1 // SPDX-License-Identifier: GPL-2.0-only
3 * Network device driver for the MACE ethernet controller on
4 * Apple Powermacs. Assumes it's under a DBDMA controller.
6 * Copyright (C) 1996 Paul Mackerras.
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/netdevice.h>
12 #include <linux/etherdevice.h>
13 #include <linux/delay.h>
14 #include <linux/string.h>
15 #include <linux/timer.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/crc32.h>
19 #include <linux/spinlock.h>
20 #include <linux/bitrev.h>
21 #include <linux/slab.h>
22 #include <linux/pgtable.h>
23 #include <asm/dbdma.h>
25 #include <asm/macio.h>
29 static int port_aaui = -1;
33 #define MAX_TX_ACTIVE 1
34 #define NCMDS_TX 1 /* dma commands per element in tx ring */
35 #define RX_BUFLEN (ETH_FRAME_LEN + 8)
36 #define TX_TIMEOUT HZ /* 1 second */
38 /* Chip rev needs workaround on HW & multicast addr change */
39 #define BROKEN_ADDRCHG_REV 0x0941
41 /* Bits in transmit DMA status */
42 #define TX_DMA_ERR 0x80
45 volatile struct mace __iomem *mace;
46 volatile struct dbdma_regs __iomem *tx_dma;
48 volatile struct dbdma_regs __iomem *rx_dma;
50 volatile struct dbdma_cmd *tx_cmds; /* xmit dma command list */
51 volatile struct dbdma_cmd *rx_cmds; /* recv dma command list */
52 struct sk_buff *rx_bufs[N_RX_RING];
55 struct sk_buff *tx_bufs[N_TX_RING];
59 unsigned char tx_fullup;
60 unsigned char tx_active;
61 unsigned char tx_bad_runt;
62 struct timer_list tx_timeout;
66 struct macio_dev *mdev;
71 * Number of bytes of private data per MACE: allow enough for
72 * the rx and tx dma commands plus a branch dma command each,
73 * and another 16 bytes to allow us to align the dma command
74 * buffers on a 16 byte boundary.
76 #define PRIV_BYTES (sizeof(struct mace_data) \
77 + (N_RX_RING + NCMDS_TX * N_TX_RING + 3) * sizeof(struct dbdma_cmd))
79 static int mace_open(struct net_device *dev);
80 static int mace_close(struct net_device *dev);
81 static netdev_tx_t mace_xmit_start(struct sk_buff *skb, 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(struct timer_list *t);
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, const 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 static const struct net_device_ops mace_netdev_ops = {
100 .ndo_open = mace_open,
101 .ndo_stop = mace_close,
102 .ndo_start_xmit = mace_xmit_start,
103 .ndo_set_rx_mode = mace_set_multicast,
104 .ndo_set_mac_address = mace_set_address,
105 .ndo_validate_addr = eth_validate_addr,
108 static int mace_probe(struct macio_dev *mdev, const struct of_device_id *match)
110 struct device_node *mace = macio_get_of_node(mdev);
111 struct net_device *dev;
112 struct mace_data *mp;
113 const unsigned char *addr;
114 u8 macaddr[ETH_ALEN];
115 int j, rev, rc = -EBUSY;
117 if (macio_resource_count(mdev) != 3 || macio_irq_count(mdev) != 3) {
118 printk(KERN_ERR "can't use MACE %pOF: need 3 addrs and 3 irqs\n",
123 addr = of_get_property(mace, "mac-address", NULL);
125 addr = of_get_property(mace, "local-mac-address", NULL);
127 printk(KERN_ERR "Can't get mac-address for MACE %pOF\n",
134 * lazy allocate the driver-wide dummy buffer. (Note that we
135 * never have more than one MACE in the system anyway)
137 if (dummy_buf == NULL) {
138 dummy_buf = kmalloc(RX_BUFLEN+2, GFP_KERNEL);
139 if (dummy_buf == NULL)
143 if (macio_request_resources(mdev, "mace")) {
144 printk(KERN_ERR "MACE: can't request IO resources !\n");
148 dev = alloc_etherdev(PRIV_BYTES);
153 SET_NETDEV_DEV(dev, &mdev->ofdev.dev);
155 mp = netdev_priv(dev);
157 macio_set_drvdata(mdev, dev);
159 dev->base_addr = macio_resource_start(mdev, 0);
160 mp->mace = ioremap(dev->base_addr, 0x1000);
161 if (mp->mace == NULL) {
162 printk(KERN_ERR "MACE: can't map IO resources !\n");
166 dev->irq = macio_irq(mdev, 0);
168 rev = addr[0] == 0 && addr[1] == 0xA0;
169 for (j = 0; j < 6; ++j) {
170 macaddr[j] = rev ? bitrev8(addr[j]): addr[j];
172 eth_hw_addr_set(dev, macaddr);
173 mp->chipid = (in_8(&mp->mace->chipid_hi) << 8) |
174 in_8(&mp->mace->chipid_lo);
177 mp = netdev_priv(dev);
178 mp->maccc = ENXMT | ENRCV;
180 mp->tx_dma = ioremap(macio_resource_start(mdev, 1), 0x1000);
181 if (mp->tx_dma == NULL) {
182 printk(KERN_ERR "MACE: can't map TX DMA resources !\n");
186 mp->tx_dma_intr = macio_irq(mdev, 1);
188 mp->rx_dma = ioremap(macio_resource_start(mdev, 2), 0x1000);
189 if (mp->rx_dma == NULL) {
190 printk(KERN_ERR "MACE: can't map RX DMA resources !\n");
192 goto err_unmap_tx_dma;
194 mp->rx_dma_intr = macio_irq(mdev, 2);
196 mp->tx_cmds = (volatile struct dbdma_cmd *) DBDMA_ALIGN(mp + 1);
197 mp->rx_cmds = mp->tx_cmds + NCMDS_TX * N_TX_RING + 1;
199 memset((char *) mp->tx_cmds, 0,
200 (NCMDS_TX*N_TX_RING + N_RX_RING + 2) * sizeof(struct dbdma_cmd));
201 timer_setup(&mp->tx_timeout, mace_tx_timeout, 0);
202 spin_lock_init(&mp->lock);
203 mp->timeout_active = 0;
206 mp->port_aaui = port_aaui;
208 /* Apple Network Server uses the AAUI port */
209 if (of_machine_is_compatible("AAPL,ShinerESB"))
212 #ifdef CONFIG_MACE_AAUI_PORT
220 dev->netdev_ops = &mace_netdev_ops;
223 * Most of what is below could be moved to mace_open()
227 rc = request_irq(dev->irq, mace_interrupt, 0, "MACE", dev);
229 printk(KERN_ERR "MACE: can't get irq %d\n", dev->irq);
230 goto err_unmap_rx_dma;
232 rc = request_irq(mp->tx_dma_intr, mace_txdma_intr, 0, "MACE-txdma", dev);
234 printk(KERN_ERR "MACE: can't get irq %d\n", mp->tx_dma_intr);
237 rc = request_irq(mp->rx_dma_intr, mace_rxdma_intr, 0, "MACE-rxdma", dev);
239 printk(KERN_ERR "MACE: can't get irq %d\n", mp->rx_dma_intr);
240 goto err_free_tx_irq;
243 rc = register_netdev(dev);
245 printk(KERN_ERR "MACE: Cannot register net device, aborting.\n");
246 goto err_free_rx_irq;
249 printk(KERN_INFO "%s: MACE at %pM, chip revision %d.%d\n",
250 dev->name, dev->dev_addr,
251 mp->chipid >> 8, mp->chipid & 0xff);
256 free_irq(macio_irq(mdev, 2), dev);
258 free_irq(macio_irq(mdev, 1), dev);
260 free_irq(macio_irq(mdev, 0), dev);
270 macio_release_resources(mdev);
275 static void mace_remove(struct macio_dev *mdev)
277 struct net_device *dev = macio_get_drvdata(mdev);
278 struct mace_data *mp;
282 macio_set_drvdata(mdev, NULL);
284 mp = netdev_priv(dev);
286 unregister_netdev(dev);
288 free_irq(dev->irq, dev);
289 free_irq(mp->tx_dma_intr, dev);
290 free_irq(mp->rx_dma_intr, dev);
298 macio_release_resources(mdev);
301 static void dbdma_reset(volatile struct dbdma_regs __iomem *dma)
305 out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16);
308 * Yes this looks peculiar, but apparently it needs to be this
309 * way on some machines.
311 for (i = 200; i > 0; --i)
312 if (le32_to_cpu(dma->control) & RUN)
316 static void mace_reset(struct net_device *dev)
318 struct mace_data *mp = netdev_priv(dev);
319 volatile struct mace __iomem *mb = mp->mace;
322 /* soft-reset the chip */
325 out_8(&mb->biucc, SWRST);
326 if (in_8(&mb->biucc) & SWRST) {
333 printk(KERN_ERR "mace: cannot reset chip!\n");
337 out_8(&mb->imr, 0xff); /* disable all intrs for now */
339 out_8(&mb->maccc, 0); /* turn off tx, rx */
341 out_8(&mb->biucc, XMTSP_64);
342 out_8(&mb->utr, RTRD);
343 out_8(&mb->fifocc, RCVFW_32 | XMTFW_16 | XMTFWU | RCVFWU | XMTBRST);
344 out_8(&mb->xmtfc, AUTO_PAD_XMIT); /* auto-pad short frames */
345 out_8(&mb->rcvfc, 0);
347 /* load up the hardware address */
348 __mace_set_address(dev, dev->dev_addr);
350 /* clear the multicast filter */
351 if (mp->chipid == BROKEN_ADDRCHG_REV)
352 out_8(&mb->iac, LOGADDR);
354 out_8(&mb->iac, ADDRCHG | LOGADDR);
355 while ((in_8(&mb->iac) & ADDRCHG) != 0)
358 for (i = 0; i < 8; ++i)
359 out_8(&mb->ladrf, 0);
361 /* done changing address */
362 if (mp->chipid != BROKEN_ADDRCHG_REV)
366 out_8(&mb->plscc, PORTSEL_AUI + ENPLSIO);
368 out_8(&mb->plscc, PORTSEL_GPSI + ENPLSIO);
371 static void __mace_set_address(struct net_device *dev, const void *addr)
373 struct mace_data *mp = netdev_priv(dev);
374 volatile struct mace __iomem *mb = mp->mace;
375 const unsigned char *p = addr;
376 u8 macaddr[ETH_ALEN];
379 /* load up the hardware address */
380 if (mp->chipid == BROKEN_ADDRCHG_REV)
381 out_8(&mb->iac, PHYADDR);
383 out_8(&mb->iac, ADDRCHG | PHYADDR);
384 while ((in_8(&mb->iac) & ADDRCHG) != 0)
387 for (i = 0; i < 6; ++i)
388 out_8(&mb->padr, macaddr[i] = p[i]);
390 eth_hw_addr_set(dev, macaddr);
392 if (mp->chipid != BROKEN_ADDRCHG_REV)
396 static int mace_set_address(struct net_device *dev, void *addr)
398 struct mace_data *mp = netdev_priv(dev);
399 volatile struct mace __iomem *mb = mp->mace;
402 spin_lock_irqsave(&mp->lock, flags);
404 __mace_set_address(dev, addr);
406 /* note: setting ADDRCHG clears ENRCV */
407 out_8(&mb->maccc, mp->maccc);
409 spin_unlock_irqrestore(&mp->lock, flags);
413 static inline void mace_clean_rings(struct mace_data *mp)
417 /* free some skb's */
418 for (i = 0; i < N_RX_RING; ++i) {
419 if (mp->rx_bufs[i] != NULL) {
420 dev_kfree_skb(mp->rx_bufs[i]);
421 mp->rx_bufs[i] = NULL;
424 for (i = mp->tx_empty; i != mp->tx_fill; ) {
425 dev_kfree_skb(mp->tx_bufs[i]);
426 if (++i >= N_TX_RING)
431 static int mace_open(struct net_device *dev)
433 struct mace_data *mp = netdev_priv(dev);
434 volatile struct mace __iomem *mb = mp->mace;
435 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
436 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
437 volatile struct dbdma_cmd *cp;
445 /* initialize list of sk_buffs for receiving and set up recv dma */
446 mace_clean_rings(mp);
447 memset((char *)mp->rx_cmds, 0, N_RX_RING * sizeof(struct dbdma_cmd));
449 for (i = 0; i < N_RX_RING - 1; ++i) {
450 skb = netdev_alloc_skb(dev, RX_BUFLEN + 2);
454 skb_reserve(skb, 2); /* so IP header lands on 4-byte bdry */
457 mp->rx_bufs[i] = skb;
458 cp->req_count = cpu_to_le16(RX_BUFLEN);
459 cp->command = cpu_to_le16(INPUT_LAST + INTR_ALWAYS);
460 cp->phy_addr = cpu_to_le32(virt_to_bus(data));
464 mp->rx_bufs[i] = NULL;
465 cp->command = cpu_to_le16(DBDMA_STOP);
469 /* Put a branch back to the beginning of the receive command list */
471 cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS);
472 cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->rx_cmds));
475 out_le32(&rd->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
476 out_le32(&rd->cmdptr, virt_to_bus(mp->rx_cmds));
477 out_le32(&rd->control, (RUN << 16) | RUN);
479 /* put a branch at the end of the tx command list */
480 cp = mp->tx_cmds + NCMDS_TX * N_TX_RING;
481 cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS);
482 cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->tx_cmds));
485 out_le32(&td->control, (RUN|PAUSE|FLUSH|WAKE) << 16);
486 out_le32(&td->cmdptr, virt_to_bus(mp->tx_cmds));
494 out_8(&mb->maccc, mp->maccc);
495 /* enable all interrupts except receive interrupts */
496 out_8(&mb->imr, RCVINT);
501 static int mace_close(struct net_device *dev)
503 struct mace_data *mp = netdev_priv(dev);
504 volatile struct mace __iomem *mb = mp->mace;
505 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
506 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
508 /* disable rx and tx */
509 out_8(&mb->maccc, 0);
510 out_8(&mb->imr, 0xff); /* disable all intrs */
512 /* disable rx and tx dma */
513 rd->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
514 td->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
516 mace_clean_rings(mp);
521 static inline void mace_set_timeout(struct net_device *dev)
523 struct mace_data *mp = netdev_priv(dev);
525 if (mp->timeout_active)
526 del_timer(&mp->tx_timeout);
527 mp->tx_timeout.expires = jiffies + TX_TIMEOUT;
528 add_timer(&mp->tx_timeout);
529 mp->timeout_active = 1;
532 static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev)
534 struct mace_data *mp = netdev_priv(dev);
535 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
536 volatile struct dbdma_cmd *cp, *np;
540 /* see if there's a free slot in the tx ring */
541 spin_lock_irqsave(&mp->lock, flags);
544 if (next >= N_TX_RING)
546 if (next == mp->tx_empty) {
547 netif_stop_queue(dev);
549 spin_unlock_irqrestore(&mp->lock, flags);
550 return NETDEV_TX_BUSY; /* can't take it at the moment */
552 spin_unlock_irqrestore(&mp->lock, flags);
554 /* partially fill in the dma command block */
556 if (len > ETH_FRAME_LEN) {
557 printk(KERN_DEBUG "mace: xmit frame too long (%d)\n", len);
560 mp->tx_bufs[fill] = skb;
561 cp = mp->tx_cmds + NCMDS_TX * fill;
562 cp->req_count = cpu_to_le16(len);
563 cp->phy_addr = cpu_to_le32(virt_to_bus(skb->data));
565 np = mp->tx_cmds + NCMDS_TX * next;
566 out_le16(&np->command, DBDMA_STOP);
568 /* poke the tx dma channel */
569 spin_lock_irqsave(&mp->lock, flags);
571 if (!mp->tx_bad_runt && mp->tx_active < MAX_TX_ACTIVE) {
572 out_le16(&cp->xfer_status, 0);
573 out_le16(&cp->command, OUTPUT_LAST);
574 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
576 mace_set_timeout(dev);
578 if (++next >= N_TX_RING)
580 if (next == mp->tx_empty)
581 netif_stop_queue(dev);
582 spin_unlock_irqrestore(&mp->lock, flags);
587 static void mace_set_multicast(struct net_device *dev)
589 struct mace_data *mp = netdev_priv(dev);
590 volatile struct mace __iomem *mb = mp->mace;
595 spin_lock_irqsave(&mp->lock, flags);
597 if (dev->flags & IFF_PROMISC) {
600 unsigned char multicast_filter[8];
601 struct netdev_hw_addr *ha;
603 if (dev->flags & IFF_ALLMULTI) {
604 for (i = 0; i < 8; i++)
605 multicast_filter[i] = 0xff;
607 for (i = 0; i < 8; i++)
608 multicast_filter[i] = 0;
609 netdev_for_each_mc_addr(ha, dev) {
610 crc = ether_crc_le(6, ha->addr);
611 i = crc >> 26; /* bit number in multicast_filter */
612 multicast_filter[i >> 3] |= 1 << (i & 7);
616 printk("Multicast filter :");
617 for (i = 0; i < 8; i++)
618 printk("%02x ", multicast_filter[i]);
622 if (mp->chipid == BROKEN_ADDRCHG_REV)
623 out_8(&mb->iac, LOGADDR);
625 out_8(&mb->iac, ADDRCHG | LOGADDR);
626 while ((in_8(&mb->iac) & ADDRCHG) != 0)
629 for (i = 0; i < 8; ++i)
630 out_8(&mb->ladrf, multicast_filter[i]);
631 if (mp->chipid != BROKEN_ADDRCHG_REV)
635 out_8(&mb->maccc, mp->maccc);
636 spin_unlock_irqrestore(&mp->lock, flags);
639 static void mace_handle_misc_intrs(struct mace_data *mp, int intr, struct net_device *dev)
641 volatile struct mace __iomem *mb = mp->mace;
642 static int mace_babbles, mace_jabbers;
645 dev->stats.rx_missed_errors += 256;
646 dev->stats.rx_missed_errors += in_8(&mb->mpc); /* reading clears it */
648 dev->stats.rx_length_errors += 256;
649 dev->stats.rx_length_errors += in_8(&mb->rntpc); /* reading clears it */
651 ++dev->stats.tx_heartbeat_errors;
653 if (mace_babbles++ < 4)
654 printk(KERN_DEBUG "mace: babbling transmitter\n");
656 if (mace_jabbers++ < 4)
657 printk(KERN_DEBUG "mace: jabbering transceiver\n");
660 static irqreturn_t mace_interrupt(int irq, void *dev_id)
662 struct net_device *dev = (struct net_device *) dev_id;
663 struct mace_data *mp = netdev_priv(dev);
664 volatile struct mace __iomem *mb = mp->mace;
665 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
666 volatile struct dbdma_cmd *cp;
667 int intr, fs, i, stat, x;
670 /* static int mace_last_fs, mace_last_xcount; */
672 spin_lock_irqsave(&mp->lock, flags);
673 intr = in_8(&mb->ir); /* read interrupt register */
674 in_8(&mb->xmtrc); /* get retries */
675 mace_handle_misc_intrs(mp, intr, dev);
678 while (in_8(&mb->pr) & XMTSV) {
679 del_timer(&mp->tx_timeout);
680 mp->timeout_active = 0;
682 * Clear any interrupt indication associated with this status
683 * word. This appears to unlatch any error indication from
684 * the DMA controller.
686 intr = in_8(&mb->ir);
688 mace_handle_misc_intrs(mp, intr, dev);
689 if (mp->tx_bad_runt) {
690 fs = in_8(&mb->xmtfs);
692 out_8(&mb->xmtfc, AUTO_PAD_XMIT);
695 dstat = le32_to_cpu(td->status);
696 /* stop DMA controller */
697 out_le32(&td->control, RUN << 16);
699 * xcount is the number of complete frames which have been
700 * written to the fifo but for which status has not been read.
702 xcount = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK;
703 if (xcount == 0 || (dstat & DEAD)) {
705 * If a packet was aborted before the DMA controller has
706 * finished transferring it, it seems that there are 2 bytes
707 * which are stuck in some buffer somewhere. These will get
708 * transmitted as soon as we read the frame status (which
709 * reenables the transmit data transfer request). Turning
710 * off the DMA controller and/or resetting the MACE doesn't
711 * help. So we disable auto-padding and FCS transmission
712 * so the two bytes will only be a runt packet which should
713 * be ignored by other stations.
715 out_8(&mb->xmtfc, DXMTFCS);
717 fs = in_8(&mb->xmtfs);
718 if ((fs & XMTSV) == 0) {
719 printk(KERN_ERR "mace: xmtfs not valid! (fs=%x xc=%d ds=%x)\n",
723 * XXX mace likes to hang the machine after a xmtfs error.
724 * This is hard to reproduce, resetting *may* help
727 cp = mp->tx_cmds + NCMDS_TX * i;
728 stat = le16_to_cpu(cp->xfer_status);
729 if ((fs & (UFLO|LCOL|LCAR|RTRY)) || (dstat & DEAD) || xcount == 0) {
731 * Check whether there were in fact 2 bytes written to
735 x = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK;
737 /* there were two bytes with an end-of-packet indication */
739 mace_set_timeout(dev);
742 * Either there weren't the two bytes buffered up, or they
743 * didn't have an end-of-packet indication.
744 * We flush the transmit FIFO just in case (by setting the
745 * XMTFWU bit with the transmitter disabled).
747 out_8(&mb->maccc, in_8(&mb->maccc) & ~ENXMT);
748 out_8(&mb->fifocc, in_8(&mb->fifocc) | XMTFWU);
750 out_8(&mb->maccc, in_8(&mb->maccc) | ENXMT);
751 out_8(&mb->xmtfc, AUTO_PAD_XMIT);
754 /* dma should have finished */
755 if (i == mp->tx_fill) {
756 printk(KERN_DEBUG "mace: tx ring ran out? (fs=%x xc=%d ds=%x)\n",
761 if (fs & (UFLO|LCOL|LCAR|RTRY)) {
762 ++dev->stats.tx_errors;
764 ++dev->stats.tx_carrier_errors;
765 if (fs & (UFLO|LCOL|RTRY))
766 ++dev->stats.tx_aborted_errors;
768 dev->stats.tx_bytes += mp->tx_bufs[i]->len;
769 ++dev->stats.tx_packets;
771 dev_consume_skb_irq(mp->tx_bufs[i]);
773 if (++i >= N_TX_RING)
777 mace_last_xcount = xcount;
781 if (i != mp->tx_empty) {
783 netif_wake_queue(dev);
789 if (!mp->tx_bad_runt && i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE) {
791 /* set up the next one */
792 cp = mp->tx_cmds + NCMDS_TX * i;
793 out_le16(&cp->xfer_status, 0);
794 out_le16(&cp->command, OUTPUT_LAST);
796 if (++i >= N_TX_RING)
798 } while (i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE);
799 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
800 mace_set_timeout(dev);
802 spin_unlock_irqrestore(&mp->lock, flags);
806 static void mace_tx_timeout(struct timer_list *t)
808 struct mace_data *mp = from_timer(mp, t, tx_timeout);
809 struct net_device *dev = macio_get_drvdata(mp->mdev);
810 volatile struct mace __iomem *mb = mp->mace;
811 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
812 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
813 volatile struct dbdma_cmd *cp;
817 spin_lock_irqsave(&mp->lock, flags);
818 mp->timeout_active = 0;
819 if (mp->tx_active == 0 && !mp->tx_bad_runt)
822 /* update various counters */
823 mace_handle_misc_intrs(mp, in_8(&mb->ir), dev);
825 cp = mp->tx_cmds + NCMDS_TX * mp->tx_empty;
827 /* turn off both tx and rx and reset the chip */
828 out_8(&mb->maccc, 0);
829 printk(KERN_ERR "mace: transmit timeout - resetting\n");
834 cp = bus_to_virt(le32_to_cpu(rd->cmdptr));
836 out_le16(&cp->xfer_status, 0);
837 out_le32(&rd->cmdptr, virt_to_bus(cp));
838 out_le32(&rd->control, (RUN << 16) | RUN);
840 /* fix up the transmit side */
843 ++dev->stats.tx_errors;
844 if (mp->tx_bad_runt) {
846 } else if (i != mp->tx_fill) {
847 dev_kfree_skb_irq(mp->tx_bufs[i]);
848 if (++i >= N_TX_RING)
853 netif_wake_queue(dev);
854 if (i != mp->tx_fill) {
855 cp = mp->tx_cmds + NCMDS_TX * i;
856 out_le16(&cp->xfer_status, 0);
857 out_le16(&cp->command, OUTPUT_LAST);
858 out_le32(&td->cmdptr, virt_to_bus(cp));
859 out_le32(&td->control, (RUN << 16) | RUN);
861 mace_set_timeout(dev);
864 /* turn it back on */
865 out_8(&mb->imr, RCVINT);
866 out_8(&mb->maccc, mp->maccc);
869 spin_unlock_irqrestore(&mp->lock, flags);
872 static irqreturn_t mace_txdma_intr(int irq, void *dev_id)
877 static irqreturn_t mace_rxdma_intr(int irq, void *dev_id)
879 struct net_device *dev = (struct net_device *) dev_id;
880 struct mace_data *mp = netdev_priv(dev);
881 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
882 volatile struct dbdma_cmd *cp, *np;
883 int i, nb, stat, next;
885 unsigned frame_status;
886 static int mace_lost_status;
890 spin_lock_irqsave(&mp->lock, flags);
891 for (i = mp->rx_empty; i != mp->rx_fill; ) {
892 cp = mp->rx_cmds + i;
893 stat = le16_to_cpu(cp->xfer_status);
894 if ((stat & ACTIVE) == 0) {
896 if (next >= N_RX_RING)
898 np = mp->rx_cmds + next;
899 if (next != mp->rx_fill &&
900 (le16_to_cpu(np->xfer_status) & ACTIVE) != 0) {
901 printk(KERN_DEBUG "mace: lost a status word\n");
906 nb = le16_to_cpu(cp->req_count) - le16_to_cpu(cp->res_count);
907 out_le16(&cp->command, DBDMA_STOP);
908 /* got a packet, have a look at it */
909 skb = mp->rx_bufs[i];
911 ++dev->stats.rx_dropped;
914 frame_status = (data[nb-3] << 8) + data[nb-4];
915 if (frame_status & (RS_OFLO|RS_CLSN|RS_FRAMERR|RS_FCSERR)) {
916 ++dev->stats.rx_errors;
917 if (frame_status & RS_OFLO)
918 ++dev->stats.rx_over_errors;
919 if (frame_status & RS_FRAMERR)
920 ++dev->stats.rx_frame_errors;
921 if (frame_status & RS_FCSERR)
922 ++dev->stats.rx_crc_errors;
924 /* Mace feature AUTO_STRIP_RCV is on by default, dropping the
925 * FCS on frames with 802.3 headers. This means that Ethernet
926 * frames have 8 extra octets at the end, while 802.3 frames
927 * have only 4. We need to correctly account for this. */
928 if (*(unsigned short *)(data+12) < 1536) /* 802.3 header */
930 else /* Ethernet header; mace includes FCS */
933 skb->protocol = eth_type_trans(skb, dev);
934 dev->stats.rx_bytes += skb->len;
936 mp->rx_bufs[i] = NULL;
937 ++dev->stats.rx_packets;
940 ++dev->stats.rx_errors;
941 ++dev->stats.rx_length_errors;
944 /* advance to next */
945 if (++i >= N_RX_RING)
953 if (next >= N_RX_RING)
955 if (next == mp->rx_empty)
957 cp = mp->rx_cmds + i;
958 skb = mp->rx_bufs[i];
960 skb = netdev_alloc_skb(dev, RX_BUFLEN + 2);
963 mp->rx_bufs[i] = skb;
966 cp->req_count = cpu_to_le16(RX_BUFLEN);
967 data = skb? skb->data: dummy_buf;
968 cp->phy_addr = cpu_to_le32(virt_to_bus(data));
969 out_le16(&cp->xfer_status, 0);
970 out_le16(&cp->command, INPUT_LAST + INTR_ALWAYS);
972 if ((le32_to_cpu(rd->status) & ACTIVE) != 0) {
973 out_le32(&rd->control, (PAUSE << 16) | PAUSE);
974 while ((in_le32(&rd->status) & ACTIVE) != 0)
980 if (i != mp->rx_fill) {
981 out_le32(&rd->control, ((RUN|WAKE) << 16) | (RUN|WAKE));
984 spin_unlock_irqrestore(&mp->lock, flags);
988 static const struct of_device_id mace_match[] =
995 MODULE_DEVICE_TABLE (of, mace_match);
997 static struct macio_driver mace_driver =
1001 .owner = THIS_MODULE,
1002 .of_match_table = mace_match,
1004 .probe = mace_probe,
1005 .remove = mace_remove,
1009 static int __init mace_init(void)
1011 return macio_register_driver(&mace_driver);
1014 static void __exit mace_cleanup(void)
1016 macio_unregister_driver(&mace_driver);
1022 MODULE_AUTHOR("Paul Mackerras");
1023 MODULE_DESCRIPTION("PowerMac MACE driver.");
1024 module_param(port_aaui, int, 0);
1025 MODULE_PARM_DESC(port_aaui, "MACE uses AAUI port (0-1)");
1026 MODULE_LICENSE("GPL");
1028 module_init(mace_init);
1029 module_exit(mace_cleanup);