drivers/net/ethernet/broadcom/bcmsysport.c

   1 /*
   2  * Broadcom BCM7xxx System Port Ethernet MAC driver
   3  *
   4  * Copyright (C) 2014 Broadcom Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/of.h>
  21 #include <linux/of_net.h>
  22 #include <linux/of_mdio.h>
  23 #include <linux/phy.h>
  24 #include <linux/phy_fixed.h>
  25 #include <net/ip.h>
  26 #include <net/ipv6.h>
  27
  28 #include "bcmsysport.h"
  29
  30 /* I/O accessors register helpers */
  31 #define BCM_SYSPORT_IO_MACRO(name, offset) \
  32 static inline u32 name##_readl(struct bcm_sysport_priv *priv, u32 off)  \
  33 {                                                                       \
  34         u32 reg = __raw_readl(priv->base + offset + off);               \
  35         return reg;                                                     \
  36 }                                                                       \
  37 static inline void name##_writel(struct bcm_sysport_priv *priv,         \
  38                                   u32 val, u32 off)                     \
  39 {                                                                       \
  40         __raw_writel(val, priv->base + offset + off);                   \
  41 }                                                                       \
  42
  43 BCM_SYSPORT_IO_MACRO(intrl2_0, SYS_PORT_INTRL2_0_OFFSET);
  44 BCM_SYSPORT_IO_MACRO(intrl2_1, SYS_PORT_INTRL2_1_OFFSET);
  45 BCM_SYSPORT_IO_MACRO(umac, SYS_PORT_UMAC_OFFSET);
  46 BCM_SYSPORT_IO_MACRO(tdma, SYS_PORT_TDMA_OFFSET);
  47 BCM_SYSPORT_IO_MACRO(rdma, SYS_PORT_RDMA_OFFSET);
  48 BCM_SYSPORT_IO_MACRO(rxchk, SYS_PORT_RXCHK_OFFSET);
  49 BCM_SYSPORT_IO_MACRO(txchk, SYS_PORT_TXCHK_OFFSET);
  50 BCM_SYSPORT_IO_MACRO(rbuf, SYS_PORT_RBUF_OFFSET);
  51 BCM_SYSPORT_IO_MACRO(tbuf, SYS_PORT_TBUF_OFFSET);
  52 BCM_SYSPORT_IO_MACRO(topctrl, SYS_PORT_TOPCTRL_OFFSET);
  53
  54 /* L2-interrupt masking/unmasking helpers, does automatic saving of the applied
  55  * mask in a software copy to avoid CPU_MASK_STATUS reads in hot-paths.
  56   */
  57 #define BCM_SYSPORT_INTR_L2(which)      \
  58 static inline void intrl2_##which##_mask_clear(struct bcm_sysport_priv *priv, \
  59                                                 u32 mask)               \
  60 {                                                                       \
  61         intrl2_##which##_writel(priv, mask, INTRL2_CPU_MASK_CLEAR);     \
  62         priv->irq##which##_mask &= ~(mask);                             \
  63 }                                                                       \
  64 static inline void intrl2_##which##_mask_set(struct bcm_sysport_priv *priv, \
  65                                                 u32 mask)               \
  66 {                                                                       \
  67         intrl2_## which##_writel(priv, mask, INTRL2_CPU_MASK_SET);      \
  68         priv->irq##which##_mask |= (mask);                              \
  69 }                                                                       \
  70
  71 BCM_SYSPORT_INTR_L2(0)
  72 BCM_SYSPORT_INTR_L2(1)
  73
  74 /* Register accesses to GISB/RBUS registers are expensive (few hundred
  75  * nanoseconds), so keep the check for 64-bits explicit here to save
  76  * one register write per-packet on 32-bits platforms.
  77  */
  78 static inline void dma_desc_set_addr(struct bcm_sysport_priv *priv,
  79                                      void __iomem *d,
  80                                      dma_addr_t addr)
  81 {
  82 #ifdef CONFIG_PHYS_ADDR_T_64BIT
  83         __raw_writel(upper_32_bits(addr) & DESC_ADDR_HI_MASK,
  84                      d + DESC_ADDR_HI_STATUS_LEN);
  85 #endif
  86         __raw_writel(lower_32_bits(addr), d + DESC_ADDR_LO);
  87 }
  88
  89 static inline void tdma_port_write_desc_addr(struct bcm_sysport_priv *priv,
  90                                              struct dma_desc *desc,
  91                                              unsigned int port)
  92 {
  93         /* Ports are latched, so write upper address first */
  94         tdma_writel(priv, desc->addr_status_len, TDMA_WRITE_PORT_HI(port));
  95         tdma_writel(priv, desc->addr_lo, TDMA_WRITE_PORT_LO(port));
  96 }
  97
  98 /* Ethtool operations */
  99 static int bcm_sysport_set_settings(struct net_device *dev,
 100                                     struct ethtool_cmd *cmd)
 101 {
 102         struct bcm_sysport_priv *priv = netdev_priv(dev);
 103
 104         if (!netif_running(dev))
 105                 return -EINVAL;
 106
 107         return phy_ethtool_sset(priv->phydev, cmd);
 108 }
 109
 110 static int bcm_sysport_get_settings(struct net_device *dev,
 111                                     struct ethtool_cmd *cmd)
 112 {
 113         struct bcm_sysport_priv *priv = netdev_priv(dev);
 114
 115         if (!netif_running(dev))
 116                 return -EINVAL;
 117
 118         return phy_ethtool_gset(priv->phydev, cmd);
 119 }
 120
 121 static int bcm_sysport_set_rx_csum(struct net_device *dev,
 122                                    netdev_features_t wanted)
 123 {
 124         struct bcm_sysport_priv *priv = netdev_priv(dev);
 125         u32 reg;
 126
 127         priv->rx_chk_en = !!(wanted & NETIF_F_RXCSUM);
 128         reg = rxchk_readl(priv, RXCHK_CONTROL);
 129         if (priv->rx_chk_en)
 130                 reg |= RXCHK_EN;
 131         else
 132                 reg &= ~RXCHK_EN;
 133
 134         /* If UniMAC forwards CRC, we need to skip over it to get
 135          * a valid CHK bit to be set in the per-packet status word
 136          */
 137         if (priv->rx_chk_en && priv->crc_fwd)
 138                 reg |= RXCHK_SKIP_FCS;
 139         else
 140                 reg &= ~RXCHK_SKIP_FCS;
 141
 142         /* If Broadcom tags are enabled (e.g: using a switch), make
 143          * sure we tell the RXCHK hardware to expect a 4-bytes Broadcom
 144          * tag after the Ethernet MAC Source Address.
 145          */
 146         if (netdev_uses_dsa(dev))
 147                 reg |= RXCHK_BRCM_TAG_EN;
 148         else
 149                 reg &= ~RXCHK_BRCM_TAG_EN;
 150
 151         rxchk_writel(priv, reg, RXCHK_CONTROL);
 152
 153         return 0;
 154 }
 155
 156 static int bcm_sysport_set_tx_csum(struct net_device *dev,
 157                                    netdev_features_t wanted)
 158 {
 159         struct bcm_sysport_priv *priv = netdev_priv(dev);
 160         u32 reg;
 161
 162         /* Hardware transmit checksum requires us to enable the Transmit status
 163          * block prepended to the packet contents
 164          */
 165         priv->tsb_en = !!(wanted & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM));
 166         reg = tdma_readl(priv, TDMA_CONTROL);
 167         if (priv->tsb_en)
 168                 reg |= TSB_EN;
 169         else
 170                 reg &= ~TSB_EN;
 171         tdma_writel(priv, reg, TDMA_CONTROL);
 172
 173         return 0;
 174 }
 175
 176 static int bcm_sysport_set_features(struct net_device *dev,
 177                                     netdev_features_t features)
 178 {
 179         netdev_features_t changed = features ^ dev->features;
 180         netdev_features_t wanted = dev->wanted_features;
 181         int ret = 0;
 182
 183         if (changed & NETIF_F_RXCSUM)
 184                 ret = bcm_sysport_set_rx_csum(dev, wanted);
 185         if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
 186                 ret = bcm_sysport_set_tx_csum(dev, wanted);
 187
 188         return ret;
 189 }
 190
 191 /* Hardware counters must be kept in sync because the order/offset
 192  * is important here (order in structure declaration = order in hardware)
 193  */
 194 static const struct bcm_sysport_stats bcm_sysport_gstrings_stats[] = {
 195         /* general stats */
 196         STAT_NETDEV(rx_packets),
 197         STAT_NETDEV(tx_packets),
 198         STAT_NETDEV(rx_bytes),
 199         STAT_NETDEV(tx_bytes),
 200         STAT_NETDEV(rx_errors),
 201         STAT_NETDEV(tx_errors),
 202         STAT_NETDEV(rx_dropped),
 203         STAT_NETDEV(tx_dropped),
 204         STAT_NETDEV(multicast),
 205         /* UniMAC RSV counters */
 206         STAT_MIB_RX("rx_64_octets", mib.rx.pkt_cnt.cnt_64),
 207         STAT_MIB_RX("rx_65_127_oct", mib.rx.pkt_cnt.cnt_127),
 208         STAT_MIB_RX("rx_128_255_oct", mib.rx.pkt_cnt.cnt_255),
 209         STAT_MIB_RX("rx_256_511_oct", mib.rx.pkt_cnt.cnt_511),
 210         STAT_MIB_RX("rx_512_1023_oct", mib.rx.pkt_cnt.cnt_1023),
 211         STAT_MIB_RX("rx_1024_1518_oct", mib.rx.pkt_cnt.cnt_1518),
 212         STAT_MIB_RX("rx_vlan_1519_1522_oct", mib.rx.pkt_cnt.cnt_mgv),
 213         STAT_MIB_RX("rx_1522_2047_oct", mib.rx.pkt_cnt.cnt_2047),
 214         STAT_MIB_RX("rx_2048_4095_oct", mib.rx.pkt_cnt.cnt_4095),
 215         STAT_MIB_RX("rx_4096_9216_oct", mib.rx.pkt_cnt.cnt_9216),
 216         STAT_MIB_RX("rx_pkts", mib.rx.pkt),
 217         STAT_MIB_RX("rx_bytes", mib.rx.bytes),
 218         STAT_MIB_RX("rx_multicast", mib.rx.mca),
 219         STAT_MIB_RX("rx_broadcast", mib.rx.bca),
 220         STAT_MIB_RX("rx_fcs", mib.rx.fcs),
 221         STAT_MIB_RX("rx_control", mib.rx.cf),
 222         STAT_MIB_RX("rx_pause", mib.rx.pf),
 223         STAT_MIB_RX("rx_unknown", mib.rx.uo),
 224         STAT_MIB_RX("rx_align", mib.rx.aln),
 225         STAT_MIB_RX("rx_outrange", mib.rx.flr),
 226         STAT_MIB_RX("rx_code", mib.rx.cde),
 227         STAT_MIB_RX("rx_carrier", mib.rx.fcr),
 228         STAT_MIB_RX("rx_oversize", mib.rx.ovr),
 229         STAT_MIB_RX("rx_jabber", mib.rx.jbr),
 230         STAT_MIB_RX("rx_mtu_err", mib.rx.mtue),
 231         STAT_MIB_RX("rx_good_pkts", mib.rx.pok),
 232         STAT_MIB_RX("rx_unicast", mib.rx.uc),
 233         STAT_MIB_RX("rx_ppp", mib.rx.ppp),
 234         STAT_MIB_RX("rx_crc", mib.rx.rcrc),
 235         /* UniMAC TSV counters */
 236         STAT_MIB_TX("tx_64_octets", mib.tx.pkt_cnt.cnt_64),
 237         STAT_MIB_TX("tx_65_127_oct", mib.tx.pkt_cnt.cnt_127),
 238         STAT_MIB_TX("tx_128_255_oct", mib.tx.pkt_cnt.cnt_255),
 239         STAT_MIB_TX("tx_256_511_oct", mib.tx.pkt_cnt.cnt_511),
 240         STAT_MIB_TX("tx_512_1023_oct", mib.tx.pkt_cnt.cnt_1023),
 241         STAT_MIB_TX("tx_1024_1518_oct", mib.tx.pkt_cnt.cnt_1518),
 242         STAT_MIB_TX("tx_vlan_1519_1522_oct", mib.tx.pkt_cnt.cnt_mgv),
 243         STAT_MIB_TX("tx_1522_2047_oct", mib.tx.pkt_cnt.cnt_2047),
 244         STAT_MIB_TX("tx_2048_4095_oct", mib.tx.pkt_cnt.cnt_4095),
 245         STAT_MIB_TX("tx_4096_9216_oct", mib.tx.pkt_cnt.cnt_9216),
 246         STAT_MIB_TX("tx_pkts", mib.tx.pkts),
 247         STAT_MIB_TX("tx_multicast", mib.tx.mca),
 248         STAT_MIB_TX("tx_broadcast", mib.tx.bca),
 249         STAT_MIB_TX("tx_pause", mib.tx.pf),
 250         STAT_MIB_TX("tx_control", mib.tx.cf),
 251         STAT_MIB_TX("tx_fcs_err", mib.tx.fcs),
 252         STAT_MIB_TX("tx_oversize", mib.tx.ovr),
 253         STAT_MIB_TX("tx_defer", mib.tx.drf),
 254         STAT_MIB_TX("tx_excess_defer", mib.tx.edf),
 255         STAT_MIB_TX("tx_single_col", mib.tx.scl),
 256         STAT_MIB_TX("tx_multi_col", mib.tx.mcl),
 257         STAT_MIB_TX("tx_late_col", mib.tx.lcl),
 258         STAT_MIB_TX("tx_excess_col", mib.tx.ecl),
 259         STAT_MIB_TX("tx_frags", mib.tx.frg),
 260         STAT_MIB_TX("tx_total_col", mib.tx.ncl),
 261         STAT_MIB_TX("tx_jabber", mib.tx.jbr),
 262         STAT_MIB_TX("tx_bytes", mib.tx.bytes),
 263         STAT_MIB_TX("tx_good_pkts", mib.tx.pok),
 264         STAT_MIB_TX("tx_unicast", mib.tx.uc),
 265         /* UniMAC RUNT counters */
 266         STAT_RUNT("rx_runt_pkts", mib.rx_runt_cnt),
 267         STAT_RUNT("rx_runt_valid_fcs", mib.rx_runt_fcs),
 268         STAT_RUNT("rx_runt_inval_fcs_align", mib.rx_runt_fcs_align),
 269         STAT_RUNT("rx_runt_bytes", mib.rx_runt_bytes),
 270         /* RXCHK misc statistics */
 271         STAT_RXCHK("rxchk_bad_csum", mib.rxchk_bad_csum, RXCHK_BAD_CSUM_CNTR),
 272         STAT_RXCHK("rxchk_other_pkt_disc", mib.rxchk_other_pkt_disc,
 273                    RXCHK_OTHER_DISC_CNTR),
 274         /* RBUF misc statistics */
 275         STAT_RBUF("rbuf_ovflow_cnt", mib.rbuf_ovflow_cnt, RBUF_OVFL_DISC_CNTR),
 276         STAT_RBUF("rbuf_err_cnt", mib.rbuf_err_cnt, RBUF_ERR_PKT_CNTR),
 277 };
 278
 279 #define BCM_SYSPORT_STATS_LEN   ARRAY_SIZE(bcm_sysport_gstrings_stats)
 280
 281 static void bcm_sysport_get_drvinfo(struct net_device *dev,
 282                                     struct ethtool_drvinfo *info)
 283 {
 284         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 285         strlcpy(info->version, "0.1", sizeof(info->version));
 286         strlcpy(info->bus_info, "platform", sizeof(info->bus_info));
 287         info->n_stats = BCM_SYSPORT_STATS_LEN;
 288 }
 289
 290 static u32 bcm_sysport_get_msglvl(struct net_device *dev)
 291 {
 292         struct bcm_sysport_priv *priv = netdev_priv(dev);
 293
 294         return priv->msg_enable;
 295 }
 296
 297 static void bcm_sysport_set_msglvl(struct net_device *dev, u32 enable)
 298 {
 299         struct bcm_sysport_priv *priv = netdev_priv(dev);
 300
 301         priv->msg_enable = enable;
 302 }
 303
 304 static int bcm_sysport_get_sset_count(struct net_device *dev, int string_set)
 305 {
 306         switch (string_set) {
 307         case ETH_SS_STATS:
 308                 return BCM_SYSPORT_STATS_LEN;
 309         default:
 310                 return -EOPNOTSUPP;
 311         }
 312 }
 313
 314 static void bcm_sysport_get_strings(struct net_device *dev,
 315                                     u32 stringset, u8 *data)
 316 {
 317         int i;
 318
 319         switch (stringset) {
 320         case ETH_SS_STATS:
 321                 for (i = 0; i < BCM_SYSPORT_STATS_LEN; i++) {
 322                         memcpy(data + i * ETH_GSTRING_LEN,
 323                                bcm_sysport_gstrings_stats[i].stat_string,
 324                                ETH_GSTRING_LEN);
 325                 }
 326                 break;
 327         default:
 328                 break;
 329         }
 330 }
 331
 332 static void bcm_sysport_update_mib_counters(struct bcm_sysport_priv *priv)
 333 {
 334         int i, j = 0;
 335
 336         for (i = 0; i < BCM_SYSPORT_STATS_LEN; i++) {
 337                 const struct bcm_sysport_stats *s;
 338                 u8 offset = 0;
 339                 u32 val = 0;
 340                 char *p;
 341
 342                 s = &bcm_sysport_gstrings_stats[i];
 343                 switch (s->type) {
 344                 case BCM_SYSPORT_STAT_NETDEV:
 345                         continue;
 346                 case BCM_SYSPORT_STAT_MIB_RX:
 347                 case BCM_SYSPORT_STAT_MIB_TX:
 348                 case BCM_SYSPORT_STAT_RUNT:
 349                         if (s->type != BCM_SYSPORT_STAT_MIB_RX)
 350                                 offset = UMAC_MIB_STAT_OFFSET;
 351                         val = umac_readl(priv, UMAC_MIB_START + j + offset);
 352                         break;
 353                 case BCM_SYSPORT_STAT_RXCHK:
 354                         val = rxchk_readl(priv, s->reg_offset);
 355                         if (val == ~0)
 356                                 rxchk_writel(priv, 0, s->reg_offset);
 357                         break;
 358                 case BCM_SYSPORT_STAT_RBUF:
 359                         val = rbuf_readl(priv, s->reg_offset);
 360                         if (val == ~0)
 361                                 rbuf_writel(priv, 0, s->reg_offset);
 362                         break;
 363                 }
 364
 365                 j += s->stat_sizeof;
 366                 p = (char *)priv + s->stat_offset;
 367                 *(u32 *)p = val;
 368         }
 369
 370         netif_dbg(priv, hw, priv->netdev, "updated MIB counters\n");
 371 }
 372
 373 static void bcm_sysport_get_stats(struct net_device *dev,
 374                                   struct ethtool_stats *stats, u64 *data)
 375 {
 376         struct bcm_sysport_priv *priv = netdev_priv(dev);
 377         int i;
 378
 379         if (netif_running(dev))
 380                 bcm_sysport_update_mib_counters(priv);
 381
 382         for (i =  0; i < BCM_SYSPORT_STATS_LEN; i++) {
 383                 const struct bcm_sysport_stats *s;
 384                 char *p;
 385
 386                 s = &bcm_sysport_gstrings_stats[i];
 387                 if (s->type == BCM_SYSPORT_STAT_NETDEV)
 388                         p = (char *)&dev->stats;
 389                 else
 390                         p = (char *)priv;
 391                 p += s->stat_offset;
 392                 data[i] = *(u32 *)p;
 393         }
 394 }
 395
 396 static void bcm_sysport_get_wol(struct net_device *dev,
 397                                 struct ethtool_wolinfo *wol)
 398 {
 399         struct bcm_sysport_priv *priv = netdev_priv(dev);
 400         u32 reg;
 401
 402         wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE;
 403         wol->wolopts = priv->wolopts;
 404
 405         if (!(priv->wolopts & WAKE_MAGICSECURE))
 406                 return;
 407
 408         /* Return the programmed SecureOn password */
 409         reg = umac_readl(priv, UMAC_PSW_MS);
 410         put_unaligned_be16(reg, &wol->sopass[0]);
 411         reg = umac_readl(priv, UMAC_PSW_LS);
 412         put_unaligned_be32(reg, &wol->sopass[2]);
 413 }
 414
 415 static int bcm_sysport_set_wol(struct net_device *dev,
 416                                struct ethtool_wolinfo *wol)
 417 {
 418         struct bcm_sysport_priv *priv = netdev_priv(dev);
 419         struct device *kdev = &priv->pdev->dev;
 420         u32 supported = WAKE_MAGIC | WAKE_MAGICSECURE;
 421
 422         if (!device_can_wakeup(kdev))
 423                 return -ENOTSUPP;
 424
 425         if (wol->wolopts & ~supported)
 426                 return -EINVAL;
 427
 428         /* Program the SecureOn password */
 429         if (wol->wolopts & WAKE_MAGICSECURE) {
 430                 umac_writel(priv, get_unaligned_be16(&wol->sopass[0]),
 431                             UMAC_PSW_MS);
 432                 umac_writel(priv, get_unaligned_be32(&wol->sopass[2]),
 433                             UMAC_PSW_LS);
 434         }
 435
 436         /* Flag the device and relevant IRQ as wakeup capable */
 437         if (wol->wolopts) {
 438                 device_set_wakeup_enable(kdev, 1);
 439                 if (priv->wol_irq_disabled)
 440                         enable_irq_wake(priv->wol_irq);
 441                 priv->wol_irq_disabled = 0;
 442         } else {
 443                 device_set_wakeup_enable(kdev, 0);
 444                 /* Avoid unbalanced disable_irq_wake calls */
 445                 if (!priv->wol_irq_disabled)
 446                         disable_irq_wake(priv->wol_irq);
 447                 priv->wol_irq_disabled = 1;
 448         }
 449
 450         priv->wolopts = wol->wolopts;
 451
 452         return 0;
 453 }
 454
 455 static void bcm_sysport_free_cb(struct bcm_sysport_cb *cb)
 456 {
 457         dev_kfree_skb_any(cb->skb);
 458         cb->skb = NULL;
 459         dma_unmap_addr_set(cb, dma_addr, 0);
 460 }
 461
 462 static int bcm_sysport_rx_refill(struct bcm_sysport_priv *priv,
 463                                  struct bcm_sysport_cb *cb)
 464 {
 465         struct device *kdev = &priv->pdev->dev;
 466         struct net_device *ndev = priv->netdev;
 467         dma_addr_t mapping;
 468         int ret;
 469
 470         cb->skb = netdev_alloc_skb(priv->netdev, RX_BUF_LENGTH);
 471         if (!cb->skb) {
 472                 netif_err(priv, rx_err, ndev, "SKB alloc failed\n");
 473                 return -ENOMEM;
 474         }
 475
 476         mapping = dma_map_single(kdev, cb->skb->data,
 477                                  RX_BUF_LENGTH, DMA_FROM_DEVICE);
 478         ret = dma_mapping_error(kdev, mapping);
 479         if (ret) {
 480                 bcm_sysport_free_cb(cb);
 481                 netif_err(priv, rx_err, ndev, "DMA mapping failure\n");
 482                 return ret;
 483         }
 484
 485         dma_unmap_addr_set(cb, dma_addr, mapping);
 486         dma_desc_set_addr(priv, priv->rx_bd_assign_ptr, mapping);
 487
 488         priv->rx_bd_assign_index++;
 489         priv->rx_bd_assign_index &= (priv->num_rx_bds - 1);
 490         priv->rx_bd_assign_ptr = priv->rx_bds +
 491                 (priv->rx_bd_assign_index * DESC_SIZE);
 492
 493         netif_dbg(priv, rx_status, ndev, "RX refill\n");
 494
 495         return 0;
 496 }
 497
 498 static int bcm_sysport_alloc_rx_bufs(struct bcm_sysport_priv *priv)
 499 {
 500         struct bcm_sysport_cb *cb;
 501         int ret = 0;
 502         unsigned int i;
 503
 504         for (i = 0; i < priv->num_rx_bds; i++) {
 505                 cb = &priv->rx_cbs[priv->rx_bd_assign_index];
 506                 if (cb->skb)
 507                         continue;
 508
 509                 ret = bcm_sysport_rx_refill(priv, cb);
 510                 if (ret)
 511                         break;
 512         }
 513
 514         return ret;
 515 }
 516
 517 /* Poll the hardware for up to budget packets to process */
 518 static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
 519                                         unsigned int budget)
 520 {
 521         struct device *kdev = &priv->pdev->dev;
 522         struct net_device *ndev = priv->netdev;
 523         unsigned int processed = 0, to_process;
 524         struct bcm_sysport_cb *cb;
 525         struct sk_buff *skb;
 526         unsigned int p_index;
 527         u16 len, status;
 528         struct bcm_rsb *rsb;
 529
 530         /* Determine how much we should process since last call */
 531         p_index = rdma_readl(priv, RDMA_PROD_INDEX);
 532         p_index &= RDMA_PROD_INDEX_MASK;
 533
 534         if (p_index < priv->rx_c_index)
 535                 to_process = (RDMA_CONS_INDEX_MASK + 1) -
 536                         priv->rx_c_index + p_index;
 537         else
 538                 to_process = p_index - priv->rx_c_index;
 539
 540         netif_dbg(priv, rx_status, ndev,
 541                   "p_index=%d rx_c_index=%d to_process=%d\n",
 542                   p_index, priv->rx_c_index, to_process);
 543
 544         while ((processed < to_process) && (processed < budget)) {
 545                 cb = &priv->rx_cbs[priv->rx_read_ptr];
 546                 skb = cb->skb;
 547
 548                 processed++;
 549                 priv->rx_read_ptr++;
 550
 551                 if (priv->rx_read_ptr == priv->num_rx_bds)
 552                         priv->rx_read_ptr = 0;
 553
 554                 /* We do not have a backing SKB, so we do not a corresponding
 555                  * DMA mapping for this incoming packet since
 556                  * bcm_sysport_rx_refill always either has both skb and mapping
 557                  * or none.
 558                  */
 559                 if (unlikely(!skb)) {
 560                         netif_err(priv, rx_err, ndev, "out of memory!\n");
 561                         ndev->stats.rx_dropped++;
 562                         ndev->stats.rx_errors++;
 563                         goto refill;
 564                 }
 565
 566                 dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
 567                                  RX_BUF_LENGTH, DMA_FROM_DEVICE);
 568
 569                 /* Extract the Receive Status Block prepended */
 570                 rsb = (struct bcm_rsb *)skb->data;
 571                 len = (rsb->rx_status_len >> DESC_LEN_SHIFT) & DESC_LEN_MASK;
 572                 status = (rsb->rx_status_len >> DESC_STATUS_SHIFT) &
 573                           DESC_STATUS_MASK;
 574
 575                 netif_dbg(priv, rx_status, ndev,
 576                           "p=%d, c=%d, rd_ptr=%d, len=%d, flag=0x%04x\n",
 577                           p_index, priv->rx_c_index, priv->rx_read_ptr,
 578                           len, status);
 579
 580                 if (unlikely(!(status & DESC_EOP) || !(status & DESC_SOP))) {
 581                         netif_err(priv, rx_status, ndev, "fragmented packet!\n");
 582                         ndev->stats.rx_dropped++;
 583                         ndev->stats.rx_errors++;
 584                         bcm_sysport_free_cb(cb);
 585                         goto refill;
 586                 }
 587
 588                 if (unlikely(status & (RX_STATUS_ERR | RX_STATUS_OVFLOW))) {
 589                         netif_err(priv, rx_err, ndev, "error packet\n");
 590                         if (status & RX_STATUS_OVFLOW)
 591                                 ndev->stats.rx_over_errors++;
 592                         ndev->stats.rx_dropped++;
 593                         ndev->stats.rx_errors++;
 594                         bcm_sysport_free_cb(cb);
 595                         goto refill;
 596                 }
 597
 598                 skb_put(skb, len);
 599
 600                 /* Hardware validated our checksum */
 601                 if (likely(status & DESC_L4_CSUM))
 602                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 603
 604                 /* Hardware pre-pends packets with 2bytes before Ethernet
 605                  * header plus we have the Receive Status Block, strip off all
 606                  * of this from the SKB.
 607                  */
 608                 skb_pull(skb, sizeof(*rsb) + 2);
 609                 len -= (sizeof(*rsb) + 2);
 610
 611                 /* UniMAC may forward CRC */
 612                 if (priv->crc_fwd) {
 613                         skb_trim(skb, len - ETH_FCS_LEN);
 614                         len -= ETH_FCS_LEN;
 615                 }
 616
 617                 skb->protocol = eth_type_trans(skb, ndev);
 618                 ndev->stats.rx_packets++;
 619                 ndev->stats.rx_bytes += len;
 620
 621                 napi_gro_receive(&priv->napi, skb);
 622 refill:
 623                 bcm_sysport_rx_refill(priv, cb);
 624         }
 625
 626         return processed;
 627 }
 628
 629 static void bcm_sysport_tx_reclaim_one(struct bcm_sysport_priv *priv,
 630                                        struct bcm_sysport_cb *cb,
 631                                        unsigned int *bytes_compl,
 632                                        unsigned int *pkts_compl)
 633 {
 634         struct device *kdev = &priv->pdev->dev;
 635         struct net_device *ndev = priv->netdev;
 636
 637         if (cb->skb) {
 638                 ndev->stats.tx_bytes += cb->skb->len;
 639                 *bytes_compl += cb->skb->len;
 640                 dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
 641                                  dma_unmap_len(cb, dma_len),
 642                                  DMA_TO_DEVICE);
 643                 ndev->stats.tx_packets++;
 644                 (*pkts_compl)++;
 645                 bcm_sysport_free_cb(cb);
 646         /* SKB fragment */
 647         } else if (dma_unmap_addr(cb, dma_addr)) {
 648                 ndev->stats.tx_bytes += dma_unmap_len(cb, dma_len);
 649                 dma_unmap_page(kdev, dma_unmap_addr(cb, dma_addr),
 650                                dma_unmap_len(cb, dma_len), DMA_TO_DEVICE);
 651                 dma_unmap_addr_set(cb, dma_addr, 0);
 652         }
 653 }
 654
 655 /* Reclaim queued SKBs for transmission completion, lockless version */
 656 static unsigned int __bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
 657                                              struct bcm_sysport_tx_ring *ring)
 658 {
 659         struct net_device *ndev = priv->netdev;
 660         unsigned int c_index, last_c_index, last_tx_cn, num_tx_cbs;
 661         unsigned int pkts_compl = 0, bytes_compl = 0;
 662         struct bcm_sysport_cb *cb;
 663         struct netdev_queue *txq;
 664         u32 hw_ind;
 665
 666         txq = netdev_get_tx_queue(ndev, ring->index);
 667
 668         /* Compute how many descriptors have been processed since last call */
 669         hw_ind = tdma_readl(priv, TDMA_DESC_RING_PROD_CONS_INDEX(ring->index));
 670         c_index = (hw_ind >> RING_CONS_INDEX_SHIFT) & RING_CONS_INDEX_MASK;
 671         ring->p_index = (hw_ind & RING_PROD_INDEX_MASK);
 672
 673         last_c_index = ring->c_index;
 674         num_tx_cbs = ring->size;
 675
 676         c_index &= (num_tx_cbs - 1);
 677
 678         if (c_index >= last_c_index)
 679                 last_tx_cn = c_index - last_c_index;
 680         else
 681                 last_tx_cn = num_tx_cbs - last_c_index + c_index;
 682
 683         netif_dbg(priv, tx_done, ndev,
 684                   "ring=%d c_index=%d last_tx_cn=%d last_c_index=%d\n",
 685                   ring->index, c_index, last_tx_cn, last_c_index);
 686
 687         while (last_tx_cn-- > 0) {
 688                 cb = ring->cbs + last_c_index;
 689                 bcm_sysport_tx_reclaim_one(priv, cb, &bytes_compl, &pkts_compl);
 690
 691                 ring->desc_count++;
 692                 last_c_index++;
 693                 last_c_index &= (num_tx_cbs - 1);
 694         }
 695
 696         ring->c_index = c_index;
 697
 698         if (netif_tx_queue_stopped(txq) && pkts_compl)
 699                 netif_tx_wake_queue(txq);
 700
 701         netif_dbg(priv, tx_done, ndev,
 702                   "ring=%d c_index=%d pkts_compl=%d, bytes_compl=%d\n",
 703                   ring->index, ring->c_index, pkts_compl, bytes_compl);
 704
 705         return pkts_compl;
 706 }
 707
 708 /* Locked version of the per-ring TX reclaim routine */
 709 static unsigned int bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
 710                                            struct bcm_sysport_tx_ring *ring)
 711 {
 712         unsigned int released;
 713         unsigned long flags;
 714
 715         spin_lock_irqsave(&ring->lock, flags);
 716         released = __bcm_sysport_tx_reclaim(priv, ring);
 717         spin_unlock_irqrestore(&ring->lock, flags);
 718
 719         return released;
 720 }
 721
 722 static int bcm_sysport_tx_poll(struct napi_struct *napi, int budget)
 723 {
 724         struct bcm_sysport_tx_ring *ring =
 725                 container_of(napi, struct bcm_sysport_tx_ring, napi);
 726         unsigned int work_done = 0;
 727
 728         work_done = bcm_sysport_tx_reclaim(ring->priv, ring);
 729
 730         if (work_done == 0) {
 731                 napi_complete(napi);
 732                 /* re-enable TX interrupt */
 733                 intrl2_1_mask_clear(ring->priv, BIT(ring->index));
 734         }
 735
 736         return 0;
 737 }
 738
 739 static void bcm_sysport_tx_reclaim_all(struct bcm_sysport_priv *priv)
 740 {
 741         unsigned int q;
 742
 743         for (q = 0; q < priv->netdev->num_tx_queues; q++)
 744                 bcm_sysport_tx_reclaim(priv, &priv->tx_rings[q]);
 745 }
 746
 747 static int bcm_sysport_poll(struct napi_struct *napi, int budget)
 748 {
 749         struct bcm_sysport_priv *priv =
 750                 container_of(napi, struct bcm_sysport_priv, napi);
 751         unsigned int work_done = 0;
 752
 753         work_done = bcm_sysport_desc_rx(priv, budget);
 754
 755         priv->rx_c_index += work_done;
 756         priv->rx_c_index &= RDMA_CONS_INDEX_MASK;
 757         rdma_writel(priv, priv->rx_c_index, RDMA_CONS_INDEX);
 758
 759         if (work_done < budget) {
 760                 napi_complete(napi);
 761                 /* re-enable RX interrupts */
 762                 intrl2_0_mask_clear(priv, INTRL2_0_RDMA_MBDONE);
 763         }
 764
 765         return work_done;
 766 }
 767
 768 static void bcm_sysport_resume_from_wol(struct bcm_sysport_priv *priv)
 769 {
 770         u32 reg;
 771
 772         /* Stop monitoring MPD interrupt */
 773         intrl2_0_mask_set(priv, INTRL2_0_MPD);
 774
 775         /* Clear the MagicPacket detection logic */
 776         reg = umac_readl(priv, UMAC_MPD_CTRL);
 777         reg &= ~MPD_EN;
 778         umac_writel(priv, reg, UMAC_MPD_CTRL);
 779
 780         netif_dbg(priv, wol, priv->netdev, "resumed from WOL\n");
 781 }
 782
 783 /* RX and misc interrupt routine */
 784 static irqreturn_t bcm_sysport_rx_isr(int irq, void *dev_id)
 785 {
 786         struct net_device *dev = dev_id;
 787         struct bcm_sysport_priv *priv = netdev_priv(dev);
 788
 789         priv->irq0_stat = intrl2_0_readl(priv, INTRL2_CPU_STATUS) &
 790                           ~intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
 791         intrl2_0_writel(priv, priv->irq0_stat, INTRL2_CPU_CLEAR);
 792
 793         if (unlikely(priv->irq0_stat == 0)) {
 794                 netdev_warn(priv->netdev, "spurious RX interrupt\n");
 795                 return IRQ_NONE;
 796         }
 797
 798         if (priv->irq0_stat & INTRL2_0_RDMA_MBDONE) {
 799                 if (likely(napi_schedule_prep(&priv->napi))) {
 800                         /* disable RX interrupts */
 801                         intrl2_0_mask_set(priv, INTRL2_0_RDMA_MBDONE);
 802                         __napi_schedule(&priv->napi);
 803                 }
 804         }
 805
 806         /* TX ring is full, perform a full reclaim since we do not know
 807          * which one would trigger this interrupt
 808          */
 809         if (priv->irq0_stat & INTRL2_0_TX_RING_FULL)
 810                 bcm_sysport_tx_reclaim_all(priv);
 811
 812         if (priv->irq0_stat & INTRL2_0_MPD) {
 813                 netdev_info(priv->netdev, "Wake-on-LAN interrupt!\n");
 814                 bcm_sysport_resume_from_wol(priv);
 815         }
 816
 817         return IRQ_HANDLED;
 818 }
 819
 820 /* TX interrupt service routine */
 821 static irqreturn_t bcm_sysport_tx_isr(int irq, void *dev_id)
 822 {
 823         struct net_device *dev = dev_id;
 824         struct bcm_sysport_priv *priv = netdev_priv(dev);
 825         struct bcm_sysport_tx_ring *txr;
 826         unsigned int ring;
 827
 828         priv->irq1_stat = intrl2_1_readl(priv, INTRL2_CPU_STATUS) &
 829                                 ~intrl2_1_readl(priv, INTRL2_CPU_MASK_STATUS);
 830         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
 831
 832         if (unlikely(priv->irq1_stat == 0)) {
 833                 netdev_warn(priv->netdev, "spurious TX interrupt\n");
 834                 return IRQ_NONE;
 835         }
 836
 837         for (ring = 0; ring < dev->num_tx_queues; ring++) {
 838                 if (!(priv->irq1_stat & BIT(ring)))
 839                         continue;
 840
 841                 txr = &priv->tx_rings[ring];
 842
 843                 if (likely(napi_schedule_prep(&txr->napi))) {
 844                         intrl2_1_mask_set(priv, BIT(ring));
 845                         __napi_schedule(&txr->napi);
 846                 }
 847         }
 848
 849         return IRQ_HANDLED;
 850 }
 851
 852 static irqreturn_t bcm_sysport_wol_isr(int irq, void *dev_id)
 853 {
 854         struct bcm_sysport_priv *priv = dev_id;
 855
 856         pm_wakeup_event(&priv->pdev->dev, 0);
 857
 858         return IRQ_HANDLED;
 859 }
 860
 861 static struct sk_buff *bcm_sysport_insert_tsb(struct sk_buff *skb,
 862                                               struct net_device *dev)
 863 {
 864         struct sk_buff *nskb;
 865         struct bcm_tsb *tsb;
 866         u32 csum_info;
 867         u8 ip_proto;
 868         u16 csum_start;
 869         u16 ip_ver;
 870
 871         /* Re-allocate SKB if needed */
 872         if (unlikely(skb_headroom(skb) < sizeof(*tsb))) {
 873                 nskb = skb_realloc_headroom(skb, sizeof(*tsb));
 874                 dev_kfree_skb(skb);
 875                 if (!nskb) {
 876                         dev->stats.tx_errors++;
 877                         dev->stats.tx_dropped++;
 878                         return NULL;
 879                 }
 880                 skb = nskb;
 881         }
 882
 883         tsb = (struct bcm_tsb *)skb_push(skb, sizeof(*tsb));
 884         /* Zero-out TSB by default */
 885         memset(tsb, 0, sizeof(*tsb));
 886
 887         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 888                 ip_ver = htons(skb->protocol);
 889                 switch (ip_ver) {
 890                 case ETH_P_IP:
 891                         ip_proto = ip_hdr(skb)->protocol;
 892                         break;
 893                 case ETH_P_IPV6:
 894                         ip_proto = ipv6_hdr(skb)->nexthdr;
 895                         break;
 896                 default:
 897                         return skb;
 898                 }
 899
 900                 /* Get the checksum offset and the L4 (transport) offset */
 901                 csum_start = skb_checksum_start_offset(skb) - sizeof(*tsb);
 902                 csum_info = (csum_start + skb->csum_offset) & L4_CSUM_PTR_MASK;
 903                 csum_info |= (csum_start << L4_PTR_SHIFT);
 904
 905                 if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
 906                         csum_info |= L4_LENGTH_VALID;
 907                         if (ip_proto == IPPROTO_UDP && ip_ver == ETH_P_IP)
 908                                 csum_info |= L4_UDP;
 909                 } else {
 910                         csum_info = 0;
 911                 }
 912
 913                 tsb->l4_ptr_dest_map = csum_info;
 914         }
 915
 916         return skb;
 917 }
 918
 919 static netdev_tx_t bcm_sysport_xmit(struct sk_buff *skb,
 920                                     struct net_device *dev)
 921 {
 922         struct bcm_sysport_priv *priv = netdev_priv(dev);
 923         struct device *kdev = &priv->pdev->dev;
 924         struct bcm_sysport_tx_ring *ring;
 925         struct bcm_sysport_cb *cb;
 926         struct netdev_queue *txq;
 927         struct dma_desc *desc;
 928         unsigned int skb_len;
 929         unsigned long flags;
 930         dma_addr_t mapping;
 931         u32 len_status;
 932         u16 queue;
 933         int ret;
 934
 935         queue = skb_get_queue_mapping(skb);
 936         txq = netdev_get_tx_queue(dev, queue);
 937         ring = &priv->tx_rings[queue];
 938
 939         /* lock against tx reclaim in BH context and TX ring full interrupt */
 940         spin_lock_irqsave(&ring->lock, flags);
 941         if (unlikely(ring->desc_count == 0)) {
 942                 netif_tx_stop_queue(txq);
 943                 netdev_err(dev, "queue %d awake and ring full!\n", queue);
 944                 ret = NETDEV_TX_BUSY;
 945                 goto out;
 946         }
 947
 948         /* Insert TSB and checksum infos */
 949         if (priv->tsb_en) {
 950                 skb = bcm_sysport_insert_tsb(skb, dev);
 951                 if (!skb) {
 952                         ret = NETDEV_TX_OK;
 953                         goto out;
 954                 }
 955         }
 956
 957         /* The Ethernet switch we are interfaced with needs packets to be at
 958          * least 64 bytes (including FCS) otherwise they will be discarded when
 959          * they enter the switch port logic. When Broadcom tags are enabled, we
 960          * need to make sure that packets are at least 68 bytes
 961          * (including FCS and tag) because the length verification is done after
 962          * the Broadcom tag is stripped off the ingress packet.
 963          */
 964         if (skb_padto(skb, ETH_ZLEN + ENET_BRCM_TAG_LEN)) {
 965                 ret = NETDEV_TX_OK;
 966                 goto out;
 967         }
 968
 969         skb_len = skb->len < ETH_ZLEN + ENET_BRCM_TAG_LEN ?
 970                         ETH_ZLEN + ENET_BRCM_TAG_LEN : skb->len;
 971
 972         mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
 973         if (dma_mapping_error(kdev, mapping)) {
 974                 netif_err(priv, tx_err, dev, "DMA map failed at %p (len=%d)\n",
 975                           skb->data, skb_len);
 976                 ret = NETDEV_TX_OK;
 977                 goto out;
 978         }
 979
 980         /* Remember the SKB for future freeing */
 981         cb = &ring->cbs[ring->curr_desc];
 982         cb->skb = skb;
 983         dma_unmap_addr_set(cb, dma_addr, mapping);
 984         dma_unmap_len_set(cb, dma_len, skb_len);
 985
 986         /* Fetch a descriptor entry from our pool */
 987         desc = ring->desc_cpu;
 988
 989         desc->addr_lo = lower_32_bits(mapping);
 990         len_status = upper_32_bits(mapping) & DESC_ADDR_HI_MASK;
 991         len_status |= (skb_len << DESC_LEN_SHIFT);
 992         len_status |= (DESC_SOP | DESC_EOP | TX_STATUS_APP_CRC) <<
 993                        DESC_STATUS_SHIFT;
 994         if (skb->ip_summed == CHECKSUM_PARTIAL)
 995                 len_status |= (DESC_L4_CSUM << DESC_STATUS_SHIFT);
 996
 997         ring->curr_desc++;
 998         if (ring->curr_desc == ring->size)
 999                 ring->curr_desc = 0;
1000         ring->desc_count--;
1001
1002         /* Ensure write completion of the descriptor status/length
1003          * in DRAM before the System Port WRITE_PORT register latches
1004          * the value
1005          */
1006         wmb();
1007         desc->addr_status_len = len_status;
1008         wmb();
1009
1010         /* Write this descriptor address to the RING write port */
1011         tdma_port_write_desc_addr(priv, desc, ring->index);
1012
1013         /* Check ring space and update SW control flow */
1014         if (ring->desc_count == 0)
1015                 netif_tx_stop_queue(txq);
1016
1017         netif_dbg(priv, tx_queued, dev, "ring=%d desc_count=%d, curr_desc=%d\n",
1018                   ring->index, ring->desc_count, ring->curr_desc);
1019
1020         ret = NETDEV_TX_OK;
1021 out:
1022         spin_unlock_irqrestore(&ring->lock, flags);
1023         return ret;
1024 }
1025
1026 static void bcm_sysport_tx_timeout(struct net_device *dev)
1027 {
1028         netdev_warn(dev, "transmit timeout!\n");
1029
1030         dev->trans_start = jiffies;
1031         dev->stats.tx_errors++;
1032
1033         netif_tx_wake_all_queues(dev);
1034 }
1035
1036 /* phylib adjust link callback */
1037 static void bcm_sysport_adj_link(struct net_device *dev)
1038 {
1039         struct bcm_sysport_priv *priv = netdev_priv(dev);
1040         struct phy_device *phydev = priv->phydev;
1041         unsigned int changed = 0;
1042         u32 cmd_bits = 0, reg;
1043
1044         if (priv->old_link != phydev->link) {
1045                 changed = 1;
1046                 priv->old_link = phydev->link;
1047         }
1048
1049         if (priv->old_duplex != phydev->duplex) {
1050                 changed = 1;
1051                 priv->old_duplex = phydev->duplex;
1052         }
1053
1054         switch (phydev->speed) {
1055         case SPEED_2500:
1056                 cmd_bits = CMD_SPEED_2500;
1057                 break;
1058         case SPEED_1000:
1059                 cmd_bits = CMD_SPEED_1000;
1060                 break;
1061         case SPEED_100:
1062                 cmd_bits = CMD_SPEED_100;
1063                 break;
1064         case SPEED_10:
1065                 cmd_bits = CMD_SPEED_10;
1066                 break;
1067         default:
1068                 break;
1069         }
1070         cmd_bits <<= CMD_SPEED_SHIFT;
1071
1072         if (phydev->duplex == DUPLEX_HALF)
1073                 cmd_bits |= CMD_HD_EN;
1074
1075         if (priv->old_pause != phydev->pause) {
1076                 changed = 1;
1077                 priv->old_pause = phydev->pause;
1078         }
1079
1080         if (!phydev->pause)
1081                 cmd_bits |= CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE;
1082
1083         if (!changed)
1084                 return;
1085
1086         if (phydev->link) {
1087                 reg = umac_readl(priv, UMAC_CMD);
1088                 reg &= ~((CMD_SPEED_MASK << CMD_SPEED_SHIFT) |
1089                         CMD_HD_EN | CMD_RX_PAUSE_IGNORE |
1090                         CMD_TX_PAUSE_IGNORE);
1091                 reg |= cmd_bits;
1092                 umac_writel(priv, reg, UMAC_CMD);
1093         }
1094
1095         phy_print_status(priv->phydev);
1096 }
1097
1098 static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,
1099                                     unsigned int index)
1100 {
1101         struct bcm_sysport_tx_ring *ring = &priv->tx_rings[index];
1102         struct device *kdev = &priv->pdev->dev;
1103         size_t size;
1104         void *p;
1105         u32 reg;
1106
1107         /* Simple descriptors partitioning for now */
1108         size = 256;
1109
1110         /* We just need one DMA descriptor which is DMA-able, since writing to
1111          * the port will allocate a new descriptor in its internal linked-list
1112          */
1113         p = dma_zalloc_coherent(kdev, 1, &ring->desc_dma, GFP_KERNEL);
1114         if (!p) {
1115                 netif_err(priv, hw, priv->netdev, "DMA alloc failed\n");
1116                 return -ENOMEM;
1117         }
1118
1119         ring->cbs = kcalloc(size, sizeof(struct bcm_sysport_cb), GFP_KERNEL);
1120         if (!ring->cbs) {
1121                 netif_err(priv, hw, priv->netdev, "CB allocation failed\n");
1122                 return -ENOMEM;
1123         }
1124
1125         /* Initialize SW view of the ring */
1126         spin_lock_init(&ring->lock);
1127         ring->priv = priv;
1128         netif_napi_add(priv->netdev, &ring->napi, bcm_sysport_tx_poll, 64);
1129         ring->index = index;
1130         ring->size = size;
1131         ring->alloc_size = ring->size;
1132         ring->desc_cpu = p;
1133         ring->desc_count = ring->size;
1134         ring->curr_desc = 0;
1135
1136         /* Initialize HW ring */
1137         tdma_writel(priv, RING_EN, TDMA_DESC_RING_HEAD_TAIL_PTR(index));
1138         tdma_writel(priv, 0, TDMA_DESC_RING_COUNT(index));
1139         tdma_writel(priv, 1, TDMA_DESC_RING_INTR_CONTROL(index));
1140         tdma_writel(priv, 0, TDMA_DESC_RING_PROD_CONS_INDEX(index));
1141         tdma_writel(priv, RING_IGNORE_STATUS, TDMA_DESC_RING_MAPPING(index));
1142         tdma_writel(priv, 0, TDMA_DESC_RING_PCP_DEI_VID(index));
1143
1144         /* Program the number of descriptors as MAX_THRESHOLD and half of
1145          * its size for the hysteresis trigger
1146          */
1147         tdma_writel(priv, ring->size |
1148                         1 << RING_HYST_THRESH_SHIFT,
1149                         TDMA_DESC_RING_MAX_HYST(index));
1150
1151         /* Enable the ring queue in the arbiter */
1152         reg = tdma_readl(priv, TDMA_TIER1_ARB_0_QUEUE_EN);
1153         reg |= (1 << index);
1154         tdma_writel(priv, reg, TDMA_TIER1_ARB_0_QUEUE_EN);
1155
1156         napi_enable(&ring->napi);
1157
1158         netif_dbg(priv, hw, priv->netdev,
1159                   "TDMA cfg, size=%d, desc_cpu=%p\n",
1160                   ring->size, ring->desc_cpu);
1161
1162         return 0;
1163 }
1164
1165 static void bcm_sysport_fini_tx_ring(struct bcm_sysport_priv *priv,
1166                                      unsigned int index)
1167 {
1168         struct bcm_sysport_tx_ring *ring = &priv->tx_rings[index];
1169         struct device *kdev = &priv->pdev->dev;
1170         u32 reg;
1171
1172         /* Caller should stop the TDMA engine */
1173         reg = tdma_readl(priv, TDMA_STATUS);
1174         if (!(reg & TDMA_DISABLED))
1175                 netdev_warn(priv->netdev, "TDMA not stopped!\n");
1176
1177         napi_disable(&ring->napi);
1178         netif_napi_del(&ring->napi);
1179
1180         bcm_sysport_tx_reclaim(priv, ring);
1181
1182         kfree(ring->cbs);
1183         ring->cbs = NULL;
1184
1185         if (ring->desc_dma) {
1186                 dma_free_coherent(kdev, 1, ring->desc_cpu, ring->desc_dma);
1187                 ring->desc_dma = 0;
1188         }
1189         ring->size = 0;
1190         ring->alloc_size = 0;
1191
1192         netif_dbg(priv, hw, priv->netdev, "TDMA fini done\n");
1193 }
1194
1195 /* RDMA helper */
1196 static inline int rdma_enable_set(struct bcm_sysport_priv *priv,
1197                                   unsigned int enable)
1198 {
1199         unsigned int timeout = 1000;
1200         u32 reg;
1201
1202         reg = rdma_readl(priv, RDMA_CONTROL);
1203         if (enable)
1204                 reg |= RDMA_EN;
1205         else
1206                 reg &= ~RDMA_EN;
1207         rdma_writel(priv, reg, RDMA_CONTROL);
1208
1209         /* Poll for RMDA disabling completion */
1210         do {
1211                 reg = rdma_readl(priv, RDMA_STATUS);
1212                 if (!!(reg & RDMA_DISABLED) == !enable)
1213                         return 0;
1214                 usleep_range(1000, 2000);
1215         } while (timeout-- > 0);
1216
1217         netdev_err(priv->netdev, "timeout waiting for RDMA to finish\n");
1218
1219         return -ETIMEDOUT;
1220 }
1221
1222 /* TDMA helper */
1223 static inline int tdma_enable_set(struct bcm_sysport_priv *priv,
1224                                   unsigned int enable)
1225 {
1226         unsigned int timeout = 1000;
1227         u32 reg;
1228
1229         reg = tdma_readl(priv, TDMA_CONTROL);
1230         if (enable)
1231                 reg |= TDMA_EN;
1232         else
1233                 reg &= ~TDMA_EN;
1234         tdma_writel(priv, reg, TDMA_CONTROL);
1235
1236         /* Poll for TMDA disabling completion */
1237         do {
1238                 reg = tdma_readl(priv, TDMA_STATUS);
1239                 if (!!(reg & TDMA_DISABLED) == !enable)
1240                         return 0;
1241
1242                 usleep_range(1000, 2000);
1243         } while (timeout-- > 0);
1244
1245         netdev_err(priv->netdev, "timeout waiting for TDMA to finish\n");
1246
1247         return -ETIMEDOUT;
1248 }
1249
1250 static int bcm_sysport_init_rx_ring(struct bcm_sysport_priv *priv)
1251 {
1252         u32 reg;
1253         int ret;
1254
1255         /* Initialize SW view of the RX ring */
1256         priv->num_rx_bds = NUM_RX_DESC;
1257         priv->rx_bds = priv->base + SYS_PORT_RDMA_OFFSET;
1258         priv->rx_bd_assign_ptr = priv->rx_bds;
1259         priv->rx_bd_assign_index = 0;
1260         priv->rx_c_index = 0;
1261         priv->rx_read_ptr = 0;
1262         priv->rx_cbs = kcalloc(priv->num_rx_bds, sizeof(struct bcm_sysport_cb),
1263                                 GFP_KERNEL);
1264         if (!priv->rx_cbs) {
1265                 netif_err(priv, hw, priv->netdev, "CB allocation failed\n");
1266                 return -ENOMEM;
1267         }
1268
1269         ret = bcm_sysport_alloc_rx_bufs(priv);
1270         if (ret) {
1271                 netif_err(priv, hw, priv->netdev, "SKB allocation failed\n");
1272                 return ret;
1273         }
1274
1275         /* Initialize HW, ensure RDMA is disabled */
1276         reg = rdma_readl(priv, RDMA_STATUS);
1277         if (!(reg & RDMA_DISABLED))
1278                 rdma_enable_set(priv, 0);
1279
1280         rdma_writel(priv, 0, RDMA_WRITE_PTR_LO);
1281         rdma_writel(priv, 0, RDMA_WRITE_PTR_HI);
1282         rdma_writel(priv, 0, RDMA_PROD_INDEX);
1283         rdma_writel(priv, 0, RDMA_CONS_INDEX);
1284         rdma_writel(priv, priv->num_rx_bds << RDMA_RING_SIZE_SHIFT |
1285                           RX_BUF_LENGTH, RDMA_RING_BUF_SIZE);
1286         /* Operate the queue in ring mode */
1287         rdma_writel(priv, 0, RDMA_START_ADDR_HI);
1288         rdma_writel(priv, 0, RDMA_START_ADDR_LO);
1289         rdma_writel(priv, 0, RDMA_END_ADDR_HI);
1290         rdma_writel(priv, NUM_HW_RX_DESC_WORDS - 1, RDMA_END_ADDR_LO);
1291
1292         rdma_writel(priv, 1, RDMA_MBDONE_INTR);
1293
1294         netif_dbg(priv, hw, priv->netdev,
1295                   "RDMA cfg, num_rx_bds=%d, rx_bds=%p\n",
1296                   priv->num_rx_bds, priv->rx_bds);
1297
1298         return 0;
1299 }
1300
1301 static void bcm_sysport_fini_rx_ring(struct bcm_sysport_priv *priv)
1302 {
1303         struct bcm_sysport_cb *cb;
1304         unsigned int i;
1305         u32 reg;
1306
1307         /* Caller should ensure RDMA is disabled */
1308         reg = rdma_readl(priv, RDMA_STATUS);
1309         if (!(reg & RDMA_DISABLED))
1310                 netdev_warn(priv->netdev, "RDMA not stopped!\n");
1311
1312         for (i = 0; i < priv->num_rx_bds; i++) {
1313                 cb = &priv->rx_cbs[i];
1314                 if (dma_unmap_addr(cb, dma_addr))
1315                         dma_unmap_single(&priv->pdev->dev,
1316                                          dma_unmap_addr(cb, dma_addr),
1317                                          RX_BUF_LENGTH, DMA_FROM_DEVICE);
1318                 bcm_sysport_free_cb(cb);
1319         }
1320
1321         kfree(priv->rx_cbs);
1322         priv->rx_cbs = NULL;
1323
1324         netif_dbg(priv, hw, priv->netdev, "RDMA fini done\n");
1325 }
1326
1327 static void bcm_sysport_set_rx_mode(struct net_device *dev)
1328 {
1329         struct bcm_sysport_priv *priv = netdev_priv(dev);
1330         u32 reg;
1331
1332         reg = umac_readl(priv, UMAC_CMD);
1333         if (dev->flags & IFF_PROMISC)
1334                 reg |= CMD_PROMISC;
1335         else
1336                 reg &= ~CMD_PROMISC;
1337         umac_writel(priv, reg, UMAC_CMD);
1338
1339         /* No support for ALLMULTI */
1340         if (dev->flags & IFF_ALLMULTI)
1341                 return;
1342 }
1343
1344 static inline void umac_enable_set(struct bcm_sysport_priv *priv,
1345                                    u32 mask, unsigned int enable)
1346 {
1347         u32 reg;
1348
1349         reg = umac_readl(priv, UMAC_CMD);
1350         if (enable)
1351                 reg |= mask;
1352         else
1353                 reg &= ~mask;
1354         umac_writel(priv, reg, UMAC_CMD);
1355
1356         /* UniMAC stops on a packet boundary, wait for a full-sized packet
1357          * to be processed (1 msec).
1358          */
1359         if (enable == 0)
1360                 usleep_range(1000, 2000);
1361 }
1362
1363 static inline void umac_reset(struct bcm_sysport_priv *priv)
1364 {
1365         u32 reg;
1366
1367         reg = umac_readl(priv, UMAC_CMD);
1368         reg |= CMD_SW_RESET;
1369         umac_writel(priv, reg, UMAC_CMD);
1370         udelay(10);
1371         reg = umac_readl(priv, UMAC_CMD);
1372         reg &= ~CMD_SW_RESET;
1373         umac_writel(priv, reg, UMAC_CMD);
1374 }
1375
1376 static void umac_set_hw_addr(struct bcm_sysport_priv *priv,
1377                              unsigned char *addr)
1378 {
1379         umac_writel(priv, (addr[0] << 24) | (addr[1] << 16) |
1380                         (addr[2] << 8) | addr[3], UMAC_MAC0);
1381         umac_writel(priv, (addr[4] << 8) | addr[5], UMAC_MAC1);
1382 }
1383
1384 static void topctrl_flush(struct bcm_sysport_priv *priv)
1385 {
1386         topctrl_writel(priv, RX_FLUSH, RX_FLUSH_CNTL);
1387         topctrl_writel(priv, TX_FLUSH, TX_FLUSH_CNTL);
1388         mdelay(1);
1389         topctrl_writel(priv, 0, RX_FLUSH_CNTL);
1390         topctrl_writel(priv, 0, TX_FLUSH_CNTL);
1391 }
1392
1393 static void bcm_sysport_netif_start(struct net_device *dev)
1394 {
1395         struct bcm_sysport_priv *priv = netdev_priv(dev);
1396
1397         /* Enable NAPI */
1398         napi_enable(&priv->napi);
1399
1400         phy_start(priv->phydev);
1401
1402         /* Enable TX interrupts for the 32 TXQs */
1403         intrl2_1_mask_clear(priv, 0xffffffff);
1404
1405         /* Last call before we start the real business */
1406         netif_tx_start_all_queues(dev);
1407 }
1408
1409 static void rbuf_init(struct bcm_sysport_priv *priv)
1410 {
1411         u32 reg;
1412
1413         reg = rbuf_readl(priv, RBUF_CONTROL);
1414         reg |= RBUF_4B_ALGN | RBUF_RSB_EN;
1415         rbuf_writel(priv, reg, RBUF_CONTROL);
1416 }
1417
1418 static int bcm_sysport_open(struct net_device *dev)
1419 {
1420         struct bcm_sysport_priv *priv = netdev_priv(dev);
1421         unsigned int i;
1422         int ret;
1423
1424         /* Reset UniMAC */
1425         umac_reset(priv);
1426
1427         /* Flush TX and RX FIFOs at TOPCTRL level */
1428         topctrl_flush(priv);
1429
1430         /* Disable the UniMAC RX/TX */
1431         umac_enable_set(priv, CMD_RX_EN | CMD_TX_EN, 0);
1432
1433         /* Enable RBUF 2bytes alignment and Receive Status Block */
1434         rbuf_init(priv);
1435
1436         /* Set maximum frame length */
1437         umac_writel(priv, UMAC_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
1438
1439         /* Set MAC address */
1440         umac_set_hw_addr(priv, dev->dev_addr);
1441
1442         /* Read CRC forward */
1443         priv->crc_fwd = !!(umac_readl(priv, UMAC_CMD) & CMD_CRC_FWD);
1444
1445         priv->phydev = of_phy_connect(dev, priv->phy_dn, bcm_sysport_adj_link,
1446                                         0, priv->phy_interface);
1447         if (!priv->phydev) {
1448                 netdev_err(dev, "could not attach to PHY\n");
1449                 return -ENODEV;
1450         }
1451
1452         /* Reset house keeping link status */
1453         priv->old_duplex = -1;
1454         priv->old_link = -1;
1455         priv->old_pause = -1;
1456
1457         /* mask all interrupts and request them */
1458         intrl2_0_writel(priv, 0xffffffff, INTRL2_CPU_MASK_SET);
1459         intrl2_0_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1460         intrl2_0_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1461         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_MASK_SET);
1462         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1463         intrl2_1_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1464
1465         ret = request_irq(priv->irq0, bcm_sysport_rx_isr, 0, dev->name, dev);
1466         if (ret) {
1467                 netdev_err(dev, "failed to request RX interrupt\n");
1468                 goto out_phy_disconnect;
1469         }
1470
1471         ret = request_irq(priv->irq1, bcm_sysport_tx_isr, 0, dev->name, dev);
1472         if (ret) {
1473                 netdev_err(dev, "failed to request TX interrupt\n");
1474                 goto out_free_irq0;
1475         }
1476
1477         /* Initialize both hardware and software ring */
1478         for (i = 0; i < dev->num_tx_queues; i++) {
1479                 ret = bcm_sysport_init_tx_ring(priv, i);
1480                 if (ret) {
1481                         netdev_err(dev, "failed to initialize TX ring %d\n",
1482                                    i);
1483                         goto out_free_tx_ring;
1484                 }
1485         }
1486
1487         /* Initialize linked-list */
1488         tdma_writel(priv, TDMA_LL_RAM_INIT_BUSY, TDMA_STATUS);
1489
1490         /* Initialize RX ring */
1491         ret = bcm_sysport_init_rx_ring(priv);
1492         if (ret) {
1493                 netdev_err(dev, "failed to initialize RX ring\n");
1494                 goto out_free_rx_ring;
1495         }
1496
1497         /* Turn on RDMA */
1498         ret = rdma_enable_set(priv, 1);
1499         if (ret)
1500                 goto out_free_rx_ring;
1501
1502         /* Enable RX interrupt and TX ring full interrupt */
1503         intrl2_0_mask_clear(priv, INTRL2_0_RDMA_MBDONE | INTRL2_0_TX_RING_FULL);
1504
1505         /* Turn on TDMA */
1506         ret = tdma_enable_set(priv, 1);
1507         if (ret)
1508                 goto out_clear_rx_int;
1509
1510         /* Turn on UniMAC TX/RX */
1511         umac_enable_set(priv, CMD_RX_EN | CMD_TX_EN, 1);
1512
1513         bcm_sysport_netif_start(dev);
1514
1515         return 0;
1516
1517 out_clear_rx_int:
1518         intrl2_0_mask_set(priv, INTRL2_0_RDMA_MBDONE | INTRL2_0_TX_RING_FULL);
1519 out_free_rx_ring:
1520         bcm_sysport_fini_rx_ring(priv);
1521 out_free_tx_ring:
1522         for (i = 0; i < dev->num_tx_queues; i++)
1523                 bcm_sysport_fini_tx_ring(priv, i);
1524         free_irq(priv->irq1, dev);
1525 out_free_irq0:
1526         free_irq(priv->irq0, dev);
1527 out_phy_disconnect:
1528         phy_disconnect(priv->phydev);
1529         return ret;
1530 }
1531
1532 static void bcm_sysport_netif_stop(struct net_device *dev)
1533 {
1534         struct bcm_sysport_priv *priv = netdev_priv(dev);
1535
1536         /* stop all software from updating hardware */
1537         netif_tx_stop_all_queues(dev);
1538         napi_disable(&priv->napi);
1539         phy_stop(priv->phydev);
1540
1541         /* mask all interrupts */
1542         intrl2_0_mask_set(priv, 0xffffffff);
1543         intrl2_0_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1544         intrl2_1_mask_set(priv, 0xffffffff);
1545         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1546 }
1547
1548 static int bcm_sysport_stop(struct net_device *dev)
1549 {
1550         struct bcm_sysport_priv *priv = netdev_priv(dev);
1551         unsigned int i;
1552         int ret;
1553
1554         bcm_sysport_netif_stop(dev);
1555
1556         /* Disable UniMAC RX */
1557         umac_enable_set(priv, CMD_RX_EN, 0);
1558
1559         ret = tdma_enable_set(priv, 0);
1560         if (ret) {
1561                 netdev_err(dev, "timeout disabling RDMA\n");
1562                 return ret;
1563         }
1564
1565         /* Wait for a maximum packet size to be drained */
1566         usleep_range(2000, 3000);
1567
1568         ret = rdma_enable_set(priv, 0);
1569         if (ret) {
1570                 netdev_err(dev, "timeout disabling TDMA\n");
1571                 return ret;
1572         }
1573
1574         /* Disable UniMAC TX */
1575         umac_enable_set(priv, CMD_TX_EN, 0);
1576
1577         /* Free RX/TX rings SW structures */
1578         for (i = 0; i < dev->num_tx_queues; i++)
1579                 bcm_sysport_fini_tx_ring(priv, i);
1580         bcm_sysport_fini_rx_ring(priv);
1581
1582         free_irq(priv->irq0, dev);
1583         free_irq(priv->irq1, dev);
1584
1585         /* Disconnect from PHY */
1586         phy_disconnect(priv->phydev);
1587
1588         return 0;
1589 }
1590
1591 static struct ethtool_ops bcm_sysport_ethtool_ops = {
1592         .get_settings           = bcm_sysport_get_settings,
1593         .set_settings           = bcm_sysport_set_settings,
1594         .get_drvinfo            = bcm_sysport_get_drvinfo,
1595         .get_msglevel           = bcm_sysport_get_msglvl,
1596         .set_msglevel           = bcm_sysport_set_msglvl,
1597         .get_link               = ethtool_op_get_link,
1598         .get_strings            = bcm_sysport_get_strings,
1599         .get_ethtool_stats      = bcm_sysport_get_stats,
1600         .get_sset_count         = bcm_sysport_get_sset_count,
1601         .get_wol                = bcm_sysport_get_wol,
1602         .set_wol                = bcm_sysport_set_wol,
1603 };
1604
1605 static const struct net_device_ops bcm_sysport_netdev_ops = {
1606         .ndo_start_xmit         = bcm_sysport_xmit,
1607         .ndo_tx_timeout         = bcm_sysport_tx_timeout,
1608         .ndo_open               = bcm_sysport_open,
1609         .ndo_stop               = bcm_sysport_stop,
1610         .ndo_set_features       = bcm_sysport_set_features,
1611         .ndo_set_rx_mode        = bcm_sysport_set_rx_mode,
1612 };
1613
1614 #define REV_FMT "v%2x.%02x"
1615
1616 static int bcm_sysport_probe(struct platform_device *pdev)
1617 {
1618         struct bcm_sysport_priv *priv;
1619         struct device_node *dn;
1620         struct net_device *dev;
1621         const void *macaddr;
1622         struct resource *r;
1623         u32 txq, rxq;
1624         int ret;
1625
1626         dn = pdev->dev.of_node;
1627         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1628
1629         /* Read the Transmit/Receive Queue properties */
1630         if (of_property_read_u32(dn, "systemport,num-txq", &txq))
1631                 txq = TDMA_NUM_RINGS;
1632         if (of_property_read_u32(dn, "systemport,num-rxq", &rxq))
1633                 rxq = 1;
1634
1635         dev = alloc_etherdev_mqs(sizeof(*priv), txq, rxq);
1636         if (!dev)
1637                 return -ENOMEM;
1638
1639         /* Initialize private members */
1640         priv = netdev_priv(dev);
1641
1642         priv->irq0 = platform_get_irq(pdev, 0);
1643         priv->irq1 = platform_get_irq(pdev, 1);
1644         priv->wol_irq = platform_get_irq(pdev, 2);
1645         if (priv->irq0 <= 0 || priv->irq1 <= 0) {
1646                 dev_err(&pdev->dev, "invalid interrupts\n");
1647                 ret = -EINVAL;
1648                 goto err;
1649         }
1650
1651         priv->base = devm_ioremap_resource(&pdev->dev, r);
1652         if (IS_ERR(priv->base)) {
1653                 ret = PTR_ERR(priv->base);
1654                 goto err;
1655         }
1656
1657         priv->netdev = dev;
1658         priv->pdev = pdev;
1659
1660         priv->phy_interface = of_get_phy_mode(dn);
1661         /* Default to GMII interface mode */
1662         if (priv->phy_interface < 0)
1663                 priv->phy_interface = PHY_INTERFACE_MODE_GMII;
1664
1665         /* In the case of a fixed PHY, the DT node associated
1666          * to the PHY is the Ethernet MAC DT node.
1667          */
1668         if (of_phy_is_fixed_link(dn)) {
1669                 ret = of_phy_register_fixed_link(dn);
1670                 if (ret) {
1671                         dev_err(&pdev->dev, "failed to register fixed PHY\n");
1672                         goto err;
1673                 }
1674
1675                 priv->phy_dn = dn;
1676         }
1677
1678         /* Initialize netdevice members */
1679         macaddr = of_get_mac_address(dn);
1680         if (!macaddr || !is_valid_ether_addr(macaddr)) {
1681                 dev_warn(&pdev->dev, "using random Ethernet MAC\n");
1682                 random_ether_addr(dev->dev_addr);
1683         } else {
1684                 ether_addr_copy(dev->dev_addr, macaddr);
1685         }
1686
1687         SET_NETDEV_DEV(dev, &pdev->dev);
1688         dev_set_drvdata(&pdev->dev, dev);
1689         dev->ethtool_ops = &bcm_sysport_ethtool_ops;
1690         dev->netdev_ops = &bcm_sysport_netdev_ops;
1691         netif_napi_add(dev, &priv->napi, bcm_sysport_poll, 64);
1692
1693         /* HW supported features, none enabled by default */
1694         dev->hw_features |= NETIF_F_RXCSUM | NETIF_F_HIGHDMA |
1695                                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1696
1697         /* Request the WOL interrupt and advertise suspend if available */
1698         priv->wol_irq_disabled = 1;
1699         ret = devm_request_irq(&pdev->dev, priv->wol_irq,
1700                                bcm_sysport_wol_isr, 0, dev->name, priv);
1701         if (!ret)
1702                 device_set_wakeup_capable(&pdev->dev, 1);
1703
1704         /* Set the needed headroom once and for all */
1705         BUILD_BUG_ON(sizeof(struct bcm_tsb) != 8);
1706         dev->needed_headroom += sizeof(struct bcm_tsb);
1707
1708         /* libphy will adjust the link state accordingly */
1709         netif_carrier_off(dev);
1710
1711         ret = register_netdev(dev);
1712         if (ret) {
1713                 dev_err(&pdev->dev, "failed to register net_device\n");
1714                 goto err;
1715         }
1716
1717         priv->rev = topctrl_readl(priv, REV_CNTL) & REV_MASK;
1718         dev_info(&pdev->dev,
1719                  "Broadcom SYSTEMPORT" REV_FMT
1720                  " at 0x%p (irqs: %d, %d, TXQs: %d, RXQs: %d)\n",
1721                  (priv->rev >> 8) & 0xff, priv->rev & 0xff,
1722                  priv->base, priv->irq0, priv->irq1, txq, rxq);
1723
1724         return 0;
1725 err:
1726         free_netdev(dev);
1727         return ret;
1728 }
1729
1730 static int bcm_sysport_remove(struct platform_device *pdev)
1731 {
1732         struct net_device *dev = dev_get_drvdata(&pdev->dev);
1733
1734         /* Not much to do, ndo_close has been called
1735          * and we use managed allocations
1736          */
1737         unregister_netdev(dev);
1738         free_netdev(dev);
1739         dev_set_drvdata(&pdev->dev, NULL);
1740
1741         return 0;
1742 }
1743
1744 #ifdef CONFIG_PM_SLEEP
1745 static int bcm_sysport_suspend_to_wol(struct bcm_sysport_priv *priv)
1746 {
1747         struct net_device *ndev = priv->netdev;
1748         unsigned int timeout = 1000;
1749         u32 reg;
1750
1751         /* Password has already been programmed */
1752         reg = umac_readl(priv, UMAC_MPD_CTRL);
1753         reg |= MPD_EN;
1754         reg &= ~PSW_EN;
1755         if (priv->wolopts & WAKE_MAGICSECURE)
1756                 reg |= PSW_EN;
1757         umac_writel(priv, reg, UMAC_MPD_CTRL);
1758
1759         /* Make sure RBUF entered WoL mode as result */
1760         do {
1761                 reg = rbuf_readl(priv, RBUF_STATUS);
1762                 if (reg & RBUF_WOL_MODE)
1763                         break;
1764
1765                 udelay(10);
1766         } while (timeout-- > 0);
1767
1768         /* Do not leave the UniMAC RBUF matching only MPD packets */
1769         if (!timeout) {
1770                 reg = umac_readl(priv, UMAC_MPD_CTRL);
1771                 reg &= ~MPD_EN;
1772                 umac_writel(priv, reg, UMAC_MPD_CTRL);
1773                 netif_err(priv, wol, ndev, "failed to enter WOL mode\n");
1774                 return -ETIMEDOUT;
1775         }
1776
1777         /* UniMAC receive needs to be turned on */
1778         umac_enable_set(priv, CMD_RX_EN, 1);
1779
1780         /* Enable the interrupt wake-up source */
1781         intrl2_0_mask_clear(priv, INTRL2_0_MPD);
1782
1783         netif_dbg(priv, wol, ndev, "entered WOL mode\n");
1784
1785         return 0;
1786 }
1787
1788 static int bcm_sysport_suspend(struct device *d)
1789 {
1790         struct net_device *dev = dev_get_drvdata(d);
1791         struct bcm_sysport_priv *priv = netdev_priv(dev);
1792         unsigned int i;
1793         int ret = 0;
1794         u32 reg;
1795
1796         if (!netif_running(dev))
1797                 return 0;
1798
1799         bcm_sysport_netif_stop(dev);
1800
1801         phy_suspend(priv->phydev);
1802
1803         netif_device_detach(dev);
1804
1805         /* Disable UniMAC RX */
1806         umac_enable_set(priv, CMD_RX_EN, 0);
1807
1808         ret = rdma_enable_set(priv, 0);
1809         if (ret) {
1810                 netdev_err(dev, "RDMA timeout!\n");
1811                 return ret;
1812         }
1813
1814         /* Disable RXCHK if enabled */
1815         if (priv->rx_chk_en) {
1816                 reg = rxchk_readl(priv, RXCHK_CONTROL);
1817                 reg &= ~RXCHK_EN;
1818                 rxchk_writel(priv, reg, RXCHK_CONTROL);
1819         }
1820
1821         /* Flush RX pipe */
1822         if (!priv->wolopts)
1823                 topctrl_writel(priv, RX_FLUSH, RX_FLUSH_CNTL);
1824
1825         ret = tdma_enable_set(priv, 0);
1826         if (ret) {
1827                 netdev_err(dev, "TDMA timeout!\n");
1828                 return ret;
1829         }
1830
1831         /* Wait for a packet boundary */
1832         usleep_range(2000, 3000);
1833
1834         umac_enable_set(priv, CMD_TX_EN, 0);
1835
1836         topctrl_writel(priv, TX_FLUSH, TX_FLUSH_CNTL);
1837
1838         /* Free RX/TX rings SW structures */
1839         for (i = 0; i < dev->num_tx_queues; i++)
1840                 bcm_sysport_fini_tx_ring(priv, i);
1841         bcm_sysport_fini_rx_ring(priv);
1842
1843         /* Get prepared for Wake-on-LAN */
1844         if (device_may_wakeup(d) && priv->wolopts)
1845                 ret = bcm_sysport_suspend_to_wol(priv);
1846
1847         return ret;
1848 }
1849
1850 static int bcm_sysport_resume(struct device *d)
1851 {
1852         struct net_device *dev = dev_get_drvdata(d);
1853         struct bcm_sysport_priv *priv = netdev_priv(dev);
1854         unsigned int i;
1855         u32 reg;
1856         int ret;
1857
1858         if (!netif_running(dev))
1859                 return 0;
1860
1861         /* We may have been suspended and never received a WOL event that
1862          * would turn off MPD detection, take care of that now
1863          */
1864         bcm_sysport_resume_from_wol(priv);
1865
1866         /* Initialize both hardware and software ring */
1867         for (i = 0; i < dev->num_tx_queues; i++) {
1868                 ret = bcm_sysport_init_tx_ring(priv, i);
1869                 if (ret) {
1870                         netdev_err(dev, "failed to initialize TX ring %d\n",
1871                                    i);
1872                         goto out_free_tx_rings;
1873                 }
1874         }
1875
1876         /* Initialize linked-list */
1877         tdma_writel(priv, TDMA_LL_RAM_INIT_BUSY, TDMA_STATUS);
1878
1879         /* Initialize RX ring */
1880         ret = bcm_sysport_init_rx_ring(priv);
1881         if (ret) {
1882                 netdev_err(dev, "failed to initialize RX ring\n");
1883                 goto out_free_rx_ring;
1884         }
1885
1886         netif_device_attach(dev);
1887
1888         /* Enable RX interrupt and TX ring full interrupt */
1889         intrl2_0_mask_clear(priv, INTRL2_0_RDMA_MBDONE | INTRL2_0_TX_RING_FULL);
1890
1891         /* RX pipe enable */
1892         topctrl_writel(priv, 0, RX_FLUSH_CNTL);
1893
1894         ret = rdma_enable_set(priv, 1);
1895         if (ret) {
1896                 netdev_err(dev, "failed to enable RDMA\n");
1897                 goto out_free_rx_ring;
1898         }
1899
1900         /* Enable rxhck */
1901         if (priv->rx_chk_en) {
1902                 reg = rxchk_readl(priv, RXCHK_CONTROL);
1903                 reg |= RXCHK_EN;
1904                 rxchk_writel(priv, reg, RXCHK_CONTROL);
1905         }
1906
1907         rbuf_init(priv);
1908
1909         /* Set maximum frame length */
1910         umac_writel(priv, UMAC_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
1911
1912         /* Set MAC address */
1913         umac_set_hw_addr(priv, dev->dev_addr);
1914
1915         umac_enable_set(priv, CMD_RX_EN, 1);
1916
1917         /* TX pipe enable */
1918         topctrl_writel(priv, 0, TX_FLUSH_CNTL);
1919
1920         umac_enable_set(priv, CMD_TX_EN, 1);
1921
1922         ret = tdma_enable_set(priv, 1);
1923         if (ret) {
1924                 netdev_err(dev, "TDMA timeout!\n");
1925                 goto out_free_rx_ring;
1926         }
1927
1928         phy_resume(priv->phydev);
1929
1930         bcm_sysport_netif_start(dev);
1931
1932         return 0;
1933
1934 out_free_rx_ring:
1935         bcm_sysport_fini_rx_ring(priv);
1936 out_free_tx_rings:
1937         for (i = 0; i < dev->num_tx_queues; i++)
1938                 bcm_sysport_fini_tx_ring(priv, i);
1939         return ret;
1940 }
1941 #endif
1942
1943 static SIMPLE_DEV_PM_OPS(bcm_sysport_pm_ops,
1944                 bcm_sysport_suspend, bcm_sysport_resume);
1945
1946 static const struct of_device_id bcm_sysport_of_match[] = {
1947         { .compatible = "brcm,systemport-v1.00" },
1948         { .compatible = "brcm,systemport" },
1949         { /* sentinel */ }
1950 };
1951
1952 static struct platform_driver bcm_sysport_driver = {
1953         .probe  = bcm_sysport_probe,
1954         .remove = bcm_sysport_remove,
1955         .driver =  {
1956                 .name = "brcm-systemport",
1957                 .owner = THIS_MODULE,
1958                 .of_match_table = bcm_sysport_of_match,
1959                 .pm = &bcm_sysport_pm_ops,
1960         },
1961 };
1962 module_platform_driver(bcm_sysport_driver);
1963
1964 MODULE_AUTHOR("Broadcom Corporation");
1965 MODULE_DESCRIPTION("Broadcom System Port Ethernet MAC driver");
1966 MODULE_ALIAS("platform:brcm-systemport");
1967 MODULE_LICENSE("GPL");