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>
29 #include <linux/platform_device.h>
32 #include <mach/hardware.h>
33 #include <asm/system.h>
38 #include "am79c961a.h"
41 am79c961_interrupt (int irq, void *dev_id);
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 register unsigned int tmp asm("r2"), tmp2 asm("r3");
108 "ldm%?ia %0!, {%1, %2}"
109 : "+r" (buf), "=&r" (tmp), "=&r" (tmp2));
112 "str%?h %1, [%0], #4\n\t"
113 "mov%? %1, %1, lsr #16\n\t"
114 "str%?h %1, [%0], #4\n\t"
115 "str%?h %2, [%0], #4\n\t"
116 "mov%? %2, %2, lsr #16\n\t"
117 "str%?h %2, [%0], #4"
118 : "+r" (offset), "=&r" (tmp), "=&r" (tmp2));
121 asm volatile("str%?h %2, [%0], #4"
122 : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
129 am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
131 offset = ISAMEM_BASE + (offset << 1);
132 length = (length + 1) & ~1;
136 "ldr%?h %2, [%0], #4\n\t"
137 "str%?b %2, [%1], #1\n\t"
138 "mov%? %2, %2, lsr #8\n\t"
139 "str%?b %2, [%1], #1"
140 : "=&r" (offset), "=&r" (buf), "=r" (tmp): "0" (offset), "1" (buf));
144 register unsigned int tmp asm("r2"), tmp2 asm("r3"), tmp3;
146 "ldr%?h %2, [%0], #4\n\t"
147 "ldr%?h %4, [%0], #4\n\t"
148 "ldr%?h %3, [%0], #4\n\t"
149 "orr%? %2, %2, %4, lsl #16\n\t"
150 "ldr%?h %4, [%0], #4\n\t"
151 "orr%? %3, %3, %4, lsl #16\n\t"
152 "stm%?ia %1!, {%2, %3}"
153 : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2), "=r" (tmp3)
154 : "0" (offset), "1" (buf));
160 "ldr%?h %2, [%0], #4\n\t"
161 "str%?b %2, [%1], #1\n\t"
162 "mov%? %2, %2, lsr #8\n\t"
163 "str%?b %2, [%1], #1"
164 : "=&r" (offset), "=&r" (buf), "=r" (tmp) : "0" (offset), "1" (buf));
169 #error Not compatible
173 am79c961_ramtest(struct net_device *dev, unsigned int val)
175 unsigned char *buffer = kmalloc (65536, GFP_KERNEL);
176 int i, error = 0, errorcount = 0;
180 memset (buffer, val, 65536);
181 am_writebuffer(dev, 0, buffer, 65536);
182 memset (buffer, val ^ 255, 65536);
183 am_readbuffer(dev, 0, buffer, 65536);
184 for (i = 0; i < 65536; i++) {
185 if (buffer[i] != val && !error) {
186 printk ("%s: buffer error (%02X %02X) %05X - ", dev->name, val, buffer[i], i);
189 } else if (error && buffer[i] == val) {
190 printk ("%05X\n", i);
200 static void am79c961_mc_hash(char *addr, u16 *hash)
205 crc = ether_crc_le(ETH_ALEN, addr);
208 bit = (crc >> 26) & 15;
210 hash[idx] |= 1 << bit;
213 static unsigned int am79c961_get_rx_mode(struct net_device *dev, u16 *hash)
215 unsigned int mode = MODE_PORT_10BT;
217 if (dev->flags & IFF_PROMISC) {
218 mode |= MODE_PROMISC;
219 memset(hash, 0xff, 4 * sizeof(*hash));
220 } else if (dev->flags & IFF_ALLMULTI) {
221 memset(hash, 0xff, 4 * sizeof(*hash));
223 struct netdev_hw_addr *ha;
225 memset(hash, 0, 4 * sizeof(*hash));
227 netdev_for_each_mc_addr(ha, dev)
228 am79c961_mc_hash(ha->addr, hash);
235 am79c961_init_for_open(struct net_device *dev)
237 struct dev_priv *priv = netdev_priv(dev);
240 u_int hdr_addr, first_free_addr;
241 u16 multi_hash[4], mode = am79c961_get_rx_mode(dev, multi_hash);
247 spin_lock_irqsave(&priv->chip_lock, flags);
248 write_rreg (dev->base_addr, CSR0, CSR0_BABL|CSR0_CERR|CSR0_MISS|CSR0_MERR|CSR0_TINT|CSR0_RINT|CSR0_STOP);
249 spin_unlock_irqrestore(&priv->chip_lock, flags);
251 write_ireg (dev->base_addr, 5, 0x00a0); /* Receive address LED */
252 write_ireg (dev->base_addr, 6, 0x0081); /* Collision LED */
253 write_ireg (dev->base_addr, 7, 0x0090); /* XMIT LED */
254 write_ireg (dev->base_addr, 2, 0x0000); /* MODE register selects media */
256 for (i = LADRL; i <= LADRH; i++)
257 write_rreg (dev->base_addr, i, multi_hash[i - LADRL]);
259 for (i = PADRL, p = dev->dev_addr; i <= PADRH; i++, p += 2)
260 write_rreg (dev->base_addr, i, p[0] | (p[1] << 8));
262 write_rreg (dev->base_addr, MODE, mode);
263 write_rreg (dev->base_addr, POLLINT, 0);
264 write_rreg (dev->base_addr, SIZERXR, -RX_BUFFERS);
265 write_rreg (dev->base_addr, SIZETXR, -TX_BUFFERS);
267 first_free_addr = RX_BUFFERS * 8 + TX_BUFFERS * 8 + 16;
272 priv->rxhdr = hdr_addr;
274 for (i = 0; i < RX_BUFFERS; i++) {
275 priv->rxbuffer[i] = first_free_addr;
276 am_writeword (dev, hdr_addr, first_free_addr);
277 am_writeword (dev, hdr_addr + 2, RMD_OWN);
278 am_writeword (dev, hdr_addr + 4, (-1600));
279 am_writeword (dev, hdr_addr + 6, 0);
280 first_free_addr += 1600;
285 priv->txhdr = hdr_addr;
286 for (i = 0; i < TX_BUFFERS; i++) {
287 priv->txbuffer[i] = first_free_addr;
288 am_writeword (dev, hdr_addr, first_free_addr);
289 am_writeword (dev, hdr_addr + 2, TMD_STP|TMD_ENP);
290 am_writeword (dev, hdr_addr + 4, 0xf000);
291 am_writeword (dev, hdr_addr + 6, 0);
292 first_free_addr += 1600;
296 write_rreg (dev->base_addr, BASERXL, priv->rxhdr);
297 write_rreg (dev->base_addr, BASERXH, 0);
298 write_rreg (dev->base_addr, BASETXL, priv->txhdr);
299 write_rreg (dev->base_addr, BASERXH, 0);
300 write_rreg (dev->base_addr, CSR0, CSR0_STOP);
301 write_rreg (dev->base_addr, CSR3, CSR3_IDONM|CSR3_BABLM|CSR3_DXSUFLO);
302 write_rreg (dev->base_addr, CSR4, CSR4_APAD_XMIT|CSR4_MFCOM|CSR4_RCVCCOM|CSR4_TXSTRTM|CSR4_JABM);
303 write_rreg (dev->base_addr, CSR0, CSR0_IENA|CSR0_STRT);
306 static void am79c961_timer(unsigned long data)
308 struct net_device *dev = (struct net_device *)data;
309 struct dev_priv *priv = netdev_priv(dev);
310 unsigned int lnkstat, carrier;
313 spin_lock_irqsave(&priv->chip_lock, flags);
314 lnkstat = read_ireg(dev->base_addr, ISALED0) & ISALED0_LNKST;
315 spin_unlock_irqrestore(&priv->chip_lock, flags);
316 carrier = netif_carrier_ok(dev);
318 if (lnkstat && !carrier) {
319 netif_carrier_on(dev);
320 printk("%s: link up\n", dev->name);
321 } else if (!lnkstat && carrier) {
322 netif_carrier_off(dev);
323 printk("%s: link down\n", dev->name);
326 mod_timer(&priv->timer, jiffies + msecs_to_jiffies(500));
330 * Open/initialize the board.
333 am79c961_open(struct net_device *dev)
335 struct dev_priv *priv = netdev_priv(dev);
338 ret = request_irq(dev->irq, am79c961_interrupt, 0, dev->name, dev);
342 am79c961_init_for_open(dev);
344 netif_carrier_off(dev);
346 priv->timer.expires = jiffies;
347 add_timer(&priv->timer);
349 netif_start_queue(dev);
355 * The inverse routine to am79c961_open().
358 am79c961_close(struct net_device *dev)
360 struct dev_priv *priv = netdev_priv(dev);
363 del_timer_sync(&priv->timer);
365 netif_stop_queue(dev);
366 netif_carrier_off(dev);
368 spin_lock_irqsave(&priv->chip_lock, flags);
369 write_rreg (dev->base_addr, CSR0, CSR0_STOP);
370 write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
371 spin_unlock_irqrestore(&priv->chip_lock, flags);
373 free_irq (dev->irq, dev);
379 * Set or clear promiscuous/multicast mode filter for this adapter.
381 static void am79c961_setmulticastlist (struct net_device *dev)
383 struct dev_priv *priv = netdev_priv(dev);
385 u16 multi_hash[4], mode = am79c961_get_rx_mode(dev, multi_hash);
388 spin_lock_irqsave(&priv->chip_lock, flags);
390 stopped = read_rreg(dev->base_addr, CSR0) & CSR0_STOP;
394 * Put the chip into suspend mode
396 write_rreg(dev->base_addr, CTRL1, CTRL1_SPND);
399 * Spin waiting for chip to report suspend mode
401 while ((read_rreg(dev->base_addr, CTRL1) & CTRL1_SPND) == 0) {
402 spin_unlock_irqrestore(&priv->chip_lock, flags);
404 spin_lock_irqsave(&priv->chip_lock, flags);
409 * Update the multicast hash table
411 for (i = 0; i < ARRAY_SIZE(multi_hash); i++)
412 write_rreg(dev->base_addr, i + LADRL, multi_hash[i]);
415 * Write the mode register
417 write_rreg(dev->base_addr, MODE, mode);
421 * Put the chip back into running mode
423 write_rreg(dev->base_addr, CTRL1, 0);
426 spin_unlock_irqrestore(&priv->chip_lock, flags);
429 static void am79c961_timeout(struct net_device *dev)
431 printk(KERN_WARNING "%s: transmit timed out, network cable problem?\n",
435 * ought to do some setup of the tx side here
438 netif_wake_queue(dev);
445 am79c961_sendpacket(struct sk_buff *skb, struct net_device *dev)
447 struct dev_priv *priv = netdev_priv(dev);
448 unsigned int hdraddr, bufaddr;
453 hdraddr = priv->txhdr + (head << 3);
454 bufaddr = priv->txbuffer[head];
456 if (head >= TX_BUFFERS)
459 am_writebuffer (dev, bufaddr, skb->data, skb->len);
460 am_writeword (dev, hdraddr + 4, -skb->len);
461 am_writeword (dev, hdraddr + 2, TMD_OWN|TMD_STP|TMD_ENP);
464 spin_lock_irqsave(&priv->chip_lock, flags);
465 write_rreg (dev->base_addr, CSR0, CSR0_TDMD|CSR0_IENA);
466 spin_unlock_irqrestore(&priv->chip_lock, flags);
469 * If the next packet is owned by the ethernet device,
470 * then the tx ring is full and we can't add another
473 if (am_readword(dev, priv->txhdr + (priv->txhead << 3) + 2) & TMD_OWN)
474 netif_stop_queue(dev);
482 * If we have a good packet(s), get it/them out of the buffers.
485 am79c961_rx(struct net_device *dev, struct dev_priv *priv)
494 hdraddr = priv->rxhdr + (priv->rxtail << 3);
495 pktaddr = priv->rxbuffer[priv->rxtail];
497 status = am_readword (dev, hdraddr + 2);
498 if (status & RMD_OWN) /* do we own it? */
502 if (priv->rxtail >= RX_BUFFERS)
505 if ((status & (RMD_ERR|RMD_STP|RMD_ENP)) != (RMD_STP|RMD_ENP)) {
506 am_writeword (dev, hdraddr + 2, RMD_OWN);
507 dev->stats.rx_errors++;
508 if (status & RMD_ERR) {
509 if (status & RMD_FRAM)
510 dev->stats.rx_frame_errors++;
511 if (status & RMD_CRC)
512 dev->stats.rx_crc_errors++;
513 } else if (status & RMD_STP)
514 dev->stats.rx_length_errors++;
518 len = am_readword(dev, hdraddr + 6);
519 skb = dev_alloc_skb(len + 2);
524 am_readbuffer(dev, pktaddr, skb_put(skb, len), len);
525 am_writeword(dev, hdraddr + 2, RMD_OWN);
526 skb->protocol = eth_type_trans(skb, dev);
528 dev->stats.rx_bytes += len;
529 dev->stats.rx_packets++;
531 am_writeword (dev, hdraddr + 2, RMD_OWN);
532 printk (KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name);
533 dev->stats.rx_dropped++;
540 * Update stats for the transmitted packet
543 am79c961_tx(struct net_device *dev, struct dev_priv *priv)
550 hdraddr = priv->txhdr + (priv->txtail << 3);
551 status = am_readword (dev, hdraddr + 2);
552 if (status & TMD_OWN)
556 if (priv->txtail >= TX_BUFFERS)
559 if (status & TMD_ERR) {
562 dev->stats.tx_errors++;
564 status2 = am_readword (dev, hdraddr + 6);
567 * Clear the error byte
569 am_writeword (dev, hdraddr + 6, 0);
571 if (status2 & TST_RTRY)
572 dev->stats.collisions += 16;
573 if (status2 & TST_LCOL)
574 dev->stats.tx_window_errors++;
575 if (status2 & TST_LCAR)
576 dev->stats.tx_carrier_errors++;
577 if (status2 & TST_UFLO)
578 dev->stats.tx_fifo_errors++;
581 dev->stats.tx_packets++;
582 len = am_readword (dev, hdraddr + 4);
583 dev->stats.tx_bytes += -len;
584 } while (priv->txtail != priv->txhead);
586 netif_wake_queue(dev);
590 am79c961_interrupt(int irq, void *dev_id)
592 struct net_device *dev = (struct net_device *)dev_id;
593 struct dev_priv *priv = netdev_priv(dev);
594 u_int status, n = 100;
598 status = read_rreg(dev->base_addr, CSR0);
599 write_rreg(dev->base_addr, CSR0, status &
600 (CSR0_IENA|CSR0_TINT|CSR0_RINT|
601 CSR0_MERR|CSR0_MISS|CSR0_CERR|CSR0_BABL));
603 if (status & CSR0_RINT) {
605 am79c961_rx(dev, priv);
607 if (status & CSR0_TINT) {
609 am79c961_tx(dev, priv);
611 if (status & CSR0_MISS) {
613 dev->stats.rx_dropped++;
615 if (status & CSR0_CERR) {
617 mod_timer(&priv->timer, jiffies);
619 } while (--n && status & (CSR0_RINT | CSR0_TINT));
621 return IRQ_RETVAL(handled);
624 #ifdef CONFIG_NET_POLL_CONTROLLER
625 static void am79c961_poll_controller(struct net_device *dev)
628 local_irq_save(flags);
629 am79c961_interrupt(dev->irq, dev);
630 local_irq_restore(flags);
635 * Initialise the chip. Note that we always expect
636 * to be entered with interrupts enabled.
639 am79c961_hw_init(struct net_device *dev)
641 struct dev_priv *priv = netdev_priv(dev);
643 spin_lock_irq(&priv->chip_lock);
644 write_rreg (dev->base_addr, CSR0, CSR0_STOP);
645 write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
646 spin_unlock_irq(&priv->chip_lock);
648 am79c961_ramtest(dev, 0x66);
649 am79c961_ramtest(dev, 0x99);
654 static void __init am79c961_banner(void)
656 static unsigned version_printed;
658 if (net_debug && version_printed++ == 0)
659 printk(KERN_INFO "%s", version);
661 static const struct net_device_ops am79c961_netdev_ops = {
662 .ndo_open = am79c961_open,
663 .ndo_stop = am79c961_close,
664 .ndo_start_xmit = am79c961_sendpacket,
665 .ndo_set_rx_mode = am79c961_setmulticastlist,
666 .ndo_tx_timeout = am79c961_timeout,
667 .ndo_validate_addr = eth_validate_addr,
668 .ndo_change_mtu = eth_change_mtu,
669 .ndo_set_mac_address = eth_mac_addr,
670 #ifdef CONFIG_NET_POLL_CONTROLLER
671 .ndo_poll_controller = am79c961_poll_controller,
675 static int __devinit am79c961_probe(struct platform_device *pdev)
677 struct resource *res;
678 struct net_device *dev;
679 struct dev_priv *priv;
682 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
686 dev = alloc_etherdev(sizeof(struct dev_priv));
691 SET_NETDEV_DEV(dev, &pdev->dev);
693 priv = netdev_priv(dev);
696 * Fixed address and IRQ lines here.
697 * The PNP initialisation should have been
698 * done by the ether bootp loader.
700 dev->base_addr = res->start;
701 ret = platform_get_irq(pdev, 0);
710 if (!request_region(dev->base_addr, 0x18, dev->name))
716 inb(dev->base_addr + NET_RESET);
720 * Check the manufacturer part of the
723 if (inb(dev->base_addr) != 0x08 ||
724 inb(dev->base_addr + 2) != 0x00 ||
725 inb(dev->base_addr + 4) != 0x2b)
728 for (i = 0; i < 6; i++)
729 dev->dev_addr[i] = inb(dev->base_addr + i * 2) & 0xff;
733 spin_lock_init(&priv->chip_lock);
734 init_timer(&priv->timer);
735 priv->timer.data = (unsigned long)dev;
736 priv->timer.function = am79c961_timer;
738 if (am79c961_hw_init(dev))
741 dev->netdev_ops = &am79c961_netdev_ops;
743 ret = register_netdev(dev);
745 printk(KERN_INFO "%s: ether address %pM\n",
746 dev->name, dev->dev_addr);
751 release_region(dev->base_addr, 0x18);
758 static struct platform_driver am79c961_driver = {
759 .probe = am79c961_probe,
765 static int __init am79c961_init(void)
767 return platform_driver_register(&am79c961_driver);
770 __initcall(am79c961_init);