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
  11 #define pr_fmt(fmt)                             "bcmgenet: " fmt
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/sched.h>
  16 #include <linux/types.h>
  17 #include <linux/fcntl.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/string.h>
  20 #include <linux/if_ether.h>
  21 #include <linux/init.h>
  22 #include <linux/errno.h>
  23 #include <linux/delay.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/pm.h>
  27 #include <linux/clk.h>
  28 #include <linux/of.h>
  29 #include <linux/of_address.h>
  30 #include <linux/of_irq.h>
  31 #include <linux/of_net.h>
  32 #include <linux/of_platform.h>
  33 #include <net/arp.h>
  34
  35 #include <linux/mii.h>
  36 #include <linux/ethtool.h>
  37 #include <linux/netdevice.h>
  38 #include <linux/inetdevice.h>
  39 #include <linux/etherdevice.h>
  40 #include <linux/skbuff.h>
  41 #include <linux/in.h>
  42 #include <linux/ip.h>
  43 #include <linux/ipv6.h>
  44 #include <linux/phy.h>
  45 #include <linux/platform_data/bcmgenet.h>
  46
  47 #include <asm/unaligned.h>
  48
  49 #include "bcmgenet.h"
  50
  51 /* Maximum number of hardware queues, downsized if needed */
  52 #define GENET_MAX_MQ_CNT        4
  53
  54 /* Default highest priority queue for multi queue support */
  55 #define GENET_Q0_PRIORITY       0
  56
  57 #define GENET_Q16_RX_BD_CNT     \
  58         (TOTAL_DESC - priv->hw_params->rx_queues * priv->hw_params->rx_bds_per_q)
  59 #define GENET_Q16_TX_BD_CNT     \
  60         (TOTAL_DESC - priv->hw_params->tx_queues * priv->hw_params->tx_bds_per_q)
  61
  62 #define RX_BUF_LENGTH           2048
  63 #define SKB_ALIGNMENT           32
  64
  65 /* Tx/Rx DMA register offset, skip 256 descriptors */
  66 #define WORDS_PER_BD(p)         (p->hw_params->words_per_bd)
  67 #define DMA_DESC_SIZE           (WORDS_PER_BD(priv) * sizeof(u32))
  68
  69 #define GENET_TDMA_REG_OFF      (priv->hw_params->tdma_offset + \
  70                                 TOTAL_DESC * DMA_DESC_SIZE)
  71
  72 #define GENET_RDMA_REG_OFF      (priv->hw_params->rdma_offset + \
  73                                 TOTAL_DESC * DMA_DESC_SIZE)
  74
  75 static inline void dmadesc_set_length_status(struct bcmgenet_priv *priv,
  76                                              void __iomem *d, u32 value)
  77 {
  78         __raw_writel(value, d + DMA_DESC_LENGTH_STATUS);
  79 }
  80
  81 static inline u32 dmadesc_get_length_status(struct bcmgenet_priv *priv,
  82                                             void __iomem *d)
  83 {
  84         return __raw_readl(d + DMA_DESC_LENGTH_STATUS);
  85 }
  86
  87 static inline void dmadesc_set_addr(struct bcmgenet_priv *priv,
  88                                     void __iomem *d,
  89                                     dma_addr_t addr)
  90 {
  91         __raw_writel(lower_32_bits(addr), d + DMA_DESC_ADDRESS_LO);
  92
  93         /* Register writes to GISB bus can take couple hundred nanoseconds
  94          * and are done for each packet, save these expensive writes unless
  95          * the platform is explicitly configured for 64-bits/LPAE.
  96          */
  97 #ifdef CONFIG_PHYS_ADDR_T_64BIT
  98         if (priv->hw_params->flags & GENET_HAS_40BITS)
  99                 __raw_writel(upper_32_bits(addr), d + DMA_DESC_ADDRESS_HI);
 100 #endif
 101 }
 102
 103 /* Combined address + length/status setter */
 104 static inline void dmadesc_set(struct bcmgenet_priv *priv,
 105                                void __iomem *d, dma_addr_t addr, u32 val)
 106 {
 107         dmadesc_set_length_status(priv, d, val);
 108         dmadesc_set_addr(priv, d, addr);
 109 }
 110
 111 static inline dma_addr_t dmadesc_get_addr(struct bcmgenet_priv *priv,
 112                                           void __iomem *d)
 113 {
 114         dma_addr_t addr;
 115
 116         addr = __raw_readl(d + DMA_DESC_ADDRESS_LO);
 117
 118         /* Register writes to GISB bus can take couple hundred nanoseconds
 119          * and are done for each packet, save these expensive writes unless
 120          * the platform is explicitly configured for 64-bits/LPAE.
 121          */
 122 #ifdef CONFIG_PHYS_ADDR_T_64BIT
 123         if (priv->hw_params->flags & GENET_HAS_40BITS)
 124                 addr |= (u64)__raw_readl(d + DMA_DESC_ADDRESS_HI) << 32;
 125 #endif
 126         return addr;
 127 }
 128
 129 #define GENET_VER_FMT   "%1d.%1d EPHY: 0x%04x"
 130
 131 #define GENET_MSG_DEFAULT       (NETIF_MSG_DRV | NETIF_MSG_PROBE | \
 132                                 NETIF_MSG_LINK)
 133
 134 static inline u32 bcmgenet_rbuf_ctrl_get(struct bcmgenet_priv *priv)
 135 {
 136         if (GENET_IS_V1(priv))
 137                 return bcmgenet_rbuf_readl(priv, RBUF_FLUSH_CTRL_V1);
 138         else
 139                 return bcmgenet_sys_readl(priv, SYS_RBUF_FLUSH_CTRL);
 140 }
 141
 142 static inline void bcmgenet_rbuf_ctrl_set(struct bcmgenet_priv *priv, u32 val)
 143 {
 144         if (GENET_IS_V1(priv))
 145                 bcmgenet_rbuf_writel(priv, val, RBUF_FLUSH_CTRL_V1);
 146         else
 147                 bcmgenet_sys_writel(priv, val, SYS_RBUF_FLUSH_CTRL);
 148 }
 149
 150 /* These macros are defined to deal with register map change
 151  * between GENET1.1 and GENET2. Only those currently being used
 152  * by driver are defined.
 153  */
 154 static inline u32 bcmgenet_tbuf_ctrl_get(struct bcmgenet_priv *priv)
 155 {
 156         if (GENET_IS_V1(priv))
 157                 return bcmgenet_rbuf_readl(priv, TBUF_CTRL_V1);
 158         else
 159                 return __raw_readl(priv->base +
 160                                 priv->hw_params->tbuf_offset + TBUF_CTRL);
 161 }
 162
 163 static inline void bcmgenet_tbuf_ctrl_set(struct bcmgenet_priv *priv, u32 val)
 164 {
 165         if (GENET_IS_V1(priv))
 166                 bcmgenet_rbuf_writel(priv, val, TBUF_CTRL_V1);
 167         else
 168                 __raw_writel(val, priv->base +
 169                                 priv->hw_params->tbuf_offset + TBUF_CTRL);
 170 }
 171
 172 static inline u32 bcmgenet_bp_mc_get(struct bcmgenet_priv *priv)
 173 {
 174         if (GENET_IS_V1(priv))
 175                 return bcmgenet_rbuf_readl(priv, TBUF_BP_MC_V1);
 176         else
 177                 return __raw_readl(priv->base +
 178                                 priv->hw_params->tbuf_offset + TBUF_BP_MC);
 179 }
 180
 181 static inline void bcmgenet_bp_mc_set(struct bcmgenet_priv *priv, u32 val)
 182 {
 183         if (GENET_IS_V1(priv))
 184                 bcmgenet_rbuf_writel(priv, val, TBUF_BP_MC_V1);
 185         else
 186                 __raw_writel(val, priv->base +
 187                                 priv->hw_params->tbuf_offset + TBUF_BP_MC);
 188 }
 189
 190 /* RX/TX DMA register accessors */
 191 enum dma_reg {
 192         DMA_RING_CFG = 0,
 193         DMA_CTRL,
 194         DMA_STATUS,
 195         DMA_SCB_BURST_SIZE,
 196         DMA_ARB_CTRL,
 197         DMA_PRIORITY_0,
 198         DMA_PRIORITY_1,
 199         DMA_PRIORITY_2,
 200         DMA_INDEX2RING_0,
 201         DMA_INDEX2RING_1,
 202         DMA_INDEX2RING_2,
 203         DMA_INDEX2RING_3,
 204         DMA_INDEX2RING_4,
 205         DMA_INDEX2RING_5,
 206         DMA_INDEX2RING_6,
 207         DMA_INDEX2RING_7,
 208 };
 209
 210 static const u8 bcmgenet_dma_regs_v3plus[] = {
 211         [DMA_RING_CFG]          = 0x00,
 212         [DMA_CTRL]              = 0x04,
 213         [DMA_STATUS]            = 0x08,
 214         [DMA_SCB_BURST_SIZE]    = 0x0C,
 215         [DMA_ARB_CTRL]          = 0x2C,
 216         [DMA_PRIORITY_0]        = 0x30,
 217         [DMA_PRIORITY_1]        = 0x34,
 218         [DMA_PRIORITY_2]        = 0x38,
 219         [DMA_INDEX2RING_0]      = 0x70,
 220         [DMA_INDEX2RING_1]      = 0x74,
 221         [DMA_INDEX2RING_2]      = 0x78,
 222         [DMA_INDEX2RING_3]      = 0x7C,
 223         [DMA_INDEX2RING_4]      = 0x80,
 224         [DMA_INDEX2RING_5]      = 0x84,
 225         [DMA_INDEX2RING_6]      = 0x88,
 226         [DMA_INDEX2RING_7]      = 0x8C,
 227 };
 228
 229 static const u8 bcmgenet_dma_regs_v2[] = {
 230         [DMA_RING_CFG]          = 0x00,
 231         [DMA_CTRL]              = 0x04,
 232         [DMA_STATUS]            = 0x08,
 233         [DMA_SCB_BURST_SIZE]    = 0x0C,
 234         [DMA_ARB_CTRL]          = 0x30,
 235         [DMA_PRIORITY_0]        = 0x34,
 236         [DMA_PRIORITY_1]        = 0x38,
 237         [DMA_PRIORITY_2]        = 0x3C,
 238 };
 239
 240 static const u8 bcmgenet_dma_regs_v1[] = {
 241         [DMA_CTRL]              = 0x00,
 242         [DMA_STATUS]            = 0x04,
 243         [DMA_SCB_BURST_SIZE]    = 0x0C,
 244         [DMA_ARB_CTRL]          = 0x30,
 245         [DMA_PRIORITY_0]        = 0x34,
 246         [DMA_PRIORITY_1]        = 0x38,
 247         [DMA_PRIORITY_2]        = 0x3C,
 248 };
 249
 250 /* Set at runtime once bcmgenet version is known */
 251 static const u8 *bcmgenet_dma_regs;
 252
 253 static inline struct bcmgenet_priv *dev_to_priv(struct device *dev)
 254 {
 255         return netdev_priv(dev_get_drvdata(dev));
 256 }
 257
 258 static inline u32 bcmgenet_tdma_readl(struct bcmgenet_priv *priv,
 259                                       enum dma_reg r)
 260 {
 261         return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
 262                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
 263 }
 264
 265 static inline void bcmgenet_tdma_writel(struct bcmgenet_priv *priv,
 266                                         u32 val, enum dma_reg r)
 267 {
 268         __raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
 269                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
 270 }
 271
 272 static inline u32 bcmgenet_rdma_readl(struct bcmgenet_priv *priv,
 273                                       enum dma_reg r)
 274 {
 275         return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
 276                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
 277 }
 278
 279 static inline void bcmgenet_rdma_writel(struct bcmgenet_priv *priv,
 280                                         u32 val, enum dma_reg r)
 281 {
 282         __raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
 283                         DMA_RINGS_SIZE + bcmgenet_dma_regs[r]);
 284 }
 285
 286 /* RDMA/TDMA ring registers and accessors
 287  * we merge the common fields and just prefix with T/D the registers
 288  * having different meaning depending on the direction
 289  */
 290 enum dma_ring_reg {
 291         TDMA_READ_PTR = 0,
 292         RDMA_WRITE_PTR = TDMA_READ_PTR,
 293         TDMA_READ_PTR_HI,
 294         RDMA_WRITE_PTR_HI = TDMA_READ_PTR_HI,
 295         TDMA_CONS_INDEX,
 296         RDMA_PROD_INDEX = TDMA_CONS_INDEX,
 297         TDMA_PROD_INDEX,
 298         RDMA_CONS_INDEX = TDMA_PROD_INDEX,
 299         DMA_RING_BUF_SIZE,
 300         DMA_START_ADDR,
 301         DMA_START_ADDR_HI,
 302         DMA_END_ADDR,
 303         DMA_END_ADDR_HI,
 304         DMA_MBUF_DONE_THRESH,
 305         TDMA_FLOW_PERIOD,
 306         RDMA_XON_XOFF_THRESH = TDMA_FLOW_PERIOD,
 307         TDMA_WRITE_PTR,
 308         RDMA_READ_PTR = TDMA_WRITE_PTR,
 309         TDMA_WRITE_PTR_HI,
 310         RDMA_READ_PTR_HI = TDMA_WRITE_PTR_HI
 311 };
 312
 313 /* GENET v4 supports 40-bits pointer addressing
 314  * for obvious reasons the LO and HI word parts
 315  * are contiguous, but this offsets the other
 316  * registers.
 317  */
 318 static const u8 genet_dma_ring_regs_v4[] = {
 319         [TDMA_READ_PTR]                 = 0x00,
 320         [TDMA_READ_PTR_HI]              = 0x04,
 321         [TDMA_CONS_INDEX]               = 0x08,
 322         [TDMA_PROD_INDEX]               = 0x0C,
 323         [DMA_RING_BUF_SIZE]             = 0x10,
 324         [DMA_START_ADDR]                = 0x14,
 325         [DMA_START_ADDR_HI]             = 0x18,
 326         [DMA_END_ADDR]                  = 0x1C,
 327         [DMA_END_ADDR_HI]               = 0x20,
 328         [DMA_MBUF_DONE_THRESH]          = 0x24,
 329         [TDMA_FLOW_PERIOD]              = 0x28,
 330         [TDMA_WRITE_PTR]                = 0x2C,
 331         [TDMA_WRITE_PTR_HI]             = 0x30,
 332 };
 333
 334 static const u8 genet_dma_ring_regs_v123[] = {
 335         [TDMA_READ_PTR]                 = 0x00,
 336         [TDMA_CONS_INDEX]               = 0x04,
 337         [TDMA_PROD_INDEX]               = 0x08,
 338         [DMA_RING_BUF_SIZE]             = 0x0C,
 339         [DMA_START_ADDR]                = 0x10,
 340         [DMA_END_ADDR]                  = 0x14,
 341         [DMA_MBUF_DONE_THRESH]          = 0x18,
 342         [TDMA_FLOW_PERIOD]              = 0x1C,
 343         [TDMA_WRITE_PTR]                = 0x20,
 344 };
 345
 346 /* Set at runtime once GENET version is known */
 347 static const u8 *genet_dma_ring_regs;
 348
 349 static inline u32 bcmgenet_tdma_ring_readl(struct bcmgenet_priv *priv,
 350                                            unsigned int ring,
 351                                            enum dma_ring_reg r)
 352 {
 353         return __raw_readl(priv->base + GENET_TDMA_REG_OFF +
 354                         (DMA_RING_SIZE * ring) +
 355                         genet_dma_ring_regs[r]);
 356 }
 357
 358 static inline void bcmgenet_tdma_ring_writel(struct bcmgenet_priv *priv,
 359                                              unsigned int ring, u32 val,
 360                                              enum dma_ring_reg r)
 361 {
 362         __raw_writel(val, priv->base + GENET_TDMA_REG_OFF +
 363                         (DMA_RING_SIZE * ring) +
 364                         genet_dma_ring_regs[r]);
 365 }
 366
 367 static inline u32 bcmgenet_rdma_ring_readl(struct bcmgenet_priv *priv,
 368                                            unsigned int ring,
 369                                            enum dma_ring_reg r)
 370 {
 371         return __raw_readl(priv->base + GENET_RDMA_REG_OFF +
 372                         (DMA_RING_SIZE * ring) +
 373                         genet_dma_ring_regs[r]);
 374 }
 375
 376 static inline void bcmgenet_rdma_ring_writel(struct bcmgenet_priv *priv,
 377                                              unsigned int ring, u32 val,
 378                                              enum dma_ring_reg r)
 379 {
 380         __raw_writel(val, priv->base + GENET_RDMA_REG_OFF +
 381                         (DMA_RING_SIZE * ring) +
 382                         genet_dma_ring_regs[r]);
 383 }
 384
 385 static int bcmgenet_get_settings(struct net_device *dev,
 386                                  struct ethtool_cmd *cmd)
 387 {
 388         struct bcmgenet_priv *priv = netdev_priv(dev);
 389
 390         if (!netif_running(dev))
 391                 return -EINVAL;
 392
 393         if (!priv->phydev)
 394                 return -ENODEV;
 395
 396         return phy_ethtool_gset(priv->phydev, cmd);
 397 }
 398
 399 static int bcmgenet_set_settings(struct net_device *dev,
 400                                  struct ethtool_cmd *cmd)
 401 {
 402         struct bcmgenet_priv *priv = netdev_priv(dev);
 403
 404         if (!netif_running(dev))
 405                 return -EINVAL;
 406
 407         if (!priv->phydev)
 408                 return -ENODEV;
 409
 410         return phy_ethtool_sset(priv->phydev, cmd);
 411 }
 412
 413 static int bcmgenet_set_rx_csum(struct net_device *dev,
 414                                 netdev_features_t wanted)
 415 {
 416         struct bcmgenet_priv *priv = netdev_priv(dev);
 417         u32 rbuf_chk_ctrl;
 418         bool rx_csum_en;
 419
 420         rx_csum_en = !!(wanted & NETIF_F_RXCSUM);
 421
 422         rbuf_chk_ctrl = bcmgenet_rbuf_readl(priv, RBUF_CHK_CTRL);
 423
 424         /* enable rx checksumming */
 425         if (rx_csum_en)
 426                 rbuf_chk_ctrl |= RBUF_RXCHK_EN;
 427         else
 428                 rbuf_chk_ctrl &= ~RBUF_RXCHK_EN;
 429         priv->desc_rxchk_en = rx_csum_en;
 430
 431         /* If UniMAC forwards CRC, we need to skip over it to get
 432          * a valid CHK bit to be set in the per-packet status word
 433         */
 434         if (rx_csum_en && priv->crc_fwd_en)
 435                 rbuf_chk_ctrl |= RBUF_SKIP_FCS;
 436         else
 437                 rbuf_chk_ctrl &= ~RBUF_SKIP_FCS;
 438
 439         bcmgenet_rbuf_writel(priv, rbuf_chk_ctrl, RBUF_CHK_CTRL);
 440
 441         return 0;
 442 }
 443
 444 static int bcmgenet_set_tx_csum(struct net_device *dev,
 445                                 netdev_features_t wanted)
 446 {
 447         struct bcmgenet_priv *priv = netdev_priv(dev);
 448         bool desc_64b_en;
 449         u32 tbuf_ctrl, rbuf_ctrl;
 450
 451         tbuf_ctrl = bcmgenet_tbuf_ctrl_get(priv);
 452         rbuf_ctrl = bcmgenet_rbuf_readl(priv, RBUF_CTRL);
 453
 454         desc_64b_en = !!(wanted & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM));
 455
 456         /* enable 64 bytes descriptor in both directions (RBUF and TBUF) */
 457         if (desc_64b_en) {
 458                 tbuf_ctrl |= RBUF_64B_EN;
 459                 rbuf_ctrl |= RBUF_64B_EN;
 460         } else {
 461                 tbuf_ctrl &= ~RBUF_64B_EN;
 462                 rbuf_ctrl &= ~RBUF_64B_EN;
 463         }
 464         priv->desc_64b_en = desc_64b_en;
 465
 466         bcmgenet_tbuf_ctrl_set(priv, tbuf_ctrl);
 467         bcmgenet_rbuf_writel(priv, rbuf_ctrl, RBUF_CTRL);
 468
 469         return 0;
 470 }
 471
 472 static int bcmgenet_set_features(struct net_device *dev,
 473                                  netdev_features_t features)
 474 {
 475         netdev_features_t changed = features ^ dev->features;
 476         netdev_features_t wanted = dev->wanted_features;
 477         int ret = 0;
 478
 479         if (changed & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
 480                 ret = bcmgenet_set_tx_csum(dev, wanted);
 481         if (changed & (NETIF_F_RXCSUM))
 482                 ret = bcmgenet_set_rx_csum(dev, wanted);
 483
 484         return ret;
 485 }
 486
 487 static u32 bcmgenet_get_msglevel(struct net_device *dev)
 488 {
 489         struct bcmgenet_priv *priv = netdev_priv(dev);
 490
 491         return priv->msg_enable;
 492 }
 493
 494 static void bcmgenet_set_msglevel(struct net_device *dev, u32 level)
 495 {
 496         struct bcmgenet_priv *priv = netdev_priv(dev);
 497
 498         priv->msg_enable = level;
 499 }
 500
 501 /* standard ethtool support functions. */
 502 enum bcmgenet_stat_type {
 503         BCMGENET_STAT_NETDEV = -1,
 504         BCMGENET_STAT_MIB_RX,
 505         BCMGENET_STAT_MIB_TX,
 506         BCMGENET_STAT_RUNT,
 507         BCMGENET_STAT_MISC,
 508         BCMGENET_STAT_SOFT,
 509 };
 510
 511 struct bcmgenet_stats {
 512         char stat_string[ETH_GSTRING_LEN];
 513         int stat_sizeof;
 514         int stat_offset;
 515         enum bcmgenet_stat_type type;
 516         /* reg offset from UMAC base for misc counters */
 517         u16 reg_offset;
 518 };
 519
 520 #define STAT_NETDEV(m) { \
 521         .stat_string = __stringify(m), \
 522         .stat_sizeof = sizeof(((struct net_device_stats *)0)->m), \
 523         .stat_offset = offsetof(struct net_device_stats, m), \
 524         .type = BCMGENET_STAT_NETDEV, \
 525 }
 526
 527 #define STAT_GENET_MIB(str, m, _type) { \
 528         .stat_string = str, \
 529         .stat_sizeof = sizeof(((struct bcmgenet_priv *)0)->m), \
 530         .stat_offset = offsetof(struct bcmgenet_priv, m), \
 531         .type = _type, \
 532 }
 533
 534 #define STAT_GENET_MIB_RX(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_MIB_RX)
 535 #define STAT_GENET_MIB_TX(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_MIB_TX)
 536 #define STAT_GENET_RUNT(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_RUNT)
 537 #define STAT_GENET_SOFT_MIB(str, m) STAT_GENET_MIB(str, m, BCMGENET_STAT_SOFT)
 538
 539 #define STAT_GENET_MISC(str, m, offset) { \
 540         .stat_string = str, \
 541         .stat_sizeof = sizeof(((struct bcmgenet_priv *)0)->m), \
 542         .stat_offset = offsetof(struct bcmgenet_priv, m), \
 543         .type = BCMGENET_STAT_MISC, \
 544         .reg_offset = offset, \
 545 }
 546
 547
 548 /* There is a 0xC gap between the end of RX and beginning of TX stats and then
 549  * between the end of TX stats and the beginning of the RX RUNT
 550  */
 551 #define BCMGENET_STAT_OFFSET    0xc
 552
 553 /* Hardware counters must be kept in sync because the order/offset
 554  * is important here (order in structure declaration = order in hardware)
 555  */
 556 static const struct bcmgenet_stats bcmgenet_gstrings_stats[] = {
 557         /* general stats */
 558         STAT_NETDEV(rx_packets),
 559         STAT_NETDEV(tx_packets),
 560         STAT_NETDEV(rx_bytes),
 561         STAT_NETDEV(tx_bytes),
 562         STAT_NETDEV(rx_errors),
 563         STAT_NETDEV(tx_errors),
 564         STAT_NETDEV(rx_dropped),
 565         STAT_NETDEV(tx_dropped),
 566         STAT_NETDEV(multicast),
 567         /* UniMAC RSV counters */
 568         STAT_GENET_MIB_RX("rx_64_octets", mib.rx.pkt_cnt.cnt_64),
 569         STAT_GENET_MIB_RX("rx_65_127_oct", mib.rx.pkt_cnt.cnt_127),
 570         STAT_GENET_MIB_RX("rx_128_255_oct", mib.rx.pkt_cnt.cnt_255),
 571         STAT_GENET_MIB_RX("rx_256_511_oct", mib.rx.pkt_cnt.cnt_511),
 572         STAT_GENET_MIB_RX("rx_512_1023_oct", mib.rx.pkt_cnt.cnt_1023),
 573         STAT_GENET_MIB_RX("rx_1024_1518_oct", mib.rx.pkt_cnt.cnt_1518),
 574         STAT_GENET_MIB_RX("rx_vlan_1519_1522_oct", mib.rx.pkt_cnt.cnt_mgv),
 575         STAT_GENET_MIB_RX("rx_1522_2047_oct", mib.rx.pkt_cnt.cnt_2047),
 576         STAT_GENET_MIB_RX("rx_2048_4095_oct", mib.rx.pkt_cnt.cnt_4095),
 577         STAT_GENET_MIB_RX("rx_4096_9216_oct", mib.rx.pkt_cnt.cnt_9216),
 578         STAT_GENET_MIB_RX("rx_pkts", mib.rx.pkt),
 579         STAT_GENET_MIB_RX("rx_bytes", mib.rx.bytes),
 580         STAT_GENET_MIB_RX("rx_multicast", mib.rx.mca),
 581         STAT_GENET_MIB_RX("rx_broadcast", mib.rx.bca),
 582         STAT_GENET_MIB_RX("rx_fcs", mib.rx.fcs),
 583         STAT_GENET_MIB_RX("rx_control", mib.rx.cf),
 584         STAT_GENET_MIB_RX("rx_pause", mib.rx.pf),
 585         STAT_GENET_MIB_RX("rx_unknown", mib.rx.uo),
 586         STAT_GENET_MIB_RX("rx_align", mib.rx.aln),
 587         STAT_GENET_MIB_RX("rx_outrange", mib.rx.flr),
 588         STAT_GENET_MIB_RX("rx_code", mib.rx.cde),
 589         STAT_GENET_MIB_RX("rx_carrier", mib.rx.fcr),
 590         STAT_GENET_MIB_RX("rx_oversize", mib.rx.ovr),
 591         STAT_GENET_MIB_RX("rx_jabber", mib.rx.jbr),
 592         STAT_GENET_MIB_RX("rx_mtu_err", mib.rx.mtue),
 593         STAT_GENET_MIB_RX("rx_good_pkts", mib.rx.pok),
 594         STAT_GENET_MIB_RX("rx_unicast", mib.rx.uc),
 595         STAT_GENET_MIB_RX("rx_ppp", mib.rx.ppp),
 596         STAT_GENET_MIB_RX("rx_crc", mib.rx.rcrc),
 597         /* UniMAC TSV counters */
 598         STAT_GENET_MIB_TX("tx_64_octets", mib.tx.pkt_cnt.cnt_64),
 599         STAT_GENET_MIB_TX("tx_65_127_oct", mib.tx.pkt_cnt.cnt_127),
 600         STAT_GENET_MIB_TX("tx_128_255_oct", mib.tx.pkt_cnt.cnt_255),
 601         STAT_GENET_MIB_TX("tx_256_511_oct", mib.tx.pkt_cnt.cnt_511),
 602         STAT_GENET_MIB_TX("tx_512_1023_oct", mib.tx.pkt_cnt.cnt_1023),
 603         STAT_GENET_MIB_TX("tx_1024_1518_oct", mib.tx.pkt_cnt.cnt_1518),
 604         STAT_GENET_MIB_TX("tx_vlan_1519_1522_oct", mib.tx.pkt_cnt.cnt_mgv),
 605         STAT_GENET_MIB_TX("tx_1522_2047_oct", mib.tx.pkt_cnt.cnt_2047),
 606         STAT_GENET_MIB_TX("tx_2048_4095_oct", mib.tx.pkt_cnt.cnt_4095),
 607         STAT_GENET_MIB_TX("tx_4096_9216_oct", mib.tx.pkt_cnt.cnt_9216),
 608         STAT_GENET_MIB_TX("tx_pkts", mib.tx.pkts),
 609         STAT_GENET_MIB_TX("tx_multicast", mib.tx.mca),
 610         STAT_GENET_MIB_TX("tx_broadcast", mib.tx.bca),
 611         STAT_GENET_MIB_TX("tx_pause", mib.tx.pf),
 612         STAT_GENET_MIB_TX("tx_control", mib.tx.cf),
 613         STAT_GENET_MIB_TX("tx_fcs_err", mib.tx.fcs),
 614         STAT_GENET_MIB_TX("tx_oversize", mib.tx.ovr),
 615         STAT_GENET_MIB_TX("tx_defer", mib.tx.drf),
 616         STAT_GENET_MIB_TX("tx_excess_defer", mib.tx.edf),
 617         STAT_GENET_MIB_TX("tx_single_col", mib.tx.scl),
 618         STAT_GENET_MIB_TX("tx_multi_col", mib.tx.mcl),
 619         STAT_GENET_MIB_TX("tx_late_col", mib.tx.lcl),
 620         STAT_GENET_MIB_TX("tx_excess_col", mib.tx.ecl),
 621         STAT_GENET_MIB_TX("tx_frags", mib.tx.frg),
 622         STAT_GENET_MIB_TX("tx_total_col", mib.tx.ncl),
 623         STAT_GENET_MIB_TX("tx_jabber", mib.tx.jbr),
 624         STAT_GENET_MIB_TX("tx_bytes", mib.tx.bytes),
 625         STAT_GENET_MIB_TX("tx_good_pkts", mib.tx.pok),
 626         STAT_GENET_MIB_TX("tx_unicast", mib.tx.uc),
 627         /* UniMAC RUNT counters */
 628         STAT_GENET_RUNT("rx_runt_pkts", mib.rx_runt_cnt),
 629         STAT_GENET_RUNT("rx_runt_valid_fcs", mib.rx_runt_fcs),
 630         STAT_GENET_RUNT("rx_runt_inval_fcs_align", mib.rx_runt_fcs_align),
 631         STAT_GENET_RUNT("rx_runt_bytes", mib.rx_runt_bytes),
 632         /* Misc UniMAC counters */
 633         STAT_GENET_MISC("rbuf_ovflow_cnt", mib.rbuf_ovflow_cnt,
 634                         UMAC_RBUF_OVFL_CNT),
 635         STAT_GENET_MISC("rbuf_err_cnt", mib.rbuf_err_cnt, UMAC_RBUF_ERR_CNT),
 636         STAT_GENET_MISC("mdf_err_cnt", mib.mdf_err_cnt, UMAC_MDF_ERR_CNT),
 637         STAT_GENET_SOFT_MIB("alloc_rx_buff_failed", mib.alloc_rx_buff_failed),
 638         STAT_GENET_SOFT_MIB("rx_dma_failed", mib.rx_dma_failed),
 639         STAT_GENET_SOFT_MIB("tx_dma_failed", mib.tx_dma_failed),
 640 };
 641
 642 #define BCMGENET_STATS_LEN      ARRAY_SIZE(bcmgenet_gstrings_stats)
 643
 644 static void bcmgenet_get_drvinfo(struct net_device *dev,
 645                                  struct ethtool_drvinfo *info)
 646 {
 647         strlcpy(info->driver, "bcmgenet", sizeof(info->driver));
 648         strlcpy(info->version, "v2.0", sizeof(info->version));
 649         info->n_stats = BCMGENET_STATS_LEN;
 650 }
 651
 652 static int bcmgenet_get_sset_count(struct net_device *dev, int string_set)
 653 {
 654         switch (string_set) {
 655         case ETH_SS_STATS:
 656                 return BCMGENET_STATS_LEN;
 657         default:
 658                 return -EOPNOTSUPP;
 659         }
 660 }
 661
 662 static void bcmgenet_get_strings(struct net_device *dev, u32 stringset,
 663                                  u8 *data)
 664 {
 665         int i;
 666
 667         switch (stringset) {
 668         case ETH_SS_STATS:
 669                 for (i = 0; i < BCMGENET_STATS_LEN; i++) {
 670                         memcpy(data + i * ETH_GSTRING_LEN,
 671                                bcmgenet_gstrings_stats[i].stat_string,
 672                                ETH_GSTRING_LEN);
 673                 }
 674                 break;
 675         }
 676 }
 677
 678 static void bcmgenet_update_mib_counters(struct bcmgenet_priv *priv)
 679 {
 680         int i, j = 0;
 681
 682         for (i = 0; i < BCMGENET_STATS_LEN; i++) {
 683                 const struct bcmgenet_stats *s;
 684                 u8 offset = 0;
 685                 u32 val = 0;
 686                 char *p;
 687
 688                 s = &bcmgenet_gstrings_stats[i];
 689                 switch (s->type) {
 690                 case BCMGENET_STAT_NETDEV:
 691                 case BCMGENET_STAT_SOFT:
 692                         continue;
 693                 case BCMGENET_STAT_MIB_RX:
 694                 case BCMGENET_STAT_MIB_TX:
 695                 case BCMGENET_STAT_RUNT:
 696                         if (s->type != BCMGENET_STAT_MIB_RX)
 697                                 offset = BCMGENET_STAT_OFFSET;
 698                         val = bcmgenet_umac_readl(priv,
 699                                                   UMAC_MIB_START + j + offset);
 700                         break;
 701                 case BCMGENET_STAT_MISC:
 702                         val = bcmgenet_umac_readl(priv, s->reg_offset);
 703                         /* clear if overflowed */
 704                         if (val == ~0)
 705                                 bcmgenet_umac_writel(priv, 0, s->reg_offset);
 706                         break;
 707                 }
 708
 709                 j += s->stat_sizeof;
 710                 p = (char *)priv + s->stat_offset;
 711                 *(u32 *)p = val;
 712         }
 713 }
 714
 715 static void bcmgenet_get_ethtool_stats(struct net_device *dev,
 716                                        struct ethtool_stats *stats,
 717                                        u64 *data)
 718 {
 719         struct bcmgenet_priv *priv = netdev_priv(dev);
 720         int i;
 721
 722         if (netif_running(dev))
 723                 bcmgenet_update_mib_counters(priv);
 724
 725         for (i = 0; i < BCMGENET_STATS_LEN; i++) {
 726                 const struct bcmgenet_stats *s;
 727                 char *p;
 728
 729                 s = &bcmgenet_gstrings_stats[i];
 730                 if (s->type == BCMGENET_STAT_NETDEV)
 731                         p = (char *)&dev->stats;
 732                 else
 733                         p = (char *)priv;
 734                 p += s->stat_offset;
 735                 data[i] = *(u32 *)p;
 736         }
 737 }
 738
 739 static void bcmgenet_eee_enable_set(struct net_device *dev, bool enable)
 740 {
 741         struct bcmgenet_priv *priv = netdev_priv(dev);
 742         u32 off = priv->hw_params->tbuf_offset + TBUF_ENERGY_CTRL;
 743         u32 reg;
 744
 745         if (enable && !priv->clk_eee_enabled) {
 746                 clk_prepare_enable(priv->clk_eee);
 747                 priv->clk_eee_enabled = true;
 748         }
 749
 750         reg = bcmgenet_umac_readl(priv, UMAC_EEE_CTRL);
 751         if (enable)
 752                 reg |= EEE_EN;
 753         else
 754                 reg &= ~EEE_EN;
 755         bcmgenet_umac_writel(priv, reg, UMAC_EEE_CTRL);
 756
 757         /* Enable EEE and switch to a 27Mhz clock automatically */
 758         reg = __raw_readl(priv->base + off);
 759         if (enable)
 760                 reg |= TBUF_EEE_EN | TBUF_PM_EN;
 761         else
 762                 reg &= ~(TBUF_EEE_EN | TBUF_PM_EN);
 763         __raw_writel(reg, priv->base + off);
 764
 765         /* Do the same for thing for RBUF */
 766         reg = bcmgenet_rbuf_readl(priv, RBUF_ENERGY_CTRL);
 767         if (enable)
 768                 reg |= RBUF_EEE_EN | RBUF_PM_EN;
 769         else
 770                 reg &= ~(RBUF_EEE_EN | RBUF_PM_EN);
 771         bcmgenet_rbuf_writel(priv, reg, RBUF_ENERGY_CTRL);
 772
 773         if (!enable && priv->clk_eee_enabled) {
 774                 clk_disable_unprepare(priv->clk_eee);
 775                 priv->clk_eee_enabled = false;
 776         }
 777
 778         priv->eee.eee_enabled = enable;
 779         priv->eee.eee_active = enable;
 780 }
 781
 782 static int bcmgenet_get_eee(struct net_device *dev, struct ethtool_eee *e)
 783 {
 784         struct bcmgenet_priv *priv = netdev_priv(dev);
 785         struct ethtool_eee *p = &priv->eee;
 786
 787         if (GENET_IS_V1(priv))
 788                 return -EOPNOTSUPP;
 789
 790         e->eee_enabled = p->eee_enabled;
 791         e->eee_active = p->eee_active;
 792         e->tx_lpi_timer = bcmgenet_umac_readl(priv, UMAC_EEE_LPI_TIMER);
 793
 794         return phy_ethtool_get_eee(priv->phydev, e);
 795 }
 796
 797 static int bcmgenet_set_eee(struct net_device *dev, struct ethtool_eee *e)
 798 {
 799         struct bcmgenet_priv *priv = netdev_priv(dev);
 800         struct ethtool_eee *p = &priv->eee;
 801         int ret = 0;
 802
 803         if (GENET_IS_V1(priv))
 804                 return -EOPNOTSUPP;
 805
 806         p->eee_enabled = e->eee_enabled;
 807
 808         if (!p->eee_enabled) {
 809                 bcmgenet_eee_enable_set(dev, false);
 810         } else {
 811                 ret = phy_init_eee(priv->phydev, 0);
 812                 if (ret) {
 813                         netif_err(priv, hw, dev, "EEE initialization failed\n");
 814                         return ret;
 815                 }
 816
 817                 bcmgenet_umac_writel(priv, e->tx_lpi_timer, UMAC_EEE_LPI_TIMER);
 818                 bcmgenet_eee_enable_set(dev, true);
 819         }
 820
 821         return phy_ethtool_set_eee(priv->phydev, e);
 822 }
 823
 824 static int bcmgenet_nway_reset(struct net_device *dev)
 825 {
 826         struct bcmgenet_priv *priv = netdev_priv(dev);
 827
 828         return genphy_restart_aneg(priv->phydev);
 829 }
 830
 831 /* standard ethtool support functions. */
 832 static struct ethtool_ops bcmgenet_ethtool_ops = {
 833         .get_strings            = bcmgenet_get_strings,
 834         .get_sset_count         = bcmgenet_get_sset_count,
 835         .get_ethtool_stats      = bcmgenet_get_ethtool_stats,
 836         .get_settings           = bcmgenet_get_settings,
 837         .set_settings           = bcmgenet_set_settings,
 838         .get_drvinfo            = bcmgenet_get_drvinfo,
 839         .get_link               = ethtool_op_get_link,
 840         .get_msglevel           = bcmgenet_get_msglevel,
 841         .set_msglevel           = bcmgenet_set_msglevel,
 842         .get_wol                = bcmgenet_get_wol,
 843         .set_wol                = bcmgenet_set_wol,
 844         .get_eee                = bcmgenet_get_eee,
 845         .set_eee                = bcmgenet_set_eee,
 846         .nway_reset             = bcmgenet_nway_reset,
 847 };
 848
 849 /* Power down the unimac, based on mode. */
 850 static int bcmgenet_power_down(struct bcmgenet_priv *priv,
 851                                 enum bcmgenet_power_mode mode)
 852 {
 853         int ret = 0;
 854         u32 reg;
 855
 856         switch (mode) {
 857         case GENET_POWER_CABLE_SENSE:
 858                 phy_detach(priv->phydev);
 859                 break;
 860
 861         case GENET_POWER_WOL_MAGIC:
 862                 ret = bcmgenet_wol_power_down_cfg(priv, mode);
 863                 break;
 864
 865         case GENET_POWER_PASSIVE:
 866                 /* Power down LED */
 867                 if (priv->hw_params->flags & GENET_HAS_EXT) {
 868                         reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
 869                         reg |= (EXT_PWR_DOWN_PHY |
 870                                 EXT_PWR_DOWN_DLL | EXT_PWR_DOWN_BIAS);
 871                         bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
 872
 873                         bcmgenet_phy_power_set(priv->dev, false);
 874                 }
 875                 break;
 876         default:
 877                 break;
 878         }
 879
 880         return 0;
 881 }
 882
 883 static void bcmgenet_power_up(struct bcmgenet_priv *priv,
 884                               enum bcmgenet_power_mode mode)
 885 {
 886         u32 reg;
 887
 888         if (!(priv->hw_params->flags & GENET_HAS_EXT))
 889                 return;
 890
 891         reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
 892
 893         switch (mode) {
 894         case GENET_POWER_PASSIVE:
 895                 reg &= ~(EXT_PWR_DOWN_DLL | EXT_PWR_DOWN_PHY |
 896                                 EXT_PWR_DOWN_BIAS);
 897                 /* fallthrough */
 898         case GENET_POWER_CABLE_SENSE:
 899                 /* enable APD */
 900                 reg |= EXT_PWR_DN_EN_LD;
 901                 break;
 902         case GENET_POWER_WOL_MAGIC:
 903                 bcmgenet_wol_power_up_cfg(priv, mode);
 904                 return;
 905         default:
 906                 break;
 907         }
 908
 909         bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
 910         if (mode == GENET_POWER_PASSIVE)
 911                 bcmgenet_phy_power_set(priv->dev, true);
 912 }
 913
 914 /* ioctl handle special commands that are not present in ethtool. */
 915 static int bcmgenet_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 916 {
 917         struct bcmgenet_priv *priv = netdev_priv(dev);
 918         int val = 0;
 919
 920         if (!netif_running(dev))
 921                 return -EINVAL;
 922
 923         switch (cmd) {
 924         case SIOCGMIIPHY:
 925         case SIOCGMIIREG:
 926         case SIOCSMIIREG:
 927                 if (!priv->phydev)
 928                         val = -ENODEV;
 929                 else
 930                         val = phy_mii_ioctl(priv->phydev, rq, cmd);
 931                 break;
 932
 933         default:
 934                 val = -EINVAL;
 935                 break;
 936         }
 937
 938         return val;
 939 }
 940
 941 static struct enet_cb *bcmgenet_get_txcb(struct bcmgenet_priv *priv,
 942                                          struct bcmgenet_tx_ring *ring)
 943 {
 944         struct enet_cb *tx_cb_ptr;
 945
 946         tx_cb_ptr = ring->cbs;
 947         tx_cb_ptr += ring->write_ptr - ring->cb_ptr;
 948
 949         /* Advancing local write pointer */
 950         if (ring->write_ptr == ring->end_ptr)
 951                 ring->write_ptr = ring->cb_ptr;
 952         else
 953                 ring->write_ptr++;
 954
 955         return tx_cb_ptr;
 956 }
 957
 958 /* Simple helper to free a control block's resources */
 959 static void bcmgenet_free_cb(struct enet_cb *cb)
 960 {
 961         dev_kfree_skb_any(cb->skb);
 962         cb->skb = NULL;
 963         dma_unmap_addr_set(cb, dma_addr, 0);
 964 }
 965
 966 static inline void bcmgenet_rx_ring16_int_disable(struct bcmgenet_rx_ring *ring)
 967 {
 968         bcmgenet_intrl2_0_writel(ring->priv, UMAC_IRQ_RXDMA_DONE,
 969                                  INTRL2_CPU_MASK_SET);
 970 }
 971
 972 static inline void bcmgenet_rx_ring16_int_enable(struct bcmgenet_rx_ring *ring)
 973 {
 974         bcmgenet_intrl2_0_writel(ring->priv, UMAC_IRQ_RXDMA_DONE,
 975                                  INTRL2_CPU_MASK_CLEAR);
 976 }
 977
 978 static inline void bcmgenet_rx_ring_int_disable(struct bcmgenet_rx_ring *ring)
 979 {
 980         bcmgenet_intrl2_1_writel(ring->priv,
 981                                  1 << (UMAC_IRQ1_RX_INTR_SHIFT + ring->index),
 982                                  INTRL2_CPU_MASK_SET);
 983 }
 984
 985 static inline void bcmgenet_rx_ring_int_enable(struct bcmgenet_rx_ring *ring)
 986 {
 987         bcmgenet_intrl2_1_writel(ring->priv,
 988                                  1 << (UMAC_IRQ1_RX_INTR_SHIFT + ring->index),
 989                                  INTRL2_CPU_MASK_CLEAR);
 990 }
 991
 992 static inline void bcmgenet_tx_ring16_int_disable(struct bcmgenet_tx_ring *ring)
 993 {
 994         bcmgenet_intrl2_0_writel(ring->priv, UMAC_IRQ_TXDMA_DONE,
 995                                  INTRL2_CPU_MASK_SET);
 996 }
 997
 998 static inline void bcmgenet_tx_ring16_int_enable(struct bcmgenet_tx_ring *ring)
 999 {
1000         bcmgenet_intrl2_0_writel(ring->priv, UMAC_IRQ_TXDMA_DONE,
1001                                  INTRL2_CPU_MASK_CLEAR);
1002 }
1003
1004 static inline void bcmgenet_tx_ring_int_enable(struct bcmgenet_tx_ring *ring)
1005 {
1006         bcmgenet_intrl2_1_writel(ring->priv, 1 << ring->index,
1007                                  INTRL2_CPU_MASK_CLEAR);
1008 }
1009
1010 static inline void bcmgenet_tx_ring_int_disable(struct bcmgenet_tx_ring *ring)
1011 {
1012         bcmgenet_intrl2_1_writel(ring->priv, 1 << ring->index,
1013                                  INTRL2_CPU_MASK_SET);
1014 }
1015
1016 /* Unlocked version of the reclaim routine */
1017 static unsigned int __bcmgenet_tx_reclaim(struct net_device *dev,
1018                                           struct bcmgenet_tx_ring *ring)
1019 {
1020         struct bcmgenet_priv *priv = netdev_priv(dev);
1021         struct enet_cb *tx_cb_ptr;
1022         struct netdev_queue *txq;
1023         unsigned int pkts_compl = 0;
1024         unsigned int c_index;
1025         unsigned int txbds_ready;
1026         unsigned int txbds_processed = 0;
1027
1028         /* Compute how many buffers are transmitted since last xmit call */
1029         c_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_CONS_INDEX);
1030         c_index &= DMA_C_INDEX_MASK;
1031
1032         if (likely(c_index >= ring->c_index))
1033                 txbds_ready = c_index - ring->c_index;
1034         else
1035                 txbds_ready = (DMA_C_INDEX_MASK + 1) - ring->c_index + c_index;
1036
1037         netif_dbg(priv, tx_done, dev,
1038                   "%s ring=%d old_c_index=%u c_index=%u txbds_ready=%u\n",
1039                   __func__, ring->index, ring->c_index, c_index, txbds_ready);
1040
1041         /* Reclaim transmitted buffers */
1042         while (txbds_processed < txbds_ready) {
1043                 tx_cb_ptr = &priv->tx_cbs[ring->clean_ptr];
1044                 if (tx_cb_ptr->skb) {
1045                         pkts_compl++;
1046                         dev->stats.tx_packets++;
1047                         dev->stats.tx_bytes += tx_cb_ptr->skb->len;
1048                         dma_unmap_single(&dev->dev,
1049                                          dma_unmap_addr(tx_cb_ptr, dma_addr),
1050                                          tx_cb_ptr->skb->len,
1051                                          DMA_TO_DEVICE);
1052                         bcmgenet_free_cb(tx_cb_ptr);
1053                 } else if (dma_unmap_addr(tx_cb_ptr, dma_addr)) {
1054                         dev->stats.tx_bytes +=
1055                                 dma_unmap_len(tx_cb_ptr, dma_len);
1056                         dma_unmap_page(&dev->dev,
1057                                        dma_unmap_addr(tx_cb_ptr, dma_addr),
1058                                        dma_unmap_len(tx_cb_ptr, dma_len),
1059                                        DMA_TO_DEVICE);
1060                         dma_unmap_addr_set(tx_cb_ptr, dma_addr, 0);
1061                 }
1062
1063                 txbds_processed++;
1064                 if (likely(ring->clean_ptr < ring->end_ptr))
1065                         ring->clean_ptr++;
1066                 else
1067                         ring->clean_ptr = ring->cb_ptr;
1068         }
1069
1070         ring->free_bds += txbds_processed;
1071         ring->c_index = (ring->c_index + txbds_processed) & DMA_C_INDEX_MASK;
1072
1073         if (ring->free_bds > (MAX_SKB_FRAGS + 1)) {
1074                 txq = netdev_get_tx_queue(dev, ring->queue);
1075                 if (netif_tx_queue_stopped(txq))
1076                         netif_tx_wake_queue(txq);
1077         }
1078
1079         return pkts_compl;
1080 }
1081
1082 static unsigned int bcmgenet_tx_reclaim(struct net_device *dev,
1083                                 struct bcmgenet_tx_ring *ring)
1084 {
1085         unsigned int released;
1086         unsigned long flags;
1087
1088         spin_lock_irqsave(&ring->lock, flags);
1089         released = __bcmgenet_tx_reclaim(dev, ring);
1090         spin_unlock_irqrestore(&ring->lock, flags);
1091
1092         return released;
1093 }
1094
1095 static int bcmgenet_tx_poll(struct napi_struct *napi, int budget)
1096 {
1097         struct bcmgenet_tx_ring *ring =
1098                 container_of(napi, struct bcmgenet_tx_ring, napi);
1099         unsigned int work_done = 0;
1100
1101         work_done = bcmgenet_tx_reclaim(ring->priv->dev, ring);
1102
1103         if (work_done == 0) {
1104                 napi_complete(napi);
1105                 ring->int_enable(ring);
1106
1107                 return 0;
1108         }
1109
1110         return budget;
1111 }
1112
1113 static void bcmgenet_tx_reclaim_all(struct net_device *dev)
1114 {
1115         struct bcmgenet_priv *priv = netdev_priv(dev);
1116         int i;
1117
1118         if (netif_is_multiqueue(dev)) {
1119                 for (i = 0; i < priv->hw_params->tx_queues; i++)
1120                         bcmgenet_tx_reclaim(dev, &priv->tx_rings[i]);
1121         }
1122
1123         bcmgenet_tx_reclaim(dev, &priv->tx_rings[DESC_INDEX]);
1124 }
1125
1126 /* Transmits a single SKB (either head of a fragment or a single SKB)
1127  * caller must hold priv->lock
1128  */
1129 static int bcmgenet_xmit_single(struct net_device *dev,
1130                                 struct sk_buff *skb,
1131                                 u16 dma_desc_flags,
1132                                 struct bcmgenet_tx_ring *ring)
1133 {
1134         struct bcmgenet_priv *priv = netdev_priv(dev);
1135         struct device *kdev = &priv->pdev->dev;
1136         struct enet_cb *tx_cb_ptr;
1137         unsigned int skb_len;
1138         dma_addr_t mapping;
1139         u32 length_status;
1140         int ret;
1141
1142         tx_cb_ptr = bcmgenet_get_txcb(priv, ring);
1143
1144         if (unlikely(!tx_cb_ptr))
1145                 BUG();
1146
1147         tx_cb_ptr->skb = skb;
1148
1149         skb_len = skb_headlen(skb) < ETH_ZLEN ? ETH_ZLEN : skb_headlen(skb);
1150
1151         mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
1152         ret = dma_mapping_error(kdev, mapping);
1153         if (ret) {
1154                 priv->mib.tx_dma_failed++;
1155                 netif_err(priv, tx_err, dev, "Tx DMA map failed\n");
1156                 dev_kfree_skb(skb);
1157                 return ret;
1158         }
1159
1160         dma_unmap_addr_set(tx_cb_ptr, dma_addr, mapping);
1161         dma_unmap_len_set(tx_cb_ptr, dma_len, skb->len);
1162         length_status = (skb_len << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
1163                         (priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT) |
1164                         DMA_TX_APPEND_CRC;
1165
1166         if (skb->ip_summed == CHECKSUM_PARTIAL)
1167                 length_status |= DMA_TX_DO_CSUM;
1168
1169         dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping, length_status);
1170
1171         return 0;
1172 }
1173
1174 /* Transmit a SKB fragment */
1175 static int bcmgenet_xmit_frag(struct net_device *dev,
1176                               skb_frag_t *frag,
1177                               u16 dma_desc_flags,
1178                               struct bcmgenet_tx_ring *ring)
1179 {
1180         struct bcmgenet_priv *priv = netdev_priv(dev);
1181         struct device *kdev = &priv->pdev->dev;
1182         struct enet_cb *tx_cb_ptr;
1183         dma_addr_t mapping;
1184         int ret;
1185
1186         tx_cb_ptr = bcmgenet_get_txcb(priv, ring);
1187
1188         if (unlikely(!tx_cb_ptr))
1189                 BUG();
1190         tx_cb_ptr->skb = NULL;
1191
1192         mapping = skb_frag_dma_map(kdev, frag, 0,
1193                                    skb_frag_size(frag), DMA_TO_DEVICE);
1194         ret = dma_mapping_error(kdev, mapping);
1195         if (ret) {
1196                 priv->mib.tx_dma_failed++;
1197                 netif_err(priv, tx_err, dev, "%s: Tx DMA map failed\n",
1198                           __func__);
1199                 return ret;
1200         }
1201
1202         dma_unmap_addr_set(tx_cb_ptr, dma_addr, mapping);
1203         dma_unmap_len_set(tx_cb_ptr, dma_len, frag->size);
1204
1205         dmadesc_set(priv, tx_cb_ptr->bd_addr, mapping,
1206                     (frag->size << DMA_BUFLENGTH_SHIFT) | dma_desc_flags |
1207                     (priv->hw_params->qtag_mask << DMA_TX_QTAG_SHIFT));
1208
1209         return 0;
1210 }
1211
1212 /* Reallocate the SKB to put enough headroom in front of it and insert
1213  * the transmit checksum offsets in the descriptors
1214  */
1215 static struct sk_buff *bcmgenet_put_tx_csum(struct net_device *dev,
1216                                             struct sk_buff *skb)
1217 {
1218         struct status_64 *status = NULL;
1219         struct sk_buff *new_skb;
1220         u16 offset;
1221         u8 ip_proto;
1222         u16 ip_ver;
1223         u32 tx_csum_info;
1224
1225         if (unlikely(skb_headroom(skb) < sizeof(*status))) {
1226                 /* If 64 byte status block enabled, must make sure skb has
1227                  * enough headroom for us to insert 64B status block.
1228                  */
1229                 new_skb = skb_realloc_headroom(skb, sizeof(*status));
1230                 dev_kfree_skb(skb);
1231                 if (!new_skb) {
1232                         dev->stats.tx_dropped++;
1233                         return NULL;
1234                 }
1235                 skb = new_skb;
1236         }
1237
1238         skb_push(skb, sizeof(*status));
1239         status = (struct status_64 *)skb->data;
1240
1241         if (skb->ip_summed  == CHECKSUM_PARTIAL) {
1242                 ip_ver = htons(skb->protocol);
1243                 switch (ip_ver) {
1244                 case ETH_P_IP:
1245                         ip_proto = ip_hdr(skb)->protocol;
1246                         break;
1247                 case ETH_P_IPV6:
1248                         ip_proto = ipv6_hdr(skb)->nexthdr;
1249                         break;
1250                 default:
1251                         return skb;
1252                 }
1253
1254                 offset = skb_checksum_start_offset(skb) - sizeof(*status);
1255                 tx_csum_info = (offset << STATUS_TX_CSUM_START_SHIFT) |
1256                                 (offset + skb->csum_offset);
1257
1258                 /* Set the length valid bit for TCP and UDP and just set
1259                  * the special UDP flag for IPv4, else just set to 0.
1260                  */
1261                 if (ip_proto == IPPROTO_TCP || ip_proto == IPPROTO_UDP) {
1262                         tx_csum_info |= STATUS_TX_CSUM_LV;
1263                         if (ip_proto == IPPROTO_UDP && ip_ver == ETH_P_IP)
1264                                 tx_csum_info |= STATUS_TX_CSUM_PROTO_UDP;
1265                 } else {
1266                         tx_csum_info = 0;
1267                 }
1268
1269                 status->tx_csum_info = tx_csum_info;
1270         }
1271
1272         return skb;
1273 }
1274
1275 static netdev_tx_t bcmgenet_xmit(struct sk_buff *skb, struct net_device *dev)
1276 {
1277         struct bcmgenet_priv *priv = netdev_priv(dev);
1278         struct bcmgenet_tx_ring *ring = NULL;
1279         struct netdev_queue *txq;
1280         unsigned long flags = 0;
1281         int nr_frags, index;
1282         u16 dma_desc_flags;
1283         int ret;
1284         int i;
1285
1286         index = skb_get_queue_mapping(skb);
1287         /* Mapping strategy:
1288          * queue_mapping = 0, unclassified, packet xmited through ring16
1289          * queue_mapping = 1, goes to ring 0. (highest priority queue
1290          * queue_mapping = 2, goes to ring 1.
1291          * queue_mapping = 3, goes to ring 2.
1292          * queue_mapping = 4, goes to ring 3.
1293          */
1294         if (index == 0)
1295                 index = DESC_INDEX;
1296         else
1297                 index -= 1;
1298
1299         nr_frags = skb_shinfo(skb)->nr_frags;
1300         ring = &priv->tx_rings[index];
1301         txq = netdev_get_tx_queue(dev, ring->queue);
1302
1303         spin_lock_irqsave(&ring->lock, flags);
1304         if (ring->free_bds <= nr_frags + 1) {
1305                 netif_tx_stop_queue(txq);
1306                 netdev_err(dev, "%s: tx ring %d full when queue %d awake\n",
1307                            __func__, index, ring->queue);
1308                 ret = NETDEV_TX_BUSY;
1309                 goto out;
1310         }
1311
1312         if (skb_padto(skb, ETH_ZLEN)) {
1313                 ret = NETDEV_TX_OK;
1314                 goto out;
1315         }
1316
1317         /* set the SKB transmit checksum */
1318         if (priv->desc_64b_en) {
1319                 skb = bcmgenet_put_tx_csum(dev, skb);
1320                 if (!skb) {
1321                         ret = NETDEV_TX_OK;
1322                         goto out;
1323                 }
1324         }
1325
1326         dma_desc_flags = DMA_SOP;
1327         if (nr_frags == 0)
1328                 dma_desc_flags |= DMA_EOP;
1329
1330         /* Transmit single SKB or head of fragment list */
1331         ret = bcmgenet_xmit_single(dev, skb, dma_desc_flags, ring);
1332         if (ret) {
1333                 ret = NETDEV_TX_OK;
1334                 goto out;
1335         }
1336
1337         /* xmit fragment */
1338         for (i = 0; i < nr_frags; i++) {
1339                 ret = bcmgenet_xmit_frag(dev,
1340                                          &skb_shinfo(skb)->frags[i],
1341                                          (i == nr_frags - 1) ? DMA_EOP : 0,
1342                                          ring);
1343                 if (ret) {
1344                         ret = NETDEV_TX_OK;
1345                         goto out;
1346                 }
1347         }
1348
1349         skb_tx_timestamp(skb);
1350
1351         /* Decrement total BD count and advance our write pointer */
1352         ring->free_bds -= nr_frags + 1;
1353         ring->prod_index += nr_frags + 1;
1354         ring->prod_index &= DMA_P_INDEX_MASK;
1355
1356         if (ring->free_bds <= (MAX_SKB_FRAGS + 1))
1357                 netif_tx_stop_queue(txq);
1358
1359         if (!skb->xmit_more || netif_xmit_stopped(txq))
1360                 /* Packets are ready, update producer index */
1361                 bcmgenet_tdma_ring_writel(priv, ring->index,
1362                                           ring->prod_index, TDMA_PROD_INDEX);
1363 out:
1364         spin_unlock_irqrestore(&ring->lock, flags);
1365
1366         return ret;
1367 }
1368
1369 static struct sk_buff *bcmgenet_rx_refill(struct bcmgenet_priv *priv,
1370                                           struct enet_cb *cb)
1371 {
1372         struct device *kdev = &priv->pdev->dev;
1373         struct sk_buff *skb;
1374         struct sk_buff *rx_skb;
1375         dma_addr_t mapping;
1376
1377         /* Allocate a new Rx skb */
1378         skb = netdev_alloc_skb(priv->dev, priv->rx_buf_len + SKB_ALIGNMENT);
1379         if (!skb) {
1380                 priv->mib.alloc_rx_buff_failed++;
1381                 netif_err(priv, rx_err, priv->dev,
1382                           "%s: Rx skb allocation failed\n", __func__);
1383                 return NULL;
1384         }
1385
1386         /* DMA-map the new Rx skb */
1387         mapping = dma_map_single(kdev, skb->data, priv->rx_buf_len,
1388                                  DMA_FROM_DEVICE);
1389         if (dma_mapping_error(kdev, mapping)) {
1390                 priv->mib.rx_dma_failed++;
1391                 dev_kfree_skb_any(skb);
1392                 netif_err(priv, rx_err, priv->dev,
1393                           "%s: Rx skb DMA mapping failed\n", __func__);
1394                 return NULL;
1395         }
1396
1397         /* Grab the current Rx skb from the ring and DMA-unmap it */
1398         rx_skb = cb->skb;
1399         if (likely(rx_skb))
1400                 dma_unmap_single(kdev, dma_unmap_addr(cb, dma_addr),
1401                                  priv->rx_buf_len, DMA_FROM_DEVICE);
1402
1403         /* Put the new Rx skb on the ring */
1404         cb->skb = skb;
1405         dma_unmap_addr_set(cb, dma_addr, mapping);
1406         dmadesc_set_addr(priv, cb->bd_addr, mapping);
1407
1408         /* Return the current Rx skb to caller */
1409         return rx_skb;
1410 }
1411
1412 /* bcmgenet_desc_rx - descriptor based rx process.
1413  * this could be called from bottom half, or from NAPI polling method.
1414  */
1415 static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring,
1416                                      unsigned int budget)
1417 {
1418         struct bcmgenet_priv *priv = ring->priv;
1419         struct net_device *dev = priv->dev;
1420         struct enet_cb *cb;
1421         struct sk_buff *skb;
1422         u32 dma_length_status;
1423         unsigned long dma_flag;
1424         int len;
1425         unsigned int rxpktprocessed = 0, rxpkttoprocess;
1426         unsigned int p_index;
1427         unsigned int discards;
1428         unsigned int chksum_ok = 0;
1429
1430         p_index = bcmgenet_rdma_ring_readl(priv, ring->index, RDMA_PROD_INDEX);
1431
1432         discards = (p_index >> DMA_P_INDEX_DISCARD_CNT_SHIFT) &
1433                    DMA_P_INDEX_DISCARD_CNT_MASK;
1434         if (discards > ring->old_discards) {
1435                 discards = discards - ring->old_discards;
1436                 dev->stats.rx_missed_errors += discards;
1437                 dev->stats.rx_errors += discards;
1438                 ring->old_discards += discards;
1439
1440                 /* Clear HW register when we reach 75% of maximum 0xFFFF */
1441                 if (ring->old_discards >= 0xC000) {
1442                         ring->old_discards = 0;
1443                         bcmgenet_rdma_ring_writel(priv, ring->index, 0,
1444                                                   RDMA_PROD_INDEX);
1445                 }
1446         }
1447
1448         p_index &= DMA_P_INDEX_MASK;
1449
1450         if (likely(p_index >= ring->c_index))
1451                 rxpkttoprocess = p_index - ring->c_index;
1452         else
1453                 rxpkttoprocess = (DMA_C_INDEX_MASK + 1) - ring->c_index +
1454                                  p_index;
1455
1456         netif_dbg(priv, rx_status, dev,
1457                   "RDMA: rxpkttoprocess=%d\n", rxpkttoprocess);
1458
1459         while ((rxpktprocessed < rxpkttoprocess) &&
1460                (rxpktprocessed < budget)) {
1461                 cb = &priv->rx_cbs[ring->read_ptr];
1462                 skb = bcmgenet_rx_refill(priv, cb);
1463
1464                 if (unlikely(!skb)) {
1465                         dev->stats.rx_dropped++;
1466                         goto next;
1467                 }
1468
1469                 if (!priv->desc_64b_en) {
1470                         dma_length_status =
1471                                 dmadesc_get_length_status(priv, cb->bd_addr);
1472                 } else {
1473                         struct status_64 *status;
1474
1475                         status = (struct status_64 *)skb->data;
1476                         dma_length_status = status->length_status;
1477                 }
1478
1479                 /* DMA flags and length are still valid no matter how
1480                  * we got the Receive Status Vector (64B RSB or register)
1481                  */
1482                 dma_flag = dma_length_status & 0xffff;
1483                 len = dma_length_status >> DMA_BUFLENGTH_SHIFT;
1484
1485                 netif_dbg(priv, rx_status, dev,
1486                           "%s:p_ind=%d c_ind=%d read_ptr=%d len_stat=0x%08x\n",
1487                           __func__, p_index, ring->c_index,
1488                           ring->read_ptr, dma_length_status);
1489
1490                 if (unlikely(!(dma_flag & DMA_EOP) || !(dma_flag & DMA_SOP))) {
1491                         netif_err(priv, rx_status, dev,
1492                                   "dropping fragmented packet!\n");
1493                         dev->stats.rx_errors++;
1494                         dev_kfree_skb_any(skb);
1495                         goto next;
1496                 }
1497
1498                 /* report errors */
1499                 if (unlikely(dma_flag & (DMA_RX_CRC_ERROR |
1500                                                 DMA_RX_OV |
1501                                                 DMA_RX_NO |
1502                                                 DMA_RX_LG |
1503                                                 DMA_RX_RXER))) {
1504                         netif_err(priv, rx_status, dev, "dma_flag=0x%x\n",
1505                                   (unsigned int)dma_flag);
1506                         if (dma_flag & DMA_RX_CRC_ERROR)
1507                                 dev->stats.rx_crc_errors++;
1508                         if (dma_flag & DMA_RX_OV)
1509                                 dev->stats.rx_over_errors++;
1510                         if (dma_flag & DMA_RX_NO)
1511                                 dev->stats.rx_frame_errors++;
1512                         if (dma_flag & DMA_RX_LG)
1513                                 dev->stats.rx_length_errors++;
1514                         dev->stats.rx_errors++;
1515                         dev_kfree_skb_any(skb);
1516                         goto next;
1517                 } /* error packet */
1518
1519                 chksum_ok = (dma_flag & priv->dma_rx_chk_bit) &&
1520                              priv->desc_rxchk_en;
1521
1522                 skb_put(skb, len);
1523                 if (priv->desc_64b_en) {
1524                         skb_pull(skb, 64);
1525                         len -= 64;
1526                 }
1527
1528                 if (likely(chksum_ok))
1529                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1530
1531                 /* remove hardware 2bytes added for IP alignment */
1532                 skb_pull(skb, 2);
1533                 len -= 2;
1534
1535                 if (priv->crc_fwd_en) {
1536                         skb_trim(skb, len - ETH_FCS_LEN);
1537                         len -= ETH_FCS_LEN;
1538                 }
1539
1540                 /*Finish setting up the received SKB and send it to the kernel*/
1541                 skb->protocol = eth_type_trans(skb, priv->dev);
1542                 dev->stats.rx_packets++;
1543                 dev->stats.rx_bytes += len;
1544                 if (dma_flag & DMA_RX_MULT)
1545                         dev->stats.multicast++;
1546
1547                 /* Notify kernel */
1548                 napi_gro_receive(&ring->napi, skb);
1549                 netif_dbg(priv, rx_status, dev, "pushed up to kernel\n");
1550
1551 next:
1552                 rxpktprocessed++;
1553                 if (likely(ring->read_ptr < ring->end_ptr))
1554                         ring->read_ptr++;
1555                 else
1556                         ring->read_ptr = ring->cb_ptr;
1557
1558                 ring->c_index = (ring->c_index + 1) & DMA_C_INDEX_MASK;
1559                 bcmgenet_rdma_ring_writel(priv, ring->index, ring->c_index, RDMA_CONS_INDEX);
1560         }
1561
1562         return rxpktprocessed;
1563 }
1564
1565 /* Rx NAPI polling method */
1566 static int bcmgenet_rx_poll(struct napi_struct *napi, int budget)
1567 {
1568         struct bcmgenet_rx_ring *ring = container_of(napi,
1569                         struct bcmgenet_rx_ring, napi);
1570         unsigned int work_done;
1571
1572         work_done = bcmgenet_desc_rx(ring, budget);
1573
1574         if (work_done < budget) {
1575                 napi_complete(napi);
1576                 ring->int_enable(ring);
1577         }
1578
1579         return work_done;
1580 }
1581
1582 /* Assign skb to RX DMA descriptor. */
1583 static int bcmgenet_alloc_rx_buffers(struct bcmgenet_priv *priv,
1584                                      struct bcmgenet_rx_ring *ring)
1585 {
1586         struct enet_cb *cb;
1587         struct sk_buff *skb;
1588         int i;
1589
1590         netif_dbg(priv, hw, priv->dev, "%s\n", __func__);
1591
1592         /* loop here for each buffer needing assign */
1593         for (i = 0; i < ring->size; i++) {
1594                 cb = ring->cbs + i;
1595                 skb = bcmgenet_rx_refill(priv, cb);
1596                 if (skb)
1597                         dev_kfree_skb_any(skb);
1598                 if (!cb->skb)
1599                         return -ENOMEM;
1600         }
1601
1602         return 0;
1603 }
1604
1605 static void bcmgenet_free_rx_buffers(struct bcmgenet_priv *priv)
1606 {
1607         struct enet_cb *cb;
1608         int i;
1609
1610         for (i = 0; i < priv->num_rx_bds; i++) {
1611                 cb = &priv->rx_cbs[i];
1612
1613                 if (dma_unmap_addr(cb, dma_addr)) {
1614                         dma_unmap_single(&priv->dev->dev,
1615                                          dma_unmap_addr(cb, dma_addr),
1616                                          priv->rx_buf_len, DMA_FROM_DEVICE);
1617                         dma_unmap_addr_set(cb, dma_addr, 0);
1618                 }
1619
1620                 if (cb->skb)
1621                         bcmgenet_free_cb(cb);
1622         }
1623 }
1624
1625 static void umac_enable_set(struct bcmgenet_priv *priv, u32 mask, bool enable)
1626 {
1627         u32 reg;
1628
1629         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
1630         if (enable)
1631                 reg |= mask;
1632         else
1633                 reg &= ~mask;
1634         bcmgenet_umac_writel(priv, reg, UMAC_CMD);
1635
1636         /* UniMAC stops on a packet boundary, wait for a full-size packet
1637          * to be processed
1638          */
1639         if (enable == 0)
1640                 usleep_range(1000, 2000);
1641 }
1642
1643 static int reset_umac(struct bcmgenet_priv *priv)
1644 {
1645         struct device *kdev = &priv->pdev->dev;
1646         unsigned int timeout = 0;
1647         u32 reg;
1648
1649         /* 7358a0/7552a0: bad default in RBUF_FLUSH_CTRL.umac_sw_rst */
1650         bcmgenet_rbuf_ctrl_set(priv, 0);
1651         udelay(10);
1652
1653         /* disable MAC while updating its registers */
1654         bcmgenet_umac_writel(priv, 0, UMAC_CMD);
1655
1656         /* issue soft reset, wait for it to complete */
1657         bcmgenet_umac_writel(priv, CMD_SW_RESET, UMAC_CMD);
1658         while (timeout++ < 1000) {
1659                 reg = bcmgenet_umac_readl(priv, UMAC_CMD);
1660                 if (!(reg & CMD_SW_RESET))
1661                         return 0;
1662
1663                 udelay(1);
1664         }
1665
1666         if (timeout == 1000) {
1667                 dev_err(kdev,
1668                         "timeout waiting for MAC to come out of reset\n");
1669                 return -ETIMEDOUT;
1670         }
1671
1672         return 0;
1673 }
1674
1675 static void bcmgenet_intr_disable(struct bcmgenet_priv *priv)
1676 {
1677         /* Mask all interrupts.*/
1678         bcmgenet_intrl2_0_writel(priv, 0xFFFFFFFF, INTRL2_CPU_MASK_SET);
1679         bcmgenet_intrl2_0_writel(priv, 0xFFFFFFFF, INTRL2_CPU_CLEAR);
1680         bcmgenet_intrl2_0_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1681         bcmgenet_intrl2_1_writel(priv, 0xFFFFFFFF, INTRL2_CPU_MASK_SET);
1682         bcmgenet_intrl2_1_writel(priv, 0xFFFFFFFF, INTRL2_CPU_CLEAR);
1683         bcmgenet_intrl2_1_writel(priv, 0, INTRL2_CPU_MASK_CLEAR);
1684 }
1685
1686 static int init_umac(struct bcmgenet_priv *priv)
1687 {
1688         struct device *kdev = &priv->pdev->dev;
1689         int ret;
1690         u32 reg;
1691         u32 int0_enable = 0;
1692         u32 int1_enable = 0;
1693         int i;
1694
1695         dev_dbg(&priv->pdev->dev, "bcmgenet: init_umac\n");
1696
1697         ret = reset_umac(priv);
1698         if (ret)
1699                 return ret;
1700
1701         bcmgenet_umac_writel(priv, 0, UMAC_CMD);
1702         /* clear tx/rx counter */
1703         bcmgenet_umac_writel(priv,
1704                              MIB_RESET_RX | MIB_RESET_TX | MIB_RESET_RUNT,
1705                              UMAC_MIB_CTRL);
1706         bcmgenet_umac_writel(priv, 0, UMAC_MIB_CTRL);
1707
1708         bcmgenet_umac_writel(priv, ENET_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
1709
1710         /* init rx registers, enable ip header optimization */
1711         reg = bcmgenet_rbuf_readl(priv, RBUF_CTRL);
1712         reg |= RBUF_ALIGN_2B;
1713         bcmgenet_rbuf_writel(priv, reg, RBUF_CTRL);
1714
1715         if (!GENET_IS_V1(priv) && !GENET_IS_V2(priv))
1716                 bcmgenet_rbuf_writel(priv, 1, RBUF_TBUF_SIZE_CTRL);
1717
1718         bcmgenet_intr_disable(priv);
1719
1720         /* Enable Rx default queue 16 interrupts */
1721         int0_enable |= UMAC_IRQ_RXDMA_DONE;
1722
1723         /* Enable Tx default queue 16 interrupts */
1724         int0_enable |= UMAC_IRQ_TXDMA_DONE;
1725
1726         /* Monitor cable plug/unplugged event for internal PHY */
1727         if (phy_is_internal(priv->phydev)) {
1728                 int0_enable |= UMAC_IRQ_LINK_EVENT;
1729         } else if (priv->ext_phy) {
1730                 int0_enable |= UMAC_IRQ_LINK_EVENT;
1731         } else if (priv->phy_interface == PHY_INTERFACE_MODE_MOCA) {
1732                 if (priv->hw_params->flags & GENET_HAS_MOCA_LINK_DET)
1733                         int0_enable |= UMAC_IRQ_LINK_EVENT;
1734
1735                 reg = bcmgenet_bp_mc_get(priv);
1736                 reg |= BIT(priv->hw_params->bp_in_en_shift);
1737
1738                 /* bp_mask: back pressure mask */
1739                 if (netif_is_multiqueue(priv->dev))
1740                         reg |= priv->hw_params->bp_in_mask;
1741                 else
1742                         reg &= ~priv->hw_params->bp_in_mask;
1743                 bcmgenet_bp_mc_set(priv, reg);
1744         }
1745
1746         /* Enable MDIO interrupts on GENET v3+ */
1747         if (priv->hw_params->flags & GENET_HAS_MDIO_INTR)
1748                 int0_enable |= (UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR);
1749
1750         /* Enable Rx priority queue interrupts */
1751         for (i = 0; i < priv->hw_params->rx_queues; ++i)
1752                 int1_enable |= (1 << (UMAC_IRQ1_RX_INTR_SHIFT + i));
1753
1754         /* Enable Tx priority queue interrupts */
1755         for (i = 0; i < priv->hw_params->tx_queues; ++i)
1756                 int1_enable |= (1 << i);
1757
1758         bcmgenet_intrl2_0_writel(priv, int0_enable, INTRL2_CPU_MASK_CLEAR);
1759         bcmgenet_intrl2_1_writel(priv, int1_enable, INTRL2_CPU_MASK_CLEAR);
1760
1761         /* Enable rx/tx engine.*/
1762         dev_dbg(kdev, "done init umac\n");
1763
1764         return 0;
1765 }
1766
1767 /* Initialize a Tx ring along with corresponding hardware registers */
1768 static void bcmgenet_init_tx_ring(struct bcmgenet_priv *priv,
1769                                   unsigned int index, unsigned int size,
1770                                   unsigned int start_ptr, unsigned int end_ptr)
1771 {
1772         struct bcmgenet_tx_ring *ring = &priv->tx_rings[index];
1773         u32 words_per_bd = WORDS_PER_BD(priv);
1774         u32 flow_period_val = 0;
1775
1776         spin_lock_init(&ring->lock);
1777         ring->priv = priv;
1778         ring->index = index;
1779         if (index == DESC_INDEX) {
1780                 ring->queue = 0;
1781                 ring->int_enable = bcmgenet_tx_ring16_int_enable;
1782                 ring->int_disable = bcmgenet_tx_ring16_int_disable;
1783         } else {
1784                 ring->queue = index + 1;
1785                 ring->int_enable = bcmgenet_tx_ring_int_enable;
1786                 ring->int_disable = bcmgenet_tx_ring_int_disable;
1787         }
1788         ring->cbs = priv->tx_cbs + start_ptr;
1789         ring->size = size;
1790         ring->clean_ptr = start_ptr;
1791         ring->c_index = 0;
1792         ring->free_bds = size;
1793         ring->write_ptr = start_ptr;
1794         ring->cb_ptr = start_ptr;
1795         ring->end_ptr = end_ptr - 1;
1796         ring->prod_index = 0;
1797
1798         /* Set flow period for ring != 16 */
1799         if (index != DESC_INDEX)
1800                 flow_period_val = ENET_MAX_MTU_SIZE << 16;
1801
1802         bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_PROD_INDEX);
1803         bcmgenet_tdma_ring_writel(priv, index, 0, TDMA_CONS_INDEX);
1804         bcmgenet_tdma_ring_writel(priv, index, 1, DMA_MBUF_DONE_THRESH);
1805         /* Disable rate control for now */
1806         bcmgenet_tdma_ring_writel(priv, index, flow_period_val,
1807                                   TDMA_FLOW_PERIOD);
1808         bcmgenet_tdma_ring_writel(priv, index,
1809                                   ((size << DMA_RING_SIZE_SHIFT) |
1810                                    RX_BUF_LENGTH), DMA_RING_BUF_SIZE);
1811
1812         /* Set start and end address, read and write pointers */
1813         bcmgenet_tdma_ring_writel(priv, index, start_ptr * words_per_bd,
1814                                   DMA_START_ADDR);
1815         bcmgenet_tdma_ring_writel(priv, index, start_ptr * words_per_bd,
1816                                   TDMA_READ_PTR);
1817         bcmgenet_tdma_ring_writel(priv, index, start_ptr * words_per_bd,
1818                                   TDMA_WRITE_PTR);
1819         bcmgenet_tdma_ring_writel(priv, index, end_ptr * words_per_bd - 1,
1820                                   DMA_END_ADDR);
1821 }
1822
1823 /* Initialize a RDMA ring */
1824 static int bcmgenet_init_rx_ring(struct bcmgenet_priv *priv,
1825                                  unsigned int index, unsigned int size,
1826                                  unsigned int start_ptr, unsigned int end_ptr)
1827 {
1828         struct bcmgenet_rx_ring *ring = &priv->rx_rings[index];
1829         u32 words_per_bd = WORDS_PER_BD(priv);
1830         int ret;
1831
1832         ring->priv = priv;
1833         ring->index = index;
1834         if (index == DESC_INDEX) {
1835                 ring->int_enable = bcmgenet_rx_ring16_int_enable;
1836                 ring->int_disable = bcmgenet_rx_ring16_int_disable;
1837         } else {
1838                 ring->int_enable = bcmgenet_rx_ring_int_enable;
1839                 ring->int_disable = bcmgenet_rx_ring_int_disable;
1840         }
1841         ring->cbs = priv->rx_cbs + start_ptr;
1842         ring->size = size;
1843         ring->c_index = 0;
1844         ring->read_ptr = start_ptr;
1845         ring->cb_ptr = start_ptr;
1846         ring->end_ptr = end_ptr - 1;
1847
1848         ret = bcmgenet_alloc_rx_buffers(priv, ring);
1849         if (ret)
1850                 return ret;
1851
1852         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_PROD_INDEX);
1853         bcmgenet_rdma_ring_writel(priv, index, 0, RDMA_CONS_INDEX);
1854         bcmgenet_rdma_ring_writel(priv, index, 1, DMA_MBUF_DONE_THRESH);
1855         bcmgenet_rdma_ring_writel(priv, index,
1856                                   ((size << DMA_RING_SIZE_SHIFT) |
1857                                    RX_BUF_LENGTH), DMA_RING_BUF_SIZE);
1858         bcmgenet_rdma_ring_writel(priv, index,
1859                                   (DMA_FC_THRESH_LO <<
1860                                    DMA_XOFF_THRESHOLD_SHIFT) |
1861                                    DMA_FC_THRESH_HI, RDMA_XON_XOFF_THRESH);
1862
1863         /* Set start and end address, read and write pointers */
1864         bcmgenet_rdma_ring_writel(priv, index, start_ptr * words_per_bd,
1865                                   DMA_START_ADDR);
1866         bcmgenet_rdma_ring_writel(priv, index, start_ptr * words_per_bd,
1867                                   RDMA_READ_PTR);
1868         bcmgenet_rdma_ring_writel(priv, index, start_ptr * words_per_bd,
1869                                   RDMA_WRITE_PTR);
1870         bcmgenet_rdma_ring_writel(priv, index, end_ptr * words_per_bd - 1,
1871                                   DMA_END_ADDR);
1872
1873         return ret;
1874 }
1875
1876 static void bcmgenet_init_tx_napi(struct bcmgenet_priv *priv)
1877 {
1878         unsigned int i;
1879         struct bcmgenet_tx_ring *ring;
1880
1881         for (i = 0; i < priv->hw_params->tx_queues; ++i) {
1882                 ring = &priv->tx_rings[i];
1883                 netif_napi_add(priv->dev, &ring->napi, bcmgenet_tx_poll, 64);
1884         }
1885
1886         ring = &priv->tx_rings[DESC_INDEX];
1887         netif_napi_add(priv->dev, &ring->napi, bcmgenet_tx_poll, 64);
1888 }
1889
1890 static void bcmgenet_enable_tx_napi(struct bcmgenet_priv *priv)
1891 {
1892         unsigned int i;
1893         struct bcmgenet_tx_ring *ring;
1894
1895         for (i = 0; i < priv->hw_params->tx_queues; ++i) {
1896                 ring = &priv->tx_rings[i];
1897                 napi_enable(&ring->napi);
1898         }
1899
1900         ring = &priv->tx_rings[DESC_INDEX];
1901         napi_enable(&ring->napi);
1902 }
1903
1904 static void bcmgenet_disable_tx_napi(struct bcmgenet_priv *priv)
1905 {
1906         unsigned int i;
1907         struct bcmgenet_tx_ring *ring;
1908
1909         for (i = 0; i < priv->hw_params->tx_queues; ++i) {
1910                 ring = &priv->tx_rings[i];
1911                 napi_disable(&ring->napi);
1912         }
1913
1914         ring = &priv->tx_rings[DESC_INDEX];
1915         napi_disable(&ring->napi);
1916 }
1917
1918 static void bcmgenet_fini_tx_napi(struct bcmgenet_priv *priv)
1919 {
1920         unsigned int i;
1921         struct bcmgenet_tx_ring *ring;
1922
1923         for (i = 0; i < priv->hw_params->tx_queues; ++i) {
1924                 ring = &priv->tx_rings[i];
1925                 netif_napi_del(&ring->napi);
1926         }
1927
1928         ring = &priv->tx_rings[DESC_INDEX];
1929         netif_napi_del(&ring->napi);
1930 }
1931
1932 /* Initialize Tx queues
1933  *
1934  * Queues 0-3 are priority-based, each one has 32 descriptors,
1935  * with queue 0 being the highest priority queue.
1936  *
1937  * Queue 16 is the default Tx queue with
1938  * GENET_Q16_TX_BD_CNT = 256 - 4 * 32 = 128 descriptors.
1939  *
1940  * The transmit control block pool is then partitioned as follows:
1941  * - Tx queue 0 uses tx_cbs[0..31]
1942  * - Tx queue 1 uses tx_cbs[32..63]
1943  * - Tx queue 2 uses tx_cbs[64..95]
1944  * - Tx queue 3 uses tx_cbs[96..127]
1945  * - Tx queue 16 uses tx_cbs[128..255]
1946  */
1947 static void bcmgenet_init_tx_queues(struct net_device *dev)
1948 {
1949         struct bcmgenet_priv *priv = netdev_priv(dev);
1950         u32 i, dma_enable;
1951         u32 dma_ctrl, ring_cfg;
1952         u32 dma_priority[3] = {0, 0, 0};
1953
1954         dma_ctrl = bcmgenet_tdma_readl(priv, DMA_CTRL);
1955         dma_enable = dma_ctrl & DMA_EN;
1956         dma_ctrl &= ~DMA_EN;
1957         bcmgenet_tdma_writel(priv, dma_ctrl, DMA_CTRL);
1958
1959         dma_ctrl = 0;
1960         ring_cfg = 0;
1961
1962         /* Enable strict priority arbiter mode */
1963         bcmgenet_tdma_writel(priv, DMA_ARBITER_SP, DMA_ARB_CTRL);
1964
1965         /* Initialize Tx priority queues */
1966         for (i = 0; i < priv->hw_params->tx_queues; i++) {
1967                 bcmgenet_init_tx_ring(priv, i, priv->hw_params->tx_bds_per_q,
1968                                       i * priv->hw_params->tx_bds_per_q,
1969                                       (i + 1) * priv->hw_params->tx_bds_per_q);
1970                 ring_cfg |= (1 << i);
1971                 dma_ctrl |= (1 << (i + DMA_RING_BUF_EN_SHIFT));
1972                 dma_priority[DMA_PRIO_REG_INDEX(i)] |=
1973                         ((GENET_Q0_PRIORITY + i) << DMA_PRIO_REG_SHIFT(i));
1974         }
1975
1976         /* Initialize Tx default queue 16 */
1977         bcmgenet_init_tx_ring(priv, DESC_INDEX, GENET_Q16_TX_BD_CNT,
1978                               priv->hw_params->tx_queues *
1979                               priv->hw_params->tx_bds_per_q,
1980                               TOTAL_DESC);
1981         ring_cfg |= (1 << DESC_INDEX);
1982         dma_ctrl |= (1 << (DESC_INDEX + DMA_RING_BUF_EN_SHIFT));
1983         dma_priority[DMA_PRIO_REG_INDEX(DESC_INDEX)] |=
1984                 ((GENET_Q0_PRIORITY + priv->hw_params->tx_queues) <<
1985                  DMA_PRIO_REG_SHIFT(DESC_INDEX));
1986
1987         /* Set Tx queue priorities */
1988         bcmgenet_tdma_writel(priv, dma_priority[0], DMA_PRIORITY_0);
1989         bcmgenet_tdma_writel(priv, dma_priority[1], DMA_PRIORITY_1);
1990         bcmgenet_tdma_writel(priv, dma_priority[2], DMA_PRIORITY_2);
1991
1992         /* Initialize Tx NAPI */
1993         bcmgenet_init_tx_napi(priv);
1994
1995         /* Enable Tx queues */
1996         bcmgenet_tdma_writel(priv, ring_cfg, DMA_RING_CFG);
1997
1998         /* Enable Tx DMA */
1999         if (dma_enable)
2000                 dma_ctrl |= DMA_EN;
2001         bcmgenet_tdma_writel(priv, dma_ctrl, DMA_CTRL);
2002 }
2003
2004 static void bcmgenet_init_rx_napi(struct bcmgenet_priv *priv)
2005 {
2006         unsigned int i;
2007         struct bcmgenet_rx_ring *ring;
2008
2009         for (i = 0; i < priv->hw_params->rx_queues; ++i) {
2010                 ring = &priv->rx_rings[i];
2011                 netif_napi_add(priv->dev, &ring->napi, bcmgenet_rx_poll, 64);
2012         }
2013
2014         ring = &priv->rx_rings[DESC_INDEX];
2015         netif_napi_add(priv->dev, &ring->napi, bcmgenet_rx_poll, 64);
2016 }
2017
2018 static void bcmgenet_enable_rx_napi(struct bcmgenet_priv *priv)
2019 {
2020         unsigned int i;
2021         struct bcmgenet_rx_ring *ring;
2022
2023         for (i = 0; i < priv->hw_params->rx_queues; ++i) {
2024                 ring = &priv->rx_rings[i];
2025                 napi_enable(&ring->napi);
2026         }
2027
2028         ring = &priv->rx_rings[DESC_INDEX];
2029         napi_enable(&ring->napi);
2030 }
2031
2032 static void bcmgenet_disable_rx_napi(struct bcmgenet_priv *priv)
2033 {
2034         unsigned int i;
2035         struct bcmgenet_rx_ring *ring;
2036
2037         for (i = 0; i < priv->hw_params->rx_queues; ++i) {
2038                 ring = &priv->rx_rings[i];
2039                 napi_disable(&ring->napi);
2040         }
2041
2042         ring = &priv->rx_rings[DESC_INDEX];
2043         napi_disable(&ring->napi);
2044 }
2045
2046 static void bcmgenet_fini_rx_napi(struct bcmgenet_priv *priv)
2047 {
2048         unsigned int i;
2049         struct bcmgenet_rx_ring *ring;
2050
2051         for (i = 0; i < priv->hw_params->rx_queues; ++i) {
2052                 ring = &priv->rx_rings[i];
2053                 netif_napi_del(&ring->napi);
2054         }
2055
2056         ring = &priv->rx_rings[DESC_INDEX];
2057         netif_napi_del(&ring->napi);
2058 }
2059
2060 /* Initialize Rx queues
2061  *
2062  * Queues 0-15 are priority queues. Hardware Filtering Block (HFB) can be
2063  * used to direct traffic to these queues.
2064  *
2065  * Queue 16 is the default Rx queue with GENET_Q16_RX_BD_CNT descriptors.
2066  */
2067 static int bcmgenet_init_rx_queues(struct net_device *dev)
2068 {
2069         struct bcmgenet_priv *priv = netdev_priv(dev);
2070         u32 i;
2071         u32 dma_enable;
2072         u32 dma_ctrl;
2073         u32 ring_cfg;
2074         int ret;
2075
2076         dma_ctrl = bcmgenet_rdma_readl(priv, DMA_CTRL);
2077         dma_enable = dma_ctrl & DMA_EN;
2078         dma_ctrl &= ~DMA_EN;
2079         bcmgenet_rdma_writel(priv, dma_ctrl, DMA_CTRL);
2080
2081         dma_ctrl = 0;
2082         ring_cfg = 0;
2083
2084         /* Initialize Rx priority queues */
2085         for (i = 0; i < priv->hw_params->rx_queues; i++) {
2086                 ret = bcmgenet_init_rx_ring(priv, i,
2087                                             priv->hw_params->rx_bds_per_q,
2088                                             i * priv->hw_params->rx_bds_per_q,
2089                                             (i + 1) *
2090                                             priv->hw_params->rx_bds_per_q);
2091                 if (ret)
2092                         return ret;
2093
2094                 ring_cfg |= (1 << i);
2095                 dma_ctrl |= (1 << (i + DMA_RING_BUF_EN_SHIFT));
2096         }
2097
2098         /* Initialize Rx default queue 16 */
2099         ret = bcmgenet_init_rx_ring(priv, DESC_INDEX, GENET_Q16_RX_BD_CNT,
2100                                     priv->hw_params->rx_queues *
2101                                     priv->hw_params->rx_bds_per_q,
2102                                     TOTAL_DESC);
2103         if (ret)
2104                 return ret;
2105
2106         ring_cfg |= (1 << DESC_INDEX);
2107         dma_ctrl |= (1 << (DESC_INDEX + DMA_RING_BUF_EN_SHIFT));
2108
2109         /* Initialize Rx NAPI */
2110         bcmgenet_init_rx_napi(priv);
2111
2112         /* Enable rings */
2113         bcmgenet_rdma_writel(priv, ring_cfg, DMA_RING_CFG);
2114
2115         /* Configure ring as descriptor ring and re-enable DMA if enabled */
2116         if (dma_enable)
2117                 dma_ctrl |= DMA_EN;
2118         bcmgenet_rdma_writel(priv, dma_ctrl, DMA_CTRL);
2119
2120         return 0;
2121 }
2122
2123 static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
2124 {
2125         int ret = 0;
2126         int timeout = 0;
2127         u32 reg;
2128
2129         /* Disable TDMA to stop add more frames in TX DMA */
2130         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
2131         reg &= ~DMA_EN;
2132         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
2133
2134         /* Check TDMA status register to confirm TDMA is disabled */
2135         while (timeout++ < DMA_TIMEOUT_VAL) {
2136                 reg = bcmgenet_tdma_readl(priv, DMA_STATUS);
2137                 if (reg & DMA_DISABLED)
2138                         break;
2139
2140                 udelay(1);
2141         }
2142
2143         if (timeout == DMA_TIMEOUT_VAL) {
2144                 netdev_warn(priv->dev, "Timed out while disabling TX DMA\n");
2145                 ret = -ETIMEDOUT;
2146         }
2147
2148         /* Wait 10ms for packet drain in both tx and rx dma */
2149         usleep_range(10000, 20000);
2150
2151         /* Disable RDMA */
2152         reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
2153         reg &= ~DMA_EN;
2154         bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
2155
2156         timeout = 0;
2157         /* Check RDMA status register to confirm RDMA is disabled */
2158         while (timeout++ < DMA_TIMEOUT_VAL) {
2159                 reg = bcmgenet_rdma_readl(priv, DMA_STATUS);
2160                 if (reg & DMA_DISABLED)
2161                         break;
2162
2163                 udelay(1);
2164         }
2165
2166         if (timeout == DMA_TIMEOUT_VAL) {
2167                 netdev_warn(priv->dev, "Timed out while disabling RX DMA\n");
2168                 ret = -ETIMEDOUT;
2169         }
2170
2171         return ret;
2172 }
2173
2174 static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
2175 {
2176         int i;
2177
2178         bcmgenet_fini_rx_napi(priv);
2179         bcmgenet_fini_tx_napi(priv);
2180
2181         /* disable DMA */
2182         bcmgenet_dma_teardown(priv);
2183
2184         for (i = 0; i < priv->num_tx_bds; i++) {
2185                 if (priv->tx_cbs[i].skb != NULL) {
2186                         dev_kfree_skb(priv->tx_cbs[i].skb);
2187                         priv->tx_cbs[i].skb = NULL;
2188                 }
2189         }
2190
2191         bcmgenet_free_rx_buffers(priv);
2192         kfree(priv->rx_cbs);
2193         kfree(priv->tx_cbs);
2194 }
2195
2196 /* init_edma: Initialize DMA control register */
2197 static int bcmgenet_init_dma(struct bcmgenet_priv *priv)
2198 {
2199         int ret;
2200         unsigned int i;
2201         struct enet_cb *cb;
2202
2203         netif_dbg(priv, hw, priv->dev, "%s\n", __func__);
2204
2205         /* Initialize common Rx ring structures */
2206         priv->rx_bds = priv->base + priv->hw_params->rdma_offset;
2207         priv->num_rx_bds = TOTAL_DESC;
2208         priv->rx_cbs = kcalloc(priv->num_rx_bds, sizeof(struct enet_cb),
2209                                GFP_KERNEL);
2210         if (!priv->rx_cbs)
2211                 return -ENOMEM;
2212
2213         for (i = 0; i < priv->num_rx_bds; i++) {
2214                 cb = priv->rx_cbs + i;
2215                 cb->bd_addr = priv->rx_bds + i * DMA_DESC_SIZE;
2216         }
2217
2218         /* Initialize common TX ring structures */
2219         priv->tx_bds = priv->base + priv->hw_params->tdma_offset;
2220         priv->num_tx_bds = TOTAL_DESC;
2221         priv->tx_cbs = kcalloc(priv->num_tx_bds, sizeof(struct enet_cb),
2222                                GFP_KERNEL);
2223         if (!priv->tx_cbs) {
2224                 kfree(priv->rx_cbs);
2225                 return -ENOMEM;
2226         }
2227
2228         for (i = 0; i < priv->num_tx_bds; i++) {
2229                 cb = priv->tx_cbs + i;
2230                 cb->bd_addr = priv->tx_bds + i * DMA_DESC_SIZE;
2231         }
2232
2233         /* Init rDma */
2234         bcmgenet_rdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);
2235
2236         /* Initialize Rx queues */
2237         ret = bcmgenet_init_rx_queues(priv->dev);
2238         if (ret) {
2239                 netdev_err(priv->dev, "failed to initialize Rx queues\n");
2240                 bcmgenet_free_rx_buffers(priv);
2241                 kfree(priv->rx_cbs);
2242                 kfree(priv->tx_cbs);
2243                 return ret;
2244         }
2245
2246         /* Init tDma */
2247         bcmgenet_tdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE);
2248
2249         /* Initialize Tx queues */
2250         bcmgenet_init_tx_queues(priv->dev);
2251
2252         return 0;
2253 }
2254
2255 /* Interrupt bottom half */
2256 static void bcmgenet_irq_task(struct work_struct *work)
2257 {
2258         struct bcmgenet_priv *priv = container_of(
2259                         work, struct bcmgenet_priv, bcmgenet_irq_work);
2260
2261         netif_dbg(priv, intr, priv->dev, "%s\n", __func__);
2262
2263         if (priv->irq0_stat & UMAC_IRQ_MPD_R) {
2264                 priv->irq0_stat &= ~UMAC_IRQ_MPD_R;
2265                 netif_dbg(priv, wol, priv->dev,
2266                           "magic packet detected, waking up\n");
2267                 bcmgenet_power_up(priv, GENET_POWER_WOL_MAGIC);
2268         }
2269
2270         /* Link UP/DOWN event */
2271         if ((priv->hw_params->flags & GENET_HAS_MDIO_INTR) &&
2272             (priv->irq0_stat & UMAC_IRQ_LINK_EVENT)) {
2273                 phy_mac_interrupt(priv->phydev,
2274                                   !!(priv->irq0_stat & UMAC_IRQ_LINK_UP));
2275                 priv->irq0_stat &= ~UMAC_IRQ_LINK_EVENT;
2276         }
2277 }
2278
2279 /* bcmgenet_isr1: handle Rx and Tx priority queues */
2280 static irqreturn_t bcmgenet_isr1(int irq, void *dev_id)
2281 {
2282         struct bcmgenet_priv *priv = dev_id;
2283         struct bcmgenet_rx_ring *rx_ring;
2284         struct bcmgenet_tx_ring *tx_ring;
2285         unsigned int index;
2286
2287         /* Save irq status for bottom-half processing. */
2288         priv->irq1_stat =
2289                 bcmgenet_intrl2_1_readl(priv, INTRL2_CPU_STAT) &
2290                 ~bcmgenet_intrl2_1_readl(priv, INTRL2_CPU_MASK_STATUS);
2291
2292         /* clear interrupts */
2293         bcmgenet_intrl2_1_writel(priv, priv->irq1_stat, INTRL2_CPU_CLEAR);
2294
2295         netif_dbg(priv, intr, priv->dev,
2296                   "%s: IRQ=0x%x\n", __func__, priv->irq1_stat);
2297
2298         /* Check Rx priority queue interrupts */
2299         for (index = 0; index < priv->hw_params->rx_queues; index++) {
2300                 if (!(priv->irq1_stat & BIT(UMAC_IRQ1_RX_INTR_SHIFT + index)))
2301                         continue;
2302
2303                 rx_ring = &priv->rx_rings[index];
2304
2305                 if (likely(napi_schedule_prep(&rx_ring->napi))) {
2306                         rx_ring->int_disable(rx_ring);
2307                         __napi_schedule(&rx_ring->napi);
2308                 }
2309         }
2310
2311         /* Check Tx priority queue interrupts */
2312         for (index = 0; index < priv->hw_params->tx_queues; index++) {
2313                 if (!(priv->irq1_stat & BIT(index)))
2314                         continue;
2315
2316                 tx_ring = &priv->tx_rings[index];
2317
2318                 if (likely(napi_schedule_prep(&tx_ring->napi))) {
2319                         tx_ring->int_disable(tx_ring);
2320                         __napi_schedule(&tx_ring->napi);
2321                 }
2322         }
2323
2324         return IRQ_HANDLED;
2325 }
2326
2327 /* bcmgenet_isr0: handle Rx and Tx default queues + other stuff */
2328 static irqreturn_t bcmgenet_isr0(int irq, void *dev_id)
2329 {
2330         struct bcmgenet_priv *priv = dev_id;
2331         struct bcmgenet_rx_ring *rx_ring;
2332         struct bcmgenet_tx_ring *tx_ring;
2333
2334         /* Save irq status for bottom-half processing. */
2335         priv->irq0_stat =
2336                 bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_STAT) &
2337                 ~bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
2338
2339         /* clear interrupts */
2340         bcmgenet_intrl2_0_writel(priv, priv->irq0_stat, INTRL2_CPU_CLEAR);
2341
2342         netif_dbg(priv, intr, priv->dev,
2343                   "IRQ=0x%x\n", priv->irq0_stat);
2344
2345         if (priv->irq0_stat & UMAC_IRQ_RXDMA_DONE) {
2346                 rx_ring = &priv->rx_rings[DESC_INDEX];
2347
2348                 if (likely(napi_schedule_prep(&rx_ring->napi))) {
2349                         rx_ring->int_disable(rx_ring);
2350                         __napi_schedule(&rx_ring->napi);
2351                 }
2352         }
2353
2354         if (priv->irq0_stat & UMAC_IRQ_TXDMA_DONE) {
2355                 tx_ring = &priv->tx_rings[DESC_INDEX];
2356
2357                 if (likely(napi_schedule_prep(&tx_ring->napi))) {
2358                         tx_ring->int_disable(tx_ring);
2359                         __napi_schedule(&tx_ring->napi);
2360                 }
2361         }
2362
2363         if (priv->irq0_stat & (UMAC_IRQ_PHY_DET_R |
2364                                 UMAC_IRQ_PHY_DET_F |
2365                                 UMAC_IRQ_LINK_EVENT |
2366                                 UMAC_IRQ_HFB_SM |
2367                                 UMAC_IRQ_HFB_MM |
2368                                 UMAC_IRQ_MPD_R)) {
2369                 /* all other interested interrupts handled in bottom half */
2370                 schedule_work(&priv->bcmgenet_irq_work);
2371         }
2372
2373         if ((priv->hw_params->flags & GENET_HAS_MDIO_INTR) &&
2374             priv->irq0_stat & (UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR)) {
2375                 priv->irq0_stat &= ~(UMAC_IRQ_MDIO_DONE | UMAC_IRQ_MDIO_ERROR);
2376                 wake_up(&priv->wq);
2377         }
2378
2379         return IRQ_HANDLED;
2380 }
2381
2382 static irqreturn_t bcmgenet_wol_isr(int irq, void *dev_id)
2383 {
2384         struct bcmgenet_priv *priv = dev_id;
2385
2386         pm_wakeup_event(&priv->pdev->dev, 0);
2387
2388         return IRQ_HANDLED;
2389 }
2390
2391 static void bcmgenet_umac_reset(struct bcmgenet_priv *priv)
2392 {
2393         u32 reg;
2394
2395         reg = bcmgenet_rbuf_ctrl_get(priv);
2396         reg |= BIT(1);
2397         bcmgenet_rbuf_ctrl_set(priv, reg);
2398         udelay(10);
2399
2400         reg &= ~BIT(1);
2401         bcmgenet_rbuf_ctrl_set(priv, reg);
2402         udelay(10);
2403 }
2404
2405 static void bcmgenet_set_hw_addr(struct bcmgenet_priv *priv,
2406                                  unsigned char *addr)
2407 {
2408         bcmgenet_umac_writel(priv, (addr[0] << 24) | (addr[1] << 16) |
2409                         (addr[2] << 8) | addr[3], UMAC_MAC0);
2410         bcmgenet_umac_writel(priv, (addr[4] << 8) | addr[5], UMAC_MAC1);
2411 }
2412
2413 /* Returns a reusable dma control register value */
2414 static u32 bcmgenet_dma_disable(struct bcmgenet_priv *priv)
2415 {
2416         u32 reg;
2417         u32 dma_ctrl;
2418
2419         /* disable DMA */
2420         dma_ctrl = 1 << (DESC_INDEX + DMA_RING_BUF_EN_SHIFT) | DMA_EN;
2421         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
2422         reg &= ~dma_ctrl;
2423         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
2424
2425         reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
2426         reg &= ~dma_ctrl;
2427         bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
2428
2429         bcmgenet_umac_writel(priv, 1, UMAC_TX_FLUSH);
2430         udelay(10);
2431         bcmgenet_umac_writel(priv, 0, UMAC_TX_FLUSH);
2432
2433         return dma_ctrl;
2434 }
2435
2436 static void bcmgenet_enable_dma(struct bcmgenet_priv *priv, u32 dma_ctrl)
2437 {
2438         u32 reg;
2439
2440         reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
2441         reg |= dma_ctrl;
2442         bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
2443
2444         reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
2445         reg |= dma_ctrl;
2446         bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
2447 }
2448
2449 static bool bcmgenet_hfb_is_filter_enabled(struct bcmgenet_priv *priv,
2450                                            u32 f_index)
2451 {
2452         u32 offset;
2453         u32 reg;
2454
2455         offset = HFB_FLT_ENABLE_V3PLUS + (f_index < 32) * sizeof(u32);
2456         reg = bcmgenet_hfb_reg_readl(priv, offset);
2457         return !!(reg & (1 << (f_index % 32)));
2458 }
2459
2460 static void bcmgenet_hfb_enable_filter(struct bcmgenet_priv *priv, u32 f_index)
2461 {
2462         u32 offset;
2463         u32 reg;
2464
2465         offset = HFB_FLT_ENABLE_V3PLUS + (f_index < 32) * sizeof(u32);
2466         reg = bcmgenet_hfb_reg_readl(priv, offset);
2467         reg |= (1 << (f_index % 32));
2468         bcmgenet_hfb_reg_writel(priv, reg, offset);
2469 }
2470
2471 static void bcmgenet_hfb_set_filter_rx_queue_mapping(struct bcmgenet_priv *priv,
2472                                                      u32 f_index, u32 rx_queue)
2473 {
2474         u32 offset;
2475         u32 reg;
2476
2477         offset = f_index / 8;
2478         reg = bcmgenet_rdma_readl(priv, DMA_INDEX2RING_0 + offset);
2479         reg &= ~(0xF << (4 * (f_index % 8)));
2480         reg |= ((rx_queue & 0xF) << (4 * (f_index % 8)));
2481         bcmgenet_rdma_writel(priv, reg, DMA_INDEX2RING_0 + offset);
2482 }
2483
2484 static void bcmgenet_hfb_set_filter_length(struct bcmgenet_priv *priv,
2485                                            u32 f_index, u32 f_length)
2486 {
2487         u32 offset;
2488         u32 reg;
2489
2490         offset = HFB_FLT_LEN_V3PLUS +
2491                  ((priv->hw_params->hfb_filter_cnt - 1 - f_index) / 4) *
2492                  sizeof(u32);
2493         reg = bcmgenet_hfb_reg_readl(priv, offset);
2494         reg &= ~(0xFF << (8 * (f_index % 4)));
2495         reg |= ((f_length & 0xFF) << (8 * (f_index % 4)));
2496         bcmgenet_hfb_reg_writel(priv, reg, offset);
2497 }
2498
2499 static int bcmgenet_hfb_find_unused_filter(struct bcmgenet_priv *priv)
2500 {
2501         u32 f_index;
2502
2503         for (f_index = 0; f_index < priv->hw_params->hfb_filter_cnt; f_index++)
2504                 if (!bcmgenet_hfb_is_filter_enabled(priv, f_index))
2505                         return f_index;
2506
2507         return -ENOMEM;
2508 }
2509
2510 /* bcmgenet_hfb_add_filter
2511  *
2512  * Add new filter to Hardware Filter Block to match and direct Rx traffic to
2513  * desired Rx queue.
2514  *
2515  * f_data is an array of unsigned 32-bit integers where each 32-bit integer
2516  * provides filter data for 2 bytes (4 nibbles) of Rx frame:
2517  *
2518  * bits 31:20 - unused
2519  * bit  19    - nibble 0 match enable
2520  * bit  18    - nibble 1 match enable
2521  * bit  17    - nibble 2 match enable
2522  * bit  16    - nibble 3 match enable
2523  * bits 15:12 - nibble 0 data
2524  * bits 11:8  - nibble 1 data
2525  * bits 7:4   - nibble 2 data
2526  * bits 3:0   - nibble 3 data
2527  *
2528  * Example:
2529  * In order to match:
2530  * - Ethernet frame type = 0x0800 (IP)
2531  * - IP version field = 4
2532  * - IP protocol field = 0x11 (UDP)
2533  *
2534  * The following filter is needed:
2535  * u32 hfb_filter_ipv4_udp[] = {
2536  *   Rx frame offset 0x00: 0x00000000, 0x00000000, 0x00000000, 0x00000000,
2537  *   Rx frame offset 0x08: 0x00000000, 0x00000000, 0x000F0800, 0x00084000,
2538  *   Rx frame offset 0x10: 0x00000000, 0x00000000, 0x00000000, 0x00030011,
2539  * };
2540  *
2541  * To add the filter to HFB and direct the traffic to Rx queue 0, call:
2542  * bcmgenet_hfb_add_filter(priv, hfb_filter_ipv4_udp,
2543  *                         ARRAY_SIZE(hfb_filter_ipv4_udp), 0);
2544  */
2545 int bcmgenet_hfb_add_filter(struct bcmgenet_priv *priv, u32 *f_data,
2546                             u32 f_length, u32 rx_queue)
2547 {
2548         int f_index;
2549         u32 i;
2550
2551         f_index = bcmgenet_hfb_find_unused_filter(priv);
2552         if (f_index < 0)
2553                 return -ENOMEM;
2554
2555         if (f_length > priv->hw_params->hfb_filter_size)
2556                 return -EINVAL;
2557
2558         for (i = 0; i < f_length; i++)
2559                 bcmgenet_hfb_writel(priv, f_data[i],
2560                         (f_index * priv->hw_params->hfb_filter_size + i) *
2561                         sizeof(u32));
2562
2563         bcmgenet_hfb_set_filter_length(priv, f_index, 2 * f_length);
2564         bcmgenet_hfb_set_filter_rx_queue_mapping(priv, f_index, rx_queue);
2565         bcmgenet_hfb_enable_filter(priv, f_index);
2566         bcmgenet_hfb_reg_writel(priv, 0x1, HFB_CTRL);
2567
2568         return 0;
2569 }
2570
2571 /* bcmgenet_hfb_clear
2572  *
2573  * Clear Hardware Filter Block and disable all filtering.
2574  */
2575 static void bcmgenet_hfb_clear(struct bcmgenet_priv *priv)
2576 {
2577         u32 i;
2578
2579         bcmgenet_hfb_reg_writel(priv, 0x0, HFB_CTRL);
2580         bcmgenet_hfb_reg_writel(priv, 0x0, HFB_FLT_ENABLE_V3PLUS);
2581         bcmgenet_hfb_reg_writel(priv, 0x0, HFB_FLT_ENABLE_V3PLUS + 4);
2582
2583         for (i = DMA_INDEX2RING_0; i <= DMA_INDEX2RING_7; i++)
2584                 bcmgenet_rdma_writel(priv, 0x0, i);
2585
2586         for (i = 0; i < (priv->hw_params->hfb_filter_cnt / 4); i++)
2587                 bcmgenet_hfb_reg_writel(priv, 0x0,
2588                                         HFB_FLT_LEN_V3PLUS + i * sizeof(u32));
2589
2590         for (i = 0; i < priv->hw_params->hfb_filter_cnt *
2591                         priv->hw_params->hfb_filter_size; i++)
2592                 bcmgenet_hfb_writel(priv, 0x0, i * sizeof(u32));
2593 }
2594
2595 static void bcmgenet_hfb_init(struct bcmgenet_priv *priv)
2596 {
2597         if (GENET_IS_V1(priv) || GENET_IS_V2(priv))
2598                 return;
2599
2600         bcmgenet_hfb_clear(priv);
2601 }
2602
2603 static void bcmgenet_netif_start(struct net_device *dev)
2604 {
2605         struct bcmgenet_priv *priv = netdev_priv(dev);
2606
2607         /* Start the network engine */
2608         bcmgenet_enable_rx_napi(priv);
2609         bcmgenet_enable_tx_napi(priv);
2610
2611         umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, true);
2612
2613         netif_tx_start_all_queues(dev);
2614
2615         phy_start(priv->phydev);
2616 }
2617
2618 static int bcmgenet_open(struct net_device *dev)
2619 {
2620         struct bcmgenet_priv *priv = netdev_priv(dev);
2621         unsigned long dma_ctrl;
2622         u32 reg;
2623         int ret;
2624
2625         netif_dbg(priv, ifup, dev, "bcmgenet_open\n");
2626
2627         /* Turn on the clock */
2628         if (!IS_ERR(priv->clk))
2629                 clk_prepare_enable(priv->clk);
2630
2631         /* If this is an internal GPHY, power it back on now, before UniMAC is
2632          * brought out of reset as absolutely no UniMAC activity is allowed
2633          */
2634         if (phy_is_internal(priv->phydev))
2635                 bcmgenet_power_up(priv, GENET_POWER_PASSIVE);
2636
2637         /* take MAC out of reset */
2638         bcmgenet_umac_reset(priv);
2639
2640         ret = init_umac(priv);
2641         if (ret)
2642                 goto err_clk_disable;
2643
2644         /* disable ethernet MAC while updating its registers */
2645         umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, false);
2646
2647         /* Make sure we reflect the value of CRC_CMD_FWD */
2648         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
2649         priv->crc_fwd_en = !!(reg & CMD_CRC_FWD);
2650
2651         bcmgenet_set_hw_addr(priv, dev->dev_addr);
2652
2653         if (phy_is_internal(priv->phydev)) {
2654                 reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
2655                 reg |= EXT_ENERGY_DET_MASK;
2656                 bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
2657         }
2658
2659         /* Disable RX/TX DMA and flush TX queues */
2660         dma_ctrl = bcmgenet_dma_disable(priv);
2661
2662         /* Reinitialize TDMA and RDMA and SW housekeeping */
2663         ret = bcmgenet_init_dma(priv);
2664         if (ret) {
2665                 netdev_err(dev, "failed to initialize DMA\n");
2666                 goto err_clk_disable;
2667         }
2668
2669         /* Always enable ring 16 - descriptor ring */
2670         bcmgenet_enable_dma(priv, dma_ctrl);
2671
2672         /* HFB init */
2673         bcmgenet_hfb_init(priv);
2674
2675         ret = request_irq(priv->irq0, bcmgenet_isr0, IRQF_SHARED,
2676                           dev->name, priv);
2677         if (ret < 0) {
2678                 netdev_err(dev, "can't request IRQ %d\n", priv->irq0);
2679                 goto err_fini_dma;
2680         }
2681
2682         ret = request_irq(priv->irq1, bcmgenet_isr1, IRQF_SHARED,
2683                           dev->name, priv);
2684         if (ret < 0) {
2685                 netdev_err(dev, "can't request IRQ %d\n", priv->irq1);
2686                 goto err_irq0;
2687         }
2688
2689         /* Re-configure the port multiplexer towards the PHY device */
2690         bcmgenet_mii_config(priv->dev, false);
2691
2692         phy_connect_direct(dev, priv->phydev, bcmgenet_mii_setup,
2693                            priv->phy_interface);
2694
2695         bcmgenet_netif_start(dev);
2696
2697         return 0;
2698
2699 err_irq0:
2700         free_irq(priv->irq0, priv);
2701 err_fini_dma:
2702         bcmgenet_fini_dma(priv);
2703 err_clk_disable:
2704         if (!IS_ERR(priv->clk))
2705                 clk_disable_unprepare(priv->clk);
2706         return ret;
2707 }
2708
2709 static void bcmgenet_netif_stop(struct net_device *dev)
2710 {
2711         struct bcmgenet_priv *priv = netdev_priv(dev);
2712
2713         netif_tx_stop_all_queues(dev);
2714         phy_stop(priv->phydev);
2715         bcmgenet_intr_disable(priv);
2716         bcmgenet_disable_rx_napi(priv);
2717         bcmgenet_disable_tx_napi(priv);
2718
2719         /* Wait for pending work items to complete. Since interrupts are
2720          * disabled no new work will be scheduled.
2721          */
2722         cancel_work_sync(&priv->bcmgenet_irq_work);
2723
2724         priv->old_link = -1;
2725         priv->old_speed = -1;
2726         priv->old_duplex = -1;
2727         priv->old_pause = -1;
2728 }
2729
2730 static int bcmgenet_close(struct net_device *dev)
2731 {
2732         struct bcmgenet_priv *priv = netdev_priv(dev);
2733         int ret;
2734
2735         netif_dbg(priv, ifdown, dev, "bcmgenet_close\n");
2736
2737         bcmgenet_netif_stop(dev);
2738
2739         /* Really kill the PHY state machine and disconnect from it */
2740         phy_disconnect(priv->phydev);
2741
2742         /* Disable MAC receive */
2743         umac_enable_set(priv, CMD_RX_EN, false);
2744
2745         ret = bcmgenet_dma_teardown(priv);
2746         if (ret)
2747                 return ret;
2748
2749         /* Disable MAC transmit. TX DMA disabled have to done before this */
2750         umac_enable_set(priv, CMD_TX_EN, false);
2751
2752         /* tx reclaim */
2753         bcmgenet_tx_reclaim_all(dev);
2754         bcmgenet_fini_dma(priv);
2755
2756         free_irq(priv->irq0, priv);
2757         free_irq(priv->irq1, priv);
2758
2759         if (phy_is_internal(priv->phydev))
2760                 ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
2761
2762         if (!IS_ERR(priv->clk))
2763                 clk_disable_unprepare(priv->clk);
2764
2765         return ret;
2766 }
2767
2768 static void bcmgenet_dump_tx_queue(struct bcmgenet_tx_ring *ring)
2769 {
2770         struct bcmgenet_priv *priv = ring->priv;
2771         u32 p_index, c_index, intsts, intmsk;
2772         struct netdev_queue *txq;
2773         unsigned int free_bds;
2774         unsigned long flags;
2775         bool txq_stopped;
2776
2777         if (!netif_msg_tx_err(priv))
2778                 return;
2779
2780         txq = netdev_get_tx_queue(priv->dev, ring->queue);
2781
2782         spin_lock_irqsave(&ring->lock, flags);
2783         if (ring->index == DESC_INDEX) {
2784                 intsts = ~bcmgenet_intrl2_0_readl(priv, INTRL2_CPU_MASK_STATUS);
2785                 intmsk = UMAC_IRQ_TXDMA_DONE | UMAC_IRQ_TXDMA_MBDONE;
2786         } else {
2787                 intsts = ~bcmgenet_intrl2_1_readl(priv, INTRL2_CPU_MASK_STATUS);
2788                 intmsk = 1 << ring->index;
2789         }
2790         c_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_CONS_INDEX);
2791         p_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_PROD_INDEX);
2792         txq_stopped = netif_tx_queue_stopped(txq);
2793         free_bds = ring->free_bds;
2794         spin_unlock_irqrestore(&ring->lock, flags);
2795
2796         netif_err(priv, tx_err, priv->dev, "Ring %d queue %d status summary\n"
2797                   "TX queue status: %s, interrupts: %s\n"
2798                   "(sw)free_bds: %d (sw)size: %d\n"
2799                   "(sw)p_index: %d (hw)p_index: %d\n"
2800                   "(sw)c_index: %d (hw)c_index: %d\n"
2801                   "(sw)clean_p: %d (sw)write_p: %d\n"
2802                   "(sw)cb_ptr: %d (sw)end_ptr: %d\n",
2803                   ring->index, ring->queue,
2804                   txq_stopped ? "stopped" : "active",
2805                   intsts & intmsk ? "enabled" : "disabled",
2806                   free_bds, ring->size,
2807                   ring->prod_index, p_index & DMA_P_INDEX_MASK,
2808                   ring->c_index, c_index & DMA_C_INDEX_MASK,
2809                   ring->clean_ptr, ring->write_ptr,
2810                   ring->cb_ptr, ring->end_ptr);
2811 }
2812
2813 static void bcmgenet_timeout(struct net_device *dev)
2814 {
2815         struct bcmgenet_priv *priv = netdev_priv(dev);
2816         u32 int0_enable = 0;
2817         u32 int1_enable = 0;
2818         unsigned int q;
2819
2820         netif_dbg(priv, tx_err, dev, "bcmgenet_timeout\n");
2821
2822         bcmgenet_disable_tx_napi(priv);
2823
2824         for (q = 0; q < priv->hw_params->tx_queues; q++)
2825                 bcmgenet_dump_tx_queue(&priv->tx_rings[q]);
2826         bcmgenet_dump_tx_queue(&priv->tx_rings[DESC_INDEX]);
2827
2828         bcmgenet_tx_reclaim_all(dev);
2829
2830         for (q = 0; q < priv->hw_params->tx_queues; q++)
2831                 int1_enable |= (1 << q);
2832
2833         int0_enable = UMAC_IRQ_TXDMA_DONE;
2834
2835         /* Re-enable TX interrupts if disabled */
2836         bcmgenet_intrl2_0_writel(priv, int0_enable, INTRL2_CPU_MASK_CLEAR);
2837         bcmgenet_intrl2_1_writel(priv, int1_enable, INTRL2_CPU_MASK_CLEAR);
2838
2839         bcmgenet_enable_tx_napi(priv);
2840
2841         dev->trans_start = jiffies;
2842
2843         dev->stats.tx_errors++;
2844
2845         netif_tx_wake_all_queues(dev);
2846 }
2847
2848 #define MAX_MC_COUNT    16
2849
2850 static inline void bcmgenet_set_mdf_addr(struct bcmgenet_priv *priv,
2851                                          unsigned char *addr,
2852                                          int *i,
2853                                          int *mc)
2854 {
2855         u32 reg;
2856
2857         bcmgenet_umac_writel(priv, addr[0] << 8 | addr[1],
2858                              UMAC_MDF_ADDR + (*i * 4));
2859         bcmgenet_umac_writel(priv, addr[2] << 24 | addr[3] << 16 |
2860                              addr[4] << 8 | addr[5],
2861                              UMAC_MDF_ADDR + ((*i + 1) * 4));
2862         reg = bcmgenet_umac_readl(priv, UMAC_MDF_CTRL);
2863         reg |= (1 << (MAX_MC_COUNT - *mc));
2864         bcmgenet_umac_writel(priv, reg, UMAC_MDF_CTRL);
2865         *i += 2;
2866         (*mc)++;
2867 }
2868
2869 static void bcmgenet_set_rx_mode(struct net_device *dev)
2870 {
2871         struct bcmgenet_priv *priv = netdev_priv(dev);
2872         struct netdev_hw_addr *ha;
2873         int i, mc;
2874         u32 reg;
2875
2876         netif_dbg(priv, hw, dev, "%s: %08X\n", __func__, dev->flags);
2877
2878         /* Promiscuous mode */
2879         reg = bcmgenet_umac_readl(priv, UMAC_CMD);
2880         if (dev->flags & IFF_PROMISC) {
2881                 reg |= CMD_PROMISC;
2882                 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
2883                 bcmgenet_umac_writel(priv, 0, UMAC_MDF_CTRL);
2884                 return;
2885         } else {
2886                 reg &= ~CMD_PROMISC;
2887                 bcmgenet_umac_writel(priv, reg, UMAC_CMD);
2888         }
2889
2890         /* UniMac doesn't support ALLMULTI */
2891         if (dev->flags & IFF_ALLMULTI) {
2892                 netdev_warn(dev, "ALLMULTI is not supported\n");
2893                 return;
2894         }
2895
2896         /* update MDF filter */
2897         i = 0;
2898         mc = 0;
2899         /* Broadcast */
2900         bcmgenet_set_mdf_addr(priv, dev->broadcast, &i, &mc);
2901         /* my own address.*/
2902         bcmgenet_set_mdf_addr(priv, dev->dev_addr, &i, &mc);
2903         /* Unicast list*/
2904         if (netdev_uc_count(dev) > (MAX_MC_COUNT - mc))
2905                 return;
2906
2907         if (!netdev_uc_empty(dev))
2908                 netdev_for_each_uc_addr(ha, dev)
2909                         bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
2910         /* Multicast */
2911         if (netdev_mc_empty(dev) || netdev_mc_count(dev) >= (MAX_MC_COUNT - mc))
2912                 return;
2913
2914         netdev_for_each_mc_addr(ha, dev)
2915                 bcmgenet_set_mdf_addr(priv, ha->addr, &i, &mc);
2916 }
2917
2918 /* Set the hardware MAC address. */
2919 static int bcmgenet_set_mac_addr(struct net_device *dev, void *p)
2920 {
2921         struct sockaddr *addr = p;
2922
2923         /* Setting the MAC address at the hardware level is not possible
2924          * without disabling the UniMAC RX/TX enable bits.
2925          */
2926         if (netif_running(dev))
2927                 return -EBUSY;
2928
2929         ether_addr_copy(dev->dev_addr, addr->sa_data);
2930
2931         return 0;
2932 }
2933
2934 static const struct net_device_ops bcmgenet_netdev_ops = {
2935         .ndo_open               = bcmgenet_open,
2936         .ndo_stop               = bcmgenet_close,
2937         .ndo_start_xmit         = bcmgenet_xmit,
2938         .ndo_tx_timeout         = bcmgenet_timeout,
2939         .ndo_set_rx_mode        = bcmgenet_set_rx_mode,
2940         .ndo_set_mac_address    = bcmgenet_set_mac_addr,
2941         .ndo_do_ioctl           = bcmgenet_ioctl,
2942         .ndo_set_features       = bcmgenet_set_features,
2943 };
2944
2945 /* Array of GENET hardware parameters/characteristics */
2946 static struct bcmgenet_hw_params bcmgenet_hw_params[] = {
2947         [GENET_V1] = {
2948                 .tx_queues = 0,
2949                 .tx_bds_per_q = 0,
2950                 .rx_queues = 0,
2951                 .rx_bds_per_q = 0,
2952                 .bp_in_en_shift = 16,
2953                 .bp_in_mask = 0xffff,
2954                 .hfb_filter_cnt = 16,
2955                 .qtag_mask = 0x1F,
2956                 .hfb_offset = 0x1000,
2957                 .rdma_offset = 0x2000,
2958                 .tdma_offset = 0x3000,
2959                 .words_per_bd = 2,
2960         },
2961         [GENET_V2] = {
2962                 .tx_queues = 4,
2963                 .tx_bds_per_q = 32,
2964                 .rx_queues = 0,
2965                 .rx_bds_per_q = 0,
2966                 .bp_in_en_shift = 16,
2967                 .bp_in_mask = 0xffff,
2968                 .hfb_filter_cnt = 16,
2969                 .qtag_mask = 0x1F,
2970                 .tbuf_offset = 0x0600,
2971                 .hfb_offset = 0x1000,
2972                 .hfb_reg_offset = 0x2000,
2973                 .rdma_offset = 0x3000,
2974                 .tdma_offset = 0x4000,
2975                 .words_per_bd = 2,
2976                 .flags = GENET_HAS_EXT,
2977         },
2978         [GENET_V3] = {
2979                 .tx_queues = 4,
2980                 .tx_bds_per_q = 32,
2981                 .rx_queues = 0,
2982                 .rx_bds_per_q = 0,
2983                 .bp_in_en_shift = 17,
2984                 .bp_in_mask = 0x1ffff,
2985                 .hfb_filter_cnt = 48,
2986                 .hfb_filter_size = 128,
2987                 .qtag_mask = 0x3F,
2988                 .tbuf_offset = 0x0600,
2989                 .hfb_offset = 0x8000,
2990                 .hfb_reg_offset = 0xfc00,
2991                 .rdma_offset = 0x10000,
2992                 .tdma_offset = 0x11000,
2993                 .words_per_bd = 2,
2994                 .flags = GENET_HAS_EXT | GENET_HAS_MDIO_INTR |
2995                          GENET_HAS_MOCA_LINK_DET,
2996         },
2997         [GENET_V4] = {
2998                 .tx_queues = 4,
2999                 .tx_bds_per_q = 32,
3000                 .rx_queues = 0,
3001                 .rx_bds_per_q = 0,
3002                 .bp_in_en_shift = 17,
3003                 .bp_in_mask = 0x1ffff,
3004                 .hfb_filter_cnt = 48,
3005                 .hfb_filter_size = 128,
3006                 .qtag_mask = 0x3F,
3007                 .tbuf_offset = 0x0600,
3008                 .hfb_offset = 0x8000,
3009                 .hfb_reg_offset = 0xfc00,
3010                 .rdma_offset = 0x2000,
3011                 .tdma_offset = 0x4000,
3012                 .words_per_bd = 3,
3013                 .flags = GENET_HAS_40BITS | GENET_HAS_EXT |
3014                          GENET_HAS_MDIO_INTR | GENET_HAS_MOCA_LINK_DET,
3015         },
3016 };
3017
3018 /* Infer hardware parameters from the detected GENET version */
3019 static void bcmgenet_set_hw_params(struct bcmgenet_priv *priv)
3020 {
3021         struct bcmgenet_hw_params *params;
3022         u32 reg;
3023         u8 major;
3024         u16 gphy_rev;
3025
3026         if (GENET_IS_V4(priv)) {
3027                 bcmgenet_dma_regs = bcmgenet_dma_regs_v3plus;
3028                 genet_dma_ring_regs = genet_dma_ring_regs_v4;
3029                 priv->dma_rx_chk_bit = DMA_RX_CHK_V3PLUS;
3030                 priv->version = GENET_V4;
3031         } else if (GENET_IS_V3(priv)) {
3032                 bcmgenet_dma_regs = bcmgenet_dma_regs_v3plus;
3033                 genet_dma_ring_regs = genet_dma_ring_regs_v123;
3034                 priv->dma_rx_chk_bit = DMA_RX_CHK_V3PLUS;
3035                 priv->version = GENET_V3;
3036         } else if (GENET_IS_V2(priv)) {
3037                 bcmgenet_dma_regs = bcmgenet_dma_regs_v2;
3038                 genet_dma_ring_regs = genet_dma_ring_regs_v123;
3039                 priv->dma_rx_chk_bit = DMA_RX_CHK_V12;
3040                 priv->version = GENET_V2;
3041         } else if (GENET_IS_V1(priv)) {
3042                 bcmgenet_dma_regs = bcmgenet_dma_regs_v1;
3043                 genet_dma_ring_regs = genet_dma_ring_regs_v123;
3044                 priv->dma_rx_chk_bit = DMA_RX_CHK_V12;
3045                 priv->version = GENET_V1;
3046         }
3047
3048         /* enum genet_version starts at 1 */
3049         priv->hw_params = &bcmgenet_hw_params[priv->version];
3050         params = priv->hw_params;
3051
3052         /* Read GENET HW version */
3053         reg = bcmgenet_sys_readl(priv, SYS_REV_CTRL);
3054         major = (reg >> 24 & 0x0f);
3055         if (major == 5)
3056                 major = 4;
3057         else if (major == 0)
3058                 major = 1;
3059         if (major != priv->version) {
3060                 dev_err(&priv->pdev->dev,
3061                         "GENET version mismatch, got: %d, configured for: %d\n",
3062                         major, priv->version);
3063         }
3064
3065         /* Print the GENET core version */
3066         dev_info(&priv->pdev->dev, "GENET " GENET_VER_FMT,
3067                  major, (reg >> 16) & 0x0f, reg & 0xffff);
3068
3069         /* Store the integrated PHY revision for the MDIO probing function
3070          * to pass this information to the PHY driver. The PHY driver expects
3071          * to find the PHY major revision in bits 15:8 while the GENET register
3072          * stores that information in bits 7:0, account for that.
3073          *
3074          * On newer chips, starting with PHY revision G0, a new scheme is
3075          * deployed similar to the Starfighter 2 switch with GPHY major
3076          * revision in bits 15:8 and patch level in bits 7:0. Major revision 0
3077          * is reserved as well as special value 0x01ff, we have a small
3078          * heuristic to check for the new GPHY revision and re-arrange things
3079          * so the GPHY driver is happy.
3080          */
3081         gphy_rev = reg & 0xffff;
3082
3083         /* This is the good old scheme, just GPHY major, no minor nor patch */
3084         if ((gphy_rev & 0xf0) != 0)
3085                 priv->gphy_rev = gphy_rev << 8;
3086
3087         /* This is the new scheme, GPHY major rolls over with 0x10 = rev G0 */
3088         else if ((gphy_rev & 0xff00) != 0)
3089                 priv->gphy_rev = gphy_rev;
3090
3091         /* This is reserved so should require special treatment */
3092         else if (gphy_rev == 0 || gphy_rev == 0x01ff) {
3093                 pr_warn("Invalid GPHY revision detected: 0x%04x\n", gphy_rev);
3094                 return;
3095         }
3096
3097 #ifdef CONFIG_PHYS_ADDR_T_64BIT
3098         if (!(params->flags & GENET_HAS_40BITS))
3099                 pr_warn("GENET does not support 40-bits PA\n");
3100 #endif
3101
3102         pr_debug("Configuration for version: %d\n"
3103                 "TXq: %1d, TXqBDs: %1d, RXq: %1d, RXqBDs: %1d\n"
3104                 "BP << en: %2d, BP msk: 0x%05x\n"
3105                 "HFB count: %2d, QTAQ msk: 0x%05x\n"
3106                 "TBUF: 0x%04x, HFB: 0x%04x, HFBreg: 0x%04x\n"
3107                 "RDMA: 0x%05x, TDMA: 0x%05x\n"
3108                 "Words/BD: %d\n",
3109                 priv->version,
3110                 params->tx_queues, params->tx_bds_per_q,
3111                 params->rx_queues, params->rx_bds_per_q,
3112                 params->bp_in_en_shift, params->bp_in_mask,
3113                 params->hfb_filter_cnt, params->qtag_mask,
3114                 params->tbuf_offset, params->hfb_offset,
3115                 params->hfb_reg_offset,
3116                 params->rdma_offset, params->tdma_offset,
3117                 params->words_per_bd);
3118 }
3119
3120 static const struct of_device_id bcmgenet_match[] = {
3121         { .compatible = "brcm,genet-v1", .data = (void *)GENET_V1 },
3122         { .compatible = "brcm,genet-v2", .data = (void *)GENET_V2 },
3123         { .compatible = "brcm,genet-v3", .data = (void *)GENET_V3 },
3124         { .compatible = "brcm,genet-v4", .data = (void *)GENET_V4 },
3125         { },
3126 };
3127
3128 static int bcmgenet_probe(struct platform_device *pdev)
3129 {
3130         struct bcmgenet_platform_data *pd = pdev->dev.platform_data;
3131         struct device_node *dn = pdev->dev.of_node;
3132         const struct of_device_id *of_id = NULL;
3133         struct bcmgenet_priv *priv;
3134         struct net_device *dev;
3135         const void *macaddr;
3136         struct resource *r;
3137         int err = -EIO;
3138
3139         /* Up to GENET_MAX_MQ_CNT + 1 TX queues and RX queues */
3140         dev = alloc_etherdev_mqs(sizeof(*priv), GENET_MAX_MQ_CNT + 1,
3141                                  GENET_MAX_MQ_CNT + 1);
3142         if (!dev) {
3143                 dev_err(&pdev->dev, "can't allocate net device\n");
3144                 return -ENOMEM;
3145         }
3146
3147         if (dn) {
3148                 of_id = of_match_node(bcmgenet_match, dn);
3149                 if (!of_id)
3150                         return -EINVAL;
3151         }
3152
3153         priv = netdev_priv(dev);
3154         priv->irq0 = platform_get_irq(pdev, 0);
3155         priv->irq1 = platform_get_irq(pdev, 1);
3156         priv->wol_irq = platform_get_irq(pdev, 2);
3157         if (!priv->irq0 || !priv->irq1) {
3158                 dev_err(&pdev->dev, "can't find IRQs\n");
3159                 err = -EINVAL;
3160                 goto err;
3161         }
3162
3163         if (dn) {
3164                 macaddr = of_get_mac_address(dn);
3165                 if (!macaddr) {
3166                         dev_err(&pdev->dev, "can't find MAC address\n");
3167                         err = -EINVAL;
3168                         goto err;
3169                 }
3170         } else {
3171                 macaddr = pd->mac_address;
3172         }
3173
3174         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
3175         priv->base = devm_ioremap_resource(&pdev->dev, r);
3176         if (IS_ERR(priv->base)) {
3177                 err = PTR_ERR(priv->base);
3178                 goto err;
3179         }
3180
3181         SET_NETDEV_DEV(dev, &pdev->dev);
3182         dev_set_drvdata(&pdev->dev, dev);
3183         ether_addr_copy(dev->dev_addr, macaddr);
3184         dev->watchdog_timeo = 2 * HZ;
3185         dev->ethtool_ops = &bcmgenet_ethtool_ops;
3186         dev->netdev_ops = &bcmgenet_netdev_ops;
3187
3188         priv->msg_enable = netif_msg_init(-1, GENET_MSG_DEFAULT);
3189
3190         /* Set hardware features */
3191         dev->hw_features |= NETIF_F_SG | NETIF_F_IP_CSUM |
3192                 NETIF_F_IPV6_CSUM | NETIF_F_RXCSUM;
3193
3194         /* Request the WOL interrupt and advertise suspend if available */
3195         priv->wol_irq_disabled = true;
3196         err = devm_request_irq(&pdev->dev, priv->wol_irq, bcmgenet_wol_isr, 0,
3197                                dev->name, priv);
3198         if (!err)
3199                 device_set_wakeup_capable(&pdev->dev, 1);
3200
3201         /* Set the needed headroom to account for any possible
3202          * features enabling/disabling at runtime
3203          */
3204         dev->needed_headroom += 64;
3205
3206         netdev_boot_setup_check(dev);
3207
3208         priv->dev = dev;
3209         priv->pdev = pdev;
3210         if (of_id)
3211                 priv->version = (enum bcmgenet_version)of_id->data;
3212         else
3213                 priv->version = pd->genet_version;
3214
3215         priv->clk = devm_clk_get(&priv->pdev->dev, "enet");
3216         if (IS_ERR(priv->clk))
3217                 dev_warn(&priv->pdev->dev, "failed to get enet clock\n");
3218
3219         if (!IS_ERR(priv->clk))
3220                 clk_prepare_enable(priv->clk);
3221
3222         bcmgenet_set_hw_params(priv);
3223
3224         /* Mii wait queue */
3225         init_waitqueue_head(&priv->wq);
3226         /* Always use RX_BUF_LENGTH (2KB) buffer for all chips */
3227         priv->rx_buf_len = RX_BUF_LENGTH;
3228         INIT_WORK(&priv->bcmgenet_irq_work, bcmgenet_irq_task);
3229
3230         priv->clk_wol = devm_clk_get(&priv->pdev->dev, "enet-wol");
3231         if (IS_ERR(priv->clk_wol))
3232                 dev_warn(&priv->pdev->dev, "failed to get enet-wol clock\n");
3233
3234         priv->clk_eee = devm_clk_get(&priv->pdev->dev, "enet-eee");
3235         if (IS_ERR(priv->clk_eee)) {
3236                 dev_warn(&priv->pdev->dev, "failed to get enet-eee clock\n");
3237                 priv->clk_eee = NULL;
3238         }
3239
3240         err = reset_umac(priv);
3241         if (err)
3242                 goto err_clk_disable;
3243
3244         err = bcmgenet_mii_init(dev);
3245         if (err)
3246                 goto err_clk_disable;
3247
3248         /* setup number of real queues  + 1 (GENET_V1 has 0 hardware queues
3249          * just the ring 16 descriptor based TX
3250          */
3251         netif_set_real_num_tx_queues(priv->dev, priv->hw_params->tx_queues + 1);
3252         netif_set_real_num_rx_queues(priv->dev, priv->hw_params->rx_queues + 1);
3253
3254         /* libphy will determine the link state */
3255         netif_carrier_off(dev);
3256
3257         /* Turn off the main clock, WOL clock is handled separately */
3258         if (!IS_ERR(priv->clk))
3259                 clk_disable_unprepare(priv->clk);
3260
3261         err = register_netdev(dev);
3262         if (err)
3263                 goto err;
3264
3265         return err;
3266
3267 err_clk_disable:
3268         if (!IS_ERR(priv->clk))
3269                 clk_disable_unprepare(priv->clk);
3270 err:
3271         free_netdev(dev);
3272         return err;
3273 }
3274
3275 static int bcmgenet_remove(struct platform_device *pdev)
3276 {
3277         struct bcmgenet_priv *priv = dev_to_priv(&pdev->dev);
3278
3279         dev_set_drvdata(&pdev->dev, NULL);
3280         unregister_netdev(priv->dev);
3281         bcmgenet_mii_exit(priv->dev);
3282         free_netdev(priv->dev);
3283
3284         return 0;
3285 }
3286
3287 #ifdef CONFIG_PM_SLEEP
3288 static int bcmgenet_suspend(struct device *d)
3289 {
3290         struct net_device *dev = dev_get_drvdata(d);
3291         struct bcmgenet_priv *priv = netdev_priv(dev);
3292         int ret;
3293
3294         if (!netif_running(dev))
3295                 return 0;
3296
3297         bcmgenet_netif_stop(dev);
3298
3299         phy_suspend(priv->phydev);
3300
3301         netif_device_detach(dev);
3302
3303         /* Disable MAC receive */
3304         umac_enable_set(priv, CMD_RX_EN, false);
3305
3306         ret = bcmgenet_dma_teardown(priv);
3307         if (ret)
3308                 return ret;
3309
3310         /* Disable MAC transmit. TX DMA disabled have to done before this */
3311         umac_enable_set(priv, CMD_TX_EN, false);
3312
3313         /* tx reclaim */
3314         bcmgenet_tx_reclaim_all(dev);
3315         bcmgenet_fini_dma(priv);
3316
3317         /* Prepare the device for Wake-on-LAN and switch to the slow clock */
3318         if (device_may_wakeup(d) && priv->wolopts) {
3319                 ret = bcmgenet_power_down(priv, GENET_POWER_WOL_MAGIC);
3320                 clk_prepare_enable(priv->clk_wol);
3321         } else if (phy_is_internal(priv->phydev)) {
3322                 ret = bcmgenet_power_down(priv, GENET_POWER_PASSIVE);
3323         }
3324
3325         /* Turn off the clocks */
3326         clk_disable_unprepare(priv->clk);
3327
3328         return ret;
3329 }
3330
3331 static int bcmgenet_resume(struct device *d)
3332 {
3333         struct net_device *dev = dev_get_drvdata(d);
3334         struct bcmgenet_priv *priv = netdev_priv(dev);
3335         unsigned long dma_ctrl;
3336         int ret;
3337         u32 reg;
3338
3339         if (!netif_running(dev))
3340                 return 0;
3341
3342         /* Turn on the clock */
3343         ret = clk_prepare_enable(priv->clk);
3344         if (ret)
3345                 return ret;
3346
3347         /* If this is an internal GPHY, power it back on now, before UniMAC is
3348          * brought out of reset as absolutely no UniMAC activity is allowed
3349          */
3350         if (phy_is_internal(priv->phydev))
3351                 bcmgenet_power_up(priv, GENET_POWER_PASSIVE);
3352
3353         bcmgenet_umac_reset(priv);
3354
3355         ret = init_umac(priv);
3356         if (ret)
3357                 goto out_clk_disable;
3358
3359         /* From WOL-enabled suspend, switch to regular clock */
3360         if (priv->wolopts)
3361                 clk_disable_unprepare(priv->clk_wol);
3362
3363         phy_init_hw(priv->phydev);
3364         /* Speed settings must be restored */
3365         bcmgenet_mii_config(priv->dev, false);
3366
3367         /* disable ethernet MAC while updating its registers */
3368         umac_enable_set(priv, CMD_TX_EN | CMD_RX_EN, false);
3369
3370         bcmgenet_set_hw_addr(priv, dev->dev_addr);
3371
3372         if (phy_is_internal(priv->phydev)) {
3373                 reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
3374                 reg |= EXT_ENERGY_DET_MASK;
3375                 bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
3376         }
3377
3378         if (priv->wolopts)
3379                 bcmgenet_power_up(priv, GENET_POWER_WOL_MAGIC);
3380
3381         /* Disable RX/TX DMA and flush TX queues */
3382         dma_ctrl = bcmgenet_dma_disable(priv);
3383
3384         /* Reinitialize TDMA and RDMA and SW housekeeping */
3385         ret = bcmgenet_init_dma(priv);
3386         if (ret) {
3387                 netdev_err(dev, "failed to initialize DMA\n");
3388                 goto out_clk_disable;
3389         }
3390
3391         /* Always enable ring 16 - descriptor ring */
3392         bcmgenet_enable_dma(priv, dma_ctrl);
3393
3394         netif_device_attach(dev);
3395
3396         phy_resume(priv->phydev);
3397
3398         if (priv->eee.eee_enabled)
3399                 bcmgenet_eee_enable_set(dev, true);
3400
3401         bcmgenet_netif_start(dev);
3402
3403         return 0;
3404
3405 out_clk_disable:
3406         clk_disable_unprepare(priv->clk);
3407         return ret;
3408 }
3409 #endif /* CONFIG_PM_SLEEP */
3410
3411 static SIMPLE_DEV_PM_OPS(bcmgenet_pm_ops, bcmgenet_suspend, bcmgenet_resume);
3412
3413 static struct platform_driver bcmgenet_driver = {
3414         .probe  = bcmgenet_probe,
3415         .remove = bcmgenet_remove,
3416         .driver = {
3417                 .name   = "bcmgenet",
3418                 .of_match_table = bcmgenet_match,
3419                 .pm     = &bcmgenet_pm_ops,
3420         },
3421 };
3422 module_platform_driver(bcmgenet_driver);
3423
3424 MODULE_AUTHOR("Broadcom Corporation");
3425 MODULE_DESCRIPTION("Broadcom GENET Ethernet controller driver");
3426 MODULE_ALIAS("platform:bcmgenet");
3427 MODULE_LICENSE("GPL");