2 * linux/drivers/net/am79c961.c
4 * by Russell King <rmk@arm.linux.org.uk> 1995-2001.
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.
10 * Derived from various things including skeleton.c
12 * This is a special driver for the am79c961A Lance chip used in the
13 * Intel (formally Digital Equipment Corp) EBSA110 platform. Please
14 * note that this can not be built as a module (it doesn't make sense).
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/interrupt.h>
19 #include <linux/ioport.h>
20 #include <linux/slab.h>
21 #include <linux/string.h>
22 #include <linux/errno.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/crc32.h>
28 #include <linux/bitops.h>
30 #include <asm/system.h>
32 #include <asm/hardware.h>
38 #include "am79c961a.h"
41 am79c961_interrupt (int irq, void *dev_id, struct pt_regs *regs);
43 static unsigned int net_debug = NET_DEBUG;
45 static const char version[] =
46 "am79c961 ethernet driver (C) 1995-2001 Russell King v0.04\n";
48 /* --------------------------------------------------------------------------- */
51 static void write_rreg(u_long base, u_int reg, u_int val)
54 "str%?h %1, [%2] @ NET_RAP\n\t"
55 "str%?h %0, [%2, #-4] @ NET_RDP"
57 : "r" (val), "r" (reg), "r" (ISAIO_BASE + 0x0464));
60 static inline unsigned short read_rreg(u_long base_addr, u_int reg)
64 "str%?h %1, [%2] @ NET_RAP\n\t"
65 "ldr%?h %0, [%2, #-4] @ NET_RDP"
67 : "r" (reg), "r" (ISAIO_BASE + 0x0464));
71 static inline void write_ireg(u_long base, u_int reg, u_int val)
74 "str%?h %1, [%2] @ NET_RAP\n\t"
75 "str%?h %0, [%2, #8] @ NET_IDP"
77 : "r" (val), "r" (reg), "r" (ISAIO_BASE + 0x0464));
80 static inline unsigned short read_ireg(u_long base_addr, u_int reg)
84 "str%?h %1, [%2] @ NAT_RAP\n\t"
85 "ldr%?h %0, [%2, #8] @ NET_IDP\n\t"
87 : "r" (reg), "r" (ISAIO_BASE + 0x0464));
91 #define am_writeword(dev,off,val) __raw_writew(val, ISAMEM_BASE + ((off) << 1))
92 #define am_readword(dev,off) __raw_readw(ISAMEM_BASE + ((off) << 1))
95 am_writebuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
97 offset = ISAMEM_BASE + (offset << 1);
98 length = (length + 1) & ~1;
100 __asm__ __volatile__("str%?h %2, [%0], #4"
101 : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
106 unsigned int tmp, tmp2;
107 __asm__ __volatile__(
108 "ldm%?ia %1!, {%2, %3}\n\t"
109 "str%?h %2, [%0], #4\n\t"
110 "mov%? %2, %2, lsr #16\n\t"
111 "str%?h %2, [%0], #4\n\t"
112 "str%?h %3, [%0], #4\n\t"
113 "mov%? %3, %3, lsr #16\n\t"
114 "str%?h %3, [%0], #4"
115 : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2)
116 : "0" (offset), "1" (buf));
120 __asm__ __volatile__("str%?h %2, [%0], #4"
121 : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
128 am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
130 offset = ISAMEM_BASE + (offset << 1);
131 length = (length + 1) & ~1;
134 __asm__ __volatile__(
135 "ldr%?h %2, [%0], #4\n\t"
136 "str%?b %2, [%1], #1\n\t"
137 "mov%? %2, %2, lsr #8\n\t"
138 "str%?b %2, [%1], #1"
139 : "=&r" (offset), "=&r" (buf), "=r" (tmp): "0" (offset), "1" (buf));
143 unsigned int tmp, tmp2, tmp3;
144 __asm__ __volatile__(
145 "ldr%?h %2, [%0], #4\n\t"
146 "ldr%?h %3, [%0], #4\n\t"
147 "orr%? %2, %2, %3, lsl #16\n\t"
148 "ldr%?h %3, [%0], #4\n\t"
149 "ldr%?h %4, [%0], #4\n\t"
150 "orr%? %3, %3, %4, lsl #16\n\t"
151 "stm%?ia %1!, {%2, %3}"
152 : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2), "=r" (tmp3)
153 : "0" (offset), "1" (buf));
158 __asm__ __volatile__(
159 "ldr%?h %2, [%0], #4\n\t"
160 "str%?b %2, [%1], #1\n\t"
161 "mov%? %2, %2, lsr #8\n\t"
162 "str%?b %2, [%1], #1"
163 : "=&r" (offset), "=&r" (buf), "=r" (tmp) : "0" (offset), "1" (buf));
168 #error Not compatible
172 am79c961_ramtest(struct net_device *dev, unsigned int val)
174 unsigned char *buffer = kmalloc (65536, GFP_KERNEL);
175 int i, error = 0, errorcount = 0;
179 memset (buffer, val, 65536);
180 am_writebuffer(dev, 0, buffer, 65536);
181 memset (buffer, val ^ 255, 65536);
182 am_readbuffer(dev, 0, buffer, 65536);
183 for (i = 0; i < 65536; i++) {
184 if (buffer[i] != val && !error) {
185 printk ("%s: buffer error (%02X %02X) %05X - ", dev->name, val, buffer[i], i);
188 } else if (error && buffer[i] == val) {
189 printk ("%05X\n", i);
200 am79c961_init_for_open(struct net_device *dev)
202 struct dev_priv *priv = netdev_priv(dev);
205 u_int hdr_addr, first_free_addr;
211 spin_lock_irqsave(priv->chip_lock, flags);
212 write_rreg (dev->base_addr, CSR0, CSR0_BABL|CSR0_CERR|CSR0_MISS|CSR0_MERR|CSR0_TINT|CSR0_RINT|CSR0_STOP);
213 spin_unlock_irqrestore(priv->chip_lock, flags);
215 write_ireg (dev->base_addr, 5, 0x00a0); /* Receive address LED */
216 write_ireg (dev->base_addr, 6, 0x0081); /* Collision LED */
217 write_ireg (dev->base_addr, 7, 0x0090); /* XMIT LED */
218 write_ireg (dev->base_addr, 2, 0x0000); /* MODE register selects media */
220 for (i = LADRL; i <= LADRH; i++)
221 write_rreg (dev->base_addr, i, 0);
223 for (i = PADRL, p = dev->dev_addr; i <= PADRH; i++, p += 2)
224 write_rreg (dev->base_addr, i, p[0] | (p[1] << 8));
227 if (dev->flags & IFF_PROMISC)
230 write_rreg (dev->base_addr, MODE, i);
231 write_rreg (dev->base_addr, POLLINT, 0);
232 write_rreg (dev->base_addr, SIZERXR, -RX_BUFFERS);
233 write_rreg (dev->base_addr, SIZETXR, -TX_BUFFERS);
235 first_free_addr = RX_BUFFERS * 8 + TX_BUFFERS * 8 + 16;
240 priv->rxhdr = hdr_addr;
242 for (i = 0; i < RX_BUFFERS; i++) {
243 priv->rxbuffer[i] = first_free_addr;
244 am_writeword (dev, hdr_addr, first_free_addr);
245 am_writeword (dev, hdr_addr + 2, RMD_OWN);
246 am_writeword (dev, hdr_addr + 4, (-1600));
247 am_writeword (dev, hdr_addr + 6, 0);
248 first_free_addr += 1600;
253 priv->txhdr = hdr_addr;
254 for (i = 0; i < TX_BUFFERS; i++) {
255 priv->txbuffer[i] = first_free_addr;
256 am_writeword (dev, hdr_addr, first_free_addr);
257 am_writeword (dev, hdr_addr + 2, TMD_STP|TMD_ENP);
258 am_writeword (dev, hdr_addr + 4, 0xf000);
259 am_writeword (dev, hdr_addr + 6, 0);
260 first_free_addr += 1600;
264 write_rreg (dev->base_addr, BASERXL, priv->rxhdr);
265 write_rreg (dev->base_addr, BASERXH, 0);
266 write_rreg (dev->base_addr, BASETXL, priv->txhdr);
267 write_rreg (dev->base_addr, BASERXH, 0);
268 write_rreg (dev->base_addr, CSR0, CSR0_STOP);
269 write_rreg (dev->base_addr, CSR3, CSR3_IDONM|CSR3_BABLM|CSR3_DXSUFLO);
270 write_rreg (dev->base_addr, CSR4, CSR4_APAD_XMIT|CSR4_MFCOM|CSR4_RCVCCOM|CSR4_TXSTRTM|CSR4_JABM);
271 write_rreg (dev->base_addr, CSR0, CSR0_IENA|CSR0_STRT);
274 static void am79c961_timer(unsigned long data)
276 struct net_device *dev = (struct net_device *)data;
277 struct dev_priv *priv = netdev_priv(dev);
278 unsigned int lnkstat, carrier;
280 lnkstat = read_ireg(dev->base_addr, ISALED0) & ISALED0_LNKST;
281 carrier = netif_carrier_ok(dev);
283 if (lnkstat && !carrier)
284 netif_carrier_on(dev);
285 else if (!lnkstat && carrier)
286 netif_carrier_off(dev);
288 mod_timer(&priv->timer, jiffies + msecs_to_jiffies(500));
292 * Open/initialize the board.
295 am79c961_open(struct net_device *dev)
297 struct dev_priv *priv = netdev_priv(dev);
300 memset (&priv->stats, 0, sizeof (priv->stats));
302 ret = request_irq(dev->irq, am79c961_interrupt, 0, dev->name, dev);
306 am79c961_init_for_open(dev);
308 netif_carrier_off(dev);
310 priv->timer.expires = jiffies;
311 add_timer(&priv->timer);
313 netif_start_queue(dev);
319 * The inverse routine to am79c961_open().
322 am79c961_close(struct net_device *dev)
324 struct dev_priv *priv = netdev_priv(dev);
327 del_timer_sync(&priv->timer);
329 netif_stop_queue(dev);
330 netif_carrier_off(dev);
332 spin_lock_irqsave(priv->chip_lock, flags);
333 write_rreg (dev->base_addr, CSR0, CSR0_STOP);
334 write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
335 spin_unlock_irqrestore(priv->chip_lock, flags);
337 free_irq (dev->irq, dev);
343 * Get the current statistics.
345 static struct net_device_stats *am79c961_getstats (struct net_device *dev)
347 struct dev_priv *priv = netdev_priv(dev);
351 static void am79c961_mc_hash(struct dev_mc_list *dmi, unsigned short *hash)
353 if (dmi->dmi_addrlen == ETH_ALEN && dmi->dmi_addr[0] & 0x01) {
357 crc = ether_crc_le(ETH_ALEN, dmi->dmi_addr);
360 bit = (crc >> 26) & 15;
362 hash[idx] |= 1 << bit;
367 * Set or clear promiscuous/multicast mode filter for this adapter.
369 static void am79c961_setmulticastlist (struct net_device *dev)
371 struct dev_priv *priv = netdev_priv(dev);
373 unsigned short multi_hash[4], mode;
376 mode = MODE_PORT_10BT;
378 if (dev->flags & IFF_PROMISC) {
379 mode |= MODE_PROMISC;
380 } else if (dev->flags & IFF_ALLMULTI) {
381 memset(multi_hash, 0xff, sizeof(multi_hash));
383 struct dev_mc_list *dmi;
385 memset(multi_hash, 0x00, sizeof(multi_hash));
387 for (dmi = dev->mc_list; dmi; dmi = dmi->next)
388 am79c961_mc_hash(dmi, multi_hash);
391 spin_lock_irqsave(priv->chip_lock, flags);
393 stopped = read_rreg(dev->base_addr, CSR0) & CSR0_STOP;
397 * Put the chip into suspend mode
399 write_rreg(dev->base_addr, CTRL1, CTRL1_SPND);
402 * Spin waiting for chip to report suspend mode
404 while ((read_rreg(dev->base_addr, CTRL1) & CTRL1_SPND) == 0) {
405 spin_unlock_irqrestore(priv->chip_lock, flags);
407 spin_lock_irqsave(priv->chip_lock, flags);
412 * Update the multicast hash table
414 for (i = 0; i < sizeof(multi_hash) / sizeof(multi_hash[0]); i++)
415 write_rreg(dev->base_addr, i + LADRL, multi_hash[i]);
418 * Write the mode register
420 write_rreg(dev->base_addr, MODE, mode);
424 * Put the chip back into running mode
426 write_rreg(dev->base_addr, CTRL1, 0);
429 spin_unlock_irqrestore(priv->chip_lock, flags);
432 static void am79c961_timeout(struct net_device *dev)
434 printk(KERN_WARNING "%s: transmit timed out, network cable problem?\n",
438 * ought to do some setup of the tx side here
441 netif_wake_queue(dev);
448 am79c961_sendpacket(struct sk_buff *skb, struct net_device *dev)
450 struct dev_priv *priv = netdev_priv(dev);
451 unsigned int hdraddr, bufaddr;
456 hdraddr = priv->txhdr + (head << 3);
457 bufaddr = priv->txbuffer[head];
459 if (head >= TX_BUFFERS)
462 am_writebuffer (dev, bufaddr, skb->data, skb->len);
463 am_writeword (dev, hdraddr + 4, -skb->len);
464 am_writeword (dev, hdraddr + 2, TMD_OWN|TMD_STP|TMD_ENP);
467 spin_lock_irqsave(priv->chip_lock, flags);
468 write_rreg (dev->base_addr, CSR0, CSR0_TDMD|CSR0_IENA);
469 dev->trans_start = jiffies;
470 spin_unlock_irqrestore(priv->chip_lock, flags);
473 * If the next packet is owned by the ethernet device,
474 * then the tx ring is full and we can't add another
477 if (am_readword(dev, priv->txhdr + (priv->txhead << 3) + 2) & TMD_OWN)
478 netif_stop_queue(dev);
486 * If we have a good packet(s), get it/them out of the buffers.
489 am79c961_rx(struct net_device *dev, struct dev_priv *priv)
498 hdraddr = priv->rxhdr + (priv->rxtail << 3);
499 pktaddr = priv->rxbuffer[priv->rxtail];
501 status = am_readword (dev, hdraddr + 2);
502 if (status & RMD_OWN) /* do we own it? */
506 if (priv->rxtail >= RX_BUFFERS)
509 if ((status & (RMD_ERR|RMD_STP|RMD_ENP)) != (RMD_STP|RMD_ENP)) {
510 am_writeword (dev, hdraddr + 2, RMD_OWN);
511 priv->stats.rx_errors ++;
512 if (status & RMD_ERR) {
513 if (status & RMD_FRAM)
514 priv->stats.rx_frame_errors ++;
515 if (status & RMD_CRC)
516 priv->stats.rx_crc_errors ++;
517 } else if (status & RMD_STP)
518 priv->stats.rx_length_errors ++;
522 len = am_readword(dev, hdraddr + 6);
523 skb = dev_alloc_skb(len + 2);
529 am_readbuffer(dev, pktaddr, skb_put(skb, len), len);
530 am_writeword(dev, hdraddr + 2, RMD_OWN);
531 skb->protocol = eth_type_trans(skb, dev);
533 dev->last_rx = jiffies;
534 priv->stats.rx_bytes += len;
535 priv->stats.rx_packets ++;
537 am_writeword (dev, hdraddr + 2, RMD_OWN);
538 printk (KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name);
539 priv->stats.rx_dropped ++;
546 * Update stats for the transmitted packet
549 am79c961_tx(struct net_device *dev, struct dev_priv *priv)
556 hdraddr = priv->txhdr + (priv->txtail << 3);
557 status = am_readword (dev, hdraddr + 2);
558 if (status & TMD_OWN)
562 if (priv->txtail >= TX_BUFFERS)
565 if (status & TMD_ERR) {
568 priv->stats.tx_errors ++;
570 status2 = am_readword (dev, hdraddr + 6);
573 * Clear the error byte
575 am_writeword (dev, hdraddr + 6, 0);
577 if (status2 & TST_RTRY)
578 priv->stats.collisions += 16;
579 if (status2 & TST_LCOL)
580 priv->stats.tx_window_errors ++;
581 if (status2 & TST_LCAR)
582 priv->stats.tx_carrier_errors ++;
583 if (status2 & TST_UFLO)
584 priv->stats.tx_fifo_errors ++;
587 priv->stats.tx_packets ++;
588 len = am_readword (dev, hdraddr + 4);
589 priv->stats.tx_bytes += -len;
590 } while (priv->txtail != priv->txhead);
592 netif_wake_queue(dev);
596 am79c961_interrupt(int irq, void *dev_id, struct pt_regs *regs)
598 struct net_device *dev = (struct net_device *)dev_id;
599 struct dev_priv *priv = netdev_priv(dev);
600 u_int status, n = 100;
604 status = read_rreg(dev->base_addr, CSR0);
605 write_rreg(dev->base_addr, CSR0, status &
606 (CSR0_IENA|CSR0_TINT|CSR0_RINT|
607 CSR0_MERR|CSR0_MISS|CSR0_CERR|CSR0_BABL));
609 if (status & CSR0_RINT) {
611 am79c961_rx(dev, priv);
613 if (status & CSR0_TINT) {
615 am79c961_tx(dev, priv);
617 if (status & CSR0_MISS) {
619 priv->stats.rx_dropped ++;
621 if (status & CSR0_CERR) {
623 mod_timer(&priv->timer, jiffies);
625 } while (--n && status & (CSR0_RINT | CSR0_TINT));
627 return IRQ_RETVAL(handled);
630 #ifdef CONFIG_NET_POLL_CONTROLLER
631 static void am79c961_poll_controller(struct net_device *dev)
634 local_irq_save(flags);
635 am79c961_interrupt(dev->irq, dev, NULL);
636 local_irq_restore(flags);
641 * Initialise the chip. Note that we always expect
642 * to be entered with interrupts enabled.
645 am79c961_hw_init(struct net_device *dev)
647 struct dev_priv *priv = netdev_priv(dev);
649 spin_lock_irq(&priv->chip_lock);
650 write_rreg (dev->base_addr, CSR0, CSR0_STOP);
651 write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
652 spin_unlock_irq(&priv->chip_lock);
654 am79c961_ramtest(dev, 0x66);
655 am79c961_ramtest(dev, 0x99);
660 static void __init am79c961_banner(void)
662 static unsigned version_printed;
664 if (net_debug && version_printed++ == 0)
665 printk(KERN_INFO "%s", version);
668 static int __init am79c961_init(void)
670 struct net_device *dev;
671 struct dev_priv *priv;
674 dev = alloc_etherdev(sizeof(struct dev_priv));
679 priv = netdev_priv(dev);
682 * Fixed address and IRQ lines here.
683 * The PNP initialisation should have been
684 * done by the ether bootp loader.
686 dev->base_addr = 0x220;
687 dev->irq = IRQ_EBSA110_ETHERNET;
690 if (!request_region(dev->base_addr, 0x18, dev->name))
696 inb(dev->base_addr + NET_RESET);
700 * Check the manufacturer part of the
703 if (inb(dev->base_addr) != 0x08 ||
704 inb(dev->base_addr + 2) != 0x00 ||
705 inb(dev->base_addr + 4) != 0x2b)
710 for (i = 0; i < 6; i++)
711 dev->dev_addr[i] = inb(dev->base_addr + i * 2) & 0xff;
713 spin_lock_init(&priv->chip_lock);
714 init_timer(&priv->timer);
715 priv->timer.data = (unsigned long)dev;
716 priv->timer.function = am79c961_timer;
718 if (am79c961_hw_init(dev))
721 dev->open = am79c961_open;
722 dev->stop = am79c961_close;
723 dev->hard_start_xmit = am79c961_sendpacket;
724 dev->get_stats = am79c961_getstats;
725 dev->set_multicast_list = am79c961_setmulticastlist;
726 dev->tx_timeout = am79c961_timeout;
727 #ifdef CONFIG_NET_POLL_CONTROLLER
728 dev->poll_controller = am79c961_poll_controller;
731 ret = register_netdev(dev);
733 printk(KERN_INFO "%s: ether address ", dev->name);
735 for (i = 0; i < 6; i++)
736 printk (i == 5 ? "%02x\n" : "%02x:", dev->dev_addr[i]);
742 release_region(dev->base_addr, 0x18);
749 __initcall(am79c961_init);