2 * Atmel MACB Ethernet Controller driver
4 * Copyright (C) 2004-2006 Atmel Corporation
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/clk.h>
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/kernel.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/init.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/platform_device.h>
22 #include <linux/phy.h>
24 #include <asm/arch/board.h>
25 #include <asm/arch/cpu.h>
29 #define RX_BUFFER_SIZE 128
30 #define RX_RING_SIZE 512
31 #define RX_RING_BYTES (sizeof(struct dma_desc) * RX_RING_SIZE)
33 /* Make the IP header word-aligned (the ethernet header is 14 bytes) */
36 #define TX_RING_SIZE 128
37 #define DEF_TX_RING_PENDING (TX_RING_SIZE - 1)
38 #define TX_RING_BYTES (sizeof(struct dma_desc) * TX_RING_SIZE)
40 #define TX_RING_GAP(bp) \
41 (TX_RING_SIZE - (bp)->tx_pending)
42 #define TX_BUFFS_AVAIL(bp) \
43 (((bp)->tx_tail <= (bp)->tx_head) ? \
44 (bp)->tx_tail + (bp)->tx_pending - (bp)->tx_head : \
45 (bp)->tx_tail - (bp)->tx_head - TX_RING_GAP(bp))
46 #define NEXT_TX(n) (((n) + 1) & (TX_RING_SIZE - 1))
48 #define NEXT_RX(n) (((n) + 1) & (RX_RING_SIZE - 1))
50 /* minimum number of free TX descriptors before waking up TX process */
51 #define MACB_TX_WAKEUP_THRESH (TX_RING_SIZE / 4)
53 #define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \
56 static void __macb_set_hwaddr(struct macb *bp)
61 bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
62 macb_writel(bp, SA1B, bottom);
63 top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
64 macb_writel(bp, SA1T, top);
67 static void __init macb_get_hwaddr(struct macb *bp)
73 bottom = macb_readl(bp, SA1B);
74 top = macb_readl(bp, SA1T);
76 addr[0] = bottom & 0xff;
77 addr[1] = (bottom >> 8) & 0xff;
78 addr[2] = (bottom >> 16) & 0xff;
79 addr[3] = (bottom >> 24) & 0xff;
81 addr[5] = (top >> 8) & 0xff;
83 if (is_valid_ether_addr(addr))
84 memcpy(bp->dev->dev_addr, addr, sizeof(addr));
87 static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
89 struct macb *bp = bus->priv;
92 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
93 | MACB_BF(RW, MACB_MAN_READ)
94 | MACB_BF(PHYA, mii_id)
95 | MACB_BF(REGA, regnum)
96 | MACB_BF(CODE, MACB_MAN_CODE)));
98 /* wait for end of transfer */
99 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
102 value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
107 static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
110 struct macb *bp = bus->priv;
112 macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
113 | MACB_BF(RW, MACB_MAN_WRITE)
114 | MACB_BF(PHYA, mii_id)
115 | MACB_BF(REGA, regnum)
116 | MACB_BF(CODE, MACB_MAN_CODE)
117 | MACB_BF(DATA, value)));
119 /* wait for end of transfer */
120 while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
126 static int macb_mdio_reset(struct mii_bus *bus)
131 static void macb_handle_link_change(struct net_device *dev)
133 struct macb *bp = netdev_priv(dev);
134 struct phy_device *phydev = bp->phy_dev;
137 int status_change = 0;
139 spin_lock_irqsave(&bp->lock, flags);
142 if ((bp->speed != phydev->speed) ||
143 (bp->duplex != phydev->duplex)) {
146 reg = macb_readl(bp, NCFGR);
147 reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
151 if (phydev->speed == SPEED_100)
152 reg |= MACB_BIT(SPD);
154 macb_writel(bp, NCFGR, reg);
156 bp->speed = phydev->speed;
157 bp->duplex = phydev->duplex;
162 if (phydev->link != bp->link) {
169 bp->link = phydev->link;
174 spin_unlock_irqrestore(&bp->lock, flags);
178 printk(KERN_INFO "%s: link up (%d/%s)\n",
179 dev->name, phydev->speed,
180 DUPLEX_FULL == phydev->duplex ? "Full":"Half");
182 printk(KERN_INFO "%s: link down\n", dev->name);
186 /* based on au1000_eth. c*/
187 static int macb_mii_probe(struct net_device *dev)
189 struct macb *bp = netdev_priv(dev);
190 struct phy_device *phydev = NULL;
191 struct eth_platform_data *pdata;
194 /* find the first phy */
195 for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
196 if (bp->mii_bus.phy_map[phy_addr]) {
197 phydev = bp->mii_bus.phy_map[phy_addr];
203 printk (KERN_ERR "%s: no PHY found\n", dev->name);
207 pdata = bp->pdev->dev.platform_data;
208 /* TODO : add pin_irq */
210 /* attach the mac to the phy */
211 if (pdata && pdata->is_rmii) {
212 phydev = phy_connect(dev, phydev->dev.bus_id,
213 &macb_handle_link_change, 0, PHY_INTERFACE_MODE_RMII);
215 phydev = phy_connect(dev, phydev->dev.bus_id,
216 &macb_handle_link_change, 0, PHY_INTERFACE_MODE_MII);
219 if (IS_ERR(phydev)) {
220 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
221 return PTR_ERR(phydev);
224 /* mask with MAC supported features */
225 phydev->supported &= PHY_BASIC_FEATURES;
227 phydev->advertising = phydev->supported;
232 bp->phy_dev = phydev;
237 static int macb_mii_init(struct macb *bp)
239 struct eth_platform_data *pdata;
242 /* Enable managment port */
243 macb_writel(bp, NCR, MACB_BIT(MPE));
245 bp->mii_bus.name = "MACB_mii_bus";
246 bp->mii_bus.read = &macb_mdio_read;
247 bp->mii_bus.write = &macb_mdio_write;
248 bp->mii_bus.reset = &macb_mdio_reset;
249 snprintf(bp->mii_bus.id, MII_BUS_ID_SIZE, "%x", bp->pdev->id);
250 bp->mii_bus.priv = bp;
251 bp->mii_bus.dev = &bp->dev->dev;
252 pdata = bp->pdev->dev.platform_data;
255 bp->mii_bus.phy_mask = pdata->phy_mask;
257 bp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
258 if (!bp->mii_bus.irq) {
263 for (i = 0; i < PHY_MAX_ADDR; i++)
264 bp->mii_bus.irq[i] = PHY_POLL;
266 platform_set_drvdata(bp->dev, &bp->mii_bus);
268 if (mdiobus_register(&bp->mii_bus))
269 goto err_out_free_mdio_irq;
271 if (macb_mii_probe(bp->dev) != 0) {
272 goto err_out_unregister_bus;
277 err_out_unregister_bus:
278 mdiobus_unregister(&bp->mii_bus);
279 err_out_free_mdio_irq:
280 kfree(bp->mii_bus.irq);
285 static void macb_update_stats(struct macb *bp)
287 u32 __iomem *reg = bp->regs + MACB_PFR;
288 u32 *p = &bp->hw_stats.rx_pause_frames;
289 u32 *end = &bp->hw_stats.tx_pause_frames + 1;
291 WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
293 for(; p < end; p++, reg++)
294 *p += __raw_readl(reg);
297 static void macb_tx(struct macb *bp)
303 status = macb_readl(bp, TSR);
304 macb_writel(bp, TSR, status);
306 dev_dbg(&bp->pdev->dev, "macb_tx status = %02lx\n",
307 (unsigned long)status);
309 if (status & MACB_BIT(UND)) {
311 printk(KERN_ERR "%s: TX underrun, resetting buffers\n",
316 /*Mark all the buffer as used to avoid sending a lost buffer*/
317 for (i = 0; i < TX_RING_SIZE; i++)
318 bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
320 /* free transmit buffer in upper layer*/
321 for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
322 struct ring_info *rp = &bp->tx_skb[tail];
323 struct sk_buff *skb = rp->skb;
329 dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
332 dev_kfree_skb_irq(skb);
335 bp->tx_head = bp->tx_tail = 0;
338 if (!(status & MACB_BIT(COMP)))
340 * This may happen when a buffer becomes complete
341 * between reading the ISR and scanning the
342 * descriptors. Nothing to worry about.
347 for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
348 struct ring_info *rp = &bp->tx_skb[tail];
349 struct sk_buff *skb = rp->skb;
355 bufstat = bp->tx_ring[tail].ctrl;
357 if (!(bufstat & MACB_BIT(TX_USED)))
360 dev_dbg(&bp->pdev->dev, "skb %u (data %p) TX complete\n",
362 dma_unmap_single(&bp->pdev->dev, rp->mapping, skb->len,
364 bp->stats.tx_packets++;
365 bp->stats.tx_bytes += skb->len;
367 dev_kfree_skb_irq(skb);
371 if (netif_queue_stopped(bp->dev) &&
372 TX_BUFFS_AVAIL(bp) > MACB_TX_WAKEUP_THRESH)
373 netif_wake_queue(bp->dev);
376 static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
377 unsigned int last_frag)
381 unsigned int offset = 0;
384 len = MACB_BFEXT(RX_FRMLEN, bp->rx_ring[last_frag].ctrl);
386 dev_dbg(&bp->pdev->dev, "macb_rx_frame frags %u - %u (len %u)\n",
387 first_frag, last_frag, len);
389 skb = dev_alloc_skb(len + RX_OFFSET);
391 bp->stats.rx_dropped++;
392 for (frag = first_frag; ; frag = NEXT_RX(frag)) {
393 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
394 if (frag == last_frag)
401 skb_reserve(skb, RX_OFFSET);
402 skb->ip_summed = CHECKSUM_NONE;
405 for (frag = first_frag; ; frag = NEXT_RX(frag)) {
406 unsigned int frag_len = RX_BUFFER_SIZE;
408 if (offset + frag_len > len) {
409 BUG_ON(frag != last_frag);
410 frag_len = len - offset;
412 skb_copy_to_linear_data_offset(skb, offset,
414 (RX_BUFFER_SIZE * frag)),
416 offset += RX_BUFFER_SIZE;
417 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
420 if (frag == last_frag)
424 skb->protocol = eth_type_trans(skb, bp->dev);
426 bp->stats.rx_packets++;
427 bp->stats.rx_bytes += len;
428 bp->dev->last_rx = jiffies;
429 dev_dbg(&bp->pdev->dev, "received skb of length %u, csum: %08x\n",
430 skb->len, skb->csum);
431 netif_receive_skb(skb);
436 /* Mark DMA descriptors from begin up to and not including end as unused */
437 static void discard_partial_frame(struct macb *bp, unsigned int begin,
442 for (frag = begin; frag != end; frag = NEXT_RX(frag))
443 bp->rx_ring[frag].addr &= ~MACB_BIT(RX_USED);
447 * When this happens, the hardware stats registers for
448 * whatever caused this is updated, so we don't have to record
453 static int macb_rx(struct macb *bp, int budget)
456 unsigned int tail = bp->rx_tail;
459 for (; budget > 0; tail = NEXT_RX(tail)) {
463 addr = bp->rx_ring[tail].addr;
464 ctrl = bp->rx_ring[tail].ctrl;
466 if (!(addr & MACB_BIT(RX_USED)))
469 if (ctrl & MACB_BIT(RX_SOF)) {
470 if (first_frag != -1)
471 discard_partial_frame(bp, first_frag, tail);
475 if (ctrl & MACB_BIT(RX_EOF)) {
477 BUG_ON(first_frag == -1);
479 dropped = macb_rx_frame(bp, first_frag, tail);
488 if (first_frag != -1)
489 bp->rx_tail = first_frag;
496 static int macb_poll(struct napi_struct *napi, int budget)
498 struct macb *bp = container_of(napi, struct macb, napi);
499 struct net_device *dev = bp->dev;
503 status = macb_readl(bp, RSR);
504 macb_writel(bp, RSR, status);
509 * This may happen if an interrupt was pending before
510 * this function was called last time, and no packets
511 * have been received since.
513 netif_rx_complete(dev, napi);
517 dev_dbg(&bp->pdev->dev, "poll: status = %08lx, budget = %d\n",
518 (unsigned long)status, budget);
520 if (!(status & MACB_BIT(REC))) {
521 dev_warn(&bp->pdev->dev,
522 "No RX buffers complete, status = %02lx\n",
523 (unsigned long)status);
524 netif_rx_complete(dev, napi);
528 work_done = macb_rx(bp, budget);
529 if (work_done < budget)
530 netif_rx_complete(dev, napi);
533 * We've done what we can to clean the buffers. Make sure we
534 * get notified when new packets arrive.
537 macb_writel(bp, IER, MACB_RX_INT_FLAGS);
539 /* TODO: Handle errors */
544 static irqreturn_t macb_interrupt(int irq, void *dev_id)
546 struct net_device *dev = dev_id;
547 struct macb *bp = netdev_priv(dev);
550 status = macb_readl(bp, ISR);
552 if (unlikely(!status))
555 spin_lock(&bp->lock);
558 /* close possible race with dev_close */
559 if (unlikely(!netif_running(dev))) {
560 macb_writel(bp, IDR, ~0UL);
564 if (status & MACB_RX_INT_FLAGS) {
565 if (netif_rx_schedule_prep(dev, &bp->napi)) {
567 * There's no point taking any more interrupts
568 * until we have processed the buffers
570 macb_writel(bp, IDR, MACB_RX_INT_FLAGS);
571 dev_dbg(&bp->pdev->dev,
572 "scheduling RX softirq\n");
573 __netif_rx_schedule(dev, &bp->napi);
577 if (status & (MACB_BIT(TCOMP) | MACB_BIT(ISR_TUND)))
581 * Link change detection isn't possible with RMII, so we'll
582 * add that if/when we get our hands on a full-blown MII PHY.
585 if (status & MACB_BIT(HRESP)) {
587 * TODO: Reset the hardware, and maybe move the printk
588 * to a lower-priority context as well (work queue?)
590 printk(KERN_ERR "%s: DMA bus error: HRESP not OK\n",
594 status = macb_readl(bp, ISR);
597 spin_unlock(&bp->lock);
602 static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
604 struct macb *bp = netdev_priv(dev);
606 unsigned int len, entry;
611 dev_dbg(&bp->pdev->dev,
612 "start_xmit: len %u head %p data %p tail %p end %p\n",
613 skb->len, skb->head, skb->data,
614 skb_tail_pointer(skb), skb_end_pointer(skb));
615 dev_dbg(&bp->pdev->dev,
617 for (i = 0; i < 16; i++)
618 printk(" %02x", (unsigned int)skb->data[i]);
623 spin_lock_irq(&bp->lock);
625 /* This is a hard error, log it. */
626 if (TX_BUFFS_AVAIL(bp) < 1) {
627 netif_stop_queue(dev);
628 spin_unlock_irq(&bp->lock);
629 dev_err(&bp->pdev->dev,
630 "BUG! Tx Ring full when queue awake!\n");
631 dev_dbg(&bp->pdev->dev, "tx_head = %u, tx_tail = %u\n",
632 bp->tx_head, bp->tx_tail);
637 dev_dbg(&bp->pdev->dev, "Allocated ring entry %u\n", entry);
638 mapping = dma_map_single(&bp->pdev->dev, skb->data,
640 bp->tx_skb[entry].skb = skb;
641 bp->tx_skb[entry].mapping = mapping;
642 dev_dbg(&bp->pdev->dev, "Mapped skb data %p to DMA addr %08lx\n",
643 skb->data, (unsigned long)mapping);
645 ctrl = MACB_BF(TX_FRMLEN, len);
646 ctrl |= MACB_BIT(TX_LAST);
647 if (entry == (TX_RING_SIZE - 1))
648 ctrl |= MACB_BIT(TX_WRAP);
650 bp->tx_ring[entry].addr = mapping;
651 bp->tx_ring[entry].ctrl = ctrl;
654 entry = NEXT_TX(entry);
657 macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
659 if (TX_BUFFS_AVAIL(bp) < 1)
660 netif_stop_queue(dev);
662 spin_unlock_irq(&bp->lock);
664 dev->trans_start = jiffies;
669 static void macb_free_consistent(struct macb *bp)
676 dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES,
677 bp->rx_ring, bp->rx_ring_dma);
681 dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES,
682 bp->tx_ring, bp->tx_ring_dma);
685 if (bp->rx_buffers) {
686 dma_free_coherent(&bp->pdev->dev,
687 RX_RING_SIZE * RX_BUFFER_SIZE,
688 bp->rx_buffers, bp->rx_buffers_dma);
689 bp->rx_buffers = NULL;
693 static int macb_alloc_consistent(struct macb *bp)
697 size = TX_RING_SIZE * sizeof(struct ring_info);
698 bp->tx_skb = kmalloc(size, GFP_KERNEL);
702 size = RX_RING_BYTES;
703 bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
704 &bp->rx_ring_dma, GFP_KERNEL);
707 dev_dbg(&bp->pdev->dev,
708 "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
709 size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
711 size = TX_RING_BYTES;
712 bp->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
713 &bp->tx_ring_dma, GFP_KERNEL);
716 dev_dbg(&bp->pdev->dev,
717 "Allocated TX ring of %d bytes at %08lx (mapped %p)\n",
718 size, (unsigned long)bp->tx_ring_dma, bp->tx_ring);
720 size = RX_RING_SIZE * RX_BUFFER_SIZE;
721 bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
722 &bp->rx_buffers_dma, GFP_KERNEL);
725 dev_dbg(&bp->pdev->dev,
726 "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
727 size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
732 macb_free_consistent(bp);
736 static void macb_init_rings(struct macb *bp)
741 addr = bp->rx_buffers_dma;
742 for (i = 0; i < RX_RING_SIZE; i++) {
743 bp->rx_ring[i].addr = addr;
744 bp->rx_ring[i].ctrl = 0;
745 addr += RX_BUFFER_SIZE;
747 bp->rx_ring[RX_RING_SIZE - 1].addr |= MACB_BIT(RX_WRAP);
749 for (i = 0; i < TX_RING_SIZE; i++) {
750 bp->tx_ring[i].addr = 0;
751 bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
753 bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
755 bp->rx_tail = bp->tx_head = bp->tx_tail = 0;
758 static void macb_reset_hw(struct macb *bp)
760 /* Make sure we have the write buffer for ourselves */
764 * Disable RX and TX (XXX: Should we halt the transmission
767 macb_writel(bp, NCR, 0);
769 /* Clear the stats registers (XXX: Update stats first?) */
770 macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
772 /* Clear all status flags */
773 macb_writel(bp, TSR, ~0UL);
774 macb_writel(bp, RSR, ~0UL);
776 /* Disable all interrupts */
777 macb_writel(bp, IDR, ~0UL);
781 static void macb_init_hw(struct macb *bp)
786 __macb_set_hwaddr(bp);
788 config = macb_readl(bp, NCFGR) & MACB_BF(CLK, -1L);
789 config |= MACB_BIT(PAE); /* PAuse Enable */
790 config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
791 if (bp->dev->flags & IFF_PROMISC)
792 config |= MACB_BIT(CAF); /* Copy All Frames */
793 if (!(bp->dev->flags & IFF_BROADCAST))
794 config |= MACB_BIT(NBC); /* No BroadCast */
795 macb_writel(bp, NCFGR, config);
797 /* Initialize TX and RX buffers */
798 macb_writel(bp, RBQP, bp->rx_ring_dma);
799 macb_writel(bp, TBQP, bp->tx_ring_dma);
801 /* Enable TX and RX */
802 macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
804 /* Enable interrupts */
805 macb_writel(bp, IER, (MACB_BIT(RCOMP)
817 * The hash address register is 64 bits long and takes up two
818 * locations in the memory map. The least significant bits are stored
819 * in EMAC_HSL and the most significant bits in EMAC_HSH.
821 * The unicast hash enable and the multicast hash enable bits in the
822 * network configuration register enable the reception of hash matched
823 * frames. The destination address is reduced to a 6 bit index into
824 * the 64 bit hash register using the following hash function. The
825 * hash function is an exclusive or of every sixth bit of the
826 * destination address.
828 * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
829 * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
830 * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
831 * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
832 * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
833 * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
835 * da[0] represents the least significant bit of the first byte
836 * received, that is, the multicast/unicast indicator, and da[47]
837 * represents the most significant bit of the last byte received. If
838 * the hash index, hi[n], points to a bit that is set in the hash
839 * register then the frame will be matched according to whether the
840 * frame is multicast or unicast. A multicast match will be signalled
841 * if the multicast hash enable bit is set, da[0] is 1 and the hash
842 * index points to a bit set in the hash register. A unicast match
843 * will be signalled if the unicast hash enable bit is set, da[0] is 0
844 * and the hash index points to a bit set in the hash register. To
845 * receive all multicast frames, the hash register should be set with
846 * all ones and the multicast hash enable bit should be set in the
847 * network configuration register.
850 static inline int hash_bit_value(int bitnr, __u8 *addr)
852 if (addr[bitnr / 8] & (1 << (bitnr % 8)))
858 * Return the hash index value for the specified address.
860 static int hash_get_index(__u8 *addr)
865 for (j = 0; j < 6; j++) {
866 for (i = 0, bitval = 0; i < 8; i++)
867 bitval ^= hash_bit_value(i*6 + j, addr);
869 hash_index |= (bitval << j);
876 * Add multicast addresses to the internal multicast-hash table.
878 static void macb_sethashtable(struct net_device *dev)
880 struct dev_mc_list *curr;
881 unsigned long mc_filter[2];
882 unsigned int i, bitnr;
883 struct macb *bp = netdev_priv(dev);
885 mc_filter[0] = mc_filter[1] = 0;
888 for (i = 0; i < dev->mc_count; i++, curr = curr->next) {
889 if (!curr) break; /* unexpected end of list */
891 bitnr = hash_get_index(curr->dmi_addr);
892 mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
895 macb_writel(bp, HRB, mc_filter[0]);
896 macb_writel(bp, HRT, mc_filter[1]);
900 * Enable/Disable promiscuous and multicast modes.
902 static void macb_set_rx_mode(struct net_device *dev)
905 struct macb *bp = netdev_priv(dev);
907 cfg = macb_readl(bp, NCFGR);
909 if (dev->flags & IFF_PROMISC)
910 /* Enable promiscuous mode */
911 cfg |= MACB_BIT(CAF);
912 else if (dev->flags & (~IFF_PROMISC))
913 /* Disable promiscuous mode */
914 cfg &= ~MACB_BIT(CAF);
916 if (dev->flags & IFF_ALLMULTI) {
917 /* Enable all multicast mode */
918 macb_writel(bp, HRB, -1);
919 macb_writel(bp, HRT, -1);
920 cfg |= MACB_BIT(NCFGR_MTI);
921 } else if (dev->mc_count > 0) {
922 /* Enable specific multicasts */
923 macb_sethashtable(dev);
924 cfg |= MACB_BIT(NCFGR_MTI);
925 } else if (dev->flags & (~IFF_ALLMULTI)) {
926 /* Disable all multicast mode */
927 macb_writel(bp, HRB, 0);
928 macb_writel(bp, HRT, 0);
929 cfg &= ~MACB_BIT(NCFGR_MTI);
932 macb_writel(bp, NCFGR, cfg);
935 static int macb_open(struct net_device *dev)
937 struct macb *bp = netdev_priv(dev);
940 dev_dbg(&bp->pdev->dev, "open\n");
942 /* if the phy is not yet register, retry later*/
946 if (!is_valid_ether_addr(dev->dev_addr))
947 return -EADDRNOTAVAIL;
949 err = macb_alloc_consistent(bp);
952 "%s: Unable to allocate DMA memory (error %d)\n",
957 napi_enable(&bp->napi);
962 /* schedule a link state check */
963 phy_start(bp->phy_dev);
965 netif_start_queue(dev);
970 static int macb_close(struct net_device *dev)
972 struct macb *bp = netdev_priv(dev);
975 netif_stop_queue(dev);
976 napi_disable(&bp->napi);
979 phy_stop(bp->phy_dev);
981 spin_lock_irqsave(&bp->lock, flags);
983 netif_carrier_off(dev);
984 spin_unlock_irqrestore(&bp->lock, flags);
986 macb_free_consistent(bp);
991 static struct net_device_stats *macb_get_stats(struct net_device *dev)
993 struct macb *bp = netdev_priv(dev);
994 struct net_device_stats *nstat = &bp->stats;
995 struct macb_stats *hwstat = &bp->hw_stats;
997 /* read stats from hardware */
998 macb_update_stats(bp);
1000 /* Convert HW stats into netdevice stats */
1001 nstat->rx_errors = (hwstat->rx_fcs_errors +
1002 hwstat->rx_align_errors +
1003 hwstat->rx_resource_errors +
1004 hwstat->rx_overruns +
1005 hwstat->rx_oversize_pkts +
1006 hwstat->rx_jabbers +
1007 hwstat->rx_undersize_pkts +
1008 hwstat->sqe_test_errors +
1009 hwstat->rx_length_mismatch);
1010 nstat->tx_errors = (hwstat->tx_late_cols +
1011 hwstat->tx_excessive_cols +
1012 hwstat->tx_underruns +
1013 hwstat->tx_carrier_errors);
1014 nstat->collisions = (hwstat->tx_single_cols +
1015 hwstat->tx_multiple_cols +
1016 hwstat->tx_excessive_cols);
1017 nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
1018 hwstat->rx_jabbers +
1019 hwstat->rx_undersize_pkts +
1020 hwstat->rx_length_mismatch);
1021 nstat->rx_over_errors = hwstat->rx_resource_errors;
1022 nstat->rx_crc_errors = hwstat->rx_fcs_errors;
1023 nstat->rx_frame_errors = hwstat->rx_align_errors;
1024 nstat->rx_fifo_errors = hwstat->rx_overruns;
1025 /* XXX: What does "missed" mean? */
1026 nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
1027 nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
1028 nstat->tx_fifo_errors = hwstat->tx_underruns;
1029 /* Don't know about heartbeat or window errors... */
1034 static int macb_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1036 struct macb *bp = netdev_priv(dev);
1037 struct phy_device *phydev = bp->phy_dev;
1042 return phy_ethtool_gset(phydev, cmd);
1045 static int macb_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
1047 struct macb *bp = netdev_priv(dev);
1048 struct phy_device *phydev = bp->phy_dev;
1053 return phy_ethtool_sset(phydev, cmd);
1056 static void macb_get_drvinfo(struct net_device *dev,
1057 struct ethtool_drvinfo *info)
1059 struct macb *bp = netdev_priv(dev);
1061 strcpy(info->driver, bp->pdev->dev.driver->name);
1062 strcpy(info->version, "$Revision: 1.14 $");
1063 strcpy(info->bus_info, bp->pdev->dev.bus_id);
1066 static struct ethtool_ops macb_ethtool_ops = {
1067 .get_settings = macb_get_settings,
1068 .set_settings = macb_set_settings,
1069 .get_drvinfo = macb_get_drvinfo,
1070 .get_link = ethtool_op_get_link,
1073 static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1075 struct macb *bp = netdev_priv(dev);
1076 struct phy_device *phydev = bp->phy_dev;
1078 if (!netif_running(dev))
1084 return phy_mii_ioctl(phydev, if_mii(rq), cmd);
1087 static int __init macb_probe(struct platform_device *pdev)
1089 struct eth_platform_data *pdata;
1090 struct resource *regs;
1091 struct net_device *dev;
1093 struct phy_device *phydev;
1094 unsigned long pclk_hz;
1097 DECLARE_MAC_BUF(mac);
1099 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1101 dev_err(&pdev->dev, "no mmio resource defined\n");
1106 dev = alloc_etherdev(sizeof(*bp));
1108 dev_err(&pdev->dev, "etherdev alloc failed, aborting.\n");
1112 SET_NETDEV_DEV(dev, &pdev->dev);
1114 /* TODO: Actually, we have some interesting features... */
1117 bp = netdev_priv(dev);
1121 spin_lock_init(&bp->lock);
1123 #if defined(CONFIG_ARCH_AT91)
1124 bp->pclk = clk_get(&pdev->dev, "macb_clk");
1125 if (IS_ERR(bp->pclk)) {
1126 dev_err(&pdev->dev, "failed to get macb_clk\n");
1127 goto err_out_free_dev;
1129 clk_enable(bp->pclk);
1131 bp->pclk = clk_get(&pdev->dev, "pclk");
1132 if (IS_ERR(bp->pclk)) {
1133 dev_err(&pdev->dev, "failed to get pclk\n");
1134 goto err_out_free_dev;
1136 bp->hclk = clk_get(&pdev->dev, "hclk");
1137 if (IS_ERR(bp->hclk)) {
1138 dev_err(&pdev->dev, "failed to get hclk\n");
1139 goto err_out_put_pclk;
1142 clk_enable(bp->pclk);
1143 clk_enable(bp->hclk);
1146 bp->regs = ioremap(regs->start, regs->end - regs->start + 1);
1148 dev_err(&pdev->dev, "failed to map registers, aborting.\n");
1150 goto err_out_disable_clocks;
1153 dev->irq = platform_get_irq(pdev, 0);
1154 err = request_irq(dev->irq, macb_interrupt, IRQF_SAMPLE_RANDOM,
1158 "%s: Unable to request IRQ %d (error %d)\n",
1159 dev->name, dev->irq, err);
1160 goto err_out_iounmap;
1163 dev->open = macb_open;
1164 dev->stop = macb_close;
1165 dev->hard_start_xmit = macb_start_xmit;
1166 dev->get_stats = macb_get_stats;
1167 dev->set_multicast_list = macb_set_rx_mode;
1168 dev->do_ioctl = macb_ioctl;
1169 netif_napi_add(dev, &bp->napi, macb_poll, 64);
1170 dev->ethtool_ops = &macb_ethtool_ops;
1172 dev->base_addr = regs->start;
1174 /* Set MII management clock divider */
1175 pclk_hz = clk_get_rate(bp->pclk);
1176 if (pclk_hz <= 20000000)
1177 config = MACB_BF(CLK, MACB_CLK_DIV8);
1178 else if (pclk_hz <= 40000000)
1179 config = MACB_BF(CLK, MACB_CLK_DIV16);
1180 else if (pclk_hz <= 80000000)
1181 config = MACB_BF(CLK, MACB_CLK_DIV32);
1183 config = MACB_BF(CLK, MACB_CLK_DIV64);
1184 macb_writel(bp, NCFGR, config);
1186 macb_get_hwaddr(bp);
1187 pdata = pdev->dev.platform_data;
1189 if (pdata && pdata->is_rmii)
1190 #if defined(CONFIG_ARCH_AT91)
1191 macb_writel(bp, USRIO, (MACB_BIT(RMII) | MACB_BIT(CLKEN)) );
1193 macb_writel(bp, USRIO, 0);
1196 #if defined(CONFIG_ARCH_AT91)
1197 macb_writel(bp, USRIO, MACB_BIT(CLKEN));
1199 macb_writel(bp, USRIO, MACB_BIT(MII));
1202 bp->tx_pending = DEF_TX_RING_PENDING;
1204 err = register_netdev(dev);
1206 dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
1207 goto err_out_free_irq;
1210 if (macb_mii_init(bp) != 0) {
1211 goto err_out_unregister_netdev;
1214 platform_set_drvdata(pdev, dev);
1216 printk(KERN_INFO "%s: Atmel MACB at 0x%08lx irq %d "
1218 dev->name, dev->base_addr, dev->irq,
1219 print_mac(mac, dev->dev_addr));
1221 phydev = bp->phy_dev;
1222 printk(KERN_INFO "%s: attached PHY driver [%s] "
1223 "(mii_bus:phy_addr=%s, irq=%d)\n",
1224 dev->name, phydev->drv->name, phydev->dev.bus_id, phydev->irq);
1228 err_out_unregister_netdev:
1229 unregister_netdev(dev);
1231 free_irq(dev->irq, dev);
1234 err_out_disable_clocks:
1235 #ifndef CONFIG_ARCH_AT91
1236 clk_disable(bp->hclk);
1239 clk_disable(bp->pclk);
1240 #ifndef CONFIG_ARCH_AT91
1247 platform_set_drvdata(pdev, NULL);
1251 static int __exit macb_remove(struct platform_device *pdev)
1253 struct net_device *dev;
1256 dev = platform_get_drvdata(pdev);
1259 bp = netdev_priv(dev);
1261 phy_disconnect(bp->phy_dev);
1262 mdiobus_unregister(&bp->mii_bus);
1263 kfree(bp->mii_bus.irq);
1264 unregister_netdev(dev);
1265 free_irq(dev->irq, dev);
1267 #ifndef CONFIG_ARCH_AT91
1268 clk_disable(bp->hclk);
1271 clk_disable(bp->pclk);
1274 platform_set_drvdata(pdev, NULL);
1281 static int macb_suspend(struct platform_device *pdev, pm_message_t state)
1283 struct net_device *netdev = platform_get_drvdata(pdev);
1284 struct macb *bp = netdev_priv(netdev);
1286 netif_device_detach(netdev);
1288 #ifndef CONFIG_ARCH_AT91
1289 clk_disable(bp->hclk);
1291 clk_disable(bp->pclk);
1296 static int macb_resume(struct platform_device *pdev)
1298 struct net_device *netdev = platform_get_drvdata(pdev);
1299 struct macb *bp = netdev_priv(netdev);
1301 clk_enable(bp->pclk);
1302 #ifndef CONFIG_ARCH_AT91
1303 clk_enable(bp->hclk);
1306 netif_device_attach(netdev);
1311 #define macb_suspend NULL
1312 #define macb_resume NULL
1315 static struct platform_driver macb_driver = {
1316 .remove = __exit_p(macb_remove),
1317 .suspend = macb_suspend,
1318 .resume = macb_resume,
1321 .owner = THIS_MODULE,
1325 static int __init macb_init(void)
1327 return platform_driver_probe(&macb_driver, macb_probe);
1330 static void __exit macb_exit(void)
1332 platform_driver_unregister(&macb_driver);
1335 module_init(macb_init);
1336 module_exit(macb_exit);
1338 MODULE_LICENSE("GPL");
1339 MODULE_DESCRIPTION("Atmel MACB Ethernet driver");
1340 MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
1341 MODULE_ALIAS("platform:macb");