_add(dev->mal, &dev->commac);
1181         mal_enable_tx_channel(dev->mal, dev->mal_tx_chan);
1182         mal_set_rcbs(dev->mal, dev->mal_rx_chan, emac_rx_size(ndev->mtu));
1183         mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1184         emac_tx_enable(dev);
1185         emac_rx_enable(dev);
1186         emac_netif_start(dev);
1187
1188         mutex_unlock(&dev->link_lock);
1189
1190         return 0;
1191  oom:
1192         emac_clean_rx_ring(dev);
1193         free_irq(dev->emac_irq, dev);
1194
1195         return -ENOMEM;
1196 }
1197
1198 /* BHs disabled */
1199 #if 0
1200 static int emac_link_differs(struct emac_instance *dev)
1201 {
1202         u32 r = in_be32(&dev->emacp->mr1);
1203
1204         int duplex = r & EMAC_MR1_FDE ? DUPLEX_FULL : DUPLEX_HALF;
1205         int speed, pause, asym_pause;
1206
1207         if (r & EMAC_MR1_MF_1000)
1208                 speed = SPEED_1000;
1209         else if (r & EMAC_MR1_MF_100)
1210                 speed = SPEED_100;
1211         else
1212                 speed = SPEED_10;
1213
1214         switch (r & (EMAC_MR1_EIFC | EMAC_MR1_APP)) {
1215         case (EMAC_MR1_EIFC | EMAC_MR1_APP):
1216                 pause = 1;
1217                 asym_pause = 0;
1218                 break;
1219         case EMAC_MR1_APP:
1220                 pause = 0;
1221                 asym_pause = 1;
1222                 break;
1223         default:
1224                 pause = asym_pause = 0;
1225         }
1226         return speed != dev->phy.speed || duplex != dev->phy.duplex ||
1227             pause != dev->phy.pause || asym_pause != dev->phy.asym_pause;
1228 }
1229 #endif
1230
1231 static void emac_link_timer(struct work_struct *work)
1232 {
1233         struct emac_instance *dev =
1234                 container_of((struct delayed_work *)work,
1235                              struct emac_instance, link_work);
1236         int link_poll_interval;
1237
1238         mutex_lock(&dev->link_lock);
1239         DBG2(dev, "link timer" NL);
1240
1241         if (!dev->opened)
1242                 goto bail;
1243
1244         if (dev->phy.def->ops->poll_link(&dev->phy)) {
1245                 if (!netif_carrier_ok(dev->ndev)) {
1246                         emac_rx_clk_default(dev);
1247                         /* Get new link parameters */
1248                         dev->phy.def->ops->read_link(&dev->phy);
1249
1250                         netif_carrier_on(dev->ndev);
1251                         emac_netif_stop(dev);
1252                         emac_full_tx_reset(dev);
1253                         emac_netif_start(dev);
1254                         emac_print_link_status(dev);
1255                 }
1256                 link_poll_interval = PHY_POLL_LINK_ON;
1257         } else {
1258                 if (netif_carrier_ok(dev->ndev)) {
1259                         emac_rx_clk_tx(dev);
1260                         netif_carrier_off(dev->ndev);
1261                         netif_tx_disable(dev->ndev);
1262                         emac_reinitialize(dev);
1263                         emac_print_link_status(dev);
1264                 }
1265                 link_poll_interval = PHY_POLL_LINK_OFF;
1266         }
1267         schedule_delayed_work(&dev->link_work, link_poll_interval);
1268  bail:
1269         mutex_unlock(&dev->link_lock);
1270 }
1271
1272 static void emac_force_link_update(struct emac_instance *dev)
1273 {
1274         netif_carrier_off(dev->ndev);
1275         smp_rmb();
1276         if (dev->link_polling) {
1277                 cancel_rearming_delayed_work(&dev->link_work);
1278                 if (dev->link_polling)
1279                         schedule_delayed_work(&dev->link_work,  PHY_POLL_LINK_OFF);
1280         }
1281 }
1282
1283 /* Process ctx, rtnl_lock semaphore */
1284 static int emac_close(struct net_device *ndev)
1285 {
1286         struct emac_instance *dev = netdev_priv(ndev);
1287
1288         DBG(dev, "close" NL);
1289
1290         if (dev->phy.address >= 0) {
1291                 dev->link_polling = 0;
1292                 cancel_rearming_delayed_work(&dev->link_work);
1293         }
1294         mutex_lock(&dev->link_lock);
1295         emac_netif_stop(dev);
1296         dev->opened = 0;
1297         mutex_unlock(&dev->link_lock);
1298
1299         emac_rx_disable(dev);
1300         emac_tx_disable(dev);
1301         mal_disable_rx_channel(dev->mal, dev->mal_rx_chan);
1302         mal_disable_tx_channel(dev->mal, dev->mal_tx_chan);
1303         mal_poll_del(dev->mal, &dev->commac);
1304
1305         emac_clean_tx_ring(dev);
1306         emac_clean_rx_ring(dev);
1307
1308         free_irq(dev->emac_irq, dev);
1309
1310         return 0;
1311 }
1312
1313 static inline u16 emac_tx_csum(struct emac_instance *dev,
1314                                struct sk_buff *skb)
1315 {
1316         if (emac_has_feature(dev, EMAC_FTR_HAS_TAH) &&
1317                 (skb->ip_summed == CHECKSUM_PARTIAL)) {
1318                 ++dev->stats.tx_packets_csum;
1319                 return EMAC_TX_CTRL_TAH_CSUM;
1320         }
1321         return 0;
1322 }
1323
1324 static inline int emac_xmit_finish(struct emac_instance *dev, int len)
1325 {
1326         struct emac_regs __iomem *p = dev->emacp;
1327         struct net_device *ndev = dev->ndev;
1328
1329         /* Send the packet out. If the if makes a significant perf
1330          * difference, then we can store the TMR0 value in "dev"
1331          * instead
1332          */
1333         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
1334                 out_be32(&p->tmr0, EMAC4_TMR0_XMIT);
1335         else
1336                 out_be32(&p->tmr0, EMAC_TMR0_XMIT);
1337
1338         if (unlikely(++dev->tx_cnt == NUM_TX_BUFF)) {
1339                 netif_stop_queue(ndev);
1340                 DBG2(dev, "stopped TX queue" NL);
1341         }
1342
1343         ndev->trans_start = jiffies;
1344         ++dev->stats.tx_packets;
1345         dev->stats.tx_bytes += len;
1346
1347         return 0;
1348 }
1349
1350 /* Tx lock BH */
1351 static int emac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1352 {
1353         struct emac_instance *dev = netdev_priv(ndev);
1354         unsigned int len = skb->len;
1355         int slot;
1356
1357         u16 ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1358             MAL_TX_CTRL_LAST | emac_tx_csum(dev, skb);
1359
1360         slot = dev->tx_slot++;
1361         if (dev->tx_slot == NUM_TX_BUFF) {
1362                 dev->tx_slot = 0;
1363                 ctrl |= MAL_TX_CTRL_WRAP;
1364         }
1365
1366         DBG2(dev, "xmit(%u) %d" NL, len, slot);
1367
1368         dev->tx_skb[slot] = skb;
1369         dev->tx_desc[slot].data_ptr = dma_map_single(&dev->ofdev->dev,
1370                                                      skb->data, len,
1371                                                      DMA_TO_DEVICE);
1372         dev->tx_desc[slot].data_len = (u16) len;
1373         wmb();
1374         dev->tx_desc[slot].ctrl = ctrl;
1375
1376         return emac_xmit_finish(dev, len);
1377 }
1378
1379 static inline int emac_xmit_split(struct emac_instance *dev, int slot,
1380                                   u32 pd, int len, int last, u16 base_ctrl)
1381 {
1382         while (1) {
1383                 u16 ctrl = base_ctrl;
1384                 int chunk = min(len, MAL_MAX_TX_SIZE);
1385                 len -= chunk;
1386
1387                 slot = (slot + 1) % NUM_TX_BUFF;
1388
1389                 if (last && !len)
1390                         ctrl |= MAL_TX_CTRL_LAST;
1391                 if (slot == NUM_TX_BUFF - 1)
1392                         ctrl |= MAL_TX_CTRL_WRAP;
1393
1394                 dev->tx_skb[slot] = NULL;
1395                 dev->tx_desc[slot].data_ptr = pd;
1396                 dev->tx_desc[slot].data_len = (u16) chunk;
1397                 dev->tx_desc[slot].ctrl = ctrl;
1398                 ++dev->tx_cnt;
1399
1400                 if (!len)
1401                         break;
1402
1403                 pd += chunk;
1404         }
1405         return slot;
1406 }
1407
1408 /* Tx lock BH disabled (SG version for TAH equipped EMACs) */
1409 static int emac_start_xmit_sg(struct sk_buff *skb, struct net_device *ndev)
1410 {
1411         struct emac_instance *dev = netdev_priv(ndev);
1412         int nr_frags = skb_shinfo(skb)->nr_frags;
1413         int len = skb->len, chunk;
1414         int slot, i;
1415         u16 ctrl;
1416         u32 pd;
1417
1418         /* This is common "fast" path */
1419         if (likely(!nr_frags && len <= MAL_MAX_TX_SIZE))
1420                 return emac_start_xmit(skb, ndev);
1421
1422         len -= skb->data_len;
1423
1424         /* Note, this is only an *estimation*, we can still run out of empty
1425          * slots because of the additional fragmentation into
1426          * MAL_MAX_TX_SIZE-sized chunks
1427          */
1428         if (unlikely(dev->tx_cnt + nr_frags + mal_tx_chunks(len) > NUM_TX_BUFF))
1429                 goto stop_queue;
1430
1431         ctrl = EMAC_TX_CTRL_GFCS | EMAC_TX_CTRL_GP | MAL_TX_CTRL_READY |
1432             emac_tx_csum(dev, skb);
1433         slot = dev->tx_slot;
1434
1435         /* skb data */
1436         dev->tx_skb[slot] = NULL;
1437         chunk = min(len, MAL_MAX_TX_SIZE);
1438         dev->tx_desc[slot].data_ptr = pd =
1439             dma_map_single(&dev->ofdev->dev, skb->data, len, DMA_TO_DEVICE);
1440         dev->tx_desc[slot].data_len = (u16) chunk;
1441         len -= chunk;
1442         if (unlikely(len))
1443                 slot = emac_xmit_split(dev, slot, pd + chunk, len, !nr_frags,
1444                                        ctrl);
1445         /* skb fragments */
1446         for (i = 0; i < nr_frags; ++i) {
1447                 struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
1448                 len = frag->size;
1449
1450                 if (unlikely(dev->tx_cnt + mal_tx_chunks(len) >= NUM_TX_BUFF))
1451                         goto undo_frame;
1452
1453                 pd = dma_map_page(&dev->ofdev->dev, frag->page, frag->page_offset, len,
1454                                   DMA_TO_DEVICE);
1455
1456                 slot = emac_xmit_split(dev, slot, pd, len, i == nr_frags - 1,
1457                                        ctrl);
1458         }
1459
1460         DBG2(dev, "xmit_sg(%u) %d - %d" NL, skb->len, dev->tx_slot, slot);
1461
1462         /* Attach skb to the last slot so we don't release it too early */
1463         dev->tx_skb[slot] = skb;
1464
1465         /* Send the packet out */
1466         if (dev->tx_slot == NUM_TX_BUFF - 1)
1467                 ctrl |= MAL_TX_CTRL_WRAP;
1468         wmb();
1469         dev->tx_desc[dev->tx_slot].ctrl = ctrl;
1470         dev->tx_slot = (slot + 1) % NUM_TX_BUFF;
1471
1472         return emac_xmit_finish(dev, skb->len);
1473
1474  undo_frame:
1475         /* Well, too bad. Our previous estimation was overly optimistic.
1476          * Undo everything.
1477          */
1478         while (slot != dev->tx_slot) {
1479                 dev->tx_desc[slot].ctrl = 0;
1480                 --dev->tx_cnt;
1481                 if (--slot < 0)
1482                         slot = NUM_TX_BUFF - 1;
1483         }
1484         ++dev->estats.tx_undo;
1485
1486  stop_queue:
1487         netif_stop_queue(ndev);
1488         DBG2(dev, "stopped TX queue" NL);
1489         return 1;
1490 }
1491
1492 /* Tx lock BHs */
1493 static void emac_parse_tx_error(struct emac_instance *dev, u16 ctrl)
1494 {
1495         struct emac_error_stats *st = &dev->estats;
1496
1497         DBG(dev, "BD TX error %04x" NL, ctrl);
1498
1499         ++st->tx_bd_errors;
1500         if (ctrl & EMAC_TX_ST_BFCS)
1501                 ++st->tx_bd_bad_fcs;
1502         if (ctrl & EMAC_TX_ST_LCS)
1503                 ++st->tx_bd_carrier_loss;
1504         if (ctrl & EMAC_TX_ST_ED)
1505                 ++st->tx_bd_excessive_deferral;
1506         if (ctrl & EMAC_TX_ST_EC)
1507                 ++st->tx_bd_excessive_collisions;
1508         if (ctrl & EMAC_TX_ST_LC)
1509                 ++st->tx_bd_late_collision;
1510         if (ctrl & EMAC_TX_ST_MC)
1511                 ++st->tx_bd_multple_collisions;
1512         if (ctrl & EMAC_TX_ST_SC)
1513                 ++st->tx_bd_single_collision;
1514         if (ctrl & EMAC_TX_ST_UR)
1515                 ++st->tx_bd_underrun;
1516         if (ctrl & EMAC_TX_ST_SQE)
1517                 ++st->tx_bd_sqe;
1518 }
1519
1520 static void emac_poll_tx(void *param)
1521 {
1522         struct emac_instance *dev = param;
1523         u32 bad_mask;
1524
1525         DBG2(dev, "poll_tx, %d %d" NL, dev->tx_cnt, dev->ack_slot);
1526
1527         if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
1528                 bad_mask = EMAC_IS_BAD_TX_TAH;
1529         else
1530                 bad_mask = EMAC_IS_BAD_TX;
1531
1532         netif_tx_lock_bh(dev->ndev);
1533         if (dev->tx_cnt) {
1534                 u16 ctrl;
1535                 int slot = dev->ack_slot, n = 0;
1536         again:
1537                 ctrl = dev->tx_desc[slot].ctrl;
1538                 if (!(ctrl & MAL_TX_CTRL_READY)) {
1539                         struct sk_buff *skb = dev->tx_skb[slot];
1540                         ++n;
1541
1542                         if (skb) {
1543                                 dev_kfree_skb(skb);
1544                                 dev->tx_skb[slot] = NULL;
1545                         }
1546                         slot = (slot + 1) % NUM_TX_BUFF;
1547
1548                         if (unlikely(ctrl & bad_mask))
1549                                 emac_parse_tx_error(dev, ctrl);
1550
1551                         if (--dev->tx_cnt)
1552                                 goto again;
1553                 }
1554                 if (n) {
1555                         dev->ack_slot = slot;
1556                         if (netif_queue_stopped(dev->ndev) &&
1557                             dev->tx_cnt < EMAC_TX_WAKEUP_THRESH)
1558                                 netif_wake_queue(dev->ndev);
1559
1560                         DBG2(dev, "tx %d pkts" NL, n);
1561                 }
1562         }
1563         netif_tx_unlock_bh(dev->ndev);
1564 }
1565
1566 static inline void emac_recycle_rx_skb(struct emac_instance *dev, int slot,
1567                                        int len)
1568 {
1569         struct sk_buff *skb = dev->rx_skb[slot];
1570
1571         DBG2(dev, "recycle %d %d" NL, slot, len);
1572
1573         if (len)
1574                 dma_map_single(&dev->ofdev->dev, skb->data - 2,
1575                                EMAC_DMA_ALIGN(len + 2), DMA_FROM_DEVICE);
1576
1577         dev->rx_desc[slot].data_len = 0;
1578         wmb();
1579         dev->rx_desc[slot].ctrl = MAL_RX_CTRL_EMPTY |
1580             (slot == (NUM_RX_BUFF - 1) ? MAL_RX_CTRL_WRAP : 0);
1581 }
1582
1583 static void emac_parse_rx_error(struct emac_instance *dev, u16 ctrl)
1584 {
1585         struct emac_error_stats *st = &dev->estats;
1586
1587         DBG(dev, "BD RX error %04x" NL, ctrl);
1588
1589         ++st->rx_bd_errors;
1590         if (ctrl & EMAC_RX_ST_OE)
1591                 ++st->rx_bd_overrun;
1592         if (ctrl & EMAC_RX_ST_BP)
1593                 ++st->rx_bd_bad_packet;
1594         if (ctrl & EMAC_RX_ST_RP)
1595                 ++st->rx_bd_runt_packet;
1596         if (ctrl & EMAC_RX_ST_SE)
1597                 ++st->rx_bd_short_event;
1598         if (ctrl & EMAC_RX_ST_AE)
1599                 ++st->rx_bd_alignment_error;
1600         if (ctrl & EMAC_RX_ST_BFCS)
1601                 ++st->rx_bd_bad_fcs;
1602         if (ctrl & EMAC_RX_ST_PTL)
1603                 ++st->rx_bd_packet_too_long;
1604         if (ctrl & EMAC_RX_ST_ORE)
1605                 ++st->rx_bd_out_of_range;
1606         if (ctrl & EMAC_RX_ST_IRE)
1607                 ++st->rx_bd_in_range;
1608 }
1609
1610 static inline void emac_rx_csum(struct emac_instance *dev,
1611                                 struct sk_buff *skb, u16 ctrl)
1612 {
1613 #ifdef CONFIG_IBM_NEW_EMAC_TAH
1614         if (!ctrl && dev->tah_dev) {
1615                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1616                 ++dev->stats.rx_packets_csum;
1617         }
1618 #endif
1619 }
1620
1621 static inline int emac_rx_sg_append(struct emac_instance *dev, int slot)
1622 {
1623         if (likely(dev->rx_sg_skb != NULL)) {
1624                 int len = dev->rx_desc[slot].data_len;
1625                 int tot_len = dev->rx_sg_skb->len + len;
1626
1627                 if (unlikely(tot_len + 2 > dev->rx_skb_size)) {
1628                         ++dev->estats.rx_dropped_mtu;
1629                         dev_kfree_skb(dev->rx_sg_skb);
1630                         dev->rx_sg_skb = NULL;
1631                 } else {
1632                         cacheable_memcpy(skb_tail_pointer(dev->rx_sg_skb),
1633                                          dev->rx_skb[slot]->data, len);
1634                         skb_put(dev->rx_sg_skb, len);
1635                         emac_recycle_rx_skb(dev, slot, len);
1636                         return 0;
1637                 }
1638         }
1639         emac_recycle_rx_skb(dev, slot, 0);
1640         return -1;
1641 }
1642
1643 /* NAPI poll context */
1644 static int emac_poll_rx(void *param, int budget)
1645 {
1646         struct emac_instance *dev = param;
1647         int slot = dev->rx_slot, received = 0;
1648
1649         DBG2(dev, "poll_rx(%d)" NL, budget);
1650
1651  again:
1652         while (budget > 0) {
1653                 int len;
1654                 struct sk_buff *skb;
1655                 u16 ctrl = dev->rx_desc[slot].ctrl;
1656
1657                 if (ctrl & MAL_RX_CTRL_EMPTY)
1658                         break;
1659
1660                 skb = dev->rx_skb[slot];
1661                 mb();
1662                 len = dev->rx_desc[slot].data_len;
1663
1664                 if (unlikely(!MAL_IS_SINGLE_RX(ctrl)))
1665                         goto sg;
1666
1667                 ctrl &= EMAC_BAD_RX_MASK;
1668                 if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1669                         emac_parse_rx_error(dev, ctrl);
1670                         ++dev->estats.rx_dropped_error;
1671                         emac_recycle_rx_skb(dev, slot, 0);
1672                         len = 0;
1673                         goto next;
1674                 }
1675
1676                 if (len < ETH_HLEN) {
1677                         ++dev->estats.rx_dropped_stack;
1678                         emac_recycle_rx_skb(dev, slot, len);
1679                         goto next;
1680                 }
1681
1682                 if (len && len < EMAC_RX_COPY_THRESH) {
1683                         struct sk_buff *copy_skb =
1684                             alloc_skb(len + EMAC_RX_SKB_HEADROOM + 2, GFP_ATOMIC);
1685                         if (unlikely(!copy_skb))
1686                                 goto oom;
1687
1688                         skb_reserve(copy_skb, EMAC_RX_SKB_HEADROOM + 2);
1689                         cacheable_memcpy(copy_skb->data - 2, skb->data - 2,
1690                                          len + 2);
1691                         emac_recycle_rx_skb(dev, slot, len);
1692                         skb = copy_skb;
1693                 } else if (unlikely(emac_alloc_rx_skb(dev, slot, GFP_ATOMIC)))
1694                         goto oom;
1695
1696                 skb_put(skb, len);
1697         push_packet:
1698                 skb->dev = dev->ndev;
1699                 skb->protocol = eth_type_trans(skb, dev->ndev);
1700                 emac_rx_csum(dev, skb, ctrl);
1701
1702                 if (unlikely(netif_receive_skb(skb) == NET_RX_DROP))
1703                         ++dev->estats.rx_dropped_stack;
1704         next:
1705                 ++dev->stats.rx_packets;
1706         skip:
1707                 dev->stats.rx_bytes += len;
1708                 slot = (slot + 1) % NUM_RX_BUFF;
1709                 --budget;
1710                 ++received;
1711                 continue;
1712         sg:
1713                 if (ctrl & MAL_RX_CTRL_FIRST) {
1714                         BUG_ON(dev->rx_sg_skb);
1715                         if (unlikely(emac_alloc_rx_skb(dev, slot, GFP_ATOMIC))) {
1716                                 DBG(dev, "rx OOM %d" NL, slot);
1717                                 ++dev->estats.rx_dropped_oom;
1718                                 emac_recycle_rx_skb(dev, slot, 0);
1719                         } else {
1720                                 dev->rx_sg_skb = skb;
1721                                 skb_put(skb, len);
1722                         }
1723                 } else if (!emac_rx_sg_append(dev, slot) &&
1724                            (ctrl & MAL_RX_CTRL_LAST)) {
1725
1726                         skb = dev->rx_sg_skb;
1727                         dev->rx_sg_skb = NULL;
1728
1729                         ctrl &= EMAC_BAD_RX_MASK;
1730                         if (unlikely(ctrl && ctrl != EMAC_RX_TAH_BAD_CSUM)) {
1731                                 emac_parse_rx_error(dev, ctrl);
1732                                 ++dev->estats.rx_dropped_error;
1733                                 dev_kfree_skb(skb);
1734                                 len = 0;
1735                         } else
1736                                 goto push_packet;
1737                 }
1738                 goto skip;
1739         oom:
1740                 DBG(dev, "rx OOM %d" NL, slot);
1741                 /* Drop the packet and recycle skb */
1742                 ++dev->estats.rx_dropped_oom;
1743                 emac_recycle_rx_skb(dev, slot, 0);
1744                 goto next;
1745         }
1746
1747         if (received) {
1748                 DBG2(dev, "rx %d BDs" NL, received);
1749                 dev->rx_slot = slot;
1750         }
1751
1752         if (unlikely(budget && test_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags))) {
1753                 mb();
1754                 if (!(dev->rx_desc[slot].ctrl & MAL_RX_CTRL_EMPTY)) {
1755                         DBG2(dev, "rx restart" NL);
1756                         received = 0;
1757                         goto again;
1758                 }
1759
1760                 if (dev->rx_sg_skb) {
1761                         DBG2(dev, "dropping partial rx packet" NL);
1762                         ++dev->estats.rx_dropped_error;
1763                         dev_kfree_skb(dev->rx_sg_skb);
1764                         dev->rx_sg_skb = NULL;
1765                 }
1766
1767                 clear_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
1768                 mal_enable_rx_channel(dev->mal, dev->mal_rx_chan);
1769                 emac_rx_enable(dev);
1770                 dev->rx_slot = 0;
1771         }
1772         return received;
1773 }
1774
1775 /* NAPI poll context */
1776 static int emac_peek_rx(void *param)
1777 {
1778         struct emac_instance *dev = param;
1779
1780         return !(dev->rx_desc[dev->rx_slot].ctrl & MAL_RX_CTRL_EMPTY);
1781 }
1782
1783 /* NAPI poll context */
1784 static int emac_peek_rx_sg(void *param)
1785 {
1786         struct emac_instance *dev = param;
1787
1788         int slot = dev->rx_slot;
1789         while (1) {
1790                 u16 ctrl = dev->rx_desc[slot].ctrl;
1791                 if (ctrl & MAL_RX_CTRL_EMPTY)
1792                         return 0;
1793                 else if (ctrl & MAL_RX_CTRL_LAST)
1794                         return 1;
1795
1796                 slot = (slot + 1) % NUM_RX_BUFF;
1797
1798                 /* I'm just being paranoid here :) */
1799                 if (unlikely(slot == dev->rx_slot))
1800                         return 0;
1801         }
1802 }
1803
1804 /* Hard IRQ */
1805 static void emac_rxde(void *param)
1806 {
1807         struct emac_instance *dev = param;
1808
1809         ++dev->estats.rx_stopped;
1810         emac_rx_disable_async(dev);
1811 }
1812
1813 /* Hard IRQ */
1814 static irqreturn_t emac_irq(int irq, void *dev_instance)
1815 {
1816         struct emac_instance *dev = dev_instance;
1817         struct emac_regs __iomem *p = dev->emacp;
1818         struct emac_error_stats *st = &dev->estats;
1819         u32 isr;
1820
1821         spin_lock(&dev->lock);
1822
1823         isr = in_be32(&p->isr);
1824         out_be32(&p->isr, isr);
1825
1826         DBG(dev, "isr = %08x" NL, isr);
1827
1828         if (isr & EMAC4_ISR_TXPE)
1829                 ++st->tx_parity;
1830         if (isr & EMAC4_ISR_RXPE)
1831                 ++st->rx_parity;
1832         if (isr & EMAC4_ISR_TXUE)
1833                 ++st->tx_underrun;
1834         if (isr & EMAC4_ISR_RXOE)
1835                 ++st->rx_fifo_overrun;
1836         if (isr & EMAC_ISR_OVR)
1837                 ++st->rx_overrun;
1838         if (isr & EMAC_ISR_BP)
1839                 ++st->rx_bad_packet;
1840         if (isr & EMAC_ISR_RP)
1841                 ++st->rx_runt_packet;
1842         if (isr & EMAC_ISR_SE)
1843                 ++st->rx_short_event;
1844         if (isr & EMAC_ISR_ALE)
1845                 ++st->rx_alignment_error;
1846         if (isr & EMAC_ISR_BFCS)
1847                 ++st->rx_bad_fcs;
1848         if (isr & EMAC_ISR_PTLE)
1849                 ++st->rx_packet_too_long;
1850         if (isr & EMAC_ISR_ORE)
1851                 ++st->rx_out_of_range;
1852         if (isr & EMAC_ISR_IRE)
1853                 ++st->rx_in_range;
1854         if (isr & EMAC_ISR_SQE)
1855                 ++st->tx_sqe;
1856         if (isr & EMAC_ISR_TE)
1857                 ++st->tx_errors;
1858
1859         spin_unlock(&dev->lock);
1860
1861         return IRQ_HANDLED;
1862 }
1863
1864 static struct net_device_stats *emac_stats(struct net_device *ndev)
1865 {
1866         struct emac_instance *dev = netdev_priv(ndev);
1867         struct emac_stats *st = &dev->stats;
1868         struct emac_error_stats *est = &dev->estats;
1869         struct net_device_stats *nst = &dev->nstats;
1870         unsigned long flags;
1871
1872         DBG2(dev, "stats" NL);
1873
1874         /* Compute "legacy" statistics */
1875         spin_lock_irqsave(&dev->lock, flags);
1876         nst->rx_packets = (unsigned long)st->rx_packets;
1877         nst->rx_bytes = (unsigned long)st->rx_bytes;
1878         nst->tx_packets = (unsigned long)st->tx_packets;
1879         nst->tx_bytes = (unsigned long)st->tx_bytes;
1880         nst->rx_dropped = (unsigned long)(est->rx_dropped_oom +
1881                                           est->rx_dropped_error +
1882                                           est->rx_dropped_resize +
1883                                           est->rx_dropped_mtu);
1884         nst->tx_dropped = (unsigned long)est->tx_dropped;
1885
1886         nst->rx_errors = (unsigned long)est->rx_bd_errors;
1887         nst->rx_fifo_errors = (unsigned long)(est->rx_bd_overrun +
1888                                               est->rx_fifo_overrun +
1889                                               est->rx_overrun);
1890         nst->rx_frame_errors = (unsigned long)(est->rx_bd_alignment_error +
1891                                                est->rx_alignment_error);
1892         nst->rx_crc_errors = (unsigned long)(est->rx_bd_bad_fcs +
1893                                              est->rx_bad_fcs);
1894         nst->rx_length_errors = (unsigned long)(est->rx_bd_runt_packet +
1895                                                 est->rx_bd_short_event +
1896                                                 est->rx_bd_packet_too_long +
1897                                                 est->rx_bd_out_of_range +
1898                                                 est->rx_bd_in_range +
1899                                                 est->rx_runt_packet +
1900                                                 est->rx_short_event +
1901                                                 est->rx_packet_too_long +
1902                                                 est->rx_out_of_range +
1903                                                 est->rx_in_range);
1904
1905         nst->tx_errors = (unsigned long)(est->tx_bd_errors + est->tx_errors);
1906         nst->tx_fifo_errors = (unsigned long)(est->tx_bd_underrun +
1907                                               est->tx_underrun);
1908         nst->tx_carrier_errors = (unsigned long)est->tx_bd_carrier_loss;
1909         nst->collisions = (unsigned long)(est->tx_bd_excessive_deferral +
1910                                           est->tx_bd_excessive_collisions +
1911                                           est->tx_bd_late_collision +
1912                                           est->tx_bd_multple_collisions);
1913         spin_unlock_irqrestore(&dev->lock, flags);
1914         return nst;
1915 }
1916
1917 static struct mal_commac_ops emac_commac_ops = {
1918         .poll_tx = &emac_poll_tx,
1919         .poll_rx = &emac_poll_rx,
1920         .peek_rx = &emac_peek_rx,
1921         .rxde = &emac_rxde,
1922 };
1923
1924 static struct mal_commac_ops emac_commac_sg_ops = {
1925         .poll_tx = &emac_poll_tx,
1926         .poll_rx = &emac_poll_rx,
1927         .peek_rx = &emac_peek_rx_sg,
1928         .rxde = &emac_rxde,
1929 };
1930
1931 /* Ethtool support */
1932 static int emac_ethtool_get_settings(struct net_device *ndev,
1933                                      struct ethtool_cmd *cmd)
1934 {
1935         struct emac_instance *dev = netdev_priv(ndev);
1936
1937         cmd->supported = dev->phy.features;
1938         cmd->port = PORT_MII;
1939         cmd->phy_address = dev->phy.address;
1940         cmd->transceiver =
1941             dev->phy.address >= 0 ? XCVR_EXTERNAL : XCVR_INTERNAL;
1942
1943         mutex_lock(&dev->link_lock);
1944         cmd->advertising = dev->phy.advertising;
1945         cmd->autoneg = dev->phy.autoneg;
1946         cmd->speed = dev->phy.speed;
1947         cmd->duplex = dev->phy.duplex;
1948         mutex_unlock(&dev->link_lock);
1949
1950         return 0;
1951 }
1952
1953 static int emac_ethtool_set_settings(struct net_device *ndev,
1954                                      struct ethtool_cmd *cmd)
1955 {
1956         struct emac_instance *dev = netdev_priv(ndev);
1957         u32 f = dev->phy.features;
1958
1959         DBG(dev, "set_settings(%d, %d, %d, 0x%08x)" NL,
1960             cmd->autoneg, cmd->speed, cmd->duplex, cmd->advertising);
1961
1962         /* Basic sanity checks */
1963         if (dev->phy.address < 0)
1964                 return -EOPNOTSUPP;
1965         if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
1966                 return -EINVAL;
1967         if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
1968                 return -EINVAL;
1969         if (cmd->duplex != DUPLEX_HALF && cmd->duplex != DUPLEX_FULL)
1970                 return -EINVAL;
1971
1972         if (cmd->autoneg == AUTONEG_DISABLE) {
1973                 switch (cmd->speed) {
1974                 case SPEED_10:
1975                         if (cmd->duplex == DUPLEX_HALF
1976                             && !(f & SUPPORTED_10baseT_Half))
1977                                 return -EINVAL;
1978                         if (cmd->duplex == DUPLEX_FULL
1979                             && !(f & SUPPORTED_10baseT_Full))
1980                                 return -EINVAL;
1981                         break;
1982                 case SPEED_100:
1983                         if (cmd->duplex == DUPLEX_HALF
1984                             && !(f & SUPPORTED_100baseT_Half))
1985                                 return -EINVAL;
1986                         if (cmd->duplex == DUPLEX_FULL
1987                             && !(f & SUPPORTED_100baseT_Full))
1988                                 return -EINVAL;
1989                         break;
1990                 case SPEED_1000:
1991                         if (cmd->duplex == DUPLEX_HALF
1992                             && !(f & SUPPORTED_1000baseT_Half))
1993                                 return -EINVAL;
1994                         if (cmd->duplex == DUPLEX_FULL
1995                             && !(f & SUPPORTED_1000baseT_Full))
1996                                 return -EINVAL;
1997                         break;
1998                 default:
1999                         return -EINVAL;
2000                 }
2001
2002                 mutex_lock(&dev->link_lock);
2003                 dev->phy.def->ops->setup_forced(&dev->phy, cmd->speed,
2004                                                 cmd->duplex);
2005                 mutex_unlock(&dev->link_lock);
2006
2007         } else {
2008                 if (!(f & SUPPORTED_Autoneg))
2009                         return -EINVAL;
2010
2011                 mutex_lock(&dev->link_lock);
2012                 dev->phy.def->ops->setup_aneg(&dev->phy,
2013                                               (cmd->advertising & f) |
2014                                               (dev->phy.advertising &
2015                                                (ADVERTISED_Pause |
2016                                                 ADVERTISED_Asym_Pause)));
2017                 mutex_unlock(&dev->link_lock);
2018         }
2019         emac_force_link_update(dev);
2020
2021         return 0;
2022 }
2023
2024 static void emac_ethtool_get_ringparam(struct net_device *ndev,
2025                                        struct ethtool_ringparam *rp)
2026 {
2027         rp->rx_max_pending = rp->rx_pending = NUM_RX_BUFF;
2028         rp->tx_max_pending = rp->tx_pending = NUM_TX_BUFF;
2029 }
2030
2031 static void emac_ethtool_get_pauseparam(struct net_device *ndev,
2032                                         struct ethtool_pauseparam *pp)
2033 {
2034         struct emac_instance *dev = netdev_priv(ndev);
2035
2036         mutex_lock(&dev->link_lock);
2037         if ((dev->phy.features & SUPPORTED_Autoneg) &&
2038             (dev->phy.advertising & (ADVERTISED_Pause | ADVERTISED_Asym_Pause)))
2039                 pp->autoneg = 1;
2040
2041         if (dev->phy.duplex == DUPLEX_FULL) {
2042                 if (dev->phy.pause)
2043                         pp->rx_pause = pp->tx_pause = 1;
2044                 else if (dev->phy.asym_pause)
2045                         pp->tx_pause = 1;
2046         }
2047         mutex_unlock(&dev->link_lock);
2048 }
2049
2050 static u32 emac_ethtool_get_rx_csum(struct net_device *ndev)
2051 {
2052         struct emac_instance *dev = netdev_priv(ndev);
2053
2054         return dev->tah_dev != NULL;
2055 }
2056
2057 static int emac_get_regs_len(struct emac_instance *dev)
2058 {
2059         if (emac_has_feature(dev, EMAC_FTR_EMAC4))
2060                 return sizeof(struct emac_ethtool_regs_subhdr) +
2061                         EMAC4_ETHTOOL_REGS_SIZE(dev);
2062         else
2063                 return sizeof(struct emac_ethtool_regs_subhdr) +
2064                         EMAC_ETHTOOL_REGS_SIZE(dev);
2065 }
2066
2067 static int emac_ethtool_get_regs_len(struct net_device *ndev)
2068 {
2069         struct emac_instance *dev = netdev_priv(ndev);
2070         int size;
2071
2072         size = sizeof(struct emac_ethtool_regs_hdr) +
2073                 emac_get_regs_len(dev) + mal_get_regs_len(dev->mal);
2074         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
2075                 size += zmii_get_regs_len(dev->zmii_dev);
2076         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
2077                 size += rgmii_get_regs_len(dev->rgmii_dev);
2078         if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
2079                 size += tah_get_regs_len(dev->tah_dev);
2080
2081         return size;
2082 }
2083
2084 static void *emac_dump_regs(struct emac_instance *dev, void *buf)
2085 {
2086         struct emac_ethtool_regs_subhdr *hdr = buf;
2087
2088         hdr->index = dev->cell_index;
2089         if (emac_has_feature(dev, EMAC_FTR_EMAC4)) {
2090                 hdr->version = EMAC4_ETHTOOL_REGS_VER;
2091                 memcpy_fromio(hdr + 1, dev->emacp, EMAC4_ETHTOOL_REGS_SIZE(dev));
2092                 return ((void *)(hdr + 1) + EMAC4_ETHTOOL_REGS_SIZE(dev));
2093         } else {
2094                 hdr->version = EMAC_ETHTOOL_REGS_VER;
2095                 memcpy_fromio(hdr + 1, dev->emacp, EMAC_ETHTOOL_REGS_SIZE(dev));
2096                 return ((void *)(hdr + 1) + EMAC_ETHTOOL_REGS_SIZE(dev));
2097         }
2098 }
2099
2100 static void emac_ethtool_get_regs(struct net_device *ndev,
2101                                   struct ethtool_regs *regs, void *buf)
2102 {
2103         struct emac_instance *dev = netdev_priv(ndev);
2104         struct emac_ethtool_regs_hdr *hdr = buf;
2105
2106         hdr->components = 0;
2107         buf = hdr + 1;
2108
2109         buf = mal_dump_regs(dev->mal, buf);
2110         buf = emac_dump_regs(dev, buf);
2111         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII)) {
2112                 hdr->components |= EMAC_ETHTOOL_REGS_ZMII;
2113                 buf = zmii_dump_regs(dev->zmii_dev, buf);
2114         }
2115         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII)) {
2116                 hdr->components |= EMAC_ETHTOOL_REGS_RGMII;
2117                 buf = rgmii_dump_regs(dev->rgmii_dev, buf);
2118         }
2119         if (emac_has_feature(dev, EMAC_FTR_HAS_TAH)) {
2120                 hdr->components |= EMAC_ETHTOOL_REGS_TAH;
2121                 buf = tah_dump_regs(dev->tah_dev, buf);
2122         }
2123 }
2124
2125 static int emac_ethtool_nway_reset(struct net_device *ndev)
2126 {
2127         struct emac_instance *dev = netdev_priv(ndev);
2128         int res = 0;
2129
2130         DBG(dev, "nway_reset" NL);
2131
2132         if (dev->phy.address < 0)
2133                 return -EOPNOTSUPP;
2134
2135         mutex_lock(&dev->link_lock);
2136         if (!dev->phy.autoneg) {
2137                 res = -EINVAL;
2138                 goto out;
2139         }
2140
2141         dev->phy.def->ops->setup_aneg(&dev->phy, dev->phy.advertising);
2142  out:
2143         mutex_unlock(&dev->link_lock);
2144         emac_force_link_update(dev);
2145         return res;
2146 }
2147
2148 static int emac_ethtool_get_stats_count(struct net_device *ndev)
2149 {
2150         return EMAC_ETHTOOL_STATS_COUNT;
2151 }
2152
2153 static void emac_ethtool_get_strings(struct net_device *ndev, u32 stringset,
2154                                      u8 * buf)
2155 {
2156         if (stringset == ETH_SS_STATS)
2157                 memcpy(buf, &emac_stats_keys, sizeof(emac_stats_keys));
2158 }
2159
2160 static void emac_ethtool_get_ethtool_stats(struct net_device *ndev,
2161                                            struct ethtool_stats *estats,
2162                                            u64 * tmp_stats)
2163 {
2164         struct emac_instance *dev = netdev_priv(ndev);
2165
2166         memcpy(tmp_stats, &dev->stats, sizeof(dev->stats));
2167         tmp_stats += sizeof(dev->stats) / sizeof(u64);
2168         memcpy(tmp_stats, &dev->estats, sizeof(dev->estats));
2169 }
2170
2171 static void emac_ethtool_get_drvinfo(struct net_device *ndev,
2172                                      struct ethtool_drvinfo *info)
2173 {
2174         struct emac_instance *dev = netdev_priv(ndev);
2175
2176         strcpy(info->driver, "ibm_emac");
2177         strcpy(info->version, DRV_VERSION);
2178         info->fw_version[0] = '\0';
2179         sprintf(info->bus_info, "PPC 4xx EMAC-%d %s",
2180                 dev->cell_index, dev->ofdev->node->full_name);
2181         info->n_stats = emac_ethtool_get_stats_count(ndev);
2182         info->regdump_len = emac_ethtool_get_regs_len(ndev);
2183 }
2184
2185 static const struct ethtool_ops emac_ethtool_ops = {
2186         .get_settings = emac_ethtool_get_settings,
2187         .set_settings = emac_ethtool_set_settings,
2188         .get_drvinfo = emac_ethtool_get_drvinfo,
2189
2190         .get_regs_len = emac_ethtool_get_regs_len,
2191         .get_regs = emac_ethtool_get_regs,
2192
2193         .nway_reset = emac_ethtool_nway_reset,
2194
2195         .get_ringparam = emac_ethtool_get_ringparam,
2196         .get_pauseparam = emac_ethtool_get_pauseparam,
2197
2198         .get_rx_csum = emac_ethtool_get_rx_csum,
2199
2200         .get_strings = emac_ethtool_get_strings,
2201         .get_stats_count = emac_ethtool_get_stats_count,
2202         .get_ethtool_stats = emac_ethtool_get_ethtool_stats,
2203
2204         .get_link = ethtool_op_get_link,
2205         .get_tx_csum = ethtool_op_get_tx_csum,
2206         .get_sg = ethtool_op_get_sg,
2207 };
2208
2209 static int emac_ioctl(struct net_device *ndev, struct ifreq *rq, int cmd)
2210 {
2211         struct emac_instance *dev = netdev_priv(ndev);
2212         uint16_t *data = (uint16_t *) & rq->ifr_ifru;
2213
2214         DBG(dev, "ioctl %08x" NL, cmd);
2215
2216         if (dev->phy.address < 0)
2217                 return -EOPNOTSUPP;
2218
2219         switch (cmd) {
2220         case SIOCGMIIPHY:
2221         case SIOCDEVPRIVATE:
2222                 data[0] = dev->phy.address;
2223                 /* Fall through */
2224         case SIOCGMIIREG:
2225         case SIOCDEVPRIVATE + 1:
2226                 data[3] = emac_mdio_read(ndev, dev->phy.address, data[1]);
2227                 return 0;
2228
2229         case SIOCSMIIREG:
2230         case SIOCDEVPRIVATE + 2:
2231                 if (!capable(CAP_NET_ADMIN))
2232                         return -EPERM;
2233                 emac_mdio_write(ndev, dev->phy.address, data[1], data[2]);
2234                 return 0;
2235         default:
2236                 return -EOPNOTSUPP;
2237         }
2238 }
2239
2240 struct emac_depentry {
2241         u32                     phandle;
2242         struct device_node      *node;
2243         struct of_device        *ofdev;
2244         void                    *drvdata;
2245 };
2246
2247 #define EMAC_DEP_MAL_IDX        0
2248 #define EMAC_DEP_ZMII_IDX       1
2249 #define EMAC_DEP_RGMII_IDX      2
2250 #define EMAC_DEP_TAH_IDX        3
2251 #define EMAC_DEP_MDIO_IDX       4
2252 #define EMAC_DEP_PREV_IDX       5
2253 #define EMAC_DEP_COUNT          6
2254
2255 static int __devinit emac_check_deps(struct emac_instance *dev,
2256                                      struct emac_depentry *deps)
2257 {
2258         int i, there = 0;
2259         struct device_node *np;
2260
2261         for (i = 0; i < EMAC_DEP_COUNT; i++) {
2262                 /* no dependency on that item, allright */
2263                 if (deps[i].phandle == 0) {
2264                         there++;
2265                         continue;
2266                 }
2267                 /* special case for blist as the dependency might go away */
2268                 if (i == EMAC_DEP_PREV_IDX) {
2269                         np = *(dev->blist - 1);
2270                         if (np == NULL) {
2271                                 deps[i].phandle = 0;
2272                                 there++;
2273                                 continue;
2274                         }
2275                         if (deps[i].node == NULL)
2276                                 deps[i].node = of_node_get(np);
2277                 }
2278                 if (deps[i].node == NULL)
2279                         deps[i].node = of_find_node_by_phandle(deps[i].phandle);
2280                 if (deps[i].node == NULL)
2281                         continue;
2282                 if (deps[i].ofdev == NULL)
2283                         deps[i].ofdev = of_find_device_by_node(deps[i].node);
2284                 if (deps[i].ofdev == NULL)
2285                         continue;
2286                 if (deps[i].drvdata == NULL)
2287                         deps[i].drvdata = dev_get_drvdata(&deps[i].ofdev->dev);
2288                 if (deps[i].drvdata != NULL)
2289                         there++;
2290         }
2291         return (there == EMAC_DEP_COUNT);
2292 }
2293
2294 static void emac_put_deps(struct emac_instance *dev)
2295 {
2296         if (dev->mal_dev)
2297                 of_dev_put(dev->mal_dev);
2298         if (dev->zmii_dev)
2299                 of_dev_put(dev->zmii_dev);
2300         if (dev->rgmii_dev)
2301                 of_dev_put(dev->rgmii_dev);
2302         if (dev->mdio_dev)
2303                 of_dev_put(dev->mdio_dev);
2304         if (dev->tah_dev)
2305                 of_dev_put(dev->tah_dev);
2306 }
2307
2308 static int __devinit emac_of_bus_notify(struct notifier_block *nb,
2309                                         unsigned long action, void *data)
2310 {
2311         /* We are only intereted in device addition */
2312         if (action == BUS_NOTIFY_BOUND_DRIVER)
2313                 wake_up_all(&emac_probe_wait);
2314         return 0;
2315 }
2316
2317 static struct notifier_block emac_of_bus_notifier __devinitdata = {
2318         .notifier_call = emac_of_bus_notify
2319 };
2320
2321 static int __devinit emac_wait_deps(struct emac_instance *dev)
2322 {
2323         struct emac_depentry deps[EMAC_DEP_COUNT];
2324         int i, err;
2325
2326         memset(&deps, 0, sizeof(deps));
2327
2328         deps[EMAC_DEP_MAL_IDX].phandle = dev->mal_ph;
2329         deps[EMAC_DEP_ZMII_IDX].phandle = dev->zmii_ph;
2330         deps[EMAC_DEP_RGMII_IDX].phandle = dev->rgmii_ph;
2331         if (dev->tah_ph)
2332                 deps[EMAC_DEP_TAH_IDX].phandle = dev->tah_ph;
2333         if (dev->mdio_ph)
2334                 deps[EMAC_DEP_MDIO_IDX].phandle = dev->mdio_ph;
2335         if (dev->blist && dev->blist > emac_boot_list)
2336                 deps[EMAC_DEP_PREV_IDX].phandle = 0xffffffffu;
2337         bus_register_notifier(&of_platform_bus_type, &emac_of_bus_notifier);
2338         wait_event_timeout(emac_probe_wait,
2339                            emac_check_deps(dev, deps),
2340                            EMAC_PROBE_DEP_TIMEOUT);
2341         bus_unregister_notifier(&of_platform_bus_type, &emac_of_bus_notifier);
2342         err = emac_check_deps(dev, deps) ? 0 : -ENODEV;
2343         for (i = 0; i < EMAC_DEP_COUNT; i++) {
2344                 if (deps[i].node)
2345                         of_node_put(deps[i].node);
2346                 if (err && deps[i].ofdev)
2347                         of_dev_put(deps[i].ofdev);
2348         }
2349         if (err == 0) {
2350                 dev->mal_dev = deps[EMAC_DEP_MAL_IDX].ofdev;
2351                 dev->zmii_dev = deps[EMAC_DEP_ZMII_IDX].ofdev;
2352                 dev->rgmii_dev = deps[EMAC_DEP_RGMII_IDX].ofdev;
2353                 dev->tah_dev = deps[EMAC_DEP_TAH_IDX].ofdev;
2354                 dev->mdio_dev = deps[EMAC_DEP_MDIO_IDX].ofdev;
2355         }
2356         if (deps[EMAC_DEP_PREV_IDX].ofdev)
2357                 of_dev_put(deps[EMAC_DEP_PREV_IDX].ofdev);
2358         return err;
2359 }
2360
2361 static int __devinit emac_read_uint_prop(struct device_node *np, const char *name,
2362                                          u32 *val, int fatal)
2363 {
2364         int len;
2365         const u32 *prop = of_get_property(np, name, &len);
2366         if (prop == NULL || len < sizeof(u32)) {
2367                 if (fatal)
2368                         printk(KERN_ERR "%s: missing %s property\n",
2369                                np->full_name, name);
2370                 return -ENODEV;
2371         }
2372         *val = *prop;
2373         return 0;
2374 }
2375
2376 static int __devinit emac_init_phy(struct emac_instance *dev)
2377 {
2378         struct device_node *np = dev->ofdev->node;
2379         struct net_device *ndev = dev->ndev;
2380         u32 phy_map, adv;
2381         int i;
2382
2383         dev->phy.dev = ndev;
2384         dev->phy.mode = dev->phy_mode;
2385
2386         /* PHY-less configuration.
2387          * XXX I probably should move these settings to the dev tree
2388          */
2389         if (dev->phy_address == 0xffffffff && dev->phy_map == 0xffffffff) {
2390                 emac_reset(dev);
2391
2392                 /* PHY-less configuration.
2393                  * XXX I probably should move these settings to the dev tree
2394                  */
2395                 dev->phy.address = -1;
2396                 dev->phy.features = SUPPORTED_MII;
2397                 if (emac_phy_supports_gige(dev->phy_mode))
2398                         dev->phy.features |= SUPPORTED_1000baseT_Full;
2399                 else
2400                         dev->phy.features |= SUPPORTED_100baseT_Full;
2401                 dev->phy.pause = 1;
2402
2403                 return 0;
2404         }
2405
2406         mutex_lock(&emac_phy_map_lock);
2407         phy_map = dev->phy_map | busy_phy_map;
2408
2409         DBG(dev, "PHY maps %08x %08x" NL, dev->phy_map, busy_phy_map);
2410
2411         dev->phy.mdio_read = emac_mdio_read;
2412         dev->phy.mdio_write = emac_mdio_write;
2413
2414         /* Enable internal clock source */
2415 #ifdef CONFIG_PPC_DCR_NATIVE
2416         if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2417                 dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
2418 #endif
2419         /* PHY clock workaround */
2420         emac_rx_clk_tx(dev);
2421
2422         /* Enable internal clock source on 440GX*/
2423 #ifdef CONFIG_PPC_DCR_NATIVE
2424         if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2425                 dcri_clrset(SDR0, SDR0_MFR, 0, SDR0_MFR_ECS);
2426 #endif
2427         /* Configure EMAC with defaults so we can at least use MDIO
2428          * This is needed mostly for 440GX
2429          */
2430         if (emac_phy_gpcs(dev->phy.mode)) {
2431                 /* XXX
2432                  * Make GPCS PHY address equal to EMAC index.
2433                  * We probably should take into account busy_phy_map
2434                  * and/or phy_map here.
2435                  *
2436                  * Note that the busy_phy_map is currently global
2437                  * while it should probably be per-ASIC...
2438                  */
2439                 dev->phy.gpcs_address = dev->gpcs_address;
2440                 if (dev->phy.gpcs_address == 0xffffffff)
2441                         dev->phy.address = dev->cell_index;
2442         }
2443
2444         emac_configure(dev);
2445
2446         if (dev->phy_address != 0xffffffff)
2447                 phy_map = ~(1 << dev->phy_address);
2448
2449         for (i = 0; i < 0x20; phy_map >>= 1, ++i)
2450                 if (!(phy_map & 1)) {
2451                         int r;
2452                         busy_phy_map |= 1 << i;
2453
2454                         /* Quick check if there is a PHY at the address */
2455                         r = emac_mdio_read(dev->ndev, i, MII_BMCR);
2456                         if (r == 0xffff || r < 0)
2457                                 continue;
2458                         if (!emac_mii_phy_probe(&dev->phy, i))
2459                                 break;
2460                 }
2461
2462         /* Enable external clock source */
2463 #ifdef CONFIG_PPC_DCR_NATIVE
2464         if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX))
2465                 dcri_clrset(SDR0, SDR0_MFR, SDR0_MFR_ECS, 0);
2466 #endif
2467         mutex_unlock(&emac_phy_map_lock);
2468         if (i == 0x20) {
2469                 printk(KERN_WARNING "%s: can't find PHY!\n", np->full_name);
2470                 return -ENXIO;
2471         }
2472
2473         /* Init PHY */
2474         if (dev->phy.def->ops->init)
2475                 dev->phy.def->ops->init(&dev->phy);
2476
2477         /* Disable any PHY features not supported by the platform */
2478         dev->phy.def->features &= ~dev->phy_feat_exc;
2479
2480         /* Setup initial link parameters */
2481         if (dev->phy.features & SUPPORTED_Autoneg) {
2482                 adv = dev->phy.features;
2483                 if (!emac_has_feature(dev, EMAC_FTR_NO_FLOW_CONTROL_40x))
2484                         adv |= ADVERTISED_Pause | ADVERTISED_Asym_Pause;
2485                 /* Restart autonegotiation */
2486                 dev->phy.def->ops->setup_aneg(&dev->phy, adv);
2487         } else {
2488                 u32 f = dev->phy.def->features;
2489                 int speed = SPEED_10, fd = DUPLEX_HALF;
2490
2491                 /* Select highest supported speed/duplex */
2492                 if (f & SUPPORTED_1000baseT_Full) {
2493                         speed = SPEED_1000;
2494                         fd = DUPLEX_FULL;
2495                 } else if (f & SUPPORTED_1000baseT_Half)
2496                         speed = SPEED_1000;
2497                 else if (f & SUPPORTED_100baseT_Full) {
2498                         speed = SPEED_100;
2499                         fd = DUPLEX_FULL;
2500                 } else if (f & SUPPORTED_100baseT_Half)
2501                         speed = SPEED_100;
2502                 else if (f & SUPPORTED_10baseT_Full)
2503                         fd = DUPLEX_FULL;
2504
2505                 /* Force link parameters */
2506                 dev->phy.def->ops->setup_forced(&dev->phy, speed, fd);
2507         }
2508         return 0;
2509 }
2510
2511 static int __devinit emac_init_config(struct emac_instance *dev)
2512 {
2513         struct device_node *np = dev->ofdev->node;
2514         const void *p;
2515         unsigned int plen;
2516         const char *pm, *phy_modes[] = {
2517                 [PHY_MODE_NA] = "",
2518                 [PHY_MODE_MII] = "mii",
2519                 [PHY_MODE_RMII] = "rmii",
2520                 [PHY_MODE_SMII] = "smii",
2521                 [PHY_MODE_RGMII] = "rgmii",
2522                 [PHY_MODE_TBI] = "tbi",
2523                 [PHY_MODE_GMII] = "gmii",
2524                 [PHY_MODE_RTBI] = "rtbi",
2525                 [PHY_MODE_SGMII] = "sgmii",
2526         };
2527
2528         /* Read config from device-tree */
2529         if (emac_read_uint_prop(np, "mal-device", &dev->mal_ph, 1))
2530                 return -ENXIO;
2531         if (emac_read_uint_prop(np, "mal-tx-channel", &dev->mal_tx_chan, 1))
2532                 return -ENXIO;
2533         if (emac_read_uint_prop(np, "mal-rx-channel", &dev->mal_rx_chan, 1))
2534                 return -ENXIO;
2535         if (emac_read_uint_prop(np, "cell-index", &dev->cell_index, 1))
2536                 return -ENXIO;
2537         if (emac_read_uint_prop(np, "max-frame-size", &dev->max_mtu, 0))
2538                 dev->max_mtu = 1500;
2539         if (emac_read_uint_prop(np, "rx-fifo-size", &dev->rx_fifo_size, 0))
2540                 dev->rx_fifo_size = 2048;
2541         if (emac_read_uint_prop(np, "tx-fifo-size", &dev->tx_fifo_size, 0))
2542                 dev->tx_fifo_size = 2048;
2543         if (emac_read_uint_prop(np, "rx-fifo-size-gige", &dev->rx_fifo_size_gige, 0))
2544                 dev->rx_fifo_size_gige = dev->rx_fifo_size;
2545         if (emac_read_uint_prop(np, "tx-fifo-size-gige", &dev->tx_fifo_size_gige, 0))
2546                 dev->tx_fifo_size_gige = dev->tx_fifo_size;
2547         if (emac_read_uint_prop(np, "phy-address", &dev->phy_address, 0))
2548                 dev->phy_address = 0xffffffff;
2549         if (emac_read_uint_prop(np, "phy-map", &dev->phy_map, 0))
2550                 dev->phy_map = 0xffffffff;
2551         if (emac_read_uint_prop(np, "gpcs-address", &dev->gpcs_address, 0))
2552                 dev->gpcs_address = 0xffffffff;
2553         if (emac_read_uint_prop(np->parent, "clock-frequency", &dev->opb_bus_freq, 1))
2554                 return -ENXIO;
2555         if (emac_read_uint_prop(np, "tah-device", &dev->tah_ph, 0))
2556                 dev->tah_ph = 0;
2557         if (emac_read_uint_prop(np, "tah-channel", &dev->tah_port, 0))
2558                 dev->tah_port = 0;
2559         if (emac_read_uint_prop(np, "mdio-device", &dev->mdio_ph, 0))
2560                 dev->mdio_ph = 0;
2561         if (emac_read_uint_prop(np, "zmii-device", &dev->zmii_ph, 0))
2562                 dev->zmii_ph = 0;;
2563         if (emac_read_uint_prop(np, "zmii-channel", &dev->zmii_port, 0))
2564                 dev->zmii_port = 0xffffffff;;
2565         if (emac_read_uint_prop(np, "rgmii-device", &dev->rgmii_ph, 0))
2566                 dev->rgmii_ph = 0;;
2567         if (emac_read_uint_prop(np, "rgmii-channel", &dev->rgmii_port, 0))
2568                 dev->rgmii_port = 0xffffffff;;
2569         if (emac_read_uint_prop(np, "fifo-entry-size", &dev->fifo_entry_size, 0))
2570                 dev->fifo_entry_size = 16;
2571         if (emac_read_uint_prop(np, "mal-burst-size", &dev->mal_burst_size, 0))
2572                 dev->mal_burst_size = 256;
2573
2574         /* PHY mode needs some decoding */
2575         dev->phy_mode = PHY_MODE_NA;
2576         pm = of_get_property(np, "phy-mode", &plen);
2577         if (pm != NULL) {
2578                 int i;
2579                 for (i = 0; i < ARRAY_SIZE(phy_modes); i++)
2580                         if (!strcasecmp(pm, phy_modes[i])) {
2581                                 dev->phy_mode = i;
2582                                 break;
2583                         }
2584         }
2585
2586         /* Backward compat with non-final DT */
2587         if (dev->phy_mode == PHY_MODE_NA && pm != NULL && plen == 4) {
2588                 u32 nmode = *(const u32 *)pm;
2589                 if (nmode > PHY_MODE_NA && nmode <= PHY_MODE_SGMII)
2590                         dev->phy_mode = nmode;
2591         }
2592
2593         /* Check EMAC version */
2594         if (of_device_is_compatible(np, "ibm,emac4sync")) {
2595                 dev->features |= (EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC);
2596                 if (of_device_is_compatible(np, "ibm,emac-460ex") ||
2597                     of_device_is_compatible(np, "ibm,emac-460gt"))
2598                         dev->features |= EMAC_FTR_460EX_PHY_CLK_FIX;
2599         } else if (of_device_is_compatible(np, "ibm,emac4")) {
2600                 dev->features |= EMAC_FTR_EMAC4;
2601                 if (of_device_is_compatible(np, "ibm,emac-440gx"))
2602                         dev->features |= EMAC_FTR_440GX_PHY_CLK_FIX;
2603         } else {
2604                 if (of_device_is_compatible(np, "ibm,emac-440ep") ||
2605                     of_device_is_compatible(np, "ibm,emac-440gr"))
2606                         dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
2607                 if (of_device_is_compatible(np, "ibm,emac-405ez")) {
2608 #ifdef CONFIG_IBM_NEW_EMAC_NO_FLOW_CONTROL
2609                         dev->features |= EMAC_FTR_NO_FLOW_CONTROL_40x;
2610 #else
2611                         printk(KERN_ERR "%s: Flow control not disabled!\n",
2612                                         np->full_name);
2613                         return -ENXIO;
2614 #endif
2615                 }
2616
2617         }
2618
2619         /* Fixup some feature bits based on the device tree */
2620         if (of_get_property(np, "has-inverted-stacr-oc", NULL))
2621                 dev->features |= EMAC_FTR_STACR_OC_INVERT;
2622         if (of_get_property(np, "has-new-stacr-staopc", NULL))
2623                 dev->features |= EMAC_FTR_HAS_NEW_STACR;
2624
2625         /* CAB lacks the appropriate properties */
2626         if (of_device_is_compatible(np, "ibm,emac-axon"))
2627                 dev->features |= EMAC_FTR_HAS_NEW_STACR |
2628                         EMAC_FTR_STACR_OC_INVERT;
2629
2630         /* Enable TAH/ZMII/RGMII features as found */
2631         if (dev->tah_ph != 0) {
2632 #ifdef CONFIG_IBM_NEW_EMAC_TAH
2633                 dev->features |= EMAC_FTR_HAS_TAH;
2634 #else
2635                 printk(KERN_ERR "%s: TAH support not enabled !\n",
2636                        np->full_name);
2637                 return -ENXIO;
2638 #endif
2639         }
2640
2641         if (dev->zmii_ph != 0) {
2642 #ifdef CONFIG_IBM_NEW_EMAC_ZMII
2643                 dev->features |= EMAC_FTR_HAS_ZMII;
2644 #else
2645                 printk(KERN_ERR "%s: ZMII support not enabled !\n",
2646                        np->full_name);
2647                 return -ENXIO;
2648 #endif
2649         }
2650
2651         if (dev->rgmii_ph != 0) {
2652 #ifdef CONFIG_IBM_NEW_EMAC_RGMII
2653                 dev->features |= EMAC_FTR_HAS_RGMII;
2654 #else
2655                 printk(KERN_ERR "%s: RGMII support not enabled !\n",
2656                        np->full_name);
2657                 return -ENXIO;
2658 #endif
2659         }
2660
2661         /* Read MAC-address */
2662         p = of_get_property(np, "local-mac-address", NULL);
2663         if (p == NULL) {
2664                 printk(KERN_ERR "%s: Can't find local-mac-address property\n",
2665                        np->full_name);
2666                 return -ENXIO;
2667         }
2668         memcpy(dev->ndev->dev_addr, p, 6);
2669
2670         /* IAHT and GAHT filter parameterization */
2671         if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {
2672                 dev->xaht_slots_shift = EMAC4SYNC_XAHT_SLOTS_SHIFT;
2673                 dev->xaht_width_shift = EMAC4SYNC_XAHT_WIDTH_SHIFT;
2674         } else {
2675                 dev->xaht_slots_shift = EMAC4_XAHT_SLOTS_SHIFT;
2676                 dev->xaht_width_shift = EMAC4_XAHT_WIDTH_SHIFT;
2677         }
2678
2679         DBG(dev, "features     : 0x%08x / 0x%08x\n", dev->features, EMAC_FTRS_POSSIBLE);
2680         DBG(dev, "tx_fifo_size : %d (%d gige)\n", dev->tx_fifo_size, dev->tx_fifo_size_gige);
2681         DBG(dev, "rx_fifo_size : %d (%d gige)\n", dev->rx_fifo_size, dev->rx_fifo_size_gige);
2682         DBG(dev, "max_mtu      : %d\n", dev->max_mtu);
2683         DBG(dev, "OPB freq     : %d\n", dev->opb_bus_freq);
2684
2685         return 0;
2686 }
2687
2688 static int __devinit emac_probe(struct of_device *ofdev,
2689                                 const struct of_device_id *match)
2690 {
2691         struct net_device *ndev;
2692         struct emac_instance *dev;
2693         struct device_node *np = ofdev->node;
2694         struct device_node **blist = NULL;
2695         int err, i;
2696
2697         /* Skip unused/unwired EMACS.  We leave the check for an unused
2698          * property here for now, but new flat device trees should set a
2699          * status property to "disabled" instead.
2700          */
2701         if (of_get_property(np, "unused", NULL) || !of_device_is_available(np))
2702                 return -ENODEV;
2703
2704         /* Find ourselves in the bootlist if we are there */
2705         for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
2706                 if (emac_boot_list[i] == np)
2707                         blist = &emac_boot_list[i];
2708
2709         /* Allocate our net_device structure */
2710         err = -ENOMEM;
2711         ndev = alloc_etherdev(sizeof(struct emac_instance));
2712         if (!ndev) {
2713                 printk(KERN_ERR "%s: could not allocate ethernet device!\n",
2714                        np->full_name);
2715                 goto err_gone;
2716         }
2717         dev = netdev_priv(ndev);
2718         dev->ndev = ndev;
2719         dev->ofdev = ofdev;
2720         dev->blist = blist;
2721         SET_NETDEV_DEV(ndev, &ofdev->dev);
2722
2723         /* Initialize some embedded data structures */
2724         mutex_init(&dev->mdio_lock);
2725         mutex_init(&dev->link_lock);
2726         spin_lock_init(&dev->lock);
2727         INIT_WORK(&dev->reset_work, emac_reset_work);
2728
2729         /* Init various config data based on device-tree */
2730         err = emac_init_config(dev);
2731         if (err != 0)
2732                 goto err_free;
2733
2734         /* Get interrupts. EMAC irq is mandatory, WOL irq is optional */
2735         dev->emac_irq = irq_of_parse_and_map(np, 0);
2736         dev->wol_irq = irq_of_parse_and_map(np, 1);
2737         if (dev->emac_irq == NO_IRQ) {
2738                 printk(KERN_ERR "%s: Can't map main interrupt\n", np->full_name);
2739                 goto err_free;
2740         }
2741         ndev->irq = dev->emac_irq;
2742
2743         /* Map EMAC regs */
2744         if (of_address_to_resource(np, 0, &dev->rsrc_regs)) {
2745                 printk(KERN_ERR "%s: Can't get registers address\n",
2746                        np->full_name);
2747                 goto err_irq_unmap;
2748         }
2749         // TODO : request_mem_region
2750         dev->emacp = ioremap(dev->rsrc_regs.start,
2751                              dev->rsrc_regs.end - dev->rsrc_regs.start + 1);
2752         if (dev->emacp == NULL) {
2753                 printk(KERN_ERR "%s: Can't map device registers!\n",
2754                        np->full_name);
2755                 err = -ENOMEM;
2756                 goto err_irq_unmap;
2757         }
2758
2759         /* Wait for dependent devices */
2760         err = emac_wait_deps(dev);
2761         if (err) {
2762                 printk(KERN_ERR
2763                        "%s: Timeout waiting for dependent devices\n",
2764                        np->full_name);
2765                 /*  display more info about what's missing ? */
2766                 goto err_reg_unmap;
2767         }
2768         dev->mal = dev_get_drvdata(&dev->mal_dev->dev);
2769         if (dev->mdio_dev != NULL)
2770                 dev->mdio_instance = dev_get_drvdata(&dev->mdio_dev->dev);
2771
2772         /* Register with MAL */
2773         dev->commac.ops = &emac_commac_ops;
2774         dev->commac.dev = dev;
2775         dev->commac.tx_chan_mask = MAL_CHAN_MASK(dev->mal_tx_chan);
2776         dev->commac.rx_chan_mask = MAL_CHAN_MASK(dev->mal_rx_chan);
2777         err = mal_register_commac(dev->mal, &dev->commac);
2778         if (err) {
2779                 printk(KERN_ERR "%s: failed to register with mal %s!\n",
2780                        np->full_name, dev->mal_dev->node->full_name);
2781                 goto err_rel_deps;
2782         }
2783         dev->rx_skb_size = emac_rx_skb_size(ndev->mtu);
2784         dev->rx_sync_size = emac_rx_sync_size(ndev->mtu);
2785
2786         /* Get pointers to BD rings */
2787         dev->tx_desc =
2788             dev->mal->bd_virt + mal_tx_bd_offset(dev->mal, dev->mal_tx_chan);
2789         dev->rx_desc =
2790             dev->mal->bd_virt + mal_rx_bd_offset(dev->mal, dev->mal_rx_chan);
2791
2792         DBG(dev, "tx_desc %p" NL, dev->tx_desc);
2793         DBG(dev, "rx_desc %p" NL, dev->rx_desc);
2794
2795         /* Clean rings */
2796         memset(dev->tx_desc, 0, NUM_TX_BUFF * sizeof(struct mal_descriptor));
2797         memset(dev->rx_desc, 0, NUM_RX_BUFF * sizeof(struct mal_descriptor));
2798         memset(dev->tx_skb, 0, NUM_TX_BUFF * sizeof(struct sk_buff *));
2799         memset(dev->rx_skb, 0, NUM_RX_BUFF * sizeof(struct sk_buff *));
2800
2801         /* Attach to ZMII, if needed */
2802         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII) &&
2803             (err = zmii_attach(dev->zmii_dev, dev->zmii_port, &dev->phy_mode)) != 0)
2804                 goto err_unreg_commac;
2805
2806         /* Attach to RGMII, if needed */
2807         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII) &&
2808             (err = rgmii_attach(dev->rgmii_dev, dev->rgmii_port, dev->phy_mode)) != 0)
2809                 goto err_detach_zmii;
2810
2811         /* Attach to TAH, if needed */
2812         if (emac_has_feature(dev, EMAC_FTR_HAS_TAH) &&
2813             (err = tah_attach(dev->tah_dev, dev->tah_port)) != 0)
2814                 goto err_detach_rgmii;
2815
2816         /* Set some link defaults before we can find out real parameters */
2817         dev->phy.speed = SPEED_100;
2818         dev->phy.duplex = DUPLEX_FULL;
2819         dev->phy.autoneg = AUTONEG_DISABLE;
2820         dev->phy.pause = dev->phy.asym_pause = 0;
2821         dev->stop_timeout = STOP_TIMEOUT_100;
2822         INIT_DELAYED_WORK(&dev->link_work, emac_link_timer);
2823
2824         /* Find PHY if any */
2825         err = emac_init_phy(dev);
2826         if (err != 0)
2827                 goto err_detach_tah;
2828
2829         /* Fill in the driver function table */
2830         ndev->open = &emac_open;
2831         if (dev->tah_dev)
2832                 ndev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
2833         ndev->tx_timeout = &emac_tx_timeout;
2834         ndev->watchdog_timeo = 5 * HZ;
2835         ndev->stop = &emac_close;
2836         ndev->get_stats = &emac_stats;
2837         ndev->set_multicast_list = &emac_set_multicast_list;
2838         ndev->do_ioctl = &emac_ioctl;
2839         if (emac_phy_supports_gige(dev->phy_mode)) {
2840                 ndev->hard_start_xmit = &emac_start_xmit_sg;
2841                 ndev->change_mtu = &emac_change_mtu;
2842                 dev->commac.ops = &emac_commac_sg_ops;
2843         } else {
2844                 ndev->hard_start_xmit = &emac_start_xmit;
2845         }
2846         SET_ETHTOOL_OPS(ndev, &emac_ethtool_ops);
2847
2848         netif_carrier_off(ndev);
2849         netif_stop_queue(ndev);
2850
2851         err = register_netdev(ndev);
2852         if (err) {
2853                 printk(KERN_ERR "%s: failed to register net device (%d)!\n",
2854                        np->full_name, err);
2855                 goto err_detach_tah;
2856         }
2857
2858         /* Set our drvdata last as we don't want them visible until we are
2859          * fully initialized
2860          */
2861         wmb();
2862         dev_set_drvdata(&ofdev->dev, dev);
2863
2864         /* There's a new kid in town ! Let's tell everybody */
2865         wake_up_all(&emac_probe_wait);
2866
2867
2868         printk(KERN_INFO
2869                "%s: EMAC-%d %s, MAC %02x:%02x:%02x:%02x:%02x:%02x\n",
2870                ndev->name, dev->cell_index, np->full_name,
2871                ndev->dev_addr[0], ndev->dev_addr[1], ndev->dev_addr[2],
2872                ndev->dev_addr[3], ndev->dev_addr[4], ndev->dev_addr[5]);
2873
2874         if (dev->phy_mode == PHY_MODE_SGMII)
2875                 printk(KERN_NOTICE "%s: in SGMII mode\n", ndev->name);
2876
2877         if (dev->phy.address >= 0)
2878                 printk("%s: found %s PHY (0x%02x)\n", ndev->name,
2879                        dev->phy.def->name, dev->phy.address);
2880
2881         emac_dbg_register(dev);
2882
2883         /* Life is good */
2884         return 0;
2885
2886         /* I have a bad feeling about this ... */
2887
2888  err_detach_tah:
2889         if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
2890                 tah_detach(dev->tah_dev, dev->tah_port);
2891  err_detach_rgmii:
2892         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
2893                 rgmii_detach(dev->rgmii_dev, dev->rgmii_port);
2894  err_detach_zmii:
2895         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
2896                 zmii_detach(dev->zmii_dev, dev->zmii_port);
2897  err_unreg_commac:
2898         mal_unregister_commac(dev->mal, &dev->commac);
2899  err_rel_deps:
2900         emac_put_deps(dev);
2901  err_reg_unmap:
2902         iounmap(dev->emacp);
2903  err_irq_unmap:
2904         if (dev->wol_irq != NO_IRQ)
2905                 irq_dispose_mapping(dev->wol_irq);
2906         if (dev->emac_irq != NO_IRQ)
2907                 irq_dispose_mapping(dev->emac_irq);
2908  err_free:
2909         kfree(ndev);
2910  err_gone:
2911         /* if we were on the bootlist, remove us as we won't show up and
2912          * wake up all waiters to notify them in case they were waiting
2913          * on us
2914          */
2915         if (blist) {
2916                 *blist = NULL;
2917                 wake_up_all(&emac_probe_wait);
2918         }
2919         return err;
2920 }
2921
2922 static int __devexit emac_remove(struct of_device *ofdev)
2923 {
2924         struct emac_instance *dev = dev_get_drvdata(&ofdev->dev);
2925
2926         DBG(dev, "remove" NL);
2927
2928         dev_set_drvdata(&ofdev->dev, NULL);
2929
2930         unregister_netdev(dev->ndev);
2931
2932         flush_scheduled_work();
2933
2934         if (emac_has_feature(dev, EMAC_FTR_HAS_TAH))
2935                 tah_detach(dev->tah_dev, dev->tah_port);
2936         if (emac_has_feature(dev, EMAC_FTR_HAS_RGMII))
2937                 rgmii_detach(dev->rgmii_dev, dev->rgmii_port);
2938         if (emac_has_feature(dev, EMAC_FTR_HAS_ZMII))
2939                 zmii_detach(dev->zmii_dev, dev->zmii_port);
2940
2941         mal_unregister_commac(dev->mal, &dev->commac);
2942         emac_put_deps(dev);
2943
2944         emac_dbg_unregister(dev);
2945         iounmap(dev->emacp);
2946
2947         if (dev->wol_irq != NO_IRQ)
2948                 irq_dispose_mapping(dev->wol_irq);
2949         if (dev->emac_irq != NO_IRQ)
2950                 irq_dispose_mapping(dev->emac_irq);
2951
2952         kfree(dev->ndev);
2953
2954         return 0;
2955 }
2956
2957 /* XXX Features in here should be replaced by properties... */
2958 static struct of_device_id emac_match[] =
2959 {
2960         {
2961                 .type           = "network",
2962                 .compatible     = "ibm,emac",
2963         },
2964         {
2965                 .type           = "network",
2966                 .compatible     = "ibm,emac4",
2967         },
2968         {
2969                 .type           = "network",
2970                 .compatible     = "ibm,emac4sync",
2971         },
2972         {},
2973 };
2974
2975 static struct of_platform_driver emac_driver = {
2976         .name = "emac",
2977         .match_table = emac_match,
2978
2979         .probe = emac_probe,
2980         .remove = emac_remove,
2981 };
2982
2983 static void __init emac_make_bootlist(void)
2984 {
2985         struct device_node *np = NULL;
2986         int j, max, i = 0, k;
2987         int cell_indices[EMAC_BOOT_LIST_SIZE];
2988
2989         /* Collect EMACs */
2990         while((np = of_find_all_nodes(np)) != NULL) {
2991                 const u32 *idx;
2992
2993                 if (of_match_node(emac_match, np) == NULL)
2994                         continue;
2995                 if (of_get_property(np, "unused", NULL))
2996                         continue;
2997                 idx = of_get_property(np, "cell-index", NULL);
2998                 if (idx == NULL)
2999                         continue;
3000                 cell_indices[i] = *idx;
3001                 emac_boot_list[i++] = of_node_get(np);
3002                 if (i >= EMAC_BOOT_LIST_SIZE) {
3003                         of_node_put(np);
3004                         break;
3005                 }
3006         }
3007         max = i;
3008
3009         /* Bubble sort them (doh, what a creative algorithm :-) */
3010         for (i = 0; max > 1 && (i < (max - 1)); i++)
3011                 for (j = i; j < max; j++) {
3012                         if (cell_indices[i] > cell_indices[j]) {
3013                                 np = emac_boot_list[i];
3014                                 emac_boot_list[i] = emac_boot_list[j];
3015                                 emac_boot_list[j] = np;
3016                                 k = cell_indices[i];
3017                                 cell_indices[i] = cell_indices[j];
3018                                 cell_indices[j] = k;
3019                         }
3020                 }
3021 }
3022
3023 static int __init emac_init(void)
3024 {
3025         int rc;
3026
3027         printk(KERN_INFO DRV_DESC ", version " DRV_VERSION "\n");
3028
3029         /* Init debug stuff */
3030         emac_init_debug();
3031
3032         /* Build EMAC boot list */
3033         emac_make_bootlist();
3034
3035         /* Init submodules */
3036         rc = mal_init();
3037         if (rc)
3038                 goto err;
3039         rc = zmii_init();
3040         if (rc)
3041                 goto err_mal;
3042         rc = rgmii_init();
3043         if (rc)
3044                 goto err_zmii;
3045         rc = tah_init();
3046         if (rc)
3047                 goto err_rgmii;
3048         rc = of_register_platform_driver(&emac_driver);
3049         if (rc)
3050                 goto err_tah;
3051
3052         return 0;
3053
3054  err_tah:
3055         tah_exit();
3056  err_rgmii:
3057         rgmii_exit();
3058  err_zmii:
3059         zmii_exit();
3060  err_mal:
3061         mal_exit();
3062  err:
3063         return rc;
3064 }
3065
3066 static void __exit emac_exit(void)
3067 {
3068         int i;
3069
3070         of_unregister_platform_driver(&emac_driver);
3071
3072         tah_exit();
3073         rgmii_exit();
3074         zmii_exit();
3075         mal_exit();
3076         emac_fini_debug();
3077
3078         /* Destroy EMAC boot list */
3079         for (i = 0; i < EMAC_BOOT_LIST_SIZE; i++)
3080                 if (emac_boot_list[i])
3081                         of_node_put(emac_boot_list[i]);
3082 }
3083
3084 module_init(emac_init);
3085 module_exit(emac_exit);