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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sgiseeq.c: Seeq8003 ethernet driver for SGI machines. | |
3 | * | |
4 | * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com) | |
5 | */ | |
6 | #include <linux/kernel.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/errno.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/ioport.h> | |
13 | #include <linux/socket.h> | |
14 | #include <linux/in.h> | |
15 | #include <linux/route.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/bitops.h> | |
23 | ||
24 | #include <asm/byteorder.h> | |
25 | #include <asm/io.h> | |
26 | #include <asm/system.h> | |
27 | #include <asm/page.h> | |
28 | #include <asm/pgtable.h> | |
29 | #include <asm/sgi/hpc3.h> | |
30 | #include <asm/sgi/ip22.h> | |
31 | #include <asm/sgialib.h> | |
32 | ||
33 | #include "sgiseeq.h" | |
34 | ||
35 | static char *version = "sgiseeq.c: David S. Miller (dm@engr.sgi.com)\n"; | |
36 | ||
37 | static char *sgiseeqstr = "SGI Seeq8003"; | |
38 | ||
39 | /* | |
40 | * If you want speed, you do something silly, it always has worked for me. So, | |
41 | * with that in mind, I've decided to make this driver look completely like a | |
42 | * stupid Lance from a driver architecture perspective. Only difference is that | |
43 | * here our "ring buffer" looks and acts like a real Lance one does but is | |
44 | * layed out like how the HPC DMA and the Seeq want it to. You'd be surprised | |
45 | * how a stupid idea like this can pay off in performance, not to mention | |
46 | * making this driver 2,000 times easier to write. ;-) | |
47 | */ | |
48 | ||
49 | /* Tune these if we tend to run out often etc. */ | |
50 | #define SEEQ_RX_BUFFERS 16 | |
51 | #define SEEQ_TX_BUFFERS 16 | |
52 | ||
53 | #define PKT_BUF_SZ 1584 | |
54 | ||
55 | #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1)) | |
56 | #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1)) | |
57 | #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1)) | |
58 | #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1)) | |
59 | ||
60 | #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \ | |
61 | sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \ | |
62 | sp->tx_old - sp->tx_new - 1) | |
63 | ||
64 | #define DEBUG | |
65 | ||
66 | struct sgiseeq_rx_desc { | |
67 | volatile struct hpc_dma_desc rdma; | |
68 | volatile signed int buf_vaddr; | |
69 | }; | |
70 | ||
71 | struct sgiseeq_tx_desc { | |
72 | volatile struct hpc_dma_desc tdma; | |
73 | volatile signed int buf_vaddr; | |
74 | }; | |
75 | ||
76 | /* | |
77 | * Warning: This structure is layed out in a certain way because HPC dma | |
78 | * descriptors must be 8-byte aligned. So don't touch this without | |
79 | * some care. | |
80 | */ | |
81 | struct sgiseeq_init_block { /* Note the name ;-) */ | |
82 | struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS]; | |
83 | struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS]; | |
84 | }; | |
85 | ||
86 | struct sgiseeq_private { | |
87 | struct sgiseeq_init_block *srings; | |
88 | ||
89 | /* Ptrs to the descriptors in uncached space. */ | |
90 | struct sgiseeq_rx_desc *rx_desc; | |
91 | struct sgiseeq_tx_desc *tx_desc; | |
92 | ||
93 | char *name; | |
94 | struct hpc3_ethregs *hregs; | |
95 | struct sgiseeq_regs *sregs; | |
96 | ||
97 | /* Ring entry counters. */ | |
98 | unsigned int rx_new, tx_new; | |
99 | unsigned int rx_old, tx_old; | |
100 | ||
101 | int is_edlc; | |
102 | unsigned char control; | |
103 | unsigned char mode; | |
104 | ||
105 | struct net_device_stats stats; | |
106 | ||
107 | struct net_device *next_module; | |
108 | spinlock_t tx_lock; | |
109 | }; | |
110 | ||
111 | /* A list of all installed seeq devices, for removing the driver module. */ | |
112 | static struct net_device *root_sgiseeq_dev; | |
113 | ||
114 | static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs) | |
115 | { | |
116 | hregs->rx_reset = HPC3_ERXRST_CRESET | HPC3_ERXRST_CLRIRQ; | |
117 | udelay(20); | |
118 | hregs->rx_reset = 0; | |
119 | } | |
120 | ||
121 | static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs, | |
122 | struct sgiseeq_regs *sregs) | |
123 | { | |
124 | hregs->rx_ctrl = hregs->tx_ctrl = 0; | |
125 | hpc3_eth_reset(hregs); | |
126 | } | |
127 | ||
128 | #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \ | |
129 | SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC) | |
130 | ||
131 | static inline void seeq_go(struct sgiseeq_private *sp, | |
132 | struct hpc3_ethregs *hregs, | |
133 | struct sgiseeq_regs *sregs) | |
134 | { | |
135 | sregs->rstat = sp->mode | RSTAT_GO_BITS; | |
136 | hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE; | |
137 | } | |
138 | ||
139 | static inline void __sgiseeq_set_mac_address(struct net_device *dev) | |
140 | { | |
141 | struct sgiseeq_private *sp = netdev_priv(dev); | |
142 | struct sgiseeq_regs *sregs = sp->sregs; | |
143 | int i; | |
144 | ||
145 | sregs->tstat = SEEQ_TCMD_RB0; | |
146 | for (i = 0; i < 6; i++) | |
147 | sregs->rw.eth_addr[i] = dev->dev_addr[i]; | |
148 | } | |
149 | ||
150 | static int sgiseeq_set_mac_address(struct net_device *dev, void *addr) | |
151 | { | |
152 | struct sgiseeq_private *sp = netdev_priv(dev); | |
153 | struct sockaddr *sa = addr; | |
154 | ||
155 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
156 | ||
157 | spin_lock_irq(&sp->tx_lock); | |
158 | __sgiseeq_set_mac_address(dev); | |
159 | spin_unlock_irq(&sp->tx_lock); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD) | |
165 | #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE) | |
166 | #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT)) | |
167 | ||
168 | static int seeq_init_ring(struct net_device *dev) | |
169 | { | |
170 | struct sgiseeq_private *sp = netdev_priv(dev); | |
171 | int i; | |
172 | ||
173 | netif_stop_queue(dev); | |
174 | sp->rx_new = sp->tx_new = 0; | |
175 | sp->rx_old = sp->tx_old = 0; | |
176 | ||
177 | __sgiseeq_set_mac_address(dev); | |
178 | ||
179 | /* Setup tx ring. */ | |
180 | for(i = 0; i < SEEQ_TX_BUFFERS; i++) { | |
181 | if (!sp->tx_desc[i].tdma.pbuf) { | |
182 | unsigned long buffer; | |
183 | ||
184 | buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL); | |
185 | if (!buffer) | |
186 | return -ENOMEM; | |
187 | sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer); | |
188 | sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer); | |
189 | } | |
190 | sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT; | |
191 | } | |
192 | ||
193 | /* And now the rx ring. */ | |
194 | for (i = 0; i < SEEQ_RX_BUFFERS; i++) { | |
195 | if (!sp->rx_desc[i].rdma.pbuf) { | |
196 | unsigned long buffer; | |
197 | ||
198 | buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL); | |
199 | if (!buffer) | |
200 | return -ENOMEM; | |
201 | sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer); | |
202 | sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer); | |
203 | } | |
204 | sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT; | |
205 | } | |
206 | sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR; | |
207 | return 0; | |
208 | } | |
209 | ||
210 | #ifdef DEBUG | |
211 | static struct sgiseeq_private *gpriv; | |
212 | static struct net_device *gdev; | |
213 | ||
214 | void sgiseeq_dump_rings(void) | |
215 | { | |
216 | static int once; | |
217 | struct sgiseeq_rx_desc *r = gpriv->rx_desc; | |
218 | struct sgiseeq_tx_desc *t = gpriv->tx_desc; | |
219 | struct hpc3_ethregs *hregs = gpriv->hregs; | |
220 | int i; | |
221 | ||
222 | if (once) | |
223 | return; | |
224 | once++; | |
225 | printk("RING DUMP:\n"); | |
226 | for (i = 0; i < SEEQ_RX_BUFFERS; i++) { | |
227 | printk("RX [%d]: @(%p) [%08x,%08x,%08x] ", | |
228 | i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, | |
229 | r[i].rdma.pnext); | |
230 | i += 1; | |
231 | printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", | |
232 | i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, | |
233 | r[i].rdma.pnext); | |
234 | } | |
235 | for (i = 0; i < SEEQ_TX_BUFFERS; i++) { | |
236 | printk("TX [%d]: @(%p) [%08x,%08x,%08x] ", | |
237 | i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, | |
238 | t[i].tdma.pnext); | |
239 | i += 1; | |
240 | printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", | |
241 | i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, | |
242 | t[i].tdma.pnext); | |
243 | } | |
244 | printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n", | |
245 | gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old); | |
246 | printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n", | |
247 | hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl); | |
248 | printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n", | |
249 | hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl); | |
250 | } | |
251 | #endif | |
252 | ||
253 | #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF) | |
254 | #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2) | |
255 | #define RDMACFG_INIT (HPC3_ERXDCFG_FRXDC | HPC3_ERXDCFG_FEOP | HPC3_ERXDCFG_FIRQ) | |
256 | ||
257 | static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp, | |
258 | struct sgiseeq_regs *sregs) | |
259 | { | |
260 | struct hpc3_ethregs *hregs = sp->hregs; | |
261 | int err; | |
262 | ||
263 | reset_hpc3_and_seeq(hregs, sregs); | |
264 | err = seeq_init_ring(dev); | |
265 | if (err) | |
266 | return err; | |
267 | ||
268 | /* Setup to field the proper interrupt types. */ | |
269 | if (sp->is_edlc) { | |
270 | sregs->tstat = TSTAT_INIT_EDLC; | |
271 | sregs->rw.wregs.control = sp->control; | |
272 | sregs->rw.wregs.frame_gap = 0; | |
273 | } else { | |
274 | sregs->tstat = TSTAT_INIT_SEEQ; | |
275 | } | |
276 | ||
277 | hregs->rx_dconfig |= RDMACFG_INIT; | |
278 | ||
279 | hregs->rx_ndptr = CPHYSADDR(sp->rx_desc); | |
280 | hregs->tx_ndptr = CPHYSADDR(sp->tx_desc); | |
281 | ||
282 | seeq_go(sp, hregs, sregs); | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static inline void record_rx_errors(struct sgiseeq_private *sp, | |
287 | unsigned char status) | |
288 | { | |
289 | if (status & SEEQ_RSTAT_OVERF || | |
290 | status & SEEQ_RSTAT_SFRAME) | |
291 | sp->stats.rx_over_errors++; | |
292 | if (status & SEEQ_RSTAT_CERROR) | |
293 | sp->stats.rx_crc_errors++; | |
294 | if (status & SEEQ_RSTAT_DERROR) | |
295 | sp->stats.rx_frame_errors++; | |
296 | if (status & SEEQ_RSTAT_REOF) | |
297 | sp->stats.rx_errors++; | |
298 | } | |
299 | ||
300 | static inline void rx_maybe_restart(struct sgiseeq_private *sp, | |
301 | struct hpc3_ethregs *hregs, | |
302 | struct sgiseeq_regs *sregs) | |
303 | { | |
304 | if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) { | |
305 | hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new); | |
306 | seeq_go(sp, hregs, sregs); | |
307 | } | |
308 | } | |
309 | ||
310 | #define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \ | |
311 | !((rd)->rdma.cntinfo & HPCDMA_OWN); \ | |
312 | (rd) = &(sp)->rx_desc[(sp)->rx_new]) | |
313 | ||
314 | static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp, | |
315 | struct hpc3_ethregs *hregs, | |
316 | struct sgiseeq_regs *sregs) | |
317 | { | |
318 | struct sgiseeq_rx_desc *rd; | |
319 | struct sk_buff *skb = 0; | |
320 | unsigned char pkt_status; | |
321 | unsigned char *pkt_pointer = 0; | |
322 | int len = 0; | |
323 | unsigned int orig_end = PREV_RX(sp->rx_new); | |
324 | ||
325 | /* Service every received packet. */ | |
326 | for_each_rx(rd, sp) { | |
327 | len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3; | |
328 | pkt_pointer = (unsigned char *)(long)rd->buf_vaddr; | |
329 | pkt_status = pkt_pointer[len + 2]; | |
330 | ||
331 | if (pkt_status & SEEQ_RSTAT_FIG) { | |
332 | /* Packet is OK. */ | |
333 | skb = dev_alloc_skb(len + 2); | |
334 | ||
335 | if (skb) { | |
336 | skb->dev = dev; | |
337 | skb_reserve(skb, 2); | |
338 | skb_put(skb, len); | |
339 | ||
340 | /* Copy out of kseg1 to avoid silly cache flush. */ | |
341 | eth_copy_and_sum(skb, pkt_pointer + 2, len, 0); | |
342 | skb->protocol = eth_type_trans(skb, dev); | |
343 | ||
344 | /* We don't want to receive our own packets */ | |
345 | if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) { | |
346 | netif_rx(skb); | |
347 | dev->last_rx = jiffies; | |
348 | sp->stats.rx_packets++; | |
349 | sp->stats.rx_bytes += len; | |
350 | } else { | |
351 | /* Silently drop my own packets */ | |
352 | dev_kfree_skb_irq(skb); | |
353 | } | |
354 | } else { | |
355 | printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n", | |
356 | dev->name); | |
357 | sp->stats.rx_dropped++; | |
358 | } | |
359 | } else { | |
360 | record_rx_errors(sp, pkt_status); | |
361 | } | |
362 | ||
363 | /* Return the entry to the ring pool. */ | |
364 | rd->rdma.cntinfo = RCNTINFO_INIT; | |
365 | sp->rx_new = NEXT_RX(sp->rx_new); | |
366 | } | |
367 | sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR); | |
368 | sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR; | |
369 | rx_maybe_restart(sp, hregs, sregs); | |
370 | } | |
371 | ||
372 | static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp, | |
373 | struct sgiseeq_regs *sregs) | |
374 | { | |
375 | if (sp->is_edlc) { | |
376 | sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT); | |
377 | sregs->rw.wregs.control = sp->control; | |
378 | } | |
379 | } | |
380 | ||
381 | static inline void kick_tx(struct sgiseeq_tx_desc *td, | |
382 | struct hpc3_ethregs *hregs) | |
383 | { | |
384 | /* If the HPC aint doin nothin, and there are more packets | |
385 | * with ETXD cleared and XIU set we must make very certain | |
386 | * that we restart the HPC else we risk locking up the | |
387 | * adapter. The following code is only safe iff the HPCDMA | |
388 | * is not active! | |
389 | */ | |
390 | while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) == | |
391 | (HPCDMA_XIU | HPCDMA_ETXD)) | |
392 | td = (struct sgiseeq_tx_desc *)(long) CKSEG1ADDR(td->tdma.pnext); | |
393 | if (td->tdma.cntinfo & HPCDMA_XIU) { | |
394 | hregs->tx_ndptr = CPHYSADDR(td); | |
395 | hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; | |
396 | } | |
397 | } | |
398 | ||
399 | static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp, | |
400 | struct hpc3_ethregs *hregs, | |
401 | struct sgiseeq_regs *sregs) | |
402 | { | |
403 | struct sgiseeq_tx_desc *td; | |
404 | unsigned long status = hregs->tx_ctrl; | |
405 | int j; | |
406 | ||
407 | tx_maybe_reset_collisions(sp, sregs); | |
408 | ||
409 | if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) { | |
410 | /* Oops, HPC detected some sort of error. */ | |
411 | if (status & SEEQ_TSTAT_R16) | |
412 | sp->stats.tx_aborted_errors++; | |
413 | if (status & SEEQ_TSTAT_UFLOW) | |
414 | sp->stats.tx_fifo_errors++; | |
415 | if (status & SEEQ_TSTAT_LCLS) | |
416 | sp->stats.collisions++; | |
417 | } | |
418 | ||
419 | /* Ack 'em... */ | |
420 | for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) { | |
421 | td = &sp->tx_desc[j]; | |
422 | ||
423 | if (!(td->tdma.cntinfo & (HPCDMA_XIU))) | |
424 | break; | |
425 | if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) { | |
426 | if (!(status & HPC3_ETXCTRL_ACTIVE)) { | |
427 | hregs->tx_ndptr = CPHYSADDR(td); | |
428 | hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; | |
429 | } | |
430 | break; | |
431 | } | |
432 | sp->stats.tx_packets++; | |
433 | sp->tx_old = NEXT_TX(sp->tx_old); | |
434 | td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE); | |
435 | td->tdma.cntinfo |= HPCDMA_EOX; | |
436 | } | |
437 | } | |
438 | ||
439 | static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
440 | { | |
441 | struct net_device *dev = (struct net_device *) dev_id; | |
442 | struct sgiseeq_private *sp = netdev_priv(dev); | |
443 | struct hpc3_ethregs *hregs = sp->hregs; | |
444 | struct sgiseeq_regs *sregs = sp->sregs; | |
445 | ||
446 | spin_lock(&sp->tx_lock); | |
447 | ||
448 | /* Ack the IRQ and set software state. */ | |
449 | hregs->rx_reset = HPC3_ERXRST_CLRIRQ; | |
450 | ||
451 | /* Always check for received packets. */ | |
452 | sgiseeq_rx(dev, sp, hregs, sregs); | |
453 | ||
454 | /* Only check for tx acks if we have something queued. */ | |
455 | if (sp->tx_old != sp->tx_new) | |
456 | sgiseeq_tx(dev, sp, hregs, sregs); | |
457 | ||
458 | if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) { | |
459 | netif_wake_queue(dev); | |
460 | } | |
461 | spin_unlock(&sp->tx_lock); | |
462 | ||
463 | return IRQ_HANDLED; | |
464 | } | |
465 | ||
466 | static int sgiseeq_open(struct net_device *dev) | |
467 | { | |
468 | struct sgiseeq_private *sp = netdev_priv(dev); | |
469 | struct sgiseeq_regs *sregs = sp->sregs; | |
470 | unsigned int irq = dev->irq; | |
471 | int err; | |
472 | ||
473 | if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) { | |
474 | printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq); | |
475 | err = -EAGAIN; | |
476 | } | |
477 | ||
478 | err = init_seeq(dev, sp, sregs); | |
479 | if (err) | |
480 | goto out_free_irq; | |
481 | ||
482 | netif_start_queue(dev); | |
483 | ||
484 | return 0; | |
485 | ||
486 | out_free_irq: | |
487 | free_irq(irq, dev); | |
488 | ||
489 | return err; | |
490 | } | |
491 | ||
492 | static int sgiseeq_close(struct net_device *dev) | |
493 | { | |
494 | struct sgiseeq_private *sp = netdev_priv(dev); | |
495 | struct sgiseeq_regs *sregs = sp->sregs; | |
2891439e | 496 | unsigned int irq = dev->irq; |
1da177e4 LT |
497 | |
498 | netif_stop_queue(dev); | |
499 | ||
500 | /* Shutdown the Seeq. */ | |
501 | reset_hpc3_and_seeq(sp->hregs, sregs); | |
2891439e | 502 | free_irq(irq, dev); |
1da177e4 LT |
503 | |
504 | return 0; | |
505 | } | |
506 | ||
507 | static inline int sgiseeq_reset(struct net_device *dev) | |
508 | { | |
509 | struct sgiseeq_private *sp = netdev_priv(dev); | |
510 | struct sgiseeq_regs *sregs = sp->sregs; | |
511 | int err; | |
512 | ||
513 | err = init_seeq(dev, sp, sregs); | |
514 | if (err) | |
515 | return err; | |
516 | ||
517 | dev->trans_start = jiffies; | |
518 | netif_wake_queue(dev); | |
519 | ||
520 | return 0; | |
521 | } | |
522 | ||
523 | void sgiseeq_my_reset(void) | |
524 | { | |
525 | printk("RESET!\n"); | |
526 | sgiseeq_reset(gdev); | |
527 | } | |
528 | ||
529 | static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
530 | { | |
531 | struct sgiseeq_private *sp = netdev_priv(dev); | |
532 | struct hpc3_ethregs *hregs = sp->hregs; | |
533 | unsigned long flags; | |
534 | struct sgiseeq_tx_desc *td; | |
535 | int skblen, len, entry; | |
536 | ||
537 | spin_lock_irqsave(&sp->tx_lock, flags); | |
538 | ||
539 | /* Setup... */ | |
540 | skblen = skb->len; | |
541 | len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen; | |
542 | sp->stats.tx_bytes += len; | |
543 | entry = sp->tx_new; | |
544 | td = &sp->tx_desc[entry]; | |
545 | ||
546 | /* Create entry. There are so many races with adding a new | |
547 | * descriptor to the chain: | |
548 | * 1) Assume that the HPC is off processing a DMA chain while | |
549 | * we are changing all of the following. | |
550 | * 2) Do no allow the HPC to look at a new descriptor until | |
551 | * we have completely set up it's state. This means, do | |
552 | * not clear HPCDMA_EOX in the current last descritptor | |
553 | * until the one we are adding looks consistent and could | |
554 | * be processes right now. | |
555 | * 3) The tx interrupt code must notice when we've added a new | |
556 | * entry and the HPC got to the end of the chain before we | |
557 | * added this new entry and restarted it. | |
558 | */ | |
559 | memcpy((char *)(long)td->buf_vaddr, skb->data, skblen); | |
560 | if (len != skblen) | |
561 | memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen); | |
562 | td->tdma.cntinfo = (len & HPCDMA_BCNT) | | |
563 | HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX; | |
564 | if (sp->tx_old != sp->tx_new) { | |
565 | struct sgiseeq_tx_desc *backend; | |
566 | ||
567 | backend = &sp->tx_desc[PREV_TX(sp->tx_new)]; | |
568 | backend->tdma.cntinfo &= ~HPCDMA_EOX; | |
569 | } | |
570 | sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */ | |
571 | ||
572 | /* Maybe kick the HPC back into motion. */ | |
573 | if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE)) | |
574 | kick_tx(&sp->tx_desc[sp->tx_old], hregs); | |
575 | ||
576 | dev->trans_start = jiffies; | |
577 | dev_kfree_skb(skb); | |
578 | ||
579 | if (!TX_BUFFS_AVAIL(sp)) | |
580 | netif_stop_queue(dev); | |
581 | spin_unlock_irqrestore(&sp->tx_lock, flags); | |
582 | ||
583 | return 0; | |
584 | } | |
585 | ||
586 | static void timeout(struct net_device *dev) | |
587 | { | |
588 | printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name); | |
589 | sgiseeq_reset(dev); | |
590 | ||
591 | dev->trans_start = jiffies; | |
592 | netif_wake_queue(dev); | |
593 | } | |
594 | ||
595 | static struct net_device_stats *sgiseeq_get_stats(struct net_device *dev) | |
596 | { | |
597 | struct sgiseeq_private *sp = netdev_priv(dev); | |
598 | ||
599 | return &sp->stats; | |
600 | } | |
601 | ||
602 | static void sgiseeq_set_multicast(struct net_device *dev) | |
603 | { | |
604 | struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv; | |
605 | unsigned char oldmode = sp->mode; | |
606 | ||
607 | if(dev->flags & IFF_PROMISC) | |
608 | sp->mode = SEEQ_RCMD_RANY; | |
609 | else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count) | |
610 | sp->mode = SEEQ_RCMD_RBMCAST; | |
611 | else | |
612 | sp->mode = SEEQ_RCMD_RBCAST; | |
613 | ||
614 | /* XXX I know this sucks, but is there a better way to reprogram | |
615 | * XXX the receiver? At least, this shouldn't happen too often. | |
616 | */ | |
617 | ||
618 | if (oldmode != sp->mode) | |
619 | sgiseeq_reset(dev); | |
620 | } | |
621 | ||
622 | static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs) | |
623 | { | |
624 | int i = 0; | |
625 | ||
626 | while (i < (nbufs - 1)) { | |
627 | buf[i].tdma.pnext = CPHYSADDR(buf + i + 1); | |
628 | buf[i].tdma.pbuf = 0; | |
629 | i++; | |
630 | } | |
631 | buf[i].tdma.pnext = CPHYSADDR(buf); | |
632 | } | |
633 | ||
634 | static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs) | |
635 | { | |
636 | int i = 0; | |
637 | ||
638 | while (i < (nbufs - 1)) { | |
639 | buf[i].rdma.pnext = CPHYSADDR(buf + i + 1); | |
640 | buf[i].rdma.pbuf = 0; | |
641 | i++; | |
642 | } | |
643 | buf[i].rdma.pbuf = 0; | |
644 | buf[i].rdma.pnext = CPHYSADDR(buf); | |
645 | } | |
646 | ||
647 | #define ALIGNED(x) ((((unsigned long)(x)) + 0xf) & ~(0xf)) | |
648 | ||
649 | static int sgiseeq_init(struct hpc3_regs* regs, int irq) | |
650 | { | |
651 | struct sgiseeq_init_block *sr; | |
652 | struct sgiseeq_private *sp; | |
653 | struct net_device *dev; | |
654 | int err, i; | |
655 | ||
656 | dev = alloc_etherdev(sizeof (struct sgiseeq_private)); | |
657 | if (!dev) { | |
658 | printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n"); | |
659 | err = -ENOMEM; | |
660 | goto err_out; | |
661 | } | |
662 | sp = netdev_priv(dev); | |
663 | ||
664 | /* Make private data page aligned */ | |
665 | sr = (struct sgiseeq_init_block *) get_zeroed_page(GFP_KERNEL); | |
666 | if (!sr) { | |
667 | printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n"); | |
668 | err = -ENOMEM; | |
669 | goto err_out_free_dev; | |
670 | } | |
671 | sp->srings = sr; | |
672 | ||
673 | #define EADDR_NVOFS 250 | |
674 | for (i = 0; i < 3; i++) { | |
675 | unsigned short tmp = ip22_nvram_read(EADDR_NVOFS / 2 + i); | |
676 | ||
677 | dev->dev_addr[2 * i] = tmp >> 8; | |
678 | dev->dev_addr[2 * i + 1] = tmp & 0xff; | |
679 | } | |
680 | ||
681 | #ifdef DEBUG | |
682 | gpriv = sp; | |
683 | gdev = dev; | |
684 | #endif | |
685 | sp->sregs = (struct sgiseeq_regs *) &hpc3c0->eth_ext[0]; | |
686 | sp->hregs = &hpc3c0->ethregs; | |
687 | sp->name = sgiseeqstr; | |
688 | sp->mode = SEEQ_RCMD_RBCAST; | |
689 | ||
690 | sp->rx_desc = (struct sgiseeq_rx_desc *) | |
691 | CKSEG1ADDR(ALIGNED(&sp->srings->rxvector[0])); | |
692 | dma_cache_wback_inv((unsigned long)&sp->srings->rxvector, | |
693 | sizeof(sp->srings->rxvector)); | |
694 | sp->tx_desc = (struct sgiseeq_tx_desc *) | |
695 | CKSEG1ADDR(ALIGNED(&sp->srings->txvector[0])); | |
696 | dma_cache_wback_inv((unsigned long)&sp->srings->txvector, | |
697 | sizeof(sp->srings->txvector)); | |
698 | ||
699 | /* A couple calculations now, saves many cycles later. */ | |
700 | setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS); | |
701 | setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS); | |
702 | ||
703 | /* Reset the chip. */ | |
704 | hpc3_eth_reset(sp->hregs); | |
705 | ||
706 | sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff); | |
707 | if (sp->is_edlc) | |
708 | sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT | | |
709 | SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT | | |
710 | SEEQ_CTRL_ENCARR; | |
711 | ||
712 | dev->open = sgiseeq_open; | |
713 | dev->stop = sgiseeq_close; | |
714 | dev->hard_start_xmit = sgiseeq_start_xmit; | |
715 | dev->tx_timeout = timeout; | |
716 | dev->watchdog_timeo = (200 * HZ) / 1000; | |
717 | dev->get_stats = sgiseeq_get_stats; | |
718 | dev->set_multicast_list = sgiseeq_set_multicast; | |
719 | dev->set_mac_address = sgiseeq_set_mac_address; | |
720 | dev->irq = irq; | |
721 | ||
722 | if (register_netdev(dev)) { | |
723 | printk(KERN_ERR "Sgiseeq: Cannot register net device, " | |
724 | "aborting.\n"); | |
725 | err = -ENODEV; | |
726 | goto err_out_free_page; | |
727 | } | |
728 | ||
729 | printk(KERN_INFO "%s: SGI Seeq8003 ", dev->name); | |
730 | for (i = 0; i < 6; i++) | |
731 | printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':'); | |
732 | ||
733 | sp->next_module = root_sgiseeq_dev; | |
734 | root_sgiseeq_dev = dev; | |
735 | ||
736 | return 0; | |
737 | ||
738 | err_out_free_page: | |
2891439e | 739 | free_page((unsigned long) sp->srings); |
1da177e4 LT |
740 | err_out_free_dev: |
741 | kfree(dev); | |
742 | ||
743 | err_out: | |
744 | return err; | |
745 | } | |
746 | ||
747 | static int __init sgiseeq_probe(void) | |
748 | { | |
749 | printk(version); | |
750 | ||
751 | /* On board adapter on 1st HPC is always present */ | |
752 | return sgiseeq_init(hpc3c0, SGI_ENET_IRQ); | |
753 | } | |
754 | ||
755 | static void __exit sgiseeq_exit(void) | |
756 | { | |
757 | struct net_device *next, *dev; | |
758 | struct sgiseeq_private *sp; | |
1da177e4 LT |
759 | |
760 | for (dev = root_sgiseeq_dev; dev; dev = next) { | |
761 | sp = (struct sgiseeq_private *) netdev_priv(dev); | |
762 | next = sp->next_module; | |
1da177e4 | 763 | unregister_netdev(dev); |
2891439e | 764 | free_page((unsigned long) sp->srings); |
1da177e4 LT |
765 | free_netdev(dev); |
766 | } | |
767 | } | |
768 | ||
769 | module_init(sgiseeq_probe); | |
770 | module_exit(sgiseeq_exit); | |
771 | ||
772 | MODULE_LICENSE("GPL"); |