drivers/net/ethernet/stmicro/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) 2007-2011 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/if.h>
  45 #include <linux/if_vlan.h>
  46 #include <linux/dma-mapping.h>
  47 #include <linux/slab.h>
  48 #include <linux/prefetch.h>
  49 #ifdef CONFIG_STMMAC_DEBUG_FS
  50 #include <linux/debugfs.h>
  51 #include <linux/seq_file.h>
  52 #endif
  53 #include "stmmac.h"
  54
  55 #define STMMAC_RESOURCE_NAME    "stmmaceth"
  56
  57 #undef STMMAC_DEBUG
  58 /*#define STMMAC_DEBUG*/
  59 #ifdef STMMAC_DEBUG
  60 #define DBG(nlevel, klevel, fmt, args...) \
  61                 ((void)(netif_msg_##nlevel(priv) && \
  62                 printk(KERN_##klevel fmt, ## args)))
  63 #else
  64 #define DBG(nlevel, klevel, fmt, args...) do { } while (0)
  65 #endif
  66
  67 #undef STMMAC_RX_DEBUG
  68 /*#define STMMAC_RX_DEBUG*/
  69 #ifdef STMMAC_RX_DEBUG
  70 #define RX_DBG(fmt, args...)  printk(fmt, ## args)
  71 #else
  72 #define RX_DBG(fmt, args...)  do { } while (0)
  73 #endif
  74
  75 #undef STMMAC_XMIT_DEBUG
  76 /*#define STMMAC_XMIT_DEBUG*/
  77 #ifdef STMMAC_TX_DEBUG
  78 #define TX_DBG(fmt, args...)  printk(fmt, ## args)
  79 #else
  80 #define TX_DBG(fmt, args...)  do { } while (0)
  81 #endif
  82
  83 #define STMMAC_ALIGN(x) L1_CACHE_ALIGN(x)
  84 #define JUMBO_LEN       9000
  85
  86 /* Module parameters */
  87 #define TX_TIMEO 5000 /* default 5 seconds */
  88 static int watchdog = TX_TIMEO;
  89 module_param(watchdog, int, S_IRUGO | S_IWUSR);
  90 MODULE_PARM_DESC(watchdog, "Transmit timeout in milliseconds");
  91
  92 static int debug = -1;          /* -1: default, 0: no output, 16:  all */
  93 module_param(debug, int, S_IRUGO | S_IWUSR);
  94 MODULE_PARM_DESC(debug, "Message Level (0: no output, 16: all)");
  95
  96 static int phyaddr = -1;
  97 module_param(phyaddr, int, S_IRUGO);
  98 MODULE_PARM_DESC(phyaddr, "Physical device address");
  99
 100 #define DMA_TX_SIZE 256
 101 static int dma_txsize = DMA_TX_SIZE;
 102 module_param(dma_txsize, int, S_IRUGO | S_IWUSR);
 103 MODULE_PARM_DESC(dma_txsize, "Number of descriptors in the TX list");
 104
 105 #define DMA_RX_SIZE 256
 106 static int dma_rxsize = DMA_RX_SIZE;
 107 module_param(dma_rxsize, int, S_IRUGO | S_IWUSR);
 108 MODULE_PARM_DESC(dma_rxsize, "Number of descriptors in the RX list");
 109
 110 static int flow_ctrl = FLOW_OFF;
 111 module_param(flow_ctrl, int, S_IRUGO | S_IWUSR);
 112 MODULE_PARM_DESC(flow_ctrl, "Flow control ability [on/off]");
 113
 114 static int pause = PAUSE_TIME;
 115 module_param(pause, int, S_IRUGO | S_IWUSR);
 116 MODULE_PARM_DESC(pause, "Flow Control Pause Time");
 117
 118 #define TC_DEFAULT 64
 119 static int tc = TC_DEFAULT;
 120 module_param(tc, int, S_IRUGO | S_IWUSR);
 121 MODULE_PARM_DESC(tc, "DMA threshold control value");
 122
 123 /* Pay attention to tune this parameter; take care of both
 124  * hardware capability and network stabitily/performance impact.
 125  * Many tests showed that ~4ms latency seems to be good enough. */
 126 #ifdef CONFIG_STMMAC_TIMER
 127 #define DEFAULT_PERIODIC_RATE   256
 128 static int tmrate = DEFAULT_PERIODIC_RATE;
 129 module_param(tmrate, int, S_IRUGO | S_IWUSR);
 130 MODULE_PARM_DESC(tmrate, "External timer freq. (default: 256Hz)");
 131 #endif
 132
 133 #define DMA_BUFFER_SIZE BUF_SIZE_2KiB
 134 static int buf_sz = DMA_BUFFER_SIZE;
 135 module_param(buf_sz, int, S_IRUGO | S_IWUSR);
 136 MODULE_PARM_DESC(buf_sz, "DMA buffer size");
 137
 138 static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
 139                                       NETIF_MSG_LINK | NETIF_MSG_IFUP |
 140                                       NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);
 141
 142 static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
 143
 144 /**
 145  * stmmac_verify_args - verify the driver parameters.
 146  * Description: it verifies if some wrong parameter is passed to the driver.
 147  * Note that wrong parameters are replaced with the default values.
 148  */
 149 static void stmmac_verify_args(void)
 150 {
 151         if (unlikely(watchdog < 0))
 152                 watchdog = TX_TIMEO;
 153         if (unlikely(dma_rxsize < 0))
 154                 dma_rxsize = DMA_RX_SIZE;
 155         if (unlikely(dma_txsize < 0))
 156                 dma_txsize = DMA_TX_SIZE;
 157         if (unlikely((buf_sz < DMA_BUFFER_SIZE) || (buf_sz > BUF_SIZE_16KiB)))
 158                 buf_sz = DMA_BUFFER_SIZE;
 159         if (unlikely(flow_ctrl > 1))
 160                 flow_ctrl = FLOW_AUTO;
 161         else if (likely(flow_ctrl < 0))
 162                 flow_ctrl = FLOW_OFF;
 163         if (unlikely((pause < 0) || (pause > 0xffff)))
 164                 pause = PAUSE_TIME;
 165 }
 166
 167 #if defined(STMMAC_XMIT_DEBUG) || defined(STMMAC_RX_DEBUG)
 168 static void print_pkt(unsigned char *buf, int len)
 169 {
 170         int j;
 171         pr_info("len = %d byte, buf addr: 0x%p", len, buf);
 172         for (j = 0; j < len; j++) {
 173                 if ((j % 16) == 0)
 174                         pr_info("\n %03x:", j);
 175                 pr_info(" %02x", buf[j]);
 176         }
 177         pr_info("\n");
 178 }
 179 #endif
 180
 181 /* minimum number of free TX descriptors required to wake up TX process */
 182 #define STMMAC_TX_THRESH(x)     (x->dma_tx_size/4)
 183
 184 static inline u32 stmmac_tx_avail(struct stmmac_priv *priv)
 185 {
 186         return priv->dirty_tx + priv->dma_tx_size - priv->cur_tx - 1;
 187 }
 188
 189 /* On some ST platforms, some HW system configuraton registers have to be
 190  * set according to the link speed negotiated.
 191  */
 192 static inline void stmmac_hw_fix_mac_speed(struct stmmac_priv *priv)
 193 {
 194         struct phy_device *phydev = priv->phydev;
 195
 196         if (likely(priv->plat->fix_mac_speed))
 197                 priv->plat->fix_mac_speed(priv->plat->bsp_priv,
 198                                           phydev->speed);
 199 }
 200
 201 /**
 202  * stmmac_adjust_link
 203  * @dev: net device structure
 204  * Description: it adjusts the link parameters.
 205  */
 206 static void stmmac_adjust_link(struct net_device *dev)
 207 {
 208         struct stmmac_priv *priv = netdev_priv(dev);
 209         struct phy_device *phydev = priv->phydev;
 210         unsigned long flags;
 211         int new_state = 0;
 212         unsigned int fc = priv->flow_ctrl, pause_time = priv->pause;
 213
 214         if (phydev == NULL)
 215                 return;
 216
 217         DBG(probe, DEBUG, "stmmac_adjust_link: called.  address %d link %d\n",
 218             phydev->addr, phydev->link);
 219
 220         spin_lock_irqsave(&priv->lock, flags);
 221         if (phydev->link) {
 222                 u32 ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
 223
 224                 /* Now we make sure that we can be in full duplex mode.
 225                  * If not, we operate in half-duplex mode. */
 226                 if (phydev->duplex != priv->oldduplex) {
 227                         new_state = 1;
 228                         if (!(phydev->duplex))
 229                                 ctrl &= ~priv->hw->link.duplex;
 230                         else
 231                                 ctrl |= priv->hw->link.duplex;
 232                         priv->oldduplex = phydev->duplex;
 233                 }
 234                 /* Flow Control operation */
 235                 if (phydev->pause)
 236                         priv->hw->mac->flow_ctrl(priv->ioaddr, phydev->duplex,
 237                                                  fc, pause_time);
 238
 239                 if (phydev->speed != priv->speed) {
 240                         new_state = 1;
 241                         switch (phydev->speed) {
 242                         case 1000:
 243                                 if (likely(priv->plat->has_gmac))
 244                                         ctrl &= ~priv->hw->link.port;
 245                                 stmmac_hw_fix_mac_speed(priv);
 246                                 break;
 247                         case 100:
 248                         case 10:
 249                                 if (priv->plat->has_gmac) {
 250                                         ctrl |= priv->hw->link.port;
 251                                         if (phydev->speed == SPEED_100) {
 252                                                 ctrl |= priv->hw->link.speed;
 253                                         } else {
 254                                                 ctrl &= ~(priv->hw->link.speed);
 255                                         }
 256                                 } else {
 257                                         ctrl &= ~priv->hw->link.port;
 258                                 }
 259                                 stmmac_hw_fix_mac_speed(priv);
 260                                 break;
 261                         default:
 262                                 if (netif_msg_link(priv))
 263                                         pr_warning("%s: Speed (%d) is not 10"
 264                                        " or 100!\n", dev->name, phydev->speed);
 265                                 break;
 266                         }
 267
 268                         priv->speed = phydev->speed;
 269                 }
 270
 271                 writel(ctrl, priv->ioaddr + MAC_CTRL_REG);
 272
 273                 if (!priv->oldlink) {
 274                         new_state = 1;
 275                         priv->oldlink = 1;
 276                 }
 277         } else if (priv->oldlink) {
 278                 new_state = 1;
 279                 priv->oldlink = 0;
 280                 priv->speed = 0;
 281                 priv->oldduplex = -1;
 282         }
 283
 284         if (new_state && netif_msg_link(priv))
 285                 phy_print_status(phydev);
 286
 287         spin_unlock_irqrestore(&priv->lock, flags);
 288
 289         DBG(probe, DEBUG, "stmmac_adjust_link: exiting\n");
 290 }
 291
 292 /**
 293  * stmmac_init_phy - PHY initialization
 294  * @dev: net device structure
 295  * Description: it initializes the driver's PHY state, and attaches the PHY
 296  * to the mac driver.
 297  *  Return value:
 298  *  0 on success
 299  */
 300 static int stmmac_init_phy(struct net_device *dev)
 301 {
 302         struct stmmac_priv *priv = netdev_priv(dev);
 303         struct phy_device *phydev;
 304         char phy_id[MII_BUS_ID_SIZE + 3];
 305         char bus_id[MII_BUS_ID_SIZE];
 306         int interface = priv->plat->interface;
 307         priv->oldlink = 0;
 308         priv->speed = 0;
 309         priv->oldduplex = -1;
 310
 311         snprintf(bus_id, MII_BUS_ID_SIZE, "%x", priv->plat->bus_id);
 312         snprintf(phy_id, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
 313                  priv->plat->phy_addr);
 314         pr_debug("stmmac_init_phy:  trying to attach to %s\n", phy_id);
 315
 316         phydev = phy_connect(dev, phy_id, &stmmac_adjust_link, 0, interface);
 317
 318         if (IS_ERR(phydev)) {
 319                 pr_err("%s: Could not attach to PHY\n", dev->name);
 320                 return PTR_ERR(phydev);
 321         }
 322
 323         /* Stop Advertising 1000BASE Capability if interface is not GMII */
 324         if ((interface == PHY_INTERFACE_MODE_MII) ||
 325             (interface == PHY_INTERFACE_MODE_RMII))
 326                 phydev->advertising &= ~(SUPPORTED_1000baseT_Half |
 327                                          SUPPORTED_1000baseT_Full);
 328
 329         /*
 330          * Broken HW is sometimes missing the pull-up resistor on the
 331          * MDIO line, which results in reads to non-existent devices returning
 332          * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
 333          * device as well.
 334          * Note: phydev->phy_id is the result of reading the UID PHY registers.
 335          */
 336         if (phydev->phy_id == 0) {
 337                 phy_disconnect(phydev);
 338                 return -ENODEV;
 339         }
 340         pr_debug("stmmac_init_phy:  %s: attached to PHY (UID 0x%x)"
 341                  " Link = %d\n", dev->name, phydev->phy_id, phydev->link);
 342
 343         priv->phydev = phydev;
 344
 345         return 0;
 346 }
 347
 348 static inline void stmmac_enable_mac(void __iomem *ioaddr)
 349 {
 350         u32 value = readl(ioaddr + MAC_CTRL_REG);
 351
 352         value |= MAC_RNABLE_RX | MAC_ENABLE_TX;
 353         writel(value, ioaddr + MAC_CTRL_REG);
 354 }
 355
 356 static inline void stmmac_disable_mac(void __iomem *ioaddr)
 357 {
 358         u32 value = readl(ioaddr + MAC_CTRL_REG);
 359
 360         value &= ~(MAC_ENABLE_TX | MAC_RNABLE_RX);
 361         writel(value, ioaddr + MAC_CTRL_REG);
 362 }
 363
 364 /**
 365  * display_ring
 366  * @p: pointer to the ring.
 367  * @size: size of the ring.
 368  * Description: display all the descriptors within the ring.
 369  */
 370 static void display_ring(struct dma_desc *p, int size)
 371 {
 372         struct tmp_s {
 373                 u64 a;
 374                 unsigned int b;
 375                 unsigned int c;
 376         };
 377         int i;
 378         for (i = 0; i < size; i++) {
 379                 struct tmp_s *x = (struct tmp_s *)(p + i);
 380                 pr_info("\t%d [0x%x]: DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
 381                        i, (unsigned int)virt_to_phys(&p[i]),
 382                        (unsigned int)(x->a), (unsigned int)((x->a) >> 32),
 383                        x->b, x->c);
 384                 pr_info("\n");
 385         }
 386 }
 387
 388 static int stmmac_set_bfsize(int mtu, int bufsize)
 389 {
 390         int ret = bufsize;
 391
 392         if (mtu >= BUF_SIZE_4KiB)
 393                 ret = BUF_SIZE_8KiB;
 394         else if (mtu >= BUF_SIZE_2KiB)
 395                 ret = BUF_SIZE_4KiB;
 396         else if (mtu >= DMA_BUFFER_SIZE)
 397                 ret = BUF_SIZE_2KiB;
 398         else
 399                 ret = DMA_BUFFER_SIZE;
 400
 401         return ret;
 402 }
 403
 404 /**
 405  * init_dma_desc_rings - init the RX/TX descriptor rings
 406  * @dev: net device structure
 407  * Description:  this function initializes the DMA RX/TX descriptors
 408  * and allocates the socket buffers. It suppors the chained and ring
 409  * modes.
 410  */
 411 static void init_dma_desc_rings(struct net_device *dev)
 412 {
 413         int i;
 414         struct stmmac_priv *priv = netdev_priv(dev);
 415         struct sk_buff *skb;
 416         unsigned int txsize = priv->dma_tx_size;
 417         unsigned int rxsize = priv->dma_rx_size;
 418         unsigned int bfsize;
 419         int dis_ic = 0;
 420         int des3_as_data_buf = 0;
 421
 422         /* Set the max buffer size according to the DESC mode
 423          * and the MTU. Note that RING mode allows 16KiB bsize. */
 424         bfsize = priv->hw->ring->set_16kib_bfsize(dev->mtu);
 425
 426         if (bfsize == BUF_SIZE_16KiB)
 427                 des3_as_data_buf = 1;
 428         else
 429                 bfsize = stmmac_set_bfsize(dev->mtu, priv->dma_buf_sz);
 430
 431 #ifdef CONFIG_STMMAC_TIMER
 432         /* Disable interrupts on completion for the reception if timer is on */
 433         if (likely(priv->tm->enable))
 434                 dis_ic = 1;
 435 #endif
 436
 437         DBG(probe, INFO, "stmmac: txsize %d, rxsize %d, bfsize %d\n",
 438             txsize, rxsize, bfsize);
 439
 440         priv->rx_skbuff_dma = kmalloc(rxsize * sizeof(dma_addr_t), GFP_KERNEL);
 441         priv->rx_skbuff =
 442             kmalloc(sizeof(struct sk_buff *) * rxsize, GFP_KERNEL);
 443         priv->dma_rx =
 444             (struct dma_desc *)dma_alloc_coherent(priv->device,
 445                                                   rxsize *
 446                                                   sizeof(struct dma_desc),
 447                                                   &priv->dma_rx_phy,
 448                                                   GFP_KERNEL);
 449         priv->tx_skbuff = kmalloc(sizeof(struct sk_buff *) * txsize,
 450                                        GFP_KERNEL);
 451         priv->dma_tx =
 452             (struct dma_desc *)dma_alloc_coherent(priv->device,
 453                                                   txsize *
 454                                                   sizeof(struct dma_desc),
 455                                                   &priv->dma_tx_phy,
 456                                                   GFP_KERNEL);
 457
 458         if ((priv->dma_rx == NULL) || (priv->dma_tx == NULL)) {
 459                 pr_err("%s:ERROR allocating the DMA Tx/Rx desc\n", __func__);
 460                 return;
 461         }
 462
 463         DBG(probe, INFO, "stmmac (%s) DMA desc: virt addr (Rx %p, "
 464             "Tx %p)\n\tDMA phy addr (Rx 0x%08x, Tx 0x%08x)\n",
 465             dev->name, priv->dma_rx, priv->dma_tx,
 466             (unsigned int)priv->dma_rx_phy, (unsigned int)priv->dma_tx_phy);
 467
 468         /* RX INITIALIZATION */
 469         DBG(probe, INFO, "stmmac: SKB addresses:\n"
 470                          "skb\t\tskb data\tdma data\n");
 471
 472         for (i = 0; i < rxsize; i++) {
 473                 struct dma_desc *p = priv->dma_rx + i;
 474
 475                 skb = __netdev_alloc_skb(dev, bfsize + NET_IP_ALIGN,
 476                                          GFP_KERNEL);
 477                 if (unlikely(skb == NULL)) {
 478                         pr_err("%s: Rx init fails; skb is NULL\n", __func__);
 479                         break;
 480                 }
 481                 skb_reserve(skb, NET_IP_ALIGN);
 482                 priv->rx_skbuff[i] = skb;
 483                 priv->rx_skbuff_dma[i] = dma_map_single(priv->device, skb->data,
 484                                                 bfsize, DMA_FROM_DEVICE);
 485
 486                 p->des2 = priv->rx_skbuff_dma[i];
 487
 488                 priv->hw->ring->init_desc3(des3_as_data_buf, p);
 489
 490                 DBG(probe, INFO, "[%p]\t[%p]\t[%x]\n", priv->rx_skbuff[i],
 491                         priv->rx_skbuff[i]->data, priv->rx_skbuff_dma[i]);
 492         }
 493         priv->cur_rx = 0;
 494         priv->dirty_rx = (unsigned int)(i - rxsize);
 495         priv->dma_buf_sz = bfsize;
 496         buf_sz = bfsize;
 497
 498         /* TX INITIALIZATION */
 499         for (i = 0; i < txsize; i++) {
 500                 priv->tx_skbuff[i] = NULL;
 501                 priv->dma_tx[i].des2 = 0;
 502         }
 503
 504         /* In case of Chained mode this sets the des3 to the next
 505          * element in the chain */
 506         priv->hw->ring->init_dma_chain(priv->dma_rx, priv->dma_rx_phy, rxsize);
 507         priv->hw->ring->init_dma_chain(priv->dma_tx, priv->dma_tx_phy, txsize);
 508
 509         priv->dirty_tx = 0;
 510         priv->cur_tx = 0;
 511
 512         /* Clear the Rx/Tx descriptors */
 513         priv->hw->desc->init_rx_desc(priv->dma_rx, rxsize, dis_ic);
 514         priv->hw->desc->init_tx_desc(priv->dma_tx, txsize);
 515
 516         if (netif_msg_hw(priv)) {
 517                 pr_info("RX descriptor ring:\n");
 518                 display_ring(priv->dma_rx, rxsize);
 519                 pr_info("TX descriptor ring:\n");
 520                 display_ring(priv->dma_tx, txsize);
 521         }
 522 }
 523
 524 static void dma_free_rx_skbufs(struct stmmac_priv *priv)
 525 {
 526         int i;
 527
 528         for (i = 0; i < priv->dma_rx_size; i++) {
 529                 if (priv->rx_skbuff[i]) {
 530                         dma_unmap_single(priv->device, priv->rx_skbuff_dma[i],
 531                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
 532                         dev_kfree_skb_any(priv->rx_skbuff[i]);
 533                 }
 534                 priv->rx_skbuff[i] = NULL;
 535         }
 536 }
 537
 538 static void dma_free_tx_skbufs(struct stmmac_priv *priv)
 539 {
 540         int i;
 541
 542         for (i = 0; i < priv->dma_tx_size; i++) {
 543                 if (priv->tx_skbuff[i] != NULL) {
 544                         struct dma_desc *p = priv->dma_tx + i;
 545                         if (p->des2)
 546                                 dma_unmap_single(priv->device, p->des2,
 547                                                  priv->hw->desc->get_tx_len(p),
 548                                                  DMA_TO_DEVICE);
 549                         dev_kfree_skb_any(priv->tx_skbuff[i]);
 550                         priv->tx_skbuff[i] = NULL;
 551                 }
 552         }
 553 }
 554
 555 static void free_dma_desc_resources(struct stmmac_priv *priv)
 556 {
 557         /* Release the DMA TX/RX socket buffers */
 558         dma_free_rx_skbufs(priv);
 559         dma_free_tx_skbufs(priv);
 560
 561         /* Free the region of consistent memory previously allocated for
 562          * the DMA */
 563         dma_free_coherent(priv->device,
 564                           priv->dma_tx_size * sizeof(struct dma_desc),
 565                           priv->dma_tx, priv->dma_tx_phy);
 566         dma_free_coherent(priv->device,
 567                           priv->dma_rx_size * sizeof(struct dma_desc),
 568                           priv->dma_rx, priv->dma_rx_phy);
 569         kfree(priv->rx_skbuff_dma);
 570         kfree(priv->rx_skbuff);
 571         kfree(priv->tx_skbuff);
 572 }
 573
 574 /**
 575  *  stmmac_dma_operation_mode - HW DMA operation mode
 576  *  @priv : pointer to the private device structure.
 577  *  Description: it sets the DMA operation mode: tx/rx DMA thresholds
 578  *  or Store-And-Forward capability.
 579  */
 580 static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 581 {
 582         if (likely(priv->plat->force_sf_dma_mode ||
 583                 ((priv->plat->tx_coe) && (!priv->no_csum_insertion)))) {
 584                 /*
 585                  * In case of GMAC, SF mode can be enabled
 586                  * to perform the TX COE in HW. This depends on:
 587                  * 1) TX COE if actually supported
 588                  * 2) There is no bugged Jumbo frame support
 589                  *    that needs to not insert csum in the TDES.
 590                  */
 591                 priv->hw->dma->dma_mode(priv->ioaddr,
 592                                         SF_DMA_MODE, SF_DMA_MODE);
 593                 tc = SF_DMA_MODE;
 594         } else
 595                 priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 596 }
 597
 598 /**
 599  * stmmac_tx:
 600  * @priv: private driver structure
 601  * Description: it reclaims resources after transmission completes.
 602  */
 603 static void stmmac_tx(struct stmmac_priv *priv)
 604 {
 605         unsigned int txsize = priv->dma_tx_size;
 606
 607         spin_lock(&priv->tx_lock);
 608
 609         while (priv->dirty_tx != priv->cur_tx) {
 610                 int last;
 611                 unsigned int entry = priv->dirty_tx % txsize;
 612                 struct sk_buff *skb = priv->tx_skbuff[entry];
 613                 struct dma_desc *p = priv->dma_tx + entry;
 614
 615                 /* Check if the descriptor is owned by the DMA. */
 616                 if (priv->hw->desc->get_tx_owner(p))
 617                         break;
 618
 619                 /* Verify tx error by looking at the last segment */
 620                 last = priv->hw->desc->get_tx_ls(p);
 621                 if (likely(last)) {
 622                         int tx_error =
 623                                 priv->hw->desc->tx_status(&priv->dev->stats,
 624                                                           &priv->xstats, p,
 625                                                           priv->ioaddr);
 626                         if (likely(tx_error == 0)) {
 627                                 priv->dev->stats.tx_packets++;
 628                                 priv->xstats.tx_pkt_n++;
 629                         } else
 630                                 priv->dev->stats.tx_errors++;
 631                 }
 632                 TX_DBG("%s: curr %d, dirty %d\n", __func__,
 633                         priv->cur_tx, priv->dirty_tx);
 634
 635                 if (likely(p->des2))
 636                         dma_unmap_single(priv->device, p->des2,
 637                                          priv->hw->desc->get_tx_len(p),
 638                                          DMA_TO_DEVICE);
 639                 priv->hw->ring->clean_desc3(p);
 640
 641                 if (likely(skb != NULL)) {
 642                         /*
 643                          * If there's room in the queue (limit it to size)
 644                          * we add this skb back into the pool,
 645                          * if it's the right size.
 646                          */
 647                         if ((skb_queue_len(&priv->rx_recycle) <
 648                                 priv->dma_rx_size) &&
 649                                 skb_recycle_check(skb, priv->dma_buf_sz))
 650                                 __skb_queue_head(&priv->rx_recycle, skb);
 651                         else
 652                                 dev_kfree_skb(skb);
 653
 654                         priv->tx_skbuff[entry] = NULL;
 655                 }
 656
 657                 priv->hw->desc->release_tx_desc(p);
 658
 659                 entry = (++priv->dirty_tx) % txsize;
 660         }
 661         if (unlikely(netif_queue_stopped(priv->dev) &&
 662                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv))) {
 663                 netif_tx_lock(priv->dev);
 664                 if (netif_queue_stopped(priv->dev) &&
 665                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv)) {
 666                         TX_DBG("%s: restart transmit\n", __func__);
 667                         netif_wake_queue(priv->dev);
 668                 }
 669                 netif_tx_unlock(priv->dev);
 670         }
 671         spin_unlock(&priv->tx_lock);
 672 }
 673
 674 static inline void stmmac_enable_irq(struct stmmac_priv *priv)
 675 {
 676 #ifdef CONFIG_STMMAC_TIMER
 677         if (likely(priv->tm->enable))
 678                 priv->tm->timer_start(tmrate);
 679         else
 680 #endif
 681                 priv->hw->dma->enable_dma_irq(priv->ioaddr);
 682 }
 683
 684 static inline void stmmac_disable_irq(struct stmmac_priv *priv)
 685 {
 686 #ifdef CONFIG_STMMAC_TIMER
 687         if (likely(priv->tm->enable))
 688                 priv->tm->timer_stop();
 689         else
 690 #endif
 691                 priv->hw->dma->disable_dma_irq(priv->ioaddr);
 692 }
 693
 694 static int stmmac_has_work(struct stmmac_priv *priv)
 695 {
 696         unsigned int has_work = 0;
 697         int rxret, tx_work = 0;
 698
 699         rxret = priv->hw->desc->get_rx_owner(priv->dma_rx +
 700                 (priv->cur_rx % priv->dma_rx_size));
 701
 702         if (priv->dirty_tx != priv->cur_tx)
 703                 tx_work = 1;
 704
 705         if (likely(!rxret || tx_work))
 706                 has_work = 1;
 707
 708         return has_work;
 709 }
 710
 711 static inline void _stmmac_schedule(struct stmmac_priv *priv)
 712 {
 713         if (likely(stmmac_has_work(priv))) {
 714                 stmmac_disable_irq(priv);
 715                 napi_schedule(&priv->napi);
 716         }
 717 }
 718
 719 #ifdef CONFIG_STMMAC_TIMER
 720 void stmmac_schedule(struct net_device *dev)
 721 {
 722         struct stmmac_priv *priv = netdev_priv(dev);
 723
 724         priv->xstats.sched_timer_n++;
 725
 726         _stmmac_schedule(priv);
 727 }
 728
 729 static void stmmac_no_timer_started(unsigned int x)
 730 {;
 731 };
 732
 733 static void stmmac_no_timer_stopped(void)
 734 {;
 735 };
 736 #endif
 737
 738 /**
 739  * stmmac_tx_err:
 740  * @priv: pointer to the private device structure
 741  * Description: it cleans the descriptors and restarts the transmission
 742  * in case of errors.
 743  */
 744 static void stmmac_tx_err(struct stmmac_priv *priv)
 745 {
 746         netif_stop_queue(priv->dev);
 747
 748         priv->hw->dma->stop_tx(priv->ioaddr);
 749         dma_free_tx_skbufs(priv);
 750         priv->hw->desc->init_tx_desc(priv->dma_tx, priv->dma_tx_size);
 751         priv->dirty_tx = 0;
 752         priv->cur_tx = 0;
 753         priv->hw->dma->start_tx(priv->ioaddr);
 754
 755         priv->dev->stats.tx_errors++;
 756         netif_wake_queue(priv->dev);
 757 }
 758
 759
 760 static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 761 {
 762         int status;
 763
 764         status = priv->hw->dma->dma_interrupt(priv->ioaddr, &priv->xstats);
 765         if (likely(status == handle_tx_rx))
 766                 _stmmac_schedule(priv);
 767
 768         else if (unlikely(status == tx_hard_error_bump_tc)) {
 769                 /* Try to bump up the dma threshold on this failure */
 770                 if (unlikely(tc != SF_DMA_MODE) && (tc <= 256)) {
 771                         tc += 64;
 772                         priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 773                         priv->xstats.threshold = tc;
 774                 }
 775         } else if (unlikely(status == tx_hard_error))
 776                 stmmac_tx_err(priv);
 777 }
 778
 779 static void stmmac_mmc_setup(struct stmmac_priv *priv)
 780 {
 781         unsigned int mode = MMC_CNTRL_RESET_ON_READ | MMC_CNTRL_COUNTER_RESET |
 782                             MMC_CNTRL_PRESET | MMC_CNTRL_FULL_HALF_PRESET;
 783
 784         /* Do not manage MMC IRQ (FIXME) */
 785         dwmac_mmc_intr_all_mask(priv->ioaddr);
 786         dwmac_mmc_ctrl(priv->ioaddr, mode);
 787         memset(&priv->mmc, 0, sizeof(struct stmmac_counters));
 788 }
 789
 790 static u32 stmmac_get_synopsys_id(struct stmmac_priv *priv)
 791 {
 792         u32 hwid = priv->hw->synopsys_uid;
 793
 794         /* Only check valid Synopsys Id because old MAC chips
 795          * have no HW registers where get the ID */
 796         if (likely(hwid)) {
 797                 u32 uid = ((hwid & 0x0000ff00) >> 8);
 798                 u32 synid = (hwid & 0x000000ff);
 799
 800                 pr_info("STMMAC - user ID: 0x%x, Synopsys ID: 0x%x\n",
 801                         uid, synid);
 802
 803                 return synid;
 804         }
 805         return 0;
 806 }
 807
 808 /**
 809  * stmmac_selec_desc_mode
 810  * @dev : device pointer
 811  * Description: select the Enhanced/Alternate or Normal descriptors */
 812 static void stmmac_selec_desc_mode(struct stmmac_priv *priv)
 813 {
 814         if (priv->plat->enh_desc) {
 815                 pr_info(" Enhanced/Alternate descriptors\n");
 816                 priv->hw->desc = &enh_desc_ops;
 817         } else {
 818                 pr_info(" Normal descriptors\n");
 819                 priv->hw->desc = &ndesc_ops;
 820         }
 821 }
 822
 823 /**
 824  * stmmac_get_hw_features
 825  * @priv : private device pointer
 826  * Description:
 827  *  new GMAC chip generations have a new register to indicate the
 828  *  presence of the optional feature/functions.
 829  *  This can be also used to override the value passed through the
 830  *  platform and necessary for old MAC10/100 and GMAC chips.
 831  */
 832 static int stmmac_get_hw_features(struct stmmac_priv *priv)
 833 {
 834         u32 hw_cap = 0;
 835
 836         if (priv->hw->dma->get_hw_feature) {
 837                 hw_cap = priv->hw->dma->get_hw_feature(priv->ioaddr);
 838
 839                 priv->dma_cap.mbps_10_100 = (hw_cap & DMA_HW_FEAT_MIISEL);
 840                 priv->dma_cap.mbps_1000 = (hw_cap & DMA_HW_FEAT_GMIISEL) >> 1;
 841                 priv->dma_cap.half_duplex = (hw_cap & DMA_HW_FEAT_HDSEL) >> 2;
 842                 priv->dma_cap.hash_filter = (hw_cap & DMA_HW_FEAT_HASHSEL) >> 4;
 843                 priv->dma_cap.multi_addr =
 844                         (hw_cap & DMA_HW_FEAT_ADDMACADRSEL) >> 5;
 845                 priv->dma_cap.pcs = (hw_cap & DMA_HW_FEAT_PCSSEL) >> 6;
 846                 priv->dma_cap.sma_mdio = (hw_cap & DMA_HW_FEAT_SMASEL) >> 8;
 847                 priv->dma_cap.pmt_remote_wake_up =
 848                         (hw_cap & DMA_HW_FEAT_RWKSEL) >> 9;
 849                 priv->dma_cap.pmt_magic_frame =
 850                         (hw_cap & DMA_HW_FEAT_MGKSEL) >> 10;
 851                 /* MMC */
 852                 priv->dma_cap.rmon = (hw_cap & DMA_HW_FEAT_MMCSEL) >> 11;
 853                 /* IEEE 1588-2002*/
 854                 priv->dma_cap.time_stamp =
 855                         (hw_cap & DMA_HW_FEAT_TSVER1SEL) >> 12;
 856                 /* IEEE 1588-2008*/
 857                 priv->dma_cap.atime_stamp =
 858                         (hw_cap & DMA_HW_FEAT_TSVER2SEL) >> 13;
 859                 /* 802.3az - Energy-Efficient Ethernet (EEE) */
 860                 priv->dma_cap.eee = (hw_cap & DMA_HW_FEAT_EEESEL) >> 14;
 861                 priv->dma_cap.av = (hw_cap & DMA_HW_FEAT_AVSEL) >> 15;
 862                 /* TX and RX csum */
 863                 priv->dma_cap.tx_coe = (hw_cap & DMA_HW_FEAT_TXCOESEL) >> 16;
 864                 priv->dma_cap.rx_coe_type1 =
 865                         (hw_cap & DMA_HW_FEAT_RXTYP1COE) >> 17;
 866                 priv->dma_cap.rx_coe_type2 =
 867                         (hw_cap & DMA_HW_FEAT_RXTYP2COE) >> 18;
 868                 priv->dma_cap.rxfifo_over_2048 =
 869                         (hw_cap & DMA_HW_FEAT_RXFIFOSIZE) >> 19;
 870                 /* TX and RX number of channels */
 871                 priv->dma_cap.number_rx_channel =
 872                         (hw_cap & DMA_HW_FEAT_RXCHCNT) >> 20;
 873                 priv->dma_cap.number_tx_channel =
 874                         (hw_cap & DMA_HW_FEAT_TXCHCNT) >> 22;
 875                 /* Alternate (enhanced) DESC mode*/
 876                 priv->dma_cap.enh_desc =
 877                         (hw_cap & DMA_HW_FEAT_ENHDESSEL) >> 24;
 878
 879         }
 880
 881         return hw_cap;
 882 }
 883
 884 /**
 885  *  stmmac_open - open entry point of the driver
 886  *  @dev : pointer to the device structure.
 887  *  Description:
 888  *  This function is the open entry point of the driver.
 889  *  Return value:
 890  *  0 on success and an appropriate (-)ve integer as defined in errno.h
 891  *  file on failure.
 892  */
 893 static int stmmac_open(struct net_device *dev)
 894 {
 895         struct stmmac_priv *priv = netdev_priv(dev);
 896         int ret;
 897
 898         /* Check that the MAC address is valid.  If its not, refuse
 899          * to bring the device up. The user must specify an
 900          * address using the following linux command:
 901          *      ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx  */
 902         if (!is_valid_ether_addr(dev->dev_addr)) {
 903                 random_ether_addr(dev->dev_addr);
 904                 pr_warning("%s: generated random MAC address %pM\n", dev->name,
 905                         dev->dev_addr);
 906         }
 907
 908         stmmac_verify_args();
 909
 910 #ifdef CONFIG_STMMAC_TIMER
 911         priv->tm = kzalloc(sizeof(struct stmmac_timer *), GFP_KERNEL);
 912         if (unlikely(priv->tm == NULL)) {
 913                 pr_err("%s: ERROR: timer memory alloc failed\n", __func__);
 914                 return -ENOMEM;
 915         }
 916         priv->tm->freq = tmrate;
 917
 918         /* Test if the external timer can be actually used.
 919          * In case of failure continue without timer. */
 920         if (unlikely((stmmac_open_ext_timer(dev, priv->tm)) < 0)) {
 921                 pr_warning("stmmaceth: cannot attach the external timer.\n");
 922                 priv->tm->freq = 0;
 923                 priv->tm->timer_start = stmmac_no_timer_started;
 924                 priv->tm->timer_stop = stmmac_no_timer_stopped;
 925         } else
 926                 priv->tm->enable = 1;
 927 #endif
 928         ret = stmmac_init_phy(dev);
 929         if (unlikely(ret)) {
 930                 pr_err("%s: Cannot attach to PHY (error: %d)\n", __func__, ret);
 931                 goto open_error;
 932         }
 933
 934         stmmac_get_synopsys_id(priv);
 935
 936         priv->hw_cap_support = stmmac_get_hw_features(priv);
 937
 938         if (priv->hw_cap_support) {
 939                 pr_info(" Support DMA HW capability register");
 940
 941                 /* We can override some gmac/dma configuration fields: e.g.
 942                  * enh_desc, tx_coe (e.g. that are passed through the
 943                  * platform) with the values from the HW capability
 944                  * register (if supported).
 945                  */
 946                 priv->plat->enh_desc = priv->dma_cap.enh_desc;
 947                 priv->plat->tx_coe = priv->dma_cap.tx_coe;
 948                 priv->plat->pmt = priv->dma_cap.pmt_remote_wake_up;
 949
 950                 /* By default disable wol on magic frame if not supported */
 951                 if (!priv->dma_cap.pmt_magic_frame)
 952                         priv->wolopts &= ~WAKE_MAGIC;
 953
 954         } else
 955                 pr_info(" No HW DMA feature register supported");
 956
 957         /* Select the enhnaced/normal descriptor structures */
 958         stmmac_selec_desc_mode(priv);
 959
 960         /* PMT module is not integrated in all the MAC devices. */
 961         if (priv->plat->pmt) {
 962                 pr_info(" Remote wake-up capable\n");
 963                 device_set_wakeup_capable(priv->device, 1);
 964         }
 965
 966         priv->rx_coe = priv->hw->mac->rx_coe(priv->ioaddr);
 967         if (priv->rx_coe)
 968                 pr_info(" Checksum Offload Engine supported\n");
 969         if (priv->plat->tx_coe)
 970                 pr_info(" Checksum insertion supported\n");
 971
 972         /* Create and initialize the TX/RX descriptors chains. */
 973         priv->dma_tx_size = STMMAC_ALIGN(dma_txsize);
 974         priv->dma_rx_size = STMMAC_ALIGN(dma_rxsize);
 975         priv->dma_buf_sz = STMMAC_ALIGN(buf_sz);
 976         init_dma_desc_rings(dev);
 977
 978         /* DMA initialization and SW reset */
 979         ret = priv->hw->dma->init(priv->ioaddr, priv->plat->pbl,
 980                                   priv->dma_tx_phy, priv->dma_rx_phy);
 981         if (ret < 0) {
 982                 pr_err("%s: DMA initialization failed\n", __func__);
 983                 goto open_error;
 984         }
 985
 986         /* Copy the MAC addr into the HW  */
 987         priv->hw->mac->set_umac_addr(priv->ioaddr, dev->dev_addr, 0);
 988         /* If required, perform hw setup of the bus. */
 989         if (priv->plat->bus_setup)
 990                 priv->plat->bus_setup(priv->ioaddr);
 991         /* Initialize the MAC Core */
 992         priv->hw->mac->core_init(priv->ioaddr);
 993
 994         netdev_update_features(dev);
 995
 996         /* Request the IRQ lines */
 997         ret = request_irq(dev->irq, stmmac_interrupt,
 998                          IRQF_SHARED, dev->name, dev);
 999         if (unlikely(ret < 0)) {
1000                 pr_err("%s: ERROR: allocating the IRQ %d (error: %d)\n",
1001                        __func__, dev->irq, ret);
1002                 goto open_error;
1003         }
1004
1005         /* Enable the MAC Rx/Tx */
1006         stmmac_enable_mac(priv->ioaddr);
1007
1008         /* Set the HW DMA mode and the COE */
1009         stmmac_dma_operation_mode(priv);
1010
1011         /* Extra statistics */
1012         memset(&priv->xstats, 0, sizeof(struct stmmac_extra_stats));
1013         priv->xstats.threshold = tc;
1014
1015         if (priv->dma_cap.rmon)
1016                 stmmac_mmc_setup(priv);
1017
1018         /* Start the ball rolling... */
1019         DBG(probe, DEBUG, "%s: DMA RX/TX processes started...\n", dev->name);
1020         priv->hw->dma->start_tx(priv->ioaddr);
1021         priv->hw->dma->start_rx(priv->ioaddr);
1022
1023 #ifdef CONFIG_STMMAC_TIMER
1024         priv->tm->timer_start(tmrate);
1025 #endif
1026         /* Dump DMA/MAC registers */
1027         if (netif_msg_hw(priv)) {
1028                 priv->hw->mac->dump_regs(priv->ioaddr);
1029                 priv->hw->dma->dump_regs(priv->ioaddr);
1030         }
1031
1032         if (priv->phydev)
1033                 phy_start(priv->phydev);
1034
1035         napi_enable(&priv->napi);
1036         skb_queue_head_init(&priv->rx_recycle);
1037         netif_start_queue(dev);
1038
1039         return 0;
1040
1041 open_error:
1042 #ifdef CONFIG_STMMAC_TIMER
1043         kfree(priv->tm);
1044 #endif
1045         if (priv->phydev)
1046                 phy_disconnect(priv->phydev);
1047
1048         return ret;
1049 }
1050
1051 /**
1052  *  stmmac_release - close entry point of the driver
1053  *  @dev : device pointer.
1054  *  Description:
1055  *  This is the stop entry point of the driver.
1056  */
1057 static int stmmac_release(struct net_device *dev)
1058 {
1059         struct stmmac_priv *priv = netdev_priv(dev);
1060
1061         /* Stop and disconnect the PHY */
1062         if (priv->phydev) {
1063                 phy_stop(priv->phydev);
1064                 phy_disconnect(priv->phydev);
1065                 priv->phydev = NULL;
1066         }
1067
1068         netif_stop_queue(dev);
1069
1070 #ifdef CONFIG_STMMAC_TIMER
1071         /* Stop and release the timer */
1072         stmmac_close_ext_timer();
1073         if (priv->tm != NULL)
1074                 kfree(priv->tm);
1075 #endif
1076         napi_disable(&priv->napi);
1077         skb_queue_purge(&priv->rx_recycle);
1078
1079         /* Free the IRQ lines */
1080         free_irq(dev->irq, dev);
1081
1082         /* Stop TX/RX DMA and clear the descriptors */
1083         priv->hw->dma->stop_tx(priv->ioaddr);
1084         priv->hw->dma->stop_rx(priv->ioaddr);
1085
1086         /* Release and free the Rx/Tx resources */
1087         free_dma_desc_resources(priv);
1088
1089         /* Disable the MAC Rx/Tx */
1090         stmmac_disable_mac(priv->ioaddr);
1091
1092         netif_carrier_off(dev);
1093
1094         return 0;
1095 }
1096
1097 /**
1098  *  stmmac_xmit:
1099  *  @skb : the socket buffer
1100  *  @dev : device pointer
1101  *  Description : Tx entry point of the driver.
1102  */
1103 static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
1104 {
1105         struct stmmac_priv *priv = netdev_priv(dev);
1106         unsigned int txsize = priv->dma_tx_size;
1107         unsigned int entry;
1108         int i, csum_insertion = 0;
1109         int nfrags = skb_shinfo(skb)->nr_frags;
1110         struct dma_desc *desc, *first;
1111         unsigned int nopaged_len = skb_headlen(skb);
1112
1113         if (unlikely(stmmac_tx_avail(priv) < nfrags + 1)) {
1114                 if (!netif_queue_stopped(dev)) {
1115                         netif_stop_queue(dev);
1116                         /* This is a hard error, log it. */
1117                         pr_err("%s: BUG! Tx Ring full when queue awake\n",
1118                                 __func__);
1119                 }
1120                 return NETDEV_TX_BUSY;
1121         }
1122
1123         spin_lock(&priv->tx_lock);
1124
1125         entry = priv->cur_tx % txsize;
1126
1127 #ifdef STMMAC_XMIT_DEBUG
1128         if ((skb->len > ETH_FRAME_LEN) || nfrags)
1129                 pr_info("stmmac xmit:\n"
1130                        "\tskb addr %p - len: %d - nopaged_len: %d\n"
1131                        "\tn_frags: %d - ip_summed: %d - %s gso\n",
1132                        skb, skb->len, nopaged_len, nfrags, skb->ip_summed,
1133                        !skb_is_gso(skb) ? "isn't" : "is");
1134 #endif
1135
1136         csum_insertion = (skb->ip_summed == CHECKSUM_PARTIAL);
1137
1138         desc = priv->dma_tx + entry;
1139         first = desc;
1140
1141 #ifdef STMMAC_XMIT_DEBUG
1142         if ((nfrags > 0) || (skb->len > ETH_FRAME_LEN))
1143                 pr_debug("stmmac xmit: skb len: %d, nopaged_len: %d,\n"
1144                        "\t\tn_frags: %d, ip_summed: %d\n",
1145                        skb->len, nopaged_len, nfrags, skb->ip_summed);
1146 #endif
1147         priv->tx_skbuff[entry] = skb;
1148
1149         if (priv->hw->ring->is_jumbo_frm(skb->len, priv->plat->enh_desc)) {
1150                 entry = priv->hw->ring->jumbo_frm(priv, skb, csum_insertion);
1151                 desc = priv->dma_tx + entry;
1152         } else {
1153                 desc->des2 = dma_map_single(priv->device, skb->data,
1154                                         nopaged_len, DMA_TO_DEVICE);
1155                 priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
1156                                                 csum_insertion);
1157         }
1158
1159         for (i = 0; i < nfrags; i++) {
1160                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1161                 int len = skb_frag_size(frag);
1162
1163                 entry = (++priv->cur_tx) % txsize;
1164                 desc = priv->dma_tx + entry;
1165
1166                 TX_DBG("\t[entry %d] segment len: %d\n", entry, len);
1167                 desc->des2 = skb_frag_dma_map(priv->device, frag, 0, len,
1168                                               DMA_TO_DEVICE);
1169                 priv->tx_skbuff[entry] = NULL;
1170                 priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion);
1171                 wmb();
1172                 priv->hw->desc->set_tx_owner(desc);
1173         }
1174
1175         /* Interrupt on completition only for the latest segment */
1176         priv->hw->desc->close_tx_desc(desc);
1177
1178 #ifdef CONFIG_STMMAC_TIMER
1179         /* Clean IC while using timer */
1180         if (likely(priv->tm->enable))
1181                 priv->hw->desc->clear_tx_ic(desc);
1182 #endif
1183
1184         wmb();
1185
1186         /* To avoid raise condition */
1187         priv->hw->desc->set_tx_owner(first);
1188
1189         priv->cur_tx++;
1190
1191 #ifdef STMMAC_XMIT_DEBUG
1192         if (netif_msg_pktdata(priv)) {
1193                 pr_info("stmmac xmit: current=%d, dirty=%d, entry=%d, "
1194                        "first=%p, nfrags=%d\n",
1195                        (priv->cur_tx % txsize), (priv->dirty_tx % txsize),
1196                        entry, first, nfrags);
1197                 display_ring(priv->dma_tx, txsize);
1198                 pr_info(">>> frame to be transmitted: ");
1199                 print_pkt(skb->data, skb->len);
1200         }
1201 #endif
1202         if (unlikely(stmmac_tx_avail(priv) <= (MAX_SKB_FRAGS + 1))) {
1203                 TX_DBG("%s: stop transmitted packets\n", __func__);
1204                 netif_stop_queue(dev);
1205         }
1206
1207         dev->stats.tx_bytes += skb->len;
1208
1209         skb_tx_timestamp(skb);
1210
1211         priv->hw->dma->enable_dma_transmission(priv->ioaddr);
1212
1213         spin_unlock(&priv->tx_lock);
1214
1215         return NETDEV_TX_OK;
1216 }
1217
1218 static inline void stmmac_rx_refill(struct stmmac_priv *priv)
1219 {
1220         unsigned int rxsize = priv->dma_rx_size;
1221         int bfsize = priv->dma_buf_sz;
1222         struct dma_desc *p = priv->dma_rx;
1223
1224         for (; priv->cur_rx - priv->dirty_rx > 0; priv->dirty_rx++) {
1225                 unsigned int entry = priv->dirty_rx % rxsize;
1226                 if (likely(priv->rx_skbuff[entry] == NULL)) {
1227                         struct sk_buff *skb;
1228
1229                         skb = __skb_dequeue(&priv->rx_recycle);
1230                         if (skb == NULL)
1231                                 skb = netdev_alloc_skb_ip_align(priv->dev,
1232                                                                 bfsize);
1233
1234                         if (unlikely(skb == NULL))
1235                                 break;
1236
1237                         priv->rx_skbuff[entry] = skb;
1238                         priv->rx_skbuff_dma[entry] =
1239                             dma_map_single(priv->device, skb->data, bfsize,
1240                                            DMA_FROM_DEVICE);
1241
1242                         (p + entry)->des2 = priv->rx_skbuff_dma[entry];
1243
1244                         if (unlikely(priv->plat->has_gmac))
1245                                 priv->hw->ring->refill_desc3(bfsize, p + entry);
1246
1247                         RX_DBG(KERN_INFO "\trefill entry #%d\n", entry);
1248                 }
1249                 wmb();
1250                 priv->hw->desc->set_rx_owner(p + entry);
1251         }
1252 }
1253
1254 static int stmmac_rx(struct stmmac_priv *priv, int limit)
1255 {
1256         unsigned int rxsize = priv->dma_rx_size;
1257         unsigned int entry = priv->cur_rx % rxsize;
1258         unsigned int next_entry;
1259         unsigned int count = 0;
1260         struct dma_desc *p = priv->dma_rx + entry;
1261         struct dma_desc *p_next;
1262
1263 #ifdef STMMAC_RX_DEBUG
1264         if (netif_msg_hw(priv)) {
1265                 pr_debug(">>> stmmac_rx: descriptor ring:\n");
1266                 display_ring(priv->dma_rx, rxsize);
1267         }
1268 #endif
1269         count = 0;
1270         while (!priv->hw->desc->get_rx_owner(p)) {
1271                 int status;
1272
1273                 if (count >= limit)
1274                         break;
1275
1276                 count++;
1277
1278                 next_entry = (++priv->cur_rx) % rxsize;
1279                 p_next = priv->dma_rx + next_entry;
1280                 prefetch(p_next);
1281
1282                 /* read the status of the incoming frame */
1283                 status = (priv->hw->desc->rx_status(&priv->dev->stats,
1284                                                     &priv->xstats, p));
1285                 if (unlikely(status == discard_frame))
1286                         priv->dev->stats.rx_errors++;
1287                 else {
1288                         struct sk_buff *skb;
1289                         int frame_len;
1290
1291                         frame_len = priv->hw->desc->get_rx_frame_len(p);
1292                         /* ACS is set; GMAC core strips PAD/FCS for IEEE 802.3
1293                          * Type frames (LLC/LLC-SNAP) */
1294                         if (unlikely(status != llc_snap))
1295                                 frame_len -= ETH_FCS_LEN;
1296 #ifdef STMMAC_RX_DEBUG
1297                         if (frame_len > ETH_FRAME_LEN)
1298                                 pr_debug("\tRX frame size %d, COE status: %d\n",
1299                                         frame_len, status);
1300
1301                         if (netif_msg_hw(priv))
1302                                 pr_debug("\tdesc: %p [entry %d] buff=0x%x\n",
1303                                         p, entry, p->des2);
1304 #endif
1305                         skb = priv->rx_skbuff[entry];
1306                         if (unlikely(!skb)) {
1307                                 pr_err("%s: Inconsistent Rx descriptor chain\n",
1308                                         priv->dev->name);
1309                                 priv->dev->stats.rx_dropped++;
1310                                 break;
1311                         }
1312                         prefetch(skb->data - NET_IP_ALIGN);
1313                         priv->rx_skbuff[entry] = NULL;
1314
1315                         skb_put(skb, frame_len);
1316                         dma_unmap_single(priv->device,
1317                                          priv->rx_skbuff_dma[entry],
1318                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
1319 #ifdef STMMAC_RX_DEBUG
1320                         if (netif_msg_pktdata(priv)) {
1321                                 pr_info(" frame received (%dbytes)", frame_len);
1322                                 print_pkt(skb->data, frame_len);
1323                         }
1324 #endif
1325                         skb->protocol = eth_type_trans(skb, priv->dev);
1326
1327                         if (unlikely(!priv->rx_coe)) {
1328                                 /* No RX COE for old mac10/100 devices */
1329                                 skb_checksum_none_assert(skb);
1330                                 netif_receive_skb(skb);
1331                         } else {
1332                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1333                                 napi_gro_receive(&priv->napi, skb);
1334                         }
1335
1336                         priv->dev->stats.rx_packets++;
1337                         priv->dev->stats.rx_bytes += frame_len;
1338                 }
1339                 entry = next_entry;
1340                 p = p_next;     /* use prefetched values */
1341         }
1342
1343         stmmac_rx_refill(priv);
1344
1345         priv->xstats.rx_pkt_n += count;
1346
1347         return count;
1348 }
1349
1350 /**
1351  *  stmmac_poll - stmmac poll method (NAPI)
1352  *  @napi : pointer to the napi structure.
1353  *  @budget : maximum number of packets that the current CPU can receive from
1354  *            all interfaces.
1355  *  Description :
1356  *   This function implements the the reception process.
1357  *   Also it runs the TX completion thread
1358  */
1359 static int stmmac_poll(struct napi_struct *napi, int budget)
1360 {
1361         struct stmmac_priv *priv = container_of(napi, struct stmmac_priv, napi);
1362         int work_done = 0;
1363
1364         priv->xstats.poll_n++;
1365         stmmac_tx(priv);
1366         work_done = stmmac_rx(priv, budget);
1367
1368         if (work_done < budget) {
1369                 napi_complete(napi);
1370                 stmmac_enable_irq(priv);
1371         }
1372         return work_done;
1373 }
1374
1375 /**
1376  *  stmmac_tx_timeout
1377  *  @dev : Pointer to net device structure
1378  *  Description: this function is called when a packet transmission fails to
1379  *   complete within a reasonable tmrate. The driver will mark the error in the
1380  *   netdev structure and arrange for the device to be reset to a sane state
1381  *   in order to transmit a new packet.
1382  */
1383 static void stmmac_tx_timeout(struct net_device *dev)
1384 {
1385         struct stmmac_priv *priv = netdev_priv(dev);
1386
1387         /* Clear Tx resources and restart transmitting again */
1388         stmmac_tx_err(priv);
1389 }
1390
1391 /* Configuration changes (passed on by ifconfig) */
1392 static int stmmac_config(struct net_device *dev, struct ifmap *map)
1393 {
1394         if (dev->flags & IFF_UP)        /* can't act on a running interface */
1395                 return -EBUSY;
1396
1397         /* Don't allow changing the I/O address */
1398         if (map->base_addr != dev->base_addr) {
1399                 pr_warning("%s: can't change I/O address\n", dev->name);
1400                 return -EOPNOTSUPP;
1401         }
1402
1403         /* Don't allow changing the IRQ */
1404         if (map->irq != dev->irq) {
1405                 pr_warning("%s: can't change IRQ number %d\n",
1406                        dev->name, dev->irq);
1407                 return -EOPNOTSUPP;
1408         }
1409
1410         /* ignore other fields */
1411         return 0;
1412 }
1413
1414 /**
1415  *  stmmac_set_rx_mode - entry point for multicast addressing
1416  *  @dev : pointer to the device structure
1417  *  Description:
1418  *  This function is a driver entry point which gets called by the kernel
1419  *  whenever multicast addresses must be enabled/disabled.
1420  *  Return value:
1421  *  void.
1422  */
1423 static void stmmac_set_rx_mode(struct net_device *dev)
1424 {
1425         struct stmmac_priv *priv = netdev_priv(dev);
1426
1427         spin_lock(&priv->lock);
1428         priv->hw->mac->set_filter(dev);
1429         spin_unlock(&priv->lock);
1430 }
1431
1432 /**
1433  *  stmmac_change_mtu - entry point to change MTU size for the device.
1434  *  @dev : device pointer.
1435  *  @new_mtu : the new MTU size for the device.
1436  *  Description: the Maximum Transfer Unit (MTU) is used by the network layer
1437  *  to drive packet transmission. Ethernet has an MTU of 1500 octets
1438  *  (ETH_DATA_LEN). This value can be changed with ifconfig.
1439  *  Return value:
1440  *  0 on success and an appropriate (-)ve integer as defined in errno.h
1441  *  file on failure.
1442  */
1443 static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
1444 {
1445         struct stmmac_priv *priv = netdev_priv(dev);
1446         int max_mtu;
1447
1448         if (netif_running(dev)) {
1449                 pr_err("%s: must be stopped to change its MTU\n", dev->name);
1450                 return -EBUSY;
1451         }
1452
1453         if (priv->plat->enh_desc)
1454                 max_mtu = JUMBO_LEN;
1455         else
1456                 max_mtu = SKB_MAX_HEAD(NET_SKB_PAD + NET_IP_ALIGN);
1457
1458         if ((new_mtu < 46) || (new_mtu > max_mtu)) {
1459                 pr_err("%s: invalid MTU, max MTU is: %d\n", dev->name, max_mtu);
1460                 return -EINVAL;
1461         }
1462
1463         dev->mtu = new_mtu;
1464         netdev_update_features(dev);
1465
1466         return 0;
1467 }
1468
1469 static netdev_features_t stmmac_fix_features(struct net_device *dev,
1470         netdev_features_t features)
1471 {
1472         struct stmmac_priv *priv = netdev_priv(dev);
1473
1474         if (!priv->rx_coe)
1475                 features &= ~NETIF_F_RXCSUM;
1476         if (!priv->plat->tx_coe)
1477                 features &= ~NETIF_F_ALL_CSUM;
1478
1479         /* Some GMAC devices have a bugged Jumbo frame support that
1480          * needs to have the Tx COE disabled for oversized frames
1481          * (due to limited buffer sizes). In this case we disable
1482          * the TX csum insertionin the TDES and not use SF. */
1483         if (priv->plat->bugged_jumbo && (dev->mtu > ETH_DATA_LEN))
1484                 features &= ~NETIF_F_ALL_CSUM;
1485
1486         return features;
1487 }
1488
1489 static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
1490 {
1491         struct net_device *dev = (struct net_device *)dev_id;
1492         struct stmmac_priv *priv = netdev_priv(dev);
1493
1494         if (unlikely(!dev)) {
1495                 pr_err("%s: invalid dev pointer\n", __func__);
1496                 return IRQ_NONE;
1497         }
1498
1499         if (priv->plat->has_gmac)
1500                 /* To handle GMAC own interrupts */
1501                 priv->hw->mac->host_irq_status((void __iomem *) dev->base_addr);
1502
1503         stmmac_dma_interrupt(priv);
1504
1505         return IRQ_HANDLED;
1506 }
1507
1508 #ifdef CONFIG_NET_POLL_CONTROLLER
1509 /* Polling receive - used by NETCONSOLE and other diagnostic tools
1510  * to allow network I/O with interrupts disabled. */
1511 static void stmmac_poll_controller(struct net_device *dev)
1512 {
1513         disable_irq(dev->irq);
1514         stmmac_interrupt(dev->irq, dev);
1515         enable_irq(dev->irq);
1516 }
1517 #endif
1518
1519 /**
1520  *  stmmac_ioctl - Entry point for the Ioctl
1521  *  @dev: Device pointer.
1522  *  @rq: An IOCTL specefic structure, that can contain a pointer to
1523  *  a proprietary structure used to pass information to the driver.
1524  *  @cmd: IOCTL command
1525  *  Description:
1526  *  Currently there are no special functionality supported in IOCTL, just the
1527  *  phy_mii_ioctl(...) can be invoked.
1528  */
1529 static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1530 {
1531         struct stmmac_priv *priv = netdev_priv(dev);
1532         int ret;
1533
1534         if (!netif_running(dev))
1535                 return -EINVAL;
1536
1537         if (!priv->phydev)
1538                 return -EINVAL;
1539
1540         ret = phy_mii_ioctl(priv->phydev, rq, cmd);
1541
1542         return ret;
1543 }
1544
1545 #ifdef CONFIG_STMMAC_DEBUG_FS
1546 static struct dentry *stmmac_fs_dir;
1547 static struct dentry *stmmac_rings_status;
1548 static struct dentry *stmmac_dma_cap;
1549
1550 static int stmmac_sysfs_ring_read(struct seq_file *seq, void *v)
1551 {
1552         struct tmp_s {
1553                 u64 a;
1554                 unsigned int b;
1555                 unsigned int c;
1556         };
1557         int i;
1558         struct net_device *dev = seq->private;
1559         struct stmmac_priv *priv = netdev_priv(dev);
1560
1561         seq_printf(seq, "=======================\n");
1562         seq_printf(seq, " RX descriptor ring\n");
1563         seq_printf(seq, "=======================\n");
1564
1565         for (i = 0; i < priv->dma_rx_size; i++) {
1566                 struct tmp_s *x = (struct tmp_s *)(priv->dma_rx + i);
1567                 seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
1568                            i, (unsigned int)(x->a),
1569                            (unsigned int)((x->a) >> 32), x->b, x->c);
1570                 seq_printf(seq, "\n");
1571         }
1572
1573         seq_printf(seq, "\n");
1574         seq_printf(seq, "=======================\n");
1575         seq_printf(seq, "  TX descriptor ring\n");
1576         seq_printf(seq, "=======================\n");
1577
1578         for (i = 0; i < priv->dma_tx_size; i++) {
1579                 struct tmp_s *x = (struct tmp_s *)(priv->dma_tx + i);
1580                 seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
1581                            i, (unsigned int)(x->a),
1582                            (unsigned int)((x->a) >> 32), x->b, x->c);
1583                 seq_printf(seq, "\n");
1584         }
1585
1586         return 0;
1587 }
1588
1589 static int stmmac_sysfs_ring_open(struct inode *inode, struct file *file)
1590 {
1591         return single_open(file, stmmac_sysfs_ring_read, inode->i_private);
1592 }
1593
1594 static const struct file_operations stmmac_rings_status_fops = {
1595         .owner = THIS_MODULE,
1596         .open = stmmac_sysfs_ring_open,
1597         .read = seq_read,
1598         .llseek = seq_lseek,
1599         .release = seq_release,
1600 };
1601
1602 static int stmmac_sysfs_dma_cap_read(struct seq_file *seq, void *v)
1603 {
1604         struct net_device *dev = seq->private;
1605         struct stmmac_priv *priv = netdev_priv(dev);
1606
1607         if (!priv->hw_cap_support) {
1608                 seq_printf(seq, "DMA HW features not supported\n");
1609                 return 0;
1610         }
1611
1612         seq_printf(seq, "==============================\n");
1613         seq_printf(seq, "\tDMA HW features\n");
1614         seq_printf(seq, "==============================\n");
1615
1616         seq_printf(seq, "\t10/100 Mbps %s\n",
1617                    (priv->dma_cap.mbps_10_100) ? "Y" : "N");
1618         seq_printf(seq, "\t1000 Mbps %s\n",
1619                    (priv->dma_cap.mbps_1000) ? "Y" : "N");
1620         seq_printf(seq, "\tHalf duple %s\n",
1621                    (priv->dma_cap.half_duplex) ? "Y" : "N");
1622         seq_printf(seq, "\tHash Filter: %s\n",
1623                    (priv->dma_cap.hash_filter) ? "Y" : "N");
1624         seq_printf(seq, "\tMultiple MAC address registers: %s\n",
1625                    (priv->dma_cap.multi_addr) ? "Y" : "N");
1626         seq_printf(seq, "\tPCS (TBI/SGMII/RTBI PHY interfatces): %s\n",
1627                    (priv->dma_cap.pcs) ? "Y" : "N");
1628         seq_printf(seq, "\tSMA (MDIO) Interface: %s\n",
1629                    (priv->dma_cap.sma_mdio) ? "Y" : "N");
1630         seq_printf(seq, "\tPMT Remote wake up: %s\n",
1631                    (priv->dma_cap.pmt_remote_wake_up) ? "Y" : "N");
1632         seq_printf(seq, "\tPMT Magic Frame: %s\n",
1633                    (priv->dma_cap.pmt_magic_frame) ? "Y" : "N");
1634         seq_printf(seq, "\tRMON module: %s\n",
1635                    (priv->dma_cap.rmon) ? "Y" : "N");
1636         seq_printf(seq, "\tIEEE 1588-2002 Time Stamp: %s\n",
1637                    (priv->dma_cap.time_stamp) ? "Y" : "N");
1638         seq_printf(seq, "\tIEEE 1588-2008 Advanced Time Stamp:%s\n",
1639                    (priv->dma_cap.atime_stamp) ? "Y" : "N");
1640         seq_printf(seq, "\t802.3az - Energy-Efficient Ethernet (EEE) %s\n",
1641                    (priv->dma_cap.eee) ? "Y" : "N");
1642         seq_printf(seq, "\tAV features: %s\n", (priv->dma_cap.av) ? "Y" : "N");
1643         seq_printf(seq, "\tChecksum Offload in TX: %s\n",
1644                    (priv->dma_cap.tx_coe) ? "Y" : "N");
1645         seq_printf(seq, "\tIP Checksum Offload (type1) in RX: %s\n",
1646                    (priv->dma_cap.rx_coe_type1) ? "Y" : "N");
1647         seq_printf(seq, "\tIP Checksum Offload (type2) in RX: %s\n",
1648                    (priv->dma_cap.rx_coe_type2) ? "Y" : "N");
1649         seq_printf(seq, "\tRXFIFO > 2048bytes: %s\n",
1650                    (priv->dma_cap.rxfifo_over_2048) ? "Y" : "N");
1651         seq_printf(seq, "\tNumber of Additional RX channel: %d\n",
1652                    priv->dma_cap.number_rx_channel);
1653         seq_printf(seq, "\tNumber of Additional TX channel: %d\n",
1654                    priv->dma_cap.number_tx_channel);
1655         seq_printf(seq, "\tEnhanced descriptors: %s\n",
1656                    (priv->dma_cap.enh_desc) ? "Y" : "N");
1657
1658         return 0;
1659 }
1660
1661 static int stmmac_sysfs_dma_cap_open(struct inode *inode, struct file *file)
1662 {
1663         return single_open(file, stmmac_sysfs_dma_cap_read, inode->i_private);
1664 }
1665
1666 static const struct file_operations stmmac_dma_cap_fops = {
1667         .owner = THIS_MODULE,
1668         .open = stmmac_sysfs_dma_cap_open,
1669         .read = seq_read,
1670         .llseek = seq_lseek,
1671         .release = seq_release,
1672 };
1673
1674 static int stmmac_init_fs(struct net_device *dev)
1675 {
1676         /* Create debugfs entries */
1677         stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);
1678
1679         if (!stmmac_fs_dir || IS_ERR(stmmac_fs_dir)) {
1680                 pr_err("ERROR %s, debugfs create directory failed\n",
1681                        STMMAC_RESOURCE_NAME);
1682
1683                 return -ENOMEM;
1684         }
1685
1686         /* Entry to report DMA RX/TX rings */
1687         stmmac_rings_status = debugfs_create_file("descriptors_status",
1688                                            S_IRUGO, stmmac_fs_dir, dev,
1689                                            &stmmac_rings_status_fops);
1690
1691         if (!stmmac_rings_status || IS_ERR(stmmac_rings_status)) {
1692                 pr_info("ERROR creating stmmac ring debugfs file\n");
1693                 debugfs_remove(stmmac_fs_dir);
1694
1695                 return -ENOMEM;
1696         }
1697
1698         /* Entry to report the DMA HW features */
1699         stmmac_dma_cap = debugfs_create_file("dma_cap", S_IRUGO, stmmac_fs_dir,
1700                                              dev, &stmmac_dma_cap_fops);
1701
1702         if (!stmmac_dma_cap || IS_ERR(stmmac_dma_cap)) {
1703                 pr_info("ERROR creating stmmac MMC debugfs file\n");
1704                 debugfs_remove(stmmac_rings_status);
1705                 debugfs_remove(stmmac_fs_dir);
1706
1707                 return -ENOMEM;
1708         }
1709
1710         return 0;
1711 }
1712
1713 static void stmmac_exit_fs(void)
1714 {
1715         debugfs_remove(stmmac_rings_status);
1716         debugfs_remove(stmmac_dma_cap);
1717         debugfs_remove(stmmac_fs_dir);
1718 }
1719 #endif /* CONFIG_STMMAC_DEBUG_FS */
1720
1721 static const struct net_device_ops stmmac_netdev_ops = {
1722         .ndo_open = stmmac_open,
1723         .ndo_start_xmit = stmmac_xmit,
1724         .ndo_stop = stmmac_release,
1725         .ndo_change_mtu = stmmac_change_mtu,
1726         .ndo_fix_features = stmmac_fix_features,
1727         .ndo_set_rx_mode = stmmac_set_rx_mode,
1728         .ndo_tx_timeout = stmmac_tx_timeout,
1729         .ndo_do_ioctl = stmmac_ioctl,
1730         .ndo_set_config = stmmac_config,
1731 #ifdef CONFIG_NET_POLL_CONTROLLER
1732         .ndo_poll_controller = stmmac_poll_controller,
1733 #endif
1734         .ndo_set_mac_address = eth_mac_addr,
1735 };
1736
1737 /**
1738  * stmmac_probe - Initialization of the adapter .
1739  * @dev : device pointer
1740  * Description: The function initializes the network device structure for
1741  * the STMMAC driver. It also calls the low level routines
1742  * in order to init the HW (i.e. the DMA engine)
1743  */
1744 static int stmmac_probe(struct net_device *dev)
1745 {
1746         int ret = 0;
1747         struct stmmac_priv *priv = netdev_priv(dev);
1748
1749         ether_setup(dev);
1750
1751         dev->netdev_ops = &stmmac_netdev_ops;
1752         stmmac_set_ethtool_ops(dev);
1753
1754         dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1755         dev->features |= dev->hw_features | NETIF_F_HIGHDMA;
1756         dev->watchdog_timeo = msecs_to_jiffies(watchdog);
1757 #ifdef STMMAC_VLAN_TAG_USED
1758         /* Both mac100 and gmac support receive VLAN tag detection */
1759         dev->features |= NETIF_F_HW_VLAN_RX;
1760 #endif
1761         priv->msg_enable = netif_msg_init(debug, default_msg_level);
1762
1763         if (flow_ctrl)
1764                 priv->flow_ctrl = FLOW_AUTO;    /* RX/TX pause on */
1765
1766         priv->pause = pause;
1767         netif_napi_add(dev, &priv->napi, stmmac_poll, 64);
1768
1769         /* Get the MAC address */
1770         priv->hw->mac->get_umac_addr((void __iomem *) dev->base_addr,
1771                                      dev->dev_addr, 0);
1772
1773         if (!is_valid_ether_addr(dev->dev_addr))
1774                 pr_warning("\tno valid MAC address;"
1775                         "please, use ifconfig or nwhwconfig!\n");
1776
1777         spin_lock_init(&priv->lock);
1778         spin_lock_init(&priv->tx_lock);
1779
1780         ret = register_netdev(dev);
1781         if (ret) {
1782                 pr_err("%s: ERROR %i registering the device\n",
1783                        __func__, ret);
1784                 return -ENODEV;
1785         }
1786
1787         DBG(probe, DEBUG, "%s: Scatter/Gather: %s - HW checksums: %s\n",
1788             dev->name, (dev->features & NETIF_F_SG) ? "on" : "off",
1789             (dev->features & NETIF_F_IP_CSUM) ? "on" : "off");
1790
1791         return ret;
1792 }
1793
1794 /**
1795  * stmmac_mac_device_setup
1796  * @dev : device pointer
1797  * Description: select and initialise the mac device (mac100 or Gmac).
1798  */
1799 static int stmmac_mac_device_setup(struct net_device *dev)
1800 {
1801         struct stmmac_priv *priv = netdev_priv(dev);
1802
1803         struct mac_device_info *device;
1804
1805         if (priv->plat->has_gmac) {
1806                 dev->priv_flags |= IFF_UNICAST_FLT;
1807                 device = dwmac1000_setup(priv->ioaddr);
1808         } else {
1809                 device = dwmac100_setup(priv->ioaddr);
1810         }
1811
1812         if (!device)
1813                 return -ENOMEM;
1814
1815         priv->hw = device;
1816         priv->hw->ring = &ring_mode_ops;
1817
1818         if (device_can_wakeup(priv->device)) {
1819                 priv->wolopts = WAKE_MAGIC; /* Magic Frame as default */
1820                 enable_irq_wake(priv->wol_irq);
1821         }
1822
1823         return 0;
1824 }
1825
1826 /**
1827  * stmmac_dvr_probe
1828  * @pdev: platform device pointer
1829  * Description: the driver is initialized through platform_device.
1830  */
1831 static int stmmac_dvr_probe(struct platform_device *pdev)
1832 {
1833         int ret = 0;
1834         struct resource *res;
1835         void __iomem *addr = NULL;
1836         struct net_device *ndev = NULL;
1837         struct stmmac_priv *priv = NULL;
1838         struct plat_stmmacenet_data *plat_dat;
1839
1840         pr_info("STMMAC driver:\n\tplatform registration... ");
1841         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1842         if (!res)
1843                 return -ENODEV;
1844         pr_info("\tdone!\n");
1845
1846         if (!request_mem_region(res->start, resource_size(res),
1847                                 pdev->name)) {
1848                 pr_err("%s: ERROR: memory allocation failed"
1849                        "cannot get the I/O addr 0x%x\n",
1850                        __func__, (unsigned int)res->start);
1851                 return -EBUSY;
1852         }
1853
1854         addr = ioremap(res->start, resource_size(res));
1855         if (!addr) {
1856                 pr_err("%s: ERROR: memory mapping failed\n", __func__);
1857                 ret = -ENOMEM;
1858                 goto out_release_region;
1859         }
1860
1861         ndev = alloc_etherdev(sizeof(struct stmmac_priv));
1862         if (!ndev) {
1863                 pr_err("%s: ERROR: allocating the device\n", __func__);
1864                 ret = -ENOMEM;
1865                 goto out_unmap;
1866         }
1867
1868         SET_NETDEV_DEV(ndev, &pdev->dev);
1869
1870         /* Get the MAC information */
1871         ndev->irq = platform_get_irq_byname(pdev, "macirq");
1872         if (ndev->irq == -ENXIO) {
1873                 pr_err("%s: ERROR: MAC IRQ configuration "
1874                        "information not found\n", __func__);
1875                 ret = -ENXIO;
1876                 goto out_free_ndev;
1877         }
1878
1879         priv = netdev_priv(ndev);
1880         priv->device = &(pdev->dev);
1881         priv->dev = ndev;
1882         plat_dat = pdev->dev.platform_data;
1883
1884         priv->plat = plat_dat;
1885
1886         priv->ioaddr = addr;
1887
1888         /*
1889          * On some platforms e.g. SPEAr the wake up irq differs from the mac irq
1890          * The external wake up irq can be passed through the platform code
1891          * named as "eth_wake_irq"
1892          *
1893          * In case the wake up interrupt is not passed from the platform
1894          * so the driver will continue to use the mac irq (ndev->irq)
1895          */
1896         priv->wol_irq = platform_get_irq_byname(pdev, "eth_wake_irq");
1897         if (priv->wol_irq == -ENXIO)
1898                 priv->wol_irq = ndev->irq;
1899
1900         platform_set_drvdata(pdev, ndev);
1901
1902         /* Set the I/O base addr */
1903         ndev->base_addr = (unsigned long)addr;
1904
1905         /* Custom initialisation */
1906         if (priv->plat->init) {
1907                 ret = priv->plat->init(pdev);
1908                 if (unlikely(ret))
1909                         goto out_free_ndev;
1910         }
1911
1912         /* MAC HW device detection */
1913         ret = stmmac_mac_device_setup(ndev);
1914         if (ret < 0)
1915                 goto out_plat_exit;
1916
1917         /* Network Device Registration */
1918         ret = stmmac_probe(ndev);
1919         if (ret < 0)
1920                 goto out_plat_exit;
1921
1922         /* Override with kernel parameters if supplied XXX CRS XXX
1923          * this needs to have multiple instances */
1924         if ((phyaddr >= 0) && (phyaddr <= 31))
1925                 priv->plat->phy_addr = phyaddr;
1926
1927         pr_info("\t%s - (dev. name: %s - id: %d, IRQ #%d\n"
1928                "\tIO base addr: 0x%p)\n", ndev->name, pdev->name,
1929                pdev->id, ndev->irq, addr);
1930
1931         /* MDIO bus Registration */
1932         pr_debug("\tMDIO bus (id: %d)...", priv->plat->bus_id);
1933         ret = stmmac_mdio_register(ndev);
1934         if (ret < 0)
1935                 goto out_unregister;
1936         pr_debug("registered!\n");
1937
1938 #ifdef CONFIG_STMMAC_DEBUG_FS
1939         ret = stmmac_init_fs(ndev);
1940         if (ret < 0)
1941                 pr_warning("\tFailed debugFS registration");
1942 #endif
1943
1944         return 0;
1945
1946 out_unregister:
1947         unregister_netdev(ndev);
1948 out_plat_exit:
1949         if (priv->plat->exit)
1950                 priv->plat->exit(pdev);
1951 out_free_ndev:
1952         free_netdev(ndev);
1953         platform_set_drvdata(pdev, NULL);
1954 out_unmap:
1955         iounmap(addr);
1956 out_release_region:
1957         release_mem_region(res->start, resource_size(res));
1958
1959         return ret;
1960 }
1961
1962 /**
1963  * stmmac_dvr_remove
1964  * @pdev: platform device pointer
1965  * Description: this function resets the TX/RX processes, disables the MAC RX/TX
1966  * changes the link status, releases the DMA descriptor rings,
1967  * unregisters the MDIO bus and unmaps the allocated memory.
1968  */
1969 static int stmmac_dvr_remove(struct platform_device *pdev)
1970 {
1971         struct net_device *ndev = platform_get_drvdata(pdev);
1972         struct stmmac_priv *priv = netdev_priv(ndev);
1973         struct resource *res;
1974
1975         pr_info("%s:\n\tremoving driver", __func__);
1976
1977         priv->hw->dma->stop_rx(priv->ioaddr);
1978         priv->hw->dma->stop_tx(priv->ioaddr);
1979
1980         stmmac_disable_mac(priv->ioaddr);
1981
1982         netif_carrier_off(ndev);
1983
1984         stmmac_mdio_unregister(ndev);
1985
1986         if (priv->plat->exit)
1987                 priv->plat->exit(pdev);
1988
1989         platform_set_drvdata(pdev, NULL);
1990         unregister_netdev(ndev);
1991
1992         iounmap((void *)priv->ioaddr);
1993         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1994         release_mem_region(res->start, resource_size(res));
1995
1996 #ifdef CONFIG_STMMAC_DEBUG_FS
1997         stmmac_exit_fs();
1998 #endif
1999
2000         free_netdev(ndev);
2001
2002         return 0;
2003 }
2004
2005 #ifdef CONFIG_PM
2006 static int stmmac_suspend(struct device *dev)
2007 {
2008         struct net_device *ndev = dev_get_drvdata(dev);
2009         struct stmmac_priv *priv = netdev_priv(ndev);
2010         int dis_ic = 0;
2011
2012         if (!ndev || !netif_running(ndev))
2013                 return 0;
2014
2015         if (priv->phydev)
2016                 phy_stop(priv->phydev);
2017
2018         spin_lock(&priv->lock);
2019
2020         netif_device_detach(ndev);
2021         netif_stop_queue(ndev);
2022
2023 #ifdef CONFIG_STMMAC_TIMER
2024         priv->tm->timer_stop();
2025         if (likely(priv->tm->enable))
2026                 dis_ic = 1;
2027 #endif
2028         napi_disable(&priv->napi);
2029
2030         /* Stop TX/RX DMA */
2031         priv->hw->dma->stop_tx(priv->ioaddr);
2032         priv->hw->dma->stop_rx(priv->ioaddr);
2033         /* Clear the Rx/Tx descriptors */
2034         priv->hw->desc->init_rx_desc(priv->dma_rx, priv->dma_rx_size,
2035                                      dis_ic);
2036         priv->hw->desc->init_tx_desc(priv->dma_tx, priv->dma_tx_size);
2037
2038         /* Enable Power down mode by programming the PMT regs */
2039         if (device_may_wakeup(priv->device))
2040                 priv->hw->mac->pmt(priv->ioaddr, priv->wolopts);
2041         else
2042                 stmmac_disable_mac(priv->ioaddr);
2043
2044         spin_unlock(&priv->lock);
2045         return 0;
2046 }
2047
2048 static int stmmac_resume(struct device *dev)
2049 {
2050         struct net_device *ndev = dev_get_drvdata(dev);
2051         struct stmmac_priv *priv = netdev_priv(ndev);
2052
2053         if (!netif_running(ndev))
2054                 return 0;
2055
2056         spin_lock(&priv->lock);
2057
2058         /* Power Down bit, into the PM register, is cleared
2059          * automatically as soon as a magic packet or a Wake-up frame
2060          * is received. Anyway, it's better to manually clear
2061          * this bit because it can generate problems while resuming
2062          * from another devices (e.g. serial console). */
2063         if (device_may_wakeup(priv->device))
2064                 priv->hw->mac->pmt(priv->ioaddr, 0);
2065
2066         netif_device_attach(ndev);
2067
2068         /* Enable the MAC and DMA */
2069         stmmac_enable_mac(priv->ioaddr);
2070         priv->hw->dma->start_tx(priv->ioaddr);
2071         priv->hw->dma->start_rx(priv->ioaddr);
2072
2073 #ifdef CONFIG_STMMAC_TIMER
2074         if (likely(priv->tm->enable))
2075                 priv->tm->timer_start(tmrate);
2076 #endif
2077         napi_enable(&priv->napi);
2078
2079         netif_start_queue(ndev);
2080
2081         spin_unlock(&priv->lock);
2082
2083         if (priv->phydev)
2084                 phy_start(priv->phydev);
2085
2086         return 0;
2087 }
2088
2089 static int stmmac_freeze(struct device *dev)
2090 {
2091         struct net_device *ndev = dev_get_drvdata(dev);
2092
2093         if (!ndev || !netif_running(ndev))
2094                 return 0;
2095
2096         return stmmac_release(ndev);
2097 }
2098
2099 static int stmmac_restore(struct device *dev)
2100 {
2101         struct net_device *ndev = dev_get_drvdata(dev);
2102
2103         if (!ndev || !netif_running(ndev))
2104                 return 0;
2105
2106         return stmmac_open(ndev);
2107 }
2108
2109 static const struct dev_pm_ops stmmac_pm_ops = {
2110         .suspend = stmmac_suspend,
2111         .resume = stmmac_resume,
2112         .freeze = stmmac_freeze,
2113         .thaw = stmmac_restore,
2114         .restore = stmmac_restore,
2115 };
2116 #else
2117 static const struct dev_pm_ops stmmac_pm_ops;
2118 #endif /* CONFIG_PM */
2119
2120 static struct platform_driver stmmac_driver = {
2121         .probe = stmmac_dvr_probe,
2122         .remove = stmmac_dvr_remove,
2123         .driver = {
2124                 .name = STMMAC_RESOURCE_NAME,
2125                 .owner = THIS_MODULE,
2126                 .pm = &stmmac_pm_ops,
2127         },
2128 };
2129
2130 /**
2131  * stmmac_init_module - Entry point for the driver
2132  * Description: This function is the entry point for the driver.
2133  */
2134 static int __init stmmac_init_module(void)
2135 {
2136         int ret;
2137
2138         ret = platform_driver_register(&stmmac_driver);
2139         return ret;
2140 }
2141
2142 /**
2143  * stmmac_cleanup_module - Cleanup routine for the driver
2144  * Description: This function is the cleanup routine for the driver.
2145  */
2146 static void __exit stmmac_cleanup_module(void)
2147 {
2148         platform_driver_unregister(&stmmac_driver);
2149 }
2150
2151 #ifndef MODULE
2152 static int __init stmmac_cmdline_opt(char *str)
2153 {
2154         char *opt;
2155
2156         if (!str || !*str)
2157                 return -EINVAL;
2158         while ((opt = strsep(&str, ",")) != NULL) {
2159                 if (!strncmp(opt, "debug:", 6)) {
2160                         if (strict_strtoul(opt + 6, 0, (unsigned long *)&debug))
2161                                 goto err;
2162                 } else if (!strncmp(opt, "phyaddr:", 8)) {
2163                         if (strict_strtoul(opt + 8, 0,
2164                                            (unsigned long *)&phyaddr))
2165                                 goto err;
2166                 } else if (!strncmp(opt, "dma_txsize:", 11)) {
2167                         if (strict_strtoul(opt + 11, 0,
2168                                            (unsigned long *)&dma_txsize))
2169                                 goto err;
2170                 } else if (!strncmp(opt, "dma_rxsize:", 11)) {
2171                         if (strict_strtoul(opt + 11, 0,
2172                                            (unsigned long *)&dma_rxsize))
2173                                 goto err;
2174                 } else if (!strncmp(opt, "buf_sz:", 7)) {
2175                         if (strict_strtoul(opt + 7, 0,
2176                                            (unsigned long *)&buf_sz))
2177                                 goto err;
2178                 } else if (!strncmp(opt, "tc:", 3)) {
2179                         if (strict_strtoul(opt + 3, 0, (unsigned long *)&tc))
2180                                 goto err;
2181                 } else if (!strncmp(opt, "watchdog:", 9)) {
2182                         if (strict_strtoul(opt + 9, 0,
2183                                            (unsigned long *)&watchdog))
2184                                 goto err;
2185                 } else if (!strncmp(opt, "flow_ctrl:", 10)) {
2186                         if (strict_strtoul(opt + 10, 0,
2187                                            (unsigned long *)&flow_ctrl))
2188                                 goto err;
2189                 } else if (!strncmp(opt, "pause:", 6)) {
2190                         if (strict_strtoul(opt + 6, 0, (unsigned long *)&pause))
2191                                 goto err;
2192 #ifdef CONFIG_STMMAC_TIMER
2193                 } else if (!strncmp(opt, "tmrate:", 7)) {
2194                         if (strict_strtoul(opt + 7, 0,
2195                                            (unsigned long *)&tmrate))
2196                                 goto err;
2197 #endif
2198                 }
2199         }
2200         return 0;
2201
2202 err:
2203         pr_err("%s: ERROR broken module parameter conversion", __func__);
2204         return -EINVAL;
2205 }
2206
2207 __setup("stmmaceth=", stmmac_cmdline_opt);
2208 #endif
2209
2210 module_init(stmmac_init_module);
2211 module_exit(stmmac_cleanup_module);
2212
2213 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet driver");
2214 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
2215 MODULE_LICENSE("GPL");