drivers/net/ethernet/broadcom/genet/bcmgenet.c

   1 /*
   2  * Broadcom GENET (Gigabit Ethernet) controller 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  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #define pr_fmt(fmt)                             "bcmgenet: " fmt
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/sched.h>
  25 #include <linux/types.h>
  26 #include <linux/fcntl.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/string.h>
  29 #include <linux/if_ether.h>
  30 #include <linux/init.h>
  31 #include <linux/errno.h>
  32 #include <linux/delay.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/dma-mapping.h>
  35 #include <linux/pm.h>
  36 #include <linux/clk.h>
  37 #include <linux/of.h>
  38 #include <linux/of_address.h>
  39 #include <linux/of_irq.h>
  40 #include <linux/of_net.h>
  41 #include <linux/of_platform.h>
  42 #include <net/arp.h>
  43
  44 #include <linux/mii.h>
  45 #include <linux/ethtool.h>
  46 #include <linux/netdevice.h>
  47 #include <linux/inetdevice.h>
  48 #include <linux/etherdevice.h>
  49 #include <linux/skbuff.h>
  50 #include <linux/in.h>
  51 #include <linux/ip.h>
  52 #include <linux/ipv6.h>
  53 #include <linux/phy.h>
  54
  55 #include <asm/unaligned.h>
  56
  57 #include "bcmgenet.h"
  58
  59 /* Maximum number of hardware queues, downsized if needed */
  60 #define GENET_MAX_MQ_CNT        4
  61
  62 /* Default highest priority queue for multi queue support */
  63 #define GENET_Q0_PRIORITY       0
  64
  65 #define GENET_DEFAULT_BD_CNT    \
  66         (TOTAL_DESC - priv->hw_params->tx_queues * priv->hw_params->bds_cnt)
  67
  68 #define RX_BUF_LENGTH           2048
  69 #define SKB_ALIGNMENT           32
  70
  71 /* Tx/Rx DMA register offset, skip 256 descriptors */
  72 #define WORDS_PER_BD(p)         (p->hw_params->words_per_bd)
  73 #define DMA_DESC_SIZE           (WORDS_PER_BD(priv) * sizeof(u32))
  74
  75 #define GENET_TDMA_REG_OFF      (priv->hw_params->tdma_offset + \
  76                                 TOTAL_DESC * DMA_DESC_SIZE)
  77
  78 #define GENET_RDMA_REG_OFF      (priv->hw_params->rdma_offset + \
  79                                 TOTAL_DESC * DMA_DESC_SIZE)
  80
  81 static inline void dmadesc_set_length_status(struct bcmgenet_priv *priv,
  82                                                 void __iomem *d, u32 value)
  83 {
  84         __raw_writel(value, d + DMA_DESC_LENGTH_STATUS);
  85 }
  86
  87 static inline u32 dmadesc_get_length_status(struct bcmgenet_priv *priv,
  88                                                 void __iomem *d)
  89 {
  90         return __raw_readl(d + DMA_DESC_LENGTH_STATUS);
  91 }
  92
  93 static inline void dmadesc_set_addr(struct bcmgenet_priv *priv,
  94                                     void __iomem *d,
  95                                     dma_addr_t addr)
  96 {
  97         __raw_writel(lower_32_bits(addr), d + DMA_DESC_ADDRESS_LO);
  98
  99         /* Register writes to GISB bus can take couple hundred nanoseconds
 100          * and are done for each packet, save these expensive writes unless
 101          * the platform is explicitely configured for 64-bits/LPAE.
 102          */
 103 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 104         if (priv->hw_params->flags & GENET_HAS_40BITS)
 105                 __raw_writel(upper_32_bits(addr), d + DMA_DESC_ADDRESS_HI);
 106 #endif
 107 }
 108
 109 /* Combined address + length/status setter */
 110 static inline void dmadesc_set(struct bcmgenet_priv *priv,
 111                                 void __iomem *d, dma_addr_t addr, u32 val)
 112 {
 113         dmadesc_set_length_status(priv, d, val);
 114         dmadesc_set_addr(priv, d, addr);
 115 }
 116
 117 static inline dma_addr_t dmadesc_get_addr(struct bcmgenet_priv *priv,
 118                                           void __iomem *d)
 119 {
 120         dma_addr_t addr;
 121
 122         addr = __raw_readl(d + DMA_DESC_ADDRESS_LO);
 123
 124         /* Register writes to GISB bus can take couple hundred nanoseconds
 125          * and are done for each packet, save these expensive writes unless
 126          * the platform is explicitely configured for 64-bits/LPAE.
 127          */
 128 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 129         if (priv->hw_params->flags & GENET_HAS_40BITS)
 130                 addr |= (u64)__raw_readl(d + DMA_DESC_ADDRESS_HI) << 32;
 131 #endif
 132         return addr;
 133 }
 134
 135 #define GENET_VER_FMT   "%1d.%1d EPHY: 0x%04x"
 136
 137 #define GENET_MSG_DEFAULT       (NETIF_MSG_DRV | NETIF_MSG_PROBE | \
 138                                 NETIF_MSG_LINK)
 139
 140 static inline u32 bcmgenet_rbuf_ctrl_get(struct bcmgenet_priv *priv)
 141 {
 142         if (GENET_IS_V1(priv))
 143                 return bcmgenet_rbuf_readl(priv, RBUF_FLUSH_CTRL_V1);
 144         else
 145                 return bcmgenet_sys_readl(priv, SYS_RBUF_FLUSH_CTRL);
 146 }
 147
 148 static inline void bcmgenet_rbuf_ctrl_set(struct bcmgenet_priv *priv, u32 val)
 149 {
 150         if (GENET_IS_V1(priv))
 151                 bcmgenet_rbuf_writel(priv, val, RBUF_FLUSH_CTRL_V1);
 152         else
 153                 bcmgenet_sys_writel(priv, val, SYS_RBUF_FLUSH_CTRL);
 154 }
 155
 156 /* These macros are defined to deal with register map change
 157  * between GENET1.1 and GENET2. Only those currently being used
 158  * by driver are defined.
 159  */
 160 static inline u32 bcmgenet_tbuf_ctrl_get(struct bcmgenet_priv *priv)
 161 {
 162         if (GENET_IS_V1(priv))
 163                 return bcmgenet_rbuf_readl(priv, TBUF_CTRL_V1);
 164         else
 165                 return __raw_readl(priv->base +
 166                                 priv->hw_params->tbuf_offset + TBUF_CTRL);
 167 }
 168
 169 static inline void bcmgenet_tbuf_ctrl_set(struct bcmgenet_priv *priv, u32 val)
 170 {
 171         if (GENET_IS_V1(priv))
 172                 bcmgenet_rbuf_writel(priv, val, TBUF_CTRL_V1);
 173         else
 174                 __raw_writel(val, priv->base +
 175                                 priv->hw_params->tbuf_offset + TBUF_CTRL);
 176 }
 177
 178 static inline u32 bcmgenet_bp_mc_get(struct bcmgenet_priv *priv)
 179 {
 180         if (GENET_IS_V1(priv))
 181                 return bcmgenet_rbuf_readl(priv, TBUF_BP_MC_V1);
 182         else
 183                 return __raw_readl(priv->base +
 184                                 priv->hw_params->tbuf_offset + TBUF_BP_MC);
 185 }
 186
 187 static inline void bcmgenet_bp_mc_set(struct bcmgenet_priv *priv, u32 val)
 188 {
 189         if (GENET_IS_V1(priv))
 190                 bcmgenet_rbuf_writel(priv, val, TBUF_BP_MC_V1);
 191         else
 192                 __raw_writel(val, priv->base +
 193                                 priv->hw_params->tbuf_offset + TBUF_BP_MC);
 194 }
 195
 196 /* RX/TX DMA register accessors */
 197 enum dma_reg {
 198         DMA_RING_CFG = 0,
 199         DMA_CTRL,
 200         DMA_STATUS,
 201         DMA_SCB_BURST_SIZE,
 202         DMA_ARB_CTRL,
 203         DMA_PRIORITY,
 204         DMA_RING_PRIORITY,
 205 };
 206
 207 static const u8 bcmgenet_dma_regs_v3plus[] = {
 208         [DMA_RING_CFG]          = 0x00,
 209         [DMA_CTRL]              = 0x04,
 210         [DMA_STATUS]            = 0x08,
 211         [DMA_SCB_BURST_SIZE]    = 0x0C,
 212         [DMA_ARB_CTRL]          = 0x2C,
 213         [DMA_PRIORITY]          = 0x30,
 214         [DMA_RING_PRIORITY]     = 0x38,
 215 };
 216
 217 static const u8 bcmgenet_dma_regs_v2[] = {
 218         [DMA_RING_CFG]          = 0x00,
 219         [DMA_CTRL]              = 0x04,
 220         [DMA_STATUS]            = 0x08,
 221         [DMA_SCB_BURST_SIZE]    = 0x0C,
 222         [DMA_ARB_CTRL]          = 0x30,
 223         [DMA_PRIORITY]          = 0x34,
 224         [DMA_RING_PRIORITY]     = 0x3C,
 225 };
 226
 227 static const u8 bcmgenet_dma_regs_v1[] = {
 228         [DMA_CTRL]              = 0x00,
 229         [DMA_STATUS]            = 0x04,
 230         [DMA_SCB_BURST_SIZE]    = 0x0C,
 231         [DMA_ARB_CTRL]          = 0x30,
 232         [DMA_PRIORITY]          = 0x34,
 233         [DMA_RING_PRIORITY]     = 0x3C,
 234 };
 235
 236 /* Set at runtime once bcmgenet version is known */
 237 static const u8 *bcmgenet_dma_regs;
 238
 239 static inline struct bcmgenet_priv *dev_to_priv(struct device *dev)
 240 {
 241         return netdev_priv(dev_get_drvdata(dev));
 242 }
 243
 244 static inline u32 bcmgenet_tdma_readl(struct bcmgenet_priv *priv,
 245                                         enum dma_reg r)
 246 {
 247         return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
 248                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
 249 }
 250
 251 static inline void bcmgenet_tdma_writel(struct bcmgenet_priv *priv,
 252                                         u32 val, enum dma_reg r)
 253 {
 254         __raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
 255                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
 256 }
 257
 258 static inline u32 bcmgenet_rdma_readl(struct bcmgenet_priv *priv,
 259                                         enum dma_reg r)
 260 {
 261         return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
 262                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
 263 }
 264
 265 static inline void bcmgenet_rdma_writel(struct bcmgenet_priv *priv,
 266                                         u32 val, enum dma_reg r)
 267 {
 268         __raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
 269                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
 270 }
 271
 272 /* RDMA/TDMA ring registers and accessors
 273  * we merge the common fields and just prefix with T/D the registers
 274  * having different meaning depending on the direction
 275  */
 276 enum dma_ring_reg {
 277         TDMA_READ_PTR = 0,
 278         RDMA_WRITE_PTR = TDMA_READ_PTR,
 279         TDMA_READ_PTR_HI,
 280         RDMA_WRITE_PTR_HI = TDMA_READ_PTR_HI,
 281         TDMA_CONS_INDEX,
 282         RDMA_PROD_INDEX = TDMA_CONS_INDEX,
 283         TDMA_PROD_INDEX,
 284         RDMA_CONS_INDEX = TDMA_PROD_INDEX,
 285         DMA_RING_BUF_SIZE,
 286         DMA_START_ADDR,
 287         DMA_START_ADDR_HI,
 288         DMA_END_ADDR,
 289         DMA_END_ADDR_HI,
 290         DMA_MBUF_DONE_THRESH,
 291         TDMA_FLOW_PERIOD,
 292         RDMA_XON_XOFF_THRESH = TDMA_FLOW_PERIOD,
 293         TDMA_WRITE_PTR,
 294         RDMA_READ_PTR = TDMA_WRITE_PTR,
 295         TDMA_WRITE_PTR_HI,
 296         RDMA_READ_PTR_HI = TDMA_WRITE_PTR_HI
 297 };
 298
 299 /* GENET v4 supports 40-bits pointer addressing
 300  * for obvious reasons the LO and HI word parts
 301  * are contiguous, but this offsets the other
 302  * registers.
 303  */
 304 static const u8 genet_dma_ring_regs_v4[] = {
 305         [TDMA_READ_PTR]                 = 0x00,
 306         [TDMA_READ_PTR_HI]              = 0x04,
 307         [TDMA_CONS_INDEX]               = 0x08,
 308         [TDMA_PROD_INDEX]               = 0x0C,
 309         [DMA_RING_BUF_SIZE]             = 0x10,
 310         [DMA_START_ADDR]                = 0x14,
 311         [DMA_START_ADDR_HI]             = 0x18,
 312         [DMA_END_ADDR]                  = 0x1C,
 313         [DMA_END_ADDR_HI]               = 0x20,
 314         [DMA_MBUF_DONE_THRESH]          = 0x24,
 315         [TDMA_FLOW_PERIOD]              = 0x28,
 316         [TDMA_WRITE_PTR]                = 0x2C,
 317         [TDMA_WRITE_PTR_HI]             = 0x30,
 318 };
 319
 320 static const u8 genet_dma_ring_regs_v123[] = {
 321         [TDMA_READ_PTR]                 = 0x00,
 322         [TDMA_CONS_INDEX]               = 0x04,
 323         [TDMA_PROD_INDEX]               = 0x08,
 324         [DMA_RING_BUF_SIZE]             = 0x0C,
 325         [DMA_START_ADDR]                = 0x10,
 326         [DMA_END_ADDR]                  = 0x14,
 327         [DMA_MBUF_DONE_THRESH]          = 0x18,
 328         [TDMA_FLOW_PERIOD]              = 0x1C,
 329         [TDMA_WRITE_PTR]                = 0x20,
 330 };
 331
 332 /* Set at runtime once GENET version is known */
 333 static const u8 *genet_dma_ring_regs;
 334
 335 static inline u32 bcmgenet_tdma_ring_readl(struct bcmgenet_priv *priv,
 336                                                 unsigned int ring,
 337                                                 enum dma_ring_reg r)
 338 {
 339         return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
 340                         (DMA_RING_SIZE * ring) +
 341                         genet_dma_ring_regs[r]);
 342 }
 343
 344 static inline void bcmgenet_tdma_ring_writel(struct bcmgenet_priv *priv,
 345                                                 unsigned int ring,
 346                                                 u32 val,
 347                                                 enum dma_ring_reg r)
 348 {
 349         __raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
 350                         (DMA_RING_SIZE * ring) +
 351                         genet_dma_ring_regs[r]);
 352 }
 353
 354 static inline u32 bcmgenet_rdma_ring_readl(struct bcmgenet_priv *priv,
 355                                                 unsigned int ring,
 356                                                 enum dma_ring_reg r)
 357 {
 358         return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
 359                         (DMA_RING_SIZE * ring) +
 360                         genet_dma_ring_regs[r]);
 361 }
 362
 363 static inline void bcmgenet_rdma_ring_writel(struct bcmgenet_priv *priv,
 364                                                 unsigned int ring,
 365                                                 u32 val,
 366                                                 enum dma_ring_reg r)
 367 {
 368         __raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
 369                         (DMA_RING_SIZE * ring) +
 370                         genet_dma_ring_regs[r]);
 371 }
 372
 373 static int bcmgenet_get_settings(struct net_device *dev,
 374                 struct ethtool_cmd *cmd)
 375 {
 376         struct bcmgenet_priv *priv = netdev_priv(dev);
 377
 378         if (!netif_running(dev))
 379                 return -EINVAL;
 380
 381         if (!priv->phydev)
 382                 return -ENODEV;
 383
 384         return phy_ethtool_gset(priv->phydev, cmd);
 385 }
 386
 387 static int bcmgenet_set_settings(struct net_device *dev,
 388                 struct ethtool_cmd *cmd)
 389 {
 390         struct bcmgenet_priv *priv = netdev_priv(dev);
 391
 392         if (!netif_running(dev))
 393                 return -EINVAL;
 394
 395         if (!priv->phydev)
 396                 return -ENODEV;
 397
 398         return phy_ethtool_sset(priv->phydev, cmd);
 399 }
 400
 401 static int bcmgenet_set_rx_csum(struct net_device *dev,
 402                                 netdev_features_t wanted)
 403 {
 404         struct bcmgenet_priv *priv = netdev_priv(dev);
 405         u32 rbuf_chk_ctrl;
 406         bool rx_csum_en;
 407
 408         rx_csum_en = !!(wanted & NETIF_F_RXCSUM);
 409
 410         rbuf_chk_ctrl = bcmgenet_rbuf_readl(priv, RBUF_CHK_CTRL);
 411
 412         /* enable rx checksumming */
 413         if (rx_csum_en)
 414                 rbuf_chk_ctrl |= RBUF_RXCHK_EN;
 415         else
 416                 rbuf_chk_ctrl &= ~RBUF_RXCHK_EN;
 417         priv->desc_rxchk_en = rx_csum_en;
 418
 419         /* If UniMAC forwards CRC, we need to skip over it to get
 420          * a valid CHK bit to be set in the per-packet status word
 421         */
 422         if (rx_csum_en && priv->crc_fwd_en)
 423                 rbuf_chk_ctrl |= RBUF_SKIP_FCS;
 424         else
 425                 rbuf_chk_ctrl &= ~RBUF_SKIP_FCS;
 426
 427         bcmgenet_rbuf_writel(priv, rbuf_chk_ctrl, RBUF_CHK_CTRL);
 428
 429         return 0;
 430 }
 431
 432 static int bcmgenet_set_tx_csum(struct net_device *dev,
 433                                 netdev_features_t wanted)
 434 {
 435         struct bcmgenet_priv *priv = netdev_priv(dev);
 436         bool desc_64b_en;
 437         u32 tbuf_ctrl, rbuf_ctrl;
 438
 439         tbuf_ctrl = bcmgenet_tbuf_ctrl_get(priv);
 440         rbuf_ctrl = bcmgenet_rbuf_readl(priv, RBUF_CTRL);
 441
 442         desc_64b_en = !!(wanted & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM));
 443
 444         /* enable 64 bytes descriptor in both directions (RBUF and TBUF) */
 445         if (desc_64b_en) {
 446                 tbuf_ctrl |= RBUF_64B_EN;
 447                 rbuf_ctrl |= RBUF_64B_EN;
 448         } else {
 449                 tbuf_ctrl &= ~RBUF_64B_EN;
 450                 rbuf_ctrl &= ~RBUF_64B_EN;
 451         }
 452         priv->desc_64b_en = desc_64b_en;
 453
 454         bcmgenet_tbuf_ctrl_set(priv, tbuf_ctrl);
 455         bcmgenet_rbuf_writel(priv, rbuf_ctrl, RBUF_CTRL);
 456
 457         return 0;
 458 }
 459
 460 static int bcmgenet_set_features(struct net_device *dev,
 461                 netdev_features_t features)
 462 {
 463         netdev_features_t changed = features ^ dev->features;
 464         netdev_features_t wanted = dev->wanted_features;
 465         int ret = 0;
 466
 467         if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
 468                 ret = bcmgenet_set_tx_csum(dev, wanted);
 469         if (changed & (NETIF_F_RXCSUM))
 470                 ret = bcmgenet_set_rx_csum(dev, wanted);
 471
 472         return ret;
 473 }
 474
 475 static u32 bcmgenet_get_msglevel(struct net_device *dev)
 476 {
 477         struct bcmgenet_priv *priv = netdev_priv(dev);
 478
 479         return priv->msg_enable;
 480 }
 481
 482 static void bcmgenet_set_msglevel(struct net_device *dev, u32 level)
 483 {
 484         struct bcmgenet_priv *priv = netdev_priv(dev);
 485
 486         priv->msg_enable = level;
 487 }
 488
 489 /* standard ethtool support functions. */
 490 enum bcmgenet_stat_type {
 491         BCMGENET_STAT_NETDEV = -1,
 492         BCMGENET_STAT_MIB_RX,
 493         BCMGENET_STAT_MIB_TX,
 494         BCMGENET_STAT_RUNT,
 495         BCMGENET_STAT_MISC,
 496 };
 497
 498 struct bcmgenet_stats {
 499         char stat_string[ETH_GSTRING_LEN];
 500         int stat_sizeof;
 501         int stat_offset;
 502         enum bcmgenet_stat_type type;
 503         /* reg offset from UMAC base for misc counters */
 504         u16 reg_offset;
 505 };
 506
 507 #define STAT_NETDEV(m) { \
 508         .stat_string = __stringify(m), \
 509         .stat_sizeof = sizeof(((struct net_device_stats *)0)->m), \
 510         .stat_offset = offsetof(struct net_device_stats, m), \
 511         .type = BCMGENET_STAT_NETDEV, \
 512 }
 513
 514 #define STAT_GENET_MIB(str, m, _type) { \
 515         .stat_string = str, \
 516         .stat_sizeof = sizeof(((struct bcmgenet_priv *)0)->m), \
 517         .stat_offset = offsetof(struct bcmgenet_priv, m), \
 518         .type = _type, \
 519 }
 520
 521 #define STAT_GENET_MIB_RX(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_MIB_RX)
 522 #define STAT_GENET_MIB_TX(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_MIB_TX)
 523 #define STAT_GENET_RUNT(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_RUNT)
 524
 525 #define STAT_GENET_MISC(str, m, offset) { \
 526         .stat_string = str, \
 527         .stat_sizeof = sizeof(((struct bcmgenet_priv *)0)->m), \
 528         .stat_offset = offsetof(struct bcmgenet_priv, m), \
 529         .type = BCMGENET_STAT_MISC, \
 530         .reg_offset = offset, \
 531 }
 532
 533
 534 /* There is a 0xC gap between the end of RX and beginning of TX stats and then
 535  * between the end of TX stats and the beginning of the RX RUNT
 536  */
 537 #define BCMGENET_STAT_OFFSET    0xc
 538
 539 /* Hardware counters must be kept in sync because the order/offset
 540  * is important here (order in structure declaration = order in hardware)
 541  */
 542 static const struct bcmgenet_stats bcmgenet_gstrings_stats[] = {
 543         /* general stats */
 544         STAT_NETDEV(rx_packets),
 545         STAT_NETDEV(tx_packets),
 546         STAT_NETDEV(rx_bytes),
 547         STAT_NETDEV(tx_bytes),
 548         STAT_NETDEV(rx_errors),
 549         STAT_NETDEV(tx_errors),
 550         STAT_NETDEV(rx_dropped),
 551         STAT_NETDEV(tx_dropped),
 552         STAT_NETDEV(multicast),
 553         /* UniMAC RSV counters */
 554         STAT_GENET_MIB_RX("rx_64_octets", mib.rx.pkt_cnt.cnt_64),
 555         STAT_GENET_MIB_RX("rx_65_127_oct", mib.rx.pkt_cnt.cnt_127),
 556         STAT_GENET_MIB_RX("rx_128_255_oct", mib.rx.pkt_cnt.cnt_255),
 557         STAT_GENET_MIB_RX("rx_256_511_oct", mib.rx.pkt_cnt.cnt_511),
 558         STAT_GENET_MIB_RX("rx_512_1023_oct", mib.rx.pkt_cnt.cnt_1023),
 559         STAT_GENET_MIB_RX("rx_1024_1518_oct", mib.rx.pkt_cnt.cnt_1518),
 560         STAT_GENET_MIB_RX("rx_vlan_1519_1522_oct", mib.rx.pkt_cnt.cnt_mgv),
 561         STAT_GENET_MIB_RX("rx_1522_2047_oct", mib.rx.pkt_cnt.cnt_2047),
 562         STAT_GENET_MIB_RX("rx_2048_4095_oct", mib.rx.pkt_cnt.cnt_4095),
 563         STAT_GENET_MIB_RX("rx_4096_9216_oct", mib.rx.pkt_cnt.cnt_9216),
 564         STAT_GENET_MIB_RX("rx_pkts", mib.rx.pkt),
 565         STAT_GENET_MIB_RX("rx_bytes", mib.rx.bytes),
 566         STAT_GENET_MIB_RX("rx_multicast", mib.rx.mca),
 567         STAT_GENET_MIB_RX("rx_broadcast", mib.rx.bca),
 568         STAT_GENET_MIB_RX("rx_fcs", mib.rx.fcs),
 569         STAT_GENET_MIB_RX("rx_control", mib.rx.cf),
 570         STAT_GENET_MIB_RX("rx_pause", mib.rx.pf),
 571         STAT_GENET_MIB_RX("rx_unknown", mib.rx.uo),
 572         STAT_GENET_MIB_RX("rx_align", mib.rx.aln),
 573         STAT_GENET_MIB_RX("rx_outrange", mib.rx.flr),
 574         STAT_GENET_MIB_RX("rx_code", mib.rx.cde),
 575         STAT_GENET_MIB_RX("rx_carrier", mib.rx.fcr),
 576         STAT_GENET_MIB_RX("rx_oversize", mib.rx.ovr),
 577         STAT_GENET_MIB_RX("rx_jabber", mib.rx.jbr),
 578         STAT_GENET_MIB_RX("rx_mtu_err", mib.rx.mtue),
 579         STAT_GENET_MIB_RX("rx_good_pkts", mib.rx.pok),
 580         STAT_GENET_MIB_RX("rx_unicast", mib.rx.uc),
 581         STAT_GENET_MIB_RX("rx_ppp", mib.rx.ppp),
 582         STAT_GENET_MIB_RX("rx_crc", mib.rx.rcrc),
 583         /* UniMAC TSV counters */
 584         STAT_GENET_MIB_TX("tx_64_octets", mib.tx.pkt_cnt.cnt_64),
 585         STAT_GENET_MIB_TX("tx_65_127_oct", mib.tx.pkt_cnt.cnt_127),
 586         STAT_GENET_MIB_TX("tx_128_255_oct", mib.tx.pkt_cnt.cnt_255),
 587         STAT_GENET_MIB_TX("tx_256_511_oct", mib.tx.pkt_cnt.cnt_511),
 588         STAT_GENET_MIB_TX("tx_512_1023_oct", mib.tx.pkt_cnt.cnt_1023),
 589         STAT_GENET_MIB_TX("tx_1024_1518_oct", mib.tx.pkt_cnt.cnt_1518),
 590         STAT_GENET_MIB_TX("tx_vlan_1519_1522_oct", mib.tx.pkt_cnt.cnt_mgv),
 591         STAT_GENET_MIB_TX("tx_1522_2047_oct", mib.tx.pkt_cnt.cnt_2047),
 592         STAT_GENET_MIB_TX("tx_2048_4095_oct", mib.tx.pkt_cnt.cnt_4095),
 593         STAT_GENET_MIB_TX("tx_4096_9216_oct", mib.tx.pkt_cnt.cnt_9216),
 594         STAT_GENET_MIB_TX("tx_pkts", mib.tx.pkts),
 595         STAT_GENET_MIB_TX("tx_multicast", mib.tx.mca),
 596         STAT_GENET_MIB_TX("tx_broadcast", mib.tx.bca),
 597         STAT_GENET_MIB_TX("tx_pause", mib.tx.pf),
 598         STAT_GENET_MIB_TX("tx_control", mib.tx.cf),
 599         STAT_GENET_MIB_TX("tx_fcs_err", mib.tx.fcs),
 600         STAT_GENET_MIB_TX("tx_oversize", mib.tx.ovr),
 601         STAT_GENET_MIB_TX("tx_defer", mib.tx.drf),
 602         STAT_GENET_MIB_TX("tx_excess_defer", mib.tx.edf),
 603         STAT_GENET_MIB_TX("tx_single_col", mib.tx.scl),
 604         STAT_GENET_MIB_TX("tx_multi_col", mib.tx.mcl),
 605         STAT_GENET_MIB_TX("tx_late_col", mib.tx.lcl),
 606         STAT_GENET_MIB_TX("tx_excess_col", mib.tx.ecl),
 607         STAT_GENET_MIB_TX("tx_frags", mib.tx.frg),
 608         STAT_GENET_MIB_TX("tx_total_col", mib.tx.ncl),
 609         STAT_GENET_MIB_TX("tx_jabber", mib.tx.jbr),
 610         STAT_GENET_MIB_TX("tx_bytes", mib.tx.bytes),
 611         STAT_GENET_MIB_TX("tx_good_pkts", mib.tx.pok),
 612         STAT_GENET_MIB_TX("tx_unicast", mib.tx.uc),
 613         /* UniMAC RUNT counters */
 614         STAT_GENET_RUNT("rx_runt_pkts", mib.rx_runt_cnt),
 615         STAT_GENET_RUNT("rx_runt_valid_fcs", mib.rx_runt_fcs),
 616         STAT_GENET_RUNT("rx_runt_inval_fcs_align", mib.rx_runt_fcs_align),
 617         STAT_GENET_RUNT("rx_runt_bytes", mib.rx_runt_bytes),
 618         /* Misc UniMAC counters */
 619         STAT_GENET_MISC("rbuf_ovflow_cnt", mib.rbuf_ovflow_cnt,
 620                         UMAC_RBUF_OVFL_CNT),
 621         STAT_GENET_MISC("rbuf_err_cnt", mib.rbuf_err_cnt, UMAC_RBUF_ERR_CNT),
 622         STAT_GENET_MISC("mdf_err_cnt", mib.mdf_err_cnt, UMAC_MDF_ERR_CNT),
 623 };
 624
 625 #define BCMGENET_STATS_LEN      ARRAY_SIZE(bcmgenet_gstrings_stats)
 626
 627 static void bcmgenet_get_drvinfo(struct net_device *dev,
 628                 struct ethtool_drvinfo *info)
 629 {
 630         strlcpy(info->driver, "bcmgenet", sizeof(info->driver));
 631         strlcpy(info->version, "v2.0", sizeof(info->version));
 632         info->n_stats = BCMGENET_STATS_LEN;
 633
 634 }
 635
 636 static int bcmgenet_get_sset_count(struct net_device *dev, int string_set)
 637 {
 638         switch (string_set) {
 639         case ETH_SS_STATS:
 640                 return BCMGENET_STATS_LEN;
 641         default:
 642                 return -EOPNOTSUPP;
 643         }
 644 }
 645
 646 static void bcmgenet_get_strings(struct net_device *dev,
 647                                 u32 stringset, u8 *data)
 648 {
 649         int i;
 650
 651         switch (stringset) {
 652         case ETH_SS_STATS:
 653                 for (i = 0; i < BCMGENET_STATS_LEN; i++) {
 654                         memcpy(data + i * ETH_GSTRING_LEN,
 655                                 bcmgenet_gstrings_stats[i].stat_string,
 656                                 ETH_GSTRING_LEN);
 657                 }
 658                 break;
 659         }
 660 }
 661
 662 static void bcmgenet_update_mib_counters(struct bcmgenet_priv *priv)
 663 {
 664         int i, j = 0;
 665
 666         for (i = 0; i < BCMGENET_STATS_LEN; i++) {
 667                 const struct bcmgenet_stats *s;
 668                 u8 offset = 0;
 669                 u32 val = 0;
 670                 char *p;
 671
 672                 s = &bcmgenet_gstrings_stats[i];
 673                 switch (s->type) {
 674                 case BCMGENET_STAT_NETDEV:
 675                         continue;
 676                 case BCMGENET_STAT_MIB_RX:
 677                 case BCMGENET_STAT_MIB_TX:
 678                 case BCMGENET_STAT_RUNT:
 679                         if (s->type != BCMGENET_STAT_MIB_RX)
 680                                 offset = BCMGENET_STAT_OFFSET;
 681                         val = bcmgenet_umac_readl(priv, UMAC_MIB_START +
 682                                                                 j + offset);
 683                         break;
 684                 case BCMGENET_STAT_MISC:
 685                         val = bcmgenet_umac_readl(priv, s->reg_offset);
 686                         /* clear if overflowed */
 687                         if (val == ~0)
 688                                 bcmgenet_umac_writel(priv, 0, s->reg_offset);
 689                         break;
 690                 }
 691
 692                 j += s->stat_sizeof;
 693                 p = (char *)priv + s->stat_offset;
 694                 *(u32 *)p = val;
 695         }
 696 }
 697
 698 static void bcmgenet_get_ethtool_stats(struct net_device *dev,
 699                                         struct ethtool_stats *stats,
 700                                         u64 *data)
 701 {
 702         struct bcmgenet_priv *priv = netdev_priv(dev);
 703         int i;
 704
 705         if (netif_running(dev))
 706                 bcmgenet_update_mib_counters(priv);
 707
 708         for (i = 0; i < BCMGENET_STATS_LEN; i++) {
 709                 const struct bcmgenet_stats *s;
 710                 char *p;
 711
 712                 s = &bcmgenet_gstrings_stats[i];
 713                 if (s->type == BCMGENET_STAT_NETDEV)
 714                         p = (char *)&dev->stats;
 715                 else
 716                         p = (char *)priv;
 717                 p += s->stat_offset;
 718                 data[i] = *(u32 *)p;
 719         }
 720 }
 721
 722 /* standard ethtool support functions. */
 723 static struct ethtool_ops bcmgenet_ethtool_ops = {
 724         .get_strings            = bcmgenet_get_strings,
 725         .get_sset_count         = bcmgenet_get_sset_count,
 726         .get_ethtool_stats      = bcmgenet_get_ethtool_stats,
 727         .get_settings           = bcmgenet_get_settings,
 728         .set_settings           = bcmgenet_set_settings,
 729         .get_drvinfo            = bcmgenet_get_drvinfo,
 730         .get_link               = ethtool_op_get_link,
 731         .get_msglevel           = bcmgenet_get_msglevel,
 732         .set_msglevel           = bcmgenet_set_msglevel,
 733 };
 734
 735 /* Power down the unimac, based on mode. */
 736 static void bcmgenet_power_down(struct bcmgenet_priv *priv,
 737                                 enum bcmgenet_power_mode mode)
 738 {
 739         u32 reg;
 740
 741         switch (mode) {
 742         case GENET_POWER_CABLE_SENSE:
 743                 phy_detach(priv->phydev);
 744                 break;
 745
 746         case GENET_POWER_PASSIVE:
 747                 /* Power down LED */
 748                 bcmgenet_mii_reset(priv->dev);
 749                 if (priv->hw_params->flags & GENET_HAS_EXT) {
 750                         reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
 751                         reg |= (EXT_PWR_DOWN_PHY |
 752                                 EXT_PWR_DOWN_DLL | EXT_PWR_DOWN_BIAS);
 753                         bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
 754                 }
 755                 break;
 756         default:
 757                 break;
 758         }
 759 }
 760
 761 static void bcmgenet_power_up(struct bcmgenet_priv *priv,
 762                                 enum bcmgenet_power_mode mode)
 763 {
 764         u32 reg;
 765
 766         if (!(priv->hw_params->flags & GENET_HAS_EXT))
 767                 return;
 768
 769         reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
 770
 771         switch (mode) {
 772         case GENET_POWER_PASSIVE:
 773                 reg &= ~(EXT_PWR_DOWN_DLL | EXT_PWR_DOWN_PHY |
 774                                 EXT_PWR_DOWN_BIAS);
 775                 /* fallthrough */
 776         case GENET_POWER_CABLE_SENSE:
 777                 /* enable APD */
 778                 reg |= EXT_PWR_DN_EN_LD;
 779                 break;
 780         default:
 781                 break;
 782         }
 783
 784         bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
 785         bcmgenet_mii_reset(priv->dev);
 786 }
 787
 788 /* ioctl handle special commands that are not present in ethtool. */
 789 static int bcmgenet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 790 {
 791         struct bcmgenet_priv *priv = netdev_priv(dev);
 792         int val = 0;
 793
 794         if (!netif_running(dev))
 795                 return -EINVAL;
 796
 797         switch (cmd) {
 798         case SIOCGMIIPHY:
 799         case SIOCGMIIREG:
 800         case SIOCSMIIREG:
 801                 if (!priv->phydev)
 802                         val = -ENODEV;
 803                 else
 804                         val = phy_mii_ioctl(priv->phydev, rq, cmd);
 805                 break;
 806
 807         default:
 808                 val = -EINVAL;
 809                 break;
 810         }
 811
 812         return val;
 813 }
 814
 815 static struct enet_cb *bcmgenet_get_txcb(struct bcmgenet_priv *priv,
 816                                          struct bcmgenet_tx_ring *ring)
 817 {
 818         struct enet_cb *tx_cb_ptr;
 819
 820         tx_cb_ptr = ring->cbs;
 821         tx_cb_ptr += ring->write_ptr - ring->cb_ptr;
 822         tx_cb_ptr->bd_addr = priv->tx_bds + ring->write_ptr * DMA_DESC_SIZE;
 823         /* Advancing local write pointer */
 824         if (ring->write_ptr == ring->end_ptr)
 825                 ring->write_ptr = ring->cb_ptr;
 826         else
 827                 ring->write_ptr++;
 828
 829         return tx_cb_ptr;
 830 }
 831
 832 /* Simple helper to free a control block's resources */
 833 static void bcmgenet_free_cb(struct enet_cb *cb)
 834 {
 835         dev_kfree_skb_any(cb->skb);
 836         cb->skb = NULL;
 837         dma_unmap_addr_set(cb, dma_addr, 0);
 838 }
 839
 840 static inline void bcmgenet_tx_ring16_int_disable(struct bcmgenet_priv *priv,
 841                                                   struct bcmgenet_tx_ring *ring)
 842 {
 843         bcmgenet_intrl2_0_writel(priv,
 844                         UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE,
 845                         INTRL2_CPU_MASK_SET);
 846 }
 847
 848 static inline void bcmgenet_tx_ring16_int_enable(struct bcmgenet_priv *priv,
 849                                                  struct bcmgenet_tx_ring *ring)
 850 {
 851         bcmgenet_intrl2_0_writel(priv,
 852                         UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE,
 853                         INTRL2_CPU_MASK_CLEAR);
 854 }
 855
 856 static inline void bcmgenet_tx_ring_int_enable(struct bcmgenet_priv *priv,
 857                                                 struct bcmgenet_tx_ring *ring)
 858 {
 859         bcmgenet_intrl2_1_writel(priv,
 860                         (1 << ring->index), INTRL2_CPU_MASK_CLEAR);
 861         priv->int1_mask &= ~(1 << ring->index);
 862 }
 863
 864 static inline void bcmgenet_tx_ring_int_disable(struct bcmgenet_priv *priv,
 865                                                 struct bcmgenet_tx_ring *ring)
 866 {
 867         bcmgenet_intrl2_1_writel(priv,
 868                         (1 << ring->index), INTRL2_CPU_MASK_SET);
 869         priv->int1_mask |= (1 << ring->index);
 870 }
 871
 872 /* Unlocked version of the reclaim routine */
 873 static void __bcmgenet_tx_reclaim(struct net_device *dev,
 874                                 struct bcmgenet_tx_ring *ring)
 875 {
 876         struct bcmgenet_priv *priv = netdev_priv(dev);
 877         int last_tx_cn, last_c_index, num_tx_bds;
 878         struct enet_cb *tx_cb_ptr;
 879         struct netdev_queue *txq;
 880         unsigned int c_index;
 881
 882         /* Compute how many buffers are transmited since last xmit call */
 883         c_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_CONS_INDEX);
 884         txq = netdev_get_tx_queue(dev, ring->queue);
 885
 886         last_c_index = ring->c_index;
 887         num_tx_bds = ring->size;
 888
 889         c_index &= (num_tx_bds - 1);
 890
 891         if (c_index >= last_c_index)
 892                 last_tx_cn = c_index - last_c_index;
 893         else
 894                 last_tx_cn = num_tx_bds - last_c_index + c_index;
 895
 896         netif_dbg(priv, tx_done, dev,
 897                         "%s ring=%d index=%d last_tx_cn=%d last_index=%d\n",
 898                         __func__, ring->index,
 899                         c_index, last_tx_cn, last_c_index);
 900
 901         /* Reclaim transmitted buffers */
 902         while (last_tx_cn-- > 0) {
 903                 tx_cb_ptr = ring->cbs + last_c_index;
 904                 if (tx_cb_ptr->skb) {
 905                         dev->stats.tx_bytes += tx_cb_ptr->skb->len;
 906                         dma_unmap_single(&dev->dev,
 907                                         dma_unmap_addr(tx_cb_ptr, dma_addr),
 908                                         tx_cb_ptr->skb->len,
 909                                         DMA_TO_DEVICE);
 910                         bcmgenet_free_cb(tx_cb_ptr);
 911                 } else if (dma_unmap_addr(tx_cb_ptr, dma_addr)) {
 912                         dev->stats.tx_bytes +=
 913                                 dma_unmap_len(tx_cb_ptr, dma_len);
 914                         dma_unmap_page(&dev->dev,
 915                                         dma_unmap_addr(tx_cb_ptr, dma_addr),
 916                                         dma_unmap_len(tx_cb_ptr, dma_len),
 917                                         DMA_TO_DEVICE);
 918                         dma_unmap_addr_set(tx_cb_ptr, dma_addr, 0);
 919                 }
 920                 dev->stats.tx_packets++;
 921                 ring->free_bds += 1;
 922
 923                 last_c_index++;
 924                 last_c_index &= (num_tx_bds - 1);
 925         }
 926
 927         if (ring->free_bds > (MAX_SKB_FRAGS + 1))
 928                 ring->int_disable(priv, ring);
 929
 930         if (netif_tx_queue_stopped(txq))
 931                 netif_tx_wake_queue(txq);
 932
 933         ring->c_index = c_index;
 934 }
 935
 936 static void bcmgenet_tx_reclaim(struct net_device *dev,
 937                 struct bcmgenet_tx_ring *ring)
 938 {
 939         unsigned long flags;
 940
 941         spin_lock_irqsave(&ring->lock, flags);
 942         __bcmgenet_tx_reclaim(dev, ring);
 943         spin_unlock_irqrestore(&ring->lock, flags);
 944 }
 945
 946 static void bcmgenet_tx_reclaim_all(struct net_device *dev)
 947 {
 948         struct bcmgenet_priv *priv = netdev_priv(dev);
 949         int i;
 950
 951         if (netif_is_multiqueue(dev)) {
 952                 for (i = 0; i < priv->hw_params->tx_queues; i++)
 953                         bcmgenet_tx_reclaim(dev, &priv->tx_rings[i]);
 954         }
 955
 956         bcmgenet_tx_reclaim(dev, &priv->tx_rings[DESC_INDEX]);
 957 }
 958
 959 /* Transmits a single SKB (either head of a fragment or a single SKB)
 960  * caller must hold priv->lock
 961  */
 962 static int bcmgenet_xmit_single(struct net_device *dev,
 963                                 struct sk_buff *skb,
 964                                 u16 dma_desc_flags,
 965                                 struct bcmgenet_tx_ring *ring)
 966 {
 967         struct bcmgenet_priv *priv = netdev_priv(dev);
 968         struct device *kdev = &priv->pdev->dev;
 969         struct enet_cb *tx_cb_ptr;
 970         unsigned int skb_len;
 971         dma_addr_t mapping;
 972         u32 length_status;
 973         int ret;
 974
 975         tx_cb_ptr = bcmgenet_get_txcb(priv, ring);
 976
 977         if (unlikely(!tx_cb_ptr))
 978                 BUG();
 979
 980         tx_cb_ptr->skb = skb;
 981
 982         skb_len = skb_headlen(skb) < ETH_ZLEN ? ETH_ZLEN : skb_headlen(skb);
 983
 984         mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
 985         ret = dma_mapping_error(kdev, mapping);
 986         if (ret) {
 987                 netif_err(priv, tx_err, dev, "Tx DMA map failed\n");
 988                 dev_kfree_skb(skb);
 989                 return ret;
 990         }
 991
 992         dma_unmap_addr_set(tx_cb_ptr, dma_addr, mapping);
 993         dma_unmap_len_set(tx_cb_ptr, dma_len, skb->len);
 994         length_status = (skb_len << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
 995                         (priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT) |
 996                         DMA_TX_APPEND_CRC;
 997
 998         if (skb->ip_summed == CHECKSUM_PARTIAL)
 999                 length_status |= DMA_TX_DO_CSUM;
1000
1001         dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping, length_status);
1002
1003         /* Decrement total BD count and advance our write pointer */
1004         ring->free_bds -= 1;
1005         ring->prod_index += 1;
1006         ring->prod_index &= DMA_P_INDEX_MASK;
1007
1008         return 0;
1009 }
1010
1011 /* Transmit a SKB fragement */
1012 static int bcmgenet_xmit_frag(struct net_device *dev,
1013                                 skb_frag_t *frag,
1014                                 u16 dma_desc_flags,
1015                                 struct bcmgenet_tx_ring *ring)
1016 {
1017         struct bcmgenet_priv *priv = netdev_priv(dev);
1018         struct device *kdev = &priv->pdev->dev;
1019         struct enet_cb *tx_cb_ptr;
1020         dma_addr_t mapping;
1021         int ret;
1022
1023         tx_cb_ptr = bcmgenet_get_txcb(priv, ring);
1024
1025         if (unlikely(!tx_cb_ptr))
1026                 BUG();
1027         tx_cb_ptr->skb = NULL;
1028
1029         mapping = skb_frag_dma_map(kdev, frag, 0,
1030                 skb_frag_size(frag), DMA_TO_DEVICE);
1031         ret = dma_mapping_error(kdev, mapping);
1032         if (ret) {
1033                 netif_err(priv, tx_err, dev, "%s: Tx DMA map failed\n",
1034                                 __func__);
1035                 return ret;
1036         }
1037
1038         dma_unmap_addr_set(tx_cb_ptr, dma_addr, mapping);
1039         dma_unmap_len_set(tx_cb_ptr, dma_len, frag->size);
1040
1041         dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping,
1042                         (frag->size << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
1043                         (priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT));
1044
1045
1046         ring->free_bds -= 1;
1047         ring->prod_index += 1;
1048         ring->prod_index &= DMA_P_INDEX_MASK;
1049
1050         return 0;
1051 }
1052
1053 /* Reallocate the SKB to put enough headroom in front of it and insert
1054  * the transmit checksum offsets in the descriptors
1055  */
1056 static int bcmgenet_put_tx_csum(struct net_device *dev, struct sk_buff *skb)
1057 {
1058         struct status_64 *status = NULL;
1059         struct sk_buff *new_skb;
1060         u16 offset;
1061         u8 ip_proto;
1062         u16 ip_ver;
1063         u32 tx_csum_info;
1064
1065         if (unlikely(skb_headroom(skb) < sizeof(*status))) {
1066                 /* If 64 byte status block enabled, must make sure skb has
1067                  * enough headroom for us to insert 64B status block.
1068                  */
1069                 new_skb = skb_realloc_headroom(skb, sizeof(*status));
1070                 dev_kfree_skb(skb);
1071                 if (!new_skb) {
1072                         dev->stats.tx_errors++;
1073                         dev->stats.tx_dropped++;
1074                         return -ENOMEM;
1075                 }
1076                 skb = new_skb;
1077         }
1078
1079         skb_push(skb, sizeof(*status));
1080         status = (struct status_64 *)skb->data;
1081
1082         if (skb->ip_summed  == CHECKSUM_PARTIAL) {
1083                 ip_ver = htons(skb->protocol);
1084                 switch (ip_ver) {
1085                 case ETH_P_IP:
1086                         ip_proto = ip_hdr(skb)->protocol;
1087                         break;
1088                 case ETH_P_IPV6:
1089                         ip_proto = ipv6_hdr(skb)->nexthdr;
1090                         break;
1091                 default:
1092                         return 0;
1093                 }
1094
1095                 offset = skb_checksum_start_offset(skb) - sizeof(*status);
1096                 tx_csum_info = (offset << STATUS_TX_CSUM_START_SHIFT) |
1097                                 (offset + skb->csum_offset);
1098
1099                 /* Set the length valid bit for TCP and UDP and just set
1100                  * the special UDP flag for IPv4, else just set to 0.
1101                  */
1102                 if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
1103                         tx_csum_info |= STATUS_TX_CSUM_LV;
1104                         if (ip_proto == IPPROTO_UDP && ip_ver == ETH_P_IP)
1105                                 tx_csum_info |= STATUS_TX_CSUM_PROTO_UDP;
1106                 } else
1107                         tx_csum_info = 0;
1108
1109                 status->tx_csum_info = tx_csum_info;
1110         }
1111
1112         return 0;
1113 }
1114
1115 static netdev_tx_t bcmgenet_xmit(struct sk_buff *skb, struct net_device *dev)
1116 {
1117         struct bcmgenet_priv *priv = netdev_priv(dev);
1118         struct bcmgenet_tx_ring *ring = NULL;
1119         struct netdev_queue *txq;
1120         unsigned long flags = 0;
1121         int nr_frags, index;
1122         u16 dma_desc_flags;
1123         int ret;
1124         int i;
1125
1126         index = skb_get_queue_mapping(skb);
1127         /* Mapping strategy:
1128          * queue_mapping = 0, unclassified, packet xmited through ring16
1129          * queue_mapping = 1, goes to ring 0. (highest priority queue
1130          * queue_mapping = 2, goes to ring 1.
1131          * queue_mapping = 3, goes to ring 2.
1132          * queue_mapping = 4, goes to ring 3.
1133          */
1134         if (index == 0)
1135                 index = DESC_INDEX;
1136         else
1137                 index -= 1;
1138
1139         nr_frags = skb_shinfo(skb)->nr_frags;
1140         ring = &priv->tx_rings[index];
1141         txq = netdev_get_tx_queue(dev, ring->queue);
1142
1143         spin_lock_irqsave(&ring->lock, flags);
1144         if (ring->free_bds <= nr_frags + 1) {
1145                 netif_tx_stop_queue(txq);
1146                 netdev_err(dev, "%s: tx ring %d full when queue %d awake\n",
1147                                 __func__, index, ring->queue);
1148                 ret = NETDEV_TX_BUSY;
1149                 goto out;
1150         }
1151
1152         /* set the SKB transmit checksum */
1153         if (priv->desc_64b_en) {
1154                 ret = bcmgenet_put_tx_csum(dev, skb);
1155                 if (ret) {
1156                         ret = NETDEV_TX_OK;
1157                         goto out;
1158                 }
1159         }
1160
1161         dma_desc_flags = DMA_SOP;
1162         if (nr_frags == 0)
1163                 dma_desc_flags |= DMA_EOP;
1164
1165         /* Transmit single SKB or head of fragment list */
1166         ret = bcmgenet_xmit_single(dev, skb, dma_desc_flags, ring);
1167         if (ret) {
1168                 ret = NETDEV_TX_OK;
1169                 goto out;
1170         }
1171
1172         /* xmit fragment */
1173         for (i = 0; i < nr_frags; i++) {
1174                 ret = bcmgenet_xmit_frag(dev,
1175                                 &skb_shinfo(skb)->frags[i],
1176                                 (i == nr_frags - 1) ? DMA_EOP : 0, ring);
1177                 if (ret) {
1178                         ret = NETDEV_TX_OK;
1179                         goto out;
1180                 }
1181         }
1182
1183         skb_tx_timestamp(skb);
1184
1185         /* we kept a software copy of how much we should advance the TDMA
1186          * producer index, now write it down to the hardware
1187          */
1188         bcmgenet_tdma_ring_writel(priv, ring->index,
1189                         ring->prod_index, TDMA_PROD_INDEX);
1190
1191         if (ring->free_bds <= (MAX_SKB_FRAGS + 1)) {
1192                 netif_tx_stop_queue(txq);
1193                 ring->int_enable(priv, ring);
1194         }
1195
1196 out:
1197         spin_unlock_irqrestore(&ring->lock, flags);
1198
1199         return ret;
1200 }
1201
1202
1203 static int bcmgenet_rx_refill(struct bcmgenet_priv *priv,
1204                                 struct enet_cb *cb)
1205 {
1206         struct device *kdev = &priv->pdev->dev;
1207         struct sk_buff *skb;
1208         dma_addr_t mapping;
1209         int ret;
1210
1211         skb = netdev_alloc_skb(priv->dev,
1212                                 priv->rx_buf_len + SKB_ALIGNMENT);
1213         if (!skb)
1214                 return -ENOMEM;
1215
1216         /* a caller did not release this control block */
1217         WARN_ON(cb->skb != NULL);
1218         cb->skb = skb;
1219         mapping = dma_map_single(kdev, skb->data,
1220                         priv->rx_buf_len, DMA_FROM_DEVICE);
1221         ret = dma_mapping_error(kdev, mapping);
1222         if (ret) {
1223                 bcmgenet_free_cb(cb);
1224                 netif_err(priv, rx_err, priv->dev,
1225                                 "%s DMA map failed\n", __func__);
1226                 return ret;
1227         }
1228
1229         dma_unmap_addr_set(cb, dma_addr, mapping);
1230         /* assign packet, prepare descriptor, and advance pointer */
1231
1232         dmadesc_set_addr(priv, priv->rx_bd_assign_ptr, mapping);
1233
1234         /* turn on the newly assigned BD for DMA to use */
1235         priv->rx_bd_assign_index++;
1236         priv->rx_bd_assign_index &= (priv->num_rx_bds - 1);
1237
1238         priv->rx_bd_assign_ptr = priv->rx_bds +
1239                 (priv->rx_bd_assign_index * DMA_DESC_SIZE);
1240
1241         return 0;
1242 }
1243
1244 /* bcmgenet_desc_rx - descriptor based rx process.
1245  * this could be called from bottom half, or from NAPI polling method.
1246  */
1247 static unsigned int bcmgenet_desc_rx(struct bcmgenet_priv *priv,
1248                                      unsigned int budget)
1249 {
1250         struct net_device *dev = priv->dev;
1251         struct enet_cb *cb;
1252         struct sk_buff *skb;
1253         u32 dma_length_status;
1254         unsigned long dma_flag;
1255         int len, err;
1256         unsigned int rxpktprocessed = 0, rxpkttoprocess;
1257         unsigned int p_index;
1258         unsigned int chksum_ok = 0;
1259
1260         p_index = bcmgenet_rdma_ring_readl(priv,
1261                         DESC_INDEX, RDMA_PROD_INDEX);
1262         p_index &= DMA_P_INDEX_MASK;
1263
1264         if (p_index < priv->rx_c_index)
1265                 rxpkttoprocess = (DMA_C_INDEX_MASK + 1) -
1266                         priv->rx_c_index + p_index;
1267         else
1268                 rxpkttoprocess = p_index - priv->rx_c_index;
1269
1270         netif_dbg(priv, rx_status, dev,
1271                 "RDMA: rxpkttoprocess=%d\n", rxpkttoprocess);
1272
1273         while ((rxpktprocessed < rxpkttoprocess) &&
1274                         (rxpktprocessed < budget)) {
1275
1276                 /* Unmap the packet contents such that we can use the
1277                  * RSV from the 64 bytes descriptor when enabled and save
1278                  * a 32-bits register read
1279                  */
1280                 cb = &priv->rx_cbs[priv->rx_read_ptr];
1281                 skb = cb->skb;
1282                 dma_unmap_single(&dev->dev, dma_unmap_addr(cb, dma_addr),
1283                                 priv->rx_buf_len, DMA_FROM_DEVICE);
1284
1285                 if (!priv->desc_64b_en) {
1286                         dma_length_status = dmadesc_get_length_status(priv,
1287                                                         priv->rx_bds +
1288                                                         (priv->rx_read_ptr *
1289                                                          DMA_DESC_SIZE));
1290                 } else {
1291                         struct status_64 *status;
1292                         status = (struct status_64 *)skb->data;
1293                         dma_length_status = status->length_status;
1294                 }
1295
1296                 /* DMA flags and length are still valid no matter how
1297                  * we got the Receive Status Vector (64B RSB or register)
1298                  */
1299                 dma_flag = dma_length_status & 0xffff;
1300                 len = dma_length_status >> DMA_BUFLENGTH_SHIFT;
1301
1302                 netif_dbg(priv, rx_status, dev,
1303                         "%s: p_ind=%d c_ind=%d read_ptr=%d len_stat=0x%08x\n",
1304                         __func__, p_index, priv->rx_c_index, priv->rx_read_ptr,
1305                         dma_length_status);
1306
1307                 rxpktprocessed++;
1308
1309                 priv->rx_read_ptr++;
1310                 priv->rx_read_ptr &= (priv->num_rx_bds - 1);
1311
1312                 /* out of memory, just drop packets at the hardware level */
1313                 if (unlikely(!skb)) {
1314                         dev->stats.rx_dropped++;
1315                         dev->stats.rx_errors++;
1316                         goto refill;
1317                 }
1318
1319                 if (unlikely(!(dma_flag & DMA_EOP) || !(dma_flag & DMA_SOP))) {
1320                         netif_err(priv, rx_status, dev,
1321                                         "Droping fragmented packet!\n");
1322                         dev->stats.rx_dropped++;
1323                         dev->stats.rx_errors++;
1324                         dev_kfree_skb_any(cb->skb);
1325                         cb->skb = NULL;
1326                         goto refill;
1327                 }
1328                 /* report errors */
1329                 if (unlikely(dma_flag & (DMA_RX_CRC_ERROR |
1330                                                 DMA_RX_OV |
1331                                                 DMA_RX_NO |
1332                                                 DMA_RX_LG |
1333                                                 DMA_RX_RXER))) {
1334                         netif_err(priv, rx_status, dev, "dma_flag=0x%x\n",
1335                                                 (unsigned int)dma_flag);
1336                         if (dma_flag & DMA_RX_CRC_ERROR)
1337                                 dev->stats.rx_crc_errors++;
1338                         if (dma_flag & DMA_RX_OV)
1339                                 dev->stats.rx_over_errors++;
1340                         if (dma_flag & DMA_RX_NO)
1341                                 dev->stats.rx_frame_errors++;
1342                         if (dma_flag & DMA_RX_LG)
1343                                 dev->stats.rx_length_errors++;
1344                         dev->stats.rx_dropped++;
1345                         dev->stats.rx_errors++;
1346
1347                         /* discard the packet and advance consumer index.*/
1348                         dev_kfree_skb_any(cb->skb);
1349                         cb->skb = NULL;
1350                         goto refill;
1351                 } /* error packet */
1352
1353                 chksum_ok = (dma_flag & priv->dma_rx_chk_bit) &&
1354                                 priv->desc_rxchk_en;
1355
1356                 skb_put(skb, len);
1357                 if (priv->desc_64b_en) {
1358                         skb_pull(skb, 64);
1359                         len -= 64;
1360                 }
1361
1362                 if (likely(chksum_ok))
1363                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1364
1365                 /* remove hardware 2bytes added for IP alignment */
1366                 skb_pull(skb, 2);
1367                 len -= 2;
1368
1369                 if (priv->crc_fwd_en) {
1370                         skb_trim(skb, len - ETH_FCS_LEN);
1371                         len -= ETH_FCS_LEN;
1372                 }
1373
1374                 /*Finish setting up the received SKB and send it to the kernel*/
1375                 skb->protocol = eth_type_trans(skb, priv->dev);
1376                 dev->stats.rx_packets++;
1377                 dev->stats.rx_bytes += len;
1378                 if (dma_flag & DMA_RX_MULT)
1379                         dev->stats.multicast++;
1380
1381                 /* Notify kernel */
1382                 napi_gro_receive(&priv->napi, skb);
1383                 cb->skb = NULL;
1384                 netif_dbg(priv, rx_status, dev, "pushed up to kernel\n");
1385
1386                 /* refill RX path on the current control block */
1387 refill:
1388                 err = bcmgenet_rx_refill(priv, cb);
1389                 if (err)
1390                         netif_err(priv, rx_err, dev, "Rx refill failed\n");
1391         }
1392
1393         return rxpktprocessed;
1394 }
1395
1396 /* Assign skb to RX DMA descriptor. */
1397 static int bcmgenet_alloc_rx_buffers(struct bcmgenet_priv *priv)
1398 {
1399         struct enet_cb *cb;
1400         int ret = 0;
1401         int i;
1402
1403         netif_dbg(priv, hw, priv->dev, "%s:\n", __func__);
1404
1405         /* loop here for each buffer needing assign */
1406         for (i = 0; i < priv->num_rx_bds; i++) {
1407                 cb = &priv->rx_cbs[priv->rx_bd_assign_index];
1408                 if (cb->skb)
1409                         continue;
1410
1411                 ret = bcmgenet_rx_refill(priv, cb);
1412                 if (ret)
1413                         break;
1414
1415         }
1416
1417         return ret;
1418 }
1419
1420 static void bcmgenet_free_rx_buffers(struct bcmgenet_priv *priv)
1421 {
1422         struct enet_cb *cb;
1423         int i;
1424
1425         for (i = 0; i < priv->num_rx_bds; i++) {
1426                 cb = &priv->rx_cbs[i];
1427
1428                 if (dma_unmap_addr(cb, dma_addr)) {
1429                         dma_unmap_single(&priv->dev->dev,
1430                                         dma_unmap_addr(cb, dma_addr),
1431                                         priv->rx_buf_len, DMA_FROM_DEVICE);
1432                         dma_unmap_addr_set(cb, dma_addr, 0);
1433                 }
1434
1435                 if (cb->skb)
1436                         bcmgenet_free_cb(cb);
1437         }
1438 }
1439
1440 static int reset_umac(struct bcmgenet_priv *priv)
1441 {
1442         struct device *kdev = &priv->pdev->dev;
1443         unsigned int timeout = 0;
1444         u32 reg;
1445
1446         /* 7358a0/7552a0: bad default in RBUF_FLUSH_CTRL.umac_sw_rst */
1447         bcmgenet_rbuf_ctrl_set(priv, 0);
1448         udelay(10);
1449
1450         /* disable MAC while updating its registers */
1451         bcmgenet_umac_writel(priv, 0, UMAC_CMD);
1452
1453         /* issue soft reset, wait for it to complete */
1454         bcmgenet_umac_writel(priv, CMD_SW_RESET, UMAC_CMD);
1455         while (timeout++ < 1000) {
1456                 reg = bcmgenet_umac_readl(priv, UMAC_CMD);
1457                 if (!(reg & CMD_SW_RESET))
1458                         return 0;
1459
1460                 udelay(1);
1461         }
1462
1463         if (timeout == 1000) {
1464                 dev_err(kdev,
1465                         "timeout waiting for MAC to come out of resetn\n");
1466                 return -ETIMEDOUT;
1467         }
1468
1469         return 0;
1470 }
1471
1472 static int init_umac(struct bcmgenet_priv *priv)
1473 {
1474         struct device *kdev = &priv->pdev->dev;
1475         int ret;
1476         u32 reg, cpu_mask_clear;
1477
1478         dev_dbg(&priv->pdev->dev, "bcmgenet: init_umac\n");
1479
1480         ret = reset_umac(priv);
1481         if (ret)
1482                 return ret;
1483
1484         bcmgenet_umac_writel(priv, 0, UMAC_CMD);
1485         /* clear tx/rx counter */
1486         bcmgenet_umac_writel(priv,
1487                 MIB_RESET_RX | MIB_RESET_TX | MIB_RESET_RUNT, UMAC_MIB_CTRL);
1488         bcmgenet_umac_writel(priv, 0, UMAC_MIB_CTRL);
1489
1490         bcmgenet_umac_writel(priv, ENET_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
1491
1492         /* init rx registers, enable ip header optimization */
1493         reg = bcmgenet_rbuf_readl(priv, RBUF_CTRL);
1494         reg |= RBUF_ALIGN_2B;
1495         bcmgenet_rbuf_writel(priv, reg, RBUF_CTRL);
1496
1497         if (!GENET_IS_V1(priv) && !GENET_IS_V2(priv))
1498                 bcmgenet_rbuf_writel(priv, 1, RBUF_TBUF_SIZE_CTRL);
1499
1500         /* Mask all interrupts.*/
1501         bcmgenet_intrl2_0_writel(priv, 0xFFFFFFFF, INTRL2_CPU_MASK_SET);
1502         bcmgenet_intrl2_0_writel(priv, 0xFFFFFFFF, INTRL2_CPU_CLEAR);
1503         bcmgenet_intrl2_0_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1504
1505         cpu_mask_clear = UMAC_IRQ_RXDMA_BDONE;
1506
1507         dev_dbg(kdev, "%s:Enabling RXDMA_BDONE interrupt\n", __func__);
1508
1509         /* Monitor cable plug/unpluged event for internal PHY */
1510         if (phy_is_internal(priv->phydev))
1511                 cpu_mask_clear |= (UMAC_IRQ_LINK_DOWN | UMAC_IRQ_LINK_UP);
1512         else if (priv->ext_phy)
1513                 cpu_mask_clear |= (UMAC_IRQ_LINK_DOWN | UMAC_IRQ_LINK_UP);
1514         else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
1515                 reg = bcmgenet_bp_mc_get(priv);
1516                 reg |= BIT(priv->hw_params->bp_in_en_shift);
1517
1518                 /* bp_mask: back pressure mask */
1519                 if (netif_is_multiqueue(priv->dev))
1520                         reg |= priv->hw_params->bp_in_mask;
1521                 else
1522                         reg &= ~priv->hw_params->bp_in_mask;
1523                 bcmgenet_bp_mc_set(priv, reg);
1524         }
1525
1526         /* Enable MDIO interrupts on GENET v3+ */
1527         if (priv->hw_params->flags & GENET_HAS_MDIO_INTR)
1528                 cpu_mask_clear |= UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR;
1529
1530         bcmgenet_intrl2_0_writel(priv, cpu_mask_clear,
1531                 INTRL2_CPU_MASK_CLEAR);
1532
1533         /* Enable rx/tx engine.*/
1534         dev_dbg(kdev, "done init umac\n");
1535
1536         return 0;
1537 }
1538
1539 /* Initialize all house-keeping variables for a TX ring, along
1540  * with corresponding hardware registers
1541  */
1542 static void bcmgenet_init_tx_ring(struct bcmgenet_priv *priv,
1543                                   unsigned int index, unsigned int size,
1544                                   unsigned int write_ptr, unsigned int end_ptr)
1545 {
1546         struct bcmgenet_tx_ring *ring = &priv->tx_rings[index];
1547         u32 words_per_bd = WORDS_PER_BD(priv);
1548         u32 flow_period_val = 0;
1549         unsigned int first_bd;
1550
1551         spin_lock_init(&ring->lock);
1552         ring->index = index;
1553         if (index == DESC_INDEX) {
1554                 ring->queue = 0;
1555                 ring->int_enable = bcmgenet_tx_ring16_int_enable;
1556                 ring->int_disable = bcmgenet_tx_ring16_int_disable;
1557         } else {
1558                 ring->queue = index + 1;
1559                 ring->int_enable = bcmgenet_tx_ring_int_enable;
1560                 ring->int_disable = bcmgenet_tx_ring_int_disable;
1561         }
1562         ring->cbs = priv->tx_cbs + write_ptr;
1563         ring->size = size;
1564         ring->c_index = 0;
1565         ring->free_bds = size;
1566         ring->write_ptr = write_ptr;
1567         ring->cb_ptr = write_ptr;
1568         ring->end_ptr = end_ptr - 1;
1569         ring->prod_index = 0;
1570
1571         /* Set flow period for ring != 16 */
1572         if (index != DESC_INDEX)
1573                 flow_period_val = ENET_MAX_MTU_SIZE << 16;
1574
1575         bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_PROD_INDEX);
1576         bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_CONS_INDEX);
1577         bcmgenet_tdma_ring_writel(priv, index, 1, DMA_MBUF_DONE_THRESH);
1578         /* Disable rate control for now */
1579         bcmgenet_tdma_ring_writel(priv, index, flow_period_val,
1580                         TDMA_FLOW_PERIOD);
1581         /* Unclassified traffic goes to ring 16 */
1582         bcmgenet_tdma_ring_writel(priv, index,
1583                         ((size << DMA_RING_SIZE_SHIFT) | RX_BUF_LENGTH),
1584                         DMA_RING_BUF_SIZE);
1585
1586         first_bd = write_ptr;
1587
1588         /* Set start and end address, read and write pointers */
1589         bcmgenet_tdma_ring_writel(priv, index, first_bd * words_per_bd,
1590                         DMA_START_ADDR);
1591         bcmgenet_tdma_ring_writel(priv, index, first_bd * words_per_bd,
1592                         TDMA_READ_PTR);
1593         bcmgenet_tdma_ring_writel(priv, index, first_bd,
1594                         TDMA_WRITE_PTR);
1595         bcmgenet_tdma_ring_writel(priv, index, end_ptr * words_per_bd - 1,
1596                         DMA_END_ADDR);
1597 }
1598
1599 /* Initialize a RDMA ring */
1600 static int bcmgenet_init_rx_ring(struct bcmgenet_priv *priv,
1601                                   unsigned int index, unsigned int size)
1602 {
1603         u32 words_per_bd = WORDS_PER_BD(priv);
1604         int ret;
1605
1606         priv->num_rx_bds = TOTAL_DESC;
1607         priv->rx_bds = priv->base + priv->hw_params->rdma_offset;
1608         priv->rx_bd_assign_ptr = priv->rx_bds;
1609         priv->rx_bd_assign_index = 0;
1610         priv->rx_c_index = 0;
1611         priv->rx_read_ptr = 0;
1612         priv->rx_cbs = kzalloc(priv->num_rx_bds * sizeof(struct enet_cb),
1613                                 GFP_KERNEL);
1614         if (!priv->rx_cbs)
1615                 return -ENOMEM;
1616
1617         ret = bcmgenet_alloc_rx_buffers(priv);
1618         if (ret) {
1619                 kfree(priv->rx_cbs);
1620                 return ret;
1621         }
1622
1623         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_WRITE_PTR);
1624         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_PROD_INDEX);
1625         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_CONS_INDEX);
1626         bcmgenet_rdma_ring_writel(priv, index,
1627                 ((size << DMA_RING_SIZE_SHIFT) | RX_BUF_LENGTH),
1628                 DMA_RING_BUF_SIZE);
1629         bcmgenet_rdma_ring_writel(priv, index, 0, DMA_START_ADDR);
1630         bcmgenet_rdma_ring_writel(priv, index,
1631                 words_per_bd * size - 1, DMA_END_ADDR);
1632         bcmgenet_rdma_ring_writel(priv, index,
1633                         (DMA_FC_THRESH_LO << DMA_XOFF_THRESHOLD_SHIFT) |
1634                         DMA_FC_THRESH_HI, RDMA_XON_XOFF_THRESH);
1635         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_READ_PTR);
1636
1637         return ret;
1638 }
1639
1640 /* init multi xmit queues, only available for GENET2+
1641  * the queue is partitioned as follows:
1642  *
1643  * queue 0 - 3 is priority based, each one has 32 descriptors,
1644  * with queue 0 being the highest priority queue.
1645  *
1646  * queue 16 is the default tx queue with GENET_DEFAULT_BD_CNT
1647  * descriptors: 256 - (number of tx queues * bds per queues) = 128
1648  * descriptors.
1649  *
1650  * The transmit control block pool is then partitioned as following:
1651  * - tx_cbs[0...127] are for queue 16
1652  * - tx_ring_cbs[0] points to tx_cbs[128..159]
1653  * - tx_ring_cbs[1] points to tx_cbs[160..191]
1654  * - tx_ring_cbs[2] points to tx_cbs[192..223]
1655  * - tx_ring_cbs[3] points to tx_cbs[224..255]
1656  */
1657 static void bcmgenet_init_multiq(struct net_device *dev)
1658 {
1659         struct bcmgenet_priv *priv = netdev_priv(dev);
1660         unsigned int i, dma_enable;
1661         u32 reg, dma_ctrl, ring_cfg = 0, dma_priority = 0;
1662
1663         if (!netif_is_multiqueue(dev)) {
1664                 netdev_warn(dev, "called with non multi queue aware HW\n");
1665                 return;
1666         }
1667
1668         dma_ctrl = bcmgenet_tdma_readl(priv, DMA_CTRL);
1669         dma_enable = dma_ctrl & DMA_EN;
1670         dma_ctrl &= ~DMA_EN;
1671         bcmgenet_tdma_writel(priv, dma_ctrl, DMA_CTRL);
1672
1673         /* Enable strict priority arbiter mode */
1674         bcmgenet_tdma_writel(priv, DMA_ARBITER_SP, DMA_ARB_CTRL);
1675
1676         for (i = 0; i < priv->hw_params->tx_queues; i++) {
1677                 /* first 64 tx_cbs are reserved for default tx queue
1678                  * (ring 16)
1679                  */
1680                 bcmgenet_init_tx_ring(priv, i, priv->hw_params->bds_cnt,
1681                                         i * priv->hw_params->bds_cnt,
1682                                         (i + 1) * priv->hw_params->bds_cnt);
1683
1684                 /* Configure ring as decriptor ring and setup priority */
1685                 ring_cfg |= 1 << i;
1686                 dma_priority |= ((GENET_Q0_PRIORITY + i) <<
1687                                 (GENET_MAX_MQ_CNT + 1) * i);
1688                 dma_ctrl |= 1 << (i + DMA_RING_BUF_EN_SHIFT);
1689         }
1690
1691         /* Enable rings */
1692         reg = bcmgenet_tdma_readl(priv, DMA_RING_CFG);
1693         reg |= ring_cfg;
1694         bcmgenet_tdma_writel(priv, reg, DMA_RING_CFG);
1695
1696         /* Use configured rings priority and set ring #16 priority */
1697         reg = bcmgenet_tdma_readl(priv, DMA_RING_PRIORITY);
1698         reg |= ((GENET_Q0_PRIORITY + priv->hw_params->tx_queues) << 20);
1699         reg |= dma_priority;
1700         bcmgenet_tdma_writel(priv, reg, DMA_PRIORITY);
1701
1702         /* Configure ring as descriptor ring and re-enable DMA if enabled */
1703         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
1704         reg |= dma_ctrl;
1705         if (dma_enable)
1706                 reg |= DMA_EN;
1707         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
1708 }
1709
1710 static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
1711 {
1712         int i;
1713
1714         /* disable DMA */
1715         bcmgenet_rdma_writel(priv, 0, DMA_CTRL);
1716         bcmgenet_tdma_writel(priv, 0, DMA_CTRL);
1717
1718         for (i = 0; i < priv->num_tx_bds; i++) {
1719                 if (priv->tx_cbs[i].skb != NULL) {
1720                         dev_kfree_skb(priv->tx_cbs[i].skb);
1721                         priv->tx_cbs[i].skb = NULL;
1722                 }
1723         }
1724
1725         bcmgenet_free_rx_buffers(priv);
1726         kfree(priv->rx_cbs);
1727         kfree(priv->tx_cbs);
1728 }
1729
1730 /* init_edma: Initialize DMA control register */
1731 static int bcmgenet_init_dma(struct bcmgenet_priv *priv)
1732 {
1733         int ret;
1734
1735         netif_dbg(priv, hw, priv->dev, "bcmgenet: init_edma\n");
1736
1737         /* by default, enable ring 16 (descriptor based) */
1738         ret = bcmgenet_init_rx_ring(priv, DESC_INDEX, TOTAL_DESC);
1739         if (ret) {
1740                 netdev_err(priv->dev, "failed to initialize RX ring\n");
1741                 return ret;
1742         }
1743
1744         /* init rDma */
1745         bcmgenet_rdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);
1746
1747         /* Init tDma */
1748         bcmgenet_tdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);
1749
1750         /* Initialize commont TX ring structures */
1751         priv->tx_bds = priv->base + priv->hw_params->tdma_offset;
1752         priv->num_tx_bds = TOTAL_DESC;
1753         priv->tx_cbs = kzalloc(priv->num_tx_bds * sizeof(struct enet_cb),
1754                                 GFP_KERNEL);
1755         if (!priv->tx_cbs) {
1756                 bcmgenet_fini_dma(priv);
1757                 return -ENOMEM;
1758         }
1759
1760         /* initialize multi xmit queue */
1761         bcmgenet_init_multiq(priv->dev);
1762
1763         /* initialize special ring 16 */
1764         bcmgenet_init_tx_ring(priv, DESC_INDEX, GENET_DEFAULT_BD_CNT,
1765                         priv->hw_params->tx_queues * priv->hw_params->bds_cnt,
1766                         TOTAL_DESC);
1767
1768         return 0;
1769 }
1770
1771 /* NAPI polling method*/
1772 static int bcmgenet_poll(struct napi_struct *napi, int budget)
1773 {
1774         struct bcmgenet_priv *priv = container_of(napi,
1775                         struct bcmgenet_priv, napi);
1776         unsigned int work_done;
1777
1778         /* tx reclaim */
1779         bcmgenet_tx_reclaim(priv->dev, &priv->tx_rings[DESC_INDEX]);
1780
1781         work_done = bcmgenet_desc_rx(priv, budget);
1782
1783         /* Advancing our consumer index*/
1784         priv->rx_c_index += work_done;
1785         priv->rx_c_index &= DMA_C_INDEX_MASK;
1786         bcmgenet_rdma_ring_writel(priv, DESC_INDEX,
1787                                 priv->rx_c_index, RDMA_CONS_INDEX);
1788         if (work_done < budget) {
1789                 napi_complete(napi);
1790                 bcmgenet_intrl2_0_writel(priv,
1791                         UMAC_IRQ_RXDMA_BDONE, INTRL2_CPU_MASK_CLEAR);
1792         }
1793
1794         return work_done;
1795 }
1796
1797 /* Interrupt bottom half */
1798 static void bcmgenet_irq_task(struct work_struct *work)
1799 {
1800         struct bcmgenet_priv *priv = container_of(
1801                         work, struct bcmgenet_priv, bcmgenet_irq_work);
1802
1803         netif_dbg(priv, intr, priv->dev, "%s\n", __func__);
1804
1805         /* Link UP/DOWN event */
1806         if ((priv->hw_params->flags & GENET_HAS_MDIO_INTR) &&
1807                 (priv->irq0_stat & (UMAC_IRQ_LINK_UP|UMAC_IRQ_LINK_DOWN))) {
1808                 phy_mac_interrupt(priv->phydev,
1809                         priv->irq0_stat & UMAC_IRQ_LINK_UP);
1810                 priv->irq0_stat &= ~(UMAC_IRQ_LINK_UP|UMAC_IRQ_LINK_DOWN);
1811         }
1812 }
1813
1814 /* bcmgenet_isr1: interrupt handler for ring buffer. */
1815 static irqreturn_t bcmgenet_isr1(int irq, void *dev_id)
1816 {
1817         struct bcmgenet_priv *priv = dev_id;
1818         unsigned int index;
1819
1820         /* Save irq status for bottom-half processing. */
1821         priv->irq1_stat =
1822                 bcmgenet_intrl2_1_readl(priv, INTRL2_CPU_STAT) &
1823                 ~priv->int1_mask;
1824         /* clear inerrupts*/
1825         bcmgenet_intrl2_1_writel(priv, priv->irq1_stat, INTRL2_CPU_CLEAR);
1826
1827         netif_dbg(priv, intr, priv->dev,
1828                 "%s: IRQ=0x%x\n", __func__, priv->irq1_stat);
1829         /* Check the MBDONE interrupts.
1830          * packet is done, reclaim descriptors
1831          */
1832         if (priv->irq1_stat & 0x0000ffff) {
1833                 index = 0;
1834                 for (index = 0; index < 16; index++) {
1835                         if (priv->irq1_stat & (1 << index))
1836                                 bcmgenet_tx_reclaim(priv->dev,
1837                                                 &priv->tx_rings[index]);
1838                 }
1839         }
1840         return IRQ_HANDLED;
1841 }
1842
1843 /* bcmgenet_isr0: Handle various interrupts. */
1844 static irqreturn_t bcmgenet_isr0(int irq, void *dev_id)
1845 {
1846         struct bcmgenet_priv *priv = dev_id;
1847
1848         /* Save irq status for bottom-half processing. */
1849         priv->irq0_stat =
1850                 bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_STAT) &
1851                 ~bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
1852         /* clear inerrupts*/
1853         bcmgenet_intrl2_0_writel(priv, priv->irq0_stat, INTRL2_CPU_CLEAR);
1854
1855         netif_dbg(priv, intr, priv->dev,
1856                 "IRQ=0x%x\n", priv->irq0_stat);
1857
1858         if (priv->irq0_stat & (UMAC_IRQ_RXDMA_BDONE | UMAC_IRQ_RXDMA_PDONE)) {
1859                 /* We use NAPI(software interrupt throttling, if
1860                  * Rx Descriptor throttling is not used.
1861                  * Disable interrupt, will be enabled in the poll method.
1862                  */
1863                 if (likely(napi_schedule_prep(&priv->napi))) {
1864                         bcmgenet_intrl2_0_writel(priv,
1865                                 UMAC_IRQ_RXDMA_BDONE, INTRL2_CPU_MASK_SET);
1866                         __napi_schedule(&priv->napi);
1867                 }
1868         }
1869         if (priv->irq0_stat &
1870                         (UMAC_IRQ_TXDMA_BDONE | UMAC_IRQ_TXDMA_PDONE)) {
1871                 /* Tx reclaim */
1872                 bcmgenet_tx_reclaim(priv->dev, &priv->tx_rings[DESC_INDEX]);
1873         }
1874         if (priv->irq0_stat & (UMAC_IRQ_PHY_DET_R |
1875                                 UMAC_IRQ_PHY_DET_F |
1876                                 UMAC_IRQ_LINK_UP |
1877                                 UMAC_IRQ_LINK_DOWN |
1878                                 UMAC_IRQ_HFB_SM |
1879                                 UMAC_IRQ_HFB_MM |
1880                                 UMAC_IRQ_MPD_R)) {
1881                 /* all other interested interrupts handled in bottom half */
1882                 schedule_work(&priv->bcmgenet_irq_work);
1883         }
1884
1885         if ((priv->hw_params->flags & GENET_HAS_MDIO_INTR) &&
1886                 priv->irq0_stat & (UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR)) {
1887                 priv->irq0_stat &= ~(UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR);
1888                 wake_up(&priv->wq);
1889         }
1890
1891         return IRQ_HANDLED;
1892 }
1893
1894 static void bcmgenet_umac_reset(struct bcmgenet_priv *priv)
1895 {
1896         u32 reg;
1897
1898         reg = bcmgenet_rbuf_ctrl_get(priv);
1899         reg |= BIT(1);
1900         bcmgenet_rbuf_ctrl_set(priv, reg);
1901         udelay(10);
1902
1903         reg &= ~BIT(1);
1904         bcmgenet_rbuf_ctrl_set(priv, reg);
1905         udelay(10);
1906 }
1907
1908 static void bcmgenet_set_hw_addr(struct bcmgenet_priv *priv,
1909                                   unsigned char *addr)
1910 {
1911         bcmgenet_umac_writel(priv, (addr[0] << 24) | (addr[1] << 16) |
1912                         (addr[2] << 8) | addr[3], UMAC_MAC0);
1913         bcmgenet_umac_writel(priv, (addr[4] << 8) | addr[5], UMAC_MAC1);
1914 }
1915
1916 static int bcmgenet_wol_resume(struct bcmgenet_priv *priv)
1917 {
1918         int ret;
1919
1920         /* From WOL-enabled suspend, switch to regular clock */
1921         clk_disable(priv->clk_wol);
1922         /* init umac registers to synchronize s/w with h/w */
1923         ret = init_umac(priv);
1924         if (ret)
1925                 return ret;
1926
1927         phy_init_hw(priv->phydev);
1928         /* Speed settings must be restored */
1929         bcmgenet_mii_config(priv->dev);
1930
1931         return 0;
1932 }
1933
1934 /* Returns a reusable dma control register value */
1935 static u32 bcmgenet_dma_disable(struct bcmgenet_priv *priv)
1936 {
1937         u32 reg;
1938         u32 dma_ctrl;
1939
1940         /* disable DMA */
1941         dma_ctrl = 1 << (DESC_INDEX + DMA_RING_BUF_EN_SHIFT) | DMA_EN;
1942         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
1943         reg &= ~dma_ctrl;
1944         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
1945
1946         reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
1947         reg &= ~dma_ctrl;
1948         bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
1949
1950         bcmgenet_umac_writel(priv, 1, UMAC_TX_FLUSH);
1951         udelay(10);
1952         bcmgenet_umac_writel(priv, 0, UMAC_TX_FLUSH);
1953
1954         return dma_ctrl;
1955 }
1956
1957 static void bcmgenet_enable_dma(struct bcmgenet_priv *priv, u32 dma_ctrl)
1958 {
1959         u32 reg;
1960
1961         reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
1962         reg |= dma_ctrl;
1963         bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
1964
1965         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
1966         reg |= dma_ctrl;
1967         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
1968 }
1969
1970 static int bcmgenet_open(struct net_device *dev)
1971 {
1972         struct bcmgenet_priv *priv = netdev_priv(dev);
1973         unsigned long dma_ctrl;
1974         u32 reg;
1975         int ret;
1976
1977         netif_dbg(priv, ifup, dev, "bcmgenet_open\n");
1978
1979         /* Turn on the clock */
1980         if (!IS_ERR(priv->clk))
1981                 clk_prepare_enable(priv->clk);
1982
1983         /* take MAC out of reset */
1984         bcmgenet_umac_reset(priv);
1985
1986         ret = init_umac(priv);
1987         if (ret)
1988                 goto err_clk_disable;
1989
1990         /* disable ethernet MAC while updating its registers */
1991         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
1992         reg &= ~(CMD_TX_EN | CMD_RX_EN);
1993         bcmgenet_umac_writel(priv, reg, UMAC_CMD);
1994
1995         bcmgenet_set_hw_addr(priv, dev->dev_addr);
1996
1997         if (priv->wol_enabled) {
1998                 ret = bcmgenet_wol_resume(priv);
1999                 if (ret)
2000                         return ret;
2001         }
2002
2003         if (phy_is_internal(priv->phydev)) {
2004                 reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
2005                 reg |= EXT_ENERGY_DET_MASK;
2006                 bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
2007         }
2008
2009         /* Disable RX/TX DMA and flush TX queues */
2010         dma_ctrl = bcmgenet_dma_disable(priv);
2011
2012         /* Reinitialize TDMA and RDMA and SW housekeeping */
2013         ret = bcmgenet_init_dma(priv);
2014         if (ret) {
2015                 netdev_err(dev, "failed to initialize DMA\n");
2016                 goto err_fini_dma;
2017         }
2018
2019         /* Always enable ring 16 - descriptor ring */
2020         bcmgenet_enable_dma(priv, dma_ctrl);
2021
2022         ret = request_irq(priv->irq0, bcmgenet_isr0, IRQF_SHARED,
2023                         dev->name, priv);
2024         if (ret < 0) {
2025                 netdev_err(dev, "can't request IRQ %d\n", priv->irq0);
2026                 goto err_fini_dma;
2027         }
2028
2029         ret = request_irq(priv->irq1, bcmgenet_isr1, IRQF_SHARED,
2030                                 dev->name, priv);
2031         if (ret < 0) {
2032                 netdev_err(dev, "can't request IRQ %d\n", priv->irq1);
2033                 goto err_irq0;
2034         }
2035
2036         /* Start the network engine */
2037         napi_enable(&priv->napi);
2038
2039         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
2040         reg |= (CMD_TX_EN | CMD_RX_EN);
2041         bcmgenet_umac_writel(priv, reg, UMAC_CMD);
2042
2043         /* Make sure we reflect the value of CRC_CMD_FWD */
2044         priv->crc_fwd_en = !!(reg & CMD_CRC_FWD);
2045
2046         device_set_wakeup_capable(&dev->dev, 1);
2047
2048         if (phy_is_internal(priv->phydev))
2049                 bcmgenet_power_up(priv, GENET_POWER_PASSIVE);
2050
2051         netif_tx_start_all_queues(dev);
2052
2053         phy_start(priv->phydev);
2054
2055         return 0;
2056
2057 err_irq0:
2058         free_irq(priv->irq0, dev);
2059 err_fini_dma:
2060         bcmgenet_fini_dma(priv);
2061 err_clk_disable:
2062         if (!IS_ERR(priv->clk))
2063                 clk_disable_unprepare(priv->clk);
2064         return ret;
2065 }
2066
2067 static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
2068 {
2069         int ret = 0;
2070         int timeout = 0;
2071         u32 reg;
2072
2073         /* Disable TDMA to stop add more frames in TX DMA */
2074         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
2075         reg &= ~DMA_EN;
2076         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
2077
2078         /* Check TDMA status register to confirm TDMA is disabled */
2079         while (timeout++ < DMA_TIMEOUT_VAL) {
2080                 reg = bcmgenet_tdma_readl(priv, DMA_STATUS);
2081                 if (reg & DMA_DISABLED)
2082                         break;
2083
2084                 udelay(1);
2085         }
2086
2087         if (timeout == DMA_TIMEOUT_VAL) {
2088                 netdev_warn(priv->dev,
2089                         "Timed out while disabling TX DMA\n");
2090                 ret = -ETIMEDOUT;
2091         }
2092
2093         /* Wait 10ms for packet drain in both tx and rx dma */
2094         usleep_range(10000, 20000);
2095
2096         /* Disable RDMA */
2097         reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
2098         reg &= ~DMA_EN;
2099         bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
2100
2101         timeout = 0;
2102         /* Check RDMA status register to confirm RDMA is disabled */
2103         while (timeout++ < DMA_TIMEOUT_VAL) {
2104                 reg = bcmgenet_rdma_readl(priv, DMA_STATUS);
2105                 if (reg & DMA_DISABLED)
2106                         break;
2107
2108                 udelay(1);
2109         }
2110
2111         if (timeout == DMA_TIMEOUT_VAL) {
2112                 netdev_warn(priv->dev,
2113                         "Timed out while disabling RX DMA\n");
2114                         ret = -ETIMEDOUT;
2115         }
2116
2117         return ret;
2118 }
2119
2120 static int bcmgenet_close(struct net_device *dev)
2121 {
2122         struct bcmgenet_priv *priv = netdev_priv(dev);
2123         int ret;
2124         u32 reg;
2125
2126         netif_dbg(priv, ifdown, dev, "bcmgenet_close\n");
2127
2128         phy_stop(priv->phydev);
2129
2130         /* Disable MAC receive */
2131         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
2132         reg &= ~CMD_RX_EN;
2133         bcmgenet_umac_writel(priv, reg, UMAC_CMD);
2134
2135         netif_tx_stop_all_queues(dev);
2136
2137         ret = bcmgenet_dma_teardown(priv);
2138         if (ret)
2139                 return ret;
2140
2141         /* Disable MAC transmit. TX DMA disabled have to done before this */
2142         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
2143         reg &= ~CMD_TX_EN;
2144         bcmgenet_umac_writel(priv, reg, UMAC_CMD);
2145
2146         napi_disable(&priv->napi);
2147
2148         /* tx reclaim */
2149         bcmgenet_tx_reclaim_all(dev);
2150         bcmgenet_fini_dma(priv);
2151
2152         free_irq(priv->irq0, priv);
2153         free_irq(priv->irq1, priv);
2154
2155         /* Wait for pending work items to complete - we are stopping
2156          * the clock now. Since interrupts are disabled, no new work
2157          * will be scheduled.
2158          */
2159         cancel_work_sync(&priv->bcmgenet_irq_work);
2160
2161         if (phy_is_internal(priv->phydev))
2162                 bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
2163
2164         if (priv->wol_enabled)
2165                 clk_enable(priv->clk_wol);
2166
2167         if (!IS_ERR(priv->clk))
2168                 clk_disable_unprepare(priv->clk);
2169
2170         return 0;
2171 }
2172
2173 static void bcmgenet_timeout(struct net_device *dev)
2174 {
2175         struct bcmgenet_priv *priv = netdev_priv(dev);
2176
2177         netif_dbg(priv, tx_err, dev, "bcmgenet_timeout\n");
2178
2179         dev->trans_start = jiffies;
2180
2181         dev->stats.tx_errors++;
2182
2183         netif_tx_wake_all_queues(dev);
2184 }
2185
2186 #define MAX_MC_COUNT    16
2187
2188 static inline void bcmgenet_set_mdf_addr(struct bcmgenet_priv *priv,
2189                                          unsigned char *addr,
2190                                          int *i,
2191                                          int *mc)
2192 {
2193         u32 reg;
2194
2195         bcmgenet_umac_writel(priv,
2196                         addr[0] << 8 | addr[1], UMAC_MDF_ADDR + (*i * 4));
2197         bcmgenet_umac_writel(priv,
2198                         addr[2] << 24 | addr[3] << 16 |
2199                         addr[4] << 8 | addr[5],
2200                         UMAC_MDF_ADDR + ((*i + 1) * 4));
2201         reg = bcmgenet_umac_readl(priv, UMAC_MDF_CTRL);
2202         reg |= (1 << (MAX_MC_COUNT - *mc));
2203         bcmgenet_umac_writel(priv, reg, UMAC_MDF_CTRL);
2204         *i += 2;
2205         (*mc)++;
2206 }
2207
2208 static void bcmgenet_set_rx_mode(struct net_device *dev)
2209 {
2210         struct bcmgenet_priv *priv = netdev_priv(dev);
2211         struct netdev_hw_addr *ha;
2212         int i, mc;
2213         u32 reg;
2214
2215         netif_dbg(priv, hw, dev, "%s: %08X\n", __func__, dev->flags);
2216
2217         /* Promiscous mode */
2218         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
2219         if (dev->flags & IFF_PROMISC) {
2220                 reg |= CMD_PROMISC;
2221                 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
2222                 bcmgenet_umac_writel(priv, 0, UMAC_MDF_CTRL);
2223                 return;
2224         } else {
2225                 reg &= ~CMD_PROMISC;
2226                 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
2227         }
2228
2229         /* UniMac doesn't support ALLMULTI */
2230         if (dev->flags & IFF_ALLMULTI) {
2231                 netdev_warn(dev, "ALLMULTI is not supported\n");
2232                 return;
2233         }
2234
2235         /* update MDF filter */
2236         i = 0;
2237         mc = 0;
2238         /* Broadcast */
2239         bcmgenet_set_mdf_addr(priv, dev->broadcast, &i, &mc);
2240         /* my own address.*/
2241         bcmgenet_set_mdf_addr(priv, dev->dev_addr, &i, &mc);
2242         /* Unicast list*/
2243         if (netdev_uc_count(dev) > (MAX_MC_COUNT - mc))
2244                 return;
2245
2246         if (!netdev_uc_empty(dev))
2247                 netdev_for_each_uc_addr(ha, dev)
2248                         bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
2249         /* Multicast */
2250         if (netdev_mc_empty(dev) || netdev_mc_count(dev) >= (MAX_MC_COUNT - mc))
2251                 return;
2252
2253         netdev_for_each_mc_addr(ha, dev)
2254                 bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
2255 }
2256
2257 /* Set the hardware MAC address. */
2258 static int bcmgenet_set_mac_addr(struct net_device *dev, void *p)
2259 {
2260         struct sockaddr *addr = p;
2261
2262         /* Setting the MAC address at the hardware level is not possible
2263          * without disabling the UniMAC RX/TX enable bits.
2264          */
2265         if (netif_running(dev))
2266                 return -EBUSY;
2267
2268         ether_addr_copy(dev->dev_addr, addr->sa_data);
2269
2270         return 0;
2271 }
2272
2273 static const struct net_device_ops bcmgenet_netdev_ops = {
2274         .ndo_open               = bcmgenet_open,
2275         .ndo_stop               = bcmgenet_close,
2276         .ndo_start_xmit         = bcmgenet_xmit,
2277         .ndo_tx_timeout         = bcmgenet_timeout,
2278         .ndo_set_rx_mode        = bcmgenet_set_rx_mode,
2279         .ndo_set_mac_address    = bcmgenet_set_mac_addr,
2280         .ndo_do_ioctl           = bcmgenet_ioctl,
2281         .ndo_set_features       = bcmgenet_set_features,
2282 };
2283
2284 /* Array of GENET hardware parameters/characteristics */
2285 static struct bcmgenet_hw_params bcmgenet_hw_params[] = {
2286         [GENET_V1] = {
2287                 .tx_queues = 0,
2288                 .rx_queues = 0,
2289                 .bds_cnt = 0,
2290                 .bp_in_en_shift = 16,
2291                 .bp_in_mask = 0xffff,
2292                 .hfb_filter_cnt = 16,
2293                 .qtag_mask = 0x1F,
2294                 .hfb_offset = 0x1000,
2295                 .rdma_offset = 0x2000,
2296                 .tdma_offset = 0x3000,
2297                 .words_per_bd = 2,
2298         },
2299         [GENET_V2] = {
2300                 .tx_queues = 4,
2301                 .rx_queues = 4,
2302                 .bds_cnt = 32,
2303                 .bp_in_en_shift = 16,
2304                 .bp_in_mask = 0xffff,
2305                 .hfb_filter_cnt = 16,
2306                 .qtag_mask = 0x1F,
2307                 .tbuf_offset = 0x0600,
2308                 .hfb_offset = 0x1000,
2309                 .hfb_reg_offset = 0x2000,
2310                 .rdma_offset = 0x3000,
2311                 .tdma_offset = 0x4000,
2312                 .words_per_bd = 2,
2313                 .flags = GENET_HAS_EXT,
2314         },
2315         [GENET_V3] = {
2316                 .tx_queues = 4,
2317                 .rx_queues = 4,
2318                 .bds_cnt = 32,
2319                 .bp_in_en_shift = 17,
2320                 .bp_in_mask = 0x1ffff,
2321                 .hfb_filter_cnt = 48,
2322                 .qtag_mask = 0x3F,
2323                 .tbuf_offset = 0x0600,
2324                 .hfb_offset = 0x8000,
2325                 .hfb_reg_offset = 0xfc00,
2326                 .rdma_offset = 0x10000,
2327                 .tdma_offset = 0x11000,
2328                 .words_per_bd = 2,
2329                 .flags = GENET_HAS_EXT | GENET_HAS_MDIO_INTR,
2330         },
2331         [GENET_V4] = {
2332                 .tx_queues = 4,
2333                 .rx_queues = 4,
2334                 .bds_cnt = 32,
2335                 .bp_in_en_shift = 17,
2336                 .bp_in_mask = 0x1ffff,
2337                 .hfb_filter_cnt = 48,
2338                 .qtag_mask = 0x3F,
2339                 .tbuf_offset = 0x0600,
2340                 .hfb_offset = 0x8000,
2341                 .hfb_reg_offset = 0xfc00,
2342                 .rdma_offset = 0x2000,
2343                 .tdma_offset = 0x4000,
2344                 .words_per_bd = 3,
2345                 .flags = GENET_HAS_40BITS | GENET_HAS_EXT | GENET_HAS_MDIO_INTR,
2346         },
2347 };
2348
2349 /* Infer hardware parameters from the detected GENET version */
2350 static void bcmgenet_set_hw_params(struct bcmgenet_priv *priv)
2351 {
2352         struct bcmgenet_hw_params *params;
2353         u32 reg;
2354         u8 major;
2355
2356         if (GENET_IS_V4(priv)) {
2357                 bcmgenet_dma_regs = bcmgenet_dma_regs_v3plus;
2358                 genet_dma_ring_regs = genet_dma_ring_regs_v4;
2359                 priv->dma_rx_chk_bit = DMA_RX_CHK_V3PLUS;
2360                 priv->version = GENET_V4;
2361         } else if (GENET_IS_V3(priv)) {
2362                 bcmgenet_dma_regs = bcmgenet_dma_regs_v3plus;
2363                 genet_dma_ring_regs = genet_dma_ring_regs_v123;
2364                 priv->dma_rx_chk_bit = DMA_RX_CHK_V3PLUS;
2365                 priv->version = GENET_V3;
2366         } else if (GENET_IS_V2(priv)) {
2367                 bcmgenet_dma_regs = bcmgenet_dma_regs_v2;
2368                 genet_dma_ring_regs = genet_dma_ring_regs_v123;
2369                 priv->dma_rx_chk_bit = DMA_RX_CHK_V12;
2370                 priv->version = GENET_V2;
2371         } else if (GENET_IS_V1(priv)) {
2372                 bcmgenet_dma_regs = bcmgenet_dma_regs_v1;
2373                 genet_dma_ring_regs = genet_dma_ring_regs_v123;
2374                 priv->dma_rx_chk_bit = DMA_RX_CHK_V12;
2375                 priv->version = GENET_V1;
2376         }
2377
2378         /* enum genet_version starts at 1 */
2379         priv->hw_params = &bcmgenet_hw_params[priv->version];
2380         params = priv->hw_params;
2381
2382         /* Read GENET HW version */
2383         reg = bcmgenet_sys_readl(priv, SYS_REV_CTRL);
2384         major = (reg >> 24 & 0x0f);
2385         if (major == 5)
2386                 major = 4;
2387         else if (major == 0)
2388                 major = 1;
2389         if (major != priv->version) {
2390                 dev_err(&priv->pdev->dev,
2391                         "GENET version mismatch, got: %d, configured for: %d\n",
2392                         major, priv->version);
2393         }
2394
2395         /* Print the GENET core version */
2396         dev_info(&priv->pdev->dev, "GENET " GENET_VER_FMT,
2397                 major, (reg >> 16) & 0x0f, reg & 0xffff);
2398
2399 #ifdef CONFIG_PHYS_ADDR_T_64BIT
2400         if (!(params->flags & GENET_HAS_40BITS))
2401                 pr_warn("GENET does not support 40-bits PA\n");
2402 #endif
2403
2404         pr_debug("Configuration for version: %d\n"
2405                 "TXq: %1d, RXq: %1d, BDs: %1d\n"
2406                 "BP << en: %2d, BP msk: 0x%05x\n"
2407                 "HFB count: %2d, QTAQ msk: 0x%05x\n"
2408                 "TBUF: 0x%04x, HFB: 0x%04x, HFBreg: 0x%04x\n"
2409                 "RDMA: 0x%05x, TDMA: 0x%05x\n"
2410                 "Words/BD: %d\n",
2411                 priv->version,
2412                 params->tx_queues, params->rx_queues, params->bds_cnt,
2413                 params->bp_in_en_shift, params->bp_in_mask,
2414                 params->hfb_filter_cnt, params->qtag_mask,
2415                 params->tbuf_offset, params->hfb_offset,
2416                 params->hfb_reg_offset,
2417                 params->rdma_offset, params->tdma_offset,
2418                 params->words_per_bd);
2419 }
2420
2421 static const struct of_device_id bcmgenet_match[] = {
2422         { .compatible = "brcm,genet-v1", .data = (void *)GENET_V1 },
2423         { .compatible = "brcm,genet-v2", .data = (void *)GENET_V2 },
2424         { .compatible = "brcm,genet-v3", .data = (void *)GENET_V3 },
2425         { .compatible = "brcm,genet-v4", .data = (void *)GENET_V4 },
2426         { },
2427 };
2428
2429 static int bcmgenet_probe(struct platform_device *pdev)
2430 {
2431         struct device_node *dn = pdev->dev.of_node;
2432         const struct of_device_id *of_id;
2433         struct bcmgenet_priv *priv;
2434         struct net_device *dev;
2435         const void *macaddr;
2436         struct resource *r;
2437         int err = -EIO;
2438
2439         /* Up to GENET_MAX_MQ_CNT + 1 TX queues and a single RX queue */
2440         dev = alloc_etherdev_mqs(sizeof(*priv), GENET_MAX_MQ_CNT + 1, 1);
2441         if (!dev) {
2442                 dev_err(&pdev->dev, "can't allocate net device\n");
2443                 return -ENOMEM;
2444         }
2445
2446         of_id = of_match_node(bcmgenet_match, dn);
2447         if (!of_id)
2448                 return -EINVAL;
2449
2450         priv = netdev_priv(dev);
2451         priv->irq0 = platform_get_irq(pdev, 0);
2452         priv->irq1 = platform_get_irq(pdev, 1);
2453         if (!priv->irq0 || !priv->irq1) {
2454                 dev_err(&pdev->dev, "can't find IRQs\n");
2455                 err = -EINVAL;
2456                 goto err;
2457         }
2458
2459         macaddr = of_get_mac_address(dn);
2460         if (!macaddr) {
2461                 dev_err(&pdev->dev, "can't find MAC address\n");
2462                 err = -EINVAL;
2463                 goto err;
2464         }
2465
2466         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2467         priv->base = devm_ioremap_resource(&pdev->dev, r);
2468         if (IS_ERR(priv->base)) {
2469                 err = PTR_ERR(priv->base);
2470                 goto err;
2471         }
2472
2473         SET_NETDEV_DEV(dev, &pdev->dev);
2474         dev_set_drvdata(&pdev->dev, dev);
2475         ether_addr_copy(dev->dev_addr, macaddr);
2476         dev->watchdog_timeo = 2 * HZ;
2477         dev->ethtool_ops = &bcmgenet_ethtool_ops;
2478         dev->netdev_ops = &bcmgenet_netdev_ops;
2479         netif_napi_add(dev, &priv->napi, bcmgenet_poll, 64);
2480
2481         priv->msg_enable = netif_msg_init(-1, GENET_MSG_DEFAULT);
2482
2483         /* Set hardware features */
2484         dev->hw_features |= NETIF_F_SG | NETIF_F_IP_CSUM |
2485                 NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM;
2486
2487         /* Set the needed headroom to account for any possible
2488          * features enabling/disabling at runtime
2489          */
2490         dev->needed_headroom += 64;
2491
2492         netdev_boot_setup_check(dev);
2493
2494         priv->dev = dev;
2495         priv->pdev = pdev;
2496         priv->version = (enum bcmgenet_version)of_id->data;
2497
2498         bcmgenet_set_hw_params(priv);
2499
2500         /* Mii wait queue */
2501         init_waitqueue_head(&priv->wq);
2502         /* Always use RX_BUF_LENGTH (2KB) buffer for all chips */
2503         priv->rx_buf_len = RX_BUF_LENGTH;
2504         INIT_WORK(&priv->bcmgenet_irq_work, bcmgenet_irq_task);
2505
2506         priv->clk = devm_clk_get(&priv->pdev->dev, "enet");
2507         if (IS_ERR(priv->clk))
2508                 dev_warn(&priv->pdev->dev, "failed to get enet clock\n");
2509
2510         priv->clk_wol = devm_clk_get(&priv->pdev->dev, "enet-wol");
2511         if (IS_ERR(priv->clk_wol))
2512                 dev_warn(&priv->pdev->dev, "failed to get enet-wol clock\n");
2513
2514         if (!IS_ERR(priv->clk))
2515                 clk_prepare_enable(priv->clk);
2516
2517         err = reset_umac(priv);
2518         if (err)
2519                 goto err_clk_disable;
2520
2521         err = bcmgenet_mii_init(dev);
2522         if (err)
2523                 goto err_clk_disable;
2524
2525         /* setup number of real queues  + 1 (GENET_V1 has 0 hardware queues
2526          * just the ring 16 descriptor based TX
2527          */
2528         netif_set_real_num_tx_queues(priv->dev, priv->hw_params->tx_queues + 1);
2529         netif_set_real_num_rx_queues(priv->dev, priv->hw_params->rx_queues + 1);
2530
2531         /* libphy will determine the link state */
2532         netif_carrier_off(dev);
2533
2534         /* Turn off the main clock, WOL clock is handled separately */
2535         if (!IS_ERR(priv->clk))
2536                 clk_disable_unprepare(priv->clk);
2537
2538         err = register_netdev(dev);
2539         if (err)
2540                 goto err;
2541
2542         return err;
2543
2544 err_clk_disable:
2545         if (!IS_ERR(priv->clk))
2546                 clk_disable_unprepare(priv->clk);
2547 err:
2548         free_netdev(dev);
2549         return err;
2550 }
2551
2552 static int bcmgenet_remove(struct platform_device *pdev)
2553 {
2554         struct bcmgenet_priv *priv = dev_to_priv(&pdev->dev);
2555
2556         dev_set_drvdata(&pdev->dev, NULL);
2557         unregister_netdev(priv->dev);
2558         bcmgenet_mii_exit(priv->dev);
2559         free_netdev(priv->dev);
2560
2561         return 0;
2562 }
2563
2564
2565 static struct platform_driver bcmgenet_driver = {
2566         .probe  = bcmgenet_probe,
2567         .remove = bcmgenet_remove,
2568         .driver = {
2569                 .name   = "bcmgenet",
2570                 .owner  = THIS_MODULE,
2571                 .of_match_table = bcmgenet_match,
2572         },
2573 };
2574 module_platform_driver(bcmgenet_driver);
2575
2576 MODULE_AUTHOR("Broadcom Corporation");
2577 MODULE_DESCRIPTION("Broadcom GENET Ethernet controller driver");
2578 MODULE_ALIAS("platform:bcmgenet");
2579 MODULE_LICENSE("GPL");