2 * Driver for the Macintosh 68K onboard MACE controller with PSC
3 * driven DMA. The MACE driver code is derived from mace.c. The
4 * Mac68k theory of operation is courtesy of the MacBSD wizards.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
11 * Copyright (C) 1996 Paul Mackerras.
12 * Copyright (C) 1998 Alan Cox <alan@redhat.com>
14 * Modified heavily by Joshua M. Thompson based on Dave Huang's NetBSD driver
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/netdevice.h>
21 #include <linux/etherdevice.h>
22 #include <linux/delay.h>
23 #include <linux/string.h>
24 #include <linux/crc32.h>
26 #include <asm/pgtable.h>
28 #include <asm/macintosh.h>
29 #include <asm/macints.h>
30 #include <asm/mac_psc.h>
36 #define N_RX_PAGES ((N_RX_RING * 0x0800 + PAGE_SIZE - 1) / PAGE_SIZE)
39 /* Bits in transmit DMA status */
40 #define TX_DMA_ERR 0x80
42 /* The MACE is simply wired down on a Mac68K box */
44 #define MACE_BASE (void *)(0x50F1C000)
45 #define MACE_PROM (void *)(0x50F08001)
48 volatile struct mace *mace;
49 volatile unsigned char *tx_ring;
50 volatile unsigned char *tx_ring_phys;
51 volatile unsigned char *rx_ring;
52 volatile unsigned char *rx_ring_phys;
54 struct net_device_stats stats;
56 int tx_slot, tx_sloti, tx_count;
67 /* And frame continues.. */
70 #define PRIV_BYTES sizeof(struct mace_data)
72 extern void psc_debug_dump(void);
74 static int mace_open(struct net_device *dev);
75 static int mace_close(struct net_device *dev);
76 static int mace_xmit_start(struct sk_buff *skb, struct net_device *dev);
77 static struct net_device_stats *mace_stats(struct net_device *dev);
78 static void mace_set_multicast(struct net_device *dev);
79 static int mace_set_address(struct net_device *dev, void *addr);
80 static irqreturn_t mace_interrupt(int irq, void *dev_id);
81 static irqreturn_t mace_dma_intr(int irq, void *dev_id);
82 static void mace_tx_timeout(struct net_device *dev);
84 /* Bit-reverse one byte of an ethernet hardware address. */
86 static int bitrev(int b)
90 for (i = 0; i < 8; ++i, b >>= 1) {
91 d = (d << 1) | (b & 1);
98 * Load a receive DMA channel with a base address and ring length
101 static void mace_load_rxdma_base(struct net_device *dev, int set)
103 struct mace_data *mp = (struct mace_data *) dev->priv;
105 psc_write_word(PSC_ENETRD_CMD + set, 0x0100);
106 psc_write_long(PSC_ENETRD_ADDR + set, (u32) mp->rx_ring_phys);
107 psc_write_long(PSC_ENETRD_LEN + set, N_RX_RING);
108 psc_write_word(PSC_ENETRD_CMD + set, 0x9800);
113 * Reset the receive DMA subsystem
116 static void mace_rxdma_reset(struct net_device *dev)
118 struct mace_data *mp = (struct mace_data *) dev->priv;
119 volatile struct mace *mace = mp->mace;
120 u8 maccc = mace->maccc;
122 mace->maccc = maccc & ~ENRCV;
124 psc_write_word(PSC_ENETRD_CTL, 0x8800);
125 mace_load_rxdma_base(dev, 0x00);
126 psc_write_word(PSC_ENETRD_CTL, 0x0400);
128 psc_write_word(PSC_ENETRD_CTL, 0x8800);
129 mace_load_rxdma_base(dev, 0x10);
130 psc_write_word(PSC_ENETRD_CTL, 0x0400);
135 psc_write_word(PSC_ENETRD_CMD + PSC_SET0, 0x9800);
136 psc_write_word(PSC_ENETRD_CMD + PSC_SET1, 0x9800);
140 * Reset the transmit DMA subsystem
143 static void mace_txdma_reset(struct net_device *dev)
145 struct mace_data *mp = (struct mace_data *) dev->priv;
146 volatile struct mace *mace = mp->mace;
149 psc_write_word(PSC_ENETWR_CTL, 0x8800);
152 mace->maccc = maccc & ~ENXMT;
154 mp->tx_slot = mp->tx_sloti = 0;
155 mp->tx_count = N_TX_RING;
157 psc_write_word(PSC_ENETWR_CTL, 0x0400);
165 static void mace_dma_off(struct net_device *dev)
167 psc_write_word(PSC_ENETRD_CTL, 0x8800);
168 psc_write_word(PSC_ENETRD_CTL, 0x1000);
169 psc_write_word(PSC_ENETRD_CMD + PSC_SET0, 0x1100);
170 psc_write_word(PSC_ENETRD_CMD + PSC_SET1, 0x1100);
172 psc_write_word(PSC_ENETWR_CTL, 0x8800);
173 psc_write_word(PSC_ENETWR_CTL, 0x1000);
174 psc_write_word(PSC_ENETWR_CMD + PSC_SET0, 0x1100);
175 psc_write_word(PSC_ENETWR_CMD + PSC_SET1, 0x1100);
179 * Not really much of a probe. The hardware table tells us if this
180 * model of Macintrash has a MACE (AV macintoshes)
183 struct net_device *mace_probe(int unit)
186 struct mace_data *mp;
188 struct net_device *dev;
189 unsigned char checksum = 0;
190 static int found = 0;
193 if (found || macintosh_config->ether_type != MAC_ETHER_MACE)
194 return ERR_PTR(-ENODEV);
196 found = 1; /* prevent 'finding' one on every device probe */
198 dev = alloc_etherdev(PRIV_BYTES);
200 return ERR_PTR(-ENOMEM);
203 sprintf(dev->name, "eth%d", unit);
205 mp = (struct mace_data *) dev->priv;
206 dev->base_addr = (u32)MACE_BASE;
207 mp->mace = (volatile struct mace *) MACE_BASE;
209 dev->irq = IRQ_MAC_MACE;
210 mp->dma_intr = IRQ_MAC_MACE_DMA;
213 * The PROM contains 8 bytes which total 0xFF when XOR'd
214 * together. Due to the usual peculiar apple brain damage
215 * the bytes are spaced out in a strange boundary and the
219 addr = (void *)MACE_PROM;
221 for (j = 0; j < 6; ++j) {
222 u8 v=bitrev(addr[j<<4]);
224 dev->dev_addr[j] = v;
227 checksum ^= bitrev(addr[j<<4]);
230 if (checksum != 0xFF) {
232 return ERR_PTR(-ENODEV);
235 memset(&mp->stats, 0, sizeof(mp->stats));
237 dev->open = mace_open;
238 dev->stop = mace_close;
239 dev->hard_start_xmit = mace_xmit_start;
240 dev->tx_timeout = mace_tx_timeout;
241 dev->watchdog_timeo = TX_TIMEOUT;
242 dev->get_stats = mace_stats;
243 dev->set_multicast_list = mace_set_multicast;
244 dev->set_mac_address = mace_set_address;
246 printk(KERN_INFO "%s: 68K MACE, hardware address %.2X", dev->name, dev->dev_addr[0]);
247 for (j = 1 ; j < 6 ; j++) printk(":%.2X", dev->dev_addr[j]);
250 err = register_netdev(dev);
259 * Load the address on a mace controller.
262 static int mace_set_address(struct net_device *dev, void *addr)
264 unsigned char *p = addr;
265 struct mace_data *mp = (struct mace_data *) dev->priv;
266 volatile struct mace *mb = mp->mace;
271 local_irq_save(flags);
275 /* load up the hardware address */
276 mb->iac = ADDRCHG | PHYADDR;
277 while ((mb->iac & ADDRCHG) != 0);
279 for (i = 0; i < 6; ++i) {
280 mb->padr = dev->dev_addr[i] = p[i];
284 local_irq_restore(flags);
290 * Open the Macintosh MACE. Most of this is playing with the DMA
291 * engine. The ethernet chip is quite friendly.
294 static int mace_open(struct net_device *dev)
296 struct mace_data *mp = (struct mace_data *) dev->priv;
297 volatile struct mace *mb = mp->mace;
304 if (mb->biucc & SWRST) {
311 printk(KERN_ERR "%s: software reset failed!!\n", dev->name);
316 mb->biucc = XMTSP_64;
317 mb->fifocc = XMTFW_16 | RCVFW_64 | XMTFWU | RCVFWU | XMTBRST | RCVBRST;
318 mb->xmtfc = AUTO_PAD_XMIT;
319 mb->plscc = PORTSEL_AUI;
320 /* mb->utr = RTRD; */
322 if (request_irq(dev->irq, mace_interrupt, 0, dev->name, dev)) {
323 printk(KERN_ERR "%s: can't get irq %d\n", dev->name, dev->irq);
326 if (request_irq(mp->dma_intr, mace_dma_intr, 0, dev->name, dev)) {
327 printk(KERN_ERR "%s: can't get irq %d\n", dev->name, mp->dma_intr);
328 free_irq(dev->irq, dev);
332 /* Allocate the DMA ring buffers */
334 mp->rx_ring = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, N_RX_PAGES);
335 mp->tx_ring = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, 0);
337 if (mp->tx_ring==NULL || mp->rx_ring==NULL) {
338 if (mp->rx_ring) free_pages((u32) mp->rx_ring, N_RX_PAGES);
339 if (mp->tx_ring) free_pages((u32) mp->tx_ring, 0);
340 free_irq(dev->irq, dev);
341 free_irq(mp->dma_intr, dev);
342 printk(KERN_ERR "%s: unable to allocate DMA buffers\n", dev->name);
346 mp->rx_ring_phys = (unsigned char *) virt_to_bus((void *)mp->rx_ring);
347 mp->tx_ring_phys = (unsigned char *) virt_to_bus((void *)mp->tx_ring);
349 /* We want the Rx buffer to be uncached and the Tx buffer to be writethrough */
351 kernel_set_cachemode((void *)mp->rx_ring, N_RX_PAGES * PAGE_SIZE, IOMAP_NOCACHE_NONSER);
352 kernel_set_cachemode((void *)mp->tx_ring, PAGE_SIZE, IOMAP_WRITETHROUGH);
356 /* Not sure what these do */
358 psc_write_word(PSC_ENETWR_CTL, 0x9000);
359 psc_write_word(PSC_ENETRD_CTL, 0x9000);
360 psc_write_word(PSC_ENETWR_CTL, 0x0400);
361 psc_write_word(PSC_ENETRD_CTL, 0x0400);
364 /* load up the hardware address */
366 mb->iac = ADDRCHG | PHYADDR;
368 while ((mb->iac & ADDRCHG) != 0);
370 for (i = 0; i < 6; ++i)
371 mb->padr = dev->dev_addr[i];
373 /* clear the multicast filter */
374 mb->iac = ADDRCHG | LOGADDR;
376 while ((mb->iac & ADDRCHG) != 0);
378 for (i = 0; i < 8; ++i)
381 mb->plscc = PORTSEL_GPSI + ENPLSIO;
383 mb->maccc = ENXMT | ENRCV;
387 mace_rxdma_reset(dev);
388 mace_txdma_reset(dev);
394 * Shut down the mace and its interrupt channel
397 static int mace_close(struct net_device *dev)
399 struct mace_data *mp = (struct mace_data *) dev->priv;
400 volatile struct mace *mb = mp->mace;
402 mb->maccc = 0; /* disable rx and tx */
403 mb->imr = 0xFF; /* disable all irqs */
404 mace_dma_off(dev); /* disable rx and tx dma */
406 free_irq(dev->irq, dev);
407 free_irq(IRQ_MAC_MACE_DMA, dev);
409 free_pages((u32) mp->rx_ring, N_RX_PAGES);
410 free_pages((u32) mp->tx_ring, 0);
419 static int mace_xmit_start(struct sk_buff *skb, struct net_device *dev)
421 struct mace_data *mp = (struct mace_data *) dev->priv;
423 /* Stop the queue if the buffer is full */
426 netif_stop_queue(dev);
431 mp->stats.tx_packets++;
432 mp->stats.tx_bytes += skb->len;
434 /* We need to copy into our xmit buffer to take care of alignment and caching issues */
436 memcpy((void *) mp->tx_ring, skb->data, skb->len);
438 /* load the Tx DMA and fire it off */
440 psc_write_long(PSC_ENETWR_ADDR + mp->tx_slot, (u32) mp->tx_ring_phys);
441 psc_write_long(PSC_ENETWR_LEN + mp->tx_slot, skb->len);
442 psc_write_word(PSC_ENETWR_CMD + mp->tx_slot, 0x9800);
451 static struct net_device_stats *mace_stats(struct net_device *dev)
453 struct mace_data *p = (struct mace_data *) dev->priv;
457 static void mace_set_multicast(struct net_device *dev)
459 struct mace_data *mp = (struct mace_data *) dev->priv;
460 volatile struct mace *mb = mp->mace;
468 if (dev->flags & IFF_PROMISC) {
471 unsigned char multicast_filter[8];
472 struct dev_mc_list *dmi = dev->mc_list;
474 if (dev->flags & IFF_ALLMULTI) {
475 for (i = 0; i < 8; i++) {
476 multicast_filter[i] = 0xFF;
479 for (i = 0; i < 8; i++)
480 multicast_filter[i] = 0;
481 for (i = 0; i < dev->mc_count; i++) {
482 crc = ether_crc_le(6, dmi->dmi_addr);
483 j = crc >> 26; /* bit number in multicast_filter */
484 multicast_filter[j >> 3] |= 1 << (j & 7);
489 mb->iac = ADDRCHG | LOGADDR;
490 while (mb->iac & ADDRCHG);
492 for (i = 0; i < 8; ++i) {
493 mb->ladrf = multicast_filter[i];
501 * Miscellaneous interrupts are handled here. We may end up
502 * having to bash the chip on the head for bad errors
505 static void mace_handle_misc_intrs(struct mace_data *mp, int intr)
507 volatile struct mace *mb = mp->mace;
508 static int mace_babbles, mace_jabbers;
511 mp->stats.rx_missed_errors += 256;
513 mp->stats.rx_missed_errors += mb->mpc; /* reading clears it */
516 mp->stats.rx_length_errors += 256;
518 mp->stats.rx_length_errors += mb->rntpc; /* reading clears it */
521 ++mp->stats.tx_heartbeat_errors;
524 if (mace_babbles++ < 4) {
525 printk(KERN_DEBUG "mace: babbling transmitter\n");
529 if (mace_jabbers++ < 4) {
530 printk(KERN_DEBUG "mace: jabbering transceiver\n");
536 * A transmit error has occurred. (We kick the transmit side from
537 * the DMA completion)
540 static void mace_xmit_error(struct net_device *dev)
542 struct mace_data *mp = (struct mace_data *) dev->priv;
543 volatile struct mace *mb = mp->mace;
551 printk("%s: DMA underrun.\n", dev->name);
552 mp->stats.tx_errors++;
553 mp->stats.tx_fifo_errors++;
554 mace_txdma_reset(dev);
557 mp->stats.collisions++;
563 * A receive interrupt occurred.
566 static void mace_recv_interrupt(struct net_device *dev)
568 /* struct mace_data *mp = (struct mace_data *) dev->priv; */
569 // volatile struct mace *mb = mp->mace;
573 * Process the chip interrupt
576 static irqreturn_t mace_interrupt(int irq, void *dev_id)
578 struct net_device *dev = (struct net_device *) dev_id;
579 struct mace_data *mp = (struct mace_data *) dev->priv;
580 volatile struct mace *mb = mp->mace;
584 mace_handle_misc_intrs(mp, ir);
587 mace_xmit_error(dev);
590 mace_recv_interrupt(dev);
595 static void mace_tx_timeout(struct net_device *dev)
597 /* struct mace_data *mp = (struct mace_data *) dev->priv; */
598 // volatile struct mace *mb = mp->mace;
602 * Handle a newly arrived frame
605 static void mace_dma_rx_frame(struct net_device *dev, struct mace_frame *mf)
607 struct mace_data *mp = (struct mace_data *) dev->priv;
610 if (mf->status & RS_OFLO) {
611 printk("%s: fifo overflow.\n", dev->name);
612 mp->stats.rx_errors++;
613 mp->stats.rx_fifo_errors++;
615 if (mf->status&(RS_CLSN|RS_FRAMERR|RS_FCSERR))
616 mp->stats.rx_errors++;
618 if (mf->status&RS_CLSN) {
619 mp->stats.collisions++;
621 if (mf->status&RS_FRAMERR) {
622 mp->stats.rx_frame_errors++;
624 if (mf->status&RS_FCSERR) {
625 mp->stats.rx_crc_errors++;
628 skb = dev_alloc_skb(mf->len+2);
630 mp->stats.rx_dropped++;
634 memcpy(skb_put(skb, mf->len), mf->data, mf->len);
637 skb->protocol = eth_type_trans(skb, dev);
639 dev->last_rx = jiffies;
640 mp->stats.rx_packets++;
641 mp->stats.rx_bytes += mf->len;
645 * The PSC has passed us a DMA interrupt event.
648 static irqreturn_t mace_dma_intr(int irq, void *dev_id)
650 struct net_device *dev = (struct net_device *) dev_id;
651 struct mace_data *mp = (struct mace_data *) dev->priv;
656 /* Not sure what this does */
658 while ((baka = psc_read_long(PSC_MYSTERY)) != psc_read_long(PSC_MYSTERY));
659 if (!(baka & 0x60000000)) return IRQ_NONE;
662 * Process the read queue
665 status = psc_read_word(PSC_ENETRD_CTL);
667 if (status & 0x2000) {
668 mace_rxdma_reset(dev);
669 } else if (status & 0x0100) {
670 psc_write_word(PSC_ENETRD_CMD + mp->rx_slot, 0x1100);
672 left = psc_read_long(PSC_ENETRD_LEN + mp->rx_slot);
673 head = N_RX_RING - left;
675 /* Loop through the ring buffer and process new packages */
677 while (mp->rx_tail < head) {
678 mace_dma_rx_frame(dev, (struct mace_frame *) (mp->rx_ring + (mp->rx_tail * 0x0800)));
682 /* If we're out of buffers in this ring then switch to */
683 /* the other set, otherwise just reactivate this one. */
686 mace_load_rxdma_base(dev, mp->rx_slot);
689 psc_write_word(PSC_ENETRD_CMD + mp->rx_slot, 0x9800);
694 * Process the write queue
697 status = psc_read_word(PSC_ENETWR_CTL);
699 if (status & 0x2000) {
700 mace_txdma_reset(dev);
701 } else if (status & 0x0100) {
702 psc_write_word(PSC_ENETWR_CMD + mp->tx_sloti, 0x0100);
703 mp->tx_sloti ^= 0x10;
705 netif_wake_queue(dev);
710 MODULE_LICENSE("GPL");