2
* 7990.c -- LANCE ethernet IC generic routines.
3
* This is an attempt to separate out the bits of various ethernet
4
* drivers that are common because they all use the AMD 7990 LANCE
5
* (Local Area Network Controller for Ethernet) chip.
7
* Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>
9
* Most of this stuff was obtained by looking at other LANCE drivers,
10
* in particular a2065.[ch]. The AMD C-LANCE datasheet was also helpful.
11
* NB: this was made easy by the fact that Jes Sorensen had cleaned up
12
* most of a2025 and sunlance with the aim of merging them, so the
13
* common code was pretty obvious.
15
#include <linux/crc32.h>
16
#include <linux/delay.h>
17
#include <linux/errno.h>
18
#include <linux/netdevice.h>
19
#include <linux/etherdevice.h>
20
#include <linux/init.h>
21
#include <linux/module.h>
22
#include <linux/kernel.h>
23
#include <linux/types.h>
24
#include <linux/fcntl.h>
25
#include <linux/interrupt.h>
26
#include <linux/ioport.h>
28
#include <linux/route.h>
29
#include <linux/string.h>
30
#include <linux/skbuff.h>
32
/* Used for the temporal inet entries and routing */
33
#include <linux/socket.h>
34
#include <linux/bitops.h>
36
#include <asm/system.h>
39
#include <asm/pgtable.h>
41
#include <asm/blinken.h>
46
#define WRITERAP(lp,x) out_be16(lp->base + LANCE_RAP, (x))
47
#define WRITERDP(lp,x) out_be16(lp->base + LANCE_RDP, (x))
48
#define READRDP(lp) in_be16(lp->base + LANCE_RDP)
50
#if defined(CONFIG_HPLANCE) || defined(CONFIG_HPLANCE_MODULE)
57
#if defined(CONFIG_MVME147_NET) || defined(CONFIG_MVME147_NET_MODULE)
59
/* Lossage Factor Nine, Mr Sulu. */
60
#define WRITERAP(lp,x) (lp->writerap(lp,x))
61
#define WRITERDP(lp,x) (lp->writerdp(lp,x))
62
#define READRDP(lp) (lp->readrdp(lp))
66
/* These inlines can be used if only CONFIG_HPLANCE is defined */
67
static inline void WRITERAP(struct lance_private *lp, __u16 value)
70
out_be16(lp->base + HPLANCE_REGOFF + LANCE_RAP, value);
71
} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
74
static inline void WRITERDP(struct lance_private *lp, __u16 value)
77
out_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP, value);
78
} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
81
static inline __u16 READRDP(struct lance_private *lp)
85
value = in_be16(lp->base + HPLANCE_REGOFF + LANCE_RDP);
86
} while ((in_8(lp->base + HPLANCE_STATUS) & LE_ACK) == 0);
91
#endif /* CONFIG_HPLANCE || CONFIG_HPLANCE_MODULE */
93
/* debugging output macros, various flavours */
94
/* #define TEST_HITS */
96
#define PRINT_RINGS() \
99
for (t=0; t < RX_RING_SIZE; t++) { \
100
printk("R%d: @(%02X %04X) len %04X, mblen %04X, bits %02X\n",\
101
t, ib->brx_ring[t].rmd1_hadr, ib->brx_ring[t].rmd0,\
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ib->brx_ring[t].length,\
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ib->brx_ring[t].mblength, ib->brx_ring[t].rmd1_bits);\
105
for (t=0; t < TX_RING_SIZE; t++) { \
106
printk("T%d: @(%02X %04X) len %04X, misc %04X, bits %02X\n",\
107
t, ib->btx_ring[t].tmd1_hadr, ib->btx_ring[t].tmd0,\
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ib->btx_ring[t].length,\
109
ib->btx_ring[t].misc, ib->btx_ring[t].tmd1_bits);\
113
#define PRINT_RINGS()
116
/* Load the CSR registers. The LANCE has to be STOPped when we do this! */
117
static void load_csrs (struct lance_private *lp)
119
volatile struct lance_init_block *aib = lp->lance_init_block;
122
leptr = LANCE_ADDR (aib);
124
WRITERAP(lp, LE_CSR1); /* load address of init block */
125
WRITERDP(lp, leptr & 0xFFFF);
126
WRITERAP(lp, LE_CSR2);
127
WRITERDP(lp, leptr >> 16);
128
WRITERAP(lp, LE_CSR3);
129
WRITERDP(lp, lp->busmaster_regval); /* set byteswap/ALEctrl/byte ctrl */
131
/* Point back to csr0 */
132
WRITERAP(lp, LE_CSR0);
135
/* #define to 0 or 1 appropriately */
136
#define DEBUG_IRING 0
137
/* Set up the Lance Rx and Tx rings and the init block */
138
static void lance_init_ring (struct net_device *dev)
140
struct lance_private *lp = netdev_priv(dev);
141
volatile struct lance_init_block *ib = lp->init_block;
142
volatile struct lance_init_block *aib; /* for LANCE_ADDR computations */
146
aib = lp->lance_init_block;
148
lp->rx_new = lp->tx_new = 0;
149
lp->rx_old = lp->tx_old = 0;
151
ib->mode = LE_MO_PROM; /* normal, enable Tx & Rx */
153
/* Copy the ethernet address to the lance init block
154
* Notice that we do a byteswap if we're big endian.
155
* [I think this is the right criterion; at least, sunlance,
156
* a2065 and atarilance do the byteswap and lance.c (PC) doesn't.
157
* However, the datasheet says that the BSWAP bit doesn't affect
158
* the init block, so surely it should be low byte first for
160
* We could define the ib->physaddr as three 16bit values and
161
* use (addr[1] << 8) | addr[0] & co, but this is more efficient.
164
ib->phys_addr [0] = dev->dev_addr [1];
165
ib->phys_addr [1] = dev->dev_addr [0];
166
ib->phys_addr [2] = dev->dev_addr [3];
167
ib->phys_addr [3] = dev->dev_addr [2];
168
ib->phys_addr [4] = dev->dev_addr [5];
169
ib->phys_addr [5] = dev->dev_addr [4];
172
ib->phys_addr[i] = dev->dev_addr[i];
176
printk ("TX rings:\n");
179
/* Setup the Tx ring entries */
180
for (i = 0; i < (1<<lp->lance_log_tx_bufs); i++) {
181
leptr = LANCE_ADDR(&aib->tx_buf[i][0]);
182
ib->btx_ring [i].tmd0 = leptr;
183
ib->btx_ring [i].tmd1_hadr = leptr >> 16;
184
ib->btx_ring [i].tmd1_bits = 0;
185
ib->btx_ring [i].length = 0xf000; /* The ones required by tmd2 */
186
ib->btx_ring [i].misc = 0;
188
printk ("%d: 0x%8.8x\n", i, leptr);
191
/* Setup the Rx ring entries */
193
printk ("RX rings:\n");
194
for (i = 0; i < (1<<lp->lance_log_rx_bufs); i++) {
195
leptr = LANCE_ADDR(&aib->rx_buf[i][0]);
197
ib->brx_ring [i].rmd0 = leptr;
198
ib->brx_ring [i].rmd1_hadr = leptr >> 16;
199
ib->brx_ring [i].rmd1_bits = LE_R1_OWN;
200
/* 0xf000 == bits that must be one (reserved, presumably) */
201
ib->brx_ring [i].length = -RX_BUFF_SIZE | 0xf000;
202
ib->brx_ring [i].mblength = 0;
204
printk ("%d: 0x%8.8x\n", i, leptr);
207
/* Setup the initialization block */
209
/* Setup rx descriptor pointer */
210
leptr = LANCE_ADDR(&aib->brx_ring);
211
ib->rx_len = (lp->lance_log_rx_bufs << 13) | (leptr >> 16);
214
printk ("RX ptr: %8.8x\n", leptr);
216
/* Setup tx descriptor pointer */
217
leptr = LANCE_ADDR(&aib->btx_ring);
218
ib->tx_len = (lp->lance_log_tx_bufs << 13) | (leptr >> 16);
221
printk ("TX ptr: %8.8x\n", leptr);
223
/* Clear the multicast filter */
229
/* LANCE must be STOPped before we do this, too... */
230
static int init_restart_lance (struct lance_private *lp)
234
WRITERAP(lp, LE_CSR0);
235
WRITERDP(lp, LE_C0_INIT);
237
/* Need a hook here for sunlance ledma stuff */
239
/* Wait for the lance to complete initialization */
240
for (i = 0; (i < 100) && !(READRDP(lp) & (LE_C0_ERR | LE_C0_IDON)); i++)
242
if ((i == 100) || (READRDP(lp) & LE_C0_ERR)) {
243
printk ("LANCE unopened after %d ticks, csr0=%4.4x.\n", i, READRDP(lp));
247
/* Clear IDON by writing a "1", enable interrupts and start lance */
248
WRITERDP(lp, LE_C0_IDON);
249
WRITERDP(lp, LE_C0_INEA | LE_C0_STRT);
254
static int lance_reset (struct net_device *dev)
256
struct lance_private *lp = netdev_priv(dev);
260
WRITERAP(lp, LE_CSR0);
261
WRITERDP(lp, LE_C0_STOP);
264
lance_init_ring (dev);
265
dev->trans_start = jiffies; /* prevent tx timeout */
266
status = init_restart_lance (lp);
268
printk ("Lance restart=%d\n", status);
273
static int lance_rx (struct net_device *dev)
275
struct lance_private *lp = netdev_priv(dev);
276
volatile struct lance_init_block *ib = lp->init_block;
277
volatile struct lance_rx_desc *rd;
285
for (i = 0; i < RX_RING_SIZE; i++) {
288
ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "_" : "X");
291
ib->brx_ring [i].rmd1_bits & LE_R1_OWN ? "." : "1");
296
blinken_leds(0x40, 0);
298
WRITERDP(lp, LE_C0_RINT | LE_C0_INEA); /* ack Rx int, reenable ints */
299
for (rd = &ib->brx_ring [lp->rx_new]; /* For each Rx ring we own... */
300
!((bits = rd->rmd1_bits) & LE_R1_OWN);
301
rd = &ib->brx_ring [lp->rx_new]) {
303
/* We got an incomplete frame? */
304
if ((bits & LE_R1_POK) != LE_R1_POK) {
305
dev->stats.rx_over_errors++;
306
dev->stats.rx_errors++;
308
} else if (bits & LE_R1_ERR) {
309
/* Count only the end frame as a rx error,
312
if (bits & LE_R1_BUF) dev->stats.rx_fifo_errors++;
313
if (bits & LE_R1_CRC) dev->stats.rx_crc_errors++;
314
if (bits & LE_R1_OFL) dev->stats.rx_over_errors++;
315
if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
316
if (bits & LE_R1_EOP) dev->stats.rx_errors++;
318
int len = (rd->mblength & 0xfff) - 4;
319
struct sk_buff *skb = dev_alloc_skb (len+2);
322
printk ("%s: Memory squeeze, deferring packet.\n",
324
dev->stats.rx_dropped++;
326
rd->rmd1_bits = LE_R1_OWN;
327
lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
331
skb_reserve (skb, 2); /* 16 byte align */
332
skb_put (skb, len); /* make room */
333
skb_copy_to_linear_data(skb,
334
(unsigned char *)&(ib->rx_buf [lp->rx_new][0]),
336
skb->protocol = eth_type_trans (skb, dev);
338
dev->stats.rx_packets++;
339
dev->stats.rx_bytes += len;
342
/* Return the packet to the pool */
344
rd->rmd1_bits = LE_R1_OWN;
345
lp->rx_new = (lp->rx_new + 1) & lp->rx_ring_mod_mask;
350
static int lance_tx (struct net_device *dev)
352
struct lance_private *lp = netdev_priv(dev);
353
volatile struct lance_init_block *ib = lp->init_block;
354
volatile struct lance_tx_desc *td;
359
blinken_leds(0x80, 0);
362
WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
366
for (i = j; i != lp->tx_new; i = j) {
367
td = &ib->btx_ring [i];
369
/* If we hit a packet not owned by us, stop */
370
if (td->tmd1_bits & LE_T1_OWN)
373
if (td->tmd1_bits & LE_T1_ERR) {
376
dev->stats.tx_errors++;
377
if (status & LE_T3_RTY) dev->stats.tx_aborted_errors++;
378
if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;
380
if (status & LE_T3_CLOS) {
381
dev->stats.tx_carrier_errors++;
382
if (lp->auto_select) {
383
lp->tpe = 1 - lp->tpe;
384
printk("%s: Carrier Lost, trying %s\n",
385
dev->name, lp->tpe?"TPE":"AUI");
387
WRITERAP(lp, LE_CSR0);
388
WRITERDP(lp, LE_C0_STOP);
389
lance_init_ring (dev);
391
init_restart_lance (lp);
396
/* buffer errors and underflows turn off the transmitter */
397
/* Restart the adapter */
398
if (status & (LE_T3_BUF|LE_T3_UFL)) {
399
dev->stats.tx_fifo_errors++;
401
printk ("%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
404
WRITERAP(lp, LE_CSR0);
405
WRITERDP(lp, LE_C0_STOP);
406
lance_init_ring (dev);
408
init_restart_lance (lp);
411
} else if ((td->tmd1_bits & LE_T1_POK) == LE_T1_POK) {
413
* So we don't count the packet more than once.
415
td->tmd1_bits &= ~(LE_T1_POK);
417
/* One collision before packet was sent. */
418
if (td->tmd1_bits & LE_T1_EONE)
419
dev->stats.collisions++;
421
/* More than one collision, be optimistic. */
422
if (td->tmd1_bits & LE_T1_EMORE)
423
dev->stats.collisions += 2;
425
dev->stats.tx_packets++;
428
j = (j + 1) & lp->tx_ring_mod_mask;
431
WRITERDP(lp, LE_C0_TINT | LE_C0_INEA);
436
lance_interrupt (int irq, void *dev_id)
438
struct net_device *dev = (struct net_device *)dev_id;
439
struct lance_private *lp = netdev_priv(dev);
442
spin_lock (&lp->devlock);
444
WRITERAP(lp, LE_CSR0); /* LANCE Controller Status */
449
if (!(csr0 & LE_C0_INTR)) { /* Check if any interrupt has */
450
spin_unlock (&lp->devlock);
451
return IRQ_NONE; /* been generated by the Lance. */
454
/* Acknowledge all the interrupt sources ASAP */
455
WRITERDP(lp, csr0 & ~(LE_C0_INEA|LE_C0_TDMD|LE_C0_STOP|LE_C0_STRT|LE_C0_INIT));
457
if ((csr0 & LE_C0_ERR)) {
458
/* Clear the error condition */
459
WRITERDP(lp, LE_C0_BABL|LE_C0_ERR|LE_C0_MISS|LE_C0_INEA);
462
if (csr0 & LE_C0_RINT)
465
if (csr0 & LE_C0_TINT)
468
/* Log misc errors. */
469
if (csr0 & LE_C0_BABL)
470
dev->stats.tx_errors++; /* Tx babble. */
471
if (csr0 & LE_C0_MISS)
472
dev->stats.rx_errors++; /* Missed a Rx frame. */
473
if (csr0 & LE_C0_MERR) {
474
printk("%s: Bus master arbitration failure, status %4.4x.\n",
476
/* Restart the chip. */
477
WRITERDP(lp, LE_C0_STRT);
480
if (lp->tx_full && netif_queue_stopped(dev) && (TX_BUFFS_AVAIL >= 0)) {
482
netif_wake_queue (dev);
485
WRITERAP(lp, LE_CSR0);
486
WRITERDP(lp, LE_C0_BABL|LE_C0_CERR|LE_C0_MISS|LE_C0_MERR|LE_C0_IDON|LE_C0_INEA);
488
spin_unlock (&lp->devlock);
492
int lance_open (struct net_device *dev)
494
struct lance_private *lp = netdev_priv(dev);
497
/* Install the Interrupt handler. Or we could shunt this out to specific drivers? */
498
if (request_irq(lp->irq, lance_interrupt, IRQF_SHARED, lp->name, dev))
501
res = lance_reset(dev);
502
spin_lock_init(&lp->devlock);
503
netif_start_queue (dev);
507
EXPORT_SYMBOL_GPL(lance_open);
509
int lance_close (struct net_device *dev)
511
struct lance_private *lp = netdev_priv(dev);
513
netif_stop_queue (dev);
516
WRITERAP(lp, LE_CSR0);
517
WRITERDP(lp, LE_C0_STOP);
519
free_irq(lp->irq, dev);
523
EXPORT_SYMBOL_GPL(lance_close);
525
void lance_tx_timeout(struct net_device *dev)
527
printk("lance_tx_timeout\n");
529
dev->trans_start = jiffies; /* prevent tx timeout */
530
netif_wake_queue (dev);
532
EXPORT_SYMBOL_GPL(lance_tx_timeout);
534
int lance_start_xmit (struct sk_buff *skb, struct net_device *dev)
536
struct lance_private *lp = netdev_priv(dev);
537
volatile struct lance_init_block *ib = lp->init_block;
538
int entry, skblen, len;
543
return NETDEV_TX_LOCKED;
545
netif_stop_queue (dev);
550
/* dump the packet */
554
for (i = 0; i < 64; i++) {
557
printk ("%2.2x ", skb->data [i]);
561
len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;
562
entry = lp->tx_new & lp->tx_ring_mod_mask;
563
ib->btx_ring [entry].length = (-len) | 0xf000;
564
ib->btx_ring [entry].misc = 0;
566
if (skb->len < ETH_ZLEN)
567
memset((void *)&ib->tx_buf[entry][0], 0, ETH_ZLEN);
568
skb_copy_from_linear_data(skb, (void *)&ib->tx_buf[entry][0], skblen);
570
/* Now, give the packet to the lance */
571
ib->btx_ring [entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
572
lp->tx_new = (lp->tx_new+1) & lp->tx_ring_mod_mask;
575
/* Kick the lance: transmit now */
576
WRITERDP(lp, LE_C0_INEA | LE_C0_TDMD);
579
spin_lock_irqsave (&lp->devlock, flags);
581
netif_start_queue (dev);
584
spin_unlock_irqrestore (&lp->devlock, flags);
588
EXPORT_SYMBOL_GPL(lance_start_xmit);
590
/* taken from the depca driver via a2065.c */
591
static void lance_load_multicast (struct net_device *dev)
593
struct lance_private *lp = netdev_priv(dev);
594
volatile struct lance_init_block *ib = lp->init_block;
595
volatile u16 *mcast_table = (u16 *)&ib->filter;
596
struct netdev_hw_addr *ha;
599
/* set all multicast bits */
600
if (dev->flags & IFF_ALLMULTI){
601
ib->filter [0] = 0xffffffff;
602
ib->filter [1] = 0xffffffff;
605
/* clear the multicast filter */
610
netdev_for_each_mc_addr(ha, dev) {
611
crc = ether_crc_le(6, ha->addr);
613
mcast_table [crc >> 4] |= 1 << (crc & 0xf);
618
void lance_set_multicast (struct net_device *dev)
620
struct lance_private *lp = netdev_priv(dev);
621
volatile struct lance_init_block *ib = lp->init_block;
624
stopped = netif_queue_stopped(dev);
626
netif_stop_queue (dev);
628
while (lp->tx_old != lp->tx_new)
631
WRITERAP(lp, LE_CSR0);
632
WRITERDP(lp, LE_C0_STOP);
633
lance_init_ring (dev);
635
if (dev->flags & IFF_PROMISC) {
636
ib->mode |= LE_MO_PROM;
638
ib->mode &= ~LE_MO_PROM;
639
lance_load_multicast (dev);
642
init_restart_lance (lp);
645
netif_start_queue (dev);
647
EXPORT_SYMBOL_GPL(lance_set_multicast);
649
#ifdef CONFIG_NET_POLL_CONTROLLER
650
void lance_poll(struct net_device *dev)
652
struct lance_private *lp = netdev_priv(dev);
654
spin_lock (&lp->devlock);
655
WRITERAP(lp, LE_CSR0);
656
WRITERDP(lp, LE_C0_STRT);
657
spin_unlock (&lp->devlock);
658
lance_interrupt(dev->irq, dev);
662
MODULE_LICENSE("GPL");