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_XMIT_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 #define DMA_BUFFER_SIZE BUF_SIZE_2KiB
 119 static int buf_sz = DMA_BUFFER_SIZE;
 120 module_param(buf_sz, int, S_IRUGO | S_IWUSR);
 121 MODULE_PARM_DESC(buf_sz, "DMA buffer size");
 122
 123 static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE |
 124                                       NETIF_MSG_LINK | NETIF_MSG_IFUP |
 125                                       NETIF_MSG_IFDOWN | NETIF_MSG_TIMER);
 126
 127 #define STMMAC_DEFAULT_LPI_TIMER        1000
 128 static int eee_timer = STMMAC_DEFAULT_LPI_TIMER;
 129 module_param(eee_timer, int, S_IRUGO | S_IWUSR);
 130 MODULE_PARM_DESC(eee_timer, "LPI tx expiration time in msec");
 131 #define STMMAC_LPI_TIMER(x) (jiffies + msecs_to_jiffies(x))
 132
 133 /* By default the driver will use the ring mode to manage tx and rx descriptors
 134  * but passing this value so user can force to use the chain instead of the ring
 135  */
 136 static unsigned int chain_mode;
 137 module_param(chain_mode, int, S_IRUGO);
 138 MODULE_PARM_DESC(chain_mode, "To use chain instead of ring mode");
 139
 140 static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
 141
 142 #ifdef CONFIG_STMMAC_DEBUG_FS
 143 static int stmmac_init_fs(struct net_device *dev);
 144 static void stmmac_exit_fs(void);
 145 #endif
 146
 147 #define STMMAC_COAL_TIMER(x) (jiffies + usecs_to_jiffies(x))
 148
 149 /**
 150  * stmmac_verify_args - verify the driver parameters.
 151  * Description: it verifies if some wrong parameter is passed to the driver.
 152  * Note that wrong parameters are replaced with the default values.
 153  */
 154 static void stmmac_verify_args(void)
 155 {
 156         if (unlikely(watchdog < 0))
 157                 watchdog = TX_TIMEO;
 158         if (unlikely(dma_rxsize < 0))
 159                 dma_rxsize = DMA_RX_SIZE;
 160         if (unlikely(dma_txsize < 0))
 161                 dma_txsize = DMA_TX_SIZE;
 162         if (unlikely((buf_sz < DMA_BUFFER_SIZE) || (buf_sz > BUF_SIZE_16KiB)))
 163                 buf_sz = DMA_BUFFER_SIZE;
 164         if (unlikely(flow_ctrl > 1))
 165                 flow_ctrl = FLOW_AUTO;
 166         else if (likely(flow_ctrl < 0))
 167                 flow_ctrl = FLOW_OFF;
 168         if (unlikely((pause < 0) || (pause > 0xffff)))
 169                 pause = PAUSE_TIME;
 170         if (eee_timer < 0)
 171                 eee_timer = STMMAC_DEFAULT_LPI_TIMER;
 172 }
 173
 174 static void stmmac_clk_csr_set(struct stmmac_priv *priv)
 175 {
 176         u32 clk_rate;
 177
 178         clk_rate = clk_get_rate(priv->stmmac_clk);
 179
 180         /* Platform provided default clk_csr would be assumed valid
 181          * for all other cases except for the below mentioned ones. */
 182         if (!(priv->clk_csr & MAC_CSR_H_FRQ_MASK)) {
 183                 if (clk_rate < CSR_F_35M)
 184                         priv->clk_csr = STMMAC_CSR_20_35M;
 185                 else if ((clk_rate >= CSR_F_35M) && (clk_rate < CSR_F_60M))
 186                         priv->clk_csr = STMMAC_CSR_35_60M;
 187                 else if ((clk_rate >= CSR_F_60M) && (clk_rate < CSR_F_100M))
 188                         priv->clk_csr = STMMAC_CSR_60_100M;
 189                 else if ((clk_rate >= CSR_F_100M) && (clk_rate < CSR_F_150M))
 190                         priv->clk_csr = STMMAC_CSR_100_150M;
 191                 else if ((clk_rate >= CSR_F_150M) && (clk_rate < CSR_F_250M))
 192                         priv->clk_csr = STMMAC_CSR_150_250M;
 193                 else if ((clk_rate >= CSR_F_250M) && (clk_rate < CSR_F_300M))
 194                         priv->clk_csr = STMMAC_CSR_250_300M;
 195         } /* For values higher than the IEEE 802.3 specified frequency
 196            * we can not estimate the proper divider as it is not known
 197            * the frequency of clk_csr_i. So we do not change the default
 198            * divider. */
 199 }
 200
 201 #if defined(STMMAC_XMIT_DEBUG) || defined(STMMAC_RX_DEBUG)
 202 static void print_pkt(unsigned char *buf, int len)
 203 {
 204         int j;
 205         pr_info("len = %d byte, buf addr: 0x%p", len, buf);
 206         for (j = 0; j < len; j++) {
 207                 if ((j % 16) == 0)
 208                         pr_info("\n %03x:", j);
 209                 pr_info(" %02x", buf[j]);
 210         }
 211         pr_info("\n");
 212 }
 213 #endif
 214
 215 /* minimum number of free TX descriptors required to wake up TX process */
 216 #define STMMAC_TX_THRESH(x)     (x->dma_tx_size/4)
 217
 218 static inline u32 stmmac_tx_avail(struct stmmac_priv *priv)
 219 {
 220         return priv->dirty_tx + priv->dma_tx_size - priv->cur_tx - 1;
 221 }
 222
 223 /* On some ST platforms, some HW system configuraton registers have to be
 224  * set according to the link speed negotiated.
 225  */
 226 static inline void stmmac_hw_fix_mac_speed(struct stmmac_priv *priv)
 227 {
 228         struct phy_device *phydev = priv->phydev;
 229
 230         if (likely(priv->plat->fix_mac_speed))
 231                 priv->plat->fix_mac_speed(priv->plat->bsp_priv,
 232                                           phydev->speed);
 233 }
 234
 235 static void stmmac_enable_eee_mode(struct stmmac_priv *priv)
 236 {
 237         /* Check and enter in LPI mode */
 238         if ((priv->dirty_tx == priv->cur_tx) &&
 239             (priv->tx_path_in_lpi_mode == false))
 240                 priv->hw->mac->set_eee_mode(priv->ioaddr);
 241 }
 242
 243 void stmmac_disable_eee_mode(struct stmmac_priv *priv)
 244 {
 245         /* Exit and disable EEE in case of we are are in LPI state. */
 246         priv->hw->mac->reset_eee_mode(priv->ioaddr);
 247         del_timer_sync(&priv->eee_ctrl_timer);
 248         priv->tx_path_in_lpi_mode = false;
 249 }
 250
 251 /**
 252  * stmmac_eee_ctrl_timer
 253  * @arg : data hook
 254  * Description:
 255  *  If there is no data transfer and if we are not in LPI state,
 256  *  then MAC Transmitter can be moved to LPI state.
 257  */
 258 static void stmmac_eee_ctrl_timer(unsigned long arg)
 259 {
 260         struct stmmac_priv *priv = (struct stmmac_priv *)arg;
 261
 262         stmmac_enable_eee_mode(priv);
 263         mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_TIMER(eee_timer));
 264 }
 265
 266 /**
 267  * stmmac_eee_init
 268  * @priv: private device pointer
 269  * Description:
 270  *  If the EEE support has been enabled while configuring the driver,
 271  *  if the GMAC actually supports the EEE (from the HW cap reg) and the
 272  *  phy can also manage EEE, so enable the LPI state and start the timer
 273  *  to verify if the tx path can enter in LPI state.
 274  */
 275 bool stmmac_eee_init(struct stmmac_priv *priv)
 276 {
 277         bool ret = false;
 278
 279         /* MAC core supports the EEE feature. */
 280         if (priv->dma_cap.eee) {
 281                 /* Check if the PHY supports EEE */
 282                 if (phy_init_eee(priv->phydev, 1))
 283                         goto out;
 284
 285                 priv->eee_active = 1;
 286                 init_timer(&priv->eee_ctrl_timer);
 287                 priv->eee_ctrl_timer.function = stmmac_eee_ctrl_timer;
 288                 priv->eee_ctrl_timer.data = (unsigned long)priv;
 289                 priv->eee_ctrl_timer.expires = STMMAC_LPI_TIMER(eee_timer);
 290                 add_timer(&priv->eee_ctrl_timer);
 291
 292                 priv->hw->mac->set_eee_timer(priv->ioaddr,
 293                                              STMMAC_DEFAULT_LIT_LS_TIMER,
 294                                              priv->tx_lpi_timer);
 295
 296                 pr_info("stmmac: Energy-Efficient Ethernet initialized\n");
 297
 298                 ret = true;
 299         }
 300 out:
 301         return ret;
 302 }
 303
 304 static void stmmac_eee_adjust(struct stmmac_priv *priv)
 305 {
 306         /* When the EEE has been already initialised we have to
 307          * modify the PLS bit in the LPI ctrl & status reg according
 308          * to the PHY link status. For this reason.
 309          */
 310         if (priv->eee_enabled)
 311                 priv->hw->mac->set_eee_pls(priv->ioaddr, priv->phydev->link);
 312 }
 313
 314 /**
 315  * stmmac_adjust_link
 316  * @dev: net device structure
 317  * Description: it adjusts the link parameters.
 318  */
 319 static void stmmac_adjust_link(struct net_device *dev)
 320 {
 321         struct stmmac_priv *priv = netdev_priv(dev);
 322         struct phy_device *phydev = priv->phydev;
 323         unsigned long flags;
 324         int new_state = 0;
 325         unsigned int fc = priv->flow_ctrl, pause_time = priv->pause;
 326
 327         if (phydev == NULL)
 328                 return;
 329
 330         DBG(probe, DEBUG, "stmmac_adjust_link: called.  address %d link %d\n",
 331             phydev->addr, phydev->link);
 332
 333         spin_lock_irqsave(&priv->lock, flags);
 334
 335         if (phydev->link) {
 336                 u32 ctrl = readl(priv->ioaddr + MAC_CTRL_REG);
 337
 338                 /* Now we make sure that we can be in full duplex mode.
 339                  * If not, we operate in half-duplex mode. */
 340                 if (phydev->duplex != priv->oldduplex) {
 341                         new_state = 1;
 342                         if (!(phydev->duplex))
 343                                 ctrl &= ~priv->hw->link.duplex;
 344                         else
 345                                 ctrl |= priv->hw->link.duplex;
 346                         priv->oldduplex = phydev->duplex;
 347                 }
 348                 /* Flow Control operation */
 349                 if (phydev->pause)
 350                         priv->hw->mac->flow_ctrl(priv->ioaddr, phydev->duplex,
 351                                                  fc, pause_time);
 352
 353                 if (phydev->speed != priv->speed) {
 354                         new_state = 1;
 355                         switch (phydev->speed) {
 356                         case 1000:
 357                                 if (likely(priv->plat->has_gmac))
 358                                         ctrl &= ~priv->hw->link.port;
 359                                         stmmac_hw_fix_mac_speed(priv);
 360                                 break;
 361                         case 100:
 362                         case 10:
 363                                 if (priv->plat->has_gmac) {
 364                                         ctrl |= priv->hw->link.port;
 365                                         if (phydev->speed == SPEED_100) {
 366                                                 ctrl |= priv->hw->link.speed;
 367                                         } else {
 368                                                 ctrl &= ~(priv->hw->link.speed);
 369                                         }
 370                                 } else {
 371                                         ctrl &= ~priv->hw->link.port;
 372                                 }
 373                                 stmmac_hw_fix_mac_speed(priv);
 374                                 break;
 375                         default:
 376                                 if (netif_msg_link(priv))
 377                                         pr_warning("%s: Speed (%d) is not 10"
 378                                        " or 100!\n", dev->name, phydev->speed);
 379                                 break;
 380                         }
 381
 382                         priv->speed = phydev->speed;
 383                 }
 384
 385                 writel(ctrl, priv->ioaddr + MAC_CTRL_REG);
 386
 387                 if (!priv->oldlink) {
 388                         new_state = 1;
 389                         priv->oldlink = 1;
 390                 }
 391         } else if (priv->oldlink) {
 392                 new_state = 1;
 393                 priv->oldlink = 0;
 394                 priv->speed = 0;
 395                 priv->oldduplex = -1;
 396         }
 397
 398         if (new_state && netif_msg_link(priv))
 399                 phy_print_status(phydev);
 400
 401         stmmac_eee_adjust(priv);
 402
 403         spin_unlock_irqrestore(&priv->lock, flags);
 404
 405         DBG(probe, DEBUG, "stmmac_adjust_link: exiting\n");
 406 }
 407
 408 /**
 409  * stmmac_init_phy - PHY initialization
 410  * @dev: net device structure
 411  * Description: it initializes the driver's PHY state, and attaches the PHY
 412  * to the mac driver.
 413  *  Return value:
 414  *  0 on success
 415  */
 416 static int stmmac_init_phy(struct net_device *dev)
 417 {
 418         struct stmmac_priv *priv = netdev_priv(dev);
 419         struct phy_device *phydev;
 420         char phy_id_fmt[MII_BUS_ID_SIZE + 3];
 421         char bus_id[MII_BUS_ID_SIZE];
 422         int interface = priv->plat->interface;
 423         priv->oldlink = 0;
 424         priv->speed = 0;
 425         priv->oldduplex = -1;
 426
 427         if (priv->plat->phy_bus_name)
 428                 snprintf(bus_id, MII_BUS_ID_SIZE, "%s-%x",
 429                                 priv->plat->phy_bus_name, priv->plat->bus_id);
 430         else
 431                 snprintf(bus_id, MII_BUS_ID_SIZE, "stmmac-%x",
 432                                 priv->plat->bus_id);
 433
 434         snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id,
 435                  priv->plat->phy_addr);
 436         pr_debug("stmmac_init_phy:  trying to attach to %s\n", phy_id_fmt);
 437
 438         phydev = phy_connect(dev, phy_id_fmt, &stmmac_adjust_link, interface);
 439
 440         if (IS_ERR(phydev)) {
 441                 pr_err("%s: Could not attach to PHY\n", dev->name);
 442                 return PTR_ERR(phydev);
 443         }
 444
 445         /* Stop Advertising 1000BASE Capability if interface is not GMII */
 446         if ((interface == PHY_INTERFACE_MODE_MII) ||
 447             (interface == PHY_INTERFACE_MODE_RMII))
 448                 phydev->advertising &= ~(SUPPORTED_1000baseT_Half |
 449                                          SUPPORTED_1000baseT_Full);
 450
 451         /*
 452          * Broken HW is sometimes missing the pull-up resistor on the
 453          * MDIO line, which results in reads to non-existent devices returning
 454          * 0 rather than 0xffff. Catch this here and treat 0 as a non-existent
 455          * device as well.
 456          * Note: phydev->phy_id is the result of reading the UID PHY registers.
 457          */
 458         if (phydev->phy_id == 0) {
 459                 phy_disconnect(phydev);
 460                 return -ENODEV;
 461         }
 462         pr_debug("stmmac_init_phy:  %s: attached to PHY (UID 0x%x)"
 463                  " Link = %d\n", dev->name, phydev->phy_id, phydev->link);
 464
 465         priv->phydev = phydev;
 466
 467         return 0;
 468 }
 469
 470 /**
 471  * stmmac_display_ring
 472  * @p: pointer to the ring.
 473  * @size: size of the ring.
 474  * Description: display the control/status and buffer descriptors.
 475  */
 476 static void stmmac_display_ring(void *head, int size, int extend_desc)
 477 {
 478         int i;
 479         struct dma_extended_desc *ep = (struct dma_extended_desc *) head;
 480         struct dma_desc *p = (struct dma_desc *) head;
 481
 482         for (i = 0; i < size; i++) {
 483                 u64 x;
 484                 if (extend_desc) {
 485                         x = *(u64 *) ep;
 486                         pr_info("%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
 487                                 i, (unsigned int) virt_to_phys(ep),
 488                                 (unsigned int) x, (unsigned int) (x >> 32),
 489                                 ep->basic.des2, ep->basic.des3);
 490                         ep++;
 491                 } else {
 492                         x = *(u64 *) p;
 493                         pr_info("%d [0x%x]: 0x%x 0x%x 0x%x 0x%x",
 494                                 i, (unsigned int) virt_to_phys(p),
 495                                 (unsigned int) x, (unsigned int) (x >> 32),
 496                                 p->des2, p->des3);
 497                         p++;
 498                 }
 499                 pr_info("\n");
 500         }
 501 }
 502
 503 static void stmmac_display_rings(struct stmmac_priv *priv)
 504 {
 505         unsigned int txsize = priv->dma_tx_size;
 506         unsigned int rxsize = priv->dma_rx_size;
 507
 508         if (priv->extend_desc) {
 509                 pr_info("Extended RX descriptor ring:\n");
 510                 stmmac_display_ring((void *) priv->dma_erx, rxsize, 1);
 511                 pr_info("Extended TX descriptor ring:\n");
 512                 stmmac_display_ring((void *) priv->dma_etx, txsize, 1);
 513         } else {
 514                 pr_info("RX descriptor ring:\n");
 515                 stmmac_display_ring((void *)priv->dma_rx, rxsize, 0);
 516                 pr_info("TX descriptor ring:\n");
 517                 stmmac_display_ring((void *)priv->dma_tx, txsize, 0);
 518         }
 519 }
 520
 521 static int stmmac_set_bfsize(int mtu, int bufsize)
 522 {
 523         int ret = bufsize;
 524
 525         if (mtu >= BUF_SIZE_4KiB)
 526                 ret = BUF_SIZE_8KiB;
 527         else if (mtu >= BUF_SIZE_2KiB)
 528                 ret = BUF_SIZE_4KiB;
 529         else if (mtu >= DMA_BUFFER_SIZE)
 530                 ret = BUF_SIZE_2KiB;
 531         else
 532                 ret = DMA_BUFFER_SIZE;
 533
 534         return ret;
 535 }
 536
 537 static void stmmac_clear_descriptors(struct stmmac_priv *priv)
 538 {
 539         int i;
 540         unsigned int txsize = priv->dma_tx_size;
 541         unsigned int rxsize = priv->dma_rx_size;
 542
 543         /* Clear the Rx/Tx descriptors */
 544         for (i = 0; i < rxsize; i++)
 545                 if (priv->extend_desc)
 546                         priv->hw->desc->init_rx_desc(&priv->dma_erx[i].basic,
 547                                                      priv->use_riwt, priv->mode,
 548                                                      (i == rxsize - 1));
 549                 else
 550                         priv->hw->desc->init_rx_desc(&priv->dma_rx[i],
 551                                                      priv->use_riwt, priv->mode,
 552                                                      (i == rxsize - 1));
 553         for (i = 0; i < txsize; i++)
 554                 if (priv->extend_desc)
 555                         priv->hw->desc->init_tx_desc(&priv->dma_etx[i].basic,
 556                                                      priv->mode,
 557                                                      (i == txsize - 1));
 558                 else
 559                         priv->hw->desc->init_tx_desc(&priv->dma_tx[i],
 560                                                      priv->mode,
 561                                                      (i == txsize - 1));
 562 }
 563
 564 static int stmmac_init_rx_buffers(struct stmmac_priv *priv, struct dma_desc *p,
 565                                   int i)
 566 {
 567         struct sk_buff *skb;
 568
 569         skb = __netdev_alloc_skb(priv->dev, priv->dma_buf_sz + NET_IP_ALIGN,
 570                                  GFP_KERNEL);
 571         if (unlikely(skb == NULL)) {
 572                 pr_err("%s: Rx init fails; skb is NULL\n", __func__);
 573                 return 1;
 574         }
 575         skb_reserve(skb, NET_IP_ALIGN);
 576         priv->rx_skbuff[i] = skb;
 577         priv->rx_skbuff_dma[i] = dma_map_single(priv->device, skb->data,
 578                                                 priv->dma_buf_sz,
 579                                                 DMA_FROM_DEVICE);
 580
 581         p->des2 = priv->rx_skbuff_dma[i];
 582
 583         if ((priv->mode == STMMAC_RING_MODE) &&
 584             (priv->dma_buf_sz == BUF_SIZE_16KiB))
 585                 priv->hw->ring->init_desc3(p);
 586
 587         return 0;
 588 }
 589
 590 /**
 591  * init_dma_desc_rings - init the RX/TX descriptor rings
 592  * @dev: net device structure
 593  * Description:  this function initializes the DMA RX/TX descriptors
 594  * and allocates the socket buffers. It suppors the chained and ring
 595  * modes.
 596  */
 597 static void init_dma_desc_rings(struct net_device *dev)
 598 {
 599         int i;
 600         struct stmmac_priv *priv = netdev_priv(dev);
 601         unsigned int txsize = priv->dma_tx_size;
 602         unsigned int rxsize = priv->dma_rx_size;
 603         unsigned int bfsize = 0;
 604
 605         /* Set the max buffer size according to the DESC mode
 606          * and the MTU. Note that RING mode allows 16KiB bsize. */
 607         if (priv->mode == STMMAC_RING_MODE)
 608                 bfsize = priv->hw->ring->set_16kib_bfsize(dev->mtu);
 609
 610         if (bfsize < BUF_SIZE_16KiB)
 611                 bfsize = stmmac_set_bfsize(dev->mtu, priv->dma_buf_sz);
 612
 613         DBG(probe, INFO, "stmmac: txsize %d, rxsize %d, bfsize %d\n",
 614             txsize, rxsize, bfsize);
 615
 616         if (priv->extend_desc) {
 617                 priv->dma_erx = dma_alloc_coherent(priv->device, rxsize *
 618                                                    sizeof(struct
 619                                                           dma_extended_desc),
 620                                                    &priv->dma_rx_phy,
 621                                                    GFP_KERNEL);
 622                 priv->dma_etx = dma_alloc_coherent(priv->device, txsize *
 623                                                    sizeof(struct
 624                                                           dma_extended_desc),
 625                                                    &priv->dma_tx_phy,
 626                                                    GFP_KERNEL);
 627                 if ((!priv->dma_erx) || (!priv->dma_etx))
 628                         return;
 629         } else {
 630                 priv->dma_rx = dma_alloc_coherent(priv->device, rxsize *
 631                                                   sizeof(struct dma_desc),
 632                                                   &priv->dma_rx_phy,
 633                                                   GFP_KERNEL);
 634                 priv->dma_tx = dma_alloc_coherent(priv->device, txsize *
 635                                                   sizeof(struct dma_desc),
 636                                                   &priv->dma_tx_phy,
 637                                                   GFP_KERNEL);
 638                 if ((!priv->dma_rx) || (!priv->dma_tx))
 639                         return;
 640         }
 641
 642         priv->rx_skbuff_dma = kmalloc_array(rxsize, sizeof(dma_addr_t),
 643                                             GFP_KERNEL);
 644         priv->rx_skbuff = kmalloc_array(rxsize, sizeof(struct sk_buff *),
 645                                         GFP_KERNEL);
 646         priv->tx_skbuff = kmalloc_array(txsize, sizeof(struct sk_buff *),
 647                                         GFP_KERNEL);
 648         if (netif_msg_drv(priv))
 649                 pr_debug("(%s) dma_rx_phy=0x%08x dma_tx_phy=0x%08x\n", __func__,
 650                          (u32) priv->dma_rx_phy, (u32) priv->dma_tx_phy);
 651
 652         /* RX INITIALIZATION */
 653         DBG(probe, INFO, "stmmac: SKB addresses:\nskb\t\tskb data\tdma data\n");
 654         for (i = 0; i < rxsize; i++) {
 655                 struct dma_desc *p;
 656                 if (priv->extend_desc)
 657                         p = &((priv->dma_erx + i)->basic);
 658                 else
 659                         p = priv->dma_rx + i;
 660
 661                 if (stmmac_init_rx_buffers(priv, p, i))
 662                         break;
 663
 664                 DBG(probe, INFO, "[%p]\t[%p]\t[%x]\n", priv->rx_skbuff[i],
 665                         priv->rx_skbuff[i]->data, priv->rx_skbuff_dma[i]);
 666         }
 667         priv->cur_rx = 0;
 668         priv->dirty_rx = (unsigned int)(i - rxsize);
 669         priv->dma_buf_sz = bfsize;
 670         buf_sz = bfsize;
 671
 672         /* Setup the chained descriptor addresses */
 673         if (priv->mode == STMMAC_CHAIN_MODE) {
 674                 if (priv->extend_desc) {
 675                         priv->hw->chain->init(priv->dma_erx, priv->dma_rx_phy,
 676                                               rxsize, 1);
 677                         priv->hw->chain->init(priv->dma_etx, priv->dma_tx_phy,
 678                                               txsize, 1);
 679                 } else {
 680                         priv->hw->chain->init(priv->dma_rx, priv->dma_rx_phy,
 681                                               rxsize, 0);
 682                         priv->hw->chain->init(priv->dma_tx, priv->dma_tx_phy,
 683                                               txsize, 0);
 684                 }
 685         }
 686
 687         /* TX INITIALIZATION */
 688         for (i = 0; i < txsize; i++) {
 689                 struct dma_desc *p;
 690                 if (priv->extend_desc)
 691                         p = &((priv->dma_etx + i)->basic);
 692                 else
 693                         p = priv->dma_tx + i;
 694                 p->des2 = 0;
 695                 priv->tx_skbuff[i] = NULL;
 696         }
 697
 698         priv->dirty_tx = 0;
 699         priv->cur_tx = 0;
 700
 701         stmmac_clear_descriptors(priv);
 702
 703         if (netif_msg_hw(priv))
 704                 stmmac_display_rings(priv);
 705 }
 706
 707 static void dma_free_rx_skbufs(struct stmmac_priv *priv)
 708 {
 709         int i;
 710
 711         for (i = 0; i < priv->dma_rx_size; i++) {
 712                 if (priv->rx_skbuff[i]) {
 713                         dma_unmap_single(priv->device, priv->rx_skbuff_dma[i],
 714                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
 715                         dev_kfree_skb_any(priv->rx_skbuff[i]);
 716                 }
 717                 priv->rx_skbuff[i] = NULL;
 718         }
 719 }
 720
 721 static void dma_free_tx_skbufs(struct stmmac_priv *priv)
 722 {
 723         int i;
 724
 725         for (i = 0; i < priv->dma_tx_size; i++) {
 726                 if (priv->tx_skbuff[i] != NULL) {
 727                         struct dma_desc *p;
 728                         if (priv->extend_desc)
 729                                 p = &((priv->dma_etx + i)->basic);
 730                         else
 731                                 p = priv->dma_tx + i;
 732
 733                         if (p->des2)
 734                                 dma_unmap_single(priv->device, p->des2,
 735                                                  priv->hw->desc->get_tx_len(p),
 736                                                  DMA_TO_DEVICE);
 737                         dev_kfree_skb_any(priv->tx_skbuff[i]);
 738                         priv->tx_skbuff[i] = NULL;
 739                 }
 740         }
 741 }
 742
 743 static void free_dma_desc_resources(struct stmmac_priv *priv)
 744 {
 745         /* Release the DMA TX/RX socket buffers */
 746         dma_free_rx_skbufs(priv);
 747         dma_free_tx_skbufs(priv);
 748
 749         /* Free the region of consistent memory previously allocated for
 750          * the DMA */
 751         if (!priv->extend_desc) {
 752                 dma_free_coherent(priv->device,
 753                                   priv->dma_tx_size * sizeof(struct dma_desc),
 754                                   priv->dma_tx, priv->dma_tx_phy);
 755                 dma_free_coherent(priv->device,
 756                                   priv->dma_rx_size * sizeof(struct dma_desc),
 757                                   priv->dma_rx, priv->dma_rx_phy);
 758         } else {
 759                 dma_free_coherent(priv->device, priv->dma_tx_size *
 760                                   sizeof(struct dma_extended_desc),
 761                                   priv->dma_etx, priv->dma_tx_phy);
 762                 dma_free_coherent(priv->device, priv->dma_rx_size *
 763                                   sizeof(struct dma_extended_desc),
 764                                   priv->dma_erx, priv->dma_rx_phy);
 765         }
 766         kfree(priv->rx_skbuff_dma);
 767         kfree(priv->rx_skbuff);
 768         kfree(priv->tx_skbuff);
 769 }
 770
 771 /**
 772  *  stmmac_dma_operation_mode - HW DMA operation mode
 773  *  @priv : pointer to the private device structure.
 774  *  Description: it sets the DMA operation mode: tx/rx DMA thresholds
 775  *  or Store-And-Forward capability.
 776  */
 777 static void stmmac_dma_operation_mode(struct stmmac_priv *priv)
 778 {
 779         if (likely(priv->plat->force_sf_dma_mode ||
 780                 ((priv->plat->tx_coe) && (!priv->no_csum_insertion)))) {
 781                 /*
 782                  * In case of GMAC, SF mode can be enabled
 783                  * to perform the TX COE in HW. This depends on:
 784                  * 1) TX COE if actually supported
 785                  * 2) There is no bugged Jumbo frame support
 786                  *    that needs to not insert csum in the TDES.
 787                  */
 788                 priv->hw->dma->dma_mode(priv->ioaddr,
 789                                         SF_DMA_MODE, SF_DMA_MODE);
 790                 tc = SF_DMA_MODE;
 791         } else
 792                 priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 793 }
 794
 795 /**
 796  * stmmac_tx_clean:
 797  * @priv: private data pointer
 798  * Description: it reclaims resources after transmission completes.
 799  */
 800 static void stmmac_tx_clean(struct stmmac_priv *priv)
 801 {
 802         unsigned int txsize = priv->dma_tx_size;
 803
 804         spin_lock(&priv->tx_lock);
 805
 806         priv->xstats.tx_clean++;
 807
 808         while (priv->dirty_tx != priv->cur_tx) {
 809                 int last;
 810                 unsigned int entry = priv->dirty_tx % txsize;
 811                 struct sk_buff *skb = priv->tx_skbuff[entry];
 812                 struct dma_desc *p;
 813
 814                 if (priv->extend_desc)
 815                         p = (struct dma_desc *) (priv->dma_etx + entry);
 816                 else
 817                         p = priv->dma_tx + entry;
 818
 819                 /* Check if the descriptor is owned by the DMA. */
 820                 if (priv->hw->desc->get_tx_owner(p))
 821                         break;
 822
 823                 /* Verify tx error by looking at the last segment. */
 824                 last = priv->hw->desc->get_tx_ls(p);
 825                 if (likely(last)) {
 826                         int tx_error =
 827                                 priv->hw->desc->tx_status(&priv->dev->stats,
 828                                                           &priv->xstats, p,
 829                                                           priv->ioaddr);
 830                         if (likely(tx_error == 0)) {
 831                                 priv->dev->stats.tx_packets++;
 832                                 priv->xstats.tx_pkt_n++;
 833                         } else
 834                                 priv->dev->stats.tx_errors++;
 835                 }
 836                 TX_DBG("%s: curr %d, dirty %d\n", __func__,
 837                         priv->cur_tx, priv->dirty_tx);
 838
 839                 if (likely(p->des2))
 840                         dma_unmap_single(priv->device, p->des2,
 841                                          priv->hw->desc->get_tx_len(p),
 842                                          DMA_TO_DEVICE);
 843                 if (priv->mode == STMMAC_RING_MODE)
 844                         priv->hw->ring->clean_desc3(p);
 845
 846                 if (likely(skb != NULL)) {
 847                         dev_kfree_skb(skb);
 848                         priv->tx_skbuff[entry] = NULL;
 849                 }
 850
 851                 priv->hw->desc->release_tx_desc(p, priv->mode);
 852
 853                 priv->dirty_tx++;
 854         }
 855         if (unlikely(netif_queue_stopped(priv->dev) &&
 856                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv))) {
 857                 netif_tx_lock(priv->dev);
 858                 if (netif_queue_stopped(priv->dev) &&
 859                      stmmac_tx_avail(priv) > STMMAC_TX_THRESH(priv)) {
 860                         TX_DBG("%s: restart transmit\n", __func__);
 861                         netif_wake_queue(priv->dev);
 862                 }
 863                 netif_tx_unlock(priv->dev);
 864         }
 865
 866         if ((priv->eee_enabled) && (!priv->tx_path_in_lpi_mode)) {
 867                 stmmac_enable_eee_mode(priv);
 868                 mod_timer(&priv->eee_ctrl_timer, STMMAC_LPI_TIMER(eee_timer));
 869         }
 870         spin_unlock(&priv->tx_lock);
 871 }
 872
 873 static inline void stmmac_enable_dma_irq(struct stmmac_priv *priv)
 874 {
 875         priv->hw->dma->enable_dma_irq(priv->ioaddr);
 876 }
 877
 878 static inline void stmmac_disable_dma_irq(struct stmmac_priv *priv)
 879 {
 880         priv->hw->dma->disable_dma_irq(priv->ioaddr);
 881 }
 882
 883
 884 /**
 885  * stmmac_tx_err:
 886  * @priv: pointer to the private device structure
 887  * Description: it cleans the descriptors and restarts the transmission
 888  * in case of errors.
 889  */
 890 static void stmmac_tx_err(struct stmmac_priv *priv)
 891 {
 892         int i;
 893         int txsize = priv->dma_tx_size;
 894         netif_stop_queue(priv->dev);
 895
 896         priv->hw->dma->stop_tx(priv->ioaddr);
 897         dma_free_tx_skbufs(priv);
 898         for (i = 0; i < txsize; i++)
 899                 if (priv->extend_desc)
 900                         priv->hw->desc->init_tx_desc(&priv->dma_etx[i].basic,
 901                                                      priv->mode,
 902                                                      (i == txsize - 1));
 903                 else
 904                         priv->hw->desc->init_tx_desc(&priv->dma_tx[i],
 905                                                      priv->mode,
 906                                                      (i == txsize - 1));
 907         priv->dirty_tx = 0;
 908         priv->cur_tx = 0;
 909         priv->hw->dma->start_tx(priv->ioaddr);
 910
 911         priv->dev->stats.tx_errors++;
 912         netif_wake_queue(priv->dev);
 913 }
 914
 915 static void stmmac_dma_interrupt(struct stmmac_priv *priv)
 916 {
 917         int status;
 918
 919         status = priv->hw->dma->dma_interrupt(priv->ioaddr, &priv->xstats);
 920         if (likely((status & handle_rx)) || (status & handle_tx)) {
 921                 if (likely(napi_schedule_prep(&priv->napi))) {
 922                         stmmac_disable_dma_irq(priv);
 923                         __napi_schedule(&priv->napi);
 924                 }
 925         }
 926         if (unlikely(status & tx_hard_error_bump_tc)) {
 927                 /* Try to bump up the dma threshold on this failure */
 928                 if (unlikely(tc != SF_DMA_MODE) && (tc <= 256)) {
 929                         tc += 64;
 930                         priv->hw->dma->dma_mode(priv->ioaddr, tc, SF_DMA_MODE);
 931                         priv->xstats.threshold = tc;
 932                 }
 933         } else if (unlikely(status == tx_hard_error))
 934                 stmmac_tx_err(priv);
 935 }
 936
 937 static void stmmac_mmc_setup(struct stmmac_priv *priv)
 938 {
 939         unsigned int mode = MMC_CNTRL_RESET_ON_READ | MMC_CNTRL_COUNTER_RESET |
 940                             MMC_CNTRL_PRESET | MMC_CNTRL_FULL_HALF_PRESET;
 941
 942         /* Mask MMC irq, counters are managed in SW and registers
 943          * are cleared on each READ eventually. */
 944         dwmac_mmc_intr_all_mask(priv->ioaddr);
 945
 946         if (priv->dma_cap.rmon) {
 947                 dwmac_mmc_ctrl(priv->ioaddr, mode);
 948                 memset(&priv->mmc, 0, sizeof(struct stmmac_counters));
 949         } else
 950                 pr_info(" No MAC Management Counters available\n");
 951 }
 952
 953 static u32 stmmac_get_synopsys_id(struct stmmac_priv *priv)
 954 {
 955         u32 hwid = priv->hw->synopsys_uid;
 956
 957         /* Only check valid Synopsys Id because old MAC chips
 958          * have no HW registers where get the ID */
 959         if (likely(hwid)) {
 960                 u32 uid = ((hwid & 0x0000ff00) >> 8);
 961                 u32 synid = (hwid & 0x000000ff);
 962
 963                 pr_info("stmmac - user ID: 0x%x, Synopsys ID: 0x%x\n",
 964                         uid, synid);
 965
 966                 return synid;
 967         }
 968         return 0;
 969 }
 970
 971 /**
 972  * stmmac_selec_desc_mode
 973  * @priv : private structure
 974  * Description: select the Enhanced/Alternate or Normal descriptors
 975  */
 976 static void stmmac_selec_desc_mode(struct stmmac_priv *priv)
 977 {
 978         if (priv->plat->enh_desc) {
 979                 pr_info(" Enhanced/Alternate descriptors\n");
 980
 981                 /* GMAC older than 3.50 has no extended descriptors */
 982                 if (priv->synopsys_id >= DWMAC_CORE_3_50) {
 983                         pr_info("\tEnabled extended descriptors\n");
 984                         priv->extend_desc = 1;
 985                 } else
 986                         pr_warn("Extended descriptors not supported\n");
 987
 988                 priv->hw->desc = &enh_desc_ops;
 989         } else {
 990                 pr_info(" Normal descriptors\n");
 991                 priv->hw->desc = &ndesc_ops;
 992         }
 993 }
 994
 995 /**
 996  * stmmac_get_hw_features
 997  * @priv : private device pointer
 998  * Description:
 999  *  new GMAC chip generations have a new register to indicate the
1000  *  presence of the optional feature/functions.
1001  *  This can be also used to override the value passed through the
1002  *  platform and necessary for old MAC10/100 and GMAC chips.
1003  */
1004 static int stmmac_get_hw_features(struct stmmac_priv *priv)
1005 {
1006         u32 hw_cap = 0;
1007
1008         if (priv->hw->dma->get_hw_feature) {
1009                 hw_cap = priv->hw->dma->get_hw_feature(priv->ioaddr);
1010
1011                 priv->dma_cap.mbps_10_100 = (hw_cap & DMA_HW_FEAT_MIISEL);
1012                 priv->dma_cap.mbps_1000 = (hw_cap & DMA_HW_FEAT_GMIISEL) >> 1;
1013                 priv->dma_cap.half_duplex = (hw_cap & DMA_HW_FEAT_HDSEL) >> 2;
1014                 priv->dma_cap.hash_filter = (hw_cap & DMA_HW_FEAT_HASHSEL) >> 4;
1015                 priv->dma_cap.multi_addr =
1016                         (hw_cap & DMA_HW_FEAT_ADDMACADRSEL) >> 5;
1017                 priv->dma_cap.pcs = (hw_cap & DMA_HW_FEAT_PCSSEL) >> 6;
1018                 priv->dma_cap.sma_mdio = (hw_cap & DMA_HW_FEAT_SMASEL) >> 8;
1019                 priv->dma_cap.pmt_remote_wake_up =
1020                         (hw_cap & DMA_HW_FEAT_RWKSEL) >> 9;
1021                 priv->dma_cap.pmt_magic_frame =
1022                         (hw_cap & DMA_HW_FEAT_MGKSEL) >> 10;
1023                 /* MMC */
1024                 priv->dma_cap.rmon = (hw_cap & DMA_HW_FEAT_MMCSEL) >> 11;
1025                 /* IEEE 1588-2002*/
1026                 priv->dma_cap.time_stamp =
1027                         (hw_cap & DMA_HW_FEAT_TSVER1SEL) >> 12;
1028                 /* IEEE 1588-2008*/
1029                 priv->dma_cap.atime_stamp =
1030                         (hw_cap & DMA_HW_FEAT_TSVER2SEL) >> 13;
1031                 /* 802.3az - Energy-Efficient Ethernet (EEE) */
1032                 priv->dma_cap.eee = (hw_cap & DMA_HW_FEAT_EEESEL) >> 14;
1033                 priv->dma_cap.av = (hw_cap & DMA_HW_FEAT_AVSEL) >> 15;
1034                 /* TX and RX csum */
1035                 priv->dma_cap.tx_coe = (hw_cap & DMA_HW_FEAT_TXCOESEL) >> 16;
1036                 priv->dma_cap.rx_coe_type1 =
1037                         (hw_cap & DMA_HW_FEAT_RXTYP1COE) >> 17;
1038                 priv->dma_cap.rx_coe_type2 =
1039                         (hw_cap & DMA_HW_FEAT_RXTYP2COE) >> 18;
1040                 priv->dma_cap.rxfifo_over_2048 =
1041                         (hw_cap & DMA_HW_FEAT_RXFIFOSIZE) >> 19;
1042                 /* TX and RX number of channels */
1043                 priv->dma_cap.number_rx_channel =
1044                         (hw_cap & DMA_HW_FEAT_RXCHCNT) >> 20;
1045                 priv->dma_cap.number_tx_channel =
1046                         (hw_cap & DMA_HW_FEAT_TXCHCNT) >> 22;
1047                 /* Alternate (enhanced) DESC mode*/
1048                 priv->dma_cap.enh_desc =
1049                         (hw_cap & DMA_HW_FEAT_ENHDESSEL) >> 24;
1050         }
1051
1052         return hw_cap;
1053 }
1054
1055 static void stmmac_check_ether_addr(struct stmmac_priv *priv)
1056 {
1057         /* verify if the MAC address is valid, in case of failures it
1058          * generates a random MAC address */
1059         if (!is_valid_ether_addr(priv->dev->dev_addr)) {
1060                 priv->hw->mac->get_umac_addr((void __iomem *)
1061                                              priv->dev->base_addr,
1062                                              priv->dev->dev_addr, 0);
1063                 if  (!is_valid_ether_addr(priv->dev->dev_addr))
1064                         eth_hw_addr_random(priv->dev);
1065         }
1066         pr_warning("%s: device MAC address %pM\n", priv->dev->name,
1067                                                    priv->dev->dev_addr);
1068 }
1069
1070 static int stmmac_init_dma_engine(struct stmmac_priv *priv)
1071 {
1072         int pbl = DEFAULT_DMA_PBL, fixed_burst = 0, burst_len = 0;
1073         int mixed_burst = 0;
1074         int atds = 0;
1075
1076         /* Some DMA parameters can be passed from the platform;
1077          * in case of these are not passed we keep a default
1078          * (good for all the chips) and init the DMA! */
1079         if (priv->plat->dma_cfg) {
1080                 pbl = priv->plat->dma_cfg->pbl;
1081                 fixed_burst = priv->plat->dma_cfg->fixed_burst;
1082                 mixed_burst = priv->plat->dma_cfg->mixed_burst;
1083                 burst_len = priv->plat->dma_cfg->burst_len;
1084         }
1085
1086         if (priv->extend_desc && (priv->mode == STMMAC_RING_MODE))
1087                 atds = 1;
1088
1089         return priv->hw->dma->init(priv->ioaddr, pbl, fixed_burst, mixed_burst,
1090                                    burst_len, priv->dma_tx_phy,
1091                                    priv->dma_rx_phy, atds);
1092 }
1093
1094 /**
1095  * stmmac_tx_timer:
1096  * @data: data pointer
1097  * Description:
1098  * This is the timer handler to directly invoke the stmmac_tx_clean.
1099  */
1100 static void stmmac_tx_timer(unsigned long data)
1101 {
1102         struct stmmac_priv *priv = (struct stmmac_priv *)data;
1103
1104         stmmac_tx_clean(priv);
1105 }
1106
1107 /**
1108  * stmmac_tx_timer:
1109  * @priv: private data structure
1110  * Description:
1111  * This inits the transmit coalesce parameters: i.e. timer rate,
1112  * timer handler and default threshold used for enabling the
1113  * interrupt on completion bit.
1114  */
1115 static void stmmac_init_tx_coalesce(struct stmmac_priv *priv)
1116 {
1117         priv->tx_coal_frames = STMMAC_TX_FRAMES;
1118         priv->tx_coal_timer = STMMAC_COAL_TX_TIMER;
1119         init_timer(&priv->txtimer);
1120         priv->txtimer.expires = STMMAC_COAL_TIMER(priv->tx_coal_timer);
1121         priv->txtimer.data = (unsigned long)priv;
1122         priv->txtimer.function = stmmac_tx_timer;
1123         add_timer(&priv->txtimer);
1124 }
1125
1126 /**
1127  *  stmmac_open - open entry point of the driver
1128  *  @dev : pointer to the device structure.
1129  *  Description:
1130  *  This function is the open entry point of the driver.
1131  *  Return value:
1132  *  0 on success and an appropriate (-)ve integer as defined in errno.h
1133  *  file on failure.
1134  */
1135 static int stmmac_open(struct net_device *dev)
1136 {
1137         struct stmmac_priv *priv = netdev_priv(dev);
1138         int ret;
1139
1140         clk_prepare_enable(priv->stmmac_clk);
1141
1142         stmmac_check_ether_addr(priv);
1143
1144         ret = stmmac_init_phy(dev);
1145         if (unlikely(ret)) {
1146                 pr_err("%s: Cannot attach to PHY (error: %d)\n", __func__, ret);
1147                 goto open_error;
1148         }
1149
1150         /* Create and initialize the TX/RX descriptors chains. */
1151         priv->dma_tx_size = STMMAC_ALIGN(dma_txsize);
1152         priv->dma_rx_size = STMMAC_ALIGN(dma_rxsize);
1153         priv->dma_buf_sz = STMMAC_ALIGN(buf_sz);
1154         init_dma_desc_rings(dev);
1155
1156         /* DMA initialization and SW reset */
1157         ret = stmmac_init_dma_engine(priv);
1158         if (ret < 0) {
1159                 pr_err("%s: DMA initialization failed\n", __func__);
1160                 goto open_error;
1161         }
1162
1163         /* Copy the MAC addr into the HW  */
1164         priv->hw->mac->set_umac_addr(priv->ioaddr, dev->dev_addr, 0);
1165
1166         /* If required, perform hw setup of the bus. */
1167         if (priv->plat->bus_setup)
1168                 priv->plat->bus_setup(priv->ioaddr);
1169
1170         /* Initialize the MAC Core */
1171         priv->hw->mac->core_init(priv->ioaddr);
1172
1173         /* Request the IRQ lines */
1174         ret = request_irq(dev->irq, stmmac_interrupt,
1175                          IRQF_SHARED, dev->name, dev);
1176         if (unlikely(ret < 0)) {
1177                 pr_err("%s: ERROR: allocating the IRQ %d (error: %d)\n",
1178                        __func__, dev->irq, ret);
1179                 goto open_error;
1180         }
1181
1182         /* Request the Wake IRQ in case of another line is used for WoL */
1183         if (priv->wol_irq != dev->irq) {
1184                 ret = request_irq(priv->wol_irq, stmmac_interrupt,
1185                                   IRQF_SHARED, dev->name, dev);
1186                 if (unlikely(ret < 0)) {
1187                         pr_err("%s: ERROR: allocating the ext WoL IRQ %d "
1188                                "(error: %d)\n", __func__, priv->wol_irq, ret);
1189                         goto open_error_wolirq;
1190                 }
1191         }
1192
1193         /* Request the IRQ lines */
1194         if (priv->lpi_irq != -ENXIO) {
1195                 ret = request_irq(priv->lpi_irq, stmmac_interrupt, IRQF_SHARED,
1196                                   dev->name, dev);
1197                 if (unlikely(ret < 0)) {
1198                         pr_err("%s: ERROR: allocating the LPI IRQ %d (%d)\n",
1199                                __func__, priv->lpi_irq, ret);
1200                         goto open_error_lpiirq;
1201                 }
1202         }
1203
1204         /* Enable the MAC Rx/Tx */
1205         stmmac_set_mac(priv->ioaddr, true);
1206
1207         /* Set the HW DMA mode and the COE */
1208         stmmac_dma_operation_mode(priv);
1209
1210         /* Extra statistics */
1211         memset(&priv->xstats, 0, sizeof(struct stmmac_extra_stats));
1212         priv->xstats.threshold = tc;
1213
1214         stmmac_mmc_setup(priv);
1215
1216 #ifdef CONFIG_STMMAC_DEBUG_FS
1217         ret = stmmac_init_fs(dev);
1218         if (ret < 0)
1219                 pr_warning("%s: failed debugFS registration\n", __func__);
1220 #endif
1221         /* Start the ball rolling... */
1222         DBG(probe, DEBUG, "%s: DMA RX/TX processes started...\n", dev->name);
1223         priv->hw->dma->start_tx(priv->ioaddr);
1224         priv->hw->dma->start_rx(priv->ioaddr);
1225
1226         /* Dump DMA/MAC registers */
1227         if (netif_msg_hw(priv)) {
1228                 priv->hw->mac->dump_regs(priv->ioaddr);
1229                 priv->hw->dma->dump_regs(priv->ioaddr);
1230         }
1231
1232         if (priv->phydev)
1233                 phy_start(priv->phydev);
1234
1235         priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS_TIMER;
1236         priv->eee_enabled = stmmac_eee_init(priv);
1237
1238         stmmac_init_tx_coalesce(priv);
1239
1240         if ((priv->use_riwt) && (priv->hw->dma->rx_watchdog)) {
1241                 priv->rx_riwt = MAX_DMA_RIWT;
1242                 priv->hw->dma->rx_watchdog(priv->ioaddr, MAX_DMA_RIWT);
1243         }
1244
1245         napi_enable(&priv->napi);
1246         netif_start_queue(dev);
1247
1248         return 0;
1249
1250 open_error_lpiirq:
1251         if (priv->wol_irq != dev->irq)
1252                 free_irq(priv->wol_irq, dev);
1253
1254 open_error_wolirq:
1255         free_irq(dev->irq, dev);
1256
1257 open_error:
1258         if (priv->phydev)
1259                 phy_disconnect(priv->phydev);
1260
1261         clk_disable_unprepare(priv->stmmac_clk);
1262
1263         return ret;
1264 }
1265
1266 /**
1267  *  stmmac_release - close entry point of the driver
1268  *  @dev : device pointer.
1269  *  Description:
1270  *  This is the stop entry point of the driver.
1271  */
1272 static int stmmac_release(struct net_device *dev)
1273 {
1274         struct stmmac_priv *priv = netdev_priv(dev);
1275
1276         if (priv->eee_enabled)
1277                 del_timer_sync(&priv->eee_ctrl_timer);
1278
1279         /* Stop and disconnect the PHY */
1280         if (priv->phydev) {
1281                 phy_stop(priv->phydev);
1282                 phy_disconnect(priv->phydev);
1283                 priv->phydev = NULL;
1284         }
1285
1286         netif_stop_queue(dev);
1287
1288         napi_disable(&priv->napi);
1289
1290         del_timer_sync(&priv->txtimer);
1291
1292         /* Free the IRQ lines */
1293         free_irq(dev->irq, dev);
1294         if (priv->wol_irq != dev->irq)
1295                 free_irq(priv->wol_irq, dev);
1296         if (priv->lpi_irq != -ENXIO)
1297                 free_irq(priv->lpi_irq, dev);
1298
1299         /* Stop TX/RX DMA and clear the descriptors */
1300         priv->hw->dma->stop_tx(priv->ioaddr);
1301         priv->hw->dma->stop_rx(priv->ioaddr);
1302
1303         /* Release and free the Rx/Tx resources */
1304         free_dma_desc_resources(priv);
1305
1306         /* Disable the MAC Rx/Tx */
1307         stmmac_set_mac(priv->ioaddr, false);
1308
1309         netif_carrier_off(dev);
1310
1311 #ifdef CONFIG_STMMAC_DEBUG_FS
1312         stmmac_exit_fs();
1313 #endif
1314         clk_disable_unprepare(priv->stmmac_clk);
1315
1316         return 0;
1317 }
1318
1319 /**
1320  *  stmmac_xmit:
1321  *  @skb : the socket buffer
1322  *  @dev : device pointer
1323  *  Description : Tx entry point of the driver.
1324  */
1325 static netdev_tx_t stmmac_xmit(struct sk_buff *skb, struct net_device *dev)
1326 {
1327         struct stmmac_priv *priv = netdev_priv(dev);
1328         unsigned int txsize = priv->dma_tx_size;
1329         unsigned int entry;
1330         int i, csum_insertion = 0, is_jumbo = 0;
1331         int nfrags = skb_shinfo(skb)->nr_frags;
1332         struct dma_desc *desc, *first;
1333         unsigned int nopaged_len = skb_headlen(skb);
1334
1335         if (unlikely(stmmac_tx_avail(priv) < nfrags + 1)) {
1336                 if (!netif_queue_stopped(dev)) {
1337                         netif_stop_queue(dev);
1338                         /* This is a hard error, log it. */
1339                         pr_err("%s: BUG! Tx Ring full when queue awake\n",
1340                                 __func__);
1341                 }
1342                 return NETDEV_TX_BUSY;
1343         }
1344
1345         spin_lock(&priv->tx_lock);
1346
1347         if (priv->tx_path_in_lpi_mode)
1348                 stmmac_disable_eee_mode(priv);
1349
1350         entry = priv->cur_tx % txsize;
1351
1352 #ifdef STMMAC_XMIT_DEBUG
1353         if ((skb->len > ETH_FRAME_LEN) || nfrags)
1354                 pr_debug("stmmac xmit: [entry %d]\n"
1355                          "\tskb addr %p - len: %d - nopaged_len: %d\n"
1356                          "\tn_frags: %d - ip_summed: %d - %s gso\n"
1357                          "\ttx_count_frames %d\n", entry,
1358                          skb, skb->len, nopaged_len, nfrags, skb->ip_summed,
1359                          !skb_is_gso(skb) ? "isn't" : "is",
1360                          priv->tx_count_frames);
1361 #endif
1362
1363         csum_insertion = (skb->ip_summed == CHECKSUM_PARTIAL);
1364
1365         if (priv->extend_desc)
1366                 desc = (struct dma_desc *) (priv->dma_etx + entry);
1367         else
1368                 desc = priv->dma_tx + entry;
1369
1370         first = desc;
1371
1372 #ifdef STMMAC_XMIT_DEBUG
1373         if ((nfrags > 0) || (skb->len > ETH_FRAME_LEN))
1374                 pr_debug("\tskb len: %d, nopaged_len: %d,\n"
1375                          "\t\tn_frags: %d, ip_summed: %d\n",
1376                          skb->len, nopaged_len, nfrags, skb->ip_summed);
1377 #endif
1378         priv->tx_skbuff[entry] = skb;
1379
1380         /* To program the descriptors according to the size of the frame */
1381         if (priv->mode == STMMAC_RING_MODE) {
1382                 is_jumbo = priv->hw->ring->is_jumbo_frm(skb->len,
1383                                                         priv->plat->enh_desc);
1384                 if (unlikely(is_jumbo))
1385                         entry = priv->hw->ring->jumbo_frm(priv, skb,
1386                                                           csum_insertion);
1387         } else {
1388                 is_jumbo = priv->hw->chain->is_jumbo_frm(skb->len,
1389                                                         priv->plat->enh_desc);
1390                 if (unlikely(is_jumbo))
1391                         entry = priv->hw->chain->jumbo_frm(priv, skb,
1392                                                            csum_insertion);
1393         }
1394         if (likely(!is_jumbo)) {
1395                 desc->des2 = dma_map_single(priv->device, skb->data,
1396                                         nopaged_len, DMA_TO_DEVICE);
1397                 priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len,
1398                                                 csum_insertion, priv->mode);
1399         } else
1400                 desc = first;
1401
1402         for (i = 0; i < nfrags; i++) {
1403                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1404                 int len = skb_frag_size(frag);
1405
1406                 entry = (++priv->cur_tx) % txsize;
1407                 if (priv->extend_desc)
1408                         desc = (struct dma_desc *) (priv->dma_etx + entry);
1409                 else
1410                         desc = priv->dma_tx + entry;
1411
1412                 TX_DBG("\t[entry %d] segment len: %d\n", entry, len);
1413                 desc->des2 = skb_frag_dma_map(priv->device, frag, 0, len,
1414                                               DMA_TO_DEVICE);
1415                 priv->tx_skbuff[entry] = NULL;
1416                 priv->hw->desc->prepare_tx_desc(desc, 0, len, csum_insertion,
1417                                                 priv->mode);
1418                 wmb();
1419                 priv->hw->desc->set_tx_owner(desc);
1420                 wmb();
1421         }
1422
1423         /* Finalize the latest segment. */
1424         priv->hw->desc->close_tx_desc(desc);
1425
1426         wmb();
1427         /* According to the coalesce parameter the IC bit for the latest
1428          * segment could be reset and the timer re-started to invoke the
1429          * stmmac_tx function. This approach takes care about the fragments.
1430          */
1431         priv->tx_count_frames += nfrags + 1;
1432         if (priv->tx_coal_frames > priv->tx_count_frames) {
1433                 priv->hw->desc->clear_tx_ic(desc);
1434                 priv->xstats.tx_reset_ic_bit++;
1435                 TX_DBG("\t[entry %d]: tx_count_frames %d\n", entry,
1436                        priv->tx_count_frames);
1437                 mod_timer(&priv->txtimer,
1438                           STMMAC_COAL_TIMER(priv->tx_coal_timer));
1439         } else
1440                 priv->tx_count_frames = 0;
1441
1442         /* To avoid raise condition */
1443         priv->hw->desc->set_tx_owner(first);
1444         wmb();
1445
1446         priv->cur_tx++;
1447
1448 #ifdef STMMAC_XMIT_DEBUG
1449         if (netif_msg_pktdata(priv)) {
1450                 pr_info("stmmac xmit: current=%d, dirty=%d, entry=%d, "
1451                        "first=%p, nfrags=%d\n",
1452                        (priv->cur_tx % txsize), (priv->dirty_tx % txsize),
1453                        entry, first, nfrags);
1454                 if (priv->extend_desc)
1455                         stmmac_display_ring((void *)priv->dma_etx, txsize, 1);
1456                 else
1457                         stmmac_display_ring((void *)priv->dma_tx, txsize, 0);
1458
1459                 pr_info(">>> frame to be transmitted: ");
1460                 print_pkt(skb->data, skb->len);
1461         }
1462 #endif
1463         if (unlikely(stmmac_tx_avail(priv) <= (MAX_SKB_FRAGS + 1))) {
1464                 TX_DBG("%s: stop transmitted packets\n", __func__);
1465                 netif_stop_queue(dev);
1466         }
1467
1468         dev->stats.tx_bytes += skb->len;
1469
1470         skb_tx_timestamp(skb);
1471
1472         priv->hw->dma->enable_dma_transmission(priv->ioaddr);
1473
1474         spin_unlock(&priv->tx_lock);
1475
1476         return NETDEV_TX_OK;
1477 }
1478
1479 static inline void stmmac_rx_refill(struct stmmac_priv *priv)
1480 {
1481         unsigned int rxsize = priv->dma_rx_size;
1482         int bfsize = priv->dma_buf_sz;
1483
1484         for (; priv->cur_rx - priv->dirty_rx > 0; priv->dirty_rx++) {
1485                 unsigned int entry = priv->dirty_rx % rxsize;
1486                 struct dma_desc *p;
1487
1488                 if (priv->extend_desc)
1489                         p = (struct dma_desc *) (priv->dma_erx + entry);
1490                 else
1491                         p = priv->dma_rx + entry;
1492
1493                 if (likely(priv->rx_skbuff[entry] == NULL)) {
1494                         struct sk_buff *skb;
1495
1496                         skb = netdev_alloc_skb_ip_align(priv->dev, bfsize);
1497
1498                         if (unlikely(skb == NULL))
1499                                 break;
1500
1501                         priv->rx_skbuff[entry] = skb;
1502                         priv->rx_skbuff_dma[entry] =
1503                             dma_map_single(priv->device, skb->data, bfsize,
1504                                            DMA_FROM_DEVICE);
1505
1506                         p->des2 = priv->rx_skbuff_dma[entry];
1507
1508                         if (unlikely((priv->mode == STMMAC_RING_MODE) &&
1509                                      (priv->plat->has_gmac)))
1510                                 priv->hw->ring->refill_desc3(bfsize, p);
1511
1512                         RX_DBG(KERN_INFO "\trefill entry #%d\n", entry);
1513                 }
1514                 wmb();
1515                 priv->hw->desc->set_rx_owner(p);
1516                 wmb();
1517         }
1518 }
1519
1520 static int stmmac_rx(struct stmmac_priv *priv, int limit)
1521 {
1522         unsigned int rxsize = priv->dma_rx_size;
1523         unsigned int entry = priv->cur_rx % rxsize;
1524         unsigned int next_entry;
1525         unsigned int count = 0;
1526
1527 #ifdef STMMAC_RX_DEBUG
1528         if (netif_msg_hw(priv)) {
1529                 pr_debug(">>> stmmac_rx: descriptor ring:\n");
1530                 if (priv->extend_desc)
1531                         stmmac_display_ring((void *) priv->dma_erx, rxsize, 1);
1532                 else
1533                         stmmac_display_ring((void *)priv->dma_rx, rxsize, 0);
1534         }
1535 #endif
1536         while (count < limit) {
1537                 int status;
1538                 struct dma_desc *p, *p_next;
1539
1540                 if (priv->extend_desc)
1541                         p = (struct dma_desc *) (priv->dma_erx + entry);
1542                 else
1543                         p = priv->dma_rx + entry ;
1544
1545                 if (priv->hw->desc->get_rx_owner(p))
1546                         break;
1547
1548                 count++;
1549
1550                 next_entry = (++priv->cur_rx) % rxsize;
1551                 if (priv->extend_desc)
1552                         p_next = (struct dma_desc *) (priv->dma_erx +
1553                                                       next_entry);
1554                 else
1555                         p_next = priv->dma_rx + next_entry;
1556
1557                 prefetch(p_next);
1558
1559                 /* read the status of the incoming frame */
1560                 status = priv->hw->desc->rx_status(&priv->dev->stats,
1561                                                    &priv->xstats, p);
1562                 if ((priv->extend_desc) && (priv->hw->desc->rx_extended_status))
1563                         priv->hw->desc->rx_extended_status(&priv->dev->stats,
1564                                                            &priv->xstats,
1565                                                            priv->dma_erx +
1566                                                            entry);
1567                 if (unlikely(status == discard_frame))
1568                         priv->dev->stats.rx_errors++;
1569                 else {
1570                         struct sk_buff *skb;
1571                         int frame_len;
1572
1573                         frame_len = priv->hw->desc->get_rx_frame_len(p,
1574                                         priv->plat->rx_coe);
1575                         /* ACS is set; GMAC core strips PAD/FCS for IEEE 802.3
1576                          * Type frames (LLC/LLC-SNAP) */
1577                         if (unlikely(status != llc_snap))
1578                                 frame_len -= ETH_FCS_LEN;
1579 #ifdef STMMAC_RX_DEBUG
1580                         if (frame_len > ETH_FRAME_LEN)
1581                                 pr_debug("\tRX frame size %d, COE status: %d\n",
1582                                         frame_len, status);
1583
1584                         if (netif_msg_hw(priv))
1585                                 pr_debug("\tdesc: %p [entry %d] buff=0x%x\n",
1586                                         p, entry, p->des2);
1587 #endif
1588                         skb = priv->rx_skbuff[entry];
1589                         if (unlikely(!skb)) {
1590                                 pr_err("%s: Inconsistent Rx descriptor chain\n",
1591                                         priv->dev->name);
1592                                 priv->dev->stats.rx_dropped++;
1593                                 break;
1594                         }
1595                         prefetch(skb->data - NET_IP_ALIGN);
1596                         priv->rx_skbuff[entry] = NULL;
1597
1598                         skb_put(skb, frame_len);
1599                         dma_unmap_single(priv->device,
1600                                          priv->rx_skbuff_dma[entry],
1601                                          priv->dma_buf_sz, DMA_FROM_DEVICE);
1602 #ifdef STMMAC_RX_DEBUG
1603                         if (netif_msg_pktdata(priv)) {
1604                                 pr_info(" frame received (%dbytes)", frame_len);
1605                                 print_pkt(skb->data, frame_len);
1606                         }
1607 #endif
1608                         skb->protocol = eth_type_trans(skb, priv->dev);
1609
1610                         if (unlikely(!priv->plat->rx_coe))
1611                                 skb_checksum_none_assert(skb);
1612                         else
1613                                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1614
1615                         napi_gro_receive(&priv->napi, skb);
1616
1617                         priv->dev->stats.rx_packets++;
1618                         priv->dev->stats.rx_bytes += frame_len;
1619                 }
1620                 entry = next_entry;
1621         }
1622
1623         stmmac_rx_refill(priv);
1624
1625         priv->xstats.rx_pkt_n += count;
1626
1627         return count;
1628 }
1629
1630 /**
1631  *  stmmac_poll - stmmac poll method (NAPI)
1632  *  @napi : pointer to the napi structure.
1633  *  @budget : maximum number of packets that the current CPU can receive from
1634  *            all interfaces.
1635  *  Description :
1636  *  To look at the incoming frames and clear the tx resources.
1637  */
1638 static int stmmac_poll(struct napi_struct *napi, int budget)
1639 {
1640         struct stmmac_priv *priv = container_of(napi, struct stmmac_priv, napi);
1641         int work_done = 0;
1642
1643         priv->xstats.napi_poll++;
1644         stmmac_tx_clean(priv);
1645
1646         work_done = stmmac_rx(priv, budget);
1647         if (work_done < budget) {
1648                 napi_complete(napi);
1649                 stmmac_enable_dma_irq(priv);
1650         }
1651         return work_done;
1652 }
1653
1654 /**
1655  *  stmmac_tx_timeout
1656  *  @dev : Pointer to net device structure
1657  *  Description: this function is called when a packet transmission fails to
1658  *   complete within a reasonable time. The driver will mark the error in the
1659  *   netdev structure and arrange for the device to be reset to a sane state
1660  *   in order to transmit a new packet.
1661  */
1662 static void stmmac_tx_timeout(struct net_device *dev)
1663 {
1664         struct stmmac_priv *priv = netdev_priv(dev);
1665
1666         /* Clear Tx resources and restart transmitting again */
1667         stmmac_tx_err(priv);
1668 }
1669
1670 /* Configuration changes (passed on by ifconfig) */
1671 static int stmmac_config(struct net_device *dev, struct ifmap *map)
1672 {
1673         if (dev->flags & IFF_UP)        /* can't act on a running interface */
1674                 return -EBUSY;
1675
1676         /* Don't allow changing the I/O address */
1677         if (map->base_addr != dev->base_addr) {
1678                 pr_warning("%s: can't change I/O address\n", dev->name);
1679                 return -EOPNOTSUPP;
1680         }
1681
1682         /* Don't allow changing the IRQ */
1683         if (map->irq != dev->irq) {
1684                 pr_warning("%s: can't change IRQ number %d\n",
1685                        dev->name, dev->irq);
1686                 return -EOPNOTSUPP;
1687         }
1688
1689         /* ignore other fields */
1690         return 0;
1691 }
1692
1693 /**
1694  *  stmmac_set_rx_mode - entry point for multicast addressing
1695  *  @dev : pointer to the device structure
1696  *  Description:
1697  *  This function is a driver entry point which gets called by the kernel
1698  *  whenever multicast addresses must be enabled/disabled.
1699  *  Return value:
1700  *  void.
1701  */
1702 static void stmmac_set_rx_mode(struct net_device *dev)
1703 {
1704         struct stmmac_priv *priv = netdev_priv(dev);
1705
1706         spin_lock(&priv->lock);
1707         priv->hw->mac->set_filter(dev, priv->synopsys_id);
1708         spin_unlock(&priv->lock);
1709 }
1710
1711 /**
1712  *  stmmac_change_mtu - entry point to change MTU size for the device.
1713  *  @dev : device pointer.
1714  *  @new_mtu : the new MTU size for the device.
1715  *  Description: the Maximum Transfer Unit (MTU) is used by the network layer
1716  *  to drive packet transmission. Ethernet has an MTU of 1500 octets
1717  *  (ETH_DATA_LEN). This value can be changed with ifconfig.
1718  *  Return value:
1719  *  0 on success and an appropriate (-)ve integer as defined in errno.h
1720  *  file on failure.
1721  */
1722 static int stmmac_change_mtu(struct net_device *dev, int new_mtu)
1723 {
1724         struct stmmac_priv *priv = netdev_priv(dev);
1725         int max_mtu;
1726
1727         if (netif_running(dev)) {
1728                 pr_err("%s: must be stopped to change its MTU\n", dev->name);
1729                 return -EBUSY;
1730         }
1731
1732         if (priv->plat->enh_desc)
1733                 max_mtu = JUMBO_LEN;
1734         else
1735                 max_mtu = SKB_MAX_HEAD(NET_SKB_PAD + NET_IP_ALIGN);
1736
1737         if ((new_mtu < 46) || (new_mtu > max_mtu)) {
1738                 pr_err("%s: invalid MTU, max MTU is: %d\n", dev->name, max_mtu);
1739                 return -EINVAL;
1740         }
1741
1742         dev->mtu = new_mtu;
1743         netdev_update_features(dev);
1744
1745         return 0;
1746 }
1747
1748 static netdev_features_t stmmac_fix_features(struct net_device *dev,
1749         netdev_features_t features)
1750 {
1751         struct stmmac_priv *priv = netdev_priv(dev);
1752
1753         if (priv->plat->rx_coe == STMMAC_RX_COE_NONE)
1754                 features &= ~NETIF_F_RXCSUM;
1755         else if (priv->plat->rx_coe == STMMAC_RX_COE_TYPE1)
1756                 features &= ~NETIF_F_IPV6_CSUM;
1757         if (!priv->plat->tx_coe)
1758                 features &= ~NETIF_F_ALL_CSUM;
1759
1760         /* Some GMAC devices have a bugged Jumbo frame support that
1761          * needs to have the Tx COE disabled for oversized frames
1762          * (due to limited buffer sizes). In this case we disable
1763          * the TX csum insertionin the TDES and not use SF. */
1764         if (priv->plat->bugged_jumbo && (dev->mtu > ETH_DATA_LEN))
1765                 features &= ~NETIF_F_ALL_CSUM;
1766
1767         return features;
1768 }
1769
1770 static irqreturn_t stmmac_interrupt(int irq, void *dev_id)
1771 {
1772         struct net_device *dev = (struct net_device *)dev_id;
1773         struct stmmac_priv *priv = netdev_priv(dev);
1774
1775         if (unlikely(!dev)) {
1776                 pr_err("%s: invalid dev pointer\n", __func__);
1777                 return IRQ_NONE;
1778         }
1779
1780         /* To handle GMAC own interrupts */
1781         if (priv->plat->has_gmac) {
1782                 int status = priv->hw->mac->host_irq_status((void __iomem *)
1783                                                             dev->base_addr,
1784                                                             &priv->xstats);
1785                 if (unlikely(status)) {
1786                         /* For LPI we need to save the tx status */
1787                         if (status & CORE_IRQ_TX_PATH_IN_LPI_MODE)
1788                                 priv->tx_path_in_lpi_mode = true;
1789                         if (status & CORE_IRQ_TX_PATH_EXIT_LPI_MODE)
1790                                 priv->tx_path_in_lpi_mode = false;
1791                 }
1792         }
1793
1794         /* To handle DMA interrupts */
1795         stmmac_dma_interrupt(priv);
1796
1797         return IRQ_HANDLED;
1798 }
1799
1800 #ifdef CONFIG_NET_POLL_CONTROLLER
1801 /* Polling receive - used by NETCONSOLE and other diagnostic tools
1802  * to allow network I/O with interrupts disabled. */
1803 static void stmmac_poll_controller(struct net_device *dev)
1804 {
1805         disable_irq(dev->irq);
1806         stmmac_interrupt(dev->irq, dev);
1807         enable_irq(dev->irq);
1808 }
1809 #endif
1810
1811 /**
1812  *  stmmac_ioctl - Entry point for the Ioctl
1813  *  @dev: Device pointer.
1814  *  @rq: An IOCTL specefic structure, that can contain a pointer to
1815  *  a proprietary structure used to pass information to the driver.
1816  *  @cmd: IOCTL command
1817  *  Description:
1818  *  Currently there are no special functionality supported in IOCTL, just the
1819  *  phy_mii_ioctl(...) can be invoked.
1820  */
1821 static int stmmac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1822 {
1823         struct stmmac_priv *priv = netdev_priv(dev);
1824         int ret;
1825
1826         if (!netif_running(dev))
1827                 return -EINVAL;
1828
1829         if (!priv->phydev)
1830                 return -EINVAL;
1831
1832         ret = phy_mii_ioctl(priv->phydev, rq, cmd);
1833
1834         return ret;
1835 }
1836
1837 #ifdef CONFIG_STMMAC_DEBUG_FS
1838 static struct dentry *stmmac_fs_dir;
1839 static struct dentry *stmmac_rings_status;
1840 static struct dentry *stmmac_dma_cap;
1841
1842 static void sysfs_display_ring(void *head, int size, int extend_desc,
1843                                 struct seq_file *seq)
1844 {
1845         int i;
1846         struct dma_extended_desc *ep = (struct dma_extended_desc *) head;
1847         struct dma_desc *p = (struct dma_desc *) head;
1848
1849         for (i = 0; i < size; i++) {
1850                 u64 x;
1851                 if (extend_desc) {
1852                         x = *(u64 *) ep;
1853                         seq_printf(seq, "%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
1854                                    i, (unsigned int) virt_to_phys(ep),
1855                                    (unsigned int) x, (unsigned int) (x >> 32),
1856                                    ep->basic.des2, ep->basic.des3);
1857                         ep++;
1858                 } else {
1859                         x = *(u64 *) p;
1860                         seq_printf(seq, "%d [0x%x]: 0x%x 0x%x 0x%x 0x%x\n",
1861                                    i, (unsigned int) virt_to_phys(ep),
1862                                    (unsigned int) x, (unsigned int) (x >> 32),
1863                                    p->des2, p->des3);
1864                         p++;
1865                 }
1866                 seq_printf(seq, "\n");
1867         }
1868 }
1869
1870 static int stmmac_sysfs_ring_read(struct seq_file *seq, void *v)
1871 {
1872         struct net_device *dev = seq->private;
1873         struct stmmac_priv *priv = netdev_priv(dev);
1874         unsigned int txsize = priv->dma_tx_size;
1875         unsigned int rxsize = priv->dma_rx_size;
1876
1877         if (priv->extend_desc) {
1878                 seq_printf(seq, "Extended RX descriptor ring:\n");
1879                 sysfs_display_ring((void *) priv->dma_erx, rxsize, 1, seq);
1880                 seq_printf(seq, "Extended TX descriptor ring:\n");
1881                 sysfs_display_ring((void *) priv->dma_etx, txsize, 1, seq);
1882         } else {
1883                 seq_printf(seq, "RX descriptor ring:\n");
1884                 sysfs_display_ring((void *)priv->dma_rx, rxsize, 0, seq);
1885                 seq_printf(seq, "TX descriptor ring:\n");
1886                 sysfs_display_ring((void *)priv->dma_tx, txsize, 0, seq);
1887         }
1888
1889         return 0;
1890 }
1891
1892 static int stmmac_sysfs_ring_open(struct inode *inode, struct file *file)
1893 {
1894         return single_open(file, stmmac_sysfs_ring_read, inode->i_private);
1895 }
1896
1897 static const struct file_operations stmmac_rings_status_fops = {
1898         .owner = THIS_MODULE,
1899         .open = stmmac_sysfs_ring_open,
1900         .read = seq_read,
1901         .llseek = seq_lseek,
1902         .release = single_release,
1903 };
1904
1905 static int stmmac_sysfs_dma_cap_read(struct seq_file *seq, void *v)
1906 {
1907         struct net_device *dev = seq->private;
1908         struct stmmac_priv *priv = netdev_priv(dev);
1909
1910         if (!priv->hw_cap_support) {
1911                 seq_printf(seq, "DMA HW features not supported\n");
1912                 return 0;
1913         }
1914
1915         seq_printf(seq, "==============================\n");
1916         seq_printf(seq, "\tDMA HW features\n");
1917         seq_printf(seq, "==============================\n");
1918
1919         seq_printf(seq, "\t10/100 Mbps %s\n",
1920                    (priv->dma_cap.mbps_10_100) ? "Y" : "N");
1921         seq_printf(seq, "\t1000 Mbps %s\n",
1922                    (priv->dma_cap.mbps_1000) ? "Y" : "N");
1923         seq_printf(seq, "\tHalf duple %s\n",
1924                    (priv->dma_cap.half_duplex) ? "Y" : "N");
1925         seq_printf(seq, "\tHash Filter: %s\n",
1926                    (priv->dma_cap.hash_filter) ? "Y" : "N");
1927         seq_printf(seq, "\tMultiple MAC address registers: %s\n",
1928                    (priv->dma_cap.multi_addr) ? "Y" : "N");
1929         seq_printf(seq, "\tPCS (TBI/SGMII/RTBI PHY interfatces): %s\n",
1930                    (priv->dma_cap.pcs) ? "Y" : "N");
1931         seq_printf(seq, "\tSMA (MDIO) Interface: %s\n",
1932                    (priv->dma_cap.sma_mdio) ? "Y" : "N");
1933         seq_printf(seq, "\tPMT Remote wake up: %s\n",
1934                    (priv->dma_cap.pmt_remote_wake_up) ? "Y" : "N");
1935         seq_printf(seq, "\tPMT Magic Frame: %s\n",
1936                    (priv->dma_cap.pmt_magic_frame) ? "Y" : "N");
1937         seq_printf(seq, "\tRMON module: %s\n",
1938                    (priv->dma_cap.rmon) ? "Y" : "N");
1939         seq_printf(seq, "\tIEEE 1588-2002 Time Stamp: %s\n",
1940                    (priv->dma_cap.time_stamp) ? "Y" : "N");
1941         seq_printf(seq, "\tIEEE 1588-2008 Advanced Time Stamp:%s\n",
1942                    (priv->dma_cap.atime_stamp) ? "Y" : "N");
1943         seq_printf(seq, "\t802.3az - Energy-Efficient Ethernet (EEE) %s\n",
1944                    (priv->dma_cap.eee) ? "Y" : "N");
1945         seq_printf(seq, "\tAV features: %s\n", (priv->dma_cap.av) ? "Y" : "N");
1946         seq_printf(seq, "\tChecksum Offload in TX: %s\n",
1947                    (priv->dma_cap.tx_coe) ? "Y" : "N");
1948         seq_printf(seq, "\tIP Checksum Offload (type1) in RX: %s\n",
1949                    (priv->dma_cap.rx_coe_type1) ? "Y" : "N");
1950         seq_printf(seq, "\tIP Checksum Offload (type2) in RX: %s\n",
1951                    (priv->dma_cap.rx_coe_type2) ? "Y" : "N");
1952         seq_printf(seq, "\tRXFIFO > 2048bytes: %s\n",
1953                    (priv->dma_cap.rxfifo_over_2048) ? "Y" : "N");
1954         seq_printf(seq, "\tNumber of Additional RX channel: %d\n",
1955                    priv->dma_cap.number_rx_channel);
1956         seq_printf(seq, "\tNumber of Additional TX channel: %d\n",
1957                    priv->dma_cap.number_tx_channel);
1958         seq_printf(seq, "\tEnhanced descriptors: %s\n",
1959                    (priv->dma_cap.enh_desc) ? "Y" : "N");
1960
1961         return 0;
1962 }
1963
1964 static int stmmac_sysfs_dma_cap_open(struct inode *inode, struct file *file)
1965 {
1966         return single_open(file, stmmac_sysfs_dma_cap_read, inode->i_private);
1967 }
1968
1969 static const struct file_operations stmmac_dma_cap_fops = {
1970         .owner = THIS_MODULE,
1971         .open = stmmac_sysfs_dma_cap_open,
1972         .read = seq_read,
1973         .llseek = seq_lseek,
1974         .release = single_release,
1975 };
1976
1977 static int stmmac_init_fs(struct net_device *dev)
1978 {
1979         /* Create debugfs entries */
1980         stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);
1981
1982         if (!stmmac_fs_dir || IS_ERR(stmmac_fs_dir)) {
1983                 pr_err("ERROR %s, debugfs create directory failed\n",
1984                        STMMAC_RESOURCE_NAME);
1985
1986                 return -ENOMEM;
1987         }
1988
1989         /* Entry to report DMA RX/TX rings */
1990         stmmac_rings_status = debugfs_create_file("descriptors_status",
1991                                            S_IRUGO, stmmac_fs_dir, dev,
1992                                            &stmmac_rings_status_fops);
1993
1994         if (!stmmac_rings_status || IS_ERR(stmmac_rings_status)) {
1995                 pr_info("ERROR creating stmmac ring debugfs file\n");
1996                 debugfs_remove(stmmac_fs_dir);
1997
1998                 return -ENOMEM;
1999         }
2000
2001         /* Entry to report the DMA HW features */
2002         stmmac_dma_cap = debugfs_create_file("dma_cap", S_IRUGO, stmmac_fs_dir,
2003                                              dev, &stmmac_dma_cap_fops);
2004
2005         if (!stmmac_dma_cap || IS_ERR(stmmac_dma_cap)) {
2006                 pr_info("ERROR creating stmmac MMC debugfs file\n");
2007                 debugfs_remove(stmmac_rings_status);
2008                 debugfs_remove(stmmac_fs_dir);
2009
2010                 return -ENOMEM;
2011         }
2012
2013         return 0;
2014 }
2015
2016 static void stmmac_exit_fs(void)
2017 {
2018         debugfs_remove(stmmac_rings_status);
2019         debugfs_remove(stmmac_dma_cap);
2020         debugfs_remove(stmmac_fs_dir);
2021 }
2022 #endif /* CONFIG_STMMAC_DEBUG_FS */
2023
2024 static const struct net_device_ops stmmac_netdev_ops = {
2025         .ndo_open = stmmac_open,
2026         .ndo_start_xmit = stmmac_xmit,
2027         .ndo_stop = stmmac_release,
2028         .ndo_change_mtu = stmmac_change_mtu,
2029         .ndo_fix_features = stmmac_fix_features,
2030         .ndo_set_rx_mode = stmmac_set_rx_mode,
2031         .ndo_tx_timeout = stmmac_tx_timeout,
2032         .ndo_do_ioctl = stmmac_ioctl,
2033         .ndo_set_config = stmmac_config,
2034 #ifdef CONFIG_NET_POLL_CONTROLLER
2035         .ndo_poll_controller = stmmac_poll_controller,
2036 #endif
2037         .ndo_set_mac_address = eth_mac_addr,
2038 };
2039
2040 /**
2041  *  stmmac_hw_init - Init the MAC device
2042  *  @priv : pointer to the private device structure.
2043  *  Description: this function detects which MAC device
2044  *  (GMAC/MAC10-100) has to attached, checks the HW capability
2045  *  (if supported) and sets the driver's features (for example
2046  *  to use the ring or chaine mode or support the normal/enh
2047  *  descriptor structure).
2048  */
2049 static int stmmac_hw_init(struct stmmac_priv *priv)
2050 {
2051         int ret;
2052         struct mac_device_info *mac;
2053
2054         /* Identify the MAC HW device */
2055         if (priv->plat->has_gmac) {
2056                 priv->dev->priv_flags |= IFF_UNICAST_FLT;
2057                 mac = dwmac1000_setup(priv->ioaddr);
2058         } else {
2059                 mac = dwmac100_setup(priv->ioaddr);
2060         }
2061         if (!mac)
2062                 return -ENOMEM;
2063
2064         priv->hw = mac;
2065
2066         /* Get and dump the chip ID */
2067         priv->synopsys_id = stmmac_get_synopsys_id(priv);
2068
2069         /* To use alternate (extended) or normal descriptor structures */
2070         stmmac_selec_desc_mode(priv);
2071
2072         /* To use the chained or ring mode */
2073         if (chain_mode) {
2074                 priv->hw->chain = &chain_mode_ops;
2075                 pr_info(" Chain mode enabled\n");
2076                 priv->mode = STMMAC_CHAIN_MODE;
2077         } else {
2078                 priv->hw->ring = &ring_mode_ops;
2079                 pr_info(" Ring mode enabled\n");
2080                 priv->mode = STMMAC_RING_MODE;
2081         }
2082
2083         /* Get the HW capability (new GMAC newer than 3.50a) */
2084         priv->hw_cap_support = stmmac_get_hw_features(priv);
2085         if (priv->hw_cap_support) {
2086                 pr_info(" DMA HW capability register supported");
2087
2088                 /* We can override some gmac/dma configuration fields: e.g.
2089                  * enh_desc, tx_coe (e.g. that are passed through the
2090                  * platform) with the values from the HW capability
2091                  * register (if supported).
2092                  */
2093                 priv->plat->enh_desc = priv->dma_cap.enh_desc;
2094                 priv->plat->pmt = priv->dma_cap.pmt_remote_wake_up;
2095
2096                 priv->plat->tx_coe = priv->dma_cap.tx_coe;
2097
2098                 if (priv->dma_cap.rx_coe_type2)
2099                         priv->plat->rx_coe = STMMAC_RX_COE_TYPE2;
2100                 else if (priv->dma_cap.rx_coe_type1)
2101                         priv->plat->rx_coe = STMMAC_RX_COE_TYPE1;
2102
2103         } else
2104                 pr_info(" No HW DMA feature register supported");
2105
2106         /* Enable the IPC (Checksum Offload) and check if the feature has been
2107          * enabled during the core configuration. */
2108         ret = priv->hw->mac->rx_ipc(priv->ioaddr);
2109         if (!ret) {
2110                 pr_warning(" RX IPC Checksum Offload not configured.\n");
2111                 priv->plat->rx_coe = STMMAC_RX_COE_NONE;
2112         }
2113
2114         if (priv->plat->rx_coe)
2115                 pr_info(" RX Checksum Offload Engine supported (type %d)\n",
2116                         priv->plat->rx_coe);
2117         if (priv->plat->tx_coe)
2118                 pr_info(" TX Checksum insertion supported\n");
2119
2120         if (priv->plat->pmt) {
2121                 pr_info(" Wake-Up On Lan supported\n");
2122                 device_set_wakeup_capable(priv->device, 1);
2123         }
2124
2125         return 0;
2126 }
2127
2128 /**
2129  * stmmac_dvr_probe
2130  * @device: device pointer
2131  * @plat_dat: platform data pointer
2132  * @addr: iobase memory address
2133  * Description: this is the main probe function used to
2134  * call the alloc_etherdev, allocate the priv structure.
2135  */
2136 struct stmmac_priv *stmmac_dvr_probe(struct device *device,
2137                                      struct plat_stmmacenet_data *plat_dat,
2138                                      void __iomem *addr)
2139 {
2140         int ret = 0;
2141         struct net_device *ndev = NULL;
2142         struct stmmac_priv *priv;
2143
2144         ndev = alloc_etherdev(sizeof(struct stmmac_priv));
2145         if (!ndev)
2146                 return NULL;
2147
2148         SET_NETDEV_DEV(ndev, device);
2149
2150         priv = netdev_priv(ndev);
2151         priv->device = device;
2152         priv->dev = ndev;
2153
2154         ether_setup(ndev);
2155
2156         stmmac_set_ethtool_ops(ndev);
2157         priv->pause = pause;
2158         priv->plat = plat_dat;
2159         priv->ioaddr = addr;
2160         priv->dev->base_addr = (unsigned long)addr;
2161
2162         /* Verify driver arguments */
2163         stmmac_verify_args();
2164
2165         /* Override with kernel parameters if supplied XXX CRS XXX
2166          * this needs to have multiple instances */
2167         if ((phyaddr >= 0) && (phyaddr <= 31))
2168                 priv->plat->phy_addr = phyaddr;
2169
2170         /* Init MAC and get the capabilities */
2171         ret = stmmac_hw_init(priv);
2172         if (ret)
2173                 goto error_free_netdev;
2174
2175         ndev->netdev_ops = &stmmac_netdev_ops;
2176
2177         ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
2178                             NETIF_F_RXCSUM;
2179         ndev->features |= ndev->hw_features | NETIF_F_HIGHDMA;
2180         ndev->watchdog_timeo = msecs_to_jiffies(watchdog);
2181 #ifdef STMMAC_VLAN_TAG_USED
2182         /* Both mac100 and gmac support receive VLAN tag detection */
2183         ndev->features |= NETIF_F_HW_VLAN_RX;
2184 #endif
2185         priv->msg_enable = netif_msg_init(debug, default_msg_level);
2186
2187         if (flow_ctrl)
2188                 priv->flow_ctrl = FLOW_AUTO;    /* RX/TX pause on */
2189
2190         /* Rx Watchdog is available in the COREs newer than the 3.40.
2191          * In some case, for example on bugged HW this feature
2192          * has to be disable and this can be done by passing the
2193          * riwt_off field from the platform.
2194          */
2195         if ((priv->synopsys_id >= DWMAC_CORE_3_50) && (!priv->plat->riwt_off)) {
2196                 priv->use_riwt = 1;
2197                 pr_info(" Enable RX Mitigation via HW Watchdog Timer\n");
2198         }
2199
2200         netif_napi_add(ndev, &priv->napi, stmmac_poll, 64);
2201
2202         spin_lock_init(&priv->lock);
2203         spin_lock_init(&priv->tx_lock);
2204
2205         ret = register_netdev(ndev);
2206         if (ret) {
2207                 pr_err("%s: ERROR %i registering the device\n", __func__, ret);
2208                 goto error_netdev_register;
2209         }
2210
2211         priv->stmmac_clk = clk_get(priv->device, STMMAC_RESOURCE_NAME);
2212         if (IS_ERR(priv->stmmac_clk)) {
2213                 pr_warning("%s: warning: cannot get CSR clock\n", __func__);
2214                 goto error_clk_get;
2215         }
2216
2217         /* If a specific clk_csr value is passed from the platform
2218          * this means that the CSR Clock Range selection cannot be
2219          * changed at run-time and it is fixed. Viceversa the driver'll try to
2220          * set the MDC clock dynamically according to the csr actual
2221          * clock input.
2222          */
2223         if (!priv->plat->clk_csr)
2224                 stmmac_clk_csr_set(priv);
2225         else
2226                 priv->clk_csr = priv->plat->clk_csr;
2227
2228         /* MDIO bus Registration */
2229         ret = stmmac_mdio_register(ndev);
2230         if (ret < 0) {
2231                 pr_debug("%s: MDIO bus (id: %d) registration failed",
2232                          __func__, priv->plat->bus_id);
2233                 goto error_mdio_register;
2234         }
2235
2236         return priv;
2237
2238 error_mdio_register:
2239         clk_put(priv->stmmac_clk);
2240 error_clk_get:
2241         unregister_netdev(ndev);
2242 error_netdev_register:
2243         netif_napi_del(&priv->napi);
2244 error_free_netdev:
2245         free_netdev(ndev);
2246
2247         return NULL;
2248 }
2249
2250 /**
2251  * stmmac_dvr_remove
2252  * @ndev: net device pointer
2253  * Description: this function resets the TX/RX processes, disables the MAC RX/TX
2254  * changes the link status, releases the DMA descriptor rings.
2255  */
2256 int stmmac_dvr_remove(struct net_device *ndev)
2257 {
2258         struct stmmac_priv *priv = netdev_priv(ndev);
2259
2260         pr_info("%s:\n\tremoving driver", __func__);
2261
2262         priv->hw->dma->stop_rx(priv->ioaddr);
2263         priv->hw->dma->stop_tx(priv->ioaddr);
2264
2265         stmmac_set_mac(priv->ioaddr, false);
2266         stmmac_mdio_unregister(ndev);
2267         netif_carrier_off(ndev);
2268         unregister_netdev(ndev);
2269         free_netdev(ndev);
2270
2271         return 0;
2272 }
2273
2274 #ifdef CONFIG_PM
2275 int stmmac_suspend(struct net_device *ndev)
2276 {
2277         struct stmmac_priv *priv = netdev_priv(ndev);
2278         unsigned long flags;
2279
2280         if (!ndev || !netif_running(ndev))
2281                 return 0;
2282
2283         if (priv->phydev)
2284                 phy_stop(priv->phydev);
2285
2286         spin_lock_irqsave(&priv->lock, flags);
2287
2288         netif_device_detach(ndev);
2289         netif_stop_queue(ndev);
2290
2291         napi_disable(&priv->napi);
2292
2293         /* Stop TX/RX DMA */
2294         priv->hw->dma->stop_tx(priv->ioaddr);
2295         priv->hw->dma->stop_rx(priv->ioaddr);
2296
2297         stmmac_clear_descriptors(priv);
2298
2299         /* Enable Power down mode by programming the PMT regs */
2300         if (device_may_wakeup(priv->device))
2301                 priv->hw->mac->pmt(priv->ioaddr, priv->wolopts);
2302         else {
2303                 stmmac_set_mac(priv->ioaddr, false);
2304                 /* Disable clock in case of PWM is off */
2305                 clk_disable_unprepare(priv->stmmac_clk);
2306         }
2307         spin_unlock_irqrestore(&priv->lock, flags);
2308         return 0;
2309 }
2310
2311 int stmmac_resume(struct net_device *ndev)
2312 {
2313         struct stmmac_priv *priv = netdev_priv(ndev);
2314         unsigned long flags;
2315
2316         if (!netif_running(ndev))
2317                 return 0;
2318
2319         spin_lock_irqsave(&priv->lock, flags);
2320
2321         /* Power Down bit, into the PM register, is cleared
2322          * automatically as soon as a magic packet or a Wake-up frame
2323          * is received. Anyway, it's better to manually clear
2324          * this bit because it can generate problems while resuming
2325          * from another devices (e.g. serial console). */
2326         if (device_may_wakeup(priv->device))
2327                 priv->hw->mac->pmt(priv->ioaddr, 0);
2328         else
2329                 /* enable the clk prevously disabled */
2330                 clk_prepare_enable(priv->stmmac_clk);
2331
2332         netif_device_attach(ndev);
2333
2334         /* Enable the MAC and DMA */
2335         stmmac_set_mac(priv->ioaddr, true);
2336         priv->hw->dma->start_tx(priv->ioaddr);
2337         priv->hw->dma->start_rx(priv->ioaddr);
2338
2339         napi_enable(&priv->napi);
2340
2341         netif_start_queue(ndev);
2342
2343         spin_unlock_irqrestore(&priv->lock, flags);
2344
2345         if (priv->phydev)
2346                 phy_start(priv->phydev);
2347
2348         return 0;
2349 }
2350
2351 int stmmac_freeze(struct net_device *ndev)
2352 {
2353         if (!ndev || !netif_running(ndev))
2354                 return 0;
2355
2356         return stmmac_release(ndev);
2357 }
2358
2359 int stmmac_restore(struct net_device *ndev)
2360 {
2361         if (!ndev || !netif_running(ndev))
2362                 return 0;
2363
2364         return stmmac_open(ndev);
2365 }
2366 #endif /* CONFIG_PM */
2367
2368 /* Driver can be configured w/ and w/ both PCI and Platf drivers
2369  * depending on the configuration selected.
2370  */
2371 static int __init stmmac_init(void)
2372 {
2373         int ret;
2374
2375         ret = stmmac_register_platform();
2376         if (ret)
2377                 goto err;
2378         ret = stmmac_register_pci();
2379         if (ret)
2380                 goto err_pci;
2381         return 0;
2382 err_pci:
2383         stmmac_unregister_platform();
2384 err:
2385         pr_err("stmmac: driver registration failed\n");
2386         return ret;
2387 }
2388
2389 static void __exit stmmac_exit(void)
2390 {
2391         stmmac_unregister_platform();
2392         stmmac_unregister_pci();
2393 }
2394
2395 module_init(stmmac_init);
2396 module_exit(stmmac_exit);
2397
2398 #ifndef MODULE
2399 static int __init stmmac_cmdline_opt(char *str)
2400 {
2401         char *opt;
2402
2403         if (!str || !*str)
2404                 return -EINVAL;
2405         while ((opt = strsep(&str, ",")) != NULL) {
2406                 if (!strncmp(opt, "debug:", 6)) {
2407                         if (kstrtoint(opt + 6, 0, &debug))
2408                                 goto err;
2409                 } else if (!strncmp(opt, "phyaddr:", 8)) {
2410                         if (kstrtoint(opt + 8, 0, &phyaddr))
2411                                 goto err;
2412                 } else if (!strncmp(opt, "dma_txsize:", 11)) {
2413                         if (kstrtoint(opt + 11, 0, &dma_txsize))
2414                                 goto err;
2415                 } else if (!strncmp(opt, "dma_rxsize:", 11)) {
2416                         if (kstrtoint(opt + 11, 0, &dma_rxsize))
2417                                 goto err;
2418                 } else if (!strncmp(opt, "buf_sz:", 7)) {
2419                         if (kstrtoint(opt + 7, 0, &buf_sz))
2420                                 goto err;
2421                 } else if (!strncmp(opt, "tc:", 3)) {
2422                         if (kstrtoint(opt + 3, 0, &tc))
2423                                 goto err;
2424                 } else if (!strncmp(opt, "watchdog:", 9)) {
2425                         if (kstrtoint(opt + 9, 0, &watchdog))
2426                                 goto err;
2427                 } else if (!strncmp(opt, "flow_ctrl:", 10)) {
2428                         if (kstrtoint(opt + 10, 0, &flow_ctrl))
2429                                 goto err;
2430                 } else if (!strncmp(opt, "pause:", 6)) {
2431                         if (kstrtoint(opt + 6, 0, &pause))
2432                                 goto err;
2433                 } else if (!strncmp(opt, "eee_timer:", 10)) {
2434                         if (kstrtoint(opt + 10, 0, &eee_timer))
2435                                 goto err;
2436                 } else if (!strncmp(opt, "chain_mode:", 11)) {
2437                         if (kstrtoint(opt + 11, 0, &chain_mode))
2438                                 goto err;
2439                 }
2440         }
2441         return 0;
2442
2443 err:
2444         pr_err("%s: ERROR broken module parameter conversion", __func__);
2445         return -EINVAL;
2446 }
2447
2448 __setup("stmmaceth=", stmmac_cmdline_opt);
2449 #endif
2450
2451 MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet device driver");
2452 MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
2453 MODULE_LICENSE("GPL");