Linux 3.11-rc3
[cris-mirror.git] / drivers / net / ethernet / arc / emac_main.c
blobf1b121ee5525bfa974010663da5807e9b4d038e5
1 /*
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)
10 * Contributors:
11 * Amit Bhor
12 * Sameer Dhavale
13 * Vineet Gupta
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>
26 #include "emac.h"
28 #define DRV_NAME "arc_emac"
29 #define DRV_VERSION "1.0"
31 /**
32 * arc_emac_adjust_link - Adjust the PHY link duplex.
33 * @ndev: Pointer to the net_device structure.
35 * This function is called to change the duplex setting after auto negotiation
36 * is done by the PHY.
38 static void arc_emac_adjust_link(struct net_device *ndev)
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;
44 if (priv->link != phy_dev->link) {
45 priv->link = phy_dev->link;
46 state_changed = 1;
49 if (priv->speed != phy_dev->speed) {
50 priv->speed = phy_dev->speed;
51 state_changed = 1;
54 if (priv->duplex != phy_dev->duplex) {
55 reg = arc_reg_get(priv, R_CTRL);
57 if (DUPLEX_FULL == phy_dev->duplex)
58 reg |= ENFL_MASK;
59 else
60 reg &= ~ENFL_MASK;
62 arc_reg_set(priv, R_CTRL, reg);
63 priv->duplex = phy_dev->duplex;
64 state_changed = 1;
67 if (state_changed)
68 phy_print_status(phy_dev);
71 /**
72 * arc_emac_get_settings - Get PHY settings.
73 * @ndev: Pointer to net_device structure.
74 * @cmd: Pointer to ethtool_cmd structure.
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.
81 static int arc_emac_get_settings(struct net_device *ndev,
82 struct ethtool_cmd *cmd)
84 struct arc_emac_priv *priv = netdev_priv(ndev);
86 return phy_ethtool_gset(priv->phy_dev, cmd);
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.
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.
100 static int arc_emac_set_settings(struct net_device *ndev,
101 struct ethtool_cmd *cmd)
103 struct arc_emac_priv *priv = netdev_priv(ndev);
105 if (!capable(CAP_NET_ADMIN))
106 return -EPERM;
108 return phy_ethtool_sset(priv->phy_dev, cmd);
112 * arc_emac_get_drvinfo - Get EMAC driver information.
113 * @ndev: Pointer to net_device structure.
114 * @info: Pointer to ethtool_drvinfo structure.
116 * This implements ethtool command for getting the driver information.
117 * Issue "ethtool -i ethX" under linux prompt to execute this function.
119 static void arc_emac_get_drvinfo(struct net_device *ndev,
120 struct ethtool_drvinfo *info)
122 strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
123 strlcpy(info->version, DRV_VERSION, sizeof(info->version));
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,
133 #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK)
136 * arc_emac_tx_clean - clears processed by EMAC Tx BDs.
137 * @ndev: Pointer to the network device.
139 static void arc_emac_tx_clean(struct net_device *ndev)
141 struct arc_emac_priv *priv = netdev_priv(ndev);
142 struct net_device_stats *stats = &priv->stats;
143 unsigned int i;
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);
152 *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
154 if ((info & FOR_EMAC) || !txbd->data)
155 break;
157 if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) {
158 stats->tx_errors++;
159 stats->tx_dropped++;
161 if (info & DEFR)
162 stats->tx_carrier_errors++;
164 if (info & LTCL)
165 stats->collisions++;
167 if (info & UFLO)
168 stats->tx_fifo_errors++;
169 } else if (likely(info & FIRST_OR_LAST_MASK)) {
170 stats->tx_packets++;
171 stats->tx_bytes += skb->len;
174 dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr),
175 dma_unmap_len(tx_buff, len), DMA_TO_DEVICE);
177 /* return the sk_buff to system */
178 dev_kfree_skb_irq(skb);
180 txbd->data = 0;
181 txbd->info = 0;
183 if (netif_queue_stopped(ndev))
184 netif_wake_queue(ndev);
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.
193 * returns: Number of processed BDs
195 * Iterate through Rx BDs and deliver received packages to upper layer.
197 static int arc_emac_rx(struct net_device *ndev, int budget)
199 struct arc_emac_priv *priv = netdev_priv(ndev);
200 unsigned int work_done;
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;
211 if (unlikely((info & OWN_MASK) == FOR_EMAC))
212 break;
214 /* Make a note that we saw a packet at this BD.
215 * So next time, driver starts from this + 1
217 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
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.
224 if (net_ratelimit())
225 netdev_err(ndev, "incomplete packet received\n");
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;
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);
242 dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr),
243 dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE);
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;
255 /* receive_skb only if new skb was allocated to avoid holes */
256 netif_receive_skb(skb);
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;
267 dma_unmap_addr_set(rx_buff, addr, addr);
268 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
270 rxbd->data = cpu_to_le32(addr);
272 /* Make sure pointer to data buffer is set */
273 wmb();
275 /* Return ownership to EMAC */
276 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
279 return work_done;
283 * arc_emac_poll - NAPI poll handler.
284 * @napi: Pointer to napi_struct structure.
285 * @budget: How many BDs to process on 1 call.
287 * returns: Number of processed BDs
289 static int arc_emac_poll(struct napi_struct *napi, int budget)
291 struct net_device *ndev = napi->dev;
292 struct arc_emac_priv *priv = netdev_priv(ndev);
293 unsigned int work_done;
295 arc_emac_tx_clean(ndev);
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);
303 return work_done;
307 * arc_emac_intr - Global interrupt handler for EMAC.
308 * @irq: irq number.
309 * @dev_instance: device instance.
311 * returns: IRQ_HANDLED for all cases.
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.
316 static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
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;
323 status = arc_reg_get(priv, R_STATUS);
324 status &= ~MDIO_MASK;
326 /* Reset all flags except "MDIO complete" */
327 arc_reg_set(priv, R_STATUS, status);
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);
336 if (status & ERR_MASK) {
337 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
338 * 8-bit error counter overrun.
341 if (status & MSER_MASK) {
342 stats->rx_missed_errors += 0x100;
343 stats->rx_errors += 0x100;
346 if (status & RXCR_MASK) {
347 stats->rx_crc_errors += 0x100;
348 stats->rx_errors += 0x100;
351 if (status & RXFR_MASK) {
352 stats->rx_frame_errors += 0x100;
353 stats->rx_errors += 0x100;
356 if (status & RXFL_MASK) {
357 stats->rx_over_errors += 0x100;
358 stats->rx_errors += 0x100;
362 return IRQ_HANDLED;
366 * arc_emac_open - Open the network device.
367 * @ndev: Pointer to the network device.
369 * returns: 0, on success or non-zero error value on failure.
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.
375 static int arc_emac_open(struct net_device *ndev)
377 struct arc_emac_priv *priv = netdev_priv(ndev);
378 struct phy_device *phy_dev = priv->phy_dev;
379 int i;
381 phy_dev->autoneg = AUTONEG_ENABLE;
382 phy_dev->speed = 0;
383 phy_dev->duplex = 0;
384 phy_dev->advertising = phy_dev->supported;
386 if (priv->max_speed > 100) {
387 phy_dev->advertising &= PHY_GBIT_FEATURES;
388 } else if (priv->max_speed <= 100) {
389 phy_dev->advertising &= PHY_BASIC_FEATURES;
390 if (priv->max_speed <= 10) {
391 phy_dev->advertising &= ~SUPPORTED_100baseT_Half;
392 phy_dev->advertising &= ~SUPPORTED_100baseT_Full;
396 priv->last_rx_bd = 0;
398 /* Allocate and set buffers for Rx BD's */
399 for (i = 0; i < RX_BD_NUM; i++) {
400 dma_addr_t addr;
401 unsigned int *last_rx_bd = &priv->last_rx_bd;
402 struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
403 struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
405 rx_buff->skb = netdev_alloc_skb_ip_align(ndev,
406 EMAC_BUFFER_SIZE);
407 if (unlikely(!rx_buff->skb))
408 return -ENOMEM;
410 addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
411 EMAC_BUFFER_SIZE, DMA_FROM_DEVICE);
412 if (dma_mapping_error(&ndev->dev, addr)) {
413 netdev_err(ndev, "cannot dma map\n");
414 dev_kfree_skb(rx_buff->skb);
415 return -ENOMEM;
417 dma_unmap_addr_set(rx_buff, addr, addr);
418 dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE);
420 rxbd->data = cpu_to_le32(addr);
422 /* Make sure pointer to data buffer is set */
423 wmb();
425 /* Return ownership to EMAC */
426 rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
428 *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
431 /* Clean Tx BD's */
432 memset(priv->txbd, 0, TX_RING_SZ);
434 /* Initialize logical address filter */
435 arc_reg_set(priv, R_LAFL, 0);
436 arc_reg_set(priv, R_LAFH, 0);
438 /* Set BD ring pointers for device side */
439 arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma);
440 arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma);
442 /* Enable interrupts */
443 arc_reg_set(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
445 /* Set CONTROL */
446 arc_reg_set(priv, R_CTRL,
447 (RX_BD_NUM << 24) | /* RX BD table length */
448 (TX_BD_NUM << 16) | /* TX BD table length */
449 TXRN_MASK | RXRN_MASK);
451 napi_enable(&priv->napi);
453 /* Enable EMAC */
454 arc_reg_or(priv, R_CTRL, EN_MASK);
456 phy_start_aneg(priv->phy_dev);
458 netif_start_queue(ndev);
460 return 0;
464 * arc_emac_stop - Close the network device.
465 * @ndev: Pointer to the network device.
467 * This function stops the Tx queue, disables interrupts and frees the IRQ for
468 * the EMAC device.
469 * It also disconnects the PHY device associated with the EMAC device.
471 static int arc_emac_stop(struct net_device *ndev)
473 struct arc_emac_priv *priv = netdev_priv(ndev);
475 napi_disable(&priv->napi);
476 netif_stop_queue(ndev);
478 /* Disable interrupts */
479 arc_reg_clr(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
481 /* Disable EMAC */
482 arc_reg_clr(priv, R_CTRL, EN_MASK);
484 return 0;
488 * arc_emac_stats - Get system network statistics.
489 * @ndev: Pointer to net_device structure.
491 * Returns the address of the device statistics structure.
492 * Statistics are updated in interrupt handler.
494 static struct net_device_stats *arc_emac_stats(struct net_device *ndev)
496 struct arc_emac_priv *priv = netdev_priv(ndev);
497 struct net_device_stats *stats = &priv->stats;
498 unsigned long miss, rxerr;
499 u8 rxcrc, rxfram, rxoflow;
501 rxerr = arc_reg_get(priv, R_RXERR);
502 miss = arc_reg_get(priv, R_MISS);
504 rxcrc = rxerr;
505 rxfram = rxerr >> 8;
506 rxoflow = rxerr >> 16;
508 stats->rx_errors += miss;
509 stats->rx_errors += rxcrc + rxfram + rxoflow;
511 stats->rx_over_errors += rxoflow;
512 stats->rx_frame_errors += rxfram;
513 stats->rx_crc_errors += rxcrc;
514 stats->rx_missed_errors += miss;
516 return stats;
520 * arc_emac_tx - Starts the data transmission.
521 * @skb: sk_buff pointer that contains data to be Transmitted.
522 * @ndev: Pointer to net_device structure.
524 * returns: NETDEV_TX_OK, on success
525 * NETDEV_TX_BUSY, if any of the descriptors are not free.
527 * This function is invoked from upper layers to initiate transmission.
529 static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
531 struct arc_emac_priv *priv = netdev_priv(ndev);
532 unsigned int len, *txbd_curr = &priv->txbd_curr;
533 struct net_device_stats *stats = &priv->stats;
534 __le32 *info = &priv->txbd[*txbd_curr].info;
535 dma_addr_t addr;
537 if (skb_padto(skb, ETH_ZLEN))
538 return NETDEV_TX_OK;
540 len = max_t(unsigned int, ETH_ZLEN, skb->len);
542 /* EMAC still holds this buffer in its possession.
543 * CPU must not modify this buffer descriptor
545 if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) {
546 netif_stop_queue(ndev);
547 return NETDEV_TX_BUSY;
550 addr = dma_map_single(&ndev->dev, (void *)skb->data, len,
551 DMA_TO_DEVICE);
553 if (unlikely(dma_mapping_error(&ndev->dev, addr))) {
554 stats->tx_dropped++;
555 stats->tx_errors++;
556 dev_kfree_skb(skb);
557 return NETDEV_TX_OK;
559 dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr);
560 dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len);
562 priv->tx_buff[*txbd_curr].skb = skb;
563 priv->txbd[*txbd_curr].data = cpu_to_le32(addr);
565 /* Make sure pointer to data buffer is set */
566 wmb();
568 *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len);
570 /* Increment index to point to the next BD */
571 *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM;
573 /* Get "info" of the next BD */
574 info = &priv->txbd[*txbd_curr].info;
576 /* Check if if Tx BD ring is full - next BD is still owned by EMAC */
577 if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC))
578 netif_stop_queue(ndev);
580 arc_reg_set(priv, R_STATUS, TXPL_MASK);
582 skb_tx_timestamp(skb);
584 return NETDEV_TX_OK;
588 * arc_emac_set_address - Set the MAC address for this device.
589 * @ndev: Pointer to net_device structure.
590 * @p: 6 byte Address to be written as MAC address.
592 * This function copies the HW address from the sockaddr structure to the
593 * net_device structure and updates the address in HW.
595 * returns: -EBUSY if the net device is busy or 0 if the address is set
596 * successfully.
598 static int arc_emac_set_address(struct net_device *ndev, void *p)
600 struct arc_emac_priv *priv = netdev_priv(ndev);
601 struct sockaddr *addr = p;
602 unsigned int addr_low, addr_hi;
604 if (netif_running(ndev))
605 return -EBUSY;
607 if (!is_valid_ether_addr(addr->sa_data))
608 return -EADDRNOTAVAIL;
610 memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
612 addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]);
613 addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]);
615 arc_reg_set(priv, R_ADDRL, addr_low);
616 arc_reg_set(priv, R_ADDRH, addr_hi);
618 return 0;
621 static const struct net_device_ops arc_emac_netdev_ops = {
622 .ndo_open = arc_emac_open,
623 .ndo_stop = arc_emac_stop,
624 .ndo_start_xmit = arc_emac_tx,
625 .ndo_set_mac_address = arc_emac_set_address,
626 .ndo_get_stats = arc_emac_stats,
629 static int arc_emac_probe(struct platform_device *pdev)
631 struct resource res_regs, res_irq;
632 struct device_node *phy_node;
633 struct arc_emac_priv *priv;
634 struct net_device *ndev;
635 const char *mac_addr;
636 unsigned int id, clock_frequency;
637 int err;
639 if (!pdev->dev.of_node)
640 return -ENODEV;
642 /* Get PHY from device tree */
643 phy_node = of_parse_phandle(pdev->dev.of_node, "phy", 0);
644 if (!phy_node) {
645 dev_err(&pdev->dev, "failed to retrieve phy description from device tree\n");
646 return -ENODEV;
649 /* Get EMAC registers base address from device tree */
650 err = of_address_to_resource(pdev->dev.of_node, 0, &res_regs);
651 if (err) {
652 dev_err(&pdev->dev, "failed to retrieve registers base from device tree\n");
653 return -ENODEV;
656 /* Get CPU clock frequency from device tree */
657 if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
658 &clock_frequency)) {
659 dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n");
660 return -EINVAL;
663 /* Get IRQ from device tree */
664 err = of_irq_to_resource(pdev->dev.of_node, 0, &res_irq);
665 if (!err) {
666 dev_err(&pdev->dev, "failed to retrieve <irq> value from device tree\n");
667 return -ENODEV;
670 ndev = alloc_etherdev(sizeof(struct arc_emac_priv));
671 if (!ndev)
672 return -ENOMEM;
674 SET_NETDEV_DEV(ndev, &pdev->dev);
676 ndev->netdev_ops = &arc_emac_netdev_ops;
677 ndev->ethtool_ops = &arc_emac_ethtool_ops;
678 ndev->watchdog_timeo = TX_TIMEOUT;
679 /* FIXME :: no multicast support yet */
680 ndev->flags &= ~IFF_MULTICAST;
682 priv = netdev_priv(ndev);
683 priv->dev = &pdev->dev;
684 priv->ndev = ndev;
686 priv->regs = devm_ioremap_resource(&pdev->dev, &res_regs);
687 if (IS_ERR(priv->regs)) {
688 err = PTR_ERR(priv->regs);
689 goto out;
691 dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs);
693 id = arc_reg_get(priv, R_ID);
695 /* Check for EMAC revision 5 or 7, magic number */
696 if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
697 dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id);
698 err = -ENODEV;
699 goto out;
701 dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id);
703 /* Set poll rate so that it polls every 1 ms */
704 arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000);
706 /* Get max speed of operation from device tree */
707 if (of_property_read_u32(pdev->dev.of_node, "max-speed",
708 &priv->max_speed)) {
709 dev_err(&pdev->dev, "failed to retrieve <max-speed> from device tree\n");
710 err = -EINVAL;
711 goto out;
714 ndev->irq = res_irq.start;
715 dev_info(&pdev->dev, "IRQ is %d\n", ndev->irq);
717 /* Register interrupt handler for device */
718 err = devm_request_irq(&pdev->dev, ndev->irq, arc_emac_intr, 0,
719 ndev->name, ndev);
720 if (err) {
721 dev_err(&pdev->dev, "could not allocate IRQ\n");
722 goto out;
725 /* Get MAC address from device tree */
726 mac_addr = of_get_mac_address(pdev->dev.of_node);
728 if (!mac_addr || !is_valid_ether_addr(mac_addr))
729 eth_hw_addr_random(ndev);
730 else
731 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
733 dev_info(&pdev->dev, "MAC address is now %pM\n", ndev->dev_addr);
735 /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
736 priv->rxbd = dmam_alloc_coherent(&pdev->dev, RX_RING_SZ + TX_RING_SZ,
737 &priv->rxbd_dma, GFP_KERNEL);
739 if (!priv->rxbd) {
740 dev_err(&pdev->dev, "failed to allocate data buffers\n");
741 err = -ENOMEM;
742 goto out;
745 priv->txbd = priv->rxbd + RX_BD_NUM;
747 priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ;
748 dev_dbg(&pdev->dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
749 (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma);
751 err = arc_mdio_probe(pdev, priv);
752 if (err) {
753 dev_err(&pdev->dev, "failed to probe MII bus\n");
754 goto out;
757 priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
758 PHY_INTERFACE_MODE_MII);
759 if (!priv->phy_dev) {
760 dev_err(&pdev->dev, "of_phy_connect() failed\n");
761 err = -ENODEV;
762 goto out;
765 dev_info(&pdev->dev, "connected to %s phy with id 0x%x\n",
766 priv->phy_dev->drv->name, priv->phy_dev->phy_id);
768 netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT);
770 err = register_netdev(ndev);
771 if (err) {
772 netif_napi_del(&priv->napi);
773 dev_err(&pdev->dev, "failed to register network device\n");
774 goto out;
777 return 0;
779 out:
780 free_netdev(ndev);
781 return err;
784 static int arc_emac_remove(struct platform_device *pdev)
786 struct net_device *ndev = platform_get_drvdata(pdev);
787 struct arc_emac_priv *priv = netdev_priv(ndev);
789 phy_disconnect(priv->phy_dev);
790 priv->phy_dev = NULL;
791 arc_mdio_remove(priv);
792 unregister_netdev(ndev);
793 netif_napi_del(&priv->napi);
794 free_netdev(ndev);
796 return 0;
799 static const struct of_device_id arc_emac_dt_ids[] = {
800 { .compatible = "snps,arc-emac" },
801 { /* Sentinel */ }
803 MODULE_DEVICE_TABLE(of, arc_emac_dt_ids);
805 static struct platform_driver arc_emac_driver = {
806 .probe = arc_emac_probe,
807 .remove = arc_emac_remove,
808 .driver = {
809 .name = DRV_NAME,
810 .owner = THIS_MODULE,
811 .of_match_table = arc_emac_dt_ids,
815 module_platform_driver(arc_emac_driver);
817 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
818 MODULE_DESCRIPTION("ARC EMAC driver");
819 MODULE_LICENSE("GPL");