2 * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
4 * 2005-2010 (c) Aeroflex Gaisler AB
6 * This driver supports GRETH 10/100 and GRETH 10/100/1G Ethernet MACs
7 * available in the GRLIB VHDL IP core library.
9 * Full documentation of both cores can be found here:
10 * http://www.gaisler.com/products/grlib/grip.pdf
12 * The Gigabit version supports scatter/gather DMA, any alignment of
13 * buffers and checksum offloading.
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
20 * Contributors: Kristoffer Glembo
25 #include <linux/dma-mapping.h>
26 #include <linux/module.h>
27 #include <linux/uaccess.h>
28 #include <linux/init.h>
29 #include <linux/interrupt.h>
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/ethtool.h>
33 #include <linux/skbuff.h>
35 #include <linux/crc32.h>
36 #include <linux/mii.h>
37 #include <linux/of_device.h>
38 #include <linux/of_platform.h>
39 #include <linux/slab.h>
40 #include <asm/cacheflush.h>
41 #include <asm/byteorder.h>
44 #include <asm/idprom.h>
49 #define GRETH_DEF_MSG_ENABLE \
58 static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
59 module_param(greth_debug, int, 0);
60 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
62 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
63 static int macaddr[6];
64 module_param_array(macaddr, int, NULL, 0);
65 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
67 static int greth_edcl = 1;
68 module_param(greth_edcl, int, 0);
69 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
71 static int greth_open(struct net_device *dev);
72 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
73 struct net_device *dev);
74 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
75 struct net_device *dev);
76 static int greth_rx(struct net_device *dev, int limit);
77 static int greth_rx_gbit(struct net_device *dev, int limit);
78 static void greth_clean_tx(struct net_device *dev);
79 static void greth_clean_tx_gbit(struct net_device *dev);
80 static irqreturn_t greth_interrupt(int irq, void *dev_id);
81 static int greth_close(struct net_device *dev);
82 static int greth_set_mac_add(struct net_device *dev, void *p);
83 static void greth_set_multicast_list(struct net_device *dev);
85 #define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
86 #define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
87 #define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
88 #define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
90 #define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
91 #define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
92 #define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
94 static void greth_print_rx_packet(void *addr, int len)
96 print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
100 static void greth_print_tx_packet(struct sk_buff *skb)
105 if (skb_shinfo(skb)->nr_frags == 0)
108 length = skb_headlen(skb);
110 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
111 skb->data, length, true);
113 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
115 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
116 skb_frag_address(&skb_shinfo(skb)->frags[i]),
117 skb_shinfo(skb)->frags[i].size, true);
121 static inline void greth_enable_tx(struct greth_private *greth)
124 GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
127 static inline void greth_disable_tx(struct greth_private *greth)
129 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
132 static inline void greth_enable_rx(struct greth_private *greth)
135 GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
138 static inline void greth_disable_rx(struct greth_private *greth)
140 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
143 static inline void greth_enable_irqs(struct greth_private *greth)
145 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
148 static inline void greth_disable_irqs(struct greth_private *greth)
150 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
153 static inline void greth_write_bd(u32 *bd, u32 val)
155 __raw_writel(cpu_to_be32(val), bd);
158 static inline u32 greth_read_bd(u32 *bd)
160 return be32_to_cpu(__raw_readl(bd));
163 static void greth_clean_rings(struct greth_private *greth)
166 struct greth_bd *rx_bdp = greth->rx_bd_base;
167 struct greth_bd *tx_bdp = greth->tx_bd_base;
169 if (greth->gbit_mac) {
171 /* Free and unmap RX buffers */
172 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
173 if (greth->rx_skbuff[i] != NULL) {
174 dev_kfree_skb(greth->rx_skbuff[i]);
175 dma_unmap_single(greth->dev,
176 greth_read_bd(&rx_bdp->addr),
177 MAX_FRAME_SIZE+NET_IP_ALIGN,
183 while (greth->tx_free < GRETH_TXBD_NUM) {
185 struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
186 int nr_frags = skb_shinfo(skb)->nr_frags;
187 tx_bdp = greth->tx_bd_base + greth->tx_last;
188 greth->tx_last = NEXT_TX(greth->tx_last);
190 dma_unmap_single(greth->dev,
191 greth_read_bd(&tx_bdp->addr),
195 for (i = 0; i < nr_frags; i++) {
196 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
197 tx_bdp = greth->tx_bd_base + greth->tx_last;
199 dma_unmap_page(greth->dev,
200 greth_read_bd(&tx_bdp->addr),
204 greth->tx_last = NEXT_TX(greth->tx_last);
206 greth->tx_free += nr_frags+1;
211 } else { /* 10/100 Mbps MAC */
213 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
214 kfree(greth->rx_bufs[i]);
215 dma_unmap_single(greth->dev,
216 greth_read_bd(&rx_bdp->addr),
220 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
221 kfree(greth->tx_bufs[i]);
222 dma_unmap_single(greth->dev,
223 greth_read_bd(&tx_bdp->addr),
230 static int greth_init_rings(struct greth_private *greth)
233 struct greth_bd *rx_bd, *tx_bd;
237 rx_bd = greth->rx_bd_base;
238 tx_bd = greth->tx_bd_base;
240 /* Initialize descriptor rings and buffers */
241 if (greth->gbit_mac) {
243 for (i = 0; i < GRETH_RXBD_NUM; i++) {
244 skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
246 if (netif_msg_ifup(greth))
247 dev_err(greth->dev, "Error allocating DMA ring.\n");
250 skb_reserve(skb, NET_IP_ALIGN);
251 dma_addr = dma_map_single(greth->dev,
253 MAX_FRAME_SIZE+NET_IP_ALIGN,
256 if (dma_mapping_error(greth->dev, dma_addr)) {
257 if (netif_msg_ifup(greth))
258 dev_err(greth->dev, "Could not create initial DMA mapping\n");
261 greth->rx_skbuff[i] = skb;
262 greth_write_bd(&rx_bd[i].addr, dma_addr);
263 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
268 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
269 for (i = 0; i < GRETH_RXBD_NUM; i++) {
271 greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
273 if (greth->rx_bufs[i] == NULL) {
274 if (netif_msg_ifup(greth))
275 dev_err(greth->dev, "Error allocating DMA ring.\n");
279 dma_addr = dma_map_single(greth->dev,
284 if (dma_mapping_error(greth->dev, dma_addr)) {
285 if (netif_msg_ifup(greth))
286 dev_err(greth->dev, "Could not create initial DMA mapping\n");
289 greth_write_bd(&rx_bd[i].addr, dma_addr);
290 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
292 for (i = 0; i < GRETH_TXBD_NUM; i++) {
294 greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
296 if (greth->tx_bufs[i] == NULL) {
297 if (netif_msg_ifup(greth))
298 dev_err(greth->dev, "Error allocating DMA ring.\n");
302 dma_addr = dma_map_single(greth->dev,
307 if (dma_mapping_error(greth->dev, dma_addr)) {
308 if (netif_msg_ifup(greth))
309 dev_err(greth->dev, "Could not create initial DMA mapping\n");
312 greth_write_bd(&tx_bd[i].addr, dma_addr);
313 greth_write_bd(&tx_bd[i].stat, 0);
316 greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
317 greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
319 /* Initialize pointers. */
323 greth->tx_free = GRETH_TXBD_NUM;
325 /* Initialize descriptor base address */
326 GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
327 GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
332 greth_clean_rings(greth);
336 static int greth_open(struct net_device *dev)
338 struct greth_private *greth = netdev_priv(dev);
341 err = greth_init_rings(greth);
343 if (netif_msg_ifup(greth))
344 dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
348 err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
350 if (netif_msg_ifup(greth))
351 dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
352 greth_clean_rings(greth);
356 if (netif_msg_ifup(greth))
357 dev_dbg(&dev->dev, " starting queue\n");
358 netif_start_queue(dev);
360 GRETH_REGSAVE(greth->regs->status, 0xFF);
362 napi_enable(&greth->napi);
364 greth_enable_irqs(greth);
365 greth_enable_tx(greth);
366 greth_enable_rx(greth);
371 static int greth_close(struct net_device *dev)
373 struct greth_private *greth = netdev_priv(dev);
375 napi_disable(&greth->napi);
377 greth_disable_irqs(greth);
378 greth_disable_tx(greth);
379 greth_disable_rx(greth);
381 netif_stop_queue(dev);
383 free_irq(greth->irq, (void *) dev);
385 greth_clean_rings(greth);
391 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
393 struct greth_private *greth = netdev_priv(dev);
394 struct greth_bd *bdp;
395 int err = NETDEV_TX_OK;
396 u32 status, dma_addr, ctrl;
400 greth_clean_tx(greth->netdev);
402 if (unlikely(greth->tx_free <= 0)) {
403 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
404 ctrl = GRETH_REGLOAD(greth->regs->control);
405 /* Enable TX IRQ only if not already in poll() routine */
406 if (ctrl & GRETH_RXI)
407 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
408 netif_stop_queue(dev);
409 spin_unlock_irqrestore(&greth->devlock, flags);
410 return NETDEV_TX_BUSY;
413 if (netif_msg_pktdata(greth))
414 greth_print_tx_packet(skb);
417 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
418 dev->stats.tx_errors++;
422 bdp = greth->tx_bd_base + greth->tx_next;
423 dma_addr = greth_read_bd(&bdp->addr);
425 memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
427 dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
429 status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
430 greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
432 /* Wrap around descriptor ring */
433 if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
434 status |= GRETH_BD_WR;
437 greth->tx_next = NEXT_TX(greth->tx_next);
440 /* Write descriptor control word and enable transmission */
441 greth_write_bd(&bdp->stat, status);
442 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
443 greth_enable_tx(greth);
444 spin_unlock_irqrestore(&greth->devlock, flags);
453 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
455 struct greth_private *greth = netdev_priv(dev);
456 struct greth_bd *bdp;
457 u32 status = 0, dma_addr, ctrl;
458 int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
461 nr_frags = skb_shinfo(skb)->nr_frags;
464 greth_clean_tx_gbit(dev);
466 if (greth->tx_free < nr_frags + 1) {
467 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
468 ctrl = GRETH_REGLOAD(greth->regs->control);
469 /* Enable TX IRQ only if not already in poll() routine */
470 if (ctrl & GRETH_RXI)
471 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
472 netif_stop_queue(dev);
473 spin_unlock_irqrestore(&greth->devlock, flags);
474 err = NETDEV_TX_BUSY;
478 if (netif_msg_pktdata(greth))
479 greth_print_tx_packet(skb);
481 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
482 dev->stats.tx_errors++;
486 /* Save skb pointer. */
487 greth->tx_skbuff[greth->tx_next] = skb;
491 status = GRETH_TXBD_MORE;
493 if (skb->ip_summed == CHECKSUM_PARTIAL)
494 status |= GRETH_TXBD_CSALL;
495 status |= skb_headlen(skb) & GRETH_BD_LEN;
496 if (greth->tx_next == GRETH_TXBD_NUM_MASK)
497 status |= GRETH_BD_WR;
500 bdp = greth->tx_bd_base + greth->tx_next;
501 greth_write_bd(&bdp->stat, status);
502 dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
504 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
507 greth_write_bd(&bdp->addr, dma_addr);
509 curr_tx = NEXT_TX(greth->tx_next);
512 for (i = 0; i < nr_frags; i++) {
513 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
514 greth->tx_skbuff[curr_tx] = NULL;
515 bdp = greth->tx_bd_base + curr_tx;
517 status = GRETH_BD_EN;
518 if (skb->ip_summed == CHECKSUM_PARTIAL)
519 status |= GRETH_TXBD_CSALL;
520 status |= skb_frag_size(frag) & GRETH_BD_LEN;
522 /* Wrap around descriptor ring */
523 if (curr_tx == GRETH_TXBD_NUM_MASK)
524 status |= GRETH_BD_WR;
526 /* More fragments left */
527 if (i < nr_frags - 1)
528 status |= GRETH_TXBD_MORE;
530 status |= GRETH_BD_IE; /* enable IRQ on last fragment */
532 greth_write_bd(&bdp->stat, status);
534 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
537 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
540 greth_write_bd(&bdp->addr, dma_addr);
542 curr_tx = NEXT_TX(curr_tx);
547 /* Enable the descriptor chain by enabling the first descriptor */
548 bdp = greth->tx_bd_base + greth->tx_next;
549 greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
550 greth->tx_next = curr_tx;
551 greth->tx_free -= nr_frags + 1;
555 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
556 greth_enable_tx(greth);
557 spin_unlock_irqrestore(&greth->devlock, flags);
562 /* Unmap SKB mappings that succeeded and disable descriptor */
563 for (i = 0; greth->tx_next + i != curr_tx; i++) {
564 bdp = greth->tx_bd_base + greth->tx_next + i;
565 dma_unmap_single(greth->dev,
566 greth_read_bd(&bdp->addr),
567 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
569 greth_write_bd(&bdp->stat, 0);
573 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
579 static irqreturn_t greth_interrupt(int irq, void *dev_id)
581 struct net_device *dev = dev_id;
582 struct greth_private *greth;
584 irqreturn_t retval = IRQ_NONE;
586 greth = netdev_priv(dev);
588 spin_lock(&greth->devlock);
590 /* Get the interrupt events that caused us to be here. */
591 status = GRETH_REGLOAD(greth->regs->status);
593 /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
594 * set regardless of whether IRQ is enabled or not. Especially
595 * important when shared IRQ.
597 ctrl = GRETH_REGLOAD(greth->regs->control);
599 /* Handle rx and tx interrupts through poll */
600 if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
601 ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
602 retval = IRQ_HANDLED;
604 /* Disable interrupts and schedule poll() */
605 greth_disable_irqs(greth);
606 napi_schedule(&greth->napi);
610 spin_unlock(&greth->devlock);
615 static void greth_clean_tx(struct net_device *dev)
617 struct greth_private *greth;
618 struct greth_bd *bdp;
621 greth = netdev_priv(dev);
624 bdp = greth->tx_bd_base + greth->tx_last;
625 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
627 stat = greth_read_bd(&bdp->stat);
629 if (unlikely(stat & GRETH_BD_EN))
632 if (greth->tx_free == GRETH_TXBD_NUM)
635 /* Check status for errors */
636 if (unlikely(stat & GRETH_TXBD_STATUS)) {
637 dev->stats.tx_errors++;
638 if (stat & GRETH_TXBD_ERR_AL)
639 dev->stats.tx_aborted_errors++;
640 if (stat & GRETH_TXBD_ERR_UE)
641 dev->stats.tx_fifo_errors++;
643 dev->stats.tx_packets++;
644 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
645 greth->tx_last = NEXT_TX(greth->tx_last);
649 if (greth->tx_free > 0) {
650 netif_wake_queue(dev);
655 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
657 /* Check status for errors */
658 if (unlikely(stat & GRETH_TXBD_STATUS)) {
659 dev->stats.tx_errors++;
660 if (stat & GRETH_TXBD_ERR_AL)
661 dev->stats.tx_aborted_errors++;
662 if (stat & GRETH_TXBD_ERR_UE)
663 dev->stats.tx_fifo_errors++;
664 if (stat & GRETH_TXBD_ERR_LC)
665 dev->stats.tx_aborted_errors++;
667 dev->stats.tx_packets++;
670 static void greth_clean_tx_gbit(struct net_device *dev)
672 struct greth_private *greth;
673 struct greth_bd *bdp, *bdp_last_frag;
678 greth = netdev_priv(dev);
680 while (greth->tx_free < GRETH_TXBD_NUM) {
682 skb = greth->tx_skbuff[greth->tx_last];
684 nr_frags = skb_shinfo(skb)->nr_frags;
686 /* We only clean fully completed SKBs */
687 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
689 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
691 stat = greth_read_bd(&bdp_last_frag->stat);
693 if (stat & GRETH_BD_EN)
696 greth->tx_skbuff[greth->tx_last] = NULL;
698 greth_update_tx_stats(dev, stat);
699 dev->stats.tx_bytes += skb->len;
701 bdp = greth->tx_bd_base + greth->tx_last;
703 greth->tx_last = NEXT_TX(greth->tx_last);
705 dma_unmap_single(greth->dev,
706 greth_read_bd(&bdp->addr),
710 for (i = 0; i < nr_frags; i++) {
711 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
712 bdp = greth->tx_bd_base + greth->tx_last;
714 dma_unmap_page(greth->dev,
715 greth_read_bd(&bdp->addr),
719 greth->tx_last = NEXT_TX(greth->tx_last);
721 greth->tx_free += nr_frags+1;
725 if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
726 netif_wake_queue(dev);
729 static int greth_rx(struct net_device *dev, int limit)
731 struct greth_private *greth;
732 struct greth_bd *bdp;
736 u32 status, dma_addr;
739 greth = netdev_priv(dev);
741 for (count = 0; count < limit; ++count) {
743 bdp = greth->rx_bd_base + greth->rx_cur;
744 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
746 status = greth_read_bd(&bdp->stat);
748 if (unlikely(status & GRETH_BD_EN)) {
752 dma_addr = greth_read_bd(&bdp->addr);
755 /* Check status for errors. */
756 if (unlikely(status & GRETH_RXBD_STATUS)) {
757 if (status & GRETH_RXBD_ERR_FT) {
758 dev->stats.rx_length_errors++;
761 if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
762 dev->stats.rx_frame_errors++;
765 if (status & GRETH_RXBD_ERR_CRC) {
766 dev->stats.rx_crc_errors++;
771 dev->stats.rx_errors++;
775 pkt_len = status & GRETH_BD_LEN;
777 skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
779 if (unlikely(skb == NULL)) {
782 dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
784 dev->stats.rx_dropped++;
787 skb_reserve(skb, NET_IP_ALIGN);
789 dma_sync_single_for_cpu(greth->dev,
794 if (netif_msg_pktdata(greth))
795 greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
797 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
799 skb->protocol = eth_type_trans(skb, dev);
800 dev->stats.rx_bytes += pkt_len;
801 dev->stats.rx_packets++;
802 netif_receive_skb(skb);
806 status = GRETH_BD_EN | GRETH_BD_IE;
807 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
808 status |= GRETH_BD_WR;
812 greth_write_bd(&bdp->stat, status);
814 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
816 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
817 greth_enable_rx(greth);
818 spin_unlock_irqrestore(&greth->devlock, flags);
820 greth->rx_cur = NEXT_RX(greth->rx_cur);
826 static inline int hw_checksummed(u32 status)
829 if (status & GRETH_RXBD_IP_FRAG)
832 if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
835 if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
838 if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
844 static int greth_rx_gbit(struct net_device *dev, int limit)
846 struct greth_private *greth;
847 struct greth_bd *bdp;
848 struct sk_buff *skb, *newskb;
851 u32 status, dma_addr;
854 greth = netdev_priv(dev);
856 for (count = 0; count < limit; ++count) {
858 bdp = greth->rx_bd_base + greth->rx_cur;
859 skb = greth->rx_skbuff[greth->rx_cur];
860 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
862 status = greth_read_bd(&bdp->stat);
865 if (status & GRETH_BD_EN)
868 /* Check status for errors. */
869 if (unlikely(status & GRETH_RXBD_STATUS)) {
871 if (status & GRETH_RXBD_ERR_FT) {
872 dev->stats.rx_length_errors++;
875 (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
876 dev->stats.rx_frame_errors++;
878 } else if (status & GRETH_RXBD_ERR_CRC) {
879 dev->stats.rx_crc_errors++;
884 /* Allocate new skb to replace current, not needed if the
885 * current skb can be reused */
886 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
887 skb_reserve(newskb, NET_IP_ALIGN);
889 dma_addr = dma_map_single(greth->dev,
891 MAX_FRAME_SIZE + NET_IP_ALIGN,
894 if (!dma_mapping_error(greth->dev, dma_addr)) {
895 /* Process the incoming frame. */
896 pkt_len = status & GRETH_BD_LEN;
898 dma_unmap_single(greth->dev,
899 greth_read_bd(&bdp->addr),
900 MAX_FRAME_SIZE + NET_IP_ALIGN,
903 if (netif_msg_pktdata(greth))
904 greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
906 skb_put(skb, pkt_len);
908 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
909 skb->ip_summed = CHECKSUM_UNNECESSARY;
911 skb_checksum_none_assert(skb);
913 skb->protocol = eth_type_trans(skb, dev);
914 dev->stats.rx_packets++;
915 dev->stats.rx_bytes += pkt_len;
916 netif_receive_skb(skb);
918 greth->rx_skbuff[greth->rx_cur] = newskb;
919 greth_write_bd(&bdp->addr, dma_addr);
922 dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
923 dev_kfree_skb(newskb);
924 /* reusing current skb, so it is a drop */
925 dev->stats.rx_dropped++;
928 /* Bad Frame transfer, the skb is reused */
929 dev->stats.rx_dropped++;
931 /* Failed Allocating a new skb. This is rather stupid
932 * but the current "filled" skb is reused, as if
933 * transfer failure. One could argue that RX descriptor
934 * table handling should be divided into cleaning and
935 * filling as the TX part of the driver
938 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
939 /* reusing current skb, so it is a drop */
940 dev->stats.rx_dropped++;
943 status = GRETH_BD_EN | GRETH_BD_IE;
944 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
945 status |= GRETH_BD_WR;
949 greth_write_bd(&bdp->stat, status);
950 spin_lock_irqsave(&greth->devlock, flags);
951 greth_enable_rx(greth);
952 spin_unlock_irqrestore(&greth->devlock, flags);
953 greth->rx_cur = NEXT_RX(greth->rx_cur);
960 static int greth_poll(struct napi_struct *napi, int budget)
962 struct greth_private *greth;
966 greth = container_of(napi, struct greth_private, napi);
969 if (netif_queue_stopped(greth->netdev)) {
971 greth_clean_tx_gbit(greth->netdev);
973 greth_clean_tx(greth->netdev);
976 if (greth->gbit_mac) {
977 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
979 work_done += greth_rx(greth->netdev, budget - work_done);
982 if (work_done < budget) {
984 spin_lock_irqsave(&greth->devlock, flags);
986 ctrl = GRETH_REGLOAD(greth->regs->control);
987 if (netif_queue_stopped(greth->netdev)) {
988 GRETH_REGSAVE(greth->regs->control,
989 ctrl | GRETH_TXI | GRETH_RXI);
990 mask = GRETH_INT_RX | GRETH_INT_RE |
991 GRETH_INT_TX | GRETH_INT_TE;
993 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
994 mask = GRETH_INT_RX | GRETH_INT_RE;
997 if (GRETH_REGLOAD(greth->regs->status) & mask) {
998 GRETH_REGSAVE(greth->regs->control, ctrl);
999 spin_unlock_irqrestore(&greth->devlock, flags);
1000 goto restart_txrx_poll;
1002 __napi_complete(napi);
1003 spin_unlock_irqrestore(&greth->devlock, flags);
1010 static int greth_set_mac_add(struct net_device *dev, void *p)
1012 struct sockaddr *addr = p;
1013 struct greth_private *greth;
1014 struct greth_regs *regs;
1016 greth = netdev_priv(dev);
1019 if (!is_valid_ether_addr(addr->sa_data))
1020 return -EADDRNOTAVAIL;
1022 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1023 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1024 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1025 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1030 static u32 greth_hash_get_index(__u8 *addr)
1032 return (ether_crc(6, addr)) & 0x3F;
1035 static void greth_set_hash_filter(struct net_device *dev)
1037 struct netdev_hw_addr *ha;
1038 struct greth_private *greth = netdev_priv(dev);
1039 struct greth_regs *regs = greth->regs;
1043 mc_filter[0] = mc_filter[1] = 0;
1045 netdev_for_each_mc_addr(ha, dev) {
1046 bitnr = greth_hash_get_index(ha->addr);
1047 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1050 GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1051 GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1054 static void greth_set_multicast_list(struct net_device *dev)
1057 struct greth_private *greth = netdev_priv(dev);
1058 struct greth_regs *regs = greth->regs;
1060 cfg = GRETH_REGLOAD(regs->control);
1061 if (dev->flags & IFF_PROMISC)
1062 cfg |= GRETH_CTRL_PR;
1064 cfg &= ~GRETH_CTRL_PR;
1066 if (greth->multicast) {
1067 if (dev->flags & IFF_ALLMULTI) {
1068 GRETH_REGSAVE(regs->hash_msb, -1);
1069 GRETH_REGSAVE(regs->hash_lsb, -1);
1070 cfg |= GRETH_CTRL_MCEN;
1071 GRETH_REGSAVE(regs->control, cfg);
1075 if (netdev_mc_empty(dev)) {
1076 cfg &= ~GRETH_CTRL_MCEN;
1077 GRETH_REGSAVE(regs->control, cfg);
1081 /* Setup multicast filter */
1082 greth_set_hash_filter(dev);
1083 cfg |= GRETH_CTRL_MCEN;
1085 GRETH_REGSAVE(regs->control, cfg);
1088 static u32 greth_get_msglevel(struct net_device *dev)
1090 struct greth_private *greth = netdev_priv(dev);
1091 return greth->msg_enable;
1094 static void greth_set_msglevel(struct net_device *dev, u32 value)
1096 struct greth_private *greth = netdev_priv(dev);
1097 greth->msg_enable = value;
1099 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1101 struct greth_private *greth = netdev_priv(dev);
1102 struct phy_device *phy = greth->phy;
1107 return phy_ethtool_gset(phy, cmd);
1110 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1112 struct greth_private *greth = netdev_priv(dev);
1113 struct phy_device *phy = greth->phy;
1118 return phy_ethtool_sset(phy, cmd);
1121 static int greth_get_regs_len(struct net_device *dev)
1123 return sizeof(struct greth_regs);
1126 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1128 struct greth_private *greth = netdev_priv(dev);
1130 strlcpy(info->driver, dev_driver_string(greth->dev),
1131 sizeof(info->driver));
1132 strlcpy(info->version, "revision: 1.0", sizeof(info->version));
1133 strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1134 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1135 info->eedump_len = 0;
1136 info->regdump_len = sizeof(struct greth_regs);
1139 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1142 struct greth_private *greth = netdev_priv(dev);
1143 u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1146 for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1147 buff[i] = greth_read_bd(&greth_regs[i]);
1150 static const struct ethtool_ops greth_ethtool_ops = {
1151 .get_msglevel = greth_get_msglevel,
1152 .set_msglevel = greth_set_msglevel,
1153 .get_settings = greth_get_settings,
1154 .set_settings = greth_set_settings,
1155 .get_drvinfo = greth_get_drvinfo,
1156 .get_regs_len = greth_get_regs_len,
1157 .get_regs = greth_get_regs,
1158 .get_link = ethtool_op_get_link,
1161 static struct net_device_ops greth_netdev_ops = {
1162 .ndo_open = greth_open,
1163 .ndo_stop = greth_close,
1164 .ndo_start_xmit = greth_start_xmit,
1165 .ndo_set_mac_address = greth_set_mac_add,
1166 .ndo_validate_addr = eth_validate_addr,
1169 static inline int wait_for_mdio(struct greth_private *greth)
1171 unsigned long timeout = jiffies + 4*HZ/100;
1172 while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1173 if (time_after(jiffies, timeout))
1179 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1181 struct greth_private *greth = bus->priv;
1184 if (!wait_for_mdio(greth))
1187 GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1189 if (!wait_for_mdio(greth))
1192 if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1193 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1201 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1203 struct greth_private *greth = bus->priv;
1205 if (!wait_for_mdio(greth))
1208 GRETH_REGSAVE(greth->regs->mdio,
1209 ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1211 if (!wait_for_mdio(greth))
1217 static int greth_mdio_reset(struct mii_bus *bus)
1222 static void greth_link_change(struct net_device *dev)
1224 struct greth_private *greth = netdev_priv(dev);
1225 struct phy_device *phydev = greth->phy;
1226 unsigned long flags;
1227 int status_change = 0;
1230 spin_lock_irqsave(&greth->devlock, flags);
1234 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1235 ctrl = GRETH_REGLOAD(greth->regs->control) &
1236 ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1239 ctrl |= GRETH_CTRL_FD;
1241 if (phydev->speed == SPEED_100)
1242 ctrl |= GRETH_CTRL_SP;
1243 else if (phydev->speed == SPEED_1000)
1244 ctrl |= GRETH_CTRL_GB;
1246 GRETH_REGSAVE(greth->regs->control, ctrl);
1247 greth->speed = phydev->speed;
1248 greth->duplex = phydev->duplex;
1253 if (phydev->link != greth->link) {
1254 if (!phydev->link) {
1258 greth->link = phydev->link;
1263 spin_unlock_irqrestore(&greth->devlock, flags);
1265 if (status_change) {
1267 pr_debug("%s: link up (%d/%s)\n",
1268 dev->name, phydev->speed,
1269 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1271 pr_debug("%s: link down\n", dev->name);
1275 static int greth_mdio_probe(struct net_device *dev)
1277 struct greth_private *greth = netdev_priv(dev);
1278 struct phy_device *phy = NULL;
1281 /* Find the first PHY */
1282 phy = phy_find_first(greth->mdio);
1285 if (netif_msg_probe(greth))
1286 dev_err(&dev->dev, "no PHY found\n");
1290 ret = phy_connect_direct(dev, phy, &greth_link_change,
1291 greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1293 if (netif_msg_ifup(greth))
1294 dev_err(&dev->dev, "could not attach to PHY\n");
1298 if (greth->gbit_mac)
1299 phy->supported &= PHY_GBIT_FEATURES;
1301 phy->supported &= PHY_BASIC_FEATURES;
1303 phy->advertising = phy->supported;
1313 static inline int phy_aneg_done(struct phy_device *phydev)
1317 retval = phy_read(phydev, MII_BMSR);
1319 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1322 static int greth_mdio_init(struct greth_private *greth)
1325 unsigned long timeout;
1327 greth->mdio = mdiobus_alloc();
1332 greth->mdio->name = "greth-mdio";
1333 snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1334 greth->mdio->read = greth_mdio_read;
1335 greth->mdio->write = greth_mdio_write;
1336 greth->mdio->reset = greth_mdio_reset;
1337 greth->mdio->priv = greth;
1339 greth->mdio->irq = greth->mdio_irqs;
1341 for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1342 greth->mdio->irq[phy] = PHY_POLL;
1344 ret = mdiobus_register(greth->mdio);
1349 ret = greth_mdio_probe(greth->netdev);
1351 if (netif_msg_probe(greth))
1352 dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1356 phy_start(greth->phy);
1358 /* If Ethernet debug link is used make autoneg happen right away */
1359 if (greth->edcl && greth_edcl == 1) {
1360 phy_start_aneg(greth->phy);
1361 timeout = jiffies + 6*HZ;
1362 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1364 genphy_read_status(greth->phy);
1365 greth_link_change(greth->netdev);
1371 mdiobus_unregister(greth->mdio);
1373 mdiobus_free(greth->mdio);
1377 /* Initialize the GRETH MAC */
1378 static int greth_of_probe(struct platform_device *ofdev)
1380 struct net_device *dev;
1381 struct greth_private *greth;
1382 struct greth_regs *regs;
1387 unsigned long timeout;
1389 dev = alloc_etherdev(sizeof(struct greth_private));
1394 greth = netdev_priv(dev);
1395 greth->netdev = dev;
1396 greth->dev = &ofdev->dev;
1398 if (greth_debug > 0)
1399 greth->msg_enable = greth_debug;
1401 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1403 spin_lock_init(&greth->devlock);
1405 greth->regs = of_ioremap(&ofdev->resource[0], 0,
1406 resource_size(&ofdev->resource[0]),
1407 "grlib-greth regs");
1409 if (greth->regs == NULL) {
1410 if (netif_msg_probe(greth))
1411 dev_err(greth->dev, "ioremap failure.\n");
1417 greth->irq = ofdev->archdata.irqs[0];
1419 dev_set_drvdata(greth->dev, dev);
1420 SET_NETDEV_DEV(dev, greth->dev);
1422 if (netif_msg_probe(greth))
1423 dev_dbg(greth->dev, "resetting controller.\n");
1425 /* Reset the controller. */
1426 GRETH_REGSAVE(regs->control, GRETH_RESET);
1428 /* Wait for MAC to reset itself */
1429 timeout = jiffies + HZ/100;
1430 while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1431 if (time_after(jiffies, timeout)) {
1433 if (netif_msg_probe(greth))
1434 dev_err(greth->dev, "timeout when waiting for reset.\n");
1439 /* Get default PHY address */
1440 greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1442 /* Check if we have GBIT capable MAC */
1443 tmp = GRETH_REGLOAD(regs->control);
1444 greth->gbit_mac = (tmp >> 27) & 1;
1446 /* Check for multicast capability */
1447 greth->multicast = (tmp >> 25) & 1;
1449 greth->edcl = (tmp >> 31) & 1;
1451 /* If we have EDCL we disable the EDCL speed-duplex FSM so
1452 * it doesn't interfere with the software */
1453 if (greth->edcl != 0)
1454 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1456 /* Check if MAC can handle MDIO interrupts */
1457 greth->mdio_int_en = (tmp >> 26) & 1;
1459 err = greth_mdio_init(greth);
1461 if (netif_msg_probe(greth))
1462 dev_err(greth->dev, "failed to register MDIO bus\n");
1466 /* Allocate TX descriptor ring in coherent memory */
1467 greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1469 &greth->tx_bd_base_phys,
1472 if (!greth->tx_bd_base) {
1473 if (netif_msg_probe(greth))
1474 dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1479 memset(greth->tx_bd_base, 0, 1024);
1481 /* Allocate RX descriptor ring in coherent memory */
1482 greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1484 &greth->rx_bd_base_phys,
1487 if (!greth->rx_bd_base) {
1488 if (netif_msg_probe(greth))
1489 dev_err(greth->dev, "could not allocate descriptor memory.\n");
1494 memset(greth->rx_bd_base, 0, 1024);
1496 /* Get MAC address from: module param, OF property or ID prom */
1497 for (i = 0; i < 6; i++) {
1498 if (macaddr[i] != 0)
1502 const unsigned char *addr;
1504 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1506 if (addr != NULL && len == 6) {
1507 for (i = 0; i < 6; i++)
1508 macaddr[i] = (unsigned int) addr[i];
1511 for (i = 0; i < 6; i++)
1512 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1517 for (i = 0; i < 6; i++)
1518 dev->dev_addr[i] = macaddr[i];
1522 if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1523 if (netif_msg_probe(greth))
1524 dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1529 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1530 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1531 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1533 /* Clear all pending interrupts except PHY irq */
1534 GRETH_REGSAVE(regs->status, 0xFF);
1536 if (greth->gbit_mac) {
1537 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1539 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1540 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1543 if (greth->multicast) {
1544 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1545 dev->flags |= IFF_MULTICAST;
1547 dev->flags &= ~IFF_MULTICAST;
1550 dev->netdev_ops = &greth_netdev_ops;
1551 dev->ethtool_ops = &greth_ethtool_ops;
1553 err = register_netdev(dev);
1555 if (netif_msg_probe(greth))
1556 dev_err(greth->dev, "netdevice registration failed.\n");
1561 netif_napi_add(dev, &greth->napi, greth_poll, 64);
1566 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1568 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1570 mdiobus_unregister(greth->mdio);
1572 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1578 static int greth_of_remove(struct platform_device *of_dev)
1580 struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1581 struct greth_private *greth = netdev_priv(ndev);
1583 /* Free descriptor areas */
1584 dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1586 dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1588 dev_set_drvdata(&of_dev->dev, NULL);
1591 phy_stop(greth->phy);
1592 mdiobus_unregister(greth->mdio);
1594 unregister_netdev(ndev);
1597 of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1602 static struct of_device_id greth_of_match[] = {
1604 .name = "GAISLER_ETHMAC",
1612 MODULE_DEVICE_TABLE(of, greth_of_match);
1614 static struct platform_driver greth_of_driver = {
1616 .name = "grlib-greth",
1617 .owner = THIS_MODULE,
1618 .of_match_table = greth_of_match,
1620 .probe = greth_of_probe,
1621 .remove = greth_of_remove,
1624 module_platform_driver(greth_of_driver);
1626 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1627 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1628 MODULE_LICENSE("GPL");