Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 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

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/etherdevice.h>
 17 #include <linux/interrupt.h>
 18 #include <linux/io.h>
 19 #include <linux/module.h>
 20 #include <linux/of_address.h>
 21 #include <linux/of_irq.h>
 22 #include <linux/of_mdio.h>
 23 #include <linux/of_net.h>
 24 #include <linux/of_platform.h>
 25 
 26 #include "emac.h"
 27 
 28 #define DRV_NAME        "arc_emac"
 29 #define DRV_VERSION     "1.0"
 30 
 31 /**
 32  * arc_emac_adjust_link - Adjust the PHY link duplex.
 33  * @ndev:       Pointer to the net_device structure.
 34  *
 35  * This function is called to change the duplex setting after auto negotiation
 36  * is done by the PHY.
 37  */
 38 static void arc_emac_adjust_link(struct net_device *ndev)
 39 {
 40         struct arc_emac_priv *priv = netdev_priv(ndev);
 41         struct phy_device *phy_dev = priv->phy_dev;
 42         unsigned int reg, state_changed = 0;
 43 
 44         if (priv->link != phy_dev->link) {
 45                 priv->link = phy_dev->link;
 46                 state_changed = 1;
 47         }
 48 
 49         if (priv->speed != phy_dev->speed) {
 50                 priv->speed = phy_dev->speed;
 51                 state_changed = 1;
 52         }
 53 
 54         if (priv->duplex != phy_dev->duplex) {
 55                 reg = arc_reg_get(priv, R_CTRL);
 56 
 57                 if (DUPLEX_FULL == phy_dev->duplex)
 58                         reg |= ENFL_MASK;
 59                 else
 60                         reg &= ~ENFL_MASK;
 61 
 62                 arc_reg_set(priv, R_CTRL, reg);
 63                 priv->duplex = phy_dev->duplex;
 64                 state_changed = 1;
 65         }
 66 
 67         if (state_changed)
 68                 phy_print_status(phy_dev);
 69 }
 70 
 71 /**
 72  * arc_emac_get_settings - Get PHY settings.
 73  * @ndev:       Pointer to net_device structure.
 74  * @cmd:        Pointer to ethtool_cmd structure.
 75  *
 76  * This implements ethtool command for getting PHY settings. If PHY could
 77  * not be found, the function returns -ENODEV. This function calls the
 78  * relevant PHY ethtool API to get the PHY settings.
 79  * Issue "ethtool ethX" under linux prompt to execute this function.
 80  */
 81 static int arc_emac_get_settings(struct net_device *ndev,
 82                                  struct ethtool_cmd *cmd)
 83 {
 84         struct arc_emac_priv *priv = netdev_priv(ndev);
 85 
 86         return phy_ethtool_gset(priv->phy_dev, cmd);
 87 }
 88 
 89 /**
 90  * arc_emac_set_settings - Set PHY settings as passed in the argument.
 91  * @ndev:       Pointer to net_device structure.
 92  * @cmd:        Pointer to ethtool_cmd structure.
 93  *
 94  * This implements ethtool command for setting various PHY settings. If PHY
 95  * could not be found, the function returns -ENODEV. This function calls the
 96  * relevant PHY ethtool API to set the PHY.
 97  * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this
 98  * function.
 99  */
100 static int arc_emac_set_settings(struct net_device *ndev,
101                                  struct ethtool_cmd *cmd)
102 {
103         struct arc_emac_priv *priv = netdev_priv(ndev);
104 
105         if (!capable(CAP_NET_ADMIN))
106                 return -EPERM;
107 
108         return phy_ethtool_sset(priv->phy_dev, cmd);
109 }
110 
111 /**
112  * arc_emac_get_drvinfo - Get EMAC driver information.
113  * @ndev:       Pointer to net_device structure.
114  * @info:       Pointer to ethtool_drvinfo structure.
115  *
116  * This implements ethtool command for getting the driver information.
117  * Issue "ethtool -i ethX" under linux prompt to execute this function.
118  */
119 static void arc_emac_get_drvinfo(struct net_device *ndev,
120                                  struct ethtool_drvinfo *info)
121 {
122         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
123         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
124 }
125 
126 static const struct ethtool_ops arc_emac_ethtool_ops = {
127         .get_settings   = arc_emac_get_settings,
128         .set_settings   = arc_emac_set_settings,
129         .get_drvinfo    = arc_emac_get_drvinfo,
130         .get_link       = ethtool_op_get_link,
131 };
132 
133 #define FIRST_OR_LAST_MASK      (FIRST_MASK | LAST_MASK)
134 
135 /**
136  * arc_emac_tx_clean - clears processed by EMAC Tx BDs.
137  * @ndev:       Pointer to the network device.
138  */
139 static void arc_emac_tx_clean(struct net_device *ndev)
140 {
141         struct arc_emac_priv *priv = netdev_priv(ndev);
142         struct net_device_stats *stats = &priv->stats;
143         unsigned int i;
144 
145         for (i = 0; i < TX_BD_NUM; i++) {
146                 unsigned int *txbd_dirty = &priv->txbd_dirty;
147                 struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty];
148                 struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty];
149                 struct sk_buff *skb = tx_buff->skb;
150                 unsigned int info = le32_to_cpu(txbd->info);
151 
152                 if ((info & FOR_EMAC) || !txbd->data)
153                         break;
154 
155                 if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) {
156                         stats->tx_errors++;
157                         stats->tx_dropped++;
158 
159                         if (info & DEFR)
160                                 stats->tx_carrier_errors++;
161 
162                         if (info & LTCL)
163                                 stats->collisions++;
164 
165                         if (info & UFLO)
166                                 stats->tx_fifo_errors++;
167                 } else if (likely(info & FIRST_OR_LAST_MASK)) {
168                         stats->tx_packets++;
169                         stats->tx_bytes += skb->len;
170                 }
171 
172                 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
173                                  dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
174 
175                 /* return the sk_buff to system */
176                 dev_kfree_skb_irq(skb);
177 
178                 txbd->data = 0;
179                 txbd->info = 0;
180 
181                 *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
182 
183                 if (netif_queue_stopped(ndev))
184                         netif_wake_queue(ndev);
185         }
186 }
187 
188 /**
189  * arc_emac_rx - processing of Rx packets.
190  * @ndev:       Pointer to the network device.
191  * @budget:     How many BDs to process on 1 call.
192  *
193  * returns:     Number of processed BDs
194  *
195  * Iterate through Rx BDs and deliver received packages to upper layer.
196  */
197 static int arc_emac_rx(struct net_device *ndev, int budget)
198 {
199         struct arc_emac_priv *priv = netdev_priv(ndev);
200         unsigned int work_done;
201 
202         for (work_done = 0; work_done < budget; work_done++) {
203                 unsigned int *last_rx_bd = &priv->last_rx_bd;
204                 struct net_device_stats *stats = &priv->stats;
205                 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
206                 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
207                 unsigned int pktlen, info = le32_to_cpu(rxbd->info);
208                 struct sk_buff *skb;
209                 dma_addr_t addr;
210 
211                 if (unlikely((info & OWN_MASK) == FOR_EMAC))
212                         break;
213 
214                 /* Make a note that we saw a packet at this BD.
215                  * So next time, driver starts from this + 1
216                  */
217                 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
218 
219                 if (unlikely((info & FIRST_OR_LAST_MASK) !=
220                              FIRST_OR_LAST_MASK)) {
221                         /* We pre-allocate buffers of MTU size so incoming
222                          * packets won't be split/chained.
223                          */
224                         if (net_ratelimit())
225                                 netdev_err(ndev, "incomplete packet received\n");
226 
227                         /* Return ownership to EMAC */
228                         rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
229                         stats->rx_errors++;
230                         stats->rx_length_errors++;
231                         continue;
232                 }
233 
234                 pktlen = info & LEN_MASK;
235                 stats->rx_packets++;
236                 stats->rx_bytes += pktlen;
237                 skb = rx_buff->skb;
238                 skb_put(skb, pktlen);
239                 skb->dev = ndev;
240                 skb->protocol = eth_type_trans(skb, ndev);
241 
242                 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
243                                  dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
244 
245                 /* Prepare the BD for next cycle */
246                 rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
247                                                          EMAC_BUFFER_SIZE);
248                 if (unlikely(!rx_buff->skb)) {
249                         stats->rx_errors++;
250                         /* Because receive_skb is below, increment rx_dropped */
251                         stats->rx_dropped++;
252                         continue;
253                 }
254 
255                 /* receive_skb only if new skb was allocated to avoid holes */
256                 netif_receive_skb(skb);
257 
258                 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
259                                       EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
260                 if (dma_mapping_error(&ndev->dev, addr)) {
261                         if (net_ratelimit())
262                                 netdev_err(ndev, "cannot dma map\n");
263                         dev_kfree_skb(rx_buff->skb);
264                         stats->rx_errors++;
265                         continue;
266                 }
267                 dma_unmap_addr_set(rx_buff, addr, addr);
268                 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
269 
270                 rxbd->data = cpu_to_le32(addr);
271 
272                 /* Make sure pointer to data buffer is set */
273                 wmb();
274 
275                 /* Return ownership to EMAC */
276                 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
277         }
278 
279         return work_done;
280 }
281 
282 /**
283  * arc_emac_poll - NAPI poll handler.
284  * @napi:       Pointer to napi_struct structure.
285  * @budget:     How many BDs to process on 1 call.
286  *
287  * returns:     Number of processed BDs
288  */
289 static int arc_emac_poll(struct napi_struct *napi, int budget)
290 {
291         struct net_device *ndev = napi->dev;
292         struct arc_emac_priv *priv = netdev_priv(ndev);
293         unsigned int work_done;
294 
295         arc_emac_tx_clean(ndev);
296 
297         work_done = arc_emac_rx(ndev, budget);
298         if (work_done < budget) {
299                 napi_complete(napi);
300                 arc_reg_or(priv, R_ENABLE, RXINT_MASK);
301         }
302 
303         return work_done;
304 }
305 
306 /**
307  * arc_emac_intr - Global interrupt handler for EMAC.
308  * @irq:                irq number.
309  * @dev_instance:       device instance.
310  *
311  * returns: IRQ_HANDLED for all cases.
312  *
313  * ARC EMAC has only 1 interrupt line, and depending on bits raised in
314  * STATUS register we may tell what is a reason for interrupt to fire.
315  */
316 static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
317 {
318         struct net_device *ndev = dev_instance;
319         struct arc_emac_priv *priv = netdev_priv(ndev);
320         struct net_device_stats *stats = &priv->stats;
321         unsigned int status;
322 
323         status = arc_reg_get(priv, R_STATUS);
324         status &= ~MDIO_MASK;
325 
326         /* Reset all flags except "MDIO complete" */
327         arc_reg_set(priv, R_STATUS, status);
328 
329         if (status & RXINT_MASK) {
330                 if (likely(napi_schedule_prep(&priv->napi))) {
331                         arc_reg_clr(priv, R_ENABLE, RXINT_MASK);
332                         __napi_schedule(&priv->napi);
333                 }
334         }
335 
336         if (status & ERR_MASK) {
337                 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
338                  * 8-bit error counter overrun.
339                  */
340 
341                 if (status & MSER_MASK) {
342                         stats->rx_missed_errors += 0x100;
343                         stats->rx_errors += 0x100;
344                 }
345 
346                 if (status & RXCR_MASK) {
347                         stats->rx_crc_errors += 0x100;
348                         stats->rx_errors += 0x100;
349                 }
350 
351                 if (status & RXFR_MASK) {
352                         stats->rx_frame_errors += 0x100;
353                         stats->rx_errors += 0x100;
354                 }
355 
356                 if (status & RXFL_MASK) {
357                         stats->rx_over_errors += 0x100;
358                         stats->rx_errors += 0x100;
359                 }
360         }
361 
362         return IRQ_HANDLED;
363 }
364 
365 /**
366  * arc_emac_open - Open the network device.
367  * @ndev:       Pointer to the network device.
368  *
369  * returns: 0, on success or non-zero error value on failure.
370  *
371  * This function sets the MAC address, requests and enables an IRQ
372  * for the EMAC device and starts the Tx queue.
373  * It also connects to the phy device.
374  */
375 static int arc_emac_open(struct net_device *ndev)
376 {
377         struct arc_emac_priv *priv = netdev_priv(ndev);
378         struct phy_device *phy_dev = priv->phy_dev;
379         int i;
380 
381         phy_dev->autoneg = AUTONEG_ENABLE;
382         phy_dev->speed = 0;
383         phy_dev->duplex = 0;
384         phy_dev->advertising &= phy_dev->supported;
385 
386         priv->last_rx_bd = 0;
387 
388         /* Allocate and set buffers for Rx BD's */
389         for (i = 0; i < RX_BD_NUM; i++) {
390                 dma_addr_t addr;
391                 unsigned int *last_rx_bd = &priv->last_rx_bd;
392                 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
393                 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
394 
395                 rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
396                                                          EMAC_BUFFER_SIZE);
397                 if (unlikely(!rx_buff->skb))
398                         return -ENOMEM;
399 
400                 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
401                                       EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
402                 if (dma_mapping_error(&ndev->dev, addr)) {
403                         netdev_err(ndev, "cannot dma map\n");
404                         dev_kfree_skb(rx_buff->skb);
405                         return -ENOMEM;
406                 }
407                 dma_unmap_addr_set(rx_buff, addr, addr);
408                 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
409 
410                 rxbd->data = cpu_to_le32(addr);
411 
412                 /* Make sure pointer to data buffer is set */
413                 wmb();
414 
415                 /* Return ownership to EMAC */
416                 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
417 
418                 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
419         }
420 
421         /* Clean Tx BD's */
422         memset(priv->txbd, 0, TX_RING_SZ);
423 
424         /* Initialize logical address filter */
425         arc_reg_set(priv, R_LAFL, 0);
426         arc_reg_set(priv, R_LAFH, 0);
427 
428         /* Set BD ring pointers for device side */
429         arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma);
430         arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma);
431 
432         /* Enable interrupts */
433         arc_reg_set(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
434 
435         /* Set CONTROL */
436         arc_reg_set(priv, R_CTRL,
437                      (RX_BD_NUM << 24) |        /* RX BD table length */
438                      (TX_BD_NUM << 16) |        /* TX BD table length */
439                      TXRN_MASK | RXRN_MASK);
440 
441         napi_enable(&priv->napi);
442 
443         /* Enable EMAC */
444         arc_reg_or(priv, R_CTRL, EN_MASK);
445 
446         phy_start_aneg(priv->phy_dev);
447 
448         netif_start_queue(ndev);
449 
450         return 0;
451 }
452 
453 /**
454  * arc_emac_stop - Close the network device.
455  * @ndev:       Pointer to the network device.
456  *
457  * This function stops the Tx queue, disables interrupts and frees the IRQ for
458  * the EMAC device.
459  * It also disconnects the PHY device associated with the EMAC device.
460  */
461 static int arc_emac_stop(struct net_device *ndev)
462 {
463         struct arc_emac_priv *priv = netdev_priv(ndev);
464 
465         napi_disable(&priv->napi);
466         netif_stop_queue(ndev);
467 
468         /* Disable interrupts */
469         arc_reg_clr(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
470 
471         /* Disable EMAC */
472         arc_reg_clr(priv, R_CTRL, EN_MASK);
473 
474         return 0;
475 }
476 
477 /**
478  * arc_emac_stats - Get system network statistics.
479  * @ndev:       Pointer to net_device structure.
480  *
481  * Returns the address of the device statistics structure.
482  * Statistics are updated in interrupt handler.
483  */
484 static struct net_device_stats *arc_emac_stats(struct net_device *ndev)
485 {
486         struct arc_emac_priv *priv = netdev_priv(ndev);
487         struct net_device_stats *stats = &priv->stats;
488         unsigned long miss, rxerr;
489         u8 rxcrc, rxfram, rxoflow;
490 
491         rxerr = arc_reg_get(priv, R_RXERR);
492         miss = arc_reg_get(priv, R_MISS);
493 
494         rxcrc = rxerr;
495         rxfram = rxerr >> 8;
496         rxoflow = rxerr >> 16;
497 
498         stats->rx_errors += miss;
499         stats->rx_errors += rxcrc + rxfram + rxoflow;
500 
501         stats->rx_over_errors += rxoflow;
502         stats->rx_frame_errors += rxfram;
503         stats->rx_crc_errors += rxcrc;
504         stats->rx_missed_errors += miss;
505 
506         return stats;
507 }
508 
509 /**
510  * arc_emac_tx - Starts the data transmission.
511  * @skb:        sk_buff pointer that contains data to be Transmitted.
512  * @ndev:       Pointer to net_device structure.
513  *
514  * returns: NETDEV_TX_OK, on success
515  *              NETDEV_TX_BUSY, if any of the descriptors are not free.
516  *
517  * This function is invoked from upper layers to initiate transmission.
518  */
519 static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
520 {
521         struct arc_emac_priv *priv = netdev_priv(ndev);
522         unsigned int len, *txbd_curr = &priv->txbd_curr;
523         struct net_device_stats *stats = &priv->stats;
524         __le32 *info = &priv->txbd[*txbd_curr].info;
525         dma_addr_t addr;
526 
527         if (skb_padto(skb, ETH_ZLEN))
528                 return NETDEV_TX_OK;
529 
530         len = max_t(unsigned int, ETH_ZLEN, skb->len);
531 
532         /* EMAC still holds this buffer in its possession.
533          * CPU must not modify this buffer descriptor
534          */
535         if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) {
536                 netif_stop_queue(ndev);
537                 return NETDEV_TX_BUSY;
538         }
539 
540         addr = dma_map_single(&ndev->dev, (void *)skb->data, len,
541                               DMA_TO_DEVICE);
542 
543         if (unlikely(dma_mapping_error(&ndev->dev, addr))) {
544                 stats->tx_dropped++;
545                 stats->tx_errors++;
546                 dev_kfree_skb(skb);
547                 return NETDEV_TX_OK;
548         }
549         dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr);
550         dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len);
551 
552         priv->tx_buff[*txbd_curr].skb = skb;
553         priv->txbd[*txbd_curr].data = cpu_to_le32(addr);
554 
555         /* Make sure pointer to data buffer is set */
556         wmb();
557 
558         skb_tx_timestamp(skb);
559 
560         *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len);
561 
562         /* Increment index to point to the next BD */
563         *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM;
564 
565         /* Get "info" of the next BD */
566         info = &priv->txbd[*txbd_curr].info;
567 
568         /* Check if if Tx BD ring is full - next BD is still owned by EMAC */
569         if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC))
570                 netif_stop_queue(ndev);
571 
572         arc_reg_set(priv, R_STATUS, TXPL_MASK);
573 
574         return NETDEV_TX_OK;
575 }
576 
577 static void arc_emac_set_address_internal(struct net_device *ndev)
578 {
579         struct arc_emac_priv *priv = netdev_priv(ndev);
580         unsigned int addr_low, addr_hi;
581 
582         addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]);
583         addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]);
584 
585         arc_reg_set(priv, R_ADDRL, addr_low);
586         arc_reg_set(priv, R_ADDRH, addr_hi);
587 }
588 
589 /**
590  * arc_emac_set_address - Set the MAC address for this device.
591  * @ndev:       Pointer to net_device structure.
592  * @p:          6 byte Address to be written as MAC address.
593  *
594  * This function copies the HW address from the sockaddr structure to the
595  * net_device structure and updates the address in HW.
596  *
597  * returns:     -EBUSY if the net device is busy or 0 if the address is set
598  *              successfully.
599  */
600 static int arc_emac_set_address(struct net_device *ndev, void *p)
601 {
602         struct sockaddr *addr = p;
603 
604         if (netif_running(ndev))
605                 return -EBUSY;
606 
607         if (!is_valid_ether_addr(addr->sa_data))
608                 return -EADDRNOTAVAIL;
609 
610         memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
611 
612         arc_emac_set_address_internal(ndev);
613 
614         return 0;
615 }
616 
617 static const struct net_device_ops arc_emac_netdev_ops = {
618         .ndo_open               = arc_emac_open,
619         .ndo_stop               = arc_emac_stop,
620         .ndo_start_xmit         = arc_emac_tx,
621         .ndo_set_mac_address    = arc_emac_set_address,
622         .ndo_get_stats          = arc_emac_stats,
623 };
624 
625 static int arc_emac_probe(struct platform_device *pdev)
626 {
627         struct resource res_regs;
628         struct device_node *phy_node;
629         struct arc_emac_priv *priv;
630         struct net_device *ndev;
631         const char *mac_addr;
632         unsigned int id, clock_frequency, irq;
633         int err;
634 
635         if (!pdev->dev.of_node)
636                 return -ENODEV;
637 
638         /* Get PHY from device tree */
639         phy_node = of_parse_phandle(pdev->dev.of_node, "phy", 0);
640         if (!phy_node) {
641                 dev_err(&pdev->dev, "failed to retrieve phy description from device tree\n");
642                 return -ENODEV;
643         }
644 
645         /* Get EMAC registers base address from device tree */
646         err = of_address_to_resource(pdev->dev.of_node, 0, &res_regs);
647         if (err) {
648                 dev_err(&pdev->dev, "failed to retrieve registers base from device tree\n");
649                 return -ENODEV;
650         }
651 
652         /* Get IRQ from device tree */
653         irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
654         if (!irq) {
655                 dev_err(&pdev->dev, "failed to retrieve <irq> value from device tree\n");
656                 return -ENODEV;
657         }
658 
659         ndev = alloc_etherdev(sizeof(struct arc_emac_priv));
660         if (!ndev)
661                 return -ENOMEM;
662 
663         platform_set_drvdata(pdev, ndev);
664         SET_NETDEV_DEV(ndev, &pdev->dev);
665 
666         ndev->netdev_ops = &arc_emac_netdev_ops;
667         ndev->ethtool_ops = &arc_emac_ethtool_ops;
668         ndev->watchdog_timeo = TX_TIMEOUT;
669         /* FIXME :: no multicast support yet */
670         ndev->flags &= ~IFF_MULTICAST;
671 
672         priv = netdev_priv(ndev);
673         priv->dev = &pdev->dev;
674         priv->ndev = ndev;
675 
676         priv->regs = devm_ioremap_resource(&pdev->dev, &res_regs);
677         if (IS_ERR(priv->regs)) {
678                 err = PTR_ERR(priv->regs);
679                 goto out_netdev;
680         }
681         dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs);
682 
683         priv->clk = of_clk_get(pdev->dev.of_node, 0);
684         if (IS_ERR(priv->clk)) {
685                 /* Get CPU clock frequency from device tree */
686                 if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
687                                         &clock_frequency)) {
688                         dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n");
689                         err = -EINVAL;
690                         goto out_netdev;
691                 }
692         } else {
693                 err = clk_prepare_enable(priv->clk);
694                 if (err) {
695                         dev_err(&pdev->dev, "failed to enable clock\n");
696                         goto out_clkget;
697                 }
698 
699                 clock_frequency = clk_get_rate(priv->clk);
700         }
701 
702         id = arc_reg_get(priv, R_ID);
703 
704         /* Check for EMAC revision 5 or 7, magic number */
705         if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
706                 dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id);
707                 err = -ENODEV;
708                 goto out_clken;
709         }
710         dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id);
711 
712         /* Set poll rate so that it polls every 1 ms */
713         arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000);
714 
715         ndev->irq = irq;
716         dev_info(&pdev->dev, "IRQ is %d\n", ndev->irq);
717 
718         /* Register interrupt handler for device */
719         err = devm_request_irq(&pdev->dev, ndev->irq, arc_emac_intr, 0,
720                                ndev->name, ndev);
721         if (err) {
722                 dev_err(&pdev->dev, "could not allocate IRQ\n");
723                 goto out_clken;
724         }
725 
726         /* Get MAC address from device tree */
727         mac_addr = of_get_mac_address(pdev->dev.of_node);
728 
729         if (mac_addr)
730                 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
731         else
732                 eth_hw_addr_random(ndev);
733 
734         arc_emac_set_address_internal(ndev);
735         dev_info(&pdev->dev, "MAC address is now %pM\n", ndev->dev_addr);
736 
737         /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
738         priv->rxbd = dmam_alloc_coherent(&pdev->dev, RX_RING_SZ + TX_RING_SZ,
739                                          &priv->rxbd_dma, GFP_KERNEL);
740 
741         if (!priv->rxbd) {
742                 dev_err(&pdev->dev, "failed to allocate data buffers\n");
743                 err = -ENOMEM;
744                 goto out_clken;
745         }
746 
747         priv->txbd = priv->rxbd + RX_BD_NUM;
748 
749         priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ;
750         dev_dbg(&pdev->dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
751                 (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma);
752 
753         err = arc_mdio_probe(pdev, priv);
754         if (err) {
755                 dev_err(&pdev->dev, "failed to probe MII bus\n");
756                 goto out_clken;
757         }
758 
759         priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
760                                        PHY_INTERFACE_MODE_MII);
761         if (!priv->phy_dev) {
762                 dev_err(&pdev->dev, "of_phy_connect() failed\n");
763                 err = -ENODEV;
764                 goto out_mdio;
765         }
766 
767         dev_info(&pdev->dev, "connected to %s phy with id 0x%x\n",
768                  priv->phy_dev->drv->name, priv->phy_dev->phy_id);
769 
770         netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT);
771 
772         err = register_netdev(ndev);
773         if (err) {
774                 dev_err(&pdev->dev, "failed to register network device\n");
775                 goto out_netif_api;
776         }
777 
778         return 0;
779 
780 out_netif_api:
781         netif_napi_del(&priv->napi);
782         phy_disconnect(priv->phy_dev);
783         priv->phy_dev = NULL;
784 out_mdio:
785         arc_mdio_remove(priv);
786 out_clken:
787         if (!IS_ERR(priv->clk))
788                 clk_disable_unprepare(priv->clk);
789 out_clkget:
790         if (!IS_ERR(priv->clk))
791                 clk_put(priv->clk);
792 out_netdev:
793         free_netdev(ndev);
794         return err;
795 }
796 
797 static int arc_emac_remove(struct platform_device *pdev)
798 {
799         struct net_device *ndev = platform_get_drvdata(pdev);
800         struct arc_emac_priv *priv = netdev_priv(ndev);
801 
802         phy_disconnect(priv->phy_dev);
803         priv->phy_dev = NULL;
804         arc_mdio_remove(priv);
805         unregister_netdev(ndev);
806         netif_napi_del(&priv->napi);
807 
808         if (!IS_ERR(priv->clk)) {
809                 clk_disable_unprepare(priv->clk);
810                 clk_put(priv->clk);
811         }
812 
813         free_netdev(ndev);
814 
815         return 0;
816 }
817 
818 static const struct of_device_id arc_emac_dt_ids[] = {
819         { .compatible = "snps,arc-emac" },
820         { /* Sentinel */ }
821 };
822 MODULE_DEVICE_TABLE(of, arc_emac_dt_ids);
823 
824 static struct platform_driver arc_emac_driver = {
825         .probe = arc_emac_probe,
826         .remove = arc_emac_remove,
827         .driver = {
828                 .name = DRV_NAME,
829                 .owner = THIS_MODULE,
830                 .of_match_table  = arc_emac_dt_ids,
831                 },
832 };
833 
834 module_platform_driver(arc_emac_driver);
835 
836 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
837 MODULE_DESCRIPTION("ARC EMAC driver");
838 MODULE_LICENSE("GPL");
839 

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