Commit | Line | Data |
---|---|---|
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 |
30 | static 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 | */ | |
64 | static int rx_copybreak = 100; | |
65 | ||
66 | #define PAD_SIZE (128 - sizeof(struct hpc_dma_desc) - sizeof(void *)) | |
67 | ||
1da177e4 LT |
68 | struct 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 | ||
74 | struct 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 | */ | |
85 | struct 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 | ||
90 | struct 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 |
113 | static 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 | ||
119 | static 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 |
125 | static 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 | ||
132 | static 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 | ||
142 | static 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 | ||
150 | static 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 | ||
161 | static 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 | ||
179 | static 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 |
219 | static 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 |
242 | static struct sgiseeq_private *gpriv; | |
243 | static struct net_device *gdev; | |
244 | ||
a4d4d518 | 245 | static 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 | |
287 | static 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 | 314 | static 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 | ||
327 | static 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 |
337 | static 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 | } | |
376 | memory_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 | ||
415 | static 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 |
424 | static 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 | ||
451 | static 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 | 497 | static 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 | ||
524 | static 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 | ||
544 | out_free_irq: | |
545 | free_irq(irq, dev); | |
546 | ||
547 | return err; | |
548 | } | |
549 | ||
550 | static 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 | ||
566 | static 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 |
582 | static 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 | ||
647 | static 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 |
656 | static 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 |
676 | static 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 |
693 | static 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 |
711 | static const struct net_device_ops sgiseeq_netdev_ops = { |
712 | .ndo_open = sgiseeq_open, | |
713 | .ndo_stop = sgiseeq_close, | |
714 | .ndo_start_xmit = sgiseeq_start_xmit, | |
715 | .ndo_tx_timeout = timeout, | |
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 | 722 | static 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 | ||
803 | err_out_free_page: | |
2891439e | 804 | free_page((unsigned long) sp->srings); |
1da177e4 | 805 | err_out_free_dev: |
8d879de8 | 806 | free_netdev(dev); |
1da177e4 LT |
807 | |
808 | err_out: | |
809 | return err; | |
810 | } | |
811 | ||
e3efb054 | 812 | static 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 RB |
820 | free_netdev(dev); |
821 | platform_set_drvdata(pdev, NULL); | |
e3efb054 RB |
822 | |
823 | return 0; | |
1da177e4 LT |
824 | } |
825 | ||
df9f5408 RB |
826 | static struct platform_driver sgiseeq_driver = { |
827 | .probe = sgiseeq_probe, | |
fb74c2fc | 828 | .remove = __exit_p(sgiseeq_remove), |
df9f5408 | 829 | .driver = { |
72abb461 KS |
830 | .name = "sgiseeq", |
831 | .owner = THIS_MODULE, | |
df9f5408 RB |
832 | } |
833 | }; | |
1da177e4 | 834 | |
db62f684 | 835 | module_platform_driver(sgiseeq_driver); |
1da177e4 | 836 | |
302a5c4b RB |
837 | MODULE_DESCRIPTION("SGI Seeq 8003 driver"); |
838 | MODULE_AUTHOR("Linux/MIPS Mailing List <linux-mips@linux-mips.org>"); | |
1da177e4 | 839 | MODULE_LICENSE("GPL"); |
72abb461 | 840 | MODULE_ALIAS("platform:sgiseeq"); |