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         unsigned long desc_flags;
  94
  95         /* Ports are latched, so write upper address first */
  96         spin_lock_irqsave(&priv->desc_lock, desc_flags);
  97         tdma_writel(priv, desc->addr_status_len, TDMA_WRITE_PORT_HI(port));
  98         tdma_writel(priv, desc->addr_lo, TDMA_WRITE_PORT_LO(port));
  99         spin_unlock_irqrestore(&priv->desc_lock, desc_flags);
 100 }
 101
 102 /* Ethtool operations */
 103 static int bcm_sysport_set_settings(struct net_device *dev,
 104                                     struct ethtool_cmd *cmd)
 105 {
 106         struct bcm_sysport_priv *priv = netdev_priv(dev);
 107
 108         if (!netif_running(dev))
 109                 return -EINVAL;
 110
 111         return phy_ethtool_sset(priv->phydev, cmd);
 112 }
 113
 114 static int bcm_sysport_get_settings(struct net_device *dev,
 115                                     struct ethtool_cmd *cmd)
 116 {
 117         struct bcm_sysport_priv *priv = netdev_priv(dev);
 118
 119         if (!netif_running(dev))
 120                 return -EINVAL;
 121
 122         return phy_ethtool_gset(priv->phydev, cmd);
 123 }
 124
 125 static int bcm_sysport_set_rx_csum(struct net_device *dev,
 126                                    netdev_features_t wanted)
 127 {
 128         struct bcm_sysport_priv *priv = netdev_priv(dev);
 129         u32 reg;
 130
 131         priv->rx_chk_en = !!(wanted & NETIF_F_RXCSUM);
 132         reg = rxchk_readl(priv, RXCHK_CONTROL);
 133         /* Clear L2 header checks, which would prevent BPDUs
 134          * from being received.
 135          */
 136         reg &= ~RXCHK_L2_HDR_DIS;
 137         if (priv->rx_chk_en)
 138                 reg |= RXCHK_EN;
 139         else
 140                 reg &= ~RXCHK_EN;
 141
 142         /* If UniMAC forwards CRC, we need to skip over it to get
 143          * a valid CHK bit to be set in the per-packet status word
 144          */
 145         if (priv->rx_chk_en && priv->crc_fwd)
 146                 reg |= RXCHK_SKIP_FCS;
 147         else
 148                 reg &= ~RXCHK_SKIP_FCS;
 149
 150         /* If Broadcom tags are enabled (e.g: using a switch), make
 151          * sure we tell the RXCHK hardware to expect a 4-bytes Broadcom
 152          * tag after the Ethernet MAC Source Address.
 153          */
 154         if (netdev_uses_dsa(dev))
 155                 reg |= RXCHK_BRCM_TAG_EN;
 156         else
 157                 reg &= ~RXCHK_BRCM_TAG_EN;
 158
 159         rxchk_writel(priv, reg, RXCHK_CONTROL);
 160
 161         return 0;
 162 }
 163
 164 static int bcm_sysport_set_tx_csum(struct net_device *dev,
 165                                    netdev_features_t wanted)
 166 {
 167         struct bcm_sysport_priv *priv = netdev_priv(dev);
 168         u32 reg;
 169
 170         /* Hardware transmit checksum requires us to enable the Transmit status
 171          * block prepended to the packet contents
 172          */
 173         priv->tsb_en = !!(wanted & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM));
 174         reg = tdma_readl(priv, TDMA_CONTROL);
 175         if (priv->tsb_en)
 176                 reg |= TSB_EN;
 177         else
 178                 reg &= ~TSB_EN;
 179         tdma_writel(priv, reg, TDMA_CONTROL);
 180
 181         return 0;
 182 }
 183
 184 static int bcm_sysport_set_features(struct net_device *dev,
 185                                     netdev_features_t features)
 186 {
 187         netdev_features_t changed = features ^ dev->features;
 188         netdev_features_t wanted = dev->wanted_features;
 189         int ret = 0;
 190
 191         if (changed & NETIF_F_RXCSUM)
 192                 ret = bcm_sysport_set_rx_csum(dev, wanted);
 193         if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
 194                 ret = bcm_sysport_set_tx_csum(dev, wanted);
 195
 196         return ret;
 197 }
 198
 199 /* Hardware counters must be kept in sync because the order/offset
 200  * is important here (order in structure declaration = order in hardware)
 201  */
 202 static const struct bcm_sysport_stats bcm_sysport_gstrings_stats[] = {
 203         /* general stats */
 204         STAT_NETDEV(rx_packets),
 205         STAT_NETDEV(tx_packets),
 206         STAT_NETDEV(rx_bytes),
 207         STAT_NETDEV(tx_bytes),
 208         STAT_NETDEV(rx_errors),
 209         STAT_NETDEV(tx_errors),
 210         STAT_NETDEV(rx_dropped),
 211         STAT_NETDEV(tx_dropped),
 212         STAT_NETDEV(multicast),
 213         /* UniMAC RSV counters */
 214         STAT_MIB_RX("rx_64_octets", mib.rx.pkt_cnt.cnt_64),
 215         STAT_MIB_RX("rx_65_127_oct", mib.rx.pkt_cnt.cnt_127),
 216         STAT_MIB_RX("rx_128_255_oct", mib.rx.pkt_cnt.cnt_255),
 217         STAT_MIB_RX("rx_256_511_oct", mib.rx.pkt_cnt.cnt_511),
 218         STAT_MIB_RX("rx_512_1023_oct", mib.rx.pkt_cnt.cnt_1023),
 219         STAT_MIB_RX("rx_1024_1518_oct", mib.rx.pkt_cnt.cnt_1518),
 220         STAT_MIB_RX("rx_vlan_1519_1522_oct", mib.rx.pkt_cnt.cnt_mgv),
 221         STAT_MIB_RX("rx_1522_2047_oct", mib.rx.pkt_cnt.cnt_2047),
 222         STAT_MIB_RX("rx_2048_4095_oct", mib.rx.pkt_cnt.cnt_4095),
 223         STAT_MIB_RX("rx_4096_9216_oct", mib.rx.pkt_cnt.cnt_9216),
 224         STAT_MIB_RX("rx_pkts", mib.rx.pkt),
 225         STAT_MIB_RX("rx_bytes", mib.rx.bytes),
 226         STAT_MIB_RX("rx_multicast", mib.rx.mca),
 227         STAT_MIB_RX("rx_broadcast", mib.rx.bca),
 228         STAT_MIB_RX("rx_fcs", mib.rx.fcs),
 229         STAT_MIB_RX("rx_control", mib.rx.cf),
 230         STAT_MIB_RX("rx_pause", mib.rx.pf),
 231         STAT_MIB_RX("rx_unknown", mib.rx.uo),
 232         STAT_MIB_RX("rx_align", mib.rx.aln),
 233         STAT_MIB_RX("rx_outrange", mib.rx.flr),
 234         STAT_MIB_RX("rx_code", mib.rx.cde),
 235         STAT_MIB_RX("rx_carrier", mib.rx.fcr),
 236         STAT_MIB_RX("rx_oversize", mib.rx.ovr),
 237         STAT_MIB_RX("rx_jabber", mib.rx.jbr),
 238         STAT_MIB_RX("rx_mtu_err", mib.rx.mtue),
 239         STAT_MIB_RX("rx_good_pkts", mib.rx.pok),
 240         STAT_MIB_RX("rx_unicast", mib.rx.uc),
 241         STAT_MIB_RX("rx_ppp", mib.rx.ppp),
 242         STAT_MIB_RX("rx_crc", mib.rx.rcrc),
 243         /* UniMAC TSV counters */
 244         STAT_MIB_TX("tx_64_octets", mib.tx.pkt_cnt.cnt_64),
 245         STAT_MIB_TX("tx_65_127_oct", mib.tx.pkt_cnt.cnt_127),
 246         STAT_MIB_TX("tx_128_255_oct", mib.tx.pkt_cnt.cnt_255),
 247         STAT_MIB_TX("tx_256_511_oct", mib.tx.pkt_cnt.cnt_511),
 248         STAT_MIB_TX("tx_512_1023_oct", mib.tx.pkt_cnt.cnt_1023),
 249         STAT_MIB_TX("tx_1024_1518_oct", mib.tx.pkt_cnt.cnt_1518),
 250         STAT_MIB_TX("tx_vlan_1519_1522_oct", mib.tx.pkt_cnt.cnt_mgv),
 251         STAT_MIB_TX("tx_1522_2047_oct", mib.tx.pkt_cnt.cnt_2047),
 252         STAT_MIB_TX("tx_2048_4095_oct", mib.tx.pkt_cnt.cnt_4095),
 253         STAT_MIB_TX("tx_4096_9216_oct", mib.tx.pkt_cnt.cnt_9216),
 254         STAT_MIB_TX("tx_pkts", mib.tx.pkts),
 255         STAT_MIB_TX("tx_multicast", mib.tx.mca),
 256         STAT_MIB_TX("tx_broadcast", mib.tx.bca),
 257         STAT_MIB_TX("tx_pause", mib.tx.pf),
 258         STAT_MIB_TX("tx_control", mib.tx.cf),
 259         STAT_MIB_TX("tx_fcs_err", mib.tx.fcs),
 260         STAT_MIB_TX("tx_oversize", mib.tx.ovr),
 261         STAT_MIB_TX("tx_defer", mib.tx.drf),
 262         STAT_MIB_TX("tx_excess_defer", mib.tx.edf),
 263         STAT_MIB_TX("tx_single_col", mib.tx.scl),
 264         STAT_MIB_TX("tx_multi_col", mib.tx.mcl),
 265         STAT_MIB_TX("tx_late_col", mib.tx.lcl),
 266         STAT_MIB_TX("tx_excess_col", mib.tx.ecl),
 267         STAT_MIB_TX("tx_frags", mib.tx.frg),
 268         STAT_MIB_TX("tx_total_col", mib.tx.ncl),
 269         STAT_MIB_TX("tx_jabber", mib.tx.jbr),
 270         STAT_MIB_TX("tx_bytes", mib.tx.bytes),
 271         STAT_MIB_TX("tx_good_pkts", mib.tx.pok),
 272         STAT_MIB_TX("tx_unicast", mib.tx.uc),
 273         /* UniMAC RUNT counters */
 274         STAT_RUNT("rx_runt_pkts", mib.rx_runt_cnt),
 275         STAT_RUNT("rx_runt_valid_fcs", mib.rx_runt_fcs),
 276         STAT_RUNT("rx_runt_inval_fcs_align", mib.rx_runt_fcs_align),
 277         STAT_RUNT("rx_runt_bytes", mib.rx_runt_bytes),
 278         /* RXCHK misc statistics */
 279         STAT_RXCHK("rxchk_bad_csum", mib.rxchk_bad_csum, RXCHK_BAD_CSUM_CNTR),
 280         STAT_RXCHK("rxchk_other_pkt_disc", mib.rxchk_other_pkt_disc,
 281                    RXCHK_OTHER_DISC_CNTR),
 282         /* RBUF misc statistics */
 283         STAT_RBUF("rbuf_ovflow_cnt", mib.rbuf_ovflow_cnt, RBUF_OVFL_DISC_CNTR),
 284         STAT_RBUF("rbuf_err_cnt", mib.rbuf_err_cnt, RBUF_ERR_PKT_CNTR),
 285         STAT_MIB_SOFT("alloc_rx_buff_failed", mib.alloc_rx_buff_failed),
 286         STAT_MIB_SOFT("rx_dma_failed", mib.rx_dma_failed),
 287         STAT_MIB_SOFT("tx_dma_failed", mib.tx_dma_failed),
 288 };
 289
 290 #define BCM_SYSPORT_STATS_LEN   ARRAY_SIZE(bcm_sysport_gstrings_stats)
 291
 292 static void bcm_sysport_get_drvinfo(struct net_device *dev,
 293                                     struct ethtool_drvinfo *info)
 294 {
 295         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 296         strlcpy(info->version, "0.1", sizeof(info->version));
 297         strlcpy(info->bus_info, "platform", sizeof(info->bus_info));
 298 }
 299
 300 static u32 bcm_sysport_get_msglvl(struct net_device *dev)
 301 {
 302         struct bcm_sysport_priv *priv = netdev_priv(dev);
 303
 304         return priv->msg_enable;
 305 }
 306
 307 static void bcm_sysport_set_msglvl(struct net_device *dev, u32 enable)
 308 {
 309         struct bcm_sysport_priv *priv = netdev_priv(dev);
 310
 311         priv->msg_enable = enable;
 312 }
 313
 314 static int bcm_sysport_get_sset_count(struct net_device *dev, int string_set)
 315 {
 316         switch (string_set) {
 317         case ETH_SS_STATS:
 318                 return BCM_SYSPORT_STATS_LEN;
 319         default:
 320                 return -EOPNOTSUPP;
 321         }
 322 }
 323
 324 static void bcm_sysport_get_strings(struct net_device *dev,
 325                                     u32 stringset, u8 *data)
 326 {
 327         int i;
 328
 329         switch (stringset) {
 330         case ETH_SS_STATS:
 331                 for (i = 0; i < BCM_SYSPORT_STATS_LEN; i++) {
 332                         memcpy(data + i * ETH_GSTRING_LEN,
 333                                bcm_sysport_gstrings_stats[i].stat_string,
 334                                ETH_GSTRING_LEN);
 335                 }
 336                 break;
 337         default:
 338                 break;
 339         }
 340 }
 341
 342 static void bcm_sysport_update_mib_counters(struct bcm_sysport_priv *priv)
 343 {
 344         int i, j = 0;
 345
 346         for (i = 0; i < BCM_SYSPORT_STATS_LEN; i++) {
 347                 const struct bcm_sysport_stats *s;
 348                 u8 offset = 0;
 349                 u32 val = 0;
 350                 char *p;
 351
 352                 s = &bcm_sysport_gstrings_stats[i];
 353                 switch (s->type) {
 354                 case BCM_SYSPORT_STAT_NETDEV:
 355                 case BCM_SYSPORT_STAT_SOFT:
 356                         continue;
 357                 case BCM_SYSPORT_STAT_MIB_RX:
 358                 case BCM_SYSPORT_STAT_MIB_TX:
 359                 case BCM_SYSPORT_STAT_RUNT:
 360                         if (s->type != BCM_SYSPORT_STAT_MIB_RX)
 361                                 offset = UMAC_MIB_STAT_OFFSET;
 362                         val = umac_readl(priv, UMAC_MIB_START + j + offset);
 363                         break;
 364                 case BCM_SYSPORT_STAT_RXCHK:
 365                         val = rxchk_readl(priv, s->reg_offset);
 366                         if (val == ~0)
 367                                 rxchk_writel(priv, 0, s->reg_offset);
 368                         break;
 369                 case BCM_SYSPORT_STAT_RBUF:
 370                         val = rbuf_readl(priv, s->reg_offset);
 371                         if (val == ~0)
 372                                 rbuf_writel(priv, 0, s->reg_offset);
 373                         break;
 374                 }
 375
 376                 j += s->stat_sizeof;
 377                 p = (char *)priv + s->stat_offset;
 378                 *(u32 *)p = val;
 379         }
 380
 381         netif_dbg(priv, hw, priv->netdev, "updated MIB counters\n");
 382 }
 383
 384 static void bcm_sysport_get_stats(struct net_device *dev,
 385                                   struct ethtool_stats *stats, u64 *data)
 386 {
 387         struct bcm_sysport_priv *priv = netdev_priv(dev);
 388         int i;
 389
 390         if (netif_running(dev))
 391                 bcm_sysport_update_mib_counters(priv);
 392
 393         for (i =  0; i < BCM_SYSPORT_STATS_LEN; i++) {
 394                 const struct bcm_sysport_stats *s;
 395                 char *p;
 396
 397                 s = &bcm_sysport_gstrings_stats[i];
 398                 if (s->type == BCM_SYSPORT_STAT_NETDEV)
 399                         p = (char *)&dev->stats;
 400                 else
 401                         p = (char *)priv;
 402                 p += s->stat_offset;
 403                 data[i] = *(unsigned long *)p;
 404         }
 405 }
 406
 407 static void bcm_sysport_get_wol(struct net_device *dev,
 408                                 struct ethtool_wolinfo *wol)
 409 {
 410         struct bcm_sysport_priv *priv = netdev_priv(dev);
 411
 412         wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE;
 413         wol->wolopts = priv->wolopts;
 414
 415         if (!(priv->wolopts & WAKE_MAGICSECURE))
 416                 return;
 417
 418         memcpy(wol->sopass, priv->sopass, sizeof(priv->sopass));
 419 }
 420
 421 static int bcm_sysport_set_wol(struct net_device *dev,
 422                                struct ethtool_wolinfo *wol)
 423 {
 424         struct bcm_sysport_priv *priv = netdev_priv(dev);
 425         struct device *kdev = &priv->pdev->dev;
 426         u32 supported = WAKE_MAGIC | WAKE_MAGICSECURE;
 427
 428         if (!device_can_wakeup(kdev))
 429                 return -ENOTSUPP;
 430
 431         if (wol->wolopts & ~supported)
 432                 return -EINVAL;
 433
 434         if (wol->wolopts & WAKE_MAGICSECURE)
 435                 memcpy(priv->sopass, wol->sopass, sizeof(priv->sopass));
 436
 437         /* Flag the device and relevant IRQ as wakeup capable */
 438         if (wol->wolopts) {
 439                 device_set_wakeup_enable(kdev, 1);
 440                 if (priv->wol_irq_disabled)
 441                         enable_irq_wake(priv->wol_irq);
 442                 priv->wol_irq_disabled = 0;
 443         } else {
 444                 device_set_wakeup_enable(kdev, 0);
 445                 /* Avoid unbalanced disable_irq_wake calls */
 446                 if (!priv->wol_irq_disabled)
 447                         disable_irq_wake(priv->wol_irq);
 448                 priv->wol_irq_disabled = 1;
 449         }
 450
 451         priv->wolopts = wol->wolopts;
 452
 453         return 0;
 454 }
 455
 456 static int bcm_sysport_get_coalesce(struct net_device *dev,
 457                                     struct ethtool_coalesce *ec)
 458 {
 459         struct bcm_sysport_priv *priv = netdev_priv(dev);
 460         u32 reg;
 461
 462         reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(0));
 463
 464         ec->tx_coalesce_usecs = (reg >> RING_TIMEOUT_SHIFT) * 8192 / 1000;
 465         ec->tx_max_coalesced_frames = reg & RING_INTR_THRESH_MASK;
 466
 467         reg = rdma_readl(priv, RDMA_MBDONE_INTR);
 468
 469         ec->rx_coalesce_usecs = (reg >> RDMA_TIMEOUT_SHIFT) * 8192 / 1000;
 470         ec->rx_max_coalesced_frames = reg & RDMA_INTR_THRESH_MASK;
 471
 472         return 0;
 473 }
 474
 475 static int bcm_sysport_set_coalesce(struct net_device *dev,
 476                                     struct ethtool_coalesce *ec)
 477 {
 478         struct bcm_sysport_priv *priv = netdev_priv(dev);
 479         unsigned int i;
 480         u32 reg;
 481
 482         /* Base system clock is 125Mhz, DMA timeout is this reference clock
 483          * divided by 1024, which yield roughly 8.192 us, our maximum value has
 484          * to fit in the RING_TIMEOUT_MASK (16 bits).
 485          */
 486         if (ec->tx_max_coalesced_frames > RING_INTR_THRESH_MASK ||
 487             ec->tx_coalesce_usecs > (RING_TIMEOUT_MASK * 8) + 1 ||
 488             ec->rx_max_coalesced_frames > RDMA_INTR_THRESH_MASK ||
 489             ec->rx_coalesce_usecs > (RDMA_TIMEOUT_MASK * 8) + 1)
 490                 return -EINVAL;
 491
 492         if ((ec->tx_coalesce_usecs == 0 && ec->tx_max_coalesced_frames == 0) ||
 493             (ec->rx_coalesce_usecs == 0 && ec->rx_max_coalesced_frames == 0))
 494                 return -EINVAL;
 495
 496         for (i = 0; i < dev->num_tx_queues; i++) {
 497                 reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(i));
 498                 reg &= ~(RING_INTR_THRESH_MASK |
 499                          RING_TIMEOUT_MASK << RING_TIMEOUT_SHIFT);
 500                 reg |= ec->tx_max_coalesced_frames;
 501                 reg |= DIV_ROUND_UP(ec->tx_coalesce_usecs * 1000, 8192) <<
 502                          RING_TIMEOUT_SHIFT;
 503                 tdma_writel(priv, reg, TDMA_DESC_RING_INTR_CONTROL(i));
 504         }
 505
 506         reg = rdma_readl(priv, RDMA_MBDONE_INTR);
 507         reg &= ~(RDMA_INTR_THRESH_MASK |
 508                  RDMA_TIMEOUT_MASK << RDMA_TIMEOUT_SHIFT);
 509         reg |= ec->rx_max_coalesced_frames;
 510         reg |= DIV_ROUND_UP(ec->rx_coalesce_usecs * 1000, 8192) <<
 511                             RDMA_TIMEOUT_SHIFT;
 512         rdma_writel(priv, reg, RDMA_MBDONE_INTR);
 513
 514         return 0;
 515 }
 516
 517 static void bcm_sysport_free_cb(struct bcm_sysport_cb *cb)
 518 {
 519         dev_kfree_skb_any(cb->skb);
 520         cb->skb = NULL;
 521         dma_unmap_addr_set(cb, dma_addr, 0);
 522 }
 523
 524 static struct sk_buff *bcm_sysport_rx_refill(struct bcm_sysport_priv *priv,
 525                                              struct bcm_sysport_cb *cb)
 526 {
 527         struct device *kdev = &priv->pdev->dev;
 528         struct net_device *ndev = priv->netdev;
 529         struct sk_buff *skb, *rx_skb;
 530         dma_addr_t mapping;
 531
 532         /* Allocate a new SKB for a new packet */
 533         skb = __netdev_alloc_skb(priv->netdev, RX_BUF_LENGTH,
 534                                  GFP_ATOMIC | __GFP_NOWARN);
 535         if (!skb) {
 536                 priv->mib.alloc_rx_buff_failed++;
 537                 netif_err(priv, rx_err, ndev, "SKB alloc failed\n");
 538                 return NULL;
 539         }
 540
 541         mapping = dma_map_single(kdev, skb->data,
 542                                  RX_BUF_LENGTH, DMA_FROM_DEVICE);
 543         if (dma_mapping_error(kdev, mapping)) {
 544                 priv->mib.rx_dma_failed++;
 545                 dev_kfree_skb_any(skb);
 546                 netif_err(priv, rx_err, ndev, "DMA mapping failure\n");
 547                 return NULL;
 548         }
 549
 550         /* Grab the current SKB on the ring */
 551         rx_skb = cb->skb;
 552         if (likely(rx_skb))
 553                 dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
 554                                  RX_BUF_LENGTH, DMA_FROM_DEVICE);
 555
 556         /* Put the new SKB on the ring */
 557         cb->skb = skb;
 558         dma_unmap_addr_set(cb, dma_addr, mapping);
 559         dma_desc_set_addr(priv, cb->bd_addr, mapping);
 560
 561         netif_dbg(priv, rx_status, ndev, "RX refill\n");
 562
 563         /* Return the current SKB to the caller */
 564         return rx_skb;
 565 }
 566
 567 static int bcm_sysport_alloc_rx_bufs(struct bcm_sysport_priv *priv)
 568 {
 569         struct bcm_sysport_cb *cb;
 570         struct sk_buff *skb;
 571         unsigned int i;
 572
 573         for (i = 0; i < priv->num_rx_bds; i++) {
 574                 cb = &priv->rx_cbs[i];
 575                 skb = bcm_sysport_rx_refill(priv, cb);
 576                 if (skb)
 577                         dev_kfree_skb(skb);
 578                 if (!cb->skb)
 579                         return -ENOMEM;
 580         }
 581
 582         return 0;
 583 }
 584
 585 /* Poll the hardware for up to budget packets to process */
 586 static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
 587                                         unsigned int budget)
 588 {
 589         struct net_device *ndev = priv->netdev;
 590         unsigned int processed = 0, to_process;
 591         struct bcm_sysport_cb *cb;
 592         struct sk_buff *skb;
 593         unsigned int p_index;
 594         u16 len, status;
 595         struct bcm_rsb *rsb;
 596
 597         /* Determine how much we should process since last call */
 598         p_index = rdma_readl(priv, RDMA_PROD_INDEX);
 599         p_index &= RDMA_PROD_INDEX_MASK;
 600
 601         if (p_index < priv->rx_c_index)
 602                 to_process = (RDMA_CONS_INDEX_MASK + 1) -
 603                         priv->rx_c_index + p_index;
 604         else
 605                 to_process = p_index - priv->rx_c_index;
 606
 607         netif_dbg(priv, rx_status, ndev,
 608                   "p_index=%d rx_c_index=%d to_process=%d\n",
 609                   p_index, priv->rx_c_index, to_process);
 610
 611         while ((processed < to_process) && (processed < budget)) {
 612                 cb = &priv->rx_cbs[priv->rx_read_ptr];
 613                 skb = bcm_sysport_rx_refill(priv, cb);
 614
 615
 616                 /* We do not have a backing SKB, so we do not a corresponding
 617                  * DMA mapping for this incoming packet since
 618                  * bcm_sysport_rx_refill always either has both skb and mapping
 619                  * or none.
 620                  */
 621                 if (unlikely(!skb)) {
 622                         netif_err(priv, rx_err, ndev, "out of memory!\n");
 623                         ndev->stats.rx_dropped++;
 624                         ndev->stats.rx_errors++;
 625                         goto next;
 626                 }
 627
 628                 /* Extract the Receive Status Block prepended */
 629                 rsb = (struct bcm_rsb *)skb->data;
 630                 len = (rsb->rx_status_len >> DESC_LEN_SHIFT) & DESC_LEN_MASK;
 631                 status = (rsb->rx_status_len >> DESC_STATUS_SHIFT) &
 632                           DESC_STATUS_MASK;
 633
 634                 netif_dbg(priv, rx_status, ndev,
 635                           "p=%d, c=%d, rd_ptr=%d, len=%d, flag=0x%04x\n",
 636                           p_index, priv->rx_c_index, priv->rx_read_ptr,
 637                           len, status);
 638
 639                 if (unlikely(len > RX_BUF_LENGTH)) {
 640                         netif_err(priv, rx_status, ndev, "oversized packet\n");
 641                         ndev->stats.rx_length_errors++;
 642                         ndev->stats.rx_errors++;
 643                         dev_kfree_skb_any(skb);
 644                         goto next;
 645                 }
 646
 647                 if (unlikely(!(status & DESC_EOP) || !(status & DESC_SOP))) {
 648                         netif_err(priv, rx_status, ndev, "fragmented packet!\n");
 649                         ndev->stats.rx_dropped++;
 650                         ndev->stats.rx_errors++;
 651                         dev_kfree_skb_any(skb);
 652                         goto next;
 653                 }
 654
 655                 if (unlikely(status & (RX_STATUS_ERR | RX_STATUS_OVFLOW))) {
 656                         netif_err(priv, rx_err, ndev, "error packet\n");
 657                         if (status & RX_STATUS_OVFLOW)
 658                                 ndev->stats.rx_over_errors++;
 659                         ndev->stats.rx_dropped++;
 660                         ndev->stats.rx_errors++;
 661                         dev_kfree_skb_any(skb);
 662                         goto next;
 663                 }
 664
 665                 skb_put(skb, len);
 666
 667                 /* Hardware validated our checksum */
 668                 if (likely(status & DESC_L4_CSUM))
 669                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 670
 671                 /* Hardware pre-pends packets with 2bytes before Ethernet
 672                  * header plus we have the Receive Status Block, strip off all
 673                  * of this from the SKB.
 674                  */
 675                 skb_pull(skb, sizeof(*rsb) + 2);
 676                 len -= (sizeof(*rsb) + 2);
 677
 678                 /* UniMAC may forward CRC */
 679                 if (priv->crc_fwd) {
 680                         skb_trim(skb, len - ETH_FCS_LEN);
 681                         len -= ETH_FCS_LEN;
 682                 }
 683
 684                 skb->protocol = eth_type_trans(skb, ndev);
 685                 ndev->stats.rx_packets++;
 686                 ndev->stats.rx_bytes += len;
 687
 688                 napi_gro_receive(&priv->napi, skb);
 689 next:
 690                 processed++;
 691                 priv->rx_read_ptr++;
 692
 693                 if (priv->rx_read_ptr == priv->num_rx_bds)
 694                         priv->rx_read_ptr = 0;
 695         }
 696
 697         return processed;
 698 }
 699
 700 static void bcm_sysport_tx_reclaim_one(struct bcm_sysport_priv *priv,
 701                                        struct bcm_sysport_cb *cb,
 702                                        unsigned int *bytes_compl,
 703                                        unsigned int *pkts_compl)
 704 {
 705         struct device *kdev = &priv->pdev->dev;
 706         struct net_device *ndev = priv->netdev;
 707
 708         if (cb->skb) {
 709                 ndev->stats.tx_bytes += cb->skb->len;
 710                 *bytes_compl += cb->skb->len;
 711                 dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
 712                                  dma_unmap_len(cb, dma_len),
 713                                  DMA_TO_DEVICE);
 714                 ndev->stats.tx_packets++;
 715                 (*pkts_compl)++;
 716                 bcm_sysport_free_cb(cb);
 717         /* SKB fragment */
 718         } else if (dma_unmap_addr(cb, dma_addr)) {
 719                 ndev->stats.tx_bytes += dma_unmap_len(cb, dma_len);
 720                 dma_unmap_page(kdev, dma_unmap_addr(cb, dma_addr),
 721                                dma_unmap_len(cb, dma_len), DMA_TO_DEVICE);
 722                 dma_unmap_addr_set(cb, dma_addr, 0);
 723         }
 724 }
 725
 726 /* Reclaim queued SKBs for transmission completion, lockless version */
 727 static unsigned int __bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
 728                                              struct bcm_sysport_tx_ring *ring)
 729 {
 730         struct net_device *ndev = priv->netdev;
 731         unsigned int pkts_compl = 0, bytes_compl = 0;
 732         unsigned int txbds_processed = 0;
 733         struct bcm_sysport_cb *cb;
 734         unsigned int txbds_ready;
 735         unsigned int c_index;
 736         u32 hw_ind;
 737
 738         /* Compute how many descriptors have been processed since last call */
 739         hw_ind = tdma_readl(priv, TDMA_DESC_RING_PROD_CONS_INDEX(ring->index));
 740         c_index = (hw_ind >> RING_CONS_INDEX_SHIFT) & RING_CONS_INDEX_MASK;
 741         txbds_ready = (c_index - ring->c_index) & RING_CONS_INDEX_MASK;
 742
 743         netif_dbg(priv, tx_done, ndev,
 744                   "ring=%d old_c_index=%u c_index=%u txbds_ready=%u\n",
 745                   ring->index, ring->c_index, c_index, txbds_ready);
 746
 747         while (txbds_processed < txbds_ready) {
 748                 cb = &ring->cbs[ring->clean_index];
 749                 bcm_sysport_tx_reclaim_one(priv, cb, &bytes_compl, &pkts_compl);
 750
 751                 ring->desc_count++;
 752                 txbds_processed++;
 753
 754                 if (likely(ring->clean_index < ring->size - 1))
 755                         ring->clean_index++;
 756                 else
 757                         ring->clean_index = 0;
 758         }
 759
 760         ring->c_index = c_index;
 761
 762         netif_dbg(priv, tx_done, ndev,
 763                   "ring=%d c_index=%d pkts_compl=%d, bytes_compl=%d\n",
 764                   ring->index, ring->c_index, pkts_compl, bytes_compl);
 765
 766         return pkts_compl;
 767 }
 768
 769 /* Locked version of the per-ring TX reclaim routine */
 770 static unsigned int bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
 771                                            struct bcm_sysport_tx_ring *ring)
 772 {
 773         struct netdev_queue *txq;
 774         unsigned int released;
 775         unsigned long flags;
 776
 777         txq = netdev_get_tx_queue(priv->netdev, ring->index);
 778
 779         spin_lock_irqsave(&ring->lock, flags);
 780         released = __bcm_sysport_tx_reclaim(priv, ring);
 781         if (released)
 782                 netif_tx_wake_queue(txq);
 783
 784         spin_unlock_irqrestore(&ring->lock, flags);
 785
 786         return released;
 787 }
 788
 789 /* Locked version of the per-ring TX reclaim, but does not wake the queue */
 790 static void bcm_sysport_tx_clean(struct bcm_sysport_priv *priv,
 791                                  struct bcm_sysport_tx_ring *ring)
 792 {
 793         unsigned long flags;
 794
 795         spin_lock_irqsave(&ring->lock, flags);
 796         __bcm_sysport_tx_reclaim(priv, ring);
 797         spin_unlock_irqrestore(&ring->lock, flags);
 798 }
 799
 800 static int bcm_sysport_tx_poll(struct napi_struct *napi, int budget)
 801 {
 802         struct bcm_sysport_tx_ring *ring =
 803                 container_of(napi, struct bcm_sysport_tx_ring, napi);
 804         unsigned int work_done = 0;
 805
 806         work_done = bcm_sysport_tx_reclaim(ring->priv, ring);
 807
 808         if (work_done == 0) {
 809                 napi_complete(napi);
 810                 /* re-enable TX interrupt */
 811                 intrl2_1_mask_clear(ring->priv, BIT(ring->index));
 812
 813                 return 0;
 814         }
 815
 816         return budget;
 817 }
 818
 819 static void bcm_sysport_tx_reclaim_all(struct bcm_sysport_priv *priv)
 820 {
 821         unsigned int q;
 822
 823         for (q = 0; q < priv->netdev->num_tx_queues; q++)
 824                 bcm_sysport_tx_reclaim(priv, &priv->tx_rings[q]);
 825 }
 826
 827 static int bcm_sysport_poll(struct napi_struct *napi, int budget)
 828 {
 829         struct bcm_sysport_priv *priv =
 830                 container_of(napi, struct bcm_sysport_priv, napi);
 831         unsigned int work_done = 0;
 832
 833         work_done = bcm_sysport_desc_rx(priv, budget);
 834
 835         priv->rx_c_index += work_done;
 836         priv->rx_c_index &= RDMA_CONS_INDEX_MASK;
 837         rdma_writel(priv, priv->rx_c_index, RDMA_CONS_INDEX);
 838
 839         if (work_done < budget) {
 840                 napi_complete(napi);
 841                 /* re-enable RX interrupts */
 842                 intrl2_0_mask_clear(priv, INTRL2_0_RDMA_MBDONE);
 843         }
 844
 845         return work_done;
 846 }
 847
 848 static void bcm_sysport_resume_from_wol(struct bcm_sysport_priv *priv)
 849 {
 850         u32 reg;
 851
 852         /* Clear the MagicPacket detection logic */
 853         reg = umac_readl(priv, UMAC_MPD_CTRL);
 854         reg &= ~MPD_EN;
 855         umac_writel(priv, reg, UMAC_MPD_CTRL);
 856
 857         reg = intrl2_0_readl(priv, INTRL2_CPU_STATUS);
 858         if (reg & INTRL2_0_MPD)
 859                 netdev_info(priv->netdev, "Wake-on-LAN (MPD) interrupt!\n");
 860
 861         if (reg & INTRL2_0_BRCM_MATCH_TAG) {
 862                 reg = rxchk_readl(priv, RXCHK_BRCM_TAG_MATCH_STATUS) &
 863                                   RXCHK_BRCM_TAG_MATCH_MASK;
 864                 netdev_info(priv->netdev,
 865                             "Wake-on-LAN (filters 0x%02x) interrupt!\n", reg);
 866         }
 867
 868         netif_dbg(priv, wol, priv->netdev, "resumed from WOL\n");
 869 }
 870
 871 /* RX and misc interrupt routine */
 872 static irqreturn_t bcm_sysport_rx_isr(int irq, void *dev_id)
 873 {
 874         struct net_device *dev = dev_id;
 875         struct bcm_sysport_priv *priv = netdev_priv(dev);
 876
 877         priv->irq0_stat = intrl2_0_readl(priv, INTRL2_CPU_STATUS) &
 878                           ~intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
 879         intrl2_0_writel(priv, priv->irq0_stat, INTRL2_CPU_CLEAR);
 880
 881         if (unlikely(priv->irq0_stat == 0)) {
 882                 netdev_warn(priv->netdev, "spurious RX interrupt\n");
 883                 return IRQ_NONE;
 884         }
 885
 886         if (priv->irq0_stat & INTRL2_0_RDMA_MBDONE) {
 887                 if (likely(napi_schedule_prep(&priv->napi))) {
 888                         /* disable RX interrupts */
 889                         intrl2_0_mask_set(priv, INTRL2_0_RDMA_MBDONE);
 890                         __napi_schedule(&priv->napi);
 891                 }
 892         }
 893
 894         /* TX ring is full, perform a full reclaim since we do not know
 895          * which one would trigger this interrupt
 896          */
 897         if (priv->irq0_stat & INTRL2_0_TX_RING_FULL)
 898                 bcm_sysport_tx_reclaim_all(priv);
 899
 900         return IRQ_HANDLED;
 901 }
 902
 903 /* TX interrupt service routine */
 904 static irqreturn_t bcm_sysport_tx_isr(int irq, void *dev_id)
 905 {
 906         struct net_device *dev = dev_id;
 907         struct bcm_sysport_priv *priv = netdev_priv(dev);
 908         struct bcm_sysport_tx_ring *txr;
 909         unsigned int ring;
 910
 911         priv->irq1_stat = intrl2_1_readl(priv, INTRL2_CPU_STATUS) &
 912                                 ~intrl2_1_readl(priv, INTRL2_CPU_MASK_STATUS);
 913         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
 914
 915         if (unlikely(priv->irq1_stat == 0)) {
 916                 netdev_warn(priv->netdev, "spurious TX interrupt\n");
 917                 return IRQ_NONE;
 918         }
 919
 920         for (ring = 0; ring < dev->num_tx_queues; ring++) {
 921                 if (!(priv->irq1_stat & BIT(ring)))
 922                         continue;
 923
 924                 txr = &priv->tx_rings[ring];
 925
 926                 if (likely(napi_schedule_prep(&txr->napi))) {
 927                         intrl2_1_mask_set(priv, BIT(ring));
 928                         __napi_schedule(&txr->napi);
 929                 }
 930         }
 931
 932         return IRQ_HANDLED;
 933 }
 934
 935 static irqreturn_t bcm_sysport_wol_isr(int irq, void *dev_id)
 936 {
 937         struct bcm_sysport_priv *priv = dev_id;
 938
 939         pm_wakeup_event(&priv->pdev->dev, 0);
 940
 941         return IRQ_HANDLED;
 942 }
 943
 944 #ifdef CONFIG_NET_POLL_CONTROLLER
 945 static void bcm_sysport_poll_controller(struct net_device *dev)
 946 {
 947         struct bcm_sysport_priv *priv = netdev_priv(dev);
 948
 949         disable_irq(priv->irq0);
 950         bcm_sysport_rx_isr(priv->irq0, priv);
 951         enable_irq(priv->irq0);
 952
 953         disable_irq(priv->irq1);
 954         bcm_sysport_tx_isr(priv->irq1, priv);
 955         enable_irq(priv->irq1);
 956 }
 957 #endif
 958
 959 static struct sk_buff *bcm_sysport_insert_tsb(struct sk_buff *skb,
 960                                               struct net_device *dev)
 961 {
 962         struct sk_buff *nskb;
 963         struct bcm_tsb *tsb;
 964         u32 csum_info;
 965         u8 ip_proto;
 966         u16 csum_start;
 967         u16 ip_ver;
 968
 969         /* Re-allocate SKB if needed */
 970         if (unlikely(skb_headroom(skb) < sizeof(*tsb))) {
 971                 nskb = skb_realloc_headroom(skb, sizeof(*tsb));
 972                 dev_kfree_skb(skb);
 973                 if (!nskb) {
 974                         dev->stats.tx_errors++;
 975                         dev->stats.tx_dropped++;
 976                         return NULL;
 977                 }
 978                 skb = nskb;
 979         }
 980
 981         tsb = (struct bcm_tsb *)skb_push(skb, sizeof(*tsb));
 982         /* Zero-out TSB by default */
 983         memset(tsb, 0, sizeof(*tsb));
 984
 985         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 986                 ip_ver = htons(skb->protocol);
 987                 switch (ip_ver) {
 988                 case ETH_P_IP:
 989                         ip_proto = ip_hdr(skb)->protocol;
 990                         break;
 991                 case ETH_P_IPV6:
 992                         ip_proto = ipv6_hdr(skb)->nexthdr;
 993                         break;
 994                 default:
 995                         return skb;
 996                 }
 997
 998                 /* Get the checksum offset and the L4 (transport) offset */
 999                 csum_start = skb_checksum_start_offset(skb) - sizeof(*tsb);
1000                 csum_info = (csum_start + skb->csum_offset) & L4_CSUM_PTR_MASK;
1001                 csum_info |= (csum_start << L4_PTR_SHIFT);
1002
1003                 if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
1004                         csum_info |= L4_LENGTH_VALID;
1005                         if (ip_proto == IPPROTO_UDP && ip_ver == ETH_P_IP)
1006                                 csum_info |= L4_UDP;
1007                 } else {
1008                         csum_info = 0;
1009                 }
1010
1011                 tsb->l4_ptr_dest_map = csum_info;
1012         }
1013
1014         return skb;
1015 }
1016
1017 static netdev_tx_t bcm_sysport_xmit(struct sk_buff *skb,
1018                                     struct net_device *dev)
1019 {
1020         struct bcm_sysport_priv *priv = netdev_priv(dev);
1021         struct device *kdev = &priv->pdev->dev;
1022         struct bcm_sysport_tx_ring *ring;
1023         struct bcm_sysport_cb *cb;
1024         struct netdev_queue *txq;
1025         struct dma_desc *desc;
1026         unsigned int skb_len;
1027         unsigned long flags;
1028         dma_addr_t mapping;
1029         u32 len_status;
1030         u16 queue;
1031         int ret;
1032
1033         queue = skb_get_queue_mapping(skb);
1034         txq = netdev_get_tx_queue(dev, queue);
1035         ring = &priv->tx_rings[queue];
1036
1037         /* lock against tx reclaim in BH context and TX ring full interrupt */
1038         spin_lock_irqsave(&ring->lock, flags);
1039         if (unlikely(ring->desc_count == 0)) {
1040                 netif_tx_stop_queue(txq);
1041                 netdev_err(dev, "queue %d awake and ring full!\n", queue);
1042                 ret = NETDEV_TX_BUSY;
1043                 goto out;
1044         }
1045
1046         /* The Ethernet switch we are interfaced with needs packets to be at
1047          * least 64 bytes (including FCS) otherwise they will be discarded when
1048          * they enter the switch port logic. When Broadcom tags are enabled, we
1049          * need to make sure that packets are at least 68 bytes
1050          * (including FCS and tag) because the length verification is done after
1051          * the Broadcom tag is stripped off the ingress packet.
1052          */
1053         if (skb_put_padto(skb, ETH_ZLEN + ENET_BRCM_TAG_LEN)) {
1054                 ret = NETDEV_TX_OK;
1055                 goto out;
1056         }
1057
1058         /* Insert TSB and checksum infos */
1059         if (priv->tsb_en) {
1060                 skb = bcm_sysport_insert_tsb(skb, dev);
1061                 if (!skb) {
1062                         ret = NETDEV_TX_OK;
1063                         goto out;
1064                 }
1065         }
1066
1067         skb_len = skb->len;
1068
1069         mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
1070         if (dma_mapping_error(kdev, mapping)) {
1071                 priv->mib.tx_dma_failed++;
1072                 netif_err(priv, tx_err, dev, "DMA map failed at %p (len=%d)\n",
1073                           skb->data, skb_len);
1074                 ret = NETDEV_TX_OK;
1075                 goto out;
1076         }
1077
1078         /* Remember the SKB for future freeing */
1079         cb = &ring->cbs[ring->curr_desc];
1080         cb->skb = skb;
1081         dma_unmap_addr_set(cb, dma_addr, mapping);
1082         dma_unmap_len_set(cb, dma_len, skb_len);
1083
1084         /* Fetch a descriptor entry from our pool */
1085         desc = ring->desc_cpu;
1086
1087         desc->addr_lo = lower_32_bits(mapping);
1088         len_status = upper_32_bits(mapping) & DESC_ADDR_HI_MASK;
1089         len_status |= (skb_len << DESC_LEN_SHIFT);
1090         len_status |= (DESC_SOP | DESC_EOP | TX_STATUS_APP_CRC) <<
1091                        DESC_STATUS_SHIFT;
1092         if (skb->ip_summed == CHECKSUM_PARTIAL)
1093                 len_status |= (DESC_L4_CSUM << DESC_STATUS_SHIFT);
1094
1095         ring->curr_desc++;
1096         if (ring->curr_desc == ring->size)
1097                 ring->curr_desc = 0;
1098         ring->desc_count--;
1099
1100         /* Ensure write completion of the descriptor status/length
1101          * in DRAM before the System Port WRITE_PORT register latches
1102          * the value
1103          */
1104         wmb();
1105         desc->addr_status_len = len_status;
1106         wmb();
1107
1108         /* Write this descriptor address to the RING write port */
1109         tdma_port_write_desc_addr(priv, desc, ring->index);
1110
1111         /* Check ring space and update SW control flow */
1112         if (ring->desc_count == 0)
1113                 netif_tx_stop_queue(txq);
1114
1115         netif_dbg(priv, tx_queued, dev, "ring=%d desc_count=%d, curr_desc=%d\n",
1116                   ring->index, ring->desc_count, ring->curr_desc);
1117
1118         ret = NETDEV_TX_OK;
1119 out:
1120         spin_unlock_irqrestore(&ring->lock, flags);
1121         return ret;
1122 }
1123
1124 static void bcm_sysport_tx_timeout(struct net_device *dev)
1125 {
1126         netdev_warn(dev, "transmit timeout!\n");
1127
1128         dev->trans_start = jiffies;
1129         dev->stats.tx_errors++;
1130
1131         netif_tx_wake_all_queues(dev);
1132 }
1133
1134 /* phylib adjust link callback */
1135 static void bcm_sysport_adj_link(struct net_device *dev)
1136 {
1137         struct bcm_sysport_priv *priv = netdev_priv(dev);
1138         struct phy_device *phydev = priv->phydev;
1139         unsigned int changed = 0;
1140         u32 cmd_bits = 0, reg;
1141
1142         if (priv->old_link != phydev->link) {
1143                 changed = 1;
1144                 priv->old_link = phydev->link;
1145         }
1146
1147         if (priv->old_duplex != phydev->duplex) {
1148                 changed = 1;
1149                 priv->old_duplex = phydev->duplex;
1150         }
1151
1152         switch (phydev->speed) {
1153         case SPEED_2500:
1154                 cmd_bits = CMD_SPEED_2500;
1155                 break;
1156         case SPEED_1000:
1157                 cmd_bits = CMD_SPEED_1000;
1158                 break;
1159         case SPEED_100:
1160                 cmd_bits = CMD_SPEED_100;
1161                 break;
1162         case SPEED_10:
1163                 cmd_bits = CMD_SPEED_10;
1164                 break;
1165         default:
1166                 break;
1167         }
1168         cmd_bits <<= CMD_SPEED_SHIFT;
1169
1170         if (phydev->duplex == DUPLEX_HALF)
1171                 cmd_bits |= CMD_HD_EN;
1172
1173         if (priv->old_pause != phydev->pause) {
1174                 changed = 1;
1175                 priv->old_pause = phydev->pause;
1176         }
1177
1178         if (!phydev->pause)
1179                 cmd_bits |= CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE;
1180
1181         if (!changed)
1182                 return;
1183
1184         if (phydev->link) {
1185                 reg = umac_readl(priv, UMAC_CMD);
1186                 reg &= ~((CMD_SPEED_MASK << CMD_SPEED_SHIFT) |
1187                         CMD_HD_EN | CMD_RX_PAUSE_IGNORE |
1188                         CMD_TX_PAUSE_IGNORE);
1189                 reg |= cmd_bits;
1190                 umac_writel(priv, reg, UMAC_CMD);
1191         }
1192
1193         phy_print_status(priv->phydev);
1194 }
1195
1196 static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,
1197                                     unsigned int index)
1198 {
1199         struct bcm_sysport_tx_ring *ring = &priv->tx_rings[index];
1200         struct device *kdev = &priv->pdev->dev;
1201         size_t size;
1202         void *p;
1203         u32 reg;
1204
1205         /* Simple descriptors partitioning for now */
1206         size = 256;
1207
1208         /* We just need one DMA descriptor which is DMA-able, since writing to
1209          * the port will allocate a new descriptor in its internal linked-list
1210          */
1211         p = dma_zalloc_coherent(kdev, sizeof(struct dma_desc), &ring->desc_dma,
1212                                 GFP_KERNEL);
1213         if (!p) {
1214                 netif_err(priv, hw, priv->netdev, "DMA alloc failed\n");
1215                 return -ENOMEM;
1216         }
1217
1218         ring->cbs = kcalloc(size, sizeof(struct bcm_sysport_cb), GFP_KERNEL);
1219         if (!ring->cbs) {
1220                 netif_err(priv, hw, priv->netdev, "CB allocation failed\n");
1221                 return -ENOMEM;
1222         }
1223
1224         /* Initialize SW view of the ring */
1225         spin_lock_init(&ring->lock);
1226         ring->priv = priv;
1227         netif_napi_add(priv->netdev, &ring->napi, bcm_sysport_tx_poll, 64);
1228         ring->index = index;
1229         ring->size = size;
1230         ring->clean_index = 0;
1231         ring->alloc_size = ring->size;
1232         ring->desc_cpu = p;
1233         ring->desc_count = ring->size;
1234         ring->curr_desc = 0;
1235
1236         /* Initialize HW ring */
1237         tdma_writel(priv, RING_EN, TDMA_DESC_RING_HEAD_TAIL_PTR(index));
1238         tdma_writel(priv, 0, TDMA_DESC_RING_COUNT(index));
1239         tdma_writel(priv, 1, TDMA_DESC_RING_INTR_CONTROL(index));
1240         tdma_writel(priv, 0, TDMA_DESC_RING_PROD_CONS_INDEX(index));
1241         tdma_writel(priv, RING_IGNORE_STATUS, TDMA_DESC_RING_MAPPING(index));
1242         tdma_writel(priv, 0, TDMA_DESC_RING_PCP_DEI_VID(index));
1243
1244         /* Program the number of descriptors as MAX_THRESHOLD and half of
1245          * its size for the hysteresis trigger
1246          */
1247         tdma_writel(priv, ring->size |
1248                         1 << RING_HYST_THRESH_SHIFT,
1249                         TDMA_DESC_RING_MAX_HYST(index));
1250
1251         /* Enable the ring queue in the arbiter */
1252         reg = tdma_readl(priv, TDMA_TIER1_ARB_0_QUEUE_EN);
1253         reg |= (1 << index);
1254         tdma_writel(priv, reg, TDMA_TIER1_ARB_0_QUEUE_EN);
1255
1256         napi_enable(&ring->napi);
1257
1258         netif_dbg(priv, hw, priv->netdev,
1259                   "TDMA cfg, size=%d, desc_cpu=%p\n",
1260                   ring->size, ring->desc_cpu);
1261
1262         return 0;
1263 }
1264
1265 static void bcm_sysport_fini_tx_ring(struct bcm_sysport_priv *priv,
1266                                      unsigned int index)
1267 {
1268         struct bcm_sysport_tx_ring *ring = &priv->tx_rings[index];
1269         struct device *kdev = &priv->pdev->dev;
1270         u32 reg;
1271
1272         /* Caller should stop the TDMA engine */
1273         reg = tdma_readl(priv, TDMA_STATUS);
1274         if (!(reg & TDMA_DISABLED))
1275                 netdev_warn(priv->netdev, "TDMA not stopped!\n");
1276
1277         /* ring->cbs is the last part in bcm_sysport_init_tx_ring which could
1278          * fail, so by checking this pointer we know whether the TX ring was
1279          * fully initialized or not.
1280          */
1281         if (!ring->cbs)
1282                 return;
1283
1284         napi_disable(&ring->napi);
1285         netif_napi_del(&ring->napi);
1286
1287         bcm_sysport_tx_clean(priv, ring);
1288
1289         kfree(ring->cbs);
1290         ring->cbs = NULL;
1291
1292         if (ring->desc_dma) {
1293                 dma_free_coherent(kdev, sizeof(struct dma_desc),
1294                                   ring->desc_cpu, ring->desc_dma);
1295                 ring->desc_dma = 0;
1296         }
1297         ring->size = 0;
1298         ring->alloc_size = 0;
1299
1300         netif_dbg(priv, hw, priv->netdev, "TDMA fini done\n");
1301 }
1302
1303 /* RDMA helper */
1304 static inline int rdma_enable_set(struct bcm_sysport_priv *priv,
1305                                   unsigned int enable)
1306 {
1307         unsigned int timeout = 1000;
1308         u32 reg;
1309
1310         reg = rdma_readl(priv, RDMA_CONTROL);
1311         if (enable)
1312                 reg |= RDMA_EN;
1313         else
1314                 reg &= ~RDMA_EN;
1315         rdma_writel(priv, reg, RDMA_CONTROL);
1316
1317         /* Poll for RMDA disabling completion */
1318         do {
1319                 reg = rdma_readl(priv, RDMA_STATUS);
1320                 if (!!(reg & RDMA_DISABLED) == !enable)
1321                         return 0;
1322                 usleep_range(1000, 2000);
1323         } while (timeout-- > 0);
1324
1325         netdev_err(priv->netdev, "timeout waiting for RDMA to finish\n");
1326
1327         return -ETIMEDOUT;
1328 }
1329
1330 /* TDMA helper */
1331 static inline int tdma_enable_set(struct bcm_sysport_priv *priv,
1332                                   unsigned int enable)
1333 {
1334         unsigned int timeout = 1000;
1335         u32 reg;
1336
1337         reg = tdma_readl(priv, TDMA_CONTROL);
1338         if (enable)
1339                 reg |= TDMA_EN;
1340         else
1341                 reg &= ~TDMA_EN;
1342         tdma_writel(priv, reg, TDMA_CONTROL);
1343
1344         /* Poll for TMDA disabling completion */
1345         do {
1346                 reg = tdma_readl(priv, TDMA_STATUS);
1347                 if (!!(reg & TDMA_DISABLED) == !enable)
1348                         return 0;
1349
1350                 usleep_range(1000, 2000);
1351         } while (timeout-- > 0);
1352
1353         netdev_err(priv->netdev, "timeout waiting for TDMA to finish\n");
1354
1355         return -ETIMEDOUT;
1356 }
1357
1358 static int bcm_sysport_init_rx_ring(struct bcm_sysport_priv *priv)
1359 {
1360         struct bcm_sysport_cb *cb;
1361         u32 reg;
1362         int ret;
1363         int i;
1364
1365         /* Initialize SW view of the RX ring */
1366         priv->num_rx_bds = NUM_RX_DESC;
1367         priv->rx_bds = priv->base + SYS_PORT_RDMA_OFFSET;
1368         priv->rx_c_index = 0;
1369         priv->rx_read_ptr = 0;
1370         priv->rx_cbs = kcalloc(priv->num_rx_bds, sizeof(struct bcm_sysport_cb),
1371                                 GFP_KERNEL);
1372         if (!priv->rx_cbs) {
1373                 netif_err(priv, hw, priv->netdev, "CB allocation failed\n");
1374                 return -ENOMEM;
1375         }
1376
1377         for (i = 0; i < priv->num_rx_bds; i++) {
1378                 cb = priv->rx_cbs + i;
1379                 cb->bd_addr = priv->rx_bds + i * DESC_SIZE;
1380         }
1381
1382         ret = bcm_sysport_alloc_rx_bufs(priv);
1383         if (ret) {
1384                 netif_err(priv, hw, priv->netdev, "SKB allocation failed\n");
1385                 return ret;
1386         }
1387
1388         /* Initialize HW, ensure RDMA is disabled */
1389         reg = rdma_readl(priv, RDMA_STATUS);
1390         if (!(reg & RDMA_DISABLED))
1391                 rdma_enable_set(priv, 0);
1392
1393         rdma_writel(priv, 0, RDMA_WRITE_PTR_LO);
1394         rdma_writel(priv, 0, RDMA_WRITE_PTR_HI);
1395         rdma_writel(priv, 0, RDMA_PROD_INDEX);
1396         rdma_writel(priv, 0, RDMA_CONS_INDEX);
1397         rdma_writel(priv, priv->num_rx_bds << RDMA_RING_SIZE_SHIFT |
1398                           RX_BUF_LENGTH, RDMA_RING_BUF_SIZE);
1399         /* Operate the queue in ring mode */
1400         rdma_writel(priv, 0, RDMA_START_ADDR_HI);
1401         rdma_writel(priv, 0, RDMA_START_ADDR_LO);
1402         rdma_writel(priv, 0, RDMA_END_ADDR_HI);
1403         rdma_writel(priv, NUM_HW_RX_DESC_WORDS - 1, RDMA_END_ADDR_LO);
1404
1405         rdma_writel(priv, 1, RDMA_MBDONE_INTR);
1406
1407         netif_dbg(priv, hw, priv->netdev,
1408                   "RDMA cfg, num_rx_bds=%d, rx_bds=%p\n",
1409                   priv->num_rx_bds, priv->rx_bds);
1410
1411         return 0;
1412 }
1413
1414 static void bcm_sysport_fini_rx_ring(struct bcm_sysport_priv *priv)
1415 {
1416         struct bcm_sysport_cb *cb;
1417         unsigned int i;
1418         u32 reg;
1419
1420         /* Caller should ensure RDMA is disabled */
1421         reg = rdma_readl(priv, RDMA_STATUS);
1422         if (!(reg & RDMA_DISABLED))
1423                 netdev_warn(priv->netdev, "RDMA not stopped!\n");
1424
1425         for (i = 0; i < priv->num_rx_bds; i++) {
1426                 cb = &priv->rx_cbs[i];
1427                 if (dma_unmap_addr(cb, dma_addr))
1428                         dma_unmap_single(&priv->pdev->dev,
1429                                          dma_unmap_addr(cb, dma_addr),
1430                                          RX_BUF_LENGTH, DMA_FROM_DEVICE);
1431                 bcm_sysport_free_cb(cb);
1432         }
1433
1434         kfree(priv->rx_cbs);
1435         priv->rx_cbs = NULL;
1436
1437         netif_dbg(priv, hw, priv->netdev, "RDMA fini done\n");
1438 }
1439
1440 static void bcm_sysport_set_rx_mode(struct net_device *dev)
1441 {
1442         struct bcm_sysport_priv *priv = netdev_priv(dev);
1443         u32 reg;
1444
1445         reg = umac_readl(priv, UMAC_CMD);
1446         if (dev->flags & IFF_PROMISC)
1447                 reg |= CMD_PROMISC;
1448         else
1449                 reg &= ~CMD_PROMISC;
1450         umac_writel(priv, reg, UMAC_CMD);
1451
1452         /* No support for ALLMULTI */
1453         if (dev->flags & IFF_ALLMULTI)
1454                 return;
1455 }
1456
1457 static inline void umac_enable_set(struct bcm_sysport_priv *priv,
1458                                    u32 mask, unsigned int enable)
1459 {
1460         u32 reg;
1461
1462         reg = umac_readl(priv, UMAC_CMD);
1463         if (enable)
1464                 reg |= mask;
1465         else
1466                 reg &= ~mask;
1467         umac_writel(priv, reg, UMAC_CMD);
1468
1469         /* UniMAC stops on a packet boundary, wait for a full-sized packet
1470          * to be processed (1 msec).
1471          */
1472         if (enable == 0)
1473                 usleep_range(1000, 2000);
1474 }
1475
1476 static inline void umac_reset(struct bcm_sysport_priv *priv)
1477 {
1478         u32 reg;
1479
1480         reg = umac_readl(priv, UMAC_CMD);
1481         reg |= CMD_SW_RESET;
1482         umac_writel(priv, reg, UMAC_CMD);
1483         udelay(10);
1484         reg = umac_readl(priv, UMAC_CMD);
1485         reg &= ~CMD_SW_RESET;
1486         umac_writel(priv, reg, UMAC_CMD);
1487 }
1488
1489 static void umac_set_hw_addr(struct bcm_sysport_priv *priv,
1490                              unsigned char *addr)
1491 {
1492         umac_writel(priv, (addr[0] << 24) | (addr[1] << 16) |
1493                         (addr[2] << 8) | addr[3], UMAC_MAC0);
1494         umac_writel(priv, (addr[4] << 8) | addr[5], UMAC_MAC1);
1495 }
1496
1497 static void topctrl_flush(struct bcm_sysport_priv *priv)
1498 {
1499         topctrl_writel(priv, RX_FLUSH, RX_FLUSH_CNTL);
1500         topctrl_writel(priv, TX_FLUSH, TX_FLUSH_CNTL);
1501         mdelay(1);
1502         topctrl_writel(priv, 0, RX_FLUSH_CNTL);
1503         topctrl_writel(priv, 0, TX_FLUSH_CNTL);
1504 }
1505
1506 static int bcm_sysport_change_mac(struct net_device *dev, void *p)
1507 {
1508         struct bcm_sysport_priv *priv = netdev_priv(dev);
1509         struct sockaddr *addr = p;
1510
1511         if (!is_valid_ether_addr(addr->sa_data))
1512                 return -EINVAL;
1513
1514         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1515
1516         /* interface is disabled, changes to MAC will be reflected on next
1517          * open call
1518          */
1519         if (!netif_running(dev))
1520                 return 0;
1521
1522         umac_set_hw_addr(priv, dev->dev_addr);
1523
1524         return 0;
1525 }
1526
1527 static void bcm_sysport_netif_start(struct net_device *dev)
1528 {
1529         struct bcm_sysport_priv *priv = netdev_priv(dev);
1530
1531         /* Enable NAPI */
1532         napi_enable(&priv->napi);
1533
1534         /* Enable RX interrupt and TX ring full interrupt */
1535         intrl2_0_mask_clear(priv, INTRL2_0_RDMA_MBDONE | INTRL2_0_TX_RING_FULL);
1536
1537         phy_start(priv->phydev);
1538
1539         /* Enable TX interrupts for the 32 TXQs */
1540         intrl2_1_mask_clear(priv, 0xffffffff);
1541
1542         /* Last call before we start the real business */
1543         netif_tx_start_all_queues(dev);
1544 }
1545
1546 static void rbuf_init(struct bcm_sysport_priv *priv)
1547 {
1548         u32 reg;
1549
1550         reg = rbuf_readl(priv, RBUF_CONTROL);
1551         reg |= RBUF_4B_ALGN | RBUF_RSB_EN;
1552         rbuf_writel(priv, reg, RBUF_CONTROL);
1553 }
1554
1555 static int bcm_sysport_open(struct net_device *dev)
1556 {
1557         struct bcm_sysport_priv *priv = netdev_priv(dev);
1558         unsigned int i;
1559         int ret;
1560
1561         /* Reset UniMAC */
1562         umac_reset(priv);
1563
1564         /* Flush TX and RX FIFOs at TOPCTRL level */
1565         topctrl_flush(priv);
1566
1567         /* Disable the UniMAC RX/TX */
1568         umac_enable_set(priv, CMD_RX_EN | CMD_TX_EN, 0);
1569
1570         /* Enable RBUF 2bytes alignment and Receive Status Block */
1571         rbuf_init(priv);
1572
1573         /* Set maximum frame length */
1574         umac_writel(priv, UMAC_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
1575
1576         /* Set MAC address */
1577         umac_set_hw_addr(priv, dev->dev_addr);
1578
1579         /* Read CRC forward */
1580         priv->crc_fwd = !!(umac_readl(priv, UMAC_CMD) & CMD_CRC_FWD);
1581
1582         priv->phydev = of_phy_connect(dev, priv->phy_dn, bcm_sysport_adj_link,
1583                                         0, priv->phy_interface);
1584         if (!priv->phydev) {
1585                 netdev_err(dev, "could not attach to PHY\n");
1586                 return -ENODEV;
1587         }
1588
1589         /* Reset house keeping link status */
1590         priv->old_duplex = -1;
1591         priv->old_link = -1;
1592         priv->old_pause = -1;
1593
1594         /* mask all interrupts and request them */
1595         intrl2_0_writel(priv, 0xffffffff, INTRL2_CPU_MASK_SET);
1596         intrl2_0_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1597         intrl2_0_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1598         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_MASK_SET);
1599         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1600         intrl2_1_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1601
1602         ret = request_irq(priv->irq0, bcm_sysport_rx_isr, 0, dev->name, dev);
1603         if (ret) {
1604                 netdev_err(dev, "failed to request RX interrupt\n");
1605                 goto out_phy_disconnect;
1606         }
1607
1608         ret = request_irq(priv->irq1, bcm_sysport_tx_isr, 0, dev->name, dev);
1609         if (ret) {
1610                 netdev_err(dev, "failed to request TX interrupt\n");
1611                 goto out_free_irq0;
1612         }
1613
1614         /* Initialize both hardware and software ring */
1615         spin_lock_init(&priv->desc_lock);
1616         for (i = 0; i < dev->num_tx_queues; i++) {
1617                 ret = bcm_sysport_init_tx_ring(priv, i);
1618                 if (ret) {
1619                         netdev_err(dev, "failed to initialize TX ring %d\n",
1620                                    i);
1621                         goto out_free_tx_ring;
1622                 }
1623         }
1624
1625         /* Initialize linked-list */
1626         tdma_writel(priv, TDMA_LL_RAM_INIT_BUSY, TDMA_STATUS);
1627
1628         /* Initialize RX ring */
1629         ret = bcm_sysport_init_rx_ring(priv);
1630         if (ret) {
1631                 netdev_err(dev, "failed to initialize RX ring\n");
1632                 goto out_free_rx_ring;
1633         }
1634
1635         /* Turn on RDMA */
1636         ret = rdma_enable_set(priv, 1);
1637         if (ret)
1638                 goto out_free_rx_ring;
1639
1640         /* Turn on TDMA */
1641         ret = tdma_enable_set(priv, 1);
1642         if (ret)
1643                 goto out_clear_rx_int;
1644
1645         /* Turn on UniMAC TX/RX */
1646         umac_enable_set(priv, CMD_RX_EN | CMD_TX_EN, 1);
1647
1648         bcm_sysport_netif_start(dev);
1649
1650         return 0;
1651
1652 out_clear_rx_int:
1653         intrl2_0_mask_set(priv, INTRL2_0_RDMA_MBDONE | INTRL2_0_TX_RING_FULL);
1654 out_free_rx_ring:
1655         bcm_sysport_fini_rx_ring(priv);
1656 out_free_tx_ring:
1657         for (i = 0; i < dev->num_tx_queues; i++)
1658                 bcm_sysport_fini_tx_ring(priv, i);
1659         free_irq(priv->irq1, dev);
1660 out_free_irq0:
1661         free_irq(priv->irq0, dev);
1662 out_phy_disconnect:
1663         phy_disconnect(priv->phydev);
1664         return ret;
1665 }
1666
1667 static void bcm_sysport_netif_stop(struct net_device *dev)
1668 {
1669         struct bcm_sysport_priv *priv = netdev_priv(dev);
1670
1671         /* stop all software from updating hardware */
1672         netif_tx_stop_all_queues(dev);
1673         napi_disable(&priv->napi);
1674         phy_stop(priv->phydev);
1675
1676         /* mask all interrupts */
1677         intrl2_0_mask_set(priv, 0xffffffff);
1678         intrl2_0_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1679         intrl2_1_mask_set(priv, 0xffffffff);
1680         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1681 }
1682
1683 static int bcm_sysport_stop(struct net_device *dev)
1684 {
1685         struct bcm_sysport_priv *priv = netdev_priv(dev);
1686         unsigned int i;
1687         int ret;
1688
1689         bcm_sysport_netif_stop(dev);
1690
1691         /* Disable UniMAC RX */
1692         umac_enable_set(priv, CMD_RX_EN, 0);
1693
1694         ret = tdma_enable_set(priv, 0);
1695         if (ret) {
1696                 netdev_err(dev, "timeout disabling RDMA\n");
1697                 return ret;
1698         }
1699
1700         /* Wait for a maximum packet size to be drained */
1701         usleep_range(2000, 3000);
1702
1703         ret = rdma_enable_set(priv, 0);
1704         if (ret) {
1705                 netdev_err(dev, "timeout disabling TDMA\n");
1706                 return ret;
1707         }
1708
1709         /* Disable UniMAC TX */
1710         umac_enable_set(priv, CMD_TX_EN, 0);
1711
1712         /* Free RX/TX rings SW structures */
1713         for (i = 0; i < dev->num_tx_queues; i++)
1714                 bcm_sysport_fini_tx_ring(priv, i);
1715         bcm_sysport_fini_rx_ring(priv);
1716
1717         free_irq(priv->irq0, dev);
1718         free_irq(priv->irq1, dev);
1719
1720         /* Disconnect from PHY */
1721         phy_disconnect(priv->phydev);
1722
1723         return 0;
1724 }
1725
1726 static struct ethtool_ops bcm_sysport_ethtool_ops = {
1727         .get_settings           = bcm_sysport_get_settings,
1728         .set_settings           = bcm_sysport_set_settings,
1729         .get_drvinfo            = bcm_sysport_get_drvinfo,
1730         .get_msglevel           = bcm_sysport_get_msglvl,
1731         .set_msglevel           = bcm_sysport_set_msglvl,
1732         .get_link               = ethtool_op_get_link,
1733         .get_strings            = bcm_sysport_get_strings,
1734         .get_ethtool_stats      = bcm_sysport_get_stats,
1735         .get_sset_count         = bcm_sysport_get_sset_count,
1736         .get_wol                = bcm_sysport_get_wol,
1737         .set_wol                = bcm_sysport_set_wol,
1738         .get_coalesce           = bcm_sysport_get_coalesce,
1739         .set_coalesce           = bcm_sysport_set_coalesce,
1740 };
1741
1742 static const struct net_device_ops bcm_sysport_netdev_ops = {
1743         .ndo_start_xmit         = bcm_sysport_xmit,
1744         .ndo_tx_timeout         = bcm_sysport_tx_timeout,
1745         .ndo_open               = bcm_sysport_open,
1746         .ndo_stop               = bcm_sysport_stop,
1747         .ndo_set_features       = bcm_sysport_set_features,
1748         .ndo_set_rx_mode        = bcm_sysport_set_rx_mode,
1749         .ndo_set_mac_address    = bcm_sysport_change_mac,
1750 #ifdef CONFIG_NET_POLL_CONTROLLER
1751         .ndo_poll_controller    = bcm_sysport_poll_controller,
1752 #endif
1753 };
1754
1755 #define REV_FMT "v%2x.%02x"
1756
1757 static int bcm_sysport_probe(struct platform_device *pdev)
1758 {
1759         struct bcm_sysport_priv *priv;
1760         struct device_node *dn;
1761         struct net_device *dev;
1762         const void *macaddr;
1763         struct resource *r;
1764         u32 txq, rxq;
1765         int ret;
1766
1767         dn = pdev->dev.of_node;
1768         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1769
1770         /* Read the Transmit/Receive Queue properties */
1771         if (of_property_read_u32(dn, "systemport,num-txq", &txq))
1772                 txq = TDMA_NUM_RINGS;
1773         if (of_property_read_u32(dn, "systemport,num-rxq", &rxq))
1774                 rxq = 1;
1775
1776         dev = alloc_etherdev_mqs(sizeof(*priv), txq, rxq);
1777         if (!dev)
1778                 return -ENOMEM;
1779
1780         /* Initialize private members */
1781         priv = netdev_priv(dev);
1782
1783         priv->irq0 = platform_get_irq(pdev, 0);
1784         priv->irq1 = platform_get_irq(pdev, 1);
1785         priv->wol_irq = platform_get_irq(pdev, 2);
1786         if (priv->irq0 <= 0 || priv->irq1 <= 0) {
1787                 dev_err(&pdev->dev, "invalid interrupts\n");
1788                 ret = -EINVAL;
1789                 goto err;
1790         }
1791
1792         priv->base = devm_ioremap_resource(&pdev->dev, r);
1793         if (IS_ERR(priv->base)) {
1794                 ret = PTR_ERR(priv->base);
1795                 goto err;
1796         }
1797
1798         priv->netdev = dev;
1799         priv->pdev = pdev;
1800
1801         priv->phy_interface = of_get_phy_mode(dn);
1802         /* Default to GMII interface mode */
1803         if ((int)priv->phy_interface < 0)
1804                 priv->phy_interface = PHY_INTERFACE_MODE_GMII;
1805
1806         /* In the case of a fixed PHY, the DT node associated
1807          * to the PHY is the Ethernet MAC DT node.
1808          */
1809         if (of_phy_is_fixed_link(dn)) {
1810                 ret = of_phy_register_fixed_link(dn);
1811                 if (ret) {
1812                         dev_err(&pdev->dev, "failed to register fixed PHY\n");
1813                         goto err;
1814                 }
1815
1816                 priv->phy_dn = dn;
1817         }
1818
1819         /* Initialize netdevice members */
1820         macaddr = of_get_mac_address(dn);
1821         if (!macaddr || !is_valid_ether_addr(macaddr)) {
1822                 dev_warn(&pdev->dev, "using random Ethernet MAC\n");
1823                 eth_hw_addr_random(dev);
1824         } else {
1825                 ether_addr_copy(dev->dev_addr, macaddr);
1826         }
1827
1828         SET_NETDEV_DEV(dev, &pdev->dev);
1829         dev_set_drvdata(&pdev->dev, dev);
1830         dev->ethtool_ops = &bcm_sysport_ethtool_ops;
1831         dev->netdev_ops = &bcm_sysport_netdev_ops;
1832         netif_napi_add(dev, &priv->napi, bcm_sysport_poll, 64);
1833
1834         /* HW supported features, none enabled by default */
1835         dev->hw_features |= NETIF_F_RXCSUM | NETIF_F_HIGHDMA |
1836                                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1837
1838         /* Request the WOL interrupt and advertise suspend if available */
1839         priv->wol_irq_disabled = 1;
1840         ret = devm_request_irq(&pdev->dev, priv->wol_irq,
1841                                bcm_sysport_wol_isr, 0, dev->name, priv);
1842         if (!ret)
1843                 device_set_wakeup_capable(&pdev->dev, 1);
1844
1845         /* Set the needed headroom once and for all */
1846         BUILD_BUG_ON(sizeof(struct bcm_tsb) != 8);
1847         dev->needed_headroom += sizeof(struct bcm_tsb);
1848
1849         /* libphy will adjust the link state accordingly */
1850         netif_carrier_off(dev);
1851
1852         ret = register_netdev(dev);
1853         if (ret) {
1854                 dev_err(&pdev->dev, "failed to register net_device\n");
1855                 goto err;
1856         }
1857
1858         priv->rev = topctrl_readl(priv, REV_CNTL) & REV_MASK;
1859         dev_info(&pdev->dev,
1860                  "Broadcom SYSTEMPORT" REV_FMT
1861                  " at 0x%p (irqs: %d, %d, TXQs: %d, RXQs: %d)\n",
1862                  (priv->rev >> 8) & 0xff, priv->rev & 0xff,
1863                  priv->base, priv->irq0, priv->irq1, txq, rxq);
1864
1865         return 0;
1866 err:
1867         free_netdev(dev);
1868         return ret;
1869 }
1870
1871 static int bcm_sysport_remove(struct platform_device *pdev)
1872 {
1873         struct net_device *dev = dev_get_drvdata(&pdev->dev);
1874
1875         /* Not much to do, ndo_close has been called
1876          * and we use managed allocations
1877          */
1878         unregister_netdev(dev);
1879         free_netdev(dev);
1880         dev_set_drvdata(&pdev->dev, NULL);
1881
1882         return 0;
1883 }
1884
1885 #ifdef CONFIG_PM_SLEEP
1886 static int bcm_sysport_suspend_to_wol(struct bcm_sysport_priv *priv)
1887 {
1888         struct net_device *ndev = priv->netdev;
1889         unsigned int timeout = 1000;
1890         u32 reg;
1891
1892         reg = umac_readl(priv, UMAC_MPD_CTRL);
1893         reg |= MPD_EN;
1894         reg &= ~PSW_EN;
1895         if (priv->wolopts & WAKE_MAGICSECURE) {
1896                 /* Program the SecureOn password */
1897                 umac_writel(priv, get_unaligned_be16(&priv->sopass[0]),
1898                             UMAC_PSW_MS);
1899                 umac_writel(priv, get_unaligned_be32(&priv->sopass[2]),
1900                             UMAC_PSW_LS);
1901                 reg |= PSW_EN;
1902         }
1903         umac_writel(priv, reg, UMAC_MPD_CTRL);
1904
1905         /* Make sure RBUF entered WoL mode as result */
1906         do {
1907                 reg = rbuf_readl(priv, RBUF_STATUS);
1908                 if (reg & RBUF_WOL_MODE)
1909                         break;
1910
1911                 udelay(10);
1912         } while (timeout-- > 0);
1913
1914         /* Do not leave the UniMAC RBUF matching only MPD packets */
1915         if (!timeout) {
1916                 reg = umac_readl(priv, UMAC_MPD_CTRL);
1917                 reg &= ~MPD_EN;
1918                 umac_writel(priv, reg, UMAC_MPD_CTRL);
1919                 netif_err(priv, wol, ndev, "failed to enter WOL mode\n");
1920                 return -ETIMEDOUT;
1921         }
1922
1923         /* UniMAC receive needs to be turned on */
1924         umac_enable_set(priv, CMD_RX_EN, 1);
1925
1926         netif_dbg(priv, wol, ndev, "entered WOL mode\n");
1927
1928         return 0;
1929 }
1930
1931 static int bcm_sysport_suspend(struct device *d)
1932 {
1933         struct net_device *dev = dev_get_drvdata(d);
1934         struct bcm_sysport_priv *priv = netdev_priv(dev);
1935         unsigned int i;
1936         int ret = 0;
1937         u32 reg;
1938
1939         if (!netif_running(dev))
1940                 return 0;
1941
1942         bcm_sysport_netif_stop(dev);
1943
1944         phy_suspend(priv->phydev);
1945
1946         netif_device_detach(dev);
1947
1948         /* Disable UniMAC RX */
1949         umac_enable_set(priv, CMD_RX_EN, 0);
1950
1951         ret = rdma_enable_set(priv, 0);
1952         if (ret) {
1953                 netdev_err(dev, "RDMA timeout!\n");
1954                 return ret;
1955         }
1956
1957         /* Disable RXCHK if enabled */
1958         if (priv->rx_chk_en) {
1959                 reg = rxchk_readl(priv, RXCHK_CONTROL);
1960                 reg &= ~RXCHK_EN;
1961                 rxchk_writel(priv, reg, RXCHK_CONTROL);
1962         }
1963
1964         /* Flush RX pipe */
1965         if (!priv->wolopts)
1966                 topctrl_writel(priv, RX_FLUSH, RX_FLUSH_CNTL);
1967
1968         ret = tdma_enable_set(priv, 0);
1969         if (ret) {
1970                 netdev_err(dev, "TDMA timeout!\n");
1971                 return ret;
1972         }
1973
1974         /* Wait for a packet boundary */
1975         usleep_range(2000, 3000);
1976
1977         umac_enable_set(priv, CMD_TX_EN, 0);
1978
1979         topctrl_writel(priv, TX_FLUSH, TX_FLUSH_CNTL);
1980
1981         /* Free RX/TX rings SW structures */
1982         for (i = 0; i < dev->num_tx_queues; i++)
1983                 bcm_sysport_fini_tx_ring(priv, i);
1984         bcm_sysport_fini_rx_ring(priv);
1985
1986         /* Get prepared for Wake-on-LAN */
1987         if (device_may_wakeup(d) && priv->wolopts)
1988                 ret = bcm_sysport_suspend_to_wol(priv);
1989
1990         return ret;
1991 }
1992
1993 static int bcm_sysport_resume(struct device *d)
1994 {
1995         struct net_device *dev = dev_get_drvdata(d);
1996         struct bcm_sysport_priv *priv = netdev_priv(dev);
1997         unsigned int i;
1998         u32 reg;
1999         int ret;
2000
2001         if (!netif_running(dev))
2002                 return 0;
2003
2004         umac_reset(priv);
2005
2006         /* Disable the UniMAC RX/TX */
2007         umac_enable_set(priv, CMD_RX_EN | CMD_TX_EN, 0);
2008
2009         /* We may have been suspended and never received a WOL event that
2010          * would turn off MPD detection, take care of that now
2011          */
2012         bcm_sysport_resume_from_wol(priv);
2013
2014         /* Initialize both hardware and software ring */
2015         for (i = 0; i < dev->num_tx_queues; i++) {
2016                 ret = bcm_sysport_init_tx_ring(priv, i);
2017                 if (ret) {
2018                         netdev_err(dev, "failed to initialize TX ring %d\n",
2019                                    i);
2020                         goto out_free_tx_rings;
2021                 }
2022         }
2023
2024         /* Initialize linked-list */
2025         tdma_writel(priv, TDMA_LL_RAM_INIT_BUSY, TDMA_STATUS);
2026
2027         /* Initialize RX ring */
2028         ret = bcm_sysport_init_rx_ring(priv);
2029         if (ret) {
2030                 netdev_err(dev, "failed to initialize RX ring\n");
2031                 goto out_free_rx_ring;
2032         }
2033
2034         netif_device_attach(dev);
2035
2036         /* RX pipe enable */
2037         topctrl_writel(priv, 0, RX_FLUSH_CNTL);
2038
2039         ret = rdma_enable_set(priv, 1);
2040         if (ret) {
2041                 netdev_err(dev, "failed to enable RDMA\n");
2042                 goto out_free_rx_ring;
2043         }
2044
2045         /* Enable rxhck */
2046         if (priv->rx_chk_en) {
2047                 reg = rxchk_readl(priv, RXCHK_CONTROL);
2048                 reg |= RXCHK_EN;
2049                 rxchk_writel(priv, reg, RXCHK_CONTROL);
2050         }
2051
2052         rbuf_init(priv);
2053
2054         /* Set maximum frame length */
2055         umac_writel(priv, UMAC_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
2056
2057         /* Set MAC address */
2058         umac_set_hw_addr(priv, dev->dev_addr);
2059
2060         umac_enable_set(priv, CMD_RX_EN, 1);
2061
2062         /* TX pipe enable */
2063         topctrl_writel(priv, 0, TX_FLUSH_CNTL);
2064
2065         umac_enable_set(priv, CMD_TX_EN, 1);
2066
2067         ret = tdma_enable_set(priv, 1);
2068         if (ret) {
2069                 netdev_err(dev, "TDMA timeout!\n");
2070                 goto out_free_rx_ring;
2071         }
2072
2073         phy_resume(priv->phydev);
2074
2075         bcm_sysport_netif_start(dev);
2076
2077         return 0;
2078
2079 out_free_rx_ring:
2080         bcm_sysport_fini_rx_ring(priv);
2081 out_free_tx_rings:
2082         for (i = 0; i < dev->num_tx_queues; i++)
2083                 bcm_sysport_fini_tx_ring(priv, i);
2084         return ret;
2085 }
2086 #endif
2087
2088 static SIMPLE_DEV_PM_OPS(bcm_sysport_pm_ops,
2089                 bcm_sysport_suspend, bcm_sysport_resume);
2090
2091 static const struct of_device_id bcm_sysport_of_match[] = {
2092         { .compatible = "brcm,systemport-v1.00" },
2093         { .compatible = "brcm,systemport" },
2094         { /* sentinel */ }
2095 };
2096 MODULE_DEVICE_TABLE(of, bcm_sysport_of_match);
2097
2098 static struct platform_driver bcm_sysport_driver = {
2099         .probe  = bcm_sysport_probe,
2100         .remove = bcm_sysport_remove,
2101         .driver =  {
2102                 .name = "brcm-systemport",
2103                 .of_match_table = bcm_sysport_of_match,
2104                 .pm = &bcm_sysport_pm_ops,
2105         },
2106 };
2107 module_platform_driver(bcm_sysport_driver);
2108
2109 MODULE_AUTHOR("Broadcom Corporation");
2110 MODULE_DESCRIPTION("Broadcom System Port Ethernet MAC driver");
2111 MODULE_ALIAS("platform:brcm-systemport");
2112 MODULE_LICENSE("GPL");