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");