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         STAT_MIB_SOFT("alloc_rx_buff_failed", mib.alloc_rx_buff_failed),
 278         STAT_MIB_SOFT("rx_dma_failed", mib.rx_dma_failed),
 279         STAT_MIB_SOFT("tx_dma_failed", mib.tx_dma_failed),
 280 };
 281
 282 #define BCM_SYSPORT_STATS_LEN   ARRAY_SIZE(bcm_sysport_gstrings_stats)
 283
 284 static void bcm_sysport_get_drvinfo(struct net_device *dev,
 285                                     struct ethtool_drvinfo *info)
 286 {
 287         strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
 288         strlcpy(info->version, "0.1", sizeof(info->version));
 289         strlcpy(info->bus_info, "platform", sizeof(info->bus_info));
 290         info->n_stats = BCM_SYSPORT_STATS_LEN;
 291 }
 292
 293 static u32 bcm_sysport_get_msglvl(struct net_device *dev)
 294 {
 295         struct bcm_sysport_priv *priv = netdev_priv(dev);
 296
 297         return priv->msg_enable;
 298 }
 299
 300 static void bcm_sysport_set_msglvl(struct net_device *dev, u32 enable)
 301 {
 302         struct bcm_sysport_priv *priv = netdev_priv(dev);
 303
 304         priv->msg_enable = enable;
 305 }
 306
 307 static int bcm_sysport_get_sset_count(struct net_device *dev, int string_set)
 308 {
 309         switch (string_set) {
 310         case ETH_SS_STATS:
 311                 return BCM_SYSPORT_STATS_LEN;
 312         default:
 313                 return -EOPNOTSUPP;
 314         }
 315 }
 316
 317 static void bcm_sysport_get_strings(struct net_device *dev,
 318                                     u32 stringset, u8 *data)
 319 {
 320         int i;
 321
 322         switch (stringset) {
 323         case ETH_SS_STATS:
 324                 for (i = 0; i < BCM_SYSPORT_STATS_LEN; i++) {
 325                         memcpy(data + i * ETH_GSTRING_LEN,
 326                                bcm_sysport_gstrings_stats[i].stat_string,
 327                                ETH_GSTRING_LEN);
 328                 }
 329                 break;
 330         default:
 331                 break;
 332         }
 333 }
 334
 335 static void bcm_sysport_update_mib_counters(struct bcm_sysport_priv *priv)
 336 {
 337         int i, j = 0;
 338
 339         for (i = 0; i < BCM_SYSPORT_STATS_LEN; i++) {
 340                 const struct bcm_sysport_stats *s;
 341                 u8 offset = 0;
 342                 u32 val = 0;
 343                 char *p;
 344
 345                 s = &bcm_sysport_gstrings_stats[i];
 346                 switch (s->type) {
 347                 case BCM_SYSPORT_STAT_NETDEV:
 348                 case BCM_SYSPORT_STAT_SOFT:
 349                         continue;
 350                 case BCM_SYSPORT_STAT_MIB_RX:
 351                 case BCM_SYSPORT_STAT_MIB_TX:
 352                 case BCM_SYSPORT_STAT_RUNT:
 353                         if (s->type != BCM_SYSPORT_STAT_MIB_RX)
 354                                 offset = UMAC_MIB_STAT_OFFSET;
 355                         val = umac_readl(priv, UMAC_MIB_START + j + offset);
 356                         break;
 357                 case BCM_SYSPORT_STAT_RXCHK:
 358                         val = rxchk_readl(priv, s->reg_offset);
 359                         if (val == ~0)
 360                                 rxchk_writel(priv, 0, s->reg_offset);
 361                         break;
 362                 case BCM_SYSPORT_STAT_RBUF:
 363                         val = rbuf_readl(priv, s->reg_offset);
 364                         if (val == ~0)
 365                                 rbuf_writel(priv, 0, s->reg_offset);
 366                         break;
 367                 }
 368
 369                 j += s->stat_sizeof;
 370                 p = (char *)priv + s->stat_offset;
 371                 *(u32 *)p = val;
 372         }
 373
 374         netif_dbg(priv, hw, priv->netdev, "updated MIB counters\n");
 375 }
 376
 377 static void bcm_sysport_get_stats(struct net_device *dev,
 378                                   struct ethtool_stats *stats, u64 *data)
 379 {
 380         struct bcm_sysport_priv *priv = netdev_priv(dev);
 381         int i;
 382
 383         if (netif_running(dev))
 384                 bcm_sysport_update_mib_counters(priv);
 385
 386         for (i =  0; i < BCM_SYSPORT_STATS_LEN; i++) {
 387                 const struct bcm_sysport_stats *s;
 388                 char *p;
 389
 390                 s = &bcm_sysport_gstrings_stats[i];
 391                 if (s->type == BCM_SYSPORT_STAT_NETDEV)
 392                         p = (char *)&dev->stats;
 393                 else
 394                         p = (char *)priv;
 395                 p += s->stat_offset;
 396                 data[i] = *(u32 *)p;
 397         }
 398 }
 399
 400 static void bcm_sysport_get_wol(struct net_device *dev,
 401                                 struct ethtool_wolinfo *wol)
 402 {
 403         struct bcm_sysport_priv *priv = netdev_priv(dev);
 404         u32 reg;
 405
 406         wol->supported = WAKE_MAGIC | WAKE_MAGICSECURE;
 407         wol->wolopts = priv->wolopts;
 408
 409         if (!(priv->wolopts & WAKE_MAGICSECURE))
 410                 return;
 411
 412         /* Return the programmed SecureOn password */
 413         reg = umac_readl(priv, UMAC_PSW_MS);
 414         put_unaligned_be16(reg, &wol->sopass[0]);
 415         reg = umac_readl(priv, UMAC_PSW_LS);
 416         put_unaligned_be32(reg, &wol->sopass[2]);
 417 }
 418
 419 static int bcm_sysport_set_wol(struct net_device *dev,
 420                                struct ethtool_wolinfo *wol)
 421 {
 422         struct bcm_sysport_priv *priv = netdev_priv(dev);
 423         struct device *kdev = &priv->pdev->dev;
 424         u32 supported = WAKE_MAGIC | WAKE_MAGICSECURE;
 425
 426         if (!device_can_wakeup(kdev))
 427                 return -ENOTSUPP;
 428
 429         if (wol->wolopts & ~supported)
 430                 return -EINVAL;
 431
 432         /* Program the SecureOn password */
 433         if (wol->wolopts & WAKE_MAGICSECURE) {
 434                 umac_writel(priv, get_unaligned_be16(&wol->sopass[0]),
 435                             UMAC_PSW_MS);
 436                 umac_writel(priv, get_unaligned_be32(&wol->sopass[2]),
 437                             UMAC_PSW_LS);
 438         }
 439
 440         /* Flag the device and relevant IRQ as wakeup capable */
 441         if (wol->wolopts) {
 442                 device_set_wakeup_enable(kdev, 1);
 443                 if (priv->wol_irq_disabled)
 444                         enable_irq_wake(priv->wol_irq);
 445                 priv->wol_irq_disabled = 0;
 446         } else {
 447                 device_set_wakeup_enable(kdev, 0);
 448                 /* Avoid unbalanced disable_irq_wake calls */
 449                 if (!priv->wol_irq_disabled)
 450                         disable_irq_wake(priv->wol_irq);
 451                 priv->wol_irq_disabled = 1;
 452         }
 453
 454         priv->wolopts = wol->wolopts;
 455
 456         return 0;
 457 }
 458
 459 static int bcm_sysport_get_coalesce(struct net_device *dev,
 460                                     struct ethtool_coalesce *ec)
 461 {
 462         struct bcm_sysport_priv *priv = netdev_priv(dev);
 463         u32 reg;
 464
 465         reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(0));
 466
 467         ec->tx_coalesce_usecs = (reg >> RING_TIMEOUT_SHIFT) * 8192 / 1000;
 468         ec->tx_max_coalesced_frames = reg & RING_INTR_THRESH_MASK;
 469
 470         reg = rdma_readl(priv, RDMA_MBDONE_INTR);
 471
 472         ec->rx_coalesce_usecs = (reg >> RDMA_TIMEOUT_SHIFT) * 8192 / 1000;
 473         ec->rx_max_coalesced_frames = reg & RDMA_INTR_THRESH_MASK;
 474
 475         return 0;
 476 }
 477
 478 static int bcm_sysport_set_coalesce(struct net_device *dev,
 479                                     struct ethtool_coalesce *ec)
 480 {
 481         struct bcm_sysport_priv *priv = netdev_priv(dev);
 482         unsigned int i;
 483         u32 reg;
 484
 485         /* Base system clock is 125Mhz, DMA timeout is this reference clock
 486          * divided by 1024, which yield roughly 8.192 us, our maximum value has
 487          * to fit in the RING_TIMEOUT_MASK (16 bits).
 488          */
 489         if (ec->tx_max_coalesced_frames > RING_INTR_THRESH_MASK ||
 490             ec->tx_coalesce_usecs > (RING_TIMEOUT_MASK * 8) + 1 ||
 491             ec->rx_max_coalesced_frames > RDMA_INTR_THRESH_MASK ||
 492             ec->rx_coalesce_usecs > (RDMA_TIMEOUT_MASK * 8) + 1)
 493                 return -EINVAL;
 494
 495         if ((ec->tx_coalesce_usecs == 0 && ec->tx_max_coalesced_frames == 0) ||
 496             (ec->rx_coalesce_usecs == 0 && ec->rx_max_coalesced_frames == 0))
 497                 return -EINVAL;
 498
 499         for (i = 0; i < dev->num_tx_queues; i++) {
 500                 reg = tdma_readl(priv, TDMA_DESC_RING_INTR_CONTROL(i));
 501                 reg &= ~(RING_INTR_THRESH_MASK |
 502                          RING_TIMEOUT_MASK << RING_TIMEOUT_SHIFT);
 503                 reg |= ec->tx_max_coalesced_frames;
 504                 reg |= DIV_ROUND_UP(ec->tx_coalesce_usecs * 1000, 8192) <<
 505                          RING_TIMEOUT_SHIFT;
 506                 tdma_writel(priv, reg, TDMA_DESC_RING_INTR_CONTROL(i));
 507         }
 508
 509         reg = rdma_readl(priv, RDMA_MBDONE_INTR);
 510         reg &= ~(RDMA_INTR_THRESH_MASK |
 511                  RDMA_TIMEOUT_MASK << RDMA_TIMEOUT_SHIFT);
 512         reg |= ec->rx_max_coalesced_frames;
 513         reg |= DIV_ROUND_UP(ec->rx_coalesce_usecs * 1000, 8192) <<
 514                             RDMA_TIMEOUT_SHIFT;
 515         rdma_writel(priv, reg, RDMA_MBDONE_INTR);
 516
 517         return 0;
 518 }
 519
 520 static void bcm_sysport_free_cb(struct bcm_sysport_cb *cb)
 521 {
 522         dev_kfree_skb_any(cb->skb);
 523         cb->skb = NULL;
 524         dma_unmap_addr_set(cb, dma_addr, 0);
 525 }
 526
 527 static struct sk_buff *bcm_sysport_rx_refill(struct bcm_sysport_priv *priv,
 528                                              struct bcm_sysport_cb *cb)
 529 {
 530         struct device *kdev = &priv->pdev->dev;
 531         struct net_device *ndev = priv->netdev;
 532         struct sk_buff *skb, *rx_skb;
 533         dma_addr_t mapping;
 534
 535         /* Allocate a new SKB for a new packet */
 536         skb = netdev_alloc_skb(priv->netdev, RX_BUF_LENGTH);
 537         if (!skb) {
 538                 priv->mib.alloc_rx_buff_failed++;
 539                 netif_err(priv, rx_err, ndev, "SKB alloc failed\n");
 540                 return NULL;
 541         }
 542
 543         mapping = dma_map_single(kdev, skb->data,
 544                                  RX_BUF_LENGTH, DMA_FROM_DEVICE);
 545         if (dma_mapping_error(kdev, mapping)) {
 546                 priv->mib.rx_dma_failed++;
 547                 dev_kfree_skb_any(skb);
 548                 netif_err(priv, rx_err, ndev, "DMA mapping failure\n");
 549                 return NULL;
 550         }
 551
 552         /* Grab the current SKB on the ring */
 553         rx_skb = cb->skb;
 554         if (likely(rx_skb))
 555                 dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
 556                                  RX_BUF_LENGTH, DMA_FROM_DEVICE);
 557
 558         /* Put the new SKB on the ring */
 559         cb->skb = skb;
 560         dma_unmap_addr_set(cb, dma_addr, mapping);
 561         dma_desc_set_addr(priv, cb->bd_addr, mapping);
 562
 563         netif_dbg(priv, rx_status, ndev, "RX refill\n");
 564
 565         /* Return the current SKB to the caller */
 566         return rx_skb;
 567 }
 568
 569 static int bcm_sysport_alloc_rx_bufs(struct bcm_sysport_priv *priv)
 570 {
 571         struct bcm_sysport_cb *cb;
 572         struct sk_buff *skb;
 573         unsigned int i;
 574
 575         for (i = 0; i < priv->num_rx_bds; i++) {
 576                 cb = &priv->rx_cbs[i];
 577                 skb = bcm_sysport_rx_refill(priv, cb);
 578                 if (skb)
 579                         dev_kfree_skb(skb);
 580                 if (!cb->skb)
 581                         return -ENOMEM;
 582         }
 583
 584         return 0;
 585 }
 586
 587 /* Poll the hardware for up to budget packets to process */
 588 static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
 589                                         unsigned int budget)
 590 {
 591         struct net_device *ndev = priv->netdev;
 592         unsigned int processed = 0, to_process;
 593         struct bcm_sysport_cb *cb;
 594         struct sk_buff *skb;
 595         unsigned int p_index;
 596         u16 len, status;
 597         struct bcm_rsb *rsb;
 598
 599         /* Determine how much we should process since last call */
 600         p_index = rdma_readl(priv, RDMA_PROD_INDEX);
 601         p_index &= RDMA_PROD_INDEX_MASK;
 602
 603         if (p_index < priv->rx_c_index)
 604                 to_process = (RDMA_CONS_INDEX_MASK + 1) -
 605                         priv->rx_c_index + p_index;
 606         else
 607                 to_process = p_index - priv->rx_c_index;
 608
 609         netif_dbg(priv, rx_status, ndev,
 610                   "p_index=%d rx_c_index=%d to_process=%d\n",
 611                   p_index, priv->rx_c_index, to_process);
 612
 613         while ((processed < to_process) && (processed < budget)) {
 614                 cb = &priv->rx_cbs[priv->rx_read_ptr];
 615                 skb = bcm_sysport_rx_refill(priv, cb);
 616
 617
 618                 /* We do not have a backing SKB, so we do not a corresponding
 619                  * DMA mapping for this incoming packet since
 620                  * bcm_sysport_rx_refill always either has both skb and mapping
 621                  * or none.
 622                  */
 623                 if (unlikely(!skb)) {
 624                         netif_err(priv, rx_err, ndev, "out of memory!\n");
 625                         ndev->stats.rx_dropped++;
 626                         ndev->stats.rx_errors++;
 627                         goto next;
 628                 }
 629
 630                 /* Extract the Receive Status Block prepended */
 631                 rsb = (struct bcm_rsb *)skb->data;
 632                 len = (rsb->rx_status_len >> DESC_LEN_SHIFT) & DESC_LEN_MASK;
 633                 status = (rsb->rx_status_len >> DESC_STATUS_SHIFT) &
 634                           DESC_STATUS_MASK;
 635
 636                 netif_dbg(priv, rx_status, ndev,
 637                           "p=%d, c=%d, rd_ptr=%d, len=%d, flag=0x%04x\n",
 638                           p_index, priv->rx_c_index, priv->rx_read_ptr,
 639                           len, status);
 640
 641                 if (unlikely(len > RX_BUF_LENGTH)) {
 642                         netif_err(priv, rx_status, ndev, "oversized packet\n");
 643                         ndev->stats.rx_length_errors++;
 644                         ndev->stats.rx_errors++;
 645                         dev_kfree_skb_any(skb);
 646                         goto next;
 647                 }
 648
 649                 if (unlikely(!(status & DESC_EOP) || !(status & DESC_SOP))) {
 650                         netif_err(priv, rx_status, ndev, "fragmented packet!\n");
 651                         ndev->stats.rx_dropped++;
 652                         ndev->stats.rx_errors++;
 653                         dev_kfree_skb_any(skb);
 654                         goto next;
 655                 }
 656
 657                 if (unlikely(status & (RX_STATUS_ERR | RX_STATUS_OVFLOW))) {
 658                         netif_err(priv, rx_err, ndev, "error packet\n");
 659                         if (status & RX_STATUS_OVFLOW)
 660                                 ndev->stats.rx_over_errors++;
 661                         ndev->stats.rx_dropped++;
 662                         ndev->stats.rx_errors++;
 663                         dev_kfree_skb_any(skb);
 664                         goto next;
 665                 }
 666
 667                 skb_put(skb, len);
 668
 669                 /* Hardware validated our checksum */
 670                 if (likely(status & DESC_L4_CSUM))
 671                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 672
 673                 /* Hardware pre-pends packets with 2bytes before Ethernet
 674                  * header plus we have the Receive Status Block, strip off all
 675                  * of this from the SKB.
 676                  */
 677                 skb_pull(skb, sizeof(*rsb) + 2);
 678                 len -= (sizeof(*rsb) + 2);
 679
 680                 /* UniMAC may forward CRC */
 681                 if (priv->crc_fwd) {
 682                         skb_trim(skb, len - ETH_FCS_LEN);
 683                         len -= ETH_FCS_LEN;
 684                 }
 685
 686                 skb->protocol = eth_type_trans(skb, ndev);
 687                 ndev->stats.rx_packets++;
 688                 ndev->stats.rx_bytes += len;
 689
 690                 napi_gro_receive(&priv->napi, skb);
 691 next:
 692                 processed++;
 693                 priv->rx_read_ptr++;
 694
 695                 if (priv->rx_read_ptr == priv->num_rx_bds)
 696                         priv->rx_read_ptr = 0;
 697         }
 698
 699         return processed;
 700 }
 701
 702 static void bcm_sysport_tx_reclaim_one(struct bcm_sysport_priv *priv,
 703                                        struct bcm_sysport_cb *cb,
 704                                        unsigned int *bytes_compl,
 705                                        unsigned int *pkts_compl)
 706 {
 707         struct device *kdev = &priv->pdev->dev;
 708         struct net_device *ndev = priv->netdev;
 709
 710         if (cb->skb) {
 711                 ndev->stats.tx_bytes += cb->skb->len;
 712                 *bytes_compl += cb->skb->len;
 713                 dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
 714                                  dma_unmap_len(cb, dma_len),
 715                                  DMA_TO_DEVICE);
 716                 ndev->stats.tx_packets++;
 717                 (*pkts_compl)++;
 718                 bcm_sysport_free_cb(cb);
 719         /* SKB fragment */
 720         } else if (dma_unmap_addr(cb, dma_addr)) {
 721                 ndev->stats.tx_bytes += dma_unmap_len(cb, dma_len);
 722                 dma_unmap_page(kdev, dma_unmap_addr(cb, dma_addr),
 723                                dma_unmap_len(cb, dma_len), DMA_TO_DEVICE);
 724                 dma_unmap_addr_set(cb, dma_addr, 0);
 725         }
 726 }
 727
 728 /* Reclaim queued SKBs for transmission completion, lockless version */
 729 static unsigned int __bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
 730                                              struct bcm_sysport_tx_ring *ring)
 731 {
 732         struct net_device *ndev = priv->netdev;
 733         unsigned int c_index, last_c_index, last_tx_cn, num_tx_cbs;
 734         unsigned int pkts_compl = 0, bytes_compl = 0;
 735         struct bcm_sysport_cb *cb;
 736         struct netdev_queue *txq;
 737         u32 hw_ind;
 738
 739         txq = netdev_get_tx_queue(ndev, ring->index);
 740
 741         /* Compute how many descriptors have been processed since last call */
 742         hw_ind = tdma_readl(priv, TDMA_DESC_RING_PROD_CONS_INDEX(ring->index));
 743         c_index = (hw_ind >> RING_CONS_INDEX_SHIFT) & RING_CONS_INDEX_MASK;
 744         ring->p_index = (hw_ind & RING_PROD_INDEX_MASK);
 745
 746         last_c_index = ring->c_index;
 747         num_tx_cbs = ring->size;
 748
 749         c_index &= (num_tx_cbs - 1);
 750
 751         if (c_index >= last_c_index)
 752                 last_tx_cn = c_index - last_c_index;
 753         else
 754                 last_tx_cn = num_tx_cbs - last_c_index + c_index;
 755
 756         netif_dbg(priv, tx_done, ndev,
 757                   "ring=%d c_index=%d last_tx_cn=%d last_c_index=%d\n",
 758                   ring->index, c_index, last_tx_cn, last_c_index);
 759
 760         while (last_tx_cn-- > 0) {
 761                 cb = ring->cbs + last_c_index;
 762                 bcm_sysport_tx_reclaim_one(priv, cb, &bytes_compl, &pkts_compl);
 763
 764                 ring->desc_count++;
 765                 last_c_index++;
 766                 last_c_index &= (num_tx_cbs - 1);
 767         }
 768
 769         ring->c_index = c_index;
 770
 771         if (netif_tx_queue_stopped(txq) && pkts_compl)
 772                 netif_tx_wake_queue(txq);
 773
 774         netif_dbg(priv, tx_done, ndev,
 775                   "ring=%d c_index=%d pkts_compl=%d, bytes_compl=%d\n",
 776                   ring->index, ring->c_index, pkts_compl, bytes_compl);
 777
 778         return pkts_compl;
 779 }
 780
 781 /* Locked version of the per-ring TX reclaim routine */
 782 static unsigned int bcm_sysport_tx_reclaim(struct bcm_sysport_priv *priv,
 783                                            struct bcm_sysport_tx_ring *ring)
 784 {
 785         unsigned int released;
 786         unsigned long flags;
 787
 788         spin_lock_irqsave(&ring->lock, flags);
 789         released = __bcm_sysport_tx_reclaim(priv, ring);
 790         spin_unlock_irqrestore(&ring->lock, flags);
 791
 792         return released;
 793 }
 794
 795 static int bcm_sysport_tx_poll(struct napi_struct *napi, int budget)
 796 {
 797         struct bcm_sysport_tx_ring *ring =
 798                 container_of(napi, struct bcm_sysport_tx_ring, napi);
 799         unsigned int work_done = 0;
 800
 801         work_done = bcm_sysport_tx_reclaim(ring->priv, ring);
 802
 803         if (work_done == 0) {
 804                 napi_complete(napi);
 805                 /* re-enable TX interrupt */
 806                 intrl2_1_mask_clear(ring->priv, BIT(ring->index));
 807
 808                 return 0;
 809         }
 810
 811         return budget;
 812 }
 813
 814 static void bcm_sysport_tx_reclaim_all(struct bcm_sysport_priv *priv)
 815 {
 816         unsigned int q;
 817
 818         for (q = 0; q < priv->netdev->num_tx_queues; q++)
 819                 bcm_sysport_tx_reclaim(priv, &priv->tx_rings[q]);
 820 }
 821
 822 static int bcm_sysport_poll(struct napi_struct *napi, int budget)
 823 {
 824         struct bcm_sysport_priv *priv =
 825                 container_of(napi, struct bcm_sysport_priv, napi);
 826         unsigned int work_done = 0;
 827
 828         work_done = bcm_sysport_desc_rx(priv, budget);
 829
 830         priv->rx_c_index += work_done;
 831         priv->rx_c_index &= RDMA_CONS_INDEX_MASK;
 832         rdma_writel(priv, priv->rx_c_index, RDMA_CONS_INDEX);
 833
 834         if (work_done < budget) {
 835                 napi_complete(napi);
 836                 /* re-enable RX interrupts */
 837                 intrl2_0_mask_clear(priv, INTRL2_0_RDMA_MBDONE);
 838         }
 839
 840         return work_done;
 841 }
 842
 843 static void bcm_sysport_resume_from_wol(struct bcm_sysport_priv *priv)
 844 {
 845         u32 reg;
 846
 847         /* Stop monitoring MPD interrupt */
 848         intrl2_0_mask_set(priv, INTRL2_0_MPD);
 849
 850         /* Clear the MagicPacket detection logic */
 851         reg = umac_readl(priv, UMAC_MPD_CTRL);
 852         reg &= ~MPD_EN;
 853         umac_writel(priv, reg, UMAC_MPD_CTRL);
 854
 855         netif_dbg(priv, wol, priv->netdev, "resumed from WOL\n");
 856 }
 857
 858 /* RX and misc interrupt routine */
 859 static irqreturn_t bcm_sysport_rx_isr(int irq, void *dev_id)
 860 {
 861         struct net_device *dev = dev_id;
 862         struct bcm_sysport_priv *priv = netdev_priv(dev);
 863
 864         priv->irq0_stat = intrl2_0_readl(priv, INTRL2_CPU_STATUS) &
 865                           ~intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
 866         intrl2_0_writel(priv, priv->irq0_stat, INTRL2_CPU_CLEAR);
 867
 868         if (unlikely(priv->irq0_stat == 0)) {
 869                 netdev_warn(priv->netdev, "spurious RX interrupt\n");
 870                 return IRQ_NONE;
 871         }
 872
 873         if (priv->irq0_stat & INTRL2_0_RDMA_MBDONE) {
 874                 if (likely(napi_schedule_prep(&priv->napi))) {
 875                         /* disable RX interrupts */
 876                         intrl2_0_mask_set(priv, INTRL2_0_RDMA_MBDONE);
 877                         __napi_schedule(&priv->napi);
 878                 }
 879         }
 880
 881         /* TX ring is full, perform a full reclaim since we do not know
 882          * which one would trigger this interrupt
 883          */
 884         if (priv->irq0_stat & INTRL2_0_TX_RING_FULL)
 885                 bcm_sysport_tx_reclaim_all(priv);
 886
 887         if (priv->irq0_stat & INTRL2_0_MPD) {
 888                 netdev_info(priv->netdev, "Wake-on-LAN interrupt!\n");
 889                 bcm_sysport_resume_from_wol(priv);
 890         }
 891
 892         return IRQ_HANDLED;
 893 }
 894
 895 /* TX interrupt service routine */
 896 static irqreturn_t bcm_sysport_tx_isr(int irq, void *dev_id)
 897 {
 898         struct net_device *dev = dev_id;
 899         struct bcm_sysport_priv *priv = netdev_priv(dev);
 900         struct bcm_sysport_tx_ring *txr;
 901         unsigned int ring;
 902
 903         priv->irq1_stat = intrl2_1_readl(priv, INTRL2_CPU_STATUS) &
 904                                 ~intrl2_1_readl(priv, INTRL2_CPU_MASK_STATUS);
 905         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
 906
 907         if (unlikely(priv->irq1_stat == 0)) {
 908                 netdev_warn(priv->netdev, "spurious TX interrupt\n");
 909                 return IRQ_NONE;
 910         }
 911
 912         for (ring = 0; ring < dev->num_tx_queues; ring++) {
 913                 if (!(priv->irq1_stat & BIT(ring)))
 914                         continue;
 915
 916                 txr = &priv->tx_rings[ring];
 917
 918                 if (likely(napi_schedule_prep(&txr->napi))) {
 919                         intrl2_1_mask_set(priv, BIT(ring));
 920                         __napi_schedule(&txr->napi);
 921                 }
 922         }
 923
 924         return IRQ_HANDLED;
 925 }
 926
 927 static irqreturn_t bcm_sysport_wol_isr(int irq, void *dev_id)
 928 {
 929         struct bcm_sysport_priv *priv = dev_id;
 930
 931         pm_wakeup_event(&priv->pdev->dev, 0);
 932
 933         return IRQ_HANDLED;
 934 }
 935
 936 static struct sk_buff *bcm_sysport_insert_tsb(struct sk_buff *skb,
 937                                               struct net_device *dev)
 938 {
 939         struct sk_buff *nskb;
 940         struct bcm_tsb *tsb;
 941         u32 csum_info;
 942         u8 ip_proto;
 943         u16 csum_start;
 944         u16 ip_ver;
 945
 946         /* Re-allocate SKB if needed */
 947         if (unlikely(skb_headroom(skb) < sizeof(*tsb))) {
 948                 nskb = skb_realloc_headroom(skb, sizeof(*tsb));
 949                 dev_kfree_skb(skb);
 950                 if (!nskb) {
 951                         dev->stats.tx_errors++;
 952                         dev->stats.tx_dropped++;
 953                         return NULL;
 954                 }
 955                 skb = nskb;
 956         }
 957
 958         tsb = (struct bcm_tsb *)skb_push(skb, sizeof(*tsb));
 959         /* Zero-out TSB by default */
 960         memset(tsb, 0, sizeof(*tsb));
 961
 962         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 963                 ip_ver = htons(skb->protocol);
 964                 switch (ip_ver) {
 965                 case ETH_P_IP:
 966                         ip_proto = ip_hdr(skb)->protocol;
 967                         break;
 968                 case ETH_P_IPV6:
 969                         ip_proto = ipv6_hdr(skb)->nexthdr;
 970                         break;
 971                 default:
 972                         return skb;
 973                 }
 974
 975                 /* Get the checksum offset and the L4 (transport) offset */
 976                 csum_start = skb_checksum_start_offset(skb) - sizeof(*tsb);
 977                 csum_info = (csum_start + skb->csum_offset) & L4_CSUM_PTR_MASK;
 978                 csum_info |= (csum_start << L4_PTR_SHIFT);
 979
 980                 if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
 981                         csum_info |= L4_LENGTH_VALID;
 982                         if (ip_proto == IPPROTO_UDP && ip_ver == ETH_P_IP)
 983                                 csum_info |= L4_UDP;
 984                 } else {
 985                         csum_info = 0;
 986                 }
 987
 988                 tsb->l4_ptr_dest_map = csum_info;
 989         }
 990
 991         return skb;
 992 }
 993
 994 static netdev_tx_t bcm_sysport_xmit(struct sk_buff *skb,
 995                                     struct net_device *dev)
 996 {
 997         struct bcm_sysport_priv *priv = netdev_priv(dev);
 998         struct device *kdev = &priv->pdev->dev;
 999         struct bcm_sysport_tx_ring *ring;
1000         struct bcm_sysport_cb *cb;
1001         struct netdev_queue *txq;
1002         struct dma_desc *desc;
1003         unsigned int skb_len;
1004         unsigned long flags;
1005         dma_addr_t mapping;
1006         u32 len_status;
1007         u16 queue;
1008         int ret;
1009
1010         queue = skb_get_queue_mapping(skb);
1011         txq = netdev_get_tx_queue(dev, queue);
1012         ring = &priv->tx_rings[queue];
1013
1014         /* lock against tx reclaim in BH context and TX ring full interrupt */
1015         spin_lock_irqsave(&ring->lock, flags);
1016         if (unlikely(ring->desc_count == 0)) {
1017                 netif_tx_stop_queue(txq);
1018                 netdev_err(dev, "queue %d awake and ring full!\n", queue);
1019                 ret = NETDEV_TX_BUSY;
1020                 goto out;
1021         }
1022
1023         /* Insert TSB and checksum infos */
1024         if (priv->tsb_en) {
1025                 skb = bcm_sysport_insert_tsb(skb, dev);
1026                 if (!skb) {
1027                         ret = NETDEV_TX_OK;
1028                         goto out;
1029                 }
1030         }
1031
1032         /* The Ethernet switch we are interfaced with needs packets to be at
1033          * least 64 bytes (including FCS) otherwise they will be discarded when
1034          * they enter the switch port logic. When Broadcom tags are enabled, we
1035          * need to make sure that packets are at least 68 bytes
1036          * (including FCS and tag) because the length verification is done after
1037          * the Broadcom tag is stripped off the ingress packet.
1038          */
1039         if (skb_padto(skb, ETH_ZLEN + ENET_BRCM_TAG_LEN)) {
1040                 ret = NETDEV_TX_OK;
1041                 goto out;
1042         }
1043
1044         skb_len = skb->len < ETH_ZLEN + ENET_BRCM_TAG_LEN ?
1045                         ETH_ZLEN + ENET_BRCM_TAG_LEN : skb->len;
1046
1047         mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
1048         if (dma_mapping_error(kdev, mapping)) {
1049                 priv->mib.tx_dma_failed++;
1050                 netif_err(priv, tx_err, dev, "DMA map failed at %p (len=%d)\n",
1051                           skb->data, skb_len);
1052                 ret = NETDEV_TX_OK;
1053                 goto out;
1054         }
1055
1056         /* Remember the SKB for future freeing */
1057         cb = &ring->cbs[ring->curr_desc];
1058         cb->skb = skb;
1059         dma_unmap_addr_set(cb, dma_addr, mapping);
1060         dma_unmap_len_set(cb, dma_len, skb_len);
1061
1062         /* Fetch a descriptor entry from our pool */
1063         desc = ring->desc_cpu;
1064
1065         desc->addr_lo = lower_32_bits(mapping);
1066         len_status = upper_32_bits(mapping) & DESC_ADDR_HI_MASK;
1067         len_status |= (skb_len << DESC_LEN_SHIFT);
1068         len_status |= (DESC_SOP | DESC_EOP | TX_STATUS_APP_CRC) <<
1069                        DESC_STATUS_SHIFT;
1070         if (skb->ip_summed == CHECKSUM_PARTIAL)
1071                 len_status |= (DESC_L4_CSUM << DESC_STATUS_SHIFT);
1072
1073         ring->curr_desc++;
1074         if (ring->curr_desc == ring->size)
1075                 ring->curr_desc = 0;
1076         ring->desc_count--;
1077
1078         /* Ensure write completion of the descriptor status/length
1079          * in DRAM before the System Port WRITE_PORT register latches
1080          * the value
1081          */
1082         wmb();
1083         desc->addr_status_len = len_status;
1084         wmb();
1085
1086         /* Write this descriptor address to the RING write port */
1087         tdma_port_write_desc_addr(priv, desc, ring->index);
1088
1089         /* Check ring space and update SW control flow */
1090         if (ring->desc_count == 0)
1091                 netif_tx_stop_queue(txq);
1092
1093         netif_dbg(priv, tx_queued, dev, "ring=%d desc_count=%d, curr_desc=%d\n",
1094                   ring->index, ring->desc_count, ring->curr_desc);
1095
1096         ret = NETDEV_TX_OK;
1097 out:
1098         spin_unlock_irqrestore(&ring->lock, flags);
1099         return ret;
1100 }
1101
1102 static void bcm_sysport_tx_timeout(struct net_device *dev)
1103 {
1104         netdev_warn(dev, "transmit timeout!\n");
1105
1106         dev->trans_start = jiffies;
1107         dev->stats.tx_errors++;
1108
1109         netif_tx_wake_all_queues(dev);
1110 }
1111
1112 /* phylib adjust link callback */
1113 static void bcm_sysport_adj_link(struct net_device *dev)
1114 {
1115         struct bcm_sysport_priv *priv = netdev_priv(dev);
1116         struct phy_device *phydev = priv->phydev;
1117         unsigned int changed = 0;
1118         u32 cmd_bits = 0, reg;
1119
1120         if (priv->old_link != phydev->link) {
1121                 changed = 1;
1122                 priv->old_link = phydev->link;
1123         }
1124
1125         if (priv->old_duplex != phydev->duplex) {
1126                 changed = 1;
1127                 priv->old_duplex = phydev->duplex;
1128         }
1129
1130         switch (phydev->speed) {
1131         case SPEED_2500:
1132                 cmd_bits = CMD_SPEED_2500;
1133                 break;
1134         case SPEED_1000:
1135                 cmd_bits = CMD_SPEED_1000;
1136                 break;
1137         case SPEED_100:
1138                 cmd_bits = CMD_SPEED_100;
1139                 break;
1140         case SPEED_10:
1141                 cmd_bits = CMD_SPEED_10;
1142                 break;
1143         default:
1144                 break;
1145         }
1146         cmd_bits <<= CMD_SPEED_SHIFT;
1147
1148         if (phydev->duplex == DUPLEX_HALF)
1149                 cmd_bits |= CMD_HD_EN;
1150
1151         if (priv->old_pause != phydev->pause) {
1152                 changed = 1;
1153                 priv->old_pause = phydev->pause;
1154         }
1155
1156         if (!phydev->pause)
1157                 cmd_bits |= CMD_RX_PAUSE_IGNORE | CMD_TX_PAUSE_IGNORE;
1158
1159         if (!changed)
1160                 return;
1161
1162         if (phydev->link) {
1163                 reg = umac_readl(priv, UMAC_CMD);
1164                 reg &= ~((CMD_SPEED_MASK << CMD_SPEED_SHIFT) |
1165                         CMD_HD_EN | CMD_RX_PAUSE_IGNORE |
1166                         CMD_TX_PAUSE_IGNORE);
1167                 reg |= cmd_bits;
1168                 umac_writel(priv, reg, UMAC_CMD);
1169         }
1170
1171         phy_print_status(priv->phydev);
1172 }
1173
1174 static int bcm_sysport_init_tx_ring(struct bcm_sysport_priv *priv,
1175                                     unsigned int index)
1176 {
1177         struct bcm_sysport_tx_ring *ring = &priv->tx_rings[index];
1178         struct device *kdev = &priv->pdev->dev;
1179         size_t size;
1180         void *p;
1181         u32 reg;
1182
1183         /* Simple descriptors partitioning for now */
1184         size = 256;
1185
1186         /* We just need one DMA descriptor which is DMA-able, since writing to
1187          * the port will allocate a new descriptor in its internal linked-list
1188          */
1189         p = dma_zalloc_coherent(kdev, sizeof(struct dma_desc), &ring->desc_dma,
1190                                 GFP_KERNEL);
1191         if (!p) {
1192                 netif_err(priv, hw, priv->netdev, "DMA alloc failed\n");
1193                 return -ENOMEM;
1194         }
1195
1196         ring->cbs = kcalloc(size, sizeof(struct bcm_sysport_cb), GFP_KERNEL);
1197         if (!ring->cbs) {
1198                 netif_err(priv, hw, priv->netdev, "CB allocation failed\n");
1199                 return -ENOMEM;
1200         }
1201
1202         /* Initialize SW view of the ring */
1203         spin_lock_init(&ring->lock);
1204         ring->priv = priv;
1205         netif_napi_add(priv->netdev, &ring->napi, bcm_sysport_tx_poll, 64);
1206         ring->index = index;
1207         ring->size = size;
1208         ring->alloc_size = ring->size;
1209         ring->desc_cpu = p;
1210         ring->desc_count = ring->size;
1211         ring->curr_desc = 0;
1212
1213         /* Initialize HW ring */
1214         tdma_writel(priv, RING_EN, TDMA_DESC_RING_HEAD_TAIL_PTR(index));
1215         tdma_writel(priv, 0, TDMA_DESC_RING_COUNT(index));
1216         tdma_writel(priv, 1, TDMA_DESC_RING_INTR_CONTROL(index));
1217         tdma_writel(priv, 0, TDMA_DESC_RING_PROD_CONS_INDEX(index));
1218         tdma_writel(priv, RING_IGNORE_STATUS, TDMA_DESC_RING_MAPPING(index));
1219         tdma_writel(priv, 0, TDMA_DESC_RING_PCP_DEI_VID(index));
1220
1221         /* Program the number of descriptors as MAX_THRESHOLD and half of
1222          * its size for the hysteresis trigger
1223          */
1224         tdma_writel(priv, ring->size |
1225                         1 << RING_HYST_THRESH_SHIFT,
1226                         TDMA_DESC_RING_MAX_HYST(index));
1227
1228         /* Enable the ring queue in the arbiter */
1229         reg = tdma_readl(priv, TDMA_TIER1_ARB_0_QUEUE_EN);
1230         reg |= (1 << index);
1231         tdma_writel(priv, reg, TDMA_TIER1_ARB_0_QUEUE_EN);
1232
1233         napi_enable(&ring->napi);
1234
1235         netif_dbg(priv, hw, priv->netdev,
1236                   "TDMA cfg, size=%d, desc_cpu=%p\n",
1237                   ring->size, ring->desc_cpu);
1238
1239         return 0;
1240 }
1241
1242 static void bcm_sysport_fini_tx_ring(struct bcm_sysport_priv *priv,
1243                                      unsigned int index)
1244 {
1245         struct bcm_sysport_tx_ring *ring = &priv->tx_rings[index];
1246         struct device *kdev = &priv->pdev->dev;
1247         u32 reg;
1248
1249         /* Caller should stop the TDMA engine */
1250         reg = tdma_readl(priv, TDMA_STATUS);
1251         if (!(reg & TDMA_DISABLED))
1252                 netdev_warn(priv->netdev, "TDMA not stopped!\n");
1253
1254         /* ring->cbs is the last part in bcm_sysport_init_tx_ring which could
1255          * fail, so by checking this pointer we know whether the TX ring was
1256          * fully initialized or not.
1257          */
1258         if (!ring->cbs)
1259                 return;
1260
1261         napi_disable(&ring->napi);
1262         netif_napi_del(&ring->napi);
1263
1264         bcm_sysport_tx_reclaim(priv, ring);
1265
1266         kfree(ring->cbs);
1267         ring->cbs = NULL;
1268
1269         if (ring->desc_dma) {
1270                 dma_free_coherent(kdev, sizeof(struct dma_desc),
1271                                   ring->desc_cpu, ring->desc_dma);
1272                 ring->desc_dma = 0;
1273         }
1274         ring->size = 0;
1275         ring->alloc_size = 0;
1276
1277         netif_dbg(priv, hw, priv->netdev, "TDMA fini done\n");
1278 }
1279
1280 /* RDMA helper */
1281 static inline int rdma_enable_set(struct bcm_sysport_priv *priv,
1282                                   unsigned int enable)
1283 {
1284         unsigned int timeout = 1000;
1285         u32 reg;
1286
1287         reg = rdma_readl(priv, RDMA_CONTROL);
1288         if (enable)
1289                 reg |= RDMA_EN;
1290         else
1291                 reg &= ~RDMA_EN;
1292         rdma_writel(priv, reg, RDMA_CONTROL);
1293
1294         /* Poll for RMDA disabling completion */
1295         do {
1296                 reg = rdma_readl(priv, RDMA_STATUS);
1297                 if (!!(reg & RDMA_DISABLED) == !enable)
1298                         return 0;
1299                 usleep_range(1000, 2000);
1300         } while (timeout-- > 0);
1301
1302         netdev_err(priv->netdev, "timeout waiting for RDMA to finish\n");
1303
1304         return -ETIMEDOUT;
1305 }
1306
1307 /* TDMA helper */
1308 static inline int tdma_enable_set(struct bcm_sysport_priv *priv,
1309                                   unsigned int enable)
1310 {
1311         unsigned int timeout = 1000;
1312         u32 reg;
1313
1314         reg = tdma_readl(priv, TDMA_CONTROL);
1315         if (enable)
1316                 reg |= TDMA_EN;
1317         else
1318                 reg &= ~TDMA_EN;
1319         tdma_writel(priv, reg, TDMA_CONTROL);
1320
1321         /* Poll for TMDA disabling completion */
1322         do {
1323                 reg = tdma_readl(priv, TDMA_STATUS);
1324                 if (!!(reg & TDMA_DISABLED) == !enable)
1325                         return 0;
1326
1327                 usleep_range(1000, 2000);
1328         } while (timeout-- > 0);
1329
1330         netdev_err(priv->netdev, "timeout waiting for TDMA to finish\n");
1331
1332         return -ETIMEDOUT;
1333 }
1334
1335 static int bcm_sysport_init_rx_ring(struct bcm_sysport_priv *priv)
1336 {
1337         struct bcm_sysport_cb *cb;
1338         u32 reg;
1339         int ret;
1340         int i;
1341
1342         /* Initialize SW view of the RX ring */
1343         priv->num_rx_bds = NUM_RX_DESC;
1344         priv->rx_bds = priv->base + SYS_PORT_RDMA_OFFSET;
1345         priv->rx_c_index = 0;
1346         priv->rx_read_ptr = 0;
1347         priv->rx_cbs = kcalloc(priv->num_rx_bds, sizeof(struct bcm_sysport_cb),
1348                                 GFP_KERNEL);
1349         if (!priv->rx_cbs) {
1350                 netif_err(priv, hw, priv->netdev, "CB allocation failed\n");
1351                 return -ENOMEM;
1352         }
1353
1354         for (i = 0; i < priv->num_rx_bds; i++) {
1355                 cb = priv->rx_cbs + i;
1356                 cb->bd_addr = priv->rx_bds + i * DESC_SIZE;
1357         }
1358
1359         ret = bcm_sysport_alloc_rx_bufs(priv);
1360         if (ret) {
1361                 netif_err(priv, hw, priv->netdev, "SKB allocation failed\n");
1362                 return ret;
1363         }
1364
1365         /* Initialize HW, ensure RDMA is disabled */
1366         reg = rdma_readl(priv, RDMA_STATUS);
1367         if (!(reg & RDMA_DISABLED))
1368                 rdma_enable_set(priv, 0);
1369
1370         rdma_writel(priv, 0, RDMA_WRITE_PTR_LO);
1371         rdma_writel(priv, 0, RDMA_WRITE_PTR_HI);
1372         rdma_writel(priv, 0, RDMA_PROD_INDEX);
1373         rdma_writel(priv, 0, RDMA_CONS_INDEX);
1374         rdma_writel(priv, priv->num_rx_bds << RDMA_RING_SIZE_SHIFT |
1375                           RX_BUF_LENGTH, RDMA_RING_BUF_SIZE);
1376         /* Operate the queue in ring mode */
1377         rdma_writel(priv, 0, RDMA_START_ADDR_HI);
1378         rdma_writel(priv, 0, RDMA_START_ADDR_LO);
1379         rdma_writel(priv, 0, RDMA_END_ADDR_HI);
1380         rdma_writel(priv, NUM_HW_RX_DESC_WORDS - 1, RDMA_END_ADDR_LO);
1381
1382         rdma_writel(priv, 1, RDMA_MBDONE_INTR);
1383
1384         netif_dbg(priv, hw, priv->netdev,
1385                   "RDMA cfg, num_rx_bds=%d, rx_bds=%p\n",
1386                   priv->num_rx_bds, priv->rx_bds);
1387
1388         return 0;
1389 }
1390
1391 static void bcm_sysport_fini_rx_ring(struct bcm_sysport_priv *priv)
1392 {
1393         struct bcm_sysport_cb *cb;
1394         unsigned int i;
1395         u32 reg;
1396
1397         /* Caller should ensure RDMA is disabled */
1398         reg = rdma_readl(priv, RDMA_STATUS);
1399         if (!(reg & RDMA_DISABLED))
1400                 netdev_warn(priv->netdev, "RDMA not stopped!\n");
1401
1402         for (i = 0; i < priv->num_rx_bds; i++) {
1403                 cb = &priv->rx_cbs[i];
1404                 if (dma_unmap_addr(cb, dma_addr))
1405                         dma_unmap_single(&priv->pdev->dev,
1406                                          dma_unmap_addr(cb, dma_addr),
1407                                          RX_BUF_LENGTH, DMA_FROM_DEVICE);
1408                 bcm_sysport_free_cb(cb);
1409         }
1410
1411         kfree(priv->rx_cbs);
1412         priv->rx_cbs = NULL;
1413
1414         netif_dbg(priv, hw, priv->netdev, "RDMA fini done\n");
1415 }
1416
1417 static void bcm_sysport_set_rx_mode(struct net_device *dev)
1418 {
1419         struct bcm_sysport_priv *priv = netdev_priv(dev);
1420         u32 reg;
1421
1422         reg = umac_readl(priv, UMAC_CMD);
1423         if (dev->flags & IFF_PROMISC)
1424                 reg |= CMD_PROMISC;
1425         else
1426                 reg &= ~CMD_PROMISC;
1427         umac_writel(priv, reg, UMAC_CMD);
1428
1429         /* No support for ALLMULTI */
1430         if (dev->flags & IFF_ALLMULTI)
1431                 return;
1432 }
1433
1434 static inline void umac_enable_set(struct bcm_sysport_priv *priv,
1435                                    u32 mask, unsigned int enable)
1436 {
1437         u32 reg;
1438
1439         reg = umac_readl(priv, UMAC_CMD);
1440         if (enable)
1441                 reg |= mask;
1442         else
1443                 reg &= ~mask;
1444         umac_writel(priv, reg, UMAC_CMD);
1445
1446         /* UniMAC stops on a packet boundary, wait for a full-sized packet
1447          * to be processed (1 msec).
1448          */
1449         if (enable == 0)
1450                 usleep_range(1000, 2000);
1451 }
1452
1453 static inline void umac_reset(struct bcm_sysport_priv *priv)
1454 {
1455         u32 reg;
1456
1457         reg = umac_readl(priv, UMAC_CMD);
1458         reg |= CMD_SW_RESET;
1459         umac_writel(priv, reg, UMAC_CMD);
1460         udelay(10);
1461         reg = umac_readl(priv, UMAC_CMD);
1462         reg &= ~CMD_SW_RESET;
1463         umac_writel(priv, reg, UMAC_CMD);
1464 }
1465
1466 static void umac_set_hw_addr(struct bcm_sysport_priv *priv,
1467                              unsigned char *addr)
1468 {
1469         umac_writel(priv, (addr[0] << 24) | (addr[1] << 16) |
1470                         (addr[2] << 8) | addr[3], UMAC_MAC0);
1471         umac_writel(priv, (addr[4] << 8) | addr[5], UMAC_MAC1);
1472 }
1473
1474 static void topctrl_flush(struct bcm_sysport_priv *priv)
1475 {
1476         topctrl_writel(priv, RX_FLUSH, RX_FLUSH_CNTL);
1477         topctrl_writel(priv, TX_FLUSH, TX_FLUSH_CNTL);
1478         mdelay(1);
1479         topctrl_writel(priv, 0, RX_FLUSH_CNTL);
1480         topctrl_writel(priv, 0, TX_FLUSH_CNTL);
1481 }
1482
1483 static int bcm_sysport_change_mac(struct net_device *dev, void *p)
1484 {
1485         struct bcm_sysport_priv *priv = netdev_priv(dev);
1486         struct sockaddr *addr = p;
1487
1488         if (!is_valid_ether_addr(addr->sa_data))
1489                 return -EINVAL;
1490
1491         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1492
1493         /* interface is disabled, changes to MAC will be reflected on next
1494          * open call
1495          */
1496         if (!netif_running(dev))
1497                 return 0;
1498
1499         umac_set_hw_addr(priv, dev->dev_addr);
1500
1501         return 0;
1502 }
1503
1504 static void bcm_sysport_netif_start(struct net_device *dev)
1505 {
1506         struct bcm_sysport_priv *priv = netdev_priv(dev);
1507
1508         /* Enable NAPI */
1509         napi_enable(&priv->napi);
1510
1511         /* Enable RX interrupt and TX ring full interrupt */
1512         intrl2_0_mask_clear(priv, INTRL2_0_RDMA_MBDONE | INTRL2_0_TX_RING_FULL);
1513
1514         phy_start(priv->phydev);
1515
1516         /* Enable TX interrupts for the 32 TXQs */
1517         intrl2_1_mask_clear(priv, 0xffffffff);
1518
1519         /* Last call before we start the real business */
1520         netif_tx_start_all_queues(dev);
1521 }
1522
1523 static void rbuf_init(struct bcm_sysport_priv *priv)
1524 {
1525         u32 reg;
1526
1527         reg = rbuf_readl(priv, RBUF_CONTROL);
1528         reg |= RBUF_4B_ALGN | RBUF_RSB_EN;
1529         rbuf_writel(priv, reg, RBUF_CONTROL);
1530 }
1531
1532 static int bcm_sysport_open(struct net_device *dev)
1533 {
1534         struct bcm_sysport_priv *priv = netdev_priv(dev);
1535         unsigned int i;
1536         int ret;
1537
1538         /* Reset UniMAC */
1539         umac_reset(priv);
1540
1541         /* Flush TX and RX FIFOs at TOPCTRL level */
1542         topctrl_flush(priv);
1543
1544         /* Disable the UniMAC RX/TX */
1545         umac_enable_set(priv, CMD_RX_EN | CMD_TX_EN, 0);
1546
1547         /* Enable RBUF 2bytes alignment and Receive Status Block */
1548         rbuf_init(priv);
1549
1550         /* Set maximum frame length */
1551         umac_writel(priv, UMAC_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
1552
1553         /* Set MAC address */
1554         umac_set_hw_addr(priv, dev->dev_addr);
1555
1556         /* Read CRC forward */
1557         priv->crc_fwd = !!(umac_readl(priv, UMAC_CMD) & CMD_CRC_FWD);
1558
1559         priv->phydev = of_phy_connect(dev, priv->phy_dn, bcm_sysport_adj_link,
1560                                         0, priv->phy_interface);
1561         if (!priv->phydev) {
1562                 netdev_err(dev, "could not attach to PHY\n");
1563                 return -ENODEV;
1564         }
1565
1566         /* Reset house keeping link status */
1567         priv->old_duplex = -1;
1568         priv->old_link = -1;
1569         priv->old_pause = -1;
1570
1571         /* mask all interrupts and request them */
1572         intrl2_0_writel(priv, 0xffffffff, INTRL2_CPU_MASK_SET);
1573         intrl2_0_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1574         intrl2_0_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1575         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_MASK_SET);
1576         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1577         intrl2_1_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1578
1579         ret = request_irq(priv->irq0, bcm_sysport_rx_isr, 0, dev->name, dev);
1580         if (ret) {
1581                 netdev_err(dev, "failed to request RX interrupt\n");
1582                 goto out_phy_disconnect;
1583         }
1584
1585         ret = request_irq(priv->irq1, bcm_sysport_tx_isr, 0, dev->name, dev);
1586         if (ret) {
1587                 netdev_err(dev, "failed to request TX interrupt\n");
1588                 goto out_free_irq0;
1589         }
1590
1591         /* Initialize both hardware and software ring */
1592         for (i = 0; i < dev->num_tx_queues; i++) {
1593                 ret = bcm_sysport_init_tx_ring(priv, i);
1594                 if (ret) {
1595                         netdev_err(dev, "failed to initialize TX ring %d\n",
1596                                    i);
1597                         goto out_free_tx_ring;
1598                 }
1599         }
1600
1601         /* Initialize linked-list */
1602         tdma_writel(priv, TDMA_LL_RAM_INIT_BUSY, TDMA_STATUS);
1603
1604         /* Initialize RX ring */
1605         ret = bcm_sysport_init_rx_ring(priv);
1606         if (ret) {
1607                 netdev_err(dev, "failed to initialize RX ring\n");
1608                 goto out_free_rx_ring;
1609         }
1610
1611         /* Turn on RDMA */
1612         ret = rdma_enable_set(priv, 1);
1613         if (ret)
1614                 goto out_free_rx_ring;
1615
1616         /* Turn on TDMA */
1617         ret = tdma_enable_set(priv, 1);
1618         if (ret)
1619                 goto out_clear_rx_int;
1620
1621         /* Turn on UniMAC TX/RX */
1622         umac_enable_set(priv, CMD_RX_EN | CMD_TX_EN, 1);
1623
1624         bcm_sysport_netif_start(dev);
1625
1626         return 0;
1627
1628 out_clear_rx_int:
1629         intrl2_0_mask_set(priv, INTRL2_0_RDMA_MBDONE | INTRL2_0_TX_RING_FULL);
1630 out_free_rx_ring:
1631         bcm_sysport_fini_rx_ring(priv);
1632 out_free_tx_ring:
1633         for (i = 0; i < dev->num_tx_queues; i++)
1634                 bcm_sysport_fini_tx_ring(priv, i);
1635         free_irq(priv->irq1, dev);
1636 out_free_irq0:
1637         free_irq(priv->irq0, dev);
1638 out_phy_disconnect:
1639         phy_disconnect(priv->phydev);
1640         return ret;
1641 }
1642
1643 static void bcm_sysport_netif_stop(struct net_device *dev)
1644 {
1645         struct bcm_sysport_priv *priv = netdev_priv(dev);
1646
1647         /* stop all software from updating hardware */
1648         netif_tx_stop_all_queues(dev);
1649         napi_disable(&priv->napi);
1650         phy_stop(priv->phydev);
1651
1652         /* mask all interrupts */
1653         intrl2_0_mask_set(priv, 0xffffffff);
1654         intrl2_0_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1655         intrl2_1_mask_set(priv, 0xffffffff);
1656         intrl2_1_writel(priv, 0xffffffff, INTRL2_CPU_CLEAR);
1657 }
1658
1659 static int bcm_sysport_stop(struct net_device *dev)
1660 {
1661         struct bcm_sysport_priv *priv = netdev_priv(dev);
1662         unsigned int i;
1663         int ret;
1664
1665         bcm_sysport_netif_stop(dev);
1666
1667         /* Disable UniMAC RX */
1668         umac_enable_set(priv, CMD_RX_EN, 0);
1669
1670         ret = tdma_enable_set(priv, 0);
1671         if (ret) {
1672                 netdev_err(dev, "timeout disabling RDMA\n");
1673                 return ret;
1674         }
1675
1676         /* Wait for a maximum packet size to be drained */
1677         usleep_range(2000, 3000);
1678
1679         ret = rdma_enable_set(priv, 0);
1680         if (ret) {
1681                 netdev_err(dev, "timeout disabling TDMA\n");
1682                 return ret;
1683         }
1684
1685         /* Disable UniMAC TX */
1686         umac_enable_set(priv, CMD_TX_EN, 0);
1687
1688         /* Free RX/TX rings SW structures */
1689         for (i = 0; i < dev->num_tx_queues; i++)
1690                 bcm_sysport_fini_tx_ring(priv, i);
1691         bcm_sysport_fini_rx_ring(priv);
1692
1693         free_irq(priv->irq0, dev);
1694         free_irq(priv->irq1, dev);
1695
1696         /* Disconnect from PHY */
1697         phy_disconnect(priv->phydev);
1698
1699         return 0;
1700 }
1701
1702 static struct ethtool_ops bcm_sysport_ethtool_ops = {
1703         .get_settings           = bcm_sysport_get_settings,
1704         .set_settings           = bcm_sysport_set_settings,
1705         .get_drvinfo            = bcm_sysport_get_drvinfo,
1706         .get_msglevel           = bcm_sysport_get_msglvl,
1707         .set_msglevel           = bcm_sysport_set_msglvl,
1708         .get_link               = ethtool_op_get_link,
1709         .get_strings            = bcm_sysport_get_strings,
1710         .get_ethtool_stats      = bcm_sysport_get_stats,
1711         .get_sset_count         = bcm_sysport_get_sset_count,
1712         .get_wol                = bcm_sysport_get_wol,
1713         .set_wol                = bcm_sysport_set_wol,
1714         .get_coalesce           = bcm_sysport_get_coalesce,
1715         .set_coalesce           = bcm_sysport_set_coalesce,
1716 };
1717
1718 static const struct net_device_ops bcm_sysport_netdev_ops = {
1719         .ndo_start_xmit         = bcm_sysport_xmit,
1720         .ndo_tx_timeout         = bcm_sysport_tx_timeout,
1721         .ndo_open               = bcm_sysport_open,
1722         .ndo_stop               = bcm_sysport_stop,
1723         .ndo_set_features       = bcm_sysport_set_features,
1724         .ndo_set_rx_mode        = bcm_sysport_set_rx_mode,
1725         .ndo_set_mac_address    = bcm_sysport_change_mac,
1726 };
1727
1728 #define REV_FMT "v%2x.%02x"
1729
1730 static int bcm_sysport_probe(struct platform_device *pdev)
1731 {
1732         struct bcm_sysport_priv *priv;
1733         struct device_node *dn;
1734         struct net_device *dev;
1735         const void *macaddr;
1736         struct resource *r;
1737         u32 txq, rxq;
1738         int ret;
1739
1740         dn = pdev->dev.of_node;
1741         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1742
1743         /* Read the Transmit/Receive Queue properties */
1744         if (of_property_read_u32(dn, "systemport,num-txq", &txq))
1745                 txq = TDMA_NUM_RINGS;
1746         if (of_property_read_u32(dn, "systemport,num-rxq", &rxq))
1747                 rxq = 1;
1748
1749         dev = alloc_etherdev_mqs(sizeof(*priv), txq, rxq);
1750         if (!dev)
1751                 return -ENOMEM;
1752
1753         /* Initialize private members */
1754         priv = netdev_priv(dev);
1755
1756         priv->irq0 = platform_get_irq(pdev, 0);
1757         priv->irq1 = platform_get_irq(pdev, 1);
1758         priv->wol_irq = platform_get_irq(pdev, 2);
1759         if (priv->irq0 <= 0 || priv->irq1 <= 0) {
1760                 dev_err(&pdev->dev, "invalid interrupts\n");
1761                 ret = -EINVAL;
1762                 goto err;
1763         }
1764
1765         priv->base = devm_ioremap_resource(&pdev->dev, r);
1766         if (IS_ERR(priv->base)) {
1767                 ret = PTR_ERR(priv->base);
1768                 goto err;
1769         }
1770
1771         priv->netdev = dev;
1772         priv->pdev = pdev;
1773
1774         priv->phy_interface = of_get_phy_mode(dn);
1775         /* Default to GMII interface mode */
1776         if (priv->phy_interface < 0)
1777                 priv->phy_interface = PHY_INTERFACE_MODE_GMII;
1778
1779         /* In the case of a fixed PHY, the DT node associated
1780          * to the PHY is the Ethernet MAC DT node.
1781          */
1782         if (of_phy_is_fixed_link(dn)) {
1783                 ret = of_phy_register_fixed_link(dn);
1784                 if (ret) {
1785                         dev_err(&pdev->dev, "failed to register fixed PHY\n");
1786                         goto err;
1787                 }
1788
1789                 priv->phy_dn = dn;
1790         }
1791
1792         /* Initialize netdevice members */
1793         macaddr = of_get_mac_address(dn);
1794         if (!macaddr || !is_valid_ether_addr(macaddr)) {
1795                 dev_warn(&pdev->dev, "using random Ethernet MAC\n");
1796                 eth_hw_addr_random(dev);
1797         } else {
1798                 ether_addr_copy(dev->dev_addr, macaddr);
1799         }
1800
1801         SET_NETDEV_DEV(dev, &pdev->dev);
1802         dev_set_drvdata(&pdev->dev, dev);
1803         dev->ethtool_ops = &bcm_sysport_ethtool_ops;
1804         dev->netdev_ops = &bcm_sysport_netdev_ops;
1805         netif_napi_add(dev, &priv->napi, bcm_sysport_poll, 64);
1806
1807         /* HW supported features, none enabled by default */
1808         dev->hw_features |= NETIF_F_RXCSUM | NETIF_F_HIGHDMA |
1809                                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1810
1811         /* Request the WOL interrupt and advertise suspend if available */
1812         priv->wol_irq_disabled = 1;
1813         ret = devm_request_irq(&pdev->dev, priv->wol_irq,
1814                                bcm_sysport_wol_isr, 0, dev->name, priv);
1815         if (!ret)
1816                 device_set_wakeup_capable(&pdev->dev, 1);
1817
1818         /* Set the needed headroom once and for all */
1819         BUILD_BUG_ON(sizeof(struct bcm_tsb) != 8);
1820         dev->needed_headroom += sizeof(struct bcm_tsb);
1821
1822         /* libphy will adjust the link state accordingly */
1823         netif_carrier_off(dev);
1824
1825         ret = register_netdev(dev);
1826         if (ret) {
1827                 dev_err(&pdev->dev, "failed to register net_device\n");
1828                 goto err;
1829         }
1830
1831         priv->rev = topctrl_readl(priv, REV_CNTL) & REV_MASK;
1832         dev_info(&pdev->dev,
1833                  "Broadcom SYSTEMPORT" REV_FMT
1834                  " at 0x%p (irqs: %d, %d, TXQs: %d, RXQs: %d)\n",
1835                  (priv->rev >> 8) & 0xff, priv->rev & 0xff,
1836                  priv->base, priv->irq0, priv->irq1, txq, rxq);
1837
1838         return 0;
1839 err:
1840         free_netdev(dev);
1841         return ret;
1842 }
1843
1844 static int bcm_sysport_remove(struct platform_device *pdev)
1845 {
1846         struct net_device *dev = dev_get_drvdata(&pdev->dev);
1847
1848         /* Not much to do, ndo_close has been called
1849          * and we use managed allocations
1850          */
1851         unregister_netdev(dev);
1852         free_netdev(dev);
1853         dev_set_drvdata(&pdev->dev, NULL);
1854
1855         return 0;
1856 }
1857
1858 #ifdef CONFIG_PM_SLEEP
1859 static int bcm_sysport_suspend_to_wol(struct bcm_sysport_priv *priv)
1860 {
1861         struct net_device *ndev = priv->netdev;
1862         unsigned int timeout = 1000;
1863         u32 reg;
1864
1865         /* Password has already been programmed */
1866         reg = umac_readl(priv, UMAC_MPD_CTRL);
1867         reg |= MPD_EN;
1868         reg &= ~PSW_EN;
1869         if (priv->wolopts & WAKE_MAGICSECURE)
1870                 reg |= PSW_EN;
1871         umac_writel(priv, reg, UMAC_MPD_CTRL);
1872
1873         /* Make sure RBUF entered WoL mode as result */
1874         do {
1875                 reg = rbuf_readl(priv, RBUF_STATUS);
1876                 if (reg & RBUF_WOL_MODE)
1877                         break;
1878
1879                 udelay(10);
1880         } while (timeout-- > 0);
1881
1882         /* Do not leave the UniMAC RBUF matching only MPD packets */
1883         if (!timeout) {
1884                 reg = umac_readl(priv, UMAC_MPD_CTRL);
1885                 reg &= ~MPD_EN;
1886                 umac_writel(priv, reg, UMAC_MPD_CTRL);
1887                 netif_err(priv, wol, ndev, "failed to enter WOL mode\n");
1888                 return -ETIMEDOUT;
1889         }
1890
1891         /* UniMAC receive needs to be turned on */
1892         umac_enable_set(priv, CMD_RX_EN, 1);
1893
1894         /* Enable the interrupt wake-up source */
1895         intrl2_0_mask_clear(priv, INTRL2_0_MPD);
1896
1897         netif_dbg(priv, wol, ndev, "entered WOL mode\n");
1898
1899         return 0;
1900 }
1901
1902 static int bcm_sysport_suspend(struct device *d)
1903 {
1904         struct net_device *dev = dev_get_drvdata(d);
1905         struct bcm_sysport_priv *priv = netdev_priv(dev);
1906         unsigned int i;
1907         int ret = 0;
1908         u32 reg;
1909
1910         if (!netif_running(dev))
1911                 return 0;
1912
1913         bcm_sysport_netif_stop(dev);
1914
1915         phy_suspend(priv->phydev);
1916
1917         netif_device_detach(dev);
1918
1919         /* Disable UniMAC RX */
1920         umac_enable_set(priv, CMD_RX_EN, 0);
1921
1922         ret = rdma_enable_set(priv, 0);
1923         if (ret) {
1924                 netdev_err(dev, "RDMA timeout!\n");
1925                 return ret;
1926         }
1927
1928         /* Disable RXCHK if enabled */
1929         if (priv->rx_chk_en) {
1930                 reg = rxchk_readl(priv, RXCHK_CONTROL);
1931                 reg &= ~RXCHK_EN;
1932                 rxchk_writel(priv, reg, RXCHK_CONTROL);
1933         }
1934
1935         /* Flush RX pipe */
1936         if (!priv->wolopts)
1937                 topctrl_writel(priv, RX_FLUSH, RX_FLUSH_CNTL);
1938
1939         ret = tdma_enable_set(priv, 0);
1940         if (ret) {
1941                 netdev_err(dev, "TDMA timeout!\n");
1942                 return ret;
1943         }
1944
1945         /* Wait for a packet boundary */
1946         usleep_range(2000, 3000);
1947
1948         umac_enable_set(priv, CMD_TX_EN, 0);
1949
1950         topctrl_writel(priv, TX_FLUSH, TX_FLUSH_CNTL);
1951
1952         /* Free RX/TX rings SW structures */
1953         for (i = 0; i < dev->num_tx_queues; i++)
1954                 bcm_sysport_fini_tx_ring(priv, i);
1955         bcm_sysport_fini_rx_ring(priv);
1956
1957         /* Get prepared for Wake-on-LAN */
1958         if (device_may_wakeup(d) && priv->wolopts)
1959                 ret = bcm_sysport_suspend_to_wol(priv);
1960
1961         return ret;
1962 }
1963
1964 static int bcm_sysport_resume(struct device *d)
1965 {
1966         struct net_device *dev = dev_get_drvdata(d);
1967         struct bcm_sysport_priv *priv = netdev_priv(dev);
1968         unsigned int i;
1969         u32 reg;
1970         int ret;
1971
1972         if (!netif_running(dev))
1973                 return 0;
1974
1975         umac_reset(priv);
1976
1977         /* We may have been suspended and never received a WOL event that
1978          * would turn off MPD detection, take care of that now
1979          */
1980         bcm_sysport_resume_from_wol(priv);
1981
1982         /* Initialize both hardware and software ring */
1983         for (i = 0; i < dev->num_tx_queues; i++) {
1984                 ret = bcm_sysport_init_tx_ring(priv, i);
1985                 if (ret) {
1986                         netdev_err(dev, "failed to initialize TX ring %d\n",
1987                                    i);
1988                         goto out_free_tx_rings;
1989                 }
1990         }
1991
1992         /* Initialize linked-list */
1993         tdma_writel(priv, TDMA_LL_RAM_INIT_BUSY, TDMA_STATUS);
1994
1995         /* Initialize RX ring */
1996         ret = bcm_sysport_init_rx_ring(priv);
1997         if (ret) {
1998                 netdev_err(dev, "failed to initialize RX ring\n");
1999                 goto out_free_rx_ring;
2000         }
2001
2002         netif_device_attach(dev);
2003
2004         /* RX pipe enable */
2005         topctrl_writel(priv, 0, RX_FLUSH_CNTL);
2006
2007         ret = rdma_enable_set(priv, 1);
2008         if (ret) {
2009                 netdev_err(dev, "failed to enable RDMA\n");
2010                 goto out_free_rx_ring;
2011         }
2012
2013         /* Enable rxhck */
2014         if (priv->rx_chk_en) {
2015                 reg = rxchk_readl(priv, RXCHK_CONTROL);
2016                 reg |= RXCHK_EN;
2017                 rxchk_writel(priv, reg, RXCHK_CONTROL);
2018         }
2019
2020         rbuf_init(priv);
2021
2022         /* Set maximum frame length */
2023         umac_writel(priv, UMAC_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
2024
2025         /* Set MAC address */
2026         umac_set_hw_addr(priv, dev->dev_addr);
2027
2028         umac_enable_set(priv, CMD_RX_EN, 1);
2029
2030         /* TX pipe enable */
2031         topctrl_writel(priv, 0, TX_FLUSH_CNTL);
2032
2033         umac_enable_set(priv, CMD_TX_EN, 1);
2034
2035         ret = tdma_enable_set(priv, 1);
2036         if (ret) {
2037                 netdev_err(dev, "TDMA timeout!\n");
2038                 goto out_free_rx_ring;
2039         }
2040
2041         phy_resume(priv->phydev);
2042
2043         bcm_sysport_netif_start(dev);
2044
2045         return 0;
2046
2047 out_free_rx_ring:
2048         bcm_sysport_fini_rx_ring(priv);
2049 out_free_tx_rings:
2050         for (i = 0; i < dev->num_tx_queues; i++)
2051                 bcm_sysport_fini_tx_ring(priv, i);
2052         return ret;
2053 }
2054 #endif
2055
2056 static SIMPLE_DEV_PM_OPS(bcm_sysport_pm_ops,
2057                 bcm_sysport_suspend, bcm_sysport_resume);
2058
2059 static const struct of_device_id bcm_sysport_of_match[] = {
2060         { .compatible = "brcm,systemport-v1.00" },
2061         { .compatible = "brcm,systemport" },
2062         { /* sentinel */ }
2063 };
2064
2065 static struct platform_driver bcm_sysport_driver = {
2066         .probe  = bcm_sysport_probe,
2067         .remove = bcm_sysport_remove,
2068         .driver =  {
2069                 .name = "brcm-systemport",
2070                 .of_match_table = bcm_sysport_of_match,
2071                 .pm = &bcm_sysport_pm_ops,
2072         },
2073 };
2074 module_platform_driver(bcm_sysport_driver);
2075
2076 MODULE_AUTHOR("Broadcom Corporation");
2077 MODULE_DESCRIPTION("Broadcom System Port Ethernet MAC driver");
2078 MODULE_ALIAS("platform:brcm-systemport");
2079 MODULE_LICENSE("GPL");