Commit | Line | Data |
---|---|---|
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 | */ | |
a4d4d518 RB |
6 | |
7 | #undef DEBUG | |
8 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
15 | #include <linux/slab.h> |
16 | #include <linux/string.h> | |
17 | #include <linux/delay.h> | |
18 | #include <linux/netdevice.h> | |
df9f5408 | 19 | #include <linux/platform_device.h> |
1da177e4 LT |
20 | #include <linux/etherdevice.h> |
21 | #include <linux/skbuff.h> | |
1da177e4 | 22 | |
1da177e4 LT |
23 | #include <asm/sgi/hpc3.h> |
24 | #include <asm/sgi/ip22.h> | |
df9f5408 | 25 | #include <asm/sgi/seeq.h> |
1da177e4 LT |
26 | |
27 | #include "sgiseeq.h" | |
28 | ||
1da177e4 LT |
29 | static char *sgiseeqstr = "SGI Seeq8003"; |
30 | ||
31 | /* | |
32 | * If you want speed, you do something silly, it always has worked for me. So, | |
33 | * with that in mind, I've decided to make this driver look completely like a | |
34 | * stupid Lance from a driver architecture perspective. Only difference is that | |
35 | * here our "ring buffer" looks and acts like a real Lance one does but is | |
36 | * layed out like how the HPC DMA and the Seeq want it to. You'd be surprised | |
37 | * how a stupid idea like this can pay off in performance, not to mention | |
38 | * making this driver 2,000 times easier to write. ;-) | |
39 | */ | |
40 | ||
41 | /* Tune these if we tend to run out often etc. */ | |
42 | #define SEEQ_RX_BUFFERS 16 | |
43 | #define SEEQ_TX_BUFFERS 16 | |
44 | ||
45 | #define PKT_BUF_SZ 1584 | |
46 | ||
47 | #define NEXT_RX(i) (((i) + 1) & (SEEQ_RX_BUFFERS - 1)) | |
48 | #define NEXT_TX(i) (((i) + 1) & (SEEQ_TX_BUFFERS - 1)) | |
49 | #define PREV_RX(i) (((i) - 1) & (SEEQ_RX_BUFFERS - 1)) | |
50 | #define PREV_TX(i) (((i) - 1) & (SEEQ_TX_BUFFERS - 1)) | |
51 | ||
52 | #define TX_BUFFS_AVAIL(sp) ((sp->tx_old <= sp->tx_new) ? \ | |
53 | sp->tx_old + (SEEQ_TX_BUFFERS - 1) - sp->tx_new : \ | |
54 | sp->tx_old - sp->tx_new - 1) | |
55 | ||
1da177e4 LT |
56 | struct sgiseeq_rx_desc { |
57 | volatile struct hpc_dma_desc rdma; | |
58 | volatile signed int buf_vaddr; | |
59 | }; | |
60 | ||
61 | struct sgiseeq_tx_desc { | |
62 | volatile struct hpc_dma_desc tdma; | |
63 | volatile signed int buf_vaddr; | |
64 | }; | |
65 | ||
66 | /* | |
67 | * Warning: This structure is layed out in a certain way because HPC dma | |
68 | * descriptors must be 8-byte aligned. So don't touch this without | |
69 | * some care. | |
70 | */ | |
71 | struct sgiseeq_init_block { /* Note the name ;-) */ | |
72 | struct sgiseeq_rx_desc rxvector[SEEQ_RX_BUFFERS]; | |
73 | struct sgiseeq_tx_desc txvector[SEEQ_TX_BUFFERS]; | |
74 | }; | |
75 | ||
76 | struct sgiseeq_private { | |
77 | struct sgiseeq_init_block *srings; | |
99cd149e | 78 | dma_addr_t srings_dma; |
1da177e4 LT |
79 | |
80 | /* Ptrs to the descriptors in uncached space. */ | |
81 | struct sgiseeq_rx_desc *rx_desc; | |
82 | struct sgiseeq_tx_desc *tx_desc; | |
83 | ||
84 | char *name; | |
85 | struct hpc3_ethregs *hregs; | |
86 | struct sgiseeq_regs *sregs; | |
87 | ||
88 | /* Ring entry counters. */ | |
89 | unsigned int rx_new, tx_new; | |
90 | unsigned int rx_old, tx_old; | |
91 | ||
92 | int is_edlc; | |
93 | unsigned char control; | |
94 | unsigned char mode; | |
95 | ||
1da177e4 LT |
96 | spinlock_t tx_lock; |
97 | }; | |
98 | ||
1da177e4 LT |
99 | static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs) |
100 | { | |
302a5c4b | 101 | hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ; |
1da177e4 | 102 | udelay(20); |
302a5c4b | 103 | hregs->reset = 0; |
1da177e4 LT |
104 | } |
105 | ||
106 | static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs, | |
107 | struct sgiseeq_regs *sregs) | |
108 | { | |
109 | hregs->rx_ctrl = hregs->tx_ctrl = 0; | |
110 | hpc3_eth_reset(hregs); | |
111 | } | |
112 | ||
113 | #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \ | |
114 | SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC) | |
115 | ||
116 | static inline void seeq_go(struct sgiseeq_private *sp, | |
117 | struct hpc3_ethregs *hregs, | |
118 | struct sgiseeq_regs *sregs) | |
119 | { | |
120 | sregs->rstat = sp->mode | RSTAT_GO_BITS; | |
121 | hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE; | |
122 | } | |
123 | ||
124 | static inline void __sgiseeq_set_mac_address(struct net_device *dev) | |
125 | { | |
126 | struct sgiseeq_private *sp = netdev_priv(dev); | |
127 | struct sgiseeq_regs *sregs = sp->sregs; | |
128 | int i; | |
129 | ||
130 | sregs->tstat = SEEQ_TCMD_RB0; | |
131 | for (i = 0; i < 6; i++) | |
132 | sregs->rw.eth_addr[i] = dev->dev_addr[i]; | |
133 | } | |
134 | ||
135 | static int sgiseeq_set_mac_address(struct net_device *dev, void *addr) | |
136 | { | |
137 | struct sgiseeq_private *sp = netdev_priv(dev); | |
138 | struct sockaddr *sa = addr; | |
139 | ||
140 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
141 | ||
142 | spin_lock_irq(&sp->tx_lock); | |
143 | __sgiseeq_set_mac_address(dev); | |
144 | spin_unlock_irq(&sp->tx_lock); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | #define TCNTINFO_INIT (HPCDMA_EOX | HPCDMA_ETXD) | |
150 | #define RCNTCFG_INIT (HPCDMA_OWN | HPCDMA_EORP | HPCDMA_XIE) | |
151 | #define RCNTINFO_INIT (RCNTCFG_INIT | (PKT_BUF_SZ & HPCDMA_BCNT)) | |
152 | ||
153 | static int seeq_init_ring(struct net_device *dev) | |
154 | { | |
155 | struct sgiseeq_private *sp = netdev_priv(dev); | |
156 | int i; | |
157 | ||
158 | netif_stop_queue(dev); | |
159 | sp->rx_new = sp->tx_new = 0; | |
160 | sp->rx_old = sp->tx_old = 0; | |
161 | ||
162 | __sgiseeq_set_mac_address(dev); | |
163 | ||
164 | /* Setup tx ring. */ | |
165 | for(i = 0; i < SEEQ_TX_BUFFERS; i++) { | |
166 | if (!sp->tx_desc[i].tdma.pbuf) { | |
167 | unsigned long buffer; | |
168 | ||
169 | buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL); | |
170 | if (!buffer) | |
171 | return -ENOMEM; | |
172 | sp->tx_desc[i].buf_vaddr = CKSEG1ADDR(buffer); | |
173 | sp->tx_desc[i].tdma.pbuf = CPHYSADDR(buffer); | |
174 | } | |
175 | sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT; | |
176 | } | |
177 | ||
178 | /* And now the rx ring. */ | |
179 | for (i = 0; i < SEEQ_RX_BUFFERS; i++) { | |
180 | if (!sp->rx_desc[i].rdma.pbuf) { | |
181 | unsigned long buffer; | |
182 | ||
183 | buffer = (unsigned long) kmalloc(PKT_BUF_SZ, GFP_KERNEL); | |
184 | if (!buffer) | |
185 | return -ENOMEM; | |
186 | sp->rx_desc[i].buf_vaddr = CKSEG1ADDR(buffer); | |
187 | sp->rx_desc[i].rdma.pbuf = CPHYSADDR(buffer); | |
188 | } | |
189 | sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT; | |
190 | } | |
191 | sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR; | |
192 | return 0; | |
193 | } | |
194 | ||
195 | #ifdef DEBUG | |
196 | static struct sgiseeq_private *gpriv; | |
197 | static struct net_device *gdev; | |
198 | ||
a4d4d518 | 199 | static void sgiseeq_dump_rings(void) |
1da177e4 LT |
200 | { |
201 | static int once; | |
202 | struct sgiseeq_rx_desc *r = gpriv->rx_desc; | |
203 | struct sgiseeq_tx_desc *t = gpriv->tx_desc; | |
204 | struct hpc3_ethregs *hregs = gpriv->hregs; | |
205 | int i; | |
206 | ||
207 | if (once) | |
208 | return; | |
209 | once++; | |
210 | printk("RING DUMP:\n"); | |
211 | for (i = 0; i < SEEQ_RX_BUFFERS; i++) { | |
212 | printk("RX [%d]: @(%p) [%08x,%08x,%08x] ", | |
213 | i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, | |
214 | r[i].rdma.pnext); | |
215 | i += 1; | |
216 | printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", | |
217 | i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, | |
218 | r[i].rdma.pnext); | |
219 | } | |
220 | for (i = 0; i < SEEQ_TX_BUFFERS; i++) { | |
221 | printk("TX [%d]: @(%p) [%08x,%08x,%08x] ", | |
222 | i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, | |
223 | t[i].tdma.pnext); | |
224 | i += 1; | |
225 | printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", | |
226 | i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, | |
227 | t[i].tdma.pnext); | |
228 | } | |
229 | printk("INFO: [rx_new = %d rx_old=%d] [tx_new = %d tx_old = %d]\n", | |
230 | gpriv->rx_new, gpriv->rx_old, gpriv->tx_new, gpriv->tx_old); | |
231 | printk("RREGS: rx_cbptr[%08x] rx_ndptr[%08x] rx_ctrl[%08x]\n", | |
232 | hregs->rx_cbptr, hregs->rx_ndptr, hregs->rx_ctrl); | |
233 | printk("TREGS: tx_cbptr[%08x] tx_ndptr[%08x] tx_ctrl[%08x]\n", | |
234 | hregs->tx_cbptr, hregs->tx_ndptr, hregs->tx_ctrl); | |
235 | } | |
236 | #endif | |
237 | ||
238 | #define TSTAT_INIT_SEEQ (SEEQ_TCMD_IPT|SEEQ_TCMD_I16|SEEQ_TCMD_IC|SEEQ_TCMD_IUF) | |
239 | #define TSTAT_INIT_EDLC ((TSTAT_INIT_SEEQ) | SEEQ_TCMD_RB2) | |
1da177e4 LT |
240 | |
241 | static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp, | |
242 | struct sgiseeq_regs *sregs) | |
243 | { | |
244 | struct hpc3_ethregs *hregs = sp->hregs; | |
245 | int err; | |
246 | ||
247 | reset_hpc3_and_seeq(hregs, sregs); | |
248 | err = seeq_init_ring(dev); | |
249 | if (err) | |
250 | return err; | |
251 | ||
252 | /* Setup to field the proper interrupt types. */ | |
253 | if (sp->is_edlc) { | |
254 | sregs->tstat = TSTAT_INIT_EDLC; | |
255 | sregs->rw.wregs.control = sp->control; | |
256 | sregs->rw.wregs.frame_gap = 0; | |
257 | } else { | |
258 | sregs->tstat = TSTAT_INIT_SEEQ; | |
259 | } | |
260 | ||
1da177e4 LT |
261 | hregs->rx_ndptr = CPHYSADDR(sp->rx_desc); |
262 | hregs->tx_ndptr = CPHYSADDR(sp->tx_desc); | |
263 | ||
264 | seeq_go(sp, hregs, sregs); | |
265 | return 0; | |
266 | } | |
267 | ||
09f75cd7 | 268 | static void record_rx_errors(struct net_device *dev, unsigned char status) |
1da177e4 LT |
269 | { |
270 | if (status & SEEQ_RSTAT_OVERF || | |
271 | status & SEEQ_RSTAT_SFRAME) | |
09f75cd7 | 272 | dev->stats.rx_over_errors++; |
1da177e4 | 273 | if (status & SEEQ_RSTAT_CERROR) |
09f75cd7 | 274 | dev->stats.rx_crc_errors++; |
1da177e4 | 275 | if (status & SEEQ_RSTAT_DERROR) |
09f75cd7 | 276 | dev->stats.rx_frame_errors++; |
1da177e4 | 277 | if (status & SEEQ_RSTAT_REOF) |
09f75cd7 | 278 | dev->stats.rx_errors++; |
1da177e4 LT |
279 | } |
280 | ||
281 | static inline void rx_maybe_restart(struct sgiseeq_private *sp, | |
282 | struct hpc3_ethregs *hregs, | |
283 | struct sgiseeq_regs *sregs) | |
284 | { | |
285 | if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) { | |
286 | hregs->rx_ndptr = CPHYSADDR(sp->rx_desc + sp->rx_new); | |
287 | seeq_go(sp, hregs, sregs); | |
288 | } | |
289 | } | |
290 | ||
291 | #define for_each_rx(rd, sp) for((rd) = &(sp)->rx_desc[(sp)->rx_new]; \ | |
292 | !((rd)->rdma.cntinfo & HPCDMA_OWN); \ | |
293 | (rd) = &(sp)->rx_desc[(sp)->rx_new]) | |
294 | ||
295 | static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp, | |
296 | struct hpc3_ethregs *hregs, | |
297 | struct sgiseeq_regs *sregs) | |
298 | { | |
299 | struct sgiseeq_rx_desc *rd; | |
a4d4d518 | 300 | struct sk_buff *skb = NULL; |
1da177e4 | 301 | unsigned char pkt_status; |
a4d4d518 | 302 | unsigned char *pkt_pointer = NULL; |
1da177e4 LT |
303 | int len = 0; |
304 | unsigned int orig_end = PREV_RX(sp->rx_new); | |
305 | ||
306 | /* Service every received packet. */ | |
307 | for_each_rx(rd, sp) { | |
308 | len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3; | |
309 | pkt_pointer = (unsigned char *)(long)rd->buf_vaddr; | |
310 | pkt_status = pkt_pointer[len + 2]; | |
311 | ||
312 | if (pkt_status & SEEQ_RSTAT_FIG) { | |
313 | /* Packet is OK. */ | |
314 | skb = dev_alloc_skb(len + 2); | |
315 | ||
316 | if (skb) { | |
1da177e4 LT |
317 | skb_reserve(skb, 2); |
318 | skb_put(skb, len); | |
319 | ||
320 | /* Copy out of kseg1 to avoid silly cache flush. */ | |
8c7b7faa | 321 | skb_copy_to_linear_data(skb, pkt_pointer + 2, len); |
1da177e4 LT |
322 | skb->protocol = eth_type_trans(skb, dev); |
323 | ||
324 | /* We don't want to receive our own packets */ | |
325 | if (memcmp(eth_hdr(skb)->h_source, dev->dev_addr, ETH_ALEN)) { | |
326 | netif_rx(skb); | |
327 | dev->last_rx = jiffies; | |
09f75cd7 JG |
328 | dev->stats.rx_packets++; |
329 | dev->stats.rx_bytes += len; | |
1da177e4 LT |
330 | } else { |
331 | /* Silently drop my own packets */ | |
332 | dev_kfree_skb_irq(skb); | |
333 | } | |
334 | } else { | |
335 | printk (KERN_NOTICE "%s: Memory squeeze, deferring packet.\n", | |
336 | dev->name); | |
09f75cd7 | 337 | dev->stats.rx_dropped++; |
1da177e4 LT |
338 | } |
339 | } else { | |
09f75cd7 | 340 | record_rx_errors(dev, pkt_status); |
1da177e4 LT |
341 | } |
342 | ||
343 | /* Return the entry to the ring pool. */ | |
344 | rd->rdma.cntinfo = RCNTINFO_INIT; | |
345 | sp->rx_new = NEXT_RX(sp->rx_new); | |
346 | } | |
347 | sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR); | |
348 | sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR; | |
349 | rx_maybe_restart(sp, hregs, sregs); | |
350 | } | |
351 | ||
352 | static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp, | |
353 | struct sgiseeq_regs *sregs) | |
354 | { | |
355 | if (sp->is_edlc) { | |
356 | sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT); | |
357 | sregs->rw.wregs.control = sp->control; | |
358 | } | |
359 | } | |
360 | ||
361 | static inline void kick_tx(struct sgiseeq_tx_desc *td, | |
362 | struct hpc3_ethregs *hregs) | |
363 | { | |
364 | /* If the HPC aint doin nothin, and there are more packets | |
365 | * with ETXD cleared and XIU set we must make very certain | |
366 | * that we restart the HPC else we risk locking up the | |
367 | * adapter. The following code is only safe iff the HPCDMA | |
368 | * is not active! | |
369 | */ | |
370 | while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) == | |
371 | (HPCDMA_XIU | HPCDMA_ETXD)) | |
372 | td = (struct sgiseeq_tx_desc *)(long) CKSEG1ADDR(td->tdma.pnext); | |
373 | if (td->tdma.cntinfo & HPCDMA_XIU) { | |
374 | hregs->tx_ndptr = CPHYSADDR(td); | |
375 | hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; | |
376 | } | |
377 | } | |
378 | ||
379 | static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp, | |
380 | struct hpc3_ethregs *hregs, | |
381 | struct sgiseeq_regs *sregs) | |
382 | { | |
383 | struct sgiseeq_tx_desc *td; | |
384 | unsigned long status = hregs->tx_ctrl; | |
385 | int j; | |
386 | ||
387 | tx_maybe_reset_collisions(sp, sregs); | |
388 | ||
389 | if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) { | |
390 | /* Oops, HPC detected some sort of error. */ | |
391 | if (status & SEEQ_TSTAT_R16) | |
09f75cd7 | 392 | dev->stats.tx_aborted_errors++; |
1da177e4 | 393 | if (status & SEEQ_TSTAT_UFLOW) |
09f75cd7 | 394 | dev->stats.tx_fifo_errors++; |
1da177e4 | 395 | if (status & SEEQ_TSTAT_LCLS) |
09f75cd7 | 396 | dev->stats.collisions++; |
1da177e4 LT |
397 | } |
398 | ||
399 | /* Ack 'em... */ | |
400 | for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) { | |
401 | td = &sp->tx_desc[j]; | |
402 | ||
403 | if (!(td->tdma.cntinfo & (HPCDMA_XIU))) | |
404 | break; | |
405 | if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) { | |
406 | if (!(status & HPC3_ETXCTRL_ACTIVE)) { | |
407 | hregs->tx_ndptr = CPHYSADDR(td); | |
408 | hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; | |
409 | } | |
410 | break; | |
411 | } | |
09f75cd7 | 412 | dev->stats.tx_packets++; |
1da177e4 LT |
413 | sp->tx_old = NEXT_TX(sp->tx_old); |
414 | td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE); | |
415 | td->tdma.cntinfo |= HPCDMA_EOX; | |
416 | } | |
417 | } | |
418 | ||
7d12e780 | 419 | static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id) |
1da177e4 LT |
420 | { |
421 | struct net_device *dev = (struct net_device *) dev_id; | |
422 | struct sgiseeq_private *sp = netdev_priv(dev); | |
423 | struct hpc3_ethregs *hregs = sp->hregs; | |
424 | struct sgiseeq_regs *sregs = sp->sregs; | |
425 | ||
426 | spin_lock(&sp->tx_lock); | |
427 | ||
428 | /* Ack the IRQ and set software state. */ | |
302a5c4b | 429 | hregs->reset = HPC3_ERST_CLRIRQ; |
1da177e4 LT |
430 | |
431 | /* Always check for received packets. */ | |
432 | sgiseeq_rx(dev, sp, hregs, sregs); | |
433 | ||
434 | /* Only check for tx acks if we have something queued. */ | |
435 | if (sp->tx_old != sp->tx_new) | |
436 | sgiseeq_tx(dev, sp, hregs, sregs); | |
437 | ||
438 | if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) { | |
439 | netif_wake_queue(dev); | |
440 | } | |
441 | spin_unlock(&sp->tx_lock); | |
442 | ||
443 | return IRQ_HANDLED; | |
444 | } | |
445 | ||
446 | static int sgiseeq_open(struct net_device *dev) | |
447 | { | |
448 | struct sgiseeq_private *sp = netdev_priv(dev); | |
449 | struct sgiseeq_regs *sregs = sp->sregs; | |
450 | unsigned int irq = dev->irq; | |
451 | int err; | |
452 | ||
453 | if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) { | |
454 | printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq); | |
455 | err = -EAGAIN; | |
456 | } | |
457 | ||
458 | err = init_seeq(dev, sp, sregs); | |
459 | if (err) | |
460 | goto out_free_irq; | |
461 | ||
462 | netif_start_queue(dev); | |
463 | ||
464 | return 0; | |
465 | ||
466 | out_free_irq: | |
467 | free_irq(irq, dev); | |
468 | ||
469 | return err; | |
470 | } | |
471 | ||
472 | static int sgiseeq_close(struct net_device *dev) | |
473 | { | |
474 | struct sgiseeq_private *sp = netdev_priv(dev); | |
475 | struct sgiseeq_regs *sregs = sp->sregs; | |
2891439e | 476 | unsigned int irq = dev->irq; |
1da177e4 LT |
477 | |
478 | netif_stop_queue(dev); | |
479 | ||
480 | /* Shutdown the Seeq. */ | |
481 | reset_hpc3_and_seeq(sp->hregs, sregs); | |
2891439e | 482 | free_irq(irq, dev); |
1da177e4 LT |
483 | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static inline int sgiseeq_reset(struct net_device *dev) | |
488 | { | |
489 | struct sgiseeq_private *sp = netdev_priv(dev); | |
490 | struct sgiseeq_regs *sregs = sp->sregs; | |
491 | int err; | |
492 | ||
493 | err = init_seeq(dev, sp, sregs); | |
494 | if (err) | |
495 | return err; | |
496 | ||
497 | dev->trans_start = jiffies; | |
498 | netif_wake_queue(dev); | |
499 | ||
500 | return 0; | |
501 | } | |
502 | ||
1da177e4 LT |
503 | static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev) |
504 | { | |
505 | struct sgiseeq_private *sp = netdev_priv(dev); | |
506 | struct hpc3_ethregs *hregs = sp->hregs; | |
507 | unsigned long flags; | |
508 | struct sgiseeq_tx_desc *td; | |
509 | int skblen, len, entry; | |
510 | ||
511 | spin_lock_irqsave(&sp->tx_lock, flags); | |
512 | ||
513 | /* Setup... */ | |
514 | skblen = skb->len; | |
515 | len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen; | |
09f75cd7 | 516 | dev->stats.tx_bytes += len; |
1da177e4 LT |
517 | entry = sp->tx_new; |
518 | td = &sp->tx_desc[entry]; | |
519 | ||
520 | /* Create entry. There are so many races with adding a new | |
521 | * descriptor to the chain: | |
522 | * 1) Assume that the HPC is off processing a DMA chain while | |
523 | * we are changing all of the following. | |
524 | * 2) Do no allow the HPC to look at a new descriptor until | |
525 | * we have completely set up it's state. This means, do | |
526 | * not clear HPCDMA_EOX in the current last descritptor | |
527 | * until the one we are adding looks consistent and could | |
528 | * be processes right now. | |
529 | * 3) The tx interrupt code must notice when we've added a new | |
530 | * entry and the HPC got to the end of the chain before we | |
531 | * added this new entry and restarted it. | |
532 | */ | |
d626f62b | 533 | skb_copy_from_linear_data(skb, (char *)(long)td->buf_vaddr, skblen); |
1da177e4 LT |
534 | if (len != skblen) |
535 | memset((char *)(long)td->buf_vaddr + skb->len, 0, len-skblen); | |
536 | td->tdma.cntinfo = (len & HPCDMA_BCNT) | | |
537 | HPCDMA_XIU | HPCDMA_EOXP | HPCDMA_XIE | HPCDMA_EOX; | |
538 | if (sp->tx_old != sp->tx_new) { | |
539 | struct sgiseeq_tx_desc *backend; | |
540 | ||
541 | backend = &sp->tx_desc[PREV_TX(sp->tx_new)]; | |
542 | backend->tdma.cntinfo &= ~HPCDMA_EOX; | |
543 | } | |
544 | sp->tx_new = NEXT_TX(sp->tx_new); /* Advance. */ | |
545 | ||
546 | /* Maybe kick the HPC back into motion. */ | |
547 | if (!(hregs->tx_ctrl & HPC3_ETXCTRL_ACTIVE)) | |
548 | kick_tx(&sp->tx_desc[sp->tx_old], hregs); | |
549 | ||
550 | dev->trans_start = jiffies; | |
551 | dev_kfree_skb(skb); | |
552 | ||
553 | if (!TX_BUFFS_AVAIL(sp)) | |
554 | netif_stop_queue(dev); | |
555 | spin_unlock_irqrestore(&sp->tx_lock, flags); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | ||
560 | static void timeout(struct net_device *dev) | |
561 | { | |
562 | printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name); | |
563 | sgiseeq_reset(dev); | |
564 | ||
565 | dev->trans_start = jiffies; | |
566 | netif_wake_queue(dev); | |
567 | } | |
568 | ||
1da177e4 LT |
569 | static void sgiseeq_set_multicast(struct net_device *dev) |
570 | { | |
571 | struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv; | |
572 | unsigned char oldmode = sp->mode; | |
573 | ||
574 | if(dev->flags & IFF_PROMISC) | |
575 | sp->mode = SEEQ_RCMD_RANY; | |
576 | else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count) | |
577 | sp->mode = SEEQ_RCMD_RBMCAST; | |
578 | else | |
579 | sp->mode = SEEQ_RCMD_RBCAST; | |
580 | ||
581 | /* XXX I know this sucks, but is there a better way to reprogram | |
582 | * XXX the receiver? At least, this shouldn't happen too often. | |
583 | */ | |
584 | ||
585 | if (oldmode != sp->mode) | |
586 | sgiseeq_reset(dev); | |
587 | } | |
588 | ||
589 | static inline void setup_tx_ring(struct sgiseeq_tx_desc *buf, int nbufs) | |
590 | { | |
591 | int i = 0; | |
592 | ||
593 | while (i < (nbufs - 1)) { | |
594 | buf[i].tdma.pnext = CPHYSADDR(buf + i + 1); | |
595 | buf[i].tdma.pbuf = 0; | |
596 | i++; | |
597 | } | |
598 | buf[i].tdma.pnext = CPHYSADDR(buf); | |
599 | } | |
600 | ||
601 | static inline void setup_rx_ring(struct sgiseeq_rx_desc *buf, int nbufs) | |
602 | { | |
603 | int i = 0; | |
604 | ||
605 | while (i < (nbufs - 1)) { | |
606 | buf[i].rdma.pnext = CPHYSADDR(buf + i + 1); | |
607 | buf[i].rdma.pbuf = 0; | |
608 | i++; | |
609 | } | |
610 | buf[i].rdma.pbuf = 0; | |
611 | buf[i].rdma.pnext = CPHYSADDR(buf); | |
612 | } | |
613 | ||
614 | #define ALIGNED(x) ((((unsigned long)(x)) + 0xf) & ~(0xf)) | |
615 | ||
df9f5408 | 616 | static int __init sgiseeq_probe(struct platform_device *pdev) |
1da177e4 | 617 | { |
df9f5408 RB |
618 | struct sgiseeq_platform_data *pd = pdev->dev.platform_data; |
619 | struct hpc3_regs *hpcregs = pd->hpc; | |
1da177e4 | 620 | struct sgiseeq_init_block *sr; |
df9f5408 | 621 | unsigned int irq = pd->irq; |
1da177e4 LT |
622 | struct sgiseeq_private *sp; |
623 | struct net_device *dev; | |
624 | int err, i; | |
0795af57 | 625 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
626 | |
627 | dev = alloc_etherdev(sizeof (struct sgiseeq_private)); | |
628 | if (!dev) { | |
629 | printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n"); | |
630 | err = -ENOMEM; | |
631 | goto err_out; | |
632 | } | |
df9f5408 RB |
633 | |
634 | platform_set_drvdata(pdev, dev); | |
1da177e4 LT |
635 | sp = netdev_priv(dev); |
636 | ||
637 | /* Make private data page aligned */ | |
99cd149e RB |
638 | sr = dma_alloc_coherent(&pdev->dev, sizeof(*sp->srings), |
639 | &sp->srings_dma, GFP_KERNEL); | |
1da177e4 LT |
640 | if (!sr) { |
641 | printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n"); | |
642 | err = -ENOMEM; | |
643 | goto err_out_free_dev; | |
644 | } | |
645 | sp->srings = sr; | |
99cd149e RB |
646 | sp->rx_desc = sp->srings->rxvector; |
647 | sp->tx_desc = sp->srings->txvector; | |
648 | ||
649 | /* A couple calculations now, saves many cycles later. */ | |
650 | setup_rx_ring(sp->rx_desc, SEEQ_RX_BUFFERS); | |
651 | setup_tx_ring(sp->tx_desc, SEEQ_TX_BUFFERS); | |
1da177e4 | 652 | |
df9f5408 | 653 | memcpy(dev->dev_addr, pd->mac, ETH_ALEN); |
1da177e4 LT |
654 | |
655 | #ifdef DEBUG | |
656 | gpriv = sp; | |
657 | gdev = dev; | |
658 | #endif | |
302a5c4b RB |
659 | sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0]; |
660 | sp->hregs = &hpcregs->ethregs; | |
1da177e4 LT |
661 | sp->name = sgiseeqstr; |
662 | sp->mode = SEEQ_RCMD_RBCAST; | |
663 | ||
78ee5b3c LM |
664 | /* Setup PIO and DMA transfer timing */ |
665 | sp->hregs->pconfig = 0x161; | |
666 | sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | | |
667 | HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; | |
668 | ||
302a5c4b RB |
669 | /* Setup PIO and DMA transfer timing */ |
670 | sp->hregs->pconfig = 0x161; | |
671 | sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | | |
672 | HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; | |
673 | ||
1da177e4 LT |
674 | /* Reset the chip. */ |
675 | hpc3_eth_reset(sp->hregs); | |
676 | ||
677 | sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff); | |
678 | if (sp->is_edlc) | |
679 | sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT | | |
680 | SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT | | |
681 | SEEQ_CTRL_ENCARR; | |
682 | ||
683 | dev->open = sgiseeq_open; | |
684 | dev->stop = sgiseeq_close; | |
685 | dev->hard_start_xmit = sgiseeq_start_xmit; | |
686 | dev->tx_timeout = timeout; | |
687 | dev->watchdog_timeo = (200 * HZ) / 1000; | |
1da177e4 LT |
688 | dev->set_multicast_list = sgiseeq_set_multicast; |
689 | dev->set_mac_address = sgiseeq_set_mac_address; | |
690 | dev->irq = irq; | |
691 | ||
692 | if (register_netdev(dev)) { | |
693 | printk(KERN_ERR "Sgiseeq: Cannot register net device, " | |
694 | "aborting.\n"); | |
695 | err = -ENODEV; | |
696 | goto err_out_free_page; | |
697 | } | |
698 | ||
0795af57 JP |
699 | printk(KERN_INFO "%s: %s %s\n", |
700 | dev->name, sgiseeqstr, print_mac(mac, dev->dev_addr)); | |
1da177e4 | 701 | |
1da177e4 LT |
702 | return 0; |
703 | ||
704 | err_out_free_page: | |
2891439e | 705 | free_page((unsigned long) sp->srings); |
1da177e4 LT |
706 | err_out_free_dev: |
707 | kfree(dev); | |
708 | ||
709 | err_out: | |
710 | return err; | |
711 | } | |
712 | ||
e3efb054 | 713 | static int __exit sgiseeq_remove(struct platform_device *pdev) |
1da177e4 | 714 | { |
df9f5408 RB |
715 | struct net_device *dev = platform_get_drvdata(pdev); |
716 | struct sgiseeq_private *sp = netdev_priv(dev); | |
78ee5b3c | 717 | |
df9f5408 | 718 | unregister_netdev(dev); |
99cd149e RB |
719 | dma_free_coherent(&pdev->dev, sizeof(*sp->srings), sp->srings, |
720 | sp->srings_dma); | |
df9f5408 RB |
721 | free_netdev(dev); |
722 | platform_set_drvdata(pdev, NULL); | |
e3efb054 RB |
723 | |
724 | return 0; | |
1da177e4 LT |
725 | } |
726 | ||
df9f5408 RB |
727 | static struct platform_driver sgiseeq_driver = { |
728 | .probe = sgiseeq_probe, | |
729 | .remove = __devexit_p(sgiseeq_remove), | |
730 | .driver = { | |
731 | .name = "sgiseeq" | |
732 | } | |
733 | }; | |
1da177e4 | 734 | |
df9f5408 RB |
735 | static int __init sgiseeq_module_init(void) |
736 | { | |
737 | if (platform_driver_register(&sgiseeq_driver)) { | |
738 | printk(KERN_ERR "Driver registration failed\n"); | |
739 | return -ENODEV; | |
1da177e4 | 740 | } |
df9f5408 RB |
741 | |
742 | return 0; | |
743 | } | |
744 | ||
745 | static void __exit sgiseeq_module_exit(void) | |
746 | { | |
747 | platform_driver_unregister(&sgiseeq_driver); | |
1da177e4 LT |
748 | } |
749 | ||
df9f5408 RB |
750 | module_init(sgiseeq_module_init); |
751 | module_exit(sgiseeq_module_exit); | |
1da177e4 | 752 | |
302a5c4b RB |
753 | MODULE_DESCRIPTION("SGI Seeq 8003 driver"); |
754 | MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>"); | |
1da177e4 | 755 | MODULE_LICENSE("GPL"); |