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/clk.h>
  32 #include <linux/kernel.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/ip.h>
  35 #include <linux/tcp.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/ethtool.h>
  38 #include <linux/if_ether.h>
  39 #include <linux/crc32.h>
  40 #include <linux/mii.h>
  41 #include <linux/if.h>
  42 #include <linux/if_vlan.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/slab.h>
  45 #include <linux/prefetch.h>
  46 #ifdef CONFIG_STMMAC_DEBUG_FS
  47 #include <linux/debugfs.h>
  48 #include <linux/seq_file.h>
  49 #endif
  50 #include "stmmac.h"
  51
  52 #undef STMMAC_DEBUG
  53 /*#define STMMAC_DEBUG*/
  54 #ifdef STMMAC_DEBUG
  55 #define DBG(nlevel, klevel, fmt, args...) \
  56                 ((void)(netif_msg_##nlevel(priv) && \
  57                 printk(KERN_##klevel fmt, ## args)))
  58 #else
  59 #define DBG(nlevel, klevel, fmt, args...) do { } while (0)
  60 #endif
  61
  62 #undef STMMAC_RX_DEBUG
  63 /*#define STMMAC_RX_DEBUG*/
  64 #ifdef STMMAC_RX_DEBUG
  65 #define RX_DBG(fmt, args...)  printk(fmt, ## args)
  66 #else
  67 #define RX_DBG(fmt, args...)  do { } while (0)
  68 #endif
  69
  70 #undef STMMAC_XMIT_DEBUG
  71 /*#define STMMAC_XMIT_DEBUG*/
  72 #ifdef STMMAC_TX_DEBUG
  73 #define TX_DBG(fmt, args...)  printk(fmt, ## args)
  74 #else
  75 #define TX_DBG(fmt, args...)  do { } while (0)
  76 #endif
  77
  78 #define STMMAC_ALIGN(x) L1_CACHE_ALIGN(x)
  79 #define JUMBO_LEN       9000
  80
  81 /* Module parameters */
  82 #define TX_TIMEO 5000 /* default 5 seconds */
  83 static int watchdog = TX_TIMEO;
  84 module_param(watchdog, int, S_IRUGO | S_IWUSR);
  85 MODULE_PARM_DESC(watchdog, "Transmit timeout in milliseconds");
  86
  87 static int debug = -1;          /* -1: default, 0: no output, 16:  all */
  88 module_param(debug, int, S_IRUGO | S_IWUSR);
  89 MODULE_PARM_DESC(debug, "Message Level (0: no output, 16: all)");
  90
  91 int phyaddr = -1;
  92 module_param(phyaddr, int, S_IRUGO);
  93 MODULE_PARM_DESC(phyaddr, "Physical device address");
  94
  95 #define DMA_TX_SIZE 256
  96 static int dma_txsize = DMA_TX_SIZE;
  97 module_param(dma_txsize, int, S_IRUGO | S_IWUSR);
  98 MODULE_PARM_DESC(dma_txsize, "Number of descriptors in the TX list");
  99
 100 #define DMA_RX_SIZE 256
 101 static int dma_rxsize = DMA_RX_SIZE;
 102 module_param(dma_rxsize, int, S_IRUGO | S_IWUSR);
 103 MODULE_PARM_DESC(dma_rxsize, "Number of descriptors in the RX list");
 104
 105 static int flow_ctrl = FLOW_OFF;
 106 module_param(flow_ctrl, int, S_IRUGO | S_IWUSR);
 107 MODULE_PARM_DESC(flow_ctrl, "Flow control ability [on/off]");
 108
 109 static int pause = PAUSE_TIME;
 110 module_param(pause, int, S_IRUGO | S_IWUSR);
 111 MODULE_PARM_DESC(pause, "Flow Control Pause Time");
 112
 113 #define TC_DEFAULT 64
 114 static int tc = TC_DEFAULT;
 115 module_param(tc, int, S_IRUGO | S_IWUSR);
 116 MODULE_PARM_DESC(tc, "DMA threshold control value");
 117
 118 /* Pay attention to tune this parameter; take care of both
 119  * hardware capability and network stabitily/performance impact.
 120  * Many tests showed that ~4ms latency seems to be good enough. */
 121 #ifdef CONFIG_STMMAC_TIMER
 122 #define DEFAULT_PERIODIC_RATE   256
 123 static int tmrate = DEFAULT_PERIODIC_RATE;
 124 module_param(tmrate, int, S_IRUGO | S_IWUSR);
 125 MODULE_PARM_DESC(tmrate, "External timer freq. (default: 256Hz)");
 126 #endif
 127
 128 #define DMA_BUFFER_SIZE BUF_SIZE_2KiB
 129 static int buf_sz = DMA_BUFFER_SIZE;
 130 module_param(buf_sz, int, S_IRUGO | S_IWUSR);
 131 MODULE_PARM_DESC(buf_sz, "DMA buffer size");
 132
 133 static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
 134                                       NETIF_MSG_LINK | NETIF_MSG_IFUP |
 135                                       NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);
 136
 137 #define STMMAC_DEFAULT_LPI_TIMER        1000
 138 static int eee_timer = STMMAC_DEFAULT_LPI_TIMER;
 139 module_param(eee_timer, int, S_IRUGO | S_IWUSR);
 140 MODULE_PARM_DESC(eee_timer, "LPI tx expiration time in msec");
 141 #define STMMAC_LPI_TIMER(x) (jiffies + msecs_to_jiffies(x))
 142
 143 static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
 144
 145 #ifdef CONFIG_STMMAC_DEBUG_FS
 146 static int stmmac_init_fs(struct net_device *dev);
 147 static void stmmac_exit_fs(void);
 148 #endif
 149
 150 /**
 151  * stmmac_verify_args - verify the driver parameters.
 152  * Description: it verifies if some wrong parameter is passed to the driver.
 153  * Note that wrong parameters are replaced with the default values.
 154  */
 155 static void stmmac_verify_args(void)
 156 {
 157         if (unlikely(watchdog < 0))
 158                 watchdog = TX_TIMEO;
 159         if (unlikely(dma_rxsize < 0))
 160                 dma_rxsize = DMA_RX_SIZE;
 161         if (unlikely(dma_txsize < 0))
 162                 dma_txsize = DMA_TX_SIZE;
 163         if (unlikely((buf_sz < DMA_BUFFER_SIZE) || (buf_sz > BUF_SIZE_16KiB)))
 164                 buf_sz = DMA_BUFFER_SIZE;
 165         if (unlikely(flow_ctrl > 1))
 166                 flow_ctrl = FLOW_AUTO;
 167         else if (likely(flow_ctrl < 0))
 168                 flow_ctrl = FLOW_OFF;
 169         if (unlikely((pause < 0) || (pause > 0xffff)))
 170                 pause = PAUSE_TIME;
 171         if (eee_timer < 0)
 172                 eee_timer = STMMAC_DEFAULT_LPI_TIMER;
 173 }
 174
 175 static void stmmac_clk_csr_set(struct stmmac_priv *priv)
 176 {
 177         u32 clk_rate;
 178
 179         clk_rate = clk_get_rate(priv->stmmac_clk);
 180
 181         /* Platform provided default clk_csr would be assumed valid
 182          * for all other cases except for the below mentioned ones. */
 183         if (!(priv->clk_csr & MAC_CSR_H_FRQ_MASK)) {
 184                 if (clk_rate < CSR_F_35M)
 185                         priv->clk_csr = STMMAC_CSR_20_35M;
 186                 else if ((clk_rate >= CSR_F_35M) && (clk_rate < CSR_F_60M))
 187                         priv->clk_csr = STMMAC_CSR_35_60M;
 188                 else if ((clk_rate >= CSR_F_60M) && (clk_rate < CSR_F_100M))
 189                         priv->clk_csr = STMMAC_CSR_60_100M;
 190                 else if ((clk_rate >= CSR_F_100M) && (clk_rate < CSR_F_150M))
 191                         priv->clk_csr = STMMAC_CSR_100_150M;
 192                 else if ((clk_rate >= CSR_F_150M) && (clk_rate < CSR_F_250M))
 193                         priv->clk_csr = STMMAC_CSR_150_250M;
 194                 else if ((clk_rate >= CSR_F_250M) && (clk_rate < CSR_F_300M))
 195                         priv->clk_csr = STMMAC_CSR_250_300M;
 196         } /* For values higher than the IEEE 802.3 specified frequency
 197            * we can not estimate the proper divider as it is not known
 198            * the frequency of clk_csr_i. So we do not change the default
 199            * divider. */
 200 }
 201
 202 #if defined(STMMAC_XMIT_DEBUG) || defined(STMMAC_RX_DEBUG)
 203 static void print_pkt(unsigned char *buf, int len)
 204 {
 205         int j;
 206         pr_info("len = %d byte, buf addr: 0x%p", len, buf);
 207         for (j = 0; j < len; j++) {
 208                 if ((j % 16) == 0)
 209                         pr_info("\n %03x:", j);
 210                 pr_info(" %02x", buf[j]);
 211         }
 212         pr_info("\n");
 213 }
 214 #endif
 215
 216 /* minimum number of free TX descriptors required to wake up TX process */
 217 #define STMMAC_TX_THRESH(x)     (x->dma_tx_size/4)
 218
 219 static inline u32 stmmac_tx_avail(struct stmmac_priv *priv)
 220 {
 221         return priv->dirty_tx + priv->dma_tx_size - priv->cur_tx - 1;
 222 }
 223
 224 /* On some ST platforms, some HW system configuraton registers have to be
 225  * set according to the link speed negotiated.
 226  */
 227 static inline void stmmac_hw_fix_mac_speed(struct stmmac_priv *priv)
 228 {
 229         struct phy_device *phydev = priv->phydev;
 230
 231         if (likely(priv->plat->fix_mac_speed))
 232                 priv->plat->fix_mac_speed(priv->plat->bsp_priv,
 233                                           phydev->speed);
 234 }
 235
 236 static void stmmac_enable_eee_mode(struct stmmac_priv *priv)
 237 {
 238         /* Check and enter in LPI mode */
 239         if ((priv->dirty_tx == priv->cur_tx) &&
 240             (priv->tx_path_in_lpi_mode == false))
 241                 priv->hw->mac->set_eee_mode(priv->ioaddr);
 242 }
 243
 244 void stmmac_disable_eee_mode(struct stmmac_priv *priv)
 245 {
 246         /* Exit and disable EEE in case of we are are in LPI state. */
 247         priv->hw->mac->reset_eee_mode(priv->ioaddr);
 248         del_timer_sync(&priv->eee_ctrl_timer);
 249         priv->tx_path_in_lpi_mode = false;
 250 }
 251
 252 /**
 253  * stmmac_eee_ctrl_timer
 254  * @arg : data hook
 255  * Description:
 256  *  If there is no data transfer and if we are not in LPI state,
 257  *  then MAC Transmitter can be moved to LPI state.
 258  */
 259 static void stmmac_eee_ctrl_timer(unsigned long arg)
 260 {
 261         struct stmmac_priv *priv = (struct stmmac_priv *)arg;
 262
 263         stmmac_enable_eee_mode(priv);
 264         mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_TIMER(eee_timer));
 265 }
 266
 267 /**
 268  * stmmac_eee_init
 269  * @priv: private device pointer
 270  * Description:
 271  *  If the EEE support has been enabled while configuring the driver,
 272  *  if the GMAC actually supports the EEE (from the HW cap reg) and the
 273  *  phy can also manage EEE, so enable the LPI state and start the timer
 274  *  to verify if the tx path can enter in LPI state.
 275  */
 276 bool stmmac_eee_init(struct stmmac_priv *priv)
 277 {
 278         bool ret = false;
 279
 280         /* MAC core supports the EEE feature. */
 281         if (priv->dma_cap.eee) {
 282                 /* Check if the PHY supports EEE */
 283                 if (phy_init_eee(priv->phydev, 1))
 284                         goto out;
 285
 286                 priv->eee_active = 1;
 287                 init_timer(&priv->eee_ctrl_timer);
 288                 priv->eee_ctrl_timer.function = stmmac_eee_ctrl_timer;
 289                 priv->eee_ctrl_timer.data = (unsigned long)priv;
 290                 priv->eee_ctrl_timer.expires = STMMAC_LPI_TIMER(eee_timer);
 291                 add_timer(&priv->eee_ctrl_timer);
 292
 293                 priv->hw->mac->set_eee_timer(priv->ioaddr,
 294                                              STMMAC_DEFAULT_LIT_LS_TIMER,
 295                                              priv->tx_lpi_timer);
 296
 297                 pr_info("stmmac: Energy-Efficient Ethernet initialized\n");
 298
 299                 ret = true;
 300         }
 301 out:
 302         return ret;
 303 }
 304
 305 static void stmmac_eee_adjust(struct stmmac_priv *priv)
 306 {
 307         /* When the EEE has been already initialised we have to
 308          * modify the PLS bit in the LPI ctrl & status reg according
 309          * to the PHY link status. For this reason.
 310          */
 311         if (priv->eee_enabled)
 312                 priv->hw->mac->set_eee_pls(priv->ioaddr, priv->phydev->link);
 313 }
 314
 315 /**
 316  * stmmac_adjust_link
 317  * @dev: net device structure
 318  * Description: it adjusts the link parameters.
 319  */
 320 static void stmmac_adjust_link(struct net_device *dev)
 321 {
 322         struct stmmac_priv *priv = netdev_priv(dev);
 323         struct phy_device *phydev = priv->phydev;
 324         unsigned long flags;
 325         int new_state = 0;
 326         unsigned int fc = priv->flow_ctrl, pause_time = priv->pause;
 327
 328         if (phydev == NULL)
 329                 return;
 330
 331         DBG(probe, DEBUG, "stmmac_adjust_link: called.  address %d link %d\n",
 332             phydev->addr, phydev->link);
 333
 334         spin_lock_irqsave(&priv->lock, flags);
 335
 336         if (phydev->link) {
 337                 u32 ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
 338
 339                 /* Now we make sure that we can be in full duplex mode.
 340                  * If not, we operate in half-duplex mode. */
 341                 if (phydev->duplex != priv->oldduplex) {
 342                         new_state = 1;
 343                         if (!(phydev->duplex))
 344                                 ctrl &= ~priv->hw->link.duplex;
 345                         else
 346                                 ctrl |= priv->hw->link.duplex;
 347                         priv->oldduplex = phydev->duplex;
 348                 }
 349                 /* Flow Control operation */
 350                 if (phydev->pause)
 351                         priv->hw->mac->flow_ctrl(priv->ioaddr, phydev->duplex,
 352                                                  fc, pause_time);
 353
 354                 if (phydev->speed != priv->speed) {
 355                         new_state = 1;
 356                         switch (phydev->speed) {
 357                         case 1000:
 358                                 if (likely(priv->plat->has_gmac))
 359                                         ctrl &= ~priv->hw->link.port;
 360                                         stmmac_hw_fix_mac_speed(priv);
 361                                 break;
 362                         case 100:
 363                         case 10:
 364                                 if (priv->plat->has_gmac) {
 365                                         ctrl |= priv->hw->link.port;
 366                                         if (phydev->speed == SPEED_100) {
 367                                                 ctrl |= priv->hw->link.speed;
 368                                         } else {
 369                                                 ctrl &= ~(priv->hw->link.speed);
 370                                         }
 371                                 } else {
 372                                         ctrl &= ~priv->hw->link.port;
 373                                 }
 374                                 stmmac_hw_fix_mac_speed(priv);
 375                                 break;
 376                         default:
 377                                 if (netif_msg_link(priv))
 378                                         pr_warning("%s: Speed (%d) is not 10"
 379                                        " or 100!\n", dev->name, phydev->speed);
 380                                 break;
 381                         }
 382
 383                         priv->speed = phydev->speed;
 384                 }
 385
 386                 writel(ctrl, priv->ioaddr + MAC_CTRL_REG);
 387
 388                 if (!priv->oldlink) {
 389                         new_state = 1;
 390                         priv->oldlink = 1;
 391                 }
 392         } else if (priv->oldlink) {
 393                 new_state = 1;
 394                 priv->oldlink = 0;
 395                 priv->speed = 0;
 396                 priv->oldduplex = -1;
 397         }
 398
 399         if (new_state && netif_msg_link(priv))
 400                 phy_print_status(phydev);
 401
 402         stmmac_eee_adjust(priv);
 403
 404         spin_unlock_irqrestore(&priv->lock, flags);
 405
 406         DBG(probe, DEBUG, "stmmac_adjust_link: exiting\n");
 407 }
 408
 409 /**
 410  * stmmac_init_phy - PHY initialization
 411  * @dev: net device structure
 412  * Description: it initializes the driver's PHY state, and attaches the PHY
 413  * to the mac driver.
 414  *  Return value:
 415  *  0 on success
 416  */
 417 static int stmmac_init_phy(struct net_device *dev)
 418 {
 419         struct stmmac_priv *priv = netdev_priv(dev);
 420         struct phy_device *phydev;
 421         char phy_id_fmt[MII_BUS_ID_SIZE + 3];
 422         char bus_id[MII_BUS_ID_SIZE];
 423         int interface = priv->plat->interface;
 424         priv->oldlink = 0;
 425         priv->speed = 0;
 426         priv->oldduplex = -1;
 427
 428         if (priv->plat->phy_bus_name)
 429                 snprintf(bus_id, MII_BUS_ID_SIZE, "%s-%x",
 430                                 priv->plat->phy_bus_name, priv->plat->bus_id);
 431         else
 432                 snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
 433                                 priv->plat->bus_id);
 434
 435         snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
 436                  priv->plat->phy_addr);
 437         pr_debug("stmmac_init_phy:  trying to attach to %s\n", phy_id_fmt);
 438
 439         phydev = phy_connect(dev, phy_id_fmt, &stmmac_adjust_link, 0,
 440                              interface);
 441
 442         if (IS_ERR(phydev)) {
 443                 pr_err("%s: Could not attach to PHY\n", dev->name);
 444                 return PTR_ERR(phydev);
 445         }
 446
 447         /* Stop Advertising 1000BASE Capability if interface is not GMII */
 448         if ((interface == PHY_INTERFACE_MODE_MII) ||
 449             (interface == PHY_INTERFACE_MODE_RMII))
 450                 phydev->advertising &= ~(SUPPORTED_1000baseT_Half |
 451                                          SUPPORTED_1000baseT_Full);
 452
 453         /*
 454          * Broken HW is sometimes missing the pull-up resistor on the
 455          * MDIO line, which results in reads to non-existent devices returning
 456          * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
 457          * device as well.
 458          * Note: phydev->phy_id is the result of reading the UID PHY registers.
 459          */
 460         if (phydev->phy_id == 0) {
 461                 phy_disconnect(phydev);
 462                 return -ENODEV;
 463         }
 464         pr_debug("stmmac_init_phy:  %s: attached to PHY (UID 0x%x)"
 465                  " Link = %d\n", dev->name, phydev->phy_id, phydev->link);
 466
 467         priv->phydev = phydev;
 468
 469         return 0;
 470 }
 471
 472 /**
 473  * display_ring
 474  * @p: pointer to the ring.
 475  * @size: size of the ring.
 476  * Description: display all the descriptors within the ring.
 477  */
 478 static void display_ring(struct dma_desc *p, int size)
 479 {
 480         struct tmp_s {
 481                 u64 a;
 482                 unsigned int b;
 483                 unsigned int c;
 484         };
 485         int i;
 486         for (i = 0; i < size; i++) {
 487                 struct tmp_s *x = (struct tmp_s *)(p + i);
 488                 pr_info("\t%d [0x%x]: DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
 489                        i, (unsigned int)virt_to_phys(&p[i]),
 490                        (unsigned int)(x->a), (unsigned int)((x->a) >> 32),
 491                        x->b, x->c);
 492                 pr_info("\n");
 493         }
 494 }
 495
 496 static int stmmac_set_bfsize(int mtu, int bufsize)
 497 {
 498         int ret = bufsize;
 499
 500         if (mtu >= BUF_SIZE_4KiB)
 501                 ret = BUF_SIZE_8KiB;
 502         else if (mtu >= BUF_SIZE_2KiB)
 503                 ret = BUF_SIZE_4KiB;
 504         else if (mtu >= DMA_BUFFER_SIZE)
 505                 ret = BUF_SIZE_2KiB;
 506         else
 507                 ret = DMA_BUFFER_SIZE;
 508
 509         return ret;
 510 }
 511
 512 /**
 513  * init_dma_desc_rings - init the RX/TX descriptor rings
 514  * @dev: net device structure
 515  * Description:  this function initializes the DMA RX/TX descriptors
 516  * and allocates the socket buffers. It suppors the chained and ring
 517  * modes.
 518  */
 519 static void init_dma_desc_rings(struct net_device *dev)
 520 {
 521         int i;
 522         struct stmmac_priv *priv = netdev_priv(dev);
 523         struct sk_buff *skb;
 524         unsigned int txsize = priv->dma_tx_size;
 525         unsigned int rxsize = priv->dma_rx_size;
 526         unsigned int bfsize;
 527         int dis_ic = 0;
 528         int des3_as_data_buf = 0;
 529
 530         /* Set the max buffer size according to the DESC mode
 531          * and the MTU. Note that RING mode allows 16KiB bsize. */
 532         bfsize = priv->hw->ring->set_16kib_bfsize(dev->mtu);
 533
 534         if (bfsize == BUF_SIZE_16KiB)
 535                 des3_as_data_buf = 1;
 536         else
 537                 bfsize = stmmac_set_bfsize(dev->mtu, priv->dma_buf_sz);
 538
 539 #ifdef CONFIG_STMMAC_TIMER
 540         /* Disable interrupts on completion for the reception if timer is on */
 541         if (likely(priv->tm->enable))
 542                 dis_ic = 1;
 543 #endif
 544
 545         DBG(probe, INFO, "stmmac: txsize %d, rxsize %d, bfsize %d\n",
 546             txsize, rxsize, bfsize);
 547
 548         priv->rx_skbuff_dma = kmalloc(rxsize * sizeof(dma_addr_t), GFP_KERNEL);
 549         priv->rx_skbuff =
 550             kmalloc(sizeof(struct sk_buff *) * rxsize, GFP_KERNEL);
 551         priv->dma_rx =
 552             (struct dma_desc *)dma_alloc_coherent(priv->device,
 553                                                   rxsize *
 554                                                   sizeof(struct dma_desc),
 555                                                   &priv->dma_rx_phy,
 556                                                   GFP_KERNEL);
 557         priv->tx_skbuff = kmalloc(sizeof(struct sk_buff *) * txsize,
 558                                        GFP_KERNEL);
 559         priv->dma_tx =
 560             (struct dma_desc *)dma_alloc_coherent(priv->device,
 561                                                   txsize *
 562                                                   sizeof(struct dma_desc),
 563                                                   &priv->dma_tx_phy,
 564                                                   GFP_KERNEL);
 565
 566         if ((priv->dma_rx == NULL) || (priv->dma_tx == NULL)) {
 567                 pr_err("%s:ERROR allocating the DMA Tx/Rx desc\n", __func__);
 568                 return;
 569         }
 570
 571         DBG(probe, INFO, "stmmac (%s) DMA desc: virt addr (Rx %p, "
 572             "Tx %p)\n\tDMA phy addr (Rx 0x%08x, Tx 0x%08x)\n",
 573             dev->name, priv->dma_rx, priv->dma_tx,
 574             (unsigned int)priv->dma_rx_phy, (unsigned int)priv->dma_tx_phy);
 575
 576         /* RX INITIALIZATION */
 577         DBG(probe, INFO, "stmmac: SKB addresses:\n"
 578                          "skb\t\tskb data\tdma data\n");
 579
 580         for (i = 0; i < rxsize; i++) {
 581                 struct dma_desc *p = priv->dma_rx + i;
 582
 583                 skb = __netdev_alloc_skb(dev, bfsize + NET_IP_ALIGN,
 584                                          GFP_KERNEL);
 585                 if (unlikely(skb == NULL)) {
 586                         pr_err("%s: Rx init fails; skb is NULL\n", __func__);
 587                         break;
 588                 }
 589                 skb_reserve(skb, NET_IP_ALIGN);
 590                 priv->rx_skbuff[i] = skb;
 591                 priv->rx_skbuff_dma[i] = dma_map_single(priv->device, skb->data,
 592                                                 bfsize, DMA_FROM_DEVICE);
 593
 594                 p->des2 = priv->rx_skbuff_dma[i];
 595
 596                 priv->hw->ring->init_desc3(des3_as_data_buf, p);
 597
 598                 DBG(probe, INFO, "[%p]\t[%p]\t[%x]\n", priv->rx_skbuff[i],
 599                         priv->rx_skbuff[i]->data, priv->rx_skbuff_dma[i]);
 600         }
 601         priv->cur_rx = 0;
 602         priv->dirty_rx = (unsigned int)(i - rxsize);
 603         priv->dma_buf_sz = bfsize;
 604         buf_sz = bfsize;
 605
 606         /* TX INITIALIZATION */
 607         for (i = 0; i < txsize; i++) {
 608                 priv->tx_skbuff[i] = NULL;
 609                 priv->dma_tx[i].des2 = 0;
 610         }
 611
 612         /* In case of Chained mode this sets the des3 to the next
 613          * element in the chain */
 614         priv->hw->ring->init_dma_chain(priv->dma_rx, priv->dma_rx_phy, rxsize);
 615         priv->hw->ring->init_dma_chain(priv->dma_tx, priv->dma_tx_phy, txsize);
 616
 617         priv->dirty_tx = 0;
 618         priv->cur_tx = 0;
 619
 620         /* Clear the Rx/Tx descriptors */
 621         priv->hw->desc->init_rx_desc(priv->dma_rx, rxsize, dis_ic);
 622         priv->hw->desc->init_tx_desc(priv->dma_tx, txsize);
 623
 624         if (netif_msg_hw(priv)) {
 625                 pr_info("RX descriptor ring:\n");
 626                 display_ring(priv->dma_rx, rxsize);
 627                 pr_info("TX descriptor ring:\n");
 628                 display_ring(priv->dma_tx, txsize);
 629         }
 630 }
 631
 632 static void dma_free_rx_skbufs(struct stmmac_priv *priv)
 633 {
 634         int i;
 635
 636         for (i = 0; i < priv->dma_rx_size; i++) {
 637                 if (priv->rx_skbuff[i]) {
 638                         dma_unmap_single(priv->device, priv->rx_skbuff_dma[i],
 639                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
 640                         dev_kfree_skb_any(priv->rx_skbuff[i]);
 641                 }
 642                 priv->rx_skbuff[i] = NULL;
 643         }
 644 }
 645
 646 static void dma_free_tx_skbufs(struct stmmac_priv *priv)
 647 {
 648         int i;
 649
 650         for (i = 0; i < priv->dma_tx_size; i++) {
 651                 if (priv->tx_skbuff[i] != NULL) {
 652                         struct dma_desc *p = priv->dma_tx + i;
 653                         if (p->des2)
 654                                 dma_unmap_single(priv->device, p->des2,
 655                                                  priv->hw->desc->get_tx_len(p),
 656                                                  DMA_TO_DEVICE);
 657                         dev_kfree_skb_any(priv->tx_skbuff[i]);
 658                         priv->tx_skbuff[i] = NULL;
 659                 }
 660         }
 661 }
 662
 663 static void free_dma_desc_resources(struct stmmac_priv *priv)
 664 {
 665         /* Release the DMA TX/RX socket buffers */
 666         dma_free_rx_skbufs(priv);
 667         dma_free_tx_skbufs(priv);
 668
 669         /* Free the region of consistent memory previously allocated for
 670          * the DMA */
 671         dma_free_coherent(priv->device,
 672                           priv->dma_tx_size * sizeof(struct dma_desc),
 673                           priv->dma_tx, priv->dma_tx_phy);
 674         dma_free_coherent(priv->device,
 675                           priv->dma_rx_size * sizeof(struct dma_desc),
 676                           priv->dma_rx, priv->dma_rx_phy);
 677         kfree(priv->rx_skbuff_dma);
 678         kfree(priv->rx_skbuff);
 679         kfree(priv->tx_skbuff);
 680 }
 681
 682 /**
 683  *  stmmac_dma_operation_mode - HW DMA operation mode
 684  *  @priv : pointer to the private device structure.
 685  *  Description: it sets the DMA operation mode: tx/rx DMA thresholds
 686  *  or Store-And-Forward capability.
 687  */
 688 static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 689 {
 690         if (likely(priv->plat->force_sf_dma_mode ||
 691                 ((priv->plat->tx_coe) && (!priv->no_csum_insertion)))) {
 692                 /*
 693                  * In case of GMAC, SF mode can be enabled
 694                  * to perform the TX COE in HW. This depends on:
 695                  * 1) TX COE if actually supported
 696                  * 2) There is no bugged Jumbo frame support
 697                  *    that needs to not insert csum in the TDES.
 698                  */
 699                 priv->hw->dma->dma_mode(priv->ioaddr,
 700                                         SF_DMA_MODE, SF_DMA_MODE);
 701                 tc = SF_DMA_MODE;
 702         } else
 703                 priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 704 }
 705
 706 /**
 707  * stmmac_tx:
 708  * @priv: private driver structure
 709  * Description: it reclaims resources after transmission completes.
 710  */
 711 static void stmmac_tx(struct stmmac_priv *priv)
 712 {
 713         unsigned int txsize = priv->dma_tx_size;
 714
 715         spin_lock(&priv->tx_lock);
 716
 717         while (priv->dirty_tx != priv->cur_tx) {
 718                 int last;
 719                 unsigned int entry = priv->dirty_tx % txsize;
 720                 struct sk_buff *skb = priv->tx_skbuff[entry];
 721                 struct dma_desc *p = priv->dma_tx + entry;
 722
 723                 /* Check if the descriptor is owned by the DMA. */
 724                 if (priv->hw->desc->get_tx_owner(p))
 725                         break;
 726
 727                 /* Verify tx error by looking at the last segment */
 728                 last = priv->hw->desc->get_tx_ls(p);
 729                 if (likely(last)) {
 730                         int tx_error =
 731                                 priv->hw->desc->tx_status(&priv->dev->stats,
 732                                                           &priv->xstats, p,
 733                                                           priv->ioaddr);
 734                         if (likely(tx_error == 0)) {
 735                                 priv->dev->stats.tx_packets++;
 736                                 priv->xstats.tx_pkt_n++;
 737                         } else
 738                                 priv->dev->stats.tx_errors++;
 739                 }
 740                 TX_DBG("%s: curr %d, dirty %d\n", __func__,
 741                         priv->cur_tx, priv->dirty_tx);
 742
 743                 if (likely(p->des2))
 744                         dma_unmap_single(priv->device, p->des2,
 745                                          priv->hw->desc->get_tx_len(p),
 746                                          DMA_TO_DEVICE);
 747                 priv->hw->ring->clean_desc3(p);
 748
 749                 if (likely(skb != NULL)) {
 750                         dev_kfree_skb(skb);
 751                         priv->tx_skbuff[entry] = NULL;
 752                 }
 753
 754                 priv->hw->desc->release_tx_desc(p);
 755
 756                 priv->dirty_tx++;
 757         }
 758         if (unlikely(netif_queue_stopped(priv->dev) &&
 759                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv))) {
 760                 netif_tx_lock(priv->dev);
 761                 if (netif_queue_stopped(priv->dev) &&
 762                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv)) {
 763                         TX_DBG("%s: restart transmit\n", __func__);
 764                         netif_wake_queue(priv->dev);
 765                 }
 766                 netif_tx_unlock(priv->dev);
 767         }
 768
 769         if ((priv->eee_enabled) && (!priv->tx_path_in_lpi_mode)) {
 770                 stmmac_enable_eee_mode(priv);
 771                 mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_TIMER(eee_timer));
 772         }
 773         spin_unlock(&priv->tx_lock);
 774 }
 775
 776 static inline void stmmac_enable_irq(struct stmmac_priv *priv)
 777 {
 778 #ifdef CONFIG_STMMAC_TIMER
 779         if (likely(priv->tm->enable))
 780                 priv->tm->timer_start(tmrate);
 781         else
 782 #endif
 783                 priv->hw->dma->enable_dma_irq(priv->ioaddr);
 784 }
 785
 786 static inline void stmmac_disable_irq(struct stmmac_priv *priv)
 787 {
 788 #ifdef CONFIG_STMMAC_TIMER
 789         if (likely(priv->tm->enable))
 790                 priv->tm->timer_stop();
 791         else
 792 #endif
 793                 priv->hw->dma->disable_dma_irq(priv->ioaddr);
 794 }
 795
 796 static int stmmac_has_work(struct stmmac_priv *priv)
 797 {
 798         unsigned int has_work = 0;
 799         int rxret, tx_work = 0;
 800
 801         rxret = priv->hw->desc->get_rx_owner(priv->dma_rx +
 802                 (priv->cur_rx % priv->dma_rx_size));
 803
 804         if (priv->dirty_tx != priv->cur_tx)
 805                 tx_work = 1;
 806
 807         if (likely(!rxret || tx_work))
 808                 has_work = 1;
 809
 810         return has_work;
 811 }
 812
 813 static inline void _stmmac_schedule(struct stmmac_priv *priv)
 814 {
 815         if (likely(stmmac_has_work(priv))) {
 816                 stmmac_disable_irq(priv);
 817                 napi_schedule(&priv->napi);
 818         }
 819 }
 820
 821 #ifdef CONFIG_STMMAC_TIMER
 822 void stmmac_schedule(struct net_device *dev)
 823 {
 824         struct stmmac_priv *priv = netdev_priv(dev);
 825
 826         priv->xstats.sched_timer_n++;
 827
 828         _stmmac_schedule(priv);
 829 }
 830
 831 static void stmmac_no_timer_started(unsigned int x)
 832 {;
 833 };
 834
 835 static void stmmac_no_timer_stopped(void)
 836 {;
 837 };
 838 #endif
 839
 840 /**
 841  * stmmac_tx_err:
 842  * @priv: pointer to the private device structure
 843  * Description: it cleans the descriptors and restarts the transmission
 844  * in case of errors.
 845  */
 846 static void stmmac_tx_err(struct stmmac_priv *priv)
 847 {
 848         netif_stop_queue(priv->dev);
 849
 850         priv->hw->dma->stop_tx(priv->ioaddr);
 851         dma_free_tx_skbufs(priv);
 852         priv->hw->desc->init_tx_desc(priv->dma_tx, priv->dma_tx_size);
 853         priv->dirty_tx = 0;
 854         priv->cur_tx = 0;
 855         priv->hw->dma->start_tx(priv->ioaddr);
 856
 857         priv->dev->stats.tx_errors++;
 858         netif_wake_queue(priv->dev);
 859 }
 860
 861
 862 static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 863 {
 864         int status;
 865
 866         status = priv->hw->dma->dma_interrupt(priv->ioaddr, &priv->xstats);
 867         if (likely(status == handle_tx_rx))
 868                 _stmmac_schedule(priv);
 869
 870         else if (unlikely(status == tx_hard_error_bump_tc)) {
 871                 /* Try to bump up the dma threshold on this failure */
 872                 if (unlikely(tc != SF_DMA_MODE) && (tc <= 256)) {
 873                         tc += 64;
 874                         priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 875                         priv->xstats.threshold = tc;
 876                 }
 877         } else if (unlikely(status == tx_hard_error))
 878                 stmmac_tx_err(priv);
 879 }
 880
 881 static void stmmac_mmc_setup(struct stmmac_priv *priv)
 882 {
 883         unsigned int mode = MMC_CNTRL_RESET_ON_READ | MMC_CNTRL_COUNTER_RESET |
 884                             MMC_CNTRL_PRESET | MMC_CNTRL_FULL_HALF_PRESET;
 885
 886         /* Mask MMC irq, counters are managed in SW and registers
 887          * are cleared on each READ eventually. */
 888         dwmac_mmc_intr_all_mask(priv->ioaddr);
 889
 890         if (priv->dma_cap.rmon) {
 891                 dwmac_mmc_ctrl(priv->ioaddr, mode);
 892                 memset(&priv->mmc, 0, sizeof(struct stmmac_counters));
 893         } else
 894                 pr_info(" No MAC Management Counters available\n");
 895 }
 896
 897 static u32 stmmac_get_synopsys_id(struct stmmac_priv *priv)
 898 {
 899         u32 hwid = priv->hw->synopsys_uid;
 900
 901         /* Only check valid Synopsys Id because old MAC chips
 902          * have no HW registers where get the ID */
 903         if (likely(hwid)) {
 904                 u32 uid = ((hwid & 0x0000ff00) >> 8);
 905                 u32 synid = (hwid & 0x000000ff);
 906
 907                 pr_info("stmmac - user ID: 0x%x, Synopsys ID: 0x%x\n",
 908                         uid, synid);
 909
 910                 return synid;
 911         }
 912         return 0;
 913 }
 914
 915 /**
 916  * stmmac_selec_desc_mode
 917  * @priv : private structure
 918  * Description: select the Enhanced/Alternate or Normal descriptors
 919  */
 920 static void stmmac_selec_desc_mode(struct stmmac_priv *priv)
 921 {
 922         if (priv->plat->enh_desc) {
 923                 pr_info(" Enhanced/Alternate descriptors\n");
 924                 priv->hw->desc = &enh_desc_ops;
 925         } else {
 926                 pr_info(" Normal descriptors\n");
 927                 priv->hw->desc = &ndesc_ops;
 928         }
 929 }
 930
 931 /**
 932  * stmmac_get_hw_features
 933  * @priv : private device pointer
 934  * Description:
 935  *  new GMAC chip generations have a new register to indicate the
 936  *  presence of the optional feature/functions.
 937  *  This can be also used to override the value passed through the
 938  *  platform and necessary for old MAC10/100 and GMAC chips.
 939  */
 940 static int stmmac_get_hw_features(struct stmmac_priv *priv)
 941 {
 942         u32 hw_cap = 0;
 943
 944         if (priv->hw->dma->get_hw_feature) {
 945                 hw_cap = priv->hw->dma->get_hw_feature(priv->ioaddr);
 946
 947                 priv->dma_cap.mbps_10_100 = (hw_cap & DMA_HW_FEAT_MIISEL);
 948                 priv->dma_cap.mbps_1000 = (hw_cap & DMA_HW_FEAT_GMIISEL) >> 1;
 949                 priv->dma_cap.half_duplex = (hw_cap & DMA_HW_FEAT_HDSEL) >> 2;
 950                 priv->dma_cap.hash_filter = (hw_cap & DMA_HW_FEAT_HASHSEL) >> 4;
 951                 priv->dma_cap.multi_addr =
 952                         (hw_cap & DMA_HW_FEAT_ADDMACADRSEL) >> 5;
 953                 priv->dma_cap.pcs = (hw_cap & DMA_HW_FEAT_PCSSEL) >> 6;
 954                 priv->dma_cap.sma_mdio = (hw_cap & DMA_HW_FEAT_SMASEL) >> 8;
 955                 priv->dma_cap.pmt_remote_wake_up =
 956                         (hw_cap & DMA_HW_FEAT_RWKSEL) >> 9;
 957                 priv->dma_cap.pmt_magic_frame =
 958                         (hw_cap & DMA_HW_FEAT_MGKSEL) >> 10;
 959                 /* MMC */
 960                 priv->dma_cap.rmon = (hw_cap & DMA_HW_FEAT_MMCSEL) >> 11;
 961                 /* IEEE 1588-2002*/
 962                 priv->dma_cap.time_stamp =
 963                         (hw_cap & DMA_HW_FEAT_TSVER1SEL) >> 12;
 964                 /* IEEE 1588-2008*/
 965                 priv->dma_cap.atime_stamp =
 966                         (hw_cap & DMA_HW_FEAT_TSVER2SEL) >> 13;
 967                 /* 802.3az - Energy-Efficient Ethernet (EEE) */
 968                 priv->dma_cap.eee = (hw_cap & DMA_HW_FEAT_EEESEL) >> 14;
 969                 priv->dma_cap.av = (hw_cap & DMA_HW_FEAT_AVSEL) >> 15;
 970                 /* TX and RX csum */
 971                 priv->dma_cap.tx_coe = (hw_cap & DMA_HW_FEAT_TXCOESEL) >> 16;
 972                 priv->dma_cap.rx_coe_type1 =
 973                         (hw_cap & DMA_HW_FEAT_RXTYP1COE) >> 17;
 974                 priv->dma_cap.rx_coe_type2 =
 975                         (hw_cap & DMA_HW_FEAT_RXTYP2COE) >> 18;
 976                 priv->dma_cap.rxfifo_over_2048 =
 977                         (hw_cap & DMA_HW_FEAT_RXFIFOSIZE) >> 19;
 978                 /* TX and RX number of channels */
 979                 priv->dma_cap.number_rx_channel =
 980                         (hw_cap & DMA_HW_FEAT_RXCHCNT) >> 20;
 981                 priv->dma_cap.number_tx_channel =
 982                         (hw_cap & DMA_HW_FEAT_TXCHCNT) >> 22;
 983                 /* Alternate (enhanced) DESC mode*/
 984                 priv->dma_cap.enh_desc =
 985                         (hw_cap & DMA_HW_FEAT_ENHDESSEL) >> 24;
 986
 987         }
 988
 989         return hw_cap;
 990 }
 991
 992 static void stmmac_check_ether_addr(struct stmmac_priv *priv)
 993 {
 994         /* verify if the MAC address is valid, in case of failures it
 995          * generates a random MAC address */
 996         if (!is_valid_ether_addr(priv->dev->dev_addr)) {
 997                 priv->hw->mac->get_umac_addr((void __iomem *)
 998                                              priv->dev->base_addr,
 999                                              priv->dev->dev_addr, 0);
1000                 if  (!is_valid_ether_addr(priv->dev->dev_addr))
1001                         eth_hw_addr_random(priv->dev);
1002         }
1003         pr_warning("%s: device MAC address %pM\n", priv->dev->name,
1004                                                    priv->dev->dev_addr);
1005 }
1006
1007 static int stmmac_init_dma_engine(struct stmmac_priv *priv)
1008 {
1009         int pbl = DEFAULT_DMA_PBL, fixed_burst = 0, burst_len = 0;
1010         int mixed_burst = 0;
1011
1012         /* Some DMA parameters can be passed from the platform;
1013          * in case of these are not passed we keep a default
1014          * (good for all the chips) and init the DMA! */
1015         if (priv->plat->dma_cfg) {
1016                 pbl = priv->plat->dma_cfg->pbl;
1017                 fixed_burst = priv->plat->dma_cfg->fixed_burst;
1018                 mixed_burst = priv->plat->dma_cfg->mixed_burst;
1019                 burst_len = priv->plat->dma_cfg->burst_len;
1020         }
1021
1022         return priv->hw->dma->init(priv->ioaddr, pbl, fixed_burst, mixed_burst,
1023                                    burst_len, priv->dma_tx_phy,
1024                                    priv->dma_rx_phy);
1025 }
1026
1027 /**
1028  *  stmmac_open - open entry point of the driver
1029  *  @dev : pointer to the device structure.
1030  *  Description:
1031  *  This function is the open entry point of the driver.
1032  *  Return value:
1033  *  0 on success and an appropriate (-)ve integer as defined in errno.h
1034  *  file on failure.
1035  */
1036 static int stmmac_open(struct net_device *dev)
1037 {
1038         struct stmmac_priv *priv = netdev_priv(dev);
1039         int ret;
1040
1041 #ifdef CONFIG_STMMAC_TIMER
1042         priv->tm = kzalloc(sizeof(struct stmmac_timer *), GFP_KERNEL);
1043         if (unlikely(priv->tm == NULL))
1044                 return -ENOMEM;
1045
1046         priv->tm->freq = tmrate;
1047
1048         /* Test if the external timer can be actually used.
1049          * In case of failure continue without timer. */
1050         if (unlikely((stmmac_open_ext_timer(dev, priv->tm)) < 0)) {
1051                 pr_warning("stmmaceth: cannot attach the external timer.\n");
1052                 priv->tm->freq = 0;
1053                 priv->tm->timer_start = stmmac_no_timer_started;
1054                 priv->tm->timer_stop = stmmac_no_timer_stopped;
1055         } else
1056                 priv->tm->enable = 1;
1057 #endif
1058         clk_prepare_enable(priv->stmmac_clk);
1059
1060         stmmac_check_ether_addr(priv);
1061
1062         ret = stmmac_init_phy(dev);
1063         if (unlikely(ret)) {
1064                 pr_err("%s: Cannot attach to PHY (error: %d)\n", __func__, ret);
1065                 goto open_error;
1066         }
1067
1068         /* Create and initialize the TX/RX descriptors chains. */
1069         priv->dma_tx_size = STMMAC_ALIGN(dma_txsize);
1070         priv->dma_rx_size = STMMAC_ALIGN(dma_rxsize);
1071         priv->dma_buf_sz = STMMAC_ALIGN(buf_sz);
1072         init_dma_desc_rings(dev);
1073
1074         /* DMA initialization and SW reset */
1075         ret = stmmac_init_dma_engine(priv);
1076         if (ret < 0) {
1077                 pr_err("%s: DMA initialization failed\n", __func__);
1078                 goto open_error;
1079         }
1080
1081         /* Copy the MAC addr into the HW  */
1082         priv->hw->mac->set_umac_addr(priv->ioaddr, dev->dev_addr, 0);
1083
1084         /* If required, perform hw setup of the bus. */
1085         if (priv->plat->bus_setup)
1086                 priv->plat->bus_setup(priv->ioaddr);
1087
1088         /* Initialize the MAC Core */
1089         priv->hw->mac->core_init(priv->ioaddr);
1090
1091         /* Request the IRQ lines */
1092         ret = request_irq(dev->irq, stmmac_interrupt,
1093                          IRQF_SHARED, dev->name, dev);
1094         if (unlikely(ret < 0)) {
1095                 pr_err("%s: ERROR: allocating the IRQ %d (error: %d)\n",
1096                        __func__, dev->irq, ret);
1097                 goto open_error;
1098         }
1099
1100         /* Request the Wake IRQ in case of another line is used for WoL */
1101         if (priv->wol_irq != dev->irq) {
1102                 ret = request_irq(priv->wol_irq, stmmac_interrupt,
1103                                   IRQF_SHARED, dev->name, dev);
1104                 if (unlikely(ret < 0)) {
1105                         pr_err("%s: ERROR: allocating the ext WoL IRQ %d "
1106                                "(error: %d)\n", __func__, priv->wol_irq, ret);
1107                         goto open_error_wolirq;
1108                 }
1109         }
1110
1111         /* Request the IRQ lines */
1112         if (priv->lpi_irq != -ENXIO) {
1113                 ret = request_irq(priv->lpi_irq, stmmac_interrupt, IRQF_SHARED,
1114                                   dev->name, dev);
1115                 if (unlikely(ret < 0)) {
1116                         pr_err("%s: ERROR: allocating the LPI IRQ %d (%d)\n",
1117                                __func__, priv->lpi_irq, ret);
1118                         goto open_error_lpiirq;
1119                 }
1120         }
1121
1122         /* Enable the MAC Rx/Tx */
1123         stmmac_set_mac(priv->ioaddr, true);
1124
1125         /* Set the HW DMA mode and the COE */
1126         stmmac_dma_operation_mode(priv);
1127
1128         /* Extra statistics */
1129         memset(&priv->xstats, 0, sizeof(struct stmmac_extra_stats));
1130         priv->xstats.threshold = tc;
1131
1132         stmmac_mmc_setup(priv);
1133
1134 #ifdef CONFIG_STMMAC_DEBUG_FS
1135         ret = stmmac_init_fs(dev);
1136         if (ret < 0)
1137                 pr_warning("%s: failed debugFS registration\n", __func__);
1138 #endif
1139         /* Start the ball rolling... */
1140         DBG(probe, DEBUG, "%s: DMA RX/TX processes started...\n", dev->name);
1141         priv->hw->dma->start_tx(priv->ioaddr);
1142         priv->hw->dma->start_rx(priv->ioaddr);
1143
1144 #ifdef CONFIG_STMMAC_TIMER
1145         priv->tm->timer_start(tmrate);
1146 #endif
1147
1148         /* Dump DMA/MAC registers */
1149         if (netif_msg_hw(priv)) {
1150                 priv->hw->mac->dump_regs(priv->ioaddr);
1151                 priv->hw->dma->dump_regs(priv->ioaddr);
1152         }
1153
1154         if (priv->phydev)
1155                 phy_start(priv->phydev);
1156
1157         priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS_TIMER;
1158         priv->eee_enabled = stmmac_eee_init(priv);
1159
1160         napi_enable(&priv->napi);
1161         netif_start_queue(dev);
1162
1163         return 0;
1164
1165 open_error_lpiirq:
1166         if (priv->wol_irq != dev->irq)
1167                 free_irq(priv->wol_irq, dev);
1168
1169 open_error_wolirq:
1170         free_irq(dev->irq, dev);
1171
1172 open_error:
1173 #ifdef CONFIG_STMMAC_TIMER
1174         kfree(priv->tm);
1175 #endif
1176         if (priv->phydev)
1177                 phy_disconnect(priv->phydev);
1178
1179         clk_disable_unprepare(priv->stmmac_clk);
1180
1181         return ret;
1182 }
1183
1184 /**
1185  *  stmmac_release - close entry point of the driver
1186  *  @dev : device pointer.
1187  *  Description:
1188  *  This is the stop entry point of the driver.
1189  */
1190 static int stmmac_release(struct net_device *dev)
1191 {
1192         struct stmmac_priv *priv = netdev_priv(dev);
1193
1194         if (priv->eee_enabled)
1195                 del_timer_sync(&priv->eee_ctrl_timer);
1196
1197         /* Stop and disconnect the PHY */
1198         if (priv->phydev) {
1199                 phy_stop(priv->phydev);
1200                 phy_disconnect(priv->phydev);
1201                 priv->phydev = NULL;
1202         }
1203
1204         netif_stop_queue(dev);
1205
1206 #ifdef CONFIG_STMMAC_TIMER
1207         /* Stop and release the timer */
1208         stmmac_close_ext_timer();
1209         if (priv->tm != NULL)
1210                 kfree(priv->tm);
1211 #endif
1212         napi_disable(&priv->napi);
1213
1214         /* Free the IRQ lines */
1215         free_irq(dev->irq, dev);
1216         if (priv->wol_irq != dev->irq)
1217                 free_irq(priv->wol_irq, dev);
1218         if (priv->lpi_irq != -ENXIO)
1219                 free_irq(priv->lpi_irq, dev);
1220
1221         /* Stop TX/RX DMA and clear the descriptors */
1222         priv->hw->dma->stop_tx(priv->ioaddr);
1223         priv->hw->dma->stop_rx(priv->ioaddr);
1224
1225         /* Release and free the Rx/Tx resources */
1226         free_dma_desc_resources(priv);
1227
1228         /* Disable the MAC Rx/Tx */
1229         stmmac_set_mac(priv->ioaddr, false);
1230
1231         netif_carrier_off(dev);
1232
1233 #ifdef CONFIG_STMMAC_DEBUG_FS
1234         stmmac_exit_fs();
1235 #endif
1236         clk_disable_unprepare(priv->stmmac_clk);
1237
1238         return 0;
1239 }
1240
1241 /**
1242  *  stmmac_xmit:
1243  *  @skb : the socket buffer
1244  *  @dev : device pointer
1245  *  Description : Tx entry point of the driver.
1246  */
1247 static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
1248 {
1249         struct stmmac_priv *priv = netdev_priv(dev);
1250         unsigned int txsize = priv->dma_tx_size;
1251         unsigned int entry;
1252         int i, csum_insertion = 0;
1253         int nfrags = skb_shinfo(skb)->nr_frags;
1254         struct dma_desc *desc, *first;
1255         unsigned int nopaged_len = skb_headlen(skb);
1256
1257         if (unlikely(stmmac_tx_avail(priv) < nfrags + 1)) {
1258                 if (!netif_queue_stopped(dev)) {
1259                         netif_stop_queue(dev);
1260                         /* This is a hard error, log it. */
1261                         pr_err("%s: BUG! Tx Ring full when queue awake\n",
1262                                 __func__);
1263                 }
1264                 return NETDEV_TX_BUSY;
1265         }
1266
1267         spin_lock(&priv->tx_lock);
1268
1269         if (priv->tx_path_in_lpi_mode)
1270                 stmmac_disable_eee_mode(priv);
1271
1272         entry = priv->cur_tx % txsize;
1273
1274 #ifdef STMMAC_XMIT_DEBUG
1275         if ((skb->len > ETH_FRAME_LEN) || nfrags)
1276                 pr_info("stmmac xmit:\n"
1277                        "\tskb addr %p - len: %d - nopaged_len: %d\n"
1278                        "\tn_frags: %d - ip_summed: %d - %s gso\n",
1279                        skb, skb->len, nopaged_len, nfrags, skb->ip_summed,
1280                        !skb_is_gso(skb) ? "isn't" : "is");
1281 #endif
1282
1283         csum_insertion = (skb->ip_summed == CHECKSUM_PARTIAL);
1284
1285         desc = priv->dma_tx + entry;
1286         first = desc;
1287
1288 #ifdef STMMAC_XMIT_DEBUG
1289         if ((nfrags > 0) || (skb->len > ETH_FRAME_LEN))
1290                 pr_debug("stmmac xmit: skb len: %d, nopaged_len: %d,\n"
1291                        "\t\tn_frags: %d, ip_summed: %d\n",
1292                        skb->len, nopaged_len, nfrags, skb->ip_summed);
1293 #endif
1294         priv->tx_skbuff[entry] = skb;
1295
1296         if (priv->hw->ring->is_jumbo_frm(skb->len, priv->plat->enh_desc)) {
1297                 entry = priv->hw->ring->jumbo_frm(priv, skb, csum_insertion);
1298                 desc = priv->dma_tx + entry;
1299         } else {
1300                 desc->des2 = dma_map_single(priv->device, skb->data,
1301                                         nopaged_len, DMA_TO_DEVICE);
1302                 priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
1303                                                 csum_insertion);
1304         }
1305
1306         for (i = 0; i < nfrags; i++) {
1307                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1308                 int len = skb_frag_size(frag);
1309
1310                 entry = (++priv->cur_tx) % txsize;
1311                 desc = priv->dma_tx + entry;
1312
1313                 TX_DBG("\t[entry %d] segment len: %d\n", entry, len);
1314                 desc->des2 = skb_frag_dma_map(priv->device, frag, 0, len,
1315                                               DMA_TO_DEVICE);
1316                 priv->tx_skbuff[entry] = NULL;
1317                 priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion);
1318                 wmb();
1319                 priv->hw->desc->set_tx_owner(desc);
1320                 wmb();
1321         }
1322
1323         /* Interrupt on completition only for the latest segment */
1324         priv->hw->desc->close_tx_desc(desc);
1325
1326 #ifdef CONFIG_STMMAC_TIMER
1327         /* Clean IC while using timer */
1328         if (likely(priv->tm->enable))
1329                 priv->hw->desc->clear_tx_ic(desc);
1330 #endif
1331
1332         wmb();
1333
1334         /* To avoid raise condition */
1335         priv->hw->desc->set_tx_owner(first);
1336         wmb();
1337
1338         priv->cur_tx++;
1339
1340 #ifdef STMMAC_XMIT_DEBUG
1341         if (netif_msg_pktdata(priv)) {
1342                 pr_info("stmmac xmit: current=%d, dirty=%d, entry=%d, "
1343                        "first=%p, nfrags=%d\n",
1344                        (priv->cur_tx % txsize), (priv->dirty_tx % txsize),
1345                        entry, first, nfrags);
1346                 display_ring(priv->dma_tx, txsize);
1347                 pr_info(">>> frame to be transmitted: ");
1348                 print_pkt(skb->data, skb->len);
1349         }
1350 #endif
1351         if (unlikely(stmmac_tx_avail(priv) <= (MAX_SKB_FRAGS + 1))) {
1352                 TX_DBG("%s: stop transmitted packets\n", __func__);
1353                 netif_stop_queue(dev);
1354         }
1355
1356         dev->stats.tx_bytes += skb->len;
1357
1358         skb_tx_timestamp(skb);
1359
1360         priv->hw->dma->enable_dma_transmission(priv->ioaddr);
1361
1362         spin_unlock(&priv->tx_lock);
1363
1364         return NETDEV_TX_OK;
1365 }
1366
1367 static inline void stmmac_rx_refill(struct stmmac_priv *priv)
1368 {
1369         unsigned int rxsize = priv->dma_rx_size;
1370         int bfsize = priv->dma_buf_sz;
1371         struct dma_desc *p = priv->dma_rx;
1372
1373         for (; priv->cur_rx - priv->dirty_rx > 0; priv->dirty_rx++) {
1374                 unsigned int entry = priv->dirty_rx % rxsize;
1375                 if (likely(priv->rx_skbuff[entry] == NULL)) {
1376                         struct sk_buff *skb;
1377
1378                         skb = netdev_alloc_skb_ip_align(priv->dev, bfsize);
1379
1380                         if (unlikely(skb == NULL))
1381                                 break;
1382
1383                         priv->rx_skbuff[entry] = skb;
1384                         priv->rx_skbuff_dma[entry] =
1385                             dma_map_single(priv->device, skb->data, bfsize,
1386                                            DMA_FROM_DEVICE);
1387
1388                         (p + entry)->des2 = priv->rx_skbuff_dma[entry];
1389
1390                         if (unlikely(priv->plat->has_gmac))
1391                                 priv->hw->ring->refill_desc3(bfsize, p + entry);
1392
1393                         RX_DBG(KERN_INFO "\trefill entry #%d\n", entry);
1394                 }
1395                 wmb();
1396                 priv->hw->desc->set_rx_owner(p + entry);
1397                 wmb();
1398         }
1399 }
1400
1401 static int stmmac_rx(struct stmmac_priv *priv, int limit)
1402 {
1403         unsigned int rxsize = priv->dma_rx_size;
1404         unsigned int entry = priv->cur_rx % rxsize;
1405         unsigned int next_entry;
1406         unsigned int count = 0;
1407         struct dma_desc *p = priv->dma_rx + entry;
1408         struct dma_desc *p_next;
1409
1410 #ifdef STMMAC_RX_DEBUG
1411         if (netif_msg_hw(priv)) {
1412                 pr_debug(">>> stmmac_rx: descriptor ring:\n");
1413                 display_ring(priv->dma_rx, rxsize);
1414         }
1415 #endif
1416         while (!priv->hw->desc->get_rx_owner(p)) {
1417                 int status;
1418
1419                 if (count >= limit)
1420                         break;
1421
1422                 count++;
1423
1424                 next_entry = (++priv->cur_rx) % rxsize;
1425                 p_next = priv->dma_rx + next_entry;
1426                 prefetch(p_next);
1427
1428                 /* read the status of the incoming frame */
1429                 status = (priv->hw->desc->rx_status(&priv->dev->stats,
1430                                                     &priv->xstats, p));
1431                 if (unlikely(status == discard_frame))
1432                         priv->dev->stats.rx_errors++;
1433                 else {
1434                         struct sk_buff *skb;
1435                         int frame_len;
1436
1437                         frame_len = priv->hw->desc->get_rx_frame_len(p,
1438                                         priv->plat->rx_coe);
1439                         /* ACS is set; GMAC core strips PAD/FCS for IEEE 802.3
1440                          * Type frames (LLC/LLC-SNAP) */
1441                         if (unlikely(status != llc_snap))
1442                                 frame_len -= ETH_FCS_LEN;
1443 #ifdef STMMAC_RX_DEBUG
1444                         if (frame_len > ETH_FRAME_LEN)
1445                                 pr_debug("\tRX frame size %d, COE status: %d\n",
1446                                         frame_len, status);
1447
1448                         if (netif_msg_hw(priv))
1449                                 pr_debug("\tdesc: %p [entry %d] buff=0x%x\n",
1450                                         p, entry, p->des2);
1451 #endif
1452                         skb = priv->rx_skbuff[entry];
1453                         if (unlikely(!skb)) {
1454                                 pr_err("%s: Inconsistent Rx descriptor chain\n",
1455                                         priv->dev->name);
1456                                 priv->dev->stats.rx_dropped++;
1457                                 break;
1458                         }
1459                         prefetch(skb->data - NET_IP_ALIGN);
1460                         priv->rx_skbuff[entry] = NULL;
1461
1462                         skb_put(skb, frame_len);
1463                         dma_unmap_single(priv->device,
1464                                          priv->rx_skbuff_dma[entry],
1465                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
1466 #ifdef STMMAC_RX_DEBUG
1467                         if (netif_msg_pktdata(priv)) {
1468                                 pr_info(" frame received (%dbytes)", frame_len);
1469                                 print_pkt(skb->data, frame_len);
1470                         }
1471 #endif
1472                         skb->protocol = eth_type_trans(skb, priv->dev);
1473
1474                         if (unlikely(!priv->plat->rx_coe)) {
1475                                 /* No RX COE for old mac10/100 devices */
1476                                 skb_checksum_none_assert(skb);
1477                                 netif_receive_skb(skb);
1478                         } else {
1479                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1480                                 napi_gro_receive(&priv->napi, skb);
1481                         }
1482
1483                         priv->dev->stats.rx_packets++;
1484                         priv->dev->stats.rx_bytes += frame_len;
1485                 }
1486                 entry = next_entry;
1487                 p = p_next;     /* use prefetched values */
1488         }
1489
1490         stmmac_rx_refill(priv);
1491
1492         priv->xstats.rx_pkt_n += count;
1493
1494         return count;
1495 }
1496
1497 /**
1498  *  stmmac_poll - stmmac poll method (NAPI)
1499  *  @napi : pointer to the napi structure.
1500  *  @budget : maximum number of packets that the current CPU can receive from
1501  *            all interfaces.
1502  *  Description :
1503  *   This function implements the the reception process.
1504  *   Also it runs the TX completion thread
1505  */
1506 static int stmmac_poll(struct napi_struct *napi, int budget)
1507 {
1508         struct stmmac_priv *priv = container_of(napi, struct stmmac_priv, napi);
1509         int work_done = 0;
1510
1511         priv->xstats.poll_n++;
1512         stmmac_tx(priv);
1513         work_done = stmmac_rx(priv, budget);
1514
1515         if (work_done < budget) {
1516                 napi_complete(napi);
1517                 stmmac_enable_irq(priv);
1518         }
1519         return work_done;
1520 }
1521
1522 /**
1523  *  stmmac_tx_timeout
1524  *  @dev : Pointer to net device structure
1525  *  Description: this function is called when a packet transmission fails to
1526  *   complete within a reasonable tmrate. The driver will mark the error in the
1527  *   netdev structure and arrange for the device to be reset to a sane state
1528  *   in order to transmit a new packet.
1529  */
1530 static void stmmac_tx_timeout(struct net_device *dev)
1531 {
1532         struct stmmac_priv *priv = netdev_priv(dev);
1533
1534         /* Clear Tx resources and restart transmitting again */
1535         stmmac_tx_err(priv);
1536 }
1537
1538 /* Configuration changes (passed on by ifconfig) */
1539 static int stmmac_config(struct net_device *dev, struct ifmap *map)
1540 {
1541         if (dev->flags & IFF_UP)        /* can't act on a running interface */
1542                 return -EBUSY;
1543
1544         /* Don't allow changing the I/O address */
1545         if (map->base_addr != dev->base_addr) {
1546                 pr_warning("%s: can't change I/O address\n", dev->name);
1547                 return -EOPNOTSUPP;
1548         }
1549
1550         /* Don't allow changing the IRQ */
1551         if (map->irq != dev->irq) {
1552                 pr_warning("%s: can't change IRQ number %d\n",
1553                        dev->name, dev->irq);
1554                 return -EOPNOTSUPP;
1555         }
1556
1557         /* ignore other fields */
1558         return 0;
1559 }
1560
1561 /**
1562  *  stmmac_set_rx_mode - entry point for multicast addressing
1563  *  @dev : pointer to the device structure
1564  *  Description:
1565  *  This function is a driver entry point which gets called by the kernel
1566  *  whenever multicast addresses must be enabled/disabled.
1567  *  Return value:
1568  *  void.
1569  */
1570 static void stmmac_set_rx_mode(struct net_device *dev)
1571 {
1572         struct stmmac_priv *priv = netdev_priv(dev);
1573
1574         spin_lock(&priv->lock);
1575         priv->hw->mac->set_filter(dev, priv->synopsys_id);
1576         spin_unlock(&priv->lock);
1577 }
1578
1579 /**
1580  *  stmmac_change_mtu - entry point to change MTU size for the device.
1581  *  @dev : device pointer.
1582  *  @new_mtu : the new MTU size for the device.
1583  *  Description: the Maximum Transfer Unit (MTU) is used by the network layer
1584  *  to drive packet transmission. Ethernet has an MTU of 1500 octets
1585  *  (ETH_DATA_LEN). This value can be changed with ifconfig.
1586  *  Return value:
1587  *  0 on success and an appropriate (-)ve integer as defined in errno.h
1588  *  file on failure.
1589  */
1590 static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
1591 {
1592         struct stmmac_priv *priv = netdev_priv(dev);
1593         int max_mtu;
1594
1595         if (netif_running(dev)) {
1596                 pr_err("%s: must be stopped to change its MTU\n", dev->name);
1597                 return -EBUSY;
1598         }
1599
1600         if (priv->plat->enh_desc)
1601                 max_mtu = JUMBO_LEN;
1602         else
1603                 max_mtu = SKB_MAX_HEAD(NET_SKB_PAD + NET_IP_ALIGN);
1604
1605         if ((new_mtu < 46) || (new_mtu > max_mtu)) {
1606                 pr_err("%s: invalid MTU, max MTU is: %d\n", dev->name, max_mtu);
1607                 return -EINVAL;
1608         }
1609
1610         dev->mtu = new_mtu;
1611         netdev_update_features(dev);
1612
1613         return 0;
1614 }
1615
1616 static netdev_features_t stmmac_fix_features(struct net_device *dev,
1617         netdev_features_t features)
1618 {
1619         struct stmmac_priv *priv = netdev_priv(dev);
1620
1621         if (priv->plat->rx_coe == STMMAC_RX_COE_NONE)
1622                 features &= ~NETIF_F_RXCSUM;
1623         else if (priv->plat->rx_coe == STMMAC_RX_COE_TYPE1)
1624                 features &= ~NETIF_F_IPV6_CSUM;
1625         if (!priv->plat->tx_coe)
1626                 features &= ~NETIF_F_ALL_CSUM;
1627
1628         /* Some GMAC devices have a bugged Jumbo frame support that
1629          * needs to have the Tx COE disabled for oversized frames
1630          * (due to limited buffer sizes). In this case we disable
1631          * the TX csum insertionin the TDES and not use SF. */
1632         if (priv->plat->bugged_jumbo && (dev->mtu > ETH_DATA_LEN))
1633                 features &= ~NETIF_F_ALL_CSUM;
1634
1635         return features;
1636 }
1637
1638 static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
1639 {
1640         struct net_device *dev = (struct net_device *)dev_id;
1641         struct stmmac_priv *priv = netdev_priv(dev);
1642
1643         if (unlikely(!dev)) {
1644                 pr_err("%s: invalid dev pointer\n", __func__);
1645                 return IRQ_NONE;
1646         }
1647
1648         /* To handle GMAC own interrupts */
1649         if (priv->plat->has_gmac) {
1650                 int status = priv->hw->mac->host_irq_status((void __iomem *)
1651                                                             dev->base_addr);
1652                 if (unlikely(status)) {
1653                         if (status & core_mmc_tx_irq)
1654                                 priv->xstats.mmc_tx_irq_n++;
1655                         if (status & core_mmc_rx_irq)
1656                                 priv->xstats.mmc_rx_irq_n++;
1657                         if (status & core_mmc_rx_csum_offload_irq)
1658                                 priv->xstats.mmc_rx_csum_offload_irq_n++;
1659                         if (status & core_irq_receive_pmt_irq)
1660                                 priv->xstats.irq_receive_pmt_irq_n++;
1661
1662                         /* For LPI we need to save the tx status */
1663                         if (status & core_irq_tx_path_in_lpi_mode) {
1664                                 priv->xstats.irq_tx_path_in_lpi_mode_n++;
1665                                 priv->tx_path_in_lpi_mode = true;
1666                         }
1667                         if (status & core_irq_tx_path_exit_lpi_mode) {
1668                                 priv->xstats.irq_tx_path_exit_lpi_mode_n++;
1669                                 priv->tx_path_in_lpi_mode = false;
1670                         }
1671                         if (status & core_irq_rx_path_in_lpi_mode)
1672                                 priv->xstats.irq_rx_path_in_lpi_mode_n++;
1673                         if (status & core_irq_rx_path_exit_lpi_mode)
1674                                 priv->xstats.irq_rx_path_exit_lpi_mode_n++;
1675                 }
1676         }
1677
1678         /* To handle DMA interrupts */
1679         stmmac_dma_interrupt(priv);
1680
1681         return IRQ_HANDLED;
1682 }
1683
1684 #ifdef CONFIG_NET_POLL_CONTROLLER
1685 /* Polling receive - used by NETCONSOLE and other diagnostic tools
1686  * to allow network I/O with interrupts disabled. */
1687 static void stmmac_poll_controller(struct net_device *dev)
1688 {
1689         disable_irq(dev->irq);
1690         stmmac_interrupt(dev->irq, dev);
1691         enable_irq(dev->irq);
1692 }
1693 #endif
1694
1695 /**
1696  *  stmmac_ioctl - Entry point for the Ioctl
1697  *  @dev: Device pointer.
1698  *  @rq: An IOCTL specefic structure, that can contain a pointer to
1699  *  a proprietary structure used to pass information to the driver.
1700  *  @cmd: IOCTL command
1701  *  Description:
1702  *  Currently there are no special functionality supported in IOCTL, just the
1703  *  phy_mii_ioctl(...) can be invoked.
1704  */
1705 static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1706 {
1707         struct stmmac_priv *priv = netdev_priv(dev);
1708         int ret;
1709
1710         if (!netif_running(dev))
1711                 return -EINVAL;
1712
1713         if (!priv->phydev)
1714                 return -EINVAL;
1715
1716         ret = phy_mii_ioctl(priv->phydev, rq, cmd);
1717
1718         return ret;
1719 }
1720
1721 #ifdef CONFIG_STMMAC_DEBUG_FS
1722 static struct dentry *stmmac_fs_dir;
1723 static struct dentry *stmmac_rings_status;
1724 static struct dentry *stmmac_dma_cap;
1725
1726 static int stmmac_sysfs_ring_read(struct seq_file *seq, void *v)
1727 {
1728         struct tmp_s {
1729                 u64 a;
1730                 unsigned int b;
1731                 unsigned int c;
1732         };
1733         int i;
1734         struct net_device *dev = seq->private;
1735         struct stmmac_priv *priv = netdev_priv(dev);
1736
1737         seq_printf(seq, "=======================\n");
1738         seq_printf(seq, " RX descriptor ring\n");
1739         seq_printf(seq, "=======================\n");
1740
1741         for (i = 0; i < priv->dma_rx_size; i++) {
1742                 struct tmp_s *x = (struct tmp_s *)(priv->dma_rx + i);
1743                 seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
1744                            i, (unsigned int)(x->a),
1745                            (unsigned int)((x->a) >> 32), x->b, x->c);
1746                 seq_printf(seq, "\n");
1747         }
1748
1749         seq_printf(seq, "\n");
1750         seq_printf(seq, "=======================\n");
1751         seq_printf(seq, "  TX descriptor ring\n");
1752         seq_printf(seq, "=======================\n");
1753
1754         for (i = 0; i < priv->dma_tx_size; i++) {
1755                 struct tmp_s *x = (struct tmp_s *)(priv->dma_tx + i);
1756                 seq_printf(seq, "[%d] DES0=0x%x DES1=0x%x BUF1=0x%x BUF2=0x%x",
1757                            i, (unsigned int)(x->a),
1758                            (unsigned int)((x->a) >> 32), x->b, x->c);
1759                 seq_printf(seq, "\n");
1760         }
1761
1762         return 0;
1763 }
1764
1765 static int stmmac_sysfs_ring_open(struct inode *inode, struct file *file)
1766 {
1767         return single_open(file, stmmac_sysfs_ring_read, inode->i_private);
1768 }
1769
1770 static const struct file_operations stmmac_rings_status_fops = {
1771         .owner = THIS_MODULE,
1772         .open = stmmac_sysfs_ring_open,
1773         .read = seq_read,
1774         .llseek = seq_lseek,
1775         .release = single_release,
1776 };
1777
1778 static int stmmac_sysfs_dma_cap_read(struct seq_file *seq, void *v)
1779 {
1780         struct net_device *dev = seq->private;
1781         struct stmmac_priv *priv = netdev_priv(dev);
1782
1783         if (!priv->hw_cap_support) {
1784                 seq_printf(seq, "DMA HW features not supported\n");
1785                 return 0;
1786         }
1787
1788         seq_printf(seq, "==============================\n");
1789         seq_printf(seq, "\tDMA HW features\n");
1790         seq_printf(seq, "==============================\n");
1791
1792         seq_printf(seq, "\t10/100 Mbps %s\n",
1793                    (priv->dma_cap.mbps_10_100) ? "Y" : "N");
1794         seq_printf(seq, "\t1000 Mbps %s\n",
1795                    (priv->dma_cap.mbps_1000) ? "Y" : "N");
1796         seq_printf(seq, "\tHalf duple %s\n",
1797                    (priv->dma_cap.half_duplex) ? "Y" : "N");
1798         seq_printf(seq, "\tHash Filter: %s\n",
1799                    (priv->dma_cap.hash_filter) ? "Y" : "N");
1800         seq_printf(seq, "\tMultiple MAC address registers: %s\n",
1801                    (priv->dma_cap.multi_addr) ? "Y" : "N");
1802         seq_printf(seq, "\tPCS (TBI/SGMII/RTBI PHY interfatces): %s\n",
1803                    (priv->dma_cap.pcs) ? "Y" : "N");
1804         seq_printf(seq, "\tSMA (MDIO) Interface: %s\n",
1805                    (priv->dma_cap.sma_mdio) ? "Y" : "N");
1806         seq_printf(seq, "\tPMT Remote wake up: %s\n",
1807                    (priv->dma_cap.pmt_remote_wake_up) ? "Y" : "N");
1808         seq_printf(seq, "\tPMT Magic Frame: %s\n",
1809                    (priv->dma_cap.pmt_magic_frame) ? "Y" : "N");
1810         seq_printf(seq, "\tRMON module: %s\n",
1811                    (priv->dma_cap.rmon) ? "Y" : "N");
1812         seq_printf(seq, "\tIEEE 1588-2002 Time Stamp: %s\n",
1813                    (priv->dma_cap.time_stamp) ? "Y" : "N");
1814         seq_printf(seq, "\tIEEE 1588-2008 Advanced Time Stamp:%s\n",
1815                    (priv->dma_cap.atime_stamp) ? "Y" : "N");
1816         seq_printf(seq, "\t802.3az - Energy-Efficient Ethernet (EEE) %s\n",
1817                    (priv->dma_cap.eee) ? "Y" : "N");
1818         seq_printf(seq, "\tAV features: %s\n", (priv->dma_cap.av) ? "Y" : "N");
1819         seq_printf(seq, "\tChecksum Offload in TX: %s\n",
1820                    (priv->dma_cap.tx_coe) ? "Y" : "N");
1821         seq_printf(seq, "\tIP Checksum Offload (type1) in RX: %s\n",
1822                    (priv->dma_cap.rx_coe_type1) ? "Y" : "N");
1823         seq_printf(seq, "\tIP Checksum Offload (type2) in RX: %s\n",
1824                    (priv->dma_cap.rx_coe_type2) ? "Y" : "N");
1825         seq_printf(seq, "\tRXFIFO > 2048bytes: %s\n",
1826                    (priv->dma_cap.rxfifo_over_2048) ? "Y" : "N");
1827         seq_printf(seq, "\tNumber of Additional RX channel: %d\n",
1828                    priv->dma_cap.number_rx_channel);
1829         seq_printf(seq, "\tNumber of Additional TX channel: %d\n",
1830                    priv->dma_cap.number_tx_channel);
1831         seq_printf(seq, "\tEnhanced descriptors: %s\n",
1832                    (priv->dma_cap.enh_desc) ? "Y" : "N");
1833
1834         return 0;
1835 }
1836
1837 static int stmmac_sysfs_dma_cap_open(struct inode *inode, struct file *file)
1838 {
1839         return single_open(file, stmmac_sysfs_dma_cap_read, inode->i_private);
1840 }
1841
1842 static const struct file_operations stmmac_dma_cap_fops = {
1843         .owner = THIS_MODULE,
1844         .open = stmmac_sysfs_dma_cap_open,
1845         .read = seq_read,
1846         .llseek = seq_lseek,
1847         .release = single_release,
1848 };
1849
1850 static int stmmac_init_fs(struct net_device *dev)
1851 {
1852         /* Create debugfs entries */
1853         stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);
1854
1855         if (!stmmac_fs_dir || IS_ERR(stmmac_fs_dir)) {
1856                 pr_err("ERROR %s, debugfs create directory failed\n",
1857                        STMMAC_RESOURCE_NAME);
1858
1859                 return -ENOMEM;
1860         }
1861
1862         /* Entry to report DMA RX/TX rings */
1863         stmmac_rings_status = debugfs_create_file("descriptors_status",
1864                                            S_IRUGO, stmmac_fs_dir, dev,
1865                                            &stmmac_rings_status_fops);
1866
1867         if (!stmmac_rings_status || IS_ERR(stmmac_rings_status)) {
1868                 pr_info("ERROR creating stmmac ring debugfs file\n");
1869                 debugfs_remove(stmmac_fs_dir);
1870
1871                 return -ENOMEM;
1872         }
1873
1874         /* Entry to report the DMA HW features */
1875         stmmac_dma_cap = debugfs_create_file("dma_cap", S_IRUGO, stmmac_fs_dir,
1876                                              dev, &stmmac_dma_cap_fops);
1877
1878         if (!stmmac_dma_cap || IS_ERR(stmmac_dma_cap)) {
1879                 pr_info("ERROR creating stmmac MMC debugfs file\n");
1880                 debugfs_remove(stmmac_rings_status);
1881                 debugfs_remove(stmmac_fs_dir);
1882
1883                 return -ENOMEM;
1884         }
1885
1886         return 0;
1887 }
1888
1889 static void stmmac_exit_fs(void)
1890 {
1891         debugfs_remove(stmmac_rings_status);
1892         debugfs_remove(stmmac_dma_cap);
1893         debugfs_remove(stmmac_fs_dir);
1894 }
1895 #endif /* CONFIG_STMMAC_DEBUG_FS */
1896
1897 static const struct net_device_ops stmmac_netdev_ops = {
1898         .ndo_open = stmmac_open,
1899         .ndo_start_xmit = stmmac_xmit,
1900         .ndo_stop = stmmac_release,
1901         .ndo_change_mtu = stmmac_change_mtu,
1902         .ndo_fix_features = stmmac_fix_features,
1903         .ndo_set_rx_mode = stmmac_set_rx_mode,
1904         .ndo_tx_timeout = stmmac_tx_timeout,
1905         .ndo_do_ioctl = stmmac_ioctl,
1906         .ndo_set_config = stmmac_config,
1907 #ifdef CONFIG_NET_POLL_CONTROLLER
1908         .ndo_poll_controller = stmmac_poll_controller,
1909 #endif
1910         .ndo_set_mac_address = eth_mac_addr,
1911 };
1912
1913 /**
1914  *  stmmac_hw_init - Init the MAC device
1915  *  @priv : pointer to the private device structure.
1916  *  Description: this function detects which MAC device
1917  *  (GMAC/MAC10-100) has to attached, checks the HW capability
1918  *  (if supported) and sets the driver's features (for example
1919  *  to use the ring or chaine mode or support the normal/enh
1920  *  descriptor structure).
1921  */
1922 static int stmmac_hw_init(struct stmmac_priv *priv)
1923 {
1924         int ret = 0;
1925         struct mac_device_info *mac;
1926
1927         /* Identify the MAC HW device */
1928         if (priv->plat->has_gmac) {
1929                 priv->dev->priv_flags |= IFF_UNICAST_FLT;
1930                 mac = dwmac1000_setup(priv->ioaddr);
1931         } else {
1932                 mac = dwmac100_setup(priv->ioaddr);
1933         }
1934         if (!mac)
1935                 return -ENOMEM;
1936
1937         priv->hw = mac;
1938
1939         /* To use the chained or ring mode */
1940         priv->hw->ring = &ring_mode_ops;
1941
1942         /* Get and dump the chip ID */
1943         priv->synopsys_id = stmmac_get_synopsys_id(priv);
1944
1945         /* Get the HW capability (new GMAC newer than 3.50a) */
1946         priv->hw_cap_support = stmmac_get_hw_features(priv);
1947         if (priv->hw_cap_support) {
1948                 pr_info(" DMA HW capability register supported");
1949
1950                 /* We can override some gmac/dma configuration fields: e.g.
1951                  * enh_desc, tx_coe (e.g. that are passed through the
1952                  * platform) with the values from the HW capability
1953                  * register (if supported).
1954                  */
1955                 priv->plat->enh_desc = priv->dma_cap.enh_desc;
1956                 priv->plat->pmt = priv->dma_cap.pmt_remote_wake_up;
1957
1958                 priv->plat->tx_coe = priv->dma_cap.tx_coe;
1959
1960                 if (priv->dma_cap.rx_coe_type2)
1961                         priv->plat->rx_coe = STMMAC_RX_COE_TYPE2;
1962                 else if (priv->dma_cap.rx_coe_type1)
1963                         priv->plat->rx_coe = STMMAC_RX_COE_TYPE1;
1964
1965         } else
1966                 pr_info(" No HW DMA feature register supported");
1967
1968         /* Select the enhnaced/normal descriptor structures */
1969         stmmac_selec_desc_mode(priv);
1970
1971         /* Enable the IPC (Checksum Offload) and check if the feature has been
1972          * enabled during the core configuration. */
1973         ret = priv->hw->mac->rx_ipc(priv->ioaddr);
1974         if (!ret) {
1975                 pr_warning(" RX IPC Checksum Offload not configured.\n");
1976                 priv->plat->rx_coe = STMMAC_RX_COE_NONE;
1977         }
1978
1979         if (priv->plat->rx_coe)
1980                 pr_info(" RX Checksum Offload Engine supported (type %d)\n",
1981                         priv->plat->rx_coe);
1982         if (priv->plat->tx_coe)
1983                 pr_info(" TX Checksum insertion supported\n");
1984
1985         if (priv->plat->pmt) {
1986                 pr_info(" Wake-Up On Lan supported\n");
1987                 device_set_wakeup_capable(priv->device, 1);
1988         }
1989
1990         return ret;
1991 }
1992
1993 /**
1994  * stmmac_dvr_probe
1995  * @device: device pointer
1996  * @plat_dat: platform data pointer
1997  * @addr: iobase memory address
1998  * Description: this is the main probe function used to
1999  * call the alloc_etherdev, allocate the priv structure.
2000  */
2001 struct stmmac_priv *stmmac_dvr_probe(struct device *device,
2002                                      struct plat_stmmacenet_data *plat_dat,
2003                                      void __iomem *addr)
2004 {
2005         int ret = 0;
2006         struct net_device *ndev = NULL;
2007         struct stmmac_priv *priv;
2008
2009         ndev = alloc_etherdev(sizeof(struct stmmac_priv));
2010         if (!ndev)
2011                 return NULL;
2012
2013         SET_NETDEV_DEV(ndev, device);
2014
2015         priv = netdev_priv(ndev);
2016         priv->device = device;
2017         priv->dev = ndev;
2018
2019         ether_setup(ndev);
2020
2021         stmmac_set_ethtool_ops(ndev);
2022         priv->pause = pause;
2023         priv->plat = plat_dat;
2024         priv->ioaddr = addr;
2025         priv->dev->base_addr = (unsigned long)addr;
2026
2027         /* Verify driver arguments */
2028         stmmac_verify_args();
2029
2030         /* Override with kernel parameters if supplied XXX CRS XXX
2031          * this needs to have multiple instances */
2032         if ((phyaddr >= 0) && (phyaddr <= 31))
2033                 priv->plat->phy_addr = phyaddr;
2034
2035         /* Init MAC and get the capabilities */
2036         stmmac_hw_init(priv);
2037
2038         ndev->netdev_ops = &stmmac_netdev_ops;
2039
2040         ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
2041                             NETIF_F_RXCSUM;
2042         ndev->features |= ndev->hw_features | NETIF_F_HIGHDMA;
2043         ndev->watchdog_timeo = msecs_to_jiffies(watchdog);
2044 #ifdef STMMAC_VLAN_TAG_USED
2045         /* Both mac100 and gmac support receive VLAN tag detection */
2046         ndev->features |= NETIF_F_HW_VLAN_RX;
2047 #endif
2048         priv->msg_enable = netif_msg_init(debug, default_msg_level);
2049
2050         if (flow_ctrl)
2051                 priv->flow_ctrl = FLOW_AUTO;    /* RX/TX pause on */
2052
2053         netif_napi_add(ndev, &priv->napi, stmmac_poll, 64);
2054
2055         spin_lock_init(&priv->lock);
2056         spin_lock_init(&priv->tx_lock);
2057
2058         ret = register_netdev(ndev);
2059         if (ret) {
2060                 pr_err("%s: ERROR %i registering the device\n", __func__, ret);
2061                 goto error_netdev_register;
2062         }
2063
2064         priv->stmmac_clk = clk_get(priv->device, STMMAC_RESOURCE_NAME);
2065         if (IS_ERR(priv->stmmac_clk)) {
2066                 pr_warning("%s: warning: cannot get CSR clock\n", __func__);
2067                 goto error_clk_get;
2068         }
2069
2070         /* If a specific clk_csr value is passed from the platform
2071          * this means that the CSR Clock Range selection cannot be
2072          * changed at run-time and it is fixed. Viceversa the driver'll try to
2073          * set the MDC clock dynamically according to the csr actual
2074          * clock input.
2075          */
2076         if (!priv->plat->clk_csr)
2077                 stmmac_clk_csr_set(priv);
2078         else
2079                 priv->clk_csr = priv->plat->clk_csr;
2080
2081         /* MDIO bus Registration */
2082         ret = stmmac_mdio_register(ndev);
2083         if (ret < 0) {
2084                 pr_debug("%s: MDIO bus (id: %d) registration failed",
2085                          __func__, priv->plat->bus_id);
2086                 goto error_mdio_register;
2087         }
2088
2089         return priv;
2090
2091 error_mdio_register:
2092         clk_put(priv->stmmac_clk);
2093 error_clk_get:
2094         unregister_netdev(ndev);
2095 error_netdev_register:
2096         netif_napi_del(&priv->napi);
2097         free_netdev(ndev);
2098
2099         return NULL;
2100 }
2101
2102 /**
2103  * stmmac_dvr_remove
2104  * @ndev: net device pointer
2105  * Description: this function resets the TX/RX processes, disables the MAC RX/TX
2106  * changes the link status, releases the DMA descriptor rings.
2107  */
2108 int stmmac_dvr_remove(struct net_device *ndev)
2109 {
2110         struct stmmac_priv *priv = netdev_priv(ndev);
2111
2112         pr_info("%s:\n\tremoving driver", __func__);
2113
2114         priv->hw->dma->stop_rx(priv->ioaddr);
2115         priv->hw->dma->stop_tx(priv->ioaddr);
2116
2117         stmmac_set_mac(priv->ioaddr, false);
2118         stmmac_mdio_unregister(ndev);
2119         netif_carrier_off(ndev);
2120         unregister_netdev(ndev);
2121         free_netdev(ndev);
2122
2123         return 0;
2124 }
2125
2126 #ifdef CONFIG_PM
2127 int stmmac_suspend(struct net_device *ndev)
2128 {
2129         struct stmmac_priv *priv = netdev_priv(ndev);
2130         int dis_ic = 0;
2131         unsigned long flags;
2132
2133         if (!ndev || !netif_running(ndev))
2134                 return 0;
2135
2136         if (priv->phydev)
2137                 phy_stop(priv->phydev);
2138
2139         spin_lock_irqsave(&priv->lock, flags);
2140
2141         netif_device_detach(ndev);
2142         netif_stop_queue(ndev);
2143
2144 #ifdef CONFIG_STMMAC_TIMER
2145         priv->tm->timer_stop();
2146         if (likely(priv->tm->enable))
2147                 dis_ic = 1;
2148 #endif
2149         napi_disable(&priv->napi);
2150
2151         /* Stop TX/RX DMA */
2152         priv->hw->dma->stop_tx(priv->ioaddr);
2153         priv->hw->dma->stop_rx(priv->ioaddr);
2154         /* Clear the Rx/Tx descriptors */
2155         priv->hw->desc->init_rx_desc(priv->dma_rx, priv->dma_rx_size,
2156                                      dis_ic);
2157         priv->hw->desc->init_tx_desc(priv->dma_tx, priv->dma_tx_size);
2158
2159         /* Enable Power down mode by programming the PMT regs */
2160         if (device_may_wakeup(priv->device))
2161                 priv->hw->mac->pmt(priv->ioaddr, priv->wolopts);
2162         else {
2163                 stmmac_set_mac(priv->ioaddr, false);
2164                 /* Disable clock in case of PWM is off */
2165                 clk_disable_unprepare(priv->stmmac_clk);
2166         }
2167         spin_unlock_irqrestore(&priv->lock, flags);
2168         return 0;
2169 }
2170
2171 int stmmac_resume(struct net_device *ndev)
2172 {
2173         struct stmmac_priv *priv = netdev_priv(ndev);
2174         unsigned long flags;
2175
2176         if (!netif_running(ndev))
2177                 return 0;
2178
2179         spin_lock_irqsave(&priv->lock, flags);
2180
2181         /* Power Down bit, into the PM register, is cleared
2182          * automatically as soon as a magic packet or a Wake-up frame
2183          * is received. Anyway, it's better to manually clear
2184          * this bit because it can generate problems while resuming
2185          * from another devices (e.g. serial console). */
2186         if (device_may_wakeup(priv->device))
2187                 priv->hw->mac->pmt(priv->ioaddr, 0);
2188         else
2189                 /* enable the clk prevously disabled */
2190                 clk_prepare_enable(priv->stmmac_clk);
2191
2192         netif_device_attach(ndev);
2193
2194         /* Enable the MAC and DMA */
2195         stmmac_set_mac(priv->ioaddr, true);
2196         priv->hw->dma->start_tx(priv->ioaddr);
2197         priv->hw->dma->start_rx(priv->ioaddr);
2198
2199 #ifdef CONFIG_STMMAC_TIMER
2200         if (likely(priv->tm->enable))
2201                 priv->tm->timer_start(tmrate);
2202 #endif
2203         napi_enable(&priv->napi);
2204
2205         netif_start_queue(ndev);
2206
2207         spin_unlock_irqrestore(&priv->lock, flags);
2208
2209         if (priv->phydev)
2210                 phy_start(priv->phydev);
2211
2212         return 0;
2213 }
2214
2215 int stmmac_freeze(struct net_device *ndev)
2216 {
2217         if (!ndev || !netif_running(ndev))
2218                 return 0;
2219
2220         return stmmac_release(ndev);
2221 }
2222
2223 int stmmac_restore(struct net_device *ndev)
2224 {
2225         if (!ndev || !netif_running(ndev))
2226                 return 0;
2227
2228         return stmmac_open(ndev);
2229 }
2230 #endif /* CONFIG_PM */
2231
2232 /* Driver can be configured w/ and w/ both PCI and Platf drivers
2233  * depending on the configuration selected.
2234  */
2235 static int __init stmmac_init(void)
2236 {
2237         int err_plt = 0;
2238         int err_pci = 0;
2239
2240         err_plt = stmmac_register_platform();
2241         err_pci = stmmac_register_pci();
2242
2243         if ((err_pci) && (err_plt)) {
2244                 pr_err("stmmac: driver registration failed\n");
2245                 return -EINVAL;
2246         }
2247
2248         return 0;
2249 }
2250
2251 static void __exit stmmac_exit(void)
2252 {
2253         stmmac_unregister_platform();
2254         stmmac_unregister_pci();
2255 }
2256
2257 module_init(stmmac_init);
2258 module_exit(stmmac_exit);
2259
2260 #ifndef MODULE
2261 static int __init stmmac_cmdline_opt(char *str)
2262 {
2263         char *opt;
2264
2265         if (!str || !*str)
2266                 return -EINVAL;
2267         while ((opt = strsep(&str, ",")) != NULL) {
2268                 if (!strncmp(opt, "debug:", 6)) {
2269                         if (kstrtoint(opt + 6, 0, &debug))
2270                                 goto err;
2271                 } else if (!strncmp(opt, "phyaddr:", 8)) {
2272                         if (kstrtoint(opt + 8, 0, &phyaddr))
2273                                 goto err;
2274                 } else if (!strncmp(opt, "dma_txsize:", 11)) {
2275                         if (kstrtoint(opt + 11, 0, &dma_txsize))
2276                                 goto err;
2277                 } else if (!strncmp(opt, "dma_rxsize:", 11)) {
2278                         if (kstrtoint(opt + 11, 0, &dma_rxsize))
2279                                 goto err;
2280                 } else if (!strncmp(opt, "buf_sz:", 7)) {
2281                         if (kstrtoint(opt + 7, 0, &buf_sz))
2282                                 goto err;
2283                 } else if (!strncmp(opt, "tc:", 3)) {
2284                         if (kstrtoint(opt + 3, 0, &tc))
2285                                 goto err;
2286                 } else if (!strncmp(opt, "watchdog:", 9)) {
2287                         if (kstrtoint(opt + 9, 0, &watchdog))
2288                                 goto err;
2289                 } else if (!strncmp(opt, "flow_ctrl:", 10)) {
2290                         if (kstrtoint(opt + 10, 0, &flow_ctrl))
2291                                 goto err;
2292                 } else if (!strncmp(opt, "pause:", 6)) {
2293                         if (kstrtoint(opt + 6, 0, &pause))
2294                                 goto err;
2295                 } else if (!strncmp(opt, "eee_timer:", 6)) {
2296                         if (kstrtoint(opt + 10, 0, &eee_timer))
2297                                 goto err;
2298 #ifdef CONFIG_STMMAC_TIMER
2299                 } else if (!strncmp(opt, "tmrate:", 7)) {
2300                         if (kstrtoint(opt + 7, 0, &tmrate))
2301                                 goto err;
2302 #endif
2303                 }
2304         }
2305         return 0;
2306
2307 err:
2308         pr_err("%s: ERROR broken module parameter conversion", __func__);
2309         return -EINVAL;
2310 }
2311
2312 __setup("stmmaceth=", stmmac_cmdline_opt);
2313 #endif
2314
2315 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet device driver");
2316 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
2317 MODULE_LICENSE("GPL");