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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 | */ | |
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/string.h> |
16 | #include <linux/delay.h> | |
17 | #include <linux/netdevice.h> | |
df9f5408 | 18 | #include <linux/platform_device.h> |
1da177e4 LT |
19 | #include <linux/etherdevice.h> |
20 | #include <linux/skbuff.h> | |
1da177e4 | 21 | |
1da177e4 LT |
22 | #include <asm/sgi/hpc3.h> |
23 | #include <asm/sgi/ip22.h> | |
df9f5408 | 24 | #include <asm/sgi/seeq.h> |
1da177e4 LT |
25 | |
26 | #include "sgiseeq.h" | |
27 | ||
1da177e4 LT |
28 | static char *sgiseeqstr = "SGI Seeq8003"; |
29 | ||
30 | /* | |
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. ;-) | |
38 | */ | |
39 | ||
40 | /* Tune these if we tend to run out often etc. */ | |
41 | #define SEEQ_RX_BUFFERS 16 | |
42 | #define SEEQ_TX_BUFFERS 16 | |
43 | ||
44 | #define PKT_BUF_SZ 1584 | |
45 | ||
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)) | |
50 | ||
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) | |
54 | ||
43831b15 TB |
55 | #define VIRT_TO_DMA(sp, v) ((sp)->srings_dma + \ |
56 | (dma_addr_t)((unsigned long)(v) - \ | |
57 | (unsigned long)((sp)->rx_desc))) | |
58 | ||
43831b15 TB |
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). | |
61 | */ | |
62 | static int rx_copybreak = 100; | |
63 | ||
64 | #define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *)) | |
65 | ||
1da177e4 LT |
66 | struct sgiseeq_rx_desc { |
67 | volatile struct hpc_dma_desc rdma; | |
43831b15 TB |
68 | u8 padding[PAD_SIZE]; |
69 | struct sk_buff *skb; | |
1da177e4 LT |
70 | }; |
71 | ||
72 | struct sgiseeq_tx_desc { | |
73 | volatile struct hpc_dma_desc tdma; | |
43831b15 TB |
74 | u8 padding[PAD_SIZE]; |
75 | struct sk_buff *skb; | |
1da177e4 LT |
76 | }; |
77 | ||
78 | /* | |
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 | |
81 | * some care. | |
82 | */ | |
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]; | |
86 | }; | |
87 | ||
88 | struct sgiseeq_private { | |
89 | struct sgiseeq_init_block *srings; | |
99cd149e | 90 | dma_addr_t srings_dma; |
1da177e4 LT |
91 | |
92 | /* Ptrs to the descriptors in uncached space. */ | |
93 | struct sgiseeq_rx_desc *rx_desc; | |
94 | struct sgiseeq_tx_desc *tx_desc; | |
95 | ||
96 | char *name; | |
97 | struct hpc3_ethregs *hregs; | |
98 | struct sgiseeq_regs *sregs; | |
99 | ||
100 | /* Ring entry counters. */ | |
101 | unsigned int rx_new, tx_new; | |
102 | unsigned int rx_old, tx_old; | |
103 | ||
104 | int is_edlc; | |
105 | unsigned char control; | |
106 | unsigned char mode; | |
107 | ||
1da177e4 LT |
108 | spinlock_t tx_lock; |
109 | }; | |
110 | ||
49b11bc3 TB |
111 | static inline void dma_sync_desc_cpu(struct net_device *dev, void *addr) |
112 | { | |
113 | dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc), | |
114 | DMA_FROM_DEVICE); | |
115 | } | |
116 | ||
117 | static inline void dma_sync_desc_dev(struct net_device *dev, void *addr) | |
118 | { | |
119 | dma_cache_sync(dev->dev.parent, addr, sizeof(struct sgiseeq_rx_desc), | |
120 | DMA_TO_DEVICE); | |
121 | } | |
122 | ||
1da177e4 LT |
123 | static inline void hpc3_eth_reset(struct hpc3_ethregs *hregs) |
124 | { | |
302a5c4b | 125 | hregs->reset = HPC3_ERST_CRESET | HPC3_ERST_CLRIRQ; |
1da177e4 | 126 | udelay(20); |
302a5c4b | 127 | hregs->reset = 0; |
1da177e4 LT |
128 | } |
129 | ||
130 | static inline void reset_hpc3_and_seeq(struct hpc3_ethregs *hregs, | |
131 | struct sgiseeq_regs *sregs) | |
132 | { | |
133 | hregs->rx_ctrl = hregs->tx_ctrl = 0; | |
134 | hpc3_eth_reset(hregs); | |
135 | } | |
136 | ||
137 | #define RSTAT_GO_BITS (SEEQ_RCMD_IGOOD | SEEQ_RCMD_IEOF | SEEQ_RCMD_ISHORT | \ | |
138 | SEEQ_RCMD_IDRIB | SEEQ_RCMD_ICRC) | |
139 | ||
140 | static inline void seeq_go(struct sgiseeq_private *sp, | |
141 | struct hpc3_ethregs *hregs, | |
142 | struct sgiseeq_regs *sregs) | |
143 | { | |
144 | sregs->rstat = sp->mode | RSTAT_GO_BITS; | |
145 | hregs->rx_ctrl = HPC3_ERXCTRL_ACTIVE; | |
146 | } | |
147 | ||
148 | static inline void __sgiseeq_set_mac_address(struct net_device *dev) | |
149 | { | |
150 | struct sgiseeq_private *sp = netdev_priv(dev); | |
151 | struct sgiseeq_regs *sregs = sp->sregs; | |
152 | int i; | |
153 | ||
154 | sregs->tstat = SEEQ_TCMD_RB0; | |
155 | for (i = 0; i < 6; i++) | |
156 | sregs->rw.eth_addr[i] = dev->dev_addr[i]; | |
157 | } | |
158 | ||
159 | static int sgiseeq_set_mac_address(struct net_device *dev, void *addr) | |
160 | { | |
161 | struct sgiseeq_private *sp = netdev_priv(dev); | |
162 | struct sockaddr *sa = addr; | |
163 | ||
164 | memcpy(dev->dev_addr, sa->sa_data, dev->addr_len); | |
165 | ||
166 | spin_lock_irq(&sp->tx_lock); | |
167 | __sgiseeq_set_mac_address(dev); | |
168 | spin_unlock_irq(&sp->tx_lock); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
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)) | |
176 | ||
177 | static int seeq_init_ring(struct net_device *dev) | |
178 | { | |
179 | struct sgiseeq_private *sp = netdev_priv(dev); | |
180 | int i; | |
181 | ||
182 | netif_stop_queue(dev); | |
183 | sp->rx_new = sp->tx_new = 0; | |
184 | sp->rx_old = sp->tx_old = 0; | |
185 | ||
186 | __sgiseeq_set_mac_address(dev); | |
187 | ||
188 | /* Setup tx ring. */ | |
189 | for(i = 0; i < SEEQ_TX_BUFFERS; i++) { | |
1da177e4 | 190 | sp->tx_desc[i].tdma.cntinfo = TCNTINFO_INIT; |
49b11bc3 | 191 | dma_sync_desc_dev(dev, &sp->tx_desc[i]); |
1da177e4 LT |
192 | } |
193 | ||
194 | /* And now the rx ring. */ | |
195 | for (i = 0; i < SEEQ_RX_BUFFERS; i++) { | |
a24a789c | 196 | if (!sp->rx_desc[i].skb) { |
43831b15 TB |
197 | dma_addr_t dma_addr; |
198 | struct sk_buff *skb = netdev_alloc_skb(dev, PKT_BUF_SZ); | |
1da177e4 | 199 | |
43831b15 | 200 | if (skb == NULL) |
1da177e4 | 201 | return -ENOMEM; |
43831b15 TB |
202 | skb_reserve(skb, 2); |
203 | dma_addr = dma_map_single(dev->dev.parent, | |
204 | skb->data - 2, | |
205 | PKT_BUF_SZ, DMA_FROM_DEVICE); | |
206 | sp->rx_desc[i].skb = skb; | |
207 | sp->rx_desc[i].rdma.pbuf = dma_addr; | |
1da177e4 LT |
208 | } |
209 | sp->rx_desc[i].rdma.cntinfo = RCNTINFO_INIT; | |
49b11bc3 | 210 | dma_sync_desc_dev(dev, &sp->rx_desc[i]); |
1da177e4 LT |
211 | } |
212 | sp->rx_desc[i - 1].rdma.cntinfo |= HPCDMA_EOR; | |
49b11bc3 | 213 | dma_sync_desc_dev(dev, &sp->rx_desc[i - 1]); |
1da177e4 LT |
214 | return 0; |
215 | } | |
216 | ||
43831b15 TB |
217 | static void seeq_purge_ring(struct net_device *dev) |
218 | { | |
219 | struct sgiseeq_private *sp = netdev_priv(dev); | |
220 | int i; | |
221 | ||
222 | /* clear tx ring. */ | |
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; | |
227 | } | |
228 | } | |
229 | ||
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; | |
235 | } | |
236 | } | |
237 | } | |
238 | ||
1da177e4 LT |
239 | #ifdef DEBUG |
240 | static struct sgiseeq_private *gpriv; | |
241 | static struct net_device *gdev; | |
242 | ||
a4d4d518 | 243 | static void sgiseeq_dump_rings(void) |
1da177e4 LT |
244 | { |
245 | static int once; | |
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; | |
249 | int i; | |
250 | ||
251 | if (once) | |
252 | return; | |
253 | once++; | |
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, | |
258 | r[i].rdma.pnext); | |
259 | i += 1; | |
260 | printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", | |
261 | i, (&r[i]), r[i].rdma.pbuf, r[i].rdma.cntinfo, | |
262 | r[i].rdma.pnext); | |
263 | } | |
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, | |
267 | t[i].tdma.pnext); | |
268 | i += 1; | |
269 | printk("-- [%d]: @(%p) [%08x,%08x,%08x]\n", | |
270 | i, (&t[i]), t[i].tdma.pbuf, t[i].tdma.cntinfo, | |
271 | t[i].tdma.pnext); | |
272 | } | |
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); | |
279 | } | |
280 | #endif | |
281 | ||
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) | |
1da177e4 LT |
284 | |
285 | static int init_seeq(struct net_device *dev, struct sgiseeq_private *sp, | |
286 | struct sgiseeq_regs *sregs) | |
287 | { | |
288 | struct hpc3_ethregs *hregs = sp->hregs; | |
289 | int err; | |
290 | ||
291 | reset_hpc3_and_seeq(hregs, sregs); | |
292 | err = seeq_init_ring(dev); | |
293 | if (err) | |
294 | return err; | |
295 | ||
296 | /* Setup to field the proper interrupt types. */ | |
297 | if (sp->is_edlc) { | |
298 | sregs->tstat = TSTAT_INIT_EDLC; | |
299 | sregs->rw.wregs.control = sp->control; | |
300 | sregs->rw.wregs.frame_gap = 0; | |
301 | } else { | |
302 | sregs->tstat = TSTAT_INIT_SEEQ; | |
303 | } | |
304 | ||
43831b15 TB |
305 | hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc); |
306 | hregs->tx_ndptr = VIRT_TO_DMA(sp, sp->tx_desc); | |
1da177e4 LT |
307 | |
308 | seeq_go(sp, hregs, sregs); | |
309 | return 0; | |
310 | } | |
311 | ||
09f75cd7 | 312 | static void record_rx_errors(struct net_device *dev, unsigned char status) |
1da177e4 LT |
313 | { |
314 | if (status & SEEQ_RSTAT_OVERF || | |
315 | status & SEEQ_RSTAT_SFRAME) | |
09f75cd7 | 316 | dev->stats.rx_over_errors++; |
1da177e4 | 317 | if (status & SEEQ_RSTAT_CERROR) |
09f75cd7 | 318 | dev->stats.rx_crc_errors++; |
1da177e4 | 319 | if (status & SEEQ_RSTAT_DERROR) |
09f75cd7 | 320 | dev->stats.rx_frame_errors++; |
1da177e4 | 321 | if (status & SEEQ_RSTAT_REOF) |
09f75cd7 | 322 | dev->stats.rx_errors++; |
1da177e4 LT |
323 | } |
324 | ||
325 | static inline void rx_maybe_restart(struct sgiseeq_private *sp, | |
326 | struct hpc3_ethregs *hregs, | |
327 | struct sgiseeq_regs *sregs) | |
328 | { | |
329 | if (!(hregs->rx_ctrl & HPC3_ERXCTRL_ACTIVE)) { | |
43831b15 | 330 | hregs->rx_ndptr = VIRT_TO_DMA(sp, sp->rx_desc + sp->rx_new); |
1da177e4 LT |
331 | seeq_go(sp, hregs, sregs); |
332 | } | |
333 | } | |
334 | ||
1da177e4 LT |
335 | static inline void sgiseeq_rx(struct net_device *dev, struct sgiseeq_private *sp, |
336 | struct hpc3_ethregs *hregs, | |
337 | struct sgiseeq_regs *sregs) | |
338 | { | |
339 | struct sgiseeq_rx_desc *rd; | |
a4d4d518 | 340 | struct sk_buff *skb = NULL; |
43831b15 | 341 | struct sk_buff *newskb; |
1da177e4 | 342 | unsigned char pkt_status; |
1da177e4 LT |
343 | int len = 0; |
344 | unsigned int orig_end = PREV_RX(sp->rx_new); | |
345 | ||
346 | /* Service every received packet. */ | |
43831b15 | 347 | rd = &sp->rx_desc[sp->rx_new]; |
49b11bc3 | 348 | dma_sync_desc_cpu(dev, rd); |
43831b15 | 349 | while (!(rd->rdma.cntinfo & HPCDMA_OWN)) { |
1da177e4 | 350 | len = PKT_BUF_SZ - (rd->rdma.cntinfo & HPCDMA_BCNT) - 3; |
43831b15 TB |
351 | dma_unmap_single(dev->dev.parent, rd->rdma.pbuf, |
352 | PKT_BUF_SZ, DMA_FROM_DEVICE); | |
353 | pkt_status = rd->skb->data[len]; | |
1da177e4 LT |
354 | if (pkt_status & SEEQ_RSTAT_FIG) { |
355 | /* Packet is OK. */ | |
43831b15 TB |
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) { | |
359 | skb = rd->skb; | |
360 | newskb = netdev_alloc_skb(dev, PKT_BUF_SZ); | |
361 | if (!newskb) { | |
362 | newskb = skb; | |
363 | skb = NULL; | |
364 | goto memory_squeeze; | |
365 | } | |
366 | skb_reserve(newskb, 2); | |
367 | } else { | |
368 | skb = netdev_alloc_skb(dev, len + 2); | |
369 | if (skb) { | |
370 | skb_reserve(skb, 2); | |
371 | skb_copy_to_linear_data(skb, rd->skb->data, len); | |
372 | } | |
373 | newskb = rd->skb; | |
374 | } | |
375 | memory_squeeze: | |
376 | if (skb) { | |
377 | skb_put(skb, len); | |
378 | skb->protocol = eth_type_trans(skb, dev); | |
1da177e4 LT |
379 | netif_rx(skb); |
380 | dev->last_rx = jiffies; | |
09f75cd7 JG |
381 | dev->stats.rx_packets++; |
382 | dev->stats.rx_bytes += len; | |
1da177e4 | 383 | } else { |
43831b15 TB |
384 | printk(KERN_NOTICE "%s: Memory squeeze, deferring packet.\n", |
385 | dev->name); | |
386 | dev->stats.rx_dropped++; | |
1da177e4 LT |
387 | } |
388 | } else { | |
43831b15 TB |
389 | /* Silently drop my own packets */ |
390 | newskb = rd->skb; | |
1da177e4 LT |
391 | } |
392 | } else { | |
09f75cd7 | 393 | record_rx_errors(dev, pkt_status); |
43831b15 | 394 | newskb = rd->skb; |
1da177e4 | 395 | } |
43831b15 TB |
396 | rd->skb = newskb; |
397 | rd->rdma.pbuf = dma_map_single(dev->dev.parent, | |
398 | newskb->data - 2, | |
399 | PKT_BUF_SZ, DMA_FROM_DEVICE); | |
1da177e4 LT |
400 | |
401 | /* Return the entry to the ring pool. */ | |
402 | rd->rdma.cntinfo = RCNTINFO_INIT; | |
403 | sp->rx_new = NEXT_RX(sp->rx_new); | |
49b11bc3 | 404 | dma_sync_desc_dev(dev, rd); |
43831b15 | 405 | rd = &sp->rx_desc[sp->rx_new]; |
49b11bc3 | 406 | dma_sync_desc_cpu(dev, rd); |
1da177e4 | 407 | } |
49b11bc3 | 408 | dma_sync_desc_cpu(dev, &sp->rx_desc[orig_end]); |
1da177e4 | 409 | sp->rx_desc[orig_end].rdma.cntinfo &= ~(HPCDMA_EOR); |
49b11bc3 TB |
410 | dma_sync_desc_dev(dev, &sp->rx_desc[orig_end]); |
411 | dma_sync_desc_cpu(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]); | |
1da177e4 | 412 | sp->rx_desc[PREV_RX(sp->rx_new)].rdma.cntinfo |= HPCDMA_EOR; |
49b11bc3 | 413 | dma_sync_desc_dev(dev, &sp->rx_desc[PREV_RX(sp->rx_new)]); |
1da177e4 LT |
414 | rx_maybe_restart(sp, hregs, sregs); |
415 | } | |
416 | ||
417 | static inline void tx_maybe_reset_collisions(struct sgiseeq_private *sp, | |
418 | struct sgiseeq_regs *sregs) | |
419 | { | |
420 | if (sp->is_edlc) { | |
421 | sregs->rw.wregs.control = sp->control & ~(SEEQ_CTRL_XCNT); | |
422 | sregs->rw.wregs.control = sp->control; | |
423 | } | |
424 | } | |
425 | ||
43831b15 TB |
426 | static inline void kick_tx(struct net_device *dev, |
427 | struct sgiseeq_private *sp, | |
1da177e4 LT |
428 | struct hpc3_ethregs *hregs) |
429 | { | |
43831b15 TB |
430 | struct sgiseeq_tx_desc *td; |
431 | int i = sp->tx_old; | |
432 | ||
1da177e4 LT |
433 | /* If the HPC aint doin nothin, and there are more packets |
434 | * with ETXD cleared and XIU set we must make very certain | |
435 | * that we restart the HPC else we risk locking up the | |
436 | * adapter. The following code is only safe iff the HPCDMA | |
437 | * is not active! | |
438 | */ | |
43831b15 | 439 | td = &sp->tx_desc[i]; |
49b11bc3 | 440 | dma_sync_desc_cpu(dev, td); |
1da177e4 | 441 | while ((td->tdma.cntinfo & (HPCDMA_XIU | HPCDMA_ETXD)) == |
43831b15 TB |
442 | (HPCDMA_XIU | HPCDMA_ETXD)) { |
443 | i = NEXT_TX(i); | |
444 | td = &sp->tx_desc[i]; | |
49b11bc3 | 445 | dma_sync_desc_cpu(dev, td); |
43831b15 | 446 | } |
1da177e4 | 447 | if (td->tdma.cntinfo & HPCDMA_XIU) { |
43831b15 | 448 | hregs->tx_ndptr = VIRT_TO_DMA(sp, td); |
1da177e4 LT |
449 | hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; |
450 | } | |
451 | } | |
452 | ||
453 | static inline void sgiseeq_tx(struct net_device *dev, struct sgiseeq_private *sp, | |
454 | struct hpc3_ethregs *hregs, | |
455 | struct sgiseeq_regs *sregs) | |
456 | { | |
457 | struct sgiseeq_tx_desc *td; | |
458 | unsigned long status = hregs->tx_ctrl; | |
459 | int j; | |
460 | ||
461 | tx_maybe_reset_collisions(sp, sregs); | |
462 | ||
463 | if (!(status & (HPC3_ETXCTRL_ACTIVE | SEEQ_TSTAT_PTRANS))) { | |
464 | /* Oops, HPC detected some sort of error. */ | |
465 | if (status & SEEQ_TSTAT_R16) | |
09f75cd7 | 466 | dev->stats.tx_aborted_errors++; |
1da177e4 | 467 | if (status & SEEQ_TSTAT_UFLOW) |
09f75cd7 | 468 | dev->stats.tx_fifo_errors++; |
1da177e4 | 469 | if (status & SEEQ_TSTAT_LCLS) |
09f75cd7 | 470 | dev->stats.collisions++; |
1da177e4 LT |
471 | } |
472 | ||
473 | /* Ack 'em... */ | |
474 | for (j = sp->tx_old; j != sp->tx_new; j = NEXT_TX(j)) { | |
475 | td = &sp->tx_desc[j]; | |
476 | ||
49b11bc3 | 477 | dma_sync_desc_cpu(dev, td); |
1da177e4 LT |
478 | if (!(td->tdma.cntinfo & (HPCDMA_XIU))) |
479 | break; | |
480 | if (!(td->tdma.cntinfo & (HPCDMA_ETXD))) { | |
481 | if (!(status & HPC3_ETXCTRL_ACTIVE)) { | |
43831b15 | 482 | hregs->tx_ndptr = VIRT_TO_DMA(sp, td); |
1da177e4 LT |
483 | hregs->tx_ctrl = HPC3_ETXCTRL_ACTIVE; |
484 | } | |
485 | break; | |
486 | } | |
09f75cd7 | 487 | dev->stats.tx_packets++; |
1da177e4 LT |
488 | sp->tx_old = NEXT_TX(sp->tx_old); |
489 | td->tdma.cntinfo &= ~(HPCDMA_XIU | HPCDMA_XIE); | |
490 | td->tdma.cntinfo |= HPCDMA_EOX; | |
43831b15 TB |
491 | if (td->skb) { |
492 | dev_kfree_skb_any(td->skb); | |
493 | td->skb = NULL; | |
494 | } | |
49b11bc3 | 495 | dma_sync_desc_dev(dev, td); |
1da177e4 LT |
496 | } |
497 | } | |
498 | ||
7d12e780 | 499 | static irqreturn_t sgiseeq_interrupt(int irq, void *dev_id) |
1da177e4 LT |
500 | { |
501 | struct net_device *dev = (struct net_device *) dev_id; | |
502 | struct sgiseeq_private *sp = netdev_priv(dev); | |
503 | struct hpc3_ethregs *hregs = sp->hregs; | |
504 | struct sgiseeq_regs *sregs = sp->sregs; | |
505 | ||
506 | spin_lock(&sp->tx_lock); | |
507 | ||
508 | /* Ack the IRQ and set software state. */ | |
302a5c4b | 509 | hregs->reset = HPC3_ERST_CLRIRQ; |
1da177e4 LT |
510 | |
511 | /* Always check for received packets. */ | |
512 | sgiseeq_rx(dev, sp, hregs, sregs); | |
513 | ||
514 | /* Only check for tx acks if we have something queued. */ | |
515 | if (sp->tx_old != sp->tx_new) | |
516 | sgiseeq_tx(dev, sp, hregs, sregs); | |
517 | ||
518 | if ((TX_BUFFS_AVAIL(sp) > 0) && netif_queue_stopped(dev)) { | |
519 | netif_wake_queue(dev); | |
520 | } | |
521 | spin_unlock(&sp->tx_lock); | |
522 | ||
523 | return IRQ_HANDLED; | |
524 | } | |
525 | ||
526 | static int sgiseeq_open(struct net_device *dev) | |
527 | { | |
528 | struct sgiseeq_private *sp = netdev_priv(dev); | |
529 | struct sgiseeq_regs *sregs = sp->sregs; | |
530 | unsigned int irq = dev->irq; | |
531 | int err; | |
532 | ||
533 | if (request_irq(irq, sgiseeq_interrupt, 0, sgiseeqstr, dev)) { | |
534 | printk(KERN_ERR "Seeq8003: Can't get irq %d\n", dev->irq); | |
535 | err = -EAGAIN; | |
536 | } | |
537 | ||
538 | err = init_seeq(dev, sp, sregs); | |
539 | if (err) | |
540 | goto out_free_irq; | |
541 | ||
542 | netif_start_queue(dev); | |
543 | ||
544 | return 0; | |
545 | ||
546 | out_free_irq: | |
547 | free_irq(irq, dev); | |
548 | ||
549 | return err; | |
550 | } | |
551 | ||
552 | static int sgiseeq_close(struct net_device *dev) | |
553 | { | |
554 | struct sgiseeq_private *sp = netdev_priv(dev); | |
555 | struct sgiseeq_regs *sregs = sp->sregs; | |
2891439e | 556 | unsigned int irq = dev->irq; |
1da177e4 LT |
557 | |
558 | netif_stop_queue(dev); | |
559 | ||
560 | /* Shutdown the Seeq. */ | |
561 | reset_hpc3_and_seeq(sp->hregs, sregs); | |
2891439e | 562 | free_irq(irq, dev); |
43831b15 | 563 | seeq_purge_ring(dev); |
1da177e4 LT |
564 | |
565 | return 0; | |
566 | } | |
567 | ||
568 | static inline int sgiseeq_reset(struct net_device *dev) | |
569 | { | |
570 | struct sgiseeq_private *sp = netdev_priv(dev); | |
571 | struct sgiseeq_regs *sregs = sp->sregs; | |
572 | int err; | |
573 | ||
574 | err = init_seeq(dev, sp, sregs); | |
575 | if (err) | |
576 | return err; | |
577 | ||
578 | dev->trans_start = jiffies; | |
579 | netif_wake_queue(dev); | |
580 | ||
581 | return 0; | |
582 | } | |
583 | ||
1da177e4 LT |
584 | static int sgiseeq_start_xmit(struct sk_buff *skb, struct net_device *dev) |
585 | { | |
586 | struct sgiseeq_private *sp = netdev_priv(dev); | |
587 | struct hpc3_ethregs *hregs = sp->hregs; | |
588 | unsigned long flags; | |
589 | struct sgiseeq_tx_desc *td; | |
43831b15 | 590 | int len, entry; |
1da177e4 LT |
591 | |
592 | spin_lock_irqsave(&sp->tx_lock, flags); | |
593 | ||
594 | /* Setup... */ | |
43831b15 TB |
595 | len = skb->len; |
596 | if (len < ETH_ZLEN) { | |
597 | if (skb_padto(skb, ETH_ZLEN)) | |
598 | return 0; | |
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 LT |
639 | |
640 | dev->trans_start = jiffies; | |
1da177e4 LT |
641 | |
642 | if (!TX_BUFFS_AVAIL(sp)) | |
643 | netif_stop_queue(dev); | |
644 | spin_unlock_irqrestore(&sp->tx_lock, flags); | |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
649 | static void timeout(struct net_device *dev) | |
650 | { | |
651 | printk(KERN_NOTICE "%s: transmit timed out, resetting\n", dev->name); | |
652 | sgiseeq_reset(dev); | |
653 | ||
654 | dev->trans_start = jiffies; | |
655 | netif_wake_queue(dev); | |
656 | } | |
657 | ||
1da177e4 LT |
658 | static void sgiseeq_set_multicast(struct net_device *dev) |
659 | { | |
660 | struct sgiseeq_private *sp = (struct sgiseeq_private *) dev->priv; | |
661 | unsigned char oldmode = sp->mode; | |
662 | ||
663 | if(dev->flags & IFF_PROMISC) | |
664 | sp->mode = SEEQ_RCMD_RANY; | |
665 | else if ((dev->flags & IFF_ALLMULTI) || dev->mc_count) | |
666 | sp->mode = SEEQ_RCMD_RBMCAST; | |
667 | else | |
668 | sp->mode = SEEQ_RCMD_RBCAST; | |
669 | ||
670 | /* XXX I know this sucks, but is there a better way to reprogram | |
671 | * XXX the receiver? At least, this shouldn't happen too often. | |
672 | */ | |
673 | ||
674 | if (oldmode != sp->mode) | |
675 | sgiseeq_reset(dev); | |
676 | } | |
677 | ||
43831b15 TB |
678 | static inline void setup_tx_ring(struct net_device *dev, |
679 | struct sgiseeq_tx_desc *buf, | |
680 | int nbufs) | |
1da177e4 | 681 | { |
43831b15 | 682 | struct sgiseeq_private *sp = netdev_priv(dev); |
1da177e4 LT |
683 | int i = 0; |
684 | ||
685 | while (i < (nbufs - 1)) { | |
43831b15 | 686 | buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf + i + 1); |
1da177e4 | 687 | buf[i].tdma.pbuf = 0; |
49b11bc3 | 688 | dma_sync_desc_dev(dev, &buf[i]); |
1da177e4 LT |
689 | i++; |
690 | } | |
43831b15 | 691 | buf[i].tdma.pnext = VIRT_TO_DMA(sp, buf); |
49b11bc3 | 692 | dma_sync_desc_dev(dev, &buf[i]); |
1da177e4 LT |
693 | } |
694 | ||
43831b15 TB |
695 | static inline void setup_rx_ring(struct net_device *dev, |
696 | struct sgiseeq_rx_desc *buf, | |
697 | int nbufs) | |
1da177e4 | 698 | { |
43831b15 | 699 | struct sgiseeq_private *sp = netdev_priv(dev); |
1da177e4 LT |
700 | int i = 0; |
701 | ||
702 | while (i < (nbufs - 1)) { | |
43831b15 | 703 | buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf + i + 1); |
1da177e4 | 704 | buf[i].rdma.pbuf = 0; |
49b11bc3 | 705 | dma_sync_desc_dev(dev, &buf[i]); |
1da177e4 LT |
706 | i++; |
707 | } | |
708 | buf[i].rdma.pbuf = 0; | |
43831b15 | 709 | buf[i].rdma.pnext = VIRT_TO_DMA(sp, buf); |
49b11bc3 | 710 | dma_sync_desc_dev(dev, &buf[i]); |
1da177e4 LT |
711 | } |
712 | ||
df9f5408 | 713 | static int __init sgiseeq_probe(struct platform_device *pdev) |
1da177e4 | 714 | { |
df9f5408 RB |
715 | struct sgiseeq_platform_data *pd = pdev->dev.platform_data; |
716 | struct hpc3_regs *hpcregs = pd->hpc; | |
1da177e4 | 717 | struct sgiseeq_init_block *sr; |
df9f5408 | 718 | unsigned int irq = pd->irq; |
1da177e4 LT |
719 | struct sgiseeq_private *sp; |
720 | struct net_device *dev; | |
43831b15 | 721 | int err; |
0795af57 | 722 | DECLARE_MAC_BUF(mac); |
1da177e4 LT |
723 | |
724 | dev = alloc_etherdev(sizeof (struct sgiseeq_private)); | |
725 | if (!dev) { | |
726 | printk(KERN_ERR "Sgiseeq: Etherdev alloc failed, aborting.\n"); | |
727 | err = -ENOMEM; | |
728 | goto err_out; | |
729 | } | |
df9f5408 RB |
730 | |
731 | platform_set_drvdata(pdev, dev); | |
1da177e4 LT |
732 | sp = netdev_priv(dev); |
733 | ||
734 | /* Make private data page aligned */ | |
43831b15 | 735 | sr = dma_alloc_noncoherent(&pdev->dev, sizeof(*sp->srings), |
99cd149e | 736 | &sp->srings_dma, GFP_KERNEL); |
1da177e4 LT |
737 | if (!sr) { |
738 | printk(KERN_ERR "Sgiseeq: Page alloc failed, aborting.\n"); | |
739 | err = -ENOMEM; | |
740 | goto err_out_free_dev; | |
741 | } | |
742 | sp->srings = sr; | |
99cd149e RB |
743 | sp->rx_desc = sp->srings->rxvector; |
744 | sp->tx_desc = sp->srings->txvector; | |
745 | ||
746 | /* A couple calculations now, saves many cycles later. */ | |
43831b15 TB |
747 | setup_rx_ring(dev, sp->rx_desc, SEEQ_RX_BUFFERS); |
748 | setup_tx_ring(dev, sp->tx_desc, SEEQ_TX_BUFFERS); | |
1da177e4 | 749 | |
df9f5408 | 750 | memcpy(dev->dev_addr, pd->mac, ETH_ALEN); |
1da177e4 LT |
751 | |
752 | #ifdef DEBUG | |
753 | gpriv = sp; | |
754 | gdev = dev; | |
755 | #endif | |
302a5c4b RB |
756 | sp->sregs = (struct sgiseeq_regs *) &hpcregs->eth_ext[0]; |
757 | sp->hregs = &hpcregs->ethregs; | |
1da177e4 LT |
758 | sp->name = sgiseeqstr; |
759 | sp->mode = SEEQ_RCMD_RBCAST; | |
760 | ||
78ee5b3c LM |
761 | /* Setup PIO and DMA transfer timing */ |
762 | sp->hregs->pconfig = 0x161; | |
763 | sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | | |
764 | HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; | |
765 | ||
302a5c4b RB |
766 | /* Setup PIO and DMA transfer timing */ |
767 | sp->hregs->pconfig = 0x161; | |
768 | sp->hregs->dconfig = HPC3_EDCFG_FIRQ | HPC3_EDCFG_FEOP | | |
769 | HPC3_EDCFG_FRXDC | HPC3_EDCFG_PTO | 0x026; | |
770 | ||
1da177e4 LT |
771 | /* Reset the chip. */ |
772 | hpc3_eth_reset(sp->hregs); | |
773 | ||
774 | sp->is_edlc = !(sp->sregs->rw.rregs.collision_tx[0] & 0xff); | |
775 | if (sp->is_edlc) | |
776 | sp->control = SEEQ_CTRL_XCNT | SEEQ_CTRL_ACCNT | | |
777 | SEEQ_CTRL_SFLAG | SEEQ_CTRL_ESHORT | | |
778 | SEEQ_CTRL_ENCARR; | |
779 | ||
780 | dev->open = sgiseeq_open; | |
781 | dev->stop = sgiseeq_close; | |
782 | dev->hard_start_xmit = sgiseeq_start_xmit; | |
783 | dev->tx_timeout = timeout; | |
784 | dev->watchdog_timeo = (200 * HZ) / 1000; | |
1da177e4 LT |
785 | dev->set_multicast_list = sgiseeq_set_multicast; |
786 | dev->set_mac_address = sgiseeq_set_mac_address; | |
787 | dev->irq = irq; | |
788 | ||
789 | if (register_netdev(dev)) { | |
790 | printk(KERN_ERR "Sgiseeq: Cannot register net device, " | |
791 | "aborting.\n"); | |
792 | err = -ENODEV; | |
793 | goto err_out_free_page; | |
794 | } | |
795 | ||
0795af57 JP |
796 | printk(KERN_INFO "%s: %s %s\n", |
797 | dev->name, sgiseeqstr, print_mac(mac, dev->dev_addr)); | |
1da177e4 | 798 | |
1da177e4 LT |
799 | return 0; |
800 | ||
801 | err_out_free_page: | |
2891439e | 802 | free_page((unsigned long) sp->srings); |
1da177e4 LT |
803 | err_out_free_dev: |
804 | kfree(dev); | |
805 | ||
806 | err_out: | |
807 | return err; | |
808 | } | |
809 | ||
e3efb054 | 810 | static int __exit sgiseeq_remove(struct platform_device *pdev) |
1da177e4 | 811 | { |
df9f5408 RB |
812 | struct net_device *dev = platform_get_drvdata(pdev); |
813 | struct sgiseeq_private *sp = netdev_priv(dev); | |
78ee5b3c | 814 | |
df9f5408 | 815 | unregister_netdev(dev); |
43831b15 TB |
816 | dma_free_noncoherent(&pdev->dev, sizeof(*sp->srings), sp->srings, |
817 | sp->srings_dma); | |
df9f5408 RB |
818 | free_netdev(dev); |
819 | platform_set_drvdata(pdev, NULL); | |
e3efb054 RB |
820 | |
821 | return 0; | |
1da177e4 LT |
822 | } |
823 | ||
df9f5408 RB |
824 | static struct platform_driver sgiseeq_driver = { |
825 | .probe = sgiseeq_probe, | |
826 | .remove = __devexit_p(sgiseeq_remove), | |
827 | .driver = { | |
72abb461 KS |
828 | .name = "sgiseeq", |
829 | .owner = THIS_MODULE, | |
df9f5408 RB |
830 | } |
831 | }; | |
1da177e4 | 832 | |
df9f5408 RB |
833 | static int __init sgiseeq_module_init(void) |
834 | { | |
835 | if (platform_driver_register(&sgiseeq_driver)) { | |
836 | printk(KERN_ERR "Driver registration failed\n"); | |
837 | return -ENODEV; | |
1da177e4 | 838 | } |
df9f5408 RB |
839 | |
840 | return 0; | |
841 | } | |
842 | ||
843 | static void __exit sgiseeq_module_exit(void) | |
844 | { | |
845 | platform_driver_unregister(&sgiseeq_driver); | |
1da177e4 LT |
846 | } |
847 | ||
df9f5408 RB |
848 | module_init(sgiseeq_module_init); |
849 | module_exit(sgiseeq_module_exit); | |
1da177e4 | 850 | |
302a5c4b RB |
851 | MODULE_DESCRIPTION("SGI Seeq 8003 driver"); |
852 | MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>"); | |
1da177e4 | 853 | MODULE_LICENSE("GPL"); |
72abb461 | 854 | MODULE_ALIAS("platform:sgiseeq"); |