drivers/net/stmmac/stmmac_main.c

   1 /*******************************************************************************
   2   This is the driver for the ST MAC 10/100/1000 on-chip Ethernet controllers.
   3   ST Ethernet IPs are built around a Synopsys IP Core.
   4
   5   Copyright (C) 2007-2009  STMicroelectronics Ltd
   6
   7   This program is free software; you can redistribute it and/or modify it
   8   under the terms and conditions of the GNU General Public License,
   9   version 2, as published by the Free Software Foundation.
  10
  11   This program is distributed in the hope it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc.,
  18   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  19
  20   The full GNU General Public License is included in this distribution in
  21   the file called "COPYING".
  22
  23   Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
  24
  25   Documentation available at:
  26         http://www.stlinux.com
  27   Support available at:
  28         https://bugzilla.stlinux.com/
  29 *******************************************************************************/
  30
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/kernel.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/etherdevice.h>
  36 #include <linux/platform_device.h>
  37 #include <linux/ip.h>
  38 #include <linux/tcp.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/ethtool.h>
  41 #include <linux/if_ether.h>
  42 #include <linux/crc32.h>
  43 #include <linux/mii.h>
  44 #include <linux/phy.h>
  45 #include <linux/if_vlan.h>
  46 #include <linux/dma-mapping.h>
  47 #include <linux/slab.h>
  48 #include "stmmac.h"
  49
  50 #define STMMAC_RESOURCE_NAME    "stmmaceth"
  51 #define PHY_RESOURCE_NAME       "stmmacphy"
  52
  53 #undef STMMAC_DEBUG
  54 /*#define STMMAC_DEBUG*/
  55 #ifdef STMMAC_DEBUG
  56 #define DBG(nlevel, klevel, fmt, args...) \
  57                 ((void)(netif_msg_##nlevel(priv) && \
  58                 printk(KERN_##klevel fmt, ## args)))
  59 #else
  60 #define DBG(nlevel, klevel, fmt, args...) do { } while (0)
  61 #endif
  62
  63 #undef STMMAC_RX_DEBUG
  64 /*#define STMMAC_RX_DEBUG*/
  65 #ifdef STMMAC_RX_DEBUG
  66 #define RX_DBG(fmt, args...)  printk(fmt, ## args)
  67 #else
  68 #define RX_DBG(fmt, args...)  do { } while (0)
  69 #endif
  70
  71 #undef STMMAC_XMIT_DEBUG
  72 /*#define STMMAC_XMIT_DEBUG*/
  73 #ifdef STMMAC_TX_DEBUG
  74 #define TX_DBG(fmt, args...)  printk(fmt, ## args)
  75 #else
  76 #define TX_DBG(fmt, args...)  do { } while (0)
  77 #endif
  78
  79 #define STMMAC_ALIGN(x) L1_CACHE_ALIGN(x)
  80 #define JUMBO_LEN       9000
  81
  82 /* Module parameters */
  83 #define TX_TIMEO 5000 /* default 5 seconds */
  84 static int watchdog = TX_TIMEO;
  85 module_param(watchdog, int, S_IRUGO | S_IWUSR);
  86 MODULE_PARM_DESC(watchdog, "Transmit timeout in milliseconds");
  87
  88 static int debug = -1;          /* -1: default, 0: no output, 16:  all */
  89 module_param(debug, int, S_IRUGO | S_IWUSR);
  90 MODULE_PARM_DESC(debug, "Message Level (0: no output, 16: all)");
  91
  92 static int phyaddr = -1;
  93 module_param(phyaddr, int, S_IRUGO);
  94 MODULE_PARM_DESC(phyaddr, "Physical device address");
  95
  96 #define DMA_TX_SIZE 256
  97 static int dma_txsize = DMA_TX_SIZE;
  98 module_param(dma_txsize, int, S_IRUGO | S_IWUSR);
  99 MODULE_PARM_DESC(dma_txsize, "Number of descriptors in the TX list");
 100
 101 #define DMA_RX_SIZE 256
 102 static int dma_rxsize = DMA_RX_SIZE;
 103 module_param(dma_rxsize, int, S_IRUGO | S_IWUSR);
 104 MODULE_PARM_DESC(dma_rxsize, "Number of descriptors in the RX list");
 105
 106 static int flow_ctrl = FLOW_OFF;
 107 module_param(flow_ctrl, int, S_IRUGO | S_IWUSR);
 108 MODULE_PARM_DESC(flow_ctrl, "Flow control ability [on/off]");
 109
 110 static int pause = PAUSE_TIME;
 111 module_param(pause, int, S_IRUGO | S_IWUSR);
 112 MODULE_PARM_DESC(pause, "Flow Control Pause Time");
 113
 114 #define TC_DEFAULT 64
 115 static int tc = TC_DEFAULT;
 116 module_param(tc, int, S_IRUGO | S_IWUSR);
 117 MODULE_PARM_DESC(tc, "DMA threshold control value");
 118
 119 #define RX_NO_COALESCE  1       /* Always interrupt on completion */
 120 #define TX_NO_COALESCE  -1      /* No moderation by default */
 121
 122 /* Pay attention to tune this parameter; take care of both
 123  * hardware capability and network stabitily/performance impact.
 124  * Many tests showed that ~4ms latency seems to be good enough. */
 125 #ifdef CONFIG_STMMAC_TIMER
 126 #define DEFAULT_PERIODIC_RATE   256
 127 static int tmrate = DEFAULT_PERIODIC_RATE;
 128 module_param(tmrate, int, S_IRUGO | S_IWUSR);
 129 MODULE_PARM_DESC(tmrate, "External timer freq. (default: 256Hz)");
 130 #endif
 131
 132 #define DMA_BUFFER_SIZE BUF_SIZE_2KiB
 133 static int buf_sz = DMA_BUFFER_SIZE;
 134 module_param(buf_sz, int, S_IRUGO | S_IWUSR);
 135 MODULE_PARM_DESC(buf_sz, "DMA buffer size");
 136
 137 static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
 138                                       NETIF_MSG_LINK | NETIF_MSG_IFUP |
 139                                       NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);
 140
 141 static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
 142 static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev);
 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
 307         priv->oldlink = 0;
 308         priv->speed = 0;
 309         priv->oldduplex = -1;
 310
 311         if (priv->phy_addr == -1) {
 312                 /* We don't have a PHY, so do nothing */
 313                 return 0;
 314         }
 315
 316         snprintf(bus_id, MII_BUS_ID_SIZE, "%x", priv->plat->bus_id);
 317         snprintf(phy_id, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
 318                  priv->phy_addr);
 319         pr_debug("stmmac_init_phy:  trying to attach to %s\n", phy_id);
 320
 321         phydev = phy_connect(dev, phy_id, &stmmac_adjust_link, 0,
 322                         priv->phy_interface);
 323
 324         if (IS_ERR(phydev)) {
 325                 pr_err("%s: Could not attach to PHY\n", dev->name);
 326                 return PTR_ERR(phydev);
 327         }
 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 /**
 389  * init_dma_desc_rings - init the RX/TX descriptor rings
 390  * @dev: net device structure
 391  * Description:  this function initializes the DMA RX/TX descriptors
 392  * and allocates the socket buffers.
 393  */
 394 static void init_dma_desc_rings(struct net_device *dev)
 395 {
 396         int i;
 397         struct stmmac_priv *priv = netdev_priv(dev);
 398         struct sk_buff *skb;
 399         unsigned int txsize = priv->dma_tx_size;
 400         unsigned int rxsize = priv->dma_rx_size;
 401         unsigned int bfsize = priv->dma_buf_sz;
 402         int buff2_needed = 0, dis_ic = 0;
 403
 404         /* Set the Buffer size according to the MTU;
 405          * indeed, in case of jumbo we need to bump-up the buffer sizes.
 406          */
 407         if (unlikely(dev->mtu >= BUF_SIZE_8KiB))
 408                 bfsize = BUF_SIZE_16KiB;
 409         else if (unlikely(dev->mtu >= BUF_SIZE_4KiB))
 410                 bfsize = BUF_SIZE_8KiB;
 411         else if (unlikely(dev->mtu >= BUF_SIZE_2KiB))
 412                 bfsize = BUF_SIZE_4KiB;
 413         else if (unlikely(dev->mtu >= DMA_BUFFER_SIZE))
 414                 bfsize = BUF_SIZE_2KiB;
 415         else
 416                 bfsize = DMA_BUFFER_SIZE;
 417
 418 #ifdef CONFIG_STMMAC_TIMER
 419         /* Disable interrupts on completion for the reception if timer is on */
 420         if (likely(priv->tm->enable))
 421                 dis_ic = 1;
 422 #endif
 423         /* If the MTU exceeds 8k so use the second buffer in the chain */
 424         if (bfsize >= BUF_SIZE_8KiB)
 425                 buff2_needed = 1;
 426
 427         DBG(probe, INFO, "stmmac: txsize %d, rxsize %d, bfsize %d\n",
 428             txsize, rxsize, bfsize);
 429
 430         priv->rx_skbuff_dma = kmalloc(rxsize * sizeof(dma_addr_t), GFP_KERNEL);
 431         priv->rx_skbuff =
 432             kmalloc(sizeof(struct sk_buff *) * rxsize, GFP_KERNEL);
 433         priv->dma_rx =
 434             (struct dma_desc *)dma_alloc_coherent(priv->device,
 435                                                   rxsize *
 436                                                   sizeof(struct dma_desc),
 437                                                   &priv->dma_rx_phy,
 438                                                   GFP_KERNEL);
 439         priv->tx_skbuff = kmalloc(sizeof(struct sk_buff *) * txsize,
 440                                        GFP_KERNEL);
 441         priv->dma_tx =
 442             (struct dma_desc *)dma_alloc_coherent(priv->device,
 443                                                   txsize *
 444                                                   sizeof(struct dma_desc),
 445                                                   &priv->dma_tx_phy,
 446                                                   GFP_KERNEL);
 447
 448         if ((priv->dma_rx == NULL) || (priv->dma_tx == NULL)) {
 449                 pr_err("%s:ERROR allocating the DMA Tx/Rx desc\n", __func__);
 450                 return;
 451         }
 452
 453         DBG(probe, INFO, "stmmac (%s) DMA desc rings: virt addr (Rx %p, "
 454             "Tx %p)\n\tDMA phy addr (Rx 0x%08x, Tx 0x%08x)\n",
 455             dev->name, priv->dma_rx, priv->dma_tx,
 456             (unsigned int)priv->dma_rx_phy, (unsigned int)priv->dma_tx_phy);
 457
 458         /* RX INITIALIZATION */
 459         DBG(probe, INFO, "stmmac: SKB addresses:\n"
 460                          "skb\t\tskb data\tdma data\n");
 461
 462         for (i = 0; i < rxsize; i++) {
 463                 struct dma_desc *p = priv->dma_rx + i;
 464
 465                 skb = netdev_alloc_skb_ip_align(dev, bfsize);
 466                 if (unlikely(skb == NULL)) {
 467                         pr_err("%s: Rx init fails; skb is NULL\n", __func__);
 468                         break;
 469                 }
 470                 priv->rx_skbuff[i] = skb;
 471                 priv->rx_skbuff_dma[i] = dma_map_single(priv->device, skb->data,
 472                                                 bfsize, DMA_FROM_DEVICE);
 473
 474                 p->des2 = priv->rx_skbuff_dma[i];
 475                 if (unlikely(buff2_needed))
 476                         p->des3 = p->des2 + BUF_SIZE_8KiB;
 477                 DBG(probe, INFO, "[%p]\t[%p]\t[%x]\n", priv->rx_skbuff[i],
 478                         priv->rx_skbuff[i]->data, priv->rx_skbuff_dma[i]);
 479         }
 480         priv->cur_rx = 0;
 481         priv->dirty_rx = (unsigned int)(i - rxsize);
 482         priv->dma_buf_sz = bfsize;
 483         buf_sz = bfsize;
 484
 485         /* TX INITIALIZATION */
 486         for (i = 0; i < txsize; i++) {
 487                 priv->tx_skbuff[i] = NULL;
 488                 priv->dma_tx[i].des2 = 0;
 489         }
 490         priv->dirty_tx = 0;
 491         priv->cur_tx = 0;
 492
 493         /* Clear the Rx/Tx descriptors */
 494         priv->hw->desc->init_rx_desc(priv->dma_rx, rxsize, dis_ic);
 495         priv->hw->desc->init_tx_desc(priv->dma_tx, txsize);
 496
 497         if (netif_msg_hw(priv)) {
 498                 pr_info("RX descriptor ring:\n");
 499                 display_ring(priv->dma_rx, rxsize);
 500                 pr_info("TX descriptor ring:\n");
 501                 display_ring(priv->dma_tx, txsize);
 502         }
 503 }
 504
 505 static void dma_free_rx_skbufs(struct stmmac_priv *priv)
 506 {
 507         int i;
 508
 509         for (i = 0; i < priv->dma_rx_size; i++) {
 510                 if (priv->rx_skbuff[i]) {
 511                         dma_unmap_single(priv->device, priv->rx_skbuff_dma[i],
 512                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
 513                         dev_kfree_skb_any(priv->rx_skbuff[i]);
 514                 }
 515                 priv->rx_skbuff[i] = NULL;
 516         }
 517 }
 518
 519 static void dma_free_tx_skbufs(struct stmmac_priv *priv)
 520 {
 521         int i;
 522
 523         for (i = 0; i < priv->dma_tx_size; i++) {
 524                 if (priv->tx_skbuff[i] != NULL) {
 525                         struct dma_desc *p = priv->dma_tx + i;
 526                         if (p->des2)
 527                                 dma_unmap_single(priv->device, p->des2,
 528                                                  priv->hw->desc->get_tx_len(p),
 529                                                  DMA_TO_DEVICE);
 530                         dev_kfree_skb_any(priv->tx_skbuff[i]);
 531                         priv->tx_skbuff[i] = NULL;
 532                 }
 533         }
 534 }
 535
 536 static void free_dma_desc_resources(struct stmmac_priv *priv)
 537 {
 538         /* Release the DMA TX/RX socket buffers */
 539         dma_free_rx_skbufs(priv);
 540         dma_free_tx_skbufs(priv);
 541
 542         /* Free the region of consistent memory previously allocated for
 543          * the DMA */
 544         dma_free_coherent(priv->device,
 545                           priv->dma_tx_size * sizeof(struct dma_desc),
 546                           priv->dma_tx, priv->dma_tx_phy);
 547         dma_free_coherent(priv->device,
 548                           priv->dma_rx_size * sizeof(struct dma_desc),
 549                           priv->dma_rx, priv->dma_rx_phy);
 550         kfree(priv->rx_skbuff_dma);
 551         kfree(priv->rx_skbuff);
 552         kfree(priv->tx_skbuff);
 553 }
 554
 555 /**
 556  *  stmmac_dma_operation_mode - HW DMA operation mode
 557  *  @priv : pointer to the private device structure.
 558  *  Description: it sets the DMA operation mode: tx/rx DMA thresholds
 559  *  or Store-And-Forward capability.
 560  */
 561 static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 562 {
 563         if (likely((priv->plat->tx_coe) && (!priv->no_csum_insertion))) {
 564                 /* In case of GMAC, SF mode has to be enabled
 565                  * to perform the TX COE. This depends on:
 566                  * 1) TX COE if actually supported
 567                  * 2) There is no bugged Jumbo frame support
 568                  *    that needs to not insert csum in the TDES.
 569                  */
 570                 priv->hw->dma->dma_mode(priv->ioaddr,
 571                                         SF_DMA_MODE, SF_DMA_MODE);
 572                 tc = SF_DMA_MODE;
 573         } else
 574                 priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 575 }
 576
 577 /**
 578  * stmmac_tx:
 579  * @priv: private driver structure
 580  * Description: it reclaims resources after transmission completes.
 581  */
 582 static void stmmac_tx(struct stmmac_priv *priv)
 583 {
 584         unsigned int txsize = priv->dma_tx_size;
 585
 586         while (priv->dirty_tx != priv->cur_tx) {
 587                 int last;
 588                 unsigned int entry = priv->dirty_tx % txsize;
 589                 struct sk_buff *skb = priv->tx_skbuff[entry];
 590                 struct dma_desc *p = priv->dma_tx + entry;
 591
 592                 /* Check if the descriptor is owned by the DMA. */
 593                 if (priv->hw->desc->get_tx_owner(p))
 594                         break;
 595
 596                 /* Verify tx error by looking at the last segment */
 597                 last = priv->hw->desc->get_tx_ls(p);
 598                 if (likely(last)) {
 599                         int tx_error =
 600                                 priv->hw->desc->tx_status(&priv->dev->stats,
 601                                                           &priv->xstats, p,
 602                                                           priv->ioaddr);
 603                         if (likely(tx_error == 0)) {
 604                                 priv->dev->stats.tx_packets++;
 605                                 priv->xstats.tx_pkt_n++;
 606                         } else
 607                                 priv->dev->stats.tx_errors++;
 608                 }
 609                 TX_DBG("%s: curr %d, dirty %d\n", __func__,
 610                         priv->cur_tx, priv->dirty_tx);
 611
 612                 if (likely(p->des2))
 613                         dma_unmap_single(priv->device, p->des2,
 614                                          priv->hw->desc->get_tx_len(p),
 615                                          DMA_TO_DEVICE);
 616                 if (unlikely(p->des3))
 617                         p->des3 = 0;
 618
 619                 if (likely(skb != NULL)) {
 620                         /*
 621                          * If there's room in the queue (limit it to size)
 622                          * we add this skb back into the pool,
 623                          * if it's the right size.
 624                          */
 625                         if ((skb_queue_len(&priv->rx_recycle) <
 626                                 priv->dma_rx_size) &&
 627                                 skb_recycle_check(skb, priv->dma_buf_sz))
 628                                 __skb_queue_head(&priv->rx_recycle, skb);
 629                         else
 630                                 dev_kfree_skb(skb);
 631
 632                         priv->tx_skbuff[entry] = NULL;
 633                 }
 634
 635                 priv->hw->desc->release_tx_desc(p);
 636
 637                 entry = (++priv->dirty_tx) % txsize;
 638         }
 639         if (unlikely(netif_queue_stopped(priv->dev) &&
 640                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv))) {
 641                 netif_tx_lock(priv->dev);
 642                 if (netif_queue_stopped(priv->dev) &&
 643                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv)) {
 644                         TX_DBG("%s: restart transmit\n", __func__);
 645                         netif_wake_queue(priv->dev);
 646                 }
 647                 netif_tx_unlock(priv->dev);
 648         }
 649 }
 650
 651 static inline void stmmac_enable_irq(struct stmmac_priv *priv)
 652 {
 653 #ifdef CONFIG_STMMAC_TIMER
 654         if (likely(priv->tm->enable))
 655                 priv->tm->timer_start(tmrate);
 656         else
 657 #endif
 658                 priv->hw->dma->enable_dma_irq(priv->ioaddr);
 659 }
 660
 661 static inline void stmmac_disable_irq(struct stmmac_priv *priv)
 662 {
 663 #ifdef CONFIG_STMMAC_TIMER
 664         if (likely(priv->tm->enable))
 665                 priv->tm->timer_stop();
 666         else
 667 #endif
 668                 priv->hw->dma->disable_dma_irq(priv->ioaddr);
 669 }
 670
 671 static int stmmac_has_work(struct stmmac_priv *priv)
 672 {
 673         unsigned int has_work = 0;
 674         int rxret, tx_work = 0;
 675
 676         rxret = priv->hw->desc->get_rx_owner(priv->dma_rx +
 677                 (priv->cur_rx % priv->dma_rx_size));
 678
 679         if (priv->dirty_tx != priv->cur_tx)
 680                 tx_work = 1;
 681
 682         if (likely(!rxret || tx_work))
 683                 has_work = 1;
 684
 685         return has_work;
 686 }
 687
 688 static inline void _stmmac_schedule(struct stmmac_priv *priv)
 689 {
 690         if (likely(stmmac_has_work(priv))) {
 691                 stmmac_disable_irq(priv);
 692                 napi_schedule(&priv->napi);
 693         }
 694 }
 695
 696 #ifdef CONFIG_STMMAC_TIMER
 697 void stmmac_schedule(struct net_device *dev)
 698 {
 699         struct stmmac_priv *priv = netdev_priv(dev);
 700
 701         priv->xstats.sched_timer_n++;
 702
 703         _stmmac_schedule(priv);
 704 }
 705
 706 static void stmmac_no_timer_started(unsigned int x)
 707 {;
 708 };
 709
 710 static void stmmac_no_timer_stopped(void)
 711 {;
 712 };
 713 #endif
 714
 715 /**
 716  * stmmac_tx_err:
 717  * @priv: pointer to the private device structure
 718  * Description: it cleans the descriptors and restarts the transmission
 719  * in case of errors.
 720  */
 721 static void stmmac_tx_err(struct stmmac_priv *priv)
 722 {
 723
 724         netif_stop_queue(priv->dev);
 725
 726         priv->hw->dma->stop_tx(priv->ioaddr);
 727         dma_free_tx_skbufs(priv);
 728         priv->hw->desc->init_tx_desc(priv->dma_tx, priv->dma_tx_size);
 729         priv->dirty_tx = 0;
 730         priv->cur_tx = 0;
 731         priv->hw->dma->start_tx(priv->ioaddr);
 732
 733         priv->dev->stats.tx_errors++;
 734         netif_wake_queue(priv->dev);
 735 }
 736
 737
 738 static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 739 {
 740         int status;
 741
 742         status = priv->hw->dma->dma_interrupt(priv->ioaddr, &priv->xstats);
 743         if (likely(status == handle_tx_rx))
 744                 _stmmac_schedule(priv);
 745
 746         else if (unlikely(status == tx_hard_error_bump_tc)) {
 747                 /* Try to bump up the dma threshold on this failure */
 748                 if (unlikely(tc != SF_DMA_MODE) && (tc <= 256)) {
 749                         tc += 64;
 750                         priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 751                         priv->xstats.threshold = tc;
 752                 }
 753         } else if (unlikely(status == tx_hard_error))
 754                 stmmac_tx_err(priv);
 755 }
 756
 757 /**
 758  *  stmmac_open - open entry point of the driver
 759  *  @dev : pointer to the device structure.
 760  *  Description:
 761  *  This function is the open entry point of the driver.
 762  *  Return value:
 763  *  0 on success and an appropriate (-)ve integer as defined in errno.h
 764  *  file on failure.
 765  */
 766 static int stmmac_open(struct net_device *dev)
 767 {
 768         struct stmmac_priv *priv = netdev_priv(dev);
 769         int ret;
 770
 771         /* Check that the MAC address is valid.  If its not, refuse
 772          * to bring the device up. The user must specify an
 773          * address using the following linux command:
 774          *      ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx  */
 775         if (!is_valid_ether_addr(dev->dev_addr)) {
 776                 random_ether_addr(dev->dev_addr);
 777                 pr_warning("%s: generated random MAC address %pM\n", dev->name,
 778                         dev->dev_addr);
 779         }
 780
 781         stmmac_verify_args();
 782
 783 #ifdef CONFIG_STMMAC_TIMER
 784         priv->tm = kzalloc(sizeof(struct stmmac_timer *), GFP_KERNEL);
 785         if (unlikely(priv->tm == NULL)) {
 786                 pr_err("%s: ERROR: timer memory alloc failed\n", __func__);
 787                 return -ENOMEM;
 788         }
 789         priv->tm->freq = tmrate;
 790
 791         /* Test if the external timer can be actually used.
 792          * In case of failure continue without timer. */
 793         if (unlikely((stmmac_open_ext_timer(dev, priv->tm)) < 0)) {
 794                 pr_warning("stmmaceth: cannot attach the external timer.\n");
 795                 priv->tm->freq = 0;
 796                 priv->tm->timer_start = stmmac_no_timer_started;
 797                 priv->tm->timer_stop = stmmac_no_timer_stopped;
 798         } else
 799                 priv->tm->enable = 1;
 800 #endif
 801         ret = stmmac_init_phy(dev);
 802         if (unlikely(ret)) {
 803                 pr_err("%s: Cannot attach to PHY (error: %d)\n", __func__, ret);
 804                 goto open_error;
 805         }
 806
 807         /* Create and initialize the TX/RX descriptors chains. */
 808         priv->dma_tx_size = STMMAC_ALIGN(dma_txsize);
 809         priv->dma_rx_size = STMMAC_ALIGN(dma_rxsize);
 810         priv->dma_buf_sz = STMMAC_ALIGN(buf_sz);
 811         init_dma_desc_rings(dev);
 812
 813         /* DMA initialization and SW reset */
 814         ret = priv->hw->dma->init(priv->ioaddr, priv->plat->pbl,
 815                                   priv->dma_tx_phy, priv->dma_rx_phy);
 816         if (ret < 0) {
 817                 pr_err("%s: DMA initialization failed\n", __func__);
 818                 goto open_error;
 819         }
 820
 821         /* Copy the MAC addr into the HW  */
 822         priv->hw->mac->set_umac_addr(priv->ioaddr, dev->dev_addr, 0);
 823         /* If required, perform hw setup of the bus. */
 824         if (priv->plat->bus_setup)
 825                 priv->plat->bus_setup(priv->ioaddr);
 826         /* Initialize the MAC Core */
 827         priv->hw->mac->core_init(priv->ioaddr);
 828
 829         priv->rx_coe = priv->hw->mac->rx_coe(priv->ioaddr);
 830         if (priv->rx_coe)
 831                 pr_info("stmmac: Rx Checksum Offload Engine supported\n");
 832         if (priv->plat->tx_coe)
 833                 pr_info("\tTX Checksum insertion supported\n");
 834
 835         /* Initialise the MMC (if present) to disable all interrupts. */
 836         writel(0xffffffff, priv->ioaddr + MMC_HIGH_INTR_MASK);
 837         writel(0xffffffff, priv->ioaddr + MMC_LOW_INTR_MASK);
 838
 839         /* Request the IRQ lines */
 840         ret = request_irq(dev->irq, stmmac_interrupt,
 841                          IRQF_SHARED, dev->name, dev);
 842         if (unlikely(ret < 0)) {
 843                 pr_err("%s: ERROR: allocating the IRQ %d (error: %d)\n",
 844                        __func__, dev->irq, ret);
 845                 goto open_error;
 846         }
 847
 848         /* Enable the MAC Rx/Tx */
 849         stmmac_enable_mac(priv->ioaddr);
 850
 851         /* Set the HW DMA mode and the COE */
 852         stmmac_dma_operation_mode(priv);
 853
 854         /* Extra statistics */
 855         memset(&priv->xstats, 0, sizeof(struct stmmac_extra_stats));
 856         priv->xstats.threshold = tc;
 857
 858         /* Start the ball rolling... */
 859         DBG(probe, DEBUG, "%s: DMA RX/TX processes started...\n", dev->name);
 860         priv->hw->dma->start_tx(priv->ioaddr);
 861         priv->hw->dma->start_rx(priv->ioaddr);
 862
 863 #ifdef CONFIG_STMMAC_TIMER
 864         priv->tm->timer_start(tmrate);
 865 #endif
 866         /* Dump DMA/MAC registers */
 867         if (netif_msg_hw(priv)) {
 868                 priv->hw->mac->dump_regs(priv->ioaddr);
 869                 priv->hw->dma->dump_regs(priv->ioaddr);
 870         }
 871
 872         if (priv->phydev)
 873                 phy_start(priv->phydev);
 874
 875         napi_enable(&priv->napi);
 876         skb_queue_head_init(&priv->rx_recycle);
 877         netif_start_queue(dev);
 878
 879         return 0;
 880
 881 open_error:
 882 #ifdef CONFIG_STMMAC_TIMER
 883         kfree(priv->tm);
 884 #endif
 885         if (priv->phydev)
 886                 phy_disconnect(priv->phydev);
 887
 888         return ret;
 889 }
 890
 891 /**
 892  *  stmmac_release - close entry point of the driver
 893  *  @dev : device pointer.
 894  *  Description:
 895  *  This is the stop entry point of the driver.
 896  */
 897 static int stmmac_release(struct net_device *dev)
 898 {
 899         struct stmmac_priv *priv = netdev_priv(dev);
 900
 901         /* Stop and disconnect the PHY */
 902         if (priv->phydev) {
 903                 phy_stop(priv->phydev);
 904                 phy_disconnect(priv->phydev);
 905                 priv->phydev = NULL;
 906         }
 907
 908         netif_stop_queue(dev);
 909
 910 #ifdef CONFIG_STMMAC_TIMER
 911         /* Stop and release the timer */
 912         stmmac_close_ext_timer();
 913         if (priv->tm != NULL)
 914                 kfree(priv->tm);
 915 #endif
 916         napi_disable(&priv->napi);
 917         skb_queue_purge(&priv->rx_recycle);
 918
 919         /* Free the IRQ lines */
 920         free_irq(dev->irq, dev);
 921
 922         /* Stop TX/RX DMA and clear the descriptors */
 923         priv->hw->dma->stop_tx(priv->ioaddr);
 924         priv->hw->dma->stop_rx(priv->ioaddr);
 925
 926         /* Release and free the Rx/Tx resources */
 927         free_dma_desc_resources(priv);
 928
 929         /* Disable the MAC Rx/Tx */
 930         stmmac_disable_mac(priv->ioaddr);
 931
 932         netif_carrier_off(dev);
 933
 934         return 0;
 935 }
 936
 937 /*
 938  * To perform emulated hardware segmentation on skb.
 939  */
 940 static int stmmac_sw_tso(struct stmmac_priv *priv, struct sk_buff *skb)
 941 {
 942         struct sk_buff *segs, *curr_skb;
 943         int gso_segs = skb_shinfo(skb)->gso_segs;
 944
 945         /* Estimate the number of fragments in the worst case */
 946         if (unlikely(stmmac_tx_avail(priv) < gso_segs)) {
 947                 netif_stop_queue(priv->dev);
 948                 TX_DBG(KERN_ERR "%s: TSO BUG! Tx Ring full when queue awake\n",
 949                        __func__);
 950                 if (stmmac_tx_avail(priv) < gso_segs)
 951                         return NETDEV_TX_BUSY;
 952
 953                 netif_wake_queue(priv->dev);
 954         }
 955         TX_DBG("\tstmmac_sw_tso: segmenting: skb %p (len %d)\n",
 956                skb, skb->len);
 957
 958         segs = skb_gso_segment(skb, priv->dev->features & ~NETIF_F_TSO);
 959         if (IS_ERR(segs))
 960                 goto sw_tso_end;
 961
 962         do {
 963                 curr_skb = segs;
 964                 segs = segs->next;
 965                 TX_DBG("\t\tcurrent skb->len: %d, *curr %p,"
 966                        "*next %p\n", curr_skb->len, curr_skb, segs);
 967                 curr_skb->next = NULL;
 968                 stmmac_xmit(curr_skb, priv->dev);
 969         } while (segs);
 970
 971 sw_tso_end:
 972         dev_kfree_skb(skb);
 973
 974         return NETDEV_TX_OK;
 975 }
 976
 977 static unsigned int stmmac_handle_jumbo_frames(struct sk_buff *skb,
 978                                                struct net_device *dev,
 979                                                int csum_insertion)
 980 {
 981         struct stmmac_priv *priv = netdev_priv(dev);
 982         unsigned int nopaged_len = skb_headlen(skb);
 983         unsigned int txsize = priv->dma_tx_size;
 984         unsigned int entry = priv->cur_tx % txsize;
 985         struct dma_desc *desc = priv->dma_tx + entry;
 986
 987         if (nopaged_len > BUF_SIZE_8KiB) {
 988
 989                 int buf2_size = nopaged_len - BUF_SIZE_8KiB;
 990
 991                 desc->des2 = dma_map_single(priv->device, skb->data,
 992                                             BUF_SIZE_8KiB, DMA_TO_DEVICE);
 993                 desc->des3 = desc->des2 + BUF_SIZE_4KiB;
 994                 priv->hw->desc->prepare_tx_desc(desc, 1, BUF_SIZE_8KiB,
 995                                                 csum_insertion);
 996
 997                 entry = (++priv->cur_tx) % txsize;
 998                 desc = priv->dma_tx + entry;
 999
1000                 desc->des2 = dma_map_single(priv->device,
1001                                         skb->data + BUF_SIZE_8KiB,
1002                                         buf2_size, DMA_TO_DEVICE);
1003                 desc->des3 = desc->des2 + BUF_SIZE_4KiB;
1004                 priv->hw->desc->prepare_tx_desc(desc, 0, buf2_size,
1005                                                 csum_insertion);
1006                 priv->hw->desc->set_tx_owner(desc);
1007                 priv->tx_skbuff[entry] = NULL;
1008         } else {
1009                 desc->des2 = dma_map_single(priv->device, skb->data,
1010                                         nopaged_len, DMA_TO_DEVICE);
1011                 desc->des3 = desc->des2 + BUF_SIZE_4KiB;
1012                 priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
1013                                                 csum_insertion);
1014         }
1015         return entry;
1016 }
1017
1018 /**
1019  *  stmmac_xmit:
1020  *  @skb : the socket buffer
1021  *  @dev : device pointer
1022  *  Description : Tx entry point of the driver.
1023  */
1024 static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
1025 {
1026         struct stmmac_priv *priv = netdev_priv(dev);
1027         unsigned int txsize = priv->dma_tx_size;
1028         unsigned int entry;
1029         int i, csum_insertion = 0;
1030         int nfrags = skb_shinfo(skb)->nr_frags;
1031         struct dma_desc *desc, *first;
1032
1033         if (unlikely(stmmac_tx_avail(priv) < nfrags + 1)) {
1034                 if (!netif_queue_stopped(dev)) {
1035                         netif_stop_queue(dev);
1036                         /* This is a hard error, log it. */
1037                         pr_err("%s: BUG! Tx Ring full when queue awake\n",
1038                                 __func__);
1039                 }
1040                 return NETDEV_TX_BUSY;
1041         }
1042
1043         entry = priv->cur_tx % txsize;
1044
1045 #ifdef STMMAC_XMIT_DEBUG
1046         if ((skb->len > ETH_FRAME_LEN) || nfrags)
1047                 pr_info("stmmac xmit:\n"
1048                        "\tskb addr %p - len: %d - nopaged_len: %d\n"
1049                        "\tn_frags: %d - ip_summed: %d - %s gso\n",
1050                        skb, skb->len, skb_headlen(skb), nfrags, skb->ip_summed,
1051                        !skb_is_gso(skb) ? "isn't" : "is");
1052 #endif
1053
1054         if (unlikely(skb_is_gso(skb)))
1055                 return stmmac_sw_tso(priv, skb);
1056
1057         if (likely((skb->ip_summed == CHECKSUM_PARTIAL))) {
1058                 if (unlikely((!priv->plat->tx_coe) ||
1059                              (priv->no_csum_insertion)))
1060                         skb_checksum_help(skb);
1061                 else
1062                         csum_insertion = 1;
1063         }
1064
1065         desc = priv->dma_tx + entry;
1066         first = desc;
1067
1068 #ifdef STMMAC_XMIT_DEBUG
1069         if ((nfrags > 0) || (skb->len > ETH_FRAME_LEN))
1070                 pr_debug("stmmac xmit: skb len: %d, nopaged_len: %d,\n"
1071                        "\t\tn_frags: %d, ip_summed: %d\n",
1072                        skb->len, skb_headlen(skb), nfrags, skb->ip_summed);
1073 #endif
1074         priv->tx_skbuff[entry] = skb;
1075         if (unlikely(skb->len >= BUF_SIZE_4KiB)) {
1076                 entry = stmmac_handle_jumbo_frames(skb, dev, csum_insertion);
1077                 desc = priv->dma_tx + entry;
1078         } else {
1079                 unsigned int nopaged_len = skb_headlen(skb);
1080                 desc->des2 = dma_map_single(priv->device, skb->data,
1081                                         nopaged_len, DMA_TO_DEVICE);
1082                 priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
1083                                                 csum_insertion);
1084         }
1085
1086         for (i = 0; i < nfrags; i++) {
1087                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1088                 int len = frag->size;
1089
1090                 entry = (++priv->cur_tx) % txsize;
1091                 desc = priv->dma_tx + entry;
1092
1093                 TX_DBG("\t[entry %d] segment len: %d\n", entry, len);
1094                 desc->des2 = dma_map_page(priv->device, frag->page,
1095                                           frag->page_offset,
1096                                           len, DMA_TO_DEVICE);
1097                 priv->tx_skbuff[entry] = NULL;
1098                 priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion);
1099                 priv->hw->desc->set_tx_owner(desc);
1100         }
1101
1102         /* Interrupt on completition only for the latest segment */
1103         priv->hw->desc->close_tx_desc(desc);
1104
1105 #ifdef CONFIG_STMMAC_TIMER
1106         /* Clean IC while using timer */
1107         if (likely(priv->tm->enable))
1108                 priv->hw->desc->clear_tx_ic(desc);
1109 #endif
1110         /* To avoid raise condition */
1111         priv->hw->desc->set_tx_owner(first);
1112
1113         priv->cur_tx++;
1114
1115 #ifdef STMMAC_XMIT_DEBUG
1116         if (netif_msg_pktdata(priv)) {
1117                 pr_info("stmmac xmit: current=%d, dirty=%d, entry=%d, "
1118                        "first=%p, nfrags=%d\n",
1119                        (priv->cur_tx % txsize), (priv->dirty_tx % txsize),
1120                        entry, first, nfrags);
1121                 display_ring(priv->dma_tx, txsize);
1122                 pr_info(">>> frame to be transmitted: ");
1123                 print_pkt(skb->data, skb->len);
1124         }
1125 #endif
1126         if (unlikely(stmmac_tx_avail(priv) <= (MAX_SKB_FRAGS + 1))) {
1127                 TX_DBG("%s: stop transmitted packets\n", __func__);
1128                 netif_stop_queue(dev);
1129         }
1130
1131         dev->stats.tx_bytes += skb->len;
1132
1133         priv->hw->dma->enable_dma_transmission(priv->ioaddr);
1134
1135         return NETDEV_TX_OK;
1136 }
1137
1138 static inline void stmmac_rx_refill(struct stmmac_priv *priv)
1139 {
1140         unsigned int rxsize = priv->dma_rx_size;
1141         int bfsize = priv->dma_buf_sz;
1142         struct dma_desc *p = priv->dma_rx;
1143
1144         for (; priv->cur_rx - priv->dirty_rx > 0; priv->dirty_rx++) {
1145                 unsigned int entry = priv->dirty_rx % rxsize;
1146                 if (likely(priv->rx_skbuff[entry] == NULL)) {
1147                         struct sk_buff *skb;
1148
1149                         skb = __skb_dequeue(&priv->rx_recycle);
1150                         if (skb == NULL)
1151                                 skb = netdev_alloc_skb_ip_align(priv->dev,
1152                                                                 bfsize);
1153
1154                         if (unlikely(skb == NULL))
1155                                 break;
1156
1157                         priv->rx_skbuff[entry] = skb;
1158                         priv->rx_skbuff_dma[entry] =
1159                             dma_map_single(priv->device, skb->data, bfsize,
1160                                            DMA_FROM_DEVICE);
1161
1162                         (p + entry)->des2 = priv->rx_skbuff_dma[entry];
1163                         if (unlikely(priv->plat->has_gmac)) {
1164                                 if (bfsize >= BUF_SIZE_8KiB)
1165                                         (p + entry)->des3 =
1166                                             (p + entry)->des2 + BUF_SIZE_8KiB;
1167                         }
1168                         RX_DBG(KERN_INFO "\trefill entry #%d\n", entry);
1169                 }
1170                 priv->hw->desc->set_rx_owner(p + entry);
1171         }
1172 }
1173
1174 static int stmmac_rx(struct stmmac_priv *priv, int limit)
1175 {
1176         unsigned int rxsize = priv->dma_rx_size;
1177         unsigned int entry = priv->cur_rx % rxsize;
1178         unsigned int next_entry;
1179         unsigned int count = 0;
1180         struct dma_desc *p = priv->dma_rx + entry;
1181         struct dma_desc *p_next;
1182
1183 #ifdef STMMAC_RX_DEBUG
1184         if (netif_msg_hw(priv)) {
1185                 pr_debug(">>> stmmac_rx: descriptor ring:\n");
1186                 display_ring(priv->dma_rx, rxsize);
1187         }
1188 #endif
1189         count = 0;
1190         while (!priv->hw->desc->get_rx_owner(p)) {
1191                 int status;
1192
1193                 if (count >= limit)
1194                         break;
1195
1196                 count++;
1197
1198                 next_entry = (++priv->cur_rx) % rxsize;
1199                 p_next = priv->dma_rx + next_entry;
1200                 prefetch(p_next);
1201
1202                 /* read the status of the incoming frame */
1203                 status = (priv->hw->desc->rx_status(&priv->dev->stats,
1204                                                     &priv->xstats, p));
1205                 if (unlikely(status == discard_frame))
1206                         priv->dev->stats.rx_errors++;
1207                 else {
1208                         struct sk_buff *skb;
1209                         int frame_len;
1210
1211                         frame_len = priv->hw->desc->get_rx_frame_len(p);
1212                         /* ACS is set; GMAC core strips PAD/FCS for IEEE 802.3
1213                          * Type frames (LLC/LLC-SNAP) */
1214                         if (unlikely(status != llc_snap))
1215                                 frame_len -= ETH_FCS_LEN;
1216 #ifdef STMMAC_RX_DEBUG
1217                         if (frame_len > ETH_FRAME_LEN)
1218                                 pr_debug("\tRX frame size %d, COE status: %d\n",
1219                                         frame_len, status);
1220
1221                         if (netif_msg_hw(priv))
1222                                 pr_debug("\tdesc: %p [entry %d] buff=0x%x\n",
1223                                         p, entry, p->des2);
1224 #endif
1225                         skb = priv->rx_skbuff[entry];
1226                         if (unlikely(!skb)) {
1227                                 pr_err("%s: Inconsistent Rx descriptor chain\n",
1228                                         priv->dev->name);
1229                                 priv->dev->stats.rx_dropped++;
1230                                 break;
1231                         }
1232                         prefetch(skb->data - NET_IP_ALIGN);
1233                         priv->rx_skbuff[entry] = NULL;
1234
1235                         skb_put(skb, frame_len);
1236                         dma_unmap_single(priv->device,
1237                                          priv->rx_skbuff_dma[entry],
1238                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
1239 #ifdef STMMAC_RX_DEBUG
1240                         if (netif_msg_pktdata(priv)) {
1241                                 pr_info(" frame received (%dbytes)", frame_len);
1242                                 print_pkt(skb->data, frame_len);
1243                         }
1244 #endif
1245                         skb->protocol = eth_type_trans(skb, priv->dev);
1246
1247                         if (unlikely(status == csum_none)) {
1248                                 /* always for the old mac 10/100 */
1249                                 skb_checksum_none_assert(skb);
1250                                 netif_receive_skb(skb);
1251                         } else {
1252                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1253                                 napi_gro_receive(&priv->napi, skb);
1254                         }
1255
1256                         priv->dev->stats.rx_packets++;
1257                         priv->dev->stats.rx_bytes += frame_len;
1258                 }
1259                 entry = next_entry;
1260                 p = p_next;     /* use prefetched values */
1261         }
1262
1263         stmmac_rx_refill(priv);
1264
1265         priv->xstats.rx_pkt_n += count;
1266
1267         return count;
1268 }
1269
1270 /**
1271  *  stmmac_poll - stmmac poll method (NAPI)
1272  *  @napi : pointer to the napi structure.
1273  *  @budget : maximum number of packets that the current CPU can receive from
1274  *            all interfaces.
1275  *  Description :
1276  *   This function implements the the reception process.
1277  *   Also it runs the TX completion thread
1278  */
1279 static int stmmac_poll(struct napi_struct *napi, int budget)
1280 {
1281         struct stmmac_priv *priv = container_of(napi, struct stmmac_priv, napi);
1282         int work_done = 0;
1283
1284         priv->xstats.poll_n++;
1285         stmmac_tx(priv);
1286         work_done = stmmac_rx(priv, budget);
1287
1288         if (work_done < budget) {
1289                 napi_complete(napi);
1290                 stmmac_enable_irq(priv);
1291         }
1292         return work_done;
1293 }
1294
1295 /**
1296  *  stmmac_tx_timeout
1297  *  @dev : Pointer to net device structure
1298  *  Description: this function is called when a packet transmission fails to
1299  *   complete within a reasonable tmrate. The driver will mark the error in the
1300  *   netdev structure and arrange for the device to be reset to a sane state
1301  *   in order to transmit a new packet.
1302  */
1303 static void stmmac_tx_timeout(struct net_device *dev)
1304 {
1305         struct stmmac_priv *priv = netdev_priv(dev);
1306
1307         /* Clear Tx resources and restart transmitting again */
1308         stmmac_tx_err(priv);
1309 }
1310
1311 /* Configuration changes (passed on by ifconfig) */
1312 static int stmmac_config(struct net_device *dev, struct ifmap *map)
1313 {
1314         if (dev->flags & IFF_UP)        /* can't act on a running interface */
1315                 return -EBUSY;
1316
1317         /* Don't allow changing the I/O address */
1318         if (map->base_addr != dev->base_addr) {
1319                 pr_warning("%s: can't change I/O address\n", dev->name);
1320                 return -EOPNOTSUPP;
1321         }
1322
1323         /* Don't allow changing the IRQ */
1324         if (map->irq != dev->irq) {
1325                 pr_warning("%s: can't change IRQ number %d\n",
1326                        dev->name, dev->irq);
1327                 return -EOPNOTSUPP;
1328         }
1329
1330         /* ignore other fields */
1331         return 0;
1332 }
1333
1334 /**
1335  *  stmmac_multicast_list - entry point for multicast addressing
1336  *  @dev : pointer to the device structure
1337  *  Description:
1338  *  This function is a driver entry point which gets called by the kernel
1339  *  whenever multicast addresses must be enabled/disabled.
1340  *  Return value:
1341  *  void.
1342  */
1343 static void stmmac_multicast_list(struct net_device *dev)
1344 {
1345         struct stmmac_priv *priv = netdev_priv(dev);
1346
1347         spin_lock(&priv->lock);
1348         priv->hw->mac->set_filter(dev);
1349         spin_unlock(&priv->lock);
1350 }
1351
1352 /**
1353  *  stmmac_change_mtu - entry point to change MTU size for the device.
1354  *  @dev : device pointer.
1355  *  @new_mtu : the new MTU size for the device.
1356  *  Description: the Maximum Transfer Unit (MTU) is used by the network layer
1357  *  to drive packet transmission. Ethernet has an MTU of 1500 octets
1358  *  (ETH_DATA_LEN). This value can be changed with ifconfig.
1359  *  Return value:
1360  *  0 on success and an appropriate (-)ve integer as defined in errno.h
1361  *  file on failure.
1362  */
1363 static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
1364 {
1365         struct stmmac_priv *priv = netdev_priv(dev);
1366         int max_mtu;
1367
1368         if (netif_running(dev)) {
1369                 pr_err("%s: must be stopped to change its MTU\n", dev->name);
1370                 return -EBUSY;
1371         }
1372
1373         if (priv->plat->has_gmac)
1374                 max_mtu = JUMBO_LEN;
1375         else
1376                 max_mtu = ETH_DATA_LEN;
1377
1378         if ((new_mtu < 46) || (new_mtu > max_mtu)) {
1379                 pr_err("%s: invalid MTU, max MTU is: %d\n", dev->name, max_mtu);
1380                 return -EINVAL;
1381         }
1382
1383         /* Some GMAC devices have a bugged Jumbo frame support that
1384          * needs to have the Tx COE disabled for oversized frames
1385          * (due to limited buffer sizes). In this case we disable
1386          * the TX csum insertionin the TDES and not use SF. */
1387         if ((priv->plat->bugged_jumbo) && (priv->dev->mtu > ETH_DATA_LEN))
1388                 priv->no_csum_insertion = 1;
1389         else
1390                 priv->no_csum_insertion = 0;
1391
1392         dev->mtu = new_mtu;
1393
1394         return 0;
1395 }
1396
1397 static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
1398 {
1399         struct net_device *dev = (struct net_device *)dev_id;
1400         struct stmmac_priv *priv = netdev_priv(dev);
1401
1402         if (unlikely(!dev)) {
1403                 pr_err("%s: invalid dev pointer\n", __func__);
1404                 return IRQ_NONE;
1405         }
1406
1407         if (priv->plat->has_gmac)
1408                 /* To handle GMAC own interrupts */
1409                 priv->hw->mac->host_irq_status((void __iomem *) dev->base_addr);
1410
1411         stmmac_dma_interrupt(priv);
1412
1413         return IRQ_HANDLED;
1414 }
1415
1416 #ifdef CONFIG_NET_POLL_CONTROLLER
1417 /* Polling receive - used by NETCONSOLE and other diagnostic tools
1418  * to allow network I/O with interrupts disabled. */
1419 static void stmmac_poll_controller(struct net_device *dev)
1420 {
1421         disable_irq(dev->irq);
1422         stmmac_interrupt(dev->irq, dev);
1423         enable_irq(dev->irq);
1424 }
1425 #endif
1426
1427 /**
1428  *  stmmac_ioctl - Entry point for the Ioctl
1429  *  @dev: Device pointer.
1430  *  @rq: An IOCTL specefic structure, that can contain a pointer to
1431  *  a proprietary structure used to pass information to the driver.
1432  *  @cmd: IOCTL command
1433  *  Description:
1434  *  Currently there are no special functionality supported in IOCTL, just the
1435  *  phy_mii_ioctl(...) can be invoked.
1436  */
1437 static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1438 {
1439         struct stmmac_priv *priv = netdev_priv(dev);
1440         int ret;
1441
1442         if (!netif_running(dev))
1443                 return -EINVAL;
1444
1445         if (!priv->phydev)
1446                 return -EINVAL;
1447
1448         spin_lock(&priv->lock);
1449         ret = phy_mii_ioctl(priv->phydev, rq, cmd);
1450         spin_unlock(&priv->lock);
1451
1452         return ret;
1453 }
1454
1455 #ifdef STMMAC_VLAN_TAG_USED
1456 static void stmmac_vlan_rx_register(struct net_device *dev,
1457                                     struct vlan_group *grp)
1458 {
1459         struct stmmac_priv *priv = netdev_priv(dev);
1460
1461         DBG(probe, INFO, "%s: Setting vlgrp to %p\n", dev->name, grp);
1462
1463         spin_lock(&priv->lock);
1464         priv->vlgrp = grp;
1465         spin_unlock(&priv->lock);
1466 }
1467 #endif
1468
1469 static const struct net_device_ops stmmac_netdev_ops = {
1470         .ndo_open = stmmac_open,
1471         .ndo_start_xmit = stmmac_xmit,
1472         .ndo_stop = stmmac_release,
1473         .ndo_change_mtu = stmmac_change_mtu,
1474         .ndo_set_multicast_list = stmmac_multicast_list,
1475         .ndo_tx_timeout = stmmac_tx_timeout,
1476         .ndo_do_ioctl = stmmac_ioctl,
1477         .ndo_set_config = stmmac_config,
1478 #ifdef STMMAC_VLAN_TAG_USED
1479         .ndo_vlan_rx_register = stmmac_vlan_rx_register,
1480 #endif
1481 #ifdef CONFIG_NET_POLL_CONTROLLER
1482         .ndo_poll_controller = stmmac_poll_controller,
1483 #endif
1484         .ndo_set_mac_address = eth_mac_addr,
1485 };
1486
1487 /**
1488  * stmmac_probe - Initialization of the adapter .
1489  * @dev : device pointer
1490  * Description: The function initializes the network device structure for
1491  * the STMMAC driver. It also calls the low level routines
1492  * in order to init the HW (i.e. the DMA engine)
1493  */
1494 static int stmmac_probe(struct net_device *dev)
1495 {
1496         int ret = 0;
1497         struct stmmac_priv *priv = netdev_priv(dev);
1498
1499         ether_setup(dev);
1500
1501         dev->netdev_ops = &stmmac_netdev_ops;
1502         stmmac_set_ethtool_ops(dev);
1503
1504         dev->features |= NETIF_F_SG | NETIF_F_HIGHDMA |
1505                 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1506         dev->watchdog_timeo = msecs_to_jiffies(watchdog);
1507 #ifdef STMMAC_VLAN_TAG_USED
1508         /* Both mac100 and gmac support receive VLAN tag detection */
1509         dev->features |= NETIF_F_HW_VLAN_RX;
1510 #endif
1511         priv->msg_enable = netif_msg_init(debug, default_msg_level);
1512
1513         if (flow_ctrl)
1514                 priv->flow_ctrl = FLOW_AUTO;    /* RX/TX pause on */
1515
1516         priv->pause = pause;
1517         netif_napi_add(dev, &priv->napi, stmmac_poll, 64);
1518
1519         /* Get the MAC address */
1520         priv->hw->mac->get_umac_addr((void __iomem *) dev->base_addr,
1521                                      dev->dev_addr, 0);
1522
1523         if (!is_valid_ether_addr(dev->dev_addr))
1524                 pr_warning("\tno valid MAC address;"
1525                         "please, use ifconfig or nwhwconfig!\n");
1526
1527         spin_lock_init(&priv->lock);
1528
1529         ret = register_netdev(dev);
1530         if (ret) {
1531                 pr_err("%s: ERROR %i registering the device\n",
1532                        __func__, ret);
1533                 return -ENODEV;
1534         }
1535
1536         DBG(probe, DEBUG, "%s: Scatter/Gather: %s - HW checksums: %s\n",
1537             dev->name, (dev->features & NETIF_F_SG) ? "on" : "off",
1538             (dev->features & NETIF_F_IP_CSUM) ? "on" : "off");
1539
1540         return ret;
1541 }
1542
1543 /**
1544  * stmmac_mac_device_setup
1545  * @dev : device pointer
1546  * Description: select and initialise the mac device (mac100 or Gmac).
1547  */
1548 static int stmmac_mac_device_setup(struct net_device *dev)
1549 {
1550         struct stmmac_priv *priv = netdev_priv(dev);
1551
1552         struct mac_device_info *device;
1553
1554         if (priv->plat->has_gmac)
1555                 device = dwmac1000_setup(priv->ioaddr);
1556         else
1557                 device = dwmac100_setup(priv->ioaddr);
1558
1559         if (!device)
1560                 return -ENOMEM;
1561
1562         if (priv->plat->enh_desc) {
1563                 device->desc = &enh_desc_ops;
1564                 pr_info("\tEnhanced descriptor structure\n");
1565         } else
1566                 device->desc = &ndesc_ops;
1567
1568         priv->hw = device;
1569
1570         if (device_can_wakeup(priv->device)) {
1571                 priv->wolopts = WAKE_MAGIC; /* Magic Frame as default */
1572                 enable_irq_wake(dev->irq);
1573         }
1574
1575         return 0;
1576 }
1577
1578 static int stmmacphy_dvr_probe(struct platform_device *pdev)
1579 {
1580         struct plat_stmmacphy_data *plat_dat = pdev->dev.platform_data;
1581
1582         pr_debug("stmmacphy_dvr_probe: added phy for bus %d\n",
1583                plat_dat->bus_id);
1584
1585         return 0;
1586 }
1587
1588 static int stmmacphy_dvr_remove(struct platform_device *pdev)
1589 {
1590         return 0;
1591 }
1592
1593 static struct platform_driver stmmacphy_driver = {
1594         .driver = {
1595                    .name = PHY_RESOURCE_NAME,
1596                    },
1597         .probe = stmmacphy_dvr_probe,
1598         .remove = stmmacphy_dvr_remove,
1599 };
1600
1601 /**
1602  * stmmac_associate_phy
1603  * @dev: pointer to device structure
1604  * @data: points to the private structure.
1605  * Description: Scans through all the PHYs we have registered and checks if
1606  * any are associated with our MAC.  If so, then just fill in
1607  * the blanks in our local context structure
1608  */
1609 static int stmmac_associate_phy(struct device *dev, void *data)
1610 {
1611         struct stmmac_priv *priv = (struct stmmac_priv *)data;
1612         struct plat_stmmacphy_data *plat_dat = dev->platform_data;
1613
1614         DBG(probe, DEBUG, "%s: checking phy for bus %d\n", __func__,
1615                 plat_dat->bus_id);
1616
1617         /* Check that this phy is for the MAC being initialised */
1618         if (priv->plat->bus_id != plat_dat->bus_id)
1619                 return 0;
1620
1621         /* OK, this PHY is connected to the MAC.
1622            Go ahead and get the parameters */
1623         DBG(probe, DEBUG, "%s: OK. Found PHY config\n", __func__);
1624         priv->phy_irq =
1625             platform_get_irq_byname(to_platform_device(dev), "phyirq");
1626         DBG(probe, DEBUG, "%s: PHY irq on bus %d is %d\n", __func__,
1627             plat_dat->bus_id, priv->phy_irq);
1628
1629         /* Override with kernel parameters if supplied XXX CRS XXX
1630          * this needs to have multiple instances */
1631         if ((phyaddr >= 0) && (phyaddr <= 31))
1632                 plat_dat->phy_addr = phyaddr;
1633
1634         priv->phy_addr = plat_dat->phy_addr;
1635         priv->phy_mask = plat_dat->phy_mask;
1636         priv->phy_interface = plat_dat->interface;
1637         priv->phy_reset = plat_dat->phy_reset;
1638
1639         DBG(probe, DEBUG, "%s: exiting\n", __func__);
1640         return 1;       /* forces exit of driver_for_each_device() */
1641 }
1642
1643 /**
1644  * stmmac_dvr_probe
1645  * @pdev: platform device pointer
1646  * Description: the driver is initialized through platform_device.
1647  */
1648 static int stmmac_dvr_probe(struct platform_device *pdev)
1649 {
1650         int ret = 0;
1651         struct resource *res;
1652         void __iomem *addr = NULL;
1653         struct net_device *ndev = NULL;
1654         struct stmmac_priv *priv = NULL;
1655         struct plat_stmmacenet_data *plat_dat;
1656
1657         pr_info("STMMAC driver:\n\tplatform registration... ");
1658         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1659         if (!res)
1660                 return -ENODEV;
1661         pr_info("\tdone!\n");
1662
1663         if (!request_mem_region(res->start, resource_size(res),
1664                                 pdev->name)) {
1665                 pr_err("%s: ERROR: memory allocation failed"
1666                        "cannot get the I/O addr 0x%x\n",
1667                        __func__, (unsigned int)res->start);
1668                 return -EBUSY;
1669         }
1670
1671         addr = ioremap(res->start, resource_size(res));
1672         if (!addr) {
1673                 pr_err("%s: ERROR: memory mapping failed\n", __func__);
1674                 ret = -ENOMEM;
1675                 goto out_release_region;
1676         }
1677
1678         ndev = alloc_etherdev(sizeof(struct stmmac_priv));
1679         if (!ndev) {
1680                 pr_err("%s: ERROR: allocating the device\n", __func__);
1681                 ret = -ENOMEM;
1682                 goto out_unmap;
1683         }
1684
1685         SET_NETDEV_DEV(ndev, &pdev->dev);
1686
1687         /* Get the MAC information */
1688         ndev->irq = platform_get_irq_byname(pdev, "macirq");
1689         if (ndev->irq == -ENXIO) {
1690                 pr_err("%s: ERROR: MAC IRQ configuration "
1691                        "information not found\n", __func__);
1692                 ret = -ENXIO;
1693                 goto out_free_ndev;
1694         }
1695
1696         priv = netdev_priv(ndev);
1697         priv->device = &(pdev->dev);
1698         priv->dev = ndev;
1699         plat_dat = pdev->dev.platform_data;
1700
1701         priv->plat = plat_dat;
1702
1703         priv->ioaddr = addr;
1704
1705         /* PMT module is not integrated in all the MAC devices. */
1706         if (plat_dat->pmt) {
1707                 pr_info("\tPMT module supported\n");
1708                 device_set_wakeup_capable(&pdev->dev, 1);
1709         }
1710
1711         platform_set_drvdata(pdev, ndev);
1712
1713         /* Set the I/O base addr */
1714         ndev->base_addr = (unsigned long)addr;
1715
1716         /* Custom initialisation */
1717         if (priv->plat->init) {
1718                 ret = priv->plat->init(pdev);
1719                 if (unlikely(ret))
1720                         goto out_free_ndev;
1721         }
1722
1723         /* MAC HW revice detection */
1724         ret = stmmac_mac_device_setup(ndev);
1725         if (ret < 0)
1726                 goto out_plat_exit;
1727
1728         /* Network Device Registration */
1729         ret = stmmac_probe(ndev);
1730         if (ret < 0)
1731                 goto out_plat_exit;
1732
1733         /* associate a PHY - it is provided by another platform bus */
1734         if (!driver_for_each_device
1735             (&(stmmacphy_driver.driver), NULL, (void *)priv,
1736              stmmac_associate_phy)) {
1737                 pr_err("No PHY device is associated with this MAC!\n");
1738                 ret = -ENODEV;
1739                 goto out_unregister;
1740         }
1741
1742         pr_info("\t%s - (dev. name: %s - id: %d, IRQ #%d\n"
1743                "\tIO base addr: 0x%p)\n", ndev->name, pdev->name,
1744                pdev->id, ndev->irq, addr);
1745
1746         /* MDIO bus Registration */
1747         pr_debug("\tMDIO bus (id: %d)...", priv->plat->bus_id);
1748         ret = stmmac_mdio_register(ndev);
1749         if (ret < 0)
1750                 goto out_unregister;
1751         pr_debug("registered!\n");
1752         return 0;
1753
1754 out_unregister:
1755         unregister_netdev(ndev);
1756 out_plat_exit:
1757         if (priv->plat->exit)
1758                 priv->plat->exit(pdev);
1759 out_free_ndev:
1760         free_netdev(ndev);
1761         platform_set_drvdata(pdev, NULL);
1762 out_unmap:
1763         iounmap(addr);
1764 out_release_region:
1765         release_mem_region(res->start, resource_size(res));
1766
1767         return ret;
1768 }
1769
1770 /**
1771  * stmmac_dvr_remove
1772  * @pdev: platform device pointer
1773  * Description: this function resets the TX/RX processes, disables the MAC RX/TX
1774  * changes the link status, releases the DMA descriptor rings,
1775  * unregisters the MDIO bus and unmaps the allocated memory.
1776  */
1777 static int stmmac_dvr_remove(struct platform_device *pdev)
1778 {
1779         struct net_device *ndev = platform_get_drvdata(pdev);
1780         struct stmmac_priv *priv = netdev_priv(ndev);
1781         struct resource *res;
1782
1783         pr_info("%s:\n\tremoving driver", __func__);
1784
1785         priv->hw->dma->stop_rx(priv->ioaddr);
1786         priv->hw->dma->stop_tx(priv->ioaddr);
1787
1788         stmmac_disable_mac(priv->ioaddr);
1789
1790         netif_carrier_off(ndev);
1791
1792         stmmac_mdio_unregister(ndev);
1793
1794         if (priv->plat->exit)
1795                 priv->plat->exit(pdev);
1796
1797         platform_set_drvdata(pdev, NULL);
1798         unregister_netdev(ndev);
1799
1800         iounmap((void *)priv->ioaddr);
1801         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1802         release_mem_region(res->start, resource_size(res));
1803
1804         free_netdev(ndev);
1805
1806         return 0;
1807 }
1808
1809 #ifdef CONFIG_PM
1810 static int stmmac_suspend(struct device *dev)
1811 {
1812         struct net_device *ndev = dev_get_drvdata(dev);
1813         struct stmmac_priv *priv = netdev_priv(ndev);
1814         int dis_ic = 0;
1815
1816         if (!ndev || !netif_running(ndev))
1817                 return 0;
1818
1819         spin_lock(&priv->lock);
1820
1821         netif_device_detach(ndev);
1822         netif_stop_queue(ndev);
1823         if (priv->phydev)
1824                 phy_stop(priv->phydev);
1825
1826 #ifdef CONFIG_STMMAC_TIMER
1827         priv->tm->timer_stop();
1828         if (likely(priv->tm->enable))
1829                 dis_ic = 1;
1830 #endif
1831         napi_disable(&priv->napi);
1832
1833         /* Stop TX/RX DMA */
1834         priv->hw->dma->stop_tx(priv->ioaddr);
1835         priv->hw->dma->stop_rx(priv->ioaddr);
1836         /* Clear the Rx/Tx descriptors */
1837         priv->hw->desc->init_rx_desc(priv->dma_rx, priv->dma_rx_size,
1838                                      dis_ic);
1839         priv->hw->desc->init_tx_desc(priv->dma_tx, priv->dma_tx_size);
1840
1841         /* Enable Power down mode by programming the PMT regs */
1842         if (device_may_wakeup(priv->device))
1843                 priv->hw->mac->pmt(priv->ioaddr, priv->wolopts);
1844         else
1845                 stmmac_disable_mac(priv->ioaddr);
1846
1847         spin_unlock(&priv->lock);
1848         return 0;
1849 }
1850
1851 static int stmmac_resume(struct device *dev)
1852 {
1853         struct net_device *ndev = dev_get_drvdata(dev);
1854         struct stmmac_priv *priv = netdev_priv(ndev);
1855
1856         if (!netif_running(ndev))
1857                 return 0;
1858
1859         spin_lock(&priv->lock);
1860
1861         /* Power Down bit, into the PM register, is cleared
1862          * automatically as soon as a magic packet or a Wake-up frame
1863          * is received. Anyway, it's better to manually clear
1864          * this bit because it can generate problems while resuming
1865          * from another devices (e.g. serial console). */
1866         if (device_may_wakeup(priv->device))
1867                 priv->hw->mac->pmt(priv->ioaddr, 0);
1868
1869         netif_device_attach(ndev);
1870
1871         /* Enable the MAC and DMA */
1872         stmmac_enable_mac(priv->ioaddr);
1873         priv->hw->dma->start_tx(priv->ioaddr);
1874         priv->hw->dma->start_rx(priv->ioaddr);
1875
1876 #ifdef CONFIG_STMMAC_TIMER
1877         if (likely(priv->tm->enable))
1878                 priv->tm->timer_start(tmrate);
1879 #endif
1880         napi_enable(&priv->napi);
1881
1882         if (priv->phydev)
1883                 phy_start(priv->phydev);
1884
1885         netif_start_queue(ndev);
1886
1887         spin_unlock(&priv->lock);
1888         return 0;
1889 }
1890
1891 static int stmmac_freeze(struct device *dev)
1892 {
1893         struct net_device *ndev = dev_get_drvdata(dev);
1894
1895         if (!ndev || !netif_running(ndev))
1896                 return 0;
1897
1898         return stmmac_release(ndev);
1899 }
1900
1901 static int stmmac_restore(struct device *dev)
1902 {
1903         struct net_device *ndev = dev_get_drvdata(dev);
1904
1905         if (!ndev || !netif_running(ndev))
1906                 return 0;
1907
1908         return stmmac_open(ndev);
1909 }
1910
1911 static const struct dev_pm_ops stmmac_pm_ops = {
1912         .suspend = stmmac_suspend,
1913         .resume = stmmac_resume,
1914         .freeze = stmmac_freeze,
1915         .thaw = stmmac_restore,
1916         .restore = stmmac_restore,
1917 };
1918 #else
1919 static const struct dev_pm_ops stmmac_pm_ops;
1920 #endif /* CONFIG_PM */
1921
1922 static struct platform_driver stmmac_driver = {
1923         .probe = stmmac_dvr_probe,
1924         .remove = stmmac_dvr_remove,
1925         .driver = {
1926                 .name = STMMAC_RESOURCE_NAME,
1927                 .owner = THIS_MODULE,
1928                 .pm = &stmmac_pm_ops,
1929         },
1930 };
1931
1932 /**
1933  * stmmac_init_module - Entry point for the driver
1934  * Description: This function is the entry point for the driver.
1935  */
1936 static int __init stmmac_init_module(void)
1937 {
1938         int ret;
1939
1940         if (platform_driver_register(&stmmacphy_driver)) {
1941                 pr_err("No PHY devices registered!\n");
1942                 return -ENODEV;
1943         }
1944
1945         ret = platform_driver_register(&stmmac_driver);
1946         return ret;
1947 }
1948
1949 /**
1950  * stmmac_cleanup_module - Cleanup routine for the driver
1951  * Description: This function is the cleanup routine for the driver.
1952  */
1953 static void __exit stmmac_cleanup_module(void)
1954 {
1955         platform_driver_unregister(&stmmacphy_driver);
1956         platform_driver_unregister(&stmmac_driver);
1957 }
1958
1959 #ifndef MODULE
1960 static int __init stmmac_cmdline_opt(char *str)
1961 {
1962         char *opt;
1963
1964         if (!str || !*str)
1965                 return -EINVAL;
1966         while ((opt = strsep(&str, ",")) != NULL) {
1967                 if (!strncmp(opt, "debug:", 6))
1968                         strict_strtoul(opt + 6, 0, (unsigned long *)&debug);
1969                 else if (!strncmp(opt, "phyaddr:", 8))
1970                         strict_strtoul(opt + 8, 0, (unsigned long *)&phyaddr);
1971                 else if (!strncmp(opt, "dma_txsize:", 11))
1972                         strict_strtoul(opt + 11, 0,
1973                                        (unsigned long *)&dma_txsize);
1974                 else if (!strncmp(opt, "dma_rxsize:", 11))
1975                         strict_strtoul(opt + 11, 0,
1976                                        (unsigned long *)&dma_rxsize);
1977                 else if (!strncmp(opt, "buf_sz:", 7))
1978                         strict_strtoul(opt + 7, 0, (unsigned long *)&buf_sz);
1979                 else if (!strncmp(opt, "tc:", 3))
1980                         strict_strtoul(opt + 3, 0, (unsigned long *)&tc);
1981                 else if (!strncmp(opt, "watchdog:", 9))
1982                         strict_strtoul(opt + 9, 0, (unsigned long *)&watchdog);
1983                 else if (!strncmp(opt, "flow_ctrl:", 10))
1984                         strict_strtoul(opt + 10, 0,
1985                                        (unsigned long *)&flow_ctrl);
1986                 else if (!strncmp(opt, "pause:", 6))
1987                         strict_strtoul(opt + 6, 0, (unsigned long *)&pause);
1988 #ifdef CONFIG_STMMAC_TIMER
1989                 else if (!strncmp(opt, "tmrate:", 7))
1990                         strict_strtoul(opt + 7, 0, (unsigned long *)&tmrate);
1991 #endif
1992         }
1993         return 0;
1994 }
1995
1996 __setup("stmmaceth=", stmmac_cmdline_opt);
1997 #endif
1998
1999 module_init(stmmac_init_module);
2000 module_exit(stmmac_cleanup_module);
2001
2002 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet driver");
2003 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
2004 MODULE_LICENSE("GPL");