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/interrupt.h>
29 #include <linux/netdevice.h>
30 #include <linux/etherdevice.h>
31 #include <linux/ethtool.h>
32 #include <linux/skbuff.h>
34 #include <linux/crc32.h>
35 #include <linux/mii.h>
36 #include <linux/of_device.h>
37 #include <linux/of_platform.h>
38 #include <linux/slab.h>
39 #include <asm/cacheflush.h>
40 #include <asm/byteorder.h>
43 #include <asm/idprom.h>
48 #define GRETH_DEF_MSG_ENABLE \
57 static int greth_debug = -1; /* -1 == use GRETH_DEF_MSG_ENABLE as value */
58 module_param(greth_debug, int, 0);
59 MODULE_PARM_DESC(greth_debug, "GRETH bitmapped debugging message enable value");
61 /* Accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
62 static int macaddr[6];
63 module_param_array(macaddr, int, NULL, 0);
64 MODULE_PARM_DESC(macaddr, "GRETH Ethernet MAC address");
66 static int greth_edcl = 1;
67 module_param(greth_edcl, int, 0);
68 MODULE_PARM_DESC(greth_edcl, "GRETH EDCL usage indicator. Set to 1 if EDCL is used.");
70 static int greth_open(struct net_device *dev);
71 static netdev_tx_t greth_start_xmit(struct sk_buff *skb,
72 struct net_device *dev);
73 static netdev_tx_t greth_start_xmit_gbit(struct sk_buff *skb,
74 struct net_device *dev);
75 static int greth_rx(struct net_device *dev, int limit);
76 static int greth_rx_gbit(struct net_device *dev, int limit);
77 static void greth_clean_tx(struct net_device *dev);
78 static void greth_clean_tx_gbit(struct net_device *dev);
79 static irqreturn_t greth_interrupt(int irq, void *dev_id);
80 static int greth_close(struct net_device *dev);
81 static int greth_set_mac_add(struct net_device *dev, void *p);
82 static void greth_set_multicast_list(struct net_device *dev);
84 #define GRETH_REGLOAD(a) (be32_to_cpu(__raw_readl(&(a))))
85 #define GRETH_REGSAVE(a, v) (__raw_writel(cpu_to_be32(v), &(a)))
86 #define GRETH_REGORIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) | (v))))
87 #define GRETH_REGANDIN(a, v) (GRETH_REGSAVE(a, (GRETH_REGLOAD(a) & (v))))
89 #define NEXT_TX(N) (((N) + 1) & GRETH_TXBD_NUM_MASK)
90 #define SKIP_TX(N, C) (((N) + C) & GRETH_TXBD_NUM_MASK)
91 #define NEXT_RX(N) (((N) + 1) & GRETH_RXBD_NUM_MASK)
93 static void greth_print_rx_packet(void *addr, int len)
95 print_hex_dump(KERN_DEBUG, "RX: ", DUMP_PREFIX_OFFSET, 16, 1,
99 static void greth_print_tx_packet(struct sk_buff *skb)
104 if (skb_shinfo(skb)->nr_frags == 0)
107 length = skb_headlen(skb);
109 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
110 skb->data, length, true);
112 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
114 print_hex_dump(KERN_DEBUG, "TX: ", DUMP_PREFIX_OFFSET, 16, 1,
115 skb_frag_address(&skb_shinfo(skb)->frags[i]),
116 skb_shinfo(skb)->frags[i].size, true);
120 static inline void greth_enable_tx(struct greth_private *greth)
123 GRETH_REGORIN(greth->regs->control, GRETH_TXEN);
126 static inline void greth_enable_tx_and_irq(struct greth_private *greth)
128 wmb(); /* BDs must been written to memory before enabling TX */
129 GRETH_REGORIN(greth->regs->control, GRETH_TXEN | GRETH_TXI);
132 static inline void greth_disable_tx(struct greth_private *greth)
134 GRETH_REGANDIN(greth->regs->control, ~GRETH_TXEN);
137 static inline void greth_enable_rx(struct greth_private *greth)
140 GRETH_REGORIN(greth->regs->control, GRETH_RXEN);
143 static inline void greth_disable_rx(struct greth_private *greth)
145 GRETH_REGANDIN(greth->regs->control, ~GRETH_RXEN);
148 static inline void greth_enable_irqs(struct greth_private *greth)
150 GRETH_REGORIN(greth->regs->control, GRETH_RXI | GRETH_TXI);
153 static inline void greth_disable_irqs(struct greth_private *greth)
155 GRETH_REGANDIN(greth->regs->control, ~(GRETH_RXI|GRETH_TXI));
158 static inline void greth_write_bd(u32 *bd, u32 val)
160 __raw_writel(cpu_to_be32(val), bd);
163 static inline u32 greth_read_bd(u32 *bd)
165 return be32_to_cpu(__raw_readl(bd));
168 static void greth_clean_rings(struct greth_private *greth)
171 struct greth_bd *rx_bdp = greth->rx_bd_base;
172 struct greth_bd *tx_bdp = greth->tx_bd_base;
174 if (greth->gbit_mac) {
176 /* Free and unmap RX buffers */
177 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
178 if (greth->rx_skbuff[i] != NULL) {
179 dev_kfree_skb(greth->rx_skbuff[i]);
180 dma_unmap_single(greth->dev,
181 greth_read_bd(&rx_bdp->addr),
182 MAX_FRAME_SIZE+NET_IP_ALIGN,
188 while (greth->tx_free < GRETH_TXBD_NUM) {
190 struct sk_buff *skb = greth->tx_skbuff[greth->tx_last];
191 int nr_frags = skb_shinfo(skb)->nr_frags;
192 tx_bdp = greth->tx_bd_base + greth->tx_last;
193 greth->tx_last = NEXT_TX(greth->tx_last);
195 dma_unmap_single(greth->dev,
196 greth_read_bd(&tx_bdp->addr),
200 for (i = 0; i < nr_frags; i++) {
201 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
202 tx_bdp = greth->tx_bd_base + greth->tx_last;
204 dma_unmap_page(greth->dev,
205 greth_read_bd(&tx_bdp->addr),
209 greth->tx_last = NEXT_TX(greth->tx_last);
211 greth->tx_free += nr_frags+1;
216 } else { /* 10/100 Mbps MAC */
218 for (i = 0; i < GRETH_RXBD_NUM; i++, rx_bdp++) {
219 kfree(greth->rx_bufs[i]);
220 dma_unmap_single(greth->dev,
221 greth_read_bd(&rx_bdp->addr),
225 for (i = 0; i < GRETH_TXBD_NUM; i++, tx_bdp++) {
226 kfree(greth->tx_bufs[i]);
227 dma_unmap_single(greth->dev,
228 greth_read_bd(&tx_bdp->addr),
235 static int greth_init_rings(struct greth_private *greth)
238 struct greth_bd *rx_bd, *tx_bd;
242 rx_bd = greth->rx_bd_base;
243 tx_bd = greth->tx_bd_base;
245 /* Initialize descriptor rings and buffers */
246 if (greth->gbit_mac) {
248 for (i = 0; i < GRETH_RXBD_NUM; i++) {
249 skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
251 if (netif_msg_ifup(greth))
252 dev_err(greth->dev, "Error allocating DMA ring.\n");
255 skb_reserve(skb, NET_IP_ALIGN);
256 dma_addr = dma_map_single(greth->dev,
258 MAX_FRAME_SIZE+NET_IP_ALIGN,
261 if (dma_mapping_error(greth->dev, dma_addr)) {
262 if (netif_msg_ifup(greth))
263 dev_err(greth->dev, "Could not create initial DMA mapping\n");
266 greth->rx_skbuff[i] = skb;
267 greth_write_bd(&rx_bd[i].addr, dma_addr);
268 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
273 /* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
274 for (i = 0; i < GRETH_RXBD_NUM; i++) {
276 greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
278 if (greth->rx_bufs[i] == NULL) {
279 if (netif_msg_ifup(greth))
280 dev_err(greth->dev, "Error allocating DMA ring.\n");
284 dma_addr = dma_map_single(greth->dev,
289 if (dma_mapping_error(greth->dev, dma_addr)) {
290 if (netif_msg_ifup(greth))
291 dev_err(greth->dev, "Could not create initial DMA mapping\n");
294 greth_write_bd(&rx_bd[i].addr, dma_addr);
295 greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
297 for (i = 0; i < GRETH_TXBD_NUM; i++) {
299 greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);
301 if (greth->tx_bufs[i] == NULL) {
302 if (netif_msg_ifup(greth))
303 dev_err(greth->dev, "Error allocating DMA ring.\n");
307 dma_addr = dma_map_single(greth->dev,
312 if (dma_mapping_error(greth->dev, dma_addr)) {
313 if (netif_msg_ifup(greth))
314 dev_err(greth->dev, "Could not create initial DMA mapping\n");
317 greth_write_bd(&tx_bd[i].addr, dma_addr);
318 greth_write_bd(&tx_bd[i].stat, 0);
321 greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
322 greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);
324 /* Initialize pointers. */
328 greth->tx_free = GRETH_TXBD_NUM;
330 /* Initialize descriptor base address */
331 GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
332 GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);
337 greth_clean_rings(greth);
341 static int greth_open(struct net_device *dev)
343 struct greth_private *greth = netdev_priv(dev);
346 err = greth_init_rings(greth);
348 if (netif_msg_ifup(greth))
349 dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
353 err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
355 if (netif_msg_ifup(greth))
356 dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
357 greth_clean_rings(greth);
361 if (netif_msg_ifup(greth))
362 dev_dbg(&dev->dev, " starting queue\n");
363 netif_start_queue(dev);
365 GRETH_REGSAVE(greth->regs->status, 0xFF);
367 napi_enable(&greth->napi);
369 greth_enable_irqs(greth);
370 greth_enable_tx(greth);
371 greth_enable_rx(greth);
376 static int greth_close(struct net_device *dev)
378 struct greth_private *greth = netdev_priv(dev);
380 napi_disable(&greth->napi);
382 greth_disable_irqs(greth);
383 greth_disable_tx(greth);
384 greth_disable_rx(greth);
386 netif_stop_queue(dev);
388 free_irq(greth->irq, (void *) dev);
390 greth_clean_rings(greth);
396 greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
398 struct greth_private *greth = netdev_priv(dev);
399 struct greth_bd *bdp;
400 int err = NETDEV_TX_OK;
401 u32 status, dma_addr, ctrl;
405 greth_clean_tx(greth->netdev);
407 if (unlikely(greth->tx_free <= 0)) {
408 spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
409 ctrl = GRETH_REGLOAD(greth->regs->control);
410 /* Enable TX IRQ only if not already in poll() routine */
411 if (ctrl & GRETH_RXI)
412 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
413 netif_stop_queue(dev);
414 spin_unlock_irqrestore(&greth->devlock, flags);
415 return NETDEV_TX_BUSY;
418 if (netif_msg_pktdata(greth))
419 greth_print_tx_packet(skb);
422 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
423 dev->stats.tx_errors++;
427 bdp = greth->tx_bd_base + greth->tx_next;
428 dma_addr = greth_read_bd(&bdp->addr);
430 memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);
432 dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);
434 status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
435 greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;
437 /* Wrap around descriptor ring */
438 if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
439 status |= GRETH_BD_WR;
442 greth->tx_next = NEXT_TX(greth->tx_next);
445 /* Write descriptor control word and enable transmission */
446 greth_write_bd(&bdp->stat, status);
447 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
448 greth_enable_tx(greth);
449 spin_unlock_irqrestore(&greth->devlock, flags);
456 static inline u16 greth_num_free_bds(u16 tx_last, u16 tx_next)
458 if (tx_next < tx_last)
459 return (tx_last - tx_next) - 1;
461 return GRETH_TXBD_NUM - (tx_next - tx_last) - 1;
465 greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
467 struct greth_private *greth = netdev_priv(dev);
468 struct greth_bd *bdp;
469 u32 status, dma_addr;
470 int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
474 nr_frags = skb_shinfo(skb)->nr_frags;
475 tx_last = greth->tx_last;
476 rmb(); /* tx_last is updated by the poll task */
478 if (greth_num_free_bds(tx_last, greth->tx_next) < nr_frags + 1) {
479 netif_stop_queue(dev);
480 err = NETDEV_TX_BUSY;
484 if (netif_msg_pktdata(greth))
485 greth_print_tx_packet(skb);
487 if (unlikely(skb->len > MAX_FRAME_SIZE)) {
488 dev->stats.tx_errors++;
492 /* Save skb pointer. */
493 greth->tx_skbuff[greth->tx_next] = skb;
497 status = GRETH_TXBD_MORE;
499 status = GRETH_BD_IE;
501 if (skb->ip_summed == CHECKSUM_PARTIAL)
502 status |= GRETH_TXBD_CSALL;
503 status |= skb_headlen(skb) & GRETH_BD_LEN;
504 if (greth->tx_next == GRETH_TXBD_NUM_MASK)
505 status |= GRETH_BD_WR;
508 bdp = greth->tx_bd_base + greth->tx_next;
509 greth_write_bd(&bdp->stat, status);
510 dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
512 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
515 greth_write_bd(&bdp->addr, dma_addr);
517 curr_tx = NEXT_TX(greth->tx_next);
520 for (i = 0; i < nr_frags; i++) {
521 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
522 greth->tx_skbuff[curr_tx] = NULL;
523 bdp = greth->tx_bd_base + curr_tx;
525 status = GRETH_BD_EN;
526 if (skb->ip_summed == CHECKSUM_PARTIAL)
527 status |= GRETH_TXBD_CSALL;
528 status |= skb_frag_size(frag) & GRETH_BD_LEN;
530 /* Wrap around descriptor ring */
531 if (curr_tx == GRETH_TXBD_NUM_MASK)
532 status |= GRETH_BD_WR;
534 /* More fragments left */
535 if (i < nr_frags - 1)
536 status |= GRETH_TXBD_MORE;
538 status |= GRETH_BD_IE; /* enable IRQ on last fragment */
540 greth_write_bd(&bdp->stat, status);
542 dma_addr = skb_frag_dma_map(greth->dev, frag, 0, skb_frag_size(frag),
545 if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
548 greth_write_bd(&bdp->addr, dma_addr);
550 curr_tx = NEXT_TX(curr_tx);
555 /* Enable the descriptor chain by enabling the first descriptor */
556 bdp = greth->tx_bd_base + greth->tx_next;
557 greth_write_bd(&bdp->stat,
558 greth_read_bd(&bdp->stat) | GRETH_BD_EN);
560 spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
561 greth->tx_next = curr_tx;
562 greth_enable_tx_and_irq(greth);
563 spin_unlock_irqrestore(&greth->devlock, flags);
568 /* Unmap SKB mappings that succeeded and disable descriptor */
569 for (i = 0; greth->tx_next + i != curr_tx; i++) {
570 bdp = greth->tx_bd_base + greth->tx_next + i;
571 dma_unmap_single(greth->dev,
572 greth_read_bd(&bdp->addr),
573 greth_read_bd(&bdp->stat) & GRETH_BD_LEN,
575 greth_write_bd(&bdp->stat, 0);
579 dev_warn(greth->dev, "Could not create TX DMA mapping\n");
585 static irqreturn_t greth_interrupt(int irq, void *dev_id)
587 struct net_device *dev = dev_id;
588 struct greth_private *greth;
590 irqreturn_t retval = IRQ_NONE;
592 greth = netdev_priv(dev);
594 spin_lock(&greth->devlock);
596 /* Get the interrupt events that caused us to be here. */
597 status = GRETH_REGLOAD(greth->regs->status);
599 /* Must see if interrupts are enabled also, INT_TX|INT_RX flags may be
600 * set regardless of whether IRQ is enabled or not. Especially
601 * important when shared IRQ.
603 ctrl = GRETH_REGLOAD(greth->regs->control);
605 /* Handle rx and tx interrupts through poll */
606 if (((status & (GRETH_INT_RE | GRETH_INT_RX)) && (ctrl & GRETH_RXI)) ||
607 ((status & (GRETH_INT_TE | GRETH_INT_TX)) && (ctrl & GRETH_TXI))) {
608 retval = IRQ_HANDLED;
610 /* Disable interrupts and schedule poll() */
611 greth_disable_irqs(greth);
612 napi_schedule(&greth->napi);
616 spin_unlock(&greth->devlock);
621 static void greth_clean_tx(struct net_device *dev)
623 struct greth_private *greth;
624 struct greth_bd *bdp;
627 greth = netdev_priv(dev);
630 bdp = greth->tx_bd_base + greth->tx_last;
631 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
633 stat = greth_read_bd(&bdp->stat);
635 if (unlikely(stat & GRETH_BD_EN))
638 if (greth->tx_free == GRETH_TXBD_NUM)
641 /* Check status for errors */
642 if (unlikely(stat & GRETH_TXBD_STATUS)) {
643 dev->stats.tx_errors++;
644 if (stat & GRETH_TXBD_ERR_AL)
645 dev->stats.tx_aborted_errors++;
646 if (stat & GRETH_TXBD_ERR_UE)
647 dev->stats.tx_fifo_errors++;
649 dev->stats.tx_packets++;
650 dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
651 greth->tx_last = NEXT_TX(greth->tx_last);
655 if (greth->tx_free > 0) {
656 netif_wake_queue(dev);
660 static inline void greth_update_tx_stats(struct net_device *dev, u32 stat)
662 /* Check status for errors */
663 if (unlikely(stat & GRETH_TXBD_STATUS)) {
664 dev->stats.tx_errors++;
665 if (stat & GRETH_TXBD_ERR_AL)
666 dev->stats.tx_aborted_errors++;
667 if (stat & GRETH_TXBD_ERR_UE)
668 dev->stats.tx_fifo_errors++;
669 if (stat & GRETH_TXBD_ERR_LC)
670 dev->stats.tx_aborted_errors++;
672 dev->stats.tx_packets++;
675 static void greth_clean_tx_gbit(struct net_device *dev)
677 struct greth_private *greth;
678 struct greth_bd *bdp, *bdp_last_frag;
679 struct sk_buff *skb = NULL;
684 greth = netdev_priv(dev);
685 tx_last = greth->tx_last;
687 while (tx_last != greth->tx_next) {
689 skb = greth->tx_skbuff[tx_last];
691 nr_frags = skb_shinfo(skb)->nr_frags;
693 /* We only clean fully completed SKBs */
694 bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);
696 GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
698 stat = greth_read_bd(&bdp_last_frag->stat);
700 if (stat & GRETH_BD_EN)
703 greth->tx_skbuff[tx_last] = NULL;
705 greth_update_tx_stats(dev, stat);
706 dev->stats.tx_bytes += skb->len;
708 bdp = greth->tx_bd_base + tx_last;
710 tx_last = NEXT_TX(tx_last);
712 dma_unmap_single(greth->dev,
713 greth_read_bd(&bdp->addr),
717 for (i = 0; i < nr_frags; i++) {
718 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
719 bdp = greth->tx_bd_base + tx_last;
721 dma_unmap_page(greth->dev,
722 greth_read_bd(&bdp->addr),
726 tx_last = NEXT_TX(tx_last);
730 if (skb) { /* skb is set only if the above while loop was entered */
732 greth->tx_last = tx_last;
734 if (netif_queue_stopped(dev) &&
735 (greth_num_free_bds(tx_last, greth->tx_next) >
737 netif_wake_queue(dev);
741 static int greth_rx(struct net_device *dev, int limit)
743 struct greth_private *greth;
744 struct greth_bd *bdp;
748 u32 status, dma_addr;
751 greth = netdev_priv(dev);
753 for (count = 0; count < limit; ++count) {
755 bdp = greth->rx_bd_base + greth->rx_cur;
756 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
758 status = greth_read_bd(&bdp->stat);
760 if (unlikely(status & GRETH_BD_EN)) {
764 dma_addr = greth_read_bd(&bdp->addr);
767 /* Check status for errors. */
768 if (unlikely(status & GRETH_RXBD_STATUS)) {
769 if (status & GRETH_RXBD_ERR_FT) {
770 dev->stats.rx_length_errors++;
773 if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
774 dev->stats.rx_frame_errors++;
777 if (status & GRETH_RXBD_ERR_CRC) {
778 dev->stats.rx_crc_errors++;
783 dev->stats.rx_errors++;
787 pkt_len = status & GRETH_BD_LEN;
789 skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);
791 if (unlikely(skb == NULL)) {
794 dev_warn(&dev->dev, "low on memory - " "packet dropped\n");
796 dev->stats.rx_dropped++;
799 skb_reserve(skb, NET_IP_ALIGN);
801 dma_sync_single_for_cpu(greth->dev,
806 if (netif_msg_pktdata(greth))
807 greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);
809 memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);
811 skb->protocol = eth_type_trans(skb, dev);
812 dev->stats.rx_bytes += pkt_len;
813 dev->stats.rx_packets++;
814 netif_receive_skb(skb);
818 status = GRETH_BD_EN | GRETH_BD_IE;
819 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
820 status |= GRETH_BD_WR;
824 greth_write_bd(&bdp->stat, status);
826 dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);
828 spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
829 greth_enable_rx(greth);
830 spin_unlock_irqrestore(&greth->devlock, flags);
832 greth->rx_cur = NEXT_RX(greth->rx_cur);
838 static inline int hw_checksummed(u32 status)
841 if (status & GRETH_RXBD_IP_FRAG)
844 if (status & GRETH_RXBD_IP && status & GRETH_RXBD_IP_CSERR)
847 if (status & GRETH_RXBD_UDP && status & GRETH_RXBD_UDP_CSERR)
850 if (status & GRETH_RXBD_TCP && status & GRETH_RXBD_TCP_CSERR)
856 static int greth_rx_gbit(struct net_device *dev, int limit)
858 struct greth_private *greth;
859 struct greth_bd *bdp;
860 struct sk_buff *skb, *newskb;
863 u32 status, dma_addr;
866 greth = netdev_priv(dev);
868 for (count = 0; count < limit; ++count) {
870 bdp = greth->rx_bd_base + greth->rx_cur;
871 skb = greth->rx_skbuff[greth->rx_cur];
872 GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
874 status = greth_read_bd(&bdp->stat);
877 if (status & GRETH_BD_EN)
880 /* Check status for errors. */
881 if (unlikely(status & GRETH_RXBD_STATUS)) {
883 if (status & GRETH_RXBD_ERR_FT) {
884 dev->stats.rx_length_errors++;
887 (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
888 dev->stats.rx_frame_errors++;
890 } else if (status & GRETH_RXBD_ERR_CRC) {
891 dev->stats.rx_crc_errors++;
896 /* Allocate new skb to replace current, not needed if the
897 * current skb can be reused */
898 if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
899 skb_reserve(newskb, NET_IP_ALIGN);
901 dma_addr = dma_map_single(greth->dev,
903 MAX_FRAME_SIZE + NET_IP_ALIGN,
906 if (!dma_mapping_error(greth->dev, dma_addr)) {
907 /* Process the incoming frame. */
908 pkt_len = status & GRETH_BD_LEN;
910 dma_unmap_single(greth->dev,
911 greth_read_bd(&bdp->addr),
912 MAX_FRAME_SIZE + NET_IP_ALIGN,
915 if (netif_msg_pktdata(greth))
916 greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);
918 skb_put(skb, pkt_len);
920 if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
921 skb->ip_summed = CHECKSUM_UNNECESSARY;
923 skb_checksum_none_assert(skb);
925 skb->protocol = eth_type_trans(skb, dev);
926 dev->stats.rx_packets++;
927 dev->stats.rx_bytes += pkt_len;
928 netif_receive_skb(skb);
930 greth->rx_skbuff[greth->rx_cur] = newskb;
931 greth_write_bd(&bdp->addr, dma_addr);
934 dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
935 dev_kfree_skb(newskb);
936 /* reusing current skb, so it is a drop */
937 dev->stats.rx_dropped++;
940 /* Bad Frame transfer, the skb is reused */
941 dev->stats.rx_dropped++;
943 /* Failed Allocating a new skb. This is rather stupid
944 * but the current "filled" skb is reused, as if
945 * transfer failure. One could argue that RX descriptor
946 * table handling should be divided into cleaning and
947 * filling as the TX part of the driver
950 dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
951 /* reusing current skb, so it is a drop */
952 dev->stats.rx_dropped++;
955 status = GRETH_BD_EN | GRETH_BD_IE;
956 if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
957 status |= GRETH_BD_WR;
961 greth_write_bd(&bdp->stat, status);
962 spin_lock_irqsave(&greth->devlock, flags);
963 greth_enable_rx(greth);
964 spin_unlock_irqrestore(&greth->devlock, flags);
965 greth->rx_cur = NEXT_RX(greth->rx_cur);
972 static int greth_poll(struct napi_struct *napi, int budget)
974 struct greth_private *greth;
978 greth = container_of(napi, struct greth_private, napi);
981 if (greth->gbit_mac) {
982 greth_clean_tx_gbit(greth->netdev);
983 work_done += greth_rx_gbit(greth->netdev, budget - work_done);
985 if (netif_queue_stopped(greth->netdev))
986 greth_clean_tx(greth->netdev);
987 work_done += greth_rx(greth->netdev, budget - work_done);
990 if (work_done < budget) {
992 spin_lock_irqsave(&greth->devlock, flags);
994 ctrl = GRETH_REGLOAD(greth->regs->control);
995 if ((greth->gbit_mac && (greth->tx_last != greth->tx_next)) ||
996 (!greth->gbit_mac && netif_queue_stopped(greth->netdev))) {
997 GRETH_REGSAVE(greth->regs->control,
998 ctrl | GRETH_TXI | GRETH_RXI);
999 mask = GRETH_INT_RX | GRETH_INT_RE |
1000 GRETH_INT_TX | GRETH_INT_TE;
1002 GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
1003 mask = GRETH_INT_RX | GRETH_INT_RE;
1006 if (GRETH_REGLOAD(greth->regs->status) & mask) {
1007 GRETH_REGSAVE(greth->regs->control, ctrl);
1008 spin_unlock_irqrestore(&greth->devlock, flags);
1009 goto restart_txrx_poll;
1011 __napi_complete(napi);
1012 spin_unlock_irqrestore(&greth->devlock, flags);
1019 static int greth_set_mac_add(struct net_device *dev, void *p)
1021 struct sockaddr *addr = p;
1022 struct greth_private *greth;
1023 struct greth_regs *regs;
1025 greth = netdev_priv(dev);
1028 if (!is_valid_ether_addr(addr->sa_data))
1029 return -EADDRNOTAVAIL;
1031 memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1032 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1033 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1034 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1039 static u32 greth_hash_get_index(__u8 *addr)
1041 return (ether_crc(6, addr)) & 0x3F;
1044 static void greth_set_hash_filter(struct net_device *dev)
1046 struct netdev_hw_addr *ha;
1047 struct greth_private *greth = netdev_priv(dev);
1048 struct greth_regs *regs = greth->regs;
1052 mc_filter[0] = mc_filter[1] = 0;
1054 netdev_for_each_mc_addr(ha, dev) {
1055 bitnr = greth_hash_get_index(ha->addr);
1056 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
1059 GRETH_REGSAVE(regs->hash_msb, mc_filter[1]);
1060 GRETH_REGSAVE(regs->hash_lsb, mc_filter[0]);
1063 static void greth_set_multicast_list(struct net_device *dev)
1066 struct greth_private *greth = netdev_priv(dev);
1067 struct greth_regs *regs = greth->regs;
1069 cfg = GRETH_REGLOAD(regs->control);
1070 if (dev->flags & IFF_PROMISC)
1071 cfg |= GRETH_CTRL_PR;
1073 cfg &= ~GRETH_CTRL_PR;
1075 if (greth->multicast) {
1076 if (dev->flags & IFF_ALLMULTI) {
1077 GRETH_REGSAVE(regs->hash_msb, -1);
1078 GRETH_REGSAVE(regs->hash_lsb, -1);
1079 cfg |= GRETH_CTRL_MCEN;
1080 GRETH_REGSAVE(regs->control, cfg);
1084 if (netdev_mc_empty(dev)) {
1085 cfg &= ~GRETH_CTRL_MCEN;
1086 GRETH_REGSAVE(regs->control, cfg);
1090 /* Setup multicast filter */
1091 greth_set_hash_filter(dev);
1092 cfg |= GRETH_CTRL_MCEN;
1094 GRETH_REGSAVE(regs->control, cfg);
1097 static u32 greth_get_msglevel(struct net_device *dev)
1099 struct greth_private *greth = netdev_priv(dev);
1100 return greth->msg_enable;
1103 static void greth_set_msglevel(struct net_device *dev, u32 value)
1105 struct greth_private *greth = netdev_priv(dev);
1106 greth->msg_enable = value;
1108 static int greth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1110 struct greth_private *greth = netdev_priv(dev);
1111 struct phy_device *phy = greth->phy;
1116 return phy_ethtool_gset(phy, cmd);
1119 static int greth_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1121 struct greth_private *greth = netdev_priv(dev);
1122 struct phy_device *phy = greth->phy;
1127 return phy_ethtool_sset(phy, cmd);
1130 static int greth_get_regs_len(struct net_device *dev)
1132 return sizeof(struct greth_regs);
1135 static void greth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1137 struct greth_private *greth = netdev_priv(dev);
1139 strlcpy(info->driver, dev_driver_string(greth->dev),
1140 sizeof(info->driver));
1141 strlcpy(info->version, "revision: 1.0", sizeof(info->version));
1142 strlcpy(info->bus_info, greth->dev->bus->name, sizeof(info->bus_info));
1143 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version));
1144 info->eedump_len = 0;
1145 info->regdump_len = sizeof(struct greth_regs);
1148 static void greth_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *p)
1151 struct greth_private *greth = netdev_priv(dev);
1152 u32 __iomem *greth_regs = (u32 __iomem *) greth->regs;
1155 for (i = 0; i < sizeof(struct greth_regs) / sizeof(u32); i++)
1156 buff[i] = greth_read_bd(&greth_regs[i]);
1159 static const struct ethtool_ops greth_ethtool_ops = {
1160 .get_msglevel = greth_get_msglevel,
1161 .set_msglevel = greth_set_msglevel,
1162 .get_settings = greth_get_settings,
1163 .set_settings = greth_set_settings,
1164 .get_drvinfo = greth_get_drvinfo,
1165 .get_regs_len = greth_get_regs_len,
1166 .get_regs = greth_get_regs,
1167 .get_link = ethtool_op_get_link,
1170 static struct net_device_ops greth_netdev_ops = {
1171 .ndo_open = greth_open,
1172 .ndo_stop = greth_close,
1173 .ndo_start_xmit = greth_start_xmit,
1174 .ndo_set_mac_address = greth_set_mac_add,
1175 .ndo_validate_addr = eth_validate_addr,
1178 static inline int wait_for_mdio(struct greth_private *greth)
1180 unsigned long timeout = jiffies + 4*HZ/100;
1181 while (GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_BUSY) {
1182 if (time_after(jiffies, timeout))
1188 static int greth_mdio_read(struct mii_bus *bus, int phy, int reg)
1190 struct greth_private *greth = bus->priv;
1193 if (!wait_for_mdio(greth))
1196 GRETH_REGSAVE(greth->regs->mdio, ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 2);
1198 if (!wait_for_mdio(greth))
1201 if (!(GRETH_REGLOAD(greth->regs->mdio) & GRETH_MII_NVALID)) {
1202 data = (GRETH_REGLOAD(greth->regs->mdio) >> 16) & 0xFFFF;
1210 static int greth_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
1212 struct greth_private *greth = bus->priv;
1214 if (!wait_for_mdio(greth))
1217 GRETH_REGSAVE(greth->regs->mdio,
1218 ((val & 0xFFFF) << 16) | ((phy & 0x1F) << 11) | ((reg & 0x1F) << 6) | 1);
1220 if (!wait_for_mdio(greth))
1226 static void greth_link_change(struct net_device *dev)
1228 struct greth_private *greth = netdev_priv(dev);
1229 struct phy_device *phydev = greth->phy;
1230 unsigned long flags;
1231 int status_change = 0;
1234 spin_lock_irqsave(&greth->devlock, flags);
1238 if ((greth->speed != phydev->speed) || (greth->duplex != phydev->duplex)) {
1239 ctrl = GRETH_REGLOAD(greth->regs->control) &
1240 ~(GRETH_CTRL_FD | GRETH_CTRL_SP | GRETH_CTRL_GB);
1243 ctrl |= GRETH_CTRL_FD;
1245 if (phydev->speed == SPEED_100)
1246 ctrl |= GRETH_CTRL_SP;
1247 else if (phydev->speed == SPEED_1000)
1248 ctrl |= GRETH_CTRL_GB;
1250 GRETH_REGSAVE(greth->regs->control, ctrl);
1251 greth->speed = phydev->speed;
1252 greth->duplex = phydev->duplex;
1257 if (phydev->link != greth->link) {
1258 if (!phydev->link) {
1262 greth->link = phydev->link;
1267 spin_unlock_irqrestore(&greth->devlock, flags);
1269 if (status_change) {
1271 pr_debug("%s: link up (%d/%s)\n",
1272 dev->name, phydev->speed,
1273 DUPLEX_FULL == phydev->duplex ? "Full" : "Half");
1275 pr_debug("%s: link down\n", dev->name);
1279 static int greth_mdio_probe(struct net_device *dev)
1281 struct greth_private *greth = netdev_priv(dev);
1282 struct phy_device *phy = NULL;
1285 /* Find the first PHY */
1286 phy = phy_find_first(greth->mdio);
1289 if (netif_msg_probe(greth))
1290 dev_err(&dev->dev, "no PHY found\n");
1294 ret = phy_connect_direct(dev, phy, &greth_link_change,
1295 greth->gbit_mac ? PHY_INTERFACE_MODE_GMII : PHY_INTERFACE_MODE_MII);
1297 if (netif_msg_ifup(greth))
1298 dev_err(&dev->dev, "could not attach to PHY\n");
1302 if (greth->gbit_mac)
1303 phy->supported &= PHY_GBIT_FEATURES;
1305 phy->supported &= PHY_BASIC_FEATURES;
1307 phy->advertising = phy->supported;
1317 static inline int phy_aneg_done(struct phy_device *phydev)
1321 retval = phy_read(phydev, MII_BMSR);
1323 return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
1326 static int greth_mdio_init(struct greth_private *greth)
1329 unsigned long timeout;
1331 greth->mdio = mdiobus_alloc();
1336 greth->mdio->name = "greth-mdio";
1337 snprintf(greth->mdio->id, MII_BUS_ID_SIZE, "%s-%d", greth->mdio->name, greth->irq);
1338 greth->mdio->read = greth_mdio_read;
1339 greth->mdio->write = greth_mdio_write;
1340 greth->mdio->priv = greth;
1342 greth->mdio->irq = greth->mdio_irqs;
1344 for (phy = 0; phy < PHY_MAX_ADDR; phy++)
1345 greth->mdio->irq[phy] = PHY_POLL;
1347 ret = mdiobus_register(greth->mdio);
1352 ret = greth_mdio_probe(greth->netdev);
1354 if (netif_msg_probe(greth))
1355 dev_err(&greth->netdev->dev, "failed to probe MDIO bus\n");
1359 phy_start(greth->phy);
1361 /* If Ethernet debug link is used make autoneg happen right away */
1362 if (greth->edcl && greth_edcl == 1) {
1363 phy_start_aneg(greth->phy);
1364 timeout = jiffies + 6*HZ;
1365 while (!phy_aneg_done(greth->phy) && time_before(jiffies, timeout)) {
1367 phy_read_status(greth->phy);
1368 greth_link_change(greth->netdev);
1374 mdiobus_unregister(greth->mdio);
1376 mdiobus_free(greth->mdio);
1380 /* Initialize the GRETH MAC */
1381 static int greth_of_probe(struct platform_device *ofdev)
1383 struct net_device *dev;
1384 struct greth_private *greth;
1385 struct greth_regs *regs;
1390 unsigned long timeout;
1392 dev = alloc_etherdev(sizeof(struct greth_private));
1397 greth = netdev_priv(dev);
1398 greth->netdev = dev;
1399 greth->dev = &ofdev->dev;
1401 if (greth_debug > 0)
1402 greth->msg_enable = greth_debug;
1404 greth->msg_enable = GRETH_DEF_MSG_ENABLE;
1406 spin_lock_init(&greth->devlock);
1408 greth->regs = of_ioremap(&ofdev->resource[0], 0,
1409 resource_size(&ofdev->resource[0]),
1410 "grlib-greth regs");
1412 if (greth->regs == NULL) {
1413 if (netif_msg_probe(greth))
1414 dev_err(greth->dev, "ioremap failure.\n");
1420 greth->irq = ofdev->archdata.irqs[0];
1422 dev_set_drvdata(greth->dev, dev);
1423 SET_NETDEV_DEV(dev, greth->dev);
1425 if (netif_msg_probe(greth))
1426 dev_dbg(greth->dev, "resetting controller.\n");
1428 /* Reset the controller. */
1429 GRETH_REGSAVE(regs->control, GRETH_RESET);
1431 /* Wait for MAC to reset itself */
1432 timeout = jiffies + HZ/100;
1433 while (GRETH_REGLOAD(regs->control) & GRETH_RESET) {
1434 if (time_after(jiffies, timeout)) {
1436 if (netif_msg_probe(greth))
1437 dev_err(greth->dev, "timeout when waiting for reset.\n");
1442 /* Get default PHY address */
1443 greth->phyaddr = (GRETH_REGLOAD(regs->mdio) >> 11) & 0x1F;
1445 /* Check if we have GBIT capable MAC */
1446 tmp = GRETH_REGLOAD(regs->control);
1447 greth->gbit_mac = (tmp >> 27) & 1;
1449 /* Check for multicast capability */
1450 greth->multicast = (tmp >> 25) & 1;
1452 greth->edcl = (tmp >> 31) & 1;
1454 /* If we have EDCL we disable the EDCL speed-duplex FSM so
1455 * it doesn't interfere with the software */
1456 if (greth->edcl != 0)
1457 GRETH_REGORIN(regs->control, GRETH_CTRL_DISDUPLEX);
1459 /* Check if MAC can handle MDIO interrupts */
1460 greth->mdio_int_en = (tmp >> 26) & 1;
1462 err = greth_mdio_init(greth);
1464 if (netif_msg_probe(greth))
1465 dev_err(greth->dev, "failed to register MDIO bus\n");
1469 /* Allocate TX descriptor ring in coherent memory */
1470 greth->tx_bd_base = dma_zalloc_coherent(greth->dev, 1024,
1471 &greth->tx_bd_base_phys,
1473 if (!greth->tx_bd_base) {
1478 /* Allocate RX descriptor ring in coherent memory */
1479 greth->rx_bd_base = dma_zalloc_coherent(greth->dev, 1024,
1480 &greth->rx_bd_base_phys,
1482 if (!greth->rx_bd_base) {
1487 /* Get MAC address from: module param, OF property or ID prom */
1488 for (i = 0; i < 6; i++) {
1489 if (macaddr[i] != 0)
1493 const unsigned char *addr;
1495 addr = of_get_property(ofdev->dev.of_node, "local-mac-address",
1497 if (addr != NULL && len == 6) {
1498 for (i = 0; i < 6; i++)
1499 macaddr[i] = (unsigned int) addr[i];
1502 for (i = 0; i < 6; i++)
1503 macaddr[i] = (unsigned int) idprom->id_ethaddr[i];
1508 for (i = 0; i < 6; i++)
1509 dev->dev_addr[i] = macaddr[i];
1513 if (!is_valid_ether_addr(&dev->dev_addr[0])) {
1514 if (netif_msg_probe(greth))
1515 dev_err(greth->dev, "no valid ethernet address, aborting.\n");
1520 GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
1521 GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
1522 dev->dev_addr[4] << 8 | dev->dev_addr[5]);
1524 /* Clear all pending interrupts except PHY irq */
1525 GRETH_REGSAVE(regs->status, 0xFF);
1527 if (greth->gbit_mac) {
1528 dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM |
1530 dev->features = dev->hw_features | NETIF_F_HIGHDMA;
1531 greth_netdev_ops.ndo_start_xmit = greth_start_xmit_gbit;
1534 if (greth->multicast) {
1535 greth_netdev_ops.ndo_set_rx_mode = greth_set_multicast_list;
1536 dev->flags |= IFF_MULTICAST;
1538 dev->flags &= ~IFF_MULTICAST;
1541 dev->netdev_ops = &greth_netdev_ops;
1542 dev->ethtool_ops = &greth_ethtool_ops;
1544 err = register_netdev(dev);
1546 if (netif_msg_probe(greth))
1547 dev_err(greth->dev, "netdevice registration failed.\n");
1552 netif_napi_add(dev, &greth->napi, greth_poll, 64);
1557 dma_free_coherent(greth->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1559 dma_free_coherent(greth->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1561 mdiobus_unregister(greth->mdio);
1563 of_iounmap(&ofdev->resource[0], greth->regs, resource_size(&ofdev->resource[0]));
1569 static int greth_of_remove(struct platform_device *of_dev)
1571 struct net_device *ndev = platform_get_drvdata(of_dev);
1572 struct greth_private *greth = netdev_priv(ndev);
1574 /* Free descriptor areas */
1575 dma_free_coherent(&of_dev->dev, 1024, greth->rx_bd_base, greth->rx_bd_base_phys);
1577 dma_free_coherent(&of_dev->dev, 1024, greth->tx_bd_base, greth->tx_bd_base_phys);
1580 phy_stop(greth->phy);
1581 mdiobus_unregister(greth->mdio);
1583 unregister_netdev(ndev);
1586 of_iounmap(&of_dev->resource[0], greth->regs, resource_size(&of_dev->resource[0]));
1591 static const struct of_device_id greth_of_match[] = {
1593 .name = "GAISLER_ETHMAC",
1601 MODULE_DEVICE_TABLE(of, greth_of_match);
1603 static struct platform_driver greth_of_driver = {
1605 .name = "grlib-greth",
1606 .of_match_table = greth_of_match,
1608 .probe = greth_of_probe,
1609 .remove = greth_of_remove,
1612 module_platform_driver(greth_of_driver);
1614 MODULE_AUTHOR("Aeroflex Gaisler AB.");
1615 MODULE_DESCRIPTION("Aeroflex Gaisler Ethernet MAC driver");
1616 MODULE_LICENSE("GPL");