2 * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.
4 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/errno.h>
12 #include <linux/init.h>
13 #include <linux/types.h>
14 #include <linux/interrupt.h>
15 #include <linux/string.h>
16 #include <linux/delay.h>
17 #include <linux/netdevice.h>
18 #include <linux/platform_device.h>
19 #include <linux/etherdevice.h>
20 #include <linux/skbuff.h>
22 #include <asm/sgi/hpc3.h>
23 #include <asm/sgi/ip22.h>
24 #include <asm/sgi/seeq.h>
28 static char *sgiseeqstr
= "SGI Seeq8003";
31 * If you want speed, you do something silly, it always has worked for me. So,
32 * with that in mind, I've decided to make this driver look completely like a
33 * stupid Lance from a driver architecture perspective. Only difference is that
34 * here our "ring buffer" looks and acts like a real Lance one does but is
35 * layed out like how the HPC DMA and the Seeq want it to. You'd be surprised
36 * how a stupid idea like this can pay off in performance, not to mention
37 * making this driver 2,000 times easier to write. ;-)
40 /* Tune these if we tend to run out often etc. */
41 #define SEEQ_RX_BUFFERS 16
42 #define SEEQ_TX_BUFFERS 16
44 #define PKT_BUF_SZ 1584
46 #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
47 #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
48 #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
49 #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
51 #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
52 sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
53 sp->tx_old - sp->tx_new - 1)
55 #define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \
56 (dma_addr_t)((unsigned long)(v) - \
57 (unsigned long)((sp)->rx_desc)))
59 /* Copy frames shorter than rx_copybreak, otherwise pass on up in
60 * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).
62 static int rx_copybreak
= 100;
64 #define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))
66 struct sgiseeq_rx_desc
{
67 volatile struct hpc_dma_desc rdma
;
72 struct sgiseeq_tx_desc
{
73 volatile struct hpc_dma_desc tdma
;
79 * Warning: This structure is layed out in a certain way because HPC dma
80 * descriptors must be 8-byte aligned. So don't touch this without
83 struct sgiseeq_init_block
{ /* Note the name ;-) */
84 struct sgiseeq_rx_desc rxvector
[SEEQ_RX_BUFFERS
];
85 struct sgiseeq_tx_desc txvector
[SEEQ_TX_BUFFERS
];
88 struct sgiseeq_private
{
89 struct sgiseeq_init_block
*srings
;
90 dma_addr_t srings_dma
;
92 /* Ptrs to the descriptors in uncached space. */
93 struct sgiseeq_rx_desc
*rx_desc
;
94 struct sgiseeq_tx_desc
*tx_desc
;
97 struct hpc3_ethregs
*hregs
;
98 struct sgiseeq_regs
*sregs
;
100 /* Ring entry counters. */
101 unsigned int rx_new
, tx_new
;
102 unsigned int rx_old
, tx_old
;
105 unsigned char control
;
111 static inline void dma_sync_desc_cpu(struct net_device
*dev
, void *addr
)
113 dma_cache_sync(dev
->dev
.parent
, addr
, sizeof(struct sgiseeq_rx_desc
),
117 static inline void dma_sync_desc_dev(struct net_device
*dev
, void *addr
)
119 dma_cache_sync(dev
->dev
.parent
, addr
, sizeof(struct sgiseeq_rx_desc
),
123 static inline void hpc3_eth_reset(struct hpc3_ethregs
*hregs
)
125 hregs
->reset
= HPC3_ERST_CRESET
| HPC3_ERST_CLRIRQ
;
130 static inline void reset_hpc3_and_seeq(struct hpc3_ethregs
*hregs
,
131 struct sgiseeq_regs
*sregs
)
133 hregs
->rx_ctrl
= hregs
->tx_ctrl
= 0;
134 hpc3_eth_reset(hregs
);
137 #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
138 SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
140 static inline void seeq_go(struct sgiseeq_private
*sp
,
141 struct hpc3_ethregs
*hregs
,
142 struct sgiseeq_regs
*sregs
)
144 sregs
->rstat
= sp
->mode
| RSTAT_GO_BITS
;
145 hregs
->rx_ctrl
= HPC3_ERXCTRL_ACTIVE
;
148 static inline void __sgiseeq_set_mac_address(struct net_device
*dev
)
150 struct sgiseeq_private
*sp
= netdev_priv(dev
);
151 struct sgiseeq_regs
*sregs
= sp
->sregs
;
154 sregs
->tstat
= SEEQ_TCMD_RB0
;
155 for (i
= 0; i
< 6; i
++)
156 sregs
->rw
.eth_addr
[i
] = dev
->dev_addr
[i
];
159 static int sgiseeq_set_mac_address(struct net_device
*dev
, void *addr
)
161 struct sgiseeq_private
*sp
= netdev_priv(dev
);
162 struct sockaddr
*sa
= addr
;
164 memcpy(dev
->dev_addr
, sa
->sa_data
, dev
->addr_len
);
166 spin_lock_irq(&sp
->tx_lock
);
167 __sgiseeq_set_mac_address(dev
);
168 spin_unlock_irq(&sp
->tx_lock
);
173 #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
174 #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
175 #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
177 static int seeq_init_ring(struct net_device
*dev
)
179 struct sgiseeq_private
*sp
= netdev_priv(dev
);
182 netif_stop_queue(dev
);
183 sp
->rx_new
= sp
->tx_new
= 0;
184 sp
->rx_old
= sp
->tx_old
= 0;
186 __sgiseeq_set_mac_address(dev
);
189 for(i
= 0; i
< SEEQ_TX_BUFFERS
; i
++) {
190 sp
->tx_desc
[i
].tdma
.cntinfo
= TCNTINFO_INIT
;
191 dma_sync_desc_dev(dev
, &sp
->tx_desc
[i
]);
194 /* And now the rx ring. */
195 for (i
= 0; i
< SEEQ_RX_BUFFERS
; i
++) {
196 if (!sp
->rx_desc
[i
].skb
) {
198 struct sk_buff
*skb
= netdev_alloc_skb(dev
, PKT_BUF_SZ
);
203 dma_addr
= dma_map_single(dev
->dev
.parent
,
205 PKT_BUF_SZ
, DMA_FROM_DEVICE
);
206 sp
->rx_desc
[i
].skb
= skb
;
207 sp
->rx_desc
[i
].rdma
.pbuf
= dma_addr
;
209 sp
->rx_desc
[i
].rdma
.cntinfo
= RCNTINFO_INIT
;
210 dma_sync_desc_dev(dev
, &sp
->rx_desc
[i
]);
212 sp
->rx_desc
[i
- 1].rdma
.cntinfo
|= HPCDMA_EOR
;
213 dma_sync_desc_dev(dev
, &sp
->rx_desc
[i
- 1]);
217 static void seeq_purge_ring(struct net_device
*dev
)
219 struct sgiseeq_private
*sp
= netdev_priv(dev
);
223 for (i
= 0; i
< SEEQ_TX_BUFFERS
; i
++) {
224 if (sp
->tx_desc
[i
].skb
) {
225 dev_kfree_skb(sp
->tx_desc
[i
].skb
);
226 sp
->tx_desc
[i
].skb
= NULL
;
230 /* And now the rx ring. */
231 for (i
= 0; i
< SEEQ_RX_BUFFERS
; i
++) {
232 if (sp
->rx_desc
[i
].skb
) {
233 dev_kfree_skb(sp
->rx_desc
[i
].skb
);
234 sp
->rx_desc
[i
].skb
= NULL
;
240 static struct sgiseeq_private
*gpriv
;
241 static struct net_device
*gdev
;
243 static void sgiseeq_dump_rings(void)
246 struct sgiseeq_rx_desc
*r
= gpriv
->rx_desc
;
247 struct sgiseeq_tx_desc
*t
= gpriv
->tx_desc
;
248 struct hpc3_ethregs
*hregs
= gpriv
->hregs
;
254 printk("RING DUMP:\n");
255 for (i
= 0; i
< SEEQ_RX_BUFFERS
; i
++) {
256 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
257 i
, (&r
[i
]), r
[i
].rdma
.pbuf
, r
[i
].rdma
.cntinfo
,
260 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
261 i
, (&r
[i
]), r
[i
].rdma
.pbuf
, r
[i
].rdma
.cntinfo
,
264 for (i
= 0; i
< SEEQ_TX_BUFFERS
; i
++) {
265 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
266 i
, (&t
[i
]), t
[i
].tdma
.pbuf
, t
[i
].tdma
.cntinfo
,
269 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
270 i
, (&t
[i
]), t
[i
].tdma
.pbuf
, t
[i
].tdma
.cntinfo
,
273 printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
274 gpriv
->rx_new
, gpriv
->rx_old
, gpriv
->tx_new
, gpriv
->tx_old
);
275 printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
276 hregs
->rx_cbptr
, hregs
->rx_ndptr
, hregs
->rx_ctrl
);
277 printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
278 hregs
->tx_cbptr
, hregs
->tx_ndptr
, hregs
->tx_ctrl
);
282 #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
283 #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
285 static int init_seeq(struct net_device
*dev
, struct sgiseeq_private
*sp
,
286 struct sgiseeq_regs
*sregs
)
288 struct hpc3_ethregs
*hregs
= sp
->hregs
;
291 reset_hpc3_and_seeq(hregs
, sregs
);
292 err
= seeq_init_ring(dev
);
296 /* Setup to field the proper interrupt types. */
298 sregs
->tstat
= TSTAT_INIT_EDLC
;
299 sregs
->rw
.wregs
.control
= sp
->control
;
300 sregs
->rw
.wregs
.frame_gap
= 0;
302 sregs
->tstat
= TSTAT_INIT_SEEQ
;
305 hregs
->rx_ndptr
= VIRT_TO_DMA(sp
, sp
->rx_desc
);
306 hregs
->tx_ndptr
= VIRT_TO_DMA(sp
, sp
->tx_desc
);
308 seeq_go(sp
, hregs
, sregs
);
312 static void record_rx_errors(struct net_device
*dev
, unsigned char status
)
314 if (status
& SEEQ_RSTAT_OVERF
||
315 status
& SEEQ_RSTAT_SFRAME
)
316 dev
->stats
.rx_over_errors
++;
317 if (status
& SEEQ_RSTAT_CERROR
)
318 dev
->stats
.rx_crc_errors
++;
319 if (status
& SEEQ_RSTAT_DERROR
)
320 dev
->stats
.rx_frame_errors
++;
321 if (status
& SEEQ_RSTAT_REOF
)
322 dev
->stats
.rx_errors
++;
325 static inline void rx_maybe_restart(struct sgiseeq_private
*sp
,
326 struct hpc3_ethregs
*hregs
,
327 struct sgiseeq_regs
*sregs
)
329 if (!(hregs
->rx_ctrl
& HPC3_ERXCTRL_ACTIVE
)) {
330 hregs
->rx_ndptr
= VIRT_TO_DMA(sp
, sp
->rx_desc
+ sp
->rx_new
);
331 seeq_go(sp
, hregs
, sregs
);
335 static inline void sgiseeq_rx(struct net_device
*dev
, struct sgiseeq_private
*sp
,
336 struct hpc3_ethregs
*hregs
,
337 struct sgiseeq_regs
*sregs
)
339 struct sgiseeq_rx_desc
*rd
;
340 struct sk_buff
*skb
= NULL
;
341 struct sk_buff
*newskb
;
342 unsigned char pkt_status
;
344 unsigned int orig_end
= PREV_RX(sp
->rx_new
);
346 /* Service every received packet. */
347 rd
= &sp
->rx_desc
[sp
->rx_new
];
348 dma_sync_desc_cpu(dev
, rd
);
349 while (!(rd
->rdma
.cntinfo
& HPCDMA_OWN
)) {
350 len
= PKT_BUF_SZ
- (rd
->rdma
.cntinfo
& HPCDMA_BCNT
) - 3;
351 dma_unmap_single(dev
->dev
.parent
, rd
->rdma
.pbuf
,
352 PKT_BUF_SZ
, DMA_FROM_DEVICE
);
353 pkt_status
= rd
->skb
->data
[len
];
354 if (pkt_status
& SEEQ_RSTAT_FIG
) {
356 /* We don't want to receive our own packets */
357 if (memcmp(rd
->skb
->data
+ 6, dev
->dev_addr
, ETH_ALEN
)) {
358 if (len
> rx_copybreak
) {
360 newskb
= netdev_alloc_skb(dev
, PKT_BUF_SZ
);
366 skb_reserve(newskb
, 2);
368 skb
= netdev_alloc_skb_ip_align(dev
, len
);
370 skb_copy_to_linear_data(skb
, rd
->skb
->data
, len
);
377 skb
->protocol
= eth_type_trans(skb
, dev
);
379 dev
->stats
.rx_packets
++;
380 dev
->stats
.rx_bytes
+= len
;
382 printk(KERN_NOTICE
"%s: Memory squeeze, deferring packet.\n",
384 dev
->stats
.rx_dropped
++;
387 /* Silently drop my own packets */
391 record_rx_errors(dev
, pkt_status
);
395 rd
->rdma
.pbuf
= dma_map_single(dev
->dev
.parent
,
397 PKT_BUF_SZ
, DMA_FROM_DEVICE
);
399 /* Return the entry to the ring pool. */
400 rd
->rdma
.cntinfo
= RCNTINFO_INIT
;
401 sp
->rx_new
= NEXT_RX(sp
->rx_new
);
402 dma_sync_desc_dev(dev
, rd
);
403 rd
= &sp
->rx_desc
[sp
->rx_new
];
404 dma_sync_desc_cpu(dev
, rd
);
406 dma_sync_desc_cpu(dev
, &sp
->rx_desc
[orig_end
]);
407 sp
->rx_desc
[orig_end
].rdma
.cntinfo
&= ~(HPCDMA_EOR
);
408 dma_sync_desc_dev(dev
, &sp
->rx_desc
[orig_end
]);
409 dma_sync_desc_cpu(dev
, &sp
->rx_desc
[PREV_RX(sp
->rx_new
)]);
410 sp
->rx_desc
[PREV_RX(sp
->rx_new
)].rdma
.cntinfo
|= HPCDMA_EOR
;
411 dma_sync_desc_dev(dev
, &sp
->rx_desc
[PREV_RX(sp
->rx_new
)]);
412 rx_maybe_restart(sp
, hregs
, sregs
);
415 static inline void tx_maybe_reset_collisions(struct sgiseeq_private
*sp
,
416 struct sgiseeq_regs
*sregs
)
419 sregs
->rw
.wregs
.control
= sp
->control
& ~(SEEQ_CTRL_XCNT
);
420 sregs
->rw
.wregs
.control
= sp
->control
;
424 static inline void kick_tx(struct net_device
*dev
,
425 struct sgiseeq_private
*sp
,
426 struct hpc3_ethregs
*hregs
)
428 struct sgiseeq_tx_desc
*td
;
431 /* If the HPC aint doin nothin, and there are more packets
432 * with ETXD cleared and XIU set we must make very certain
433 * that we restart the HPC else we risk locking up the
434 * adapter. The following code is only safe iff the HPCDMA
437 td
= &sp
->tx_desc
[i
];
438 dma_sync_desc_cpu(dev
, td
);
439 while ((td
->tdma
.cntinfo
& (HPCDMA_XIU
| HPCDMA_ETXD
)) ==
440 (HPCDMA_XIU
| HPCDMA_ETXD
)) {
442 td
= &sp
->tx_desc
[i
];
443 dma_sync_desc_cpu(dev
, td
);
445 if (td
->tdma
.cntinfo
& HPCDMA_XIU
) {
446 hregs
->tx_ndptr
= VIRT_TO_DMA(sp
, td
);
447 hregs
->tx_ctrl
= HPC3_ETXCTRL_ACTIVE
;
451 static inline void sgiseeq_tx(struct net_device
*dev
, struct sgiseeq_private
*sp
,
452 struct hpc3_ethregs
*hregs
,
453 struct sgiseeq_regs
*sregs
)
455 struct sgiseeq_tx_desc
*td
;
456 unsigned long status
= hregs
->tx_ctrl
;
459 tx_maybe_reset_collisions(sp
, sregs
);
461 if (!(status
& (HPC3_ETXCTRL_ACTIVE
| SEEQ_TSTAT_PTRANS
))) {
462 /* Oops, HPC detected some sort of error. */
463 if (status
& SEEQ_TSTAT_R16
)
464 dev
->stats
.tx_aborted_errors
++;
465 if (status
& SEEQ_TSTAT_UFLOW
)
466 dev
->stats
.tx_fifo_errors
++;
467 if (status
& SEEQ_TSTAT_LCLS
)
468 dev
->stats
.collisions
++;
472 for (j
= sp
->tx_old
; j
!= sp
->tx_new
; j
= NEXT_TX(j
)) {
473 td
= &sp
->tx_desc
[j
];
475 dma_sync_desc_cpu(dev
, td
);
476 if (!(td
->tdma
.cntinfo
& (HPCDMA_XIU
)))
478 if (!(td
->tdma
.cntinfo
& (HPCDMA_ETXD
))) {
479 if (!(status
& HPC3_ETXCTRL_ACTIVE
)) {
480 hregs
->tx_ndptr
= VIRT_TO_DMA(sp
, td
);
481 hregs
->tx_ctrl
= HPC3_ETXCTRL_ACTIVE
;
485 dev
->stats
.tx_packets
++;
486 sp
->tx_old
= NEXT_TX(sp
->tx_old
);
487 td
->tdma
.cntinfo
&= ~(HPCDMA_XIU
| HPCDMA_XIE
);
488 td
->tdma
.cntinfo
|= HPCDMA_EOX
;
490 dev_kfree_skb_any(td
->skb
);
493 dma_sync_desc_dev(dev
, td
);
497 static irqreturn_t
sgiseeq_interrupt(int irq
, void *dev_id
)
499 struct net_device
*dev
= (struct net_device
*) dev_id
;
500 struct sgiseeq_private
*sp
= netdev_priv(dev
);
501 struct hpc3_ethregs
*hregs
= sp
->hregs
;
502 struct sgiseeq_regs
*sregs
= sp
->sregs
;
504 spin_lock(&sp
->tx_lock
);
506 /* Ack the IRQ and set software state. */
507 hregs
->reset
= HPC3_ERST_CLRIRQ
;
509 /* Always check for received packets. */
510 sgiseeq_rx(dev
, sp
, hregs
, sregs
);
512 /* Only check for tx acks if we have something queued. */
513 if (sp
->tx_old
!= sp
->tx_new
)
514 sgiseeq_tx(dev
, sp
, hregs
, sregs
);
516 if ((TX_BUFFS_AVAIL(sp
) > 0) && netif_queue_stopped(dev
)) {
517 netif_wake_queue(dev
);
519 spin_unlock(&sp
->tx_lock
);
524 static int sgiseeq_open(struct net_device
*dev
)
526 struct sgiseeq_private
*sp
= netdev_priv(dev
);
527 struct sgiseeq_regs
*sregs
= sp
->sregs
;
528 unsigned int irq
= dev
->irq
;
531 if (request_irq(irq
, sgiseeq_interrupt
, 0, sgiseeqstr
, dev
)) {
532 printk(KERN_ERR
"Seeq8003: Can't get irq %d\n", dev
->irq
);
536 err
= init_seeq(dev
, sp
, sregs
);
540 netif_start_queue(dev
);
550 static int sgiseeq_close(struct net_device
*dev
)
552 struct sgiseeq_private
*sp
= netdev_priv(dev
);
553 struct sgiseeq_regs
*sregs
= sp
->sregs
;
554 unsigned int irq
= dev
->irq
;
556 netif_stop_queue(dev
);
558 /* Shutdown the Seeq. */
559 reset_hpc3_and_seeq(sp
->hregs
, sregs
);
561 seeq_purge_ring(dev
);
566 static inline int sgiseeq_reset(struct net_device
*dev
)
568 struct sgiseeq_private
*sp
= netdev_priv(dev
);
569 struct sgiseeq_regs
*sregs
= sp
->sregs
;
572 err
= init_seeq(dev
, sp
, sregs
);
576 dev
->trans_start
= jiffies
;
577 netif_wake_queue(dev
);
582 static int sgiseeq_start_xmit(struct sk_buff
*skb
, struct net_device
*dev
)
584 struct sgiseeq_private
*sp
= netdev_priv(dev
);
585 struct hpc3_ethregs
*hregs
= sp
->hregs
;
587 struct sgiseeq_tx_desc
*td
;
590 spin_lock_irqsave(&sp
->tx_lock
, flags
);
594 if (len
< ETH_ZLEN
) {
595 if (skb_padto(skb
, ETH_ZLEN
))
600 dev
->stats
.tx_bytes
+= len
;
602 td
= &sp
->tx_desc
[entry
];
603 dma_sync_desc_cpu(dev
, td
);
605 /* Create entry. There are so many races with adding a new
606 * descriptor to the chain:
607 * 1) Assume that the HPC is off processing a DMA chain while
608 * we are changing all of the following.
609 * 2) Do no allow the HPC to look at a new descriptor until
610 * we have completely set up it's state. This means, do
611 * not clear HPCDMA_EOX in the current last descritptor
612 * until the one we are adding looks consistent and could
613 * be processes right now.
614 * 3) The tx interrupt code must notice when we've added a new
615 * entry and the HPC got to the end of the chain before we
616 * added this new entry and restarted it.
619 td
->tdma
.pbuf
= dma_map_single(dev
->dev
.parent
, skb
->data
,
621 td
->tdma
.cntinfo
= (len
& HPCDMA_BCNT
) |
622 HPCDMA_XIU
| HPCDMA_EOXP
| HPCDMA_XIE
| HPCDMA_EOX
;
623 dma_sync_desc_dev(dev
, td
);
624 if (sp
->tx_old
!= sp
->tx_new
) {
625 struct sgiseeq_tx_desc
*backend
;
627 backend
= &sp
->tx_desc
[PREV_TX(sp
->tx_new
)];
628 dma_sync_desc_cpu(dev
, backend
);
629 backend
->tdma
.cntinfo
&= ~HPCDMA_EOX
;
630 dma_sync_desc_dev(dev
, backend
);
632 sp
->tx_new
= NEXT_TX(sp
->tx_new
); /* Advance. */
634 /* Maybe kick the HPC back into motion. */
635 if (!(hregs
->tx_ctrl
& HPC3_ETXCTRL_ACTIVE
))
636 kick_tx(dev
, sp
, hregs
);
638 dev
->trans_start
= jiffies
;
640 if (!TX_BUFFS_AVAIL(sp
))
641 netif_stop_queue(dev
);
642 spin_unlock_irqrestore(&sp
->tx_lock
, flags
);
647 static void timeout(struct net_device
*dev
)
649 printk(KERN_NOTICE
"%s: transmit timed out, resetting\n", dev
->name
);
652 dev
->trans_start
= jiffies
;
653 netif_wake_queue(dev
);
656 static void sgiseeq_set_multicast(struct net_device
*dev
)
658 struct sgiseeq_private
*sp
= netdev_priv(dev
);
659 unsigned char oldmode
= sp
->mode
;
661 if(dev
->flags
& IFF_PROMISC
)
662 sp
->mode
= SEEQ_RCMD_RANY
;
663 else if ((dev
->flags
& IFF_ALLMULTI
) || dev
->mc_count
)
664 sp
->mode
= SEEQ_RCMD_RBMCAST
;
666 sp
->mode
= SEEQ_RCMD_RBCAST
;
668 /* XXX I know this sucks, but is there a better way to reprogram
669 * XXX the receiver? At least, this shouldn't happen too often.
672 if (oldmode
!= sp
->mode
)
676 static inline void setup_tx_ring(struct net_device
*dev
,
677 struct sgiseeq_tx_desc
*buf
,
680 struct sgiseeq_private
*sp
= netdev_priv(dev
);
683 while (i
< (nbufs
- 1)) {
684 buf
[i
].tdma
.pnext
= VIRT_TO_DMA(sp
, buf
+ i
+ 1);
685 buf
[i
].tdma
.pbuf
= 0;
686 dma_sync_desc_dev(dev
, &buf
[i
]);
689 buf
[i
].tdma
.pnext
= VIRT_TO_DMA(sp
, buf
);
690 dma_sync_desc_dev(dev
, &buf
[i
]);
693 static inline void setup_rx_ring(struct net_device
*dev
,
694 struct sgiseeq_rx_desc
*buf
,
697 struct sgiseeq_private
*sp
= netdev_priv(dev
);
700 while (i
< (nbufs
- 1)) {
701 buf
[i
].rdma
.pnext
= VIRT_TO_DMA(sp
, buf
+ i
+ 1);
702 buf
[i
].rdma
.pbuf
= 0;
703 dma_sync_desc_dev(dev
, &buf
[i
]);
706 buf
[i
].rdma
.pbuf
= 0;
707 buf
[i
].rdma
.pnext
= VIRT_TO_DMA(sp
, buf
);
708 dma_sync_desc_dev(dev
, &buf
[i
]);
711 static const struct net_device_ops sgiseeq_netdev_ops
= {
712 .ndo_open
= sgiseeq_open
,
713 .ndo_stop
= sgiseeq_close
,
714 .ndo_start_xmit
= sgiseeq_start_xmit
,
715 .ndo_tx_timeout
= timeout
,
716 .ndo_set_multicast_list
= sgiseeq_set_multicast
,
717 .ndo_set_mac_address
= sgiseeq_set_mac_address
,
718 .ndo_change_mtu
= eth_change_mtu
,
719 .ndo_validate_addr
= eth_validate_addr
,
722 static int __devinit
sgiseeq_probe(struct platform_device
*pdev
)
724 struct sgiseeq_platform_data
*pd
= pdev
->dev
.platform_data
;
725 struct hpc3_regs
*hpcregs
= pd
->hpc
;
726 struct sgiseeq_init_block
*sr
;
727 unsigned int irq
= pd
->irq
;
728 struct sgiseeq_private
*sp
;
729 struct net_device
*dev
;
732 dev
= alloc_etherdev(sizeof (struct sgiseeq_private
));
734 printk(KERN_ERR
"Sgiseeq: Etherdev alloc failed, aborting.\n");
739 platform_set_drvdata(pdev
, dev
);
740 sp
= netdev_priv(dev
);
742 /* Make private data page aligned */
743 sr
= dma_alloc_noncoherent(&pdev
->dev
, sizeof(*sp
->srings
),
744 &sp
->srings_dma
, GFP_KERNEL
);
746 printk(KERN_ERR
"Sgiseeq: Page alloc failed, aborting.\n");
748 goto err_out_free_dev
;
751 sp
->rx_desc
= sp
->srings
->rxvector
;
752 sp
->tx_desc
= sp
->srings
->txvector
;
754 /* A couple calculations now, saves many cycles later. */
755 setup_rx_ring(dev
, sp
->rx_desc
, SEEQ_RX_BUFFERS
);
756 setup_tx_ring(dev
, sp
->tx_desc
, SEEQ_TX_BUFFERS
);
758 memcpy(dev
->dev_addr
, pd
->mac
, ETH_ALEN
);
764 sp
->sregs
= (struct sgiseeq_regs
*) &hpcregs
->eth_ext
[0];
765 sp
->hregs
= &hpcregs
->ethregs
;
766 sp
->name
= sgiseeqstr
;
767 sp
->mode
= SEEQ_RCMD_RBCAST
;
769 /* Setup PIO and DMA transfer timing */
770 sp
->hregs
->pconfig
= 0x161;
771 sp
->hregs
->dconfig
= HPC3_EDCFG_FIRQ
| HPC3_EDCFG_FEOP
|
772 HPC3_EDCFG_FRXDC
| HPC3_EDCFG_PTO
| 0x026;
774 /* Setup PIO and DMA transfer timing */
775 sp
->hregs
->pconfig
= 0x161;
776 sp
->hregs
->dconfig
= HPC3_EDCFG_FIRQ
| HPC3_EDCFG_FEOP
|
777 HPC3_EDCFG_FRXDC
| HPC3_EDCFG_PTO
| 0x026;
779 /* Reset the chip. */
780 hpc3_eth_reset(sp
->hregs
);
782 sp
->is_edlc
= !(sp
->sregs
->rw
.rregs
.collision_tx
[0] & 0xff);
784 sp
->control
= SEEQ_CTRL_XCNT
| SEEQ_CTRL_ACCNT
|
785 SEEQ_CTRL_SFLAG
| SEEQ_CTRL_ESHORT
|
788 dev
->netdev_ops
= &sgiseeq_netdev_ops
;
789 dev
->watchdog_timeo
= (200 * HZ
) / 1000;
792 if (register_netdev(dev
)) {
793 printk(KERN_ERR
"Sgiseeq: Cannot register net device, "
796 goto err_out_free_page
;
799 printk(KERN_INFO
"%s: %s %pM\n", dev
->name
, sgiseeqstr
, dev
->dev_addr
);
804 free_page((unsigned long) sp
->srings
);
812 static int __exit
sgiseeq_remove(struct platform_device
*pdev
)
814 struct net_device
*dev
= platform_get_drvdata(pdev
);
815 struct sgiseeq_private
*sp
= netdev_priv(dev
);
817 unregister_netdev(dev
);
818 dma_free_noncoherent(&pdev
->dev
, sizeof(*sp
->srings
), sp
->srings
,
821 platform_set_drvdata(pdev
, NULL
);
826 static struct platform_driver sgiseeq_driver
= {
827 .probe
= sgiseeq_probe
,
828 .remove
= __exit_p(sgiseeq_remove
),
831 .owner
= THIS_MODULE
,
835 static int __init
sgiseeq_module_init(void)
837 if (platform_driver_register(&sgiseeq_driver
)) {
838 printk(KERN_ERR
"Driver registration failed\n");
845 static void __exit
sgiseeq_module_exit(void)
847 platform_driver_unregister(&sgiseeq_driver
);
850 module_init(sgiseeq_module_init
);
851 module_exit(sgiseeq_module_exit
);
853 MODULE_DESCRIPTION("SGI Seeq 8003 driver");
854 MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
855 MODULE_LICENSE("GPL");
856 MODULE_ALIAS("platform:sgiseeq");