target/linux/lantiq/patches-2.6.32/0011-MIPS-Lantiq-Add-ethernet-driver.patch

   1 From 435de86088af82496bcba69165cd7422bb4622ec Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Fri, 6 May 2011 00:10:01 +0200
   4 Subject: [PATCH 11/13] MIPS: Lantiq: Add ethernet driver
   5
   6 This patch adds the driver for the ETOP Packet Processing Engine (PPE32)
   7 found inside the XWAY family of Lantiq MIPS SoCs. This driver makes 100MBit
   8 ethernet work. Support for all 8 dma channels, gbit and the embedded switch
   9 found on the ar9/vr9 still needs to be implemented.
  10
  11 Signed-off-by: John Crispin <blogic@openwrt.org>
  12 Signed-off-by: Ralph Hempel <ralph.hempel@lantiq.com>
  13 Cc: linux-mips@linux-mips.org
  14 Cc: netdev@vger.kernel.org
  15 Patchwork: https://patchwork.linux-mips.org/patch/2357/
  16 Acked-by: David S. Miller <davem@davemloft.net>
  17 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
  18 ---
  19  .../mips/include/asm/mach-lantiq/lantiq_platform.h |    7 +
  20  .../mips/include/asm/mach-lantiq/xway/lantiq_soc.h |    4 +-
  21  arch/mips/lantiq/xway/devices.c                    |   23 +
  22  arch/mips/lantiq/xway/devices.h                    |    1 +
  23  drivers/net/Kconfig                                |    7 +
  24  drivers/net/Makefile                               |    1 +
  25  drivers/net/lantiq_etop.c                          |  805 ++++++++++++++++++++
  26  7 files changed, 846 insertions(+), 2 deletions(-)
  27  create mode 100644 drivers/net/lantiq_etop.c
  28
  29 --- a/arch/mips/include/asm/mach-lantiq/lantiq_platform.h
  30 +++ b/arch/mips/include/asm/mach-lantiq/lantiq_platform.h
  31 @@ -10,6 +10,7 @@
  32  #define _LANTIQ_PLATFORM_H__
  33
  34  #include <linux/mtd/partitions.h>
  35 +#include <linux/socket.h>
  36
  37  /* struct used to pass info to the pci core */
  38  enum {
  39 @@ -43,4 +44,10 @@
  40         int irq[16];
  41  };
  42
  43 +/* struct used to pass info to network drivers */
  44 +struct ltq_eth_data {
  45 +       struct sockaddr mac;
  46 +       int mii_mode;
  47 +};
  48 +
  49  #endif
  50 --- a/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
  51 +++ b/arch/mips/include/asm/mach-lantiq/xway/lantiq_soc.h
  52 @@ -82,8 +82,8 @@
  53  #define PMU_SWITCH             0x10000000
  54
  55  /* ETOP - ethernet */
  56 -#define LTQ_PPE32_BASE_ADDR    0xBE180000
  57 -#define LTQ_PPE32_SIZE         0x40000
  58 +#define LTQ_ETOP_BASE_ADDR     0x1E180000
  59 +#define LTQ_ETOP_SIZE          0x40000
  60
  61  /* DMA */
  62  #define LTQ_DMA_BASE_ADDR      0x1E104100
  63 --- a/arch/mips/lantiq/xway/devices.c
  64 +++ b/arch/mips/lantiq/xway/devices.c
  65 @@ -96,3 +96,26 @@
  66         platform_device_register_simple("ltq_asc", 0,
  67                 ltq_ase_asc_resources, ARRAY_SIZE(ltq_ase_asc_resources));
  68  }
  69 +
  70 +/* ethernet */
  71 +static struct resource ltq_etop_resources = {
  72 +       .name   = "etop",
  73 +       .start  = LTQ_ETOP_BASE_ADDR,
  74 +       .end    = LTQ_ETOP_BASE_ADDR + LTQ_ETOP_SIZE - 1,
  75 +       .flags  = IORESOURCE_MEM,
  76 +};
  77 +
  78 +static struct platform_device ltq_etop = {
  79 +       .name           = "ltq_etop",
  80 +       .resource       = &ltq_etop_resources,
  81 +       .num_resources  = 1,
  82 +};
  83 +
  84 +void __init
  85 +ltq_register_etop(struct ltq_eth_data *eth)
  86 +{
  87 +       if (eth) {
  88 +               ltq_etop.dev.platform_data = eth;
  89 +               platform_device_register(&ltq_etop);
  90 +       }
  91 +}
  92 --- a/arch/mips/lantiq/xway/devices.h
  93 +++ b/arch/mips/lantiq/xway/devices.h
  94 @@ -15,5 +15,6 @@
  95  extern void ltq_register_gpio(void);
  96  extern void ltq_register_gpio_stp(void);
  97  extern void ltq_register_ase_asc(void);
  98 +extern void ltq_register_etop(struct ltq_eth_data *eth);
  99
 100  #endif
 101 --- a/drivers/net/Kconfig
 102 +++ b/drivers/net/Kconfig
 103 @@ -1951,6 +1951,13 @@
 104           This driver supports the ethernet MACs in the Broadcom 63xx
 105           MIPS chipset family (BCM63XX).
 106
 107 +config LANTIQ_ETOP
 108 +       tristate "Lantiq SoC ETOP driver"
 109 +       depends on SOC_TYPE_XWAY
 110 +       help
 111 +         Support for the MII0 inside the Lantiq SoC
 112 +
 113 +
 114  source "drivers/net/fs_enet/Kconfig"
 115
 116  endif # NET_ETHERNET
 117 --- a/drivers/net/Makefile
 118 +++ b/drivers/net/Makefile
 119 @@ -246,6 +246,7 @@
 120  obj-$(CONFIG_MLX4_CORE) += mlx4/
 121  obj-$(CONFIG_ENC28J60) += enc28j60.o
 122  obj-$(CONFIG_ETHOC) += ethoc.o
 123 +obj-$(CONFIG_LANTIQ_ETOP) += lantiq_etop.o
 124
 125  obj-$(CONFIG_XTENSA_XT2000_SONIC) += xtsonic.o
 126
 127 --- /dev/null
 128 +++ b/drivers/net/lantiq_etop.c
 129 @@ -0,0 +1,814 @@
 130 +/*
 131 + *   This program is free software; you can redistribute it and/or modify it
 132 + *   under the terms of the GNU General Public License version 2 as published
 133 + *   by the Free Software Foundation.
 134 + *
 135 + *   This program is distributed in the hope that it will be useful,
 136 + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 137 + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 138 + *   GNU General Public License for more details.
 139 + *
 140 + *   You should have received a copy of the GNU General Public License
 141 + *   along with this program; if not, write to the Free Software
 142 + *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
 143 + *
 144 + *   Copyright (C) 2011 John Crispin <blogic@openwrt.org>
 145 + */
 146 +
 147 +#include <linux/kernel.h>
 148 +#include <linux/slab.h>
 149 +#include <linux/errno.h>
 150 +#include <linux/types.h>
 151 +#include <linux/interrupt.h>
 152 +#include <linux/uaccess.h>
 153 +#include <linux/in.h>
 154 +#include <linux/netdevice.h>
 155 +#include <linux/etherdevice.h>
 156 +#include <linux/phy.h>
 157 +#include <linux/ip.h>
 158 +#include <linux/tcp.h>
 159 +#include <linux/skbuff.h>
 160 +#include <linux/mm.h>
 161 +#include <linux/platform_device.h>
 162 +#include <linux/ethtool.h>
 163 +#include <linux/init.h>
 164 +#include <linux/delay.h>
 165 +#include <linux/io.h>
 166 +
 167 +#include <asm/checksum.h>
 168 +
 169 +#include <lantiq_soc.h>
 170 +#include <xway_dma.h>
 171 +#include <lantiq_platform.h>
 172 +
 173 +#define LTQ_ETOP_MDIO          0x11804
 174 +#define MDIO_REQUEST           0x80000000
 175 +#define MDIO_READ              0x40000000
 176 +#define MDIO_ADDR_MASK         0x1f
 177 +#define MDIO_ADDR_OFFSET       0x15
 178 +#define MDIO_REG_MASK          0x1f
 179 +#define MDIO_REG_OFFSET                0x10
 180 +#define MDIO_VAL_MASK          0xffff
 181 +
 182 +#define PPE32_CGEN             0x800
 183 +#define LTQ_PPE32_ENET_MAC_CFG 0x1840
 184 +
 185 +#define LTQ_ETOP_ENETS0                0x11850
 186 +#define LTQ_ETOP_MAC_DA0       0x1186C
 187 +#define LTQ_ETOP_MAC_DA1       0x11870
 188 +#define LTQ_ETOP_CFG           0x16020
 189 +#define LTQ_ETOP_IGPLEN                0x16080
 190 +
 191 +#define MAX_DMA_CHAN           0x8
 192 +#define MAX_DMA_CRC_LEN                0x4
 193 +#define MAX_DMA_DATA_LEN       0x600
 194 +
 195 +#define ETOP_FTCU              BIT(28)
 196 +#define ETOP_MII_MASK          0xf
 197 +#define ETOP_MII_NORMAL                0xd
 198 +#define ETOP_MII_REVERSE       0xe
 199 +#define ETOP_PLEN_UNDER                0x40
 200 +#define ETOP_CGEN              0x800
 201 +
 202 +/* use 2 static channels for TX/RX */
 203 +#define LTQ_ETOP_TX_CHANNEL    1
 204 +#define LTQ_ETOP_RX_CHANNEL    6
 205 +#define IS_TX(x)               (x == LTQ_ETOP_TX_CHANNEL)
 206 +#define IS_RX(x)               (x == LTQ_ETOP_RX_CHANNEL)
 207 +
 208 +#define ltq_etop_r32(x)                ltq_r32(ltq_etop_membase + (x))
 209 +#define ltq_etop_w32(x, y)     ltq_w32(x, ltq_etop_membase + (y))
 210 +#define ltq_etop_w32_mask(x, y, z)     \
 211 +               ltq_w32_mask(x, y, ltq_etop_membase + (z))
 212 +
 213 +#define DRV_VERSION    "1.0"
 214 +
 215 +#ifndef netdev_err
 216 +#define netdev_err(a, b, ...)  printk(b, ##__VA_ARGS__)
 217 +#endif
 218 +
 219 +#ifndef pr_warn
 220 +#define pr_warn pr_warning
 221 +#endif
 222 +
 223 +static void __iomem *ltq_etop_membase;
 224 +
 225 +struct ltq_etop_chan {
 226 +       int idx;
 227 +       int tx_free;
 228 +       struct net_device *netdev;
 229 +       struct napi_struct napi;
 230 +       struct ltq_dma_channel dma;
 231 +       struct sk_buff *skb[LTQ_DESC_NUM];
 232 +};
 233 +
 234 +struct ltq_etop_priv {
 235 +       struct net_device *netdev;
 236 +       struct ltq_eth_data *pldata;
 237 +       struct resource *res;
 238 +
 239 +       struct mii_bus *mii_bus;
 240 +       struct phy_device *phydev;
 241 +
 242 +       struct ltq_etop_chan ch[MAX_DMA_CHAN];
 243 +       int tx_free[MAX_DMA_CHAN >> 1];
 244 +
 245 +       spinlock_t lock;
 246 +};
 247 +
 248 +static int
 249 +ltq_etop_alloc_skb(struct ltq_etop_chan *ch)
 250 +{
 251 +       ch->skb[ch->dma.desc] = dev_alloc_skb(MAX_DMA_DATA_LEN);
 252 +       if (!ch->skb[ch->dma.desc])
 253 +               return -ENOMEM;
 254 +       ch->dma.desc_base[ch->dma.desc].addr = dma_map_single(NULL,
 255 +               ch->skb[ch->dma.desc]->data, MAX_DMA_DATA_LEN,
 256 +               DMA_FROM_DEVICE);
 257 +       ch->dma.desc_base[ch->dma.desc].addr =
 258 +               CPHYSADDR(ch->skb[ch->dma.desc]->data);
 259 +       ch->dma.desc_base[ch->dma.desc].ctl =
 260 +               LTQ_DMA_OWN | LTQ_DMA_RX_OFFSET(NET_IP_ALIGN) |
 261 +               MAX_DMA_DATA_LEN;
 262 +       skb_reserve(ch->skb[ch->dma.desc], NET_IP_ALIGN);
 263 +       return 0;
 264 +}
 265 +
 266 +static void
 267 +ltq_etop_hw_receive(struct ltq_etop_chan *ch)
 268 +{
 269 +       struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
 270 +       struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
 271 +       struct sk_buff *skb = ch->skb[ch->dma.desc];
 272 +       int len = (desc->ctl & LTQ_DMA_SIZE_MASK) - MAX_DMA_CRC_LEN;
 273 +       unsigned long flags;
 274 +
 275 +       spin_lock_irqsave(&priv->lock, flags);
 276 +       if (ltq_etop_alloc_skb(ch)) {
 277 +               netdev_err(ch->netdev,
 278 +                       "failed to allocate new rx buffer, stopping DMA\n");
 279 +               ltq_dma_close(&ch->dma);
 280 +       }
 281 +       ch->dma.desc++;
 282 +       ch->dma.desc %= LTQ_DESC_NUM;
 283 +       spin_unlock_irqrestore(&priv->lock, flags);
 284 +
 285 +       skb_put(skb, len);
 286 +       skb->dev = ch->netdev;
 287 +       skb->protocol = eth_type_trans(skb, ch->netdev);
 288 +       netif_receive_skb(skb);
 289 +}
 290 +
 291 +static int
 292 +ltq_etop_poll_rx(struct napi_struct *napi, int budget)
 293 +{
 294 +       struct ltq_etop_chan *ch = container_of(napi,
 295 +                               struct ltq_etop_chan, napi);
 296 +       int rx = 0;
 297 +       int complete = 0;
 298 +
 299 +       while ((rx < budget) && !complete) {
 300 +               struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
 301 +
 302 +               if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
 303 +                       ltq_etop_hw_receive(ch);
 304 +                       rx++;
 305 +               } else {
 306 +                       complete = 1;
 307 +               }
 308 +       }
 309 +       if (complete || !rx) {
 310 +               napi_complete(&ch->napi);
 311 +               ltq_dma_ack_irq(&ch->dma);
 312 +       }
 313 +       return rx;
 314 +}
 315 +
 316 +static int
 317 +ltq_etop_poll_tx(struct napi_struct *napi, int budget)
 318 +{
 319 +       struct ltq_etop_chan *ch =
 320 +               container_of(napi, struct ltq_etop_chan, napi);
 321 +       struct ltq_etop_priv *priv = netdev_priv(ch->netdev);
 322 +       struct netdev_queue *txq =
 323 +               netdev_get_tx_queue(ch->netdev, ch->idx >> 1);
 324 +       unsigned long flags;
 325 +
 326 +       spin_lock_irqsave(&priv->lock, flags);
 327 +       while ((ch->dma.desc_base[ch->tx_free].ctl &
 328 +                       (LTQ_DMA_OWN | LTQ_DMA_C)) == LTQ_DMA_C) {
 329 +               dev_kfree_skb_any(ch->skb[ch->tx_free]);
 330 +               ch->skb[ch->tx_free] = NULL;
 331 +               memset(&ch->dma.desc_base[ch->tx_free], 0,
 332 +                       sizeof(struct ltq_dma_desc));
 333 +               ch->tx_free++;
 334 +               ch->tx_free %= LTQ_DESC_NUM;
 335 +       }
 336 +       spin_unlock_irqrestore(&priv->lock, flags);
 337 +
 338 +       if (netif_tx_queue_stopped(txq))
 339 +               netif_tx_start_queue(txq);
 340 +       napi_complete(&ch->napi);
 341 +       ltq_dma_ack_irq(&ch->dma);
 342 +       return 1;
 343 +}
 344 +
 345 +static irqreturn_t
 346 +ltq_etop_dma_irq(int irq, void *_priv)
 347 +{
 348 +       struct ltq_etop_priv *priv = _priv;
 349 +       int ch = irq - LTQ_DMA_CH0_INT;
 350 +
 351 +       napi_schedule(&priv->ch[ch].napi);
 352 +       return IRQ_HANDLED;
 353 +}
 354 +
 355 +static void
 356 +ltq_etop_free_channel(struct net_device *dev, struct ltq_etop_chan *ch)
 357 +{
 358 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 359 +
 360 +       ltq_dma_free(&ch->dma);
 361 +       if (ch->dma.irq)
 362 +               free_irq(ch->dma.irq, priv);
 363 +       if (IS_RX(ch->idx)) {
 364 +               int desc;
 365 +               for (desc = 0; desc < LTQ_DESC_NUM; desc++)
 366 +                       dev_kfree_skb_any(ch->skb[ch->dma.desc]);
 367 +       }
 368 +}
 369 +
 370 +static void
 371 +ltq_etop_hw_exit(struct net_device *dev)
 372 +{
 373 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 374 +       int i;
 375 +
 376 +       ltq_pmu_disable(PMU_PPE);
 377 +       for (i = 0; i < MAX_DMA_CHAN; i++)
 378 +               if (IS_TX(i) || IS_RX(i))
 379 +                       ltq_etop_free_channel(dev, &priv->ch[i]);
 380 +}
 381 +
 382 +static int
 383 +ltq_etop_hw_init(struct net_device *dev)
 384 +{
 385 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 386 +       int i;
 387 +
 388 +       ltq_pmu_enable(PMU_PPE);
 389 +
 390 +       switch (priv->pldata->mii_mode) {
 391 +       case PHY_INTERFACE_MODE_RMII:
 392 +               ltq_etop_w32_mask(ETOP_MII_MASK,
 393 +                       ETOP_MII_REVERSE, LTQ_ETOP_CFG);
 394 +               break;
 395 +
 396 +       case PHY_INTERFACE_MODE_MII:
 397 +               ltq_etop_w32_mask(ETOP_MII_MASK,
 398 +                       ETOP_MII_NORMAL, LTQ_ETOP_CFG);
 399 +               break;
 400 +
 401 +       default:
 402 +               netdev_err(dev, "unknown mii mode %d\n",
 403 +                       priv->pldata->mii_mode);
 404 +               return -ENOTSUPP;
 405 +       }
 406 +
 407 +       /* enable crc generation */
 408 +       ltq_etop_w32(PPE32_CGEN, LTQ_PPE32_ENET_MAC_CFG);
 409 +
 410 +       ltq_dma_init_port(DMA_PORT_ETOP);
 411 +
 412 +       for (i = 0; i < MAX_DMA_CHAN; i++) {
 413 +               int irq = LTQ_DMA_CH0_INT + i;
 414 +               struct ltq_etop_chan *ch = &priv->ch[i];
 415 +
 416 +               ch->idx = ch->dma.nr = i;
 417 +
 418 +               if (IS_TX(i)) {
 419 +                       ltq_dma_alloc_tx(&ch->dma);
 420 +                       request_irq(irq, ltq_etop_dma_irq, IRQF_DISABLED,
 421 +                               "etop_tx", priv);
 422 +               } else if (IS_RX(i)) {
 423 +                       ltq_dma_alloc_rx(&ch->dma);
 424 +                       for (ch->dma.desc = 0; ch->dma.desc < LTQ_DESC_NUM;
 425 +                                       ch->dma.desc++)
 426 +                               if (ltq_etop_alloc_skb(ch))
 427 +                                       return -ENOMEM;
 428 +                       ch->dma.desc = 0;
 429 +                       request_irq(irq, ltq_etop_dma_irq, IRQF_DISABLED,
 430 +                               "etop_rx", priv);
 431 +               }
 432 +               ch->dma.irq = irq;
 433 +       }
 434 +       return 0;
 435 +}
 436 +
 437 +static void
 438 +ltq_etop_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 439 +{
 440 +       strcpy(info->driver, "Lantiq ETOP");
 441 +       strcpy(info->bus_info, "internal");
 442 +       strcpy(info->version, DRV_VERSION);
 443 +}
 444 +
 445 +static int
 446 +ltq_etop_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 447 +{
 448 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 449 +
 450 +       return phy_ethtool_gset(priv->phydev, cmd);
 451 +}
 452 +
 453 +static int
 454 +ltq_etop_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 455 +{
 456 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 457 +
 458 +       return phy_ethtool_sset(priv->phydev, cmd);
 459 +}
 460 +
 461 +static int
 462 +ltq_etop_nway_reset(struct net_device *dev)
 463 +{
 464 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 465 +
 466 +       return phy_start_aneg(priv->phydev);
 467 +}
 468 +
 469 +static const struct ethtool_ops ltq_etop_ethtool_ops = {
 470 +       .get_drvinfo = ltq_etop_get_drvinfo,
 471 +       .get_settings = ltq_etop_get_settings,
 472 +       .set_settings = ltq_etop_set_settings,
 473 +       .nway_reset = ltq_etop_nway_reset,
 474 +};
 475 +
 476 +static int
 477 +ltq_etop_mdio_wr(struct mii_bus *bus, int phy_addr, int phy_reg, u16 phy_data)
 478 +{
 479 +       u32 val = MDIO_REQUEST |
 480 +               ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
 481 +               ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET) |
 482 +               phy_data;
 483 +
 484 +       while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
 485 +               ;
 486 +       ltq_etop_w32(val, LTQ_ETOP_MDIO);
 487 +       return 0;
 488 +}
 489 +
 490 +static int
 491 +ltq_etop_mdio_rd(struct mii_bus *bus, int phy_addr, int phy_reg)
 492 +{
 493 +       u32 val = MDIO_REQUEST | MDIO_READ |
 494 +               ((phy_addr & MDIO_ADDR_MASK) << MDIO_ADDR_OFFSET) |
 495 +               ((phy_reg & MDIO_REG_MASK) << MDIO_REG_OFFSET);
 496 +
 497 +       while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
 498 +               ;
 499 +       ltq_etop_w32(val, LTQ_ETOP_MDIO);
 500 +       while (ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_REQUEST)
 501 +               ;
 502 +       val = ltq_etop_r32(LTQ_ETOP_MDIO) & MDIO_VAL_MASK;
 503 +       return val;
 504 +}
 505 +
 506 +static void
 507 +ltq_etop_mdio_link(struct net_device *dev)
 508 +{
 509 +       /* nothing to do  */
 510 +}
 511 +
 512 +static int
 513 +ltq_etop_mdio_probe(struct net_device *dev)
 514 +{
 515 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 516 +       struct phy_device *phydev = NULL;
 517 +       int phy_addr;
 518 +
 519 +       for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
 520 +               if (priv->mii_bus->phy_map[phy_addr]) {
 521 +                       phydev = priv->mii_bus->phy_map[phy_addr];
 522 +                       break;
 523 +               }
 524 +       }
 525 +
 526 +       if (!phydev) {
 527 +               netdev_err(dev, "no PHY found\n");
 528 +               return -ENODEV;
 529 +       }
 530 +
 531 +       phydev = phy_connect(dev, dev_name(&phydev->dev), &ltq_etop_mdio_link,
 532 +                       0, priv->pldata->mii_mode);
 533 +
 534 +       if (IS_ERR(phydev)) {
 535 +               netdev_err(dev, "Could not attach to PHY\n");
 536 +               return PTR_ERR(phydev);
 537 +       }
 538 +
 539 +       phydev->supported &= (SUPPORTED_10baseT_Half
 540 +                             | SUPPORTED_10baseT_Full
 541 +                             | SUPPORTED_100baseT_Half
 542 +                             | SUPPORTED_100baseT_Full
 543 +                             | SUPPORTED_Autoneg
 544 +                             | SUPPORTED_MII
 545 +                             | SUPPORTED_TP);
 546 +
 547 +       phydev->advertising = phydev->supported;
 548 +       priv->phydev = phydev;
 549 +       pr_info("%s: attached PHY [%s] (phy_addr=%s, irq=%d)\n",
 550 +              dev->name, phydev->drv->name,
 551 +              dev_name(&phydev->dev), phydev->irq);
 552 +
 553 +       return 0;
 554 +}
 555 +
 556 +static int
 557 +ltq_etop_mdio_init(struct net_device *dev)
 558 +{
 559 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 560 +       int i;
 561 +       int err;
 562 +
 563 +       priv->mii_bus = mdiobus_alloc();
 564 +       if (!priv->mii_bus) {
 565 +               netdev_err(dev, "failed to allocate mii bus\n");
 566 +               err = -ENOMEM;
 567 +               goto err_out;
 568 +       }
 569 +
 570 +       priv->mii_bus->priv = dev;
 571 +       priv->mii_bus->read = ltq_etop_mdio_rd;
 572 +       priv->mii_bus->write = ltq_etop_mdio_wr;
 573 +       priv->mii_bus->name = "ltq_mii";
 574 +       snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%x", 0);
 575 +       priv->mii_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
 576 +       if (!priv->mii_bus->irq) {
 577 +               err = -ENOMEM;
 578 +               goto err_out_free_mdiobus;
 579 +       }
 580 +
 581 +       for (i = 0; i < PHY_MAX_ADDR; ++i)
 582 +               priv->mii_bus->irq[i] = PHY_POLL;
 583 +
 584 +       if (mdiobus_register(priv->mii_bus)) {
 585 +               err = -ENXIO;
 586 +               goto err_out_free_mdio_irq;
 587 +       }
 588 +
 589 +       if (ltq_etop_mdio_probe(dev)) {
 590 +               err = -ENXIO;
 591 +               goto err_out_unregister_bus;
 592 +       }
 593 +       return 0;
 594 +
 595 +err_out_unregister_bus:
 596 +       mdiobus_unregister(priv->mii_bus);
 597 +err_out_free_mdio_irq:
 598 +       kfree(priv->mii_bus->irq);
 599 +err_out_free_mdiobus:
 600 +       mdiobus_free(priv->mii_bus);
 601 +err_out:
 602 +       return err;
 603 +}
 604 +
 605 +static void
 606 +ltq_etop_mdio_cleanup(struct net_device *dev)
 607 +{
 608 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 609 +
 610 +       phy_disconnect(priv->phydev);
 611 +       mdiobus_unregister(priv->mii_bus);
 612 +       kfree(priv->mii_bus->irq);
 613 +       mdiobus_free(priv->mii_bus);
 614 +}
 615 +
 616 +static int
 617 +ltq_etop_open(struct net_device *dev)
 618 +{
 619 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 620 +       int i;
 621 +
 622 +       for (i = 0; i < MAX_DMA_CHAN; i++) {
 623 +               struct ltq_etop_chan *ch = &priv->ch[i];
 624 +
 625 +               if (!IS_TX(i) && (!IS_RX(i)))
 626 +                       continue;
 627 +               ltq_dma_open(&ch->dma);
 628 +               napi_enable(&ch->napi);
 629 +       }
 630 +       phy_start(priv->phydev);
 631 +       netif_tx_start_all_queues(dev);
 632 +       return 0;
 633 +}
 634 +
 635 +static int
 636 +ltq_etop_stop(struct net_device *dev)
 637 +{
 638 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 639 +       int i;
 640 +
 641 +       netif_tx_stop_all_queues(dev);
 642 +       phy_stop(priv->phydev);
 643 +       for (i = 0; i < MAX_DMA_CHAN; i++) {
 644 +               struct ltq_etop_chan *ch = &priv->ch[i];
 645 +
 646 +               if (!IS_RX(i) && !IS_TX(i))
 647 +                       continue;
 648 +               napi_disable(&ch->napi);
 649 +               ltq_dma_close(&ch->dma);
 650 +       }
 651 +       return 0;
 652 +}
 653 +
 654 +static int
 655 +ltq_etop_tx(struct sk_buff *skb, struct net_device *dev)
 656 +{
 657 +       int queue = skb_get_queue_mapping(skb);
 658 +       struct netdev_queue *txq = netdev_get_tx_queue(dev, queue);
 659 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 660 +       struct ltq_etop_chan *ch = &priv->ch[(queue << 1) | 1];
 661 +       struct ltq_dma_desc *desc = &ch->dma.desc_base[ch->dma.desc];
 662 +       int len;
 663 +       unsigned long flags;
 664 +       u32 byte_offset;
 665 +
 666 +       len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len;
 667 +
 668 +       if ((desc->ctl & (LTQ_DMA_OWN | LTQ_DMA_C)) || ch->skb[ch->dma.desc]) {
 669 +               dev_kfree_skb_any(skb);
 670 +               netdev_err(dev, "tx ring full\n");
 671 +               netif_tx_stop_queue(txq);
 672 +               return NETDEV_TX_BUSY;
 673 +       }
 674 +
 675 +       /* dma needs to start on a 16 byte aligned address */
 676 +       byte_offset = CPHYSADDR(skb->data) % 16;
 677 +       ch->skb[ch->dma.desc] = skb;
 678 +
 679 +       dev->trans_start = jiffies;
 680 +
 681 +       spin_lock_irqsave(&priv->lock, flags);
 682 +       desc->addr = ((unsigned int) dma_map_single(NULL, skb->data, len,
 683 +                                               DMA_TO_DEVICE)) - byte_offset;
 684 +       wmb();
 685 +       desc->ctl = LTQ_DMA_OWN | LTQ_DMA_SOP | LTQ_DMA_EOP |
 686 +               LTQ_DMA_TX_OFFSET(byte_offset) | (len & LTQ_DMA_SIZE_MASK);
 687 +       ch->dma.desc++;
 688 +       ch->dma.desc %= LTQ_DESC_NUM;
 689 +       spin_unlock_irqrestore(&priv->lock, flags);
 690 +
 691 +       if (ch->dma.desc_base[ch->dma.desc].ctl & LTQ_DMA_OWN)
 692 +               netif_tx_stop_queue(txq);
 693 +
 694 +       return NETDEV_TX_OK;
 695 +}
 696 +
 697 +static int
 698 +ltq_etop_change_mtu(struct net_device *dev, int new_mtu)
 699 +{
 700 +       int ret = eth_change_mtu(dev, new_mtu);
 701 +
 702 +       if (!ret) {
 703 +               struct ltq_etop_priv *priv = netdev_priv(dev);
 704 +               unsigned long flags;
 705 +
 706 +               spin_lock_irqsave(&priv->lock, flags);
 707 +               ltq_etop_w32((ETOP_PLEN_UNDER << 16) | new_mtu,
 708 +                       LTQ_ETOP_IGPLEN);
 709 +               spin_unlock_irqrestore(&priv->lock, flags);
 710 +       }
 711 +       return ret;
 712 +}
 713 +
 714 +static int
 715 +ltq_etop_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
 716 +{
 717 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 718 +       struct mii_ioctl_data *data = if_mii(rq);
 719 +
 720 +       /* TODO: mii-toll reports "No MII transceiver present!." ?!*/
 721 +       return phy_mii_ioctl(priv->phydev, data, cmd);
 722 +}
 723 +
 724 +static int
 725 +ltq_etop_set_mac_address(struct net_device *dev, void *p)
 726 +{
 727 +       int ret = eth_mac_addr(dev, p);
 728 +
 729 +       if (!ret) {
 730 +               struct ltq_etop_priv *priv = netdev_priv(dev);
 731 +               unsigned long flags;
 732 +
 733 +               /* store the mac for the unicast filter */
 734 +               spin_lock_irqsave(&priv->lock, flags);
 735 +               ltq_etop_w32(*((u32 *)dev->dev_addr), LTQ_ETOP_MAC_DA0);
 736 +               ltq_etop_w32(*((u16 *)&dev->dev_addr[4]) << 16,
 737 +                       LTQ_ETOP_MAC_DA1);
 738 +               spin_unlock_irqrestore(&priv->lock, flags);
 739 +       }
 740 +       return ret;
 741 +}
 742 +
 743 +static void
 744 +ltq_etop_set_multicast_list(struct net_device *dev)
 745 +{
 746 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 747 +       unsigned long flags;
 748 +
 749 +       /* ensure that the unicast filter is not enabled in promiscious mode */
 750 +       spin_lock_irqsave(&priv->lock, flags);
 751 +       if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI))
 752 +               ltq_etop_w32_mask(ETOP_FTCU, 0, LTQ_ETOP_ENETS0);
 753 +       else
 754 +               ltq_etop_w32_mask(0, ETOP_FTCU, LTQ_ETOP_ENETS0);
 755 +       spin_unlock_irqrestore(&priv->lock, flags);
 756 +}
 757 +
 758 +static u16
 759 +ltq_etop_select_queue(struct net_device *dev, struct sk_buff *skb)
 760 +{
 761 +       /* we are currently only using the first queue */
 762 +       return 0;
 763 +}
 764 +
 765 +static int
 766 +ltq_etop_init(struct net_device *dev)
 767 +{
 768 +       struct ltq_etop_priv *priv = netdev_priv(dev);
 769 +       struct sockaddr mac;
 770 +       int err;
 771 +
 772 +       ether_setup(dev);
 773 +       dev->watchdog_timeo = 10 * HZ;
 774 +       err = ltq_etop_hw_init(dev);
 775 +       if (err)
 776 +               goto err_hw;
 777 +       ltq_etop_change_mtu(dev, 1500);
 778 +
 779 +       memcpy(&mac, &priv->pldata->mac, sizeof(struct sockaddr));
 780 +       if (!is_valid_ether_addr(mac.sa_data)) {
 781 +               pr_warn("etop: invalid MAC, using random\n");
 782 +               random_ether_addr(mac.sa_data);
 783 +       }
 784 +
 785 +       err = ltq_etop_set_mac_address(dev, &mac);
 786 +       if (err)
 787 +               goto err_netdev;
 788 +       ltq_etop_set_multicast_list(dev);
 789 +       err = ltq_etop_mdio_init(dev);
 790 +       if (err)
 791 +               goto err_netdev;
 792 +       return 0;
 793 +
 794 +err_netdev:
 795 +       unregister_netdev(dev);
 796 +       free_netdev(dev);
 797 +err_hw:
 798 +       ltq_etop_hw_exit(dev);
 799 +       return err;
 800 +}
 801 +
 802 +static void
 803 +ltq_etop_tx_timeout(struct net_device *dev)
 804 +{
 805 +       int err;
 806 +
 807 +       ltq_etop_hw_exit(dev);
 808 +       err = ltq_etop_hw_init(dev);
 809 +       if (err)
 810 +               goto err_hw;
 811 +       dev->trans_start = jiffies;
 812 +       netif_wake_queue(dev);
 813 +       return;
 814 +
 815 +err_hw:
 816 +       ltq_etop_hw_exit(dev);
 817 +       netdev_err(dev, "failed to restart etop after TX timeout\n");
 818 +}
 819 +
 820 +static const struct net_device_ops ltq_eth_netdev_ops = {
 821 +       .ndo_open = ltq_etop_open,
 822 +       .ndo_stop = ltq_etop_stop,
 823 +       .ndo_start_xmit = ltq_etop_tx,
 824 +       .ndo_change_mtu = ltq_etop_change_mtu,
 825 +       .ndo_do_ioctl = ltq_etop_ioctl,
 826 +       .ndo_set_mac_address = ltq_etop_set_mac_address,
 827 +       .ndo_validate_addr = eth_validate_addr,
 828 +       .ndo_set_multicast_list = ltq_etop_set_multicast_list,
 829 +       .ndo_select_queue = ltq_etop_select_queue,
 830 +       .ndo_init = ltq_etop_init,
 831 +       .ndo_tx_timeout = ltq_etop_tx_timeout,
 832 +};
 833 +
 834 +static int __init
 835 +ltq_etop_probe(struct platform_device *pdev)
 836 +{
 837 +       struct net_device *dev;
 838 +       struct ltq_etop_priv *priv;
 839 +       struct resource *res;
 840 +       int err;
 841 +       int i;
 842 +
 843 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 844 +       if (!res) {
 845 +               dev_err(&pdev->dev, "failed to get etop resource\n");
 846 +               err = -ENOENT;
 847 +               goto err_out;
 848 +       }
 849 +
 850 +       res = devm_request_mem_region(&pdev->dev, res->start,
 851 +               resource_size(res), dev_name(&pdev->dev));
 852 +       if (!res) {
 853 +               dev_err(&pdev->dev, "failed to request etop resource\n");
 854 +               err = -EBUSY;
 855 +               goto err_out;
 856 +       }
 857 +
 858 +       ltq_etop_membase = devm_ioremap_nocache(&pdev->dev,
 859 +               res->start, resource_size(res));
 860 +       if (!ltq_etop_membase) {
 861 +               dev_err(&pdev->dev, "failed to remap etop engine %d\n",
 862 +                       pdev->id);
 863 +               err = -ENOMEM;
 864 +               goto err_out;
 865 +       }
 866 +
 867 +       dev = alloc_etherdev_mq(sizeof(struct ltq_etop_priv), 4);
 868 +       strcpy(dev->name, "eth%d");
 869 +       dev->netdev_ops = &ltq_eth_netdev_ops;
 870 +       dev->ethtool_ops = &ltq_etop_ethtool_ops;
 871 +       priv = netdev_priv(dev);
 872 +       priv->res = res;
 873 +       priv->pldata = dev_get_platdata(&pdev->dev);
 874 +       priv->netdev = dev;
 875 +       spin_lock_init(&priv->lock);
 876 +
 877 +       for (i = 0; i < MAX_DMA_CHAN; i++) {
 878 +               if (IS_TX(i))
 879 +                       netif_napi_add(dev, &priv->ch[i].napi,
 880 +                               ltq_etop_poll_tx, 8);
 881 +               else if (IS_RX(i))
 882 +                       netif_napi_add(dev, &priv->ch[i].napi,
 883 +                               ltq_etop_poll_rx, 32);
 884 +               priv->ch[i].netdev = dev;
 885 +       }
 886 +
 887 +       err = register_netdev(dev);
 888 +       if (err)
 889 +               goto err_free;
 890 +
 891 +       platform_set_drvdata(pdev, dev);
 892 +       return 0;
 893 +
 894 +err_free:
 895 +       kfree(dev);
 896 +err_out:
 897 +       return err;
 898 +}
 899 +
 900 +static int __devexit
 901 +ltq_etop_remove(struct platform_device *pdev)
 902 +{
 903 +       struct net_device *dev = platform_get_drvdata(pdev);
 904 +
 905 +       if (dev) {
 906 +               netif_tx_stop_all_queues(dev);
 907 +               ltq_etop_hw_exit(dev);
 908 +               ltq_etop_mdio_cleanup(dev);
 909 +               unregister_netdev(dev);
 910 +       }
 911 +       return 0;
 912 +}
 913 +
 914 +static struct platform_driver ltq_mii_driver = {
 915 +       .remove = __devexit_p(ltq_etop_remove),
 916 +       .driver = {
 917 +               .name = "ltq_etop",
 918 +               .owner = THIS_MODULE,
 919 +       },
 920 +};
 921 +
 922 +int __init
 923 +init_ltq_etop(void)
 924 +{
 925 +       int ret = platform_driver_probe(&ltq_mii_driver, ltq_etop_probe);
 926 +
 927 +       if (ret)
 928 +               pr_err("ltq_etop: Error registering platfom driver!");
 929 +       return ret;
 930 +}
 931 +
 932 +static void __exit
 933 +exit_ltq_etop(void)
 934 +{
 935 +       platform_driver_unregister(&ltq_mii_driver);
 936 +}
 937 +
 938 +module_init(init_ltq_etop);
 939 +module_exit(exit_ltq_etop);
 940 +
 941 +MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
 942 +MODULE_DESCRIPTION("Lantiq SoC ETOP");
 943 +MODULE_LICENSE("GPL");