2 * Network device driver for the MACE ethernet controller on
3 * Apple Powermacs. Assumes it's under a DBDMA controller.
5 * Copyright (C) 1996 Paul Mackerras.
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <linux/delay.h>
13 #include <linux/string.h>
14 #include <linux/timer.h>
15 #include <linux/init.h>
16 #include <linux/crc32.h>
17 #include <linux/spinlock.h>
19 #include <asm/dbdma.h>
21 #include <asm/pgtable.h>
22 #include <asm/macio.h>
26 static int port_aaui = -1;
30 #define MAX_TX_ACTIVE 1
31 #define NCMDS_TX 1 /* dma commands per element in tx ring */
32 #define RX_BUFLEN (ETH_FRAME_LEN + 8)
33 #define TX_TIMEOUT HZ /* 1 second */
35 /* Chip rev needs workaround on HW & multicast addr change */
36 #define BROKEN_ADDRCHG_REV 0x0941
38 /* Bits in transmit DMA status */
39 #define TX_DMA_ERR 0x80
42 volatile struct mace __iomem *mace;
43 volatile struct dbdma_regs __iomem *tx_dma;
45 volatile struct dbdma_regs __iomem *rx_dma;
47 volatile struct dbdma_cmd *tx_cmds; /* xmit dma command list */
48 volatile struct dbdma_cmd *rx_cmds; /* recv dma command list */
49 struct sk_buff *rx_bufs[N_RX_RING];
52 struct sk_buff *tx_bufs[N_TX_RING];
56 unsigned char tx_fullup;
57 unsigned char tx_active;
58 unsigned char tx_bad_runt;
59 struct net_device_stats stats;
60 struct timer_list tx_timeout;
64 struct macio_dev *mdev;
69 * Number of bytes of private data per MACE: allow enough for
70 * the rx and tx dma commands plus a branch dma command each,
71 * and another 16 bytes to allow us to align the dma command
72 * buffers on a 16 byte boundary.
74 #define PRIV_BYTES (sizeof(struct mace_data) \
75 + (N_RX_RING + NCMDS_TX * N_TX_RING + 3) * sizeof(struct dbdma_cmd))
77 static int bitrev(int);
78 static int mace_open(struct net_device *dev);
79 static int mace_close(struct net_device *dev);
80 static int mace_xmit_start(struct sk_buff *skb, struct net_device *dev);
81 static struct net_device_stats *mace_stats(struct net_device *dev);
82 static void mace_set_multicast(struct net_device *dev);
83 static void mace_reset(struct net_device *dev);
84 static int mace_set_address(struct net_device *dev, void *addr);
85 static irqreturn_t mace_interrupt(int irq, void *dev_id);
86 static irqreturn_t mace_txdma_intr(int irq, void *dev_id);
87 static irqreturn_t mace_rxdma_intr(int irq, void *dev_id);
88 static void mace_set_timeout(struct net_device *dev);
89 static void mace_tx_timeout(unsigned long data);
90 static inline void dbdma_reset(volatile struct dbdma_regs __iomem *dma);
91 static inline void mace_clean_rings(struct mace_data *mp);
92 static void __mace_set_address(struct net_device *dev, void *addr);
95 * If we can't get a skbuff when we need it, we use this area for DMA.
97 static unsigned char *dummy_buf;
99 /* Bit-reverse one byte of an ethernet hardware address. */
105 for (i = 0; i < 8; ++i, b >>= 1)
106 d = (d << 1) | (b & 1);
111 static int __devinit mace_probe(struct macio_dev *mdev, const struct of_device_id *match)
113 struct device_node *mace = macio_get_of_node(mdev);
114 struct net_device *dev;
115 struct mace_data *mp;
116 const unsigned char *addr;
117 int j, rev, rc = -EBUSY;
119 if (macio_resource_count(mdev) != 3 || macio_irq_count(mdev) != 3) {
120 printk(KERN_ERR "can't use MACE %s: need 3 addrs and 3 irqs\n",
125 addr = get_property(mace, "mac-address", NULL);
127 addr = get_property(mace, "local-mac-address", NULL);
129 printk(KERN_ERR "Can't get mac-address for MACE %s\n",
136 * lazy allocate the driver-wide dummy buffer. (Note that we
137 * never have more than one MACE in the system anyway)
139 if (dummy_buf == NULL) {
140 dummy_buf = kmalloc(RX_BUFLEN+2, GFP_KERNEL);
141 if (dummy_buf == NULL) {
142 printk(KERN_ERR "MACE: couldn't allocate dummy buffer\n");
147 if (macio_request_resources(mdev, "mace")) {
148 printk(KERN_ERR "MACE: can't request IO resources !\n");
152 dev = alloc_etherdev(PRIV_BYTES);
154 printk(KERN_ERR "MACE: can't allocate ethernet device !\n");
158 SET_MODULE_OWNER(dev);
159 SET_NETDEV_DEV(dev, &mdev->ofdev.dev);
163 macio_set_drvdata(mdev, dev);
165 dev->base_addr = macio_resource_start(mdev, 0);
166 mp->mace = ioremap(dev->base_addr, 0x1000);
167 if (mp->mace == NULL) {
168 printk(KERN_ERR "MACE: can't map IO resources !\n");
172 dev->irq = macio_irq(mdev, 0);
174 rev = addr[0] == 0 && addr[1] == 0xA0;
175 for (j = 0; j < 6; ++j) {
176 dev->dev_addr[j] = rev? bitrev(addr[j]): addr[j];
178 mp->chipid = (in_8(&mp->mace->chipid_hi) << 8) |
179 in_8(&mp->mace->chipid_lo);
182 mp = (struct mace_data *) dev->priv;
183 mp->maccc = ENXMT | ENRCV;
185 mp->tx_dma = ioremap(macio_resource_start(mdev, 1), 0x1000);
186 if (mp->tx_dma == NULL) {
187 printk(KERN_ERR "MACE: can't map TX DMA resources !\n");
191 mp->tx_dma_intr = macio_irq(mdev, 1);
193 mp->rx_dma = ioremap(macio_resource_start(mdev, 2), 0x1000);
194 if (mp->rx_dma == NULL) {
195 printk(KERN_ERR "MACE: can't map RX DMA resources !\n");
197 goto err_unmap_tx_dma;
199 mp->rx_dma_intr = macio_irq(mdev, 2);
201 mp->tx_cmds = (volatile struct dbdma_cmd *) DBDMA_ALIGN(mp + 1);
202 mp->rx_cmds = mp->tx_cmds + NCMDS_TX * N_TX_RING + 1;
204 memset(&mp->stats, 0, sizeof(mp->stats));
205 memset((char *) mp->tx_cmds, 0,
206 (NCMDS_TX*N_TX_RING + N_RX_RING + 2) * sizeof(struct dbdma_cmd));
207 init_timer(&mp->tx_timeout);
208 spin_lock_init(&mp->lock);
209 mp->timeout_active = 0;
212 mp->port_aaui = port_aaui;
214 /* Apple Network Server uses the AAUI port */
215 if (machine_is_compatible("AAPL,ShinerESB"))
218 #ifdef CONFIG_MACE_AAUI_PORT
226 dev->open = mace_open;
227 dev->stop = mace_close;
228 dev->hard_start_xmit = mace_xmit_start;
229 dev->get_stats = mace_stats;
230 dev->set_multicast_list = mace_set_multicast;
231 dev->set_mac_address = mace_set_address;
234 * Most of what is below could be moved to mace_open()
238 rc = request_irq(dev->irq, mace_interrupt, 0, "MACE", dev);
240 printk(KERN_ERR "MACE: can't get irq %d\n", dev->irq);
241 goto err_unmap_rx_dma;
243 rc = request_irq(mp->tx_dma_intr, mace_txdma_intr, 0, "MACE-txdma", dev);
245 printk(KERN_ERR "MACE: can't get irq %d\n", mp->tx_dma_intr);
248 rc = request_irq(mp->rx_dma_intr, mace_rxdma_intr, 0, "MACE-rxdma", dev);
250 printk(KERN_ERR "MACE: can't get irq %d\n", mp->rx_dma_intr);
251 goto err_free_tx_irq;
254 rc = register_netdev(dev);
256 printk(KERN_ERR "MACE: Cannot register net device, aborting.\n");
257 goto err_free_rx_irq;
260 printk(KERN_INFO "%s: MACE at", dev->name);
261 for (j = 0; j < 6; ++j) {
262 printk("%c%.2x", (j? ':': ' '), dev->dev_addr[j]);
264 printk(", chip revision %d.%d\n", mp->chipid >> 8, mp->chipid & 0xff);
269 free_irq(macio_irq(mdev, 2), dev);
271 free_irq(macio_irq(mdev, 1), dev);
273 free_irq(macio_irq(mdev, 0), dev);
283 macio_release_resources(mdev);
288 static int __devexit mace_remove(struct macio_dev *mdev)
290 struct net_device *dev = macio_get_drvdata(mdev);
291 struct mace_data *mp;
295 macio_set_drvdata(mdev, NULL);
299 unregister_netdev(dev);
301 free_irq(dev->irq, dev);
302 free_irq(mp->tx_dma_intr, dev);
303 free_irq(mp->rx_dma_intr, dev);
311 macio_release_resources(mdev);
316 static void dbdma_reset(volatile struct dbdma_regs __iomem *dma)
320 out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16);
323 * Yes this looks peculiar, but apparently it needs to be this
324 * way on some machines.
326 for (i = 200; i > 0; --i)
327 if (ld_le32(&dma->control) & RUN)
331 static void mace_reset(struct net_device *dev)
333 struct mace_data *mp = (struct mace_data *) dev->priv;
334 volatile struct mace __iomem *mb = mp->mace;
337 /* soft-reset the chip */
340 out_8(&mb->biucc, SWRST);
341 if (in_8(&mb->biucc) & SWRST) {
348 printk(KERN_ERR "mace: cannot reset chip!\n");
352 out_8(&mb->imr, 0xff); /* disable all intrs for now */
354 out_8(&mb->maccc, 0); /* turn off tx, rx */
356 out_8(&mb->biucc, XMTSP_64);
357 out_8(&mb->utr, RTRD);
358 out_8(&mb->fifocc, RCVFW_32 | XMTFW_16 | XMTFWU | RCVFWU | XMTBRST);
359 out_8(&mb->xmtfc, AUTO_PAD_XMIT); /* auto-pad short frames */
360 out_8(&mb->rcvfc, 0);
362 /* load up the hardware address */
363 __mace_set_address(dev, dev->dev_addr);
365 /* clear the multicast filter */
366 if (mp->chipid == BROKEN_ADDRCHG_REV)
367 out_8(&mb->iac, LOGADDR);
369 out_8(&mb->iac, ADDRCHG | LOGADDR);
370 while ((in_8(&mb->iac) & ADDRCHG) != 0)
373 for (i = 0; i < 8; ++i)
374 out_8(&mb->ladrf, 0);
376 /* done changing address */
377 if (mp->chipid != BROKEN_ADDRCHG_REV)
381 out_8(&mb->plscc, PORTSEL_AUI + ENPLSIO);
383 out_8(&mb->plscc, PORTSEL_GPSI + ENPLSIO);
386 static void __mace_set_address(struct net_device *dev, void *addr)
388 struct mace_data *mp = (struct mace_data *) dev->priv;
389 volatile struct mace __iomem *mb = mp->mace;
390 unsigned char *p = addr;
393 /* load up the hardware address */
394 if (mp->chipid == BROKEN_ADDRCHG_REV)
395 out_8(&mb->iac, PHYADDR);
397 out_8(&mb->iac, ADDRCHG | PHYADDR);
398 while ((in_8(&mb->iac) & ADDRCHG) != 0)
401 for (i = 0; i < 6; ++i)
402 out_8(&mb->padr, dev->dev_addr[i] = p[i]);
403 if (mp->chipid != BROKEN_ADDRCHG_REV)
407 static int mace_set_address(struct net_device *dev, void *addr)
409 struct mace_data *mp = (struct mace_data *) dev->priv;
410 volatile struct mace __iomem *mb = mp->mace;
413 spin_lock_irqsave(&mp->lock, flags);
415 __mace_set_address(dev, addr);
417 /* note: setting ADDRCHG clears ENRCV */
418 out_8(&mb->maccc, mp->maccc);
420 spin_unlock_irqrestore(&mp->lock, flags);
424 static inline void mace_clean_rings(struct mace_data *mp)
428 /* free some skb's */
429 for (i = 0; i < N_RX_RING; ++i) {
430 if (mp->rx_bufs[i] != 0) {
431 dev_kfree_skb(mp->rx_bufs[i]);
432 mp->rx_bufs[i] = NULL;
435 for (i = mp->tx_empty; i != mp->tx_fill; ) {
436 dev_kfree_skb(mp->tx_bufs[i]);
437 if (++i >= N_TX_RING)
442 static int mace_open(struct net_device *dev)
444 struct mace_data *mp = (struct mace_data *) dev->priv;
445 volatile struct mace __iomem *mb = mp->mace;
446 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
447 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
448 volatile struct dbdma_cmd *cp;
456 /* initialize list of sk_buffs for receiving and set up recv dma */
457 mace_clean_rings(mp);
458 memset((char *)mp->rx_cmds, 0, N_RX_RING * sizeof(struct dbdma_cmd));
460 for (i = 0; i < N_RX_RING - 1; ++i) {
461 skb = dev_alloc_skb(RX_BUFLEN + 2);
465 skb_reserve(skb, 2); /* so IP header lands on 4-byte bdry */
468 mp->rx_bufs[i] = skb;
469 st_le16(&cp->req_count, RX_BUFLEN);
470 st_le16(&cp->command, INPUT_LAST + INTR_ALWAYS);
471 st_le32(&cp->phy_addr, virt_to_bus(data));
475 mp->rx_bufs[i] = NULL;
476 st_le16(&cp->command, DBDMA_STOP);
480 /* Put a branch back to the beginning of the receive command list */
482 st_le16(&cp->command, DBDMA_NOP + BR_ALWAYS);
483 st_le32(&cp->cmd_dep, virt_to_bus(mp->rx_cmds));
486 out_le32(&rd->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
487 out_le32(&rd->cmdptr, virt_to_bus(mp->rx_cmds));
488 out_le32(&rd->control, (RUN << 16) | RUN);
490 /* put a branch at the end of the tx command list */
491 cp = mp->tx_cmds + NCMDS_TX * N_TX_RING;
492 st_le16(&cp->command, DBDMA_NOP + BR_ALWAYS);
493 st_le32(&cp->cmd_dep, virt_to_bus(mp->tx_cmds));
496 out_le32(&td->control, (RUN|PAUSE|FLUSH|WAKE) << 16);
497 out_le32(&td->cmdptr, virt_to_bus(mp->tx_cmds));
505 out_8(&mb->maccc, mp->maccc);
506 /* enable all interrupts except receive interrupts */
507 out_8(&mb->imr, RCVINT);
512 static int mace_close(struct net_device *dev)
514 struct mace_data *mp = (struct mace_data *) dev->priv;
515 volatile struct mace __iomem *mb = mp->mace;
516 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
517 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
519 /* disable rx and tx */
520 out_8(&mb->maccc, 0);
521 out_8(&mb->imr, 0xff); /* disable all intrs */
523 /* disable rx and tx dma */
524 st_le32(&rd->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
525 st_le32(&td->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
527 mace_clean_rings(mp);
532 static inline void mace_set_timeout(struct net_device *dev)
534 struct mace_data *mp = (struct mace_data *) dev->priv;
536 if (mp->timeout_active)
537 del_timer(&mp->tx_timeout);
538 mp->tx_timeout.expires = jiffies + TX_TIMEOUT;
539 mp->tx_timeout.function = mace_tx_timeout;
540 mp->tx_timeout.data = (unsigned long) dev;
541 add_timer(&mp->tx_timeout);
542 mp->timeout_active = 1;
545 static int mace_xmit_start(struct sk_buff *skb, struct net_device *dev)
547 struct mace_data *mp = (struct mace_data *) dev->priv;
548 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
549 volatile struct dbdma_cmd *cp, *np;
553 /* see if there's a free slot in the tx ring */
554 spin_lock_irqsave(&mp->lock, flags);
557 if (next >= N_TX_RING)
559 if (next == mp->tx_empty) {
560 netif_stop_queue(dev);
562 spin_unlock_irqrestore(&mp->lock, flags);
563 return 1; /* can't take it at the moment */
565 spin_unlock_irqrestore(&mp->lock, flags);
567 /* partially fill in the dma command block */
569 if (len > ETH_FRAME_LEN) {
570 printk(KERN_DEBUG "mace: xmit frame too long (%d)\n", len);
573 mp->tx_bufs[fill] = skb;
574 cp = mp->tx_cmds + NCMDS_TX * fill;
575 st_le16(&cp->req_count, len);
576 st_le32(&cp->phy_addr, virt_to_bus(skb->data));
578 np = mp->tx_cmds + NCMDS_TX * next;
579 out_le16(&np->command, DBDMA_STOP);
581 /* poke the tx dma channel */
582 spin_lock_irqsave(&mp->lock, flags);
584 if (!mp->tx_bad_runt && mp->tx_active < MAX_TX_ACTIVE) {
585 out_le16(&cp->xfer_status, 0);
586 out_le16(&cp->command, OUTPUT_LAST);
587 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
589 mace_set_timeout(dev);
591 if (++next >= N_TX_RING)
593 if (next == mp->tx_empty)
594 netif_stop_queue(dev);
595 spin_unlock_irqrestore(&mp->lock, flags);
600 static struct net_device_stats *mace_stats(struct net_device *dev)
602 struct mace_data *p = (struct mace_data *) dev->priv;
607 static void mace_set_multicast(struct net_device *dev)
609 struct mace_data *mp = (struct mace_data *) dev->priv;
610 volatile struct mace __iomem *mb = mp->mace;
615 spin_lock_irqsave(&mp->lock, flags);
617 if (dev->flags & IFF_PROMISC) {
620 unsigned char multicast_filter[8];
621 struct dev_mc_list *dmi = dev->mc_list;
623 if (dev->flags & IFF_ALLMULTI) {
624 for (i = 0; i < 8; i++)
625 multicast_filter[i] = 0xff;
627 for (i = 0; i < 8; i++)
628 multicast_filter[i] = 0;
629 for (i = 0; i < dev->mc_count; i++) {
630 crc = ether_crc_le(6, dmi->dmi_addr);
631 j = crc >> 26; /* bit number in multicast_filter */
632 multicast_filter[j >> 3] |= 1 << (j & 7);
637 printk("Multicast filter :");
638 for (i = 0; i < 8; i++)
639 printk("%02x ", multicast_filter[i]);
643 if (mp->chipid == BROKEN_ADDRCHG_REV)
644 out_8(&mb->iac, LOGADDR);
646 out_8(&mb->iac, ADDRCHG | LOGADDR);
647 while ((in_8(&mb->iac) & ADDRCHG) != 0)
650 for (i = 0; i < 8; ++i)
651 out_8(&mb->ladrf, multicast_filter[i]);
652 if (mp->chipid != BROKEN_ADDRCHG_REV)
656 out_8(&mb->maccc, mp->maccc);
657 spin_unlock_irqrestore(&mp->lock, flags);
660 static void mace_handle_misc_intrs(struct mace_data *mp, int intr)
662 volatile struct mace __iomem *mb = mp->mace;
663 static int mace_babbles, mace_jabbers;
666 mp->stats.rx_missed_errors += 256;
667 mp->stats.rx_missed_errors += in_8(&mb->mpc); /* reading clears it */
669 mp->stats.rx_length_errors += 256;
670 mp->stats.rx_length_errors += in_8(&mb->rntpc); /* reading clears it */
672 ++mp->stats.tx_heartbeat_errors;
674 if (mace_babbles++ < 4)
675 printk(KERN_DEBUG "mace: babbling transmitter\n");
677 if (mace_jabbers++ < 4)
678 printk(KERN_DEBUG "mace: jabbering transceiver\n");
681 static irqreturn_t mace_interrupt(int irq, void *dev_id)
683 struct net_device *dev = (struct net_device *) dev_id;
684 struct mace_data *mp = (struct mace_data *) dev->priv;
685 volatile struct mace __iomem *mb = mp->mace;
686 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
687 volatile struct dbdma_cmd *cp;
688 int intr, fs, i, stat, x;
691 /* static int mace_last_fs, mace_last_xcount; */
693 spin_lock_irqsave(&mp->lock, flags);
694 intr = in_8(&mb->ir); /* read interrupt register */
695 in_8(&mb->xmtrc); /* get retries */
696 mace_handle_misc_intrs(mp, intr);
699 while (in_8(&mb->pr) & XMTSV) {
700 del_timer(&mp->tx_timeout);
701 mp->timeout_active = 0;
703 * Clear any interrupt indication associated with this status
704 * word. This appears to unlatch any error indication from
705 * the DMA controller.
707 intr = in_8(&mb->ir);
709 mace_handle_misc_intrs(mp, intr);
710 if (mp->tx_bad_runt) {
711 fs = in_8(&mb->xmtfs);
713 out_8(&mb->xmtfc, AUTO_PAD_XMIT);
716 dstat = ld_le32(&td->status);
717 /* stop DMA controller */
718 out_le32(&td->control, RUN << 16);
720 * xcount is the number of complete frames which have been
721 * written to the fifo but for which status has not been read.
723 xcount = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK;
724 if (xcount == 0 || (dstat & DEAD)) {
726 * If a packet was aborted before the DMA controller has
727 * finished transferring it, it seems that there are 2 bytes
728 * which are stuck in some buffer somewhere. These will get
729 * transmitted as soon as we read the frame status (which
730 * reenables the transmit data transfer request). Turning
731 * off the DMA controller and/or resetting the MACE doesn't
732 * help. So we disable auto-padding and FCS transmission
733 * so the two bytes will only be a runt packet which should
734 * be ignored by other stations.
736 out_8(&mb->xmtfc, DXMTFCS);
738 fs = in_8(&mb->xmtfs);
739 if ((fs & XMTSV) == 0) {
740 printk(KERN_ERR "mace: xmtfs not valid! (fs=%x xc=%d ds=%x)\n",
744 * XXX mace likes to hang the machine after a xmtfs error.
745 * This is hard to reproduce, reseting *may* help
748 cp = mp->tx_cmds + NCMDS_TX * i;
749 stat = ld_le16(&cp->xfer_status);
750 if ((fs & (UFLO|LCOL|LCAR|RTRY)) || (dstat & DEAD) || xcount == 0) {
752 * Check whether there were in fact 2 bytes written to
756 x = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK;
758 /* there were two bytes with an end-of-packet indication */
760 mace_set_timeout(dev);
763 * Either there weren't the two bytes buffered up, or they
764 * didn't have an end-of-packet indication.
765 * We flush the transmit FIFO just in case (by setting the
766 * XMTFWU bit with the transmitter disabled).
768 out_8(&mb->maccc, in_8(&mb->maccc) & ~ENXMT);
769 out_8(&mb->fifocc, in_8(&mb->fifocc) | XMTFWU);
771 out_8(&mb->maccc, in_8(&mb->maccc) | ENXMT);
772 out_8(&mb->xmtfc, AUTO_PAD_XMIT);
775 /* dma should have finished */
776 if (i == mp->tx_fill) {
777 printk(KERN_DEBUG "mace: tx ring ran out? (fs=%x xc=%d ds=%x)\n",
782 if (fs & (UFLO|LCOL|LCAR|RTRY)) {
783 ++mp->stats.tx_errors;
785 ++mp->stats.tx_carrier_errors;
786 if (fs & (UFLO|LCOL|RTRY))
787 ++mp->stats.tx_aborted_errors;
789 mp->stats.tx_bytes += mp->tx_bufs[i]->len;
790 ++mp->stats.tx_packets;
792 dev_kfree_skb_irq(mp->tx_bufs[i]);
794 if (++i >= N_TX_RING)
798 mace_last_xcount = xcount;
802 if (i != mp->tx_empty) {
804 netif_wake_queue(dev);
810 if (!mp->tx_bad_runt && i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE) {
812 /* set up the next one */
813 cp = mp->tx_cmds + NCMDS_TX * i;
814 out_le16(&cp->xfer_status, 0);
815 out_le16(&cp->command, OUTPUT_LAST);
817 if (++i >= N_TX_RING)
819 } while (i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE);
820 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
821 mace_set_timeout(dev);
823 spin_unlock_irqrestore(&mp->lock, flags);
827 static void mace_tx_timeout(unsigned long data)
829 struct net_device *dev = (struct net_device *) data;
830 struct mace_data *mp = (struct mace_data *) dev->priv;
831 volatile struct mace __iomem *mb = mp->mace;
832 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
833 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
834 volatile struct dbdma_cmd *cp;
838 spin_lock_irqsave(&mp->lock, flags);
839 mp->timeout_active = 0;
840 if (mp->tx_active == 0 && !mp->tx_bad_runt)
843 /* update various counters */
844 mace_handle_misc_intrs(mp, in_8(&mb->ir));
846 cp = mp->tx_cmds + NCMDS_TX * mp->tx_empty;
848 /* turn off both tx and rx and reset the chip */
849 out_8(&mb->maccc, 0);
850 printk(KERN_ERR "mace: transmit timeout - resetting\n");
855 cp = bus_to_virt(ld_le32(&rd->cmdptr));
857 out_le16(&cp->xfer_status, 0);
858 out_le32(&rd->cmdptr, virt_to_bus(cp));
859 out_le32(&rd->control, (RUN << 16) | RUN);
861 /* fix up the transmit side */
864 ++mp->stats.tx_errors;
865 if (mp->tx_bad_runt) {
867 } else if (i != mp->tx_fill) {
868 dev_kfree_skb(mp->tx_bufs[i]);
869 if (++i >= N_TX_RING)
874 netif_wake_queue(dev);
875 if (i != mp->tx_fill) {
876 cp = mp->tx_cmds + NCMDS_TX * i;
877 out_le16(&cp->xfer_status, 0);
878 out_le16(&cp->command, OUTPUT_LAST);
879 out_le32(&td->cmdptr, virt_to_bus(cp));
880 out_le32(&td->control, (RUN << 16) | RUN);
882 mace_set_timeout(dev);
885 /* turn it back on */
886 out_8(&mb->imr, RCVINT);
887 out_8(&mb->maccc, mp->maccc);
890 spin_unlock_irqrestore(&mp->lock, flags);
893 static irqreturn_t mace_txdma_intr(int irq, void *dev_id)
898 static irqreturn_t mace_rxdma_intr(int irq, void *dev_id)
900 struct net_device *dev = (struct net_device *) dev_id;
901 struct mace_data *mp = (struct mace_data *) dev->priv;
902 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
903 volatile struct dbdma_cmd *cp, *np;
904 int i, nb, stat, next;
906 unsigned frame_status;
907 static int mace_lost_status;
911 spin_lock_irqsave(&mp->lock, flags);
912 for (i = mp->rx_empty; i != mp->rx_fill; ) {
913 cp = mp->rx_cmds + i;
914 stat = ld_le16(&cp->xfer_status);
915 if ((stat & ACTIVE) == 0) {
917 if (next >= N_RX_RING)
919 np = mp->rx_cmds + next;
920 if (next != mp->rx_fill
921 && (ld_le16(&np->xfer_status) & ACTIVE) != 0) {
922 printk(KERN_DEBUG "mace: lost a status word\n");
927 nb = ld_le16(&cp->req_count) - ld_le16(&cp->res_count);
928 out_le16(&cp->command, DBDMA_STOP);
929 /* got a packet, have a look at it */
930 skb = mp->rx_bufs[i];
932 ++mp->stats.rx_dropped;
935 frame_status = (data[nb-3] << 8) + data[nb-4];
936 if (frame_status & (RS_OFLO|RS_CLSN|RS_FRAMERR|RS_FCSERR)) {
937 ++mp->stats.rx_errors;
938 if (frame_status & RS_OFLO)
939 ++mp->stats.rx_over_errors;
940 if (frame_status & RS_FRAMERR)
941 ++mp->stats.rx_frame_errors;
942 if (frame_status & RS_FCSERR)
943 ++mp->stats.rx_crc_errors;
945 /* Mace feature AUTO_STRIP_RCV is on by default, dropping the
946 * FCS on frames with 802.3 headers. This means that Ethernet
947 * frames have 8 extra octets at the end, while 802.3 frames
948 * have only 4. We need to correctly account for this. */
949 if (*(unsigned short *)(data+12) < 1536) /* 802.3 header */
951 else /* Ethernet header; mace includes FCS */
955 skb->protocol = eth_type_trans(skb, dev);
956 mp->stats.rx_bytes += skb->len;
958 dev->last_rx = jiffies;
959 mp->rx_bufs[i] = NULL;
960 ++mp->stats.rx_packets;
963 ++mp->stats.rx_errors;
964 ++mp->stats.rx_length_errors;
967 /* advance to next */
968 if (++i >= N_RX_RING)
976 if (next >= N_RX_RING)
978 if (next == mp->rx_empty)
980 cp = mp->rx_cmds + i;
981 skb = mp->rx_bufs[i];
983 skb = dev_alloc_skb(RX_BUFLEN + 2);
986 mp->rx_bufs[i] = skb;
989 st_le16(&cp->req_count, RX_BUFLEN);
990 data = skb? skb->data: dummy_buf;
991 st_le32(&cp->phy_addr, virt_to_bus(data));
992 out_le16(&cp->xfer_status, 0);
993 out_le16(&cp->command, INPUT_LAST + INTR_ALWAYS);
995 if ((ld_le32(&rd->status) & ACTIVE) != 0) {
996 out_le32(&rd->control, (PAUSE << 16) | PAUSE);
997 while ((in_le32(&rd->status) & ACTIVE) != 0)
1003 if (i != mp->rx_fill) {
1004 out_le32(&rd->control, ((RUN|WAKE) << 16) | (RUN|WAKE));
1007 spin_unlock_irqrestore(&mp->lock, flags);
1011 static struct of_device_id mace_match[] =
1018 MODULE_DEVICE_TABLE (of, mace_match);
1020 static struct macio_driver mace_driver =
1023 .match_table = mace_match,
1024 .probe = mace_probe,
1025 .remove = mace_remove,
1029 static int __init mace_init(void)
1031 return macio_register_driver(&mace_driver);
1034 static void __exit mace_cleanup(void)
1036 macio_unregister_driver(&mace_driver);
1042 MODULE_AUTHOR("Paul Mackerras");
1043 MODULE_DESCRIPTION("PowerMac MACE driver.");
1044 module_param(port_aaui, int, 0);
1045 MODULE_PARM_DESC(port_aaui, "MACE uses AAUI port (0-1)");
1046 MODULE_LICENSE("GPL");
1048 module_init(mace_init);
1049 module_exit(mace_cleanup);