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>
30 * arc_emac_tx_avail - Return the number of available slots in the tx ring.
31 * @priv: Pointer to ARC EMAC private data structure.
33 * returns: the number of slots available for transmission in tx the ring.
35 static inline int arc_emac_tx_avail(struct arc_emac_priv *priv)
37 return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM;
41 * arc_emac_adjust_link - Adjust the PHY link duplex.
42 * @ndev: Pointer to the net_device structure.
44 * This function is called to change the duplex setting after auto negotiation
47 static void arc_emac_adjust_link(struct net_device *ndev)
49 struct arc_emac_priv *priv = netdev_priv(ndev);
50 struct phy_device *phy_dev = ndev->phydev;
51 unsigned int reg, state_changed = 0;
53 if (priv->link != phy_dev->link) {
54 priv->link = phy_dev->link;
58 if (priv->speed != phy_dev->speed) {
59 priv->speed = phy_dev->speed;
61 if (priv->set_mac_speed)
62 priv->set_mac_speed(priv, priv->speed);
65 if (priv->duplex != phy_dev->duplex) {
66 reg = arc_reg_get(priv, R_CTRL);
68 if (phy_dev->duplex == DUPLEX_FULL)
73 arc_reg_set(priv, R_CTRL, reg);
74 priv->duplex = phy_dev->duplex;
79 phy_print_status(phy_dev);
83 * arc_emac_get_drvinfo - Get EMAC driver information.
84 * @ndev: Pointer to net_device structure.
85 * @info: Pointer to ethtool_drvinfo structure.
87 * This implements ethtool command for getting the driver information.
88 * Issue "ethtool -i ethX" under linux prompt to execute this function.
90 static void arc_emac_get_drvinfo(struct net_device *ndev,
91 struct ethtool_drvinfo *info)
93 struct arc_emac_priv *priv = netdev_priv(ndev);
95 strlcpy(info->driver, priv->drv_name, sizeof(info->driver));
96 strlcpy(info->version, priv->drv_version, sizeof(info->version));
99 static const struct ethtool_ops arc_emac_ethtool_ops = {
100 .get_drvinfo = arc_emac_get_drvinfo,
101 .get_link = ethtool_op_get_link,
102 .get_link_ksettings = phy_ethtool_get_link_ksettings,
103 .set_link_ksettings = phy_ethtool_set_link_ksettings,
106 #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK)
109 * arc_emac_tx_clean - clears processed by EMAC Tx BDs.
110 * @ndev: Pointer to the network device.
112 static void arc_emac_tx_clean(struct net_device *ndev)
114 struct arc_emac_priv *priv = netdev_priv(ndev);
115 struct net_device_stats *stats = &ndev->stats;
118 for (i = 0; i < TX_BD_NUM; i++) {
119 unsigned int *txbd_dirty = &priv->txbd_dirty;
120 struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty];
121 struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty];
122 struct sk_buff *skb = tx_buff->skb;
123 unsigned int info = le32_to_cpu(txbd->info);
125 if ((info & FOR_EMAC) || !txbd->data || !skb)
128 if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) {
133 stats->tx_carrier_errors++;
139 stats->tx_fifo_errors++;
140 } else if (likely(info & FIRST_OR_LAST_MASK)) {
142 stats->tx_bytes += skb->len;
145 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
146 dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
148 /* return the sk_buff to system */
149 dev_kfree_skb_irq(skb);
155 *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
158 /* Ensure that txbd_dirty is visible to tx() before checking
163 if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv))
164 netif_wake_queue(ndev);
168 * arc_emac_rx - processing of Rx packets.
169 * @ndev: Pointer to the network device.
170 * @budget: How many BDs to process on 1 call.
172 * returns: Number of processed BDs
174 * Iterate through Rx BDs and deliver received packages to upper layer.
176 static int arc_emac_rx(struct net_device *ndev, int budget)
178 struct arc_emac_priv *priv = netdev_priv(ndev);
179 unsigned int work_done;
181 for (work_done = 0; work_done < budget; work_done++) {
182 unsigned int *last_rx_bd = &priv->last_rx_bd;
183 struct net_device_stats *stats = &ndev->stats;
184 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
185 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
186 unsigned int pktlen, info = le32_to_cpu(rxbd->info);
190 if (unlikely((info & OWN_MASK) == FOR_EMAC))
193 /* Make a note that we saw a packet at this BD.
194 * So next time, driver starts from this + 1
196 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
198 if (unlikely((info & FIRST_OR_LAST_MASK) !=
199 FIRST_OR_LAST_MASK)) {
200 /* We pre-allocate buffers of MTU size so incoming
201 * packets won't be split/chained.
204 netdev_err(ndev, "incomplete packet received\n");
206 /* Return ownership to EMAC */
207 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
209 stats->rx_length_errors++;
213 /* Prepare the BD for next cycle. netif_receive_skb()
214 * only if new skb was allocated and mapped to avoid holes
217 skb = netdev_alloc_skb_ip_align(ndev, EMAC_BUFFER_SIZE);
218 if (unlikely(!skb)) {
220 netdev_err(ndev, "cannot allocate skb\n");
221 /* Return ownership to EMAC */
222 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
228 addr = dma_map_single(&ndev->dev, (void *)skb->data,
229 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
230 if (dma_mapping_error(&ndev->dev, addr)) {
232 netdev_err(ndev, "cannot map dma buffer\n");
234 /* Return ownership to EMAC */
235 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
241 /* unmap previosly mapped skb */
242 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
243 dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
245 pktlen = info & LEN_MASK;
247 stats->rx_bytes += pktlen;
248 skb_put(rx_buff->skb, pktlen);
249 rx_buff->skb->dev = ndev;
250 rx_buff->skb->protocol = eth_type_trans(rx_buff->skb, ndev);
252 netif_receive_skb(rx_buff->skb);
255 dma_unmap_addr_set(rx_buff, addr, addr);
256 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
258 rxbd->data = cpu_to_le32(addr);
260 /* Make sure pointer to data buffer is set */
263 /* Return ownership to EMAC */
264 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
271 * arc_emac_poll - NAPI poll handler.
272 * @napi: Pointer to napi_struct structure.
273 * @budget: How many BDs to process on 1 call.
275 * returns: Number of processed BDs
277 static int arc_emac_poll(struct napi_struct *napi, int budget)
279 struct net_device *ndev = napi->dev;
280 struct arc_emac_priv *priv = netdev_priv(ndev);
281 unsigned int work_done;
283 arc_emac_tx_clean(ndev);
285 work_done = arc_emac_rx(ndev, budget);
286 if (work_done < budget) {
287 napi_complete_done(napi, work_done);
288 arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
295 * arc_emac_intr - Global interrupt handler for EMAC.
297 * @dev_instance: device instance.
299 * returns: IRQ_HANDLED for all cases.
301 * ARC EMAC has only 1 interrupt line, and depending on bits raised in
302 * STATUS register we may tell what is a reason for interrupt to fire.
304 static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
306 struct net_device *ndev = dev_instance;
307 struct arc_emac_priv *priv = netdev_priv(ndev);
308 struct net_device_stats *stats = &ndev->stats;
311 status = arc_reg_get(priv, R_STATUS);
312 status &= ~MDIO_MASK;
314 /* Reset all flags except "MDIO complete" */
315 arc_reg_set(priv, R_STATUS, status);
317 if (status & (RXINT_MASK | TXINT_MASK)) {
318 if (likely(napi_schedule_prep(&priv->napi))) {
319 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
320 __napi_schedule(&priv->napi);
324 if (status & ERR_MASK) {
325 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
326 * 8-bit error counter overrun.
329 if (status & MSER_MASK) {
330 stats->rx_missed_errors += 0x100;
331 stats->rx_errors += 0x100;
334 if (status & RXCR_MASK) {
335 stats->rx_crc_errors += 0x100;
336 stats->rx_errors += 0x100;
339 if (status & RXFR_MASK) {
340 stats->rx_frame_errors += 0x100;
341 stats->rx_errors += 0x100;
344 if (status & RXFL_MASK) {
345 stats->rx_over_errors += 0x100;
346 stats->rx_errors += 0x100;
353 #ifdef CONFIG_NET_POLL_CONTROLLER
354 static void arc_emac_poll_controller(struct net_device *dev)
356 disable_irq(dev->irq);
357 arc_emac_intr(dev->irq, dev);
358 enable_irq(dev->irq);
363 * arc_emac_open - Open the network device.
364 * @ndev: Pointer to the network device.
366 * returns: 0, on success or non-zero error value on failure.
368 * This function sets the MAC address, requests and enables an IRQ
369 * for the EMAC device and starts the Tx queue.
370 * It also connects to the phy device.
372 static int arc_emac_open(struct net_device *ndev)
374 struct arc_emac_priv *priv = netdev_priv(ndev);
375 struct phy_device *phy_dev = ndev->phydev;
378 phy_dev->autoneg = AUTONEG_ENABLE;
381 phy_dev->advertising &= phy_dev->supported;
383 priv->last_rx_bd = 0;
385 /* Allocate and set buffers for Rx BD's */
386 for (i = 0; i < RX_BD_NUM; i++) {
388 unsigned int *last_rx_bd = &priv->last_rx_bd;
389 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
390 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
392 rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
394 if (unlikely(!rx_buff->skb))
397 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
398 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
399 if (dma_mapping_error(&ndev->dev, addr)) {
400 netdev_err(ndev, "cannot dma map\n");
401 dev_kfree_skb(rx_buff->skb);
404 dma_unmap_addr_set(rx_buff, addr, addr);
405 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
407 rxbd->data = cpu_to_le32(addr);
409 /* Make sure pointer to data buffer is set */
412 /* Return ownership to EMAC */
413 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
415 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
419 priv->txbd_dirty = 0;
422 memset(priv->txbd, 0, TX_RING_SZ);
424 /* Initialize logical address filter */
425 arc_reg_set(priv, R_LAFL, 0);
426 arc_reg_set(priv, R_LAFH, 0);
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);
432 /* Enable interrupts */
433 arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
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);
441 napi_enable(&priv->napi);
444 arc_reg_or(priv, R_CTRL, EN_MASK);
446 phy_start(ndev->phydev);
448 netif_start_queue(ndev);
454 * arc_emac_set_rx_mode - Change the receive filtering mode.
455 * @ndev: Pointer to the network device.
457 * This function enables/disables promiscuous or all-multicast mode
458 * and updates the multicast filtering list of the network device.
460 static void arc_emac_set_rx_mode(struct net_device *ndev)
462 struct arc_emac_priv *priv = netdev_priv(ndev);
464 if (ndev->flags & IFF_PROMISC) {
465 arc_reg_or(priv, R_CTRL, PROM_MASK);
467 arc_reg_clr(priv, R_CTRL, PROM_MASK);
469 if (ndev->flags & IFF_ALLMULTI) {
470 arc_reg_set(priv, R_LAFL, ~0);
471 arc_reg_set(priv, R_LAFH, ~0);
472 } else if (ndev->flags & IFF_MULTICAST) {
473 struct netdev_hw_addr *ha;
474 unsigned int filter[2] = { 0, 0 };
477 netdev_for_each_mc_addr(ha, ndev) {
478 bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26;
479 filter[bit >> 5] |= 1 << (bit & 31);
482 arc_reg_set(priv, R_LAFL, filter[0]);
483 arc_reg_set(priv, R_LAFH, filter[1]);
485 arc_reg_set(priv, R_LAFL, 0);
486 arc_reg_set(priv, R_LAFH, 0);
492 * arc_free_tx_queue - free skb from tx queue
493 * @ndev: Pointer to the network device.
495 * This function must be called while EMAC disable
497 static void arc_free_tx_queue(struct net_device *ndev)
499 struct arc_emac_priv *priv = netdev_priv(ndev);
502 for (i = 0; i < TX_BD_NUM; i++) {
503 struct arc_emac_bd *txbd = &priv->txbd[i];
504 struct buffer_state *tx_buff = &priv->tx_buff[i];
507 dma_unmap_single(&ndev->dev,
508 dma_unmap_addr(tx_buff, addr),
509 dma_unmap_len(tx_buff, len),
512 /* return the sk_buff to system */
513 dev_kfree_skb_irq(tx_buff->skb);
523 * arc_free_rx_queue - free skb from rx queue
524 * @ndev: Pointer to the network device.
526 * This function must be called while EMAC disable
528 static void arc_free_rx_queue(struct net_device *ndev)
530 struct arc_emac_priv *priv = netdev_priv(ndev);
533 for (i = 0; i < RX_BD_NUM; i++) {
534 struct arc_emac_bd *rxbd = &priv->rxbd[i];
535 struct buffer_state *rx_buff = &priv->rx_buff[i];
538 dma_unmap_single(&ndev->dev,
539 dma_unmap_addr(rx_buff, addr),
540 dma_unmap_len(rx_buff, len),
543 /* return the sk_buff to system */
544 dev_kfree_skb_irq(rx_buff->skb);
554 * arc_emac_stop - Close the network device.
555 * @ndev: Pointer to the network device.
557 * This function stops the Tx queue, disables interrupts and frees the IRQ for
559 * It also disconnects the PHY device associated with the EMAC device.
561 static int arc_emac_stop(struct net_device *ndev)
563 struct arc_emac_priv *priv = netdev_priv(ndev);
565 napi_disable(&priv->napi);
566 netif_stop_queue(ndev);
568 phy_stop(ndev->phydev);
570 /* Disable interrupts */
571 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
574 arc_reg_clr(priv, R_CTRL, EN_MASK);
576 /* Return the sk_buff to system */
577 arc_free_tx_queue(ndev);
578 arc_free_rx_queue(ndev);
584 * arc_emac_stats - Get system network statistics.
585 * @ndev: Pointer to net_device structure.
587 * Returns the address of the device statistics structure.
588 * Statistics are updated in interrupt handler.
590 static struct net_device_stats *arc_emac_stats(struct net_device *ndev)
592 struct arc_emac_priv *priv = netdev_priv(ndev);
593 struct net_device_stats *stats = &ndev->stats;
594 unsigned long miss, rxerr;
595 u8 rxcrc, rxfram, rxoflow;
597 rxerr = arc_reg_get(priv, R_RXERR);
598 miss = arc_reg_get(priv, R_MISS);
602 rxoflow = rxerr >> 16;
604 stats->rx_errors += miss;
605 stats->rx_errors += rxcrc + rxfram + rxoflow;
607 stats->rx_over_errors += rxoflow;
608 stats->rx_frame_errors += rxfram;
609 stats->rx_crc_errors += rxcrc;
610 stats->rx_missed_errors += miss;
616 * arc_emac_tx - Starts the data transmission.
617 * @skb: sk_buff pointer that contains data to be Transmitted.
618 * @ndev: Pointer to net_device structure.
620 * returns: NETDEV_TX_OK, on success
621 * NETDEV_TX_BUSY, if any of the descriptors are not free.
623 * This function is invoked from upper layers to initiate transmission.
625 static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
627 struct arc_emac_priv *priv = netdev_priv(ndev);
628 unsigned int len, *txbd_curr = &priv->txbd_curr;
629 struct net_device_stats *stats = &ndev->stats;
630 __le32 *info = &priv->txbd[*txbd_curr].info;
633 if (skb_padto(skb, ETH_ZLEN))
636 len = max_t(unsigned int, ETH_ZLEN, skb->len);
638 if (unlikely(!arc_emac_tx_avail(priv))) {
639 netif_stop_queue(ndev);
640 netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n");
641 return NETDEV_TX_BUSY;
644 addr = dma_map_single(&ndev->dev, (void *)skb->data, len,
647 if (unlikely(dma_mapping_error(&ndev->dev, addr))) {
650 dev_kfree_skb_any(skb);
653 dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr);
654 dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len);
656 priv->txbd[*txbd_curr].data = cpu_to_le32(addr);
658 /* Make sure pointer to data buffer is set */
661 skb_tx_timestamp(skb);
663 *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len);
665 /* Make sure info word is set */
668 priv->tx_buff[*txbd_curr].skb = skb;
670 /* Increment index to point to the next BD */
671 *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM;
673 /* Ensure that tx_clean() sees the new txbd_curr before
674 * checking the queue status. This prevents an unneeded wake
675 * of the queue in tx_clean().
679 if (!arc_emac_tx_avail(priv)) {
680 netif_stop_queue(ndev);
681 /* Refresh tx_dirty */
683 if (arc_emac_tx_avail(priv))
684 netif_start_queue(ndev);
687 arc_reg_set(priv, R_STATUS, TXPL_MASK);
692 static void arc_emac_set_address_internal(struct net_device *ndev)
694 struct arc_emac_priv *priv = netdev_priv(ndev);
695 unsigned int addr_low, addr_hi;
697 addr_low = le32_to_cpu(*(__le32 *)&ndev->dev_addr[0]);
698 addr_hi = le16_to_cpu(*(__le16 *)&ndev->dev_addr[4]);
700 arc_reg_set(priv, R_ADDRL, addr_low);
701 arc_reg_set(priv, R_ADDRH, addr_hi);
705 * arc_emac_set_address - Set the MAC address for this device.
706 * @ndev: Pointer to net_device structure.
707 * @p: 6 byte Address to be written as MAC address.
709 * This function copies the HW address from the sockaddr structure to the
710 * net_device structure and updates the address in HW.
712 * returns: -EBUSY if the net device is busy or 0 if the address is set
715 static int arc_emac_set_address(struct net_device *ndev, void *p)
717 struct sockaddr *addr = p;
719 if (netif_running(ndev))
722 if (!is_valid_ether_addr(addr->sa_data))
723 return -EADDRNOTAVAIL;
725 memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
727 arc_emac_set_address_internal(ndev);
732 static int arc_emac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
734 if (!netif_running(dev))
740 return phy_mii_ioctl(dev->phydev, rq, cmd);
744 static const struct net_device_ops arc_emac_netdev_ops = {
745 .ndo_open = arc_emac_open,
746 .ndo_stop = arc_emac_stop,
747 .ndo_start_xmit = arc_emac_tx,
748 .ndo_set_mac_address = arc_emac_set_address,
749 .ndo_get_stats = arc_emac_stats,
750 .ndo_set_rx_mode = arc_emac_set_rx_mode,
751 .ndo_do_ioctl = arc_emac_ioctl,
752 #ifdef CONFIG_NET_POLL_CONTROLLER
753 .ndo_poll_controller = arc_emac_poll_controller,
757 int arc_emac_probe(struct net_device *ndev, int interface)
759 struct device *dev = ndev->dev.parent;
760 struct resource res_regs;
761 struct device_node *phy_node;
762 struct phy_device *phydev = NULL;
763 struct arc_emac_priv *priv;
764 const char *mac_addr;
765 unsigned int id, clock_frequency, irq;
768 /* Get PHY from device tree */
769 phy_node = of_parse_phandle(dev->of_node, "phy", 0);
771 dev_err(dev, "failed to retrieve phy description from device tree\n");
775 /* Get EMAC registers base address from device tree */
776 err = of_address_to_resource(dev->of_node, 0, &res_regs);
778 dev_err(dev, "failed to retrieve registers base from device tree\n");
783 /* Get IRQ from device tree */
784 irq = irq_of_parse_and_map(dev->of_node, 0);
786 dev_err(dev, "failed to retrieve <irq> value from device tree\n");
791 ndev->netdev_ops = &arc_emac_netdev_ops;
792 ndev->ethtool_ops = &arc_emac_ethtool_ops;
793 ndev->watchdog_timeo = TX_TIMEOUT;
795 priv = netdev_priv(ndev);
798 priv->regs = devm_ioremap_resource(dev, &res_regs);
799 if (IS_ERR(priv->regs)) {
800 err = PTR_ERR(priv->regs);
804 dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs);
807 err = clk_prepare_enable(priv->clk);
809 dev_err(dev, "failed to enable clock\n");
813 clock_frequency = clk_get_rate(priv->clk);
815 /* Get CPU clock frequency from device tree */
816 if (of_property_read_u32(dev->of_node, "clock-frequency",
818 dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n");
824 id = arc_reg_get(priv, R_ID);
826 /* Check for EMAC revision 5 or 7, magic number */
827 if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
828 dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id);
832 dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id);
834 /* Set poll rate so that it polls every 1 ms */
835 arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000);
838 dev_info(dev, "IRQ is %d\n", ndev->irq);
840 /* Register interrupt handler for device */
841 err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0,
844 dev_err(dev, "could not allocate IRQ\n");
848 /* Get MAC address from device tree */
849 mac_addr = of_get_mac_address(dev->of_node);
852 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
854 eth_hw_addr_random(ndev);
856 arc_emac_set_address_internal(ndev);
857 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
859 /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
860 priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ,
861 &priv->rxbd_dma, GFP_KERNEL);
864 dev_err(dev, "failed to allocate data buffers\n");
869 priv->txbd = priv->rxbd + RX_BD_NUM;
871 priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ;
872 dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
873 (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma);
875 err = arc_mdio_probe(priv);
877 dev_err(dev, "failed to probe MII bus\n");
881 phydev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
884 dev_err(dev, "of_phy_connect() failed\n");
889 dev_info(dev, "connected to %s phy with id 0x%x\n",
890 phydev->drv->name, phydev->phy_id);
892 netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT);
894 err = register_netdev(ndev);
896 dev_err(dev, "failed to register network device\n");
900 of_node_put(phy_node);
904 netif_napi_del(&priv->napi);
905 phy_disconnect(phydev);
907 arc_mdio_remove(priv);
910 clk_disable_unprepare(priv->clk);
912 of_node_put(phy_node);
916 EXPORT_SYMBOL_GPL(arc_emac_probe);
918 int arc_emac_remove(struct net_device *ndev)
920 struct arc_emac_priv *priv = netdev_priv(ndev);
922 phy_disconnect(ndev->phydev);
923 arc_mdio_remove(priv);
924 unregister_netdev(ndev);
925 netif_napi_del(&priv->napi);
927 if (!IS_ERR(priv->clk))
928 clk_disable_unprepare(priv->clk);
932 EXPORT_SYMBOL_GPL(arc_emac_remove);
934 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
935 MODULE_DESCRIPTION("ARC EMAC driver");
936 MODULE_LICENSE("GPL");