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>
29 #define DRV_NAME "arc_emac"
30 #define DRV_VERSION "1.0"
33 * arc_emac_adjust_link - Adjust the PHY link duplex.
34 * @ndev: Pointer to the net_device structure.
36 * This function is called to change the duplex setting after auto negotiation
39 static void arc_emac_adjust_link(struct net_device
*ndev
)
41 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
42 struct phy_device
*phy_dev
= priv
->phy_dev
;
43 unsigned int reg
, state_changed
= 0;
45 if (priv
->link
!= phy_dev
->link
) {
46 priv
->link
= phy_dev
->link
;
50 if (priv
->speed
!= phy_dev
->speed
) {
51 priv
->speed
= phy_dev
->speed
;
55 if (priv
->duplex
!= phy_dev
->duplex
) {
56 reg
= arc_reg_get(priv
, R_CTRL
);
58 if (DUPLEX_FULL
== phy_dev
->duplex
)
63 arc_reg_set(priv
, R_CTRL
, reg
);
64 priv
->duplex
= phy_dev
->duplex
;
69 phy_print_status(phy_dev
);
73 * arc_emac_get_settings - Get PHY settings.
74 * @ndev: Pointer to net_device structure.
75 * @cmd: Pointer to ethtool_cmd structure.
77 * This implements ethtool command for getting PHY settings. If PHY could
78 * not be found, the function returns -ENODEV. This function calls the
79 * relevant PHY ethtool API to get the PHY settings.
80 * Issue "ethtool ethX" under linux prompt to execute this function.
82 static int arc_emac_get_settings(struct net_device
*ndev
,
83 struct ethtool_cmd
*cmd
)
85 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
87 return phy_ethtool_gset(priv
->phy_dev
, cmd
);
91 * arc_emac_set_settings - Set PHY settings as passed in the argument.
92 * @ndev: Pointer to net_device structure.
93 * @cmd: Pointer to ethtool_cmd structure.
95 * This implements ethtool command for setting various PHY settings. If PHY
96 * could not be found, the function returns -ENODEV. This function calls the
97 * relevant PHY ethtool API to set the PHY.
98 * Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this
101 static int arc_emac_set_settings(struct net_device
*ndev
,
102 struct ethtool_cmd
*cmd
)
104 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
106 if (!capable(CAP_NET_ADMIN
))
109 return phy_ethtool_sset(priv
->phy_dev
, cmd
);
113 * arc_emac_get_drvinfo - Get EMAC driver information.
114 * @ndev: Pointer to net_device structure.
115 * @info: Pointer to ethtool_drvinfo structure.
117 * This implements ethtool command for getting the driver information.
118 * Issue "ethtool -i ethX" under linux prompt to execute this function.
120 static void arc_emac_get_drvinfo(struct net_device
*ndev
,
121 struct ethtool_drvinfo
*info
)
123 strlcpy(info
->driver
, DRV_NAME
, sizeof(info
->driver
));
124 strlcpy(info
->version
, DRV_VERSION
, sizeof(info
->version
));
127 static const struct ethtool_ops arc_emac_ethtool_ops
= {
128 .get_settings
= arc_emac_get_settings
,
129 .set_settings
= arc_emac_set_settings
,
130 .get_drvinfo
= arc_emac_get_drvinfo
,
131 .get_link
= ethtool_op_get_link
,
134 #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK)
137 * arc_emac_tx_clean - clears processed by EMAC Tx BDs.
138 * @ndev: Pointer to the network device.
140 static void arc_emac_tx_clean(struct net_device
*ndev
)
142 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
143 struct net_device_stats
*stats
= &ndev
->stats
;
146 for (i
= 0; i
< TX_BD_NUM
; i
++) {
147 unsigned int *txbd_dirty
= &priv
->txbd_dirty
;
148 struct arc_emac_bd
*txbd
= &priv
->txbd
[*txbd_dirty
];
149 struct buffer_state
*tx_buff
= &priv
->tx_buff
[*txbd_dirty
];
150 struct sk_buff
*skb
= tx_buff
->skb
;
151 unsigned int info
= le32_to_cpu(txbd
->info
);
153 if ((info
& FOR_EMAC
) || !txbd
->data
)
156 if (unlikely(info
& (DROP
| DEFR
| LTCL
| UFLO
))) {
161 stats
->tx_carrier_errors
++;
167 stats
->tx_fifo_errors
++;
168 } else if (likely(info
& FIRST_OR_LAST_MASK
)) {
170 stats
->tx_bytes
+= skb
->len
;
173 dma_unmap_single(&ndev
->dev
, dma_unmap_addr(tx_buff
, addr
),
174 dma_unmap_len(tx_buff
, len
), DMA_TO_DEVICE
);
176 /* return the sk_buff to system */
177 dev_kfree_skb_irq(skb
);
182 *txbd_dirty
= (*txbd_dirty
+ 1) % TX_BD_NUM
;
184 if (netif_queue_stopped(ndev
))
185 netif_wake_queue(ndev
);
190 * arc_emac_rx - processing of Rx packets.
191 * @ndev: Pointer to the network device.
192 * @budget: How many BDs to process on 1 call.
194 * returns: Number of processed BDs
196 * Iterate through Rx BDs and deliver received packages to upper layer.
198 static int arc_emac_rx(struct net_device
*ndev
, int budget
)
200 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
201 unsigned int work_done
;
203 for (work_done
= 0; work_done
< budget
; work_done
++) {
204 unsigned int *last_rx_bd
= &priv
->last_rx_bd
;
205 struct net_device_stats
*stats
= &ndev
->stats
;
206 struct buffer_state
*rx_buff
= &priv
->rx_buff
[*last_rx_bd
];
207 struct arc_emac_bd
*rxbd
= &priv
->rxbd
[*last_rx_bd
];
208 unsigned int pktlen
, info
= le32_to_cpu(rxbd
->info
);
212 if (unlikely((info
& OWN_MASK
) == FOR_EMAC
))
215 /* Make a note that we saw a packet at this BD.
216 * So next time, driver starts from this + 1
218 *last_rx_bd
= (*last_rx_bd
+ 1) % RX_BD_NUM
;
220 if (unlikely((info
& FIRST_OR_LAST_MASK
) !=
221 FIRST_OR_LAST_MASK
)) {
222 /* We pre-allocate buffers of MTU size so incoming
223 * packets won't be split/chained.
226 netdev_err(ndev
, "incomplete packet received\n");
228 /* Return ownership to EMAC */
229 rxbd
->info
= cpu_to_le32(FOR_EMAC
| EMAC_BUFFER_SIZE
);
231 stats
->rx_length_errors
++;
235 pktlen
= info
& LEN_MASK
;
237 stats
->rx_bytes
+= pktlen
;
239 skb_put(skb
, pktlen
);
241 skb
->protocol
= eth_type_trans(skb
, ndev
);
243 dma_unmap_single(&ndev
->dev
, dma_unmap_addr(rx_buff
, addr
),
244 dma_unmap_len(rx_buff
, len
), DMA_FROM_DEVICE
);
246 /* Prepare the BD for next cycle */
247 rx_buff
->skb
= netdev_alloc_skb_ip_align(ndev
,
249 if (unlikely(!rx_buff
->skb
)) {
251 /* Because receive_skb is below, increment rx_dropped */
256 /* receive_skb only if new skb was allocated to avoid holes */
257 netif_receive_skb(skb
);
259 addr
= dma_map_single(&ndev
->dev
, (void *)rx_buff
->skb
->data
,
260 EMAC_BUFFER_SIZE
, DMA_FROM_DEVICE
);
261 if (dma_mapping_error(&ndev
->dev
, addr
)) {
263 netdev_err(ndev
, "cannot dma map\n");
264 dev_kfree_skb(rx_buff
->skb
);
268 dma_unmap_addr_set(rx_buff
, addr
, addr
);
269 dma_unmap_len_set(rx_buff
, len
, EMAC_BUFFER_SIZE
);
271 rxbd
->data
= cpu_to_le32(addr
);
273 /* Make sure pointer to data buffer is set */
276 /* Return ownership to EMAC */
277 rxbd
->info
= cpu_to_le32(FOR_EMAC
| EMAC_BUFFER_SIZE
);
284 * arc_emac_poll - NAPI poll handler.
285 * @napi: Pointer to napi_struct structure.
286 * @budget: How many BDs to process on 1 call.
288 * returns: Number of processed BDs
290 static int arc_emac_poll(struct napi_struct
*napi
, int budget
)
292 struct net_device
*ndev
= napi
->dev
;
293 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
294 unsigned int work_done
;
296 arc_emac_tx_clean(ndev
);
298 work_done
= arc_emac_rx(ndev
, budget
);
299 if (work_done
< budget
) {
301 arc_reg_or(priv
, R_ENABLE
, RXINT_MASK
);
308 * arc_emac_intr - Global interrupt handler for EMAC.
310 * @dev_instance: device instance.
312 * returns: IRQ_HANDLED for all cases.
314 * ARC EMAC has only 1 interrupt line, and depending on bits raised in
315 * STATUS register we may tell what is a reason for interrupt to fire.
317 static irqreturn_t
arc_emac_intr(int irq
, void *dev_instance
)
319 struct net_device
*ndev
= dev_instance
;
320 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
321 struct net_device_stats
*stats
= &ndev
->stats
;
324 status
= arc_reg_get(priv
, R_STATUS
);
325 status
&= ~MDIO_MASK
;
327 /* Reset all flags except "MDIO complete" */
328 arc_reg_set(priv
, R_STATUS
, status
);
330 if (status
& RXINT_MASK
) {
331 if (likely(napi_schedule_prep(&priv
->napi
))) {
332 arc_reg_clr(priv
, R_ENABLE
, RXINT_MASK
);
333 __napi_schedule(&priv
->napi
);
337 if (status
& ERR_MASK
) {
338 /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
339 * 8-bit error counter overrun.
342 if (status
& MSER_MASK
) {
343 stats
->rx_missed_errors
+= 0x100;
344 stats
->rx_errors
+= 0x100;
347 if (status
& RXCR_MASK
) {
348 stats
->rx_crc_errors
+= 0x100;
349 stats
->rx_errors
+= 0x100;
352 if (status
& RXFR_MASK
) {
353 stats
->rx_frame_errors
+= 0x100;
354 stats
->rx_errors
+= 0x100;
357 if (status
& RXFL_MASK
) {
358 stats
->rx_over_errors
+= 0x100;
359 stats
->rx_errors
+= 0x100;
366 #ifdef CONFIG_NET_POLL_CONTROLLER
367 static void arc_emac_poll_controller(struct net_device
*dev
)
369 disable_irq(dev
->irq
);
370 arc_emac_intr(dev
->irq
, dev
);
371 enable_irq(dev
->irq
);
376 * arc_emac_open - Open the network device.
377 * @ndev: Pointer to the network device.
379 * returns: 0, on success or non-zero error value on failure.
381 * This function sets the MAC address, requests and enables an IRQ
382 * for the EMAC device and starts the Tx queue.
383 * It also connects to the phy device.
385 static int arc_emac_open(struct net_device
*ndev
)
387 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
388 struct phy_device
*phy_dev
= priv
->phy_dev
;
391 phy_dev
->autoneg
= AUTONEG_ENABLE
;
394 phy_dev
->advertising
&= phy_dev
->supported
;
396 priv
->last_rx_bd
= 0;
398 /* Allocate and set buffers for Rx BD's */
399 for (i
= 0; i
< RX_BD_NUM
; i
++) {
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
,
407 if (unlikely(!rx_buff
->skb
))
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
);
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 */
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
;
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
);
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
);
454 arc_reg_or(priv
, R_CTRL
, EN_MASK
);
456 phy_start_aneg(priv
->phy_dev
);
458 netif_start_queue(ndev
);
464 * arc_emac_set_rx_mode - Change the receive filtering mode.
465 * @ndev: Pointer to the network device.
467 * This function enables/disables promiscuous or all-multicast mode
468 * and updates the multicast filtering list of the network device.
470 static void arc_emac_set_rx_mode(struct net_device
*ndev
)
472 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
474 if (ndev
->flags
& IFF_PROMISC
) {
475 arc_reg_or(priv
, R_CTRL
, PROM_MASK
);
477 arc_reg_clr(priv
, R_CTRL
, PROM_MASK
);
479 if (ndev
->flags
& IFF_ALLMULTI
) {
480 arc_reg_set(priv
, R_LAFL
, ~0);
481 arc_reg_set(priv
, R_LAFH
, ~0);
483 struct netdev_hw_addr
*ha
;
484 unsigned int filter
[2] = { 0, 0 };
487 netdev_for_each_mc_addr(ha
, ndev
) {
488 bit
= ether_crc_le(ETH_ALEN
, ha
->addr
) >> 26;
489 filter
[bit
>> 5] |= 1 << (bit
& 31);
492 arc_reg_set(priv
, R_LAFL
, filter
[0]);
493 arc_reg_set(priv
, R_LAFH
, filter
[1]);
499 * arc_emac_stop - Close the network device.
500 * @ndev: Pointer to the network device.
502 * This function stops the Tx queue, disables interrupts and frees the IRQ for
504 * It also disconnects the PHY device associated with the EMAC device.
506 static int arc_emac_stop(struct net_device
*ndev
)
508 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
510 napi_disable(&priv
->napi
);
511 netif_stop_queue(ndev
);
513 /* Disable interrupts */
514 arc_reg_clr(priv
, R_ENABLE
, RXINT_MASK
| ERR_MASK
);
517 arc_reg_clr(priv
, R_CTRL
, EN_MASK
);
523 * arc_emac_stats - Get system network statistics.
524 * @ndev: Pointer to net_device structure.
526 * Returns the address of the device statistics structure.
527 * Statistics are updated in interrupt handler.
529 static struct net_device_stats
*arc_emac_stats(struct net_device
*ndev
)
531 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
532 struct net_device_stats
*stats
= &ndev
->stats
;
533 unsigned long miss
, rxerr
;
534 u8 rxcrc
, rxfram
, rxoflow
;
536 rxerr
= arc_reg_get(priv
, R_RXERR
);
537 miss
= arc_reg_get(priv
, R_MISS
);
541 rxoflow
= rxerr
>> 16;
543 stats
->rx_errors
+= miss
;
544 stats
->rx_errors
+= rxcrc
+ rxfram
+ rxoflow
;
546 stats
->rx_over_errors
+= rxoflow
;
547 stats
->rx_frame_errors
+= rxfram
;
548 stats
->rx_crc_errors
+= rxcrc
;
549 stats
->rx_missed_errors
+= miss
;
555 * arc_emac_tx - Starts the data transmission.
556 * @skb: sk_buff pointer that contains data to be Transmitted.
557 * @ndev: Pointer to net_device structure.
559 * returns: NETDEV_TX_OK, on success
560 * NETDEV_TX_BUSY, if any of the descriptors are not free.
562 * This function is invoked from upper layers to initiate transmission.
564 static int arc_emac_tx(struct sk_buff
*skb
, struct net_device
*ndev
)
566 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
567 unsigned int len
, *txbd_curr
= &priv
->txbd_curr
;
568 struct net_device_stats
*stats
= &ndev
->stats
;
569 __le32
*info
= &priv
->txbd
[*txbd_curr
].info
;
572 if (skb_padto(skb
, ETH_ZLEN
))
575 len
= max_t(unsigned int, ETH_ZLEN
, skb
->len
);
577 /* EMAC still holds this buffer in its possession.
578 * CPU must not modify this buffer descriptor
580 if (unlikely((le32_to_cpu(*info
) & OWN_MASK
) == FOR_EMAC
)) {
581 netif_stop_queue(ndev
);
582 return NETDEV_TX_BUSY
;
585 addr
= dma_map_single(&ndev
->dev
, (void *)skb
->data
, len
,
588 if (unlikely(dma_mapping_error(&ndev
->dev
, addr
))) {
594 dma_unmap_addr_set(&priv
->tx_buff
[*txbd_curr
], addr
, addr
);
595 dma_unmap_len_set(&priv
->tx_buff
[*txbd_curr
], len
, len
);
597 priv
->tx_buff
[*txbd_curr
].skb
= skb
;
598 priv
->txbd
[*txbd_curr
].data
= cpu_to_le32(addr
);
600 /* Make sure pointer to data buffer is set */
603 skb_tx_timestamp(skb
);
605 *info
= cpu_to_le32(FOR_EMAC
| FIRST_OR_LAST_MASK
| len
);
607 /* Increment index to point to the next BD */
608 *txbd_curr
= (*txbd_curr
+ 1) % TX_BD_NUM
;
610 /* Get "info" of the next BD */
611 info
= &priv
->txbd
[*txbd_curr
].info
;
613 /* Check if if Tx BD ring is full - next BD is still owned by EMAC */
614 if (unlikely((le32_to_cpu(*info
) & OWN_MASK
) == FOR_EMAC
))
615 netif_stop_queue(ndev
);
617 arc_reg_set(priv
, R_STATUS
, TXPL_MASK
);
622 static void arc_emac_set_address_internal(struct net_device
*ndev
)
624 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
625 unsigned int addr_low
, addr_hi
;
627 addr_low
= le32_to_cpu(*(__le32
*) &ndev
->dev_addr
[0]);
628 addr_hi
= le16_to_cpu(*(__le16
*) &ndev
->dev_addr
[4]);
630 arc_reg_set(priv
, R_ADDRL
, addr_low
);
631 arc_reg_set(priv
, R_ADDRH
, addr_hi
);
635 * arc_emac_set_address - Set the MAC address for this device.
636 * @ndev: Pointer to net_device structure.
637 * @p: 6 byte Address to be written as MAC address.
639 * This function copies the HW address from the sockaddr structure to the
640 * net_device structure and updates the address in HW.
642 * returns: -EBUSY if the net device is busy or 0 if the address is set
645 static int arc_emac_set_address(struct net_device
*ndev
, void *p
)
647 struct sockaddr
*addr
= p
;
649 if (netif_running(ndev
))
652 if (!is_valid_ether_addr(addr
->sa_data
))
653 return -EADDRNOTAVAIL
;
655 memcpy(ndev
->dev_addr
, addr
->sa_data
, ndev
->addr_len
);
657 arc_emac_set_address_internal(ndev
);
662 static const struct net_device_ops arc_emac_netdev_ops
= {
663 .ndo_open
= arc_emac_open
,
664 .ndo_stop
= arc_emac_stop
,
665 .ndo_start_xmit
= arc_emac_tx
,
666 .ndo_set_mac_address
= arc_emac_set_address
,
667 .ndo_get_stats
= arc_emac_stats
,
668 .ndo_set_rx_mode
= arc_emac_set_rx_mode
,
669 #ifdef CONFIG_NET_POLL_CONTROLLER
670 .ndo_poll_controller
= arc_emac_poll_controller
,
674 static int arc_emac_probe(struct platform_device
*pdev
)
676 struct resource res_regs
;
677 struct device_node
*phy_node
;
678 struct arc_emac_priv
*priv
;
679 struct net_device
*ndev
;
680 const char *mac_addr
;
681 unsigned int id
, clock_frequency
, irq
;
684 if (!pdev
->dev
.of_node
)
687 /* Get PHY from device tree */
688 phy_node
= of_parse_phandle(pdev
->dev
.of_node
, "phy", 0);
690 dev_err(&pdev
->dev
, "failed to retrieve phy description from device tree\n");
694 /* Get EMAC registers base address from device tree */
695 err
= of_address_to_resource(pdev
->dev
.of_node
, 0, &res_regs
);
697 dev_err(&pdev
->dev
, "failed to retrieve registers base from device tree\n");
701 /* Get IRQ from device tree */
702 irq
= irq_of_parse_and_map(pdev
->dev
.of_node
, 0);
704 dev_err(&pdev
->dev
, "failed to retrieve <irq> value from device tree\n");
708 ndev
= alloc_etherdev(sizeof(struct arc_emac_priv
));
712 platform_set_drvdata(pdev
, ndev
);
713 SET_NETDEV_DEV(ndev
, &pdev
->dev
);
715 ndev
->netdev_ops
= &arc_emac_netdev_ops
;
716 ndev
->ethtool_ops
= &arc_emac_ethtool_ops
;
717 ndev
->watchdog_timeo
= TX_TIMEOUT
;
718 /* FIXME :: no multicast support yet */
719 ndev
->flags
&= ~IFF_MULTICAST
;
721 priv
= netdev_priv(ndev
);
722 priv
->dev
= &pdev
->dev
;
724 priv
->regs
= devm_ioremap_resource(&pdev
->dev
, &res_regs
);
725 if (IS_ERR(priv
->regs
)) {
726 err
= PTR_ERR(priv
->regs
);
729 dev_dbg(&pdev
->dev
, "Registers base address is 0x%p\n", priv
->regs
);
731 priv
->clk
= of_clk_get(pdev
->dev
.of_node
, 0);
732 if (IS_ERR(priv
->clk
)) {
733 /* Get CPU clock frequency from device tree */
734 if (of_property_read_u32(pdev
->dev
.of_node
, "clock-frequency",
736 dev_err(&pdev
->dev
, "failed to retrieve <clock-frequency> from device tree\n");
741 err
= clk_prepare_enable(priv
->clk
);
743 dev_err(&pdev
->dev
, "failed to enable clock\n");
747 clock_frequency
= clk_get_rate(priv
->clk
);
750 id
= arc_reg_get(priv
, R_ID
);
752 /* Check for EMAC revision 5 or 7, magic number */
753 if (!(id
== 0x0005fd02 || id
== 0x0007fd02)) {
754 dev_err(&pdev
->dev
, "ARC EMAC not detected, id=0x%x\n", id
);
758 dev_info(&pdev
->dev
, "ARC EMAC detected with id: 0x%x\n", id
);
760 /* Set poll rate so that it polls every 1 ms */
761 arc_reg_set(priv
, R_POLLRATE
, clock_frequency
/ 1000000);
764 dev_info(&pdev
->dev
, "IRQ is %d\n", ndev
->irq
);
766 /* Register interrupt handler for device */
767 err
= devm_request_irq(&pdev
->dev
, ndev
->irq
, arc_emac_intr
, 0,
770 dev_err(&pdev
->dev
, "could not allocate IRQ\n");
774 /* Get MAC address from device tree */
775 mac_addr
= of_get_mac_address(pdev
->dev
.of_node
);
778 memcpy(ndev
->dev_addr
, mac_addr
, ETH_ALEN
);
780 eth_hw_addr_random(ndev
);
782 arc_emac_set_address_internal(ndev
);
783 dev_info(&pdev
->dev
, "MAC address is now %pM\n", ndev
->dev_addr
);
785 /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
786 priv
->rxbd
= dmam_alloc_coherent(&pdev
->dev
, RX_RING_SZ
+ TX_RING_SZ
,
787 &priv
->rxbd_dma
, GFP_KERNEL
);
790 dev_err(&pdev
->dev
, "failed to allocate data buffers\n");
795 priv
->txbd
= priv
->rxbd
+ RX_BD_NUM
;
797 priv
->txbd_dma
= priv
->rxbd_dma
+ RX_RING_SZ
;
798 dev_dbg(&pdev
->dev
, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
799 (unsigned int)priv
->rxbd_dma
, (unsigned int)priv
->txbd_dma
);
801 err
= arc_mdio_probe(pdev
, priv
);
803 dev_err(&pdev
->dev
, "failed to probe MII bus\n");
807 priv
->phy_dev
= of_phy_connect(ndev
, phy_node
, arc_emac_adjust_link
, 0,
808 PHY_INTERFACE_MODE_MII
);
809 if (!priv
->phy_dev
) {
810 dev_err(&pdev
->dev
, "of_phy_connect() failed\n");
815 dev_info(&pdev
->dev
, "connected to %s phy with id 0x%x\n",
816 priv
->phy_dev
->drv
->name
, priv
->phy_dev
->phy_id
);
818 netif_napi_add(ndev
, &priv
->napi
, arc_emac_poll
, ARC_EMAC_NAPI_WEIGHT
);
820 err
= register_netdev(ndev
);
822 dev_err(&pdev
->dev
, "failed to register network device\n");
829 netif_napi_del(&priv
->napi
);
830 phy_disconnect(priv
->phy_dev
);
831 priv
->phy_dev
= NULL
;
833 arc_mdio_remove(priv
);
835 if (!IS_ERR(priv
->clk
))
836 clk_disable_unprepare(priv
->clk
);
838 if (!IS_ERR(priv
->clk
))
845 static int arc_emac_remove(struct platform_device
*pdev
)
847 struct net_device
*ndev
= platform_get_drvdata(pdev
);
848 struct arc_emac_priv
*priv
= netdev_priv(ndev
);
850 phy_disconnect(priv
->phy_dev
);
851 priv
->phy_dev
= NULL
;
852 arc_mdio_remove(priv
);
853 unregister_netdev(ndev
);
854 netif_napi_del(&priv
->napi
);
856 if (!IS_ERR(priv
->clk
)) {
857 clk_disable_unprepare(priv
->clk
);
866 static const struct of_device_id arc_emac_dt_ids
[] = {
867 { .compatible
= "snps,arc-emac" },
870 MODULE_DEVICE_TABLE(of
, arc_emac_dt_ids
);
872 static struct platform_driver arc_emac_driver
= {
873 .probe
= arc_emac_probe
,
874 .remove
= arc_emac_remove
,
877 .owner
= THIS_MODULE
,
878 .of_match_table
= arc_emac_dt_ids
,
882 module_platform_driver(arc_emac_driver
);
884 MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
885 MODULE_DESCRIPTION("ARC EMAC driver");
886 MODULE_LICENSE("GPL");