drivers/net/stmmac/stmmac_main.c

   1 /*******************************************************************************
   2   This is the driver for the ST MAC 10/100/1000 on-chip Ethernet controllers.
   3   ST Ethernet IPs are built around a Synopsys IP Core.
   4
   5   Copyright (C) 2007-2009  STMicroelectronics Ltd
   6
   7   This program is free software; you can redistribute it and/or modify it
   8   under the terms and conditions of the GNU General Public License,
   9   version 2, as published by the Free Software Foundation.
  10
  11   This program is distributed in the hope it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc.,
  18   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  19
  20   The full GNU General Public License is included in this distribution in
  21   the file called "COPYING".
  22
  23   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  24
  25   Documentation available at:
  26         http://www.stlinux.com
  27   Support available at:
  28         https://bugzilla.stlinux.com/
  29 *******************************************************************************/
  30
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/platform_device.h>
  37 #include <linux/ip.h>
  38 #include <linux/tcp.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/ethtool.h>
  41 #include <linux/if_ether.h>
  42 #include <linux/crc32.h>
  43 #include <linux/mii.h>
  44 #include <linux/phy.h>
  45 #include <linux/if_vlan.h>
  46 #include <linux/dma-mapping.h>
  47 #include <linux/slab.h>
  48 #include <linux/prefetch.h>
  49 #include "stmmac.h"
  50
  51 #define STMMAC_RESOURCE_NAME    "stmmaceth"
  52 #define PHY_RESOURCE_NAME       "stmmacphy"
  53
  54 #undef STMMAC_DEBUG
  55 /*#define STMMAC_DEBUG*/
  56 #ifdef STMMAC_DEBUG
  57 #define DBG(nlevel, klevel, fmt, args...) \
  58                 ((void)(netif_msg_##nlevel(priv) && \
  59                 printk(KERN_##klevel fmt, ## args)))
  60 #else
  61 #define DBG(nlevel, klevel, fmt, args...) do { } while (0)
  62 #endif
  63
  64 #undef STMMAC_RX_DEBUG
  65 /*#define STMMAC_RX_DEBUG*/
  66 #ifdef STMMAC_RX_DEBUG
  67 #define RX_DBG(fmt, args...)  printk(fmt, ## args)
  68 #else
  69 #define RX_DBG(fmt, args...)  do { } while (0)
  70 #endif
  71
  72 #undef STMMAC_XMIT_DEBUG
  73 /*#define STMMAC_XMIT_DEBUG*/
  74 #ifdef STMMAC_TX_DEBUG
  75 #define TX_DBG(fmt, args...)  printk(fmt, ## args)
  76 #else
  77 #define TX_DBG(fmt, args...)  do { } while (0)
  78 #endif
  79
  80 #define STMMAC_ALIGN(x) L1_CACHE_ALIGN(x)
  81 #define JUMBO_LEN       9000
  82
  83 /* Module parameters */
  84 #define TX_TIMEO 5000 /* default 5 seconds */
  85 static int watchdog = TX_TIMEO;
  86 module_param(watchdog, int, S_IRUGO | S_IWUSR);
  87 MODULE_PARM_DESC(watchdog, "Transmit timeout in milliseconds");
  88
  89 static int debug = -1;          /* -1: default, 0: no output, 16:  all */
  90 module_param(debug, int, S_IRUGO | S_IWUSR);
  91 MODULE_PARM_DESC(debug, "Message Level (0: no output, 16: all)");
  92
  93 static int phyaddr = -1;
  94 module_param(phyaddr, int, S_IRUGO);
  95 MODULE_PARM_DESC(phyaddr, "Physical device address");
  96
  97 #define DMA_TX_SIZE 256
  98 static int dma_txsize = DMA_TX_SIZE;
  99 module_param(dma_txsize, int, S_IRUGO | S_IWUSR);
 100 MODULE_PARM_DESC(dma_txsize, "Number of descriptors in the TX list");
 101
 102 #define DMA_RX_SIZE 256
 103 static int dma_rxsize = DMA_RX_SIZE;
 104 module_param(dma_rxsize, int, S_IRUGO | S_IWUSR);
 105 MODULE_PARM_DESC(dma_rxsize, "Number of descriptors in the RX list");
 106
 107 static int flow_ctrl = FLOW_OFF;
 108 module_param(flow_ctrl, int, S_IRUGO | S_IWUSR);
 109 MODULE_PARM_DESC(flow_ctrl, "Flow control ability [on/off]");
 110
 111 static int pause = PAUSE_TIME;
 112 module_param(pause, int, S_IRUGO | S_IWUSR);
 113 MODULE_PARM_DESC(pause, "Flow Control Pause Time");
 114
 115 #define TC_DEFAULT 64
 116 static int tc = TC_DEFAULT;
 117 module_param(tc, int, S_IRUGO | S_IWUSR);
 118 MODULE_PARM_DESC(tc, "DMA threshold control value");
 119
 120 /* Pay attention to tune this parameter; take care of both
 121  * hardware capability and network stabitily/performance impact.
 122  * Many tests showed that ~4ms latency seems to be good enough. */
 123 #ifdef CONFIG_STMMAC_TIMER
 124 #define DEFAULT_PERIODIC_RATE   256
 125 static int tmrate = DEFAULT_PERIODIC_RATE;
 126 module_param(tmrate, int, S_IRUGO | S_IWUSR);
 127 MODULE_PARM_DESC(tmrate, "External timer freq. (default: 256Hz)");
 128 #endif
 129
 130 #define DMA_BUFFER_SIZE BUF_SIZE_2KiB
 131 static int buf_sz = DMA_BUFFER_SIZE;
 132 module_param(buf_sz, int, S_IRUGO | S_IWUSR);
 133 MODULE_PARM_DESC(buf_sz, "DMA buffer size");
 134
 135 static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
 136                                       NETIF_MSG_LINK | NETIF_MSG_IFUP |
 137                                       NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);
 138
 139 static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
 140
 141 /**
 142  * stmmac_verify_args - verify the driver parameters.
 143  * Description: it verifies if some wrong parameter is passed to the driver.
 144  * Note that wrong parameters are replaced with the default values.
 145  */
 146 static void stmmac_verify_args(void)
 147 {
 148         if (unlikely(watchdog < 0))
 149                 watchdog = TX_TIMEO;
 150         if (unlikely(dma_rxsize < 0))
 151                 dma_rxsize = DMA_RX_SIZE;
 152         if (unlikely(dma_txsize < 0))
 153                 dma_txsize = DMA_TX_SIZE;
 154         if (unlikely((buf_sz < DMA_BUFFER_SIZE) || (buf_sz > BUF_SIZE_16KiB)))
 155                 buf_sz = DMA_BUFFER_SIZE;
 156         if (unlikely(flow_ctrl > 1))
 157                 flow_ctrl = FLOW_AUTO;
 158         else if (likely(flow_ctrl < 0))
 159                 flow_ctrl = FLOW_OFF;
 160         if (unlikely((pause < 0) || (pause > 0xffff)))
 161                 pause = PAUSE_TIME;
 162 }
 163
 164 #if defined(STMMAC_XMIT_DEBUG) || defined(STMMAC_RX_DEBUG)
 165 static void print_pkt(unsigned char *buf, int len)
 166 {
 167         int j;
 168         pr_info("len = %d byte, buf addr: 0x%p", len, buf);
 169         for (j = 0; j < len; j++) {
 170                 if ((j % 16) == 0)
 171                         pr_info("\n %03x:", j);
 172                 pr_info(" %02x", buf[j]);
 173         }
 174         pr_info("\n");
 175 }
 176 #endif
 177
 178 /* minimum number of free TX descriptors required to wake up TX process */
 179 #define STMMAC_TX_THRESH(x)     (x->dma_tx_size/4)
 180
 181 static inline u32 stmmac_tx_avail(struct stmmac_priv *priv)
 182 {
 183         return priv->dirty_tx + priv->dma_tx_size - priv->cur_tx - 1;
 184 }
 185
 186 /* On some ST platforms, some HW system configuraton registers have to be
 187  * set according to the link speed negotiated.
 188  */
 189 static inline void stmmac_hw_fix_mac_speed(struct stmmac_priv *priv)
 190 {
 191         struct phy_device *phydev = priv->phydev;
 192
 193         if (likely(priv->plat->fix_mac_speed))
 194                 priv->plat->fix_mac_speed(priv->plat->bsp_priv,
 195                                           phydev->speed);
 196 }
 197
 198 /**
 199  * stmmac_adjust_link
 200  * @dev: net device structure
 201  * Description: it adjusts the link parameters.
 202  */
 203 static void stmmac_adjust_link(struct net_device *dev)
 204 {
 205         struct stmmac_priv *priv = netdev_priv(dev);
 206         struct phy_device *phydev = priv->phydev;
 207         unsigned long flags;
 208         int new_state = 0;
 209         unsigned int fc = priv->flow_ctrl, pause_time = priv->pause;
 210
 211         if (phydev == NULL)
 212                 return;
 213
 214         DBG(probe, DEBUG, "stmmac_adjust_link: called.  address %d link %d\n",
 215             phydev->addr, phydev->link);
 216
 217         spin_lock_irqsave(&priv->lock, flags);
 218         if (phydev->link) {
 219                 u32 ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
 220
 221                 /* Now we make sure that we can be in full duplex mode.
 222                  * If not, we operate in half-duplex mode. */
 223                 if (phydev->duplex != priv->oldduplex) {
 224                         new_state = 1;
 225                         if (!(phydev->duplex))
 226                                 ctrl &= ~priv->hw->link.duplex;
 227                         else
 228                                 ctrl |= priv->hw->link.duplex;
 229                         priv->oldduplex = phydev->duplex;
 230                 }
 231                 /* Flow Control operation */
 232                 if (phydev->pause)
 233                         priv->hw->mac->flow_ctrl(priv->ioaddr, phydev->duplex,
 234                                                  fc, pause_time);
 235
 236                 if (phydev->speed != priv->speed) {
 237                         new_state = 1;
 238                         switch (phydev->speed) {
 239                         case 1000:
 240                                 if (likely(priv->plat->has_gmac))
 241                                         ctrl &= ~priv->hw->link.port;
 242                                 stmmac_hw_fix_mac_speed(priv);
 243                                 break;
 244                         case 100:
 245                         case 10:
 246                                 if (priv->plat->has_gmac) {
 247                                         ctrl |= priv->hw->link.port;
 248                                         if (phydev->speed == SPEED_100) {
 249                                                 ctrl |= priv->hw->link.speed;
 250                                         } else {
 251                                                 ctrl &= ~(priv->hw->link.speed);
 252                                         }
 253                                 } else {
 254                                         ctrl &= ~priv->hw->link.port;
 255                                 }
 256                                 stmmac_hw_fix_mac_speed(priv);
 257                                 break;
 258                         default:
 259                                 if (netif_msg_link(priv))
 260                                         pr_warning("%s: Speed (%d) is not 10"
 261                                        " or 100!\n", dev->name, phydev->speed);
 262                                 break;
 263                         }
 264
 265                         priv->speed = phydev->speed;
 266                 }
 267
 268                 writel(ctrl, priv->ioaddr + MAC_CTRL_REG);
 269
 270                 if (!priv->oldlink) {
 271                         new_state = 1;
 272                         priv->oldlink = 1;
 273                 }
 274         } else if (priv->oldlink) {
 275                 new_state = 1;
 276                 priv->oldlink = 0;
 277                 priv->speed = 0;
 278                 priv->oldduplex = -1;
 279         }
 280
 281         if (new_state && netif_msg_link(priv))
 282                 phy_print_status(phydev);
 283
 284         spin_unlock_irqrestore(&priv->lock, flags);
 285
 286         DBG(probe, DEBUG, "stmmac_adjust_link: exiting\n");
 287 }
 288
 289 /**
 290  * stmmac_init_phy - PHY initialization
 291  * @dev: net device structure
 292  * Description: it initializes the driver's PHY state, and attaches the PHY
 293  * to the mac driver.
 294  *  Return value:
 295  *  0 on success
 296  */
 297 static int stmmac_init_phy(struct net_device *dev)
 298 {
 299         struct stmmac_priv *priv = netdev_priv(dev);
 300         struct phy_device *phydev;
 301         char phy_id[MII_BUS_ID_SIZE + 3];
 302         char bus_id[MII_BUS_ID_SIZE];
 303
 304         priv->oldlink = 0;
 305         priv->speed = 0;
 306         priv->oldduplex = -1;
 307
 308         if (priv->phy_addr == -1) {
 309                 /* We don't have a PHY, so do nothing */
 310                 return 0;
 311         }
 312
 313         snprintf(bus_id, MII_BUS_ID_SIZE, "%x", priv->plat->bus_id);
 314         snprintf(phy_id, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
 315                  priv->phy_addr);
 316         pr_debug("stmmac_init_phy:  trying to attach to %s\n", phy_id);
 317
 318         phydev = phy_connect(dev, phy_id, &stmmac_adjust_link, 0,
 319                         priv->phy_interface);
 320
 321         if (IS_ERR(phydev)) {
 322                 pr_err("%s: Could not attach to PHY\n", dev->name);
 323                 return PTR_ERR(phydev);
 324         }
 325
 326         /*
 327          * Broken HW is sometimes missing the pull-up resistor on the
 328          * MDIO line, which results in reads to non-existent devices returning
 329          * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
 330          * device as well.
 331          * Note: phydev->phy_id is the result of reading the UID PHY registers.
 332          */
 333         if (phydev->phy_id == 0) {
 334                 phy_disconnect(phydev);
 335                 return -ENODEV;
 336         }
 337         pr_debug("stmmac_init_phy:  %s: attached to PHY (UID 0x%x)"
 338                " Link = %d\n", dev->name, phydev->phy_id, phydev->link);
 339
 340         priv->phydev = phydev;
 341
 342         return 0;
 343 }
 344
 345 static inline void stmmac_enable_mac(void __iomem *ioaddr)
 346 {
 347         u32 value = readl(ioaddr + MAC_CTRL_REG);
 348
 349         value |= MAC_RNABLE_RX | MAC_ENABLE_TX;
 350         writel(value, ioaddr + MAC_CTRL_REG);
 351 }
 352
 353 static inline void stmmac_disable_mac(void __iomem *ioaddr)
 354 {
 355         u32 value = readl(ioaddr + MAC_CTRL_REG);
 356
 357         value &= ~(MAC_ENABLE_TX | MAC_RNABLE_RX);
 358         writel(value, ioaddr + MAC_CTRL_REG);
 359 }
 360
 361 /**
 362  * display_ring
 363  * @p: pointer to the ring.
 364  * @size: size of the ring.
 365  * Description: display all the descriptors within the ring.
 366  */
 367 static void display_ring(struct dma_desc *p, int size)
 368 {
 369         struct tmp_s {
 370                 u64 a;
 371                 unsigned int b;
 372                 unsigned int c;
 373         };
 374         int i;
 375         for (i = 0; i < size; i++) {
 376                 struct tmp_s *x = (struct tmp_s *)(p + i);
 377                 pr_info("\t%d [0x%x]: DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
 378                        i, (unsigned int)virt_to_phys(&p[i]),
 379                        (unsigned int)(x->a), (unsigned int)((x->a) >> 32),
 380                        x->b, x->c);
 381                 pr_info("\n");
 382         }
 383 }
 384
 385 /**
 386  * init_dma_desc_rings - init the RX/TX descriptor rings
 387  * @dev: net device structure
 388  * Description:  this function initializes the DMA RX/TX descriptors
 389  * and allocates the socket buffers.
 390  */
 391 static void init_dma_desc_rings(struct net_device *dev)
 392 {
 393         int i;
 394         struct stmmac_priv *priv = netdev_priv(dev);
 395         struct sk_buff *skb;
 396         unsigned int txsize = priv->dma_tx_size;
 397         unsigned int rxsize = priv->dma_rx_size;
 398         unsigned int bfsize = priv->dma_buf_sz;
 399         int buff2_needed = 0, dis_ic = 0;
 400
 401         /* Set the Buffer size according to the MTU;
 402          * indeed, in case of jumbo we need to bump-up the buffer sizes.
 403          */
 404         if (unlikely(dev->mtu >= BUF_SIZE_8KiB))
 405                 bfsize = BUF_SIZE_16KiB;
 406         else if (unlikely(dev->mtu >= BUF_SIZE_4KiB))
 407                 bfsize = BUF_SIZE_8KiB;
 408         else if (unlikely(dev->mtu >= BUF_SIZE_2KiB))
 409                 bfsize = BUF_SIZE_4KiB;
 410         else if (unlikely(dev->mtu >= DMA_BUFFER_SIZE))
 411                 bfsize = BUF_SIZE_2KiB;
 412         else
 413                 bfsize = DMA_BUFFER_SIZE;
 414
 415 #ifdef CONFIG_STMMAC_TIMER
 416         /* Disable interrupts on completion for the reception if timer is on */
 417         if (likely(priv->tm->enable))
 418                 dis_ic = 1;
 419 #endif
 420         /* If the MTU exceeds 8k so use the second buffer in the chain */
 421         if (bfsize >= BUF_SIZE_8KiB)
 422                 buff2_needed = 1;
 423
 424         DBG(probe, INFO, "stmmac: txsize %d, rxsize %d, bfsize %d\n",
 425             txsize, rxsize, bfsize);
 426
 427         priv->rx_skbuff_dma = kmalloc(rxsize * sizeof(dma_addr_t), GFP_KERNEL);
 428         priv->rx_skbuff =
 429             kmalloc(sizeof(struct sk_buff *) * rxsize, GFP_KERNEL);
 430         priv->dma_rx =
 431             (struct dma_desc *)dma_alloc_coherent(priv->device,
 432                                                   rxsize *
 433                                                   sizeof(struct dma_desc),
 434                                                   &priv->dma_rx_phy,
 435                                                   GFP_KERNEL);
 436         priv->tx_skbuff = kmalloc(sizeof(struct sk_buff *) * txsize,
 437                                        GFP_KERNEL);
 438         priv->dma_tx =
 439             (struct dma_desc *)dma_alloc_coherent(priv->device,
 440                                                   txsize *
 441                                                   sizeof(struct dma_desc),
 442                                                   &priv->dma_tx_phy,
 443                                                   GFP_KERNEL);
 444
 445         if ((priv->dma_rx == NULL) || (priv->dma_tx == NULL)) {
 446                 pr_err("%s:ERROR allocating the DMA Tx/Rx desc\n", __func__);
 447                 return;
 448         }
 449
 450         DBG(probe, INFO, "stmmac (%s) DMA desc rings: virt addr (Rx %p, "
 451             "Tx %p)\n\tDMA phy addr (Rx 0x%08x, Tx 0x%08x)\n",
 452             dev->name, priv->dma_rx, priv->dma_tx,
 453             (unsigned int)priv->dma_rx_phy, (unsigned int)priv->dma_tx_phy);
 454
 455         /* RX INITIALIZATION */
 456         DBG(probe, INFO, "stmmac: SKB addresses:\n"
 457                          "skb\t\tskb data\tdma data\n");
 458
 459         for (i = 0; i < rxsize; i++) {
 460                 struct dma_desc *p = priv->dma_rx + i;
 461
 462                 skb = netdev_alloc_skb_ip_align(dev, bfsize);
 463                 if (unlikely(skb == NULL)) {
 464                         pr_err("%s: Rx init fails; skb is NULL\n", __func__);
 465                         break;
 466                 }
 467                 priv->rx_skbuff[i] = skb;
 468                 priv->rx_skbuff_dma[i] = dma_map_single(priv->device, skb->data,
 469                                                 bfsize, DMA_FROM_DEVICE);
 470
 471                 p->des2 = priv->rx_skbuff_dma[i];
 472                 if (unlikely(buff2_needed))
 473                         p->des3 = p->des2 + BUF_SIZE_8KiB;
 474                 DBG(probe, INFO, "[%p]\t[%p]\t[%x]\n", priv->rx_skbuff[i],
 475                         priv->rx_skbuff[i]->data, priv->rx_skbuff_dma[i]);
 476         }
 477         priv->cur_rx = 0;
 478         priv->dirty_rx = (unsigned int)(i - rxsize);
 479         priv->dma_buf_sz = bfsize;
 480         buf_sz = bfsize;
 481
 482         /* TX INITIALIZATION */
 483         for (i = 0; i < txsize; i++) {
 484                 priv->tx_skbuff[i] = NULL;
 485                 priv->dma_tx[i].des2 = 0;
 486         }
 487         priv->dirty_tx = 0;
 488         priv->cur_tx = 0;
 489
 490         /* Clear the Rx/Tx descriptors */
 491         priv->hw->desc->init_rx_desc(priv->dma_rx, rxsize, dis_ic);
 492         priv->hw->desc->init_tx_desc(priv->dma_tx, txsize);
 493
 494         if (netif_msg_hw(priv)) {
 495                 pr_info("RX descriptor ring:\n");
 496                 display_ring(priv->dma_rx, rxsize);
 497                 pr_info("TX descriptor ring:\n");
 498                 display_ring(priv->dma_tx, txsize);
 499         }
 500 }
 501
 502 static void dma_free_rx_skbufs(struct stmmac_priv *priv)
 503 {
 504         int i;
 505
 506         for (i = 0; i < priv->dma_rx_size; i++) {
 507                 if (priv->rx_skbuff[i]) {
 508                         dma_unmap_single(priv->device, priv->rx_skbuff_dma[i],
 509                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
 510                         dev_kfree_skb_any(priv->rx_skbuff[i]);
 511                 }
 512                 priv->rx_skbuff[i] = NULL;
 513         }
 514 }
 515
 516 static void dma_free_tx_skbufs(struct stmmac_priv *priv)
 517 {
 518         int i;
 519
 520         for (i = 0; i < priv->dma_tx_size; i++) {
 521                 if (priv->tx_skbuff[i] != NULL) {
 522                         struct dma_desc *p = priv->dma_tx + i;
 523                         if (p->des2)
 524                                 dma_unmap_single(priv->device, p->des2,
 525                                                  priv->hw->desc->get_tx_len(p),
 526                                                  DMA_TO_DEVICE);
 527                         dev_kfree_skb_any(priv->tx_skbuff[i]);
 528                         priv->tx_skbuff[i] = NULL;
 529                 }
 530         }
 531 }
 532
 533 static void free_dma_desc_resources(struct stmmac_priv *priv)
 534 {
 535         /* Release the DMA TX/RX socket buffers */
 536         dma_free_rx_skbufs(priv);
 537         dma_free_tx_skbufs(priv);
 538
 539         /* Free the region of consistent memory previously allocated for
 540          * the DMA */
 541         dma_free_coherent(priv->device,
 542                           priv->dma_tx_size * sizeof(struct dma_desc),
 543                           priv->dma_tx, priv->dma_tx_phy);
 544         dma_free_coherent(priv->device,
 545                           priv->dma_rx_size * sizeof(struct dma_desc),
 546                           priv->dma_rx, priv->dma_rx_phy);
 547         kfree(priv->rx_skbuff_dma);
 548         kfree(priv->rx_skbuff);
 549         kfree(priv->tx_skbuff);
 550 }
 551
 552 /**
 553  *  stmmac_dma_operation_mode - HW DMA operation mode
 554  *  @priv : pointer to the private device structure.
 555  *  Description: it sets the DMA operation mode: tx/rx DMA thresholds
 556  *  or Store-And-Forward capability.
 557  */
 558 static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 559 {
 560         if (likely(priv->plat->force_sf_dma_mode ||
 561                 ((priv->plat->tx_coe) && (!priv->no_csum_insertion)))) {
 562                 /*
 563                  * In case of GMAC, SF mode can be enabled
 564                  * to perform the TX COE in HW. This depends on:
 565                  * 1) TX COE if actually supported
 566                  * 2) There is no bugged Jumbo frame support
 567                  *    that needs to not insert csum in the TDES.
 568                  */
 569                 priv->hw->dma->dma_mode(priv->ioaddr,
 570                                         SF_DMA_MODE, SF_DMA_MODE);
 571                 tc = SF_DMA_MODE;
 572         } else
 573                 priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 574 }
 575
 576 /**
 577  * stmmac_tx:
 578  * @priv: private driver structure
 579  * Description: it reclaims resources after transmission completes.
 580  */
 581 static void stmmac_tx(struct stmmac_priv *priv)
 582 {
 583         unsigned int txsize = priv->dma_tx_size;
 584
 585         while (priv->dirty_tx != priv->cur_tx) {
 586                 int last;
 587                 unsigned int entry = priv->dirty_tx % txsize;
 588                 struct sk_buff *skb = priv->tx_skbuff[entry];
 589                 struct dma_desc *p = priv->dma_tx + entry;
 590
 591                 /* Check if the descriptor is owned by the DMA. */
 592                 if (priv->hw->desc->get_tx_owner(p))
 593                         break;
 594
 595                 /* Verify tx error by looking at the last segment */
 596                 last = priv->hw->desc->get_tx_ls(p);
 597                 if (likely(last)) {
 598                         int tx_error =
 599                                 priv->hw->desc->tx_status(&priv->dev->stats,
 600                                                           &priv->xstats, p,
 601                                                           priv->ioaddr);
 602                         if (likely(tx_error == 0)) {
 603                                 priv->dev->stats.tx_packets++;
 604                                 priv->xstats.tx_pkt_n++;
 605                         } else
 606                                 priv->dev->stats.tx_errors++;
 607                 }
 608                 TX_DBG("%s: curr %d, dirty %d\n", __func__,
 609                         priv->cur_tx, priv->dirty_tx);
 610
 611                 if (likely(p->des2))
 612                         dma_unmap_single(priv->device, p->des2,
 613                                          priv->hw->desc->get_tx_len(p),
 614                                          DMA_TO_DEVICE);
 615                 if (unlikely(p->des3))
 616                         p->des3 = 0;
 617
 618                 if (likely(skb != NULL)) {
 619                         /*
 620                          * If there's room in the queue (limit it to size)
 621                          * we add this skb back into the pool,
 622                          * if it's the right size.
 623                          */
 624                         if ((skb_queue_len(&priv->rx_recycle) <
 625                                 priv->dma_rx_size) &&
 626                                 skb_recycle_check(skb, priv->dma_buf_sz))
 627                                 __skb_queue_head(&priv->rx_recycle, skb);
 628                         else
 629                                 dev_kfree_skb(skb);
 630
 631                         priv->tx_skbuff[entry] = NULL;
 632                 }
 633
 634                 priv->hw->desc->release_tx_desc(p);
 635
 636                 entry = (++priv->dirty_tx) % txsize;
 637         }
 638         if (unlikely(netif_queue_stopped(priv->dev) &&
 639                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv))) {
 640                 netif_tx_lock(priv->dev);
 641                 if (netif_queue_stopped(priv->dev) &&
 642                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv)) {
 643                         TX_DBG("%s: restart transmit\n", __func__);
 644                         netif_wake_queue(priv->dev);
 645                 }
 646                 netif_tx_unlock(priv->dev);
 647         }
 648 }
 649
 650 static inline void stmmac_enable_irq(struct stmmac_priv *priv)
 651 {
 652 #ifdef CONFIG_STMMAC_TIMER
 653         if (likely(priv->tm->enable))
 654                 priv->tm->timer_start(tmrate);
 655         else
 656 #endif
 657                 priv->hw->dma->enable_dma_irq(priv->ioaddr);
 658 }
 659
 660 static inline void stmmac_disable_irq(struct stmmac_priv *priv)
 661 {
 662 #ifdef CONFIG_STMMAC_TIMER
 663         if (likely(priv->tm->enable))
 664                 priv->tm->timer_stop();
 665         else
 666 #endif
 667                 priv->hw->dma->disable_dma_irq(priv->ioaddr);
 668 }
 669
 670 static int stmmac_has_work(struct stmmac_priv *priv)
 671 {
 672         unsigned int has_work = 0;
 673         int rxret, tx_work = 0;
 674
 675         rxret = priv->hw->desc->get_rx_owner(priv->dma_rx +
 676                 (priv->cur_rx % priv->dma_rx_size));
 677
 678         if (priv->dirty_tx != priv->cur_tx)
 679                 tx_work = 1;
 680
 681         if (likely(!rxret || tx_work))
 682                 has_work = 1;
 683
 684         return has_work;
 685 }
 686
 687 static inline void _stmmac_schedule(struct stmmac_priv *priv)
 688 {
 689         if (likely(stmmac_has_work(priv))) {
 690                 stmmac_disable_irq(priv);
 691                 napi_schedule(&priv->napi);
 692         }
 693 }
 694
 695 #ifdef CONFIG_STMMAC_TIMER
 696 void stmmac_schedule(struct net_device *dev)
 697 {
 698         struct stmmac_priv *priv = netdev_priv(dev);
 699
 700         priv->xstats.sched_timer_n++;
 701
 702         _stmmac_schedule(priv);
 703 }
 704
 705 static void stmmac_no_timer_started(unsigned int x)
 706 {;
 707 };
 708
 709 static void stmmac_no_timer_stopped(void)
 710 {;
 711 };
 712 #endif
 713
 714 /**
 715  * stmmac_tx_err:
 716  * @priv: pointer to the private device structure
 717  * Description: it cleans the descriptors and restarts the transmission
 718  * in case of errors.
 719  */
 720 static void stmmac_tx_err(struct stmmac_priv *priv)
 721 {
 722
 723         netif_stop_queue(priv->dev);
 724
 725         priv->hw->dma->stop_tx(priv->ioaddr);
 726         dma_free_tx_skbufs(priv);
 727         priv->hw->desc->init_tx_desc(priv->dma_tx, priv->dma_tx_size);
 728         priv->dirty_tx = 0;
 729         priv->cur_tx = 0;
 730         priv->hw->dma->start_tx(priv->ioaddr);
 731
 732         priv->dev->stats.tx_errors++;
 733         netif_wake_queue(priv->dev);
 734 }
 735
 736
 737 static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 738 {
 739         int status;
 740
 741         status = priv->hw->dma->dma_interrupt(priv->ioaddr, &priv->xstats);
 742         if (likely(status == handle_tx_rx))
 743                 _stmmac_schedule(priv);
 744
 745         else if (unlikely(status == tx_hard_error_bump_tc)) {
 746                 /* Try to bump up the dma threshold on this failure */
 747                 if (unlikely(tc != SF_DMA_MODE) && (tc <= 256)) {
 748                         tc += 64;
 749                         priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 750                         priv->xstats.threshold = tc;
 751                 }
 752         } else if (unlikely(status == tx_hard_error))
 753                 stmmac_tx_err(priv);
 754 }
 755
 756 /**
 757  *  stmmac_open - open entry point of the driver
 758  *  @dev : pointer to the device structure.
 759  *  Description:
 760  *  This function is the open entry point of the driver.
 761  *  Return value:
 762  *  0 on success and an appropriate (-)ve integer as defined in errno.h
 763  *  file on failure.
 764  */
 765 static int stmmac_open(struct net_device *dev)
 766 {
 767         struct stmmac_priv *priv = netdev_priv(dev);
 768         int ret;
 769
 770         /* Check that the MAC address is valid.  If its not, refuse
 771          * to bring the device up. The user must specify an
 772          * address using the following linux command:
 773          *      ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx  */
 774         if (!is_valid_ether_addr(dev->dev_addr)) {
 775                 random_ether_addr(dev->dev_addr);
 776                 pr_warning("%s: generated random MAC address %pM\n", dev->name,
 777                         dev->dev_addr);
 778         }
 779
 780         stmmac_verify_args();
 781
 782 #ifdef CONFIG_STMMAC_TIMER
 783         priv->tm = kzalloc(sizeof(struct stmmac_timer *), GFP_KERNEL);
 784         if (unlikely(priv->tm == NULL)) {
 785                 pr_err("%s: ERROR: timer memory alloc failed\n", __func__);
 786                 return -ENOMEM;
 787         }
 788         priv->tm->freq = tmrate;
 789
 790         /* Test if the external timer can be actually used.
 791          * In case of failure continue without timer. */
 792         if (unlikely((stmmac_open_ext_timer(dev, priv->tm)) < 0)) {
 793                 pr_warning("stmmaceth: cannot attach the external timer.\n");
 794                 priv->tm->freq = 0;
 795                 priv->tm->timer_start = stmmac_no_timer_started;
 796                 priv->tm->timer_stop = stmmac_no_timer_stopped;
 797         } else
 798                 priv->tm->enable = 1;
 799 #endif
 800         ret = stmmac_init_phy(dev);
 801         if (unlikely(ret)) {
 802                 pr_err("%s: Cannot attach to PHY (error: %d)\n", __func__, ret);
 803                 goto open_error;
 804         }
 805
 806         /* Create and initialize the TX/RX descriptors chains. */
 807         priv->dma_tx_size = STMMAC_ALIGN(dma_txsize);
 808         priv->dma_rx_size = STMMAC_ALIGN(dma_rxsize);
 809         priv->dma_buf_sz = STMMAC_ALIGN(buf_sz);
 810         init_dma_desc_rings(dev);
 811
 812         /* DMA initialization and SW reset */
 813         ret = priv->hw->dma->init(priv->ioaddr, priv->plat->pbl,
 814                                   priv->dma_tx_phy, priv->dma_rx_phy);
 815         if (ret < 0) {
 816                 pr_err("%s: DMA initialization failed\n", __func__);
 817                 goto open_error;
 818         }
 819
 820         /* Copy the MAC addr into the HW  */
 821         priv->hw->mac->set_umac_addr(priv->ioaddr, dev->dev_addr, 0);
 822         /* If required, perform hw setup of the bus. */
 823         if (priv->plat->bus_setup)
 824                 priv->plat->bus_setup(priv->ioaddr);
 825         /* Initialize the MAC Core */
 826         priv->hw->mac->core_init(priv->ioaddr);
 827
 828         priv->rx_coe = priv->hw->mac->rx_coe(priv->ioaddr);
 829         if (priv->rx_coe)
 830                 pr_info("stmmac: Rx Checksum Offload Engine supported\n");
 831         if (priv->plat->tx_coe)
 832                 pr_info("\tTX Checksum insertion supported\n");
 833         netdev_update_features(dev);
 834
 835         /* Initialise the MMC (if present) to disable all interrupts. */
 836         writel(0xffffffff, priv->ioaddr + MMC_HIGH_INTR_MASK);
 837         writel(0xffffffff, priv->ioaddr + MMC_LOW_INTR_MASK);
 838
 839         /* Request the IRQ lines */
 840         ret = request_irq(dev->irq, stmmac_interrupt,
 841                          IRQF_SHARED, dev->name, dev);
 842         if (unlikely(ret < 0)) {
 843                 pr_err("%s: ERROR: allocating the IRQ %d (error: %d)\n",
 844                        __func__, dev->irq, ret);
 845                 goto open_error;
 846         }
 847
 848         /* Enable the MAC Rx/Tx */
 849         stmmac_enable_mac(priv->ioaddr);
 850
 851         /* Set the HW DMA mode and the COE */
 852         stmmac_dma_operation_mode(priv);
 853
 854         /* Extra statistics */
 855         memset(&priv->xstats, 0, sizeof(struct stmmac_extra_stats));
 856         priv->xstats.threshold = tc;
 857
 858         /* Start the ball rolling... */
 859         DBG(probe, DEBUG, "%s: DMA RX/TX processes started...\n", dev->name);
 860         priv->hw->dma->start_tx(priv->ioaddr);
 861         priv->hw->dma->start_rx(priv->ioaddr);
 862
 863 #ifdef CONFIG_STMMAC_TIMER
 864         priv->tm->timer_start(tmrate);
 865 #endif
 866         /* Dump DMA/MAC registers */
 867         if (netif_msg_hw(priv)) {
 868                 priv->hw->mac->dump_regs(priv->ioaddr);
 869                 priv->hw->dma->dump_regs(priv->ioaddr);
 870         }
 871
 872         if (priv->phydev)
 873                 phy_start(priv->phydev);
 874
 875         napi_enable(&priv->napi);
 876         skb_queue_head_init(&priv->rx_recycle);
 877         netif_start_queue(dev);
 878
 879         return 0;
 880
 881 open_error:
 882 #ifdef CONFIG_STMMAC_TIMER
 883         kfree(priv->tm);
 884 #endif
 885         if (priv->phydev)
 886                 phy_disconnect(priv->phydev);
 887
 888         return ret;
 889 }
 890
 891 /**
 892  *  stmmac_release - close entry point of the driver
 893  *  @dev : device pointer.
 894  *  Description:
 895  *  This is the stop entry point of the driver.
 896  */
 897 static int stmmac_release(struct net_device *dev)
 898 {
 899         struct stmmac_priv *priv = netdev_priv(dev);
 900
 901         /* Stop and disconnect the PHY */
 902         if (priv->phydev) {
 903                 phy_stop(priv->phydev);
 904                 phy_disconnect(priv->phydev);
 905                 priv->phydev = NULL;
 906         }
 907
 908         netif_stop_queue(dev);
 909
 910 #ifdef CONFIG_STMMAC_TIMER
 911         /* Stop and release the timer */
 912         stmmac_close_ext_timer();
 913         if (priv->tm != NULL)
 914                 kfree(priv->tm);
 915 #endif
 916         napi_disable(&priv->napi);
 917         skb_queue_purge(&priv->rx_recycle);
 918
 919         /* Free the IRQ lines */
 920         free_irq(dev->irq, dev);
 921
 922         /* Stop TX/RX DMA and clear the descriptors */
 923         priv->hw->dma->stop_tx(priv->ioaddr);
 924         priv->hw->dma->stop_rx(priv->ioaddr);
 925
 926         /* Release and free the Rx/Tx resources */
 927         free_dma_desc_resources(priv);
 928
 929         /* Disable the MAC Rx/Tx */
 930         stmmac_disable_mac(priv->ioaddr);
 931
 932         netif_carrier_off(dev);
 933
 934         return 0;
 935 }
 936
 937 static unsigned int stmmac_handle_jumbo_frames(struct sk_buff *skb,
 938                                                struct net_device *dev,
 939                                                int csum_insertion)
 940 {
 941         struct stmmac_priv *priv = netdev_priv(dev);
 942         unsigned int nopaged_len = skb_headlen(skb);
 943         unsigned int txsize = priv->dma_tx_size;
 944         unsigned int entry = priv->cur_tx % txsize;
 945         struct dma_desc *desc = priv->dma_tx + entry;
 946
 947         if (nopaged_len > BUF_SIZE_8KiB) {
 948
 949                 int buf2_size = nopaged_len - BUF_SIZE_8KiB;
 950
 951                 desc->des2 = dma_map_single(priv->device, skb->data,
 952                                             BUF_SIZE_8KiB, DMA_TO_DEVICE);
 953                 desc->des3 = desc->des2 + BUF_SIZE_4KiB;
 954                 priv->hw->desc->prepare_tx_desc(desc, 1, BUF_SIZE_8KiB,
 955                                                 csum_insertion);
 956
 957                 entry = (++priv->cur_tx) % txsize;
 958                 desc = priv->dma_tx + entry;
 959
 960                 desc->des2 = dma_map_single(priv->device,
 961                                         skb->data + BUF_SIZE_8KiB,
 962                                         buf2_size, DMA_TO_DEVICE);
 963                 desc->des3 = desc->des2 + BUF_SIZE_4KiB;
 964                 priv->hw->desc->prepare_tx_desc(desc, 0, buf2_size,
 965                                                 csum_insertion);
 966                 priv->hw->desc->set_tx_owner(desc);
 967                 priv->tx_skbuff[entry] = NULL;
 968         } else {
 969                 desc->des2 = dma_map_single(priv->device, skb->data,
 970                                         nopaged_len, DMA_TO_DEVICE);
 971                 desc->des3 = desc->des2 + BUF_SIZE_4KiB;
 972                 priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
 973                                                 csum_insertion);
 974         }
 975         return entry;
 976 }
 977
 978 /**
 979  *  stmmac_xmit:
 980  *  @skb : the socket buffer
 981  *  @dev : device pointer
 982  *  Description : Tx entry point of the driver.
 983  */
 984 static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
 985 {
 986         struct stmmac_priv *priv = netdev_priv(dev);
 987         unsigned int txsize = priv->dma_tx_size;
 988         unsigned int entry;
 989         int i, csum_insertion = 0;
 990         int nfrags = skb_shinfo(skb)->nr_frags;
 991         struct dma_desc *desc, *first;
 992
 993         if (unlikely(stmmac_tx_avail(priv) < nfrags + 1)) {
 994                 if (!netif_queue_stopped(dev)) {
 995                         netif_stop_queue(dev);
 996                         /* This is a hard error, log it. */
 997                         pr_err("%s: BUG! Tx Ring full when queue awake\n",
 998                                 __func__);
 999                 }
1000                 return NETDEV_TX_BUSY;
1001         }
1002
1003         entry = priv->cur_tx % txsize;
1004
1005 #ifdef STMMAC_XMIT_DEBUG
1006         if ((skb->len > ETH_FRAME_LEN) || nfrags)
1007                 pr_info("stmmac xmit:\n"
1008                        "\tskb addr %p - len: %d - nopaged_len: %d\n"
1009                        "\tn_frags: %d - ip_summed: %d - %s gso\n",
1010                        skb, skb->len, skb_headlen(skb), nfrags, skb->ip_summed,
1011                        !skb_is_gso(skb) ? "isn't" : "is");
1012 #endif
1013
1014         csum_insertion = (skb->ip_summed == CHECKSUM_PARTIAL);
1015
1016         desc = priv->dma_tx + entry;
1017         first = desc;
1018
1019 #ifdef STMMAC_XMIT_DEBUG
1020         if ((nfrags > 0) || (skb->len > ETH_FRAME_LEN))
1021                 pr_debug("stmmac xmit: skb len: %d, nopaged_len: %d,\n"
1022                        "\t\tn_frags: %d, ip_summed: %d\n",
1023                        skb->len, skb_headlen(skb), nfrags, skb->ip_summed);
1024 #endif
1025         priv->tx_skbuff[entry] = skb;
1026         if (unlikely(skb->len >= BUF_SIZE_4KiB)) {
1027                 entry = stmmac_handle_jumbo_frames(skb, dev, csum_insertion);
1028                 desc = priv->dma_tx + entry;
1029         } else {
1030                 unsigned int nopaged_len = skb_headlen(skb);
1031                 desc->des2 = dma_map_single(priv->device, skb->data,
1032                                         nopaged_len, DMA_TO_DEVICE);
1033                 priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
1034                                                 csum_insertion);
1035         }
1036
1037         for (i = 0; i < nfrags; i++) {
1038                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1039                 int len = frag->size;
1040
1041                 entry = (++priv->cur_tx) % txsize;
1042                 desc = priv->dma_tx + entry;
1043
1044                 TX_DBG("\t[entry %d] segment len: %d\n", entry, len);
1045                 desc->des2 = dma_map_page(priv->device, frag->page,
1046                                           frag->page_offset,
1047                                           len, DMA_TO_DEVICE);
1048                 priv->tx_skbuff[entry] = NULL;
1049                 priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion);
1050                 wmb();
1051                 priv->hw->desc->set_tx_owner(desc);
1052         }
1053
1054         /* Interrupt on completition only for the latest segment */
1055         priv->hw->desc->close_tx_desc(desc);
1056
1057 #ifdef CONFIG_STMMAC_TIMER
1058         /* Clean IC while using timer */
1059         if (likely(priv->tm->enable))
1060                 priv->hw->desc->clear_tx_ic(desc);
1061 #endif
1062
1063         wmb();
1064
1065         /* To avoid raise condition */
1066         priv->hw->desc->set_tx_owner(first);
1067
1068         priv->cur_tx++;
1069
1070 #ifdef STMMAC_XMIT_DEBUG
1071         if (netif_msg_pktdata(priv)) {
1072                 pr_info("stmmac xmit: current=%d, dirty=%d, entry=%d, "
1073                        "first=%p, nfrags=%d\n",
1074                        (priv->cur_tx % txsize), (priv->dirty_tx % txsize),
1075                        entry, first, nfrags);
1076                 display_ring(priv->dma_tx, txsize);
1077                 pr_info(">>> frame to be transmitted: ");
1078                 print_pkt(skb->data, skb->len);
1079         }
1080 #endif
1081         if (unlikely(stmmac_tx_avail(priv) <= (MAX_SKB_FRAGS + 1))) {
1082                 TX_DBG("%s: stop transmitted packets\n", __func__);
1083                 netif_stop_queue(dev);
1084         }
1085
1086         dev->stats.tx_bytes += skb->len;
1087
1088         skb_tx_timestamp(skb);
1089
1090         priv->hw->dma->enable_dma_transmission(priv->ioaddr);
1091
1092         return NETDEV_TX_OK;
1093 }
1094
1095 static inline void stmmac_rx_refill(struct stmmac_priv *priv)
1096 {
1097         unsigned int rxsize = priv->dma_rx_size;
1098         int bfsize = priv->dma_buf_sz;
1099         struct dma_desc *p = priv->dma_rx;
1100
1101         for (; priv->cur_rx - priv->dirty_rx > 0; priv->dirty_rx++) {
1102                 unsigned int entry = priv->dirty_rx % rxsize;
1103                 if (likely(priv->rx_skbuff[entry] == NULL)) {
1104                         struct sk_buff *skb;
1105
1106                         skb = __skb_dequeue(&priv->rx_recycle);
1107                         if (skb == NULL)
1108                                 skb = netdev_alloc_skb_ip_align(priv->dev,
1109                                                                 bfsize);
1110
1111                         if (unlikely(skb == NULL))
1112                                 break;
1113
1114                         priv->rx_skbuff[entry] = skb;
1115                         priv->rx_skbuff_dma[entry] =
1116                             dma_map_single(priv->device, skb->data, bfsize,
1117                                            DMA_FROM_DEVICE);
1118
1119                         (p + entry)->des2 = priv->rx_skbuff_dma[entry];
1120                         if (unlikely(priv->plat->has_gmac)) {
1121                                 if (bfsize >= BUF_SIZE_8KiB)
1122                                         (p + entry)->des3 =
1123                                             (p + entry)->des2 + BUF_SIZE_8KiB;
1124                         }
1125                         RX_DBG(KERN_INFO "\trefill entry #%d\n", entry);
1126                 }
1127                 wmb();
1128                 priv->hw->desc->set_rx_owner(p + entry);
1129         }
1130 }
1131
1132 static int stmmac_rx(struct stmmac_priv *priv, int limit)
1133 {
1134         unsigned int rxsize = priv->dma_rx_size;
1135         unsigned int entry = priv->cur_rx % rxsize;
1136         unsigned int next_entry;
1137         unsigned int count = 0;
1138         struct dma_desc *p = priv->dma_rx + entry;
1139         struct dma_desc *p_next;
1140
1141 #ifdef STMMAC_RX_DEBUG
1142         if (netif_msg_hw(priv)) {
1143                 pr_debug(">>> stmmac_rx: descriptor ring:\n");
1144                 display_ring(priv->dma_rx, rxsize);
1145         }
1146 #endif
1147         count = 0;
1148         while (!priv->hw->desc->get_rx_owner(p)) {
1149                 int status;
1150
1151                 if (count >= limit)
1152                         break;
1153
1154                 count++;
1155
1156                 next_entry = (++priv->cur_rx) % rxsize;
1157                 p_next = priv->dma_rx + next_entry;
1158                 prefetch(p_next);
1159
1160                 /* read the status of the incoming frame */
1161                 status = (priv->hw->desc->rx_status(&priv->dev->stats,
1162                                                     &priv->xstats, p));
1163                 if (unlikely(status == discard_frame))
1164                         priv->dev->stats.rx_errors++;
1165                 else {
1166                         struct sk_buff *skb;
1167                         int frame_len;
1168
1169                         frame_len = priv->hw->desc->get_rx_frame_len(p);
1170                         /* ACS is set; GMAC core strips PAD/FCS for IEEE 802.3
1171                          * Type frames (LLC/LLC-SNAP) */
1172                         if (unlikely(status != llc_snap))
1173                                 frame_len -= ETH_FCS_LEN;
1174 #ifdef STMMAC_RX_DEBUG
1175                         if (frame_len > ETH_FRAME_LEN)
1176                                 pr_debug("\tRX frame size %d, COE status: %d\n",
1177                                         frame_len, status);
1178
1179                         if (netif_msg_hw(priv))
1180                                 pr_debug("\tdesc: %p [entry %d] buff=0x%x\n",
1181                                         p, entry, p->des2);
1182 #endif
1183                         skb = priv->rx_skbuff[entry];
1184                         if (unlikely(!skb)) {
1185                                 pr_err("%s: Inconsistent Rx descriptor chain\n",
1186                                         priv->dev->name);
1187                                 priv->dev->stats.rx_dropped++;
1188                                 break;
1189                         }
1190                         prefetch(skb->data - NET_IP_ALIGN);
1191                         priv->rx_skbuff[entry] = NULL;
1192
1193                         skb_put(skb, frame_len);
1194                         dma_unmap_single(priv->device,
1195                                          priv->rx_skbuff_dma[entry],
1196                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
1197 #ifdef STMMAC_RX_DEBUG
1198                         if (netif_msg_pktdata(priv)) {
1199                                 pr_info(" frame received (%dbytes)", frame_len);
1200                                 print_pkt(skb->data, frame_len);
1201                         }
1202 #endif
1203                         skb->protocol = eth_type_trans(skb, priv->dev);
1204
1205                         if (unlikely(status == csum_none)) {
1206                                 /* always for the old mac 10/100 */
1207                                 skb_checksum_none_assert(skb);
1208                                 netif_receive_skb(skb);
1209                         } else {
1210                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1211                                 napi_gro_receive(&priv->napi, skb);
1212                         }
1213
1214                         priv->dev->stats.rx_packets++;
1215                         priv->dev->stats.rx_bytes += frame_len;
1216                 }
1217                 entry = next_entry;
1218                 p = p_next;     /* use prefetched values */
1219         }
1220
1221         stmmac_rx_refill(priv);
1222
1223         priv->xstats.rx_pkt_n += count;
1224
1225         return count;
1226 }
1227
1228 /**
1229  *  stmmac_poll - stmmac poll method (NAPI)
1230  *  @napi : pointer to the napi structure.
1231  *  @budget : maximum number of packets that the current CPU can receive from
1232  *            all interfaces.
1233  *  Description :
1234  *   This function implements the the reception process.
1235  *   Also it runs the TX completion thread
1236  */
1237 static int stmmac_poll(struct napi_struct *napi, int budget)
1238 {
1239         struct stmmac_priv *priv = container_of(napi, struct stmmac_priv, napi);
1240         int work_done = 0;
1241
1242         priv->xstats.poll_n++;
1243         stmmac_tx(priv);
1244         work_done = stmmac_rx(priv, budget);
1245
1246         if (work_done < budget) {
1247                 napi_complete(napi);
1248                 stmmac_enable_irq(priv);
1249         }
1250         return work_done;
1251 }
1252
1253 /**
1254  *  stmmac_tx_timeout
1255  *  @dev : Pointer to net device structure
1256  *  Description: this function is called when a packet transmission fails to
1257  *   complete within a reasonable tmrate. The driver will mark the error in the
1258  *   netdev structure and arrange for the device to be reset to a sane state
1259  *   in order to transmit a new packet.
1260  */
1261 static void stmmac_tx_timeout(struct net_device *dev)
1262 {
1263         struct stmmac_priv *priv = netdev_priv(dev);
1264
1265         /* Clear Tx resources and restart transmitting again */
1266         stmmac_tx_err(priv);
1267 }
1268
1269 /* Configuration changes (passed on by ifconfig) */
1270 static int stmmac_config(struct net_device *dev, struct ifmap *map)
1271 {
1272         if (dev->flags & IFF_UP)        /* can't act on a running interface */
1273                 return -EBUSY;
1274
1275         /* Don't allow changing the I/O address */
1276         if (map->base_addr != dev->base_addr) {
1277                 pr_warning("%s: can't change I/O address\n", dev->name);
1278                 return -EOPNOTSUPP;
1279         }
1280
1281         /* Don't allow changing the IRQ */
1282         if (map->irq != dev->irq) {
1283                 pr_warning("%s: can't change IRQ number %d\n",
1284                        dev->name, dev->irq);
1285                 return -EOPNOTSUPP;
1286         }
1287
1288         /* ignore other fields */
1289         return 0;
1290 }
1291
1292 /**
1293  *  stmmac_multicast_list - entry point for multicast addressing
1294  *  @dev : pointer to the device structure
1295  *  Description:
1296  *  This function is a driver entry point which gets called by the kernel
1297  *  whenever multicast addresses must be enabled/disabled.
1298  *  Return value:
1299  *  void.
1300  */
1301 static void stmmac_multicast_list(struct net_device *dev)
1302 {
1303         struct stmmac_priv *priv = netdev_priv(dev);
1304
1305         spin_lock(&priv->lock);
1306         priv->hw->mac->set_filter(dev);
1307         spin_unlock(&priv->lock);
1308 }
1309
1310 /**
1311  *  stmmac_change_mtu - entry point to change MTU size for the device.
1312  *  @dev : device pointer.
1313  *  @new_mtu : the new MTU size for the device.
1314  *  Description: the Maximum Transfer Unit (MTU) is used by the network layer
1315  *  to drive packet transmission. Ethernet has an MTU of 1500 octets
1316  *  (ETH_DATA_LEN). This value can be changed with ifconfig.
1317  *  Return value:
1318  *  0 on success and an appropriate (-)ve integer as defined in errno.h
1319  *  file on failure.
1320  */
1321 static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
1322 {
1323         struct stmmac_priv *priv = netdev_priv(dev);
1324         int max_mtu;
1325
1326         if (netif_running(dev)) {
1327                 pr_err("%s: must be stopped to change its MTU\n", dev->name);
1328                 return -EBUSY;
1329         }
1330
1331         if (priv->plat->has_gmac)
1332                 max_mtu = JUMBO_LEN;
1333         else
1334                 max_mtu = ETH_DATA_LEN;
1335
1336         if ((new_mtu < 46) || (new_mtu > max_mtu)) {
1337                 pr_err("%s: invalid MTU, max MTU is: %d\n", dev->name, max_mtu);
1338                 return -EINVAL;
1339         }
1340
1341         dev->mtu = new_mtu;
1342         netdev_update_features(dev);
1343
1344         return 0;
1345 }
1346
1347 static u32 stmmac_fix_features(struct net_device *dev, u32 features)
1348 {
1349         struct stmmac_priv *priv = netdev_priv(dev);
1350
1351         if (!priv->rx_coe)
1352                 features &= ~NETIF_F_RXCSUM;
1353         if (!priv->plat->tx_coe)
1354                 features &= ~NETIF_F_ALL_CSUM;
1355
1356         /* Some GMAC devices have a bugged Jumbo frame support that
1357          * needs to have the Tx COE disabled for oversized frames
1358          * (due to limited buffer sizes). In this case we disable
1359          * the TX csum insertionin the TDES and not use SF. */
1360         if (priv->plat->bugged_jumbo && (dev->mtu > ETH_DATA_LEN))
1361                 features &= ~NETIF_F_ALL_CSUM;
1362
1363         return features;
1364 }
1365
1366 static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
1367 {
1368         struct net_device *dev = (struct net_device *)dev_id;
1369         struct stmmac_priv *priv = netdev_priv(dev);
1370
1371         if (unlikely(!dev)) {
1372                 pr_err("%s: invalid dev pointer\n", __func__);
1373                 return IRQ_NONE;
1374         }
1375
1376         if (priv->plat->has_gmac)
1377                 /* To handle GMAC own interrupts */
1378                 priv->hw->mac->host_irq_status((void __iomem *) dev->base_addr);
1379
1380         stmmac_dma_interrupt(priv);
1381
1382         return IRQ_HANDLED;
1383 }
1384
1385 #ifdef CONFIG_NET_POLL_CONTROLLER
1386 /* Polling receive - used by NETCONSOLE and other diagnostic tools
1387  * to allow network I/O with interrupts disabled. */
1388 static void stmmac_poll_controller(struct net_device *dev)
1389 {
1390         disable_irq(dev->irq);
1391         stmmac_interrupt(dev->irq, dev);
1392         enable_irq(dev->irq);
1393 }
1394 #endif
1395
1396 /**
1397  *  stmmac_ioctl - Entry point for the Ioctl
1398  *  @dev: Device pointer.
1399  *  @rq: An IOCTL specefic structure, that can contain a pointer to
1400  *  a proprietary structure used to pass information to the driver.
1401  *  @cmd: IOCTL command
1402  *  Description:
1403  *  Currently there are no special functionality supported in IOCTL, just the
1404  *  phy_mii_ioctl(...) can be invoked.
1405  */
1406 static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1407 {
1408         struct stmmac_priv *priv = netdev_priv(dev);
1409         int ret;
1410
1411         if (!netif_running(dev))
1412                 return -EINVAL;
1413
1414         if (!priv->phydev)
1415                 return -EINVAL;
1416
1417         spin_lock(&priv->lock);
1418         ret = phy_mii_ioctl(priv->phydev, rq, cmd);
1419         spin_unlock(&priv->lock);
1420
1421         return ret;
1422 }
1423
1424 static const struct net_device_ops stmmac_netdev_ops = {
1425         .ndo_open = stmmac_open,
1426         .ndo_start_xmit = stmmac_xmit,
1427         .ndo_stop = stmmac_release,
1428         .ndo_change_mtu = stmmac_change_mtu,
1429         .ndo_fix_features = stmmac_fix_features,
1430         .ndo_set_multicast_list = stmmac_multicast_list,
1431         .ndo_tx_timeout = stmmac_tx_timeout,
1432         .ndo_do_ioctl = stmmac_ioctl,
1433         .ndo_set_config = stmmac_config,
1434 #ifdef CONFIG_NET_POLL_CONTROLLER
1435         .ndo_poll_controller = stmmac_poll_controller,
1436 #endif
1437         .ndo_set_mac_address = eth_mac_addr,
1438 };
1439
1440 /**
1441  * stmmac_probe - Initialization of the adapter .
1442  * @dev : device pointer
1443  * Description: The function initializes the network device structure for
1444  * the STMMAC driver. It also calls the low level routines
1445  * in order to init the HW (i.e. the DMA engine)
1446  */
1447 static int stmmac_probe(struct net_device *dev)
1448 {
1449         int ret = 0;
1450         struct stmmac_priv *priv = netdev_priv(dev);
1451
1452         ether_setup(dev);
1453
1454         dev->netdev_ops = &stmmac_netdev_ops;
1455         stmmac_set_ethtool_ops(dev);
1456
1457         dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1458         dev->features |= dev->hw_features | NETIF_F_HIGHDMA;
1459         dev->watchdog_timeo = msecs_to_jiffies(watchdog);
1460 #ifdef STMMAC_VLAN_TAG_USED
1461         /* Both mac100 and gmac support receive VLAN tag detection */
1462         dev->features |= NETIF_F_HW_VLAN_RX;
1463 #endif
1464         priv->msg_enable = netif_msg_init(debug, default_msg_level);
1465
1466         if (flow_ctrl)
1467                 priv->flow_ctrl = FLOW_AUTO;    /* RX/TX pause on */
1468
1469         priv->pause = pause;
1470         netif_napi_add(dev, &priv->napi, stmmac_poll, 64);
1471
1472         /* Get the MAC address */
1473         priv->hw->mac->get_umac_addr((void __iomem *) dev->base_addr,
1474                                      dev->dev_addr, 0);
1475
1476         if (!is_valid_ether_addr(dev->dev_addr))
1477                 pr_warning("\tno valid MAC address;"
1478                         "please, use ifconfig or nwhwconfig!\n");
1479
1480         spin_lock_init(&priv->lock);
1481
1482         ret = register_netdev(dev);
1483         if (ret) {
1484                 pr_err("%s: ERROR %i registering the device\n",
1485                        __func__, ret);
1486                 return -ENODEV;
1487         }
1488
1489         DBG(probe, DEBUG, "%s: Scatter/Gather: %s - HW checksums: %s\n",
1490             dev->name, (dev->features & NETIF_F_SG) ? "on" : "off",
1491             (dev->features & NETIF_F_IP_CSUM) ? "on" : "off");
1492
1493         return ret;
1494 }
1495
1496 /**
1497  * stmmac_mac_device_setup
1498  * @dev : device pointer
1499  * Description: select and initialise the mac device (mac100 or Gmac).
1500  */
1501 static int stmmac_mac_device_setup(struct net_device *dev)
1502 {
1503         struct stmmac_priv *priv = netdev_priv(dev);
1504
1505         struct mac_device_info *device;
1506
1507         if (priv->plat->has_gmac)
1508                 device = dwmac1000_setup(priv->ioaddr);
1509         else
1510                 device = dwmac100_setup(priv->ioaddr);
1511
1512         if (!device)
1513                 return -ENOMEM;
1514
1515         if (priv->plat->enh_desc) {
1516                 device->desc = &enh_desc_ops;
1517                 pr_info("\tEnhanced descriptor structure\n");
1518         } else
1519                 device->desc = &ndesc_ops;
1520
1521         priv->hw = device;
1522
1523         if (device_can_wakeup(priv->device)) {
1524                 priv->wolopts = WAKE_MAGIC; /* Magic Frame as default */
1525                 enable_irq_wake(dev->irq);
1526         }
1527
1528         return 0;
1529 }
1530
1531 static int stmmacphy_dvr_probe(struct platform_device *pdev)
1532 {
1533         struct plat_stmmacphy_data *plat_dat = pdev->dev.platform_data;
1534
1535         pr_debug("stmmacphy_dvr_probe: added phy for bus %d\n",
1536                plat_dat->bus_id);
1537
1538         return 0;
1539 }
1540
1541 static int stmmacphy_dvr_remove(struct platform_device *pdev)
1542 {
1543         return 0;
1544 }
1545
1546 static struct platform_driver stmmacphy_driver = {
1547         .driver = {
1548                    .name = PHY_RESOURCE_NAME,
1549                    },
1550         .probe = stmmacphy_dvr_probe,
1551         .remove = stmmacphy_dvr_remove,
1552 };
1553
1554 /**
1555  * stmmac_associate_phy
1556  * @dev: pointer to device structure
1557  * @data: points to the private structure.
1558  * Description: Scans through all the PHYs we have registered and checks if
1559  * any are associated with our MAC.  If so, then just fill in
1560  * the blanks in our local context structure
1561  */
1562 static int stmmac_associate_phy(struct device *dev, void *data)
1563 {
1564         struct stmmac_priv *priv = (struct stmmac_priv *)data;
1565         struct plat_stmmacphy_data *plat_dat = dev->platform_data;
1566
1567         DBG(probe, DEBUG, "%s: checking phy for bus %d\n", __func__,
1568                 plat_dat->bus_id);
1569
1570         /* Check that this phy is for the MAC being initialised */
1571         if (priv->plat->bus_id != plat_dat->bus_id)
1572                 return 0;
1573
1574         /* OK, this PHY is connected to the MAC.
1575            Go ahead and get the parameters */
1576         DBG(probe, DEBUG, "%s: OK. Found PHY config\n", __func__);
1577         priv->phy_irq =
1578             platform_get_irq_byname(to_platform_device(dev), "phyirq");
1579         DBG(probe, DEBUG, "%s: PHY irq on bus %d is %d\n", __func__,
1580             plat_dat->bus_id, priv->phy_irq);
1581
1582         /* Override with kernel parameters if supplied XXX CRS XXX
1583          * this needs to have multiple instances */
1584         if ((phyaddr >= 0) && (phyaddr <= 31))
1585                 plat_dat->phy_addr = phyaddr;
1586
1587         priv->phy_addr = plat_dat->phy_addr;
1588         priv->phy_mask = plat_dat->phy_mask;
1589         priv->phy_interface = plat_dat->interface;
1590         priv->phy_reset = plat_dat->phy_reset;
1591
1592         DBG(probe, DEBUG, "%s: exiting\n", __func__);
1593         return 1;       /* forces exit of driver_for_each_device() */
1594 }
1595
1596 /**
1597  * stmmac_dvr_probe
1598  * @pdev: platform device pointer
1599  * Description: the driver is initialized through platform_device.
1600  */
1601 static int stmmac_dvr_probe(struct platform_device *pdev)
1602 {
1603         int ret = 0;
1604         struct resource *res;
1605         void __iomem *addr = NULL;
1606         struct net_device *ndev = NULL;
1607         struct stmmac_priv *priv = NULL;
1608         struct plat_stmmacenet_data *plat_dat;
1609
1610         pr_info("STMMAC driver:\n\tplatform registration... ");
1611         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1612         if (!res)
1613                 return -ENODEV;
1614         pr_info("\tdone!\n");
1615
1616         if (!request_mem_region(res->start, resource_size(res),
1617                                 pdev->name)) {
1618                 pr_err("%s: ERROR: memory allocation failed"
1619                        "cannot get the I/O addr 0x%x\n",
1620                        __func__, (unsigned int)res->start);
1621                 return -EBUSY;
1622         }
1623
1624         addr = ioremap(res->start, resource_size(res));
1625         if (!addr) {
1626                 pr_err("%s: ERROR: memory mapping failed\n", __func__);
1627                 ret = -ENOMEM;
1628                 goto out_release_region;
1629         }
1630
1631         ndev = alloc_etherdev(sizeof(struct stmmac_priv));
1632         if (!ndev) {
1633                 pr_err("%s: ERROR: allocating the device\n", __func__);
1634                 ret = -ENOMEM;
1635                 goto out_unmap;
1636         }
1637
1638         SET_NETDEV_DEV(ndev, &pdev->dev);
1639
1640         /* Get the MAC information */
1641         ndev->irq = platform_get_irq_byname(pdev, "macirq");
1642         if (ndev->irq == -ENXIO) {
1643                 pr_err("%s: ERROR: MAC IRQ configuration "
1644                        "information not found\n", __func__);
1645                 ret = -ENXIO;
1646                 goto out_free_ndev;
1647         }
1648
1649         priv = netdev_priv(ndev);
1650         priv->device = &(pdev->dev);
1651         priv->dev = ndev;
1652         plat_dat = pdev->dev.platform_data;
1653
1654         priv->plat = plat_dat;
1655
1656         priv->ioaddr = addr;
1657
1658         /* PMT module is not integrated in all the MAC devices. */
1659         if (plat_dat->pmt) {
1660                 pr_info("\tPMT module supported\n");
1661                 device_set_wakeup_capable(&pdev->dev, 1);
1662         }
1663
1664         platform_set_drvdata(pdev, ndev);
1665
1666         /* Set the I/O base addr */
1667         ndev->base_addr = (unsigned long)addr;
1668
1669         /* Custom initialisation */
1670         if (priv->plat->init) {
1671                 ret = priv->plat->init(pdev);
1672                 if (unlikely(ret))
1673                         goto out_free_ndev;
1674         }
1675
1676         /* MAC HW revice detection */
1677         ret = stmmac_mac_device_setup(ndev);
1678         if (ret < 0)
1679                 goto out_plat_exit;
1680
1681         /* Network Device Registration */
1682         ret = stmmac_probe(ndev);
1683         if (ret < 0)
1684                 goto out_plat_exit;
1685
1686         /* associate a PHY - it is provided by another platform bus */
1687         if (!driver_for_each_device
1688             (&(stmmacphy_driver.driver), NULL, (void *)priv,
1689              stmmac_associate_phy)) {
1690                 pr_err("No PHY device is associated with this MAC!\n");
1691                 ret = -ENODEV;
1692                 goto out_unregister;
1693         }
1694
1695         pr_info("\t%s - (dev. name: %s - id: %d, IRQ #%d\n"
1696                "\tIO base addr: 0x%p)\n", ndev->name, pdev->name,
1697                pdev->id, ndev->irq, addr);
1698
1699         /* MDIO bus Registration */
1700         pr_debug("\tMDIO bus (id: %d)...", priv->plat->bus_id);
1701         ret = stmmac_mdio_register(ndev);
1702         if (ret < 0)
1703                 goto out_unregister;
1704         pr_debug("registered!\n");
1705         return 0;
1706
1707 out_unregister:
1708         unregister_netdev(ndev);
1709 out_plat_exit:
1710         if (priv->plat->exit)
1711                 priv->plat->exit(pdev);
1712 out_free_ndev:
1713         free_netdev(ndev);
1714         platform_set_drvdata(pdev, NULL);
1715 out_unmap:
1716         iounmap(addr);
1717 out_release_region:
1718         release_mem_region(res->start, resource_size(res));
1719
1720         return ret;
1721 }
1722
1723 /**
1724  * stmmac_dvr_remove
1725  * @pdev: platform device pointer
1726  * Description: this function resets the TX/RX processes, disables the MAC RX/TX
1727  * changes the link status, releases the DMA descriptor rings,
1728  * unregisters the MDIO bus and unmaps the allocated memory.
1729  */
1730 static int stmmac_dvr_remove(struct platform_device *pdev)
1731 {
1732         struct net_device *ndev = platform_get_drvdata(pdev);
1733         struct stmmac_priv *priv = netdev_priv(ndev);
1734         struct resource *res;
1735
1736         pr_info("%s:\n\tremoving driver", __func__);
1737
1738         priv->hw->dma->stop_rx(priv->ioaddr);
1739         priv->hw->dma->stop_tx(priv->ioaddr);
1740
1741         stmmac_disable_mac(priv->ioaddr);
1742
1743         netif_carrier_off(ndev);
1744
1745         stmmac_mdio_unregister(ndev);
1746
1747         if (priv->plat->exit)
1748                 priv->plat->exit(pdev);
1749
1750         platform_set_drvdata(pdev, NULL);
1751         unregister_netdev(ndev);
1752
1753         iounmap((void *)priv->ioaddr);
1754         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1755         release_mem_region(res->start, resource_size(res));
1756
1757         free_netdev(ndev);
1758
1759         return 0;
1760 }
1761
1762 #ifdef CONFIG_PM
1763 static int stmmac_suspend(struct device *dev)
1764 {
1765         struct net_device *ndev = dev_get_drvdata(dev);
1766         struct stmmac_priv *priv = netdev_priv(ndev);
1767         int dis_ic = 0;
1768
1769         if (!ndev || !netif_running(ndev))
1770                 return 0;
1771
1772         spin_lock(&priv->lock);
1773
1774         netif_device_detach(ndev);
1775         netif_stop_queue(ndev);
1776         if (priv->phydev)
1777                 phy_stop(priv->phydev);
1778
1779 #ifdef CONFIG_STMMAC_TIMER
1780         priv->tm->timer_stop();
1781         if (likely(priv->tm->enable))
1782                 dis_ic = 1;
1783 #endif
1784         napi_disable(&priv->napi);
1785
1786         /* Stop TX/RX DMA */
1787         priv->hw->dma->stop_tx(priv->ioaddr);
1788         priv->hw->dma->stop_rx(priv->ioaddr);
1789         /* Clear the Rx/Tx descriptors */
1790         priv->hw->desc->init_rx_desc(priv->dma_rx, priv->dma_rx_size,
1791                                      dis_ic);
1792         priv->hw->desc->init_tx_desc(priv->dma_tx, priv->dma_tx_size);
1793
1794         /* Enable Power down mode by programming the PMT regs */
1795         if (device_may_wakeup(priv->device))
1796                 priv->hw->mac->pmt(priv->ioaddr, priv->wolopts);
1797         else
1798                 stmmac_disable_mac(priv->ioaddr);
1799
1800         spin_unlock(&priv->lock);
1801         return 0;
1802 }
1803
1804 static int stmmac_resume(struct device *dev)
1805 {
1806         struct net_device *ndev = dev_get_drvdata(dev);
1807         struct stmmac_priv *priv = netdev_priv(ndev);
1808
1809         if (!netif_running(ndev))
1810                 return 0;
1811
1812         spin_lock(&priv->lock);
1813
1814         /* Power Down bit, into the PM register, is cleared
1815          * automatically as soon as a magic packet or a Wake-up frame
1816          * is received. Anyway, it's better to manually clear
1817          * this bit because it can generate problems while resuming
1818          * from another devices (e.g. serial console). */
1819         if (device_may_wakeup(priv->device))
1820                 priv->hw->mac->pmt(priv->ioaddr, 0);
1821
1822         netif_device_attach(ndev);
1823
1824         /* Enable the MAC and DMA */
1825         stmmac_enable_mac(priv->ioaddr);
1826         priv->hw->dma->start_tx(priv->ioaddr);
1827         priv->hw->dma->start_rx(priv->ioaddr);
1828
1829 #ifdef CONFIG_STMMAC_TIMER
1830         if (likely(priv->tm->enable))
1831                 priv->tm->timer_start(tmrate);
1832 #endif
1833         napi_enable(&priv->napi);
1834
1835         if (priv->phydev)
1836                 phy_start(priv->phydev);
1837
1838         netif_start_queue(ndev);
1839
1840         spin_unlock(&priv->lock);
1841         return 0;
1842 }
1843
1844 static int stmmac_freeze(struct device *dev)
1845 {
1846         struct net_device *ndev = dev_get_drvdata(dev);
1847
1848         if (!ndev || !netif_running(ndev))
1849                 return 0;
1850
1851         return stmmac_release(ndev);
1852 }
1853
1854 static int stmmac_restore(struct device *dev)
1855 {
1856         struct net_device *ndev = dev_get_drvdata(dev);
1857
1858         if (!ndev || !netif_running(ndev))
1859                 return 0;
1860
1861         return stmmac_open(ndev);
1862 }
1863
1864 static const struct dev_pm_ops stmmac_pm_ops = {
1865         .suspend = stmmac_suspend,
1866         .resume = stmmac_resume,
1867         .freeze = stmmac_freeze,
1868         .thaw = stmmac_restore,
1869         .restore = stmmac_restore,
1870 };
1871 #else
1872 static const struct dev_pm_ops stmmac_pm_ops;
1873 #endif /* CONFIG_PM */
1874
1875 static struct platform_driver stmmac_driver = {
1876         .probe = stmmac_dvr_probe,
1877         .remove = stmmac_dvr_remove,
1878         .driver = {
1879                 .name = STMMAC_RESOURCE_NAME,
1880                 .owner = THIS_MODULE,
1881                 .pm = &stmmac_pm_ops,
1882         },
1883 };
1884
1885 /**
1886  * stmmac_init_module - Entry point for the driver
1887  * Description: This function is the entry point for the driver.
1888  */
1889 static int __init stmmac_init_module(void)
1890 {
1891         int ret;
1892
1893         if (platform_driver_register(&stmmacphy_driver)) {
1894                 pr_err("No PHY devices registered!\n");
1895                 return -ENODEV;
1896         }
1897
1898         ret = platform_driver_register(&stmmac_driver);
1899         return ret;
1900 }
1901
1902 /**
1903  * stmmac_cleanup_module - Cleanup routine for the driver
1904  * Description: This function is the cleanup routine for the driver.
1905  */
1906 static void __exit stmmac_cleanup_module(void)
1907 {
1908         platform_driver_unregister(&stmmacphy_driver);
1909         platform_driver_unregister(&stmmac_driver);
1910 }
1911
1912 #ifndef MODULE
1913 static int __init stmmac_cmdline_opt(char *str)
1914 {
1915         char *opt;
1916
1917         if (!str || !*str)
1918                 return -EINVAL;
1919         while ((opt = strsep(&str, ",")) != NULL) {
1920                 if (!strncmp(opt, "debug:", 6)) {
1921                         if (strict_strtoul(opt + 6, 0, (unsigned long *)&debug))
1922                                 goto err;
1923                 } else if (!strncmp(opt, "phyaddr:", 8)) {
1924                         if (strict_strtoul(opt + 8, 0,
1925                                            (unsigned long *)&phyaddr))
1926                                 goto err;
1927                 } else if (!strncmp(opt, "dma_txsize:", 11)) {
1928                         if (strict_strtoul(opt + 11, 0,
1929                                            (unsigned long *)&dma_txsize))
1930                                 goto err;
1931                 } else if (!strncmp(opt, "dma_rxsize:", 11)) {
1932                         if (strict_strtoul(opt + 11, 0,
1933                                            (unsigned long *)&dma_rxsize))
1934                                 goto err;
1935                 } else if (!strncmp(opt, "buf_sz:", 7)) {
1936                         if (strict_strtoul(opt + 7, 0,
1937                                            (unsigned long *)&buf_sz))
1938                                 goto err;
1939                 } else if (!strncmp(opt, "tc:", 3)) {
1940                         if (strict_strtoul(opt + 3, 0, (unsigned long *)&tc))
1941                                 goto err;
1942                 } else if (!strncmp(opt, "watchdog:", 9)) {
1943                         if (strict_strtoul(opt + 9, 0,
1944                                            (unsigned long *)&watchdog))
1945                                 goto err;
1946                 } else if (!strncmp(opt, "flow_ctrl:", 10)) {
1947                         if (strict_strtoul(opt + 10, 0,
1948                                            (unsigned long *)&flow_ctrl))
1949                                 goto err;
1950                 } else if (!strncmp(opt, "pause:", 6)) {
1951                         if (strict_strtoul(opt + 6, 0, (unsigned long *)&pause))
1952                                 goto err;
1953 #ifdef CONFIG_STMMAC_TIMER
1954                 } else if (!strncmp(opt, "tmrate:", 7)) {
1955                         if (strict_strtoul(opt + 7, 0,
1956                                            (unsigned long *)&tmrate))
1957                                 goto err;
1958 #endif
1959                 }
1960         }
1961         return 0;
1962
1963 err:
1964         pr_err("%s: ERROR broken module parameter conversion", __func__);
1965         return -EINVAL;
1966 }
1967
1968 __setup("stmmaceth=", stmmac_cmdline_opt);
1969 #endif
1970
1971 module_init(stmmac_init_module);
1972 module_exit(stmmac_cleanup_module);
1973
1974 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet driver");
1975 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
1976 MODULE_LICENSE("GPL");