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Merge tag 'drm-intel-fixes-2013-07-11' of git://people.freedesktop.org/~danvet/drm...
[deliverable/linux.git] / drivers / net / ethernet / seeq / sgiseeq.c
CommitLineData
1da177e4
LT		 1/*
2 * sgiseeq.c: Seeq8003 ethernet driver for SGI machines.
3 *
79add627 4 * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
1da177e4 5 */
a4d4d518
RB		 6
7#undef DEBUG
8
b7f080cf 9#include <linux/dma-mapping.h>
1da177e4
LT		 10#include <linux/kernel.h>
11#include <linux/module.h>
5a0e3ad6 12#include <linux/slab.h>
1da177e4
LT		 13#include <linux/errno.h>
14#include <linux/init.h>
15#include <linux/types.h>
16#include <linux/interrupt.h>
1da177e4
LT		 17#include <linux/string.h>
18#include <linux/delay.h>
19#include <linux/netdevice.h>
df9f5408 20#include <linux/platform_device.h>
1da177e4
LT		 21#include <linux/etherdevice.h>
22#include <linux/skbuff.h>
1da177e4 23
1da177e4
LT		 24#include <asm/sgi/hpc3.h>
25#include <asm/sgi/ip22.h>
df9f5408 26#include <asm/sgi/seeq.h>
1da177e4
LT		 27
28#include "sgiseeq.h"
29
1da177e4
LT		 30static char *sgiseeqstr = "SGI Seeq8003";
31
32/*
33 * If you want speed, you do something silly, it always has worked for me. So,
34 * with that in mind, I've decided to make this driver look completely like a
35 * stupid Lance from a driver architecture perspective. Only difference is that
36 * here our "ring buffer" looks and acts like a real Lance one does but is
25985edc 37 * laid out like how the HPC DMA and the Seeq want it to. You'd be surprised
1da177e4
LT		 38 * how a stupid idea like this can pay off in performance, not to mention
39 * making this driver 2,000 times easier to write. ;-)
40 */
41
42/* Tune these if we tend to run out often etc. */
43#define SEEQ_RX_BUFFERS 16
44#define SEEQ_TX_BUFFERS 16
45
46#define PKT_BUF_SZ 1584
47
48#define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1))
49#define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1))
50#define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1))
51#define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1))
52
53#define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \
54 sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \
55 sp->tx_old - sp->tx_new - 1)
56
43831b15
TB		 57#define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \
58 (dma_addr_t)((unsigned long)(v) - \
59 (unsigned long)((sp)->rx_desc)))
60
43831b15
TB		 61/* Copy frames shorter than rx_copybreak, otherwise pass on up in
62 * a full sized sk_buff. Value of 100 stolen from tulip.c (!alpha).
63 */
64static int rx_copybreak = 100;
65
66#define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *))
67
1da177e4
LT		 68struct sgiseeq_rx_desc {
69 volatile struct hpc_dma_desc rdma;
43831b15
TB		 70 u8 padding[PAD_SIZE];
71 struct sk_buff *skb;
1da177e4
LT		 72};
73
74struct sgiseeq_tx_desc {
75 volatile struct hpc_dma_desc tdma;
43831b15
TB		 76 u8 padding[PAD_SIZE];
77 struct sk_buff *skb;
1da177e4
LT		 78};
79
80/*
25985edc 81 * Warning: This structure is laid out in a certain way because HPC dma
1da177e4
LT		 82 * descriptors must be 8-byte aligned. So don't touch this without
83 * some care.
84 */
85struct sgiseeq_init_block { /* Note the name ;-) */
86 struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS];
87 struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS];
88};
89
90struct sgiseeq_private {
91 struct sgiseeq_init_block *srings;
99cd149e 92 dma_addr_t srings_dma;
1da177e4
LT		 93
94 /* Ptrs to the descriptors in uncached space. */
95 struct sgiseeq_rx_desc *rx_desc;
96 struct sgiseeq_tx_desc *tx_desc;
97
98 char *name;
99 struct hpc3_ethregs *hregs;
100 struct sgiseeq_regs *sregs;
101
102 /* Ring entry counters. */
103 unsigned int rx_new, tx_new;
104 unsigned int rx_old, tx_old;
105
106 int is_edlc;
107 unsigned char control;
108 unsigned char mode;
109
1da177e4
LT		 110 spinlock_t tx_lock;
111};
112
49b11bc3
TB		 113static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr)
114{
115 dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
116 DMA_FROM_DEVICE);
117}
118
119static inline void dma_sync_desc_dev(struct net_device *dev, void *addr)
120{
121 dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc),
122 DMA_TO_DEVICE);
123}
124
1da177e4
LT		 125static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs)
126{
302a5c4b 127 hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ;
1da177e4 128 udelay(20);
302a5c4b 129 hregs->reset = 0;
1da177e4
LT		 130}
131
132static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs,
133 struct sgiseeq_regs *sregs)
134{
135 hregs->rx_ctrl = hregs->tx_ctrl = 0;
136 hpc3_eth_reset(hregs);
137}
138
139#define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \
140 SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC)
141
142static inline void seeq_go(struct sgiseeq_private *sp,
143 struct hpc3_ethregs *hregs,
144 struct sgiseeq_regs *sregs)
145{
146 sregs->rstat = sp->mode | RSTAT_GO_BITS;
147 hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE;
148}
149
150static inline void __sgiseeq_set_mac_address(struct net_device *dev)
151{
152 struct sgiseeq_private *sp = netdev_priv(dev);
153 struct sgiseeq_regs *sregs = sp->sregs;
154 int i;
155
156 sregs->tstat = SEEQ_TCMD_RB0;
157 for (i = 0; i < 6; i++)
158 sregs->rw.eth_addr[i] = dev->dev_addr[i];
159}
160
161static int sgiseeq_set_mac_address(struct net_device *dev, void *addr)
162{
163 struct sgiseeq_private *sp = netdev_priv(dev);
164 struct sockaddr *sa = addr;
165
166 memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
167
168 spin_lock_irq(&sp->tx_lock);
169 __sgiseeq_set_mac_address(dev);
170 spin_unlock_irq(&sp->tx_lock);
171
172 return 0;
173}
174
175#define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD)
176#define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE)
177#define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT))
178
179static int seeq_init_ring(struct net_device *dev)
180{
181 struct sgiseeq_private *sp = netdev_priv(dev);
182 int i;
183
184 netif_stop_queue(dev);
185 sp->rx_new = sp->tx_new = 0;
186 sp->rx_old = sp->tx_old = 0;
187
188 __sgiseeq_set_mac_address(dev);
189
190 /* Setup tx ring. */
191 for(i = 0; i < SEEQ_TX_BUFFERS; i++) {
1da177e4 192 sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT;
49b11bc3 193 dma_sync_desc_dev(dev, &sp->tx_desc[i]);
1da177e4
LT		 194 }
195
196 /* And now the rx ring. */
197 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
a24a789c 198 if (!sp->rx_desc[i].skb) {
43831b15
TB		 199 dma_addr_t dma_addr;
200 struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ);
1da177e4 201
43831b15 202 if (skb == NULL)
1da177e4 203 return -ENOMEM;
43831b15
TB		 204 skb_reserve(skb, 2);
205 dma_addr = dma_map_single(dev->dev.parent,
206 skb->data - 2,
207 PKT_BUF_SZ, DMA_FROM_DEVICE);
208 sp->rx_desc[i].skb = skb;
209 sp->rx_desc[i].rdma.pbuf = dma_addr;
1da177e4
LT		 210 }
211 sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT;
49b11bc3 212 dma_sync_desc_dev(dev, &sp->rx_desc[i]);
1da177e4
LT		 213 }
214 sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR;
49b11bc3 215 dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]);
1da177e4
LT		 216 return 0;
217}
218
43831b15
TB		 219static void seeq_purge_ring(struct net_device *dev)
220{
221 struct sgiseeq_private *sp = netdev_priv(dev);
222 int i;
223
224 /* clear tx ring. */
225 for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
226 if (sp->tx_desc[i].skb) {
227 dev_kfree_skb(sp->tx_desc[i].skb);
228 sp->tx_desc[i].skb = NULL;
229 }
230 }
231
232 /* And now the rx ring. */
233 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
234 if (sp->rx_desc[i].skb) {
235 dev_kfree_skb(sp->rx_desc[i].skb);
236 sp->rx_desc[i].skb = NULL;
237 }
238 }
239}
240
1da177e4
LT		 241#ifdef DEBUG
242static struct sgiseeq_private *gpriv;
243static struct net_device *gdev;
244
a4d4d518 245static void sgiseeq_dump_rings(void)
1da177e4
LT		 246{
247 static int once;
248 struct sgiseeq_rx_desc *r = gpriv->rx_desc;
249 struct sgiseeq_tx_desc *t = gpriv->tx_desc;
250 struct hpc3_ethregs *hregs = gpriv->hregs;
251 int i;
252
253 if (once)
254 return;
255 once++;
256 printk("RING DUMP:\n");
257 for (i = 0; i < SEEQ_RX_BUFFERS; i++) {
258 printk("RX [%d]: @(%p) [%08x,%08x,%08x] ",
259 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
260 r[i].rdma.pnext);
261 i += 1;
262 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
263 i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo,
264 r[i].rdma.pnext);
265 }
266 for (i = 0; i < SEEQ_TX_BUFFERS; i++) {
267 printk("TX [%d]: @(%p) [%08x,%08x,%08x] ",
268 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
269 t[i].tdma.pnext);
270 i += 1;
271 printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n",
272 i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo,
273 t[i].tdma.pnext);
274 }
275 printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n",
276 gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old);
277 printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n",
278 hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl);
279 printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n",
280 hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl);
281}
282#endif
283
284#define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF)
285#define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2)
1da177e4
LT		 286
287static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp,
288 struct sgiseeq_regs *sregs)
289{
290 struct hpc3_ethregs *hregs = sp->hregs;
291 int err;
292
293 reset_hpc3_and_seeq(hregs, sregs);
294 err = seeq_init_ring(dev);
295 if (err)
296 return err;
297
298 /* Setup to field the proper interrupt types. */
299 if (sp->is_edlc) {
300 sregs->tstat = TSTAT_INIT_EDLC;
301 sregs->rw.wregs.control = sp->control;
302 sregs->rw.wregs.frame_gap = 0;
303 } else {
304 sregs->tstat = TSTAT_INIT_SEEQ;
305 }
306
43831b15
TB		 307 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc);
308 hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc);
1da177e4
LT		 309
310 seeq_go(sp, hregs, sregs);
311 return 0;
312}
313
09f75cd7 314static void record_rx_errors(struct net_device *dev, unsigned char status)
1da177e4
LT		 315{
316 if (status & SEEQ_RSTAT_OVERF ||
317 status & SEEQ_RSTAT_SFRAME)
09f75cd7 318 dev->stats.rx_over_errors++;
1da177e4 319 if (status & SEEQ_RSTAT_CERROR)
09f75cd7 320 dev->stats.rx_crc_errors++;
1da177e4 321 if (status & SEEQ_RSTAT_DERROR)
09f75cd7 322 dev->stats.rx_frame_errors++;
1da177e4 323 if (status & SEEQ_RSTAT_REOF)
09f75cd7 324 dev->stats.rx_errors++;
1da177e4
LT		 325}
326
327static inline void rx_maybe_restart(struct sgiseeq_private *sp,
328 struct hpc3_ethregs *hregs,
329 struct sgiseeq_regs *sregs)
330{
331 if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) {
43831b15 332 hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new);
1da177e4
LT		 333 seeq_go(sp, hregs, sregs);
334 }
335}
336
1da177e4
LT		 337static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp,
338 struct hpc3_ethregs *hregs,
339 struct sgiseeq_regs *sregs)
340{
341 struct sgiseeq_rx_desc *rd;
a4d4d518 342 struct sk_buff *skb = NULL;
43831b15 343 struct sk_buff *newskb;
1da177e4 344 unsigned char pkt_status;
1da177e4
LT		 345 int len = 0;
346 unsigned int orig_end = PREV_RX(sp->rx_new);
347
348 /* Service every received packet. */
43831b15 349 rd = &sp->rx_desc[sp->rx_new];
49b11bc3 350 dma_sync_desc_cpu(dev, rd);
43831b15 351 while (!(rd->rdma.cntinfo & HPCDMA_OWN)) {
1da177e4 352 len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3;
43831b15
TB		 353 dma_unmap_single(dev->dev.parent, rd->rdma.pbuf,
354 PKT_BUF_SZ, DMA_FROM_DEVICE);
355 pkt_status = rd->skb->data[len];
1da177e4
LT		 356 if (pkt_status & SEEQ_RSTAT_FIG) {
357 /* Packet is OK. */
43831b15
TB		 358 /* We don't want to receive our own packets */
359 if (memcmp(rd->skb->data + 6, dev->dev_addr, ETH_ALEN)) {
360 if (len > rx_copybreak) {
361 skb = rd->skb;
362 newskb = netdev_alloc_skb(dev, PKT_BUF_SZ);
363 if (!newskb) {
364 newskb = skb;
365 skb = NULL;
366 goto memory_squeeze;
367 }
368 skb_reserve(newskb, 2);
369 } else {
89d71a66
ED		 370 skb = netdev_alloc_skb_ip_align(dev, len);
371 if (skb)
43831b15 372 skb_copy_to_linear_data(skb, rd->skb->data, len);
89d71a66 373
43831b15
TB		 374 newskb = rd->skb;
375 }
376memory_squeeze:
377 if (skb) {
378 skb_put(skb, len);
379 skb->protocol = eth_type_trans(skb, dev);
1da177e4 380 netif_rx(skb);
09f75cd7
JG		 381 dev->stats.rx_packets++;
382 dev->stats.rx_bytes += len;
1da177e4 383 } else {
43831b15 384 dev->stats.rx_dropped++;
1da177e4
LT		 385 }
386 } else {
43831b15
TB		 387 /* Silently drop my own packets */
388 newskb = rd->skb;
1da177e4
LT		 389 }
390 } else {
09f75cd7 391 record_rx_errors(dev, pkt_status);
43831b15 392 newskb = rd->skb;
1da177e4 393 }
43831b15
TB		 394 rd->skb = newskb;
395 rd->rdma.pbuf = dma_map_single(dev->dev.parent,
396 newskb->data - 2,
397 PKT_BUF_SZ, DMA_FROM_DEVICE);
1da177e4
LT		 398
399 /* Return the entry to the ring pool. */
400 rd->rdma.cntinfo = RCNTINFO_INIT;
401 sp->rx_new = NEXT_RX(sp->rx_new);
49b11bc3 402 dma_sync_desc_dev(dev, rd);
43831b15 403 rd = &sp->rx_desc[sp->rx_new];
49b11bc3 404 dma_sync_desc_cpu(dev, rd);
1da177e4 405 }
49b11bc3 406 dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]);
1da177e4 407 sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR);
49b11bc3
TB		 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)]);
1da177e4 410 sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR;
49b11bc3 411 dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]);
1da177e4
LT		 412 rx_maybe_restart(sp, hregs, sregs);
413}
414
415static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp,
416 struct sgiseeq_regs *sregs)
417{
418 if (sp->is_edlc) {
419 sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT);
420 sregs->rw.wregs.control = sp->control;
421 }
422}
423
43831b15
TB		 424static inline void kick_tx(struct net_device *dev,
425 struct sgiseeq_private *sp,
1da177e4
LT		 426 struct hpc3_ethregs *hregs)
427{
43831b15
TB		 428 struct sgiseeq_tx_desc *td;
429 int i = sp->tx_old;
430
1da177e4
LT		 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
435 * is not active!
436 */
43831b15 437 td = &sp->tx_desc[i];
49b11bc3 438 dma_sync_desc_cpu(dev, td);
1da177e4 439 while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) ==
43831b15
TB		 440 (HPCDMA_XIU | HPCDMA_ETXD)) {
441 i = NEXT_TX(i);
442 td = &sp->tx_desc[i];
49b11bc3 443 dma_sync_desc_cpu(dev, td);
43831b15 444 }
1da177e4 445 if (td->tdma.cntinfo & HPCDMA_XIU) {
43831b15 446 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
1da177e4
LT		 447 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
448 }
449}
450
451static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp,
452 struct hpc3_ethregs *hregs,
453 struct sgiseeq_regs *sregs)
454{
455 struct sgiseeq_tx_desc *td;
456 unsigned long status = hregs->tx_ctrl;
457 int j;
458
459 tx_maybe_reset_collisions(sp, sregs);
460
461 if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) {
462 /* Oops, HPC detected some sort of error. */
463 if (status & SEEQ_TSTAT_R16)
09f75cd7 464 dev->stats.tx_aborted_errors++;
1da177e4 465 if (status & SEEQ_TSTAT_UFLOW)
09f75cd7 466 dev->stats.tx_fifo_errors++;
1da177e4 467 if (status & SEEQ_TSTAT_LCLS)
09f75cd7 468 dev->stats.collisions++;
1da177e4
LT		 469 }
470
471 /* Ack 'em... */
472 for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) {
473 td = &sp->tx_desc[j];
474
49b11bc3 475 dma_sync_desc_cpu(dev, td);
1da177e4
LT		 476 if (!(td->tdma.cntinfo & (HPCDMA_XIU)))
477 break;
478 if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) {
479 if (!(status & HPC3_ETXCTRL_ACTIVE)) {
43831b15 480 hregs->tx_ndptr = VIRT_TO_DMA(sp, td);
1da177e4
LT		 481 hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE;
482 }
483 break;
484 }
09f75cd7 485 dev->stats.tx_packets++;
1da177e4
LT		 486 sp->tx_old = NEXT_TX(sp->tx_old);
487 td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE);
488 td->tdma.cntinfo |= HPCDMA_EOX;
43831b15
TB		 489 if (td->skb) {
490 dev_kfree_skb_any(td->skb);
491 td->skb = NULL;
492 }
49b11bc3 493 dma_sync_desc_dev(dev, td);
1da177e4
LT		 494 }
495}
496
7d12e780 497static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id)
1da177e4
LT		 498{
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;
503
504 spin_lock(&sp->tx_lock);
505
506 /* Ack the IRQ and set software state. */
302a5c4b 507 hregs->reset = HPC3_ERST_CLRIRQ;
1da177e4
LT		 508
509 /* Always check for received packets. */
510 sgiseeq_rx(dev, sp, hregs, sregs);
511
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);
515
516 if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) {
517 netif_wake_queue(dev);
518 }
519 spin_unlock(&sp->tx_lock);
520
521 return IRQ_HANDLED;
522}
523
524static int sgiseeq_open(struct net_device *dev)
525{
526 struct sgiseeq_private *sp = netdev_priv(dev);
527 struct sgiseeq_regs *sregs = sp->sregs;
528 unsigned int irq = dev->irq;
529 int err;
530
531 if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) {
532 printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq);
06d6e6d2 533 return -EAGAIN;
1da177e4
LT		 534 }
535
536 err = init_seeq(dev, sp, sregs);
537 if (err)
538 goto out_free_irq;
539
540 netif_start_queue(dev);
541
542 return 0;
543
544out_free_irq:
545 free_irq(irq, dev);
546
547 return err;
548}
549
550static int sgiseeq_close(struct net_device *dev)
551{
552 struct sgiseeq_private *sp = netdev_priv(dev);
553 struct sgiseeq_regs *sregs = sp->sregs;
2891439e 554 unsigned int irq = dev->irq;
1da177e4
LT		 555
556 netif_stop_queue(dev);
557
558 /* Shutdown the Seeq. */
559 reset_hpc3_and_seeq(sp->hregs, sregs);
2891439e 560 free_irq(irq, dev);
43831b15 561 seeq_purge_ring(dev);
1da177e4
LT		 562
563 return 0;
564}
565
566static inline int sgiseeq_reset(struct net_device *dev)
567{
568 struct sgiseeq_private *sp = netdev_priv(dev);
569 struct sgiseeq_regs *sregs = sp->sregs;
570 int err;
571
572 err = init_seeq(dev, sp, sregs);
573 if (err)
574 return err;
575
1ae5dc34 576 dev->trans_start = jiffies; /* prevent tx timeout */
1da177e4
LT		 577 netif_wake_queue(dev);
578
579 return 0;
580}
581
1da177e4
LT		 582static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev)
583{
584 struct sgiseeq_private *sp = netdev_priv(dev);
585 struct hpc3_ethregs *hregs = sp->hregs;
586 unsigned long flags;
587 struct sgiseeq_tx_desc *td;
43831b15 588 int len, entry;
1da177e4
LT		 589
590 spin_lock_irqsave(&sp->tx_lock, flags);
591
592 /* Setup... */
43831b15
TB		 593 len = skb->len;
594 if (len < ETH_ZLEN) {
ce6fbdef
JL		 595 if (skb_padto(skb, ETH_ZLEN)) {
596 spin_unlock_irqrestore(&sp->tx_lock, flags);
6ed10654 597 return NETDEV_TX_OK;
ce6fbdef 598 }
43831b15
TB		 599 len = ETH_ZLEN;
600 }
601
09f75cd7 602 dev->stats.tx_bytes += len;
1da177e4
LT		 603 entry = sp->tx_new;
604 td = &sp->tx_desc[entry];
49b11bc3 605 dma_sync_desc_cpu(dev, td);
1da177e4
LT		 606
607 /* Create entry. There are so many races with adding a new
608 * descriptor to the chain:
609 * 1) Assume that the HPC is off processing a DMA chain while
610 * we are changing all of the following.
611 * 2) Do no allow the HPC to look at a new descriptor until
612 * we have completely set up it's state. This means, do
613 * not clear HPCDMA_EOX in the current last descritptor
614 * until the one we are adding looks consistent and could
615 * be processes right now.
616 * 3) The tx interrupt code must notice when we've added a new
617 * entry and the HPC got to the end of the chain before we
618 * added this new entry and restarted it.
619 */
43831b15
TB		 620 td->skb = skb;
621 td->tdma.pbuf = dma_map_single(dev->dev.parent, skb->data,
622 len, DMA_TO_DEVICE);
1da177e4
LT		 623 td->tdma.cntinfo = (len & HPCDMA_BCNT) |
624 HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX;
49b11bc3 625 dma_sync_desc_dev(dev, td);
1da177e4
LT		 626 if (sp->tx_old != sp->tx_new) {
627 struct sgiseeq_tx_desc *backend;
628
629 backend = &sp->tx_desc[PREV_TX(sp->tx_new)];
49b11bc3 630 dma_sync_desc_cpu(dev, backend);
1da177e4 631 backend->tdma.cntinfo &= ~HPCDMA_EOX;
49b11bc3 632 dma_sync_desc_dev(dev, backend);
1da177e4
LT		 633 }
634 sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */
635
636 /* Maybe kick the HPC back into motion. */
637 if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE))
43831b15 638 kick_tx(dev, sp, hregs);
1da177e4 639
1da177e4
LT		 640 if (!TX_BUFFS_AVAIL(sp))
641 netif_stop_queue(dev);
642 spin_unlock_irqrestore(&sp->tx_lock, flags);
643
6ed10654 644 return NETDEV_TX_OK;
1da177e4
LT		 645}
646
647static void timeout(struct net_device *dev)
648{
649 printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name);
650 sgiseeq_reset(dev);
651
1ae5dc34 652 dev->trans_start = jiffies; /* prevent tx timeout */
1da177e4
LT		 653 netif_wake_queue(dev);
654}
655
1da177e4
LT		 656static void sgiseeq_set_multicast(struct net_device *dev)
657{
8f15ea42 658 struct sgiseeq_private *sp = netdev_priv(dev);
1da177e4
LT		 659 unsigned char oldmode = sp->mode;
660
661 if(dev->flags & IFF_PROMISC)
662 sp->mode = SEEQ_RCMD_RANY;
4cd24eaf 663 else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
1da177e4
LT		 664 sp->mode = SEEQ_RCMD_RBMCAST;
665 else
666 sp->mode = SEEQ_RCMD_RBCAST;
667
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.
670 */
671
672 if (oldmode != sp->mode)
673 sgiseeq_reset(dev);
674}
675
43831b15
TB		 676static inline void setup_tx_ring(struct net_device *dev,
677 struct sgiseeq_tx_desc *buf,
678 int nbufs)
1da177e4 679{
43831b15 680 struct sgiseeq_private *sp = netdev_priv(dev);
1da177e4
LT		 681 int i = 0;
682
683 while (i < (nbufs - 1)) {
43831b15 684 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
1da177e4 685 buf[i].tdma.pbuf = 0;
49b11bc3 686 dma_sync_desc_dev(dev, &buf[i]);
1da177e4
LT		 687 i++;
688 }
43831b15 689 buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf);
49b11bc3 690 dma_sync_desc_dev(dev, &buf[i]);
1da177e4
LT		 691}
692
43831b15
TB		 693static inline void setup_rx_ring(struct net_device *dev,
694 struct sgiseeq_rx_desc *buf,
695 int nbufs)
1da177e4 696{
43831b15 697 struct sgiseeq_private *sp = netdev_priv(dev);
1da177e4
LT		 698 int i = 0;
699
700 while (i < (nbufs - 1)) {
43831b15 701 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1);
1da177e4 702 buf[i].rdma.pbuf = 0;
49b11bc3 703 dma_sync_desc_dev(dev, &buf[i]);
1da177e4
LT		 704 i++;
705 }
706 buf[i].rdma.pbuf = 0;
43831b15 707 buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf);
49b11bc3 708 dma_sync_desc_dev(dev, &buf[i]);
1da177e4
LT		 709}
710
8c2c6be1
AB		 711static 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,
afc4b13d 716 .ndo_set_rx_mode = sgiseeq_set_multicast,
8c2c6be1
AB		 717 .ndo_set_mac_address = sgiseeq_set_mac_address,
718 .ndo_change_mtu = eth_change_mtu,
719 .ndo_validate_addr = eth_validate_addr,
720};
721
5911ce0d 722static int sgiseeq_probe(struct platform_device *pdev)
1da177e4 723{
df9f5408
RB		 724 struct sgiseeq_platform_data *pd = pdev->dev.platform_data;
725 struct hpc3_regs *hpcregs = pd->hpc;
1da177e4 726 struct sgiseeq_init_block *sr;
df9f5408 727 unsigned int irq = pd->irq;
1da177e4
LT		 728 struct sgiseeq_private *sp;
729 struct net_device *dev;
43831b15 730 int err;
1da177e4
LT		 731
732 dev = alloc_etherdev(sizeof (struct sgiseeq_private));
733 if (!dev) {
1da177e4
LT		 734 err = -ENOMEM;
735 goto err_out;
736 }
df9f5408
RB		 737
738 platform_set_drvdata(pdev, dev);
1da177e4
LT		 739 sp = netdev_priv(dev);
740
741 /* Make private data page aligned */
43831b15 742 sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings),
99cd149e 743 &sp->srings_dma, GFP_KERNEL);
1da177e4
LT		 744 if (!sr) {
745 printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n");
746 err = -ENOMEM;
747 goto err_out_free_dev;
748 }
749 sp->srings = sr;
99cd149e
RB		 750 sp->rx_desc = sp->srings->rxvector;
751 sp->tx_desc = sp->srings->txvector;
b8dfc6a0 752 spin_lock_init(&sp->tx_lock);
99cd149e
RB		 753
754 /* A couple calculations now, saves many cycles later. */
43831b15
TB		 755 setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS);
756 setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS);
1da177e4 757
df9f5408 758 memcpy(dev->dev_addr, pd->mac, ETH_ALEN);
1da177e4
LT		 759
760#ifdef DEBUG
761 gpriv = sp;
762 gdev = dev;
763#endif
302a5c4b
RB		 764 sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0];
765 sp->hregs = &hpcregs->ethregs;
1da177e4
LT		 766 sp->name = sgiseeqstr;
767 sp->mode = SEEQ_RCMD_RBCAST;
768
78ee5b3c
LM		 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;
773
302a5c4b
RB		 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;
778
1da177e4
LT		 779 /* Reset the chip. */
780 hpc3_eth_reset(sp->hregs);
781
782 sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff);
783 if (sp->is_edlc)
784 sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT |
785 SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT |
786 SEEQ_CTRL_ENCARR;
787
8c2c6be1 788 dev->netdev_ops = &sgiseeq_netdev_ops;
1da177e4 789 dev->watchdog_timeo = (200 * HZ) / 1000;
1da177e4
LT		 790 dev->irq = irq;
791
792 if (register_netdev(dev)) {
793 printk(KERN_ERR "Sgiseeq: Cannot register net device, "
794 "aborting.\n");
795 err = -ENODEV;
796 goto err_out_free_page;
797 }
798
e174961c 799 printk(KERN_INFO "%s: %s %pM\n", dev->name, sgiseeqstr, dev->dev_addr);
1da177e4 800
1da177e4
LT		 801 return 0;
802
803err_out_free_page:
2891439e 804 free_page((unsigned long) sp->srings);
1da177e4 805err_out_free_dev:
8d879de8 806 free_netdev(dev);
1da177e4
LT		 807
808err_out:
809 return err;
810}
811
e3efb054 812static int __exit sgiseeq_remove(struct platform_device *pdev)
1da177e4 813{
df9f5408
RB		 814 struct net_device *dev = platform_get_drvdata(pdev);
815 struct sgiseeq_private *sp = netdev_priv(dev);
78ee5b3c 816
df9f5408 817 unregister_netdev(dev);
43831b15
TB		 818 dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings,
819 sp->srings_dma);
df9f5408 820 free_netdev(dev);
e3efb054
RB		 821
822 return 0;
1da177e4
LT		 823}
824
df9f5408
RB		 825static struct platform_driver sgiseeq_driver = {
826 .probe = sgiseeq_probe,
fb74c2fc 827 .remove = __exit_p(sgiseeq_remove),
df9f5408 828 .driver = {
72abb461
KS		 829 .name = "sgiseeq",
830 .owner = THIS_MODULE,
df9f5408
RB		 831 }
832};
1da177e4 833
db62f684 834module_platform_driver(sgiseeq_driver);
1da177e4 835
302a5c4b
RB		 836MODULE_DESCRIPTION("SGI Seeq 8003 driver");
837MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>");
1da177e4 838MODULE_LICENSE("GPL");
72abb461 839MODULE_ALIAS("platform:sgiseeq");
Linux kernel - Deliverables
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