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