2 * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
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.
8 * Driver for the ARC EMAC 10100 (hardware revision 5)
16 #include <linux/crc32.h>
17 #include <linux/etherdevice.h>
18 #include <linux/interrupt.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>
29 static void arc_emac_restart(struct net_device *ndev);
32 * arc_emac_tx_avail - Return the number of available slots in the tx ring.
33 * @priv: Pointer to ARC EMAC private data structure.
35 * returns: the number of slots available for transmission in tx the ring.
37 static inline int arc_emac_tx_avail(struct arc_emac_priv *priv)
39 return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM;
43 * arc_emac_adjust_link - Adjust the PHY link duplex.
44 * @ndev: Pointer to the net_device structure.
46 * This function is called to change the duplex setting after auto negotiation
49 static void arc_emac_adjust_link(struct net_device *ndev)
51 struct arc_emac_priv *priv = netdev_priv(ndev);
52 struct phy_device *phy_dev = ndev->phydev;
53 unsigned int reg, state_changed = 0;
55 if (priv->link != phy_dev->link) {
56 priv->link = phy_dev->link;
60 if (priv->speed != phy_dev->speed) {
61 priv->speed = phy_dev->speed;
63 if (priv->set_mac_speed)
64 priv->set_mac_speed(priv, priv->speed);
67 if (priv->duplex != phy_dev->duplex) {
68 reg = arc_reg_get(priv, R_CTRL);
70 if (phy_dev->duplex == DUPLEX_FULL)
75 arc_reg_set(priv, R_CTRL, reg);
76 priv->duplex = phy_dev->duplex;
81 phy_print_status(phy_dev);
85 * arc_emac_get_drvinfo - Get EMAC driver information.
86 * @ndev: Pointer to net_device structure.
87 * @info: Pointer to ethtool_drvinfo structure.
89 * This implements ethtool command for getting the driver information.
90 * Issue "ethtool -i ethX" under linux prompt to execute this function.
92 static void arc_emac_get_drvinfo(struct net_device *ndev,
93 struct ethtool_drvinfo *info)
95 struct arc_emac_priv *priv = netdev_priv(ndev);
97 strlcpy(info->driver, priv->drv_name, sizeof(info->driver));
98 strlcpy(info->version, priv->drv_version, sizeof(info->version));
101 static const struct ethtool_ops arc_emac_ethtool_ops = {
102 .get_drvinfo = arc_emac_get_drvinfo,
103 .get_link = ethtool_op_get_link,
104 .get_link_ksettings = phy_ethtool_get_link_ksettings,
105 .set_link_ksettings = phy_ethtool_set_link_ksettings,
108 #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK)
111 * arc_emac_tx_clean - clears processed by EMAC Tx BDs.
112 * @ndev: Pointer to the network device.
114 static void arc_emac_tx_clean(struct net_device *ndev)
116 struct arc_emac_priv *priv = netdev_priv(ndev);
117 struct net_device_stats *stats = &ndev->stats;
120 for (i = 0; i < TX_BD_NUM; i++) {
121 unsigned int *txbd_dirty = &priv->txbd_dirty;
122 struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty];
123 struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty];
124 struct sk_buff *skb = tx_buff->skb;
125 unsigned int info = le32_to_cpu(txbd->info);
127 if ((info & FOR_EMAC) || !txbd->data || !skb)
130 if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) {
135 stats->tx_carrier_errors++;
141 stats->tx_fifo_errors++;
142 } else if (likely(info & FIRST_OR_LAST_MASK)) {
144 stats->tx_bytes += skb->len;
147 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
148 dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
150 /* return the sk_buff to system */
151 dev_consume_skb_irq(skb);
157 *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
160 /* Ensure that txbd_dirty is visible to tx() before checking
165 if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv))
166 netif_wake_queue(ndev);
170 * arc_emac_rx - processing of Rx packets.
171 * @ndev: Pointer to the network device.
172 * @budget: How many BDs to process on 1 call.
174 * returns: Number of processed BDs
176 * Iterate through Rx BDs and deliver received packages to upper layer.
178 static int arc_emac_rx(struct net_device *ndev, int budget)
180 struct arc_emac_priv *priv = netdev_priv(ndev);
181 unsigned int work_done;
183 for (work_done = 0; work_done < budget; work_done++) {
184 unsigned int *last_rx_bd = &priv->last_rx_bd;
185 struct net_device_stats *stats = &ndev->stats;
186 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
187 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
188 unsigned int pktlen, info = le32_to_cpu(rxbd->info);
192 if (unlikely((info & OWN_MASK) == FOR_EMAC))
195 /* Make a note that we saw a packet at this BD.
196 * So next time, driver starts from this + 1
198 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
200 if (unlikely((info & FIRST_OR_LAST_MASK) !=
201 FIRST_OR_LAST_MASK)) {
202 /* We pre-allocate buffers of MTU size so incoming
203 * packets won't be split/chained.
206 netdev_err(ndev, "incomplete packet received\n");
208 /* Return ownership to EMAC */
209 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
211 stats->rx_length_errors++;
215 /* Prepare the BD for next cycle. netif_receive_skb()
216 * only if new skb was allocated and mapped to avoid holes
219 skb = netdev_alloc_skb_ip_align(ndev, EMAC_BUFFER_SIZE);
220 if (unlikely(!skb)) {
222 netdev_err(ndev, "cannot allocate skb\n");
223 /* Return ownership to EMAC */
224 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
230 addr = dma_map_single(&ndev->dev, (void *)skb->data,
231 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
232 if (dma_mapping_error(&ndev->dev, addr)) {
234 netdev_err(ndev, "cannot map dma buffer\n");
236 /* Return ownership to EMAC */
237 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
243 /* unmap previosly mapped skb */
244 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
245 dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
247 pktlen = info & LEN_MASK;
249 stats->rx_bytes += pktlen;
250 skb_put(rx_buff->skb, pktlen);
251 rx_buff->skb->dev = ndev;
252 rx_buff->skb->protocol = eth_type_trans(rx_buff->skb, ndev);
254 netif_receive_skb(rx_buff->skb);
257 dma_unmap_addr_set(rx_buff, addr, addr);
258 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
260 rxbd->data = cpu_to_le32(addr);
262 /* Make sure pointer to data buffer is set */
265 /* Return ownership to EMAC */
266 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
273 * arc_emac_rx_miss_handle - handle R_MISS register
274 * @ndev: Pointer to the net_device structure.
276 static void arc_emac_rx_miss_handle(struct net_device *ndev)
278 struct arc_emac_priv *priv = netdev_priv(ndev);
279 struct net_device_stats *stats = &ndev->stats;
282 miss = arc_reg_get(priv, R_MISS);
284 stats->rx_errors += miss;
285 stats->rx_missed_errors += miss;
286 priv->rx_missed_errors += miss;
291 * arc_emac_rx_stall_check - check RX stall
292 * @ndev: Pointer to the net_device structure.
293 * @budget: How many BDs requested to process on 1 call.
294 * @work_done: How many BDs processed
296 * Under certain conditions EMAC stop reception of incoming packets and
297 * continuously increment R_MISS register instead of saving data into
298 * provided buffer. This function detect that condition and restart
301 static void arc_emac_rx_stall_check(struct net_device *ndev,
302 int budget, unsigned int work_done)
304 struct arc_emac_priv *priv = netdev_priv(ndev);
305 struct arc_emac_bd *rxbd;
308 priv->rx_missed_errors = 0;
310 if (priv->rx_missed_errors && budget) {
311 rxbd = &priv->rxbd[priv->last_rx_bd];
312 if (le32_to_cpu(rxbd->info) & FOR_EMAC) {
313 arc_emac_restart(ndev);
314 priv->rx_missed_errors = 0;
320 * arc_emac_poll - NAPI poll handler.
321 * @napi: Pointer to napi_struct structure.
322 * @budget: How many BDs to process on 1 call.
324 * returns: Number of processed BDs
326 static int arc_emac_poll(struct napi_struct *napi, int budget)
328 struct net_device *ndev = napi->dev;
329 struct arc_emac_priv *priv = netdev_priv(ndev);
330 unsigned int work_done;
332 arc_emac_tx_clean(ndev);
333 arc_emac_rx_miss_handle(ndev);
335 work_done = arc_emac_rx(ndev, budget);
336 if (work_done < budget) {
337 napi_complete_done(napi, work_done);
338 arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
341 arc_emac_rx_stall_check(ndev, budget, work_done);
347 * arc_emac_intr - Global interrupt handler for EMAC.
349 * @dev_instance: device instance.
351 * returns: IRQ_HANDLED for all cases.
353 * ARC EMAC has only 1 interrupt line, and depending on bits raised in
354 * STATUS register we may tell what is a reason for interrupt to fire.
356 static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
358 struct net_device *ndev = dev_instance;
359 struct arc_emac_priv *priv = netdev_priv(ndev);
360 struct net_device_stats *stats = &ndev->stats;
363 status = arc_reg_get(priv, R_STATUS);
364 status &= ~MDIO_MASK;
366 /* Reset all flags except "MDIO complete" */
367 arc_reg_set(priv, R_STATUS, status);
369 if (status & (RXINT_MASK | TXINT_MASK)) {
370 if (likely(napi_schedule_prep(&priv->napi))) {
371 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
372 __napi_schedule(&priv->napi);
376 if (status & ERR_MASK) {
377 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
378 * 8-bit error counter overrun.
381 if (status & MSER_MASK) {
382 stats->rx_missed_errors += 0x100;
383 stats->rx_errors += 0x100;
384 priv->rx_missed_errors += 0x100;
385 napi_schedule(&priv->napi);
388 if (status & RXCR_MASK) {
389 stats->rx_crc_errors += 0x100;
390 stats->rx_errors += 0x100;
393 if (status & RXFR_MASK) {
394 stats->rx_frame_errors += 0x100;
395 stats->rx_errors += 0x100;
398 if (status & RXFL_MASK) {
399 stats->rx_over_errors += 0x100;
400 stats->rx_errors += 0x100;
407 #ifdef CONFIG_NET_POLL_CONTROLLER
408 static void arc_emac_poll_controller(struct net_device *dev)
410 disable_irq(dev->irq);
411 arc_emac_intr(dev->irq, dev);
412 enable_irq(dev->irq);
417 * arc_emac_open - Open the network device.
418 * @ndev: Pointer to the network device.
420 * returns: 0, on success or non-zero error value on failure.
422 * This function sets the MAC address, requests and enables an IRQ
423 * for the EMAC device and starts the Tx queue.
424 * It also connects to the phy device.
426 static int arc_emac_open(struct net_device *ndev)
428 struct arc_emac_priv *priv = netdev_priv(ndev);
429 struct phy_device *phy_dev = ndev->phydev;
432 phy_dev->autoneg = AUTONEG_ENABLE;
435 linkmode_and(phy_dev->advertising, phy_dev->advertising,
438 priv->last_rx_bd = 0;
440 /* Allocate and set buffers for Rx BD's */
441 for (i = 0; i < RX_BD_NUM; i++) {
443 unsigned int *last_rx_bd = &priv->last_rx_bd;
444 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
445 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
447 rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
449 if (unlikely(!rx_buff->skb))
452 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
453 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
454 if (dma_mapping_error(&ndev->dev, addr)) {
455 netdev_err(ndev, "cannot dma map\n");
456 dev_kfree_skb(rx_buff->skb);
459 dma_unmap_addr_set(rx_buff, addr, addr);
460 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
462 rxbd->data = cpu_to_le32(addr);
464 /* Make sure pointer to data buffer is set */
467 /* Return ownership to EMAC */
468 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
470 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
474 priv->txbd_dirty = 0;
477 memset(priv->txbd, 0, TX_RING_SZ);
479 /* Initialize logical address filter */
480 arc_reg_set(priv, R_LAFL, 0);
481 arc_reg_set(priv, R_LAFH, 0);
483 /* Set BD ring pointers for device side */
484 arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma);
485 arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma);
487 /* Enable interrupts */
488 arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
491 arc_reg_set(priv, R_CTRL,
492 (RX_BD_NUM << 24) | /* RX BD table length */
493 (TX_BD_NUM << 16) | /* TX BD table length */
494 TXRN_MASK | RXRN_MASK);
496 napi_enable(&priv->napi);
499 arc_reg_or(priv, R_CTRL, EN_MASK);
501 phy_start(ndev->phydev);
503 netif_start_queue(ndev);
509 * arc_emac_set_rx_mode - Change the receive filtering mode.
510 * @ndev: Pointer to the network device.
512 * This function enables/disables promiscuous or all-multicast mode
513 * and updates the multicast filtering list of the network device.
515 static void arc_emac_set_rx_mode(struct net_device *ndev)
517 struct arc_emac_priv *priv = netdev_priv(ndev);
519 if (ndev->flags & IFF_PROMISC) {
520 arc_reg_or(priv, R_CTRL, PROM_MASK);
522 arc_reg_clr(priv, R_CTRL, PROM_MASK);
524 if (ndev->flags & IFF_ALLMULTI) {
525 arc_reg_set(priv, R_LAFL, ~0);
526 arc_reg_set(priv, R_LAFH, ~0);
527 } else if (ndev->flags & IFF_MULTICAST) {
528 struct netdev_hw_addr *ha;
529 unsigned int filter[2] = { 0, 0 };
532 netdev_for_each_mc_addr(ha, ndev) {
533 bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26;
534 filter[bit >> 5] |= 1 << (bit & 31);
537 arc_reg_set(priv, R_LAFL, filter[0]);
538 arc_reg_set(priv, R_LAFH, filter[1]);
540 arc_reg_set(priv, R_LAFL, 0);
541 arc_reg_set(priv, R_LAFH, 0);
547 * arc_free_tx_queue - free skb from tx queue
548 * @ndev: Pointer to the network device.
550 * This function must be called while EMAC disable
552 static void arc_free_tx_queue(struct net_device *ndev)
554 struct arc_emac_priv *priv = netdev_priv(ndev);
557 for (i = 0; i < TX_BD_NUM; i++) {
558 struct arc_emac_bd *txbd = &priv->txbd[i];
559 struct buffer_state *tx_buff = &priv->tx_buff[i];
562 dma_unmap_single(&ndev->dev,
563 dma_unmap_addr(tx_buff, addr),
564 dma_unmap_len(tx_buff, len),
567 /* return the sk_buff to system */
568 dev_kfree_skb_irq(tx_buff->skb);
578 * arc_free_rx_queue - free skb from rx queue
579 * @ndev: Pointer to the network device.
581 * This function must be called while EMAC disable
583 static void arc_free_rx_queue(struct net_device *ndev)
585 struct arc_emac_priv *priv = netdev_priv(ndev);
588 for (i = 0; i < RX_BD_NUM; i++) {
589 struct arc_emac_bd *rxbd = &priv->rxbd[i];
590 struct buffer_state *rx_buff = &priv->rx_buff[i];
593 dma_unmap_single(&ndev->dev,
594 dma_unmap_addr(rx_buff, addr),
595 dma_unmap_len(rx_buff, len),
598 /* return the sk_buff to system */
599 dev_kfree_skb_irq(rx_buff->skb);
609 * arc_emac_stop - Close the network device.
610 * @ndev: Pointer to the network device.
612 * This function stops the Tx queue, disables interrupts and frees the IRQ for
614 * It also disconnects the PHY device associated with the EMAC device.
616 static int arc_emac_stop(struct net_device *ndev)
618 struct arc_emac_priv *priv = netdev_priv(ndev);
620 napi_disable(&priv->napi);
621 netif_stop_queue(ndev);
623 phy_stop(ndev->phydev);
625 /* Disable interrupts */
626 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
629 arc_reg_clr(priv, R_CTRL, EN_MASK);
631 /* Return the sk_buff to system */
632 arc_free_tx_queue(ndev);
633 arc_free_rx_queue(ndev);
639 * arc_emac_stats - Get system network statistics.
640 * @ndev: Pointer to net_device structure.
642 * Returns the address of the device statistics structure.
643 * Statistics are updated in interrupt handler.
645 static struct net_device_stats *arc_emac_stats(struct net_device *ndev)
647 struct arc_emac_priv *priv = netdev_priv(ndev);
648 struct net_device_stats *stats = &ndev->stats;
649 unsigned long miss, rxerr;
650 u8 rxcrc, rxfram, rxoflow;
652 rxerr = arc_reg_get(priv, R_RXERR);
653 miss = arc_reg_get(priv, R_MISS);
657 rxoflow = rxerr >> 16;
659 stats->rx_errors += miss;
660 stats->rx_errors += rxcrc + rxfram + rxoflow;
662 stats->rx_over_errors += rxoflow;
663 stats->rx_frame_errors += rxfram;
664 stats->rx_crc_errors += rxcrc;
665 stats->rx_missed_errors += miss;
671 * arc_emac_tx - Starts the data transmission.
672 * @skb: sk_buff pointer that contains data to be Transmitted.
673 * @ndev: Pointer to net_device structure.
675 * returns: NETDEV_TX_OK, on success
676 * NETDEV_TX_BUSY, if any of the descriptors are not free.
678 * This function is invoked from upper layers to initiate transmission.
680 static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
682 struct arc_emac_priv *priv = netdev_priv(ndev);
683 unsigned int len, *txbd_curr = &priv->txbd_curr;
684 struct net_device_stats *stats = &ndev->stats;
685 __le32 *info = &priv->txbd[*txbd_curr].info;
688 if (skb_padto(skb, ETH_ZLEN))
691 len = max_t(unsigned int, ETH_ZLEN, skb->len);
693 if (unlikely(!arc_emac_tx_avail(priv))) {
694 netif_stop_queue(ndev);
695 netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n");
696 return NETDEV_TX_BUSY;
699 addr = dma_map_single(&ndev->dev, (void *)skb->data, len,
702 if (unlikely(dma_mapping_error(&ndev->dev, addr))) {
705 dev_kfree_skb_any(skb);
708 dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr);
709 dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len);
711 priv->txbd[*txbd_curr].data = cpu_to_le32(addr);
713 /* Make sure pointer to data buffer is set */
716 skb_tx_timestamp(skb);
718 *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len);
720 /* Make sure info word is set */
723 priv->tx_buff[*txbd_curr].skb = skb;
725 /* Increment index to point to the next BD */
726 *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM;
728 /* Ensure that tx_clean() sees the new txbd_curr before
729 * checking the queue status. This prevents an unneeded wake
730 * of the queue in tx_clean().
734 if (!arc_emac_tx_avail(priv)) {
735 netif_stop_queue(ndev);
736 /* Refresh tx_dirty */
738 if (arc_emac_tx_avail(priv))
739 netif_start_queue(ndev);
742 arc_reg_set(priv, R_STATUS, TXPL_MASK);
747 static void arc_emac_set_address_internal(struct net_device *ndev)
749 struct arc_emac_priv *priv = netdev_priv(ndev);
750 unsigned int addr_low, addr_hi;
752 addr_low = le32_to_cpu(*(__le32 *)&ndev->dev_addr[0]);
753 addr_hi = le16_to_cpu(*(__le16 *)&ndev->dev_addr[4]);
755 arc_reg_set(priv, R_ADDRL, addr_low);
756 arc_reg_set(priv, R_ADDRH, addr_hi);
760 * arc_emac_set_address - Set the MAC address for this device.
761 * @ndev: Pointer to net_device structure.
762 * @p: 6 byte Address to be written as MAC address.
764 * This function copies the HW address from the sockaddr structure to the
765 * net_device structure and updates the address in HW.
767 * returns: -EBUSY if the net device is busy or 0 if the address is set
770 static int arc_emac_set_address(struct net_device *ndev, void *p)
772 struct sockaddr *addr = p;
774 if (netif_running(ndev))
777 if (!is_valid_ether_addr(addr->sa_data))
778 return -EADDRNOTAVAIL;
780 memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
782 arc_emac_set_address_internal(ndev);
787 static int arc_emac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
789 if (!netif_running(dev))
795 return phy_mii_ioctl(dev->phydev, rq, cmd);
800 * arc_emac_restart - Restart EMAC
801 * @ndev: Pointer to net_device structure.
803 * This function do hardware reset of EMAC in order to restore
804 * network packets reception.
806 static void arc_emac_restart(struct net_device *ndev)
808 struct arc_emac_priv *priv = netdev_priv(ndev);
809 struct net_device_stats *stats = &ndev->stats;
813 netdev_warn(ndev, "restarting stalled EMAC\n");
815 netif_stop_queue(ndev);
817 /* Disable interrupts */
818 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
821 arc_reg_clr(priv, R_CTRL, EN_MASK);
823 /* Return the sk_buff to system */
824 arc_free_tx_queue(ndev);
828 priv->txbd_dirty = 0;
829 memset(priv->txbd, 0, TX_RING_SZ);
831 for (i = 0; i < RX_BD_NUM; i++) {
832 struct arc_emac_bd *rxbd = &priv->rxbd[i];
833 unsigned int info = le32_to_cpu(rxbd->info);
835 if (!(info & FOR_EMAC)) {
839 /* Return ownership to EMAC */
840 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
842 priv->last_rx_bd = 0;
844 /* Make sure info is visible to EMAC before enable */
847 /* Enable interrupts */
848 arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
851 arc_reg_or(priv, R_CTRL, EN_MASK);
853 netif_start_queue(ndev);
856 static const struct net_device_ops arc_emac_netdev_ops = {
857 .ndo_open = arc_emac_open,
858 .ndo_stop = arc_emac_stop,
859 .ndo_start_xmit = arc_emac_tx,
860 .ndo_set_mac_address = arc_emac_set_address,
861 .ndo_get_stats = arc_emac_stats,
862 .ndo_set_rx_mode = arc_emac_set_rx_mode,
863 .ndo_do_ioctl = arc_emac_ioctl,
864 #ifdef CONFIG_NET_POLL_CONTROLLER
865 .ndo_poll_controller = arc_emac_poll_controller,
869 int arc_emac_probe(struct net_device *ndev, int interface)
871 struct device *dev = ndev->dev.parent;
872 struct resource res_regs;
873 struct device_node *phy_node;
874 struct phy_device *phydev = NULL;
875 struct arc_emac_priv *priv;
876 const char *mac_addr;
877 unsigned int id, clock_frequency, irq;
880 /* Get PHY from device tree */
881 phy_node = of_parse_phandle(dev->of_node, "phy", 0);
883 dev_err(dev, "failed to retrieve phy description from device tree\n");
887 /* Get EMAC registers base address from device tree */
888 err = of_address_to_resource(dev->of_node, 0, &res_regs);
890 dev_err(dev, "failed to retrieve registers base from device tree\n");
895 /* Get IRQ from device tree */
896 irq = irq_of_parse_and_map(dev->of_node, 0);
898 dev_err(dev, "failed to retrieve <irq> value from device tree\n");
903 ndev->netdev_ops = &arc_emac_netdev_ops;
904 ndev->ethtool_ops = &arc_emac_ethtool_ops;
905 ndev->watchdog_timeo = TX_TIMEOUT;
907 priv = netdev_priv(ndev);
910 priv->regs = devm_ioremap_resource(dev, &res_regs);
911 if (IS_ERR(priv->regs)) {
912 err = PTR_ERR(priv->regs);
916 dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs);
919 err = clk_prepare_enable(priv->clk);
921 dev_err(dev, "failed to enable clock\n");
925 clock_frequency = clk_get_rate(priv->clk);
927 /* Get CPU clock frequency from device tree */
928 if (of_property_read_u32(dev->of_node, "clock-frequency",
930 dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n");
936 id = arc_reg_get(priv, R_ID);
938 /* Check for EMAC revision 5 or 7, magic number */
939 if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
940 dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id);
944 dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id);
946 /* Set poll rate so that it polls every 1 ms */
947 arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000);
950 dev_info(dev, "IRQ is %d\n", ndev->irq);
952 /* Register interrupt handler for device */
953 err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0,
956 dev_err(dev, "could not allocate IRQ\n");
960 /* Get MAC address from device tree */
961 mac_addr = of_get_mac_address(dev->of_node);
964 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
966 eth_hw_addr_random(ndev);
968 arc_emac_set_address_internal(ndev);
969 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
971 /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
972 priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ,
973 &priv->rxbd_dma, GFP_KERNEL);
976 dev_err(dev, "failed to allocate data buffers\n");
981 priv->txbd = priv->rxbd + RX_BD_NUM;
983 priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ;
984 dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
985 (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma);
987 err = arc_mdio_probe(priv);
989 dev_err(dev, "failed to probe MII bus\n");
993 phydev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
996 dev_err(dev, "of_phy_connect() failed\n");
1001 dev_info(dev, "connected to %s phy with id 0x%x\n",
1002 phydev->drv->name, phydev->phy_id);
1004 netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT);
1006 err = register_netdev(ndev);
1008 dev_err(dev, "failed to register network device\n");
1012 of_node_put(phy_node);
1016 netif_napi_del(&priv->napi);
1017 phy_disconnect(phydev);
1019 arc_mdio_remove(priv);
1022 clk_disable_unprepare(priv->clk);
1024 of_node_put(phy_node);
1028 EXPORT_SYMBOL_GPL(arc_emac_probe);
1030 int arc_emac_remove(struct net_device *ndev)
1032 struct arc_emac_priv *priv = netdev_priv(ndev);
1034 phy_disconnect(ndev->phydev);
1035 arc_mdio_remove(priv);
1036 unregister_netdev(ndev);
1037 netif_napi_del(&priv->napi);
1039 if (!IS_ERR(priv->clk))
1040 clk_disable_unprepare(priv->clk);
1044 EXPORT_SYMBOL_GPL(arc_emac_remove);
1046 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
1047 MODULE_DESCRIPTION("ARC EMAC driver");
1048 MODULE_LICENSE("GPL");