2 * Aeroflex Gaisler GRETH 10/100/1G Ethernet MAC.
4 * 2005-2009 (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/module.h>
26 #include <linux/uaccess.h>
27 #include <linux/init.h>
28 #include <linux/netdevice.h>
29 #include <linux/etherdevice.h>
30 #include <linux/ethtool.h>
31 #include <linux/skbuff.h>
33 #include <linux/crc32.h>
34 #include <linux/mii.h>
35 #include <linux/of_device.h>
36 #include <linux/of_platform.h>
37 #include <asm/cacheflush.h>
38 #include <asm/byteorder.h>
41 #include <asm/idprom.h>
46 #define GRETH_DEF_MSG_ENABLE \
55 static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
56 module_param(greth_debug, int, 0);
57 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
59 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
60 static int macaddr[6];
61 module_param_array(macaddr, int, NULL, 0);
62 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
64 static int greth_edcl = 1;
65 module_param(greth_edcl, int, 0);
66 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
68 static int greth_open(struct net_device *dev);
69 static int greth_start_xmit(struct sk_buff *skb, struct net_device *dev);
70 static int greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev);
71 static int greth_rx(struct net_device *dev, int limit);
72 static int greth_rx_gbit(struct net_device *dev, int limit);
73 static void greth_clean_tx(struct net_device *dev);
74 static void greth_clean_tx_gbit(struct net_device *dev);
75 static irqreturn_t greth_interrupt(int irq, void *dev_id);
76 static int greth_close(struct net_device *dev);
77 static int greth_set_mac_add(struct net_device *dev, void *p);
78 static void greth_set_multicast_list(struct net_device *dev);
80 #define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
81 #define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
82 #define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
83 #define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
85 #define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
86 #define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
87 #define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
89 static void greth_print_rx_packet(void *addr, int len)
91 print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
95 static void greth_print_tx_packet(struct sk_buff *skb)
100 if (skb_shinfo(skb)->nr_frags == 0)
103 length = skb_headlen(skb);
105 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
106 skb->data, length, true);
108 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
110 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
111 phys_to_virt(page_to_phys(skb_shinfo(skb)->frags[i].page)) +
112 skb_shinfo(skb)->frags[i].page_offset,
117 static inline void greth_enable_tx(struct greth_private *greth)
120 GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
123 static inline void greth_disable_tx(struct greth_private *greth)
125 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
128 static inline void greth_enable_rx(struct greth_private *greth)
131 GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
134 static inline void greth_disable_rx(struct greth_private *greth)
136 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
139 static inline void greth_enable_irqs(struct greth_private *greth)
141 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
144 static inline void greth_disable_irqs(struct greth_private *greth)
146 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
149 static inline void greth_write_bd(u32 *bd, u32 val)
151 __raw_writel(cpu_to_be32(val), bd);
154 static inline u32 greth_read_bd(u32 *bd)
156 return be32_to_cpu(__raw_readl(bd));
159 static void greth_clean_rings(struct greth_private *greth)
162 struct greth_bd *rx_bdp = greth->rx_bd_base;
163 struct greth_bd *tx_bdp = greth->tx_bd_base;
165 if (greth->gbit_mac) {
167 /* Free and unmap RX buffers */
168 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
169 if (greth->rx_skbuff[i] != NULL) {
170 dev_kfree_skb(greth->rx_skbuff[i]);
171 dma_unmap_single(greth->dev,
172 greth_read_bd(&rx_bdp->addr),
173 MAX_FRAME_SIZE+NET_IP_ALIGN,
179 while (greth->tx_free < GRETH_TXBD_NUM) {
181 struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
182 int nr_frags = skb_shinfo(skb)->nr_frags;
183 tx_bdp = greth->tx_bd_base + greth->tx_last;
184 greth->tx_last = NEXT_TX(greth->tx_last);
186 dma_unmap_single(greth->dev,
187 greth_read_bd(&tx_bdp->addr),
191 for (i = 0; i < nr_frags; i++) {
192 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
193 tx_bdp = greth->tx_bd_base + greth->tx_last;
195 dma_unmap_page(greth->dev,
196 greth_read_bd(&tx_bdp->addr),
200 greth->tx_last = NEXT_TX(greth->tx_last);
202 greth->tx_free += nr_frags+1;
207 } else { /* 10/100 Mbps MAC */
209 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
210 kfree(greth->rx_bufs[i]);
211 dma_unmap_single(greth->dev,
212 greth_read_bd(&rx_bdp->addr),
216 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
217 kfree(greth->tx_bufs[i]);
218 dma_unmap_single(greth->dev,
219 greth_read_bd(&tx_bdp->addr),
226 static int greth_init_rings(struct greth_private *greth)
229 struct greth_bd *rx_bd, *tx_bd;
233 rx_bd = greth->rx_bd_base;
234 tx_bd = greth->tx_bd_base;
236 /* Initialize descriptor rings and buffers */
237 if (greth->gbit_mac) {
239 for (i = 0; i < GRETH_RXBD_NUM; i++) {
240 skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
242 if (netif_msg_ifup(greth))
243 dev_err(greth->dev, "Error allocating DMA ring.\n");
246 skb_reserve(skb, NET_IP_ALIGN);
247 dma_addr = dma_map_single(greth->dev,
249 MAX_FRAME_SIZE+NET_IP_ALIGN,
252 if (dma_mapping_error(greth->dev, dma_addr)) {
253 if (netif_msg_ifup(greth))
254 dev_err(greth->dev, "Could not create initial DMA mapping\n");
257 greth->rx_skbuff[i] = skb;
258 greth_write_bd(&rx_bd[i].addr, dma_addr);
259 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
264 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
265 for (i = 0; i < GRETH_RXBD_NUM; i++) {
267 greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
269 if (greth->rx_bufs[i] == NULL) {
270 if (netif_msg_ifup(greth))
271 dev_err(greth->dev, "Error allocating DMA ring.\n");
275 dma_addr = dma_map_single(greth->dev,
280 if (dma_mapping_error(greth->dev, dma_addr)) {
281 if (netif_msg_ifup(greth))
282 dev_err(greth->dev, "Could not create initial DMA mapping\n");
285 greth_write_bd(&rx_bd[i].addr, dma_addr);
286 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
288 for (i = 0; i < GRETH_TXBD_NUM; i++) {
290 greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
292 if (greth->tx_bufs[i] == NULL) {
293 if (netif_msg_ifup(greth))
294 dev_err(greth->dev, "Error allocating DMA ring.\n");
298 dma_addr = dma_map_single(greth->dev,
303 if (dma_mapping_error(greth->dev, dma_addr)) {
304 if (netif_msg_ifup(greth))
305 dev_err(greth->dev, "Could not create initial DMA mapping\n");
308 greth_write_bd(&tx_bd[i].addr, dma_addr);
309 greth_write_bd(&tx_bd[i].stat, 0);
312 greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
313 greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
315 /* Initialize pointers. */
319 greth->tx_free = GRETH_TXBD_NUM;
321 /* Initialize descriptor base address */
322 GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
323 GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
328 greth_clean_rings(greth);
332 static int greth_open(struct net_device *dev)
334 struct greth_private *greth = netdev_priv(dev);
337 err = greth_init_rings(greth);
339 if (netif_msg_ifup(greth))
340 dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
344 err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
346 if (netif_msg_ifup(greth))
347 dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
348 greth_clean_rings(greth);
352 if (netif_msg_ifup(greth))
353 dev_dbg(&dev->dev, " starting queue\n");
354 netif_start_queue(dev);
356 napi_enable(&greth->napi);
358 greth_enable_irqs(greth);
359 greth_enable_tx(greth);
360 greth_enable_rx(greth);
365 static int greth_close(struct net_device *dev)
367 struct greth_private *greth = netdev_priv(dev);
369 napi_disable(&greth->napi);
371 greth_disable_tx(greth);
373 netif_stop_queue(dev);
375 free_irq(greth->irq, (void *) dev);
377 greth_clean_rings(greth);
382 static int greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
384 struct greth_private *greth = netdev_priv(dev);
385 struct greth_bd *bdp;
386 int err = NETDEV_TX_OK;
387 u32 status, dma_addr;
389 bdp = greth->tx_bd_base + greth->tx_next;
391 if (unlikely(greth->tx_free <= 0)) {
392 netif_stop_queue(dev);
393 return NETDEV_TX_BUSY;
396 if (netif_msg_pktdata(greth))
397 greth_print_tx_packet(skb);
400 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
401 dev->stats.tx_errors++;
405 dma_addr = greth_read_bd(&bdp->addr);
407 memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
409 dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
411 status = GRETH_BD_EN | (skb->len & GRETH_BD_LEN);
413 /* Wrap around descriptor ring */
414 if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
415 status |= GRETH_BD_WR;
418 greth->tx_next = NEXT_TX(greth->tx_next);
421 /* No more descriptors */
422 if (unlikely(greth->tx_free == 0)) {
424 /* Free transmitted descriptors */
427 /* If nothing was cleaned, stop queue & wait for irq */
428 if (unlikely(greth->tx_free == 0)) {
429 status |= GRETH_BD_IE;
430 netif_stop_queue(dev);
434 /* Write descriptor control word and enable transmission */
435 greth_write_bd(&bdp->stat, status);
436 greth_enable_tx(greth);
444 static int greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
446 struct greth_private *greth = netdev_priv(dev);
447 struct greth_bd *bdp;
448 u32 status = 0, dma_addr;
449 int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
451 nr_frags = skb_shinfo(skb)->nr_frags;
453 if (greth->tx_free < nr_frags + 1) {
454 netif_stop_queue(dev);
455 err = NETDEV_TX_BUSY;
459 if (netif_msg_pktdata(greth))
460 greth_print_tx_packet(skb);
462 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
463 dev->stats.tx_errors++;
467 /* Save skb pointer. */
468 greth->tx_skbuff[greth->tx_next] = skb;
472 status = GRETH_TXBD_MORE;
474 status |= GRETH_TXBD_CSALL;
475 status |= skb_headlen(skb) & GRETH_BD_LEN;
476 if (greth->tx_next == GRETH_TXBD_NUM_MASK)
477 status |= GRETH_BD_WR;
480 bdp = greth->tx_bd_base + greth->tx_next;
481 greth_write_bd(&bdp->stat, status);
482 dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
484 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
487 greth_write_bd(&bdp->addr, dma_addr);
489 curr_tx = NEXT_TX(greth->tx_next);
492 for (i = 0; i < nr_frags; i++) {
493 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
494 greth->tx_skbuff[curr_tx] = NULL;
495 bdp = greth->tx_bd_base + curr_tx;
497 status = GRETH_TXBD_CSALL;
498 status |= frag->size & GRETH_BD_LEN;
500 /* Wrap around descriptor ring */
501 if (curr_tx == GRETH_TXBD_NUM_MASK)
502 status |= GRETH_BD_WR;
504 /* More fragments left */
505 if (i < nr_frags - 1)
506 status |= GRETH_TXBD_MORE;
508 /* ... last fragment, check if out of descriptors */
509 else if (greth->tx_free - nr_frags - 1 < (MAX_SKB_FRAGS + 1)) {
511 /* Enable interrupts and stop queue */
512 status |= GRETH_BD_IE;
513 netif_stop_queue(dev);
516 greth_write_bd(&bdp->stat, status);
518 dma_addr = dma_map_page(greth->dev,
524 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
527 greth_write_bd(&bdp->addr, dma_addr);
529 curr_tx = NEXT_TX(curr_tx);
534 /* Enable the descriptors that we configured ... */
535 for (i = 0; i < nr_frags + 1; i++) {
536 bdp = greth->tx_bd_base + greth->tx_next;
537 greth_write_bd(&bdp->stat, greth_read_bd(&bdp->stat) | GRETH_BD_EN);
538 greth->tx_next = NEXT_TX(greth->tx_next);
542 greth_enable_tx(greth);
547 /* Unmap SKB mappings that succeeded */
548 for (i = 0; greth->tx_next + i != curr_tx; i++) {
549 bdp = greth->tx_bd_base + greth->tx_next + i;
550 dma_unmap_single(greth->dev,
551 greth_read_bd(&bdp->addr),
552 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
557 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
566 static irqreturn_t greth_interrupt(int irq, void *dev_id)
568 struct net_device *dev = dev_id;
569 struct greth_private *greth;
571 irqreturn_t retval = IRQ_NONE;
573 greth = netdev_priv(dev);
575 spin_lock(&greth->devlock);
577 /* Get the interrupt events that caused us to be here. */
578 status = GRETH_REGLOAD(greth->regs->status);
580 /* Handle rx and tx interrupts through poll */
581 if (status & (GRETH_INT_RX | GRETH_INT_TX)) {
583 /* Clear interrupt status */
584 GRETH_REGORIN(greth->regs->status,
585 status & (GRETH_INT_RX | GRETH_INT_TX));
587 retval = IRQ_HANDLED;
589 /* Disable interrupts and schedule poll() */
590 greth_disable_irqs(greth);
591 napi_schedule(&greth->napi);
595 spin_unlock(&greth->devlock);
600 static void greth_clean_tx(struct net_device *dev)
602 struct greth_private *greth;
603 struct greth_bd *bdp;
606 greth = netdev_priv(dev);
609 bdp = greth->tx_bd_base + greth->tx_last;
610 stat = greth_read_bd(&bdp->stat);
612 if (unlikely(stat & GRETH_BD_EN))
615 if (greth->tx_free == GRETH_TXBD_NUM)
618 /* Check status for errors */
619 if (unlikely(stat & GRETH_TXBD_STATUS)) {
620 dev->stats.tx_errors++;
621 if (stat & GRETH_TXBD_ERR_AL)
622 dev->stats.tx_aborted_errors++;
623 if (stat & GRETH_TXBD_ERR_UE)
624 dev->stats.tx_fifo_errors++;
626 dev->stats.tx_packets++;
627 greth->tx_last = NEXT_TX(greth->tx_last);
631 if (greth->tx_free > 0) {
632 netif_wake_queue(dev);
637 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
639 /* Check status for errors */
640 if (unlikely(stat & GRETH_TXBD_STATUS)) {
641 dev->stats.tx_errors++;
642 if (stat & GRETH_TXBD_ERR_AL)
643 dev->stats.tx_aborted_errors++;
644 if (stat & GRETH_TXBD_ERR_UE)
645 dev->stats.tx_fifo_errors++;
646 if (stat & GRETH_TXBD_ERR_LC)
647 dev->stats.tx_aborted_errors++;
649 dev->stats.tx_packets++;
652 static void greth_clean_tx_gbit(struct net_device *dev)
654 struct greth_private *greth;
655 struct greth_bd *bdp, *bdp_last_frag;
660 greth = netdev_priv(dev);
662 while (greth->tx_free < GRETH_TXBD_NUM) {
664 skb = greth->tx_skbuff[greth->tx_last];
666 nr_frags = skb_shinfo(skb)->nr_frags;
668 /* We only clean fully completed SKBs */
669 bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);
670 stat = bdp_last_frag->stat;
672 if (stat & GRETH_BD_EN)
675 greth->tx_skbuff[greth->tx_last] = NULL;
677 greth_update_tx_stats(dev, stat);
679 bdp = greth->tx_bd_base + greth->tx_last;
681 greth->tx_last = NEXT_TX(greth->tx_last);
683 dma_unmap_single(greth->dev,
684 greth_read_bd(&bdp->addr),
688 for (i = 0; i < nr_frags; i++) {
689 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
690 bdp = greth->tx_bd_base + greth->tx_last;
692 dma_unmap_page(greth->dev,
693 greth_read_bd(&bdp->addr),
697 greth->tx_last = NEXT_TX(greth->tx_last);
699 greth->tx_free += nr_frags+1;
702 if (greth->tx_free > (MAX_SKB_FRAGS + 1)) {
703 netif_wake_queue(dev);
707 static int greth_pending_packets(struct greth_private *greth)
709 struct greth_bd *bdp;
711 bdp = greth->rx_bd_base + greth->rx_cur;
712 status = greth_read_bd(&bdp->stat);
713 if (status & GRETH_BD_EN)
719 static int greth_rx(struct net_device *dev, int limit)
721 struct greth_private *greth;
722 struct greth_bd *bdp;
726 u32 status, dma_addr;
728 greth = netdev_priv(dev);
730 for (count = 0; count < limit; ++count) {
732 bdp = greth->rx_bd_base + greth->rx_cur;
733 status = greth_read_bd(&bdp->stat);
734 dma_addr = greth_read_bd(&bdp->addr);
737 if (unlikely(status & GRETH_BD_EN)) {
741 /* Check status for errors. */
742 if (unlikely(status & GRETH_RXBD_STATUS)) {
743 if (status & GRETH_RXBD_ERR_FT) {
744 dev->stats.rx_length_errors++;
747 if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
748 dev->stats.rx_frame_errors++;
751 if (status & GRETH_RXBD_ERR_CRC) {
752 dev->stats.rx_crc_errors++;
757 dev->stats.rx_errors++;
761 pkt_len = status & GRETH_BD_LEN;
763 skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
765 if (unlikely(skb == NULL)) {
768 dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
770 dev->stats.rx_dropped++;
773 skb_reserve(skb, NET_IP_ALIGN);
776 dma_sync_single_for_cpu(greth->dev,
781 if (netif_msg_pktdata(greth))
782 greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
784 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
786 skb->protocol = eth_type_trans(skb, dev);
787 dev->stats.rx_packets++;
788 netif_receive_skb(skb);
792 status = GRETH_BD_EN | GRETH_BD_IE;
793 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
794 status |= GRETH_BD_WR;
798 greth_write_bd(&bdp->stat, status);
800 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
802 greth_enable_rx(greth);
804 greth->rx_cur = NEXT_RX(greth->rx_cur);
810 static inline int hw_checksummed(u32 status)
813 if (status & GRETH_RXBD_IP_FRAG)
816 if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
819 if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
822 if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
828 static int greth_rx_gbit(struct net_device *dev, int limit)
830 struct greth_private *greth;
831 struct greth_bd *bdp;
832 struct sk_buff *skb, *newskb;
835 u32 status, dma_addr;
837 greth = netdev_priv(dev);
839 for (count = 0; count < limit; ++count) {
841 bdp = greth->rx_bd_base + greth->rx_cur;
842 skb = greth->rx_skbuff[greth->rx_cur];
843 status = greth_read_bd(&bdp->stat);
846 if (status & GRETH_BD_EN)
849 /* Check status for errors. */
850 if (unlikely(status & GRETH_RXBD_STATUS)) {
852 if (status & GRETH_RXBD_ERR_FT) {
853 dev->stats.rx_length_errors++;
856 (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
857 dev->stats.rx_frame_errors++;
859 } else if (status & GRETH_RXBD_ERR_CRC) {
860 dev->stats.rx_crc_errors++;
865 /* Allocate new skb to replace current */
866 newskb = netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN);
868 if (!bad && newskb) {
869 skb_reserve(newskb, NET_IP_ALIGN);
871 dma_addr = dma_map_single(greth->dev,
873 MAX_FRAME_SIZE + NET_IP_ALIGN,
876 if (!dma_mapping_error(greth->dev, dma_addr)) {
877 /* Process the incoming frame. */
878 pkt_len = status & GRETH_BD_LEN;
880 dma_unmap_single(greth->dev,
881 greth_read_bd(&bdp->addr),
882 MAX_FRAME_SIZE + NET_IP_ALIGN,
885 if (netif_msg_pktdata(greth))
886 greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
888 skb_put(skb, pkt_len);
890 if (greth->flags & GRETH_FLAG_RX_CSUM && hw_checksummed(status))
891 skb->ip_summed = CHECKSUM_UNNECESSARY;
893 skb->ip_summed = CHECKSUM_NONE;
896 skb->protocol = eth_type_trans(skb, dev);
897 dev->stats.rx_packets++;
898 netif_receive_skb(skb);
900 greth->rx_skbuff[greth->rx_cur] = newskb;
901 greth_write_bd(&bdp->addr, dma_addr);
904 dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
905 dev_kfree_skb(newskb);
906 dev->stats.rx_dropped++;
910 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
911 dev->stats.rx_dropped++;
914 status = GRETH_BD_EN | GRETH_BD_IE;
915 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
916 status |= GRETH_BD_WR;
920 greth_write_bd(&bdp->stat, status);
921 greth_enable_rx(greth);
922 greth->rx_cur = NEXT_RX(greth->rx_cur);
929 static int greth_poll(struct napi_struct *napi, int budget)
931 struct greth_private *greth;
933 greth = container_of(napi, struct greth_private, napi);
935 if (greth->gbit_mac) {
936 greth_clean_tx_gbit(greth->netdev);
938 greth_clean_tx(greth->netdev);
942 if (greth->gbit_mac) {
943 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
945 work_done += greth_rx(greth->netdev, budget - work_done);
948 if (work_done < budget) {
952 if (greth_pending_packets(greth)) {
953 napi_reschedule(napi);
958 greth_enable_irqs(greth);
962 static int greth_set_mac_add(struct net_device *dev, void *p)
964 struct sockaddr *addr = p;
965 struct greth_private *greth;
966 struct greth_regs *regs;
968 greth = (struct greth_private *) netdev_priv(dev);
969 regs = (struct greth_regs *) greth->regs;
971 if (!is_valid_ether_addr(addr->sa_data))
974 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
976 GRETH_REGSAVE(regs->esa_msb, addr->sa_data[0] << 8 | addr->sa_data[1]);
977 GRETH_REGSAVE(regs->esa_lsb,
978 addr->sa_data[2] << 24 | addr->
979 sa_data[3] << 16 | addr->sa_data[4] << 8 | addr->sa_data[5]);
983 static u32 greth_hash_get_index(__u8 *addr)
985 return (ether_crc(6, addr)) & 0x3F;
988 static void greth_set_hash_filter(struct net_device *dev)
990 struct dev_mc_list *curr;
991 struct greth_private *greth = (struct greth_private *) netdev_priv(dev);
992 struct greth_regs *regs = (struct greth_regs *) greth->regs;
994 unsigned int i, bitnr;
996 mc_filter[0] = mc_filter[1] = 0;
1000 for (i = 0; i < dev->mc_count; i++, curr = curr->next) {
1003 break; /* unexpected end of list */
1005 bitnr = greth_hash_get_index(curr->dmi_addr);
1006 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1009 GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1010 GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1013 static void greth_set_multicast_list(struct net_device *dev)
1016 struct greth_private *greth = netdev_priv(dev);
1017 struct greth_regs *regs = (struct greth_regs *) greth->regs;
1019 cfg = GRETH_REGLOAD(regs->control);
1020 if (dev->flags & IFF_PROMISC)
1021 cfg |= GRETH_CTRL_PR;
1023 cfg &= ~GRETH_CTRL_PR;
1025 if (greth->multicast) {
1026 if (dev->flags & IFF_ALLMULTI) {
1027 GRETH_REGSAVE(regs->hash_msb, -1);
1028 GRETH_REGSAVE(regs->hash_lsb, -1);
1029 cfg |= GRETH_CTRL_MCEN;
1030 GRETH_REGSAVE(regs->control, cfg);
1034 if (dev->mc_count == 0) {
1035 cfg &= ~GRETH_CTRL_MCEN;
1036 GRETH_REGSAVE(regs->control, cfg);
1040 /* Setup multicast filter */
1041 greth_set_hash_filter(dev);
1042 cfg |= GRETH_CTRL_MCEN;
1044 GRETH_REGSAVE(regs->control, cfg);
1047 static u32 greth_get_msglevel(struct net_device *dev)
1049 struct greth_private *greth = netdev_priv(dev);
1050 return greth->msg_enable;
1053 static void greth_set_msglevel(struct net_device *dev, u32 value)
1055 struct greth_private *greth = netdev_priv(dev);
1056 greth->msg_enable = value;
1058 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1060 struct greth_private *greth = netdev_priv(dev);
1061 struct phy_device *phy = greth->phy;
1066 return phy_ethtool_gset(phy, cmd);
1069 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1071 struct greth_private *greth = netdev_priv(dev);
1072 struct phy_device *phy = greth->phy;
1077 return phy_ethtool_sset(phy, cmd);
1080 static int greth_get_regs_len(struct net_device *dev)
1082 return sizeof(struct greth_regs);
1085 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1087 struct greth_private *greth = netdev_priv(dev);
1089 strncpy(info->driver, dev_driver_string(greth->dev), 32);
1090 strncpy(info->version, "revision: 1.0", 32);
1091 strncpy(info->bus_info, greth->dev->bus->name, 32);
1092 strncpy(info->fw_version, "N/A", 32);
1093 info->eedump_len = 0;
1094 info->regdump_len = sizeof(struct greth_regs);
1097 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1100 struct greth_private *greth = netdev_priv(dev);
1101 u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1104 for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1105 buff[i] = greth_read_bd(&greth_regs[i]);
1108 static u32 greth_get_rx_csum(struct net_device *dev)
1110 struct greth_private *greth = netdev_priv(dev);
1111 return (greth->flags & GRETH_FLAG_RX_CSUM) != 0;
1114 static int greth_set_rx_csum(struct net_device *dev, u32 data)
1116 struct greth_private *greth = netdev_priv(dev);
1118 spin_lock_bh(&greth->devlock);
1121 greth->flags |= GRETH_FLAG_RX_CSUM;
1123 greth->flags &= ~GRETH_FLAG_RX_CSUM;
1125 spin_unlock_bh(&greth->devlock);
1130 static u32 greth_get_tx_csum(struct net_device *dev)
1132 return (dev->features & NETIF_F_IP_CSUM) != 0;
1135 static int greth_set_tx_csum(struct net_device *dev, u32 data)
1137 netif_tx_lock_bh(dev);
1138 ethtool_op_set_tx_csum(dev, data);
1139 netif_tx_unlock_bh(dev);
1143 static const struct ethtool_ops greth_ethtool_ops = {
1144 .get_msglevel = greth_get_msglevel,
1145 .set_msglevel = greth_set_msglevel,
1146 .get_settings = greth_get_settings,
1147 .set_settings = greth_set_settings,
1148 .get_drvinfo = greth_get_drvinfo,
1149 .get_regs_len = greth_get_regs_len,
1150 .get_regs = greth_get_regs,
1151 .get_rx_csum = greth_get_rx_csum,
1152 .set_rx_csum = greth_set_rx_csum,
1153 .get_tx_csum = greth_get_tx_csum,
1154 .set_tx_csum = greth_set_tx_csum,
1155 .get_link = ethtool_op_get_link,
1158 static struct net_device_ops greth_netdev_ops = {
1159 .ndo_open = greth_open,
1160 .ndo_stop = greth_close,
1161 .ndo_start_xmit = greth_start_xmit,
1162 .ndo_set_mac_address = greth_set_mac_add,
1165 static inline int wait_for_mdio(struct greth_private *greth)
1167 unsigned long timeout = jiffies + 4*HZ/100;
1168 while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1169 if (time_after(jiffies, timeout))
1175 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1177 struct greth_private *greth = bus->priv;
1180 if (!wait_for_mdio(greth))
1183 GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1185 if (!wait_for_mdio(greth))
1188 if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1189 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1197 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1199 struct greth_private *greth = bus->priv;
1201 if (!wait_for_mdio(greth))
1204 GRETH_REGSAVE(greth->regs->mdio,
1205 ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1207 if (!wait_for_mdio(greth))
1213 static int greth_mdio_reset(struct mii_bus *bus)
1218 static void greth_link_change(struct net_device *dev)
1220 struct greth_private *greth = netdev_priv(dev);
1221 struct phy_device *phydev = greth->phy;
1222 unsigned long flags;
1224 int status_change = 0;
1226 spin_lock_irqsave(&greth->devlock, flags);
1230 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1232 GRETH_REGANDIN(greth->regs->control,
1233 ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB));
1236 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_FD);
1238 if (phydev->speed == SPEED_100) {
1240 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_SP);
1243 else if (phydev->speed == SPEED_1000)
1244 GRETH_REGORIN(greth->regs->control, GRETH_CTRL_GB);
1246 greth->speed = phydev->speed;
1247 greth->duplex = phydev->duplex;
1252 if (phydev->link != greth->link) {
1253 if (!phydev->link) {
1257 greth->link = phydev->link;
1262 spin_unlock_irqrestore(&greth->devlock, flags);
1264 if (status_change) {
1266 pr_debug("%s: link up (%d/%s)\n",
1267 dev->name, phydev->speed,
1268 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1270 pr_debug("%s: link down\n", dev->name);
1274 static int greth_mdio_probe(struct net_device *dev)
1276 struct greth_private *greth = netdev_priv(dev);
1277 struct phy_device *phy = NULL;
1281 /* Find the first PHY */
1282 for (i = 0; i < PHY_MAX_ADDR; i++) {
1283 if (greth->mdio->phy_map[i]) {
1284 phy = greth->mdio->phy_map[i];
1289 if (netif_msg_probe(greth))
1290 dev_err(&dev->dev, "no PHY found\n");
1294 if (greth->gbit_mac)
1295 interface = PHY_INTERFACE_MODE_GMII;
1297 interface = PHY_INTERFACE_MODE_MII;
1299 phy = phy_connect(dev, dev_name(&phy->dev), &greth_link_change, 0, interface);
1301 if (greth->gbit_mac)
1302 phy->supported &= PHY_GBIT_FEATURES;
1304 phy->supported &= PHY_BASIC_FEATURES;
1306 phy->advertising = phy->supported;
1309 if (netif_msg_ifup(greth))
1310 dev_err(&dev->dev, "could not attach to PHY\n");
1311 return PTR_ERR(phy);
1322 static inline int phy_aneg_done(struct phy_device *phydev)
1326 retval = phy_read(phydev, MII_BMSR);
1328 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1331 static int greth_mdio_init(struct greth_private *greth)
1334 unsigned long timeout;
1336 greth->mdio = mdiobus_alloc();
1341 greth->mdio->name = "greth-mdio";
1342 snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1343 greth->mdio->read = greth_mdio_read;
1344 greth->mdio->write = greth_mdio_write;
1345 greth->mdio->reset = greth_mdio_reset;
1346 greth->mdio->priv = greth;
1348 greth->mdio->irq = greth->mdio_irqs;
1350 for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1351 greth->mdio->irq[phy] = PHY_POLL;
1353 ret = mdiobus_register(greth->mdio);
1358 ret = greth_mdio_probe(greth->netdev);
1360 if (netif_msg_probe(greth))
1361 dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1365 phy_start(greth->phy);
1367 /* If Ethernet debug link is used make autoneg happen right away */
1368 if (greth->edcl && greth_edcl == 1) {
1369 phy_start_aneg(greth->phy);
1370 timeout = jiffies + 6*HZ;
1371 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1373 genphy_read_status(greth->phy);
1374 greth_link_change(greth->netdev);
1380 mdiobus_unregister(greth->mdio);
1382 mdiobus_free(greth->mdio);
1386 /* Initialize the GRETH MAC */
1387 static int __devinit greth_of_probe(struct of_device *ofdev, const struct of_device_id *match)
1389 struct net_device *dev;
1390 struct greth_private *greth;
1391 struct greth_regs *regs;
1396 unsigned long timeout;
1398 dev = alloc_etherdev(sizeof(struct greth_private));
1403 greth = netdev_priv(dev);
1404 greth->netdev = dev;
1405 greth->dev = &ofdev->dev;
1407 if (greth_debug > 0)
1408 greth->msg_enable = greth_debug;
1410 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1412 spin_lock_init(&greth->devlock);
1414 greth->regs = of_ioremap(&ofdev->resource[0], 0,
1415 resource_size(&ofdev->resource[0]),
1416 "grlib-greth regs");
1418 if (greth->regs == NULL) {
1419 if (netif_msg_probe(greth))
1420 dev_err(greth->dev, "ioremap failure.\n");
1425 regs = (struct greth_regs *) greth->regs;
1426 greth->irq = ofdev->irqs[0];
1428 dev_set_drvdata(greth->dev, dev);
1429 SET_NETDEV_DEV(dev, greth->dev);
1431 if (netif_msg_probe(greth))
1432 dev_dbg(greth->dev, "reseting controller.\n");
1434 /* Reset the controller. */
1435 GRETH_REGSAVE(regs->control, GRETH_RESET);
1437 /* Wait for MAC to reset itself */
1438 timeout = jiffies + HZ/100;
1439 while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1440 if (time_after(jiffies, timeout)) {
1442 if (netif_msg_probe(greth))
1443 dev_err(greth->dev, "timeout when waiting for reset.\n");
1448 /* Get default PHY address */
1449 greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1451 /* Check if we have GBIT capable MAC */
1452 tmp = GRETH_REGLOAD(regs->control);
1453 greth->gbit_mac = (tmp >> 27) & 1;
1455 /* Check for multicast capability */
1456 greth->multicast = (tmp >> 25) & 1;
1458 greth->edcl = (tmp >> 31) & 1;
1460 /* If we have EDCL we disable the EDCL speed-duplex FSM so
1461 * it doesn't interfere with the software */
1462 if (greth->edcl != 0)
1463 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1465 /* Check if MAC can handle MDIO interrupts */
1466 greth->mdio_int_en = (tmp >> 26) & 1;
1468 err = greth_mdio_init(greth);
1470 if (netif_msg_probe(greth))
1471 dev_err(greth->dev, "failed to register MDIO bus\n");
1475 /* Allocate TX descriptor ring in coherent memory */
1476 greth->tx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1478 &greth->tx_bd_base_phys,
1481 if (!greth->tx_bd_base) {
1482 if (netif_msg_probe(greth))
1483 dev_err(&dev->dev, "could not allocate descriptor memory.\n");
1488 memset(greth->tx_bd_base, 0, 1024);
1490 /* Allocate RX descriptor ring in coherent memory */
1491 greth->rx_bd_base = (struct greth_bd *) dma_alloc_coherent(greth->dev,
1493 &greth->rx_bd_base_phys,
1496 if (!greth->rx_bd_base) {
1497 if (netif_msg_probe(greth))
1498 dev_err(greth->dev, "could not allocate descriptor memory.\n");
1503 memset(greth->rx_bd_base, 0, 1024);
1505 /* Get MAC address from: module param, OF property or ID prom */
1506 for (i = 0; i < 6; i++) {
1507 if (macaddr[i] != 0)
1511 const unsigned char *addr;
1513 addr = of_get_property(ofdev->node, "local-mac-address", &len);
1514 if (addr != NULL && len == 6) {
1515 for (i = 0; i < 6; i++)
1516 macaddr[i] = (unsigned int) addr[i];
1519 for (i = 0; i < 6; i++)
1520 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1525 for (i = 0; i < 6; i++)
1526 dev->dev_addr[i] = macaddr[i];
1530 if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1531 if (netif_msg_probe(greth))
1532 dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1537 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1538 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1539 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1541 /* Clear all pending interrupts except PHY irq */
1542 GRETH_REGSAVE(regs->status, 0xFF);
1544 if (greth->gbit_mac) {
1545 dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_HIGHDMA;
1546 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1547 greth->flags = GRETH_FLAG_RX_CSUM;
1550 if (greth->multicast) {
1551 greth_netdev_ops.ndo_set_multicast_list = greth_set_multicast_list;
1552 dev->flags |= IFF_MULTICAST;
1554 dev->flags &= ~IFF_MULTICAST;
1557 dev->netdev_ops = &greth_netdev_ops;
1558 dev->ethtool_ops = &greth_ethtool_ops;
1560 if (register_netdev(dev)) {
1561 if (netif_msg_probe(greth))
1562 dev_err(greth->dev, "netdevice registration failed.\n");
1568 memset(&greth->napi, 0, sizeof(greth->napi));
1569 netif_napi_add(dev, &greth->napi, greth_poll, 64);
1574 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1576 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1578 mdiobus_unregister(greth->mdio);
1580 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1586 static int __devexit greth_of_remove(struct of_device *of_dev)
1588 struct net_device *ndev = dev_get_drvdata(&of_dev->dev);
1589 struct greth_private *greth = netdev_priv(ndev);
1591 /* Free descriptor areas */
1592 dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1594 dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1596 dev_set_drvdata(&of_dev->dev, NULL);
1599 phy_stop(greth->phy);
1600 mdiobus_unregister(greth->mdio);
1602 unregister_netdev(ndev);
1605 of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1610 static struct of_device_id greth_of_match[] = {
1612 .name = "GAISLER_ETHMAC",
1617 MODULE_DEVICE_TABLE(of, greth_of_match);
1619 static struct of_platform_driver greth_of_driver = {
1620 .name = "grlib-greth",
1621 .match_table = greth_of_match,
1622 .probe = greth_of_probe,
1623 .remove = __devexit_p(greth_of_remove),
1625 .owner = THIS_MODULE,
1626 .name = "grlib-greth",
1630 static int __init greth_init(void)
1632 return of_register_platform_driver(&greth_of_driver);
1635 static void __exit greth_cleanup(void)
1637 of_unregister_platform_driver(&greth_of_driver);
1640 module_init(greth_init);
1641 module_exit(greth_cleanup);
1643 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1644 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1645 MODULE_LICENSE("GPL");