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
= priv
->phy_dev
;
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_settings - Get PHY settings.
84 * @ndev: Pointer to net_device structure.
85 * @cmd: Pointer to ethtool_cmd structure.
87 * This implements ethtool command for getting PHY settings. If PHY could
88 * not be found, the function returns -ENODEV. This function calls the
89 * relevant PHY ethtool API to get the PHY settings.
90 * Issue "ethtool ethX" under linux prompt to execute this function.
92 static int arc_emac_get_settings(struct net_device
*ndev
,
93 struct ethtool_cmd
*cmd
)
95 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
97 return phy_ethtool_gset(priv
->phy_dev
, cmd
);
101 * arc_emac_set_settings - Set PHY settings as passed in the argument.
102 * @ndev: Pointer to net_device structure.
103 * @cmd: Pointer to ethtool_cmd structure.
105 * This implements ethtool command for setting various PHY settings. If PHY
106 * could not be found, the function returns -ENODEV. This function calls the
107 * relevant PHY ethtool API to set the PHY.
108 * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this
111 static int arc_emac_set_settings(struct net_device
*ndev
,
112 struct ethtool_cmd
*cmd
)
114 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
116 if (!capable(CAP_NET_ADMIN
))
119 return phy_ethtool_sset(priv
->phy_dev
, cmd
);
123 * arc_emac_get_drvinfo - Get EMAC driver information.
124 * @ndev: Pointer to net_device structure.
125 * @info: Pointer to ethtool_drvinfo structure.
127 * This implements ethtool command for getting the driver information.
128 * Issue "ethtool -i ethX" under linux prompt to execute this function.
130 static void arc_emac_get_drvinfo(struct net_device
*ndev
,
131 struct ethtool_drvinfo
*info
)
133 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
135 strlcpy(info
->driver
, priv
->drv_name
, sizeof(info
->driver
));
136 strlcpy(info
->version
, priv
->drv_version
, sizeof(info
->version
));
139 static const struct ethtool_ops arc_emac_ethtool_ops
= {
140 .get_settings
= arc_emac_get_settings
,
141 .set_settings
= arc_emac_set_settings
,
142 .get_drvinfo
= arc_emac_get_drvinfo
,
143 .get_link
= ethtool_op_get_link
,
146 #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK)
149 * arc_emac_tx_clean - clears processed by EMAC Tx BDs.
150 * @ndev: Pointer to the network device.
152 static void arc_emac_tx_clean(struct net_device
*ndev
)
154 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
155 struct net_device_stats
*stats
= &ndev
->stats
;
158 for (i
= 0; i
< TX_BD_NUM
; i
++) {
159 unsigned int *txbd_dirty
= &priv
->txbd_dirty
;
160 struct arc_emac_bd
*txbd
= &priv
->txbd
[*txbd_dirty
];
161 struct buffer_state
*tx_buff
= &priv
->tx_buff
[*txbd_dirty
];
162 struct sk_buff
*skb
= tx_buff
->skb
;
163 unsigned int info
= le32_to_cpu(txbd
->info
);
165 if ((info
& FOR_EMAC
) || !txbd
->data
|| !skb
)
168 if (unlikely(info
& (DROP
| DEFR
| LTCL
| UFLO
))) {
173 stats
->tx_carrier_errors
++;
179 stats
->tx_fifo_errors
++;
180 } else if (likely(info
& FIRST_OR_LAST_MASK
)) {
182 stats
->tx_bytes
+= skb
->len
;
185 dma_unmap_single(&ndev
->dev
, dma_unmap_addr(tx_buff
, addr
),
186 dma_unmap_len(tx_buff
, len
), DMA_TO_DEVICE
);
188 /* return the sk_buff to system */
189 dev_kfree_skb_irq(skb
);
195 *txbd_dirty
= (*txbd_dirty
+ 1) % TX_BD_NUM
;
198 /* Ensure that txbd_dirty is visible to tx() before checking
203 if (netif_queue_stopped(ndev
) && arc_emac_tx_avail(priv
))
204 netif_wake_queue(ndev
);
208 * arc_emac_rx - processing of Rx packets.
209 * @ndev: Pointer to the network device.
210 * @budget: How many BDs to process on 1 call.
212 * returns: Number of processed BDs
214 * Iterate through Rx BDs and deliver received packages to upper layer.
216 static int arc_emac_rx(struct net_device
*ndev
, int budget
)
218 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
219 unsigned int work_done
;
221 for (work_done
= 0; work_done
< budget
; work_done
++) {
222 unsigned int *last_rx_bd
= &priv
->last_rx_bd
;
223 struct net_device_stats
*stats
= &ndev
->stats
;
224 struct buffer_state
*rx_buff
= &priv
->rx_buff
[*last_rx_bd
];
225 struct arc_emac_bd
*rxbd
= &priv
->rxbd
[*last_rx_bd
];
226 unsigned int pktlen
, info
= le32_to_cpu(rxbd
->info
);
230 if (unlikely((info
& OWN_MASK
) == FOR_EMAC
))
233 /* Make a note that we saw a packet at this BD.
234 * So next time, driver starts from this + 1
236 *last_rx_bd
= (*last_rx_bd
+ 1) % RX_BD_NUM
;
238 if (unlikely((info
& FIRST_OR_LAST_MASK
) !=
239 FIRST_OR_LAST_MASK
)) {
240 /* We pre-allocate buffers of MTU size so incoming
241 * packets won't be split/chained.
244 netdev_err(ndev
, "incomplete packet received\n");
246 /* Return ownership to EMAC */
247 rxbd
->info
= cpu_to_le32(FOR_EMAC
| EMAC_BUFFER_SIZE
);
249 stats
->rx_length_errors
++;
253 pktlen
= info
& LEN_MASK
;
255 stats
->rx_bytes
+= pktlen
;
257 skb_put(skb
, pktlen
);
259 skb
->protocol
= eth_type_trans(skb
, ndev
);
261 dma_unmap_single(&ndev
->dev
, dma_unmap_addr(rx_buff
, addr
),
262 dma_unmap_len(rx_buff
, len
), DMA_FROM_DEVICE
);
264 /* Prepare the BD for next cycle */
265 rx_buff
->skb
= netdev_alloc_skb_ip_align(ndev
,
267 if (unlikely(!rx_buff
->skb
)) {
269 /* Because receive_skb is below, increment rx_dropped */
274 /* receive_skb only if new skb was allocated to avoid holes */
275 netif_receive_skb(skb
);
277 addr
= dma_map_single(&ndev
->dev
, (void *)rx_buff
->skb
->data
,
278 EMAC_BUFFER_SIZE
, DMA_FROM_DEVICE
);
279 if (dma_mapping_error(&ndev
->dev
, addr
)) {
281 netdev_err(ndev
, "cannot dma map\n");
282 dev_kfree_skb(rx_buff
->skb
);
286 dma_unmap_addr_set(rx_buff
, addr
, addr
);
287 dma_unmap_len_set(rx_buff
, len
, EMAC_BUFFER_SIZE
);
289 rxbd
->data
= cpu_to_le32(addr
);
291 /* Make sure pointer to data buffer is set */
294 /* Return ownership to EMAC */
295 rxbd
->info
= cpu_to_le32(FOR_EMAC
| EMAC_BUFFER_SIZE
);
302 * arc_emac_poll - NAPI poll handler.
303 * @napi: Pointer to napi_struct structure.
304 * @budget: How many BDs to process on 1 call.
306 * returns: Number of processed BDs
308 static int arc_emac_poll(struct napi_struct
*napi
, int budget
)
310 struct net_device
*ndev
= napi
->dev
;
311 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
312 unsigned int work_done
;
314 arc_emac_tx_clean(ndev
);
316 work_done
= arc_emac_rx(ndev
, budget
);
317 if (work_done
< budget
) {
319 arc_reg_or(priv
, R_ENABLE
, RXINT_MASK
| TXINT_MASK
);
326 * arc_emac_intr - Global interrupt handler for EMAC.
328 * @dev_instance: device instance.
330 * returns: IRQ_HANDLED for all cases.
332 * ARC EMAC has only 1 interrupt line, and depending on bits raised in
333 * STATUS register we may tell what is a reason for interrupt to fire.
335 static irqreturn_t
arc_emac_intr(int irq
, void *dev_instance
)
337 struct net_device
*ndev
= dev_instance
;
338 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
339 struct net_device_stats
*stats
= &ndev
->stats
;
342 status
= arc_reg_get(priv
, R_STATUS
);
343 status
&= ~MDIO_MASK
;
345 /* Reset all flags except "MDIO complete" */
346 arc_reg_set(priv
, R_STATUS
, status
);
348 if (status
& (RXINT_MASK
| TXINT_MASK
)) {
349 if (likely(napi_schedule_prep(&priv
->napi
))) {
350 arc_reg_clr(priv
, R_ENABLE
, RXINT_MASK
| TXINT_MASK
);
351 __napi_schedule(&priv
->napi
);
355 if (status
& ERR_MASK
) {
356 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
357 * 8-bit error counter overrun.
360 if (status
& MSER_MASK
) {
361 stats
->rx_missed_errors
+= 0x100;
362 stats
->rx_errors
+= 0x100;
365 if (status
& RXCR_MASK
) {
366 stats
->rx_crc_errors
+= 0x100;
367 stats
->rx_errors
+= 0x100;
370 if (status
& RXFR_MASK
) {
371 stats
->rx_frame_errors
+= 0x100;
372 stats
->rx_errors
+= 0x100;
375 if (status
& RXFL_MASK
) {
376 stats
->rx_over_errors
+= 0x100;
377 stats
->rx_errors
+= 0x100;
384 #ifdef CONFIG_NET_POLL_CONTROLLER
385 static void arc_emac_poll_controller(struct net_device
*dev
)
387 disable_irq(dev
->irq
);
388 arc_emac_intr(dev
->irq
, dev
);
389 enable_irq(dev
->irq
);
394 * arc_emac_open - Open the network device.
395 * @ndev: Pointer to the network device.
397 * returns: 0, on success or non-zero error value on failure.
399 * This function sets the MAC address, requests and enables an IRQ
400 * for the EMAC device and starts the Tx queue.
401 * It also connects to the phy device.
403 static int arc_emac_open(struct net_device
*ndev
)
405 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
406 struct phy_device
*phy_dev
= priv
->phy_dev
;
409 phy_dev
->autoneg
= AUTONEG_ENABLE
;
412 phy_dev
->advertising
&= phy_dev
->supported
;
414 priv
->last_rx_bd
= 0;
416 /* Allocate and set buffers for Rx BD's */
417 for (i
= 0; i
< RX_BD_NUM
; i
++) {
419 unsigned int *last_rx_bd
= &priv
->last_rx_bd
;
420 struct arc_emac_bd
*rxbd
= &priv
->rxbd
[*last_rx_bd
];
421 struct buffer_state
*rx_buff
= &priv
->rx_buff
[*last_rx_bd
];
423 rx_buff
->skb
= netdev_alloc_skb_ip_align(ndev
,
425 if (unlikely(!rx_buff
->skb
))
428 addr
= dma_map_single(&ndev
->dev
, (void *)rx_buff
->skb
->data
,
429 EMAC_BUFFER_SIZE
, DMA_FROM_DEVICE
);
430 if (dma_mapping_error(&ndev
->dev
, addr
)) {
431 netdev_err(ndev
, "cannot dma map\n");
432 dev_kfree_skb(rx_buff
->skb
);
435 dma_unmap_addr_set(rx_buff
, addr
, addr
);
436 dma_unmap_len_set(rx_buff
, len
, EMAC_BUFFER_SIZE
);
438 rxbd
->data
= cpu_to_le32(addr
);
440 /* Make sure pointer to data buffer is set */
443 /* Return ownership to EMAC */
444 rxbd
->info
= cpu_to_le32(FOR_EMAC
| EMAC_BUFFER_SIZE
);
446 *last_rx_bd
= (*last_rx_bd
+ 1) % RX_BD_NUM
;
450 priv
->txbd_dirty
= 0;
453 memset(priv
->txbd
, 0, TX_RING_SZ
);
455 /* Initialize logical address filter */
456 arc_reg_set(priv
, R_LAFL
, 0);
457 arc_reg_set(priv
, R_LAFH
, 0);
459 /* Set BD ring pointers for device side */
460 arc_reg_set(priv
, R_RX_RING
, (unsigned int)priv
->rxbd_dma
);
461 arc_reg_set(priv
, R_TX_RING
, (unsigned int)priv
->txbd_dma
);
463 /* Enable interrupts */
464 arc_reg_set(priv
, R_ENABLE
, RXINT_MASK
| TXINT_MASK
| ERR_MASK
);
467 arc_reg_set(priv
, R_CTRL
,
468 (RX_BD_NUM
<< 24) | /* RX BD table length */
469 (TX_BD_NUM
<< 16) | /* TX BD table length */
470 TXRN_MASK
| RXRN_MASK
);
472 napi_enable(&priv
->napi
);
475 arc_reg_or(priv
, R_CTRL
, EN_MASK
);
477 phy_start_aneg(priv
->phy_dev
);
479 netif_start_queue(ndev
);
485 * arc_emac_set_rx_mode - Change the receive filtering mode.
486 * @ndev: Pointer to the network device.
488 * This function enables/disables promiscuous or all-multicast mode
489 * and updates the multicast filtering list of the network device.
491 static void arc_emac_set_rx_mode(struct net_device
*ndev
)
493 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
495 if (ndev
->flags
& IFF_PROMISC
) {
496 arc_reg_or(priv
, R_CTRL
, PROM_MASK
);
498 arc_reg_clr(priv
, R_CTRL
, PROM_MASK
);
500 if (ndev
->flags
& IFF_ALLMULTI
) {
501 arc_reg_set(priv
, R_LAFL
, ~0);
502 arc_reg_set(priv
, R_LAFH
, ~0);
504 struct netdev_hw_addr
*ha
;
505 unsigned int filter
[2] = { 0, 0 };
508 netdev_for_each_mc_addr(ha
, ndev
) {
509 bit
= ether_crc_le(ETH_ALEN
, ha
->addr
) >> 26;
510 filter
[bit
>> 5] |= 1 << (bit
& 31);
513 arc_reg_set(priv
, R_LAFL
, filter
[0]);
514 arc_reg_set(priv
, R_LAFH
, filter
[1]);
520 * arc_free_tx_queue - free skb from tx queue
521 * @ndev: Pointer to the network device.
523 * This function must be called while EMAC disable
525 static void arc_free_tx_queue(struct net_device
*ndev
)
527 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
530 for (i
= 0; i
< TX_BD_NUM
; i
++) {
531 struct arc_emac_bd
*txbd
= &priv
->txbd
[i
];
532 struct buffer_state
*tx_buff
= &priv
->tx_buff
[i
];
535 dma_unmap_single(&ndev
->dev
,
536 dma_unmap_addr(tx_buff
, addr
),
537 dma_unmap_len(tx_buff
, len
),
540 /* return the sk_buff to system */
541 dev_kfree_skb_irq(tx_buff
->skb
);
551 * arc_free_rx_queue - free skb from rx queue
552 * @ndev: Pointer to the network device.
554 * This function must be called while EMAC disable
556 static void arc_free_rx_queue(struct net_device
*ndev
)
558 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
561 for (i
= 0; i
< RX_BD_NUM
; i
++) {
562 struct arc_emac_bd
*rxbd
= &priv
->rxbd
[i
];
563 struct buffer_state
*rx_buff
= &priv
->rx_buff
[i
];
566 dma_unmap_single(&ndev
->dev
,
567 dma_unmap_addr(rx_buff
, addr
),
568 dma_unmap_len(rx_buff
, len
),
571 /* return the sk_buff to system */
572 dev_kfree_skb_irq(rx_buff
->skb
);
582 * arc_emac_stop - Close the network device.
583 * @ndev: Pointer to the network device.
585 * This function stops the Tx queue, disables interrupts and frees the IRQ for
587 * It also disconnects the PHY device associated with the EMAC device.
589 static int arc_emac_stop(struct net_device
*ndev
)
591 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
593 napi_disable(&priv
->napi
);
594 netif_stop_queue(ndev
);
596 /* Disable interrupts */
597 arc_reg_clr(priv
, R_ENABLE
, RXINT_MASK
| TXINT_MASK
| ERR_MASK
);
600 arc_reg_clr(priv
, R_CTRL
, EN_MASK
);
602 /* Return the sk_buff to system */
603 arc_free_tx_queue(ndev
);
604 arc_free_rx_queue(ndev
);
610 * arc_emac_stats - Get system network statistics.
611 * @ndev: Pointer to net_device structure.
613 * Returns the address of the device statistics structure.
614 * Statistics are updated in interrupt handler.
616 static struct net_device_stats
*arc_emac_stats(struct net_device
*ndev
)
618 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
619 struct net_device_stats
*stats
= &ndev
->stats
;
620 unsigned long miss
, rxerr
;
621 u8 rxcrc
, rxfram
, rxoflow
;
623 rxerr
= arc_reg_get(priv
, R_RXERR
);
624 miss
= arc_reg_get(priv
, R_MISS
);
628 rxoflow
= rxerr
>> 16;
630 stats
->rx_errors
+= miss
;
631 stats
->rx_errors
+= rxcrc
+ rxfram
+ rxoflow
;
633 stats
->rx_over_errors
+= rxoflow
;
634 stats
->rx_frame_errors
+= rxfram
;
635 stats
->rx_crc_errors
+= rxcrc
;
636 stats
->rx_missed_errors
+= miss
;
642 * arc_emac_tx - Starts the data transmission.
643 * @skb: sk_buff pointer that contains data to be Transmitted.
644 * @ndev: Pointer to net_device structure.
646 * returns: NETDEV_TX_OK, on success
647 * NETDEV_TX_BUSY, if any of the descriptors are not free.
649 * This function is invoked from upper layers to initiate transmission.
651 static int arc_emac_tx(struct sk_buff
*skb
, struct net_device
*ndev
)
653 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
654 unsigned int len
, *txbd_curr
= &priv
->txbd_curr
;
655 struct net_device_stats
*stats
= &ndev
->stats
;
656 __le32
*info
= &priv
->txbd
[*txbd_curr
].info
;
659 if (skb_padto(skb
, ETH_ZLEN
))
662 len
= max_t(unsigned int, ETH_ZLEN
, skb
->len
);
664 if (unlikely(!arc_emac_tx_avail(priv
))) {
665 netif_stop_queue(ndev
);
666 netdev_err(ndev
, "BUG! Tx Ring full when queue awake!\n");
667 return NETDEV_TX_BUSY
;
670 addr
= dma_map_single(&ndev
->dev
, (void *)skb
->data
, len
,
673 if (unlikely(dma_mapping_error(&ndev
->dev
, addr
))) {
679 dma_unmap_addr_set(&priv
->tx_buff
[*txbd_curr
], addr
, addr
);
680 dma_unmap_len_set(&priv
->tx_buff
[*txbd_curr
], len
, len
);
682 priv
->txbd
[*txbd_curr
].data
= cpu_to_le32(addr
);
684 /* Make sure pointer to data buffer is set */
687 skb_tx_timestamp(skb
);
689 *info
= cpu_to_le32(FOR_EMAC
| FIRST_OR_LAST_MASK
| len
);
691 /* Make sure info word is set */
694 priv
->tx_buff
[*txbd_curr
].skb
= skb
;
696 /* Increment index to point to the next BD */
697 *txbd_curr
= (*txbd_curr
+ 1) % TX_BD_NUM
;
699 /* Ensure that tx_clean() sees the new txbd_curr before
700 * checking the queue status. This prevents an unneeded wake
701 * of the queue in tx_clean().
705 if (!arc_emac_tx_avail(priv
)) {
706 netif_stop_queue(ndev
);
707 /* Refresh tx_dirty */
709 if (arc_emac_tx_avail(priv
))
710 netif_start_queue(ndev
);
713 arc_reg_set(priv
, R_STATUS
, TXPL_MASK
);
718 static void arc_emac_set_address_internal(struct net_device
*ndev
)
720 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
721 unsigned int addr_low
, addr_hi
;
723 addr_low
= le32_to_cpu(*(__le32
*)&ndev
->dev_addr
[0]);
724 addr_hi
= le16_to_cpu(*(__le16
*)&ndev
->dev_addr
[4]);
726 arc_reg_set(priv
, R_ADDRL
, addr_low
);
727 arc_reg_set(priv
, R_ADDRH
, addr_hi
);
731 * arc_emac_set_address - Set the MAC address for this device.
732 * @ndev: Pointer to net_device structure.
733 * @p: 6 byte Address to be written as MAC address.
735 * This function copies the HW address from the sockaddr structure to the
736 * net_device structure and updates the address in HW.
738 * returns: -EBUSY if the net device is busy or 0 if the address is set
741 static int arc_emac_set_address(struct net_device
*ndev
, void *p
)
743 struct sockaddr
*addr
= p
;
745 if (netif_running(ndev
))
748 if (!is_valid_ether_addr(addr
->sa_data
))
749 return -EADDRNOTAVAIL
;
751 memcpy(ndev
->dev_addr
, addr
->sa_data
, ndev
->addr_len
);
753 arc_emac_set_address_internal(ndev
);
758 static const struct net_device_ops arc_emac_netdev_ops
= {
759 .ndo_open
= arc_emac_open
,
760 .ndo_stop
= arc_emac_stop
,
761 .ndo_start_xmit
= arc_emac_tx
,
762 .ndo_set_mac_address
= arc_emac_set_address
,
763 .ndo_get_stats
= arc_emac_stats
,
764 .ndo_set_rx_mode
= arc_emac_set_rx_mode
,
765 #ifdef CONFIG_NET_POLL_CONTROLLER
766 .ndo_poll_controller
= arc_emac_poll_controller
,
770 int arc_emac_probe(struct net_device
*ndev
, int interface
)
772 struct device
*dev
= ndev
->dev
.parent
;
773 struct resource res_regs
;
774 struct device_node
*phy_node
;
775 struct arc_emac_priv
*priv
;
776 const char *mac_addr
;
777 unsigned int id
, clock_frequency
, irq
;
780 /* Get PHY from device tree */
781 phy_node
= of_parse_phandle(dev
->of_node
, "phy", 0);
783 dev_err(dev
, "failed to retrieve phy description from device tree\n");
787 /* Get EMAC registers base address from device tree */
788 err
= of_address_to_resource(dev
->of_node
, 0, &res_regs
);
790 dev_err(dev
, "failed to retrieve registers base from device tree\n");
794 /* Get IRQ from device tree */
795 irq
= irq_of_parse_and_map(dev
->of_node
, 0);
797 dev_err(dev
, "failed to retrieve <irq> value from device tree\n");
801 ndev
->netdev_ops
= &arc_emac_netdev_ops
;
802 ndev
->ethtool_ops
= &arc_emac_ethtool_ops
;
803 ndev
->watchdog_timeo
= TX_TIMEOUT
;
804 /* FIXME :: no multicast support yet */
805 ndev
->flags
&= ~IFF_MULTICAST
;
807 priv
= netdev_priv(ndev
);
810 priv
->regs
= devm_ioremap_resource(dev
, &res_regs
);
811 if (IS_ERR(priv
->regs
))
812 return PTR_ERR(priv
->regs
);
814 dev_dbg(dev
, "Registers base address is 0x%p\n", priv
->regs
);
817 err
= clk_prepare_enable(priv
->clk
);
819 dev_err(dev
, "failed to enable clock\n");
823 clock_frequency
= clk_get_rate(priv
->clk
);
825 /* Get CPU clock frequency from device tree */
826 if (of_property_read_u32(dev
->of_node
, "clock-frequency",
828 dev_err(dev
, "failed to retrieve <clock-frequency> from device tree\n");
833 id
= arc_reg_get(priv
, R_ID
);
835 /* Check for EMAC revision 5 or 7, magic number */
836 if (!(id
== 0x0005fd02 || id
== 0x0007fd02)) {
837 dev_err(dev
, "ARC EMAC not detected, id=0x%x\n", id
);
841 dev_info(dev
, "ARC EMAC detected with id: 0x%x\n", id
);
843 /* Set poll rate so that it polls every 1 ms */
844 arc_reg_set(priv
, R_POLLRATE
, clock_frequency
/ 1000000);
847 dev_info(dev
, "IRQ is %d\n", ndev
->irq
);
849 /* Register interrupt handler for device */
850 err
= devm_request_irq(dev
, ndev
->irq
, arc_emac_intr
, 0,
853 dev_err(dev
, "could not allocate IRQ\n");
857 /* Get MAC address from device tree */
858 mac_addr
= of_get_mac_address(dev
->of_node
);
861 memcpy(ndev
->dev_addr
, mac_addr
, ETH_ALEN
);
863 eth_hw_addr_random(ndev
);
865 arc_emac_set_address_internal(ndev
);
866 dev_info(dev
, "MAC address is now %pM\n", ndev
->dev_addr
);
868 /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
869 priv
->rxbd
= dmam_alloc_coherent(dev
, RX_RING_SZ
+ TX_RING_SZ
,
870 &priv
->rxbd_dma
, GFP_KERNEL
);
873 dev_err(dev
, "failed to allocate data buffers\n");
878 priv
->txbd
= priv
->rxbd
+ RX_BD_NUM
;
880 priv
->txbd_dma
= priv
->rxbd_dma
+ RX_RING_SZ
;
881 dev_dbg(dev
, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
882 (unsigned int)priv
->rxbd_dma
, (unsigned int)priv
->txbd_dma
);
884 err
= arc_mdio_probe(priv
);
886 dev_err(dev
, "failed to probe MII bus\n");
890 priv
->phy_dev
= of_phy_connect(ndev
, phy_node
, arc_emac_adjust_link
, 0,
892 if (!priv
->phy_dev
) {
893 dev_err(dev
, "of_phy_connect() failed\n");
898 dev_info(dev
, "connected to %s phy with id 0x%x\n",
899 priv
->phy_dev
->drv
->name
, priv
->phy_dev
->phy_id
);
901 netif_napi_add(ndev
, &priv
->napi
, arc_emac_poll
, ARC_EMAC_NAPI_WEIGHT
);
903 err
= register_netdev(ndev
);
905 dev_err(dev
, "failed to register network device\n");
912 netif_napi_del(&priv
->napi
);
913 phy_disconnect(priv
->phy_dev
);
914 priv
->phy_dev
= NULL
;
916 arc_mdio_remove(priv
);
919 clk_disable_unprepare(priv
->clk
);
922 EXPORT_SYMBOL_GPL(arc_emac_probe
);
924 int arc_emac_remove(struct net_device
*ndev
)
926 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
928 phy_disconnect(priv
->phy_dev
);
929 priv
->phy_dev
= NULL
;
930 arc_mdio_remove(priv
);
931 unregister_netdev(ndev
);
932 netif_napi_del(&priv
->napi
);
934 if (!IS_ERR(priv
->clk
))
935 clk_disable_unprepare(priv
->clk
);
939 EXPORT_SYMBOL_GPL(arc_emac_remove
);
941 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
942 MODULE_DESCRIPTION("ARC EMAC driver");
943 MODULE_LICENSE("GPL");