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>
31 * arc_emac_tx_avail - Return the number of available slots in the tx ring.
32 * @priv: Pointer to ARC EMAC private data structure.
34 * returns: the number of slots available for transmission in tx the ring.
36 static inline int arc_emac_tx_avail(struct arc_emac_priv *priv)
38 return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM;
42 * arc_emac_adjust_link - Adjust the PHY link duplex.
43 * @ndev: Pointer to the net_device structure.
45 * This function is called to change the duplex setting after auto negotiation
48 static void arc_emac_adjust_link(struct net_device *ndev)
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;
54 if (priv->link != phy_dev->link) {
55 priv->link = phy_dev->link;
59 if (priv->speed != phy_dev->speed) {
60 priv->speed = phy_dev->speed;
62 if (priv->set_mac_speed)
63 priv->set_mac_speed(priv, priv->speed);
66 if (priv->duplex != phy_dev->duplex) {
67 reg = arc_reg_get(priv, R_CTRL);
69 if (DUPLEX_FULL == phy_dev->duplex)
74 arc_reg_set(priv, R_CTRL, reg);
75 priv->duplex = phy_dev->duplex;
80 phy_print_status(phy_dev);
84 * arc_emac_get_settings - Get PHY settings.
85 * @ndev: Pointer to net_device structure.
86 * @cmd: Pointer to ethtool_cmd structure.
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.
93 static int arc_emac_get_settings(struct net_device *ndev,
94 struct ethtool_cmd *cmd)
96 struct arc_emac_priv *priv = netdev_priv(ndev);
98 return phy_ethtool_gset(priv->phy_dev, cmd);
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.
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
112 static int arc_emac_set_settings(struct net_device *ndev,
113 struct ethtool_cmd *cmd)
115 struct arc_emac_priv *priv = netdev_priv(ndev);
117 if (!capable(CAP_NET_ADMIN))
120 return phy_ethtool_sset(priv->phy_dev, cmd);
124 * arc_emac_get_drvinfo - Get EMAC driver information.
125 * @ndev: Pointer to net_device structure.
126 * @info: Pointer to ethtool_drvinfo structure.
128 * This implements ethtool command for getting the driver information.
129 * Issue "ethtool -i ethX" under linux prompt to execute this function.
131 static void arc_emac_get_drvinfo(struct net_device *ndev,
132 struct ethtool_drvinfo *info)
134 struct arc_emac_priv *priv = netdev_priv(ndev);
136 strlcpy(info->driver, priv->drv_name, sizeof(info->driver));
137 strlcpy(info->version, priv->drv_version, sizeof(info->version));
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,
147 #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK)
150 * arc_emac_tx_clean - clears processed by EMAC Tx BDs.
151 * @ndev: Pointer to the network device.
153 static void arc_emac_tx_clean(struct net_device *ndev)
155 struct arc_emac_priv *priv = netdev_priv(ndev);
156 struct net_device_stats *stats = &ndev->stats;
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);
166 if ((info & FOR_EMAC) || !txbd->data || !skb)
169 if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) {
174 stats->tx_carrier_errors++;
180 stats->tx_fifo_errors++;
181 } else if (likely(info & FIRST_OR_LAST_MASK)) {
183 stats->tx_bytes += skb->len;
186 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
187 dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
189 /* return the sk_buff to system */
190 dev_kfree_skb_irq(skb);
196 *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
199 /* Ensure that txbd_dirty is visible to tx() before checking
204 if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv))
205 netif_wake_queue(ndev);
209 * arc_emac_rx - processing of Rx packets.
210 * @ndev: Pointer to the network device.
211 * @budget: How many BDs to process on 1 call.
213 * returns: Number of processed BDs
215 * Iterate through Rx BDs and deliver received packages to upper layer.
217 static int arc_emac_rx(struct net_device *ndev, int budget)
219 struct arc_emac_priv *priv = netdev_priv(ndev);
220 unsigned int work_done;
222 for (work_done = 0; work_done < budget; work_done++) {
223 unsigned int *last_rx_bd = &priv->last_rx_bd;
224 struct net_device_stats *stats = &ndev->stats;
225 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
226 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
227 unsigned int pktlen, info = le32_to_cpu(rxbd->info);
231 if (unlikely((info & OWN_MASK) == FOR_EMAC))
234 /* Make a note that we saw a packet at this BD.
235 * So next time, driver starts from this + 1
237 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
239 if (unlikely((info & FIRST_OR_LAST_MASK) !=
240 FIRST_OR_LAST_MASK)) {
241 /* We pre-allocate buffers of MTU size so incoming
242 * packets won't be split/chained.
245 netdev_err(ndev, "incomplete packet received\n");
247 /* Return ownership to EMAC */
248 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
250 stats->rx_length_errors++;
254 pktlen = info & LEN_MASK;
256 stats->rx_bytes += pktlen;
258 skb_put(skb, pktlen);
260 skb->protocol = eth_type_trans(skb, ndev);
262 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
263 dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
265 /* Prepare the BD for next cycle */
266 rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
268 if (unlikely(!rx_buff->skb)) {
270 /* Because receive_skb is below, increment rx_dropped */
275 /* receive_skb only if new skb was allocated to avoid holes */
276 netif_receive_skb(skb);
278 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
279 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
280 if (dma_mapping_error(&ndev->dev, addr)) {
282 netdev_err(ndev, "cannot dma map\n");
283 dev_kfree_skb(rx_buff->skb);
287 dma_unmap_addr_set(rx_buff, addr, addr);
288 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
290 rxbd->data = cpu_to_le32(addr);
292 /* Make sure pointer to data buffer is set */
295 /* Return ownership to EMAC */
296 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
303 * arc_emac_poll - NAPI poll handler.
304 * @napi: Pointer to napi_struct structure.
305 * @budget: How many BDs to process on 1 call.
307 * returns: Number of processed BDs
309 static int arc_emac_poll(struct napi_struct *napi, int budget)
311 struct net_device *ndev = napi->dev;
312 struct arc_emac_priv *priv = netdev_priv(ndev);
313 unsigned int work_done;
315 arc_emac_tx_clean(ndev);
317 work_done = arc_emac_rx(ndev, budget);
318 if (work_done < budget) {
320 arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
327 * arc_emac_intr - Global interrupt handler for EMAC.
329 * @dev_instance: device instance.
331 * returns: IRQ_HANDLED for all cases.
333 * ARC EMAC has only 1 interrupt line, and depending on bits raised in
334 * STATUS register we may tell what is a reason for interrupt to fire.
336 static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
338 struct net_device *ndev = dev_instance;
339 struct arc_emac_priv *priv = netdev_priv(ndev);
340 struct net_device_stats *stats = &ndev->stats;
343 status = arc_reg_get(priv, R_STATUS);
344 status &= ~MDIO_MASK;
346 /* Reset all flags except "MDIO complete" */
347 arc_reg_set(priv, R_STATUS, status);
349 if (status & (RXINT_MASK | TXINT_MASK)) {
350 if (likely(napi_schedule_prep(&priv->napi))) {
351 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK);
352 __napi_schedule(&priv->napi);
356 if (status & ERR_MASK) {
357 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
358 * 8-bit error counter overrun.
361 if (status & MSER_MASK) {
362 stats->rx_missed_errors += 0x100;
363 stats->rx_errors += 0x100;
366 if (status & RXCR_MASK) {
367 stats->rx_crc_errors += 0x100;
368 stats->rx_errors += 0x100;
371 if (status & RXFR_MASK) {
372 stats->rx_frame_errors += 0x100;
373 stats->rx_errors += 0x100;
376 if (status & RXFL_MASK) {
377 stats->rx_over_errors += 0x100;
378 stats->rx_errors += 0x100;
385 #ifdef CONFIG_NET_POLL_CONTROLLER
386 static void arc_emac_poll_controller(struct net_device *dev)
388 disable_irq(dev->irq);
389 arc_emac_intr(dev->irq, dev);
390 enable_irq(dev->irq);
395 * arc_emac_open - Open the network device.
396 * @ndev: Pointer to the network device.
398 * returns: 0, on success or non-zero error value on failure.
400 * This function sets the MAC address, requests and enables an IRQ
401 * for the EMAC device and starts the Tx queue.
402 * It also connects to the phy device.
404 static int arc_emac_open(struct net_device *ndev)
406 struct arc_emac_priv *priv = netdev_priv(ndev);
407 struct phy_device *phy_dev = priv->phy_dev;
410 phy_dev->autoneg = AUTONEG_ENABLE;
413 phy_dev->advertising &= phy_dev->supported;
415 priv->last_rx_bd = 0;
417 /* Allocate and set buffers for Rx BD's */
418 for (i = 0; i < RX_BD_NUM; i++) {
420 unsigned int *last_rx_bd = &priv->last_rx_bd;
421 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
422 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
424 rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
426 if (unlikely(!rx_buff->skb))
429 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
430 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
431 if (dma_mapping_error(&ndev->dev, addr)) {
432 netdev_err(ndev, "cannot dma map\n");
433 dev_kfree_skb(rx_buff->skb);
436 dma_unmap_addr_set(rx_buff, addr, addr);
437 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
439 rxbd->data = cpu_to_le32(addr);
441 /* Make sure pointer to data buffer is set */
444 /* Return ownership to EMAC */
445 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
447 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
451 priv->txbd_dirty = 0;
454 memset(priv->txbd, 0, TX_RING_SZ);
456 /* Initialize logical address filter */
457 arc_reg_set(priv, R_LAFL, 0);
458 arc_reg_set(priv, R_LAFH, 0);
460 /* Set BD ring pointers for device side */
461 arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma);
462 arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma);
464 /* Enable interrupts */
465 arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
468 arc_reg_set(priv, R_CTRL,
469 (RX_BD_NUM << 24) | /* RX BD table length */
470 (TX_BD_NUM << 16) | /* TX BD table length */
471 TXRN_MASK | RXRN_MASK);
473 napi_enable(&priv->napi);
476 arc_reg_or(priv, R_CTRL, EN_MASK);
478 phy_start_aneg(priv->phy_dev);
480 netif_start_queue(ndev);
486 * arc_emac_set_rx_mode - Change the receive filtering mode.
487 * @ndev: Pointer to the network device.
489 * This function enables/disables promiscuous or all-multicast mode
490 * and updates the multicast filtering list of the network device.
492 static void arc_emac_set_rx_mode(struct net_device *ndev)
494 struct arc_emac_priv *priv = netdev_priv(ndev);
496 if (ndev->flags & IFF_PROMISC) {
497 arc_reg_or(priv, R_CTRL, PROM_MASK);
499 arc_reg_clr(priv, R_CTRL, PROM_MASK);
501 if (ndev->flags & IFF_ALLMULTI) {
502 arc_reg_set(priv, R_LAFL, ~0);
503 arc_reg_set(priv, R_LAFH, ~0);
505 struct netdev_hw_addr *ha;
506 unsigned int filter[2] = { 0, 0 };
509 netdev_for_each_mc_addr(ha, ndev) {
510 bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26;
511 filter[bit >> 5] |= 1 << (bit & 31);
514 arc_reg_set(priv, R_LAFL, filter[0]);
515 arc_reg_set(priv, R_LAFH, filter[1]);
521 * arc_free_tx_queue - free skb from tx queue
522 * @ndev: Pointer to the network device.
524 * This function must be called while EMAC disable
526 static void arc_free_tx_queue(struct net_device *ndev)
528 struct arc_emac_priv *priv = netdev_priv(ndev);
531 for (i = 0; i < TX_BD_NUM; i++) {
532 struct arc_emac_bd *txbd = &priv->txbd[i];
533 struct buffer_state *tx_buff = &priv->tx_buff[i];
536 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
537 dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
539 /* return the sk_buff to system */
540 dev_kfree_skb_irq(tx_buff->skb);
550 * arc_free_rx_queue - free skb from rx queue
551 * @ndev: Pointer to the network device.
553 * This function must be called while EMAC disable
555 static void arc_free_rx_queue(struct net_device *ndev)
557 struct arc_emac_priv *priv = netdev_priv(ndev);
560 for (i = 0; i < RX_BD_NUM; i++) {
561 struct arc_emac_bd *rxbd = &priv->rxbd[i];
562 struct buffer_state *rx_buff = &priv->rx_buff[i];
565 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
566 dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
568 /* return the sk_buff to system */
569 dev_kfree_skb_irq(rx_buff->skb);
579 * arc_emac_stop - Close the network device.
580 * @ndev: Pointer to the network device.
582 * This function stops the Tx queue, disables interrupts and frees the IRQ for
584 * It also disconnects the PHY device associated with the EMAC device.
586 static int arc_emac_stop(struct net_device *ndev)
588 struct arc_emac_priv *priv = netdev_priv(ndev);
590 napi_disable(&priv->napi);
591 netif_stop_queue(ndev);
593 /* Disable interrupts */
594 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK);
597 arc_reg_clr(priv, R_CTRL, EN_MASK);
599 /* Return the sk_buff to system */
600 arc_free_tx_queue(ndev);
601 arc_free_rx_queue(ndev);
607 * arc_emac_stats - Get system network statistics.
608 * @ndev: Pointer to net_device structure.
610 * Returns the address of the device statistics structure.
611 * Statistics are updated in interrupt handler.
613 static struct net_device_stats *arc_emac_stats(struct net_device *ndev)
615 struct arc_emac_priv *priv = netdev_priv(ndev);
616 struct net_device_stats *stats = &ndev->stats;
617 unsigned long miss, rxerr;
618 u8 rxcrc, rxfram, rxoflow;
620 rxerr = arc_reg_get(priv, R_RXERR);
621 miss = arc_reg_get(priv, R_MISS);
625 rxoflow = rxerr >> 16;
627 stats->rx_errors += miss;
628 stats->rx_errors += rxcrc + rxfram + rxoflow;
630 stats->rx_over_errors += rxoflow;
631 stats->rx_frame_errors += rxfram;
632 stats->rx_crc_errors += rxcrc;
633 stats->rx_missed_errors += miss;
639 * arc_emac_tx - Starts the data transmission.
640 * @skb: sk_buff pointer that contains data to be Transmitted.
641 * @ndev: Pointer to net_device structure.
643 * returns: NETDEV_TX_OK, on success
644 * NETDEV_TX_BUSY, if any of the descriptors are not free.
646 * This function is invoked from upper layers to initiate transmission.
648 static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
650 struct arc_emac_priv *priv = netdev_priv(ndev);
651 unsigned int len, *txbd_curr = &priv->txbd_curr;
652 struct net_device_stats *stats = &ndev->stats;
653 __le32 *info = &priv->txbd[*txbd_curr].info;
656 if (skb_padto(skb, ETH_ZLEN))
659 len = max_t(unsigned int, ETH_ZLEN, skb->len);
661 if (unlikely(!arc_emac_tx_avail(priv))) {
662 netif_stop_queue(ndev);
663 netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n");
664 return NETDEV_TX_BUSY;
667 addr = dma_map_single(&ndev->dev, (void *)skb->data, len,
670 if (unlikely(dma_mapping_error(&ndev->dev, addr))) {
676 dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr);
677 dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len);
679 priv->txbd[*txbd_curr].data = cpu_to_le32(addr);
681 /* Make sure pointer to data buffer is set */
684 skb_tx_timestamp(skb);
686 *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len);
688 /* Make sure info word is set */
691 priv->tx_buff[*txbd_curr].skb = skb;
693 /* Increment index to point to the next BD */
694 *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM;
696 /* Ensure that tx_clean() sees the new txbd_curr before
697 * checking the queue status. This prevents an unneeded wake
698 * of the queue in tx_clean().
702 if (!arc_emac_tx_avail(priv)) {
703 netif_stop_queue(ndev);
704 /* Refresh tx_dirty */
706 if (arc_emac_tx_avail(priv))
707 netif_start_queue(ndev);
710 arc_reg_set(priv, R_STATUS, TXPL_MASK);
715 static void arc_emac_set_address_internal(struct net_device *ndev)
717 struct arc_emac_priv *priv = netdev_priv(ndev);
718 unsigned int addr_low, addr_hi;
720 addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]);
721 addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]);
723 arc_reg_set(priv, R_ADDRL, addr_low);
724 arc_reg_set(priv, R_ADDRH, addr_hi);
728 * arc_emac_set_address - Set the MAC address for this device.
729 * @ndev: Pointer to net_device structure.
730 * @p: 6 byte Address to be written as MAC address.
732 * This function copies the HW address from the sockaddr structure to the
733 * net_device structure and updates the address in HW.
735 * returns: -EBUSY if the net device is busy or 0 if the address is set
738 static int arc_emac_set_address(struct net_device *ndev, void *p)
740 struct sockaddr *addr = p;
742 if (netif_running(ndev))
745 if (!is_valid_ether_addr(addr->sa_data))
746 return -EADDRNOTAVAIL;
748 memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
750 arc_emac_set_address_internal(ndev);
755 static const struct net_device_ops arc_emac_netdev_ops = {
756 .ndo_open = arc_emac_open,
757 .ndo_stop = arc_emac_stop,
758 .ndo_start_xmit = arc_emac_tx,
759 .ndo_set_mac_address = arc_emac_set_address,
760 .ndo_get_stats = arc_emac_stats,
761 .ndo_set_rx_mode = arc_emac_set_rx_mode,
762 #ifdef CONFIG_NET_POLL_CONTROLLER
763 .ndo_poll_controller = arc_emac_poll_controller,
767 int arc_emac_probe(struct net_device *ndev, int interface)
769 struct device *dev = ndev->dev.parent;
770 struct resource res_regs;
771 struct device_node *phy_node;
772 struct arc_emac_priv *priv;
773 const char *mac_addr;
774 unsigned int id, clock_frequency, irq;
778 /* Get PHY from device tree */
779 phy_node = of_parse_phandle(dev->of_node, "phy", 0);
781 dev_err(dev, "failed to retrieve phy description from device tree\n");
785 /* Get EMAC registers base address from device tree */
786 err = of_address_to_resource(dev->of_node, 0, &res_regs);
788 dev_err(dev, "failed to retrieve registers base from device tree\n");
792 /* Get IRQ from device tree */
793 irq = irq_of_parse_and_map(dev->of_node, 0);
795 dev_err(dev, "failed to retrieve <irq> value from device tree\n");
800 ndev->netdev_ops = &arc_emac_netdev_ops;
801 ndev->ethtool_ops = &arc_emac_ethtool_ops;
802 ndev->watchdog_timeo = TX_TIMEOUT;
803 /* FIXME :: no multicast support yet */
804 ndev->flags &= ~IFF_MULTICAST;
806 priv = netdev_priv(ndev);
809 priv->regs = devm_ioremap_resource(dev, &res_regs);
810 if (IS_ERR(priv->regs)) {
811 return PTR_ERR(priv->regs);
813 dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs);
816 err = clk_prepare_enable(priv->clk);
818 dev_err(dev, "failed to enable clock\n");
822 clock_frequency = clk_get_rate(priv->clk);
824 /* Get CPU clock frequency from device tree */
825 if (of_property_read_u32(dev->of_node, "clock-frequency",
827 dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n");
832 id = arc_reg_get(priv, R_ID);
834 /* Check for EMAC revision 5 or 7, magic number */
835 if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
836 dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id);
840 dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id);
842 /* Set poll rate so that it polls every 1 ms */
843 arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000);
846 dev_info(dev, "IRQ is %d\n", ndev->irq);
848 /* Register interrupt handler for device */
849 err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0,
852 dev_err(dev, "could not allocate IRQ\n");
856 /* Get MAC address from device tree */
857 mac_addr = of_get_mac_address(dev->of_node);
860 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
862 eth_hw_addr_random(ndev);
864 arc_emac_set_address_internal(ndev);
865 dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr);
867 /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
868 priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ,
869 &priv->rxbd_dma, GFP_KERNEL);
872 dev_err(dev, "failed to allocate data buffers\n");
877 priv->txbd = priv->rxbd + RX_BD_NUM;
879 priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ;
880 dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
881 (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma);
883 err = arc_mdio_probe(priv);
885 dev_err(dev, "failed to probe MII bus\n");
889 priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
891 if (!priv->phy_dev) {
892 dev_err(dev, "of_phy_connect() failed\n");
897 dev_info(dev, "connected to %s phy with id 0x%x\n",
898 priv->phy_dev->drv->name, priv->phy_dev->phy_id);
900 netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT);
902 err = register_netdev(ndev);
904 dev_err(dev, "failed to register network device\n");
911 netif_napi_del(&priv->napi);
912 phy_disconnect(priv->phy_dev);
913 priv->phy_dev = NULL;
915 arc_mdio_remove(priv);
918 clk_disable_unprepare(priv->clk);
921 EXPORT_SYMBOL_GPL(arc_emac_probe);
923 int arc_emac_remove(struct net_device *ndev)
925 struct arc_emac_priv *priv = netdev_priv(ndev);
927 phy_disconnect(priv->phy_dev);
928 priv->phy_dev = NULL;
929 arc_mdio_remove(priv);
930 unregister_netdev(ndev);
931 netif_napi_del(&priv->napi);
933 if (!IS_ERR(priv->clk)) {
934 clk_disable_unprepare(priv->clk);
940 EXPORT_SYMBOL_GPL(arc_emac_remove);
942 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
943 MODULE_DESCRIPTION("ARC EMAC driver");
944 MODULE_LICENSE("GPL");