Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/net/ethernet/arc/emac_main.c

  1 /*
  2  * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  *
  8  * Driver for the ARC EMAC 10100 (hardware revision 5)
  9  *
 10  * Contributors:
 11  *              Amit Bhor
 12  *              Sameer Dhavale
 13  *              Vineet Gupta
 14  */
 15 
 16 #include <linux/crc32.h>
 17 #include <linux/etherdevice.h>
 18 #include <linux/interrupt.h>
 19 #include <linux/io.h>
 20 #include <linux/module.h>
 21 #include <linux/of_address.h>
 22 #include <linux/of_irq.h>
 23 #include <linux/of_mdio.h>
 24 #include <linux/of_net.h>
 25 #include <linux/of_platform.h>
 26 
 27 #include "emac.h"
 28 
 29 
 30 /**
 31  * arc_emac_tx_avail - Return the number of available slots in the tx ring.
 32  * @priv: Pointer to ARC EMAC private data structure.
 33  *
 34  * returns: the number of slots available for transmission in tx the ring.
 35  */
 36 static inline int arc_emac_tx_avail(struct arc_emac_priv *priv)
 37 {
 38         return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM;
 39 }
 40 
 41 /**
 42  * arc_emac_adjust_link - Adjust the PHY link duplex.
 43  * @ndev:       Pointer to the net_device structure.
 44  *
 45  * This function is called to change the duplex setting after auto negotiation
 46  * is done by the PHY.
 47  */
 48 static void arc_emac_adjust_link(struct net_device *ndev)
 49 {
 50         struct arc_emac_priv *priv = netdev_priv(ndev);
 51         struct phy_device *phy_dev = priv->phy_dev;
 52         unsigned int reg, state_changed = 0;
 53 
 54         if (priv->link != phy_dev->link) {
 55                 priv->link = phy_dev->link;
 56                 state_changed = 1;
 57         }
 58 
 59         if (priv->speed != phy_dev->speed) {
 60                 priv->speed = phy_dev->speed;
 61                 state_changed = 1;
 62                 if (priv->set_mac_speed)
 63                         priv->set_mac_speed(priv, priv->speed);
 64         }
 65 
 66         if (priv->duplex != phy_dev->duplex) {
 67                 reg = arc_reg_get(priv, R_CTRL);
 68 
 69                 if (DUPLEX_FULL == phy_dev->duplex)
 70                         reg |= ENFL_MASK;
 71                 else
 72                         reg &= ~ENFL_MASK;
 73 
 74                 arc_reg_set(priv, R_CTRL, reg);
 75                 priv->duplex = phy_dev->duplex;
 76                 state_changed = 1;
 77         }
 78 
 79         if (state_changed)
 80                 phy_print_status(phy_dev);
 81 }
 82 
 83 /**
 84  * arc_emac_get_settings - Get PHY settings.
 85  * @ndev:       Pointer to net_device structure.
 86  * @cmd:        Pointer to ethtool_cmd structure.
 87  *
 88  * This implements ethtool command for getting PHY settings. If PHY could
 89  * not be found, the function returns -ENODEV. This function calls the
 90  * relevant PHY ethtool API to get the PHY settings.
 91  * Issue "ethtool ethX" under linux prompt to execute this function.
 92  */
 93 static int arc_emac_get_settings(struct net_device *ndev,
 94                                  struct ethtool_cmd *cmd)
 95 {
 96         struct arc_emac_priv *priv = netdev_priv(ndev);
 97 
 98         return phy_ethtool_gset(priv->phy_dev, cmd);
 99 }
100 
101 /**
102  * arc_emac_set_settings - Set PHY settings as passed in the argument.
103  * @ndev:       Pointer to net_device structure.
104  * @cmd:        Pointer to ethtool_cmd structure.
105  *
106  * This implements ethtool command for setting various PHY settings. If PHY
107  * could not be found, the function returns -ENODEV. This function calls the
108  * relevant PHY ethtool API to set the PHY.
109  * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this
110  * function.
111  */
112 static int arc_emac_set_settings(struct net_device *ndev,
113                                  struct ethtool_cmd *cmd)
114 {
115         struct arc_emac_priv *priv = netdev_priv(ndev);
116 
117         if (!capable(CAP_NET_ADMIN))
118                 return -EPERM;
119 
120         return phy_ethtool_sset(priv->phy_dev, cmd);
121 }
122 
123 /**
124  * arc_emac_get_drvinfo - Get EMAC driver information.
125  * @ndev:       Pointer to net_device structure.
126  * @info:       Pointer to ethtool_drvinfo structure.
127  *
128  * This implements ethtool command for getting the driver information.
129  * Issue "ethtool -i ethX" under linux prompt to execute this function.
130  */
131 static void arc_emac_get_drvinfo(struct net_device *ndev,
132                                  struct ethtool_drvinfo *info)
133 {
134         struct arc_emac_priv *priv = netdev_priv(ndev);
135 
136         strlcpy(info->driver, priv->drv_name, sizeof(info->driver));
137         strlcpy(info->version, priv->drv_version, sizeof(info->version));
138 }
139 
140 static const struct ethtool_ops arc_emac_ethtool_ops = {
141         .get_settings   = arc_emac_get_settings,
142         .set_settings   = arc_emac_set_settings,
143         .get_drvinfo    = arc_emac_get_drvinfo,
144         .get_link       = ethtool_op_get_link,
145 };
146 
147 #define FIRST_OR_LAST_MASK      (FIRST_MASK | LAST_MASK)
148 
149 /**
150  * arc_emac_tx_clean - clears processed by EMAC Tx BDs.
151  * @ndev:       Pointer to the network device.
152  */
153 static void arc_emac_tx_clean(struct net_device *ndev)
154 {
155         struct arc_emac_priv *priv = netdev_priv(ndev);
156         struct net_device_stats *stats = &ndev->stats;
157         unsigned int i;
158 
159         for (i = 0; i < TX_BD_NUM; i++) {
160                 unsigned int *txbd_dirty = &priv->txbd_dirty;
161                 struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty];
162                 struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty];
163                 struct sk_buff *skb = tx_buff->skb;
164                 unsigned int info = le32_to_cpu(txbd->info);
165 
166                 if ((info & FOR_EMAC) || !txbd->data)
167                         break;
168 
169                 if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) {
170                         stats->tx_errors++;
171                         stats->tx_dropped++;
172 
173                         if (info & DEFR)
174                                 stats->tx_carrier_errors++;
175 
176                         if (info & LTCL)
177                                 stats->collisions++;
178 
179                         if (info & UFLO)
180                                 stats->tx_fifo_errors++;
181                 } else if (likely(info & FIRST_OR_LAST_MASK)) {
182                         stats->tx_packets++;
183                         stats->tx_bytes += skb->len;
184                 }
185 
186                 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
187                                  dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
188 
189                 /* return the sk_buff to system */
190                 dev_kfree_skb_irq(skb);
191 
192                 txbd->data = 0;
193                 txbd->info = 0;
194 
195                 *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
196         }
197 
198         /* Ensure that txbd_dirty is visible to tx() before checking
199          * for queue stopped.
200          */
201         smp_mb();
202 
203         if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv))
204                 netif_wake_queue(ndev);
205 }
206 
207 /**
208  * arc_emac_rx - processing of Rx packets.
209  * @ndev:       Pointer to the network device.
210  * @budget:     How many BDs to process on 1 call.
211  *
212  * returns:     Number of processed BDs
213  *
214  * Iterate through Rx BDs and deliver received packages to upper layer.
215  */
216 static int arc_emac_rx(struct net_device *ndev, int budget)
217 {
218         struct arc_emac_priv *priv = netdev_priv(ndev);
219         unsigned int work_done;
220 
221         for (work_done = 0; work_done < budget; work_done++) {
222                 unsigned int *last_rx_bd = &priv->last_rx_bd;
223                 struct net_device_stats *stats = &ndev->stats;
224                 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
225                 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
226                 unsigned int pktlen, info = le32_to_cpu(rxbd->info);
227                 struct sk_buff *skb;
228                 dma_addr_t addr;
229 
230                 if (unlikely((info & OWN_MASK) == FOR_EMAC))
231                         break;
232 
233                 /* Make a note that we saw a packet at this BD.
234                  * So next time, driver starts from this + 1
235                  */
236                 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
237 
238                 if (unlikely((info & FIRST_OR_LAST_MASK) !=
239                              FIRST_OR_LAST_MASK)) {
240                         /* We pre-allocate buffers of MTU size so incoming
241                          * packets won't be split/chained.
242                          */
243                         if (net_ratelimit())
244                                 netdev_err(ndev, "incomplete packet received\n");
245 
246                         /* Return ownership to EMAC */
247                         rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
248                         stats->rx_errors++;
249                         stats->rx_length_errors++;
250                         continue;
251                 }
252 
253                 pktlen = info & LEN_MASK;
254                 stats->rx_packets++;
255                 stats->rx_bytes += pktlen;
256                 skb = rx_buff->skb;
257                 skb_put(skb, pktlen);
258                 skb->dev = ndev;
259                 skb->protocol = eth_type_trans(skb, ndev);
260 
261                 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
262                                  dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
263 
264                 /* Prepare the BD for next cycle */
265                 rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
266                                                          EMAC_BUFFER_SIZE);
267                 if (unlikely(!rx_buff->skb)) {
268                         stats->rx_errors++;
269                         /* Because receive_skb is below, increment rx_dropped */
270                         stats->rx_dropped++;
271                         continue;
272                 }
273 
274                 /* receive_skb only if new skb was allocated to avoid holes */
275                 netif_receive_skb(skb);
276 
277                 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
278                                       EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
279                 if (dma_mapping_error(&ndev->dev, addr)) {
280                         if (net_ratelimit())
281                                 netdev_err(ndev, "cannot dma map\n");
282                         dev_kfree_skb(rx_buff->skb);
283                         stats->rx_errors++;
284                         continue;
285                 }
286                 dma_unmap_addr_set(rx_buff, addr, addr);
287                 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
288 
289                 rxbd->data = cpu_to_le32(addr);
290 
291                 /* Make sure pointer to data buffer is set */
292                 wmb();
293 
294                 /* Return ownership to EMAC */
295                 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
296         }
297 
298         return work_done;
299 }
300 
301 /**
302  * arc_emac_poll - NAPI poll handler.
303  * @napi:       Pointer to napi_struct structure.
304  * @budget:     How many BDs to process on 1 call.
305  *
306  * returns:     Number of processed BDs
307  */
308 static int arc_emac_poll(struct napi_struct *napi, int budget)
309 {
310         struct net_device *ndev = napi->dev;
311         struct arc_emac_priv *priv = netdev_priv(ndev);
312         unsigned int work_done;
313 
314         arc_emac_tx_clean(ndev);
315 
316         work_done = arc_emac_rx(ndev, budget);
317         if (work_done < budget) {
318                 napi_complete(napi);
319                 arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
320         }
321 
322         return work_done;
323 }
324 
325 /**
326  * arc_emac_intr - Global interrupt handler for EMAC.
327  * @irq:                irq number.
328  * @dev_instance:       device instance.
329  *
330  * returns: IRQ_HANDLED for all cases.
331  *
332  * ARC EMAC has only 1 interrupt line, and depending on bits raised in
333  * STATUS register we may tell what is a reason for interrupt to fire.
334  */
335 static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
336 {
337         struct net_device *ndev = dev_instance;
338         struct arc_emac_priv *priv = netdev_priv(ndev);
339         struct net_device_stats *stats = &ndev->stats;
340         unsigned int status;
341 
342         status = arc_reg_get(priv, R_STATUS);
343         status &= ~MDIO_MASK;
344 
345         /* Reset all flags except "MDIO complete" */
346         arc_reg_set(priv, R_STATUS, status);
347 
348         if (status & (RXINT_MASK | TXINT_MASK)) {
349                 if (likely(napi_schedule_prep(&priv->napi))) {
350                         arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
351                         __napi_schedule(&priv->napi);
352                 }
353         }
354 
355         if (status & ERR_MASK) {
356                 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
357                  * 8-bit error counter overrun.
358                  */
359 
360                 if (status & MSER_MASK) {
361                         stats->rx_missed_errors += 0x100;
362                         stats->rx_errors += 0x100;
363                 }
364 
365                 if (status & RXCR_MASK) {
366                         stats->rx_crc_errors += 0x100;
367                         stats->rx_errors += 0x100;
368                 }
369 
370                 if (status & RXFR_MASK) {
371                         stats->rx_frame_errors += 0x100;
372                         stats->rx_errors += 0x100;
373                 }
374 
375                 if (status & RXFL_MASK) {
376                         stats->rx_over_errors += 0x100;
377                         stats->rx_errors += 0x100;
378                 }
379         }
380 
381         return IRQ_HANDLED;
382 }
383 
384 #ifdef CONFIG_NET_POLL_CONTROLLER
385 static void arc_emac_poll_controller(struct net_device *dev)
386 {
387         disable_irq(dev->irq);
388         arc_emac_intr(dev->irq, dev);
389         enable_irq(dev->irq);
390 }
391 #endif
392 
393 /**
394  * arc_emac_open - Open the network device.
395  * @ndev:       Pointer to the network device.
396  *
397  * returns: 0, on success or non-zero error value on failure.
398  *
399  * This function sets the MAC address, requests and enables an IRQ
400  * for the EMAC device and starts the Tx queue.
401  * It also connects to the phy device.
402  */
403 static int arc_emac_open(struct net_device *ndev)
404 {
405         struct arc_emac_priv *priv = netdev_priv(ndev);
406         struct phy_device *phy_dev = priv->phy_dev;
407         int i;
408 
409         phy_dev->autoneg = AUTONEG_ENABLE;
410         phy_dev->speed = 0;
411         phy_dev->duplex = 0;
412         phy_dev->advertising &= phy_dev->supported;
413 
414         priv->last_rx_bd = 0;
415 
416         /* Allocate and set buffers for Rx BD's */
417         for (i = 0; i < RX_BD_NUM; i++) {
418                 dma_addr_t addr;
419                 unsigned int *last_rx_bd = &priv->last_rx_bd;
420                 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
421                 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
422 
423                 rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
424                                                          EMAC_BUFFER_SIZE);
425                 if (unlikely(!rx_buff->skb))
426                         return -ENOMEM;
427 
428                 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
429                                       EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
430                 if (dma_mapping_error(&ndev->dev, addr)) {
431                         netdev_err(ndev, "cannot dma map\n");
432                         dev_kfree_skb(rx_buff->skb);
433                         return -ENOMEM;
434                 }
435                 dma_unmap_addr_set(rx_buff, addr, addr);
436                 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
437 
438                 rxbd->data = cpu_to_le32(addr);
439 
440                 /* Make sure pointer to data buffer is set */
441                 wmb();
442 
443                 /* Return ownership to EMAC */
444                 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
445 
446                 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
447         }
448 
449         /* Clean Tx BD's */
450         memset(priv->txbd, 0, TX_RING_SZ);
451 
452         /* Initialize logical address filter */
453         arc_reg_set(priv, R_LAFL, 0);
454         arc_reg_set(priv, R_LAFH, 0);
455 
456         /* Set BD ring pointers for device side */
457         arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma);
458         arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma);
459 
460         /* Enable interrupts */
461         arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
462 
463         /* Set CONTROL */
464         arc_reg_set(priv, R_CTRL,
465                      (RX_BD_NUM << 24) |        /* RX BD table length */
466                      (TX_BD_NUM << 16) |        /* TX BD table length */
467                      TXRN_MASK | RXRN_MASK);
468 
469         napi_enable(&priv->napi);
470 
471         /* Enable EMAC */
472         arc_reg_or(priv, R_CTRL, EN_MASK);
473 
474         phy_start_aneg(priv->phy_dev);
475 
476         netif_start_queue(ndev);
477 
478         return 0;
479 }
480 
481 /**
482  * arc_emac_set_rx_mode - Change the receive filtering mode.
483  * @ndev:       Pointer to the network device.
484  *
485  * This function enables/disables promiscuous or all-multicast mode
486  * and updates the multicast filtering list of the network device.
487  */
488 static void arc_emac_set_rx_mode(struct net_device *ndev)
489 {
490         struct arc_emac_priv *priv = netdev_priv(ndev);
491 
492         if (ndev->flags & IFF_PROMISC) {
493                 arc_reg_or(priv, R_CTRL, PROM_MASK);
494         } else {
495                 arc_reg_clr(priv, R_CTRL, PROM_MASK);
496 
497                 if (ndev->flags & IFF_ALLMULTI) {
498                         arc_reg_set(priv, R_LAFL, ~0);
499                         arc_reg_set(priv, R_LAFH, ~0);
500                 } else {
501                         struct netdev_hw_addr *ha;
502                         unsigned int filter[2] = { 0, 0 };
503                         int bit;
504 
505                         netdev_for_each_mc_addr(ha, ndev) {
506                                 bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26;
507                                 filter[bit >> 5] |= 1 << (bit & 31);
508                         }
509 
510                         arc_reg_set(priv, R_LAFL, filter[0]);
511                         arc_reg_set(priv, R_LAFH, filter[1]);
512                 }
513         }
514 }
515 
516 /**
517  * arc_emac_stop - Close the network device.
518  * @ndev:       Pointer to the network device.
519  *
520  * This function stops the Tx queue, disables interrupts and frees the IRQ for
521  * the EMAC device.
522  * It also disconnects the PHY device associated with the EMAC device.
523  */
524 static int arc_emac_stop(struct net_device *ndev)
525 {
526         struct arc_emac_priv *priv = netdev_priv(ndev);
527 
528         napi_disable(&priv->napi);
529         netif_stop_queue(ndev);
530 
531         /* Disable interrupts */
532         arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
533 
534         /* Disable EMAC */
535         arc_reg_clr(priv, R_CTRL, EN_MASK);
536 
537         return 0;
538 }
539 
540 /**
541  * arc_emac_stats - Get system network statistics.
542  * @ndev:       Pointer to net_device structure.
543  *
544  * Returns the address of the device statistics structure.
545  * Statistics are updated in interrupt handler.
546  */
547 static struct net_device_stats *arc_emac_stats(struct net_device *ndev)
548 {
549         struct arc_emac_priv *priv = netdev_priv(ndev);
550         struct net_device_stats *stats = &ndev->stats;
551         unsigned long miss, rxerr;
552         u8 rxcrc, rxfram, rxoflow;
553 
554         rxerr = arc_reg_get(priv, R_RXERR);
555         miss = arc_reg_get(priv, R_MISS);
556 
557         rxcrc = rxerr;
558         rxfram = rxerr >> 8;
559         rxoflow = rxerr >> 16;
560 
561         stats->rx_errors += miss;
562         stats->rx_errors += rxcrc + rxfram + rxoflow;
563 
564         stats->rx_over_errors += rxoflow;
565         stats->rx_frame_errors += rxfram;
566         stats->rx_crc_errors += rxcrc;
567         stats->rx_missed_errors += miss;
568 
569         return stats;
570 }
571 
572 /**
573  * arc_emac_tx - Starts the data transmission.
574  * @skb:        sk_buff pointer that contains data to be Transmitted.
575  * @ndev:       Pointer to net_device structure.
576  *
577  * returns: NETDEV_TX_OK, on success
578  *              NETDEV_TX_BUSY, if any of the descriptors are not free.
579  *
580  * This function is invoked from upper layers to initiate transmission.
581  */
582 static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
583 {
584         struct arc_emac_priv *priv = netdev_priv(ndev);
585         unsigned int len, *txbd_curr = &priv->txbd_curr;
586         struct net_device_stats *stats = &ndev->stats;
587         __le32 *info = &priv->txbd[*txbd_curr].info;
588         dma_addr_t addr;
589 
590         if (skb_padto(skb, ETH_ZLEN))
591                 return NETDEV_TX_OK;
592 
593         len = max_t(unsigned int, ETH_ZLEN, skb->len);
594 
595         if (unlikely(!arc_emac_tx_avail(priv))) {
596                 netif_stop_queue(ndev);
597                 netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n");
598                 return NETDEV_TX_BUSY;
599         }
600 
601         addr = dma_map_single(&ndev->dev, (void *)skb->data, len,
602                               DMA_TO_DEVICE);
603 
604         if (unlikely(dma_mapping_error(&ndev->dev, addr))) {
605                 stats->tx_dropped++;
606                 stats->tx_errors++;
607                 dev_kfree_skb(skb);
608                 return NETDEV_TX_OK;
609         }
610         dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr);
611         dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len);
612 
613         priv->tx_buff[*txbd_curr].skb = skb;
614         priv->txbd[*txbd_curr].data = cpu_to_le32(addr);
615 
616         /* Make sure pointer to data buffer is set */
617         wmb();
618 
619         skb_tx_timestamp(skb);
620 
621         *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len);
622 
623         /* Increment index to point to the next BD */
624         *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM;
625 
626         /* Ensure that tx_clean() sees the new txbd_curr before
627          * checking the queue status. This prevents an unneeded wake
628          * of the queue in tx_clean().
629          */
630         smp_mb();
631 
632         if (!arc_emac_tx_avail(priv)) {
633                 netif_stop_queue(ndev);
634                 /* Refresh tx_dirty */
635                 smp_mb();
636                 if (arc_emac_tx_avail(priv))
637                         netif_start_queue(ndev);
638         }
639 
640         arc_reg_set(priv, R_STATUS, TXPL_MASK);
641 
642         return NETDEV_TX_OK;
643 }
644 
645 static void arc_emac_set_address_internal(struct net_device *ndev)
646 {
647         struct arc_emac_priv *priv = netdev_priv(ndev);
648         unsigned int addr_low, addr_hi;
649 
650         addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]);
651         addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]);
652 
653         arc_reg_set(priv, R_ADDRL, addr_low);
654         arc_reg_set(priv, R_ADDRH, addr_hi);
655 }
656 
657 /**
658  * arc_emac_set_address - Set the MAC address for this device.
659  * @ndev:       Pointer to net_device structure.
660  * @p:          6 byte Address to be written as MAC address.
661  *
662  * This function copies the HW address from the sockaddr structure to the
663  * net_device structure and updates the address in HW.
664  *
665  * returns:     -EBUSY if the net device is busy or 0 if the address is set
666  *              successfully.
667  */
668 static int arc_emac_set_address(struct net_device *ndev, void *p)
669 {
670         struct sockaddr *addr = p;
671 
672         if (netif_running(ndev))
673                 return -EBUSY;
674 
675         if (!is_valid_ether_addr(addr->sa_data))
676                 return -EADDRNOTAVAIL;
677 
678         memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
679 
680         arc_emac_set_address_internal(ndev);
681 
682         return 0;
683 }
684 
685 static const struct net_device_ops arc_emac_netdev_ops = {
686         .ndo_open               = arc_emac_open,
687         .ndo_stop               = arc_emac_stop,
688         .ndo_start_xmit         = arc_emac_tx,
689         .ndo_set_mac_address    = arc_emac_set_address,
690         .ndo_get_stats          = arc_emac_stats,
691         .ndo_set_rx_mode        = arc_emac_set_rx_mode,
692 #ifdef CONFIG_NET_POLL_CONTROLLER
693         .ndo_poll_controller    = arc_emac_poll_controller,
694 #endif
695 };
696 
697 int arc_emac_probe(struct net_device *ndev, int interface)
698 {
699         struct device *dev = ndev->dev.parent;
700         struct resource res_regs;
701         struct device_node *phy_node;
702         struct arc_emac_priv *priv;
703         const char *mac_addr;
704         unsigned int id, clock_frequency, irq;
705         int err;
706 
707 
708         /* Get PHY from device tree */
709         phy_node = of_parse_phandle(dev->of_node, "phy", 0);
710         if (!phy_node) {
711                 dev_err(dev, "failed to retrieve phy description from device tree\n");
712                 return -ENODEV;
713         }
714 
715         /* Get EMAC registers base address from device tree */
716         err = of_address_to_resource(dev->of_node, 0, &res_regs);
717         if (err) {
718                 dev_err(dev, "failed to retrieve registers base from device tree\n");
719                 return -ENODEV;
720         }
721 
722         /* Get IRQ from device tree */
723         irq = irq_of_parse_and_map(dev->of_node, 0);
724         if (!irq) {
725                 dev_err(dev, "failed to retrieve <irq> value from device tree\n");
726                 return -ENODEV;
727         }
728 
729 
730         ndev->netdev_ops = &arc_emac_netdev_ops;
731         ndev->ethtool_ops = &arc_emac_ethtool_ops;
732         ndev->watchdog_timeo = TX_TIMEOUT;
733         /* FIXME :: no multicast support yet */
734         ndev->flags &= ~IFF_MULTICAST;
735 
736         priv = netdev_priv(ndev);
737         priv->dev = dev;
738 
739         priv->regs = devm_ioremap_resource(dev, &res_regs);
740         if (IS_ERR(priv->regs)) {
741                 return PTR_ERR(priv->regs);
742         }
743         dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs);
744 
745         if (priv->clk) {
746                 err = clk_prepare_enable(priv->clk);
747                 if (err) {
748                         dev_err(dev, "failed to enable clock\n");
749                         return err;
750                 }
751 
752                 clock_frequency = clk_get_rate(priv->clk);
753         } else {
754                 /* Get CPU clock frequency from device tree */
755                 if (of_property_read_u32(dev->of_node, "clock-frequency",
756                                          &clock_frequency)) {
757                         dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n");
758                         return -EINVAL;
759                 }
760         }
761 
762         id = arc_reg_get(priv, R_ID);
763 
764         /* Check for EMAC revision 5 or 7, magic number */
765         if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
766                 dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id);
767                 err = -ENODEV;
768                 goto out_clken;
769         }
770         dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id);
771 
772         /* Set poll rate so that it polls every 1 ms */
773         arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000);
774 
775         ndev->irq = irq;
776         dev_info(dev, "IRQ is %d\n", ndev->irq);
777 
778         /* Register interrupt handler for device */
779         err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0,
780                                ndev->name, ndev);
781         if (err) {
782                 dev_err(dev, "could not allocate IRQ\n");
783                 goto out_clken;
784         }
785 
786         /* Get MAC address from device tree */
787         mac_addr = of_get_mac_address(dev->of_node);
788 
789         if (mac_addr)
790                 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
791         else
792                 eth_hw_addr_random(ndev);
793 
794         arc_emac_set_address_internal(ndev);
795         dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
796 
797         /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
798         priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ,
799                                          &priv->rxbd_dma, GFP_KERNEL);
800 
801         if (!priv->rxbd) {
802                 dev_err(dev, "failed to allocate data buffers\n");
803                 err = -ENOMEM;
804                 goto out_clken;
805         }
806 
807         priv->txbd = priv->rxbd + RX_BD_NUM;
808 
809         priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ;
810         dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
811                 (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma);
812 
813         err = arc_mdio_probe(priv);
814         if (err) {
815                 dev_err(dev, "failed to probe MII bus\n");
816                 goto out_clken;
817         }
818 
819         priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
820                                        interface);
821         if (!priv->phy_dev) {
822                 dev_err(dev, "of_phy_connect() failed\n");
823                 err = -ENODEV;
824                 goto out_mdio;
825         }
826 
827         dev_info(dev, "connected to %s phy with id 0x%x\n",
828                  priv->phy_dev->drv->name, priv->phy_dev->phy_id);
829 
830         netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT);
831 
832         err = register_netdev(ndev);
833         if (err) {
834                 dev_err(dev, "failed to register network device\n");
835                 goto out_netif_api;
836         }
837 
838         return 0;
839 
840 out_netif_api:
841         netif_napi_del(&priv->napi);
842         phy_disconnect(priv->phy_dev);
843         priv->phy_dev = NULL;
844 out_mdio:
845         arc_mdio_remove(priv);
846 out_clken:
847         if (priv->clk)
848                 clk_disable_unprepare(priv->clk);
849         return err;
850 }
851 EXPORT_SYMBOL_GPL(arc_emac_probe);
852 
853 int arc_emac_remove(struct net_device *ndev)
854 {
855         struct arc_emac_priv *priv = netdev_priv(ndev);
856 
857         phy_disconnect(priv->phy_dev);
858         priv->phy_dev = NULL;
859         arc_mdio_remove(priv);
860         unregister_netdev(ndev);
861         netif_napi_del(&priv->napi);
862 
863         if (!IS_ERR(priv->clk)) {
864                 clk_disable_unprepare(priv->clk);
865         }
866 
867 
868         return 0;
869 }
870 EXPORT_SYMBOL_GPL(arc_emac_remove);
871 
872 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
873 MODULE_DESCRIPTION("ARC EMAC driver");
874 MODULE_LICENSE("GPL");
875 

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